mirror of
https://github.com/samba-team/samba.git
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f85f4ce9cc
* Added support for accept4() * Added support for OpenBSD * Fixed sendto() with UDP and a connected socket * Fixed AF_RAWLINK sockets Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org> Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org> Autobuild-Date(master): Fri May 20 13:58:37 CEST 2016 on sn-devel-144
5349 lines
115 KiB
C
5349 lines
115 KiB
C
/*
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* Copyright (c) 2005-2008 Jelmer Vernooij <jelmer@samba.org>
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* Copyright (C) 2006-2014 Stefan Metzmacher <metze@samba.org>
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* Copyright (C) 2013-2014 Andreas Schneider <asn@samba.org>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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Socket wrapper library. Passes all socket communication over
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unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
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is set.
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#ifdef HAVE_SYS_FILIO_H
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#include <sys/filio.h>
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#endif
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#ifdef HAVE_SYS_SIGNALFD_H
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#include <sys/signalfd.h>
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#endif
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#ifdef HAVE_SYS_EVENTFD_H
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#include <sys/eventfd.h>
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#endif
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#ifdef HAVE_SYS_TIMERFD_H
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#include <sys/timerfd.h>
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#endif
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#include <sys/uio.h>
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#include <errno.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <unistd.h>
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#ifdef HAVE_GNU_LIB_NAMES_H
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#include <gnu/lib-names.h>
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#endif
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#ifdef HAVE_RPC_RPC_H
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#include <rpc/rpc.h>
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#endif
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enum swrap_dbglvl_e {
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SWRAP_LOG_ERROR = 0,
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SWRAP_LOG_WARN,
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SWRAP_LOG_DEBUG,
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SWRAP_LOG_TRACE
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};
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/* GCC have printf type attribute check. */
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#ifdef HAVE_FUNCTION_ATTRIBUTE_FORMAT
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#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
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#else
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#define PRINTF_ATTRIBUTE(a,b)
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#endif /* HAVE_FUNCTION_ATTRIBUTE_FORMAT */
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|
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#ifdef HAVE_DESTRUCTOR_ATTRIBUTE
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#define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor))
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#else
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#define DESTRUCTOR_ATTRIBUTE
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#endif
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#ifdef HAVE_ADDRESS_SANITIZER_ATTRIBUTE
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#define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE __attribute__((no_sanitize_address))
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#else
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#define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
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#endif
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#ifdef HAVE_GCC_THREAD_LOCAL_STORAGE
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# define SWRAP_THREAD __thread
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#else
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# define SWRAP_THREAD
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#endif
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|
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#ifndef MIN
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#define MIN(a,b) ((a)<(b)?(a):(b))
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#endif
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#ifndef ZERO_STRUCT
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#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
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#endif
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|
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#ifndef ZERO_STRUCTP
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#define ZERO_STRUCTP(x) do { \
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if ((x) != NULL) \
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memset((char *)(x), 0, sizeof(*(x))); \
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} while(0)
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#endif
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#ifndef discard_const
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#define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
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#endif
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#ifndef discard_const_p
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#define discard_const_p(type, ptr) ((type *)discard_const(ptr))
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#endif
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#ifdef IPV6_PKTINFO
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# ifndef IPV6_RECVPKTINFO
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# define IPV6_RECVPKTINFO IPV6_PKTINFO
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# endif /* IPV6_RECVPKTINFO */
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#endif /* IPV6_PKTINFO */
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/*
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* On BSD IP_PKTINFO has a different name because during
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* the time when they implemented it, there was no RFC.
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* The name for IPv6 is the same as on Linux.
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*/
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#ifndef IP_PKTINFO
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# ifdef IP_RECVDSTADDR
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# define IP_PKTINFO IP_RECVDSTADDR
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# endif
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#endif
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#define SWRAP_DLIST_ADD(list,item) do { \
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if (!(list)) { \
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(item)->prev = NULL; \
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(item)->next = NULL; \
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(list) = (item); \
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} else { \
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(item)->prev = NULL; \
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(item)->next = (list); \
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(list)->prev = (item); \
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(list) = (item); \
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} \
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} while (0)
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#define SWRAP_DLIST_REMOVE(list,item) do { \
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if ((list) == (item)) { \
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(list) = (item)->next; \
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if (list) { \
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(list)->prev = NULL; \
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} \
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} else { \
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if ((item)->prev) { \
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(item)->prev->next = (item)->next; \
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} \
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if ((item)->next) { \
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(item)->next->prev = (item)->prev; \
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} \
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} \
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(item)->prev = NULL; \
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(item)->next = NULL; \
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} while (0)
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#if defined(HAVE_GETTIMEOFDAY_TZ) || defined(HAVE_GETTIMEOFDAY_TZ_VOID)
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#define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
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#else
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#define swrapGetTimeOfDay(tval) gettimeofday(tval)
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#endif
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/* we need to use a very terse format here as IRIX 6.4 silently
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truncates names to 16 chars, so if we use a longer name then we
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can't tell which port a packet came from with recvfrom()
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with this format we have 8 chars left for the directory name
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*/
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#define SOCKET_FORMAT "%c%02X%04X"
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#define SOCKET_TYPE_CHAR_TCP 'T'
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#define SOCKET_TYPE_CHAR_UDP 'U'
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#define SOCKET_TYPE_CHAR_TCP_V6 'X'
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#define SOCKET_TYPE_CHAR_UDP_V6 'Y'
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/*
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* Set the packet MTU to 1500 bytes for stream sockets to make it it easier to
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* format PCAP capture files (as the caller will simply continue from here).
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*/
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#define SOCKET_WRAPPER_MTU_DEFAULT 1500
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#define SOCKET_WRAPPER_MTU_MIN 512
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#define SOCKET_WRAPPER_MTU_MAX 32768
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#define SOCKET_MAX_SOCKETS 1024
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/* This limit is to avoid broadcast sendto() needing to stat too many
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* files. It may be raised (with a performance cost) to up to 254
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* without changing the format above */
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#define MAX_WRAPPED_INTERFACES 40
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struct swrap_address {
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socklen_t sa_socklen;
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union {
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struct sockaddr s;
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struct sockaddr_in in;
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#ifdef HAVE_IPV6
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struct sockaddr_in6 in6;
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#endif
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struct sockaddr_un un;
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struct sockaddr_storage ss;
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} sa;
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};
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struct socket_info_fd {
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struct socket_info_fd *prev, *next;
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int fd;
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};
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struct socket_info
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{
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struct socket_info_fd *fds;
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int family;
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int type;
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int protocol;
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int bound;
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int bcast;
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int is_server;
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int connected;
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int defer_connect;
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int pktinfo;
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int tcp_nodelay;
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/* The unix path so we can unlink it on close() */
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struct sockaddr_un un_addr;
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struct swrap_address bindname;
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struct swrap_address myname;
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struct swrap_address peername;
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struct {
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unsigned long pck_snd;
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unsigned long pck_rcv;
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} io;
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struct socket_info *prev, *next;
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};
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/*
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* File descriptors are shared between threads so we should share socket
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* information too.
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*/
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struct socket_info *sockets;
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/* Function prototypes */
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bool socket_wrapper_enabled(void);
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void swrap_destructor(void) DESTRUCTOR_ATTRIBUTE;
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#ifdef NDEBUG
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# define SWRAP_LOG(...)
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#else
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static void swrap_log(enum swrap_dbglvl_e dbglvl, const char *func, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
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# define SWRAP_LOG(dbglvl, ...) swrap_log((dbglvl), __func__, __VA_ARGS__)
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static void swrap_log(enum swrap_dbglvl_e dbglvl,
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const char *func,
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const char *format, ...)
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{
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char buffer[1024];
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va_list va;
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const char *d;
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unsigned int lvl = 0;
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d = getenv("SOCKET_WRAPPER_DEBUGLEVEL");
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if (d != NULL) {
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lvl = atoi(d);
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}
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va_start(va, format);
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vsnprintf(buffer, sizeof(buffer), format, va);
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va_end(va);
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if (lvl >= dbglvl) {
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switch (dbglvl) {
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case SWRAP_LOG_ERROR:
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fprintf(stderr,
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"SWRAP_ERROR(%d) - %s: %s\n",
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(int)getpid(), func, buffer);
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break;
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case SWRAP_LOG_WARN:
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fprintf(stderr,
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"SWRAP_WARN(%d) - %s: %s\n",
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(int)getpid(), func, buffer);
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break;
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case SWRAP_LOG_DEBUG:
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fprintf(stderr,
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"SWRAP_DEBUG(%d) - %s: %s\n",
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(int)getpid(), func, buffer);
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break;
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case SWRAP_LOG_TRACE:
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fprintf(stderr,
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"SWRAP_TRACE(%d) - %s: %s\n",
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(int)getpid(), func, buffer);
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break;
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}
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}
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}
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#endif
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/*********************************************************
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* SWRAP LOADING LIBC FUNCTIONS
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*********************************************************/
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#include <dlfcn.h>
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struct swrap_libc_fns {
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#ifdef HAVE_ACCEPT4
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int (*libc_accept4)(int sockfd,
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struct sockaddr *addr,
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socklen_t *addrlen,
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int flags);
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#else
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int (*libc_accept)(int sockfd,
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struct sockaddr *addr,
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socklen_t *addrlen);
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#endif
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int (*libc_bind)(int sockfd,
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const struct sockaddr *addr,
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socklen_t addrlen);
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int (*libc_close)(int fd);
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int (*libc_connect)(int sockfd,
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const struct sockaddr *addr,
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socklen_t addrlen);
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int (*libc_dup)(int fd);
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int (*libc_dup2)(int oldfd, int newfd);
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int (*libc_fcntl)(int fd, int cmd, ...);
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FILE *(*libc_fopen)(const char *name, const char *mode);
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#ifdef HAVE_EVENTFD
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int (*libc_eventfd)(int count, int flags);
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#endif
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int (*libc_getpeername)(int sockfd,
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struct sockaddr *addr,
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socklen_t *addrlen);
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int (*libc_getsockname)(int sockfd,
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struct sockaddr *addr,
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socklen_t *addrlen);
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int (*libc_getsockopt)(int sockfd,
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int level,
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int optname,
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void *optval,
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socklen_t *optlen);
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int (*libc_ioctl)(int d, unsigned long int request, ...);
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int (*libc_listen)(int sockfd, int backlog);
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int (*libc_open)(const char *pathname, int flags, mode_t mode);
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int (*libc_pipe)(int pipefd[2]);
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int (*libc_read)(int fd, void *buf, size_t count);
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ssize_t (*libc_readv)(int fd, const struct iovec *iov, int iovcnt);
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int (*libc_recv)(int sockfd, void *buf, size_t len, int flags);
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int (*libc_recvfrom)(int sockfd,
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void *buf,
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size_t len,
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int flags,
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struct sockaddr *src_addr,
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socklen_t *addrlen);
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int (*libc_recvmsg)(int sockfd, const struct msghdr *msg, int flags);
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int (*libc_send)(int sockfd, const void *buf, size_t len, int flags);
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int (*libc_sendmsg)(int sockfd, const struct msghdr *msg, int flags);
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int (*libc_sendto)(int sockfd,
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const void *buf,
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size_t len,
|
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int flags,
|
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const struct sockaddr *dst_addr,
|
|
socklen_t addrlen);
|
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int (*libc_setsockopt)(int sockfd,
|
|
int level,
|
|
int optname,
|
|
const void *optval,
|
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socklen_t optlen);
|
|
#ifdef HAVE_SIGNALFD
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int (*libc_signalfd)(int fd, const sigset_t *mask, int flags);
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|
#endif
|
|
int (*libc_socket)(int domain, int type, int protocol);
|
|
int (*libc_socketpair)(int domain, int type, int protocol, int sv[2]);
|
|
#ifdef HAVE_TIMERFD_CREATE
|
|
int (*libc_timerfd_create)(int clockid, int flags);
|
|
#endif
|
|
ssize_t (*libc_write)(int fd, const void *buf, size_t count);
|
|
ssize_t (*libc_writev)(int fd, const struct iovec *iov, int iovcnt);
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};
|
|
|
|
struct swrap {
|
|
void *libc_handle;
|
|
void *libsocket_handle;
|
|
|
|
bool initialised;
|
|
bool enabled;
|
|
|
|
char *socket_dir;
|
|
|
|
struct swrap_libc_fns fns;
|
|
};
|
|
|
|
static struct swrap swrap;
|
|
|
|
/* prototypes */
|
|
static const char *socket_wrapper_dir(void);
|
|
|
|
#define LIBC_NAME "libc.so"
|
|
|
|
enum swrap_lib {
|
|
SWRAP_LIBC,
|
|
SWRAP_LIBNSL,
|
|
SWRAP_LIBSOCKET,
|
|
};
|
|
|
|
#ifndef NDEBUG
|
|
static const char *swrap_str_lib(enum swrap_lib lib)
|
|
{
|
|
switch (lib) {
|
|
case SWRAP_LIBC:
|
|
return "libc";
|
|
case SWRAP_LIBNSL:
|
|
return "libnsl";
|
|
case SWRAP_LIBSOCKET:
|
|
return "libsocket";
|
|
}
|
|
|
|
/* Compiler would warn us about unhandled enum value if we get here */
|
|
return "unknown";
|
|
}
|
|
#endif
|
|
|
|
static void *swrap_load_lib_handle(enum swrap_lib lib)
|
|
{
|
|
int flags = RTLD_LAZY;
|
|
void *handle = NULL;
|
|
int i;
|
|
|
|
#ifdef RTLD_DEEPBIND
|
|
flags |= RTLD_DEEPBIND;
|
|
#endif
|
|
|
|
switch (lib) {
|
|
case SWRAP_LIBNSL:
|
|
/* FALL TROUGH */
|
|
case SWRAP_LIBSOCKET:
|
|
#ifdef HAVE_LIBSOCKET
|
|
handle = swrap.libsocket_handle;
|
|
if (handle == NULL) {
|
|
for (i = 10; i >= 0; i--) {
|
|
char soname[256] = {0};
|
|
|
|
snprintf(soname, sizeof(soname), "libsocket.so.%d", i);
|
|
handle = dlopen(soname, flags);
|
|
if (handle != NULL) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
swrap.libsocket_handle = handle;
|
|
}
|
|
break;
|
|
#endif
|
|
/* FALL TROUGH */
|
|
case SWRAP_LIBC:
|
|
handle = swrap.libc_handle;
|
|
#ifdef LIBC_SO
|
|
if (handle == NULL) {
|
|
handle = dlopen(LIBC_SO, flags);
|
|
|
|
swrap.libc_handle = handle;
|
|
}
|
|
#endif
|
|
if (handle == NULL) {
|
|
for (i = 10; i >= 0; i--) {
|
|
char soname[256] = {0};
|
|
|
|
snprintf(soname, sizeof(soname), "libc.so.%d", i);
|
|
handle = dlopen(soname, flags);
|
|
if (handle != NULL) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
swrap.libc_handle = handle;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (handle == NULL) {
|
|
#ifdef RTLD_NEXT
|
|
handle = swrap.libc_handle = swrap.libsocket_handle = RTLD_NEXT;
|
|
#else
|
|
SWRAP_LOG(SWRAP_LOG_ERROR,
|
|
"Failed to dlopen library: %s\n",
|
|
dlerror());
|
|
exit(-1);
|
|
#endif
|
|
}
|
|
|
|
return handle;
|
|
}
|
|
|
|
static void *_swrap_load_lib_function(enum swrap_lib lib, const char *fn_name)
|
|
{
|
|
void *handle;
|
|
void *func;
|
|
|
|
handle = swrap_load_lib_handle(lib);
|
|
|
|
func = dlsym(handle, fn_name);
|
|
if (func == NULL) {
|
|
SWRAP_LOG(SWRAP_LOG_ERROR,
|
|
"Failed to find %s: %s\n",
|
|
fn_name, dlerror());
|
|
exit(-1);
|
|
}
|
|
|
|
SWRAP_LOG(SWRAP_LOG_TRACE,
|
|
"Loaded %s from %s",
|
|
fn_name, swrap_str_lib(lib));
|
|
return func;
|
|
}
|
|
|
|
#define swrap_load_lib_function(lib, fn_name) \
|
|
if (swrap.fns.libc_##fn_name == NULL) { \
|
|
void *swrap_cast_ptr = _swrap_load_lib_function(lib, #fn_name); \
|
|
*(void **) (&swrap.fns.libc_##fn_name) = \
|
|
swrap_cast_ptr; \
|
|
}
|
|
|
|
|
|
/*
|
|
* IMPORTANT
|
|
*
|
|
* Functions especially from libc need to be loaded individually, you can't load
|
|
* all at once or gdb will segfault at startup. The same applies to valgrind and
|
|
* has probably something todo with with the linker.
|
|
* So we need load each function at the point it is called the first time.
|
|
*/
|
|
#ifdef HAVE_ACCEPT4
|
|
static int libc_accept4(int sockfd,
|
|
struct sockaddr *addr,
|
|
socklen_t *addrlen,
|
|
int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, accept4);
|
|
|
|
return swrap.fns.libc_accept4(sockfd, addr, addrlen, flags);
|
|
}
|
|
|
|
#else /* HAVE_ACCEPT4 */
|
|
|
|
static int libc_accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, accept);
|
|
|
|
return swrap.fns.libc_accept(sockfd, addr, addrlen);
|
|
}
|
|
#endif /* HAVE_ACCEPT4 */
|
|
|
|
static int libc_bind(int sockfd,
|
|
const struct sockaddr *addr,
|
|
socklen_t addrlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, bind);
|
|
|
|
return swrap.fns.libc_bind(sockfd, addr, addrlen);
|
|
}
|
|
|
|
static int libc_close(int fd)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, close);
|
|
|
|
return swrap.fns.libc_close(fd);
|
|
}
|
|
|
|
static int libc_connect(int sockfd,
|
|
const struct sockaddr *addr,
|
|
socklen_t addrlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, connect);
|
|
|
|
return swrap.fns.libc_connect(sockfd, addr, addrlen);
|
|
}
|
|
|
|
static int libc_dup(int fd)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, dup);
|
|
|
|
return swrap.fns.libc_dup(fd);
|
|
}
|
|
|
|
static int libc_dup2(int oldfd, int newfd)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, dup2);
|
|
|
|
return swrap.fns.libc_dup2(oldfd, newfd);
|
|
}
|
|
|
|
#ifdef HAVE_EVENTFD
|
|
static int libc_eventfd(int count, int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, eventfd);
|
|
|
|
return swrap.fns.libc_eventfd(count, flags);
|
|
}
|
|
#endif
|
|
|
|
DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
|
|
static int libc_vfcntl(int fd, int cmd, va_list ap)
|
|
{
|
|
long int args[4];
|
|
int rc;
|
|
int i;
|
|
|
|
swrap_load_lib_function(SWRAP_LIBC, fcntl);
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
args[i] = va_arg(ap, long int);
|
|
}
|
|
|
|
rc = swrap.fns.libc_fcntl(fd,
|
|
cmd,
|
|
args[0],
|
|
args[1],
|
|
args[2],
|
|
args[3]);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int libc_getpeername(int sockfd,
|
|
struct sockaddr *addr,
|
|
socklen_t *addrlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, getpeername);
|
|
|
|
return swrap.fns.libc_getpeername(sockfd, addr, addrlen);
|
|
}
|
|
|
|
static int libc_getsockname(int sockfd,
|
|
struct sockaddr *addr,
|
|
socklen_t *addrlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, getsockname);
|
|
|
|
return swrap.fns.libc_getsockname(sockfd, addr, addrlen);
|
|
}
|
|
|
|
static int libc_getsockopt(int sockfd,
|
|
int level,
|
|
int optname,
|
|
void *optval,
|
|
socklen_t *optlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, getsockopt);
|
|
|
|
return swrap.fns.libc_getsockopt(sockfd, level, optname, optval, optlen);
|
|
}
|
|
|
|
DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
|
|
static int libc_vioctl(int d, unsigned long int request, va_list ap)
|
|
{
|
|
long int args[4];
|
|
int rc;
|
|
int i;
|
|
|
|
swrap_load_lib_function(SWRAP_LIBC, ioctl);
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
args[i] = va_arg(ap, long int);
|
|
}
|
|
|
|
rc = swrap.fns.libc_ioctl(d,
|
|
request,
|
|
args[0],
|
|
args[1],
|
|
args[2],
|
|
args[3]);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int libc_listen(int sockfd, int backlog)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, listen);
|
|
|
|
return swrap.fns.libc_listen(sockfd, backlog);
|
|
}
|
|
|
|
static FILE *libc_fopen(const char *name, const char *mode)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, fopen);
|
|
|
|
return swrap.fns.libc_fopen(name, mode);
|
|
}
|
|
|
|
static int libc_vopen(const char *pathname, int flags, va_list ap)
|
|
{
|
|
long int mode = 0;
|
|
int fd;
|
|
|
|
swrap_load_lib_function(SWRAP_LIBC, open);
|
|
|
|
mode = va_arg(ap, long int);
|
|
|
|
fd = swrap.fns.libc_open(pathname, flags, (mode_t)mode);
|
|
|
|
return fd;
|
|
}
|
|
|
|
static int libc_open(const char *pathname, int flags, ...)
|
|
{
|
|
va_list ap;
|
|
int fd;
|
|
|
|
va_start(ap, flags);
|
|
fd = libc_vopen(pathname, flags, ap);
|
|
va_end(ap);
|
|
|
|
return fd;
|
|
}
|
|
|
|
static int libc_pipe(int pipefd[2])
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, pipe);
|
|
|
|
return swrap.fns.libc_pipe(pipefd);
|
|
}
|
|
|
|
static int libc_read(int fd, void *buf, size_t count)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, read);
|
|
|
|
return swrap.fns.libc_read(fd, buf, count);
|
|
}
|
|
|
|
static ssize_t libc_readv(int fd, const struct iovec *iov, int iovcnt)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, readv);
|
|
|
|
return swrap.fns.libc_readv(fd, iov, iovcnt);
|
|
}
|
|
|
|
static int libc_recv(int sockfd, void *buf, size_t len, int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, recv);
|
|
|
|
return swrap.fns.libc_recv(sockfd, buf, len, flags);
|
|
}
|
|
|
|
static int libc_recvfrom(int sockfd,
|
|
void *buf,
|
|
size_t len,
|
|
int flags,
|
|
struct sockaddr *src_addr,
|
|
socklen_t *addrlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, recvfrom);
|
|
|
|
return swrap.fns.libc_recvfrom(sockfd, buf, len, flags, src_addr, addrlen);
|
|
}
|
|
|
|
static int libc_recvmsg(int sockfd, struct msghdr *msg, int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, recvmsg);
|
|
|
|
return swrap.fns.libc_recvmsg(sockfd, msg, flags);
|
|
}
|
|
|
|
static int libc_send(int sockfd, const void *buf, size_t len, int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, send);
|
|
|
|
return swrap.fns.libc_send(sockfd, buf, len, flags);
|
|
}
|
|
|
|
static int libc_sendmsg(int sockfd, const struct msghdr *msg, int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, sendmsg);
|
|
|
|
return swrap.fns.libc_sendmsg(sockfd, msg, flags);
|
|
}
|
|
|
|
static int libc_sendto(int sockfd,
|
|
const void *buf,
|
|
size_t len,
|
|
int flags,
|
|
const struct sockaddr *dst_addr,
|
|
socklen_t addrlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, sendto);
|
|
|
|
return swrap.fns.libc_sendto(sockfd, buf, len, flags, dst_addr, addrlen);
|
|
}
|
|
|
|
static int libc_setsockopt(int sockfd,
|
|
int level,
|
|
int optname,
|
|
const void *optval,
|
|
socklen_t optlen)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, setsockopt);
|
|
|
|
return swrap.fns.libc_setsockopt(sockfd, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef HAVE_SIGNALFD
|
|
static int libc_signalfd(int fd, const sigset_t *mask, int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, signalfd);
|
|
|
|
return swrap.fns.libc_signalfd(fd, mask, flags);
|
|
}
|
|
#endif
|
|
|
|
static int libc_socket(int domain, int type, int protocol)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, socket);
|
|
|
|
return swrap.fns.libc_socket(domain, type, protocol);
|
|
}
|
|
|
|
static int libc_socketpair(int domain, int type, int protocol, int sv[2])
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, socketpair);
|
|
|
|
return swrap.fns.libc_socketpair(domain, type, protocol, sv);
|
|
}
|
|
|
|
#ifdef HAVE_TIMERFD_CREATE
|
|
static int libc_timerfd_create(int clockid, int flags)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, timerfd_create);
|
|
|
|
return swrap.fns.libc_timerfd_create(clockid, flags);
|
|
}
|
|
#endif
|
|
|
|
static ssize_t libc_write(int fd, const void *buf, size_t count)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBC, write);
|
|
|
|
return swrap.fns.libc_write(fd, buf, count);
|
|
}
|
|
|
|
static ssize_t libc_writev(int fd, const struct iovec *iov, int iovcnt)
|
|
{
|
|
swrap_load_lib_function(SWRAP_LIBSOCKET, writev);
|
|
|
|
return swrap.fns.libc_writev(fd, iov, iovcnt);
|
|
}
|
|
|
|
/*********************************************************
|
|
* SWRAP HELPER FUNCTIONS
|
|
*********************************************************/
|
|
|
|
#ifdef HAVE_IPV6
|
|
/*
|
|
* FD00::5357:5FXX
|
|
*/
|
|
static const struct in6_addr *swrap_ipv6(void)
|
|
{
|
|
static struct in6_addr v;
|
|
static int initialized;
|
|
int ret;
|
|
|
|
if (initialized) {
|
|
return &v;
|
|
}
|
|
initialized = 1;
|
|
|
|
ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
|
|
if (ret <= 0) {
|
|
abort();
|
|
}
|
|
|
|
return &v;
|
|
}
|
|
#endif
|
|
|
|
static void set_port(int family, int prt, struct swrap_address *addr)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
addr->sa.in.sin_port = htons(prt);
|
|
break;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
addr->sa.in6.sin6_port = htons(prt);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static size_t socket_length(int family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
return sizeof(struct sockaddr_in);
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
return sizeof(struct sockaddr_in6);
|
|
#endif
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const char *socket_wrapper_dir(void)
|
|
{
|
|
const char *s = getenv("SOCKET_WRAPPER_DIR");
|
|
if (s == NULL) {
|
|
return NULL;
|
|
}
|
|
/* TODO use realpath(3) here, when we add support for threads */
|
|
if (strncmp(s, "./", 2) == 0) {
|
|
s += 2;
|
|
}
|
|
|
|
SWRAP_LOG(SWRAP_LOG_TRACE, "socket_wrapper_dir: %s", s);
|
|
return s;
|
|
}
|
|
|
|
static unsigned int socket_wrapper_mtu(void)
|
|
{
|
|
static unsigned int max_mtu = 0;
|
|
unsigned int tmp;
|
|
const char *s;
|
|
char *endp;
|
|
|
|
if (max_mtu != 0) {
|
|
return max_mtu;
|
|
}
|
|
|
|
max_mtu = SOCKET_WRAPPER_MTU_DEFAULT;
|
|
|
|
s = getenv("SOCKET_WRAPPER_MTU");
|
|
if (s == NULL) {
|
|
goto done;
|
|
}
|
|
|
|
tmp = strtol(s, &endp, 10);
|
|
if (s == endp) {
|
|
goto done;
|
|
}
|
|
|
|
if (tmp < SOCKET_WRAPPER_MTU_MIN || tmp > SOCKET_WRAPPER_MTU_MAX) {
|
|
goto done;
|
|
}
|
|
max_mtu = tmp;
|
|
|
|
done:
|
|
return max_mtu;
|
|
}
|
|
|
|
bool socket_wrapper_enabled(void)
|
|
{
|
|
const char *s = socket_wrapper_dir();
|
|
|
|
return s != NULL ? true : false;
|
|
}
|
|
|
|
static unsigned int socket_wrapper_default_iface(void)
|
|
{
|
|
const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
|
|
if (s) {
|
|
unsigned int iface;
|
|
if (sscanf(s, "%u", &iface) == 1) {
|
|
if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
|
|
return iface;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;/* 127.0.0.1 */
|
|
}
|
|
|
|
static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
|
|
{
|
|
unsigned int iface;
|
|
unsigned int prt;
|
|
const char *p;
|
|
char type;
|
|
|
|
p = strrchr(un->sun_path, '/');
|
|
if (p) p++; else p = un->sun_path;
|
|
|
|
if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
SWRAP_LOG(SWRAP_LOG_TRACE, "type %c iface %u port %u",
|
|
type, iface, prt);
|
|
|
|
if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (prt > 0xFFFF) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
switch(type) {
|
|
case SOCKET_TYPE_CHAR_TCP:
|
|
case SOCKET_TYPE_CHAR_UDP: {
|
|
struct sockaddr_in *in2 = (struct sockaddr_in *)(void *)in;
|
|
|
|
if ((*len) < sizeof(*in2)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
memset(in2, 0, sizeof(*in2));
|
|
in2->sin_family = AF_INET;
|
|
in2->sin_addr.s_addr = htonl((127<<24) | iface);
|
|
in2->sin_port = htons(prt);
|
|
|
|
*len = sizeof(*in2);
|
|
break;
|
|
}
|
|
#ifdef HAVE_IPV6
|
|
case SOCKET_TYPE_CHAR_TCP_V6:
|
|
case SOCKET_TYPE_CHAR_UDP_V6: {
|
|
struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)(void *)in;
|
|
|
|
if ((*len) < sizeof(*in2)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
memset(in2, 0, sizeof(*in2));
|
|
in2->sin6_family = AF_INET6;
|
|
in2->sin6_addr = *swrap_ipv6();
|
|
in2->sin6_addr.s6_addr[15] = iface;
|
|
in2->sin6_port = htons(prt);
|
|
|
|
*len = sizeof(*in2);
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
|
|
int *bcast)
|
|
{
|
|
char type = '\0';
|
|
unsigned int prt;
|
|
unsigned int iface;
|
|
int is_bcast = 0;
|
|
|
|
if (bcast) *bcast = 0;
|
|
|
|
switch (inaddr->sa_family) {
|
|
case AF_INET: {
|
|
const struct sockaddr_in *in =
|
|
(const struct sockaddr_in *)(const void *)inaddr;
|
|
unsigned int addr = ntohl(in->sin_addr.s_addr);
|
|
char u_type = '\0';
|
|
char b_type = '\0';
|
|
char a_type = '\0';
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
u_type = SOCKET_TYPE_CHAR_TCP;
|
|
break;
|
|
case SOCK_DGRAM:
|
|
u_type = SOCKET_TYPE_CHAR_UDP;
|
|
a_type = SOCKET_TYPE_CHAR_UDP;
|
|
b_type = SOCKET_TYPE_CHAR_UDP;
|
|
break;
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
prt = ntohs(in->sin_port);
|
|
if (a_type && addr == 0xFFFFFFFF) {
|
|
/* 255.255.255.255 only udp */
|
|
is_bcast = 2;
|
|
type = a_type;
|
|
iface = socket_wrapper_default_iface();
|
|
} else if (b_type && addr == 0x7FFFFFFF) {
|
|
/* 127.255.255.255 only udp */
|
|
is_bcast = 1;
|
|
type = b_type;
|
|
iface = socket_wrapper_default_iface();
|
|
} else if ((addr & 0xFFFFFF00) == 0x7F000000) {
|
|
/* 127.0.0.X */
|
|
is_bcast = 0;
|
|
type = u_type;
|
|
iface = (addr & 0x000000FF);
|
|
} else {
|
|
errno = ENETUNREACH;
|
|
return -1;
|
|
}
|
|
if (bcast) *bcast = is_bcast;
|
|
break;
|
|
}
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6: {
|
|
const struct sockaddr_in6 *in =
|
|
(const struct sockaddr_in6 *)(const void *)inaddr;
|
|
struct in6_addr cmp1, cmp2;
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
type = SOCKET_TYPE_CHAR_TCP_V6;
|
|
break;
|
|
case SOCK_DGRAM:
|
|
type = SOCKET_TYPE_CHAR_UDP_V6;
|
|
break;
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
/* XXX no multicast/broadcast */
|
|
|
|
prt = ntohs(in->sin6_port);
|
|
|
|
cmp1 = *swrap_ipv6();
|
|
cmp2 = in->sin6_addr;
|
|
cmp2.s6_addr[15] = 0;
|
|
if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
|
|
iface = in->sin6_addr.s6_addr[15];
|
|
} else {
|
|
errno = ENETUNREACH;
|
|
return -1;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family!\n");
|
|
errno = ENETUNREACH;
|
|
return -1;
|
|
}
|
|
|
|
if (prt == 0) {
|
|
SWRAP_LOG(SWRAP_LOG_WARN, "Port not set\n");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (is_bcast) {
|
|
snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
|
|
socket_wrapper_dir());
|
|
SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path);
|
|
/* the caller need to do more processing */
|
|
return 0;
|
|
}
|
|
|
|
snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
|
|
socket_wrapper_dir(), type, iface, prt);
|
|
SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
|
|
int *bcast)
|
|
{
|
|
char type = '\0';
|
|
unsigned int prt;
|
|
unsigned int iface;
|
|
struct stat st;
|
|
int is_bcast = 0;
|
|
|
|
if (bcast) *bcast = 0;
|
|
|
|
switch (si->family) {
|
|
case AF_INET: {
|
|
const struct sockaddr_in *in =
|
|
(const struct sockaddr_in *)(const void *)inaddr;
|
|
unsigned int addr = ntohl(in->sin_addr.s_addr);
|
|
char u_type = '\0';
|
|
char d_type = '\0';
|
|
char b_type = '\0';
|
|
char a_type = '\0';
|
|
|
|
prt = ntohs(in->sin_port);
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
u_type = SOCKET_TYPE_CHAR_TCP;
|
|
d_type = SOCKET_TYPE_CHAR_TCP;
|
|
break;
|
|
case SOCK_DGRAM:
|
|
u_type = SOCKET_TYPE_CHAR_UDP;
|
|
d_type = SOCKET_TYPE_CHAR_UDP;
|
|
a_type = SOCKET_TYPE_CHAR_UDP;
|
|
b_type = SOCKET_TYPE_CHAR_UDP;
|
|
break;
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
if (addr == 0) {
|
|
/* 0.0.0.0 */
|
|
is_bcast = 0;
|
|
type = d_type;
|
|
iface = socket_wrapper_default_iface();
|
|
} else if (a_type && addr == 0xFFFFFFFF) {
|
|
/* 255.255.255.255 only udp */
|
|
is_bcast = 2;
|
|
type = a_type;
|
|
iface = socket_wrapper_default_iface();
|
|
} else if (b_type && addr == 0x7FFFFFFF) {
|
|
/* 127.255.255.255 only udp */
|
|
is_bcast = 1;
|
|
type = b_type;
|
|
iface = socket_wrapper_default_iface();
|
|
} else if ((addr & 0xFFFFFF00) == 0x7F000000) {
|
|
/* 127.0.0.X */
|
|
is_bcast = 0;
|
|
type = u_type;
|
|
iface = (addr & 0x000000FF);
|
|
} else {
|
|
errno = EADDRNOTAVAIL;
|
|
return -1;
|
|
}
|
|
|
|
/* Store the bind address for connect() */
|
|
if (si->bindname.sa_socklen == 0) {
|
|
struct sockaddr_in bind_in;
|
|
socklen_t blen = sizeof(struct sockaddr_in);
|
|
|
|
ZERO_STRUCT(bind_in);
|
|
bind_in.sin_family = in->sin_family;
|
|
bind_in.sin_port = in->sin_port;
|
|
bind_in.sin_addr.s_addr = htonl(0x7F000000 | iface);
|
|
|
|
si->bindname.sa_socklen = blen;
|
|
memcpy(&si->bindname.sa.in, &bind_in, blen);
|
|
}
|
|
|
|
break;
|
|
}
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6: {
|
|
const struct sockaddr_in6 *in =
|
|
(const struct sockaddr_in6 *)(const void *)inaddr;
|
|
struct in6_addr cmp1, cmp2;
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
type = SOCKET_TYPE_CHAR_TCP_V6;
|
|
break;
|
|
case SOCK_DGRAM:
|
|
type = SOCKET_TYPE_CHAR_UDP_V6;
|
|
break;
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
/* XXX no multicast/broadcast */
|
|
|
|
prt = ntohs(in->sin6_port);
|
|
|
|
cmp1 = *swrap_ipv6();
|
|
cmp2 = in->sin6_addr;
|
|
cmp2.s6_addr[15] = 0;
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
|
|
iface = socket_wrapper_default_iface();
|
|
} else if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
|
|
iface = in->sin6_addr.s6_addr[15];
|
|
} else {
|
|
errno = EADDRNOTAVAIL;
|
|
return -1;
|
|
}
|
|
|
|
/* Store the bind address for connect() */
|
|
if (si->bindname.sa_socklen == 0) {
|
|
struct sockaddr_in6 bind_in;
|
|
socklen_t blen = sizeof(struct sockaddr_in6);
|
|
|
|
ZERO_STRUCT(bind_in);
|
|
bind_in.sin6_family = in->sin6_family;
|
|
bind_in.sin6_port = in->sin6_port;
|
|
|
|
bind_in.sin6_addr = *swrap_ipv6();
|
|
bind_in.sin6_addr.s6_addr[15] = iface;
|
|
|
|
memcpy(&si->bindname.sa.in6, &bind_in, blen);
|
|
si->bindname.sa_socklen = blen;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family\n");
|
|
errno = EADDRNOTAVAIL;
|
|
return -1;
|
|
}
|
|
|
|
|
|
if (bcast) *bcast = is_bcast;
|
|
|
|
if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (prt == 0) {
|
|
/* handle auto-allocation of ephemeral ports */
|
|
for (prt = 5001; prt < 10000; prt++) {
|
|
snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
|
|
socket_wrapper_dir(), type, iface, prt);
|
|
if (stat(un->sun_path, &st) == 0) continue;
|
|
|
|
set_port(si->family, prt, &si->myname);
|
|
set_port(si->family, prt, &si->bindname);
|
|
|
|
break;
|
|
}
|
|
if (prt == 10000) {
|
|
errno = ENFILE;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
|
|
socket_wrapper_dir(), type, iface, prt);
|
|
SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path);
|
|
return 0;
|
|
}
|
|
|
|
static struct socket_info *find_socket_info(int fd)
|
|
{
|
|
struct socket_info *i;
|
|
|
|
for (i = sockets; i; i = i->next) {
|
|
struct socket_info_fd *f;
|
|
for (f = i->fds; f; f = f->next) {
|
|
if (f->fd == fd) {
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#if 0 /* FIXME */
|
|
static bool check_addr_port_in_use(const struct sockaddr *sa, socklen_t len)
|
|
{
|
|
struct socket_info *s;
|
|
|
|
/* first catch invalid input */
|
|
switch (sa->sa_family) {
|
|
case AF_INET:
|
|
if (len < sizeof(struct sockaddr_in)) {
|
|
return false;
|
|
}
|
|
break;
|
|
#if HAVE_IPV6
|
|
case AF_INET6:
|
|
if (len < sizeof(struct sockaddr_in6)) {
|
|
return false;
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
for (s = sockets; s != NULL; s = s->next) {
|
|
if (s->myname == NULL) {
|
|
continue;
|
|
}
|
|
if (s->myname->sa_family != sa->sa_family) {
|
|
continue;
|
|
}
|
|
switch (s->myname->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sin1, *sin2;
|
|
|
|
sin1 = (struct sockaddr_in *)s->myname;
|
|
sin2 = (struct sockaddr_in *)sa;
|
|
|
|
if (sin1->sin_addr.s_addr == htonl(INADDR_ANY)) {
|
|
continue;
|
|
}
|
|
if (sin1->sin_port != sin2->sin_port) {
|
|
continue;
|
|
}
|
|
if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) {
|
|
continue;
|
|
}
|
|
|
|
/* found */
|
|
return true;
|
|
break;
|
|
}
|
|
#if HAVE_IPV6
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sin1, *sin2;
|
|
|
|
sin1 = (struct sockaddr_in6 *)s->myname;
|
|
sin2 = (struct sockaddr_in6 *)sa;
|
|
|
|
if (sin1->sin6_port != sin2->sin6_port) {
|
|
continue;
|
|
}
|
|
if (!IN6_ARE_ADDR_EQUAL(&sin1->sin6_addr,
|
|
&sin2->sin6_addr))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
/* found */
|
|
return true;
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
continue;
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static void swrap_remove_stale(int fd)
|
|
{
|
|
struct socket_info *si = find_socket_info(fd);
|
|
struct socket_info_fd *fi;
|
|
|
|
if (si != NULL) {
|
|
for (fi = si->fds; fi; fi = fi->next) {
|
|
if (fi->fd == fd) {
|
|
SWRAP_LOG(SWRAP_LOG_TRACE, "remove stale wrapper for %d", fd);
|
|
SWRAP_DLIST_REMOVE(si->fds, fi);
|
|
free(fi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (si->fds == NULL) {
|
|
SWRAP_DLIST_REMOVE(sockets, si);
|
|
if (si->un_addr.sun_path[0] != '\0') {
|
|
unlink(si->un_addr.sun_path);
|
|
}
|
|
free(si);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int sockaddr_convert_to_un(struct socket_info *si,
|
|
const struct sockaddr *in_addr,
|
|
socklen_t in_len,
|
|
struct sockaddr_un *out_addr,
|
|
int alloc_sock,
|
|
int *bcast)
|
|
{
|
|
struct sockaddr *out = (struct sockaddr *)(void *)out_addr;
|
|
|
|
(void) in_len; /* unused */
|
|
|
|
if (out_addr == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
out->sa_family = AF_UNIX;
|
|
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
|
|
out->sa_len = sizeof(*out_addr);
|
|
#endif
|
|
|
|
switch (in_addr->sa_family) {
|
|
case AF_UNSPEC: {
|
|
const struct sockaddr_in *sin;
|
|
if (si->family != AF_INET) {
|
|
break;
|
|
}
|
|
if (in_len < sizeof(struct sockaddr_in)) {
|
|
break;
|
|
}
|
|
sin = (const struct sockaddr_in *)(const void *)in_addr;
|
|
if(sin->sin_addr.s_addr != htonl(INADDR_ANY)) {
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Note: in the special case of AF_UNSPEC and INADDR_ANY,
|
|
* AF_UNSPEC is mapped to AF_INET and must be treated here.
|
|
*/
|
|
|
|
/* FALL THROUGH */
|
|
}
|
|
case AF_INET:
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
case SOCK_DGRAM:
|
|
break;
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
if (alloc_sock) {
|
|
return convert_in_un_alloc(si, in_addr, out_addr, bcast);
|
|
} else {
|
|
return convert_in_un_remote(si, in_addr, out_addr, bcast);
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
errno = EAFNOSUPPORT;
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family\n");
|
|
return -1;
|
|
}
|
|
|
|
static int sockaddr_convert_from_un(const struct socket_info *si,
|
|
const struct sockaddr_un *in_addr,
|
|
socklen_t un_addrlen,
|
|
int family,
|
|
struct sockaddr *out_addr,
|
|
socklen_t *out_addrlen)
|
|
{
|
|
int ret;
|
|
|
|
if (out_addr == NULL || out_addrlen == NULL)
|
|
return 0;
|
|
|
|
if (un_addrlen == 0) {
|
|
*out_addrlen = 0;
|
|
return 0;
|
|
}
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
case SOCK_DGRAM:
|
|
break;
|
|
default:
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
ret = convert_un_in(in_addr, out_addr, out_addrlen);
|
|
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
|
|
out_addr->sa_len = *out_addrlen;
|
|
#endif
|
|
return ret;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family\n");
|
|
errno = EAFNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
enum swrap_packet_type {
|
|
SWRAP_CONNECT_SEND,
|
|
SWRAP_CONNECT_UNREACH,
|
|
SWRAP_CONNECT_RECV,
|
|
SWRAP_CONNECT_ACK,
|
|
SWRAP_ACCEPT_SEND,
|
|
SWRAP_ACCEPT_RECV,
|
|
SWRAP_ACCEPT_ACK,
|
|
SWRAP_RECVFROM,
|
|
SWRAP_SENDTO,
|
|
SWRAP_SENDTO_UNREACH,
|
|
SWRAP_PENDING_RST,
|
|
SWRAP_RECV,
|
|
SWRAP_RECV_RST,
|
|
SWRAP_SEND,
|
|
SWRAP_SEND_RST,
|
|
SWRAP_CLOSE_SEND,
|
|
SWRAP_CLOSE_RECV,
|
|
SWRAP_CLOSE_ACK,
|
|
};
|
|
|
|
struct swrap_file_hdr {
|
|
uint32_t magic;
|
|
uint16_t version_major;
|
|
uint16_t version_minor;
|
|
int32_t timezone;
|
|
uint32_t sigfigs;
|
|
uint32_t frame_max_len;
|
|
#define SWRAP_FRAME_LENGTH_MAX 0xFFFF
|
|
uint32_t link_type;
|
|
};
|
|
#define SWRAP_FILE_HDR_SIZE 24
|
|
|
|
struct swrap_packet_frame {
|
|
uint32_t seconds;
|
|
uint32_t micro_seconds;
|
|
uint32_t recorded_length;
|
|
uint32_t full_length;
|
|
};
|
|
#define SWRAP_PACKET_FRAME_SIZE 16
|
|
|
|
union swrap_packet_ip {
|
|
struct {
|
|
uint8_t ver_hdrlen;
|
|
uint8_t tos;
|
|
uint16_t packet_length;
|
|
uint16_t identification;
|
|
uint8_t flags;
|
|
uint8_t fragment;
|
|
uint8_t ttl;
|
|
uint8_t protocol;
|
|
uint16_t hdr_checksum;
|
|
uint32_t src_addr;
|
|
uint32_t dest_addr;
|
|
} v4;
|
|
#define SWRAP_PACKET_IP_V4_SIZE 20
|
|
struct {
|
|
uint8_t ver_prio;
|
|
uint8_t flow_label_high;
|
|
uint16_t flow_label_low;
|
|
uint16_t payload_length;
|
|
uint8_t next_header;
|
|
uint8_t hop_limit;
|
|
uint8_t src_addr[16];
|
|
uint8_t dest_addr[16];
|
|
} v6;
|
|
#define SWRAP_PACKET_IP_V6_SIZE 40
|
|
};
|
|
#define SWRAP_PACKET_IP_SIZE 40
|
|
|
|
union swrap_packet_payload {
|
|
struct {
|
|
uint16_t source_port;
|
|
uint16_t dest_port;
|
|
uint32_t seq_num;
|
|
uint32_t ack_num;
|
|
uint8_t hdr_length;
|
|
uint8_t control;
|
|
uint16_t window;
|
|
uint16_t checksum;
|
|
uint16_t urg;
|
|
} tcp;
|
|
#define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
|
|
struct {
|
|
uint16_t source_port;
|
|
uint16_t dest_port;
|
|
uint16_t length;
|
|
uint16_t checksum;
|
|
} udp;
|
|
#define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
|
|
struct {
|
|
uint8_t type;
|
|
uint8_t code;
|
|
uint16_t checksum;
|
|
uint32_t unused;
|
|
} icmp4;
|
|
#define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
|
|
struct {
|
|
uint8_t type;
|
|
uint8_t code;
|
|
uint16_t checksum;
|
|
uint32_t unused;
|
|
} icmp6;
|
|
#define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
|
|
};
|
|
#define SWRAP_PACKET_PAYLOAD_SIZE 20
|
|
|
|
#define SWRAP_PACKET_MIN_ALLOC \
|
|
(SWRAP_PACKET_FRAME_SIZE + \
|
|
SWRAP_PACKET_IP_SIZE + \
|
|
SWRAP_PACKET_PAYLOAD_SIZE)
|
|
|
|
static const char *swrap_pcap_init_file(void)
|
|
{
|
|
static int initialized = 0;
|
|
static const char *s = NULL;
|
|
static const struct swrap_file_hdr h;
|
|
static const struct swrap_packet_frame f;
|
|
static const union swrap_packet_ip i;
|
|
static const union swrap_packet_payload p;
|
|
|
|
if (initialized == 1) {
|
|
return s;
|
|
}
|
|
initialized = 1;
|
|
|
|
/*
|
|
* TODO: don't use the structs use plain buffer offsets
|
|
* and PUSH_U8(), PUSH_U16() and PUSH_U32()
|
|
*
|
|
* for now make sure we disable PCAP support
|
|
* if the struct has alignment!
|
|
*/
|
|
if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
|
|
return NULL;
|
|
}
|
|
if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
|
|
return NULL;
|
|
}
|
|
|
|
s = getenv("SOCKET_WRAPPER_PCAP_FILE");
|
|
if (s == NULL) {
|
|
return NULL;
|
|
}
|
|
if (strncmp(s, "./", 2) == 0) {
|
|
s += 2;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
static uint8_t *swrap_pcap_packet_init(struct timeval *tval,
|
|
const struct sockaddr *src,
|
|
const struct sockaddr *dest,
|
|
int socket_type,
|
|
const uint8_t *payload,
|
|
size_t payload_len,
|
|
unsigned long tcp_seqno,
|
|
unsigned long tcp_ack,
|
|
unsigned char tcp_ctl,
|
|
int unreachable,
|
|
size_t *_packet_len)
|
|
{
|
|
uint8_t *base;
|
|
uint8_t *buf;
|
|
struct swrap_packet_frame *frame;
|
|
union swrap_packet_ip *ip;
|
|
union swrap_packet_payload *pay;
|
|
size_t packet_len;
|
|
size_t alloc_len;
|
|
size_t nonwire_len = sizeof(*frame);
|
|
size_t wire_hdr_len = 0;
|
|
size_t wire_len = 0;
|
|
size_t ip_hdr_len = 0;
|
|
size_t icmp_hdr_len = 0;
|
|
size_t icmp_truncate_len = 0;
|
|
uint8_t protocol = 0, icmp_protocol = 0;
|
|
const struct sockaddr_in *src_in = NULL;
|
|
const struct sockaddr_in *dest_in = NULL;
|
|
#ifdef HAVE_IPV6
|
|
const struct sockaddr_in6 *src_in6 = NULL;
|
|
const struct sockaddr_in6 *dest_in6 = NULL;
|
|
#endif
|
|
uint16_t src_port;
|
|
uint16_t dest_port;
|
|
|
|
switch (src->sa_family) {
|
|
case AF_INET:
|
|
src_in = (const struct sockaddr_in *)(const void *)src;
|
|
dest_in = (const struct sockaddr_in *)(const void *)dest;
|
|
src_port = src_in->sin_port;
|
|
dest_port = dest_in->sin_port;
|
|
ip_hdr_len = sizeof(ip->v4);
|
|
break;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
src_in6 = (const struct sockaddr_in6 *)(const void *)src;
|
|
dest_in6 = (const struct sockaddr_in6 *)(const void *)dest;
|
|
src_port = src_in6->sin6_port;
|
|
dest_port = dest_in6->sin6_port;
|
|
ip_hdr_len = sizeof(ip->v6);
|
|
break;
|
|
#endif
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
switch (socket_type) {
|
|
case SOCK_STREAM:
|
|
protocol = 0x06; /* TCP */
|
|
wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
|
|
wire_len = wire_hdr_len + payload_len;
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
protocol = 0x11; /* UDP */
|
|
wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
|
|
wire_len = wire_hdr_len + payload_len;
|
|
break;
|
|
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
if (unreachable) {
|
|
icmp_protocol = protocol;
|
|
switch (src->sa_family) {
|
|
case AF_INET:
|
|
protocol = 0x01; /* ICMPv4 */
|
|
icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
|
|
break;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
protocol = 0x3A; /* ICMPv6 */
|
|
icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
|
|
break;
|
|
#endif
|
|
}
|
|
if (wire_len > 64 ) {
|
|
icmp_truncate_len = wire_len - 64;
|
|
}
|
|
wire_hdr_len += icmp_hdr_len;
|
|
wire_len += icmp_hdr_len;
|
|
}
|
|
|
|
packet_len = nonwire_len + wire_len;
|
|
alloc_len = packet_len;
|
|
if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
|
|
alloc_len = SWRAP_PACKET_MIN_ALLOC;
|
|
}
|
|
|
|
base = (uint8_t *)calloc(1, alloc_len);
|
|
if (base == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
buf = base;
|
|
|
|
frame = (struct swrap_packet_frame *)(void *)buf;
|
|
frame->seconds = tval->tv_sec;
|
|
frame->micro_seconds = tval->tv_usec;
|
|
frame->recorded_length = wire_len - icmp_truncate_len;
|
|
frame->full_length = wire_len - icmp_truncate_len;
|
|
buf += SWRAP_PACKET_FRAME_SIZE;
|
|
|
|
ip = (union swrap_packet_ip *)(void *)buf;
|
|
switch (src->sa_family) {
|
|
case AF_INET:
|
|
ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
|
|
ip->v4.tos = 0x00;
|
|
ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
|
|
ip->v4.identification = htons(0xFFFF);
|
|
ip->v4.flags = 0x40; /* BIT 1 set - means don't fragment */
|
|
ip->v4.fragment = htons(0x0000);
|
|
ip->v4.ttl = 0xFF;
|
|
ip->v4.protocol = protocol;
|
|
ip->v4.hdr_checksum = htons(0x0000);
|
|
ip->v4.src_addr = src_in->sin_addr.s_addr;
|
|
ip->v4.dest_addr = dest_in->sin_addr.s_addr;
|
|
buf += SWRAP_PACKET_IP_V4_SIZE;
|
|
break;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
|
|
ip->v6.flow_label_high = 0x00;
|
|
ip->v6.flow_label_low = 0x0000;
|
|
ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
|
|
ip->v6.next_header = protocol;
|
|
memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
|
|
memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
|
|
buf += SWRAP_PACKET_IP_V6_SIZE;
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
if (unreachable) {
|
|
pay = (union swrap_packet_payload *)(void *)buf;
|
|
switch (src->sa_family) {
|
|
case AF_INET:
|
|
pay->icmp4.type = 0x03; /* destination unreachable */
|
|
pay->icmp4.code = 0x01; /* host unreachable */
|
|
pay->icmp4.checksum = htons(0x0000);
|
|
pay->icmp4.unused = htonl(0x00000000);
|
|
buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
|
|
|
|
/* set the ip header in the ICMP payload */
|
|
ip = (union swrap_packet_ip *)(void *)buf;
|
|
ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
|
|
ip->v4.tos = 0x00;
|
|
ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
|
|
ip->v4.identification = htons(0xFFFF);
|
|
ip->v4.flags = 0x40; /* BIT 1 set - means don't fragment */
|
|
ip->v4.fragment = htons(0x0000);
|
|
ip->v4.ttl = 0xFF;
|
|
ip->v4.protocol = icmp_protocol;
|
|
ip->v4.hdr_checksum = htons(0x0000);
|
|
ip->v4.src_addr = dest_in->sin_addr.s_addr;
|
|
ip->v4.dest_addr = src_in->sin_addr.s_addr;
|
|
buf += SWRAP_PACKET_IP_V4_SIZE;
|
|
|
|
src_port = dest_in->sin_port;
|
|
dest_port = src_in->sin_port;
|
|
break;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
pay->icmp6.type = 0x01; /* destination unreachable */
|
|
pay->icmp6.code = 0x03; /* address unreachable */
|
|
pay->icmp6.checksum = htons(0x0000);
|
|
pay->icmp6.unused = htonl(0x00000000);
|
|
buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
|
|
|
|
/* set the ip header in the ICMP payload */
|
|
ip = (union swrap_packet_ip *)(void *)buf;
|
|
ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
|
|
ip->v6.flow_label_high = 0x00;
|
|
ip->v6.flow_label_low = 0x0000;
|
|
ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
|
|
ip->v6.next_header = protocol;
|
|
memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
|
|
memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
|
|
buf += SWRAP_PACKET_IP_V6_SIZE;
|
|
|
|
src_port = dest_in6->sin6_port;
|
|
dest_port = src_in6->sin6_port;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
pay = (union swrap_packet_payload *)(void *)buf;
|
|
|
|
switch (socket_type) {
|
|
case SOCK_STREAM:
|
|
pay->tcp.source_port = src_port;
|
|
pay->tcp.dest_port = dest_port;
|
|
pay->tcp.seq_num = htonl(tcp_seqno);
|
|
pay->tcp.ack_num = htonl(tcp_ack);
|
|
pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
|
|
pay->tcp.control = tcp_ctl;
|
|
pay->tcp.window = htons(0x7FFF);
|
|
pay->tcp.checksum = htons(0x0000);
|
|
pay->tcp.urg = htons(0x0000);
|
|
buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
|
|
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
pay->udp.source_port = src_port;
|
|
pay->udp.dest_port = dest_port;
|
|
pay->udp.length = htons(8 + payload_len);
|
|
pay->udp.checksum = htons(0x0000);
|
|
buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
|
|
|
|
break;
|
|
}
|
|
|
|
if (payload && payload_len > 0) {
|
|
memcpy(buf, payload, payload_len);
|
|
}
|
|
|
|
*_packet_len = packet_len - icmp_truncate_len;
|
|
return base;
|
|
}
|
|
|
|
static int swrap_pcap_get_fd(const char *fname)
|
|
{
|
|
static int fd = -1;
|
|
|
|
if (fd != -1) return fd;
|
|
|
|
fd = libc_open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
|
|
if (fd != -1) {
|
|
struct swrap_file_hdr file_hdr;
|
|
file_hdr.magic = 0xA1B2C3D4;
|
|
file_hdr.version_major = 0x0002;
|
|
file_hdr.version_minor = 0x0004;
|
|
file_hdr.timezone = 0x00000000;
|
|
file_hdr.sigfigs = 0x00000000;
|
|
file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
|
|
file_hdr.link_type = 0x0065; /* 101 RAW IP */
|
|
|
|
if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
|
|
close(fd);
|
|
fd = -1;
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
fd = libc_open(fname, O_WRONLY|O_APPEND, 0644);
|
|
|
|
return fd;
|
|
}
|
|
|
|
static uint8_t *swrap_pcap_marshall_packet(struct socket_info *si,
|
|
const struct sockaddr *addr,
|
|
enum swrap_packet_type type,
|
|
const void *buf, size_t len,
|
|
size_t *packet_len)
|
|
{
|
|
const struct sockaddr *src_addr;
|
|
const struct sockaddr *dest_addr;
|
|
unsigned long tcp_seqno = 0;
|
|
unsigned long tcp_ack = 0;
|
|
unsigned char tcp_ctl = 0;
|
|
int unreachable = 0;
|
|
|
|
struct timeval tv;
|
|
|
|
switch (si->family) {
|
|
case AF_INET:
|
|
break;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
break;
|
|
#endif
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
switch (type) {
|
|
case SWRAP_CONNECT_SEND:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
src_addr = &si->myname.sa.s;
|
|
dest_addr = addr;
|
|
|
|
tcp_seqno = si->io.pck_snd;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x02; /* SYN */
|
|
|
|
si->io.pck_snd += 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_CONNECT_RECV:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = addr;
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x12; /** SYN,ACK */
|
|
|
|
si->io.pck_rcv += 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_CONNECT_UNREACH:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = addr;
|
|
|
|
/* Unreachable: resend the data of SWRAP_CONNECT_SEND */
|
|
tcp_seqno = si->io.pck_snd - 1;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x02; /* SYN */
|
|
unreachable = 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_CONNECT_ACK:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
src_addr = &si->myname.sa.s;
|
|
dest_addr = addr;
|
|
|
|
tcp_seqno = si->io.pck_snd;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x10; /* ACK */
|
|
|
|
break;
|
|
|
|
case SWRAP_ACCEPT_SEND:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = addr;
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x02; /* SYN */
|
|
|
|
si->io.pck_rcv += 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_ACCEPT_RECV:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
src_addr = &si->myname.sa.s;
|
|
dest_addr = addr;
|
|
|
|
tcp_seqno = si->io.pck_snd;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x12; /* SYN,ACK */
|
|
|
|
si->io.pck_snd += 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_ACCEPT_ACK:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = addr;
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x10; /* ACK */
|
|
|
|
break;
|
|
|
|
case SWRAP_SEND:
|
|
src_addr = &si->myname.sa.s;
|
|
dest_addr = &si->peername.sa.s;
|
|
|
|
tcp_seqno = si->io.pck_snd;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x18; /* PSH,ACK */
|
|
|
|
si->io.pck_snd += len;
|
|
|
|
break;
|
|
|
|
case SWRAP_SEND_RST:
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = &si->peername.sa.s;
|
|
|
|
if (si->type == SOCK_DGRAM) {
|
|
return swrap_pcap_marshall_packet(si,
|
|
&si->peername.sa.s,
|
|
SWRAP_SENDTO_UNREACH,
|
|
buf,
|
|
len,
|
|
packet_len);
|
|
}
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x14; /** RST,ACK */
|
|
|
|
break;
|
|
|
|
case SWRAP_PENDING_RST:
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = &si->peername.sa.s;
|
|
|
|
if (si->type == SOCK_DGRAM) {
|
|
return NULL;
|
|
}
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x14; /* RST,ACK */
|
|
|
|
break;
|
|
|
|
case SWRAP_RECV:
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = &si->peername.sa.s;
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x18; /* PSH,ACK */
|
|
|
|
si->io.pck_rcv += len;
|
|
|
|
break;
|
|
|
|
case SWRAP_RECV_RST:
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = &si->peername.sa.s;
|
|
|
|
if (si->type == SOCK_DGRAM) {
|
|
return NULL;
|
|
}
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x14; /* RST,ACK */
|
|
|
|
break;
|
|
|
|
case SWRAP_SENDTO:
|
|
src_addr = &si->myname.sa.s;
|
|
dest_addr = addr;
|
|
|
|
si->io.pck_snd += len;
|
|
|
|
break;
|
|
|
|
case SWRAP_SENDTO_UNREACH:
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = addr;
|
|
|
|
unreachable = 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_RECVFROM:
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = addr;
|
|
|
|
si->io.pck_rcv += len;
|
|
|
|
break;
|
|
|
|
case SWRAP_CLOSE_SEND:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
src_addr = &si->myname.sa.s;
|
|
dest_addr = &si->peername.sa.s;
|
|
|
|
tcp_seqno = si->io.pck_snd;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x11; /* FIN, ACK */
|
|
|
|
si->io.pck_snd += 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_CLOSE_RECV:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
dest_addr = &si->myname.sa.s;
|
|
src_addr = &si->peername.sa.s;
|
|
|
|
tcp_seqno = si->io.pck_rcv;
|
|
tcp_ack = si->io.pck_snd;
|
|
tcp_ctl = 0x11; /* FIN,ACK */
|
|
|
|
si->io.pck_rcv += 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_CLOSE_ACK:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
src_addr = &si->myname.sa.s;
|
|
dest_addr = &si->peername.sa.s;
|
|
|
|
tcp_seqno = si->io.pck_snd;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x10; /* ACK */
|
|
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
swrapGetTimeOfDay(&tv);
|
|
|
|
return swrap_pcap_packet_init(&tv,
|
|
src_addr,
|
|
dest_addr,
|
|
si->type,
|
|
(const uint8_t *)buf,
|
|
len,
|
|
tcp_seqno,
|
|
tcp_ack,
|
|
tcp_ctl,
|
|
unreachable,
|
|
packet_len);
|
|
}
|
|
|
|
static void swrap_pcap_dump_packet(struct socket_info *si,
|
|
const struct sockaddr *addr,
|
|
enum swrap_packet_type type,
|
|
const void *buf, size_t len)
|
|
{
|
|
const char *file_name;
|
|
uint8_t *packet;
|
|
size_t packet_len = 0;
|
|
int fd;
|
|
|
|
file_name = swrap_pcap_init_file();
|
|
if (!file_name) {
|
|
return;
|
|
}
|
|
|
|
packet = swrap_pcap_marshall_packet(si,
|
|
addr,
|
|
type,
|
|
buf,
|
|
len,
|
|
&packet_len);
|
|
if (packet == NULL) {
|
|
return;
|
|
}
|
|
|
|
fd = swrap_pcap_get_fd(file_name);
|
|
if (fd != -1) {
|
|
if (write(fd, packet, packet_len) != (ssize_t)packet_len) {
|
|
free(packet);
|
|
return;
|
|
}
|
|
}
|
|
|
|
free(packet);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* SIGNALFD
|
|
***************************************************************************/
|
|
|
|
#ifdef HAVE_SIGNALFD
|
|
static int swrap_signalfd(int fd, const sigset_t *mask, int flags)
|
|
{
|
|
int rc;
|
|
|
|
rc = libc_signalfd(fd, mask, flags);
|
|
if (rc != -1) {
|
|
swrap_remove_stale(fd);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int signalfd(int fd, const sigset_t *mask, int flags)
|
|
{
|
|
return swrap_signalfd(fd, mask, flags);
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* SOCKET
|
|
***************************************************************************/
|
|
|
|
static int swrap_socket(int family, int type, int protocol)
|
|
{
|
|
struct socket_info *si;
|
|
struct socket_info_fd *fi;
|
|
int fd;
|
|
int real_type = type;
|
|
|
|
/*
|
|
* Remove possible addition flags passed to socket() so
|
|
* do not fail checking the type.
|
|
* See https://lwn.net/Articles/281965/
|
|
*/
|
|
#ifdef SOCK_CLOEXEC
|
|
real_type &= ~SOCK_CLOEXEC;
|
|
#endif
|
|
#ifdef SOCK_NONBLOCK
|
|
real_type &= ~SOCK_NONBLOCK;
|
|
#endif
|
|
|
|
if (!socket_wrapper_enabled()) {
|
|
return libc_socket(family, type, protocol);
|
|
}
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
break;
|
|
#ifdef AF_NETLINK
|
|
case AF_NETLINK:
|
|
#endif /* AF_NETLINK */
|
|
#ifdef AF_PACKET
|
|
case AF_PACKET:
|
|
#endif /* AF_PACKET */
|
|
case AF_UNIX:
|
|
return libc_socket(family, type, protocol);
|
|
default:
|
|
errno = EAFNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
switch (real_type) {
|
|
case SOCK_STREAM:
|
|
break;
|
|
case SOCK_DGRAM:
|
|
break;
|
|
default:
|
|
errno = EPROTONOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
switch (protocol) {
|
|
case 0:
|
|
break;
|
|
case 6:
|
|
if (real_type == SOCK_STREAM) {
|
|
break;
|
|
}
|
|
/*fall through*/
|
|
case 17:
|
|
if (real_type == SOCK_DGRAM) {
|
|
break;
|
|
}
|
|
/*fall through*/
|
|
default:
|
|
errno = EPROTONOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* We must call libc_socket with type, from the caller, not the version
|
|
* we removed SOCK_CLOEXEC and SOCK_NONBLOCK from
|
|
*/
|
|
fd = libc_socket(AF_UNIX, type, 0);
|
|
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
/* Check if we have a stale fd and remove it */
|
|
si = find_socket_info(fd);
|
|
if (si != NULL) {
|
|
swrap_remove_stale(fd);
|
|
}
|
|
|
|
si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
|
|
if (si == NULL) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
si->family = family;
|
|
|
|
/* however, the rest of the socket_wrapper code expects just
|
|
* the type, not the flags */
|
|
si->type = real_type;
|
|
si->protocol = protocol;
|
|
|
|
/*
|
|
* Setup myname so getsockname() can succeed to find out the socket
|
|
* type.
|
|
*/
|
|
switch(si->family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in sin = {
|
|
.sin_family = AF_INET,
|
|
};
|
|
|
|
si->myname.sa_socklen = sizeof(struct sockaddr_in);
|
|
memcpy(&si->myname.sa.in, &sin, si->myname.sa_socklen);
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 sin6 = {
|
|
.sin6_family = AF_INET6,
|
|
};
|
|
|
|
si->myname.sa_socklen = sizeof(struct sockaddr_in6);
|
|
memcpy(&si->myname.sa.in6, &sin6, si->myname.sa_socklen);
|
|
break;
|
|
}
|
|
default:
|
|
free(si);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
|
|
if (fi == NULL) {
|
|
free(si);
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
fi->fd = fd;
|
|
|
|
SWRAP_DLIST_ADD(si->fds, fi);
|
|
SWRAP_DLIST_ADD(sockets, si);
|
|
|
|
SWRAP_LOG(SWRAP_LOG_TRACE,
|
|
"Created %s socket for protocol %s",
|
|
si->family == AF_INET ? "IPv4" : "IPv6",
|
|
si->type == SOCK_DGRAM ? "UDP" : "TCP");
|
|
|
|
return fd;
|
|
}
|
|
|
|
int socket(int family, int type, int protocol)
|
|
{
|
|
return swrap_socket(family, type, protocol);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* SOCKETPAIR
|
|
***************************************************************************/
|
|
|
|
static int swrap_socketpair(int family, int type, int protocol, int sv[2])
|
|
{
|
|
int rc;
|
|
|
|
rc = libc_socketpair(family, type, protocol, sv);
|
|
if (rc != -1) {
|
|
swrap_remove_stale(sv[0]);
|
|
swrap_remove_stale(sv[1]);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int socketpair(int family, int type, int protocol, int sv[2])
|
|
{
|
|
return swrap_socketpair(family, type, protocol, sv);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* SOCKETPAIR
|
|
***************************************************************************/
|
|
|
|
#ifdef HAVE_TIMERFD_CREATE
|
|
static int swrap_timerfd_create(int clockid, int flags)
|
|
{
|
|
int fd;
|
|
|
|
fd = libc_timerfd_create(clockid, flags);
|
|
if (fd != -1) {
|
|
swrap_remove_stale(fd);
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
int timerfd_create(int clockid, int flags)
|
|
{
|
|
return swrap_timerfd_create(clockid, flags);
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* PIPE
|
|
***************************************************************************/
|
|
|
|
static int swrap_pipe(int pipefd[2])
|
|
{
|
|
int rc;
|
|
|
|
rc = libc_pipe(pipefd);
|
|
if (rc != -1) {
|
|
swrap_remove_stale(pipefd[0]);
|
|
swrap_remove_stale(pipefd[1]);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int pipe(int pipefd[2])
|
|
{
|
|
return swrap_pipe(pipefd);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* ACCEPT
|
|
***************************************************************************/
|
|
|
|
static int swrap_accept(int s,
|
|
struct sockaddr *addr,
|
|
socklen_t *addrlen,
|
|
int flags)
|
|
{
|
|
struct socket_info *parent_si, *child_si;
|
|
struct socket_info_fd *child_fi;
|
|
int fd;
|
|
struct swrap_address un_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
struct swrap_address un_my_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
struct swrap_address in_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage),
|
|
};
|
|
struct swrap_address in_my_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage),
|
|
};
|
|
int ret;
|
|
|
|
parent_si = find_socket_info(s);
|
|
if (!parent_si) {
|
|
#ifdef HAVE_ACCEPT4
|
|
return libc_accept4(s, addr, addrlen, flags);
|
|
#else
|
|
return libc_accept(s, addr, addrlen);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* assume out sockaddr have the same size as the in parent
|
|
* socket family
|
|
*/
|
|
in_addr.sa_socklen = socket_length(parent_si->family);
|
|
if (in_addr.sa_socklen <= 0) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
#ifdef HAVE_ACCEPT4
|
|
ret = libc_accept4(s, &un_addr.sa.s, &un_addr.sa_socklen, flags);
|
|
#else
|
|
ret = libc_accept(s, &un_addr.sa.s, &un_addr.sa_socklen);
|
|
#endif
|
|
if (ret == -1) {
|
|
if (errno == ENOTSOCK) {
|
|
/* Remove stale fds */
|
|
swrap_remove_stale(s);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
fd = ret;
|
|
|
|
ret = sockaddr_convert_from_un(parent_si,
|
|
&un_addr.sa.un,
|
|
un_addr.sa_socklen,
|
|
parent_si->family,
|
|
&in_addr.sa.s,
|
|
&in_addr.sa_socklen);
|
|
if (ret == -1) {
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
child_si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
|
|
if (child_si == NULL) {
|
|
close(fd);
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
child_fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
|
|
if (child_fi == NULL) {
|
|
free(child_si);
|
|
close(fd);
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
child_fi->fd = fd;
|
|
|
|
SWRAP_DLIST_ADD(child_si->fds, child_fi);
|
|
|
|
child_si->family = parent_si->family;
|
|
child_si->type = parent_si->type;
|
|
child_si->protocol = parent_si->protocol;
|
|
child_si->bound = 1;
|
|
child_si->is_server = 1;
|
|
child_si->connected = 1;
|
|
|
|
child_si->peername = (struct swrap_address) {
|
|
.sa_socklen = in_addr.sa_socklen,
|
|
};
|
|
memcpy(&child_si->peername.sa.ss, &in_addr.sa.ss, in_addr.sa_socklen);
|
|
|
|
if (addr != NULL && addrlen != NULL) {
|
|
size_t copy_len = MIN(*addrlen, in_addr.sa_socklen);
|
|
if (copy_len > 0) {
|
|
memcpy(addr, &in_addr.sa.ss, copy_len);
|
|
}
|
|
*addrlen = in_addr.sa_socklen;
|
|
}
|
|
|
|
ret = libc_getsockname(fd,
|
|
&un_my_addr.sa.s,
|
|
&un_my_addr.sa_socklen);
|
|
if (ret == -1) {
|
|
free(child_fi);
|
|
free(child_si);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
ret = sockaddr_convert_from_un(child_si,
|
|
&un_my_addr.sa.un,
|
|
un_my_addr.sa_socklen,
|
|
child_si->family,
|
|
&in_my_addr.sa.s,
|
|
&in_my_addr.sa_socklen);
|
|
if (ret == -1) {
|
|
free(child_fi);
|
|
free(child_si);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
SWRAP_LOG(SWRAP_LOG_TRACE,
|
|
"accept() path=%s, fd=%d",
|
|
un_my_addr.sa.un.sun_path, s);
|
|
|
|
child_si->myname = (struct swrap_address) {
|
|
.sa_socklen = in_my_addr.sa_socklen,
|
|
};
|
|
memcpy(&child_si->myname.sa.ss, &in_my_addr.sa.ss, in_my_addr.sa_socklen);
|
|
|
|
SWRAP_DLIST_ADD(sockets, child_si);
|
|
|
|
if (addr != NULL) {
|
|
swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
|
|
swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
|
|
swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
#ifdef HAVE_ACCEPT4
|
|
int accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags)
|
|
{
|
|
return swrap_accept(s, addr, (socklen_t *)addrlen, flags);
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_ACCEPT_PSOCKLEN_T
|
|
int accept(int s, struct sockaddr *addr, Psocklen_t addrlen)
|
|
#else
|
|
int accept(int s, struct sockaddr *addr, socklen_t *addrlen)
|
|
#endif
|
|
{
|
|
return swrap_accept(s, addr, (socklen_t *)addrlen, 0);
|
|
}
|
|
|
|
static int autobind_start_init;
|
|
static int autobind_start;
|
|
|
|
/* using sendto() or connect() on an unbound socket would give the
|
|
recipient no way to reply, as unlike UDP and TCP, a unix domain
|
|
socket can't auto-assign ephemeral port numbers, so we need to
|
|
assign it here.
|
|
Note: this might change the family from ipv6 to ipv4
|
|
*/
|
|
static int swrap_auto_bind(int fd, struct socket_info *si, int family)
|
|
{
|
|
struct swrap_address un_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
int i;
|
|
char type;
|
|
int ret;
|
|
int port;
|
|
struct stat st;
|
|
|
|
if (autobind_start_init != 1) {
|
|
autobind_start_init = 1;
|
|
autobind_start = getpid();
|
|
autobind_start %= 50000;
|
|
autobind_start += 10000;
|
|
}
|
|
|
|
un_addr.sa.un.sun_family = AF_UNIX;
|
|
|
|
switch (family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in in;
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
type = SOCKET_TYPE_CHAR_TCP;
|
|
break;
|
|
case SOCK_DGRAM:
|
|
type = SOCKET_TYPE_CHAR_UDP;
|
|
break;
|
|
default:
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
memset(&in, 0, sizeof(in));
|
|
in.sin_family = AF_INET;
|
|
in.sin_addr.s_addr = htonl(127<<24 |
|
|
socket_wrapper_default_iface());
|
|
|
|
si->myname = (struct swrap_address) {
|
|
.sa_socklen = sizeof(in),
|
|
};
|
|
memcpy(&si->myname.sa.in, &in, si->myname.sa_socklen);
|
|
break;
|
|
}
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 in6;
|
|
|
|
if (si->family != family) {
|
|
errno = ENETUNREACH;
|
|
return -1;
|
|
}
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
type = SOCKET_TYPE_CHAR_TCP_V6;
|
|
break;
|
|
case SOCK_DGRAM:
|
|
type = SOCKET_TYPE_CHAR_UDP_V6;
|
|
break;
|
|
default:
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
memset(&in6, 0, sizeof(in6));
|
|
in6.sin6_family = AF_INET6;
|
|
in6.sin6_addr = *swrap_ipv6();
|
|
in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
|
|
|
|
si->myname = (struct swrap_address) {
|
|
.sa_socklen = sizeof(in6),
|
|
};
|
|
memcpy(&si->myname.sa.in6, &in6, si->myname.sa_socklen);
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
if (autobind_start > 60000) {
|
|
autobind_start = 10000;
|
|
}
|
|
|
|
for (i = 0; i < SOCKET_MAX_SOCKETS; i++) {
|
|
port = autobind_start + i;
|
|
snprintf(un_addr.sa.un.sun_path, sizeof(un_addr.sa.un.sun_path),
|
|
"%s/"SOCKET_FORMAT, socket_wrapper_dir(),
|
|
type, socket_wrapper_default_iface(), port);
|
|
if (stat(un_addr.sa.un.sun_path, &st) == 0) continue;
|
|
|
|
ret = libc_bind(fd, &un_addr.sa.s, un_addr.sa_socklen);
|
|
if (ret == -1) return ret;
|
|
|
|
si->un_addr = un_addr.sa.un;
|
|
|
|
si->bound = 1;
|
|
autobind_start = port + 1;
|
|
break;
|
|
}
|
|
if (i == SOCKET_MAX_SOCKETS) {
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "Too many open unix sockets (%u) for "
|
|
"interface "SOCKET_FORMAT,
|
|
SOCKET_MAX_SOCKETS,
|
|
type,
|
|
socket_wrapper_default_iface(),
|
|
0);
|
|
errno = ENFILE;
|
|
return -1;
|
|
}
|
|
|
|
si->family = family;
|
|
set_port(si->family, port, &si->myname);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* CONNECT
|
|
***************************************************************************/
|
|
|
|
static int swrap_connect(int s, const struct sockaddr *serv_addr,
|
|
socklen_t addrlen)
|
|
{
|
|
int ret;
|
|
struct swrap_address un_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
struct socket_info *si = find_socket_info(s);
|
|
int bcast = 0;
|
|
|
|
if (!si) {
|
|
return libc_connect(s, serv_addr, addrlen);
|
|
}
|
|
|
|
if (si->bound == 0) {
|
|
ret = swrap_auto_bind(s, si, serv_addr->sa_family);
|
|
if (ret == -1) return -1;
|
|
}
|
|
|
|
if (si->family != serv_addr->sa_family) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
ret = sockaddr_convert_to_un(si, serv_addr,
|
|
addrlen, &un_addr.sa.un, 0, &bcast);
|
|
if (ret == -1) return -1;
|
|
|
|
if (bcast) {
|
|
errno = ENETUNREACH;
|
|
return -1;
|
|
}
|
|
|
|
if (si->type == SOCK_DGRAM) {
|
|
si->defer_connect = 1;
|
|
ret = 0;
|
|
} else {
|
|
swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
|
|
|
|
ret = libc_connect(s,
|
|
&un_addr.sa.s,
|
|
un_addr.sa_socklen);
|
|
}
|
|
|
|
SWRAP_LOG(SWRAP_LOG_TRACE,
|
|
"connect() path=%s, fd=%d",
|
|
un_addr.sa.un.sun_path, s);
|
|
|
|
|
|
/* to give better errors */
|
|
if (ret == -1 && errno == ENOENT) {
|
|
errno = EHOSTUNREACH;
|
|
}
|
|
|
|
if (ret == 0) {
|
|
si->peername = (struct swrap_address) {
|
|
.sa_socklen = addrlen,
|
|
};
|
|
|
|
memcpy(&si->peername.sa.ss, serv_addr, addrlen);
|
|
si->connected = 1;
|
|
|
|
/*
|
|
* When we connect() on a socket than we have to bind the
|
|
* outgoing connection on the interface we use for the
|
|
* transport. We already bound it on the right interface
|
|
* but here we have to update the name so getsockname()
|
|
* returns correct information.
|
|
*/
|
|
if (si->bindname.sa_socklen > 0) {
|
|
si->myname = (struct swrap_address) {
|
|
.sa_socklen = si->bindname.sa_socklen,
|
|
};
|
|
|
|
memcpy(&si->myname.sa.ss,
|
|
&si->bindname.sa.ss,
|
|
si->bindname.sa_socklen);
|
|
|
|
/* Cleanup bindname */
|
|
si->bindname = (struct swrap_address) {
|
|
.sa_socklen = 0,
|
|
};
|
|
}
|
|
|
|
swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
|
|
swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
|
|
} else {
|
|
swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
|
|
{
|
|
return swrap_connect(s, serv_addr, addrlen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* BIND
|
|
***************************************************************************/
|
|
|
|
static int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
|
|
{
|
|
int ret;
|
|
struct swrap_address un_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
struct socket_info *si = find_socket_info(s);
|
|
int bind_error = 0;
|
|
#if 0 /* FIXME */
|
|
bool in_use;
|
|
#endif
|
|
|
|
if (!si) {
|
|
return libc_bind(s, myaddr, addrlen);
|
|
}
|
|
|
|
switch (si->family) {
|
|
case AF_INET: {
|
|
const struct sockaddr_in *sin;
|
|
if (addrlen < sizeof(struct sockaddr_in)) {
|
|
bind_error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
sin = (const struct sockaddr_in *)(const void *)myaddr;
|
|
|
|
if (sin->sin_family != AF_INET) {
|
|
bind_error = EAFNOSUPPORT;
|
|
}
|
|
|
|
/* special case for AF_UNSPEC */
|
|
if (sin->sin_family == AF_UNSPEC &&
|
|
(sin->sin_addr.s_addr == htonl(INADDR_ANY)))
|
|
{
|
|
bind_error = 0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6: {
|
|
const struct sockaddr_in6 *sin6;
|
|
if (addrlen < sizeof(struct sockaddr_in6)) {
|
|
bind_error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
sin6 = (const struct sockaddr_in6 *)(const void *)myaddr;
|
|
|
|
if (sin6->sin6_family != AF_INET6) {
|
|
bind_error = EAFNOSUPPORT;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
bind_error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (bind_error != 0) {
|
|
errno = bind_error;
|
|
return -1;
|
|
}
|
|
|
|
#if 0 /* FIXME */
|
|
in_use = check_addr_port_in_use(myaddr, addrlen);
|
|
if (in_use) {
|
|
errno = EADDRINUSE;
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
si->myname.sa_socklen = addrlen;
|
|
memcpy(&si->myname.sa.ss, myaddr, addrlen);
|
|
|
|
ret = sockaddr_convert_to_un(si,
|
|
myaddr,
|
|
addrlen,
|
|
&un_addr.sa.un,
|
|
1,
|
|
&si->bcast);
|
|
if (ret == -1) return -1;
|
|
|
|
unlink(un_addr.sa.un.sun_path);
|
|
|
|
ret = libc_bind(s, &un_addr.sa.s, un_addr.sa_socklen);
|
|
|
|
SWRAP_LOG(SWRAP_LOG_TRACE,
|
|
"bind() path=%s, fd=%d",
|
|
un_addr.sa.un.sun_path, s);
|
|
|
|
if (ret == 0) {
|
|
si->bound = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
|
|
{
|
|
return swrap_bind(s, myaddr, addrlen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* BINDRESVPORT
|
|
***************************************************************************/
|
|
|
|
#ifdef HAVE_BINDRESVPORT
|
|
static int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen);
|
|
|
|
static int swrap_bindresvport_sa(int sd, struct sockaddr *sa)
|
|
{
|
|
struct swrap_address myaddr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage),
|
|
};
|
|
socklen_t salen;
|
|
static uint16_t port;
|
|
uint16_t i;
|
|
int rc = -1;
|
|
int af;
|
|
|
|
#define SWRAP_STARTPORT 600
|
|
#define SWRAP_ENDPORT (IPPORT_RESERVED - 1)
|
|
#define SWRAP_NPORTS (SWRAP_ENDPORT - SWRAP_STARTPORT + 1)
|
|
|
|
if (port == 0) {
|
|
port = (getpid() % SWRAP_NPORTS) + SWRAP_STARTPORT;
|
|
}
|
|
|
|
if (sa == NULL) {
|
|
salen = myaddr.sa_socklen;
|
|
sa = &myaddr.sa.s;
|
|
|
|
rc = swrap_getsockname(sd, &myaddr.sa.s, &salen);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
|
|
af = sa->sa_family;
|
|
memset(&myaddr.sa.ss, 0, salen);
|
|
} else {
|
|
af = sa->sa_family;
|
|
}
|
|
|
|
for (i = 0; i < SWRAP_NPORTS; i++, port++) {
|
|
switch(af) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sinp = (struct sockaddr_in *)(void *)sa;
|
|
|
|
salen = sizeof(struct sockaddr_in);
|
|
sinp->sin_port = htons(port);
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sin6p = (struct sockaddr_in6 *)(void *)sa;
|
|
|
|
salen = sizeof(struct sockaddr_in6);
|
|
sin6p->sin6_port = htons(port);
|
|
break;
|
|
}
|
|
default:
|
|
errno = EAFNOSUPPORT;
|
|
return -1;
|
|
}
|
|
sa->sa_family = af;
|
|
|
|
if (port > SWRAP_ENDPORT) {
|
|
port = SWRAP_STARTPORT;
|
|
}
|
|
|
|
rc = swrap_bind(sd, (struct sockaddr *)sa, salen);
|
|
if (rc == 0 || errno != EADDRINUSE) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int bindresvport(int sockfd, struct sockaddr_in *sinp)
|
|
{
|
|
return swrap_bindresvport_sa(sockfd, (struct sockaddr *)sinp);
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* LISTEN
|
|
***************************************************************************/
|
|
|
|
static int swrap_listen(int s, int backlog)
|
|
{
|
|
int ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return libc_listen(s, backlog);
|
|
}
|
|
|
|
if (si->bound == 0) {
|
|
ret = swrap_auto_bind(s, si, si->family);
|
|
if (ret == -1) {
|
|
errno = EADDRINUSE;
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = libc_listen(s, backlog);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int listen(int s, int backlog)
|
|
{
|
|
return swrap_listen(s, backlog);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* FOPEN
|
|
***************************************************************************/
|
|
|
|
static FILE *swrap_fopen(const char *name, const char *mode)
|
|
{
|
|
FILE *fp;
|
|
|
|
fp = libc_fopen(name, mode);
|
|
if (fp != NULL) {
|
|
int fd = fileno(fp);
|
|
|
|
swrap_remove_stale(fd);
|
|
}
|
|
|
|
return fp;
|
|
}
|
|
|
|
FILE *fopen(const char *name, const char *mode)
|
|
{
|
|
return swrap_fopen(name, mode);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* OPEN
|
|
***************************************************************************/
|
|
|
|
static int swrap_vopen(const char *pathname, int flags, va_list ap)
|
|
{
|
|
int ret;
|
|
|
|
ret = libc_vopen(pathname, flags, ap);
|
|
if (ret != -1) {
|
|
/*
|
|
* There are methods for closing descriptors (libc-internal code
|
|
* paths, direct syscalls) which close descriptors in ways that
|
|
* we can't intercept, so try to recover when we notice that
|
|
* that's happened
|
|
*/
|
|
swrap_remove_stale(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int open(const char *pathname, int flags, ...)
|
|
{
|
|
va_list ap;
|
|
int fd;
|
|
|
|
va_start(ap, flags);
|
|
fd = swrap_vopen(pathname, flags, ap);
|
|
va_end(ap);
|
|
|
|
return fd;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* GETPEERNAME
|
|
***************************************************************************/
|
|
|
|
static int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
|
|
{
|
|
struct socket_info *si = find_socket_info(s);
|
|
socklen_t len;
|
|
|
|
if (!si) {
|
|
return libc_getpeername(s, name, addrlen);
|
|
}
|
|
|
|
if (si->peername.sa_socklen == 0)
|
|
{
|
|
errno = ENOTCONN;
|
|
return -1;
|
|
}
|
|
|
|
len = MIN(*addrlen, si->peername.sa_socklen);
|
|
if (len == 0) {
|
|
return 0;
|
|
}
|
|
|
|
memcpy(name, &si->peername.sa.ss, len);
|
|
*addrlen = si->peername.sa_socklen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_ACCEPT_PSOCKLEN_T
|
|
int getpeername(int s, struct sockaddr *name, Psocklen_t addrlen)
|
|
#else
|
|
int getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
|
|
#endif
|
|
{
|
|
return swrap_getpeername(s, name, (socklen_t *)addrlen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* GETSOCKNAME
|
|
***************************************************************************/
|
|
|
|
static int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
|
|
{
|
|
struct socket_info *si = find_socket_info(s);
|
|
socklen_t len;
|
|
|
|
if (!si) {
|
|
return libc_getsockname(s, name, addrlen);
|
|
}
|
|
|
|
len = MIN(*addrlen, si->myname.sa_socklen);
|
|
if (len == 0) {
|
|
return 0;
|
|
}
|
|
|
|
memcpy(name, &si->myname.sa.ss, len);
|
|
*addrlen = si->myname.sa_socklen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_ACCEPT_PSOCKLEN_T
|
|
int getsockname(int s, struct sockaddr *name, Psocklen_t addrlen)
|
|
#else
|
|
int getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
|
|
#endif
|
|
{
|
|
return swrap_getsockname(s, name, (socklen_t *)addrlen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* GETSOCKOPT
|
|
***************************************************************************/
|
|
|
|
#ifndef SO_PROTOCOL
|
|
# ifdef SO_PROTOTYPE /* The Solaris name */
|
|
# define SO_PROTOCOL SO_PROTOTYPE
|
|
# endif /* SO_PROTOTYPE */
|
|
#endif /* SO_PROTOCOL */
|
|
|
|
static int swrap_getsockopt(int s, int level, int optname,
|
|
void *optval, socklen_t *optlen)
|
|
{
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return libc_getsockopt(s,
|
|
level,
|
|
optname,
|
|
optval,
|
|
optlen);
|
|
}
|
|
|
|
if (level == SOL_SOCKET) {
|
|
switch (optname) {
|
|
#ifdef SO_DOMAIN
|
|
case SO_DOMAIN:
|
|
if (optval == NULL || optlen == NULL ||
|
|
*optlen < (socklen_t)sizeof(int)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
*optlen = sizeof(int);
|
|
*(int *)optval = si->family;
|
|
return 0;
|
|
#endif /* SO_DOMAIN */
|
|
|
|
#ifdef SO_PROTOCOL
|
|
case SO_PROTOCOL:
|
|
if (optval == NULL || optlen == NULL ||
|
|
*optlen < (socklen_t)sizeof(int)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
*optlen = sizeof(int);
|
|
*(int *)optval = si->protocol;
|
|
return 0;
|
|
#endif /* SO_PROTOCOL */
|
|
case SO_TYPE:
|
|
if (optval == NULL || optlen == NULL ||
|
|
*optlen < (socklen_t)sizeof(int)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
*optlen = sizeof(int);
|
|
*(int *)optval = si->type;
|
|
return 0;
|
|
default:
|
|
return libc_getsockopt(s,
|
|
level,
|
|
optname,
|
|
optval,
|
|
optlen);
|
|
}
|
|
} else if (level == IPPROTO_TCP) {
|
|
switch (optname) {
|
|
#ifdef TCP_NODELAY
|
|
case TCP_NODELAY:
|
|
/*
|
|
* This enables sending packets directly out over TCP.
|
|
* As a unix socket is doing that any way, report it as
|
|
* enabled.
|
|
*/
|
|
if (optval == NULL || optlen == NULL ||
|
|
*optlen < (socklen_t)sizeof(int)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
*optlen = sizeof(int);
|
|
*(int *)optval = si->tcp_nodelay;
|
|
|
|
return 0;
|
|
#endif /* TCP_NODELAY */
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
errno = ENOPROTOOPT;
|
|
return -1;
|
|
}
|
|
|
|
#ifdef HAVE_ACCEPT_PSOCKLEN_T
|
|
int getsockopt(int s, int level, int optname, void *optval, Psocklen_t optlen)
|
|
#else
|
|
int getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
|
|
#endif
|
|
{
|
|
return swrap_getsockopt(s, level, optname, optval, (socklen_t *)optlen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* SETSOCKOPT
|
|
***************************************************************************/
|
|
|
|
static int swrap_setsockopt(int s, int level, int optname,
|
|
const void *optval, socklen_t optlen)
|
|
{
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return libc_setsockopt(s,
|
|
level,
|
|
optname,
|
|
optval,
|
|
optlen);
|
|
}
|
|
|
|
if (level == SOL_SOCKET) {
|
|
return libc_setsockopt(s,
|
|
level,
|
|
optname,
|
|
optval,
|
|
optlen);
|
|
} else if (level == IPPROTO_TCP) {
|
|
switch (optname) {
|
|
#ifdef TCP_NODELAY
|
|
case TCP_NODELAY: {
|
|
int i;
|
|
|
|
/*
|
|
* This enables sending packets directly out over TCP.
|
|
* A unix socket is doing that any way.
|
|
*/
|
|
if (optval == NULL || optlen == 0 ||
|
|
optlen < (socklen_t)sizeof(int)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
i = *discard_const_p(int, optval);
|
|
if (i != 0 && i != 1) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
si->tcp_nodelay = i;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* TCP_NODELAY */
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch (si->family) {
|
|
case AF_INET:
|
|
if (level == IPPROTO_IP) {
|
|
#ifdef IP_PKTINFO
|
|
if (optname == IP_PKTINFO) {
|
|
si->pktinfo = AF_INET;
|
|
}
|
|
#endif /* IP_PKTINFO */
|
|
}
|
|
return 0;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
if (level == IPPROTO_IPV6) {
|
|
#ifdef IPV6_RECVPKTINFO
|
|
if (optname == IPV6_RECVPKTINFO) {
|
|
si->pktinfo = AF_INET6;
|
|
}
|
|
#endif /* IPV6_PKTINFO */
|
|
}
|
|
return 0;
|
|
#endif
|
|
default:
|
|
errno = ENOPROTOOPT;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int setsockopt(int s, int level, int optname,
|
|
const void *optval, socklen_t optlen)
|
|
{
|
|
return swrap_setsockopt(s, level, optname, optval, optlen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* IOCTL
|
|
***************************************************************************/
|
|
|
|
static int swrap_vioctl(int s, unsigned long int r, va_list va)
|
|
{
|
|
struct socket_info *si = find_socket_info(s);
|
|
va_list ap;
|
|
int value;
|
|
int rc;
|
|
|
|
if (!si) {
|
|
return libc_vioctl(s, r, va);
|
|
}
|
|
|
|
va_copy(ap, va);
|
|
|
|
rc = libc_vioctl(s, r, va);
|
|
|
|
switch (r) {
|
|
case FIONREAD:
|
|
value = *((int *)va_arg(ap, int *));
|
|
|
|
if (rc == -1 && errno != EAGAIN && errno != ENOBUFS) {
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
|
|
} else if (value == 0) { /* END OF FILE */
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
|
|
}
|
|
break;
|
|
}
|
|
|
|
va_end(ap);
|
|
|
|
return rc;
|
|
}
|
|
|
|
#ifdef HAVE_IOCTL_INT
|
|
int ioctl(int s, int r, ...)
|
|
#else
|
|
int ioctl(int s, unsigned long int r, ...)
|
|
#endif
|
|
{
|
|
va_list va;
|
|
int rc;
|
|
|
|
va_start(va, r);
|
|
|
|
rc = swrap_vioctl(s, (unsigned long int) r, va);
|
|
|
|
va_end(va);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*****************
|
|
* CMSG
|
|
*****************/
|
|
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
|
|
#ifndef CMSG_ALIGN
|
|
# ifdef _ALIGN /* BSD */
|
|
#define CMSG_ALIGN _ALIGN
|
|
# else
|
|
#define CMSG_ALIGN(len) (((len) + sizeof(size_t) - 1) & ~(sizeof(size_t) - 1))
|
|
# endif /* _ALIGN */
|
|
#endif /* CMSG_ALIGN */
|
|
|
|
/**
|
|
* @brief Add a cmsghdr to a msghdr.
|
|
*
|
|
* This is an function to add any type of cmsghdr. It will operate on the
|
|
* msg->msg_control and msg->msg_controllen you pass in by adapting them to
|
|
* the buffer position after the added cmsg element. Hence, this function is
|
|
* intended to be used with an intermediate msghdr and not on the original
|
|
* one handed in by the client.
|
|
*
|
|
* @param[in] msg The msghdr to which to add the cmsg.
|
|
*
|
|
* @param[in] level The cmsg level to set.
|
|
*
|
|
* @param[in] type The cmsg type to set.
|
|
*
|
|
* @param[in] data The cmsg data to set.
|
|
*
|
|
* @param[in] len the length of the data to set.
|
|
*/
|
|
static void swrap_msghdr_add_cmsghdr(struct msghdr *msg,
|
|
int level,
|
|
int type,
|
|
const void *data,
|
|
size_t len)
|
|
{
|
|
size_t cmlen = CMSG_LEN(len);
|
|
size_t cmspace = CMSG_SPACE(len);
|
|
uint8_t cmbuf[cmspace];
|
|
void *cast_ptr = (void *)cmbuf;
|
|
struct cmsghdr *cm = (struct cmsghdr *)cast_ptr;
|
|
uint8_t *p;
|
|
|
|
memset(cmbuf, 0, cmspace);
|
|
|
|
if (msg->msg_controllen < cmlen) {
|
|
cmlen = msg->msg_controllen;
|
|
msg->msg_flags |= MSG_CTRUNC;
|
|
}
|
|
|
|
if (msg->msg_controllen < cmspace) {
|
|
cmspace = msg->msg_controllen;
|
|
}
|
|
|
|
/*
|
|
* We copy the full input data into an intermediate cmsghdr first
|
|
* in order to more easily cope with truncation.
|
|
*/
|
|
cm->cmsg_len = cmlen;
|
|
cm->cmsg_level = level;
|
|
cm->cmsg_type = type;
|
|
memcpy(CMSG_DATA(cm), data, len);
|
|
|
|
/*
|
|
* We now copy the possibly truncated buffer.
|
|
* We copy cmlen bytes, but consume cmspace bytes,
|
|
* leaving the possible padding uninitialiazed.
|
|
*/
|
|
p = (uint8_t *)msg->msg_control;
|
|
memcpy(p, cm, cmlen);
|
|
p += cmspace;
|
|
msg->msg_control = p;
|
|
msg->msg_controllen -= cmspace;
|
|
|
|
return;
|
|
}
|
|
|
|
static int swrap_msghdr_add_pktinfo(struct socket_info *si,
|
|
struct msghdr *msg)
|
|
{
|
|
/* Add packet info */
|
|
switch (si->pktinfo) {
|
|
#if defined(IP_PKTINFO) && (defined(HAVE_STRUCT_IN_PKTINFO) || defined(IP_RECVDSTADDR))
|
|
case AF_INET: {
|
|
struct sockaddr_in *sin;
|
|
#if defined(HAVE_STRUCT_IN_PKTINFO)
|
|
struct in_pktinfo pkt;
|
|
#elif defined(IP_RECVDSTADDR)
|
|
struct in_addr pkt;
|
|
#endif
|
|
|
|
if (si->bindname.sa_socklen == sizeof(struct sockaddr_in)) {
|
|
sin = &si->bindname.sa.in;
|
|
} else {
|
|
if (si->myname.sa_socklen != sizeof(struct sockaddr_in)) {
|
|
return 0;
|
|
}
|
|
sin = &si->myname.sa.in;
|
|
}
|
|
|
|
ZERO_STRUCT(pkt);
|
|
|
|
#if defined(HAVE_STRUCT_IN_PKTINFO)
|
|
pkt.ipi_ifindex = socket_wrapper_default_iface();
|
|
pkt.ipi_addr.s_addr = sin->sin_addr.s_addr;
|
|
#elif defined(IP_RECVDSTADDR)
|
|
pkt = sin->sin_addr;
|
|
#endif
|
|
|
|
swrap_msghdr_add_cmsghdr(msg, IPPROTO_IP, IP_PKTINFO,
|
|
&pkt, sizeof(pkt));
|
|
|
|
break;
|
|
}
|
|
#endif /* IP_PKTINFO */
|
|
#if defined(HAVE_IPV6)
|
|
case AF_INET6: {
|
|
#if defined(IPV6_PKTINFO) && defined(HAVE_STRUCT_IN6_PKTINFO)
|
|
struct sockaddr_in6 *sin6;
|
|
struct in6_pktinfo pkt6;
|
|
|
|
if (si->bindname.sa_socklen == sizeof(struct sockaddr_in6)) {
|
|
sin6 = &si->bindname.sa.in6;
|
|
} else {
|
|
if (si->myname.sa_socklen != sizeof(struct sockaddr_in6)) {
|
|
return 0;
|
|
}
|
|
sin6 = &si->myname.sa.in6;
|
|
}
|
|
|
|
ZERO_STRUCT(pkt6);
|
|
|
|
pkt6.ipi6_ifindex = socket_wrapper_default_iface();
|
|
pkt6.ipi6_addr = sin6->sin6_addr;
|
|
|
|
swrap_msghdr_add_cmsghdr(msg, IPPROTO_IPV6, IPV6_PKTINFO,
|
|
&pkt6, sizeof(pkt6));
|
|
#endif /* HAVE_STRUCT_IN6_PKTINFO */
|
|
|
|
break;
|
|
}
|
|
#endif /* IPV6_PKTINFO */
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int swrap_msghdr_add_socket_info(struct socket_info *si,
|
|
struct msghdr *omsg)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (si->pktinfo > 0) {
|
|
rc = swrap_msghdr_add_pktinfo(si, omsg);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int swrap_sendmsg_copy_cmsg(struct cmsghdr *cmsg,
|
|
uint8_t **cm_data,
|
|
size_t *cm_data_space);
|
|
static int swrap_sendmsg_filter_cmsg_socket(struct cmsghdr *cmsg,
|
|
uint8_t **cm_data,
|
|
size_t *cm_data_space);
|
|
|
|
static int swrap_sendmsg_filter_cmsghdr(struct msghdr *msg,
|
|
uint8_t **cm_data,
|
|
size_t *cm_data_space) {
|
|
struct cmsghdr *cmsg;
|
|
int rc = -1;
|
|
|
|
/* Nothing to do */
|
|
if (msg->msg_controllen == 0 || msg->msg_control == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
for (cmsg = CMSG_FIRSTHDR(msg);
|
|
cmsg != NULL;
|
|
cmsg = CMSG_NXTHDR(msg, cmsg)) {
|
|
switch (cmsg->cmsg_level) {
|
|
case IPPROTO_IP:
|
|
rc = swrap_sendmsg_filter_cmsg_socket(cmsg,
|
|
cm_data,
|
|
cm_data_space);
|
|
break;
|
|
default:
|
|
rc = swrap_sendmsg_copy_cmsg(cmsg,
|
|
cm_data,
|
|
cm_data_space);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int swrap_sendmsg_copy_cmsg(struct cmsghdr *cmsg,
|
|
uint8_t **cm_data,
|
|
size_t *cm_data_space)
|
|
{
|
|
size_t cmspace;
|
|
uint8_t *p;
|
|
|
|
cmspace = *cm_data_space + CMSG_ALIGN(cmsg->cmsg_len);
|
|
|
|
p = realloc((*cm_data), cmspace);
|
|
if (p == NULL) {
|
|
return -1;
|
|
}
|
|
(*cm_data) = p;
|
|
|
|
p = (*cm_data) + (*cm_data_space);
|
|
*cm_data_space = cmspace;
|
|
|
|
memcpy(p, cmsg, cmsg->cmsg_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int swrap_sendmsg_filter_cmsg_pktinfo(struct cmsghdr *cmsg,
|
|
uint8_t **cm_data,
|
|
size_t *cm_data_space);
|
|
|
|
|
|
static int swrap_sendmsg_filter_cmsg_socket(struct cmsghdr *cmsg,
|
|
uint8_t **cm_data,
|
|
size_t *cm_data_space)
|
|
{
|
|
int rc = -1;
|
|
|
|
switch(cmsg->cmsg_type) {
|
|
#ifdef IP_PKTINFO
|
|
case IP_PKTINFO:
|
|
rc = swrap_sendmsg_filter_cmsg_pktinfo(cmsg,
|
|
cm_data,
|
|
cm_data_space);
|
|
break;
|
|
#endif
|
|
#ifdef IPV6_PKTINFO
|
|
case IPV6_PKTINFO:
|
|
rc = swrap_sendmsg_filter_cmsg_pktinfo(cmsg,
|
|
cm_data,
|
|
cm_data_space);
|
|
break;
|
|
#endif
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int swrap_sendmsg_filter_cmsg_pktinfo(struct cmsghdr *cmsg,
|
|
uint8_t **cm_data,
|
|
size_t *cm_data_space)
|
|
{
|
|
(void)cmsg; /* unused */
|
|
(void)cm_data; /* unused */
|
|
(void)cm_data_space; /* unused */
|
|
|
|
/*
|
|
* Passing a IP pktinfo to a unix socket might be rejected by the
|
|
* Kernel, at least on FreeBSD. So skip this cmsg.
|
|
*/
|
|
return 0;
|
|
}
|
|
#endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */
|
|
|
|
static ssize_t swrap_sendmsg_before(int fd,
|
|
struct socket_info *si,
|
|
struct msghdr *msg,
|
|
struct iovec *tmp_iov,
|
|
struct sockaddr_un *tmp_un,
|
|
const struct sockaddr_un **to_un,
|
|
const struct sockaddr **to,
|
|
int *bcast)
|
|
{
|
|
size_t i, len = 0;
|
|
ssize_t ret;
|
|
|
|
if (to_un) {
|
|
*to_un = NULL;
|
|
}
|
|
if (to) {
|
|
*to = NULL;
|
|
}
|
|
if (bcast) {
|
|
*bcast = 0;
|
|
}
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM: {
|
|
unsigned long mtu;
|
|
|
|
if (!si->connected) {
|
|
errno = ENOTCONN;
|
|
return -1;
|
|
}
|
|
|
|
if (msg->msg_iovlen == 0) {
|
|
break;
|
|
}
|
|
|
|
mtu = socket_wrapper_mtu();
|
|
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
|
|
size_t nlen;
|
|
nlen = len + msg->msg_iov[i].iov_len;
|
|
if (nlen > mtu) {
|
|
break;
|
|
}
|
|
}
|
|
msg->msg_iovlen = i;
|
|
if (msg->msg_iovlen == 0) {
|
|
*tmp_iov = msg->msg_iov[0];
|
|
tmp_iov->iov_len = MIN((size_t)tmp_iov->iov_len,
|
|
(size_t)mtu);
|
|
msg->msg_iov = tmp_iov;
|
|
msg->msg_iovlen = 1;
|
|
}
|
|
break;
|
|
}
|
|
case SOCK_DGRAM:
|
|
if (si->connected) {
|
|
if (msg->msg_name != NULL) {
|
|
/*
|
|
* We are dealing with unix sockets and if we
|
|
* are connected, we should only talk to the
|
|
* connected unix path. Using the fd to send
|
|
* to another server would be hard to achieve.
|
|
*/
|
|
msg->msg_name = NULL;
|
|
msg->msg_namelen = 0;
|
|
}
|
|
} else {
|
|
const struct sockaddr *msg_name;
|
|
msg_name = (const struct sockaddr *)msg->msg_name;
|
|
|
|
if (msg_name == NULL) {
|
|
errno = ENOTCONN;
|
|
return -1;
|
|
}
|
|
|
|
|
|
ret = sockaddr_convert_to_un(si, msg_name, msg->msg_namelen,
|
|
tmp_un, 0, bcast);
|
|
if (ret == -1) return -1;
|
|
|
|
if (to_un) {
|
|
*to_un = tmp_un;
|
|
}
|
|
if (to) {
|
|
*to = msg_name;
|
|
}
|
|
msg->msg_name = tmp_un;
|
|
msg->msg_namelen = sizeof(*tmp_un);
|
|
}
|
|
|
|
if (si->bound == 0) {
|
|
ret = swrap_auto_bind(fd, si, si->family);
|
|
if (ret == -1) {
|
|
if (errno == ENOTSOCK) {
|
|
swrap_remove_stale(fd);
|
|
return -ENOTSOCK;
|
|
} else {
|
|
SWRAP_LOG(SWRAP_LOG_ERROR, "swrap_sendmsg_before failed");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!si->defer_connect) {
|
|
break;
|
|
}
|
|
|
|
ret = sockaddr_convert_to_un(si,
|
|
&si->peername.sa.s,
|
|
si->peername.sa_socklen,
|
|
tmp_un,
|
|
0,
|
|
NULL);
|
|
if (ret == -1) return -1;
|
|
|
|
ret = libc_connect(fd,
|
|
(struct sockaddr *)(void *)tmp_un,
|
|
sizeof(*tmp_un));
|
|
|
|
/* to give better errors */
|
|
if (ret == -1 && errno == ENOENT) {
|
|
errno = EHOSTUNREACH;
|
|
}
|
|
|
|
if (ret == -1) {
|
|
return ret;
|
|
}
|
|
|
|
si->defer_connect = 0;
|
|
break;
|
|
default:
|
|
errno = EHOSTUNREACH;
|
|
return -1;
|
|
}
|
|
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
if (msg->msg_controllen > 0 && msg->msg_control != NULL) {
|
|
uint8_t *cmbuf = NULL;
|
|
size_t cmlen = 0;
|
|
|
|
ret = swrap_sendmsg_filter_cmsghdr(msg, &cmbuf, &cmlen);
|
|
if (ret < 0) {
|
|
free(cmbuf);
|
|
return -1;
|
|
}
|
|
|
|
if (cmlen == 0) {
|
|
msg->msg_controllen = 0;
|
|
msg->msg_control = NULL;
|
|
} else if (cmlen < msg->msg_controllen && cmbuf != NULL) {
|
|
memcpy(msg->msg_control, cmbuf, cmlen);
|
|
msg->msg_controllen = cmlen;
|
|
}
|
|
free(cmbuf);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void swrap_sendmsg_after(int fd,
|
|
struct socket_info *si,
|
|
struct msghdr *msg,
|
|
const struct sockaddr *to,
|
|
ssize_t ret)
|
|
{
|
|
int saved_errno = errno;
|
|
size_t i, len = 0;
|
|
uint8_t *buf;
|
|
off_t ofs = 0;
|
|
size_t avail = 0;
|
|
size_t remain;
|
|
|
|
/* to give better errors */
|
|
if (ret == -1) {
|
|
if (saved_errno == ENOENT) {
|
|
saved_errno = EHOSTUNREACH;
|
|
} else if (saved_errno == ENOTSOCK) {
|
|
/* If the fd is not a socket, remove it */
|
|
swrap_remove_stale(fd);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
|
|
avail += msg->msg_iov[i].iov_len;
|
|
}
|
|
|
|
if (ret == -1) {
|
|
remain = MIN(80, avail);
|
|
} else {
|
|
remain = ret;
|
|
}
|
|
|
|
/* we capture it as one single packet */
|
|
buf = (uint8_t *)malloc(remain);
|
|
if (!buf) {
|
|
/* we just not capture the packet */
|
|
errno = saved_errno;
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
|
|
size_t this_time = MIN(remain, (size_t)msg->msg_iov[i].iov_len);
|
|
memcpy(buf + ofs,
|
|
msg->msg_iov[i].iov_base,
|
|
this_time);
|
|
ofs += this_time;
|
|
remain -= this_time;
|
|
}
|
|
len = ofs;
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
if (ret == -1) {
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
|
|
} else {
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
|
|
}
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
if (si->connected) {
|
|
to = &si->peername.sa.s;
|
|
}
|
|
if (ret == -1) {
|
|
swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
swrap_pcap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
|
|
} else {
|
|
swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
}
|
|
break;
|
|
}
|
|
|
|
free(buf);
|
|
errno = saved_errno;
|
|
}
|
|
|
|
static int swrap_recvmsg_before(int fd,
|
|
struct socket_info *si,
|
|
struct msghdr *msg,
|
|
struct iovec *tmp_iov)
|
|
{
|
|
size_t i, len = 0;
|
|
ssize_t ret;
|
|
|
|
(void)fd; /* unused */
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM: {
|
|
unsigned int mtu;
|
|
if (!si->connected) {
|
|
errno = ENOTCONN;
|
|
return -1;
|
|
}
|
|
|
|
if (msg->msg_iovlen == 0) {
|
|
break;
|
|
}
|
|
|
|
mtu = socket_wrapper_mtu();
|
|
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
|
|
size_t nlen;
|
|
nlen = len + msg->msg_iov[i].iov_len;
|
|
if (nlen > mtu) {
|
|
break;
|
|
}
|
|
}
|
|
msg->msg_iovlen = i;
|
|
if (msg->msg_iovlen == 0) {
|
|
*tmp_iov = msg->msg_iov[0];
|
|
tmp_iov->iov_len = MIN((size_t)tmp_iov->iov_len,
|
|
(size_t)mtu);
|
|
msg->msg_iov = tmp_iov;
|
|
msg->msg_iovlen = 1;
|
|
}
|
|
break;
|
|
}
|
|
case SOCK_DGRAM:
|
|
if (msg->msg_name == NULL) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (msg->msg_iovlen == 0) {
|
|
break;
|
|
}
|
|
|
|
if (si->bound == 0) {
|
|
ret = swrap_auto_bind(fd, si, si->family);
|
|
if (ret == -1) {
|
|
/*
|
|
* When attempting to read or write to a
|
|
* descriptor, if an underlying autobind fails
|
|
* because it's not a socket, stop intercepting
|
|
* uses of that descriptor.
|
|
*/
|
|
if (errno == ENOTSOCK) {
|
|
swrap_remove_stale(fd);
|
|
return -ENOTSOCK;
|
|
} else {
|
|
SWRAP_LOG(SWRAP_LOG_ERROR,
|
|
"swrap_recvmsg_before failed");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
errno = EHOSTUNREACH;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int swrap_recvmsg_after(int fd,
|
|
struct socket_info *si,
|
|
struct msghdr *msg,
|
|
const struct sockaddr_un *un_addr,
|
|
socklen_t un_addrlen,
|
|
ssize_t ret)
|
|
{
|
|
int saved_errno = errno;
|
|
size_t i;
|
|
uint8_t *buf = NULL;
|
|
off_t ofs = 0;
|
|
size_t avail = 0;
|
|
size_t remain;
|
|
int rc;
|
|
|
|
/* to give better errors */
|
|
if (ret == -1) {
|
|
if (saved_errno == ENOENT) {
|
|
saved_errno = EHOSTUNREACH;
|
|
} else if (saved_errno == ENOTSOCK) {
|
|
/* If the fd is not a socket, remove it */
|
|
swrap_remove_stale(fd);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
|
|
avail += msg->msg_iov[i].iov_len;
|
|
}
|
|
|
|
/* Convert the socket address before we leave */
|
|
if (si->type == SOCK_DGRAM && un_addr != NULL) {
|
|
rc = sockaddr_convert_from_un(si,
|
|
un_addr,
|
|
un_addrlen,
|
|
si->family,
|
|
msg->msg_name,
|
|
&msg->msg_namelen);
|
|
if (rc == -1) {
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (avail == 0) {
|
|
rc = 0;
|
|
goto done;
|
|
}
|
|
|
|
if (ret == -1) {
|
|
remain = MIN(80, avail);
|
|
} else {
|
|
remain = ret;
|
|
}
|
|
|
|
/* we capture it as one single packet */
|
|
buf = (uint8_t *)malloc(remain);
|
|
if (buf == NULL) {
|
|
/* we just not capture the packet */
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
|
|
size_t this_time = MIN(remain, (size_t)msg->msg_iov[i].iov_len);
|
|
memcpy(buf + ofs,
|
|
msg->msg_iov[i].iov_base,
|
|
this_time);
|
|
ofs += this_time;
|
|
remain -= this_time;
|
|
}
|
|
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
if (ret == -1 && saved_errno != EAGAIN && saved_errno != ENOBUFS) {
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret == 0) { /* END OF FILE */
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret > 0) {
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
|
|
}
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
if (ret == -1) {
|
|
break;
|
|
}
|
|
|
|
if (un_addr != NULL) {
|
|
swrap_pcap_dump_packet(si,
|
|
msg->msg_name,
|
|
SWRAP_RECVFROM,
|
|
buf,
|
|
ret);
|
|
} else {
|
|
swrap_pcap_dump_packet(si,
|
|
msg->msg_name,
|
|
SWRAP_RECV,
|
|
buf,
|
|
ret);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
rc = 0;
|
|
done:
|
|
free(buf);
|
|
errno = saved_errno;
|
|
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
if (rc == 0 &&
|
|
msg->msg_controllen > 0 &&
|
|
msg->msg_control != NULL) {
|
|
rc = swrap_msghdr_add_socket_info(si, msg);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return rc;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* RECVFROM
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags,
|
|
struct sockaddr *from, socklen_t *fromlen)
|
|
{
|
|
struct swrap_address from_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
ssize_t ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
struct swrap_address saddr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage),
|
|
};
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
int tret;
|
|
|
|
if (!si) {
|
|
return libc_recvfrom(s,
|
|
buf,
|
|
len,
|
|
flags,
|
|
from,
|
|
fromlen);
|
|
}
|
|
|
|
tmp.iov_base = buf;
|
|
tmp.iov_len = len;
|
|
|
|
ZERO_STRUCT(msg);
|
|
if (from != NULL && fromlen != NULL) {
|
|
msg.msg_name = from; /* optional address */
|
|
msg.msg_namelen = *fromlen; /* size of address */
|
|
} else {
|
|
msg.msg_name = &saddr.sa.s; /* optional address */
|
|
msg.msg_namelen = saddr.sa_socklen; /* size of address */
|
|
}
|
|
msg.msg_iov = &tmp; /* scatter/gather array */
|
|
msg.msg_iovlen = 1; /* # elements in msg_iov */
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
tret = swrap_recvmsg_before(s, si, &msg, &tmp);
|
|
if (tret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
buf = msg.msg_iov[0].iov_base;
|
|
len = msg.msg_iov[0].iov_len;
|
|
|
|
ret = libc_recvfrom(s,
|
|
buf,
|
|
len,
|
|
flags,
|
|
&from_addr.sa.s,
|
|
&from_addr.sa_socklen);
|
|
if (ret == -1) {
|
|
return ret;
|
|
}
|
|
|
|
tret = swrap_recvmsg_after(s,
|
|
si,
|
|
&msg,
|
|
&from_addr.sa.un,
|
|
from_addr.sa_socklen,
|
|
ret);
|
|
if (tret != 0) {
|
|
return tret;
|
|
}
|
|
|
|
if (from != NULL && fromlen != NULL) {
|
|
*fromlen = msg.msg_namelen;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef HAVE_ACCEPT_PSOCKLEN_T
|
|
ssize_t recvfrom(int s, void *buf, size_t len, int flags,
|
|
struct sockaddr *from, Psocklen_t fromlen)
|
|
#else
|
|
ssize_t recvfrom(int s, void *buf, size_t len, int flags,
|
|
struct sockaddr *from, socklen_t *fromlen)
|
|
#endif
|
|
{
|
|
return swrap_recvfrom(s, buf, len, flags, from, (socklen_t *)fromlen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* SENDTO
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags,
|
|
const struct sockaddr *to, socklen_t tolen)
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct swrap_address un_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
const struct sockaddr_un *to_un = NULL;
|
|
ssize_t ret;
|
|
int rc;
|
|
struct socket_info *si = find_socket_info(s);
|
|
int bcast = 0;
|
|
|
|
if (!si) {
|
|
return libc_sendto(s, buf, len, flags, to, tolen);
|
|
}
|
|
|
|
tmp.iov_base = discard_const_p(char, buf);
|
|
tmp.iov_len = len;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = discard_const_p(struct sockaddr, to); /* optional address */
|
|
msg.msg_namelen = tolen; /* size of address */
|
|
msg.msg_iov = &tmp; /* scatter/gather array */
|
|
msg.msg_iovlen = 1; /* # elements in msg_iov */
|
|
#if HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
rc = swrap_sendmsg_before(s,
|
|
si,
|
|
&msg,
|
|
&tmp,
|
|
&un_addr.sa.un,
|
|
&to_un,
|
|
&to,
|
|
&bcast);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
|
|
buf = msg.msg_iov[0].iov_base;
|
|
len = msg.msg_iov[0].iov_len;
|
|
|
|
if (bcast) {
|
|
struct stat st;
|
|
unsigned int iface;
|
|
unsigned int prt = ntohs(((const struct sockaddr_in *)(const void *)to)->sin_port);
|
|
char type;
|
|
|
|
type = SOCKET_TYPE_CHAR_UDP;
|
|
|
|
for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
|
|
snprintf(un_addr.sa.un.sun_path,
|
|
sizeof(un_addr.sa.un.sun_path),
|
|
"%s/"SOCKET_FORMAT,
|
|
socket_wrapper_dir(), type, iface, prt);
|
|
if (stat(un_addr.sa.un.sun_path, &st) != 0) continue;
|
|
|
|
/* ignore the any errors in broadcast sends */
|
|
libc_sendto(s,
|
|
buf,
|
|
len,
|
|
flags,
|
|
&un_addr.sa.s,
|
|
un_addr.sa_socklen);
|
|
}
|
|
|
|
swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* If it is a dgram socket and we are connected, don't include the
|
|
* 'to' address.
|
|
*/
|
|
if (si->type == SOCK_DGRAM && si->connected) {
|
|
ret = libc_sendto(s,
|
|
buf,
|
|
len,
|
|
flags,
|
|
NULL,
|
|
0);
|
|
} else {
|
|
ret = libc_sendto(s,
|
|
buf,
|
|
len,
|
|
flags,
|
|
(struct sockaddr *)msg.msg_name,
|
|
msg.msg_namelen);
|
|
}
|
|
|
|
swrap_sendmsg_after(s, si, &msg, to, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t sendto(int s, const void *buf, size_t len, int flags,
|
|
const struct sockaddr *to, socklen_t tolen)
|
|
{
|
|
return swrap_sendto(s, buf, len, flags, to, tolen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* READV
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
|
|
{
|
|
struct socket_info *si;
|
|
struct msghdr msg;
|
|
struct swrap_address saddr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage),
|
|
};
|
|
struct iovec tmp;
|
|
ssize_t ret;
|
|
int tret;
|
|
|
|
si = find_socket_info(s);
|
|
if (si == NULL) {
|
|
return libc_recv(s, buf, len, flags);
|
|
}
|
|
|
|
tmp.iov_base = buf;
|
|
tmp.iov_len = len;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = &saddr.sa.s; /* optional address */
|
|
msg.msg_namelen = saddr.sa_socklen; /* size of address */
|
|
msg.msg_iov = &tmp; /* scatter/gather array */
|
|
msg.msg_iovlen = 1; /* # elements in msg_iov */
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
tret = swrap_recvmsg_before(s, si, &msg, &tmp);
|
|
if (tret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
buf = msg.msg_iov[0].iov_base;
|
|
len = msg.msg_iov[0].iov_len;
|
|
|
|
ret = libc_recv(s, buf, len, flags);
|
|
|
|
tret = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret);
|
|
if (tret != 0) {
|
|
return tret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t recv(int s, void *buf, size_t len, int flags)
|
|
{
|
|
return swrap_recv(s, buf, len, flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* READ
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_read(int s, void *buf, size_t len)
|
|
{
|
|
struct socket_info *si;
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct swrap_address saddr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage),
|
|
};
|
|
ssize_t ret;
|
|
int tret;
|
|
|
|
si = find_socket_info(s);
|
|
if (si == NULL) {
|
|
return libc_read(s, buf, len);
|
|
}
|
|
|
|
tmp.iov_base = buf;
|
|
tmp.iov_len = len;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = &saddr.sa.ss; /* optional address */
|
|
msg.msg_namelen = saddr.sa_socklen; /* size of address */
|
|
msg.msg_iov = &tmp; /* scatter/gather array */
|
|
msg.msg_iovlen = 1; /* # elements in msg_iov */
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
tret = swrap_recvmsg_before(s, si, &msg, &tmp);
|
|
if (tret < 0) {
|
|
if (tret == -ENOTSOCK) {
|
|
return libc_read(s, buf, len);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
buf = msg.msg_iov[0].iov_base;
|
|
len = msg.msg_iov[0].iov_len;
|
|
|
|
ret = libc_read(s, buf, len);
|
|
|
|
tret = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret);
|
|
if (tret != 0) {
|
|
return tret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t read(int s, void *buf, size_t len)
|
|
{
|
|
return swrap_read(s, buf, len);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* WRITE
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_write(int s, const void *buf, size_t len)
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct sockaddr_un un_addr;
|
|
ssize_t ret;
|
|
int rc;
|
|
struct socket_info *si;
|
|
|
|
si = find_socket_info(s);
|
|
if (si == NULL) {
|
|
return libc_write(s, buf, len);
|
|
}
|
|
|
|
tmp.iov_base = discard_const_p(char, buf);
|
|
tmp.iov_len = len;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = NULL; /* optional address */
|
|
msg.msg_namelen = 0; /* size of address */
|
|
msg.msg_iov = &tmp; /* scatter/gather array */
|
|
msg.msg_iovlen = 1; /* # elements in msg_iov */
|
|
#if HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
|
|
buf = msg.msg_iov[0].iov_base;
|
|
len = msg.msg_iov[0].iov_len;
|
|
|
|
ret = libc_write(s, buf, len);
|
|
|
|
swrap_sendmsg_after(s, si, &msg, NULL, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t write(int s, const void *buf, size_t len)
|
|
{
|
|
return swrap_write(s, buf, len);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* SEND
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct sockaddr_un un_addr;
|
|
ssize_t ret;
|
|
int rc;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return libc_send(s, buf, len, flags);
|
|
}
|
|
|
|
tmp.iov_base = discard_const_p(char, buf);
|
|
tmp.iov_len = len;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = NULL; /* optional address */
|
|
msg.msg_namelen = 0; /* size of address */
|
|
msg.msg_iov = &tmp; /* scatter/gather array */
|
|
msg.msg_iovlen = 1; /* # elements in msg_iov */
|
|
#if HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
|
|
buf = msg.msg_iov[0].iov_base;
|
|
len = msg.msg_iov[0].iov_len;
|
|
|
|
ret = libc_send(s, buf, len, flags);
|
|
|
|
swrap_sendmsg_after(s, si, &msg, NULL, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t send(int s, const void *buf, size_t len, int flags)
|
|
{
|
|
return swrap_send(s, buf, len, flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* RECVMSG
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_recvmsg(int s, struct msghdr *omsg, int flags)
|
|
{
|
|
struct swrap_address from_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_un),
|
|
};
|
|
struct swrap_address convert_addr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage),
|
|
};
|
|
struct socket_info *si;
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
size_t msg_ctrllen_filled;
|
|
size_t msg_ctrllen_left;
|
|
#endif
|
|
|
|
ssize_t ret;
|
|
int rc;
|
|
|
|
si = find_socket_info(s);
|
|
if (si == NULL) {
|
|
return libc_recvmsg(s, omsg, flags);
|
|
}
|
|
|
|
tmp.iov_base = NULL;
|
|
tmp.iov_len = 0;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = &from_addr.sa; /* optional address */
|
|
msg.msg_namelen = from_addr.sa_socklen; /* size of address */
|
|
msg.msg_iov = omsg->msg_iov; /* scatter/gather array */
|
|
msg.msg_iovlen = omsg->msg_iovlen; /* # elements in msg_iov */
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg_ctrllen_filled = 0;
|
|
msg_ctrllen_left = omsg->msg_controllen;
|
|
|
|
msg.msg_control = omsg->msg_control; /* ancillary data, see below */
|
|
msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */
|
|
msg.msg_flags = omsg->msg_flags; /* flags on received message */
|
|
#endif
|
|
|
|
rc = swrap_recvmsg_before(s, si, &msg, &tmp);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
|
|
ret = libc_recvmsg(s, &msg, flags);
|
|
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg_ctrllen_filled += msg.msg_controllen;
|
|
msg_ctrllen_left -= msg.msg_controllen;
|
|
|
|
if (omsg->msg_control != NULL) {
|
|
uint8_t *p;
|
|
|
|
p = omsg->msg_control;
|
|
p += msg_ctrllen_filled;
|
|
|
|
msg.msg_control = p;
|
|
msg.msg_controllen = msg_ctrllen_left;
|
|
} else {
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* We convert the unix address to a IP address so we need a buffer
|
|
* which can store the address in case of SOCK_DGRAM, see below.
|
|
*/
|
|
msg.msg_name = &convert_addr.sa;
|
|
msg.msg_namelen = convert_addr.sa_socklen;
|
|
|
|
rc = swrap_recvmsg_after(s,
|
|
si,
|
|
&msg,
|
|
&from_addr.sa.un,
|
|
from_addr.sa_socklen,
|
|
ret);
|
|
if (rc != 0) {
|
|
return rc;
|
|
}
|
|
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
if (omsg->msg_control != NULL) {
|
|
/* msg.msg_controllen = space left */
|
|
msg_ctrllen_left = msg.msg_controllen;
|
|
msg_ctrllen_filled = omsg->msg_controllen - msg_ctrllen_left;
|
|
}
|
|
|
|
/* Update the original message length */
|
|
omsg->msg_controllen = msg_ctrllen_filled;
|
|
omsg->msg_flags = msg.msg_flags;
|
|
#endif
|
|
omsg->msg_iovlen = msg.msg_iovlen;
|
|
|
|
/*
|
|
* From the manpage:
|
|
*
|
|
* The msg_name field points to a caller-allocated buffer that is
|
|
* used to return the source address if the socket is unconnected. The
|
|
* caller should set msg_namelen to the size of this buffer before this
|
|
* call; upon return from a successful call, msg_name will contain the
|
|
* length of the returned address. If the application does not need
|
|
* to know the source address, msg_name can be specified as NULL.
|
|
*/
|
|
if (si->type == SOCK_STREAM) {
|
|
omsg->msg_namelen = 0;
|
|
} else if (omsg->msg_name != NULL &&
|
|
omsg->msg_namelen != 0 &&
|
|
omsg->msg_namelen >= msg.msg_namelen) {
|
|
memcpy(omsg->msg_name, msg.msg_name, msg.msg_namelen);
|
|
omsg->msg_namelen = msg.msg_namelen;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags)
|
|
{
|
|
return swrap_recvmsg(sockfd, msg, flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* SENDMSG
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_sendmsg(int s, const struct msghdr *omsg, int flags)
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct sockaddr_un un_addr;
|
|
const struct sockaddr_un *to_un = NULL;
|
|
const struct sockaddr *to = NULL;
|
|
ssize_t ret;
|
|
int rc;
|
|
struct socket_info *si = find_socket_info(s);
|
|
int bcast = 0;
|
|
|
|
if (!si) {
|
|
return libc_sendmsg(s, omsg, flags);
|
|
}
|
|
|
|
ZERO_STRUCT(un_addr);
|
|
|
|
tmp.iov_base = NULL;
|
|
tmp.iov_len = 0;
|
|
|
|
ZERO_STRUCT(msg);
|
|
|
|
if (si->connected == 0) {
|
|
msg.msg_name = omsg->msg_name; /* optional address */
|
|
msg.msg_namelen = omsg->msg_namelen; /* size of address */
|
|
}
|
|
msg.msg_iov = omsg->msg_iov; /* scatter/gather array */
|
|
msg.msg_iovlen = omsg->msg_iovlen; /* # elements in msg_iov */
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
if (msg.msg_controllen > 0 && msg.msg_control != NULL) {
|
|
/* omsg is a const so use a local buffer for modifications */
|
|
uint8_t cmbuf[omsg->msg_controllen];
|
|
|
|
memcpy(cmbuf, omsg->msg_control, omsg->msg_controllen);
|
|
|
|
msg.msg_control = cmbuf; /* ancillary data, see below */
|
|
msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */
|
|
}
|
|
msg.msg_flags = omsg->msg_flags; /* flags on received message */
|
|
#endif
|
|
|
|
rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (bcast) {
|
|
struct stat st;
|
|
unsigned int iface;
|
|
unsigned int prt = ntohs(((const struct sockaddr_in *)(const void *)to)->sin_port);
|
|
char type;
|
|
size_t i, len = 0;
|
|
uint8_t *buf;
|
|
off_t ofs = 0;
|
|
size_t avail = 0;
|
|
size_t remain;
|
|
|
|
for (i = 0; i < (size_t)msg.msg_iovlen; i++) {
|
|
avail += msg.msg_iov[i].iov_len;
|
|
}
|
|
|
|
len = avail;
|
|
remain = avail;
|
|
|
|
/* we capture it as one single packet */
|
|
buf = (uint8_t *)malloc(remain);
|
|
if (!buf) {
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < (size_t)msg.msg_iovlen; i++) {
|
|
size_t this_time = MIN(remain, (size_t)msg.msg_iov[i].iov_len);
|
|
memcpy(buf + ofs,
|
|
msg.msg_iov[i].iov_base,
|
|
this_time);
|
|
ofs += this_time;
|
|
remain -= this_time;
|
|
}
|
|
|
|
type = SOCKET_TYPE_CHAR_UDP;
|
|
|
|
for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
|
|
snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
|
|
socket_wrapper_dir(), type, iface, prt);
|
|
if (stat(un_addr.sun_path, &st) != 0) continue;
|
|
|
|
msg.msg_name = &un_addr; /* optional address */
|
|
msg.msg_namelen = sizeof(un_addr); /* size of address */
|
|
|
|
/* ignore the any errors in broadcast sends */
|
|
libc_sendmsg(s, &msg, flags);
|
|
}
|
|
|
|
swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
free(buf);
|
|
|
|
return len;
|
|
}
|
|
|
|
ret = libc_sendmsg(s, &msg, flags);
|
|
|
|
swrap_sendmsg_after(s, si, &msg, to, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t sendmsg(int s, const struct msghdr *omsg, int flags)
|
|
{
|
|
return swrap_sendmsg(s, omsg, flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* READV
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_readv(int s, const struct iovec *vector, int count)
|
|
{
|
|
struct socket_info *si;
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct swrap_address saddr = {
|
|
.sa_socklen = sizeof(struct sockaddr_storage)
|
|
};
|
|
ssize_t ret;
|
|
int rc;
|
|
|
|
si = find_socket_info(s);
|
|
if (si == NULL) {
|
|
return libc_readv(s, vector, count);
|
|
}
|
|
|
|
tmp.iov_base = NULL;
|
|
tmp.iov_len = 0;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = &saddr.sa.s; /* optional address */
|
|
msg.msg_namelen = saddr.sa_socklen; /* size of address */
|
|
msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */
|
|
msg.msg_iovlen = count; /* # elements in msg_iov */
|
|
#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
rc = swrap_recvmsg_before(s, si, &msg, &tmp);
|
|
if (rc < 0) {
|
|
if (rc == -ENOTSOCK) {
|
|
return libc_readv(s, vector, count);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
ret = libc_readv(s, msg.msg_iov, msg.msg_iovlen);
|
|
|
|
rc = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret);
|
|
if (rc != 0) {
|
|
return rc;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t readv(int s, const struct iovec *vector, int count)
|
|
{
|
|
return swrap_readv(s, vector, count);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* WRITEV
|
|
***************************************************************************/
|
|
|
|
static ssize_t swrap_writev(int s, const struct iovec *vector, int count)
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct sockaddr_un un_addr;
|
|
ssize_t ret;
|
|
int rc;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return libc_writev(s, vector, count);
|
|
}
|
|
|
|
tmp.iov_base = NULL;
|
|
tmp.iov_len = 0;
|
|
|
|
ZERO_STRUCT(msg);
|
|
msg.msg_name = NULL; /* optional address */
|
|
msg.msg_namelen = 0; /* size of address */
|
|
msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */
|
|
msg.msg_iovlen = count; /* # elements in msg_iov */
|
|
#if HAVE_STRUCT_MSGHDR_MSG_CONTROL
|
|
msg.msg_control = NULL; /* ancillary data, see below */
|
|
msg.msg_controllen = 0; /* ancillary data buffer len */
|
|
msg.msg_flags = 0; /* flags on received message */
|
|
#endif
|
|
|
|
rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
|
|
if (rc < 0) {
|
|
if (rc == -ENOTSOCK) {
|
|
return libc_readv(s, vector, count);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
ret = libc_writev(s, msg.msg_iov, msg.msg_iovlen);
|
|
|
|
swrap_sendmsg_after(s, si, &msg, NULL, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t writev(int s, const struct iovec *vector, int count)
|
|
{
|
|
return swrap_writev(s, vector, count);
|
|
}
|
|
|
|
/****************************
|
|
* CLOSE
|
|
***************************/
|
|
|
|
static int swrap_close(int fd)
|
|
{
|
|
struct socket_info *si = find_socket_info(fd);
|
|
struct socket_info_fd *fi;
|
|
int ret;
|
|
|
|
if (!si) {
|
|
return libc_close(fd);
|
|
}
|
|
|
|
for (fi = si->fds; fi; fi = fi->next) {
|
|
if (fi->fd == fd) {
|
|
SWRAP_DLIST_REMOVE(si->fds, fi);
|
|
free(fi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (si->fds) {
|
|
/* there are still references left */
|
|
return libc_close(fd);
|
|
}
|
|
|
|
SWRAP_DLIST_REMOVE(sockets, si);
|
|
|
|
if (si->myname.sa_socklen > 0 && si->peername.sa_socklen > 0) {
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
|
|
}
|
|
|
|
ret = libc_close(fd);
|
|
|
|
if (si->myname.sa_socklen > 0 && si->peername.sa_socklen > 0) {
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
|
|
swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
|
|
}
|
|
|
|
if (si->un_addr.sun_path[0] != '\0') {
|
|
unlink(si->un_addr.sun_path);
|
|
}
|
|
free(si);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int close(int fd)
|
|
{
|
|
return swrap_close(fd);
|
|
}
|
|
|
|
/****************************
|
|
* DUP
|
|
***************************/
|
|
|
|
static int swrap_dup(int fd)
|
|
{
|
|
struct socket_info *si;
|
|
struct socket_info_fd *fi;
|
|
|
|
si = find_socket_info(fd);
|
|
|
|
if (!si) {
|
|
return libc_dup(fd);
|
|
}
|
|
|
|
fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
|
|
if (fi == NULL) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
fi->fd = libc_dup(fd);
|
|
if (fi->fd == -1) {
|
|
int saved_errno = errno;
|
|
free(fi);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
|
|
/* Make sure we don't have an entry for the fd */
|
|
swrap_remove_stale(fi->fd);
|
|
|
|
SWRAP_DLIST_ADD(si->fds, fi);
|
|
return fi->fd;
|
|
}
|
|
|
|
int dup(int fd)
|
|
{
|
|
return swrap_dup(fd);
|
|
}
|
|
|
|
/****************************
|
|
* DUP2
|
|
***************************/
|
|
|
|
static int swrap_dup2(int fd, int newfd)
|
|
{
|
|
struct socket_info *si;
|
|
struct socket_info_fd *fi;
|
|
|
|
si = find_socket_info(fd);
|
|
|
|
if (!si) {
|
|
return libc_dup2(fd, newfd);
|
|
}
|
|
|
|
if (find_socket_info(newfd)) {
|
|
/* dup2() does an implicit close of newfd, which we
|
|
* need to emulate */
|
|
swrap_close(newfd);
|
|
}
|
|
|
|
fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
|
|
if (fi == NULL) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
fi->fd = libc_dup2(fd, newfd);
|
|
if (fi->fd == -1) {
|
|
int saved_errno = errno;
|
|
free(fi);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
|
|
/* Make sure we don't have an entry for the fd */
|
|
swrap_remove_stale(fi->fd);
|
|
|
|
SWRAP_DLIST_ADD(si->fds, fi);
|
|
return fi->fd;
|
|
}
|
|
|
|
int dup2(int fd, int newfd)
|
|
{
|
|
return swrap_dup2(fd, newfd);
|
|
}
|
|
|
|
/****************************
|
|
* FCNTL
|
|
***************************/
|
|
|
|
static int swrap_vfcntl(int fd, int cmd, va_list va)
|
|
{
|
|
struct socket_info_fd *fi;
|
|
struct socket_info *si;
|
|
int rc;
|
|
|
|
si = find_socket_info(fd);
|
|
if (si == NULL) {
|
|
rc = libc_vfcntl(fd, cmd, va);
|
|
|
|
return rc;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case F_DUPFD:
|
|
fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
|
|
if (fi == NULL) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
fi->fd = libc_vfcntl(fd, cmd, va);
|
|
if (fi->fd == -1) {
|
|
int saved_errno = errno;
|
|
free(fi);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
|
|
/* Make sure we don't have an entry for the fd */
|
|
swrap_remove_stale(fi->fd);
|
|
|
|
SWRAP_DLIST_ADD(si->fds, fi);
|
|
|
|
rc = fi->fd;
|
|
break;
|
|
default:
|
|
rc = libc_vfcntl(fd, cmd, va);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int fcntl(int fd, int cmd, ...)
|
|
{
|
|
va_list va;
|
|
int rc;
|
|
|
|
va_start(va, cmd);
|
|
|
|
rc = swrap_vfcntl(fd, cmd, va);
|
|
|
|
va_end(va);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/****************************
|
|
* EVENTFD
|
|
***************************/
|
|
|
|
#ifdef HAVE_EVENTFD
|
|
static int swrap_eventfd(int count, int flags)
|
|
{
|
|
int fd;
|
|
|
|
fd = libc_eventfd(count, flags);
|
|
if (fd != -1) {
|
|
swrap_remove_stale(fd);
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
#ifdef HAVE_EVENTFD_UNSIGNED_INT
|
|
int eventfd(unsigned int count, int flags)
|
|
#else
|
|
int eventfd(int count, int flags)
|
|
#endif
|
|
{
|
|
return swrap_eventfd(count, flags);
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_PLEDGE
|
|
int pledge(const char *promises, const char *paths[])
|
|
{
|
|
(void)promises; /* unused */
|
|
(void)paths; /* unused */
|
|
|
|
return 0;
|
|
}
|
|
#endif /* HAVE_PLEDGE */
|
|
|
|
/****************************
|
|
* DESTRUCTOR
|
|
***************************/
|
|
|
|
/*
|
|
* This function is called when the library is unloaded and makes sure that
|
|
* sockets get closed and the unix file for the socket are unlinked.
|
|
*/
|
|
void swrap_destructor(void)
|
|
{
|
|
struct socket_info *s = sockets;
|
|
|
|
while (s != NULL) {
|
|
struct socket_info_fd *f = s->fds;
|
|
if (f != NULL) {
|
|
swrap_close(f->fd);
|
|
}
|
|
s = sockets;
|
|
}
|
|
|
|
if (swrap.libc_handle != NULL) {
|
|
dlclose(swrap.libc_handle);
|
|
}
|
|
if (swrap.libsocket_handle) {
|
|
dlclose(swrap.libsocket_handle);
|
|
}
|
|
}
|