mirror of
https://github.com/samba-team/samba.git
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2655 lines
57 KiB
C
2655 lines
57 KiB
C
/*
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* Copyright (C) Jelmer Vernooij 2005,2008 <jelmer@samba.org>
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* Copyright (C) Stefan Metzmacher 2006-2009 <metze@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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#ifdef HAVE_LIBREPLACE
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#define SOCKET_WRAPPER_NOT_REPLACE
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#include "replace.h"
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#include "system/network.h"
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#include "system/filesys.h"
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#include "system/time.h"
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#else /* HAVE_LIBREPLACE */
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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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#include <sys/filio.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 <fcntl.h>
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#include <stdlib.h>
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#include <unistd.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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#endif /* HAVE_LIBREPLACE */
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#ifndef _PUBLIC_
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#define _PUBLIC_
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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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/* LD_PRELOAD doesn't work yet, so REWRITE_CALLS is all we support
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* for now */
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#define REWRITE_CALLS
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#ifdef REWRITE_CALLS
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#define real_accept accept
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#define real_connect connect
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#define real_bind bind
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#define real_listen listen
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#define real_getpeername getpeername
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#define real_getsockname getsockname
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#define real_getsockopt getsockopt
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#define real_setsockopt setsockopt
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#define real_recvfrom recvfrom
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#define real_sendto sendto
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#define real_sendmsg sendmsg
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#define real_ioctl ioctl
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#define real_recv recv
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#define real_read read
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#define real_send send
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#define real_readv readv
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#define real_writev writev
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#define real_socket socket
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#define real_close close
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#define real_dup dup
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#define real_dup2 dup2
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#endif
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#ifdef HAVE_GETTIMEOFDAY_TZ
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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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/* 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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#ifdef HAVE_IPV6
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/*
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* FD00::5357:5FXX
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*/
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static const struct in6_addr *swrap_ipv6(void)
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{
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static struct in6_addr v;
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static int initialized;
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int ret;
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if (initialized) {
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return &v;
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}
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initialized = 1;
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ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
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if (ret <= 0) {
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abort();
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}
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return &v;
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}
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#endif
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static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
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{
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struct sockaddr *ret = (struct sockaddr *)malloc(len);
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memcpy(ret, data, len);
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return ret;
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}
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static void set_port(int family, int prt, struct sockaddr *addr)
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{
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switch (family) {
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case AF_INET:
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((struct sockaddr_in *)addr)->sin_port = htons(prt);
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break;
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#ifdef HAVE_IPV6
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case AF_INET6:
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((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
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break;
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#endif
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}
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}
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static size_t socket_length(int family)
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{
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switch (family) {
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case AF_INET:
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return sizeof(struct sockaddr_in);
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#ifdef HAVE_IPV6
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case AF_INET6:
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return sizeof(struct sockaddr_in6);
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#endif
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}
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return 0;
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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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char *tmp_path;
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struct sockaddr *myname;
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socklen_t myname_len;
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struct sockaddr *peername;
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socklen_t peername_len;
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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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static struct socket_info *sockets;
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const char *socket_wrapper_dir(void)
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{
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const char *s = getenv("SOCKET_WRAPPER_DIR");
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if (s == NULL) {
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return NULL;
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}
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if (strncmp(s, "./", 2) == 0) {
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s += 2;
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}
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return s;
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}
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unsigned int socket_wrapper_default_iface(void)
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{
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const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
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if (s) {
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unsigned int iface;
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if (sscanf(s, "%u", &iface) == 1) {
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if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
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return iface;
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}
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}
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}
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return 1;/* 127.0.0.1 */
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}
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static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
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{
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unsigned int iface;
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unsigned int prt;
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const char *p;
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char type;
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p = strrchr(un->sun_path, '/');
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if (p) p++; else p = un->sun_path;
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if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
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errno = EINVAL;
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return -1;
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}
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if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
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errno = EINVAL;
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return -1;
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}
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if (prt > 0xFFFF) {
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errno = EINVAL;
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return -1;
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}
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switch(type) {
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case SOCKET_TYPE_CHAR_TCP:
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case SOCKET_TYPE_CHAR_UDP: {
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struct sockaddr_in *in2 = (struct sockaddr_in *)(void *)in;
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if ((*len) < sizeof(*in2)) {
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errno = EINVAL;
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return -1;
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}
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memset(in2, 0, sizeof(*in2));
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in2->sin_family = AF_INET;
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in2->sin_addr.s_addr = htonl((127<<24) | iface);
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in2->sin_port = htons(prt);
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*len = sizeof(*in2);
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break;
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}
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#ifdef HAVE_IPV6
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case SOCKET_TYPE_CHAR_TCP_V6:
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case SOCKET_TYPE_CHAR_UDP_V6: {
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struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)(void *)in;
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if ((*len) < sizeof(*in2)) {
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errno = EINVAL;
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return -1;
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}
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memset(in2, 0, sizeof(*in2));
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in2->sin6_family = AF_INET6;
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in2->sin6_addr = *swrap_ipv6();
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in2->sin6_addr.s6_addr[15] = iface;
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in2->sin6_port = htons(prt);
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*len = sizeof(*in2);
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break;
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}
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#endif
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default:
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
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int *bcast)
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{
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char type = '\0';
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unsigned int prt;
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unsigned int iface;
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int is_bcast = 0;
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if (bcast) *bcast = 0;
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switch (inaddr->sa_family) {
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case AF_INET: {
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const struct sockaddr_in *in =
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(const struct sockaddr_in *)(const void *)inaddr;
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unsigned int addr = ntohl(in->sin_addr.s_addr);
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char u_type = '\0';
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char b_type = '\0';
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char a_type = '\0';
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switch (si->type) {
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case SOCK_STREAM:
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u_type = SOCKET_TYPE_CHAR_TCP;
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break;
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case SOCK_DGRAM:
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u_type = SOCKET_TYPE_CHAR_UDP;
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a_type = SOCKET_TYPE_CHAR_UDP;
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b_type = SOCKET_TYPE_CHAR_UDP;
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break;
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}
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prt = ntohs(in->sin_port);
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if (a_type && addr == 0xFFFFFFFF) {
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/* 255.255.255.255 only udp */
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is_bcast = 2;
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type = a_type;
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iface = socket_wrapper_default_iface();
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} else if (b_type && addr == 0x7FFFFFFF) {
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/* 127.255.255.255 only udp */
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is_bcast = 1;
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type = b_type;
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iface = socket_wrapper_default_iface();
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} else if ((addr & 0xFFFFFF00) == 0x7F000000) {
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/* 127.0.0.X */
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is_bcast = 0;
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type = u_type;
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iface = (addr & 0x000000FF);
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} else {
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errno = ENETUNREACH;
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return -1;
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}
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if (bcast) *bcast = is_bcast;
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break;
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}
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#ifdef HAVE_IPV6
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case AF_INET6: {
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const struct sockaddr_in6 *in =
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(const struct sockaddr_in6 *)(const void *)inaddr;
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struct in6_addr cmp1, cmp2;
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switch (si->type) {
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case SOCK_STREAM:
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type = SOCKET_TYPE_CHAR_TCP_V6;
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break;
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case SOCK_DGRAM:
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type = SOCKET_TYPE_CHAR_UDP_V6;
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break;
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}
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/* XXX no multicast/broadcast */
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prt = ntohs(in->sin6_port);
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cmp1 = *swrap_ipv6();
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cmp2 = in->sin6_addr;
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cmp2.s6_addr[15] = 0;
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if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
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iface = in->sin6_addr.s6_addr[15];
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} else {
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errno = ENETUNREACH;
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return -1;
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}
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break;
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}
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#endif
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default:
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errno = ENETUNREACH;
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return -1;
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}
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if (prt == 0) {
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errno = EINVAL;
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return -1;
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}
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if (is_bcast) {
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snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
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socket_wrapper_dir());
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/* the caller need to do more processing */
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return 0;
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}
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snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
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socket_wrapper_dir(), type, iface, prt);
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return 0;
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}
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static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
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int *bcast)
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{
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char type = '\0';
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unsigned int prt;
|
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unsigned int iface;
|
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struct stat st;
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int is_bcast = 0;
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if (bcast) *bcast = 0;
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switch (si->family) {
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case AF_INET: {
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const struct sockaddr_in *in =
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(const struct sockaddr_in *)(const void *)inaddr;
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unsigned int addr = ntohl(in->sin_addr.s_addr);
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char u_type = '\0';
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char d_type = '\0';
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char b_type = '\0';
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char a_type = '\0';
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prt = ntohs(in->sin_port);
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switch (si->type) {
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case SOCK_STREAM:
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u_type = SOCKET_TYPE_CHAR_TCP;
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d_type = SOCKET_TYPE_CHAR_TCP;
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break;
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case SOCK_DGRAM:
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u_type = SOCKET_TYPE_CHAR_UDP;
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d_type = SOCKET_TYPE_CHAR_UDP;
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a_type = SOCKET_TYPE_CHAR_UDP;
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b_type = SOCKET_TYPE_CHAR_UDP;
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break;
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}
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if (addr == 0) {
|
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/* 0.0.0.0 */
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is_bcast = 0;
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type = d_type;
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iface = socket_wrapper_default_iface();
|
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} else if (a_type && addr == 0xFFFFFFFF) {
|
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/* 255.255.255.255 only udp */
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is_bcast = 2;
|
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type = a_type;
|
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iface = socket_wrapper_default_iface();
|
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} else if (b_type && addr == 0x7FFFFFFF) {
|
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/* 127.255.255.255 only udp */
|
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is_bcast = 1;
|
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type = b_type;
|
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iface = socket_wrapper_default_iface();
|
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} else if ((addr & 0xFFFFFF00) == 0x7F000000) {
|
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/* 127.0.0.X */
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is_bcast = 0;
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type = u_type;
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iface = (addr & 0x000000FF);
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} else {
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errno = EADDRNOTAVAIL;
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return -1;
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}
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break;
|
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}
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6: {
|
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const struct sockaddr_in6 *in =
|
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(const struct sockaddr_in6 *)(const void *)inaddr;
|
|
struct in6_addr cmp1, cmp2;
|
|
|
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switch (si->type) {
|
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case SOCK_STREAM:
|
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type = SOCKET_TYPE_CHAR_TCP_V6;
|
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break;
|
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case SOCK_DGRAM:
|
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type = SOCKET_TYPE_CHAR_UDP_V6;
|
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break;
|
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}
|
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|
|
/* XXX no multicast/broadcast */
|
|
|
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prt = ntohs(in->sin6_port);
|
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|
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cmp1 = *swrap_ipv6();
|
|
cmp2 = in->sin6_addr;
|
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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;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
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);
|
|
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);
|
|
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;
|
|
}
|
|
|
|
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;
|
|
if (!out_addr)
|
|
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_INET:
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
switch (si->type) {
|
|
case SOCK_STREAM:
|
|
case SOCK_DGRAM:
|
|
break;
|
|
default:
|
|
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;
|
|
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:
|
|
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;
|
|
}
|
|
|
|
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 *socket_wrapper_pcap_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_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 *)src;
|
|
dest_in = (const struct sockaddr_in *)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 *)src;
|
|
dest_in6 = (const struct sockaddr_in6 *)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 *)malloc(alloc_len);
|
|
if (!base) return NULL;
|
|
|
|
buf = base;
|
|
|
|
frame = (struct swrap_packet_frame *)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 *)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 fraqment */
|
|
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 *)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 *)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 fraqment */
|
|
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 *)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 *)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_get_pcap_fd(const char *fname)
|
|
{
|
|
static int fd = -1;
|
|
|
|
if (fd != -1) return fd;
|
|
|
|
fd = 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 = open(fname, O_WRONLY|O_APPEND, 0644);
|
|
|
|
return fd;
|
|
}
|
|
|
|
static uint8_t *swrap_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;
|
|
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;
|
|
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;
|
|
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;
|
|
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;
|
|
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;
|
|
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;
|
|
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;
|
|
dest_addr = si->peername;
|
|
|
|
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;
|
|
src_addr = si->peername;
|
|
|
|
if (si->type == SOCK_DGRAM) {
|
|
return swrap_marshall_packet(si, si->peername,
|
|
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;
|
|
src_addr = si->peername;
|
|
|
|
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;
|
|
src_addr = si->peername;
|
|
|
|
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;
|
|
src_addr = si->peername;
|
|
|
|
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;
|
|
dest_addr = addr;
|
|
|
|
si->io.pck_snd += len;
|
|
|
|
break;
|
|
|
|
case SWRAP_SENDTO_UNREACH:
|
|
dest_addr = si->myname;
|
|
src_addr = addr;
|
|
|
|
unreachable = 1;
|
|
|
|
break;
|
|
|
|
case SWRAP_RECVFROM:
|
|
dest_addr = si->myname;
|
|
src_addr = addr;
|
|
|
|
si->io.pck_rcv += len;
|
|
|
|
break;
|
|
|
|
case SWRAP_CLOSE_SEND:
|
|
if (si->type != SOCK_STREAM) return NULL;
|
|
|
|
src_addr = si->myname;
|
|
dest_addr = si->peername;
|
|
|
|
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;
|
|
src_addr = si->peername;
|
|
|
|
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;
|
|
dest_addr = si->peername;
|
|
|
|
tcp_seqno = si->io.pck_snd;
|
|
tcp_ack = si->io.pck_rcv;
|
|
tcp_ctl = 0x10; /* ACK */
|
|
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
swrapGetTimeOfDay(&tv);
|
|
|
|
return swrap_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_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 = socket_wrapper_pcap_file();
|
|
if (!file_name) {
|
|
return;
|
|
}
|
|
|
|
packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
|
|
if (!packet) {
|
|
return;
|
|
}
|
|
|
|
fd = swrap_get_pcap_fd(file_name);
|
|
if (fd != -1) {
|
|
if (write(fd, packet, packet_len) != packet_len) {
|
|
free(packet);
|
|
return;
|
|
}
|
|
}
|
|
|
|
free(packet);
|
|
}
|
|
|
|
_PUBLIC_ int swrap_socket(int family, int type, int protocol)
|
|
{
|
|
struct socket_info *si;
|
|
struct socket_info_fd *fi;
|
|
int fd;
|
|
int real_type = type;
|
|
#ifdef SOCK_CLOEXEC
|
|
real_type &= ~SOCK_CLOEXEC;
|
|
#endif
|
|
#ifdef SOCK_NONBLOCK
|
|
real_type &= ~SOCK_NONBLOCK;
|
|
#endif
|
|
|
|
if (!socket_wrapper_dir()) {
|
|
return real_socket(family, type, protocol);
|
|
}
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
break;
|
|
case AF_UNIX:
|
|
return real_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 real_socket with type, from the caller, not the version we removed
|
|
SOCK_CLOEXEC and SOCK_NONBLOCK from */
|
|
fd = real_socket(AF_UNIX, type, 0);
|
|
|
|
if (fd == -1) return -1;
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
return fd;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
|
|
{
|
|
struct socket_info *parent_si, *child_si;
|
|
struct socket_info_fd *child_fi;
|
|
int fd;
|
|
struct sockaddr_un un_addr;
|
|
socklen_t un_addrlen = sizeof(un_addr);
|
|
struct sockaddr_un un_my_addr;
|
|
socklen_t un_my_addrlen = sizeof(un_my_addr);
|
|
struct sockaddr *my_addr;
|
|
socklen_t my_addrlen, len;
|
|
int ret;
|
|
|
|
parent_si = find_socket_info(s);
|
|
if (!parent_si) {
|
|
return real_accept(s, addr, addrlen);
|
|
}
|
|
|
|
/*
|
|
* assume out sockaddr have the same size as the in parent
|
|
* socket family
|
|
*/
|
|
my_addrlen = socket_length(parent_si->family);
|
|
if (my_addrlen <= 0) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
my_addr = (struct sockaddr *)malloc(my_addrlen);
|
|
if (my_addr == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
memset(&un_addr, 0, sizeof(un_addr));
|
|
memset(&un_my_addr, 0, sizeof(un_my_addr));
|
|
|
|
ret = real_accept(s, (struct sockaddr *)(void *)&un_addr, &un_addrlen);
|
|
if (ret == -1) {
|
|
free(my_addr);
|
|
return ret;
|
|
}
|
|
|
|
fd = ret;
|
|
|
|
len = my_addrlen;
|
|
ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
|
|
parent_si->family, my_addr, &len);
|
|
if (ret == -1) {
|
|
free(my_addr);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
|
|
memset(child_si, 0, sizeof(*child_si));
|
|
|
|
child_fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
|
|
if (child_fi == NULL) {
|
|
free(child_si);
|
|
free(my_addr);
|
|
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_len = len;
|
|
child_si->peername = sockaddr_dup(my_addr, len);
|
|
|
|
if (addr != NULL && addrlen != NULL) {
|
|
size_t copy_len = MIN(*addrlen, len);
|
|
if (copy_len > 0) {
|
|
memcpy(addr, my_addr, copy_len);
|
|
}
|
|
*addrlen = len;
|
|
}
|
|
|
|
ret = real_getsockname(fd, (struct sockaddr *)(void *)&un_my_addr,
|
|
&un_my_addrlen);
|
|
if (ret == -1) {
|
|
free(child_fi);
|
|
free(child_si);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
len = my_addrlen;
|
|
ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
|
|
child_si->family, my_addr, &len);
|
|
if (ret == -1) {
|
|
free(child_fi);
|
|
free(child_si);
|
|
free(my_addr);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
child_si->myname_len = len;
|
|
child_si->myname = sockaddr_dup(my_addr, len);
|
|
free(my_addr);
|
|
|
|
SWRAP_DLIST_ADD(sockets, child_si);
|
|
|
|
swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
|
|
swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
|
|
swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
|
|
|
|
return fd;
|
|
}
|
|
|
|
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 emphemeral 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 sockaddr_un un_addr;
|
|
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.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_len = sizeof(in);
|
|
si->myname = sockaddr_dup(&in, si->myname_len);
|
|
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_len = sizeof(in6);
|
|
si->myname = sockaddr_dup(&in6, si->myname_len);
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
errno = ESOCKTNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
if (autobind_start > 60000) {
|
|
autobind_start = 10000;
|
|
}
|
|
|
|
for (i=0;i<1000;i++) {
|
|
port = autobind_start + i;
|
|
snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
|
|
"%s/"SOCKET_FORMAT, socket_wrapper_dir(),
|
|
type, socket_wrapper_default_iface(), port);
|
|
if (stat(un_addr.sun_path, &st) == 0) continue;
|
|
|
|
ret = real_bind(fd, (struct sockaddr *)(void *)&un_addr,
|
|
sizeof(un_addr));
|
|
if (ret == -1) return ret;
|
|
|
|
si->tmp_path = strdup(un_addr.sun_path);
|
|
si->bound = 1;
|
|
autobind_start = port + 1;
|
|
break;
|
|
}
|
|
if (i == 1000) {
|
|
errno = ENFILE;
|
|
return -1;
|
|
}
|
|
|
|
si->family = family;
|
|
set_port(si->family, port, si->myname);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
_PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
|
|
{
|
|
int ret;
|
|
struct sockaddr_un un_addr;
|
|
struct socket_info *si = find_socket_info(s);
|
|
int bcast = 0;
|
|
|
|
if (!si) {
|
|
return real_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, 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_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
|
|
|
|
ret = real_connect(s, (struct sockaddr *)(void *)&un_addr,
|
|
sizeof(struct sockaddr_un));
|
|
}
|
|
|
|
/* to give better errors */
|
|
if (ret == -1 && errno == ENOENT) {
|
|
errno = EHOSTUNREACH;
|
|
}
|
|
|
|
if (ret == 0) {
|
|
si->peername_len = addrlen;
|
|
si->peername = sockaddr_dup(serv_addr, addrlen);
|
|
si->connected = 1;
|
|
|
|
swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
|
|
swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
|
|
} else {
|
|
swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
|
|
{
|
|
int ret;
|
|
struct sockaddr_un un_addr;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_bind(s, myaddr, addrlen);
|
|
}
|
|
|
|
si->myname_len = addrlen;
|
|
si->myname = sockaddr_dup(myaddr, addrlen);
|
|
|
|
ret = sockaddr_convert_to_un(si, myaddr, addrlen, &un_addr, 1, &si->bcast);
|
|
if (ret == -1) return -1;
|
|
|
|
unlink(un_addr.sun_path);
|
|
|
|
ret = real_bind(s, (struct sockaddr *)(void *)&un_addr,
|
|
sizeof(struct sockaddr_un));
|
|
|
|
if (ret == 0) {
|
|
si->bound = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_listen(int s, int backlog)
|
|
{
|
|
int ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_listen(s, backlog);
|
|
}
|
|
|
|
ret = real_listen(s, backlog);
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
|
|
{
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_getpeername(s, name, addrlen);
|
|
}
|
|
|
|
if (!si->peername)
|
|
{
|
|
errno = ENOTCONN;
|
|
return -1;
|
|
}
|
|
|
|
memcpy(name, si->peername, si->peername_len);
|
|
*addrlen = si->peername_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
|
|
{
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_getsockname(s, name, addrlen);
|
|
}
|
|
|
|
memcpy(name, si->myname, si->myname_len);
|
|
*addrlen = si->myname_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
_PUBLIC_ 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 real_getsockopt(s, level, optname, optval, optlen);
|
|
}
|
|
|
|
if (level == SOL_SOCKET) {
|
|
return real_getsockopt(s, level, optname, optval, optlen);
|
|
}
|
|
|
|
errno = ENOPROTOOPT;
|
|
return -1;
|
|
}
|
|
|
|
_PUBLIC_ 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 real_setsockopt(s, level, optname, optval, optlen);
|
|
}
|
|
|
|
if (level == SOL_SOCKET) {
|
|
return real_setsockopt(s, level, optname, optval, optlen);
|
|
}
|
|
|
|
switch (si->family) {
|
|
case AF_INET:
|
|
return 0;
|
|
#ifdef HAVE_IPV6
|
|
case AF_INET6:
|
|
return 0;
|
|
#endif
|
|
default:
|
|
errno = ENOPROTOOPT;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
_PUBLIC_ int swrap_ioctl(int s, int r, void *p)
|
|
{
|
|
int ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
int value;
|
|
|
|
if (!si) {
|
|
return real_ioctl(s, r, p);
|
|
}
|
|
|
|
ret = real_ioctl(s, r, p);
|
|
|
|
switch (r) {
|
|
case FIONREAD:
|
|
value = *((int *)p);
|
|
if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
|
|
swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
|
|
} else if (value == 0) { /* END OF FILE */
|
|
swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
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:
|
|
if (!si->connected) {
|
|
errno = ENOTCONN;
|
|
return -1;
|
|
}
|
|
|
|
if (msg->msg_iovlen == 0) {
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* cut down to 1500 byte packets for stream sockets,
|
|
* which makes it easier to format PCAP capture files
|
|
* (as the caller will simply continue from here)
|
|
*/
|
|
|
|
for (i=0; i < msg->msg_iovlen; i++) {
|
|
size_t nlen;
|
|
nlen = len + msg->msg_iov[i].iov_len;
|
|
if (nlen > 1500) {
|
|
break;
|
|
}
|
|
}
|
|
msg->msg_iovlen = i;
|
|
if (msg->msg_iovlen == 0) {
|
|
*tmp_iov = msg->msg_iov[0];
|
|
tmp_iov->iov_len = MIN(tmp_iov->iov_len, 1500);
|
|
msg->msg_iov = tmp_iov;
|
|
msg->msg_iovlen = 1;
|
|
}
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
if (si->connected) {
|
|
if (msg->msg_name) {
|
|
errno = EISCONN;
|
|
return -1;
|
|
}
|
|
} 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) return -1;
|
|
}
|
|
|
|
if (!si->defer_connect) {
|
|
break;
|
|
}
|
|
|
|
ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
|
|
tmp_un, 0, NULL);
|
|
if (ret == -1) return -1;
|
|
|
|
ret = real_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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void swrap_sendmsg_after(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 && saved_errno == ENOENT) {
|
|
saved_errno = EHOSTUNREACH;
|
|
}
|
|
|
|
for (i=0; i < 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 < msg->msg_iovlen; i++) {
|
|
size_t this_time = MIN(remain, 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_dump_packet(si, NULL, SWRAP_SEND, buf, len);
|
|
swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
|
|
} else {
|
|
swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
|
|
}
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
if (si->connected) {
|
|
to = si->peername;
|
|
}
|
|
if (ret == -1) {
|
|
swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
|
|
} else {
|
|
swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
}
|
|
break;
|
|
}
|
|
|
|
free(buf);
|
|
errno = saved_errno;
|
|
}
|
|
|
|
_PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
|
|
{
|
|
struct sockaddr_un un_addr;
|
|
socklen_t un_addrlen = sizeof(un_addr);
|
|
int ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
struct sockaddr_storage ss;
|
|
socklen_t ss_len = sizeof(ss);
|
|
|
|
if (!si) {
|
|
return real_recvfrom(s, buf, len, flags, from, fromlen);
|
|
}
|
|
|
|
if (!from) {
|
|
from = (struct sockaddr *)(void *)&ss;
|
|
fromlen = &ss_len;
|
|
}
|
|
|
|
if (si->type == SOCK_STREAM) {
|
|
/* cut down to 1500 byte packets for stream sockets,
|
|
* which makes it easier to format PCAP capture files
|
|
* (as the caller will simply continue from here) */
|
|
len = MIN(len, 1500);
|
|
}
|
|
|
|
/* irix 6.4 forgets to null terminate the sun_path string :-( */
|
|
memset(&un_addr, 0, sizeof(un_addr));
|
|
ret = real_recvfrom(s, buf, len, flags,
|
|
(struct sockaddr *)(void *)&un_addr, &un_addrlen);
|
|
if (ret == -1)
|
|
return ret;
|
|
|
|
if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
|
|
si->family, from, fromlen) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
_PUBLIC_ 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 sockaddr_un un_addr;
|
|
const struct sockaddr_un *to_un = NULL;
|
|
ssize_t ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
int bcast = 0;
|
|
|
|
if (!si) {
|
|
return real_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 0 /* not available on solaris */
|
|
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
|
|
|
|
ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
|
|
if (ret == -1) 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 *)to)->sin_port);
|
|
char type;
|
|
|
|
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;
|
|
|
|
/* ignore the any errors in broadcast sends */
|
|
real_sendto(s, buf, len, flags,
|
|
(struct sockaddr *)(void *)&un_addr,
|
|
sizeof(un_addr));
|
|
}
|
|
|
|
swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
|
|
return len;
|
|
}
|
|
|
|
ret = real_sendto(s, buf, len, flags, (struct sockaddr *)msg.msg_name,
|
|
msg.msg_namelen);
|
|
|
|
swrap_sendmsg_after(si, &msg, to, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
|
|
{
|
|
int ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_recv(s, buf, len, flags);
|
|
}
|
|
|
|
if (si->type == SOCK_STREAM) {
|
|
/* cut down to 1500 byte packets for stream sockets,
|
|
* which makes it easier to format PCAP capture files
|
|
* (as the caller will simply continue from here) */
|
|
len = MIN(len, 1500);
|
|
}
|
|
|
|
ret = real_recv(s, buf, len, flags);
|
|
if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret == 0) { /* END OF FILE */
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret > 0) {
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ ssize_t swrap_read(int s, void *buf, size_t len)
|
|
{
|
|
int ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_read(s, buf, len);
|
|
}
|
|
|
|
if (si->type == SOCK_STREAM) {
|
|
/* cut down to 1500 byte packets for stream sockets,
|
|
* which makes it easier to format PCAP capture files
|
|
* (as the caller will simply continue from here) */
|
|
len = MIN(len, 1500);
|
|
}
|
|
|
|
ret = real_read(s, buf, len);
|
|
if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret == 0) { /* END OF FILE */
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret > 0) {
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
_PUBLIC_ 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;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_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 0 /* not available on solaris */
|
|
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
|
|
|
|
ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
|
|
if (ret == -1) return -1;
|
|
|
|
buf = msg.msg_iov[0].iov_base;
|
|
len = msg.msg_iov[0].iov_len;
|
|
|
|
ret = real_send(s, buf, len, flags);
|
|
|
|
swrap_sendmsg_after(si, &msg, NULL, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ 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;
|
|
struct socket_info *si = find_socket_info(s);
|
|
int bcast = 0;
|
|
|
|
if (!si) {
|
|
return real_sendmsg(s, omsg, flags);
|
|
}
|
|
|
|
tmp.iov_base = NULL;
|
|
tmp.iov_len = 0;
|
|
|
|
msg = *omsg;
|
|
#if 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 */
|
|
/* the following is not available on solaris */
|
|
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
|
|
|
|
ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
|
|
if (ret == -1) return -1;
|
|
|
|
if (bcast) {
|
|
struct stat st;
|
|
unsigned int iface;
|
|
unsigned int prt = ntohs(((const struct sockaddr_in *)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 < 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 < msg.msg_iovlen; i++) {
|
|
size_t this_time = MIN(remain, 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 */
|
|
real_sendmsg(s, &msg, flags);
|
|
}
|
|
|
|
swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
|
|
free(buf);
|
|
|
|
return len;
|
|
}
|
|
|
|
ret = real_sendmsg(s, &msg, flags);
|
|
|
|
swrap_sendmsg_after(si, &msg, to, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int swrap_readv(int s, const struct iovec *vector, size_t count)
|
|
{
|
|
int ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
struct iovec v;
|
|
|
|
if (!si) {
|
|
return real_readv(s, vector, count);
|
|
}
|
|
|
|
if (!si->connected) {
|
|
errno = ENOTCONN;
|
|
return -1;
|
|
}
|
|
|
|
if (si->type == SOCK_STREAM && count > 0) {
|
|
/* cut down to 1500 byte packets for stream sockets,
|
|
* which makes it easier to format PCAP capture files
|
|
* (as the caller will simply continue from here) */
|
|
size_t i, len = 0;
|
|
|
|
for (i=0; i < count; i++) {
|
|
size_t nlen;
|
|
nlen = len + vector[i].iov_len;
|
|
if (nlen > 1500) {
|
|
break;
|
|
}
|
|
}
|
|
count = i;
|
|
if (count == 0) {
|
|
v = vector[0];
|
|
v.iov_len = MIN(v.iov_len, 1500);
|
|
vector = &v;
|
|
count = 1;
|
|
}
|
|
}
|
|
|
|
ret = real_readv(s, vector, count);
|
|
if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret == 0) { /* END OF FILE */
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
|
|
} else if (ret > 0) {
|
|
uint8_t *buf;
|
|
off_t ofs = 0;
|
|
size_t i;
|
|
size_t remain = ret;
|
|
|
|
/* we capture it as one single packet */
|
|
buf = (uint8_t *)malloc(ret);
|
|
if (!buf) {
|
|
/* we just not capture the packet */
|
|
errno = 0;
|
|
return ret;
|
|
}
|
|
|
|
for (i=0; i < count; i++) {
|
|
size_t this_time = MIN(remain, vector[i].iov_len);
|
|
memcpy(buf + ofs,
|
|
vector[i].iov_base,
|
|
this_time);
|
|
ofs += this_time;
|
|
remain -= this_time;
|
|
}
|
|
|
|
swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
|
|
free(buf);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t swrap_writev(int s, const struct iovec *vector, size_t count)
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec tmp;
|
|
struct sockaddr_un un_addr;
|
|
ssize_t ret;
|
|
struct socket_info *si = find_socket_info(s);
|
|
|
|
if (!si) {
|
|
return real_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 0 /* not available on solaris */
|
|
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
|
|
|
|
ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
|
|
if (ret == -1) return -1;
|
|
|
|
ret = real_writev(s, msg.msg_iov, msg.msg_iovlen);
|
|
|
|
swrap_sendmsg_after(si, &msg, NULL, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_close(int fd)
|
|
{
|
|
struct socket_info *si = find_socket_info(fd);
|
|
struct socket_info_fd *fi;
|
|
int ret;
|
|
|
|
if (!si) {
|
|
return real_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 real_close(fd);
|
|
}
|
|
|
|
SWRAP_DLIST_REMOVE(sockets, si);
|
|
|
|
if (si->myname && si->peername) {
|
|
swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
|
|
}
|
|
|
|
ret = real_close(fd);
|
|
|
|
if (si->myname && si->peername) {
|
|
swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
|
|
swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
|
|
}
|
|
|
|
if (si->myname) free(si->myname);
|
|
if (si->peername) free(si->peername);
|
|
if (si->tmp_path) {
|
|
unlink(si->tmp_path);
|
|
free(si->tmp_path);
|
|
}
|
|
free(si);
|
|
|
|
return ret;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_dup(int fd)
|
|
{
|
|
struct socket_info *si;
|
|
struct socket_info_fd *fi;
|
|
|
|
si = find_socket_info(fd);
|
|
|
|
if (!si) {
|
|
return real_dup(fd);
|
|
}
|
|
|
|
fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
|
|
if (fi == NULL) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
fi->fd = real_dup(fd);
|
|
if (fi->fd == -1) {
|
|
int saved_errno = errno;
|
|
free(fi);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
|
|
SWRAP_DLIST_ADD(si->fds, fi);
|
|
return fi->fd;
|
|
}
|
|
|
|
_PUBLIC_ int swrap_dup2(int fd, int newfd)
|
|
{
|
|
struct socket_info *si;
|
|
struct socket_info_fd *fi;
|
|
|
|
si = find_socket_info(fd);
|
|
|
|
if (!si) {
|
|
return real_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 = real_dup2(fd, newfd);
|
|
if (fi->fd == -1) {
|
|
int saved_errno = errno;
|
|
free(fi);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
|
|
SWRAP_DLIST_ADD(si->fds, fi);
|
|
return fi->fd;
|
|
}
|