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samba-mirror/lib/socket_wrapper/socket_wrapper.c
Andreas Schneider 6ba81a483c swrap: If we remove the socket_info also unlink the unix socket 
Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
2015-02-23 20:02:51 +01:00

5075 lines
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/*
* Copyright (c) 2005-2008 Jelmer Vernooij <jelmer@samba.org>
* Copyright (C) 2006-2014 Stefan Metzmacher <metze@samba.org>
* Copyright (C) 2013-2014 Andreas Schneider <asn@samba.org>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
Socket wrapper library. Passes all socket communication over
unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
is set.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#ifdef HAVE_SYS_SIGNALFD_H
#include <sys/signalfd.h>
#endif
#ifdef HAVE_SYS_EVENTFD_H
#include <sys/eventfd.h>
#endif
#ifdef HAVE_SYS_TIMERFD_H
#include <sys/timerfd.h>
#endif
#include <sys/uio.h>
#include <errno.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <stdbool.h>
#include <unistd.h>
#ifdef HAVE_GNU_LIB_NAMES_H
#include <gnu/lib-names.h>
#endif
#ifdef HAVE_RPC_RPC_H
#include <rpc/rpc.h>
#endif
enum swrap_dbglvl_e {
SWRAP_LOG_ERROR = 0,
SWRAP_LOG_WARN,
SWRAP_LOG_DEBUG,
SWRAP_LOG_TRACE
};
/* GCC have printf type attribute check. */
#ifdef HAVE_FUNCTION_ATTRIBUTE_FORMAT
#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
#else
#define PRINTF_ATTRIBUTE(a,b)
#endif /* HAVE_FUNCTION_ATTRIBUTE_FORMAT */
#ifdef HAVE_DESTRUCTOR_ATTRIBUTE
#define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor))
#else
#define DESTRUCTOR_ATTRIBUTE
#endif
#ifdef HAVE_ADDRESS_SANITIZER_ATTRIBUTE
#define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE __attribute__((no_sanitize_address))
#else
#define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
#endif
#ifdef HAVE_GCC_THREAD_LOCAL_STORAGE
# define SWRAP_THREAD __thread
#else
# define SWRAP_THREAD
#endif
#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif
#ifndef ZERO_STRUCT
#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
#endif
#ifndef ZERO_STRUCTP
#define ZERO_STRUCTP(x) do { \
if ((x) != NULL) \
memset((char *)(x), 0, sizeof(*(x))); \
} while(0)
#endif
#ifndef discard_const
#define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
#endif
#ifndef discard_const_p
#define discard_const_p(type, ptr) ((type *)discard_const(ptr))
#endif
#ifdef IPV6_PKTINFO
# ifndef IPV6_RECVPKTINFO
# define IPV6_RECVPKTINFO IPV6_PKTINFO
# endif /* IPV6_RECVPKTINFO */
#endif /* IPV6_PKTINFO */
/*
* On BSD IP_PKTINFO has a different name because during
* the time when they implemented it, there was no RFC.
* The name for IPv6 is the same as on Linux.
*/
#ifndef IP_PKTINFO
# ifdef IP_RECVDSTADDR
# define IP_PKTINFO IP_RECVDSTADDR
# endif
#endif
#define SWRAP_DLIST_ADD(list,item) do { \
if (!(list)) { \
(item)->prev = NULL; \
(item)->next = NULL; \
(list) = (item); \
} else { \
(item)->prev = NULL; \
(item)->next = (list); \
(list)->prev = (item); \
(list) = (item); \
} \
} while (0)
#define SWRAP_DLIST_REMOVE(list,item) do { \
if ((list) == (item)) { \
(list) = (item)->next; \
if (list) { \
(list)->prev = NULL; \
} \
} else { \
if ((item)->prev) { \
(item)->prev->next = (item)->next; \
} \
if ((item)->next) { \
(item)->next->prev = (item)->prev; \
} \
} \
(item)->prev = NULL; \
(item)->next = NULL; \
} while (0)
#if defined(HAVE_GETTIMEOFDAY_TZ) || defined(HAVE_GETTIMEOFDAY_TZ_VOID)
#define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
#else
#define swrapGetTimeOfDay(tval) gettimeofday(tval)
#endif
/* we need to use a very terse format here as IRIX 6.4 silently
truncates names to 16 chars, so if we use a longer name then we
can't tell which port a packet came from with recvfrom()
with this format we have 8 chars left for the directory name
*/
#define SOCKET_FORMAT "%c%02X%04X"
#define SOCKET_TYPE_CHAR_TCP 'T'
#define SOCKET_TYPE_CHAR_UDP 'U'
#define SOCKET_TYPE_CHAR_TCP_V6 'X'
#define SOCKET_TYPE_CHAR_UDP_V6 'Y'
/*
* 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)
*/
#define SOCKET_MAX_PACKET 1500
#define SOCKET_MAX_SOCKETS 1024
/* This limit is to avoid broadcast sendto() needing to stat too many
* files. It may be raised (with a performance cost) to up to 254
* without changing the format above */
#define MAX_WRAPPED_INTERFACES 40
struct swrap_address {
socklen_t sa_socklen;
union {
struct sockaddr s;
struct sockaddr_in in;
#ifdef HAVE_IPV6
struct sockaddr_in6 in6;
#endif
struct sockaddr_un un;
struct sockaddr_storage ss;
} sa;
};
struct socket_info_fd {
struct socket_info_fd *prev, *next;
int fd;
};
struct socket_info
{
struct socket_info_fd *fds;
int family;
int type;
int protocol;
int bound;
int bcast;
int is_server;
int connected;
int defer_connect;
int pktinfo;
/* The unix path so we can unlink it on close() */
struct sockaddr_un un_addr;
struct swrap_address bindname;
struct swrap_address myname;
struct swrap_address peername;
struct {
unsigned long pck_snd;
unsigned long pck_rcv;
} io;
struct socket_info *prev, *next;
};
/*
* File descriptors are shared between threads so we should share socket
* information too.
*/
struct socket_info *sockets;
/* Function prototypes */
bool socket_wrapper_enabled(void);
void swrap_destructor(void) DESTRUCTOR_ATTRIBUTE;
#ifdef NDEBUG
# define SWRAP_LOG(...)
#else
static void swrap_log(enum swrap_dbglvl_e dbglvl, const char *func, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
# define SWRAP_LOG(dbglvl, ...) swrap_log((dbglvl), __func__, __VA_ARGS__)
static void swrap_log(enum swrap_dbglvl_e dbglvl,
const char *func,
const char *format, ...)
{
char buffer[1024];
va_list va;
const char *d;
unsigned int lvl = 0;
d = getenv("SOCKET_WRAPPER_DEBUGLEVEL");
if (d != NULL) {
lvl = atoi(d);
}
va_start(va, format);
vsnprintf(buffer, sizeof(buffer), format, va);
va_end(va);
if (lvl >= dbglvl) {
switch (dbglvl) {
case SWRAP_LOG_ERROR:
fprintf(stderr,
"SWRAP_ERROR(%d) - %s: %s\n",
(int)getpid(), func, buffer);
break;
case SWRAP_LOG_WARN:
fprintf(stderr,
"SWRAP_WARN(%d) - %s: %s\n",
(int)getpid(), func, buffer);
break;
case SWRAP_LOG_DEBUG:
fprintf(stderr,
"SWRAP_DEBUG(%d) - %s: %s\n",
(int)getpid(), func, buffer);
break;
case SWRAP_LOG_TRACE:
fprintf(stderr,
"SWRAP_TRACE(%d) - %s: %s\n",
(int)getpid(), func, buffer);
break;
}
}
}
#endif
/*********************************************************
* SWRAP LOADING LIBC FUNCTIONS
*********************************************************/
#include <dlfcn.h>
struct swrap_libc_fns {
int (*libc_accept)(int sockfd,
struct sockaddr *addr,
socklen_t *addrlen);
int (*libc_bind)(int sockfd,
const struct sockaddr *addr,
socklen_t addrlen);
int (*libc_close)(int fd);
int (*libc_connect)(int sockfd,
const struct sockaddr *addr,
socklen_t addrlen);
int (*libc_dup)(int fd);
int (*libc_dup2)(int oldfd, int newfd);
int (*libc_fcntl)(int fd, int cmd, ...);
FILE *(*libc_fopen)(const char *name, const char *mode);
#ifdef HAVE_EVENTFD
int (*libc_eventfd)(int count, int flags);
#endif
int (*libc_getpeername)(int sockfd,
struct sockaddr *addr,
socklen_t *addrlen);
int (*libc_getsockname)(int sockfd,
struct sockaddr *addr,
socklen_t *addrlen);
int (*libc_getsockopt)(int sockfd,
int level,
int optname,
void *optval,
socklen_t *optlen);
int (*libc_ioctl)(int d, unsigned long int request, ...);
int (*libc_listen)(int sockfd, int backlog);
int (*libc_open)(const char *pathname, int flags, mode_t mode);
int (*libc_pipe)(int pipefd[2]);
int (*libc_read)(int fd, void *buf, size_t count);
ssize_t (*libc_readv)(int fd, const struct iovec *iov, int iovcnt);
int (*libc_recv)(int sockfd, void *buf, size_t len, int flags);
int (*libc_recvfrom)(int sockfd,
void *buf,
size_t len,
int flags,
struct sockaddr *src_addr,
socklen_t *addrlen);
int (*libc_recvmsg)(int sockfd, const struct msghdr *msg, int flags);
int (*libc_send)(int sockfd, const void *buf, size_t len, int flags);
int (*libc_sendmsg)(int sockfd, const struct msghdr *msg, int flags);
int (*libc_sendto)(int sockfd,
const void *buf,
size_t len,
int flags,
const struct sockaddr *dst_addr,
socklen_t addrlen);
int (*libc_setsockopt)(int sockfd,
int level,
int optname,
const void *optval,
socklen_t optlen);
#ifdef HAVE_SIGNALFD
int (*libc_signalfd)(int fd, const sigset_t *mask, int flags);
#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_writev)(int fd, const struct iovec *iov, int iovcnt);
};
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.
*/
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);
}
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_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;
}
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 *)malloc(alloc_len);
if (base == NULL) {
return NULL;
}
memset(base, 0x0, alloc_len);
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;
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 *)malloc(sizeof(struct socket_info));
memset(si, 0, 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)
{
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) {
return libc_accept(s, addr, addrlen);
}
/*
* 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;
}
ret = libc_accept(s, &un_addr.sa.s, &un_addr.sa_socklen);
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 *)malloc(sizeof(struct socket_info));
memset(child_si, 0, sizeof(struct socket_info));
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_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);
}
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);
}
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);
}
}
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);
}
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_SPACE(cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)));
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:
if (!si->connected) {
errno = ENOTCONN;
return -1;
}
if (msg->msg_iovlen == 0) {
break;
}
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
size_t nlen;
nlen = len + msg->msg_iov[i].iov_len;
if (nlen > SOCKET_MAX_PACKET) {
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, SOCKET_MAX_PACKET);
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) {
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:
if (!si->connected) {
errno = ENOTCONN;
return -1;
}
if (msg->msg_iovlen == 0) {
break;
}
for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
size_t nlen;
nlen = len + msg->msg_iov[i].iov_len;
if (nlen > SOCKET_MAX_PACKET) {
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, SOCKET_MAX_PACKET);
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;
}
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) {
rc = sockaddr_convert_from_un(si,
un_addr,
un_addrlen,
si->family,
msg->msg_name,
&msg->msg_namelen);
if (rc == -1) {
goto done;
}
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;
}
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);
}
/****************************************************************************
* 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 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);
msg.msg_name = omsg->msg_name;
msg.msg_namelen = omsg->msg_namelen;
#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
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;
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);
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
/****************************
* 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;
}
}
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