diff options
Diffstat (limited to 'tests/deckard/contrib/libswrap/src/socket_wrapper.c')
| -rw-r--r-- | tests/deckard/contrib/libswrap/src/socket_wrapper.c | 5475 |
1 files changed, 5475 insertions, 0 deletions
diff --git a/tests/deckard/contrib/libswrap/src/socket_wrapper.c b/tests/deckard/contrib/libswrap/src/socket_wrapper.c new file mode 100644 index 0000000..bc4f4ab --- /dev/null +++ b/tests/deckard/contrib/libswrap/src/socket_wrapper.c @@ -0,0 +1,5475 @@ +/* + * 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 +#include <dirent.h> + +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' + + +#define SOCKET_FORMAT_LONG "%c%08X%04X" +#define SOCKET_FORMAT_V6_LONG "%c%08X%08X%08X%08X%04X" + +#define SOCKET_TYPE_CHAR_TCP_LONG 'Q' +#define SOCKET_TYPE_CHAR_UDP_LONG 'W' +#define SOCKET_TYPE_CHAR_TCP_V6_LONG 'E' +#define SOCKET_TYPE_CHAR_UDP_V6_LONG 'R' + +/* + * Set the packet MTU to 1500 bytes for stream sockets to make it it easier to + * format PCAP capture files (as the caller will simply continue from here). + */ +#define SOCKET_WRAPPER_MTU_DEFAULT 1500 +#define SOCKET_WRAPPER_MTU_MIN 512 +#define SOCKET_WRAPPER_MTU_MAX 32768 + +#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; + int tcp_nodelay; + + /* 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 { +#ifdef HAVE_ACCEPT4 + int (*libc_accept4)(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen, + int flags); +#else + int (*libc_accept)(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen); +#endif + 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_write)(int fd, const void *buf, size_t count); + 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. + */ +#ifdef HAVE_ACCEPT4 +static int libc_accept4(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen, + int flags) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, accept4); + + return swrap.fns.libc_accept4(sockfd, addr, addrlen, flags); +} + +#else /* HAVE_ACCEPT4 */ + +static int libc_accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, accept); + + return swrap.fns.libc_accept(sockfd, addr, addrlen); +} +#endif /* HAVE_ACCEPT4 */ + +static int libc_bind(int sockfd, + const struct sockaddr *addr, + socklen_t addrlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, bind); + + return swrap.fns.libc_bind(sockfd, addr, addrlen); +} + +static int libc_close(int fd) +{ + swrap_load_lib_function(SWRAP_LIBC, close); + + return swrap.fns.libc_close(fd); +} + +static int libc_connect(int sockfd, + const struct sockaddr *addr, + socklen_t addrlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, connect); + + return swrap.fns.libc_connect(sockfd, addr, addrlen); +} + +static int libc_dup(int fd) +{ + swrap_load_lib_function(SWRAP_LIBC, dup); + + return swrap.fns.libc_dup(fd); +} + +static int libc_dup2(int oldfd, int newfd) +{ + swrap_load_lib_function(SWRAP_LIBC, dup2); + + return swrap.fns.libc_dup2(oldfd, newfd); +} + +#ifdef HAVE_EVENTFD +static int libc_eventfd(int count, int flags) +{ + swrap_load_lib_function(SWRAP_LIBC, eventfd); + + return swrap.fns.libc_eventfd(count, flags); +} +#endif + +DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE +static int libc_vfcntl(int fd, int cmd, va_list ap) +{ + long int args[4]; + int rc; + int i; + + swrap_load_lib_function(SWRAP_LIBC, fcntl); + + for (i = 0; i < 4; i++) { + args[i] = va_arg(ap, long int); + } + + rc = swrap.fns.libc_fcntl(fd, + cmd, + args[0], + args[1], + args[2], + args[3]); + + return rc; +} + +static int libc_getpeername(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, getpeername); + + return swrap.fns.libc_getpeername(sockfd, addr, addrlen); +} + +static int libc_getsockname(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, getsockname); + + return swrap.fns.libc_getsockname(sockfd, addr, addrlen); +} + +static int libc_getsockopt(int sockfd, + int level, + int optname, + void *optval, + socklen_t *optlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, getsockopt); + + return swrap.fns.libc_getsockopt(sockfd, level, optname, optval, optlen); +} + +DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE +static int libc_vioctl(int d, unsigned long int request, va_list ap) +{ + long int args[4]; + int rc; + int i; + + swrap_load_lib_function(SWRAP_LIBC, ioctl); + + for (i = 0; i < 4; i++) { + args[i] = va_arg(ap, long int); + } + + rc = swrap.fns.libc_ioctl(d, + request, + args[0], + args[1], + args[2], + args[3]); + + return rc; +} + +static int libc_listen(int sockfd, int backlog) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, listen); + + return swrap.fns.libc_listen(sockfd, backlog); +} + +static FILE *libc_fopen(const char *name, const char *mode) +{ + swrap_load_lib_function(SWRAP_LIBC, fopen); + + return swrap.fns.libc_fopen(name, mode); +} + +static int libc_vopen(const char *pathname, int flags, va_list ap) +{ + long int mode = 0; + int fd; + + swrap_load_lib_function(SWRAP_LIBC, open); + + mode = va_arg(ap, long int); + + fd = swrap.fns.libc_open(pathname, flags, (mode_t)mode); + + return fd; +} + +static int libc_open(const char *pathname, int flags, ...) +{ + va_list ap; + int fd; + + va_start(ap, flags); + fd = libc_vopen(pathname, flags, ap); + va_end(ap); + + return fd; +} + +static int libc_pipe(int pipefd[2]) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, pipe); + + return swrap.fns.libc_pipe(pipefd); +} + +static int libc_read(int fd, void *buf, size_t count) +{ + swrap_load_lib_function(SWRAP_LIBC, read); + + return swrap.fns.libc_read(fd, buf, count); +} + +static ssize_t libc_readv(int fd, const struct iovec *iov, int iovcnt) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, readv); + + return swrap.fns.libc_readv(fd, iov, iovcnt); +} + +static int libc_recv(int sockfd, void *buf, size_t len, int flags) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, recv); + + return swrap.fns.libc_recv(sockfd, buf, len, flags); +} + +static int libc_recvfrom(int sockfd, + void *buf, + size_t len, + int flags, + struct sockaddr *src_addr, + socklen_t *addrlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, recvfrom); + + return swrap.fns.libc_recvfrom(sockfd, buf, len, flags, src_addr, addrlen); +} + +static int libc_recvmsg(int sockfd, struct msghdr *msg, int flags) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, recvmsg); + + return swrap.fns.libc_recvmsg(sockfd, msg, flags); +} + +static int libc_send(int sockfd, const void *buf, size_t len, int flags) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, send); + + return swrap.fns.libc_send(sockfd, buf, len, flags); +} + +static int libc_sendmsg(int sockfd, const struct msghdr *msg, int flags) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, sendmsg); + + return swrap.fns.libc_sendmsg(sockfd, msg, flags); +} + +static int libc_sendto(int sockfd, + const void *buf, + size_t len, + int flags, + const struct sockaddr *dst_addr, + socklen_t addrlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, sendto); + + return swrap.fns.libc_sendto(sockfd, buf, len, flags, dst_addr, addrlen); +} + +static int libc_setsockopt(int sockfd, + int level, + int optname, + const void *optval, + socklen_t optlen) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, setsockopt); + + return swrap.fns.libc_setsockopt(sockfd, level, optname, optval, optlen); +} + +#ifdef HAVE_SIGNALFD +static int libc_signalfd(int fd, const sigset_t *mask, int flags) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, signalfd); + + return swrap.fns.libc_signalfd(fd, mask, flags); +} +#endif + +static int libc_socket(int domain, int type, int protocol) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, socket); + + return swrap.fns.libc_socket(domain, type, protocol); +} + +static int libc_socketpair(int domain, int type, int protocol, int sv[2]) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, socketpair); + + return swrap.fns.libc_socketpair(domain, type, protocol, sv); +} + +#ifdef HAVE_TIMERFD_CREATE +static int libc_timerfd_create(int clockid, int flags) +{ + swrap_load_lib_function(SWRAP_LIBC, timerfd_create); + + return swrap.fns.libc_timerfd_create(clockid, flags); +} +#endif + +static ssize_t libc_write(int fd, const void *buf, size_t count) +{ + swrap_load_lib_function(SWRAP_LIBC, write); + + return swrap.fns.libc_write(fd, buf, count); +} + +static ssize_t libc_writev(int fd, const struct iovec *iov, int iovcnt) +{ + swrap_load_lib_function(SWRAP_LIBSOCKET, writev); + + return swrap.fns.libc_writev(fd, iov, iovcnt); +} + +/********************************************************* + * SWRAP HELPER FUNCTIONS + *********************************************************/ + +#ifdef HAVE_IPV6 +/* + * FD00::5357:5FXX + */ +static const struct in6_addr *swrap_ipv6(void) +{ + static struct in6_addr v; + static int initialized; + int ret; + + if (initialized) { + return &v; + } + initialized = 1; + + ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v); + if (ret <= 0) { + abort(); + } + + return &v; +} +static struct in6_addr swrap_make_ipv6(unsigned int a0, unsigned int a1, + unsigned int a2, unsigned int a3) +{ + struct in6_addr v; + int i; + for (i = 0 ; i < 4; i++) + { + v.s6_addr[ 0 + i] = a0; + v.s6_addr[ 4 + i] = a1; + v.s6_addr[ 8 + i] = a2; + v.s6_addr[12 + i] = a3; + a0 >>= 8; + a1 >>= 8; + a2 >>= 8; + a3 >>= 8; + } + return v; +} +static void swrap_make_ipv6_ints(const unsigned char s[16], unsigned int *a0, unsigned int *a1, + unsigned int *a2, unsigned int *a3) +{ + int i; + + *a0 = 0; *a1 = 0; *a2 = 0; *a3 = 0; + for (i = 3 ; i > 0; i--) + { + *a0 += s[ 0 + i]; + *a1 += s[ 4 + i]; + *a2 += s[ 8 + i]; + *a3 += s[12 + i]; + *a0 <<= 8; + *a1 <<= 8; + *a2 <<= 8; + *a3 <<= 8; + } + *a0 += s[ 0]; + *a1 += s[ 4]; + *a2 += s[ 8]; + *a3 += s[12]; +} + +#endif + +static void set_port(int family, int prt, struct swrap_address *addr) +{ + switch (family) { + case AF_INET: + addr->sa.in.sin_port = htons(prt); + break; +#ifdef HAVE_IPV6 + case AF_INET6: + addr->sa.in6.sin6_port = htons(prt); + break; +#endif + } +} + +static size_t socket_length(int family) +{ + switch (family) { + case AF_INET: + return sizeof(struct sockaddr_in); +#ifdef HAVE_IPV6 + case AF_INET6: + return sizeof(struct sockaddr_in6); +#endif + } + return 0; +} + +static const char *socket_wrapper_dir(void) +{ + const char *s = getenv("SOCKET_WRAPPER_DIR"); + if (s == NULL) { + return NULL; + } + /* TODO use realpath(3) here, when we add support for threads */ + if (strncmp(s, "./", 2) == 0) { + s += 2; + } + + SWRAP_LOG(SWRAP_LOG_TRACE, "socket_wrapper_dir: %s", s); + return s; +} + +static unsigned int socket_wrapper_mtu(void) +{ + static unsigned int max_mtu = 0; + unsigned int tmp; + const char *s; + char *endp; + + if (max_mtu != 0) { + return max_mtu; + } + + max_mtu = SOCKET_WRAPPER_MTU_DEFAULT; + + s = getenv("SOCKET_WRAPPER_MTU"); + if (s == NULL) { + goto done; + } + + tmp = strtol(s, &endp, 10); + if (s == endp) { + goto done; + } + + if (tmp < SOCKET_WRAPPER_MTU_MIN || tmp > SOCKET_WRAPPER_MTU_MAX) { + goto done; + } + max_mtu = tmp; + +done: + return max_mtu; +} + +bool socket_wrapper_enabled(void) +{ + const char *s = socket_wrapper_dir(); + + return s != NULL ? true : false; +} + +static unsigned int socket_wrapper_default_iface(void) +{ + const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE"); + if (s) { + unsigned int iface; + if (sscanf(s, "%u", &iface) == 1) { + if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) { + return iface; + } + } + } + + return 1;/* 127.0.0.1 */ +} + +static unsigned int socket_wrapper_default_addr(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 (127<<24) | iface; + } + } + } + return (127<<24) | 0x00000001; /* 127.0.0.1 */ +} + +static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len) +{ + unsigned int prt; + const char *p; + char type; + + p = strrchr(un->sun_path, '/'); + if (p) p++; else p = un->sun_path; + + type = p[0]; + + + switch(type) { + case SOCKET_TYPE_CHAR_TCP_LONG: + case SOCKET_TYPE_CHAR_UDP_LONG: { + unsigned int in4_addr; + struct sockaddr_in *in2 = (struct sockaddr_in *)(void *)in; + + if ((*len) < sizeof(*in2)) { + errno = EINVAL; + return -1; + } + + if (sscanf(p, SOCKET_FORMAT_LONG, &type, &in4_addr, &prt) != 3) { + errno = EINVAL; + return -1; + } + + if (prt > 0xFFFF) { + errno = EINVAL; + return -1; + } + + memset(in2, 0, sizeof(*in2)); + in2->sin_family = AF_INET; + in2->sin_addr.s_addr = htonl(in4_addr); + in2->sin_port = htons(prt); + + *len = sizeof(*in2); + break; + } +#ifdef HAVE_IPV6 + case SOCKET_TYPE_CHAR_TCP_V6_LONG: + case SOCKET_TYPE_CHAR_UDP_V6_LONG: { + unsigned int in6_a0, in6_a1, in6_a2, in6_a3; + struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)(void *)in; + + if (sscanf(p, SOCKET_FORMAT_V6_LONG, &type, + &in6_a0, &in6_a1, &in6_a2, &in6_a3, &prt) != 6) { + errno = EINVAL; + return -1; + } + + if ((*len) < sizeof(*in2)) { + errno = EINVAL; + return -1; + } + + memset(in2, 0, sizeof(*in2)); + in2->sin6_family = AF_INET6; + in2->sin6_addr = swrap_make_ipv6(in6_a0,in6_a1,in6_a2,in6_a3); + 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 in4_addr, in6_a0, in6_a1, in6_a2, in6_a3; + 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_LONG; + break; + case SOCK_DGRAM: + u_type = SOCKET_TYPE_CHAR_UDP_LONG; + a_type = SOCKET_TYPE_CHAR_UDP_LONG; + b_type = SOCKET_TYPE_CHAR_UDP_LONG; + 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; + in4_addr = socket_wrapper_default_addr(); + } else if (b_type && addr == 0x7FFFFFFF) { + /* 127.255.255.255 only udp */ + is_bcast = 1; + type = b_type; + in4_addr = socket_wrapper_default_addr(); + } else { + is_bcast = 0; + type = u_type; + in4_addr = addr; + } + if (bcast) *bcast = is_bcast; + break; + } +#ifdef HAVE_IPV6 + case AF_INET6: { + const struct sockaddr_in6 *in = + (const struct sockaddr_in6 *)(const void *)inaddr; + + switch (si->type) { + case SOCK_STREAM: + type = SOCKET_TYPE_CHAR_TCP_V6_LONG; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP_V6_LONG; + break; + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n"); + errno = ESOCKTNOSUPPORT; + return -1; + } + + /* XXX no multicast/broadcast */ + + prt = ntohs(in->sin6_port); + + /* TODO - More checks */ + + swrap_make_ipv6_ints(in->sin6_addr.s6_addr,&in6_a0,&in6_a1,&in6_a2,&in6_a3); + 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; + } + + switch (inaddr->sa_family) { + case AF_INET: + snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT_LONG, + socket_wrapper_dir(), type, in4_addr, prt); + break; + case AF_INET6: + snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT_V6_LONG, + socket_wrapper_dir(), type, in6_a0, in6_a1, in6_a2, in6_a3, prt); + break; + } + 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 in4_addr, in6_a0, in6_a1, in6_a2, in6_a3; + 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_LONG; + d_type = SOCKET_TYPE_CHAR_TCP_LONG; + break; + case SOCK_DGRAM: + u_type = SOCKET_TYPE_CHAR_UDP_LONG; + d_type = SOCKET_TYPE_CHAR_UDP_LONG; + a_type = SOCKET_TYPE_CHAR_UDP_LONG; + b_type = SOCKET_TYPE_CHAR_UDP_LONG; + 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; + in4_addr = socket_wrapper_default_addr(); + } else if (a_type && addr == 0xFFFFFFFF) { + /* 255.255.255.255 only udp */ + is_bcast = 2; + type = a_type; + in4_addr = socket_wrapper_default_addr(); + } else if (b_type && addr == 0x7FFFFFFF) { + /* 127.255.255.255 only udp */ + is_bcast = 1; + type = b_type; + in4_addr = socket_wrapper_default_addr(); + } else { + /* 127.0.0.X */ + is_bcast = 0; + type = u_type; + in4_addr = addr; + } + + /* 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(in4_addr); + + 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 sockaddr_in6 in6_addr = *in; + + switch (si->type) { + case SOCK_STREAM: + type = SOCKET_TYPE_CHAR_TCP_V6_LONG; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP_V6_LONG; + break; + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n"); + errno = ESOCKTNOSUPPORT; + return -1; + } + + /* XXX no multicast/broadcast */ + + prt = ntohs(in->sin6_port); + + /* TODO - More checks */ + + if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) { + in6_addr.sin6_addr = *swrap_ipv6(); + in6_addr.sin6_addr.s6_addr[15] = socket_wrapper_default_iface(); + } + + swrap_make_ipv6_ints(in6_addr.sin6_addr.s6_addr,&in6_a0,&in6_a1,&in6_a2,&in6_a3); + + /* 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 = in6_addr.sin6_family; + bind_in.sin6_port = in6_addr.sin6_port; + + bind_in.sin6_addr = in6_addr.sin6_addr; + + 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 (prt == 0) { + /* handle auto-allocation of ephemeral ports */ + for (prt = 5001; prt < 10000; prt++) { + if (si->family == AF_INET) + snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT_LONG, + socket_wrapper_dir(), type, in4_addr, prt); + else + snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT_V6_LONG, + socket_wrapper_dir(), type, in6_a0,in6_a1, in6_a2, in6_a3, 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; + } + } + + if (si->family == AF_INET) + snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT_LONG, + socket_wrapper_dir(), type, in4_addr, prt); + else + snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT_V6_LONG, + socket_wrapper_dir(), type, in6_a0,in6_a1, in6_a2, in6_a3, 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 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) { + // printf("return: 1\n"); + // return s; + // } + // initialized = 1; + + /* + * TODO: don't use the structs use plain buffer offsets + * and PUSH_U8(), PUSH_U16() and PUSH_U32() + * + * for now make sure we disable PCAP support + * if the struct has alignment! + */ + if (sizeof(h) != SWRAP_FILE_HDR_SIZE) { + return NULL; + } + if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) { + return NULL; + } + if (sizeof(i) != SWRAP_PACKET_IP_SIZE) { + return NULL; + } + if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) { + return NULL; + } + if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) { + return NULL; + } + if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) { + return NULL; + } + if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) { + return NULL; + } + if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) { + return NULL; + } + if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) { + return NULL; + } + if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) { + return NULL; + } + + s = getenv("SOCKET_WRAPPER_PCAP_FILE"); + if (s == NULL) { + return NULL; + } + if (strncmp(s, "./", 2) == 0) { + s += 2; + } + return s; +} + +static uint8_t *swrap_pcap_packet_init(struct timeval *tval, + const struct sockaddr *src, + const struct sockaddr *dest, + int socket_type, + const uint8_t *payload, + size_t payload_len, + unsigned long tcp_seqno, + unsigned long tcp_ack, + unsigned char tcp_ctl, + int unreachable, + size_t *_packet_len) +{ + uint8_t *base; + uint8_t *buf; + struct swrap_packet_frame *frame; + union swrap_packet_ip *ip; + union swrap_packet_payload *pay; + size_t packet_len; + size_t alloc_len; + size_t nonwire_len = sizeof(*frame); + size_t wire_hdr_len = 0; + size_t wire_len = 0; + size_t ip_hdr_len = 0; + size_t icmp_hdr_len = 0; + size_t icmp_truncate_len = 0; + uint8_t protocol = 0, icmp_protocol = 0; + const struct sockaddr_in *src_in = NULL; + const struct sockaddr_in *dest_in = NULL; +#ifdef HAVE_IPV6 + const struct sockaddr_in6 *src_in6 = NULL; + const struct sockaddr_in6 *dest_in6 = NULL; +#endif + uint16_t src_port; + uint16_t dest_port; + + switch (src->sa_family) { + case AF_INET: + src_in = (const struct sockaddr_in *)(const void *)src; + dest_in = (const struct sockaddr_in *)(const void *)dest; + src_port = src_in->sin_port; + dest_port = dest_in->sin_port; + ip_hdr_len = sizeof(ip->v4); + break; +#ifdef HAVE_IPV6 + case AF_INET6: + src_in6 = (const struct sockaddr_in6 *)(const void *)src; + dest_in6 = (const struct sockaddr_in6 *)(const void *)dest; + src_port = src_in6->sin6_port; + dest_port = dest_in6->sin6_port; + ip_hdr_len = sizeof(ip->v6); + break; +#endif + default: + return NULL; + } + + switch (socket_type) { + case SOCK_STREAM: + protocol = 0x06; /* TCP */ + wire_hdr_len = ip_hdr_len + sizeof(pay->tcp); + wire_len = wire_hdr_len + payload_len; + break; + + case SOCK_DGRAM: + protocol = 0x11; /* UDP */ + wire_hdr_len = ip_hdr_len + sizeof(pay->udp); + wire_len = wire_hdr_len + payload_len; + break; + + default: + return NULL; + } + + if (unreachable) { + icmp_protocol = protocol; + switch (src->sa_family) { + case AF_INET: + protocol = 0x01; /* ICMPv4 */ + icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4); + break; +#ifdef HAVE_IPV6 + case AF_INET6: + protocol = 0x3A; /* ICMPv6 */ + icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6); + break; +#endif + } + if (wire_len > 64 ) { + icmp_truncate_len = wire_len - 64; + } + wire_hdr_len += icmp_hdr_len; + wire_len += icmp_hdr_len; + } + + packet_len = nonwire_len + wire_len; + alloc_len = packet_len; + if (alloc_len < SWRAP_PACKET_MIN_ALLOC) { + alloc_len = SWRAP_PACKET_MIN_ALLOC; + } + + base = (uint8_t *)calloc(1, alloc_len); + if (base == NULL) { + return NULL; + } + + buf = base; + + frame = (struct swrap_packet_frame *)(void *)buf; + frame->seconds = tval->tv_sec; + frame->micro_seconds = tval->tv_usec; + frame->recorded_length = wire_len - icmp_truncate_len; + frame->full_length = wire_len - icmp_truncate_len; + buf += SWRAP_PACKET_FRAME_SIZE; + + ip = (union swrap_packet_ip *)(void *)buf; + switch (src->sa_family) { + case AF_INET: + ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */ + ip->v4.tos = 0x00; + ip->v4.packet_length = htons(wire_len - icmp_truncate_len); + ip->v4.identification = htons(0xFFFF); + ip->v4.flags = 0x40; /* BIT 1 set - means don't fragment */ + ip->v4.fragment = htons(0x0000); + ip->v4.ttl = 0xFF; + ip->v4.protocol = protocol; + ip->v4.hdr_checksum = htons(0x0000); + ip->v4.src_addr = src_in->sin_addr.s_addr; + ip->v4.dest_addr = dest_in->sin_addr.s_addr; + buf += SWRAP_PACKET_IP_V4_SIZE; + break; +#ifdef HAVE_IPV6 + case AF_INET6: + ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */ + ip->v6.flow_label_high = 0x00; + ip->v6.flow_label_low = 0x0000; + ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */ + ip->v6.next_header = protocol; + memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16); + memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16); + buf += SWRAP_PACKET_IP_V6_SIZE; + break; +#endif + } + + if (unreachable) { + pay = (union swrap_packet_payload *)(void *)buf; + switch (src->sa_family) { + case AF_INET: + pay->icmp4.type = 0x03; /* destination unreachable */ + pay->icmp4.code = 0x01; /* host unreachable */ + pay->icmp4.checksum = htons(0x0000); + pay->icmp4.unused = htonl(0x00000000); + buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE; + + /* set the ip header in the ICMP payload */ + ip = (union swrap_packet_ip *)(void *)buf; + ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */ + ip->v4.tos = 0x00; + ip->v4.packet_length = htons(wire_len - icmp_hdr_len); + ip->v4.identification = htons(0xFFFF); + ip->v4.flags = 0x40; /* BIT 1 set - means don't fragment */ + ip->v4.fragment = htons(0x0000); + ip->v4.ttl = 0xFF; + ip->v4.protocol = icmp_protocol; + ip->v4.hdr_checksum = htons(0x0000); + ip->v4.src_addr = dest_in->sin_addr.s_addr; + ip->v4.dest_addr = src_in->sin_addr.s_addr; + buf += SWRAP_PACKET_IP_V4_SIZE; + + src_port = dest_in->sin_port; + dest_port = src_in->sin_port; + break; +#ifdef HAVE_IPV6 + case AF_INET6: + pay->icmp6.type = 0x01; /* destination unreachable */ + pay->icmp6.code = 0x03; /* address unreachable */ + pay->icmp6.checksum = htons(0x0000); + pay->icmp6.unused = htonl(0x00000000); + buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE; + + /* set the ip header in the ICMP payload */ + ip = (union swrap_packet_ip *)(void *)buf; + ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */ + ip->v6.flow_label_high = 0x00; + ip->v6.flow_label_low = 0x0000; + ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */ + ip->v6.next_header = protocol; + memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16); + memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16); + buf += SWRAP_PACKET_IP_V6_SIZE; + + src_port = dest_in6->sin6_port; + dest_port = src_in6->sin6_port; + break; +#endif + } + } + + pay = (union swrap_packet_payload *)(void *)buf; + + switch (socket_type) { + case SOCK_STREAM: + pay->tcp.source_port = src_port; + pay->tcp.dest_port = dest_port; + pay->tcp.seq_num = htonl(tcp_seqno); + pay->tcp.ack_num = htonl(tcp_ack); + pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */ + pay->tcp.control = tcp_ctl; + pay->tcp.window = htons(0x7FFF); + pay->tcp.checksum = htons(0x0000); + pay->tcp.urg = htons(0x0000); + buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE; + + break; + + case SOCK_DGRAM: + pay->udp.source_port = src_port; + pay->udp.dest_port = dest_port; + pay->udp.length = htons(8 + payload_len); + pay->udp.checksum = htons(0x0000); + buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE; + + break; + } + + if (payload && payload_len > 0) { + memcpy(buf, payload, payload_len); + } + + *_packet_len = packet_len - icmp_truncate_len; + return base; +} + +static int swrap_pcap_get_fd(const char *fname) +{ + 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) { + close(fd); + free(packet); + return; + } + } + close(fd); + free(packet); +} + +/**************************************************************************** + * SIGNALFD + ***************************************************************************/ + +#ifdef HAVE_SIGNALFD +static int swrap_signalfd(int fd, const sigset_t *mask, int flags) +{ + int rc; + + rc = libc_signalfd(fd, mask, flags); + if (rc != -1) { + swrap_remove_stale(fd); + } + + return rc; +} + +int signalfd(int fd, const sigset_t *mask, int flags) +{ + return swrap_signalfd(fd, mask, flags); +} +#endif + +/**************************************************************************** + * SOCKET + ***************************************************************************/ + +static int swrap_socket(int family, int type, int protocol) +{ + struct socket_info *si; + struct socket_info_fd *fi; + int fd; + int real_type = type; + + /* + * Remove possible addition flags passed to socket() so + * do not fail checking the type. + * See https://lwn.net/Articles/281965/ + */ +#ifdef SOCK_CLOEXEC + real_type &= ~SOCK_CLOEXEC; +#endif +#ifdef SOCK_NONBLOCK + real_type &= ~SOCK_NONBLOCK; +#endif + + if (!socket_wrapper_enabled()) { + return libc_socket(family, type, protocol); + } + + switch (family) { + case AF_INET: +#ifdef HAVE_IPV6 + case AF_INET6: +#endif + break; +#ifdef AF_NETLINK + case AF_NETLINK: +#endif /* AF_NETLINK */ +#ifdef AF_PACKET + case AF_PACKET: +#endif /* AF_PACKET */ + case AF_UNIX: + return libc_socket(family, type, protocol); + default: + errno = EAFNOSUPPORT; + return -1; + } + + switch (real_type) { + case SOCK_STREAM: + break; + case SOCK_DGRAM: + break; + default: + errno = EPROTONOSUPPORT; + return -1; + } + + switch (protocol) { + case 0: + break; + case 6: + if (real_type == SOCK_STREAM) { + break; + } + /*fall through*/ + case 17: + if (real_type == SOCK_DGRAM) { + break; + } + /*fall through*/ + default: + errno = EPROTONOSUPPORT; + return -1; + } + + /* + * We must call libc_socket with type, from the caller, not the version + * we removed SOCK_CLOEXEC and SOCK_NONBLOCK from + */ + fd = libc_socket(AF_UNIX, type, 0); + + if (fd == -1) { + return -1; + } + + /* Check if we have a stale fd and remove it */ + si = find_socket_info(fd); + if (si != NULL) { + swrap_remove_stale(fd); + } + + si = (struct socket_info *)calloc(1, sizeof(struct socket_info)); + if (si == NULL) { + errno = ENOMEM; + return -1; + } + + si->family = family; + + /* however, the rest of the socket_wrapper code expects just + * the type, not the flags */ + si->type = real_type; + si->protocol = protocol; + + /* + * Setup myname so getsockname() can succeed to find out the socket + * type. + */ + switch(si->family) { + case AF_INET: { + struct sockaddr_in sin = { + .sin_family = AF_INET, + }; + + si->myname.sa_socklen = sizeof(struct sockaddr_in); + memcpy(&si->myname.sa.in, &sin, si->myname.sa_socklen); + break; + } + case AF_INET6: { + struct sockaddr_in6 sin6 = { + .sin6_family = AF_INET6, + }; + + si->myname.sa_socklen = sizeof(struct sockaddr_in6); + memcpy(&si->myname.sa.in6, &sin6, si->myname.sa_socklen); + break; + } + default: + free(si); + errno = EINVAL; + return -1; + } + + fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd)); + if (fi == NULL) { + free(si); + errno = ENOMEM; + return -1; + } + + fi->fd = fd; + + SWRAP_DLIST_ADD(si->fds, fi); + SWRAP_DLIST_ADD(sockets, si); + + SWRAP_LOG(SWRAP_LOG_TRACE, + "Created %s socket for protocol %s", + si->family == AF_INET ? "IPv4" : "IPv6", + si->type == SOCK_DGRAM ? "UDP" : "TCP"); + + return fd; +} + +int socket(int family, int type, int protocol) +{ + return swrap_socket(family, type, protocol); +} + +/**************************************************************************** + * SOCKETPAIR + ***************************************************************************/ + +static int swrap_socketpair(int family, int type, int protocol, int sv[2]) +{ + int rc; + + rc = libc_socketpair(family, type, protocol, sv); + if (rc != -1) { + swrap_remove_stale(sv[0]); + swrap_remove_stale(sv[1]); + } + + return rc; +} + +int socketpair(int family, int type, int protocol, int sv[2]) +{ + return swrap_socketpair(family, type, protocol, sv); +} + +/**************************************************************************** + * SOCKETPAIR + ***************************************************************************/ + +#ifdef HAVE_TIMERFD_CREATE +static int swrap_timerfd_create(int clockid, int flags) +{ + int fd; + + fd = libc_timerfd_create(clockid, flags); + if (fd != -1) { + swrap_remove_stale(fd); + } + + return fd; +} + +int timerfd_create(int clockid, int flags) +{ + return swrap_timerfd_create(clockid, flags); +} +#endif + +/**************************************************************************** + * PIPE + ***************************************************************************/ + +static int swrap_pipe(int pipefd[2]) +{ + int rc; + + rc = libc_pipe(pipefd); + if (rc != -1) { + swrap_remove_stale(pipefd[0]); + swrap_remove_stale(pipefd[1]); + } + + return rc; +} + +int pipe(int pipefd[2]) +{ + return swrap_pipe(pipefd); +} + +/**************************************************************************** + * ACCEPT + ***************************************************************************/ + +static int swrap_accept(int s, + struct sockaddr *addr, + socklen_t *addrlen, + int flags) +{ + struct socket_info *parent_si, *child_si; + struct socket_info_fd *child_fi; + int fd; + struct swrap_address un_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + struct swrap_address un_my_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + struct swrap_address in_addr = { + .sa_socklen = sizeof(struct sockaddr_storage), + }; + struct swrap_address in_my_addr = { + .sa_socklen = sizeof(struct sockaddr_storage), + }; + int ret; + + parent_si = find_socket_info(s); + if (!parent_si) { +#ifdef HAVE_ACCEPT4 + return libc_accept4(s, addr, addrlen, flags); +#else + return libc_accept(s, addr, addrlen); +#endif + } + + /* + * assume out sockaddr have the same size as the in parent + * socket family + */ + in_addr.sa_socklen = socket_length(parent_si->family); + if (in_addr.sa_socklen <= 0) { + errno = EINVAL; + return -1; + } + +#ifdef HAVE_ACCEPT4 + ret = libc_accept4(s, &un_addr.sa.s, &un_addr.sa_socklen, flags); +#else + ret = libc_accept(s, &un_addr.sa.s, &un_addr.sa_socklen); +#endif + if (ret == -1) { + if (errno == ENOTSOCK) { + /* Remove stale fds */ + swrap_remove_stale(s); + } + return ret; + } + + fd = ret; + + ret = sockaddr_convert_from_un(parent_si, + &un_addr.sa.un, + un_addr.sa_socklen, + parent_si->family, + &in_addr.sa.s, + &in_addr.sa_socklen); + if (ret == -1) { + close(fd); + return ret; + } + + child_si = (struct socket_info *)calloc(1, sizeof(struct socket_info)); + if (child_si == NULL) { + close(fd); + errno = ENOMEM; + return -1; + } + + child_fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd)); + if (child_fi == NULL) { + free(child_si); + close(fd); + errno = ENOMEM; + return -1; + } + + child_fi->fd = fd; + + SWRAP_DLIST_ADD(child_si->fds, child_fi); + + child_si->family = parent_si->family; + child_si->type = parent_si->type; + child_si->protocol = parent_si->protocol; + child_si->bound = 1; + child_si->is_server = 1; + child_si->connected = 1; + + child_si->peername = (struct swrap_address) { + .sa_socklen = in_addr.sa_socklen, + }; + memcpy(&child_si->peername.sa.ss, &in_addr.sa.ss, in_addr.sa_socklen); + + if (addr != NULL && addrlen != NULL) { + size_t copy_len = MIN(*addrlen, in_addr.sa_socklen); + if (copy_len > 0) { + memcpy(addr, &in_addr.sa.ss, copy_len); + } + *addrlen = in_addr.sa_socklen; + } + + ret = libc_getsockname(fd, + &un_my_addr.sa.s, + &un_my_addr.sa_socklen); + if (ret == -1) { + free(child_fi); + free(child_si); + close(fd); + return ret; + } + + ret = sockaddr_convert_from_un(child_si, + &un_my_addr.sa.un, + un_my_addr.sa_socklen, + child_si->family, + &in_my_addr.sa.s, + &in_my_addr.sa_socklen); + if (ret == -1) { + free(child_fi); + free(child_si); + close(fd); + return ret; + } + + SWRAP_LOG(SWRAP_LOG_TRACE, + "accept() path=%s, fd=%d", + un_my_addr.sa.un.sun_path, s); + + child_si->myname = (struct swrap_address) { + .sa_socklen = in_my_addr.sa_socklen, + }; + memcpy(&child_si->myname.sa.ss, &in_my_addr.sa.ss, in_my_addr.sa_socklen); + + SWRAP_DLIST_ADD(sockets, child_si); + + if (addr != NULL) { + swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0); + swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0); + swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0); + } + + return fd; +} + +#ifdef HAVE_ACCEPT4 +int accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags) +{ + return swrap_accept(s, addr, (socklen_t *)addrlen, flags); +} +#endif + +#ifdef HAVE_ACCEPT_PSOCKLEN_T +int accept(int s, struct sockaddr *addr, Psocklen_t addrlen) +#else +int accept(int s, struct sockaddr *addr, socklen_t *addrlen) +#endif +{ + return swrap_accept(s, addr, (socklen_t *)addrlen, 0); +} + +static int autobind_start_init; +static int autobind_start; + +/* using sendto() or connect() on an unbound socket would give the + recipient no way to reply, as unlike UDP and TCP, a unix domain + socket can't auto-assign ephemeral port numbers, so we need to + assign it here. + Note: this might change the family from ipv6 to ipv4 +*/ +static int swrap_auto_bind(int fd, struct socket_info *si, int family) +{ + struct swrap_address un_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + int i; + char type; + int ret; + int port; + unsigned int in4_addr, in6_a0, in6_a1, in6_a2, in6_a3; + 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_LONG; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP_LONG; + break; + default: + errno = ESOCKTNOSUPPORT; + return -1; + } + + memset(&in, 0, sizeof(in)); + in.sin_family = AF_INET; + in4_addr = socket_wrapper_default_addr(); + in.sin_addr.s_addr = htonl(in4_addr); + + 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_LONG; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP_V6_LONG; + 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); + swrap_make_ipv6_ints(in6.sin6_addr.s6_addr,&in6_a0,&in6_a1,&in6_a2,&in6_a3); + 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; + + if (family == AF_INET) + snprintf(un_addr.sa.un.sun_path, sizeof(un_addr.sa.un.sun_path), + "%s/"SOCKET_FORMAT_LONG, socket_wrapper_dir(), + type, in4_addr, port); + else + snprintf(un_addr.sa.un.sun_path, sizeof(un_addr.sa.un.sun_path), + "%s/"SOCKET_FORMAT_V6_LONG, socket_wrapper_dir(), + type, in6_a0,in6_a1, in6_a2, in6_a3, 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; + SWRAP_LOG(SWRAP_LOG_TRACE, "bound to: %s", un_addr.sa.un.sun_path); + 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_addr(), + 0); + errno = ENFILE; + return -1; + } + + si->family = family; + set_port(si->family, port, &si->myname); + + return 0; +} + +/**************************************************************************** + * CONNECT + ***************************************************************************/ + +static int swrap_connect(int s, const struct sockaddr *serv_addr, + socklen_t addrlen) +{ + int ret; + struct swrap_address un_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + struct socket_info *si = find_socket_info(s); + int bcast = 0; + + if (!si) { + return libc_connect(s, serv_addr, addrlen); + } + + if (si->bound == 0) { + ret = swrap_auto_bind(s, si, serv_addr->sa_family); + if (ret == -1) return -1; + } + + if (si->family != serv_addr->sa_family) { + errno = EINVAL; + return -1; + } + + ret = sockaddr_convert_to_un(si, serv_addr, + addrlen, &un_addr.sa.un, 0, &bcast); + if (ret == -1) return -1; + + if (bcast) { + errno = ENETUNREACH; + return -1; + } + + if (si->type == SOCK_DGRAM) { + si->defer_connect = 1; + ret = 0; + } else { + swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0); + + ret = libc_connect(s, + &un_addr.sa.s, + un_addr.sa_socklen); + } + + SWRAP_LOG(SWRAP_LOG_TRACE, + "connect() path=%s, fd=%d", + un_addr.sa.un.sun_path, s); + + + /* to give better errors */ + if (ret == -1 && errno == ENOENT) { + errno = EHOSTUNREACH; + } + + if (ret == 0) { + si->peername = (struct swrap_address) { + .sa_socklen = addrlen, + }; + + memcpy(&si->peername.sa.ss, serv_addr, addrlen); + si->connected = 1; + + /* + * When we connect() on a socket than we have to bind the + * outgoing connection on the interface we use for the + * transport. We already bound it on the right interface + * but here we have to update the name so getsockname() + * returns correct information. + */ + if (si->bindname.sa_socklen > 0) { + si->myname = (struct swrap_address) { + .sa_socklen = si->bindname.sa_socklen, + }; + + memcpy(&si->myname.sa.ss, + &si->bindname.sa.ss, + si->bindname.sa_socklen); + + /* Cleanup bindname */ + si->bindname = (struct swrap_address) { + .sa_socklen = 0, + }; + } + + swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0); + swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0); + } else { + swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0); + } + + return ret; +} + +int connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen) +{ + return swrap_connect(s, serv_addr, addrlen); +} + +/**************************************************************************** + * BIND + ***************************************************************************/ + +static int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen) +{ + int ret; + struct swrap_address un_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + struct socket_info *si = find_socket_info(s); + int bind_error = 0; +#if 0 /* FIXME */ + bool in_use; +#endif + + if (!si) { + return libc_bind(s, myaddr, addrlen); + } + + switch (si->family) { + case AF_INET: { + const struct sockaddr_in *sin; + if (addrlen < sizeof(struct sockaddr_in)) { + bind_error = EINVAL; + break; + } + + sin = (const struct sockaddr_in *)(const void *)myaddr; + + if (sin->sin_family != AF_INET) { + bind_error = EAFNOSUPPORT; + } + + /* special case for AF_UNSPEC */ + if (sin->sin_family == AF_UNSPEC && + (sin->sin_addr.s_addr == htonl(INADDR_ANY))) + { + bind_error = 0; + } + + break; + } +#ifdef HAVE_IPV6 + case AF_INET6: { + const struct sockaddr_in6 *sin6; + if (addrlen < sizeof(struct sockaddr_in6)) { + bind_error = EINVAL; + break; + } + + sin6 = (const struct sockaddr_in6 *)(const void *)myaddr; + + if (sin6->sin6_family != AF_INET6) { + bind_error = EAFNOSUPPORT; + } + + break; + } +#endif + default: + bind_error = EINVAL; + break; + } + + if (bind_error != 0) { + errno = bind_error; + return -1; + } + +#if 0 /* FIXME */ + in_use = check_addr_port_in_use(myaddr, addrlen); + if (in_use) { + errno = EADDRINUSE; + return -1; + } +#endif + + si->myname.sa_socklen = addrlen; + memcpy(&si->myname.sa.ss, myaddr, addrlen); + + ret = sockaddr_convert_to_un(si, + myaddr, + addrlen, + &un_addr.sa.un, + 1, + &si->bcast); + if (ret == -1) return -1; + + unlink(un_addr.sa.un.sun_path); + + ret = libc_bind(s, &un_addr.sa.s, un_addr.sa_socklen); + + SWRAP_LOG(SWRAP_LOG_TRACE, + "bind() path=%s, fd=%d", + un_addr.sa.un.sun_path, s); + + if (ret == 0) { + si->bound = 1; + } + + return ret; +} + +int bind(int s, const struct sockaddr *myaddr, socklen_t addrlen) +{ + return swrap_bind(s, myaddr, addrlen); +} + +/**************************************************************************** + * BINDRESVPORT + ***************************************************************************/ + +#ifdef HAVE_BINDRESVPORT +static int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen); + +static int swrap_bindresvport_sa(int sd, struct sockaddr *sa) +{ + struct swrap_address myaddr = { + .sa_socklen = sizeof(struct sockaddr_storage), + }; + socklen_t salen; + static uint16_t port; + uint16_t i; + int rc = -1; + int af; + +#define SWRAP_STARTPORT 600 +#define SWRAP_ENDPORT (IPPORT_RESERVED - 1) +#define SWRAP_NPORTS (SWRAP_ENDPORT - SWRAP_STARTPORT + 1) + + if (port == 0) { + port = (getpid() % SWRAP_NPORTS) + SWRAP_STARTPORT; + } + + if (sa == NULL) { + salen = myaddr.sa_socklen; + sa = &myaddr.sa.s; + + rc = swrap_getsockname(sd, &myaddr.sa.s, &salen); + if (rc < 0) { + return -1; + } + + af = sa->sa_family; + memset(&myaddr.sa.ss, 0, salen); + } else { + af = sa->sa_family; + } + + for (i = 0; i < SWRAP_NPORTS; i++, port++) { + switch(af) { + case AF_INET: { + struct sockaddr_in *sinp = (struct sockaddr_in *)(void *)sa; + + salen = sizeof(struct sockaddr_in); + sinp->sin_port = htons(port); + break; + } + case AF_INET6: { + struct sockaddr_in6 *sin6p = (struct sockaddr_in6 *)(void *)sa; + + salen = sizeof(struct sockaddr_in6); + sin6p->sin6_port = htons(port); + break; + } + default: + errno = EAFNOSUPPORT; + return -1; + } + sa->sa_family = af; + + if (port > SWRAP_ENDPORT) { + port = SWRAP_STARTPORT; + } + + rc = swrap_bind(sd, (struct sockaddr *)sa, salen); + if (rc == 0 || errno != EADDRINUSE) { + break; + } + } + + return rc; +} + +int bindresvport(int sockfd, struct sockaddr_in *sinp) +{ + return swrap_bindresvport_sa(sockfd, (struct sockaddr *)sinp); +} +#endif + +/**************************************************************************** + * LISTEN + ***************************************************************************/ + +static int swrap_listen(int s, int backlog) +{ + int ret; + struct socket_info *si = find_socket_info(s); + + if (!si) { + return libc_listen(s, backlog); + } + + if (si->bound == 0) { + ret = swrap_auto_bind(s, si, si->family); + if (ret == -1) { + errno = EADDRINUSE; + return ret; + } + } + + ret = libc_listen(s, backlog); + + return ret; +} + +int listen(int s, int backlog) +{ + return swrap_listen(s, backlog); +} + +/**************************************************************************** + * FOPEN + ***************************************************************************/ + +static FILE *swrap_fopen(const char *name, const char *mode) +{ + FILE *fp; + + fp = libc_fopen(name, mode); + if (fp != NULL) { + int fd = fileno(fp); + + swrap_remove_stale(fd); + } + + return fp; +} + +FILE *fopen(const char *name, const char *mode) +{ + return swrap_fopen(name, mode); +} + +/**************************************************************************** + * OPEN + ***************************************************************************/ + +static int swrap_vopen(const char *pathname, int flags, va_list ap) +{ + int ret; + + ret = libc_vopen(pathname, flags, ap); + if (ret != -1) { + /* + * There are methods for closing descriptors (libc-internal code + * paths, direct syscalls) which close descriptors in ways that + * we can't intercept, so try to recover when we notice that + * that's happened + */ + swrap_remove_stale(ret); + } + return ret; +} + +int open(const char *pathname, int flags, ...) +{ + va_list ap; + int fd; + + va_start(ap, flags); + fd = swrap_vopen(pathname, flags, ap); + va_end(ap); + + return fd; +} + +/**************************************************************************** + * GETPEERNAME + ***************************************************************************/ + +static int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen) +{ + struct socket_info *si = find_socket_info(s); + socklen_t len; + + if (!si) { + return libc_getpeername(s, name, addrlen); + } + + if (si->peername.sa_socklen == 0) + { + errno = ENOTCONN; + return -1; + } + + len = MIN(*addrlen, si->peername.sa_socklen); + if (len == 0) { + return 0; + } + + memcpy(name, &si->peername.sa.ss, len); + *addrlen = si->peername.sa_socklen; + + return 0; +} + +#ifdef HAVE_ACCEPT_PSOCKLEN_T +int getpeername(int s, struct sockaddr *name, Psocklen_t addrlen) +#else +int getpeername(int s, struct sockaddr *name, socklen_t *addrlen) +#endif +{ + return swrap_getpeername(s, name, (socklen_t *)addrlen); +} + +/**************************************************************************** + * GETSOCKNAME + ***************************************************************************/ + +static int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen) +{ + struct socket_info *si = find_socket_info(s); + socklen_t len; + + if (!si) { + return libc_getsockname(s, name, addrlen); + } + + len = MIN(*addrlen, si->myname.sa_socklen); + if (len == 0) { + return 0; + } + + memcpy(name, &si->myname.sa.ss, len); + *addrlen = si->myname.sa_socklen; + + return 0; +} + +#ifdef HAVE_ACCEPT_PSOCKLEN_T +int getsockname(int s, struct sockaddr *name, Psocklen_t addrlen) +#else +int getsockname(int s, struct sockaddr *name, socklen_t *addrlen) +#endif +{ + return swrap_getsockname(s, name, (socklen_t *)addrlen); +} + +/**************************************************************************** + * GETSOCKOPT + ***************************************************************************/ + +#ifndef SO_PROTOCOL +# ifdef SO_PROTOTYPE /* The Solaris name */ +# define SO_PROTOCOL SO_PROTOTYPE +# endif /* SO_PROTOTYPE */ +#endif /* SO_PROTOCOL */ + +static int swrap_getsockopt(int s, int level, int optname, + void *optval, socklen_t *optlen) +{ + struct socket_info *si = find_socket_info(s); + + if (!si) { + return libc_getsockopt(s, + level, + optname, + optval, + optlen); + } + + if (level == SOL_SOCKET) { + switch (optname) { +#ifdef SO_DOMAIN + case SO_DOMAIN: + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + return -1; + } + + *optlen = sizeof(int); + *(int *)optval = si->family; + return 0; +#endif /* SO_DOMAIN */ + +#ifdef SO_PROTOCOL + case SO_PROTOCOL: + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + return -1; + } + + *optlen = sizeof(int); + *(int *)optval = si->protocol; + return 0; +#endif /* SO_PROTOCOL */ + case SO_TYPE: + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + return -1; + } + + *optlen = sizeof(int); + *(int *)optval = si->type; + return 0; + default: + return libc_getsockopt(s, + level, + optname, + optval, + optlen); + } + } else if (level == IPPROTO_TCP) { + switch (optname) { +#ifdef TCP_NODELAY + case TCP_NODELAY: + /* + * This enables sending packets directly out over TCP. + * As a unix socket is doing that any way, report it as + * enabled. + */ + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + return -1; + } + + *optlen = sizeof(int); + *(int *)optval = si->tcp_nodelay; + + return 0; +#endif /* TCP_NODELAY */ + default: + break; + } + } + + errno = ENOPROTOOPT; + return -1; +} + +#ifdef HAVE_ACCEPT_PSOCKLEN_T +int getsockopt(int s, int level, int optname, void *optval, Psocklen_t optlen) +#else +int getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen) +#endif +{ + return swrap_getsockopt(s, level, optname, optval, (socklen_t *)optlen); +} + +/**************************************************************************** + * SETSOCKOPT + ***************************************************************************/ + +static int swrap_setsockopt(int s, int level, int optname, + const void *optval, socklen_t optlen) +{ + struct socket_info *si = find_socket_info(s); + + if (!si) { + return libc_setsockopt(s, + level, + optname, + optval, + optlen); + } + + if (level == SOL_SOCKET) { + return libc_setsockopt(s, + level, + optname, + optval, + optlen); + } else if (level == IPPROTO_TCP) { + switch (optname) { +#ifdef TCP_NODELAY + case TCP_NODELAY: { + int i; + + /* + * This enables sending packets directly out over TCP. + * A unix socket is doing that any way. + */ + if (optval == NULL || optlen == 0 || + optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + return -1; + } + + i = *discard_const_p(int, optval); + if (i != 0 && i != 1) { + errno = EINVAL; + return -1; + } + si->tcp_nodelay = i; + + return 0; + } +#endif /* TCP_NODELAY */ + default: + break; + } + } + + switch (si->family) { + case AF_INET: + if (level == IPPROTO_IP) { +#ifdef IP_PKTINFO + if (optname == IP_PKTINFO) { + si->pktinfo = AF_INET; + } +#endif /* IP_PKTINFO */ + } + return 0; +#ifdef HAVE_IPV6 + case AF_INET6: + if (level == IPPROTO_IPV6) { +#ifdef IPV6_RECVPKTINFO + if (optname == IPV6_RECVPKTINFO) { + si->pktinfo = AF_INET6; + } +#endif /* IPV6_PKTINFO */ + } + return 0; +#endif + default: + errno = ENOPROTOOPT; + return -1; + } +} + +int setsockopt(int s, int level, int optname, + const void *optval, socklen_t optlen) +{ + return swrap_setsockopt(s, level, optname, optval, optlen); +} + +/**************************************************************************** + * IOCTL + ***************************************************************************/ + +static int swrap_vioctl(int s, unsigned long int r, va_list va) +{ + struct socket_info *si = find_socket_info(s); + va_list ap; + int value; + int rc; + + if (!si) { + return libc_vioctl(s, r, va); + } + + va_copy(ap, va); + + rc = libc_vioctl(s, r, va); + + switch (r) { + case FIONREAD: + value = *((int *)va_arg(ap, int *)); + + if (rc == -1 && errno != EAGAIN && errno != ENOBUFS) { + swrap_pcap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0); + } else if (value == 0) { /* END OF FILE */ + swrap_pcap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0); + } + break; + } + + va_end(ap); + + return rc; +} + +#ifdef HAVE_IOCTL_INT +int ioctl(int s, int r, ...) +#else +int ioctl(int s, unsigned long int r, ...) +#endif +{ + va_list va; + int rc; + + va_start(va, r); + + rc = swrap_vioctl(s, (unsigned long int) r, va); + + va_end(va); + + return rc; +} + +/***************** + * CMSG + *****************/ + +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + +#ifndef CMSG_ALIGN +# ifdef _ALIGN /* BSD */ +#define CMSG_ALIGN _ALIGN +# else +#define CMSG_ALIGN(len) (((len) + sizeof(size_t) - 1) & ~(sizeof(size_t) - 1)) +# endif /* _ALIGN */ +#endif /* CMSG_ALIGN */ + +/** + * @brief Add a cmsghdr to a msghdr. + * + * This is an function to add any type of cmsghdr. It will operate on the + * msg->msg_control and msg->msg_controllen you pass in by adapting them to + * the buffer position after the added cmsg element. Hence, this function is + * intended to be used with an intermediate msghdr and not on the original + * one handed in by the client. + * + * @param[in] msg The msghdr to which to add the cmsg. + * + * @param[in] level The cmsg level to set. + * + * @param[in] type The cmsg type to set. + * + * @param[in] data The cmsg data to set. + * + * @param[in] len the length of the data to set. + */ +static void swrap_msghdr_add_cmsghdr(struct msghdr *msg, + int level, + int type, + const void *data, + size_t len) +{ + size_t cmlen = CMSG_LEN(len); + size_t cmspace = CMSG_SPACE(len); + uint8_t cmbuf[cmspace]; + void *cast_ptr = (void *)cmbuf; + struct cmsghdr *cm = (struct cmsghdr *)cast_ptr; + uint8_t *p; + + memset(cmbuf, 0, cmspace); + + if (msg->msg_controllen < cmlen) { + cmlen = msg->msg_controllen; + msg->msg_flags |= MSG_CTRUNC; + } + + if (msg->msg_controllen < cmspace) { + cmspace = msg->msg_controllen; + } + + /* + * We copy the full input data into an intermediate cmsghdr first + * in order to more easily cope with truncation. + */ + cm->cmsg_len = cmlen; + cm->cmsg_level = level; + cm->cmsg_type = type; + memcpy(CMSG_DATA(cm), data, len); + + /* + * We now copy the possibly truncated buffer. + * We copy cmlen bytes, but consume cmspace bytes, + * leaving the possible padding uninitialiazed. + */ + p = (uint8_t *)msg->msg_control; + memcpy(p, cm, cmlen); + p += cmspace; + msg->msg_control = p; + msg->msg_controllen -= cmspace; + + return; +} + +static int swrap_msghdr_add_pktinfo(struct socket_info *si, + struct msghdr *msg) +{ + /* Add packet info */ + switch (si->pktinfo) { +#if defined(IP_PKTINFO) && (defined(HAVE_STRUCT_IN_PKTINFO) || defined(IP_RECVDSTADDR)) + case AF_INET: { + struct sockaddr_in *sin; +#if defined(HAVE_STRUCT_IN_PKTINFO) + struct in_pktinfo pkt; +#elif defined(IP_RECVDSTADDR) + struct in_addr pkt; +#endif + + if (si->bindname.sa_socklen == sizeof(struct sockaddr_in)) { + sin = &si->bindname.sa.in; + } else { + if (si->myname.sa_socklen != sizeof(struct sockaddr_in)) { + return 0; + } + sin = &si->myname.sa.in; + } + + ZERO_STRUCT(pkt); + +#if defined(HAVE_STRUCT_IN_PKTINFO) + pkt.ipi_ifindex = socket_wrapper_default_iface(); + pkt.ipi_addr.s_addr = sin->sin_addr.s_addr; +#elif defined(IP_RECVDSTADDR) + pkt = sin->sin_addr; +#endif + + swrap_msghdr_add_cmsghdr(msg, IPPROTO_IP, IP_PKTINFO, + &pkt, sizeof(pkt)); + + break; + } +#endif /* IP_PKTINFO */ +#if defined(HAVE_IPV6) + case AF_INET6: { +#if defined(IPV6_PKTINFO) && defined(HAVE_STRUCT_IN6_PKTINFO) + struct sockaddr_in6 *sin6; + struct in6_pktinfo pkt6; + + if (si->bindname.sa_socklen == sizeof(struct sockaddr_in6)) { + sin6 = &si->bindname.sa.in6; + } else { + if (si->myname.sa_socklen != sizeof(struct sockaddr_in6)) { + return 0; + } + sin6 = &si->myname.sa.in6; + } + + ZERO_STRUCT(pkt6); + + pkt6.ipi6_ifindex = socket_wrapper_default_iface(); + pkt6.ipi6_addr = sin6->sin6_addr; + + swrap_msghdr_add_cmsghdr(msg, IPPROTO_IPV6, IPV6_PKTINFO, + &pkt6, sizeof(pkt6)); +#endif /* HAVE_STRUCT_IN6_PKTINFO */ + + break; + } +#endif /* IPV6_PKTINFO */ + default: + return -1; + } + + return 0; +} + +static int swrap_msghdr_add_socket_info(struct socket_info *si, + struct msghdr *omsg) +{ + int rc = 0; + + if (si->pktinfo > 0) { + rc = swrap_msghdr_add_pktinfo(si, omsg); + } + + return rc; +} + +static int swrap_sendmsg_copy_cmsg(struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space); +static int swrap_sendmsg_filter_cmsg_socket(struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space); + +static int swrap_sendmsg_filter_cmsghdr(struct msghdr *msg, + uint8_t **cm_data, + size_t *cm_data_space) { + struct cmsghdr *cmsg; + int rc = -1; + + /* Nothing to do */ + if (msg->msg_controllen == 0 || msg->msg_control == NULL) { + return 0; + } + + for (cmsg = CMSG_FIRSTHDR(msg); + cmsg != NULL; + cmsg = CMSG_NXTHDR(msg, cmsg)) { + switch (cmsg->cmsg_level) { + case IPPROTO_IP: + rc = swrap_sendmsg_filter_cmsg_socket(cmsg, + cm_data, + cm_data_space); + break; + default: + rc = swrap_sendmsg_copy_cmsg(cmsg, + cm_data, + cm_data_space); + break; + } + } + + return rc; +} + +static int swrap_sendmsg_copy_cmsg(struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space) +{ + size_t cmspace; + uint8_t *p; + + cmspace = *cm_data_space + CMSG_ALIGN(cmsg->cmsg_len); + + p = realloc((*cm_data), cmspace); + if (p == NULL) { + return -1; + } + (*cm_data) = p; + + p = (*cm_data) + (*cm_data_space); + *cm_data_space = cmspace; + + memcpy(p, cmsg, cmsg->cmsg_len); + + return 0; +} + +static int swrap_sendmsg_filter_cmsg_pktinfo(struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space); + + +static int swrap_sendmsg_filter_cmsg_socket(struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space) +{ + int rc = -1; + + switch(cmsg->cmsg_type) { +#ifdef IP_PKTINFO + case IP_PKTINFO: + rc = swrap_sendmsg_filter_cmsg_pktinfo(cmsg, + cm_data, + cm_data_space); + break; +#endif +#ifdef IPV6_PKTINFO + case IPV6_PKTINFO: + rc = swrap_sendmsg_filter_cmsg_pktinfo(cmsg, + cm_data, + cm_data_space); + break; +#endif + default: + break; + } + + return rc; +} + +static int swrap_sendmsg_filter_cmsg_pktinfo(struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space) +{ + (void)cmsg; /* unused */ + (void)cm_data; /* unused */ + (void)cm_data_space; /* unused */ + + /* + * Passing a IP pktinfo to a unix socket might be rejected by the + * Kernel, at least on FreeBSD. So skip this cmsg. + */ + return 0; +} +#endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ + +static ssize_t swrap_sendmsg_before(int fd, + struct socket_info *si, + struct msghdr *msg, + struct iovec *tmp_iov, + struct sockaddr_un *tmp_un, + const struct sockaddr_un **to_un, + const struct sockaddr **to, + int *bcast) +{ + size_t i, len = 0; + ssize_t ret; + + if (to_un) { + *to_un = NULL; + } + if (to) { + *to = NULL; + } + if (bcast) { + *bcast = 0; + } + + switch (si->type) { + case SOCK_STREAM: { + unsigned long mtu; + + if (!si->connected) { + errno = ENOTCONN; + return -1; + } + + if (msg->msg_iovlen == 0) { + break; + } + + mtu = socket_wrapper_mtu(); + for (i = 0; i < (size_t)msg->msg_iovlen; i++) { + size_t nlen; + nlen = len + msg->msg_iov[i].iov_len; + if (nlen > mtu) { + break; + } + } + msg->msg_iovlen = i; + if (msg->msg_iovlen == 0) { + *tmp_iov = msg->msg_iov[0]; + tmp_iov->iov_len = MIN((size_t)tmp_iov->iov_len, + (size_t)mtu); + msg->msg_iov = tmp_iov; + msg->msg_iovlen = 1; + } + break; + } + case SOCK_DGRAM: + if (si->connected) { + if (msg->msg_name != NULL) { + /* + * We are dealing with unix sockets and if we + * are connected, we should only talk to the + * connected unix path. Using the fd to send + * to another server would be hard to achieve. + */ + msg->msg_name = NULL; + msg->msg_namelen = 0; + } + } else { + const struct sockaddr *msg_name; + msg_name = (const struct sockaddr *)msg->msg_name; + + if (msg_name == NULL) { + errno = ENOTCONN; + return -1; + } + + + ret = sockaddr_convert_to_un(si, msg_name, msg->msg_namelen, + tmp_un, 0, bcast); + if (ret == -1) return -1; + + if (to_un) { + *to_un = tmp_un; + } + if (to) { + *to = msg_name; + } + msg->msg_name = tmp_un; + msg->msg_namelen = sizeof(*tmp_un); + } + + if (si->bound == 0) { + ret = swrap_auto_bind(fd, si, si->family); + if (ret == -1) { + if (errno == ENOTSOCK) { + swrap_remove_stale(fd); + return -ENOTSOCK; + } else { + SWRAP_LOG(SWRAP_LOG_ERROR, "swrap_sendmsg_before failed"); + return -1; + } + } + } + + if (!si->defer_connect) { + break; + } + + ret = sockaddr_convert_to_un(si, + &si->peername.sa.s, + si->peername.sa_socklen, + tmp_un, + 0, + NULL); + if (ret == -1) return -1; + + ret = libc_connect(fd, + (struct sockaddr *)(void *)tmp_un, + sizeof(*tmp_un)); + + /* to give better errors */ + if (ret == -1 && errno == ENOENT) { + errno = EHOSTUNREACH; + } + + if (ret == -1) { + return ret; + } + + si->defer_connect = 0; + break; + default: + errno = EHOSTUNREACH; + return -1; + } + +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + if (msg->msg_controllen > 0 && msg->msg_control != NULL) { + uint8_t *cmbuf = NULL; + size_t cmlen = 0; + + ret = swrap_sendmsg_filter_cmsghdr(msg, &cmbuf, &cmlen); + if (ret < 0) { + free(cmbuf); + return -1; + } + + if (cmlen == 0) { + msg->msg_controllen = 0; + msg->msg_control = NULL; + } else if (cmlen < msg->msg_controllen && cmbuf != NULL) { + memcpy(msg->msg_control, cmbuf, cmlen); + msg->msg_controllen = cmlen; + } + free(cmbuf); + } +#endif + + return 0; +} + +static void swrap_sendmsg_after(int fd, + struct socket_info *si, + struct msghdr *msg, + const struct sockaddr *to, + ssize_t ret) +{ + int saved_errno = errno; + size_t i, len = 0; + uint8_t *buf; + off_t ofs = 0; + size_t avail = 0; + size_t remain; + + /* to give better errors */ + if (ret == -1) { + if (saved_errno == ENOENT) { + saved_errno = EHOSTUNREACH; + } else if (saved_errno == ENOTSOCK) { + /* If the fd is not a socket, remove it */ + swrap_remove_stale(fd); + } + } + + for (i = 0; i < (size_t)msg->msg_iovlen; i++) { + avail += msg->msg_iov[i].iov_len; + } + + if (ret == -1) { + remain = MIN(80, avail); + } else { + remain = ret; + } + + /* we capture it as one single packet */ + buf = (uint8_t *)malloc(remain); + if (!buf) { + /* we just not capture the packet */ + errno = saved_errno; + return; + } + + for (i = 0; i < (size_t)msg->msg_iovlen; i++) { + size_t this_time = MIN(remain, (size_t)msg->msg_iov[i].iov_len); + memcpy(buf + ofs, + msg->msg_iov[i].iov_base, + this_time); + ofs += this_time; + remain -= this_time; + } + len = ofs; + + switch (si->type) { + case SOCK_STREAM: + if (ret == -1) { + swrap_pcap_dump_packet(si, NULL, SWRAP_SEND, buf, len); + swrap_pcap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0); + } else { + swrap_pcap_dump_packet(si, NULL, SWRAP_SEND, buf, len); + } + break; + + case SOCK_DGRAM: + if (si->connected) { + to = &si->peername.sa.s; + } + if (ret == -1) { + swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len); + swrap_pcap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len); + } else { + swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len); + } + break; + } + + free(buf); + errno = saved_errno; +} + +static int swrap_recvmsg_before(int fd, + struct socket_info *si, + struct msghdr *msg, + struct iovec *tmp_iov) +{ + size_t i, len = 0; + ssize_t ret; + + (void)fd; /* unused */ + + switch (si->type) { + case SOCK_STREAM: { + unsigned int mtu; + if (!si->connected) { + errno = ENOTCONN; + return -1; + } + + if (msg->msg_iovlen == 0) { + break; + } + + mtu = socket_wrapper_mtu(); + for (i = 0; i < (size_t)msg->msg_iovlen; i++) { + size_t nlen; + nlen = len + msg->msg_iov[i].iov_len; + if (nlen > mtu) { + break; + } + } + msg->msg_iovlen = i; + if (msg->msg_iovlen == 0) { + *tmp_iov = msg->msg_iov[0]; + tmp_iov->iov_len = MIN((size_t)tmp_iov->iov_len, + (size_t)mtu); + msg->msg_iov = tmp_iov; + msg->msg_iovlen = 1; + } + break; + } + case SOCK_DGRAM: + if (msg->msg_name == NULL) { + errno = EINVAL; + return -1; + } + + if (msg->msg_iovlen == 0) { + break; + } + + if (si->bound == 0) { + ret = swrap_auto_bind(fd, si, si->family); + if (ret == -1) { + /* + * When attempting to read or write to a + * descriptor, if an underlying autobind fails + * because it's not a socket, stop intercepting + * uses of that descriptor. + */ + if (errno == ENOTSOCK) { + swrap_remove_stale(fd); + return -ENOTSOCK; + } else { + SWRAP_LOG(SWRAP_LOG_ERROR, + "swrap_recvmsg_before failed"); + return -1; + } + } + } + break; + default: + errno = EHOSTUNREACH; + return -1; + } + + return 0; +} + +static int swrap_recvmsg_after(int fd, + struct socket_info *si, + struct msghdr *msg, + const struct sockaddr_un *un_addr, + socklen_t un_addrlen, + ssize_t ret) +{ + int saved_errno = errno; + size_t i; + uint8_t *buf = NULL; + off_t ofs = 0; + size_t avail = 0; + size_t remain; + int rc; + + /* to give better errors */ + if (ret == -1) { + if (saved_errno == ENOENT) { + saved_errno = EHOSTUNREACH; + } else if (saved_errno == ENOTSOCK) { + /* If the fd is not a socket, remove it */ + swrap_remove_stale(fd); + } + } + + for (i = 0; i < (size_t)msg->msg_iovlen; i++) { + avail += msg->msg_iov[i].iov_len; + } + + /* Convert the socket address before we leave */ + if (si->type == SOCK_DGRAM && un_addr != NULL) { + rc = sockaddr_convert_from_un(si, + un_addr, + un_addrlen, + si->family, + msg->msg_name, + &msg->msg_namelen); + if (rc == -1) { + goto done; + } + } + + if (avail == 0) { + rc = 0; + goto done; + } + + if (ret == -1) { + remain = MIN(80, avail); + } else { + remain = ret; + } + + /* we capture it as one single packet */ + buf = (uint8_t *)malloc(remain); + if (buf == NULL) { + /* we just not capture the packet */ + errno = saved_errno; + return -1; + } + + for (i = 0; i < (size_t)msg->msg_iovlen; i++) { + size_t this_time = MIN(remain, (size_t)msg->msg_iov[i].iov_len); + memcpy(buf + ofs, + msg->msg_iov[i].iov_base, + this_time); + ofs += this_time; + remain -= this_time; + } + + switch (si->type) { + case SOCK_STREAM: + if (ret == -1 && saved_errno != EAGAIN && saved_errno != ENOBUFS) { + swrap_pcap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0); + } else if (ret == 0) { /* END OF FILE */ + swrap_pcap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0); + } else if (ret > 0) { + swrap_pcap_dump_packet(si, NULL, SWRAP_RECV, buf, ret); + } + break; + + case SOCK_DGRAM: + if (ret == -1) { + break; + } + + if (un_addr != NULL) { + swrap_pcap_dump_packet(si, + msg->msg_name, + SWRAP_RECVFROM, + buf, + ret); + } else { + swrap_pcap_dump_packet(si, + msg->msg_name, + SWRAP_RECV, + buf, + ret); + } + + break; + } + + rc = 0; +done: + free(buf); + errno = saved_errno; + +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + if (rc == 0 && + msg->msg_controllen > 0 && + msg->msg_control != NULL) { + rc = swrap_msghdr_add_socket_info(si, msg); + if (rc < 0) { + return -1; + } + } +#endif + + return rc; +} + +/**************************************************************************** + * RECVFROM + ***************************************************************************/ + +static ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, + struct sockaddr *from, socklen_t *fromlen) +{ + struct swrap_address from_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + ssize_t ret; + struct socket_info *si = find_socket_info(s); + struct swrap_address saddr = { + .sa_socklen = sizeof(struct sockaddr_storage), + }; + struct msghdr msg; + struct iovec tmp; + int tret; + + if (!si) { + return libc_recvfrom(s, + buf, + len, + flags, + from, + fromlen); + } + + tmp.iov_base = buf; + tmp.iov_len = len; + + ZERO_STRUCT(msg); + if (from != NULL && fromlen != NULL) { + msg.msg_name = from; /* optional address */ + msg.msg_namelen = *fromlen; /* size of address */ + } else { + msg.msg_name = &saddr.sa.s; /* optional address */ + msg.msg_namelen = saddr.sa_socklen; /* size of address */ + } + msg.msg_iov = &tmp; /* scatter/gather array */ + msg.msg_iovlen = 1; /* # elements in msg_iov */ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + tret = swrap_recvmsg_before(s, si, &msg, &tmp); + if (tret < 0) { + return -1; + } + + buf = msg.msg_iov[0].iov_base; + len = msg.msg_iov[0].iov_len; + + ret = libc_recvfrom(s, + buf, + len, + flags, + &from_addr.sa.s, + &from_addr.sa_socklen); + if (ret == -1) { + return ret; + } + + tret = swrap_recvmsg_after(s, + si, + &msg, + &from_addr.sa.un, + from_addr.sa_socklen, + ret); + if (tret != 0) { + return tret; + } + + if (from != NULL && fromlen != NULL) { + *fromlen = msg.msg_namelen; + } + + return ret; +} + +#ifdef HAVE_ACCEPT_PSOCKLEN_T +ssize_t recvfrom(int s, void *buf, size_t len, int flags, + struct sockaddr *from, Psocklen_t fromlen) +#else +ssize_t recvfrom(int s, void *buf, size_t len, int flags, + struct sockaddr *from, socklen_t *fromlen) +#endif +{ + return swrap_recvfrom(s, buf, len, flags, from, (socklen_t *)fromlen); +} + +/**************************************************************************** + * SENDTO + ***************************************************************************/ + +static ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, + const struct sockaddr *to, socklen_t tolen) +{ + struct msghdr msg; + struct iovec tmp; + struct swrap_address un_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + const struct sockaddr_un *to_un = NULL; + ssize_t ret; + int rc; + struct socket_info *si = find_socket_info(s); + int bcast = 0; + + if (!si) { + return libc_sendto(s, buf, len, flags, to, tolen); + } + + tmp.iov_base = discard_const_p(char, buf); + tmp.iov_len = len; + + ZERO_STRUCT(msg); + msg.msg_name = discard_const_p(struct sockaddr, to); /* optional address */ + msg.msg_namelen = tolen; /* size of address */ + msg.msg_iov = &tmp; /* scatter/gather array */ + msg.msg_iovlen = 1; /* # elements in msg_iov */ +#if HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + rc = swrap_sendmsg_before(s, + si, + &msg, + &tmp, + &un_addr.sa.un, + &to_un, + &to, + &bcast); + if (rc < 0) { + return -1; + } + + buf = msg.msg_iov[0].iov_base; + len = msg.msg_iov[0].iov_len; + + if (bcast) { +/* struct stat st; + unsigned int iface; */ + unsigned int prt = ntohs(((const struct sockaddr_in *)(const void *)to)->sin_port); + unsigned int remote_prt; + unsigned int in4_addr; + char type; + DIR *d; + struct dirent *dir; + +/* + 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); + } +*/ + + d = opendir(socket_wrapper_dir()); + if (d) { + while ((dir = readdir(d)) != NULL) { + if (dir->d_name[0] == SOCKET_TYPE_CHAR_UDP_LONG) + /* TODO - use S_ISSOCK ? */ + if (sscanf(dir->d_name, SOCKET_FORMAT_LONG, &type, &in4_addr, &remote_prt) == 3) + if (prt == remote_prt) { + snprintf(un_addr.sa.un.sun_path, + sizeof(un_addr.sa.un.sun_path), + "%s/%s", + socket_wrapper_dir(),dir->d_name); + libc_sendto(s, + buf, + len, + flags, + &un_addr.sa.s, + un_addr.sa_socklen); + SWRAP_LOG(SWRAP_LOG_DEBUG,"send bcast packet to %s", dir->d_name); + } + } + closedir(d); + } + + swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len); + + return len; + } + + /* + * If it is a dgram socket and we are connected, don't include the + * 'to' address. + */ + if (si->type == SOCK_DGRAM && si->connected) { + ret = libc_sendto(s, + buf, + len, + flags, + NULL, + 0); + } else { + ret = libc_sendto(s, + buf, + len, + flags, + (struct sockaddr *)msg.msg_name, + msg.msg_namelen); + } + + swrap_sendmsg_after(s, si, &msg, to, ret); + + return ret; +} + +ssize_t sendto(int s, const void *buf, size_t len, int flags, + const struct sockaddr *to, socklen_t tolen) +{ + return swrap_sendto(s, buf, len, flags, to, tolen); +} + +/**************************************************************************** + * READV + ***************************************************************************/ + +static ssize_t swrap_recv(int s, void *buf, size_t len, int flags) +{ + struct socket_info *si; + struct msghdr msg; + struct swrap_address saddr = { + .sa_socklen = sizeof(struct sockaddr_storage), + }; + struct iovec tmp; + ssize_t ret; + int tret; + + si = find_socket_info(s); + if (si == NULL) { + return libc_recv(s, buf, len, flags); + } + + tmp.iov_base = buf; + tmp.iov_len = len; + + ZERO_STRUCT(msg); + msg.msg_name = &saddr.sa.s; /* optional address */ + msg.msg_namelen = saddr.sa_socklen; /* size of address */ + msg.msg_iov = &tmp; /* scatter/gather array */ + msg.msg_iovlen = 1; /* # elements in msg_iov */ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + tret = swrap_recvmsg_before(s, si, &msg, &tmp); + if (tret < 0) { + return -1; + } + + buf = msg.msg_iov[0].iov_base; + len = msg.msg_iov[0].iov_len; + + ret = libc_recv(s, buf, len, flags); + + tret = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret); + if (tret != 0) { + return tret; + } + + return ret; +} + +ssize_t recv(int s, void *buf, size_t len, int flags) +{ + return swrap_recv(s, buf, len, flags); +} + +/**************************************************************************** + * READ + ***************************************************************************/ + +static ssize_t swrap_read(int s, void *buf, size_t len) +{ + struct socket_info *si; + struct msghdr msg; + struct iovec tmp; + struct swrap_address saddr = { + .sa_socklen = sizeof(struct sockaddr_storage), + }; + ssize_t ret; + int tret; + + si = find_socket_info(s); + if (si == NULL) { + return libc_read(s, buf, len); + } + + tmp.iov_base = buf; + tmp.iov_len = len; + + ZERO_STRUCT(msg); + msg.msg_name = &saddr.sa.ss; /* optional address */ + msg.msg_namelen = saddr.sa_socklen; /* size of address */ + msg.msg_iov = &tmp; /* scatter/gather array */ + msg.msg_iovlen = 1; /* # elements in msg_iov */ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + tret = swrap_recvmsg_before(s, si, &msg, &tmp); + if (tret < 0) { + if (tret == -ENOTSOCK) { + return libc_read(s, buf, len); + } + return -1; + } + + buf = msg.msg_iov[0].iov_base; + len = msg.msg_iov[0].iov_len; + + ret = libc_read(s, buf, len); + + tret = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret); + if (tret != 0) { + return tret; + } + + return ret; +} + +ssize_t read(int s, void *buf, size_t len) +{ + return swrap_read(s, buf, len); +} + +/**************************************************************************** + * WRITE + ***************************************************************************/ + +static ssize_t swrap_write(int s, const void *buf, size_t len) +{ + struct msghdr msg; + struct iovec tmp; + struct sockaddr_un un_addr; + ssize_t ret; + int rc; + struct socket_info *si; + + si = find_socket_info(s); + if (si == NULL) { + return libc_write(s, buf, len); + } + + tmp.iov_base = discard_const_p(char, buf); + tmp.iov_len = len; + + ZERO_STRUCT(msg); + msg.msg_name = NULL; /* optional address */ + msg.msg_namelen = 0; /* size of address */ + msg.msg_iov = &tmp; /* scatter/gather array */ + msg.msg_iovlen = 1; /* # elements in msg_iov */ +#if HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL); + if (rc < 0) { + return -1; + } + + buf = msg.msg_iov[0].iov_base; + len = msg.msg_iov[0].iov_len; + + ret = libc_write(s, buf, len); + + swrap_sendmsg_after(s, si, &msg, NULL, ret); + + return ret; +} + +ssize_t write(int s, const void *buf, size_t len) +{ + return swrap_write(s, buf, len); +} + +/**************************************************************************** + * SEND + ***************************************************************************/ + +static ssize_t swrap_send(int s, const void *buf, size_t len, int flags) +{ + struct msghdr msg; + struct iovec tmp; + struct sockaddr_un un_addr; + ssize_t ret; + int rc; + struct socket_info *si = find_socket_info(s); + + if (!si) { + return libc_send(s, buf, len, flags); + } + + tmp.iov_base = discard_const_p(char, buf); + tmp.iov_len = len; + + ZERO_STRUCT(msg); + msg.msg_name = NULL; /* optional address */ + msg.msg_namelen = 0; /* size of address */ + msg.msg_iov = &tmp; /* scatter/gather array */ + msg.msg_iovlen = 1; /* # elements in msg_iov */ +#if HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL); + if (rc < 0) { + return -1; + } + + buf = msg.msg_iov[0].iov_base; + len = msg.msg_iov[0].iov_len; + + ret = libc_send(s, buf, len, flags); + + swrap_sendmsg_after(s, si, &msg, NULL, ret); + + return ret; +} + +ssize_t send(int s, const void *buf, size_t len, int flags) +{ + return swrap_send(s, buf, len, flags); +} + +/**************************************************************************** + * RECVMSG + ***************************************************************************/ + +static ssize_t swrap_recvmsg(int s, struct msghdr *omsg, int flags) +{ + struct swrap_address from_addr = { + .sa_socklen = sizeof(struct sockaddr_un), + }; + struct swrap_address convert_addr = { + .sa_socklen = sizeof(struct sockaddr_storage), + }; + struct socket_info *si; + struct msghdr msg; + struct iovec tmp; +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + size_t msg_ctrllen_filled; + size_t msg_ctrllen_left; +#endif + + ssize_t ret; + int rc; + + si = find_socket_info(s); + if (si == NULL) { + return libc_recvmsg(s, omsg, flags); + } + + tmp.iov_base = NULL; + tmp.iov_len = 0; + + ZERO_STRUCT(msg); + msg.msg_name = &from_addr.sa; /* optional address */ + msg.msg_namelen = from_addr.sa_socklen; /* size of address */ + msg.msg_iov = omsg->msg_iov; /* scatter/gather array */ + msg.msg_iovlen = omsg->msg_iovlen; /* # elements in msg_iov */ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg_ctrllen_filled = 0; + msg_ctrllen_left = omsg->msg_controllen; + + msg.msg_control = omsg->msg_control; /* ancillary data, see below */ + msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */ + msg.msg_flags = omsg->msg_flags; /* flags on received message */ +#endif + + rc = swrap_recvmsg_before(s, si, &msg, &tmp); + if (rc < 0) { + return -1; + } + + ret = libc_recvmsg(s, &msg, flags); + +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg_ctrllen_filled += msg.msg_controllen; + msg_ctrllen_left -= msg.msg_controllen; + + if (omsg->msg_control != NULL) { + uint8_t *p; + + p = omsg->msg_control; + p += msg_ctrllen_filled; + + msg.msg_control = p; + msg.msg_controllen = msg_ctrllen_left; + } else { + msg.msg_control = NULL; + msg.msg_controllen = 0; + } +#endif + + /* + * We convert the unix address to a IP address so we need a buffer + * which can store the address in case of SOCK_DGRAM, see below. + */ + msg.msg_name = &convert_addr.sa; + msg.msg_namelen = convert_addr.sa_socklen; + + rc = swrap_recvmsg_after(s, + si, + &msg, + &from_addr.sa.un, + from_addr.sa_socklen, + ret); + if (rc != 0) { + return rc; + } + +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + if (omsg->msg_control != NULL) { + /* msg.msg_controllen = space left */ + msg_ctrllen_left = msg.msg_controllen; + msg_ctrllen_filled = omsg->msg_controllen - msg_ctrllen_left; + } + + /* Update the original message length */ + omsg->msg_controllen = msg_ctrllen_filled; + omsg->msg_flags = msg.msg_flags; +#endif + omsg->msg_iovlen = msg.msg_iovlen; + + /* + * From the manpage: + * + * The msg_name field points to a caller-allocated buffer that is + * used to return the source address if the socket is unconnected. The + * caller should set msg_namelen to the size of this buffer before this + * call; upon return from a successful call, msg_name will contain the + * length of the returned address. If the application does not need + * to know the source address, msg_name can be specified as NULL. + */ + if (si->type == SOCK_STREAM) { + omsg->msg_namelen = 0; + } else if (omsg->msg_name != NULL && + omsg->msg_namelen != 0 && + omsg->msg_namelen >= msg.msg_namelen) { + memcpy(omsg->msg_name, msg.msg_name, msg.msg_namelen); + omsg->msg_namelen = msg.msg_namelen; + } + + return ret; +} + +ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags) +{ + return swrap_recvmsg(sockfd, msg, flags); +} + +/**************************************************************************** + * SENDMSG + ***************************************************************************/ + +static ssize_t swrap_sendmsg(int s, const struct msghdr *omsg, int flags) +{ + struct msghdr msg; + struct iovec tmp; + struct sockaddr_un un_addr; + const struct sockaddr_un *to_un = NULL; + const struct sockaddr *to = NULL; + ssize_t ret; + int rc; + struct socket_info *si = find_socket_info(s); + int bcast = 0; + + if (!si) { + return libc_sendmsg(s, omsg, flags); + } + + ZERO_STRUCT(un_addr); + + tmp.iov_base = NULL; + tmp.iov_len = 0; + + ZERO_STRUCT(msg); + + if (si->connected == 0) { + msg.msg_name = omsg->msg_name; /* optional address */ + msg.msg_namelen = omsg->msg_namelen; /* size of address */ + } + msg.msg_iov = omsg->msg_iov; /* scatter/gather array */ + msg.msg_iovlen = omsg->msg_iovlen; /* # elements in msg_iov */ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + if (msg.msg_controllen > 0 && msg.msg_control != NULL) { + /* omsg is a const so use a local buffer for modifications */ + uint8_t cmbuf[omsg->msg_controllen]; + + memcpy(cmbuf, omsg->msg_control, omsg->msg_controllen); + + msg.msg_control = cmbuf; /* ancillary data, see below */ + msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */ + } + msg.msg_flags = omsg->msg_flags; /* flags on received message */ +#endif + + rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, &to_un, &to, &bcast); + if (rc < 0) { + return -1; + } + + if (bcast) { +// struct stat st; +// unsigned int iface; + unsigned int prt = ntohs(((const struct sockaddr_in *)(const void *)to)->sin_port); + char type; + size_t i, len = 0; + uint8_t *buf; + off_t ofs = 0; + size_t avail = 0; + size_t remain; + + unsigned int remote_prt; + unsigned int in4_addr; + DIR *d; + struct dirent *dir; + + + 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); + } + */ + + + d = opendir(socket_wrapper_dir()); + if (d) { + while ((dir = readdir(d)) != NULL) { + if (dir->d_name[0] == SOCKET_TYPE_CHAR_UDP_LONG) + /* TODO - use S_ISSOCK ? */ + if (sscanf(dir->d_name, SOCKET_FORMAT_LONG, &type, &in4_addr, &remote_prt) == 3) + if (prt == remote_prt) { + snprintf(un_addr.sun_path, + sizeof(un_addr.sun_path), + "%s/%s", + socket_wrapper_dir(),dir->d_name); + libc_sendmsg(s, &msg, flags); + SWRAP_LOG(SWRAP_LOG_DEBUG,"send bcast packet to %s", dir->d_name); + } + } + closedir(d); + } + + swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len); + free(buf); + + return len; + } + + ret = libc_sendmsg(s, &msg, flags); + + swrap_sendmsg_after(s, si, &msg, to, ret); + + return ret; +} + +ssize_t sendmsg(int s, const struct msghdr *omsg, int flags) +{ + return swrap_sendmsg(s, omsg, flags); +} + +/**************************************************************************** + * READV + ***************************************************************************/ + +static ssize_t swrap_readv(int s, const struct iovec *vector, int count) +{ + struct socket_info *si; + struct msghdr msg; + struct iovec tmp; + struct swrap_address saddr = { + .sa_socklen = sizeof(struct sockaddr_storage) + }; + ssize_t ret; + int rc; + + si = find_socket_info(s); + if (si == NULL) { + return libc_readv(s, vector, count); + } + + tmp.iov_base = NULL; + tmp.iov_len = 0; + + ZERO_STRUCT(msg); + msg.msg_name = &saddr.sa.s; /* optional address */ + msg.msg_namelen = saddr.sa_socklen; /* size of address */ + msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */ + msg.msg_iovlen = count; /* # elements in msg_iov */ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + rc = swrap_recvmsg_before(s, si, &msg, &tmp); + if (rc < 0) { + if (rc == -ENOTSOCK) { + return libc_readv(s, vector, count); + } + return -1; + } + + ret = libc_readv(s, msg.msg_iov, msg.msg_iovlen); + + rc = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret); + if (rc != 0) { + return rc; + } + + return ret; +} + +ssize_t readv(int s, const struct iovec *vector, int count) +{ + return swrap_readv(s, vector, count); +} + +/**************************************************************************** + * WRITEV + ***************************************************************************/ + +static ssize_t swrap_writev(int s, const struct iovec *vector, int count) +{ + struct msghdr msg; + struct iovec tmp; + struct sockaddr_un un_addr; + ssize_t ret; + int rc; + struct socket_info *si = find_socket_info(s); + + if (!si) { + return libc_writev(s, vector, count); + } + + tmp.iov_base = NULL; + tmp.iov_len = 0; + + ZERO_STRUCT(msg); + msg.msg_name = NULL; /* optional address */ + msg.msg_namelen = 0; /* size of address */ + msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */ + msg.msg_iovlen = count; /* # elements in msg_iov */ +#if HAVE_STRUCT_MSGHDR_MSG_CONTROL + msg.msg_control = NULL; /* ancillary data, see below */ + msg.msg_controllen = 0; /* ancillary data buffer len */ + msg.msg_flags = 0; /* flags on received message */ +#endif + + rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL); + if (rc < 0) { + if (rc == -ENOTSOCK) { + return libc_readv(s, vector, count); + } + return -1; + } + + ret = libc_writev(s, msg.msg_iov, msg.msg_iovlen); + + swrap_sendmsg_after(s, si, &msg, NULL, ret); + + return ret; +} + +ssize_t writev(int s, const struct iovec *vector, int count) +{ + return swrap_writev(s, vector, count); +} + +/**************************** + * CLOSE + ***************************/ + +static int swrap_close(int fd) +{ + struct socket_info *si = find_socket_info(fd); + struct socket_info_fd *fi; + int ret; + + if (!si) { + return libc_close(fd); + } + + for (fi = si->fds; fi; fi = fi->next) { + if (fi->fd == fd) { + SWRAP_DLIST_REMOVE(si->fds, fi); + free(fi); + break; + } + } + + if (si->fds) { + /* there are still references left */ + return libc_close(fd); + } + + SWRAP_DLIST_REMOVE(sockets, si); + + if (si->myname.sa_socklen > 0 && si->peername.sa_socklen > 0) { + swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0); + } + + ret = libc_close(fd); + + if (si->myname.sa_socklen > 0 && si->peername.sa_socklen > 0) { + swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0); + swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0); + } + + if (si->un_addr.sun_path[0] != '\0') { + unlink(si->un_addr.sun_path); + } + free(si); + + return ret; +} + +int close(int fd) +{ + return swrap_close(fd); +} + +/**************************** + * DUP + ***************************/ + +static int swrap_dup(int fd) +{ + struct socket_info *si; + struct socket_info_fd *fi; + + si = find_socket_info(fd); + + if (!si) { + return libc_dup(fd); + } + + fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd)); + if (fi == NULL) { + errno = ENOMEM; + return -1; + } + + fi->fd = libc_dup(fd); + if (fi->fd == -1) { + int saved_errno = errno; + free(fi); + errno = saved_errno; + return -1; + } + + /* Make sure we don't have an entry for the fd */ + swrap_remove_stale(fi->fd); + + SWRAP_DLIST_ADD(si->fds, fi); + return fi->fd; +} + +int dup(int fd) +{ + return swrap_dup(fd); +} + +/**************************** + * DUP2 + ***************************/ + +static int swrap_dup2(int fd, int newfd) +{ + struct socket_info *si; + struct socket_info_fd *fi; + + si = find_socket_info(fd); + + if (!si) { + return libc_dup2(fd, newfd); + } + + if (find_socket_info(newfd)) { + /* dup2() does an implicit close of newfd, which we + * need to emulate */ + swrap_close(newfd); + } + + fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd)); + if (fi == NULL) { + errno = ENOMEM; + return -1; + } + + fi->fd = libc_dup2(fd, newfd); + if (fi->fd == -1) { + int saved_errno = errno; + free(fi); + errno = saved_errno; + return -1; + } + + /* Make sure we don't have an entry for the fd */ + swrap_remove_stale(fi->fd); + + SWRAP_DLIST_ADD(si->fds, fi); + return fi->fd; +} + +int dup2(int fd, int newfd) +{ + return swrap_dup2(fd, newfd); +} + +/**************************** + * FCNTL + ***************************/ + +static int swrap_vfcntl(int fd, int cmd, va_list va) +{ + struct socket_info_fd *fi; + struct socket_info *si; + int rc; + + si = find_socket_info(fd); + if (si == NULL) { + rc = libc_vfcntl(fd, cmd, va); + + return rc; + } + + switch (cmd) { + case F_DUPFD: + fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd)); + if (fi == NULL) { + errno = ENOMEM; + return -1; + } + + fi->fd = libc_vfcntl(fd, cmd, va); + if (fi->fd == -1) { + int saved_errno = errno; + free(fi); + errno = saved_errno; + return -1; + } + + /* Make sure we don't have an entry for the fd */ + swrap_remove_stale(fi->fd); + + SWRAP_DLIST_ADD(si->fds, fi); + + rc = fi->fd; + break; + default: + rc = libc_vfcntl(fd, cmd, va); + break; + } + + return rc; +} + +int fcntl(int fd, int cmd, ...) +{ + va_list va; + int rc; + + va_start(va, cmd); + + rc = swrap_vfcntl(fd, cmd, va); + + va_end(va); + + return rc; +} + +/**************************** + * EVENTFD + ***************************/ + +#ifdef HAVE_EVENTFD +static int swrap_eventfd(int count, int flags) +{ + int fd; + + fd = libc_eventfd(count, flags); + if (fd != -1) { + swrap_remove_stale(fd); + } + + return fd; +} + +#ifdef HAVE_EVENTFD_UNSIGNED_INT +int eventfd(unsigned int count, int flags) +#else +int eventfd(int count, int flags) +#endif +{ + return swrap_eventfd(count, flags); +} +#endif + +#ifdef HAVE_PLEDGE +int pledge(const char *promises, const char *paths[]) +{ + (void)promises; /* unused */ + (void)paths; /* unused */ + + return 0; +} +#endif /* HAVE_PLEDGE */ + +/**************************** + * DESTRUCTOR + ***************************/ + +/* + * This function is called when the library is unloaded and makes sure that + * sockets get closed and the unix file for the socket are unlinked. + */ +void swrap_destructor(void) +{ + struct socket_info *s = sockets; + + while (s != NULL) { + struct socket_info_fd *f = s->fds; + if (f != NULL) { + swrap_close(f->fd); + } + s = sockets; + } + + if (swrap.libc_handle != NULL) { + dlclose(swrap.libc_handle); + } + if (swrap.libsocket_handle) { + dlclose(swrap.libsocket_handle); + } +} |