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Diffstat (limited to 'third_party/socket_wrapper/socket_wrapper.c')
| -rw-r--r-- | third_party/socket_wrapper/socket_wrapper.c | 7890 |
1 files changed, 7890 insertions, 0 deletions
diff --git a/third_party/socket_wrapper/socket_wrapper.c b/third_party/socket_wrapper/socket_wrapper.c new file mode 100644 index 0000000..5804e93 --- /dev/null +++ b/third_party/socket_wrapper/socket_wrapper.c @@ -0,0 +1,7890 @@ +/* + * BSD 3-Clause License + * + * Copyright (c) 2005-2008, Jelmer Vernooij <jelmer@samba.org> + * Copyright (c) 2006-2021, Stefan Metzmacher <metze@samba.org> + * Copyright (c) 2013-2021, Andreas Schneider <asn@samba.org> + * Copyright (c) 2014-2017, Michael Adam <obnox@samba.org> + * Copyright (c) 2016-2018, Anoop C S <anoopcs@redhat.com> + * 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> +#ifdef HAVE_NETINET_TCP_FSM_H +#include <netinet/tcp_fsm.h> +#endif +#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 <pthread.h> + +#include "socket_wrapper.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_CONSTRUCTOR_ATTRIBUTE +#define CONSTRUCTOR_ATTRIBUTE __attribute__ ((constructor)) +#else +#define CONSTRUCTOR_ATTRIBUTE +#endif /* HAVE_CONSTRUCTOR_ATTRIBUTE */ + +#ifdef HAVE_DESTRUCTOR_ATTRIBUTE +#define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor)) +#else +#define DESTRUCTOR_ATTRIBUTE +#endif + +#ifndef FALL_THROUGH +# ifdef HAVE_FALLTHROUGH_ATTRIBUTE +# define FALL_THROUGH __attribute__ ((fallthrough)) +# else /* HAVE_FALLTHROUGH_ATTRIBUTE */ +# define FALL_THROUGH ((void)0) +# endif /* HAVE_FALLTHROUGH_ATTRIBUTE */ +#endif /* FALL_THROUGH */ + +#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 SAFE_FREE +#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } 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 + +#define UNUSED(x) (void)(x) + +#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 socket_wrapper_init_mutex(m) \ + _socket_wrapper_init_mutex(m, #m) + +/* Add new global locks here please */ +# define SWRAP_REINIT_ALL do { \ + int ret; \ + ret = socket_wrapper_init_mutex(&sockets_mutex); \ + if (ret != 0) exit(-1); \ + ret = socket_wrapper_init_mutex(&socket_reset_mutex); \ + if (ret != 0) exit(-1); \ + ret = socket_wrapper_init_mutex(&first_free_mutex); \ + if (ret != 0) exit(-1); \ + ret = socket_wrapper_init_mutex(&sockets_si_global); \ + if (ret != 0) exit(-1); \ + ret = socket_wrapper_init_mutex(&autobind_start_mutex); \ + if (ret != 0) exit(-1); \ + ret = socket_wrapper_init_mutex(&pcap_dump_mutex); \ + if (ret != 0) exit(-1); \ + ret = socket_wrapper_init_mutex(&mtu_update_mutex); \ + if (ret != 0) exit(-1); \ +} while(0) + +# define SWRAP_LOCK_ALL do { \ + swrap_mutex_lock(&sockets_mutex); \ + swrap_mutex_lock(&socket_reset_mutex); \ + swrap_mutex_lock(&first_free_mutex); \ + swrap_mutex_lock(&sockets_si_global); \ + swrap_mutex_lock(&autobind_start_mutex); \ + swrap_mutex_lock(&pcap_dump_mutex); \ + swrap_mutex_lock(&mtu_update_mutex); \ +} while(0) + +# define SWRAP_UNLOCK_ALL do { \ + swrap_mutex_unlock(&mtu_update_mutex); \ + swrap_mutex_unlock(&pcap_dump_mutex); \ + swrap_mutex_unlock(&autobind_start_mutex); \ + swrap_mutex_unlock(&sockets_si_global); \ + swrap_mutex_unlock(&first_free_mutex); \ + swrap_mutex_unlock(&socket_reset_mutex); \ + swrap_mutex_unlock(&sockets_mutex); \ +} while(0) + +#define SOCKET_INFO_CONTAINER(si) \ + (struct socket_info_container *)(si) + +#define SWRAP_LOCK_SI(si) do { \ + struct socket_info_container *sic = SOCKET_INFO_CONTAINER(si); \ + if (sic != NULL) { \ + swrap_mutex_lock(&sockets_si_global); \ + } else { \ + abort(); \ + } \ +} while(0) + +#define SWRAP_UNLOCK_SI(si) do { \ + struct socket_info_container *sic = SOCKET_INFO_CONTAINER(si); \ + if (sic != NULL) { \ + swrap_mutex_unlock(&sockets_si_global); \ + } else { \ + abort(); \ + } \ +} 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' + +/* + * 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 + +/* + * Maximum number of socket_info structures that can + * be used. Can be overriden by the environment variable + * SOCKET_WRAPPER_MAX_SOCKETS. + */ +#define SOCKET_WRAPPER_MAX_SOCKETS_DEFAULT 65535 + +#define SOCKET_WRAPPER_MAX_SOCKETS_LIMIT 262140 + +/* 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 64 + +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; +}; + +static int first_free; + +struct socket_info +{ + /* + * Remember to update swrap_unix_scm_right_magic + * on any change. + */ + + int family; + int type; + int protocol; + int bound; + int bcast; + int is_server; + int connected; + int defer_connect; + int pktinfo; + int tcp_nodelay; + int listening; + int fd_passed; + + /* 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_meta +{ + unsigned int refcount; + int next_free; + /* + * As long as we don't use shared memory + * for the sockets array, we use + * sockets_si_global as a single mutex. + * + * pthread_mutex_t mutex; + */ +}; + +struct socket_info_container +{ + struct socket_info info; + struct socket_info_meta meta; +}; + +static struct socket_info_container *sockets; + +static size_t socket_info_max = 0; + +/* + * Allocate the socket array always on the limit value. We want it to be + * at least bigger than the default so if we reach the limit we can + * still deal with duplicate fds pointing to the same socket_info. + */ +static size_t socket_fds_max = SOCKET_WRAPPER_MAX_SOCKETS_LIMIT; + +/* Hash table to map fds to corresponding socket_info index */ +static int *socket_fds_idx; + +/* Mutex for syncronizing port selection during swrap_auto_bind() */ +static pthread_mutex_t autobind_start_mutex = PTHREAD_MUTEX_INITIALIZER; + +/* Mutex to guard the initialization of array of socket_info structures */ +static pthread_mutex_t sockets_mutex = PTHREAD_MUTEX_INITIALIZER; + +/* Mutex to guard the socket reset in swrap_remove_wrapper() */ +static pthread_mutex_t socket_reset_mutex = PTHREAD_MUTEX_INITIALIZER; + +/* Mutex to synchronize access to first free index in socket_info array */ +static pthread_mutex_t first_free_mutex = PTHREAD_MUTEX_INITIALIZER; + +/* + * Mutex to synchronize access to to socket_info structures + * We use a single global mutex in order to avoid leaking + * ~ 38M copy on write memory per fork. + * max_sockets=65535 * sizeof(struct socket_info_container)=592 = 38796720 + */ +static pthread_mutex_t sockets_si_global = PTHREAD_MUTEX_INITIALIZER; + +/* Mutex to synchronize access to packet capture dump file */ +static pthread_mutex_t pcap_dump_mutex = PTHREAD_MUTEX_INITIALIZER; + +/* Mutex for synchronizing mtu value fetch*/ +static pthread_mutex_t mtu_update_mutex = PTHREAD_MUTEX_INITIALIZER; + +/* Function prototypes */ + +#if ! defined(HAVE_CONSTRUCTOR_ATTRIBUTE) && defined(HAVE_PRAGMA_INIT) +/* xlC and other oldschool compilers support (only) this */ +#pragma init (swrap_constructor) +#endif +void swrap_constructor(void) CONSTRUCTOR_ATTRIBUTE; +#if ! defined(HAVE_DESTRUCTOR_ATTRIBUTE) && defined(HAVE_PRAGMA_FINI) +#pragma fini (swrap_destructor) +#endif +void swrap_destructor(void) DESTRUCTOR_ATTRIBUTE; + +#ifndef HAVE_GETPROGNAME +static const char *getprogname(void) +{ +#if defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME) + return program_invocation_short_name; +#elif defined(HAVE_GETEXECNAME) + return getexecname(); +#else + return NULL; +#endif /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */ +} +#endif /* HAVE_GETPROGNAME */ + +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; + const char *prefix = "SWRAP"; + const char *progname = getprogname(); + + d = getenv("SOCKET_WRAPPER_DEBUGLEVEL"); + if (d != NULL) { + lvl = atoi(d); + } + + if (lvl < dbglvl) { + return; + } + + va_start(va, format); + vsnprintf(buffer, sizeof(buffer), format, va); + va_end(va); + + switch (dbglvl) { + case SWRAP_LOG_ERROR: + prefix = "SWRAP_ERROR"; + break; + case SWRAP_LOG_WARN: + prefix = "SWRAP_WARN"; + break; + case SWRAP_LOG_DEBUG: + prefix = "SWRAP_DEBUG"; + break; + case SWRAP_LOG_TRACE: + prefix = "SWRAP_TRACE"; + break; + } + + if (progname == NULL) { + progname = "<unknown>"; + } + + fprintf(stderr, + "%s[%s (%u)] - %s: %s\n", + prefix, + progname, + (unsigned int)getpid(), + func, + buffer); +} + +/********************************************************* + * SWRAP LOADING LIBC FUNCTIONS + *********************************************************/ + +#include <dlfcn.h> + +#ifdef HAVE_ACCEPT4 +typedef int (*__libc_accept4)(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen, + int flags); +#else +typedef int (*__libc_accept)(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen); +#endif +typedef int (*__libc_bind)(int sockfd, + const struct sockaddr *addr, + socklen_t addrlen); +typedef int (*__libc_close)(int fd); +#ifdef HAVE___CLOSE_NOCANCEL +typedef int (*__libc___close_nocancel)(int fd); +#endif +typedef int (*__libc_connect)(int sockfd, + const struct sockaddr *addr, + socklen_t addrlen); +typedef int (*__libc_dup)(int fd); +typedef int (*__libc_dup2)(int oldfd, int newfd); +typedef int (*__libc_fcntl)(int fd, int cmd, ...); +typedef FILE *(*__libc_fopen)(const char *name, const char *mode); +#ifdef HAVE_FOPEN64 +typedef FILE *(*__libc_fopen64)(const char *name, const char *mode); +#endif +#ifdef HAVE_EVENTFD +typedef int (*__libc_eventfd)(int count, int flags); +#endif +typedef int (*__libc_getpeername)(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen); +typedef int (*__libc_getsockname)(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen); +typedef int (*__libc_getsockopt)(int sockfd, + int level, + int optname, + void *optval, + socklen_t *optlen); +typedef int (*__libc_ioctl)(int d, unsigned long int request, ...); +typedef int (*__libc_listen)(int sockfd, int backlog); +typedef int (*__libc_open)(const char *pathname, int flags, ...); +#ifdef HAVE_OPEN64 +typedef int (*__libc_open64)(const char *pathname, int flags, ...); +#endif /* HAVE_OPEN64 */ +typedef int (*__libc_openat)(int dirfd, const char *path, int flags, ...); +typedef int (*__libc_pipe)(int pipefd[2]); +typedef int (*__libc_read)(int fd, void *buf, size_t count); +typedef ssize_t (*__libc_readv)(int fd, const struct iovec *iov, int iovcnt); +typedef int (*__libc_recv)(int sockfd, void *buf, size_t len, int flags); +typedef int (*__libc_recvfrom)(int sockfd, + void *buf, + size_t len, + int flags, + struct sockaddr *src_addr, + socklen_t *addrlen); +typedef int (*__libc_recvmsg)(int sockfd, const struct msghdr *msg, int flags); +typedef int (*__libc_send)(int sockfd, const void *buf, size_t len, int flags); +typedef int (*__libc_sendmsg)(int sockfd, const struct msghdr *msg, int flags); +typedef int (*__libc_sendto)(int sockfd, + const void *buf, + size_t len, + int flags, + const struct sockaddr *dst_addr, + socklen_t addrlen); +typedef int (*__libc_setsockopt)(int sockfd, + int level, + int optname, + const void *optval, + socklen_t optlen); +#ifdef HAVE_SIGNALFD +typedef int (*__libc_signalfd)(int fd, const sigset_t *mask, int flags); +#endif +typedef int (*__libc_socket)(int domain, int type, int protocol); +typedef int (*__libc_socketpair)(int domain, int type, int protocol, int sv[2]); +#ifdef HAVE_TIMERFD_CREATE +typedef int (*__libc_timerfd_create)(int clockid, int flags); +#endif +typedef ssize_t (*__libc_write)(int fd, const void *buf, size_t count); +typedef ssize_t (*__libc_writev)(int fd, const struct iovec *iov, int iovcnt); + +#define SWRAP_SYMBOL_ENTRY(i) \ + union { \ + __libc_##i f; \ + void *obj; \ + } _libc_##i + +struct swrap_libc_symbols { +#ifdef HAVE_ACCEPT4 + SWRAP_SYMBOL_ENTRY(accept4); +#else + SWRAP_SYMBOL_ENTRY(accept); +#endif + SWRAP_SYMBOL_ENTRY(bind); + SWRAP_SYMBOL_ENTRY(close); +#ifdef HAVE___CLOSE_NOCANCEL + SWRAP_SYMBOL_ENTRY(__close_nocancel); +#endif + SWRAP_SYMBOL_ENTRY(connect); + SWRAP_SYMBOL_ENTRY(dup); + SWRAP_SYMBOL_ENTRY(dup2); + SWRAP_SYMBOL_ENTRY(fcntl); + SWRAP_SYMBOL_ENTRY(fopen); +#ifdef HAVE_FOPEN64 + SWRAP_SYMBOL_ENTRY(fopen64); +#endif +#ifdef HAVE_EVENTFD + SWRAP_SYMBOL_ENTRY(eventfd); +#endif + SWRAP_SYMBOL_ENTRY(getpeername); + SWRAP_SYMBOL_ENTRY(getsockname); + SWRAP_SYMBOL_ENTRY(getsockopt); + SWRAP_SYMBOL_ENTRY(ioctl); + SWRAP_SYMBOL_ENTRY(listen); + SWRAP_SYMBOL_ENTRY(open); +#ifdef HAVE_OPEN64 + SWRAP_SYMBOL_ENTRY(open64); +#endif + SWRAP_SYMBOL_ENTRY(openat); + SWRAP_SYMBOL_ENTRY(pipe); + SWRAP_SYMBOL_ENTRY(read); + SWRAP_SYMBOL_ENTRY(readv); + SWRAP_SYMBOL_ENTRY(recv); + SWRAP_SYMBOL_ENTRY(recvfrom); + SWRAP_SYMBOL_ENTRY(recvmsg); + SWRAP_SYMBOL_ENTRY(send); + SWRAP_SYMBOL_ENTRY(sendmsg); + SWRAP_SYMBOL_ENTRY(sendto); + SWRAP_SYMBOL_ENTRY(setsockopt); +#ifdef HAVE_SIGNALFD + SWRAP_SYMBOL_ENTRY(signalfd); +#endif + SWRAP_SYMBOL_ENTRY(socket); + SWRAP_SYMBOL_ENTRY(socketpair); +#ifdef HAVE_TIMERFD_CREATE + SWRAP_SYMBOL_ENTRY(timerfd_create); +#endif + SWRAP_SYMBOL_ENTRY(write); + SWRAP_SYMBOL_ENTRY(writev); +}; + +struct swrap { + struct { + void *handle; + void *socket_handle; + struct swrap_libc_symbols symbols; + } libc; +}; + +static struct swrap swrap; + +/* prototypes */ +static char *socket_wrapper_dir(void); + +#define LIBC_NAME "libc.so" + +enum swrap_lib { + SWRAP_LIBC, + SWRAP_LIBSOCKET, +}; + +static const char *swrap_str_lib(enum swrap_lib lib) +{ + switch (lib) { + case SWRAP_LIBC: + return "libc"; + case SWRAP_LIBSOCKET: + return "libsocket"; + } + + /* Compiler would warn us about unhandled enum value if we get here */ + return "unknown"; +} + +static void *swrap_load_lib_handle(enum swrap_lib lib) +{ + int flags = RTLD_LAZY; + void *handle = NULL; + int i; + +#ifdef RTLD_DEEPBIND + const char *env_preload = getenv("LD_PRELOAD"); + const char *env_deepbind = getenv("SOCKET_WRAPPER_DISABLE_DEEPBIND"); + bool enable_deepbind = true; + + /* Don't do a deepbind if we run with libasan */ + if (env_preload != NULL && strlen(env_preload) < 1024) { + const char *p = strstr(env_preload, "libasan.so"); + if (p != NULL) { + enable_deepbind = false; + } + } + + if (env_deepbind != NULL && strlen(env_deepbind) >= 1) { + enable_deepbind = false; + } + + if (enable_deepbind) { + flags |= RTLD_DEEPBIND; + } +#endif + + switch (lib) { + case SWRAP_LIBSOCKET: +#ifdef HAVE_LIBSOCKET + handle = swrap.libc.socket_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.libc.socket_handle = handle; + } + break; +#endif + 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.libc.socket_handle = RTLD_NEXT; +#else + SWRAP_LOG(SWRAP_LOG_ERROR, + "Failed to dlopen library: %s", + dlerror()); + exit(-1); +#endif + } + + return handle; +} + +static void *_swrap_bind_symbol(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", + fn_name, + dlerror()); + exit(-1); + } + + SWRAP_LOG(SWRAP_LOG_TRACE, + "Loaded %s from %s", + fn_name, + swrap_str_lib(lib)); + + return func; +} + +#define swrap_mutex_lock(m) _swrap_mutex_lock(m, #m, __func__, __LINE__) +static void _swrap_mutex_lock(pthread_mutex_t *mutex, const char *name, const char *caller, unsigned line) +{ + int ret; + + ret = pthread_mutex_lock(mutex); + if (ret != 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, "PID(%d):PPID(%d): %s(%u): Couldn't lock pthread mutex(%s) - %s", + getpid(), getppid(), caller, line, name, strerror(ret)); + abort(); + } +} + +#define swrap_mutex_unlock(m) _swrap_mutex_unlock(m, #m, __func__, __LINE__) +static void _swrap_mutex_unlock(pthread_mutex_t *mutex, const char *name, const char *caller, unsigned line) +{ + int ret; + + ret = pthread_mutex_unlock(mutex); + if (ret != 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, "PID(%d):PPID(%d): %s(%u): Couldn't unlock pthread mutex(%s) - %s", + getpid(), getppid(), caller, line, name, strerror(ret)); + abort(); + } +} + +/* + * These macros have a thread race condition on purpose! + * + * This is an optimization to avoid locking each time we check if the symbol is + * bound. + */ +#define _swrap_bind_symbol_generic(lib, sym_name) do { \ + swrap.libc.symbols._libc_##sym_name.obj = \ + _swrap_bind_symbol(lib, #sym_name); \ +} while(0); + +#define swrap_bind_symbol_libc(sym_name) \ + _swrap_bind_symbol_generic(SWRAP_LIBC, sym_name) + +#define swrap_bind_symbol_libsocket(sym_name) \ + _swrap_bind_symbol_generic(SWRAP_LIBSOCKET, sym_name) + +static void swrap_bind_symbol_all(void); + +/**************************************************************************** + * 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_bind_symbol_all(); + + return swrap.libc.symbols._libc_accept4.f(sockfd, addr, addrlen, flags); +} + +#else /* HAVE_ACCEPT4 */ + +static int libc_accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_accept.f(sockfd, addr, addrlen); +} +#endif /* HAVE_ACCEPT4 */ + +static int libc_bind(int sockfd, + const struct sockaddr *addr, + socklen_t addrlen) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_bind.f(sockfd, addr, addrlen); +} + +static int libc_close(int fd) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_close.f(fd); +} + +#ifdef HAVE___CLOSE_NOCANCEL +static int libc___close_nocancel(int fd) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc___close_nocancel.f(fd); +} +#endif /* HAVE___CLOSE_NOCANCEL */ + +static int libc_connect(int sockfd, + const struct sockaddr *addr, + socklen_t addrlen) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_connect.f(sockfd, addr, addrlen); +} + +static int libc_dup(int fd) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_dup.f(fd); +} + +static int libc_dup2(int oldfd, int newfd) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_dup2.f(oldfd, newfd); +} + +#ifdef HAVE_EVENTFD +static int libc_eventfd(int count, int flags) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_eventfd.f(count, flags); +} +#endif + +DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE +static int libc_vfcntl(int fd, int cmd, va_list ap) +{ + void *arg; + int rc; + + swrap_bind_symbol_all(); + + arg = va_arg(ap, void *); + + rc = swrap.libc.symbols._libc_fcntl.f(fd, cmd, arg); + + return rc; +} + +static int libc_getpeername(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_getpeername.f(sockfd, addr, addrlen); +} + +static int libc_getsockname(int sockfd, + struct sockaddr *addr, + socklen_t *addrlen) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_getsockname.f(sockfd, addr, addrlen); +} + +static int libc_getsockopt(int sockfd, + int level, + int optname, + void *optval, + socklen_t *optlen) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_getsockopt.f(sockfd, + level, + optname, + optval, + optlen); +} + +DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE +static int libc_vioctl(int d, unsigned long int request, va_list ap) +{ + void *arg; + int rc; + + swrap_bind_symbol_all(); + + arg = va_arg(ap, void *); + + rc = swrap.libc.symbols._libc_ioctl.f(d, request, arg); + + return rc; +} + +static int libc_listen(int sockfd, int backlog) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_listen.f(sockfd, backlog); +} + +static FILE *libc_fopen(const char *name, const char *mode) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_fopen.f(name, mode); +} + +#ifdef HAVE_FOPEN64 +static FILE *libc_fopen64(const char *name, const char *mode) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_fopen64.f(name, mode); +} +#endif /* HAVE_FOPEN64 */ + +static int libc_vopen(const char *pathname, int flags, va_list ap) +{ + int mode = 0; + int fd; + + swrap_bind_symbol_all(); + + if (flags & O_CREAT) { + mode = va_arg(ap, int); + } + fd = swrap.libc.symbols._libc_open.f(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; +} + +#ifdef HAVE_OPEN64 +static int libc_vopen64(const char *pathname, int flags, va_list ap) +{ + int mode = 0; + int fd; + + swrap_bind_symbol_all(); + + if (flags & O_CREAT) { + mode = va_arg(ap, int); + } + fd = swrap.libc.symbols._libc_open64.f(pathname, flags, (mode_t)mode); + + return fd; +} +#endif /* HAVE_OPEN64 */ + +static int libc_vopenat(int dirfd, const char *path, int flags, va_list ap) +{ + int mode = 0; + int fd; + + swrap_bind_symbol_all(); + + if (flags & O_CREAT) { + mode = va_arg(ap, int); + } + fd = swrap.libc.symbols._libc_openat.f(dirfd, + path, + flags, + (mode_t)mode); + + return fd; +} + +#if 0 +static int libc_openat(int dirfd, const char *path, int flags, ...) +{ + va_list ap; + int fd; + + va_start(ap, flags); + fd = libc_vopenat(dirfd, path, flags, ap); + va_end(ap); + + return fd; +} +#endif + +static int libc_pipe(int pipefd[2]) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_pipe.f(pipefd); +} + +static int libc_read(int fd, void *buf, size_t count) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_read.f(fd, buf, count); +} + +static ssize_t libc_readv(int fd, const struct iovec *iov, int iovcnt) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_readv.f(fd, iov, iovcnt); +} + +static int libc_recv(int sockfd, void *buf, size_t len, int flags) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_recv.f(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_bind_symbol_all(); + + return swrap.libc.symbols._libc_recvfrom.f(sockfd, + buf, + len, + flags, + src_addr, + addrlen); +} + +static int libc_recvmsg(int sockfd, struct msghdr *msg, int flags) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_recvmsg.f(sockfd, msg, flags); +} + +static int libc_send(int sockfd, const void *buf, size_t len, int flags) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_send.f(sockfd, buf, len, flags); +} + +static int libc_sendmsg(int sockfd, const struct msghdr *msg, int flags) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_sendmsg.f(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_bind_symbol_all(); + + return swrap.libc.symbols._libc_sendto.f(sockfd, + buf, + len, + flags, + dst_addr, + addrlen); +} + +static int libc_setsockopt(int sockfd, + int level, + int optname, + const void *optval, + socklen_t optlen) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_setsockopt.f(sockfd, + level, + optname, + optval, + optlen); +} + +#ifdef HAVE_SIGNALFD +static int libc_signalfd(int fd, const sigset_t *mask, int flags) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_signalfd.f(fd, mask, flags); +} +#endif + +static int libc_socket(int domain, int type, int protocol) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_socket.f(domain, type, protocol); +} + +static int libc_socketpair(int domain, int type, int protocol, int sv[2]) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_socketpair.f(domain, type, protocol, sv); +} + +#ifdef HAVE_TIMERFD_CREATE +static int libc_timerfd_create(int clockid, int flags) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_timerfd_create.f(clockid, flags); +} +#endif + +static ssize_t libc_write(int fd, const void *buf, size_t count) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_write.f(fd, buf, count); +} + +static ssize_t libc_writev(int fd, const struct iovec *iov, int iovcnt) +{ + swrap_bind_symbol_all(); + + return swrap.libc.symbols._libc_writev.f(fd, iov, iovcnt); +} + +/* DO NOT call this function during library initialization! */ +static void __swrap_bind_symbol_all_once(void) +{ +#ifdef HAVE_ACCEPT4 + swrap_bind_symbol_libsocket(accept4); +#else + swrap_bind_symbol_libsocket(accept); +#endif + swrap_bind_symbol_libsocket(bind); + swrap_bind_symbol_libc(close); +#ifdef HAVE___CLOSE_NOCANCEL + swrap_bind_symbol_libc(__close_nocancel); +#endif + swrap_bind_symbol_libsocket(connect); + swrap_bind_symbol_libc(dup); + swrap_bind_symbol_libc(dup2); + swrap_bind_symbol_libc(fcntl); + swrap_bind_symbol_libc(fopen); +#ifdef HAVE_FOPEN64 + swrap_bind_symbol_libc(fopen64); +#endif +#ifdef HAVE_EVENTFD + swrap_bind_symbol_libc(eventfd); +#endif + swrap_bind_symbol_libsocket(getpeername); + swrap_bind_symbol_libsocket(getsockname); + swrap_bind_symbol_libsocket(getsockopt); + swrap_bind_symbol_libc(ioctl); + swrap_bind_symbol_libsocket(listen); + swrap_bind_symbol_libc(open); +#ifdef HAVE_OPEN64 + swrap_bind_symbol_libc(open64); +#endif + swrap_bind_symbol_libc(openat); + swrap_bind_symbol_libsocket(pipe); + swrap_bind_symbol_libc(read); + swrap_bind_symbol_libsocket(readv); + swrap_bind_symbol_libsocket(recv); + swrap_bind_symbol_libsocket(recvfrom); + swrap_bind_symbol_libsocket(recvmsg); + swrap_bind_symbol_libsocket(send); + swrap_bind_symbol_libsocket(sendmsg); + swrap_bind_symbol_libsocket(sendto); + swrap_bind_symbol_libsocket(setsockopt); +#ifdef HAVE_SIGNALFD + swrap_bind_symbol_libsocket(signalfd); +#endif + swrap_bind_symbol_libsocket(socket); + swrap_bind_symbol_libsocket(socketpair); +#ifdef HAVE_TIMERFD_CREATE + swrap_bind_symbol_libc(timerfd_create); +#endif + swrap_bind_symbol_libc(write); + swrap_bind_symbol_libsocket(writev); +} + +static void swrap_bind_symbol_all(void) +{ + static pthread_once_t all_symbol_binding_once = PTHREAD_ONCE_INIT; + + pthread_once(&all_symbol_binding_once, __swrap_bind_symbol_all_once); +} + +/********************************************************* + * SWRAP HELPER FUNCTIONS + *********************************************************/ + +/* + * We return 127.0.0.0 (default) or 10.53.57.0. + * + * This can be controlled by: + * SOCKET_WRAPPER_IPV4_NETWORK=127.0.0.0 (default) + * or + * SOCKET_WRAPPER_IPV4_NETWORK=10.53.57.0 + */ +static in_addr_t swrap_ipv4_net(void) +{ + static int initialized; + static in_addr_t hv; + const char *net_str = NULL; + struct in_addr nv; + int ret; + + if (initialized) { + return hv; + } + initialized = 1; + + net_str = getenv("SOCKET_WRAPPER_IPV4_NETWORK"); + if (net_str == NULL) { + net_str = "127.0.0.0"; + } + + ret = inet_pton(AF_INET, net_str, &nv); + if (ret <= 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "INVALID IPv4 Network [%s]", + net_str); + abort(); + } + + hv = ntohl(nv.s_addr); + + switch (hv) { + case 0x7f000000: + /* 127.0.0.0 */ + break; + case 0x0a353900: + /* 10.53.57.0 */ + break; + default: + SWRAP_LOG(SWRAP_LOG_ERROR, + "INVALID IPv4 Network [%s][0x%x] should be " + "127.0.0.0 or 10.53.57.0", + net_str, (unsigned)hv); + abort(); + } + + return hv; +} + +/* + * This returns 127.255.255.255 or 10.255.255.255 + */ +static in_addr_t swrap_ipv4_bcast(void) +{ + in_addr_t hv; + + hv = swrap_ipv4_net(); + hv |= IN_CLASSA_HOST; + + return hv; +} + +/* + * This returns 127.0.0.${iface} or 10.53.57.${iface} + */ +static in_addr_t swrap_ipv4_iface(unsigned int iface) +{ + in_addr_t hv; + + if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "swrap_ipv4_iface(%u) invalid!", + iface); + abort(); + return -1; + } + + hv = swrap_ipv4_net(); + hv |= iface; + + return hv; +} + +#ifdef HAVE_IPV6 +/* + * FD00::5357:5FXX + */ +static const struct in6_addr *swrap_ipv6(void) +{ + static struct in6_addr v; + static int initialized; + int ret; + + if (initialized) { + return &v; + } + initialized = 1; + + ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v); + if (ret <= 0) { + abort(); + } + + return &v; +} +#endif + +static void set_port(int family, int prt, struct swrap_address *addr) +{ + switch (family) { + case AF_INET: + addr->sa.in.sin_port = htons(prt); + break; +#ifdef HAVE_IPV6 + case AF_INET6: + addr->sa.in6.sin6_port = htons(prt); + break; +#endif + } +} + +static size_t socket_length(int family) +{ + switch (family) { + case AF_INET: + return sizeof(struct sockaddr_in); +#ifdef HAVE_IPV6 + case AF_INET6: + return sizeof(struct sockaddr_in6); +#endif + } + return 0; +} + +static struct socket_info *swrap_get_socket_info(int si_index) +{ + return (struct socket_info *)(&(sockets[si_index].info)); +} + +static int swrap_get_refcount(struct socket_info *si) +{ + struct socket_info_container *sic = SOCKET_INFO_CONTAINER(si); + return sic->meta.refcount; +} + +static void swrap_inc_refcount(struct socket_info *si) +{ + struct socket_info_container *sic = SOCKET_INFO_CONTAINER(si); + + sic->meta.refcount += 1; +} + +static void swrap_dec_refcount(struct socket_info *si) +{ + struct socket_info_container *sic = SOCKET_INFO_CONTAINER(si); + + sic->meta.refcount -= 1; +} + +static int swrap_get_next_free(struct socket_info *si) +{ + struct socket_info_container *sic = SOCKET_INFO_CONTAINER(si); + + return sic->meta.next_free; +} + +static void swrap_set_next_free(struct socket_info *si, int next_free) +{ + struct socket_info_container *sic = SOCKET_INFO_CONTAINER(si); + + sic->meta.next_free = next_free; +} + +static int swrap_un_path(struct sockaddr_un *un, + const char *swrap_dir, + char type, + unsigned int iface, + unsigned int prt) +{ + int ret; + + ret = snprintf(un->sun_path, + sizeof(un->sun_path), + "%s/"SOCKET_FORMAT, + swrap_dir, + type, + iface, + prt); + if ((size_t)ret >= sizeof(un->sun_path)) { + return ENAMETOOLONG; + } + + return 0; +} + +static int swrap_un_path_EINVAL(struct sockaddr_un *un, + const char *swrap_dir) +{ + int ret; + + ret = snprintf(un->sun_path, + sizeof(un->sun_path), + "%s/EINVAL", + swrap_dir); + + if ((size_t)ret >= sizeof(un->sun_path)) { + return ENAMETOOLONG; + } + + return 0; +} + +static bool swrap_dir_usable(const char *swrap_dir) +{ + struct sockaddr_un un; + int ret; + + ret = swrap_un_path(&un, swrap_dir, SOCKET_TYPE_CHAR_TCP, 0, 0); + if (ret == 0) { + return true; + } + + ret = swrap_un_path_EINVAL(&un, swrap_dir); + if (ret == 0) { + return true; + } + + return false; +} + +static char *socket_wrapper_dir(void) +{ + char *swrap_dir = NULL; + char *s = getenv("SOCKET_WRAPPER_DIR"); + char *t; + bool ok; + + if (s == NULL || s[0] == '\0') { + SWRAP_LOG(SWRAP_LOG_WARN, "SOCKET_WRAPPER_DIR not set"); + return NULL; + } + + swrap_dir = realpath(s, NULL); + if (swrap_dir == NULL) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "Unable to resolve socket_wrapper dir path: %s - %s", + s, + strerror(errno)); + abort(); + } + + ok = swrap_dir_usable(swrap_dir); + if (ok) { + goto done; + } + + free(swrap_dir); + + ok = swrap_dir_usable(s); + if (!ok) { + SWRAP_LOG(SWRAP_LOG_ERROR, "SOCKET_WRAPPER_DIR is too long"); + abort(); + } + + t = getenv("SOCKET_WRAPPER_DIR_ALLOW_ORIG"); + if (t == NULL) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "realpath(SOCKET_WRAPPER_DIR) too long and " + "SOCKET_WRAPPER_DIR_ALLOW_ORIG not set"); + abort(); + + } + + swrap_dir = strdup(s); + if (swrap_dir == NULL) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "Unable to duplicate socket_wrapper dir path"); + abort(); + } + + SWRAP_LOG(SWRAP_LOG_WARN, + "realpath(SOCKET_WRAPPER_DIR) too long, " + "using original SOCKET_WRAPPER_DIR\n"); + +done: + SWRAP_LOG(SWRAP_LOG_TRACE, "socket_wrapper_dir: %s", swrap_dir); + return swrap_dir; +} + +static unsigned int socket_wrapper_mtu(void) +{ + static unsigned int max_mtu = 0; + unsigned int tmp; + const char *s; + char *endp; + + swrap_mutex_lock(&mtu_update_mutex); + + if (max_mtu != 0) { + goto done; + } + + 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: + swrap_mutex_unlock(&mtu_update_mutex); + return max_mtu; +} + +static int _socket_wrapper_init_mutex(pthread_mutex_t *m, const char *name) +{ + pthread_mutexattr_t ma; + bool need_destroy = false; + int ret = 0; + +#define __CHECK(cmd) do { \ + ret = cmd; \ + if (ret != 0) { \ + SWRAP_LOG(SWRAP_LOG_ERROR, \ + "%s: %s - failed %d", \ + name, #cmd, ret); \ + goto done; \ + } \ +} while(0) + + *m = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER; + __CHECK(pthread_mutexattr_init(&ma)); + need_destroy = true; + __CHECK(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_ERRORCHECK)); + __CHECK(pthread_mutex_init(m, &ma)); +done: + if (need_destroy) { + pthread_mutexattr_destroy(&ma); + } + return ret; +} + +static size_t socket_wrapper_max_sockets(void) +{ + const char *s; + size_t tmp; + char *endp; + + if (socket_info_max != 0) { + return socket_info_max; + } + + socket_info_max = SOCKET_WRAPPER_MAX_SOCKETS_DEFAULT; + + s = getenv("SOCKET_WRAPPER_MAX_SOCKETS"); + if (s == NULL || s[0] == '\0') { + goto done; + } + + tmp = strtoul(s, &endp, 10); + if (s == endp) { + goto done; + } + if (tmp == 0) { + tmp = SOCKET_WRAPPER_MAX_SOCKETS_DEFAULT; + SWRAP_LOG(SWRAP_LOG_ERROR, + "Invalid number of sockets specified, " + "using default (%zu)", + tmp); + } + + if (tmp > SOCKET_WRAPPER_MAX_SOCKETS_LIMIT) { + tmp = SOCKET_WRAPPER_MAX_SOCKETS_LIMIT; + SWRAP_LOG(SWRAP_LOG_ERROR, + "Invalid number of sockets specified, " + "using maximum (%zu).", + tmp); + } + + socket_info_max = tmp; + +done: + return socket_info_max; +} + +static void socket_wrapper_init_fds_idx(void) +{ + int *tmp = NULL; + size_t i; + + if (socket_fds_idx != NULL) { + return; + } + + tmp = (int *)calloc(socket_fds_max, sizeof(int)); + if (tmp == NULL) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "Failed to allocate socket fds index array: %s", + strerror(errno)); + exit(-1); + } + + for (i = 0; i < socket_fds_max; i++) { + tmp[i] = -1; + } + + socket_fds_idx = tmp; +} + +static void socket_wrapper_init_sockets(void) +{ + size_t max_sockets; + size_t i; + int ret = 0; + + swrap_bind_symbol_all(); + + swrap_mutex_lock(&sockets_mutex); + + if (sockets != NULL) { + swrap_mutex_unlock(&sockets_mutex); + return; + } + + SWRAP_LOG(SWRAP_LOG_DEBUG, + "SOCKET_WRAPPER_PACKAGE[%s] SOCKET_WRAPPER_VERSION[%s]", + SOCKET_WRAPPER_PACKAGE, SOCKET_WRAPPER_VERSION); + + /* + * Intialize the static cache early before + * any thread is able to start. + */ + (void)swrap_ipv4_net(); + + socket_wrapper_init_fds_idx(); + + /* Needs to be called inside the sockets_mutex lock here. */ + max_sockets = socket_wrapper_max_sockets(); + + sockets = (struct socket_info_container *)calloc(max_sockets, + sizeof(struct socket_info_container)); + + if (sockets == NULL) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "Failed to allocate sockets array: %s", + strerror(errno)); + swrap_mutex_unlock(&sockets_mutex); + exit(-1); + } + + swrap_mutex_lock(&first_free_mutex); + swrap_mutex_lock(&sockets_si_global); + + first_free = 0; + + for (i = 0; i < max_sockets; i++) { + swrap_set_next_free(&sockets[i].info, i+1); + } + + /* mark the end of the free list */ + swrap_set_next_free(&sockets[max_sockets-1].info, -1); + + swrap_mutex_unlock(&sockets_si_global); + swrap_mutex_unlock(&first_free_mutex); + swrap_mutex_unlock(&sockets_mutex); + if (ret != 0) { + exit(-1); + } +} + +bool socket_wrapper_enabled(void) +{ + char *s = socket_wrapper_dir(); + + if (s == NULL) { + return false; + } + + SAFE_FREE(s); + + socket_wrapper_init_sockets(); + + return true; +} + +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 void set_socket_info_index(int fd, int idx) +{ + SWRAP_LOG(SWRAP_LOG_TRACE, + "fd=%d idx=%d", + fd, idx); + socket_fds_idx[fd] = idx; + /* This builtin issues a full memory barrier. */ + __sync_synchronize(); +} + +static void reset_socket_info_index(int fd) +{ + SWRAP_LOG(SWRAP_LOG_TRACE, + "fd=%d idx=%d", + fd, -1); + set_socket_info_index(fd, -1); +} + +static int find_socket_info_index(int fd) +{ + if (fd < 0) { + return -1; + } + + if (socket_fds_idx == NULL) { + return -1; + } + + if ((size_t)fd >= socket_fds_max) { + /* + * Do not add a log here as some applications do stupid things + * like: + * + * for (fd = 0; fd <= getdtablesize(); fd++) { + * close(fd) + * }; + * + * This would produce millions of lines of debug messages. + */ +#if 0 + SWRAP_LOG(SWRAP_LOG_ERROR, + "Looking for a socket info for the fd %d is over the " + "max socket index limit of %zu.", + fd, + socket_fds_max); +#endif + return -1; + } + + /* This builtin issues a full memory barrier. */ + __sync_synchronize(); + return socket_fds_idx[fd]; +} + +static int swrap_add_socket_info(const struct socket_info *si_input) +{ + struct socket_info *si = NULL; + int si_index = -1; + + if (si_input == NULL) { + errno = EINVAL; + return -1; + } + + swrap_mutex_lock(&first_free_mutex); + if (first_free == -1) { + errno = ENFILE; + goto out; + } + + si_index = first_free; + si = swrap_get_socket_info(si_index); + + SWRAP_LOCK_SI(si); + + first_free = swrap_get_next_free(si); + *si = *si_input; + swrap_inc_refcount(si); + + SWRAP_UNLOCK_SI(si); + +out: + swrap_mutex_unlock(&first_free_mutex); + + return si_index; +} + +static int swrap_create_socket(struct socket_info *si, int fd) +{ + int idx; + + if ((size_t)fd >= socket_fds_max) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "The max socket index limit of %zu has been reached, " + "trying to add %d", + socket_fds_max, + fd); + errno = EMFILE; + return -1; + } + + idx = swrap_add_socket_info(si); + if (idx == -1) { + return -1; + } + + set_socket_info_index(fd, idx); + + return idx; +} + +static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len) +{ + unsigned int iface; + unsigned int prt; + const char *p; + char type; + + p = strrchr(un->sun_path, '/'); + if (p) p++; else p = un->sun_path; + + if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) { + SWRAP_LOG(SWRAP_LOG_ERROR, "sun_path[%s] p[%s]", + un->sun_path, p); + errno = EINVAL; + return -1; + } + + if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) { + SWRAP_LOG(SWRAP_LOG_ERROR, "type %c iface %u port %u", + type, iface, prt); + errno = EINVAL; + return -1; + } + + if (prt > 0xFFFF) { + SWRAP_LOG(SWRAP_LOG_ERROR, "type %c iface %u port %u", + type, iface, prt); + errno = EINVAL; + return -1; + } + + SWRAP_LOG(SWRAP_LOG_TRACE, "type %c iface %u port %u", + type, iface, prt); + + switch(type) { + case SOCKET_TYPE_CHAR_TCP: + case SOCKET_TYPE_CHAR_UDP: { + struct sockaddr_in *in2 = (struct sockaddr_in *)(void *)in; + + if ((*len) < sizeof(*in2)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "V4: *len(%zu) < sizeof(*in2)=%zu", + (size_t)*len, sizeof(*in2)); + errno = EINVAL; + return -1; + } + + memset(in2, 0, sizeof(*in2)); + in2->sin_family = AF_INET; + in2->sin_addr.s_addr = htonl(swrap_ipv4_iface(iface)); + in2->sin_port = htons(prt); + + *len = sizeof(*in2); + break; + } +#ifdef HAVE_IPV6 + case SOCKET_TYPE_CHAR_TCP_V6: + case SOCKET_TYPE_CHAR_UDP_V6: { + struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)(void *)in; + + if ((*len) < sizeof(*in2)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "V6: *len(%zu) < sizeof(*in2)=%zu", + (size_t)*len, sizeof(*in2)); + SWRAP_LOG(SWRAP_LOG_ERROR, "LINE:%d", __LINE__); + errno = EINVAL; + return -1; + } + + memset(in2, 0, sizeof(*in2)); + in2->sin6_family = AF_INET6; + in2->sin6_addr = *swrap_ipv6(); + in2->sin6_addr.s6_addr[15] = iface; + in2->sin6_port = htons(prt); + + *len = sizeof(*in2); + break; + } +#endif + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "type %c iface %u port %u", + type, iface, prt); + errno = EINVAL; + return -1; + } + + return 0; +} + +static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un, + int *bcast) +{ + char type = '\0'; + unsigned int prt; + unsigned int iface; + int is_bcast = 0; + char *swrap_dir = NULL; + + 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'; + const unsigned int sw_net_addr = swrap_ipv4_net(); + const unsigned int sw_bcast_addr = swrap_ipv4_bcast(); + + switch (si->type) { + case SOCK_STREAM: + u_type = SOCKET_TYPE_CHAR_TCP; + break; + case SOCK_DGRAM: + u_type = SOCKET_TYPE_CHAR_UDP; + a_type = SOCKET_TYPE_CHAR_UDP; + b_type = SOCKET_TYPE_CHAR_UDP; + break; + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!"); + errno = ESOCKTNOSUPPORT; + return -1; + } + + prt = ntohs(in->sin_port); + if (a_type && addr == 0xFFFFFFFF) { + /* 255.255.255.255 only udp */ + is_bcast = 2; + type = a_type; + iface = socket_wrapper_default_iface(); + } else if (b_type && addr == sw_bcast_addr) { + /* + * 127.255.255.255 + * or + * 10.255.255.255 + * only udp + */ + is_bcast = 1; + type = b_type; + iface = socket_wrapper_default_iface(); + } else if ((addr & 0xFFFFFF00) == sw_net_addr) { + /* 127.0.0.X or 10.53.57.X */ + is_bcast = 0; + type = u_type; + iface = (addr & 0x000000FF); + } else { + char str[256] = {0,}; + inet_ntop(inaddr->sa_family, + &in->sin_addr, + str, sizeof(str)); + SWRAP_LOG(SWRAP_LOG_WARN, + "str[%s] prt[%u]", + str, (unsigned)prt); + errno = ENETUNREACH; + return -1; + } + if (bcast) *bcast = is_bcast; + break; + } +#ifdef HAVE_IPV6 + case AF_INET6: { + const struct sockaddr_in6 *in = + (const struct sockaddr_in6 *)(const void *)inaddr; + struct in6_addr cmp1, cmp2; + + switch (si->type) { + case SOCK_STREAM: + type = SOCKET_TYPE_CHAR_TCP_V6; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP_V6; + break; + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!"); + errno = ESOCKTNOSUPPORT; + return -1; + } + + /* XXX no multicast/broadcast */ + + prt = ntohs(in->sin6_port); + + cmp1 = *swrap_ipv6(); + cmp2 = in->sin6_addr; + cmp2.s6_addr[15] = 0; + if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) { + iface = in->sin6_addr.s6_addr[15]; + } else { + char str[256] = {0,}; + inet_ntop(inaddr->sa_family, + &in->sin6_addr, + str, sizeof(str)); + SWRAP_LOG(SWRAP_LOG_WARN, + "str[%s] prt[%u]", + str, (unsigned)prt); + errno = ENETUNREACH; + return -1; + } + + break; + } +#endif + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family!"); + errno = ENETUNREACH; + return -1; + } + + if (prt == 0) { + SWRAP_LOG(SWRAP_LOG_WARN, "Port not set"); + errno = EINVAL; + return -1; + } + + swrap_dir = socket_wrapper_dir(); + if (swrap_dir == NULL) { + errno = EINVAL; + return -1; + } + + if (is_bcast) { + swrap_un_path_EINVAL(un, swrap_dir); + SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path); + SAFE_FREE(swrap_dir); + /* the caller need to do more processing */ + return 0; + } + + swrap_un_path(un, swrap_dir, type, iface, prt); + SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path); + + SAFE_FREE(swrap_dir); + + return 0; +} + +static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un, + int *bcast) +{ + char type = '\0'; + unsigned int prt; + unsigned int iface; + struct stat st; + int is_bcast = 0; + char *swrap_dir = NULL; + + 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'; + const unsigned int sw_net_addr = swrap_ipv4_net(); + const unsigned int sw_bcast_addr = swrap_ipv4_bcast(); + + prt = ntohs(in->sin_port); + + switch (si->type) { + case SOCK_STREAM: + u_type = SOCKET_TYPE_CHAR_TCP; + d_type = SOCKET_TYPE_CHAR_TCP; + break; + case SOCK_DGRAM: + u_type = SOCKET_TYPE_CHAR_UDP; + d_type = SOCKET_TYPE_CHAR_UDP; + a_type = SOCKET_TYPE_CHAR_UDP; + b_type = SOCKET_TYPE_CHAR_UDP; + break; + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!"); + errno = ESOCKTNOSUPPORT; + return -1; + } + + if (addr == 0) { + /* 0.0.0.0 */ + is_bcast = 0; + type = d_type; + iface = socket_wrapper_default_iface(); + } else if (a_type && addr == 0xFFFFFFFF) { + /* 255.255.255.255 only udp */ + is_bcast = 2; + type = a_type; + iface = socket_wrapper_default_iface(); + } else if (b_type && addr == sw_bcast_addr) { + /* 127.255.255.255 only udp */ + is_bcast = 1; + type = b_type; + iface = socket_wrapper_default_iface(); + } else if ((addr & 0xFFFFFF00) == sw_net_addr) { + /* 127.0.0.X */ + is_bcast = 0; + type = u_type; + iface = (addr & 0x000000FF); + } else { + errno = EADDRNOTAVAIL; + return -1; + } + + /* Store the bind address for connect() */ + if (si->bindname.sa_socklen == 0) { + struct sockaddr_in bind_in; + socklen_t blen = sizeof(struct sockaddr_in); + + ZERO_STRUCT(bind_in); + bind_in.sin_family = in->sin_family; + bind_in.sin_port = in->sin_port; + bind_in.sin_addr.s_addr = htonl(swrap_ipv4_iface(iface)); + si->bindname.sa_socklen = blen; + memcpy(&si->bindname.sa.in, &bind_in, blen); + } + + break; + } +#ifdef HAVE_IPV6 + case AF_INET6: { + const struct sockaddr_in6 *in = + (const struct sockaddr_in6 *)(const void *)inaddr; + struct in6_addr cmp1, cmp2; + + switch (si->type) { + case SOCK_STREAM: + type = SOCKET_TYPE_CHAR_TCP_V6; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP_V6; + break; + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!"); + errno = ESOCKTNOSUPPORT; + return -1; + } + + /* XXX no multicast/broadcast */ + + prt = ntohs(in->sin6_port); + + cmp1 = *swrap_ipv6(); + cmp2 = in->sin6_addr; + cmp2.s6_addr[15] = 0; + if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) { + iface = socket_wrapper_default_iface(); + } else if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) { + iface = in->sin6_addr.s6_addr[15]; + } else { + errno = EADDRNOTAVAIL; + return -1; + } + + /* Store the bind address for connect() */ + if (si->bindname.sa_socklen == 0) { + struct sockaddr_in6 bind_in; + socklen_t blen = sizeof(struct sockaddr_in6); + + ZERO_STRUCT(bind_in); + bind_in.sin6_family = in->sin6_family; + bind_in.sin6_port = in->sin6_port; + + bind_in.sin6_addr = *swrap_ipv6(); + bind_in.sin6_addr.s6_addr[15] = iface; + + memcpy(&si->bindname.sa.in6, &bind_in, blen); + si->bindname.sa_socklen = blen; + } + + break; + } +#endif + default: + SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family"); + errno = EADDRNOTAVAIL; + return -1; + } + + + if (bcast) *bcast = is_bcast; + + if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) { + errno = EINVAL; + return -1; + } + + swrap_dir = socket_wrapper_dir(); + if (swrap_dir == NULL) { + errno = EINVAL; + return -1; + } + + if (prt == 0) { + /* handle auto-allocation of ephemeral ports */ + for (prt = 5001; prt < 10000; prt++) { + swrap_un_path(un, swrap_dir, type, iface, prt); + if (stat(un->sun_path, &st) == 0) continue; + + set_port(si->family, prt, &si->myname); + set_port(si->family, prt, &si->bindname); + + break; + } + + if (prt == 10000) { + errno = ENFILE; + SAFE_FREE(swrap_dir); + return -1; + } + } + + swrap_un_path(un, swrap_dir, type, iface, prt); + SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path); + + SAFE_FREE(swrap_dir); + + return 0; +} + +static struct socket_info *find_socket_info(int fd) +{ + int idx = find_socket_info_index(fd); + + if (idx == -1) { + return NULL; + } + + return swrap_get_socket_info(idx); +} + +#if 0 /* FIXME */ +static bool check_addr_port_in_use(const struct sockaddr *sa, socklen_t len) +{ + struct socket_info_fd *f; + const struct socket_info *last_s = NULL; + + /* first catch invalid input */ + switch (sa->sa_family) { + case AF_INET: + if (len < sizeof(struct sockaddr_in)) { + return false; + } + break; +#ifdef HAVE_IPV6 + case AF_INET6: + if (len < sizeof(struct sockaddr_in6)) { + return false; + } + break; +#endif + default: + return false; + break; + } + + for (f = socket_fds; f; f = f->next) { + struct socket_info *s = swrap_get_socket_info(f->si_index); + + if (s == last_s) { + continue; + } + last_s = s; + + 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; + } +#ifdef 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); + +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!"); + 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"); + 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!"); + 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"); + errno = EAFNOSUPPORT; + return -1; +} + +enum swrap_packet_type { + SWRAP_CONNECT_SEND, + SWRAP_CONNECT_UNREACH, + SWRAP_CONNECT_RECV, + SWRAP_CONNECT_ACK, + SWRAP_ACCEPT_SEND, + SWRAP_ACCEPT_RECV, + SWRAP_ACCEPT_ACK, + SWRAP_RECVFROM, + SWRAP_SENDTO, + SWRAP_SENDTO_UNREACH, + SWRAP_PENDING_RST, + SWRAP_RECV, + SWRAP_RECV_RST, + SWRAP_SEND, + SWRAP_SEND_RST, + SWRAP_CLOSE_SEND, + SWRAP_CLOSE_RECV, + SWRAP_CLOSE_ACK, +}; + +struct swrap_file_hdr { + uint32_t magic; + uint16_t version_major; + uint16_t version_minor; + int32_t timezone; + uint32_t sigfigs; + uint32_t frame_max_len; +#define SWRAP_FRAME_LENGTH_MAX 0xFFFF + uint32_t link_type; +}; +#define SWRAP_FILE_HDR_SIZE 24 + +struct swrap_packet_frame { + uint32_t seconds; + uint32_t micro_seconds; + uint32_t recorded_length; + uint32_t full_length; +}; +#define SWRAP_PACKET_FRAME_SIZE 16 + +union swrap_packet_ip { + struct { + uint8_t ver_hdrlen; + uint8_t tos; + uint16_t packet_length; + uint16_t identification; + uint8_t flags; + uint8_t fragment; + uint8_t ttl; + uint8_t protocol; + uint16_t hdr_checksum; + uint32_t src_addr; + uint32_t dest_addr; + } v4; +#define SWRAP_PACKET_IP_V4_SIZE 20 + struct { + uint8_t ver_prio; + uint8_t flow_label_high; + uint16_t flow_label_low; + uint16_t payload_length; + uint8_t next_header; + uint8_t hop_limit; + uint8_t src_addr[16]; + uint8_t dest_addr[16]; + } v6; +#define SWRAP_PACKET_IP_V6_SIZE 40 +}; +#define SWRAP_PACKET_IP_SIZE 40 + +union swrap_packet_payload { + struct { + uint16_t source_port; + uint16_t dest_port; + uint32_t seq_num; + uint32_t ack_num; + uint8_t hdr_length; + uint8_t control; + uint16_t window; + uint16_t checksum; + uint16_t urg; + } tcp; +#define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20 + struct { + uint16_t source_port; + uint16_t dest_port; + uint16_t length; + uint16_t checksum; + } udp; +#define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8 + struct { + uint8_t type; + uint8_t code; + uint16_t checksum; + uint32_t unused; + } icmp4; +#define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8 + struct { + uint8_t type; + uint8_t code; + uint16_t checksum; + uint32_t unused; + } icmp6; +#define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8 +}; +#define SWRAP_PACKET_PAYLOAD_SIZE 20 + +#define SWRAP_PACKET_MIN_ALLOC \ + (SWRAP_PACKET_FRAME_SIZE + \ + SWRAP_PACKET_IP_SIZE + \ + SWRAP_PACKET_PAYLOAD_SIZE) + +static const char *swrap_pcap_init_file(void) +{ + static int initialized = 0; + static const char *s = NULL; + static const struct swrap_file_hdr h; + static const struct swrap_packet_frame f; + static const union swrap_packet_ip i; + static const union swrap_packet_payload p; + + if (initialized == 1) { + return s; + } + initialized = 1; + + /* + * TODO: don't use the structs use plain buffer offsets + * and PUSH_U8(), PUSH_U16() and PUSH_U32() + * + * for now make sure we disable PCAP support + * if the struct has alignment! + */ + if (sizeof(h) != SWRAP_FILE_HDR_SIZE) { + return NULL; + } + if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) { + return NULL; + } + if (sizeof(i) != SWRAP_PACKET_IP_SIZE) { + return NULL; + } + if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) { + return NULL; + } + if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) { + return NULL; + } + if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) { + return NULL; + } + if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) { + return NULL; + } + if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) { + return NULL; + } + if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) { + return NULL; + } + if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) { + return NULL; + } + + s = getenv("SOCKET_WRAPPER_PCAP_FILE"); + if (s == NULL) { + return NULL; + } + if (strncmp(s, "./", 2) == 0) { + s += 2; + } + SWRAP_LOG(SWRAP_LOG_TRACE, "SOCKET_WRAPPER_PCAP_FILE: %s", s); + 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 = NULL; + uint8_t *buf = NULL; + union { + uint8_t *ptr; + struct swrap_packet_frame *frame; + } f; + union { + uint8_t *ptr; + union swrap_packet_ip *ip; + } i; + union swrap_packet_payload *pay; + size_t packet_len; + size_t alloc_len; + size_t nonwire_len = sizeof(struct swrap_packet_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(i.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(i.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_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; + f.ptr = buf; + + f.frame->seconds = tval->tv_sec; + f.frame->micro_seconds = tval->tv_usec; + f.frame->recorded_length = wire_len - icmp_truncate_len; + f.frame->full_length = wire_len - icmp_truncate_len; + + buf += SWRAP_PACKET_FRAME_SIZE; + + i.ptr = buf; + switch (src->sa_family) { + case AF_INET: + if (src_in == NULL || dest_in == NULL) { + SAFE_FREE(base); + return NULL; + } + + i.ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */ + i.ip->v4.tos = 0x00; + i.ip->v4.packet_length = htons(wire_len - icmp_truncate_len); + i.ip->v4.identification = htons(0xFFFF); + i.ip->v4.flags = 0x40; /* BIT 1 set - means don't fragment */ + i.ip->v4.fragment = htons(0x0000); + i.ip->v4.ttl = 0xFF; + i.ip->v4.protocol = protocol; + i.ip->v4.hdr_checksum = htons(0x0000); + i.ip->v4.src_addr = src_in->sin_addr.s_addr; + i.ip->v4.dest_addr = dest_in->sin_addr.s_addr; + buf += SWRAP_PACKET_IP_V4_SIZE; + break; +#ifdef HAVE_IPV6 + case AF_INET6: + if (src_in6 == NULL || dest_in6 == NULL) { + SAFE_FREE(base); + return NULL; + } + + i.ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */ + i.ip->v6.flow_label_high = 0x00; + i.ip->v6.flow_label_low = 0x0000; + i.ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */ + i.ip->v6.next_header = protocol; + memcpy(i.ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16); + memcpy(i.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 */ + i.ptr = buf; + i.ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */ + i.ip->v4.tos = 0x00; + i.ip->v4.packet_length = htons(wire_len - icmp_hdr_len); + i.ip->v4.identification = htons(0xFFFF); + i.ip->v4.flags = 0x40; /* BIT 1 set - means don't fragment */ + i.ip->v4.fragment = htons(0x0000); + i.ip->v4.ttl = 0xFF; + i.ip->v4.protocol = icmp_protocol; + i.ip->v4.hdr_checksum = htons(0x0000); + i.ip->v4.src_addr = dest_in->sin_addr.s_addr; + i.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 */ + i.ptr = buf; + i.ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */ + i.ip->v6.flow_label_high = 0x00; + i.ip->v6.flow_label_low = 0x0000; + i.ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */ + i.ip->v6.next_header = protocol; + memcpy(i.ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16); + memcpy(i.ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16); + + buf += SWRAP_PACKET_IP_V6_SIZE; + + src_port = dest_in6->sin6_port; + dest_port = src_in6->sin6_port; + break; +#endif + } + } + + pay = (union swrap_packet_payload *)(void *)buf; + + switch (socket_type) { + case SOCK_STREAM: + pay->tcp.source_port = src_port; + pay->tcp.dest_port = dest_port; + pay->tcp.seq_num = htonl(tcp_seqno); + pay->tcp.ack_num = htonl(tcp_ack); + pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */ + pay->tcp.control = tcp_ctl; + pay->tcp.window = htons(0x7FFF); + pay->tcp.checksum = htons(0x0000); + pay->tcp.urg = htons(0x0000); + buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE; + + break; + + case SOCK_DGRAM: + pay->udp.source_port = src_port; + pay->udp.dest_port = dest_port; + pay->udp.length = htons(8 + payload_len); + pay->udp.checksum = htons(0x0000); + buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE; + + break; + } + + if (payload && payload_len > 0) { + memcpy(buf, payload, payload_len); + } + + *_packet_len = packet_len - icmp_truncate_len; + return base; +} + +static int swrap_pcap_get_fd(const char *fname) +{ + static int fd = -1; + + if (fd != -1) { + return fd; + } + + fd = libc_open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644); + if (fd != -1) { + struct swrap_file_hdr file_hdr; + file_hdr.magic = 0xA1B2C3D4; + file_hdr.version_major = 0x0002; + file_hdr.version_minor = 0x0004; + file_hdr.timezone = 0x00000000; + file_hdr.sigfigs = 0x00000000; + file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX; + file_hdr.link_type = 0x0065; /* 101 RAW IP */ + + if (libc_write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) { + libc_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; + + swrap_mutex_lock(&pcap_dump_mutex); + + file_name = swrap_pcap_init_file(); + if (!file_name) { + goto done; + } + + packet = swrap_pcap_marshall_packet(si, + addr, + type, + buf, + len, + &packet_len); + if (packet == NULL) { + goto done; + } + + fd = swrap_pcap_get_fd(file_name); + if (fd != -1) { + if (libc_write(fd, packet, packet_len) != (ssize_t)packet_len) { + free(packet); + goto done; + } + } + + free(packet); + +done: + swrap_mutex_unlock(&pcap_dump_mutex); +} + +/**************************************************************************** + * 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 = NULL; + struct socket_info _si = { 0 }; + int fd; + int ret; + 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: + fd = libc_socket(family, type, protocol); + if (fd != -1) { + /* Check if we have a stale fd and remove it */ + swrap_remove_stale(fd); + SWRAP_LOG(SWRAP_LOG_TRACE, + "Unix socket fd=%d", + fd); + } + return fd; + 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 */ + swrap_remove_stale(fd); + + si = &_si; + 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; + } +#ifdef HAVE_IPV6 + 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; + } +#endif + default: + errno = EINVAL; + return -1; + } + + ret = swrap_create_socket(si, fd); + if (ret == -1) { + int saved_errno = errno; + libc_close(fd); + errno = saved_errno; + return -1; + } + + SWRAP_LOG(SWRAP_LOG_TRACE, + "Created %s socket for protocol %s, fd=%d", + family == AF_INET ? "IPv4" : "IPv6", + real_type == SOCK_DGRAM ? "UDP" : "TCP", + fd); + + 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 new_si = { 0 }; + int fd; + int idx; + 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 + UNUSED(flags); + return libc_accept(s, addr, addrlen); +#endif + } + + + /* + * prevent parent_si from being altered / closed + * while we read it + */ + SWRAP_LOCK_SI(parent_si); + + /* + * 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) { + SWRAP_UNLOCK_SI(parent_si); + errno = EINVAL; + return -1; + } + + SWRAP_UNLOCK_SI(parent_si); + +#ifdef HAVE_ACCEPT4 + ret = libc_accept4(s, &un_addr.sa.s, &un_addr.sa_socklen, flags); +#else + UNUSED(flags); + ret = libc_accept(s, &un_addr.sa.s, &un_addr.sa_socklen); +#endif + if (ret == -1) { + int saved_errno = errno; + if (saved_errno == ENOTSOCK) { + /* Remove stale fds */ + swrap_remove_stale(s); + } + errno = saved_errno; + return ret; + } + + fd = ret; + + /* Check if we have a stale fd and remove it */ + swrap_remove_stale(fd); + + if (un_addr.sa.un.sun_path[0] == '\0') { + /* + * FreeBSD seems to have a problem where + * accept4() on the unix socket doesn't + * ECONNABORTED for already disconnected connections. + * + * Let's try libc_getpeername() to get the peer address + * as a fallback, but it'll likely return ENOTCONN, + * which we have to map to ECONNABORTED. + */ + un_addr.sa_socklen = sizeof(struct sockaddr_un), + ret = libc_getpeername(fd, &un_addr.sa.s, &un_addr.sa_socklen); + if (ret == -1) { + int saved_errno = errno; + libc_close(fd); + if (saved_errno == ENOTCONN) { + /* + * If the connection is already disconnected + * we should return ECONNABORTED. + */ + saved_errno = ECONNABORTED; + } + errno = saved_errno; + return ret; + } + } + + ret = libc_getsockname(fd, + &un_my_addr.sa.s, + &un_my_addr.sa_socklen); + if (ret == -1) { + int saved_errno = errno; + libc_close(fd); + if (saved_errno == ENOTCONN) { + /* + * If the connection is already disconnected + * we should return ECONNABORTED. + */ + saved_errno = ECONNABORTED; + } + errno = saved_errno; + return ret; + } + + SWRAP_LOCK_SI(parent_si); + + 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) { + int saved_errno = errno; + SWRAP_UNLOCK_SI(parent_si); + libc_close(fd); + errno = saved_errno; + return ret; + } + + child_si = &new_si; + + 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; + + SWRAP_UNLOCK_SI(parent_si); + + 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 = 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) { + int saved_errno = errno; + libc_close(fd); + errno = saved_errno; + 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); + + idx = swrap_create_socket(&new_si, fd); + if (idx == -1) { + int saved_errno = errno; + libc_close(fd); + errno = saved_errno; + return -1; + } + + if (addr != NULL) { + struct socket_info *si = swrap_get_socket_info(idx); + + SWRAP_LOCK_SI(si); + swrap_pcap_dump_packet(si, addr, SWRAP_ACCEPT_SEND, NULL, 0); + swrap_pcap_dump_packet(si, addr, SWRAP_ACCEPT_RECV, NULL, 0); + swrap_pcap_dump_packet(si, addr, SWRAP_ACCEPT_ACK, NULL, 0); + SWRAP_UNLOCK_SI(si); + } + + 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; + char *swrap_dir = NULL; + + swrap_mutex_lock(&autobind_start_mutex); + + if (autobind_start_init != 1) { + autobind_start_init = 1; + autobind_start = getpid(); + autobind_start %= 50000; + autobind_start += 10000; + } + + un_addr.sa.un.sun_family = AF_UNIX; + + switch (family) { + case AF_INET: { + struct sockaddr_in in; + + switch (si->type) { + case SOCK_STREAM: + type = SOCKET_TYPE_CHAR_TCP; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP; + break; + default: + errno = ESOCKTNOSUPPORT; + ret = -1; + goto done; + } + + memset(&in, 0, sizeof(in)); + in.sin_family = AF_INET; + in.sin_addr.s_addr = htonl(swrap_ipv4_iface( + socket_wrapper_default_iface())); + + si->myname = (struct swrap_address) { + .sa_socklen = sizeof(in), + }; + memcpy(&si->myname.sa.in, &in, si->myname.sa_socklen); + break; + } +#ifdef HAVE_IPV6 + case AF_INET6: { + struct sockaddr_in6 in6; + + if (si->family != family) { + errno = ENETUNREACH; + ret = -1; + goto done; + } + + switch (si->type) { + case SOCK_STREAM: + type = SOCKET_TYPE_CHAR_TCP_V6; + break; + case SOCK_DGRAM: + type = SOCKET_TYPE_CHAR_UDP_V6; + break; + default: + errno = ESOCKTNOSUPPORT; + ret = -1; + goto done; + } + + memset(&in6, 0, sizeof(in6)); + in6.sin6_family = AF_INET6; + in6.sin6_addr = *swrap_ipv6(); + in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface(); + + si->myname = (struct swrap_address) { + .sa_socklen = sizeof(in6), + }; + memcpy(&si->myname.sa.in6, &in6, si->myname.sa_socklen); + break; + } +#endif + default: + errno = ESOCKTNOSUPPORT; + ret = -1; + goto done; + } + + if (autobind_start > 60000) { + autobind_start = 10000; + } + + swrap_dir = socket_wrapper_dir(); + if (swrap_dir == NULL) { + errno = EINVAL; + ret = -1; + goto done; + } + + for (i = 0; i < SOCKET_MAX_SOCKETS; i++) { + port = autobind_start + i; + swrap_un_path(&un_addr.sa.un, + swrap_dir, + type, + socket_wrapper_default_iface(), + port); + + ret = libc_bind(fd, &un_addr.sa.s, un_addr.sa_socklen); + if (ret == -1) { + if (errno == EALREADY || errno == EADDRINUSE) { + continue; + } + goto done; + } + + si->un_addr = un_addr.sa.un; + + si->bound = 1; + autobind_start = port + 1; + break; + } + if (i == SOCKET_MAX_SOCKETS) { + SWRAP_LOG(SWRAP_LOG_ERROR, "Too many open unix sockets (%u) for " + "interface "SOCKET_FORMAT, + SOCKET_MAX_SOCKETS, + type, + socket_wrapper_default_iface(), + 0); + errno = ENFILE; + ret = -1; + goto done; + } + + si->family = family; + set_port(si->family, port, &si->myname); + + ret = 0; + +done: + SAFE_FREE(swrap_dir); + swrap_mutex_unlock(&autobind_start_mutex); + return ret; +} + +/**************************************************************************** + * 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); + } + + SWRAP_LOCK_SI(si); + + if (si->bound == 0) { + ret = swrap_auto_bind(s, si, serv_addr->sa_family); + if (ret == -1) { + goto done; + } + } + + if (si->family != serv_addr->sa_family) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "called for fd=%d (family=%d) called with invalid family=%d", + s, si->family, serv_addr->sa_family); + errno = EINVAL; + ret = -1; + goto done; + } + + ret = sockaddr_convert_to_un(si, serv_addr, + addrlen, &un_addr.sa.un, 0, &bcast); + if (ret == -1) { + goto done; + } + + if (bcast) { + errno = ENETUNREACH; + ret = -1; + goto done; + } + + 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); + } + +done: + SWRAP_UNLOCK_SI(si); + 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); + } + + SWRAP_LOCK_SI(si); + + 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; + ret = -1; + goto out; + } + +#if 0 /* FIXME */ + in_use = check_addr_port_in_use(myaddr, addrlen); + if (in_use) { + errno = EADDRINUSE; + ret = -1; + goto out; + } +#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) { + goto out; + } + + 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; + } + +out: + SWRAP_UNLOCK_SI(si); + + 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); + } + + SWRAP_LOCK_SI(si); + + if (si->bound == 0) { + ret = swrap_auto_bind(s, si, si->family); + if (ret == -1) { + errno = EADDRINUSE; + goto out; + } + } + + ret = libc_listen(s, backlog); + if (ret == 0) { + si->listening = 1; + } + +out: + SWRAP_UNLOCK_SI(si); + + 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); +} + +/**************************************************************************** + * FOPEN64 + ***************************************************************************/ + +#ifdef HAVE_FOPEN64 +static FILE *swrap_fopen64(const char *name, const char *mode) +{ + FILE *fp; + + fp = libc_fopen64(name, mode); + if (fp != NULL) { + int fd = fileno(fp); + + swrap_remove_stale(fd); + } + + return fp; +} + +FILE *fopen64(const char *name, const char *mode) +{ + return swrap_fopen64(name, mode); +} +#endif /* HAVE_FOPEN64 */ + +/**************************************************************************** + * 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; +} + +/**************************************************************************** + * OPEN64 + ***************************************************************************/ + +#ifdef HAVE_OPEN64 +static int swrap_vopen64(const char *pathname, int flags, va_list ap) +{ + int ret; + + ret = libc_vopen64(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 open64(const char *pathname, int flags, ...) +{ + va_list ap; + int fd; + + va_start(ap, flags); + fd = swrap_vopen64(pathname, flags, ap); + va_end(ap); + + return fd; +} +#endif /* HAVE_OPEN64 */ + +/**************************************************************************** + * OPENAT + ***************************************************************************/ + +static int swrap_vopenat(int dirfd, const char *path, int flags, va_list ap) +{ + int ret; + + ret = libc_vopenat(dirfd, path, 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 openat(int dirfd, const char *path, int flags, ...) +{ + va_list ap; + int fd; + + va_start(ap, flags); + fd = swrap_vopenat(dirfd, path, 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; + int ret = -1; + + if (!si) { + return libc_getpeername(s, name, addrlen); + } + + SWRAP_LOCK_SI(si); + + if (si->peername.sa_socklen == 0) + { + errno = ENOTCONN; + goto out; + } + + len = MIN(*addrlen, si->peername.sa_socklen); + if (len == 0) { + ret = 0; + goto out; + } + + memcpy(name, &si->peername.sa.ss, len); + *addrlen = si->peername.sa_socklen; + + ret = 0; +out: + SWRAP_UNLOCK_SI(si); + + return ret; +} + +#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; + int ret = -1; + + if (!si) { + return libc_getsockname(s, name, addrlen); + } + + SWRAP_LOCK_SI(si); + + len = MIN(*addrlen, si->myname.sa_socklen); + if (len == 0) { + ret = 0; + goto out; + } + + memcpy(name, &si->myname.sa.ss, len); + *addrlen = si->myname.sa_socklen; + + ret = 0; +out: + SWRAP_UNLOCK_SI(si); + + return ret; +} + +#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); + int ret; + + if (!si) { + return libc_getsockopt(s, + level, + optname, + optval, + optlen); + } + + SWRAP_LOCK_SI(si); + + if (level == SOL_SOCKET) { + switch (optname) { +#ifdef SO_DOMAIN + case SO_DOMAIN: + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + ret = -1; + goto done; + } + + *optlen = sizeof(int); + *(int *)optval = si->family; + ret = 0; + goto done; +#endif /* SO_DOMAIN */ + +#ifdef SO_PROTOCOL + case SO_PROTOCOL: + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + ret = -1; + goto done; + } + + *optlen = sizeof(int); + *(int *)optval = si->protocol; + ret = 0; + goto done; +#endif /* SO_PROTOCOL */ + case SO_TYPE: + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)sizeof(int)) { + errno = EINVAL; + ret = -1; + goto done; + } + + *optlen = sizeof(int); + *(int *)optval = si->type; + ret = 0; + goto done; + default: + ret = libc_getsockopt(s, + level, + optname, + optval, + optlen); + goto done; + } + } 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; + ret = -1; + goto done; + } + + *optlen = sizeof(int); + *(int *)optval = si->tcp_nodelay; + + ret = 0; + goto done; +#endif /* TCP_NODELAY */ +#ifdef TCP_INFO + case TCP_INFO: { + struct tcp_info info; + socklen_t ilen = sizeof(info); + +#ifdef HAVE_NETINET_TCP_FSM_H +/* This is FreeBSD */ +# define __TCP_LISTEN TCPS_LISTEN +# define __TCP_ESTABLISHED TCPS_ESTABLISHED +# define __TCP_CLOSE TCPS_CLOSED +#else +/* This is Linux */ +# define __TCP_LISTEN TCP_LISTEN +# define __TCP_ESTABLISHED TCP_ESTABLISHED +# define __TCP_CLOSE TCP_CLOSE +#endif + + ZERO_STRUCT(info); + if (si->listening) { + info.tcpi_state = __TCP_LISTEN; + } else if (si->connected) { + /* + * For now we just fake a few values + * supported both by FreeBSD and Linux + */ + info.tcpi_state = __TCP_ESTABLISHED; + info.tcpi_rto = 200000; /* 200 msec */ + info.tcpi_rtt = 5000; /* 5 msec */ + info.tcpi_rttvar = 5000; /* 5 msec */ + } else { + info.tcpi_state = __TCP_CLOSE; + info.tcpi_rto = 1000000; /* 1 sec */ + info.tcpi_rtt = 0; + info.tcpi_rttvar = 250000; /* 250 msec */ + } + + if (optval == NULL || optlen == NULL || + *optlen < (socklen_t)ilen) { + errno = EINVAL; + ret = -1; + goto done; + } + + *optlen = ilen; + memcpy(optval, &info, ilen); + + ret = 0; + goto done; + } +#endif /* TCP_INFO */ + default: + break; + } + } + + errno = ENOPROTOOPT; + ret = -1; + +done: + SWRAP_UNLOCK_SI(si); + return ret; +} + +#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); + int ret; + + if (!si) { + return libc_setsockopt(s, + level, + optname, + optval, + optlen); + } + + if (level == SOL_SOCKET) { + return libc_setsockopt(s, + level, + optname, + optval, + optlen); + } + + SWRAP_LOCK_SI(si); + + 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; + ret = -1; + goto done; + } + + i = *discard_const_p(int, optval); + if (i != 0 && i != 1) { + errno = EINVAL; + ret = -1; + goto done; + } + si->tcp_nodelay = i; + + ret = 0; + goto done; + } +#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 */ + } + ret = 0; + goto done; +#ifdef HAVE_IPV6 + case AF_INET6: + if (level == IPPROTO_IPV6) { +#ifdef IPV6_RECVPKTINFO + if (optname == IPV6_RECVPKTINFO) { + si->pktinfo = AF_INET6; + } +#endif /* IPV6_PKTINFO */ + } + ret = 0; + goto done; +#endif + default: + errno = ENOPROTOOPT; + ret = -1; + goto done; + } + +done: + SWRAP_UNLOCK_SI(si); + return ret; +} + +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_ptr = NULL; + int rc; + + if (!si) { + return libc_vioctl(s, r, va); + } + + SWRAP_LOCK_SI(si); + + va_copy(ap, va); + + rc = libc_vioctl(s, r, va); + + switch (r) { + case FIONREAD: + if (rc == 0) { + value_ptr = ((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_ptr != NULL && *value_ptr == 0) { /* END OF FILE */ + swrap_pcap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0); + } + break; +#ifdef FIONWRITE + case FIONWRITE: + /* this is FreeBSD */ + FALL_THROUGH; /* to TIOCOUTQ */ +#endif /* FIONWRITE */ + case TIOCOUTQ: /* same as SIOCOUTQ on Linux */ + /* + * This may return more bytes then the application + * sent into the socket, for tcp it should + * return the number of unacked bytes. + * + * On AF_UNIX, all bytes are immediately acked! + */ + if (rc == 0) { + value_ptr = ((int *)va_arg(ap, int *)); + *value_ptr = 0; + } + break; + } + + va_end(ap); + + SWRAP_UNLOCK_SI(si); + 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(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space); +static int swrap_sendmsg_filter_cmsg_ipproto_ip(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space); +static int swrap_sendmsg_filter_cmsg_sol_socket(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space); + +static int swrap_sendmsg_filter_cmsghdr(const struct msghdr *_msg, + uint8_t **cm_data, + size_t *cm_data_space) +{ + struct msghdr *msg = discard_const_p(struct msghdr, _msg); + 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_ipproto_ip(cmsg, + cm_data, + cm_data_space); + break; + case SOL_SOCKET: + rc = swrap_sendmsg_filter_cmsg_sol_socket(cmsg, + cm_data, + cm_data_space); + break; + default: + rc = swrap_sendmsg_copy_cmsg(cmsg, + cm_data, + cm_data_space); + break; + } + if (rc < 0) { + int saved_errno = errno; + SAFE_FREE(*cm_data); + *cm_data_space = 0; + errno = saved_errno; + return rc; + } + } + + return rc; +} + +static int swrap_sendmsg_copy_cmsg(const 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(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space); + + +static int swrap_sendmsg_filter_cmsg_ipproto_ip(const 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(const 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; +} + +static int swrap_sendmsg_filter_cmsg_sol_socket(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space) +{ + int rc = -1; + + switch (cmsg->cmsg_type) { + case SCM_RIGHTS: + SWRAP_LOG(SWRAP_LOG_TRACE, + "Ignoring SCM_RIGHTS on inet socket!"); + rc = 0; + break; +#ifdef SCM_CREDENTIALS + case SCM_CREDENTIALS: + SWRAP_LOG(SWRAP_LOG_TRACE, + "Ignoring SCM_CREDENTIALS on inet socket!"); + rc = 0; + break; +#endif /* SCM_CREDENTIALS */ + default: + rc = swrap_sendmsg_copy_cmsg(cmsg, + cm_data, + cm_data_space); + break; + } + + return rc; +} + +static const uint64_t swrap_unix_scm_right_magic = 0x8e0e13f27c42fc36; + +/* + * We only allow up to 6 fds at a time + * as that's more than enough for Samba + * and it means we can keep the logic simple + * and work with fixed size arrays. + * + * We also keep sizeof(struct swrap_unix_scm_rights) + * under PIPE_BUF (4096) in order to allow a non-blocking + * write into the pipe. + */ +#ifndef PIPE_BUF +#define PIPE_BUF 4096 +#endif +#define SWRAP_MAX_PASSED_FDS ((size_t)6) +#define SWRAP_MAX_PASSED_SOCKET_INFO SWRAP_MAX_PASSED_FDS +struct swrap_unix_scm_rights_payload { + uint8_t num_idxs; + int8_t idxs[SWRAP_MAX_PASSED_FDS]; + struct socket_info infos[SWRAP_MAX_PASSED_SOCKET_INFO]; +}; +struct swrap_unix_scm_rights { + uint64_t magic; + char package_name[sizeof(SOCKET_WRAPPER_PACKAGE)]; + char package_version[sizeof(SOCKET_WRAPPER_VERSION)]; + uint32_t full_size; + uint32_t payload_size; + struct swrap_unix_scm_rights_payload payload; +}; + +static void swrap_dec_fd_passed_array(size_t num, struct socket_info **array) +{ + int saved_errno = errno; + size_t i; + + for (i = 0; i < num; i++) { + struct socket_info *si = array[i]; + if (si == NULL) { + continue; + } + + SWRAP_LOCK_SI(si); + swrap_dec_refcount(si); + if (si->fd_passed > 0) { + si->fd_passed -= 1; + } + SWRAP_UNLOCK_SI(si); + array[i] = NULL; + } + + errno = saved_errno; +} + +static void swrap_undo_si_idx_array(size_t num, int *array) +{ + int saved_errno = errno; + size_t i; + + swrap_mutex_lock(&first_free_mutex); + + for (i = 0; i < num; i++) { + struct socket_info *si = NULL; + + if (array[i] == -1) { + continue; + } + + si = swrap_get_socket_info(array[i]); + if (si == NULL) { + continue; + } + + SWRAP_LOCK_SI(si); + swrap_dec_refcount(si); + SWRAP_UNLOCK_SI(si); + + swrap_set_next_free(si, first_free); + first_free = array[i]; + array[i] = -1; + } + + swrap_mutex_unlock(&first_free_mutex); + errno = saved_errno; +} + +static void swrap_close_fd_array(size_t num, const int *array) +{ + int saved_errno = errno; + size_t i; + + for (i = 0; i < num; i++) { + if (array[i] == -1) { + continue; + } + libc_close(array[i]); + } + + errno = saved_errno; +} + +union __swrap_fds { + const uint8_t *p; + int *fds; +}; + +union __swrap_cmsghdr { + const uint8_t *p; + struct cmsghdr *cmsg; +}; + +static int swrap_sendmsg_unix_scm_rights(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space, + int *scm_rights_pipe_fd) +{ + struct swrap_unix_scm_rights info; + struct swrap_unix_scm_rights_payload *payload = NULL; + int si_idx_array[SWRAP_MAX_PASSED_FDS]; + struct socket_info *si_array[SWRAP_MAX_PASSED_FDS] = { NULL, }; + size_t info_idx = 0; + size_t size_fds_in; + size_t num_fds_in; + union __swrap_fds __fds_in = { .p = NULL, }; + const int *fds_in = NULL; + size_t num_fds_out; + size_t size_fds_out; + union __swrap_fds __fds_out = { .p = NULL, }; + int *fds_out = NULL; + size_t cmsg_len; + size_t cmsg_space; + size_t new_cm_data_space; + union __swrap_cmsghdr __new_cmsg = { .p = NULL, }; + struct cmsghdr *new_cmsg = NULL; + uint8_t *p = NULL; + size_t i; + int pipefd[2] = { -1, -1 }; + int rc; + ssize_t sret; + + /* + * We pass this a buffer to the kernel make sure any padding + * is also cleared. + */ + ZERO_STRUCT(info); + info.magic = swrap_unix_scm_right_magic; + memcpy(info.package_name, + SOCKET_WRAPPER_PACKAGE, + sizeof(info.package_name)); + memcpy(info.package_version, + SOCKET_WRAPPER_VERSION, + sizeof(info.package_version)); + info.full_size = sizeof(info); + info.payload_size = sizeof(info.payload); + payload = &info.payload; + + if (*scm_rights_pipe_fd != -1) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "Two SCM_RIGHTS headers are not supported by socket_wrapper"); + errno = EINVAL; + return -1; + } + + if (cmsg->cmsg_len < CMSG_LEN(0)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu < CMSG_LEN(0)=%zu", + (size_t)cmsg->cmsg_len, + CMSG_LEN(0)); + errno = EINVAL; + return -1; + } + size_fds_in = cmsg->cmsg_len - CMSG_LEN(0); + if ((size_fds_in % sizeof(int)) != 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu => (size_fds_in=%zu %% sizeof(int)=%zu) != 0", + (size_t)cmsg->cmsg_len, + size_fds_in, + sizeof(int)); + errno = EINVAL; + return -1; + } + num_fds_in = size_fds_in / sizeof(int); + if (num_fds_in > SWRAP_MAX_PASSED_FDS) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu,size_fds_in=%zu => " + "num_fds_in=%zu > " + "SWRAP_MAX_PASSED_FDS(%zu)", + (size_t)cmsg->cmsg_len, + size_fds_in, + num_fds_in, + SWRAP_MAX_PASSED_FDS); + errno = EINVAL; + return -1; + } + if (num_fds_in == 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu,size_fds_in=%zu => " + "num_fds_in=%zu", + (size_t)cmsg->cmsg_len, + size_fds_in, + num_fds_in); + errno = EINVAL; + return -1; + } + __fds_in.p = CMSG_DATA(cmsg); + fds_in = __fds_in.fds; + num_fds_out = num_fds_in + 1; + + SWRAP_LOG(SWRAP_LOG_TRACE, + "num_fds_in=%zu num_fds_out=%zu", + num_fds_in, num_fds_out); + + size_fds_out = sizeof(int) * num_fds_out; + cmsg_len = CMSG_LEN(size_fds_out); + cmsg_space = CMSG_SPACE(size_fds_out); + + new_cm_data_space = *cm_data_space + cmsg_space; + + p = realloc((*cm_data), new_cm_data_space); + if (p == NULL) { + return -1; + } + (*cm_data) = p; + p = (*cm_data) + (*cm_data_space); + memset(p, 0, cmsg_space); + __new_cmsg.p = p; + new_cmsg = __new_cmsg.cmsg; + *new_cmsg = *cmsg; + __fds_out.p = CMSG_DATA(new_cmsg); + fds_out = __fds_out.fds; + memcpy(fds_out, fds_in, size_fds_in); + new_cmsg->cmsg_len = cmsg->cmsg_len; + + for (i = 0; i < num_fds_in; i++) { + size_t j; + + payload->idxs[i] = -1; + payload->num_idxs++; + + si_idx_array[i] = find_socket_info_index(fds_in[i]); + if (si_idx_array[i] == -1) { + continue; + } + + si_array[i] = swrap_get_socket_info(si_idx_array[i]); + if (si_array[i] == NULL) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "fds_in[%zu]=%d si_idx_array[%zu]=%d missing!", + i, fds_in[i], i, si_idx_array[i]); + errno = EINVAL; + return -1; + } + + for (j = 0; j < i; j++) { + if (si_array[j] == si_array[i]) { + payload->idxs[i] = payload->idxs[j]; + break; + } + } + if (payload->idxs[i] == -1) { + if (info_idx >= SWRAP_MAX_PASSED_SOCKET_INFO) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "fds_in[%zu]=%d,si_idx_array[%zu]=%d: " + "info_idx=%zu >= SWRAP_MAX_PASSED_FDS(%zu)!", + i, fds_in[i], i, si_idx_array[i], + info_idx, + SWRAP_MAX_PASSED_SOCKET_INFO); + errno = EINVAL; + return -1; + } + payload->idxs[i] = info_idx; + info_idx += 1; + continue; + } + } + + for (i = 0; i < num_fds_in; i++) { + struct socket_info *si = si_array[i]; + + if (si == NULL) { + SWRAP_LOG(SWRAP_LOG_TRACE, + "fds_in[%zu]=%d not an inet socket", + i, fds_in[i]); + continue; + } + + SWRAP_LOG(SWRAP_LOG_TRACE, + "fds_in[%zu]=%d si_idx_array[%zu]=%d " + "passing as info.idxs[%zu]=%d!", + i, fds_in[i], + i, si_idx_array[i], + i, payload->idxs[i]); + + SWRAP_LOCK_SI(si); + si->fd_passed += 1; + payload->infos[payload->idxs[i]] = *si; + payload->infos[payload->idxs[i]].fd_passed = 0; + SWRAP_UNLOCK_SI(si); + } + + rc = pipe(pipefd); + if (rc == -1) { + int saved_errno = errno; + SWRAP_LOG(SWRAP_LOG_ERROR, + "pipe() failed - %d %s", + saved_errno, + strerror(saved_errno)); + swrap_dec_fd_passed_array(num_fds_in, si_array); + errno = saved_errno; + return -1; + } + + sret = libc_write(pipefd[1], &info, sizeof(info)); + if (sret != sizeof(info)) { + int saved_errno = errno; + if (sret != -1) { + saved_errno = EINVAL; + } + SWRAP_LOG(SWRAP_LOG_ERROR, + "write() failed - sret=%zd - %d %s", + sret, saved_errno, + strerror(saved_errno)); + swrap_dec_fd_passed_array(num_fds_in, si_array); + libc_close(pipefd[1]); + libc_close(pipefd[0]); + errno = saved_errno; + return -1; + } + libc_close(pipefd[1]); + + /* + * Add the pipe read end to the end of the passed fd array + */ + fds_out[num_fds_in] = pipefd[0]; + new_cmsg->cmsg_len = cmsg_len; + + /* we're done ... */ + *scm_rights_pipe_fd = pipefd[0]; + *cm_data_space = new_cm_data_space; + + return 0; +} + +static int swrap_sendmsg_unix_sol_socket(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space, + int *scm_rights_pipe_fd) +{ + int rc = -1; + + switch (cmsg->cmsg_type) { + case SCM_RIGHTS: + rc = swrap_sendmsg_unix_scm_rights(cmsg, + cm_data, + cm_data_space, + scm_rights_pipe_fd); + break; + default: + rc = swrap_sendmsg_copy_cmsg(cmsg, + cm_data, + cm_data_space); + break; + } + + return rc; +} + +static int swrap_recvmsg_unix_scm_rights(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space) +{ + int scm_rights_pipe_fd = -1; + struct swrap_unix_scm_rights info; + struct swrap_unix_scm_rights_payload *payload = NULL; + int si_idx_array[SWRAP_MAX_PASSED_FDS]; + size_t size_fds_in; + size_t num_fds_in; + union __swrap_fds __fds_in = { .p = NULL, }; + const int *fds_in = NULL; + size_t num_fds_out; + size_t size_fds_out; + union __swrap_fds __fds_out = { .p = NULL, }; + int *fds_out = NULL; + size_t cmsg_len; + size_t cmsg_space; + size_t new_cm_data_space; + union __swrap_cmsghdr __new_cmsg = { .p = NULL, }; + struct cmsghdr *new_cmsg = NULL; + uint8_t *p = NULL; + ssize_t sret; + size_t i; + int cmp; + + if (cmsg->cmsg_len < CMSG_LEN(0)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu < CMSG_LEN(0)=%zu", + (size_t)cmsg->cmsg_len, + CMSG_LEN(0)); + errno = EINVAL; + return -1; + } + size_fds_in = cmsg->cmsg_len - CMSG_LEN(0); + if ((size_fds_in % sizeof(int)) != 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu => (size_fds_in=%zu %% sizeof(int)=%zu) != 0", + (size_t)cmsg->cmsg_len, + size_fds_in, + sizeof(int)); + errno = EINVAL; + return -1; + } + num_fds_in = size_fds_in / sizeof(int); + if (num_fds_in > (SWRAP_MAX_PASSED_FDS + 1)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu,size_fds_in=%zu => " + "num_fds_in=%zu > SWRAP_MAX_PASSED_FDS+1(%zu)", + (size_t)cmsg->cmsg_len, + size_fds_in, + num_fds_in, + SWRAP_MAX_PASSED_FDS+1); + errno = EINVAL; + return -1; + } + if (num_fds_in <= 1) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "cmsg->cmsg_len=%zu,size_fds_in=%zu => " + "num_fds_in=%zu", + (size_t)cmsg->cmsg_len, + size_fds_in, + num_fds_in); + errno = EINVAL; + return -1; + } + __fds_in.p = CMSG_DATA(cmsg); + fds_in = __fds_in.fds; + num_fds_out = num_fds_in - 1; + + SWRAP_LOG(SWRAP_LOG_TRACE, + "num_fds_in=%zu num_fds_out=%zu", + num_fds_in, num_fds_out); + + for (i = 0; i < num_fds_in; i++) { + /* Check if we have a stale fd and remove it */ + swrap_remove_stale(fds_in[i]); + } + + scm_rights_pipe_fd = fds_in[num_fds_out]; + size_fds_out = sizeof(int) * num_fds_out; + cmsg_len = CMSG_LEN(size_fds_out); + cmsg_space = CMSG_SPACE(size_fds_out); + + new_cm_data_space = *cm_data_space + cmsg_space; + + p = realloc((*cm_data), new_cm_data_space); + if (p == NULL) { + swrap_close_fd_array(num_fds_in, fds_in); + return -1; + } + (*cm_data) = p; + p = (*cm_data) + (*cm_data_space); + memset(p, 0, cmsg_space); + __new_cmsg.p = p; + new_cmsg = __new_cmsg.cmsg; + *new_cmsg = *cmsg; + __fds_out.p = CMSG_DATA(new_cmsg); + fds_out = __fds_out.fds; + memcpy(fds_out, fds_in, size_fds_out); + new_cmsg->cmsg_len = cmsg_len; + + sret = read(scm_rights_pipe_fd, &info, sizeof(info)); + if (sret != sizeof(info)) { + int saved_errno = errno; + if (sret != -1) { + saved_errno = EINVAL; + } + SWRAP_LOG(SWRAP_LOG_ERROR, + "read() failed - sret=%zd - %d %s", + sret, saved_errno, + strerror(saved_errno)); + swrap_close_fd_array(num_fds_in, fds_in); + errno = saved_errno; + return -1; + } + libc_close(scm_rights_pipe_fd); + payload = &info.payload; + + if (info.magic != swrap_unix_scm_right_magic) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "info.magic=0x%llx != swrap_unix_scm_right_magic=0x%llx", + (unsigned long long)info.magic, + (unsigned long long)swrap_unix_scm_right_magic); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + cmp = memcmp(info.package_name, + SOCKET_WRAPPER_PACKAGE, + sizeof(info.package_name)); + if (cmp != 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "info.package_name='%.*s' != '%s'", + (int)sizeof(info.package_name), + info.package_name, + SOCKET_WRAPPER_PACKAGE); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + cmp = memcmp(info.package_version, + SOCKET_WRAPPER_VERSION, + sizeof(info.package_version)); + if (cmp != 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "info.package_version='%.*s' != '%s'", + (int)sizeof(info.package_version), + info.package_version, + SOCKET_WRAPPER_VERSION); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + if (info.full_size != sizeof(info)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "info.full_size=%zu != sizeof(info)=%zu", + (size_t)info.full_size, + sizeof(info)); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + if (info.payload_size != sizeof(info.payload)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "info.payload_size=%zu != sizeof(info.payload)=%zu", + (size_t)info.payload_size, + sizeof(info.payload)); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + if (payload->num_idxs != num_fds_out) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "info.num_idxs=%u != num_fds_out=%zu", + payload->num_idxs, num_fds_out); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + for (i = 0; i < num_fds_out; i++) { + size_t j; + + si_idx_array[i] = -1; + + if (payload->idxs[i] == -1) { + SWRAP_LOG(SWRAP_LOG_TRACE, + "fds_out[%zu]=%d not an inet socket", + i, fds_out[i]); + continue; + } + + if (payload->idxs[i] < 0) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "fds_out[%zu]=%d info.idxs[%zu]=%d < 0!", + i, fds_out[i], i, payload->idxs[i]); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + if (payload->idxs[i] >= payload->num_idxs) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "fds_out[%zu]=%d info.idxs[%zu]=%d >= %u!", + i, fds_out[i], i, payload->idxs[i], + payload->num_idxs); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EINVAL; + return -1; + } + + if ((size_t)fds_out[i] >= socket_fds_max) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "The max socket index limit of %zu has been reached, " + "trying to add %d", + socket_fds_max, + fds_out[i]); + swrap_close_fd_array(num_fds_out, fds_out); + errno = EMFILE; + return -1; + } + + SWRAP_LOG(SWRAP_LOG_TRACE, + "fds_in[%zu]=%d " + "received as info.idxs[%zu]=%d!", + i, fds_out[i], + i, payload->idxs[i]); + + for (j = 0; j < i; j++) { + if (payload->idxs[j] == -1) { + continue; + } + if (payload->idxs[j] == payload->idxs[i]) { + si_idx_array[i] = si_idx_array[j]; + } + } + if (si_idx_array[i] == -1) { + const struct socket_info *si = &payload->infos[payload->idxs[i]]; + + si_idx_array[i] = swrap_add_socket_info(si); + if (si_idx_array[i] == -1) { + int saved_errno = errno; + SWRAP_LOG(SWRAP_LOG_ERROR, + "The max socket index limit of %zu has been reached, " + "trying to add %d", + socket_fds_max, + fds_out[i]); + swrap_undo_si_idx_array(i, si_idx_array); + swrap_close_fd_array(num_fds_out, fds_out); + errno = saved_errno; + return -1; + } + SWRAP_LOG(SWRAP_LOG_TRACE, + "Imported %s socket for protocol %s, fd=%d", + si->family == AF_INET ? "IPv4" : "IPv6", + si->type == SOCK_DGRAM ? "UDP" : "TCP", + fds_out[i]); + } + } + + for (i = 0; i < num_fds_out; i++) { + if (si_idx_array[i] == -1) { + continue; + } + set_socket_info_index(fds_out[i], si_idx_array[i]); + } + + /* we're done ... */ + *cm_data_space = new_cm_data_space; + + return 0; +} + +static int swrap_recvmsg_unix_sol_socket(const struct cmsghdr *cmsg, + uint8_t **cm_data, + size_t *cm_data_space) +{ + int rc = -1; + + switch (cmsg->cmsg_type) { + case SCM_RIGHTS: + rc = swrap_recvmsg_unix_scm_rights(cmsg, + cm_data, + cm_data_space); + break; + default: + rc = swrap_sendmsg_copy_cmsg(cmsg, + cm_data, + cm_data_space); + break; + } + + return rc; +} + +#endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ + +static int swrap_sendmsg_before_unix(const struct msghdr *_msg_in, + struct msghdr *msg_tmp, + int *scm_rights_pipe_fd) +{ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + struct msghdr *msg_in = discard_const_p(struct msghdr, _msg_in); + struct cmsghdr *cmsg = NULL; + uint8_t *cm_data = NULL; + size_t cm_data_space = 0; + int rc = -1; + + *msg_tmp = *msg_in; + *scm_rights_pipe_fd = -1; + + /* Nothing to do */ + if (msg_in->msg_controllen == 0 || msg_in->msg_control == NULL) { + return 0; + } + + for (cmsg = CMSG_FIRSTHDR(msg_in); + cmsg != NULL; + cmsg = CMSG_NXTHDR(msg_in, cmsg)) { + switch (cmsg->cmsg_level) { + case SOL_SOCKET: + rc = swrap_sendmsg_unix_sol_socket(cmsg, + &cm_data, + &cm_data_space, + scm_rights_pipe_fd); + break; + + default: + rc = swrap_sendmsg_copy_cmsg(cmsg, + &cm_data, + &cm_data_space); + break; + } + if (rc < 0) { + int saved_errno = errno; + SAFE_FREE(cm_data); + errno = saved_errno; + return rc; + } + } + + msg_tmp->msg_controllen = cm_data_space; + msg_tmp->msg_control = cm_data; + + return 0; +#else /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ + *msg_tmp = *_msg_in; + return 0; +#endif /* ! HAVE_STRUCT_MSGHDR_MSG_CONTROL */ +} + +static ssize_t swrap_sendmsg_after_unix(struct msghdr *msg_tmp, + ssize_t ret, + int scm_rights_pipe_fd) +{ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + int saved_errno = errno; + SAFE_FREE(msg_tmp->msg_control); + if (scm_rights_pipe_fd != -1) { + libc_close(scm_rights_pipe_fd); + } + errno = saved_errno; +#endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ + return ret; +} + +static int swrap_recvmsg_before_unix(struct msghdr *msg_in, + struct msghdr *msg_tmp, + uint8_t **tmp_control) +{ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + const size_t cm_extra_space = CMSG_SPACE(sizeof(int)); + uint8_t *cm_data = NULL; + size_t cm_data_space = 0; + + *msg_tmp = *msg_in; + *tmp_control = NULL; + + SWRAP_LOG(SWRAP_LOG_TRACE, + "msg_in->msg_controllen=%zu", + (size_t)msg_in->msg_controllen); + + /* Nothing to do */ + if (msg_in->msg_controllen == 0 || msg_in->msg_control == NULL) { + return 0; + } + + /* + * We need to give the kernel a bit more space in order + * recv the pipe fd, added by swrap_sendmsg_before_unix()). + * swrap_recvmsg_after_unix() will hide it again. + */ + cm_data_space = msg_in->msg_controllen; + if (cm_data_space < (INT32_MAX - cm_extra_space)) { + cm_data_space += cm_extra_space; + } + cm_data = calloc(1, cm_data_space); + if (cm_data == NULL) { + return -1; + } + + msg_tmp->msg_controllen = cm_data_space; + msg_tmp->msg_control = cm_data; + *tmp_control = cm_data; + + SWRAP_LOG(SWRAP_LOG_TRACE, + "msg_tmp->msg_controllen=%zu", + (size_t)msg_tmp->msg_controllen); + return 0; +#else /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ + *msg_tmp = *msg_in; + *tmp_control = NULL; + return 0; +#endif /* ! HAVE_STRUCT_MSGHDR_MSG_CONTROL */ +} + +static ssize_t swrap_recvmsg_after_unix(struct msghdr *msg_tmp, + uint8_t **tmp_control, + struct msghdr *msg_out, + ssize_t ret) +{ +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + struct cmsghdr *cmsg = NULL; + uint8_t *cm_data = NULL; + size_t cm_data_space = 0; + int rc = -1; + + if (ret < 0) { + int saved_errno = errno; + SWRAP_LOG(SWRAP_LOG_TRACE, "ret=%zd - %d - %s", ret, + saved_errno, strerror(saved_errno)); + SAFE_FREE(*tmp_control); + /* msg_out should not be touched on error */ + errno = saved_errno; + return ret; + } + + SWRAP_LOG(SWRAP_LOG_TRACE, + "msg_tmp->msg_controllen=%zu", + (size_t)msg_tmp->msg_controllen); + + /* Nothing to do */ + if (msg_tmp->msg_controllen == 0 || msg_tmp->msg_control == NULL) { + int saved_errno = errno; + *msg_out = *msg_tmp; + SAFE_FREE(*tmp_control); + errno = saved_errno; + return ret; + } + + for (cmsg = CMSG_FIRSTHDR(msg_tmp); + cmsg != NULL; + cmsg = CMSG_NXTHDR(msg_tmp, cmsg)) { + switch (cmsg->cmsg_level) { + case SOL_SOCKET: + rc = swrap_recvmsg_unix_sol_socket(cmsg, + &cm_data, + &cm_data_space); + break; + + default: + rc = swrap_sendmsg_copy_cmsg(cmsg, + &cm_data, + &cm_data_space); + break; + } + if (rc < 0) { + int saved_errno = errno; + SAFE_FREE(cm_data); + SAFE_FREE(*tmp_control); + errno = saved_errno; + return rc; + } + } + + /* + * msg_tmp->msg_control (*tmp_control) was created by + * swrap_recvmsg_before_unix() and msg_out->msg_control + * is still the buffer of the caller. + */ + msg_tmp->msg_control = msg_out->msg_control; + msg_tmp->msg_controllen = msg_out->msg_controllen; + *msg_out = *msg_tmp; + + cm_data_space = MIN(cm_data_space, msg_out->msg_controllen); + memcpy(msg_out->msg_control, cm_data, cm_data_space); + msg_out->msg_controllen = cm_data_space; + SAFE_FREE(cm_data); + SAFE_FREE(*tmp_control); + + SWRAP_LOG(SWRAP_LOG_TRACE, + "msg_out->msg_controllen=%zu", + (size_t)msg_out->msg_controllen); + return ret; +#else /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ + int saved_errno = errno; + *msg_out = *msg_tmp; + SAFE_FREE(*tmp_control); + errno = saved_errno; + return ret; +#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 = -1; + + if (to_un) { + *to_un = NULL; + } + if (to) { + *to = NULL; + } + if (bcast) { + *bcast = 0; + } + + SWRAP_LOCK_SI(si); + + switch (si->type) { + case SOCK_STREAM: { + unsigned long mtu; + + if (!si->connected) { + errno = ENOTCONN; + goto out; + } + + 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 < len) { + /* overflow */ + errno = EMSGSIZE; + goto out; + } + 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; + goto out; + } + + + ret = sockaddr_convert_to_un(si, msg_name, msg->msg_namelen, + tmp_un, 0, bcast); + if (ret == -1) { + goto out; + } + + 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) { + SWRAP_UNLOCK_SI(si); + if (errno == ENOTSOCK) { + swrap_remove_stale(fd); + ret = -ENOTSOCK; + } else { + SWRAP_LOG(SWRAP_LOG_ERROR, "swrap_sendmsg_before failed"); + } + return ret; + } + } + + 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) { + goto out; + } + + 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) { + goto out; + } + + si->defer_connect = 0; + break; + default: + errno = EHOSTUNREACH; + goto out; + } + + ret = 0; +out: + SWRAP_UNLOCK_SI(si); + + return ret; +} + +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); + if (this_time > 0) { + memcpy(buf + ofs, + msg->msg_iov[i].iov_base, + this_time); + } + ofs += this_time; + remain -= this_time; + } + len = ofs; + + SWRAP_LOCK_SI(si); + + 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; + } + + SWRAP_UNLOCK_SI(si); + + 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; + int ret = -1; + + SWRAP_LOCK_SI(si); + + (void)fd; /* unused */ + + switch (si->type) { + case SOCK_STREAM: { + unsigned int mtu; + if (!si->connected) { + errno = ENOTCONN; + goto out; + } + + 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; + goto out; + } + + if (msg->msg_iovlen == 0) { + break; + } + + if (si->bound == 0) { + ret = swrap_auto_bind(fd, si, si->family); + if (ret == -1) { + SWRAP_UNLOCK_SI(si); + /* + * 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); + ret = -ENOTSOCK; + } else { + SWRAP_LOG(SWRAP_LOG_ERROR, + "swrap_recvmsg_before failed"); + } + return ret; + } + } + break; + default: + errno = EHOSTUNREACH; + goto out; + } + + ret = 0; +out: + SWRAP_UNLOCK_SI(si); + + return ret; +} + +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; + } + + SWRAP_LOCK_SI(si); + + /* 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 */ + SWRAP_UNLOCK_SI(si); + 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) { + SWRAP_UNLOCK_SI(si); + return -1; + } + } +#endif + + SWRAP_UNLOCK_SI(si); + 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 */ +#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_sendmsg_before(s, + si, + &msg, + &tmp, + &un_addr.sa.un, + &to_un, + &to, + &bcast); + if (rc < 0) { + return -1; + } + + buf = msg.msg_iov[0].iov_base; + len = msg.msg_iov[0].iov_len; + + if (bcast) { + struct stat st; + unsigned int iface; + unsigned int prt = ntohs(((const struct sockaddr_in *)(const void *)to)->sin_port); + char type; + char *swrap_dir = NULL; + + type = SOCKET_TYPE_CHAR_UDP; + + swrap_dir = socket_wrapper_dir(); + if (swrap_dir == NULL) { + return -1; + } + + for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) { + swrap_un_path(&un_addr.sa.un, + swrap_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); + } + + SAFE_FREE(swrap_dir); + + SWRAP_LOCK_SI(si); + + swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len); + + SWRAP_UNLOCK_SI(si); + + return len; + } + + SWRAP_LOCK_SI(si); + /* + * 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_UNLOCK_SI(si); + + 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 */ +#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_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 */ +#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_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) { + uint8_t *tmp_control = NULL; + rc = swrap_recvmsg_before_unix(omsg, &msg, &tmp_control); + if (rc < 0) { + return rc; + } + ret = libc_recvmsg(s, &msg, flags); + return swrap_recvmsg_after_unix(&msg, &tmp_control, omsg, ret); + } + + 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; + + SWRAP_LOCK_SI(si); + + /* + * 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; + } + + SWRAP_UNLOCK_SI(si); + + 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) { + int scm_rights_pipe_fd = -1; + + rc = swrap_sendmsg_before_unix(omsg, &msg, + &scm_rights_pipe_fd); + if (rc < 0) { + return rc; + } + ret = libc_sendmsg(s, &msg, flags); + return swrap_sendmsg_after_unix(&msg, ret, scm_rights_pipe_fd); + } + + ZERO_STRUCT(un_addr); + + tmp.iov_base = NULL; + tmp.iov_len = 0; + + ZERO_STRUCT(msg); + + SWRAP_LOCK_SI(si); + + 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 */ + + SWRAP_UNLOCK_SI(si); + +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + if (omsg != NULL && omsg->msg_controllen > 0 && omsg->msg_control != NULL) { + uint8_t *cmbuf = NULL; + size_t cmlen = 0; + + rc = swrap_sendmsg_filter_cmsghdr(omsg, &cmbuf, &cmlen); + if (rc < 0) { + return rc; + } + + if (cmlen == 0) { + msg.msg_controllen = 0; + msg.msg_control = NULL; + } else { + msg.msg_control = cmbuf; + msg.msg_controllen = cmlen; + } + } + 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) { + int saved_errno = errno; +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + SAFE_FREE(msg.msg_control); +#endif + errno = saved_errno; + 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; + char *swrap_dir = NULL; + + 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) { + int saved_errno = errno; +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + SAFE_FREE(msg.msg_control); +#endif + 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; + } + + type = SOCKET_TYPE_CHAR_UDP; + + swrap_dir = socket_wrapper_dir(); + if (swrap_dir == NULL) { + int saved_errno = errno; +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + SAFE_FREE(msg.msg_control); +#endif + SAFE_FREE(buf); + errno = saved_errno; + return -1; + } + + for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) { + swrap_un_path(&un_addr, swrap_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); + } + + SAFE_FREE(swrap_dir); + + SWRAP_LOCK_SI(si); + + swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len); + free(buf); + + SWRAP_UNLOCK_SI(si); + + return len; + } + + ret = libc_sendmsg(s, &msg, flags); + + swrap_sendmsg_after(s, si, &msg, to, ret); + +#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL + { + int saved_errno = errno; + SAFE_FREE(msg.msg_control); + errno = saved_errno; + } +#endif + + 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 */ +#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_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_remove_wrapper(const char *__func_name, + int (*__close_fd_fn)(int fd), + int fd) +{ + struct socket_info *si = NULL; + int si_index; + int ret_errno = errno; + int ret; + + swrap_mutex_lock(&socket_reset_mutex); + + si_index = find_socket_info_index(fd); + if (si_index == -1) { + swrap_mutex_unlock(&socket_reset_mutex); + return __close_fd_fn(fd); + } + + swrap_log(SWRAP_LOG_TRACE, __func_name, "Remove wrapper for fd=%d", fd); + reset_socket_info_index(fd); + + si = swrap_get_socket_info(si_index); + + swrap_mutex_lock(&first_free_mutex); + SWRAP_LOCK_SI(si); + + ret = __close_fd_fn(fd); + if (ret == -1) { + ret_errno = errno; + } + + swrap_dec_refcount(si); + + if (swrap_get_refcount(si) > 0) { + /* there are still references left */ + goto out; + } + + if (si->fd_passed) { + goto set_next_free; + } + + if (si->myname.sa_socklen > 0 && si->peername.sa_socklen > 0) { + swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0); + } + + 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); + } + +set_next_free: + swrap_set_next_free(si, first_free); + first_free = si_index; + +out: + SWRAP_UNLOCK_SI(si); + swrap_mutex_unlock(&first_free_mutex); + swrap_mutex_unlock(&socket_reset_mutex); + + errno = ret_errno; + return ret; +} + +static int swrap_noop_close(int fd) +{ + (void)fd; /* unused */ + return 0; +} + +static void swrap_remove_stale(int fd) +{ + swrap_remove_wrapper(__func__, swrap_noop_close, fd); +} + +/* + * This allows socket_wrapper aware applications to + * indicate that the given fd does not belong to + * an inet socket. + * + * We already overload a lot of unrelated functions + * like eventfd(), timerfd_create(), ... in order to + * call swrap_remove_stale() on the returned fd, but + * we'll never be able to handle all possible syscalls. + * + * socket_wrapper_indicate_no_inet_fd() gives them a way + * to do the same. + * + * We don't export swrap_remove_stale() in order to + * make it easier to analyze SOCKET_WRAPPER_DEBUGLEVEL=3 + * log files. + */ +void socket_wrapper_indicate_no_inet_fd(int fd) +{ + swrap_remove_wrapper(__func__, swrap_noop_close, fd); +} + +static int swrap_close(int fd) +{ + return swrap_remove_wrapper(__func__, libc_close, fd); +} + +int close(int fd) +{ + return swrap_close(fd); +} + +#ifdef HAVE___CLOSE_NOCANCEL + +static int swrap___close_nocancel(int fd) +{ + return swrap_remove_wrapper(__func__, libc___close_nocancel, fd); +} + +int __close_nocancel(int fd); +int __close_nocancel(int fd) +{ + return swrap___close_nocancel(fd); +} + +#endif /* HAVE___CLOSE_NOCANCEL */ + +/**************************** + * DUP + ***************************/ + +static int swrap_dup(int fd) +{ + struct socket_info *si; + int dup_fd, idx; + + idx = find_socket_info_index(fd); + if (idx == -1) { + return libc_dup(fd); + } + + si = swrap_get_socket_info(idx); + + dup_fd = libc_dup(fd); + if (dup_fd == -1) { + int saved_errno = errno; + errno = saved_errno; + return -1; + } + + if ((size_t)dup_fd >= socket_fds_max) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "The max socket index limit of %zu has been reached, " + "trying to add %d", + socket_fds_max, + dup_fd); + libc_close(dup_fd); + errno = EMFILE; + return -1; + } + + SWRAP_LOCK_SI(si); + + swrap_inc_refcount(si); + + SWRAP_UNLOCK_SI(si); + + /* Make sure we don't have an entry for the fd */ + swrap_remove_stale(dup_fd); + + set_socket_info_index(dup_fd, idx); + + return dup_fd; +} + +int dup(int fd) +{ + return swrap_dup(fd); +} + +/**************************** + * DUP2 + ***************************/ + +static int swrap_dup2(int fd, int newfd) +{ + struct socket_info *si; + int dup_fd, idx; + + idx = find_socket_info_index(fd); + if (idx == -1) { + return libc_dup2(fd, newfd); + } + + si = swrap_get_socket_info(idx); + + if (fd == newfd) { + /* + * According to the manpage: + * + * "If oldfd is a valid file descriptor, and newfd has the same + * value as oldfd, then dup2() does nothing, and returns newfd." + */ + return newfd; + } + + if ((size_t)newfd >= socket_fds_max) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "The max socket index limit of %zu has been reached, " + "trying to add %d", + socket_fds_max, + newfd); + errno = EMFILE; + return -1; + } + + if (find_socket_info(newfd)) { + /* dup2() does an implicit close of newfd, which we + * need to emulate */ + swrap_close(newfd); + } + + dup_fd = libc_dup2(fd, newfd); + if (dup_fd == -1) { + int saved_errno = errno; + errno = saved_errno; + return -1; + } + + SWRAP_LOCK_SI(si); + + swrap_inc_refcount(si); + + SWRAP_UNLOCK_SI(si); + + /* Make sure we don't have an entry for the fd */ + swrap_remove_stale(dup_fd); + + set_socket_info_index(dup_fd, idx); + + return dup_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 *si; + int rc, dup_fd, idx; + + idx = find_socket_info_index(fd); + if (idx == -1) { + return libc_vfcntl(fd, cmd, va); + } + + si = swrap_get_socket_info(idx); + + switch (cmd) { + case F_DUPFD: + dup_fd = libc_vfcntl(fd, cmd, va); + if (dup_fd == -1) { + int saved_errno = errno; + errno = saved_errno; + return -1; + } + + /* Make sure we don't have an entry for the fd */ + swrap_remove_stale(dup_fd); + + if ((size_t)dup_fd >= socket_fds_max) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "The max socket index limit of %zu has been reached, " + "trying to add %d", + socket_fds_max, + dup_fd); + libc_close(dup_fd); + errno = EMFILE; + return -1; + } + + SWRAP_LOCK_SI(si); + + swrap_inc_refcount(si); + + SWRAP_UNLOCK_SI(si); + + + set_socket_info_index(dup_fd, idx); + + rc = dup_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 */ + +static void swrap_thread_prepare(void) +{ + /* + * This function should only be called here!! + * + * We bind all symobls to avoid deadlocks of the fork is + * interrupted by a signal handler using a symbol of this + * library. + */ + swrap_bind_symbol_all(); + + SWRAP_LOCK_ALL; +} + +static void swrap_thread_parent(void) +{ + SWRAP_UNLOCK_ALL; +} + +static void swrap_thread_child(void) +{ + SWRAP_REINIT_ALL; +} + +/**************************** + * CONSTRUCTOR + ***************************/ +void swrap_constructor(void) +{ + if (PIPE_BUF < sizeof(struct swrap_unix_scm_rights)) { + SWRAP_LOG(SWRAP_LOG_ERROR, + "PIPE_BUF=%zu < " + "sizeof(struct swrap_unix_scm_rights)=%zu\n" + "sizeof(struct swrap_unix_scm_rights_payload)=%zu " + "sizeof(struct socket_info)=%zu", + (size_t)PIPE_BUF, + sizeof(struct swrap_unix_scm_rights), + sizeof(struct swrap_unix_scm_rights_payload), + sizeof(struct socket_info)); + exit(-1); + } + + SWRAP_REINIT_ALL; + + /* + * If we hold a lock and the application forks, then the child + * is not able to unlock the mutex and we are in a deadlock. + * This should prevent such deadlocks. + */ + pthread_atfork(&swrap_thread_prepare, + &swrap_thread_parent, + &swrap_thread_child); +} + +/**************************** + * 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) +{ + size_t i; + + if (socket_fds_idx != NULL) { + for (i = 0; i < socket_fds_max; ++i) { + if (socket_fds_idx[i] != -1) { + swrap_close(i); + } + } + SAFE_FREE(socket_fds_idx); + } + + SAFE_FREE(sockets); + + if (swrap.libc.handle != NULL) { + dlclose(swrap.libc.handle); + } + if (swrap.libc.socket_handle) { + dlclose(swrap.libc.socket_handle); + } +} + +#if defined(HAVE__SOCKET) && defined(HAVE__CLOSE) +/* + * On FreeBSD 12 (and maybe other platforms) + * system libraries like libresolv prefix there + * syscalls with '_' in order to always use + * the symbols from libc. + * + * In the interaction with resolv_wrapper, + * we need to inject socket wrapper into libresolv, + * which means we need to private all socket + * related syscalls also with the '_' prefix. + * + * This is tested in Samba's 'make test', + * there we noticed that providing '_read', + * '_open' and '_close' would cause errors, which + * means we skip '_read', '_write' and + * all non socket related calls without + * further analyzing the problem. + */ +#define SWRAP_SYMBOL_ALIAS(__sym, __aliassym) \ + extern typeof(__sym) __aliassym __attribute__ ((alias(#__sym))) + +#ifdef HAVE_ACCEPT4 +SWRAP_SYMBOL_ALIAS(accept4, _accept4); +#endif +SWRAP_SYMBOL_ALIAS(accept, _accept); +SWRAP_SYMBOL_ALIAS(bind, _bind); +SWRAP_SYMBOL_ALIAS(connect, _connect); +SWRAP_SYMBOL_ALIAS(dup, _dup); +SWRAP_SYMBOL_ALIAS(dup2, _dup2); +SWRAP_SYMBOL_ALIAS(fcntl, _fcntl); +SWRAP_SYMBOL_ALIAS(getpeername, _getpeername); +SWRAP_SYMBOL_ALIAS(getsockname, _getsockname); +SWRAP_SYMBOL_ALIAS(getsockopt, _getsockopt); +SWRAP_SYMBOL_ALIAS(ioctl, _ioctl); +SWRAP_SYMBOL_ALIAS(listen, _listen); +SWRAP_SYMBOL_ALIAS(readv, _readv); +SWRAP_SYMBOL_ALIAS(recv, _recv); +SWRAP_SYMBOL_ALIAS(recvfrom, _recvfrom); +SWRAP_SYMBOL_ALIAS(recvmsg, _recvmsg); +SWRAP_SYMBOL_ALIAS(send, _send); +SWRAP_SYMBOL_ALIAS(sendmsg, _sendmsg); +SWRAP_SYMBOL_ALIAS(sendto, _sendto); +SWRAP_SYMBOL_ALIAS(setsockopt, _setsockopt); +SWRAP_SYMBOL_ALIAS(socket, _socket); +SWRAP_SYMBOL_ALIAS(socketpair, _socketpair); +SWRAP_SYMBOL_ALIAS(writev, _writev); + +#endif /* SOCKET_WRAPPER_EXPORT_UNDERSCORE_SYMBOLS */ |