From 77107ab307336b504747041a5cf4c79112e419b7 Mon Sep 17 00:00:00 2001 From: Simon Ruderich Date: Sun, 1 Dec 2013 23:56:56 +0100 Subject: [PATCH] Initial commit. --- .gitignore | 19 ++ COPYING | 674 ++++++++++++++++++++++++++++++++++++++++++++++ Makefile.am | 3 + README | 107 ++++++++ configure.ac | 41 +++ src/Makefile.am | 11 + src/socket2unix.c | 588 ++++++++++++++++++++++++++++++++++++++++ 7 files changed, 1443 insertions(+) create mode 100644 .gitignore create mode 100644 COPYING create mode 100644 Makefile.am create mode 100644 README create mode 100644 configure.ac create mode 100644 src/Makefile.am create mode 100644 src/socket2unix.c diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c9a1cb6 --- /dev/null +++ b/.gitignore @@ -0,0 +1,19 @@ +/aclocal.m4 +/autom4te.cache/ +/build-aux/ +/config.h +/config.h.in +/config.log +/config.status +/configure +/libtool +/m4/ +/Makefile +/Makefile.in +/src/.deps/ +/src/.libs/ +/src/libsocket2unix.la +/src/Makefile +/src/Makefile.in +/src/socket2unix.lo +/stamp-h1 diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..26226b0 --- /dev/null +++ b/Makefile.am @@ -0,0 +1,3 @@ +SUBDIRS = src + +ACLOCAL_AMFLAGS = -I m4 diff --git a/README b/README new file mode 100644 index 0000000..ba408bd --- /dev/null +++ b/README @@ -0,0 +1,107 @@ +README +====== + +socket2unix is a simple 'LD_PRELOAD' wrapper to ``convert'' network sockets to +UNIX sockets. Useful on remote systems with untrusted users (but trusted root) +to be able to launch a server which is accessible only by the user. Normal +sockets are usable by everyone on the system. + +It works for both servers (`listen(3)`) and clients (`connect(3)`). + +These UNIX sockets can also be forwared over SSH with `socat`. + + +DEPENDENCIES +------------ + +- C99 compiler +- dynamic linker/loader which supports 'LD_PRELOAD' (e.g. GNU/Linux's or + FreeBSD's ld.so) + + +INSTALLATION +------------ + + ./configure && make && make check + +Then either install the library with `make install` or just copy it from +`src/.libs/` to wherever you want to install it: + + rm -f /destination/path/for/library/libsocket2unix.so + cp -L src/.libs/libsocket2unix.so /destination/path/for/library/ + +*Important:* Don't overwrite an existing `libsocket2unix.so` file which is use +by any program. Instead remove the file first and then copy the new version. +This is not a bug in socket2unix, but a general problem. + + +USAGE +----- + +Set 'LD_PRELOAD' to include the _absolute_ path to `libsocket2unix.so`: + + LD_PRELOAD=/absolute/path/to/libsocket2unix.so + +The 'SOCKET2UNIX_PATH' environment variable must be set to the path of the +UNIX socket to use (client) or create (server). The IP version ("v4" or "v6") +and the port number (if applicable) is appended to create a unique path. + + +Example (server): + + $ LD_PRELOAD=/path/to/libsocket2unix.so \ + SOCKET2UNIX_PATH=`pwd`/test nc -l -p 5000 + +This creates two sockets named `socket-v4-5000` and `socket-v6-5000` in the +current directory. If the files already exist and are sockets, they are +overwritten. Other file types are not touched. + +Example (client): + + $ LD_PRELOAD=/path/to/libsocket2unix.so \ + SOCKET2UNIX_PATH=`pwd`/test nc localhost 5000 + +`nc` connects to the server socket created above and both instances can talk +to each other without knowing they use an UNIX socket instead of a TCP +connection on port 5000. + + +The following additional environment variables are available: + +- 'SOCKET2UNIX_DEBUG': + Control debug level. 1 = errors only, 2 = warnings only, 3 = debug messages. + Default: 2 + + +BUGS +---- + +If you find any bugs not mentioned in this document please report them to + with socket2unix in the subject. + + +AUTHORS +------- + +Written by Simon Ruderich . + + +LICENSE +------- + +socket2unix is licensed under GPL version 3 or later. + +Copyright (C) 2013 Simon Ruderich + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..61ecbbb --- /dev/null +++ b/configure.ac @@ -0,0 +1,41 @@ +dnl Copyright (C) 2013 Simon Ruderich +dnl +dnl This program is free software: you can redistribute it and/or modify +dnl it under the terms of the GNU General Public License as published by +dnl the Free Software Foundation, either version 3 of the License, or +dnl (at your option) any later version. +dnl +dnl This program is distributed in the hope that it will be useful, +dnl but WITHOUT ANY WARRANTY; without even the implied warranty of +dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +dnl GNU General Public License for more details. +dnl +dnl You should have received a copy of the GNU General Public License +dnl along with this program. If not, see . + + +AC_PREREQ([2.69]) +AC_INIT([socket2unix],[0.1],[simon@ruderich.org]) + +AC_CONFIG_AUX_DIR([build-aux]) +AC_CONFIG_MACRO_DIR([m4]) +AC_CONFIG_HEADERS([config.h]) +AC_CONFIG_SRCDIR([src/socket2unix.c]) + +AM_PROG_AR +AM_INIT_AUTOMAKE([foreign -Wall -Werror]) +LT_PREREQ([2.4]) +LT_INIT([disable-static]) + +AC_PROG_CC + +if test "x$GCC" = xyes; then + CFLAGS="-Wall -Wextra -Wconversion $CFLAGS" +fi + +AC_TYPE_SIZE_T + +AC_SEARCH_LIBS([dlsym], [dl], [], [AC_MSG_ERROR([dlsym() is required])]) + +AC_CONFIG_FILES([Makefile src/Makefile]) +AC_OUTPUT diff --git a/src/Makefile.am b/src/Makefile.am new file mode 100644 index 0000000..25a76be --- /dev/null +++ b/src/Makefile.am @@ -0,0 +1,11 @@ +lib_LTLIBRARIES = libsocket2unix.la +libsocket2unix_la_SOURCES = socket2unix.c + +# Make sure the library is not writable. See README why this is important. Is +# not run with `make libsocket2unix.la`, but this isn't common usage. +all-local: $(lib_LTLIBRARIES) + find .libs -type f -exec chmod ugo-w '{}' \; +# `install` uses normal permissions, "fix" them so `make install` also +# installs non-writable files. +install-exec-hook: + find $(DESTDIR)$(libdir) -type f -exec chmod ugo-w '{}' \; diff --git a/src/socket2unix.c b/src/socket2unix.c new file mode 100644 index 0000000..87c91e7 --- /dev/null +++ b/src/socket2unix.c @@ -0,0 +1,588 @@ +/* + * Simple LD_PRELOAD wrapper to "convert" network sockets to UNIX sockets; + * works for clients and servers. See README for details. + * + * Copyright (C) 2013 Simon Ruderich + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + + +/* Necessary for RTLD_NEXT. */ +#define _GNU_SOURCE + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +/* CONSTANTS */ + +#define LOG_LEVEL_ERROR 1 +#define LOG_LEVEL_WARNING 2 +#define LOG_LEVEL_DEBUG 3 +#define LOG_LEVEL_MASK LOG_LEVEL_DEBUG + +#define LOG_LEVEL_PERROR 42 + + +/* GLOBAL VARIABLES */ + +struct list { + int unix_sockfd; + + int orig_domain; + int orig_type; + + struct list *next; +}; + +static struct list socket_list = { + .unix_sockfd = -1, /* must not match a valid sockfd */ +}; + + +/* LOG FUNCTIONS/MACROS */ + +static int get_log_level(void); + +static void log_helper(int action, const char *file, int line, const char *format, va_list ap) { + int saved_errno = errno; + + static int log_level; + if (!log_level) { + log_level = get_log_level(); + } + + int level = action & LOG_LEVEL_MASK; + if (level > log_level) { + return; + } + + const char *prefix; + if (level == LOG_LEVEL_DEBUG) { + prefix = "DEBUG"; + } else if (level == LOG_LEVEL_WARNING) { + prefix = "WARN "; + } else if (level == LOG_LEVEL_ERROR) { + prefix = "ERROR"; + } else { + prefix = "UNKNOWN"; + } + + /* Prevent other threads from interrupting the printf()s. */ + flockfile(stderr); + + fprintf(stderr, "socket2unix [%s] ", prefix); + fprintf(stderr, "[%s:%3d] ", file, line); + vfprintf(stderr, format, ap); + + if ((action & ~LOG_LEVEL_MASK) == LOG_LEVEL_PERROR) { + fprintf(stderr, ": "); + + errno = saved_errno; + perror(""); + } + + funlockfile(stderr); + + if (level == LOG_LEVEL_ERROR) { + fprintf(stderr, "Aborting.\n"); + exit(EXIT_FAILURE); + } +} + +static void log_(int level, const char *file, int line, const char *format, ...) + __attribute__((format(printf, 4, 5))); +static void log_(int level, const char *file, int line, const char *format, ...) { + va_list ap; + + va_start(ap, format); + log_helper(level, file, line, format, ap); + va_end(ap); +} + +#define ERROR(...) \ + log_(LOG_LEVEL_ERROR, __FILE__, __LINE__, __VA_ARGS__) +#define WARN(...) \ + log_(LOG_LEVEL_WARNING, __FILE__, __LINE__, __VA_ARGS__) +#define DEBUG(...) \ + log_(LOG_LEVEL_DEBUG, __FILE__, __LINE__, __VA_ARGS__) + +#define DIE(...) \ + log_(LOG_LEVEL_ERROR | LOG_LEVEL_PERROR, __FILE__, __LINE__, __VA_ARGS__) + + +/* LD_PRELOAD */ + +/* Load the function name using dlsym() if necessary and store it in pointer. + * Terminate program on failure. */ +#define LOAD_FUNCTION(pointer, name) \ + if ((pointer) == NULL) { \ + char *error; \ + dlerror(); /* Clear possibly existing error. */ \ + \ + *(void **) (&(pointer)) = dlsym(RTLD_NEXT, (name)); \ + \ + if ((error = dlerror()) != NULL) { \ + ERROR("%s\n", error); \ + } \ + } + + +/* OTHER FUNCTIONS */ + +static struct list *find_sockfd(int sockfd) { + struct list *e; + + if (sockfd == socket_list.unix_sockfd) { + return NULL; + } + + for (e = &socket_list; e != NULL; e = e->next) { + if (e->unix_sockfd == sockfd) { + return e; + } + } + return NULL; +} +static struct list *remove_sockfd(int sockfd) { + struct list *e, *p; + + if (sockfd == socket_list.unix_sockfd) { + return NULL; + } + + for (e = &socket_list, p = NULL; e != NULL; p = e, e = e->next) { + if (e->unix_sockfd == sockfd) { + p->next = e->next; + return e; + } + } + return NULL; +} + +static const char *get_socket_path(void) { + const char *path = getenv("SOCKET2UNIX_PATH"); + if (!path) { + ERROR("SOCKET2UNIX_PATH environment variable not defined\n"); + } + if (path[0] != '/') { + ERROR("SOCKET2UNIX_PATH '%s' must be an absolute path\n", path); + } + return path; +} +static int get_log_level(void) { + const char *level = getenv("SOCKET2UNIX_DEBUG"); + if (!level) { + return LOG_LEVEL_WARNING; + } + int number = atoi(level); + if (number <= 0 || number > LOG_LEVEL_DEBUG) { + number = LOG_LEVEL_DEBUG; + } + return number; +} + +static const char *af_to_name(int af) { + if (af == AF_UNIX) { + return "AF_UNIX"; + } else if (af == AF_LOCAL) { + return "AF_LOCAL"; + } else if (af == AF_INET) { + return "AF_INET"; + } else if (af == AF_INET6) { + return "AF_INET6"; + } else if (af == AF_IPX) { + return "AF_IPX"; + } else if (af == AF_NETLINK) { + return "AF_NETLINK"; + } else if (af == AF_X25) { + return "AF_X25"; + } else if (af == AF_AX25) { + return "AF_AX25"; + } else if (af == AF_ATMPVC) { + return "AF_ATMPVC"; + } else if (af == AF_APPLETALK) { + return "AF_APPLETALK"; + } else if (af == AF_PACKET) { + return "AF_PACKET"; + } else { + return "AF_UNKNOWN"; + } +} +static const char *sock_to_name(int sock) { + if (sock & SOCK_STREAM) { + return "SOCK_STREAM"; + } else if (sock & SOCK_DGRAM) { + return "SOCK_DGRAM"; + } else if (sock & SOCK_SEQPACKET) { + return "SOCK_SEQPACKET"; + } else if (sock & SOCK_RAW) { + return "SOCK_RAW"; + } else if (sock & SOCK_RDM) { + return "SOCK_RDM"; + } else if (sock & SOCK_PACKET) { + return "SOCK_PACKET"; + } else { + return "SOCK_UNKNOWN"; + } +} +/* for getsockopt()/setsockopt(). */ +static const char *level_to_name(int level) { + if (level == SOL_SOCKET) { + return "SOL_SOCKET"; + } else if (level == SOL_IP) { + return "SOL_IP"; + } else if (level == SOL_IPV6) { + return "SOL_IPV6"; + } else if (level == IPPROTO_TCP) { + return "IPPROTO_TCP"; + } else if (level == IPPROTO_UDP) { + return "IPPROTO_UDP"; + } else { + return "SOL_UNKNOWN"; + } +} + + +static int set_sockaddr_un(struct sockaddr_un *sockaddr, + const struct sockaddr *addr, socklen_t addrlen) { + /* Just in case ... */ + if ((addr->sa_family == AF_INET + && addrlen < sizeof(struct sockaddr_in)) + || (addr->sa_family == AF_INET6 + && addrlen < sizeof(struct sockaddr_in6))) { + WARN("invalid addrlen from program\n"); + return -1; + } + + const char *socket_path = get_socket_path(); + + /* The program may open multiple sockets, e.g. IPv4 and IPv6 and on + * multiple ports. Create unique paths. */ + const char *af; + int port; + if (addr->sa_family == AF_INET) { + af = "v4"; + port = ntohs(((struct sockaddr_in *)addr)->sin_port); + } else if (addr->sa_family == AF_INET6) { + af = "v6"; + port = ntohs(((struct sockaddr_in6 *)addr)->sin6_port); + } else { + af = "unknown"; + port = 0; + WARN("unknown sa_family '%s' (%d)\n", + af_to_name(addr->sa_family), addr->sa_family); + } + + /* Initialize sockaddr_un. */ + sockaddr->sun_family = AF_UNIX; + int written = snprintf(sockaddr->sun_path, sizeof(sockaddr->sun_path), + "%s-%s-%d", socket_path, af, port); + /* The maximum length is quite short, check it. */ + if (written >= (int)sizeof(sockaddr->sun_path)) { + ERROR("path '%s-%s-%d' too long for UNIX socket", + socket_path, af, port); + } + + return 0; +} + + +/* FUNCTIONS OVERWRITTEN BY LD_PRELOAD */ + +int socket(int domain, int type, int protocol) { + static int (*real_socket)(int, int, int); + LOAD_FUNCTION(real_socket, "socket"); + + if (domain == AF_UNIX || domain == AF_LOCAL) { + return real_socket(domain, type, protocol); + } + + DEBUG("socket(%s, %s, %d)\n", + af_to_name(domain), sock_to_name(type), protocol); + + /* We must return the replacement socket in case the program uses select() + * or similar on it. */ + + int unix_sockfd = real_socket(AF_UNIX, type, 0); + if (unix_sockfd < 0) { + DIE("bind(): failed to create UNIX socket"); + } + + struct list *entry = malloc(sizeof(*entry)); + if (!entry) { + DIE("socket(): malloc"); + } + memset(entry, 0, sizeof(*entry)); + + entry->unix_sockfd = unix_sockfd; + entry->orig_domain = domain; + entry->orig_type = type; + + entry->next = socket_list.next; + socket_list.next = entry; + + return unix_sockfd; +} + +int close(int fd) { + static int (*real_close)(int); + LOAD_FUNCTION(real_close, "close"); + + DEBUG("close(%d)\n", fd); + + struct list *entry = remove_sockfd(fd); + if (entry == NULL) { + DEBUG("close(%d): sockfd not found\n", fd); + return real_close(fd); + } + assert(fd == entry->unix_sockfd); + free(entry); + + return real_close(fd); +} + +int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen) { + static int (*real_bind)(int, const struct sockaddr *, socklen_t); + LOAD_FUNCTION(real_bind, "bind"); + + DEBUG("bind(%d, ..)\n", sockfd); + + if (addr == NULL || addrlen < sizeof(addr->sa_family) + || addr->sa_family == AF_UNIX + || addr->sa_family == AF_LOCAL) { + return real_bind(sockfd, addr, addrlen); + } + + struct list *entry = find_sockfd(sockfd); + if (!entry) { + DEBUG("bind(%d, ..): sockfd not found\n", sockfd); + return real_bind(sockfd, addr, addrlen); + } + assert(sockfd == entry->unix_sockfd); + DEBUG("bind(%d, ..): %s %s\n", + sockfd, + af_to_name(entry->orig_domain), + sock_to_name(entry->orig_type)); + + struct sockaddr_un sockaddr; + if (set_sockaddr_un(&sockaddr, addr, addrlen) != 0) { + ERROR("connect(%d, ..) failed\n", sockfd); + } + + DEBUG("bind(%d, ..): using path '%s'\n", sockfd, sockaddr.sun_path); + + int attempts = 0; + while (attempts < 10) { + if (real_bind(entry->unix_sockfd, (struct sockaddr *)&sockaddr, + sizeof(sockaddr)) == 0) { + /* Success. */ + return 0; + } + if (errno != EADDRINUSE) { + DIE("bind(%d, ..): failed to bind to '%s'", + sockfd, sockaddr.sun_path); + } + + /* File already exists, unlink it if it's a socket. This has a race + * condition, but the worst case is that we delete a file created by + * the user at the path he told us to use. Tough luck .. */ + + struct stat buf; + if (lstat(sockaddr.sun_path, &buf) != 0) { + /* Looks like a race, better abort. */ + DIE("bind(%d, ..): lstat on UNIX socket '%s' failed", + sockfd, sockaddr.sun_path); + } + + if (!S_ISSOCK(buf.st_mode)) { + ERROR("bind(%d, ..): path '%s' exits and is no socket\n", + sockfd, sockaddr.sun_path); + } + + WARN("bind(%d, ..): unlinking '%s'\n", sockfd, sockaddr.sun_path); + if (unlink(sockaddr.sun_path) != 0) { + DIE("bind(%d, ..): unlink '%s' failed", + sockfd, sockaddr.sun_path); + } + + attempts++; + } + + ERROR("bind(%d, ..): failed to create UNIX socket file\n", sockfd); + return -1; /* never reached */ +} + +int listen(int sockfd, int backlog) { + static int (*real_listen)(int, int); + LOAD_FUNCTION(real_listen, "listen"); + + DEBUG("listen(%d, %d)\n", sockfd, backlog); + + struct list *entry = find_sockfd(sockfd); + if (!entry) { + DEBUG("listen(%d, %d): sockfd not found\n", sockfd, backlog); + return real_listen(sockfd, backlog); + } + assert(sockfd == entry->unix_sockfd); + DEBUG("listen(%d, %d): %s %s\n", + sockfd, backlog, + af_to_name(entry->orig_domain), + sock_to_name(entry->orig_type)); + + if (real_listen(entry->unix_sockfd, backlog) != 0) { + DIE("listen(): failed to listen"); + } + + return 0; +} + +int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen) { + static int (*real_accept)(int, struct sockaddr *, socklen_t *); + LOAD_FUNCTION(real_accept, "accept"); + + DEBUG("accept(%d, ..)\n", sockfd); + + struct list *entry = find_sockfd(sockfd); + if (!entry) { + DEBUG("accept(%d, ..): sockfd not found\n", sockfd); + return real_accept(sockfd, addr, addrlen); + } + assert(sockfd == entry->unix_sockfd); + DEBUG("accept(%d, ..): %s %s\n", + sockfd, + af_to_name(entry->orig_domain), + sock_to_name(entry->orig_type)); + + struct sockaddr_un sockaddr; + socklen_t size = sizeof(sockaddr); + int sock = real_accept(entry->unix_sockfd, (struct sockaddr *)&sockaddr, + &size); + if (sock < 0) { + DIE("accept(%d, ..): failed to accept", sockfd); + } + + if (addr == NULL || addrlen == NULL) { + return sock; + } + DEBUG("accept(%d, ..): caller requested sockaddr\n", sockfd); + + if (*addrlen < size) { + WARN("accept(%d, ..): invalid addrlen from program", sockfd); + errno = EINVAL; + return -1; + } + + /* This is not the protocol the program asked for (AF_* vs. AF_UNIX), but + * it should work most of the time. */ + memcpy(addr, &sockaddr, size); + *addrlen = size; + + /* TODO: is this enough? */ + + return sock; +} + +int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) { + static int (*real_connect)(int, const struct sockaddr *, socklen_t); + LOAD_FUNCTION(real_connect, "connect"); + + DEBUG("connect(%d, ..)\n", sockfd); + + if (addr == NULL || addrlen < sizeof(addr->sa_family) + || addr->sa_family == AF_UNIX + || addr->sa_family == AF_LOCAL) { + return real_connect(sockfd, addr, addrlen); + } + + struct list *entry = find_sockfd(sockfd); + if (!entry) { + DEBUG("connect(%d, ..): sockfd not found\n", sockfd); + return real_connect(sockfd, addr, addrlen); + } + assert(sockfd == entry->unix_sockfd); + DEBUG("connect(%d, ..): %s %s\n", + sockfd, + af_to_name(entry->orig_domain), + sock_to_name(entry->orig_type)); + + struct sockaddr_un sockaddr; + if (set_sockaddr_un(&sockaddr, addr, addrlen) != 0) { + ERROR("connect(%d, ..) failed\n", sockfd); + } + + DEBUG("connect(%d, ..): using path '%s'\n", sockfd, sockaddr.sun_path); + + if (real_connect(entry->unix_sockfd, (struct sockaddr *)&sockaddr, + sizeof(sockaddr)) != 0) { + DIE("connect(%d, ..): failed to connect", sockfd); + } + + return 0; +} + + +int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen) { + static int (*real_getsockname)(int, struct sockaddr *, socklen_t *); + LOAD_FUNCTION(real_getsockname, "getsockname"); + + DEBUG("getsockname(%d, ..)\n", sockfd); + + return real_getsockname(sockfd, addr, addrlen); +} + +int getpeername(int sockfd, struct sockaddr *addr, socklen_t *addrlen) { + static int (*real_getpeername)(int, struct sockaddr *, socklen_t *); + LOAD_FUNCTION(real_getpeername, "getpeername"); + + DEBUG("getpeername(%d, ..)\n", sockfd); + + return real_getpeername(sockfd, addr, addrlen); +} + +int getsockopt(int sockfd, int level, int optname, void *optval, socklen_t *optlen) { + static int (*real_getsockopt)(int, int, int, void *, socklen_t *); + LOAD_FUNCTION(real_getsockopt, "getsockopt"); + + DEBUG("getsockopt(%d, %d %s, %d, ..)\n", + sockfd, + level, level_to_name(level), + optname); + + return real_getsockopt(sockfd, level, optname, optval, optlen); +} +int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen) { + static int (*real_setsockopt)(int, int, int, const void *, socklen_t); + LOAD_FUNCTION(real_setsockopt, "setsockopt"); + + DEBUG("setsockopt(%d, %d %s, %d, ..)\n", + sockfd, + level, level_to_name(level), + optname); + + return real_setsockopt(sockfd, level, optname, optval, optlen); +} -- 2.43.2