Keith Burns (alagalah) | b327c2b | 2017-10-09 08:52:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016 Cisco and/or its affiliates. |
| 3 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | * you may not use this file except in compliance with the License. |
| 5 | * You may obtain a copy of the License at: |
| 6 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 9 | * Unless required by applicable law or agreed to in writing, software |
| 10 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | * See the License for the specific language governing permissions and |
| 13 | * limitations under the License. |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * Copyright (c) 2005-2008 Jelmer Vernooij <jelmer@samba.org> |
| 18 | * Copyright (C) 2006-2014 Stefan Metzmacher <metze@samba.org> |
| 19 | * Copyright (C) 2013-2014 Andreas Schneider <asn@samba.org> |
| 20 | * |
| 21 | * All rights reserved. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * |
| 27 | * 1. Redistributions of source code must retain the above copyright |
| 28 | * notice, this list of conditions and the following disclaimer. |
| 29 | * |
| 30 | * 2. Redistributions in binary form must reproduce the above copyright |
| 31 | * notice, this list of conditions and the following disclaimer in the |
| 32 | * documentation and/or other materials provided with the distribution. |
| 33 | * |
| 34 | * 3. Neither the name of the author nor the names of its contributors |
| 35 | * may be used to endorse or promote products derived from this software |
| 36 | * without specific prior written permission. |
| 37 | * |
| 38 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 39 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 41 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 42 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 43 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 44 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 45 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 46 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 47 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 48 | * SUCH DAMAGE. |
| 49 | * |
| 50 | */ |
| 51 | |
| 52 | /* |
| 53 | Socket wrapper library. Passes all socket communication over |
| 54 | unix domain sockets if the environment variable SOCKET_WRAPPER_DIR |
| 55 | is set. |
| 56 | */ |
| 57 | |
| 58 | #include <signal.h> |
| 59 | #include <dlfcn.h> |
| 60 | |
| 61 | #include <stdio.h> |
| 62 | #include <stdarg.h> |
| 63 | #include <unistd.h> |
| 64 | #include <pthread.h> |
| 65 | |
| 66 | #include <libvcl-ldpreload/vcom_socket_wrapper.h> |
| 67 | |
| 68 | |
| 69 | enum swrap_dbglvl_e |
| 70 | { |
| 71 | SWRAP_LOG_ERROR = 0, |
| 72 | SWRAP_LOG_WARN, |
| 73 | SWRAP_LOG_DEBUG, |
| 74 | SWRAP_LOG_TRACE |
| 75 | }; |
| 76 | |
| 77 | |
| 78 | /* Macros for accessing mutexes */ |
| 79 | #define SWRAP_LOCK(m) do { \ |
| 80 | pthread_mutex_lock(&(m ## _mutex)); \ |
| 81 | } while(0) |
| 82 | |
| 83 | #define SWRAP_UNLOCK(m) do { \ |
| 84 | pthread_mutex_unlock(&(m ## _mutex)); \ |
| 85 | } while(0) |
| 86 | |
| 87 | /* Add new global locks here please */ |
| 88 | #define SWRAP_LOCK_ALL \ |
| 89 | SWRAP_LOCK(libc_symbol_binding); \ |
| 90 | |
| 91 | #define SWRAP_UNLOCK_ALL \ |
| 92 | SWRAP_UNLOCK(libc_symbol_binding); \ |
| 93 | |
| 94 | |
| 95 | |
| 96 | /* The mutex for accessing the global libc.symbols */ |
| 97 | static pthread_mutex_t libc_symbol_binding_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 98 | |
| 99 | /* Function prototypes */ |
| 100 | |
| 101 | #ifdef NDEBUG |
| 102 | #define SWRAP_LOG(...) |
| 103 | #else |
| 104 | static void |
| 105 | swrap_log (enum swrap_dbglvl_e dbglvl, const char *func, |
| 106 | const char *format, ...) |
| 107 | PRINTF_ATTRIBUTE (3, 4); |
| 108 | #define SWRAP_LOG(dbglvl, ...) swrap_log((dbglvl), __func__, __VA_ARGS__) |
| 109 | |
| 110 | static void |
| 111 | swrap_log (enum swrap_dbglvl_e dbglvl, |
| 112 | const char *func, const char *format, ...) |
| 113 | { |
| 114 | char buffer[1024]; |
| 115 | va_list va; |
| 116 | unsigned int lvl = SWRAP_LOG_WARN; |
| 117 | |
| 118 | va_start (va, format); |
| 119 | vsnprintf (buffer, sizeof (buffer), format, va); |
| 120 | va_end (va); |
| 121 | |
| 122 | if (lvl >= dbglvl) |
| 123 | { |
| 124 | switch (dbglvl) |
| 125 | { |
| 126 | case SWRAP_LOG_ERROR: |
| 127 | fprintf (stderr, |
| 128 | "SWRAP_ERROR(%d) - %s: %s\n", |
| 129 | (int) getpid (), func, buffer); |
| 130 | break; |
| 131 | case SWRAP_LOG_WARN: |
| 132 | fprintf (stderr, |
| 133 | "SWRAP_WARN(%d) - %s: %s\n", |
| 134 | (int) getpid (), func, buffer); |
| 135 | break; |
| 136 | case SWRAP_LOG_DEBUG: |
| 137 | fprintf (stderr, |
| 138 | "SWRAP_DEBUG(%d) - %s: %s\n", |
| 139 | (int) getpid (), func, buffer); |
| 140 | break; |
| 141 | case SWRAP_LOG_TRACE: |
| 142 | fprintf (stderr, |
| 143 | "SWRAP_TRACE(%d) - %s: %s\n", |
| 144 | (int) getpid (), func, buffer); |
| 145 | break; |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | #endif |
| 150 | |
| 151 | |
| 152 | /********************************************************* |
| 153 | * SWRAP LOADING LIBC FUNCTIONS |
| 154 | *********************************************************/ |
| 155 | |
| 156 | #ifdef HAVE_ACCEPT4 |
| 157 | typedef int (*__libc_accept4) (int sockfd, |
| 158 | struct sockaddr * addr, |
| 159 | socklen_t * addrlen, int flags); |
| 160 | #else |
| 161 | typedef int (*__libc_accept) (int sockfd, |
| 162 | struct sockaddr * addr, socklen_t * addrlen); |
| 163 | #endif |
| 164 | typedef int (*__libc_bind) (int sockfd, |
| 165 | const struct sockaddr * addr, socklen_t addrlen); |
| 166 | typedef int (*__libc_close) (int fd); |
| 167 | typedef int (*__libc_connect) (int sockfd, |
| 168 | const struct sockaddr * addr, |
| 169 | socklen_t addrlen); |
| 170 | |
| 171 | #if 0 |
| 172 | /* TBD: dup and dup2 to be implemented later */ |
| 173 | typedef int (*__libc_dup) (int fd); |
| 174 | typedef int (*__libc_dup2) (int oldfd, int newfd); |
| 175 | #endif |
| 176 | |
| 177 | typedef int (*__libc_fcntl) (int fd, int cmd, ...); |
| 178 | typedef FILE *(*__libc_fopen) (const char *name, const char *mode); |
| 179 | #ifdef HAVE_FOPEN64 |
| 180 | typedef FILE *(*__libc_fopen64) (const char *name, const char *mode); |
| 181 | #endif |
| 182 | #ifdef HAVE_EVENTFD |
| 183 | typedef int (*__libc_eventfd) (int count, int flags); |
| 184 | #endif |
| 185 | typedef int (*__libc_getpeername) (int sockfd, |
| 186 | struct sockaddr * addr, |
| 187 | socklen_t * addrlen); |
| 188 | typedef int (*__libc_getsockname) (int sockfd, |
| 189 | struct sockaddr * addr, |
| 190 | socklen_t * addrlen); |
| 191 | typedef int (*__libc_getsockopt) (int sockfd, |
| 192 | int level, |
| 193 | int optname, |
| 194 | void *optval, socklen_t * optlen); |
| 195 | typedef int (*__libc_ioctl) (int d, unsigned long int request, ...); |
| 196 | typedef int (*__libc_listen) (int sockfd, int backlog); |
| 197 | typedef int (*__libc_open) (const char *pathname, int flags, mode_t mode); |
| 198 | #ifdef HAVE_OPEN64 |
| 199 | typedef int (*__libc_open64) (const char *pathname, int flags, mode_t mode); |
| 200 | #endif /* HAVE_OPEN64 */ |
| 201 | typedef int (*__libc_openat) (int dirfd, const char *path, int flags, ...); |
| 202 | typedef int (*__libc_pipe) (int pipefd[2]); |
| 203 | typedef int (*__libc_read) (int fd, void *buf, size_t count); |
| 204 | typedef ssize_t (*__libc_readv) (int fd, const struct iovec * iov, |
| 205 | int iovcnt); |
| 206 | typedef int (*__libc_recv) (int sockfd, void *buf, size_t len, int flags); |
| 207 | typedef int (*__libc_recvfrom) (int sockfd, |
| 208 | void *buf, |
| 209 | size_t len, |
| 210 | int flags, |
| 211 | struct sockaddr * src_addr, |
| 212 | socklen_t * addrlen); |
| 213 | typedef int (*__libc_recvmsg) (int sockfd, const struct msghdr * msg, |
| 214 | int flags); |
| 215 | typedef int (*__libc_send) (int sockfd, const void *buf, size_t len, |
| 216 | int flags); |
| 217 | typedef int (*__libc_sendmsg) (int sockfd, const struct msghdr * msg, |
| 218 | int flags); |
| 219 | typedef int (*__libc_sendto) (int sockfd, const void *buf, size_t len, |
| 220 | int flags, const struct sockaddr * dst_addr, |
| 221 | socklen_t addrlen); |
| 222 | typedef int (*__libc_setsockopt) (int sockfd, int level, int optname, |
| 223 | const void *optval, socklen_t optlen); |
| 224 | #ifdef HAVE_SIGNALFD |
| 225 | typedef int (*__libc_signalfd) (int fd, const sigset_t * mask, int flags); |
| 226 | #endif |
| 227 | typedef int (*__libc_socket) (int domain, int type, int protocol); |
| 228 | typedef int (*__libc_socketpair) (int domain, int type, int protocol, |
| 229 | int sv[2]); |
| 230 | #ifdef HAVE_TIMERFD_CREATE |
| 231 | typedef int (*__libc_timerfd_create) (int clockid, int flags); |
| 232 | #endif |
| 233 | typedef ssize_t (*__libc_write) (int fd, const void *buf, size_t count); |
| 234 | typedef ssize_t (*__libc_writev) (int fd, const struct iovec * iov, |
| 235 | int iovcnt); |
| 236 | |
| 237 | typedef int (*__libc_shutdown) (int fd, int how); |
| 238 | |
| 239 | typedef int (*__libc_select) (int __nfds, fd_set * __restrict __readfds, |
| 240 | fd_set * __restrict __writefds, |
| 241 | fd_set * __restrict __exceptfds, |
| 242 | struct timeval * __restrict __timeout); |
| 243 | |
| 244 | #ifdef __USE_XOPEN2K |
| 245 | typedef int (*__libc_pselect) (int __nfds, fd_set * __restrict __readfds, |
| 246 | fd_set * __restrict __writefds, |
| 247 | fd_set * __restrict __exceptfds, |
| 248 | const struct timespec * __restrict __timeout, |
| 249 | const __sigset_t * __restrict __sigmask); |
| 250 | #endif |
| 251 | |
| 252 | typedef int (*__libc_epoll_create) (int __size); |
| 253 | |
| 254 | typedef int (*__libc_epoll_create1) (int __flags); |
| 255 | |
| 256 | typedef int (*__libc_epoll_ctl) (int __epfd, int __op, int __fd, |
| 257 | struct epoll_event * __event); |
| 258 | |
| 259 | typedef int (*__libc_epoll_wait) (int __epfd, struct epoll_event * __events, |
| 260 | int __maxevents, int __timeout); |
| 261 | |
| 262 | typedef int (*__libc_epoll_pwait) (int __epfd, struct epoll_event * __events, |
| 263 | int __maxevents, int __timeout, |
| 264 | const __sigset_t * __ss); |
| 265 | |
| 266 | |
| 267 | #define SWRAP_SYMBOL_ENTRY(i) \ |
| 268 | union { \ |
| 269 | __libc_##i f; \ |
| 270 | void *obj; \ |
| 271 | } _libc_##i |
| 272 | |
| 273 | struct swrap_libc_symbols |
| 274 | { |
| 275 | #ifdef HAVE_ACCEPT4 |
| 276 | SWRAP_SYMBOL_ENTRY (accept4); |
| 277 | #else |
| 278 | SWRAP_SYMBOL_ENTRY (accept); |
| 279 | #endif |
| 280 | SWRAP_SYMBOL_ENTRY (bind); |
| 281 | SWRAP_SYMBOL_ENTRY (close); |
| 282 | SWRAP_SYMBOL_ENTRY (connect); |
| 283 | #if 0 |
| 284 | /* TBD: dup and dup2 to be implemented later */ |
| 285 | SWRAP_SYMBOL_ENTRY (dup); |
| 286 | SWRAP_SYMBOL_ENTRY (dup2); |
| 287 | #endif |
| 288 | SWRAP_SYMBOL_ENTRY (fcntl); |
| 289 | SWRAP_SYMBOL_ENTRY (fopen); |
| 290 | #ifdef HAVE_FOPEN64 |
| 291 | SWRAP_SYMBOL_ENTRY (fopen64); |
| 292 | #endif |
| 293 | #ifdef HAVE_EVENTFD |
| 294 | SWRAP_SYMBOL_ENTRY (eventfd); |
| 295 | #endif |
| 296 | SWRAP_SYMBOL_ENTRY (getpeername); |
| 297 | SWRAP_SYMBOL_ENTRY (getsockname); |
| 298 | SWRAP_SYMBOL_ENTRY (getsockopt); |
| 299 | SWRAP_SYMBOL_ENTRY (ioctl); |
| 300 | SWRAP_SYMBOL_ENTRY (listen); |
| 301 | SWRAP_SYMBOL_ENTRY (open); |
| 302 | #ifdef HAVE_OPEN64 |
| 303 | SWRAP_SYMBOL_ENTRY (open64); |
| 304 | #endif |
| 305 | SWRAP_SYMBOL_ENTRY (openat); |
| 306 | SWRAP_SYMBOL_ENTRY (pipe); |
| 307 | SWRAP_SYMBOL_ENTRY (read); |
| 308 | SWRAP_SYMBOL_ENTRY (readv); |
| 309 | SWRAP_SYMBOL_ENTRY (recv); |
| 310 | SWRAP_SYMBOL_ENTRY (recvfrom); |
| 311 | SWRAP_SYMBOL_ENTRY (recvmsg); |
| 312 | SWRAP_SYMBOL_ENTRY (send); |
| 313 | SWRAP_SYMBOL_ENTRY (sendmsg); |
| 314 | SWRAP_SYMBOL_ENTRY (sendto); |
| 315 | SWRAP_SYMBOL_ENTRY (setsockopt); |
| 316 | #ifdef HAVE_SIGNALFD |
| 317 | SWRAP_SYMBOL_ENTRY (signalfd); |
| 318 | #endif |
| 319 | SWRAP_SYMBOL_ENTRY (socket); |
| 320 | SWRAP_SYMBOL_ENTRY (socketpair); |
| 321 | #ifdef HAVE_TIMERFD_CREATE |
| 322 | SWRAP_SYMBOL_ENTRY (timerfd_create); |
| 323 | #endif |
| 324 | SWRAP_SYMBOL_ENTRY (write); |
| 325 | SWRAP_SYMBOL_ENTRY (writev); |
| 326 | |
| 327 | SWRAP_SYMBOL_ENTRY (shutdown); |
| 328 | SWRAP_SYMBOL_ENTRY (select); |
| 329 | #ifdef __USE_XOPEN2K |
| 330 | SWRAP_SYMBOL_ENTRY (pselect); |
| 331 | #endif |
| 332 | SWRAP_SYMBOL_ENTRY (epoll_create); |
| 333 | SWRAP_SYMBOL_ENTRY (epoll_create1); |
| 334 | SWRAP_SYMBOL_ENTRY (epoll_ctl); |
| 335 | SWRAP_SYMBOL_ENTRY (epoll_wait); |
| 336 | SWRAP_SYMBOL_ENTRY (epoll_pwait); |
| 337 | }; |
| 338 | |
| 339 | struct swrap |
| 340 | { |
| 341 | struct |
| 342 | { |
| 343 | void *handle; |
| 344 | void *socket_handle; |
| 345 | struct swrap_libc_symbols symbols; |
| 346 | } libc; |
| 347 | }; |
| 348 | |
| 349 | static struct swrap swrap; |
| 350 | |
| 351 | #define LIBC_NAME "libc.so" |
| 352 | |
| 353 | enum swrap_lib |
| 354 | { |
| 355 | SWRAP_LIBC, |
| 356 | }; |
| 357 | |
| 358 | #ifndef NDEBUG |
| 359 | static const char * |
| 360 | swrap_str_lib (enum swrap_lib lib) |
| 361 | { |
| 362 | switch (lib) |
| 363 | { |
| 364 | case SWRAP_LIBC: |
| 365 | return "libc"; |
| 366 | } |
| 367 | |
| 368 | /* Compiler would warn us about unhandled enum value if we get here */ |
| 369 | return "unknown"; |
| 370 | } |
| 371 | #endif |
| 372 | |
| 373 | static void * |
| 374 | swrap_load_lib_handle (enum swrap_lib lib) |
| 375 | { |
| 376 | int flags = RTLD_LAZY; |
| 377 | void *handle = NULL; |
| 378 | int i; |
| 379 | |
| 380 | #ifdef RTLD_DEEPBIND |
| 381 | flags |= RTLD_DEEPBIND; |
| 382 | #endif |
| 383 | |
| 384 | switch (lib) |
| 385 | { |
| 386 | case SWRAP_LIBC: |
| 387 | handle = swrap.libc.handle; |
| 388 | #ifdef LIBC_SO |
| 389 | if (handle == NULL) |
| 390 | { |
| 391 | handle = dlopen (LIBC_SO, flags); |
| 392 | |
| 393 | swrap.libc.handle = handle; |
| 394 | } |
| 395 | #endif |
| 396 | if (handle == NULL) |
| 397 | { |
| 398 | for (i = 10; i >= 0; i--) |
| 399 | { |
| 400 | char soname[256] = { 0 }; |
| 401 | |
| 402 | snprintf (soname, sizeof (soname), "libc.so.%d", i); |
| 403 | handle = dlopen (soname, flags); |
| 404 | if (handle != NULL) |
| 405 | { |
| 406 | break; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | swrap.libc.handle = handle; |
| 411 | } |
| 412 | break; |
| 413 | } |
| 414 | |
| 415 | if (handle == NULL) |
| 416 | { |
| 417 | SWRAP_LOG (SWRAP_LOG_ERROR, |
| 418 | "Failed to dlopen library: %s\n", dlerror ()); |
| 419 | exit (-1); |
| 420 | } |
| 421 | |
| 422 | return handle; |
| 423 | } |
| 424 | |
| 425 | static void * |
| 426 | _swrap_bind_symbol (enum swrap_lib lib, const char *fn_name) |
| 427 | { |
| 428 | void *handle; |
| 429 | void *func; |
| 430 | |
| 431 | handle = swrap_load_lib_handle (lib); |
| 432 | |
| 433 | func = dlsym (handle, fn_name); |
| 434 | if (func == NULL) |
| 435 | { |
| 436 | SWRAP_LOG (SWRAP_LOG_ERROR, |
| 437 | "Failed to find %s: %s\n", fn_name, dlerror ()); |
| 438 | exit (-1); |
| 439 | } |
| 440 | |
| 441 | SWRAP_LOG (SWRAP_LOG_TRACE, |
| 442 | "Loaded %s from %s", fn_name, swrap_str_lib (lib)); |
| 443 | |
| 444 | return func; |
| 445 | } |
| 446 | |
| 447 | #define swrap_bind_symbol_libc(sym_name) \ |
| 448 | SWRAP_LOCK(libc_symbol_binding); \ |
| 449 | if (swrap.libc.symbols._libc_##sym_name.obj == NULL) { \ |
| 450 | swrap.libc.symbols._libc_##sym_name.obj = \ |
| 451 | _swrap_bind_symbol(SWRAP_LIBC, #sym_name); \ |
| 452 | } \ |
| 453 | SWRAP_UNLOCK(libc_symbol_binding) |
| 454 | |
| 455 | /* |
| 456 | * IMPORTANT |
| 457 | * |
| 458 | * Functions especially from libc need to be loaded individually, you can't load |
| 459 | * all at once or gdb will segfault at startup. The same applies to valgrind and |
| 460 | * has probably something todo with with the linker. |
| 461 | * So we need load each function at the point it is called the first time. |
| 462 | */ |
| 463 | #ifdef HAVE_ACCEPT4 |
| 464 | int |
| 465 | libc_accept4 (int sockfd, |
| 466 | struct sockaddr *addr, socklen_t * addrlen, int flags) |
| 467 | { |
| 468 | swrap_bind_symbol_libc (accept4); |
| 469 | |
| 470 | return swrap.libc.symbols._libc_accept4.f (sockfd, addr, addrlen, flags); |
| 471 | } |
| 472 | |
| 473 | #else /* HAVE_ACCEPT4 */ |
| 474 | |
| 475 | int |
| 476 | libc_accept (int sockfd, struct sockaddr *addr, socklen_t * addrlen) |
| 477 | { |
| 478 | swrap_bind_symbol_libc (accept); |
| 479 | |
| 480 | return swrap.libc.symbols._libc_accept.f (sockfd, addr, addrlen); |
| 481 | } |
| 482 | #endif /* HAVE_ACCEPT4 */ |
| 483 | |
| 484 | int |
| 485 | libc_bind (int sockfd, const struct sockaddr *addr, socklen_t addrlen) |
| 486 | { |
| 487 | swrap_bind_symbol_libc (bind); |
| 488 | |
| 489 | return swrap.libc.symbols._libc_bind.f (sockfd, addr, addrlen); |
| 490 | } |
| 491 | |
| 492 | int |
| 493 | libc_close (int fd) |
| 494 | { |
| 495 | swrap_bind_symbol_libc (close); |
| 496 | |
| 497 | return swrap.libc.symbols._libc_close.f (fd); |
| 498 | } |
| 499 | |
| 500 | int |
| 501 | libc_connect (int sockfd, const struct sockaddr *addr, socklen_t addrlen) |
| 502 | { |
| 503 | swrap_bind_symbol_libc (connect); |
| 504 | |
| 505 | return swrap.libc.symbols._libc_connect.f (sockfd, addr, addrlen); |
| 506 | } |
| 507 | |
| 508 | #if 0 |
| 509 | /* TBD: dup and dup2 to be implemented later */ |
| 510 | int |
| 511 | libc_dup (int fd) |
| 512 | { |
| 513 | swrap_bind_symbol_libc (dup); |
| 514 | |
| 515 | return swrap.libc.symbols._libc_dup.f (fd); |
| 516 | } |
| 517 | |
| 518 | int |
| 519 | libc_dup2 (int oldfd, int newfd) |
| 520 | { |
| 521 | swrap_bind_symbol_libc (dup2); |
| 522 | |
| 523 | return swrap.libc.symbols._libc_dup2.f (oldfd, newfd); |
| 524 | } |
| 525 | #endif |
| 526 | |
| 527 | #ifdef HAVE_EVENTFD |
| 528 | int |
| 529 | libc_eventfd (int count, int flags) |
| 530 | { |
| 531 | swrap_bind_symbol_libc (eventfd); |
| 532 | |
| 533 | return swrap.libc.symbols._libc_eventfd.f (count, flags); |
| 534 | } |
| 535 | #endif |
| 536 | |
| 537 | DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE int |
| 538 | libc_vfcntl (int fd, int cmd, va_list ap) |
| 539 | { |
| 540 | long int args[4]; |
| 541 | int rc; |
| 542 | int i; |
| 543 | |
| 544 | swrap_bind_symbol_libc (fcntl); |
| 545 | |
| 546 | for (i = 0; i < 4; i++) |
| 547 | { |
| 548 | args[i] = va_arg (ap, long int); |
| 549 | } |
| 550 | |
| 551 | rc = swrap.libc.symbols._libc_fcntl.f (fd, |
| 552 | cmd, |
| 553 | args[0], args[1], args[2], args[3]); |
| 554 | |
| 555 | return rc; |
| 556 | } |
| 557 | |
| 558 | int |
| 559 | libc_getpeername (int sockfd, struct sockaddr *addr, socklen_t * addrlen) |
| 560 | { |
| 561 | swrap_bind_symbol_libc (getpeername); |
| 562 | |
| 563 | return swrap.libc.symbols._libc_getpeername.f (sockfd, addr, addrlen); |
| 564 | } |
| 565 | |
| 566 | int |
| 567 | libc_getsockname (int sockfd, struct sockaddr *addr, socklen_t * addrlen) |
| 568 | { |
| 569 | swrap_bind_symbol_libc (getsockname); |
| 570 | |
| 571 | return swrap.libc.symbols._libc_getsockname.f (sockfd, addr, addrlen); |
| 572 | } |
| 573 | |
| 574 | int |
| 575 | libc_getsockopt (int sockfd, |
| 576 | int level, int optname, void *optval, socklen_t * optlen) |
| 577 | { |
| 578 | swrap_bind_symbol_libc (getsockopt); |
| 579 | |
| 580 | return swrap.libc.symbols._libc_getsockopt.f (sockfd, |
| 581 | level, |
| 582 | optname, optval, optlen); |
| 583 | } |
| 584 | |
| 585 | int |
| 586 | libc_listen (int sockfd, int backlog) |
| 587 | { |
| 588 | swrap_bind_symbol_libc (listen); |
| 589 | |
| 590 | return swrap.libc.symbols._libc_listen.f (sockfd, backlog); |
| 591 | } |
| 592 | |
| 593 | int |
| 594 | libc_read (int fd, void *buf, size_t count) |
| 595 | { |
| 596 | swrap_bind_symbol_libc (read); |
| 597 | |
| 598 | return swrap.libc.symbols._libc_read.f (fd, buf, count); |
| 599 | } |
| 600 | |
| 601 | ssize_t |
| 602 | libc_readv (int fd, const struct iovec * iov, int iovcnt) |
| 603 | { |
| 604 | swrap_bind_symbol_libc (readv); |
| 605 | |
| 606 | return swrap.libc.symbols._libc_readv.f (fd, iov, iovcnt); |
| 607 | } |
| 608 | |
| 609 | int |
| 610 | libc_recv (int sockfd, void *buf, size_t len, int flags) |
| 611 | { |
| 612 | swrap_bind_symbol_libc (recv); |
| 613 | |
| 614 | return swrap.libc.symbols._libc_recv.f (sockfd, buf, len, flags); |
| 615 | } |
| 616 | |
| 617 | int |
| 618 | libc_recvfrom (int sockfd, |
| 619 | void *buf, |
| 620 | size_t len, |
| 621 | int flags, struct sockaddr *src_addr, socklen_t * addrlen) |
| 622 | { |
| 623 | swrap_bind_symbol_libc (recvfrom); |
| 624 | |
| 625 | return swrap.libc.symbols._libc_recvfrom.f (sockfd, |
| 626 | buf, |
| 627 | len, flags, src_addr, addrlen); |
| 628 | } |
| 629 | |
| 630 | int |
| 631 | libc_recvmsg (int sockfd, struct msghdr *msg, int flags) |
| 632 | { |
| 633 | swrap_bind_symbol_libc (recvmsg); |
| 634 | |
| 635 | return swrap.libc.symbols._libc_recvmsg.f (sockfd, msg, flags); |
| 636 | } |
| 637 | |
| 638 | int |
| 639 | libc_send (int sockfd, const void *buf, size_t len, int flags) |
| 640 | { |
| 641 | swrap_bind_symbol_libc (send); |
| 642 | |
| 643 | return swrap.libc.symbols._libc_send.f (sockfd, buf, len, flags); |
| 644 | } |
| 645 | |
| 646 | int |
| 647 | libc_sendmsg (int sockfd, const struct msghdr *msg, int flags) |
| 648 | { |
| 649 | swrap_bind_symbol_libc (sendmsg); |
| 650 | |
| 651 | return swrap.libc.symbols._libc_sendmsg.f (sockfd, msg, flags); |
| 652 | } |
| 653 | |
| 654 | int |
| 655 | libc_sendto (int sockfd, |
| 656 | const void *buf, |
| 657 | size_t len, |
| 658 | int flags, const struct sockaddr *dst_addr, socklen_t addrlen) |
| 659 | { |
| 660 | swrap_bind_symbol_libc (sendto); |
| 661 | |
| 662 | return swrap.libc.symbols._libc_sendto.f (sockfd, |
| 663 | buf, |
| 664 | len, flags, dst_addr, addrlen); |
| 665 | } |
| 666 | |
| 667 | int |
| 668 | libc_setsockopt (int sockfd, |
| 669 | int level, int optname, const void *optval, socklen_t optlen) |
| 670 | { |
| 671 | swrap_bind_symbol_libc (setsockopt); |
| 672 | |
| 673 | return swrap.libc.symbols._libc_setsockopt.f (sockfd, |
| 674 | level, |
| 675 | optname, optval, optlen); |
| 676 | } |
| 677 | |
| 678 | int |
| 679 | libc_socket (int domain, int type, int protocol) |
| 680 | { |
| 681 | swrap_bind_symbol_libc (socket); |
| 682 | |
| 683 | return swrap.libc.symbols._libc_socket.f (domain, type, protocol); |
| 684 | } |
| 685 | |
| 686 | int |
| 687 | libc_socketpair (int domain, int type, int protocol, int sv[2]) |
| 688 | { |
| 689 | swrap_bind_symbol_libc (socketpair); |
| 690 | |
| 691 | return swrap.libc.symbols._libc_socketpair.f (domain, type, protocol, sv); |
| 692 | } |
| 693 | |
| 694 | ssize_t |
| 695 | libc_write (int fd, const void *buf, size_t count) |
| 696 | { |
| 697 | swrap_bind_symbol_libc (write); |
| 698 | |
| 699 | return swrap.libc.symbols._libc_write.f (fd, buf, count); |
| 700 | } |
| 701 | |
| 702 | ssize_t |
| 703 | libc_writev (int fd, const struct iovec * iov, int iovcnt) |
| 704 | { |
| 705 | swrap_bind_symbol_libc (writev); |
| 706 | |
| 707 | return swrap.libc.symbols._libc_writev.f (fd, iov, iovcnt); |
| 708 | } |
| 709 | |
| 710 | int |
| 711 | libc_shutdown (int fd, int how) |
| 712 | { |
| 713 | swrap_bind_symbol_libc (shutdown); |
| 714 | |
| 715 | return swrap.libc.symbols._libc_shutdown.f (fd, how); |
| 716 | } |
| 717 | |
| 718 | int |
| 719 | libc_select (int __nfds, fd_set * __restrict __readfds, |
| 720 | fd_set * __restrict __writefds, |
| 721 | fd_set * __restrict __exceptfds, |
| 722 | struct timeval *__restrict __timeout) |
| 723 | { |
| 724 | swrap_bind_symbol_libc (select); |
| 725 | |
| 726 | return swrap.libc.symbols._libc_select.f (__nfds, __readfds, |
| 727 | __writefds, |
| 728 | __exceptfds, __timeout); |
| 729 | } |
| 730 | |
| 731 | #ifdef __USE_XOPEN2K |
| 732 | int |
| 733 | libc_pselect (int __nfds, fd_set * __restrict __readfds, |
| 734 | fd_set * __restrict __writefds, |
| 735 | fd_set * __restrict __exceptfds, |
| 736 | const struct timespec *__restrict __timeout, |
| 737 | const __sigset_t * __restrict __sigmask) |
| 738 | { |
| 739 | swrap_bind_symbol_libc (pselect); |
| 740 | |
| 741 | return swrap.libc.symbols._libc_pselect.f (__nfds, __readfds, |
| 742 | __writefds, |
| 743 | __exceptfds, |
| 744 | __timeout, __sigmask); |
| 745 | } |
| 746 | #endif |
| 747 | |
| 748 | int |
| 749 | libc_epoll_create (int __size) |
| 750 | { |
| 751 | swrap_bind_symbol_libc (epoll_create); |
| 752 | |
| 753 | return swrap.libc.symbols._libc_epoll_create.f (__size); |
| 754 | } |
| 755 | |
| 756 | int |
| 757 | libc_epoll_create1 (int __flags) |
| 758 | { |
| 759 | swrap_bind_symbol_libc (epoll_create1); |
| 760 | |
| 761 | return swrap.libc.symbols._libc_epoll_create1.f (__flags); |
| 762 | } |
| 763 | |
| 764 | int |
| 765 | libc_epoll_ctl (int __epfd, int __op, int __fd, struct epoll_event *__event) |
| 766 | { |
| 767 | swrap_bind_symbol_libc (epoll_ctl); |
| 768 | |
| 769 | return swrap.libc.symbols._libc_epoll_ctl.f (__epfd, __op, __fd, __event); |
| 770 | } |
| 771 | |
| 772 | int |
| 773 | libc_epoll_wait (int __epfd, struct epoll_event *__events, |
| 774 | int __maxevents, int __timeout) |
| 775 | { |
| 776 | swrap_bind_symbol_libc (epoll_wait); |
| 777 | |
| 778 | return swrap.libc.symbols._libc_epoll_wait.f (__epfd, __events, |
| 779 | __maxevents, __timeout); |
| 780 | } |
| 781 | |
| 782 | int |
| 783 | libc_epoll_pwait (int __epfd, struct epoll_event *__events, |
| 784 | int __maxevents, int __timeout, const __sigset_t * __ss) |
| 785 | { |
| 786 | swrap_bind_symbol_libc (epoll_pwait); |
| 787 | |
| 788 | return swrap.libc.symbols._libc_epoll_pwait.f (__epfd, __events, |
| 789 | __maxevents, __timeout, |
| 790 | __ss); |
| 791 | } |
| 792 | |
| 793 | static void |
| 794 | swrap_thread_prepare (void) |
| 795 | { |
| 796 | SWRAP_LOCK_ALL; |
| 797 | } |
| 798 | |
| 799 | static void |
| 800 | swrap_thread_parent (void) |
| 801 | { |
| 802 | SWRAP_UNLOCK_ALL; |
| 803 | } |
| 804 | |
| 805 | static void |
| 806 | swrap_thread_child (void) |
| 807 | { |
| 808 | SWRAP_UNLOCK_ALL; |
| 809 | } |
| 810 | |
| 811 | /**************************** |
| 812 | * CONSTRUCTOR |
| 813 | ***************************/ |
| 814 | void |
| 815 | swrap_constructor (void) |
| 816 | { |
| 817 | /* |
| 818 | * If we hold a lock and the application forks, then the child |
| 819 | * is not able to unlock the mutex and we are in a deadlock. |
| 820 | * This should prevent such deadlocks. |
| 821 | */ |
| 822 | pthread_atfork (&swrap_thread_prepare, |
| 823 | &swrap_thread_parent, &swrap_thread_child); |
| 824 | } |
| 825 | |
| 826 | /**************************** |
| 827 | * DESTRUCTOR |
| 828 | ***************************/ |
| 829 | |
| 830 | /* |
| 831 | * This function is called when the library is unloaded and makes sure that |
| 832 | * sockets get closed and the unix file for the socket are unlinked. |
| 833 | */ |
| 834 | void |
| 835 | swrap_destructor (void) |
| 836 | { |
| 837 | if (swrap.libc.handle != NULL) |
| 838 | { |
| 839 | dlclose (swrap.libc.handle); |
| 840 | } |
| 841 | if (swrap.libc.socket_handle) |
| 842 | { |
| 843 | dlclose (swrap.libc.socket_handle); |
| 844 | } |
| 845 | } |
| 846 | |
| 847 | /* |
| 848 | * fd.io coding-style-patch-verification: ON |
| 849 | * |
| 850 | * Local Variables: |
| 851 | * eval: (c-set-style "gnu") |
| 852 | * End: |
| 853 | */ |