1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "nacl_io/kernel_intercept.h" 6 7 #include <assert.h> 8 #include <errno.h> 9 #include <string.h> 10 11 #include "nacl_io/kernel_proxy.h" 12 #include "nacl_io/kernel_wrap.h" 13 #include "nacl_io/kernel_wrap_real.h" 14 #include "nacl_io/log.h" 15 #include "nacl_io/osmman.h" 16 #include "nacl_io/ossocket.h" 17 #include "nacl_io/ostime.h" 18 #include "nacl_io/pepper_interface.h" 19 #include "nacl_io/real_pepper_interface.h" 20 21 using namespace nacl_io; 22 23 #define ON_NOSYS_RETURN(x) \ 24 if (!ki_is_initialized()) { \ 25 errno = ENOSYS; \ 26 return x; \ 27 } 28 29 struct KernelInterceptState { 30 KernelProxy* kp; 31 PepperInterface* ppapi; 32 bool kp_owned; 33 }; 34 35 static KernelInterceptState s_state; 36 37 // The the test code we want to be able to save the previous kernel 38 // proxy when intialising and restore it on uninit. 39 static KernelInterceptState s_saved_state; 40 41 int ki_push_state_for_testing() { 42 assert(s_saved_state.kp == NULL); 43 if (s_saved_state.kp != NULL) 44 return 1; 45 s_saved_state = s_state; 46 s_state.kp = NULL; 47 s_state.ppapi = NULL; 48 s_state.kp_owned = false; 49 return 0; 50 } 51 52 static void ki_pop_state() { 53 // Swap out the KernelProxy. This will normally reset the 54 // proxy to NULL, aside from in test code that has called 55 // ki_push_state_for_testing(). 56 s_state = s_saved_state; 57 s_saved_state.kp = NULL; 58 s_saved_state.ppapi = NULL; 59 s_saved_state.kp_owned = false; 60 } 61 62 int ki_pop_state_for_testing() { 63 ki_pop_state(); 64 return 0; 65 } 66 67 int ki_init(void* kp) { 68 LOG_TRACE("ki_init: %p", kp); 69 return ki_init_ppapi(kp, 0, NULL); 70 } 71 72 int ki_init_ppapi(void* kp, 73 PP_Instance instance, 74 PPB_GetInterface get_browser_interface) { 75 assert(!s_state.kp); 76 if (s_state.kp != NULL) 77 return 1; 78 PepperInterface* ppapi = NULL; 79 if (instance && get_browser_interface) { 80 ppapi = new RealPepperInterface(instance, get_browser_interface); 81 s_state.ppapi = ppapi; 82 } 83 int rtn = ki_init_interface(kp, ppapi); 84 return rtn; 85 } 86 87 int ki_init_interface(void* kp, void* pepper_interface) { 88 LOG_TRACE("ki_init_interface: %p %p", kp, pepper_interface); 89 assert(!s_state.kp); 90 if (s_state.kp != NULL) 91 return 1; 92 PepperInterface* ppapi = static_cast<PepperInterface*>(pepper_interface); 93 kernel_wrap_init(); 94 95 if (kp == NULL) { 96 s_state.kp = new KernelProxy(); 97 s_state.kp_owned = true; 98 } else { 99 s_state.kp = static_cast<KernelProxy*>(kp); 100 s_state.kp_owned = false; 101 } 102 103 if (s_state.kp->Init(ppapi) != 0) 104 return 1; 105 106 return 0; 107 } 108 109 int ki_is_initialized() { 110 return s_state.kp != NULL; 111 } 112 113 int ki_uninit() { 114 LOG_TRACE("ki_uninit"); 115 assert(s_state.kp); 116 if (s_state.kp == NULL) 117 return 1; 118 119 if (s_saved_state.kp == NULL) 120 kernel_wrap_uninit(); 121 122 // If we are going to delete the KernelProxy don't do it 123 // until we've swapped it out. 124 KernelInterceptState state_to_delete = s_state; 125 126 ki_pop_state(); 127 128 if (state_to_delete.kp_owned) 129 delete state_to_delete.kp; 130 131 delete state_to_delete.ppapi; 132 return 0; 133 } 134 135 nacl_io::KernelProxy* ki_get_proxy() { 136 return s_state.kp; 137 } 138 139 int ki_chdir(const char* path) { 140 ON_NOSYS_RETURN(-1); 141 return s_state.kp->chdir(path); 142 } 143 144 void ki_exit(int status) { 145 if (ki_is_initialized()) 146 s_state.kp->exit(status); 147 148 _real_exit(status); 149 } 150 151 char* ki_getcwd(char* buf, size_t size) { 152 // gtest uses getcwd in a static initializer and expects it to always 153 // succeed. If we haven't initialized kernel-intercept yet, then try 154 // the IRT's getcwd, and fall back to just returning ".". 155 if (!ki_is_initialized()) { 156 int rtn = _real_getcwd(buf, size); 157 if (rtn != 0) { 158 if (rtn == ENOSYS) { 159 buf[0] = '.'; 160 buf[1] = 0; 161 } else { 162 errno = rtn; 163 return NULL; 164 } 165 } 166 return buf; 167 } 168 return s_state.kp->getcwd(buf, size); 169 } 170 171 char* ki_getwd(char* buf) { 172 ON_NOSYS_RETURN(NULL); 173 return s_state.kp->getwd(buf); 174 } 175 176 int ki_dup(int oldfd) { 177 ON_NOSYS_RETURN(-1); 178 return s_state.kp->dup(oldfd); 179 } 180 181 int ki_dup2(int oldfd, int newfd) { 182 ON_NOSYS_RETURN(-1); 183 return s_state.kp->dup2(oldfd, newfd); 184 } 185 186 int ki_chmod(const char* path, mode_t mode) { 187 ON_NOSYS_RETURN(-1); 188 return s_state.kp->chmod(path, mode); 189 } 190 191 int ki_fchdir(int fd) { 192 ON_NOSYS_RETURN(-1); 193 return s_state.kp->fchdir(fd); 194 } 195 196 int ki_fchmod(int fd, mode_t mode) { 197 ON_NOSYS_RETURN(-1); 198 return s_state.kp->fchmod(fd, mode); 199 } 200 201 int ki_stat(const char* path, struct stat* buf) { 202 ON_NOSYS_RETURN(-1); 203 return s_state.kp->stat(path, buf); 204 } 205 206 int ki_mkdir(const char* path, mode_t mode) { 207 ON_NOSYS_RETURN(-1); 208 return s_state.kp->mkdir(path, mode); 209 } 210 211 int ki_rmdir(const char* path) { 212 ON_NOSYS_RETURN(-1); 213 return s_state.kp->rmdir(path); 214 } 215 216 int ki_mount(const char* source, 217 const char* target, 218 const char* filesystemtype, 219 unsigned long mountflags, 220 const void* data) { 221 ON_NOSYS_RETURN(-1); 222 return s_state.kp->mount(source, target, filesystemtype, mountflags, data); 223 } 224 225 int ki_umount(const char* path) { 226 ON_NOSYS_RETURN(-1); 227 return s_state.kp->umount(path); 228 } 229 230 int ki_open(const char* path, int oflag, mode_t mode) { 231 ON_NOSYS_RETURN(-1); 232 return s_state.kp->open(path, oflag, mode); 233 } 234 235 int ki_pipe(int pipefds[2]) { 236 ON_NOSYS_RETURN(-1); 237 return s_state.kp->pipe(pipefds); 238 } 239 240 ssize_t ki_read(int fd, void* buf, size_t nbyte) { 241 ON_NOSYS_RETURN(-1); 242 return s_state.kp->read(fd, buf, nbyte); 243 } 244 245 ssize_t ki_write(int fd, const void* buf, size_t nbyte) { 246 ON_NOSYS_RETURN(-1); 247 return s_state.kp->write(fd, buf, nbyte); 248 } 249 250 int ki_fstat(int fd, struct stat* buf) { 251 ON_NOSYS_RETURN(-1); 252 return s_state.kp->fstat(fd, buf); 253 } 254 255 int ki_getdents(int fd, void* buf, unsigned int count) { 256 ON_NOSYS_RETURN(-1); 257 return s_state.kp->getdents(fd, buf, count); 258 } 259 260 int ki_ftruncate(int fd, off_t length) { 261 ON_NOSYS_RETURN(-1); 262 return s_state.kp->ftruncate(fd, length); 263 } 264 265 int ki_fsync(int fd) { 266 ON_NOSYS_RETURN(-1); 267 return s_state.kp->fsync(fd); 268 } 269 270 int ki_fdatasync(int fd) { 271 ON_NOSYS_RETURN(-1); 272 return s_state.kp->fdatasync(fd); 273 } 274 275 int ki_isatty(int fd) { 276 ON_NOSYS_RETURN(0); 277 return s_state.kp->isatty(fd); 278 } 279 280 int ki_close(int fd) { 281 ON_NOSYS_RETURN(-1); 282 return s_state.kp->close(fd); 283 } 284 285 off_t ki_lseek(int fd, off_t offset, int whence) { 286 ON_NOSYS_RETURN(-1); 287 return s_state.kp->lseek(fd, offset, whence); 288 } 289 290 int ki_remove(const char* path) { 291 ON_NOSYS_RETURN(-1); 292 return s_state.kp->remove(path); 293 } 294 295 int ki_unlink(const char* path) { 296 ON_NOSYS_RETURN(-1); 297 return s_state.kp->unlink(path); 298 } 299 300 int ki_truncate(const char* path, off_t length) { 301 ON_NOSYS_RETURN(-1); 302 return s_state.kp->truncate(path, length); 303 } 304 305 int ki_lstat(const char* path, struct stat* buf) { 306 ON_NOSYS_RETURN(-1); 307 return s_state.kp->lstat(path, buf); 308 } 309 310 int ki_link(const char* oldpath, const char* newpath) { 311 ON_NOSYS_RETURN(-1); 312 return s_state.kp->link(oldpath, newpath); 313 } 314 315 int ki_rename(const char* path, const char* newpath) { 316 ON_NOSYS_RETURN(-1); 317 return s_state.kp->rename(path, newpath); 318 } 319 320 int ki_symlink(const char* oldpath, const char* newpath) { 321 ON_NOSYS_RETURN(-1); 322 return s_state.kp->symlink(oldpath, newpath); 323 } 324 325 int ki_access(const char* path, int amode) { 326 ON_NOSYS_RETURN(-1); 327 return s_state.kp->access(path, amode); 328 } 329 330 int ki_readlink(const char* path, char* buf, size_t count) { 331 ON_NOSYS_RETURN(-1); 332 return s_state.kp->readlink(path, buf, count); 333 } 334 335 int ki_utimes(const char* path, const struct timeval times[2]) { 336 ON_NOSYS_RETURN(-1); 337 // Implement in terms of utimens. 338 struct timespec ts[2]; 339 ts[0].tv_sec = times[0].tv_sec; 340 ts[0].tv_nsec = times[0].tv_usec * 1000; 341 ts[1].tv_sec = times[1].tv_sec; 342 ts[1].tv_nsec = times[1].tv_usec * 1000; 343 return s_state.kp->utimens(path, ts); 344 } 345 346 int ki_futimes(int fd, const struct timeval times[2]) { 347 ON_NOSYS_RETURN(-1); 348 // Implement in terms of futimens. 349 struct timespec ts[2]; 350 ts[0].tv_sec = times[0].tv_sec; 351 ts[0].tv_nsec = times[0].tv_usec * 1000; 352 ts[1].tv_sec = times[1].tv_sec; 353 ts[1].tv_nsec = times[1].tv_usec * 1000; 354 return s_state.kp->futimens(fd, ts); 355 } 356 357 void* ki_mmap(void* addr, 358 size_t length, 359 int prot, 360 int flags, 361 int fd, 362 off_t offset) { 363 ON_NOSYS_RETURN(MAP_FAILED); 364 return s_state.kp->mmap(addr, length, prot, flags, fd, offset); 365 } 366 367 int ki_munmap(void* addr, size_t length) { 368 ON_NOSYS_RETURN(-1); 369 return s_state.kp->munmap(addr, length); 370 } 371 372 int ki_open_resource(const char* file) { 373 ON_NOSYS_RETURN(-1); 374 return s_state.kp->open_resource(file); 375 } 376 377 int ki_fcntl(int d, int request, va_list args) { 378 ON_NOSYS_RETURN(-1); 379 return s_state.kp->fcntl(d, request, args); 380 } 381 382 int ki_ioctl(int d, int request, va_list args) { 383 ON_NOSYS_RETURN(-1); 384 return s_state.kp->ioctl(d, request, args); 385 } 386 387 int ki_chown(const char* path, uid_t owner, gid_t group) { 388 ON_NOSYS_RETURN(-1); 389 return s_state.kp->chown(path, owner, group); 390 } 391 392 int ki_fchown(int fd, uid_t owner, gid_t group) { 393 ON_NOSYS_RETURN(-1); 394 return s_state.kp->fchown(fd, owner, group); 395 } 396 397 int ki_lchown(const char* path, uid_t owner, gid_t group) { 398 ON_NOSYS_RETURN(-1); 399 return s_state.kp->lchown(path, owner, group); 400 } 401 402 int ki_utime(const char* filename, const struct utimbuf* times) { 403 ON_NOSYS_RETURN(-1); 404 // Implement in terms of utimens. 405 struct timespec ts[2]; 406 ts[0].tv_sec = times->actime; 407 ts[0].tv_nsec = 0; 408 ts[1].tv_sec = times->modtime; 409 ts[1].tv_nsec = 0; 410 return s_state.kp->utimens(filename, ts); 411 } 412 413 int ki_futimens(int fd, const struct timespec times[2]) { 414 ON_NOSYS_RETURN(-1); 415 return s_state.kp->futimens(fd, times); 416 } 417 418 int ki_poll(struct pollfd* fds, nfds_t nfds, int timeout) { 419 return s_state.kp->poll(fds, nfds, timeout); 420 } 421 422 int ki_select(int nfds, 423 fd_set* readfds, 424 fd_set* writefds, 425 fd_set* exceptfds, 426 struct timeval* timeout) { 427 return s_state.kp->select(nfds, readfds, writefds, exceptfds, timeout); 428 } 429 430 int ki_tcflush(int fd, int queue_selector) { 431 ON_NOSYS_RETURN(-1); 432 return s_state.kp->tcflush(fd, queue_selector); 433 } 434 435 int ki_tcgetattr(int fd, struct termios* termios_p) { 436 ON_NOSYS_RETURN(-1); 437 return s_state.kp->tcgetattr(fd, termios_p); 438 } 439 440 int ki_tcsetattr(int fd, 441 int optional_actions, 442 const struct termios* termios_p) { 443 ON_NOSYS_RETURN(-1); 444 return s_state.kp->tcsetattr(fd, optional_actions, termios_p); 445 } 446 447 int ki_kill(pid_t pid, int sig) { 448 ON_NOSYS_RETURN(-1); 449 return s_state.kp->kill(pid, sig); 450 } 451 452 int ki_killpg(pid_t pid, int sig) { 453 errno = ENOSYS; 454 return -1; 455 } 456 457 int ki_sigaction(int signum, 458 const struct sigaction* action, 459 struct sigaction* oaction) { 460 ON_NOSYS_RETURN(-1); 461 return s_state.kp->sigaction(signum, action, oaction); 462 } 463 464 int ki_sigpause(int sigmask) { 465 errno = ENOSYS; 466 return -1; 467 } 468 469 int ki_sigpending(sigset_t* set) { 470 errno = ENOSYS; 471 return -1; 472 } 473 474 int ki_sigsuspend(const sigset_t* set) { 475 errno = ENOSYS; 476 return -1; 477 } 478 479 sighandler_t ki_signal(int signum, sighandler_t handler) { 480 return ki_sigset(signum, handler); 481 } 482 483 sighandler_t ki_sigset(int signum, sighandler_t handler) { 484 ON_NOSYS_RETURN(SIG_ERR); 485 // Implement sigset(2) in terms of sigaction(2). 486 struct sigaction action; 487 struct sigaction oaction; 488 memset(&action, 0, sizeof(action)); 489 memset(&oaction, 0, sizeof(oaction)); 490 action.sa_handler = handler; 491 int rtn = s_state.kp->sigaction(signum, &action, &oaction); 492 if (rtn) 493 return SIG_ERR; 494 return oaction.sa_handler; 495 } 496 497 #ifdef PROVIDES_SOCKET_API 498 // Socket Functions 499 int ki_accept(int fd, struct sockaddr* addr, socklen_t* len) { 500 ON_NOSYS_RETURN(-1); 501 return s_state.kp->accept(fd, addr, len); 502 } 503 504 int ki_bind(int fd, const struct sockaddr* addr, socklen_t len) { 505 ON_NOSYS_RETURN(-1); 506 return s_state.kp->bind(fd, addr, len); 507 } 508 509 int ki_connect(int fd, const struct sockaddr* addr, socklen_t len) { 510 ON_NOSYS_RETURN(-1); 511 return s_state.kp->connect(fd, addr, len); 512 } 513 514 struct hostent* ki_gethostbyname(const char* name) { 515 ON_NOSYS_RETURN(NULL); 516 return s_state.kp->gethostbyname(name); 517 } 518 519 int ki_getnameinfo(const struct sockaddr *sa, 520 socklen_t salen, 521 char *host, 522 size_t hostlen, 523 char *serv, 524 size_t servlen, 525 unsigned int flags) { 526 ON_NOSYS_RETURN(EAI_SYSTEM); 527 return s_state.kp->getnameinfo(sa, salen, host, hostlen, serv, servlen, 528 flags); 529 } 530 531 int ki_getaddrinfo(const char* node, 532 const char* service, 533 const struct addrinfo* hints, 534 struct addrinfo** res) { 535 ON_NOSYS_RETURN(EAI_SYSTEM); 536 return s_state.kp->getaddrinfo(node, service, hints, res); 537 } 538 539 void ki_freeaddrinfo(struct addrinfo* res) { 540 s_state.kp->freeaddrinfo(res); 541 } 542 543 int ki_getpeername(int fd, struct sockaddr* addr, socklen_t* len) { 544 ON_NOSYS_RETURN(-1); 545 return s_state.kp->getpeername(fd, addr, len); 546 } 547 548 int ki_getsockname(int fd, struct sockaddr* addr, socklen_t* len) { 549 ON_NOSYS_RETURN(-1); 550 return s_state.kp->getsockname(fd, addr, len); 551 } 552 553 int ki_getsockopt(int fd, int lvl, int optname, void* optval, socklen_t* len) { 554 ON_NOSYS_RETURN(-1); 555 return s_state.kp->getsockopt(fd, lvl, optname, optval, len); 556 } 557 558 int ki_listen(int fd, int backlog) { 559 ON_NOSYS_RETURN(-1); 560 return s_state.kp->listen(fd, backlog); 561 } 562 563 ssize_t ki_recv(int fd, void* buf, size_t len, int flags) { 564 ON_NOSYS_RETURN(-1); 565 return s_state.kp->recv(fd, buf, len, flags); 566 } 567 568 ssize_t ki_recvfrom(int fd, 569 void* buf, 570 size_t len, 571 int flags, 572 struct sockaddr* addr, 573 socklen_t* addrlen) { 574 ON_NOSYS_RETURN(-1); 575 return s_state.kp->recvfrom(fd, buf, len, flags, addr, addrlen); 576 } 577 578 ssize_t ki_recvmsg(int fd, struct msghdr* msg, int flags) { 579 ON_NOSYS_RETURN(-1); 580 return s_state.kp->recvmsg(fd, msg, flags); 581 } 582 583 ssize_t ki_send(int fd, const void* buf, size_t len, int flags) { 584 ON_NOSYS_RETURN(-1); 585 return s_state.kp->send(fd, buf, len, flags); 586 } 587 588 ssize_t ki_sendto(int fd, 589 const void* buf, 590 size_t len, 591 int flags, 592 const struct sockaddr* addr, 593 socklen_t addrlen) { 594 ON_NOSYS_RETURN(-1); 595 return s_state.kp->sendto(fd, buf, len, flags, addr, addrlen); 596 } 597 598 ssize_t ki_sendmsg(int fd, const struct msghdr* msg, int flags) { 599 ON_NOSYS_RETURN(-1); 600 return s_state.kp->sendmsg(fd, msg, flags); 601 } 602 603 int ki_setsockopt(int fd, 604 int lvl, 605 int optname, 606 const void* optval, 607 socklen_t len) { 608 ON_NOSYS_RETURN(-1); 609 return s_state.kp->setsockopt(fd, lvl, optname, optval, len); 610 } 611 612 int ki_shutdown(int fd, int how) { 613 ON_NOSYS_RETURN(-1); 614 return s_state.kp->shutdown(fd, how); 615 } 616 617 int ki_socket(int domain, int type, int protocol) { 618 ON_NOSYS_RETURN(-1); 619 return s_state.kp->socket(domain, type, protocol); 620 } 621 622 int ki_socketpair(int domain, int type, int protocol, int* sv) { 623 ON_NOSYS_RETURN(-1); 624 return s_state.kp->socketpair(domain, type, protocol, sv); 625 } 626 #endif // PROVIDES_SOCKET_API 627
