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