native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc

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