source3/lib/util_sock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Tim Potter      2000-2001
   6    Copyright (C) Jeremy Allison  1992-2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/filesys.h"
  24 #include "../lib/util/memcache.h"
  25 #include "../lib/async_req/async_sock.h"
  26 #include "../lib/util/select.h"
  27 #include "lib/socket/interfaces.h"
  28 #include "../lib/util/tevent_unix.h"
  29 #include "../lib/util/tevent_ntstatus.h"
  30 #include "../lib/tsocket/tsocket.h"
  31 #include "lib/util/sys_rw.h"
  32 #include "lib/util/sys_rw_data.h"
  33
  34 const char *client_addr(int fd, char *addr, size_t addrlen)
  35 {
  36         return get_peer_addr(fd,addr,addrlen);
  37 }
  38
  39 #if 0
  40 /* Not currently used. JRA. */
  41 int client_socket_port(int fd)
  42 {
  43         return get_socket_port(fd);
  44 }
  45 #endif
  46
  47 /****************************************************************************
  48  Determine if a file descriptor is in fact a socket.
  49 ****************************************************************************/
  50
  51 bool is_a_socket(int fd)
  52 {
  53         int v;
  54         socklen_t l;
  55         l = sizeof(int);
  56         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
  57 }
  58
  59 /****************************************************************************
  60  Read from a socket.
  61 ****************************************************************************/
  62
  63 ssize_t read_udp_v4_socket(int fd,
  64                         char *buf,
  65                         size_t len,
  66                         struct sockaddr_storage *psa)
  67 {
  68         ssize_t ret;
  69         socklen_t socklen = sizeof(*psa);
  70         struct sockaddr_in *si = (struct sockaddr_in *)psa;
  71
  72         memset((char *)psa,'\0',socklen);
  73
  74         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
  75                         (struct sockaddr *)psa,&socklen);
  76         if (ret <= 0) {
  77                 /* Don't print a low debug error for a non-blocking socket. */
  78                 if (errno == EAGAIN) {
  79                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
  80                 } else {
  81                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
  82                                 strerror(errno)));
  83                 }
  84                 return 0;
  85         }
  86
  87         if (psa->ss_family != AF_INET) {
  88                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
  89                         "(not IPv4)\n", (int)psa->ss_family));
  90                 return 0;
  91         }
  92
  93         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
  94                         inet_ntoa(si->sin_addr),
  95                         si->sin_port,
  96                         (unsigned long)ret));
  97
  98         return ret;
  99 }
 100
 101 /****************************************************************************
 102  Read data from a file descriptor with a timout in msec.
 103  mincount = if timeout, minimum to read before returning
 104  maxcount = number to be read.
 105  time_out = timeout in milliseconds
 106  NB. This can be called with a non-socket fd, don't change
 107  sys_read() to sys_recv() or other socket call.
 108 ****************************************************************************/
 109
 110 NTSTATUS read_fd_with_timeout(int fd, char *buf,
 111                                   size_t mincnt, size_t maxcnt,
 112                                   unsigned int time_out,
 113                                   size_t *size_ret)
 114 {
 115         int pollrtn;
 116         ssize_t readret;
 117         size_t nread = 0;
 118
 119         /* just checking .... */
 120         if (maxcnt <= 0)
 121                 return NT_STATUS_OK;
 122
 123         /* Blocking read */
 124         if (time_out == 0) {
 125                 if (mincnt == 0) {
 126                         mincnt = maxcnt;
 127                 }
 128
 129                 while (nread < mincnt) {
 130                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 131
 132                         if (readret == 0) {
 133                                 DEBUG(5,("read_fd_with_timeout: "
 134                                         "blocking read. EOF from client.\n"));
 135                                 return NT_STATUS_END_OF_FILE;
 136                         }
 137
 138                         if (readret == -1) {
 139                                 return map_nt_error_from_unix(errno);
 140                         }
 141                         nread += readret;
 142                 }
 143                 goto done;
 144         }
 145
 146         /* Most difficult - timeout read */
 147         /* If this is ever called on a disk file and
 148            mincnt is greater then the filesize then
 149            system performance will suffer severely as
 150            select always returns true on disk files */
 151
 152         for (nread=0; nread < mincnt; ) {
 153                 int revents;
 154
 155                 pollrtn = poll_intr_one_fd(fd, POLLIN|POLLHUP, time_out,
 156                                            &revents);
 157
 158                 /* Check if error */
 159                 if (pollrtn == -1) {
 160                         return map_nt_error_from_unix(errno);
 161                 }
 162
 163                 /* Did we timeout ? */
 164                 if ((pollrtn == 0) ||
 165                     ((revents & (POLLIN|POLLHUP|POLLERR)) == 0)) {
 166                         DEBUG(10,("read_fd_with_timeout: timeout read. "
 167                                 "select timed out.\n"));
 168                         return NT_STATUS_IO_TIMEOUT;
 169                 }
 170
 171                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 172
 173                 if (readret == 0) {
 174                         /* we got EOF on the file descriptor */
 175                         DEBUG(5,("read_fd_with_timeout: timeout read. "
 176                                 "EOF from client.\n"));
 177                         return NT_STATUS_END_OF_FILE;
 178                 }
 179
 180                 if (readret == -1) {
 181                         return map_nt_error_from_unix(errno);
 182                 }
 183
 184                 nread += readret;
 185         }
 186
 187  done:
 188         /* Return the number we got */
 189         if (size_ret) {
 190                 *size_ret = nread;
 191         }
 192         return NT_STATUS_OK;
 193 }
 194
 195 /****************************************************************************
 196  Read data from an fd, reading exactly N bytes.
 197  NB. This can be called with a non-socket fd, don't add dependencies
 198  on socket calls.
 199 ****************************************************************************/
 200
 201 NTSTATUS read_data_ntstatus(int fd, char *buffer, size_t N)
 202 {
 203         return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
 204 }
 205
 206 /****************************************************************************
 207  Send a keepalive packet (rfc1002).
 208 ****************************************************************************/
 209
 210 bool send_keepalive(int client)
 211 {
 212         unsigned char buf[4];
 213
 214         buf[0] = NBSSkeepalive;
 215         buf[1] = buf[2] = buf[3] = 0;
 216
 217         return(write_data(client,(char *)buf,4) == 4);
 218 }
 219
 220 /****************************************************************************
 221  Read 4 bytes of a smb packet and return the smb length of the packet.
 222  Store the result in the buffer.
 223  This version of the function will return a length of zero on receiving
 224  a keepalive packet.
 225  Timeout is in milliseconds.
 226 ****************************************************************************/
 227
 228 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 229                                           unsigned int timeout,
 230                                           size_t *len)
 231 {
 232         int msg_type;
 233         NTSTATUS status;
 234
 235         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 236
 237         if (!NT_STATUS_IS_OK(status)) {
 238                 return status;
 239         }
 240
 241         *len = smb_len(inbuf);
 242         msg_type = CVAL(inbuf,0);
 243
 244         if (msg_type == NBSSkeepalive) {
 245                 DEBUG(5,("Got keepalive packet\n"));
 246         }
 247
 248         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 249
 250         return NT_STATUS_OK;
 251 }
 252
 253 /****************************************************************************
 254  Read an smb from a fd.
 255  The timeout is in milliseconds.
 256  This function will return on receipt of a session keepalive packet.
 257  maxlen is the max number of bytes to return, not including the 4 byte
 258  length. If zero it means buflen limit.
 259  Doesn't check the MAC on signed packets.
 260 ****************************************************************************/
 261
 262 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 263                          size_t maxlen, size_t *p_len)
 264 {
 265         size_t len;
 266         NTSTATUS status;
 267
 268         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 269
 270         if (!NT_STATUS_IS_OK(status)) {
 271                 DEBUG(0, ("read_fd_with_timeout failed, read "
 272                           "error = %s.\n", nt_errstr(status)));
 273                 return status;
 274         }
 275
 276         if (len > buflen) {
 277                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 278                                         (unsigned long)len));
 279                 return NT_STATUS_INVALID_PARAMETER;
 280         }
 281
 282         if(len > 0) {
 283                 if (maxlen) {
 284                         len = MIN(len,maxlen);
 285                 }
 286
 287                 status = read_fd_with_timeout(
 288                         fd, buffer+4, len, len, timeout, &len);
 289
 290                 if (!NT_STATUS_IS_OK(status)) {
 291                         DEBUG(0, ("read_fd_with_timeout failed, read error = "
 292                                   "%s.\n", nt_errstr(status)));
 293                         return status;
 294                 }
 295
 296                 /* not all of samba3 properly checks for packet-termination
 297                  * of strings. This ensures that we don't run off into
 298                  * empty space. */
 299                 SSVAL(buffer+4,len, 0);
 300         }
 301
 302         *p_len = len;
 303         return NT_STATUS_OK;
 304 }
 305
 306 /****************************************************************************
 307  Open a socket of the specified type, port, and address for incoming data.
 308 ****************************************************************************/
 309
 310 int open_socket_in(int type,
 311                 uint16_t port,
 312                 int dlevel,
 313                 const struct sockaddr_storage *psock,
 314                 bool rebind)
 315 {
 316         struct sockaddr_storage sock;
 317         int res;
 318         socklen_t slen = sizeof(struct sockaddr_in);
 319
 320         sock = *psock;
 321
 322 #if defined(HAVE_IPV6)
 323         if (sock.ss_family == AF_INET6) {
 324                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 325                 slen = sizeof(struct sockaddr_in6);
 326         }
 327 #endif
 328         if (sock.ss_family == AF_INET) {
 329                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 330         }
 331
 332         res = socket(sock.ss_family, type, 0 );
 333         if( res == -1 ) {
 334                 if( DEBUGLVL(0) ) {
 335                         dbgtext( "open_socket_in(): socket() call failed: " );
 336                         dbgtext( "%s\n", strerror( errno ) );
 337                 }
 338                 return -1;
 339         }
 340
 341         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 342         {
 343                 int val = rebind ? 1 : 0;
 344                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 345                                         (char *)&val,sizeof(val)) == -1 ) {
 346                         if( DEBUGLVL( dlevel ) ) {
 347                                 dbgtext( "open_socket_in(): setsockopt: " );
 348                                 dbgtext( "SO_REUSEADDR = %s ",
 349                                                 val?"true":"false" );
 350                                 dbgtext( "on port %d failed ", port );
 351                                 dbgtext( "with error = %s\n", strerror(errno) );
 352                         }
 353                 }
 354 #ifdef SO_REUSEPORT
 355                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 356                                         (char *)&val,sizeof(val)) == -1 ) {
 357                         if( DEBUGLVL( dlevel ) ) {
 358                                 dbgtext( "open_socket_in(): setsockopt: ");
 359                                 dbgtext( "SO_REUSEPORT = %s ",
 360                                                 val?"true":"false");
 361                                 dbgtext( "on port %d failed ", port);
 362                                 dbgtext( "with error = %s\n", strerror(errno));
 363                         }
 364                 }
 365 #endif /* SO_REUSEPORT */
 366         }
 367
 368 #ifdef HAVE_IPV6
 369         /*
 370          * As IPV6_V6ONLY is the default on some systems,
 371          * we better try to be consistent and always use it.
 372          *
 373          * This also avoids using IPv4 via AF_INET6 sockets
 374          * and makes sure %I never resolves to a '::ffff:192.168.0.1'
 375          * string.
 376          */
 377         if (sock.ss_family == AF_INET6) {
 378                 int val = 1;
 379                 int ret;
 380
 381                 ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY,
 382                                  (const void *)&val, sizeof(val));
 383                 if (ret == -1) {
 384                         if(DEBUGLVL(0)) {
 385                                 dbgtext("open_socket_in(): IPV6_ONLY failed: ");
 386                                 dbgtext("%s\n", strerror(errno));
 387                         }
 388                         close(res);
 389                         return -1;
 390                 }
 391         }
 392 #endif
 393
 394         /* now we've got a socket - we need to bind it */
 395         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 396                 if( DEBUGLVL(dlevel) && (port == NMB_PORT ||
 397                                          port == NBT_SMB_PORT ||
 398                                          port == TCP_SMB_PORT) ) {
 399                         char addr[INET6_ADDRSTRLEN];
 400                         print_sockaddr(addr, sizeof(addr),
 401                                         &sock);
 402                         dbgtext( "bind failed on port %d ", port);
 403                         dbgtext( "socket_addr = %s.\n", addr);
 404                         dbgtext( "Error = %s\n", strerror(errno));
 405                 }
 406                 close(res);
 407                 return -1;
 408         }
 409
 410         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 411         return( res );
 412  }
 413
 414 struct open_socket_out_state {
 415         int fd;
 416         struct tevent_context *ev;
 417         struct sockaddr_storage ss;
 418         socklen_t salen;
 419         uint16_t port;
 420         int wait_usec;
 421         struct tevent_req *connect_subreq;
 422 };
 423
 424 static void open_socket_out_connected(struct tevent_req *subreq);
 425
 426 static void open_socket_out_cleanup(struct tevent_req *req,
 427                                     enum tevent_req_state req_state)
 428 {
 429         struct open_socket_out_state *state =
 430                 tevent_req_data(req, struct open_socket_out_state);
 431
 432         /*
 433          * Make sure that the async_connect_send subreq has a chance to reset
 434          * fcntl before the socket goes away.
 435          */
 436         TALLOC_FREE(state->connect_subreq);
 437
 438         if (req_state == TEVENT_REQ_DONE) {
 439                 /*
 440                  * we keep the socket open for the caller to use
 441                  */
 442                 return;
 443         }
 444
 445         if (state->fd != -1) {
 446                 close(state->fd);
 447                 state->fd = -1;
 448         }
 449 }
 450
 451 /****************************************************************************
 452  Create an outgoing socket. timeout is in milliseconds.
 453 **************************************************************************/
 454
 455 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 456                                         struct tevent_context *ev,
 457                                         const struct sockaddr_storage *pss,
 458                                         uint16_t port,
 459                                         int timeout)
 460 {
 461         char addr[INET6_ADDRSTRLEN];
 462         struct tevent_req *result;
 463         struct open_socket_out_state *state;
 464         NTSTATUS status;
 465
 466         result = tevent_req_create(mem_ctx, &state,
 467                                    struct open_socket_out_state);
 468         if (result == NULL) {
 469                 return NULL;
 470         }
 471         state->ev = ev;
 472         state->ss = *pss;
 473         state->port = port;
 474         state->wait_usec = 10000;
 475         state->salen = -1;
 476
 477         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 478         if (state->fd == -1) {
 479                 status = map_nt_error_from_unix(errno);
 480                 goto post_status;
 481         }
 482
 483         tevent_req_set_cleanup_fn(result, open_socket_out_cleanup);
 484
 485         if (!tevent_req_set_endtime(
 486                     result, ev, timeval_current_ofs_msec(timeout))) {
 487                 goto fail;
 488         }
 489
 490 #if defined(HAVE_IPV6)
 491         if (pss->ss_family == AF_INET6) {
 492                 struct sockaddr_in6 *psa6;
 493                 psa6 = (struct sockaddr_in6 *)&state->ss;
 494                 psa6->sin6_port = htons(port);
 495                 if (psa6->sin6_scope_id == 0
 496                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 497                         setup_linklocal_scope_id(
 498                                 (struct sockaddr *)&(state->ss));
 499                 }
 500                 state->salen = sizeof(struct sockaddr_in6);
 501         }
 502 #endif
 503         if (pss->ss_family == AF_INET) {
 504                 struct sockaddr_in *psa;
 505                 psa = (struct sockaddr_in *)&state->ss;
 506                 psa->sin_port = htons(port);
 507                 state->salen = sizeof(struct sockaddr_in);
 508         }
 509
 510         if (pss->ss_family == AF_UNIX) {
 511                 state->salen = sizeof(struct sockaddr_un);
 512         }
 513
 514         print_sockaddr(addr, sizeof(addr), &state->ss);
 515         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 516
 517         state->connect_subreq = async_connect_send(
 518                 state, state->ev, state->fd, (struct sockaddr *)&state->ss,
 519                 state->salen, NULL, NULL, NULL);
 520         if ((state->connect_subreq == NULL)
 521             || !tevent_req_set_endtime(
 522                     state->connect_subreq, state->ev,
 523                     timeval_current_ofs(0, state->wait_usec))) {
 524                 goto fail;
 525         }
 526         tevent_req_set_callback(state->connect_subreq,
 527                                 open_socket_out_connected, result);
 528         return result;
 529
 530  post_status:
 531         tevent_req_nterror(result, status);
 532         return tevent_req_post(result, ev);
 533  fail:
 534         TALLOC_FREE(result);
 535         return NULL;
 536 }
 537
 538 static void open_socket_out_connected(struct tevent_req *subreq)
 539 {
 540         struct tevent_req *req =
 541                 tevent_req_callback_data(subreq, struct tevent_req);
 542         struct open_socket_out_state *state =
 543                 tevent_req_data(req, struct open_socket_out_state);
 544         int ret;
 545         int sys_errno;
 546
 547         ret = async_connect_recv(subreq, &sys_errno);
 548         TALLOC_FREE(subreq);
 549         state->connect_subreq = NULL;
 550         if (ret == 0) {
 551                 tevent_req_done(req);
 552                 return;
 553         }
 554
 555         if (
 556 #ifdef ETIMEDOUT
 557                 (sys_errno == ETIMEDOUT) ||
 558 #endif
 559                 (sys_errno == EINPROGRESS) ||
 560                 (sys_errno == EALREADY) ||
 561                 (sys_errno == EAGAIN)) {
 562
 563                 /*
 564                  * retry
 565                  */
 566
 567                 if (state->wait_usec < 250000) {
 568                         state->wait_usec *= 1.5;
 569                 }
 570
 571                 subreq = async_connect_send(state, state->ev, state->fd,
 572                                             (struct sockaddr *)&state->ss,
 573                                             state->salen, NULL, NULL, NULL);
 574                 if (tevent_req_nomem(subreq, req)) {
 575                         return;
 576                 }
 577                 if (!tevent_req_set_endtime(
 578                             subreq, state->ev,
 579                             timeval_current_ofs_usec(state->wait_usec))) {
 580                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 581                         return;
 582                 }
 583                 state->connect_subreq = subreq;
 584                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
 585                 return;
 586         }
 587
 588 #ifdef EISCONN
 589         if (sys_errno == EISCONN) {
 590                 tevent_req_done(req);
 591                 return;
 592         }
 593 #endif
 594
 595         /* real error */
 596         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
 597 }
 598
 599 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
 600 {
 601         struct open_socket_out_state *state =
 602                 tevent_req_data(req, struct open_socket_out_state);
 603         NTSTATUS status;
 604
 605         if (tevent_req_is_nterror(req, &status)) {
 606                 tevent_req_received(req);
 607                 return status;
 608         }
 609         *pfd = state->fd;
 610         state->fd = -1;
 611         tevent_req_received(req);
 612         return NT_STATUS_OK;
 613 }
 614
 615 /**
 616 * @brief open a socket
 617 *
 618 * @param pss a struct sockaddr_storage defining the address to connect to
 619 * @param port to connect to
 620 * @param timeout in MILLISECONDS
 621 * @param pfd file descriptor returned
 622 *
 623 * @return NTSTATUS code
 624 */
 625 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
 626                          int timeout, int *pfd)
 627 {
 628         TALLOC_CTX *frame = talloc_stackframe();
 629         struct tevent_context *ev;
 630         struct tevent_req *req;
 631         NTSTATUS status = NT_STATUS_NO_MEMORY;
 632
 633         ev = samba_tevent_context_init(frame);
 634         if (ev == NULL) {
 635                 goto fail;
 636         }
 637
 638         req = open_socket_out_send(frame, ev, pss, port, timeout);
 639         if (req == NULL) {
 640                 goto fail;
 641         }
 642         if (!tevent_req_poll(req, ev)) {
 643                 status = NT_STATUS_INTERNAL_ERROR;
 644                 goto fail;
 645         }
 646         status = open_socket_out_recv(req, pfd);
 647  fail:
 648         TALLOC_FREE(frame);
 649         return status;
 650 }
 651
 652 struct open_socket_out_defer_state {
 653         struct tevent_context *ev;
 654         struct sockaddr_storage ss;
 655         uint16_t port;
 656         int timeout;
 657         int fd;
 658 };
 659
 660 static void open_socket_out_defer_waited(struct tevent_req *subreq);
 661 static void open_socket_out_defer_connected(struct tevent_req *subreq);
 662
 663 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
 664                                               struct tevent_context *ev,
 665                                               struct timeval wait_time,
 666                                               const struct sockaddr_storage *pss,
 667                                               uint16_t port,
 668                                               int timeout)
 669 {
 670         struct tevent_req *req, *subreq;
 671         struct open_socket_out_defer_state *state;
 672
 673         req = tevent_req_create(mem_ctx, &state,
 674                                 struct open_socket_out_defer_state);
 675         if (req == NULL) {
 676                 return NULL;
 677         }
 678         state->ev = ev;
 679         state->ss = *pss;
 680         state->port = port;
 681         state->timeout = timeout;
 682
 683         subreq = tevent_wakeup_send(
 684                 state, ev,
 685                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
 686         if (subreq == NULL) {
 687                 goto fail;
 688         }
 689         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
 690         return req;
 691  fail:
 692         TALLOC_FREE(req);
 693         return NULL;
 694 }
 695
 696 static void open_socket_out_defer_waited(struct tevent_req *subreq)
 697 {
 698         struct tevent_req *req = tevent_req_callback_data(
 699                 subreq, struct tevent_req);
 700         struct open_socket_out_defer_state *state = tevent_req_data(
 701                 req, struct open_socket_out_defer_state);
 702         bool ret;
 703
 704         ret = tevent_wakeup_recv(subreq);
 705         TALLOC_FREE(subreq);
 706         if (!ret) {
 707                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 708                 return;
 709         }
 710
 711         subreq = open_socket_out_send(state, state->ev, &state->ss,
 712                                       state->port, state->timeout);
 713         if (tevent_req_nomem(subreq, req)) {
 714                 return;
 715         }
 716         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
 717 }
 718
 719 static void open_socket_out_defer_connected(struct tevent_req *subreq)
 720 {
 721         struct tevent_req *req = tevent_req_callback_data(
 722                 subreq, struct tevent_req);
 723         struct open_socket_out_defer_state *state = tevent_req_data(
 724                 req, struct open_socket_out_defer_state);
 725         NTSTATUS status;
 726
 727         status = open_socket_out_recv(subreq, &state->fd);
 728         TALLOC_FREE(subreq);
 729         if (!NT_STATUS_IS_OK(status)) {
 730                 tevent_req_nterror(req, status);
 731                 return;
 732         }
 733         tevent_req_done(req);
 734 }
 735
 736 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
 737 {
 738         struct open_socket_out_defer_state *state = tevent_req_data(
 739                 req, struct open_socket_out_defer_state);
 740         NTSTATUS status;
 741
 742         if (tevent_req_is_nterror(req, &status)) {
 743                 return status;
 744         }
 745         *pfd = state->fd;
 746         state->fd = -1;
 747         return NT_STATUS_OK;
 748 }
 749
 750 /****************************************************************************
 751  Open a connected UDP socket to host on port
 752 **************************************************************************/
 753
 754 int open_udp_socket(const char *host, int port)
 755 {
 756         struct sockaddr_storage ss;
 757         int res;
 758         socklen_t salen;
 759
 760         if (!interpret_string_addr(&ss, host, 0)) {
 761                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
 762                         host));
 763                 return -1;
 764         }
 765
 766         res = socket(ss.ss_family, SOCK_DGRAM, 0);
 767         if (res == -1) {
 768                 return -1;
 769         }
 770
 771 #if defined(HAVE_IPV6)
 772         if (ss.ss_family == AF_INET6) {
 773                 struct sockaddr_in6 *psa6;
 774                 psa6 = (struct sockaddr_in6 *)&ss;
 775                 psa6->sin6_port = htons(port);
 776                 if (psa6->sin6_scope_id == 0
 777                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 778                         setup_linklocal_scope_id(
 779                                 (struct sockaddr *)&ss);
 780                 }
 781                 salen = sizeof(struct sockaddr_in6);
 782         } else
 783 #endif
 784         if (ss.ss_family == AF_INET) {
 785                 struct sockaddr_in *psa;
 786                 psa = (struct sockaddr_in *)&ss;
 787                 psa->sin_port = htons(port);
 788             salen = sizeof(struct sockaddr_in);
 789         } else {
 790                 DEBUG(1, ("unknown socket family %d", ss.ss_family));
 791                 close(res);
 792                 return -1;
 793         }
 794
 795         if (connect(res, (struct sockaddr *)&ss, salen)) {
 796                 close(res);
 797                 return -1;
 798         }
 799
 800         return res;
 801 }
 802
 803 /*******************************************************************
 804  Return the IP addr of the remote end of a socket as a string.
 805  Optionally return the struct sockaddr_storage.
 806  ******************************************************************/
 807
 808 static const char *get_peer_addr_internal(int fd,
 809                                 char *addr_buf,
 810                                 size_t addr_buf_len,
 811                                 struct sockaddr *pss,
 812                                 socklen_t *plength)
 813 {
 814         struct sockaddr_storage ss;
 815         socklen_t length = sizeof(ss);
 816
 817         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
 818
 819         if (fd == -1) {
 820                 return addr_buf;
 821         }
 822
 823         if (pss == NULL) {
 824                 pss = (struct sockaddr *)&ss;
 825                 plength = &length;
 826         }
 827
 828         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
 829                 int level = (errno == ENOTCONN) ? 2 : 0;
 830                 DEBUG(level, ("getpeername failed. Error was %s\n",
 831                                strerror(errno)));
 832                 return addr_buf;
 833         }
 834
 835         print_sockaddr_len(addr_buf,
 836                         addr_buf_len,
 837                         pss,
 838                         *plength);
 839         return addr_buf;
 840 }
 841
 842 /*******************************************************************
 843  Matchname - determine if host name matches IP address. Used to
 844  confirm a hostname lookup to prevent spoof attacks.
 845 ******************************************************************/
 846
 847 static bool matchname(const char *remotehost,
 848                 const struct sockaddr *pss,
 849                 socklen_t len)
 850 {
 851         struct addrinfo *res = NULL;
 852         struct addrinfo *ailist = NULL;
 853         char addr_buf[INET6_ADDRSTRLEN];
 854         bool ret = interpret_string_addr_internal(&ailist,
 855                         remotehost,
 856                         AI_ADDRCONFIG|AI_CANONNAME);
 857
 858         if (!ret || ailist == NULL) {
 859                 DEBUG(3,("matchname: getaddrinfo failed for "
 860                         "name %s [%s]\n",
 861                         remotehost,
 862                         gai_strerror(ret) ));
 863                 return false;
 864         }
 865
 866         /*
 867          * Make sure that getaddrinfo() returns the "correct" host name.
 868          */
 869
 870         if (ailist->ai_canonname == NULL ||
 871                 (!strequal(remotehost, ailist->ai_canonname) &&
 872                  !strequal(remotehost, "localhost"))) {
 873                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
 874                          remotehost,
 875                          ailist->ai_canonname ?
 876                                  ailist->ai_canonname : "(NULL)"));
 877                 freeaddrinfo(ailist);
 878                 return false;
 879         }
 880
 881         /* Look up the host address in the address list we just got. */
 882         for (res = ailist; res; res = res->ai_next) {
 883                 if (!res->ai_addr) {
 884                         continue;
 885                 }
 886                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
 887                                         (const struct sockaddr *)pss)) {
 888                         freeaddrinfo(ailist);
 889                         return true;
 890                 }
 891         }
 892
 893         /*
 894          * The host name does not map to the original host address. Perhaps
 895          * someone has compromised a name server. More likely someone botched
 896          * it, but that could be dangerous, too.
 897          */
 898
 899         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
 900                 print_sockaddr_len(addr_buf,
 901                         sizeof(addr_buf),
 902                         pss,
 903                         len),
 904                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
 905
 906         if (ailist) {
 907                 freeaddrinfo(ailist);
 908         }
 909         return false;
 910 }
 911
 912 /*******************************************************************
 913  Deal with the singleton cache.
 914 ******************************************************************/
 915
 916 struct name_addr_pair {
 917         struct sockaddr_storage ss;
 918         const char *name;
 919 };
 920
 921 /*******************************************************************
 922  Lookup a name/addr pair. Returns memory allocated from memcache.
 923 ******************************************************************/
 924
 925 static bool lookup_nc(struct name_addr_pair *nc)
 926 {
 927         DATA_BLOB tmp;
 928
 929         ZERO_STRUCTP(nc);
 930
 931         if (!memcache_lookup(
 932                         NULL, SINGLETON_CACHE,
 933                         data_blob_string_const_null("get_peer_name"),
 934                         &tmp)) {
 935                 return false;
 936         }
 937
 938         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
 939         nc->name = (const char *)tmp.data + sizeof(nc->ss);
 940         return true;
 941 }
 942
 943 /*******************************************************************
 944  Save a name/addr pair.
 945 ******************************************************************/
 946
 947 static void store_nc(const struct name_addr_pair *nc)
 948 {
 949         DATA_BLOB tmp;
 950         size_t namelen = strlen(nc->name);
 951
 952         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
 953         if (!tmp.data) {
 954                 return;
 955         }
 956         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
 957         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
 958
 959         memcache_add(NULL, SINGLETON_CACHE,
 960                         data_blob_string_const_null("get_peer_name"),
 961                         tmp);
 962         data_blob_free(&tmp);
 963 }
 964
 965 /*******************************************************************
 966  Return the IP addr of the remote end of a socket as a string.
 967  ******************************************************************/
 968
 969 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
 970 {
 971         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
 972 }
 973
 974 int get_remote_hostname(const struct tsocket_address *remote_address,
 975                         char **name,
 976                         TALLOC_CTX *mem_ctx)
 977 {
 978         char name_buf[MAX_DNS_NAME_LENGTH];
 979         char tmp_name[MAX_DNS_NAME_LENGTH];
 980         struct name_addr_pair nc;
 981         struct sockaddr_storage ss;
 982         ssize_t len;
 983         int rc;
 984
 985         if (!lp_hostname_lookups()) {
 986                 nc.name = tsocket_address_inet_addr_string(remote_address,
 987                                                            mem_ctx);
 988                 if (nc.name == NULL) {
 989                         return -1;
 990                 }
 991
 992                 len = tsocket_address_bsd_sockaddr(remote_address,
 993                                                    (struct sockaddr *) &nc.ss,
 994                                                    sizeof(struct sockaddr_storage));
 995                 if (len < 0) {
 996                         return -1;
 997                 }
 998
 999                 store_nc(&nc);
1000                 lookup_nc(&nc);
1001
1002                 if (nc.name == NULL) {
1003                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1004                 } else {
1005                         *name = talloc_strdup(mem_ctx, nc.name);
1006                 }
1007                 return 0;
1008         }
1009
1010         lookup_nc(&nc);
1011
1012         ZERO_STRUCT(ss);
1013
1014         len = tsocket_address_bsd_sockaddr(remote_address,
1015                                            (struct sockaddr *) &ss,
1016                                            sizeof(struct sockaddr_storage));
1017         if (len < 0) {
1018                 return -1;
1019         }
1020
1021         /* it might be the same as the last one - save some DNS work */
1022         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1023                 if (nc.name == NULL) {
1024                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1025                 } else {
1026                         *name = talloc_strdup(mem_ctx, nc.name);
1027                 }
1028                 return 0;
1029         }
1030
1031         /* Look up the remote host name. */
1032         rc = sys_getnameinfo((struct sockaddr *) &ss,
1033                              len,
1034                              name_buf,
1035                              sizeof(name_buf),
1036                              NULL,
1037                              0,
1038                              0);
1039         if (rc < 0) {
1040                 char *p;
1041
1042                 p = tsocket_address_inet_addr_string(remote_address, mem_ctx);
1043                 if (p == NULL) {
1044                         return -1;
1045                 }
1046
1047                 DEBUG(1,("getnameinfo failed for %s with error %s\n",
1048                          p,
1049                          gai_strerror(rc)));
1050                 strlcpy(name_buf, p, sizeof(name_buf));
1051
1052                 TALLOC_FREE(p);
1053         } else {
1054                 if (!matchname(name_buf, (struct sockaddr *)&ss, len)) {
1055                         DEBUG(0,("matchname failed on %s\n", name_buf));
1056                         strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1057                 }
1058         }
1059
1060         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1061         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1062         if (strstr(name_buf,"..")) {
1063                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1064         }
1065
1066         nc.name = name_buf;
1067         nc.ss = ss;
1068
1069         store_nc(&nc);
1070         lookup_nc(&nc);
1071
1072         if (nc.name == NULL) {
1073                 *name = talloc_strdup(mem_ctx, "UNKOWN");
1074         } else {
1075                 *name = talloc_strdup(mem_ctx, nc.name);
1076         }
1077
1078         return 0;
1079 }
1080
1081 /*******************************************************************
1082  Create protected unix domain socket.
1083
1084  Some unixes cannot set permissions on a ux-dom-sock, so we
1085  have to make sure that the directory contains the protection
1086  permissions instead.
1087  ******************************************************************/
1088
1089 int create_pipe_sock(const char *socket_dir,
1090                      const char *socket_name,
1091                      mode_t dir_perms)
1092 {
1093 #ifdef HAVE_UNIXSOCKET
1094         struct sockaddr_un sunaddr;
1095         bool ok;
1096         int sock = -1;
1097         mode_t old_umask;
1098         char *path = NULL;
1099
1100         old_umask = umask(0);
1101
1102         ok = directory_create_or_exist_strict(socket_dir,
1103                                               sec_initial_uid(),
1104                                               dir_perms);
1105         if (!ok) {
1106                 goto out_close;
1107         }
1108
1109         /* Create the socket file */
1110         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1111
1112         if (sock == -1) {
1113                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1114                         strerror(errno) ));
1115                 goto out_close;
1116         }
1117
1118         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1119                 goto out_close;
1120         }
1121
1122         unlink(path);
1123         memset(&sunaddr, 0, sizeof(sunaddr));
1124         sunaddr.sun_family = AF_UNIX;
1125         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1126
1127         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1128                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1129                         strerror(errno)));
1130                 goto out_close;
1131         }
1132
1133         SAFE_FREE(path);
1134
1135         umask(old_umask);
1136         return sock;
1137
1138 out_close:
1139         SAFE_FREE(path);
1140         if (sock != -1)
1141                 close(sock);
1142
1143         umask(old_umask);
1144         return -1;
1145
1146 #else
1147         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1148         return -1;
1149 #endif /* HAVE_UNIXSOCKET */
1150 }
1151
1152 /****************************************************************************
1153  Get my own canonical name, including domain.
1154 ****************************************************************************/
1155
1156 const char *get_mydnsfullname(void)
1157 {
1158         struct addrinfo *res = NULL;
1159         char my_hostname[HOST_NAME_MAX];
1160         bool ret;
1161         DATA_BLOB tmp;
1162
1163         if (memcache_lookup(NULL, SINGLETON_CACHE,
1164                         data_blob_string_const_null("get_mydnsfullname"),
1165                         &tmp)) {
1166                 SMB_ASSERT(tmp.length > 0);
1167                 return (const char *)tmp.data;
1168         }
1169
1170         /* get my host name */
1171         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1172                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1173                 return NULL;
1174         }
1175
1176         /* Ensure null termination. */
1177         my_hostname[sizeof(my_hostname)-1] = '\0';
1178
1179         ret = interpret_string_addr_internal(&res,
1180                                 my_hostname,
1181                                 AI_ADDRCONFIG|AI_CANONNAME);
1182
1183         if (!ret || res == NULL) {
1184                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1185                         "name %s [%s]\n",
1186                         my_hostname,
1187                         gai_strerror(ret) ));
1188                 return NULL;
1189         }
1190
1191         /*
1192          * Make sure that getaddrinfo() returns the "correct" host name.
1193          */
1194
1195         if (res->ai_canonname == NULL) {
1196                 DEBUG(3,("get_mydnsfullname: failed to get "
1197                         "canonical name for %s\n",
1198                         my_hostname));
1199                 freeaddrinfo(res);
1200                 return NULL;
1201         }
1202
1203         /* This copies the data, so we must do a lookup
1204          * afterwards to find the value to return.
1205          */
1206
1207         memcache_add(NULL, SINGLETON_CACHE,
1208                         data_blob_string_const_null("get_mydnsfullname"),
1209                         data_blob_string_const_null(res->ai_canonname));
1210
1211         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1212                         data_blob_string_const_null("get_mydnsfullname"),
1213                         &tmp)) {
1214                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1215                                 strlen(res->ai_canonname) + 1);
1216         }
1217
1218         freeaddrinfo(res);
1219
1220         return (const char *)tmp.data;
1221 }
1222
1223 /************************************************************
1224  Is this my ip address ?
1225 ************************************************************/
1226
1227 static bool is_my_ipaddr(const char *ipaddr_str)
1228 {
1229         struct sockaddr_storage ss;
1230         struct iface_struct *nics;
1231         int i, n;
1232
1233         if (!interpret_string_addr(&ss, ipaddr_str, AI_NUMERICHOST)) {
1234                 return false;
1235         }
1236
1237         if (is_zero_addr(&ss)) {
1238                 return false;
1239         }
1240
1241         if (ismyaddr((struct sockaddr *)&ss) ||
1242                         is_loopback_addr((struct sockaddr *)&ss)) {
1243                 return true;
1244         }
1245
1246         n = get_interfaces(talloc_tos(), &nics);
1247         for (i=0; i<n; i++) {
1248                 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1249                         TALLOC_FREE(nics);
1250                         return true;
1251                 }
1252         }
1253         TALLOC_FREE(nics);
1254         return false;
1255 }
1256
1257 /************************************************************
1258  Is this my name ?
1259 ************************************************************/
1260
1261 bool is_myname_or_ipaddr(const char *s)
1262 {
1263         TALLOC_CTX *ctx = talloc_tos();
1264         char *name = NULL;
1265         const char *dnsname;
1266         char *servername = NULL;
1267
1268         if (!s) {
1269                 return false;
1270         }
1271
1272         /* Santize the string from '\\name' */
1273         name = talloc_strdup(ctx, s);
1274         if (!name) {
1275                 return false;
1276         }
1277
1278         servername = strrchr_m(name, '\\' );
1279         if (!servername) {
1280                 servername = name;
1281         } else {
1282                 servername++;
1283         }
1284
1285         /* Optimize for the common case */
1286         if (strequal(servername, lp_netbios_name())) {
1287                 return true;
1288         }
1289
1290         /* Check for an alias */
1291         if (is_myname(servername)) {
1292                 return true;
1293         }
1294
1295         /* Check for loopback */
1296         if (strequal(servername, "127.0.0.1") ||
1297                         strequal(servername, "::1")) {
1298                 return true;
1299         }
1300
1301         if (strequal(servername, "localhost")) {
1302                 return true;
1303         }
1304
1305         /* Maybe it's my dns name */
1306         dnsname = get_mydnsfullname();
1307         if (dnsname && strequal(servername, dnsname)) {
1308                 return true;
1309         }
1310
1311         /* Maybe its an IP address? */
1312         if (is_ipaddress(servername)) {
1313                 return is_my_ipaddr(servername);
1314         }
1315
1316         /* Handle possible CNAME records - convert to an IP addr. list. */
1317         {
1318                 /* Use DNS to resolve the name, check all addresses. */
1319                 struct addrinfo *p = NULL;
1320                 struct addrinfo *res = NULL;
1321
1322                 if (!interpret_string_addr_internal(&res,
1323                                 servername,
1324                                 AI_ADDRCONFIG)) {
1325                         return false;
1326                 }
1327
1328                 for (p = res; p; p = p->ai_next) {
1329                         char addr[INET6_ADDRSTRLEN];
1330                         struct sockaddr_storage ss;
1331
1332                         ZERO_STRUCT(ss);
1333                         memcpy(&ss, p->ai_addr, p->ai_addrlen);
1334                         print_sockaddr(addr,
1335                                         sizeof(addr),
1336                                         &ss);
1337                         if (is_my_ipaddr(addr)) {
1338                                 freeaddrinfo(res);
1339                                 return true;
1340                         }
1341                 }
1342                 freeaddrinfo(res);
1343         }
1344
1345         /* No match */
1346         return false;
1347 }
1348
1349 struct getaddrinfo_state {
1350         const char *node;
1351         const char *service;
1352         const struct addrinfo *hints;
1353         struct addrinfo *res;
1354         int ret;
1355 };
1356
1357 static void getaddrinfo_do(void *private_data);
1358 static void getaddrinfo_done(struct tevent_req *subreq);
1359
1360 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1361                                     struct tevent_context *ev,
1362                                     struct fncall_context *ctx,
1363                                     const char *node,
1364                                     const char *service,
1365                                     const struct addrinfo *hints)
1366 {
1367         struct tevent_req *req, *subreq;
1368         struct getaddrinfo_state *state;
1369
1370         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1371         if (req == NULL) {
1372                 return NULL;
1373         }
1374
1375         state->node = node;
1376         state->service = service;
1377         state->hints = hints;
1378
1379         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1380         if (tevent_req_nomem(subreq, req)) {
1381                 return tevent_req_post(req, ev);
1382         }
1383         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1384         return req;
1385 }
1386
1387 static void getaddrinfo_do(void *private_data)
1388 {
1389         struct getaddrinfo_state *state =
1390                 talloc_get_type_abort(private_data, struct getaddrinfo_state);
1391
1392         state->ret = getaddrinfo(state->node, state->service, state->hints,
1393                                  &state->res);
1394 }
1395
1396 static void getaddrinfo_done(struct tevent_req *subreq)
1397 {
1398         struct tevent_req *req = tevent_req_callback_data(
1399                 subreq, struct tevent_req);
1400         int ret, err;
1401
1402         ret = fncall_recv(subreq, &err);
1403         TALLOC_FREE(subreq);
1404         if (ret == -1) {
1405                 tevent_req_error(req, err);
1406                 return;
1407         }
1408         tevent_req_done(req);
1409 }
1410
1411 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1412 {
1413         struct getaddrinfo_state *state = tevent_req_data(
1414                 req, struct getaddrinfo_state);
1415         int err;
1416
1417         if (tevent_req_is_unix_error(req, &err)) {
1418                 switch(err) {
1419                 case ENOMEM:
1420                         return EAI_MEMORY;
1421                 default:
1422                         return EAI_FAIL;
1423                 }
1424         }
1425         if (state->ret == 0) {
1426                 *res = state->res;
1427         }
1428         return state->ret;
1429 }
1430
1431 int poll_one_fd(int fd, int events, int timeout, int *revents)
1432 {
1433         struct pollfd pfd;
1434         int ret;
1435
1436         pfd.fd = fd;
1437         pfd.events = events;
1438
1439         ret = poll(&pfd, 1, timeout);
1440
1441         /*
1442          * Assign whatever poll did, even in the ret<=0 case.
1443          */
1444         *revents = pfd.revents;
1445
1446         return ret;
1447 }
1448
1449 int poll_intr_one_fd(int fd, int events, int timeout, int *revents)
1450 {
1451         struct pollfd pfd;
1452         int ret;
1453
1454         pfd.fd = fd;
1455         pfd.events = events;
1456
1457         ret = sys_poll_intr(&pfd, 1, timeout);
1458         if (ret <= 0) {
1459                 *revents = 0;
1460                 return ret;
1461         }
1462         *revents = pfd.revents;
1463         return 1;
1464 }