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 "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
  32 const char *client_addr(int fd, char *addr, size_t addrlen)
  33 {
  34         return get_peer_addr(fd,addr,addrlen);
  35 }
  36
  37 #if 0
  38 /* Not currently used. JRA. */
  39 int client_socket_port(int fd)
  40 {
  41         return get_socket_port(fd);
  42 }
  43 #endif
  44
  45 /****************************************************************************
  46  Determine if a file descriptor is in fact a socket.
  47 ****************************************************************************/
  48
  49 bool is_a_socket(int fd)
  50 {
  51         int v;
  52         socklen_t l;
  53         l = sizeof(int);
  54         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
  55 }
  56
  57 /****************************************************************************
  58  Read from a socket.
  59 ****************************************************************************/
  60
  61 ssize_t read_udp_v4_socket(int fd,
  62                         char *buf,
  63                         size_t len,
  64                         struct sockaddr_storage *psa)
  65 {
  66         ssize_t ret;
  67         socklen_t socklen = sizeof(*psa);
  68         struct sockaddr_in *si = (struct sockaddr_in *)psa;
  69
  70         memset((char *)psa,'\0',socklen);
  71
  72         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
  73                         (struct sockaddr *)psa,&socklen);
  74         if (ret <= 0) {
  75                 /* Don't print a low debug error for a non-blocking socket. */
  76                 if (errno == EAGAIN) {
  77                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
  78                 } else {
  79                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
  80                                 strerror(errno)));
  81                 }
  82                 return 0;
  83         }
  84
  85         if (psa->ss_family != AF_INET) {
  86                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
  87                         "(not IPv4)\n", (int)psa->ss_family));
  88                 return 0;
  89         }
  90
  91         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
  92                         inet_ntoa(si->sin_addr),
  93                         si->sin_port,
  94                         (unsigned long)ret));
  95
  96         return ret;
  97 }
  98
  99 /****************************************************************************
 100  Read data from a file descriptor with a timout in msec.
 101  mincount = if timeout, minimum to read before returning
 102  maxcount = number to be read.
 103  time_out = timeout in milliseconds
 104  NB. This can be called with a non-socket fd, don't change
 105  sys_read() to sys_recv() or other socket call.
 106 ****************************************************************************/
 107
 108 NTSTATUS read_fd_with_timeout(int fd, char *buf,
 109                                   size_t mincnt, size_t maxcnt,
 110                                   unsigned int time_out,
 111                                   size_t *size_ret)
 112 {
 113         int pollrtn;
 114         ssize_t readret;
 115         size_t nread = 0;
 116
 117         /* just checking .... */
 118         if (maxcnt <= 0)
 119                 return NT_STATUS_OK;
 120
 121         /* Blocking read */
 122         if (time_out == 0) {
 123                 if (mincnt == 0) {
 124                         mincnt = maxcnt;
 125                 }
 126
 127                 while (nread < mincnt) {
 128                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 129
 130                         if (readret == 0) {
 131                                 DEBUG(5,("read_fd_with_timeout: "
 132                                         "blocking read. EOF from client.\n"));
 133                                 return NT_STATUS_END_OF_FILE;
 134                         }
 135
 136                         if (readret == -1) {
 137                                 return map_nt_error_from_unix(errno);
 138                         }
 139                         nread += readret;
 140                 }
 141                 goto done;
 142         }
 143
 144         /* Most difficult - timeout read */
 145         /* If this is ever called on a disk file and
 146            mincnt is greater then the filesize then
 147            system performance will suffer severely as
 148            select always returns true on disk files */
 149
 150         for (nread=0; nread < mincnt; ) {
 151                 int revents;
 152
 153                 pollrtn = poll_intr_one_fd(fd, POLLIN|POLLHUP, time_out,
 154                                            &revents);
 155
 156                 /* Check if error */
 157                 if (pollrtn == -1) {
 158                         return map_nt_error_from_unix(errno);
 159                 }
 160
 161                 /* Did we timeout ? */
 162                 if ((pollrtn == 0) ||
 163                     ((revents & (POLLIN|POLLHUP|POLLERR)) == 0)) {
 164                         DEBUG(10,("read_fd_with_timeout: timeout read. "
 165                                 "select timed out.\n"));
 166                         return NT_STATUS_IO_TIMEOUT;
 167                 }
 168
 169                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 170
 171                 if (readret == 0) {
 172                         /* we got EOF on the file descriptor */
 173                         DEBUG(5,("read_fd_with_timeout: timeout read. "
 174                                 "EOF from client.\n"));
 175                         return NT_STATUS_END_OF_FILE;
 176                 }
 177
 178                 if (readret == -1) {
 179                         return map_nt_error_from_unix(errno);
 180                 }
 181
 182                 nread += readret;
 183         }
 184
 185  done:
 186         /* Return the number we got */
 187         if (size_ret) {
 188                 *size_ret = nread;
 189         }
 190         return NT_STATUS_OK;
 191 }
 192
 193 /****************************************************************************
 194  Read data from an fd, reading exactly N bytes.
 195  NB. This can be called with a non-socket fd, don't add dependencies
 196  on socket calls.
 197 ****************************************************************************/
 198
 199 NTSTATUS read_data(int fd, char *buffer, size_t N)
 200 {
 201         return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
 202 }
 203
 204 /****************************************************************************
 205  Write all data from an iov array
 206  NB. This can be called with a non-socket fd, don't add dependencies
 207  on socket calls.
 208 ****************************************************************************/
 209
 210 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 211 {
 212         int i;
 213         size_t to_send;
 214         ssize_t thistime;
 215         size_t sent;
 216         struct iovec *iov_copy, *iov;
 217
 218         to_send = 0;
 219         for (i=0; i<iovcnt; i++) {
 220                 to_send += orig_iov[i].iov_len;
 221         }
 222
 223         thistime = sys_writev(fd, orig_iov, iovcnt);
 224         if ((thistime <= 0) || (thistime == to_send)) {
 225                 return thistime;
 226         }
 227         sent = thistime;
 228
 229         /*
 230          * We could not send everything in one call. Make a copy of iov that
 231          * we can mess with. We keep a copy of the array start in iov_copy for
 232          * the TALLOC_FREE, because we're going to modify iov later on,
 233          * discarding elements.
 234          */
 235
 236         iov_copy = (struct iovec *)talloc_memdup(
 237                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 238
 239         if (iov_copy == NULL) {
 240                 errno = ENOMEM;
 241                 return -1;
 242         }
 243         iov = iov_copy;
 244
 245         while (sent < to_send) {
 246                 /*
 247                  * We have to discard "thistime" bytes from the beginning
 248                  * iov array, "thistime" contains the number of bytes sent
 249                  * via writev last.
 250                  */
 251                 while (thistime > 0) {
 252                         if (thistime < iov[0].iov_len) {
 253                                 char *new_base =
 254                                         (char *)iov[0].iov_base + thistime;
 255                                 iov[0].iov_base = (void *)new_base;
 256                                 iov[0].iov_len -= thistime;
 257                                 break;
 258                         }
 259                         thistime -= iov[0].iov_len;
 260                         iov += 1;
 261                         iovcnt -= 1;
 262                 }
 263
 264                 thistime = sys_writev(fd, iov, iovcnt);
 265                 if (thistime <= 0) {
 266                         break;
 267                 }
 268                 sent += thistime;
 269         }
 270
 271         TALLOC_FREE(iov_copy);
 272         return sent;
 273 }
 274
 275 /****************************************************************************
 276  Write data to a fd.
 277  NB. This can be called with a non-socket fd, don't add dependencies
 278  on socket calls.
 279 ****************************************************************************/
 280
 281 ssize_t write_data(int fd, const char *buffer, size_t N)
 282 {
 283         struct iovec iov;
 284
 285         iov.iov_base = discard_const_p(void, buffer);
 286         iov.iov_len = N;
 287         return write_data_iov(fd, &iov, 1);
 288 }
 289
 290 /****************************************************************************
 291  Send a keepalive packet (rfc1002).
 292 ****************************************************************************/
 293
 294 bool send_keepalive(int client)
 295 {
 296         unsigned char buf[4];
 297
 298         buf[0] = NBSSkeepalive;
 299         buf[1] = buf[2] = buf[3] = 0;
 300
 301         return(write_data(client,(char *)buf,4) == 4);
 302 }
 303
 304 /****************************************************************************
 305  Read 4 bytes of a smb packet and return the smb length of the packet.
 306  Store the result in the buffer.
 307  This version of the function will return a length of zero on receiving
 308  a keepalive packet.
 309  Timeout is in milliseconds.
 310 ****************************************************************************/
 311
 312 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 313                                           unsigned int timeout,
 314                                           size_t *len)
 315 {
 316         int msg_type;
 317         NTSTATUS status;
 318
 319         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 320
 321         if (!NT_STATUS_IS_OK(status)) {
 322                 return status;
 323         }
 324
 325         *len = smb_len(inbuf);
 326         msg_type = CVAL(inbuf,0);
 327
 328         if (msg_type == NBSSkeepalive) {
 329                 DEBUG(5,("Got keepalive packet\n"));
 330         }
 331
 332         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 333
 334         return NT_STATUS_OK;
 335 }
 336
 337 /****************************************************************************
 338  Read an smb from a fd.
 339  The timeout is in milliseconds.
 340  This function will return on receipt of a session keepalive packet.
 341  maxlen is the max number of bytes to return, not including the 4 byte
 342  length. If zero it means buflen limit.
 343  Doesn't check the MAC on signed packets.
 344 ****************************************************************************/
 345
 346 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 347                          size_t maxlen, size_t *p_len)
 348 {
 349         size_t len;
 350         NTSTATUS status;
 351
 352         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 353
 354         if (!NT_STATUS_IS_OK(status)) {
 355                 DEBUG(0, ("read_fd_with_timeout failed, read "
 356                           "error = %s.\n", nt_errstr(status)));
 357                 return status;
 358         }
 359
 360         if (len > buflen) {
 361                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 362                                         (unsigned long)len));
 363                 return NT_STATUS_INVALID_PARAMETER;
 364         }
 365
 366         if(len > 0) {
 367                 if (maxlen) {
 368                         len = MIN(len,maxlen);
 369                 }
 370
 371                 status = read_fd_with_timeout(
 372                         fd, buffer+4, len, len, timeout, &len);
 373
 374                 if (!NT_STATUS_IS_OK(status)) {
 375                         DEBUG(0, ("read_fd_with_timeout failed, read error = "
 376                                   "%s.\n", nt_errstr(status)));
 377                         return status;
 378                 }
 379
 380                 /* not all of samba3 properly checks for packet-termination
 381                  * of strings. This ensures that we don't run off into
 382                  * empty space. */
 383                 SSVAL(buffer+4,len, 0);
 384         }
 385
 386         *p_len = len;
 387         return NT_STATUS_OK;
 388 }
 389
 390 /****************************************************************************
 391  Open a socket of the specified type, port, and address for incoming data.
 392 ****************************************************************************/
 393
 394 int open_socket_in(int type,
 395                 uint16_t port,
 396                 int dlevel,
 397                 const struct sockaddr_storage *psock,
 398                 bool rebind)
 399 {
 400         struct sockaddr_storage sock;
 401         int res;
 402         socklen_t slen = sizeof(struct sockaddr_in);
 403
 404         sock = *psock;
 405
 406 #if defined(HAVE_IPV6)
 407         if (sock.ss_family == AF_INET6) {
 408                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 409                 slen = sizeof(struct sockaddr_in6);
 410         }
 411 #endif
 412         if (sock.ss_family == AF_INET) {
 413                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 414         }
 415
 416         res = socket(sock.ss_family, type, 0 );
 417         if( res == -1 ) {
 418                 if( DEBUGLVL(0) ) {
 419                         dbgtext( "open_socket_in(): socket() call failed: " );
 420                         dbgtext( "%s\n", strerror( errno ) );
 421                 }
 422                 return -1;
 423         }
 424
 425         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 426         {
 427                 int val = rebind ? 1 : 0;
 428                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 429                                         (char *)&val,sizeof(val)) == -1 ) {
 430                         if( DEBUGLVL( dlevel ) ) {
 431                                 dbgtext( "open_socket_in(): setsockopt: " );
 432                                 dbgtext( "SO_REUSEADDR = %s ",
 433                                                 val?"true":"false" );
 434                                 dbgtext( "on port %d failed ", port );
 435                                 dbgtext( "with error = %s\n", strerror(errno) );
 436                         }
 437                 }
 438 #ifdef SO_REUSEPORT
 439                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 440                                         (char *)&val,sizeof(val)) == -1 ) {
 441                         if( DEBUGLVL( dlevel ) ) {
 442                                 dbgtext( "open_socket_in(): setsockopt: ");
 443                                 dbgtext( "SO_REUSEPORT = %s ",
 444                                                 val?"true":"false");
 445                                 dbgtext( "on port %d failed ", port);
 446                                 dbgtext( "with error = %s\n", strerror(errno));
 447                         }
 448                 }
 449 #endif /* SO_REUSEPORT */
 450         }
 451
 452 #ifdef HAVE_IPV6
 453         /*
 454          * As IPV6_V6ONLY is the default on some systems,
 455          * we better try to be consistent and always use it.
 456          *
 457          * This also avoids using IPv4 via AF_INET6 sockets
 458          * and makes sure %I never resolves to a '::ffff:192.168.0.1'
 459          * string.
 460          */
 461         if (sock.ss_family == AF_INET6) {
 462                 int val = 1;
 463                 int ret;
 464
 465                 ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY,
 466                                  (const void *)&val, sizeof(val));
 467                 if (ret == -1) {
 468                         if(DEBUGLVL(0)) {
 469                                 dbgtext("open_socket_in(): IPV6_ONLY failed: ");
 470                                 dbgtext("%s\n", strerror(errno));
 471                         }
 472                         close(res);
 473                         return -1;
 474                 }
 475         }
 476 #endif
 477
 478         /* now we've got a socket - we need to bind it */
 479         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 480                 if( DEBUGLVL(dlevel) && (port == NMB_PORT ||
 481                                          port == NBT_SMB_PORT ||
 482                                          port == TCP_SMB_PORT) ) {
 483                         char addr[INET6_ADDRSTRLEN];
 484                         print_sockaddr(addr, sizeof(addr),
 485                                         &sock);
 486                         dbgtext( "bind failed on port %d ", port);
 487                         dbgtext( "socket_addr = %s.\n", addr);
 488                         dbgtext( "Error = %s\n", strerror(errno));
 489                 }
 490                 close(res);
 491                 return -1;
 492         }
 493
 494         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 495         return( res );
 496  }
 497
 498 struct open_socket_out_state {
 499         int fd;
 500         struct tevent_context *ev;
 501         struct sockaddr_storage ss;
 502         socklen_t salen;
 503         uint16_t port;
 504         int wait_usec;
 505 };
 506
 507 static void open_socket_out_connected(struct tevent_req *subreq);
 508
 509 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 510 {
 511         if (s->fd != -1) {
 512                 close(s->fd);
 513         }
 514         return 0;
 515 }
 516
 517 /****************************************************************************
 518  Create an outgoing socket. timeout is in milliseconds.
 519 **************************************************************************/
 520
 521 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 522                                         struct tevent_context *ev,
 523                                         const struct sockaddr_storage *pss,
 524                                         uint16_t port,
 525                                         int timeout)
 526 {
 527         char addr[INET6_ADDRSTRLEN];
 528         struct tevent_req *result, *subreq;
 529         struct open_socket_out_state *state;
 530         NTSTATUS status;
 531
 532         result = tevent_req_create(mem_ctx, &state,
 533                                    struct open_socket_out_state);
 534         if (result == NULL) {
 535                 return NULL;
 536         }
 537         state->ev = ev;
 538         state->ss = *pss;
 539         state->port = port;
 540         state->wait_usec = 10000;
 541         state->salen = -1;
 542
 543         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 544         if (state->fd == -1) {
 545                 status = map_nt_error_from_unix(errno);
 546                 goto post_status;
 547         }
 548         talloc_set_destructor(state, open_socket_out_state_destructor);
 549
 550         if (!tevent_req_set_endtime(
 551                     result, ev, timeval_current_ofs_msec(timeout))) {
 552                 goto fail;
 553         }
 554
 555 #if defined(HAVE_IPV6)
 556         if (pss->ss_family == AF_INET6) {
 557                 struct sockaddr_in6 *psa6;
 558                 psa6 = (struct sockaddr_in6 *)&state->ss;
 559                 psa6->sin6_port = htons(port);
 560                 if (psa6->sin6_scope_id == 0
 561                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 562                         setup_linklocal_scope_id(
 563                                 (struct sockaddr *)&(state->ss));
 564                 }
 565                 state->salen = sizeof(struct sockaddr_in6);
 566         }
 567 #endif
 568         if (pss->ss_family == AF_INET) {
 569                 struct sockaddr_in *psa;
 570                 psa = (struct sockaddr_in *)&state->ss;
 571                 psa->sin_port = htons(port);
 572                 state->salen = sizeof(struct sockaddr_in);
 573         }
 574
 575         if (pss->ss_family == AF_UNIX) {
 576                 state->salen = sizeof(struct sockaddr_un);
 577         }
 578
 579         print_sockaddr(addr, sizeof(addr), &state->ss);
 580         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 581
 582         subreq = async_connect_send(state, state->ev, state->fd,
 583                                     (struct sockaddr *)&state->ss,
 584                                     state->salen, NULL, NULL, NULL);
 585         if ((subreq == NULL)
 586             || !tevent_req_set_endtime(
 587                     subreq, state->ev,
 588                     timeval_current_ofs(0, state->wait_usec))) {
 589                 goto fail;
 590         }
 591         tevent_req_set_callback(subreq, open_socket_out_connected, result);
 592         return result;
 593
 594  post_status:
 595         tevent_req_nterror(result, status);
 596         return tevent_req_post(result, ev);
 597  fail:
 598         TALLOC_FREE(result);
 599         return NULL;
 600 }
 601
 602 static void open_socket_out_connected(struct tevent_req *subreq)
 603 {
 604         struct tevent_req *req =
 605                 tevent_req_callback_data(subreq, struct tevent_req);
 606         struct open_socket_out_state *state =
 607                 tevent_req_data(req, struct open_socket_out_state);
 608         int ret;
 609         int sys_errno;
 610
 611         ret = async_connect_recv(subreq, &sys_errno);
 612         TALLOC_FREE(subreq);
 613         if (ret == 0) {
 614                 tevent_req_done(req);
 615                 return;
 616         }
 617
 618         if (
 619 #ifdef ETIMEDOUT
 620                 (sys_errno == ETIMEDOUT) ||
 621 #endif
 622                 (sys_errno == EINPROGRESS) ||
 623                 (sys_errno == EALREADY) ||
 624                 (sys_errno == EAGAIN)) {
 625
 626                 /*
 627                  * retry
 628                  */
 629
 630                 if (state->wait_usec < 250000) {
 631                         state->wait_usec *= 1.5;
 632                 }
 633
 634                 subreq = async_connect_send(state, state->ev, state->fd,
 635                                             (struct sockaddr *)&state->ss,
 636                                             state->salen, NULL, NULL, NULL);
 637                 if (tevent_req_nomem(subreq, req)) {
 638                         return;
 639                 }
 640                 if (!tevent_req_set_endtime(
 641                             subreq, state->ev,
 642                             timeval_current_ofs_usec(state->wait_usec))) {
 643                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 644                         return;
 645                 }
 646                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
 647                 return;
 648         }
 649
 650 #ifdef EISCONN
 651         if (sys_errno == EISCONN) {
 652                 tevent_req_done(req);
 653                 return;
 654         }
 655 #endif
 656
 657         /* real error */
 658         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
 659 }
 660
 661 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
 662 {
 663         struct open_socket_out_state *state =
 664                 tevent_req_data(req, struct open_socket_out_state);
 665         NTSTATUS status;
 666
 667         if (tevent_req_is_nterror(req, &status)) {
 668                 return status;
 669         }
 670         *pfd = state->fd;
 671         state->fd = -1;
 672         return NT_STATUS_OK;
 673 }
 674
 675 /**
 676 * @brief open a socket
 677 *
 678 * @param pss a struct sockaddr_storage defining the address to connect to
 679 * @param port to connect to
 680 * @param timeout in MILLISECONDS
 681 * @param pfd file descriptor returned
 682 *
 683 * @return NTSTATUS code
 684 */
 685 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
 686                          int timeout, int *pfd)
 687 {
 688         TALLOC_CTX *frame = talloc_stackframe();
 689         struct tevent_context *ev;
 690         struct tevent_req *req;
 691         NTSTATUS status = NT_STATUS_NO_MEMORY;
 692
 693         ev = samba_tevent_context_init(frame);
 694         if (ev == NULL) {
 695                 goto fail;
 696         }
 697
 698         req = open_socket_out_send(frame, ev, pss, port, timeout);
 699         if (req == NULL) {
 700                 goto fail;
 701         }
 702         if (!tevent_req_poll(req, ev)) {
 703                 status = NT_STATUS_INTERNAL_ERROR;
 704                 goto fail;
 705         }
 706         status = open_socket_out_recv(req, pfd);
 707  fail:
 708         TALLOC_FREE(frame);
 709         return status;
 710 }
 711
 712 struct open_socket_out_defer_state {
 713         struct tevent_context *ev;
 714         struct sockaddr_storage ss;
 715         uint16_t port;
 716         int timeout;
 717         int fd;
 718 };
 719
 720 static void open_socket_out_defer_waited(struct tevent_req *subreq);
 721 static void open_socket_out_defer_connected(struct tevent_req *subreq);
 722
 723 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
 724                                               struct tevent_context *ev,
 725                                               struct timeval wait_time,
 726                                               const struct sockaddr_storage *pss,
 727                                               uint16_t port,
 728                                               int timeout)
 729 {
 730         struct tevent_req *req, *subreq;
 731         struct open_socket_out_defer_state *state;
 732
 733         req = tevent_req_create(mem_ctx, &state,
 734                                 struct open_socket_out_defer_state);
 735         if (req == NULL) {
 736                 return NULL;
 737         }
 738         state->ev = ev;
 739         state->ss = *pss;
 740         state->port = port;
 741         state->timeout = timeout;
 742
 743         subreq = tevent_wakeup_send(
 744                 state, ev,
 745                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
 746         if (subreq == NULL) {
 747                 goto fail;
 748         }
 749         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
 750         return req;
 751  fail:
 752         TALLOC_FREE(req);
 753         return NULL;
 754 }
 755
 756 static void open_socket_out_defer_waited(struct tevent_req *subreq)
 757 {
 758         struct tevent_req *req = tevent_req_callback_data(
 759                 subreq, struct tevent_req);
 760         struct open_socket_out_defer_state *state = tevent_req_data(
 761                 req, struct open_socket_out_defer_state);
 762         bool ret;
 763
 764         ret = tevent_wakeup_recv(subreq);
 765         TALLOC_FREE(subreq);
 766         if (!ret) {
 767                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 768                 return;
 769         }
 770
 771         subreq = open_socket_out_send(state, state->ev, &state->ss,
 772                                       state->port, state->timeout);
 773         if (tevent_req_nomem(subreq, req)) {
 774                 return;
 775         }
 776         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
 777 }
 778
 779 static void open_socket_out_defer_connected(struct tevent_req *subreq)
 780 {
 781         struct tevent_req *req = tevent_req_callback_data(
 782                 subreq, struct tevent_req);
 783         struct open_socket_out_defer_state *state = tevent_req_data(
 784                 req, struct open_socket_out_defer_state);
 785         NTSTATUS status;
 786
 787         status = open_socket_out_recv(subreq, &state->fd);
 788         TALLOC_FREE(subreq);
 789         if (!NT_STATUS_IS_OK(status)) {
 790                 tevent_req_nterror(req, status);
 791                 return;
 792         }
 793         tevent_req_done(req);
 794 }
 795
 796 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
 797 {
 798         struct open_socket_out_defer_state *state = tevent_req_data(
 799                 req, struct open_socket_out_defer_state);
 800         NTSTATUS status;
 801
 802         if (tevent_req_is_nterror(req, &status)) {
 803                 return status;
 804         }
 805         *pfd = state->fd;
 806         state->fd = -1;
 807         return NT_STATUS_OK;
 808 }
 809
 810 /****************************************************************************
 811  Open a connected UDP socket to host on port
 812 **************************************************************************/
 813
 814 int open_udp_socket(const char *host, int port)
 815 {
 816         struct sockaddr_storage ss;
 817         int res;
 818         socklen_t salen;
 819
 820         if (!interpret_string_addr(&ss, host, 0)) {
 821                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
 822                         host));
 823                 return -1;
 824         }
 825
 826         res = socket(ss.ss_family, SOCK_DGRAM, 0);
 827         if (res == -1) {
 828                 return -1;
 829         }
 830
 831 #if defined(HAVE_IPV6)
 832         if (ss.ss_family == AF_INET6) {
 833                 struct sockaddr_in6 *psa6;
 834                 psa6 = (struct sockaddr_in6 *)&ss;
 835                 psa6->sin6_port = htons(port);
 836                 if (psa6->sin6_scope_id == 0
 837                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 838                         setup_linklocal_scope_id(
 839                                 (struct sockaddr *)&ss);
 840                 }
 841                 salen = sizeof(struct sockaddr_in6);
 842         } else
 843 #endif
 844         if (ss.ss_family == AF_INET) {
 845                 struct sockaddr_in *psa;
 846                 psa = (struct sockaddr_in *)&ss;
 847                 psa->sin_port = htons(port);
 848             salen = sizeof(struct sockaddr_in);
 849         } else {
 850                 DEBUG(1, ("unknown socket family %d", ss.ss_family));
 851                 close(res);
 852                 return -1;
 853         }
 854
 855         if (connect(res, (struct sockaddr *)&ss, salen)) {
 856                 close(res);
 857                 return -1;
 858         }
 859
 860         return res;
 861 }
 862
 863 /*******************************************************************
 864  Return the IP addr of the remote end of a socket as a string.
 865  Optionally return the struct sockaddr_storage.
 866  ******************************************************************/
 867
 868 static const char *get_peer_addr_internal(int fd,
 869                                 char *addr_buf,
 870                                 size_t addr_buf_len,
 871                                 struct sockaddr *pss,
 872                                 socklen_t *plength)
 873 {
 874         struct sockaddr_storage ss;
 875         socklen_t length = sizeof(ss);
 876
 877         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
 878
 879         if (fd == -1) {
 880                 return addr_buf;
 881         }
 882
 883         if (pss == NULL) {
 884                 pss = (struct sockaddr *)&ss;
 885                 plength = &length;
 886         }
 887
 888         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
 889                 int level = (errno == ENOTCONN) ? 2 : 0;
 890                 DEBUG(level, ("getpeername failed. Error was %s\n",
 891                                strerror(errno)));
 892                 return addr_buf;
 893         }
 894
 895         print_sockaddr_len(addr_buf,
 896                         addr_buf_len,
 897                         pss,
 898                         *plength);
 899         return addr_buf;
 900 }
 901
 902 /*******************************************************************
 903  Matchname - determine if host name matches IP address. Used to
 904  confirm a hostname lookup to prevent spoof attacks.
 905 ******************************************************************/
 906
 907 static bool matchname(const char *remotehost,
 908                 const struct sockaddr *pss,
 909                 socklen_t len)
 910 {
 911         struct addrinfo *res = NULL;
 912         struct addrinfo *ailist = NULL;
 913         char addr_buf[INET6_ADDRSTRLEN];
 914         bool ret = interpret_string_addr_internal(&ailist,
 915                         remotehost,
 916                         AI_ADDRCONFIG|AI_CANONNAME);
 917
 918         if (!ret || ailist == NULL) {
 919                 DEBUG(3,("matchname: getaddrinfo failed for "
 920                         "name %s [%s]\n",
 921                         remotehost,
 922                         gai_strerror(ret) ));
 923                 return false;
 924         }
 925
 926         /*
 927          * Make sure that getaddrinfo() returns the "correct" host name.
 928          */
 929
 930         if (ailist->ai_canonname == NULL ||
 931                 (!strequal(remotehost, ailist->ai_canonname) &&
 932                  !strequal(remotehost, "localhost"))) {
 933                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
 934                          remotehost,
 935                          ailist->ai_canonname ?
 936                                  ailist->ai_canonname : "(NULL)"));
 937                 freeaddrinfo(ailist);
 938                 return false;
 939         }
 940
 941         /* Look up the host address in the address list we just got. */
 942         for (res = ailist; res; res = res->ai_next) {
 943                 if (!res->ai_addr) {
 944                         continue;
 945                 }
 946                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
 947                                         (const struct sockaddr *)pss)) {
 948                         freeaddrinfo(ailist);
 949                         return true;
 950                 }
 951         }
 952
 953         /*
 954          * The host name does not map to the original host address. Perhaps
 955          * someone has compromised a name server. More likely someone botched
 956          * it, but that could be dangerous, too.
 957          */
 958
 959         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
 960                 print_sockaddr_len(addr_buf,
 961                         sizeof(addr_buf),
 962                         pss,
 963                         len),
 964                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
 965
 966         if (ailist) {
 967                 freeaddrinfo(ailist);
 968         }
 969         return false;
 970 }
 971
 972 /*******************************************************************
 973  Deal with the singleton cache.
 974 ******************************************************************/
 975
 976 struct name_addr_pair {
 977         struct sockaddr_storage ss;
 978         const char *name;
 979 };
 980
 981 /*******************************************************************
 982  Lookup a name/addr pair. Returns memory allocated from memcache.
 983 ******************************************************************/
 984
 985 static bool lookup_nc(struct name_addr_pair *nc)
 986 {
 987         DATA_BLOB tmp;
 988
 989         ZERO_STRUCTP(nc);
 990
 991         if (!memcache_lookup(
 992                         NULL, SINGLETON_CACHE,
 993                         data_blob_string_const_null("get_peer_name"),
 994                         &tmp)) {
 995                 return false;
 996         }
 997
 998         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
 999         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1000         return true;
1001 }
1002
1003 /*******************************************************************
1004  Save a name/addr pair.
1005 ******************************************************************/
1006
1007 static void store_nc(const struct name_addr_pair *nc)
1008 {
1009         DATA_BLOB tmp;
1010         size_t namelen = strlen(nc->name);
1011
1012         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1013         if (!tmp.data) {
1014                 return;
1015         }
1016         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1017         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1018
1019         memcache_add(NULL, SINGLETON_CACHE,
1020                         data_blob_string_const_null("get_peer_name"),
1021                         tmp);
1022         data_blob_free(&tmp);
1023 }
1024
1025 /*******************************************************************
1026  Return the IP addr of the remote end of a socket as a string.
1027  ******************************************************************/
1028
1029 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1030 {
1031         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1032 }
1033
1034 int get_remote_hostname(const struct tsocket_address *remote_address,
1035                         char **name,
1036                         TALLOC_CTX *mem_ctx)
1037 {
1038         char name_buf[MAX_DNS_NAME_LENGTH];
1039         char tmp_name[MAX_DNS_NAME_LENGTH];
1040         struct name_addr_pair nc;
1041         struct sockaddr_storage ss;
1042         ssize_t len;
1043         int rc;
1044
1045         if (!lp_hostname_lookups()) {
1046                 nc.name = tsocket_address_inet_addr_string(remote_address,
1047                                                            mem_ctx);
1048                 if (nc.name == NULL) {
1049                         return -1;
1050                 }
1051
1052                 len = tsocket_address_bsd_sockaddr(remote_address,
1053                                                    (struct sockaddr *) &nc.ss,
1054                                                    sizeof(struct sockaddr_storage));
1055                 if (len < 0) {
1056                         return -1;
1057                 }
1058
1059                 store_nc(&nc);
1060                 lookup_nc(&nc);
1061
1062                 if (nc.name == NULL) {
1063                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1064                 } else {
1065                         *name = talloc_strdup(mem_ctx, nc.name);
1066                 }
1067                 return 0;
1068         }
1069
1070         lookup_nc(&nc);
1071
1072         ZERO_STRUCT(ss);
1073
1074         len = tsocket_address_bsd_sockaddr(remote_address,
1075                                            (struct sockaddr *) &ss,
1076                                            sizeof(struct sockaddr_storage));
1077         if (len < 0) {
1078                 return -1;
1079         }
1080
1081         /* it might be the same as the last one - save some DNS work */
1082         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1083                 if (nc.name == NULL) {
1084                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1085                 } else {
1086                         *name = talloc_strdup(mem_ctx, nc.name);
1087                 }
1088                 return 0;
1089         }
1090
1091         /* Look up the remote host name. */
1092         rc = sys_getnameinfo((struct sockaddr *) &ss,
1093                              len,
1094                              name_buf,
1095                              sizeof(name_buf),
1096                              NULL,
1097                              0,
1098                              0);
1099         if (rc < 0) {
1100                 char *p;
1101
1102                 p = tsocket_address_inet_addr_string(remote_address, mem_ctx);
1103                 if (p == NULL) {
1104                         return -1;
1105                 }
1106
1107                 DEBUG(1,("getnameinfo failed for %s with error %s\n",
1108                          p,
1109                          gai_strerror(rc)));
1110                 strlcpy(name_buf, p, sizeof(name_buf));
1111
1112                 TALLOC_FREE(p);
1113         } else {
1114                 if (!matchname(name_buf, (struct sockaddr *)&ss, len)) {
1115                         DEBUG(0,("matchname failed on %s\n", name_buf));
1116                         strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1117                 }
1118         }
1119
1120         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1121         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1122         if (strstr(name_buf,"..")) {
1123                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1124         }
1125
1126         nc.name = name_buf;
1127         nc.ss = ss;
1128
1129         store_nc(&nc);
1130         lookup_nc(&nc);
1131
1132         if (nc.name == NULL) {
1133                 *name = talloc_strdup(mem_ctx, "UNKOWN");
1134         } else {
1135                 *name = talloc_strdup(mem_ctx, nc.name);
1136         }
1137
1138         return 0;
1139 }
1140
1141 /*******************************************************************
1142  Create protected unix domain socket.
1143
1144  Some unixes cannot set permissions on a ux-dom-sock, so we
1145  have to make sure that the directory contains the protection
1146  permissions instead.
1147  ******************************************************************/
1148
1149 int create_pipe_sock(const char *socket_dir,
1150                      const char *socket_name,
1151                      mode_t dir_perms)
1152 {
1153 #ifdef HAVE_UNIXSOCKET
1154         struct sockaddr_un sunaddr;
1155         bool ok;
1156         int sock = -1;
1157         mode_t old_umask;
1158         char *path = NULL;
1159
1160         old_umask = umask(0);
1161
1162         ok = directory_create_or_exist_strict(socket_dir,
1163                                               sec_initial_uid(),
1164                                               dir_perms);
1165         if (!ok) {
1166                 goto out_close;
1167         }
1168
1169         /* Create the socket file */
1170         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1171
1172         if (sock == -1) {
1173                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1174                         strerror(errno) ));
1175                 goto out_close;
1176         }
1177
1178         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1179                 goto out_close;
1180         }
1181
1182         unlink(path);
1183         memset(&sunaddr, 0, sizeof(sunaddr));
1184         sunaddr.sun_family = AF_UNIX;
1185         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1186
1187         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1188                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1189                         strerror(errno)));
1190                 goto out_close;
1191         }
1192
1193         SAFE_FREE(path);
1194
1195         umask(old_umask);
1196         return sock;
1197
1198 out_close:
1199         SAFE_FREE(path);
1200         if (sock != -1)
1201                 close(sock);
1202
1203         umask(old_umask);
1204         return -1;
1205
1206 #else
1207         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1208         return -1;
1209 #endif /* HAVE_UNIXSOCKET */
1210 }
1211
1212 /****************************************************************************
1213  Get my own canonical name, including domain.
1214 ****************************************************************************/
1215
1216 const char *get_mydnsfullname(void)
1217 {
1218         struct addrinfo *res = NULL;
1219         char my_hostname[HOST_NAME_MAX];
1220         bool ret;
1221         DATA_BLOB tmp;
1222
1223         if (memcache_lookup(NULL, SINGLETON_CACHE,
1224                         data_blob_string_const_null("get_mydnsfullname"),
1225                         &tmp)) {
1226                 SMB_ASSERT(tmp.length > 0);
1227                 return (const char *)tmp.data;
1228         }
1229
1230         /* get my host name */
1231         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1232                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1233                 return NULL;
1234         }
1235
1236         /* Ensure null termination. */
1237         my_hostname[sizeof(my_hostname)-1] = '\0';
1238
1239         ret = interpret_string_addr_internal(&res,
1240                                 my_hostname,
1241                                 AI_ADDRCONFIG|AI_CANONNAME);
1242
1243         if (!ret || res == NULL) {
1244                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1245                         "name %s [%s]\n",
1246                         my_hostname,
1247                         gai_strerror(ret) ));
1248                 return NULL;
1249         }
1250
1251         /*
1252          * Make sure that getaddrinfo() returns the "correct" host name.
1253          */
1254
1255         if (res->ai_canonname == NULL) {
1256                 DEBUG(3,("get_mydnsfullname: failed to get "
1257                         "canonical name for %s\n",
1258                         my_hostname));
1259                 freeaddrinfo(res);
1260                 return NULL;
1261         }
1262
1263         /* This copies the data, so we must do a lookup
1264          * afterwards to find the value to return.
1265          */
1266
1267         memcache_add(NULL, SINGLETON_CACHE,
1268                         data_blob_string_const_null("get_mydnsfullname"),
1269                         data_blob_string_const_null(res->ai_canonname));
1270
1271         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1272                         data_blob_string_const_null("get_mydnsfullname"),
1273                         &tmp)) {
1274                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1275                                 strlen(res->ai_canonname) + 1);
1276         }
1277
1278         freeaddrinfo(res);
1279
1280         return (const char *)tmp.data;
1281 }
1282
1283 /************************************************************
1284  Is this my ip address ?
1285 ************************************************************/
1286
1287 static bool is_my_ipaddr(const char *ipaddr_str)
1288 {
1289         struct sockaddr_storage ss;
1290         struct iface_struct *nics;
1291         int i, n;
1292
1293         if (!interpret_string_addr(&ss, ipaddr_str, AI_NUMERICHOST)) {
1294                 return false;
1295         }
1296
1297         if (is_zero_addr(&ss)) {
1298                 return false;
1299         }
1300
1301         if (ismyaddr((struct sockaddr *)&ss) ||
1302                         is_loopback_addr((struct sockaddr *)&ss)) {
1303                 return true;
1304         }
1305
1306         n = get_interfaces(talloc_tos(), &nics);
1307         for (i=0; i<n; i++) {
1308                 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1309                         TALLOC_FREE(nics);
1310                         return true;
1311                 }
1312         }
1313         TALLOC_FREE(nics);
1314         return false;
1315 }
1316
1317 /************************************************************
1318  Is this my name ?
1319 ************************************************************/
1320
1321 bool is_myname_or_ipaddr(const char *s)
1322 {
1323         TALLOC_CTX *ctx = talloc_tos();
1324         char *name = NULL;
1325         const char *dnsname;
1326         char *servername = NULL;
1327
1328         if (!s) {
1329                 return false;
1330         }
1331
1332         /* Santize the string from '\\name' */
1333         name = talloc_strdup(ctx, s);
1334         if (!name) {
1335                 return false;
1336         }
1337
1338         servername = strrchr_m(name, '\\' );
1339         if (!servername) {
1340                 servername = name;
1341         } else {
1342                 servername++;
1343         }
1344
1345         /* Optimize for the common case */
1346         if (strequal(servername, lp_netbios_name())) {
1347                 return true;
1348         }
1349
1350         /* Check for an alias */
1351         if (is_myname(servername)) {
1352                 return true;
1353         }
1354
1355         /* Check for loopback */
1356         if (strequal(servername, "127.0.0.1") ||
1357                         strequal(servername, "::1")) {
1358                 return true;
1359         }
1360
1361         if (strequal(servername, "localhost")) {
1362                 return true;
1363         }
1364
1365         /* Maybe it's my dns name */
1366         dnsname = get_mydnsfullname();
1367         if (dnsname && strequal(servername, dnsname)) {
1368                 return true;
1369         }
1370
1371         /* Maybe its an IP address? */
1372         if (is_ipaddress(servername)) {
1373                 return is_my_ipaddr(servername);
1374         }
1375
1376         /* Handle possible CNAME records - convert to an IP addr. list. */
1377         {
1378                 /* Use DNS to resolve the name, check all addresses. */
1379                 struct addrinfo *p = NULL;
1380                 struct addrinfo *res = NULL;
1381
1382                 if (!interpret_string_addr_internal(&res,
1383                                 servername,
1384                                 AI_ADDRCONFIG)) {
1385                         return false;
1386                 }
1387
1388                 for (p = res; p; p = p->ai_next) {
1389                         char addr[INET6_ADDRSTRLEN];
1390                         struct sockaddr_storage ss;
1391
1392                         ZERO_STRUCT(ss);
1393                         memcpy(&ss, p->ai_addr, p->ai_addrlen);
1394                         print_sockaddr(addr,
1395                                         sizeof(addr),
1396                                         &ss);
1397                         if (is_my_ipaddr(addr)) {
1398                                 freeaddrinfo(res);
1399                                 return true;
1400                         }
1401                 }
1402                 freeaddrinfo(res);
1403         }
1404
1405         /* No match */
1406         return false;
1407 }
1408
1409 struct getaddrinfo_state {
1410         const char *node;
1411         const char *service;
1412         const struct addrinfo *hints;
1413         struct addrinfo *res;
1414         int ret;
1415 };
1416
1417 static void getaddrinfo_do(void *private_data);
1418 static void getaddrinfo_done(struct tevent_req *subreq);
1419
1420 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1421                                     struct tevent_context *ev,
1422                                     struct fncall_context *ctx,
1423                                     const char *node,
1424                                     const char *service,
1425                                     const struct addrinfo *hints)
1426 {
1427         struct tevent_req *req, *subreq;
1428         struct getaddrinfo_state *state;
1429
1430         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1431         if (req == NULL) {
1432                 return NULL;
1433         }
1434
1435         state->node = node;
1436         state->service = service;
1437         state->hints = hints;
1438
1439         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1440         if (tevent_req_nomem(subreq, req)) {
1441                 return tevent_req_post(req, ev);
1442         }
1443         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1444         return req;
1445 }
1446
1447 static void getaddrinfo_do(void *private_data)
1448 {
1449         struct getaddrinfo_state *state =
1450                 (struct getaddrinfo_state *)private_data;
1451
1452         state->ret = getaddrinfo(state->node, state->service, state->hints,
1453                                  &state->res);
1454 }
1455
1456 static void getaddrinfo_done(struct tevent_req *subreq)
1457 {
1458         struct tevent_req *req = tevent_req_callback_data(
1459                 subreq, struct tevent_req);
1460         int ret, err;
1461
1462         ret = fncall_recv(subreq, &err);
1463         TALLOC_FREE(subreq);
1464         if (ret == -1) {
1465                 tevent_req_error(req, err);
1466                 return;
1467         }
1468         tevent_req_done(req);
1469 }
1470
1471 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1472 {
1473         struct getaddrinfo_state *state = tevent_req_data(
1474                 req, struct getaddrinfo_state);
1475         int err;
1476
1477         if (tevent_req_is_unix_error(req, &err)) {
1478                 switch(err) {
1479                 case ENOMEM:
1480                         return EAI_MEMORY;
1481                 default:
1482                         return EAI_FAIL;
1483                 }
1484         }
1485         if (state->ret == 0) {
1486                 *res = state->res;
1487         }
1488         return state->ret;
1489 }
1490
1491 int poll_one_fd(int fd, int events, int timeout, int *revents)
1492 {
1493         struct pollfd *fds;
1494         int ret;
1495         int saved_errno;
1496
1497         fds = talloc_zero_array(talloc_tos(), struct pollfd, 1);
1498         if (fds == NULL) {
1499                 errno = ENOMEM;
1500                 return -1;
1501         }
1502         fds[0].fd = fd;
1503         fds[0].events = events;
1504
1505         ret = poll(fds, 1, timeout);
1506
1507         /*
1508          * Assign whatever poll did, even in the ret<=0 case.
1509          */
1510         *revents = fds[0].revents;
1511         saved_errno = errno;
1512         TALLOC_FREE(fds);
1513         errno = saved_errno;
1514
1515         return ret;
1516 }
1517
1518 int poll_intr_one_fd(int fd, int events, int timeout, int *revents)
1519 {
1520         struct pollfd pfd;
1521         int ret;
1522
1523         pfd.fd = fd;
1524         pfd.events = events;
1525
1526         ret = sys_poll_intr(&pfd, 1, timeout);
1527         if (ret <= 0) {
1528                 *revents = 0;
1529                 return ret;
1530         }
1531         *revents = pfd.revents;
1532         return 1;
1533 }