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 ssize_t iov_buflen(const struct iovec *iov, int iovcnt)
 205 {
 206         size_t buflen = 0;
 207         int i;
 208
 209         for (i=0; i<iovcnt; i++) {
 210                 size_t thislen = iov[i].iov_len;
 211                 size_t tmp = buflen + thislen;
 212
 213                 if ((tmp < buflen) || (tmp < thislen)) {
 214                         /* overflow */
 215                         return -1;
 216                 }
 217                 buflen = tmp;
 218         }
 219         return buflen;
 220 }
 221
 222 /****************************************************************************
 223  Write all data from an iov array
 224  NB. This can be called with a non-socket fd, don't add dependencies
 225  on socket calls.
 226 ****************************************************************************/
 227
 228 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 229 {
 230         ssize_t to_send;
 231         ssize_t thistime;
 232         size_t sent;
 233         struct iovec *iov_copy, *iov;
 234
 235         to_send = iov_buflen(orig_iov, iovcnt);
 236         if (to_send == -1) {
 237                 errno = EINVAL;
 238                 return -1;
 239         }
 240
 241         thistime = sys_writev(fd, orig_iov, iovcnt);
 242         if ((thistime <= 0) || (thistime == to_send)) {
 243                 return thistime;
 244         }
 245         sent = thistime;
 246
 247         /*
 248          * We could not send everything in one call. Make a copy of iov that
 249          * we can mess with. We keep a copy of the array start in iov_copy for
 250          * the TALLOC_FREE, because we're going to modify iov later on,
 251          * discarding elements.
 252          */
 253
 254         iov_copy = (struct iovec *)talloc_memdup(
 255                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 256
 257         if (iov_copy == NULL) {
 258                 errno = ENOMEM;
 259                 return -1;
 260         }
 261         iov = iov_copy;
 262
 263         while (sent < to_send) {
 264                 /*
 265                  * We have to discard "thistime" bytes from the beginning
 266                  * iov array, "thistime" contains the number of bytes sent
 267                  * via writev last.
 268                  */
 269                 while (thistime > 0) {
 270                         if (thistime < iov[0].iov_len) {
 271                                 char *new_base =
 272                                         (char *)iov[0].iov_base + thistime;
 273                                 iov[0].iov_base = (void *)new_base;
 274                                 iov[0].iov_len -= thistime;
 275                                 break;
 276                         }
 277                         thistime -= iov[0].iov_len;
 278                         iov += 1;
 279                         iovcnt -= 1;
 280                 }
 281
 282                 thistime = sys_writev(fd, iov, iovcnt);
 283                 if (thistime <= 0) {
 284                         break;
 285                 }
 286                 sent += thistime;
 287         }
 288
 289         TALLOC_FREE(iov_copy);
 290         return sent;
 291 }
 292
 293 /****************************************************************************
 294  Write data to a fd.
 295  NB. This can be called with a non-socket fd, don't add dependencies
 296  on socket calls.
 297 ****************************************************************************/
 298
 299 ssize_t write_data(int fd, const char *buffer, size_t N)
 300 {
 301         struct iovec iov;
 302
 303         iov.iov_base = discard_const_p(void, buffer);
 304         iov.iov_len = N;
 305         return write_data_iov(fd, &iov, 1);
 306 }
 307
 308 /****************************************************************************
 309  Send a keepalive packet (rfc1002).
 310 ****************************************************************************/
 311
 312 bool send_keepalive(int client)
 313 {
 314         unsigned char buf[4];
 315
 316         buf[0] = NBSSkeepalive;
 317         buf[1] = buf[2] = buf[3] = 0;
 318
 319         return(write_data(client,(char *)buf,4) == 4);
 320 }
 321
 322 /****************************************************************************
 323  Read 4 bytes of a smb packet and return the smb length of the packet.
 324  Store the result in the buffer.
 325  This version of the function will return a length of zero on receiving
 326  a keepalive packet.
 327  Timeout is in milliseconds.
 328 ****************************************************************************/
 329
 330 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 331                                           unsigned int timeout,
 332                                           size_t *len)
 333 {
 334         int msg_type;
 335         NTSTATUS status;
 336
 337         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 338
 339         if (!NT_STATUS_IS_OK(status)) {
 340                 return status;
 341         }
 342
 343         *len = smb_len(inbuf);
 344         msg_type = CVAL(inbuf,0);
 345
 346         if (msg_type == NBSSkeepalive) {
 347                 DEBUG(5,("Got keepalive packet\n"));
 348         }
 349
 350         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 351
 352         return NT_STATUS_OK;
 353 }
 354
 355 /****************************************************************************
 356  Read an smb from a fd.
 357  The timeout is in milliseconds.
 358  This function will return on receipt of a session keepalive packet.
 359  maxlen is the max number of bytes to return, not including the 4 byte
 360  length. If zero it means buflen limit.
 361  Doesn't check the MAC on signed packets.
 362 ****************************************************************************/
 363
 364 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 365                          size_t maxlen, size_t *p_len)
 366 {
 367         size_t len;
 368         NTSTATUS status;
 369
 370         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 371
 372         if (!NT_STATUS_IS_OK(status)) {
 373                 DEBUG(0, ("read_fd_with_timeout failed, read "
 374                           "error = %s.\n", nt_errstr(status)));
 375                 return status;
 376         }
 377
 378         if (len > buflen) {
 379                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 380                                         (unsigned long)len));
 381                 return NT_STATUS_INVALID_PARAMETER;
 382         }
 383
 384         if(len > 0) {
 385                 if (maxlen) {
 386                         len = MIN(len,maxlen);
 387                 }
 388
 389                 status = read_fd_with_timeout(
 390                         fd, buffer+4, len, len, timeout, &len);
 391
 392                 if (!NT_STATUS_IS_OK(status)) {
 393                         DEBUG(0, ("read_fd_with_timeout failed, read error = "
 394                                   "%s.\n", nt_errstr(status)));
 395                         return status;
 396                 }
 397
 398                 /* not all of samba3 properly checks for packet-termination
 399                  * of strings. This ensures that we don't run off into
 400                  * empty space. */
 401                 SSVAL(buffer+4,len, 0);
 402         }
 403
 404         *p_len = len;
 405         return NT_STATUS_OK;
 406 }
 407
 408 /****************************************************************************
 409  Open a socket of the specified type, port, and address for incoming data.
 410 ****************************************************************************/
 411
 412 int open_socket_in(int type,
 413                 uint16_t port,
 414                 int dlevel,
 415                 const struct sockaddr_storage *psock,
 416                 bool rebind)
 417 {
 418         struct sockaddr_storage sock;
 419         int res;
 420         socklen_t slen = sizeof(struct sockaddr_in);
 421
 422         sock = *psock;
 423
 424 #if defined(HAVE_IPV6)
 425         if (sock.ss_family == AF_INET6) {
 426                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 427                 slen = sizeof(struct sockaddr_in6);
 428         }
 429 #endif
 430         if (sock.ss_family == AF_INET) {
 431                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 432         }
 433
 434         res = socket(sock.ss_family, type, 0 );
 435         if( res == -1 ) {
 436                 if( DEBUGLVL(0) ) {
 437                         dbgtext( "open_socket_in(): socket() call failed: " );
 438                         dbgtext( "%s\n", strerror( errno ) );
 439                 }
 440                 return -1;
 441         }
 442
 443         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 444         {
 445                 int val = rebind ? 1 : 0;
 446                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 447                                         (char *)&val,sizeof(val)) == -1 ) {
 448                         if( DEBUGLVL( dlevel ) ) {
 449                                 dbgtext( "open_socket_in(): setsockopt: " );
 450                                 dbgtext( "SO_REUSEADDR = %s ",
 451                                                 val?"true":"false" );
 452                                 dbgtext( "on port %d failed ", port );
 453                                 dbgtext( "with error = %s\n", strerror(errno) );
 454                         }
 455                 }
 456 #ifdef SO_REUSEPORT
 457                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 458                                         (char *)&val,sizeof(val)) == -1 ) {
 459                         if( DEBUGLVL( dlevel ) ) {
 460                                 dbgtext( "open_socket_in(): setsockopt: ");
 461                                 dbgtext( "SO_REUSEPORT = %s ",
 462                                                 val?"true":"false");
 463                                 dbgtext( "on port %d failed ", port);
 464                                 dbgtext( "with error = %s\n", strerror(errno));
 465                         }
 466                 }
 467 #endif /* SO_REUSEPORT */
 468         }
 469
 470 #ifdef HAVE_IPV6
 471         /*
 472          * As IPV6_V6ONLY is the default on some systems,
 473          * we better try to be consistent and always use it.
 474          *
 475          * This also avoids using IPv4 via AF_INET6 sockets
 476          * and makes sure %I never resolves to a '::ffff:192.168.0.1'
 477          * string.
 478          */
 479         if (sock.ss_family == AF_INET6) {
 480                 int val = 1;
 481                 int ret;
 482
 483                 ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY,
 484                                  (const void *)&val, sizeof(val));
 485                 if (ret == -1) {
 486                         if(DEBUGLVL(0)) {
 487                                 dbgtext("open_socket_in(): IPV6_ONLY failed: ");
 488                                 dbgtext("%s\n", strerror(errno));
 489                         }
 490                         close(res);
 491                         return -1;
 492                 }
 493         }
 494 #endif
 495
 496         /* now we've got a socket - we need to bind it */
 497         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 498                 if( DEBUGLVL(dlevel) && (port == NMB_PORT ||
 499                                          port == NBT_SMB_PORT ||
 500                                          port == TCP_SMB_PORT) ) {
 501                         char addr[INET6_ADDRSTRLEN];
 502                         print_sockaddr(addr, sizeof(addr),
 503                                         &sock);
 504                         dbgtext( "bind failed on port %d ", port);
 505                         dbgtext( "socket_addr = %s.\n", addr);
 506                         dbgtext( "Error = %s\n", strerror(errno));
 507                 }
 508                 close(res);
 509                 return -1;
 510         }
 511
 512         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 513         return( res );
 514  }
 515
 516 struct open_socket_out_state {
 517         int fd;
 518         struct tevent_context *ev;
 519         struct sockaddr_storage ss;
 520         socklen_t salen;
 521         uint16_t port;
 522         int wait_usec;
 523 };
 524
 525 static void open_socket_out_connected(struct tevent_req *subreq);
 526
 527 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 528 {
 529         if (s->fd != -1) {
 530                 close(s->fd);
 531         }
 532         return 0;
 533 }
 534
 535 /****************************************************************************
 536  Create an outgoing socket. timeout is in milliseconds.
 537 **************************************************************************/
 538
 539 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 540                                         struct tevent_context *ev,
 541                                         const struct sockaddr_storage *pss,
 542                                         uint16_t port,
 543                                         int timeout)
 544 {
 545         char addr[INET6_ADDRSTRLEN];
 546         struct tevent_req *result, *subreq;
 547         struct open_socket_out_state *state;
 548         NTSTATUS status;
 549
 550         result = tevent_req_create(mem_ctx, &state,
 551                                    struct open_socket_out_state);
 552         if (result == NULL) {
 553                 return NULL;
 554         }
 555         state->ev = ev;
 556         state->ss = *pss;
 557         state->port = port;
 558         state->wait_usec = 10000;
 559         state->salen = -1;
 560
 561         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 562         if (state->fd == -1) {
 563                 status = map_nt_error_from_unix(errno);
 564                 goto post_status;
 565         }
 566         talloc_set_destructor(state, open_socket_out_state_destructor);
 567
 568         if (!tevent_req_set_endtime(
 569                     result, ev, timeval_current_ofs_msec(timeout))) {
 570                 goto fail;
 571         }
 572
 573 #if defined(HAVE_IPV6)
 574         if (pss->ss_family == AF_INET6) {
 575                 struct sockaddr_in6 *psa6;
 576                 psa6 = (struct sockaddr_in6 *)&state->ss;
 577                 psa6->sin6_port = htons(port);
 578                 if (psa6->sin6_scope_id == 0
 579                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 580                         setup_linklocal_scope_id(
 581                                 (struct sockaddr *)&(state->ss));
 582                 }
 583                 state->salen = sizeof(struct sockaddr_in6);
 584         }
 585 #endif
 586         if (pss->ss_family == AF_INET) {
 587                 struct sockaddr_in *psa;
 588                 psa = (struct sockaddr_in *)&state->ss;
 589                 psa->sin_port = htons(port);
 590                 state->salen = sizeof(struct sockaddr_in);
 591         }
 592
 593         if (pss->ss_family == AF_UNIX) {
 594                 state->salen = sizeof(struct sockaddr_un);
 595         }
 596
 597         print_sockaddr(addr, sizeof(addr), &state->ss);
 598         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 599
 600         subreq = async_connect_send(state, state->ev, state->fd,
 601                                     (struct sockaddr *)&state->ss,
 602                                     state->salen, NULL, NULL, NULL);
 603         if ((subreq == NULL)
 604             || !tevent_req_set_endtime(
 605                     subreq, state->ev,
 606                     timeval_current_ofs(0, state->wait_usec))) {
 607                 goto fail;
 608         }
 609         tevent_req_set_callback(subreq, open_socket_out_connected, result);
 610         return result;
 611
 612  post_status:
 613         tevent_req_nterror(result, status);
 614         return tevent_req_post(result, ev);
 615  fail:
 616         TALLOC_FREE(result);
 617         return NULL;
 618 }
 619
 620 static void open_socket_out_connected(struct tevent_req *subreq)
 621 {
 622         struct tevent_req *req =
 623                 tevent_req_callback_data(subreq, struct tevent_req);
 624         struct open_socket_out_state *state =
 625                 tevent_req_data(req, struct open_socket_out_state);
 626         int ret;
 627         int sys_errno;
 628
 629         ret = async_connect_recv(subreq, &sys_errno);
 630         TALLOC_FREE(subreq);
 631         if (ret == 0) {
 632                 tevent_req_done(req);
 633                 return;
 634         }
 635
 636         if (
 637 #ifdef ETIMEDOUT
 638                 (sys_errno == ETIMEDOUT) ||
 639 #endif
 640                 (sys_errno == EINPROGRESS) ||
 641                 (sys_errno == EALREADY) ||
 642                 (sys_errno == EAGAIN)) {
 643
 644                 /*
 645                  * retry
 646                  */
 647
 648                 if (state->wait_usec < 250000) {
 649                         state->wait_usec *= 1.5;
 650                 }
 651
 652                 subreq = async_connect_send(state, state->ev, state->fd,
 653                                             (struct sockaddr *)&state->ss,
 654                                             state->salen, NULL, NULL, NULL);
 655                 if (tevent_req_nomem(subreq, req)) {
 656                         return;
 657                 }
 658                 if (!tevent_req_set_endtime(
 659                             subreq, state->ev,
 660                             timeval_current_ofs_usec(state->wait_usec))) {
 661                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 662                         return;
 663                 }
 664                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
 665                 return;
 666         }
 667
 668 #ifdef EISCONN
 669         if (sys_errno == EISCONN) {
 670                 tevent_req_done(req);
 671                 return;
 672         }
 673 #endif
 674
 675         /* real error */
 676         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
 677 }
 678
 679 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
 680 {
 681         struct open_socket_out_state *state =
 682                 tevent_req_data(req, struct open_socket_out_state);
 683         NTSTATUS status;
 684
 685         if (tevent_req_is_nterror(req, &status)) {
 686                 return status;
 687         }
 688         *pfd = state->fd;
 689         state->fd = -1;
 690         return NT_STATUS_OK;
 691 }
 692
 693 /**
 694 * @brief open a socket
 695 *
 696 * @param pss a struct sockaddr_storage defining the address to connect to
 697 * @param port to connect to
 698 * @param timeout in MILLISECONDS
 699 * @param pfd file descriptor returned
 700 *
 701 * @return NTSTATUS code
 702 */
 703 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
 704                          int timeout, int *pfd)
 705 {
 706         TALLOC_CTX *frame = talloc_stackframe();
 707         struct tevent_context *ev;
 708         struct tevent_req *req;
 709         NTSTATUS status = NT_STATUS_NO_MEMORY;
 710
 711         ev = samba_tevent_context_init(frame);
 712         if (ev == NULL) {
 713                 goto fail;
 714         }
 715
 716         req = open_socket_out_send(frame, ev, pss, port, timeout);
 717         if (req == NULL) {
 718                 goto fail;
 719         }
 720         if (!tevent_req_poll(req, ev)) {
 721                 status = NT_STATUS_INTERNAL_ERROR;
 722                 goto fail;
 723         }
 724         status = open_socket_out_recv(req, pfd);
 725  fail:
 726         TALLOC_FREE(frame);
 727         return status;
 728 }
 729
 730 struct open_socket_out_defer_state {
 731         struct tevent_context *ev;
 732         struct sockaddr_storage ss;
 733         uint16_t port;
 734         int timeout;
 735         int fd;
 736 };
 737
 738 static void open_socket_out_defer_waited(struct tevent_req *subreq);
 739 static void open_socket_out_defer_connected(struct tevent_req *subreq);
 740
 741 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
 742                                               struct tevent_context *ev,
 743                                               struct timeval wait_time,
 744                                               const struct sockaddr_storage *pss,
 745                                               uint16_t port,
 746                                               int timeout)
 747 {
 748         struct tevent_req *req, *subreq;
 749         struct open_socket_out_defer_state *state;
 750
 751         req = tevent_req_create(mem_ctx, &state,
 752                                 struct open_socket_out_defer_state);
 753         if (req == NULL) {
 754                 return NULL;
 755         }
 756         state->ev = ev;
 757         state->ss = *pss;
 758         state->port = port;
 759         state->timeout = timeout;
 760
 761         subreq = tevent_wakeup_send(
 762                 state, ev,
 763                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
 764         if (subreq == NULL) {
 765                 goto fail;
 766         }
 767         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
 768         return req;
 769  fail:
 770         TALLOC_FREE(req);
 771         return NULL;
 772 }
 773
 774 static void open_socket_out_defer_waited(struct tevent_req *subreq)
 775 {
 776         struct tevent_req *req = tevent_req_callback_data(
 777                 subreq, struct tevent_req);
 778         struct open_socket_out_defer_state *state = tevent_req_data(
 779                 req, struct open_socket_out_defer_state);
 780         bool ret;
 781
 782         ret = tevent_wakeup_recv(subreq);
 783         TALLOC_FREE(subreq);
 784         if (!ret) {
 785                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 786                 return;
 787         }
 788
 789         subreq = open_socket_out_send(state, state->ev, &state->ss,
 790                                       state->port, state->timeout);
 791         if (tevent_req_nomem(subreq, req)) {
 792                 return;
 793         }
 794         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
 795 }
 796
 797 static void open_socket_out_defer_connected(struct tevent_req *subreq)
 798 {
 799         struct tevent_req *req = tevent_req_callback_data(
 800                 subreq, struct tevent_req);
 801         struct open_socket_out_defer_state *state = tevent_req_data(
 802                 req, struct open_socket_out_defer_state);
 803         NTSTATUS status;
 804
 805         status = open_socket_out_recv(subreq, &state->fd);
 806         TALLOC_FREE(subreq);
 807         if (!NT_STATUS_IS_OK(status)) {
 808                 tevent_req_nterror(req, status);
 809                 return;
 810         }
 811         tevent_req_done(req);
 812 }
 813
 814 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
 815 {
 816         struct open_socket_out_defer_state *state = tevent_req_data(
 817                 req, struct open_socket_out_defer_state);
 818         NTSTATUS status;
 819
 820         if (tevent_req_is_nterror(req, &status)) {
 821                 return status;
 822         }
 823         *pfd = state->fd;
 824         state->fd = -1;
 825         return NT_STATUS_OK;
 826 }
 827
 828 /****************************************************************************
 829  Open a connected UDP socket to host on port
 830 **************************************************************************/
 831
 832 int open_udp_socket(const char *host, int port)
 833 {
 834         struct sockaddr_storage ss;
 835         int res;
 836         socklen_t salen;
 837
 838         if (!interpret_string_addr(&ss, host, 0)) {
 839                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
 840                         host));
 841                 return -1;
 842         }
 843
 844         res = socket(ss.ss_family, SOCK_DGRAM, 0);
 845         if (res == -1) {
 846                 return -1;
 847         }
 848
 849 #if defined(HAVE_IPV6)
 850         if (ss.ss_family == AF_INET6) {
 851                 struct sockaddr_in6 *psa6;
 852                 psa6 = (struct sockaddr_in6 *)&ss;
 853                 psa6->sin6_port = htons(port);
 854                 if (psa6->sin6_scope_id == 0
 855                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 856                         setup_linklocal_scope_id(
 857                                 (struct sockaddr *)&ss);
 858                 }
 859                 salen = sizeof(struct sockaddr_in6);
 860         } else
 861 #endif
 862         if (ss.ss_family == AF_INET) {
 863                 struct sockaddr_in *psa;
 864                 psa = (struct sockaddr_in *)&ss;
 865                 psa->sin_port = htons(port);
 866             salen = sizeof(struct sockaddr_in);
 867         } else {
 868                 DEBUG(1, ("unknown socket family %d", ss.ss_family));
 869                 close(res);
 870                 return -1;
 871         }
 872
 873         if (connect(res, (struct sockaddr *)&ss, salen)) {
 874                 close(res);
 875                 return -1;
 876         }
 877
 878         return res;
 879 }
 880
 881 /*******************************************************************
 882  Return the IP addr of the remote end of a socket as a string.
 883  Optionally return the struct sockaddr_storage.
 884  ******************************************************************/
 885
 886 static const char *get_peer_addr_internal(int fd,
 887                                 char *addr_buf,
 888                                 size_t addr_buf_len,
 889                                 struct sockaddr *pss,
 890                                 socklen_t *plength)
 891 {
 892         struct sockaddr_storage ss;
 893         socklen_t length = sizeof(ss);
 894
 895         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
 896
 897         if (fd == -1) {
 898                 return addr_buf;
 899         }
 900
 901         if (pss == NULL) {
 902                 pss = (struct sockaddr *)&ss;
 903                 plength = &length;
 904         }
 905
 906         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
 907                 int level = (errno == ENOTCONN) ? 2 : 0;
 908                 DEBUG(level, ("getpeername failed. Error was %s\n",
 909                                strerror(errno)));
 910                 return addr_buf;
 911         }
 912
 913         print_sockaddr_len(addr_buf,
 914                         addr_buf_len,
 915                         pss,
 916                         *plength);
 917         return addr_buf;
 918 }
 919
 920 /*******************************************************************
 921  Matchname - determine if host name matches IP address. Used to
 922  confirm a hostname lookup to prevent spoof attacks.
 923 ******************************************************************/
 924
 925 static bool matchname(const char *remotehost,
 926                 const struct sockaddr *pss,
 927                 socklen_t len)
 928 {
 929         struct addrinfo *res = NULL;
 930         struct addrinfo *ailist = NULL;
 931         char addr_buf[INET6_ADDRSTRLEN];
 932         bool ret = interpret_string_addr_internal(&ailist,
 933                         remotehost,
 934                         AI_ADDRCONFIG|AI_CANONNAME);
 935
 936         if (!ret || ailist == NULL) {
 937                 DEBUG(3,("matchname: getaddrinfo failed for "
 938                         "name %s [%s]\n",
 939                         remotehost,
 940                         gai_strerror(ret) ));
 941                 return false;
 942         }
 943
 944         /*
 945          * Make sure that getaddrinfo() returns the "correct" host name.
 946          */
 947
 948         if (ailist->ai_canonname == NULL ||
 949                 (!strequal(remotehost, ailist->ai_canonname) &&
 950                  !strequal(remotehost, "localhost"))) {
 951                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
 952                          remotehost,
 953                          ailist->ai_canonname ?
 954                                  ailist->ai_canonname : "(NULL)"));
 955                 freeaddrinfo(ailist);
 956                 return false;
 957         }
 958
 959         /* Look up the host address in the address list we just got. */
 960         for (res = ailist; res; res = res->ai_next) {
 961                 if (!res->ai_addr) {
 962                         continue;
 963                 }
 964                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
 965                                         (const struct sockaddr *)pss)) {
 966                         freeaddrinfo(ailist);
 967                         return true;
 968                 }
 969         }
 970
 971         /*
 972          * The host name does not map to the original host address. Perhaps
 973          * someone has compromised a name server. More likely someone botched
 974          * it, but that could be dangerous, too.
 975          */
 976
 977         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
 978                 print_sockaddr_len(addr_buf,
 979                         sizeof(addr_buf),
 980                         pss,
 981                         len),
 982                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
 983
 984         if (ailist) {
 985                 freeaddrinfo(ailist);
 986         }
 987         return false;
 988 }
 989
 990 /*******************************************************************
 991  Deal with the singleton cache.
 992 ******************************************************************/
 993
 994 struct name_addr_pair {
 995         struct sockaddr_storage ss;
 996         const char *name;
 997 };
 998
 999 /*******************************************************************
1000  Lookup a name/addr pair. Returns memory allocated from memcache.
1001 ******************************************************************/
1002
1003 static bool lookup_nc(struct name_addr_pair *nc)
1004 {
1005         DATA_BLOB tmp;
1006
1007         ZERO_STRUCTP(nc);
1008
1009         if (!memcache_lookup(
1010                         NULL, SINGLETON_CACHE,
1011                         data_blob_string_const_null("get_peer_name"),
1012                         &tmp)) {
1013                 return false;
1014         }
1015
1016         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1017         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1018         return true;
1019 }
1020
1021 /*******************************************************************
1022  Save a name/addr pair.
1023 ******************************************************************/
1024
1025 static void store_nc(const struct name_addr_pair *nc)
1026 {
1027         DATA_BLOB tmp;
1028         size_t namelen = strlen(nc->name);
1029
1030         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1031         if (!tmp.data) {
1032                 return;
1033         }
1034         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1035         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1036
1037         memcache_add(NULL, SINGLETON_CACHE,
1038                         data_blob_string_const_null("get_peer_name"),
1039                         tmp);
1040         data_blob_free(&tmp);
1041 }
1042
1043 /*******************************************************************
1044  Return the IP addr of the remote end of a socket as a string.
1045  ******************************************************************/
1046
1047 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1048 {
1049         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1050 }
1051
1052 int get_remote_hostname(const struct tsocket_address *remote_address,
1053                         char **name,
1054                         TALLOC_CTX *mem_ctx)
1055 {
1056         char name_buf[MAX_DNS_NAME_LENGTH];
1057         char tmp_name[MAX_DNS_NAME_LENGTH];
1058         struct name_addr_pair nc;
1059         struct sockaddr_storage ss;
1060         ssize_t len;
1061         int rc;
1062
1063         if (!lp_hostname_lookups()) {
1064                 nc.name = tsocket_address_inet_addr_string(remote_address,
1065                                                            mem_ctx);
1066                 if (nc.name == NULL) {
1067                         return -1;
1068                 }
1069
1070                 len = tsocket_address_bsd_sockaddr(remote_address,
1071                                                    (struct sockaddr *) &nc.ss,
1072                                                    sizeof(struct sockaddr_storage));
1073                 if (len < 0) {
1074                         return -1;
1075                 }
1076
1077                 store_nc(&nc);
1078                 lookup_nc(&nc);
1079
1080                 if (nc.name == NULL) {
1081                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1082                 } else {
1083                         *name = talloc_strdup(mem_ctx, nc.name);
1084                 }
1085                 return 0;
1086         }
1087
1088         lookup_nc(&nc);
1089
1090         ZERO_STRUCT(ss);
1091
1092         len = tsocket_address_bsd_sockaddr(remote_address,
1093                                            (struct sockaddr *) &ss,
1094                                            sizeof(struct sockaddr_storage));
1095         if (len < 0) {
1096                 return -1;
1097         }
1098
1099         /* it might be the same as the last one - save some DNS work */
1100         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1101                 if (nc.name == NULL) {
1102                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1103                 } else {
1104                         *name = talloc_strdup(mem_ctx, nc.name);
1105                 }
1106                 return 0;
1107         }
1108
1109         /* Look up the remote host name. */
1110         rc = sys_getnameinfo((struct sockaddr *) &ss,
1111                              len,
1112                              name_buf,
1113                              sizeof(name_buf),
1114                              NULL,
1115                              0,
1116                              0);
1117         if (rc < 0) {
1118                 char *p;
1119
1120                 p = tsocket_address_inet_addr_string(remote_address, mem_ctx);
1121                 if (p == NULL) {
1122                         return -1;
1123                 }
1124
1125                 DEBUG(1,("getnameinfo failed for %s with error %s\n",
1126                          p,
1127                          gai_strerror(rc)));
1128                 strlcpy(name_buf, p, sizeof(name_buf));
1129
1130                 TALLOC_FREE(p);
1131         } else {
1132                 if (!matchname(name_buf, (struct sockaddr *)&ss, len)) {
1133                         DEBUG(0,("matchname failed on %s\n", name_buf));
1134                         strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1135                 }
1136         }
1137
1138         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1139         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1140         if (strstr(name_buf,"..")) {
1141                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1142         }
1143
1144         nc.name = name_buf;
1145         nc.ss = ss;
1146
1147         store_nc(&nc);
1148         lookup_nc(&nc);
1149
1150         if (nc.name == NULL) {
1151                 *name = talloc_strdup(mem_ctx, "UNKOWN");
1152         } else {
1153                 *name = talloc_strdup(mem_ctx, nc.name);
1154         }
1155
1156         return 0;
1157 }
1158
1159 /*******************************************************************
1160  Create protected unix domain socket.
1161
1162  Some unixes cannot set permissions on a ux-dom-sock, so we
1163  have to make sure that the directory contains the protection
1164  permissions instead.
1165  ******************************************************************/
1166
1167 int create_pipe_sock(const char *socket_dir,
1168                      const char *socket_name,
1169                      mode_t dir_perms)
1170 {
1171 #ifdef HAVE_UNIXSOCKET
1172         struct sockaddr_un sunaddr;
1173         bool ok;
1174         int sock = -1;
1175         mode_t old_umask;
1176         char *path = NULL;
1177
1178         old_umask = umask(0);
1179
1180         ok = directory_create_or_exist_strict(socket_dir,
1181                                               sec_initial_uid(),
1182                                               dir_perms);
1183         if (!ok) {
1184                 goto out_close;
1185         }
1186
1187         /* Create the socket file */
1188         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1189
1190         if (sock == -1) {
1191                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1192                         strerror(errno) ));
1193                 goto out_close;
1194         }
1195
1196         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1197                 goto out_close;
1198         }
1199
1200         unlink(path);
1201         memset(&sunaddr, 0, sizeof(sunaddr));
1202         sunaddr.sun_family = AF_UNIX;
1203         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1204
1205         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1206                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1207                         strerror(errno)));
1208                 goto out_close;
1209         }
1210
1211         SAFE_FREE(path);
1212
1213         umask(old_umask);
1214         return sock;
1215
1216 out_close:
1217         SAFE_FREE(path);
1218         if (sock != -1)
1219                 close(sock);
1220
1221         umask(old_umask);
1222         return -1;
1223
1224 #else
1225         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1226         return -1;
1227 #endif /* HAVE_UNIXSOCKET */
1228 }
1229
1230 /****************************************************************************
1231  Get my own canonical name, including domain.
1232 ****************************************************************************/
1233
1234 const char *get_mydnsfullname(void)
1235 {
1236         struct addrinfo *res = NULL;
1237         char my_hostname[HOST_NAME_MAX];
1238         bool ret;
1239         DATA_BLOB tmp;
1240
1241         if (memcache_lookup(NULL, SINGLETON_CACHE,
1242                         data_blob_string_const_null("get_mydnsfullname"),
1243                         &tmp)) {
1244                 SMB_ASSERT(tmp.length > 0);
1245                 return (const char *)tmp.data;
1246         }
1247
1248         /* get my host name */
1249         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1250                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1251                 return NULL;
1252         }
1253
1254         /* Ensure null termination. */
1255         my_hostname[sizeof(my_hostname)-1] = '\0';
1256
1257         ret = interpret_string_addr_internal(&res,
1258                                 my_hostname,
1259                                 AI_ADDRCONFIG|AI_CANONNAME);
1260
1261         if (!ret || res == NULL) {
1262                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1263                         "name %s [%s]\n",
1264                         my_hostname,
1265                         gai_strerror(ret) ));
1266                 return NULL;
1267         }
1268
1269         /*
1270          * Make sure that getaddrinfo() returns the "correct" host name.
1271          */
1272
1273         if (res->ai_canonname == NULL) {
1274                 DEBUG(3,("get_mydnsfullname: failed to get "
1275                         "canonical name for %s\n",
1276                         my_hostname));
1277                 freeaddrinfo(res);
1278                 return NULL;
1279         }
1280
1281         /* This copies the data, so we must do a lookup
1282          * afterwards to find the value to return.
1283          */
1284
1285         memcache_add(NULL, SINGLETON_CACHE,
1286                         data_blob_string_const_null("get_mydnsfullname"),
1287                         data_blob_string_const_null(res->ai_canonname));
1288
1289         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1290                         data_blob_string_const_null("get_mydnsfullname"),
1291                         &tmp)) {
1292                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1293                                 strlen(res->ai_canonname) + 1);
1294         }
1295
1296         freeaddrinfo(res);
1297
1298         return (const char *)tmp.data;
1299 }
1300
1301 /************************************************************
1302  Is this my ip address ?
1303 ************************************************************/
1304
1305 static bool is_my_ipaddr(const char *ipaddr_str)
1306 {
1307         struct sockaddr_storage ss;
1308         struct iface_struct *nics;
1309         int i, n;
1310
1311         if (!interpret_string_addr(&ss, ipaddr_str, AI_NUMERICHOST)) {
1312                 return false;
1313         }
1314
1315         if (is_zero_addr(&ss)) {
1316                 return false;
1317         }
1318
1319         if (ismyaddr((struct sockaddr *)&ss) ||
1320                         is_loopback_addr((struct sockaddr *)&ss)) {
1321                 return true;
1322         }
1323
1324         n = get_interfaces(talloc_tos(), &nics);
1325         for (i=0; i<n; i++) {
1326                 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1327                         TALLOC_FREE(nics);
1328                         return true;
1329                 }
1330         }
1331         TALLOC_FREE(nics);
1332         return false;
1333 }
1334
1335 /************************************************************
1336  Is this my name ?
1337 ************************************************************/
1338
1339 bool is_myname_or_ipaddr(const char *s)
1340 {
1341         TALLOC_CTX *ctx = talloc_tos();
1342         char *name = NULL;
1343         const char *dnsname;
1344         char *servername = NULL;
1345
1346         if (!s) {
1347                 return false;
1348         }
1349
1350         /* Santize the string from '\\name' */
1351         name = talloc_strdup(ctx, s);
1352         if (!name) {
1353                 return false;
1354         }
1355
1356         servername = strrchr_m(name, '\\' );
1357         if (!servername) {
1358                 servername = name;
1359         } else {
1360                 servername++;
1361         }
1362
1363         /* Optimize for the common case */
1364         if (strequal(servername, lp_netbios_name())) {
1365                 return true;
1366         }
1367
1368         /* Check for an alias */
1369         if (is_myname(servername)) {
1370                 return true;
1371         }
1372
1373         /* Check for loopback */
1374         if (strequal(servername, "127.0.0.1") ||
1375                         strequal(servername, "::1")) {
1376                 return true;
1377         }
1378
1379         if (strequal(servername, "localhost")) {
1380                 return true;
1381         }
1382
1383         /* Maybe it's my dns name */
1384         dnsname = get_mydnsfullname();
1385         if (dnsname && strequal(servername, dnsname)) {
1386                 return true;
1387         }
1388
1389         /* Maybe its an IP address? */
1390         if (is_ipaddress(servername)) {
1391                 return is_my_ipaddr(servername);
1392         }
1393
1394         /* Handle possible CNAME records - convert to an IP addr. list. */
1395         {
1396                 /* Use DNS to resolve the name, check all addresses. */
1397                 struct addrinfo *p = NULL;
1398                 struct addrinfo *res = NULL;
1399
1400                 if (!interpret_string_addr_internal(&res,
1401                                 servername,
1402                                 AI_ADDRCONFIG)) {
1403                         return false;
1404                 }
1405
1406                 for (p = res; p; p = p->ai_next) {
1407                         char addr[INET6_ADDRSTRLEN];
1408                         struct sockaddr_storage ss;
1409
1410                         ZERO_STRUCT(ss);
1411                         memcpy(&ss, p->ai_addr, p->ai_addrlen);
1412                         print_sockaddr(addr,
1413                                         sizeof(addr),
1414                                         &ss);
1415                         if (is_my_ipaddr(addr)) {
1416                                 freeaddrinfo(res);
1417                                 return true;
1418                         }
1419                 }
1420                 freeaddrinfo(res);
1421         }
1422
1423         /* No match */
1424         return false;
1425 }
1426
1427 struct getaddrinfo_state {
1428         const char *node;
1429         const char *service;
1430         const struct addrinfo *hints;
1431         struct addrinfo *res;
1432         int ret;
1433 };
1434
1435 static void getaddrinfo_do(void *private_data);
1436 static void getaddrinfo_done(struct tevent_req *subreq);
1437
1438 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1439                                     struct tevent_context *ev,
1440                                     struct fncall_context *ctx,
1441                                     const char *node,
1442                                     const char *service,
1443                                     const struct addrinfo *hints)
1444 {
1445         struct tevent_req *req, *subreq;
1446         struct getaddrinfo_state *state;
1447
1448         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1449         if (req == NULL) {
1450                 return NULL;
1451         }
1452
1453         state->node = node;
1454         state->service = service;
1455         state->hints = hints;
1456
1457         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1458         if (tevent_req_nomem(subreq, req)) {
1459                 return tevent_req_post(req, ev);
1460         }
1461         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1462         return req;
1463 }
1464
1465 static void getaddrinfo_do(void *private_data)
1466 {
1467         struct getaddrinfo_state *state =
1468                 (struct getaddrinfo_state *)private_data;
1469
1470         state->ret = getaddrinfo(state->node, state->service, state->hints,
1471                                  &state->res);
1472 }
1473
1474 static void getaddrinfo_done(struct tevent_req *subreq)
1475 {
1476         struct tevent_req *req = tevent_req_callback_data(
1477                 subreq, struct tevent_req);
1478         int ret, err;
1479
1480         ret = fncall_recv(subreq, &err);
1481         TALLOC_FREE(subreq);
1482         if (ret == -1) {
1483                 tevent_req_error(req, err);
1484                 return;
1485         }
1486         tevent_req_done(req);
1487 }
1488
1489 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1490 {
1491         struct getaddrinfo_state *state = tevent_req_data(
1492                 req, struct getaddrinfo_state);
1493         int err;
1494
1495         if (tevent_req_is_unix_error(req, &err)) {
1496                 switch(err) {
1497                 case ENOMEM:
1498                         return EAI_MEMORY;
1499                 default:
1500                         return EAI_FAIL;
1501                 }
1502         }
1503         if (state->ret == 0) {
1504                 *res = state->res;
1505         }
1506         return state->ret;
1507 }
1508
1509 int poll_one_fd(int fd, int events, int timeout, int *revents)
1510 {
1511         struct pollfd pfd;
1512         int ret;
1513
1514         pfd.fd = fd;
1515         pfd.events = events;
1516
1517         ret = poll(&pfd, 1, timeout);
1518
1519         /*
1520          * Assign whatever poll did, even in the ret<=0 case.
1521          */
1522         *revents = pfd.revents;
1523
1524         return ret;
1525 }
1526
1527 int poll_intr_one_fd(int fd, int events, int timeout, int *revents)
1528 {
1529         struct pollfd pfd;
1530         int ret;
1531
1532         pfd.fd = fd;
1533         pfd.events = events;
1534
1535         ret = sys_poll_intr(&pfd, 1, timeout);
1536         if (ret <= 0) {
1537                 *revents = 0;
1538                 return ret;
1539         }
1540         *revents = pfd.revents;
1541         return 1;
1542 }