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_name(int fd)
  33 {
  34         return get_peer_name(fd,false);
  35 }
  36
  37 const char *client_addr(int fd, char *addr, size_t addrlen)
  38 {
  39         return get_peer_addr(fd,addr,addrlen);
  40 }
  41
  42 #if 0
  43 /* Not currently used. JRA. */
  44 int client_socket_port(int fd)
  45 {
  46         return get_socket_port(fd);
  47 }
  48 #endif
  49
  50 /****************************************************************************
  51  Accessor functions to make thread-safe code easier later...
  52 ****************************************************************************/
  53
  54 void set_smb_read_error(enum smb_read_errors *pre,
  55                         enum smb_read_errors newerr)
  56 {
  57         if (pre) {
  58                 *pre = newerr;
  59         }
  60 }
  61
  62 void cond_set_smb_read_error(enum smb_read_errors *pre,
  63                         enum smb_read_errors newerr)
  64 {
  65         if (pre && *pre == SMB_READ_OK) {
  66                 *pre = newerr;
  67         }
  68 }
  69
  70 /****************************************************************************
  71  Determine if a file descriptor is in fact a socket.
  72 ****************************************************************************/
  73
  74 bool is_a_socket(int fd)
  75 {
  76         int v;
  77         socklen_t l;
  78         l = sizeof(int);
  79         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
  80 }
  81
  82 /****************************************************************************
  83  Read from a socket.
  84 ****************************************************************************/
  85
  86 ssize_t read_udp_v4_socket(int fd,
  87                         char *buf,
  88                         size_t len,
  89                         struct sockaddr_storage *psa)
  90 {
  91         ssize_t ret;
  92         socklen_t socklen = sizeof(*psa);
  93         struct sockaddr_in *si = (struct sockaddr_in *)psa;
  94
  95         memset((char *)psa,'\0',socklen);
  96
  97         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
  98                         (struct sockaddr *)psa,&socklen);
  99         if (ret <= 0) {
 100                 /* Don't print a low debug error for a non-blocking socket. */
 101                 if (errno == EAGAIN) {
 102                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 103                 } else {
 104                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 105                                 strerror(errno)));
 106                 }
 107                 return 0;
 108         }
 109
 110         if (psa->ss_family != AF_INET) {
 111                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 112                         "(not IPv4)\n", (int)psa->ss_family));
 113                 return 0;
 114         }
 115
 116         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 117                         inet_ntoa(si->sin_addr),
 118                         si->sin_port,
 119                         (unsigned long)ret));
 120
 121         return ret;
 122 }
 123
 124 /****************************************************************************
 125  Read data from a file descriptor with a timout in msec.
 126  mincount = if timeout, minimum to read before returning
 127  maxcount = number to be read.
 128  time_out = timeout in milliseconds
 129  NB. This can be called with a non-socket fd, don't change
 130  sys_read() to sys_recv() or other socket call.
 131 ****************************************************************************/
 132
 133 NTSTATUS read_fd_with_timeout(int fd, char *buf,
 134                                   size_t mincnt, size_t maxcnt,
 135                                   unsigned int time_out,
 136                                   size_t *size_ret)
 137 {
 138         int pollrtn;
 139         ssize_t readret;
 140         size_t nread = 0;
 141
 142         /* just checking .... */
 143         if (maxcnt <= 0)
 144                 return NT_STATUS_OK;
 145
 146         /* Blocking read */
 147         if (time_out == 0) {
 148                 if (mincnt == 0) {
 149                         mincnt = maxcnt;
 150                 }
 151
 152                 while (nread < mincnt) {
 153                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 154
 155                         if (readret == 0) {
 156                                 DEBUG(5,("read_fd_with_timeout: "
 157                                         "blocking read. EOF from client.\n"));
 158                                 return NT_STATUS_END_OF_FILE;
 159                         }
 160
 161                         if (readret == -1) {
 162                                 return map_nt_error_from_unix(errno);
 163                         }
 164                         nread += readret;
 165                 }
 166                 goto done;
 167         }
 168
 169         /* Most difficult - timeout read */
 170         /* If this is ever called on a disk file and
 171            mincnt is greater then the filesize then
 172            system performance will suffer severely as
 173            select always returns true on disk files */
 174
 175         for (nread=0; nread < mincnt; ) {
 176                 int revents;
 177
 178                 pollrtn = poll_intr_one_fd(fd, POLLIN|POLLHUP, time_out,
 179                                            &revents);
 180
 181                 /* Check if error */
 182                 if (pollrtn == -1) {
 183                         return map_nt_error_from_unix(errno);
 184                 }
 185
 186                 /* Did we timeout ? */
 187                 if ((pollrtn == 0) ||
 188                     ((revents & (POLLIN|POLLHUP|POLLERR)) == 0)) {
 189                         DEBUG(10,("read_fd_with_timeout: timeout read. "
 190                                 "select timed out.\n"));
 191                         return NT_STATUS_IO_TIMEOUT;
 192                 }
 193
 194                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 195
 196                 if (readret == 0) {
 197                         /* we got EOF on the file descriptor */
 198                         DEBUG(5,("read_fd_with_timeout: timeout read. "
 199                                 "EOF from client.\n"));
 200                         return NT_STATUS_END_OF_FILE;
 201                 }
 202
 203                 if (readret == -1) {
 204                         return map_nt_error_from_unix(errno);
 205                 }
 206
 207                 nread += readret;
 208         }
 209
 210  done:
 211         /* Return the number we got */
 212         if (size_ret) {
 213                 *size_ret = nread;
 214         }
 215         return NT_STATUS_OK;
 216 }
 217
 218 /****************************************************************************
 219  Read data from an fd, reading exactly N bytes.
 220  NB. This can be called with a non-socket fd, don't add dependencies
 221  on socket calls.
 222 ****************************************************************************/
 223
 224 NTSTATUS read_data(int fd, char *buffer, size_t N)
 225 {
 226         return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
 227 }
 228
 229 /****************************************************************************
 230  Write all data from an iov array
 231  NB. This can be called with a non-socket fd, don't add dependencies
 232  on socket calls.
 233 ****************************************************************************/
 234
 235 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 236 {
 237         int i;
 238         size_t to_send;
 239         ssize_t thistime;
 240         size_t sent;
 241         struct iovec *iov_copy, *iov;
 242
 243         to_send = 0;
 244         for (i=0; i<iovcnt; i++) {
 245                 to_send += orig_iov[i].iov_len;
 246         }
 247
 248         thistime = sys_writev(fd, orig_iov, iovcnt);
 249         if ((thistime <= 0) || (thistime == to_send)) {
 250                 return thistime;
 251         }
 252         sent = thistime;
 253
 254         /*
 255          * We could not send everything in one call. Make a copy of iov that
 256          * we can mess with. We keep a copy of the array start in iov_copy for
 257          * the TALLOC_FREE, because we're going to modify iov later on,
 258          * discarding elements.
 259          */
 260
 261         iov_copy = (struct iovec *)talloc_memdup(
 262                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 263
 264         if (iov_copy == NULL) {
 265                 errno = ENOMEM;
 266                 return -1;
 267         }
 268         iov = iov_copy;
 269
 270         while (sent < to_send) {
 271                 /*
 272                  * We have to discard "thistime" bytes from the beginning
 273                  * iov array, "thistime" contains the number of bytes sent
 274                  * via writev last.
 275                  */
 276                 while (thistime > 0) {
 277                         if (thistime < iov[0].iov_len) {
 278                                 char *new_base =
 279                                         (char *)iov[0].iov_base + thistime;
 280                                 iov[0].iov_base = (void *)new_base;
 281                                 iov[0].iov_len -= thistime;
 282                                 break;
 283                         }
 284                         thistime -= iov[0].iov_len;
 285                         iov += 1;
 286                         iovcnt -= 1;
 287                 }
 288
 289                 thistime = sys_writev(fd, iov, iovcnt);
 290                 if (thistime <= 0) {
 291                         break;
 292                 }
 293                 sent += thistime;
 294         }
 295
 296         TALLOC_FREE(iov_copy);
 297         return sent;
 298 }
 299
 300 /****************************************************************************
 301  Write data to a fd.
 302  NB. This can be called with a non-socket fd, don't add dependencies
 303  on socket calls.
 304 ****************************************************************************/
 305
 306 ssize_t write_data(int fd, const char *buffer, size_t N)
 307 {
 308         struct iovec iov;
 309
 310         iov.iov_base = discard_const_p(void, buffer);
 311         iov.iov_len = N;
 312         return write_data_iov(fd, &iov, 1);
 313 }
 314
 315 /****************************************************************************
 316  Send a keepalive packet (rfc1002).
 317 ****************************************************************************/
 318
 319 bool send_keepalive(int client)
 320 {
 321         unsigned char buf[4];
 322
 323         buf[0] = SMBkeepalive;
 324         buf[1] = buf[2] = buf[3] = 0;
 325
 326         return(write_data(client,(char *)buf,4) == 4);
 327 }
 328
 329 /****************************************************************************
 330  Read 4 bytes of a smb packet and return the smb length of the packet.
 331  Store the result in the buffer.
 332  This version of the function will return a length of zero on receiving
 333  a keepalive packet.
 334  Timeout is in milliseconds.
 335 ****************************************************************************/
 336
 337 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 338                                           unsigned int timeout,
 339                                           size_t *len)
 340 {
 341         int msg_type;
 342         NTSTATUS status;
 343
 344         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 345
 346         if (!NT_STATUS_IS_OK(status)) {
 347                 return status;
 348         }
 349
 350         *len = smb_len(inbuf);
 351         msg_type = CVAL(inbuf,0);
 352
 353         if (msg_type == SMBkeepalive) {
 354                 DEBUG(5,("Got keepalive packet\n"));
 355         }
 356
 357         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 358
 359         return NT_STATUS_OK;
 360 }
 361
 362 /****************************************************************************
 363  Read an smb from a fd.
 364  The timeout is in milliseconds.
 365  This function will return on receipt of a session keepalive packet.
 366  maxlen is the max number of bytes to return, not including the 4 byte
 367  length. If zero it means buflen limit.
 368  Doesn't check the MAC on signed packets.
 369 ****************************************************************************/
 370
 371 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 372                          size_t maxlen, size_t *p_len)
 373 {
 374         size_t len;
 375         NTSTATUS status;
 376
 377         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 378
 379         if (!NT_STATUS_IS_OK(status)) {
 380                 DEBUG(0, ("read_fd_with_timeout failed, read "
 381                           "error = %s.\n", nt_errstr(status)));
 382                 return status;
 383         }
 384
 385         if (len > buflen) {
 386                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 387                                         (unsigned long)len));
 388                 return NT_STATUS_INVALID_PARAMETER;
 389         }
 390
 391         if(len > 0) {
 392                 if (maxlen) {
 393                         len = MIN(len,maxlen);
 394                 }
 395
 396                 status = read_fd_with_timeout(
 397                         fd, buffer+4, len, len, timeout, &len);
 398
 399                 if (!NT_STATUS_IS_OK(status)) {
 400                         DEBUG(0, ("read_fd_with_timeout failed, read error = "
 401                                   "%s.\n", nt_errstr(status)));
 402                         return status;
 403                 }
 404
 405                 /* not all of samba3 properly checks for packet-termination
 406                  * of strings. This ensures that we don't run off into
 407                  * empty space. */
 408                 SSVAL(buffer+4,len, 0);
 409         }
 410
 411         *p_len = len;
 412         return NT_STATUS_OK;
 413 }
 414
 415 /****************************************************************************
 416  Open a socket of the specified type, port, and address for incoming data.
 417 ****************************************************************************/
 418
 419 int open_socket_in(int type,
 420                 uint16_t port,
 421                 int dlevel,
 422                 const struct sockaddr_storage *psock,
 423                 bool rebind)
 424 {
 425         struct sockaddr_storage sock;
 426         int res;
 427         socklen_t slen = sizeof(struct sockaddr_in);
 428
 429         sock = *psock;
 430
 431 #if defined(HAVE_IPV6)
 432         if (sock.ss_family == AF_INET6) {
 433                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 434                 slen = sizeof(struct sockaddr_in6);
 435         }
 436 #endif
 437         if (sock.ss_family == AF_INET) {
 438                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 439         }
 440
 441         res = socket(sock.ss_family, type, 0 );
 442         if( res == -1 ) {
 443                 if( DEBUGLVL(0) ) {
 444                         dbgtext( "open_socket_in(): socket() call failed: " );
 445                         dbgtext( "%s\n", strerror( errno ) );
 446                 }
 447                 return -1;
 448         }
 449
 450         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 451         {
 452                 int val = rebind ? 1 : 0;
 453                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 454                                         (char *)&val,sizeof(val)) == -1 ) {
 455                         if( DEBUGLVL( dlevel ) ) {
 456                                 dbgtext( "open_socket_in(): setsockopt: " );
 457                                 dbgtext( "SO_REUSEADDR = %s ",
 458                                                 val?"true":"false" );
 459                                 dbgtext( "on port %d failed ", port );
 460                                 dbgtext( "with error = %s\n", strerror(errno) );
 461                         }
 462                 }
 463 #ifdef SO_REUSEPORT
 464                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 465                                         (char *)&val,sizeof(val)) == -1 ) {
 466                         if( DEBUGLVL( dlevel ) ) {
 467                                 dbgtext( "open_socket_in(): setsockopt: ");
 468                                 dbgtext( "SO_REUSEPORT = %s ",
 469                                                 val?"true":"false");
 470                                 dbgtext( "on port %d failed ", port);
 471                                 dbgtext( "with error = %s\n", strerror(errno));
 472                         }
 473                 }
 474 #endif /* SO_REUSEPORT */
 475         }
 476
 477 #ifdef HAVE_IPV6
 478         /*
 479          * As IPV6_V6ONLY is the default on some systems,
 480          * we better try to be consistent and always use it.
 481          *
 482          * This also avoids using IPv4 via AF_INET6 sockets
 483          * and makes sure %I never resolves to a '::ffff:192.168.0.1'
 484          * string.
 485          */
 486         if (sock.ss_family == AF_INET6) {
 487                 int val = 1;
 488                 int ret;
 489
 490                 ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY,
 491                                  (const void *)&val, sizeof(val));
 492                 if (ret == -1) {
 493                         if(DEBUGLVL(0)) {
 494                                 dbgtext("open_socket_in(): IPV6_ONLY failed: ");
 495                                 dbgtext("%s\n", strerror(errno));
 496                         }
 497                         close(res);
 498                         return -1;
 499                 }
 500         }
 501 #endif
 502
 503         /* now we've got a socket - we need to bind it */
 504         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 505                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 506                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 507                         char addr[INET6_ADDRSTRLEN];
 508                         print_sockaddr(addr, sizeof(addr),
 509                                         &sock);
 510                         dbgtext( "bind failed on port %d ", port);
 511                         dbgtext( "socket_addr = %s.\n", addr);
 512                         dbgtext( "Error = %s\n", strerror(errno));
 513                 }
 514                 close(res);
 515                 return -1;
 516         }
 517
 518         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 519         return( res );
 520  }
 521
 522 struct open_socket_out_state {
 523         int fd;
 524         struct event_context *ev;
 525         struct sockaddr_storage ss;
 526         socklen_t salen;
 527         uint16_t port;
 528         int wait_usec;
 529 };
 530
 531 static void open_socket_out_connected(struct tevent_req *subreq);
 532
 533 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 534 {
 535         if (s->fd != -1) {
 536                 close(s->fd);
 537         }
 538         return 0;
 539 }
 540
 541 /****************************************************************************
 542  Create an outgoing socket. timeout is in milliseconds.
 543 **************************************************************************/
 544
 545 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 546                                         struct event_context *ev,
 547                                         const struct sockaddr_storage *pss,
 548                                         uint16_t port,
 549                                         int timeout)
 550 {
 551         char addr[INET6_ADDRSTRLEN];
 552         struct tevent_req *result, *subreq;
 553         struct open_socket_out_state *state;
 554         NTSTATUS status;
 555
 556         result = tevent_req_create(mem_ctx, &state,
 557                                    struct open_socket_out_state);
 558         if (result == NULL) {
 559                 return NULL;
 560         }
 561         state->ev = ev;
 562         state->ss = *pss;
 563         state->port = port;
 564         state->wait_usec = 10000;
 565         state->salen = -1;
 566
 567         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 568         if (state->fd == -1) {
 569                 status = map_nt_error_from_unix(errno);
 570                 goto post_status;
 571         }
 572         talloc_set_destructor(state, open_socket_out_state_destructor);
 573
 574         if (!tevent_req_set_endtime(
 575                     result, ev, timeval_current_ofs_msec(timeout))) {
 576                 goto fail;
 577         }
 578
 579 #if defined(HAVE_IPV6)
 580         if (pss->ss_family == AF_INET6) {
 581                 struct sockaddr_in6 *psa6;
 582                 psa6 = (struct sockaddr_in6 *)&state->ss;
 583                 psa6->sin6_port = htons(port);
 584                 if (psa6->sin6_scope_id == 0
 585                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 586                         setup_linklocal_scope_id(
 587                                 (struct sockaddr *)&(state->ss));
 588                 }
 589                 state->salen = sizeof(struct sockaddr_in6);
 590         }
 591 #endif
 592         if (pss->ss_family == AF_INET) {
 593                 struct sockaddr_in *psa;
 594                 psa = (struct sockaddr_in *)&state->ss;
 595                 psa->sin_port = htons(port);
 596                 state->salen = sizeof(struct sockaddr_in);
 597         }
 598
 599         if (pss->ss_family == AF_UNIX) {
 600                 state->salen = sizeof(struct sockaddr_un);
 601         }
 602
 603         print_sockaddr(addr, sizeof(addr), &state->ss);
 604         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 605
 606         subreq = async_connect_send(state, state->ev, state->fd,
 607                                     (struct sockaddr *)&state->ss,
 608                                     state->salen);
 609         if ((subreq == NULL)
 610             || !tevent_req_set_endtime(
 611                     subreq, state->ev,
 612                     timeval_current_ofs(0, state->wait_usec))) {
 613                 goto fail;
 614         }
 615         tevent_req_set_callback(subreq, open_socket_out_connected, result);
 616         return result;
 617
 618  post_status:
 619         tevent_req_nterror(result, status);
 620         return tevent_req_post(result, ev);
 621  fail:
 622         TALLOC_FREE(result);
 623         return NULL;
 624 }
 625
 626 static void open_socket_out_connected(struct tevent_req *subreq)
 627 {
 628         struct tevent_req *req =
 629                 tevent_req_callback_data(subreq, struct tevent_req);
 630         struct open_socket_out_state *state =
 631                 tevent_req_data(req, struct open_socket_out_state);
 632         int ret;
 633         int sys_errno;
 634
 635         ret = async_connect_recv(subreq, &sys_errno);
 636         TALLOC_FREE(subreq);
 637         if (ret == 0) {
 638                 tevent_req_done(req);
 639                 return;
 640         }
 641
 642         if (
 643 #ifdef ETIMEDOUT
 644                 (sys_errno == ETIMEDOUT) ||
 645 #endif
 646                 (sys_errno == EINPROGRESS) ||
 647                 (sys_errno == EALREADY) ||
 648                 (sys_errno == EAGAIN)) {
 649
 650                 /*
 651                  * retry
 652                  */
 653
 654                 if (state->wait_usec < 250000) {
 655                         state->wait_usec *= 1.5;
 656                 }
 657
 658                 subreq = async_connect_send(state, state->ev, state->fd,
 659                                             (struct sockaddr *)&state->ss,
 660                                             state->salen);
 661                 if (tevent_req_nomem(subreq, req)) {
 662                         return;
 663                 }
 664                 if (!tevent_req_set_endtime(
 665                             subreq, state->ev,
 666                             timeval_current_ofs_usec(state->wait_usec))) {
 667                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 668                         return;
 669                 }
 670                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
 671                 return;
 672         }
 673
 674 #ifdef EISCONN
 675         if (sys_errno == EISCONN) {
 676                 tevent_req_done(req);
 677                 return;
 678         }
 679 #endif
 680
 681         /* real error */
 682         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
 683 }
 684
 685 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
 686 {
 687         struct open_socket_out_state *state =
 688                 tevent_req_data(req, struct open_socket_out_state);
 689         NTSTATUS status;
 690
 691         if (tevent_req_is_nterror(req, &status)) {
 692                 return status;
 693         }
 694         *pfd = state->fd;
 695         state->fd = -1;
 696         return NT_STATUS_OK;
 697 }
 698
 699 /**
 700 * @brief open a socket
 701 *
 702 * @param pss a struct sockaddr_storage defining the address to connect to
 703 * @param port to connect to
 704 * @param timeout in MILLISECONDS
 705 * @param pfd file descriptor returned
 706 *
 707 * @return NTSTATUS code
 708 */
 709 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
 710                          int timeout, int *pfd)
 711 {
 712         TALLOC_CTX *frame = talloc_stackframe();
 713         struct event_context *ev;
 714         struct tevent_req *req;
 715         NTSTATUS status = NT_STATUS_NO_MEMORY;
 716
 717         ev = event_context_init(frame);
 718         if (ev == NULL) {
 719                 goto fail;
 720         }
 721
 722         req = open_socket_out_send(frame, ev, pss, port, timeout);
 723         if (req == NULL) {
 724                 goto fail;
 725         }
 726         if (!tevent_req_poll(req, ev)) {
 727                 status = NT_STATUS_INTERNAL_ERROR;
 728                 goto fail;
 729         }
 730         status = open_socket_out_recv(req, pfd);
 731  fail:
 732         TALLOC_FREE(frame);
 733         return status;
 734 }
 735
 736 struct open_socket_out_defer_state {
 737         struct event_context *ev;
 738         struct sockaddr_storage ss;
 739         uint16_t port;
 740         int timeout;
 741         int fd;
 742 };
 743
 744 static void open_socket_out_defer_waited(struct tevent_req *subreq);
 745 static void open_socket_out_defer_connected(struct tevent_req *subreq);
 746
 747 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
 748                                               struct event_context *ev,
 749                                               struct timeval wait_time,
 750                                               const struct sockaddr_storage *pss,
 751                                               uint16_t port,
 752                                               int timeout)
 753 {
 754         struct tevent_req *req, *subreq;
 755         struct open_socket_out_defer_state *state;
 756
 757         req = tevent_req_create(mem_ctx, &state,
 758                                 struct open_socket_out_defer_state);
 759         if (req == NULL) {
 760                 return NULL;
 761         }
 762         state->ev = ev;
 763         state->ss = *pss;
 764         state->port = port;
 765         state->timeout = timeout;
 766
 767         subreq = tevent_wakeup_send(
 768                 state, ev,
 769                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
 770         if (subreq == NULL) {
 771                 goto fail;
 772         }
 773         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
 774         return req;
 775  fail:
 776         TALLOC_FREE(req);
 777         return NULL;
 778 }
 779
 780 static void open_socket_out_defer_waited(struct tevent_req *subreq)
 781 {
 782         struct tevent_req *req = tevent_req_callback_data(
 783                 subreq, struct tevent_req);
 784         struct open_socket_out_defer_state *state = tevent_req_data(
 785                 req, struct open_socket_out_defer_state);
 786         bool ret;
 787
 788         ret = tevent_wakeup_recv(subreq);
 789         TALLOC_FREE(subreq);
 790         if (!ret) {
 791                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 792                 return;
 793         }
 794
 795         subreq = open_socket_out_send(state, state->ev, &state->ss,
 796                                       state->port, state->timeout);
 797         if (tevent_req_nomem(subreq, req)) {
 798                 return;
 799         }
 800         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
 801 }
 802
 803 static void open_socket_out_defer_connected(struct tevent_req *subreq)
 804 {
 805         struct tevent_req *req = tevent_req_callback_data(
 806                 subreq, struct tevent_req);
 807         struct open_socket_out_defer_state *state = tevent_req_data(
 808                 req, struct open_socket_out_defer_state);
 809         NTSTATUS status;
 810
 811         status = open_socket_out_recv(subreq, &state->fd);
 812         TALLOC_FREE(subreq);
 813         if (!NT_STATUS_IS_OK(status)) {
 814                 tevent_req_nterror(req, status);
 815                 return;
 816         }
 817         tevent_req_done(req);
 818 }
 819
 820 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
 821 {
 822         struct open_socket_out_defer_state *state = tevent_req_data(
 823                 req, struct open_socket_out_defer_state);
 824         NTSTATUS status;
 825
 826         if (tevent_req_is_nterror(req, &status)) {
 827                 return status;
 828         }
 829         *pfd = state->fd;
 830         state->fd = -1;
 831         return NT_STATUS_OK;
 832 }
 833
 834 /****************************************************************************
 835  Open a connected UDP socket to host on port
 836 **************************************************************************/
 837
 838 int open_udp_socket(const char *host, int port)
 839 {
 840         struct sockaddr_storage ss;
 841         int res;
 842
 843         if (!interpret_string_addr(&ss, host, 0)) {
 844                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
 845                         host));
 846                 return -1;
 847         }
 848
 849         res = socket(ss.ss_family, SOCK_DGRAM, 0);
 850         if (res == -1) {
 851                 return -1;
 852         }
 853
 854 #if defined(HAVE_IPV6)
 855         if (ss.ss_family == AF_INET6) {
 856                 struct sockaddr_in6 *psa6;
 857                 psa6 = (struct sockaddr_in6 *)&ss;
 858                 psa6->sin6_port = htons(port);
 859                 if (psa6->sin6_scope_id == 0
 860                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 861                         setup_linklocal_scope_id(
 862                                 (struct sockaddr *)&ss);
 863                 }
 864         }
 865 #endif
 866         if (ss.ss_family == AF_INET) {
 867                 struct sockaddr_in *psa;
 868                 psa = (struct sockaddr_in *)&ss;
 869                 psa->sin_port = htons(port);
 870         }
 871
 872         if (sys_connect(res,(struct sockaddr *)&ss)) {
 873                 close(res);
 874                 return -1;
 875         }
 876
 877         return res;
 878 }
 879
 880 /*******************************************************************
 881  Return the IP addr of the remote end of a socket as a string.
 882  Optionally return the struct sockaddr_storage.
 883  ******************************************************************/
 884
 885 static const char *get_peer_addr_internal(int fd,
 886                                 char *addr_buf,
 887                                 size_t addr_buf_len,
 888                                 struct sockaddr *pss,
 889                                 socklen_t *plength)
 890 {
 891         struct sockaddr_storage ss;
 892         socklen_t length = sizeof(ss);
 893
 894         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
 895
 896         if (fd == -1) {
 897                 return addr_buf;
 898         }
 899
 900         if (pss == NULL) {
 901                 pss = (struct sockaddr *)&ss;
 902                 plength = &length;
 903         }
 904
 905         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
 906                 int level = (errno == ENOTCONN) ? 2 : 0;
 907                 DEBUG(level, ("getpeername failed. Error was %s\n",
 908                                strerror(errno)));
 909                 return addr_buf;
 910         }
 911
 912         print_sockaddr_len(addr_buf,
 913                         addr_buf_len,
 914                         pss,
 915                         *plength);
 916         return addr_buf;
 917 }
 918
 919 /*******************************************************************
 920  Matchname - determine if host name matches IP address. Used to
 921  confirm a hostname lookup to prevent spoof attacks.
 922 ******************************************************************/
 923
 924 static bool matchname(const char *remotehost,
 925                 const struct sockaddr *pss,
 926                 socklen_t len)
 927 {
 928         struct addrinfo *res = NULL;
 929         struct addrinfo *ailist = NULL;
 930         char addr_buf[INET6_ADDRSTRLEN];
 931         bool ret = interpret_string_addr_internal(&ailist,
 932                         remotehost,
 933                         AI_ADDRCONFIG|AI_CANONNAME);
 934
 935         if (!ret || ailist == NULL) {
 936                 DEBUG(3,("matchname: getaddrinfo failed for "
 937                         "name %s [%s]\n",
 938                         remotehost,
 939                         gai_strerror(ret) ));
 940                 return false;
 941         }
 942
 943         /*
 944          * Make sure that getaddrinfo() returns the "correct" host name.
 945          */
 946
 947         if (ailist->ai_canonname == NULL ||
 948                 (!strequal(remotehost, ailist->ai_canonname) &&
 949                  !strequal(remotehost, "localhost"))) {
 950                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
 951                          remotehost,
 952                          ailist->ai_canonname ?
 953                                  ailist->ai_canonname : "(NULL)"));
 954                 freeaddrinfo(ailist);
 955                 return false;
 956         }
 957
 958         /* Look up the host address in the address list we just got. */
 959         for (res = ailist; res; res = res->ai_next) {
 960                 if (!res->ai_addr) {
 961                         continue;
 962                 }
 963                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
 964                                         (const struct sockaddr *)pss)) {
 965                         freeaddrinfo(ailist);
 966                         return true;
 967                 }
 968         }
 969
 970         /*
 971          * The host name does not map to the original host address. Perhaps
 972          * someone has compromised a name server. More likely someone botched
 973          * it, but that could be dangerous, too.
 974          */
 975
 976         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
 977                 print_sockaddr_len(addr_buf,
 978                         sizeof(addr_buf),
 979                         pss,
 980                         len),
 981                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
 982
 983         if (ailist) {
 984                 freeaddrinfo(ailist);
 985         }
 986         return false;
 987 }
 988
 989 /*******************************************************************
 990  Deal with the singleton cache.
 991 ******************************************************************/
 992
 993 struct name_addr_pair {
 994         struct sockaddr_storage ss;
 995         const char *name;
 996 };
 997
 998 /*******************************************************************
 999  Lookup a name/addr pair. Returns memory allocated from memcache.
1000 ******************************************************************/
1001
1002 static bool lookup_nc(struct name_addr_pair *nc)
1003 {
1004         DATA_BLOB tmp;
1005
1006         ZERO_STRUCTP(nc);
1007
1008         if (!memcache_lookup(
1009                         NULL, SINGLETON_CACHE,
1010                         data_blob_string_const_null("get_peer_name"),
1011                         &tmp)) {
1012                 return false;
1013         }
1014
1015         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1016         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1017         return true;
1018 }
1019
1020 /*******************************************************************
1021  Save a name/addr pair.
1022 ******************************************************************/
1023
1024 static void store_nc(const struct name_addr_pair *nc)
1025 {
1026         DATA_BLOB tmp;
1027         size_t namelen = strlen(nc->name);
1028
1029         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1030         if (!tmp.data) {
1031                 return;
1032         }
1033         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1034         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1035
1036         memcache_add(NULL, SINGLETON_CACHE,
1037                         data_blob_string_const_null("get_peer_name"),
1038                         tmp);
1039         data_blob_free(&tmp);
1040 }
1041
1042 /*******************************************************************
1043  Return the DNS name of the remote end of a socket.
1044 ******************************************************************/
1045
1046 const char *get_peer_name(int fd, bool force_lookup)
1047 {
1048         struct name_addr_pair nc;
1049         char addr_buf[INET6_ADDRSTRLEN];
1050         struct sockaddr_storage ss;
1051         socklen_t length = sizeof(ss);
1052         const char *p;
1053         int ret;
1054         char name_buf[MAX_DNS_NAME_LENGTH];
1055         char tmp_name[MAX_DNS_NAME_LENGTH];
1056
1057         /* reverse lookups can be *very* expensive, and in many
1058            situations won't work because many networks don't link dhcp
1059            with dns. To avoid the delay we avoid the lookup if
1060            possible */
1061         if (!lp_hostname_lookups() && (force_lookup == false)) {
1062                 length = sizeof(nc.ss);
1063                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1064                         (struct sockaddr *)&nc.ss, &length);
1065                 store_nc(&nc);
1066                 lookup_nc(&nc);
1067                 return nc.name ? nc.name : "UNKNOWN";
1068         }
1069
1070         lookup_nc(&nc);
1071
1072         memset(&ss, '\0', sizeof(ss));
1073         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1074
1075         /* it might be the same as the last one - save some DNS work */
1076         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1077                 return nc.name ? nc.name : "UNKNOWN";
1078         }
1079
1080         /* Not the same. We need to lookup. */
1081         if (fd == -1) {
1082                 return "UNKNOWN";
1083         }
1084
1085         /* Look up the remote host name. */
1086         ret = sys_getnameinfo((struct sockaddr *)&ss,
1087                         length,
1088                         name_buf,
1089                         sizeof(name_buf),
1090                         NULL,
1091                         0,
1092                         0);
1093
1094         if (ret) {
1095                 DEBUG(1,("get_peer_name: getnameinfo failed "
1096                         "for %s with error %s\n",
1097                         p,
1098                         gai_strerror(ret)));
1099                 strlcpy(name_buf, p, sizeof(name_buf));
1100         } else {
1101                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1102                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1103                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1104                 }
1105         }
1106
1107         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1108         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1109         if (strstr(name_buf,"..")) {
1110                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1111         }
1112
1113         nc.name = name_buf;
1114         nc.ss = ss;
1115
1116         store_nc(&nc);
1117         lookup_nc(&nc);
1118         return nc.name ? nc.name : "UNKNOWN";
1119 }
1120
1121 /*******************************************************************
1122  Return the IP addr of the remote end of a socket as a string.
1123  ******************************************************************/
1124
1125 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1126 {
1127         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1128 }
1129
1130 int get_remote_hostname(const struct tsocket_address *remote_address,
1131                         char **name,
1132                         TALLOC_CTX *mem_ctx)
1133 {
1134         char name_buf[MAX_DNS_NAME_LENGTH];
1135         char tmp_name[MAX_DNS_NAME_LENGTH];
1136         struct name_addr_pair nc;
1137         struct sockaddr_storage ss;
1138         socklen_t len;
1139         int rc;
1140
1141         if (!lp_hostname_lookups()) {
1142                 nc.name = tsocket_address_inet_addr_string(remote_address,
1143                                                            mem_ctx);
1144                 if (nc.name == NULL) {
1145                         return -1;
1146                 }
1147
1148                 len = tsocket_address_bsd_sockaddr(remote_address,
1149                                                    (struct sockaddr *) &nc.ss,
1150                                                    sizeof(struct sockaddr_storage));
1151                 if (len < 0) {
1152                         return -1;
1153                 }
1154
1155                 store_nc(&nc);
1156                 lookup_nc(&nc);
1157
1158                 if (nc.name == NULL) {
1159                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1160                 } else {
1161                         *name = talloc_strdup(mem_ctx, nc.name);
1162                 }
1163                 return 0;
1164         }
1165
1166         lookup_nc(&nc);
1167
1168         ZERO_STRUCT(ss);
1169
1170         len = tsocket_address_bsd_sockaddr(remote_address,
1171                                            (struct sockaddr *) &ss,
1172                                            sizeof(struct sockaddr_storage));
1173         if (len < 0) {
1174                 return -1;
1175         }
1176
1177         /* it might be the same as the last one - save some DNS work */
1178         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1179                 if (nc.name == NULL) {
1180                         *name = talloc_strdup(mem_ctx, "UNKNOWN");
1181                 } else {
1182                         *name = talloc_strdup(mem_ctx, nc.name);
1183                 }
1184                 return 0;
1185         }
1186
1187         /* Look up the remote host name. */
1188         rc = sys_getnameinfo((struct sockaddr *) &ss,
1189                              len,
1190                              name_buf,
1191                              sizeof(name_buf),
1192                              NULL,
1193                              0,
1194                              0);
1195         if (rc < 0) {
1196                 char *p;
1197
1198                 p = tsocket_address_inet_addr_string(remote_address, mem_ctx);
1199                 if (p == NULL) {
1200                         return -1;
1201                 }
1202
1203                 DEBUG(1,("getnameinfo failed for %s with error %s\n",
1204                          p,
1205                          gai_strerror(rc)));
1206                 strlcpy(name_buf, p, sizeof(name_buf));
1207
1208                 talloc_free(p);
1209         } else {
1210                 if (!matchname(name_buf, (struct sockaddr *)&ss, len)) {
1211                         DEBUG(0,("matchname failed on %s\n", name_buf));
1212                         strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1213                 }
1214         }
1215
1216         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1217         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1218         if (strstr(name_buf,"..")) {
1219                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1220         }
1221
1222         nc.name = name_buf;
1223         nc.ss = ss;
1224
1225         store_nc(&nc);
1226         lookup_nc(&nc);
1227
1228         if (nc.name == NULL) {
1229                 *name = talloc_strdup(mem_ctx, "UNKOWN");
1230         } else {
1231                 *name = talloc_strdup(mem_ctx, nc.name);
1232         }
1233
1234         return 0;
1235 }
1236
1237 /*******************************************************************
1238  Create protected unix domain socket.
1239
1240  Some unixes cannot set permissions on a ux-dom-sock, so we
1241  have to make sure that the directory contains the protection
1242  permissions instead.
1243  ******************************************************************/
1244
1245 int create_pipe_sock(const char *socket_dir,
1246                      const char *socket_name,
1247                      mode_t dir_perms)
1248 {
1249 #ifdef HAVE_UNIXSOCKET
1250         struct sockaddr_un sunaddr;
1251         struct stat st;
1252         int sock;
1253         mode_t old_umask;
1254         char *path = NULL;
1255
1256         old_umask = umask(0);
1257
1258         /* Create the socket directory or reuse the existing one */
1259
1260         if (lstat(socket_dir, &st) == -1) {
1261                 if (errno == ENOENT) {
1262                         /* Create directory */
1263                         if (mkdir(socket_dir, dir_perms) == -1) {
1264                                 DEBUG(0, ("error creating socket directory "
1265                                         "%s: %s\n", socket_dir,
1266                                         strerror(errno)));
1267                                 goto out_umask;
1268                         }
1269                 } else {
1270                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1271                                 socket_dir, strerror(errno)));
1272                         goto out_umask;
1273                 }
1274         } else {
1275                 /* Check ownership and permission on existing directory */
1276                 if (!S_ISDIR(st.st_mode)) {
1277                         DEBUG(0, ("socket directory '%s' isn't a directory\n",
1278                                 socket_dir));
1279                         goto out_umask;
1280                 }
1281                 if (st.st_uid != sec_initial_uid()) {
1282                         DEBUG(0, ("invalid ownership on directory "
1283                                   "'%s'\n", socket_dir));
1284                         umask(old_umask);
1285                         goto out_umask;
1286                 }
1287                 if ((st.st_mode & 0777) != dir_perms) {
1288                         DEBUG(0, ("invalid permissions on directory "
1289                                   "'%s': has 0%o should be 0%o\n", socket_dir,
1290                                   (st.st_mode & 0777), dir_perms));
1291                         umask(old_umask);
1292                         goto out_umask;
1293                 }
1294         }
1295
1296         /* Create the socket file */
1297
1298         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1299
1300         if (sock == -1) {
1301                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1302                         strerror(errno) ));
1303                 goto out_close;
1304         }
1305
1306         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1307                 goto out_close;
1308         }
1309
1310         unlink(path);
1311         memset(&sunaddr, 0, sizeof(sunaddr));
1312         sunaddr.sun_family = AF_UNIX;
1313         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1314
1315         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1316                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1317                         strerror(errno)));
1318                 goto out_close;
1319         }
1320
1321         if (listen(sock, 5) == -1) {
1322                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1323                         strerror(errno)));
1324                 goto out_close;
1325         }
1326
1327         SAFE_FREE(path);
1328
1329         umask(old_umask);
1330         return sock;
1331
1332 out_close:
1333         SAFE_FREE(path);
1334         if (sock != -1)
1335                 close(sock);
1336
1337 out_umask:
1338         umask(old_umask);
1339         return -1;
1340
1341 #else
1342         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1343         return -1;
1344 #endif /* HAVE_UNIXSOCKET */
1345 }
1346
1347 /****************************************************************************
1348  Get my own canonical name, including domain.
1349 ****************************************************************************/
1350
1351 const char *get_mydnsfullname(void)
1352 {
1353         struct addrinfo *res = NULL;
1354         char my_hostname[HOST_NAME_MAX];
1355         bool ret;
1356         DATA_BLOB tmp;
1357
1358         if (memcache_lookup(NULL, SINGLETON_CACHE,
1359                         data_blob_string_const_null("get_mydnsfullname"),
1360                         &tmp)) {
1361                 SMB_ASSERT(tmp.length > 0);
1362                 return (const char *)tmp.data;
1363         }
1364
1365         /* get my host name */
1366         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1367                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1368                 return NULL;
1369         }
1370
1371         /* Ensure null termination. */
1372         my_hostname[sizeof(my_hostname)-1] = '\0';
1373
1374         ret = interpret_string_addr_internal(&res,
1375                                 my_hostname,
1376                                 AI_ADDRCONFIG|AI_CANONNAME);
1377
1378         if (!ret || res == NULL) {
1379                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1380                         "name %s [%s]\n",
1381                         my_hostname,
1382                         gai_strerror(ret) ));
1383                 return NULL;
1384         }
1385
1386         /*
1387          * Make sure that getaddrinfo() returns the "correct" host name.
1388          */
1389
1390         if (res->ai_canonname == NULL) {
1391                 DEBUG(3,("get_mydnsfullname: failed to get "
1392                         "canonical name for %s\n",
1393                         my_hostname));
1394                 freeaddrinfo(res);
1395                 return NULL;
1396         }
1397
1398         /* This copies the data, so we must do a lookup
1399          * afterwards to find the value to return.
1400          */
1401
1402         memcache_add(NULL, SINGLETON_CACHE,
1403                         data_blob_string_const_null("get_mydnsfullname"),
1404                         data_blob_string_const_null(res->ai_canonname));
1405
1406         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1407                         data_blob_string_const_null("get_mydnsfullname"),
1408                         &tmp)) {
1409                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1410                                 strlen(res->ai_canonname) + 1);
1411         }
1412
1413         freeaddrinfo(res);
1414
1415         return (const char *)tmp.data;
1416 }
1417
1418 /************************************************************
1419  Is this my ip address ?
1420 ************************************************************/
1421
1422 static bool is_my_ipaddr(const char *ipaddr_str)
1423 {
1424         struct sockaddr_storage ss;
1425         struct iface_struct *nics;
1426         int i, n;
1427
1428         if (!interpret_string_addr(&ss, ipaddr_str, AI_NUMERICHOST)) {
1429                 return false;
1430         }
1431
1432         if (is_zero_addr(&ss)) {
1433                 return false;
1434         }
1435
1436         if (ismyaddr((struct sockaddr *)&ss) ||
1437                         is_loopback_addr((struct sockaddr *)&ss)) {
1438                 return true;
1439         }
1440
1441         n = get_interfaces(talloc_tos(), &nics);
1442         for (i=0; i<n; i++) {
1443                 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1444                         TALLOC_FREE(nics);
1445                         return true;
1446                 }
1447         }
1448         TALLOC_FREE(nics);
1449         return false;
1450 }
1451
1452 /************************************************************
1453  Is this my name ?
1454 ************************************************************/
1455
1456 bool is_myname_or_ipaddr(const char *s)
1457 {
1458         TALLOC_CTX *ctx = talloc_tos();
1459         char *name = NULL;
1460         const char *dnsname;
1461         char *servername = NULL;
1462
1463         if (!s) {
1464                 return false;
1465         }
1466
1467         /* Santize the string from '\\name' */
1468         name = talloc_strdup(ctx, s);
1469         if (!name) {
1470                 return false;
1471         }
1472
1473         servername = strrchr_m(name, '\\' );
1474         if (!servername) {
1475                 servername = name;
1476         } else {
1477                 servername++;
1478         }
1479
1480         /* Optimize for the common case */
1481         if (strequal(servername, lp_netbios_name())) {
1482                 return true;
1483         }
1484
1485         /* Check for an alias */
1486         if (is_myname(servername)) {
1487                 return true;
1488         }
1489
1490         /* Check for loopback */
1491         if (strequal(servername, "127.0.0.1") ||
1492                         strequal(servername, "::1")) {
1493                 return true;
1494         }
1495
1496         if (strequal(servername, "localhost")) {
1497                 return true;
1498         }
1499
1500         /* Maybe it's my dns name */
1501         dnsname = get_mydnsfullname();
1502         if (dnsname && strequal(servername, dnsname)) {
1503                 return true;
1504         }
1505
1506         /* Maybe its an IP address? */
1507         if (is_ipaddress(servername)) {
1508                 return is_my_ipaddr(servername);
1509         }
1510
1511         /* Handle possible CNAME records - convert to an IP addr. list. */
1512         {
1513                 /* Use DNS to resolve the name, check all addresses. */
1514                 struct addrinfo *p = NULL;
1515                 struct addrinfo *res = NULL;
1516
1517                 if (!interpret_string_addr_internal(&res,
1518                                 servername,
1519                                 AI_ADDRCONFIG)) {
1520                         return false;
1521                 }
1522
1523                 for (p = res; p; p = p->ai_next) {
1524                         char addr[INET6_ADDRSTRLEN];
1525                         struct sockaddr_storage ss;
1526
1527                         ZERO_STRUCT(ss);
1528                         memcpy(&ss, p->ai_addr, p->ai_addrlen);
1529                         print_sockaddr(addr,
1530                                         sizeof(addr),
1531                                         &ss);
1532                         if (is_my_ipaddr(addr)) {
1533                                 freeaddrinfo(res);
1534                                 return true;
1535                         }
1536                 }
1537                 freeaddrinfo(res);
1538         }
1539
1540         /* No match */
1541         return false;
1542 }
1543
1544 struct getaddrinfo_state {
1545         const char *node;
1546         const char *service;
1547         const struct addrinfo *hints;
1548         struct addrinfo *res;
1549         int ret;
1550 };
1551
1552 static void getaddrinfo_do(void *private_data);
1553 static void getaddrinfo_done(struct tevent_req *subreq);
1554
1555 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1556                                     struct tevent_context *ev,
1557                                     struct fncall_context *ctx,
1558                                     const char *node,
1559                                     const char *service,
1560                                     const struct addrinfo *hints)
1561 {
1562         struct tevent_req *req, *subreq;
1563         struct getaddrinfo_state *state;
1564
1565         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1566         if (req == NULL) {
1567                 return NULL;
1568         }
1569
1570         state->node = node;
1571         state->service = service;
1572         state->hints = hints;
1573
1574         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1575         if (tevent_req_nomem(subreq, req)) {
1576                 return tevent_req_post(req, ev);
1577         }
1578         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1579         return req;
1580 }
1581
1582 static void getaddrinfo_do(void *private_data)
1583 {
1584         struct getaddrinfo_state *state =
1585                 (struct getaddrinfo_state *)private_data;
1586
1587         state->ret = getaddrinfo(state->node, state->service, state->hints,
1588                                  &state->res);
1589 }
1590
1591 static void getaddrinfo_done(struct tevent_req *subreq)
1592 {
1593         struct tevent_req *req = tevent_req_callback_data(
1594                 subreq, struct tevent_req);
1595         int ret, err;
1596
1597         ret = fncall_recv(subreq, &err);
1598         TALLOC_FREE(subreq);
1599         if (ret == -1) {
1600                 tevent_req_error(req, err);
1601                 return;
1602         }
1603         tevent_req_done(req);
1604 }
1605
1606 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1607 {
1608         struct getaddrinfo_state *state = tevent_req_data(
1609                 req, struct getaddrinfo_state);
1610         int err;
1611
1612         if (tevent_req_is_unix_error(req, &err)) {
1613                 switch(err) {
1614                 case ENOMEM:
1615                         return EAI_MEMORY;
1616                 default:
1617                         return EAI_FAIL;
1618                 }
1619         }
1620         if (state->ret == 0) {
1621                 *res = state->res;
1622         }
1623         return state->ret;
1624 }
1625
1626 int poll_one_fd(int fd, int events, int timeout, int *revents)
1627 {
1628         struct pollfd *fds;
1629         int ret;
1630         int saved_errno;
1631
1632         fds = talloc_zero_array(talloc_tos(), struct pollfd, 2);
1633         if (fds == NULL) {
1634                 errno = ENOMEM;
1635                 return -1;
1636         }
1637         fds[0].fd = fd;
1638         fds[0].events = events;
1639
1640         ret = sys_poll(fds, 1, timeout);
1641
1642         /*
1643          * Assign whatever poll did, even in the ret<=0 case.
1644          */
1645         *revents = fds[0].revents;
1646         saved_errno = errno;
1647         TALLOC_FREE(fds);
1648         errno = saved_errno;
1649
1650         return ret;
1651 }
1652
1653 int poll_intr_one_fd(int fd, int events, int timeout, int *revents)
1654 {
1655         struct pollfd pfd;
1656         int ret;
1657
1658         pfd.fd = fd;
1659         pfd.events = events;
1660
1661         ret = sys_poll_intr(&pfd, 1, timeout);
1662         if (ret <= 0) {
1663                 *revents = 0;
1664                 return ret;
1665         }
1666         *revents = pfd.revents;
1667         return 1;
1668 }