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
  24 /****************************************************************************
  25  Get a port number in host byte order from a sockaddr_storage.
  26 ****************************************************************************/
  27
  28 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
  29 {
  30         uint16_t port = 0;
  31
  32         if (pss->ss_family != AF_INET) {
  33 #if defined(HAVE_IPV6)
  34                 /* IPv6 */
  35                 const struct sockaddr_in6 *sa6 =
  36                         (const struct sockaddr_in6 *)pss;
  37                 port = ntohs(sa6->sin6_port);
  38 #endif
  39         } else {
  40                 const struct sockaddr_in *sa =
  41                         (const struct sockaddr_in *)pss;
  42                 port = ntohs(sa->sin_port);
  43         }
  44         return port;
  45 }
  46
  47 /****************************************************************************
  48  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
  49 ****************************************************************************/
  50
  51 static char *print_sockaddr_len(char *dest,
  52                         size_t destlen,
  53                         const struct sockaddr *psa,
  54                         socklen_t psalen)
  55 {
  56         if (destlen > 0) {
  57                 dest[0] = '\0';
  58         }
  59         (void)sys_getnameinfo(psa,
  60                         psalen,
  61                         dest, destlen,
  62                         NULL, 0,
  63                         NI_NUMERICHOST);
  64         return dest;
  65 }
  66
  67 /****************************************************************************
  68  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
  69 ****************************************************************************/
  70
  71 char *print_sockaddr(char *dest,
  72                         size_t destlen,
  73                         const struct sockaddr_storage *psa)
  74 {
  75         return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
  76                         sizeof(struct sockaddr_storage));
  77 }
  78
  79 /****************************************************************************
  80  Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
  81 ****************************************************************************/
  82
  83 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
  84                         const struct sockaddr_storage *pss)
  85 {
  86         char addr[INET6_ADDRSTRLEN];
  87         char *dest = NULL;
  88         int ret;
  89
  90         /* Linux getnameinfo() man pages says port is unitialized if
  91            service name is NULL. */
  92
  93         ret = sys_getnameinfo((const struct sockaddr *)pss,
  94                         sizeof(struct sockaddr_storage),
  95                         addr, sizeof(addr),
  96                         NULL, 0,
  97                         NI_NUMERICHOST);
  98         if (ret != 0) {
  99                 return NULL;
 100         }
 101
 102         if (pss->ss_family != AF_INET) {
 103 #if defined(HAVE_IPV6)
 104                 dest = talloc_asprintf(ctx, "[%s]", addr);
 105 #else
 106                 return NULL;
 107 #endif
 108         } else {
 109                 dest = talloc_asprintf(ctx, "%s", addr);
 110         }
 111
 112         return dest;
 113 }
 114
 115 /****************************************************************************
 116  Return the string of an IP address (IPv4 or IPv6).
 117 ****************************************************************************/
 118
 119 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
 120 {
 121         struct sockaddr_storage sa;
 122         socklen_t length = sizeof(sa);
 123
 124         /* Ok, returning a hard coded IPv4 address
 125          * is bogus, but it's just as bogus as a
 126          * zero IPv6 address. No good choice here.
 127          */
 128
 129         strlcpy(addr_buf, "0.0.0.0", addr_len);
 130
 131         if (fd == -1) {
 132                 return addr_buf;
 133         }
 134
 135         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 136                 DEBUG(0,("getsockname failed. Error was %s\n",
 137                         strerror(errno) ));
 138                 return addr_buf;
 139         }
 140
 141         return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
 142 }
 143
 144 /****************************************************************************
 145  Return the port number we've bound to on a socket.
 146 ****************************************************************************/
 147
 148 int get_socket_port(int fd)
 149 {
 150         struct sockaddr_storage sa;
 151         socklen_t length = sizeof(sa);
 152
 153         if (fd == -1) {
 154                 return -1;
 155         }
 156
 157         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 158                 int level = (errno == ENOTCONN) ? 2 : 0;
 159                 DEBUG(level, ("getpeername failed. Error was %s\n",
 160                                strerror(errno)));
 161                 return -1;
 162         }
 163
 164 #if defined(HAVE_IPV6)
 165         if (sa.ss_family == AF_INET6) {
 166                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
 167         }
 168 #endif
 169         if (sa.ss_family == AF_INET) {
 170                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
 171         }
 172         return -1;
 173 }
 174
 175 const char *client_name(int fd)
 176 {
 177         return get_peer_name(fd,false);
 178 }
 179
 180 const char *client_addr(int fd, char *addr, size_t addrlen)
 181 {
 182         return get_peer_addr(fd,addr,addrlen);
 183 }
 184
 185 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
 186 {
 187         return get_socket_addr(fd, addr, addr_len);
 188 }
 189
 190 #if 0
 191 /* Not currently used. JRA. */
 192 int client_socket_port(int fd)
 193 {
 194         return get_socket_port(fd);
 195 }
 196 #endif
 197
 198 /****************************************************************************
 199  Accessor functions to make thread-safe code easier later...
 200 ****************************************************************************/
 201
 202 void set_smb_read_error(enum smb_read_errors *pre,
 203                         enum smb_read_errors newerr)
 204 {
 205         if (pre) {
 206                 *pre = newerr;
 207         }
 208 }
 209
 210 void cond_set_smb_read_error(enum smb_read_errors *pre,
 211                         enum smb_read_errors newerr)
 212 {
 213         if (pre && *pre == SMB_READ_OK) {
 214                 *pre = newerr;
 215         }
 216 }
 217
 218 /****************************************************************************
 219  Determine if a file descriptor is in fact a socket.
 220 ****************************************************************************/
 221
 222 bool is_a_socket(int fd)
 223 {
 224         int v;
 225         socklen_t l;
 226         l = sizeof(int);
 227         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
 228 }
 229
 230 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
 231
 232 typedef struct smb_socket_option {
 233         const char *name;
 234         int level;
 235         int option;
 236         int value;
 237         int opttype;
 238 } smb_socket_option;
 239
 240 static const smb_socket_option socket_options[] = {
 241   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
 242   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
 243   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
 244 #ifdef TCP_NODELAY
 245   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
 246 #endif
 247 #ifdef TCP_KEEPCNT
 248   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
 249 #endif
 250 #ifdef TCP_KEEPIDLE
 251   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
 252 #endif
 253 #ifdef TCP_KEEPINTVL
 254   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
 255 #endif
 256 #ifdef IPTOS_LOWDELAY
 257   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
 258 #endif
 259 #ifdef IPTOS_THROUGHPUT
 260   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
 261 #endif
 262 #ifdef SO_REUSEPORT
 263   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
 264 #endif
 265 #ifdef SO_SNDBUF
 266   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
 267 #endif
 268 #ifdef SO_RCVBUF
 269   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
 270 #endif
 271 #ifdef SO_SNDLOWAT
 272   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
 273 #endif
 274 #ifdef SO_RCVLOWAT
 275   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
 276 #endif
 277 #ifdef SO_SNDTIMEO
 278   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
 279 #endif
 280 #ifdef SO_RCVTIMEO
 281   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
 282 #endif
 283 #ifdef TCP_FASTACK
 284   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
 285 #endif
 286 #ifdef TCP_QUICKACK
 287   {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL},
 288 #endif
 289   {NULL,0,0,0,0}};
 290
 291 /****************************************************************************
 292  Print socket options.
 293 ****************************************************************************/
 294
 295 static void print_socket_options(int s)
 296 {
 297         int value;
 298         socklen_t vlen = 4;
 299         const smb_socket_option *p = &socket_options[0];
 300
 301         /* wrapped in if statement to prevent streams
 302          * leak in SCO Openserver 5.0 */
 303         /* reported on samba-technical  --jerry */
 304         if ( DEBUGLEVEL >= 5 ) {
 305                 DEBUG(5,("Socket options:\n"));
 306                 for (; p->name != NULL; p++) {
 307                         if (getsockopt(s, p->level, p->option,
 308                                                 (void *)&value, &vlen) == -1) {
 309                                 DEBUGADD(5,("\tCould not test socket option %s.\n",
 310                                                         p->name));
 311                         } else {
 312                                 DEBUGADD(5,("\t%s = %d\n",
 313                                                         p->name,value));
 314                         }
 315                 }
 316         }
 317  }
 318
 319 /****************************************************************************
 320  Set user socket options.
 321 ****************************************************************************/
 322
 323 void set_socket_options(int fd, const char *options)
 324 {
 325         TALLOC_CTX *ctx = talloc_stackframe();
 326         char *tok;
 327
 328         while (next_token_talloc(ctx, &options, &tok," \t,")) {
 329                 int ret=0,i;
 330                 int value = 1;
 331                 char *p;
 332                 bool got_value = false;
 333
 334                 if ((p = strchr_m(tok,'='))) {
 335                         *p = 0;
 336                         value = atoi(p+1);
 337                         got_value = true;
 338                 }
 339
 340                 for (i=0;socket_options[i].name;i++)
 341                         if (strequal(socket_options[i].name,tok))
 342                                 break;
 343
 344                 if (!socket_options[i].name) {
 345                         DEBUG(0,("Unknown socket option %s\n",tok));
 346                         continue;
 347                 }
 348
 349                 switch (socket_options[i].opttype) {
 350                 case OPT_BOOL:
 351                 case OPT_INT:
 352                         ret = setsockopt(fd,socket_options[i].level,
 353                                         socket_options[i].option,
 354                                         (char *)&value,sizeof(int));
 355                         break;
 356
 357                 case OPT_ON:
 358                         if (got_value)
 359                                 DEBUG(0,("syntax error - %s "
 360                                         "does not take a value\n",tok));
 361
 362                         {
 363                                 int on = socket_options[i].value;
 364                                 ret = setsockopt(fd,socket_options[i].level,
 365                                         socket_options[i].option,
 366                                         (char *)&on,sizeof(int));
 367                         }
 368                         break;
 369                 }
 370
 371                 if (ret != 0) {
 372                         /* be aware that some systems like Solaris return
 373                          * EINVAL to a setsockopt() call when the client
 374                          * sent a RST previously - no need to worry */
 375                         DEBUG(2,("Failed to set socket option %s (Error %s)\n",
 376                                 tok, strerror(errno) ));
 377                 }
 378         }
 379
 380         TALLOC_FREE(ctx);
 381         print_socket_options(fd);
 382 }
 383
 384 /****************************************************************************
 385  Read from a socket.
 386 ****************************************************************************/
 387
 388 ssize_t read_udp_v4_socket(int fd,
 389                         char *buf,
 390                         size_t len,
 391                         struct sockaddr_storage *psa)
 392 {
 393         ssize_t ret;
 394         socklen_t socklen = sizeof(*psa);
 395         struct sockaddr_in *si = (struct sockaddr_in *)psa;
 396
 397         memset((char *)psa,'\0',socklen);
 398
 399         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
 400                         (struct sockaddr *)psa,&socklen);
 401         if (ret <= 0) {
 402                 /* Don't print a low debug error for a non-blocking socket. */
 403                 if (errno == EAGAIN) {
 404                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 405                 } else {
 406                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 407                                 strerror(errno)));
 408                 }
 409                 return 0;
 410         }
 411
 412         if (psa->ss_family != AF_INET) {
 413                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 414                         "(not IPv4)\n", (int)psa->ss_family));
 415                 return 0;
 416         }
 417
 418         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 419                         inet_ntoa(si->sin_addr),
 420                         si->sin_port,
 421                         (unsigned long)ret));
 422
 423         return ret;
 424 }
 425
 426 /****************************************************************************
 427  Read data from a file descriptor with a timout in msec.
 428  mincount = if timeout, minimum to read before returning
 429  maxcount = number to be read.
 430  time_out = timeout in milliseconds
 431  NB. This can be called with a non-socket fd, don't change
 432  sys_read() to sys_recv() or other socket call.
 433 ****************************************************************************/
 434
 435 NTSTATUS read_fd_with_timeout(int fd, char *buf,
 436                                   size_t mincnt, size_t maxcnt,
 437                                   unsigned int time_out,
 438                                   size_t *size_ret)
 439 {
 440         fd_set fds;
 441         int selrtn;
 442         ssize_t readret;
 443         size_t nread = 0;
 444         struct timeval timeout;
 445         int save_errno;
 446
 447         /* just checking .... */
 448         if (maxcnt <= 0)
 449                 return NT_STATUS_OK;
 450
 451         /* Blocking read */
 452         if (time_out == 0) {
 453                 if (mincnt == 0) {
 454                         mincnt = maxcnt;
 455                 }
 456
 457                 while (nread < mincnt) {
 458                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 459
 460                         if (readret == 0) {
 461                                 DEBUG(5,("read_fd_with_timeout: "
 462                                         "blocking read. EOF from client.\n"));
 463                                 return NT_STATUS_END_OF_FILE;
 464                         }
 465
 466                         if (readret == -1) {
 467                                 return map_nt_error_from_unix(save_errno);
 468                         }
 469                         nread += readret;
 470                 }
 471                 goto done;
 472         }
 473
 474         /* Most difficult - timeout read */
 475         /* If this is ever called on a disk file and
 476            mincnt is greater then the filesize then
 477            system performance will suffer severely as
 478            select always returns true on disk files */
 479
 480         /* Set initial timeout */
 481         timeout.tv_sec = (time_t)(time_out / 1000);
 482         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 483
 484         for (nread=0; nread < mincnt; ) {
 485                 FD_ZERO(&fds);
 486                 FD_SET(fd,&fds);
 487
 488                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 489
 490                 /* Check if error */
 491                 if (selrtn == -1) {
 492                         return map_nt_error_from_unix(save_errno);
 493                 }
 494
 495                 /* Did we timeout ? */
 496                 if (selrtn == 0) {
 497                         DEBUG(10,("read_fd_with_timeout: timeout read. "
 498                                 "select timed out.\n"));
 499                         return NT_STATUS_IO_TIMEOUT;
 500                 }
 501
 502                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 503
 504                 if (readret == 0) {
 505                         /* we got EOF on the file descriptor */
 506                         DEBUG(5,("read_fd_with_timeout: timeout read. "
 507                                 "EOF from client.\n"));
 508                         return NT_STATUS_END_OF_FILE;
 509                 }
 510
 511                 if (readret == -1) {
 512                         return map_nt_error_from_unix(errno);
 513                 }
 514
 515                 nread += readret;
 516         }
 517
 518  done:
 519         /* Return the number we got */
 520         if (size_ret) {
 521                 *size_ret = nread;
 522         }
 523         return NT_STATUS_OK;
 524 }
 525
 526 /****************************************************************************
 527  Read data from an fd, reading exactly N bytes.
 528  NB. This can be called with a non-socket fd, don't add dependencies
 529  on socket calls.
 530 ****************************************************************************/
 531
 532 NTSTATUS read_data(int fd, char *buffer, size_t N)
 533 {
 534         return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
 535 }
 536
 537 /****************************************************************************
 538  Write all data from an iov array
 539  NB. This can be called with a non-socket fd, don't add dependencies
 540  on socket calls.
 541 ****************************************************************************/
 542
 543 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 544 {
 545         int i;
 546         size_t to_send;
 547         ssize_t thistime;
 548         size_t sent;
 549         struct iovec *iov_copy, *iov;
 550
 551         to_send = 0;
 552         for (i=0; i<iovcnt; i++) {
 553                 to_send += orig_iov[i].iov_len;
 554         }
 555
 556         thistime = sys_writev(fd, orig_iov, iovcnt);
 557         if ((thistime <= 0) || (thistime == to_send)) {
 558                 return thistime;
 559         }
 560         sent = thistime;
 561
 562         /*
 563          * We could not send everything in one call. Make a copy of iov that
 564          * we can mess with. We keep a copy of the array start in iov_copy for
 565          * the TALLOC_FREE, because we're going to modify iov later on,
 566          * discarding elements.
 567          */
 568
 569         iov_copy = (struct iovec *)TALLOC_MEMDUP(
 570                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 571
 572         if (iov_copy == NULL) {
 573                 errno = ENOMEM;
 574                 return -1;
 575         }
 576         iov = iov_copy;
 577
 578         while (sent < to_send) {
 579                 /*
 580                  * We have to discard "thistime" bytes from the beginning
 581                  * iov array, "thistime" contains the number of bytes sent
 582                  * via writev last.
 583                  */
 584                 while (thistime > 0) {
 585                         if (thistime < iov[0].iov_len) {
 586                                 char *new_base =
 587                                         (char *)iov[0].iov_base + thistime;
 588                                 iov[0].iov_base = (void *)new_base;
 589                                 iov[0].iov_len -= thistime;
 590                                 break;
 591                         }
 592                         thistime -= iov[0].iov_len;
 593                         iov += 1;
 594                         iovcnt -= 1;
 595                 }
 596
 597                 thistime = sys_writev(fd, iov, iovcnt);
 598                 if (thistime <= 0) {
 599                         break;
 600                 }
 601                 sent += thistime;
 602         }
 603
 604         TALLOC_FREE(iov_copy);
 605         return sent;
 606 }
 607
 608 /****************************************************************************
 609  Write data to a fd.
 610  NB. This can be called with a non-socket fd, don't add dependencies
 611  on socket calls.
 612 ****************************************************************************/
 613
 614 ssize_t write_data(int fd, const char *buffer, size_t N)
 615 {
 616         struct iovec iov;
 617
 618         iov.iov_base = CONST_DISCARD(void *, buffer);
 619         iov.iov_len = N;
 620         return write_data_iov(fd, &iov, 1);
 621 }
 622
 623 /****************************************************************************
 624  Send a keepalive packet (rfc1002).
 625 ****************************************************************************/
 626
 627 bool send_keepalive(int client)
 628 {
 629         unsigned char buf[4];
 630
 631         buf[0] = SMBkeepalive;
 632         buf[1] = buf[2] = buf[3] = 0;
 633
 634         return(write_data(client,(char *)buf,4) == 4);
 635 }
 636
 637 /****************************************************************************
 638  Read 4 bytes of a smb packet and return the smb length of the packet.
 639  Store the result in the buffer.
 640  This version of the function will return a length of zero on receiving
 641  a keepalive packet.
 642  Timeout is in milliseconds.
 643 ****************************************************************************/
 644
 645 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 646                                           unsigned int timeout,
 647                                           size_t *len)
 648 {
 649         int msg_type;
 650         NTSTATUS status;
 651
 652         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 653
 654         if (!NT_STATUS_IS_OK(status)) {
 655                 if (fd == smbd_server_fd()) {
 656                         char addr[INET6_ADDRSTRLEN];
 657                         /* Try and give an error message
 658                          * saying what client failed. */
 659                         DEBUG(0, ("read_fd_with_timeout failed for "
 660                                   "client %s read error = %s.\n",
 661                                   get_peer_addr(fd,addr,sizeof(addr)),
 662                                   nt_errstr(status)));
 663                 } else {
 664                         DEBUG(0, ("read_fd_with_timeout failed, read error = "
 665                                   "%s.\n", nt_errstr(status)));
 666                 }
 667                 return status;
 668         }
 669
 670         *len = smb_len(inbuf);
 671         msg_type = CVAL(inbuf,0);
 672
 673         if (msg_type == SMBkeepalive) {
 674                 DEBUG(5,("Got keepalive packet\n"));
 675         }
 676
 677         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 678
 679         return NT_STATUS_OK;
 680 }
 681
 682 /****************************************************************************
 683  Read 4 bytes of a smb packet and return the smb length of the packet.
 684  Store the result in the buffer. This version of the function will
 685  never return a session keepalive (length of zero).
 686  Timeout is in milliseconds.
 687 ****************************************************************************/
 688
 689 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
 690                          size_t *len)
 691 {
 692         uint8_t msgtype = SMBkeepalive;
 693
 694         while (msgtype == SMBkeepalive) {
 695                 NTSTATUS status;
 696
 697                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
 698                                                           len);
 699                 if (!NT_STATUS_IS_OK(status)) {
 700                         return status;
 701                 }
 702
 703                 msgtype = CVAL(inbuf, 0);
 704         }
 705
 706         DEBUG(10,("read_smb_length: got smb length of %lu\n",
 707                   (unsigned long)len));
 708
 709         return NT_STATUS_OK;
 710 }
 711
 712 /****************************************************************************
 713  Read an smb from a fd.
 714  The timeout is in milliseconds.
 715  This function will return on receipt of a session keepalive packet.
 716  maxlen is the max number of bytes to return, not including the 4 byte
 717  length. If zero it means buflen limit.
 718  Doesn't check the MAC on signed packets.
 719 ****************************************************************************/
 720
 721 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 722                          size_t maxlen, size_t *p_len)
 723 {
 724         size_t len;
 725         NTSTATUS status;
 726
 727         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 728
 729         if (!NT_STATUS_IS_OK(status)) {
 730                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
 731                 return status;
 732         }
 733
 734         if (len > buflen) {
 735                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 736                                         (unsigned long)len));
 737                 return NT_STATUS_INVALID_PARAMETER;
 738         }
 739
 740         if(len > 0) {
 741                 if (maxlen) {
 742                         len = MIN(len,maxlen);
 743                 }
 744
 745                 status = read_fd_with_timeout(
 746                         fd, buffer+4, len, len, timeout, &len);
 747
 748                 if (!NT_STATUS_IS_OK(status)) {
 749                         if (fd == smbd_server_fd()) {
 750                                 char addr[INET6_ADDRSTRLEN];
 751                                 /* Try and give an error message
 752                                  * saying what client failed. */
 753                                 DEBUG(0, ("read_fd_with_timeout failed for "
 754                                           "client %s read error = %s.\n",
 755                                           get_peer_addr(fd,addr,sizeof(addr)),
 756                                           nt_errstr(status)));
 757                         } else {
 758                                 DEBUG(0, ("read_fd_with_timeout failed, "
 759                                           "read error = %s.\n",
 760                                           nt_errstr(status)));
 761                         }
 762                         return status;
 763                 }
 764
 765                 /* not all of samba3 properly checks for packet-termination
 766                  * of strings. This ensures that we don't run off into
 767                  * empty space. */
 768                 SSVAL(buffer+4,len, 0);
 769         }
 770
 771         *p_len = len;
 772         return NT_STATUS_OK;
 773 }
 774
 775 /****************************************************************************
 776  Open a socket of the specified type, port, and address for incoming data.
 777 ****************************************************************************/
 778
 779 int open_socket_in(int type,
 780                 uint16_t port,
 781                 int dlevel,
 782                 const struct sockaddr_storage *psock,
 783                 bool rebind)
 784 {
 785         struct sockaddr_storage sock;
 786         int res;
 787         socklen_t slen = sizeof(struct sockaddr_in);
 788
 789         sock = *psock;
 790
 791 #if defined(HAVE_IPV6)
 792         if (sock.ss_family == AF_INET6) {
 793                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 794                 slen = sizeof(struct sockaddr_in6);
 795         }
 796 #endif
 797         if (sock.ss_family == AF_INET) {
 798                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 799         }
 800
 801         res = socket(sock.ss_family, type, 0 );
 802         if( res == -1 ) {
 803                 if( DEBUGLVL(0) ) {
 804                         dbgtext( "open_socket_in(): socket() call failed: " );
 805                         dbgtext( "%s\n", strerror( errno ) );
 806                 }
 807                 return -1;
 808         }
 809
 810         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 811         {
 812                 int val = rebind ? 1 : 0;
 813                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 814                                         (char *)&val,sizeof(val)) == -1 ) {
 815                         if( DEBUGLVL( dlevel ) ) {
 816                                 dbgtext( "open_socket_in(): setsockopt: " );
 817                                 dbgtext( "SO_REUSEADDR = %s ",
 818                                                 val?"true":"false" );
 819                                 dbgtext( "on port %d failed ", port );
 820                                 dbgtext( "with error = %s\n", strerror(errno) );
 821                         }
 822                 }
 823 #ifdef SO_REUSEPORT
 824                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 825                                         (char *)&val,sizeof(val)) == -1 ) {
 826                         if( DEBUGLVL( dlevel ) ) {
 827                                 dbgtext( "open_socket_in(): setsockopt: ");
 828                                 dbgtext( "SO_REUSEPORT = %s ",
 829                                                 val?"true":"false");
 830                                 dbgtext( "on port %d failed ", port);
 831                                 dbgtext( "with error = %s\n", strerror(errno));
 832                         }
 833                 }
 834 #endif /* SO_REUSEPORT */
 835         }
 836
 837         /* now we've got a socket - we need to bind it */
 838         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 839                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 840                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 841                         char addr[INET6_ADDRSTRLEN];
 842                         print_sockaddr(addr, sizeof(addr),
 843                                         &sock);
 844                         dbgtext( "bind failed on port %d ", port);
 845                         dbgtext( "socket_addr = %s.\n", addr);
 846                         dbgtext( "Error = %s\n", strerror(errno));
 847                 }
 848                 close(res);
 849                 return -1;
 850         }
 851
 852         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 853         return( res );
 854  }
 855
 856 struct open_socket_out_state {
 857         int fd;
 858         struct event_context *ev;
 859         struct sockaddr_storage ss;
 860         socklen_t salen;
 861         uint16_t port;
 862         int wait_nsec;
 863 };
 864
 865 static void open_socket_out_connected(struct tevent_req *subreq);
 866
 867 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 868 {
 869         if (s->fd != -1) {
 870                 close(s->fd);
 871         }
 872         return 0;
 873 }
 874
 875 /****************************************************************************
 876  Create an outgoing socket. timeout is in milliseconds.
 877 **************************************************************************/
 878
 879 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 880                                         struct event_context *ev,
 881                                         const struct sockaddr_storage *pss,
 882                                         uint16_t port,
 883                                         int timeout)
 884 {
 885         char addr[INET6_ADDRSTRLEN];
 886         struct tevent_req *result, *subreq;
 887         struct open_socket_out_state *state;
 888         NTSTATUS status;
 889
 890         result = tevent_req_create(mem_ctx, &state,
 891                                    struct open_socket_out_state);
 892         if (result == NULL) {
 893                 return NULL;
 894         }
 895         state->ev = ev;
 896         state->ss = *pss;
 897         state->port = port;
 898         state->wait_nsec = 10000;
 899         state->salen = -1;
 900
 901         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 902         if (state->fd == -1) {
 903                 status = map_nt_error_from_unix(errno);
 904                 goto post_status;
 905         }
 906         talloc_set_destructor(state, open_socket_out_state_destructor);
 907
 908         if (!tevent_req_set_endtime(
 909                     result, ev, timeval_current_ofs(0, timeout*1000))) {
 910                 goto fail;
 911         }
 912
 913 #if defined(HAVE_IPV6)
 914         if (pss->ss_family == AF_INET6) {
 915                 struct sockaddr_in6 *psa6;
 916                 psa6 = (struct sockaddr_in6 *)&state->ss;
 917                 psa6->sin6_port = htons(port);
 918                 if (psa6->sin6_scope_id == 0
 919                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 920                         setup_linklocal_scope_id(
 921                                 (struct sockaddr *)&(state->ss));
 922                 }
 923                 state->salen = sizeof(struct sockaddr_in6);
 924         }
 925 #endif
 926         if (pss->ss_family == AF_INET) {
 927                 struct sockaddr_in *psa;
 928                 psa = (struct sockaddr_in *)&state->ss;
 929                 psa->sin_port = htons(port);
 930                 state->salen = sizeof(struct sockaddr_in);
 931         }
 932
 933         if (pss->ss_family == AF_UNIX) {
 934                 state->salen = sizeof(struct sockaddr_un);
 935         }
 936
 937         print_sockaddr(addr, sizeof(addr), &state->ss);
 938         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 939
 940         subreq = async_connect_send(state, state->ev, state->fd,
 941                                     (struct sockaddr *)&state->ss,
 942                                     state->salen);
 943         if ((subreq == NULL)
 944             || !tevent_req_set_endtime(
 945                     subreq, state->ev,
 946                     timeval_current_ofs(0, state->wait_nsec))) {
 947                 goto fail;
 948         }
 949         tevent_req_set_callback(subreq, open_socket_out_connected, result);
 950         return result;
 951
 952  post_status:
 953         tevent_req_nterror(result, status);
 954         return tevent_req_post(result, ev);
 955  fail:
 956         TALLOC_FREE(result);
 957         return NULL;
 958 }
 959
 960 static void open_socket_out_connected(struct tevent_req *subreq)
 961 {
 962         struct tevent_req *req =
 963                 tevent_req_callback_data(subreq, struct tevent_req);
 964         struct open_socket_out_state *state =
 965                 tevent_req_data(req, struct open_socket_out_state);
 966         int ret;
 967         int sys_errno;
 968
 969         ret = async_connect_recv(subreq, &sys_errno);
 970         TALLOC_FREE(subreq);
 971         if (ret == 0) {
 972                 tevent_req_done(req);
 973                 return;
 974         }
 975
 976         if (
 977 #ifdef ETIMEDOUT
 978                 (sys_errno == ETIMEDOUT) ||
 979 #endif
 980                 (sys_errno == EINPROGRESS) ||
 981                 (sys_errno == EALREADY) ||
 982                 (sys_errno == EAGAIN)) {
 983
 984                 /*
 985                  * retry
 986                  */
 987
 988                 if (state->wait_nsec < 250000) {
 989                         state->wait_nsec *= 1.5;
 990                 }
 991
 992                 subreq = async_connect_send(state, state->ev, state->fd,
 993                                             (struct sockaddr *)&state->ss,
 994                                             state->salen);
 995                 if (tevent_req_nomem(subreq, req)) {
 996                         return;
 997                 }
 998                 if (!tevent_req_set_endtime(
 999                             subreq, state->ev,
1000                             timeval_current_ofs(0, state->wait_nsec))) {
1001                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1002                         return;
1003                 }
1004                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1005                 return;
1006         }
1007
1008 #ifdef EISCONN
1009         if (sys_errno == EISCONN) {
1010                 tevent_req_done(req);
1011                 return;
1012         }
1013 #endif
1014
1015         /* real error */
1016         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1017 }
1018
1019 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1020 {
1021         struct open_socket_out_state *state =
1022                 tevent_req_data(req, struct open_socket_out_state);
1023         NTSTATUS status;
1024
1025         if (tevent_req_is_nterror(req, &status)) {
1026                 return status;
1027         }
1028         *pfd = state->fd;
1029         state->fd = -1;
1030         return NT_STATUS_OK;
1031 }
1032
1033 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1034                          int timeout, int *pfd)
1035 {
1036         TALLOC_CTX *frame = talloc_stackframe();
1037         struct event_context *ev;
1038         struct tevent_req *req;
1039         NTSTATUS status = NT_STATUS_NO_MEMORY;
1040
1041         ev = event_context_init(frame);
1042         if (ev == NULL) {
1043                 goto fail;
1044         }
1045
1046         req = open_socket_out_send(frame, ev, pss, port, timeout);
1047         if (req == NULL) {
1048                 goto fail;
1049         }
1050         if (!tevent_req_poll(req, ev)) {
1051                 status = NT_STATUS_INTERNAL_ERROR;
1052                 goto fail;
1053         }
1054         status = open_socket_out_recv(req, pfd);
1055  fail:
1056         TALLOC_FREE(frame);
1057         return status;
1058 }
1059
1060 struct open_socket_out_defer_state {
1061         struct event_context *ev;
1062         struct sockaddr_storage ss;
1063         uint16_t port;
1064         int timeout;
1065         int fd;
1066 };
1067
1068 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1069 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1070
1071 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1072                                               struct event_context *ev,
1073                                               struct timeval wait_time,
1074                                               const struct sockaddr_storage *pss,
1075                                               uint16_t port,
1076                                               int timeout)
1077 {
1078         struct tevent_req *req, *subreq;
1079         struct open_socket_out_defer_state *state;
1080
1081         req = tevent_req_create(mem_ctx, &state,
1082                                 struct open_socket_out_defer_state);
1083         if (req == NULL) {
1084                 return NULL;
1085         }
1086         state->ev = ev;
1087         state->ss = *pss;
1088         state->port = port;
1089         state->timeout = timeout;
1090
1091         subreq = tevent_wakeup_send(
1092                 state, ev,
1093                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1094         if (subreq == NULL) {
1095                 goto fail;
1096         }
1097         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1098         return req;
1099  fail:
1100         TALLOC_FREE(req);
1101         return NULL;
1102 }
1103
1104 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1105 {
1106         struct tevent_req *req = tevent_req_callback_data(
1107                 subreq, struct tevent_req);
1108         struct open_socket_out_defer_state *state = tevent_req_data(
1109                 req, struct open_socket_out_defer_state);
1110         bool ret;
1111
1112         ret = tevent_wakeup_recv(subreq);
1113         TALLOC_FREE(subreq);
1114         if (!ret) {
1115                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1116                 return;
1117         }
1118
1119         subreq = open_socket_out_send(state, state->ev, &state->ss,
1120                                       state->port, state->timeout);
1121         if (tevent_req_nomem(subreq, req)) {
1122                 return;
1123         }
1124         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1125 }
1126
1127 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1128 {
1129         struct tevent_req *req = tevent_req_callback_data(
1130                 subreq, struct tevent_req);
1131         struct open_socket_out_defer_state *state = tevent_req_data(
1132                 req, struct open_socket_out_defer_state);
1133         NTSTATUS status;
1134
1135         status = open_socket_out_recv(subreq, &state->fd);
1136         TALLOC_FREE(subreq);
1137         if (!NT_STATUS_IS_OK(status)) {
1138                 tevent_req_nterror(req, status);
1139                 return;
1140         }
1141         tevent_req_done(req);
1142 }
1143
1144 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1145 {
1146         struct open_socket_out_defer_state *state = tevent_req_data(
1147                 req, struct open_socket_out_defer_state);
1148         NTSTATUS status;
1149
1150         if (tevent_req_is_nterror(req, &status)) {
1151                 return status;
1152         }
1153         *pfd = state->fd;
1154         state->fd = -1;
1155         return NT_STATUS_OK;
1156 }
1157
1158 /*******************************************************************
1159  Create an outgoing TCP socket to the first addr that connects.
1160
1161  This is for simultaneous connection attempts to port 445 and 139 of a host
1162  or for simultatneous connection attempts to multiple DCs at once.  We return
1163  a socket fd of the first successful connection.
1164
1165  @param[in] addrs list of Internet addresses and ports to connect to
1166  @param[in] num_addrs number of address/port pairs in the addrs list
1167  @param[in] timeout time after which we stop waiting for a socket connection
1168             to succeed, given in milliseconds
1169  @param[out] fd_index the entry in addrs which we successfully connected to
1170  @param[out] fd fd of the open and connected socket
1171  @return true on a successful connection, false if all connection attempts
1172          failed or we timed out
1173 *******************************************************************/
1174
1175 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1176                          int timeout, int *fd_index, int *fd)
1177 {
1178         int i, resulting_index, res;
1179         int *sockets;
1180         bool good_connect;
1181
1182         fd_set r_fds, wr_fds;
1183         struct timeval tv;
1184         int maxfd;
1185
1186         int connect_loop = 10000; /* 10 milliseconds */
1187
1188         timeout *= 1000;        /* convert to microseconds */
1189
1190         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1191
1192         if (sockets == NULL)
1193                 return false;
1194
1195         resulting_index = -1;
1196
1197         for (i=0; i<num_addrs; i++)
1198                 sockets[i] = -1;
1199
1200         for (i=0; i<num_addrs; i++) {
1201                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1202                 if (sockets[i] < 0)
1203                         goto done;
1204                 set_blocking(sockets[i], false);
1205         }
1206
1207  connect_again:
1208         good_connect = false;
1209
1210         for (i=0; i<num_addrs; i++) {
1211                 const struct sockaddr * a =
1212                     (const struct sockaddr *)&(addrs[i]);
1213
1214                 if (sockets[i] == -1)
1215                         continue;
1216
1217                 if (sys_connect(sockets[i], a) == 0) {
1218                         /* Rather unlikely as we are non-blocking, but it
1219                          * might actually happen. */
1220                         resulting_index = i;
1221                         goto done;
1222                 }
1223
1224                 if (errno == EINPROGRESS || errno == EALREADY ||
1225 #ifdef EISCONN
1226                         errno == EISCONN ||
1227 #endif
1228                     errno == EAGAIN || errno == EINTR) {
1229                         /* These are the error messages that something is
1230                            progressing. */
1231                         good_connect = true;
1232                 } else if (errno != 0) {
1233                         /* There was a direct error */
1234                         close(sockets[i]);
1235                         sockets[i] = -1;
1236                 }
1237         }
1238
1239         if (!good_connect) {
1240                 /* All of the connect's resulted in real error conditions */
1241                 goto done;
1242         }
1243
1244         /* Lets see if any of the connect attempts succeeded */
1245
1246         maxfd = 0;
1247         FD_ZERO(&wr_fds);
1248         FD_ZERO(&r_fds);
1249
1250         for (i=0; i<num_addrs; i++) {
1251                 if (sockets[i] == -1)
1252                         continue;
1253                 FD_SET(sockets[i], &wr_fds);
1254                 FD_SET(sockets[i], &r_fds);
1255                 if (sockets[i]>maxfd)
1256                         maxfd = sockets[i];
1257         }
1258
1259         tv.tv_sec = 0;
1260         tv.tv_usec = connect_loop;
1261
1262         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1263
1264         if (res < 0)
1265                 goto done;
1266
1267         if (res == 0)
1268                 goto next_round;
1269
1270         for (i=0; i<num_addrs; i++) {
1271
1272                 if (sockets[i] == -1)
1273                         continue;
1274
1275                 /* Stevens, Network Programming says that if there's a
1276                  * successful connect, the socket is only writable. Upon an
1277                  * error, it's both readable and writable. */
1278
1279                 if (FD_ISSET(sockets[i], &r_fds) &&
1280                     FD_ISSET(sockets[i], &wr_fds)) {
1281                         /* readable and writable, so it's an error */
1282                         close(sockets[i]);
1283                         sockets[i] = -1;
1284                         continue;
1285                 }
1286
1287                 if (!FD_ISSET(sockets[i], &r_fds) &&
1288                     FD_ISSET(sockets[i], &wr_fds)) {
1289                         /* Only writable, so it's connected */
1290                         resulting_index = i;
1291                         goto done;
1292                 }
1293         }
1294
1295  next_round:
1296
1297         timeout -= connect_loop;
1298         if (timeout <= 0)
1299                 goto done;
1300         connect_loop *= 1.5;
1301         if (connect_loop > timeout)
1302                 connect_loop = timeout;
1303         goto connect_again;
1304
1305  done:
1306         for (i=0; i<num_addrs; i++) {
1307                 if (i == resulting_index)
1308                         continue;
1309                 if (sockets[i] >= 0)
1310                         close(sockets[i]);
1311         }
1312
1313         if (resulting_index >= 0) {
1314                 *fd_index = resulting_index;
1315                 *fd = sockets[*fd_index];
1316                 set_blocking(*fd, true);
1317         }
1318
1319         free(sockets);
1320
1321         return (resulting_index >= 0);
1322 }
1323 /****************************************************************************
1324  Open a connected UDP socket to host on port
1325 **************************************************************************/
1326
1327 int open_udp_socket(const char *host, int port)
1328 {
1329         struct sockaddr_storage ss;
1330         int res;
1331
1332         if (!interpret_string_addr(&ss, host, 0)) {
1333                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1334                         host));
1335                 return -1;
1336         }
1337
1338         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1339         if (res == -1) {
1340                 return -1;
1341         }
1342
1343 #if defined(HAVE_IPV6)
1344         if (ss.ss_family == AF_INET6) {
1345                 struct sockaddr_in6 *psa6;
1346                 psa6 = (struct sockaddr_in6 *)&ss;
1347                 psa6->sin6_port = htons(port);
1348                 if (psa6->sin6_scope_id == 0
1349                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1350                         setup_linklocal_scope_id(
1351                                 (struct sockaddr *)&ss);
1352                 }
1353         }
1354 #endif
1355         if (ss.ss_family == AF_INET) {
1356                 struct sockaddr_in *psa;
1357                 psa = (struct sockaddr_in *)&ss;
1358                 psa->sin_port = htons(port);
1359         }
1360
1361         if (sys_connect(res,(struct sockaddr *)&ss)) {
1362                 close(res);
1363                 return -1;
1364         }
1365
1366         return res;
1367 }
1368
1369 /*******************************************************************
1370  Return the IP addr of the remote end of a socket as a string.
1371  Optionally return the struct sockaddr_storage.
1372  ******************************************************************/
1373
1374 static const char *get_peer_addr_internal(int fd,
1375                                 char *addr_buf,
1376                                 size_t addr_buf_len,
1377                                 struct sockaddr *pss,
1378                                 socklen_t *plength)
1379 {
1380         struct sockaddr_storage ss;
1381         socklen_t length = sizeof(ss);
1382
1383         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1384
1385         if (fd == -1) {
1386                 return addr_buf;
1387         }
1388
1389         if (pss == NULL) {
1390                 pss = (struct sockaddr *)&ss;
1391                 plength = &length;
1392         }
1393
1394         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1395                 int level = (errno == ENOTCONN) ? 2 : 0;
1396                 DEBUG(level, ("getpeername failed. Error was %s\n",
1397                                strerror(errno)));
1398                 return addr_buf;
1399         }
1400
1401         print_sockaddr_len(addr_buf,
1402                         addr_buf_len,
1403                         pss,
1404                         *plength);
1405         return addr_buf;
1406 }
1407
1408 /*******************************************************************
1409  Matchname - determine if host name matches IP address. Used to
1410  confirm a hostname lookup to prevent spoof attacks.
1411 ******************************************************************/
1412
1413 static bool matchname(const char *remotehost,
1414                 const struct sockaddr *pss,
1415                 socklen_t len)
1416 {
1417         struct addrinfo *res = NULL;
1418         struct addrinfo *ailist = NULL;
1419         char addr_buf[INET6_ADDRSTRLEN];
1420         bool ret = interpret_string_addr_internal(&ailist,
1421                         remotehost,
1422                         AI_ADDRCONFIG|AI_CANONNAME);
1423
1424         if (!ret || ailist == NULL) {
1425                 DEBUG(3,("matchname: getaddrinfo failed for "
1426                         "name %s [%s]\n",
1427                         remotehost,
1428                         gai_strerror(ret) ));
1429                 return false;
1430         }
1431
1432         /*
1433          * Make sure that getaddrinfo() returns the "correct" host name.
1434          */
1435
1436         if (ailist->ai_canonname == NULL ||
1437                 (!strequal(remotehost, ailist->ai_canonname) &&
1438                  !strequal(remotehost, "localhost"))) {
1439                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1440                          remotehost,
1441                          ailist->ai_canonname ?
1442                                  ailist->ai_canonname : "(NULL)"));
1443                 freeaddrinfo(ailist);
1444                 return false;
1445         }
1446
1447         /* Look up the host address in the address list we just got. */
1448         for (res = ailist; res; res = res->ai_next) {
1449                 if (!res->ai_addr) {
1450                         continue;
1451                 }
1452                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1453                                         (struct sockaddr *)pss)) {
1454                         freeaddrinfo(ailist);
1455                         return true;
1456                 }
1457         }
1458
1459         /*
1460          * The host name does not map to the original host address. Perhaps
1461          * someone has compromised a name server. More likely someone botched
1462          * it, but that could be dangerous, too.
1463          */
1464
1465         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1466                 print_sockaddr_len(addr_buf,
1467                         sizeof(addr_buf),
1468                         pss,
1469                         len),
1470                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1471
1472         if (ailist) {
1473                 freeaddrinfo(ailist);
1474         }
1475         return false;
1476 }
1477
1478 /*******************************************************************
1479  Deal with the singleton cache.
1480 ******************************************************************/
1481
1482 struct name_addr_pair {
1483         struct sockaddr_storage ss;
1484         const char *name;
1485 };
1486
1487 /*******************************************************************
1488  Lookup a name/addr pair. Returns memory allocated from memcache.
1489 ******************************************************************/
1490
1491 static bool lookup_nc(struct name_addr_pair *nc)
1492 {
1493         DATA_BLOB tmp;
1494
1495         ZERO_STRUCTP(nc);
1496
1497         if (!memcache_lookup(
1498                         NULL, SINGLETON_CACHE,
1499                         data_blob_string_const_null("get_peer_name"),
1500                         &tmp)) {
1501                 return false;
1502         }
1503
1504         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1505         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1506         return true;
1507 }
1508
1509 /*******************************************************************
1510  Save a name/addr pair.
1511 ******************************************************************/
1512
1513 static void store_nc(const struct name_addr_pair *nc)
1514 {
1515         DATA_BLOB tmp;
1516         size_t namelen = strlen(nc->name);
1517
1518         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1519         if (!tmp.data) {
1520                 return;
1521         }
1522         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1523         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1524
1525         memcache_add(NULL, SINGLETON_CACHE,
1526                         data_blob_string_const_null("get_peer_name"),
1527                         tmp);
1528         data_blob_free(&tmp);
1529 }
1530
1531 /*******************************************************************
1532  Return the DNS name of the remote end of a socket.
1533 ******************************************************************/
1534
1535 const char *get_peer_name(int fd, bool force_lookup)
1536 {
1537         struct name_addr_pair nc;
1538         char addr_buf[INET6_ADDRSTRLEN];
1539         struct sockaddr_storage ss;
1540         socklen_t length = sizeof(ss);
1541         const char *p;
1542         int ret;
1543         char name_buf[MAX_DNS_NAME_LENGTH];
1544         char tmp_name[MAX_DNS_NAME_LENGTH];
1545
1546         /* reverse lookups can be *very* expensive, and in many
1547            situations won't work because many networks don't link dhcp
1548            with dns. To avoid the delay we avoid the lookup if
1549            possible */
1550         if (!lp_hostname_lookups() && (force_lookup == false)) {
1551                 length = sizeof(nc.ss);
1552                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1553                         (struct sockaddr *)&nc.ss, &length);
1554                 store_nc(&nc);
1555                 lookup_nc(&nc);
1556                 return nc.name ? nc.name : "UNKNOWN";
1557         }
1558
1559         lookup_nc(&nc);
1560
1561         memset(&ss, '\0', sizeof(ss));
1562         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1563
1564         /* it might be the same as the last one - save some DNS work */
1565         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1566                 return nc.name ? nc.name : "UNKNOWN";
1567         }
1568
1569         /* Not the same. We need to lookup. */
1570         if (fd == -1) {
1571                 return "UNKNOWN";
1572         }
1573
1574         /* Look up the remote host name. */
1575         ret = sys_getnameinfo((struct sockaddr *)&ss,
1576                         length,
1577                         name_buf,
1578                         sizeof(name_buf),
1579                         NULL,
1580                         0,
1581                         0);
1582
1583         if (ret) {
1584                 DEBUG(1,("get_peer_name: getnameinfo failed "
1585                         "for %s with error %s\n",
1586                         p,
1587                         gai_strerror(ret)));
1588                 strlcpy(name_buf, p, sizeof(name_buf));
1589         } else {
1590                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1591                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1592                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1593                 }
1594         }
1595
1596         /* can't pass the same source and dest strings in when you
1597            use --enable-developer or the clobber_region() call will
1598            get you */
1599
1600         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1601         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1602         if (strstr(name_buf,"..")) {
1603                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1604         }
1605
1606         nc.name = name_buf;
1607         nc.ss = ss;
1608
1609         store_nc(&nc);
1610         lookup_nc(&nc);
1611         return nc.name ? nc.name : "UNKNOWN";
1612 }
1613
1614 /*******************************************************************
1615  Return the IP addr of the remote end of a socket as a string.
1616  ******************************************************************/
1617
1618 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1619 {
1620         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1621 }
1622
1623 /*******************************************************************
1624  Create protected unix domain socket.
1625
1626  Some unixes cannot set permissions on a ux-dom-sock, so we
1627  have to make sure that the directory contains the protection
1628  permissions instead.
1629  ******************************************************************/
1630
1631 int create_pipe_sock(const char *socket_dir,
1632                      const char *socket_name,
1633                      mode_t dir_perms)
1634 {
1635 #ifdef HAVE_UNIXSOCKET
1636         struct sockaddr_un sunaddr;
1637         struct stat st;
1638         int sock;
1639         mode_t old_umask;
1640         char *path = NULL;
1641
1642         old_umask = umask(0);
1643
1644         /* Create the socket directory or reuse the existing one */
1645
1646         if (lstat(socket_dir, &st) == -1) {
1647                 if (errno == ENOENT) {
1648                         /* Create directory */
1649                         if (mkdir(socket_dir, dir_perms) == -1) {
1650                                 DEBUG(0, ("error creating socket directory "
1651                                         "%s: %s\n", socket_dir,
1652                                         strerror(errno)));
1653                                 goto out_umask;
1654                         }
1655                 } else {
1656                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1657                                 socket_dir, strerror(errno)));
1658                         goto out_umask;
1659                 }
1660         } else {
1661                 /* Check ownership and permission on existing directory */
1662                 if (!S_ISDIR(st.st_mode)) {
1663                         DEBUG(0, ("socket directory %s isn't a directory\n",
1664                                 socket_dir));
1665                         goto out_umask;
1666                 }
1667                 if ((st.st_uid != sec_initial_uid()) ||
1668                                 ((st.st_mode & 0777) != dir_perms)) {
1669                         DEBUG(0, ("invalid permissions on socket directory "
1670                                 "%s\n", socket_dir));
1671                         goto out_umask;
1672                 }
1673         }
1674
1675         /* Create the socket file */
1676
1677         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1678
1679         if (sock == -1) {
1680                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1681                         strerror(errno) ));
1682                 goto out_close;
1683         }
1684
1685         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1686                 goto out_close;
1687         }
1688
1689         unlink(path);
1690         memset(&sunaddr, 0, sizeof(sunaddr));
1691         sunaddr.sun_family = AF_UNIX;
1692         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1693
1694         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1695                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1696                         strerror(errno)));
1697                 goto out_close;
1698         }
1699
1700         if (listen(sock, 5) == -1) {
1701                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1702                         strerror(errno)));
1703                 goto out_close;
1704         }
1705
1706         SAFE_FREE(path);
1707
1708         umask(old_umask);
1709         return sock;
1710
1711 out_close:
1712         SAFE_FREE(path);
1713         if (sock != -1)
1714                 close(sock);
1715
1716 out_umask:
1717         umask(old_umask);
1718         return -1;
1719
1720 #else
1721         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1722         return -1;
1723 #endif /* HAVE_UNIXSOCKET */
1724 }
1725
1726 /****************************************************************************
1727  Get my own canonical name, including domain.
1728 ****************************************************************************/
1729
1730 const char *get_mydnsfullname(void)
1731 {
1732         struct addrinfo *res = NULL;
1733         char my_hostname[HOST_NAME_MAX];
1734         bool ret;
1735         DATA_BLOB tmp;
1736
1737         if (memcache_lookup(NULL, SINGLETON_CACHE,
1738                         data_blob_string_const_null("get_mydnsfullname"),
1739                         &tmp)) {
1740                 SMB_ASSERT(tmp.length > 0);
1741                 return (const char *)tmp.data;
1742         }
1743
1744         /* get my host name */
1745         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1746                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1747                 return NULL;
1748         }
1749
1750         /* Ensure null termination. */
1751         my_hostname[sizeof(my_hostname)-1] = '\0';
1752
1753         ret = interpret_string_addr_internal(&res,
1754                                 my_hostname,
1755                                 AI_ADDRCONFIG|AI_CANONNAME);
1756
1757         if (!ret || res == NULL) {
1758                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1759                         "name %s [%s]\n",
1760                         my_hostname,
1761                         gai_strerror(ret) ));
1762                 return NULL;
1763         }
1764
1765         /*
1766          * Make sure that getaddrinfo() returns the "correct" host name.
1767          */
1768
1769         if (res->ai_canonname == NULL) {
1770                 DEBUG(3,("get_mydnsfullname: failed to get "
1771                         "canonical name for %s\n",
1772                         my_hostname));
1773                 freeaddrinfo(res);
1774                 return NULL;
1775         }
1776
1777         /* This copies the data, so we must do a lookup
1778          * afterwards to find the value to return.
1779          */
1780
1781         memcache_add(NULL, SINGLETON_CACHE,
1782                         data_blob_string_const_null("get_mydnsfullname"),
1783                         data_blob_string_const_null(res->ai_canonname));
1784
1785         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1786                         data_blob_string_const_null("get_mydnsfullname"),
1787                         &tmp)) {
1788                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1789                                 strlen(res->ai_canonname) + 1);
1790         }
1791
1792         freeaddrinfo(res);
1793
1794         return (const char *)tmp.data;
1795 }
1796
1797 /************************************************************
1798  Is this my name ?
1799 ************************************************************/
1800
1801 bool is_myname_or_ipaddr(const char *s)
1802 {
1803         TALLOC_CTX *ctx = talloc_tos();
1804         char addr[INET6_ADDRSTRLEN];
1805         char *name = NULL;
1806         const char *dnsname;
1807         char *servername = NULL;
1808
1809         if (!s) {
1810                 return false;
1811         }
1812
1813         /* Santize the string from '\\name' */
1814         name = talloc_strdup(ctx, s);
1815         if (!name) {
1816                 return false;
1817         }
1818
1819         servername = strrchr_m(name, '\\' );
1820         if (!servername) {
1821                 servername = name;
1822         } else {
1823                 servername++;
1824         }
1825
1826         /* Optimize for the common case */
1827         if (strequal(servername, global_myname())) {
1828                 return true;
1829         }
1830
1831         /* Check for an alias */
1832         if (is_myname(servername)) {
1833                 return true;
1834         }
1835
1836         /* Check for loopback */
1837         if (strequal(servername, "127.0.0.1") ||
1838                         strequal(servername, "::1")) {
1839                 return true;
1840         }
1841
1842         if (strequal(servername, "localhost")) {
1843                 return true;
1844         }
1845
1846         /* Maybe it's my dns name */
1847         dnsname = get_mydnsfullname();
1848         if (dnsname && strequal(servername, dnsname)) {
1849                 return true;
1850         }
1851
1852         /* Handle possible CNAME records - convert to an IP addr. */
1853         if (!is_ipaddress(servername)) {
1854                 /* Use DNS to resolve the name, but only the first address */
1855                 struct sockaddr_storage ss;
1856                 if (interpret_string_addr(&ss, servername, 0)) {
1857                         print_sockaddr(addr,
1858                                         sizeof(addr),
1859                                         &ss);
1860                         servername = addr;
1861                 }
1862         }
1863
1864         /* Maybe its an IP address? */
1865         if (is_ipaddress(servername)) {
1866                 struct sockaddr_storage ss;
1867                 struct iface_struct *nics;
1868                 int i, n;
1869
1870                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1871                         return false;
1872                 }
1873
1874                 if (ismyaddr((struct sockaddr *)&ss)) {
1875                         return true;
1876                 }
1877
1878                 if (is_zero_addr((struct sockaddr *)&ss) ||
1879                         is_loopback_addr((struct sockaddr *)&ss)) {
1880                         return false;
1881                 }
1882
1883                 n = get_interfaces(talloc_tos(), &nics);
1884                 for (i=0; i<n; i++) {
1885                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1886                                 TALLOC_FREE(nics);
1887                                 return true;
1888                         }
1889                 }
1890                 TALLOC_FREE(nics);
1891         }
1892
1893         /* No match */
1894         return false;
1895 }
1896
1897 struct getaddrinfo_state {
1898         const char *node;
1899         const char *service;
1900         const struct addrinfo *hints;
1901         struct addrinfo *res;
1902         int ret;
1903 };
1904
1905 static void getaddrinfo_do(void *private_data);
1906 static void getaddrinfo_done(struct tevent_req *subreq);
1907
1908 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1909                                     struct tevent_context *ev,
1910                                     struct fncall_context *ctx,
1911                                     const char *node,
1912                                     const char *service,
1913                                     const struct addrinfo *hints)
1914 {
1915         struct tevent_req *req, *subreq;
1916         struct getaddrinfo_state *state;
1917
1918         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1919         if (req == NULL) {
1920                 return NULL;
1921         }
1922
1923         state->node = node;
1924         state->service = service;
1925         state->hints = hints;
1926
1927         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1928         if (tevent_req_nomem(subreq, req)) {
1929                 return tevent_req_post(req, ev);
1930         }
1931         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1932         return req;
1933 }
1934
1935 static void getaddrinfo_do(void *private_data)
1936 {
1937         struct getaddrinfo_state *state =
1938                 (struct getaddrinfo_state *)private_data;
1939
1940         state->ret = getaddrinfo(state->node, state->service, state->hints,
1941                                  &state->res);
1942 }
1943
1944 static void getaddrinfo_done(struct tevent_req *subreq)
1945 {
1946         struct tevent_req *req = tevent_req_callback_data(
1947                 subreq, struct tevent_req);
1948         int ret, err;
1949
1950         ret = fncall_recv(subreq, &err);
1951         TALLOC_FREE(subreq);
1952         if (ret == -1) {
1953                 tevent_req_error(req, err);
1954                 return;
1955         }
1956         tevent_req_done(req);
1957 }
1958
1959 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1960 {
1961         struct getaddrinfo_state *state = tevent_req_data(
1962                 req, struct getaddrinfo_state);
1963         int err;
1964
1965         if (tevent_req_is_unix_error(req, &err)) {
1966                 switch(err) {
1967                 case ENOMEM:
1968                         return EAI_MEMORY;
1969                 default:
1970                         return EAI_FAIL;
1971                 }
1972         }
1973         if (state->ret == 0) {
1974                 *res = state->res;
1975         }
1976         return state->ret;
1977 }