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  Map a text hostname or IP address (IPv4 or IPv6) into a
  26  struct sockaddr_storage.
  27 ******************************************************************/
  28
  29 bool interpret_string_addr(struct sockaddr_storage *pss,
  30                 const char *str,
  31                 int flags)
  32 {
  33         struct addrinfo *res = NULL;
  34 #if defined(HAVE_IPV6)
  35         char addr[INET6_ADDRSTRLEN];
  36         unsigned int scope_id = 0;
  37
  38         if (strchr_m(str, ':')) {
  39                 char *p = strchr_m(str, '%');
  40
  41                 /*
  42                  * Cope with link-local.
  43                  * This is IP:v6:addr%ifname.
  44                  */
  45
  46                 if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
  47                         strlcpy(addr, str,
  48                                 MIN(PTR_DIFF(p,str)+1,
  49                                         sizeof(addr)));
  50                         str = addr;
  51                 }
  52         }
  53 #endif
  54
  55         zero_sockaddr(pss);
  56
  57         if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
  58                 return false;
  59         }
  60         if (!res) {
  61                 return false;
  62         }
  63         /* Copy the first sockaddr. */
  64         memcpy(pss, res->ai_addr, res->ai_addrlen);
  65
  66 #if defined(HAVE_IPV6)
  67         if (pss->ss_family == AF_INET6 && scope_id) {
  68                 struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
  69                 if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
  70                                 ps6->sin6_scope_id == 0) {
  71                         ps6->sin6_scope_id = scope_id;
  72                 }
  73         }
  74 #endif
  75
  76         freeaddrinfo(res);
  77         return true;
  78 }
  79
  80 /*******************************************************************
  81  Set an address to INADDR_ANY.
  82 ******************************************************************/
  83
  84 void zero_sockaddr(struct sockaddr_storage *pss)
  85 {
  86         memset(pss, '\0', sizeof(*pss));
  87         /* Ensure we're at least a valid sockaddr-storage. */
  88         pss->ss_family = AF_INET;
  89 }
  90
  91 /****************************************************************************
  92  Get a port number in host byte order from a sockaddr_storage.
  93 ****************************************************************************/
  94
  95 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
  96 {
  97         uint16_t port = 0;
  98
  99         if (pss->ss_family != AF_INET) {
 100 #if defined(HAVE_IPV6)
 101                 /* IPv6 */
 102                 const struct sockaddr_in6 *sa6 =
 103                         (const struct sockaddr_in6 *)pss;
 104                 port = ntohs(sa6->sin6_port);
 105 #endif
 106         } else {
 107                 const struct sockaddr_in *sa =
 108                         (const struct sockaddr_in *)pss;
 109                 port = ntohs(sa->sin_port);
 110         }
 111         return port;
 112 }
 113
 114 /****************************************************************************
 115  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
 116 ****************************************************************************/
 117
 118 static char *print_sockaddr_len(char *dest,
 119                         size_t destlen,
 120                         const struct sockaddr *psa,
 121                         socklen_t psalen)
 122 {
 123         if (destlen > 0) {
 124                 dest[0] = '\0';
 125         }
 126         (void)sys_getnameinfo(psa,
 127                         psalen,
 128                         dest, destlen,
 129                         NULL, 0,
 130                         NI_NUMERICHOST);
 131         return dest;
 132 }
 133
 134 /****************************************************************************
 135  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
 136 ****************************************************************************/
 137
 138 char *print_sockaddr(char *dest,
 139                         size_t destlen,
 140                         const struct sockaddr_storage *psa)
 141 {
 142         return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
 143                         sizeof(struct sockaddr_storage));
 144 }
 145
 146 /****************************************************************************
 147  Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
 148 ****************************************************************************/
 149
 150 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
 151                         const struct sockaddr_storage *pss)
 152 {
 153         char addr[INET6_ADDRSTRLEN];
 154         char *dest = NULL;
 155         int ret;
 156
 157         /* Linux getnameinfo() man pages says port is unitialized if
 158            service name is NULL. */
 159
 160         ret = sys_getnameinfo((const struct sockaddr *)pss,
 161                         sizeof(struct sockaddr_storage),
 162                         addr, sizeof(addr),
 163                         NULL, 0,
 164                         NI_NUMERICHOST);
 165         if (ret != 0) {
 166                 return NULL;
 167         }
 168
 169         if (pss->ss_family != AF_INET) {
 170 #if defined(HAVE_IPV6)
 171                 dest = talloc_asprintf(ctx, "[%s]", addr);
 172 #else
 173                 return NULL;
 174 #endif
 175         } else {
 176                 dest = talloc_asprintf(ctx, "%s", addr);
 177         }
 178
 179         return dest;
 180 }
 181
 182 /****************************************************************************
 183  Return the string of an IP address (IPv4 or IPv6).
 184 ****************************************************************************/
 185
 186 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
 187 {
 188         struct sockaddr_storage sa;
 189         socklen_t length = sizeof(sa);
 190
 191         /* Ok, returning a hard coded IPv4 address
 192          * is bogus, but it's just as bogus as a
 193          * zero IPv6 address. No good choice here.
 194          */
 195
 196         strlcpy(addr_buf, "0.0.0.0", addr_len);
 197
 198         if (fd == -1) {
 199                 return addr_buf;
 200         }
 201
 202         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 203                 DEBUG(0,("getsockname failed. Error was %s\n",
 204                         strerror(errno) ));
 205                 return addr_buf;
 206         }
 207
 208         return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
 209 }
 210
 211 #if 0
 212 /* Not currently used. JRA. */
 213 /****************************************************************************
 214  Return the port number we've bound to on a socket.
 215 ****************************************************************************/
 216
 217 static int get_socket_port(int fd)
 218 {
 219         struct sockaddr_storage sa;
 220         socklen_t length = sizeof(sa);
 221
 222         if (fd == -1) {
 223                 return -1;
 224         }
 225
 226         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 227                 DEBUG(0,("getpeername failed. Error was %s\n",
 228                         strerror(errno) ));
 229                 return -1;
 230         }
 231
 232 #if defined(HAVE_IPV6)
 233         if (sa.ss_family == AF_INET6) {
 234                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
 235         }
 236 #endif
 237         if (sa.ss_family == AF_INET) {
 238                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
 239         }
 240         return -1;
 241 }
 242 #endif
 243
 244 const char *client_name(int fd)
 245 {
 246         return get_peer_name(fd,false);
 247 }
 248
 249 const char *client_addr(int fd, char *addr, size_t addrlen)
 250 {
 251         return get_peer_addr(fd,addr,addrlen);
 252 }
 253
 254 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
 255 {
 256         return get_socket_addr(fd, addr, addr_len);
 257 }
 258
 259 #if 0
 260 /* Not currently used. JRA. */
 261 int client_socket_port(int fd)
 262 {
 263         return get_socket_port(fd);
 264 }
 265 #endif
 266
 267 /****************************************************************************
 268  Accessor functions to make thread-safe code easier later...
 269 ****************************************************************************/
 270
 271 void set_smb_read_error(enum smb_read_errors *pre,
 272                         enum smb_read_errors newerr)
 273 {
 274         if (pre) {
 275                 *pre = newerr;
 276         }
 277 }
 278
 279 void cond_set_smb_read_error(enum smb_read_errors *pre,
 280                         enum smb_read_errors newerr)
 281 {
 282         if (pre && *pre == SMB_READ_OK) {
 283                 *pre = newerr;
 284         }
 285 }
 286
 287 /****************************************************************************
 288  Determine if a file descriptor is in fact a socket.
 289 ****************************************************************************/
 290
 291 bool is_a_socket(int fd)
 292 {
 293         int v;
 294         socklen_t l;
 295         l = sizeof(int);
 296         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
 297 }
 298
 299 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
 300
 301 typedef struct smb_socket_option {
 302         const char *name;
 303         int level;
 304         int option;
 305         int value;
 306         int opttype;
 307 } smb_socket_option;
 308
 309 static const smb_socket_option socket_options[] = {
 310   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
 311   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
 312   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
 313 #ifdef TCP_NODELAY
 314   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
 315 #endif
 316 #ifdef TCP_KEEPCNT
 317   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
 318 #endif
 319 #ifdef TCP_KEEPIDLE
 320   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
 321 #endif
 322 #ifdef TCP_KEEPINTVL
 323   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
 324 #endif
 325 #ifdef IPTOS_LOWDELAY
 326   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
 327 #endif
 328 #ifdef IPTOS_THROUGHPUT
 329   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
 330 #endif
 331 #ifdef SO_REUSEPORT
 332   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
 333 #endif
 334 #ifdef SO_SNDBUF
 335   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
 336 #endif
 337 #ifdef SO_RCVBUF
 338   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
 339 #endif
 340 #ifdef SO_SNDLOWAT
 341   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
 342 #endif
 343 #ifdef SO_RCVLOWAT
 344   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
 345 #endif
 346 #ifdef SO_SNDTIMEO
 347   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
 348 #endif
 349 #ifdef SO_RCVTIMEO
 350   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
 351 #endif
 352 #ifdef TCP_FASTACK
 353   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
 354 #endif
 355   {NULL,0,0,0,0}};
 356
 357 /****************************************************************************
 358  Print socket options.
 359 ****************************************************************************/
 360
 361 static void print_socket_options(int s)
 362 {
 363         int value;
 364         socklen_t vlen = 4;
 365         const smb_socket_option *p = &socket_options[0];
 366
 367         /* wrapped in if statement to prevent streams
 368          * leak in SCO Openserver 5.0 */
 369         /* reported on samba-technical  --jerry */
 370         if ( DEBUGLEVEL >= 5 ) {
 371                 DEBUG(5,("Socket options:\n"));
 372                 for (; p->name != NULL; p++) {
 373                         if (getsockopt(s, p->level, p->option,
 374                                                 (void *)&value, &vlen) == -1) {
 375                                 DEBUGADD(5,("\tCould not test socket option %s.\n",
 376                                                         p->name));
 377                         } else {
 378                                 DEBUGADD(5,("\t%s = %d\n",
 379                                                         p->name,value));
 380                         }
 381                 }
 382         }
 383  }
 384
 385 /****************************************************************************
 386  Set user socket options.
 387 ****************************************************************************/
 388
 389 void set_socket_options(int fd, const char *options)
 390 {
 391         TALLOC_CTX *ctx = talloc_stackframe();
 392         char *tok;
 393
 394         while (next_token_talloc(ctx, &options, &tok," \t,")) {
 395                 int ret=0,i;
 396                 int value = 1;
 397                 char *p;
 398                 bool got_value = false;
 399
 400                 if ((p = strchr_m(tok,'='))) {
 401                         *p = 0;
 402                         value = atoi(p+1);
 403                         got_value = true;
 404                 }
 405
 406                 for (i=0;socket_options[i].name;i++)
 407                         if (strequal(socket_options[i].name,tok))
 408                                 break;
 409
 410                 if (!socket_options[i].name) {
 411                         DEBUG(0,("Unknown socket option %s\n",tok));
 412                         continue;
 413                 }
 414
 415                 switch (socket_options[i].opttype) {
 416                 case OPT_BOOL:
 417                 case OPT_INT:
 418                         ret = setsockopt(fd,socket_options[i].level,
 419                                         socket_options[i].option,
 420                                         (char *)&value,sizeof(int));
 421                         break;
 422
 423                 case OPT_ON:
 424                         if (got_value)
 425                                 DEBUG(0,("syntax error - %s "
 426                                         "does not take a value\n",tok));
 427
 428                         {
 429                                 int on = socket_options[i].value;
 430                                 ret = setsockopt(fd,socket_options[i].level,
 431                                         socket_options[i].option,
 432                                         (char *)&on,sizeof(int));
 433                         }
 434                         break;
 435                 }
 436
 437                 if (ret != 0) {
 438                         /* be aware that some systems like Solaris return
 439                          * EINVAL to a setsockopt() call when the client
 440                          * sent a RST previously - no need to worry */
 441                         DEBUG(2,("Failed to set socket option %s (Error %s)\n",
 442                                 tok, strerror(errno) ));
 443                 }
 444         }
 445
 446         TALLOC_FREE(ctx);
 447         print_socket_options(fd);
 448 }
 449
 450 /****************************************************************************
 451  Read from a socket.
 452 ****************************************************************************/
 453
 454 ssize_t read_udp_v4_socket(int fd,
 455                         char *buf,
 456                         size_t len,
 457                         struct sockaddr_storage *psa)
 458 {
 459         ssize_t ret;
 460         socklen_t socklen = sizeof(*psa);
 461         struct sockaddr_in *si = (struct sockaddr_in *)psa;
 462
 463         memset((char *)psa,'\0',socklen);
 464
 465         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
 466                         (struct sockaddr *)psa,&socklen);
 467         if (ret <= 0) {
 468                 /* Don't print a low debug error for a non-blocking socket. */
 469                 if (errno == EAGAIN) {
 470                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 471                 } else {
 472                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 473                                 strerror(errno)));
 474                 }
 475                 return 0;
 476         }
 477
 478         if (psa->ss_family != AF_INET) {
 479                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 480                         "(not IPv4)\n", (int)psa->ss_family));
 481                 return 0;
 482         }
 483
 484         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 485                         inet_ntoa(si->sin_addr),
 486                         si->sin_port,
 487                         (unsigned long)ret));
 488
 489         return ret;
 490 }
 491
 492 /****************************************************************************
 493  Read data from a socket with a timout in msec.
 494  mincount = if timeout, minimum to read before returning
 495  maxcount = number to be read.
 496  time_out = timeout in milliseconds
 497 ****************************************************************************/
 498
 499 NTSTATUS read_socket_with_timeout(int fd, char *buf,
 500                                   size_t mincnt, size_t maxcnt,
 501                                   unsigned int time_out,
 502                                   size_t *size_ret)
 503 {
 504         fd_set fds;
 505         int selrtn;
 506         ssize_t readret;
 507         size_t nread = 0;
 508         struct timeval timeout;
 509         char addr[INET6_ADDRSTRLEN];
 510
 511         /* just checking .... */
 512         if (maxcnt <= 0)
 513                 return NT_STATUS_OK;
 514
 515         /* Blocking read */
 516         if (time_out == 0) {
 517                 if (mincnt == 0) {
 518                         mincnt = maxcnt;
 519                 }
 520
 521                 while (nread < mincnt) {
 522                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 523
 524                         if (readret == 0) {
 525                                 DEBUG(5,("read_socket_with_timeout: "
 526                                         "blocking read. EOF from client.\n"));
 527                                 return NT_STATUS_END_OF_FILE;
 528                         }
 529
 530                         if (readret == -1) {
 531                                 if (fd == get_client_fd()) {
 532                                         /* Try and give an error message
 533                                          * saying what client failed. */
 534                                         DEBUG(0,("read_socket_with_timeout: "
 535                                                 "client %s read error = %s.\n",
 536                                                 get_peer_addr(fd,addr,sizeof(addr)),
 537                                                 strerror(errno) ));
 538                                 } else {
 539                                         DEBUG(0,("read_socket_with_timeout: "
 540                                                 "read error = %s.\n",
 541                                                 strerror(errno) ));
 542                                 }
 543                                 return map_nt_error_from_unix(errno);
 544                         }
 545                         nread += readret;
 546                 }
 547                 goto done;
 548         }
 549
 550         /* Most difficult - timeout read */
 551         /* If this is ever called on a disk file and
 552            mincnt is greater then the filesize then
 553            system performance will suffer severely as
 554            select always returns true on disk files */
 555
 556         /* Set initial timeout */
 557         timeout.tv_sec = (time_t)(time_out / 1000);
 558         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 559
 560         for (nread=0; nread < mincnt; ) {
 561                 FD_ZERO(&fds);
 562                 FD_SET(fd,&fds);
 563
 564                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 565
 566                 /* Check if error */
 567                 if (selrtn == -1) {
 568                         /* something is wrong. Maybe the socket is dead? */
 569                         if (fd == get_client_fd()) {
 570                                 /* Try and give an error message saying
 571                                  * what client failed. */
 572                                 DEBUG(0,("read_socket_with_timeout: timeout "
 573                                 "read for client %s. select error = %s.\n",
 574                                 get_peer_addr(fd,addr,sizeof(addr)),
 575                                 strerror(errno) ));
 576                         } else {
 577                                 DEBUG(0,("read_socket_with_timeout: timeout "
 578                                 "read. select error = %s.\n",
 579                                 strerror(errno) ));
 580                         }
 581                         return map_nt_error_from_unix(errno);
 582                 }
 583
 584                 /* Did we timeout ? */
 585                 if (selrtn == 0) {
 586                         DEBUG(10,("read_socket_with_timeout: timeout read. "
 587                                 "select timed out.\n"));
 588                         return NT_STATUS_IO_TIMEOUT;
 589                 }
 590
 591                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 592
 593                 if (readret == 0) {
 594                         /* we got EOF on the file descriptor */
 595                         DEBUG(5,("read_socket_with_timeout: timeout read. "
 596                                 "EOF from client.\n"));
 597                         return NT_STATUS_END_OF_FILE;
 598                 }
 599
 600                 if (readret == -1) {
 601                         /* the descriptor is probably dead */
 602                         if (fd == get_client_fd()) {
 603                                 /* Try and give an error message
 604                                  * saying what client failed. */
 605                                 DEBUG(0,("read_socket_with_timeout: timeout "
 606                                         "read to client %s. read error = %s.\n",
 607                                         get_peer_addr(fd,addr,sizeof(addr)),
 608                                         strerror(errno) ));
 609                         } else {
 610                                 DEBUG(0,("read_socket_with_timeout: timeout "
 611                                         "read. read error = %s.\n",
 612                                         strerror(errno) ));
 613                         }
 614                         return map_nt_error_from_unix(errno);
 615                 }
 616
 617                 nread += readret;
 618         }
 619
 620  done:
 621         /* Return the number we got */
 622         if (size_ret) {
 623                 *size_ret = nread;
 624         }
 625         return NT_STATUS_OK;
 626 }
 627
 628 /****************************************************************************
 629  Read data from the client, reading exactly N bytes.
 630 ****************************************************************************/
 631
 632 NTSTATUS read_data(int fd, char *buffer, size_t N)
 633 {
 634         return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
 635 }
 636
 637 /****************************************************************************
 638  Write all data from an iov array
 639 ****************************************************************************/
 640
 641 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 642 {
 643         int i;
 644         size_t to_send;
 645         ssize_t thistime;
 646         size_t sent;
 647         struct iovec *iov_copy, *iov;
 648
 649         to_send = 0;
 650         for (i=0; i<iovcnt; i++) {
 651                 to_send += orig_iov[i].iov_len;
 652         }
 653
 654         thistime = sys_writev(fd, orig_iov, iovcnt);
 655         if ((thistime <= 0) || (thistime == to_send)) {
 656                 return thistime;
 657         }
 658         sent = thistime;
 659
 660         /*
 661          * We could not send everything in one call. Make a copy of iov that
 662          * we can mess with. We keep a copy of the array start in iov_copy for
 663          * the TALLOC_FREE, because we're going to modify iov later on,
 664          * discarding elements.
 665          */
 666
 667         iov_copy = (struct iovec *)TALLOC_MEMDUP(
 668                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 669
 670         if (iov_copy == NULL) {
 671                 errno = ENOMEM;
 672                 return -1;
 673         }
 674         iov = iov_copy;
 675
 676         while (sent < to_send) {
 677                 /*
 678                  * We have to discard "thistime" bytes from the beginning
 679                  * iov array, "thistime" contains the number of bytes sent
 680                  * via writev last.
 681                  */
 682                 while (thistime > 0) {
 683                         if (thistime < iov[0].iov_len) {
 684                                 char *new_base =
 685                                         (char *)iov[0].iov_base + thistime;
 686                                 iov[0].iov_base = new_base;
 687                                 iov[0].iov_len -= thistime;
 688                                 break;
 689                         }
 690                         thistime -= iov[0].iov_len;
 691                         iov += 1;
 692                         iovcnt -= 1;
 693                 }
 694
 695                 thistime = sys_writev(fd, iov, iovcnt);
 696                 if (thistime <= 0) {
 697                         break;
 698                 }
 699                 sent += thistime;
 700         }
 701
 702         TALLOC_FREE(iov_copy);
 703         return sent;
 704 }
 705
 706 /****************************************************************************
 707  Write data to a fd.
 708 ****************************************************************************/
 709
 710 ssize_t write_data(int fd, const char *buffer, size_t N)
 711 {
 712         size_t total=0;
 713         ssize_t ret;
 714         char addr[INET6_ADDRSTRLEN];
 715
 716         while (total < N) {
 717                 ret = sys_write(fd,buffer + total,N - total);
 718
 719                 if (ret == -1) {
 720                         if (fd == get_client_fd()) {
 721                                 /* Try and give an error message saying
 722                                  * what client failed. */
 723                                 DEBUG(0,("write_data: write failure in "
 724                                         "writing to client %s. Error %s\n",
 725                                         get_peer_addr(fd,addr,sizeof(addr)),
 726                                         strerror(errno) ));
 727                         } else {
 728                                 DEBUG(0,("write_data: write failure. "
 729                                         "Error = %s\n", strerror(errno) ));
 730                         }
 731                         return -1;
 732                 }
 733
 734                 if (ret == 0) {
 735                         return total;
 736                 }
 737
 738                 total += ret;
 739         }
 740         return (ssize_t)total;
 741 }
 742
 743 /****************************************************************************
 744  Send a keepalive packet (rfc1002).
 745 ****************************************************************************/
 746
 747 bool send_keepalive(int client)
 748 {
 749         unsigned char buf[4];
 750
 751         buf[0] = SMBkeepalive;
 752         buf[1] = buf[2] = buf[3] = 0;
 753
 754         return(write_data(client,(char *)buf,4) == 4);
 755 }
 756
 757 /****************************************************************************
 758  Read 4 bytes of a smb packet and return the smb length of the packet.
 759  Store the result in the buffer.
 760  This version of the function will return a length of zero on receiving
 761  a keepalive packet.
 762  Timeout is in milliseconds.
 763 ****************************************************************************/
 764
 765 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 766                                           unsigned int timeout,
 767                                           size_t *len)
 768 {
 769         int msg_type;
 770         NTSTATUS status;
 771
 772         status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 773
 774         if (!NT_STATUS_IS_OK(status)) {
 775                 return status;
 776         }
 777
 778         *len = smb_len(inbuf);
 779         msg_type = CVAL(inbuf,0);
 780
 781         if (msg_type == SMBkeepalive) {
 782                 DEBUG(5,("Got keepalive packet\n"));
 783         }
 784
 785         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 786
 787         return NT_STATUS_OK;
 788 }
 789
 790 /****************************************************************************
 791  Read 4 bytes of a smb packet and return the smb length of the packet.
 792  Store the result in the buffer. This version of the function will
 793  never return a session keepalive (length of zero).
 794  Timeout is in milliseconds.
 795 ****************************************************************************/
 796
 797 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
 798                          size_t *len)
 799 {
 800         uint8_t msgtype = SMBkeepalive;
 801
 802         while (msgtype == SMBkeepalive) {
 803                 NTSTATUS status;
 804
 805                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
 806                                                           len);
 807                 if (!NT_STATUS_IS_OK(status)) {
 808                         return status;
 809                 }
 810
 811                 msgtype = CVAL(inbuf, 0);
 812         }
 813
 814         DEBUG(10,("read_smb_length: got smb length of %lu\n",
 815                   (unsigned long)len));
 816
 817         return NT_STATUS_OK;
 818 }
 819
 820 /****************************************************************************
 821  Read an smb from a fd.
 822  The timeout is in milliseconds.
 823  This function will return on receipt of a session keepalive packet.
 824  maxlen is the max number of bytes to return, not including the 4 byte
 825  length. If zero it means buflen limit.
 826  Doesn't check the MAC on signed packets.
 827 ****************************************************************************/
 828
 829 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 830                          size_t maxlen, size_t *p_len)
 831 {
 832         size_t len;
 833         NTSTATUS status;
 834
 835         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 836
 837         if (!NT_STATUS_IS_OK(status)) {
 838                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
 839                 return status;
 840         }
 841
 842         if (len > buflen) {
 843                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 844                                         (unsigned long)len));
 845                 return NT_STATUS_INVALID_PARAMETER;
 846         }
 847
 848         if(len > 0) {
 849                 if (maxlen) {
 850                         len = MIN(len,maxlen);
 851                 }
 852
 853                 status = read_socket_with_timeout(
 854                         fd, buffer+4, len, len, timeout, &len);
 855
 856                 if (!NT_STATUS_IS_OK(status)) {
 857                         return status;
 858                 }
 859
 860                 /* not all of samba3 properly checks for packet-termination
 861                  * of strings. This ensures that we don't run off into
 862                  * empty space. */
 863                 SSVAL(buffer+4,len, 0);
 864         }
 865
 866         *p_len = len;
 867         return NT_STATUS_OK;
 868 }
 869
 870 /****************************************************************************
 871  Open a socket of the specified type, port, and address for incoming data.
 872 ****************************************************************************/
 873
 874 int open_socket_in(int type,
 875                 uint16_t port,
 876                 int dlevel,
 877                 const struct sockaddr_storage *psock,
 878                 bool rebind)
 879 {
 880         struct sockaddr_storage sock;
 881         int res;
 882         socklen_t slen = sizeof(struct sockaddr_in);
 883
 884         sock = *psock;
 885
 886 #if defined(HAVE_IPV6)
 887         if (sock.ss_family == AF_INET6) {
 888                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 889                 slen = sizeof(struct sockaddr_in6);
 890         }
 891 #endif
 892         if (sock.ss_family == AF_INET) {
 893                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 894         }
 895
 896         res = socket(sock.ss_family, type, 0 );
 897         if( res == -1 ) {
 898                 if( DEBUGLVL(0) ) {
 899                         dbgtext( "open_socket_in(): socket() call failed: " );
 900                         dbgtext( "%s\n", strerror( errno ) );
 901                 }
 902                 return -1;
 903         }
 904
 905         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 906         {
 907                 int val = rebind ? 1 : 0;
 908                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 909                                         (char *)&val,sizeof(val)) == -1 ) {
 910                         if( DEBUGLVL( dlevel ) ) {
 911                                 dbgtext( "open_socket_in(): setsockopt: " );
 912                                 dbgtext( "SO_REUSEADDR = %s ",
 913                                                 val?"true":"false" );
 914                                 dbgtext( "on port %d failed ", port );
 915                                 dbgtext( "with error = %s\n", strerror(errno) );
 916                         }
 917                 }
 918 #ifdef SO_REUSEPORT
 919                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 920                                         (char *)&val,sizeof(val)) == -1 ) {
 921                         if( DEBUGLVL( dlevel ) ) {
 922                                 dbgtext( "open_socket_in(): setsockopt: ");
 923                                 dbgtext( "SO_REUSEPORT = %s ",
 924                                                 val?"true":"false");
 925                                 dbgtext( "on port %d failed ", port);
 926                                 dbgtext( "with error = %s\n", strerror(errno));
 927                         }
 928                 }
 929 #endif /* SO_REUSEPORT */
 930         }
 931
 932         /* now we've got a socket - we need to bind it */
 933         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 934                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 935                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 936                         char addr[INET6_ADDRSTRLEN];
 937                         print_sockaddr(addr, sizeof(addr),
 938                                         &sock);
 939                         dbgtext( "bind failed on port %d ", port);
 940                         dbgtext( "socket_addr = %s.\n", addr);
 941                         dbgtext( "Error = %s\n", strerror(errno));
 942                 }
 943                 close(res);
 944                 return -1;
 945         }
 946
 947         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 948         return( res );
 949  }
 950
 951 /****************************************************************************
 952  Create an outgoing socket. timeout is in milliseconds.
 953 **************************************************************************/
 954
 955 int open_socket_out(int type,
 956                 const struct sockaddr_storage *pss,
 957                 uint16_t port,
 958                 int timeout)
 959 {
 960         char addr[INET6_ADDRSTRLEN];
 961         struct sockaddr_storage sock_out = *pss;
 962         int res,ret;
 963         int connect_loop = 10;
 964         int increment = 10;
 965
 966         /* create a socket to write to */
 967         res = socket(pss->ss_family, type, 0);
 968         if (res == -1) {
 969                 DEBUG(0,("socket error (%s)\n", strerror(errno)));
 970                 return -1;
 971         }
 972
 973         if (type != SOCK_STREAM) {
 974                 return res;
 975         }
 976
 977 #if defined(HAVE_IPV6)
 978         if (pss->ss_family == AF_INET6) {
 979                 struct sockaddr_in6 *psa6 = (struct sockaddr_in6 *)&sock_out;
 980                 psa6->sin6_port = htons(port);
 981                 if (psa6->sin6_scope_id == 0 &&
 982                                 IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 983                         setup_linklocal_scope_id((struct sockaddr *)&sock_out);
 984                 }
 985         }
 986 #endif
 987         if (pss->ss_family == AF_INET) {
 988                 struct sockaddr_in *psa = (struct sockaddr_in *)&sock_out;
 989                 psa->sin_port = htons(port);
 990         }
 991
 992         /* set it non-blocking */
 993         set_blocking(res,false);
 994
 995         print_sockaddr(addr, sizeof(addr), &sock_out);
 996         DEBUG(3,("Connecting to %s at port %u\n",
 997                                 addr,
 998                                 (unsigned int)port));
 999
1000         /* and connect it to the destination */
1001   connect_again:
1002
1003         ret = sys_connect(res, (struct sockaddr *)&sock_out);
1004
1005         /* Some systems return EAGAIN when they mean EINPROGRESS */
1006         if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1007                         errno == EAGAIN) && (connect_loop < timeout) ) {
1008                 smb_msleep(connect_loop);
1009                 timeout -= connect_loop;
1010                 connect_loop += increment;
1011                 if (increment < 250) {
1012                         /* After 8 rounds we end up at a max of 255 msec */
1013                         increment *= 1.5;
1014                 }
1015                 goto connect_again;
1016         }
1017
1018         if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1019                         errno == EAGAIN)) {
1020                 DEBUG(1,("timeout connecting to %s:%u\n",
1021                                         addr,
1022                                         (unsigned int)port));
1023                 close(res);
1024                 return -1;
1025         }
1026
1027 #ifdef EISCONN
1028         if (ret < 0 && errno == EISCONN) {
1029                 errno = 0;
1030                 ret = 0;
1031         }
1032 #endif
1033
1034         if (ret < 0) {
1035                 DEBUG(2,("error connecting to %s:%d (%s)\n",
1036                                 addr,
1037                                 (unsigned int)port,
1038                                 strerror(errno)));
1039                 close(res);
1040                 return -1;
1041         }
1042
1043         /* set it blocking again */
1044         set_blocking(res,true);
1045
1046         return res;
1047 }
1048
1049 /*******************************************************************
1050  Create an outgoing TCP socket to the first addr that connects.
1051
1052  This is for simultaneous connection attempts to port 445 and 139 of a host
1053  or for simultatneous connection attempts to multiple DCs at once.  We return
1054  a socket fd of the first successful connection.
1055
1056  @param[in] addrs list of Internet addresses and ports to connect to
1057  @param[in] num_addrs number of address/port pairs in the addrs list
1058  @param[in] timeout time after which we stop waiting for a socket connection
1059             to succeed, given in milliseconds
1060  @param[out] fd_index the entry in addrs which we successfully connected to
1061  @param[out] fd fd of the open and connected socket
1062  @return true on a successful connection, false if all connection attempts
1063          failed or we timed out
1064 *******************************************************************/
1065
1066 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1067                          int timeout, int *fd_index, int *fd)
1068 {
1069         int i, resulting_index, res;
1070         int *sockets;
1071         bool good_connect;
1072
1073         fd_set r_fds, wr_fds;
1074         struct timeval tv;
1075         int maxfd;
1076
1077         int connect_loop = 10000; /* 10 milliseconds */
1078
1079         timeout *= 1000;        /* convert to microseconds */
1080
1081         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1082
1083         if (sockets == NULL)
1084                 return false;
1085
1086         resulting_index = -1;
1087
1088         for (i=0; i<num_addrs; i++)
1089                 sockets[i] = -1;
1090
1091         for (i=0; i<num_addrs; i++) {
1092                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1093                 if (sockets[i] < 0)
1094                         goto done;
1095                 set_blocking(sockets[i], false);
1096         }
1097
1098  connect_again:
1099         good_connect = false;
1100
1101         for (i=0; i<num_addrs; i++) {
1102                 const struct sockaddr * a =
1103                     (const struct sockaddr *)&(addrs[i]);
1104
1105                 if (sockets[i] == -1)
1106                         continue;
1107
1108                 if (sys_connect(sockets[i], a) == 0) {
1109                         /* Rather unlikely as we are non-blocking, but it
1110                          * might actually happen. */
1111                         resulting_index = i;
1112                         goto done;
1113                 }
1114
1115                 if (errno == EINPROGRESS || errno == EALREADY ||
1116 #ifdef EISCONN
1117                         errno == EISCONN ||
1118 #endif
1119                     errno == EAGAIN || errno == EINTR) {
1120                         /* These are the error messages that something is
1121                            progressing. */
1122                         good_connect = true;
1123                 } else if (errno != 0) {
1124                         /* There was a direct error */
1125                         close(sockets[i]);
1126                         sockets[i] = -1;
1127                 }
1128         }
1129
1130         if (!good_connect) {
1131                 /* All of the connect's resulted in real error conditions */
1132                 goto done;
1133         }
1134
1135         /* Lets see if any of the connect attempts succeeded */
1136
1137         maxfd = 0;
1138         FD_ZERO(&wr_fds);
1139         FD_ZERO(&r_fds);
1140
1141         for (i=0; i<num_addrs; i++) {
1142                 if (sockets[i] == -1)
1143                         continue;
1144                 FD_SET(sockets[i], &wr_fds);
1145                 FD_SET(sockets[i], &r_fds);
1146                 if (sockets[i]>maxfd)
1147                         maxfd = sockets[i];
1148         }
1149
1150         tv.tv_sec = 0;
1151         tv.tv_usec = connect_loop;
1152
1153         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1154
1155         if (res < 0)
1156                 goto done;
1157
1158         if (res == 0)
1159                 goto next_round;
1160
1161         for (i=0; i<num_addrs; i++) {
1162
1163                 if (sockets[i] == -1)
1164                         continue;
1165
1166                 /* Stevens, Network Programming says that if there's a
1167                  * successful connect, the socket is only writable. Upon an
1168                  * error, it's both readable and writable. */
1169
1170                 if (FD_ISSET(sockets[i], &r_fds) &&
1171                     FD_ISSET(sockets[i], &wr_fds)) {
1172                         /* readable and writable, so it's an error */
1173                         close(sockets[i]);
1174                         sockets[i] = -1;
1175                         continue;
1176                 }
1177
1178                 if (!FD_ISSET(sockets[i], &r_fds) &&
1179                     FD_ISSET(sockets[i], &wr_fds)) {
1180                         /* Only writable, so it's connected */
1181                         resulting_index = i;
1182                         goto done;
1183                 }
1184         }
1185
1186  next_round:
1187
1188         timeout -= connect_loop;
1189         if (timeout <= 0)
1190                 goto done;
1191         connect_loop *= 1.5;
1192         if (connect_loop > timeout)
1193                 connect_loop = timeout;
1194         goto connect_again;
1195
1196  done:
1197         for (i=0; i<num_addrs; i++) {
1198                 if (i == resulting_index)
1199                         continue;
1200                 if (sockets[i] >= 0)
1201                         close(sockets[i]);
1202         }
1203
1204         if (resulting_index >= 0) {
1205                 *fd_index = resulting_index;
1206                 *fd = sockets[*fd_index];
1207                 set_blocking(*fd, true);
1208         }
1209
1210         free(sockets);
1211
1212         return (resulting_index >= 0);
1213 }
1214 /****************************************************************************
1215  Open a connected UDP socket to host on port
1216 **************************************************************************/
1217
1218 int open_udp_socket(const char *host, int port)
1219 {
1220         int type = SOCK_DGRAM;
1221         struct sockaddr_in sock_out;
1222         int res;
1223         struct in_addr addr;
1224
1225         addr = interpret_addr2(host);
1226
1227         res = socket(PF_INET, type, 0);
1228         if (res == -1) {
1229                 return -1;
1230         }
1231
1232         memset((char *)&sock_out,'\0',sizeof(sock_out));
1233         putip((char *)&sock_out.sin_addr,(char *)&addr);
1234         sock_out.sin_port = htons(port);
1235         sock_out.sin_family = PF_INET;
1236
1237         if (sys_connect(res,(struct sockaddr *)&sock_out)) {
1238                 close(res);
1239                 return -1;
1240         }
1241
1242         return res;
1243 }
1244
1245 /*******************************************************************
1246  Return the IP addr of the remote end of a socket as a string.
1247  Optionally return the struct sockaddr_storage.
1248  ******************************************************************/
1249
1250 static const char *get_peer_addr_internal(int fd,
1251                                 char *addr_buf,
1252                                 size_t addr_buf_len,
1253                                 struct sockaddr *pss,
1254                                 socklen_t *plength)
1255 {
1256         struct sockaddr_storage ss;
1257         socklen_t length = sizeof(ss);
1258
1259         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1260
1261         if (fd == -1) {
1262                 return addr_buf;
1263         }
1264
1265         if (pss == NULL) {
1266                 pss = (struct sockaddr *)&ss;
1267                 plength = &length;
1268         }
1269
1270         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1271                 DEBUG(0,("getpeername failed. Error was %s\n",
1272                                         strerror(errno) ));
1273                 return addr_buf;
1274         }
1275
1276         print_sockaddr_len(addr_buf,
1277                         addr_buf_len,
1278                         pss,
1279                         *plength);
1280         return addr_buf;
1281 }
1282
1283 /*******************************************************************
1284  Matchname - determine if host name matches IP address. Used to
1285  confirm a hostname lookup to prevent spoof attacks.
1286 ******************************************************************/
1287
1288 static bool matchname(const char *remotehost,
1289                 const struct sockaddr *pss,
1290                 socklen_t len)
1291 {
1292         struct addrinfo *res = NULL;
1293         struct addrinfo *ailist = NULL;
1294         char addr_buf[INET6_ADDRSTRLEN];
1295         bool ret = interpret_string_addr_internal(&ailist,
1296                         remotehost,
1297                         AI_ADDRCONFIG|AI_CANONNAME);
1298
1299         if (!ret || ailist == NULL) {
1300                 DEBUG(3,("matchname: getaddrinfo failed for "
1301                         "name %s [%s]\n",
1302                         remotehost,
1303                         gai_strerror(ret) ));
1304                 return false;
1305         }
1306
1307         /*
1308          * Make sure that getaddrinfo() returns the "correct" host name.
1309          */
1310
1311         if (ailist->ai_canonname == NULL ||
1312                 (!strequal(remotehost, ailist->ai_canonname) &&
1313                  !strequal(remotehost, "localhost"))) {
1314                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1315                          remotehost,
1316                          ailist->ai_canonname ?
1317                                  ailist->ai_canonname : "(NULL)"));
1318                 freeaddrinfo(ailist);
1319                 return false;
1320         }
1321
1322         /* Look up the host address in the address list we just got. */
1323         for (res = ailist; res; res = res->ai_next) {
1324                 if (!res->ai_addr) {
1325                         continue;
1326                 }
1327                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1328                                         (struct sockaddr *)pss)) {
1329                         freeaddrinfo(ailist);
1330                         return true;
1331                 }
1332         }
1333
1334         /*
1335          * The host name does not map to the original host address. Perhaps
1336          * someone has compromised a name server. More likely someone botched
1337          * it, but that could be dangerous, too.
1338          */
1339
1340         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1341                 print_sockaddr_len(addr_buf,
1342                         sizeof(addr_buf),
1343                         pss,
1344                         len),
1345                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1346
1347         if (ailist) {
1348                 freeaddrinfo(ailist);
1349         }
1350         return false;
1351 }
1352
1353 /*******************************************************************
1354  Deal with the singleton cache.
1355 ******************************************************************/
1356
1357 struct name_addr_pair {
1358         struct sockaddr_storage ss;
1359         const char *name;
1360 };
1361
1362 /*******************************************************************
1363  Lookup a name/addr pair. Returns memory allocated from memcache.
1364 ******************************************************************/
1365
1366 static bool lookup_nc(struct name_addr_pair *nc)
1367 {
1368         DATA_BLOB tmp;
1369
1370         ZERO_STRUCTP(nc);
1371
1372         if (!memcache_lookup(
1373                         NULL, SINGLETON_CACHE,
1374                         data_blob_string_const_null("get_peer_name"),
1375                         &tmp)) {
1376                 return false;
1377         }
1378
1379         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1380         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1381         return true;
1382 }
1383
1384 /*******************************************************************
1385  Save a name/addr pair.
1386 ******************************************************************/
1387
1388 static void store_nc(const struct name_addr_pair *nc)
1389 {
1390         DATA_BLOB tmp;
1391         size_t namelen = strlen(nc->name);
1392
1393         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1394         if (!tmp.data) {
1395                 return;
1396         }
1397         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1398         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1399
1400         memcache_add(NULL, SINGLETON_CACHE,
1401                         data_blob_string_const_null("get_peer_name"),
1402                         tmp);
1403         data_blob_free(&tmp);
1404 }
1405
1406 /*******************************************************************
1407  Return the DNS name of the remote end of a socket.
1408 ******************************************************************/
1409
1410 const char *get_peer_name(int fd, bool force_lookup)
1411 {
1412         struct name_addr_pair nc;
1413         char addr_buf[INET6_ADDRSTRLEN];
1414         struct sockaddr_storage ss;
1415         socklen_t length = sizeof(ss);
1416         const char *p;
1417         int ret;
1418         char name_buf[MAX_DNS_NAME_LENGTH];
1419         char tmp_name[MAX_DNS_NAME_LENGTH];
1420
1421         /* reverse lookups can be *very* expensive, and in many
1422            situations won't work because many networks don't link dhcp
1423            with dns. To avoid the delay we avoid the lookup if
1424            possible */
1425         if (!lp_hostname_lookups() && (force_lookup == false)) {
1426                 length = sizeof(nc.ss);
1427                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1428                         (struct sockaddr *)&nc.ss, &length);
1429                 store_nc(&nc);
1430                 lookup_nc(&nc);
1431                 return nc.name ? nc.name : "UNKNOWN";
1432         }
1433
1434         lookup_nc(&nc);
1435
1436         memset(&ss, '\0', sizeof(ss));
1437         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1438
1439         /* it might be the same as the last one - save some DNS work */
1440         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1441                 return nc.name ? nc.name : "UNKNOWN";
1442         }
1443
1444         /* Not the same. We need to lookup. */
1445         if (fd == -1) {
1446                 return "UNKNOWN";
1447         }
1448
1449         /* Look up the remote host name. */
1450         ret = sys_getnameinfo((struct sockaddr *)&ss,
1451                         length,
1452                         name_buf,
1453                         sizeof(name_buf),
1454                         NULL,
1455                         0,
1456                         0);
1457
1458         if (ret) {
1459                 DEBUG(1,("get_peer_name: getnameinfo failed "
1460                         "for %s with error %s\n",
1461                         p,
1462                         gai_strerror(ret)));
1463                 strlcpy(name_buf, p, sizeof(name_buf));
1464         } else {
1465                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1466                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1467                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1468                 }
1469         }
1470
1471         /* can't pass the same source and dest strings in when you
1472            use --enable-developer or the clobber_region() call will
1473            get you */
1474
1475         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1476         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1477         if (strstr(name_buf,"..")) {
1478                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1479         }
1480
1481         nc.name = name_buf;
1482         nc.ss = ss;
1483
1484         store_nc(&nc);
1485         lookup_nc(&nc);
1486         return nc.name ? nc.name : "UNKNOWN";
1487 }
1488
1489 /*******************************************************************
1490  Return the IP addr of the remote end of a socket as a string.
1491  ******************************************************************/
1492
1493 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1494 {
1495         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1496 }
1497
1498 /*******************************************************************
1499  Create protected unix domain socket.
1500
1501  Some unixes cannot set permissions on a ux-dom-sock, so we
1502  have to make sure that the directory contains the protection
1503  permissions instead.
1504  ******************************************************************/
1505
1506 int create_pipe_sock(const char *socket_dir,
1507                      const char *socket_name,
1508                      mode_t dir_perms)
1509 {
1510 #ifdef HAVE_UNIXSOCKET
1511         struct sockaddr_un sunaddr;
1512         struct stat st;
1513         int sock;
1514         mode_t old_umask;
1515         char *path = NULL;
1516
1517         old_umask = umask(0);
1518
1519         /* Create the socket directory or reuse the existing one */
1520
1521         if (lstat(socket_dir, &st) == -1) {
1522                 if (errno == ENOENT) {
1523                         /* Create directory */
1524                         if (mkdir(socket_dir, dir_perms) == -1) {
1525                                 DEBUG(0, ("error creating socket directory "
1526                                         "%s: %s\n", socket_dir,
1527                                         strerror(errno)));
1528                                 goto out_umask;
1529                         }
1530                 } else {
1531                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1532                                 socket_dir, strerror(errno)));
1533                         goto out_umask;
1534                 }
1535         } else {
1536                 /* Check ownership and permission on existing directory */
1537                 if (!S_ISDIR(st.st_mode)) {
1538                         DEBUG(0, ("socket directory %s isn't a directory\n",
1539                                 socket_dir));
1540                         goto out_umask;
1541                 }
1542                 if ((st.st_uid != sec_initial_uid()) ||
1543                                 ((st.st_mode & 0777) != dir_perms)) {
1544                         DEBUG(0, ("invalid permissions on socket directory "
1545                                 "%s\n", socket_dir));
1546                         goto out_umask;
1547                 }
1548         }
1549
1550         /* Create the socket file */
1551
1552         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1553
1554         if (sock == -1) {
1555                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1556                         strerror(errno) ));
1557                 goto out_close;
1558         }
1559
1560         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1561                 goto out_close;
1562         }
1563
1564         unlink(path);
1565         memset(&sunaddr, 0, sizeof(sunaddr));
1566         sunaddr.sun_family = AF_UNIX;
1567         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1568
1569         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1570                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1571                         strerror(errno)));
1572                 goto out_close;
1573         }
1574
1575         if (listen(sock, 5) == -1) {
1576                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1577                         strerror(errno)));
1578                 goto out_close;
1579         }
1580
1581         SAFE_FREE(path);
1582
1583         umask(old_umask);
1584         return sock;
1585
1586 out_close:
1587         SAFE_FREE(path);
1588         if (sock != -1)
1589                 close(sock);
1590
1591 out_umask:
1592         umask(old_umask);
1593         return -1;
1594
1595 #else
1596         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1597         return -1;
1598 #endif /* HAVE_UNIXSOCKET */
1599 }
1600
1601 /****************************************************************************
1602  Get my own canonical name, including domain.
1603 ****************************************************************************/
1604
1605 const char *get_mydnsfullname(void)
1606 {
1607         struct addrinfo *res = NULL;
1608         char my_hostname[HOST_NAME_MAX];
1609         bool ret;
1610         DATA_BLOB tmp;
1611
1612         if (memcache_lookup(NULL, SINGLETON_CACHE,
1613                         data_blob_string_const_null("get_mydnsfullname"),
1614                         &tmp)) {
1615                 SMB_ASSERT(tmp.length > 0);
1616                 return (const char *)tmp.data;
1617         }
1618
1619         /* get my host name */
1620         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1621                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1622                 return NULL;
1623         }
1624
1625         /* Ensure null termination. */
1626         my_hostname[sizeof(my_hostname)-1] = '\0';
1627
1628         ret = interpret_string_addr_internal(&res,
1629                                 my_hostname,
1630                                 AI_ADDRCONFIG|AI_CANONNAME);
1631
1632         if (!ret || res == NULL) {
1633                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1634                         "name %s [%s]\n",
1635                         my_hostname,
1636                         gai_strerror(ret) ));
1637                 return NULL;
1638         }
1639
1640         /*
1641          * Make sure that getaddrinfo() returns the "correct" host name.
1642          */
1643
1644         if (res->ai_canonname == NULL) {
1645                 DEBUG(3,("get_mydnsfullname: failed to get "
1646                         "canonical name for %s\n",
1647                         my_hostname));
1648                 freeaddrinfo(res);
1649                 return NULL;
1650         }
1651
1652         /* This copies the data, so we must do a lookup
1653          * afterwards to find the value to return.
1654          */
1655
1656         memcache_add(NULL, SINGLETON_CACHE,
1657                         data_blob_string_const_null("get_mydnsfullname"),
1658                         data_blob_string_const_null(res->ai_canonname));
1659
1660         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1661                         data_blob_string_const_null("get_mydnsfullname"),
1662                         &tmp)) {
1663                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1664                                 strlen(res->ai_canonname) + 1);
1665         }
1666
1667         freeaddrinfo(res);
1668
1669         return (const char *)tmp.data;
1670 }
1671
1672 /************************************************************
1673  Is this my name ?
1674 ************************************************************/
1675
1676 bool is_myname_or_ipaddr(const char *s)
1677 {
1678         TALLOC_CTX *ctx = talloc_tos();
1679         char *name = NULL;
1680         const char *dnsname;
1681         char *servername = NULL;
1682
1683         if (!s) {
1684                 return false;
1685         }
1686
1687         /* Santize the string from '\\name' */
1688         name = talloc_strdup(ctx, s);
1689         if (!name) {
1690                 return false;
1691         }
1692
1693         servername = strrchr_m(name, '\\' );
1694         if (!servername) {
1695                 servername = name;
1696         } else {
1697                 servername++;
1698         }
1699
1700         /* Optimize for the common case */
1701         if (strequal(servername, global_myname())) {
1702                 return true;
1703         }
1704
1705         /* Check for an alias */
1706         if (is_myname(servername)) {
1707                 return true;
1708         }
1709
1710         /* Check for loopback */
1711         if (strequal(servername, "127.0.0.1") ||
1712                         strequal(servername, "::1")) {
1713                 return true;
1714         }
1715
1716         if (strequal(servername, "localhost")) {
1717                 return true;
1718         }
1719
1720         /* Maybe it's my dns name */
1721         dnsname = get_mydnsfullname();
1722         if (dnsname && strequal(servername, dnsname)) {
1723                 return true;
1724         }
1725
1726         /* Handle possible CNAME records - convert to an IP addr. */
1727         if (!is_ipaddress(servername)) {
1728                 /* Use DNS to resolve the name, but only the first address */
1729                 struct sockaddr_storage ss;
1730                 if (interpret_string_addr(&ss, servername,0)) {
1731                         print_sockaddr(name,
1732                                         sizeof(name),
1733                                         &ss);
1734                         servername = name;
1735                 }
1736         }
1737
1738         /* Maybe its an IP address? */
1739         if (is_ipaddress(servername)) {
1740                 struct sockaddr_storage ss;
1741                 struct iface_struct *nics;
1742                 int i, n;
1743
1744                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1745                         return false;
1746                 }
1747
1748                 if (is_zero_addr((struct sockaddr *)&ss) ||
1749                         is_loopback_addr((struct sockaddr *)&ss)) {
1750                         return false;
1751                 }
1752
1753                 nics = TALLOC_ARRAY(ctx, struct iface_struct,
1754                                         MAX_INTERFACES);
1755                 if (!nics) {
1756                         return false;
1757                 }
1758                 n = get_interfaces(nics, MAX_INTERFACES);
1759                 for (i=0; i<n; i++) {
1760                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1761                                 TALLOC_FREE(nics);
1762                                 return true;
1763                         }
1764                 }
1765                 TALLOC_FREE(nics);
1766         }
1767
1768         /* No match */
1769         return false;
1770 }