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 /****************************************************************************
 212  Return the port number we've bound to on a socket.
 213 ****************************************************************************/
 214
 215 int get_socket_port(int fd)
 216 {
 217         struct sockaddr_storage sa;
 218         socklen_t length = sizeof(sa);
 219
 220         if (fd == -1) {
 221                 return -1;
 222         }
 223
 224         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 225                 DEBUG(0,("getpeername failed. Error was %s\n",
 226                         strerror(errno) ));
 227                 return -1;
 228         }
 229
 230 #if defined(HAVE_IPV6)
 231         if (sa.ss_family == AF_INET6) {
 232                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
 233         }
 234 #endif
 235         if (sa.ss_family == AF_INET) {
 236                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
 237         }
 238         return -1;
 239 }
 240
 241 const char *client_name(int fd)
 242 {
 243         return get_peer_name(fd,false);
 244 }
 245
 246 const char *client_addr(int fd, char *addr, size_t addrlen)
 247 {
 248         return get_peer_addr(fd,addr,addrlen);
 249 }
 250
 251 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
 252 {
 253         return get_socket_addr(fd, addr, addr_len);
 254 }
 255
 256 #if 0
 257 /* Not currently used. JRA. */
 258 int client_socket_port(int fd)
 259 {
 260         return get_socket_port(fd);
 261 }
 262 #endif
 263
 264 /****************************************************************************
 265  Accessor functions to make thread-safe code easier later...
 266 ****************************************************************************/
 267
 268 void set_smb_read_error(enum smb_read_errors *pre,
 269                         enum smb_read_errors newerr)
 270 {
 271         if (pre) {
 272                 *pre = newerr;
 273         }
 274 }
 275
 276 void cond_set_smb_read_error(enum smb_read_errors *pre,
 277                         enum smb_read_errors newerr)
 278 {
 279         if (pre && *pre == SMB_READ_OK) {
 280                 *pre = newerr;
 281         }
 282 }
 283
 284 /****************************************************************************
 285  Determine if a file descriptor is in fact a socket.
 286 ****************************************************************************/
 287
 288 bool is_a_socket(int fd)
 289 {
 290         int v;
 291         socklen_t l;
 292         l = sizeof(int);
 293         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
 294 }
 295
 296 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
 297
 298 typedef struct smb_socket_option {
 299         const char *name;
 300         int level;
 301         int option;
 302         int value;
 303         int opttype;
 304 } smb_socket_option;
 305
 306 static const smb_socket_option socket_options[] = {
 307   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
 308   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
 309   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
 310 #ifdef TCP_NODELAY
 311   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
 312 #endif
 313 #ifdef TCP_KEEPCNT
 314   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
 315 #endif
 316 #ifdef TCP_KEEPIDLE
 317   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
 318 #endif
 319 #ifdef TCP_KEEPINTVL
 320   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
 321 #endif
 322 #ifdef IPTOS_LOWDELAY
 323   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
 324 #endif
 325 #ifdef IPTOS_THROUGHPUT
 326   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
 327 #endif
 328 #ifdef SO_REUSEPORT
 329   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
 330 #endif
 331 #ifdef SO_SNDBUF
 332   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
 333 #endif
 334 #ifdef SO_RCVBUF
 335   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
 336 #endif
 337 #ifdef SO_SNDLOWAT
 338   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
 339 #endif
 340 #ifdef SO_RCVLOWAT
 341   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
 342 #endif
 343 #ifdef SO_SNDTIMEO
 344   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
 345 #endif
 346 #ifdef SO_RCVTIMEO
 347   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
 348 #endif
 349 #ifdef TCP_FASTACK
 350   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
 351 #endif
 352 #ifdef TCP_QUICKACK
 353   {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL},
 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_recv(fd, buf + nread, maxcnt - nread, 0);
 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_recv(fd, buf+nread, maxcnt-nread, 0);
 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 = (void *)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         ssize_t ret;
 713         struct iovec iov;
 714
 715         iov.iov_base = CONST_DISCARD(void *, buffer);
 716         iov.iov_len = N;
 717
 718         ret = write_data_iov(fd, &iov, 1);
 719         if (ret >= 0) {
 720                 return ret;
 721         }
 722
 723         if (fd == get_client_fd()) {
 724                 char addr[INET6_ADDRSTRLEN];
 725                 /*
 726                  * Try and give an error message saying what client failed.
 727                  */
 728                 DEBUG(0, ("write_data: write failure in writing to client %s. "
 729                           "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
 730                           strerror(errno)));
 731         } else {
 732                 DEBUG(0,("write_data: write failure. Error = %s\n",
 733                          strerror(errno) ));
 734         }
 735
 736         return -1;
 737 }
 738
 739 /****************************************************************************
 740  Send a keepalive packet (rfc1002).
 741 ****************************************************************************/
 742
 743 bool send_keepalive(int client)
 744 {
 745         unsigned char buf[4];
 746
 747         buf[0] = SMBkeepalive;
 748         buf[1] = buf[2] = buf[3] = 0;
 749
 750         return(write_data(client,(char *)buf,4) == 4);
 751 }
 752
 753 /****************************************************************************
 754  Read 4 bytes of a smb packet and return the smb length of the packet.
 755  Store the result in the buffer.
 756  This version of the function will return a length of zero on receiving
 757  a keepalive packet.
 758  Timeout is in milliseconds.
 759 ****************************************************************************/
 760
 761 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 762                                           unsigned int timeout,
 763                                           size_t *len)
 764 {
 765         int msg_type;
 766         NTSTATUS status;
 767
 768         status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 769
 770         if (!NT_STATUS_IS_OK(status)) {
 771                 return status;
 772         }
 773
 774         *len = smb_len(inbuf);
 775         msg_type = CVAL(inbuf,0);
 776
 777         if (msg_type == SMBkeepalive) {
 778                 DEBUG(5,("Got keepalive packet\n"));
 779         }
 780
 781         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 782
 783         return NT_STATUS_OK;
 784 }
 785
 786 /****************************************************************************
 787  Read 4 bytes of a smb packet and return the smb length of the packet.
 788  Store the result in the buffer. This version of the function will
 789  never return a session keepalive (length of zero).
 790  Timeout is in milliseconds.
 791 ****************************************************************************/
 792
 793 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
 794                          size_t *len)
 795 {
 796         uint8_t msgtype = SMBkeepalive;
 797
 798         while (msgtype == SMBkeepalive) {
 799                 NTSTATUS status;
 800
 801                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
 802                                                           len);
 803                 if (!NT_STATUS_IS_OK(status)) {
 804                         return status;
 805                 }
 806
 807                 msgtype = CVAL(inbuf, 0);
 808         }
 809
 810         DEBUG(10,("read_smb_length: got smb length of %lu\n",
 811                   (unsigned long)len));
 812
 813         return NT_STATUS_OK;
 814 }
 815
 816 /****************************************************************************
 817  Read an smb from a fd.
 818  The timeout is in milliseconds.
 819  This function will return on receipt of a session keepalive packet.
 820  maxlen is the max number of bytes to return, not including the 4 byte
 821  length. If zero it means buflen limit.
 822  Doesn't check the MAC on signed packets.
 823 ****************************************************************************/
 824
 825 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 826                          size_t maxlen, size_t *p_len)
 827 {
 828         size_t len;
 829         NTSTATUS status;
 830
 831         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 832
 833         if (!NT_STATUS_IS_OK(status)) {
 834                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
 835                 return status;
 836         }
 837
 838         if (len > buflen) {
 839                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 840                                         (unsigned long)len));
 841                 return NT_STATUS_INVALID_PARAMETER;
 842         }
 843
 844         if(len > 0) {
 845                 if (maxlen) {
 846                         len = MIN(len,maxlen);
 847                 }
 848
 849                 status = read_socket_with_timeout(
 850                         fd, buffer+4, len, len, timeout, &len);
 851
 852                 if (!NT_STATUS_IS_OK(status)) {
 853                         return status;
 854                 }
 855
 856                 /* not all of samba3 properly checks for packet-termination
 857                  * of strings. This ensures that we don't run off into
 858                  * empty space. */
 859                 SSVAL(buffer+4,len, 0);
 860         }
 861
 862         *p_len = len;
 863         return NT_STATUS_OK;
 864 }
 865
 866 /****************************************************************************
 867  Open a socket of the specified type, port, and address for incoming data.
 868 ****************************************************************************/
 869
 870 int open_socket_in(int type,
 871                 uint16_t port,
 872                 int dlevel,
 873                 const struct sockaddr_storage *psock,
 874                 bool rebind)
 875 {
 876         struct sockaddr_storage sock;
 877         int res;
 878         socklen_t slen = sizeof(struct sockaddr_in);
 879
 880         sock = *psock;
 881
 882 #if defined(HAVE_IPV6)
 883         if (sock.ss_family == AF_INET6) {
 884                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 885                 slen = sizeof(struct sockaddr_in6);
 886         }
 887 #endif
 888         if (sock.ss_family == AF_INET) {
 889                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 890         }
 891
 892         res = socket(sock.ss_family, type, 0 );
 893         if( res == -1 ) {
 894                 if( DEBUGLVL(0) ) {
 895                         dbgtext( "open_socket_in(): socket() call failed: " );
 896                         dbgtext( "%s\n", strerror( errno ) );
 897                 }
 898                 return -1;
 899         }
 900
 901         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 902         {
 903                 int val = rebind ? 1 : 0;
 904                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 905                                         (char *)&val,sizeof(val)) == -1 ) {
 906                         if( DEBUGLVL( dlevel ) ) {
 907                                 dbgtext( "open_socket_in(): setsockopt: " );
 908                                 dbgtext( "SO_REUSEADDR = %s ",
 909                                                 val?"true":"false" );
 910                                 dbgtext( "on port %d failed ", port );
 911                                 dbgtext( "with error = %s\n", strerror(errno) );
 912                         }
 913                 }
 914 #ifdef SO_REUSEPORT
 915                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 916                                         (char *)&val,sizeof(val)) == -1 ) {
 917                         if( DEBUGLVL( dlevel ) ) {
 918                                 dbgtext( "open_socket_in(): setsockopt: ");
 919                                 dbgtext( "SO_REUSEPORT = %s ",
 920                                                 val?"true":"false");
 921                                 dbgtext( "on port %d failed ", port);
 922                                 dbgtext( "with error = %s\n", strerror(errno));
 923                         }
 924                 }
 925 #endif /* SO_REUSEPORT */
 926         }
 927
 928         /* now we've got a socket - we need to bind it */
 929         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 930                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 931                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 932                         char addr[INET6_ADDRSTRLEN];
 933                         print_sockaddr(addr, sizeof(addr),
 934                                         &sock);
 935                         dbgtext( "bind failed on port %d ", port);
 936                         dbgtext( "socket_addr = %s.\n", addr);
 937                         dbgtext( "Error = %s\n", strerror(errno));
 938                 }
 939                 close(res);
 940                 return -1;
 941         }
 942
 943         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 944         return( res );
 945  }
 946
 947 struct open_socket_out_state {
 948         int fd;
 949         struct event_context *ev;
 950         struct sockaddr_storage ss;
 951         socklen_t salen;
 952         uint16_t port;
 953         int wait_nsec;
 954 };
 955
 956 static void open_socket_out_connected(struct tevent_req *subreq);
 957
 958 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 959 {
 960         if (s->fd != -1) {
 961                 close(s->fd);
 962         }
 963         return 0;
 964 }
 965
 966 /****************************************************************************
 967  Create an outgoing socket. timeout is in milliseconds.
 968 **************************************************************************/
 969
 970 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 971                                         struct event_context *ev,
 972                                         const struct sockaddr_storage *pss,
 973                                         uint16_t port,
 974                                         int timeout)
 975 {
 976         char addr[INET6_ADDRSTRLEN];
 977         struct tevent_req *result, *subreq;
 978         struct open_socket_out_state *state;
 979         NTSTATUS status;
 980
 981         result = tevent_req_create(mem_ctx, &state,
 982                                    struct open_socket_out_state);
 983         if (result == NULL) {
 984                 return NULL;
 985         }
 986         state->ev = ev;
 987         state->ss = *pss;
 988         state->port = port;
 989         state->wait_nsec = 10000;
 990         state->salen = -1;
 991
 992         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 993         if (state->fd == -1) {
 994                 status = map_nt_error_from_unix(errno);
 995                 goto post_status;
 996         }
 997         talloc_set_destructor(state, open_socket_out_state_destructor);
 998
 999         if (!tevent_req_set_endtime(
1000                     result, ev, timeval_current_ofs(0, timeout*1000))) {
1001                 goto fail;
1002         }
1003
1004 #if defined(HAVE_IPV6)
1005         if (pss->ss_family == AF_INET6) {
1006                 struct sockaddr_in6 *psa6;
1007                 psa6 = (struct sockaddr_in6 *)&state->ss;
1008                 psa6->sin6_port = htons(port);
1009                 if (psa6->sin6_scope_id == 0
1010                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1011                         setup_linklocal_scope_id(
1012                                 (struct sockaddr *)&(state->ss));
1013                 }
1014                 state->salen = sizeof(struct sockaddr_in6);
1015         }
1016 #endif
1017         if (pss->ss_family == AF_INET) {
1018                 struct sockaddr_in *psa;
1019                 psa = (struct sockaddr_in *)&state->ss;
1020                 psa->sin_port = htons(port);
1021                 state->salen = sizeof(struct sockaddr_in);
1022         }
1023
1024         if (pss->ss_family == AF_UNIX) {
1025                 state->salen = sizeof(struct sockaddr_un);
1026         }
1027
1028         print_sockaddr(addr, sizeof(addr), &state->ss);
1029         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1030
1031         subreq = async_connect_send(state, state->ev, state->fd,
1032                                     (struct sockaddr *)&state->ss,
1033                                     state->salen);
1034         if ((subreq == NULL)
1035             || !tevent_req_set_endtime(
1036                     subreq, state->ev,
1037                     timeval_current_ofs(0, state->wait_nsec))) {
1038                 goto fail;
1039         }
1040         tevent_req_set_callback(subreq, open_socket_out_connected, result);
1041         return result;
1042
1043  post_status:
1044         tevent_req_nterror(result, status);
1045         return tevent_req_post(result, ev);
1046  fail:
1047         TALLOC_FREE(result);
1048         return NULL;
1049 }
1050
1051 static void open_socket_out_connected(struct tevent_req *subreq)
1052 {
1053         struct tevent_req *req =
1054                 tevent_req_callback_data(subreq, struct tevent_req);
1055         struct open_socket_out_state *state =
1056                 tevent_req_data(req, struct open_socket_out_state);
1057         int ret;
1058         int sys_errno;
1059
1060         ret = async_connect_recv(subreq, &sys_errno);
1061         TALLOC_FREE(subreq);
1062         if (ret == 0) {
1063                 tevent_req_done(req);
1064                 return;
1065         }
1066
1067         if (
1068 #ifdef ETIMEDOUT
1069                 (sys_errno == ETIMEDOUT) ||
1070 #endif
1071                 (sys_errno == EINPROGRESS) ||
1072                 (sys_errno == EALREADY) ||
1073                 (sys_errno == EAGAIN)) {
1074
1075                 /*
1076                  * retry
1077                  */
1078
1079                 if (state->wait_nsec < 250000) {
1080                         state->wait_nsec *= 1.5;
1081                 }
1082
1083                 subreq = async_connect_send(state, state->ev, state->fd,
1084                                             (struct sockaddr *)&state->ss,
1085                                             state->salen);
1086                 if (tevent_req_nomem(subreq, req)) {
1087                         return;
1088                 }
1089                 if (!tevent_req_set_endtime(
1090                             subreq, state->ev,
1091                             timeval_current_ofs(0, state->wait_nsec))) {
1092                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1093                         return;
1094                 }
1095                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1096                 return;
1097         }
1098
1099 #ifdef EISCONN
1100         if (sys_errno == EISCONN) {
1101                 tevent_req_done(req);
1102                 return;
1103         }
1104 #endif
1105
1106         /* real error */
1107         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1108 }
1109
1110 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1111 {
1112         struct open_socket_out_state *state =
1113                 tevent_req_data(req, struct open_socket_out_state);
1114         NTSTATUS status;
1115
1116         if (tevent_req_is_nterror(req, &status)) {
1117                 return status;
1118         }
1119         *pfd = state->fd;
1120         state->fd = -1;
1121         return NT_STATUS_OK;
1122 }
1123
1124 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1125                          int timeout, int *pfd)
1126 {
1127         TALLOC_CTX *frame = talloc_stackframe();
1128         struct event_context *ev;
1129         struct tevent_req *req;
1130         NTSTATUS status = NT_STATUS_NO_MEMORY;
1131
1132         ev = event_context_init(frame);
1133         if (ev == NULL) {
1134                 goto fail;
1135         }
1136
1137         req = open_socket_out_send(frame, ev, pss, port, timeout);
1138         if (req == NULL) {
1139                 goto fail;
1140         }
1141         if (!tevent_req_poll(req, ev)) {
1142                 status = NT_STATUS_INTERNAL_ERROR;
1143                 goto fail;
1144         }
1145         status = open_socket_out_recv(req, pfd);
1146  fail:
1147         TALLOC_FREE(frame);
1148         return status;
1149 }
1150
1151 struct open_socket_out_defer_state {
1152         struct event_context *ev;
1153         struct sockaddr_storage ss;
1154         uint16_t port;
1155         int timeout;
1156         int fd;
1157 };
1158
1159 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1160 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1161
1162 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1163                                               struct event_context *ev,
1164                                               struct timeval wait_time,
1165                                               const struct sockaddr_storage *pss,
1166                                               uint16_t port,
1167                                               int timeout)
1168 {
1169         struct tevent_req *req, *subreq;
1170         struct open_socket_out_defer_state *state;
1171
1172         req = tevent_req_create(mem_ctx, &state,
1173                                 struct open_socket_out_defer_state);
1174         if (req == NULL) {
1175                 return NULL;
1176         }
1177         state->ev = ev;
1178         state->ss = *pss;
1179         state->port = port;
1180         state->timeout = timeout;
1181
1182         subreq = tevent_wakeup_send(
1183                 state, ev,
1184                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1185         if (subreq == NULL) {
1186                 goto fail;
1187         }
1188         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1189         return req;
1190  fail:
1191         TALLOC_FREE(req);
1192         return NULL;
1193 }
1194
1195 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1196 {
1197         struct tevent_req *req = tevent_req_callback_data(
1198                 subreq, struct tevent_req);
1199         struct open_socket_out_defer_state *state = tevent_req_data(
1200                 req, struct open_socket_out_defer_state);
1201         bool ret;
1202
1203         ret = tevent_wakeup_recv(subreq);
1204         TALLOC_FREE(subreq);
1205         if (!ret) {
1206                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1207                 return;
1208         }
1209
1210         subreq = open_socket_out_send(state, state->ev, &state->ss,
1211                                       state->port, state->timeout);
1212         if (tevent_req_nomem(subreq, req)) {
1213                 return;
1214         }
1215         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1216 }
1217
1218 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1219 {
1220         struct tevent_req *req = tevent_req_callback_data(
1221                 subreq, struct tevent_req);
1222         struct open_socket_out_defer_state *state = tevent_req_data(
1223                 req, struct open_socket_out_defer_state);
1224         NTSTATUS status;
1225
1226         status = open_socket_out_recv(subreq, &state->fd);
1227         TALLOC_FREE(subreq);
1228         if (!NT_STATUS_IS_OK(status)) {
1229                 tevent_req_nterror(req, status);
1230                 return;
1231         }
1232         tevent_req_done(req);
1233 }
1234
1235 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1236 {
1237         struct open_socket_out_defer_state *state = tevent_req_data(
1238                 req, struct open_socket_out_defer_state);
1239         NTSTATUS status;
1240
1241         if (tevent_req_is_nterror(req, &status)) {
1242                 return status;
1243         }
1244         *pfd = state->fd;
1245         state->fd = -1;
1246         return NT_STATUS_OK;
1247 }
1248
1249 /*******************************************************************
1250  Create an outgoing TCP socket to the first addr that connects.
1251
1252  This is for simultaneous connection attempts to port 445 and 139 of a host
1253  or for simultatneous connection attempts to multiple DCs at once.  We return
1254  a socket fd of the first successful connection.
1255
1256  @param[in] addrs list of Internet addresses and ports to connect to
1257  @param[in] num_addrs number of address/port pairs in the addrs list
1258  @param[in] timeout time after which we stop waiting for a socket connection
1259             to succeed, given in milliseconds
1260  @param[out] fd_index the entry in addrs which we successfully connected to
1261  @param[out] fd fd of the open and connected socket
1262  @return true on a successful connection, false if all connection attempts
1263          failed or we timed out
1264 *******************************************************************/
1265
1266 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1267                          int timeout, int *fd_index, int *fd)
1268 {
1269         int i, resulting_index, res;
1270         int *sockets;
1271         bool good_connect;
1272
1273         fd_set r_fds, wr_fds;
1274         struct timeval tv;
1275         int maxfd;
1276
1277         int connect_loop = 10000; /* 10 milliseconds */
1278
1279         timeout *= 1000;        /* convert to microseconds */
1280
1281         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1282
1283         if (sockets == NULL)
1284                 return false;
1285
1286         resulting_index = -1;
1287
1288         for (i=0; i<num_addrs; i++)
1289                 sockets[i] = -1;
1290
1291         for (i=0; i<num_addrs; i++) {
1292                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1293                 if (sockets[i] < 0)
1294                         goto done;
1295                 set_blocking(sockets[i], false);
1296         }
1297
1298  connect_again:
1299         good_connect = false;
1300
1301         for (i=0; i<num_addrs; i++) {
1302                 const struct sockaddr * a =
1303                     (const struct sockaddr *)&(addrs[i]);
1304
1305                 if (sockets[i] == -1)
1306                         continue;
1307
1308                 if (sys_connect(sockets[i], a) == 0) {
1309                         /* Rather unlikely as we are non-blocking, but it
1310                          * might actually happen. */
1311                         resulting_index = i;
1312                         goto done;
1313                 }
1314
1315                 if (errno == EINPROGRESS || errno == EALREADY ||
1316 #ifdef EISCONN
1317                         errno == EISCONN ||
1318 #endif
1319                     errno == EAGAIN || errno == EINTR) {
1320                         /* These are the error messages that something is
1321                            progressing. */
1322                         good_connect = true;
1323                 } else if (errno != 0) {
1324                         /* There was a direct error */
1325                         close(sockets[i]);
1326                         sockets[i] = -1;
1327                 }
1328         }
1329
1330         if (!good_connect) {
1331                 /* All of the connect's resulted in real error conditions */
1332                 goto done;
1333         }
1334
1335         /* Lets see if any of the connect attempts succeeded */
1336
1337         maxfd = 0;
1338         FD_ZERO(&wr_fds);
1339         FD_ZERO(&r_fds);
1340
1341         for (i=0; i<num_addrs; i++) {
1342                 if (sockets[i] == -1)
1343                         continue;
1344                 FD_SET(sockets[i], &wr_fds);
1345                 FD_SET(sockets[i], &r_fds);
1346                 if (sockets[i]>maxfd)
1347                         maxfd = sockets[i];
1348         }
1349
1350         tv.tv_sec = 0;
1351         tv.tv_usec = connect_loop;
1352
1353         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1354
1355         if (res < 0)
1356                 goto done;
1357
1358         if (res == 0)
1359                 goto next_round;
1360
1361         for (i=0; i<num_addrs; i++) {
1362
1363                 if (sockets[i] == -1)
1364                         continue;
1365
1366                 /* Stevens, Network Programming says that if there's a
1367                  * successful connect, the socket is only writable. Upon an
1368                  * error, it's both readable and writable. */
1369
1370                 if (FD_ISSET(sockets[i], &r_fds) &&
1371                     FD_ISSET(sockets[i], &wr_fds)) {
1372                         /* readable and writable, so it's an error */
1373                         close(sockets[i]);
1374                         sockets[i] = -1;
1375                         continue;
1376                 }
1377
1378                 if (!FD_ISSET(sockets[i], &r_fds) &&
1379                     FD_ISSET(sockets[i], &wr_fds)) {
1380                         /* Only writable, so it's connected */
1381                         resulting_index = i;
1382                         goto done;
1383                 }
1384         }
1385
1386  next_round:
1387
1388         timeout -= connect_loop;
1389         if (timeout <= 0)
1390                 goto done;
1391         connect_loop *= 1.5;
1392         if (connect_loop > timeout)
1393                 connect_loop = timeout;
1394         goto connect_again;
1395
1396  done:
1397         for (i=0; i<num_addrs; i++) {
1398                 if (i == resulting_index)
1399                         continue;
1400                 if (sockets[i] >= 0)
1401                         close(sockets[i]);
1402         }
1403
1404         if (resulting_index >= 0) {
1405                 *fd_index = resulting_index;
1406                 *fd = sockets[*fd_index];
1407                 set_blocking(*fd, true);
1408         }
1409
1410         free(sockets);
1411
1412         return (resulting_index >= 0);
1413 }
1414 /****************************************************************************
1415  Open a connected UDP socket to host on port
1416 **************************************************************************/
1417
1418 int open_udp_socket(const char *host, int port)
1419 {
1420         struct sockaddr_storage ss;
1421         int res;
1422
1423         if (!interpret_string_addr(&ss, host, 0)) {
1424                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1425                         host));
1426                 return -1;
1427         }
1428
1429         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1430         if (res == -1) {
1431                 return -1;
1432         }
1433
1434 #if defined(HAVE_IPV6)
1435         if (ss.ss_family == AF_INET6) {
1436                 struct sockaddr_in6 *psa6;
1437                 psa6 = (struct sockaddr_in6 *)&ss;
1438                 psa6->sin6_port = htons(port);
1439                 if (psa6->sin6_scope_id == 0
1440                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1441                         setup_linklocal_scope_id(
1442                                 (struct sockaddr *)&ss);
1443                 }
1444         }
1445 #endif
1446         if (ss.ss_family == AF_INET) {
1447                 struct sockaddr_in *psa;
1448                 psa = (struct sockaddr_in *)&ss;
1449                 psa->sin_port = htons(port);
1450         }
1451
1452         if (sys_connect(res,(struct sockaddr *)&ss)) {
1453                 close(res);
1454                 return -1;
1455         }
1456
1457         return res;
1458 }
1459
1460 /*******************************************************************
1461  Return the IP addr of the remote end of a socket as a string.
1462  Optionally return the struct sockaddr_storage.
1463  ******************************************************************/
1464
1465 static const char *get_peer_addr_internal(int fd,
1466                                 char *addr_buf,
1467                                 size_t addr_buf_len,
1468                                 struct sockaddr *pss,
1469                                 socklen_t *plength)
1470 {
1471         struct sockaddr_storage ss;
1472         socklen_t length = sizeof(ss);
1473
1474         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1475
1476         if (fd == -1) {
1477                 return addr_buf;
1478         }
1479
1480         if (pss == NULL) {
1481                 pss = (struct sockaddr *)&ss;
1482                 plength = &length;
1483         }
1484
1485         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1486                 DEBUG(0,("getpeername failed. Error was %s\n",
1487                                         strerror(errno) ));
1488                 return addr_buf;
1489         }
1490
1491         print_sockaddr_len(addr_buf,
1492                         addr_buf_len,
1493                         pss,
1494                         *plength);
1495         return addr_buf;
1496 }
1497
1498 /*******************************************************************
1499  Matchname - determine if host name matches IP address. Used to
1500  confirm a hostname lookup to prevent spoof attacks.
1501 ******************************************************************/
1502
1503 static bool matchname(const char *remotehost,
1504                 const struct sockaddr *pss,
1505                 socklen_t len)
1506 {
1507         struct addrinfo *res = NULL;
1508         struct addrinfo *ailist = NULL;
1509         char addr_buf[INET6_ADDRSTRLEN];
1510         bool ret = interpret_string_addr_internal(&ailist,
1511                         remotehost,
1512                         AI_ADDRCONFIG|AI_CANONNAME);
1513
1514         if (!ret || ailist == NULL) {
1515                 DEBUG(3,("matchname: getaddrinfo failed for "
1516                         "name %s [%s]\n",
1517                         remotehost,
1518                         gai_strerror(ret) ));
1519                 return false;
1520         }
1521
1522         /*
1523          * Make sure that getaddrinfo() returns the "correct" host name.
1524          */
1525
1526         if (ailist->ai_canonname == NULL ||
1527                 (!strequal(remotehost, ailist->ai_canonname) &&
1528                  !strequal(remotehost, "localhost"))) {
1529                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1530                          remotehost,
1531                          ailist->ai_canonname ?
1532                                  ailist->ai_canonname : "(NULL)"));
1533                 freeaddrinfo(ailist);
1534                 return false;
1535         }
1536
1537         /* Look up the host address in the address list we just got. */
1538         for (res = ailist; res; res = res->ai_next) {
1539                 if (!res->ai_addr) {
1540                         continue;
1541                 }
1542                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1543                                         (struct sockaddr *)pss)) {
1544                         freeaddrinfo(ailist);
1545                         return true;
1546                 }
1547         }
1548
1549         /*
1550          * The host name does not map to the original host address. Perhaps
1551          * someone has compromised a name server. More likely someone botched
1552          * it, but that could be dangerous, too.
1553          */
1554
1555         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1556                 print_sockaddr_len(addr_buf,
1557                         sizeof(addr_buf),
1558                         pss,
1559                         len),
1560                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1561
1562         if (ailist) {
1563                 freeaddrinfo(ailist);
1564         }
1565         return false;
1566 }
1567
1568 /*******************************************************************
1569  Deal with the singleton cache.
1570 ******************************************************************/
1571
1572 struct name_addr_pair {
1573         struct sockaddr_storage ss;
1574         const char *name;
1575 };
1576
1577 /*******************************************************************
1578  Lookup a name/addr pair. Returns memory allocated from memcache.
1579 ******************************************************************/
1580
1581 static bool lookup_nc(struct name_addr_pair *nc)
1582 {
1583         DATA_BLOB tmp;
1584
1585         ZERO_STRUCTP(nc);
1586
1587         if (!memcache_lookup(
1588                         NULL, SINGLETON_CACHE,
1589                         data_blob_string_const_null("get_peer_name"),
1590                         &tmp)) {
1591                 return false;
1592         }
1593
1594         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1595         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1596         return true;
1597 }
1598
1599 /*******************************************************************
1600  Save a name/addr pair.
1601 ******************************************************************/
1602
1603 static void store_nc(const struct name_addr_pair *nc)
1604 {
1605         DATA_BLOB tmp;
1606         size_t namelen = strlen(nc->name);
1607
1608         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1609         if (!tmp.data) {
1610                 return;
1611         }
1612         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1613         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1614
1615         memcache_add(NULL, SINGLETON_CACHE,
1616                         data_blob_string_const_null("get_peer_name"),
1617                         tmp);
1618         data_blob_free(&tmp);
1619 }
1620
1621 /*******************************************************************
1622  Return the DNS name of the remote end of a socket.
1623 ******************************************************************/
1624
1625 const char *get_peer_name(int fd, bool force_lookup)
1626 {
1627         struct name_addr_pair nc;
1628         char addr_buf[INET6_ADDRSTRLEN];
1629         struct sockaddr_storage ss;
1630         socklen_t length = sizeof(ss);
1631         const char *p;
1632         int ret;
1633         char name_buf[MAX_DNS_NAME_LENGTH];
1634         char tmp_name[MAX_DNS_NAME_LENGTH];
1635
1636         /* reverse lookups can be *very* expensive, and in many
1637            situations won't work because many networks don't link dhcp
1638            with dns. To avoid the delay we avoid the lookup if
1639            possible */
1640         if (!lp_hostname_lookups() && (force_lookup == false)) {
1641                 length = sizeof(nc.ss);
1642                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1643                         (struct sockaddr *)&nc.ss, &length);
1644                 store_nc(&nc);
1645                 lookup_nc(&nc);
1646                 return nc.name ? nc.name : "UNKNOWN";
1647         }
1648
1649         lookup_nc(&nc);
1650
1651         memset(&ss, '\0', sizeof(ss));
1652         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1653
1654         /* it might be the same as the last one - save some DNS work */
1655         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1656                 return nc.name ? nc.name : "UNKNOWN";
1657         }
1658
1659         /* Not the same. We need to lookup. */
1660         if (fd == -1) {
1661                 return "UNKNOWN";
1662         }
1663
1664         /* Look up the remote host name. */
1665         ret = sys_getnameinfo((struct sockaddr *)&ss,
1666                         length,
1667                         name_buf,
1668                         sizeof(name_buf),
1669                         NULL,
1670                         0,
1671                         0);
1672
1673         if (ret) {
1674                 DEBUG(1,("get_peer_name: getnameinfo failed "
1675                         "for %s with error %s\n",
1676                         p,
1677                         gai_strerror(ret)));
1678                 strlcpy(name_buf, p, sizeof(name_buf));
1679         } else {
1680                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1681                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1682                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1683                 }
1684         }
1685
1686         /* can't pass the same source and dest strings in when you
1687            use --enable-developer or the clobber_region() call will
1688            get you */
1689
1690         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1691         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1692         if (strstr(name_buf,"..")) {
1693                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1694         }
1695
1696         nc.name = name_buf;
1697         nc.ss = ss;
1698
1699         store_nc(&nc);
1700         lookup_nc(&nc);
1701         return nc.name ? nc.name : "UNKNOWN";
1702 }
1703
1704 /*******************************************************************
1705  Return the IP addr of the remote end of a socket as a string.
1706  ******************************************************************/
1707
1708 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1709 {
1710         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1711 }
1712
1713 /*******************************************************************
1714  Create protected unix domain socket.
1715
1716  Some unixes cannot set permissions on a ux-dom-sock, so we
1717  have to make sure that the directory contains the protection
1718  permissions instead.
1719  ******************************************************************/
1720
1721 int create_pipe_sock(const char *socket_dir,
1722                      const char *socket_name,
1723                      mode_t dir_perms)
1724 {
1725 #ifdef HAVE_UNIXSOCKET
1726         struct sockaddr_un sunaddr;
1727         struct stat st;
1728         int sock;
1729         mode_t old_umask;
1730         char *path = NULL;
1731
1732         old_umask = umask(0);
1733
1734         /* Create the socket directory or reuse the existing one */
1735
1736         if (lstat(socket_dir, &st) == -1) {
1737                 if (errno == ENOENT) {
1738                         /* Create directory */
1739                         if (mkdir(socket_dir, dir_perms) == -1) {
1740                                 DEBUG(0, ("error creating socket directory "
1741                                         "%s: %s\n", socket_dir,
1742                                         strerror(errno)));
1743                                 goto out_umask;
1744                         }
1745                 } else {
1746                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1747                                 socket_dir, strerror(errno)));
1748                         goto out_umask;
1749                 }
1750         } else {
1751                 /* Check ownership and permission on existing directory */
1752                 if (!S_ISDIR(st.st_mode)) {
1753                         DEBUG(0, ("socket directory %s isn't a directory\n",
1754                                 socket_dir));
1755                         goto out_umask;
1756                 }
1757                 if ((st.st_uid != sec_initial_uid()) ||
1758                                 ((st.st_mode & 0777) != dir_perms)) {
1759                         DEBUG(0, ("invalid permissions on socket directory "
1760                                 "%s\n", socket_dir));
1761                         goto out_umask;
1762                 }
1763         }
1764
1765         /* Create the socket file */
1766
1767         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1768
1769         if (sock == -1) {
1770                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1771                         strerror(errno) ));
1772                 goto out_close;
1773         }
1774
1775         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1776                 goto out_close;
1777         }
1778
1779         unlink(path);
1780         memset(&sunaddr, 0, sizeof(sunaddr));
1781         sunaddr.sun_family = AF_UNIX;
1782         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1783
1784         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1785                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1786                         strerror(errno)));
1787                 goto out_close;
1788         }
1789
1790         if (listen(sock, 5) == -1) {
1791                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1792                         strerror(errno)));
1793                 goto out_close;
1794         }
1795
1796         SAFE_FREE(path);
1797
1798         umask(old_umask);
1799         return sock;
1800
1801 out_close:
1802         SAFE_FREE(path);
1803         if (sock != -1)
1804                 close(sock);
1805
1806 out_umask:
1807         umask(old_umask);
1808         return -1;
1809
1810 #else
1811         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1812         return -1;
1813 #endif /* HAVE_UNIXSOCKET */
1814 }
1815
1816 /****************************************************************************
1817  Get my own canonical name, including domain.
1818 ****************************************************************************/
1819
1820 const char *get_mydnsfullname(void)
1821 {
1822         struct addrinfo *res = NULL;
1823         char my_hostname[HOST_NAME_MAX];
1824         bool ret;
1825         DATA_BLOB tmp;
1826
1827         if (memcache_lookup(NULL, SINGLETON_CACHE,
1828                         data_blob_string_const_null("get_mydnsfullname"),
1829                         &tmp)) {
1830                 SMB_ASSERT(tmp.length > 0);
1831                 return (const char *)tmp.data;
1832         }
1833
1834         /* get my host name */
1835         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1836                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1837                 return NULL;
1838         }
1839
1840         /* Ensure null termination. */
1841         my_hostname[sizeof(my_hostname)-1] = '\0';
1842
1843         ret = interpret_string_addr_internal(&res,
1844                                 my_hostname,
1845                                 AI_ADDRCONFIG|AI_CANONNAME);
1846
1847         if (!ret || res == NULL) {
1848                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1849                         "name %s [%s]\n",
1850                         my_hostname,
1851                         gai_strerror(ret) ));
1852                 return NULL;
1853         }
1854
1855         /*
1856          * Make sure that getaddrinfo() returns the "correct" host name.
1857          */
1858
1859         if (res->ai_canonname == NULL) {
1860                 DEBUG(3,("get_mydnsfullname: failed to get "
1861                         "canonical name for %s\n",
1862                         my_hostname));
1863                 freeaddrinfo(res);
1864                 return NULL;
1865         }
1866
1867         /* This copies the data, so we must do a lookup
1868          * afterwards to find the value to return.
1869          */
1870
1871         memcache_add(NULL, SINGLETON_CACHE,
1872                         data_blob_string_const_null("get_mydnsfullname"),
1873                         data_blob_string_const_null(res->ai_canonname));
1874
1875         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1876                         data_blob_string_const_null("get_mydnsfullname"),
1877                         &tmp)) {
1878                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1879                                 strlen(res->ai_canonname) + 1);
1880         }
1881
1882         freeaddrinfo(res);
1883
1884         return (const char *)tmp.data;
1885 }
1886
1887 /************************************************************
1888  Is this my name ?
1889 ************************************************************/
1890
1891 bool is_myname_or_ipaddr(const char *s)
1892 {
1893         TALLOC_CTX *ctx = talloc_tos();
1894         char addr[INET6_ADDRSTRLEN];
1895         char *name = NULL;
1896         const char *dnsname;
1897         char *servername = NULL;
1898
1899         if (!s) {
1900                 return false;
1901         }
1902
1903         /* Santize the string from '\\name' */
1904         name = talloc_strdup(ctx, s);
1905         if (!name) {
1906                 return false;
1907         }
1908
1909         servername = strrchr_m(name, '\\' );
1910         if (!servername) {
1911                 servername = name;
1912         } else {
1913                 servername++;
1914         }
1915
1916         /* Optimize for the common case */
1917         if (strequal(servername, global_myname())) {
1918                 return true;
1919         }
1920
1921         /* Check for an alias */
1922         if (is_myname(servername)) {
1923                 return true;
1924         }
1925
1926         /* Check for loopback */
1927         if (strequal(servername, "127.0.0.1") ||
1928                         strequal(servername, "::1")) {
1929                 return true;
1930         }
1931
1932         if (strequal(servername, "localhost")) {
1933                 return true;
1934         }
1935
1936         /* Maybe it's my dns name */
1937         dnsname = get_mydnsfullname();
1938         if (dnsname && strequal(servername, dnsname)) {
1939                 return true;
1940         }
1941
1942         /* Handle possible CNAME records - convert to an IP addr. */
1943         if (!is_ipaddress(servername)) {
1944                 /* Use DNS to resolve the name, but only the first address */
1945                 struct sockaddr_storage ss;
1946                 if (interpret_string_addr(&ss, servername, 0)) {
1947                         print_sockaddr(addr,
1948                                         sizeof(addr),
1949                                         &ss);
1950                         servername = addr;
1951                 }
1952         }
1953
1954         /* Maybe its an IP address? */
1955         if (is_ipaddress(servername)) {
1956                 struct sockaddr_storage ss;
1957                 struct iface_struct *nics;
1958                 int i, n;
1959
1960                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1961                         return false;
1962                 }
1963
1964                 if (ismyaddr((struct sockaddr *)&ss)) {
1965                         return true;
1966                 }
1967
1968                 if (is_zero_addr((struct sockaddr *)&ss) ||
1969                         is_loopback_addr((struct sockaddr *)&ss)) {
1970                         return false;
1971                 }
1972
1973                 n = get_interfaces(talloc_tos(), &nics);
1974                 for (i=0; i<n; i++) {
1975                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1976                                 TALLOC_FREE(nics);
1977                                 return true;
1978                         }
1979                 }
1980                 TALLOC_FREE(nics);
1981         }
1982
1983         /* No match */
1984         return false;
1985 }
1986
1987 struct getaddrinfo_state {
1988         const char *node;
1989         const char *service;
1990         const struct addrinfo *hints;
1991         struct addrinfo *res;
1992         int ret;
1993 };
1994
1995 static void getaddrinfo_do(void *private_data);
1996 static void getaddrinfo_done(struct tevent_req *subreq);
1997
1998 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1999                                     struct tevent_context *ev,
2000                                     struct fncall_context *ctx,
2001                                     const char *node,
2002                                     const char *service,
2003                                     const struct addrinfo *hints)
2004 {
2005         struct tevent_req *req, *subreq;
2006         struct getaddrinfo_state *state;
2007
2008         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
2009         if (req == NULL) {
2010                 return NULL;
2011         }
2012
2013         state->node = node;
2014         state->service = service;
2015         state->hints = hints;
2016
2017         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
2018         if (tevent_req_nomem(subreq, req)) {
2019                 return tevent_req_post(req, ev);
2020         }
2021         tevent_req_set_callback(subreq, getaddrinfo_done, req);
2022         return req;
2023 }
2024
2025 static void getaddrinfo_do(void *private_data)
2026 {
2027         struct getaddrinfo_state *state =
2028                 (struct getaddrinfo_state *)private_data;
2029
2030         state->ret = getaddrinfo(state->node, state->service, state->hints,
2031                                  &state->res);
2032 }
2033
2034 static void getaddrinfo_done(struct tevent_req *subreq)
2035 {
2036         struct tevent_req *req = tevent_req_callback_data(
2037                 subreq, struct tevent_req);
2038         int ret, err;
2039
2040         ret = fncall_recv(subreq, &err);
2041         TALLOC_FREE(subreq);
2042         if (ret == -1) {
2043                 tevent_req_error(req, err);
2044                 return;
2045         }
2046         tevent_req_done(req);
2047 }
2048
2049 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
2050 {
2051         struct getaddrinfo_state *state = tevent_req_data(
2052                 req, struct getaddrinfo_state);
2053         int err;
2054
2055         if (tevent_req_is_unix_error(req, &err)) {
2056                 switch(err) {
2057                 case ENOMEM:
2058                         return EAI_MEMORY;
2059                 default:
2060                         return EAI_FAIL;
2061                 }
2062         }
2063         if (state->ret == 0) {
2064                 *res = state->res;
2065         }
2066         return state->ret;
2067 }