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 file descriptor 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  NB. This can be called with a non-socket fd, don't change
 498  sys_read() to sys_recv() or other socket call.
 499 ****************************************************************************/
 500
 501 NTSTATUS read_fd_with_timeout(int fd, char *buf,
 502                                   size_t mincnt, size_t maxcnt,
 503                                   unsigned int time_out,
 504                                   size_t *size_ret)
 505 {
 506         fd_set fds;
 507         int selrtn;
 508         ssize_t readret;
 509         size_t nread = 0;
 510         struct timeval timeout;
 511         char addr[INET6_ADDRSTRLEN];
 512
 513         /* just checking .... */
 514         if (maxcnt <= 0)
 515                 return NT_STATUS_OK;
 516
 517         /* Blocking read */
 518         if (time_out == 0) {
 519                 if (mincnt == 0) {
 520                         mincnt = maxcnt;
 521                 }
 522
 523                 while (nread < mincnt) {
 524                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 525
 526                         if (readret == 0) {
 527                                 DEBUG(5,("read_fd_with_timeout: "
 528                                         "blocking read. EOF from client.\n"));
 529                                 return NT_STATUS_END_OF_FILE;
 530                         }
 531
 532                         if (readret == -1) {
 533                                 if (fd == get_client_fd()) {
 534                                         /* Try and give an error message
 535                                          * saying what client failed. */
 536                                         DEBUG(0,("read_fd_with_timeout: "
 537                                                 "client %s read error = %s.\n",
 538                                                 get_peer_addr(fd,addr,sizeof(addr)),
 539                                                 strerror(errno) ));
 540                                 } else {
 541                                         DEBUG(0,("read_fd_with_timeout: "
 542                                                 "read error = %s.\n",
 543                                                 strerror(errno) ));
 544                                 }
 545                                 return map_nt_error_from_unix(errno);
 546                         }
 547                         nread += readret;
 548                 }
 549                 goto done;
 550         }
 551
 552         /* Most difficult - timeout read */
 553         /* If this is ever called on a disk file and
 554            mincnt is greater then the filesize then
 555            system performance will suffer severely as
 556            select always returns true on disk files */
 557
 558         /* Set initial timeout */
 559         timeout.tv_sec = (time_t)(time_out / 1000);
 560         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 561
 562         for (nread=0; nread < mincnt; ) {
 563                 FD_ZERO(&fds);
 564                 FD_SET(fd,&fds);
 565
 566                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 567
 568                 /* Check if error */
 569                 if (selrtn == -1) {
 570                         /* something is wrong. Maybe the socket is dead? */
 571                         if (fd == get_client_fd()) {
 572                                 /* Try and give an error message saying
 573                                  * what client failed. */
 574                                 DEBUG(0,("read_fd_with_timeout: timeout "
 575                                 "read for client %s. select error = %s.\n",
 576                                 get_peer_addr(fd,addr,sizeof(addr)),
 577                                 strerror(errno) ));
 578                         } else {
 579                                 DEBUG(0,("read_fd_with_timeout: timeout "
 580                                 "read. select error = %s.\n",
 581                                 strerror(errno) ));
 582                         }
 583                         return map_nt_error_from_unix(errno);
 584                 }
 585
 586                 /* Did we timeout ? */
 587                 if (selrtn == 0) {
 588                         DEBUG(10,("read_fd_with_timeout: timeout read. "
 589                                 "select timed out.\n"));
 590                         return NT_STATUS_IO_TIMEOUT;
 591                 }
 592
 593                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 594
 595                 if (readret == 0) {
 596                         /* we got EOF on the file descriptor */
 597                         DEBUG(5,("read_fd_with_timeout: timeout read. "
 598                                 "EOF from client.\n"));
 599                         return NT_STATUS_END_OF_FILE;
 600                 }
 601
 602                 if (readret == -1) {
 603                         /* the descriptor is probably dead */
 604                         if (fd == get_client_fd()) {
 605                                 /* Try and give an error message
 606                                  * saying what client failed. */
 607                                 DEBUG(0,("read_fd_with_timeout: timeout "
 608                                         "read to client %s. read error = %s.\n",
 609                                         get_peer_addr(fd,addr,sizeof(addr)),
 610                                         strerror(errno) ));
 611                         } else {
 612                                 DEBUG(0,("read_fd_with_timeout: timeout "
 613                                         "read. read error = %s.\n",
 614                                         strerror(errno) ));
 615                         }
 616                         return map_nt_error_from_unix(errno);
 617                 }
 618
 619                 nread += readret;
 620         }
 621
 622  done:
 623         /* Return the number we got */
 624         if (size_ret) {
 625                 *size_ret = nread;
 626         }
 627         return NT_STATUS_OK;
 628 }
 629
 630 /****************************************************************************
 631  Read data from an fd, reading exactly N bytes.
 632  NB. This can be called with a non-socket fd, don't add dependencies
 633  on socket calls.
 634 ****************************************************************************/
 635
 636 NTSTATUS read_data(int fd, char *buffer, size_t N)
 637 {
 638         return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
 639 }
 640
 641 /****************************************************************************
 642  Write all data from an iov array
 643  NB. This can be called with a non-socket fd, don't add dependencies
 644  on socket calls.
 645 ****************************************************************************/
 646
 647 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 648 {
 649         int i;
 650         size_t to_send;
 651         ssize_t thistime;
 652         size_t sent;
 653         struct iovec *iov_copy, *iov;
 654
 655         to_send = 0;
 656         for (i=0; i<iovcnt; i++) {
 657                 to_send += orig_iov[i].iov_len;
 658         }
 659
 660         thistime = sys_writev(fd, orig_iov, iovcnt);
 661         if ((thistime <= 0) || (thistime == to_send)) {
 662                 return thistime;
 663         }
 664         sent = thistime;
 665
 666         /*
 667          * We could not send everything in one call. Make a copy of iov that
 668          * we can mess with. We keep a copy of the array start in iov_copy for
 669          * the TALLOC_FREE, because we're going to modify iov later on,
 670          * discarding elements.
 671          */
 672
 673         iov_copy = (struct iovec *)TALLOC_MEMDUP(
 674                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 675
 676         if (iov_copy == NULL) {
 677                 errno = ENOMEM;
 678                 return -1;
 679         }
 680         iov = iov_copy;
 681
 682         while (sent < to_send) {
 683                 /*
 684                  * We have to discard "thistime" bytes from the beginning
 685                  * iov array, "thistime" contains the number of bytes sent
 686                  * via writev last.
 687                  */
 688                 while (thistime > 0) {
 689                         if (thistime < iov[0].iov_len) {
 690                                 char *new_base =
 691                                         (char *)iov[0].iov_base + thistime;
 692                                 iov[0].iov_base = new_base;
 693                                 iov[0].iov_len -= thistime;
 694                                 break;
 695                         }
 696                         thistime -= iov[0].iov_len;
 697                         iov += 1;
 698                         iovcnt -= 1;
 699                 }
 700
 701                 thistime = sys_writev(fd, iov, iovcnt);
 702                 if (thistime <= 0) {
 703                         break;
 704                 }
 705                 sent += thistime;
 706         }
 707
 708         TALLOC_FREE(iov_copy);
 709         return sent;
 710 }
 711
 712 /****************************************************************************
 713  Write data to a fd.
 714  NB. This can be called with a non-socket fd, don't add dependencies
 715  on socket calls.
 716 ****************************************************************************/
 717
 718 ssize_t write_data(int fd, const char *buffer, size_t N)
 719 {
 720         ssize_t ret;
 721         struct iovec iov;
 722
 723         iov.iov_base = CONST_DISCARD(char *, buffer);
 724         iov.iov_len = N;
 725
 726         ret = write_data_iov(fd, &iov, 1);
 727         if (ret >= 0) {
 728                 return ret;
 729         }
 730
 731         if (fd == get_client_fd()) {
 732                 char addr[INET6_ADDRSTRLEN];
 733                 /*
 734                  * Try and give an error message saying what client failed.
 735                  */
 736                 DEBUG(0, ("write_data: write failure in writing to client %s. "
 737                           "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
 738                           strerror(errno)));
 739         } else {
 740                 DEBUG(0,("write_data: write failure. Error = %s\n",
 741                          strerror(errno) ));
 742         }
 743
 744         return -1;
 745 }
 746
 747 /****************************************************************************
 748  Send a keepalive packet (rfc1002).
 749 ****************************************************************************/
 750
 751 bool send_keepalive(int client)
 752 {
 753         unsigned char buf[4];
 754
 755         buf[0] = SMBkeepalive;
 756         buf[1] = buf[2] = buf[3] = 0;
 757
 758         return(write_data(client,(char *)buf,4) == 4);
 759 }
 760
 761 /****************************************************************************
 762  Read 4 bytes of a smb packet and return the smb length of the packet.
 763  Store the result in the buffer.
 764  This version of the function will return a length of zero on receiving
 765  a keepalive packet.
 766  Timeout is in milliseconds.
 767 ****************************************************************************/
 768
 769 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 770                                           unsigned int timeout,
 771                                           size_t *len)
 772 {
 773         int msg_type;
 774         NTSTATUS status;
 775
 776         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 777
 778         if (!NT_STATUS_IS_OK(status)) {
 779                 return status;
 780         }
 781
 782         *len = smb_len(inbuf);
 783         msg_type = CVAL(inbuf,0);
 784
 785         if (msg_type == SMBkeepalive) {
 786                 DEBUG(5,("Got keepalive packet\n"));
 787         }
 788
 789         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 790
 791         return NT_STATUS_OK;
 792 }
 793
 794 /****************************************************************************
 795  Read 4 bytes of a smb packet and return the smb length of the packet.
 796  Store the result in the buffer. This version of the function will
 797  never return a session keepalive (length of zero).
 798  Timeout is in milliseconds.
 799 ****************************************************************************/
 800
 801 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
 802                          size_t *len)
 803 {
 804         uint8_t msgtype = SMBkeepalive;
 805
 806         while (msgtype == SMBkeepalive) {
 807                 NTSTATUS status;
 808
 809                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
 810                                                           len);
 811                 if (!NT_STATUS_IS_OK(status)) {
 812                         return status;
 813                 }
 814
 815                 msgtype = CVAL(inbuf, 0);
 816         }
 817
 818         DEBUG(10,("read_smb_length: got smb length of %lu\n",
 819                   (unsigned long)len));
 820
 821         return NT_STATUS_OK;
 822 }
 823
 824 /****************************************************************************
 825  Read an smb from a fd.
 826  The timeout is in milliseconds.
 827  This function will return on receipt of a session keepalive packet.
 828  maxlen is the max number of bytes to return, not including the 4 byte
 829  length. If zero it means buflen limit.
 830  Doesn't check the MAC on signed packets.
 831 ****************************************************************************/
 832
 833 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 834                          size_t maxlen, size_t *p_len)
 835 {
 836         size_t len;
 837         NTSTATUS status;
 838
 839         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 840
 841         if (!NT_STATUS_IS_OK(status)) {
 842                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
 843                 return status;
 844         }
 845
 846         if (len > buflen) {
 847                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 848                                         (unsigned long)len));
 849                 return NT_STATUS_INVALID_PARAMETER;
 850         }
 851
 852         if(len > 0) {
 853                 if (maxlen) {
 854                         len = MIN(len,maxlen);
 855                 }
 856
 857                 status = read_fd_with_timeout(
 858                         fd, buffer+4, len, len, timeout, &len);
 859
 860                 if (!NT_STATUS_IS_OK(status)) {
 861                         return status;
 862                 }
 863
 864                 /* not all of samba3 properly checks for packet-termination
 865                  * of strings. This ensures that we don't run off into
 866                  * empty space. */
 867                 SSVAL(buffer+4,len, 0);
 868         }
 869
 870         *p_len = len;
 871         return NT_STATUS_OK;
 872 }
 873
 874 /****************************************************************************
 875  Open a socket of the specified type, port, and address for incoming data.
 876 ****************************************************************************/
 877
 878 int open_socket_in(int type,
 879                 uint16_t port,
 880                 int dlevel,
 881                 const struct sockaddr_storage *psock,
 882                 bool rebind)
 883 {
 884         struct sockaddr_storage sock;
 885         int res;
 886         socklen_t slen = sizeof(struct sockaddr_in);
 887
 888         sock = *psock;
 889
 890 #if defined(HAVE_IPV6)
 891         if (sock.ss_family == AF_INET6) {
 892                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 893                 slen = sizeof(struct sockaddr_in6);
 894         }
 895 #endif
 896         if (sock.ss_family == AF_INET) {
 897                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 898         }
 899
 900         res = socket(sock.ss_family, type, 0 );
 901         if( res == -1 ) {
 902                 if( DEBUGLVL(0) ) {
 903                         dbgtext( "open_socket_in(): socket() call failed: " );
 904                         dbgtext( "%s\n", strerror( errno ) );
 905                 }
 906                 return -1;
 907         }
 908
 909         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 910         {
 911                 int val = rebind ? 1 : 0;
 912                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 913                                         (char *)&val,sizeof(val)) == -1 ) {
 914                         if( DEBUGLVL( dlevel ) ) {
 915                                 dbgtext( "open_socket_in(): setsockopt: " );
 916                                 dbgtext( "SO_REUSEADDR = %s ",
 917                                                 val?"true":"false" );
 918                                 dbgtext( "on port %d failed ", port );
 919                                 dbgtext( "with error = %s\n", strerror(errno) );
 920                         }
 921                 }
 922 #ifdef SO_REUSEPORT
 923                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 924                                         (char *)&val,sizeof(val)) == -1 ) {
 925                         if( DEBUGLVL( dlevel ) ) {
 926                                 dbgtext( "open_socket_in(): setsockopt: ");
 927                                 dbgtext( "SO_REUSEPORT = %s ",
 928                                                 val?"true":"false");
 929                                 dbgtext( "on port %d failed ", port);
 930                                 dbgtext( "with error = %s\n", strerror(errno));
 931                         }
 932                 }
 933 #endif /* SO_REUSEPORT */
 934         }
 935
 936         /* now we've got a socket - we need to bind it */
 937         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 938                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 939                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 940                         char addr[INET6_ADDRSTRLEN];
 941                         print_sockaddr(addr, sizeof(addr),
 942                                         &sock);
 943                         dbgtext( "bind failed on port %d ", port);
 944                         dbgtext( "socket_addr = %s.\n", addr);
 945                         dbgtext( "Error = %s\n", strerror(errno));
 946                 }
 947                 close(res);
 948                 return -1;
 949         }
 950
 951         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 952         return( res );
 953  }
 954
 955 struct open_socket_out_state {
 956         int fd;
 957         struct event_context *ev;
 958         struct sockaddr_storage ss;
 959         socklen_t salen;
 960         uint16_t port;
 961         int wait_nsec;
 962 };
 963
 964 static void open_socket_out_connected(struct tevent_req *subreq);
 965
 966 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 967 {
 968         if (s->fd != -1) {
 969                 close(s->fd);
 970         }
 971         return 0;
 972 }
 973
 974 /****************************************************************************
 975  Create an outgoing socket. timeout is in milliseconds.
 976 **************************************************************************/
 977
 978 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 979                                         struct event_context *ev,
 980                                         const struct sockaddr_storage *pss,
 981                                         uint16_t port,
 982                                         int timeout)
 983 {
 984         char addr[INET6_ADDRSTRLEN];
 985         struct tevent_req *result, *subreq;
 986         struct open_socket_out_state *state;
 987         NTSTATUS status;
 988
 989         result = tevent_req_create(mem_ctx, &state,
 990                                    struct open_socket_out_state);
 991         if (result == NULL) {
 992                 return NULL;
 993         }
 994         state->ev = ev;
 995         state->ss = *pss;
 996         state->port = port;
 997         state->wait_nsec = 10000;
 998         state->salen = -1;
 999
1000         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
1001         if (state->fd == -1) {
1002                 status = map_nt_error_from_unix(errno);
1003                 goto post_status;
1004         }
1005         talloc_set_destructor(state, open_socket_out_state_destructor);
1006
1007         if (!tevent_req_set_endtime(
1008                     result, ev, timeval_current_ofs(0, timeout*1000))) {
1009                 goto fail;
1010         }
1011
1012 #if defined(HAVE_IPV6)
1013         if (pss->ss_family == AF_INET6) {
1014                 struct sockaddr_in6 *psa6;
1015                 psa6 = (struct sockaddr_in6 *)&state->ss;
1016                 psa6->sin6_port = htons(port);
1017                 if (psa6->sin6_scope_id == 0
1018                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1019                         setup_linklocal_scope_id(
1020                                 (struct sockaddr *)&(state->ss));
1021                 }
1022                 state->salen = sizeof(struct sockaddr_in6);
1023         }
1024 #endif
1025         if (pss->ss_family == AF_INET) {
1026                 struct sockaddr_in *psa;
1027                 psa = (struct sockaddr_in *)&state->ss;
1028                 psa->sin_port = htons(port);
1029                 state->salen = sizeof(struct sockaddr_in);
1030         }
1031
1032         print_sockaddr(addr, sizeof(addr), &state->ss);
1033         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1034
1035         subreq = async_connect_send(state, state->ev, state->fd,
1036                                     (struct sockaddr *)&state->ss,
1037                                     state->salen);
1038         if ((subreq == NULL)
1039             || !tevent_req_set_endtime(
1040                     subreq, state->ev,
1041                     timeval_current_ofs(0, state->wait_nsec))) {
1042                 goto fail;
1043         }
1044         tevent_req_set_callback(subreq, open_socket_out_connected, result);
1045         return result;
1046
1047  post_status:
1048         tevent_req_nterror(result, status);
1049         return tevent_req_post(result, ev);
1050  fail:
1051         TALLOC_FREE(result);
1052         return NULL;
1053 }
1054
1055 static void open_socket_out_connected(struct tevent_req *subreq)
1056 {
1057         struct tevent_req *req =
1058                 tevent_req_callback_data(subreq, struct tevent_req);
1059         struct open_socket_out_state *state =
1060                 tevent_req_data(req, struct open_socket_out_state);
1061         int ret;
1062         int sys_errno;
1063
1064         ret = async_connect_recv(subreq, &sys_errno);
1065         TALLOC_FREE(subreq);
1066         if (ret == 0) {
1067                 tevent_req_done(req);
1068                 return;
1069         }
1070
1071         if (
1072 #ifdef ETIMEDOUT
1073                 (sys_errno == ETIMEDOUT) ||
1074 #endif
1075                 (sys_errno == EINPROGRESS) ||
1076                 (sys_errno == EALREADY) ||
1077                 (sys_errno == EAGAIN)) {
1078
1079                 /*
1080                  * retry
1081                  */
1082
1083                 if (state->wait_nsec < 250000) {
1084                         state->wait_nsec *= 1.5;
1085                 }
1086
1087                 subreq = async_connect_send(state, state->ev, state->fd,
1088                                             (struct sockaddr *)&state->ss,
1089                                             state->salen);
1090                 if (tevent_req_nomem(subreq, req)) {
1091                         return;
1092                 }
1093                 if (!tevent_req_set_endtime(
1094                             subreq, state->ev,
1095                             timeval_current_ofs(0, state->wait_nsec))) {
1096                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1097                         return;
1098                 }
1099                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1100                 return;
1101         }
1102
1103 #ifdef EISCONN
1104         if (sys_errno == EISCONN) {
1105                 tevent_req_done(req);
1106                 return;
1107         }
1108 #endif
1109
1110         /* real error */
1111         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1112 }
1113
1114 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1115 {
1116         struct open_socket_out_state *state =
1117                 tevent_req_data(req, struct open_socket_out_state);
1118         NTSTATUS status;
1119
1120         if (tevent_req_is_nterror(req, &status)) {
1121                 return status;
1122         }
1123         *pfd = state->fd;
1124         state->fd = -1;
1125         return NT_STATUS_OK;
1126 }
1127
1128 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1129                          int timeout, int *pfd)
1130 {
1131         TALLOC_CTX *frame = talloc_stackframe();
1132         struct event_context *ev;
1133         struct tevent_req *req;
1134         NTSTATUS status = NT_STATUS_NO_MEMORY;
1135
1136         ev = event_context_init(frame);
1137         if (ev == NULL) {
1138                 goto fail;
1139         }
1140
1141         req = open_socket_out_send(frame, ev, pss, port, timeout);
1142         if (req == NULL) {
1143                 goto fail;
1144         }
1145         if (!tevent_req_poll(req, ev)) {
1146                 status = NT_STATUS_INTERNAL_ERROR;
1147                 goto fail;
1148         }
1149         status = open_socket_out_recv(req, pfd);
1150  fail:
1151         TALLOC_FREE(frame);
1152         return status;
1153 }
1154
1155 struct open_socket_out_defer_state {
1156         struct event_context *ev;
1157         struct sockaddr_storage ss;
1158         uint16_t port;
1159         int timeout;
1160         int fd;
1161 };
1162
1163 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1164 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1165
1166 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1167                                               struct event_context *ev,
1168                                               struct timeval wait_time,
1169                                               const struct sockaddr_storage *pss,
1170                                               uint16_t port,
1171                                               int timeout)
1172 {
1173         struct tevent_req *req, *subreq;
1174         struct open_socket_out_defer_state *state;
1175
1176         req = tevent_req_create(mem_ctx, &state,
1177                                 struct open_socket_out_defer_state);
1178         if (req == NULL) {
1179                 return NULL;
1180         }
1181         state->ev = ev;
1182         state->ss = *pss;
1183         state->port = port;
1184         state->timeout = timeout;
1185
1186         subreq = tevent_wakeup_send(
1187                 state, ev,
1188                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1189         if (subreq == NULL) {
1190                 goto fail;
1191         }
1192         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1193         return req;
1194  fail:
1195         TALLOC_FREE(req);
1196         return NULL;
1197 }
1198
1199 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1200 {
1201         struct tevent_req *req = tevent_req_callback_data(
1202                 subreq, struct tevent_req);
1203         struct open_socket_out_defer_state *state = tevent_req_data(
1204                 req, struct open_socket_out_defer_state);
1205         bool ret;
1206
1207         ret = tevent_wakeup_recv(subreq);
1208         TALLOC_FREE(subreq);
1209         if (!ret) {
1210                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1211                 return;
1212         }
1213
1214         subreq = open_socket_out_send(state, state->ev, &state->ss,
1215                                       state->port, state->timeout);
1216         if (tevent_req_nomem(subreq, req)) {
1217                 return;
1218         }
1219         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1220 }
1221
1222 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1223 {
1224         struct tevent_req *req = tevent_req_callback_data(
1225                 subreq, struct tevent_req);
1226         struct open_socket_out_defer_state *state = tevent_req_data(
1227                 req, struct open_socket_out_defer_state);
1228         NTSTATUS status;
1229
1230         status = open_socket_out_recv(subreq, &state->fd);
1231         TALLOC_FREE(subreq);
1232         if (!NT_STATUS_IS_OK(status)) {
1233                 tevent_req_nterror(req, status);
1234                 return;
1235         }
1236         tevent_req_done(req);
1237 }
1238
1239 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1240 {
1241         struct open_socket_out_defer_state *state = tevent_req_data(
1242                 req, struct open_socket_out_defer_state);
1243         NTSTATUS status;
1244
1245         if (tevent_req_is_nterror(req, &status)) {
1246                 return status;
1247         }
1248         *pfd = state->fd;
1249         state->fd = -1;
1250         return NT_STATUS_OK;
1251 }
1252
1253 /*******************************************************************
1254  Create an outgoing TCP socket to the first addr that connects.
1255
1256  This is for simultaneous connection attempts to port 445 and 139 of a host
1257  or for simultatneous connection attempts to multiple DCs at once.  We return
1258  a socket fd of the first successful connection.
1259
1260  @param[in] addrs list of Internet addresses and ports to connect to
1261  @param[in] num_addrs number of address/port pairs in the addrs list
1262  @param[in] timeout time after which we stop waiting for a socket connection
1263             to succeed, given in milliseconds
1264  @param[out] fd_index the entry in addrs which we successfully connected to
1265  @param[out] fd fd of the open and connected socket
1266  @return true on a successful connection, false if all connection attempts
1267          failed or we timed out
1268 *******************************************************************/
1269
1270 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1271                          int timeout, int *fd_index, int *fd)
1272 {
1273         int i, resulting_index, res;
1274         int *sockets;
1275         bool good_connect;
1276
1277         fd_set r_fds, wr_fds;
1278         struct timeval tv;
1279         int maxfd;
1280
1281         int connect_loop = 10000; /* 10 milliseconds */
1282
1283         timeout *= 1000;        /* convert to microseconds */
1284
1285         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1286
1287         if (sockets == NULL)
1288                 return false;
1289
1290         resulting_index = -1;
1291
1292         for (i=0; i<num_addrs; i++)
1293                 sockets[i] = -1;
1294
1295         for (i=0; i<num_addrs; i++) {
1296                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1297                 if (sockets[i] < 0)
1298                         goto done;
1299                 set_blocking(sockets[i], false);
1300         }
1301
1302  connect_again:
1303         good_connect = false;
1304
1305         for (i=0; i<num_addrs; i++) {
1306                 const struct sockaddr * a =
1307                     (const struct sockaddr *)&(addrs[i]);
1308
1309                 if (sockets[i] == -1)
1310                         continue;
1311
1312                 if (sys_connect(sockets[i], a) == 0) {
1313                         /* Rather unlikely as we are non-blocking, but it
1314                          * might actually happen. */
1315                         resulting_index = i;
1316                         goto done;
1317                 }
1318
1319                 if (errno == EINPROGRESS || errno == EALREADY ||
1320 #ifdef EISCONN
1321                         errno == EISCONN ||
1322 #endif
1323                     errno == EAGAIN || errno == EINTR) {
1324                         /* These are the error messages that something is
1325                            progressing. */
1326                         good_connect = true;
1327                 } else if (errno != 0) {
1328                         /* There was a direct error */
1329                         close(sockets[i]);
1330                         sockets[i] = -1;
1331                 }
1332         }
1333
1334         if (!good_connect) {
1335                 /* All of the connect's resulted in real error conditions */
1336                 goto done;
1337         }
1338
1339         /* Lets see if any of the connect attempts succeeded */
1340
1341         maxfd = 0;
1342         FD_ZERO(&wr_fds);
1343         FD_ZERO(&r_fds);
1344
1345         for (i=0; i<num_addrs; i++) {
1346                 if (sockets[i] == -1)
1347                         continue;
1348                 FD_SET(sockets[i], &wr_fds);
1349                 FD_SET(sockets[i], &r_fds);
1350                 if (sockets[i]>maxfd)
1351                         maxfd = sockets[i];
1352         }
1353
1354         tv.tv_sec = 0;
1355         tv.tv_usec = connect_loop;
1356
1357         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1358
1359         if (res < 0)
1360                 goto done;
1361
1362         if (res == 0)
1363                 goto next_round;
1364
1365         for (i=0; i<num_addrs; i++) {
1366
1367                 if (sockets[i] == -1)
1368                         continue;
1369
1370                 /* Stevens, Network Programming says that if there's a
1371                  * successful connect, the socket is only writable. Upon an
1372                  * error, it's both readable and writable. */
1373
1374                 if (FD_ISSET(sockets[i], &r_fds) &&
1375                     FD_ISSET(sockets[i], &wr_fds)) {
1376                         /* readable and writable, so it's an error */
1377                         close(sockets[i]);
1378                         sockets[i] = -1;
1379                         continue;
1380                 }
1381
1382                 if (!FD_ISSET(sockets[i], &r_fds) &&
1383                     FD_ISSET(sockets[i], &wr_fds)) {
1384                         /* Only writable, so it's connected */
1385                         resulting_index = i;
1386                         goto done;
1387                 }
1388         }
1389
1390  next_round:
1391
1392         timeout -= connect_loop;
1393         if (timeout <= 0)
1394                 goto done;
1395         connect_loop *= 1.5;
1396         if (connect_loop > timeout)
1397                 connect_loop = timeout;
1398         goto connect_again;
1399
1400  done:
1401         for (i=0; i<num_addrs; i++) {
1402                 if (i == resulting_index)
1403                         continue;
1404                 if (sockets[i] >= 0)
1405                         close(sockets[i]);
1406         }
1407
1408         if (resulting_index >= 0) {
1409                 *fd_index = resulting_index;
1410                 *fd = sockets[*fd_index];
1411                 set_blocking(*fd, true);
1412         }
1413
1414         free(sockets);
1415
1416         return (resulting_index >= 0);
1417 }
1418 /****************************************************************************
1419  Open a connected UDP socket to host on port
1420 **************************************************************************/
1421
1422 int open_udp_socket(const char *host, int port)
1423 {
1424         struct sockaddr_storage ss;
1425         int res;
1426
1427         if (!interpret_string_addr(&ss, host, 0)) {
1428                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1429                         host));
1430                 return -1;
1431         }
1432
1433         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1434         if (res == -1) {
1435                 return -1;
1436         }
1437
1438 #if defined(HAVE_IPV6)
1439         if (ss.ss_family == AF_INET6) {
1440                 struct sockaddr_in6 *psa6;
1441                 psa6 = (struct sockaddr_in6 *)&ss;
1442                 psa6->sin6_port = htons(port);
1443                 if (psa6->sin6_scope_id == 0
1444                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1445                         setup_linklocal_scope_id(
1446                                 (struct sockaddr *)&ss);
1447                 }
1448         }
1449 #endif
1450         if (ss.ss_family == AF_INET) {
1451                 struct sockaddr_in *psa;
1452                 psa = (struct sockaddr_in *)&ss;
1453                 psa->sin_port = htons(port);
1454         }
1455
1456         if (sys_connect(res,(struct sockaddr *)&ss)) {
1457                 close(res);
1458                 return -1;
1459         }
1460
1461         return res;
1462 }
1463
1464 /*******************************************************************
1465  Return the IP addr of the remote end of a socket as a string.
1466  Optionally return the struct sockaddr_storage.
1467  ******************************************************************/
1468
1469 static const char *get_peer_addr_internal(int fd,
1470                                 char *addr_buf,
1471                                 size_t addr_buf_len,
1472                                 struct sockaddr *pss,
1473                                 socklen_t *plength)
1474 {
1475         struct sockaddr_storage ss;
1476         socklen_t length = sizeof(ss);
1477
1478         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1479
1480         if (fd == -1) {
1481                 return addr_buf;
1482         }
1483
1484         if (pss == NULL) {
1485                 pss = (struct sockaddr *)&ss;
1486                 plength = &length;
1487         }
1488
1489         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1490                 DEBUG(0,("getpeername failed. Error was %s\n",
1491                                         strerror(errno) ));
1492                 return addr_buf;
1493         }
1494
1495         print_sockaddr_len(addr_buf,
1496                         addr_buf_len,
1497                         pss,
1498                         *plength);
1499         return addr_buf;
1500 }
1501
1502 /*******************************************************************
1503  Matchname - determine if host name matches IP address. Used to
1504  confirm a hostname lookup to prevent spoof attacks.
1505 ******************************************************************/
1506
1507 static bool matchname(const char *remotehost,
1508                 const struct sockaddr *pss,
1509                 socklen_t len)
1510 {
1511         struct addrinfo *res = NULL;
1512         struct addrinfo *ailist = NULL;
1513         char addr_buf[INET6_ADDRSTRLEN];
1514         bool ret = interpret_string_addr_internal(&ailist,
1515                         remotehost,
1516                         AI_ADDRCONFIG|AI_CANONNAME);
1517
1518         if (!ret || ailist == NULL) {
1519                 DEBUG(3,("matchname: getaddrinfo failed for "
1520                         "name %s [%s]\n",
1521                         remotehost,
1522                         gai_strerror(ret) ));
1523                 return false;
1524         }
1525
1526         /*
1527          * Make sure that getaddrinfo() returns the "correct" host name.
1528          */
1529
1530         if (ailist->ai_canonname == NULL ||
1531                 (!strequal(remotehost, ailist->ai_canonname) &&
1532                  !strequal(remotehost, "localhost"))) {
1533                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1534                          remotehost,
1535                          ailist->ai_canonname ?
1536                                  ailist->ai_canonname : "(NULL)"));
1537                 freeaddrinfo(ailist);
1538                 return false;
1539         }
1540
1541         /* Look up the host address in the address list we just got. */
1542         for (res = ailist; res; res = res->ai_next) {
1543                 if (!res->ai_addr) {
1544                         continue;
1545                 }
1546                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1547                                         (struct sockaddr *)pss)) {
1548                         freeaddrinfo(ailist);
1549                         return true;
1550                 }
1551         }
1552
1553         /*
1554          * The host name does not map to the original host address. Perhaps
1555          * someone has compromised a name server. More likely someone botched
1556          * it, but that could be dangerous, too.
1557          */
1558
1559         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1560                 print_sockaddr_len(addr_buf,
1561                         sizeof(addr_buf),
1562                         pss,
1563                         len),
1564                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1565
1566         if (ailist) {
1567                 freeaddrinfo(ailist);
1568         }
1569         return false;
1570 }
1571
1572 /*******************************************************************
1573  Deal with the singleton cache.
1574 ******************************************************************/
1575
1576 struct name_addr_pair {
1577         struct sockaddr_storage ss;
1578         const char *name;
1579 };
1580
1581 /*******************************************************************
1582  Lookup a name/addr pair. Returns memory allocated from memcache.
1583 ******************************************************************/
1584
1585 static bool lookup_nc(struct name_addr_pair *nc)
1586 {
1587         DATA_BLOB tmp;
1588
1589         ZERO_STRUCTP(nc);
1590
1591         if (!memcache_lookup(
1592                         NULL, SINGLETON_CACHE,
1593                         data_blob_string_const_null("get_peer_name"),
1594                         &tmp)) {
1595                 return false;
1596         }
1597
1598         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1599         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1600         return true;
1601 }
1602
1603 /*******************************************************************
1604  Save a name/addr pair.
1605 ******************************************************************/
1606
1607 static void store_nc(const struct name_addr_pair *nc)
1608 {
1609         DATA_BLOB tmp;
1610         size_t namelen = strlen(nc->name);
1611
1612         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1613         if (!tmp.data) {
1614                 return;
1615         }
1616         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1617         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1618
1619         memcache_add(NULL, SINGLETON_CACHE,
1620                         data_blob_string_const_null("get_peer_name"),
1621                         tmp);
1622         data_blob_free(&tmp);
1623 }
1624
1625 /*******************************************************************
1626  Return the DNS name of the remote end of a socket.
1627 ******************************************************************/
1628
1629 const char *get_peer_name(int fd, bool force_lookup)
1630 {
1631         struct name_addr_pair nc;
1632         char addr_buf[INET6_ADDRSTRLEN];
1633         struct sockaddr_storage ss;
1634         socklen_t length = sizeof(ss);
1635         const char *p;
1636         int ret;
1637         char name_buf[MAX_DNS_NAME_LENGTH];
1638         char tmp_name[MAX_DNS_NAME_LENGTH];
1639
1640         /* reverse lookups can be *very* expensive, and in many
1641            situations won't work because many networks don't link dhcp
1642            with dns. To avoid the delay we avoid the lookup if
1643            possible */
1644         if (!lp_hostname_lookups() && (force_lookup == false)) {
1645                 length = sizeof(nc.ss);
1646                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1647                         (struct sockaddr *)&nc.ss, &length);
1648                 store_nc(&nc);
1649                 lookup_nc(&nc);
1650                 return nc.name ? nc.name : "UNKNOWN";
1651         }
1652
1653         lookup_nc(&nc);
1654
1655         memset(&ss, '\0', sizeof(ss));
1656         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1657
1658         /* it might be the same as the last one - save some DNS work */
1659         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1660                 return nc.name ? nc.name : "UNKNOWN";
1661         }
1662
1663         /* Not the same. We need to lookup. */
1664         if (fd == -1) {
1665                 return "UNKNOWN";
1666         }
1667
1668         /* Look up the remote host name. */
1669         ret = sys_getnameinfo((struct sockaddr *)&ss,
1670                         length,
1671                         name_buf,
1672                         sizeof(name_buf),
1673                         NULL,
1674                         0,
1675                         0);
1676
1677         if (ret) {
1678                 DEBUG(1,("get_peer_name: getnameinfo failed "
1679                         "for %s with error %s\n",
1680                         p,
1681                         gai_strerror(ret)));
1682                 strlcpy(name_buf, p, sizeof(name_buf));
1683         } else {
1684                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1685                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1686                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1687                 }
1688         }
1689
1690         /* can't pass the same source and dest strings in when you
1691            use --enable-developer or the clobber_region() call will
1692            get you */
1693
1694         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1695         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1696         if (strstr(name_buf,"..")) {
1697                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1698         }
1699
1700         nc.name = name_buf;
1701         nc.ss = ss;
1702
1703         store_nc(&nc);
1704         lookup_nc(&nc);
1705         return nc.name ? nc.name : "UNKNOWN";
1706 }
1707
1708 /*******************************************************************
1709  Return the IP addr of the remote end of a socket as a string.
1710  ******************************************************************/
1711
1712 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1713 {
1714         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1715 }
1716
1717 /*******************************************************************
1718  Create protected unix domain socket.
1719
1720  Some unixes cannot set permissions on a ux-dom-sock, so we
1721  have to make sure that the directory contains the protection
1722  permissions instead.
1723  ******************************************************************/
1724
1725 int create_pipe_sock(const char *socket_dir,
1726                      const char *socket_name,
1727                      mode_t dir_perms)
1728 {
1729 #ifdef HAVE_UNIXSOCKET
1730         struct sockaddr_un sunaddr;
1731         struct stat st;
1732         int sock;
1733         mode_t old_umask;
1734         char *path = NULL;
1735
1736         old_umask = umask(0);
1737
1738         /* Create the socket directory or reuse the existing one */
1739
1740         if (lstat(socket_dir, &st) == -1) {
1741                 if (errno == ENOENT) {
1742                         /* Create directory */
1743                         if (mkdir(socket_dir, dir_perms) == -1) {
1744                                 DEBUG(0, ("error creating socket directory "
1745                                         "%s: %s\n", socket_dir,
1746                                         strerror(errno)));
1747                                 goto out_umask;
1748                         }
1749                 } else {
1750                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1751                                 socket_dir, strerror(errno)));
1752                         goto out_umask;
1753                 }
1754         } else {
1755                 /* Check ownership and permission on existing directory */
1756                 if (!S_ISDIR(st.st_mode)) {
1757                         DEBUG(0, ("socket directory %s isn't a directory\n",
1758                                 socket_dir));
1759                         goto out_umask;
1760                 }
1761                 if ((st.st_uid != sec_initial_uid()) ||
1762                                 ((st.st_mode & 0777) != dir_perms)) {
1763                         DEBUG(0, ("invalid permissions on socket directory "
1764                                 "%s\n", socket_dir));
1765                         goto out_umask;
1766                 }
1767         }
1768
1769         /* Create the socket file */
1770
1771         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1772
1773         if (sock == -1) {
1774                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1775                         strerror(errno) ));
1776                 goto out_close;
1777         }
1778
1779         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1780                 goto out_close;
1781         }
1782
1783         unlink(path);
1784         memset(&sunaddr, 0, sizeof(sunaddr));
1785         sunaddr.sun_family = AF_UNIX;
1786         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1787
1788         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1789                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1790                         strerror(errno)));
1791                 goto out_close;
1792         }
1793
1794         if (listen(sock, 5) == -1) {
1795                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1796                         strerror(errno)));
1797                 goto out_close;
1798         }
1799
1800         SAFE_FREE(path);
1801
1802         umask(old_umask);
1803         return sock;
1804
1805 out_close:
1806         SAFE_FREE(path);
1807         if (sock != -1)
1808                 close(sock);
1809
1810 out_umask:
1811         umask(old_umask);
1812         return -1;
1813
1814 #else
1815         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1816         return -1;
1817 #endif /* HAVE_UNIXSOCKET */
1818 }
1819
1820 /****************************************************************************
1821  Get my own canonical name, including domain.
1822 ****************************************************************************/
1823
1824 const char *get_mydnsfullname(void)
1825 {
1826         struct addrinfo *res = NULL;
1827         char my_hostname[HOST_NAME_MAX];
1828         bool ret;
1829         DATA_BLOB tmp;
1830
1831         if (memcache_lookup(NULL, SINGLETON_CACHE,
1832                         data_blob_string_const_null("get_mydnsfullname"),
1833                         &tmp)) {
1834                 SMB_ASSERT(tmp.length > 0);
1835                 return (const char *)tmp.data;
1836         }
1837
1838         /* get my host name */
1839         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1840                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1841                 return NULL;
1842         }
1843
1844         /* Ensure null termination. */
1845         my_hostname[sizeof(my_hostname)-1] = '\0';
1846
1847         ret = interpret_string_addr_internal(&res,
1848                                 my_hostname,
1849                                 AI_ADDRCONFIG|AI_CANONNAME);
1850
1851         if (!ret || res == NULL) {
1852                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1853                         "name %s [%s]\n",
1854                         my_hostname,
1855                         gai_strerror(ret) ));
1856                 return NULL;
1857         }
1858
1859         /*
1860          * Make sure that getaddrinfo() returns the "correct" host name.
1861          */
1862
1863         if (res->ai_canonname == NULL) {
1864                 DEBUG(3,("get_mydnsfullname: failed to get "
1865                         "canonical name for %s\n",
1866                         my_hostname));
1867                 freeaddrinfo(res);
1868                 return NULL;
1869         }
1870
1871         /* This copies the data, so we must do a lookup
1872          * afterwards to find the value to return.
1873          */
1874
1875         memcache_add(NULL, SINGLETON_CACHE,
1876                         data_blob_string_const_null("get_mydnsfullname"),
1877                         data_blob_string_const_null(res->ai_canonname));
1878
1879         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1880                         data_blob_string_const_null("get_mydnsfullname"),
1881                         &tmp)) {
1882                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1883                                 strlen(res->ai_canonname) + 1);
1884         }
1885
1886         freeaddrinfo(res);
1887
1888         return (const char *)tmp.data;
1889 }
1890
1891 /************************************************************
1892  Is this my name ?
1893 ************************************************************/
1894
1895 bool is_myname_or_ipaddr(const char *s)
1896 {
1897         TALLOC_CTX *ctx = talloc_tos();
1898         char addr[INET6_ADDRSTRLEN];
1899         char *name = NULL;
1900         const char *dnsname;
1901         char *servername = NULL;
1902
1903         if (!s) {
1904                 return false;
1905         }
1906
1907         /* Santize the string from '\\name' */
1908         name = talloc_strdup(ctx, s);
1909         if (!name) {
1910                 return false;
1911         }
1912
1913         servername = strrchr_m(name, '\\' );
1914         if (!servername) {
1915                 servername = name;
1916         } else {
1917                 servername++;
1918         }
1919
1920         /* Optimize for the common case */
1921         if (strequal(servername, global_myname())) {
1922                 return true;
1923         }
1924
1925         /* Check for an alias */
1926         if (is_myname(servername)) {
1927                 return true;
1928         }
1929
1930         /* Check for loopback */
1931         if (strequal(servername, "127.0.0.1") ||
1932                         strequal(servername, "::1")) {
1933                 return true;
1934         }
1935
1936         if (strequal(servername, "localhost")) {
1937                 return true;
1938         }
1939
1940         /* Maybe it's my dns name */
1941         dnsname = get_mydnsfullname();
1942         if (dnsname && strequal(servername, dnsname)) {
1943                 return true;
1944         }
1945
1946         /* Handle possible CNAME records - convert to an IP addr. */
1947         if (!is_ipaddress(servername)) {
1948                 /* Use DNS to resolve the name, but only the first address */
1949                 struct sockaddr_storage ss;
1950                 if (interpret_string_addr(&ss, servername, 0)) {
1951                         print_sockaddr(addr,
1952                                         sizeof(addr),
1953                                         &ss);
1954                         servername = addr;
1955                 }
1956         }
1957
1958         /* Maybe its an IP address? */
1959         if (is_ipaddress(servername)) {
1960                 struct sockaddr_storage ss;
1961                 struct iface_struct *nics;
1962                 int i, n;
1963
1964                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1965                         return false;
1966                 }
1967
1968                 if (ismyaddr((struct sockaddr *)&ss)) {
1969                         return true;
1970                 }
1971
1972                 if (is_zero_addr((struct sockaddr *)&ss) ||
1973                         is_loopback_addr((struct sockaddr *)&ss)) {
1974                         return false;
1975                 }
1976
1977                 n = get_interfaces(talloc_tos(), &nics);
1978                 for (i=0; i<n; i++) {
1979                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1980                                 TALLOC_FREE(nics);
1981                                 return true;
1982                         }
1983                 }
1984                 TALLOC_FREE(nics);
1985         }
1986
1987         /* No match */
1988         return false;
1989 }