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   {NULL,0,0,0,0}};
 353
 354 /****************************************************************************
 355  Print socket options.
 356 ****************************************************************************/
 357
 358 static void print_socket_options(int s)
 359 {
 360         int value;
 361         socklen_t vlen = 4;
 362         const smb_socket_option *p = &socket_options[0];
 363
 364         /* wrapped in if statement to prevent streams
 365          * leak in SCO Openserver 5.0 */
 366         /* reported on samba-technical  --jerry */
 367         if ( DEBUGLEVEL >= 5 ) {
 368                 DEBUG(5,("Socket options:\n"));
 369                 for (; p->name != NULL; p++) {
 370                         if (getsockopt(s, p->level, p->option,
 371                                                 (void *)&value, &vlen) == -1) {
 372                                 DEBUGADD(5,("\tCould not test socket option %s.\n",
 373                                                         p->name));
 374                         } else {
 375                                 DEBUGADD(5,("\t%s = %d\n",
 376                                                         p->name,value));
 377                         }
 378                 }
 379         }
 380  }
 381
 382 /****************************************************************************
 383  Set user socket options.
 384 ****************************************************************************/
 385
 386 void set_socket_options(int fd, const char *options)
 387 {
 388         TALLOC_CTX *ctx = talloc_stackframe();
 389         char *tok;
 390
 391         while (next_token_talloc(ctx, &options, &tok," \t,")) {
 392                 int ret=0,i;
 393                 int value = 1;
 394                 char *p;
 395                 bool got_value = false;
 396
 397                 if ((p = strchr_m(tok,'='))) {
 398                         *p = 0;
 399                         value = atoi(p+1);
 400                         got_value = true;
 401                 }
 402
 403                 for (i=0;socket_options[i].name;i++)
 404                         if (strequal(socket_options[i].name,tok))
 405                                 break;
 406
 407                 if (!socket_options[i].name) {
 408                         DEBUG(0,("Unknown socket option %s\n",tok));
 409                         continue;
 410                 }
 411
 412                 switch (socket_options[i].opttype) {
 413                 case OPT_BOOL:
 414                 case OPT_INT:
 415                         ret = setsockopt(fd,socket_options[i].level,
 416                                         socket_options[i].option,
 417                                         (char *)&value,sizeof(int));
 418                         break;
 419
 420                 case OPT_ON:
 421                         if (got_value)
 422                                 DEBUG(0,("syntax error - %s "
 423                                         "does not take a value\n",tok));
 424
 425                         {
 426                                 int on = socket_options[i].value;
 427                                 ret = setsockopt(fd,socket_options[i].level,
 428                                         socket_options[i].option,
 429                                         (char *)&on,sizeof(int));
 430                         }
 431                         break;
 432                 }
 433
 434                 if (ret != 0) {
 435                         /* be aware that some systems like Solaris return
 436                          * EINVAL to a setsockopt() call when the client
 437                          * sent a RST previously - no need to worry */
 438                         DEBUG(2,("Failed to set socket option %s (Error %s)\n",
 439                                 tok, strerror(errno) ));
 440                 }
 441         }
 442
 443         TALLOC_FREE(ctx);
 444         print_socket_options(fd);
 445 }
 446
 447 /****************************************************************************
 448  Read from a socket.
 449 ****************************************************************************/
 450
 451 ssize_t read_udp_v4_socket(int fd,
 452                         char *buf,
 453                         size_t len,
 454                         struct sockaddr_storage *psa)
 455 {
 456         ssize_t ret;
 457         socklen_t socklen = sizeof(*psa);
 458         struct sockaddr_in *si = (struct sockaddr_in *)psa;
 459
 460         memset((char *)psa,'\0',socklen);
 461
 462         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
 463                         (struct sockaddr *)psa,&socklen);
 464         if (ret <= 0) {
 465                 /* Don't print a low debug error for a non-blocking socket. */
 466                 if (errno == EAGAIN) {
 467                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 468                 } else {
 469                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 470                                 strerror(errno)));
 471                 }
 472                 return 0;
 473         }
 474
 475         if (psa->ss_family != AF_INET) {
 476                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 477                         "(not IPv4)\n", (int)psa->ss_family));
 478                 return 0;
 479         }
 480
 481         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 482                         inet_ntoa(si->sin_addr),
 483                         si->sin_port,
 484                         (unsigned long)ret));
 485
 486         return ret;
 487 }
 488
 489 /****************************************************************************
 490  Read data from a socket with a timout in msec.
 491  mincount = if timeout, minimum to read before returning
 492  maxcount = number to be read.
 493  time_out = timeout in milliseconds
 494 ****************************************************************************/
 495
 496 NTSTATUS read_socket_with_timeout(int fd, char *buf,
 497                                   size_t mincnt, size_t maxcnt,
 498                                   unsigned int time_out,
 499                                   size_t *size_ret)
 500 {
 501         fd_set fds;
 502         int selrtn;
 503         ssize_t readret;
 504         size_t nread = 0;
 505         struct timeval timeout;
 506         char addr[INET6_ADDRSTRLEN];
 507
 508         /* just checking .... */
 509         if (maxcnt <= 0)
 510                 return NT_STATUS_OK;
 511
 512         /* Blocking read */
 513         if (time_out == 0) {
 514                 if (mincnt == 0) {
 515                         mincnt = maxcnt;
 516                 }
 517
 518                 while (nread < mincnt) {
 519                         readret = sys_recv(fd, buf + nread, maxcnt - nread, 0);
 520
 521                         if (readret == 0) {
 522                                 DEBUG(5,("read_socket_with_timeout: "
 523                                         "blocking read. EOF from client.\n"));
 524                                 return NT_STATUS_END_OF_FILE;
 525                         }
 526
 527                         if (readret == -1) {
 528                                 if (fd == get_client_fd()) {
 529                                         /* Try and give an error message
 530                                          * saying what client failed. */
 531                                         DEBUG(0,("read_socket_with_timeout: "
 532                                                 "client %s read error = %s.\n",
 533                                                 get_peer_addr(fd,addr,sizeof(addr)),
 534                                                 strerror(errno) ));
 535                                 } else {
 536                                         DEBUG(0,("read_socket_with_timeout: "
 537                                                 "read error = %s.\n",
 538                                                 strerror(errno) ));
 539                                 }
 540                                 return map_nt_error_from_unix(errno);
 541                         }
 542                         nread += readret;
 543                 }
 544                 goto done;
 545         }
 546
 547         /* Most difficult - timeout read */
 548         /* If this is ever called on a disk file and
 549            mincnt is greater then the filesize then
 550            system performance will suffer severely as
 551            select always returns true on disk files */
 552
 553         /* Set initial timeout */
 554         timeout.tv_sec = (time_t)(time_out / 1000);
 555         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 556
 557         for (nread=0; nread < mincnt; ) {
 558                 FD_ZERO(&fds);
 559                 FD_SET(fd,&fds);
 560
 561                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 562
 563                 /* Check if error */
 564                 if (selrtn == -1) {
 565                         /* something is wrong. Maybe the socket is dead? */
 566                         if (fd == get_client_fd()) {
 567                                 /* Try and give an error message saying
 568                                  * what client failed. */
 569                                 DEBUG(0,("read_socket_with_timeout: timeout "
 570                                 "read for client %s. select error = %s.\n",
 571                                 get_peer_addr(fd,addr,sizeof(addr)),
 572                                 strerror(errno) ));
 573                         } else {
 574                                 DEBUG(0,("read_socket_with_timeout: timeout "
 575                                 "read. select error = %s.\n",
 576                                 strerror(errno) ));
 577                         }
 578                         return map_nt_error_from_unix(errno);
 579                 }
 580
 581                 /* Did we timeout ? */
 582                 if (selrtn == 0) {
 583                         DEBUG(10,("read_socket_with_timeout: timeout read. "
 584                                 "select timed out.\n"));
 585                         return NT_STATUS_IO_TIMEOUT;
 586                 }
 587
 588                 readret = sys_recv(fd, buf+nread, maxcnt-nread, 0);
 589
 590                 if (readret == 0) {
 591                         /* we got EOF on the file descriptor */
 592                         DEBUG(5,("read_socket_with_timeout: timeout read. "
 593                                 "EOF from client.\n"));
 594                         return NT_STATUS_END_OF_FILE;
 595                 }
 596
 597                 if (readret == -1) {
 598                         /* the descriptor is probably dead */
 599                         if (fd == get_client_fd()) {
 600                                 /* Try and give an error message
 601                                  * saying what client failed. */
 602                                 DEBUG(0,("read_socket_with_timeout: timeout "
 603                                         "read to client %s. read error = %s.\n",
 604                                         get_peer_addr(fd,addr,sizeof(addr)),
 605                                         strerror(errno) ));
 606                         } else {
 607                                 DEBUG(0,("read_socket_with_timeout: timeout "
 608                                         "read. read error = %s.\n",
 609                                         strerror(errno) ));
 610                         }
 611                         return map_nt_error_from_unix(errno);
 612                 }
 613
 614                 nread += readret;
 615         }
 616
 617  done:
 618         /* Return the number we got */
 619         if (size_ret) {
 620                 *size_ret = nread;
 621         }
 622         return NT_STATUS_OK;
 623 }
 624
 625 /****************************************************************************
 626  Read data from the client, reading exactly N bytes.
 627 ****************************************************************************/
 628
 629 NTSTATUS read_data(int fd, char *buffer, size_t N)
 630 {
 631         return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
 632 }
 633
 634 /****************************************************************************
 635  Write all data from an iov array
 636 ****************************************************************************/
 637
 638 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 639 {
 640         int i;
 641         size_t to_send;
 642         ssize_t thistime;
 643         size_t sent;
 644         struct iovec *iov_copy, *iov;
 645
 646         to_send = 0;
 647         for (i=0; i<iovcnt; i++) {
 648                 to_send += orig_iov[i].iov_len;
 649         }
 650
 651         thistime = sys_writev(fd, orig_iov, iovcnt);
 652         if ((thistime <= 0) || (thistime == to_send)) {
 653                 return thistime;
 654         }
 655         sent = thistime;
 656
 657         /*
 658          * We could not send everything in one call. Make a copy of iov that
 659          * we can mess with. We keep a copy of the array start in iov_copy for
 660          * the TALLOC_FREE, because we're going to modify iov later on,
 661          * discarding elements.
 662          */
 663
 664         iov_copy = (struct iovec *)TALLOC_MEMDUP(
 665                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 666
 667         if (iov_copy == NULL) {
 668                 errno = ENOMEM;
 669                 return -1;
 670         }
 671         iov = iov_copy;
 672
 673         while (sent < to_send) {
 674                 /*
 675                  * We have to discard "thistime" bytes from the beginning
 676                  * iov array, "thistime" contains the number of bytes sent
 677                  * via writev last.
 678                  */
 679                 while (thistime > 0) {
 680                         if (thistime < iov[0].iov_len) {
 681                                 char *new_base =
 682                                         (char *)iov[0].iov_base + thistime;
 683                                 iov[0].iov_base = (void *)new_base;
 684                                 iov[0].iov_len -= thistime;
 685                                 break;
 686                         }
 687                         thistime -= iov[0].iov_len;
 688                         iov += 1;
 689                         iovcnt -= 1;
 690                 }
 691
 692                 thistime = sys_writev(fd, iov, iovcnt);
 693                 if (thistime <= 0) {
 694                         break;
 695                 }
 696                 sent += thistime;
 697         }
 698
 699         TALLOC_FREE(iov_copy);
 700         return sent;
 701 }
 702
 703 /****************************************************************************
 704  Write data to a fd.
 705 ****************************************************************************/
 706
 707 ssize_t write_data(int fd, const char *buffer, size_t N)
 708 {
 709         ssize_t ret;
 710         struct iovec iov;
 711
 712         iov.iov_base = CONST_DISCARD(void *, buffer);
 713         iov.iov_len = N;
 714
 715         ret = write_data_iov(fd, &iov, 1);
 716         if (ret >= 0) {
 717                 return ret;
 718         }
 719
 720         if (fd == get_client_fd()) {
 721                 char addr[INET6_ADDRSTRLEN];
 722                 /*
 723                  * Try and give an error message saying what client failed.
 724                  */
 725                 DEBUG(0, ("write_data: write failure in writing to client %s. "
 726                           "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
 727                           strerror(errno)));
 728         } else {
 729                 DEBUG(0,("write_data: write failure. Error = %s\n",
 730                          strerror(errno) ));
 731         }
 732
 733         return -1;
 734 }
 735
 736 /****************************************************************************
 737  Send a keepalive packet (rfc1002).
 738 ****************************************************************************/
 739
 740 bool send_keepalive(int client)
 741 {
 742         unsigned char buf[4];
 743
 744         buf[0] = SMBkeepalive;
 745         buf[1] = buf[2] = buf[3] = 0;
 746
 747         return(write_data(client,(char *)buf,4) == 4);
 748 }
 749
 750 /****************************************************************************
 751  Read 4 bytes of a smb packet and return the smb length of the packet.
 752  Store the result in the buffer.
 753  This version of the function will return a length of zero on receiving
 754  a keepalive packet.
 755  Timeout is in milliseconds.
 756 ****************************************************************************/
 757
 758 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 759                                           unsigned int timeout,
 760                                           size_t *len)
 761 {
 762         int msg_type;
 763         NTSTATUS status;
 764
 765         status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 766
 767         if (!NT_STATUS_IS_OK(status)) {
 768                 return status;
 769         }
 770
 771         *len = smb_len(inbuf);
 772         msg_type = CVAL(inbuf,0);
 773
 774         if (msg_type == SMBkeepalive) {
 775                 DEBUG(5,("Got keepalive packet\n"));
 776         }
 777
 778         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 779
 780         return NT_STATUS_OK;
 781 }
 782
 783 /****************************************************************************
 784  Read 4 bytes of a smb packet and return the smb length of the packet.
 785  Store the result in the buffer. This version of the function will
 786  never return a session keepalive (length of zero).
 787  Timeout is in milliseconds.
 788 ****************************************************************************/
 789
 790 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
 791                          size_t *len)
 792 {
 793         uint8_t msgtype = SMBkeepalive;
 794
 795         while (msgtype == SMBkeepalive) {
 796                 NTSTATUS status;
 797
 798                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
 799                                                           len);
 800                 if (!NT_STATUS_IS_OK(status)) {
 801                         return status;
 802                 }
 803
 804                 msgtype = CVAL(inbuf, 0);
 805         }
 806
 807         DEBUG(10,("read_smb_length: got smb length of %lu\n",
 808                   (unsigned long)len));
 809
 810         return NT_STATUS_OK;
 811 }
 812
 813 /****************************************************************************
 814  Read an smb from a fd.
 815  The timeout is in milliseconds.
 816  This function will return on receipt of a session keepalive packet.
 817  maxlen is the max number of bytes to return, not including the 4 byte
 818  length. If zero it means buflen limit.
 819  Doesn't check the MAC on signed packets.
 820 ****************************************************************************/
 821
 822 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 823                          size_t maxlen, size_t *p_len)
 824 {
 825         size_t len;
 826         NTSTATUS status;
 827
 828         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 829
 830         if (!NT_STATUS_IS_OK(status)) {
 831                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
 832                 return status;
 833         }
 834
 835         if (len > buflen) {
 836                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 837                                         (unsigned long)len));
 838                 return NT_STATUS_INVALID_PARAMETER;
 839         }
 840
 841         if(len > 0) {
 842                 if (maxlen) {
 843                         len = MIN(len,maxlen);
 844                 }
 845
 846                 status = read_socket_with_timeout(
 847                         fd, buffer+4, len, len, timeout, &len);
 848
 849                 if (!NT_STATUS_IS_OK(status)) {
 850                         return status;
 851                 }
 852
 853                 /* not all of samba3 properly checks for packet-termination
 854                  * of strings. This ensures that we don't run off into
 855                  * empty space. */
 856                 SSVAL(buffer+4,len, 0);
 857         }
 858
 859         *p_len = len;
 860         return NT_STATUS_OK;
 861 }
 862
 863 /****************************************************************************
 864  Open a socket of the specified type, port, and address for incoming data.
 865 ****************************************************************************/
 866
 867 int open_socket_in(int type,
 868                 uint16_t port,
 869                 int dlevel,
 870                 const struct sockaddr_storage *psock,
 871                 bool rebind)
 872 {
 873         struct sockaddr_storage sock;
 874         int res;
 875         socklen_t slen = sizeof(struct sockaddr_in);
 876
 877         sock = *psock;
 878
 879 #if defined(HAVE_IPV6)
 880         if (sock.ss_family == AF_INET6) {
 881                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 882                 slen = sizeof(struct sockaddr_in6);
 883         }
 884 #endif
 885         if (sock.ss_family == AF_INET) {
 886                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 887         }
 888
 889         res = socket(sock.ss_family, type, 0 );
 890         if( res == -1 ) {
 891                 if( DEBUGLVL(0) ) {
 892                         dbgtext( "open_socket_in(): socket() call failed: " );
 893                         dbgtext( "%s\n", strerror( errno ) );
 894                 }
 895                 return -1;
 896         }
 897
 898         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 899         {
 900                 int val = rebind ? 1 : 0;
 901                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 902                                         (char *)&val,sizeof(val)) == -1 ) {
 903                         if( DEBUGLVL( dlevel ) ) {
 904                                 dbgtext( "open_socket_in(): setsockopt: " );
 905                                 dbgtext( "SO_REUSEADDR = %s ",
 906                                                 val?"true":"false" );
 907                                 dbgtext( "on port %d failed ", port );
 908                                 dbgtext( "with error = %s\n", strerror(errno) );
 909                         }
 910                 }
 911 #ifdef SO_REUSEPORT
 912                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 913                                         (char *)&val,sizeof(val)) == -1 ) {
 914                         if( DEBUGLVL( dlevel ) ) {
 915                                 dbgtext( "open_socket_in(): setsockopt: ");
 916                                 dbgtext( "SO_REUSEPORT = %s ",
 917                                                 val?"true":"false");
 918                                 dbgtext( "on port %d failed ", port);
 919                                 dbgtext( "with error = %s\n", strerror(errno));
 920                         }
 921                 }
 922 #endif /* SO_REUSEPORT */
 923         }
 924
 925         /* now we've got a socket - we need to bind it */
 926         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 927                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 928                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 929                         char addr[INET6_ADDRSTRLEN];
 930                         print_sockaddr(addr, sizeof(addr),
 931                                         &sock);
 932                         dbgtext( "bind failed on port %d ", port);
 933                         dbgtext( "socket_addr = %s.\n", addr);
 934                         dbgtext( "Error = %s\n", strerror(errno));
 935                 }
 936                 close(res);
 937                 return -1;
 938         }
 939
 940         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 941         return( res );
 942  }
 943
 944 struct open_socket_out_state {
 945         int fd;
 946         struct event_context *ev;
 947         struct sockaddr_storage ss;
 948         socklen_t salen;
 949         uint16_t port;
 950         int wait_nsec;
 951 };
 952
 953 static void open_socket_out_connected(struct tevent_req *subreq);
 954
 955 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 956 {
 957         if (s->fd != -1) {
 958                 close(s->fd);
 959         }
 960         return 0;
 961 }
 962
 963 /****************************************************************************
 964  Create an outgoing socket. timeout is in milliseconds.
 965 **************************************************************************/
 966
 967 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 968                                         struct event_context *ev,
 969                                         const struct sockaddr_storage *pss,
 970                                         uint16_t port,
 971                                         int timeout)
 972 {
 973         char addr[INET6_ADDRSTRLEN];
 974         struct tevent_req *result, *subreq;
 975         struct open_socket_out_state *state;
 976         NTSTATUS status;
 977
 978         result = tevent_req_create(mem_ctx, &state,
 979                                    struct open_socket_out_state);
 980         if (result == NULL) {
 981                 return NULL;
 982         }
 983         state->ev = ev;
 984         state->ss = *pss;
 985         state->port = port;
 986         state->wait_nsec = 10000;
 987         state->salen = -1;
 988
 989         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 990         if (state->fd == -1) {
 991                 status = map_nt_error_from_unix(errno);
 992                 goto post_status;
 993         }
 994         talloc_set_destructor(state, open_socket_out_state_destructor);
 995
 996         if (!tevent_req_set_endtime(
 997                     result, ev, timeval_current_ofs(0, timeout*1000))) {
 998                 goto fail;
 999         }
1000
1001 #if defined(HAVE_IPV6)
1002         if (pss->ss_family == AF_INET6) {
1003                 struct sockaddr_in6 *psa6;
1004                 psa6 = (struct sockaddr_in6 *)&state->ss;
1005                 psa6->sin6_port = htons(port);
1006                 if (psa6->sin6_scope_id == 0
1007                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1008                         setup_linklocal_scope_id(
1009                                 (struct sockaddr *)&(state->ss));
1010                 }
1011                 state->salen = sizeof(struct sockaddr_in6);
1012         }
1013 #endif
1014         if (pss->ss_family == AF_INET) {
1015                 struct sockaddr_in *psa;
1016                 psa = (struct sockaddr_in *)&state->ss;
1017                 psa->sin_port = htons(port);
1018                 state->salen = sizeof(struct sockaddr_in);
1019         }
1020
1021         if (pss->ss_family == AF_UNIX) {
1022                 state->salen = sizeof(struct sockaddr_un);
1023         }
1024
1025         print_sockaddr(addr, sizeof(addr), &state->ss);
1026         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1027
1028         subreq = async_connect_send(state, state->ev, state->fd,
1029                                     (struct sockaddr *)&state->ss,
1030                                     state->salen);
1031         if ((subreq == NULL)
1032             || !tevent_req_set_endtime(
1033                     subreq, state->ev,
1034                     timeval_current_ofs(0, state->wait_nsec))) {
1035                 goto fail;
1036         }
1037         tevent_req_set_callback(subreq, open_socket_out_connected, result);
1038         return result;
1039
1040  post_status:
1041         tevent_req_nterror(result, status);
1042         return tevent_req_post(result, ev);
1043  fail:
1044         TALLOC_FREE(result);
1045         return NULL;
1046 }
1047
1048 static void open_socket_out_connected(struct tevent_req *subreq)
1049 {
1050         struct tevent_req *req =
1051                 tevent_req_callback_data(subreq, struct tevent_req);
1052         struct open_socket_out_state *state =
1053                 tevent_req_data(req, struct open_socket_out_state);
1054         int ret;
1055         int sys_errno;
1056
1057         ret = async_connect_recv(subreq, &sys_errno);
1058         TALLOC_FREE(subreq);
1059         if (ret == 0) {
1060                 tevent_req_done(req);
1061                 return;
1062         }
1063
1064         if (
1065 #ifdef ETIMEDOUT
1066                 (sys_errno == ETIMEDOUT) ||
1067 #endif
1068                 (sys_errno == EINPROGRESS) ||
1069                 (sys_errno == EALREADY) ||
1070                 (sys_errno == EAGAIN)) {
1071
1072                 /*
1073                  * retry
1074                  */
1075
1076                 if (state->wait_nsec < 250000) {
1077                         state->wait_nsec *= 1.5;
1078                 }
1079
1080                 subreq = async_connect_send(state, state->ev, state->fd,
1081                                             (struct sockaddr *)&state->ss,
1082                                             state->salen);
1083                 if (tevent_req_nomem(subreq, req)) {
1084                         return;
1085                 }
1086                 if (!tevent_req_set_endtime(
1087                             subreq, state->ev,
1088                             timeval_current_ofs(0, state->wait_nsec))) {
1089                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1090                         return;
1091                 }
1092                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1093                 return;
1094         }
1095
1096 #ifdef EISCONN
1097         if (sys_errno == EISCONN) {
1098                 tevent_req_done(req);
1099                 return;
1100         }
1101 #endif
1102
1103         /* real error */
1104         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1105 }
1106
1107 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1108 {
1109         struct open_socket_out_state *state =
1110                 tevent_req_data(req, struct open_socket_out_state);
1111         NTSTATUS status;
1112
1113         if (tevent_req_is_nterror(req, &status)) {
1114                 return status;
1115         }
1116         *pfd = state->fd;
1117         state->fd = -1;
1118         return NT_STATUS_OK;
1119 }
1120
1121 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1122                          int timeout, int *pfd)
1123 {
1124         TALLOC_CTX *frame = talloc_stackframe();
1125         struct event_context *ev;
1126         struct tevent_req *req;
1127         NTSTATUS status = NT_STATUS_NO_MEMORY;
1128
1129         ev = event_context_init(frame);
1130         if (ev == NULL) {
1131                 goto fail;
1132         }
1133
1134         req = open_socket_out_send(frame, ev, pss, port, timeout);
1135         if (req == NULL) {
1136                 goto fail;
1137         }
1138         if (!tevent_req_poll(req, ev)) {
1139                 status = NT_STATUS_INTERNAL_ERROR;
1140                 goto fail;
1141         }
1142         status = open_socket_out_recv(req, pfd);
1143  fail:
1144         TALLOC_FREE(frame);
1145         return status;
1146 }
1147
1148 struct open_socket_out_defer_state {
1149         struct event_context *ev;
1150         struct sockaddr_storage ss;
1151         uint16_t port;
1152         int timeout;
1153         int fd;
1154 };
1155
1156 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1157 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1158
1159 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1160                                               struct event_context *ev,
1161                                               struct timeval wait_time,
1162                                               const struct sockaddr_storage *pss,
1163                                               uint16_t port,
1164                                               int timeout)
1165 {
1166         struct tevent_req *req, *subreq;
1167         struct open_socket_out_defer_state *state;
1168
1169         req = tevent_req_create(mem_ctx, &state,
1170                                 struct open_socket_out_defer_state);
1171         if (req == NULL) {
1172                 return NULL;
1173         }
1174         state->ev = ev;
1175         state->ss = *pss;
1176         state->port = port;
1177         state->timeout = timeout;
1178
1179         subreq = tevent_wakeup_send(
1180                 state, ev,
1181                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1182         if (subreq == NULL) {
1183                 goto fail;
1184         }
1185         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1186         return req;
1187  fail:
1188         TALLOC_FREE(req);
1189         return NULL;
1190 }
1191
1192 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1193 {
1194         struct tevent_req *req = tevent_req_callback_data(
1195                 subreq, struct tevent_req);
1196         struct open_socket_out_defer_state *state = tevent_req_data(
1197                 req, struct open_socket_out_defer_state);
1198         bool ret;
1199
1200         ret = tevent_wakeup_recv(subreq);
1201         TALLOC_FREE(subreq);
1202         if (!ret) {
1203                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1204                 return;
1205         }
1206
1207         subreq = open_socket_out_send(state, state->ev, &state->ss,
1208                                       state->port, state->timeout);
1209         if (tevent_req_nomem(subreq, req)) {
1210                 return;
1211         }
1212         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1213 }
1214
1215 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1216 {
1217         struct tevent_req *req = tevent_req_callback_data(
1218                 subreq, struct tevent_req);
1219         struct open_socket_out_defer_state *state = tevent_req_data(
1220                 req, struct open_socket_out_defer_state);
1221         NTSTATUS status;
1222
1223         status = open_socket_out_recv(subreq, &state->fd);
1224         TALLOC_FREE(subreq);
1225         if (!NT_STATUS_IS_OK(status)) {
1226                 tevent_req_nterror(req, status);
1227                 return;
1228         }
1229         tevent_req_done(req);
1230 }
1231
1232 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1233 {
1234         struct open_socket_out_defer_state *state = tevent_req_data(
1235                 req, struct open_socket_out_defer_state);
1236         NTSTATUS status;
1237
1238         if (tevent_req_is_nterror(req, &status)) {
1239                 return status;
1240         }
1241         *pfd = state->fd;
1242         state->fd = -1;
1243         return NT_STATUS_OK;
1244 }
1245
1246 /*******************************************************************
1247  Create an outgoing TCP socket to the first addr that connects.
1248
1249  This is for simultaneous connection attempts to port 445 and 139 of a host
1250  or for simultatneous connection attempts to multiple DCs at once.  We return
1251  a socket fd of the first successful connection.
1252
1253  @param[in] addrs list of Internet addresses and ports to connect to
1254  @param[in] num_addrs number of address/port pairs in the addrs list
1255  @param[in] timeout time after which we stop waiting for a socket connection
1256             to succeed, given in milliseconds
1257  @param[out] fd_index the entry in addrs which we successfully connected to
1258  @param[out] fd fd of the open and connected socket
1259  @return true on a successful connection, false if all connection attempts
1260          failed or we timed out
1261 *******************************************************************/
1262
1263 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1264                          int timeout, int *fd_index, int *fd)
1265 {
1266         int i, resulting_index, res;
1267         int *sockets;
1268         bool good_connect;
1269
1270         fd_set r_fds, wr_fds;
1271         struct timeval tv;
1272         int maxfd;
1273
1274         int connect_loop = 10000; /* 10 milliseconds */
1275
1276         timeout *= 1000;        /* convert to microseconds */
1277
1278         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1279
1280         if (sockets == NULL)
1281                 return false;
1282
1283         resulting_index = -1;
1284
1285         for (i=0; i<num_addrs; i++)
1286                 sockets[i] = -1;
1287
1288         for (i=0; i<num_addrs; i++) {
1289                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1290                 if (sockets[i] < 0)
1291                         goto done;
1292                 set_blocking(sockets[i], false);
1293         }
1294
1295  connect_again:
1296         good_connect = false;
1297
1298         for (i=0; i<num_addrs; i++) {
1299                 const struct sockaddr * a =
1300                     (const struct sockaddr *)&(addrs[i]);
1301
1302                 if (sockets[i] == -1)
1303                         continue;
1304
1305                 if (sys_connect(sockets[i], a) == 0) {
1306                         /* Rather unlikely as we are non-blocking, but it
1307                          * might actually happen. */
1308                         resulting_index = i;
1309                         goto done;
1310                 }
1311
1312                 if (errno == EINPROGRESS || errno == EALREADY ||
1313 #ifdef EISCONN
1314                         errno == EISCONN ||
1315 #endif
1316                     errno == EAGAIN || errno == EINTR) {
1317                         /* These are the error messages that something is
1318                            progressing. */
1319                         good_connect = true;
1320                 } else if (errno != 0) {
1321                         /* There was a direct error */
1322                         close(sockets[i]);
1323                         sockets[i] = -1;
1324                 }
1325         }
1326
1327         if (!good_connect) {
1328                 /* All of the connect's resulted in real error conditions */
1329                 goto done;
1330         }
1331
1332         /* Lets see if any of the connect attempts succeeded */
1333
1334         maxfd = 0;
1335         FD_ZERO(&wr_fds);
1336         FD_ZERO(&r_fds);
1337
1338         for (i=0; i<num_addrs; i++) {
1339                 if (sockets[i] == -1)
1340                         continue;
1341                 FD_SET(sockets[i], &wr_fds);
1342                 FD_SET(sockets[i], &r_fds);
1343                 if (sockets[i]>maxfd)
1344                         maxfd = sockets[i];
1345         }
1346
1347         tv.tv_sec = 0;
1348         tv.tv_usec = connect_loop;
1349
1350         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1351
1352         if (res < 0)
1353                 goto done;
1354
1355         if (res == 0)
1356                 goto next_round;
1357
1358         for (i=0; i<num_addrs; i++) {
1359
1360                 if (sockets[i] == -1)
1361                         continue;
1362
1363                 /* Stevens, Network Programming says that if there's a
1364                  * successful connect, the socket is only writable. Upon an
1365                  * error, it's both readable and writable. */
1366
1367                 if (FD_ISSET(sockets[i], &r_fds) &&
1368                     FD_ISSET(sockets[i], &wr_fds)) {
1369                         /* readable and writable, so it's an error */
1370                         close(sockets[i]);
1371                         sockets[i] = -1;
1372                         continue;
1373                 }
1374
1375                 if (!FD_ISSET(sockets[i], &r_fds) &&
1376                     FD_ISSET(sockets[i], &wr_fds)) {
1377                         /* Only writable, so it's connected */
1378                         resulting_index = i;
1379                         goto done;
1380                 }
1381         }
1382
1383  next_round:
1384
1385         timeout -= connect_loop;
1386         if (timeout <= 0)
1387                 goto done;
1388         connect_loop *= 1.5;
1389         if (connect_loop > timeout)
1390                 connect_loop = timeout;
1391         goto connect_again;
1392
1393  done:
1394         for (i=0; i<num_addrs; i++) {
1395                 if (i == resulting_index)
1396                         continue;
1397                 if (sockets[i] >= 0)
1398                         close(sockets[i]);
1399         }
1400
1401         if (resulting_index >= 0) {
1402                 *fd_index = resulting_index;
1403                 *fd = sockets[*fd_index];
1404                 set_blocking(*fd, true);
1405         }
1406
1407         free(sockets);
1408
1409         return (resulting_index >= 0);
1410 }
1411 /****************************************************************************
1412  Open a connected UDP socket to host on port
1413 **************************************************************************/
1414
1415 int open_udp_socket(const char *host, int port)
1416 {
1417         struct sockaddr_storage ss;
1418         int res;
1419
1420         if (!interpret_string_addr(&ss, host, 0)) {
1421                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1422                         host));
1423                 return -1;
1424         }
1425
1426         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1427         if (res == -1) {
1428                 return -1;
1429         }
1430
1431 #if defined(HAVE_IPV6)
1432         if (ss.ss_family == AF_INET6) {
1433                 struct sockaddr_in6 *psa6;
1434                 psa6 = (struct sockaddr_in6 *)&ss;
1435                 psa6->sin6_port = htons(port);
1436                 if (psa6->sin6_scope_id == 0
1437                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1438                         setup_linklocal_scope_id(
1439                                 (struct sockaddr *)&ss);
1440                 }
1441         }
1442 #endif
1443         if (ss.ss_family == AF_INET) {
1444                 struct sockaddr_in *psa;
1445                 psa = (struct sockaddr_in *)&ss;
1446                 psa->sin_port = htons(port);
1447         }
1448
1449         if (sys_connect(res,(struct sockaddr *)&ss)) {
1450                 close(res);
1451                 return -1;
1452         }
1453
1454         return res;
1455 }
1456
1457 /*******************************************************************
1458  Return the IP addr of the remote end of a socket as a string.
1459  Optionally return the struct sockaddr_storage.
1460  ******************************************************************/
1461
1462 static const char *get_peer_addr_internal(int fd,
1463                                 char *addr_buf,
1464                                 size_t addr_buf_len,
1465                                 struct sockaddr *pss,
1466                                 socklen_t *plength)
1467 {
1468         struct sockaddr_storage ss;
1469         socklen_t length = sizeof(ss);
1470
1471         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1472
1473         if (fd == -1) {
1474                 return addr_buf;
1475         }
1476
1477         if (pss == NULL) {
1478                 pss = (struct sockaddr *)&ss;
1479                 plength = &length;
1480         }
1481
1482         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1483                 DEBUG(0,("getpeername failed. Error was %s\n",
1484                                         strerror(errno) ));
1485                 return addr_buf;
1486         }
1487
1488         print_sockaddr_len(addr_buf,
1489                         addr_buf_len,
1490                         pss,
1491                         *plength);
1492         return addr_buf;
1493 }
1494
1495 /*******************************************************************
1496  Matchname - determine if host name matches IP address. Used to
1497  confirm a hostname lookup to prevent spoof attacks.
1498 ******************************************************************/
1499
1500 static bool matchname(const char *remotehost,
1501                 const struct sockaddr *pss,
1502                 socklen_t len)
1503 {
1504         struct addrinfo *res = NULL;
1505         struct addrinfo *ailist = NULL;
1506         char addr_buf[INET6_ADDRSTRLEN];
1507         bool ret = interpret_string_addr_internal(&ailist,
1508                         remotehost,
1509                         AI_ADDRCONFIG|AI_CANONNAME);
1510
1511         if (!ret || ailist == NULL) {
1512                 DEBUG(3,("matchname: getaddrinfo failed for "
1513                         "name %s [%s]\n",
1514                         remotehost,
1515                         gai_strerror(ret) ));
1516                 return false;
1517         }
1518
1519         /*
1520          * Make sure that getaddrinfo() returns the "correct" host name.
1521          */
1522
1523         if (ailist->ai_canonname == NULL ||
1524                 (!strequal(remotehost, ailist->ai_canonname) &&
1525                  !strequal(remotehost, "localhost"))) {
1526                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1527                          remotehost,
1528                          ailist->ai_canonname ?
1529                                  ailist->ai_canonname : "(NULL)"));
1530                 freeaddrinfo(ailist);
1531                 return false;
1532         }
1533
1534         /* Look up the host address in the address list we just got. */
1535         for (res = ailist; res; res = res->ai_next) {
1536                 if (!res->ai_addr) {
1537                         continue;
1538                 }
1539                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1540                                         (struct sockaddr *)pss)) {
1541                         freeaddrinfo(ailist);
1542                         return true;
1543                 }
1544         }
1545
1546         /*
1547          * The host name does not map to the original host address. Perhaps
1548          * someone has compromised a name server. More likely someone botched
1549          * it, but that could be dangerous, too.
1550          */
1551
1552         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1553                 print_sockaddr_len(addr_buf,
1554                         sizeof(addr_buf),
1555                         pss,
1556                         len),
1557                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1558
1559         if (ailist) {
1560                 freeaddrinfo(ailist);
1561         }
1562         return false;
1563 }
1564
1565 /*******************************************************************
1566  Deal with the singleton cache.
1567 ******************************************************************/
1568
1569 struct name_addr_pair {
1570         struct sockaddr_storage ss;
1571         const char *name;
1572 };
1573
1574 /*******************************************************************
1575  Lookup a name/addr pair. Returns memory allocated from memcache.
1576 ******************************************************************/
1577
1578 static bool lookup_nc(struct name_addr_pair *nc)
1579 {
1580         DATA_BLOB tmp;
1581
1582         ZERO_STRUCTP(nc);
1583
1584         if (!memcache_lookup(
1585                         NULL, SINGLETON_CACHE,
1586                         data_blob_string_const_null("get_peer_name"),
1587                         &tmp)) {
1588                 return false;
1589         }
1590
1591         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1592         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1593         return true;
1594 }
1595
1596 /*******************************************************************
1597  Save a name/addr pair.
1598 ******************************************************************/
1599
1600 static void store_nc(const struct name_addr_pair *nc)
1601 {
1602         DATA_BLOB tmp;
1603         size_t namelen = strlen(nc->name);
1604
1605         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1606         if (!tmp.data) {
1607                 return;
1608         }
1609         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1610         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1611
1612         memcache_add(NULL, SINGLETON_CACHE,
1613                         data_blob_string_const_null("get_peer_name"),
1614                         tmp);
1615         data_blob_free(&tmp);
1616 }
1617
1618 /*******************************************************************
1619  Return the DNS name of the remote end of a socket.
1620 ******************************************************************/
1621
1622 const char *get_peer_name(int fd, bool force_lookup)
1623 {
1624         struct name_addr_pair nc;
1625         char addr_buf[INET6_ADDRSTRLEN];
1626         struct sockaddr_storage ss;
1627         socklen_t length = sizeof(ss);
1628         const char *p;
1629         int ret;
1630         char name_buf[MAX_DNS_NAME_LENGTH];
1631         char tmp_name[MAX_DNS_NAME_LENGTH];
1632
1633         /* reverse lookups can be *very* expensive, and in many
1634            situations won't work because many networks don't link dhcp
1635            with dns. To avoid the delay we avoid the lookup if
1636            possible */
1637         if (!lp_hostname_lookups() && (force_lookup == false)) {
1638                 length = sizeof(nc.ss);
1639                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1640                         (struct sockaddr *)&nc.ss, &length);
1641                 store_nc(&nc);
1642                 lookup_nc(&nc);
1643                 return nc.name ? nc.name : "UNKNOWN";
1644         }
1645
1646         lookup_nc(&nc);
1647
1648         memset(&ss, '\0', sizeof(ss));
1649         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1650
1651         /* it might be the same as the last one - save some DNS work */
1652         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1653                 return nc.name ? nc.name : "UNKNOWN";
1654         }
1655
1656         /* Not the same. We need to lookup. */
1657         if (fd == -1) {
1658                 return "UNKNOWN";
1659         }
1660
1661         /* Look up the remote host name. */
1662         ret = sys_getnameinfo((struct sockaddr *)&ss,
1663                         length,
1664                         name_buf,
1665                         sizeof(name_buf),
1666                         NULL,
1667                         0,
1668                         0);
1669
1670         if (ret) {
1671                 DEBUG(1,("get_peer_name: getnameinfo failed "
1672                         "for %s with error %s\n",
1673                         p,
1674                         gai_strerror(ret)));
1675                 strlcpy(name_buf, p, sizeof(name_buf));
1676         } else {
1677                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1678                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1679                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1680                 }
1681         }
1682
1683         /* can't pass the same source and dest strings in when you
1684            use --enable-developer or the clobber_region() call will
1685            get you */
1686
1687         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1688         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1689         if (strstr(name_buf,"..")) {
1690                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1691         }
1692
1693         nc.name = name_buf;
1694         nc.ss = ss;
1695
1696         store_nc(&nc);
1697         lookup_nc(&nc);
1698         return nc.name ? nc.name : "UNKNOWN";
1699 }
1700
1701 /*******************************************************************
1702  Return the IP addr of the remote end of a socket as a string.
1703  ******************************************************************/
1704
1705 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1706 {
1707         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1708 }
1709
1710 /*******************************************************************
1711  Create protected unix domain socket.
1712
1713  Some unixes cannot set permissions on a ux-dom-sock, so we
1714  have to make sure that the directory contains the protection
1715  permissions instead.
1716  ******************************************************************/
1717
1718 int create_pipe_sock(const char *socket_dir,
1719                      const char *socket_name,
1720                      mode_t dir_perms)
1721 {
1722 #ifdef HAVE_UNIXSOCKET
1723         struct sockaddr_un sunaddr;
1724         struct stat st;
1725         int sock;
1726         mode_t old_umask;
1727         char *path = NULL;
1728
1729         old_umask = umask(0);
1730
1731         /* Create the socket directory or reuse the existing one */
1732
1733         if (lstat(socket_dir, &st) == -1) {
1734                 if (errno == ENOENT) {
1735                         /* Create directory */
1736                         if (mkdir(socket_dir, dir_perms) == -1) {
1737                                 DEBUG(0, ("error creating socket directory "
1738                                         "%s: %s\n", socket_dir,
1739                                         strerror(errno)));
1740                                 goto out_umask;
1741                         }
1742                 } else {
1743                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1744                                 socket_dir, strerror(errno)));
1745                         goto out_umask;
1746                 }
1747         } else {
1748                 /* Check ownership and permission on existing directory */
1749                 if (!S_ISDIR(st.st_mode)) {
1750                         DEBUG(0, ("socket directory %s isn't a directory\n",
1751                                 socket_dir));
1752                         goto out_umask;
1753                 }
1754                 if ((st.st_uid != sec_initial_uid()) ||
1755                                 ((st.st_mode & 0777) != dir_perms)) {
1756                         DEBUG(0, ("invalid permissions on socket directory "
1757                                 "%s\n", socket_dir));
1758                         goto out_umask;
1759                 }
1760         }
1761
1762         /* Create the socket file */
1763
1764         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1765
1766         if (sock == -1) {
1767                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1768                         strerror(errno) ));
1769                 goto out_close;
1770         }
1771
1772         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1773                 goto out_close;
1774         }
1775
1776         unlink(path);
1777         memset(&sunaddr, 0, sizeof(sunaddr));
1778         sunaddr.sun_family = AF_UNIX;
1779         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1780
1781         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1782                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1783                         strerror(errno)));
1784                 goto out_close;
1785         }
1786
1787         if (listen(sock, 5) == -1) {
1788                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1789                         strerror(errno)));
1790                 goto out_close;
1791         }
1792
1793         SAFE_FREE(path);
1794
1795         umask(old_umask);
1796         return sock;
1797
1798 out_close:
1799         SAFE_FREE(path);
1800         if (sock != -1)
1801                 close(sock);
1802
1803 out_umask:
1804         umask(old_umask);
1805         return -1;
1806
1807 #else
1808         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1809         return -1;
1810 #endif /* HAVE_UNIXSOCKET */
1811 }
1812
1813 /****************************************************************************
1814  Get my own canonical name, including domain.
1815 ****************************************************************************/
1816
1817 const char *get_mydnsfullname(void)
1818 {
1819         struct addrinfo *res = NULL;
1820         char my_hostname[HOST_NAME_MAX];
1821         bool ret;
1822         DATA_BLOB tmp;
1823
1824         if (memcache_lookup(NULL, SINGLETON_CACHE,
1825                         data_blob_string_const_null("get_mydnsfullname"),
1826                         &tmp)) {
1827                 SMB_ASSERT(tmp.length > 0);
1828                 return (const char *)tmp.data;
1829         }
1830
1831         /* get my host name */
1832         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1833                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1834                 return NULL;
1835         }
1836
1837         /* Ensure null termination. */
1838         my_hostname[sizeof(my_hostname)-1] = '\0';
1839
1840         ret = interpret_string_addr_internal(&res,
1841                                 my_hostname,
1842                                 AI_ADDRCONFIG|AI_CANONNAME);
1843
1844         if (!ret || res == NULL) {
1845                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1846                         "name %s [%s]\n",
1847                         my_hostname,
1848                         gai_strerror(ret) ));
1849                 return NULL;
1850         }
1851
1852         /*
1853          * Make sure that getaddrinfo() returns the "correct" host name.
1854          */
1855
1856         if (res->ai_canonname == NULL) {
1857                 DEBUG(3,("get_mydnsfullname: failed to get "
1858                         "canonical name for %s\n",
1859                         my_hostname));
1860                 freeaddrinfo(res);
1861                 return NULL;
1862         }
1863
1864         /* This copies the data, so we must do a lookup
1865          * afterwards to find the value to return.
1866          */
1867
1868         memcache_add(NULL, SINGLETON_CACHE,
1869                         data_blob_string_const_null("get_mydnsfullname"),
1870                         data_blob_string_const_null(res->ai_canonname));
1871
1872         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1873                         data_blob_string_const_null("get_mydnsfullname"),
1874                         &tmp)) {
1875                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1876                                 strlen(res->ai_canonname) + 1);
1877         }
1878
1879         freeaddrinfo(res);
1880
1881         return (const char *)tmp.data;
1882 }
1883
1884 /************************************************************
1885  Is this my name ?
1886 ************************************************************/
1887
1888 bool is_myname_or_ipaddr(const char *s)
1889 {
1890         TALLOC_CTX *ctx = talloc_tos();
1891         char addr[INET6_ADDRSTRLEN];
1892         char *name = NULL;
1893         const char *dnsname;
1894         char *servername = NULL;
1895
1896         if (!s) {
1897                 return false;
1898         }
1899
1900         /* Santize the string from '\\name' */
1901         name = talloc_strdup(ctx, s);
1902         if (!name) {
1903                 return false;
1904         }
1905
1906         servername = strrchr_m(name, '\\' );
1907         if (!servername) {
1908                 servername = name;
1909         } else {
1910                 servername++;
1911         }
1912
1913         /* Optimize for the common case */
1914         if (strequal(servername, global_myname())) {
1915                 return true;
1916         }
1917
1918         /* Check for an alias */
1919         if (is_myname(servername)) {
1920                 return true;
1921         }
1922
1923         /* Check for loopback */
1924         if (strequal(servername, "127.0.0.1") ||
1925                         strequal(servername, "::1")) {
1926                 return true;
1927         }
1928
1929         if (strequal(servername, "localhost")) {
1930                 return true;
1931         }
1932
1933         /* Maybe it's my dns name */
1934         dnsname = get_mydnsfullname();
1935         if (dnsname && strequal(servername, dnsname)) {
1936                 return true;
1937         }
1938
1939         /* Handle possible CNAME records - convert to an IP addr. */
1940         if (!is_ipaddress(servername)) {
1941                 /* Use DNS to resolve the name, but only the first address */
1942                 struct sockaddr_storage ss;
1943                 if (interpret_string_addr(&ss, servername, 0)) {
1944                         print_sockaddr(addr,
1945                                         sizeof(addr),
1946                                         &ss);
1947                         servername = addr;
1948                 }
1949         }
1950
1951         /* Maybe its an IP address? */
1952         if (is_ipaddress(servername)) {
1953                 struct sockaddr_storage ss;
1954                 struct iface_struct *nics;
1955                 int i, n;
1956
1957                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1958                         return false;
1959                 }
1960
1961                 if (ismyaddr((struct sockaddr *)&ss)) {
1962                         return true;
1963                 }
1964
1965                 if (is_zero_addr((struct sockaddr *)&ss) ||
1966                         is_loopback_addr((struct sockaddr *)&ss)) {
1967                         return false;
1968                 }
1969
1970                 n = get_interfaces(talloc_tos(), &nics);
1971                 for (i=0; i<n; i++) {
1972                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1973                                 TALLOC_FREE(nics);
1974                                 return true;
1975                         }
1976                 }
1977                 TALLOC_FREE(nics);
1978         }
1979
1980         /* No match */
1981         return false;
1982 }
1983
1984 struct getaddrinfo_state {
1985         const char *node;
1986         const char *service;
1987         const struct addrinfo *hints;
1988         struct addrinfo *res;
1989         int ret;
1990 };
1991
1992 static void getaddrinfo_do(void *private_data);
1993 static void getaddrinfo_done(struct tevent_req *subreq);
1994
1995 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1996                                     struct tevent_context *ev,
1997                                     struct fncall_context *ctx,
1998                                     const char *node,
1999                                     const char *service,
2000                                     const struct addrinfo *hints)
2001 {
2002         struct tevent_req *req, *subreq;
2003         struct getaddrinfo_state *state;
2004
2005         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
2006         if (req == NULL) {
2007                 return NULL;
2008         }
2009
2010         state->node = node;
2011         state->service = service;
2012         state->hints = hints;
2013
2014         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
2015         if (tevent_req_nomem(subreq, req)) {
2016                 return tevent_req_post(req, ev);
2017         }
2018         tevent_req_set_callback(subreq, getaddrinfo_done, req);
2019         return req;
2020 }
2021
2022 static void getaddrinfo_do(void *private_data)
2023 {
2024         struct getaddrinfo_state *state =
2025                 (struct getaddrinfo_state *)private_data;
2026
2027         state->ret = getaddrinfo(state->node, state->service, state->hints,
2028                                  &state->res);
2029 }
2030
2031 static void getaddrinfo_done(struct tevent_req *subreq)
2032 {
2033         struct tevent_req *req = tevent_req_callback_data(
2034                 subreq, struct tevent_req);
2035         int ret, err;
2036
2037         ret = fncall_recv(subreq, &err);
2038         TALLOC_FREE(subreq);
2039         if (ret == -1) {
2040                 tevent_req_error(req, err);
2041                 return;
2042         }
2043         tevent_req_done(req);
2044 }
2045
2046 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
2047 {
2048         struct getaddrinfo_state *state = tevent_req_data(
2049                 req, struct getaddrinfo_state);
2050         int err;
2051
2052         if (tevent_req_is_unix_error(req, &err)) {
2053                 switch(err) {
2054                 case ENOMEM:
2055                         return EAI_MEMORY;
2056                 default:
2057                         return EAI_FAIL;
2058                 }
2059         }
2060         if (state->ret == 0) {
2061                 *res = state->res;
2062         }
2063         return state->ret;
2064 }