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  Return true if a string could be an IPv4 address.
  26 ****************************************************************************/
  27
  28 bool is_ipaddress_v4(const char *str)
  29 {
  30         int ret = -1;
  31         struct in_addr dest;
  32
  33         ret = inet_pton(AF_INET, str, &dest);
  34         if (ret > 0) {
  35                 return true;
  36         }
  37         return false;
  38 }
  39
  40 /****************************************************************************
  41  Return true if a string could be an IPv4 or IPv6 address.
  42 ****************************************************************************/
  43
  44 bool is_ipaddress(const char *str)
  45 {
  46         int ret = -1;
  47
  48 #if defined(HAVE_IPV6)
  49         if (strchr_m(str, ':')) {
  50                 char addr[INET6_ADDRSTRLEN];
  51                 struct in6_addr dest6;
  52                 const char *sp = str;
  53                 char *p = strchr_m(str, '%');
  54
  55                 /*
  56                  * Cope with link-local.
  57                  * This is IP:v6:addr%ifname.
  58                  */
  59
  60                 if (p && (p > str) && (if_nametoindex(p+1) != 0)) {
  61                         strlcpy(addr, str,
  62                                 MIN(PTR_DIFF(p,str)+1,
  63                                         sizeof(addr)));
  64                         sp = addr;
  65                 }
  66                 ret = inet_pton(AF_INET6, addr, &dest6);
  67                 if (ret > 0) {
  68                         return true;
  69                 }
  70         }
  71 #endif
  72         return is_ipaddress_v4(str);
  73 }
  74
  75 /****************************************************************************
  76  Is a sockaddr_storage a broadcast address ?
  77 ****************************************************************************/
  78
  79 bool is_broadcast_addr(const struct sockaddr_storage *pss)
  80 {
  81 #if defined(HAVE_IPV6)
  82         if (pss->ss_family == AF_INET6) {
  83                 const struct in6_addr *sin6 =
  84                         &((const struct sockaddr_in6 *)pss)->sin6_addr;
  85                 return IN6_IS_ADDR_MULTICAST(sin6);
  86         }
  87 #endif
  88         if (pss->ss_family == AF_INET) {
  89                 uint32_t addr =
  90                 ntohl(((const struct sockaddr_in *)pss)->sin_addr.s_addr);
  91                 return addr == INADDR_BROADCAST;
  92         }
  93         return false;
  94 }
  95
  96 /*******************************************************************
  97  Wrap getaddrinfo...
  98 ******************************************************************/
  99
 100 static bool interpret_string_addr_internal(struct addrinfo **ppres,
 101                                         const char *str, int flags)
 102 {
 103         int ret;
 104         struct addrinfo hints;
 105
 106         memset(&hints, '\0', sizeof(hints));
 107         /* By default make sure it supports TCP. */
 108         hints.ai_socktype = SOCK_STREAM;
 109         hints.ai_flags = flags;
 110
 111         ret = getaddrinfo(str, NULL,
 112                         &hints,
 113                         ppres);
 114         if (ret) {
 115                 DEBUG(3,("interpret_string_addr_interal: getaddrinfo failed "
 116                         "for name %s [%s]\n",
 117                         str,
 118                         gai_strerror(ret) ));
 119                 return false;
 120         }
 121         return true;
 122 }
 123
 124 /****************************************************************************
 125  Interpret an internet address or name into an IP address in 4 byte form.
 126  RETURNS IN NETWORK BYTE ORDER (big endian).
 127 ****************************************************************************/
 128
 129 uint32 interpret_addr(const char *str)
 130 {
 131         uint32 ret;
 132
 133         /* If it's in the form of an IP address then
 134          * get the lib to interpret it */
 135         if (is_ipaddress_v4(str)) {
 136                 struct in_addr dest;
 137
 138                 if (inet_pton(AF_INET, str, &dest) <= 0) {
 139                         /* Error - this shouldn't happen ! */
 140                         DEBUG(0,("interpret_addr: inet_pton failed "
 141                                 "host %s\n",
 142                                 str));
 143                         return 0;
 144                 }
 145                 ret = dest.s_addr; /* NETWORK BYTE ORDER ! */
 146         } else {
 147                 /* Otherwise assume it's a network name of some sort and use
 148                         getadddrinfo. */
 149                 struct addrinfo *res = NULL;
 150                 struct addrinfo *res_list = NULL;
 151                 if (!interpret_string_addr_internal(&res_list,
 152                                         str,
 153                                         AI_ADDRCONFIG)) {
 154                         DEBUG(3,("interpret_addr: Unknown host. %s\n",str));
 155                         return 0;
 156                 }
 157
 158                 /* Find the first IPv4 address. */
 159                 for (res = res_list; res; res = res->ai_next) {
 160                         if (res->ai_family != AF_INET) {
 161                                 continue;
 162                         }
 163                         if (res->ai_addr == NULL) {
 164                                 continue;
 165                         }
 166                         break;
 167                 }
 168                 if(res == NULL) {
 169                         DEBUG(3,("interpret_addr: host address is "
 170                                 "invalid for host %s\n",str));
 171                         if (res_list) {
 172                                 freeaddrinfo(res_list);
 173                         }
 174                         return 0;
 175                 }
 176                 putip((char *)&ret,
 177                         &((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr);
 178                 if (res_list) {
 179                         freeaddrinfo(res_list);
 180                 }
 181         }
 182
 183         /* This is so bogus - all callers need fixing... JRA. */
 184         if (ret == (uint32)-1) {
 185                 return 0;
 186         }
 187
 188         return ret;
 189 }
 190
 191 /*******************************************************************
 192  A convenient addition to interpret_addr().
 193 ******************************************************************/
 194
 195 struct in_addr *interpret_addr2(struct in_addr *ip, const char *str)
 196 {
 197         uint32 a = interpret_addr(str);
 198         ip->s_addr = a;
 199         return ip;
 200 }
 201
 202 /*******************************************************************
 203  Map a text hostname or IP address (IPv4 or IPv6) into a
 204  struct sockaddr_storage.
 205 ******************************************************************/
 206
 207 bool interpret_string_addr(struct sockaddr_storage *pss,
 208                 const char *str,
 209                 int flags)
 210 {
 211         char addr[INET6_ADDRSTRLEN];
 212         struct addrinfo *res = NULL;
 213 #if defined(HAVE_IPV6)
 214         unsigned int scope_id = 0;
 215
 216         if (strchr_m(str, ':')) {
 217                 char *p = strchr_m(str, '%');
 218
 219                 /*
 220                  * Cope with link-local.
 221                  * This is IP:v6:addr%ifname.
 222                  */
 223
 224                 if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
 225                         strlcpy(addr, str,
 226                                 MIN(PTR_DIFF(p,str)+1,
 227                                         sizeof(addr)));
 228                         str = addr;
 229                 }
 230         }
 231 #endif
 232
 233         zero_addr(pss);
 234
 235         if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
 236                 return false;
 237         }
 238         if (!res) {
 239                 return false;
 240         }
 241         /* Copy the first sockaddr. */
 242         memcpy(pss, res->ai_addr, res->ai_addrlen);
 243
 244 #if defined(HAVE_IPV6)
 245         if (pss->ss_family == AF_INET6 && scope_id) {
 246                 struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
 247                 if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
 248                                 ps6->sin6_scope_id == 0) {
 249                         ps6->sin6_scope_id = scope_id;
 250                 }
 251         }
 252 #endif
 253
 254         freeaddrinfo(res);
 255         return true;
 256 }
 257
 258 /*******************************************************************
 259  Check if an IPv7 is 127.0.0.1
 260 ******************************************************************/
 261
 262 bool is_loopback_ip_v4(struct in_addr ip)
 263 {
 264         struct in_addr a;
 265         a.s_addr = htonl(INADDR_LOOPBACK);
 266         return(ip.s_addr == a.s_addr);
 267 }
 268
 269 /*******************************************************************
 270  Check if a struct sockaddr_storage is the loopback address.
 271 ******************************************************************/
 272
 273 bool is_loopback_addr(const struct sockaddr_storage *pss)
 274 {
 275 #if defined(HAVE_IPV6)
 276         if (pss->ss_family == AF_INET6) {
 277                 struct in6_addr *pin6 =
 278                         &((struct sockaddr_in6 *)pss)->sin6_addr;
 279                 return IN6_IS_ADDR_LOOPBACK(pin6);
 280         }
 281 #endif
 282         if (pss->ss_family == AF_INET) {
 283                 struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
 284                 return is_loopback_ip_v4(*pin);
 285         }
 286         return false;
 287 }
 288
 289 /*******************************************************************
 290  Check if an IPv4 is 0.0.0.0.
 291 ******************************************************************/
 292
 293 bool is_zero_ip_v4(struct in_addr ip)
 294 {
 295         uint32 a;
 296         putip((char *)&a,(char *)&ip);
 297         return(a == 0);
 298 }
 299
 300 /*******************************************************************
 301  Check if a struct sockaddr_storage has an unspecified address.
 302 ******************************************************************/
 303
 304 bool is_zero_addr(const struct sockaddr_storage *pss)
 305 {
 306 #if defined(HAVE_IPV6)
 307         if (pss->ss_family == AF_INET6) {
 308                 struct in6_addr *pin6 =
 309                         &((struct sockaddr_in6 *)pss)->sin6_addr;
 310                 return IN6_IS_ADDR_UNSPECIFIED(pin6);
 311         }
 312 #endif
 313         if (pss->ss_family == AF_INET) {
 314                 struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
 315                 return is_zero_ip_v4(*pin);
 316         }
 317         return false;
 318 }
 319
 320 /*******************************************************************
 321  Set an IP to 0.0.0.0.
 322 ******************************************************************/
 323
 324 void zero_ip_v4(struct in_addr *ip)
 325 {
 326         memset(ip, '\0', sizeof(struct in_addr));
 327 }
 328
 329 /*******************************************************************
 330  Set an address to INADDR_ANY.
 331 ******************************************************************/
 332
 333 void zero_addr(struct sockaddr_storage *pss)
 334 {
 335         memset(pss, '\0', sizeof(*pss));
 336         /* Ensure we're at least a valid sockaddr-storage. */
 337         pss->ss_family = AF_INET;
 338 }
 339
 340 /*******************************************************************
 341  Are two IPs on the same subnet - IPv4 version ?
 342 ********************************************************************/
 343
 344 bool same_net_v4(struct in_addr ip1,struct in_addr ip2,struct in_addr mask)
 345 {
 346         uint32 net1,net2,nmask;
 347
 348         nmask = ntohl(mask.s_addr);
 349         net1  = ntohl(ip1.s_addr);
 350         net2  = ntohl(ip2.s_addr);
 351
 352         return((net1 & nmask) == (net2 & nmask));
 353 }
 354
 355 /*******************************************************************
 356  Convert an IPv4 struct in_addr to a struct sockaddr_storage.
 357 ********************************************************************/
 358
 359 void in_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
 360                 struct in_addr ip)
 361 {
 362         struct sockaddr_in *sa = (struct sockaddr_in *)ss;
 363         memset(ss, '\0', sizeof(*ss));
 364         ss->ss_family = AF_INET;
 365         sa->sin_addr = ip;
 366 }
 367
 368 #if defined(HAVE_IPV6)
 369 /*******************************************************************
 370  Convert an IPv6 struct in_addr to a struct sockaddr_storage.
 371 ********************************************************************/
 372
 373 void in6_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
 374                 struct in6_addr ip)
 375 {
 376         struct sockaddr_in6 *sa = (struct sockaddr_in6 *)ss;
 377         memset(ss, '\0', sizeof(*ss));
 378         ss->ss_family = AF_INET6;
 379         sa->sin6_addr = ip;
 380 }
 381 #endif
 382
 383 /*******************************************************************
 384  Are two IPs on the same subnet?
 385 ********************************************************************/
 386
 387 bool same_net(const struct sockaddr_storage *ip1,
 388                 const struct sockaddr_storage *ip2,
 389                 const struct sockaddr_storage *mask)
 390 {
 391         if (ip1->ss_family != ip2->ss_family) {
 392                 /* Never on the same net. */
 393                 return false;
 394         }
 395
 396 #if defined(HAVE_IPV6)
 397         if (ip1->ss_family == AF_INET6) {
 398                 struct sockaddr_in6 ip1_6 = *(struct sockaddr_in6 *)ip1;
 399                 struct sockaddr_in6 ip2_6 = *(struct sockaddr_in6 *)ip2;
 400                 struct sockaddr_in6 mask_6 = *(struct sockaddr_in6 *)mask;
 401                 char *p1 = (char *)&ip1_6.sin6_addr;
 402                 char *p2 = (char *)&ip2_6.sin6_addr;
 403                 char *m = (char *)&mask_6.sin6_addr;
 404                 int i;
 405
 406                 for (i = 0; i < sizeof(struct in6_addr); i++) {
 407                         *p1++ &= *m;
 408                         *p2++ &= *m;
 409                         m++;
 410                 }
 411                 return (memcmp(&ip1_6.sin6_addr,
 412                                 &ip2_6.sin6_addr,
 413                                 sizeof(struct in6_addr)) == 0);
 414         }
 415 #endif
 416         if (ip1->ss_family == AF_INET) {
 417                 return same_net_v4(((const struct sockaddr_in *)ip1)->sin_addr,
 418                                 ((const struct sockaddr_in *)ip2)->sin_addr,
 419                                 ((const struct sockaddr_in *)mask)->sin_addr);
 420         }
 421         return false;
 422 }
 423
 424 /*******************************************************************
 425  Are two sockaddr_storage's the same family and address ? Ignore port etc.
 426 ********************************************************************/
 427
 428 bool addr_equal(const struct sockaddr_storage *ip1,
 429                 const struct sockaddr_storage *ip2)
 430 {
 431         if (ip1->ss_family != ip2->ss_family) {
 432                 /* Never the same. */
 433                 return false;
 434         }
 435
 436 #if defined(HAVE_IPV6)
 437         if (ip1->ss_family == AF_INET6) {
 438                 return (memcmp(&((const struct sockaddr_in6 *)ip1)->sin6_addr,
 439                                 &((const struct sockaddr_in6 *)ip2)->sin6_addr,
 440                                 sizeof(struct in6_addr)) == 0);
 441         }
 442 #endif
 443         if (ip1->ss_family == AF_INET) {
 444                 return (memcmp(&((const struct sockaddr_in *)ip1)->sin_addr,
 445                                 &((const struct sockaddr_in *)ip2)->sin_addr,
 446                                 sizeof(struct in_addr)) == 0);
 447         }
 448         return false;
 449 }
 450
 451 /****************************************************************************
 452  Is an IP address the INADDR_ANY or in6addr_any value ?
 453 ****************************************************************************/
 454
 455 bool is_address_any(const struct sockaddr_storage *psa)
 456 {
 457 #if defined(HAVE_IPV6)
 458         if (psa->ss_family == AF_INET6) {
 459                 struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)psa;
 460                 if (memcmp(&in6addr_any,
 461                                 &si6->sin6_addr,
 462                                 sizeof(in6addr_any)) == 0) {
 463                         return true;
 464                 }
 465                 return false;
 466         }
 467 #endif
 468         if (psa->ss_family == AF_INET) {
 469                 struct sockaddr_in *si = (struct sockaddr_in *)psa;
 470                 if (si->sin_addr.s_addr == INADDR_ANY) {
 471                         return true;
 472                 }
 473                 return false;
 474         }
 475         return false;
 476 }
 477
 478 /****************************************************************************
 479  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
 480 ****************************************************************************/
 481
 482 static char *print_sockaddr_len(char *dest,
 483                         size_t destlen,
 484                         const struct sockaddr_storage *psa,
 485                         socklen_t psalen)
 486 {
 487         if (destlen > 0) {
 488                 dest[0] = '\0';
 489         }
 490         (void)sys_getnameinfo((const struct sockaddr *)psa,
 491                         psalen,
 492                         dest, destlen,
 493                         NULL, 0,
 494                         NI_NUMERICHOST);
 495         return dest;
 496 }
 497
 498 /****************************************************************************
 499  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
 500 ****************************************************************************/
 501
 502 char *print_sockaddr(char *dest,
 503                         size_t destlen,
 504                         const struct sockaddr_storage *psa)
 505 {
 506         return print_sockaddr_len(dest, destlen, psa,
 507                         sizeof(struct sockaddr_storage));
 508 }
 509
 510 /****************************************************************************
 511  Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
 512 ****************************************************************************/
 513
 514 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
 515                         const struct sockaddr_storage *pss)
 516 {
 517         char addr[INET6_ADDRSTRLEN];
 518         char *dest = NULL;
 519         int ret;
 520
 521         ret = getnameinfo((const struct sockaddr *)pss,
 522                         sizeof(struct sockaddr_storage),
 523                         addr, sizeof(addr),
 524                         NULL, 0,
 525                         NI_NUMERICHOST);
 526         if (ret) {
 527                 return NULL;
 528         }
 529         if (pss->ss_family != AF_INET) {
 530 #if defined(HAVE_IPV6)
 531                 /* IPv6 */
 532                 const struct sockaddr_in6 *sa6 =
 533                         (const struct sockaddr_in6 *)pss;
 534                 uint16_t port = ntohs(sa6->sin6_port);
 535
 536                 if (port) {
 537                         dest = talloc_asprintf(ctx,
 538                                         "[%s]:%d",
 539                                         addr,
 540                                         (unsigned int)port);
 541                 } else {
 542                         dest = talloc_asprintf(ctx,
 543                                         "[%s]",
 544                                         addr);
 545                 }
 546 #else
 547                 return NULL;
 548 #endif
 549         } else {
 550                 const struct sockaddr_in *sa =
 551                         (const struct sockaddr_in *)pss;
 552                 uint16_t port = ntohs(sa->sin_port);
 553
 554                 if (port) {
 555                         dest = talloc_asprintf(ctx,
 556                                         "%s:%d",
 557                                         addr,
 558                                         (unsigned int)port);
 559                 } else {
 560                         dest = talloc_asprintf(ctx,
 561                                         "%s",
 562                                         addr);
 563                 }
 564         }
 565         return dest;
 566 }
 567
 568 /****************************************************************************
 569  Return the string of an IP address (IPv4 or IPv6).
 570 ****************************************************************************/
 571
 572 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
 573 {
 574         struct sockaddr_storage sa;
 575         socklen_t length = sizeof(sa);
 576
 577         /* Ok, returning a hard coded IPv4 address
 578          * is bogus, but it's just as bogus as a
 579          * zero IPv6 address. No good choice here.
 580          */
 581
 582         safe_strcpy(addr_buf, "0.0.0.0", addr_len-1);
 583
 584         if (fd == -1) {
 585                 return addr_buf;
 586         }
 587
 588         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 589                 DEBUG(0,("getsockname failed. Error was %s\n",
 590                         strerror(errno) ));
 591                 return addr_buf;
 592         }
 593
 594         return print_sockaddr_len(addr_buf, addr_len, &sa, length);
 595 }
 596
 597 #if 0
 598 /* Not currently used. JRA. */
 599 /****************************************************************************
 600  Return the port number we've bound to on a socket.
 601 ****************************************************************************/
 602
 603 static int get_socket_port(int fd)
 604 {
 605         struct sockaddr_storage sa;
 606         socklen_t length = sizeof(sa);
 607
 608         if (fd == -1) {
 609                 return -1;
 610         }
 611
 612         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 613                 DEBUG(0,("getpeername failed. Error was %s\n",
 614                         strerror(errno) ));
 615                 return -1;
 616         }
 617
 618 #if defined(HAVE_IPV6)
 619         if (sa.ss_family == AF_INET6) {
 620                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
 621         }
 622 #endif
 623         if (sa.ss_family == AF_INET) {
 624                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
 625         }
 626         return -1;
 627 }
 628 #endif
 629
 630 const char *client_name(int fd)
 631 {
 632         return get_peer_name(fd,false);
 633 }
 634
 635 const char *client_addr(int fd, char *addr, size_t addrlen)
 636 {
 637         return get_peer_addr(fd,addr,addrlen);
 638 }
 639
 640 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
 641 {
 642         return get_socket_addr(fd, addr, addr_len);
 643 }
 644
 645 #if 0
 646 /* Not currently used. JRA. */
 647 int client_socket_port(int fd)
 648 {
 649         return get_socket_port(fd);
 650 }
 651 #endif
 652
 653 /****************************************************************************
 654  Accessor functions to make thread-safe code easier later...
 655 ****************************************************************************/
 656
 657 static enum smb_read_errors smb_read_error = SMB_READ_OK;
 658
 659 enum smb_read_errors get_smb_read_error(void)
 660 {
 661         return smb_read_error;
 662 }
 663
 664 void set_smb_read_error(enum smb_read_errors newerr)
 665 {
 666         smb_read_error = newerr;
 667 }
 668
 669 void cond_set_smb_read_error(enum smb_read_errors newerr)
 670 {
 671         if (smb_read_error == SMB_READ_OK) {
 672                 smb_read_error = newerr;
 673         }
 674 }
 675
 676 /****************************************************************************
 677  Determine if a file descriptor is in fact a socket.
 678 ****************************************************************************/
 679
 680 bool is_a_socket(int fd)
 681 {
 682         int v;
 683         socklen_t l;
 684         l = sizeof(int);
 685         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
 686 }
 687
 688 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
 689
 690 typedef struct smb_socket_option {
 691         const char *name;
 692         int level;
 693         int option;
 694         int value;
 695         int opttype;
 696 } smb_socket_option;
 697
 698 static const smb_socket_option socket_options[] = {
 699   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
 700   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
 701   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
 702 #ifdef TCP_NODELAY
 703   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
 704 #endif
 705 #ifdef TCP_KEEPCNT
 706   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
 707 #endif
 708 #ifdef TCP_KEEPIDLE
 709   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
 710 #endif
 711 #ifdef TCP_KEEPINTVL
 712   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
 713 #endif
 714 #ifdef IPTOS_LOWDELAY
 715   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
 716 #endif
 717 #ifdef IPTOS_THROUGHPUT
 718   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
 719 #endif
 720 #ifdef SO_REUSEPORT
 721   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
 722 #endif
 723 #ifdef SO_SNDBUF
 724   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
 725 #endif
 726 #ifdef SO_RCVBUF
 727   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
 728 #endif
 729 #ifdef SO_SNDLOWAT
 730   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
 731 #endif
 732 #ifdef SO_RCVLOWAT
 733   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
 734 #endif
 735 #ifdef SO_SNDTIMEO
 736   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
 737 #endif
 738 #ifdef SO_RCVTIMEO
 739   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
 740 #endif
 741 #ifdef TCP_FASTACK
 742   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
 743 #endif
 744   {NULL,0,0,0,0}};
 745
 746 /****************************************************************************
 747  Print socket options.
 748 ****************************************************************************/
 749
 750 static void print_socket_options(int s)
 751 {
 752         int value;
 753         socklen_t vlen = 4;
 754         const smb_socket_option *p = &socket_options[0];
 755
 756         /* wrapped in if statement to prevent streams
 757          * leak in SCO Openserver 5.0 */
 758         /* reported on samba-technical  --jerry */
 759         if ( DEBUGLEVEL >= 5 ) {
 760                 for (; p->name != NULL; p++) {
 761                         if (getsockopt(s, p->level, p->option,
 762                                                 (void *)&value, &vlen) == -1) {
 763                                 DEBUG(5,("Could not test socket option %s.\n",
 764                                                         p->name));
 765                         } else {
 766                                 DEBUG(5,("socket option %s = %d\n",
 767                                                         p->name,value));
 768                         }
 769                 }
 770         }
 771  }
 772
 773 /****************************************************************************
 774  Set user socket options.
 775 ****************************************************************************/
 776
 777 void set_socket_options(int fd, const char *options)
 778 {
 779         fstring tok;
 780
 781         while (next_token(&options,tok," \t,", sizeof(tok))) {
 782                 int ret=0,i;
 783                 int value = 1;
 784                 char *p;
 785                 bool got_value = false;
 786
 787                 if ((p = strchr_m(tok,'='))) {
 788                         *p = 0;
 789                         value = atoi(p+1);
 790                         got_value = true;
 791                 }
 792
 793                 for (i=0;socket_options[i].name;i++)
 794                         if (strequal(socket_options[i].name,tok))
 795                                 break;
 796
 797                 if (!socket_options[i].name) {
 798                         DEBUG(0,("Unknown socket option %s\n",tok));
 799                         continue;
 800                 }
 801
 802                 switch (socket_options[i].opttype) {
 803                 case OPT_BOOL:
 804                 case OPT_INT:
 805                         ret = setsockopt(fd,socket_options[i].level,
 806                                         socket_options[i].option,
 807                                         (char *)&value,sizeof(int));
 808                         break;
 809
 810                 case OPT_ON:
 811                         if (got_value)
 812                                 DEBUG(0,("syntax error - %s "
 813                                         "does not take a value\n",tok));
 814
 815                         {
 816                                 int on = socket_options[i].value;
 817                                 ret = setsockopt(fd,socket_options[i].level,
 818                                         socket_options[i].option,
 819                                         (char *)&on,sizeof(int));
 820                         }
 821                         break;
 822                 }
 823
 824                 if (ret != 0) {
 825                         DEBUG(0,("Failed to set socket option %s (Error %s)\n",
 826                                 tok, strerror(errno) ));
 827                 }
 828         }
 829
 830         print_socket_options(fd);
 831 }
 832
 833 /****************************************************************************
 834  Read from a socket.
 835 ****************************************************************************/
 836
 837 ssize_t read_udp_v4_socket(int fd,
 838                         char *buf,
 839                         size_t len,
 840                         struct sockaddr_storage *psa)
 841 {
 842         ssize_t ret;
 843         socklen_t socklen = sizeof(*psa);
 844         struct sockaddr_in *si = (struct sockaddr_in *)psa;
 845
 846         memset((char *)psa,'\0',socklen);
 847
 848         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
 849                         (struct sockaddr *)psa,&socklen);
 850         if (ret <= 0) {
 851                 /* Don't print a low debug error for a non-blocking socket. */
 852                 if (errno == EAGAIN) {
 853                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 854                 } else {
 855                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 856                                 strerror(errno)));
 857                 }
 858                 return 0;
 859         }
 860
 861         if (psa->ss_family != AF_INET) {
 862                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 863                         "(not IPv4)\n", (int)psa->ss_family));
 864                 return 0;
 865         }
 866
 867         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 868                         inet_ntoa(si->sin_addr),
 869                         si->sin_port,
 870                         (unsigned long)ret));
 871
 872         return ret;
 873 }
 874
 875 /****************************************************************************
 876  Read data from a socket with a timout in msec.
 877  mincount = if timeout, minimum to read before returning
 878  maxcount = number to be read.
 879  time_out = timeout in milliseconds
 880 ****************************************************************************/
 881
 882 ssize_t read_socket_with_timeout(int fd,
 883                                 char *buf,
 884                                 size_t mincnt,
 885                                 size_t maxcnt,
 886                                 unsigned int time_out)
 887 {
 888         fd_set fds;
 889         int selrtn;
 890         ssize_t readret;
 891         size_t nread = 0;
 892         struct timeval timeout;
 893         char addr[INET6_ADDRSTRLEN];
 894
 895         /* just checking .... */
 896         if (maxcnt <= 0)
 897                 return(0);
 898
 899         set_smb_read_error(SMB_READ_OK);
 900
 901         /* Blocking read */
 902         if (time_out == 0) {
 903                 if (mincnt == 0) {
 904                         mincnt = maxcnt;
 905                 }
 906
 907                 while (nread < mincnt) {
 908                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 909
 910                         if (readret == 0) {
 911                                 DEBUG(5,("read_socket_with_timeout: "
 912                                         "blocking read. EOF from client.\n"));
 913                                 set_smb_read_error(SMB_READ_EOF);
 914                                 return -1;
 915                         }
 916
 917                         if (readret == -1) {
 918                                 if (fd == get_client_fd()) {
 919                                         /* Try and give an error message
 920                                          * saying what client failed. */
 921                                         DEBUG(0,("read_socket_with_timeout: "
 922                                                 "client %s read error = %s.\n",
 923                                                 get_peer_addr(fd,addr,sizeof(addr)),
 924                                                 strerror(errno) ));
 925                                 } else {
 926                                         DEBUG(0,("read_socket_with_timeout: "
 927                                                 "read error = %s.\n",
 928                                                 strerror(errno) ));
 929                                 }
 930                                 set_smb_read_error(SMB_READ_ERROR);
 931                                 return -1;
 932                         }
 933                         nread += readret;
 934                 }
 935                 return((ssize_t)nread);
 936         }
 937
 938         /* Most difficult - timeout read */
 939         /* If this is ever called on a disk file and
 940            mincnt is greater then the filesize then
 941            system performance will suffer severely as
 942            select always returns true on disk files */
 943
 944         /* Set initial timeout */
 945         timeout.tv_sec = (time_t)(time_out / 1000);
 946         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 947
 948         for (nread=0; nread < mincnt; ) {
 949                 FD_ZERO(&fds);
 950                 FD_SET(fd,&fds);
 951
 952                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 953
 954                 /* Check if error */
 955                 if (selrtn == -1) {
 956                         /* something is wrong. Maybe the socket is dead? */
 957                         if (fd == get_client_fd()) {
 958                                 /* Try and give an error message saying
 959                                  * what client failed. */
 960                                 DEBUG(0,("read_socket_with_timeout: timeout "
 961                                 "read for client %s. select error = %s.\n",
 962                                 get_peer_addr(fd,addr,sizeof(addr)),
 963                                 strerror(errno) ));
 964                         } else {
 965                                 DEBUG(0,("read_socket_with_timeout: timeout "
 966                                 "read. select error = %s.\n",
 967                                 strerror(errno) ));
 968                         }
 969                         set_smb_read_error(SMB_READ_ERROR);
 970                         return -1;
 971                 }
 972
 973                 /* Did we timeout ? */
 974                 if (selrtn == 0) {
 975                         DEBUG(10,("read_socket_with_timeout: timeout read. "
 976                                 "select timed out.\n"));
 977                         set_smb_read_error(SMB_READ_TIMEOUT);
 978                         return -1;
 979                 }
 980
 981                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 982
 983                 if (readret == 0) {
 984                         /* we got EOF on the file descriptor */
 985                         DEBUG(5,("read_socket_with_timeout: timeout read. "
 986                                 "EOF from client.\n"));
 987                         set_smb_read_error(SMB_READ_EOF);
 988                         return -1;
 989                 }
 990
 991                 if (readret == -1) {
 992                         /* the descriptor is probably dead */
 993                         if (fd == get_client_fd()) {
 994                                 /* Try and give an error message
 995                                  * saying what client failed. */
 996                                 DEBUG(0,("read_socket_with_timeout: timeout "
 997                                         "read to client %s. read error = %s.\n",
 998                                         get_peer_addr(fd,addr,sizeof(addr)),
 999                                         strerror(errno) ));
1000                         } else {
1001                                 DEBUG(0,("read_socket_with_timeout: timeout "
1002                                         "read. read error = %s.\n",
1003                                         strerror(errno) ));
1004                         }
1005                         set_smb_read_error(SMB_READ_ERROR);
1006                         return -1;
1007                 }
1008
1009                 nread += readret;
1010         }
1011
1012         /* Return the number we got */
1013         return (ssize_t)nread;
1014 }
1015
1016 /****************************************************************************
1017  Read data from the client, reading exactly N bytes.
1018 ****************************************************************************/
1019
1020 ssize_t read_data(int fd,char *buffer,size_t N)
1021 {
1022         ssize_t ret;
1023         size_t total=0;
1024         char addr[INET6_ADDRSTRLEN];
1025
1026         set_smb_read_error(SMB_READ_OK);
1027
1028         while (total < N) {
1029                 ret = sys_read(fd,buffer + total,N - total);
1030
1031                 if (ret == 0) {
1032                         DEBUG(10,("read_data: read of %d returned 0. "
1033                                 "Error = %s\n",
1034                                 (int)(N - total), strerror(errno) ));
1035                         set_smb_read_error(SMB_READ_EOF);
1036                         return 0;
1037                 }
1038
1039                 if (ret == -1) {
1040                         if (fd == get_client_fd()) {
1041                                 /* Try and give an error message saying
1042                                  * what client failed. */
1043                                 DEBUG(0,("read_data: read failure for %d "
1044                                         "bytes to client %s. Error = %s\n",
1045                                         (int)(N - total),
1046                                         get_peer_addr(fd,addr,sizeof(addr)),
1047                                         strerror(errno) ));
1048                         } else {
1049                                 DEBUG(0,("read_data: read failure for %d. "
1050                                         "Error = %s\n",
1051                                         (int)(N - total),
1052                                         strerror(errno) ));
1053                         }
1054                         set_smb_read_error(SMB_READ_ERROR);
1055                         return -1;
1056                 }
1057                 total += ret;
1058         }
1059         return (ssize_t)total;
1060 }
1061
1062 /****************************************************************************
1063  Write data to a fd.
1064 ****************************************************************************/
1065
1066 ssize_t write_data(int fd, const char *buffer, size_t N)
1067 {
1068         size_t total=0;
1069         ssize_t ret;
1070         char addr[INET6_ADDRSTRLEN];
1071
1072         while (total < N) {
1073                 ret = sys_write(fd,buffer + total,N - total);
1074
1075                 if (ret == -1) {
1076                         if (fd == get_client_fd()) {
1077                                 /* Try and give an error message saying
1078                                  * what client failed. */
1079                                 DEBUG(0,("write_data: write failure in "
1080                                         "writing to client %s. Error %s\n",
1081                                         get_peer_addr(fd,addr,sizeof(addr)),
1082                                         strerror(errno) ));
1083                         } else {
1084                                 DEBUG(0,("write_data: write failure. "
1085                                         "Error = %s\n", strerror(errno) ));
1086                         }
1087                         return -1;
1088                 }
1089
1090                 if (ret == 0) {
1091                         return total;
1092                 }
1093
1094                 total += ret;
1095         }
1096         return (ssize_t)total;
1097 }
1098
1099 /****************************************************************************
1100  Send a keepalive packet (rfc1002).
1101 ****************************************************************************/
1102
1103 bool send_keepalive(int client)
1104 {
1105         unsigned char buf[4];
1106
1107         buf[0] = SMBkeepalive;
1108         buf[1] = buf[2] = buf[3] = 0;
1109
1110         return(write_data(client,(char *)buf,4) == 4);
1111 }
1112
1113 /****************************************************************************
1114  Read 4 bytes of a smb packet and return the smb length of the packet.
1115  Store the result in the buffer.
1116  This version of the function will return a length of zero on receiving
1117  a keepalive packet.
1118  Timeout is in milliseconds.
1119 ****************************************************************************/
1120
1121 ssize_t read_smb_length_return_keepalive(int fd,
1122                                                 char *inbuf,
1123                                                 unsigned int timeout)
1124 {
1125         ssize_t len=0;
1126         int msg_type;
1127         bool ok = false;
1128
1129         while (!ok) {
1130                 if (timeout > 0) {
1131                         ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout)
1132                                         == 4);
1133                 } else {
1134                         ok = (read_data(fd,inbuf,4) == 4);
1135                 }
1136                 if (!ok) {
1137                         return -1;
1138                 }
1139
1140                 len = smb_len(inbuf);
1141                 msg_type = CVAL(inbuf,0);
1142
1143                 if (msg_type == SMBkeepalive) {
1144                         DEBUG(5,("Got keepalive packet\n"));
1145                 }
1146         }
1147
1148         DEBUG(10,("got smb length of %lu\n",(unsigned long)len));
1149
1150         return(len);
1151 }
1152
1153 /****************************************************************************
1154  Read 4 bytes of a smb packet and return the smb length of the packet.
1155  Store the result in the buffer. This version of the function will
1156  never return a session keepalive (length of zero).
1157  Timeout is in milliseconds.
1158 ****************************************************************************/
1159
1160 ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout)
1161 {
1162         ssize_t len;
1163
1164         for(;;) {
1165                 len = read_smb_length_return_keepalive(fd, inbuf, timeout);
1166
1167                 if(len < 0)
1168                         return len;
1169
1170                 /* Ignore session keepalives. */
1171                 if(CVAL(inbuf,0) != SMBkeepalive)
1172                         break;
1173         }
1174
1175         DEBUG(10,("read_smb_length: got smb length of %lu\n",
1176                   (unsigned long)len));
1177
1178         return len;
1179 }
1180
1181 /****************************************************************************
1182  Read an smb from a fd. Note that the buffer *MUST* be of size
1183  BUFFER_SIZE+SAFETY_MARGIN.
1184  The timeout is in milliseconds.
1185  This function will return on receipt of a session keepalive packet.
1186  maxlen is the max number of bytes to return, not including the 4 byte
1187  length. If zero it means BUFFER_SIZE+SAFETY_MARGIN limit.
1188  Doesn't check the MAC on signed packets.
1189 ****************************************************************************/
1190
1191 ssize_t receive_smb_raw(int fd,
1192                         char *buffer,
1193                         unsigned int timeout,
1194                         size_t maxlen)
1195 {
1196         ssize_t len,ret;
1197
1198         set_smb_read_error(SMB_READ_OK);
1199
1200         len = read_smb_length_return_keepalive(fd,buffer,timeout);
1201         if (len < 0) {
1202                 DEBUG(10,("receive_smb_raw: length < 0!\n"));
1203
1204                 /*
1205                  * Correct fix. smb_read_error may have already been
1206                  * set. Only set it here if not already set. Global
1207                  * variables still suck :-). JRA.
1208                  */
1209
1210                 cond_set_smb_read_error(SMB_READ_ERROR);
1211                 return -1;
1212         }
1213
1214         /*
1215          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
1216          * of header. Don't print the error if this fits.... JRA.
1217          */
1218
1219         if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
1220                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
1221                                         (unsigned long)len));
1222                 if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
1223
1224                         /*
1225                          * Correct fix. smb_read_error may have already been
1226                          * set. Only set it here if not already set. Global
1227                          * variables still suck :-). JRA.
1228                          */
1229
1230                         cond_set_smb_read_error(SMB_READ_ERROR);
1231                         return -1;
1232                 }
1233         }
1234
1235         if(len > 0) {
1236                 if (maxlen) {
1237                         len = MIN(len,maxlen);
1238                 }
1239
1240                 if (timeout > 0) {
1241                         ret = read_socket_with_timeout(fd,
1242                                         buffer+4,
1243                                         len,
1244                                         len,
1245                                         timeout);
1246                 } else {
1247                         ret = read_data(fd,buffer+4,len);
1248                 }
1249
1250                 if (ret != len) {
1251                         cond_set_smb_read_error(SMB_READ_ERROR);
1252                         return -1;
1253                 }
1254
1255                 /* not all of samba3 properly checks for packet-termination
1256                  * of strings. This ensures that we don't run off into
1257                  * empty space. */
1258                 SSVAL(buffer+4,len, 0);
1259         }
1260
1261         return len;
1262 }
1263
1264 /****************************************************************************
1265  Wrapper for receive_smb_raw().
1266  Checks the MAC on signed packets.
1267 ****************************************************************************/
1268
1269 bool receive_smb(int fd, char *buffer, unsigned int timeout)
1270 {
1271         if (receive_smb_raw(fd, buffer, timeout, 0) < 0) {
1272                 return false;
1273         }
1274
1275         /* Check the incoming SMB signature. */
1276         if (!srv_check_sign_mac(buffer, true)) {
1277                 DEBUG(0, ("receive_smb: SMB Signature verification "
1278                         "failed on incoming packet!\n"));
1279                 if (get_smb_read_error() == SMB_READ_OK) {
1280                         smb_read_error = SMB_READ_BAD_SIG;
1281                 }
1282                 return false;
1283         }
1284
1285         return true;
1286 }
1287
1288 /****************************************************************************
1289  Send an smb to a fd.
1290 ****************************************************************************/
1291
1292 bool send_smb(int fd, char *buffer)
1293 {
1294         size_t len;
1295         size_t nwritten=0;
1296         ssize_t ret;
1297
1298         /* Sign the outgoing packet if required. */
1299         srv_calculate_sign_mac(buffer);
1300
1301         len = smb_len(buffer) + 4;
1302
1303         while (nwritten < len) {
1304                 ret = write_data(fd,buffer+nwritten,len - nwritten);
1305                 if (ret <= 0) {
1306                         DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
1307                                 (int)len,(int)ret, strerror(errno) ));
1308                         return false;
1309                 }
1310                 nwritten += ret;
1311         }
1312
1313         return true;
1314 }
1315
1316 /****************************************************************************
1317  Open a socket of the specified type, port, and address for incoming data.
1318 ****************************************************************************/
1319
1320 int open_socket_in(int type,
1321                 uint16_t port,
1322                 int dlevel,
1323                 const struct sockaddr_storage *psock,
1324                 bool rebind)
1325 {
1326         struct sockaddr_storage sock;
1327         int res;
1328         socklen_t slen = sizeof(struct sockaddr_in);
1329
1330         sock = *psock;
1331
1332 #if defined(HAVE_IPV6)
1333         if (sock.ss_family == AF_INET6) {
1334                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
1335                 slen = sizeof(struct sockaddr_in6);
1336         }
1337 #endif
1338         if (sock.ss_family == AF_INET) {
1339                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
1340         }
1341
1342         res = socket(sock.ss_family, type, 0 );
1343         if( res == -1 ) {
1344                 if( DEBUGLVL(0) ) {
1345                         dbgtext( "open_socket_in(): socket() call failed: " );
1346                         dbgtext( "%s\n", strerror( errno ) );
1347                 }
1348                 return -1;
1349         }
1350
1351         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
1352         {
1353                 int val = rebind ? 1 : 0;
1354                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
1355                                         (char *)&val,sizeof(val)) == -1 ) {
1356                         if( DEBUGLVL( dlevel ) ) {
1357                                 dbgtext( "open_socket_in(): setsockopt: " );
1358                                 dbgtext( "SO_REUSEADDR = %s ",
1359                                                 val?"true":"false" );
1360                                 dbgtext( "on port %d failed ", port );
1361                                 dbgtext( "with error = %s\n", strerror(errno) );
1362                         }
1363                 }
1364 #ifdef SO_REUSEPORT
1365                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
1366                                         (char *)&val,sizeof(val)) == -1 ) {
1367                         if( DEBUGLVL( dlevel ) ) {
1368                                 dbgtext( "open_socket_in(): setsockopt: ");
1369                                 dbgtext( "SO_REUSEPORT = %s ",
1370                                                 val?"true":"false");
1371                                 dbgtext( "on port %d failed ", port);
1372                                 dbgtext( "with error = %s\n", strerror(errno));
1373                         }
1374                 }
1375 #endif /* SO_REUSEPORT */
1376         }
1377
1378         /* now we've got a socket - we need to bind it */
1379         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
1380                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
1381                                 port == SMB_PORT2 || port == NMB_PORT) ) {
1382                         char addr[INET6_ADDRSTRLEN];
1383                         print_sockaddr(addr, sizeof(addr),
1384                                         &sock);
1385                         dbgtext( "bind failed on port %d ", port);
1386                         dbgtext( "socket_addr = %s.\n", addr);
1387                         dbgtext( "Error = %s\n", strerror(errno));
1388                 }
1389                 close(res);
1390                 return -1;
1391         }
1392
1393         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
1394         return( res );
1395  }
1396
1397 /****************************************************************************
1398  Create an outgoing socket. timeout is in milliseconds.
1399 **************************************************************************/
1400
1401 int open_socket_out(int type,
1402                 const struct sockaddr_storage *pss,
1403                 uint16_t port,
1404                 int timeout)
1405 {
1406         char addr[INET6_ADDRSTRLEN];
1407         struct sockaddr_storage sock_out = *pss;
1408         int res,ret;
1409         int connect_loop = 10;
1410         int increment = 10;
1411
1412         /* create a socket to write to */
1413         res = socket(pss->ss_family, type, 0);
1414         if (res == -1) {
1415                 DEBUG(0,("socket error (%s)\n", strerror(errno)));
1416                 return -1;
1417         }
1418
1419         if (type != SOCK_STREAM) {
1420                 return res;
1421         }
1422
1423 #if defined(HAVE_IPV6)
1424         if (pss->ss_family == AF_INET6) {
1425                 struct sockaddr_in6 *psa6 = (struct sockaddr_in6 *)&sock_out;
1426                 psa6->sin6_port = htons(port);
1427                 if (psa6->sin6_scope_id == 0 &&
1428                                 IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1429                         setup_linklocal_scope_id(&sock_out);
1430                 }
1431         }
1432 #endif
1433         if (pss->ss_family == AF_INET) {
1434                 struct sockaddr_in *psa = (struct sockaddr_in *)&sock_out;
1435                 psa->sin_port = htons(port);
1436         }
1437
1438         /* set it non-blocking */
1439         set_blocking(res,false);
1440
1441         print_sockaddr(addr, sizeof(addr), &sock_out);
1442         DEBUG(3,("Connecting to %s at port %u\n",
1443                                 addr,
1444                                 (unsigned int)port));
1445
1446         /* and connect it to the destination */
1447   connect_again:
1448
1449         ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out));
1450
1451         /* Some systems return EAGAIN when they mean EINPROGRESS */
1452         if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1453                         errno == EAGAIN) && (connect_loop < timeout) ) {
1454                 smb_msleep(connect_loop);
1455                 timeout -= connect_loop;
1456                 connect_loop += increment;
1457                 if (increment < 250) {
1458                         /* After 8 rounds we end up at a max of 255 msec */
1459                         increment *= 1.5;
1460                 }
1461                 goto connect_again;
1462         }
1463
1464         if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1465                         errno == EAGAIN)) {
1466                 DEBUG(1,("timeout connecting to %s:%u\n",
1467                                         addr,
1468                                         (unsigned int)port));
1469                 close(res);
1470                 return -1;
1471         }
1472
1473 #ifdef EISCONN
1474         if (ret < 0 && errno == EISCONN) {
1475                 errno = 0;
1476                 ret = 0;
1477         }
1478 #endif
1479
1480         if (ret < 0) {
1481                 DEBUG(2,("error connecting to %s:%d (%s)\n",
1482                                 addr,
1483                                 (unsigned int)port,
1484                                 strerror(errno)));
1485                 close(res);
1486                 return -1;
1487         }
1488
1489         /* set it blocking again */
1490         set_blocking(res,true);
1491
1492         return res;
1493 }
1494
1495 /****************************************************************************
1496  Create an outgoing TCP socket to any of the addrs. This is for
1497  simultaneous connects to port 445 and 139 of a host or even a variety
1498  of DC's all of which are equivalent for our purposes.
1499 **************************************************************************/
1500
1501 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1502                          int timeout, int *fd_index, int *fd)
1503 {
1504         int i, resulting_index, res;
1505         int *sockets;
1506         bool good_connect;
1507
1508         fd_set r_fds, wr_fds;
1509         struct timeval tv;
1510         int maxfd;
1511
1512         int connect_loop = 10000; /* 10 milliseconds */
1513
1514         timeout *= 1000;        /* convert to microseconds */
1515
1516         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1517
1518         if (sockets == NULL)
1519                 return false;
1520
1521         resulting_index = -1;
1522
1523         for (i=0; i<num_addrs; i++)
1524                 sockets[i] = -1;
1525
1526         for (i=0; i<num_addrs; i++) {
1527                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1528                 if (sockets[i] < 0)
1529                         goto done;
1530                 set_blocking(sockets[i], false);
1531         }
1532
1533  connect_again:
1534         good_connect = false;
1535
1536         for (i=0; i<num_addrs; i++) {
1537
1538                 if (sockets[i] == -1)
1539                         continue;
1540
1541                 if (connect(sockets[i], (struct sockaddr *)&(addrs[i]),
1542                             sizeof(*addrs)) == 0) {
1543                         /* Rather unlikely as we are non-blocking, but it
1544                          * might actually happen. */
1545                         resulting_index = i;
1546                         goto done;
1547                 }
1548
1549                 if (errno == EINPROGRESS || errno == EALREADY ||
1550 #ifdef EISCONN
1551                         errno == EISCONN ||
1552 #endif
1553                     errno == EAGAIN || errno == EINTR) {
1554                         /* These are the error messages that something is
1555                            progressing. */
1556                         good_connect = true;
1557                 } else if (errno != 0) {
1558                         /* There was a direct error */
1559                         close(sockets[i]);
1560                         sockets[i] = -1;
1561                 }
1562         }
1563
1564         if (!good_connect) {
1565                 /* All of the connect's resulted in real error conditions */
1566                 goto done;
1567         }
1568
1569         /* Lets see if any of the connect attempts succeeded */
1570
1571         maxfd = 0;
1572         FD_ZERO(&wr_fds);
1573         FD_ZERO(&r_fds);
1574
1575         for (i=0; i<num_addrs; i++) {
1576                 if (sockets[i] == -1)
1577                         continue;
1578                 FD_SET(sockets[i], &wr_fds);
1579                 FD_SET(sockets[i], &r_fds);
1580                 if (sockets[i]>maxfd)
1581                         maxfd = sockets[i];
1582         }
1583
1584         tv.tv_sec = 0;
1585         tv.tv_usec = connect_loop;
1586
1587         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1588
1589         if (res < 0)
1590                 goto done;
1591
1592         if (res == 0)
1593                 goto next_round;
1594
1595         for (i=0; i<num_addrs; i++) {
1596
1597                 if (sockets[i] == -1)
1598                         continue;
1599
1600                 /* Stevens, Network Programming says that if there's a
1601                  * successful connect, the socket is only writable. Upon an
1602                  * error, it's both readable and writable. */
1603
1604                 if (FD_ISSET(sockets[i], &r_fds) &&
1605                     FD_ISSET(sockets[i], &wr_fds)) {
1606                         /* readable and writable, so it's an error */
1607                         close(sockets[i]);
1608                         sockets[i] = -1;
1609                         continue;
1610                 }
1611
1612                 if (!FD_ISSET(sockets[i], &r_fds) &&
1613                     FD_ISSET(sockets[i], &wr_fds)) {
1614                         /* Only writable, so it's connected */
1615                         resulting_index = i;
1616                         goto done;
1617                 }
1618         }
1619
1620  next_round:
1621
1622         timeout -= connect_loop;
1623         if (timeout <= 0)
1624                 goto done;
1625         connect_loop *= 1.5;
1626         if (connect_loop > timeout)
1627                 connect_loop = timeout;
1628         goto connect_again;
1629
1630  done:
1631         for (i=0; i<num_addrs; i++) {
1632                 if (i == resulting_index)
1633                         continue;
1634                 if (sockets[i] >= 0)
1635                         close(sockets[i]);
1636         }
1637
1638         if (resulting_index >= 0) {
1639                 *fd_index = resulting_index;
1640                 *fd = sockets[*fd_index];
1641                 set_blocking(*fd, true);
1642         }
1643
1644         free(sockets);
1645
1646         return (resulting_index >= 0);
1647 }
1648 /****************************************************************************
1649  Open a connected UDP socket to host on port
1650 **************************************************************************/
1651
1652 int open_udp_socket(const char *host, int port)
1653 {
1654         int type = SOCK_DGRAM;
1655         struct sockaddr_in sock_out;
1656         int res;
1657         struct in_addr addr;
1658
1659         (void)interpret_addr2(&addr, host);
1660
1661         res = socket(PF_INET, type, 0);
1662         if (res == -1) {
1663                 return -1;
1664         }
1665
1666         memset((char *)&sock_out,'\0',sizeof(sock_out));
1667         putip((char *)&sock_out.sin_addr,(char *)&addr);
1668         sock_out.sin_port = htons(port);
1669         sock_out.sin_family = PF_INET;
1670
1671         if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
1672                 close(res);
1673                 return -1;
1674         }
1675
1676         return res;
1677 }
1678
1679 /*******************************************************************
1680  Return the IP addr of the remote end of a socket as a string.
1681  Optionally return the struct sockaddr_storage.
1682  ******************************************************************/
1683
1684 static const char *get_peer_addr_internal(int fd,
1685                                 char *addr_buf,
1686                                 size_t addr_buf_len,
1687                                 struct sockaddr_storage *pss,
1688                                 socklen_t *plength)
1689 {
1690         struct sockaddr_storage ss;
1691         socklen_t length = sizeof(ss);
1692
1693         safe_strcpy(addr_buf,"0.0.0.0",addr_buf_len-1);
1694
1695         if (fd == -1) {
1696                 return addr_buf;
1697         }
1698
1699         if (pss == NULL) {
1700                 pss = &ss;
1701         }
1702         if (plength == NULL) {
1703                 plength = &length;
1704         }
1705
1706         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1707                 DEBUG(0,("getpeername failed. Error was %s\n",
1708                                         strerror(errno) ));
1709                 return addr_buf;
1710         }
1711
1712         print_sockaddr_len(addr_buf,
1713                         addr_buf_len,
1714                         pss,
1715                         *plength);
1716         return addr_buf;
1717 }
1718
1719 /*******************************************************************
1720  Matchname - determine if host name matches IP address. Used to
1721  confirm a hostname lookup to prevent spoof attacks.
1722 ******************************************************************/
1723
1724 static bool matchname(const char *remotehost,
1725                 const struct sockaddr_storage *pss,
1726                 socklen_t len)
1727 {
1728         struct addrinfo *res = NULL;
1729         struct addrinfo *ailist = NULL;
1730         char addr_buf[INET6_ADDRSTRLEN];
1731         bool ret = interpret_string_addr_internal(&ailist,
1732                         remotehost,
1733                         AI_ADDRCONFIG|AI_CANONNAME);
1734
1735         if (!ret || ailist == NULL) {
1736                 DEBUG(3,("matchname: getaddrinfo failed for "
1737                         "name %s [%s]\n",
1738                         remotehost,
1739                         gai_strerror(ret) ));
1740                 return false;
1741         }
1742
1743         /*
1744          * Make sure that getaddrinfo() returns the "correct" host name.
1745          */
1746
1747         if (ailist->ai_canonname == NULL ||
1748                 (!strequal(remotehost, ailist->ai_canonname) &&
1749                  !strequal(remotehost, "localhost"))) {
1750                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1751                          remotehost,
1752                          ailist->ai_canonname ?
1753                                  ailist->ai_canonname : "(NULL)"));
1754                 freeaddrinfo(ailist);
1755                 return false;
1756         }
1757
1758         /* Look up the host address in the address list we just got. */
1759         for (res = ailist; res; res = res->ai_next) {
1760                 if (!res->ai_addr) {
1761                         continue;
1762                 }
1763                 if (addr_equal((const struct sockaddr_storage *)res->ai_addr,
1764                                         pss)) {
1765                         freeaddrinfo(ailist);
1766                         return true;
1767                 }
1768         }
1769
1770         /*
1771          * The host name does not map to the original host address. Perhaps
1772          * someone has compromised a name server. More likely someone botched
1773          * it, but that could be dangerous, too.
1774          */
1775
1776         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1777                 print_sockaddr_len(addr_buf,
1778                         sizeof(addr_buf),
1779                         pss,
1780                         len),
1781                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1782
1783         if (ailist) {
1784                 freeaddrinfo(ailist);
1785         }
1786         return false;
1787 }
1788
1789 /*******************************************************************
1790  Return the DNS name of the remote end of a socket.
1791 ******************************************************************/
1792
1793 static char addr_buf_cache[INET6_ADDRSTRLEN];
1794
1795 const char *get_peer_name(int fd, bool force_lookup)
1796 {
1797         static pstring name_buf;
1798         char addr_buf[INET6_ADDRSTRLEN];
1799         struct sockaddr_storage ss;
1800         socklen_t length = sizeof(ss);
1801         const char *p;
1802         int ret;
1803         pstring tmp_name;
1804
1805         /* reverse lookups can be *very* expensive, and in many
1806            situations won't work because many networks don't link dhcp
1807            with dns. To avoid the delay we avoid the lookup if
1808            possible */
1809         if (!lp_hostname_lookups() && (force_lookup == false)) {
1810                 pstrcpy(name_buf, get_peer_addr(fd, addr_buf, sizeof(addr_buf)));
1811                 return name_buf;
1812         }
1813
1814         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), &ss, &length);
1815
1816         /* it might be the same as the last one - save some DNS work */
1817         if (strcmp(p, addr_buf_cache) == 0) {
1818                 return name_buf;
1819         }
1820
1821         pstrcpy(name_buf,"UNKNOWN");
1822         if (fd == -1) {
1823                 return name_buf;
1824         }
1825
1826         safe_strcpy(addr_buf_cache, p, sizeof(addr_buf_cache)-1);
1827
1828         /* Look up the remote host name. */
1829         ret = getnameinfo((struct sockaddr *)&ss,
1830                         length,
1831                         name_buf,
1832                         sizeof(name_buf),
1833                         NULL,
1834                         0,
1835                         0);
1836
1837         if (ret) {
1838                 DEBUG(1,("get_peer_name: getnameinfo failed "
1839                         "for %s with error %s\n",
1840                         p,
1841                         gai_strerror(ret)));
1842                 pstrcpy(name_buf, p);
1843         } else {
1844                 if (!matchname(name_buf, &ss, length)) {
1845                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1846                         pstrcpy(name_buf,"UNKNOWN");
1847                 }
1848         }
1849
1850         /* can't pass the same source and dest strings in when you
1851            use --enable-developer or the clobber_region() call will
1852            get you */
1853
1854         pstrcpy(tmp_name, name_buf );
1855         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1856         if (strstr(name_buf,"..")) {
1857                 pstrcpy(name_buf, "UNKNOWN");
1858         }
1859
1860         return name_buf;
1861 }
1862
1863 /*******************************************************************
1864  Return the IP addr of the remote end of a socket as a string.
1865  ******************************************************************/
1866
1867 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1868 {
1869         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1870 }
1871
1872 /*******************************************************************
1873  Create protected unix domain socket.
1874
1875  Some unixes cannot set permissions on a ux-dom-sock, so we
1876  have to make sure that the directory contains the protection
1877  permissions instead.
1878  ******************************************************************/
1879
1880 int create_pipe_sock(const char *socket_dir,
1881                      const char *socket_name,
1882                      mode_t dir_perms)
1883 {
1884 #ifdef HAVE_UNIXSOCKET
1885         struct sockaddr_un sunaddr;
1886         struct stat st;
1887         int sock;
1888         mode_t old_umask;
1889         pstring path;
1890
1891         old_umask = umask(0);
1892
1893         /* Create the socket directory or reuse the existing one */
1894
1895         if (lstat(socket_dir, &st) == -1) {
1896                 if (errno == ENOENT) {
1897                         /* Create directory */
1898                         if (mkdir(socket_dir, dir_perms) == -1) {
1899                                 DEBUG(0, ("error creating socket directory "
1900                                         "%s: %s\n", socket_dir,
1901                                         strerror(errno)));
1902                                 goto out_umask;
1903                         }
1904                 } else {
1905                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1906                                 socket_dir, strerror(errno)));
1907                         goto out_umask;
1908                 }
1909         } else {
1910                 /* Check ownership and permission on existing directory */
1911                 if (!S_ISDIR(st.st_mode)) {
1912                         DEBUG(0, ("socket directory %s isn't a directory\n",
1913                                 socket_dir));
1914                         goto out_umask;
1915                 }
1916                 if ((st.st_uid != sec_initial_uid()) ||
1917                                 ((st.st_mode & 0777) != dir_perms)) {
1918                         DEBUG(0, ("invalid permissions on socket directory "
1919                                 "%s\n", socket_dir));
1920                         goto out_umask;
1921                 }
1922         }
1923
1924         /* Create the socket file */
1925
1926         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1927
1928         if (sock == -1) {
1929                 perror("socket");
1930                 goto out_umask;
1931         }
1932
1933         pstr_sprintf(path, "%s/%s", socket_dir, socket_name);
1934
1935         unlink(path);
1936         memset(&sunaddr, 0, sizeof(sunaddr));
1937         sunaddr.sun_family = AF_UNIX;
1938         safe_strcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)-1);
1939
1940         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1941                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1942                         strerror(errno)));
1943                 goto out_close;
1944         }
1945
1946         if (listen(sock, 5) == -1) {
1947                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1948                         strerror(errno)));
1949                 goto out_close;
1950         }
1951
1952         umask(old_umask);
1953         return sock;
1954
1955 out_close:
1956         close(sock);
1957
1958 out_umask:
1959         umask(old_umask);
1960         return -1;
1961
1962 #else
1963         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1964         return -1;
1965 #endif /* HAVE_UNIXSOCKET */
1966 }
1967
1968 /****************************************************************************
1969  Get my own canonical name, including domain.
1970 ****************************************************************************/
1971
1972 static fstring dnshostname_cache;
1973
1974 bool get_mydnsfullname(fstring my_dnsname)
1975 {
1976         if (!*dnshostname_cache) {
1977                 struct addrinfo *res = NULL;
1978                 bool ret;
1979
1980                 /* get my host name */
1981                 if (gethostname(dnshostname_cache, sizeof(dnshostname_cache)) == -1) {
1982                         *dnshostname_cache = '\0';
1983                         DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1984                         return false;
1985                 }
1986
1987                 /* Ensure null termination. */
1988                 dnshostname_cache[sizeof(dnshostname_cache)-1] = '\0';
1989
1990                 ret = interpret_string_addr_internal(&res,
1991                                         dnshostname_cache,
1992                                         AI_ADDRCONFIG|AI_CANONNAME);
1993
1994                 if (!ret || res == NULL) {
1995                         DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1996                                 "name %s [%s]\n",
1997                                 dnshostname_cache,
1998                                 gai_strerror(ret) ));
1999                         return false;
2000                 }
2001
2002                 /*
2003                  * Make sure that getaddrinfo() returns the "correct" host name.
2004                  */
2005
2006                 if (res->ai_canonname == NULL) {
2007                         DEBUG(3,("get_mydnsfullname: failed to get "
2008                                 "canonical name for %s\n",
2009                                 dnshostname_cache));
2010                         freeaddrinfo(res);
2011                         return false;
2012                 }
2013
2014
2015                 fstrcpy(dnshostname_cache, res->ai_canonname);
2016                 freeaddrinfo(res);
2017         }
2018         fstrcpy(my_dnsname, dnshostname_cache);
2019         return true;
2020 }
2021
2022 /************************************************************
2023  Is this my name ?
2024 ************************************************************/
2025
2026 bool is_myname_or_ipaddr(const char *s)
2027 {
2028         fstring name, dnsname;
2029         char *servername;
2030
2031         if (!s) {
2032                 return false;
2033         }
2034
2035         /* Santize the string from '\\name' */
2036         fstrcpy(name, s);
2037
2038         servername = strrchr_m(name, '\\' );
2039         if (!servername) {
2040                 servername = name;
2041         } else {
2042                 servername++;
2043         }
2044
2045         /* Optimize for the common case */
2046         if (strequal(servername, global_myname())) {
2047                 return true;
2048         }
2049
2050         /* Check for an alias */
2051         if (is_myname(servername)) {
2052                 return true;
2053         }
2054
2055         /* Check for loopback */
2056         if (strequal(servername, "127.0.0.1") ||
2057                         strequal(servername, "::1")) {
2058                 return true;
2059         }
2060
2061         if (strequal(servername, "localhost")) {
2062                 return true;
2063         }
2064
2065         /* Maybe it's my dns name */
2066         if (get_mydnsfullname(dnsname)) {
2067                 if (strequal(servername, dnsname)) {
2068                         return true;
2069                 }
2070         }
2071
2072         /* Handle possible CNAME records - convert to an IP addr. */
2073         if (!is_ipaddress(servername)) {
2074                 /* Use DNS to resolve the name, but only the first address */
2075                 struct sockaddr_storage ss;
2076                 if (interpret_string_addr(&ss, servername,0)) {
2077                         print_sockaddr(name,
2078                                         sizeof(name),
2079                                         &ss);
2080                         servername = name;
2081                 }
2082         }
2083
2084         /* Maybe its an IP address? */
2085         if (is_ipaddress(servername)) {
2086                 struct sockaddr_storage ss;
2087                 struct iface_struct nics[MAX_INTERFACES];
2088                 int i, n;
2089
2090                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
2091                         return false;
2092                 }
2093
2094                 if (is_zero_addr(&ss) || is_loopback_addr(&ss)) {
2095                         return false;
2096                 }
2097
2098                 n = get_interfaces(nics, MAX_INTERFACES);
2099                 for (i=0; i<n; i++) {
2100                         if (addr_equal(&nics[i].ip, &ss)) {
2101                                 return true;
2102                         }
2103                 }
2104         }
2105
2106         /* No match */
2107         return false;
2108 }