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, sp, &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         /* Linux man page on getaddinfo() says port will be
 112            uninitialized when service string in NULL */
 113
 114         ret = getaddrinfo(str, NULL,
 115                         &hints,
 116                         ppres);
 117
 118         if (ret) {
 119                 DEBUG(3,("interpret_string_addr_internal: getaddrinfo failed "
 120                         "for name %s [%s]\n",
 121                         str,
 122                         gai_strerror(ret) ));
 123                 return false;
 124         }
 125         return true;
 126 }
 127
 128 /****************************************************************************
 129  Interpret an internet address or name into an IP address in 4 byte form.
 130  RETURNS IN NETWORK BYTE ORDER (big endian).
 131 ****************************************************************************/
 132
 133 uint32 interpret_addr(const char *str)
 134 {
 135         uint32 ret;
 136
 137         /* If it's in the form of an IP address then
 138          * get the lib to interpret it */
 139         if (is_ipaddress_v4(str)) {
 140                 struct in_addr dest;
 141
 142                 if (inet_pton(AF_INET, str, &dest) <= 0) {
 143                         /* Error - this shouldn't happen ! */
 144                         DEBUG(0,("interpret_addr: inet_pton failed "
 145                                 "host %s\n",
 146                                 str));
 147                         return 0;
 148                 }
 149                 ret = dest.s_addr; /* NETWORK BYTE ORDER ! */
 150         } else {
 151                 /* Otherwise assume it's a network name of some sort and use
 152                         getadddrinfo. */
 153                 struct addrinfo *res = NULL;
 154                 struct addrinfo *res_list = NULL;
 155                 if (!interpret_string_addr_internal(&res_list,
 156                                         str,
 157                                         AI_ADDRCONFIG)) {
 158                         DEBUG(3,("interpret_addr: Unknown host. %s\n",str));
 159                         return 0;
 160                 }
 161
 162                 /* Find the first IPv4 address. */
 163                 for (res = res_list; res; res = res->ai_next) {
 164                         if (res->ai_family != AF_INET) {
 165                                 continue;
 166                         }
 167                         if (res->ai_addr == NULL) {
 168                                 continue;
 169                         }
 170                         break;
 171                 }
 172                 if(res == NULL) {
 173                         DEBUG(3,("interpret_addr: host address is "
 174                                 "invalid for host %s\n",str));
 175                         if (res_list) {
 176                                 freeaddrinfo(res_list);
 177                         }
 178                         return 0;
 179                 }
 180                 putip((char *)&ret,
 181                         &((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr);
 182                 if (res_list) {
 183                         freeaddrinfo(res_list);
 184                 }
 185         }
 186
 187         /* This is so bogus - all callers need fixing... JRA. */
 188         if (ret == (uint32)-1) {
 189                 return 0;
 190         }
 191
 192         return ret;
 193 }
 194
 195 /*******************************************************************
 196  A convenient addition to interpret_addr().
 197 ******************************************************************/
 198
 199 struct in_addr *interpret_addr2(struct in_addr *ip, const char *str)
 200 {
 201         uint32 a = interpret_addr(str);
 202         ip->s_addr = a;
 203         return ip;
 204 }
 205
 206 /*******************************************************************
 207  Map a text hostname or IP address (IPv4 or IPv6) into a
 208  struct sockaddr_storage.
 209 ******************************************************************/
 210
 211 bool interpret_string_addr(struct sockaddr_storage *pss,
 212                 const char *str,
 213                 int flags)
 214 {
 215         char addr[INET6_ADDRSTRLEN];
 216         struct addrinfo *res = NULL;
 217 #if defined(HAVE_IPV6)
 218         unsigned int scope_id = 0;
 219
 220         if (strchr_m(str, ':')) {
 221                 char *p = strchr_m(str, '%');
 222
 223                 /*
 224                  * Cope with link-local.
 225                  * This is IP:v6:addr%ifname.
 226                  */
 227
 228                 if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
 229                         strlcpy(addr, str,
 230                                 MIN(PTR_DIFF(p,str)+1,
 231                                         sizeof(addr)));
 232                         str = addr;
 233                 }
 234         }
 235 #endif
 236
 237         zero_addr(pss);
 238
 239         if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
 240                 return false;
 241         }
 242         if (!res) {
 243                 return false;
 244         }
 245         /* Copy the first sockaddr. */
 246         memcpy(pss, res->ai_addr, res->ai_addrlen);
 247
 248 #if defined(HAVE_IPV6)
 249         if (pss->ss_family == AF_INET6 && scope_id) {
 250                 struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
 251                 if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
 252                                 ps6->sin6_scope_id == 0) {
 253                         ps6->sin6_scope_id = scope_id;
 254                 }
 255         }
 256 #endif
 257
 258         freeaddrinfo(res);
 259         return true;
 260 }
 261
 262 /*******************************************************************
 263  Check if an IPv7 is 127.0.0.1
 264 ******************************************************************/
 265
 266 bool is_loopback_ip_v4(struct in_addr ip)
 267 {
 268         struct in_addr a;
 269         a.s_addr = htonl(INADDR_LOOPBACK);
 270         return(ip.s_addr == a.s_addr);
 271 }
 272
 273 /*******************************************************************
 274  Check if a struct sockaddr_storage is the loopback address.
 275 ******************************************************************/
 276
 277 bool is_loopback_addr(const struct sockaddr_storage *pss)
 278 {
 279 #if defined(HAVE_IPV6)
 280         if (pss->ss_family == AF_INET6) {
 281                 struct in6_addr *pin6 =
 282                         &((struct sockaddr_in6 *)pss)->sin6_addr;
 283                 return IN6_IS_ADDR_LOOPBACK(pin6);
 284         }
 285 #endif
 286         if (pss->ss_family == AF_INET) {
 287                 struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
 288                 return is_loopback_ip_v4(*pin);
 289         }
 290         return false;
 291 }
 292
 293 /*******************************************************************
 294  Check if an IPv4 is 0.0.0.0.
 295 ******************************************************************/
 296
 297 bool is_zero_ip_v4(struct in_addr ip)
 298 {
 299         uint32 a;
 300         putip((char *)&a,(char *)&ip);
 301         return(a == 0);
 302 }
 303
 304 /*******************************************************************
 305  Check if a struct sockaddr_storage has an unspecified address.
 306 ******************************************************************/
 307
 308 bool is_zero_addr(const struct sockaddr_storage *pss)
 309 {
 310 #if defined(HAVE_IPV6)
 311         if (pss->ss_family == AF_INET6) {
 312                 struct in6_addr *pin6 =
 313                         &((struct sockaddr_in6 *)pss)->sin6_addr;
 314                 return IN6_IS_ADDR_UNSPECIFIED(pin6);
 315         }
 316 #endif
 317         if (pss->ss_family == AF_INET) {
 318                 struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
 319                 return is_zero_ip_v4(*pin);
 320         }
 321         return false;
 322 }
 323
 324 /*******************************************************************
 325  Set an IP to 0.0.0.0.
 326 ******************************************************************/
 327
 328 void zero_ip_v4(struct in_addr *ip)
 329 {
 330         memset(ip, '\0', sizeof(struct in_addr));
 331 }
 332
 333 /*******************************************************************
 334  Set an address to INADDR_ANY.
 335 ******************************************************************/
 336
 337 void zero_addr(struct sockaddr_storage *pss)
 338 {
 339         memset(pss, '\0', sizeof(*pss));
 340         /* Ensure we're at least a valid sockaddr-storage. */
 341         pss->ss_family = AF_INET;
 342 }
 343
 344 /*******************************************************************
 345  Are two IPs on the same subnet - IPv4 version ?
 346 ********************************************************************/
 347
 348 bool same_net_v4(struct in_addr ip1,struct in_addr ip2,struct in_addr mask)
 349 {
 350         uint32 net1,net2,nmask;
 351
 352         nmask = ntohl(mask.s_addr);
 353         net1  = ntohl(ip1.s_addr);
 354         net2  = ntohl(ip2.s_addr);
 355
 356         return((net1 & nmask) == (net2 & nmask));
 357 }
 358
 359 /*******************************************************************
 360  Convert an IPv4 struct in_addr to a struct sockaddr_storage.
 361 ********************************************************************/
 362
 363 void in_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
 364                 struct in_addr ip)
 365 {
 366         struct sockaddr_in *sa = (struct sockaddr_in *)ss;
 367         memset(ss, '\0', sizeof(*ss));
 368         ss->ss_family = AF_INET;
 369         sa->sin_addr = ip;
 370 }
 371
 372 #if defined(HAVE_IPV6)
 373 /*******************************************************************
 374  Convert an IPv6 struct in_addr to a struct sockaddr_storage.
 375 ********************************************************************/
 376
 377  void in6_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
 378                 struct in6_addr ip)
 379 {
 380         struct sockaddr_in6 *sa = (struct sockaddr_in6 *)ss;
 381         memset(ss, '\0', sizeof(*ss));
 382         ss->ss_family = AF_INET6;
 383         sa->sin6_addr = ip;
 384 }
 385 #endif
 386
 387 /*******************************************************************
 388  Are two IPs on the same subnet?
 389 ********************************************************************/
 390
 391 bool same_net(const struct sockaddr_storage *ip1,
 392                 const struct sockaddr_storage *ip2,
 393                 const struct sockaddr_storage *mask)
 394 {
 395         if (ip1->ss_family != ip2->ss_family) {
 396                 /* Never on the same net. */
 397                 return false;
 398         }
 399
 400 #if defined(HAVE_IPV6)
 401         if (ip1->ss_family == AF_INET6) {
 402                 struct sockaddr_in6 ip1_6 = *(struct sockaddr_in6 *)ip1;
 403                 struct sockaddr_in6 ip2_6 = *(struct sockaddr_in6 *)ip2;
 404                 struct sockaddr_in6 mask_6 = *(struct sockaddr_in6 *)mask;
 405                 char *p1 = (char *)&ip1_6.sin6_addr;
 406                 char *p2 = (char *)&ip2_6.sin6_addr;
 407                 char *m = (char *)&mask_6.sin6_addr;
 408                 int i;
 409
 410                 for (i = 0; i < sizeof(struct in6_addr); i++) {
 411                         *p1++ &= *m;
 412                         *p2++ &= *m;
 413                         m++;
 414                 }
 415                 return (memcmp(&ip1_6.sin6_addr,
 416                                 &ip2_6.sin6_addr,
 417                                 sizeof(struct in6_addr)) == 0);
 418         }
 419 #endif
 420         if (ip1->ss_family == AF_INET) {
 421                 return same_net_v4(((const struct sockaddr_in *)ip1)->sin_addr,
 422                                 ((const struct sockaddr_in *)ip2)->sin_addr,
 423                                 ((const struct sockaddr_in *)mask)->sin_addr);
 424         }
 425         return false;
 426 }
 427
 428 /*******************************************************************
 429  Are two sockaddr_storage's the same family and address ? Ignore port etc.
 430 ********************************************************************/
 431
 432 bool addr_equal(const struct sockaddr_storage *ip1,
 433                 const struct sockaddr_storage *ip2)
 434 {
 435         if (ip1->ss_family != ip2->ss_family) {
 436                 /* Never the same. */
 437                 return false;
 438         }
 439
 440 #if defined(HAVE_IPV6)
 441         if (ip1->ss_family == AF_INET6) {
 442                 return (memcmp(&((const struct sockaddr_in6 *)ip1)->sin6_addr,
 443                                 &((const struct sockaddr_in6 *)ip2)->sin6_addr,
 444                                 sizeof(struct in6_addr)) == 0);
 445         }
 446 #endif
 447         if (ip1->ss_family == AF_INET) {
 448                 return (memcmp(&((const struct sockaddr_in *)ip1)->sin_addr,
 449                                 &((const struct sockaddr_in *)ip2)->sin_addr,
 450                                 sizeof(struct in_addr)) == 0);
 451         }
 452         return false;
 453 }
 454
 455 /****************************************************************************
 456  Is an IP address the INADDR_ANY or in6addr_any value ?
 457 ****************************************************************************/
 458
 459 bool is_address_any(const struct sockaddr_storage *psa)
 460 {
 461 #if defined(HAVE_IPV6)
 462         if (psa->ss_family == AF_INET6) {
 463                 struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)psa;
 464                 if (memcmp(&in6addr_any,
 465                                 &si6->sin6_addr,
 466                                 sizeof(in6addr_any)) == 0) {
 467                         return true;
 468                 }
 469                 return false;
 470         }
 471 #endif
 472         if (psa->ss_family == AF_INET) {
 473                 struct sockaddr_in *si = (struct sockaddr_in *)psa;
 474                 if (si->sin_addr.s_addr == INADDR_ANY) {
 475                         return true;
 476                 }
 477                 return false;
 478         }
 479         return false;
 480 }
 481
 482 /****************************************************************************
 483  Get a port number in host byte order from a sockaddr_storage.
 484 ****************************************************************************/
 485
 486 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
 487 {
 488         uint16_t port = 0;
 489
 490         if (pss->ss_family != AF_INET) {
 491 #if defined(HAVE_IPV6)
 492                 /* IPv6 */
 493                 const struct sockaddr_in6 *sa6 =
 494                         (const struct sockaddr_in6 *)pss;
 495                 port = ntohs(sa6->sin6_port);
 496 #endif
 497         } else {
 498                 const struct sockaddr_in *sa =
 499                         (const struct sockaddr_in *)pss;
 500                 port = ntohs(sa->sin_port);
 501         }
 502         return port;
 503 }
 504
 505 /****************************************************************************
 506  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
 507 ****************************************************************************/
 508
 509 static char *print_sockaddr_len(char *dest,
 510                         size_t destlen,
 511                         const struct sockaddr_storage *psa,
 512                         socklen_t psalen)
 513 {
 514         if (destlen > 0) {
 515                 dest[0] = '\0';
 516         }
 517         (void)sys_getnameinfo((const struct sockaddr *)psa,
 518                         psalen,
 519                         dest, destlen,
 520                         NULL, 0,
 521                         NI_NUMERICHOST);
 522         return dest;
 523 }
 524
 525 /****************************************************************************
 526  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
 527 ****************************************************************************/
 528
 529 char *print_sockaddr(char *dest,
 530                         size_t destlen,
 531                         const struct sockaddr_storage *psa)
 532 {
 533         return print_sockaddr_len(dest, destlen, psa,
 534                         sizeof(struct sockaddr_storage));
 535 }
 536
 537 /****************************************************************************
 538  Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
 539 ****************************************************************************/
 540
 541 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
 542                         const struct sockaddr_storage *pss)
 543 {
 544         char addr[INET6_ADDRSTRLEN];
 545         char *dest = NULL;
 546         int ret;
 547
 548         /* Linux getnameinfo() man pages says port is unitialized if
 549            service name is NULL. */
 550
 551         ret = sys_getnameinfo((const struct sockaddr *)pss,
 552                         sizeof(struct sockaddr_storage),
 553                         addr, sizeof(addr),
 554                         NULL, 0,
 555                         NI_NUMERICHOST);
 556         if (ret != 0) {
 557                 return NULL;
 558         }
 559
 560         if (pss->ss_family != AF_INET) {
 561 #if defined(HAVE_IPV6)
 562                 dest = talloc_asprintf(ctx, "[%s]", addr);
 563 #else
 564                 return NULL;
 565 #endif
 566         } else {
 567                 dest = talloc_asprintf(ctx, "%s", addr);
 568         }
 569
 570         return dest;
 571 }
 572
 573 /****************************************************************************
 574  Return the string of an IP address (IPv4 or IPv6).
 575 ****************************************************************************/
 576
 577 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
 578 {
 579         struct sockaddr_storage sa;
 580         socklen_t length = sizeof(sa);
 581
 582         /* Ok, returning a hard coded IPv4 address
 583          * is bogus, but it's just as bogus as a
 584          * zero IPv6 address. No good choice here.
 585          */
 586
 587         strlcpy(addr_buf, "0.0.0.0", addr_len);
 588
 589         if (fd == -1) {
 590                 return addr_buf;
 591         }
 592
 593         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 594                 DEBUG(0,("getsockname failed. Error was %s\n",
 595                         strerror(errno) ));
 596                 return addr_buf;
 597         }
 598
 599         return print_sockaddr_len(addr_buf, addr_len, &sa, length);
 600 }
 601
 602 #if 0
 603 /* Not currently used. JRA. */
 604 /****************************************************************************
 605  Return the port number we've bound to on a socket.
 606 ****************************************************************************/
 607
 608 static int get_socket_port(int fd)
 609 {
 610         struct sockaddr_storage sa;
 611         socklen_t length = sizeof(sa);
 612
 613         if (fd == -1) {
 614                 return -1;
 615         }
 616
 617         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 618                 DEBUG(0,("getpeername failed. Error was %s\n",
 619                         strerror(errno) ));
 620                 return -1;
 621         }
 622
 623 #if defined(HAVE_IPV6)
 624         if (sa.ss_family == AF_INET6) {
 625                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
 626         }
 627 #endif
 628         if (sa.ss_family == AF_INET) {
 629                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
 630         }
 631         return -1;
 632 }
 633 #endif
 634
 635 void set_sockaddr_port(struct sockaddr_storage *psa, uint16 port)
 636 {
 637 #if defined(HAVE_IPV6)
 638         if (psa->ss_family == AF_INET6) {
 639                 ((struct sockaddr_in6 *)psa)->sin6_port = htons(port);
 640         }
 641 #endif
 642         if (psa->ss_family == AF_INET) {
 643                 ((struct sockaddr_in *)psa)->sin_port = htons(port);
 644         }
 645 }
 646
 647 const char *client_name(int fd)
 648 {
 649         return get_peer_name(fd,false);
 650 }
 651
 652 const char *client_addr(int fd, char *addr, size_t addrlen)
 653 {
 654         return get_peer_addr(fd,addr,addrlen);
 655 }
 656
 657 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
 658 {
 659         return get_socket_addr(fd, addr, addr_len);
 660 }
 661
 662 #if 0
 663 /* Not currently used. JRA. */
 664 int client_socket_port(int fd)
 665 {
 666         return get_socket_port(fd);
 667 }
 668 #endif
 669
 670 /****************************************************************************
 671  Accessor functions to make thread-safe code easier later...
 672 ****************************************************************************/
 673
 674 void set_smb_read_error(enum smb_read_errors *pre,
 675                         enum smb_read_errors newerr)
 676 {
 677         if (pre) {
 678                 *pre = newerr;
 679         }
 680 }
 681
 682 void cond_set_smb_read_error(enum smb_read_errors *pre,
 683                         enum smb_read_errors newerr)
 684 {
 685         if (pre && *pre == SMB_READ_OK) {
 686                 *pre = newerr;
 687         }
 688 }
 689
 690 /****************************************************************************
 691  Determine if a file descriptor is in fact a socket.
 692 ****************************************************************************/
 693
 694 bool is_a_socket(int fd)
 695 {
 696         int v;
 697         socklen_t l;
 698         l = sizeof(int);
 699         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
 700 }
 701
 702 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
 703
 704 typedef struct smb_socket_option {
 705         const char *name;
 706         int level;
 707         int option;
 708         int value;
 709         int opttype;
 710 } smb_socket_option;
 711
 712 static const smb_socket_option socket_options[] = {
 713   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
 714   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
 715   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
 716 #ifdef TCP_NODELAY
 717   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
 718 #endif
 719 #ifdef TCP_KEEPCNT
 720   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
 721 #endif
 722 #ifdef TCP_KEEPIDLE
 723   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
 724 #endif
 725 #ifdef TCP_KEEPINTVL
 726   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
 727 #endif
 728 #ifdef IPTOS_LOWDELAY
 729   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
 730 #endif
 731 #ifdef IPTOS_THROUGHPUT
 732   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
 733 #endif
 734 #ifdef SO_REUSEPORT
 735   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
 736 #endif
 737 #ifdef SO_SNDBUF
 738   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
 739 #endif
 740 #ifdef SO_RCVBUF
 741   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
 742 #endif
 743 #ifdef SO_SNDLOWAT
 744   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
 745 #endif
 746 #ifdef SO_RCVLOWAT
 747   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
 748 #endif
 749 #ifdef SO_SNDTIMEO
 750   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
 751 #endif
 752 #ifdef SO_RCVTIMEO
 753   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
 754 #endif
 755 #ifdef TCP_FASTACK
 756   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
 757 #endif
 758   {NULL,0,0,0,0}};
 759
 760 /****************************************************************************
 761  Print socket options.
 762 ****************************************************************************/
 763
 764 static void print_socket_options(int s)
 765 {
 766         int value;
 767         socklen_t vlen = 4;
 768         const smb_socket_option *p = &socket_options[0];
 769
 770         /* wrapped in if statement to prevent streams
 771          * leak in SCO Openserver 5.0 */
 772         /* reported on samba-technical  --jerry */
 773         if ( DEBUGLEVEL >= 5 ) {
 774                 for (; p->name != NULL; p++) {
 775                         if (getsockopt(s, p->level, p->option,
 776                                                 (void *)&value, &vlen) == -1) {
 777                                 DEBUG(5,("Could not test socket option %s.\n",
 778                                                         p->name));
 779                         } else {
 780                                 DEBUG(5,("socket option %s = %d\n",
 781                                                         p->name,value));
 782                         }
 783                 }
 784         }
 785  }
 786
 787 /****************************************************************************
 788  Set user socket options.
 789 ****************************************************************************/
 790
 791 void set_socket_options(int fd, const char *options)
 792 {
 793         TALLOC_CTX *ctx = talloc_stackframe();
 794         char *tok;
 795
 796         while (next_token_talloc(ctx, &options, &tok," \t,")) {
 797                 int ret=0,i;
 798                 int value = 1;
 799                 char *p;
 800                 bool got_value = false;
 801
 802                 if ((p = strchr_m(tok,'='))) {
 803                         *p = 0;
 804                         value = atoi(p+1);
 805                         got_value = true;
 806                 }
 807
 808                 for (i=0;socket_options[i].name;i++)
 809                         if (strequal(socket_options[i].name,tok))
 810                                 break;
 811
 812                 if (!socket_options[i].name) {
 813                         DEBUG(0,("Unknown socket option %s\n",tok));
 814                         continue;
 815                 }
 816
 817                 switch (socket_options[i].opttype) {
 818                 case OPT_BOOL:
 819                 case OPT_INT:
 820                         ret = setsockopt(fd,socket_options[i].level,
 821                                         socket_options[i].option,
 822                                         (char *)&value,sizeof(int));
 823                         break;
 824
 825                 case OPT_ON:
 826                         if (got_value)
 827                                 DEBUG(0,("syntax error - %s "
 828                                         "does not take a value\n",tok));
 829
 830                         {
 831                                 int on = socket_options[i].value;
 832                                 ret = setsockopt(fd,socket_options[i].level,
 833                                         socket_options[i].option,
 834                                         (char *)&on,sizeof(int));
 835                         }
 836                         break;
 837                 }
 838
 839                 if (ret != 0) {
 840                         DEBUG(0,("Failed to set socket option %s (Error %s)\n",
 841                                 tok, strerror(errno) ));
 842                 }
 843         }
 844
 845         TALLOC_FREE(ctx);
 846         print_socket_options(fd);
 847 }
 848
 849 /****************************************************************************
 850  Read from a socket.
 851 ****************************************************************************/
 852
 853 ssize_t read_udp_v4_socket(int fd,
 854                         char *buf,
 855                         size_t len,
 856                         struct sockaddr_storage *psa)
 857 {
 858         ssize_t ret;
 859         socklen_t socklen = sizeof(*psa);
 860         struct sockaddr_in *si = (struct sockaddr_in *)psa;
 861
 862         memset((char *)psa,'\0',socklen);
 863
 864         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
 865                         (struct sockaddr *)psa,&socklen);
 866         if (ret <= 0) {
 867                 /* Don't print a low debug error for a non-blocking socket. */
 868                 if (errno == EAGAIN) {
 869                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 870                 } else {
 871                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 872                                 strerror(errno)));
 873                 }
 874                 return 0;
 875         }
 876
 877         if (psa->ss_family != AF_INET) {
 878                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 879                         "(not IPv4)\n", (int)psa->ss_family));
 880                 return 0;
 881         }
 882
 883         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 884                         inet_ntoa(si->sin_addr),
 885                         si->sin_port,
 886                         (unsigned long)ret));
 887
 888         return ret;
 889 }
 890
 891 /****************************************************************************
 892  Read data from a socket with a timout in msec.
 893  mincount = if timeout, minimum to read before returning
 894  maxcount = number to be read.
 895  time_out = timeout in milliseconds
 896 ****************************************************************************/
 897
 898 NTSTATUS read_socket_with_timeout(int fd, char *buf,
 899                                   size_t mincnt, size_t maxcnt,
 900                                   unsigned int time_out,
 901                                   size_t *size_ret)
 902 {
 903         fd_set fds;
 904         int selrtn;
 905         ssize_t readret;
 906         size_t nread = 0;
 907         struct timeval timeout;
 908         char addr[INET6_ADDRSTRLEN];
 909
 910         /* just checking .... */
 911         if (maxcnt <= 0)
 912                 return NT_STATUS_OK;
 913
 914         /* Blocking read */
 915         if (time_out == 0) {
 916                 if (mincnt == 0) {
 917                         mincnt = maxcnt;
 918                 }
 919
 920                 while (nread < mincnt) {
 921                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 922
 923                         if (readret == 0) {
 924                                 DEBUG(5,("read_socket_with_timeout: "
 925                                         "blocking read. EOF from client.\n"));
 926                                 return NT_STATUS_END_OF_FILE;
 927                         }
 928
 929                         if (readret == -1) {
 930                                 if (fd == get_client_fd()) {
 931                                         /* Try and give an error message
 932                                          * saying what client failed. */
 933                                         DEBUG(0,("read_socket_with_timeout: "
 934                                                 "client %s read error = %s.\n",
 935                                                 get_peer_addr(fd,addr,sizeof(addr)),
 936                                                 strerror(errno) ));
 937                                 } else {
 938                                         DEBUG(0,("read_socket_with_timeout: "
 939                                                 "read error = %s.\n",
 940                                                 strerror(errno) ));
 941                                 }
 942                                 return map_nt_error_from_unix(errno);
 943                         }
 944                         nread += readret;
 945                 }
 946                 goto done;
 947         }
 948
 949         /* Most difficult - timeout read */
 950         /* If this is ever called on a disk file and
 951            mincnt is greater then the filesize then
 952            system performance will suffer severely as
 953            select always returns true on disk files */
 954
 955         /* Set initial timeout */
 956         timeout.tv_sec = (time_t)(time_out / 1000);
 957         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 958
 959         for (nread=0; nread < mincnt; ) {
 960                 FD_ZERO(&fds);
 961                 FD_SET(fd,&fds);
 962
 963                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 964
 965                 /* Check if error */
 966                 if (selrtn == -1) {
 967                         /* something is wrong. Maybe the socket is dead? */
 968                         if (fd == get_client_fd()) {
 969                                 /* Try and give an error message saying
 970                                  * what client failed. */
 971                                 DEBUG(0,("read_socket_with_timeout: timeout "
 972                                 "read for client %s. select error = %s.\n",
 973                                 get_peer_addr(fd,addr,sizeof(addr)),
 974                                 strerror(errno) ));
 975                         } else {
 976                                 DEBUG(0,("read_socket_with_timeout: timeout "
 977                                 "read. select error = %s.\n",
 978                                 strerror(errno) ));
 979                         }
 980                         return map_nt_error_from_unix(errno);
 981                 }
 982
 983                 /* Did we timeout ? */
 984                 if (selrtn == 0) {
 985                         DEBUG(10,("read_socket_with_timeout: timeout read. "
 986                                 "select timed out.\n"));
 987                         return NT_STATUS_IO_TIMEOUT;
 988                 }
 989
 990                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 991
 992                 if (readret == 0) {
 993                         /* we got EOF on the file descriptor */
 994                         DEBUG(5,("read_socket_with_timeout: timeout read. "
 995                                 "EOF from client.\n"));
 996                         return NT_STATUS_END_OF_FILE;
 997                 }
 998
 999                 if (readret == -1) {
1000                         /* the descriptor is probably dead */
1001                         if (fd == get_client_fd()) {
1002                                 /* Try and give an error message
1003                                  * saying what client failed. */
1004                                 DEBUG(0,("read_socket_with_timeout: timeout "
1005                                         "read to client %s. read error = %s.\n",
1006                                         get_peer_addr(fd,addr,sizeof(addr)),
1007                                         strerror(errno) ));
1008                         } else {
1009                                 DEBUG(0,("read_socket_with_timeout: timeout "
1010                                         "read. read error = %s.\n",
1011                                         strerror(errno) ));
1012                         }
1013                         return map_nt_error_from_unix(errno);
1014                 }
1015
1016                 nread += readret;
1017         }
1018
1019  done:
1020         /* Return the number we got */
1021         if (size_ret) {
1022                 *size_ret = nread;
1023         }
1024         return NT_STATUS_OK;
1025 }
1026
1027 /****************************************************************************
1028  Read data from the client, reading exactly N bytes.
1029 ****************************************************************************/
1030
1031 NTSTATUS read_data(int fd, char *buffer, size_t N)
1032 {
1033         return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
1034 }
1035
1036 /****************************************************************************
1037  Write data to a fd.
1038 ****************************************************************************/
1039
1040 ssize_t write_data(int fd, const char *buffer, size_t N)
1041 {
1042         size_t total=0;
1043         ssize_t ret;
1044         char addr[INET6_ADDRSTRLEN];
1045
1046         while (total < N) {
1047                 ret = sys_write(fd,buffer + total,N - total);
1048
1049                 if (ret == -1) {
1050                         if (fd == get_client_fd()) {
1051                                 /* Try and give an error message saying
1052                                  * what client failed. */
1053                                 DEBUG(0,("write_data: write failure in "
1054                                         "writing to client %s. Error %s\n",
1055                                         get_peer_addr(fd,addr,sizeof(addr)),
1056                                         strerror(errno) ));
1057                         } else {
1058                                 DEBUG(0,("write_data: write failure. "
1059                                         "Error = %s\n", strerror(errno) ));
1060                         }
1061                         return -1;
1062                 }
1063
1064                 if (ret == 0) {
1065                         return total;
1066                 }
1067
1068                 total += ret;
1069         }
1070         return (ssize_t)total;
1071 }
1072
1073 /****************************************************************************
1074  Send a keepalive packet (rfc1002).
1075 ****************************************************************************/
1076
1077 bool send_keepalive(int client)
1078 {
1079         unsigned char buf[4];
1080
1081         buf[0] = SMBkeepalive;
1082         buf[1] = buf[2] = buf[3] = 0;
1083
1084         return(write_data(client,(char *)buf,4) == 4);
1085 }
1086
1087 /****************************************************************************
1088  Read 4 bytes of a smb packet and return the smb length of the packet.
1089  Store the result in the buffer.
1090  This version of the function will return a length of zero on receiving
1091  a keepalive packet.
1092  Timeout is in milliseconds.
1093 ****************************************************************************/
1094
1095 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
1096                                           unsigned int timeout,
1097                                           size_t *len)
1098 {
1099         int msg_type;
1100         NTSTATUS status;
1101
1102         status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
1103
1104         if (!NT_STATUS_IS_OK(status)) {
1105                 return status;
1106         }
1107
1108         *len = smb_len(inbuf);
1109         msg_type = CVAL(inbuf,0);
1110
1111         if (msg_type == SMBkeepalive) {
1112                 DEBUG(5,("Got keepalive packet\n"));
1113         }
1114
1115         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
1116
1117         return NT_STATUS_OK;
1118 }
1119
1120 /****************************************************************************
1121  Read 4 bytes of a smb packet and return the smb length of the packet.
1122  Store the result in the buffer. This version of the function will
1123  never return a session keepalive (length of zero).
1124  Timeout is in milliseconds.
1125 ****************************************************************************/
1126
1127 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
1128                          size_t *len)
1129 {
1130         uint8_t msgtype = SMBkeepalive;
1131
1132         while (msgtype == SMBkeepalive) {
1133                 NTSTATUS status;
1134
1135                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
1136                                                           len);
1137                 if (!NT_STATUS_IS_OK(status)) {
1138                         return status;
1139                 }
1140
1141                 msgtype = CVAL(inbuf, 0);
1142         }
1143
1144         DEBUG(10,("read_smb_length: got smb length of %lu\n",
1145                   (unsigned long)len));
1146
1147         return NT_STATUS_OK;
1148 }
1149
1150 /****************************************************************************
1151  Read an smb from a fd. Note that the buffer *MUST* be of size
1152  BUFFER_SIZE+SAFETY_MARGIN.
1153  The timeout is in milliseconds.
1154  This function will return on receipt of a session keepalive packet.
1155  maxlen is the max number of bytes to return, not including the 4 byte
1156  length. If zero it means BUFFER_SIZE+SAFETY_MARGIN limit.
1157  Doesn't check the MAC on signed packets.
1158 ****************************************************************************/
1159
1160 NTSTATUS receive_smb_raw(int fd, char *buffer, unsigned int timeout,
1161                          size_t maxlen, size_t *p_len)
1162 {
1163         size_t len;
1164         NTSTATUS status;
1165
1166         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
1167
1168         if (!NT_STATUS_IS_OK(status)) {
1169                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
1170                 return status;
1171         }
1172
1173         /*
1174          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
1175          * of header. Don't print the error if this fits.... JRA.
1176          */
1177
1178         if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
1179                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
1180                                         (unsigned long)len));
1181                 if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
1182                         return NT_STATUS_INVALID_PARAMETER;
1183                 }
1184         }
1185
1186         if(len > 0) {
1187                 if (maxlen) {
1188                         len = MIN(len,maxlen);
1189                 }
1190
1191                 status = read_socket_with_timeout(
1192                         fd, buffer+4, len, len, timeout, &len);
1193
1194                 if (!NT_STATUS_IS_OK(status)) {
1195                         return status;
1196                 }
1197
1198                 /* not all of samba3 properly checks for packet-termination
1199                  * of strings. This ensures that we don't run off into
1200                  * empty space. */
1201                 SSVAL(buffer+4,len, 0);
1202         }
1203
1204         *p_len = len;
1205         return NT_STATUS_OK;
1206 }
1207
1208 /****************************************************************************
1209  Open a socket of the specified type, port, and address for incoming data.
1210 ****************************************************************************/
1211
1212 int open_socket_in(int type,
1213                 uint16_t port,
1214                 int dlevel,
1215                 const struct sockaddr_storage *psock,
1216                 bool rebind)
1217 {
1218         struct sockaddr_storage sock;
1219         int res;
1220         socklen_t slen = sizeof(struct sockaddr_in);
1221
1222         sock = *psock;
1223
1224 #if defined(HAVE_IPV6)
1225         if (sock.ss_family == AF_INET6) {
1226                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
1227                 slen = sizeof(struct sockaddr_in6);
1228         }
1229 #endif
1230         if (sock.ss_family == AF_INET) {
1231                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
1232         }
1233
1234         res = socket(sock.ss_family, type, 0 );
1235         if( res == -1 ) {
1236                 if( DEBUGLVL(0) ) {
1237                         dbgtext( "open_socket_in(): socket() call failed: " );
1238                         dbgtext( "%s\n", strerror( errno ) );
1239                 }
1240                 return -1;
1241         }
1242
1243         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
1244         {
1245                 int val = rebind ? 1 : 0;
1246                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
1247                                         (char *)&val,sizeof(val)) == -1 ) {
1248                         if( DEBUGLVL( dlevel ) ) {
1249                                 dbgtext( "open_socket_in(): setsockopt: " );
1250                                 dbgtext( "SO_REUSEADDR = %s ",
1251                                                 val?"true":"false" );
1252                                 dbgtext( "on port %d failed ", port );
1253                                 dbgtext( "with error = %s\n", strerror(errno) );
1254                         }
1255                 }
1256 #ifdef SO_REUSEPORT
1257                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
1258                                         (char *)&val,sizeof(val)) == -1 ) {
1259                         if( DEBUGLVL( dlevel ) ) {
1260                                 dbgtext( "open_socket_in(): setsockopt: ");
1261                                 dbgtext( "SO_REUSEPORT = %s ",
1262                                                 val?"true":"false");
1263                                 dbgtext( "on port %d failed ", port);
1264                                 dbgtext( "with error = %s\n", strerror(errno));
1265                         }
1266                 }
1267 #endif /* SO_REUSEPORT */
1268         }
1269
1270         /* now we've got a socket - we need to bind it */
1271         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
1272                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
1273                                 port == SMB_PORT2 || port == NMB_PORT) ) {
1274                         char addr[INET6_ADDRSTRLEN];
1275                         print_sockaddr(addr, sizeof(addr),
1276                                         &sock);
1277                         dbgtext( "bind failed on port %d ", port);
1278                         dbgtext( "socket_addr = %s.\n", addr);
1279                         dbgtext( "Error = %s\n", strerror(errno));
1280                 }
1281                 close(res);
1282                 return -1;
1283         }
1284
1285         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
1286         return( res );
1287  }
1288
1289 /****************************************************************************
1290  Create an outgoing socket. timeout is in milliseconds.
1291 **************************************************************************/
1292
1293 int open_socket_out(int type,
1294                 const struct sockaddr_storage *pss,
1295                 uint16_t port,
1296                 int timeout)
1297 {
1298         char addr[INET6_ADDRSTRLEN];
1299         struct sockaddr_storage sock_out = *pss;
1300         int res,ret;
1301         int connect_loop = 10;
1302         int increment = 10;
1303
1304         /* create a socket to write to */
1305         res = socket(pss->ss_family, type, 0);
1306         if (res == -1) {
1307                 DEBUG(0,("socket error (%s)\n", strerror(errno)));
1308                 return -1;
1309         }
1310
1311         if (type != SOCK_STREAM) {
1312                 return res;
1313         }
1314
1315 #if defined(HAVE_IPV6)
1316         if (pss->ss_family == AF_INET6) {
1317                 struct sockaddr_in6 *psa6 = (struct sockaddr_in6 *)&sock_out;
1318                 psa6->sin6_port = htons(port);
1319                 if (psa6->sin6_scope_id == 0 &&
1320                                 IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1321                         setup_linklocal_scope_id(&sock_out);
1322                 }
1323         }
1324 #endif
1325         if (pss->ss_family == AF_INET) {
1326                 struct sockaddr_in *psa = (struct sockaddr_in *)&sock_out;
1327                 psa->sin_port = htons(port);
1328         }
1329
1330         /* set it non-blocking */
1331         set_blocking(res,false);
1332
1333         print_sockaddr(addr, sizeof(addr), &sock_out);
1334         DEBUG(3,("Connecting to %s at port %u\n",
1335                                 addr,
1336                                 (unsigned int)port));
1337
1338         /* and connect it to the destination */
1339   connect_again:
1340
1341         ret = sys_connect(res, (struct sockaddr *)&sock_out);
1342
1343         /* Some systems return EAGAIN when they mean EINPROGRESS */
1344         if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1345                         errno == EAGAIN) && (connect_loop < timeout) ) {
1346                 smb_msleep(connect_loop);
1347                 timeout -= connect_loop;
1348                 connect_loop += increment;
1349                 if (increment < 250) {
1350                         /* After 8 rounds we end up at a max of 255 msec */
1351                         increment *= 1.5;
1352                 }
1353                 goto connect_again;
1354         }
1355
1356         if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1357                         errno == EAGAIN)) {
1358                 DEBUG(1,("timeout connecting to %s:%u\n",
1359                                         addr,
1360                                         (unsigned int)port));
1361                 close(res);
1362                 return -1;
1363         }
1364
1365 #ifdef EISCONN
1366         if (ret < 0 && errno == EISCONN) {
1367                 errno = 0;
1368                 ret = 0;
1369         }
1370 #endif
1371
1372         if (ret < 0) {
1373                 DEBUG(2,("error connecting to %s:%d (%s)\n",
1374                                 addr,
1375                                 (unsigned int)port,
1376                                 strerror(errno)));
1377                 close(res);
1378                 return -1;
1379         }
1380
1381         /* set it blocking again */
1382         set_blocking(res,true);
1383
1384         return res;
1385 }
1386
1387 /****************************************************************************
1388  Create an outgoing TCP socket to any of the addrs. This is for
1389  simultaneous connects to port 445 and 139 of a host or even a variety
1390  of DC's all of which are equivalent for our purposes.
1391 **************************************************************************/
1392
1393 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1394                          int timeout, int *fd_index, int *fd)
1395 {
1396         int i, resulting_index, res;
1397         int *sockets;
1398         bool good_connect;
1399
1400         fd_set r_fds, wr_fds;
1401         struct timeval tv;
1402         int maxfd;
1403
1404         int connect_loop = 10000; /* 10 milliseconds */
1405
1406         timeout *= 1000;        /* convert to microseconds */
1407
1408         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1409
1410         if (sockets == NULL)
1411                 return false;
1412
1413         resulting_index = -1;
1414
1415         for (i=0; i<num_addrs; i++)
1416                 sockets[i] = -1;
1417
1418         for (i=0; i<num_addrs; i++) {
1419                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1420                 if (sockets[i] < 0)
1421                         goto done;
1422                 set_blocking(sockets[i], false);
1423         }
1424
1425  connect_again:
1426         good_connect = false;
1427
1428         for (i=0; i<num_addrs; i++) {
1429                 const struct sockaddr * a =
1430                     (const struct sockaddr *)&(addrs[i]);
1431
1432                 if (sockets[i] == -1)
1433                         continue;
1434
1435                 if (sys_connect(sockets[i], a) == 0) {
1436                         /* Rather unlikely as we are non-blocking, but it
1437                          * might actually happen. */
1438                         resulting_index = i;
1439                         goto done;
1440                 }
1441
1442                 if (errno == EINPROGRESS || errno == EALREADY ||
1443 #ifdef EISCONN
1444                         errno == EISCONN ||
1445 #endif
1446                     errno == EAGAIN || errno == EINTR) {
1447                         /* These are the error messages that something is
1448                            progressing. */
1449                         good_connect = true;
1450                 } else if (errno != 0) {
1451                         /* There was a direct error */
1452                         close(sockets[i]);
1453                         sockets[i] = -1;
1454                 }
1455         }
1456
1457         if (!good_connect) {
1458                 /* All of the connect's resulted in real error conditions */
1459                 goto done;
1460         }
1461
1462         /* Lets see if any of the connect attempts succeeded */
1463
1464         maxfd = 0;
1465         FD_ZERO(&wr_fds);
1466         FD_ZERO(&r_fds);
1467
1468         for (i=0; i<num_addrs; i++) {
1469                 if (sockets[i] == -1)
1470                         continue;
1471                 FD_SET(sockets[i], &wr_fds);
1472                 FD_SET(sockets[i], &r_fds);
1473                 if (sockets[i]>maxfd)
1474                         maxfd = sockets[i];
1475         }
1476
1477         tv.tv_sec = 0;
1478         tv.tv_usec = connect_loop;
1479
1480         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1481
1482         if (res < 0)
1483                 goto done;
1484
1485         if (res == 0)
1486                 goto next_round;
1487
1488         for (i=0; i<num_addrs; i++) {
1489
1490                 if (sockets[i] == -1)
1491                         continue;
1492
1493                 /* Stevens, Network Programming says that if there's a
1494                  * successful connect, the socket is only writable. Upon an
1495                  * error, it's both readable and writable. */
1496
1497                 if (FD_ISSET(sockets[i], &r_fds) &&
1498                     FD_ISSET(sockets[i], &wr_fds)) {
1499                         /* readable and writable, so it's an error */
1500                         close(sockets[i]);
1501                         sockets[i] = -1;
1502                         continue;
1503                 }
1504
1505                 if (!FD_ISSET(sockets[i], &r_fds) &&
1506                     FD_ISSET(sockets[i], &wr_fds)) {
1507                         /* Only writable, so it's connected */
1508                         resulting_index = i;
1509                         goto done;
1510                 }
1511         }
1512
1513  next_round:
1514
1515         timeout -= connect_loop;
1516         if (timeout <= 0)
1517                 goto done;
1518         connect_loop *= 1.5;
1519         if (connect_loop > timeout)
1520                 connect_loop = timeout;
1521         goto connect_again;
1522
1523  done:
1524         for (i=0; i<num_addrs; i++) {
1525                 if (i == resulting_index)
1526                         continue;
1527                 if (sockets[i] >= 0)
1528                         close(sockets[i]);
1529         }
1530
1531         if (resulting_index >= 0) {
1532                 *fd_index = resulting_index;
1533                 *fd = sockets[*fd_index];
1534                 set_blocking(*fd, true);
1535         }
1536
1537         free(sockets);
1538
1539         return (resulting_index >= 0);
1540 }
1541 /****************************************************************************
1542  Open a connected UDP socket to host on port
1543 **************************************************************************/
1544
1545 int open_udp_socket(const char *host, int port)
1546 {
1547         int type = SOCK_DGRAM;
1548         struct sockaddr_in sock_out;
1549         int res;
1550         struct in_addr addr;
1551
1552         (void)interpret_addr2(&addr, host);
1553
1554         res = socket(PF_INET, type, 0);
1555         if (res == -1) {
1556                 return -1;
1557         }
1558
1559         memset((char *)&sock_out,'\0',sizeof(sock_out));
1560         putip((char *)&sock_out.sin_addr,(char *)&addr);
1561         sock_out.sin_port = htons(port);
1562         sock_out.sin_family = PF_INET;
1563
1564         if (sys_connect(res,(struct sockaddr *)&sock_out)) {
1565                 close(res);
1566                 return -1;
1567         }
1568
1569         return res;
1570 }
1571
1572 /*******************************************************************
1573  Return the IP addr of the remote end of a socket as a string.
1574  Optionally return the struct sockaddr_storage.
1575  ******************************************************************/
1576
1577 static const char *get_peer_addr_internal(int fd,
1578                                 char *addr_buf,
1579                                 size_t addr_buf_len,
1580                                 struct sockaddr_storage *pss,
1581                                 socklen_t *plength)
1582 {
1583         struct sockaddr_storage ss;
1584         socklen_t length = sizeof(ss);
1585
1586         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1587
1588         if (fd == -1) {
1589                 return addr_buf;
1590         }
1591
1592         if (pss == NULL) {
1593                 pss = &ss;
1594         }
1595         if (plength == NULL) {
1596                 plength = &length;
1597         }
1598
1599         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1600                 DEBUG(0,("getpeername failed. Error was %s\n",
1601                                         strerror(errno) ));
1602                 return addr_buf;
1603         }
1604
1605         print_sockaddr_len(addr_buf,
1606                         addr_buf_len,
1607                         pss,
1608                         *plength);
1609         return addr_buf;
1610 }
1611
1612 /*******************************************************************
1613  Matchname - determine if host name matches IP address. Used to
1614  confirm a hostname lookup to prevent spoof attacks.
1615 ******************************************************************/
1616
1617 static bool matchname(const char *remotehost,
1618                 const struct sockaddr_storage *pss,
1619                 socklen_t len)
1620 {
1621         struct addrinfo *res = NULL;
1622         struct addrinfo *ailist = NULL;
1623         char addr_buf[INET6_ADDRSTRLEN];
1624         bool ret = interpret_string_addr_internal(&ailist,
1625                         remotehost,
1626                         AI_ADDRCONFIG|AI_CANONNAME);
1627
1628         if (!ret || ailist == NULL) {
1629                 DEBUG(3,("matchname: getaddrinfo failed for "
1630                         "name %s [%s]\n",
1631                         remotehost,
1632                         gai_strerror(ret) ));
1633                 return false;
1634         }
1635
1636         /*
1637          * Make sure that getaddrinfo() returns the "correct" host name.
1638          */
1639
1640         if (ailist->ai_canonname == NULL ||
1641                 (!strequal(remotehost, ailist->ai_canonname) &&
1642                  !strequal(remotehost, "localhost"))) {
1643                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1644                          remotehost,
1645                          ailist->ai_canonname ?
1646                                  ailist->ai_canonname : "(NULL)"));
1647                 freeaddrinfo(ailist);
1648                 return false;
1649         }
1650
1651         /* Look up the host address in the address list we just got. */
1652         for (res = ailist; res; res = res->ai_next) {
1653                 if (!res->ai_addr) {
1654                         continue;
1655                 }
1656                 if (addr_equal((const struct sockaddr_storage *)res->ai_addr,
1657                                         pss)) {
1658                         freeaddrinfo(ailist);
1659                         return true;
1660                 }
1661         }
1662
1663         /*
1664          * The host name does not map to the original host address. Perhaps
1665          * someone has compromised a name server. More likely someone botched
1666          * it, but that could be dangerous, too.
1667          */
1668
1669         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1670                 print_sockaddr_len(addr_buf,
1671                         sizeof(addr_buf),
1672                         pss,
1673                         len),
1674                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1675
1676         if (ailist) {
1677                 freeaddrinfo(ailist);
1678         }
1679         return false;
1680 }
1681
1682 /*******************************************************************
1683  Deal with the singleton cache.
1684 ******************************************************************/
1685
1686 struct name_addr_pair {
1687         struct sockaddr_storage ss;
1688         const char *name;
1689 };
1690
1691 /*******************************************************************
1692  Lookup a name/addr pair. Returns memory allocated from memcache.
1693 ******************************************************************/
1694
1695 static bool lookup_nc(struct name_addr_pair *nc)
1696 {
1697         DATA_BLOB tmp;
1698
1699         ZERO_STRUCTP(nc);
1700
1701         if (!memcache_lookup(
1702                         NULL, SINGLETON_CACHE,
1703                         data_blob_string_const("get_peer_name"),
1704                         &tmp)) {
1705                 return false;
1706         }
1707
1708         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1709         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1710         return true;
1711 }
1712
1713 /*******************************************************************
1714  Save a name/addr pair.
1715 ******************************************************************/
1716
1717 static void store_nc(const struct name_addr_pair *nc)
1718 {
1719         DATA_BLOB tmp;
1720         size_t namelen = strlen(nc->name);
1721
1722         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1723         if (!tmp.data) {
1724                 return;
1725         }
1726         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1727         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1728
1729         memcache_add(NULL, SINGLETON_CACHE,
1730                         data_blob_string_const("get_peer_name"),
1731                         tmp);
1732         data_blob_free(&tmp);
1733 }
1734
1735 /*******************************************************************
1736  Return the DNS name of the remote end of a socket.
1737 ******************************************************************/
1738
1739 const char *get_peer_name(int fd, bool force_lookup)
1740 {
1741         struct name_addr_pair nc;
1742         char addr_buf[INET6_ADDRSTRLEN];
1743         struct sockaddr_storage ss;
1744         socklen_t length = sizeof(ss);
1745         const char *p;
1746         int ret;
1747         char name_buf[MAX_DNS_NAME_LENGTH];
1748         char tmp_name[MAX_DNS_NAME_LENGTH];
1749
1750         /* reverse lookups can be *very* expensive, and in many
1751            situations won't work because many networks don't link dhcp
1752            with dns. To avoid the delay we avoid the lookup if
1753            possible */
1754         if (!lp_hostname_lookups() && (force_lookup == false)) {
1755                 length = sizeof(nc.ss);
1756                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1757                         &nc.ss, &length);
1758                 store_nc(&nc);
1759                 lookup_nc(&nc);
1760                 return nc.name ? nc.name : "UNKNOWN";
1761         }
1762
1763         lookup_nc(&nc);
1764
1765         memset(&ss, '\0', sizeof(ss));
1766         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), &ss, &length);
1767
1768         /* it might be the same as the last one - save some DNS work */
1769         if (addr_equal(&ss, &nc.ss)) {
1770                 return nc.name ? nc.name : "UNKNOWN";
1771         }
1772
1773         /* Not the same. We need to lookup. */
1774         if (fd == -1) {
1775                 return "UNKNOWN";
1776         }
1777
1778         /* Look up the remote host name. */
1779         ret = sys_getnameinfo((struct sockaddr *)&ss,
1780                         length,
1781                         name_buf,
1782                         sizeof(name_buf),
1783                         NULL,
1784                         0,
1785                         0);
1786
1787         if (ret) {
1788                 DEBUG(1,("get_peer_name: getnameinfo failed "
1789                         "for %s with error %s\n",
1790                         p,
1791                         gai_strerror(ret)));
1792                 strlcpy(name_buf, p, sizeof(name_buf));
1793         } else {
1794                 if (!matchname(name_buf, &ss, length)) {
1795                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1796                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1797                 }
1798         }
1799
1800         /* can't pass the same source and dest strings in when you
1801            use --enable-developer or the clobber_region() call will
1802            get you */
1803
1804         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1805         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1806         if (strstr(name_buf,"..")) {
1807                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1808         }
1809
1810         nc.name = name_buf;
1811         nc.ss = ss;
1812
1813         store_nc(&nc);
1814         lookup_nc(&nc);
1815         return nc.name ? nc.name : "UNKNOWN";
1816 }
1817
1818 /*******************************************************************
1819  Return the IP addr of the remote end of a socket as a string.
1820  ******************************************************************/
1821
1822 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1823 {
1824         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1825 }
1826
1827 /*******************************************************************
1828  Create protected unix domain socket.
1829
1830  Some unixes cannot set permissions on a ux-dom-sock, so we
1831  have to make sure that the directory contains the protection
1832  permissions instead.
1833  ******************************************************************/
1834
1835 int create_pipe_sock(const char *socket_dir,
1836                      const char *socket_name,
1837                      mode_t dir_perms)
1838 {
1839 #ifdef HAVE_UNIXSOCKET
1840         struct sockaddr_un sunaddr;
1841         struct stat st;
1842         int sock;
1843         mode_t old_umask;
1844         char *path = NULL;
1845
1846         old_umask = umask(0);
1847
1848         /* Create the socket directory or reuse the existing one */
1849
1850         if (lstat(socket_dir, &st) == -1) {
1851                 if (errno == ENOENT) {
1852                         /* Create directory */
1853                         if (mkdir(socket_dir, dir_perms) == -1) {
1854                                 DEBUG(0, ("error creating socket directory "
1855                                         "%s: %s\n", socket_dir,
1856                                         strerror(errno)));
1857                                 goto out_umask;
1858                         }
1859                 } else {
1860                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1861                                 socket_dir, strerror(errno)));
1862                         goto out_umask;
1863                 }
1864         } else {
1865                 /* Check ownership and permission on existing directory */
1866                 if (!S_ISDIR(st.st_mode)) {
1867                         DEBUG(0, ("socket directory %s isn't a directory\n",
1868                                 socket_dir));
1869                         goto out_umask;
1870                 }
1871                 if ((st.st_uid != sec_initial_uid()) ||
1872                                 ((st.st_mode & 0777) != dir_perms)) {
1873                         DEBUG(0, ("invalid permissions on socket directory "
1874                                 "%s\n", socket_dir));
1875                         goto out_umask;
1876                 }
1877         }
1878
1879         /* Create the socket file */
1880
1881         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1882
1883         if (sock == -1) {
1884                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1885                         strerror(errno) ));
1886                 goto out_close;
1887         }
1888
1889         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1890                 goto out_close;
1891         }
1892
1893         unlink(path);
1894         memset(&sunaddr, 0, sizeof(sunaddr));
1895         sunaddr.sun_family = AF_UNIX;
1896         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1897
1898         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1899                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1900                         strerror(errno)));
1901                 goto out_close;
1902         }
1903
1904         if (listen(sock, 5) == -1) {
1905                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1906                         strerror(errno)));
1907                 goto out_close;
1908         }
1909
1910         SAFE_FREE(path);
1911
1912         umask(old_umask);
1913         return sock;
1914
1915 out_close:
1916         SAFE_FREE(path);
1917         if (sock != -1)
1918                 close(sock);
1919
1920 out_umask:
1921         umask(old_umask);
1922         return -1;
1923
1924 #else
1925         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1926         return -1;
1927 #endif /* HAVE_UNIXSOCKET */
1928 }
1929
1930 /****************************************************************************
1931  Get my own canonical name, including domain.
1932 ****************************************************************************/
1933
1934 const char *get_mydnsfullname(void)
1935 {
1936         struct addrinfo *res = NULL;
1937         char my_hostname[HOST_NAME_MAX];
1938         bool ret;
1939         DATA_BLOB tmp;
1940
1941         if (memcache_lookup(NULL, SINGLETON_CACHE,
1942                         data_blob_string_const("get_mydnsfullname"),
1943                         &tmp)) {
1944                 SMB_ASSERT(tmp.length > 0);
1945                 return (const char *)tmp.data;
1946         }
1947
1948         /* get my host name */
1949         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1950                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1951                 return NULL;
1952         }
1953
1954         /* Ensure null termination. */
1955         my_hostname[sizeof(my_hostname)-1] = '\0';
1956
1957         ret = interpret_string_addr_internal(&res,
1958                                 my_hostname,
1959                                 AI_ADDRCONFIG|AI_CANONNAME);
1960
1961         if (!ret || res == NULL) {
1962                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1963                         "name %s [%s]\n",
1964                         my_hostname,
1965                         gai_strerror(ret) ));
1966                 return NULL;
1967         }
1968
1969         /*
1970          * Make sure that getaddrinfo() returns the "correct" host name.
1971          */
1972
1973         if (res->ai_canonname == NULL) {
1974                 DEBUG(3,("get_mydnsfullname: failed to get "
1975                         "canonical name for %s\n",
1976                         my_hostname));
1977                 freeaddrinfo(res);
1978                 return NULL;
1979         }
1980
1981         /* This copies the data, so we must do a lookup
1982          * afterwards to find the value to return.
1983          */
1984
1985         memcache_add(NULL, SINGLETON_CACHE,
1986                         data_blob_string_const("get_mydnsfullname"),
1987                         data_blob_string_const(res->ai_canonname));
1988
1989         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1990                         data_blob_string_const("get_mydnsfullname"),
1991                         &tmp)) {
1992                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1993                                 strlen(res->ai_canonname) + 1);
1994         }
1995
1996         freeaddrinfo(res);
1997
1998         return (const char *)tmp.data;
1999 }
2000
2001 /************************************************************
2002  Is this my name ?
2003 ************************************************************/
2004
2005 bool is_myname_or_ipaddr(const char *s)
2006 {
2007         TALLOC_CTX *ctx = talloc_tos();
2008         char *name = NULL;
2009         const char *dnsname;
2010         char *servername = NULL;
2011
2012         if (!s) {
2013                 return false;
2014         }
2015
2016         /* Santize the string from '\\name' */
2017         name = talloc_strdup(ctx, s);
2018         if (!name) {
2019                 return false;
2020         }
2021
2022         servername = strrchr_m(name, '\\' );
2023         if (!servername) {
2024                 servername = name;
2025         } else {
2026                 servername++;
2027         }
2028
2029         /* Optimize for the common case */
2030         if (strequal(servername, global_myname())) {
2031                 return true;
2032         }
2033
2034         /* Check for an alias */
2035         if (is_myname(servername)) {
2036                 return true;
2037         }
2038
2039         /* Check for loopback */
2040         if (strequal(servername, "127.0.0.1") ||
2041                         strequal(servername, "::1")) {
2042                 return true;
2043         }
2044
2045         if (strequal(servername, "localhost")) {
2046                 return true;
2047         }
2048
2049         /* Maybe it's my dns name */
2050         dnsname = get_mydnsfullname();
2051         if (dnsname && strequal(servername, dnsname)) {
2052                 return true;
2053         }
2054
2055         /* Handle possible CNAME records - convert to an IP addr. */
2056         if (!is_ipaddress(servername)) {
2057                 /* Use DNS to resolve the name, but only the first address */
2058                 struct sockaddr_storage ss;
2059                 if (interpret_string_addr(&ss, servername,0)) {
2060                         print_sockaddr(name,
2061                                         sizeof(name),
2062                                         &ss);
2063                         servername = name;
2064                 }
2065         }
2066
2067         /* Maybe its an IP address? */
2068         if (is_ipaddress(servername)) {
2069                 struct sockaddr_storage ss;
2070                 struct iface_struct *nics;
2071                 int i, n;
2072
2073                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
2074                         return false;
2075                 }
2076
2077                 if (is_zero_addr(&ss) || is_loopback_addr(&ss)) {
2078                         return false;
2079                 }
2080
2081                 nics = TALLOC_ARRAY(ctx, struct iface_struct,
2082                                         MAX_INTERFACES);
2083                 if (!nics) {
2084                         return false;
2085                 }
2086                 n = get_interfaces(nics, MAX_INTERFACES);
2087                 for (i=0; i<n; i++) {
2088                         if (addr_equal(&nics[i].ip, &ss)) {
2089                                 TALLOC_FREE(nics);
2090                                 return true;
2091                         }
2092                 }
2093                 TALLOC_FREE(nics);
2094         }
2095
2096         /* No match */
2097         return false;
2098 }