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 #include "memcache.h"
  24 #include "../lib/async_req/async_sock.h"
  25 #include "../lib/util/select.h"
  26
  27 /****************************************************************************
  28  Get a port number in host byte order from a sockaddr_storage.
  29 ****************************************************************************/
  30
  31 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
  32 {
  33         uint16_t port = 0;
  34
  35         if (pss->ss_family != AF_INET) {
  36 #if defined(HAVE_IPV6)
  37                 /* IPv6 */
  38                 const struct sockaddr_in6 *sa6 =
  39                         (const struct sockaddr_in6 *)pss;
  40                 port = ntohs(sa6->sin6_port);
  41 #endif
  42         } else {
  43                 const struct sockaddr_in *sa =
  44                         (const struct sockaddr_in *)pss;
  45                 port = ntohs(sa->sin_port);
  46         }
  47         return port;
  48 }
  49
  50 /****************************************************************************
  51  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
  52 ****************************************************************************/
  53
  54 static char *print_sockaddr_len(char *dest,
  55                         size_t destlen,
  56                         const struct sockaddr *psa,
  57                         socklen_t psalen)
  58 {
  59         if (destlen > 0) {
  60                 dest[0] = '\0';
  61         }
  62         (void)sys_getnameinfo(psa,
  63                         psalen,
  64                         dest, destlen,
  65                         NULL, 0,
  66                         NI_NUMERICHOST);
  67         return dest;
  68 }
  69
  70 /****************************************************************************
  71  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
  72 ****************************************************************************/
  73
  74 char *print_sockaddr(char *dest,
  75                         size_t destlen,
  76                         const struct sockaddr_storage *psa)
  77 {
  78         return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
  79                         sizeof(struct sockaddr_storage));
  80 }
  81
  82 /****************************************************************************
  83  Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
  84 ****************************************************************************/
  85
  86 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
  87                         const struct sockaddr_storage *pss)
  88 {
  89         char addr[INET6_ADDRSTRLEN];
  90         char *dest = NULL;
  91         int ret;
  92
  93         /* Linux getnameinfo() man pages says port is unitialized if
  94            service name is NULL. */
  95
  96         ret = sys_getnameinfo((const struct sockaddr *)pss,
  97                         sizeof(struct sockaddr_storage),
  98                         addr, sizeof(addr),
  99                         NULL, 0,
 100                         NI_NUMERICHOST);
 101         if (ret != 0) {
 102                 return NULL;
 103         }
 104
 105         if (pss->ss_family != AF_INET) {
 106 #if defined(HAVE_IPV6)
 107                 dest = talloc_asprintf(ctx, "[%s]", addr);
 108 #else
 109                 return NULL;
 110 #endif
 111         } else {
 112                 dest = talloc_asprintf(ctx, "%s", addr);
 113         }
 114
 115         return dest;
 116 }
 117
 118 /****************************************************************************
 119  Return the string of an IP address (IPv4 or IPv6).
 120 ****************************************************************************/
 121
 122 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
 123 {
 124         struct sockaddr_storage sa;
 125         socklen_t length = sizeof(sa);
 126
 127         /* Ok, returning a hard coded IPv4 address
 128          * is bogus, but it's just as bogus as a
 129          * zero IPv6 address. No good choice here.
 130          */
 131
 132         strlcpy(addr_buf, "0.0.0.0", addr_len);
 133
 134         if (fd == -1) {
 135                 return addr_buf;
 136         }
 137
 138         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 139                 DEBUG(0,("getsockname failed. Error was %s\n",
 140                         strerror(errno) ));
 141                 return addr_buf;
 142         }
 143
 144         return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
 145 }
 146
 147 /****************************************************************************
 148  Return the port number we've bound to on a socket.
 149 ****************************************************************************/
 150
 151 int get_socket_port(int fd)
 152 {
 153         struct sockaddr_storage sa;
 154         socklen_t length = sizeof(sa);
 155
 156         if (fd == -1) {
 157                 return -1;
 158         }
 159
 160         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 161                 int level = (errno == ENOTCONN) ? 2 : 0;
 162                 DEBUG(level, ("getpeername failed. Error was %s\n",
 163                                strerror(errno)));
 164                 return -1;
 165         }
 166
 167 #if defined(HAVE_IPV6)
 168         if (sa.ss_family == AF_INET6) {
 169                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
 170         }
 171 #endif
 172         if (sa.ss_family == AF_INET) {
 173                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
 174         }
 175         return -1;
 176 }
 177
 178 const char *client_name(int fd)
 179 {
 180         return get_peer_name(fd,false);
 181 }
 182
 183 const char *client_addr(int fd, char *addr, size_t addrlen)
 184 {
 185         return get_peer_addr(fd,addr,addrlen);
 186 }
 187
 188 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
 189 {
 190         return get_socket_addr(fd, addr, addr_len);
 191 }
 192
 193 #if 0
 194 /* Not currently used. JRA. */
 195 int client_socket_port(int fd)
 196 {
 197         return get_socket_port(fd);
 198 }
 199 #endif
 200
 201 /****************************************************************************
 202  Accessor functions to make thread-safe code easier later...
 203 ****************************************************************************/
 204
 205 void set_smb_read_error(enum smb_read_errors *pre,
 206                         enum smb_read_errors newerr)
 207 {
 208         if (pre) {
 209                 *pre = newerr;
 210         }
 211 }
 212
 213 void cond_set_smb_read_error(enum smb_read_errors *pre,
 214                         enum smb_read_errors newerr)
 215 {
 216         if (pre && *pre == SMB_READ_OK) {
 217                 *pre = newerr;
 218         }
 219 }
 220
 221 /****************************************************************************
 222  Determine if a file descriptor is in fact a socket.
 223 ****************************************************************************/
 224
 225 bool is_a_socket(int fd)
 226 {
 227         int v;
 228         socklen_t l;
 229         l = sizeof(int);
 230         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
 231 }
 232
 233 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
 234
 235 typedef struct smb_socket_option {
 236         const char *name;
 237         int level;
 238         int option;
 239         int value;
 240         int opttype;
 241 } smb_socket_option;
 242
 243 static const smb_socket_option socket_options[] = {
 244   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
 245   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
 246   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
 247 #ifdef TCP_NODELAY
 248   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
 249 #endif
 250 #ifdef TCP_KEEPCNT
 251   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
 252 #endif
 253 #ifdef TCP_KEEPIDLE
 254   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
 255 #endif
 256 #ifdef TCP_KEEPINTVL
 257   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
 258 #endif
 259 #ifdef IPTOS_LOWDELAY
 260   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
 261 #endif
 262 #ifdef IPTOS_THROUGHPUT
 263   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
 264 #endif
 265 #ifdef SO_REUSEPORT
 266   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
 267 #endif
 268 #ifdef SO_SNDBUF
 269   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
 270 #endif
 271 #ifdef SO_RCVBUF
 272   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
 273 #endif
 274 #ifdef SO_SNDLOWAT
 275   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
 276 #endif
 277 #ifdef SO_RCVLOWAT
 278   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
 279 #endif
 280 #ifdef SO_SNDTIMEO
 281   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
 282 #endif
 283 #ifdef SO_RCVTIMEO
 284   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
 285 #endif
 286 #ifdef TCP_FASTACK
 287   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
 288 #endif
 289 #ifdef TCP_QUICKACK
 290   {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL},
 291 #endif
 292 #ifdef TCP_KEEPALIVE_THRESHOLD
 293   {"TCP_KEEPALIVE_THRESHOLD", IPPROTO_TCP, TCP_KEEPALIVE_THRESHOLD, 0, OPT_INT},
 294 #endif
 295 #ifdef TCP_KEEPALIVE_ABORT_THRESHOLD
 296   {"TCP_KEEPALIVE_ABORT_THRESHOLD", IPPROTO_TCP, TCP_KEEPALIVE_ABORT_THRESHOLD, 0, OPT_INT},
 297 #endif
 298   {NULL,0,0,0,0}};
 299
 300 /****************************************************************************
 301  Print socket options.
 302 ****************************************************************************/
 303
 304 static void print_socket_options(int s)
 305 {
 306         int value;
 307         socklen_t vlen = 4;
 308         const smb_socket_option *p = &socket_options[0];
 309
 310         /* wrapped in if statement to prevent streams
 311          * leak in SCO Openserver 5.0 */
 312         /* reported on samba-technical  --jerry */
 313         if ( DEBUGLEVEL >= 5 ) {
 314                 DEBUG(5,("Socket options:\n"));
 315                 for (; p->name != NULL; p++) {
 316                         if (getsockopt(s, p->level, p->option,
 317                                                 (void *)&value, &vlen) == -1) {
 318                                 DEBUGADD(5,("\tCould not test socket option %s.\n",
 319                                                         p->name));
 320                         } else {
 321                                 DEBUGADD(5,("\t%s = %d\n",
 322                                                         p->name,value));
 323                         }
 324                 }
 325         }
 326  }
 327
 328 /****************************************************************************
 329  Set user socket options.
 330 ****************************************************************************/
 331
 332 void set_socket_options(int fd, const char *options)
 333 {
 334         TALLOC_CTX *ctx = talloc_stackframe();
 335         char *tok;
 336
 337         while (next_token_talloc(ctx, &options, &tok," \t,")) {
 338                 int ret=0,i;
 339                 int value = 1;
 340                 char *p;
 341                 bool got_value = false;
 342
 343                 if ((p = strchr_m(tok,'='))) {
 344                         *p = 0;
 345                         value = atoi(p+1);
 346                         got_value = true;
 347                 }
 348
 349                 for (i=0;socket_options[i].name;i++)
 350                         if (strequal(socket_options[i].name,tok))
 351                                 break;
 352
 353                 if (!socket_options[i].name) {
 354                         DEBUG(0,("Unknown socket option %s\n",tok));
 355                         continue;
 356                 }
 357
 358                 switch (socket_options[i].opttype) {
 359                 case OPT_BOOL:
 360                 case OPT_INT:
 361                         ret = setsockopt(fd,socket_options[i].level,
 362                                         socket_options[i].option,
 363                                         (char *)&value,sizeof(int));
 364                         break;
 365
 366                 case OPT_ON:
 367                         if (got_value)
 368                                 DEBUG(0,("syntax error - %s "
 369                                         "does not take a value\n",tok));
 370
 371                         {
 372                                 int on = socket_options[i].value;
 373                                 ret = setsockopt(fd,socket_options[i].level,
 374                                         socket_options[i].option,
 375                                         (char *)&on,sizeof(int));
 376                         }
 377                         break;
 378                 }
 379
 380                 if (ret != 0) {
 381                         /* be aware that some systems like Solaris return
 382                          * EINVAL to a setsockopt() call when the client
 383                          * sent a RST previously - no need to worry */
 384                         DEBUG(2,("Failed to set socket option %s (Error %s)\n",
 385                                 tok, strerror(errno) ));
 386                 }
 387         }
 388
 389         TALLOC_FREE(ctx);
 390         print_socket_options(fd);
 391 }
 392
 393 /****************************************************************************
 394  Read from a socket.
 395 ****************************************************************************/
 396
 397 ssize_t read_udp_v4_socket(int fd,
 398                         char *buf,
 399                         size_t len,
 400                         struct sockaddr_storage *psa)
 401 {
 402         ssize_t ret;
 403         socklen_t socklen = sizeof(*psa);
 404         struct sockaddr_in *si = (struct sockaddr_in *)psa;
 405
 406         memset((char *)psa,'\0',socklen);
 407
 408         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
 409                         (struct sockaddr *)psa,&socklen);
 410         if (ret <= 0) {
 411                 /* Don't print a low debug error for a non-blocking socket. */
 412                 if (errno == EAGAIN) {
 413                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 414                 } else {
 415                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 416                                 strerror(errno)));
 417                 }
 418                 return 0;
 419         }
 420
 421         if (psa->ss_family != AF_INET) {
 422                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 423                         "(not IPv4)\n", (int)psa->ss_family));
 424                 return 0;
 425         }
 426
 427         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 428                         inet_ntoa(si->sin_addr),
 429                         si->sin_port,
 430                         (unsigned long)ret));
 431
 432         return ret;
 433 }
 434
 435 /****************************************************************************
 436  Read data from a file descriptor with a timout in msec.
 437  mincount = if timeout, minimum to read before returning
 438  maxcount = number to be read.
 439  time_out = timeout in milliseconds
 440  NB. This can be called with a non-socket fd, don't change
 441  sys_read() to sys_recv() or other socket call.
 442 ****************************************************************************/
 443
 444 NTSTATUS read_fd_with_timeout(int fd, char *buf,
 445                                   size_t mincnt, size_t maxcnt,
 446                                   unsigned int time_out,
 447                                   size_t *size_ret)
 448 {
 449         fd_set fds;
 450         int selrtn;
 451         ssize_t readret;
 452         size_t nread = 0;
 453         struct timeval timeout;
 454
 455         /* just checking .... */
 456         if (maxcnt <= 0)
 457                 return NT_STATUS_OK;
 458
 459         /* Blocking read */
 460         if (time_out == 0) {
 461                 if (mincnt == 0) {
 462                         mincnt = maxcnt;
 463                 }
 464
 465                 while (nread < mincnt) {
 466                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 467
 468                         if (readret == 0) {
 469                                 DEBUG(5,("read_fd_with_timeout: "
 470                                         "blocking read. EOF from client.\n"));
 471                                 return NT_STATUS_END_OF_FILE;
 472                         }
 473
 474                         if (readret == -1) {
 475                                 return map_nt_error_from_unix(errno);
 476                         }
 477                         nread += readret;
 478                 }
 479                 goto done;
 480         }
 481
 482         /* Most difficult - timeout read */
 483         /* If this is ever called on a disk file and
 484            mincnt is greater then the filesize then
 485            system performance will suffer severely as
 486            select always returns true on disk files */
 487
 488         /* Set initial timeout */
 489         timeout.tv_sec = (time_t)(time_out / 1000);
 490         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 491
 492         for (nread=0; nread < mincnt; ) {
 493                 FD_ZERO(&fds);
 494                 FD_SET(fd,&fds);
 495
 496                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 497
 498                 /* Check if error */
 499                 if (selrtn == -1) {
 500                         return map_nt_error_from_unix(errno);
 501                 }
 502
 503                 /* Did we timeout ? */
 504                 if (selrtn == 0) {
 505                         DEBUG(10,("read_fd_with_timeout: timeout read. "
 506                                 "select timed out.\n"));
 507                         return NT_STATUS_IO_TIMEOUT;
 508                 }
 509
 510                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 511
 512                 if (readret == 0) {
 513                         /* we got EOF on the file descriptor */
 514                         DEBUG(5,("read_fd_with_timeout: timeout read. "
 515                                 "EOF from client.\n"));
 516                         return NT_STATUS_END_OF_FILE;
 517                 }
 518
 519                 if (readret == -1) {
 520                         return map_nt_error_from_unix(errno);
 521                 }
 522
 523                 nread += readret;
 524         }
 525
 526  done:
 527         /* Return the number we got */
 528         if (size_ret) {
 529                 *size_ret = nread;
 530         }
 531         return NT_STATUS_OK;
 532 }
 533
 534 /****************************************************************************
 535  Read data from an fd, reading exactly N bytes.
 536  NB. This can be called with a non-socket fd, don't add dependencies
 537  on socket calls.
 538 ****************************************************************************/
 539
 540 NTSTATUS read_data(int fd, char *buffer, size_t N)
 541 {
 542         return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
 543 }
 544
 545 /****************************************************************************
 546  Write all data from an iov array
 547  NB. This can be called with a non-socket fd, don't add dependencies
 548  on socket calls.
 549 ****************************************************************************/
 550
 551 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 552 {
 553         int i;
 554         size_t to_send;
 555         ssize_t thistime;
 556         size_t sent;
 557         struct iovec *iov_copy, *iov;
 558
 559         to_send = 0;
 560         for (i=0; i<iovcnt; i++) {
 561                 to_send += orig_iov[i].iov_len;
 562         }
 563
 564         thistime = sys_writev(fd, orig_iov, iovcnt);
 565         if ((thistime <= 0) || (thistime == to_send)) {
 566                 return thistime;
 567         }
 568         sent = thistime;
 569
 570         /*
 571          * We could not send everything in one call. Make a copy of iov that
 572          * we can mess with. We keep a copy of the array start in iov_copy for
 573          * the TALLOC_FREE, because we're going to modify iov later on,
 574          * discarding elements.
 575          */
 576
 577         iov_copy = (struct iovec *)TALLOC_MEMDUP(
 578                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 579
 580         if (iov_copy == NULL) {
 581                 errno = ENOMEM;
 582                 return -1;
 583         }
 584         iov = iov_copy;
 585
 586         while (sent < to_send) {
 587                 /*
 588                  * We have to discard "thistime" bytes from the beginning
 589                  * iov array, "thistime" contains the number of bytes sent
 590                  * via writev last.
 591                  */
 592                 while (thistime > 0) {
 593                         if (thistime < iov[0].iov_len) {
 594                                 char *new_base =
 595                                         (char *)iov[0].iov_base + thistime;
 596                                 iov[0].iov_base = (void *)new_base;
 597                                 iov[0].iov_len -= thistime;
 598                                 break;
 599                         }
 600                         thistime -= iov[0].iov_len;
 601                         iov += 1;
 602                         iovcnt -= 1;
 603                 }
 604
 605                 thistime = sys_writev(fd, iov, iovcnt);
 606                 if (thistime <= 0) {
 607                         break;
 608                 }
 609                 sent += thistime;
 610         }
 611
 612         TALLOC_FREE(iov_copy);
 613         return sent;
 614 }
 615
 616 /****************************************************************************
 617  Write data to a fd.
 618  NB. This can be called with a non-socket fd, don't add dependencies
 619  on socket calls.
 620 ****************************************************************************/
 621
 622 ssize_t write_data(int fd, const char *buffer, size_t N)
 623 {
 624         struct iovec iov;
 625
 626         iov.iov_base = CONST_DISCARD(void *, buffer);
 627         iov.iov_len = N;
 628         return write_data_iov(fd, &iov, 1);
 629 }
 630
 631 /****************************************************************************
 632  Send a keepalive packet (rfc1002).
 633 ****************************************************************************/
 634
 635 bool send_keepalive(int client)
 636 {
 637         unsigned char buf[4];
 638
 639         buf[0] = SMBkeepalive;
 640         buf[1] = buf[2] = buf[3] = 0;
 641
 642         return(write_data(client,(char *)buf,4) == 4);
 643 }
 644
 645 /****************************************************************************
 646  Read 4 bytes of a smb packet and return the smb length of the packet.
 647  Store the result in the buffer.
 648  This version of the function will return a length of zero on receiving
 649  a keepalive packet.
 650  Timeout is in milliseconds.
 651 ****************************************************************************/
 652
 653 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 654                                           unsigned int timeout,
 655                                           size_t *len)
 656 {
 657         int msg_type;
 658         NTSTATUS status;
 659
 660         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 661
 662         if (!NT_STATUS_IS_OK(status)) {
 663                 return status;
 664         }
 665
 666         *len = smb_len(inbuf);
 667         msg_type = CVAL(inbuf,0);
 668
 669         if (msg_type == SMBkeepalive) {
 670                 DEBUG(5,("Got keepalive packet\n"));
 671         }
 672
 673         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 674
 675         return NT_STATUS_OK;
 676 }
 677
 678 /****************************************************************************
 679  Read an smb from a fd.
 680  The timeout is in milliseconds.
 681  This function will return on receipt of a session keepalive packet.
 682  maxlen is the max number of bytes to return, not including the 4 byte
 683  length. If zero it means buflen limit.
 684  Doesn't check the MAC on signed packets.
 685 ****************************************************************************/
 686
 687 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 688                          size_t maxlen, size_t *p_len)
 689 {
 690         size_t len;
 691         NTSTATUS status;
 692
 693         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 694
 695         if (!NT_STATUS_IS_OK(status)) {
 696                 DEBUG(0, ("read_fd_with_timeout failed, read "
 697                           "error = %s.\n", nt_errstr(status)));
 698                 return status;
 699         }
 700
 701         if (len > buflen) {
 702                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 703                                         (unsigned long)len));
 704                 return NT_STATUS_INVALID_PARAMETER;
 705         }
 706
 707         if(len > 0) {
 708                 if (maxlen) {
 709                         len = MIN(len,maxlen);
 710                 }
 711
 712                 status = read_fd_with_timeout(
 713                         fd, buffer+4, len, len, timeout, &len);
 714
 715                 if (!NT_STATUS_IS_OK(status)) {
 716                         DEBUG(0, ("read_fd_with_timeout failed, read error = "
 717                                   "%s.\n", nt_errstr(status)));
 718                         return status;
 719                 }
 720
 721                 /* not all of samba3 properly checks for packet-termination
 722                  * of strings. This ensures that we don't run off into
 723                  * empty space. */
 724                 SSVAL(buffer+4,len, 0);
 725         }
 726
 727         *p_len = len;
 728         return NT_STATUS_OK;
 729 }
 730
 731 /****************************************************************************
 732  Open a socket of the specified type, port, and address for incoming data.
 733 ****************************************************************************/
 734
 735 int open_socket_in(int type,
 736                 uint16_t port,
 737                 int dlevel,
 738                 const struct sockaddr_storage *psock,
 739                 bool rebind)
 740 {
 741         struct sockaddr_storage sock;
 742         int res;
 743         socklen_t slen = sizeof(struct sockaddr_in);
 744
 745         sock = *psock;
 746
 747 #if defined(HAVE_IPV6)
 748         if (sock.ss_family == AF_INET6) {
 749                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 750                 slen = sizeof(struct sockaddr_in6);
 751         }
 752 #endif
 753         if (sock.ss_family == AF_INET) {
 754                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 755         }
 756
 757         res = socket(sock.ss_family, type, 0 );
 758         if( res == -1 ) {
 759                 if( DEBUGLVL(0) ) {
 760                         dbgtext( "open_socket_in(): socket() call failed: " );
 761                         dbgtext( "%s\n", strerror( errno ) );
 762                 }
 763                 return -1;
 764         }
 765
 766         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 767         {
 768                 int val = rebind ? 1 : 0;
 769                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 770                                         (char *)&val,sizeof(val)) == -1 ) {
 771                         if( DEBUGLVL( dlevel ) ) {
 772                                 dbgtext( "open_socket_in(): setsockopt: " );
 773                                 dbgtext( "SO_REUSEADDR = %s ",
 774                                                 val?"true":"false" );
 775                                 dbgtext( "on port %d failed ", port );
 776                                 dbgtext( "with error = %s\n", strerror(errno) );
 777                         }
 778                 }
 779 #ifdef SO_REUSEPORT
 780                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 781                                         (char *)&val,sizeof(val)) == -1 ) {
 782                         if( DEBUGLVL( dlevel ) ) {
 783                                 dbgtext( "open_socket_in(): setsockopt: ");
 784                                 dbgtext( "SO_REUSEPORT = %s ",
 785                                                 val?"true":"false");
 786                                 dbgtext( "on port %d failed ", port);
 787                                 dbgtext( "with error = %s\n", strerror(errno));
 788                         }
 789                 }
 790 #endif /* SO_REUSEPORT */
 791         }
 792
 793         /* now we've got a socket - we need to bind it */
 794         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 795                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 796                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 797                         char addr[INET6_ADDRSTRLEN];
 798                         print_sockaddr(addr, sizeof(addr),
 799                                         &sock);
 800                         dbgtext( "bind failed on port %d ", port);
 801                         dbgtext( "socket_addr = %s.\n", addr);
 802                         dbgtext( "Error = %s\n", strerror(errno));
 803                 }
 804                 close(res);
 805                 return -1;
 806         }
 807
 808         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 809         return( res );
 810  }
 811
 812 struct open_socket_out_state {
 813         int fd;
 814         struct event_context *ev;
 815         struct sockaddr_storage ss;
 816         socklen_t salen;
 817         uint16_t port;
 818         int wait_nsec;
 819 };
 820
 821 static void open_socket_out_connected(struct tevent_req *subreq);
 822
 823 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 824 {
 825         if (s->fd != -1) {
 826                 close(s->fd);
 827         }
 828         return 0;
 829 }
 830
 831 /****************************************************************************
 832  Create an outgoing socket. timeout is in milliseconds.
 833 **************************************************************************/
 834
 835 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 836                                         struct event_context *ev,
 837                                         const struct sockaddr_storage *pss,
 838                                         uint16_t port,
 839                                         int timeout)
 840 {
 841         char addr[INET6_ADDRSTRLEN];
 842         struct tevent_req *result, *subreq;
 843         struct open_socket_out_state *state;
 844         NTSTATUS status;
 845
 846         result = tevent_req_create(mem_ctx, &state,
 847                                    struct open_socket_out_state);
 848         if (result == NULL) {
 849                 return NULL;
 850         }
 851         state->ev = ev;
 852         state->ss = *pss;
 853         state->port = port;
 854         state->wait_nsec = 10000;
 855         state->salen = -1;
 856
 857         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 858         if (state->fd == -1) {
 859                 status = map_nt_error_from_unix(errno);
 860                 goto post_status;
 861         }
 862         talloc_set_destructor(state, open_socket_out_state_destructor);
 863
 864         if (!tevent_req_set_endtime(
 865                     result, ev, timeval_current_ofs(0, timeout*1000))) {
 866                 goto fail;
 867         }
 868
 869 #if defined(HAVE_IPV6)
 870         if (pss->ss_family == AF_INET6) {
 871                 struct sockaddr_in6 *psa6;
 872                 psa6 = (struct sockaddr_in6 *)&state->ss;
 873                 psa6->sin6_port = htons(port);
 874                 if (psa6->sin6_scope_id == 0
 875                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 876                         setup_linklocal_scope_id(
 877                                 (struct sockaddr *)&(state->ss));
 878                 }
 879                 state->salen = sizeof(struct sockaddr_in6);
 880         }
 881 #endif
 882         if (pss->ss_family == AF_INET) {
 883                 struct sockaddr_in *psa;
 884                 psa = (struct sockaddr_in *)&state->ss;
 885                 psa->sin_port = htons(port);
 886                 state->salen = sizeof(struct sockaddr_in);
 887         }
 888
 889         if (pss->ss_family == AF_UNIX) {
 890                 state->salen = sizeof(struct sockaddr_un);
 891         }
 892
 893         print_sockaddr(addr, sizeof(addr), &state->ss);
 894         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 895
 896         subreq = async_connect_send(state, state->ev, state->fd,
 897                                     (struct sockaddr *)&state->ss,
 898                                     state->salen);
 899         if ((subreq == NULL)
 900             || !tevent_req_set_endtime(
 901                     subreq, state->ev,
 902                     timeval_current_ofs(0, state->wait_nsec))) {
 903                 goto fail;
 904         }
 905         tevent_req_set_callback(subreq, open_socket_out_connected, result);
 906         return result;
 907
 908  post_status:
 909         tevent_req_nterror(result, status);
 910         return tevent_req_post(result, ev);
 911  fail:
 912         TALLOC_FREE(result);
 913         return NULL;
 914 }
 915
 916 static void open_socket_out_connected(struct tevent_req *subreq)
 917 {
 918         struct tevent_req *req =
 919                 tevent_req_callback_data(subreq, struct tevent_req);
 920         struct open_socket_out_state *state =
 921                 tevent_req_data(req, struct open_socket_out_state);
 922         int ret;
 923         int sys_errno;
 924
 925         ret = async_connect_recv(subreq, &sys_errno);
 926         TALLOC_FREE(subreq);
 927         if (ret == 0) {
 928                 tevent_req_done(req);
 929                 return;
 930         }
 931
 932         if (
 933 #ifdef ETIMEDOUT
 934                 (sys_errno == ETIMEDOUT) ||
 935 #endif
 936                 (sys_errno == EINPROGRESS) ||
 937                 (sys_errno == EALREADY) ||
 938                 (sys_errno == EAGAIN)) {
 939
 940                 /*
 941                  * retry
 942                  */
 943
 944                 if (state->wait_nsec < 250000) {
 945                         state->wait_nsec *= 1.5;
 946                 }
 947
 948                 subreq = async_connect_send(state, state->ev, state->fd,
 949                                             (struct sockaddr *)&state->ss,
 950                                             state->salen);
 951                 if (tevent_req_nomem(subreq, req)) {
 952                         return;
 953                 }
 954                 if (!tevent_req_set_endtime(
 955                             subreq, state->ev,
 956                             timeval_current_ofs(0, state->wait_nsec))) {
 957                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 958                         return;
 959                 }
 960                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
 961                 return;
 962         }
 963
 964 #ifdef EISCONN
 965         if (sys_errno == EISCONN) {
 966                 tevent_req_done(req);
 967                 return;
 968         }
 969 #endif
 970
 971         /* real error */
 972         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
 973 }
 974
 975 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
 976 {
 977         struct open_socket_out_state *state =
 978                 tevent_req_data(req, struct open_socket_out_state);
 979         NTSTATUS status;
 980
 981         if (tevent_req_is_nterror(req, &status)) {
 982                 return status;
 983         }
 984         *pfd = state->fd;
 985         state->fd = -1;
 986         return NT_STATUS_OK;
 987 }
 988
 989 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
 990                          int timeout, int *pfd)
 991 {
 992         TALLOC_CTX *frame = talloc_stackframe();
 993         struct event_context *ev;
 994         struct tevent_req *req;
 995         NTSTATUS status = NT_STATUS_NO_MEMORY;
 996
 997         ev = event_context_init(frame);
 998         if (ev == NULL) {
 999                 goto fail;
1000         }
1001
1002         req = open_socket_out_send(frame, ev, pss, port, timeout);
1003         if (req == NULL) {
1004                 goto fail;
1005         }
1006         if (!tevent_req_poll(req, ev)) {
1007                 status = NT_STATUS_INTERNAL_ERROR;
1008                 goto fail;
1009         }
1010         status = open_socket_out_recv(req, pfd);
1011  fail:
1012         TALLOC_FREE(frame);
1013         return status;
1014 }
1015
1016 struct open_socket_out_defer_state {
1017         struct event_context *ev;
1018         struct sockaddr_storage ss;
1019         uint16_t port;
1020         int timeout;
1021         int fd;
1022 };
1023
1024 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1025 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1026
1027 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1028                                               struct event_context *ev,
1029                                               struct timeval wait_time,
1030                                               const struct sockaddr_storage *pss,
1031                                               uint16_t port,
1032                                               int timeout)
1033 {
1034         struct tevent_req *req, *subreq;
1035         struct open_socket_out_defer_state *state;
1036
1037         req = tevent_req_create(mem_ctx, &state,
1038                                 struct open_socket_out_defer_state);
1039         if (req == NULL) {
1040                 return NULL;
1041         }
1042         state->ev = ev;
1043         state->ss = *pss;
1044         state->port = port;
1045         state->timeout = timeout;
1046
1047         subreq = tevent_wakeup_send(
1048                 state, ev,
1049                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1050         if (subreq == NULL) {
1051                 goto fail;
1052         }
1053         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1054         return req;
1055  fail:
1056         TALLOC_FREE(req);
1057         return NULL;
1058 }
1059
1060 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1061 {
1062         struct tevent_req *req = tevent_req_callback_data(
1063                 subreq, struct tevent_req);
1064         struct open_socket_out_defer_state *state = tevent_req_data(
1065                 req, struct open_socket_out_defer_state);
1066         bool ret;
1067
1068         ret = tevent_wakeup_recv(subreq);
1069         TALLOC_FREE(subreq);
1070         if (!ret) {
1071                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1072                 return;
1073         }
1074
1075         subreq = open_socket_out_send(state, state->ev, &state->ss,
1076                                       state->port, state->timeout);
1077         if (tevent_req_nomem(subreq, req)) {
1078                 return;
1079         }
1080         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1081 }
1082
1083 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1084 {
1085         struct tevent_req *req = tevent_req_callback_data(
1086                 subreq, struct tevent_req);
1087         struct open_socket_out_defer_state *state = tevent_req_data(
1088                 req, struct open_socket_out_defer_state);
1089         NTSTATUS status;
1090
1091         status = open_socket_out_recv(subreq, &state->fd);
1092         TALLOC_FREE(subreq);
1093         if (!NT_STATUS_IS_OK(status)) {
1094                 tevent_req_nterror(req, status);
1095                 return;
1096         }
1097         tevent_req_done(req);
1098 }
1099
1100 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1101 {
1102         struct open_socket_out_defer_state *state = tevent_req_data(
1103                 req, struct open_socket_out_defer_state);
1104         NTSTATUS status;
1105
1106         if (tevent_req_is_nterror(req, &status)) {
1107                 return status;
1108         }
1109         *pfd = state->fd;
1110         state->fd = -1;
1111         return NT_STATUS_OK;
1112 }
1113
1114 /*******************************************************************
1115  Create an outgoing TCP socket to the first addr that connects.
1116
1117  This is for simultaneous connection attempts to port 445 and 139 of a host
1118  or for simultatneous connection attempts to multiple DCs at once.  We return
1119  a socket fd of the first successful connection.
1120
1121  @param[in] addrs list of Internet addresses and ports to connect to
1122  @param[in] num_addrs number of address/port pairs in the addrs list
1123  @param[in] timeout time after which we stop waiting for a socket connection
1124             to succeed, given in milliseconds
1125  @param[out] fd_index the entry in addrs which we successfully connected to
1126  @param[out] fd fd of the open and connected socket
1127  @return true on a successful connection, false if all connection attempts
1128          failed or we timed out
1129 *******************************************************************/
1130
1131 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1132                          int timeout, int *fd_index, int *fd)
1133 {
1134         int i, resulting_index, res;
1135         int *sockets;
1136         bool good_connect;
1137
1138         fd_set r_fds, wr_fds;
1139         struct timeval tv;
1140         int maxfd;
1141
1142         int connect_loop = 10000; /* 10 milliseconds */
1143
1144         timeout *= 1000;        /* convert to microseconds */
1145
1146         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1147
1148         if (sockets == NULL)
1149                 return false;
1150
1151         resulting_index = -1;
1152
1153         for (i=0; i<num_addrs; i++)
1154                 sockets[i] = -1;
1155
1156         for (i=0; i<num_addrs; i++) {
1157                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1158                 if (sockets[i] < 0)
1159                         goto done;
1160                 set_blocking(sockets[i], false);
1161         }
1162
1163  connect_again:
1164         good_connect = false;
1165
1166         for (i=0; i<num_addrs; i++) {
1167                 const struct sockaddr * a =
1168                     (const struct sockaddr *)&(addrs[i]);
1169
1170                 if (sockets[i] == -1)
1171                         continue;
1172
1173                 if (sys_connect(sockets[i], a) == 0) {
1174                         /* Rather unlikely as we are non-blocking, but it
1175                          * might actually happen. */
1176                         resulting_index = i;
1177                         goto done;
1178                 }
1179
1180                 if (errno == EINPROGRESS || errno == EALREADY ||
1181 #ifdef EISCONN
1182                         errno == EISCONN ||
1183 #endif
1184                     errno == EAGAIN || errno == EINTR) {
1185                         /* These are the error messages that something is
1186                            progressing. */
1187                         good_connect = true;
1188                 } else if (errno != 0) {
1189                         /* There was a direct error */
1190                         close(sockets[i]);
1191                         sockets[i] = -1;
1192                 }
1193         }
1194
1195         if (!good_connect) {
1196                 /* All of the connect's resulted in real error conditions */
1197                 goto done;
1198         }
1199
1200         /* Lets see if any of the connect attempts succeeded */
1201
1202         maxfd = 0;
1203         FD_ZERO(&wr_fds);
1204         FD_ZERO(&r_fds);
1205
1206         for (i=0; i<num_addrs; i++) {
1207                 if (sockets[i] == -1)
1208                         continue;
1209                 FD_SET(sockets[i], &wr_fds);
1210                 FD_SET(sockets[i], &r_fds);
1211                 if (sockets[i]>maxfd)
1212                         maxfd = sockets[i];
1213         }
1214
1215         tv.tv_sec = 0;
1216         tv.tv_usec = connect_loop;
1217
1218         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1219
1220         if (res < 0)
1221                 goto done;
1222
1223         if (res == 0)
1224                 goto next_round;
1225
1226         for (i=0; i<num_addrs; i++) {
1227
1228                 if (sockets[i] == -1)
1229                         continue;
1230
1231                 /* Stevens, Network Programming says that if there's a
1232                  * successful connect, the socket is only writable. Upon an
1233                  * error, it's both readable and writable. */
1234
1235                 if (FD_ISSET(sockets[i], &r_fds) &&
1236                     FD_ISSET(sockets[i], &wr_fds)) {
1237                         /* readable and writable, so it's an error */
1238                         close(sockets[i]);
1239                         sockets[i] = -1;
1240                         continue;
1241                 }
1242
1243                 if (!FD_ISSET(sockets[i], &r_fds) &&
1244                     FD_ISSET(sockets[i], &wr_fds)) {
1245                         /* Only writable, so it's connected */
1246                         resulting_index = i;
1247                         goto done;
1248                 }
1249         }
1250
1251  next_round:
1252
1253         timeout -= connect_loop;
1254         if (timeout <= 0)
1255                 goto done;
1256         connect_loop *= 1.5;
1257         if (connect_loop > timeout)
1258                 connect_loop = timeout;
1259         goto connect_again;
1260
1261  done:
1262         for (i=0; i<num_addrs; i++) {
1263                 if (i == resulting_index)
1264                         continue;
1265                 if (sockets[i] >= 0)
1266                         close(sockets[i]);
1267         }
1268
1269         if (resulting_index >= 0) {
1270                 *fd_index = resulting_index;
1271                 *fd = sockets[*fd_index];
1272                 set_blocking(*fd, true);
1273         }
1274
1275         free(sockets);
1276
1277         return (resulting_index >= 0);
1278 }
1279 /****************************************************************************
1280  Open a connected UDP socket to host on port
1281 **************************************************************************/
1282
1283 int open_udp_socket(const char *host, int port)
1284 {
1285         struct sockaddr_storage ss;
1286         int res;
1287
1288         if (!interpret_string_addr(&ss, host, 0)) {
1289                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1290                         host));
1291                 return -1;
1292         }
1293
1294         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1295         if (res == -1) {
1296                 return -1;
1297         }
1298
1299 #if defined(HAVE_IPV6)
1300         if (ss.ss_family == AF_INET6) {
1301                 struct sockaddr_in6 *psa6;
1302                 psa6 = (struct sockaddr_in6 *)&ss;
1303                 psa6->sin6_port = htons(port);
1304                 if (psa6->sin6_scope_id == 0
1305                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1306                         setup_linklocal_scope_id(
1307                                 (struct sockaddr *)&ss);
1308                 }
1309         }
1310 #endif
1311         if (ss.ss_family == AF_INET) {
1312                 struct sockaddr_in *psa;
1313                 psa = (struct sockaddr_in *)&ss;
1314                 psa->sin_port = htons(port);
1315         }
1316
1317         if (sys_connect(res,(struct sockaddr *)&ss)) {
1318                 close(res);
1319                 return -1;
1320         }
1321
1322         return res;
1323 }
1324
1325 /*******************************************************************
1326  Return the IP addr of the remote end of a socket as a string.
1327  Optionally return the struct sockaddr_storage.
1328  ******************************************************************/
1329
1330 static const char *get_peer_addr_internal(int fd,
1331                                 char *addr_buf,
1332                                 size_t addr_buf_len,
1333                                 struct sockaddr *pss,
1334                                 socklen_t *plength)
1335 {
1336         struct sockaddr_storage ss;
1337         socklen_t length = sizeof(ss);
1338
1339         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1340
1341         if (fd == -1) {
1342                 return addr_buf;
1343         }
1344
1345         if (pss == NULL) {
1346                 pss = (struct sockaddr *)&ss;
1347                 plength = &length;
1348         }
1349
1350         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1351                 int level = (errno == ENOTCONN) ? 2 : 0;
1352                 DEBUG(level, ("getpeername failed. Error was %s\n",
1353                                strerror(errno)));
1354                 return addr_buf;
1355         }
1356
1357         print_sockaddr_len(addr_buf,
1358                         addr_buf_len,
1359                         pss,
1360                         *plength);
1361         return addr_buf;
1362 }
1363
1364 /*******************************************************************
1365  Matchname - determine if host name matches IP address. Used to
1366  confirm a hostname lookup to prevent spoof attacks.
1367 ******************************************************************/
1368
1369 static bool matchname(const char *remotehost,
1370                 const struct sockaddr *pss,
1371                 socklen_t len)
1372 {
1373         struct addrinfo *res = NULL;
1374         struct addrinfo *ailist = NULL;
1375         char addr_buf[INET6_ADDRSTRLEN];
1376         bool ret = interpret_string_addr_internal(&ailist,
1377                         remotehost,
1378                         AI_ADDRCONFIG|AI_CANONNAME);
1379
1380         if (!ret || ailist == NULL) {
1381                 DEBUG(3,("matchname: getaddrinfo failed for "
1382                         "name %s [%s]\n",
1383                         remotehost,
1384                         gai_strerror(ret) ));
1385                 return false;
1386         }
1387
1388         /*
1389          * Make sure that getaddrinfo() returns the "correct" host name.
1390          */
1391
1392         if (ailist->ai_canonname == NULL ||
1393                 (!strequal(remotehost, ailist->ai_canonname) &&
1394                  !strequal(remotehost, "localhost"))) {
1395                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1396                          remotehost,
1397                          ailist->ai_canonname ?
1398                                  ailist->ai_canonname : "(NULL)"));
1399                 freeaddrinfo(ailist);
1400                 return false;
1401         }
1402
1403         /* Look up the host address in the address list we just got. */
1404         for (res = ailist; res; res = res->ai_next) {
1405                 if (!res->ai_addr) {
1406                         continue;
1407                 }
1408                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1409                                         (struct sockaddr *)pss)) {
1410                         freeaddrinfo(ailist);
1411                         return true;
1412                 }
1413         }
1414
1415         /*
1416          * The host name does not map to the original host address. Perhaps
1417          * someone has compromised a name server. More likely someone botched
1418          * it, but that could be dangerous, too.
1419          */
1420
1421         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1422                 print_sockaddr_len(addr_buf,
1423                         sizeof(addr_buf),
1424                         pss,
1425                         len),
1426                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1427
1428         if (ailist) {
1429                 freeaddrinfo(ailist);
1430         }
1431         return false;
1432 }
1433
1434 /*******************************************************************
1435  Deal with the singleton cache.
1436 ******************************************************************/
1437
1438 struct name_addr_pair {
1439         struct sockaddr_storage ss;
1440         const char *name;
1441 };
1442
1443 /*******************************************************************
1444  Lookup a name/addr pair. Returns memory allocated from memcache.
1445 ******************************************************************/
1446
1447 static bool lookup_nc(struct name_addr_pair *nc)
1448 {
1449         DATA_BLOB tmp;
1450
1451         ZERO_STRUCTP(nc);
1452
1453         if (!memcache_lookup(
1454                         NULL, SINGLETON_CACHE,
1455                         data_blob_string_const_null("get_peer_name"),
1456                         &tmp)) {
1457                 return false;
1458         }
1459
1460         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1461         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1462         return true;
1463 }
1464
1465 /*******************************************************************
1466  Save a name/addr pair.
1467 ******************************************************************/
1468
1469 static void store_nc(const struct name_addr_pair *nc)
1470 {
1471         DATA_BLOB tmp;
1472         size_t namelen = strlen(nc->name);
1473
1474         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1475         if (!tmp.data) {
1476                 return;
1477         }
1478         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1479         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1480
1481         memcache_add(NULL, SINGLETON_CACHE,
1482                         data_blob_string_const_null("get_peer_name"),
1483                         tmp);
1484         data_blob_free(&tmp);
1485 }
1486
1487 /*******************************************************************
1488  Return the DNS name of the remote end of a socket.
1489 ******************************************************************/
1490
1491 const char *get_peer_name(int fd, bool force_lookup)
1492 {
1493         struct name_addr_pair nc;
1494         char addr_buf[INET6_ADDRSTRLEN];
1495         struct sockaddr_storage ss;
1496         socklen_t length = sizeof(ss);
1497         const char *p;
1498         int ret;
1499         char name_buf[MAX_DNS_NAME_LENGTH];
1500         char tmp_name[MAX_DNS_NAME_LENGTH];
1501
1502         /* reverse lookups can be *very* expensive, and in many
1503            situations won't work because many networks don't link dhcp
1504            with dns. To avoid the delay we avoid the lookup if
1505            possible */
1506         if (!lp_hostname_lookups() && (force_lookup == false)) {
1507                 length = sizeof(nc.ss);
1508                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1509                         (struct sockaddr *)&nc.ss, &length);
1510                 store_nc(&nc);
1511                 lookup_nc(&nc);
1512                 return nc.name ? nc.name : "UNKNOWN";
1513         }
1514
1515         lookup_nc(&nc);
1516
1517         memset(&ss, '\0', sizeof(ss));
1518         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1519
1520         /* it might be the same as the last one - save some DNS work */
1521         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1522                 return nc.name ? nc.name : "UNKNOWN";
1523         }
1524
1525         /* Not the same. We need to lookup. */
1526         if (fd == -1) {
1527                 return "UNKNOWN";
1528         }
1529
1530         /* Look up the remote host name. */
1531         ret = sys_getnameinfo((struct sockaddr *)&ss,
1532                         length,
1533                         name_buf,
1534                         sizeof(name_buf),
1535                         NULL,
1536                         0,
1537                         0);
1538
1539         if (ret) {
1540                 DEBUG(1,("get_peer_name: getnameinfo failed "
1541                         "for %s with error %s\n",
1542                         p,
1543                         gai_strerror(ret)));
1544                 strlcpy(name_buf, p, sizeof(name_buf));
1545         } else {
1546                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1547                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1548                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1549                 }
1550         }
1551
1552         /* can't pass the same source and dest strings in when you
1553            use --enable-developer or the clobber_region() call will
1554            get you */
1555
1556         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1557         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1558         if (strstr(name_buf,"..")) {
1559                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1560         }
1561
1562         nc.name = name_buf;
1563         nc.ss = ss;
1564
1565         store_nc(&nc);
1566         lookup_nc(&nc);
1567         return nc.name ? nc.name : "UNKNOWN";
1568 }
1569
1570 /*******************************************************************
1571  Return the IP addr of the remote end of a socket as a string.
1572  ******************************************************************/
1573
1574 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1575 {
1576         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1577 }
1578
1579 /*******************************************************************
1580  Create protected unix domain socket.
1581
1582  Some unixes cannot set permissions on a ux-dom-sock, so we
1583  have to make sure that the directory contains the protection
1584  permissions instead.
1585  ******************************************************************/
1586
1587 int create_pipe_sock(const char *socket_dir,
1588                      const char *socket_name,
1589                      mode_t dir_perms)
1590 {
1591 #ifdef HAVE_UNIXSOCKET
1592         struct sockaddr_un sunaddr;
1593         struct stat st;
1594         int sock;
1595         mode_t old_umask;
1596         char *path = NULL;
1597
1598         old_umask = umask(0);
1599
1600         /* Create the socket directory or reuse the existing one */
1601
1602         if (lstat(socket_dir, &st) == -1) {
1603                 if (errno == ENOENT) {
1604                         /* Create directory */
1605                         if (mkdir(socket_dir, dir_perms) == -1) {
1606                                 DEBUG(0, ("error creating socket directory "
1607                                         "%s: %s\n", socket_dir,
1608                                         strerror(errno)));
1609                                 goto out_umask;
1610                         }
1611                 } else {
1612                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1613                                 socket_dir, strerror(errno)));
1614                         goto out_umask;
1615                 }
1616         } else {
1617                 /* Check ownership and permission on existing directory */
1618                 if (!S_ISDIR(st.st_mode)) {
1619                         DEBUG(0, ("socket directory %s isn't a directory\n",
1620                                 socket_dir));
1621                         goto out_umask;
1622                 }
1623                 if ((st.st_uid != sec_initial_uid()) ||
1624                                 ((st.st_mode & 0777) != dir_perms)) {
1625                         DEBUG(0, ("invalid permissions on socket directory "
1626                                 "%s\n", socket_dir));
1627                         goto out_umask;
1628                 }
1629         }
1630
1631         /* Create the socket file */
1632
1633         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1634
1635         if (sock == -1) {
1636                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1637                         strerror(errno) ));
1638                 goto out_close;
1639         }
1640
1641         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1642                 goto out_close;
1643         }
1644
1645         unlink(path);
1646         memset(&sunaddr, 0, sizeof(sunaddr));
1647         sunaddr.sun_family = AF_UNIX;
1648         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1649
1650         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1651                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1652                         strerror(errno)));
1653                 goto out_close;
1654         }
1655
1656         if (listen(sock, 5) == -1) {
1657                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1658                         strerror(errno)));
1659                 goto out_close;
1660         }
1661
1662         SAFE_FREE(path);
1663
1664         umask(old_umask);
1665         return sock;
1666
1667 out_close:
1668         SAFE_FREE(path);
1669         if (sock != -1)
1670                 close(sock);
1671
1672 out_umask:
1673         umask(old_umask);
1674         return -1;
1675
1676 #else
1677         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1678         return -1;
1679 #endif /* HAVE_UNIXSOCKET */
1680 }
1681
1682 /****************************************************************************
1683  Get my own canonical name, including domain.
1684 ****************************************************************************/
1685
1686 const char *get_mydnsfullname(void)
1687 {
1688         struct addrinfo *res = NULL;
1689         char my_hostname[HOST_NAME_MAX];
1690         bool ret;
1691         DATA_BLOB tmp;
1692
1693         if (memcache_lookup(NULL, SINGLETON_CACHE,
1694                         data_blob_string_const_null("get_mydnsfullname"),
1695                         &tmp)) {
1696                 SMB_ASSERT(tmp.length > 0);
1697                 return (const char *)tmp.data;
1698         }
1699
1700         /* get my host name */
1701         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1702                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1703                 return NULL;
1704         }
1705
1706         /* Ensure null termination. */
1707         my_hostname[sizeof(my_hostname)-1] = '\0';
1708
1709         ret = interpret_string_addr_internal(&res,
1710                                 my_hostname,
1711                                 AI_ADDRCONFIG|AI_CANONNAME);
1712
1713         if (!ret || res == NULL) {
1714                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1715                         "name %s [%s]\n",
1716                         my_hostname,
1717                         gai_strerror(ret) ));
1718                 return NULL;
1719         }
1720
1721         /*
1722          * Make sure that getaddrinfo() returns the "correct" host name.
1723          */
1724
1725         if (res->ai_canonname == NULL) {
1726                 DEBUG(3,("get_mydnsfullname: failed to get "
1727                         "canonical name for %s\n",
1728                         my_hostname));
1729                 freeaddrinfo(res);
1730                 return NULL;
1731         }
1732
1733         /* This copies the data, so we must do a lookup
1734          * afterwards to find the value to return.
1735          */
1736
1737         memcache_add(NULL, SINGLETON_CACHE,
1738                         data_blob_string_const_null("get_mydnsfullname"),
1739                         data_blob_string_const_null(res->ai_canonname));
1740
1741         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1742                         data_blob_string_const_null("get_mydnsfullname"),
1743                         &tmp)) {
1744                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1745                                 strlen(res->ai_canonname) + 1);
1746         }
1747
1748         freeaddrinfo(res);
1749
1750         return (const char *)tmp.data;
1751 }
1752
1753 /************************************************************
1754  Is this my name ?
1755 ************************************************************/
1756
1757 bool is_myname_or_ipaddr(const char *s)
1758 {
1759         TALLOC_CTX *ctx = talloc_tos();
1760         char addr[INET6_ADDRSTRLEN];
1761         char *name = NULL;
1762         const char *dnsname;
1763         char *servername = NULL;
1764
1765         if (!s) {
1766                 return false;
1767         }
1768
1769         /* Santize the string from '\\name' */
1770         name = talloc_strdup(ctx, s);
1771         if (!name) {
1772                 return false;
1773         }
1774
1775         servername = strrchr_m(name, '\\' );
1776         if (!servername) {
1777                 servername = name;
1778         } else {
1779                 servername++;
1780         }
1781
1782         /* Optimize for the common case */
1783         if (strequal(servername, global_myname())) {
1784                 return true;
1785         }
1786
1787         /* Check for an alias */
1788         if (is_myname(servername)) {
1789                 return true;
1790         }
1791
1792         /* Check for loopback */
1793         if (strequal(servername, "127.0.0.1") ||
1794                         strequal(servername, "::1")) {
1795                 return true;
1796         }
1797
1798         if (strequal(servername, "localhost")) {
1799                 return true;
1800         }
1801
1802         /* Maybe it's my dns name */
1803         dnsname = get_mydnsfullname();
1804         if (dnsname && strequal(servername, dnsname)) {
1805                 return true;
1806         }
1807
1808         /* Handle possible CNAME records - convert to an IP addr. */
1809         if (!is_ipaddress(servername)) {
1810                 /* Use DNS to resolve the name, but only the first address */
1811                 struct sockaddr_storage ss;
1812                 if (interpret_string_addr(&ss, servername, 0)) {
1813                         print_sockaddr(addr,
1814                                         sizeof(addr),
1815                                         &ss);
1816                         servername = addr;
1817                 }
1818         }
1819
1820         /* Maybe its an IP address? */
1821         if (is_ipaddress(servername)) {
1822                 struct sockaddr_storage ss;
1823                 struct iface_struct *nics;
1824                 int i, n;
1825
1826                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1827                         return false;
1828                 }
1829
1830                 if (ismyaddr((struct sockaddr *)&ss)) {
1831                         return true;
1832                 }
1833
1834                 if (is_zero_addr((struct sockaddr *)&ss) ||
1835                         is_loopback_addr((struct sockaddr *)&ss)) {
1836                         return false;
1837                 }
1838
1839                 n = get_interfaces(talloc_tos(), &nics);
1840                 for (i=0; i<n; i++) {
1841                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1842                                 TALLOC_FREE(nics);
1843                                 return true;
1844                         }
1845                 }
1846                 TALLOC_FREE(nics);
1847         }
1848
1849         /* No match */
1850         return false;
1851 }
1852
1853 struct getaddrinfo_state {
1854         const char *node;
1855         const char *service;
1856         const struct addrinfo *hints;
1857         struct addrinfo *res;
1858         int ret;
1859 };
1860
1861 static void getaddrinfo_do(void *private_data);
1862 static void getaddrinfo_done(struct tevent_req *subreq);
1863
1864 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1865                                     struct tevent_context *ev,
1866                                     struct fncall_context *ctx,
1867                                     const char *node,
1868                                     const char *service,
1869                                     const struct addrinfo *hints)
1870 {
1871         struct tevent_req *req, *subreq;
1872         struct getaddrinfo_state *state;
1873
1874         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1875         if (req == NULL) {
1876                 return NULL;
1877         }
1878
1879         state->node = node;
1880         state->service = service;
1881         state->hints = hints;
1882
1883         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1884         if (tevent_req_nomem(subreq, req)) {
1885                 return tevent_req_post(req, ev);
1886         }
1887         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1888         return req;
1889 }
1890
1891 static void getaddrinfo_do(void *private_data)
1892 {
1893         struct getaddrinfo_state *state =
1894                 (struct getaddrinfo_state *)private_data;
1895
1896         state->ret = getaddrinfo(state->node, state->service, state->hints,
1897                                  &state->res);
1898 }
1899
1900 static void getaddrinfo_done(struct tevent_req *subreq)
1901 {
1902         struct tevent_req *req = tevent_req_callback_data(
1903                 subreq, struct tevent_req);
1904         int ret, err;
1905
1906         ret = fncall_recv(subreq, &err);
1907         TALLOC_FREE(subreq);
1908         if (ret == -1) {
1909                 tevent_req_error(req, err);
1910                 return;
1911         }
1912         tevent_req_done(req);
1913 }
1914
1915 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1916 {
1917         struct getaddrinfo_state *state = tevent_req_data(
1918                 req, struct getaddrinfo_state);
1919         int err;
1920
1921         if (tevent_req_is_unix_error(req, &err)) {
1922                 switch(err) {
1923                 case ENOMEM:
1924                         return EAI_MEMORY;
1925                 default:
1926                         return EAI_FAIL;
1927                 }
1928         }
1929         if (state->ret == 0) {
1930                 *res = state->res;
1931         }
1932         return state->ret;
1933 }