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, ("getsockname 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  Open a connected UDP socket to host on port
1116 **************************************************************************/
1117
1118 int open_udp_socket(const char *host, int port)
1119 {
1120         struct sockaddr_storage ss;
1121         int res;
1122
1123         if (!interpret_string_addr(&ss, host, 0)) {
1124                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1125                         host));
1126                 return -1;
1127         }
1128
1129         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1130         if (res == -1) {
1131                 return -1;
1132         }
1133
1134 #if defined(HAVE_IPV6)
1135         if (ss.ss_family == AF_INET6) {
1136                 struct sockaddr_in6 *psa6;
1137                 psa6 = (struct sockaddr_in6 *)&ss;
1138                 psa6->sin6_port = htons(port);
1139                 if (psa6->sin6_scope_id == 0
1140                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1141                         setup_linklocal_scope_id(
1142                                 (struct sockaddr *)&ss);
1143                 }
1144         }
1145 #endif
1146         if (ss.ss_family == AF_INET) {
1147                 struct sockaddr_in *psa;
1148                 psa = (struct sockaddr_in *)&ss;
1149                 psa->sin_port = htons(port);
1150         }
1151
1152         if (sys_connect(res,(struct sockaddr *)&ss)) {
1153                 close(res);
1154                 return -1;
1155         }
1156
1157         return res;
1158 }
1159
1160 /*******************************************************************
1161  Return the IP addr of the remote end of a socket as a string.
1162  Optionally return the struct sockaddr_storage.
1163  ******************************************************************/
1164
1165 static const char *get_peer_addr_internal(int fd,
1166                                 char *addr_buf,
1167                                 size_t addr_buf_len,
1168                                 struct sockaddr *pss,
1169                                 socklen_t *plength)
1170 {
1171         struct sockaddr_storage ss;
1172         socklen_t length = sizeof(ss);
1173
1174         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1175
1176         if (fd == -1) {
1177                 return addr_buf;
1178         }
1179
1180         if (pss == NULL) {
1181                 pss = (struct sockaddr *)&ss;
1182                 plength = &length;
1183         }
1184
1185         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1186                 int level = (errno == ENOTCONN) ? 2 : 0;
1187                 DEBUG(level, ("getpeername failed. Error was %s\n",
1188                                strerror(errno)));
1189                 return addr_buf;
1190         }
1191
1192         print_sockaddr_len(addr_buf,
1193                         addr_buf_len,
1194                         pss,
1195                         *plength);
1196         return addr_buf;
1197 }
1198
1199 /*******************************************************************
1200  Matchname - determine if host name matches IP address. Used to
1201  confirm a hostname lookup to prevent spoof attacks.
1202 ******************************************************************/
1203
1204 static bool matchname(const char *remotehost,
1205                 const struct sockaddr *pss,
1206                 socklen_t len)
1207 {
1208         struct addrinfo *res = NULL;
1209         struct addrinfo *ailist = NULL;
1210         char addr_buf[INET6_ADDRSTRLEN];
1211         bool ret = interpret_string_addr_internal(&ailist,
1212                         remotehost,
1213                         AI_ADDRCONFIG|AI_CANONNAME);
1214
1215         if (!ret || ailist == NULL) {
1216                 DEBUG(3,("matchname: getaddrinfo failed for "
1217                         "name %s [%s]\n",
1218                         remotehost,
1219                         gai_strerror(ret) ));
1220                 return false;
1221         }
1222
1223         /*
1224          * Make sure that getaddrinfo() returns the "correct" host name.
1225          */
1226
1227         if (ailist->ai_canonname == NULL ||
1228                 (!strequal(remotehost, ailist->ai_canonname) &&
1229                  !strequal(remotehost, "localhost"))) {
1230                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1231                          remotehost,
1232                          ailist->ai_canonname ?
1233                                  ailist->ai_canonname : "(NULL)"));
1234                 freeaddrinfo(ailist);
1235                 return false;
1236         }
1237
1238         /* Look up the host address in the address list we just got. */
1239         for (res = ailist; res; res = res->ai_next) {
1240                 if (!res->ai_addr) {
1241                         continue;
1242                 }
1243                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1244                                         (struct sockaddr *)pss)) {
1245                         freeaddrinfo(ailist);
1246                         return true;
1247                 }
1248         }
1249
1250         /*
1251          * The host name does not map to the original host address. Perhaps
1252          * someone has compromised a name server. More likely someone botched
1253          * it, but that could be dangerous, too.
1254          */
1255
1256         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1257                 print_sockaddr_len(addr_buf,
1258                         sizeof(addr_buf),
1259                         pss,
1260                         len),
1261                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1262
1263         if (ailist) {
1264                 freeaddrinfo(ailist);
1265         }
1266         return false;
1267 }
1268
1269 /*******************************************************************
1270  Deal with the singleton cache.
1271 ******************************************************************/
1272
1273 struct name_addr_pair {
1274         struct sockaddr_storage ss;
1275         const char *name;
1276 };
1277
1278 /*******************************************************************
1279  Lookup a name/addr pair. Returns memory allocated from memcache.
1280 ******************************************************************/
1281
1282 static bool lookup_nc(struct name_addr_pair *nc)
1283 {
1284         DATA_BLOB tmp;
1285
1286         ZERO_STRUCTP(nc);
1287
1288         if (!memcache_lookup(
1289                         NULL, SINGLETON_CACHE,
1290                         data_blob_string_const_null("get_peer_name"),
1291                         &tmp)) {
1292                 return false;
1293         }
1294
1295         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1296         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1297         return true;
1298 }
1299
1300 /*******************************************************************
1301  Save a name/addr pair.
1302 ******************************************************************/
1303
1304 static void store_nc(const struct name_addr_pair *nc)
1305 {
1306         DATA_BLOB tmp;
1307         size_t namelen = strlen(nc->name);
1308
1309         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1310         if (!tmp.data) {
1311                 return;
1312         }
1313         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1314         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1315
1316         memcache_add(NULL, SINGLETON_CACHE,
1317                         data_blob_string_const_null("get_peer_name"),
1318                         tmp);
1319         data_blob_free(&tmp);
1320 }
1321
1322 /*******************************************************************
1323  Return the DNS name of the remote end of a socket.
1324 ******************************************************************/
1325
1326 const char *get_peer_name(int fd, bool force_lookup)
1327 {
1328         struct name_addr_pair nc;
1329         char addr_buf[INET6_ADDRSTRLEN];
1330         struct sockaddr_storage ss;
1331         socklen_t length = sizeof(ss);
1332         const char *p;
1333         int ret;
1334         char name_buf[MAX_DNS_NAME_LENGTH];
1335         char tmp_name[MAX_DNS_NAME_LENGTH];
1336
1337         /* reverse lookups can be *very* expensive, and in many
1338            situations won't work because many networks don't link dhcp
1339            with dns. To avoid the delay we avoid the lookup if
1340            possible */
1341         if (!lp_hostname_lookups() && (force_lookup == false)) {
1342                 length = sizeof(nc.ss);
1343                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1344                         (struct sockaddr *)&nc.ss, &length);
1345                 store_nc(&nc);
1346                 lookup_nc(&nc);
1347                 return nc.name ? nc.name : "UNKNOWN";
1348         }
1349
1350         lookup_nc(&nc);
1351
1352         memset(&ss, '\0', sizeof(ss));
1353         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1354
1355         /* it might be the same as the last one - save some DNS work */
1356         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1357                 return nc.name ? nc.name : "UNKNOWN";
1358         }
1359
1360         /* Not the same. We need to lookup. */
1361         if (fd == -1) {
1362                 return "UNKNOWN";
1363         }
1364
1365         /* Look up the remote host name. */
1366         ret = sys_getnameinfo((struct sockaddr *)&ss,
1367                         length,
1368                         name_buf,
1369                         sizeof(name_buf),
1370                         NULL,
1371                         0,
1372                         0);
1373
1374         if (ret) {
1375                 DEBUG(1,("get_peer_name: getnameinfo failed "
1376                         "for %s with error %s\n",
1377                         p,
1378                         gai_strerror(ret)));
1379                 strlcpy(name_buf, p, sizeof(name_buf));
1380         } else {
1381                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1382                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1383                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1384                 }
1385         }
1386
1387         /* can't pass the same source and dest strings in when you
1388            use --enable-developer or the clobber_region() call will
1389            get you */
1390
1391         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1392         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1393         if (strstr(name_buf,"..")) {
1394                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1395         }
1396
1397         nc.name = name_buf;
1398         nc.ss = ss;
1399
1400         store_nc(&nc);
1401         lookup_nc(&nc);
1402         return nc.name ? nc.name : "UNKNOWN";
1403 }
1404
1405 /*******************************************************************
1406  Return the IP addr of the remote end of a socket as a string.
1407  ******************************************************************/
1408
1409 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1410 {
1411         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1412 }
1413
1414 /*******************************************************************
1415  Create protected unix domain socket.
1416
1417  Some unixes cannot set permissions on a ux-dom-sock, so we
1418  have to make sure that the directory contains the protection
1419  permissions instead.
1420  ******************************************************************/
1421
1422 int create_pipe_sock(const char *socket_dir,
1423                      const char *socket_name,
1424                      mode_t dir_perms)
1425 {
1426 #ifdef HAVE_UNIXSOCKET
1427         struct sockaddr_un sunaddr;
1428         struct stat st;
1429         int sock;
1430         mode_t old_umask;
1431         char *path = NULL;
1432
1433         old_umask = umask(0);
1434
1435         /* Create the socket directory or reuse the existing one */
1436
1437         if (lstat(socket_dir, &st) == -1) {
1438                 if (errno == ENOENT) {
1439                         /* Create directory */
1440                         if (mkdir(socket_dir, dir_perms) == -1) {
1441                                 DEBUG(0, ("error creating socket directory "
1442                                         "%s: %s\n", socket_dir,
1443                                         strerror(errno)));
1444                                 goto out_umask;
1445                         }
1446                 } else {
1447                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1448                                 socket_dir, strerror(errno)));
1449                         goto out_umask;
1450                 }
1451         } else {
1452                 /* Check ownership and permission on existing directory */
1453                 if (!S_ISDIR(st.st_mode)) {
1454                         DEBUG(0, ("socket directory %s isn't a directory\n",
1455                                 socket_dir));
1456                         goto out_umask;
1457                 }
1458                 if ((st.st_uid != sec_initial_uid()) ||
1459                                 ((st.st_mode & 0777) != dir_perms)) {
1460                         DEBUG(0, ("invalid permissions on socket directory "
1461                                 "%s\n", socket_dir));
1462                         goto out_umask;
1463                 }
1464         }
1465
1466         /* Create the socket file */
1467
1468         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1469
1470         if (sock == -1) {
1471                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1472                         strerror(errno) ));
1473                 goto out_close;
1474         }
1475
1476         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1477                 goto out_close;
1478         }
1479
1480         unlink(path);
1481         memset(&sunaddr, 0, sizeof(sunaddr));
1482         sunaddr.sun_family = AF_UNIX;
1483         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1484
1485         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1486                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1487                         strerror(errno)));
1488                 goto out_close;
1489         }
1490
1491         if (listen(sock, 5) == -1) {
1492                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1493                         strerror(errno)));
1494                 goto out_close;
1495         }
1496
1497         SAFE_FREE(path);
1498
1499         umask(old_umask);
1500         return sock;
1501
1502 out_close:
1503         SAFE_FREE(path);
1504         if (sock != -1)
1505                 close(sock);
1506
1507 out_umask:
1508         umask(old_umask);
1509         return -1;
1510
1511 #else
1512         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1513         return -1;
1514 #endif /* HAVE_UNIXSOCKET */
1515 }
1516
1517 /****************************************************************************
1518  Get my own canonical name, including domain.
1519 ****************************************************************************/
1520
1521 const char *get_mydnsfullname(void)
1522 {
1523         struct addrinfo *res = NULL;
1524         char my_hostname[HOST_NAME_MAX];
1525         bool ret;
1526         DATA_BLOB tmp;
1527
1528         if (memcache_lookup(NULL, SINGLETON_CACHE,
1529                         data_blob_string_const_null("get_mydnsfullname"),
1530                         &tmp)) {
1531                 SMB_ASSERT(tmp.length > 0);
1532                 return (const char *)tmp.data;
1533         }
1534
1535         /* get my host name */
1536         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1537                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1538                 return NULL;
1539         }
1540
1541         /* Ensure null termination. */
1542         my_hostname[sizeof(my_hostname)-1] = '\0';
1543
1544         ret = interpret_string_addr_internal(&res,
1545                                 my_hostname,
1546                                 AI_ADDRCONFIG|AI_CANONNAME);
1547
1548         if (!ret || res == NULL) {
1549                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1550                         "name %s [%s]\n",
1551                         my_hostname,
1552                         gai_strerror(ret) ));
1553                 return NULL;
1554         }
1555
1556         /*
1557          * Make sure that getaddrinfo() returns the "correct" host name.
1558          */
1559
1560         if (res->ai_canonname == NULL) {
1561                 DEBUG(3,("get_mydnsfullname: failed to get "
1562                         "canonical name for %s\n",
1563                         my_hostname));
1564                 freeaddrinfo(res);
1565                 return NULL;
1566         }
1567
1568         /* This copies the data, so we must do a lookup
1569          * afterwards to find the value to return.
1570          */
1571
1572         memcache_add(NULL, SINGLETON_CACHE,
1573                         data_blob_string_const_null("get_mydnsfullname"),
1574                         data_blob_string_const_null(res->ai_canonname));
1575
1576         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1577                         data_blob_string_const_null("get_mydnsfullname"),
1578                         &tmp)) {
1579                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1580                                 strlen(res->ai_canonname) + 1);
1581         }
1582
1583         freeaddrinfo(res);
1584
1585         return (const char *)tmp.data;
1586 }
1587
1588 /************************************************************
1589  Is this my name ?
1590 ************************************************************/
1591
1592 bool is_myname_or_ipaddr(const char *s)
1593 {
1594         TALLOC_CTX *ctx = talloc_tos();
1595         char addr[INET6_ADDRSTRLEN];
1596         char *name = NULL;
1597         const char *dnsname;
1598         char *servername = NULL;
1599
1600         if (!s) {
1601                 return false;
1602         }
1603
1604         /* Santize the string from '\\name' */
1605         name = talloc_strdup(ctx, s);
1606         if (!name) {
1607                 return false;
1608         }
1609
1610         servername = strrchr_m(name, '\\' );
1611         if (!servername) {
1612                 servername = name;
1613         } else {
1614                 servername++;
1615         }
1616
1617         /* Optimize for the common case */
1618         if (strequal(servername, global_myname())) {
1619                 return true;
1620         }
1621
1622         /* Check for an alias */
1623         if (is_myname(servername)) {
1624                 return true;
1625         }
1626
1627         /* Check for loopback */
1628         if (strequal(servername, "127.0.0.1") ||
1629                         strequal(servername, "::1")) {
1630                 return true;
1631         }
1632
1633         if (strequal(servername, "localhost")) {
1634                 return true;
1635         }
1636
1637         /* Maybe it's my dns name */
1638         dnsname = get_mydnsfullname();
1639         if (dnsname && strequal(servername, dnsname)) {
1640                 return true;
1641         }
1642
1643         /* Handle possible CNAME records - convert to an IP addr. */
1644         if (!is_ipaddress(servername)) {
1645                 /* Use DNS to resolve the name, but only the first address */
1646                 struct sockaddr_storage ss;
1647                 if (interpret_string_addr(&ss, servername, 0)) {
1648                         print_sockaddr(addr,
1649                                         sizeof(addr),
1650                                         &ss);
1651                         servername = addr;
1652                 }
1653         }
1654
1655         /* Maybe its an IP address? */
1656         if (is_ipaddress(servername)) {
1657                 struct sockaddr_storage ss;
1658                 struct iface_struct *nics;
1659                 int i, n;
1660
1661                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1662                         return false;
1663                 }
1664
1665                 if (ismyaddr((struct sockaddr *)&ss)) {
1666                         return true;
1667                 }
1668
1669                 if (is_zero_addr(&ss) ||
1670                         is_loopback_addr((struct sockaddr *)&ss)) {
1671                         return false;
1672                 }
1673
1674                 n = get_interfaces(talloc_tos(), &nics);
1675                 for (i=0; i<n; i++) {
1676                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1677                                 TALLOC_FREE(nics);
1678                                 return true;
1679                         }
1680                 }
1681                 TALLOC_FREE(nics);
1682         }
1683
1684         /* No match */
1685         return false;
1686 }
1687
1688 struct getaddrinfo_state {
1689         const char *node;
1690         const char *service;
1691         const struct addrinfo *hints;
1692         struct addrinfo *res;
1693         int ret;
1694 };
1695
1696 static void getaddrinfo_do(void *private_data);
1697 static void getaddrinfo_done(struct tevent_req *subreq);
1698
1699 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1700                                     struct tevent_context *ev,
1701                                     struct fncall_context *ctx,
1702                                     const char *node,
1703                                     const char *service,
1704                                     const struct addrinfo *hints)
1705 {
1706         struct tevent_req *req, *subreq;
1707         struct getaddrinfo_state *state;
1708
1709         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1710         if (req == NULL) {
1711                 return NULL;
1712         }
1713
1714         state->node = node;
1715         state->service = service;
1716         state->hints = hints;
1717
1718         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1719         if (tevent_req_nomem(subreq, req)) {
1720                 return tevent_req_post(req, ev);
1721         }
1722         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1723         return req;
1724 }
1725
1726 static void getaddrinfo_do(void *private_data)
1727 {
1728         struct getaddrinfo_state *state =
1729                 (struct getaddrinfo_state *)private_data;
1730
1731         state->ret = getaddrinfo(state->node, state->service, state->hints,
1732                                  &state->res);
1733 }
1734
1735 static void getaddrinfo_done(struct tevent_req *subreq)
1736 {
1737         struct tevent_req *req = tevent_req_callback_data(
1738                 subreq, struct tevent_req);
1739         int ret, err;
1740
1741         ret = fncall_recv(subreq, &err);
1742         TALLOC_FREE(subreq);
1743         if (ret == -1) {
1744                 tevent_req_error(req, err);
1745                 return;
1746         }
1747         tevent_req_done(req);
1748 }
1749
1750 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1751 {
1752         struct getaddrinfo_state *state = tevent_req_data(
1753                 req, struct getaddrinfo_state);
1754         int err;
1755
1756         if (tevent_req_is_unix_error(req, &err)) {
1757                 switch(err) {
1758                 case ENOMEM:
1759                         return EAI_MEMORY;
1760                 default:
1761                         return EAI_FAIL;
1762                 }
1763         }
1764         if (state->ret == 0) {
1765                 *res = state->res;
1766         }
1767         return state->ret;
1768 }