source3/lib/util_sock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Tim Potter      2000-2001
   6    Copyright (C) Jeremy Allison  1992-2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /****************************************************************************
  25  Get a port number in host byte order from a sockaddr_storage.
  26 ****************************************************************************/
  27
  28 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
  29 {
  30         uint16_t port = 0;
  31
  32         if (pss->ss_family != AF_INET) {
  33 #if defined(HAVE_IPV6)
  34                 /* IPv6 */
  35                 const struct sockaddr_in6 *sa6 =
  36                         (const struct sockaddr_in6 *)pss;
  37                 port = ntohs(sa6->sin6_port);
  38 #endif
  39         } else {
  40                 const struct sockaddr_in *sa =
  41                         (const struct sockaddr_in *)pss;
  42                 port = ntohs(sa->sin_port);
  43         }
  44         return port;
  45 }
  46
  47 /****************************************************************************
  48  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
  49 ****************************************************************************/
  50
  51 static char *print_sockaddr_len(char *dest,
  52                         size_t destlen,
  53                         const struct sockaddr *psa,
  54                         socklen_t psalen)
  55 {
  56         if (destlen > 0) {
  57                 dest[0] = '\0';
  58         }
  59         (void)sys_getnameinfo(psa,
  60                         psalen,
  61                         dest, destlen,
  62                         NULL, 0,
  63                         NI_NUMERICHOST);
  64         return dest;
  65 }
  66
  67 /****************************************************************************
  68  Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
  69 ****************************************************************************/
  70
  71 char *print_sockaddr(char *dest,
  72                         size_t destlen,
  73                         const struct sockaddr_storage *psa)
  74 {
  75         return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
  76                         sizeof(struct sockaddr_storage));
  77 }
  78
  79 /****************************************************************************
  80  Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
  81 ****************************************************************************/
  82
  83 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
  84                         const struct sockaddr_storage *pss)
  85 {
  86         char addr[INET6_ADDRSTRLEN];
  87         char *dest = NULL;
  88         int ret;
  89
  90         /* Linux getnameinfo() man pages says port is unitialized if
  91            service name is NULL. */
  92
  93         ret = sys_getnameinfo((const struct sockaddr *)pss,
  94                         sizeof(struct sockaddr_storage),
  95                         addr, sizeof(addr),
  96                         NULL, 0,
  97                         NI_NUMERICHOST);
  98         if (ret != 0) {
  99                 return NULL;
 100         }
 101
 102         if (pss->ss_family != AF_INET) {
 103 #if defined(HAVE_IPV6)
 104                 dest = talloc_asprintf(ctx, "[%s]", addr);
 105 #else
 106                 return NULL;
 107 #endif
 108         } else {
 109                 dest = talloc_asprintf(ctx, "%s", addr);
 110         }
 111
 112         return dest;
 113 }
 114
 115 /****************************************************************************
 116  Return the string of an IP address (IPv4 or IPv6).
 117 ****************************************************************************/
 118
 119 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
 120 {
 121         struct sockaddr_storage sa;
 122         socklen_t length = sizeof(sa);
 123
 124         /* Ok, returning a hard coded IPv4 address
 125          * is bogus, but it's just as bogus as a
 126          * zero IPv6 address. No good choice here.
 127          */
 128
 129         strlcpy(addr_buf, "0.0.0.0", addr_len);
 130
 131         if (fd == -1) {
 132                 return addr_buf;
 133         }
 134
 135         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 136                 DEBUG(0,("getsockname failed. Error was %s\n",
 137                         strerror(errno) ));
 138                 return addr_buf;
 139         }
 140
 141         return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
 142 }
 143
 144 /****************************************************************************
 145  Return the port number we've bound to on a socket.
 146 ****************************************************************************/
 147
 148 int get_socket_port(int fd)
 149 {
 150         struct sockaddr_storage sa;
 151         socklen_t length = sizeof(sa);
 152
 153         if (fd == -1) {
 154                 return -1;
 155         }
 156
 157         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
 158                 int level = (errno == ENOTCONN) ? 2 : 0;
 159                 DEBUG(level, ("getpeername failed. Error was %s\n",
 160                                strerror(errno)));
 161                 return -1;
 162         }
 163
 164 #if defined(HAVE_IPV6)
 165         if (sa.ss_family == AF_INET6) {
 166                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
 167         }
 168 #endif
 169         if (sa.ss_family == AF_INET) {
 170                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
 171         }
 172         return -1;
 173 }
 174
 175 const char *client_name(int fd)
 176 {
 177         return get_peer_name(fd,false);
 178 }
 179
 180 const char *client_addr(int fd, char *addr, size_t addrlen)
 181 {
 182         return get_peer_addr(fd,addr,addrlen);
 183 }
 184
 185 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
 186 {
 187         return get_socket_addr(fd, addr, addr_len);
 188 }
 189
 190 #if 0
 191 /* Not currently used. JRA. */
 192 int client_socket_port(int fd)
 193 {
 194         return get_socket_port(fd);
 195 }
 196 #endif
 197
 198 /****************************************************************************
 199  Accessor functions to make thread-safe code easier later...
 200 ****************************************************************************/
 201
 202 void set_smb_read_error(enum smb_read_errors *pre,
 203                         enum smb_read_errors newerr)
 204 {
 205         if (pre) {
 206                 *pre = newerr;
 207         }
 208 }
 209
 210 void cond_set_smb_read_error(enum smb_read_errors *pre,
 211                         enum smb_read_errors newerr)
 212 {
 213         if (pre && *pre == SMB_READ_OK) {
 214                 *pre = newerr;
 215         }
 216 }
 217
 218 /****************************************************************************
 219  Determine if a file descriptor is in fact a socket.
 220 ****************************************************************************/
 221
 222 bool is_a_socket(int fd)
 223 {
 224         int v;
 225         socklen_t l;
 226         l = sizeof(int);
 227         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
 228 }
 229
 230 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
 231
 232 typedef struct smb_socket_option {
 233         const char *name;
 234         int level;
 235         int option;
 236         int value;
 237         int opttype;
 238 } smb_socket_option;
 239
 240 static const smb_socket_option socket_options[] = {
 241   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
 242   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
 243   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
 244 #ifdef TCP_NODELAY
 245   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
 246 #endif
 247 #ifdef TCP_KEEPCNT
 248   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
 249 #endif
 250 #ifdef TCP_KEEPIDLE
 251   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
 252 #endif
 253 #ifdef TCP_KEEPINTVL
 254   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
 255 #endif
 256 #ifdef IPTOS_LOWDELAY
 257   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
 258 #endif
 259 #ifdef IPTOS_THROUGHPUT
 260   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
 261 #endif
 262 #ifdef SO_REUSEPORT
 263   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
 264 #endif
 265 #ifdef SO_SNDBUF
 266   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
 267 #endif
 268 #ifdef SO_RCVBUF
 269   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
 270 #endif
 271 #ifdef SO_SNDLOWAT
 272   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
 273 #endif
 274 #ifdef SO_RCVLOWAT
 275   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
 276 #endif
 277 #ifdef SO_SNDTIMEO
 278   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
 279 #endif
 280 #ifdef SO_RCVTIMEO
 281   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
 282 #endif
 283 #ifdef TCP_FASTACK
 284   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
 285 #endif
 286 #ifdef TCP_QUICKACK
 287   {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL},
 288 #endif
 289   {NULL,0,0,0,0}};
 290
 291 /****************************************************************************
 292  Print socket options.
 293 ****************************************************************************/
 294
 295 static void print_socket_options(int s)
 296 {
 297         int value;
 298         socklen_t vlen = 4;
 299         const smb_socket_option *p = &socket_options[0];
 300
 301         /* wrapped in if statement to prevent streams
 302          * leak in SCO Openserver 5.0 */
 303         /* reported on samba-technical  --jerry */
 304         if ( DEBUGLEVEL >= 5 ) {
 305                 DEBUG(5,("Socket options:\n"));
 306                 for (; p->name != NULL; p++) {
 307                         if (getsockopt(s, p->level, p->option,
 308                                                 (void *)&value, &vlen) == -1) {
 309                                 DEBUGADD(5,("\tCould not test socket option %s.\n",
 310                                                         p->name));
 311                         } else {
 312                                 DEBUGADD(5,("\t%s = %d\n",
 313                                                         p->name,value));
 314                         }
 315                 }
 316         }
 317  }
 318
 319 /****************************************************************************
 320  Set user socket options.
 321 ****************************************************************************/
 322
 323 void set_socket_options(int fd, const char *options)
 324 {
 325         TALLOC_CTX *ctx = talloc_stackframe();
 326         char *tok;
 327
 328         while (next_token_talloc(ctx, &options, &tok," \t,")) {
 329                 int ret=0,i;
 330                 int value = 1;
 331                 char *p;
 332                 bool got_value = false;
 333
 334                 if ((p = strchr_m(tok,'='))) {
 335                         *p = 0;
 336                         value = atoi(p+1);
 337                         got_value = true;
 338                 }
 339
 340                 for (i=0;socket_options[i].name;i++)
 341                         if (strequal(socket_options[i].name,tok))
 342                                 break;
 343
 344                 if (!socket_options[i].name) {
 345                         DEBUG(0,("Unknown socket option %s\n",tok));
 346                         continue;
 347                 }
 348
 349                 switch (socket_options[i].opttype) {
 350                 case OPT_BOOL:
 351                 case OPT_INT:
 352                         ret = setsockopt(fd,socket_options[i].level,
 353                                         socket_options[i].option,
 354                                         (char *)&value,sizeof(int));
 355                         break;
 356
 357                 case OPT_ON:
 358                         if (got_value)
 359                                 DEBUG(0,("syntax error - %s "
 360                                         "does not take a value\n",tok));
 361
 362                         {
 363                                 int on = socket_options[i].value;
 364                                 ret = setsockopt(fd,socket_options[i].level,
 365                                         socket_options[i].option,
 366                                         (char *)&on,sizeof(int));
 367                         }
 368                         break;
 369                 }
 370
 371                 if (ret != 0) {
 372                         /* be aware that some systems like Solaris return
 373                          * EINVAL to a setsockopt() call when the client
 374                          * sent a RST previously - no need to worry */
 375                         DEBUG(2,("Failed to set socket option %s (Error %s)\n",
 376                                 tok, strerror(errno) ));
 377                 }
 378         }
 379
 380         TALLOC_FREE(ctx);
 381         print_socket_options(fd);
 382 }
 383
 384 /****************************************************************************
 385  Read from a socket.
 386 ****************************************************************************/
 387
 388 ssize_t read_udp_v4_socket(int fd,
 389                         char *buf,
 390                         size_t len,
 391                         struct sockaddr_storage *psa)
 392 {
 393         ssize_t ret;
 394         socklen_t socklen = sizeof(*psa);
 395         struct sockaddr_in *si = (struct sockaddr_in *)psa;
 396
 397         memset((char *)psa,'\0',socklen);
 398
 399         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
 400                         (struct sockaddr *)psa,&socklen);
 401         if (ret <= 0) {
 402                 /* Don't print a low debug error for a non-blocking socket. */
 403                 if (errno == EAGAIN) {
 404                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
 405                 } else {
 406                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
 407                                 strerror(errno)));
 408                 }
 409                 return 0;
 410         }
 411
 412         if (psa->ss_family != AF_INET) {
 413                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
 414                         "(not IPv4)\n", (int)psa->ss_family));
 415                 return 0;
 416         }
 417
 418         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
 419                         inet_ntoa(si->sin_addr),
 420                         si->sin_port,
 421                         (unsigned long)ret));
 422
 423         return ret;
 424 }
 425
 426 /****************************************************************************
 427  Read data from a file descriptor with a timout in msec.
 428  mincount = if timeout, minimum to read before returning
 429  maxcount = number to be read.
 430  time_out = timeout in milliseconds
 431  NB. This can be called with a non-socket fd, don't change
 432  sys_read() to sys_recv() or other socket call.
 433 ****************************************************************************/
 434
 435 NTSTATUS read_fd_with_timeout(int fd, char *buf,
 436                                   size_t mincnt, size_t maxcnt,
 437                                   unsigned int time_out,
 438                                   size_t *size_ret)
 439 {
 440         fd_set fds;
 441         int selrtn;
 442         ssize_t readret;
 443         size_t nread = 0;
 444         struct timeval timeout;
 445         char addr[INET6_ADDRSTRLEN];
 446         int save_errno;
 447
 448         /* just checking .... */
 449         if (maxcnt <= 0)
 450                 return NT_STATUS_OK;
 451
 452         /* Blocking read */
 453         if (time_out == 0) {
 454                 if (mincnt == 0) {
 455                         mincnt = maxcnt;
 456                 }
 457
 458                 while (nread < mincnt) {
 459                         readret = sys_read(fd, buf + nread, maxcnt - nread);
 460
 461                         if (readret == 0) {
 462                                 DEBUG(5,("read_fd_with_timeout: "
 463                                         "blocking read. EOF from client.\n"));
 464                                 return NT_STATUS_END_OF_FILE;
 465                         }
 466
 467                         if (readret == -1) {
 468                                 save_errno = errno;
 469                                 if (fd == smbd_server_fd()) {
 470                                         /* Try and give an error message
 471                                          * saying what client failed. */
 472                                         DEBUG(0,("read_fd_with_timeout: "
 473                                                 "client %s read error = %s.\n",
 474                                                 get_peer_addr(fd,addr,sizeof(addr)),
 475                                                 strerror(save_errno) ));
 476                                 } else {
 477                                         DEBUG(0,("read_fd_with_timeout: "
 478                                                 "read error = %s.\n",
 479                                                 strerror(save_errno) ));
 480                                 }
 481                                 return map_nt_error_from_unix(save_errno);
 482                         }
 483                         nread += readret;
 484                 }
 485                 goto done;
 486         }
 487
 488         /* Most difficult - timeout read */
 489         /* If this is ever called on a disk file and
 490            mincnt is greater then the filesize then
 491            system performance will suffer severely as
 492            select always returns true on disk files */
 493
 494         /* Set initial timeout */
 495         timeout.tv_sec = (time_t)(time_out / 1000);
 496         timeout.tv_usec = (long)(1000 * (time_out % 1000));
 497
 498         for (nread=0; nread < mincnt; ) {
 499                 FD_ZERO(&fds);
 500                 FD_SET(fd,&fds);
 501
 502                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
 503
 504                 /* Check if error */
 505                 if (selrtn == -1) {
 506                         save_errno = errno;
 507                         /* something is wrong. Maybe the socket is dead? */
 508                         if (fd == smbd_server_fd()) {
 509                                 /* Try and give an error message saying
 510                                  * what client failed. */
 511                                 DEBUG(0,("read_fd_with_timeout: timeout "
 512                                 "read for client %s. select error = %s.\n",
 513                                 get_peer_addr(fd,addr,sizeof(addr)),
 514                                 strerror(save_errno) ));
 515                         } else {
 516                                 DEBUG(0,("read_fd_with_timeout: timeout "
 517                                 "read. select error = %s.\n",
 518                                 strerror(save_errno) ));
 519                         }
 520                         return map_nt_error_from_unix(save_errno);
 521                 }
 522
 523                 /* Did we timeout ? */
 524                 if (selrtn == 0) {
 525                         DEBUG(10,("read_fd_with_timeout: timeout read. "
 526                                 "select timed out.\n"));
 527                         return NT_STATUS_IO_TIMEOUT;
 528                 }
 529
 530                 readret = sys_read(fd, buf+nread, maxcnt-nread);
 531
 532                 if (readret == 0) {
 533                         /* we got EOF on the file descriptor */
 534                         DEBUG(5,("read_fd_with_timeout: timeout read. "
 535                                 "EOF from client.\n"));
 536                         return NT_STATUS_END_OF_FILE;
 537                 }
 538
 539                 if (readret == -1) {
 540                         save_errno = errno;
 541                         /* the descriptor is probably dead */
 542                         if (fd == smbd_server_fd()) {
 543                                 /* Try and give an error message
 544                                  * saying what client failed. */
 545                                 DEBUG(0,("read_fd_with_timeout: timeout "
 546                                         "read to client %s. read error = %s.\n",
 547                                         get_peer_addr(fd,addr,sizeof(addr)),
 548                                         strerror(save_errno) ));
 549                         } else {
 550                                 DEBUG(0,("read_fd_with_timeout: timeout "
 551                                         "read. read error = %s.\n",
 552                                         strerror(save_errno) ));
 553                         }
 554                         return map_nt_error_from_unix(errno);
 555                 }
 556
 557                 nread += readret;
 558         }
 559
 560  done:
 561         /* Return the number we got */
 562         if (size_ret) {
 563                 *size_ret = nread;
 564         }
 565         return NT_STATUS_OK;
 566 }
 567
 568 /****************************************************************************
 569  Read data from an fd, reading exactly N bytes.
 570  NB. This can be called with a non-socket fd, don't add dependencies
 571  on socket calls.
 572 ****************************************************************************/
 573
 574 NTSTATUS read_data(int fd, char *buffer, size_t N)
 575 {
 576         return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
 577 }
 578
 579 /****************************************************************************
 580  Write all data from an iov array
 581  NB. This can be called with a non-socket fd, don't add dependencies
 582  on socket calls.
 583 ****************************************************************************/
 584
 585 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
 586 {
 587         int i;
 588         size_t to_send;
 589         ssize_t thistime;
 590         size_t sent;
 591         struct iovec *iov_copy, *iov;
 592
 593         to_send = 0;
 594         for (i=0; i<iovcnt; i++) {
 595                 to_send += orig_iov[i].iov_len;
 596         }
 597
 598         thistime = sys_writev(fd, orig_iov, iovcnt);
 599         if ((thistime <= 0) || (thistime == to_send)) {
 600                 return thistime;
 601         }
 602         sent = thistime;
 603
 604         /*
 605          * We could not send everything in one call. Make a copy of iov that
 606          * we can mess with. We keep a copy of the array start in iov_copy for
 607          * the TALLOC_FREE, because we're going to modify iov later on,
 608          * discarding elements.
 609          */
 610
 611         iov_copy = (struct iovec *)TALLOC_MEMDUP(
 612                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
 613
 614         if (iov_copy == NULL) {
 615                 errno = ENOMEM;
 616                 return -1;
 617         }
 618         iov = iov_copy;
 619
 620         while (sent < to_send) {
 621                 /*
 622                  * We have to discard "thistime" bytes from the beginning
 623                  * iov array, "thistime" contains the number of bytes sent
 624                  * via writev last.
 625                  */
 626                 while (thistime > 0) {
 627                         if (thistime < iov[0].iov_len) {
 628                                 char *new_base =
 629                                         (char *)iov[0].iov_base + thistime;
 630                                 iov[0].iov_base = (void *)new_base;
 631                                 iov[0].iov_len -= thistime;
 632                                 break;
 633                         }
 634                         thistime -= iov[0].iov_len;
 635                         iov += 1;
 636                         iovcnt -= 1;
 637                 }
 638
 639                 thistime = sys_writev(fd, iov, iovcnt);
 640                 if (thistime <= 0) {
 641                         break;
 642                 }
 643                 sent += thistime;
 644         }
 645
 646         TALLOC_FREE(iov_copy);
 647         return sent;
 648 }
 649
 650 /****************************************************************************
 651  Write data to a fd.
 652  NB. This can be called with a non-socket fd, don't add dependencies
 653  on socket calls.
 654 ****************************************************************************/
 655
 656 ssize_t write_data(int fd, const char *buffer, size_t N)
 657 {
 658         struct iovec iov;
 659
 660         iov.iov_base = CONST_DISCARD(void *, buffer);
 661         iov.iov_len = N;
 662         return write_data_iov(fd, &iov, 1);
 663 }
 664
 665 /****************************************************************************
 666  Send a keepalive packet (rfc1002).
 667 ****************************************************************************/
 668
 669 bool send_keepalive(int client)
 670 {
 671         unsigned char buf[4];
 672
 673         buf[0] = SMBkeepalive;
 674         buf[1] = buf[2] = buf[3] = 0;
 675
 676         return(write_data(client,(char *)buf,4) == 4);
 677 }
 678
 679 /****************************************************************************
 680  Read 4 bytes of a smb packet and return the smb length of the packet.
 681  Store the result in the buffer.
 682  This version of the function will return a length of zero on receiving
 683  a keepalive packet.
 684  Timeout is in milliseconds.
 685 ****************************************************************************/
 686
 687 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 688                                           unsigned int timeout,
 689                                           size_t *len)
 690 {
 691         int msg_type;
 692         NTSTATUS status;
 693
 694         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 695
 696         if (!NT_STATUS_IS_OK(status)) {
 697                 return status;
 698         }
 699
 700         *len = smb_len(inbuf);
 701         msg_type = CVAL(inbuf,0);
 702
 703         if (msg_type == SMBkeepalive) {
 704                 DEBUG(5,("Got keepalive packet\n"));
 705         }
 706
 707         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 708
 709         return NT_STATUS_OK;
 710 }
 711
 712 /****************************************************************************
 713  Read 4 bytes of a smb packet and return the smb length of the packet.
 714  Store the result in the buffer. This version of the function will
 715  never return a session keepalive (length of zero).
 716  Timeout is in milliseconds.
 717 ****************************************************************************/
 718
 719 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
 720                          size_t *len)
 721 {
 722         uint8_t msgtype = SMBkeepalive;
 723
 724         while (msgtype == SMBkeepalive) {
 725                 NTSTATUS status;
 726
 727                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
 728                                                           len);
 729                 if (!NT_STATUS_IS_OK(status)) {
 730                         return status;
 731                 }
 732
 733                 msgtype = CVAL(inbuf, 0);
 734         }
 735
 736         DEBUG(10,("read_smb_length: got smb length of %lu\n",
 737                   (unsigned long)len));
 738
 739         return NT_STATUS_OK;
 740 }
 741
 742 /****************************************************************************
 743  Read an smb from a fd.
 744  The timeout is in milliseconds.
 745  This function will return on receipt of a session keepalive packet.
 746  maxlen is the max number of bytes to return, not including the 4 byte
 747  length. If zero it means buflen limit.
 748  Doesn't check the MAC on signed packets.
 749 ****************************************************************************/
 750
 751 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 752                          size_t maxlen, size_t *p_len)
 753 {
 754         size_t len;
 755         NTSTATUS status;
 756
 757         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 758
 759         if (!NT_STATUS_IS_OK(status)) {
 760                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
 761                 return status;
 762         }
 763
 764         if (len > buflen) {
 765                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 766                                         (unsigned long)len));
 767                 return NT_STATUS_INVALID_PARAMETER;
 768         }
 769
 770         if(len > 0) {
 771                 if (maxlen) {
 772                         len = MIN(len,maxlen);
 773                 }
 774
 775                 status = read_fd_with_timeout(
 776                         fd, buffer+4, len, len, timeout, &len);
 777
 778                 if (!NT_STATUS_IS_OK(status)) {
 779                         return status;
 780                 }
 781
 782                 /* not all of samba3 properly checks for packet-termination
 783                  * of strings. This ensures that we don't run off into
 784                  * empty space. */
 785                 SSVAL(buffer+4,len, 0);
 786         }
 787
 788         *p_len = len;
 789         return NT_STATUS_OK;
 790 }
 791
 792 /****************************************************************************
 793  Open a socket of the specified type, port, and address for incoming data.
 794 ****************************************************************************/
 795
 796 int open_socket_in(int type,
 797                 uint16_t port,
 798                 int dlevel,
 799                 const struct sockaddr_storage *psock,
 800                 bool rebind)
 801 {
 802         struct sockaddr_storage sock;
 803         int res;
 804         socklen_t slen = sizeof(struct sockaddr_in);
 805
 806         sock = *psock;
 807
 808 #if defined(HAVE_IPV6)
 809         if (sock.ss_family == AF_INET6) {
 810                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 811                 slen = sizeof(struct sockaddr_in6);
 812         }
 813 #endif
 814         if (sock.ss_family == AF_INET) {
 815                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 816         }
 817
 818         res = socket(sock.ss_family, type, 0 );
 819         if( res == -1 ) {
 820                 if( DEBUGLVL(0) ) {
 821                         dbgtext( "open_socket_in(): socket() call failed: " );
 822                         dbgtext( "%s\n", strerror( errno ) );
 823                 }
 824                 return -1;
 825         }
 826
 827         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 828         {
 829                 int val = rebind ? 1 : 0;
 830                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 831                                         (char *)&val,sizeof(val)) == -1 ) {
 832                         if( DEBUGLVL( dlevel ) ) {
 833                                 dbgtext( "open_socket_in(): setsockopt: " );
 834                                 dbgtext( "SO_REUSEADDR = %s ",
 835                                                 val?"true":"false" );
 836                                 dbgtext( "on port %d failed ", port );
 837                                 dbgtext( "with error = %s\n", strerror(errno) );
 838                         }
 839                 }
 840 #ifdef SO_REUSEPORT
 841                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 842                                         (char *)&val,sizeof(val)) == -1 ) {
 843                         if( DEBUGLVL( dlevel ) ) {
 844                                 dbgtext( "open_socket_in(): setsockopt: ");
 845                                 dbgtext( "SO_REUSEPORT = %s ",
 846                                                 val?"true":"false");
 847                                 dbgtext( "on port %d failed ", port);
 848                                 dbgtext( "with error = %s\n", strerror(errno));
 849                         }
 850                 }
 851 #endif /* SO_REUSEPORT */
 852         }
 853
 854         /* now we've got a socket - we need to bind it */
 855         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 856                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 857                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 858                         char addr[INET6_ADDRSTRLEN];
 859                         print_sockaddr(addr, sizeof(addr),
 860                                         &sock);
 861                         dbgtext( "bind failed on port %d ", port);
 862                         dbgtext( "socket_addr = %s.\n", addr);
 863                         dbgtext( "Error = %s\n", strerror(errno));
 864                 }
 865                 close(res);
 866                 return -1;
 867         }
 868
 869         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 870         return( res );
 871  }
 872
 873 struct open_socket_out_state {
 874         int fd;
 875         struct event_context *ev;
 876         struct sockaddr_storage ss;
 877         socklen_t salen;
 878         uint16_t port;
 879         int wait_nsec;
 880 };
 881
 882 static void open_socket_out_connected(struct tevent_req *subreq);
 883
 884 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 885 {
 886         if (s->fd != -1) {
 887                 close(s->fd);
 888         }
 889         return 0;
 890 }
 891
 892 /****************************************************************************
 893  Create an outgoing socket. timeout is in milliseconds.
 894 **************************************************************************/
 895
 896 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 897                                         struct event_context *ev,
 898                                         const struct sockaddr_storage *pss,
 899                                         uint16_t port,
 900                                         int timeout)
 901 {
 902         char addr[INET6_ADDRSTRLEN];
 903         struct tevent_req *result, *subreq;
 904         struct open_socket_out_state *state;
 905         NTSTATUS status;
 906
 907         result = tevent_req_create(mem_ctx, &state,
 908                                    struct open_socket_out_state);
 909         if (result == NULL) {
 910                 return NULL;
 911         }
 912         state->ev = ev;
 913         state->ss = *pss;
 914         state->port = port;
 915         state->wait_nsec = 10000;
 916         state->salen = -1;
 917
 918         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 919         if (state->fd == -1) {
 920                 status = map_nt_error_from_unix(errno);
 921                 goto post_status;
 922         }
 923         talloc_set_destructor(state, open_socket_out_state_destructor);
 924
 925         if (!tevent_req_set_endtime(
 926                     result, ev, timeval_current_ofs(0, timeout*1000))) {
 927                 goto fail;
 928         }
 929
 930 #if defined(HAVE_IPV6)
 931         if (pss->ss_family == AF_INET6) {
 932                 struct sockaddr_in6 *psa6;
 933                 psa6 = (struct sockaddr_in6 *)&state->ss;
 934                 psa6->sin6_port = htons(port);
 935                 if (psa6->sin6_scope_id == 0
 936                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 937                         setup_linklocal_scope_id(
 938                                 (struct sockaddr *)&(state->ss));
 939                 }
 940                 state->salen = sizeof(struct sockaddr_in6);
 941         }
 942 #endif
 943         if (pss->ss_family == AF_INET) {
 944                 struct sockaddr_in *psa;
 945                 psa = (struct sockaddr_in *)&state->ss;
 946                 psa->sin_port = htons(port);
 947                 state->salen = sizeof(struct sockaddr_in);
 948         }
 949
 950         if (pss->ss_family == AF_UNIX) {
 951                 state->salen = sizeof(struct sockaddr_un);
 952         }
 953
 954         print_sockaddr(addr, sizeof(addr), &state->ss);
 955         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 956
 957         subreq = async_connect_send(state, state->ev, state->fd,
 958                                     (struct sockaddr *)&state->ss,
 959                                     state->salen);
 960         if ((subreq == NULL)
 961             || !tevent_req_set_endtime(
 962                     subreq, state->ev,
 963                     timeval_current_ofs(0, state->wait_nsec))) {
 964                 goto fail;
 965         }
 966         tevent_req_set_callback(subreq, open_socket_out_connected, result);
 967         return result;
 968
 969  post_status:
 970         tevent_req_nterror(result, status);
 971         return tevent_req_post(result, ev);
 972  fail:
 973         TALLOC_FREE(result);
 974         return NULL;
 975 }
 976
 977 static void open_socket_out_connected(struct tevent_req *subreq)
 978 {
 979         struct tevent_req *req =
 980                 tevent_req_callback_data(subreq, struct tevent_req);
 981         struct open_socket_out_state *state =
 982                 tevent_req_data(req, struct open_socket_out_state);
 983         int ret;
 984         int sys_errno;
 985
 986         ret = async_connect_recv(subreq, &sys_errno);
 987         TALLOC_FREE(subreq);
 988         if (ret == 0) {
 989                 tevent_req_done(req);
 990                 return;
 991         }
 992
 993         if (
 994 #ifdef ETIMEDOUT
 995                 (sys_errno == ETIMEDOUT) ||
 996 #endif
 997                 (sys_errno == EINPROGRESS) ||
 998                 (sys_errno == EALREADY) ||
 999                 (sys_errno == EAGAIN)) {
1000
1001                 /*
1002                  * retry
1003                  */
1004
1005                 if (state->wait_nsec < 250000) {
1006                         state->wait_nsec *= 1.5;
1007                 }
1008
1009                 subreq = async_connect_send(state, state->ev, state->fd,
1010                                             (struct sockaddr *)&state->ss,
1011                                             state->salen);
1012                 if (tevent_req_nomem(subreq, req)) {
1013                         return;
1014                 }
1015                 if (!tevent_req_set_endtime(
1016                             subreq, state->ev,
1017                             timeval_current_ofs(0, state->wait_nsec))) {
1018                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1019                         return;
1020                 }
1021                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1022                 return;
1023         }
1024
1025 #ifdef EISCONN
1026         if (sys_errno == EISCONN) {
1027                 tevent_req_done(req);
1028                 return;
1029         }
1030 #endif
1031
1032         /* real error */
1033         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1034 }
1035
1036 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1037 {
1038         struct open_socket_out_state *state =
1039                 tevent_req_data(req, struct open_socket_out_state);
1040         NTSTATUS status;
1041
1042         if (tevent_req_is_nterror(req, &status)) {
1043                 return status;
1044         }
1045         *pfd = state->fd;
1046         state->fd = -1;
1047         return NT_STATUS_OK;
1048 }
1049
1050 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1051                          int timeout, int *pfd)
1052 {
1053         TALLOC_CTX *frame = talloc_stackframe();
1054         struct event_context *ev;
1055         struct tevent_req *req;
1056         NTSTATUS status = NT_STATUS_NO_MEMORY;
1057
1058         ev = event_context_init(frame);
1059         if (ev == NULL) {
1060                 goto fail;
1061         }
1062
1063         req = open_socket_out_send(frame, ev, pss, port, timeout);
1064         if (req == NULL) {
1065                 goto fail;
1066         }
1067         if (!tevent_req_poll(req, ev)) {
1068                 status = NT_STATUS_INTERNAL_ERROR;
1069                 goto fail;
1070         }
1071         status = open_socket_out_recv(req, pfd);
1072  fail:
1073         TALLOC_FREE(frame);
1074         return status;
1075 }
1076
1077 struct open_socket_out_defer_state {
1078         struct event_context *ev;
1079         struct sockaddr_storage ss;
1080         uint16_t port;
1081         int timeout;
1082         int fd;
1083 };
1084
1085 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1086 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1087
1088 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1089                                               struct event_context *ev,
1090                                               struct timeval wait_time,
1091                                               const struct sockaddr_storage *pss,
1092                                               uint16_t port,
1093                                               int timeout)
1094 {
1095         struct tevent_req *req, *subreq;
1096         struct open_socket_out_defer_state *state;
1097
1098         req = tevent_req_create(mem_ctx, &state,
1099                                 struct open_socket_out_defer_state);
1100         if (req == NULL) {
1101                 return NULL;
1102         }
1103         state->ev = ev;
1104         state->ss = *pss;
1105         state->port = port;
1106         state->timeout = timeout;
1107
1108         subreq = tevent_wakeup_send(
1109                 state, ev,
1110                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1111         if (subreq == NULL) {
1112                 goto fail;
1113         }
1114         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1115         return req;
1116  fail:
1117         TALLOC_FREE(req);
1118         return NULL;
1119 }
1120
1121 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1122 {
1123         struct tevent_req *req = tevent_req_callback_data(
1124                 subreq, struct tevent_req);
1125         struct open_socket_out_defer_state *state = tevent_req_data(
1126                 req, struct open_socket_out_defer_state);
1127         bool ret;
1128
1129         ret = tevent_wakeup_recv(subreq);
1130         TALLOC_FREE(subreq);
1131         if (!ret) {
1132                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1133                 return;
1134         }
1135
1136         subreq = open_socket_out_send(state, state->ev, &state->ss,
1137                                       state->port, state->timeout);
1138         if (tevent_req_nomem(subreq, req)) {
1139                 return;
1140         }
1141         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1142 }
1143
1144 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1145 {
1146         struct tevent_req *req = tevent_req_callback_data(
1147                 subreq, struct tevent_req);
1148         struct open_socket_out_defer_state *state = tevent_req_data(
1149                 req, struct open_socket_out_defer_state);
1150         NTSTATUS status;
1151
1152         status = open_socket_out_recv(subreq, &state->fd);
1153         TALLOC_FREE(subreq);
1154         if (!NT_STATUS_IS_OK(status)) {
1155                 tevent_req_nterror(req, status);
1156                 return;
1157         }
1158         tevent_req_done(req);
1159 }
1160
1161 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1162 {
1163         struct open_socket_out_defer_state *state = tevent_req_data(
1164                 req, struct open_socket_out_defer_state);
1165         NTSTATUS status;
1166
1167         if (tevent_req_is_nterror(req, &status)) {
1168                 return status;
1169         }
1170         *pfd = state->fd;
1171         state->fd = -1;
1172         return NT_STATUS_OK;
1173 }
1174
1175 /*******************************************************************
1176  Create an outgoing TCP socket to the first addr that connects.
1177
1178  This is for simultaneous connection attempts to port 445 and 139 of a host
1179  or for simultatneous connection attempts to multiple DCs at once.  We return
1180  a socket fd of the first successful connection.
1181
1182  @param[in] addrs list of Internet addresses and ports to connect to
1183  @param[in] num_addrs number of address/port pairs in the addrs list
1184  @param[in] timeout time after which we stop waiting for a socket connection
1185             to succeed, given in milliseconds
1186  @param[out] fd_index the entry in addrs which we successfully connected to
1187  @param[out] fd fd of the open and connected socket
1188  @return true on a successful connection, false if all connection attempts
1189          failed or we timed out
1190 *******************************************************************/
1191
1192 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1193                          int timeout, int *fd_index, int *fd)
1194 {
1195         int i, resulting_index, res;
1196         int *sockets;
1197         bool good_connect;
1198
1199         fd_set r_fds, wr_fds;
1200         struct timeval tv;
1201         int maxfd;
1202
1203         int connect_loop = 10000; /* 10 milliseconds */
1204
1205         timeout *= 1000;        /* convert to microseconds */
1206
1207         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1208
1209         if (sockets == NULL)
1210                 return false;
1211
1212         resulting_index = -1;
1213
1214         for (i=0; i<num_addrs; i++)
1215                 sockets[i] = -1;
1216
1217         for (i=0; i<num_addrs; i++) {
1218                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1219                 if (sockets[i] < 0)
1220                         goto done;
1221                 set_blocking(sockets[i], false);
1222         }
1223
1224  connect_again:
1225         good_connect = false;
1226
1227         for (i=0; i<num_addrs; i++) {
1228                 const struct sockaddr * a =
1229                     (const struct sockaddr *)&(addrs[i]);
1230
1231                 if (sockets[i] == -1)
1232                         continue;
1233
1234                 if (sys_connect(sockets[i], a) == 0) {
1235                         /* Rather unlikely as we are non-blocking, but it
1236                          * might actually happen. */
1237                         resulting_index = i;
1238                         goto done;
1239                 }
1240
1241                 if (errno == EINPROGRESS || errno == EALREADY ||
1242 #ifdef EISCONN
1243                         errno == EISCONN ||
1244 #endif
1245                     errno == EAGAIN || errno == EINTR) {
1246                         /* These are the error messages that something is
1247                            progressing. */
1248                         good_connect = true;
1249                 } else if (errno != 0) {
1250                         /* There was a direct error */
1251                         close(sockets[i]);
1252                         sockets[i] = -1;
1253                 }
1254         }
1255
1256         if (!good_connect) {
1257                 /* All of the connect's resulted in real error conditions */
1258                 goto done;
1259         }
1260
1261         /* Lets see if any of the connect attempts succeeded */
1262
1263         maxfd = 0;
1264         FD_ZERO(&wr_fds);
1265         FD_ZERO(&r_fds);
1266
1267         for (i=0; i<num_addrs; i++) {
1268                 if (sockets[i] == -1)
1269                         continue;
1270                 FD_SET(sockets[i], &wr_fds);
1271                 FD_SET(sockets[i], &r_fds);
1272                 if (sockets[i]>maxfd)
1273                         maxfd = sockets[i];
1274         }
1275
1276         tv.tv_sec = 0;
1277         tv.tv_usec = connect_loop;
1278
1279         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1280
1281         if (res < 0)
1282                 goto done;
1283
1284         if (res == 0)
1285                 goto next_round;
1286
1287         for (i=0; i<num_addrs; i++) {
1288
1289                 if (sockets[i] == -1)
1290                         continue;
1291
1292                 /* Stevens, Network Programming says that if there's a
1293                  * successful connect, the socket is only writable. Upon an
1294                  * error, it's both readable and writable. */
1295
1296                 if (FD_ISSET(sockets[i], &r_fds) &&
1297                     FD_ISSET(sockets[i], &wr_fds)) {
1298                         /* readable and writable, so it's an error */
1299                         close(sockets[i]);
1300                         sockets[i] = -1;
1301                         continue;
1302                 }
1303
1304                 if (!FD_ISSET(sockets[i], &r_fds) &&
1305                     FD_ISSET(sockets[i], &wr_fds)) {
1306                         /* Only writable, so it's connected */
1307                         resulting_index = i;
1308                         goto done;
1309                 }
1310         }
1311
1312  next_round:
1313
1314         timeout -= connect_loop;
1315         if (timeout <= 0)
1316                 goto done;
1317         connect_loop *= 1.5;
1318         if (connect_loop > timeout)
1319                 connect_loop = timeout;
1320         goto connect_again;
1321
1322  done:
1323         for (i=0; i<num_addrs; i++) {
1324                 if (i == resulting_index)
1325                         continue;
1326                 if (sockets[i] >= 0)
1327                         close(sockets[i]);
1328         }
1329
1330         if (resulting_index >= 0) {
1331                 *fd_index = resulting_index;
1332                 *fd = sockets[*fd_index];
1333                 set_blocking(*fd, true);
1334         }
1335
1336         free(sockets);
1337
1338         return (resulting_index >= 0);
1339 }
1340 /****************************************************************************
1341  Open a connected UDP socket to host on port
1342 **************************************************************************/
1343
1344 int open_udp_socket(const char *host, int port)
1345 {
1346         struct sockaddr_storage ss;
1347         int res;
1348
1349         if (!interpret_string_addr(&ss, host, 0)) {
1350                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1351                         host));
1352                 return -1;
1353         }
1354
1355         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1356         if (res == -1) {
1357                 return -1;
1358         }
1359
1360 #if defined(HAVE_IPV6)
1361         if (ss.ss_family == AF_INET6) {
1362                 struct sockaddr_in6 *psa6;
1363                 psa6 = (struct sockaddr_in6 *)&ss;
1364                 psa6->sin6_port = htons(port);
1365                 if (psa6->sin6_scope_id == 0
1366                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1367                         setup_linklocal_scope_id(
1368                                 (struct sockaddr *)&ss);
1369                 }
1370         }
1371 #endif
1372         if (ss.ss_family == AF_INET) {
1373                 struct sockaddr_in *psa;
1374                 psa = (struct sockaddr_in *)&ss;
1375                 psa->sin_port = htons(port);
1376         }
1377
1378         if (sys_connect(res,(struct sockaddr *)&ss)) {
1379                 close(res);
1380                 return -1;
1381         }
1382
1383         return res;
1384 }
1385
1386 /*******************************************************************
1387  Return the IP addr of the remote end of a socket as a string.
1388  Optionally return the struct sockaddr_storage.
1389  ******************************************************************/
1390
1391 static const char *get_peer_addr_internal(int fd,
1392                                 char *addr_buf,
1393                                 size_t addr_buf_len,
1394                                 struct sockaddr *pss,
1395                                 socklen_t *plength)
1396 {
1397         struct sockaddr_storage ss;
1398         socklen_t length = sizeof(ss);
1399
1400         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1401
1402         if (fd == -1) {
1403                 return addr_buf;
1404         }
1405
1406         if (pss == NULL) {
1407                 pss = (struct sockaddr *)&ss;
1408                 plength = &length;
1409         }
1410
1411         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1412                 int level = (errno == ENOTCONN) ? 2 : 0;
1413                 DEBUG(level, ("getpeername failed. Error was %s\n",
1414                                strerror(errno)));
1415                 return addr_buf;
1416         }
1417
1418         print_sockaddr_len(addr_buf,
1419                         addr_buf_len,
1420                         pss,
1421                         *plength);
1422         return addr_buf;
1423 }
1424
1425 /*******************************************************************
1426  Matchname - determine if host name matches IP address. Used to
1427  confirm a hostname lookup to prevent spoof attacks.
1428 ******************************************************************/
1429
1430 static bool matchname(const char *remotehost,
1431                 const struct sockaddr *pss,
1432                 socklen_t len)
1433 {
1434         struct addrinfo *res = NULL;
1435         struct addrinfo *ailist = NULL;
1436         char addr_buf[INET6_ADDRSTRLEN];
1437         bool ret = interpret_string_addr_internal(&ailist,
1438                         remotehost,
1439                         AI_ADDRCONFIG|AI_CANONNAME);
1440
1441         if (!ret || ailist == NULL) {
1442                 DEBUG(3,("matchname: getaddrinfo failed for "
1443                         "name %s [%s]\n",
1444                         remotehost,
1445                         gai_strerror(ret) ));
1446                 return false;
1447         }
1448
1449         /*
1450          * Make sure that getaddrinfo() returns the "correct" host name.
1451          */
1452
1453         if (ailist->ai_canonname == NULL ||
1454                 (!strequal(remotehost, ailist->ai_canonname) &&
1455                  !strequal(remotehost, "localhost"))) {
1456                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1457                          remotehost,
1458                          ailist->ai_canonname ?
1459                                  ailist->ai_canonname : "(NULL)"));
1460                 freeaddrinfo(ailist);
1461                 return false;
1462         }
1463
1464         /* Look up the host address in the address list we just got. */
1465         for (res = ailist; res; res = res->ai_next) {
1466                 if (!res->ai_addr) {
1467                         continue;
1468                 }
1469                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1470                                         (struct sockaddr *)pss)) {
1471                         freeaddrinfo(ailist);
1472                         return true;
1473                 }
1474         }
1475
1476         /*
1477          * The host name does not map to the original host address. Perhaps
1478          * someone has compromised a name server. More likely someone botched
1479          * it, but that could be dangerous, too.
1480          */
1481
1482         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1483                 print_sockaddr_len(addr_buf,
1484                         sizeof(addr_buf),
1485                         pss,
1486                         len),
1487                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1488
1489         if (ailist) {
1490                 freeaddrinfo(ailist);
1491         }
1492         return false;
1493 }
1494
1495 /*******************************************************************
1496  Deal with the singleton cache.
1497 ******************************************************************/
1498
1499 struct name_addr_pair {
1500         struct sockaddr_storage ss;
1501         const char *name;
1502 };
1503
1504 /*******************************************************************
1505  Lookup a name/addr pair. Returns memory allocated from memcache.
1506 ******************************************************************/
1507
1508 static bool lookup_nc(struct name_addr_pair *nc)
1509 {
1510         DATA_BLOB tmp;
1511
1512         ZERO_STRUCTP(nc);
1513
1514         if (!memcache_lookup(
1515                         NULL, SINGLETON_CACHE,
1516                         data_blob_string_const_null("get_peer_name"),
1517                         &tmp)) {
1518                 return false;
1519         }
1520
1521         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1522         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1523         return true;
1524 }
1525
1526 /*******************************************************************
1527  Save a name/addr pair.
1528 ******************************************************************/
1529
1530 static void store_nc(const struct name_addr_pair *nc)
1531 {
1532         DATA_BLOB tmp;
1533         size_t namelen = strlen(nc->name);
1534
1535         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1536         if (!tmp.data) {
1537                 return;
1538         }
1539         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1540         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1541
1542         memcache_add(NULL, SINGLETON_CACHE,
1543                         data_blob_string_const_null("get_peer_name"),
1544                         tmp);
1545         data_blob_free(&tmp);
1546 }
1547
1548 /*******************************************************************
1549  Return the DNS name of the remote end of a socket.
1550 ******************************************************************/
1551
1552 const char *get_peer_name(int fd, bool force_lookup)
1553 {
1554         struct name_addr_pair nc;
1555         char addr_buf[INET6_ADDRSTRLEN];
1556         struct sockaddr_storage ss;
1557         socklen_t length = sizeof(ss);
1558         const char *p;
1559         int ret;
1560         char name_buf[MAX_DNS_NAME_LENGTH];
1561         char tmp_name[MAX_DNS_NAME_LENGTH];
1562
1563         /* reverse lookups can be *very* expensive, and in many
1564            situations won't work because many networks don't link dhcp
1565            with dns. To avoid the delay we avoid the lookup if
1566            possible */
1567         if (!lp_hostname_lookups() && (force_lookup == false)) {
1568                 length = sizeof(nc.ss);
1569                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1570                         (struct sockaddr *)&nc.ss, &length);
1571                 store_nc(&nc);
1572                 lookup_nc(&nc);
1573                 return nc.name ? nc.name : "UNKNOWN";
1574         }
1575
1576         lookup_nc(&nc);
1577
1578         memset(&ss, '\0', sizeof(ss));
1579         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1580
1581         /* it might be the same as the last one - save some DNS work */
1582         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1583                 return nc.name ? nc.name : "UNKNOWN";
1584         }
1585
1586         /* Not the same. We need to lookup. */
1587         if (fd == -1) {
1588                 return "UNKNOWN";
1589         }
1590
1591         /* Look up the remote host name. */
1592         ret = sys_getnameinfo((struct sockaddr *)&ss,
1593                         length,
1594                         name_buf,
1595                         sizeof(name_buf),
1596                         NULL,
1597                         0,
1598                         0);
1599
1600         if (ret) {
1601                 DEBUG(1,("get_peer_name: getnameinfo failed "
1602                         "for %s with error %s\n",
1603                         p,
1604                         gai_strerror(ret)));
1605                 strlcpy(name_buf, p, sizeof(name_buf));
1606         } else {
1607                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1608                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1609                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1610                 }
1611         }
1612
1613         /* can't pass the same source and dest strings in when you
1614            use --enable-developer or the clobber_region() call will
1615            get you */
1616
1617         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1618         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1619         if (strstr(name_buf,"..")) {
1620                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1621         }
1622
1623         nc.name = name_buf;
1624         nc.ss = ss;
1625
1626         store_nc(&nc);
1627         lookup_nc(&nc);
1628         return nc.name ? nc.name : "UNKNOWN";
1629 }
1630
1631 /*******************************************************************
1632  Return the IP addr of the remote end of a socket as a string.
1633  ******************************************************************/
1634
1635 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1636 {
1637         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1638 }
1639
1640 /*******************************************************************
1641  Create protected unix domain socket.
1642
1643  Some unixes cannot set permissions on a ux-dom-sock, so we
1644  have to make sure that the directory contains the protection
1645  permissions instead.
1646  ******************************************************************/
1647
1648 int create_pipe_sock(const char *socket_dir,
1649                      const char *socket_name,
1650                      mode_t dir_perms)
1651 {
1652 #ifdef HAVE_UNIXSOCKET
1653         struct sockaddr_un sunaddr;
1654         struct stat st;
1655         int sock;
1656         mode_t old_umask;
1657         char *path = NULL;
1658
1659         old_umask = umask(0);
1660
1661         /* Create the socket directory or reuse the existing one */
1662
1663         if (lstat(socket_dir, &st) == -1) {
1664                 if (errno == ENOENT) {
1665                         /* Create directory */
1666                         if (mkdir(socket_dir, dir_perms) == -1) {
1667                                 DEBUG(0, ("error creating socket directory "
1668                                         "%s: %s\n", socket_dir,
1669                                         strerror(errno)));
1670                                 goto out_umask;
1671                         }
1672                 } else {
1673                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1674                                 socket_dir, strerror(errno)));
1675                         goto out_umask;
1676                 }
1677         } else {
1678                 /* Check ownership and permission on existing directory */
1679                 if (!S_ISDIR(st.st_mode)) {
1680                         DEBUG(0, ("socket directory %s isn't a directory\n",
1681                                 socket_dir));
1682                         goto out_umask;
1683                 }
1684                 if ((st.st_uid != sec_initial_uid()) ||
1685                                 ((st.st_mode & 0777) != dir_perms)) {
1686                         DEBUG(0, ("invalid permissions on socket directory "
1687                                 "%s\n", socket_dir));
1688                         goto out_umask;
1689                 }
1690         }
1691
1692         /* Create the socket file */
1693
1694         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1695
1696         if (sock == -1) {
1697                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1698                         strerror(errno) ));
1699                 goto out_close;
1700         }
1701
1702         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1703                 goto out_close;
1704         }
1705
1706         unlink(path);
1707         memset(&sunaddr, 0, sizeof(sunaddr));
1708         sunaddr.sun_family = AF_UNIX;
1709         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1710
1711         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1712                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1713                         strerror(errno)));
1714                 goto out_close;
1715         }
1716
1717         if (listen(sock, 5) == -1) {
1718                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1719                         strerror(errno)));
1720                 goto out_close;
1721         }
1722
1723         SAFE_FREE(path);
1724
1725         umask(old_umask);
1726         return sock;
1727
1728 out_close:
1729         SAFE_FREE(path);
1730         if (sock != -1)
1731                 close(sock);
1732
1733 out_umask:
1734         umask(old_umask);
1735         return -1;
1736
1737 #else
1738         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1739         return -1;
1740 #endif /* HAVE_UNIXSOCKET */
1741 }
1742
1743 /****************************************************************************
1744  Get my own canonical name, including domain.
1745 ****************************************************************************/
1746
1747 const char *get_mydnsfullname(void)
1748 {
1749         struct addrinfo *res = NULL;
1750         char my_hostname[HOST_NAME_MAX];
1751         bool ret;
1752         DATA_BLOB tmp;
1753
1754         if (memcache_lookup(NULL, SINGLETON_CACHE,
1755                         data_blob_string_const_null("get_mydnsfullname"),
1756                         &tmp)) {
1757                 SMB_ASSERT(tmp.length > 0);
1758                 return (const char *)tmp.data;
1759         }
1760
1761         /* get my host name */
1762         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1763                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1764                 return NULL;
1765         }
1766
1767         /* Ensure null termination. */
1768         my_hostname[sizeof(my_hostname)-1] = '\0';
1769
1770         ret = interpret_string_addr_internal(&res,
1771                                 my_hostname,
1772                                 AI_ADDRCONFIG|AI_CANONNAME);
1773
1774         if (!ret || res == NULL) {
1775                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1776                         "name %s [%s]\n",
1777                         my_hostname,
1778                         gai_strerror(ret) ));
1779                 return NULL;
1780         }
1781
1782         /*
1783          * Make sure that getaddrinfo() returns the "correct" host name.
1784          */
1785
1786         if (res->ai_canonname == NULL) {
1787                 DEBUG(3,("get_mydnsfullname: failed to get "
1788                         "canonical name for %s\n",
1789                         my_hostname));
1790                 freeaddrinfo(res);
1791                 return NULL;
1792         }
1793
1794         /* This copies the data, so we must do a lookup
1795          * afterwards to find the value to return.
1796          */
1797
1798         memcache_add(NULL, SINGLETON_CACHE,
1799                         data_blob_string_const_null("get_mydnsfullname"),
1800                         data_blob_string_const_null(res->ai_canonname));
1801
1802         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1803                         data_blob_string_const_null("get_mydnsfullname"),
1804                         &tmp)) {
1805                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1806                                 strlen(res->ai_canonname) + 1);
1807         }
1808
1809         freeaddrinfo(res);
1810
1811         return (const char *)tmp.data;
1812 }
1813
1814 /************************************************************
1815  Is this my name ?
1816 ************************************************************/
1817
1818 bool is_myname_or_ipaddr(const char *s)
1819 {
1820         TALLOC_CTX *ctx = talloc_tos();
1821         char addr[INET6_ADDRSTRLEN];
1822         char *name = NULL;
1823         const char *dnsname;
1824         char *servername = NULL;
1825
1826         if (!s) {
1827                 return false;
1828         }
1829
1830         /* Santize the string from '\\name' */
1831         name = talloc_strdup(ctx, s);
1832         if (!name) {
1833                 return false;
1834         }
1835
1836         servername = strrchr_m(name, '\\' );
1837         if (!servername) {
1838                 servername = name;
1839         } else {
1840                 servername++;
1841         }
1842
1843         /* Optimize for the common case */
1844         if (strequal(servername, global_myname())) {
1845                 return true;
1846         }
1847
1848         /* Check for an alias */
1849         if (is_myname(servername)) {
1850                 return true;
1851         }
1852
1853         /* Check for loopback */
1854         if (strequal(servername, "127.0.0.1") ||
1855                         strequal(servername, "::1")) {
1856                 return true;
1857         }
1858
1859         if (strequal(servername, "localhost")) {
1860                 return true;
1861         }
1862
1863         /* Maybe it's my dns name */
1864         dnsname = get_mydnsfullname();
1865         if (dnsname && strequal(servername, dnsname)) {
1866                 return true;
1867         }
1868
1869         /* Handle possible CNAME records - convert to an IP addr. */
1870         if (!is_ipaddress(servername)) {
1871                 /* Use DNS to resolve the name, but only the first address */
1872                 struct sockaddr_storage ss;
1873                 if (interpret_string_addr(&ss, servername, 0)) {
1874                         print_sockaddr(addr,
1875                                         sizeof(addr),
1876                                         &ss);
1877                         servername = addr;
1878                 }
1879         }
1880
1881         /* Maybe its an IP address? */
1882         if (is_ipaddress(servername)) {
1883                 struct sockaddr_storage ss;
1884                 struct iface_struct *nics;
1885                 int i, n;
1886
1887                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1888                         return false;
1889                 }
1890
1891                 if (ismyaddr((struct sockaddr *)&ss)) {
1892                         return true;
1893                 }
1894
1895                 if (is_zero_addr((struct sockaddr *)&ss) ||
1896                         is_loopback_addr((struct sockaddr *)&ss)) {
1897                         return false;
1898                 }
1899
1900                 n = get_interfaces(talloc_tos(), &nics);
1901                 for (i=0; i<n; i++) {
1902                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1903                                 TALLOC_FREE(nics);
1904                                 return true;
1905                         }
1906                 }
1907                 TALLOC_FREE(nics);
1908         }
1909
1910         /* No match */
1911         return false;
1912 }
1913
1914 struct getaddrinfo_state {
1915         const char *node;
1916         const char *service;
1917         const struct addrinfo *hints;
1918         struct addrinfo *res;
1919         int ret;
1920 };
1921
1922 static void getaddrinfo_do(void *private_data);
1923 static void getaddrinfo_done(struct tevent_req *subreq);
1924
1925 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1926                                     struct tevent_context *ev,
1927                                     struct fncall_context *ctx,
1928                                     const char *node,
1929                                     const char *service,
1930                                     const struct addrinfo *hints)
1931 {
1932         struct tevent_req *req, *subreq;
1933         struct getaddrinfo_state *state;
1934
1935         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1936         if (req == NULL) {
1937                 return NULL;
1938         }
1939
1940         state->node = node;
1941         state->service = service;
1942         state->hints = hints;
1943
1944         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1945         if (tevent_req_nomem(subreq, req)) {
1946                 return tevent_req_post(req, ev);
1947         }
1948         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1949         return req;
1950 }
1951
1952 static void getaddrinfo_do(void *private_data)
1953 {
1954         struct getaddrinfo_state *state =
1955                 (struct getaddrinfo_state *)private_data;
1956
1957         state->ret = getaddrinfo(state->node, state->service, state->hints,
1958                                  &state->res);
1959 }
1960
1961 static void getaddrinfo_done(struct tevent_req *subreq)
1962 {
1963         struct tevent_req *req = tevent_req_callback_data(
1964                 subreq, struct tevent_req);
1965         int ret, err;
1966
1967         ret = fncall_recv(subreq, &err);
1968         TALLOC_FREE(subreq);
1969         if (ret == -1) {
1970                 tevent_req_error(req, err);
1971                 return;
1972         }
1973         tevent_req_done(req);
1974 }
1975
1976 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1977 {
1978         struct getaddrinfo_state *state = tevent_req_data(
1979                 req, struct getaddrinfo_state);
1980         int err;
1981
1982         if (tevent_req_is_unix_error(req, &err)) {
1983                 switch(err) {
1984                 case ENOMEM:
1985                         return EAI_MEMORY;
1986                 default:
1987                         return EAI_FAIL;
1988                 }
1989         }
1990         if (state->ret == 0) {
1991                 *res = state->res;
1992         }
1993         return state->ret;
1994 }