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 == get_client_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 == get_client_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 == get_client_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         ssize_t ret;
 659         struct iovec iov;
 660
 661         iov.iov_base = CONST_DISCARD(void *, buffer);
 662         iov.iov_len = N;
 663
 664         ret = write_data_iov(fd, &iov, 1);
 665         if (ret >= 0) {
 666                 return ret;
 667         }
 668
 669         if (fd == get_client_fd()) {
 670                 char addr[INET6_ADDRSTRLEN];
 671                 /*
 672                  * Try and give an error message saying what client failed.
 673                  */
 674                 DEBUG(0, ("write_data: write failure in writing to client %s. "
 675                           "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
 676                           strerror(errno)));
 677         } else {
 678                 DEBUG(0,("write_data: write failure. Error = %s\n",
 679                          strerror(errno) ));
 680         }
 681
 682         return -1;
 683 }
 684
 685 /****************************************************************************
 686  Send a keepalive packet (rfc1002).
 687 ****************************************************************************/
 688
 689 bool send_keepalive(int client)
 690 {
 691         unsigned char buf[4];
 692
 693         buf[0] = SMBkeepalive;
 694         buf[1] = buf[2] = buf[3] = 0;
 695
 696         return(write_data(client,(char *)buf,4) == 4);
 697 }
 698
 699 /****************************************************************************
 700  Read 4 bytes of a smb packet and return the smb length of the packet.
 701  Store the result in the buffer.
 702  This version of the function will return a length of zero on receiving
 703  a keepalive packet.
 704  Timeout is in milliseconds.
 705 ****************************************************************************/
 706
 707 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
 708                                           unsigned int timeout,
 709                                           size_t *len)
 710 {
 711         int msg_type;
 712         NTSTATUS status;
 713
 714         status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
 715
 716         if (!NT_STATUS_IS_OK(status)) {
 717                 return status;
 718         }
 719
 720         *len = smb_len(inbuf);
 721         msg_type = CVAL(inbuf,0);
 722
 723         if (msg_type == SMBkeepalive) {
 724                 DEBUG(5,("Got keepalive packet\n"));
 725         }
 726
 727         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
 728
 729         return NT_STATUS_OK;
 730 }
 731
 732 /****************************************************************************
 733  Read 4 bytes of a smb packet and return the smb length of the packet.
 734  Store the result in the buffer. This version of the function will
 735  never return a session keepalive (length of zero).
 736  Timeout is in milliseconds.
 737 ****************************************************************************/
 738
 739 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
 740                          size_t *len)
 741 {
 742         uint8_t msgtype = SMBkeepalive;
 743
 744         while (msgtype == SMBkeepalive) {
 745                 NTSTATUS status;
 746
 747                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
 748                                                           len);
 749                 if (!NT_STATUS_IS_OK(status)) {
 750                         return status;
 751                 }
 752
 753                 msgtype = CVAL(inbuf, 0);
 754         }
 755
 756         DEBUG(10,("read_smb_length: got smb length of %lu\n",
 757                   (unsigned long)len));
 758
 759         return NT_STATUS_OK;
 760 }
 761
 762 /****************************************************************************
 763  Read an smb from a fd.
 764  The timeout is in milliseconds.
 765  This function will return on receipt of a session keepalive packet.
 766  maxlen is the max number of bytes to return, not including the 4 byte
 767  length. If zero it means buflen limit.
 768  Doesn't check the MAC on signed packets.
 769 ****************************************************************************/
 770
 771 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
 772                          size_t maxlen, size_t *p_len)
 773 {
 774         size_t len;
 775         NTSTATUS status;
 776
 777         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
 778
 779         if (!NT_STATUS_IS_OK(status)) {
 780                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
 781                 return status;
 782         }
 783
 784         if (len > buflen) {
 785                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 786                                         (unsigned long)len));
 787                 return NT_STATUS_INVALID_PARAMETER;
 788         }
 789
 790         if(len > 0) {
 791                 if (maxlen) {
 792                         len = MIN(len,maxlen);
 793                 }
 794
 795                 status = read_fd_with_timeout(
 796                         fd, buffer+4, len, len, timeout, &len);
 797
 798                 if (!NT_STATUS_IS_OK(status)) {
 799                         return status;
 800                 }
 801
 802                 /* not all of samba3 properly checks for packet-termination
 803                  * of strings. This ensures that we don't run off into
 804                  * empty space. */
 805                 SSVAL(buffer+4,len, 0);
 806         }
 807
 808         *p_len = len;
 809         return NT_STATUS_OK;
 810 }
 811
 812 /****************************************************************************
 813  Open a socket of the specified type, port, and address for incoming data.
 814 ****************************************************************************/
 815
 816 int open_socket_in(int type,
 817                 uint16_t port,
 818                 int dlevel,
 819                 const struct sockaddr_storage *psock,
 820                 bool rebind)
 821 {
 822         struct sockaddr_storage sock;
 823         int res;
 824         socklen_t slen = sizeof(struct sockaddr_in);
 825
 826         sock = *psock;
 827
 828 #if defined(HAVE_IPV6)
 829         if (sock.ss_family == AF_INET6) {
 830                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
 831                 slen = sizeof(struct sockaddr_in6);
 832         }
 833 #endif
 834         if (sock.ss_family == AF_INET) {
 835                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
 836         }
 837
 838         res = socket(sock.ss_family, type, 0 );
 839         if( res == -1 ) {
 840                 if( DEBUGLVL(0) ) {
 841                         dbgtext( "open_socket_in(): socket() call failed: " );
 842                         dbgtext( "%s\n", strerror( errno ) );
 843                 }
 844                 return -1;
 845         }
 846
 847         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
 848         {
 849                 int val = rebind ? 1 : 0;
 850                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
 851                                         (char *)&val,sizeof(val)) == -1 ) {
 852                         if( DEBUGLVL( dlevel ) ) {
 853                                 dbgtext( "open_socket_in(): setsockopt: " );
 854                                 dbgtext( "SO_REUSEADDR = %s ",
 855                                                 val?"true":"false" );
 856                                 dbgtext( "on port %d failed ", port );
 857                                 dbgtext( "with error = %s\n", strerror(errno) );
 858                         }
 859                 }
 860 #ifdef SO_REUSEPORT
 861                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
 862                                         (char *)&val,sizeof(val)) == -1 ) {
 863                         if( DEBUGLVL( dlevel ) ) {
 864                                 dbgtext( "open_socket_in(): setsockopt: ");
 865                                 dbgtext( "SO_REUSEPORT = %s ",
 866                                                 val?"true":"false");
 867                                 dbgtext( "on port %d failed ", port);
 868                                 dbgtext( "with error = %s\n", strerror(errno));
 869                         }
 870                 }
 871 #endif /* SO_REUSEPORT */
 872         }
 873
 874         /* now we've got a socket - we need to bind it */
 875         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
 876                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
 877                                 port == SMB_PORT2 || port == NMB_PORT) ) {
 878                         char addr[INET6_ADDRSTRLEN];
 879                         print_sockaddr(addr, sizeof(addr),
 880                                         &sock);
 881                         dbgtext( "bind failed on port %d ", port);
 882                         dbgtext( "socket_addr = %s.\n", addr);
 883                         dbgtext( "Error = %s\n", strerror(errno));
 884                 }
 885                 close(res);
 886                 return -1;
 887         }
 888
 889         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
 890         return( res );
 891  }
 892
 893 struct open_socket_out_state {
 894         int fd;
 895         struct event_context *ev;
 896         struct sockaddr_storage ss;
 897         socklen_t salen;
 898         uint16_t port;
 899         int wait_nsec;
 900 };
 901
 902 static void open_socket_out_connected(struct tevent_req *subreq);
 903
 904 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
 905 {
 906         if (s->fd != -1) {
 907                 close(s->fd);
 908         }
 909         return 0;
 910 }
 911
 912 /****************************************************************************
 913  Create an outgoing socket. timeout is in milliseconds.
 914 **************************************************************************/
 915
 916 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 917                                         struct event_context *ev,
 918                                         const struct sockaddr_storage *pss,
 919                                         uint16_t port,
 920                                         int timeout)
 921 {
 922         char addr[INET6_ADDRSTRLEN];
 923         struct tevent_req *result, *subreq;
 924         struct open_socket_out_state *state;
 925         NTSTATUS status;
 926
 927         result = tevent_req_create(mem_ctx, &state,
 928                                    struct open_socket_out_state);
 929         if (result == NULL) {
 930                 return NULL;
 931         }
 932         state->ev = ev;
 933         state->ss = *pss;
 934         state->port = port;
 935         state->wait_nsec = 10000;
 936         state->salen = -1;
 937
 938         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
 939         if (state->fd == -1) {
 940                 status = map_nt_error_from_unix(errno);
 941                 goto post_status;
 942         }
 943         talloc_set_destructor(state, open_socket_out_state_destructor);
 944
 945         if (!tevent_req_set_endtime(
 946                     result, ev, timeval_current_ofs(0, timeout*1000))) {
 947                 goto fail;
 948         }
 949
 950 #if defined(HAVE_IPV6)
 951         if (pss->ss_family == AF_INET6) {
 952                 struct sockaddr_in6 *psa6;
 953                 psa6 = (struct sockaddr_in6 *)&state->ss;
 954                 psa6->sin6_port = htons(port);
 955                 if (psa6->sin6_scope_id == 0
 956                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
 957                         setup_linklocal_scope_id(
 958                                 (struct sockaddr *)&(state->ss));
 959                 }
 960                 state->salen = sizeof(struct sockaddr_in6);
 961         }
 962 #endif
 963         if (pss->ss_family == AF_INET) {
 964                 struct sockaddr_in *psa;
 965                 psa = (struct sockaddr_in *)&state->ss;
 966                 psa->sin_port = htons(port);
 967                 state->salen = sizeof(struct sockaddr_in);
 968         }
 969
 970         if (pss->ss_family == AF_UNIX) {
 971                 state->salen = sizeof(struct sockaddr_un);
 972         }
 973
 974         print_sockaddr(addr, sizeof(addr), &state->ss);
 975         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
 976
 977         subreq = async_connect_send(state, state->ev, state->fd,
 978                                     (struct sockaddr *)&state->ss,
 979                                     state->salen);
 980         if ((subreq == NULL)
 981             || !tevent_req_set_endtime(
 982                     subreq, state->ev,
 983                     timeval_current_ofs(0, state->wait_nsec))) {
 984                 goto fail;
 985         }
 986         tevent_req_set_callback(subreq, open_socket_out_connected, result);
 987         return result;
 988
 989  post_status:
 990         tevent_req_nterror(result, status);
 991         return tevent_req_post(result, ev);
 992  fail:
 993         TALLOC_FREE(result);
 994         return NULL;
 995 }
 996
 997 static void open_socket_out_connected(struct tevent_req *subreq)
 998 {
 999         struct tevent_req *req =
1000                 tevent_req_callback_data(subreq, struct tevent_req);
1001         struct open_socket_out_state *state =
1002                 tevent_req_data(req, struct open_socket_out_state);
1003         int ret;
1004         int sys_errno;
1005
1006         ret = async_connect_recv(subreq, &sys_errno);
1007         TALLOC_FREE(subreq);
1008         if (ret == 0) {
1009                 tevent_req_done(req);
1010                 return;
1011         }
1012
1013         if (
1014 #ifdef ETIMEDOUT
1015                 (sys_errno == ETIMEDOUT) ||
1016 #endif
1017                 (sys_errno == EINPROGRESS) ||
1018                 (sys_errno == EALREADY) ||
1019                 (sys_errno == EAGAIN)) {
1020
1021                 /*
1022                  * retry
1023                  */
1024
1025                 if (state->wait_nsec < 250000) {
1026                         state->wait_nsec *= 1.5;
1027                 }
1028
1029                 subreq = async_connect_send(state, state->ev, state->fd,
1030                                             (struct sockaddr *)&state->ss,
1031                                             state->salen);
1032                 if (tevent_req_nomem(subreq, req)) {
1033                         return;
1034                 }
1035                 if (!tevent_req_set_endtime(
1036                             subreq, state->ev,
1037                             timeval_current_ofs(0, state->wait_nsec))) {
1038                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1039                         return;
1040                 }
1041                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1042                 return;
1043         }
1044
1045 #ifdef EISCONN
1046         if (sys_errno == EISCONN) {
1047                 tevent_req_done(req);
1048                 return;
1049         }
1050 #endif
1051
1052         /* real error */
1053         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1054 }
1055
1056 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1057 {
1058         struct open_socket_out_state *state =
1059                 tevent_req_data(req, struct open_socket_out_state);
1060         NTSTATUS status;
1061
1062         if (tevent_req_is_nterror(req, &status)) {
1063                 return status;
1064         }
1065         *pfd = state->fd;
1066         state->fd = -1;
1067         return NT_STATUS_OK;
1068 }
1069
1070 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1071                          int timeout, int *pfd)
1072 {
1073         TALLOC_CTX *frame = talloc_stackframe();
1074         struct event_context *ev;
1075         struct tevent_req *req;
1076         NTSTATUS status = NT_STATUS_NO_MEMORY;
1077
1078         ev = event_context_init(frame);
1079         if (ev == NULL) {
1080                 goto fail;
1081         }
1082
1083         req = open_socket_out_send(frame, ev, pss, port, timeout);
1084         if (req == NULL) {
1085                 goto fail;
1086         }
1087         if (!tevent_req_poll(req, ev)) {
1088                 status = NT_STATUS_INTERNAL_ERROR;
1089                 goto fail;
1090         }
1091         status = open_socket_out_recv(req, pfd);
1092  fail:
1093         TALLOC_FREE(frame);
1094         return status;
1095 }
1096
1097 struct open_socket_out_defer_state {
1098         struct event_context *ev;
1099         struct sockaddr_storage ss;
1100         uint16_t port;
1101         int timeout;
1102         int fd;
1103 };
1104
1105 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1106 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1107
1108 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1109                                               struct event_context *ev,
1110                                               struct timeval wait_time,
1111                                               const struct sockaddr_storage *pss,
1112                                               uint16_t port,
1113                                               int timeout)
1114 {
1115         struct tevent_req *req, *subreq;
1116         struct open_socket_out_defer_state *state;
1117
1118         req = tevent_req_create(mem_ctx, &state,
1119                                 struct open_socket_out_defer_state);
1120         if (req == NULL) {
1121                 return NULL;
1122         }
1123         state->ev = ev;
1124         state->ss = *pss;
1125         state->port = port;
1126         state->timeout = timeout;
1127
1128         subreq = tevent_wakeup_send(
1129                 state, ev,
1130                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1131         if (subreq == NULL) {
1132                 goto fail;
1133         }
1134         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1135         return req;
1136  fail:
1137         TALLOC_FREE(req);
1138         return NULL;
1139 }
1140
1141 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1142 {
1143         struct tevent_req *req = tevent_req_callback_data(
1144                 subreq, struct tevent_req);
1145         struct open_socket_out_defer_state *state = tevent_req_data(
1146                 req, struct open_socket_out_defer_state);
1147         bool ret;
1148
1149         ret = tevent_wakeup_recv(subreq);
1150         TALLOC_FREE(subreq);
1151         if (!ret) {
1152                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1153                 return;
1154         }
1155
1156         subreq = open_socket_out_send(state, state->ev, &state->ss,
1157                                       state->port, state->timeout);
1158         if (tevent_req_nomem(subreq, req)) {
1159                 return;
1160         }
1161         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1162 }
1163
1164 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1165 {
1166         struct tevent_req *req = tevent_req_callback_data(
1167                 subreq, struct tevent_req);
1168         struct open_socket_out_defer_state *state = tevent_req_data(
1169                 req, struct open_socket_out_defer_state);
1170         NTSTATUS status;
1171
1172         status = open_socket_out_recv(subreq, &state->fd);
1173         TALLOC_FREE(subreq);
1174         if (!NT_STATUS_IS_OK(status)) {
1175                 tevent_req_nterror(req, status);
1176                 return;
1177         }
1178         tevent_req_done(req);
1179 }
1180
1181 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1182 {
1183         struct open_socket_out_defer_state *state = tevent_req_data(
1184                 req, struct open_socket_out_defer_state);
1185         NTSTATUS status;
1186
1187         if (tevent_req_is_nterror(req, &status)) {
1188                 return status;
1189         }
1190         *pfd = state->fd;
1191         state->fd = -1;
1192         return NT_STATUS_OK;
1193 }
1194
1195 /*******************************************************************
1196  Create an outgoing TCP socket to the first addr that connects.
1197
1198  This is for simultaneous connection attempts to port 445 and 139 of a host
1199  or for simultatneous connection attempts to multiple DCs at once.  We return
1200  a socket fd of the first successful connection.
1201
1202  @param[in] addrs list of Internet addresses and ports to connect to
1203  @param[in] num_addrs number of address/port pairs in the addrs list
1204  @param[in] timeout time after which we stop waiting for a socket connection
1205             to succeed, given in milliseconds
1206  @param[out] fd_index the entry in addrs which we successfully connected to
1207  @param[out] fd fd of the open and connected socket
1208  @return true on a successful connection, false if all connection attempts
1209          failed or we timed out
1210 *******************************************************************/
1211
1212 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1213                          int timeout, int *fd_index, int *fd)
1214 {
1215         int i, resulting_index, res;
1216         int *sockets;
1217         bool good_connect;
1218
1219         fd_set r_fds, wr_fds;
1220         struct timeval tv;
1221         int maxfd;
1222
1223         int connect_loop = 10000; /* 10 milliseconds */
1224
1225         timeout *= 1000;        /* convert to microseconds */
1226
1227         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1228
1229         if (sockets == NULL)
1230                 return false;
1231
1232         resulting_index = -1;
1233
1234         for (i=0; i<num_addrs; i++)
1235                 sockets[i] = -1;
1236
1237         for (i=0; i<num_addrs; i++) {
1238                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1239                 if (sockets[i] < 0)
1240                         goto done;
1241                 set_blocking(sockets[i], false);
1242         }
1243
1244  connect_again:
1245         good_connect = false;
1246
1247         for (i=0; i<num_addrs; i++) {
1248                 const struct sockaddr * a =
1249                     (const struct sockaddr *)&(addrs[i]);
1250
1251                 if (sockets[i] == -1)
1252                         continue;
1253
1254                 if (sys_connect(sockets[i], a) == 0) {
1255                         /* Rather unlikely as we are non-blocking, but it
1256                          * might actually happen. */
1257                         resulting_index = i;
1258                         goto done;
1259                 }
1260
1261                 if (errno == EINPROGRESS || errno == EALREADY ||
1262 #ifdef EISCONN
1263                         errno == EISCONN ||
1264 #endif
1265                     errno == EAGAIN || errno == EINTR) {
1266                         /* These are the error messages that something is
1267                            progressing. */
1268                         good_connect = true;
1269                 } else if (errno != 0) {
1270                         /* There was a direct error */
1271                         close(sockets[i]);
1272                         sockets[i] = -1;
1273                 }
1274         }
1275
1276         if (!good_connect) {
1277                 /* All of the connect's resulted in real error conditions */
1278                 goto done;
1279         }
1280
1281         /* Lets see if any of the connect attempts succeeded */
1282
1283         maxfd = 0;
1284         FD_ZERO(&wr_fds);
1285         FD_ZERO(&r_fds);
1286
1287         for (i=0; i<num_addrs; i++) {
1288                 if (sockets[i] == -1)
1289                         continue;
1290                 FD_SET(sockets[i], &wr_fds);
1291                 FD_SET(sockets[i], &r_fds);
1292                 if (sockets[i]>maxfd)
1293                         maxfd = sockets[i];
1294         }
1295
1296         tv.tv_sec = 0;
1297         tv.tv_usec = connect_loop;
1298
1299         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1300
1301         if (res < 0)
1302                 goto done;
1303
1304         if (res == 0)
1305                 goto next_round;
1306
1307         for (i=0; i<num_addrs; i++) {
1308
1309                 if (sockets[i] == -1)
1310                         continue;
1311
1312                 /* Stevens, Network Programming says that if there's a
1313                  * successful connect, the socket is only writable. Upon an
1314                  * error, it's both readable and writable. */
1315
1316                 if (FD_ISSET(sockets[i], &r_fds) &&
1317                     FD_ISSET(sockets[i], &wr_fds)) {
1318                         /* readable and writable, so it's an error */
1319                         close(sockets[i]);
1320                         sockets[i] = -1;
1321                         continue;
1322                 }
1323
1324                 if (!FD_ISSET(sockets[i], &r_fds) &&
1325                     FD_ISSET(sockets[i], &wr_fds)) {
1326                         /* Only writable, so it's connected */
1327                         resulting_index = i;
1328                         goto done;
1329                 }
1330         }
1331
1332  next_round:
1333
1334         timeout -= connect_loop;
1335         if (timeout <= 0)
1336                 goto done;
1337         connect_loop *= 1.5;
1338         if (connect_loop > timeout)
1339                 connect_loop = timeout;
1340         goto connect_again;
1341
1342  done:
1343         for (i=0; i<num_addrs; i++) {
1344                 if (i == resulting_index)
1345                         continue;
1346                 if (sockets[i] >= 0)
1347                         close(sockets[i]);
1348         }
1349
1350         if (resulting_index >= 0) {
1351                 *fd_index = resulting_index;
1352                 *fd = sockets[*fd_index];
1353                 set_blocking(*fd, true);
1354         }
1355
1356         free(sockets);
1357
1358         return (resulting_index >= 0);
1359 }
1360 /****************************************************************************
1361  Open a connected UDP socket to host on port
1362 **************************************************************************/
1363
1364 int open_udp_socket(const char *host, int port)
1365 {
1366         struct sockaddr_storage ss;
1367         int res;
1368
1369         if (!interpret_string_addr(&ss, host, 0)) {
1370                 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1371                         host));
1372                 return -1;
1373         }
1374
1375         res = socket(ss.ss_family, SOCK_DGRAM, 0);
1376         if (res == -1) {
1377                 return -1;
1378         }
1379
1380 #if defined(HAVE_IPV6)
1381         if (ss.ss_family == AF_INET6) {
1382                 struct sockaddr_in6 *psa6;
1383                 psa6 = (struct sockaddr_in6 *)&ss;
1384                 psa6->sin6_port = htons(port);
1385                 if (psa6->sin6_scope_id == 0
1386                                 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1387                         setup_linklocal_scope_id(
1388                                 (struct sockaddr *)&ss);
1389                 }
1390         }
1391 #endif
1392         if (ss.ss_family == AF_INET) {
1393                 struct sockaddr_in *psa;
1394                 psa = (struct sockaddr_in *)&ss;
1395                 psa->sin_port = htons(port);
1396         }
1397
1398         if (sys_connect(res,(struct sockaddr *)&ss)) {
1399                 close(res);
1400                 return -1;
1401         }
1402
1403         return res;
1404 }
1405
1406 /*******************************************************************
1407  Return the IP addr of the remote end of a socket as a string.
1408  Optionally return the struct sockaddr_storage.
1409  ******************************************************************/
1410
1411 static const char *get_peer_addr_internal(int fd,
1412                                 char *addr_buf,
1413                                 size_t addr_buf_len,
1414                                 struct sockaddr *pss,
1415                                 socklen_t *plength)
1416 {
1417         struct sockaddr_storage ss;
1418         socklen_t length = sizeof(ss);
1419
1420         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1421
1422         if (fd == -1) {
1423                 return addr_buf;
1424         }
1425
1426         if (pss == NULL) {
1427                 pss = (struct sockaddr *)&ss;
1428                 plength = &length;
1429         }
1430
1431         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1432                 int level = (errno == ENOTCONN) ? 2 : 0;
1433                 DEBUG(level, ("getpeername failed. Error was %s\n",
1434                                strerror(errno)));
1435                 return addr_buf;
1436         }
1437
1438         print_sockaddr_len(addr_buf,
1439                         addr_buf_len,
1440                         pss,
1441                         *plength);
1442         return addr_buf;
1443 }
1444
1445 /*******************************************************************
1446  Matchname - determine if host name matches IP address. Used to
1447  confirm a hostname lookup to prevent spoof attacks.
1448 ******************************************************************/
1449
1450 static bool matchname(const char *remotehost,
1451                 const struct sockaddr *pss,
1452                 socklen_t len)
1453 {
1454         struct addrinfo *res = NULL;
1455         struct addrinfo *ailist = NULL;
1456         char addr_buf[INET6_ADDRSTRLEN];
1457         bool ret = interpret_string_addr_internal(&ailist,
1458                         remotehost,
1459                         AI_ADDRCONFIG|AI_CANONNAME);
1460
1461         if (!ret || ailist == NULL) {
1462                 DEBUG(3,("matchname: getaddrinfo failed for "
1463                         "name %s [%s]\n",
1464                         remotehost,
1465                         gai_strerror(ret) ));
1466                 return false;
1467         }
1468
1469         /*
1470          * Make sure that getaddrinfo() returns the "correct" host name.
1471          */
1472
1473         if (ailist->ai_canonname == NULL ||
1474                 (!strequal(remotehost, ailist->ai_canonname) &&
1475                  !strequal(remotehost, "localhost"))) {
1476                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1477                          remotehost,
1478                          ailist->ai_canonname ?
1479                                  ailist->ai_canonname : "(NULL)"));
1480                 freeaddrinfo(ailist);
1481                 return false;
1482         }
1483
1484         /* Look up the host address in the address list we just got. */
1485         for (res = ailist; res; res = res->ai_next) {
1486                 if (!res->ai_addr) {
1487                         continue;
1488                 }
1489                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1490                                         (struct sockaddr *)pss)) {
1491                         freeaddrinfo(ailist);
1492                         return true;
1493                 }
1494         }
1495
1496         /*
1497          * The host name does not map to the original host address. Perhaps
1498          * someone has compromised a name server. More likely someone botched
1499          * it, but that could be dangerous, too.
1500          */
1501
1502         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1503                 print_sockaddr_len(addr_buf,
1504                         sizeof(addr_buf),
1505                         pss,
1506                         len),
1507                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1508
1509         if (ailist) {
1510                 freeaddrinfo(ailist);
1511         }
1512         return false;
1513 }
1514
1515 /*******************************************************************
1516  Deal with the singleton cache.
1517 ******************************************************************/
1518
1519 struct name_addr_pair {
1520         struct sockaddr_storage ss;
1521         const char *name;
1522 };
1523
1524 /*******************************************************************
1525  Lookup a name/addr pair. Returns memory allocated from memcache.
1526 ******************************************************************/
1527
1528 static bool lookup_nc(struct name_addr_pair *nc)
1529 {
1530         DATA_BLOB tmp;
1531
1532         ZERO_STRUCTP(nc);
1533
1534         if (!memcache_lookup(
1535                         NULL, SINGLETON_CACHE,
1536                         data_blob_string_const_null("get_peer_name"),
1537                         &tmp)) {
1538                 return false;
1539         }
1540
1541         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1542         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1543         return true;
1544 }
1545
1546 /*******************************************************************
1547  Save a name/addr pair.
1548 ******************************************************************/
1549
1550 static void store_nc(const struct name_addr_pair *nc)
1551 {
1552         DATA_BLOB tmp;
1553         size_t namelen = strlen(nc->name);
1554
1555         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1556         if (!tmp.data) {
1557                 return;
1558         }
1559         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1560         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1561
1562         memcache_add(NULL, SINGLETON_CACHE,
1563                         data_blob_string_const_null("get_peer_name"),
1564                         tmp);
1565         data_blob_free(&tmp);
1566 }
1567
1568 /*******************************************************************
1569  Return the DNS name of the remote end of a socket.
1570 ******************************************************************/
1571
1572 const char *get_peer_name(int fd, bool force_lookup)
1573 {
1574         struct name_addr_pair nc;
1575         char addr_buf[INET6_ADDRSTRLEN];
1576         struct sockaddr_storage ss;
1577         socklen_t length = sizeof(ss);
1578         const char *p;
1579         int ret;
1580         char name_buf[MAX_DNS_NAME_LENGTH];
1581         char tmp_name[MAX_DNS_NAME_LENGTH];
1582
1583         /* reverse lookups can be *very* expensive, and in many
1584            situations won't work because many networks don't link dhcp
1585            with dns. To avoid the delay we avoid the lookup if
1586            possible */
1587         if (!lp_hostname_lookups() && (force_lookup == false)) {
1588                 length = sizeof(nc.ss);
1589                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1590                         (struct sockaddr *)&nc.ss, &length);
1591                 store_nc(&nc);
1592                 lookup_nc(&nc);
1593                 return nc.name ? nc.name : "UNKNOWN";
1594         }
1595
1596         lookup_nc(&nc);
1597
1598         memset(&ss, '\0', sizeof(ss));
1599         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1600
1601         /* it might be the same as the last one - save some DNS work */
1602         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1603                 return nc.name ? nc.name : "UNKNOWN";
1604         }
1605
1606         /* Not the same. We need to lookup. */
1607         if (fd == -1) {
1608                 return "UNKNOWN";
1609         }
1610
1611         /* Look up the remote host name. */
1612         ret = sys_getnameinfo((struct sockaddr *)&ss,
1613                         length,
1614                         name_buf,
1615                         sizeof(name_buf),
1616                         NULL,
1617                         0,
1618                         0);
1619
1620         if (ret) {
1621                 DEBUG(1,("get_peer_name: getnameinfo failed "
1622                         "for %s with error %s\n",
1623                         p,
1624                         gai_strerror(ret)));
1625                 strlcpy(name_buf, p, sizeof(name_buf));
1626         } else {
1627                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1628                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1629                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1630                 }
1631         }
1632
1633         /* can't pass the same source and dest strings in when you
1634            use --enable-developer or the clobber_region() call will
1635            get you */
1636
1637         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1638         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1639         if (strstr(name_buf,"..")) {
1640                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1641         }
1642
1643         nc.name = name_buf;
1644         nc.ss = ss;
1645
1646         store_nc(&nc);
1647         lookup_nc(&nc);
1648         return nc.name ? nc.name : "UNKNOWN";
1649 }
1650
1651 /*******************************************************************
1652  Return the IP addr of the remote end of a socket as a string.
1653  ******************************************************************/
1654
1655 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1656 {
1657         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1658 }
1659
1660 /*******************************************************************
1661  Create protected unix domain socket.
1662
1663  Some unixes cannot set permissions on a ux-dom-sock, so we
1664  have to make sure that the directory contains the protection
1665  permissions instead.
1666  ******************************************************************/
1667
1668 int create_pipe_sock(const char *socket_dir,
1669                      const char *socket_name,
1670                      mode_t dir_perms)
1671 {
1672 #ifdef HAVE_UNIXSOCKET
1673         struct sockaddr_un sunaddr;
1674         struct stat st;
1675         int sock;
1676         mode_t old_umask;
1677         char *path = NULL;
1678
1679         old_umask = umask(0);
1680
1681         /* Create the socket directory or reuse the existing one */
1682
1683         if (lstat(socket_dir, &st) == -1) {
1684                 if (errno == ENOENT) {
1685                         /* Create directory */
1686                         if (mkdir(socket_dir, dir_perms) == -1) {
1687                                 DEBUG(0, ("error creating socket directory "
1688                                         "%s: %s\n", socket_dir,
1689                                         strerror(errno)));
1690                                 goto out_umask;
1691                         }
1692                 } else {
1693                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1694                                 socket_dir, strerror(errno)));
1695                         goto out_umask;
1696                 }
1697         } else {
1698                 /* Check ownership and permission on existing directory */
1699                 if (!S_ISDIR(st.st_mode)) {
1700                         DEBUG(0, ("socket directory %s isn't a directory\n",
1701                                 socket_dir));
1702                         goto out_umask;
1703                 }
1704                 if ((st.st_uid != sec_initial_uid()) ||
1705                                 ((st.st_mode & 0777) != dir_perms)) {
1706                         DEBUG(0, ("invalid permissions on socket directory "
1707                                 "%s\n", socket_dir));
1708                         goto out_umask;
1709                 }
1710         }
1711
1712         /* Create the socket file */
1713
1714         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1715
1716         if (sock == -1) {
1717                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1718                         strerror(errno) ));
1719                 goto out_close;
1720         }
1721
1722         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1723                 goto out_close;
1724         }
1725
1726         unlink(path);
1727         memset(&sunaddr, 0, sizeof(sunaddr));
1728         sunaddr.sun_family = AF_UNIX;
1729         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1730
1731         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1732                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1733                         strerror(errno)));
1734                 goto out_close;
1735         }
1736
1737         if (listen(sock, 5) == -1) {
1738                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1739                         strerror(errno)));
1740                 goto out_close;
1741         }
1742
1743         SAFE_FREE(path);
1744
1745         umask(old_umask);
1746         return sock;
1747
1748 out_close:
1749         SAFE_FREE(path);
1750         if (sock != -1)
1751                 close(sock);
1752
1753 out_umask:
1754         umask(old_umask);
1755         return -1;
1756
1757 #else
1758         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1759         return -1;
1760 #endif /* HAVE_UNIXSOCKET */
1761 }
1762
1763 /****************************************************************************
1764  Get my own canonical name, including domain.
1765 ****************************************************************************/
1766
1767 const char *get_mydnsfullname(void)
1768 {
1769         struct addrinfo *res = NULL;
1770         char my_hostname[HOST_NAME_MAX];
1771         bool ret;
1772         DATA_BLOB tmp;
1773
1774         if (memcache_lookup(NULL, SINGLETON_CACHE,
1775                         data_blob_string_const_null("get_mydnsfullname"),
1776                         &tmp)) {
1777                 SMB_ASSERT(tmp.length > 0);
1778                 return (const char *)tmp.data;
1779         }
1780
1781         /* get my host name */
1782         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1783                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1784                 return NULL;
1785         }
1786
1787         /* Ensure null termination. */
1788         my_hostname[sizeof(my_hostname)-1] = '\0';
1789
1790         ret = interpret_string_addr_internal(&res,
1791                                 my_hostname,
1792                                 AI_ADDRCONFIG|AI_CANONNAME);
1793
1794         if (!ret || res == NULL) {
1795                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1796                         "name %s [%s]\n",
1797                         my_hostname,
1798                         gai_strerror(ret) ));
1799                 return NULL;
1800         }
1801
1802         /*
1803          * Make sure that getaddrinfo() returns the "correct" host name.
1804          */
1805
1806         if (res->ai_canonname == NULL) {
1807                 DEBUG(3,("get_mydnsfullname: failed to get "
1808                         "canonical name for %s\n",
1809                         my_hostname));
1810                 freeaddrinfo(res);
1811                 return NULL;
1812         }
1813
1814         /* This copies the data, so we must do a lookup
1815          * afterwards to find the value to return.
1816          */
1817
1818         memcache_add(NULL, SINGLETON_CACHE,
1819                         data_blob_string_const_null("get_mydnsfullname"),
1820                         data_blob_string_const_null(res->ai_canonname));
1821
1822         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1823                         data_blob_string_const_null("get_mydnsfullname"),
1824                         &tmp)) {
1825                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1826                                 strlen(res->ai_canonname) + 1);
1827         }
1828
1829         freeaddrinfo(res);
1830
1831         return (const char *)tmp.data;
1832 }
1833
1834 /************************************************************
1835  Is this my name ?
1836 ************************************************************/
1837
1838 bool is_myname_or_ipaddr(const char *s)
1839 {
1840         TALLOC_CTX *ctx = talloc_tos();
1841         char addr[INET6_ADDRSTRLEN];
1842         char *name = NULL;
1843         const char *dnsname;
1844         char *servername = NULL;
1845
1846         if (!s) {
1847                 return false;
1848         }
1849
1850         /* Santize the string from '\\name' */
1851         name = talloc_strdup(ctx, s);
1852         if (!name) {
1853                 return false;
1854         }
1855
1856         servername = strrchr_m(name, '\\' );
1857         if (!servername) {
1858                 servername = name;
1859         } else {
1860                 servername++;
1861         }
1862
1863         /* Optimize for the common case */
1864         if (strequal(servername, global_myname())) {
1865                 return true;
1866         }
1867
1868         /* Check for an alias */
1869         if (is_myname(servername)) {
1870                 return true;
1871         }
1872
1873         /* Check for loopback */
1874         if (strequal(servername, "127.0.0.1") ||
1875                         strequal(servername, "::1")) {
1876                 return true;
1877         }
1878
1879         if (strequal(servername, "localhost")) {
1880                 return true;
1881         }
1882
1883         /* Maybe it's my dns name */
1884         dnsname = get_mydnsfullname();
1885         if (dnsname && strequal(servername, dnsname)) {
1886                 return true;
1887         }
1888
1889         /* Handle possible CNAME records - convert to an IP addr. */
1890         if (!is_ipaddress(servername)) {
1891                 /* Use DNS to resolve the name, but only the first address */
1892                 struct sockaddr_storage ss;
1893                 if (interpret_string_addr(&ss, servername, 0)) {
1894                         print_sockaddr(addr,
1895                                         sizeof(addr),
1896                                         &ss);
1897                         servername = addr;
1898                 }
1899         }
1900
1901         /* Maybe its an IP address? */
1902         if (is_ipaddress(servername)) {
1903                 struct sockaddr_storage ss;
1904                 struct iface_struct *nics;
1905                 int i, n;
1906
1907                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1908                         return false;
1909                 }
1910
1911                 if (ismyaddr((struct sockaddr *)&ss)) {
1912                         return true;
1913                 }
1914
1915                 if (is_zero_addr((struct sockaddr *)&ss) ||
1916                         is_loopback_addr((struct sockaddr *)&ss)) {
1917                         return false;
1918                 }
1919
1920                 n = get_interfaces(talloc_tos(), &nics);
1921                 for (i=0; i<n; i++) {
1922                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1923                                 TALLOC_FREE(nics);
1924                                 return true;
1925                         }
1926                 }
1927                 TALLOC_FREE(nics);
1928         }
1929
1930         /* No match */
1931         return false;
1932 }
1933
1934 struct getaddrinfo_state {
1935         const char *node;
1936         const char *service;
1937         const struct addrinfo *hints;
1938         struct addrinfo *res;
1939         int ret;
1940 };
1941
1942 static void getaddrinfo_do(void *private_data);
1943 static void getaddrinfo_done(struct tevent_req *subreq);
1944
1945 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1946                                     struct tevent_context *ev,
1947                                     struct fncall_context *ctx,
1948                                     const char *node,
1949                                     const char *service,
1950                                     const struct addrinfo *hints)
1951 {
1952         struct tevent_req *req, *subreq;
1953         struct getaddrinfo_state *state;
1954
1955         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1956         if (req == NULL) {
1957                 return NULL;
1958         }
1959
1960         state->node = node;
1961         state->service = service;
1962         state->hints = hints;
1963
1964         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1965         if (tevent_req_nomem(subreq, req)) {
1966                 return tevent_req_post(req, ev);
1967         }
1968         tevent_req_set_callback(subreq, getaddrinfo_done, req);
1969         return req;
1970 }
1971
1972 static void getaddrinfo_do(void *private_data)
1973 {
1974         struct getaddrinfo_state *state =
1975                 (struct getaddrinfo_state *)private_data;
1976
1977         state->ret = getaddrinfo(state->node, state->service, state->hints,
1978                                  &state->res);
1979 }
1980
1981 static void getaddrinfo_done(struct tevent_req *subreq)
1982 {
1983         struct tevent_req *req = tevent_req_callback_data(
1984                 subreq, struct tevent_req);
1985         int ret, err;
1986
1987         ret = fncall_recv(subreq, &err);
1988         TALLOC_FREE(subreq);
1989         if (ret == -1) {
1990                 tevent_req_error(req, err);
1991                 return;
1992         }
1993         tevent_req_done(req);
1994 }
1995
1996 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1997 {
1998         struct getaddrinfo_state *state = tevent_req_data(
1999                 req, struct getaddrinfo_state);
2000         int err;
2001
2002         if (tevent_req_is_unix_error(req, &err)) {
2003                 switch(err) {
2004                 case ENOMEM:
2005                         return EAI_MEMORY;
2006                 default:
2007                         return EAI_FAIL;
2008                 }
2009         }
2010         if (state->ret == 0) {
2011                 *res = state->res;
2012         }
2013         return state->ret;
2014 }