source3/lib/util_sock.c

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