src/src/ip.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2015 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 /* Functions for doing things with sockets. With the advent of IPv6 this has
   9 got messier, so that it's worth pulling out the code into separate functions
  10 that other parts of Exim can call, expecially as there are now several
  11 different places in the code where sockets are used. */
  12
  13
  14 #include "exim.h"
  15
  16
  17 /*************************************************
  18 *             Create a socket                    *
  19 *************************************************/
  20
  21 /* Socket creation happens in a number of places so it's packaged here for
  22 convenience.
  23
  24 Arguments:
  25   type       SOCK_DGRAM or SOCK_STREAM
  26   af         AF_INET or AF_INET6
  27
  28 Returns:     socket number or -1 on failure
  29 */
  30
  31 int
  32 ip_socket(int type, int af)
  33 {
  34 int sock = socket(af, type, 0);
  35 if (sock < 0)
  36   log_write(0, LOG_MAIN, "IPv%c socket creation failed: %s",
  37     (af == AF_INET6)? '6':'4', strerror(errno));
  38 return sock;
  39 }
  40
  41
  42
  43
  44 #if HAVE_IPV6
  45 /*************************************************
  46 *      Convert printing address to numeric       *
  47 *************************************************/
  48
  49 /* This function converts the textual form of an IP address into a numeric form
  50 in an appropriate structure in an IPv6 environment. The getaddrinfo() function
  51 can (apparently) handle more complicated addresses (e.g. those containing
  52 scopes) than inet_pton() in some environments. We use hints to tell it that the
  53 input must be a numeric address.
  54
  55 However, apparently some operating systems (or libraries) don't support
  56 getaddrinfo(), so there is a build-time option to revert to inet_pton() (which
  57 does not support scopes).
  58
  59 Arguments:
  60   address     textual form of the address
  61   addr        where to copy back the answer
  62
  63 Returns:      nothing - failure provokes a panic-die
  64 */
  65
  66 static void
  67 ip_addrinfo(const uschar *address, struct sockaddr_in6 *saddr)
  68 {
  69 #ifdef IPV6_USE_INET_PTON
  70
  71   if (inet_pton(AF_INET6, CCS address, &saddr->sin6_addr) != 1)
  72     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to parse \"%s\" as an "
  73       "IP address", address);
  74   saddr->sin6_family = AF_INET6;
  75
  76 #else
  77
  78   int rc;
  79   struct addrinfo hints, *res;
  80   memset(&hints, 0, sizeof(hints));
  81   hints.ai_family = AF_INET6;
  82   hints.ai_socktype = SOCK_STREAM;
  83   hints.ai_flags = AI_NUMERICHOST;
  84   if ((rc = getaddrinfo(CCS address, NULL, &hints, &res)) != 0 || res == NULL)
  85     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to parse \"%s\" as an "
  86       "IP address: %s", address,
  87       (rc == 0)? "NULL result returned" : gai_strerror(rc));
  88   memcpy(saddr, res->ai_addr, res->ai_addrlen);
  89   freeaddrinfo(res);
  90
  91 #endif
  92 }
  93 #endif  /* HAVE_IPV6 */
  94
  95
  96 /*************************************************
  97 *         Bind socket to interface and port      *
  98 *************************************************/
  99
 100 int
 101 ip_addr(void * sin_, int af, const uschar * address, int port)
 102 {
 103 union sockaddr_46 * sin = sin_;
 104 memset(sin, 0, sizeof(*sin));
 105
 106 /* Setup code when using an IPv6 socket. The wildcard address is ":", to
 107 ensure an IPv6 socket is used. */
 108
 109 #if HAVE_IPV6
 110 if (af == AF_INET6)
 111   {
 112   if (address[0] == ':' && address[1] == 0)
 113     {
 114     sin->v6.sin6_family = AF_INET6;
 115     sin->v6.sin6_addr = in6addr_any;
 116     }
 117   else
 118     ip_addrinfo(address, &sin->v6);  /* Panic-dies on error */
 119   sin->v6.sin6_port = htons(port);
 120   return sizeof(sin->v6);
 121   }
 122 else
 123 #else     /* HAVE_IPv6 */
 124 af = af;  /* Avoid compiler warning */
 125 #endif    /* HAVE_IPV6 */
 126
 127 /* Setup code when using IPv4 socket. The wildcard address is "". */
 128
 129   {
 130   sin->v4.sin_family = AF_INET;
 131   sin->v4.sin_port = htons(port);
 132   sin->v4.sin_addr.s_addr = address[0] == 0
 133     ? (S_ADDR_TYPE)INADDR_ANY
 134     : (S_ADDR_TYPE)inet_addr(CS address);
 135   return sizeof(sin->v4);
 136   }
 137 }
 138
 139
 140
 141 /* This function binds a socket to a local interface address and port. For a
 142 wildcard IPv6 bind, the address is ":".
 143
 144 Arguments:
 145   sock           the socket
 146   af             AF_INET or AF_INET6 - the socket type
 147   address        the IP address, in text form
 148   port           the IP port (host order)
 149
 150 Returns:         the result of bind()
 151 */
 152
 153 int
 154 ip_bind(int sock, int af, uschar *address, int port)
 155 {
 156 union sockaddr_46 sin;
 157 int s_len = ip_addr(&sin, af, address, port);
 158 return bind(sock, (struct sockaddr *)&sin, s_len);
 159 }
 160
 161
 162
 163 /*************************************************
 164 *        Connect socket to remote host           *
 165 *************************************************/
 166
 167 /* This function connects a socket to a remote address and port. The socket may
 168 or may not have previously been bound to a local interface. The socket is not
 169 closed, even in cases of error. It is expected that the calling function, which
 170 created the socket, will be the one that closes it.
 171
 172 Arguments:
 173   sock        the socket
 174   af          AF_INET6 or AF_INET for the socket type
 175   address     the remote address, in text form
 176   port        the remote port
 177   timeout     a timeout (zero for indefinite timeout)
 178
 179 Returns:      0 on success; -1 on failure, with errno set
 180 */
 181
 182 int
 183 ip_connect(int sock, int af, const uschar *address, int port, int timeout)
 184 {
 185 struct sockaddr_in s_in4;
 186 struct sockaddr *s_ptr;
 187 int s_len, rc, save_errno;
 188
 189 /* For an IPv6 address, use an IPv6 sockaddr structure. */
 190
 191 #if HAVE_IPV6
 192 struct sockaddr_in6 s_in6;
 193 if (af == AF_INET6)
 194   {
 195   memset(&s_in6, 0, sizeof(s_in6));
 196   ip_addrinfo(address, &s_in6);   /* Panic-dies on error */
 197   s_in6.sin6_port = htons(port);
 198   s_ptr = (struct sockaddr *)&s_in6;
 199   s_len = sizeof(s_in6);
 200   }
 201 else
 202 #else     /* HAVE_IPV6 */
 203 af = af;  /* Avoid compiler warning */
 204 #endif    /* HAVE_IPV6 */
 205
 206 /* For an IPv4 address, use an IPv4 sockaddr structure, even on a system with
 207 IPv6 support. */
 208
 209   {
 210   memset(&s_in4, 0, sizeof(s_in4));
 211   s_in4.sin_family = AF_INET;
 212   s_in4.sin_port = htons(port);
 213   s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(CCS address);
 214   s_ptr = (struct sockaddr *)&s_in4;
 215   s_len = sizeof(s_in4);
 216   }
 217
 218 /* If no connection timeout is set, just call connect() without setting a
 219 timer, thereby allowing the inbuilt OS timeout to operate. */
 220
 221 callout_address = string_sprintf("[%s]:%d", address, port);
 222 sigalrm_seen = FALSE;
 223 if (timeout > 0) alarm(timeout);
 224 rc = connect(sock, s_ptr, s_len);
 225 save_errno = errno;
 226 alarm(0);
 227
 228 /* There is a testing facility for simulating a connection timeout, as I
 229 can't think of any other way of doing this. It converts a connection refused
 230 into a timeout if the timeout is set to 999999. */
 231
 232 if (running_in_test_harness  && save_errno == ECONNREFUSED && timeout == 999999)
 233   {
 234   rc = -1;
 235   save_errno = EINTR;
 236   sigalrm_seen = TRUE;
 237   }
 238
 239 /* Success */
 240
 241 if (rc >= 0)
 242   return 0;
 243
 244 /* A failure whose error code is "Interrupted system call" is in fact
 245 an externally applied timeout if the signal handler has been run. */
 246
 247 errno = save_errno == EINTR && sigalrm_seen ? ETIMEDOUT : save_errno;
 248 return -1;
 249 }
 250
 251
 252
 253 /*************************************************
 254 *    Create connected socket to remote host      *
 255 *************************************************/
 256
 257 /* Create a socket and connect to host (name or number, ipv6 ok)
 258    at one of port-range.
 259
 260 Arguments:
 261   type          SOCK_DGRAM or SOCK_STREAM
 262   af            AF_INET6 or AF_INET for the socket type
 263   address       the remote address, in text form
 264   portlo,porthi the remote port range
 265   timeout       a timeout
 266   connhost      if not NULL, host_item filled in with connection details
 267   errstr        pointer for allocated string on error
 268
 269 Return:
 270   socket fd, or -1 on failure (having allocated an error string)
 271 */
 272 int
 273 ip_connectedsocket(int type, const uschar * hostname, int portlo, int porthi,
 274         int timeout, host_item * connhost, uschar ** errstr)
 275 {
 276 int namelen, port;
 277 host_item shost;
 278 host_item *h;
 279 int af = 0, fd, fd4 = -1, fd6 = -1;
 280
 281 shost.next = NULL;
 282 shost.address = NULL;
 283 shost.port = portlo;
 284 shost.mx = -1;
 285
 286 namelen = Ustrlen(hostname);
 287
 288 /* Anything enclosed in [] must be an IP address. */
 289
 290 if (hostname[0] == '[' &&
 291     hostname[namelen - 1] == ']')
 292   {
 293   uschar * host = string_copyn(hostname+1, namelen-2);
 294   if (string_is_ip_address(host, NULL) == 0)
 295     {
 296     *errstr = string_sprintf("malformed IP address \"%s\"", hostname);
 297     return -1;
 298     }
 299   shost.name = shost.address = host;
 300   }
 301
 302 /* Otherwise check for an unadorned IP address */
 303
 304 else if (string_is_ip_address(hostname, NULL) != 0)
 305   shost.name = shost.address = string_copyn(hostname, namelen);
 306
 307 /* Otherwise lookup IP address(es) from the name */
 308
 309 else
 310   {
 311   shost.name = string_copyn(hostname, namelen);
 312   if (host_find_byname(&shost, NULL, HOST_FIND_QUALIFY_SINGLE,
 313       NULL, FALSE) != HOST_FOUND)
 314     {
 315     *errstr = string_sprintf("no IP address found for host %s", shost.name);
 316     return -1;
 317     }
 318   }
 319
 320 /* Try to connect to the server - test each IP till one works */
 321
 322 for (h = &shost; h != NULL; h = h->next)
 323   {
 324   fd = Ustrchr(h->address, ':') != 0
 325     ? fd6 < 0 ? (fd6 = ip_socket(type, af = AF_INET6)) : fd6
 326     : fd4 < 0 ? (fd4 = ip_socket(type, af = AF_INET )) : fd4;
 327
 328   if (fd < 0)
 329     {
 330     *errstr = string_sprintf("failed to create socket: %s", strerror(errno));
 331     goto bad;
 332     }
 333
 334   for(port = portlo; port <= porthi; port++)
 335     if (ip_connect(fd, af, h->address, port, timeout) == 0)
 336       {
 337       if (fd != fd6) close(fd6);
 338       if (fd != fd4) close(fd4);
 339       if (connhost)
 340         {
 341         h->port = port;
 342         *connhost = *h;
 343         connhost->next = NULL;
 344         }
 345       return fd;
 346       }
 347   }
 348
 349 *errstr = string_sprintf("failed to connect to any address for %s: %s",
 350   hostname, strerror(errno));
 351
 352 bad:
 353   close(fd4); close(fd6); return -1;
 354 }
 355
 356
 357 int
 358 ip_tcpsocket(const uschar * hostport, uschar ** errstr, int tmo)
 359 {
 360 int scan;
 361 uschar hostname[256];
 362 unsigned int portlow, porthigh;
 363
 364 /* extract host and port part */
 365 scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh);
 366 if (scan != 3)
 367   {
 368   if (scan != 2)
 369     {
 370     *errstr = string_sprintf("invalid socket '%s'", hostport);
 371     return -1;
 372     }
 373   porthigh = portlow;
 374   }
 375
 376 return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh,
 377                           tmo, NULL, errstr);
 378 }
 379
 380 int
 381 ip_unixsocket(const uschar * path, uschar ** errstr)
 382 {
 383 int sock;
 384 struct sockaddr_un server;
 385
 386 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 387   {
 388   *errstr = US"can't open UNIX socket.";
 389   return -1;
 390   }
 391
 392 callout_address = string_copy(path);
 393 server.sun_family = AF_UNIX;
 394 Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1);
 395 server.sun_path[sizeof(server.sun_path)-1] = '\0';
 396 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0)
 397   {
 398   int err = errno;
 399   (void)close(sock);
 400   *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
 401                 path, strerror(err));
 402   return -1;
 403   }
 404 return sock;
 405 }
 406
 407 int
 408 ip_streamsocket(const uschar * spec, uschar ** errstr, int tmo)
 409 {
 410 return *spec == '/'
 411   ? ip_unixsocket(spec, errstr) : ip_tcpsocket(spec, errstr, tmo);
 412 }
 413
 414 /*************************************************
 415 *         Set keepalive on a socket              *
 416 *************************************************/
 417
 418 /* Can be called for both incoming and outgoing sockets.
 419
 420 Arguments:
 421   sock       the socket
 422   address    the remote host address, for failure logging
 423   torf       true for outgoing connection, false for incoming
 424
 425 Returns:     nothing
 426 */
 427
 428 void
 429 ip_keepalive(int sock, const uschar *address, BOOL torf)
 430 {
 431 int fodder = 1;
 432 if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 433     (uschar *)(&fodder), sizeof(fodder)) != 0)
 434   log_write(0, LOG_MAIN, "setsockopt(SO_KEEPALIVE) on connection %s %s "
 435     "failed: %s", torf? "to":"from", address, strerror(errno));
 436 }
 437
 438
 439
 440 /*************************************************
 441 *         Receive from a socket with timeout     *
 442 *************************************************/
 443
 444 /*
 445 Arguments:
 446   fd          the file descriptor
 447   timeout     the timeout, seconds
 448 Returns:      TRUE => ready for i/o
 449               FALSE => timed out, or other error
 450 */
 451 BOOL
 452 fd_ready(int fd, int timeout)
 453 {
 454 fd_set select_inset;
 455 time_t start_recv = time(NULL);
 456 int time_left = timeout;
 457 int rc;
 458
 459 if (time_left <= 0)
 460   {
 461   errno = ETIMEDOUT;
 462   return FALSE;
 463   }
 464 /* Wait until the socket is ready */
 465
 466 do
 467   {
 468   struct timeval tv = { time_left, 0 };
 469   FD_ZERO (&select_inset);
 470   FD_SET (fd, &select_inset);
 471
 472   /*DEBUG(D_transport) debug_printf("waiting for data on fd\n");*/
 473   rc = select(fd + 1, (SELECT_ARG2_TYPE *)&select_inset, NULL, NULL, &tv);
 474
 475   /* If some interrupt arrived, just retry. We presume this to be rare,
 476   but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes
 477   select() to exit).
 478
 479   Aug 2004: Somebody set up a cron job that ran exiwhat every 2 minutes, making
 480   the interrupt not at all rare. Since the timeout is typically more than 2
 481   minutes, the effect was to block the timeout completely. To prevent this
 482   happening again, we do an explicit time test and adjust the timeout
 483   accordingly */
 484
 485   if (rc < 0 && errno == EINTR)
 486     {
 487     DEBUG(D_transport) debug_printf("EINTR while waiting for socket data\n");
 488
 489     /* Watch out, 'continue' jumps to the condition, not to the loops top */
 490     time_left = timeout - (time(NULL) - start_recv);
 491     if (time_left > 0) continue;
 492     }
 493
 494   if (rc <= 0)
 495     {
 496     errno = ETIMEDOUT;
 497     return FALSE;
 498     }
 499
 500   /* Checking the FD_ISSET is not enough, if we're interrupted, the
 501   select_inset may still contain the 'input'. */
 502   }
 503 while (rc < 0 || !FD_ISSET(fd, &select_inset));
 504 return TRUE;
 505 }
 506
 507 /* The timeout is implemented using select(), and we loop to cover select()
 508 getting interrupted, and the possibility of select() returning with a positive
 509 result but no ready descriptor. Is this in fact possible?
 510
 511 Arguments:
 512   sock        the socket
 513   buffer      to read into
 514   bufsize     the buffer size
 515   timeout     the timeout
 516
 517 Returns:      > 0 => that much data read
 518               <= 0 on error or EOF; errno set - zero for EOF
 519 */
 520
 521 int
 522 ip_recv(int sock, uschar *buffer, int buffsize, int timeout)
 523 {
 524 int rc;
 525
 526 if (!fd_ready(sock, timeout))
 527   return -1;
 528
 529 /* The socket is ready, read from it (via TLS if it's active). On EOF (i.e.
 530 close down of the connection), set errno to zero; otherwise leave it alone. */
 531
 532 #ifdef SUPPORT_TLS
 533 if (tls_out.active == sock)
 534   rc = tls_read(FALSE, buffer, buffsize);
 535 else if (tls_in.active == sock)
 536   rc = tls_read(TRUE, buffer, buffsize);
 537 else
 538 #endif
 539   rc = recv(sock, buffer, buffsize, 0);
 540
 541 if (rc > 0) return rc;
 542 if (rc == 0) errno = 0;
 543 return -1;
 544 }
 545
 546
 547
 548
 549 /*************************************************
 550 *    Lookup address family of potential socket   *
 551 *************************************************/
 552
 553 /* Given a file-descriptor, check to see if it's a socket and, if so,
 554 return the address family; detects IPv4 vs IPv6.  If not a socket then
 555 return -1.
 556
 557 The value 0 is typically AF_UNSPEC, which should not be seen on a connected
 558 fd.  If the return is -1, the errno will be from getsockname(); probably
 559 ENOTSOCK or ECONNRESET.
 560
 561 Arguments:     socket-or-not fd
 562 Returns:       address family or -1
 563 */
 564
 565 int
 566 ip_get_address_family(int fd)
 567 {
 568 struct sockaddr_storage ss;
 569 socklen_t sslen = sizeof(ss);
 570
 571 if (getsockname(fd, (struct sockaddr *) &ss, &sslen) < 0)
 572   return -1;
 573
 574 return (int) ss.ss_family;
 575 }
 576
 577
 578
 579
 580 /*************************************************
 581 *       Lookup DSCP settings for a socket        *
 582 *************************************************/
 583
 584 struct dscp_name_tableentry {
 585   const uschar *name;
 586   int value;
 587 };
 588 /* Keep both of these tables sorted! */
 589 static struct dscp_name_tableentry dscp_table[] = {
 590 #ifdef IPTOS_DSCP_AF11
 591     { CUS"af11", IPTOS_DSCP_AF11 },
 592     { CUS"af12", IPTOS_DSCP_AF12 },
 593     { CUS"af13", IPTOS_DSCP_AF13 },
 594     { CUS"af21", IPTOS_DSCP_AF21 },
 595     { CUS"af22", IPTOS_DSCP_AF22 },
 596     { CUS"af23", IPTOS_DSCP_AF23 },
 597     { CUS"af31", IPTOS_DSCP_AF31 },
 598     { CUS"af32", IPTOS_DSCP_AF32 },
 599     { CUS"af33", IPTOS_DSCP_AF33 },
 600     { CUS"af41", IPTOS_DSCP_AF41 },
 601     { CUS"af42", IPTOS_DSCP_AF42 },
 602     { CUS"af43", IPTOS_DSCP_AF43 },
 603     { CUS"ef", IPTOS_DSCP_EF },
 604 #endif
 605 #ifdef IPTOS_LOWCOST
 606     { CUS"lowcost", IPTOS_LOWCOST },
 607 #endif
 608     { CUS"lowdelay", IPTOS_LOWDELAY },
 609 #ifdef IPTOS_MINCOST
 610     { CUS"mincost", IPTOS_MINCOST },
 611 #endif
 612     { CUS"reliability", IPTOS_RELIABILITY },
 613     { CUS"throughput", IPTOS_THROUGHPUT }
 614 };
 615 static int dscp_table_size =
 616   sizeof(dscp_table) / sizeof(struct dscp_name_tableentry);
 617
 618 /* DSCP values change by protocol family, and so do the options used for
 619 setsockopt(); this utility does all the lookups.  It takes an unexpanded
 620 option string, expands it, strips off affix whitespace, then checks if it's
 621 a number.  If all of what's left is a number, then that's how the option will
 622 be parsed and success/failure is a range check.  If it's not all a number,
 623 then it must be a supported keyword.
 624
 625 Arguments:
 626   dscp_name   a string, so far unvalidated
 627   af          address_family in use
 628   level       setsockopt level to use
 629   optname     setsockopt name to use
 630   dscp_value  value for dscp_name
 631
 632 Returns: TRUE if okay to setsockopt(), else FALSE
 633
 634 *level and *optname may be set even if FALSE is returned
 635 */
 636
 637 BOOL
 638 dscp_lookup(const uschar *dscp_name, int af,
 639     int *level, int *optname, int *dscp_value)
 640 {
 641 uschar *dscp_lookup, *p;
 642 int first, last;
 643 long rawlong;
 644
 645 if (af == AF_INET)
 646   {
 647   *level = IPPROTO_IP;
 648   *optname = IP_TOS;
 649   }
 650 #if HAVE_IPV6 && defined(IPV6_TCLASS)
 651 else if (af == AF_INET6)
 652   {
 653   *level = IPPROTO_IPV6;
 654   *optname = IPV6_TCLASS;
 655   }
 656 #endif
 657 else
 658   {
 659   DEBUG(D_transport)
 660     debug_printf("Unhandled address family %d in dscp_lookup()\n", af);
 661   return FALSE;
 662   }
 663 if (!dscp_name)
 664   {
 665   DEBUG(D_transport)
 666     debug_printf("[empty DSCP]\n");
 667   return FALSE;
 668   }
 669 dscp_lookup = expand_string(US dscp_name);
 670 if (dscp_lookup == NULL || *dscp_lookup == '\0')
 671   return FALSE;
 672
 673 p = dscp_lookup + Ustrlen(dscp_lookup) - 1;
 674 while (isspace(*p)) *p-- = '\0';
 675 while (isspace(*dscp_lookup) && dscp_lookup < p) dscp_lookup++;
 676 if (*dscp_lookup == '\0')
 677   return FALSE;
 678
 679 rawlong = Ustrtol(dscp_lookup, &p, 0);
 680 if (p != dscp_lookup && *p == '\0')
 681   {
 682   /* We have six bits available, which will end up shifted to fit in 0xFC mask.
 683   RFC 2597 defines the values unshifted. */
 684   if (rawlong < 0 || rawlong > 0x3F)
 685     {
 686     DEBUG(D_transport)
 687       debug_printf("DSCP value %ld out of range, ignored.\n", rawlong);
 688     return FALSE;
 689     }
 690   *dscp_value = rawlong << 2;
 691   return TRUE;
 692   }
 693
 694 first = 0;
 695 last = dscp_table_size;
 696 while (last > first)
 697   {
 698   int middle = (first + last)/2;
 699   int c = Ustrcmp(dscp_lookup, dscp_table[middle].name);
 700   if (c == 0)
 701     {
 702     *dscp_value = dscp_table[middle].value;
 703     return TRUE;
 704     }
 705   else if (c > 0)
 706     first = middle + 1;
 707   else
 708     last = middle;
 709   }
 710 return FALSE;
 711 }
 712
 713 void
 714 dscp_list_to_stream(FILE *stream)
 715 {
 716 int i;
 717 for (i=0; i < dscp_table_size; ++i)
 718   fprintf(stream, "%s\n", dscp_table[i].name);
 719 }
 720
 721
 722 /* End of ip.c */
 723 /* vi: aw ai sw=2
 724 */