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 sigalrm_seen = FALSE;
 222 if (timeout > 0) alarm(timeout);
 223 rc = connect(sock, s_ptr, s_len);
 224 save_errno = errno;
 225 alarm(0);
 226
 227 /* There is a testing facility for simulating a connection timeout, as I
 228 can't think of any other way of doing this. It converts a connection refused
 229 into a timeout if the timeout is set to 999999. */
 230
 231 if (running_in_test_harness  && save_errno == ECONNREFUSED && timeout == 999999)
 232   {
 233   rc = -1;
 234   save_errno = EINTR;
 235   sigalrm_seen = TRUE;
 236   }
 237
 238 /* Success */
 239
 240 if (rc >= 0) return 0;
 241
 242 /* A failure whose error code is "Interrupted system call" is in fact
 243 an externally applied timeout if the signal handler has been run. */
 244
 245 errno = save_errno == EINTR && sigalrm_seen ? ETIMEDOUT : save_errno;
 246 return -1;
 247 }
 248
 249
 250
 251 /*************************************************
 252 *    Create connected socket to remote host      *
 253 *************************************************/
 254
 255 /* Create a socket and connect to host (name or number, ipv6 ok)
 256    at one of port-range.
 257
 258 Arguments:
 259   type          SOCK_DGRAM or SOCK_STREAM
 260   af            AF_INET6 or AF_INET for the socket type
 261   address       the remote address, in text form
 262   portlo,porthi the remote port range
 263   timeout       a timeout
 264   connhost      if not NULL, host_item filled in with connection details
 265   errstr        pointer for allocated string on error
 266
 267 Return:
 268   socket fd, or -1 on failure (having allocated an error string)
 269 */
 270 int
 271 ip_connectedsocket(int type, const uschar * hostname, int portlo, int porthi,
 272         int timeout, host_item * connhost, uschar ** errstr)
 273 {
 274 int namelen, port;
 275 host_item shost;
 276 host_item *h;
 277 int af = 0, fd, fd4 = -1, fd6 = -1;
 278
 279 shost.next = NULL;
 280 shost.address = NULL;
 281 shost.port = portlo;
 282 shost.mx = -1;
 283
 284 namelen = Ustrlen(hostname);
 285
 286 /* Anything enclosed in [] must be an IP address. */
 287
 288 if (hostname[0] == '[' &&
 289     hostname[namelen - 1] == ']')
 290   {
 291   uschar * host = string_copy(hostname);
 292   host[namelen - 1] = 0;
 293   host++;
 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_copy(hostname);
 306
 307 /* Otherwise lookup IP address(es) from the name */
 308
 309 else
 310   {
 311   shost.name = string_copy(hostname);
 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 server.sun_family = AF_UNIX;
 393 Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1);
 394 server.sun_path[sizeof(server.sun_path)-1] = '\0';
 395 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0)
 396   {
 397   int err = errno;
 398   (void)close(sock);
 399   *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
 400                 path, strerror(err));
 401   return -1;
 402   }
 403 return sock;
 404 }
 405
 406 int
 407 ip_streamsocket(const uschar * spec, uschar ** errstr, int tmo)
 408 {
 409 return *spec == '/'
 410   ? ip_unixsocket(spec, errstr) : ip_tcpsocket(spec, errstr, tmo);
 411 }
 412
 413 /*************************************************
 414 *         Set keepalive on a socket              *
 415 *************************************************/
 416
 417 /* Can be called for both incoming and outgoing sockets.
 418
 419 Arguments:
 420   sock       the socket
 421   address    the remote host address, for failure logging
 422   torf       true for outgoing connection, false for incoming
 423
 424 Returns:     nothing
 425 */
 426
 427 void
 428 ip_keepalive(int sock, const uschar *address, BOOL torf)
 429 {
 430 int fodder = 1;
 431 if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 432     (uschar *)(&fodder), sizeof(fodder)) != 0)
 433   log_write(0, LOG_MAIN, "setsockopt(SO_KEEPALIVE) on connection %s %s "
 434     "failed: %s", torf? "to":"from", address, strerror(errno));
 435 }
 436
 437
 438
 439 /*************************************************
 440 *         Receive from a socket with timeout     *
 441 *************************************************/
 442
 443 /*
 444 Arguments:
 445   fd          the file descriptor
 446   timeout     the timeout, seconds
 447 Returns:      TRUE => ready for i/o
 448               FALSE => timed out, or other error
 449 */
 450 BOOL
 451 fd_ready(int fd, int timeout)
 452 {
 453 fd_set select_inset;
 454 struct timeval tv;
 455 time_t start_recv = time(NULL);
 456 int rc;
 457
 458 if (timeout <= 0)
 459   {
 460   errno = ETIMEDOUT;
 461   return FALSE;
 462   }
 463 /* Wait until the socket is ready */
 464
 465 do
 466   {
 467   FD_ZERO (&select_inset);
 468   FD_SET (fd, &select_inset);
 469   tv.tv_sec = timeout;
 470   tv.tv_usec = 0;
 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. */
 483
 484   if (rc < 0 && errno == EINTR)
 485     {
 486     DEBUG(D_transport) debug_printf("EINTR while waiting for socket data\n");
 487     if (time(NULL) - start_recv < timeout) continue;
 488     DEBUG(D_transport) debug_printf("total wait time exceeds timeout\n");
 489     }
 490
 491   /* Handle a timeout, and treat any other select error as a timeout, including
 492   an EINTR when we have been in this loop for longer than timeout. */
 493
 494   if (rc <= 0)
 495     {
 496     errno = ETIMEDOUT;
 497     return FALSE;
 498     }
 499
 500   /* If the socket is ready, break out of the loop. */
 501   }
 502 while (rc < 0 || !FD_ISSET(fd, &select_inset));
 503 return TRUE;
 504 }
 505
 506 /* The timeout is implemented using select(), and we loop to cover select()
 507 getting interrupted, and the possibility of select() returning with a positive
 508 result but no ready descriptor. Is this in fact possible?
 509
 510 Arguments:
 511   sock        the socket
 512   buffer      to read into
 513   bufsize     the buffer size
 514   timeout     the timeout
 515
 516 Returns:      > 0 => that much data read
 517               <= 0 on error or EOF; errno set - zero for EOF
 518 */
 519
 520 int
 521 ip_recv(int sock, uschar *buffer, int buffsize, int timeout)
 522 {
 523 int rc;
 524
 525 if (!fd_ready(sock, timeout))
 526   return -1;
 527
 528 /* The socket is ready, read from it (via TLS if it's active). On EOF (i.e.
 529 close down of the connection), set errno to zero; otherwise leave it alone. */
 530
 531 #ifdef SUPPORT_TLS
 532 if (tls_out.active == sock)
 533   rc = tls_read(FALSE, buffer, buffsize);
 534 else if (tls_in.active == sock)
 535   rc = tls_read(TRUE, buffer, buffsize);
 536 else
 537 #endif
 538   rc = recv(sock, buffer, buffsize, 0);
 539
 540 if (rc > 0) return rc;
 541 if (rc == 0) errno = 0;
 542 return -1;
 543 }
 544
 545
 546
 547
 548 /*************************************************
 549 *    Lookup address family of potential socket   *
 550 *************************************************/
 551
 552 /* Given a file-descriptor, check to see if it's a socket and, if so,
 553 return the address family; detects IPv4 vs IPv6.  If not a socket then
 554 return -1.
 555
 556 The value 0 is typically AF_UNSPEC, which should not be seen on a connected
 557 fd.  If the return is -1, the errno will be from getsockname(); probably
 558 ENOTSOCK or ECONNRESET.
 559
 560 Arguments:     socket-or-not fd
 561 Returns:       address family or -1
 562 */
 563
 564 int
 565 ip_get_address_family(int fd)
 566 {
 567 struct sockaddr_storage ss;
 568 socklen_t sslen = sizeof(ss);
 569
 570 if (getsockname(fd, (struct sockaddr *) &ss, &sslen) < 0)
 571   return -1;
 572
 573 return (int) ss.ss_family;
 574 }
 575
 576
 577
 578
 579 /*************************************************
 580 *       Lookup DSCP settings for a socket        *
 581 *************************************************/
 582
 583 struct dscp_name_tableentry {
 584   const uschar *name;
 585   int value;
 586 };
 587 /* Keep both of these tables sorted! */
 588 static struct dscp_name_tableentry dscp_table[] = {
 589 #ifdef IPTOS_DSCP_AF11
 590     { CUS"af11", IPTOS_DSCP_AF11 },
 591     { CUS"af12", IPTOS_DSCP_AF12 },
 592     { CUS"af13", IPTOS_DSCP_AF13 },
 593     { CUS"af21", IPTOS_DSCP_AF21 },
 594     { CUS"af22", IPTOS_DSCP_AF22 },
 595     { CUS"af23", IPTOS_DSCP_AF23 },
 596     { CUS"af31", IPTOS_DSCP_AF31 },
 597     { CUS"af32", IPTOS_DSCP_AF32 },
 598     { CUS"af33", IPTOS_DSCP_AF33 },
 599     { CUS"af41", IPTOS_DSCP_AF41 },
 600     { CUS"af42", IPTOS_DSCP_AF42 },
 601     { CUS"af43", IPTOS_DSCP_AF43 },
 602     { CUS"ef", IPTOS_DSCP_EF },
 603 #endif
 604 #ifdef IPTOS_LOWCOST
 605     { CUS"lowcost", IPTOS_LOWCOST },
 606 #endif
 607     { CUS"lowdelay", IPTOS_LOWDELAY },
 608 #ifdef IPTOS_MINCOST
 609     { CUS"mincost", IPTOS_MINCOST },
 610 #endif
 611     { CUS"reliability", IPTOS_RELIABILITY },
 612     { CUS"throughput", IPTOS_THROUGHPUT }
 613 };
 614 static int dscp_table_size =
 615   sizeof(dscp_table) / sizeof(struct dscp_name_tableentry);
 616
 617 /* DSCP values change by protocol family, and so do the options used for
 618 setsockopt(); this utility does all the lookups.  It takes an unexpanded
 619 option string, expands it, strips off affix whitespace, then checks if it's
 620 a number.  If all of what's left is a number, then that's how the option will
 621 be parsed and success/failure is a range check.  If it's not all a number,
 622 then it must be a supported keyword.
 623
 624 Arguments:
 625   dscp_name   a string, so far unvalidated
 626   af          address_family in use
 627   level       setsockopt level to use
 628   optname     setsockopt name to use
 629   dscp_value  value for dscp_name
 630
 631 Returns: TRUE if okay to setsockopt(), else FALSE
 632
 633 *level and *optname may be set even if FALSE is returned
 634 */
 635
 636 BOOL
 637 dscp_lookup(const uschar *dscp_name, int af,
 638     int *level, int *optname, int *dscp_value)
 639 {
 640 uschar *dscp_lookup, *p;
 641 int first, last;
 642 long rawlong;
 643
 644 if (af == AF_INET)
 645   {
 646   *level = IPPROTO_IP;
 647   *optname = IP_TOS;
 648   }
 649 #if HAVE_IPV6 && defined(IPV6_TCLASS)
 650 else if (af == AF_INET6)
 651   {
 652   *level = IPPROTO_IPV6;
 653   *optname = IPV6_TCLASS;
 654   }
 655 #endif
 656 else
 657   {
 658   DEBUG(D_transport)
 659     debug_printf("Unhandled address family %d in dscp_lookup()\n", af);
 660   return FALSE;
 661   }
 662 if (!dscp_name)
 663   {
 664   DEBUG(D_transport)
 665     debug_printf("[empty DSCP]\n");
 666   return FALSE;
 667   }
 668 dscp_lookup = expand_string(US dscp_name);
 669 if (dscp_lookup == NULL || *dscp_lookup == '\0')
 670   return FALSE;
 671
 672 p = dscp_lookup + Ustrlen(dscp_lookup) - 1;
 673 while (isspace(*p)) *p-- = '\0';
 674 while (isspace(*dscp_lookup) && dscp_lookup < p) dscp_lookup++;
 675 if (*dscp_lookup == '\0')
 676   return FALSE;
 677
 678 rawlong = Ustrtol(dscp_lookup, &p, 0);
 679 if (p != dscp_lookup && *p == '\0')
 680   {
 681   /* We have six bits available, which will end up shifted to fit in 0xFC mask.
 682   RFC 2597 defines the values unshifted. */
 683   if (rawlong < 0 || rawlong > 0x3F)
 684     {
 685     DEBUG(D_transport)
 686       debug_printf("DSCP value %ld out of range, ignored.\n", rawlong);
 687     return FALSE;
 688     }
 689   *dscp_value = rawlong << 2;
 690   return TRUE;
 691   }
 692
 693 first = 0;
 694 last = dscp_table_size;
 695 while (last > first)
 696   {
 697   int middle = (first + last)/2;
 698   int c = Ustrcmp(dscp_lookup, dscp_table[middle].name);
 699   if (c == 0)
 700     {
 701     *dscp_value = dscp_table[middle].value;
 702     return TRUE;
 703     }
 704   else if (c > 0)
 705     first = middle + 1;
 706   else
 707     last = middle;
 708   }
 709 return FALSE;
 710 }
 711
 712 void
 713 dscp_list_to_stream(FILE *stream)
 714 {
 715 int i;
 716 for (i=0; i < dscp_table_size; ++i)
 717   fprintf(stream, "%s\n", dscp_table[i].name);
 718 }
 719
 720
 721 /* End of ip.c */
 722 /* vi: aw ai sw=2
 723 */