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print-sctp.c

/* Copyright (c) 2001 NETLAB, Temple University
 * Copyright (c) 2001 Protocol Engineering Lab, University of Delaware
 *
 * Jerry Heinz <gheinz@astro.temple.edu>
 * John Fiore <jfiore@joda.cis.temple.edu>
 * Armando L. Caro Jr. <acaro@cis.udel.edu>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.13.2.2 2003/11/16 08:51:44 guy Exp $ (NETLAB/PEL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include "sctpHeader.h"
#include "sctpConstants.h"
#include <assert.h>

#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"                /* must come after interface.h */
#include "ip.h"
#ifdef INET6
#include "ip6.h"
#endif

void sctp_print(const u_char *bp,        /* beginning of sctp packet */
            const u_char *bp2,       /* beginning of enclosing */
            u_int sctpPacketLength)  /* ip packet */
{
  const struct sctpHeader *sctpPktHdr;
  const struct ip *ip;
#ifdef INET6
  const struct ip6_hdr *ip6;
#endif
  const u_char *cp;
  const void *endPacketPtr;
  u_short sourcePort, destPort;
  int chunkCount;
  const struct sctpChunkDesc *chunkDescPtr;
  const void *nextChunk;

  sctpPktHdr = (const struct sctpHeader*) bp;
  endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;

  if( (u_long) endPacketPtr > (u_long) snapend)
    endPacketPtr = (const void *) snapend;
  ip = (struct ip *)bp2;
#ifdef INET6
  if (IP_V(ip) == 6)
    ip6 = (const struct ip6_hdr *)bp2;
  else
    ip6 = NULL;
#endif /*INET6*/
  cp = (const u_char *)(sctpPktHdr + 1);
  if (cp > snapend)
    {
      printf("[|sctp]");
      return;
    }

  if (sctpPacketLength < sizeof(struct sctpHeader))
    {
      (void)printf("truncated-sctp - %ld bytes missing!",
               (long)sctpPacketLength-sizeof(struct sctpHeader));
      return;
    }

  /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
  /*                          is now only as long as the payload  */

  sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
  destPort = EXTRACT_16BITS(&sctpPktHdr->destination);

#ifdef INET6
  if (ip6) {
    (void)printf("%s.%d > %s.%d: sctp",
      ip6addr_string(&ip6->ip6_src),
      sourcePort,
      ip6addr_string(&ip6->ip6_dst),
      destPort);
  } else
#endif /*INET6*/
  {
    (void)printf("%s.%d > %s.%d: sctp",
      ipaddr_string(&ip->ip_src),
      sourcePort,
      ipaddr_string(&ip->ip_dst),
      destPort);
  }
  fflush(stdout);

  if (vflag < 2)
      return;

  /* cycle through all chunks, printing information on each one */
  for (chunkCount = 0,
       chunkDescPtr = (const struct sctpChunkDesc *)
          ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
       chunkDescPtr != NULL &&
       ( (const void *)
          ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
         <= endPacketPtr);

       chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
    {
      u_short align;
      const u_char *chunkEnd;

      chunkEnd = ((const u_char*)chunkDescPtr + EXTRACT_16BITS(&chunkDescPtr->chunkLength));

      align=EXTRACT_16BITS(&chunkDescPtr->chunkLength) % 4;
      if (align != 0)
      align = 4 - align;

      nextChunk = (const void *) (chunkEnd + align);

      printf("\n\t%d) ", chunkCount+1);
      switch (chunkDescPtr->chunkID)
      {
      case SCTP_DATA :
        {
          const struct sctpDataPart *dataHdrPtr;

          printf("[DATA] ");

          if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
            == SCTP_DATA_UNORDERED)
            printf("(U)");

          if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
            == SCTP_DATA_FIRST_FRAG)
            printf("(B)");

          if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
            == SCTP_DATA_LAST_FRAG)
            printf("(E)");

          if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
             == SCTP_DATA_UNORDERED)
            ||
            ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
             == SCTP_DATA_FIRST_FRAG)
            ||
            ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
             == SCTP_DATA_LAST_FRAG) )
            printf(" ");

          dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);

          printf("[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN));
          printf("[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId));
          printf("[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence));
          printf("[PPID 0x%x] ", EXTRACT_32BITS(&dataHdrPtr->payloadtype));
          fflush(stdout);

          if (vflag)          /* if verbose output is specified */
            {                      /* at the command line */
            const u_char *payloadPtr;

            printf("[Payload");

            if (!xflag && !qflag) {
                  payloadPtr = (const u_char *) (++dataHdrPtr);
                  printf(":");
                  if (htons(chunkDescPtr->chunkLength) <
                      sizeof(struct sctpDataPart)+
                      sizeof(struct sctpChunkDesc)+1) {
                        printf("bogus chunk length %u]",
                            htons(chunkDescPtr->chunkLength));
                        return;
                  }
                  default_print(payloadPtr,
                        htons(chunkDescPtr->chunkLength) -
                        (sizeof(struct sctpDataPart)+
                        sizeof(struct sctpChunkDesc)+1));
            } else
                  printf("]");
            }
          break;
        }
      case SCTP_INITIATION :
        {
          const struct sctpInitiation *init;

          printf("[INIT] ");
          init=(const struct sctpInitiation*)(chunkDescPtr+1);
          printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
          printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
          printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
          printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
          printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));

#if(0) /* ALC you can add code for optional params here */
          if( (init+1) < chunkEnd )
            printf(" @@@@@ UNFINISHED @@@@@@%s\n",
                 "Optional params present, but not printed.");
#endif
          break;
        }
      case SCTP_INITIATION_ACK :
        {
          const struct sctpInitiation *init;

          printf("[INIT ACK] ");
          init=(const struct sctpInitiation*)(chunkDescPtr+1);
          printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
          printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
          printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
          printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
          printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));

#if(0) /* ALC you can add code for optional params here */
          if( (init+1) < chunkEnd )
            printf(" @@@@@ UNFINISHED @@@@@@%s\n",
                 "Optional params present, but not printed.");
#endif
          break;
        }
      case SCTP_SELECTIVE_ACK:
        {
          const struct sctpSelectiveAck *sack;
          const struct sctpSelectiveFrag *frag;
          int fragNo, tsnNo;
          const u_long *dupTSN;

          printf("[SACK] ");
          sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
          printf("[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN));
          printf("[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd));
          printf("[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc));
          printf("[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns));


          /* print gaps */
          for (frag = ( (const struct sctpSelectiveFrag *)
                    ((const struct sctpSelectiveAck *) sack+1)),
               fragNo=0;
             (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
             frag++, fragNo++)
            printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
                 fragNo+1,
                 EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
                 EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd));


          /* print duplicate TSNs */
          for (dupTSN = (const u_long*)frag, tsnNo=0;
             (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
             dupTSN++, tsnNo++)
            printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
                EXTRACT_32BITS(dupTSN));

          break;
        }
      case SCTP_HEARTBEAT_REQUEST :
        {
          const struct sctpHBsender *hb;

          hb=(const struct sctpHBsender*)chunkDescPtr;

          printf("[HB REQ] ");

          break;
        }
      case SCTP_HEARTBEAT_ACK :
        printf("[HB ACK] ");
        break;
      case SCTP_ABORT_ASSOCIATION :
        printf("[ABORT] ");
        break;
      case SCTP_SHUTDOWN :
        printf("[SHUTDOWN] ");
        break;
      case SCTP_SHUTDOWN_ACK :
        printf("[SHUTDOWN ACK] ");
        break;
      case SCTP_OPERATION_ERR :
        printf("[OP ERR] ");
        break;
      case SCTP_COOKIE_ECHO :
        printf("[COOKIE ECHO] ");
        break;
      case SCTP_COOKIE_ACK :
        printf("[COOKIE ACK] ");
        break;
      case SCTP_ECN_ECHO :
        printf("[ECN ECHO] ");
        break;
      case SCTP_ECN_CWR :
        printf("[ECN CWR] ");
        break;
      case SCTP_SHUTDOWN_COMPLETE :
        printf("[SHUTDOWN COMPLETE] ");
        break;
      case SCTP_FORWARD_CUM_TSN :
        printf("[FOR CUM TSN] ");
        break;
      case SCTP_RELIABLE_CNTL :
        printf("[REL CTRL] ");
        break;
      case SCTP_RELIABLE_CNTL_ACK :
        printf("[REL CTRL ACK] ");
        break;
      default :
        printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
        return;
      }
    }
}

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