source: libpacketdump/ip_33.c @ e78e408

/*
 *
 * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand.
 * All rights reserved.
 *
 * This file is part of libtrace.
 *
 * This code has been developed by the University of Waikato WAND
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libtrace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * libtrace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */
/* DCCP */
#include <stdio.h>
#include <inttypes.h>
#include <dlfcn.h>
#include "libpacketdump.h"
#include <netinet/tcp.h>
#include <netinet/in.h>

struct dccphdr {
        uint16_t source;
        uint16_t dest;
        uint8_t type:4;
        uint8_t ccval:4;
        uint32_t seq:24;
        uint8_t doff;
        uint8_t ndp:4;
        uint8_t cslen:4;
        uint16_t check;
};

static char *dccp_types[]={
        "DCCP-Request packet",
        "DCCP-Response packet",
        "DCCP-Data packet",
        "DCCP-Ack packet",
        "DCCP-DataAck packet",
        "DCCP-CloseReq packet",
        "DCCP-Close packet",
        "DCCP-Reset packet",
        "DCCP-Move packet",
        };

DLLEXPORT void decode(int link_type UNUSED,const char *packet,unsigned len)
{
        struct dccphdr *dccp = (struct dccphdr*)packet;
        DISPLAYS(dccp, source," DCCP: Source %i");
        DISPLAYS(dccp, dest," Dest %i");
        if (len>4) {
                printf("\n DCCP: Type %i",dccp->type);
                if (dccp->type<sizeof(dccp_types)) {
                        printf(" (%s)\n",dccp_types[dccp->type]);
                } else {
                        printf(" (Unknown)\n");
                }
                printf(" DCCP: CcVal %i\n",dccp->ccval);
        }
        else  {
                printf("\n"); 
                return;
        }
        if (len>7)
                printf(" DCCP: Seq %u\n",dccp->seq); // htonwhat?
        else
                return;
        DISPLAY(dccp, doff," DCCP: Dataoff: %i\n");
        if (len>9)
                printf(" DCCP: NDP %i CsLen: %i\n",dccp->ndp,dccp->cslen);
        else {
                return;
        }
        /* Should this be byteswapped??? */
        DISPLAY(dccp, check," DCCP: Checksum: %i\n");
        if (htons(dccp->source) < htons(dccp->dest)) 
                decode_next(packet+dccp->doff*4,len-dccp->doff*4,"dccp",htons(dccp->source));
        else
                decode_next(packet+dccp->doff*4,len-dccp->doff*4,"dccp",htons(dccp->dest));
        return;
}