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print-sl.c

/*
 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-sl.c,v 1.62.2.2 2003/11/16 08:51:44 guy Exp $ (LBL)";
#endif

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

#include <tcpdump-stdinc.h>

#include <pcap.h>
#include <stdio.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"                /* must come after interface.h */

#include "ip.h"
#include "tcp.h"
#include "slip.h"
#include "slcompress.h"

static u_int lastlen[2][256];
static u_int lastconn = 255;

static void sliplink_print(const u_char *, const struct ip *, u_int);
static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);

u_int
sl_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
      register u_int caplen = h->caplen;
      register u_int length = h->len;
      register const struct ip *ip;

      if (caplen < SLIP_HDRLEN) {
            printf("[|slip]");
            return (caplen);
      }

      length -= SLIP_HDRLEN;

      ip = (struct ip *)(p + SLIP_HDRLEN);

      if (eflag)
            sliplink_print(p, ip, length);

      switch (IP_V(ip)) {
      case 4:
            ip_print((u_char *)ip, length);
            break;
#ifdef INET6
      case 6:
            ip6_print((u_char *)ip, length);
            break;
#endif
      default:
            printf ("ip v%d", IP_V(ip));
      }

      return (SLIP_HDRLEN);
}

u_int
sl_bsdos_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
      register u_int caplen = h->caplen;
      register u_int length = h->len;
      register const struct ip *ip;

      if (caplen < SLIP_HDRLEN) {
            printf("[|slip]");
            return (caplen);
      }

      length -= SLIP_HDRLEN;

      ip = (struct ip *)(p + SLIP_HDRLEN);

#ifdef notdef
      if (eflag)
            sliplink_print(p, ip, length);
#endif

      ip_print((u_char *)ip, length);

      return (SLIP_HDRLEN);
}

static void
sliplink_print(register const u_char *p, register const struct ip *ip,
             register u_int length)
{
      int dir;
      u_int hlen;

      dir = p[SLX_DIR];
      putchar(dir == SLIPDIR_IN ? 'I' : 'O');
      putchar(' ');

      if (nflag) {
            /* XXX just dump the header */
            register int i;

            for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
                  printf("%02x.", p[i]);
            printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
            return;
      }
      switch (p[SLX_CHDR] & 0xf0) {

      case TYPE_IP:
            printf("ip %d: ", length + SLIP_HDRLEN);
            break;

      case TYPE_UNCOMPRESSED_TCP:
            /*
             * The connection id is stored in the IP protocol field.
             * Get it from the link layer since sl_uncompress_tcp()
             * has restored the IP header copy to IPPROTO_TCP.
             */
            lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
            hlen = IP_HL(ip);
            hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]);
            lastlen[dir][lastconn] = length - (hlen << 2);
            printf("utcp %d: ", lastconn);
            break;

      default:
            if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
                  compressed_sl_print(&p[SLX_CHDR], ip,
                      length, dir);
                  printf(": ");
            } else
                  printf("slip-%d!: ", p[SLX_CHDR]);
      }
}

static const u_char *
print_sl_change(const char *str, register const u_char *cp)
{
      register u_int i;

      if ((i = *cp++) == 0) {
            i = EXTRACT_16BITS(cp);
            cp += 2;
      }
      printf(" %s%d", str, i);
      return (cp);
}

static const u_char *
print_sl_winchange(register const u_char *cp)
{
      register short i;

      if ((i = *cp++) == 0) {
            i = EXTRACT_16BITS(cp);
            cp += 2;
      }
      if (i >= 0)
            printf(" W+%d", i);
      else
            printf(" W%d", i);
      return (cp);
}

static void
compressed_sl_print(const u_char *chdr, const struct ip *ip,
                u_int length, int dir)
{
      register const u_char *cp = chdr;
      register u_int flags, hlen;

      flags = *cp++;
      if (flags & NEW_C) {
            lastconn = *cp++;
            printf("ctcp %d", lastconn);
      } else
            printf("ctcp *");

      /* skip tcp checksum */
      cp += 2;

      switch (flags & SPECIALS_MASK) {
      case SPECIAL_I:
            printf(" *SA+%d", lastlen[dir][lastconn]);
            break;

      case SPECIAL_D:
            printf(" *S+%d", lastlen[dir][lastconn]);
            break;

      default:
            if (flags & NEW_U)
                  cp = print_sl_change("U=", cp);
            if (flags & NEW_W)
                  cp = print_sl_winchange(cp);
            if (flags & NEW_A)
                  cp = print_sl_change("A+", cp);
            if (flags & NEW_S)
                  cp = print_sl_change("S+", cp);
            break;
      }
      if (flags & NEW_I)
            cp = print_sl_change("I+", cp);

      /*
       * 'hlen' is the length of the uncompressed TCP/IP header (in words).
       * 'cp - chdr' is the length of the compressed header.
       * 'length - hlen' is the amount of data in the packet.
       */
      hlen = IP_HL(ip);
      hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]);
      lastlen[dir][lastconn] = length - (hlen << 2);
      printf(" %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr));
}

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