The Tcpdump Group git mirrors - tcpdump/blob - print-sl.c

   1 /*
   2  * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-sl.c,v 1.47 2000-07-01 03:39:09 assar Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #ifdef HAVE_NET_SLIP_H
  32 #include <sys/param.h>
  33 #include <sys/time.h>
  34 #include <sys/timeb.h>
  35 #include <sys/file.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/socket.h>
  39
  40 struct mbuf;
  41 struct rtentry;
  42 #include <net/if.h>
  43
  44 #include <netinet/in.h>
  45 #include <netinet/in_systm.h>
  46 #include <netinet/ip.h>
  47 #include <netinet/if_ether.h>
  48 #include <netinet/udp.h>
  49 #include <netinet/tcp.h>
  50
  51 #include <net/slcompress.h>
  52 #include <net/slip.h>
  53
  54 #include <ctype.h>
  55 #include <netdb.h>
  56 #include <pcap.h>
  57 #include <stdio.h>
  58
  59 #include "interface.h"
  60 #include "addrtoname.h"
  61 #include "extract.h"                    /* must come after interface.h */
  62
  63 static u_int lastlen[2][256];
  64 static u_int lastconn = 255;
  65
  66 static void sliplink_print(const u_char *, const struct ip *, u_int);
  67 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
  68
  69 /* XXX BSD/OS 2.1 compatibility */
  70 #if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR)
  71 #define SLIP_HDRLEN SLC_BPFHDR
  72 #define SLX_DIR 0
  73 #define SLX_CHDR (SLC_BPFHDRLEN - 1)
  74 #define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN)
  75 #endif
  76
  77 /* XXX needs more hacking to work right */
  78
  79 void
  80 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  81 {
  82         register u_int caplen = h->caplen;
  83         register u_int length = h->len;
  84         register const struct ip *ip;
  85
  86         ts_print(&h->ts);
  87
  88         if (caplen < SLIP_HDRLEN) {
  89                 printf("[|slip]");
  90                 goto out;
  91         }
  92         /*
  93          * Some printers want to get back at the link level addresses,
  94          * and/or check that they're not walking off the end of the packet.
  95          * Rather than pass them all the way down, we set these globals.
  96          */
  97         packetp = p;
  98         snapend = p + caplen;
  99
 100         length -= SLIP_HDRLEN;
 101
 102         ip = (struct ip *)(p + SLIP_HDRLEN);
 103
 104         if (eflag)
 105                 sliplink_print(p, ip, length);
 106
 107         switch (ip->ip_v) {
 108         case 4:
 109                 ip_print((u_char *)ip, length);
 110                 break;
 111 #ifdef INET6
 112         case 6:
 113                 ip6_print((u_char *)ip, length);
 114                 break;
 115 #endif
 116         default:
 117                 printf ("ip v%d", ip->ip_v);
 118         }
 119
 120         if (xflag)
 121                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 122  out:
 123         putchar('\n');
 124 }
 125
 126
 127 void
 128 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 129 {
 130         register u_int caplen = h->caplen;
 131         register u_int length = h->len;
 132         register const struct ip *ip;
 133
 134         ts_print(&h->ts);
 135
 136         if (caplen < SLIP_HDRLEN) {
 137                 printf("[|slip]");
 138                 goto out;
 139         }
 140         /*
 141          * Some printers want to get back at the link level addresses,
 142          * and/or check that they're not walking off the end of the packet.
 143          * Rather than pass them all the way down, we set these globals.
 144          */
 145         packetp = p;
 146         snapend = p + caplen;
 147
 148         length -= SLIP_HDRLEN;
 149
 150         ip = (struct ip *)(p + SLIP_HDRLEN);
 151
 152 #ifdef notdef
 153         if (eflag)
 154                 sliplink_print(p, ip, length);
 155 #endif
 156
 157         ip_print((u_char *)ip, length);
 158
 159         if (xflag)
 160                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 161  out:
 162         putchar('\n');
 163 }
 164
 165 static void
 166 sliplink_print(register const u_char *p, register const struct ip *ip,
 167                register u_int length)
 168 {
 169         int dir;
 170         u_int hlen;
 171
 172         dir = p[SLX_DIR];
 173         putchar(dir == SLIPDIR_IN ? 'I' : 'O');
 174         putchar(' ');
 175
 176         if (nflag) {
 177                 /* XXX just dump the header */
 178                 register int i;
 179
 180                 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
 181                         printf("%02x.", p[i]);
 182                 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
 183                 return;
 184         }
 185         switch (p[SLX_CHDR] & 0xf0) {
 186
 187         case TYPE_IP:
 188                 printf("ip %d: ", length + SLIP_HDRLEN);
 189                 break;
 190
 191         case TYPE_UNCOMPRESSED_TCP:
 192                 /*
 193                  * The connection id is stored in the IP protocol field.
 194                  * Get it from the link layer since sl_uncompress_tcp()
 195                  * has restored the IP header copy to IPPROTO_TCP.
 196                  */
 197                 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
 198                 hlen = ip->ip_hl;
 199                 hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
 200                 lastlen[dir][lastconn] = length - (hlen << 2);
 201                 printf("utcp %d: ", lastconn);
 202                 break;
 203
 204         default:
 205                 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
 206                         compressed_sl_print(&p[SLX_CHDR], ip,
 207                             length, dir);
 208                         printf(": ");
 209                 } else
 210                         printf("slip-%d!: ", p[SLX_CHDR]);
 211         }
 212 }
 213
 214 static const u_char *
 215 print_sl_change(const char *str, register const u_char *cp)
 216 {
 217         register u_int i;
 218
 219         if ((i = *cp++) == 0) {
 220                 i = EXTRACT_16BITS(cp);
 221                 cp += 2;
 222         }
 223         printf(" %s%d", str, i);
 224         return (cp);
 225 }
 226
 227 static const u_char *
 228 print_sl_winchange(register const u_char *cp)
 229 {
 230         register short i;
 231
 232         if ((i = *cp++) == 0) {
 233                 i = EXTRACT_16BITS(cp);
 234                 cp += 2;
 235         }
 236         if (i >= 0)
 237                 printf(" W+%d", i);
 238         else
 239                 printf(" W%d", i);
 240         return (cp);
 241 }
 242
 243 static void
 244 compressed_sl_print(const u_char *chdr, const struct ip *ip,
 245                     u_int length, int dir)
 246 {
 247         register const u_char *cp = chdr;
 248         register u_int flags, hlen;
 249
 250         flags = *cp++;
 251         if (flags & NEW_C) {
 252                 lastconn = *cp++;
 253                 printf("ctcp %d", lastconn);
 254         } else
 255                 printf("ctcp *");
 256
 257         /* skip tcp checksum */
 258         cp += 2;
 259
 260         switch (flags & SPECIALS_MASK) {
 261         case SPECIAL_I:
 262                 printf(" *SA+%d", lastlen[dir][lastconn]);
 263                 break;
 264
 265         case SPECIAL_D:
 266                 printf(" *S+%d", lastlen[dir][lastconn]);
 267                 break;
 268
 269         default:
 270                 if (flags & NEW_U)
 271                         cp = print_sl_change("U=", cp);
 272                 if (flags & NEW_W)
 273                         cp = print_sl_winchange(cp);
 274                 if (flags & NEW_A)
 275                         cp = print_sl_change("A+", cp);
 276                 if (flags & NEW_S)
 277                         cp = print_sl_change("S+", cp);
 278                 break;
 279         }
 280         if (flags & NEW_I)
 281                 cp = print_sl_change("I+", cp);
 282
 283         /*
 284          * 'hlen' is the length of the uncompressed TCP/IP header (in words).
 285          * 'cp - chdr' is the length of the compressed header.
 286          * 'length - hlen' is the amount of data in the packet.
 287          */
 288         hlen = ip->ip_hl;
 289         hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off;
 290         lastlen[dir][lastconn] = length - (hlen << 2);
 291         printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
 292 }
 293 #else
 294 #include <sys/types.h>
 295 #include <sys/time.h>
 296
 297 #include <pcap.h>
 298 #include <stdio.h>
 299
 300 #include "interface.h"
 301
 302 void
 303 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 304 {
 305
 306         error("not configured for slip");
 307         /* NOTREACHED */
 308 }
 309
 310 void
 311 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 312 {
 313
 314         error("not configured for slip");
 315         /* NOTREACHED */
 316 }
 317 #endif