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 1.53 2000-10-03 02:26:53 itojun 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
  43 #include <netinet/in.h>
  44
  45 #include <ctype.h>
  46 #include <netdb.h>
  47 #include <pcap.h>
  48 #include <stdio.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52 #include "extract.h"                    /* must come after interface.h */
  53
  54 #include "ip.h"
  55 #include "tcp.h"
  56
  57 #include <net/slcompress.h>
  58 #include <net/slip.h>
  59
  60 static u_int lastlen[2][256];
  61 static u_int lastconn = 255;
  62
  63 static void sliplink_print(const u_char *, const struct ip *, u_int);
  64 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
  65
  66 /* XXX BSD/OS 2.1 compatibility */
  67 #if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR)
  68 #define SLIP_HDRLEN SLC_BPFHDR
  69 #define SLX_DIR 0
  70 #define SLX_CHDR (SLC_BPFHDRLEN - 1)
  71 #define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN)
  72 #endif
  73
  74 /* XXX needs more hacking to work right */
  75
  76 void
  77 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  78 {
  79         register u_int caplen = h->caplen;
  80         register u_int length = h->len;
  81         register const struct ip *ip;
  82
  83         ts_print(&h->ts);
  84
  85         if (caplen < SLIP_HDRLEN) {
  86                 printf("[|slip]");
  87                 goto out;
  88         }
  89         /*
  90          * Some printers want to get back at the link level addresses,
  91          * and/or check that they're not walking off the end of the packet.
  92          * Rather than pass them all the way down, we set these globals.
  93          */
  94         packetp = p;
  95         snapend = p + caplen;
  96
  97         length -= SLIP_HDRLEN;
  98
  99         ip = (struct ip *)(p + SLIP_HDRLEN);
 100
 101         if (eflag)
 102                 sliplink_print(p, ip, length);
 103
 104         switch (ip->ip_v) {
 105         case 4:
 106                 ip_print((u_char *)ip, length);
 107                 break;
 108 #ifdef INET6
 109         case 6:
 110                 ip6_print((u_char *)ip, length);
 111                 break;
 112 #endif
 113         default:
 114                 printf ("ip v%d", ip->ip_v);
 115         }
 116
 117         if (xflag)
 118                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 119  out:
 120         putchar('\n');
 121 }
 122
 123
 124 void
 125 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 126 {
 127         register u_int caplen = h->caplen;
 128         register u_int length = h->len;
 129         register const struct ip *ip;
 130
 131         ts_print(&h->ts);
 132
 133         if (caplen < SLIP_HDRLEN) {
 134                 printf("[|slip]");
 135                 goto out;
 136         }
 137         /*
 138          * Some printers want to get back at the link level addresses,
 139          * and/or check that they're not walking off the end of the packet.
 140          * Rather than pass them all the way down, we set these globals.
 141          */
 142         packetp = p;
 143         snapend = p + caplen;
 144
 145         length -= SLIP_HDRLEN;
 146
 147         ip = (struct ip *)(p + SLIP_HDRLEN);
 148
 149 #ifdef notdef
 150         if (eflag)
 151                 sliplink_print(p, ip, length);
 152 #endif
 153
 154         ip_print((u_char *)ip, length);
 155
 156         if (xflag)
 157                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 158  out:
 159         putchar('\n');
 160 }
 161
 162 static void
 163 sliplink_print(register const u_char *p, register const struct ip *ip,
 164                register u_int length)
 165 {
 166         int dir;
 167         u_int hlen;
 168
 169         dir = p[SLX_DIR];
 170         putchar(dir == SLIPDIR_IN ? 'I' : 'O');
 171         putchar(' ');
 172
 173         if (nflag) {
 174                 /* XXX just dump the header */
 175                 register int i;
 176
 177                 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
 178                         printf("%02x.", p[i]);
 179                 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
 180                 return;
 181         }
 182         switch (p[SLX_CHDR] & 0xf0) {
 183
 184         case TYPE_IP:
 185                 printf("ip %d: ", length + SLIP_HDRLEN);
 186                 break;
 187
 188         case TYPE_UNCOMPRESSED_TCP:
 189                 /*
 190                  * The connection id is stored in the IP protocol field.
 191                  * Get it from the link layer since sl_uncompress_tcp()
 192                  * has restored the IP header copy to IPPROTO_TCP.
 193                  */
 194                 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
 195                 hlen = ip->ip_hl;
 196                 hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]);
 197                 lastlen[dir][lastconn] = length - (hlen << 2);
 198                 printf("utcp %d: ", lastconn);
 199                 break;
 200
 201         default:
 202                 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
 203                         compressed_sl_print(&p[SLX_CHDR], ip,
 204                             length, dir);
 205                         printf(": ");
 206                 } else
 207                         printf("slip-%d!: ", p[SLX_CHDR]);
 208         }
 209 }
 210
 211 static const u_char *
 212 print_sl_change(const char *str, register const u_char *cp)
 213 {
 214         register u_int i;
 215
 216         if ((i = *cp++) == 0) {
 217                 i = EXTRACT_16BITS(cp);
 218                 cp += 2;
 219         }
 220         printf(" %s%d", str, i);
 221         return (cp);
 222 }
 223
 224 static const u_char *
 225 print_sl_winchange(register const u_char *cp)
 226 {
 227         register short i;
 228
 229         if ((i = *cp++) == 0) {
 230                 i = EXTRACT_16BITS(cp);
 231                 cp += 2;
 232         }
 233         if (i >= 0)
 234                 printf(" W+%d", i);
 235         else
 236                 printf(" W%d", i);
 237         return (cp);
 238 }
 239
 240 static void
 241 compressed_sl_print(const u_char *chdr, const struct ip *ip,
 242                     u_int length, int dir)
 243 {
 244         register const u_char *cp = chdr;
 245         register u_int flags, hlen;
 246
 247         flags = *cp++;
 248         if (flags & NEW_C) {
 249                 lastconn = *cp++;
 250                 printf("ctcp %d", lastconn);
 251         } else
 252                 printf("ctcp *");
 253
 254         /* skip tcp checksum */
 255         cp += 2;
 256
 257         switch (flags & SPECIALS_MASK) {
 258         case SPECIAL_I:
 259                 printf(" *SA+%d", lastlen[dir][lastconn]);
 260                 break;
 261
 262         case SPECIAL_D:
 263                 printf(" *S+%d", lastlen[dir][lastconn]);
 264                 break;
 265
 266         default:
 267                 if (flags & NEW_U)
 268                         cp = print_sl_change("U=", cp);
 269                 if (flags & NEW_W)
 270                         cp = print_sl_winchange(cp);
 271                 if (flags & NEW_A)
 272                         cp = print_sl_change("A+", cp);
 273                 if (flags & NEW_S)
 274                         cp = print_sl_change("S+", cp);
 275                 break;
 276         }
 277         if (flags & NEW_I)
 278                 cp = print_sl_change("I+", cp);
 279
 280         /*
 281          * 'hlen' is the length of the uncompressed TCP/IP header (in words).
 282          * 'cp - chdr' is the length of the compressed header.
 283          * 'length - hlen' is the amount of data in the packet.
 284          */
 285         hlen = ip->ip_hl;
 286         hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]);
 287         lastlen[dir][lastconn] = length - (hlen << 2);
 288         printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
 289 }
 290 #else
 291 #include <sys/types.h>
 292 #include <sys/time.h>
 293
 294 #include <pcap.h>
 295 #include <stdio.h>
 296
 297 #include "interface.h"
 298
 299 void
 300 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 301 {
 302
 303         error("not configured for slip");
 304         /* NOTREACHED */
 305 }
 306
 307 void
 308 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 309 {
 310
 311         error("not configured for slip");
 312         /* NOTREACHED */
 313 }
 314 #endif