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 1.51 2000-09-28 06:43:08 guy 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 #include <netinet/in_systm.h>
  45
  46 #include <ctype.h>
  47 #include <netdb.h>
  48 #include <pcap.h>
  49 #include <stdio.h>
  50
  51 #include "interface.h"
  52 #include "addrtoname.h"
  53 #include "extract.h"                    /* must come after interface.h */
  54
  55 #include "ip.h"
  56 #include "tcp.h"
  57
  58 #include <net/slcompress.h>
  59 #include <net/slip.h>
  60
  61 static u_int lastlen[2][256];
  62 static u_int lastconn = 255;
  63
  64 static void sliplink_print(const u_char *, const struct ip *, u_int);
  65 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
  66
  67 /* XXX BSD/OS 2.1 compatibility */
  68 #if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR)
  69 #define SLIP_HDRLEN SLC_BPFHDR
  70 #define SLX_DIR 0
  71 #define SLX_CHDR (SLC_BPFHDRLEN - 1)
  72 #define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN)
  73 #endif
  74
  75 /* XXX needs more hacking to work right */
  76
  77 void
  78 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  79 {
  80         register u_int caplen = h->caplen;
  81         register u_int length = h->len;
  82         register const struct ip *ip;
  83
  84         ts_print(&h->ts);
  85
  86         if (caplen < SLIP_HDRLEN) {
  87                 printf("[|slip]");
  88                 goto out;
  89         }
  90         /*
  91          * Some printers want to get back at the link level addresses,
  92          * and/or check that they're not walking off the end of the packet.
  93          * Rather than pass them all the way down, we set these globals.
  94          */
  95         packetp = p;
  96         snapend = p + caplen;
  97
  98         length -= SLIP_HDRLEN;
  99
 100         ip = (struct ip *)(p + SLIP_HDRLEN);
 101
 102         if (eflag)
 103                 sliplink_print(p, ip, length);
 104
 105         switch (ip->ip_v) {
 106         case 4:
 107                 ip_print((u_char *)ip, length);
 108                 break;
 109 #ifdef INET6
 110         case 6:
 111                 ip6_print((u_char *)ip, length);
 112                 break;
 113 #endif
 114         default:
 115                 printf ("ip v%d", ip->ip_v);
 116         }
 117
 118         if (xflag)
 119                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 120  out:
 121         putchar('\n');
 122 }
 123
 124
 125 void
 126 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 127 {
 128         register u_int caplen = h->caplen;
 129         register u_int length = h->len;
 130         register const struct ip *ip;
 131
 132         ts_print(&h->ts);
 133
 134         if (caplen < SLIP_HDRLEN) {
 135                 printf("[|slip]");
 136                 goto out;
 137         }
 138         /*
 139          * Some printers want to get back at the link level addresses,
 140          * and/or check that they're not walking off the end of the packet.
 141          * Rather than pass them all the way down, we set these globals.
 142          */
 143         packetp = p;
 144         snapend = p + caplen;
 145
 146         length -= SLIP_HDRLEN;
 147
 148         ip = (struct ip *)(p + SLIP_HDRLEN);
 149
 150 #ifdef notdef
 151         if (eflag)
 152                 sliplink_print(p, ip, length);
 153 #endif
 154
 155         ip_print((u_char *)ip, length);
 156
 157         if (xflag)
 158                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 159  out:
 160         putchar('\n');
 161 }
 162
 163 static void
 164 sliplink_print(register const u_char *p, register const struct ip *ip,
 165                register u_int length)
 166 {
 167         int dir;
 168         u_int hlen;
 169
 170         dir = p[SLX_DIR];
 171         putchar(dir == SLIPDIR_IN ? 'I' : 'O');
 172         putchar(' ');
 173
 174         if (nflag) {
 175                 /* XXX just dump the header */
 176                 register int i;
 177
 178                 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
 179                         printf("%02x.", p[i]);
 180                 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
 181                 return;
 182         }
 183         switch (p[SLX_CHDR] & 0xf0) {
 184
 185         case TYPE_IP:
 186                 printf("ip %d: ", length + SLIP_HDRLEN);
 187                 break;
 188
 189         case TYPE_UNCOMPRESSED_TCP:
 190                 /*
 191                  * The connection id is stored in the IP protocol field.
 192                  * Get it from the link layer since sl_uncompress_tcp()
 193                  * has restored the IP header copy to IPPROTO_TCP.
 194                  */
 195                 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
 196                 hlen = ip->ip_hl;
 197                 hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
 198                 lastlen[dir][lastconn] = length - (hlen << 2);
 199                 printf("utcp %d: ", lastconn);
 200                 break;
 201
 202         default:
 203                 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
 204                         compressed_sl_print(&p[SLX_CHDR], ip,
 205                             length, dir);
 206                         printf(": ");
 207                 } else
 208                         printf("slip-%d!: ", p[SLX_CHDR]);
 209         }
 210 }
 211
 212 static const u_char *
 213 print_sl_change(const char *str, register const u_char *cp)
 214 {
 215         register u_int i;
 216
 217         if ((i = *cp++) == 0) {
 218                 i = EXTRACT_16BITS(cp);
 219                 cp += 2;
 220         }
 221         printf(" %s%d", str, i);
 222         return (cp);
 223 }
 224
 225 static const u_char *
 226 print_sl_winchange(register const u_char *cp)
 227 {
 228         register short i;
 229
 230         if ((i = *cp++) == 0) {
 231                 i = EXTRACT_16BITS(cp);
 232                 cp += 2;
 233         }
 234         if (i >= 0)
 235                 printf(" W+%d", i);
 236         else
 237                 printf(" W%d", i);
 238         return (cp);
 239 }
 240
 241 static void
 242 compressed_sl_print(const u_char *chdr, const struct ip *ip,
 243                     u_int length, int dir)
 244 {
 245         register const u_char *cp = chdr;
 246         register u_int flags, hlen;
 247
 248         flags = *cp++;
 249         if (flags & NEW_C) {
 250                 lastconn = *cp++;
 251                 printf("ctcp %d", lastconn);
 252         } else
 253                 printf("ctcp *");
 254
 255         /* skip tcp checksum */
 256         cp += 2;
 257
 258         switch (flags & SPECIALS_MASK) {
 259         case SPECIAL_I:
 260                 printf(" *SA+%d", lastlen[dir][lastconn]);
 261                 break;
 262
 263         case SPECIAL_D:
 264                 printf(" *S+%d", lastlen[dir][lastconn]);
 265                 break;
 266
 267         default:
 268                 if (flags & NEW_U)
 269                         cp = print_sl_change("U=", cp);
 270                 if (flags & NEW_W)
 271                         cp = print_sl_winchange(cp);
 272                 if (flags & NEW_A)
 273                         cp = print_sl_change("A+", cp);
 274                 if (flags & NEW_S)
 275                         cp = print_sl_change("S+", cp);
 276                 break;
 277         }
 278         if (flags & NEW_I)
 279                 cp = print_sl_change("I+", cp);
 280
 281         /*
 282          * 'hlen' is the length of the uncompressed TCP/IP header (in words).
 283          * 'cp - chdr' is the length of the compressed header.
 284          * 'length - hlen' is the amount of data in the packet.
 285          */
 286         hlen = ip->ip_hl;
 287         hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off;
 288         lastlen[dir][lastconn] = length - (hlen << 2);
 289         printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
 290 }
 291 #else
 292 #include <sys/types.h>
 293 #include <sys/time.h>
 294
 295 #include <pcap.h>
 296 #include <stdio.h>
 297
 298 #include "interface.h"
 299
 300 void
 301 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 302 {
 303
 304         error("not configured for slip");
 305         /* NOTREACHED */
 306 }
 307
 308 void
 309 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 310 {
 311
 312         error("not configured for slip");
 313         /* NOTREACHED */
 314 }
 315 #endif