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 1.46 1999-11-21 12:38:24 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 #if __STDC__
  41 struct rtentry;
  42 #endif
  43 #include <net/if.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/in_systm.h>
  47 #include <netinet/ip.h>
  48 #include <netinet/if_ether.h>
  49 #include <netinet/udp.h>
  50 #include <netinet/tcp.h>
  51
  52 #include <net/slcompress.h>
  53 #include <net/slip.h>
  54
  55 #include <ctype.h>
  56 #include <netdb.h>
  57 #include <pcap.h>
  58 #include <stdio.h>
  59
  60 #include "interface.h"
  61 #include "addrtoname.h"
  62 #include "extract.h"                    /* must come after interface.h */
  63
  64 static u_int lastlen[2][256];
  65 static u_int lastconn = 255;
  66
  67 static void sliplink_print(const u_char *, const struct ip *, u_int);
  68 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
  69
  70 /* XXX BSD/OS 2.1 compatibility */
  71 #if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR)
  72 #define SLIP_HDRLEN SLC_BPFHDR
  73 #define SLX_DIR 0
  74 #define SLX_CHDR (SLC_BPFHDRLEN - 1)
  75 #define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN)
  76 #endif
  77
  78 /* XXX needs more hacking to work right */
  79
  80 void
  81 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  82 {
  83         register u_int caplen = h->caplen;
  84         register u_int length = h->len;
  85         register const struct ip *ip;
  86
  87         ts_print(&h->ts);
  88
  89         if (caplen < SLIP_HDRLEN) {
  90                 printf("[|slip]");
  91                 goto out;
  92         }
  93         /*
  94          * Some printers want to get back at the link level addresses,
  95          * and/or check that they're not walking off the end of the packet.
  96          * Rather than pass them all the way down, we set these globals.
  97          */
  98         packetp = p;
  99         snapend = p + caplen;
 100
 101         length -= SLIP_HDRLEN;
 102
 103         ip = (struct ip *)(p + SLIP_HDRLEN);
 104
 105         if (eflag)
 106                 sliplink_print(p, ip, length);
 107
 108         switch (ip->ip_v) {
 109         case 4:
 110                 ip_print((u_char *)ip, length);
 111                 break;
 112 #ifdef INET6
 113         case 6:
 114                 ip6_print((u_char *)ip, length);
 115                 break;
 116 #endif
 117         default:
 118                 printf ("ip v%d", ip->ip_v);
 119         }
 120
 121         if (xflag)
 122                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 123  out:
 124         putchar('\n');
 125 }
 126
 127
 128 void
 129 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 130 {
 131         register u_int caplen = h->caplen;
 132         register u_int length = h->len;
 133         register const struct ip *ip;
 134
 135         ts_print(&h->ts);
 136
 137         if (caplen < SLIP_HDRLEN) {
 138                 printf("[|slip]");
 139                 goto out;
 140         }
 141         /*
 142          * Some printers want to get back at the link level addresses,
 143          * and/or check that they're not walking off the end of the packet.
 144          * Rather than pass them all the way down, we set these globals.
 145          */
 146         packetp = p;
 147         snapend = p + caplen;
 148
 149         length -= SLIP_HDRLEN;
 150
 151         ip = (struct ip *)(p + SLIP_HDRLEN);
 152
 153 #ifdef notdef
 154         if (eflag)
 155                 sliplink_print(p, ip, length);
 156 #endif
 157
 158         ip_print((u_char *)ip, length);
 159
 160         if (xflag)
 161                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 162  out:
 163         putchar('\n');
 164 }
 165
 166 static void
 167 sliplink_print(register const u_char *p, register const struct ip *ip,
 168                register u_int length)
 169 {
 170         int dir;
 171         u_int hlen;
 172
 173         dir = p[SLX_DIR];
 174         putchar(dir == SLIPDIR_IN ? 'I' : 'O');
 175         putchar(' ');
 176
 177         if (nflag) {
 178                 /* XXX just dump the header */
 179                 register int i;
 180
 181                 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
 182                         printf("%02x.", p[i]);
 183                 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
 184                 return;
 185         }
 186         switch (p[SLX_CHDR] & 0xf0) {
 187
 188         case TYPE_IP:
 189                 printf("ip %d: ", length + SLIP_HDRLEN);
 190                 break;
 191
 192         case TYPE_UNCOMPRESSED_TCP:
 193                 /*
 194                  * The connection id is stored in the IP protocol field.
 195                  * Get it from the link layer since sl_uncompress_tcp()
 196                  * has restored the IP header copy to IPPROTO_TCP.
 197                  */
 198                 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
 199                 hlen = ip->ip_hl;
 200                 hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
 201                 lastlen[dir][lastconn] = length - (hlen << 2);
 202                 printf("utcp %d: ", lastconn);
 203                 break;
 204
 205         default:
 206                 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
 207                         compressed_sl_print(&p[SLX_CHDR], ip,
 208                             length, dir);
 209                         printf(": ");
 210                 } else
 211                         printf("slip-%d!: ", p[SLX_CHDR]);
 212         }
 213 }
 214
 215 static const u_char *
 216 print_sl_change(const char *str, register const u_char *cp)
 217 {
 218         register u_int i;
 219
 220         if ((i = *cp++) == 0) {
 221                 i = EXTRACT_16BITS(cp);
 222                 cp += 2;
 223         }
 224         printf(" %s%d", str, i);
 225         return (cp);
 226 }
 227
 228 static const u_char *
 229 print_sl_winchange(register const u_char *cp)
 230 {
 231         register short i;
 232
 233         if ((i = *cp++) == 0) {
 234                 i = EXTRACT_16BITS(cp);
 235                 cp += 2;
 236         }
 237         if (i >= 0)
 238                 printf(" W+%d", i);
 239         else
 240                 printf(" W%d", i);
 241         return (cp);
 242 }
 243
 244 static void
 245 compressed_sl_print(const u_char *chdr, const struct ip *ip,
 246                     u_int length, int dir)
 247 {
 248         register const u_char *cp = chdr;
 249         register u_int flags, hlen;
 250
 251         flags = *cp++;
 252         if (flags & NEW_C) {
 253                 lastconn = *cp++;
 254                 printf("ctcp %d", lastconn);
 255         } else
 256                 printf("ctcp *");
 257
 258         /* skip tcp checksum */
 259         cp += 2;
 260
 261         switch (flags & SPECIALS_MASK) {
 262         case SPECIAL_I:
 263                 printf(" *SA+%d", lastlen[dir][lastconn]);
 264                 break;
 265
 266         case SPECIAL_D:
 267                 printf(" *S+%d", lastlen[dir][lastconn]);
 268                 break;
 269
 270         default:
 271                 if (flags & NEW_U)
 272                         cp = print_sl_change("U=", cp);
 273                 if (flags & NEW_W)
 274                         cp = print_sl_winchange(cp);
 275                 if (flags & NEW_A)
 276                         cp = print_sl_change("A+", cp);
 277                 if (flags & NEW_S)
 278                         cp = print_sl_change("S+", cp);
 279                 break;
 280         }
 281         if (flags & NEW_I)
 282                 cp = print_sl_change("I+", cp);
 283
 284         /*
 285          * 'hlen' is the length of the uncompressed TCP/IP header (in words).
 286          * 'cp - chdr' is the length of the compressed header.
 287          * 'length - hlen' is the amount of data in the packet.
 288          */
 289         hlen = ip->ip_hl;
 290         hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off;
 291         lastlen[dir][lastconn] = length - (hlen << 2);
 292         printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
 293 }
 294 #else
 295 #include <sys/types.h>
 296 #include <sys/time.h>
 297
 298 #include <pcap.h>
 299 #include <stdio.h>
 300
 301 #include "interface.h"
 302
 303 void
 304 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 305 {
 306
 307         error("not configured for slip");
 308         /* NOTREACHED */
 309 }
 310
 311 void
 312 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 313 {
 314
 315         error("not configured for slip");
 316         /* NOTREACHED */
 317 }
 318 #endif