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 1.42 1999-10-07 23:47:12 mcr Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_NET_SLIP_H
  28 #include <sys/param.h>
  29 #include <sys/time.h>
  30 #include <sys/timeb.h>
  31 #include <sys/file.h>
  32 #include <sys/ioctl.h>
  33 #include <sys/mbuf.h>
  34 #include <sys/socket.h>
  35
  36 #if __STDC__
  37 struct rtentry;
  38 #endif
  39 #include <net/if.h>
  40
  41 #include <netinet/in.h>
  42 #include <netinet/in_systm.h>
  43 #include <netinet/ip.h>
  44 #include <netinet/if_ether.h>
  45 #include <netinet/ip_var.h>
  46 #include <netinet/udp.h>
  47 #include <netinet/udp_var.h>
  48 #include <netinet/tcp.h>
  49 #include <netinet/tcpip.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         ip_print((u_char *)ip, length);
 108
 109         if (xflag)
 110                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 111  out:
 112         putchar('\n');
 113 }
 114
 115
 116 void
 117 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 118 {
 119         register u_int caplen = h->caplen;
 120         register u_int length = h->len;
 121         register const struct ip *ip;
 122
 123         ts_print(&h->ts);
 124
 125         if (caplen < SLIP_HDRLEN) {
 126                 printf("[|slip]");
 127                 goto out;
 128         }
 129         /*
 130          * Some printers want to get back at the link level addresses,
 131          * and/or check that they're not walking off the end of the packet.
 132          * Rather than pass them all the way down, we set these globals.
 133          */
 134         packetp = p;
 135         snapend = p + caplen;
 136
 137         length -= SLIP_HDRLEN;
 138
 139         ip = (struct ip *)(p + SLIP_HDRLEN);
 140
 141 #ifdef notdef
 142         if (eflag)
 143                 sliplink_print(p, ip, length);
 144 #endif
 145
 146         ip_print((u_char *)ip, length);
 147
 148         if (xflag)
 149                 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
 150  out:
 151         putchar('\n');
 152 }
 153
 154 static void
 155 sliplink_print(register const u_char *p, register const struct ip *ip,
 156                register u_int length)
 157 {
 158         int dir;
 159         u_int hlen;
 160
 161         dir = p[SLX_DIR];
 162         putchar(dir == SLIPDIR_IN ? 'I' : 'O');
 163         putchar(' ');
 164
 165         if (nflag) {
 166                 /* XXX just dump the header */
 167                 register int i;
 168
 169                 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
 170                         printf("%02x.", p[i]);
 171                 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
 172                 return;
 173         }
 174         switch (p[SLX_CHDR] & 0xf0) {
 175
 176         case TYPE_IP:
 177                 printf("ip %d: ", length + SLIP_HDRLEN);
 178                 break;
 179
 180         case TYPE_UNCOMPRESSED_TCP:
 181                 /*
 182                  * The connection id is stored in the IP protocol field.
 183                  * Get it from the link layer since sl_uncompress_tcp()
 184                  * has restored the IP header copy to IPPROTO_TCP.
 185                  */
 186                 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
 187                 hlen = ip->ip_hl;
 188                 hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
 189                 lastlen[dir][lastconn] = length - (hlen << 2);
 190                 printf("utcp %d: ", lastconn);
 191                 break;
 192
 193         default:
 194                 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
 195                         compressed_sl_print(&p[SLX_CHDR], ip,
 196                             length, dir);
 197                         printf(": ");
 198                 } else
 199                         printf("slip-%d!: ", p[SLX_CHDR]);
 200         }
 201 }
 202
 203 static const u_char *
 204 print_sl_change(const char *str, register const u_char *cp)
 205 {
 206         register u_int i;
 207
 208         if ((i = *cp++) == 0) {
 209                 i = EXTRACT_16BITS(cp);
 210                 cp += 2;
 211         }
 212         printf(" %s%d", str, i);
 213         return (cp);
 214 }
 215
 216 static const u_char *
 217 print_sl_winchange(register const u_char *cp)
 218 {
 219         register short i;
 220
 221         if ((i = *cp++) == 0) {
 222                 i = EXTRACT_16BITS(cp);
 223                 cp += 2;
 224         }
 225         if (i >= 0)
 226                 printf(" W+%d", i);
 227         else
 228                 printf(" W%d", i);
 229         return (cp);
 230 }
 231
 232 static void
 233 compressed_sl_print(const u_char *chdr, const struct ip *ip,
 234                     u_int length, int dir)
 235 {
 236         register const u_char *cp = chdr;
 237         register u_int flags, hlen;
 238
 239         flags = *cp++;
 240         if (flags & NEW_C) {
 241                 lastconn = *cp++;
 242                 printf("ctcp %d", lastconn);
 243         } else
 244                 printf("ctcp *");
 245
 246         /* skip tcp checksum */
 247         cp += 2;
 248
 249         switch (flags & SPECIALS_MASK) {
 250         case SPECIAL_I:
 251                 printf(" *SA+%d", lastlen[dir][lastconn]);
 252                 break;
 253
 254         case SPECIAL_D:
 255                 printf(" *S+%d", lastlen[dir][lastconn]);
 256                 break;
 257
 258         default:
 259                 if (flags & NEW_U)
 260                         cp = print_sl_change("U=", cp);
 261                 if (flags & NEW_W)
 262                         cp = print_sl_winchange(cp);
 263                 if (flags & NEW_A)
 264                         cp = print_sl_change("A+", cp);
 265                 if (flags & NEW_S)
 266                         cp = print_sl_change("S+", cp);
 267                 break;
 268         }
 269         if (flags & NEW_I)
 270                 cp = print_sl_change("I+", cp);
 271
 272         /*
 273          * 'hlen' is the length of the uncompressed TCP/IP header (in words).
 274          * 'cp - chdr' is the length of the compressed header.
 275          * 'length - hlen' is the amount of data in the packet.
 276          */
 277         hlen = ip->ip_hl;
 278         hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off;
 279         lastlen[dir][lastconn] = length - (hlen << 2);
 280         printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
 281 }
 282 #else
 283 #include <sys/types.h>
 284 #include <sys/time.h>
 285
 286 #include <pcap.h>
 287 #include <stdio.h>
 288
 289 #include "interface.h"
 290
 291 void
 292 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 293 {
 294
 295         error("not configured for slip");
 296         /* NOTREACHED */
 297 }
 298
 299 void
 300 sl_bsdos_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 #endif