1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
|
/*
* Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-sl.c,v 1.65 2005-04-06 21:32:42 mcr Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <pcap.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
#include "ip.h"
#include "tcp.h"
#include "slip.h"
#include "slcompress.h"
static u_int lastlen[2][256];
static u_int lastconn = 255;
static void sliplink_print(const u_char *, const struct ip *, u_int);
static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
u_int
sl_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
register u_int caplen = h->caplen;
register u_int length = h->len;
register const struct ip *ip;
if (caplen < SLIP_HDRLEN) {
printf("[|slip]");
return (caplen);
}
length -= SLIP_HDRLEN;
ip = (struct ip *)(p + SLIP_HDRLEN);
if (eflag)
sliplink_print(p, ip, length);
switch (IP_V(ip)) {
case 4:
ip_print(gndo, (u_char *)ip, length);
break;
#ifdef INET6
case 6:
ip6_print(gndo, (u_char *)ip, length);
break;
#endif
default:
printf ("ip v%d", IP_V(ip));
}
return (SLIP_HDRLEN);
}
u_int
sl_bsdos_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
register u_int caplen = h->caplen;
register u_int length = h->len;
register const struct ip *ip;
if (caplen < SLIP_HDRLEN) {
printf("[|slip]");
return (caplen);
}
length -= SLIP_HDRLEN;
ip = (struct ip *)(p + SLIP_HDRLEN);
#ifdef notdef
if (eflag)
sliplink_print(p, ip, length);
#endif
ip_print(gndo, (u_char *)ip, length);
return (SLIP_HDRLEN);
}
static void
sliplink_print(register const u_char *p, register const struct ip *ip,
register u_int length)
{
int dir;
u_int hlen;
dir = p[SLX_DIR];
putchar(dir == SLIPDIR_IN ? 'I' : 'O');
putchar(' ');
if (nflag) {
/* XXX just dump the header */
register int i;
for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
printf("%02x.", p[i]);
printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
return;
}
switch (p[SLX_CHDR] & 0xf0) {
case TYPE_IP:
printf("ip %d: ", length + SLIP_HDRLEN);
break;
case TYPE_UNCOMPRESSED_TCP:
/*
* The connection id is stored in the IP protocol field.
* Get it from the link layer since sl_uncompress_tcp()
* has restored the IP header copy to IPPROTO_TCP.
*/
lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
hlen = IP_HL(ip);
hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]);
lastlen[dir][lastconn] = length - (hlen << 2);
printf("utcp %d: ", lastconn);
break;
default:
if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
compressed_sl_print(&p[SLX_CHDR], ip,
length, dir);
printf(": ");
} else
printf("slip-%d!: ", p[SLX_CHDR]);
}
}
static const u_char *
print_sl_change(const char *str, register const u_char *cp)
{
register u_int i;
if ((i = *cp++) == 0) {
i = EXTRACT_16BITS(cp);
cp += 2;
}
printf(" %s%d", str, i);
return (cp);
}
static const u_char *
print_sl_winchange(register const u_char *cp)
{
register short i;
if ((i = *cp++) == 0) {
i = EXTRACT_16BITS(cp);
cp += 2;
}
if (i >= 0)
printf(" W+%d", i);
else
printf(" W%d", i);
return (cp);
}
static void
compressed_sl_print(const u_char *chdr, const struct ip *ip,
u_int length, int dir)
{
register const u_char *cp = chdr;
register u_int flags, hlen;
flags = *cp++;
if (flags & NEW_C) {
lastconn = *cp++;
printf("ctcp %d", lastconn);
} else
printf("ctcp *");
/* skip tcp checksum */
cp += 2;
switch (flags & SPECIALS_MASK) {
case SPECIAL_I:
printf(" *SA+%d", lastlen[dir][lastconn]);
break;
case SPECIAL_D:
printf(" *S+%d", lastlen[dir][lastconn]);
break;
default:
if (flags & NEW_U)
cp = print_sl_change("U=", cp);
if (flags & NEW_W)
cp = print_sl_winchange(cp);
if (flags & NEW_A)
cp = print_sl_change("A+", cp);
if (flags & NEW_S)
cp = print_sl_change("S+", cp);
break;
}
if (flags & NEW_I)
cp = print_sl_change("I+", cp);
/*
* 'hlen' is the length of the uncompressed TCP/IP header (in words).
* 'cp - chdr' is the length of the compressed header.
* 'length - hlen' is the amount of data in the packet.
*/
hlen = IP_HL(ip);
hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]);
lastlen[dir][lastconn] = length - (hlen << 2);
printf(" %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr));
}
|