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 * $FreeBSD$ 22 */ 23 24 #ifndef lint 25 static const char rcsid[] _U_ = 26 "@(#) $Header: /tcpdump/master/tcpdump/print-sl.c,v 1.65 2005/04/06 21:32:42 mcr Exp $ (LBL)"; 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <tcpdump-stdinc.h> 34 35 #include <pcap.h> 36 #include <stdio.h> 37 38 #include "interface.h" 39 #include "addrtoname.h" 40 #include "extract.h" /* must come after interface.h */ 41 42 #include "ip.h" 43 #include "tcp.h" 44 #include "slip.h" 45 #include "slcompress.h" 46 47 static u_int lastlen[2][256]; 48 static u_int lastconn = 255; 49 50 static void sliplink_print(const u_char *, const struct ip *, u_int); 51 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int); 52 53 u_int 54 sl_if_print(const struct pcap_pkthdr *h, const u_char *p) 55 { 56 register u_int caplen = h->caplen; 57 register u_int length = h->len; 58 register const struct ip *ip; 59 60 if (caplen < SLIP_HDRLEN) { 61 printf("[|slip]"); 62 return (caplen); 63 } 64 65 length -= SLIP_HDRLEN; 66 67 ip = (struct ip *)(p + SLIP_HDRLEN); 68 69 if (eflag) 70 sliplink_print(p, ip, length); 71 72 switch (IP_V(ip)) { 73 case 4: 74 ip_print(gndo, (u_char *)ip, length); 75 break; 76 #ifdef INET6 77 case 6: 78 ip6_print((u_char *)ip, length); 79 break; 80 #endif 81 default: 82 printf ("ip v%d", IP_V(ip)); 83 } 84 85 return (SLIP_HDRLEN); 86 } 87 88 u_int 89 sl_bsdos_if_print(const struct pcap_pkthdr *h, const u_char *p) 90 { 91 register u_int caplen = h->caplen; 92 register u_int length = h->len; 93 register const struct ip *ip; 94 95 if (caplen < SLIP_HDRLEN) { 96 printf("[|slip]"); 97 return (caplen); 98 } 99 100 length -= SLIP_HDRLEN; 101 102 ip = (struct ip *)(p + SLIP_HDRLEN); 103 104 #ifdef notdef 105 if (eflag) 106 sliplink_print(p, ip, length); 107 #endif 108 109 ip_print(gndo, (u_char *)ip, length); 110 111 return (SLIP_HDRLEN); 112 } 113 114 static void 115 sliplink_print(register const u_char *p, register const struct ip *ip, 116 register u_int length) 117 { 118 int dir; 119 u_int hlen; 120 121 dir = p[SLX_DIR]; 122 putchar(dir == SLIPDIR_IN ? 'I' : 'O'); 123 putchar(' '); 124 125 if (nflag) { 126 /* XXX just dump the header */ 127 register int i; 128 129 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i) 130 printf("%02x.", p[i]); 131 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]); 132 return; 133 } 134 switch (p[SLX_CHDR] & 0xf0) { 135 136 case TYPE_IP: 137 printf("ip %d: ", length + SLIP_HDRLEN); 138 break; 139 140 case TYPE_UNCOMPRESSED_TCP: 141 /* 142 * The connection id is stored in the IP protocol field. 143 * Get it from the link layer since sl_uncompress_tcp() 144 * has restored the IP header copy to IPPROTO_TCP. 145 */ 146 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p; 147 hlen = IP_HL(ip); 148 hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]); 149 lastlen[dir][lastconn] = length - (hlen << 2); 150 printf("utcp %d: ", lastconn); 151 break; 152 153 default: 154 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) { 155 compressed_sl_print(&p[SLX_CHDR], ip, 156 length, dir); 157 printf(": "); 158 } else 159 printf("slip-%d!: ", p[SLX_CHDR]); 160 } 161 } 162 163 static const u_char * 164 print_sl_change(const char *str, register const u_char *cp) 165 { 166 register u_int i; 167 168 if ((i = *cp++) == 0) { 169 i = EXTRACT_16BITS(cp); 170 cp += 2; 171 } 172 printf(" %s%d", str, i); 173 return (cp); 174 } 175 176 static const u_char * 177 print_sl_winchange(register const u_char *cp) 178 { 179 register short i; 180 181 if ((i = *cp++) == 0) { 182 i = EXTRACT_16BITS(cp); 183 cp += 2; 184 } 185 if (i >= 0) 186 printf(" W+%d", i); 187 else 188 printf(" W%d", i); 189 return (cp); 190 } 191 192 static void 193 compressed_sl_print(const u_char *chdr, const struct ip *ip, 194 u_int length, int dir) 195 { 196 register const u_char *cp = chdr; 197 register u_int flags, hlen; 198 199 flags = *cp++; 200 if (flags & NEW_C) { 201 lastconn = *cp++; 202 printf("ctcp %d", lastconn); 203 } else 204 printf("ctcp *"); 205 206 /* skip tcp checksum */ 207 cp += 2; 208 209 switch (flags & SPECIALS_MASK) { 210 case SPECIAL_I: 211 printf(" *SA+%d", lastlen[dir][lastconn]); 212 break; 213 214 case SPECIAL_D: 215 printf(" *S+%d", lastlen[dir][lastconn]); 216 break; 217 218 default: 219 if (flags & NEW_U) 220 cp = print_sl_change("U=", cp); 221 if (flags & NEW_W) 222 cp = print_sl_winchange(cp); 223 if (flags & NEW_A) 224 cp = print_sl_change("A+", cp); 225 if (flags & NEW_S) 226 cp = print_sl_change("S+", cp); 227 break; 228 } 229 if (flags & NEW_I) 230 cp = print_sl_change("I+", cp); 231 232 /* 233 * 'hlen' is the length of the uncompressed TCP/IP header (in words). 234 * 'cp - chdr' is the length of the compressed header. 235 * 'length - hlen' is the amount of data in the packet. 236 */ 237 hlen = IP_HL(ip); 238 hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]); 239 lastlen[dir][lastconn] = length - (hlen << 2); 240 printf(" %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)); 241 } 242