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