1 /* 2 * Copyright (c) 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-chdlc.c,v 1.43 2005-11-29 08:56:19 hannes 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 "ethertype.h" 39 #include "extract.h" 40 #include "ppp.h" 41 #include "chdlc.h" 42 43 static void chdlc_slarp_print(const u_char *, u_int); 44 45 static const struct tok chdlc_cast_values[] = { 46 { CHDLC_UNICAST, "unicast" }, 47 { CHDLC_BCAST, "bcast" }, 48 { 0, NULL} 49 }; 50 51 52 /* Standard CHDLC printer */ 53 u_int 54 chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) 55 { 56 register u_int length = h->len; 57 register u_int caplen = h->caplen; 58 59 if (caplen < CHDLC_HDRLEN) { 60 printf("[|chdlc]"); 61 return (caplen); 62 } 63 return (chdlc_print(p,length)); 64 } 65 66 u_int 67 chdlc_print(register const u_char *p, u_int length) { 68 u_int proto; 69 70 proto = EXTRACT_16BITS(&p[2]); 71 if (eflag) { 72 printf("%s, ethertype %s (0x%04x), length %u: ", 73 tok2str(chdlc_cast_values, "0x%02x", p[0]), 74 tok2str(ethertype_values, "Unknown", proto), 75 proto, 76 length); 77 } 78 79 length -= CHDLC_HDRLEN; 80 p += CHDLC_HDRLEN; 81 82 switch (proto) { 83 case ETHERTYPE_IP: 84 ip_print(gndo, p, length); 85 break; 86 #ifdef INET6 87 case ETHERTYPE_IPV6: 88 ip6_print(gndo, p, length); 89 break; 90 #endif 91 case CHDLC_TYPE_SLARP: 92 chdlc_slarp_print(p, length); 93 break; 94 #if 0 95 case CHDLC_TYPE_CDP: 96 chdlc_cdp_print(p, length); 97 break; 98 #endif 99 case ETHERTYPE_MPLS: 100 case ETHERTYPE_MPLS_MULTI: 101 mpls_print(p, length); 102 break; 103 case ETHERTYPE_ISO: 104 /* is the fudge byte set ? lets verify by spotting ISO headers */ 105 if (*(p+1) == 0x81 || 106 *(p+1) == 0x82 || 107 *(p+1) == 0x83) 108 isoclns_print(p+1, length-1, length-1); 109 else 110 isoclns_print(p, length, length); 111 break; 112 default: 113 if (!eflag) 114 printf("unknown CHDLC protocol (0x%04x)", proto); 115 break; 116 } 117 118 return (CHDLC_HDRLEN); 119 } 120 121 /* 122 * The fixed-length portion of a SLARP packet. 123 */ 124 struct cisco_slarp { 125 u_int8_t code[4]; 126 #define SLARP_REQUEST 0 127 #define SLARP_REPLY 1 128 #define SLARP_KEEPALIVE 2 129 union { 130 struct { 131 u_int8_t addr[4]; 132 u_int8_t mask[4]; 133 } addr; 134 struct { 135 u_int8_t myseq[4]; 136 u_int8_t yourseq[4]; 137 u_int8_t rel[2]; 138 } keep; 139 } un; 140 }; 141 142 #define SLARP_MIN_LEN 14 143 #define SLARP_MAX_LEN 18 144 145 static void 146 chdlc_slarp_print(const u_char *cp, u_int length) 147 { 148 const struct cisco_slarp *slarp; 149 u_int sec,min,hrs,days; 150 151 printf("SLARP (length: %u), ",length); 152 if (length < SLARP_MIN_LEN) 153 goto trunc; 154 155 slarp = (const struct cisco_slarp *)cp; 156 TCHECK2(*slarp, SLARP_MIN_LEN); 157 switch (EXTRACT_32BITS(&slarp->code)) { 158 case SLARP_REQUEST: 159 printf("request"); 160 /* 161 * At least according to William "Chops" Westfield's 162 * message in 163 * 164 * http://www.nethelp.no/net/cisco-hdlc.txt 165 * 166 * the address and mask aren't used in requests - 167 * they're just zero. 168 */ 169 break; 170 case SLARP_REPLY: 171 printf("reply %s/%s", 172 ipaddr_string(&slarp->un.addr.addr), 173 ipaddr_string(&slarp->un.addr.mask)); 174 break; 175 case SLARP_KEEPALIVE: 176 printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x", 177 EXTRACT_32BITS(&slarp->un.keep.myseq), 178 EXTRACT_32BITS(&slarp->un.keep.yourseq), 179 EXTRACT_16BITS(&slarp->un.keep.rel)); 180 181 if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */ 182 cp += SLARP_MIN_LEN; 183 if (!TTEST2(*cp, 4)) 184 goto trunc; 185 sec = EXTRACT_32BITS(cp) / 1000; 186 min = sec / 60; sec -= min * 60; 187 hrs = min / 60; min -= hrs * 60; 188 days = hrs / 24; hrs -= days * 24; 189 printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec); 190 } 191 break; 192 default: 193 printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code)); 194 if (vflag <= 1) 195 print_unknown_data(cp+4,"\n\t",length-4); 196 break; 197 } 198 199 if (SLARP_MAX_LEN < length && vflag) 200 printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN); 201 if (vflag > 1) 202 print_unknown_data(cp+4,"\n\t",length-4); 203 return; 204 205 trunc: 206 printf("[|slarp]"); 207 } 208 209 210 /* 211 * Local Variables: 212 * c-style: whitesmith 213 * c-basic-offset: 8 214 * End: 215 */ 216
