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 #include <sys/cdefs.h> 23 #ifndef lint 24 #if 0 25 static const char rcsid[] _U_ = 26 "@(#) Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.43 2005-11-29 08:56:19 hannes Exp (LBL)"; 27 #else 28 __RCSID("$NetBSD: print-chdlc.c,v 1.4 2013/12/31 17:33:31 christos Exp $"); 29 #endif 30 #endif 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <tcpdump-stdinc.h> 37 38 #include <pcap.h> 39 #include <stdio.h> 40 41 #include "interface.h" 42 #include "addrtoname.h" 43 #include "ethertype.h" 44 #include "extract.h" 45 #include "ppp.h" 46 #include "chdlc.h" 47 48 static void chdlc_slarp_print(const u_char *, u_int); 49 50 static const struct tok chdlc_cast_values[] = { 51 { CHDLC_UNICAST, "unicast" }, 52 { CHDLC_BCAST, "bcast" }, 53 { 0, NULL} 54 }; 55 56 57 /* Standard CHDLC printer */ 58 u_int 59 chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) 60 { 61 register u_int length = h->len; 62 register u_int caplen = h->caplen; 63 64 if (caplen < CHDLC_HDRLEN) { 65 printf("[|chdlc]"); 66 return (caplen); 67 } 68 return (chdlc_print(p,length)); 69 } 70 71 u_int 72 chdlc_print(register const u_char *p, u_int length) { 73 u_int proto; 74 75 proto = EXTRACT_16BITS(&p[2]); 76 if (eflag) { 77 printf("%s, ethertype %s (0x%04x), length %u: ", 78 tok2str(chdlc_cast_values, "0x%02x", p[0]), 79 tok2str(ethertype_values, "Unknown", proto), 80 proto, 81 length); 82 } 83 84 length -= CHDLC_HDRLEN; 85 p += CHDLC_HDRLEN; 86 87 switch (proto) { 88 case ETHERTYPE_IP: 89 ip_print(gndo, p, length); 90 break; 91 #ifdef INET6 92 case ETHERTYPE_IPV6: 93 ip6_print(gndo, p, length); 94 break; 95 #endif 96 case CHDLC_TYPE_SLARP: 97 chdlc_slarp_print(p, length); 98 break; 99 #if 0 100 case CHDLC_TYPE_CDP: 101 chdlc_cdp_print(p, length); 102 break; 103 #endif 104 case ETHERTYPE_MPLS: 105 case ETHERTYPE_MPLS_MULTI: 106 mpls_print(p, length); 107 break; 108 case ETHERTYPE_ISO: 109 /* is the fudge byte set ? lets verify by spotting ISO headers */ 110 if (*(p+1) == 0x81 || 111 *(p+1) == 0x82 || 112 *(p+1) == 0x83) 113 isoclns_print(p+1, length-1, length-1); 114 else 115 isoclns_print(p, length, length); 116 break; 117 default: 118 if (!eflag) 119 printf("unknown CHDLC protocol (0x%04x)", proto); 120 break; 121 } 122 123 return (CHDLC_HDRLEN); 124 } 125 126 /* 127 * The fixed-length portion of a SLARP packet. 128 */ 129 struct cisco_slarp { 130 u_int8_t code[4]; 131 #define SLARP_REQUEST 0 132 #define SLARP_REPLY 1 133 #define SLARP_KEEPALIVE 2 134 union { 135 struct { 136 u_int8_t addr[4]; 137 u_int8_t mask[4]; 138 } addr; 139 struct { 140 u_int8_t myseq[4]; 141 u_int8_t yourseq[4]; 142 u_int8_t rel[2]; 143 } keep; 144 } un; 145 }; 146 147 #define SLARP_MIN_LEN 14 148 #define SLARP_MAX_LEN 18 149 150 static void 151 chdlc_slarp_print(const u_char *cp, u_int length) 152 { 153 const struct cisco_slarp *slarp; 154 u_int sec,min,hrs,days; 155 156 printf("SLARP (length: %u), ",length); 157 if (length < SLARP_MIN_LEN) 158 goto trunc; 159 160 slarp = (const struct cisco_slarp *)cp; 161 TCHECK2(*slarp, SLARP_MIN_LEN); 162 switch (EXTRACT_32BITS(&slarp->code)) { 163 case SLARP_REQUEST: 164 printf("request"); 165 /* 166 * At least according to William "Chops" Westfield's 167 * message in 168 * 169 * http://www.nethelp.no/net/cisco-hdlc.txt 170 * 171 * the address and mask aren't used in requests - 172 * they're just zero. 173 */ 174 break; 175 case SLARP_REPLY: 176 printf("reply %s/%s", 177 ipaddr_string(&slarp->un.addr.addr), 178 ipaddr_string(&slarp->un.addr.mask)); 179 break; 180 case SLARP_KEEPALIVE: 181 printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x", 182 EXTRACT_32BITS(&slarp->un.keep.myseq), 183 EXTRACT_32BITS(&slarp->un.keep.yourseq), 184 EXTRACT_16BITS(&slarp->un.keep.rel)); 185 186 if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */ 187 cp += SLARP_MIN_LEN; 188 if (!TTEST2(*cp, 4)) 189 goto trunc; 190 sec = EXTRACT_32BITS(cp) / 1000; 191 min = sec / 60; sec -= min * 60; 192 hrs = min / 60; min -= hrs * 60; 193 days = hrs / 24; hrs -= days * 24; 194 printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec); 195 } 196 break; 197 default: 198 printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code)); 199 if (vflag <= 1) 200 print_unknown_data(cp+4,"\n\t",length-4); 201 break; 202 } 203 204 if (SLARP_MAX_LEN < length && vflag) 205 printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN); 206 if (vflag > 1) 207 print_unknown_data(cp+4,"\n\t",length-4); 208 return; 209 210 trunc: 211 printf("[|slarp]"); 212 } 213 214 215 /* 216 * Local Variables: 217 * c-style: whitesmith 218 * c-basic-offset: 8 219 * End: 220 */ 221