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 1.32.2.8 2005/08/23 10:29:42 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 /* Standard CHDLC printer */ 46 u_int 47 chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) 48 { 49 register u_int length = h->len; 50 register u_int caplen = h->caplen; 51 52 if (caplen < CHDLC_HDRLEN) { 53 printf("[|chdlc]"); 54 return (caplen); 55 } 56 return (chdlc_print(p,length)); 57 } 58 59 u_int 60 chdlc_print(register const u_char *p, u_int length) { 61 u_int proto; 62 const struct ip *ip; 63 64 proto = EXTRACT_16BITS(&p[2]); 65 if (eflag) { 66 switch (p[0]) { 67 case CHDLC_UNICAST: 68 printf("unicast "); 69 break; 70 case CHDLC_BCAST: 71 printf("bcast "); 72 break; 73 default: 74 printf("0x%02x ", p[0]); 75 break; 76 } 77 printf("%d %04x: ", length, proto); 78 } 79 80 length -= CHDLC_HDRLEN; 81 ip = (const struct ip *)(p + CHDLC_HDRLEN); 82 switch (proto) { 83 case ETHERTYPE_IP: 84 ip_print(gndo, (const u_char *)ip, length); 85 break; 86 #ifdef INET6 87 case ETHERTYPE_IPV6: 88 ip6_print((const u_char *)ip, length); 89 break; 90 #endif 91 case CHDLC_TYPE_SLARP: 92 chdlc_slarp_print((const u_char *)ip, length); 93 break; 94 #if 0 95 case CHDLC_TYPE_CDP: 96 chdlc_cdp_print((const u_char *)ip, length); 97 break; 98 #endif 99 case ETHERTYPE_MPLS: 100 case ETHERTYPE_MPLS_MULTI: 101 mpls_print((const u_char *)(ip), length); 102 break; 103 case ETHERTYPE_ISO: 104 /* is the fudge byte set ? lets verify by spotting ISO headers */ 105 if (*(p+CHDLC_HDRLEN+1) == 0x81 || 106 *(p+CHDLC_HDRLEN+1) == 0x82 || 107 *(p+CHDLC_HDRLEN+1) == 0x83) 108 isoclns_print(p+CHDLC_HDRLEN+1, length-1, length-1); 109 else 110 isoclns_print(p+CHDLC_HDRLEN, length, length); 111 break; 112 default: 113 printf("unknown CHDLC protocol (0x%04x)", proto); 114 break; 115 } 116 117 return (CHDLC_HDRLEN); 118 } 119 120 /* 121 * The fixed-length portion of a SLARP packet. 122 */ 123 struct cisco_slarp { 124 u_int8_t code[4]; 125 #define SLARP_REQUEST 0 126 #define SLARP_REPLY 1 127 #define SLARP_KEEPALIVE 2 128 union { 129 struct { 130 u_int8_t addr[4]; 131 u_int8_t mask[4]; 132 } addr; 133 struct { 134 u_int8_t myseq[4]; 135 u_int8_t yourseq[4]; 136 u_int8_t rel[2]; 137 } keep; 138 } un; 139 }; 140 141 #define SLARP_MIN_LEN 14 142 #define SLARP_MAX_LEN 18 143 144 static void 145 chdlc_slarp_print(const u_char *cp, u_int length) 146 { 147 const struct cisco_slarp *slarp; 148 u_int sec,min,hrs,days; 149 150 printf("SLARP (length: %u), ",length); 151 if (length < SLARP_MIN_LEN) 152 goto trunc; 153 154 slarp = (const struct cisco_slarp *)cp; 155 TCHECK2(*slarp, SLARP_MIN_LEN); 156 switch (EXTRACT_32BITS(&slarp->code)) { 157 case SLARP_REQUEST: 158 printf("request"); 159 /* 160 * At least according to William "Chops" Westfield's 161 * message in 162 * 163 * http://www.nethelp.no/net/cisco-hdlc.txt 164 * 165 * the address and mask aren't used in requests - 166 * they're just zero. 167 */ 168 break; 169 case SLARP_REPLY: 170 printf("reply %s/%s", 171 ipaddr_string(&slarp->un.addr.addr), 172 ipaddr_string(&slarp->un.addr.mask)); 173 break; 174 case SLARP_KEEPALIVE: 175 printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x", 176 EXTRACT_32BITS(&slarp->un.keep.myseq), 177 EXTRACT_32BITS(&slarp->un.keep.yourseq), 178 EXTRACT_16BITS(&slarp->un.keep.rel)); 179 180 if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */ 181 cp += SLARP_MIN_LEN; 182 if (!TTEST2(*cp, 4)) 183 goto trunc; 184 sec = EXTRACT_32BITS(cp) / 1000; 185 min = sec / 60; sec -= min * 60; 186 hrs = min / 60; min -= hrs * 60; 187 days = hrs / 24; hrs -= days * 24; 188 printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec); 189 } 190 break; 191 default: 192 printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code)); 193 if (vflag <= 1) 194 print_unknown_data(cp+4,"\n\t",length-4); 195 break; 196 } 197 198 if (SLARP_MAX_LEN < length && vflag) 199 printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN); 200 if (vflag > 1) 201 print_unknown_data(cp+4,"\n\t",length-4); 202 return; 203 204 trunc: 205 printf("[|slarp]"); 206 } 207 208 209 /* 210 * Local Variables: 211 * c-style: whitesmith 212 * c-basic-offset: 8 213 * End: 214 */ 215