156893Sfenner/* 256893Sfenner * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 356893Sfenner * The Regents of the University of California. All rights reserved. 456893Sfenner * 556893Sfenner * Redistribution and use in source and binary forms, with or without 656893Sfenner * modification, are permitted provided that: (1) source code distributions 756893Sfenner * retain the above copyright notice and this paragraph in its entirety, (2) 856893Sfenner * distributions including binary code include the above copyright notice and 956893Sfenner * this paragraph in its entirety in the documentation or other materials 1056893Sfenner * provided with the distribution, and (3) all advertising materials mentioning 1156893Sfenner * features or use of this software display the following acknowledgement: 1256893Sfenner * ``This product includes software developed by the University of California, 1356893Sfenner * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 1456893Sfenner * the University nor the names of its contributors may be used to endorse 1556893Sfenner * or promote products derived from this software without specific prior 1656893Sfenner * written permission. 1756893Sfenner * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 1856893Sfenner * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 1956893Sfenner * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 2056893Sfenner */ 2156893Sfenner 2256893Sfenner#ifndef lint 23127668Sbmsstatic const char rcsid[] _U_ = 24190207Srpaulo "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.43 2005-11-29 08:56:19 hannes Exp $ (LBL)"; 2556893Sfenner#endif 2656893Sfenner 2756893Sfenner#ifdef HAVE_CONFIG_H 2856893Sfenner#include "config.h" 2956893Sfenner#endif 3056893Sfenner 31127668Sbms#include <tcpdump-stdinc.h> 3256893Sfenner 3356893Sfenner#include <pcap.h> 3456893Sfenner#include <stdio.h> 3556893Sfenner 3656893Sfenner#include "interface.h" 3756893Sfenner#include "addrtoname.h" 3875115Sfenner#include "ethertype.h" 3998524Sfenner#include "extract.h" 4056893Sfenner#include "ppp.h" 4175115Sfenner#include "chdlc.h" 4256893Sfenner 4356893Sfennerstatic void chdlc_slarp_print(const u_char *, u_int); 4456893Sfenner 45172683Smlaierconst struct tok chdlc_cast_values[] = { 46172683Smlaier { CHDLC_UNICAST, "unicast" }, 47172683Smlaier { CHDLC_BCAST, "bcast" }, 48172683Smlaier { 0, NULL} 49172683Smlaier}; 50172683Smlaier 51172683Smlaier 5256893Sfenner/* Standard CHDLC printer */ 53127668Sbmsu_int 54127668Sbmschdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) 5556893Sfenner{ 5656893Sfenner register u_int length = h->len; 5756893Sfenner register u_int caplen = h->caplen; 5898524Sfenner 5998524Sfenner if (caplen < CHDLC_HDRLEN) { 6098524Sfenner printf("[|chdlc]"); 61127668Sbms return (caplen); 6298524Sfenner } 63162017Ssam return (chdlc_print(p,length)); 64162017Ssam} 6598524Sfenner 66162017Ssamu_int 67162017Ssamchdlc_print(register const u_char *p, u_int length) { 68162017Ssam u_int proto; 69162017Ssam 7098524Sfenner proto = EXTRACT_16BITS(&p[2]); 7156893Sfenner if (eflag) { 72172683Smlaier printf("%s, ethertype %s (0x%04x), length %u: ", 73172683Smlaier tok2str(chdlc_cast_values, "0x%02x", p[0]), 74172683Smlaier tok2str(ethertype_values, "Unknown", proto), 75172683Smlaier proto, 76172683Smlaier length); 7756893Sfenner } 7856893Sfenner 7956893Sfenner length -= CHDLC_HDRLEN; 80172683Smlaier p += CHDLC_HDRLEN; 81172683Smlaier 8275115Sfenner switch (proto) { 8356893Sfenner case ETHERTYPE_IP: 84172683Smlaier ip_print(gndo, p, length); 8556893Sfenner break; 8656893Sfenner#ifdef INET6 8756893Sfenner case ETHERTYPE_IPV6: 88236192Sdelphij ip6_print(gndo, p, length); 8956893Sfenner break; 9056893Sfenner#endif 9156893Sfenner case CHDLC_TYPE_SLARP: 92172683Smlaier chdlc_slarp_print(p, length); 9356893Sfenner break; 9456893Sfenner#if 0 9556893Sfenner case CHDLC_TYPE_CDP: 96172683Smlaier chdlc_cdp_print(p, length); 9756893Sfenner break; 9856893Sfenner#endif 99127668Sbms case ETHERTYPE_MPLS: 100127668Sbms case ETHERTYPE_MPLS_MULTI: 101172683Smlaier mpls_print(p, length); 102127668Sbms break; 103127668Sbms case ETHERTYPE_ISO: 104127668Sbms /* is the fudge byte set ? lets verify by spotting ISO headers */ 105172683Smlaier if (*(p+1) == 0x81 || 106172683Smlaier *(p+1) == 0x82 || 107172683Smlaier *(p+1) == 0x83) 108172683Smlaier isoclns_print(p+1, length-1, length-1); 109127668Sbms else 110172683Smlaier isoclns_print(p, length, length); 111127668Sbms break; 112127668Sbms default: 113172683Smlaier if (!eflag) 114172683Smlaier printf("unknown CHDLC protocol (0x%04x)", proto); 115127668Sbms break; 11656893Sfenner } 117127668Sbms 118127668Sbms return (CHDLC_HDRLEN); 11956893Sfenner} 12056893Sfenner 121147899Ssam/* 122147899Ssam * The fixed-length portion of a SLARP packet. 123147899Ssam */ 12456893Sfennerstruct cisco_slarp { 125147899Ssam u_int8_t code[4]; 12656893Sfenner#define SLARP_REQUEST 0 12756893Sfenner#define SLARP_REPLY 1 12856893Sfenner#define SLARP_KEEPALIVE 2 12956893Sfenner union { 13056893Sfenner struct { 131147899Ssam u_int8_t addr[4]; 132147899Ssam u_int8_t mask[4]; 13356893Sfenner } addr; 13456893Sfenner struct { 135147899Ssam u_int8_t myseq[4]; 136147899Ssam u_int8_t yourseq[4]; 137147899Ssam u_int8_t rel[2]; 13856893Sfenner } keep; 13956893Sfenner } un; 14056893Sfenner}; 14156893Sfenner 142147899Ssam#define SLARP_MIN_LEN 14 143147899Ssam#define SLARP_MAX_LEN 18 14456893Sfenner 14556893Sfennerstatic void 14656893Sfennerchdlc_slarp_print(const u_char *cp, u_int length) 14756893Sfenner{ 14898524Sfenner const struct cisco_slarp *slarp; 149147899Ssam u_int sec,min,hrs,days; 15056893Sfenner 151147899Ssam printf("SLARP (length: %u), ",length); 152147899Ssam if (length < SLARP_MIN_LEN) 153127668Sbms goto trunc; 15456893Sfenner 15598524Sfenner slarp = (const struct cisco_slarp *)cp; 156147899Ssam TCHECK2(*slarp, SLARP_MIN_LEN); 157127668Sbms switch (EXTRACT_32BITS(&slarp->code)) { 15856893Sfenner case SLARP_REQUEST: 159127668Sbms printf("request"); 160147899Ssam /* 161147899Ssam * At least according to William "Chops" Westfield's 162147899Ssam * message in 163147899Ssam * 164147899Ssam * http://www.nethelp.no/net/cisco-hdlc.txt 165147899Ssam * 166147899Ssam * the address and mask aren't used in requests - 167147899Ssam * they're just zero. 168147899Ssam */ 16956893Sfenner break; 17056893Sfenner case SLARP_REPLY: 171127668Sbms printf("reply %s/%s", 17256893Sfenner ipaddr_string(&slarp->un.addr.addr), 17356893Sfenner ipaddr_string(&slarp->un.addr.mask)); 17456893Sfenner break; 17556893Sfenner case SLARP_KEEPALIVE: 176147899Ssam printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x", 177147899Ssam EXTRACT_32BITS(&slarp->un.keep.myseq), 178147899Ssam EXTRACT_32BITS(&slarp->un.keep.yourseq), 179147899Ssam EXTRACT_16BITS(&slarp->un.keep.rel)); 180147899Ssam 181147899Ssam if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */ 182147899Ssam cp += SLARP_MIN_LEN; 183147899Ssam if (!TTEST2(*cp, 4)) 184147899Ssam goto trunc; 185147899Ssam sec = EXTRACT_32BITS(cp) / 1000; 186147899Ssam min = sec / 60; sec -= min * 60; 187147899Ssam hrs = min / 60; min -= hrs * 60; 188147899Ssam days = hrs / 24; hrs -= days * 24; 189147899Ssam printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec); 190147899Ssam } 19156893Sfenner break; 19256893Sfenner default: 193127668Sbms printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code)); 194127668Sbms if (vflag <= 1) 195127668Sbms print_unknown_data(cp+4,"\n\t",length-4); 19656893Sfenner break; 19756893Sfenner } 19856893Sfenner 199147899Ssam if (SLARP_MAX_LEN < length && vflag) 200147899Ssam printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN); 201127668Sbms if (vflag > 1) 202127668Sbms print_unknown_data(cp+4,"\n\t",length-4); 203127668Sbms return; 204127668Sbms 205127668Sbmstrunc: 206127668Sbms printf("[|slarp]"); 20756893Sfenner} 208146773Ssam 209146773Ssam 210146773Ssam/* 211146773Ssam * Local Variables: 212146773Ssam * c-style: whitesmith 213146773Ssam * c-basic-offset: 8 214146773Ssam * End: 215146773Ssam */ 216