1 /* maybe it should be merged into print-ppp.c */ 2 /* 3 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that: (1) source code distributions 8 * retain the above copyright notice and this paragraph in its entirety, (2) 9 * distributions including binary code include the above copyright notice and 10 * this paragraph in its entirety in the documentation or other materials 11 * provided with the distribution, and (3) all advertising materials mentioning 12 * features or use of this software display the following acknowledgement: 13 * ``This product includes software developed by the University of California, 14 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 15 * the University nor the names of its contributors may be used to endorse 16 * or promote products derived from this software without specific prior 17 * written permission. 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 19 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 21 */ 22 23 #ifndef lint 24 static const char rcsid[] = 25 "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.2 1999/11/21 09:36:49 fenner Exp $ (LBL)"; 26 #endif 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <sys/param.h> 33 #include <sys/time.h> 34 #include <sys/socket.h> 35 #include <sys/file.h> 36 #include <sys/ioctl.h> 37 38 #if __STDC__ 39 struct mbuf; 40 struct rtentry; 41 #endif 42 #include <net/if.h> 43 44 #include <netinet/in.h> 45 #include <netinet/in_systm.h> 46 #include <netinet/ip.h> 47 #include <netinet/if_ether.h> 48 49 #include <ctype.h> 50 #include <netdb.h> 51 #include <pcap.h> 52 #include <stdio.h> 53 #ifdef __bsdi__ 54 #include <net/slcompress.h> 55 #include <net/if_ppp.h> 56 #endif 57 58 #include "interface.h" 59 #include "addrtoname.h" 60 #include "ppp.h" 61 62 /* XXX This goes somewhere else. */ 63 #define CHDLC_HDRLEN 4 64 #define CHDLC_UNICAST 0x0f 65 #define CHDLC_BCAST 0x8f 66 #define CHDLC_TYPE_SLARP 0x8035 67 #define CHDLC_TYPE_CDP 0x2000 68 69 static void chdlc_slarp_print(const u_char *, u_int); 70 71 /* Standard CHDLC printer */ 72 void 73 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h, 74 register const u_char *p) 75 { 76 register u_int length = h->len; 77 register u_int caplen = h->caplen; 78 const struct ip *ip; 79 u_int proto; 80 81 ts_print(&h->ts); 82 83 if (caplen < CHDLC_HDRLEN) { 84 printf("[|chdlc]"); 85 goto out; 86 } 87 88 /* 89 * Some printers want to get back at the link level addresses, 90 * and/or check that they're not walking off the end of the packet. 91 * Rather than pass them all the way down, we set these globals. 92 */ 93 proto = ntohs(*(u_short *)&p[2]); 94 packetp = p; 95 snapend = p + caplen; 96 97 if (eflag) { 98 switch (p[0]) { 99 case CHDLC_UNICAST: 100 printf("unicast "); 101 break; 102 case CHDLC_BCAST: 103 printf("bcast "); 104 break; 105 default: 106 printf("0x%02x ", p[0]); 107 break; 108 } 109 printf("%d %04x: ", length, proto); 110 } 111 112 length -= CHDLC_HDRLEN; 113 ip = (struct ip *)(p + CHDLC_HDRLEN); 114 switch(proto) { 115 case ETHERTYPE_IP: 116 ip_print((const u_char *)ip, length); 117 break; 118 #ifdef INET6 119 case ETHERTYPE_IPV6: 120 ip6_print((const u_char *)ip, length); 121 break; 122 #endif 123 case CHDLC_TYPE_SLARP: 124 chdlc_slarp_print((const u_char *)ip, length); 125 break; 126 #if 0 127 case CHDLC_TYPE_CDP: 128 chdlc_cdp_print((const u_char *)ip, length); 129 break; 130 #endif 131 } 132 if (xflag) 133 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN); 134 out: 135 putchar('\n'); 136 } 137 138 struct cisco_slarp { 139 long code; 140 #define SLARP_REQUEST 0 141 #define SLARP_REPLY 1 142 #define SLARP_KEEPALIVE 2 143 union { 144 struct { 145 struct in_addr addr; 146 struct in_addr mask; 147 u_short unused[3]; 148 } addr; 149 struct { 150 long myseq; 151 long yourseq; 152 short rel; 153 short t1; 154 short t2; 155 } keep; 156 } un; 157 }; 158 159 #define SLARP_LEN 18 160 161 static void 162 chdlc_slarp_print(const u_char *cp, u_int length) 163 { 164 struct cisco_slarp *slarp; 165 166 if (length < SLARP_LEN) { 167 printf("[|slarp]"); 168 return; 169 } 170 171 slarp = (struct cisco_slarp *)cp; 172 switch (ntohl(slarp->code)) { 173 case SLARP_REQUEST: 174 printf("slarp-request"); 175 break; 176 case SLARP_REPLY: 177 printf("slarp-reply %s/%s", 178 ipaddr_string(&slarp->un.addr.addr), 179 ipaddr_string(&slarp->un.addr.mask)); 180 break; 181 case SLARP_KEEPALIVE: 182 printf("slarp-keepalive my=0x%x your=0x%x ", 183 (u_int32_t)ntohl(slarp->un.keep.myseq), 184 (u_int32_t)ntohl(slarp->un.keep.yourseq)); 185 printf("reliability=0x%04x t1=%d.%d", 186 ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1), 187 ntohs(slarp->un.keep.t2)); 188 break; 189 default: 190 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code)); 191 break; 192 } 193 194 if (SLARP_LEN < length && vflag) 195 printf("(trailing junk: %d bytes)", length - SLARP_LEN); 196 } 197