1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996 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 * Hacked version of print-ether.c Larry Lile <lile@stdio.com> 22 * 23 * Further tweaked to more closely resemble print-fddi.c 24 * Guy Harris <guy@alum.mit.edu> 25 * 26 * $FreeBSD$ 27 */ 28 #ifndef lint 29 static const char rcsid[] _U_ = 30 "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.27 2005-11-13 12:12:43 guy Exp $"; 31 #endif 32 33 #ifdef HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 37 #include <tcpdump-stdinc.h> 38 39 #include <pcap.h> 40 #include <stdio.h> 41 #include <string.h> 42 43 #include "interface.h" 44 #include "extract.h" 45 #include "addrtoname.h" 46 #include "ethertype.h" 47 48 #include "ether.h" 49 #include "token.h" 50 51 /* Extract src, dst addresses */ 52 static inline void 53 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst) 54 { 55 memcpy(fdst, (const char *)trp->token_dhost, 6); 56 memcpy(fsrc, (const char *)trp->token_shost, 6); 57 } 58 59 /* 60 * Print the TR MAC header 61 */ 62 static inline void 63 token_hdr_print(register const struct token_header *trp, register u_int length, 64 register const u_char *fsrc, register const u_char *fdst) 65 { 66 const char *srcname, *dstname; 67 68 srcname = etheraddr_string(fsrc); 69 dstname = etheraddr_string(fdst); 70 71 if (vflag) 72 (void) printf("%02x %02x %s %s %d: ", 73 trp->token_ac, 74 trp->token_fc, 75 srcname, dstname, 76 length); 77 else 78 printf("%s %s %d: ", srcname, dstname, length); 79 } 80 81 static const char *broadcast_indicator[] = { 82 "Non-Broadcast", "Non-Broadcast", 83 "Non-Broadcast", "Non-Broadcast", 84 "All-routes", "All-routes", 85 "Single-route", "Single-route" 86 }; 87 88 static const char *direction[] = { 89 "Forward", "Backward" 90 }; 91 92 static const char *largest_frame[] = { 93 "516", 94 "1500", 95 "2052", 96 "4472", 97 "8144", 98 "11407", 99 "17800", 100 "??" 101 }; 102 103 u_int 104 token_print(const u_char *p, u_int length, u_int caplen) 105 { 106 const struct token_header *trp; 107 u_short extracted_ethertype; 108 struct ether_header ehdr; 109 u_int route_len = 0, hdr_len = TOKEN_HDRLEN; 110 int seg; 111 112 trp = (const struct token_header *)p; 113 114 if (caplen < TOKEN_HDRLEN) { 115 printf("[|token-ring]"); 116 return hdr_len; 117 } 118 119 /* 120 * Get the TR addresses into a canonical form 121 */ 122 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr)); 123 124 /* Adjust for source routing information in the MAC header */ 125 if (IS_SOURCE_ROUTED(trp)) { 126 /* Clear source-routed bit */ 127 *ESRC(&ehdr) &= 0x7f; 128 129 if (eflag) 130 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); 131 132 if (caplen < TOKEN_HDRLEN + 2) { 133 printf("[|token-ring]"); 134 return hdr_len; 135 } 136 route_len = RIF_LENGTH(trp); 137 hdr_len += route_len; 138 if (caplen < hdr_len) { 139 printf("[|token-ring]"); 140 return hdr_len; 141 } 142 if (vflag) { 143 printf("%s ", broadcast_indicator[BROADCAST(trp)]); 144 printf("%s", direction[DIRECTION(trp)]); 145 146 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 147 printf(" [%d:%d]", RING_NUMBER(trp, seg), 148 BRIDGE_NUMBER(trp, seg)); 149 } else { 150 printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf)); 151 152 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 153 printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg])); 154 } 155 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); 156 } else { 157 if (eflag) 158 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); 159 } 160 161 /* Skip over token ring MAC header and routing information */ 162 length -= hdr_len; 163 p += hdr_len; 164 caplen -= hdr_len; 165 166 /* Frame Control field determines interpretation of packet */ 167 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) { 168 /* Try to print the LLC-layer header & higher layers */ 169 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr), 170 &extracted_ethertype) == 0) { 171 /* ether_type not known, print raw packet */ 172 if (!eflag) 173 token_hdr_print(trp, 174 length + TOKEN_HDRLEN + route_len, 175 ESRC(&ehdr), EDST(&ehdr)); 176 if (extracted_ethertype) { 177 printf("(LLC %s) ", 178 etherproto_string(htons(extracted_ethertype))); 179 } 180 if (!suppress_default_print) 181 default_print(p, caplen); 182 } 183 } else { 184 /* Some kinds of TR packet we cannot handle intelligently */ 185 /* XXX - dissect MAC packets if frame type is 0 */ 186 if (!eflag) 187 token_hdr_print(trp, length + TOKEN_HDRLEN + route_len, 188 ESRC(&ehdr), EDST(&ehdr)); 189 if (!suppress_default_print) 190 default_print(p, caplen); 191 } 192 return (hdr_len); 193 } 194 195 /* 196 * This is the top level routine of the printer. 'p' points 197 * to the TR header of the packet, 'h->ts' is the timestamp, 198 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 199 * is the number of bytes actually captured. 200 */ 201 u_int 202 token_if_print(const struct pcap_pkthdr *h, const u_char *p) 203 { 204 return (token_print(p, h->len, h->caplen)); 205 } 206