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