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 #ifndef lint 24 static const char rcsid[] = 25 "@(#) $Header$"; 26 #endif 27 28 #include <sys/param.h> 29 #include <sys/time.h> 30 #include <sys/socket.h> 31 32 #if __STDC__ 33 struct mbuf; 34 struct rtentry; 35 #endif 36 #include <net/if.h> 37 38 #include "token.h" 39 40 #include <netinet/in.h> 41 #include <net/ethernet.h> 42 #include <netinet/in_systm.h> 43 #include <netinet/ip.h> 44 #include <netinet/ip_var.h> 45 #include <netinet/udp.h> 46 #include <netinet/udp_var.h> 47 #include <netinet/tcp.h> 48 #include <netinet/tcpip.h> 49 50 #include <stdio.h> 51 #include <pcap.h> 52 53 #include "interface.h" 54 #include "addrtoname.h" 55 #include "ethertype.h" 56 #include "llc.h" 57 58 const u_char *packetp; 59 const u_char *snapend; 60 61 static inline void 62 token_print(register const u_char *bp, u_int length) 63 { 64 register const struct token_header *tp; 65 register const struct llc *lp; 66 u_short ether_type; 67 68 tp = (const struct token_header *)bp; 69 lp = (struct llc *)(bp + TOKEN_HDR_LEN); 70 if (IS_SOURCE_ROUTED) 71 lp = (struct llc *)(bp + TOKEN_HDR_LEN + RIF_LENGTH); 72 73 /* 74 * Ethertype on ethernet is a short, but ethertype in an llc-snap has 75 * been defined as 2 u_chars. This is a stupid little hack to fix 76 * this for now but something better should be done using ntohs() 77 * XXX 78 */ 79 ether_type = ((u_short)lp->ethertype[1] << 16) | lp->ethertype[0]; 80 81 if (qflag) 82 (void)printf("%s %s %d: ", 83 etheraddr_string(ESRC(tp)), 84 etheraddr_string(EDST(tp)), 85 length); 86 else 87 (void)printf("%s %s %s %d: ", 88 etheraddr_string(ESRC(tp)), 89 etheraddr_string(EDST(tp)), 90 etherproto_string(ether_type), 91 length); 92 } 93 94 /* 95 * This is the top level routine of the printer. 'p' is the points 96 * to the ether header of the packet, 'tvp' is the timestamp, 97 * 'length' is the length of the packet off the wire, and 'caplen' 98 * is the number of bytes actually captured. 99 */ 100 void 101 token_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 102 { 103 u_int caplen = h->caplen; 104 u_int length = h->len; 105 struct token_header *tp; 106 u_short ether_type; 107 extern u_short extracted_ethertype; 108 u_int route_len = 0; 109 struct llc *lp; 110 111 tp = (struct token_header *)p; 112 113 ts_print(&h->ts); 114 115 if (caplen < TOKEN_HDR_LEN) { 116 printf("[|token-ring]"); 117 goto out; 118 } 119 120 if (eflag) 121 token_print(p, length); 122 123 /* 124 * Some printers want to get back at the ethernet addresses, 125 * and/or check that they're not walking off the end of the packet. 126 * Rather than pass them all the way down, we set these globals. 127 */ 128 tp = (struct token_header *)p; 129 130 /* Adjust for source routing information in the MAC header */ 131 if (IS_SOURCE_ROUTED) { 132 route_len = RIF_LENGTH; 133 } 134 135 /* Set pointer to llc header, adjusted for routing information */ 136 lp = (struct llc *)(p + TOKEN_HDR_LEN + route_len); 137 138 packetp = p; 139 snapend = p + caplen; 140 141 /* Skip over token ring MAC header */ 142 length -= TOKEN_HDR_LEN + route_len; 143 caplen -= TOKEN_HDR_LEN + route_len; 144 p += TOKEN_HDR_LEN + route_len; 145 146 ether_type = ntohs((int)lp->ethertype); 147 148 extracted_ethertype = 0; 149 /* Try to print the LLC-layer header & higher layers */ 150 if (llc_print(p, length, caplen, ESRC(tp), EDST(tp)) == 0) { 151 /* ether_type not known, print raw packet */ 152 if (!eflag) 153 token_print((u_char *)tp, length); 154 if (extracted_ethertype) { 155 printf("(LLC %s) ", 156 etherproto_string(htons(extracted_ethertype))); 157 } 158 if (!xflag && !qflag) 159 default_print(p, caplen); 160 } 161 if (xflag) 162 default_print(p, caplen); 163 out: 164 putchar('\n'); 165 } 166