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 #ifndef lint 22 static char rcsid[] = 23 "@(#) $Header: print-ether.c,v 1.42 96/07/23 14:17:23 leres Exp $ (LBL)"; 24 #endif 25 26 #include <sys/param.h> 27 #include <sys/time.h> 28 #include <sys/socket.h> 29 30 #if __STDC__ 31 struct mbuf; 32 struct rtentry; 33 #endif 34 #include <net/if.h> 35 36 #include <netinet/in.h> 37 #include <netinet/if_ether.h> 38 #include <netinet/in_systm.h> 39 #include <netinet/ip.h> 40 #include <netinet/ip_var.h> 41 #include <netinet/udp.h> 42 #include <netinet/udp_var.h> 43 #include <netinet/tcp.h> 44 #include <netinet/tcpip.h> 45 46 #include <stdio.h> 47 #include <pcap.h> 48 49 #include "interface.h" 50 #include "addrtoname.h" 51 #include "ethertype.h" 52 53 const u_char *packetp; 54 const u_char *snapend; 55 56 static inline void 57 ether_print(register const u_char *bp, u_int length) 58 { 59 register const struct ether_header *ep; 60 61 ep = (const struct ether_header *)bp; 62 if (qflag) 63 (void)printf("%s %s %d: ", 64 etheraddr_string(ESRC(ep)), 65 etheraddr_string(EDST(ep)), 66 length); 67 else 68 (void)printf("%s %s %s %d: ", 69 etheraddr_string(ESRC(ep)), 70 etheraddr_string(EDST(ep)), 71 etherproto_string(ep->ether_type), 72 length); 73 } 74 75 /* 76 * This is the top level routine of the printer. 'p' is the points 77 * to the ether header of the packet, 'tvp' is the timestamp, 78 * 'length' is the length of the packet off the wire, and 'caplen' 79 * is the number of bytes actually captured. 80 */ 81 void 82 ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 83 { 84 u_int caplen = h->caplen; 85 u_int length = h->len; 86 struct ether_header *ep; 87 u_short ether_type; 88 extern u_short extracted_ethertype; 89 90 ts_print(&h->ts); 91 92 if (caplen < sizeof(struct ether_header)) { 93 printf("[|ether]"); 94 goto out; 95 } 96 97 if (eflag) 98 ether_print(p, length); 99 100 /* 101 * Some printers want to get back at the ethernet addresses, 102 * and/or check that they're not walking off the end of the packet. 103 * Rather than pass them all the way down, we set these globals. 104 */ 105 packetp = p; 106 snapend = p + caplen; 107 108 length -= sizeof(struct ether_header); 109 caplen -= sizeof(struct ether_header); 110 ep = (struct ether_header *)p; 111 p += sizeof(struct ether_header); 112 113 ether_type = ntohs(ep->ether_type); 114 115 /* 116 * Is it (gag) an 802.3 encapsulation? 117 */ 118 extracted_ethertype = 0; 119 if (ether_type <= ETHERMTU) { 120 /* Try to print the LLC-layer header & higher layers */ 121 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep)) == 0) { 122 /* ether_type not known, print raw packet */ 123 if (!eflag) 124 ether_print((u_char *)ep, length); 125 if (extracted_ethertype) { 126 printf("(LLC %s) ", 127 etherproto_string(htons(extracted_ethertype))); 128 } 129 if (!xflag && !qflag) 130 default_print(p, caplen); 131 } 132 } else if (ether_encap_print(ether_type, p, length, caplen) == 0) { 133 /* ether_type not known, print raw packet */ 134 if (!eflag) 135 ether_print((u_char *)ep, length + sizeof(*ep)); 136 if (!xflag && !qflag) 137 default_print(p, caplen); 138 } 139 if (xflag) 140 default_print(p, caplen); 141 out: 142 putchar('\n'); 143 } 144 145 /* 146 * Prints the packet encapsulated in an Ethernet data segment 147 * (or an equivalent encapsulation), given the Ethernet type code. 148 * 149 * Returns non-zero if it can do so, zero if the ethertype is unknown. 150 * 151 * Stuffs the ether type into a global for the benefit of lower layers 152 * that might want to know what it is. 153 */ 154 155 u_short extracted_ethertype; 156 157 int 158 ether_encap_print(u_short ethertype, const u_char *p, 159 u_int length, u_int caplen) 160 { 161 extracted_ethertype = ethertype; 162 163 switch (ethertype) { 164 165 case ETHERTYPE_IP: 166 ip_print(p, length); 167 return (1); 168 169 case ETHERTYPE_ARP: 170 case ETHERTYPE_REVARP: 171 arp_print(p, length, caplen); 172 return (1); 173 174 case ETHERTYPE_DN: 175 decnet_print(p, length, caplen); 176 return (1); 177 178 case ETHERTYPE_ATALK: 179 if (vflag) 180 fputs("et1 ", stdout); 181 atalk_print(p, length); 182 return (1); 183 184 case ETHERTYPE_AARP: 185 aarp_print(p, length); 186 return (1); 187 188 case ETHERTYPE_IPX: 189 ipx_print(p, length); 190 return (1); 191 192 case ETHERTYPE_LAT: 193 case ETHERTYPE_SCA: 194 case ETHERTYPE_MOPRC: 195 case ETHERTYPE_MOPDL: 196 /* default_print for now */ 197 default: 198 return (0); 199 } 200 } 201