1 /* $OpenBSD: print-null.c,v 1.14 2001/06/25 19:53:54 provos Exp $ */ 2 3 /* 4 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 */ 23 24 #ifndef lint 25 static const char rcsid[] = 26 "@(#) $Header: /home/cvs/src/usr.sbin/tcpdump/print-null.c,v 1.14 2001/06/25 19:53:54 provos Exp $ (LBL)"; 27 #endif 28 29 #include <sys/param.h> 30 #include <sys/time.h> 31 #include <sys/socket.h> 32 #include <sys/file.h> 33 #include <sys/ioctl.h> 34 35 #ifdef __STDC__ 36 struct mbuf; 37 struct rtentry; 38 #endif 39 #include <net/if.h> 40 41 #include <netinet/in.h> 42 #include <netinet/in_systm.h> 43 #include <netinet/ip.h> 44 #include <netinet/if_ether.h> 45 #include <netinet/ip_var.h> 46 #include <netinet/udp.h> 47 #include <netinet/udp_var.h> 48 #include <netinet/tcp.h> 49 50 #include <pcap.h> 51 #include <stdio.h> 52 #include <string.h> 53 54 #ifdef INET6 55 #include <netinet/ip6.h> 56 #endif 57 58 #include "interface.h" 59 #include "addrtoname.h" 60 61 #ifndef AF_NS 62 #define AF_NS 6 /* XEROX NS protocols */ 63 #endif 64 65 /* 66 * The DLT_NULL packet header is 4 bytes long. It contains a network 67 * order 32 bit integer that specifies the family, e.g. AF_INET 68 */ 69 #define NULL_HDRLEN 4 70 71 static void 72 null_print(const u_char *p, const struct ip *ip, u_int length) 73 { 74 u_int family; 75 76 memcpy((char *)&family, (char *)p, sizeof(family)); 77 family = ntohl(family); 78 79 if (nflag && family != AF_LINK) { 80 /* XXX just dump the header */ 81 return; 82 } 83 switch (family) { 84 85 case AF_INET: 86 printf("ip: "); 87 break; 88 89 #ifdef INET6 90 case AF_INET6: 91 printf("ip6: "); 92 break; 93 #endif 94 95 case AF_NS: 96 printf("ns: "); 97 break; 98 99 #ifdef __OpenBSD__ 100 case AF_LINK: 101 ether_print(p + NULL_HDRLEN, length); 102 break; 103 #endif 104 105 default: 106 printf("AF %d: ", family); 107 break; 108 } 109 } 110 111 void 112 null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 113 { 114 u_int length = h->len; 115 u_int caplen = h->caplen; 116 u_int family; 117 118 #ifdef __OpenBSD__ 119 struct ether_header *ep; 120 u_short ether_type; 121 extern u_short extracted_ethertype; 122 #endif 123 124 memcpy((char *)&family, (char *)p, sizeof(family)); 125 family = ntohl(family); 126 127 ts_print(&h->ts); 128 129 /* 130 * Some printers want to get back at the link level addresses, 131 * and/or check that they're not walking off the end of the packet. 132 * Rather than pass them all the way down, we set these globals. 133 */ 134 packetp = p; 135 snapend = p + caplen; 136 137 length -= NULL_HDRLEN; 138 139 if (eflag) 140 null_print(p, (struct ip *)(p + NULL_HDRLEN), length); 141 142 switch (family) { 143 case AF_INET: 144 ip_print(p + NULL_HDRLEN, length); 145 break; 146 147 #ifdef INET6 148 case AF_INET6: 149 ip6_print(p + NULL_HDRLEN, length); 150 break; 151 #endif /*INET6*/ 152 153 #ifdef __OpenBSD__ 154 case AF_LINK: 155 if (caplen < sizeof(struct ether_header) + NULL_HDRLEN) { 156 printf("[|ether]"); 157 goto out; 158 } 159 160 length -= sizeof(struct ether_header); 161 caplen -= sizeof(struct ether_header); 162 ep = (struct ether_header *)(p + NULL_HDRLEN); 163 p += NULL_HDRLEN + sizeof(struct ether_header); 164 packetp += sizeof(struct ether_header); 165 ether_type = ntohs(ep->ether_type); 166 167 extracted_ethertype = 0; 168 if (ether_type <= ETHERMTU) { 169 /* Try to print the LLC-layer header & higher layers */ 170 if (llc_print(p, length, caplen, ESRC(ep), 171 EDST(ep)) == 0) { 172 /* ether_type not known, print raw packet */ 173 if (!eflag) 174 ether_print((u_char *)ep, length); 175 if (extracted_ethertype) { 176 printf("(LLC %s) ", 177 etherproto_string(htons(extracted_ethertype))); 178 } 179 if (!xflag && !qflag) 180 default_print(p, caplen); 181 } 182 } else if (ether_encap_print(ether_type, p, length, 183 caplen) == 0) { 184 /* ether_type not known, print raw packet */ 185 if (!eflag) 186 ether_print((u_char *)ep, length + 187 sizeof(*ep)); 188 if (!xflag && !qflag) 189 default_print(p, caplen); 190 } 191 break; 192 #endif /* __OpenBSD__ */ 193 } 194 195 if (xflag) 196 default_print((const u_char *)(packetp + NULL_HDRLEN), 197 caplen - NULL_HDRLEN); 198 out: 199 putchar('\n'); 200 } 201 202