1 /* 2 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997 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 * $FreeBSD$ 22 */ 23 24 #ifndef lint 25 static const char rcsid[] = 26 "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.30 1999/12/22 06:27:21 itojun Exp $ (LBL)"; 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/socket.h> 36 #include <sys/file.h> 37 #include <sys/ioctl.h> 38 39 #if __STDC__ 40 struct mbuf; 41 struct rtentry; 42 #endif 43 #include <net/if.h> 44 45 #include <netinet/in.h> 46 #include <netinet/in_systm.h> 47 #include <netinet/ip.h> 48 #include <net/ethernet.h> 49 #include <netinet/ip_var.h> 50 #include <netinet/udp.h> 51 #include <netinet/udp_var.h> 52 #include <netinet/tcp.h> 53 54 #include <pcap.h> 55 #include <stdio.h> 56 #include <string.h> 57 58 #ifdef INET6 59 #include <netinet/ip6.h> 60 #endif 61 62 #include "interface.h" 63 #include "addrtoname.h" 64 65 #ifndef AF_NS 66 #define AF_NS 6 /* XEROX NS protocols */ 67 #endif 68 69 /* 70 * The DLT_NULL packet header is 4 bytes long. It contains a network 71 * order 32 bit integer that specifies the family, e.g. AF_INET 72 */ 73 #define NULL_HDRLEN 4 74 75 static void 76 null_print(const u_char *p, const struct ip *ip, u_int length) 77 { 78 u_int family; 79 80 memcpy((char *)&family, (char *)p, sizeof(family)); 81 82 if (nflag) { 83 /* XXX just dump the header */ 84 return; 85 } 86 switch (family) { 87 88 case AF_INET: 89 printf("ip: "); 90 break; 91 92 #ifdef INET6 93 case AF_INET6: 94 printf("ip6: "); 95 break; 96 #endif 97 98 case AF_NS: 99 printf("ns: "); 100 break; 101 102 default: 103 printf("AF %d: ", family); 104 break; 105 } 106 } 107 108 void 109 null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 110 { 111 u_int length = h->len; 112 u_int caplen = h->caplen; 113 const struct ip *ip; 114 115 ts_print(&h->ts); 116 117 /* 118 * Some printers want to get back at the link level addresses, 119 * and/or check that they're not walking off the end of the packet. 120 * Rather than pass them all the way down, we set these globals. 121 */ 122 packetp = p; 123 snapend = p + caplen; 124 125 length -= NULL_HDRLEN; 126 127 ip = (struct ip *)(p + NULL_HDRLEN); 128 129 if (eflag) 130 null_print(p, ip, length); 131 132 switch (ip->ip_v) { 133 case 4: 134 ip_print((const u_char *)ip, length); 135 break; 136 #ifdef INET6 137 case 6: 138 ip6_print((const u_char *)ip, length); 139 break; 140 #endif /* INET6 */ 141 default: 142 printf("ip v%d", ip->ip_v); 143 break; 144 } 145 146 if (xflag) 147 default_print((const u_char *)ip, caplen - NULL_HDRLEN); 148 putchar('\n'); 149 } 150 151