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 22 #ifndef lint 23 static const char rcsid[] = 24 "@(#) $Header: print-null.c,v 1.24 97/05/28 12:52:47 leres Exp $ (LBL)"; 25 #endif 26 27 #include <sys/param.h> 28 #include <sys/time.h> 29 #include <sys/socket.h> 30 #include <sys/file.h> 31 #include <sys/ioctl.h> 32 33 #if __STDC__ 34 struct mbuf; 35 struct rtentry; 36 #endif 37 #include <net/if.h> 38 39 #include <netinet/in.h> 40 #include <netinet/in_systm.h> 41 #include <netinet/ip.h> 42 #include <net/ethernet.h> 43 #include <netinet/ip_var.h> 44 #include <netinet/udp.h> 45 #include <netinet/udp_var.h> 46 #include <netinet/tcp.h> 47 #include <netinet/tcpip.h> 48 49 #include <pcap.h> 50 #include <stdio.h> 51 #include <string.h> 52 53 #include "interface.h" 54 #include "addrtoname.h" 55 56 #ifndef AF_NS 57 #define AF_NS 6 /* XEROX NS protocols */ 58 #endif 59 60 /* 61 * The DLT_NULL packet header is 4 bytes long. It contains a network 62 * order 32 bit integer that specifies the family, e.g. AF_INET 63 */ 64 #define NULL_HDRLEN 4 65 66 static void 67 null_print(const u_char *p, const struct ip *ip, u_int length) 68 { 69 u_int family; 70 71 memcpy((char *)&family, (char *)p, sizeof(family)); 72 73 if (nflag) { 74 /* XXX just dump the header */ 75 return; 76 } 77 switch (family) { 78 79 case AF_INET: 80 printf("ip: "); 81 break; 82 83 case AF_NS: 84 printf("ns: "); 85 break; 86 87 default: 88 printf("AF %d: ", family); 89 break; 90 } 91 } 92 93 void 94 null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 95 { 96 u_int length = h->len; 97 u_int caplen = h->caplen; 98 const struct ip *ip; 99 100 ts_print(&h->ts); 101 102 /* 103 * Some printers want to get back at the link level addresses, 104 * and/or check that they're not walking off the end of the packet. 105 * Rather than pass them all the way down, we set these globals. 106 */ 107 packetp = p; 108 snapend = p + caplen; 109 110 length -= NULL_HDRLEN; 111 112 ip = (struct ip *)(p + NULL_HDRLEN); 113 114 if (eflag) 115 null_print(p, ip, length); 116 117 ip_print((const u_char *)ip, length); 118 119 if (xflag) 120 default_print((const u_char *)ip, caplen - NULL_HDRLEN); 121 putchar('\n'); 122 } 123 124