print-cip.c revision 98524
1/* 2 * Marko Kiiskila carnil@cs.tut.fi 3 * 4 * Tampere University of Technology - Telecommunications Laboratory 5 * 6 * Permission to use, copy, modify and distribute this 7 * software and its documentation is hereby granted, 8 * provided that both the copyright notice and this 9 * permission notice appear in all copies of the software, 10 * derivative works or modified versions, and any portions 11 * thereof, that both notices appear in supporting 12 * documentation, and that the use of this software is 13 * acknowledged in any publications resulting from using 14 * the software. 15 * 16 * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR 18 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS 19 * SOFTWARE. 20 * 21 */ 22 23#ifndef lint 24static const char rcsid[] = 25 "@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.16 2001/09/23 21:52:38 guy Exp $ (LBL)"; 26#endif 27 28#ifdef HAVE_CONFIG_H 29#include "config.h" 30#endif 31 32#include <string.h> 33 34#include <sys/param.h> 35#include <sys/time.h> 36#include <sys/types.h> 37#include <sys/socket.h> 38 39 40#include <netinet/in.h> 41 42#include <stdio.h> 43#include <pcap.h> 44 45#include "interface.h" 46#include "addrtoname.h" 47#include "ethertype.h" 48#include "ether.h" 49 50#define RFC1483LLC_LEN 8 51 52static unsigned char rfcllc[] = { 53 0xaa, /* DSAP: non-ISO */ 54 0xaa, /* SSAP: non-ISO */ 55 0x03, /* Ctrl: Unnumbered Information Command PDU */ 56 0x00, /* OUI: EtherType */ 57 0x00, 58 0x00 }; 59 60static inline void 61cip_print(register const u_char *bp, int length) 62{ 63 /* 64 * There is no MAC-layer header, so just print the length. 65 */ 66 printf("%d: ", length); 67} 68 69/* 70 * This is the top level routine of the printer. 'p' is the points 71 * to the raw header of the packet, 'tvp' is the timestamp, 72 * 'length' is the length of the packet off the wire, and 'caplen' 73 * is the number of bytes actually captured. 74 */ 75void 76cip_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 77{ 78 u_int caplen = h->caplen; 79 u_int length = h->len; 80 u_short extracted_ethertype; 81 82 ++infodelay; 83 ts_print(&h->ts); 84 85 if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) { 86 printf("[|cip]"); 87 goto out; 88 } 89 90 if (eflag) 91 cip_print(p, length); 92 93 /* 94 * Some printers want to get back at the ethernet addresses, 95 * and/or check that they're not walking off the end of the packet. 96 * Rather than pass them all the way down, we set these globals. 97 */ 98 packetp = p; 99 snapend = p + caplen; 100 101 if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) { 102 /* 103 * LLC header is present. Try to print it & higher layers. 104 */ 105 if (llc_print(p, length, caplen, NULL, NULL, 106 &extracted_ethertype) == 0) { 107 /* ether_type not known, print raw packet */ 108 if (!eflag) 109 cip_print(p, length); 110 if (extracted_ethertype) { 111 printf("(LLC %s) ", 112 etherproto_string(htons(extracted_ethertype))); 113 } 114 if (!xflag && !qflag) 115 default_print(p, caplen); 116 } 117 } else { 118 /* 119 * LLC header is absent; treat it as just IP. 120 */ 121 ip_print(p, length); 122 } 123 124 if (xflag) 125 default_print(p, caplen); 126 out: 127 putchar('\n'); 128 --infodelay; 129 if (infoprint) 130 info(0); 131} 132