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 24 static const char rcsid[] = 25 "@(#) $Header: /tcpdump/master/tcpdump/print-lane.c,v 1.12 2001/07/05 18:54:15 guy Exp $ (LBL)"; 26 #endif 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <sys/param.h> 33 #include <sys/time.h> 34 #include <sys/types.h> 35 #include <sys/socket.h> 36 37 38 #include <netinet/in.h> 39 40 #include <stdio.h> 41 #include <pcap.h> 42 43 #include "interface.h" 44 #include "addrtoname.h" 45 #include "ether.h" 46 #include "lane.h" 47 48 static inline void 49 lane_print(register const u_char *bp, int length) 50 { 51 register const struct lecdatahdr_8023 *ep; 52 53 ep = (const struct lecdatahdr_8023 *)bp; 54 if (qflag) 55 (void)printf("lecid:%d %s %s %d: ", 56 ntohs(ep->le_header), 57 etheraddr_string(ep->h_source), 58 etheraddr_string(ep->h_dest), 59 length); 60 else 61 (void)printf("lecid:%d %s %s %s %d: ", 62 ntohs(ep->le_header), 63 etheraddr_string(ep->h_source), 64 etheraddr_string(ep->h_dest), 65 etherproto_string(ep->h_type), 66 length); 67 } 68 69 /* 70 * This is the top level routine of the printer. 'p' is the points 71 * to the ether header of the packet, 'h->tv' is the timestamp, 72 * 'h->length' is the length of the packet off the wire, and 'h->caplen' 73 * is the number of bytes actually captured. 74 */ 75 void 76 lane_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 77 { 78 int caplen = h->caplen; 79 int length = h->len; 80 struct lecdatahdr_8023 *ep; 81 u_short ether_type; 82 u_short extracted_ethertype; 83 84 ++infodelay; 85 ts_print(&h->ts); 86 87 if (caplen < sizeof(struct lecdatahdr_8023)) { 88 printf("[|lane]"); 89 goto out; 90 } 91 92 if (eflag) 93 lane_print(p, length); 94 95 /* 96 * Some printers want to get back at the ethernet addresses, 97 * and/or check that they're not walking off the end of the packet. 98 * Rather than pass them all the way down, we set these globals. 99 */ 100 packetp = p; 101 snapend = p + caplen; 102 103 length -= sizeof(struct lecdatahdr_8023); 104 caplen -= sizeof(struct lecdatahdr_8023); 105 ep = (struct lecdatahdr_8023 *)p; 106 p += sizeof(struct lecdatahdr_8023); 107 108 ether_type = ntohs(ep->h_type); 109 110 /* 111 * Is it (gag) an 802.3 encapsulation? 112 */ 113 extracted_ethertype = 0; 114 if (ether_type < ETHERMTU) { 115 /* Try to print the LLC-layer header & higher layers */ 116 if (llc_print(p, length, caplen, ep->h_source, ep->h_dest, 117 &extracted_ethertype) == 0) { 118 /* ether_type not known, print raw packet */ 119 if (!eflag) 120 lane_print((u_char *)ep, length + sizeof(*ep)); 121 if (extracted_ethertype) { 122 printf("(LLC %s) ", 123 etherproto_string(htons(extracted_ethertype))); 124 } 125 if (!xflag && !qflag) 126 default_print(p, caplen); 127 } 128 } else if (ether_encap_print(ether_type, p, length, caplen, 129 &extracted_ethertype) == 0) { 130 /* ether_type not known, print raw packet */ 131 if (!eflag) 132 lane_print((u_char *)ep, length + sizeof(*ep)); 133 if (!xflag && !qflag) 134 default_print(p, caplen); 135 } 136 if (xflag) 137 default_print(p, caplen); 138 out: 139 putchar('\n'); 140 --infodelay; 141 if (infoprint) 142 info(0); 143 } 144