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 #include <sys/cdefs.h> 24 #ifndef lint 25 __RCSID("$NetBSD: print-cip.c,v 1.4 2014/11/20 03:05:03 christos Exp $"); 26 #endif 27 28 #define NETDISSECT_REWORKED 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <string.h> 34 35 #include <tcpdump-stdinc.h> 36 37 #include "interface.h" 38 #include "addrtoname.h" 39 40 #define RFC1483LLC_LEN 8 41 42 static const unsigned char rfcllc[] = { 43 0xaa, /* DSAP: non-ISO */ 44 0xaa, /* SSAP: non-ISO */ 45 0x03, /* Ctrl: Unnumbered Information Command PDU */ 46 0x00, /* OUI: EtherType */ 47 0x00, 48 0x00 }; 49 50 static inline void 51 cip_print(netdissect_options *ndo, int length) 52 { 53 /* 54 * There is no MAC-layer header, so just print the length. 55 */ 56 ND_PRINT((ndo, "%d: ", length)); 57 } 58 59 /* 60 * This is the top level routine of the printer. 'p' points 61 * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp, 62 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 63 * is the number of bytes actually captured. 64 */ 65 u_int 66 cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 67 { 68 u_int caplen = h->caplen; 69 u_int length = h->len; 70 u_short extracted_ethertype; 71 72 if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) { 73 ND_PRINT((ndo, "[|cip]")); 74 return (0); 75 } 76 77 if (ndo->ndo_eflag) 78 cip_print(ndo, length); 79 80 if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) { 81 /* 82 * LLC header is present. Try to print it & higher layers. 83 */ 84 if (llc_print(ndo, p, length, caplen, NULL, NULL, 85 &extracted_ethertype) == 0) { 86 /* ether_type not known, print raw packet */ 87 if (!ndo->ndo_eflag) 88 cip_print(ndo, length); 89 if (extracted_ethertype) { 90 ND_PRINT((ndo, "(LLC %s) ", 91 etherproto_string(htons(extracted_ethertype)))); 92 } 93 if (!ndo->ndo_suppress_default_print) 94 ND_DEFAULTPRINT(p, caplen); 95 } 96 } else { 97 /* 98 * LLC header is absent; treat it as just IP. 99 */ 100 ip_print(ndo, p, length); 101 } 102 103 return (0); 104 } 105 106 107 /* 108 * Local Variables: 109 * c-style: whitesmith 110 * c-basic-offset: 8 111 * End: 112 */ 113