/* $NetBSD: print-cdp.c,v 1.5 2004/09/27 23:04:24 dyoung Exp $ */ /* * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Code by Gert Doering, SpaceNet GmbH, gert@space.net * * Reference documentation: * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm */ #include #ifndef lint #if 0 static const char rcsid[] _U_ = "@(#) Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.19.2.5 2004/03/24 06:00:51 guy Exp"; #else __RCSID("$NetBSD: print-cdp.c,v 1.5 2004/09/27 23:04:24 dyoung Exp $"); #endif #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "interface.h" #include "addrtoname.h" #include "extract.h" /* must come after interface.h */ #define CDP_HEADER_LEN 4 static struct tok cdp_tlv_values[] = { { 0x01, "Device-ID"}, { 0x02, "Address"}, { 0x03, "Port-ID"}, { 0x04, "Capability"}, { 0x05, "Version String"}, { 0x06, "Platform"}, { 0x07, "Prefixes"}, { 0x08, "Protocol-Hello option"}, { 0x09, "VTP Management Domain"}, { 0x0a, "Native VLAN ID"}, { 0x0b, "Duplex"}, { 0x0e, "ATA-186 VoIP VLAN request"}, { 0x0f, "ATA-186 VoIP VLAN assignment"}, { 0x10, "power consumption"}, { 0x11, "MTU"}, { 0x12, "AVVID trust bitmap"}, { 0x13, "AVVID untrusted ports CoS"}, { 0x14, "System Name"}, { 0x15, "System Object ID (not decoded)"}, { 0x16, "Management Addresses"}, { 0x17, "Physical Location"}, { 0, NULL} }; static struct tok cdp_capability_values[] = { { 0x01, "Router" }, { 0x02, "Transparent Bridge" }, { 0x04, "Source Route Bridge" }, { 0x08, "L2 Switch" }, { 0x10, "L3 capable" }, { 0x20, "IGMP snooping" }, { 0x40, "L1 capable" }, { 0, NULL } }; static int cdp_print_addr(const u_char *, int); static int cdp_print_prefixes(const u_char *, int); static unsigned long cdp_get_number(const u_char *, int); void cdp_print(const u_char *pptr, u_int length, u_int caplen) { int type, len, i, j; const u_char *tptr; if (caplen < CDP_HEADER_LEN) { (void)printf("[|cdp]"); return; } tptr = pptr; /* temporary pointer */ if (!TTEST2(*tptr, CDP_HEADER_LEN)) goto trunc; printf("CDPv%u, ttl: %us", *tptr, *(tptr+1)); if (vflag) printf(", checksum: %u (unverified), length %u", EXTRACT_16BITS(tptr), length); tptr += CDP_HEADER_LEN; while (tptr < (pptr+length)) { if (!TTEST2(*tptr, 4)) /* read out Type and Length */ goto trunc; type = EXTRACT_16BITS(tptr); len = EXTRACT_16BITS(tptr+2); /* object length includes the 4 bytes header length */ tptr += 4; len -= 4; if (!TTEST2(*tptr, len)) goto trunc; if (vflag || type == 1) { /* in non-verbose mode just print Device-ID */ if (vflag) printf("\n\t%s (0x%02x), length: %u byte%s: ", tok2str(cdp_tlv_values,"unknown field type", type), type, len, len>1 ? "s" : ""); /* plural */ switch (type) { case 0x01: /* Device-ID */ if (!vflag) printf(", Device-ID '%.*s'", len, tptr); else printf("'%.*s'", len, tptr); break; case 0x02: /* Address */ if (cdp_print_addr(tptr, len) < 0) goto trunc; break; case 0x03: /* Port-ID */ printf("'%.*s'", len, tptr); break; case 0x04: /* Capabilities */ printf("(0x%08x): %s", EXTRACT_32BITS(tptr), bittok2str(cdp_capability_values, "none",EXTRACT_32BITS(tptr))); break; case 0x05: /* Version */ printf("\n\t "); for (i=0;i= 0) { TCHECK2(*p, 2); if (p + 2 > endp) goto trunc; pt = p[0]; /* type of "protocol" field */ pl = p[1]; /* length of "protocol" field */ p += 2; TCHECK2(p[pl], 2); if (p + pl + 2 > endp) goto trunc; al = EXTRACT_16BITS(&p[pl]); /* address length */ if (pt == PT_NLPID && pl == 1 && *p == 0xcc && al == 4) { /* * IPv4: protocol type = NLPID, protocol length = 1 * (1-byte NLPID), protocol = 0xcc (NLPID for IPv4), * address length = 4 */ p += 3; TCHECK2(*p, 4); if (p + 4 > endp) goto trunc; printf("IPv4 (%u) %s", num, ipaddr_string(p)); p += 4; } #ifdef INET6 else if (pt == PT_IEEE_802_2 && pl == 8 && memcmp(p, prot_ipv6, 8) == 0 && al == 16) { /* * IPv6: protocol type = IEEE 802.2 header, * protocol length = 8 (size of LLC+SNAP header), * protocol = LLC+SNAP header with the IPv6 * Ethertype, address length = 16 */ p += 10; TCHECK2(*p, al); if (p + al > endp) goto trunc; printf("IPv6 (%u) %s", num, ip6addr_string(p)); p += al; } #endif else { /* * Generic case: just print raw data */ TCHECK2(*p, pl); if (p + pl > endp) goto trunc; printf("pt=0x%02x, pl=%d, pb=", *(p - 2), pl); while (pl-- > 0) printf(" %02x", *p++); TCHECK2(*p, 2); if (p + 2 > endp) goto trunc; al = (*p << 8) + *(p + 1); printf(", al=%d, a=", al); p += 2; TCHECK2(*p, al); if (p + al > endp) goto trunc; while (al-- > 0) printf(" %02x", *p++); } num--; if (num) printf(" "); } return 0; trunc: return -1; } static int cdp_print_prefixes(const u_char * p, int l) { if (l % 5) goto trunc; printf(" IPv4 Prefixes (%d):", l / 5); while (l > 0) { printf(" %u.%u.%u.%u/%u", p[0], p[1], p[2], p[3], p[4]); l -= 5; p += 5; } return 0; trunc: return -1; } /* read in a -byte number, MSB first * (of course this can handle max sizeof(long)) */ static unsigned long cdp_get_number(const u_char * p, int l) { unsigned long res=0; while( l>0 ) { res = (res<<8) + *p; p++; l--; } return res; }