diff options
Diffstat (limited to 'contrib/tcpdump/print-cdp.c')
| -rw-r--r-- | contrib/tcpdump/print-cdp.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-cdp.c b/contrib/tcpdump/print-cdp.c new file mode 100644 index 0000000..4398fbe --- /dev/null +++ b/contrib/tcpdump/print-cdp.c @@ -0,0 +1,366 @@ +/* + * 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 + */ + +#ifndef lint +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.25 2004/10/07 14:53:11 hannes Exp $"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include <stdio.h> +#include <string.h> + +#include "interface.h" +#include "addrtoname.h" +#include "extract.h" /* must come after interface.h */ +#include "nlpid.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<len;i++) { + j = *(tptr+i); + putchar(j); + if (j == 0x0a) /* lets rework the version string to get a nice identation */ + printf("\t "); + } + break; + case 0x06: /* Platform */ + printf("'%.*s'", len, tptr); + break; + case 0x07: /* Prefixes */ + if (cdp_print_prefixes(tptr, len) < 0) + goto trunc; + break; + case 0x08: /* Protocol Hello Option - not documented */ + break; + case 0x09: /* VTP Mgmt Domain - not documented */ + printf("'%.*s'", len,tptr); + break; + case 0x0a: /* Native VLAN ID - not documented */ + printf("%d",EXTRACT_16BITS(tptr)); + break; + case 0x0b: /* Duplex - not documented */ + printf("%s", *(tptr) ? "full": "half"); + break; + + /* http://www.cisco.com/univercd/cc/td/doc/product/voice/ata/atarn/186rn21m.htm + * plus more details from other sources + */ + case 0x0e: /* ATA-186 VoIP VLAN request - incomplete doc. */ + printf("app %d, vlan %d", + *(tptr), EXTRACT_16BITS(tptr+1)); + break; + case 0x10: /* ATA-186 VoIP VLAN assignment - incomplete doc. */ + printf("%1.2fW", + cdp_get_number(tptr, len)/1000.0 ); + break; + case 0x11: /* MTU - not documented */ + printf("%u bytes", EXTRACT_32BITS(tptr)); + break; + case 0x12: /* AVVID trust bitmap - not documented */ + printf("0x%02x", *(tptr) ); + break; + case 0x13: /* AVVID untrusted port CoS - not documented */ + printf("0x%02x", *(tptr)); + break; + case 0x14: /* System Name - not documented */ + printf("'%.*s'", len, tptr); + break; + case 0x16: /* System Object ID - not documented */ + if (cdp_print_addr(tptr, len) < 0) + goto trunc; + break; + case 0x17: /* Physical Location - not documented */ + printf("0x%02x/%.*s", *(tptr), len - 1, tptr + 1 ); + break; + default: + print_unknown_data(tptr,"\n\t ",len); + break; + } + } + /* avoid infinite loop */ + if (len == 0) + break; + tptr = tptr+len; + } + if (vflag < 1) + printf(", length %u",caplen); + + return; +trunc: + printf("[|cdp]"); +} + +/* + * Protocol type values. + * + * PT_NLPID means that the protocol type field contains an OSI NLPID. + * + * PT_IEEE_802_2 means that the protocol type field contains an IEEE 802.2 + * LLC header that specifies that the payload is for that protocol. + */ +#define PT_NLPID 1 /* OSI NLPID */ +#define PT_IEEE_802_2 2 /* IEEE 802.2 LLC header */ + +static int +cdp_print_addr(const u_char * p, int l) +{ + int pt, pl, al, num; + const u_char *endp = p + l; +#ifdef INET6 + static u_char prot_ipv6[] = { + 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd + }; +#endif + + TCHECK2(*p, 2); + num = EXTRACT_32BITS(p); + p += 4; + + while (p < endp && num >= 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 == NLPID_IP && 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 <n>-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; +} |
