| /* |
| * 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; |
| } |
