| /* |
| * 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[] = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.16 2002-08-07 05:21:07 guy 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 */ |
| |
| 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 *p, u_int length, u_int caplen, |
| const u_char *esrc, const u_char *edst) |
| { |
| u_int i; |
| int type, len; |
| |
| /* Cisco Discovery Protocol */ |
| |
| if (caplen < 4) { |
| (void)printf("[|cdp]"); |
| return; |
| } |
| |
| i = 0; /* CDP data starts at offset 0 */ |
| printf("CDP v%u, ttl=%us", p[i], p[i + 1]); |
| i += 4; /* skip version, TTL and chksum */ |
| |
| while (i < length) { |
| if (i + 4 > caplen) |
| goto trunc; |
| type = (p[i] << 8) + p[i + 1]; |
| len = (p[i + 2] << 8) + p[i + 3]; |
| |
| if (vflag > 1) |
| printf("\n\t"); |
| |
| if (vflag) |
| printf(" %02x/%02x", type, len); |
| |
| if (i + len > caplen) |
| goto trunc; |
| |
| switch (type) { |
| case 0x00: |
| printf(" Goodbye"); |
| break; |
| case 0x01: |
| printf(" DevID '%.*s'", len - 4, p + i + 4); |
| break; |
| case 0x02: |
| printf(" Addr"); |
| if (cdp_print_addr(p + i + 4, len - 4) < 0) |
| goto trunc; |
| break; |
| case 0x03: |
| printf(" PortID '%.*s'", len - 4, p + i + 4); |
| break; |
| case 0x04: |
| printf(" CAP 0x%02x", (unsigned) p[i + 7]); |
| break; |
| case 0x05: |
| if (vflag > 1) |
| printf(" Version:\n%.*s", len - 4, p + i + 4); |
| else |
| printf(" Version: (suppressed)"); |
| break; |
| case 0x06: |
| printf(" Platform: '%.*s'", len - 4, p + i + 4); |
| break; |
| case 0x07: |
| if (cdp_print_prefixes(p + i + 4, len - 4) < 0) |
| goto trunc; |
| break; |
| case 0x08: /* guess - not documented */ |
| printf(" Protocol-Hello option" ); |
| break; |
| case 0x09: /* guess - not documented */ |
| printf(" VTP Management Domain: '%.*s'", len - 4, |
| p + i + 4); |
| break; |
| case 0x0a: /* guess - not documented */ |
| printf(" Native VLAN ID: %d", |
| (p[i + 4] << 8) + p[i + 4 + 1] ); |
| break; |
| case 0x0b: /* guess - not documented */ |
| printf(" Duplex: %s", p[i + 4] ? "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: /* incomplete doc. */ |
| printf(" ATA-186 VoIP VLAN request, app %d, vlan %d", |
| p[i + 4], EXTRACT_16BITS(&p[i+4+1])); |
| break; |
| case 0x0f: /* incomplete doc. */ |
| printf(" ATA-186 VoIP VLAN assignment" ); |
| break; |
| case 0x10: /* incomplete doc. */ |
| printf(" power consumption: %1.2fW", |
| cdp_get_number(p+i+4, len-4)/1000.0 ); |
| break; |
| case 0x11: /* guess - not documented */ |
| printf(" MTU %u bytes", EXTRACT_32BITS(&p[i+4])); |
| break; |
| case 0x12: /* guess - not documented */ |
| printf(" AVVID trust bitmap 0x%02x", p[i+4] ); |
| break; |
| case 0x13: /* guess - not documented */ |
| printf(" AVVID untrusted ports CoS: 0x%02x", p[i+4]); |
| break; |
| case 0x14: /* guess - not documented */ |
| printf(" System Name: '%.*s'", len - 4, |
| p + i + 4); |
| break; |
| case 0x15: /* guess - not documented */ |
| printf(" System Object ID (not decoded) "); /* TODO */ |
| break; |
| case 0x16: /* guess - not documented */ |
| printf(" Management Addresses: "); |
| if (cdp_print_addr(p + i + 4, len - 4) < 0) |
| goto trunc; |
| break; |
| case 0x17: /* guess - not documented */ |
| printf(" Physical Location: 0x%02x/%.*s", |
| p[i+4], len - 5, p + i + 5 ); |
| break; |
| default: |
| printf(" unknown field type %02x, len %d", type, len); |
| break; |
| } |
| |
| /* avoid infinite loop */ |
| if (len == 0) |
| break; |
| i += len; |
| } |
| |
| 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 |
| |
| num = EXTRACT_32BITS(p); |
| p += 4; |
| |
| printf(" (%d): ", num); |
| |
| while (p < endp && num >= 0) { |
| if (p + 2 > endp) |
| goto trunc; |
| pt = p[0]; /* type of "protocol" field */ |
| pl = p[1]; /* length of "protocol" field */ |
| p += 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; |
| |
| if (p + 4 > endp) |
| goto trunc; |
| printf("IPv4 %u.%u.%u.%u", p[0], p[1], p[2], p[3]); |
| 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; |
| if (p + al > endp) |
| goto trunc; |
| |
| printf("IPv6 %s", ip6addr_string(p)); |
| p += al; |
| } |
| #endif |
| else { |
| /* |
| * Generic case: just print raw data |
| */ |
| if (p + pl > endp) |
| goto trunc; |
| printf("pt=0x%02x, pl=%d, pb=", *(p - 2), pl); |
| while (pl-- > 0) |
| printf(" %02x", *p++); |
| if (p + 2 > endp) |
| goto trunc; |
| al = (*p << 8) + *(p + 1); |
| printf(", al=%d, a=", al); |
| p += 2; |
| 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; |
| } |