/* $OpenBSD: print-cdp.c,v 1.4 2009/10/27 23:59:55 deraadt 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 <sys/param.h> #include <sys/time.h> #include <netinet/in.h> #include <ctype.h> #include <netdb.h> #include <stdio.h> #include <string.h> #include "interface.h" #include "addrtoname.h" #include "extract.h" /* must come after interface.h */ void cdp_print_addr(const u_char * p, int l); void cdp_print_prefixes(const u_char * p, int l); /* * Returns non-zero IFF it succeeds in printing the header */ void cdp_print(const u_char *p, u_int length, u_int caplen, const u_char *esrc, const u_char *edst) { int i; int type, len; /* Cisco Discovery Protocol */ if (caplen < 12) { printf("[|cdp]"); return; } i=8; /* CDP data starts at offset 8 */ printf("CDP v%d, ttl=%ds", p[i], p[i+1]); i+=4; /* skip version, TTL and chksum */ while (i < length) { if (i + 4 > caplen) { printf("[!cdp]"); return; } type = (p[i]<<8) + p[i+1]; len = (p[i+2]<<8) + p[i+3]; if (vflag) printf(" %02x/%02x", type, len); if (i+len > caplen) { printf("[!cdp]"); return; } switch(type) { case 0x01: printf(" DevID '%.*s'", len - 4, p + i + 4); break; case 0x02: printf(" Addr"); cdp_print_addr(p + i + 4, len - 4); 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) printf(" Version %.*s", len-4, p+i+4 ); else printf(" Version (suppressed)" ); break; case 0x06: printf(" Platform '%.*s'", len-4, p+i+4 ); break; case 0x07: cdp_print_prefixes(p+i+4, len-4); 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] - 1 ); break; case 0x0b: /* guess - not documented */ printf(" Duplex %s", p[i+4] ? "full": "half" ); break; default: printf(" unknown-type %02x len %d", type, len ); } /* avoid infinite loop */ if (len == 0) break; i += len; } } void cdp_print_addr(const u_char * p, int l) { int pl, al, num; const u_char * endp = p+l; num = (p[0] << 24) + (p[1]<<16) + (p[2]<<8)+ p[3]; p+=4; printf(" (%d): ", num); while(p < endp && num >= 0) { pl=*(p+1); p+=2; /* special case: IPv4, protocol type=0xcc, addr. length=4 */ if (pl == 1 && *p == 0xcc && p[1] == 0 && p[2] == 4) { p+=3; printf("IPv4 %d.%d.%d.%d ", p[0], p[1], p[2], p[3]); p+=4; } else { /* generic case: just print raw data */ printf("pt=0x%02x, pl=%d, pb=", *(p-2), pl); while(pl-- > 0) printf(" %02x", *p++); al=(*p << 8) + *(p+1); printf(", al=%d, a=", al); p+=2; while(al-- > 0) printf(" %02x", *p++); } printf(" "); num--; } } void cdp_print_prefixes(const u_char * p, int l) { printf(" IPv4 Prefixes (%d):", l/5); while (l > 0) { printf(" %d.%d.%d.%d/%d", p[0], p[1], p[2], p[3], p[4] ); l-=5; p+=5; } }