Beispiel #1
0
void
cdp_print(netdissect_options *ndo,
          const u_char *pptr, u_int length, u_int caplen)
{
	int type, len, i, j;
	const u_char *tptr;

	if (caplen < CDP_HEADER_LEN) {
		ND_PRINT((ndo, "%s", tstr));
		return;
	}

	tptr = pptr; /* temporary pointer */

	ND_TCHECK2(*tptr, CDP_HEADER_LEN);
	ND_PRINT((ndo, "CDPv%u, ttl: %us", *(tptr + CDP_HEADER_VERSION_OFFSET),
					   *(tptr + CDP_HEADER_TTL_OFFSET)));
	if (ndo->ndo_vflag)
		ND_PRINT((ndo, ", checksum: 0x%04x (unverified), length %u", EXTRACT_16BITS(tptr+CDP_HEADER_CHECKSUM_OFFSET), length));
	tptr += CDP_HEADER_LEN;

	while (tptr < (pptr+length)) {
		ND_TCHECK2(*tptr, CDP_TLV_HEADER_LEN); /* read out Type and Length */
		type = EXTRACT_16BITS(tptr+CDP_TLV_TYPE_OFFSET);
		len  = EXTRACT_16BITS(tptr+CDP_TLV_LEN_OFFSET); /* object length includes the 4 bytes header length */
		if (len < CDP_TLV_HEADER_LEN) {
		    if (ndo->ndo_vflag)
			ND_PRINT((ndo, "\n\t%s (0x%02x), TLV length: %u byte%s (too short)",
			       tok2str(cdp_tlv_values,"unknown field type", type),
			       type,
			       len,
			       PLURAL_SUFFIX(len))); /* plural */
		    else
			ND_PRINT((ndo, ", %s TLV length %u too short",
			       tok2str(cdp_tlv_values,"unknown field type", type),
			       len));
		    break;
		}
		tptr += CDP_TLV_HEADER_LEN;
		len -= CDP_TLV_HEADER_LEN;

		ND_TCHECK2(*tptr, len);

		if (ndo->ndo_vflag || type == 1) { /* in non-verbose mode just print Device-ID */

		    if (ndo->ndo_vflag)
			ND_PRINT((ndo, "\n\t%s (0x%02x), value length: %u byte%s: ",
			       tok2str(cdp_tlv_values,"unknown field type", type),
			       type,
			       len,
			       PLURAL_SUFFIX(len))); /* plural */

		    switch (type) {

		    case 0x01: /* Device-ID */
			if (!ndo->ndo_vflag)
			    ND_PRINT((ndo, ", Device-ID "));
			ND_PRINT((ndo, "'"));
			(void)fn_printn(ndo, tptr, len, NULL);
			ND_PRINT((ndo, "'"));
			break;
		    case 0x02: /* Address */
			if (cdp_print_addr(ndo, tptr, len) < 0)
			    goto trunc;
			break;
		    case 0x03: /* Port-ID */
			ND_PRINT((ndo, "'"));
			(void)fn_printn(ndo, tptr, len, NULL);
			ND_PRINT((ndo, "'"));
			break;
		    case 0x04: /* Capabilities */
			if (len < 4)
			    goto trunc;
			ND_PRINT((ndo, "(0x%08x): %s",
			       EXTRACT_32BITS(tptr),
			       bittok2str(cdp_capability_values, "none", EXTRACT_32BITS(tptr))));
			break;
		    case 0x05: /* Version */
			ND_PRINT((ndo, "\n\t  "));
			for (i=0;i<len;i++) {
			    j = *(tptr+i);
			    if (j == '\n') /* lets rework the version string to
					      get a nice indentation */
				ND_PRINT((ndo, "\n\t  "));
			    else
				fn_print_char(ndo, j);
			}
			break;
		    case 0x06: /* Platform */
			ND_PRINT((ndo, "'"));
			(void)fn_printn(ndo, tptr, len, NULL);
			ND_PRINT((ndo, "'"));
			break;
		    case 0x07: /* Prefixes */
			if (cdp_print_prefixes(ndo, tptr, len) < 0)
			    goto trunc;
			break;
		    case 0x08: /* Protocol Hello Option - not documented */
			break;
		    case 0x09: /* VTP Mgmt Domain  - CDPv2 */
			ND_PRINT((ndo, "'"));
			(void)fn_printn(ndo, tptr, len, NULL);
			ND_PRINT((ndo, "'"));
			break;
		    case 0x0a: /* Native VLAN ID - CDPv2 */
			if (len < 2)
			    goto trunc;
			ND_PRINT((ndo, "%d", EXTRACT_16BITS(tptr)));
			break;
		    case 0x0b: /* Duplex - CDPv2 */
			if (len < 1)
			    goto trunc;
			ND_PRINT((ndo, "%s", *(tptr) ? "full": "half"));
			break;

		    /* http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cata/186/2_12_m/english/release/notes/186rn21m.html
		     * plus more details from other sources
		     */
		    case 0x0e: /* ATA-186 VoIP VLAN request - incomplete doc. */
			if (len < 3)
			    goto trunc;
			ND_PRINT((ndo, "app %d, vlan %d", *(tptr), EXTRACT_16BITS(tptr + 1)));
			break;
		    case 0x10: /* ATA-186 VoIP VLAN assignment - incomplete doc. */
			ND_PRINT((ndo, "%1.2fW", cdp_get_number(tptr, len) / 1000.0));
			break;
		    case 0x11: /* MTU - not documented */
			if (len < 4)
			    goto trunc;
			ND_PRINT((ndo, "%u bytes", EXTRACT_32BITS(tptr)));
			break;
		    case 0x12: /* AVVID trust bitmap - not documented */
			if (len < 1)
			    goto trunc;
			ND_PRINT((ndo, "0x%02x", *(tptr)));
			break;
		    case 0x13: /* AVVID untrusted port CoS - not documented */
			if (len < 1)
			    goto trunc;
			ND_PRINT((ndo, "0x%02x", *(tptr)));
			break;
		    case 0x14: /* System Name - not documented */
			ND_PRINT((ndo, "'"));
			(void)fn_printn(ndo, tptr, len, NULL);
			ND_PRINT((ndo, "'"));
			break;
		    case 0x16: /* System Object ID - not documented */
			if (cdp_print_addr(ndo, tptr, len) < 0)
				goto trunc;
			break;
		    case 0x17: /* Physical Location - not documented */
			if (len < 1)
			    goto trunc;
			ND_PRINT((ndo, "0x%02x", *(tptr)));
			if (len > 1) {
				ND_PRINT((ndo, "/"));
				(void)fn_printn(ndo, tptr + 1, len - 1, NULL);
			}
			break;
		    default:
			print_unknown_data(ndo, tptr, "\n\t  ", len);
			break;
		    }
		}
		tptr = tptr+len;
	}
	if (ndo->ndo_vflag < 1)
	    ND_PRINT((ndo, ", length %u", caplen));

	return;
trunc:
	ND_PRINT((ndo, "%s", tstr));
}
Beispiel #2
0
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]");
}