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));
}
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]");
}