The Tcpdump Group git mirrors - tcpdump/blobdiff

* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm

*/

* 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 1.1 2000-05-15 00:41:06 assar Exp $";

-#endif

-

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

-#include <sys/param.h>

-#include <sys/time.h>

+#include <netdissect-stdinc.h>

-#include <netinet/in.h>

-

-#include <ctype.h>

-#include <netdb.h>

-#include <stdio.h>

#include <string.h>

-#include "interface.h"

+#include "netdissect.h"

#include "addrtoname.h"

-#include "extract.h" /* must come after interface.h */

+#include "extract.h"

+#include "nlpid.h"

-static void cdp_print_addr( const u_char * p, int l );

+static const char tstr[] = "[|cdp]";

-/*

- * 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;

+#define CDP_HEADER_LEN 4

+#define CDP_HEADER_VERSION_OFFSET 0

+#define CDP_HEADER_TTL_OFFSET 1

+#define CDP_HEADER_CHECKSUM_OFFSET 2

- /* Cisco Discovery Protocol */

+#define CDP_TLV_HEADER_LEN 4

+#define CDP_TLV_TYPE_OFFSET 0

+#define CDP_TLV_LEN_OFFSET 2

+static const 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}

+};

- if ( caplen < 12 ) {

- (void)printf("[|cdp]");

+static const 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(netdissect_options *, const u_char *, int);

+static int cdp_print_prefixes(netdissect_options *, const u_char *, int);

+static unsigned long cdp_get_number(const u_char *, int);

+

+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;

}

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 */

+ tptr = pptr; /* temporary pointer */

- 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];

+ 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;

- if ( vflag )

- printf( "\n\t%02x/%02x", type, len );

- else

- printf( "\n\t" );

+ 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;

- 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:\n%.*s", len-4, p+i+4 );

- else

- printf( " Version: (suppressed)" );

- break;

- case 0x06:

- printf( " Platform: '%.*s'", len-4, p+i+4 );

- break;

- default:

- printf( " unknown field type %02x, len %d",

- type, len );

- }

- i+=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);

+ ND_PRINT((ndo, "%c", j));

+ if (j == 0x0a) /* lets rework the version string to get a nice indentation */

+ ND_PRINT((ndo, "\t "));

+ }

+ 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));

}

-static void

-cdp_print_addr( const u_char * p, int l )

+/*

+ * 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(netdissect_options *ndo,

+ 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++);

+ int pt, pl, al, num;

+ const u_char *endp = p + l;

+ static const u_char prot_ipv6[] = {

+ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd

+ };

+

+ ND_TCHECK2(*p, 4);

+ if (p + 4 > endp)

+ goto trunc;

+ num = EXTRACT_32BITS(p);

+ p += 4;

+

+ while (p < endp && num >= 0) {

+ ND_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;

+

+ ND_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;

+

+ ND_TCHECK2(*p, 4);

+ if (p + 4 > endp)

+ goto trunc;

+ ND_PRINT((ndo, "IPv4 (%u) %s", num, ipaddr_string(ndo, p)));

+ p += 4;

+ }

+ 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;

+ ND_TCHECK2(*p, al);

+ if (p + al > endp)

+ goto trunc;

+

+ ND_PRINT((ndo, "IPv6 (%u) %s", num, ip6addr_string(ndo, p)));

+ p += al;

+ }

+ else {

+ /*

+ * Generic case: just print raw data

+ */

+ ND_TCHECK2(*p, pl);

+ if (p + pl > endp)

+ goto trunc;

+ ND_PRINT((ndo, "pt=0x%02x, pl=%d, pb=", *(p - 2), pl));

+ while (pl-- > 0)

+ ND_PRINT((ndo, " %02x", *p++));

+ ND_TCHECK2(*p, 2);

+ if (p + 2 > endp)

+ goto trunc;

+ al = (*p << 8) + *(p + 1);

+ ND_PRINT((ndo, ", al=%d, a=", al));

+ p += 2;

+ ND_TCHECK2(*p, al);

+ if (p + al > endp)

+ goto trunc;

+ while (al-- > 0)

+ ND_PRINT((ndo, " %02x", *p++));

}

- printf(" ");

num--;

+ if (num)

+ ND_PRINT((ndo, " "));

+ }

+

+ return 0;

+

+trunc:

+ return -1;

+}

+

+static int

+cdp_print_prefixes(netdissect_options *ndo,

+ const u_char * p, int l)

+{

+ if (l % 5)

+ goto trunc;

+

+ ND_PRINT((ndo, " IPv4 Prefixes (%d):", l / 5));

+

+ while (l > 0) {

+ ND_PRINT((ndo, " %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;

}