X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/e2464187549fd5846ef8cf739d7ba0648e45afb7..d511b994b9931460771dc56c70b791204178d157:/print-cdp.c

diff --git a/print-cdp.c b/print-cdp.c
index 257f5131..fdc62e89 100644
--- a/print-cdp.c
+++ b/print-cdp.c
@@ -25,21 +25,16 @@
  */
 
 #ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.6 2001-06-15 07:54:19 itojun Exp $";
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.21 2003-11-16 09:36:15 guy Exp $";
 #endif
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <sys/param.h>
-#include <sys/time.h>
+#include <tcpdump-stdinc.h>
 
-#include <netinet/in.h>
-
-#include <ctype.h>
-#include <netdb.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -47,153 +42,313 @@ static const char rcsid[] =
 #include "addrtoname.h"
 #include "extract.h"			/* must come after interface.h */
 
-static void cdp_print_addr(const u_char *, int);
-static void cdp_print_prefixes(const u_char *, int);
+#define CDP_HEADER_LEN  4
+
+static 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}
+};
+
+static 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(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)
+cdp_print(const u_char *pptr, u_int length, u_int caplen)
 {
-	int i;
-	int type, len;
+	int type, len, i, j;
+        const u_char *tptr;
 
-	/* Cisco Discovery Protocol */
-
-	if (caplen < 4) {
+	if (caplen < CDP_HEADER_LEN) {
 		(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 */
+        tptr = pptr; /* temporary pointer */
 
-	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 (!TTEST2(*tptr, CDP_HEADER_LEN))
+                goto trunc;
+	printf("CDP v%u, ttl: %us", *tptr, *(tptr+1));
+        if (vflag)
+                printf(", checksum: %u (unverified)", EXTRACT_16BITS(tptr));
+	tptr += CDP_HEADER_LEN;
 
-		if (vflag > 1)
-			printf("\n\t");
+	while (tptr < (pptr+length)) {
 
-		if (vflag)
-			printf(" %02x/%02x", type, len);
+                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 (i + len > caplen)
+		if (!TTEST2(*tptr, len))
 			goto trunc;
 
-		switch (type) {
-		case 0x01:
-			printf(" DevID '%.*s'", len - 4, p + i + 4);
+                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:
-			printf(" Addr");
-			cdp_print_addr(p + i + 4, len - 4);
+                    case 0x02: /* Address */
+                        if (cdp_print_addr(tptr, len) < 0)
+                            goto trunc;
 			break;
-		case 0x03:
-			printf(" PortID '%.*s'", len - 4, p + i + 4);
+                    case 0x03: /* Port-ID */
+			printf("'%.*s'", len, tptr);
 			break;
-		case 0x04:
-			printf(" CAP 0x%02x", (unsigned) p[i + 7]);
+                    case 0x04: /* Capabilities */
+			printf("(0x%08x): %s",
+                               EXTRACT_32BITS(tptr),
+                               bittok2str(cdp_capability_values, "none",EXTRACT_32BITS(tptr)));
 			break;
-		case 0x05:
-			if (vflag > 1)
-				printf(" Version:\n%.*s", len - 4, p + i + 4);
-			else
-				printf(" Version: (suppressed)");
+                    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:
-			printf(" Platform: '%.*s'", len - 4, p + i + 4);
+                    case 0x06: /* Platform */
+			printf("'%.*s'", len, tptr);
 			break;
-		case 0x07:
-			cdp_print_prefixes(p + i + 4, len - 4);
+                    case 0x07: /* Prefixes */
+			if (cdp_print_prefixes(tptr, len) < 0)
+                            goto trunc;
 			break;
-		case 0x09:		/* guess - not documented */
-			printf(" VTP Management Domain: '%.*s'", len - 4,
-			    p + i + 4);
+                    case 0x08: /* Protocol Hello Option - not documented */
 			break;
-		case 0x0a:		/* guess - not documented */
-			printf(" Native VLAN ID: %d",
-			    (p[i + 4] << 8) + p[i + 4 + 1] - 1);
+                    case 0x09: /* VTP Mgmt Domain  - not documented */
+			printf("'%.*s'", len,tptr);
 			break;
-		case 0x0b:		/* guess - not documented */
-			printf(" Duplex: %s", p[i + 4] ? "full": "half");
+                    case 0x0a: /* Native VLAN ID - not documented */
+			printf("%d",EXTRACT_16BITS(tptr));
 			break;
-		default:
-			printf(" unknown field type %02x, len %d", type, len);
+                    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;
-		i += len;
+		tptr = tptr+len;
 	}
-
 	return;
-
 trunc:
 	printf("[|cdp]");
 }
 
-static void
+/*
+ * 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 pl, al, num;
+	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 = (p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3];
+	num = EXTRACT_32BITS(p);
 	p += 4;
 
-	printf(" (%d): ", num);
-
 	while (p < endp && num >= 0) {
-		if (p + 2 >= endp)
-			break;
-		pl = p[1];
+		if (p + 2 > endp)
+			goto trunc;
+		pt = p[0];		/* type of "protocol" field */
+		pl = p[1];		/* length of "protocol" field */
 		p += 2;
 
-		/* special case: IPv4, protocol type=0xcc, addr. length=4 */
-		if (p + 3 >= endp)
-			break;
-		if (pl == 1 && *p == 0xcc && p[1] == 0 && p[2] == 4) {
-			if (p + 7 >= endp)
-				break;
+		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;
 
-			printf("IPv4 %u.%u.%u.%u ", p[0], p[1], p[2], p[3]);
+			if (p + 4 > endp)
+				goto trunc;
+			printf("IPv4 (%u) %s",
+                               num,
+                               ipaddr_string(p));
 			p += 4;
-		} else {	/* generic case: just print raw data */
-			if (p + pl >= endp)
-				break;
-			printf("pt=0x%02x, pl=%d, pb=", *(p-2), pl);
+		}
+#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 (%u) %s",
+                               num,
+                               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);
-			if (p + 2 + al >= endp)
-				break;
 			printf(", al=%d, a=", al);
 			p += 2;
+			if (p + al > endp)
+				goto trunc;
 			while (al-- > 0)
 				printf(" %02x", *p++);
 		}
-		printf("  ");
 		num--;
+		if (num)
+			printf(" ");
 	}
+
+	return 0;
+
+trunc:
+	return -1;
 }
 
 
-static void
+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) {
-		if (l < 5)
-			break;
 		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;
 }