X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/f085c93f59fb2332e09f3da20eef5fb2bbd04431..5ef0bcb5edd748de9d9af13c40da0395dfdd94e8:/print-cdp.c

diff --git a/print-cdp.c b/print-cdp.c
index 908f55f4..0ab646e5 100644
--- a/print-cdp.c
+++ b/print-cdp.c
@@ -21,16 +21,16 @@
  * Code by Gert Doering, SpaceNet GmbH, gert@space.net
  *
  * Reference documentation:
- *    http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
+ *    https://web.archive.org/web/20000914194913/http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.pdf
  */
 
 /* \summary: Cisco Discovery Protocol (CDP) printer */
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
-#include <netdissect-stdinc.h>
+#include "netdissect-stdinc.h"
 
 #include <string.h>
 
@@ -39,7 +39,6 @@
 #include "extract.h"
 #include "nlpid.h"
 
-static const char tstr[] = "[|cdp]";
 
 #define CDP_HEADER_LEN             4
 #define CDP_HEADER_VERSION_OFFSET  0
@@ -62,8 +61,8 @@ static const struct tok cdp_tlv_values[] = {
     { 0x09,             "VTP Management Domain"},
     { 0x0a,             "Native VLAN ID"},
     { 0x0b,             "Duplex"},
-    { 0x0e,             "ATA-186 VoIP VLAN request"},
-    { 0x0f,             "ATA-186 VoIP VLAN assignment"},
+    { 0x0e,             "ATA-186 VoIP VLAN assignment"},
+    { 0x0f,             "ATA-186 VoIP VLAN request"},
     { 0x10,             "power consumption"},
     { 0x11,             "MTU"},
     { 0x12,             "AVVID trust bitmap"},
@@ -86,102 +85,108 @@ static const struct tok cdp_capability_values[] = {
     { 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);
+static int cdp_print_addr(netdissect_options *, const u_char *, u_int);
+static int cdp_print_prefixes(netdissect_options *, const u_char *, u_int);
+static unsigned int cdp_get_number(netdissect_options *, const u_char *, u_int);
 
 void
 cdp_print(netdissect_options *ndo,
           const u_char *pptr, u_int length, u_int caplen)
 {
-	int type, len, i, j;
+	u_int type, len, i;
 	const u_char *tptr;
 
+	ndo->ndo_protocol = "cdp";
 	if (caplen < CDP_HEADER_LEN) {
-		ND_PRINT((ndo, "%s", tstr));
+		nd_print_trunc(ndo);
 		return;
 	}
 
 	tptr = pptr; /* temporary pointer */
 
-	ND_TCHECK2(*tptr, CDP_HEADER_LEN);
-	ND_PRINT((ndo, "CDPv%u, ttl: %us", EXTRACT_U_1((tptr + CDP_HEADER_VERSION_OFFSET)),
-					   EXTRACT_U_1(tptr + CDP_HEADER_TTL_OFFSET)));
+	ND_TCHECK_LEN(tptr, CDP_HEADER_LEN);
+	ND_PRINT("CDPv%u, ttl: %us",
+					   GET_U_1((tptr + CDP_HEADER_VERSION_OFFSET)),
+					   GET_U_1(tptr + CDP_HEADER_TTL_OFFSET));
 	if (ndo->ndo_vflag)
-		ND_PRINT((ndo, ", checksum: 0x%04x (unverified), length %u", EXTRACT_BE_U_2(tptr + CDP_HEADER_CHECKSUM_OFFSET), length));
+		ND_PRINT(", checksum: 0x%04x (unverified), length %u",
+			 GET_BE_U_2(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_BE_U_2(tptr + CDP_TLV_TYPE_OFFSET);
-		len  = EXTRACT_BE_U_2(tptr + CDP_TLV_LEN_OFFSET); /* object length includes the 4 bytes header length */
+		ND_TCHECK_LEN(tptr, CDP_TLV_HEADER_LEN); /* read out Type and Length */
+		type = GET_BE_U_2(tptr + CDP_TLV_TYPE_OFFSET);
+		len  = GET_BE_U_2(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)",
+			ND_PRINT("\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 */
+			       PLURAL_SUFFIX(len)); /* plural */
 		    else
-			ND_PRINT((ndo, ", %s TLV length %u too short",
+			ND_PRINT(", %s TLV length %u too short",
 			       tok2str(cdp_tlv_values,"unknown field type", type),
-			       len));
+			       len);
 		    break;
 		}
 		tptr += CDP_TLV_HEADER_LEN;
 		len -= CDP_TLV_HEADER_LEN;
 
-		ND_TCHECK2(*tptr, len);
+		ND_TCHECK_LEN(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: ",
+			ND_PRINT("\n\t%s (0x%02x), value length: %u byte%s: ",
 			       tok2str(cdp_tlv_values,"unknown field type", type),
 			       type,
 			       len,
-			       PLURAL_SUFFIX(len))); /* plural */
+			       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, "'"));
+			    ND_PRINT(", Device-ID ");
+			ND_PRINT("'");
+			(void)nd_printn(ndo, tptr, len, NULL);
+			ND_PRINT("'");
 			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, "'"));
+			ND_PRINT("'");
+			(void)nd_printn(ndo, tptr, len, NULL);
+			ND_PRINT("'");
 			break;
 		    case 0x04: /* Capabilities */
 			if (len < 4)
 			    goto trunc;
-			ND_PRINT((ndo, "(0x%08x): %s",
-			       EXTRACT_BE_U_4(tptr),
-			       bittok2str(cdp_capability_values, "none", EXTRACT_BE_U_4(tptr))));
+			ND_PRINT("(0x%08x): %s",
+			       GET_BE_U_4(tptr),
+			       bittok2str(cdp_capability_values, "none", GET_BE_U_4(tptr)));
 			break;
 		    case 0x05: /* Version */
-			ND_PRINT((ndo, "\n\t  "));
+			ND_PRINT("\n\t  ");
 			for (i=0;i<len;i++) {
-			    j = EXTRACT_U_1(tptr + i);
-			    if (j == '\n') /* lets rework the version string to
+			    u_char c;
+
+			    c = GET_U_1(tptr + i);
+			    if (c == '\n') /* lets rework the version string to
 					      get a nice indentation */
-				ND_PRINT((ndo, "\n\t  "));
+				ND_PRINT("\n\t  ");
 			    else
-				fn_print_char(ndo, j);
+				fn_print_char(ndo, c);
 			}
 			break;
 		    case 0x06: /* Platform */
-			ND_PRINT((ndo, "'"));
-			(void)fn_printn(ndo, tptr, len, NULL);
-			ND_PRINT((ndo, "'"));
+			ND_PRINT("'");
+			(void)nd_printn(ndo, tptr, len, NULL);
+			ND_PRINT("'");
 			break;
 		    case 0x07: /* Prefixes */
 			if (cdp_print_prefixes(ndo, tptr, len) < 0)
@@ -190,51 +195,70 @@ cdp_print(netdissect_options *ndo,
 		    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, "'"));
+			ND_PRINT("'");
+			(void)nd_printn(ndo, tptr, len, NULL);
+			ND_PRINT("'");
 			break;
 		    case 0x0a: /* Native VLAN ID - CDPv2 */
 			if (len < 2)
 			    goto trunc;
-			ND_PRINT((ndo, "%d", EXTRACT_BE_U_2(tptr)));
+			ND_PRINT("%u", GET_BE_U_2(tptr));
 			break;
 		    case 0x0b: /* Duplex - CDPv2 */
 			if (len < 1)
 			    goto trunc;
-			ND_PRINT((ndo, "%s", EXTRACT_U_1(tptr) ? "full": "half"));
+			ND_PRINT("%s", GET_U_1(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
+		    /* https://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
+		     *
+		     * There are apparently versions of the request with both
+		     * 2 bytes and 3 bytes of value.  The 3 bytes of value
+		     * appear to be a 1-byte application type followed by a
+		     * 2-byte VLAN ID; the 2 bytes of value are unknown
+		     * (they're 0x20 0x00 in some captures I've seen; that
+		     * is not a valid VLAN ID, as VLAN IDs are 12 bits).
+		     *
+		     * The replies all appear to be 3 bytes long.
 		     */
-		    case 0x0e: /* ATA-186 VoIP VLAN request - incomplete doc. */
+		    case 0x0e: /* ATA-186 VoIP VLAN assignment - incomplete doc. */
 			if (len < 3)
 			    goto trunc;
-			ND_PRINT((ndo, "app %d, vlan %d", EXTRACT_U_1((tptr)), EXTRACT_BE_U_2(tptr + 1)));
+			ND_PRINT("app %u, vlan %u", GET_U_1(tptr),
+				 GET_BE_U_2(tptr + 1));
+			break;
+		    case 0x0f: /* ATA-186 VoIP VLAN request - incomplete doc. */
+			if (len < 2)
+			    goto trunc;
+			if (len == 2)
+			    ND_PRINT("unknown 0x%04x", GET_BE_U_2(tptr));
+			else
+			    ND_PRINT("app %u, vlan %u", GET_U_1(tptr),
+				     GET_BE_U_2(tptr + 1));
 			break;
-		    case 0x10: /* ATA-186 VoIP VLAN assignment - incomplete doc. */
-			ND_PRINT((ndo, "%1.2fW", cdp_get_number(tptr, len) / 1000.0));
+		    case 0x10: /* Power - not documented */
+			ND_PRINT("%1.2fW", cdp_get_number(ndo, tptr, len) / 1000.0);
 			break;
 		    case 0x11: /* MTU - not documented */
 			if (len < 4)
 			    goto trunc;
-			ND_PRINT((ndo, "%u bytes", EXTRACT_BE_U_4(tptr)));
+			ND_PRINT("%u bytes", GET_BE_U_4(tptr));
 			break;
 		    case 0x12: /* AVVID trust bitmap - not documented */
 			if (len < 1)
 			    goto trunc;
-			ND_PRINT((ndo, "0x%02x", EXTRACT_U_1(tptr)));
+			ND_PRINT("0x%02x", GET_U_1(tptr));
 			break;
 		    case 0x13: /* AVVID untrusted port CoS - not documented */
 			if (len < 1)
 			    goto trunc;
-			ND_PRINT((ndo, "0x%02x", EXTRACT_U_1(tptr)));
+			ND_PRINT("0x%02x", GET_U_1(tptr));
 			break;
 		    case 0x14: /* System Name - not documented */
-			ND_PRINT((ndo, "'"));
-			(void)fn_printn(ndo, tptr, len, NULL);
-			ND_PRINT((ndo, "'"));
+			ND_PRINT("'");
+			(void)nd_printn(ndo, tptr, len, NULL);
+			ND_PRINT("'");
 			break;
 		    case 0x16: /* System Object ID - not documented */
 			if (cdp_print_addr(ndo, tptr, len) < 0)
@@ -243,10 +267,10 @@ cdp_print(netdissect_options *ndo,
 		    case 0x17: /* Physical Location - not documented */
 			if (len < 1)
 			    goto trunc;
-			ND_PRINT((ndo, "0x%02x", EXTRACT_U_1(tptr)));
+			ND_PRINT("0x%02x", GET_U_1(tptr));
 			if (len > 1) {
-				ND_PRINT((ndo, "/"));
-				(void)fn_printn(ndo, tptr + 1, len - 1, NULL);
+				ND_PRINT("/");
+				(void)nd_printn(ndo, tptr + 1, len - 1, NULL);
 			}
 			break;
 		    default:
@@ -257,11 +281,11 @@ cdp_print(netdissect_options *ndo,
 		tptr = tptr+len;
 	}
 	if (ndo->ndo_vflag < 1)
-	    ND_PRINT((ndo, ", length %u", caplen));
+	    ND_PRINT(", length %u", caplen);
 
 	return;
 trunc:
-	ND_PRINT((ndo, "%s", tstr));
+	nd_print_trunc(ndo);
 }
 
 /*
@@ -277,9 +301,9 @@ trunc:
 
 static int
 cdp_print_addr(netdissect_options *ndo,
-	       const u_char * p, int l)
+	       const u_char * p, u_int l)
 {
-	int pt, pl, al, num;
+	u_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
@@ -288,23 +312,24 @@ cdp_print_addr(netdissect_options *ndo,
 	ND_TCHECK_4(p);
 	if (p + 4 > endp)
 		goto trunc;
-	num = EXTRACT_BE_U_4(p);
+	num = GET_BE_U_4(p);
 	p += 4;
 
-	while (p < endp && num >= 0) {
+	while (p < endp && num != 0) {
 		ND_TCHECK_2(p);
 		if (p + 2 > endp)
 			goto trunc;
-		pt = p[0];		/* type of "protocol" field */
-		pl = p[1];		/* length of "protocol" field */
+		pt = GET_U_1(p);		/* type of "protocol" field */
+		pl = GET_U_1(p + 1);	/* length of "protocol" field */
 		p += 2;
 
 		ND_TCHECK_2(p + pl);
 		if (p + pl + 2 > endp)
 			goto trunc;
-		al = EXTRACT_BE_U_2(p + pl);	/* address length */
+		al = GET_BE_U_2(p + pl);	/* address length */
 
-		if (pt == PT_NLPID && pl == 1 && *p == NLPID_IP && al == 4) {
+		if (pt == PT_NLPID && pl == 1 && GET_U_1(p) == NLPID_IP &&
+		    al == 4) {
 			/*
 			 * IPv4: protocol type = NLPID, protocol length = 1
 			 * (1-byte NLPID), protocol = 0xcc (NLPID for IPv4),
@@ -312,10 +337,9 @@ cdp_print_addr(netdissect_options *ndo,
 			 */
 			p += 3;
 
-			ND_TCHECK_4(p);
 			if (p + 4 > endp)
 				goto trunc;
-			ND_PRINT((ndo, "IPv4 (%u) %s", num, ipaddr_string(ndo, p)));
+			ND_PRINT("IPv4 (%u) %s", num, GET_IPADDR_STRING(p));
 			p += 4;
 		}
 		else if (pt == PT_IEEE_802_2 && pl == 8 &&
@@ -327,41 +351,44 @@ cdp_print_addr(netdissect_options *ndo,
 			 * Ethertype, address length = 16
 			 */
 			p += 10;
-			ND_TCHECK2(*p, al);
+			ND_TCHECK_LEN(p, al);
 			if (p + al > endp)
 				goto trunc;
 
-			ND_PRINT((ndo, "IPv6 (%u) %s", num, ip6addr_string(ndo, p)));
+			ND_PRINT("IPv6 (%u) %s", num, GET_IP6ADDR_STRING(p));
 			p += al;
 		}
 		else {
 			/*
 			 * Generic case: just print raw data
 			 */
-			ND_TCHECK2(*p, pl);
+			ND_TCHECK_LEN(p, pl);
 			if (p + pl > endp)
 				goto trunc;
-			ND_PRINT((ndo, "pt=0x%02x, pl=%d, pb=", EXTRACT_U_1((p - 2)), pl));
-			while (pl-- > 0) {
-				ND_PRINT((ndo, " %02x", EXTRACT_U_1(p)));
+			ND_PRINT("pt=0x%02x, pl=%u, pb=", GET_U_1((p - 2)),
+				 pl);
+			while (pl != 0) {
+				ND_PRINT(" %02x", GET_U_1(p));
 				p++;
+				pl--;
 			}
 			ND_TCHECK_2(p);
 			if (p + 2 > endp)
 				goto trunc;
-			ND_PRINT((ndo, ", al=%d, a=", al));
+			ND_PRINT(", al=%u, a=", al);
 			p += 2;
-			ND_TCHECK2(*p, al);
+			ND_TCHECK_LEN(p, al);
 			if (p + al > endp)
 				goto trunc;
-			while (al-- > 0) {
-				ND_PRINT((ndo, " %02x", EXTRACT_U_1(p)));
+			while (al != 0) {
+				ND_PRINT(" %02x", GET_U_1(p));
 				p++;
+				al--;
 			}
 		}
 		num--;
 		if (num)
-			ND_PRINT((ndo, " "));
+			ND_PRINT(" ");
 	}
 
 	return 0;
@@ -373,17 +400,17 @@ trunc:
 
 static int
 cdp_print_prefixes(netdissect_options *ndo,
-		   const u_char * p, int l)
+		   const u_char * p, u_int l)
 {
 	if (l % 5)
 		goto trunc;
 
-	ND_PRINT((ndo, " IPv4 Prefixes (%d):", l / 5));
+	ND_PRINT(" IPv4 Prefixes (%u):", l / 5);
 
 	while (l > 0) {
-		ND_PRINT((ndo, " %u.%u.%u.%u/%u",
-			  EXTRACT_U_1(p), EXTRACT_U_1(p + 1), EXTRACT_U_1(p + 2),
-			  EXTRACT_U_1(p + 3), EXTRACT_U_1(p + 4)));
+		ND_PRINT(" %u.%u.%u.%u/%u",
+			  GET_U_1(p), GET_U_1(p + 1), GET_U_1(p + 2),
+			  GET_U_1(p + 3), GET_U_1(p + 4));
 		l -= 5;
 		p += 5;
 	}
@@ -395,14 +422,15 @@ trunc:
 }
 
 /* read in a <n>-byte number, MSB first
- * (of course this can handle max sizeof(long))
+ * (of course this can handle max sizeof(int))
  */
-static unsigned long cdp_get_number(const u_char * p, int l)
+static unsigned int
+cdp_get_number(netdissect_options *ndo, const u_char * p, u_int l)
 {
-    unsigned long res=0;
+    unsigned int res=0;
     while( l>0 )
     {
-	res = (res<<8) + EXTRACT_U_1(p);
+	res = (res<<8) + GET_U_1(p);
 	p++; l--;
     }
     return res;