Adding upstream version 4.99.4.upstream/4.99.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 472 insertions, 0 deletions

diff --git a/print-cdp.c b/print-cdp.c
new file mode 100644
index 0000000..9f5c24b
--- /dev/null
+++ b/print-cdp.c
@@ -0,0 +1,472 @@
+/*
+ * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Code by Gert Doering, SpaceNet GmbH, gert@space.net
+ *
+ * Reference documentation:
+ *    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>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include <string.h>
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+#include "nlpid.h"
+
+
+#define CDP_HEADER_LEN             4
+#define CDP_HEADER_VERSION_OFFSET  0
+#define CDP_HEADER_TTL_OFFSET      1
+#define CDP_HEADER_CHECKSUM_OFFSET 2
+
+#define CDP_TLV_HEADER_LEN  4
+#define CDP_TLV_TYPE_OFFSET 0
+#define CDP_TLV_LEN_OFFSET  2
+
+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 void cdp_print_addr(netdissect_options *, const u_char *, u_int);
+static void cdp_print_prefixes(netdissect_options *, const u_char *, u_int);
+
+static void
+cdp_print_string(netdissect_options *ndo,
+                 const u_char *cp, const u_int len)
+{
+	ND_PRINT("'");
+	(void)nd_printn(ndo, cp, len, NULL);
+	ND_PRINT("'");
+}
+
+static void
+cdp_print_power(netdissect_options *ndo,
+                const u_char *cp, const u_int len)
+{
+	u_int val = 0;
+
+	switch (len) {
+	case 1:
+		val = GET_U_1(cp);
+		break;
+	case 2:
+		val = GET_BE_U_2(cp);
+		break;
+	case 3:
+		val = GET_BE_U_3(cp);
+		break;
+	}
+	ND_PRINT("%1.2fW", val / 1000.0);
+}
+
+static void
+cdp_print_capability(netdissect_options *ndo,
+                     const u_char *cp, const u_int len _U_)
+{
+	uint32_t val = GET_BE_U_4(cp);
+
+	ND_PRINT("(0x%08x): %s", val,
+	         bittok2str(cdp_capability_values, "none", val));
+}
+
+/* Rework the version string to get a nice indentation. */
+static void
+cdp_print_version(netdissect_options *ndo,
+                  const u_char *cp, const u_int len)
+{
+	unsigned i;
+
+	ND_PRINT("\n\t  ");
+	for (i = 0; i < len; i++) {
+		u_char c = GET_U_1(cp + i);
+
+		if (c == '\n')
+			ND_PRINT("\n\t  ");
+		else
+			fn_print_char(ndo, c);
+	}
+}
+
+static void
+cdp_print_uint16(netdissect_options *ndo,
+                 const u_char *cp, const u_int len _U_)
+{
+	ND_PRINT("%u", GET_BE_U_2(cp));
+}
+
+static void
+cdp_print_duplex(netdissect_options *ndo,
+                 const u_char *cp, const u_int len _U_)
+{
+	ND_PRINT("%s", GET_U_1(cp) ? "full": "half");
+}
+
+/* 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.
+*/
+static void
+cdp_print_ata186(netdissect_options *ndo,
+                 const u_char *cp, const u_int len)
+{
+	if (len == 2)
+		ND_PRINT("unknown 0x%04x", GET_BE_U_2(cp));
+	else
+		ND_PRINT("app %u, vlan %u", GET_U_1(cp), GET_BE_U_2(cp + 1));
+}
+
+static void
+cdp_print_mtu(netdissect_options *ndo,
+              const u_char *cp, const u_int len _U_)
+{
+	ND_PRINT("%u bytes", GET_BE_U_4(cp));
+}
+
+static void
+cdp_print_uint8x(netdissect_options *ndo,
+                 const u_char *cp, const u_int len _U_)
+{
+	ND_PRINT("0x%02x", GET_U_1(cp));
+}
+
+static void
+cdp_print_phys_loc(netdissect_options *ndo,
+                   const u_char *cp, const u_int len)
+{
+	ND_PRINT("0x%02x", GET_U_1(cp));
+	if (len > 1) {
+		ND_PRINT("/");
+		(void)nd_printn(ndo, cp + 1, len - 1, NULL);
+	}
+}
+
+struct cdp_tlvinfo {
+	const char *name;
+	void (*printer)(netdissect_options *ndo, const u_char *, u_int);
+	int min_len, max_len;
+};
+
+#define T_DEV_ID 0x01
+#define T_MAX 0x17
+static const struct cdp_tlvinfo cdptlvs[T_MAX + 1] = {
+	/* 0x00 */
+	[ T_DEV_ID ] = { "Device-ID", cdp_print_string, -1, -1 },
+	[ 0x02 ] = { "Address", cdp_print_addr, -1, -1 },
+	[ 0x03 ] = { "Port-ID", cdp_print_string, -1, -1 },
+	[ 0x04 ] = { "Capability", cdp_print_capability, 4, 4 },
+	[ 0x05 ] = { "Version String", cdp_print_version, -1, -1 },
+	[ 0x06 ] = { "Platform", cdp_print_string, -1, -1 },
+	[ 0x07 ] = { "Prefixes", cdp_print_prefixes, -1, -1 },
+	/* not documented */
+	[ 0x08 ] = { "Protocol-Hello option", NULL, -1, -1 },
+	/* CDPv2 */
+	[ 0x09 ] = { "VTP Management Domain", cdp_print_string, -1, -1 },
+	/* CDPv2 */
+	[ 0x0a ] = { "Native VLAN ID", cdp_print_uint16, 2, 2 },
+	/* CDPv2 */
+	[ 0x0b ] = { "Duplex", cdp_print_duplex, 1, 1 },
+	/* 0x0c */
+	/* 0x0d */
+	/* incomplete doc. */
+	[ 0x0e ] = { "ATA-186 VoIP VLAN assignment", cdp_print_ata186, 3, 3 },
+	/* incomplete doc. */
+	[ 0x0f ] = { "ATA-186 VoIP VLAN request", cdp_print_ata186, 2, 3 },
+	/* not documented */
+	[ 0x10 ] = { "power consumption", cdp_print_power, 1, 3 },
+	/* not documented */
+	[ 0x11 ] = { "MTU", cdp_print_mtu, 4, 4 },
+	/* not documented */
+	[ 0x12 ] = { "AVVID trust bitmap", cdp_print_uint8x, 1, 1 },
+	/* not documented */
+	[ 0x13 ] = { "AVVID untrusted ports CoS", cdp_print_uint8x, 1, 1 },
+	/* not documented */
+	[ 0x14 ] = { "System Name", cdp_print_string, -1, -1 },
+	/* not documented */
+	[ 0x15 ] = { "System Object ID (not decoded)", NULL, -1, -1 },
+	[ 0x16 ] = { "Management Addresses", cdp_print_addr, 4, -1 },
+	/* not documented */
+	[ 0x17 ] = { "Physical Location", cdp_print_phys_loc, 1, -1 },
+};
+
+void
+cdp_print(netdissect_options *ndo,
+          const u_char *tptr, u_int length)
+{
+	u_int orig_length = length;
+	uint16_t checksum;
+
+	ndo->ndo_protocol = "cdp";
+
+	if (length < CDP_HEADER_LEN) {
+		ND_PRINT(" (packet length %u < %u)", length, CDP_HEADER_LEN);
+		goto invalid;
+	}
+	ND_PRINT("CDPv%u, ttl: %us",
+	         GET_U_1(tptr + CDP_HEADER_VERSION_OFFSET),
+	         GET_U_1(tptr + CDP_HEADER_TTL_OFFSET));
+	checksum = GET_BE_U_2(tptr + CDP_HEADER_CHECKSUM_OFFSET);
+	if (ndo->ndo_vflag)
+		ND_PRINT(", checksum: 0x%04x (unverified), length %u",
+		         checksum, orig_length);
+	tptr += CDP_HEADER_LEN;
+	length -= CDP_HEADER_LEN;
+
+	while (length) {
+		u_int type, len;
+		const struct cdp_tlvinfo *info;
+		const char *name;
+		u_char covered = 0;
+
+		if (length < CDP_TLV_HEADER_LEN) {
+			ND_PRINT(" (remaining packet length %u < %u)",
+			         length, CDP_TLV_HEADER_LEN);
+			goto invalid;
+		}
+		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 */
+		info = type <= T_MAX ? &cdptlvs[type] : NULL;
+		name = (info && info->name) ? info->name : "unknown field type";
+		if (len < CDP_TLV_HEADER_LEN) {
+			if (ndo->ndo_vflag)
+				ND_PRINT("\n\t%s (0x%02x), TLV length: %u byte%s (too short)",
+				         name, type, len, PLURAL_SUFFIX(len));
+			else
+				ND_PRINT(", %s TLV length %u too short",
+				         name, len);
+			goto invalid;
+		}
+		if (len > length) {
+			ND_PRINT(" (TLV length %u > %u)", len, length);
+			goto invalid;
+		}
+		tptr += CDP_TLV_HEADER_LEN;
+		length -= CDP_TLV_HEADER_LEN;
+		len -= CDP_TLV_HEADER_LEN;
+
+		/* In non-verbose mode just print Device-ID. */
+		if (!ndo->ndo_vflag && type == T_DEV_ID)
+			ND_PRINT(", Device-ID ");
+		else if (ndo->ndo_vflag)
+			ND_PRINT("\n\t%s (0x%02x), value length: %u byte%s: ",
+			         name, type, len, PLURAL_SUFFIX(len));
+
+		if (info) {
+			if ((info->min_len > 0 && len < (unsigned)info->min_len) ||
+			    (info->max_len > 0 && len > (unsigned)info->max_len))
+				ND_PRINT(" (malformed TLV)");
+			else if (ndo->ndo_vflag || type == T_DEV_ID) {
+				if (info->printer)
+					info->printer(ndo, tptr, len);
+				else
+					ND_TCHECK_LEN(tptr, len);
+				/*
+				 * When the type is defined without a printer,
+				 * do not print the hex dump.
+				 */
+				covered = 1;
+			}
+		}
+
+		if (!covered) {
+			ND_TCHECK_LEN(tptr, len);
+			print_unknown_data(ndo, tptr, "\n\t  ", len);
+		}
+		tptr += len;
+		length -= len;
+	}
+	if (ndo->ndo_vflag < 1)
+		ND_PRINT(", length %u", orig_length);
+
+	return;
+invalid:
+	nd_print_invalid(ndo);
+	ND_TCHECK_LEN(tptr, length);
+}
+
+/*
+ * 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 void
+cdp_print_addr(netdissect_options *ndo,
+               const u_char * p, u_int l)
+{
+	u_int num;
+	static const u_char prot_ipv6[] = {
+		0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd
+	};
+
+	if (l < 4) {
+		ND_PRINT(" (not enough space for num)");
+		goto invalid;
+	}
+	num = GET_BE_U_4(p);
+	p += 4;
+	l -= 4;
+
+	while (num) {
+		u_int pt, pl, al;
+
+		if (l < 2) {
+			ND_PRINT(" (not enough space for PT+PL)");
+			goto invalid;
+		}
+		pt = GET_U_1(p);		/* type of "protocol" field */
+		pl = GET_U_1(p + 1);	/* length of "protocol" field */
+		p += 2;
+		l -= 2;
+
+		if (l < pl + 2) {
+			ND_PRINT(" (not enough space for P+AL)");
+			goto invalid;
+		}
+		/* Skip the protocol for now. */
+		al = GET_BE_U_2(p + pl);	/* address length */
+
+		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),
+			 * address length = 4
+			 */
+			p += pl + 2;
+			l -= pl + 2;
+			/* p is just beyond al now. */
+			if (l < al) {
+				ND_PRINT(" (not enough space for A)");
+				goto invalid;
+			}
+			ND_PRINT("IPv4 (%u) %s", num, GET_IPADDR_STRING(p));
+			p += al;
+			l -= al;
+		}
+		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 += pl + 2;
+			l -= pl + 2;
+			/* p is just beyond al now. */
+			if (l < al) {
+				ND_PRINT(" (not enough space for A)");
+				goto invalid;
+			}
+			ND_PRINT("IPv6 (%u) %s", num, GET_IP6ADDR_STRING(p));
+			p += al;
+			l -= al;
+		}
+		else {
+			/*
+			 * Generic case: just print raw data
+			 */
+			ND_PRINT("pt=0x%02x, pl=%u, pb=", pt, pl);
+			while (pl != 0) {
+				ND_PRINT(" %02x", GET_U_1(p));
+				p++;
+				l--;
+				pl--;
+			}
+			ND_PRINT(", al=%u, a=", al);
+			p += 2;
+			l -= 2;
+			/* p is just beyond al now. */
+			if (l < al) {
+				ND_PRINT(" (not enough space for A)");
+				goto invalid;
+			}
+			while (al != 0) {
+				ND_PRINT(" %02x", GET_U_1(p));
+				p++;
+				l--;
+				al--;
+			}
+		}
+		num--;
+		if (num)
+			ND_PRINT(" ");
+	}
+	if (l)
+		ND_PRINT(" (%u bytes of stray data)", l);
+	return;
+
+invalid:
+	ND_TCHECK_LEN(p, l);
+}
+
+static void
+cdp_print_prefixes(netdissect_options *ndo,
+                   const u_char * p, u_int l)
+{
+	if (l % 5) {
+		ND_PRINT(" [length %u is not a multiple of 5]", l);
+		goto invalid;
+	}
+
+	ND_PRINT(" IPv4 Prefixes (%u):", l / 5);
+
+	while (l > 0) {
+		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;
+	}
+	return;
+
+invalid:
+	ND_TCHECK_LEN(p, l);
+}