Stuart Stanley's ISIS dissection support.

svn path=/trunk/; revision=1340

1 files changed, 580 insertions, 0 deletions

diff --git a/packet-isis-hello.c b/packet-isis-hello.c
new file mode 100644
index 0000000000..00b530f342
--- /dev/null
+++ b/packet-isis-hello.c
@@ -0,0 +1,580 @@
+/* packet-isis-hello.c
+ * Routines for decoding isis hello packets and their CLVs
+ *
+ * $Id: packet-isis-hello.c,v 1.1 1999/12/15 04:34:17 guy Exp $
+ * Stuart Stanley <stuarts@mxmail.net>
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@zing.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <glib.h>
+#include "packet.h"
+#include "packet-isis.h"
+#include "packet-isis-clv.h"
+#include "packet-isis-hello.h"
+
+/* hello packets */
+static int proto_isis_hello = -1;
+static int hf_isis_hello_circuit_reserved = -1;
+static int hf_isis_hello_source_id = -1;
+static int hf_isis_hello_holding_timer = -1;
+static int hf_isis_hello_pdu_length = -1;
+static int hf_isis_hello_priority_reserved = -1;
+static int hf_isis_hello_lan_id = -1;
+static int hf_isis_hello_local_circuit_id = -1;
+static int hf_isis_hello_clv_ipv4_int_addr = -1;
+
+static gint ett_isis_hello = -1;
+static gint ett_isis_hello_clv_area_addr = -1;
+static gint ett_isis_hello_clv_is_neighbors = -1;
+static gint ett_isis_hello_clv_padding = -1;
+static gint ett_isis_hello_clv_unknown = -1;
+static gint ett_isis_hello_clv_nlpid = -1;
+static gint ett_isis_hello_clv_auth = -1;
+static gint ett_isis_hello_clv_ipv4_int_addr = -1;
+
+static const value_string isis_hello_circuit_type_vals[] = {
+	{ ISIS_HELLO_TYPE_RESERVED,	"Reserved 0 (discard PDU)"},
+	{ ISIS_HELLO_TYPE_LEVEL_1,	"Level 1 only"},
+	{ ISIS_HELLO_TYPE_LEVEL_2,	"Level 2 only"},
+	{ ISIS_HELLO_TYPE_LEVEL_12,	"Level 1 and 2"},
+	{ 0,		NULL} };
+
+/* 
+ * Predclare dissectors for use in clv dissection.
+ */
+static void dissect_hello_area_address_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree);
+static void dissect_hello_is_neighbors_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree);
+static void dissect_hello_padding_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree);
+static void dissect_hello_nlpid_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree);
+static void dissect_hello_ip_int_addr_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree);
+static void dissect_hello_auth_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree);
+
+static const isis_clv_handle_t clv_l1_hello_opts[] = {
+	{
+		ISIS_CLV_L1H_AREA_ADDRESS,
+		"Area address(es)",
+		&ett_isis_hello_clv_area_addr,
+		dissect_hello_area_address_clv
+	},
+	{
+		ISIS_CLV_L1H_IS_NEIGHBORS,
+		"IS Neighbor(s)",
+		&ett_isis_hello_clv_is_neighbors,
+		dissect_hello_is_neighbors_clv
+	},
+	{
+		ISIS_CLV_L1H_PADDING,
+		"Padding",
+		&ett_isis_hello_clv_padding,
+		dissect_hello_padding_clv
+	},
+	{
+		ISIS_CLV_L1H_NLPID,
+		"NLPID",
+		&ett_isis_hello_clv_nlpid,
+		dissect_hello_nlpid_clv
+	},
+	{
+		ISIS_CLV_L1H_IP_INTERFACE_ADDR,
+		"IP Interface address(es)",
+		&ett_isis_hello_clv_ipv4_int_addr,
+		dissect_hello_ip_int_addr_clv
+	},
+	{
+		ISIS_CLV_L1H_AUTHENTICATION_NS,
+		"Authentication(non spec)",
+		&ett_isis_hello_clv_auth,
+		dissect_hello_auth_clv
+	},
+	{
+		ISIS_CLV_L1H_AUTHENTICATION,
+		"Authentication",
+		&ett_isis_hello_clv_auth,
+		dissect_hello_auth_clv
+	},
+	{
+		0,
+		"",
+		NULL,
+		NULL
+	}
+};
+
+static const isis_clv_handle_t clv_l2_hello_opts[] = {
+	{
+		ISIS_CLV_L2H_AREA_ADDRESS,
+		"Area address(es)",
+		&ett_isis_hello_clv_area_addr,
+		dissect_hello_area_address_clv
+	},
+	{
+		ISIS_CLV_L2H_IS_NEIGHBORS,
+		"IS Neighbor(s)",
+		&ett_isis_hello_clv_is_neighbors,
+		dissect_hello_is_neighbors_clv
+	},
+	{
+		ISIS_CLV_L2H_PADDING,
+		"Padding",
+		&ett_isis_hello_clv_padding,
+		dissect_hello_padding_clv
+	},
+	{
+		ISIS_CLV_L2H_NLPID,
+		"NLPID",
+		&ett_isis_hello_clv_nlpid,
+		dissect_hello_nlpid_clv
+	},
+	{
+		ISIS_CLV_L2H_IP_INTERFACE_ADDR,
+		"IP Interface address(es)",
+		&ett_isis_hello_clv_ipv4_int_addr,
+		dissect_hello_ip_int_addr_clv
+	},
+	{
+		ISIS_CLV_L2H_AUTHENTICATION_NS,
+		"Authentication(non spec)",
+		&ett_isis_hello_clv_auth,
+		dissect_hello_auth_clv
+	},
+	{
+		ISIS_CLV_L2H_AUTHENTICATION,
+		"Authentication",
+		&ett_isis_hello_clv_auth,
+		dissect_hello_auth_clv
+	},
+	{
+		0,
+		"",
+		NULL,
+		NULL
+	}
+};
+
+static const isis_clv_handle_t clv_ptp_hello_opts[] = {
+	{
+		ISIS_CLV_PTP_AREA_ADDRESS,
+		"Area address(es)",
+		&ett_isis_hello_clv_area_addr,
+		dissect_hello_area_address_clv
+	},
+	{
+		ISIS_CLV_PTP_PADDING,
+		"Padding",
+		&ett_isis_hello_clv_padding,
+		dissect_hello_padding_clv
+	},
+	{
+		ISIS_CLV_PTP_NLPID,
+		"NLPID",
+		&ett_isis_hello_clv_nlpid,
+		dissect_hello_nlpid_clv
+	},
+	{
+		ISIS_CLV_PTP_IP_INTERFACE_ADDR,
+		"IP Interface address(es)",
+		&ett_isis_hello_clv_ipv4_int_addr,
+		dissect_hello_ip_int_addr_clv
+	},
+	{
+		ISIS_CLV_PTP_AUTHENTICATION_NS,
+		"Authentication(non spec)",
+		&ett_isis_hello_clv_auth,
+		dissect_hello_auth_clv
+	},
+	{
+		ISIS_CLV_PTP_AUTHENTICATION,
+		"Authentication",
+		&ett_isis_hello_clv_auth,
+		dissect_hello_auth_clv
+	},
+	{
+		0,
+		"",
+		NULL,
+		NULL
+	}
+};
+
+/*
+ * Name: dissect_hello_nlpid_clv()
+ *
+ * Description:
+ *	Decode for a hello packets NLPID clv.  Calls into the
+ *	clv common one.
+ *
+ * Input:
+ *	u_char * : packet data
+ *	int : current offset into packet data
+ *	guint : length of this clv
+ *	frame_data * : frame data
+ *	proto_tree * : proto tree to build on (may be null)
+ *
+ * Output:
+ *	void, will modify proto_tree if not null.
+ */
+static void 
+dissect_hello_nlpid_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree) {
+	isis_dissect_nlpid_clv(pd, offset, length, fd, tree );
+}
+
+/*
+ * Name: dissect_hello_ip_int_addr_clv()
+ *
+ * Description:
+ *	Decode for a hello packets ip interface addr clv.  Calls into the
+ *	clv common one.
+ *
+ * Input:
+ *	u_char * : packet data
+ *	int : current offset into packet data
+ *	guint : length of this clv
+ *	frame_data * : frame data
+ *	proto_tree * : proto tree to build on (may be null)
+ *
+ * Output:
+ *	void, will modify proto_tree if not null.
+ */
+static void 
+dissect_hello_ip_int_addr_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree) {
+	isis_dissect_ip_int_clv(pd, offset, length, fd, tree, 
+		hf_isis_hello_clv_ipv4_int_addr );
+}
+
+/*
+ * Name: dissect_hello_auth_clv()
+ *
+ * Description:
+ *	Decode for a hello packets authenticaion clv.  Calls into the
+ *	clv common one.  An auth inside a hello packet is a perlink
+ *	password.
+ *
+ * Input:
+ *	u_char * : packet data
+ *	int : current offset into packet data
+ *	guint : length of this clv
+ *	frame_data * : frame data
+ *	proto_tree * : proto tree to build on (may be null)
+ *
+ * Output:
+ *	void, will modify proto_tree if not null.
+ */
+static void 
+dissect_hello_auth_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree) {
+	isis_dissect_authentication_clv(pd, offset, length, fd, tree, 
+		"Per Link authentication" );
+}
+
+/*
+ * Name: dissect_hello_area_address_clv()
+ *
+ * Description:
+ *	Decode for a hello packets area address clv.  Calls into the
+ *	clv common one.
+ *
+ * Input:
+ *	u_char * : packet data
+ *	int : current offset into packet data
+ *	guint : length of this clv
+ *	frame_data * : frame data
+ *	proto_tree * : proto tree to build on (may be null)
+ *
+ * Output:
+ *	void, will modify proto_tree if not null.
+ */
+static void 
+dissect_hello_area_address_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree) {
+	isis_dissect_area_address_clv(pd, offset, length, fd, tree );
+}
+
+/*
+ * Name: isis_dissect_is_neighbors_clv()
+ * 
+ * Description:
+ *	Take apart a IS neighbor packet.  A neighbor is n 6 byte packets.
+ *	(they tend to be an 802.3 MAC address, but its not required).
+ *
+ * Input:
+ *	u_char * : packet data
+ *	int : offset into packet data where we are.
+ *	guint : length of clv we are decoding
+ *	frame_data * : frame data (complete frame)
+ *	proto_tree * : protocol display tree to fill out.  May be NULL
+ *	gint : tree id to use for proto tree.
+ * 
+ * Output:
+ *	void, but we will add to proto tree if !NULL.
+ */
+void 
+dissect_hello_is_neighbors_clv(const u_char *pd, int offset, 
+		guint length, frame_data *fd, proto_tree *tree ) {
+	while ( length > 0 ) {
+		if (length<6) {
+			isis_dissect_unknown(offset, length, tree, fd, 
+				"short is neighbor (%d vs 6)", length );
+			return;
+		}
+		/* 
+		 * Lets turn the area address into "standard" 0000.0000.etc
+		 * format string.  
+		 */
+		if ( tree ) {
+			proto_tree_add_text ( tree, offset, 6, 
+				"IS Neighbor: %02x%02x.%02x%02x.%02x%02x",
+				pd[offset], pd[offset+1], pd[offset+2],
+				pd[offset+3], pd[offset+3], pd[offset+4] );
+		}
+		offset += 6;
+		length -= 6;
+	}
+}
+
+
+/*
+ * Name: dissect_hello_padding_clv()
+ *
+ * Description:
+ *	Decode for a hello packet's padding clv.  Padding does nothing,
+ *	so we just return.
+ *
+ * Input:
+ *	u_char * : packet data
+ *	int : current offset into packet data
+ *	guint : length of this clv
+ *	frame_data * : frame data
+ *	proto_tree * : proto tree to build on (may be null)
+ *
+ * Output:
+ *	void
+ */
+static void 
+dissect_hello_padding_clv(const u_char *pd, int offset, guint length, 
+		frame_data *fd, proto_tree *tree) {
+	/* nothing to do here! */
+}
+
+/*
+ * Name: isis_dissect_isis_hello()
+ * 
+ * Description:
+ *	This procedure rips apart the various types of ISIS hellos.  L1H and
+ *	L2H's are identicle for the most part, while the PTP hello has
+ *	a shorter header.
+ *
+ * Input:
+ *	int : hello type, alla packet-isis.h ISIS_TYPE_* values
+ *	int : header length of packet.
+ *	u_char * : packet data
+ *	int offset : our offset into packet data.
+ *	frame_data * : frame data
+ *	proto_tree * : protocol display tree to add to.  May be NULL.
+ *
+ * Output:
+ *	void, will modify proto_tree if not NULL.
+ */	
+void 
+isis_dissect_isis_hello(int hello_type, int header_length, 
+		const u_char *pd, int offset, frame_data *fd, proto_tree *tree){
+	isis_hello_t	*ihp;
+	proto_item	*ti;
+	proto_tree	*hello_tree = NULL;
+	int 		len;
+	int		hlen;
+
+	if (hello_type == ISIS_TYPE_PTP_HELLO) {
+		hlen = sizeof(*ihp) - 6;	/* make length correct */
+	} else {
+		hlen = sizeof(*ihp);
+	}
+
+	if (fd->cap_len < (offset + hlen)) {
+		isis_dissect_unknown(offset, hlen, tree, fd,
+			"not enough capture data for header (%d vs %d)",
+			hlen, offset - fd->cap_len);
+		return;
+	}
+
+	ihp = (isis_hello_t *) &pd[offset];	
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_isis_hello,
+			offset, fd->cap_len - offset, NULL);
+		hello_tree = proto_item_add_subtree(ti, ett_isis_hello);
+		proto_tree_add_item_format(hello_tree, 
+			hf_isis_hello_circuit_reserved,
+			offset, 1, ihp->isis_hello_circuit_reserved,
+			"Circuit type: %s, reserved(0x%02x == 0)",
+				val_to_str(ihp->isis_hello_circuit, 
+					isis_hello_circuit_type_vals,
+					"Unknown (0x%x)"),
+				ihp->isis_hello_creserved
+			);
+
+		proto_tree_add_item_format(hello_tree, hf_isis_hello_lan_id,
+			offset + 1, 6, ihp->isis_hello_source_id,
+			"Lan ID: %02x%02x.%02x%02x.%02x%02x",
+				ihp->isis_hello_lan_id[0],
+				ihp->isis_hello_lan_id[1],
+				ihp->isis_hello_lan_id[2],
+				ihp->isis_hello_lan_id[3],
+				ihp->isis_hello_lan_id[4],
+				ihp->isis_hello_lan_id[5]);
+		proto_tree_add_item(hello_tree, hf_isis_hello_holding_timer,
+			offset + 7, 2,pntohs(&ihp->isis_hello_holding_timer[0]));
+		proto_tree_add_item(hello_tree, hf_isis_hello_pdu_length,
+			offset + 9, 2,pntohs(&ihp->isis_hello_pdu_length[0]));
+		proto_tree_add_item_format(hello_tree, 
+			hf_isis_hello_priority_reserved,
+			offset + 11, 1, ihp->isis_hello_priority_reserved,
+			"Priority: %d, reserved(0x%02x == 0)",
+				ihp->isis_hello_priority,
+				ihp->isis_hello_preserved );
+		if (hello_type == ISIS_TYPE_PTP_HELLO) {
+			proto_tree_add_item_format(hello_tree, 
+				hf_isis_hello_local_circuit_id,
+				offset + 12, 1, ihp->isis_hello_lan_id[0] );
+		} else { 
+			proto_tree_add_item_format(hello_tree, 
+				hf_isis_hello_lan_id, offset + 12, 7, 
+				ihp->isis_hello_lan_id,
+				"Lan ID: %02x%02x.%02x%02x.%02x%02x-%02d",
+					ihp->isis_hello_lan_id[0],
+					ihp->isis_hello_lan_id[1],
+					ihp->isis_hello_lan_id[2],
+					ihp->isis_hello_lan_id[3],
+					ihp->isis_hello_lan_id[4],
+					ihp->isis_hello_lan_id[5],
+					ihp->isis_hello_lan_id[6]);
+		}
+	}
+
+	offset += hlen;
+	len = pntohs(&ihp->isis_hello_pdu_length[0]);
+	len -= header_length;
+	if (len < 0) {
+		isis_dissect_unknown(offset, header_length, tree, fd, 
+			"packet header length %d went beyond packet", 
+			header_length );
+		return;
+	}
+	/*
+	 * Now, we need to decode our CLVs.  We need to pass in
+	 * our list of valid ones!
+	 */
+	if (hello_type == ISIS_TYPE_L1_HELLO){
+		isis_dissect_clvs ( clv_l1_hello_opts, len, pd, offset, fd, 
+			hello_tree, ett_isis_hello_clv_unknown );
+	} else if (hello_type == ISIS_TYPE_L2_HELLO) {
+		isis_dissect_clvs ( clv_l2_hello_opts, len, pd, offset, fd, 
+			hello_tree, ett_isis_hello_clv_unknown );
+	} else {
+		isis_dissect_clvs ( clv_ptp_hello_opts, len, pd, offset, fd, 
+			hello_tree, ett_isis_hello_clv_unknown );
+	}
+}
+
+/*
+ * Name: proto_register_isis_hello()
+ *
+ * Description:
+ *	Register our protocol sub-sets with protocol manager.
+ *	NOTE: this procedure is autolinked by the makefile process that
+ *		builds register.c
+ *
+ * Input: 
+ *	void
+ *
+ * Output:
+ *	void
+ */
+void
+proto_register_isis_hello(void) {
+	static hf_register_info hf[] = {
+		{ &hf_isis_hello_circuit_reserved,
+		{ "Circuit type",		"", FT_UINT8, BASE_HEX, NULL, 
+		  0x0, "" }},
+
+		{ &hf_isis_hello_source_id,
+		{ "Source ID",		"isis_hello.source_id", FT_ETHER, 
+		  BASE_HEX, NULL, 0x0, "" }},
+
+		{ &hf_isis_hello_holding_timer,
+		{ "Holding timer",	"isis_hello.holding_timer", 
+		  FT_UINT16, BASE_DEC, NULL, 0x0, "" }},
+
+		{ &hf_isis_hello_pdu_length,
+		{ "PDU length",           "isis_hello.pdu_length", FT_UINT16, 
+		  BASE_DEC, NULL, 0x0, "" }},
+
+		{ &hf_isis_hello_priority_reserved,
+		 { "Priority",		"",FT_UINT8, BASE_DEC, NULL, 
+		  ISIS_HELLO_P_RESERVED_MASK, "" }},
+
+		{ &hf_isis_hello_lan_id,
+		{ "LAN ID", "", FT_STRING, BASE_DEC, NULL, 0x0, "" }},
+
+		{ &hf_isis_hello_local_circuit_id,
+		{ "Local circuit ID", "isis_hello.local_circuit_id", FT_UINT8,
+		   BASE_DEC, NULL, 0x0, "" }},
+
+		{ &hf_isis_hello_clv_ipv4_int_addr,
+		{ "IPv4 interface address", "", FT_IPv4,
+		   BASE_NONE, NULL, 0x0, "" }},
+
+	};
+	static gint *ett[] = {
+		&ett_isis_hello,
+		&ett_isis_hello_clv_area_addr,
+		&ett_isis_hello_clv_is_neighbors,
+		&ett_isis_hello_clv_padding,
+		&ett_isis_hello_clv_unknown,
+		&ett_isis_hello_clv_nlpid,
+		&ett_isis_hello_clv_auth,
+		&ett_isis_hello_clv_ipv4_int_addr,
+	};
+
+	proto_isis_hello = proto_register_protocol("ISIS hello", "ISIS-hello");
+	proto_register_field_array(proto_isis_hello, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+