Stuart Stanley's ISIS dissection support.

svn path=/trunk/; revision=1340

1 files changed, 486 insertions, 0 deletions

diff --git a/packet-isis-snp.c b/packet-isis-snp.c
new file mode 100644
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+++ b/packet-isis-snp.c
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+/* packet-isis-snp.c
+ * Routines for decoding isis complete & partial SNP and their payload
+ *
+ * $Id: packet-isis-snp.c,v 1.1 1999/12/15 04:34:19 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-lsp.h"
+#include "packet-isis-snp.h"
+
+/* csnp packets */
+static int proto_isis_csnp = -1;
+static int hf_isis_csnp_pdu_length = -1;
+static gint ett_isis_csnp = -1;
+static gint ett_isis_csnp_lsp_entries = -1;
+static gint ett_isis_csnp_authentication = -1;
+static gint ett_isis_csnp_clv_unknown = -1;
+
+/* psnp packets */
+static int proto_isis_psnp = -1;
+static int hf_isis_psnp_pdu_length = -1;
+static gint ett_isis_psnp = -1;
+static gint ett_isis_psnp_lsp_entries = -1;
+static gint ett_isis_psnp_authentication = -1;
+static gint ett_isis_psnp_clv_unknown = -1;
+
+static void dissect_snp_lsp_entries(const u_char *pd, int offset,
+		guint length, frame_data *fd, proto_tree *tree );
+static void dissect_l1_snp_authentication_clv(const u_char *pd, int offset,
+		guint length, frame_data *fd, proto_tree *tree );
+static void dissect_l2_snp_authentication_clv(const u_char *pd, int offset,
+		guint length, frame_data *fd, proto_tree *tree );
+
+static const isis_clv_handle_t clv_l1_csnp_opts[] = {
+	{
+		ISIS_CLV_L1_CSNP_LSP_ENTRIES,
+		"LSP entries",
+		&ett_isis_csnp_lsp_entries,
+		dissect_snp_lsp_entries
+	},
+	{
+		ISIS_CLV_L1_CSNP_AUTHENTICATION_NS,
+		"Authentication(non spec)",
+		&ett_isis_csnp_authentication,
+		dissect_l1_snp_authentication_clv
+	},
+	{
+		ISIS_CLV_L1_CSNP_AUTHENTICATION,
+		"Authentication",
+		&ett_isis_csnp_authentication,
+		dissect_l1_snp_authentication_clv
+	},
+	{
+		0, "", NULL, NULL 
+	}
+};
+
+static const isis_clv_handle_t clv_l2_csnp_opts[] = {
+	{
+		ISIS_CLV_L2_CSNP_LSP_ENTRIES,
+		"LSP entries",
+		&ett_isis_csnp_lsp_entries,
+		dissect_snp_lsp_entries
+	},
+	{
+		ISIS_CLV_L2_CSNP_AUTHENTICATION_NS,
+		"Authentication(non spec)",
+		&ett_isis_csnp_authentication,
+		dissect_l2_snp_authentication_clv
+	},
+	{
+		ISIS_CLV_L2_CSNP_AUTHENTICATION,
+		"Authentication",
+		&ett_isis_csnp_authentication,
+		dissect_l2_snp_authentication_clv
+	},
+	{
+		0, "", NULL, NULL 
+	}
+};
+
+static const isis_clv_handle_t clv_l1_psnp_opts[] = {
+	{
+		ISIS_CLV_L1_PSNP_LSP_ENTRIES,
+		"LSP entries",
+		&ett_isis_psnp_lsp_entries,
+		dissect_snp_lsp_entries
+	},
+	{
+		ISIS_CLV_L1_PSNP_AUTHENTICATION_NS,
+		"Authentication(non spec)",
+		&ett_isis_psnp_authentication,
+		dissect_l1_snp_authentication_clv
+	},
+	{
+		ISIS_CLV_L1_PSNP_AUTHENTICATION,
+		"Authentication",
+		&ett_isis_psnp_authentication,
+		dissect_l1_snp_authentication_clv
+	},
+	{
+		0, "", NULL, NULL 
+	}
+};
+
+static const isis_clv_handle_t clv_l2_psnp_opts[] = {
+	{
+		ISIS_CLV_L2_PSNP_LSP_ENTRIES,
+		"LSP entries",
+		&ett_isis_psnp_lsp_entries,
+		dissect_snp_lsp_entries
+	},
+	{
+		ISIS_CLV_L2_PSNP_AUTHENTICATION,
+		"Authentication",
+		&ett_isis_psnp_authentication,
+		dissect_l2_snp_authentication_clv
+	},
+	{
+		ISIS_CLV_L2_PSNP_AUTHENTICATION_NS,
+		"Authentication(non spec)",
+		&ett_isis_psnp_authentication,
+		dissect_l2_snp_authentication_clv
+	},
+	{
+		0, "", NULL, NULL 
+	}
+};
+/*
+ * Name: dissect_snp_payload()
+ *
+ * Description:
+ *	All the snp packets use a common payload format.  We have up
+ *	to n entries (based on length), which are made of:
+ *		2 : remaining life time
+ *		8 : lsp id
+ *		4 : sequence number
+ *		2 : checksum
+ *
+ * Input:
+ *	u_char * : packet data
+ *	int : offset into packet data where we are.
+ *	int : length of payload to decode.
+ *	frame_data * : frame data (complete frame)
+ *	proto_tree * : protocol display tree to fill out.  May be NULL
+ *
+ * Output:
+ *      void, but we will add to proto tree if !NULL.
+ */
+static void 
+dissect_snp_lsp_entries(const u_char *pd, int offset, guint length, 
+		frame_data *fd, proto_tree *tree ) {
+	isis_snp_t *ps;
+
+	ps = (isis_snp_t *) &pd[offset];
+	while ( length > 0 ) {
+		if ( length < sizeof(isis_psnp_t) ) {
+			isis_dissect_unknown(offset, length, tree, fd,
+				"Short SNP header entry (%d vs %d)", length,
+				sizeof(isis_psnp_t) );
+			return;
+		}
+		
+		proto_tree_add_text(tree, offset, 2, "Remaining life: %d",
+			pntohs(&ps->isis_snp_remaining_lifetime));
+		isis_lsp_decode_lsp_id( "LSP ID", tree, offset + 2,
+			&ps->isis_snp_lsp_id );
+		proto_tree_add_text(tree, offset+10, 4, 
+			"LSP Sequence Number: 0x%04x",
+			pntohl(&ps->isis_snp_sequence_number));
+		proto_tree_add_text(tree, offset+14, 2, 
+			"LSP checksum: 0x%02x",
+			pntohl(&ps->isis_snp_checksum));
+		length -= sizeof ( isis_snp_t );
+		offset += sizeof ( isis_snp_t );
+		ps++;
+	}
+
+}
+
+/*
+ * Name: isis_dissect_isis_csnp()
+ *
+ * Description:
+ *	Tear apart a L1 or L2 CSNP header and then call into payload dissect
+ *	to pull apart the lsp id payload.
+ *
+ * Input:
+ *	int : type (l1 csnp, l2 csnp)
+ *	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
+ *
+ * Output:
+ *      void, but we will add to proto tree if !NULL.
+ */
+void 
+isis_dissect_isis_csnp(int type, int header_length, const u_char *pd, 
+		int offset, frame_data *fd, proto_tree *tree){
+	isis_csnp_t	*ilp;
+	proto_item	*ti;
+	proto_tree	*csnp_tree = NULL;
+	int		hlen;
+	int 		len;
+
+	hlen = sizeof(*ilp);
+
+	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;
+	}
+	
+	ilp = (isis_csnp_t *) &pd[offset];
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_isis_csnp,
+			offset, fd->cap_len - offset, NULL);
+		csnp_tree = proto_item_add_subtree(ti, ett_isis_csnp);
+		proto_tree_add_item(csnp_tree, hf_isis_csnp_pdu_length,
+			offset, 2, pntohs(&ilp->isis_csnp_pdu_length));
+		proto_tree_add_text(csnp_tree, offset + 2, 7, 
+			"Source id: %02x%02x.%02x%02x.%02x%02x.%02x",
+				ilp->isis_csnp_source_id[0],
+				ilp->isis_csnp_source_id[1],
+				ilp->isis_csnp_source_id[2],
+				ilp->isis_csnp_source_id[3],
+				ilp->isis_csnp_source_id[4],
+				ilp->isis_csnp_source_id[5],
+				ilp->isis_csnp_source_id[6] );
+		isis_lsp_decode_lsp_id( "Start LSP id", csnp_tree, offset + 9,
+			&ilp->isis_csnp_start_lsp_id );
+		isis_lsp_decode_lsp_id( "End LSP id", csnp_tree, offset + 17,
+			&ilp->isis_csnp_start_lsp_id );
+	}
+
+	offset += hlen;
+	len = pntohs(&ilp->isis_csnp_pdu_length);
+	len -= header_length;
+	if (len < 0) {
+		return;
+	}
+	/* Call into payload dissector */
+	if (type == ISIS_TYPE_L1_CSNP ) {
+		isis_dissect_clvs ( clv_l1_csnp_opts, len, pd, offset, fd,
+			csnp_tree, ett_isis_csnp_clv_unknown );
+	} else {
+		isis_dissect_clvs ( clv_l2_csnp_opts, len, pd, offset, fd,
+			csnp_tree, ett_isis_csnp_clv_unknown );
+	}
+}
+
+/*
+ * Name: isis_dissect_isis_psnp()
+ *
+ * Description:
+ *	Tear apart a L1 or L2 PSNP header and then call into payload dissect
+ *	to pull apart the lsp id payload.
+ *
+ * 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
+ *
+ * Output:
+ *      void, but we will add to proto tree if !NULL.
+ */
+void 
+isis_dissect_isis_psnp(int type, int header_length, const u_char *pd, 
+		int offset, frame_data *fd, proto_tree *tree){
+	isis_psnp_t	*ilp;
+	proto_item	*ti;
+	proto_tree	*psnp_tree = NULL;
+	int		hlen;
+	int 		len;
+
+	hlen = sizeof(*ilp);
+
+	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;
+	}
+	
+	ilp = (isis_psnp_t *) &pd[offset];
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_isis_psnp,
+			offset, fd->cap_len - offset, NULL);
+		psnp_tree = proto_item_add_subtree(ti, ett_isis_psnp);
+		proto_tree_add_item(psnp_tree, hf_isis_psnp_pdu_length,
+			offset, 2, pntohs(&ilp->isis_psnp_pdu_length));
+		proto_tree_add_text(psnp_tree, offset + 2, 7, 
+			"Source id: %02x%02x.%02x%02x.%02x%02x.%02x",
+				ilp->isis_psnp_source_id[0],
+				ilp->isis_psnp_source_id[1],
+				ilp->isis_psnp_source_id[2],
+				ilp->isis_psnp_source_id[3],
+				ilp->isis_psnp_source_id[4],
+				ilp->isis_psnp_source_id[5],
+				ilp->isis_psnp_source_id[6] );
+	}
+
+	offset += hlen;
+	len = pntohs(&ilp->isis_psnp_pdu_length);
+	len -= header_length;
+	if (len < 0) {
+		isis_dissect_unknown(offset, header_length, tree, fd,
+			"packet header length %d went beyond packet",
+			header_length );
+		return;
+	}
+	/* Call into payload dissector */
+	if (type == ISIS_TYPE_L1_CSNP ) {
+		isis_dissect_clvs ( clv_l1_csnp_opts, len, pd, offset, fd,
+			psnp_tree, ett_isis_psnp_clv_unknown );
+	} else {
+		isis_dissect_clvs ( clv_l2_csnp_opts, len, pd, offset, fd,
+			psnp_tree, ett_isis_psnp_clv_unknown );
+	}
+}
+
+/*
+ * Name: dissect_L1_snp_authentication_clv()
+ *
+ * Description:
+ *	Decode for a lsp packets authenticaion clv.  Calls into the
+ *	clv common one.  An auth inside a L1 SNP is a per area 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_l1_snp_authentication_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 area authentication" );
+}
+
+/*
+ * Name: dissect_l2_authentication_clv()
+ *
+ * Description:
+ *	Decode for a lsp packets authenticaion clv.  Calls into the
+ *	clv common one.  An auth inside a L2 LSP is a per domain 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_l2_snp_authentication_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 domain authentication" );
+}
+
+/*
+ * Name: proto_register_isis_csnp()
+ *
+ * Description: 
+ *	Register our protocol sub-sets with protocol manager.
+ *	NOTE: this procedure is autolinked by the makefile process that
+ *		builds register.c
+ *
+ * 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
+ *
+ * Output:
+ *      void, but we will add to proto tree if !NULL.
+ */
+void 
+proto_register_isis_csnp(void) {
+	static hf_register_info hf[] = {
+		{ &hf_isis_csnp_pdu_length,
+		{ "PDU length",		"isis_csnp.pdu_length", FT_UINT16, 
+		  BASE_DEC, NULL, 0x0, "" }},
+	};
+	static gint *ett[] = {
+		&ett_isis_csnp,
+		&ett_isis_csnp_lsp_entries,
+		&ett_isis_csnp_authentication,
+		&ett_isis_csnp_clv_unknown,
+	};
+
+	proto_isis_csnp = proto_register_protocol("ISIS csnp", "ISIS-csnp");
+	proto_register_field_array(proto_isis_csnp, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+
+
+/*
+ * Name: proto_register_isis_psnp()
+ *
+ * Description: 
+ *	Register our protocol sub-sets with protocol manager.
+ *	NOTE: this procedure is autolinked by the makefile process that
+ *		builds register.c
+ *
+ * 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
+ *
+ * Output:
+ *      void, but we will add to proto tree if !NULL.
+ */
+void 
+proto_register_isis_psnp(void) {
+	static hf_register_info hf[] = {
+		{ &hf_isis_psnp_pdu_length,
+		{ "PDU length",		"isis_psnp.pdu_length", FT_UINT16, 
+		  BASE_DEC, NULL, 0x0, "" }},
+	};
+	static gint *ett[] = {
+		&ett_isis_psnp,
+		&ett_isis_psnp_lsp_entries,
+		&ett_isis_psnp_authentication,
+		&ett_isis_psnp_clv_unknown,
+	};
+
+	proto_isis_psnp = proto_register_protocol("ISIS psnp", "ISIS-psnp");
+	proto_register_field_array(proto_isis_psnp, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+