From Viorel Suman: TALI (RFC 3094) support.

ATify Luca Deri's e-mail address.

svn path=/trunk/; revision=12016

1 files changed, 224 insertions, 0 deletions

diff --git a/epan/dissectors/packet-tali.c b/epan/dissectors/packet-tali.c
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+/* packet-tali.c
+ *
+ * Routines for Transport Adapter Layer Interface (TALI) version 1.0 dissection (RFC 3094)
+ *
+ * Copyright : 2004 Viorel Suman, <vsuman[AT]avmob.ro>
+ *             In association with Avalanche Mobile BV, http://www.avmob.com
+ *
+ * Dissector of a TALI (Transport Adapter Layer Interface) version 1.0, as defined by the
+ * Tekelec (www.tekelec.com) in RFC 3094, http://www.ietf.org/rfc/rfc3094.txt
+ *
+ * $Id$
+ *
+ * Refer to the AUTHORS file or the AUTHORS section in the man page
+ * for contacting the author(s) of this file.
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * 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
+
+#include <string.h>
+#include <glib.h>
+
+#include <epan/packet.h>
+#include "prefs.h"
+#include "packet-tcp.h"
+
+#define TALI_SYNC_LENGTH    4
+#define TALI_OPCODE_LENGTH  4
+#define TALI_MSU_LENGTH     2
+#define TALI_HEADER_LENGTH  TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH + TALI_MSU_LENGTH
+
+#define TALI_SYNC "TALI"
+#define TALI_TEST "test"
+#define TALI_ALLO "allo"
+#define TALI_PROH "proh"
+#define TALI_PROA "proa"
+#define TALI_MONI "moni"
+#define TALI_MONA "mona"
+#define TALI_SCCP "sccp"
+#define TALI_ISOT "isot"
+#define TALI_MTP3 "mtp3"
+#define TALI_SAAL "saal"
+
+/* Initialize the subtree pointers */
+static gint ett_tali = -1;
+static gint ett_tali_sync = -1;
+static gint ett_tali_opcode = -1;
+static gint ett_tali_msu_length = -1;
+
+static int proto_tali  = -1;
+static dissector_handle_t tali_handle;
+static dissector_table_t tali_dissector_table;
+
+/* Initialize the protocol and registered fields */
+static int hf_tali_sync_indicator = -1;
+static int hf_tali_opcode_indicator = -1;
+static int hf_tali_length_indicator = -1;
+
+static dissector_handle_t data_handle;
+
+/* Desegment TALI messages */
+static gboolean tali_desegment = TRUE;
+
+/* Code to actually dissect the packets */
+static guint
+get_tali_pdu_len(tvbuff_t *tvb, int offset)
+{
+  guint16 length;
+
+  length = tvb_get_ntohs(tvb, offset + TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH);
+  return length+TALI_HEADER_LENGTH;
+}
+
+static void
+dissect_tali_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  char opcode[TALI_OPCODE_LENGTH+1]; /* TALI opcode */
+  guint16 length; /* TALI length */
+  tvbuff_t *payload_tvb = NULL;
+  
+  /* Set up structures needed to add the protocol subtree and manage it */
+  proto_item *tali_item = NULL;
+  proto_tree *tali_tree = NULL;
+  
+  tvb_memcpy(tvb, opcode, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH);
+  opcode[TALI_OPCODE_LENGTH] = '\0';
+  length = tvb_get_letohs(tvb, TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH);
+
+  /* Make entries in Protocol column on summary display */
+  if (check_col(pinfo->cinfo, COL_PROTOCOL))
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "TALI");
+  
+  if (check_col(pinfo->cinfo, COL_INFO)) {
+    col_set_str(pinfo->cinfo, COL_INFO, "");
+    col_append_fstr(pinfo->cinfo, COL_INFO, "[%s] packet, [%u] bytes in payload", opcode, length);
+  }
+
+  if (tree) {
+    /* create display subtree for the protocol */
+    tali_item = proto_tree_add_item(tree, proto_tali, tvb, 0, TALI_HEADER_LENGTH, TRUE);
+    tali_tree = proto_item_add_subtree(tali_item, ett_tali);
+    proto_tree_add_string(tali_tree, hf_tali_sync_indicator,   tvb, 0, TALI_SYNC_LENGTH, TALI_SYNC);
+    proto_tree_add_string(tali_tree, hf_tali_opcode_indicator, tvb, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH, opcode);
+    proto_tree_add_uint(tali_tree, hf_tali_length_indicator, tvb, TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH, TALI_MSU_LENGTH, length);
+  }
+
+  if (length > 0) {
+    payload_tvb = tvb_new_subset(tvb, TALI_HEADER_LENGTH, -1, -1);
+    if (payload_tvb != NULL && !dissector_try_string(tali_dissector_table, opcode, payload_tvb, pinfo, tree)) {
+      call_dissector(data_handle, payload_tvb, pinfo, tree);
+    }
+  }
+}
+
+static void
+dissect_tali(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  tcp_dissect_pdus(tvb, pinfo, tree, tali_desegment, TALI_HEADER_LENGTH,
+                   get_tali_pdu_len, dissect_tali_pdu);
+}
+
+/*
+ * A 'heuristic dissector' that attemtps to establish whether we have
+ * a TALI MSU here.
+ * Only works when:
+ *	the fixed header is there
+ *	it is a 'well-known' operation
+ */
+static gboolean
+dissect_tali_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  char sync[TALI_SYNC_LENGTH];     /* TALI sync */
+  char opcode[TALI_OPCODE_LENGTH]; /* TALI opcode */
+
+  if (tvb_reported_length(tvb) < TALI_HEADER_LENGTH)	/* Mandatory header	*/
+    return FALSE;
+
+  tvb_memcpy(tvb, sync, 0, TALI_SYNC_LENGTH);
+  if (strncmp(sync, TALI_SYNC, TALI_SYNC_LENGTH) != 0)
+    return FALSE;
+
+  tvb_memcpy(tvb, opcode, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH);
+  if (strncmp(opcode, TALI_TEST, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_ALLO, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_PROH, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_PROA, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_MONI, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_MONA, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_SCCP, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_ISOT, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_MTP3, TALI_OPCODE_LENGTH) != 0 &&
+      strncmp(opcode, TALI_SAAL, TALI_OPCODE_LENGTH) != 0)
+    return FALSE;
+
+  dissect_tali(tvb, pinfo, tree);
+  return TRUE;
+}
+
+void
+proto_register_tali(void)
+{
+  static hf_register_info hf[] = {
+    { &hf_tali_sync_indicator,
+      { "Sync", "tali.sync", FT_STRING, BASE_NONE, NULL, 0x00, "Tali SYNC", HFILL }},
+    { &hf_tali_opcode_indicator,
+      { "Opcode", "tali.opcode", FT_STRING, BASE_NONE, NULL, 0x00, "Tali Operation Code", HFILL }},
+    { &hf_tali_length_indicator,
+      { "Length", "tali.msu_length", FT_UINT16, BASE_DEC, NULL, 0x00, "Tali MSU Length", HFILL }}
+  };
+
+  /* Setup protocol subtree array */
+  static gint *ett[] = {
+    &ett_tali,
+    &ett_tali_sync,
+    &ett_tali_opcode,
+    &ett_tali_msu_length
+  };
+  module_t *tali_module;
+
+  /* Register the protocol name and description */
+  proto_tali = proto_register_protocol("Transport Adapter Layer Interface v1.0, RFC 3094", "TALI", "tali");
+  register_dissector("tali", dissect_tali, proto_tali);
+  tali_handle = create_dissector_handle(dissect_tali, proto_tali);
+  
+  /* Required function calls to register the header fields and subtrees used */
+  proto_register_field_array(proto_tali, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+
+  tali_dissector_table = register_dissector_table("tali.opcode", "Tali OPCODE", FT_STRING, BASE_NONE);
+
+  tali_module = prefs_register_protocol(proto_tali, NULL);
+  prefs_register_bool_preference(tali_module, "reassemble",
+	"Reassemble TALI messages spanning multiple TCP segments",
+	"Whether the TALI dissector should reassemble messages spanning multiple TCP segments."
+	" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
+    &tali_desegment);
+}
+
+void
+proto_reg_handoff_tali(void)
+{
+  heur_dissector_add("tcp", dissect_tali_heur, proto_tali);
+
+  data_handle = find_dissector("data");
+}
+