Wireshark · Wireshark-dev: [Wireshark-dev] [PATCH][Update] New dissector : Roofnet

[Sebastien Tandel <sebastien@xxxxxxxxx>]

Update of the patch for the roofnet dissector. It takes into account the
comments of Jaap.


Sebastien Tandel

Index: epan/dissectors/Makefile.common
===================================================================
--- epan/dissectors/Makefile.common	(révision 20151)
+++ epan/dissectors/Makefile.common	(copie de travail)
@@ -569,6 +569,7 @@
 	packet-rmt-lct.c	\
 	packet-rmt-norm.c	\
 	packet-rnsap.c	\
+	packet-roofnet.c \
 	packet-ros.c	\
 	packet-rpc.c	\
 	packet-rpl.c	\
Index: epan/dissectors/packet-roofnet.c
===================================================================
--- epan/dissectors/packet-roofnet.c	(révision 0)
+++ epan/dissectors/packet-roofnet.c	(révision 0)
@@ -0,0 +1,377 @@
+/* ==================================================================
+* packet-roofnet.c
+* Routines for roofnet dissection
+*
+* Copyright 2006, Sebastien Tandel (sebastien@xxxxxxxxx)
+*
+* Wireshark - Network traffic analyzer
+* By Gerald Combs <gerald@xxxxxxxxxxxxx>
+* 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.
+*
+* 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 <glib.h>
+
+#include <epan/packet.h>
+#include <epan/addr_resolv.h>
+#include <epan/value_string.h>
+#include <epan/expert.h>
+#include <epan/ptvcursor.h>
+#include <epan/tvbuff.h>
+
+
+/* roofnet packet type constants */
+#define ROOFNET_PT_QUERY 0x01
+#define ROOFNET_PT_REPLY 0x02
+#define ROOFNET_PT_DATA 0x04
+#define ROOFNET_PT_GATEWAY 0x08
+static const value_string roofnet_pt_vals[] = {
+  { ROOFNET_PT_QUERY, "Query" },
+  { ROOFNET_PT_REPLY, "Reply" },
+  { ROOFNET_PT_DATA, "Data" },
+  { ROOFNET_PT_GATEWAY, "Gateway" },
+  { 0, NULL }
+};
+
+/* roofnet flag bit masks */
+#define ROOFNET_FLAG_ERROR 0x01
+#define ROOFNET_FLAG_UPDATE 0x02
+static const value_string roofnet_flags_vals[] = {
+  { ROOFNET_FLAG_ERROR, "Error" },
+  { ROOFNET_FLAG_UPDATE, "Update" },
+  { 0, NULL }
+};
+
+/* header length */
+#define ROOFNET_HEADER_LENGTH 160
+/* roofnet max length */
+/* may change with time */
+#define ROOFNET_MAX_LENGTH 400
+/* Roofnet Link Description Length 
+ * which is 6 fields of 4 bytes */
+#define ROOFNET_LINK_DESCRIPTION_LENGTH 6*4
+
+/* offset constants */
+#define ROOFNET_OFFSET_TYPE 1
+#define ROOFNET_OFFSET_NLINKS 2
+#define ROOFNET_OFFSET_DATA_LENGTH 10
+
+/* offset relative to a link section of roofnet */
+#define ROOFNET_LINK_OFFSET_SRC 0
+#define ROOFNET_LINK_OFFSET_DST 20
+/* roofnet link fields length */
+#define ROOFNET_LINK_LEN 24
+
+/* forward reference */
+void proto_reg_handoff_roofnet();
+
+static dissector_handle_t ip_handle;
+static int proto_roofnet = -1;
+
+/* hf fields for the header of roofnet */
+static int hf_roofnet_version = -1;
+static int hf_roofnet_type = -1;
+static int hf_roofnet_nlinks = -1;
+static int hf_roofnet_next = -1;
+static int hf_roofnet_ttl = -1;
+static int hf_roofnet_cksum = -1;
+static int hf_roofnet_flags = -1;
+static int hf_roofnet_data_length = -1;
+static int hf_roofnet_query_dst = -1;
+static int hf_roofnet_seq = -1;
+static int hf_roofnet_links = -1;
+static int hf_roofnet_link_src = -1;
+static int hf_roofnet_link_forward = -1;
+static int hf_roofnet_link_rev = -1;
+static int hf_roofnet_link_seq = -1;
+static int hf_roofnet_link_age = -1;
+static int hf_roofnet_link_dst = -1;
+
+
+static gint ett_roofnet = -1;
+static gint ett_roofnet_link = -1;
+
+/* 
+ * dissect the header of roofnet 
+ */
+static void dissect_roofnet_header(proto_tree *tree, tvbuff_t *tvb, 
+	guint *offset)
+{
+  ptvcursor_t *cursor = ptvcursor_new(tree, tvb, *offset);
+
+  ptvcursor_add(cursor, hf_roofnet_version, 1, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_type, 1, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_nlinks, 1, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_next, 1, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_ttl, 2, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_cksum, 2, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_flags, 2, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_data_length, 2, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_query_dst, 4, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_seq, 4, FALSE);
+
+  *offset = ptvcursor_current_offset(cursor);
+  ptvcursor_free(cursor);
+}
+
+
+/*
+ *dissect the description of link in roofnet
+ */
+static int dissect_roofnet_link(proto_tree *tree, tvbuff_t *tvb, 
+	  guint *offset, guint link)
+{
+  proto_item *it= NULL;
+  proto_tree *subtree= NULL;
+
+  ptvcursor_t *cursor= NULL;
+
+  guint32 addr_src= 0;
+  guint32 addr_dst= 0;
+
+  addr_src= tvb_get_ipv4(tvb, *offset + ROOFNET_LINK_OFFSET_SRC);
+  addr_dst= tvb_get_ipv4(tvb, *offset + ROOFNET_LINK_OFFSET_DST);
+  
+  it = proto_tree_add_text(tree, tvb, *offset, ROOFNET_LINK_LEN, 
+			    "link: %u, src: %s, dst: %s", 
+			    link, 
+			    (char*)get_hostname(addr_src), 
+			    (char*)get_hostname(addr_dst));
+  subtree= proto_item_add_subtree(it, ett_roofnet_link);
+
+  proto_tree_add_ipv4(subtree, hf_roofnet_link_src, tvb, *offset, 4, addr_src);
+  *offset += 4;
+
+  cursor = ptvcursor_new(subtree, tvb, *offset);
+
+  ptvcursor_add(cursor, hf_roofnet_link_forward, 4, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_link_rev, 4, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_link_seq, 4, FALSE);
+  ptvcursor_add(cursor, hf_roofnet_link_age, 4, FALSE);
+
+  ptvcursor_free(cursor);
+
+  *offset = ptvcursor_current_offset(cursor);
+  proto_tree_add_ipv4(subtree, hf_roofnet_link_dst, tvb, *offset, 4, addr_dst);
+  /* don't increment offset here because the dst of this link is the src of the next one */
+}
+
+static void dissect_roofnet_data(proto_tree *tree, tvbuff_t *tvb, packet_info * pinfo, gint offset)
+{
+  guint16 roofnet_datalen= 0;
+  guint16 remaining_datalen= 0;
+
+  roofnet_datalen = tvb_get_ntohs(tvb, ROOFNET_OFFSET_DATA_LENGTH);
+  remaining_datalen= tvb_reported_length_remaining(tvb, offset);
+
+
+  /* dissect on remaining_datalen */
+   if (roofnet_datalen < remaining_datalen)
+     proto_tree_add_text(tree, tvb, offset, roofnet_datalen, 
+	 "[More payload data (%u) than told by Roofnet (%u)]", 
+	 remaining_datalen, roofnet_datalen);
+
+  if (roofnet_datalen == 0)
+    return;
+
+  /* dissect ip payload */
+  call_dissector(ip_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
+
+}
+
+/* 
+ * entry point of the roofnet dissector
+ */
+static void dissect_roofnet(tvbuff_t *tvb, packet_info *pinfo, 
+				    proto_tree *tree)
+{
+  proto_item * it= NULL;
+  proto_tree * roofnet_tree= NULL;
+  proto_tree * roofnet_links_tree= NULL;
+  guint offset= 0;
+
+  guint8 roofnet_msg_type= 0;
+  guint8 roofnet_nlinks= 0;
+  guint8 nlink= 1;
+  
+  if (check_col(pinfo->cinfo, COL_PROTOCOL))
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "Roofnet");
+
+  roofnet_msg_type = tvb_get_guint8(tvb, ROOFNET_OFFSET_TYPE);
+  /* Clear out stuff in the info column */
+  if (check_col(pinfo->cinfo, COL_INFO)) {
+    col_clear(pinfo->cinfo, COL_INFO);
+    col_append_fstr(pinfo->cinfo, COL_INFO, "Message Type: %s",
+	match_strval(roofnet_msg_type, roofnet_pt_vals));
+  }
+
+  if (tree) {
+    it = proto_tree_add_item(tree, proto_roofnet, tvb, offset, -1, FALSE);
+    roofnet_tree = proto_item_add_subtree(it, ett_roofnet);
+  }
+
+  dissect_roofnet_header(roofnet_tree, tvb, &offset);
+
+  roofnet_nlinks= tvb_get_guint8(tvb, ROOFNET_OFFSET_NLINKS);
+  /* Check that we do not have a malformed roofnet packet */
+  if ((roofnet_nlinks*6*4)+ROOFNET_HEADER_LENGTH > ROOFNET_MAX_LENGTH) {
+    if (tree) {
+      expert_add_info_format(pinfo, it, PI_MALFORMED, PI_ERROR, "Too many links (%u)\n", roofnet_nlinks);
+    }
+    return;
+  }
+
+  for (; roofnet_nlinks > 0; roofnet_nlinks--) {
+    /* Do we have enough buffer to decode the next link ? */
+    if (tvb_reported_length_remaining(tvb, offset) < ROOFNET_LINK_DESCRIPTION_LENGTH)
+      return;
+    dissect_roofnet_link(roofnet_tree, tvb, &offset, nlink++);
+  }
+
+  dissect_roofnet_data(tree, tvb, pinfo, offset+4);
+}
+
+void proto_register_roofnet(void)
+{
+  static hf_register_info hf[] = {
+    /* Roofnet Header */
+    { &hf_roofnet_version,
+      { "Version", "roofnet.version",
+      FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Version", HFILL }
+    },
+
+    { &hf_roofnet_type,
+      { "Type", "roofnet.type",
+	FT_UINT8, BASE_DEC, VALS(&roofnet_pt_vals), 0x0, "Roofnet Message Type", HFILL }
+    },
+
+    { &hf_roofnet_nlinks,
+      { "Number of Links", "roofnet.nlinks",
+	FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Number of Links", HFILL }
+    },
+
+    { &hf_roofnet_next,
+      { "Next Link", "roofnet.next",
+	FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Next Link to Use", HFILL }
+    },
+
+    { &hf_roofnet_ttl,
+      { "Time To Live", "roofnet.ttl",
+	FT_UINT16, BASE_DEC, NULL, 0x0, "Roofnet Time to Live", HFILL }
+    },
+
+    { &hf_roofnet_cksum,
+      { "Checksum", "roofnet.cksum",
+	FT_UINT16, BASE_DEC, NULL, 0x0, "Roofnet Header Checksum", HFILL }
+    },
+
+    { &hf_roofnet_flags,
+      { "Flags", "roofnet.flags",
+	FT_UINT16, BASE_DEC, VALS(&roofnet_flags_vals), 0x0, "Roofnet Flags", HFILL }
+    },
+
+    { &hf_roofnet_data_length,
+      { "Data Length", "roofnet.datalength",
+	FT_UINT16, BASE_DEC, NULL, 0x0, "Data Payload Length", HFILL }
+    },
+
+    { &hf_roofnet_query_dst,
+      { "Query Dst", "roofnet.querydst",
+	FT_IPv4, BASE_HEX, NULL, 0x0, "Roofnet Query Destination", HFILL }
+    },
+
+    { &hf_roofnet_seq,
+      { "Seq", "roofnet.seq",
+	FT_UINT32, BASE_DEC, NULL, 0x0, "Roofnet Sequential Number", HFILL }
+    },
+
+    { &hf_roofnet_links,
+      { "Links", "roofnet.links",
+      FT_NONE, BASE_DEC, NULL, 0x0, "", HFILL }
+    },
+
+    { &hf_roofnet_link_src,
+      { "Source IP", "roofnet.link.src",
+      FT_IPv4, BASE_HEX, NULL, 0x0, "Roofnet Message Source", HFILL }
+    },
+
+    { &hf_roofnet_link_forward,
+      { "Forward", "roofnet.link.forward",
+	FT_UINT32, BASE_DEC, NULL, 0x0, "Forward", HFILL }
+    },
+
+    { &hf_roofnet_link_rev,
+      { "Rev", "roofnet.link.rev",
+	FT_UINT32, BASE_DEC, NULL, 0x0, "Revision Number", HFILL }
+    },
+
+    { &hf_roofnet_link_seq,
+      { "Seq", "roofnet.link.seq",
+	FT_UINT32, BASE_DEC, NULL, 0x0, "Link Sequential Number", HFILL }
+    },
+
+    { &hf_roofnet_link_age,
+      { "Age", "roofnet.link.age",
+	FT_UINT32, BASE_DEC, NULL, 0x0, "Information Age", HFILL }
+    },
+
+    { &hf_roofnet_link_dst,
+      { "Dst IP", "roofnet.link.dst",
+	FT_IPv4, BASE_HEX, NULL, 0x0, "Roofnet Message Destination", HFILL }
+    }
+  };
+
+    /* setup protocol subtree array */
+    static gint *ett[] = {
+      &ett_roofnet,
+      &ett_roofnet_link
+    };
+
+    proto_roofnet = proto_register_protocol( 
+				"Roofnet Protocol", /* Name */
+				"Roofnet",	    /* Short Name */
+				"roofnet"	    /* Abbrev */
+				);
+
+    proto_register_field_array(proto_roofnet, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+}
+
+static dissector_handle_t roofnet_handle;
+
+void 
+proto_reg_handoff_roofnet(void)
+{
+  static gboolean initalised= FALSE;
+
+  if (!initalised) {
+    /* Until now there is no other option than having an IPv4 payload (maybe
+     * extended one day to IPv6 or other? */
+    ip_handle = find_dissector("ip");
+    roofnet_handle = create_dissector_handle(dissect_roofnet, proto_roofnet);
+    /* I did not put the type numbers in the ethertypes.h as they only are
+     * experimental and not official */
+    dissector_add("ethertype", 0x0641, roofnet_handle);
+    dissector_add("ethertype", 0x0643, roofnet_handle);
+    dissector_add("ethertype", 0x0644, roofnet_handle);
+    dissector_add("ethertype", 0x0645, roofnet_handle);
+    initalised= TRUE;
+  }
+}