Wireshark · Ethereal-dev: [Ethereal-dev] COTP dissector updates

[matthew.bradley@xxxxxxxxxxxxx]

Hello,

This patch adds fields to the COTP dissector for:

1. DT TPDU number
2. Whether or not the DT data is the last data unit of a sequence
3. AK your TPDU number.

Many thanks,

Matthew


Index: packet-clnp.c
===================================================================
--- packet-clnp.c	(revision 11753)
+++ packet-clnp.c	(working copy)
@@ -77,6 +77,11 @@
 
 static int hf_cotp_srcref      = -1;
 static int hf_cotp_destref     = -1;
+static int hf_cotp_tpdu_number = -1;
+static int hf_cotp_next_tpdu_number = -1;
+static int hf_cotp_eot			= -1;
+static int hf_cotp_eot_extended	= -1;
+
 static int hf_cotp_type        = -1;
 static int hf_cotp_segments    = -1;
 static int hf_cotp_segment     = -1;
@@ -87,6 +92,11 @@
 static int hf_cotp_segment_error = -1;
 static int hf_cotp_reassembled_in = -1;
 
+static const true_false_string fragment_descriptions = {
+		"Yes",
+		"No"
+	};
+
 static int  proto_cltp         = -1;
 static gint ett_cltp           = -1;
 
@@ -861,6 +871,7 @@
   guint    tpdu_nr;
   guint    fragment = 0;
   guint32  fragment_length = 0;
+
   tvbuff_t *next_tvb;
   tvbuff_t *reassembled_tvb = NULL;
   fragment_data *fd_head;
@@ -879,7 +890,7 @@
       tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_234);
       if ( tpdu_nr & 0x80 )
 	tpdu_nr = tpdu_nr & 0x7F;
-      else
+      else 
 	fragment = 1;
       is_extended = FALSE;
       is_class_234 = TRUE;
@@ -893,6 +904,7 @@
 
     case LI_EXTENDED_DT_WITHOUT_CHECKSUM :
       tpdu_nr = tvb_get_ntohl(tvb, offset + P_TPDU_NR_234);
+	    
       if ( tpdu_nr & 0x80000000 )
 	tpdu_nr = tpdu_nr & 0x7FFFFFFF;
       else
@@ -904,6 +916,7 @@
 
     case LI_NORMAL_DT_CLASS_01           :
       tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_0_1);
+	  
       if ( tpdu_nr & 0x80 )
 	tpdu_nr = tpdu_nr & 0x7F;
       else
@@ -959,19 +972,17 @@
 
   if (is_extended) {
     if (tree) {
-      proto_tree_add_text(cotp_tree, tvb, offset, 4,
-			    "TPDU number: 0x%08x (%s)",
-			    tpdu_nr,
-			    (fragment)? "fragment":"complete");
+	  proto_tree_add_uint(cotp_tree, hf_cotp_tpdu_number, tvb, offset,
4, tpdu_nr);
+	  proto_tree_add_item(cotp_tree, hf_cotp_eot_extended, tvb, offset,
4, TRUE);
+      
     }
     offset += 4;
     li -= 4;
   } else {
     if (tree) {
-      proto_tree_add_text(cotp_tree, tvb, offset, 1,
-			    "TPDU number: 0x%02x (%s)",
-			    tpdu_nr,
-			    (fragment)? "fragment":"complete");
+	  proto_tree_add_uint(cotp_tree, hf_cotp_tpdu_number, tvb, offset,
1, tpdu_nr);
+	  proto_tree_add_item(cotp_tree, hf_cotp_eot, tvb, offset, 1, TRUE);
+      
     }
     offset += 1;
     li -= 1;
@@ -1143,6 +1154,8 @@
 
   if (is_extended) {
     if (tree) {
+	  proto_tree_add_uint(cotp_tree, hf_cotp_tpdu_number, tvb, offset,
4, tpdu_nr);
+	  
       proto_tree_add_text(cotp_tree, tvb, offset, 4,
 			    "TPDU number: 0x%02x", tpdu_nr);
     }
@@ -1150,6 +1163,7 @@
     li -= 4;
   } else {
     if (tree) {
+	  proto_tree_add_uint(cotp_tree, hf_cotp_tpdu_number, tvb, offset,
1, tpdu_nr);
       proto_tree_add_text(cotp_tree, tvb, offset, 1,
 			    "TPDU number: 0x%02x", tpdu_nr);
     }
@@ -1213,10 +1227,12 @@
       proto_tree_add_text(cotp_tree, tvb, offset +  1, 1,
 			  "Credit: %u", cdt);
     proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset +  2, 2,
dst_ref);
-    if (li == LI_NORMAL_RJ)
+    if (li == LI_NORMAL_RJ) {
+	  proto_tree_add_uint(cotp_tree, hf_cotp_next_tpdu_number, tvb,
offset +4 , 1, tpdu_nr);
       proto_tree_add_text(cotp_tree, tvb, offset +  4, 1,
 			  "Your TPDU number: 0x%02x", tpdu_nr);
-    else {
+    } else {
+	  proto_tree_add_item(cotp_tree, hf_cotp_next_tpdu_number, tvb,
offset +4 , 4, TRUE);
       proto_tree_add_text(cotp_tree, tvb, offset +  4, 4,
 			  "Your TPDU number: 0x%02x", tpdu_nr);
       proto_tree_add_text(cotp_tree, tvb, offset +  8, 2,
@@ -1415,6 +1431,7 @@
     li -= 2;
 
     if (tree) {
+	  proto_tree_add_uint(cotp_tree, hf_cotp_next_tpdu_number, tvb,
offset  , 1, tpdu_nr);
       proto_tree_add_text(cotp_tree, tvb, offset, 1,
 			  "Your TPDU number: 0x%02x", tpdu_nr);
     }
@@ -1456,6 +1473,7 @@
     li -= 2;
 
     if (tree) {
+	  proto_tree_add_uint(cotp_tree, hf_cotp_next_tpdu_number, tvb,
offset  , 4, tpdu_nr);
       proto_tree_add_text(cotp_tree, tvb, offset, 4,
 			  "Your TPDU number: 0x%08x", tpdu_nr);
     }
@@ -1553,6 +1571,7 @@
 
   if (is_extended) {
     if (tree) {
+	  proto_tree_add_uint(cotp_tree, hf_cotp_next_tpdu_number, tvb,
offset  , 4, tpdu_nr);
       proto_tree_add_text(cotp_tree, tvb, offset, 4,
 			    "Your TPDU number: 0x%08x", tpdu_nr);
     }
@@ -1560,6 +1579,7 @@
     li -= 4;
   } else {
     if (tree) {
+	  proto_tree_add_uint(cotp_tree, hf_cotp_next_tpdu_number, tvb,
offset  , 1, tpdu_nr);
       proto_tree_add_text(cotp_tree, tvb, offset, 1,
 			    "Your TPDU number: 0x%02x", tpdu_nr);
     }
@@ -2292,7 +2312,20 @@
     { &hf_cotp_type,
       { "COTP PDU Type", "cotp.type", FT_UINT8, BASE_HEX,
VALS(cotp_tpdu_type_abbrev_vals), 0x0,
         "COTP PDU Type", HFILL}},
-    { &hf_cotp_segment_overlap,
+	{ &hf_cotp_tpdu_number,
+		{ "TPDU Number", "cotp.tpdu-number", FT_UINT8, BASE_HEX,
NULL, 0x0,
+        "TPDU number", HFILL}},
+	{ &hf_cotp_next_tpdu_number,
+		{ "Your TPDU Number", "cotp.next-tpdu-number", FT_UINT8,
BASE_HEX, NULL, 0x0,
+        "Your TPDU number", HFILL}},
+	{ &hf_cotp_eot,
+		{ "Last data unit", "cotp.eot", FT_BOOLEAN, 8,
TFS(&fragment_descriptions),  0x80,
+        "Is current TPDU the last data unit of a complete DT TPDU
sequence?", HFILL}},
+	{ &hf_cotp_eot_extended,
+		{ "Last data unit", "cotp.eot", FT_BOOLEAN, 32,
TFS(&fragment_descriptions),  0x80000000,
+        "Is current TPDU the last data unit of a complete DT TPDU
sequence?", HFILL}},
+	
+	{ &hf_cotp_segment_overlap,
       { "Segment overlap", "cotp.segment.overlap", FT_BOOLEAN, BASE_NONE,
NULL, 0x0,
 	"Segment overlaps with other segments", HFILL }},
     { &hf_cotp_segment_overlap_conflict,


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