From Adam Sulmicki <adam[AT]cfar.umd.edu>:

	Add more type values for EAP.
	Fix off-by-one bug when displaying Code of EAP message.

Get rid of an unnecessary "volatile".

Give the code and type fields value_string arrays, and use them when
putting the code and type into the protocol tree.

Base the decision of whether to put the type field into the tree on the
request code, not on the length of the packet.

Display the Type-Data field, under that name, under the EAP tree, as
it's part of the EAP PDU.

svn path=/trunk/; revision=4779

1 files changed, 30 insertions, 24 deletions

diff --git a/packet-eap.c b/packet-eap.c
index fa81cbfce6..6796e49a1e 100644
--- a/packet-eap.c
+++ b/packet-eap.c
@@ -1,7 +1,8 @@
 /* packet-eap.c
- * Routines for EAP Extensible Authentication Protocol header disassembly
+ * Routines for EAP Extensible Authentication Protocol header disassembly,
+ * RFC 2284
  *
- * $Id: packet-eap.c,v 1.7 2002/02/17 00:51:19 guy Exp $
+ * $Id: packet-eap.c,v 1.8 2002/02/22 09:52:00 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@ethereal.com>
@@ -50,20 +51,23 @@ static int hf_eap_type = -1;
 
 static gint ett_eap = -1;
 
-static dissector_handle_t data_handle;
-
 typedef struct _e_eap {
     guint8 eap_code;
     guint8 eap_id;
     guint16 eap_len;
 } e_eap;
 
+#define EAP_REQUEST	1
+#define EAP_RESPONSE	2
+#define EAP_SUCCESS	3
+#define EAP_FAILURE	4
+
 static const value_string eap_code_vals[] = { 
-    { 1, "Request" },
-    { 2, "Response" },
-    { 3, "Success" },
-    { 4, "Failure" },
-    { 0, NULL }
+    { EAP_REQUEST,  "Request" },
+    { EAP_RESPONSE, "Response" },
+    { EAP_SUCCESS,  "Success" },
+    { EAP_FAILURE,  "Failure" },
+    { 0,            NULL }
 };
 
 static const value_string eap_type_vals[] = { 
@@ -71,8 +75,9 @@ static const value_string eap_type_vals[] = {
     { 2, "Notification" },
     { 3, "Nak (Response only)" },
     { 4, "MD5-Challenge" },
-    { 5, "One-Time Password" },
+    { 5, "One-Time Password (OTP) (RFC 1938)" },
     { 6, "Generic Token Card" },
+    { 13, "EAP/TLS (RFC2716)" },
     { 0, NULL }
 };
 
@@ -82,7 +87,7 @@ dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
   e_eap       eaph;
   guint       len;
   proto_tree *ti;
-  proto_tree *volatile eap_tree;
+  proto_tree *eap_tree;
 
   if (check_col(pinfo->cinfo, COL_PROTOCOL))
     col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAP");
@@ -102,21 +107,23 @@ dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
     ti = proto_tree_add_item(tree, proto_eap, tvb, 0, len, FALSE);
     eap_tree = proto_item_add_subtree(ti, ett_eap);
 
-    proto_tree_add_text(eap_tree, tvb, 0, 0, "Code: %s (%u) ",
-			val_to_str(eaph.eap_code, eap_code_vals, "Unknown"),
-			eaph.eap_code);
+    proto_tree_add_uint(eap_tree, hf_eap_code,   tvb, 0, 1, eaph.eap_code);
 
     proto_tree_add_uint(eap_tree, hf_eap_identifier, tvb, 1, 1, eaph.eap_id);
     proto_tree_add_uint(eap_tree, hf_eap_len,    tvb, 2, 2, eaph.eap_len);
+  }
 
-    if (len > 4) {
-	guint8 eap_type = tvb_get_guint8(tvb, 4);
-	proto_tree_add_text(eap_tree, tvb, 4, 1, "Type: %s (%u)", 
-			    val_to_str(eap_type, eap_type_vals, "Unknown"),
-			    eap_type);
+  switch (eaph.eap_code) {
+
+  case EAP_REQUEST:
+  case EAP_RESPONSE:
+    if (tree) {
+      proto_tree_add_item(eap_tree, hf_eap_type, tvb, 4, 1, FALSE);
+      if (len > 5) {
+        proto_tree_add_text(eap_tree, tvb, 5, len - 5, "Type-Data (%d byte%s)",
+          len - 5, plurality(len - 5, "", "s"));
+      }
     }
-    if (len > 5)
-      call_dissector(data_handle,tvb_new_subset(tvb, 5,-1,tvb_reported_length_remaining(tvb,5)), pinfo, tree);
   }
 }
 
@@ -126,7 +133,7 @@ proto_register_eap(void)
   static hf_register_info hf[] = {
 	{ &hf_eap_code, { 
 		"Code", "eap.code", FT_UINT8, BASE_DEC, 
-		NULL, 0x0, "", HFILL }},
+		VALS(eap_code_vals), 0x0, "", HFILL }},
 	{ &hf_eap_identifier, {
 		"Id", "eap.id", FT_UINT8, BASE_DEC,
 		NULL, 0x0, "", HFILL }},
@@ -135,7 +142,7 @@ proto_register_eap(void)
 		NULL, 0x0, "", HFILL }},
 	{ &hf_eap_type, { 
 		"Type", "eap.type", FT_UINT8, BASE_DEC, 
-		NULL, 0x0, "", HFILL }},
+		VALS(eap_type_vals), 0x0, "", HFILL }},
   };
   static gint *ett[] = {
 	&ett_eap,
@@ -152,7 +159,6 @@ proto_reg_handoff_eap(void)
 {
   dissector_handle_t eap_handle;
 
-  data_handle = find_dissector("data");
   eap_handle = create_dissector_handle(dissect_eap, proto_eap);
   dissector_add("ppp.protocol", PPP_EAP, eap_handle);
 }