IEEE 802.1x, a/k/a EAPOL, and PPP/EAPOL EAP support, from Pekka

Nikander.

svn path=/trunk/; revision=4170

1 files changed, 139 insertions, 0 deletions

diff --git a/packet-eapol.c b/packet-eapol.c
new file mode 100644
index 0000000000..3e6a1b8e0c
--- /dev/null
+++ b/packet-eapol.c
@@ -0,0 +1,139 @@
+/* packet-eapol.c
+ * Routines for EAPOL 802.1X authentication header disassembly
+ *
+ * $Id: packet-eapol.c,v 1.1 2001/11/06 20:30:39 guy Exp $
+ *
+ * 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
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+
+#include <glib.h>
+#include "packet.h"
+#include "packet-ieee8023.h"
+#include "packet-ipx.h"
+#include "packet-llc.h"
+#include "etypes.h"
+
+static int proto_eapol = -1;
+static int hf_eapol_version = -1;
+static int hf_eapol_type = -1;
+static int hf_eapol_len = -1;
+
+static gint ett_eapol = -1;
+
+typedef struct _e_eapol
+{
+    guint8 eapol_ver;
+    guint8 eapol_type;
+    guint16 eapol_len;
+} e_eapol;
+
+static const char *eapol_type_name[] = { 
+    "EAP",
+    "Start",
+    "Logoff",
+    "Key",
+    "Encapsulated ASF Alert"
+};
+#define EAPOL_TYPE_COUNT (sizeof(eapol_type_name)/sizeof(eapol_type_name[0]))
+
+extern void dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
+
+static void
+dissect_eapol(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  e_eapol     eapolh;
+  guint       len;
+  proto_tree *ti;
+  proto_tree *volatile eapol_tree;
+  tvbuff_t   *next_tvb;
+
+  if (check_col(pinfo->fd, COL_PROTOCOL))
+    col_set_str(pinfo->fd, COL_PROTOCOL, "EAPOL");
+  if (check_col(pinfo->fd, COL_INFO))
+    col_clear(pinfo->fd, COL_INFO);
+
+  tvb_memcpy(tvb, (guint8 *)&eapolh, 0, sizeof(eapolh));
+  eapolh.eapol_len = ntohs(eapolh.eapol_len);
+
+  len = sizeof(eapolh) + eapolh.eapol_len;
+
+  set_actual_length(tvb, pinfo, len);
+
+  eapol_tree = NULL;
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, len, FALSE);
+    eapol_tree = proto_item_add_subtree(ti, ett_eapol);
+
+    proto_tree_add_uint(eapol_tree, hf_eapol_version, tvb, 0, 1, eapolh.eapol_ver);
+    proto_tree_add_text(eapol_tree, tvb, 1, 1, "Type: %s (%u)", 
+			eapolh.eapol_type > EAPOL_TYPE_COUNT?
+			"Unknown" : eapol_type_name[eapolh.eapol_type],
+			eapolh.eapol_type);
+    proto_tree_add_uint(eapol_tree, hf_eapol_len,    tvb, 2, 2, eapolh.eapol_len);
+  }
+
+  next_tvb = tvb_new_subset(tvb, 4, -1, -1);
+
+  if (eapolh.eapol_type == 0 && next_tvb != NULL) 
+      dissect_eap(next_tvb, pinfo, eapol_tree);
+  else
+      dissect_data(tvb, 4, pinfo, tree);
+}
+
+void
+proto_register_eapol(void)
+{
+  static hf_register_info hf[] = {
+	{ &hf_eapol_version, { 
+		"Version", "eapol.version", FT_UINT8, BASE_DEC, 
+		NULL, 0x0, "", HFILL }},
+	{ &hf_eapol_type, { 
+		"Type", "eapol.type", FT_UINT8, BASE_DEC, 
+		0, 0x0, "", HFILL }},
+	{ &hf_eapol_len, {
+		"Length", "eapol.len", FT_UINT16, BASE_DEC,
+		NULL, 0x0, "Length", HFILL }},
+  };
+  static gint *ett[] = {
+	&ett_eapol,
+  };
+
+  proto_eapol = proto_register_protocol("802.1x Authentication", "EAPOL", "eapol");
+  proto_register_field_array(proto_eapol, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_eapol(void)
+{
+  dissector_add("ethertype", ETHERTYPE_EAPOL, dissect_eapol, proto_eapol);
+}