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-rw-r--r--epan/dissectors/packet-pppoe.c309
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diff --git a/epan/dissectors/packet-pppoe.c b/epan/dissectors/packet-pppoe.c
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+++ b/epan/dissectors/packet-pppoe.c
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+/* packet-pppoe.c
+ * Routines for PPP Over Ethernet (PPPoE) packet disassembly (RFC2516)
+ *
+ * $Id$
+ *
+ * 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 <glib.h>
+#include <epan/packet.h>
+#include <epan/strutil.h>
+#include "etypes.h"
+
+static int proto_pppoed = -1;
+
+static gint ett_pppoed = -1;
+static gint ett_pppoed_tags = -1;
+
+static int proto_pppoes = -1;
+
+static dissector_handle_t ppp_handle;
+
+/* For lack of a better source, I made up the following defines. -jsj */
+
+#define PPPOE_CODE_SESSION 0x00
+#define PPPOE_CODE_PADO 0x7
+#define PPPOE_CODE_PADI 0x9
+#define PPPOE_CODE_PADR 0x19
+#define PPPOE_CODE_PADS 0x65
+#define PPPOE_CODE_PADT 0xa7
+
+#define PPPOE_TAG_EOL 0x0000
+#define PPPOE_TAG_SVC_NAME 0x0101
+#define PPPOE_TAG_AC_NAME 0x0102
+#define PPPOE_TAG_HOST_UNIQ 0x0103
+#define PPPOE_TAG_AC_COOKIE 0x0104
+#define PPPOE_TAG_VENDOR 0x0105
+#define PPPOE_TAG_RELAY_ID 0x0110
+#define PPPOE_TAG_SVC_ERR 0x0201
+#define PPPOE_TAG_AC_ERR 0x0202
+#define PPPOE_TAG_GENERIC_ERR 0x0203
+
+static gchar *
+pppoecode_to_str(guint8 codetype, const char *fmt) {
+ static const value_string code_vals[] = {
+ {PPPOE_CODE_SESSION, "Session Data" },
+ {PPPOE_CODE_PADO, "Active Discovery Offer (PADO)" },
+ {PPPOE_CODE_PADI, "Active Discovery Initiation (PADI)" },
+ {PPPOE_CODE_PADR, "Active Discovery Request (PADR)" },
+ {PPPOE_CODE_PADS, "Active Discovery Session-confirmation (PADS)"},
+ {PPPOE_CODE_PADT, "Active Discovery Terminate (PADT)" },
+ {0, NULL } };
+
+ return val_to_str(codetype, code_vals, fmt);
+}
+
+static gchar *
+pppoetag_to_str(guint16 tag_type, const char *fmt) {
+ static const value_string code_vals[] = {
+ {PPPOE_TAG_EOL, "End-Of-List" },
+ {PPPOE_TAG_SVC_NAME, "Service-Name" },
+ {PPPOE_TAG_AC_NAME, "AC-Name" },
+ {PPPOE_TAG_HOST_UNIQ, "Host-Uniq" },
+ {PPPOE_TAG_AC_COOKIE, "AC-Cookie" },
+ {PPPOE_TAG_VENDOR, "Vendor-Specific" },
+ {PPPOE_TAG_RELAY_ID, "Relay-Session-Id" },
+ {PPPOE_TAG_SVC_ERR, "Service-Name-Error"},
+ {PPPOE_TAG_AC_ERR, "AC-System-Error" },
+ {PPPOE_TAG_GENERIC_ERR,"Generic-Error" },
+ {0, NULL } };
+
+ return val_to_str(tag_type, code_vals, fmt);
+}
+
+
+static void
+dissect_pppoe_tags(tvbuff_t *tvb, int offset, proto_tree *tree, int payload_length) {
+
+ guint16 poe_tag;
+ guint16 poe_tag_length;
+ int tagstart;
+
+ proto_tree *pppoe_tree;
+ proto_item *ti;
+
+ /* Start Decoding Here. */
+
+ if (tree) {
+ ti = proto_tree_add_text(tree, tvb,offset,payload_length,"PPPoE Tags");
+ pppoe_tree = proto_item_add_subtree(ti, ett_pppoed_tags);
+
+ tagstart = offset;
+ while(tagstart <= payload_length-2 ) {
+
+ poe_tag = tvb_get_ntohs(tvb, tagstart);
+ poe_tag_length = tvb_get_ntohs(tvb, tagstart + 2);
+
+ proto_tree_add_text(pppoe_tree, tvb,tagstart,4,
+ "Tag: %s", pppoetag_to_str(poe_tag,"Unknown (0x%02x)"));
+
+ switch(poe_tag) {
+ case PPPOE_TAG_SVC_NAME:
+ case PPPOE_TAG_AC_NAME:
+ case PPPOE_TAG_SVC_ERR:
+ case PPPOE_TAG_AC_ERR:
+ case PPPOE_TAG_GENERIC_ERR:
+ /* tag value should be interpreted as a utf-8 unterminated string.*/
+ if(poe_tag_length > 0 ) {
+ /* really should do some limit checking here. :( */
+ proto_tree_add_text(pppoe_tree, tvb,tagstart+4,poe_tag_length,
+ " String Data: %s",
+ tvb_format_text(tvb, tagstart+4,poe_tag_length ));
+ }
+ break;
+ default:
+ if(poe_tag_length > 0 ) {
+ proto_tree_add_text(pppoe_tree, tvb,tagstart+4,poe_tag_length,
+ " Binary Data: (%d bytes)", poe_tag_length );
+ }
+ }
+
+ if (poe_tag == PPPOE_TAG_EOL) break;
+
+ tagstart += 4 + poe_tag_length;
+ }
+ }
+}
+
+static void
+dissect_pppoed(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
+ guint8 pppoe_ver_type;
+ guint8 pppoe_ver;
+ guint8 pppoe_type;
+ guint8 pppoe_code;
+ guint16 pppoe_session_id;
+ guint16 pppoe_length;
+
+ proto_tree *pppoe_tree;
+ proto_item *ti;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
+ col_set_str(pinfo->cinfo,COL_PROTOCOL, "PPPoED");
+ }
+ if (check_col(pinfo->cinfo,COL_INFO)) {
+ col_clear(pinfo->cinfo,COL_INFO);
+ }
+
+ /* Start Decoding Here. */
+ pppoe_ver_type = tvb_get_guint8(tvb, 0);
+ pppoe_ver = (pppoe_ver_type >> 4) & 0x0f;
+ pppoe_type = pppoe_ver_type & 0x0f;
+ pppoe_code = tvb_get_guint8(tvb, 1);
+
+ if (check_col(pinfo->cinfo,COL_INFO)) {
+ col_add_fstr(pinfo->cinfo,COL_INFO,pppoecode_to_str(pppoe_code,"Unknown code (0x%02x)"));
+ }
+
+ pppoe_session_id = tvb_get_ntohs(tvb, 2);
+ pppoe_length = tvb_get_ntohs(tvb, 4);
+
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_pppoed, tvb,0,
+ pppoe_length+6, FALSE);
+ pppoe_tree = proto_item_add_subtree(ti, ett_pppoed);
+ proto_tree_add_text(pppoe_tree, tvb,0,1,
+ "Version: %u", pppoe_ver);
+ proto_tree_add_text(pppoe_tree, tvb,0,1,
+ "Type: %u", pppoe_type);
+ proto_tree_add_text(pppoe_tree, tvb,1,1,
+ "Code: %s", pppoecode_to_str(pppoe_code,"Unknown (0x%02x)"));
+ proto_tree_add_text(pppoe_tree, tvb,2,2,
+ "Session ID: %04x", pppoe_session_id);
+ proto_tree_add_text(pppoe_tree, tvb,4,2,
+ "Payload Length: %u", pppoe_length);
+ }
+ dissect_pppoe_tags(tvb,6,tree,6+pppoe_length);
+}
+
+void
+proto_register_pppoed(void)
+{
+ static gint *ett[] = {
+ &ett_pppoed,
+ &ett_pppoed_tags,
+ };
+
+ proto_pppoed = proto_register_protocol("PPP-over-Ethernet Discovery",
+ "PPPoED", "pppoed");
+
+ proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_pppoed(void)
+{
+ dissector_handle_t pppoed_handle;
+
+ pppoed_handle = create_dissector_handle(dissect_pppoed, proto_pppoed);
+ dissector_add("ethertype", ETHERTYPE_PPPOED, pppoed_handle);
+}
+
+static void
+dissect_pppoes(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
+ guint8 pppoe_ver_type;
+ guint8 pppoe_ver;
+ guint8 pppoe_type;
+ guint8 pppoe_code;
+ guint16 pppoe_session_id;
+ guint16 pppoe_length;
+ gint length, reported_length;
+
+ proto_tree *pppoe_tree;
+ proto_item *ti;
+ tvbuff_t *next_tvb;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
+ col_set_str(pinfo->cinfo,COL_PROTOCOL, "PPPoES");
+ }
+ if (check_col(pinfo->cinfo,COL_INFO)) {
+ col_clear(pinfo->cinfo,COL_INFO);
+ }
+
+ /* Start Decoding Here. */
+ pppoe_ver_type = tvb_get_guint8(tvb, 0);
+ pppoe_ver = (pppoe_ver_type >> 4) & 0x0f;
+ pppoe_type = pppoe_ver_type & 0x0f;
+ pppoe_code = tvb_get_guint8(tvb, 1);
+
+ if (check_col(pinfo->cinfo,COL_INFO)) {
+ col_add_fstr(pinfo->cinfo,COL_INFO,
+ pppoecode_to_str(pppoe_code,"Unknown code (0x%02x)"));
+ }
+
+ pppoe_session_id = tvb_get_ntohs(tvb, 2);
+ pppoe_length = tvb_get_ntohs(tvb, 4);
+
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_pppoes, tvb,0,
+ 6, FALSE);
+ pppoe_tree = proto_item_add_subtree(ti, ett_pppoed);
+ proto_tree_add_text(pppoe_tree, tvb,0,1,
+ "Version: %u", pppoe_ver);
+ proto_tree_add_text(pppoe_tree, tvb,0,1,
+ "Type: %u", pppoe_type);
+ proto_tree_add_text(pppoe_tree, tvb,1,1,
+ "Code: %s", pppoecode_to_str(pppoe_code,"Unknown (0x%02x)"));
+ proto_tree_add_text(pppoe_tree, tvb,2,2,
+ "Session ID: %04x", pppoe_session_id);
+ proto_tree_add_text(pppoe_tree, tvb,4,2,
+ "Payload Length: %u", pppoe_length);
+ }
+ /* dissect_ppp is apparently done as a 'top level' dissector,
+ * so this doesn't work:
+ * dissect_ppp(pd,offset+6,pinfo->fd,tree);
+ * Im gonna try fudging it.
+ */
+ length = tvb_length_remaining(tvb, 6);
+ reported_length = tvb_reported_length_remaining(tvb, 6);
+ g_assert(length >= 0);
+ g_assert(reported_length >= 0);
+ if (length > reported_length)
+ length = reported_length;
+ if ((guint)length > pppoe_length)
+ length = pppoe_length;
+ if ((guint)reported_length > pppoe_length)
+ reported_length = pppoe_length;
+ next_tvb = tvb_new_subset(tvb,6,length,reported_length);
+ call_dissector(ppp_handle,next_tvb,pinfo,tree);
+}
+void
+proto_register_pppoes(void)
+{
+ proto_pppoes = proto_register_protocol("PPP-over-Ethernet Session",
+ "PPPoES", "pppoes");
+}
+
+void
+proto_reg_handoff_pppoes(void)
+{
+ dissector_handle_t pppoes_handle;
+
+ pppoes_handle = create_dissector_handle(dissect_pppoes, proto_pppoes);
+ dissector_add("ethertype", ETHERTYPE_PPPOES, pppoes_handle);
+
+ /*
+ * Get a handle for the PPP dissector.
+ */
+ ppp_handle = find_dissector("ppp");
+}
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