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wireshark/packet-pppoe.c

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/* packet-arp.c
* Routines for ARP packet disassembly
*
* $Id: packet-pppoe.c,v 1.4 1999/11/16 11:42:48 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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
#include <glib.h>
#include "packet.h"
static gint ett_pppoed = -1;
static gint ett_pppoed_tags = -1;
/* 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
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);
}
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);
}
void
dissect_pppoe_tags(const u_char *pd, int offset, frame_data *fd, 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,offset,payload_length,"PPPoE Tags");
pppoe_tree = proto_item_add_subtree(ti, ett_pppoed_tags);
tagstart = offset;
while(tagstart <= payload_length-2 ) {
poe_tag = pntohs(&pd[tagstart]);
poe_tag_length = pntohs(&pd[tagstart + 2]);
proto_tree_add_text(pppoe_tree,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,tagstart+4,poe_tag_length,
" String Data: %s", format_text(&pd[tagstart+4],poe_tag_length ));
}
break;
default:
if(poe_tag_length > 0 ) {
proto_tree_add_text(pppoe_tree,tagstart+4,poe_tag_length,
" Binary Data: (%d bytes)", poe_tag_length );
}
}
if (poe_tag == PPPOE_TAG_EOL) break;
tagstart += 4 + poe_tag_length;
}
}
}
void
dissect_pppoed(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
guint8 pppoe_ver;
guint8 pppoe_type;
guint8 pppoe_code;
guint16 pppoe_session_id;
guint16 pppoe_length;
proto_tree *pppoe_tree;
proto_item *ti;
/* Start Decoding Here. */
pppoe_ver = (guint8) ((pd[offset] >> 4) & 0x0f);
pppoe_type = (guint8) (pd[offset] & 0x0f);
pppoe_code = (guint8) pd[offset + 1];
pppoe_session_id = pntohs(&pd[offset + 2]);
pppoe_length = pntohs(&pd[offset + 4]);
if (check_col(fd, COL_PROTOCOL)) {
col_add_str(fd,COL_PROTOCOL, "PPPoED");
}
if (check_col(fd,COL_INFO)) {
col_add_fstr(fd,COL_INFO,pppoecode_to_str(pppoe_code,"Unknown code (0x%02x)"));
}
if (tree) {
ti = proto_tree_add_text(tree,offset,pppoe_length+6,"PPPoE Discovery");
pppoe_tree = proto_item_add_subtree(ti, ett_pppoed);
proto_tree_add_text(pppoe_tree,offset,1,
"Version: %d", pppoe_ver);
proto_tree_add_text(pppoe_tree,offset,1,
"Type: %d", pppoe_type);
proto_tree_add_text(pppoe_tree,offset+1,1,
"Code: %s", pppoecode_to_str(pppoe_code,"Unknown (0x%02x)"));
proto_tree_add_text(pppoe_tree,offset+2,2,
"Session ID: %04x", pppoe_session_id);
proto_tree_add_text(pppoe_tree,offset+4,2,
"Payload Length: %d", pppoe_length);
}
dissect_pppoe_tags(pd,offset+6,fd,tree,offset+6+pppoe_length);
}
void
dissect_pppoes(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
guint8 pppoe_ver;
guint8 pppoe_type;
guint8 pppoe_code;
guint16 pppoe_session_id;
guint16 pppoe_length;
proto_tree *pppoe_tree;
proto_item *ti;
/* Start Decoding Here. */
pppoe_ver = (guint8) ((pd[offset] >> 4) & 0x0f);
pppoe_type = (guint8) (pd[offset] & 0x0f);
pppoe_code = (guint8) pd[offset + 1];
pppoe_session_id = pntohs(&pd[offset + 2]);
pppoe_length = pntohs(&pd[offset + 4]);
if (check_col(fd, COL_PROTOCOL)) {
col_add_str(fd,COL_PROTOCOL, "PPPoES");
}
if (check_col(fd,COL_INFO)) {
col_add_fstr(fd,COL_INFO,pppoecode_to_str(pppoe_code,"Unknown code (0x%02x)"));
}
if (tree) {
ti = proto_tree_add_text(tree,offset,pppoe_length+6,"PPPoE Session");
pppoe_tree = proto_item_add_subtree(ti, ett_pppoed);
proto_tree_add_text(pppoe_tree,offset,1,
"Version: %d", pppoe_ver);
proto_tree_add_text(pppoe_tree,offset,1,
"Type: %d", pppoe_type);
proto_tree_add_text(pppoe_tree,offset+1,1,
"Code: %s", pppoecode_to_str(pppoe_code,"Unknown (0x%02x)"));
proto_tree_add_text(pppoe_tree,offset+2,2,
"Session ID: %04x", pppoe_session_id);
proto_tree_add_text(pppoe_tree,offset+4,2,
"Payload Length: %d", pppoe_length);
}
/* dissect_ppp is apparently done as a 'top level' dissector,
* so this doesn't work:
* dissect_ppp(pd,offset+6,fd,tree);
* Im gonna try fudging it.
*/
dissect_payload_ppp(pd,offset+6,fd,tree);
}
void
proto_register_pppoed(void)
{
static gint *ett[] = {
&ett_pppoed,
&ett_pppoed_tags,
};
proto_register_subtree_array(ett, array_length(ett));
}
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