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/* packet-ppp.c
* Routines for ppp packet disassembly
*
* $Id: packet-ppp.c,v 1.10 1999/03/23 03:14:43 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
*
* This file created and by Mike Hall <mlh@io.com>
* Copyright 1998
*
* 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"
/* PPP structs and definitions */
typedef struct _e_ppphdr {
guint8 ppp_addr;
guint8 ppp_ctl;
guint16 ppp_prot;
} e_ppphdr;
/* Protocol types, from Linux "ppp_defs.h" and
http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
*/
#define PPP_IP 0x21 /* Internet Protocol */
#define PPP_AT 0x29 /* AppleTalk Protocol */
#define PPP_IPX 0x2b /* IPX protocol */
#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
#define PPP_VINES 0x35 /* Banyan Vines */
#define PPP_IPV6 0x57 /* Internet Protocol Version 6 */
#define PPP_COMP 0xfd /* compressed packet */
#define PPP_IPCP 0x8021 /* IP Control Protocol */
#define PPP_ATCP 0x8029 /* AppleTalk Control Protocol */
#define PPP_IPXCP 0x802b /* IPX Control Protocol */
#define PPP_CCP 0x80fd /* Compression Control Protocol */
#define PPP_LCP 0xc021 /* Link Control Protocol */
#define PPP_PAP 0xc023 /* Password Authentication Protocol */
#define PPP_LQR 0xc025 /* Link Quality Report protocol */
#define PPP_CHAP 0xc223 /* Cryptographic Handshake Auth. Protocol */
#define PPP_CBCP 0xc029 /* Callback Control Protocol */
void
capture_ppp( const u_char *pd, guint32 cap_len, packet_counts *ld ) {
switch (pntohs(&pd[2])) {
case PPP_IP:
capture_ip(pd, 4, cap_len, ld);
break;
default:
ld->other++;
break;
}
}
void
dissect_ppp( const u_char *pd, frame_data *fd, proto_tree *tree ) {
e_ppphdr ph;
proto_tree *fh_tree;
proto_item *ti;
static const value_string ppp_vals[] = {
{PPP_IP, "IP" },
{PPP_AT, "Appletalk" },
{PPP_IPX, "Netware IPX/SPX"},
{PPP_VINES, "Vines" },
{PPP_IPV6, "IPv6" },
{0, NULL } };
ph.ppp_addr = pd[0];
ph.ppp_ctl = pd[1];
ph.ppp_prot = pntohs(&pd[2]);
/* load the top pane info. This should be overwritten by
the next protocol in the stack */
if(check_col(fd, COL_RES_DL_SRC))
col_add_str(fd, COL_RES_DL_SRC, "N/A" );
if(check_col(fd, COL_RES_DL_DST))
col_add_str(fd, COL_RES_DL_DST, "N/A" );
if(check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "N/A" );
if(check_col(fd, COL_INFO))
col_add_str(fd, COL_INFO, "PPP" );
/* populate a tree in the second pane with the status of the link
layer (ie none) */
if(tree) {
ti = proto_tree_add_item(tree, 0, 4, "Point-to-Point Protocol" );
fh_tree = proto_tree_new();
proto_item_add_subtree(ti, fh_tree, ETT_PPP);
proto_tree_add_item(fh_tree, 0, 1, "Address: %02x", ph.ppp_addr);
proto_tree_add_item(fh_tree, 1, 1, "Control: %02x", ph.ppp_ctl);
proto_tree_add_item(fh_tree, 2, 2, "Protocol: %s (0x%04x)",
val_to_str(ph.ppp_prot, ppp_vals, "Unknown"), ph.ppp_prot);
}
switch (ph.ppp_prot) {
case PPP_IP:
dissect_ip(pd, 4, fd, tree);
break;
case PPP_AT:
dissect_ddp(pd, 4, fd, tree);
break;
case PPP_IPX:
dissect_ipx(pd, 4, fd, tree);
break;
case PPP_VINES:
dissect_vines(pd, 4, fd, tree);
break;
case PPP_IPV6:
dissect_ipv6(pd, 4, fd, tree);
break;
default:
dissect_data(pd, 4, fd, tree);
if (check_col(fd, COL_PROTOCOL))
col_add_fstr(fd, COL_PROTOCOL, "0x%04x", ph.ppp_prot);
break;
}
}
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