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/* packet-raw.c
* Routines for raw packet disassembly
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
*
* This file created and by Mike Hall <mlh@io.com>
* Copyright 1998
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/capture_dissectors.h>
#include "packet-ip.h"
#include "packet-ppp.h"
void proto_register_raw(void);
void proto_reg_handoff_raw(void);
static int proto_raw = -1;
static gint ett_raw = -1;
static const unsigned char zeroes[10] = {0,0,0,0,0,0,0,0,0,0};
static dissector_handle_t raw_handle;
static dissector_handle_t ip_handle;
static dissector_handle_t ipv6_handle;
static dissector_handle_t ppp_hdlc_handle;
static capture_dissector_handle_t ip_cap_handle;
static capture_dissector_handle_t ipv6_cap_handle;
static capture_dissector_handle_t ppp_hdlc_cap_handle;
static gboolean
capture_raw(const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
{
/* So far, the only time we get raw connection types are with Linux and
* Irix PPP connections. We can't tell what type of data is coming down
* the line, so our safest bet is IP. - GCC
*/
/* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
* sometimes. This check should be removed when 2.2 is out.
*/
if (BYTES_ARE_IN_FRAME(0,len,2) && pd[0] == 0xff && pd[1] == 0x03) {
return call_capture_dissector(ppp_hdlc_cap_handle, pd, 0, len, cpinfo, pseudo_header);
}
/* The Linux ISDN driver sends a fake MAC address before the PPP header
* on its ippp interfaces... */
else if (BYTES_ARE_IN_FRAME(0,len,8) && pd[6] == 0xff && pd[7] == 0x03) {
return call_capture_dissector(ppp_hdlc_cap_handle, pd, 6, len, cpinfo, pseudo_header);
}
/* ...except when it just puts out one byte before the PPP header... */
else if (BYTES_ARE_IN_FRAME(0,len,3) && pd[1] == 0xff && pd[2] == 0x03) {
return call_capture_dissector(ppp_hdlc_cap_handle, pd, 1, len, cpinfo, pseudo_header);
}
/* ...and if the connection is currently down, it sends 10 bytes of zeroes
* instead of a fake MAC address and PPP header. */
else if (BYTES_ARE_IN_FRAME(0,len,10) && memcmp(pd, zeroes, 10) == 0) {
return call_capture_dissector(ip_cap_handle, pd, 10, len, cpinfo, pseudo_header);
}
else {
/*
* OK, is this IPv4 or IPv6?
*/
if (BYTES_ARE_IN_FRAME(0,len,1)) {
switch (pd[0] & 0xF0) {
case 0x40:
/* IPv4 */
return call_capture_dissector(ip_cap_handle, pd, 0, len, cpinfo, pseudo_header);
#if 0
case 0x60:
/* IPv6 */
return call_capture_dissector(ipv6_cap_handle, pd, 0, len, cpinfo, pseudo_header);
#endif
}
}
}
return FALSE;
}
static int
dissect_raw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
tvbuff_t *next_tvb;
/* load the top pane info. This should be overwritten by
the next protocol in the stack */
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");
col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");
col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A");
col_set_str(pinfo->cinfo, COL_INFO, "Raw packet data");
/* populate a tree in the second pane with the status of the link
layer (ie none) */
proto_tree_add_item(tree, proto_raw, tvb, 0, tvb_captured_length(tvb), ENC_NA);
/* So far, the only time we get raw connection types are with Linux and
* Irix PPP connections. We can't tell what type of data is coming down
* the line, so our safest bet is IP. - GCC
*/
/* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
* sometimes. This check should be removed when 2.2 is out.
*/
if (tvb_get_ntohs(tvb, 0) == 0xff03) {
call_dissector(ppp_hdlc_handle, tvb, pinfo, tree);
}
/* The Linux ISDN driver sends a fake MAC address before the PPP header
* on its ippp interfaces... */
else if (tvb_get_ntohs(tvb, 6) == 0xff03) {
next_tvb = tvb_new_subset_remaining(tvb, 6);
call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
}
/* ...except when it just puts out one byte before the PPP header... */
else if (tvb_get_ntohs(tvb, 1) == 0xff03) {
next_tvb = tvb_new_subset_remaining(tvb, 1);
call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
}
/* ...and if the connection is currently down, it sends 10 bytes of zeroes
* instead of a fake MAC address and PPP header. */
else if (tvb_memeql(tvb, 0, zeroes,10) == 0) {
next_tvb = tvb_new_subset_remaining(tvb, 10);
call_dissector(ip_handle, next_tvb, pinfo, tree);
}
else {
/*
* OK, is this IPv4 or IPv6?
*/
switch (tvb_get_guint8(tvb, 0) & 0xF0) {
case 0x40:
/* IPv4 */
call_dissector(ip_handle, tvb, pinfo, tree);
break;
case 0x60:
/* IPv6 */
call_dissector(ipv6_handle, tvb, pinfo, tree);
break;
default:
/* None of the above. */
call_data_dissector(tvb, pinfo, tree);
break;
}
}
return tvb_captured_length(tvb);
}
void
proto_register_raw(void)
{
static gint *ett[] = {
&ett_raw,
};
proto_raw = proto_register_protocol("Raw packet data", "Raw", "raw");
proto_register_subtree_array(ett, array_length(ett));
raw_handle = register_dissector("raw_ip", dissect_raw, proto_raw);
}
void
proto_reg_handoff_raw(void)
{
capture_dissector_handle_t raw_cap_handle;
/*
* Get handles for the IP, IPv6, undissected-data, and
* PPP-in-HDLC-like-framing dissectors.
*/
ip_handle = find_dissector_add_dependency("ip", proto_raw);
ipv6_handle = find_dissector_add_dependency("ipv6", proto_raw);
ppp_hdlc_handle = find_dissector_add_dependency("ppp_hdlc", proto_raw);
dissector_add_uint("wtap_encap", WTAP_ENCAP_RAW_IP, raw_handle);
raw_cap_handle = create_capture_dissector_handle(capture_raw, proto_raw);
capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_RAW_IP, raw_cap_handle);
ip_cap_handle = find_capture_dissector("ip");
ipv6_cap_handle = find_capture_dissector("ipv6");
ppp_hdlc_cap_handle = find_capture_dissector("ppp_hdlc");
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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