forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
204 lines
6.2 KiB
C
204 lines
6.2 KiB
C
/* packet-raw.c
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* Routines for raw packet disassembly
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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*
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* This file created and by Mike Hall <mlh@io.com>
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* Copyright 1998
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/capture_dissectors.h>
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#include <wiretap/wtap.h>
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#include "packet-ip.h"
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#include "packet-ppp.h"
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void proto_register_raw(void);
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void proto_reg_handoff_raw(void);
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static int proto_raw = -1;
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static gint ett_raw = -1;
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static const char zeroes[10] = {0,0,0,0,0,0,0,0,0,0};
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static dissector_handle_t raw_handle;
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static dissector_handle_t ip_handle;
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static dissector_handle_t ipv6_handle;
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static dissector_handle_t ppp_hdlc_handle;
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static capture_dissector_handle_t ip_cap_handle;
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static capture_dissector_handle_t ipv6_cap_handle;
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static capture_dissector_handle_t ppp_hdlc_cap_handle;
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static gboolean
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capture_raw(const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
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{
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/* So far, the only time we get raw connection types are with Linux and
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* Irix PPP connections. We can't tell what type of data is coming down
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* the line, so our safest bet is IP. - GCC
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*/
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/* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
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* sometimes. This check should be removed when 2.2 is out.
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*/
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if (BYTES_ARE_IN_FRAME(0,len,2) && pd[0] == 0xff && pd[1] == 0x03) {
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return call_capture_dissector(ppp_hdlc_cap_handle, pd, 0, len, cpinfo, pseudo_header);
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}
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/* The Linux ISDN driver sends a fake MAC address before the PPP header
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* on its ippp interfaces... */
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else if (BYTES_ARE_IN_FRAME(0,len,8) && pd[6] == 0xff && pd[7] == 0x03) {
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return call_capture_dissector(ppp_hdlc_cap_handle, pd, 6, len, cpinfo, pseudo_header);
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}
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/* ...except when it just puts out one byte before the PPP header... */
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else if (BYTES_ARE_IN_FRAME(0,len,3) && pd[1] == 0xff && pd[2] == 0x03) {
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return call_capture_dissector(ppp_hdlc_cap_handle, pd, 1, len, cpinfo, pseudo_header);
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}
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/* ...and if the connection is currently down, it sends 10 bytes of zeroes
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* instead of a fake MAC address and PPP header. */
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else if (BYTES_ARE_IN_FRAME(0,len,10) && memcmp(pd, zeroes, 10) == 0) {
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return call_capture_dissector(ip_cap_handle, pd, 10, len, cpinfo, pseudo_header);
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}
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else {
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/*
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* OK, is this IPv4 or IPv6?
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*/
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if (BYTES_ARE_IN_FRAME(0,len,1)) {
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switch (pd[0] & 0xF0) {
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case 0x40:
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/* IPv4 */
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return call_capture_dissector(ip_cap_handle, pd, 0, len, cpinfo, pseudo_header);
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#if 0
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case 0x60:
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/* IPv6 */
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return call_capture_dissector(ipv6_cap_handle, pd, 0, len, cpinfo, pseudo_header);
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#endif
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}
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}
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}
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return FALSE;
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}
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static int
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dissect_raw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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tvbuff_t *next_tvb;
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/* load the top pane info. This should be overwritten by
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the next protocol in the stack */
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col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");
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col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A");
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col_set_str(pinfo->cinfo, COL_INFO, "Raw packet data");
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/* populate a tree in the second pane with the status of the link
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layer (ie none) */
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proto_tree_add_item(tree, proto_raw, tvb, 0, tvb_captured_length(tvb), ENC_NA);
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/* So far, the only time we get raw connection types are with Linux and
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* Irix PPP connections. We can't tell what type of data is coming down
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* the line, so our safest bet is IP. - GCC
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*/
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/* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
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* sometimes. This check should be removed when 2.2 is out.
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*/
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if (tvb_get_ntohs(tvb, 0) == 0xff03) {
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call_dissector(ppp_hdlc_handle, tvb, pinfo, tree);
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}
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/* The Linux ISDN driver sends a fake MAC address before the PPP header
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* on its ippp interfaces... */
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else if (tvb_get_ntohs(tvb, 6) == 0xff03) {
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next_tvb = tvb_new_subset_remaining(tvb, 6);
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call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
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}
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/* ...except when it just puts out one byte before the PPP header... */
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else if (tvb_get_ntohs(tvb, 1) == 0xff03) {
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next_tvb = tvb_new_subset_remaining(tvb, 1);
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call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
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}
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/* ...and if the connection is currently down, it sends 10 bytes of zeroes
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* instead of a fake MAC address and PPP header. */
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else if (tvb_memeql(tvb, 0, zeroes,10) == 0) {
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next_tvb = tvb_new_subset_remaining(tvb, 10);
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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}
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else {
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/*
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* OK, is this IPv4 or IPv6?
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*/
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switch (tvb_get_guint8(tvb, 0) & 0xF0) {
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case 0x40:
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/* IPv4 */
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call_dissector(ip_handle, tvb, pinfo, tree);
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break;
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case 0x60:
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/* IPv6 */
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call_dissector(ipv6_handle, tvb, pinfo, tree);
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break;
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default:
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/* None of the above. */
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call_data_dissector(tvb, pinfo, tree);
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break;
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}
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_raw(void)
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{
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static gint *ett[] = {
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&ett_raw,
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};
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proto_raw = proto_register_protocol("Raw packet data", "Raw", "raw");
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proto_register_subtree_array(ett, array_length(ett));
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raw_handle = register_dissector("raw_ip", dissect_raw, proto_raw);
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}
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void
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proto_reg_handoff_raw(void)
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{
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capture_dissector_handle_t raw_cap_handle;
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/*
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* Get handles for the IP, IPv6, undissected-data, and
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* PPP-in-HDLC-like-framing dissectors.
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*/
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ip_handle = find_dissector_add_dependency("ip", proto_raw);
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ipv6_handle = find_dissector_add_dependency("ipv6", proto_raw);
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ppp_hdlc_handle = find_dissector_add_dependency("ppp_hdlc", proto_raw);
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dissector_add_uint("wtap_encap", WTAP_ENCAP_RAW_IP, raw_handle);
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raw_cap_handle = create_capture_dissector_handle(capture_raw, proto_raw);
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capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_RAW_IP, raw_cap_handle);
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ip_cap_handle = find_capture_dissector("ip");
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ipv6_cap_handle = find_capture_dissector("ipv6");
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ppp_hdlc_cap_handle = find_capture_dissector("ppp_hdlc");
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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