Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 426 insertions, 0 deletions

diff --git a/epan/dissectors/packet-ax25.c b/epan/dissectors/packet-ax25.c
new file mode 100644
index 00000000..d700ade6
--- /dev/null
+++ b/epan/dissectors/packet-ax25.c
@@ -0,0 +1,426 @@
+/* packet-ax25.c
+ *
+ * Routines for Amateur Packet Radio protocol dissection
+ * AX.25 frames
+ * Copyright 2005,2006,2007,2008,2009,2010,2012 R.W. Stearn <richard@rns-stearn.demon.co.uk>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * This dissector is for:
+ * AX.25 Amateur Packet-Radio Link-Layer Protocol, Version 2.0, October 1984
+ *
+ * At the time of writing the specification could be found here:
+ *   http://www.tapr.org/pub_ax25.html
+ *
+ * A newer version, Version 2.2, July 1998, can be found at
+ *   http://www.ax25.net/AX25.2.2-Jul%2098-2.pdf
+ *
+ * Inspiration on how to build the dissector drawn from
+ *   packet-sdlc.c
+ *   packet-x25.c
+ *   packet-lapb.c
+ *   paket-gprs-llc.c
+ *   xdlc.c
+ * with the base file built from README.developers.
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/capture_dissectors.h>
+#include <epan/to_str.h>
+#include <epan/xdlc.h>
+#include <epan/ax25_pids.h>
+#include <epan/ipproto.h>
+
+#define STRLEN	80
+
+#define AX25_HEADER_SIZE	15 /* length of src_addr + dst_addr + cntl */
+#define AX25_MAX_DIGIS		 8
+
+void proto_register_ax25(void);
+void proto_reg_handoff_ax25(void);
+
+/* Dissector table */
+static dissector_table_t ax25_dissector_table;
+
+static capture_dissector_handle_t ax25_cap_handle;
+
+/* Initialize the protocol and registered fields */
+static int proto_ax25		= -1;
+static int hf_ax25_dst		= -1;
+static int hf_ax25_src		= -1;
+static int hf_ax25_via[ AX25_MAX_DIGIS ]	= { -1,-1,-1,-1,-1,-1,-1,-1 };
+
+static int hf_ax25_ctl		= -1;
+
+static int hf_ax25_n_r		= -1;
+static int hf_ax25_n_s		= -1;
+
+static int hf_ax25_p		= -1;
+static int hf_ax25_f		= -1;
+
+static int hf_ax25_ftype_s	= -1;
+static int hf_ax25_ftype_i	= -1;
+static int hf_ax25_ftype_su	= -1;
+
+static int hf_ax25_u_cmd	= -1;
+static int hf_ax25_u_resp	= -1;
+
+static int hf_ax25_pid		= -1;
+
+static const xdlc_cf_items ax25_cf_items = {
+	&hf_ax25_n_r,
+	&hf_ax25_n_s,
+	&hf_ax25_p,
+	&hf_ax25_f,
+	&hf_ax25_ftype_s,
+	&hf_ax25_u_cmd,
+	&hf_ax25_u_resp,
+	&hf_ax25_ftype_i,
+	&hf_ax25_ftype_su
+};
+
+static const value_string pid_vals[] = {
+	{ AX25_P_ROSE,	   "Rose" },
+	{ AX25_P_RFC1144C, "RFC1144 (compressed)" },
+	{ AX25_P_RFC1144,  "RFC1144 (uncompressed)" },
+	{ AX25_P_SEGMENT,  "Segment" },
+	{ AX25_P_TEXNET,   "Texnet" },
+	{ AX25_P_LCP,	   "Link Quality protocol" },
+	{ AX25_P_ATALK,	   "AppleTalk" },
+	{ AX25_P_ATALKARP, "AppleTalk ARP" },
+	{ AX25_P_IP,	   "IP" },
+	{ AX25_P_ARP,	   "ARP" },
+	{ AX25_P_FLEXNET,  "FlexNet" },
+	{ AX25_P_NETROM,   "NetRom" },
+	{ AX25_P_NO_L3,	   "No L3" },
+	{ AX25_P_L3_ESC,   "L3 esc" },
+	{ 0, NULL }
+};
+
+static gint ett_ax25 = -1;
+static gint ett_ax25_ctl = -1;
+
+static dissector_handle_t ax25_handle;
+
+static int
+dissect_ax25( tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_ )
+{
+	proto_item *ti;
+	proto_tree *ax25_tree;
+	int offset;
+	int via_index;
+	char *info_buffer;
+	/* char v2cmdresp; */
+	const char *ax25_version;
+	int is_response;
+	guint8 control;
+	guint8 pid = AX25_P_NO_L3;
+	guint8 src_ssid;
+	guint8 dst_ssid;
+	tvbuff_t *next_tvb = NULL;
+
+
+	info_buffer = (char *)wmem_alloc( pinfo->pool, STRLEN );
+	info_buffer[0] = '\0';
+
+	col_set_str( pinfo->cinfo, COL_PROTOCOL, "AX.25" );
+	col_clear( pinfo->cinfo, COL_INFO );
+
+	/* start at the dst addr */
+	offset = 0;
+	/* create display subtree for the protocol */
+	ti = proto_tree_add_protocol_format( parent_tree, proto_ax25, tvb, offset, -1, "AX.25");
+	ax25_tree = proto_item_add_subtree( ti, ett_ax25 );
+
+	proto_tree_add_item( ax25_tree, hf_ax25_dst, tvb, offset, AX25_ADDR_LEN, ENC_NA);
+	set_address_tvb(&pinfo->dl_dst, AT_AX25, AX25_ADDR_LEN, tvb, offset);
+	copy_address_shallow(&pinfo->dst, &pinfo->dl_dst);
+	dst_ssid = tvb_get_guint8(tvb, offset+6);
+
+	/* step over dst addr point at src addr */
+	offset += AX25_ADDR_LEN;
+
+	proto_tree_add_item( ax25_tree, hf_ax25_src, tvb, offset, AX25_ADDR_LEN, ENC_NA);
+	set_address_tvb(&pinfo->dl_src, AT_AX25, AX25_ADDR_LEN, tvb, offset);
+	copy_address_shallow(&pinfo->src, &pinfo->dl_src);
+	src_ssid = tvb_get_guint8(tvb, offset+6);
+
+	/* step over src addr point at either 1st via addr or control byte */
+	offset += AX25_ADDR_LEN;
+
+	proto_item_append_text( ti, ", Src: %s, Dst: %s",
+		address_to_str(pinfo->pool, &pinfo->src),
+		address_to_str(pinfo->pool, &pinfo->dst));
+
+	/* decode the cmd/resp field */
+	/* v2cmdresp = '.'; */
+	switch ( ( (dst_ssid >> 6) & 0x02) | ( (src_ssid >> 7) & 0x01 ) )
+		{
+		case 1 : /* V2.0 Response */
+			ax25_version = "V2.0+";
+			/* v2cmdresp = 'R'; */
+			is_response = TRUE;
+			break;
+		case 2 : /* V2.0 Command */
+			ax25_version = "V2.0+";
+			/* v2cmdresp = 'C'; */
+			is_response = FALSE;
+			break;
+		default :
+			ax25_version = "V?.?";
+			/* v2cmdresp = '?'; */
+			is_response = FALSE;
+			break;
+		}
+	proto_item_append_text( ti, ", Ver: %s", ax25_version );
+
+	/* handle the vias, if any */
+	via_index = 0;
+	while ( ( tvb_get_guint8( tvb, offset - 1 ) & 0x01 ) == 0 )
+		{
+		if ( via_index < AX25_MAX_DIGIS )
+			{
+			proto_tree_add_item( ax25_tree, hf_ax25_via[ via_index ], tvb, offset, AX25_ADDR_LEN, ENC_NA);
+			via_index++;
+			}
+		/* step over a via addr */
+		offset += AX25_ADDR_LEN;
+		}
+
+	/* XXX - next-to-last argument should be TRUE if modulo 128 operation */
+	control = dissect_xdlc_control(	tvb,
+					offset,
+					pinfo,
+					ax25_tree,
+					hf_ax25_ctl,
+					ett_ax25_ctl,
+					&ax25_cf_items,
+					NULL,
+					NULL,
+					NULL,
+					is_response,
+					FALSE,
+					FALSE );
+	/* XXX - second argument should be TRUE if modulo 128 operation */
+	offset += XDLC_CONTROL_LEN(control, FALSE); /* step over control field */
+
+	if ( XDLC_IS_INFORMATION( control ) )
+		{
+
+		pid      = tvb_get_guint8( tvb, offset );
+		col_append_fstr( pinfo->cinfo, COL_INFO, ", %s", val_to_str(pid, pid_vals, "Unknown (0x%02x)") );
+		proto_tree_add_uint( ax25_tree, hf_ax25_pid, tvb, offset, 1, pid );
+
+		/* Call sub-dissectors here */
+
+		offset += 1; /* step over pid to the 1st byte of the payload */
+
+		proto_item_set_end(ti, tvb, offset);
+
+		next_tvb = tvb_new_subset_remaining(tvb, offset);
+
+		if (!dissector_try_uint(ax25_dissector_table, pid, next_tvb, pinfo, parent_tree))
+			{
+			call_data_dissector(next_tvb, pinfo, parent_tree);
+			}
+		}
+	else
+		proto_item_set_end(ti, tvb, offset);
+
+	return tvb_captured_length(tvb);
+}
+
+static gboolean
+capture_ax25( const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header)
+{
+	guint8 control;
+	guint8 pid;
+	int l_offset;
+
+	if ( ! BYTES_ARE_IN_FRAME( offset, len, AX25_HEADER_SIZE ) )
+		return FALSE;
+
+	l_offset = offset;
+	l_offset += AX25_ADDR_LEN; /* step over dst addr point at src addr */
+	l_offset += AX25_ADDR_LEN; /* step over src addr point at either 1st via addr or control byte */
+	while ( ( pd[ l_offset - 1 ] & 0x01 ) == 0 )
+		l_offset += AX25_ADDR_LEN; /* step over a via addr */
+
+	control = pd[ l_offset ];
+
+	/* decode the pid field (if appropriate) */
+	if ( XDLC_IS_INFORMATION( control ) )
+	{
+		l_offset += 1; /* step over control byte point at pid */
+		pid = pd[ l_offset ];
+
+		l_offset += 1; /* step over the pid and point to the first byte of the payload */
+		return try_capture_dissector("ax25.pid", pid & 0x0ff, pd, l_offset, len, cpinfo, pseudo_header);
+	}
+	return FALSE;
+}
+
+void
+proto_register_ax25(void)
+{
+	/* Setup list of header fields */
+	static hf_register_info hf[] = {
+		{ &hf_ax25_dst,
+			{ "Destination",		"ax25.dst",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Destination callsign", HFILL }
+		},
+		{ &hf_ax25_src,
+			{ "Source",			"ax25.src",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Source callsign", HFILL }
+		},
+		{ &hf_ax25_via[ 0 ],
+			{ "Via 1",			"ax25.via1",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 1", HFILL }
+		},
+		{ &hf_ax25_via[ 1 ],
+			{ "Via 2",			"ax25.via2",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 2", HFILL }
+		},
+		{ &hf_ax25_via[ 2 ],
+			{ "Via 3",			"ax25.via3",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 3", HFILL }
+		},
+		{ &hf_ax25_via[ 3 ],
+			{ "Via 4",			"ax25.via4",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 4", HFILL }
+		},
+		{ &hf_ax25_via[ 4 ],
+			{ "Via 5",			"ax25.via5",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 5", HFILL }
+		},
+		{ &hf_ax25_via[ 5 ],
+			{ "Via 6",			"ax25.via6",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 6", HFILL }
+		},
+		{ &hf_ax25_via[ 6 ],
+			{ "Via 7",			"ax25.via7",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 7", HFILL }
+		},
+		{ &hf_ax25_via[ 7 ],
+			{ "Via 8",			"ax25.via8",
+			FT_AX25, BASE_NONE, NULL, 0x0,
+			"Via callsign 8", HFILL }
+		},
+		{ &hf_ax25_ctl,
+			{ "Control",			"ax25.ctl",
+			FT_UINT8, BASE_HEX, NULL, 0x0,
+			"Control field", HFILL }
+		},
+		{ &hf_ax25_n_r,
+			{ "n(r)",			"ax25.ctl.n_r",
+			FT_UINT8, BASE_DEC, NULL, XDLC_N_R_MASK,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_n_s,
+			{ "n(s)",			"ax25.ctl.n_s",
+			FT_UINT8, BASE_DEC, NULL, XDLC_N_S_MASK,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_p,
+			{ "Poll",			"ax25.ctl.p",
+			FT_BOOLEAN, 8, TFS(&tfs_set_notset), XDLC_P_F,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_f,
+			{ "Final",			"ax25.ctl.f",
+			FT_BOOLEAN, 8, TFS(&tfs_set_notset), XDLC_P_F,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_ftype_s,
+			{ "Frame type",			"ax25.ctl.ftype_s",
+			FT_UINT8, BASE_HEX, VALS(stype_vals), XDLC_S_FTYPE_MASK,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_ftype_i,
+			{ "Frame type",			"ax25.ctl.ftype_i",
+			FT_UINT8, BASE_HEX, VALS(ftype_vals), XDLC_I_MASK,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_ftype_su,
+			{ "Frame type",			"ax25.ctl.ftype_su",
+			FT_UINT8, BASE_HEX, VALS(ftype_vals), XDLC_S_U_MASK,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_u_cmd,
+			{ "Frame type",			"ax25.ctl.u_cmd",
+			FT_UINT8, BASE_HEX, VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_u_resp,
+			{ "Frame type",			"ax25.ctl.u_resp",
+			FT_UINT8, BASE_HEX, VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK,
+			NULL, HFILL }
+		},
+		{ &hf_ax25_pid,
+			{ "Protocol ID",		"ax25.pid",
+			FT_UINT8, BASE_HEX, VALS(pid_vals), 0x0,
+			"Protocol identifier", HFILL }
+		},
+	};
+
+	/* Setup protocol subtree array */
+	static gint *ett[] = {
+		&ett_ax25,
+		&ett_ax25_ctl,
+	};
+
+	/* Register the protocol name and description */
+	proto_ax25 = proto_register_protocol("Amateur Radio AX.25", "AX.25", "ax25");
+
+	/* Register the dissector */
+	ax25_handle = register_dissector( "ax25", dissect_ax25, proto_ax25 );
+
+	/* Required function calls to register the header fields and subtrees used */
+	proto_register_field_array( proto_ax25, hf, array_length(hf ) );
+	proto_register_subtree_array(ett, array_length(ett ) );
+
+	/* Register dissector table for protocol IDs */
+	ax25_dissector_table = register_dissector_table("ax25.pid", "AX.25 protocol ID", proto_ax25, FT_UINT8, BASE_HEX);
+	register_capture_dissector_table("ax25.pid", "AX.25");
+
+	ax25_cap_handle = register_capture_dissector("ax25", capture_ax25, proto_ax25);
+}
+
+void
+proto_reg_handoff_ax25(void)
+{
+	dissector_add_uint("wtap_encap", WTAP_ENCAP_AX25, ax25_handle);
+	dissector_add_uint("ip.proto", IP_PROTO_AX25, ax25_handle);
+
+	capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_AX25, ax25_cap_handle);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */