Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 260 insertions, 0 deletions

diff --git a/epan/dissectors/packet-isdn.c b/epan/dissectors/packet-isdn.c
new file mode 100644
index 00000000..c1344929
--- /dev/null
+++ b/epan/dissectors/packet-isdn.c
@@ -0,0 +1,260 @@
+/* packet-isdn.c
+ * Routines for ISDN packet disassembly
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/prefs.h>
+#include <wiretap/wtap.h>
+#include <epan/conversation.h>
+
+void proto_register_isdn(void);
+void proto_reg_handoff_isdn(void);
+
+static int proto_isdn = -1;
+static int hf_isdn_direction = -1;
+static int hf_isdn_channel = -1;
+
+static gint ett_isdn = -1;
+
+static dissector_handle_t isdn_handle;
+
+/*
+ * Protocol used on the D channel.
+ */
+#define DCHANNEL_LAPD	0	/* LAPD */
+#define DCHANNEL_DPNSS	1	/* DPNSS link layer */
+
+static const enum_val_t dchannel_protocol_options[] = {
+	{ "lapd",  "LAPD",  DCHANNEL_LAPD },
+	{ "DPNSS", "DPNSS", DCHANNEL_DPNSS },
+	{ NULL, NULL, 0 }
+};
+
+static int dchannel_protocol = DCHANNEL_LAPD;
+
+static dissector_handle_t lapd_phdr_handle;
+static dissector_handle_t dpnss_link_handle;
+static dissector_handle_t ppp_hdlc_handle;
+static dissector_handle_t v120_handle;
+
+static const true_false_string isdn_direction_tfs = {
+	"User->Network",
+	"Network->User"
+};
+
+static const value_string channel_vals[] = {
+	{  0,	"D" },
+	{  1,	"B1" },
+	{  2,	"B2" },
+	{  3,	"B3" },
+	{  4,	"B4" },
+	{  5,	"B5" },
+	{  6,	"B6" },
+	{  7,	"B7" },
+	{  8,	"B8" },
+	{  9,	"B9" },
+	{ 10,	"B10" },
+	{ 11,	"B11" },
+	{ 12,	"B12" },
+	{ 13,	"B13" },
+	{ 14,	"B14" },
+	{ 15,	"B15" },
+	{ 16,	"B16" },
+	{ 17,	"B17" },
+	{ 18,	"B18" },
+	{ 19,	"B19" },
+	{ 20,	"B20" },
+	{ 21,	"B21" },
+	{ 22,	"B22" },
+	{ 23,	"B23" },
+	{ 24,	"B24" },
+	{ 25,	"B25" },
+	{ 26,	"B26" },
+	{ 27,	"B27" },
+	{ 28,	"B28" },
+	{ 29,	"B29" },
+	{ 30,	"B30" },
+	{ 0,	NULL }
+};
+
+static int
+dissect_isdn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
+{
+	struct isdn_phdr *isdn = (struct isdn_phdr *)data;
+	proto_tree *isdn_tree;
+	proto_item *ti;
+	static const guint8 v120_sabme[3] = { 0x08, 0x01, 0x7F };
+	static const guint8 ppp[2] = { 0xFF, 0x03 };
+	conversation_t *conv;
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISDN");
+
+	if (isdn->uton) {
+		col_set_str(pinfo->cinfo, COL_RES_DL_DST, "Network");
+		col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "User");
+		pinfo->p2p_dir = P2P_DIR_SENT;
+	} else {
+		col_set_str(pinfo->cinfo, COL_RES_DL_DST, "User");
+		col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "Network");
+		pinfo->p2p_dir = P2P_DIR_RECV;
+	}
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_isdn, tvb, 0, 0, ENC_NA);
+		isdn_tree = proto_item_add_subtree(ti, ett_isdn);
+
+		proto_tree_add_boolean(isdn_tree, hf_isdn_direction, tvb, 0, 0,
+		     isdn->uton);
+
+		proto_tree_add_uint(isdn_tree, hf_isdn_channel, tvb, 0, 0,
+		    isdn->channel);
+	}
+
+	/*
+	 * Set up a circuit for this channel, and assign it a dissector.
+	 */
+	conv = find_or_create_conversation_by_id(pinfo, CONVERSATION_ISDN,
+	    isdn->channel);
+
+	if (conversation_get_dissector(conv, 0) == NULL) {
+		/*
+		 * We don't yet know the type of traffic on the circuit.
+		 */
+		switch (isdn->channel) {
+
+		case 0:
+			/*
+			 * D-channel.  Dissect it with whatever protocol
+			 * the user specified, or the default of LAPD if
+			 * they didn't specify one.
+			 */
+			switch (dchannel_protocol) {
+
+			case DCHANNEL_LAPD:
+				conversation_set_dissector(conv, lapd_phdr_handle);
+				break;
+
+			case DCHANNEL_DPNSS:
+				conversation_set_dissector(conv,
+				    dpnss_link_handle);
+				break;
+			}
+			break;
+
+		default:
+			/*
+			 * B-channel.
+			 *
+			 * We don't know yet whether the datastream is
+			 * V.120 or not; this heuristic tries to figure
+			 * that out.
+			 *
+			 * We cannot glean this from the Q.931 SETUP message,
+			 * because no commercial V.120 implementation I've
+			 * seen actually sets the V.120 protocol discriminator
+			 * (that, or I'm misreading the spec badly).
+			 *
+			 * TODO: close the circuit after a close on the B
+			 * channel is detected.
+			 *
+			 *	-Bert Driehuis (from the i4btrace reader;
+			 *	 this heuristic was moved from there to
+			 *	 here)
+			 *
+			 * XXX - I don't know that one can guarantee that
+			 * the SABME will appear in the first frame on
+			 * the channels, so we probably can't just say
+			 * "it must be PPP" if we don't immediately see
+			 * the V.120 SABME frame, so we do so only if
+			 * we see the 0xFF 0x03.  Unfortunately, that
+			 * won't do the right thing if the PPP-over-HDLC
+			 * headers aren't being used....
+			 */
+			if (tvb_memeql(tvb, 0, v120_sabme, 3) == 0) {
+				/*
+				 * We assume this is V.120.
+				 */
+				conversation_set_dissector(conv, v120_handle);
+			} else if (tvb_memeql(tvb, 0, ppp, 2) == 0) {
+				/*
+				 * We assume this is PPP.
+				 */
+				conversation_set_dissector(conv, ppp_hdlc_handle);
+			}
+			break;
+		}
+	}
+
+	if (!try_conversation_dissector_by_id(CONVERSATION_ISDN, isdn->channel,
+		tvb, pinfo, tree, data))
+		call_data_dissector(tvb, pinfo, tree);
+
+	return tvb_captured_length(tvb);
+}
+
+void
+proto_register_isdn(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_isdn_direction,
+		{ "Direction", "isdn.direction", FT_BOOLEAN, BASE_NONE,
+		  TFS(&isdn_direction_tfs), 0x0, NULL, HFILL }},
+
+		{ &hf_isdn_channel,
+		{ "Channel",	"isdn.channel", FT_UINT8, BASE_DEC,
+		  VALS(channel_vals), 0x0, NULL, HFILL }},
+	};
+	static gint *ett[] = {
+		&ett_isdn,
+	};
+	module_t *isdn_module;
+
+	proto_isdn = proto_register_protocol("ISDN", "ISDN", "isdn");
+	proto_register_field_array(proto_isdn, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	isdn_module = prefs_register_protocol(proto_isdn, NULL);
+
+	prefs_register_enum_preference(isdn_module, "dchannel_protocol",
+	    "D-channel protocol",
+	    "The protocol running on the D channel",
+	    &dchannel_protocol, dchannel_protocol_options, FALSE);
+
+	isdn_handle = register_dissector("isdn", dissect_isdn, proto_isdn);
+}
+
+void
+proto_reg_handoff_isdn(void)
+{
+	/*
+	 * Get handles for the LAPD-with-pseudoheader, DPNSS link-layer,
+	 * PPP, and V.120 dissectors.
+	 */
+	lapd_phdr_handle = find_dissector("lapd-phdr");
+	dpnss_link_handle = find_dissector("dpnss_link");
+	ppp_hdlc_handle = find_dissector("ppp_hdlc");
+	v120_handle = find_dissector("v120");
+
+	dissector_add_uint("wtap_encap", WTAP_ENCAP_ISDN, isdn_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:
+ */