Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 212 insertions, 0 deletions

diff --git a/epan/dissectors/packet-sdlc.c b/epan/dissectors/packet-sdlc.c
new file mode 100644
index 00000000..78a571a6
--- /dev/null
+++ b/epan/dissectors/packet-sdlc.c
@@ -0,0 +1,212 @@
+/* packet-sdlc.c
+ * Routines for SDLC frame disassembly
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <wiretap/wtap.h>
+#include <epan/xdlc.h>
+
+/*
+ * See:
+ *
+ * http://web.archive.org/web/20020206033700/http://www.wanresources.com/snacell.html
+ *
+ * http://web.archive.org/web/20150522015710/http://www.protocols.com/pbook/sna.htm
+ *
+ * Systems Network Architecture Formats, GA27-3136-20:
+ * https://publibz.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/D50A5007/CCONTENTS
+ */
+void proto_register_sdlc(void);
+void proto_reg_handoff_sdlc(void);
+
+static dissector_handle_t sdlc_handle;
+
+static int proto_sdlc = -1;
+static int hf_sdlc_address = -1;
+static int hf_sdlc_control = -1;
+static int hf_sdlc_n_r = -1;
+static int hf_sdlc_n_s = -1;
+static int hf_sdlc_p = -1;
+static int hf_sdlc_f = -1;
+static int hf_sdlc_s_ftype = -1;
+static int hf_sdlc_u_modifier_cmd = -1;
+static int hf_sdlc_u_modifier_resp = -1;
+static int hf_sdlc_ftype_i = -1;
+static int hf_sdlc_ftype_s_u = -1;
+
+static gint ett_sdlc = -1;
+static gint ett_sdlc_control = -1;
+
+static dissector_handle_t sna_handle;
+
+static const xdlc_cf_items sdlc_cf_items = {
+	&hf_sdlc_n_r,
+	&hf_sdlc_n_s,
+	&hf_sdlc_p,
+	&hf_sdlc_f,
+	&hf_sdlc_s_ftype,
+	&hf_sdlc_u_modifier_cmd,
+	&hf_sdlc_u_modifier_resp,
+	&hf_sdlc_ftype_i,
+	&hf_sdlc_ftype_s_u
+};
+
+static int
+dissect_sdlc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+	proto_tree	*sdlc_tree;
+	proto_item	*sdlc_ti;
+	guint8		addr;
+	guint16		control;
+	int		sdlc_header_len;
+	gboolean	is_response;
+	tvbuff_t	*next_tvb;
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "SDLC");
+	col_clear(pinfo->cinfo, COL_INFO);
+
+	addr = tvb_get_guint8(tvb, 0);
+	sdlc_header_len = 1;	/* address */
+
+	/*
+	 * XXX - is there something in the SDLC header that indicates
+	 * how to interpret "command vs. response" based on the
+	 * direction?
+	 */
+	if (pinfo->p2p_dir == P2P_DIR_SENT) {
+		is_response = FALSE;
+		col_set_str(pinfo->cinfo, COL_RES_DL_DST, "DCE");
+		col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "DTE");
+	}
+	else {
+		/* XXX - what if the direction is unknown? */
+		is_response = TRUE;
+		col_set_str(pinfo->cinfo, COL_RES_DL_DST, "DTE");
+		col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "DCE");
+	}
+
+	sdlc_ti = proto_tree_add_item(tree, proto_sdlc, tvb, 0, -1,
+		ENC_NA);
+	sdlc_tree = proto_item_add_subtree(sdlc_ti, ett_sdlc);
+
+	proto_tree_add_uint(sdlc_tree, hf_sdlc_address, tvb, 0, 1,
+		addr);
+
+	/*
+	 * XXX - SDLC has a mod-128 mode as well as a mod-7 mode.
+	 * We can infer the mode from an SNRM/SRME frame, but if
+	 * we don't see one of them, we may have to have a preference
+	 * to control what to use.
+	 */
+	control = dissect_xdlc_control(tvb, 1, pinfo, sdlc_tree, hf_sdlc_control,
+	    ett_sdlc_control, &sdlc_cf_items, NULL, NULL, NULL,
+	    is_response, FALSE, FALSE);
+	sdlc_header_len += XDLC_CONTROL_LEN(control, FALSE);
+
+	proto_item_set_len(sdlc_ti, sdlc_header_len);
+
+	/*
+	 * XXX - is there an FCS at the end, at least in Sniffer
+	 * captures?  (There doesn't appear to be.)
+	 */
+	next_tvb = tvb_new_subset_remaining(tvb, sdlc_header_len);
+	if (XDLC_IS_INFORMATION(control)) {
+		/* call the SNA dissector */
+		call_dissector(sna_handle, next_tvb, pinfo, tree);
+	} else
+		call_data_dissector(next_tvb, pinfo, tree);
+
+	return tvb_captured_length(tvb);
+}
+
+void
+proto_register_sdlc(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_sdlc_address,
+		  { "Address Field", "sdlc.address", FT_UINT8, BASE_HEX,
+		    NULL, 0x0, "Address", HFILL }},
+
+		{ &hf_sdlc_control,
+		  { "Control Field", "sdlc.control", FT_UINT16, BASE_HEX,
+		    NULL, 0x0, NULL, HFILL }},
+
+		{ &hf_sdlc_n_r,
+		  { "N(R)", "sdlc.control.n_r", FT_UINT8, BASE_DEC,
+		    NULL, XDLC_N_R_MASK, NULL, HFILL }},
+
+		{ &hf_sdlc_n_s,
+		  { "N(S)", "sdlc.control.n_s", FT_UINT8, BASE_DEC,
+		    NULL, XDLC_N_S_MASK, NULL, HFILL }},
+
+		{ &hf_sdlc_p,
+		  { "Poll", "sdlc.control.p", FT_BOOLEAN, 8,
+		    TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }},
+
+		{ &hf_sdlc_f,
+		  { "Final", "sdlc.control.f", FT_BOOLEAN, 8,
+		    TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }},
+
+		{ &hf_sdlc_s_ftype,
+		  { "Supervisory frame type", "sdlc.control.s_ftype", FT_UINT8, BASE_HEX,
+		    VALS(stype_vals), XDLC_S_FTYPE_MASK, NULL, HFILL }},
+
+		{ &hf_sdlc_u_modifier_cmd,
+		  { "Command", "sdlc.control.u_modifier_cmd", FT_UINT8, BASE_HEX,
+		    VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK, NULL, HFILL }},
+
+		{ &hf_sdlc_u_modifier_resp,
+		  { "Response", "sdlc.control.u_modifier_resp", FT_UINT8, BASE_HEX,
+		    VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK, NULL, HFILL }},
+
+		{ &hf_sdlc_ftype_i,
+		  { "Frame type", "sdlc.control.ftype", FT_UINT8, BASE_HEX,
+		    VALS(ftype_vals), XDLC_I_MASK, NULL, HFILL }},
+
+		{ &hf_sdlc_ftype_s_u,
+		  { "Frame type", "sdlc.control.ftype", FT_UINT8, BASE_HEX,
+		    VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }},
+	};
+	static gint *ett[] = {
+		&ett_sdlc,
+		&ett_sdlc_control,
+	};
+
+	proto_sdlc = proto_register_protocol("Synchronous Data Link Control (SDLC)", "SDLC", "sdlc");
+	proto_register_field_array(proto_sdlc, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	sdlc_handle = register_dissector("sdlc", dissect_sdlc, proto_sdlc);
+}
+
+void
+proto_reg_handoff_sdlc(void)
+{
+	/*
+	 * Get handle for the SNA dissector.
+	 */
+	sna_handle = find_dissector_add_dependency("sna", proto_sdlc);
+
+	dissector_add_uint("wtap_encap", WTAP_ENCAP_SDLC, sdlc_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:
+ */