Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 203 insertions, 0 deletions

diff --git a/epan/dissectors/packet-lpd.c b/epan/dissectors/packet-lpd.c
new file mode 100644
index 00000000..f6065eb1
--- /dev/null
+++ b/epan/dissectors/packet-lpd.c
@@ -0,0 +1,203 @@
+/* packet-lpd.c
+ * Routines for LPR and LPRng packet disassembly
+ * Gilbert Ramirez <gram@alumni.rice.edu>
+ *
+ * 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>
+
+void proto_register_lpd(void);
+void proto_reg_handoff_lpd(void);
+
+static dissector_handle_t lpd_handle;
+
+#define TCP_PORT_PRINTER		515
+
+static int proto_lpd = -1;
+static int hf_lpd_response = -1;
+static int hf_lpd_request = -1;
+static int hf_lpd_client_code = -1;
+static int hf_lpd_printer_option = -1;
+static int hf_lpd_response_code = -1;
+
+static gint ett_lpd = -1;
+
+enum lpr_type { request, response, unknown };
+
+static gint find_printer_string(tvbuff_t *tvb, int offset);
+
+/* This information comes from the LPRng HOWTO, which also describes
+	RFC 1179. http://www.astart.com/lprng/LPRng-HOWTO.html */
+static const value_string lpd_client_code[] = {
+	{ 1, "LPC: start print / jobcmd: abort" },
+	{ 2, "LPR: transfer a printer job / jobcmd: receive control file" },
+	{ 3, "LPQ: print short form of queue status / jobcmd: receive data file" },
+	{ 4, "LPQ: print long form of queue status" },
+	{ 5, "LPRM: remove jobs" },
+	{ 6, "LPRng lpc: do control operation" },
+	{ 7, "LPRng lpr: transfer a block format print job" },
+	{ 8, "LPRng lpc: secure command transfer" },
+	{ 9, "LPRng lpq: verbose status information" },
+	{ 0, NULL }
+};
+static const value_string lpd_server_code[] = {
+	{ 0, "Success: accepted, proceed" },
+	{ 1, "Queue not accepting jobs" },
+	{ 2, "Queue temporarily full, retry later" },
+	{ 3, "Bad job format, do not retry" },
+	{ 0, NULL }
+};
+
+static int
+dissect_lpd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+	proto_tree	*lpd_tree;
+	proto_item	*ti, *hidden_item;
+	enum lpr_type	lpr_packet_type;
+	guint8		code;
+	gint		printer_len;
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "LPD");
+	col_clear(pinfo->cinfo, COL_INFO);
+
+	/* rfc1179 states that all responses are 1 byte long */
+	code = tvb_get_guint8(tvb, 0);
+	if (tvb_reported_length(tvb) == 1) {
+		lpr_packet_type = response;
+	}
+	else if (code <= 9) {
+		lpr_packet_type = request;
+	}
+	else {
+		lpr_packet_type = unknown;
+	}
+
+	if (lpr_packet_type == request && code !=0) {
+		col_add_str(pinfo->cinfo, COL_INFO, val_to_str(code, lpd_client_code, "Unknown client code: %u"));
+	}
+	else if (lpr_packet_type == response) {
+		col_set_str(pinfo->cinfo, COL_INFO, "LPD response");
+	}
+	else {
+		col_set_str(pinfo->cinfo, COL_INFO, "LPD continuation");
+	}
+
+		ti = proto_tree_add_item(tree, proto_lpd, tvb, 0, -1, ENC_NA);
+		lpd_tree = proto_item_add_subtree(ti, ett_lpd);
+
+		if (lpr_packet_type == response) {
+		  hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_response,
+		  				tvb, 0, 0, TRUE);
+		} else {
+		  hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_request,
+		  				tvb, 0, 0, TRUE);
+		}
+		proto_item_set_hidden(hidden_item);
+
+		if (lpr_packet_type == request) {
+			printer_len = find_printer_string(tvb, 1);
+
+			if (code <= 9 && printer_len != -1) {
+				proto_tree_add_uint_format(lpd_tree, hf_lpd_client_code, tvb, 0, 1, code,
+					"%s", val_to_str(code, lpd_client_code, "Unknown client code: %u"));
+				proto_tree_add_item(lpd_tree, hf_lpd_printer_option, tvb, 1, printer_len, ENC_ASCII);
+			}
+			else {
+				call_data_dissector(tvb, pinfo, lpd_tree);
+			}
+		}
+		else if (lpr_packet_type == response) {
+			if (code <= 3) {
+				proto_tree_add_item(lpd_tree, hf_lpd_response_code, tvb, 0, 1, ENC_BIG_ENDIAN);
+			}
+			else {
+				call_data_dissector(tvb, pinfo, lpd_tree);
+			}
+		}
+		else {
+			call_data_dissector(tvb, pinfo, lpd_tree);
+		}
+
+	return tvb_captured_length(tvb);
+}
+
+
+static gint
+find_printer_string(tvbuff_t *tvb, int offset)
+{
+	int	i;
+
+	/* try to find end of string, either '\n' or '\0' */
+	i = tvb_find_guint8(tvb, offset, -1, '\0');
+	if (i == -1)
+		i = tvb_find_guint8(tvb, offset, -1, '\n');
+	if (i == -1)
+		return -1;
+	return i - offset;	/* length of string */
+}
+
+
+void
+proto_register_lpd(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_lpd_response,
+		  { "Response",           "lpd.response",
+		    FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+		    "TRUE if LPD response", HFILL }},
+
+		{ &hf_lpd_request,
+		  { "Request",            "lpd.request",
+		    FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+		    "TRUE if LPD request", HFILL }},
+
+		{ &hf_lpd_client_code,
+		  { "Client code",            "lpd.client_code",
+		    FT_UINT8, BASE_DEC, VALS(lpd_client_code), 0x0,
+		    NULL, HFILL }},
+
+		{ &hf_lpd_printer_option,
+		  { "Printer/options",            "lpd.printer_option",
+		    FT_STRING, BASE_NONE, NULL, 0x0,
+		    NULL, HFILL }},
+
+		{ &hf_lpd_response_code,
+		  { "Response",            "lpd.response_code",
+		    FT_UINT8, BASE_DEC, VALS(lpd_server_code), 0x0,
+		    NULL, HFILL }},
+	};
+	static gint *ett[] = {
+		&ett_lpd,
+	};
+
+	proto_lpd = proto_register_protocol("Line Printer Daemon Protocol", "LPD", "lpd");
+	lpd_handle = register_dissector("lpd", dissect_lpd, proto_lpd);
+	proto_register_field_array(proto_lpd, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_lpd(void)
+{
+	dissector_add_uint_with_preference("tcp.port", TCP_PORT_PRINTER, lpd_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:
+ */