2 * Routines for LPR and LPRng packet disassembly
3 * Gilbert Ramirez <gram@alumni.rice.edu>
7 * Wireshark - Network traffic analyzer
8 * By Gerald Combs <gerald@wireshark.org>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #include <epan/packet.h>
33 #define TCP_PORT_PRINTER 515
35 static int proto_lpd = -1;
36 static int hf_lpd_response = -1;
37 static int hf_lpd_request = -1;
39 static gint ett_lpd = -1;
41 enum lpr_type { request, response, unknown };
43 static gint find_printer_string(tvbuff_t *tvb, int offset);
45 static dissector_handle_t data_handle;
48 dissect_lpd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
51 proto_item *ti, *hidden_item;
52 enum lpr_type lpr_packet_type;
56 /* This information comes from the LPRng HOWTO, which also describes
57 RFC 1179. http://www.astart.com/lprng/LPRng-HOWTO.html */
58 static const value_string lpd_client_code[] = {
59 { 1, "LPC: start print / jobcmd: abort" },
60 { 2, "LPR: transfer a printer job / jobcmd: receive control file" },
61 { 3, "LPQ: print short form of queue status / jobcmd: receive data file" },
62 { 4, "LPQ: print long form of queue status" },
63 { 5, "LPRM: remove jobs" },
64 { 6, "LPRng lpc: do control operation" },
65 { 7, "LPRng lpr: transfer a block format print job" },
66 { 8, "LPRng lpc: secure command transfer" },
67 { 9, "LPRng lpq: verbose status information" },
70 static const value_string lpd_server_code[] = {
71 { 0, "Success: accepted, proceed" },
72 { 1, "Queue not accepting jobs" },
73 { 2, "Queue temporarily full, retry later" },
74 { 3, "Bad job format, do not retry" },
78 col_set_str(pinfo->cinfo, COL_PROTOCOL, "LPD");
79 col_clear(pinfo->cinfo, COL_INFO);
81 /* rfc1179 states that all responses are 1 byte long */
82 code = tvb_get_guint8(tvb, 0);
83 if (tvb_reported_length(tvb) == 1) {
84 lpr_packet_type = response;
87 lpr_packet_type = request;
90 lpr_packet_type = unknown;
93 if (check_col(pinfo->cinfo, COL_INFO)) {
94 if (lpr_packet_type == request && code !=0) {
95 col_add_str(pinfo->cinfo, COL_INFO, val_to_str(code, lpd_client_code, "Unknown client code: %u"));
97 else if (lpr_packet_type == response) {
98 col_set_str(pinfo->cinfo, COL_INFO, "LPD response");
101 col_set_str(pinfo->cinfo, COL_INFO, "LPD continuation");
106 ti = proto_tree_add_item(tree, proto_lpd, tvb, 0, -1, FALSE);
107 lpd_tree = proto_item_add_subtree(ti, ett_lpd);
109 if (lpr_packet_type == response) {
110 hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_response,
113 hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_request,
116 PROTO_ITEM_SET_HIDDEN(hidden_item);
118 if (lpr_packet_type == request) {
119 printer_len = find_printer_string(tvb, 1);
121 if (code <= 9 && printer_len != -1) {
122 proto_tree_add_text(lpd_tree, tvb, 0, 1, "%s",
123 val_to_str(code, lpd_client_code, "Unknown client code: %u"));
124 proto_tree_add_text(lpd_tree, tvb, 1, printer_len,
125 "Printer/options: %s",
126 tvb_format_text(tvb, 1, printer_len));
129 call_dissector(data_handle,tvb, pinfo, lpd_tree);
132 else if (lpr_packet_type == response) {
134 proto_tree_add_text(lpd_tree, tvb, 0, 1,
135 "Response: %s", val_to_str(code, lpd_server_code, "Unknown server code: %u"));
138 call_dissector(data_handle,tvb, pinfo, lpd_tree);
142 call_dissector(data_handle,tvb, pinfo, lpd_tree);
149 find_printer_string(tvbuff_t *tvb, int offset)
153 /* try to find end of string, either '\n' or '\0' */
154 i = tvb_find_guint8(tvb, offset, -1, '\0');
156 i = tvb_find_guint8(tvb, offset, -1, '\n');
159 return i - offset; /* length of string */
164 proto_register_lpd(void)
166 static hf_register_info hf[] = {
168 { "Response", "lpd.response",
169 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
170 "TRUE if LPD response", HFILL }},
173 { "Request", "lpd.request",
174 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
175 "TRUE if LPD request", HFILL }}
177 static gint *ett[] = {
181 proto_lpd = proto_register_protocol("Line Printer Daemon Protocol", "LPD", "lpd");
182 proto_register_field_array(proto_lpd, hf, array_length(hf));
183 proto_register_subtree_array(ett, array_length(ett));
187 proto_reg_handoff_lpd(void)
189 dissector_handle_t lpd_handle;
191 lpd_handle = create_dissector_handle(dissect_lpd, proto_lpd);
192 dissector_add_uint("tcp.port", TCP_PORT_PRINTER, lpd_handle);
193 data_handle = find_dissector("data");