2 * Routines for LPR and LPRng packet disassembly
3 * Gilbert Ramirez <gram@alumni.rice.edu>
5 * $Id: packet-lpd.c,v 1.37 2002/08/28 21:00:20 jmayer Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
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.
33 #include <epan/packet.h>
35 #define TCP_PORT_PRINTER 515
37 static int proto_lpd = -1;
38 static int hf_lpd_response = -1;
39 static int hf_lpd_request = -1;
41 static gint ett_lpd = -1;
43 enum lpr_type { request, response, unknown };
45 static gint find_printer_string(tvbuff_t *tvb, int offset);
47 static dissector_handle_t data_handle;
50 dissect_lpd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
54 enum lpr_type lpr_packet_type;
58 /* This information comes from the LPRng HOWTO, which also describes
59 RFC 1179. http://www.astart.com/lprng/LPRng-HOWTO.html */
60 static char *lpd_client_code[] = {
62 "LPC: start print / jobcmd: abort",
63 "LPR: transfer a printer job / jobcmd: receive control file",
64 "LPQ: print short form of queue status / jobcmd: receive data file",
65 "LPQ: print long form of queue status",
67 "LPRng lpc: do control operation",
68 "LPRng lpr: transfer a block format print job",
69 "LPRng lpc: secure command transfer",
70 "LPRng lpq: verbose status information"
72 static char *lpd_server_code[] = {
73 "Success: accepted, proceed",
74 "Queue not accepting jobs",
75 "Queue temporarily full, retry later",
76 "Bad job format, do not retry"
79 if (check_col(pinfo->cinfo, COL_PROTOCOL))
80 col_set_str(pinfo->cinfo, COL_PROTOCOL, "LPD");
81 if (check_col(pinfo->cinfo, COL_INFO))
82 col_clear(pinfo->cinfo, COL_INFO);
84 /* rfc1179 states that all responses are 1 byte long */
85 code = tvb_get_guint8(tvb, 0);
86 if (tvb_reported_length(tvb) == 1) {
87 lpr_packet_type = response;
90 lpr_packet_type = request;
93 lpr_packet_type = unknown;
96 if (check_col(pinfo->cinfo, COL_INFO)) {
97 if (lpr_packet_type == request) {
98 col_set_str(pinfo->cinfo, COL_INFO, lpd_client_code[code]);
100 else if (lpr_packet_type == response) {
101 col_set_str(pinfo->cinfo, COL_INFO, "LPD response");
104 col_set_str(pinfo->cinfo, COL_INFO, "LPD continuation");
109 ti = proto_tree_add_item(tree, proto_lpd, tvb, 0, -1, FALSE);
110 lpd_tree = proto_item_add_subtree(ti, ett_lpd);
112 if (lpr_packet_type == response) {
113 proto_tree_add_boolean_hidden(lpd_tree, hf_lpd_response,
116 proto_tree_add_boolean_hidden(lpd_tree, hf_lpd_request,
120 if (lpr_packet_type == request) {
121 printer_len = find_printer_string(tvb, 1);
123 if (code <= 9 && printer_len != -1) {
124 proto_tree_add_text(lpd_tree, tvb, 0, 1,
125 lpd_client_code[code]);
126 proto_tree_add_text(lpd_tree, tvb, 1, printer_len,
127 "Printer/options: %s",
128 tvb_format_text(tvb, 1, printer_len));
131 call_dissector(data_handle,tvb, pinfo, tree);
134 else if (lpr_packet_type == response) {
136 proto_tree_add_text(lpd_tree, tvb, 0, 1,
137 "Response: %s", lpd_server_code[code]);
140 call_dissector(data_handle,tvb, pinfo, tree);
144 call_dissector(data_handle,tvb, pinfo, tree);
151 find_printer_string(tvbuff_t *tvb, int offset)
155 /* try to find end of string, either '\n' or '\0' */
156 i = tvb_find_guint8(tvb, offset, -1, '\0');
158 i = tvb_find_guint8(tvb, offset, -1, '\n');
161 return i - offset; /* length of string */
166 proto_register_lpd(void)
168 static hf_register_info hf[] = {
170 { "Response", "lpd.response",
171 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
172 "TRUE if LPD response", HFILL }},
175 { "Request", "lpd.request",
176 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
177 "TRUE if LPD request", HFILL }}
179 static gint *ett[] = {
183 proto_lpd = proto_register_protocol("Line Printer Daemon Protocol", "LPD", "lpd");
184 proto_register_field_array(proto_lpd, hf, array_length(hf));
185 proto_register_subtree_array(ett, array_length(ett));
189 proto_reg_handoff_lpd(void)
191 dissector_handle_t lpd_handle;
193 lpd_handle = create_dissector_handle(dissect_lpd, proto_lpd);
194 dissector_add("tcp.port", TCP_PORT_PRINTER, lpd_handle);
195 data_handle = find_dissector("data");