2 * Routines for LPR and LPRng packet disassembly
3 * Gilbert Ramirez <gram@xiexie.org>
5 * $Id: packet-lpd.c,v 1.27 2001/01/22 08:03:45 guy Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@zing.org>
9 * Copyright 1998 Gerald Combs
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #ifdef HAVE_SYS_TYPES_H
32 # include <sys/types.h>
40 #define TCP_PORT_PRINTER 515
42 static int proto_lpd = -1;
43 static int hf_lpd_response = -1;
44 static int hf_lpd_request = -1;
46 static gint ett_lpd = -1;
48 enum lpr_type { request, response, unknown };
50 static gint find_printer_string(tvbuff_t *tvb, int offset);
53 dissect_lpd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
57 enum lpr_type lpr_packet_type;
61 /* This information comes from the LPRng HOWTO, which also describes
62 RFC 1179. http://www.astart.com/lprng/LPRng-HOWTO.html */
63 char *lpd_client_code[] = {
65 "LPC: start print / jobcmd: abort",
66 "LPR: transfer a printer job / jobcmd: receive control file",
67 "LPQ: print short form of queue status / jobcmd: receive data file",
68 "LPQ: print long form of queue status",
70 "LPRng lpc: do control operation",
71 "LPRng lpr: transfer a block format print job",
72 "LPRng lpc: secure command transfer",
73 "LPRng lpq: verbose status information"
75 char *lpd_server_code[] = {
76 "Success: accepted, proceed",
77 "Queue not accepting jobs",
78 "Queue temporarily full, retry later",
79 "Bad job format, do not retry"
82 if (check_col(pinfo->fd, COL_PROTOCOL))
83 col_set_str(pinfo->fd, COL_PROTOCOL, "LPD");
84 if (check_col(pinfo->fd, COL_INFO))
85 col_clear(pinfo->fd, COL_INFO);
87 /* rfc1179 states that all responses are 1 byte long */
88 code = tvb_get_guint8(tvb, 0);
89 if (tvb_reported_length(tvb) == 1) {
90 lpr_packet_type = response;
93 lpr_packet_type = request;
96 lpr_packet_type = unknown;
99 if (check_col(pinfo->fd, COL_INFO)) {
100 if (lpr_packet_type == request) {
101 col_add_str(pinfo->fd, COL_INFO, lpd_client_code[code]);
103 else if (lpr_packet_type == response) {
104 col_set_str(pinfo->fd, COL_INFO, "LPD response");
107 col_set_str(pinfo->fd, COL_INFO, "LPD continuation");
112 ti = proto_tree_add_item(tree, proto_lpd, tvb, 0,
113 tvb_length(tvb), FALSE);
114 lpd_tree = proto_item_add_subtree(ti, ett_lpd);
116 if (lpr_packet_type == response) {
117 proto_tree_add_boolean_hidden(lpd_tree, hf_lpd_response,
120 proto_tree_add_boolean_hidden(lpd_tree, hf_lpd_request,
124 if (lpr_packet_type == request) {
125 printer_len = find_printer_string(tvb, 1);
127 if (code <= 9 && printer_len != -1) {
128 proto_tree_add_text(lpd_tree, tvb, 0, 1,
129 lpd_client_code[code]);
130 proto_tree_add_text(lpd_tree, tvb, 1, printer_len,
131 "Printer/options: %s",
132 tvb_format_text(tvb, 1, printer_len));
135 dissect_data(tvb, 0, pinfo, tree);
138 else if (lpr_packet_type == response) {
140 proto_tree_add_text(lpd_tree, tvb, 0, 1,
141 "Response: %s", lpd_server_code[code]);
144 dissect_data(tvb, 0, pinfo, tree);
148 dissect_data(tvb, 0, pinfo, tree);
155 find_printer_string(tvbuff_t *tvb, int offset)
159 /* try to find end of string, either '\n' or '\0' */
160 i = tvb_find_guint8(tvb, offset, -1, '\0');
162 i = tvb_find_guint8(tvb, offset, -1, '\n');
165 return i - offset; /* length of string */
170 proto_register_lpd(void)
172 static hf_register_info hf[] = {
174 { "Response", "lpd.response",
175 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
176 "TRUE if LPD response" }},
179 { "Request", "lpd.request",
180 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
181 "TRUE if LPD request" }}
183 static gint *ett[] = {
187 proto_lpd = proto_register_protocol("Line Printer Daemon Protocol", "LPD", "lpd");
188 proto_register_field_array(proto_lpd, hf, array_length(hf));
189 proto_register_subtree_array(ett, array_length(ett));
193 proto_reg_handoff_lpd(void)
195 dissector_add("tcp.port", TCP_PORT_PRINTER, &dissect_lpd, proto_lpd);