forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
216 lines
6 KiB
C
216 lines
6 KiB
C
/* 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
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
|
|
void proto_register_lpd(void);
|
|
void proto_reg_handoff_lpd(void);
|
|
|
|
#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|ENC_NA);
|
|
}
|
|
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");
|
|
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_handle_t lpd_handle;
|
|
|
|
lpd_handle = create_dissector_handle(dissect_lpd, proto_lpd);
|
|
dissector_add_uint("tcp.port", TCP_PORT_PRINTER, lpd_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://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:
|
|
*/
|