forked from osmocom/wireshark
204 lines
5.4 KiB
C
204 lines
5.4 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
|
|
*
|
|
* 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);
|
|
|
|
#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_with_preference("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:
|
|
*/
|