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/* packet-usb-printer.c
*
* Copyright 2020, Martin Kaiser <martin@kaiser.cx>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* References:
*
* USB printer class specification
* https://www.usb.org/sites/default/files/usbprint11a021811.pdf
*
* IEEE 1284 (parallel peripheral interface for personal computers)
* http://kazus.ru/nuke/modules/Downloads/pub/148/0/IEEE%201284-2000.pdf
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/proto.h>
#include "packet-usb.h"
#include <epan/value_string.h>
static dissector_handle_t usb_printer_ctl_handle;
static int proto_usb_printer = -1;
static int hf_usb_printer_req = -1;
static int hf_usb_printer_cfg_idx = -1;
static int hf_usb_printer_intf = -1;
static int hf_usb_printer_alt_set = -1;
static int hf_usb_printer_max_len = -1;
static int hf_usb_printer_dev_id_len = -1;
static int hf_usb_printer_dev_id = -1;
static gint ett_usb_printer = -1;
void proto_register_usb_printer(void);
void proto_reg_handoff_usb_printer(void);
#define REQ_GET_DEV_ID 0
#define REQ_GET_PORT_STAT 1
#define REQ_GET_SOFT_RST 2
static const value_string usb_printer_req[] = {
{ REQ_GET_DEV_ID, "GET_DEVICE_ID" },
{ REQ_GET_PORT_STAT, "GET_PORT_STATUS" },
{ REQ_GET_SOFT_RST, "SOFT_RESET" },
{ 0, NULL }
};
static gint dissect_usb_printer_ctl(
tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
gboolean is_request = (pinfo->srcport == NO_ENDPOINT);
usb_conv_info_t *usb_conv_info = (usb_conv_info_t *)data;
usb_trans_info_t *usb_trans_info;
gint offset = 0;
guint8 bReq;
guint32 dev_id_len;
if (!usb_conv_info)
return 0;
usb_trans_info = usb_conv_info->usb_trans_info;
if (!usb_trans_info)
return 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "USBPRINTER");
col_set_str(pinfo->cinfo, COL_INFO,
val_to_str_const(usb_trans_info->setup.request,
usb_printer_req, "Invalid"));
if (is_request) {
col_append_fstr(pinfo->cinfo, COL_INFO, " request");
bReq = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_usb_printer_req,
tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset++;
if (bReq == REQ_GET_DEV_ID) {
/* Generally, fields in USB messages are little endian. */
proto_tree_add_item(tree, hf_usb_printer_cfg_idx,
tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tree, hf_usb_printer_intf,
tvb, offset, 2, ENC_LITTLE_ENDIAN);
proto_tree_add_item(tree, hf_usb_printer_alt_set,
tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tree, hf_usb_printer_max_len,
tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
}
}
else {
col_append_fstr(pinfo->cinfo, COL_INFO, " response");
if (usb_trans_info->setup.request == REQ_GET_DEV_ID) {
/*
* A printer's Device ID is defined in IEEE 1284, section 7.6.
* It starts with a 16-bit length field in big endian encoding.
* The length field includes the two bytes for itself. Therefore,
* we can't use an FT_UINT_STRING for the entire Device ID.
* The actual Device ID string consists of ASCII characters.
*/
proto_tree_add_item_ret_uint(tree, hf_usb_printer_dev_id_len,
tvb, offset, 2, ENC_BIG_ENDIAN, &dev_id_len);
offset += 2;
if (dev_id_len > 2) {
proto_tree_add_item(tree, hf_usb_printer_dev_id,
tvb, offset, dev_id_len-2, ENC_ASCII);
offset += dev_id_len-2;
}
/* XXX - expert info for invalid dev_id_len */
}
}
return offset;
}
void proto_register_usb_printer(void)
{
static hf_register_info hf[] = {
{ &hf_usb_printer_req,
{ "bRequest", "usbprinter.bRequest", FT_UINT8, BASE_HEX,
VALS(usb_printer_req), 0x0, NULL, HFILL }
},
{ &hf_usb_printer_cfg_idx,
{ "Config index", "usbprinter.config_index", FT_UINT16, BASE_HEX,
NULL, 0x0, NULL, HFILL }
},
{ &hf_usb_printer_intf,
{ "Interface", "usbprinter.interface", FT_UINT16, BASE_HEX,
NULL, 0xFF00, NULL, HFILL }
},
{ &hf_usb_printer_alt_set,
{ "Alternate setting", "usbprinter.alt_set", FT_UINT16, BASE_HEX,
NULL, 0x00FF, NULL, HFILL }
},
{ &hf_usb_printer_max_len,
{ "Maximum length", "usbprinter.max_len", FT_UINT16, BASE_HEX,
NULL, 0, NULL, HFILL }
},
{ &hf_usb_printer_dev_id_len,
{ "Device ID length", "usbprinter.device_id_len", FT_UINT16,
BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_usb_printer_dev_id,
{ "Device ID", "usbprinter.device_id", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
}
};
static gint *ett[] = {
&ett_usb_printer
};
proto_usb_printer = proto_register_protocol("USB Printer", "USBPRINTER", "usbprinter");
proto_register_field_array(proto_usb_printer, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
usb_printer_ctl_handle = register_dissector("usbprinter", dissect_usb_printer_ctl, proto_usb_printer);
}
void
proto_reg_handoff_usb_printer(void)
{
dissector_add_uint("usb.control", IF_CLASS_PRINTER, usb_printer_ctl_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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