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pcsc-lite: read vendor id and product id from USB device

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Fixes #3211
This commit is contained in:
Christian Prochaska 2019-03-05 19:35:46 +01:00 committed by Christian Helmuth
parent 4796f761b8
commit 2a71c8fa82
4 changed files with 28 additions and 37 deletions
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2
repos/libports/lib/mk/pcsc-lite.mk
View File

@ -2,7 +2,7 @@ PCSC_LITE_DIR := $(call select_from_ports,pcsc-lite)/src/lib/pcsc-lite
include $(call select_from_repositories,lib/import/import-pcsc-lite.mk)
LIBS += ccid libc
LIBS += ccid libc libusb
# find 'config.h'
INC_DIR += $(REP_DIR)/src/lib/pcsc-lite

3
repos/libports/run/smartcard.run
View File

@ -112,9 +112,6 @@ append config {
<rom name="Info.plist"/>
</dir>
</dir>
<inline name="config.pcsc-lite">
<config vendor_id="} [smartcard_vendor_id] {" product_id="} [smartcard_product_id] {"/>
</inline>
</vfs>
<libc stdout="/dev/log" stderr="/dev/log" rtc="/dev/rtc"/>
</config>

16
repos/libports/src/lib/pcsc-lite/README
View File

@ -1,12 +1,4 @@
The USB card reader to be used by an application must be configured with its
vendor id and product id in a file '/config.pcsc-lite':
<config>
<libc>
<vfs>
<inline name="config.pcsc-lite">
<config vendor_id="0xXXXX" product_id="0xXXXX"/>
</inline>
</vfs>
</libc>
</config>
The library uses the first (and currently the only) USB device reported by
libusb as smartcard reader. The actual selection of the USB device to use is
done by the USB driver according to its configured policy for the 'Usb' session
with the label 'usb_device', which is used by libusb to access the device.

44
repos/libports/src/lib/pcsc-lite/init.cc
View File

@ -21,6 +21,9 @@
#include <stdlib.h>
#include <unistd.h>
/* libusb includes */
#include <libusb.h>
/* pcsc-lite includes */
extern "C" {
#include <debuglog.h>
@ -42,39 +45,38 @@ struct Pcsc_lite_initializer
(void)DebugLogSetCategory(DEBUG_CATEGORY_APDU);
}
unsigned int vendor_id = 0x0000;
unsigned int product_id = 0x0000;
/*
* Find out vendor id and product id of the connected USB device
* and add it as reader.
*/
int fd = open("/config.pcsc-lite", O_RDONLY);
libusb_context *ctx = nullptr;
if (fd < 0) {
Genode::error("Could not open 'config.pcsc-lite'");
exit(1);
}
char config[128];
if (read(fd, config, sizeof(config)) < 0) {
Genode::error("Could not read 'config.pcsc-lite'");
libusb_init(&ctx);
libusb_device **devs = nullptr;
if (libusb_get_device_list(ctx, &devs) < 1) {
Genode::error("Could not find a USB device.");
exit(1);
}
try {
struct libusb_device_descriptor device_descriptor;
Genode::Xml_node config_node(config);
vendor_id = config_node.attribute_value("vendor_id", 0U);
product_id = config_node.attribute_value("product_id", 0U);
} catch (...) {
Genode::error("Error parsing 'config.pcsc-lite'");
if (libusb_get_device_descriptor(devs[0], &device_descriptor) < 0) {
Genode::error("Could not read the device descriptor of the "
"USB device.");
exit(1);
}
close(fd);
libusb_free_device_list(devs, 1);
libusb_exit(ctx);
char device[14];
snprintf(device, sizeof(device), "usb:%04x/%04x", vendor_id, product_id);
snprintf(device, sizeof(device), "usb:%04x/%04x",
device_descriptor.idVendor, device_descriptor.idProduct);
RFAllocateReaderSpace(0);
(void)RFAddReader("CCID", 0, "/", device);