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GNU GENERAL PUBLIC LICENSE
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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To do so, attach the following notices to the program. It is safest
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<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or school,
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For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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@@ -1,47 +1,123 @@
# desk-reminder
Simple C program that listens for events from the Alcor Micro AU9540 USB smartcard reader.
![Logo](./docs/icons/256x256/desk-reminder.png)
- USB device: `058f:9540` (Alcor Micro Corp. AU9540 Smartcard Reader)
- Implementation: raw USB using `libusb-1.0`
Small Linux utility that enforces periodic standing desk adjustments. After 20 minutes
sitting, the screen is locked until the user switches to standing mode on their adjustable
standing desk. This works via an ecard reader attached to the back of the computer
screen and the wall, which allows this program to detect when the user is standing or
sitting.
The program opens the reader by VID/PID, locates the first interrupt IN endpoint, and prints any data received (typically slot change / card insertion or removal notifications). It does **not** implement full CCID or smartcard protocols, but is useful for observing low-level traffic.
## What It Does
- Grabs a specific input keyboard device with `EVIOCGRAB`, so key events from that device are hidden from other applications.
- Reads digit key presses (`0-9`) until `Enter`.
- Hashes the entered numeric string with SHA-256 and compares the first 8 bytes (as a 64-bit number) against a hardcoded value.
- If the hash matches, it resets the standing timer, kills `i3lock`, and re-enables keyboards.
- A background watcher thread checks elapsed time every second.
- Once elapsed time reaches the configured interval, it disables keyboard devices via `xinput` and starts `i3lock` with a lockscreen image.
Default interval is 20 minutes.
## Dependencies
Build-time:
- GCC
- OpenSSL development headers/libraries (`libssl-dev` on Debian/Ubuntu)
- POSIX threads (`pthread`)
- Linux input headers (`linux/input.h`)
Runtime:
- `xinput`
- `i3lock`
- X11 session (because keyboard disabling uses `xinput`)
- Permission to read the target input device in `/dev/input/by-id/...`
## Build
On Debian/Ubuntu and similar, install the development package:
The current `Makefile` does not match the source filename in this repository (`desk-reminder.c`), so compile directly:
```sh
sudo apt-get update
sudo apt-get install libusb-1.0-0-dev
```bash
gcc -Wall -Wextra -O2 desk-reminder.c -o desk-reminder -lssl -lcrypto -lpthread
```
Then build the program:
## Configure
```sh
cd desk-reminder
make
Edit the hardcoded device path in `desk-reminder.c`:
```c
const char *dev = "/dev/input/by-id/usb-IC_Reader_IC_Reader_08FF20171101-event-kbd";
```
This produces a `desk_reminder` binary.
Use one of these to find your device path:
## Run
You may need root or appropriate udev rules to access USB devices directly:
```sh
cd desk-reminder
sudo ./desk_reminder
```bash
ls -l /dev/input/by-id/
cat /proc/bus/input/devices
```
Expected behavior:
## Usage
- The program prints which bus/device it opened.
- It reports which interrupt IN endpoint it is listening on.
- When the AU9540 reports an event (for example, card insertion/removal), the program prints the raw bytes received.
Run with default interval (20 minutes):
Press `Ctrl+C` to stop the program.
```bash
./desk-reminder
```
## Notes
Set interval explicitly:
```bash
./desk-reminder -i 20m
./desk-reminder -i 1200s
```
`-i` accepts a positive integer and optional unit suffix:
- `s` for seconds
- `m` for minutes (default if no suffix)
Examples:
- `-i 30` means 30 minutes
- `-i 30m` means 30 minutes
- `-i 45s` means 45 seconds
## Operational Notes
- This program grabs the configured device exclusively.
- When timeout is reached, keyboard devices are disabled using:
- `xinput --list --short | grep -i keyboard | grep -v XTEST | ... | xinput disable`
- On successful reset code entry, keyboards are re-enabled with the matching `xinput enable` pipeline.
- Screen lock image is hardcoded to:
- `/usr/local/share/lockscreens/standing_gopher.png`
Ensure this file exists, or adjust the command in source.
## Safety / Recovery
- Keep another input method available during testing (for example, a second terminal/TTY).
- Test with a short interval first (`-i 30s`) to verify behavior.
- If something goes wrong and keyboards remain disabled, use another session/input device to run:
```bash
xinput --list --short | grep -i keyboard | grep -v XTEST | sed -E 's/.*id=([0-9]+).*/\1/' | xargs -r -n1 xinput enable
pkill i3lock
```
## Limitations
- Linux-only.
- X11-specific keyboard management (not Wayland-native).
- Input device path, reset hash target, and lockscreen path are all hardcoded.
- No systemd service/unit is included in this repository.
## License
This project is licensed under the GNU General Public License, version 3.
See `LICENSE` for the full text.
For higher-level smartcard operations (APDU exchange, PIN verification, etc.), you would typically use PC/SC (`pcscd`, `libpcsclite`) instead of talking to the reader via raw USB. This example focuses on listening to the USB interrupt endpoint.

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// Simple listener for Alcor AU9540 smartcard reader using libusb-1.0
// Device: Bus 001 Device 002: ID 058f:9540 Alcor Micro Corp. AU9540 Smartcard Reader
//
// This program opens the USB device by VID/PID, finds the first
// interrupt IN endpoint, and listens for slot change / card events.
// It does not implement full CCID or smartcard protocols; it just
// prints raw bytes received from the interrupt endpoint.
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/input.h>
#include <sys/ioctl.h>
#include <openssl/sha.h>
#include <time.h>
#include <pthread.h>
#include <ctype.h>
#include <libusb-1.0/libusb.h>
// Interval in seconds between reminders (default 20 minutes),
// can be overridden with -i (supports optional s/m suffix).
static unsigned long long interval_seconds = 20ULL * 60ULL;
// Target USB device: IC Reader (Bus 001 Device 011: ID ffff:0035)
#define VENDOR_ID 0xffff
#define PRODUCT_ID 0x0035
// Shared timestamp of when the "standing" event last occurred.
static unsigned long long last_time_standing = 0;
static volatile int keep_running = 1;
static void handle_signal(int signum)
// Map a subset of key codes (digits and Enter) to characters.
static char keycode_to_char(unsigned short code)
{
(void)signum;
keep_running = 0;
switch (code) {
case KEY_0: return '0';
case KEY_1: return '1';
case KEY_2: return '2';
case KEY_3: return '3';
case KEY_4: return '4';
case KEY_5: return '5';
case KEY_6: return '6';
case KEY_7: return '7';
case KEY_8: return '8';
case KEY_9: return '9';
default: return '\0';
}
}
struct listener_context {
libusb_device_handle *handle;
unsigned char endpoint_addr;
};
static void LIBUSB_CALL transfer_callback(struct libusb_transfer *transfer)
// Thread that once per second prints how long it has been since
// last_time_standing was updated.
static void *time_watcher_thread(void *arg)
{
struct listener_context *ctx = (struct listener_context *)transfer->user_data;
if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
printf("[event] %d bytes: ", transfer->actual_length);
for (int i = 0; i < transfer->actual_length; ++i) {
printf("%02x ", transfer->buffer[i]);
}
printf("\n");
(void)arg;
for (;;) {
sleep(1);
unsigned long long now = (unsigned long long)time(NULL);
if (last_time_standing != 0) {
unsigned long long delta = now - last_time_standing;
printf("Seconds since last_time_standing: %llu (interval=%llus)\n",
delta, interval_seconds);
fflush(stdout);
// If we've exceeded the configured interval, lock the screen
if (delta >= interval_seconds) {
// Use xinput to disable all keyboard-like devices until user stands again.
// This pipeline lists input devices, filters keyboards (excluding XTEST),
// extracts their IDs, and disables each one.
system("xinput --list --short | "
"grep -i 'keyboard' | grep -v 'XTEST' | "
"sed -E 's/.*id=([0-9]+).*/\\1/' | "
"xargs -r -n1 xinput disable");
if (keep_running) {
int rc = libusb_submit_transfer(transfer);
if (rc != 0) {
fprintf(stderr, "Failed to resubmit transfer: %s\n", libusb_error_name(rc));
libusb_free_transfer(transfer);
system("i3lock -n -i /usr/local/share/lockscreens/standing_gopher.png");
}
} else {
libusb_free_transfer(transfer);
}
} else if (transfer->status == LIBUSB_TRANSFER_CANCELLED) {
libusb_free_transfer(transfer);
} else {
fprintf(stderr, "Transfer error: status=%d (%s)\n",
transfer->status, libusb_error_name(transfer->status));
libusb_free_transfer(transfer);
}
(void)ctx; // currently unused, kept for future extensions
return NULL;
}
static int find_interrupt_in_endpoint(libusb_device_handle *handle,
unsigned char *endpoint_addr_out)
{
libusb_device *dev = libusb_get_device(handle);
struct libusb_config_descriptor *config = NULL;
int rc = libusb_get_active_config_descriptor(dev, &config);
if (rc != 0) {
fprintf(stderr, "Failed to get config descriptor: %s\n", libusb_error_name(rc));
return -1;
}
int main(int argc, char **argv) {
// Replace with the specific event node for your keyboard
// Use 'lsusb' and 'cat /proc/bus/input/devices' to find the right one
const char *dev = "/dev/input/by-id/usb-IC_Reader_IC_Reader_08FF20171101-event-kbd";
struct input_event ev;
int fd;
int found = 0;
for (int i = 0; i < config->bNumInterfaces && !found; ++i) {
const struct libusb_interface *interface = &config->interface[i];
for (int j = 0; j < interface->num_altsetting && !found; ++j) {
const struct libusb_interface_descriptor *alt = &interface->altsetting[j];
for (int k = 0; k < alt->bNumEndpoints && !found; ++k) {
const struct libusb_endpoint_descriptor *ep = &alt->endpoint[k];
if ((ep->bmAttributes & LIBUSB_TRANSFER_TYPE_MASK) == LIBUSB_TRANSFER_TYPE_INTERRUPT &&
(ep->bEndpointAddress & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_IN) {
*endpoint_addr_out = ep->bEndpointAddress;
found = 1;
}
}
}
}
libusb_free_config_descriptor(config);
if (!found) {
fprintf(stderr, "No interrupt IN endpoint found on device.\n");
return -1;
}
return 0;
}
int main(void)
{
libusb_context *ctx = NULL;
libusb_device_handle *handle = NULL;
int rc;
signal(SIGINT, handle_signal);
signal(SIGTERM, handle_signal);
rc = libusb_init(&ctx);
if (rc != 0) {
fprintf(stderr, "libusb_init failed: %s\n", libusb_error_name(rc));
// Optional: -i <interval>[s|m] to override interval_seconds
int opt;
while ((opt = getopt(argc, argv, "i:")) != -1) {
switch (opt) {
case 'i': {
char *end = NULL;
unsigned long long v = strtoull(optarg, &end, 10);
if (!optarg[0] || end == optarg || v == 0) {
fprintf(stderr, "Invalid interval '%s' for -i (must start with positive integer)\n", optarg);
return EXIT_FAILURE;
}
libusb_set_option(ctx, LIBUSB_OPTION_LOG_LEVEL, LIBUSB_LOG_LEVEL_INFO);
handle = libusb_open_device_with_vid_pid(ctx, VENDOR_ID, PRODUCT_ID);
if (!handle) {
fprintf(stderr, "Unable to open device %04x:%04x. Are you running as root or with correct udev rules?\n",
VENDOR_ID, PRODUCT_ID);
libusb_exit(ctx);
char unit = 'm'; // default unit: minutes
if (*end != '\0') {
// Allow a single unit character 's' or 'm'
if (end[1] != '\0') {
fprintf(stderr, "Invalid interval suffix in '%s' (use optional 's' or 'm')\n", optarg);
return EXIT_FAILURE;
}
libusb_device *dev = libusb_get_device(handle);
uint8_t bus = libusb_get_bus_number(dev);
uint8_t addr = libusb_get_device_address(dev);
printf("Opened device on bus %03u device %03u (VID:PID %04x:%04x)\n",
bus, addr, VENDOR_ID, PRODUCT_ID);
// Try to claim interface 0 (most CCID readers use it). Detach kernel driver if needed.
int iface = 0;
if (libusb_kernel_driver_active(handle, iface) == 1) {
printf("Kernel driver active on interface %d, detaching...\n", iface);
rc = libusb_detach_kernel_driver(handle, iface);
if (rc != 0) {
fprintf(stderr, "Failed to detach kernel driver: %s\n", libusb_error_name(rc));
libusb_close(handle);
libusb_exit(ctx);
unit = (char)tolower((unsigned char)*end);
if (unit != 's' && unit != 'm') {
fprintf(stderr, "Unknown interval unit '%c' in '%s' (use 's' or 'm')\n", *end, optarg);
return EXIT_FAILURE;
}
}
rc = libusb_claim_interface(handle, iface);
if (rc != 0) {
fprintf(stderr, "Failed to claim interface %d: %s\n", iface, libusb_error_name(rc));
libusb_close(handle);
libusb_exit(ctx);
return EXIT_FAILURE;
if (unit == 's') {
interval_seconds = v;
} else { // 'm'
interval_seconds = v * 60ULL;
}
unsigned char endpoint_addr = 0;
if (find_interrupt_in_endpoint(handle, &endpoint_addr) != 0) {
libusb_release_interface(handle, iface);
libusb_close(handle);
libusb_exit(ctx);
return EXIT_FAILURE;
}
printf("Listening on interrupt IN endpoint 0x%02x. Press Ctrl+C to stop.\n",
endpoint_addr);
const int buf_size = 64; // typical interrupt packet size
unsigned char *buffer = (unsigned char *)malloc(buf_size);
if (!buffer) {
fprintf(stderr, "Failed to allocate buffer.\n");
libusb_release_interface(handle, iface);
libusb_close(handle);
libusb_exit(ctx);
return EXIT_FAILURE;
}
struct libusb_transfer *transfer = libusb_alloc_transfer(0);
if (!transfer) {
fprintf(stderr, "Failed to allocate transfer.\n");
free(buffer);
libusb_release_interface(handle, iface);
libusb_close(handle);
libusb_exit(ctx);
return EXIT_FAILURE;
}
struct listener_context listener_ctx;
listener_ctx.handle = handle;
listener_ctx.endpoint_addr = endpoint_addr;
libusb_fill_interrupt_transfer(transfer,
handle,
endpoint_addr,
buffer,
buf_size,
transfer_callback,
&listener_ctx,
0); // timeout 0 = infinite
rc = libusb_submit_transfer(transfer);
if (rc != 0) {
fprintf(stderr, "Failed to submit transfer: %s\n", libusb_error_name(rc));
libusb_free_transfer(transfer);
free(buffer);
libusb_release_interface(handle, iface);
libusb_close(handle);
libusb_exit(ctx);
return EXIT_FAILURE;
}
while (keep_running) {
rc = libusb_handle_events(ctx);
if (rc != 0) {
fprintf(stderr, "libusb_handle_events error: %s\n", libusb_error_name(rc));
break;
}
default:
fprintf(stderr, "Usage: %s [-i interval{s|m}]\n", argv[0]);
return EXIT_FAILURE;
}
}
// Clean up: ask libusb to cancel the transfer; the callback is
// responsible for freeing the transfer and buffer when cancellation
// completes or if an error occurred.
libusb_cancel_transfer(transfer);
fd = open(dev, O_RDONLY);
if (fd == -1) {
perror("Cannot open device");
return EXIT_FAILURE;
}
libusb_release_interface(handle, iface);
libusb_close(handle);
libusb_exit(ctx);
// Grab the device: This blocks all other apps from seeing these keystrokes
if (ioctl(fd, EVIOCGRAB, 1) == -1) {
perror("Could not grab device");
close(fd);
return EXIT_FAILURE;
}
printf("Exiting.\n");
return EXIT_SUCCESS;
printf("Input blocked from %s. Press Ctrl+C in this terminal to stop.\n", dev);
// Buffer to accumulate the characters the reader "types"
char buf_str[128];
size_t buf_len = 0;
// Initialize last_time_standing and start the watcher thread
last_time_standing = (unsigned long long)time(NULL);
pthread_t watcher;
if (pthread_create(&watcher, NULL, time_watcher_thread, NULL) != 0) {
perror("Failed to create watcher thread");
ioctl(fd, EVIOCGRAB, 0);
close(fd);
return EXIT_FAILURE;
}
pthread_detach(watcher);
// Continuous loop to capture events
while (1) {
ssize_t n = read(fd, &ev, sizeof(ev));
if (n == (ssize_t)-1) {
perror("Read error");
break;
} else if (n != sizeof(ev)) {
continue;
}
// Process only key events (type 1)
if (ev.type == EV_KEY) {
if (ev.value == 1) { // key press
if (ev.code == KEY_ENTER || ev.code == KEY_KPENTER) {
// End of the "typed" sequence: print the accumulated string
if (buf_len > 0) {
buf_str[buf_len] = '\0';
long long val = strtoll(buf_str, NULL, 10);
// Get the SHA-256 hash of the value
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256((unsigned char*)buf_str, buf_len, hash);
printf("SHA-256: ");
unsigned long long hash_val = 0;
for (int i = 0; i < 8; i++) {
hash_val = (hash_val << 8) | hash[i];
}
printf(" (as number: %llu)", hash_val);
printf("\n");
printf("Typed: %s (as number: %lld)\n", buf_str, val);
buf_len = 0;
if (hash_val == 4798061567229363866L) {
last_time_standing = (unsigned long long)time(NULL);
printf("Desk reminder timer reset at %llu seconds since epoch.\n", last_time_standing);
system("pkill i3lock");
system("xinput --list --short | "
"grep -i 'keyboard' | grep -v 'XTEST' | "
"sed -E 's/.*id=([0-9]+).*/\\1/' | "
"xargs -r -n1 xinput enable");
}
}
} else {
char c = keycode_to_char(ev.code);
if (c != '\0' && buf_len + 1 < sizeof(buf_str))
buf_str[buf_len++] = c;
}
}
}
}
// Release the grab before exiting
ioctl(fd, EVIOCGRAB, 0);
close(fd);
return 0;
}

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include <winscard.h>
#include <wintypes.h>
// Target USB device: ffff:0035 (IC Reader)
#define VENDOR_ID "ffff"
#define PRODUCT_ID "0035"
static int read_file_trim(const char *path, char *buf, size_t buf_size)
{
FILE *f = fopen(path, "r");
if (!f) return -1;
if (!fgets(buf, (int)buf_size, f)) {
fclose(f);
return -1;
}
fclose(f);
// Trim trailing whitespace/newline
size_t len = strlen(buf);
while (len > 0 && (buf[len - 1] == '\n' || buf[len - 1] == '\r' || buf[len - 1] == ' ' || buf[len - 1] == '\t')) {
buf[--len] = '\0';
}
return 0;
}
// Find the sysfs name of the target USB device under /sys/bus/usb/devices
// (e.g. "1-2"), by matching idVendor/idProduct.
static int find_usb_device_name(char *name_out, size_t name_out_size)
{
const char *base = "/sys/bus/usb/devices";
DIR *dir = opendir(base);
if (!dir) {
perror("opendir /sys/bus/usb/devices");
return -1;
}
struct dirent *ent;
int found = 0;
char path[512];
char vid[16];
char pid[16];
while ((ent = readdir(dir)) != NULL) {
if (ent->d_name[0] == '.') continue;
// Skip interface/function entries like "1-2:1.0"
if (strchr(ent->d_name, ':') != NULL) continue;
snprintf(path, sizeof(path), "%s/%s/idVendor", base, ent->d_name);
if (read_file_trim(path, vid, sizeof(vid)) != 0) continue;
snprintf(path, sizeof(path), "%s/%s/idProduct", base, ent->d_name);
if (read_file_trim(path, pid, sizeof(pid)) != 0) continue;
if (strcmp(vid, VENDOR_ID) == 0 && strcmp(pid, PRODUCT_ID) == 0) {
strncpy(name_out, ent->d_name, name_out_size - 1);
name_out[name_out_size - 1] = '\0';
found = 1;
break;
}
}
closedir(dir);
if (!found) {
fprintf(stderr, "USB device %s:%s not found on this system.\n", VENDOR_ID, PRODUCT_ID);
return -1;
}
return 0;
}
static int write_sysfs(const char *path, const char *value)
{
FILE *f = fopen(path, "w");
if (!f) {
fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
return -1;
}
if (fprintf(f, "%s", value) < 0) {
fprintf(stderr, "Failed to write to %s: %s\n", path, strerror(errno));
fclose(f);
return -1;
}
fclose(f);
return 0;
}
// Disable the reader by unbinding it from the generic USB driver.
static int disable_reader(const char *dev_name)
{
char buf[64];
snprintf(buf, sizeof(buf), "%s\n", dev_name);
printf("Disabling reader %s (USB %s:%s)\n", dev_name, VENDOR_ID, PRODUCT_ID);
return write_sysfs("/sys/bus/usb/drivers/usb/unbind", buf);
}
// Enable the reader by binding it back to the generic USB driver.
static int enable_reader(const char *dev_name)
{
char buf[64];
snprintf(buf, sizeof(buf), "%s\n", dev_name);
printf("Enabling reader %s (USB %s:%s)\n", dev_name, VENDOR_ID, PRODUCT_ID);
return write_sysfs("/sys/bus/usb/drivers/usb/bind", buf);
}
// Trigger a one-shot card scan via PC/SC. Assumes the reader is already
// bound/enabled (use the "on" subcommand first).
static int trigger_scan(void)
{
SCARDCONTEXT ctx;
LONG rv = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &ctx);
if (rv != SCARD_S_SUCCESS) {
fprintf(stderr, "SCardEstablishContext failed: %s\n", pcsc_stringify_error(rv));
return -1;
}
char readers[2048];
DWORD readersLen = sizeof(readers);
rv = SCardListReaders(ctx, NULL, readers, &readersLen);
if (rv != SCARD_S_SUCCESS) {
fprintf(stderr, "SCardListReaders failed: %s\n", pcsc_stringify_error(rv));
SCardReleaseContext(ctx);
return -1;
}
if (readersLen <= 1) {
fprintf(stderr, "No smartcard readers found via PC/SC.\n");
SCardReleaseContext(ctx);
return -1;
}
// readers is a multi-string: sequence of null-terminated strings
// terminated by an extra null. Prefer a reader whose name contains
// "IC Reader", otherwise use the first.
const char *chosen = NULL;
const char *p = readers;
while (*p != '\0') {
if (!chosen) {
chosen = p;
}
if (strstr(p, "IC Reader") != NULL) {
chosen = p;
break;
}
p += strlen(p) + 1;
}
if (!chosen) {
fprintf(stderr, "Unable to choose a reader from PC/SC list.\n");
SCardReleaseContext(ctx);
return -1;
}
printf("Using reader: %s\n", chosen);
SCARDHANDLE card;
DWORD activeProt;
rv = SCardConnect(ctx, chosen, SCARD_SHARE_SHARED,
SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1,
&card, &activeProt);
if (rv != SCARD_S_SUCCESS) {
fprintf(stderr, "SCardConnect failed: %s\n", pcsc_stringify_error(rv));
SCardReleaseContext(ctx);
return -1;
}
// At this point the reader has powered/reset the card and read the ATR.
BYTE atr[64];
DWORD atrLen = sizeof(atr);
DWORD state, prot;
rv = SCardStatus(card, NULL, NULL, &state, &prot, atr, &atrLen);
if (rv == SCARD_S_SUCCESS) {
printf("ATR (%u bytes): ", atrLen);
for (DWORD i = 0; i < atrLen; i++) {
printf("%02X ", atr[i]);
}
printf("\n");
} else {
fprintf(stderr, "SCardStatus failed: %s\n", pcsc_stringify_error(rv));
}
SCardDisconnect(card, SCARD_LEAVE_CARD);
SCardReleaseContext(ctx);
return 0;
}
static void usage(const char *prog)
{
fprintf(stderr, "Usage: %s on|off|scan\n", prog);
fprintf(stderr, " off : unbind the IC Reader so the system cannot use it.\n");
fprintf(stderr, " on : bind the IC Reader back so it works again.\n");
fprintf(stderr, " scan: perform a one-shot PC/SC card scan using the reader.\n");
fprintf(stderr, "Note: on/off require root (write access to /sys/bus/usb/drivers/usb).\n");
}
int main(int argc, char **argv)
{
if (argc != 2) {
usage(argv[0]);
return EXIT_FAILURE;
}
char dev_name[64];
if (find_usb_device_name(dev_name, sizeof(dev_name)) != 0) {
return EXIT_FAILURE;
}
int rc;
if (strcmp(argv[1], "off") == 0) {
rc = disable_reader(dev_name);
} else if (strcmp(argv[1], "on") == 0) {
rc = enable_reader(dev_name);
} else if (strcmp(argv[1], "scan") == 0) {
rc = trigger_scan();
} else {
usage(argv[0]);
return EXIT_FAILURE;
}
if (rc != 0) {
fprintf(stderr, "Operation failed. Are you running as root?\n");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}

194
scan2.c
View File

@@ -1,194 +0,0 @@
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/input.h>
#include <sys/ioctl.h>
#include <openssl/sha.h>
#include <time.h>
#include <pthread.h>
#include <ctype.h>
// Interval in seconds between reminders (default 20 minutes),
// can be overridden with -i (supports optional s/m suffix).
static unsigned long long interval_seconds = 20ULL * 60ULL;
// Shared timestamp of when the "standing" event last occurred.
static unsigned long long last_time_standing = 0;
// Map a subset of key codes (digits and Enter) to characters.
static char keycode_to_char(unsigned short code)
{
switch (code) {
case KEY_0: return '0';
case KEY_1: return '1';
case KEY_2: return '2';
case KEY_3: return '3';
case KEY_4: return '4';
case KEY_5: return '5';
case KEY_6: return '6';
case KEY_7: return '7';
case KEY_8: return '8';
case KEY_9: return '9';
default: return '\0';
}
}
// Thread that once per second prints how long it has been since
// last_time_standing was updated.
static void *time_watcher_thread(void *arg)
{
(void)arg;
for (;;) {
sleep(1);
unsigned long long now = (unsigned long long)time(NULL);
if (last_time_standing != 0) {
unsigned long long delta = now - last_time_standing;
printf("Seconds since last_time_standing: %llu (interval=%llus)\n",
delta, interval_seconds);
fflush(stdout);
// If we've exceeded the configured interval, lock the screen
if (delta >= interval_seconds) {
// Use xinput to disable all keyboard-like devices until user stands again.
// This pipeline lists input devices, filters keyboards (excluding XTEST),
// extracts their IDs, and disables each one.
system("xinput --list --short | "
"grep -i 'keyboard' | grep -v 'XTEST' | "
"sed -E 's/.*id=([0-9]+).*/\\1/' | "
"xargs -r -n1 xinput disable");
system("i3lock -n -i /usr/local/share/lockscreens/standing_gopher.png");
}
}
}
return NULL;
}
int main(int argc, char **argv) {
// Replace with the specific event node for your keyboard
// Use 'lsusb' and 'cat /proc/bus/input/devices' to find the right one
const char *dev = "/dev/input/by-id/usb-IC_Reader_IC_Reader_08FF20171101-event-kbd";
struct input_event ev;
int fd;
// Optional: -i <interval>[s|m] to override interval_seconds
int opt;
while ((opt = getopt(argc, argv, "i:")) != -1) {
switch (opt) {
case 'i': {
char *end = NULL;
unsigned long long v = strtoull(optarg, &end, 10);
if (!optarg[0] || end == optarg || v == 0) {
fprintf(stderr, "Invalid interval '%s' for -i (must start with positive integer)\n", optarg);
return EXIT_FAILURE;
}
char unit = 'm'; // default unit: minutes
if (*end != '\0') {
// Allow a single unit character 's' or 'm'
if (end[1] != '\0') {
fprintf(stderr, "Invalid interval suffix in '%s' (use optional 's' or 'm')\n", optarg);
return EXIT_FAILURE;
}
unit = (char)tolower((unsigned char)*end);
if (unit != 's' && unit != 'm') {
fprintf(stderr, "Unknown interval unit '%c' in '%s' (use 's' or 'm')\n", *end, optarg);
return EXIT_FAILURE;
}
}
if (unit == 's') {
interval_seconds = v;
} else { // 'm'
interval_seconds = v * 60ULL;
}
break;
}
default:
fprintf(stderr, "Usage: %s [-i interval{s|m}]\n", argv[0]);
return EXIT_FAILURE;
}
}
fd = open(dev, O_RDONLY);
if (fd == -1) {
perror("Cannot open device");
return EXIT_FAILURE;
}
// Grab the device: This blocks all other apps from seeing these keystrokes
if (ioctl(fd, EVIOCGRAB, 1) == -1) {
perror("Could not grab device");
close(fd);
return EXIT_FAILURE;
}
printf("Input blocked from %s. Press Ctrl+C in this terminal to stop.\n", dev);
// Buffer to accumulate the characters the reader "types"
char buf_str[128];
size_t buf_len = 0;
// Initialize last_time_standing and start the watcher thread
last_time_standing = (unsigned long long)time(NULL);
pthread_t watcher;
if (pthread_create(&watcher, NULL, time_watcher_thread, NULL) != 0) {
perror("Failed to create watcher thread");
ioctl(fd, EVIOCGRAB, 0);
close(fd);
return EXIT_FAILURE;
}
pthread_detach(watcher);
// Continuous loop to capture events
while (1) {
ssize_t n = read(fd, &ev, sizeof(ev));
if (n == (ssize_t)-1) {
perror("Read error");
break;
} else if (n != sizeof(ev)) {
continue;
}
// Process only key events (type 1)
if (ev.type == EV_KEY) {
if (ev.value == 1) { // key press
if (ev.code == KEY_ENTER || ev.code == KEY_KPENTER) {
// End of the "typed" sequence: print the accumulated string
if (buf_len > 0) {
buf_str[buf_len] = '\0';
long long val = strtoll(buf_str, NULL, 10);
// Get the SHA-256 hash of the value
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256((unsigned char*)buf_str, buf_len, hash);
printf("SHA-256: ");
unsigned long long hash_val = 0;
for (int i = 0; i < 8; i++) {
hash_val = (hash_val << 8) | hash[i];
}
printf(" (as number: %llu)", hash_val);
printf("\n");
printf("Typed: %s (as number: %lld)\n", buf_str, val);
buf_len = 0;
if (hash_val == 4798061567229363866L) {
last_time_standing = (unsigned long long)time(NULL);
printf("Desk reminder timer reset at %llu seconds since epoch.\n", last_time_standing);
system("pkill i3lock");
system("xinput --list --short | "
"grep -i 'keyboard' | grep -v 'XTEST' | "
"sed -E 's/.*id=([0-9]+).*/\\1/' | "
"xargs -r -n1 xinput enable");
}
}
} else {
char c = keycode_to_char(ev.code);
if (c != '\0' && buf_len + 1 < sizeof(buf_str))
buf_str[buf_len++] = c;
}
}
}
}
// Release the grab before exiting
ioctl(fd, EVIOCGRAB, 0);
close(fd);
return 0;
}