SnapKey-linux.cpp

SnapKey-linux.cpp

@@ -0,0 +1,142 @@
+// snapkey_evdev_cfg.cpp
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/input.h>
+#include <linux/uinput.h>
+#include <libevdev/libevdev.h>
+#include <iostream>
+#include <fstream>
+#include <map>
+#include <cstring>
+#include <cctype>
+
+std::map<std::string, int> keyMap = {
+    {"KEY_SYSRQ", KEY_SYSRQ}, {"KEY_LEFTALT", KEY_LEFTALT},
+    {"KEY_A", KEY_A}, {"KEY_B", KEY_B}, {"KEY_C", KEY_C},
+    {"KEY_LEFTCTRL", KEY_LEFTCTRL}, {"KEY_ESC", KEY_ESC},
+    {"KEY_ENTER", KEY_ENTER}, {"KEY_TAB", KEY_TAB},
+    // Add more keys as needed
+};
+
+int parseKey(const std::string& name) {
+    auto it = keyMap.find(name);
+    return (it != keyMap.end()) ? it->second : -1;
+}
+
+bool loadConfig(int &trigger, int &simulate) {
+    std::ifstream cfg("snapkey.cfg");
+    if (!cfg) {
+        std::cerr << "Config file 'snapkey.cfg' not found.\n";
+        return false;
+    }
+
+    std::string line;
+    while (std::getline(cfg, line)) {
+        size_t eq = line.find('=');
+        if (eq == std::string::npos) continue;
+
+        std::string key = line.substr(0, eq);
+        std::string value = line.substr(eq + 1);
+        if (key == "trigger") trigger = parseKey(value);
+        else if (key == "simulate") simulate = parseKey(value);
+    }
+
+    if (trigger < 0 || simulate < 0) {
+        std::cerr << "Invalid keys in config.\n";
+        return false;
+    }
+    return true;
+}
+
+int setup_uinput_device(int simulate_key_code) {
+    int ufd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
+    if (ufd < 0) {
+        perror("open /dev/uinput");
+        return -1;
+    }
+
+    ioctl(ufd, UI_SET_EVBIT, EV_KEY);
+    ioctl(ufd, UI_SET_KEYBIT, simulate_key_code);
+
+    struct uinput_user_dev uidev{};
+    snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "snapkey-uinput");
+    uidev.id.bustype = BUS_USB;
+    uidev.id.vendor  = 0x1234;
+    uidev.id.product = 0xfedc;
+    uidev.id.version = 1;
+
+    write(ufd, &uidev, sizeof(uidev));
+    ioctl(ufd, UI_DEV_CREATE);
+
+    return ufd;
+}
+
+void send_key(int ufd, int keycode) {
+    struct input_event ev{};
+    gettimeofday(&ev.time, NULL);
+
+    ev.type = EV_KEY;
+    ev.code = keycode;
+    ev.value = 1;
+    write(ufd, &ev, sizeof(ev));
+
+    ev.value = 0;
+    write(ufd, &ev, sizeof(ev));
+
+    ev.type = EV_SYN;
+    ev.code = SYN_REPORT;
+    ev.value = 0;
+    write(ufd, &ev, sizeof(ev));
+}
+
+int find_keyboard_event() {
+    for (int i = 0; i < 32; ++i) {
+        char path[64];
+        snprintf(path, sizeof(path), "/dev/input/event%d", i);
+        int fd = open(path, O_RDONLY | O_NONBLOCK);
+        if (fd < 0) continue;
+
+        struct libevdev* dev = nullptr;
+        if (libevdev_new_from_fd(fd, &dev) == 0) {
+            if (libevdev_has_event_type(dev, EV_KEY)) {
+                if (libevdev_has_event_code(dev, EV_KEY, KEY_A)) {
+                    std::cout << "Using input device: " << path << "\n";
+                    libevdev_free(dev);
+                    return fd;
+                }
+            }
+            libevdev_free(dev);
+        }
+        close(fd);
+    }
+
+    std::cerr << "No suitable keyboard device found.\n";
+    return -1;
+}
+
+int main() {
+    int trigger_key = -1, simulate_key = -1;
+    if (!loadConfig(trigger_key, simulate_key)) return 1;
+
+    int input_fd = find_keyboard_event();
+    if (input_fd < 0) return 1;
+
+    int uinput_fd = setup_uinput_device(simulate_key);
+    if (uinput_fd < 0) return 1;
+
+    struct input_event ev{};
+    while (true) {
+        ssize_t n = read(input_fd, &ev, sizeof(ev));
+        if (n <= 0) continue;
+
+        if (ev.type == EV_KEY && ev.code == trigger_key && ev.value == 1) {
+            std::cout << "Trigger key pressed. Simulating key.\n";
+            send_key(uinput_fd, simulate_key);
+        }
+    }
+
+    ioctl(uinput_fd, UI_DEV_DESTROY);
+    close(uinput_fd);
+    close(input_fd);
+    return 0;
+}