#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>

#define MODEM_DEVICE "/dev/ttyUSB0"

void sendATCommand(int serial_port, const char* command, char* response, int response_size) {
    write(serial_port, command, strlen(command));
    usleep(100000);
    int num_bytes = read(serial_port, response, response_size - 1);
    response[num_bytes] = '\0';
}

int main() {
    int serial_port = open(MODEM_DEVICE, O_RDWR);
    if (serial_port < 0) {
        perror("[-] Failed to open modem");
        return 1;
    }

    struct termios tty;
    tcgetattr(serial_port, &tty);
    cfsetispeed(&tty, B115200);
    cfsetospeed(&tty, B115200);
    tty.c_cflag |= (CLOCAL | CREAD);
    tcsetattr(serial_port, TCSANOW, &tty);

    char response[256];

    sendATCommand(serial_port, "AT+CCID\r\n", response, sizeof(response));
    printf("[+] SIM ICCID: %s\n", response);

    sendATCommand(serial_port, "AT+CIMI\r\n", response, sizeof(response));
    printf("[+] IMSI: %s\n", response);

    close(serial_port);
    return 0;
}