radare2/libr/socket/serial.c

/* radare - LGPL - Copyright 2017 - pancake */

#include <r_socket.h>
#if __UNIX__ && !defined(__MINGW32__)

#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <termios.h>

static int set_interface_attribs (int fd, int speed, int parity) {
        struct termios tty;
        memset (&tty, 0, sizeof tty);
        if (tcgetattr (fd, &tty) != 0) {
                return -1;
        }
        cfsetospeed (&tty, speed);
        cfsetispeed (&tty, speed);

        tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8;     // 8-bit chars
        // disable IGNBRK for mismatched speed tests; otherwise receive break
        // as \000 chars
        tty.c_iflag &= ~IGNBRK;         // disable break processing
        tty.c_lflag = 0;                // no signaling chars, no echo,
        // no canonical processing
        tty.c_oflag = 0;                // no remapping, no delays
        tty.c_cc[VMIN]  = 0;            // read doesn't block
        tty.c_cc[VTIME] = 5;            // 0.5 seconds read timeout

        tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl

        tty.c_cflag |= (CLOCAL | CREAD);// ignore modem controls,
        // enable reading
        tty.c_cflag &= ~(PARENB | PARODD);      // shut off parity
        tty.c_cflag |= parity;
        tty.c_cflag &= ~CSTOPB;
        tty.c_cflag &= ~CRTSCTS;

        if (tcsetattr (fd, TCSANOW, &tty) != 0) {
                return -1;
        }
        return 0;
}

R_API int r_socket_connect_serial(RSocket *sock, const char *path, int speed, int parity) {
	int fd = open (path, O_RDWR | O_SYNC | O_BINARY, 0); // O_NOCTY
	if (fd == -1) {
		return -1;
	}
	if (speed < 1) {
		speed = 9600; // 19200
	}
	(void)set_interface_attribs (fd, speed, parity);
	sock->fd = fd;
	return fd;
}

#else // __UNIX__

R_API int r_socket_connect_serial(RSocket *sock, const char *path, int speed, int parity) {
	return -1;
}
#endif