int _open_serial_connection(char *name, char *baudrate_arg)
{
unsigned baudrate = 0;
if (_parse_baudrate(baudrate_arg, &baudrate) == -1) {
fprintf(stderr, "Invalid baudrate specified: %s\n", baudrate_arg);
return 1;
}
int serial_fd = open(name, O_RDWR | O_NOCTTY | O_SYNC);
if (serial_fd < 0) {
fprintf(stderr, "Error opening serial device %s\n", name);
return -1;
}
set_serial_attribs(serial_fd, baudrate, 0);
set_blocking(serial_fd, 1);
return serial_fd;
}
int main(int argc, char *argv[])
{
char inbuf[MTU];
unsigned baudrate = BAUDRATE_DEFAULT;
serial_t serial = {0};
if (argc < 3) {
usage();
return 1;
}
if (argc >= 4 && _parse_baudrate(argv[3], &baudrate) == -1) {
fprintf(stderr, "Invalid baudrate specified: %s\n", argv[3]);
return 1;
}
char ifname[IFNAMSIZ];
strncpy(ifname, argv[1], IFNAMSIZ);
int tap_fd = tun_alloc(ifname, IFF_TAP | IFF_NO_PI);
if (tap_fd < 0) {
return 1;
}
int serial_fd = open(argv[2], O_RDWR | O_NOCTTY | O_SYNC);
if (serial_fd < 0) {
fprintf(stderr, "Error opening serial device %s\n", argv[2]);
return 1;
}
set_serial_attribs(serial_fd, baudrate, 0);
set_blocking(serial_fd, 1);
fd_set readfds;
int max_fd = (serial_fd > tap_fd) ? serial_fd : tap_fd;
fprintf(stderr, "----> ethos: sending hello.\n");
_send_hello(serial_fd, &serial, LINE_FRAME_TYPE_HELLO);
fprintf(stderr, "----> ethos: activating serial pass through.\n");
_send_hello(serial_fd, &serial, LINE_FRAME_TYPE_HELLO);
while(1) {
int activity;
FD_ZERO(&readfds);
FD_SET(STDIN_FILENO, &readfds);
FD_SET(tap_fd, &readfds);
FD_SET(serial_fd, &readfds);
activity = select( max_fd + 1 , &readfds , NULL , NULL , NULL);
if ((activity < 0) && (errno != EINTR))
{
perror("select error");
}
if (FD_ISSET(serial_fd, &readfds)) {
ssize_t n = read(serial_fd, inbuf, sizeof(inbuf));
if (n > 0) {
char *ptr = inbuf;
while (n--) {
size_t res = _serial_handle_byte(&serial, *ptr++);
if (res) {
switch (serial.frametype) {
case LINE_FRAME_TYPE_DATA:
checked_write(tap_fd, serial.frame, serial.framebytes);
break;
case LINE_FRAME_TYPE_TEXT:
checked_write(STDOUT_FILENO, serial.frame, serial.framebytes);
break;
case LINE_FRAME_TYPE_HELLO:
case LINE_FRAME_TYPE_HELLO_REPLY:
if (serial.framebytes == 6) {
memcpy(serial.remote_l2_addr, serial.frame, 6);
if (serial.frametype == LINE_FRAME_TYPE_HELLO) {
fprintf(stderr, "----> ethos: hello received\n");
_send_hello(serial_fd, &serial, LINE_FRAME_TYPE_HELLO_REPLY);
} else {
fprintf(stderr, "----> ethos: hello reply received\n");
}
_clear_neighbor_cache(ifname);
}
break;
}
memset(&serial, '\0', sizeof(serial));
}
}
}
else {
fprintf(stderr, "lost serial connection.\n");
exit(1);
}
}
if (FD_ISSET(tap_fd, &readfds)) {
ssize_t res = read(tap_fd, inbuf, sizeof(inbuf));
if (res <= 0) {
fprintf(stderr, "error reading from tap device. res=%zi\n", res);
continue;
}
char delim = LINE_FRAME_DELIMITER;
checked_write(serial_fd, &delim, 1);
_write_escaped(serial_fd, inbuf, res);
checked_write(serial_fd, &delim, 1);
}
if (FD_ISSET(STDIN_FILENO, &readfds)) {
ssize_t res = read(STDIN_FILENO, inbuf, sizeof(inbuf));
if (res <= 0) {
fprintf(stderr, "error reading from stdio. res=%zi\n", res);
continue;
}
if (res) {
char delim = LINE_FRAME_DELIMITER;
char head[] = { LINE_FRAME_DELIMITER, LINE_ESC_CHAR, (LINE_FRAME_TYPE_TEXT ^ 0x20) };
checked_write(serial_fd, head, sizeof(head));
_write_escaped(serial_fd, inbuf, res);
checked_write(serial_fd, &delim, 1);
}
}
}
return 0;
}
