int pty_forward_set_ignore_vhangup(PTYForward *f, bool b) {
int r;
assert(f);
if (!!(f->flags & PTY_FORWARD_IGNORE_VHANGUP) == b)
return 0;
if (b)
f->flags |= PTY_FORWARD_IGNORE_VHANGUP;
else
f->flags &= ~PTY_FORWARD_IGNORE_VHANGUP;
if (!ignore_vhangup(f)) {
/* We shall now react to vhangup()s? Let's check
* immediately if we might be in one */
f->master_readable = true;
r = shovel(f);
if (r < 0)
return r;
}
return 0;
}
/* Child process that finds out what to connect to and proxies
*/
void start_shoveler(int in_socket)
{
fd_set fds;
struct timeval tv;
int res = PROBE_AGAIN;
int out_socket;
struct connection cnx;
init_cnx(&cnx);
cnx.q[0].fd = in_socket;
FD_ZERO(&fds);
FD_SET(in_socket, &fds);
memset(&tv, 0, sizeof(tv));
tv.tv_sec = probing_timeout;
while (res == PROBE_AGAIN) {
/* POSIX does not guarantee that tv will be updated, but the client can
* only postpone the inevitable for so long */
res = select(in_socket + 1, &fds, NULL, NULL, &tv);
if (res == -1)
perror("select");
if (FD_ISSET(in_socket, &fds)) {
/* Received data: figure out what protocol it is */
res = probe_client_protocol(&cnx);
} else {
/* Timed out: it's necessarily SSH */
cnx.proto = timeout_protocol();
break;
}
}
if (cnx.proto->service &&
check_access_rights(in_socket, cnx.proto->service)) {
exit(0);
}
/* Connect the target socket */
out_socket = connect_addr(&cnx, in_socket);
CHECK_RES_DIE(out_socket, "connect");
cnx.q[1].fd = out_socket;
log_connection(&cnx);
flush_deferred(&cnx.q[1]);
shovel(&cnx);
close(in_socket);
close(out_socket);
if (verbose)
fprintf(stderr, "connection closed down\n");
exit(0);
}
static int on_stdout_event(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
PTYForward *f = userdata;
assert(f);
assert(e);
assert(e == f->stdout_event_source);
assert(fd >= 0);
assert(fd == STDOUT_FILENO);
if (revents & (EPOLLOUT|EPOLLHUP))
f->stdout_writable = true;
return shovel(f);
}
static int on_master_event(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
PTYForward *f = userdata;
assert(f);
assert(e);
assert(e == f->master_event_source);
assert(fd >= 0);
assert(fd == f->master);
if (revents & (EPOLLIN|EPOLLHUP))
f->master_readable = true;
if (revents & (EPOLLOUT|EPOLLHUP))
f->master_writable = true;
return shovel(f);
}
int pty_forward_set_ignore_vhangup(PTYForward *f, bool ignore_vhangup) {
int r;
assert(f);
if (f->ignore_vhangup == ignore_vhangup)
return 0;
f->ignore_vhangup = ignore_vhangup;
if (!f->ignore_vhangup) {
/* We shall now react to vhangup()s? Let's check
* immediately if we might be in one */
f->master_readable = true;
r = shovel(f);
if (r < 0)
return r;
}
return 0;
}
