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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "ask-password-agent.h"
#include "exec-util.h"
#include "log.h"
#include "process-util.h"
#include "terminal-util.h"
static pid_t agent_pid = 0;
int ask_password_agent_open(void) {
int r;
if (agent_pid > 0)
return 0;
/* We check STDIN here, not STDOUT, since this is about input, not output */
if (!isatty_safe(STDIN_FILENO))
return 0;
/* Also check if we have a controlling terminal. If not (ENXIO here), we aren't actually invoked
* interactively on a terminal, hence fail */
r = get_ctty_devnr(0, NULL);
if (r == -ENXIO)
return 0;
if (r < 0)
return r;
if (!is_main_thread())
return -EPERM;
r = fork_agent("(sd-askpwagent)",
NULL, 0,
&agent_pid,
SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH,
SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH,
"--watch");
if (r < 0)
return log_error_errno(r, "Failed to fork TTY ask password agent: %m");
return 1;
}
void ask_password_agent_close(void) {
if (agent_pid <= 0)
return;
/* Inform agent that we are done */
sigterm_wait(TAKE_PID(agent_pid));
}
int ask_password_agent_open_if_enabled(BusTransport transport, bool ask_password) {
/* Open the ask password agent as a child process if necessary */
if (transport != BUS_TRANSPORT_LOCAL)
return 0;
if (!ask_password)
return 0;
return ask_password_agent_open();
}
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