src/shared/spawn-ask-password-agent.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2011 Lennart Poettering
   4 ***/
   5
   6 #include <signal.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 #include "log.h"
  11 #include "process-util.h"
  12 #include "spawn-ask-password-agent.h"
  13 #include "util.h"
  14
  15 static pid_t agent_pid = 0;
  16
  17 int ask_password_agent_open(void) {
  18         int r;
  19
  20         if (agent_pid > 0)
  21                 return 0;
  22
  23         /* We check STDIN here, not STDOUT, since this is about input,
  24          * not output */
  25         if (!isatty(STDIN_FILENO))
  26                 return 0;
  27
  28         if (!is_main_thread())
  29                 return -EPERM;
  30
  31         r = fork_agent("(sd-askpwagent)",
  32                        NULL, 0,
  33                        &agent_pid,
  34                        SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH,
  35                        SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, "--watch", NULL);
  36         if (r < 0)
  37                 return log_error_errno(r, "Failed to fork TTY ask password agent: %m");
  38
  39         return 1;
  40 }
  41
  42 void ask_password_agent_close(void) {
  43
  44         if (agent_pid <= 0)
  45                 return;
  46
  47         /* Inform agent that we are done */
  48         (void) kill_and_sigcont(agent_pid, SIGTERM);
  49         (void) wait_for_terminate(agent_pid, NULL);
  50         agent_pid = 0;
  51 }