cryptsetup: hook up tool with ask-password

[thirdparty/systemd.git] / src / ask-password.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <sys/socket.h>
#include <sys/poll.h>
#include <sys/types.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/signalfd.h>
#include <getopt.h>
#include <termios.h>
#include <limits.h>
#include <stddef.h>

#include "log.h"
#include "macro.h"
#include "util.h"
#include "ask-password-api.h"

static const char *arg_icon = NULL;
static const char *arg_message = NULL;
static bool arg_use_tty = true;
static usec_t arg_timeout = 60 * USEC_PER_SEC;

static int help(void) {

        printf("%s [OPTIONS...] MESSAGE\n\n"
               "Query the user for a system passphrase, via the TTY or an UI agent.\n\n"
               "  -h --help         Show this help\n"
               "     --icon=NAME    Icon name\n"
               "     --timeout=SEC Timeout in sec\n"
               "     --no-tty       Ask question via agent even on TTY\n",
               program_invocation_short_name);

        return 0;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_ICON = 0x100,
                ARG_TIMEOUT,
                ARG_NO_TTY
        };

        static const struct option options[] = {
                { "help",      no_argument,       NULL, 'h'         },
                { "icon",      required_argument, NULL, ARG_ICON    },
                { "timeout",   required_argument, NULL, ARG_TIMEOUT },
                { "no-tty",    no_argument,       NULL, ARG_NO_TTY  },
                { NULL,        0,                 NULL, 0           }
        };

        int c;

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {

                switch (c) {

                case 'h':
                        help();
                        return 0;

                case ARG_ICON:
                        arg_icon = optarg;
                        break;

                case ARG_TIMEOUT:
                        if (parse_usec(optarg, &arg_timeout) < 0 || arg_timeout <= 0) {
                                log_error("Failed to parse --timeout parameter %s", optarg);
                                return -EINVAL;
                        }
                        break;

                case ARG_NO_TTY:
                        arg_use_tty = false;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        log_error("Unknown option code %c", c);
                        return -EINVAL;
                }
        }

        if (optind != argc-1) {
                help();
                return -EINVAL;
        }

        arg_message = argv[optind];
        return 1;
}

int main(int argc, char *argv[]) {
        int r;
        char *password = NULL;

        log_parse_environment();
        log_open();

        if ((r = parse_argv(argc, argv)) <= 0)
                goto finish;

        if (arg_use_tty && isatty(STDIN_FILENO))
                r = ask_password_tty(arg_message, now(CLOCK_MONOTONIC) + arg_timeout, NULL, &password);
        else
                r = ask_password_agent(arg_message, arg_icon, now(CLOCK_MONOTONIC) + arg_timeout, &password);

        if (r >= 0) {
                fputs(password, stdout);
                fflush(stdout);
        }

finish:
        free(password);

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}