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sigaction, sigemptyset(),
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sigaction(), sigaddset(), SIGINT,
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SIGQUIT, SIGHUP, SIGTERM */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stddef.h> /* NULL, size_t */
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#include <sys/types.h> /* ssize_t */
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#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
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#include <iso646.h> /* or, not */
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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* strlen, rindex, strncmp, strcmp */
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#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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argp_parse(), error_t,
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ARGP_KEY_ARG, ARGP_KEY_END,
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#include <getopt.h> /* getopt_long */
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volatile bool quit_now = false;
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bool debug = false;
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const char *argp_program_version = "passprompt 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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static void termination_handler(__attribute__((unused))int signum){
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void termination_handler(__attribute__((unused))int signum){
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struct sigaction old_action,
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new_action = { .sa_handler = termination_handler,
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struct argp_option options[] = {
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{ .name = "prefix", .key = 'p',
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.arg = "PREFIX", .flags = 0,
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.doc = "Prefix used before the passprompt", .group = 2 },
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{ .name = "debug", .key = 128,
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.doc = "Debug mode", .group = 3 },
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error_t parse_opt (int key, char *arg, struct argp_state *state) {
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/* Get the INPUT argument from `argp_parse', which we know is a
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pointer to our plugin list pointer. */
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return ARGP_ERR_UNKNOWN;
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static struct option long_options[] = {
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{"debug", no_argument, (int *)&debug, 1},
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{"prefix", required_argument, 0, 'p'},
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ret = getopt_long (argc, argv, "p:", long_options, &option_index);
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struct argp argp = { .options = options, .parser = parse_opt,
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.doc = "Mandos Passprompt -- Provides a passprompt" };
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ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
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if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unkown error while parsing arguments\n");
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fprintf(stderr, "bad arguments\n");
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fprintf(stderr, "Starting %s\n", argv[0]);
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sigaddset(&new_action.sa_mask, SIGINT);
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sigaddset(&new_action.sa_mask, SIGHUP);
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sigaddset(&new_action.sa_mask, SIGTERM);
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ret = sigaction(SIGINT, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGINT, &new_action, NULL);
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ret = sigaction(SIGHUP, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGHUP, &new_action, NULL);
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ret = sigaction(SIGTERM, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGTERM, &new_action, NULL);
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sigaction(SIGINT, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN)
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sigaction(SIGINT, &new_action, NULL);
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sigaction(SIGHUP, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN)
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sigaction(SIGHUP, &new_action, NULL);
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sigaction(SIGTERM, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN)
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sigaction(SIGTERM, &new_action, NULL);
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fprintf(stderr, "Removing echo flag from terminal attributes\n");
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/* if(ret == 0), then the only sensible thing to do is to retry to
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fputc('\n', stderr);
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fprintf(stderr, "Restoring terminal attributes\n");
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
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perror("tcsetattr+echo");
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fprintf(stderr, "%s is exiting\n", argv[0]);