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#include <signal.h> /* sig_atomic_t, raise(), struct
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sigaction, sigemptyset(),
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sigaction(), sigaddset(), SIGINT,
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SIGQUIT, SIGHUP, SIGTERM,
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SIGQUIT, SIGHUP, SIGTERM */
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#include <stddef.h> /* NULL, size_t, ssize_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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getopt_long, getenv() */
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#include <stdio.h> /* fprintf(), stderr, getline(),
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stdin, feof(), perror(), fputc(),
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#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
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EFAULT, EFBIG, EIO, ENOSPC, EINTR
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stdout, getopt_long */
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#include <errno.h> /* errno, EINVAL */
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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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struct argp argp = { .options = options, .parser = parse_opt,
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.doc = "Mandos password-prompt -- Read and"
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" output a password" };
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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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.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, "Unknown error while parsing arguments\n");
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fprintf(stderr, "Starting %s\n", argv[0]);
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fprintf(stderr, "Storing current terminal attributes\n");
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if(tcgetattr(STDIN_FILENO, &t_old) != 0){
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return EX_UNAVAILABLE;
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if (tcgetattr(STDIN_FILENO, &t_old) != 0){
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sigemptyset(&new_action.sa_mask);
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ret = sigaddset(&new_action.sa_mask, SIGINT);
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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/* Need to check if the handler is SIG_IGN before handling:
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| [[info:libc:Initial Signal Actions]] |
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| [[info:libc:Basic Signal Handling]] |
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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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perror("sigaction");
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if(old_action.sa_handler != SIG_IGN){
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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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perror("sigaction");
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ret = sigaction(SIGHUP, NULL, &old_action);
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perror("sigaction");
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if(old_action.sa_handler != SIG_IGN){
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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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perror("sigaction");
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ret = sigaction(SIGTERM, NULL, &old_action);
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perror("sigaction");
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if(old_action.sa_handler != SIG_IGN){
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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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perror("sigaction");
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fprintf(stderr, "Removing echo flag from terminal attributes\n");
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t_new.c_lflag &= ~(tcflag_t)ECHO;
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if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
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t_new.c_lflag &= ~ECHO;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
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perror("tcsetattr-echo");
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return EX_UNAVAILABLE;
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fprintf(stderr, "Waiting for input from stdin \n");
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fprintf(stderr, "Interrupted by signal, exiting.\n");
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status = EXIT_FAILURE;
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fprintf(stderr, "%s ", prefix);
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const char *cryptsource = getenv("cryptsource");
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const char *crypttarget = getenv("crypttarget");
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const char *const prompt
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= "Enter passphrase to unlock the disk";
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if(cryptsource == NULL){
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if(crypttarget == NULL){
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fprintf(stderr, "%s: ", prompt);
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fprintf(stderr, "%s (%s): ", prompt, crypttarget);
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if(crypttarget == NULL){
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fprintf(stderr, "%s %s: ", prompt, cryptsource);
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fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
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fprintf(stderr, "%s Password: ", prefix);
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fprintf(stderr, "Password: ");
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ret = getline(&buffer, &n, stdin);
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fprintf(stdout, "%s", buffer);
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status = EXIT_SUCCESS;
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/* Make n = data size instead of allocated buffer size */
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/* Strip final newline */
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if(n > 0 and buffer[n-1] == '\n'){
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buffer[n-1] = '\0'; /* not strictly necessary */
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ret = write(STDOUT_FILENO, buffer + written, n - written);
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status = EXIT_FAILURE;
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written += (size_t)ret;
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ret = close(STDOUT_FILENO);
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if(errno != EINTR and not feof(stdin)){
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if (errno != EINTR and not feof(stdin)){
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perror("getline");
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status = EX_UNAVAILABLE;
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status = EXIT_FAILURE;
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/* if(ret == 0), then the only sensible thing to do is to retry to
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read from stdin */
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fputc('\n', stderr);
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if(debug and not quit_now){
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/* If quit_now is nonzero, we were interrupted by a signal, and
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will print that later, so no need to show this too. */
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fprintf(stderr, "getline() returned 0, retrying.\n");
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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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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
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perror("tcsetattr+echo");
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sigemptyset(&old_action.sa_mask);
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old_action.sa_handler = SIG_DFL;
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ret = sigaction(signal_received, &old_action, NULL);
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raise(signal_received);
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fprintf(stderr, "%s is exiting with status %d\n", argv[0],
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if(status == EXIT_SUCCESS or status == EX_OK){
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fprintf(stderr, "%s is exiting\n", argv[0]);