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* Password-prompt - Read a password from the terminal and print it
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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* Copyright © 2008-2010 Teddy Hogeborn
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* Copyright © 2008-2010 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
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#include <stdio.h> /* fprintf(), stderr, getline(),
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stdin, feof(), perror(), fputc()
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stdin, feof(), 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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#include <error.h> /* error() */
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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 <string.h> /* strlen, rindex */
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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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sigemptyset(&new_action.sa_mask);
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ret = sigaddset(&new_action.sa_mask, SIGINT);
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error(0, errno, "sigaddset");
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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error(0, errno, "sigaddset");
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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error(0, errno, "sigaddset");
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/* Need to check if the handler is SIG_IGN before handling:
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ret = sigaction(SIGINT, NULL, &old_action);
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error(0, errno, "sigaction");
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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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error(0, errno, "sigaction");
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ret = sigaction(SIGHUP, NULL, &old_action);
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error(0, errno, "sigaction");
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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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error(0, errno, "sigaction");
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ret = sigaction(SIGTERM, NULL, &old_action);
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error(0, errno, "sigaction");
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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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error(0, errno, "sigaction");
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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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perror("tcsetattr-echo");
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error(0, errno, "tcsetattr-echo");
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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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const char *cryptsource = getenv("CRYPTTAB_SOURCE");
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const char *crypttarget = getenv("CRYPTTAB_NAME");
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/* Before cryptsetup 1.1.0~rc2 */
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if(cryptsource == NULL){
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cryptsource = getenv("cryptsource");
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if(crypttarget == NULL){
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crypttarget = getenv("crypttarget");
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const char *const prompt1 = "Unlocking the disk";
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const char *const prompt2 = "Enter passphrase";
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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 to unlock the disk: ", prompt2);
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fprintf(stderr, "%s (%s): ", prompt, crypttarget);
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fprintf(stderr, "%s (%s)\n%s: ", prompt1, 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\n%s: ", prompt1, cryptsource,
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fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
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fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
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crypttarget, prompt2);
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ret = getline(&buffer, &n, stdin);
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sret = getline(&buffer, &n, stdin);
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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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size_t written = 0;
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while(written < n){
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ret = write(STDOUT_FILENO, buffer + written, n - written);
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sret = write(STDOUT_FILENO, buffer + written, n - written);
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error(0, errno, "write");
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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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error(0, errno, "tcsetattr+echo");
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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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error(0, errno, "sigaction");
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raise(signal_received);