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plugins.d/password-prompt.c
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/*  -*- coding: utf-8 -*- */
 
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/*  -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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/*
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 * Password-prompt - Read a password from the terminal and print it
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 * 
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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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                                   raise() */
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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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                                   ARGP_ERR_UNKNOWN */
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volatile sig_atomic_t quit_now = 0;
 
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int signal_received;
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bool debug = false;
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const char *argp_program_version = "password-prompt " VERSION;
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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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static void termination_handler(int signum){
 
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  if(quit_now){
 
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    return;
 
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  }
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  quit_now = 1;
 
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  signal_received = signum;
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}
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int main(int argc, char **argv){
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  }
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  sigemptyset(&new_action.sa_mask);
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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 = sigaddset(&new_action.sa_mask, SIGINT);
 
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  if(ret == -1){
 
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    perror("sigaddset");
 
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    return EXIT_FAILURE;
 
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  }
 
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  ret = sigaddset(&new_action.sa_mask, SIGHUP);
 
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  if(ret == -1){
 
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    perror("sigaddset");
 
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    return EXIT_FAILURE;
 
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  }
 
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  ret = sigaddset(&new_action.sa_mask, SIGTERM);
 
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  if(ret == -1){
 
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    perror("sigaddset");
 
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    return EXIT_FAILURE;
 
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  }
 
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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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  */
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  ret = sigaction(SIGINT, NULL, &old_action);
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  if(ret == -1){
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    perror("sigaction");
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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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        = "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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    /* 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 quit_now == 0){
 
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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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    perror("tcsetattr+echo");
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  }
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  if(quit_now){
 
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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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    if(ret == -1){
 
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      perror("sigaction");
 
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    }
 
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    raise(signal_received);
 
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  }
 
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  if(debug){
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    fprintf(stderr, "%s is exiting with status %d\n", argv[0],
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            status);