/mandos/release

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bzr branch http://bzr.recompile.se/loggerhead/mandos/release
13 by Björn Påhlsson
Added following support:
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#define _GNU_SOURCE		/* getline() */
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#define _FORTIFY_SOURCE 2
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#include <termios.h> 		/* struct termios, tcsetattr(),
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				   TCSAFLUSH, tcgetattr(), ECHO */
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#include <unistd.h>		/* struct termios, tcsetattr(),
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				   STDIN_FILENO, TCSAFLUSH,
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				   tcgetattr(), ECHO */
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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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#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 <stdio.h>		/* fprintf(), stderr, getline(),
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				   stdin, feof(), perror(), fputc(),
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				   stdout */
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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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volatile bool quit_now = false;
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void termination_handler(int signum){
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  quit_now = true;
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}
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int main(int argc, char **argv){
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  ssize_t ret = -1;
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  size_t n;
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  struct termios t_new, t_old;
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  char *buffer = NULL;
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  int status = EXIT_SUCCESS;
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  struct sigaction old_action,
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    new_action = { .sa_handler = termination_handler,
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		   .sa_flags = 0 };
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  if (tcgetattr(STDIN_FILENO, &t_old) != 0){
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    return EXIT_FAILURE;
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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, SIGQUIT);
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  sigaddset(&new_action.sa_mask, SIGHUP);
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  sigaddset(&new_action.sa_mask, SIGTERM);
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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(SIGQUIT, NULL, &old_action);
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  if (old_action.sa_handler != SIG_IGN)
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    sigaction(SIGQUIT, &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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  t_new = t_old;
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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 EXIT_FAILURE;
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  }
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  while(true){
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    if (quit_now){
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      status = EXIT_FAILURE;
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      break;
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    }
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    fprintf(stderr, "Password: ");
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    ret = getline(&buffer, &n, stdin);
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    if (ret > 0){
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      fprintf(stdout, "%s", buffer);
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      status = EXIT_SUCCESS;
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      break;
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    }
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    // ret == 0 makes no other sence than to retry to read from stdin
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    if (ret < 0){
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      if (errno != EINTR and not feof(stdin)){
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	perror("getline");
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	status = EXIT_FAILURE;
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	break;
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      }
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    }
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    fputc('\n', stderr);
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  }
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  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
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    perror("tcsetattr+echo");
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  }
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  return status;
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}