1
1
/* -*- coding: utf-8 -*- */
3
3
* Passprompt - Read a password from the terminal and print it
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
36
37
#include <stddef.h> /* NULL, size_t, ssize_t */
37
38
#include <sys/types.h> /* ssize_t */
38
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getopt_long, getenv() */
40
41
#include <stdio.h> /* fprintf(), stderr, getline(),
41
42
stdin, feof(), perror(), fputc(),
42
43
stdout, getopt_long */
53
54
volatile bool quit_now = false;
54
55
bool debug = false;
55
const char *argp_program_version = "passprompt 1.0";
56
const char *argp_program_version = "password-prompt " VERSION;
56
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
58
59
static void termination_handler(__attribute__((unused))int signum){
73
74
struct argp_option options[] = {
74
75
{ .name = "prefix", .key = 'p',
75
76
.arg = "PREFIX", .flags = 0,
76
.doc = "Prefix used before the passprompt", .group = 2 },
77
.doc = "Prefix shown before the prompt", .group = 2 },
77
78
{ .name = "debug", .key = 128,
78
79
.doc = "Debug mode", .group = 3 },
103
104
struct argp argp = { .options = options, .parser = parse_opt,
105
.doc = "Mandos Passprompt -- Provides a passprompt" };
106
.doc = "Mandos password-prompt -- Read and"
107
" output a password" };
106
108
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
107
109
if (ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unkown error while parsing arguments\n");
110
fprintf(stderr, "Unknown error while parsing arguments\n");
109
111
return EXIT_FAILURE;
186
fprintf(stderr, "Interrupted by signal, exiting.\n");
182
188
status = EXIT_FAILURE;
187
fprintf(stderr, "%s Password: ", prefix);
189
fprintf(stderr, "Password: ");
193
fprintf(stderr, "%s ", prefix);
196
const char *cryptsource = getenv("cryptsource");
197
const char *crypttarget = getenv("crypttarget");
198
const char *const prompt
199
= "Enter passphrase to unlock the disk";
200
if(cryptsource == NULL){
201
if(crypttarget == NULL){
202
fprintf(stderr, "%s: ", prompt);
204
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
207
if(crypttarget == NULL){
208
fprintf(stderr, "%s %s: ", prompt, cryptsource);
210
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
191
215
ret = getline(&buffer, &n, stdin);
193
fprintf(stdout, "%s", buffer);
194
217
status = EXIT_SUCCESS;
218
/* Make n = data size instead of allocated buffer size */
220
/* Strip final newline */
221
if(n>0 and buffer[n-1] == '\n'){
222
buffer[n-1] = '\0'; /* not strictly necessary */
227
ret = write(STDOUT_FILENO, buffer + written, n - written);
230
status = EXIT_FAILURE;
233
written += (size_t)ret;
204
244
/* if(ret == 0), then the only sensible thing to do is to retry to
205
245
read from stdin */
206
246
fputc('\n', stderr);
247
if(debug and not quit_now){
248
/* If quit_now is true, we were interrupted by a signal, and
249
will print that later, so no need to show this too. */
250
fprintf(stderr, "getline() returned 0, retrying.\n");
210
257
fprintf(stderr, "Restoring terminal attributes\n");
217
fprintf(stderr, "%s is exiting\n", argv[0]);
264
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
267
if(status == EXIT_SUCCESS){