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 & Björn Påhlsson
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
36
36
#include <stddef.h> /* NULL, size_t, ssize_t */
37
37
#include <sys/types.h> /* ssize_t */
38
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
39
getopt_long, getenv() */
40
40
#include <stdio.h> /* fprintf(), stderr, getline(),
41
41
stdin, feof(), perror(), fputc(),
42
42
stdout, getopt_long */
53
53
volatile bool quit_now = false;
54
54
bool debug = false;
55
const char *argp_program_version = "password-prompt 1.0";
55
const char *argp_program_version = "password-prompt " VERSION;
56
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
58
58
static void termination_handler(__attribute__((unused))int signum){
73
73
struct argp_option options[] = {
74
74
{ .name = "prefix", .key = 'p',
75
75
.arg = "PREFIX", .flags = 0,
76
.doc = "Prefix used before the passprompt", .group = 2 },
76
.doc = "Prefix shown before the prompt", .group = 2 },
77
77
{ .name = "debug", .key = 128,
78
78
.doc = "Debug mode", .group = 3 },
103
103
struct argp argp = { .options = options, .parser = parse_opt,
105
.doc = "Mandos Passprompt -- Provides a passprompt" };
105
.doc = "Mandos password-prompt -- Read and"
106
" output a password" };
106
107
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
107
108
if (ret == ARGP_ERR_UNKNOWN){
108
109
fprintf(stderr, "Unknown error while parsing arguments\n");
185
fprintf(stderr, "Interrupted by signal, exiting.\n");
182
187
status = EXIT_FAILURE;
187
fprintf(stderr, "%s Password: ", prefix);
189
fprintf(stderr, "Password: ");
192
fprintf(stderr, "%s ", prefix);
195
const char *cryptsource = getenv("cryptsource");
196
const char *crypttarget = getenv("crypttarget");
197
const char *const prompt
198
= "Enter passphrase to unlock the disk";
199
if(cryptsource == NULL){
200
if(crypttarget == NULL){
201
fprintf(stderr, "%s: ", prompt);
203
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
206
if(crypttarget == NULL){
207
fprintf(stderr, "%s %s: ", prompt, cryptsource);
209
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
191
214
ret = getline(&buffer, &n, stdin);
193
fprintf(stdout, "%s", buffer);
194
216
status = EXIT_SUCCESS;
217
/* Make n = data size instead of allocated buffer size */
219
/* Strip final newline */
220
if(n>0 and buffer[n-1] == '\n'){
221
buffer[n-1] = '\0'; /* not strictly necessary */
226
ret = write(STDOUT_FILENO, buffer + written, n - written);
229
status = EXIT_FAILURE;
232
written += (size_t)ret;
204
243
/* if(ret == 0), then the only sensible thing to do is to retry to
205
244
read from stdin */
206
245
fputc('\n', stderr);
246
if(debug and not quit_now){
247
/* If quit_now is true, we were interrupted by a signal, and
248
will print that later, so no need to show this too. */
249
fprintf(stderr, "getline() returned 0, retrying.\n");
210
256
fprintf(stderr, "Restoring terminal attributes\n");
217
fprintf(stderr, "%s is exiting\n", argv[0]);
263
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
266
if(status == EXIT_SUCCESS){