1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
3
* Passprompt - Read a password from the terminal and print it
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
25
25
#define _GNU_SOURCE /* getline() */
32
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
33
sigaction, sigemptyset(),
34
34
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
35
SIGQUIT, SIGHUP, SIGTERM */
37
36
#include <stddef.h> /* NULL, size_t, ssize_t */
38
37
#include <sys/types.h> /* ssize_t */
39
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
51
50
ARGP_KEY_ARG, ARGP_KEY_END,
52
51
ARGP_ERR_UNKNOWN */
54
volatile sig_atomic_t quit_now = 0;
53
volatile bool quit_now = false;
56
54
bool debug = false;
57
55
const char *argp_program_version = "password-prompt " VERSION;
58
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
60
static void termination_handler(int signum){
65
signal_received = signum;
58
static void termination_handler(__attribute__((unused))int signum){
68
62
int main(int argc, char **argv){
84
78
.doc = "Debug mode", .group = 3 },
88
error_t parse_opt (int key, char *arg, struct argp_state *state){
82
error_t parse_opt (int key, char *arg, struct argp_state *state) {
83
/* Get the INPUT argument from `argp_parse', which we know is a
84
pointer to our plugin list pointer. */
107
103
struct argp argp = { .options = options, .parser = parse_opt,
109
105
.doc = "Mandos password-prompt -- Read and"
110
106
" output a password" };
111
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
112
if(ret == ARGP_ERR_UNKNOWN){
107
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
108
if (ret == ARGP_ERR_UNKNOWN){
113
109
fprintf(stderr, "Unknown error while parsing arguments\n");
114
110
return EXIT_FAILURE;
119
115
fprintf(stderr, "Starting %s\n", argv[0]);
122
118
fprintf(stderr, "Storing current terminal attributes\n");
125
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
126
122
perror("tcgetattr");
127
123
return EXIT_FAILURE;
130
126
sigemptyset(&new_action.sa_mask);
131
ret = sigaddset(&new_action.sa_mask, SIGINT);
136
ret = sigaddset(&new_action.sa_mask, SIGHUP);
141
ret = sigaddset(&new_action.sa_mask, SIGTERM);
146
/* Need to check if the handler is SIG_IGN before handling:
147
| [[info:libc:Initial Signal Actions]] |
148
| [[info:libc:Basic Signal Handling]] |
127
sigaddset(&new_action.sa_mask, SIGINT);
128
sigaddset(&new_action.sa_mask, SIGHUP);
129
sigaddset(&new_action.sa_mask, SIGTERM);
150
130
ret = sigaction(SIGINT, NULL, &old_action);
152
132
perror("sigaction");
153
133
return EXIT_FAILURE;
155
if(old_action.sa_handler != SIG_IGN){
135
if (old_action.sa_handler != SIG_IGN){
156
136
ret = sigaction(SIGINT, &new_action, NULL);
158
138
perror("sigaction");
189
169
fprintf(stderr, "Removing echo flag from terminal attributes\n");
193
t_new.c_lflag &= ~(tcflag_t)ECHO;
194
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
195
175
perror("tcsetattr-echo");
196
176
return EXIT_FAILURE;
200
180
fprintf(stderr, "Waiting for input from stdin \n");
205
185
fprintf(stderr, "Interrupted by signal, exiting.\n");
264
244
read from stdin */
265
245
fputc('\n', stderr);
266
246
if(debug and not quit_now){
267
/* If quit_now is nonzero, we were interrupted by a signal, and
247
/* If quit_now is true, we were interrupted by a signal, and
268
248
will print that later, so no need to show this too. */
269
249
fprintf(stderr, "getline() returned 0, retrying.\n");
276
256
fprintf(stderr, "Restoring terminal attributes\n");
278
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
258
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
279
259
perror("tcsetattr+echo");
283
sigemptyset(&old_action.sa_mask);
284
old_action.sa_handler = SIG_DFL;
285
ret = sigaction(signal_received, &old_action, NULL);
289
raise(signal_received);
293
263
fprintf(stderr, "%s is exiting with status %d\n", argv[0],