1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
3
* Passprompt - Read a password from the terminal and print it
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
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,
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,
39
40
getopt_long, getenv() */
40
41
#include <stdio.h> /* fprintf(), stderr, getline(),
41
42
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
44
47
#include <iso646.h> /* or, not */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* strlen, rindex, strncmp, strcmp */
49
52
argp_parse(), error_t,
50
53
ARGP_KEY_ARG, ARGP_KEY_END,
51
54
ARGP_ERR_UNKNOWN */
55
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
56
EX_UNAVAILABLE, EX_IOERR, EX_OK */
53
volatile bool quit_now = false;
58
volatile sig_atomic_t quit_now = 0;
54
60
bool debug = false;
55
const char *argp_program_version = "password-prompt 1.0";
61
const char *argp_program_version = "password-prompt " VERSION;
56
62
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
58
static void termination_handler(__attribute__((unused))int signum){
64
static void termination_handler(int signum){
69
signal_received = signum;
62
72
int main(int argc, char **argv){
103
111
struct argp argp = { .options = options, .parser = parse_opt,
105
113
.doc = "Mandos password-prompt -- Read and"
106
114
" output a password" };
107
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
108
if (ret == ARGP_ERR_UNKNOWN){
115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
116
if(ret == ARGP_ERR_UNKNOWN){
109
117
fprintf(stderr, "Unknown error while parsing arguments\n");
115
123
fprintf(stderr, "Starting %s\n", argv[0]);
118
126
fprintf(stderr, "Storing current terminal attributes\n");
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
129
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
122
131
perror("tcgetattr");
135
return EX_UNAVAILABLE;
126
141
sigemptyset(&new_action.sa_mask);
127
sigaddset(&new_action.sa_mask, SIGINT);
128
sigaddset(&new_action.sa_mask, SIGHUP);
129
sigaddset(&new_action.sa_mask, SIGTERM);
142
ret = sigaddset(&new_action.sa_mask, SIGINT);
147
ret = sigaddset(&new_action.sa_mask, SIGHUP);
152
ret = sigaddset(&new_action.sa_mask, SIGTERM);
157
/* Need to check if the handler is SIG_IGN before handling:
158
| [[info:libc:Initial Signal Actions]] |
159
| [[info:libc:Basic Signal Handling]] |
130
161
ret = sigaction(SIGINT, NULL, &old_action);
132
163
perror("sigaction");
135
if (old_action.sa_handler != SIG_IGN){
166
if(old_action.sa_handler != SIG_IGN){
136
167
ret = sigaction(SIGINT, &new_action, NULL);
138
169
perror("sigaction");
142
173
ret = sigaction(SIGHUP, NULL, &old_action);
144
175
perror("sigaction");
147
if (old_action.sa_handler != SIG_IGN){
178
if(old_action.sa_handler != SIG_IGN){
148
179
ret = sigaction(SIGHUP, &new_action, NULL);
150
181
perror("sigaction");
154
185
ret = sigaction(SIGTERM, NULL, &old_action);
156
187
perror("sigaction");
159
if (old_action.sa_handler != SIG_IGN){
190
if(old_action.sa_handler != SIG_IGN){
160
191
ret = sigaction(SIGTERM, &new_action, NULL);
162
193
perror("sigaction");
169
200
fprintf(stderr, "Removing echo flag from terminal attributes\n");
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
204
t_new.c_lflag &= ~(tcflag_t)ECHO;
205
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
207
perror("tcsetattr-echo");
211
return EX_UNAVAILABLE;
180
219
fprintf(stderr, "Waiting for input from stdin \n");
185
224
fprintf(stderr, "Interrupted by signal, exiting.\n");
244
320
read from stdin */
245
321
fputc('\n', stderr);
246
322
if(debug and not quit_now){
247
/* If quit_now is true, we were interrupted by a signal, and
323
/* If quit_now is nonzero, we were interrupted by a signal, and
248
324
will print that later, so no need to show this too. */
249
325
fprintf(stderr, "getline() returned 0, retrying.\n");
256
332
fprintf(stderr, "Restoring terminal attributes\n");
258
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
334
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
259
335
perror("tcsetattr+echo");
339
sigemptyset(&old_action.sa_mask);
340
old_action.sa_handler = SIG_DFL;
341
ret = sigaction(signal_received, &old_action, NULL);
345
raise(signal_received);
263
349
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
266
if(status == EXIT_SUCCESS){
352
if(status == EXIT_SUCCESS or status == EX_OK){
267
353
fputc('\n', stderr);