3
3
* Passprompt - Read a password from the terminal and print it
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn and 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
25
25
#define _GNU_SOURCE /* getline() */
26
#define _FORTIFY_SOURCE 2
27
28
#include <termios.h> /* struct termios, tcsetattr(),
28
29
TCSAFLUSH, tcgetattr(), ECHO */
33
34
sigaction, sigemptyset(),
34
35
sigaction(), sigaddset(), SIGINT,
35
36
SIGQUIT, SIGHUP, SIGTERM */
36
#include <stddef.h> /* NULL, size_t, ssize_t */
37
#include <stddef.h> /* NULL, size_t */
37
38
#include <sys/types.h> /* ssize_t */
38
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
44
45
#include <iso646.h> /* or, not */
45
46
#include <stdbool.h> /* bool, false, true */
46
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
47
#include <argp.h> /* struct argp_option, struct
48
argp_state, struct argp,
49
argp_parse(), error_t,
50
ARGP_KEY_ARG, ARGP_KEY_END,
48
#include <getopt.h> /* getopt_long */
53
50
volatile bool quit_now = false;
54
51
bool debug = false;
55
const char *argp_program_version = "password-prompt 1.0";
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
58
static void termination_handler(__attribute__((unused))int signum){
53
void termination_handler(__attribute__((unused))int signum){
69
64
struct sigaction old_action,
70
65
new_action = { .sa_handler = termination_handler,
73
struct argp_option options[] = {
74
{ .name = "prefix", .key = 'p',
75
.arg = "PREFIX", .flags = 0,
76
.doc = "Prefix used before the passprompt", .group = 2 },
77
{ .name = "debug", .key = 128,
78
.doc = "Debug mode", .group = 3 },
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. */
98
return ARGP_ERR_UNKNOWN;
69
static struct option long_options[] = {
70
{"debug", no_argument, (int *)&debug, 1},
71
{"prefix", required_argument, 0, 'p'},
75
ret = getopt_long (argc, argv, "p:", long_options, &option_index);
103
struct argp argp = { .options = options, .parser = parse_opt,
105
.doc = "Mandos Passprompt -- Provides a passprompt" };
106
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
107
if (ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unkown error while parsing arguments\n");
88
fprintf(stderr, "bad arguments\n");
114
94
fprintf(stderr, "Starting %s\n", argv[0]);
124
104
sigemptyset(&new_action.sa_mask);
125
105
sigaddset(&new_action.sa_mask, SIGINT);
106
sigaddset(&new_action.sa_mask, SIGQUIT);
126
107
sigaddset(&new_action.sa_mask, SIGHUP);
127
108
sigaddset(&new_action.sa_mask, SIGTERM);
128
ret = sigaction(SIGINT, NULL, &old_action);
133
if (old_action.sa_handler != SIG_IGN){
134
ret = sigaction(SIGINT, &new_action, NULL);
140
ret = sigaction(SIGHUP, NULL, &old_action);
145
if (old_action.sa_handler != SIG_IGN){
146
ret = sigaction(SIGHUP, &new_action, NULL);
152
ret = sigaction(SIGTERM, NULL, &old_action);
157
if (old_action.sa_handler != SIG_IGN){
158
ret = sigaction(SIGTERM, &new_action, NULL);
109
sigaction(SIGINT, NULL, &old_action);
110
if (old_action.sa_handler != SIG_IGN)
111
sigaction(SIGINT, &new_action, NULL);
112
sigaction(SIGQUIT, NULL, &old_action);
113
if (old_action.sa_handler != SIG_IGN)
114
sigaction(SIGQUIT, &new_action, NULL);
115
sigaction(SIGHUP, NULL, &old_action);
116
if (old_action.sa_handler != SIG_IGN)
117
sigaction(SIGHUP, &new_action, NULL);
118
sigaction(SIGTERM, NULL, &old_action);
119
if (old_action.sa_handler != SIG_IGN)
120
sigaction(SIGTERM, &new_action, NULL);
167
124
fprintf(stderr, "Removing echo flag from terminal attributes\n");
204
/* if(ret == 0), then the only sensible thing to do is to retry to
206
162
fputc('\n', stderr);
210
166
fprintf(stderr, "Restoring terminal attributes\n");
212
168
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
213
169
perror("tcsetattr+echo");
217
173
fprintf(stderr, "%s is exiting\n", argv[0]);