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
getopt_long, getenv() */
40
41
#include <stdio.h> /* fprintf(), stderr, getline(),
41
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
42
stdin, feof(), perror(), fputc()
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 */
76
86
.doc = "Prefix shown before the prompt", .group = 2 },
77
87
{ .name = "debug", .key = 128,
78
88
.doc = "Debug mode", .group = 3 },
90
* These reproduce what we would get without ARGP_NO_HELP
92
{ .name = "help", .key = '?',
93
.doc = "Give this help list", .group = -1 },
94
{ .name = "usage", .key = -3,
95
.doc = "Give a short usage message", .group = -1 },
96
{ .name = "version", .key = 'V',
97
.doc = "Print program version", .group = -1 },
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. */
101
error_t parse_opt (int key, char *arg, struct argp_state *state){
111
* These reproduce what we would get without ARGP_NO_HELP
113
case '?': /* --help */
114
argp_state_help(state, state->out_stream,
115
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
116
& ~(unsigned int)ARGP_HELP_EXIT_OK);
117
case -3: /* --usage */
118
argp_state_help(state, state->out_stream,
119
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
120
case 'V': /* --version */
121
fprintf(state->out_stream, "%s\n", argp_program_version);
122
exit(argp_err_exit_status);
98
125
return ARGP_ERR_UNKNOWN;
103
130
struct argp argp = { .options = options, .parser = parse_opt,
105
132
.doc = "Mandos password-prompt -- Read and"
106
133
" output a password" };
107
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
108
if (ret == ARGP_ERR_UNKNOWN){
109
fprintf(stderr, "Unknown error while parsing arguments\n");
134
ret = argp_parse(&argp, argc, argv,
135
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
142
perror("argp_parse");
115
150
fprintf(stderr, "Starting %s\n", argv[0]);
118
153
fprintf(stderr, "Storing current terminal attributes\n");
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
156
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
122
158
perror("tcgetattr");
162
return EX_UNAVAILABLE;
126
168
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);
169
ret = sigaddset(&new_action.sa_mask, SIGINT);
174
ret = sigaddset(&new_action.sa_mask, SIGHUP);
179
ret = sigaddset(&new_action.sa_mask, SIGTERM);
184
/* Need to check if the handler is SIG_IGN before handling:
185
| [[info:libc:Initial Signal Actions]] |
186
| [[info:libc:Basic Signal Handling]] |
130
188
ret = sigaction(SIGINT, NULL, &old_action);
132
190
perror("sigaction");
135
if (old_action.sa_handler != SIG_IGN){
193
if(old_action.sa_handler != SIG_IGN){
136
194
ret = sigaction(SIGINT, &new_action, NULL);
138
196
perror("sigaction");
142
200
ret = sigaction(SIGHUP, NULL, &old_action);
144
202
perror("sigaction");
147
if (old_action.sa_handler != SIG_IGN){
205
if(old_action.sa_handler != SIG_IGN){
148
206
ret = sigaction(SIGHUP, &new_action, NULL);
150
208
perror("sigaction");
154
212
ret = sigaction(SIGTERM, NULL, &old_action);
156
214
perror("sigaction");
159
if (old_action.sa_handler != SIG_IGN){
217
if(old_action.sa_handler != SIG_IGN){
160
218
ret = sigaction(SIGTERM, &new_action, NULL);
162
220
perror("sigaction");
169
227
fprintf(stderr, "Removing echo flag from terminal attributes\n");
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
231
t_new.c_lflag &= ~(tcflag_t)ECHO;
232
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
234
perror("tcsetattr-echo");
238
return EX_UNAVAILABLE;
180
246
fprintf(stderr, "Waiting for input from stdin \n");
185
251
fprintf(stderr, "Interrupted by signal, exiting.\n");
244
347
read from stdin */
245
348
fputc('\n', stderr);
246
349
if(debug and not quit_now){
247
/* If quit_now is true, we were interrupted by a signal, and
350
/* If quit_now is nonzero, we were interrupted by a signal, and
248
351
will print that later, so no need to show this too. */
249
352
fprintf(stderr, "getline() returned 0, retrying.\n");
254
359
fprintf(stderr, "Restoring terminal attributes\n");
256
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
361
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
257
362
perror("tcsetattr+echo");
366
sigemptyset(&old_action.sa_mask);
367
old_action.sa_handler = SIG_DFL;
368
ret = sigaction(signal_received, &old_action, NULL);
372
raise(signal_received);
261
376
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
264
if(status == EXIT_SUCCESS){
379
if(status == EXIT_SUCCESS or status == EX_OK){
265
380
fputc('\n', stderr);