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,
39
getopt_long, getenv() */
41
40
#include <stdio.h> /* fprintf(), stderr, getline(),
42
stdin, feof(), perror(), fputc()
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
41
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
47
44
#include <iso646.h> /* or, not */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
83
73
struct argp_option options[] = {
84
74
{ .name = "prefix", .key = 'p',
85
75
.arg = "PREFIX", .flags = 0,
86
.doc = "Prefix shown before the prompt", .group = 2 },
76
.doc = "Prefix used before the passprompt", .group = 2 },
87
77
{ .name = "debug", .key = 128,
88
78
.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 },
101
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. */
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);
125
98
return ARGP_ERR_UNKNOWN;
130
103
struct argp argp = { .options = options, .parser = parse_opt,
132
.doc = "Mandos password-prompt -- Read and"
133
" output a password" };
134
ret = argp_parse(&argp, argc, argv,
135
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
142
perror("argp_parse");
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, "Unknown error while parsing arguments\n");
150
114
fprintf(stderr, "Starting %s\n", argv[0]);
153
117
fprintf(stderr, "Storing current terminal attributes\n");
156
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
162
return EX_UNAVAILABLE;
120
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
168
124
sigemptyset(&new_action.sa_mask);
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]] |
125
sigaddset(&new_action.sa_mask, SIGINT);
126
sigaddset(&new_action.sa_mask, SIGHUP);
127
sigaddset(&new_action.sa_mask, SIGTERM);
188
128
ret = sigaction(SIGINT, NULL, &old_action);
190
130
perror("sigaction");
193
if(old_action.sa_handler != SIG_IGN){
133
if (old_action.sa_handler != SIG_IGN){
194
134
ret = sigaction(SIGINT, &new_action, NULL);
196
136
perror("sigaction");
200
140
ret = sigaction(SIGHUP, NULL, &old_action);
202
142
perror("sigaction");
205
if(old_action.sa_handler != SIG_IGN){
145
if (old_action.sa_handler != SIG_IGN){
206
146
ret = sigaction(SIGHUP, &new_action, NULL);
208
148
perror("sigaction");
212
152
ret = sigaction(SIGTERM, NULL, &old_action);
214
154
perror("sigaction");
217
if(old_action.sa_handler != SIG_IGN){
157
if (old_action.sa_handler != SIG_IGN){
218
158
ret = sigaction(SIGTERM, &new_action, NULL);
220
160
perror("sigaction");
227
167
fprintf(stderr, "Removing echo flag from terminal attributes\n");
231
t_new.c_lflag &= ~(tcflag_t)ECHO;
232
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
171
t_new.c_lflag &= ~ECHO;
172
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
234
173
perror("tcsetattr-echo");
238
return EX_UNAVAILABLE;
246
178
fprintf(stderr, "Waiting for input from stdin \n");
251
fprintf(stderr, "Interrupted by signal, exiting.\n");
253
182
status = EXIT_FAILURE;
280
209
ret = getline(&buffer, &n, stdin);
211
fprintf(stdout, "%s", buffer);
282
212
status = EXIT_SUCCESS;
283
/* Make n = data size instead of allocated buffer size */
285
/* Strip final newline */
286
if(n > 0 and buffer[n-1] == '\n'){
287
buffer[n-1] = '\0'; /* not strictly necessary */
292
ret = write(STDOUT_FILENO, buffer + written, n - written);
307
status = EXIT_FAILURE;
312
written += (size_t)ret;
314
ret = close(STDOUT_FILENO);
332
if(errno != EINTR and not feof(stdin)){
216
if (errno != EINTR and not feof(stdin)){
333
217
perror("getline");
336
status = EX_UNAVAILABLE;
218
status = EXIT_FAILURE;
346
222
/* if(ret == 0), then the only sensible thing to do is to retry to
347
223
read from stdin */
348
224
fputc('\n', stderr);
349
if(debug and not quit_now){
350
/* If quit_now is nonzero, we were interrupted by a signal, and
351
will print that later, so no need to show this too. */
352
fprintf(stderr, "getline() returned 0, retrying.\n");
359
228
fprintf(stderr, "Restoring terminal attributes\n");
361
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
230
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
362
231
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);
376
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
379
if(status == EXIT_SUCCESS or status == EX_OK){
235
fprintf(stderr, "%s is exiting\n", argv[0]);