1
/* -*- coding: utf-8 -*- */
3
* Plymouth - Read a password from Plymouth and output it
5
* Copyright © 2010 Teddy Hogeborn
6
* Copyright © 2010 Björn Påhlsson
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
13
* This program is distributed in the hope that it will be useful, but
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
18
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
1
25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
2
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
3
27
sigemptyset(), sigaddset(), SIGINT,
6
30
#include <stdbool.h> /* bool, false, true */
7
31
#include <fcntl.h> /* open(), O_RDONLY */
8
32
#include <iso646.h> /* and, or, not*/
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct dirent,
33
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
11
35
#include <sys/wait.h> /* waitpid() */
12
36
#include <stddef.h> /* NULL */
13
37
#include <string.h> /* strchr(), memcmp() */
14
#include <stdio.h> /* asprintf(), perror(), fopen(), fscanf() */
15
#include <unistd.h> /* close(), readlink(), read(), fork()
16
setsid(), chdir(), dup2()
38
#include <stdio.h> /* asprintf(), perror(), fopen(),
40
#include <unistd.h> /* close(), readlink(), read(),
41
fork(), setsid(), chdir(), dup2(),
17
42
STDERR_FILENO, execv(), access() */
18
43
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
19
44
EXIT_SUCCESS, malloc(), _exit(),
49
77
const char *const cryptsource = getenv("cryptsource");
50
78
const char *const crypttarget = getenv("crypttarget");
51
const char prompt_start[] = "Enter passphrase to unlock the disk";
79
const char prompt_start[] = "Unlocking the disk";
80
const char prompt_end[] = "Enter passphrase";
53
82
if(cryptsource == NULL){
54
83
if(crypttarget == NULL){
55
ret = asprintf(&prompt, "%s: ", prompt_start);
84
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
57
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
86
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
87
crypttarget, prompt_end);
61
90
if(crypttarget == NULL){
62
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
91
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
64
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
65
cryptsource, crypttarget);
94
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
95
cryptsource, crypttarget, prompt_end);
308
347
/* test -x /bin/plymouth */
309
348
ret = access(plymouth_path, X_OK);
350
/* Plymouth is probably not installed. Don't print an error
351
message, just exit. */
352
exit(EX_UNAVAILABLE);
314
355
{ /* Add signal handlers */
315
356
struct sigaction old_action,
316
357
new_action = { .sa_handler = termination_handler,
318
359
sigemptyset(&new_action.sa_mask);
319
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
360
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
320
362
ret = sigaddset(&new_action.sa_mask, *sig);
322
error(0, errno, "sigaddset");
364
error(EX_OSERR, errno, "sigaddset");
325
366
ret = sigaction(*sig, NULL, &old_action);
327
error(0, errno, "sigaction");
368
error(EX_OSERR, errno, "sigaction");
330
370
if(old_action.sa_handler != SIG_IGN){
331
371
ret = sigaction(*sig, &new_action, NULL);
333
error(0, errno, "sigaction");
373
error(EX_OSERR, errno, "sigaction");
340
379
/* plymouth --ping */
341
380
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
342
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
382
{ plymouth_path, "--ping", NULL },
345
385
if(interrupted_by_signal){
346
386
kill_and_wait(plymouth_command_pid);
389
/* Plymouth is probably not running. Don't print an error
390
message, just exit. */
391
exit(EX_UNAVAILABLE);
351
394
prompt = makeprompt();
352
395
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
355
error(0, errno, "asprintf");
398
error(EX_OSERR, errno, "asprintf");
359
401
/* plymouth ask-for-password --prompt="$prompt" */
360
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
361
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
402
bret = exec_and_wait(&plymouth_command_pid,
403
plymouth_path, (const char *[])
404
{ plymouth_path, "ask-for-password",
363
407
free(prompt_arg);
365
if(interrupted_by_signal){
366
kill_and_wait(plymouth_command_pid);
373
409
exit(EXIT_SUCCESS);
411
if(not interrupted_by_signal){
412
/* exec_and_wait failed for some other reason */
415
kill_and_wait(plymouth_command_pid);
376
const char **plymouthd_argv = NULL;
417
const char **plymouthd_argv;
377
418
pid_t pid = get_pid();
379
420
error(0, 0, "plymouthd pid not found");
421
plymouthd_argv = plymouthd_default_argv;
381
423
plymouthd_argv = getargv(pid);
383
if(plymouthd_argv == NULL){
384
plymouthd_argv = plymouthd_default_argv;
387
bret = exec_and_wait(NULL, plymouth_path,
388
(const char *[]){plymouth_path, "quit", NULL}, false, false);
392
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv, false, true);
396
exec_and_wait(NULL, plymouth_path,
397
(const char *[]){ plymouth_path, "show-splash", NULL }, false, false);
426
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
427
{ plymouth_path, "quit", NULL },
432
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
437
exec_and_wait(NULL, plymouth_path, (const char *[])
438
{ plymouth_path, "show-splash", NULL },
398
440
exit(EXIT_FAILURE);