3
3
* Plymouth - Read a password from Plymouth and output it
5
* Copyright © 2010-2011 Teddy Hogeborn
6
* Copyright © 2010-2011 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
5
* Copyright © 2010-2019 Teddy Hogeborn
6
* Copyright © 2010-2019 Björn Påhlsson
8
* This file is part of Mandos.
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
15
* Mandos is distributed in the hope that it will be useful, but
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
18
20
* 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/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
25
26
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
52
53
#include <errno.h> /* TEMP_FAILURE_RETRY */
53
54
#include <argz.h> /* argz_count(), argz_extract() */
54
55
#include <stdarg.h> /* va_list, va_start(), ... */
56
58
sig_atomic_t interrupted_by_signal = 0;
57
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
59
const char *argp_program_version = "plymouth " VERSION;
60
const char *argp_program_bug_address = "<mandos@recompile.se>";
62
/* Used by Ubuntu 11.04 (Natty Narwahl) */
63
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
64
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
65
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
66
/* Used by Debian 9 (stretch) */
67
const char plymouth_pid[] = "/run/plymouth/pid";
58
69
const char plymouth_path[] = "/bin/plymouth";
59
70
const char plymouthd_path[] = "/sbin/plymouthd";
60
71
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
62
73
"--attach-to-session",
68
77
static void termination_handler(__attribute__((unused))int signum){
69
78
if(interrupted_by_signal){
72
81
interrupted_by_signal = 1;
84
__attribute__((format (gnu_printf, 2, 3), nonnull))
85
int fprintf_plus(FILE *stream, const char *format, ...){
87
va_start (ap, format);
88
fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
89
return vfprintf(stream, format, ap);
75
92
/* Function to use when printing errors */
93
__attribute__((format (gnu_printf, 3, 4)))
76
94
void error_plus(int status, int errnum, const char *formatstring,
82
100
va_start(ap, formatstring);
83
101
ret = vasprintf(&text, formatstring, ap);
85
103
fprintf(stderr, "Mandos plugin %s: ",
86
104
program_invocation_short_name);
87
105
vfprintf(stderr, formatstring, ap);
172
__attribute__((nonnull (2, 3)))
154
173
bool exec_and_wait(pid_t *pid_return, const char *path,
155
const char **argv, bool interruptable,
174
const char * const * const argv, bool interruptable,
180
for(const char * const *arg = argv; *arg != NULL; arg++){
181
fprintf_plus(stderr, "exec_and_wait arg: %s\n", *arg);
183
fprintf_plus(stderr, "exec_and_wait end of args\n");
162
188
error_plus(0, errno, "fork");
173
char **new_argv = NULL;
199
char **new_argv = malloc(sizeof(const char *));
200
if(new_argv == NULL){
201
error_plus(0, errno, "malloc");
176
for (; argv[i]!=NULL; i++){
177
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
206
for (; argv[i] != NULL; i++){
207
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
179
209
error_plus(0, errno, "realloc");
198
228
and ((not interrupted_by_signal)
199
229
or (not interruptable)));
200
230
if(interrupted_by_signal and interruptable){
232
fprintf_plus(stderr, "Interrupted by signal\n");
204
237
error_plus(0, errno, "waitpid");
241
if(WIFEXITED(status)){
242
fprintf_plus(stderr, "exec_and_wait exited: %d\n",
243
WEXITSTATUS(status));
244
} else if(WIFSIGNALED(status)) {
245
fprintf_plus(stderr, "exec_and_wait signaled: %d\n",
207
249
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
255
__attribute__((nonnull))
213
256
int is_plymouth(const struct dirent *proc_entry){
219
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
262
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
221
264
if(errno != 0 or *tmp != '\0'
222
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
265
or proc_id != (uintmax_t)((pid_t)proc_id)){
261
304
pid_t get_pid(void){
306
uintmax_t proc_id = 0;
263
307
FILE *pidfile = fopen(plymouth_pid, "r");
264
uintmax_t maxvalue = 0;
308
/* Try the new pid file location */
265
309
if(pidfile != NULL){
266
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
310
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
316
/* Try the old pid file location */
318
pidfile = fopen(plymouth_old_pid, "r");
320
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
327
/* Try the old old pid file location */
329
pidfile = fopen(plymouth_old_old_pid, "r");
331
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
338
/* Look for a plymouth process */
273
340
struct dirent **direntries = NULL;
274
341
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
276
343
error_plus(0, errno, "scandir");
279
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
281
error_plus(0, errno, "sscanf");
346
for(int i = ret-1; i >= 0; i--){
348
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
350
error_plus(0, errno, "sscanf");
284
356
/* scandir might preallocate for this variable (man page unclear).
363
435
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
364
return (const char **)argv;
367
439
int main(__attribute__((unused))int argc,
368
440
__attribute__((unused))char **argv){
370
442
char *prompt_arg;
371
443
pid_t plymouth_command_pid;
448
struct argp_option options[] = {
449
{ .name = "prompt", .key = 128, .arg = "PROMPT",
450
.doc = "The prompt to show" },
451
{ .name = "debug", .key = 129,
452
.doc = "Debug mode" },
456
__attribute__((nonnull(3)))
457
error_t parse_opt (int key, char *arg, __attribute__((unused))
458
struct argp_state *state){
461
case 128: /* --prompt */
464
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
467
case 129: /* --debug */
471
return ARGP_ERR_UNKNOWN;
476
struct argp argp = { .options = options, .parser = parse_opt,
478
.doc = "Mandos plymouth -- Read and"
479
" output a password" };
480
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
487
error_plus(0, errno, "argp_parse");
490
error_plus(0, errno, "argp_parse");
375
495
/* test -x /bin/plymouth */
376
496
ret = access(plymouth_path, X_OK);
378
498
/* Plymouth is probably not installed. Don't print an error
379
499
message, just exit. */
501
fprintf_plus(stderr, "Plymouth (%s) not found\n",
380
504
exit(EX_UNAVAILABLE);
417
541
/* Plymouth is probably not running. Don't print an error
418
542
message, just exit. */
544
fprintf_plus(stderr, "Plymouth not running\n");
419
546
exit(EX_UNAVAILABLE);
422
prompt = makeprompt();
423
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
550
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
552
char *made_prompt = makeprompt();
553
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
426
557
error_plus(EX_OSERR, errno, "asprintf");
429
560
/* plymouth ask-for-password --prompt="$prompt" */
562
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
430
564
bret = exec_and_wait(&plymouth_command_pid,
431
565
plymouth_path, (const char *[])
432
566
{ plymouth_path, "ask-for-password",
443
577
kill_and_wait(plymouth_command_pid);
445
const char **plymouthd_argv;
579
char **plymouthd_argv = NULL;
446
580
pid_t pid = get_pid();
448
582
error_plus(0, 0, "plymouthd pid not found");
449
plymouthd_argv = plymouthd_default_argv;
451
584
plymouthd_argv = getargv(pid);
455
588
{ plymouth_path, "quit", NULL },
591
if(plymouthd_argv != NULL){
592
free(*plymouthd_argv);
593
free(plymouthd_argv);
458
595
exit(EXIT_FAILURE);
460
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
597
bret = exec_and_wait(NULL, plymouthd_path,
598
(plymouthd_argv != NULL)
599
? (const char * const *)plymouthd_argv
600
: plymouthd_default_argv,
602
if(plymouthd_argv != NULL){
603
free(*plymouthd_argv);
604
free(plymouthd_argv);
463
607
exit(EXIT_FAILURE);
added
removed
plugins.d/plymouth.c
