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 © 2010-2018 Teddy Hogeborn
6
* Copyright © 2010-2018 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() */
36
37
#include <stddef.h> /* NULL */
37
38
#include <string.h> /* strchr(), memcmp() */
38
39
#include <stdio.h> /* asprintf(), perror(), fopen(),
39
fscanf(), vasprintf(), fprintf(), vfprintf() */
40
fscanf(), vasprintf(), fprintf(),
40
42
#include <unistd.h> /* close(), readlink(), read(),
41
43
fork(), setsid(), chdir(), dup2(),
42
44
STDERR_FILENO, execv(), access() */
53
55
#include <stdarg.h> /* va_list, va_start(), ... */
55
57
sig_atomic_t interrupted_by_signal = 0;
56
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
59
/* Used by Ubuntu 11.04 (Natty Narwahl) */
60
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
61
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
62
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
63
/* Used by Debian 9 (stretch) */
64
const char plymouth_pid[] = "/run/plymouth/pid";
57
66
const char plymouth_path[] = "/bin/plymouth";
58
67
const char plymouthd_path[] = "/sbin/plymouthd";
59
68
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
61
70
"--attach-to-session",
67
73
static void termination_handler(__attribute__((unused))int signum){
74
80
/* Function to use when printing errors */
75
void error_plus(int status, int errnum, const char *formatstring, ...){
81
__attribute__((format (gnu_printf, 3, 4)))
82
void error_plus(int status, int errnum, const char *formatstring,
80
88
va_start(ap, formatstring);
81
89
ret = vasprintf(&text, formatstring, ap);
83
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
91
fprintf(stderr, "Mandos plugin %s: ",
92
program_invocation_short_name);
84
93
vfprintf(stderr, formatstring, ap);
85
94
fprintf(stderr, ": ");
86
95
fprintf(stderr, "%s\n", strerror(errnum));
160
__attribute__((nonnull (2, 3)))
151
161
bool exec_and_wait(pid_t *pid_return, const char *path,
152
const char **argv, bool interruptable,
162
const char * const *argv, bool interruptable,
170
char **new_argv = NULL;
180
char **new_argv = malloc(sizeof(const char *));
181
if(new_argv == NULL){
182
error_plus(0, errno, "malloc");
173
for (; argv[i]!=NULL; i++){
174
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
187
for (; argv[i] != NULL; i++){
188
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
176
190
error_plus(0, errno, "realloc");
224
__attribute__((nonnull))
210
225
int is_plymouth(const struct dirent *proc_entry){
216
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
231
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
218
233
if(errno != 0 or *tmp != '\0'
219
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
234
or proc_id != (uintmax_t)((pid_t)proc_id)){
258
273
pid_t get_pid(void){
275
uintmax_t proc_id = 0;
260
276
FILE *pidfile = fopen(plymouth_pid, "r");
261
uintmax_t maxvalue = 0;
277
/* Try the new pid file location */
262
278
if(pidfile != NULL){
263
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
279
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
285
/* Try the old pid file location */
287
pidfile = fopen(plymouth_old_pid, "r");
289
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
296
/* Try the old old pid file location */
298
pidfile = fopen(plymouth_old_old_pid, "r");
300
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
307
/* Look for a plymouth process */
270
309
struct dirent **direntries = NULL;
271
310
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
273
312
error_plus(0, errno, "scandir");
276
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
278
error_plus(0, errno, "sscanf");
315
for(int i = ret-1; i >= 0; i--){
317
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
319
error_plus(0, errno, "sscanf");
281
325
/* scandir might preallocate for this variable (man page unclear).
282
even if ret == 0, we need to free it. */
326
even if ret == 0, therefore we need to free it. */
283
327
free(direntries);
286
pid = (pid_t)maxvalue;
287
if((uintmax_t)pid == maxvalue){
330
pid = (pid_t)proc_id;
331
if((uintmax_t)pid == proc_id){
294
const char **getargv(pid_t pid){
338
char **getargv(pid_t pid){
296
340
char *cmdline_filename;
360
404
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
361
return (const char **)argv;
364
408
int main(__attribute__((unused))int argc,
440
484
kill_and_wait(plymouth_command_pid);
442
const char **plymouthd_argv;
486
char **plymouthd_argv = NULL;
443
487
pid_t pid = get_pid();
445
489
error_plus(0, 0, "plymouthd pid not found");
446
plymouthd_argv = plymouthd_default_argv;
448
491
plymouthd_argv = getargv(pid);
452
495
{ plymouth_path, "quit", NULL },
498
if(plymouthd_argv != NULL){
499
free(*plymouthd_argv);
500
free(plymouthd_argv);
455
502
exit(EXIT_FAILURE);
457
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
504
bret = exec_and_wait(NULL, plymouthd_path,
505
(plymouthd_argv != NULL)
506
? (const char * const *)plymouthd_argv
507
: plymouthd_default_argv,
509
if(plymouthd_argv != NULL){
510
free(*plymouthd_argv);
511
free(plymouthd_argv);
460
514
exit(EXIT_FAILURE);
added
removed
plugins.d/plymouth.c
