31
6
#include <stdbool.h> /* bool, false, true */
32
7
#include <fcntl.h> /* open(), O_RDONLY */
33
8
#include <iso646.h> /* and, or, not*/
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct dirent,
36
11
#include <sys/wait.h> /* waitpid() */
37
12
#include <stddef.h> /* NULL */
38
13
#include <string.h> /* strchr(), memcmp() */
39
#include <stdio.h> /* asprintf(), perror(), fopen(),
40
fscanf(), vasprintf(), fprintf(),
42
#include <unistd.h> /* close(), readlink(), read(),
43
fork(), setsid(), chdir(), dup2(),
14
#include <stdio.h> /* asprintf(), perror(), fopen(), fscanf() */
15
#include <unistd.h> /* close(), readlink(), read(), fork()
16
setsid(), chdir(), dup2()
44
17
STDERR_FILENO, execv(), access() */
45
18
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
19
EXIT_SUCCESS, malloc(), _exit(),
48
21
#include <dirent.h> /* scandir(), alphasort() */
49
22
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
50
23
#include <sys/stat.h> /* struct stat, lstat() */
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
24
#include <sysexits.h> /* EX_OSERR */
52
25
#include <error.h> /* error() */
53
26
#include <errno.h> /* TEMP_FAILURE_RETRY */
54
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
58
29
sig_atomic_t interrupted_by_signal = 0;
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";
30
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
69
31
const char plymouth_path[] = "/bin/plymouth";
70
32
const char plymouthd_path[] = "/sbin/plymouthd";
71
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
33
const char *plymouthd_default_argv[] = {"/sbin/plymouthd", "--mode=boot",
73
34
"--attach-to-session",
35
"--pid-file=/dev/.initramfs/plymouth.pid",
77
38
static void termination_handler(__attribute__((unused))int signum){
78
39
if(interrupted_by_signal){
81
42
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);
92
/* Function to use when printing errors */
93
__attribute__((format (gnu_printf, 3, 4)))
94
void error_plus(int status, int errnum, const char *formatstring,
100
va_start(ap, formatstring);
101
ret = vasprintf(&text, formatstring, ap);
103
fprintf(stderr, "Mandos plugin %s: ",
104
program_invocation_short_name);
105
vfprintf(stderr, formatstring, ap);
106
fprintf(stderr, ": ");
107
fprintf(stderr, "%s\n", strerror(errnum));
108
error(status, errno, "vasprintf while printing error");
111
fprintf(stderr, "Mandos plugin ");
112
error(status, errnum, "%s", text);
116
45
/* Create prompt string */
117
46
char *makeprompt(void){
120
49
const char *const cryptsource = getenv("cryptsource");
121
50
const char *const crypttarget = getenv("crypttarget");
122
const char prompt_start[] = "Unlocking the disk";
123
const char prompt_end[] = "Enter passphrase";
51
const char prompt_start[] = "Enter passphrase to unlock the disk";
125
53
if(cryptsource == NULL){
126
54
if(crypttarget == NULL){
127
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
55
ret = asprintf(&prompt, "%s: ", prompt_start);
129
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
130
crypttarget, prompt_end);
57
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
133
61
if(crypttarget == NULL){
134
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
62
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
137
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
138
cryptsource, crypttarget, prompt_end);
64
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
65
cryptsource, crypttarget);
228
143
and ((not interrupted_by_signal)
229
144
or (not interruptable)));
230
145
if(interrupted_by_signal and interruptable){
232
fprintf_plus(stderr, "Interrupted by signal\n");
237
error_plus(0, errno, "waitpid");
149
error(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",
249
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
152
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
255
__attribute__((nonnull))
256
158
int is_plymouth(const struct dirent *proc_entry){
262
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
164
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
264
if(errno != 0 or *tmp != '\0'
265
or proc_id != (uintmax_t)((pid_t)proc_id)){
166
if(errno != 0 or *tmp != '\0' or maxvalue != (uintmax_t)((pid_t)maxvalue)){
269
char exe_target[sizeof(plymouthd_path)];
170
char exe_target[sizeof(plymouth_path)];
271
172
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
273
error_plus(0, errno, "asprintf");
174
error(0, errno, "asprintf");
277
178
struct stat exe_stat;
278
179
ret = lstat(exe_link, &exe_stat);
281
182
if(errno != ENOENT){
282
error_plus(0, errno, "lstat");
183
error(0, errno, "lstat");
304
205
pid_t get_pid(void){
306
uintmax_t proc_id = 0;
307
207
FILE *pidfile = fopen(plymouth_pid, "r");
308
/* Try the new pid file location */
208
uintmax_t maxvalue = 0;
309
209
if(pidfile != NULL){
310
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
210
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
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 */
340
struct dirent **direntries = NULL;
217
struct dirent **direntries;
341
218
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
343
error_plus(0, errno, "scandir");
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");
356
/* scandir might preallocate for this variable (man page unclear).
357
even if ret == 0, therefore we need to free it. */
219
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
361
pid = (pid_t)proc_id;
362
if((uintmax_t)pid == proc_id){
222
pid = (pid_t)maxvalue;
223
if((uintmax_t)pid == maxvalue){
369
char **getargv(pid_t pid){
230
const char **getargv(pid_t pid){
371
232
char *cmdline_filename;
419
280
} while(sret != 0);
420
281
ret = close(cl_fd);
422
error_plus(0, errno, "close");
283
error(0, errno, "close");
427
288
/* we got cmdline and cmdline_len, ignore rest... */
428
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
429
* sizeof(char *)); /* Get number of args */
431
error_plus(0, errno, "argv = malloc()");
289
const char **argv = NULL;
290
size_t argv_size = 0;
291
for(char *arg = cmdline; arg-cmdline < (ssize_t)cmdline_len;
292
arg = strchr(arg, '\0')+1){
293
tmp = realloc(argv, ((++argv_size)+1)*sizeof(char *));
295
error(0, errno, "realloc");
299
argv = (const char **)tmp;
300
argv[argv_size-1] = arg;
435
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
302
argv[argv_size] = NULL;
439
306
int main(__attribute__((unused))int argc,
440
307
__attribute__((unused))char **argv){
442
309
char *prompt_arg;
443
310
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");
495
314
/* test -x /bin/plymouth */
496
315
ret = access(plymouth_path, X_OK);
498
/* Plymouth is probably not installed. Don't print an error
499
message, just exit. */
501
fprintf_plus(stderr, "Plymouth (%s) not found\n",
504
exit(EX_UNAVAILABLE);
507
320
{ /* Add signal handlers */
508
321
struct sigaction old_action,
509
322
new_action = { .sa_handler = termination_handler,
511
324
sigemptyset(&new_action.sa_mask);
512
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
325
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
514
326
ret = sigaddset(&new_action.sa_mask, *sig);
516
error_plus(EX_OSERR, errno, "sigaddset");
328
error(0, errno, "sigaddset");
518
331
ret = sigaction(*sig, NULL, &old_action);
520
error_plus(EX_OSERR, errno, "sigaction");
333
error(0, errno, "sigaction");
522
336
if(old_action.sa_handler != SIG_IGN){
523
337
ret = sigaction(*sig, &new_action, NULL);
525
error_plus(EX_OSERR, errno, "sigaction");
339
error(0, errno, "sigaction");
531
346
/* plymouth --ping */
532
347
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
534
{ plymouth_path, "--ping", NULL },
348
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
537
351
if(interrupted_by_signal){
538
352
kill_and_wait(plymouth_command_pid);
541
/* Plymouth is probably not running. Don't print an error
542
message, just exit. */
544
fprintf_plus(stderr, "Plymouth not running\n");
546
exit(EX_UNAVAILABLE);
550
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
552
char *made_prompt = makeprompt();
553
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
357
prompt = makeprompt();
358
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
557
error_plus(EX_OSERR, errno, "asprintf");
361
error(0, errno, "asprintf");
560
365
/* plymouth ask-for-password --prompt="$prompt" */
562
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
564
bret = exec_and_wait(&plymouth_command_pid,
565
plymouth_path, (const char *[])
566
{ plymouth_path, "ask-for-password",
366
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
367
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
569
369
free(prompt_arg);
371
if(interrupted_by_signal){
372
kill_and_wait(plymouth_command_pid);
571
379
exit(EXIT_SUCCESS);
573
if(not interrupted_by_signal){
574
/* exec_and_wait failed for some other reason */
577
kill_and_wait(plymouth_command_pid);
579
char **plymouthd_argv = NULL;
382
const char **plymouthd_argv = NULL;
580
383
pid_t pid = get_pid();
582
error_plus(0, 0, "plymouthd pid not found");
385
error(0, 0, "plymouthd pid not found");
584
387
plymouthd_argv = getargv(pid);
389
if(plymouthd_argv == NULL){
390
plymouthd_argv = plymouthd_default_argv;
587
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
588
{ plymouth_path, "quit", NULL },
591
if(plymouthd_argv != NULL){
592
free(*plymouthd_argv);
593
free(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);
609
exec_and_wait(NULL, plymouth_path, (const char *[])
610
{ plymouth_path, "show-splash", NULL },
393
bret = exec_and_wait(NULL, plymouth_path,
394
(const char *[]){plymouth_path, "quit", NULL}, false, false);
398
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv, false, true);
402
exec_and_wait(NULL, plymouth_path,
403
(const char *[]){ plymouth_path, "show-splash", NULL }, false, false);
612
404
exit(EXIT_FAILURE);