6
31
#include <stdbool.h> /* bool, false, true */
7
32
#include <fcntl.h> /* open(), O_RDONLY */
8
33
#include <iso646.h> /* and, or, not*/
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct dirent,
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
11
36
#include <sys/wait.h> /* waitpid() */
12
37
#include <stddef.h> /* NULL */
13
38
#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()
39
#include <stdio.h> /* asprintf(), perror(), fopen(),
40
fscanf(), vasprintf(), fprintf(),
42
#include <unistd.h> /* close(), readlink(), read(),
43
fork(), setsid(), chdir(), dup2(),
17
44
STDERR_FILENO, execv(), access() */
18
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
19
46
EXIT_SUCCESS, malloc(), _exit(),
21
48
#include <dirent.h> /* scandir(), alphasort() */
22
49
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
23
50
#include <sys/stat.h> /* struct stat, lstat() */
24
#include <sysexits.h> /* EX_OSERR */
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
25
52
#include <error.h> /* error() */
26
53
#include <errno.h> /* TEMP_FAILURE_RETRY */
54
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
29
58
sig_atomic_t interrupted_by_signal = 0;
30
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";
31
69
const char plymouth_path[] = "/bin/plymouth";
32
70
const char plymouthd_path[] = "/sbin/plymouthd";
33
const char *plymouthd_default_argv[] = {"/sbin/plymouthd", "--mode=boot",
71
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
34
73
"--attach-to-session",
35
"--pid-file=/dev/.initramfs/plymouth.pid",
38
77
static void termination_handler(__attribute__((unused))int signum){
39
78
if(interrupted_by_signal){
42
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);
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);
45
116
/* Create prompt string */
46
117
char *makeprompt(void){
49
120
const char *const cryptsource = getenv("cryptsource");
50
121
const char *const crypttarget = getenv("crypttarget");
51
const char prompt_start[] = "Enter passphrase to unlock the disk";
122
const char prompt_start[] = "Unlocking the disk";
123
const char prompt_end[] = "Enter passphrase";
53
125
if(cryptsource == NULL){
54
126
if(crypttarget == NULL){
55
ret = asprintf(&prompt, "%s: ", prompt_start);
127
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
57
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
129
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
130
crypttarget, prompt_end);
61
133
if(crypttarget == NULL){
62
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
134
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
64
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
65
cryptsource, crypttarget);
137
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
138
cryptsource, crypttarget, prompt_end);
143
228
and ((not interrupted_by_signal)
144
229
or (not interruptable)));
145
230
if(interrupted_by_signal and interruptable){
232
fprintf_plus(stderr, "Interrupted by signal\n");
149
error(0, errno, "waitpid");
237
error_plus(0, errno, "waitpid");
152
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
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)){
255
__attribute__((nonnull))
158
256
int is_plymouth(const struct dirent *proc_entry){
164
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
262
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
166
if(errno != 0 or *tmp != '\0' or maxvalue != (uintmax_t)((pid_t)maxvalue)){
264
if(errno != 0 or *tmp != '\0'
265
or proc_id != (uintmax_t)((pid_t)proc_id)){
170
char exe_target[sizeof(plymouth_path)];
269
char exe_target[sizeof(plymouthd_path)];
172
271
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
174
error(0, errno, "asprintf");
273
error_plus(0, errno, "asprintf");
178
277
struct stat exe_stat;
179
278
ret = lstat(exe_link, &exe_stat);
182
281
if(errno != ENOENT){
183
error(0, errno, "lstat");
282
error_plus(0, errno, "lstat");
205
304
pid_t get_pid(void){
306
uintmax_t proc_id = 0;
207
307
FILE *pidfile = fopen(plymouth_pid, "r");
208
uintmax_t maxvalue = 0;
308
/* Try the new pid file location */
209
309
if(pidfile != NULL){
210
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
310
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
217
struct dirent **direntries;
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;
218
341
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
219
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
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. */
222
pid = (pid_t)maxvalue;
223
if((uintmax_t)pid == maxvalue){
361
pid = (pid_t)proc_id;
362
if((uintmax_t)pid == proc_id){
230
const char **getargv(pid_t pid){
369
char **getargv(pid_t pid){
232
371
char *cmdline_filename;
280
419
} while(sret != 0);
281
420
ret = close(cl_fd);
283
error(0, errno, "close");
422
error_plus(0, errno, "close");
288
427
/* we got cmdline and cmdline_len, ignore rest... */
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;
428
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
429
* sizeof(char *)); /* Get number of args */
431
error_plus(0, errno, "argv = malloc()");
302
argv[argv_size] = NULL;
435
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
306
439
int main(__attribute__((unused))int argc,
307
440
__attribute__((unused))char **argv){
309
442
char *prompt_arg;
310
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");
314
495
/* test -x /bin/plymouth */
315
496
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);
320
507
{ /* Add signal handlers */
321
508
struct sigaction old_action,
322
509
new_action = { .sa_handler = termination_handler,
324
511
sigemptyset(&new_action.sa_mask);
325
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
512
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
326
514
ret = sigaddset(&new_action.sa_mask, *sig);
328
error(0, errno, "sigaddset");
516
error_plus(EX_OSERR, errno, "sigaddset");
331
518
ret = sigaction(*sig, NULL, &old_action);
333
error(0, errno, "sigaction");
520
error_plus(EX_OSERR, errno, "sigaction");
336
522
if(old_action.sa_handler != SIG_IGN){
337
523
ret = sigaction(*sig, &new_action, NULL);
339
error(0, errno, "sigaction");
525
error_plus(EX_OSERR, errno, "sigaction");
346
531
/* plymouth --ping */
347
532
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
348
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
534
{ plymouth_path, "--ping", NULL },
351
537
if(interrupted_by_signal){
352
538
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);
357
prompt = makeprompt();
358
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);
361
error(0, errno, "asprintf");
557
error_plus(EX_OSERR, errno, "asprintf");
365
560
/* plymouth ask-for-password --prompt="$prompt" */
366
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
367
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
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",
369
569
free(prompt_arg);
371
if(interrupted_by_signal){
372
kill_and_wait(plymouth_command_pid);
379
571
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);
382
const char **plymouthd_argv = NULL;
579
char **plymouthd_argv = NULL;
383
580
pid_t pid = get_pid();
385
error(0, 0, "plymouthd pid not found");
582
error_plus(0, 0, "plymouthd pid not found");
387
584
plymouthd_argv = getargv(pid);
389
if(plymouthd_argv == NULL){
390
plymouthd_argv = plymouthd_default_argv;
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);
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 },
404
612
exit(EXIT_FAILURE);