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* Plymouth - Read a password from Plymouth and output it
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* Copyright © 2010-2011 Teddy Hogeborn
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* Copyright © 2010-2011 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* Copyright © 2010-2018 Teddy Hogeborn
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* Copyright © 2010-2018 Björn Påhlsson
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* This file is part of Mandos.
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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* Contact the authors at <mandos@recompile.se>.
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#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
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#include <stdarg.h> /* va_list, va_start(), ... */
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sig_atomic_t interrupted_by_signal = 0;
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const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
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/* Used by Ubuntu 11.04 (Natty Narwahl) */
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const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
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/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
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const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
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/* Used by Debian 9 (stretch) */
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const char plymouth_pid[] = "/run/plymouth/pid";
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const char plymouth_path[] = "/bin/plymouth";
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const char plymouthd_path[] = "/sbin/plymouthd";
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const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
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"--attach-to-session",
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static void termination_handler(__attribute__((unused))int signum){
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/* Function to use when printing errors */
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__attribute__((format (gnu_printf, 3, 4)))
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void error_plus(int status, int errnum, const char *formatstring,
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va_start(ap, formatstring);
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ret = vasprintf(&text, formatstring, ap);
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fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
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vfprintf(stderr, formatstring, ap);
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__attribute__((nonnull (2, 3)))
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bool exec_and_wait(pid_t *pid_return, const char *path,
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const char **argv, bool interruptable,
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const char * const *argv, bool interruptable,
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char **new_argv = NULL;
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char **new_argv = malloc(sizeof(const char *));
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if(new_argv == NULL){
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error_plus(0, errno, "malloc");
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for (; argv[i]!=NULL; i++){
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tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
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for (; argv[i] != NULL; i++){
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tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
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error_plus(0, errno, "realloc");
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__attribute__((nonnull))
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int is_plymouth(const struct dirent *proc_entry){
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maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
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proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
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if(errno != 0 or *tmp != '\0'
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or maxvalue != (uintmax_t)((pid_t)maxvalue)){
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or proc_id != (uintmax_t)((pid_t)proc_id)){
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pid_t get_pid(void){
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uintmax_t proc_id = 0;
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FILE *pidfile = fopen(plymouth_pid, "r");
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uintmax_t maxvalue = 0;
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/* Try the new pid file location */
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if(pidfile != NULL){
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ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
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ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
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/* Try the old pid file location */
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pidfile = fopen(plymouth_old_pid, "r");
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ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
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/* Try the old old pid file location */
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pidfile = fopen(plymouth_old_old_pid, "r");
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ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
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/* Look for a plymouth process */
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struct dirent **direntries = NULL;
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ret = scandir("/proc", &direntries, is_plymouth, alphasort);
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error_plus(0, errno, "scandir");
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ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
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error_plus(0, errno, "sscanf");
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for(int i = ret-1; i >= 0; i--){
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ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
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error_plus(0, errno, "sscanf");
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/* scandir might preallocate for this variable (man page unclear).
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argz_extract(cmdline, cmdline_len, argv); /* Create argv */
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return (const char **)argv;
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int main(__attribute__((unused))int argc,
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kill_and_wait(plymouth_command_pid);
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const char **plymouthd_argv;
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char **plymouthd_argv = NULL;
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pid_t pid = get_pid();
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error_plus(0, 0, "plymouthd pid not found");
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plymouthd_argv = plymouthd_default_argv;
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plymouthd_argv = getargv(pid);
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{ plymouth_path, "quit", NULL },
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if(plymouthd_argv != NULL){
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free(*plymouthd_argv);
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free(plymouthd_argv);
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exit(EXIT_FAILURE);
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bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
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bret = exec_and_wait(NULL, plymouthd_path,
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(plymouthd_argv != NULL)
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? (const char * const *)plymouthd_argv
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: plymouthd_default_argv,
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if(plymouthd_argv != NULL){
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free(*plymouthd_argv);
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free(plymouthd_argv);
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exit(EXIT_FAILURE);
added
removed
plugins.d/plymouth.c
