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* Plymouth - Read a password from Plymouth and output it
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* Copyright © 2010-2022 Teddy Hogeborn
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* Copyright © 2010-2022 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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* 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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* 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 Mandos. If not, see <http://www.gnu.org/licenses/>.
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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#define _GNU_SOURCE /* program_invocation_short_name,
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vasprintf(), asprintf(),
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TEMP_FAILURE_RETRY() */
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#include <sys/types.h> /* sig_atomic_t, pid_t, setuid(),
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geteuid(), setsid() */
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#include <argp.h> /* argp_program_version,
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argp_program_bug_address,
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ARGP_ERR_UNKNOWN, struct argp,
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argp_parse(), ARGP_IN_ORDER */
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#include <stddef.h> /* NULL, size_t */
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#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
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#include <signal.h> /* sig_atomic_t, struct sigaction,
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sigemptyset(), sigaddset(), SIGINT,
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SIGHUP, SIGTERM, sigaction(),
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#include <stdbool.h> /* bool, false, true */
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#include <stdio.h> /* FILE, fprintf(), vfprintf(),
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vasprintf(), stderr, asprintf(),
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fopen(), fscanf(), fclose(),
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#include <stdarg.h> /* va_list, va_start(), vfprintf() */
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#include <errno.h> /* program_invocation_short_name,
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errno, ENOMEM, EINTR, ENOENT,
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#include <string.h> /* strerror(), strdup(), memcmp() */
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#include <fcntl.h> /* open(), O_RDONLY */
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#include <iso646.h> /* and, or, not*/
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#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
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#include <sys/wait.h> /* waitpid() */
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#include <stddef.h> /* NULL */
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#include <string.h> /* strchr(), memcmp() */
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#include <stdio.h> /* asprintf(), perror(), fopen(),
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fscanf(), vasprintf(), fprintf(), vfprintf() */
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#include <unistd.h> /* close(), readlink(), read(),
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fork(), setsid(), chdir(), dup2(),
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STDERR_FILENO, execv(), access() */
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#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
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EXIT_SUCCESS, malloc(), _exit(),
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#include <dirent.h> /* scandir(), alphasort() */
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#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
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#include <sys/stat.h> /* struct stat, lstat() */
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#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
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#include <error.h> /* error() */
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#include <stdlib.h> /* free(), getenv(), malloc(),
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reallocarray(), realloc(),
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EXIT_FAILURE, EXIT_SUCCESS */
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#include <unistd.h> /* TEMP_FAILURE_RETRY(), setuid(),
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geteuid(), setsid(), chdir(),
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dup2(), STDERR_FILENO,
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STDOUT_FILENO, fork(), _exit(),
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execv(), ssize_t, readlink(),
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close(), read(), access(), X_OK */
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#include <signal.h> /* kill(), SIGTERM, struct sigaction,
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sigemptyset(), SIGINT, SIGHUP,
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sigaddset(), SIG_IGN */
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS(), WIFSIGNALED(),
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#include <iso646.h> /* not, and, or */
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#include <sysexits.h> /* EX_OSERR, EX_USAGE,
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#include <stdint.h> /* SIZE_MAX */
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#include <dirent.h> /* struct dirent, scandir(),
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#include <inttypes.h> /* uintmax_t, strtoumax(), SCNuMAX,
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#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK() */
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#include <fcntl.h> /* open(), O_RDONLY */
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#include <errno.h> /* TEMP_FAILURE_RETRY */
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#include <argz.h> /* argz_count(), argz_extract() */
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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 *argp_program_version = "plymouth " VERSION;
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const char *argp_program_bug_address = "<mandos@recompile.se>";
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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_pid[] = "/dev/.initramfs/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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if(interrupted_by_signal){
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interrupted_by_signal = 1;
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__attribute__((format (gnu_printf, 2, 3), nonnull))
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int fprintf_plus(FILE *stream, const char *format, ...){
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va_start (ap, format);
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fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
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return vfprintf(stream, format, ap);
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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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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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fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
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vfprintf(stderr, formatstring, ap);
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fprintf(stderr, ": ");
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fprintf(stderr, "%s\n", strerror(errnum));
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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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/* Try the new pid file location */
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uintmax_t maxvalue = 0;
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if(pidfile != NULL){
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ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
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ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
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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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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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ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
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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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even if ret == 0, therefore we need to free it. */
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even if ret == 0, we need to free it. */
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free(direntries);
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pid = (pid_t)proc_id;
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if((uintmax_t)pid == proc_id){
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pid = (pid_t)maxvalue;
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if((uintmax_t)pid == maxvalue){
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char **getargv(pid_t pid){
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const char **getargv(pid_t pid){
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char *cmdline_filename;
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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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__attribute__((unused))char **argv){
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char *prompt_arg;
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pid_t plymouth_command_pid;
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struct argp_option options[] = {
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{ .name = "prompt", .key = 128, .arg = "PROMPT",
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.doc = "The prompt to show" },
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{ .name = "debug", .key = 129,
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.doc = "Debug mode" },
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__attribute__((nonnull(3)))
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error_t parse_opt (int key, char *arg, __attribute__((unused))
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struct argp_state *state){
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case 128: /* --prompt */
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fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
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case 129: /* --debug */
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return ARGP_ERR_UNKNOWN;
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struct argp argp = { .options = options, .parser = parse_opt,
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.doc = "Mandos plymouth -- Read and"
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" output a password" };
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ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
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error_plus(0, errno, "argp_parse");
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error_plus(0, errno, "argp_parse");
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/* test -x /bin/plymouth */
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ret = access(plymouth_path, X_OK);
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/* Plymouth is probably not installed. Don't print an error
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message, just exit. */
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fprintf_plus(stderr, "Plymouth (%s) not found\n",
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exit(EX_UNAVAILABLE);
added
removed
plugins.d/plymouth.c
