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#define _GNU_SOURCE /* asprintf() */
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#include <signal.h> /* sig_atomic_t, struct sigaction,
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sigemptyset(), sigaddset(),
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sigaction, SIGINT, SIG_IGN, SIGHUP,
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SIGTERM, kill(), SIGKILL */
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sigemptyset(), sigaddset(), SIGINT,
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SIGHUP, SIGTERM, sigaction(),
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SIG_IGN, kill(), SIGKILL */
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#include <stdbool.h> /* bool, false, true */
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#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
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#include <errno.h> /* errno, EINTR */
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#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR,
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#include <stddef.h> /* NULL */
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#include <string.h> /* strlen(), memcmp() */
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#include <stdio.h> /* asprintf(), perror() */
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#include <unistd.h> /* close(), write(), readlink(),
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read(), STDOUT_FILENO, sleep(),
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fork(), setuid(), geteuid(),
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setsid(), chdir(), dup2(),
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STDERR_FILENO, execv() */
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#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
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realloc(), EXIT_SUCCESS, malloc(),
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#include <stdlib.h> /* getenv() */
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#include <stdio.h> /* asprintf(), perror() */
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#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS,
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#include <sys/types.h> /* pid_t, DIR, struct dirent,
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#include <dirent.h> /* opendir(), readdir(), closedir() */
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#include <unistd.h> /* readlink(), fork(), execl(),
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#include <string.h> /* memcmp() */
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#include <iso646.h> /* and */
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#include <stdbool.h> /* bool, false, true */
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#include <errno.h> /* errno */
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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#include <fcntl.h> /* open(), O_RDONLY */
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sig_atomic_t interrupted_by_signal = 0;
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interrupted_by_signal = 1;
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static bool usplash_write(const char *cmd, const char *arg){
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* usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
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* usplash_write("PULSATE", NULL); -> "PULSATE\0"
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fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
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if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
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}while(fifo_fd == -1);
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char *cmd_line_alloc = NULL;
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cmd_line_len = strlen(cmd);
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ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
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if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
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cmd_line = cmd_line_alloc;
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cmd_line_len = (size_t)ret + 1;
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while(not interrupted_by_signal and written < cmd_line_len){
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ret = write(fifo_fd, cmd_line + written,
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cmd_line_len - written);
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if(errno != EINTR or interrupted_by_signal){
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written += (size_t)ret;
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if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
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if(interrupted_by_signal){
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int main(__attribute__((unused))int argc,
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__attribute__((unused))char **argv){
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/* Write command to FIFO */
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if(not interrupted_by_signal){
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int fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
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ret = asprintf(&command, "INPUTQUIET %s", prompt);
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size_t command_len = (size_t)ret + 1;
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while(not interrupted_by_signal and written < command_len){
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ret = write(fifo_fd, command + written, command_len - written);
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if(interrupted_by_signal){
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an_error_occured = true;
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written += (size_t)ret;
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ret = close(fifo_fd);
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if(ret == -1 and not interrupted_by_signal){
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an_error_occured = true;
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if(not usplash_write("TIMEOUT", "0")
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and (errno != EINTR)){
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perror("usplash_write");
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an_error_occured = true;
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if(not interrupted_by_signal and not an_error_occured){
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if(not usplash_write("INPUTQUIET", prompt)
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and (errno != EINTR)){
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perror("usplash_write");
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an_error_occured = true;
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/* This is not really a loop; while() is used to be able to "break"
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out of it; those breaks are marked "Big" */
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while(not interrupted_by_signal and not an_error_occured){
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char *buf = NULL;
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size_t buf_len = 0;
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fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
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an_error_occured = true;
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if(interrupted_by_signal){
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}while(fifo_fd == -1);
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if(interrupted_by_signal or an_error_occured){
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/* Read from FIFO */
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if(not interrupted_by_signal and not an_error_occured){
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int fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
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if(fifo_fd == -1 and not interrupted_by_signal){
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size_t buf_allocated = 0;
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const size_t blocksize = 1024;
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if(buf_len + blocksize > buf_allocated){
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char *tmp = realloc(buf, buf_allocated + blocksize);
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an_error_occured = true;
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buf_allocated += blocksize;
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size_t buf_allocated = 0;
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const int blocksize = 1024;
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if(buf_len + blocksize > buf_allocated){
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char *tmp = realloc(buf, buf_allocated + blocksize);
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an_error_occured = true;
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buf_allocated += blocksize;
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sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
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an_error_occured = true;
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an_error_occured = true;
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if(interrupted_by_signal){
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buf_len += (size_t)sret;
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}while(not interrupted_by_signal and sret != 0);
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if(interrupted_by_signal or an_error_occured){
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buf_len += (size_t)sret;
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if(interrupted_by_signal or an_error_occured){
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if(not usplash_write("TIMEOUT", "15")
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and (errno != EINTR)){
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perror("usplash_write");
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an_error_occured = true;
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if(interrupted_by_signal or an_error_occured){
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/* Print password to stdout */
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if(not interrupted_by_signal and not an_error_occured){
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while(written < buf_len){
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sret = write(STDOUT_FILENO, buf + written, buf_len - written);
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if(sret == -1 and not interrupted_by_signal){
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an_error_occured = true;
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an_error_occured = true;
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if(interrupted_by_signal){
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written += (size_t)sret;
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}while(written < buf_len);
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if(not interrupted_by_signal and not an_error_occured){
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if(interrupted_by_signal or an_error_occured){
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written += (size_t)sret;
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if(not interrupted_by_signal and not an_error_occured){
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kill(usplash_pid, SIGTERM);
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/* If we got here, an error or interrupt must have happened */
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int cmdline_argc = 0;
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char **cmdline_argv = malloc(sizeof(char *));
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/* Create argv and argc for new usplash*/
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ptrdiff_t position = 0;
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while((size_t)position < cmdline_len){
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while(position < cmdline_len){
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char **tmp = realloc(cmdline_argv,
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(sizeof(char *) * (size_t)(cmdline_argc + 2)));
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* (size_t)(cmdline_argc + 2)));
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perror("realloc");
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free(cmdline_argv);
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cmdline_argv = tmp;
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cmdline_argv[cmdline_argc] = cmdline + position;
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position = (char *)rawmemchr(cmdline + position, '\0')
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position += strlen(cmdline + position) + 1;
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cmdline_argv[cmdline_argc] = NULL;
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/* Kill old usplash */
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kill(usplash_pid, SIGTERM);
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while(kill(usplash_pid, 0) == 0){
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kill(usplash_pid, SIGKILL);
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pid_t new_usplash_pid = fork();
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if(new_usplash_pid == 0){
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/* Child; will become new usplash process */
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while(kill(usplash_pid, 0)){
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kill(usplash_pid, SIGKILL);
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/* Make the effective user ID (root) the only user ID instead of
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the real user ID (mandos) */
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ret = setuid(geteuid());
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/* if(fork() != 0){ */
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/* _exit(EXIT_SUCCESS); */
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ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
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_exit(EXIT_FAILURE);
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execv("/sbin/usplash", cmdline_argv);
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execv(usplash_name, cmdline_argv);
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if(not usplash_write("PULSATE", NULL)
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and (errno != EINTR)){
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perror("usplash_write");
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return EXIT_FAILURE;