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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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#include <stddef.h> /* NULL */
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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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static void termination_handler(__attribute__((unused))int signum){
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interrupted_by_signal = 1;
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int main(__attribute__((unused))int argc,
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__attribute__((unused))char **argv){
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bool an_error_occured = false;
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/* Create prompt string */
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const char *const cryptsource = getenv("cryptsource");
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const char *const crypttarget = getenv("crypttarget");
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const char *const prompt_start = "Enter passphrase to unlock the disk";
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if(cryptsource == NULL){
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if(crypttarget == NULL){
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ret = asprintf(&prompt, "%s: ", prompt_start);
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ret = asprintf(&prompt, "%s (%s): ", prompt_start,
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if(crypttarget == NULL){
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ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
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ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
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cryptsource, crypttarget);
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/* Find usplash process */
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pid_t usplash_pid = 0;
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size_t cmdline_len = 0;
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const char usplash_name[] = "/sbin/usplash";
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DIR *proc_dir = opendir("/proc");
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for(struct dirent *proc_ent = readdir(proc_dir);
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proc_ent = readdir(proc_dir)){
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pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
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/* Find the executable name by doing readlink() on the
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/proc/<pid>/exe link */
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char exe_target[sizeof(usplash_name)];
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ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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sret = readlink(exe_link, exe_target, sizeof(exe_target));
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if((sret == ((ssize_t)sizeof(exe_target)-1))
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and (memcmp(usplash_name, exe_target,
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sizeof(exe_target)-1) == 0)){
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/* Read and save the command line of usplash in "cmdline" */
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/* Open /proc/<pid>/cmdline */
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char *cmdline_filename;
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ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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cl_fd = open(cmdline_filename, O_RDONLY);
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free(cmdline_filename);
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free(cmdline_filename);
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size_t cmdline_allocated = 0;
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const size_t blocksize = 1024;
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if(cmdline_len + blocksize > cmdline_allocated){
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tmp = realloc(cmdline, cmdline_allocated + blocksize);
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cmdline_allocated += blocksize;
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sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
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cmdline_len += (size_t)sret;
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if(usplash_pid == 0){
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/* Set up the signal handler */
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struct sigaction old_action,
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new_action = { .sa_handler = termination_handler,
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sigemptyset(&new_action.sa_mask);
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sigaddset(&new_action.sa_mask, SIGINT);
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sigaddset(&new_action.sa_mask, SIGHUP);
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sigaddset(&new_action.sa_mask, SIGTERM);
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ret = sigaction(SIGINT, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGINT, &new_action, NULL);
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ret = sigaction(SIGHUP, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGHUP, &new_action, NULL);
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ret = sigaction(SIGTERM, NULL, &old_action);
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGTERM, &new_action, NULL);
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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 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 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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buf_len += (size_t)sret;
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}while(not interrupted_by_signal and sret != 0);
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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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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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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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kill(usplash_pid, SIGTERM);
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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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char **tmp = realloc(cmdline_argv,
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(sizeof(char *) * (size_t)(cmdline_argc + 2)));
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cmdline_argv[cmdline_argc] = cmdline + position;
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position = (char *)rawmemchr(cmdline + position, '\0')
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cmdline_argv[cmdline_argc] = NULL;
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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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ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
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execv("/sbin/usplash", cmdline_argv);
added
removed
plugins.d/usplash.c
