/mandos/trunk : contents of plugins.d/usplash.c at revision 210

: (revision 210)

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#define _GNU_SOURCE		/* asprintf() */
#include <signal.h>		/* sig_atomic_t, struct sigaction,
				   sigemptyset(), sigaddset(),
				   sigaction, SIGINT, SIG_IGN, SIGHUP,
				   SIGTERM, kill(), SIGKILL */
#include <stddef.h>		/* NULL */
#include <stdlib.h>		/* getenv() */
#include <stdio.h>		/* asprintf(), perror() */
#include <stdlib.h>		/* EXIT_FAILURE, EXIT_SUCCESS,
				   strtoul(), free() */
#include <sys/types.h>		/* pid_t, DIR, struct dirent,
				   ssize_t */
#include <dirent.h>		/* opendir(), readdir(), closedir() */
#include <unistd.h>		/* readlink(), fork(), execl(),
				   _exit */
#include <string.h>		/* memcmp() */
#include <iso646.h>		/* and */
#include <stdbool.h>		/* bool, false, true */
#include <errno.h>		/* errno */
#include <sys/wait.h>		/* waitpid(), WIFEXITED(),
				   WEXITSTATUS() */
#include <fcntl.h>		/* open(), O_RDONLY */

sig_atomic_t interrupted_by_signal = 0;

static void termination_handler(__attribute__((unused))int signum){
  interrupted_by_signal = 1;
}

static bool usplash_write(const char *cmd, const char *arg){
  /* 
   * usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
   * usplash_write("PULSATE", NULL); -> "PULSATE\0"
   * SEE ALSO
   *         usplash_write(8)
   */
  int ret;
  int fifo_fd;
  do{
    fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
    if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
      return false;
    }
  }while(fifo_fd == -1);
  
  const char *cmd_line;
  char *cmd_line_alloc = NULL;
  if(arg == NULL){
    cmd_line = cmd;
    ret = (int)strlen(cmd);
  }else{
    do{
      ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
      if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
	int e = errno;
	close(fifo_fd);
	errno = e;
	return false;
      }
    }while(ret == -1);
    cmd_line = cmd_line_alloc;
  }
  
  size_t cmd_line_len = (size_t)ret + 1;
  size_t written = 0;
  while(not interrupted_by_signal and written < cmd_line_len){
    ret = write(fifo_fd, cmd_line + written,
		cmd_line_len - written);
    if(ret == -1){
      if(errno != EINTR or interrupted_by_signal){
	int e = errno;
	close(fifo_fd);
	free(cmd_line_alloc);
	errno = e;
	return false;
      } else {
	continue;
      }
    }
    written += (size_t)ret;
  }
  free(cmd_line_alloc);
  do{
    ret = close(fifo_fd);
    if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
      return false;
    }
  }while(ret == -1);
  if(interrupted_by_signal){
    return false;
  }
  return true;
}

int main(__attribute__((unused))int argc,
	 __attribute__((unused))char **argv){
  int ret = 0;
  ssize_t sret;
  bool an_error_occured = false;
  
  /* Create prompt string */
  char *prompt = NULL;
  {
    const char *const cryptsource = getenv("cryptsource");
    const char *const crypttarget = getenv("crypttarget");
    const char *const prompt_start = "Enter passphrase to unlock the disk";
    
    if(cryptsource == NULL){
      if(crypttarget == NULL){
	ret = asprintf(&prompt, "%s: ", prompt_start);
      } else {
	ret = asprintf(&prompt, "%s (%s): ", prompt_start,
		       crypttarget);
      }
    } else {
      if(crypttarget == NULL){
	ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
      } else {
	ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
		       cryptsource, crypttarget);
      }
    }
    if(ret == -1){
      return EXIT_FAILURE;
    }
  }
  
  /* Find usplash process */
  pid_t usplash_pid = 0;
  char *cmdline = NULL;
  size_t cmdline_len = 0;
  const char usplash_name[] = "/sbin/usplash";
  {
    DIR *proc_dir = opendir("/proc");
    if(proc_dir == NULL){
      free(prompt);
      perror("opendir");
      return EXIT_FAILURE;
    }
    for(struct dirent *proc_ent = readdir(proc_dir);
	proc_ent != NULL;
	proc_ent = readdir(proc_dir)){
      pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
      if(pid == 0){
	/* Not a process */
	continue;
      }
      /* Find the executable name by doing readlink() on the
	 /proc/<pid>/exe link */
      char exe_target[sizeof(usplash_name)];
      {
	char *exe_link;
	ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
	if(ret == -1){
	  perror("asprintf");
	  free(prompt);
	  closedir(proc_dir);
	  return EXIT_FAILURE;
	}
	sret = readlink(exe_link, exe_target, sizeof(exe_target));
	free(exe_link);
      }
      if((sret == ((ssize_t)sizeof(exe_target)-1))
	 and (memcmp(usplash_name, exe_target,
		     sizeof(exe_target)-1) == 0)){
	usplash_pid = pid;
	/* Read and save the command line of usplash in "cmdline" */
	{
	  /* Open /proc/<pid>/cmdline  */
	  int cl_fd;
	  {
	    char *cmdline_filename;
	    ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
			   proc_ent->d_name);
	    if(ret == -1){
	      perror("asprintf");
	      free(prompt);
	      closedir(proc_dir);
	      return EXIT_FAILURE;
	    }
	    cl_fd = open(cmdline_filename, O_RDONLY);
	    if(cl_fd == -1){
	      perror("open");
	      free(cmdline_filename);
	      free(prompt);
	      closedir(proc_dir);
	      return EXIT_FAILURE;
	    }
	    free(cmdline_filename);
	  }
	  size_t cmdline_allocated = 0;
	  char *tmp;
	  const size_t blocksize = 1024;
	  do{
	    if(cmdline_len + blocksize > cmdline_allocated){
	      tmp = realloc(cmdline, cmdline_allocated + blocksize);
	      if(tmp == NULL){
		perror("realloc");
		free(cmdline);
		free(prompt);
		closedir(proc_dir);
		return EXIT_FAILURE;
	      }
	      cmdline = tmp;
	      cmdline_allocated += blocksize;
	    }
	    sret = read(cl_fd, cmdline + cmdline_len,
			cmdline_allocated - cmdline_len);
	    if(sret == -1){
	      perror("read");
	      free(cmdline);
	      free(prompt);
	      closedir(proc_dir);
	      return EXIT_FAILURE;
	    }
	    cmdline_len += (size_t)sret;
	  } while(sret != 0);
	  close(cl_fd);
	}
	break;
      }
    }
    closedir(proc_dir);
  }
  if(usplash_pid == 0){
    free(prompt);
    return EXIT_FAILURE;
  }
  
  /* Set up the signal handler */
  {
    struct sigaction old_action,
      new_action = { .sa_handler = termination_handler,
		     .sa_flags = 0 };
    sigemptyset(&new_action.sa_mask);
    sigaddset(&new_action.sa_mask, SIGINT);
    sigaddset(&new_action.sa_mask, SIGHUP);
    sigaddset(&new_action.sa_mask, SIGTERM);
    ret = sigaction(SIGINT, NULL, &old_action);
    if(ret == -1){
      perror("sigaction");
      free(prompt);
      return EXIT_FAILURE;
    }
    if (old_action.sa_handler != SIG_IGN){
      ret = sigaction(SIGINT, &new_action, NULL);
      if(ret == -1){
	perror("sigaction");
	free(prompt);
	return EXIT_FAILURE;
      }
    }
    ret = sigaction(SIGHUP, NULL, &old_action);
    if(ret == -1){
      perror("sigaction");
      free(prompt);
      return EXIT_FAILURE;
    }
    if (old_action.sa_handler != SIG_IGN){
      ret = sigaction(SIGHUP, &new_action, NULL);
      if(ret == -1){
	perror("sigaction");
	free(prompt);
	return EXIT_FAILURE;
      }
    }
    ret = sigaction(SIGTERM, NULL, &old_action);
    if(ret == -1){
      perror("sigaction");
      free(prompt);
      return EXIT_FAILURE;
    }
    if (old_action.sa_handler != SIG_IGN){
      ret = sigaction(SIGTERM, &new_action, NULL);
      if(ret == -1){
	perror("sigaction");
	free(prompt);
	return EXIT_FAILURE;
      }
    }
  }
  
  /* Write command to FIFO */
  if(not interrupted_by_signal){
    if(not usplash_write("TIMEOUT", "0")
       and (errno != EINTR)){
      perror("usplash_write");
      an_error_occured = true;
    }
  }
  if(not interrupted_by_signal and not an_error_occured){
    if(not usplash_write("INPUTQUIET", prompt)
       and (errno != EINTR)){
      perror("usplash_write");
      an_error_occured = true;
    }
  }
  free(prompt);
  
  /* This is not really a loop; while() is used to be able to "break"
     out of it; those breaks are marked "Big" */
  while(not interrupted_by_signal and not an_error_occured){
    char *buf = NULL;
    size_t buf_len = 0;
    
    /* Open FIFO */
    int fifo_fd;
    do{
      fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
      if(fifo_fd == -1){
	if(errno != EINTR){
	  perror("open");
	  an_error_occured = true;
	  break;
	}
	if(interrupted_by_signal){
	  break;
	}
      }
    }while(fifo_fd == -1);
    if(interrupted_by_signal or an_error_occured){
      break;			/* Big */
    }
    
    /* Read from FIFO */
    size_t buf_allocated = 0;
    const size_t blocksize = 1024;
    do{
      if(buf_len + blocksize > buf_allocated){
	char *tmp = realloc(buf, buf_allocated + blocksize);
	if(tmp == NULL){
	  perror("realloc");
	  an_error_occured = true;
	  break;
	}
	buf = tmp;
	buf_allocated += blocksize;
      }
      do{
	sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
	if(sret == -1){
	  if(errno != EINTR){
	    perror("read");
	    an_error_occured = true;
	    break;
	  }
	  if(interrupted_by_signal){
	    break;
	  }
	}
      }while(sret == -1);
      if(interrupted_by_signal or an_error_occured){
	break;
      }
      
      buf_len += (size_t)sret;
    }while(sret != 0);
    close(fifo_fd);
    if(interrupted_by_signal or an_error_occured){
      break;			/* Big */
    }
    
    if(not usplash_write("TIMEOUT", "15")
       and (errno != EINTR)){
	perror("usplash_write");
	an_error_occured = true;
    }
    if(interrupted_by_signal or an_error_occured){
      break;			/* Big */
    }
    
    /* Print password to stdout */
    size_t written = 0;
    do{
      do{
	sret = write(STDOUT_FILENO, buf + written, buf_len - written);
	if(sret == -1){
	  if(errno != EINTR){
	    perror("write");
	    an_error_occured = true;
	    break;
	  }
	  if(interrupted_by_signal){
	    break;
	  }
	}
      }while(sret == -1);
      if(interrupted_by_signal or an_error_occured){
	break;
      }
      
      written += (size_t)sret;
    }while(written < buf_len);
    if(not interrupted_by_signal and not an_error_occured){
      return EXIT_SUCCESS;
    }
    break;			/* Big */
  }
  
  /* If we got here, an error or interrupt must have happened */
  
  int cmdline_argc = 0;
  char **cmdline_argv = malloc(sizeof(char *));
  /* Create argv and argc for new usplash*/
  {
    size_t position = 0;
    while(position < cmdline_len){
      char **tmp = realloc(cmdline_argv,
			   (sizeof(char *) * (size_t)(cmdline_argc + 2)));
      if(tmp == NULL){
	perror("realloc");
	free(cmdline_argv);
	return EXIT_FAILURE;
      }
      cmdline_argv = tmp;
      cmdline_argv[cmdline_argc] = cmdline + position;
      cmdline_argc++;
      position += strlen(cmdline + position) + 1;
    }
    cmdline_argv[cmdline_argc] = NULL;
  }
  /* Kill old usplash */
    kill(usplash_pid, SIGTERM);
    sleep(2);
  while(kill(usplash_pid, 0) == 0){
    kill(usplash_pid, SIGKILL);
    sleep(1);
  }
  pid_t new_usplash_pid = fork();
  if(new_usplash_pid == 0){
    /* Child; will become new usplash process */
    
    /* Make the effective user ID (root) the only user ID instead of
       the real user ID (mandos) */
    ret = setuid(geteuid());
    if (ret == -1){
      perror("setuid");
    }
    
    setsid();
    ret = chdir("/");
/*     if(fork() != 0){ */
/*       _exit(EXIT_SUCCESS); */
/*     } */
    ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
    if(ret == -1){
      perror("dup2");
      _exit(EXIT_FAILURE);
    }
    
    execv(usplash_name, cmdline_argv);
  }
  sleep(2);
  if(not usplash_write("PULSATE", NULL)
     and (errno != EINTR)){
    perror("usplash_write");
  }
  
  return EXIT_FAILURE;
}

208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	1	#define _GNU_SOURCE /* asprintf() */
	2	#include <signal.h> /* sig_atomic_t, struct sigaction,
	3	sigemptyset(), sigaddset(),
	4	sigaction, SIGINT, SIG_IGN, SIGHUP,
	5	SIGTERM, kill(), SIGKILL */
	6	#include <stddef.h> /* NULL */
	7	#include <stdlib.h> /* getenv() */
	8	#include <stdio.h> /* asprintf(), perror() */
	9	#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS,
	10	strtoul(), free() */
	11	#include <sys/types.h> /* pid_t, DIR, struct dirent,
	12	ssize_t */
	13	#include <dirent.h> /* opendir(), readdir(), closedir() */
	14	#include <unistd.h> /* readlink(), fork(), execl(),
	15	_exit */
	16	#include <string.h> /* memcmp() */
	17	#include <iso646.h> /* and */
	18	#include <stdbool.h> /* bool, false, true */
	19	#include <errno.h> /* errno */
	20	#include <sys/wait.h> /* waitpid(), WIFEXITED(),
	21	WEXITSTATUS() */
	22	#include <fcntl.h> /* open(), O_RDONLY */
	23
	24	sig_atomic_t interrupted_by_signal = 0;
	25
	26	static void termination_handler(__attribute__((unused))int signum){
	27	interrupted_by_signal = 1;
	28	}
	29
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	30	static bool usplash_write(const char cmd, const char arg){
	31	/*
	32	* usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
	33	* usplash_write("PULSATE", NULL); -> "PULSATE\0"
	34	* SEE ALSO
	35	* usplash_write(8)
	36	*/
	37	int ret;
	38	int fifo_fd;
	39	do{
	40	fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
	41	if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
	42	return false;
	43	}
	44	}while(fifo_fd == -1);
	45
	46	const char *cmd_line;
	47	char *cmd_line_alloc = NULL;
	48	if(arg == NULL){
	49	cmd_line = cmd;
	50	ret = (int)strlen(cmd);
	51	}else{
	52	do{
	53	ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
	54	if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
	55	int e = errno;
	56	close(fifo_fd);
	57	errno = e;
	58	return false;
	59	}
	60	}while(ret == -1);
	61	cmd_line = cmd_line_alloc;
	62	}
	63
	64	size_t cmd_line_len = (size_t)ret + 1;
	65	size_t written = 0;
	66	while(not interrupted_by_signal and written < cmd_line_len){
	67	ret = write(fifo_fd, cmd_line + written,
	68	cmd_line_len - written);
	69	if(ret == -1){
	70	if(errno != EINTR or interrupted_by_signal){
	71	int e = errno;
	72	close(fifo_fd);
	73	free(cmd_line_alloc);
	74	errno = e;
	75	return false;
	76	} else {
	77	continue;
	78	}
	79	}
	80	written += (size_t)ret;
	81	}
	82	free(cmd_line_alloc);
	83	do{
	84	ret = close(fifo_fd);
	85	if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
	86	return false;
	87	}
	88	}while(ret == -1);
	89	if(interrupted_by_signal){
	90	return false;
	91	}
	92	return true;
	93	}
94
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	95	int main(__attribute__((unused))int argc,
	96	__attribute__((unused))char **argv){
	97	int ret = 0;
	98	ssize_t sret;
	99	bool an_error_occured = false;
	100
	101	/* Create prompt string */
	102	char *prompt = NULL;
	103	{
	104	const char *const cryptsource = getenv("cryptsource");
	105	const char *const crypttarget = getenv("crypttarget");
	106	const char *const prompt_start = "Enter passphrase to unlock the disk";
	107
	108	if(cryptsource == NULL){
	109	if(crypttarget == NULL){
	110	ret = asprintf(&prompt, "%s: ", prompt_start);
	111	} else {
	112	ret = asprintf(&prompt, "%s (%s): ", prompt_start,
	113	crypttarget);
	114	}
	115	} else {
	116	if(crypttarget == NULL){
	117	ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
	118	} else {
	119	ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
	120	cryptsource, crypttarget);
	121	}
	122	}
	123	if(ret == -1){
	124	return EXIT_FAILURE;
	125	}
	126	}
	127
	128	/* Find usplash process */
	129	pid_t usplash_pid = 0;
	130	char *cmdline = NULL;
	131	size_t cmdline_len = 0;
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	132	const char usplash_name[] = "/sbin/usplash";
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	133	{
	134	DIR *proc_dir = opendir("/proc");
	135	if(proc_dir == NULL){
	136	free(prompt);
	137	perror("opendir");
	138	return EXIT_FAILURE;
	139	}
	140	for(struct dirent *proc_ent = readdir(proc_dir);
	141	proc_ent != NULL;
	142	proc_ent = readdir(proc_dir)){
	143	pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
	144	if(pid == 0){
	145	/* Not a process */
	146	continue;
	147	}
	148	/* Find the executable name by doing readlink() on the
	149	/proc/<pid>/exe link */
	150	char exe_target[sizeof(usplash_name)];
	151	{
	152	char *exe_link;
	153	ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
	154	if(ret == -1){
	155	perror("asprintf");
	156	free(prompt);
	157	closedir(proc_dir);
	158	return EXIT_FAILURE;
	159	}
	160	sret = readlink(exe_link, exe_target, sizeof(exe_target));
	161	free(exe_link);
	162	}
	163	if((sret == ((ssize_t)sizeof(exe_target)-1))
	164	and (memcmp(usplash_name, exe_target,
	165	sizeof(exe_target)-1) == 0)){
	166	usplash_pid = pid;
	167	/* Read and save the command line of usplash in "cmdline" */
	168	{
	169	/* Open /proc/<pid>/cmdline */
	170	int cl_fd;
	171	{
	172	char *cmdline_filename;
	173	ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
	174	proc_ent->d_name);
	175	if(ret == -1){
	176	perror("asprintf");
	177	free(prompt);
	178	closedir(proc_dir);
	179	return EXIT_FAILURE;
	180	}
	181	cl_fd = open(cmdline_filename, O_RDONLY);
	182	if(cl_fd == -1){
	183	perror("open");
	184	free(cmdline_filename);
	185	free(prompt);
	186	closedir(proc_dir);
	187	return EXIT_FAILURE;
	188	}
	189	free(cmdline_filename);
	190	}
	191	size_t cmdline_allocated = 0;
	192	char *tmp;
	193	const size_t blocksize = 1024;
	194	do{
	195	if(cmdline_len + blocksize > cmdline_allocated){
	196	tmp = realloc(cmdline, cmdline_allocated + blocksize);
197	if(tmp == NULL){
198	perror("realloc");
199	free(cmdline);
200	free(prompt);
201	closedir(proc_dir);
202	return EXIT_FAILURE;
203	}
204	cmdline = tmp;
205	cmdline_allocated += blocksize;
206	}
207	sret = read(cl_fd, cmdline + cmdline_len,
208	cmdline_allocated - cmdline_len);
209	if(sret == -1){
210	perror("read");
211	free(cmdline);
212	free(prompt);
213	closedir(proc_dir);
214	return EXIT_FAILURE;
215	}
216	cmdline_len += (size_t)sret;
217	} while(sret != 0);
218	close(cl_fd);
219	}
220	break;
221	}
222	}
223	closedir(proc_dir);
224	}
225	if(usplash_pid == 0){
226	free(prompt);
227	return EXIT_FAILURE;
228	}
229
230	/* Set up the signal handler */
231	{
232	struct sigaction old_action,
233	new_action = { .sa_handler = termination_handler,
234	.sa_flags = 0 };
235	sigemptyset(&new_action.sa_mask);
236	sigaddset(&new_action.sa_mask, SIGINT);
237	sigaddset(&new_action.sa_mask, SIGHUP);
238	sigaddset(&new_action.sa_mask, SIGTERM);
239	ret = sigaction(SIGINT, NULL, &old_action);
240	if(ret == -1){
241	perror("sigaction");
242	free(prompt);
243	return EXIT_FAILURE;
244	}
245	if (old_action.sa_handler != SIG_IGN){
246	ret = sigaction(SIGINT, &new_action, NULL);
247	if(ret == -1){
248	perror("sigaction");
249	free(prompt);
250	return EXIT_FAILURE;
251	}
252	}
253	ret = sigaction(SIGHUP, NULL, &old_action);
254	if(ret == -1){
255	perror("sigaction");
256	free(prompt);
257	return EXIT_FAILURE;
258	}
259	if (old_action.sa_handler != SIG_IGN){
260	ret = sigaction(SIGHUP, &new_action, NULL);
261	if(ret == -1){
262	perror("sigaction");
263	free(prompt);
264	return EXIT_FAILURE;
265	}
266	}
267	ret = sigaction(SIGTERM, NULL, &old_action);
268	if(ret == -1){
269	perror("sigaction");
270	free(prompt);
271	return EXIT_FAILURE;
272	}
273	if (old_action.sa_handler != SIG_IGN){
274	ret = sigaction(SIGTERM, &new_action, NULL);
275	if(ret == -1){
276	perror("sigaction");
277	free(prompt);
278	return EXIT_FAILURE;
279	}
280	}
281	}
282
283	/* Write command to FIFO */
284	if(not interrupted_by_signal){
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	285	if(not usplash_write("TIMEOUT", "0")
	286	and (errno != EINTR)){
	287	perror("usplash_write");
	288	an_error_occured = true;
	289	}
	290	}
	291	if(not interrupted_by_signal and not an_error_occured){
	292	if(not usplash_write("INPUTQUIET", prompt)
	293	and (errno != EINTR)){
	294	perror("usplash_write");
	295	an_error_occured = true;
	296	}
	297	}
	298	free(prompt);
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	299
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	300	/* This is not really a loop; while() is used to be able to "break"
	301	out of it; those breaks are marked "Big" */
	302	while(not interrupted_by_signal and not an_error_occured){
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	303	char *buf = NULL;
	304	size_t buf_len = 0;
	305
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	306	/* Open FIFO */
	307	int fifo_fd;
	308	do{
	309	fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
	310	if(fifo_fd == -1){
	311	if(errno != EINTR){
	312	perror("open");
	313	an_error_occured = true;
	314	break;
	315	}
	316	if(interrupted_by_signal){
	317	break;
	318	}
	319	}
	320	}while(fifo_fd == -1);
	321	if(interrupted_by_signal or an_error_occured){
	322	break; /* Big */
	323	}
	324
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	325	/* Read from FIFO */
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	326	size_t buf_allocated = 0;
	327	const size_t blocksize = 1024;
	328	do{
	329	if(buf_len + blocksize > buf_allocated){
	330	char *tmp = realloc(buf, buf_allocated + blocksize);
	331	if(tmp == NULL){
	332	perror("realloc");
	333	an_error_occured = true;
	334	break;
	335	}
	336	buf = tmp;
	337	buf_allocated += blocksize;
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	338	}
	339	do{
	340	sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
	341	if(sret == -1){
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	342	if(errno != EINTR){
	343	perror("read");
	344	an_error_occured = true;
	345	break;
	346	}
	347	if(interrupted_by_signal){
	348	break;
	349	}
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	350	}
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	351	}while(sret == -1);
	352	if(interrupted_by_signal or an_error_occured){
	353	break;
	354	}
	355
	356	buf_len += (size_t)sret;
	357	}while(sret != 0);
	358	close(fifo_fd);
	359	if(interrupted_by_signal or an_error_occured){
	360	break; /* Big */
	361	}
	362
	363	if(not usplash_write("TIMEOUT", "15")
	364	and (errno != EINTR)){
	365	perror("usplash_write");
	366	an_error_occured = true;
	367	}
	368	if(interrupted_by_signal or an_error_occured){
	369	break; /* Big */
	370	}
	371
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	372	/* Print password to stdout */
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	373	size_t written = 0;
	374	do{
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	375	do{
	376	sret = write(STDOUT_FILENO, buf + written, buf_len - written);
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	377	if(sret == -1){
	378	if(errno != EINTR){
	379	perror("write");
	380	an_error_occured = true;
	381	break;
	382	}
	383	if(interrupted_by_signal){
	384	break;
	385	}
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	386	}
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	387	}while(sret == -1);
	388	if(interrupted_by_signal or an_error_occured){
	389	break;
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	390	}
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	391
	392	written += (size_t)sret;
	393	}while(written < buf_len);
	394	if(not interrupted_by_signal and not an_error_occured){
	395	return EXIT_SUCCESS;
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	396	}
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	397	break; /* Big */
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	398	}
	399
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	400	/* If we got here, an error or interrupt must have happened */
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	401
	402	int cmdline_argc = 0;
	403	char *cmdline_argv = malloc(sizeof(char ));
	404	/* Create argv and argc for new usplash*/
	405	{
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	406	size_t position = 0;
	407	while(position < cmdline_len){
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	408	char **tmp = realloc(cmdline_argv,
	409	(sizeof(char ) (size_t)(cmdline_argc + 2)));
	410	if(tmp == NULL){
	411	perror("realloc");
	412	free(cmdline_argv);
	413	return EXIT_FAILURE;
	414	}
	415	cmdline_argv = tmp;
	416	cmdline_argv[cmdline_argc] = cmdline + position;
	417	cmdline_argc++;
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	418	position += strlen(cmdline + position) + 1;
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	419	}
	420	cmdline_argv[cmdline_argc] = NULL;
	421	}
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	422	/* Kill old usplash */
	423	kill(usplash_pid, SIGTERM);
	424	sleep(2);
	425	while(kill(usplash_pid, 0) == 0){
	426	kill(usplash_pid, SIGKILL);
	427	sleep(1);
	428	}
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	429	pid_t new_usplash_pid = fork();
	430	if(new_usplash_pid == 0){
	431	/* Child; will become new usplash process */
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	432
	433	/* Make the effective user ID (root) the only user ID instead of
	434	the real user ID (mandos) */
	435	ret = setuid(geteuid());
	436	if (ret == -1){
	437	perror("setuid");
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	438	}
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	439
	440	setsid();
	441	ret = chdir("/");
	442	/* if(fork() != 0){ */
	443	/* _exit(EXIT_SUCCESS); */
	444	/* } */
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	445	ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
	446	if(ret == -1){
	447	perror("dup2");
	448	_exit(EXIT_FAILURE);
	449	}
210 by Teddy Hogeborn * debian/mandos-client.postinst: Change home directory to	450
	451	execv(usplash_name, cmdline_argv);
	452	}
	453	sleep(2);
	454	if(not usplash_write("PULSATE", NULL)
	455	and (errno != EINTR)){
	456	perror("usplash_write");
208 by Teddy Hogeborn * Makefile (PLUGINS): Added "plugins.d/usplash".	457	}
	458
	459	return EXIT_FAILURE;
	460	}