1
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
2
#include <sys/types.h> /* ssize_t */
3
#include <sys/stat.h> /* mkfifo(), S_IRUSR, S_IWUSR */
4
#include <iso646.h> /* and */
5
#include <errno.h> /* errno, EEXIST */
6
#include <stdio.h> /* perror() */
7
#include <stdlib.h> /* EXIT_FAILURE, NULL, size_t, free(),
8
realloc(), EXIT_SUCCESS */
9
#include <fcntl.h> /* open(), O_RDONLY */
10
#include <unistd.h> /* read(), close(), write(),
14
int main(__attribute__((unused))int argc,
15
__attribute__((unused))char **argv){
20
const char passfifo[] = "/lib/cryptsetup/passfifo";
21
ret = TEMP_FAILURE_RETRY(mkfifo(passfifo, S_IRUSR | S_IWUSR));
22
if(ret == -1 and errno != EEXIST){
28
int fifo_fd = TEMP_FAILURE_RETRY(open(passfifo, O_RDONLY));
38
size_t buf_allocated = 0;
39
const size_t blocksize = 1024;
41
if(buf_len + blocksize > buf_allocated){
42
char *tmp = realloc(buf, buf_allocated + blocksize);
49
buf_allocated += blocksize;
51
sret = TEMP_FAILURE_RETRY(read(fifo_fd, buf + buf_len,
52
buf_allocated - buf_len));
58
buf_len += (size_t)sret;
63
TEMP_FAILURE_RETRY(close(fifo_fd));
65
/* Print password to stdout */
67
while(written < buf_len){
68
sret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buf + written,
75
written += (size_t)sret;