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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
static const size_t maxTries = 5;
int main(int argc, char **argv) {
struct termios old, new;
int passfifo_fd = open("/lib/cryptsetup/passfifo", O_WRONLY);
if (passfifo_fd < 0) {
perror("open");
return -1;
}
if ( tcgetattr(0, &old) != 0 )
return -1;
new = old;
new.c_lflag &= ~ECHO;
if ( tcsetattr(0, TCSANOW, &new) != 0 )
return -1;
size_t tries = 0;
while (tries++ < maxTries) {
printf("[%u/%u] Enter a passphrase: ", (unsigned int)tries, (unsigned int)maxTries);
char *line = calloc(128, sizeof(char));
size_t len = 128;
ssize_t read = getline(&line, &len, stdin);
if (write(passfifo_fd, line, len) == -1)
perror("write");
printf("\n");
sleep(3);
}
if ( tcsetattr(0, TCSANOW, &old) != 0 )
return -1;
return 0;
}
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