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* Askpass-FIFO - Read a password from a FIFO and output it
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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* Copyright © 2008-2011 Teddy Hogeborn
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* Copyright © 2008-2011 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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#include <sys/types.h> /* ssize_t */
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#include <sys/stat.h> /* mkfifo(), S_IRUSR, S_IWUSR */
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#include <iso646.h> /* and */
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#include <errno.h> /* errno, EEXIST */
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#include <stdio.h> /* perror() */
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#include <errno.h> /* errno, EACCES, ENOTDIR, ELOOP,
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ENAMETOOLONG, ENOSPC, EROFS,
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ENOENT, EEXIST, EFAULT, EMFILE,
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ENFILE, ENOMEM, EBADF, EINVAL, EIO,
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#include <error.h> /* error() */
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#include <stdlib.h> /* EXIT_FAILURE, NULL, size_t, free(),
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realloc(), EXIT_SUCCESS */
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#include <fcntl.h> /* open(), O_RDONLY */
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#include <unistd.h> /* read(), close(), write(),
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#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
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EX_UNAVAILABLE, EX_IOERR */
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int main(__attribute__((unused))int argc,
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const char passfifo[] = "/lib/cryptsetup/passfifo";
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ret = mkfifo(passfifo, S_IRUSR | S_IWUSR);
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if(ret == -1 and errno != EEXIST){
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error(EX_OSFILE, errno, "mkfifo");
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error(EX_OSERR, errno, "mkfifo");
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/* no "/lib/cryptsetup"? */
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error(EX_UNAVAILABLE, errno, "mkfifo");
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break; /* not an error */
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int fifo_fd = open(passfifo, O_RDONLY);
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error(0, errno, "open");
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return EX_UNAVAILABLE;
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/* Read from FIFO */
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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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error(0, errno, "realloc");
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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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error(0, errno, "read");
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return EX_UNAVAILABLE;
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buf_len += (size_t)sret;
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} while(sret != 0);
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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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error(0, errno, "write");
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written += (size_t)sret;
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ret = close(STDOUT_FILENO);
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error(0, errno, "close");
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return EXIT_SUCCESS;