diff options
Diffstat (limited to 'src/random.c')
-rw-r--r-- | src/random.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/random.c b/src/random.c new file mode 100644 index 0000000..0681d77 --- /dev/null +++ b/src/random.c @@ -0,0 +1,61 @@ +/* + Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net> + Partly based on QuickTun Copyright (c) 2010, Ivo Smits <Ivo@UCIS.nl>. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + + +#include "fastd.h" + +#include <fcntl.h> +#include <sys/stat.h> +#include <unistd.h> + + +void fastd_random_bytes(fastd_context *ctx, void *buffer, size_t len, bool secure) { + int fd; + size_t read_bytes = 0; + + if (secure) + fd = open("/dev/random", O_RDONLY); + else + fd = open("/dev/urandom", O_RDONLY); + + if (fd < 0) + exit_errno(ctx, "unable to open random device"); + + while (read_bytes < len) { + ssize_t ret = read(fd, ((char*)buffer)+read_bytes, len-read_bytes); + + if (ret < 0) { + if (errno == EINTR) + continue; + + exit_errno(ctx, "unable to read from random device"); + } + + read_bytes += ret; + } + + close(fd); +} |