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+/*
+ * Copyright (c) 2006 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+RCSID("$Id: rand-unix.c,v 1.2 2006/10/21 21:09:14 lha Exp $");
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <rand.h>
+
+#include <roken.h>
+
+/*
+ * Unix /dev/random
+ */
+
+static int
+get_device_fd(int flags)
+{
+ static const char *rnd_devices[] = {
+ "/dev/urandom",
+ "/dev/random",
+ "/dev/srandom",
+ "/dev/arandom",
+ NULL
+ };
+ const char **p;
+
+ for(p = rnd_devices; *p; p++) {
+ int fd = open(*p, flags | O_NDELAY);
+ if(fd >= 0)
+ return fd;
+ }
+ return -1;
+}
+
+static void
+unix_seed(const void *indata, int size)
+{
+ int fd;
+
+ if (size <= 0)
+ return;
+
+ fd = get_device_fd(O_WRONLY);
+ if (fd < 0)
+ return;
+
+ write(fd, indata, size);
+ close(fd);
+
+}
+
+static int
+unix_bytes(unsigned char *outdata, int size)
+{
+ ssize_t count;
+ int fd;
+
+ if (size <= 0)
+ return 0;
+
+ fd = get_device_fd(O_RDONLY);
+ if (fd < 0)
+ return 0;
+
+ while (size > 0) {
+ count = read (fd, outdata, size);
+ if (count < 0 && errno == EINTR)
+ continue;
+ else if (count <= 0) {
+ close(fd);
+ return 0;
+ }
+ outdata += count;
+ size -= count;
+ }
+ close(fd);
+
+ return 1;
+}
+
+static void
+unix_cleanup(void)
+{
+}
+
+static void
+unix_add(const void *indata, int size, double entropi)
+{
+ unix_seed(indata, size);
+}
+
+static int
+unix_pseudorand(unsigned char *outdata, int size)
+{
+ return unix_bytes(outdata, size);
+}
+
+static int
+unix_status(void)
+{
+ int fd;
+
+ fd = get_device_fd(O_RDONLY);
+ if (fd < 0)
+ return 0;
+ close(fd);
+
+ return 1;
+}
+
+const RAND_METHOD hc_rand_unix_method = {
+ unix_seed,
+ unix_bytes,
+ unix_cleanup,
+ unix_add,
+ unix_pseudorand,
+ unix_status
+};