renamed capwap directory to cw.

FossilOrigin-Name: 8a43dd9d05a4cb73210243ddd8df2a26f16c7ef2c4d4e36ab446de1f65d88223

src/cw/cw_rand.c

@@ -0,0 +1,81 @@
+/*
+    This file is part of libcapwap.
+
+    libcapwap is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    libcapwap is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "cw_util.h"
+#include "log.h"
+
+char *cw_rand_dev = "/dev/random";
+
+int cw_rand_r(uint8_t * dst, int len)
+{
+	int rf;
+	int l;
+
+	rf = open(cw_rand_dev, O_RDONLY | O_NDELAY);
+	if (rf < 0) {
+
+		cw_log(LOG_ERR, "Can't open %s: %s", cw_rand_dev, strerror(errno));
+		return 0;
+	}
+
+
+	l = read(rf, dst, len);
+	close(rf);
+
+	if ((l < 0) && (errno != EAGAIN)) {
+		cw_log(LOG_ERR, "Cant read from %s: %s", cw_rand_dev, strerror(errno));
+		return 0;
+	}
+
+	return l;
+}
+
+
+
+int cw_rand(uint8_t * dst, int len)
+{
+	static uint32_t rinit = 0;
+	if (!rinit) {
+
+		int l = cw_rand_r((uint8_t *) (&rinit), sizeof(uint32_t));
+		if (l < sizeof(uint32_t)) {
+			cw_log(LOG_WARNING,
+			       "Can't read enough bytes from %s. Using time to init rand instead.",
+			       cw_rand_dev);
+			rinit = time(NULL);
+		}
+
+		srand(rinit);
+	}
+	int i;
+	for (i = 0; i < len; i++) {
+		dst[i] = rand();
+	}
+	return len;
+}