Initial commit

FossilOrigin-Name: c53d95729c009f8f80a7d63847cef7668ff73f8af0523ab65f7734696f85399c

src/capwap/cw_rand.c

@@ -0,0 +1,61 @@
+/*
+    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 <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 "cw_log.h"
+
+char * cw_rand_dev = "/dev/random";
+
+int cw_rand(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 cw_pseudo_rand(dst,len);
+	}
+
+
+	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 cw_pseudo_rand(dst,len);
+	}
+
+	if (l<len){
+		cw_log_debug2("Not enough entropy reading from %s, using pseudo rand",cw_rand_dev);
+		return cw_pseudo_rand(dst,len);
+	}
+	
+	return l;
+}