stun

commit 7eec2a3e369947ad1f1b4f256b73b2977ea84726
parent 9422f660b059aed3f68ceb1729c79a1c07e69e34
Author: sin <sin@2f30.org>
Date:   Tue, 29 Mar 2016 10:37:41 +0100

some comments

Diffstat:
M
stun.c
 | 
4
++++

1 file changed, 4 insertions(+), 0 deletions(-)
diff --git a/stun.c b/stun.c
@@ -415,11 +415,15 @@ writenet(int fd, unsigned char *buf, int len)
 {
 	unsigned char encbuf[MTU + AES_BLOCK_SIZE + HDRLEN];
 
+	/* fill padding with random bytes */
 	if (padlen(len, AES_BLOCK_SIZE) > 0)
 		arc4random_buf(&encbuf[HDRLEN + len],
 	                       padlen(len, AES_BLOCK_SIZE));
+
 	aesenc(&enc, &encbuf[HDRLEN], buf, padto(len, AES_BLOCK_SIZE));
+	/* insert unpadded payload len at the start of the packet */
 	pack16(encbuf, len);
+	/* calculate total size of packet and send it on the wire */
 	len = padto(len, AES_BLOCK_SIZE) + HDRLEN;
 	return writeall(fd, encbuf, len);
 }