stun

commit 6659ab0293db6f8953ef25fc6bdc123c1569a412
parent c57cbb84aa431bd3d376ed70a6b096bd0de97357
Author: sin <sin@2f30.org>
Date:   Fri,  8 Apr 2016 15:48:39 +0100

use a null entry to terminate ciphers table

Diffstat:
M
stun.c
 | 
23
++++++++++-------------

1 file changed, 10 insertions(+), 13 deletions(-)
diff --git a/stun.c b/stun.c
@@ -85,8 +85,6 @@
 #define explicit_bzero bzero
 #endif
 
-#define LEN(x) (sizeof (x) / sizeof *(x))
-
 #define NOPRIVUSER      "nobody"
 #define RCVTIMEO        250 /* in milliseconds */
 #define RECONNECTTIMEO  60  /* in seconds */
@@ -646,27 +644,26 @@ err:
 }
 
 void
-aead_from_name(const EVP_AEAD **aead, const char *name)
+mapaead(const EVP_AEAD **aead, const char *name)
 {
-	size_t i;
 	struct {
 		const char *name;
 		const EVP_AEAD *(*aeadfn)(void);
-	} ciphers[] = {
+	} *cp, ciphers[] = {
 		{ "aes-128-gcm", EVP_aead_aes_128_gcm },
 		{ "aes-256-gcm", EVP_aead_aes_256_gcm },
 		{ "chacha20-poly1305", EVP_aead_chacha20_poly1305 },
-		{ "chacha20-poly1305-ietf", EVP_aead_chacha20_poly1305_ietf }
+		{ "chacha20-poly1305-ietf", EVP_aead_chacha20_poly1305_ietf },
+		{ NULL, NULL }
 	};
 
-	for (i = 0; i < LEN(ciphers); i++) {
-		if (!strcmp(ciphers[i].name, name)) {
-			*aead = (*ciphers[i].aeadfn)();
-			break;
+	for (cp = ciphers; cp->name; cp++) {
+		if (!strcmp(cp->name, name)) {
+			*aead = (*cp->aeadfn)();
+			return;
 		}
 	}
-	if (i == LEN(ciphers))
-		logerr("unknown cipher: %s", name);
+	logerr("unknown cipher: %s", name);
 }
 
 void
@@ -674,7 +671,7 @@ aeadinit(unsigned char *pw)
 {
 	size_t keylen;
 
-	aead_from_name(&aead, cipher);
+	mapaead(&aead, cipher);
 	keylen = EVP_AEAD_key_length(aead);
 	if (!PKCS5_PBKDF2_HMAC_SHA1(pw, strlen(pw), NULL, 0, NROUNDS,
 		                    keylen, key))