stun

commit f9ffd6a6462f24e68c9fa0ed90011cacd338faf0
parent dc9b14d9875bef6247ce8e125ca1bac67c206029
Author: sin <sin@2f30.org>
Date:   Wed,  6 Apr 2016 14:16:44 +0100

use a table

Diffstat:
M
stun.c
 | 
47
++++++++++++++++++++---------------------------

1 file changed, 20 insertions(+), 27 deletions(-)
diff --git a/stun.c b/stun.c
@@ -74,6 +74,8 @@
 #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 */
@@ -650,35 +652,26 @@ err:
 void
 aead_from_name(const EVP_AEAD **aead, const char *name)
 {
-	*aead = NULL;
+	size_t i;
+	struct {
+		const char *name;
+		const EVP_AEAD *(*aeadfn)(void);
+	} 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 }
+	};
 
-	if (!strcmp(name, "aes-128-gcm")) {
-#ifndef OPENSSL_NO_AES
-		*aead = EVP_aead_aes_128_gcm();
-#else
-		logerr("No AES support");
-#endif
-	} else if (!strcmp(name, "aes-256-gcm")) {
-#ifndef OPENSSL_NO_AES
-		*aead = EVP_aead_aes_256_gcm();
-#else
-		logerr("No AES support");
-#endif
-	} else if (!strcmp(name, "chacha20-poly1305")) {
-#if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
-		*aead = EVP_aead_chacha20_poly1305();
-#else
-		logerr("No chacha20-poly1305 support");
-#endif
-	} else if (!strcmp(name, "chacha20-poly1305-ietf")) {
-#if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
-		*aead = EVP_aead_chacha20_poly1305_ietf();
-#else
-		logerr("No chacha20-poly1305-ietf support");
-#endif
-	} else {
-		logerr("Unknown AEAD: %s", name);
+	*aead = NULL;
+	for (i = 0; i < LEN(ciphers); i++) {
+		if (!strcmp(ciphers[i].name, name)) {
+			*aead = (*ciphers[i].aeadfn)();
+			break;
+		}
 	}
+	if (i == LEN(ciphers))
+		logerr("unknown cipher: %s", name);
 }
 
 void