streams: openssl: move OpenSSL compat layer into implementation

OpenSSL version 1.1 has broken its API in quite a few ways. To avoid
having to use ifdef's everywhere, we have implemented the BIO functions
added in version 1.1 ourselves in case we are using the legacy API. We
were implementing them in the header file, though, which doesn't make a
lot of sense, since these functions are only ever being used the the
openssl stream implementation.

Move these functions to the implementation file and mark them static.

src/streams/openssl.c

@@ -38,6 +38,104 @@ SSL_CTX *git__ssl_ctx;
 
 #define GIT_SSL_DEFAULT_CIPHERS "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-DSS-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA:DHE-DSS-AES128-SHA256:DHE-DSS-AES256-SHA256:DHE-DSS-AES128-SHA:DHE-DSS-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA"
 
+/*
+ * OpenSSL 1.1 made BIO opaque so we have to use functions to interact with it
+ * which do not exist in previous versions. We define these inline functions so
+ * we can program against the interface instead of littering the implementation
+ * with ifdefs.
+ */
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
+     (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20700000L)
+
+static BIO_METHOD* BIO_meth_new(int type, const char *name)
+{
+	BIO_METHOD *meth = git__calloc(1, sizeof(BIO_METHOD));
+	if (!meth) {
+		return NULL;
+	}
+
+	meth->type = type;
+	meth->name = name;
+
+	return meth;
+}
+
+static void BIO_meth_free(BIO_METHOD *biom)
+{
+	git__free(biom);
+}
+
+static int BIO_meth_set_write(BIO_METHOD *biom, int (*write) (BIO *, const char *, int))
+{
+	biom->bwrite = write;
+	return 1;
+}
+
+static int BIO_meth_set_read(BIO_METHOD *biom, int (*read) (BIO *, char *, int))
+{
+	biom->bread = read;
+	return 1;
+}
+
+static int BIO_meth_set_puts(BIO_METHOD *biom, int (*puts) (BIO *, const char *))
+{
+	biom->bputs = puts;
+	return 1;
+}
+
+static int BIO_meth_set_gets(BIO_METHOD *biom, int (*gets) (BIO *, char *, int))
+
+{
+	biom->bgets = gets;
+	return 1;
+}
+
+static int BIO_meth_set_ctrl(BIO_METHOD *biom, long (*ctrl) (BIO *, int, long, void *))
+{
+	biom->ctrl = ctrl;
+	return 1;
+}
+
+static int BIO_meth_set_create(BIO_METHOD *biom, int (*create) (BIO *))
+{
+	biom->create = create;
+	return 1;
+}
+
+static int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy) (BIO *))
+{
+	biom->destroy = destroy;
+	return 1;
+}
+
+static int BIO_get_new_index(void)
+{
+	/* This exists as of 1.1 so before we'd just have 0 */
+	return 0;
+}
+
+static void BIO_set_init(BIO *b, int init)
+{
+	b->init = init;
+}
+
+static void BIO_set_data(BIO *a, void *ptr)
+{
+	a->ptr = ptr;
+}
+
+static void *BIO_get_data(BIO *a)
+{
+	return a->ptr;
+}
+
+static const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x)
+{
+	return ASN1_STRING_data((ASN1_STRING *)x);
+}
+
+#endif
+
 #if defined(GIT_THREADS) && OPENSSL_VERSION_NUMBER < 0x10100000L
 
 static git_mutex *openssl_locks;

src/streams/openssl.h

@@ -17,111 +17,4 @@ extern int git_openssl_stream_new(git_stream **out, const char *host, const char
 
 extern int git_openssl__set_cert_location(const char *file, const char *path);
 
-/*
- * OpenSSL 1.1 made BIO opaque so we have to use functions to interact with it
- * which do not exist in previous versions. We define these inline functions so
- * we can program against the interface instead of littering the implementation
- * with ifdefs.
- */
-#ifdef GIT_OPENSSL
-# include <openssl/ssl.h>
-# include <openssl/err.h>
-# include <openssl/x509v3.h>
-# include <openssl/bio.h>
-
-
-
-# if OPENSSL_VERSION_NUMBER < 0x10100000L || \
-     (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20700000L)
-
-GIT_INLINE(BIO_METHOD*) BIO_meth_new(int type, const char *name)
-{
-	BIO_METHOD *meth = git__calloc(1, sizeof(BIO_METHOD));
-	if (!meth) {
-		return NULL;
-	}
-
-	meth->type = type;
-	meth->name = name;
-
-	return meth;
-}
-
-GIT_INLINE(void) BIO_meth_free(BIO_METHOD *biom)
-{
-	git__free(biom);
-}
-
-GIT_INLINE(int) BIO_meth_set_write(BIO_METHOD *biom, int (*write) (BIO *, const char *, int))
-{
-	biom->bwrite = write;
-	return 1;
-}
-
-GIT_INLINE(int) BIO_meth_set_read(BIO_METHOD *biom, int (*read) (BIO *, char *, int))
-{
-	biom->bread = read;
-	return 1;
-}
-
-GIT_INLINE(int) BIO_meth_set_puts(BIO_METHOD *biom, int (*puts) (BIO *, const char *))
-{
-	biom->bputs = puts;
-	return 1;
-}
-
-GIT_INLINE(int) BIO_meth_set_gets(BIO_METHOD *biom, int (*gets) (BIO *, char *, int))
-
-{
-	biom->bgets = gets;
-	return 1;
-}
-
-GIT_INLINE(int) BIO_meth_set_ctrl(BIO_METHOD *biom, long (*ctrl) (BIO *, int, long, void *))
-{
-	biom->ctrl = ctrl;
-	return 1;
-}
-
-GIT_INLINE(int) BIO_meth_set_create(BIO_METHOD *biom, int (*create) (BIO *))
-{
-	biom->create = create;
-	return 1;
-}
-
-GIT_INLINE(int) BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy) (BIO *))
-{
-	biom->destroy = destroy;
-	return 1;
-}
-
-GIT_INLINE(int) BIO_get_new_index(void)
-{
-	/* This exists as of 1.1 so before we'd just have 0 */
-	return 0;
-}
-
-GIT_INLINE(void) BIO_set_init(BIO *b, int init)
-{
-	b->init = init;
-}
-
-GIT_INLINE(void) BIO_set_data(BIO *a, void *ptr)
-{
-	a->ptr = ptr;
-}
-
-GIT_INLINE(void*) BIO_get_data(BIO *a)
-{
-	return a->ptr;
-}
-
-GIT_INLINE(const unsigned char *) ASN1_STRING_get0_data(const ASN1_STRING *x)
-{
-	return ASN1_STRING_data((ASN1_STRING *)x);
-}
-
-# endif // OpenSSL < 1.1
-#endif // GIT_OPENSSL
-
 #endif