smugfs(4): new program

src/cmd/smugfs/openssl.c

@@ -0,0 +1,98 @@
+#include <u.h>
+#include <openssl/bio.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include "a.h"
+
+AUTOLIB(ssl)
+
+static void
+httpsinit(void)
+{
+	ERR_load_crypto_strings();
+	ERR_load_SSL_strings();
+	SSL_load_error_strings();
+	SSL_library_init();
+}
+
+struct Pfd
+{
+	BIO *sbio;
+};
+
+static Pfd*
+opensslconnect(char *host)
+{
+	Pfd *pfd;
+	BIO *sbio;
+	SSL_CTX *ctx;
+	SSL *ssl;
+	static int didinit;
+	char buf[1024];
+
+	if(!didinit){
+		httpsinit();
+		didinit = 1;
+	}
+
+	ctx = SSL_CTX_new(SSLv23_client_method());
+	sbio = BIO_new_ssl_connect(ctx);
+	BIO_get_ssl(sbio, &ssl);
+	SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
+	
+	snprint(buf, sizeof buf, "%s:https", host);
+	BIO_set_conn_hostname(sbio, buf);
+	
+	if(BIO_do_connect(sbio) <= 0 || BIO_do_handshake(sbio) <= 0){
+		ERR_error_string_n(ERR_get_error(), buf, sizeof buf);
+		BIO_free_all(sbio);
+		werrstr("openssl: %s", buf);
+		return nil;
+	}
+
+	pfd = emalloc(sizeof *pfd);
+	pfd->sbio = sbio;
+	return pfd;
+}
+
+static void
+opensslclose(Pfd *pfd)
+{
+	if(pfd == nil)
+		return;
+	BIO_free_all(pfd->sbio);
+	free(pfd);
+}
+
+static int
+opensslwrite(Pfd *pfd, void *v, int n)
+{
+	int m, total;
+	char *p;
+	
+	p = v;
+	total = 0;
+	while(total < n){
+		if((m = BIO_write(pfd->sbio, p+total, n-total)) <= 0){
+			if(total == 0)
+				return m;
+			return total;
+		}
+		total += m;
+	}
+	return total;	
+}
+
+static int
+opensslread(Pfd *pfd, void *v, int n)
+{
+	return BIO_read(pfd->sbio, v, n);
+}
+
+Protocol https =
+{
+	opensslconnect,
+	opensslread,
+	opensslwrite,
+	opensslclose
+};