From 5ed90e00022ef392feaf95d9960e0cfaf01ed346 Mon Sep 17 00:00:00 2001
From: jsing <>
Date: Thu, 12 Jan 2017 16:08:49 +0000
Subject: Simplify the TLS callback BIO code - a pointer to the tls context can
 be stored directly in bio->ptr, rather than allocating and deallocating an
 intermediate struct.

Diff from Marko Kreen <markokr at gmail dot com> - thanks!
---
 src/lib/libtls/tls_bio_cb.c | 73 +++++----------------------------------------
 1 file changed, 7 insertions(+), 66 deletions(-)

(limited to 'src')

diff --git a/src/lib/libtls/tls_bio_cb.c b/src/lib/libtls/tls_bio_cb.c
index f53039fa00..75d9685cb3 100644
--- a/src/lib/libtls/tls_bio_cb.c
+++ b/src/lib/libtls/tls_bio_cb.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls_bio_cb.c,v 1.16 2017/01/12 16:01:47 jsing Exp $ */
+/* $OpenBSD: tls_bio_cb.c,v 1.17 2017/01/12 16:08:49 jsing Exp $ */
 /*
  * Copyright (c) 2016 Tobias Pape <tobias@netshed.de>
  *
@@ -28,14 +28,6 @@ static int bio_cb_write(BIO *bio, const char *buf, int num);
 static int bio_cb_read(BIO *bio, char *buf, int size);
 static int bio_cb_puts(BIO *bio, const char *str);
 static long bio_cb_ctrl(BIO *bio, int cmd, long num, void *ptr);
-static int bio_cb_new(BIO *bio);
-static int bio_cb_free(BIO *bio);
-
-struct bio_cb {
-	int (*write_cb)(BIO *bio, const char *buf, int num, void *cb_arg);
-	int (*read_cb)(BIO *bio, char *buf, int size, void *cb_arg);
-	void *cb_arg;
-};
 
 static BIO_METHOD bio_cb_method = {
 	.type = BIO_TYPE_MEM,
@@ -44,8 +36,6 @@ static BIO_METHOD bio_cb_method = {
 	.bread = bio_cb_read,
 	.bputs = bio_cb_puts,
 	.ctrl = bio_cb_ctrl,
-	.create = bio_cb_new,
-	.destroy = bio_cb_free,
 };
 
 static BIO_METHOD *
@@ -54,52 +44,6 @@ bio_s_cb(void)
 	return (&bio_cb_method);
 }
 
-static int
-bio_cb_new(BIO *bio)
-{
-	struct bio_cb *bcb;
-
-	if ((bcb = calloc(1, sizeof(struct bio_cb))) == NULL)
-		return (0);
-
-	bio->shutdown = 1;
-	bio->init = 1;
-	bio->num = -1;
-	bio->ptr = bcb;
-
-	return (1);
-}
-
-static int
-bio_cb_free(BIO *bio)
-{
-	if (bio == NULL)
-		return (0);
-
-	if (bio->shutdown) {
-		if ((bio->init) && (bio->ptr != NULL)) {
-			free(bio->ptr);
-			bio->ptr = NULL;
-		}
-	}
-
-	return (1);
-}
-
-static int
-bio_cb_read(BIO *bio, char *buf, int size)
-{
-	struct bio_cb *bcb = bio->ptr;
-	return (bcb->read_cb(bio, buf, size, bcb->cb_arg));
-}
-
-static int
-bio_cb_write(BIO *bio, const char *buf, int num)
-{
-	struct bio_cb *bcb = bio->ptr;
-	return (bcb->write_cb(bio, buf, num, bcb->cb_arg));
-}
-
 static int
 bio_cb_puts(BIO *bio, const char *str)
 {
@@ -135,9 +79,9 @@ bio_cb_ctrl(BIO *bio, int cmd, long num, void *ptr)
 }
 
 static int
-tls_bio_write_cb(BIO *bio, const char *buf, int num, void *cb_arg)
+bio_cb_write(BIO *bio, const char *buf, int num)
 {
-	struct tls *ctx = cb_arg;
+	struct tls *ctx = bio->ptr;
 	int rv;
 
 	BIO_clear_retry_flags(bio);
@@ -153,9 +97,9 @@ tls_bio_write_cb(BIO *bio, const char *buf, int num, void *cb_arg)
 }
 
 static int
-tls_bio_read_cb(BIO *bio, char *buf, int size, void *cb_arg)
+bio_cb_read(BIO *bio, char *buf, int size)
 {
-	struct tls *ctx = cb_arg;
+	struct tls *ctx = bio->ptr;
 	int rv;
 
 	BIO_clear_retry_flags(bio);
@@ -173,7 +117,6 @@ tls_bio_read_cb(BIO *bio, char *buf, int size, void *cb_arg)
 static BIO *
 tls_get_new_cb_bio(struct tls *ctx)
 {
-	struct bio_cb *bcb;
 	BIO *bio;
 
 	if (ctx->read_cb == NULL || ctx->write_cb == NULL) {
@@ -185,10 +128,8 @@ tls_get_new_cb_bio(struct tls *ctx)
 		return (NULL);
 	}
 
-	bcb = (struct bio_cb *)bio->ptr;
-	bcb->read_cb = tls_bio_read_cb;
-	bcb->write_cb = tls_bio_write_cb;
-	bcb->cb_arg = ctx;
+	bio->ptr = ctx;
+	bio->init = 1;
 
 	return (bio);
 }
-- 
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