Adding upstream version 1.0.18.upstream/1.0.18upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1524 insertions, 0 deletions

diff --git a/libevent/bufferevent_openssl.c b/libevent/bufferevent_openssl.c
new file mode 100644
index 0000000..b51b834
--- /dev/null
+++ b/libevent/bufferevent_openssl.c
@@ -0,0 +1,1524 @@
+/*
+ * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// Get rid of OSX 10.7 and greater deprecation warnings.
+#if defined(__APPLE__) && defined(__clang__)
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
+#include "event2/event-config.h"
+#include "evconfig-private.h"
+
+#include <sys/types.h>
+
+#ifdef EVENT__HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef EVENT__HAVE_STDARG_H
+#include <stdarg.h>
+#endif
+#ifdef EVENT__HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef _WIN32
+#include <winsock2.h>
+#endif
+
+#include "event2/bufferevent.h"
+#include "event2/bufferevent_struct.h"
+#include "event2/bufferevent_ssl.h"
+#include "event2/buffer.h"
+#include "event2/event.h"
+
+#include "mm-internal.h"
+#include "bufferevent-internal.h"
+#include "log-internal.h"
+
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include "openssl-compat.h"
+
+/*
+ * Define an OpenSSL bio that targets a bufferevent.
+ */
+
+/* --------------------
+   A BIO is an OpenSSL abstraction that handles reading and writing data.  The
+   library will happily speak SSL over anything that implements a BIO
+   interface.
+
+   Here we define a BIO implementation that directs its output to a
+   bufferevent.  We'll want to use this only when none of OpenSSL's built-in
+   IO mechanisms work for us.
+   -------------------- */
+
+/* every BIO type needs its own integer type value. */
+#define BIO_TYPE_LIBEVENT 57
+/* ???? Arguably, we should set BIO_TYPE_FILTER or BIO_TYPE_SOURCE_SINK on
+ * this. */
+
+#if 0
+static void
+print_err(int val)
+{
+	int err;
+	printf("Error was %d\n", val);
+
+	while ((err = ERR_get_error())) {
+		const char *msg = (const char*)ERR_reason_error_string(err);
+		const char *lib = (const char*)ERR_lib_error_string(err);
+		const char *func = (const char*)ERR_func_error_string(err);
+
+		printf("%s in %s %s\n", msg, lib, func);
+	}
+}
+#else
+#define print_err(v) ((void)0)
+#endif
+
+/* Called to initialize a new BIO */
+static int
+bio_bufferevent_new(BIO *b)
+{
+	BIO_set_init(b, 0);
+	BIO_set_data(b, NULL); /* We'll be putting the bufferevent in this field.*/
+	return 1;
+}
+
+/* Called to uninitialize the BIO. */
+static int
+bio_bufferevent_free(BIO *b)
+{
+	if (!b)
+		return 0;
+	if (BIO_get_shutdown(b)) {
+		if (BIO_get_init(b) && BIO_get_data(b))
+			bufferevent_free(BIO_get_data(b));
+		BIO_free(b);
+	}
+	return 1;
+}
+
+/* Called to extract data from the BIO. */
+static int
+bio_bufferevent_read(BIO *b, char *out, int outlen)
+{
+	int r = 0;
+	struct evbuffer *input;
+
+	BIO_clear_retry_flags(b);
+
+	if (!out)
+		return 0;
+	if (!BIO_get_data(b))
+		return -1;
+
+	input = bufferevent_get_input(BIO_get_data(b));
+	if (evbuffer_get_length(input) == 0) {
+		/* If there's no data to read, say so. */
+		BIO_set_retry_read(b);
+		return -1;
+	} else {
+		r = evbuffer_remove(input, out, outlen);
+	}
+
+	return r;
+}
+
+/* Called to write data into the BIO */
+static int
+bio_bufferevent_write(BIO *b, const char *in, int inlen)
+{
+	struct bufferevent *bufev = BIO_get_data(b);
+	struct evbuffer *output;
+	size_t outlen;
+
+	BIO_clear_retry_flags(b);
+
+	if (!BIO_get_data(b))
+		return -1;
+
+	output = bufferevent_get_output(bufev);
+	outlen = evbuffer_get_length(output);
+
+	/* Copy only as much data onto the output buffer as can fit under the
+	 * high-water mark. */
+	if (bufev->wm_write.high && bufev->wm_write.high <= (outlen+inlen)) {
+		if (bufev->wm_write.high <= outlen) {
+			/* If no data can fit, we'll need to retry later. */
+			BIO_set_retry_write(b);
+			return -1;
+		}
+		inlen = bufev->wm_write.high - outlen;
+	}
+
+	EVUTIL_ASSERT(inlen > 0);
+	evbuffer_add(output, in, inlen);
+	return inlen;
+}
+
+/* Called to handle various requests */
+static long
+bio_bufferevent_ctrl(BIO *b, int cmd, long num, void *ptr)
+{
+	struct bufferevent *bufev = BIO_get_data(b);
+	long ret = 1;
+
+	switch (cmd) {
+	case BIO_CTRL_GET_CLOSE:
+		ret = BIO_get_shutdown(b);
+		break;
+	case BIO_CTRL_SET_CLOSE:
+		BIO_set_shutdown(b, (int)num);
+		break;
+	case BIO_CTRL_PENDING:
+		ret = evbuffer_get_length(bufferevent_get_input(bufev)) != 0;
+		break;
+	case BIO_CTRL_WPENDING:
+		ret = evbuffer_get_length(bufferevent_get_output(bufev)) != 0;
+		break;
+	/* XXXX These two are given a special-case treatment because
+	 * of cargo-cultism.  I should come up with a better reason. */
+	case BIO_CTRL_DUP:
+	case BIO_CTRL_FLUSH:
+		ret = 1;
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+	return ret;
+}
+
+/* Called to write a string to the BIO */
+static int
+bio_bufferevent_puts(BIO *b, const char *s)
+{
+	return bio_bufferevent_write(b, s, strlen(s));
+}
+
+/* Method table for the bufferevent BIO */
+static BIO_METHOD *methods_bufferevent;
+
+/* Return the method table for the bufferevents BIO */
+static BIO_METHOD *
+BIO_s_bufferevent(void)
+{
+	if (methods_bufferevent == NULL) {
+		methods_bufferevent = BIO_meth_new(BIO_TYPE_LIBEVENT, "bufferevent");
+		if (methods_bufferevent == NULL)
+			return NULL;
+		BIO_meth_set_write(methods_bufferevent, bio_bufferevent_write);
+		BIO_meth_set_read(methods_bufferevent, bio_bufferevent_read);
+		BIO_meth_set_puts(methods_bufferevent, bio_bufferevent_puts);
+		BIO_meth_set_ctrl(methods_bufferevent, bio_bufferevent_ctrl);
+		BIO_meth_set_create(methods_bufferevent, bio_bufferevent_new);
+		BIO_meth_set_destroy(methods_bufferevent, bio_bufferevent_free);
+	}
+	return methods_bufferevent;
+}
+
+/* Create a new BIO to wrap communication around a bufferevent.  If close_flag
+ * is true, the bufferevent will be freed when the BIO is closed. */
+static BIO *
+BIO_new_bufferevent(struct bufferevent *bufferevent)
+{
+	BIO *result;
+	if (!bufferevent)
+		return NULL;
+	if (!(result = BIO_new(BIO_s_bufferevent())))
+		return NULL;
+	BIO_set_init(result, 1);
+	BIO_set_data(result, bufferevent);
+	/* We don't tell the BIO to close the bufferevent; we do it ourselves on
+	 * be_openssl_destruct() */
+	BIO_set_shutdown(result, 0);
+	return result;
+}
+
+/* --------------------
+   Now, here's the OpenSSL-based implementation of bufferevent.
+
+   The implementation comes in two flavors: one that connects its SSL object
+   to an underlying bufferevent using a BIO_bufferevent, and one that has the
+   SSL object connect to a socket directly.  The latter should generally be
+   faster, except on Windows, where your best bet is using a
+   bufferevent_async.
+
+   (OpenSSL supports many other BIO types, too.  But we can't use any unless
+   we have a good way to get notified when they become readable/writable.)
+   -------------------- */
+
+struct bio_data_counts {
+	unsigned long n_written;
+	unsigned long n_read;
+};
+
+struct bufferevent_openssl {
+	/* Shared fields with common bufferevent implementation code.
+	   If we were set up with an underlying bufferevent, we use the
+	   events here as timers only.  If we have an SSL, then we use
+	   the events as socket events.
+	 */
+	struct bufferevent_private bev;
+	/* An underlying bufferevent that we're directing our output to.
+	   If it's NULL, then we're connected to an fd, not an evbuffer. */
+	struct bufferevent *underlying;
+	/* The SSL object doing our encryption. */
+	SSL *ssl;
+
+	/* A callback that's invoked when data arrives on our outbuf so we
+	   know to write data to the SSL. */
+	struct evbuffer_cb_entry *outbuf_cb;
+
+	/* A count of how much data the bios have read/written total.  Used
+	   for rate-limiting. */
+	struct bio_data_counts counts;
+
+	/* If this value is greater than 0, then the last SSL_write blocked,
+	 * and we need to try it again with this many bytes. */
+	ev_ssize_t last_write;
+
+#define NUM_ERRORS 3
+	ev_uint32_t errors[NUM_ERRORS];
+
+	/* When we next get available space, we should say "read" instead of
+	   "write". This can happen if there's a renegotiation during a read
+	   operation. */
+	unsigned read_blocked_on_write : 1;
+	/* When we next get data, we should say "write" instead of "read". */
+	unsigned write_blocked_on_read : 1;
+	/* Treat TCP close before SSL close on SSL >= v3 as clean EOF. */
+	unsigned allow_dirty_shutdown : 1;
+	/* XXX */
+	unsigned n_errors : 2;
+
+	/* Are we currently connecting, accepting, or doing IO? */
+	unsigned state : 2;
+	/* If we reset fd, we sould reset state too */
+	unsigned old_state : 2;
+};
+
+static int be_openssl_enable(struct bufferevent *, short);
+static int be_openssl_disable(struct bufferevent *, short);
+static void be_openssl_unlink(struct bufferevent *);
+static void be_openssl_destruct(struct bufferevent *);
+static int be_openssl_adj_timeouts(struct bufferevent *);
+static int be_openssl_flush(struct bufferevent *bufev,
+    short iotype, enum bufferevent_flush_mode mode);
+static int be_openssl_ctrl(struct bufferevent *, enum bufferevent_ctrl_op, union bufferevent_ctrl_data *);
+
+const struct bufferevent_ops bufferevent_ops_openssl = {
+	"ssl",
+	evutil_offsetof(struct bufferevent_openssl, bev.bev),
+	be_openssl_enable,
+	be_openssl_disable,
+	be_openssl_unlink,
+	be_openssl_destruct,
+	be_openssl_adj_timeouts,
+	be_openssl_flush,
+	be_openssl_ctrl,
+};
+
+/* Given a bufferevent, return a pointer to the bufferevent_openssl that
+ * contains it, if any. */
+static inline struct bufferevent_openssl *
+upcast(struct bufferevent *bev)
+{
+	struct bufferevent_openssl *bev_o;
+	if (!BEV_IS_OPENSSL(bev))
+		return NULL;
+	bev_o = (void*)( ((char*)bev) -
+			 evutil_offsetof(struct bufferevent_openssl, bev.bev));
+	EVUTIL_ASSERT(BEV_IS_OPENSSL(&bev_o->bev.bev));
+	return bev_o;
+}
+
+static inline void
+put_error(struct bufferevent_openssl *bev_ssl, unsigned long err)
+{
+	if (bev_ssl->n_errors == NUM_ERRORS)
+		return;
+	/* The error type according to openssl is "unsigned long", but
+	   openssl never uses more than 32 bits of it.  It _can't_ use more
+	   than 32 bits of it, since it needs to report errors on systems
+	   where long is only 32 bits.
+	 */
+	bev_ssl->errors[bev_ssl->n_errors++] = (ev_uint32_t) err;
+}
+
+/* Have the base communications channel (either the underlying bufferevent or
+ * ev_read and ev_write) start reading.  Take the read-blocked-on-write flag
+ * into account. */
+static int
+start_reading(struct bufferevent_openssl *bev_ssl)
+{
+	if (bev_ssl->underlying) {
+		bufferevent_unsuspend_read_(bev_ssl->underlying,
+		    BEV_SUSPEND_FILT_READ);
+		return 0;
+	} else {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+		int r;
+		r = bufferevent_add_event_(&bev->ev_read, &bev->timeout_read);
+		if (r == 0 && bev_ssl->read_blocked_on_write)
+			r = bufferevent_add_event_(&bev->ev_write,
+			    &bev->timeout_write);
+		return r;
+	}
+}
+
+/* Have the base communications channel (either the underlying bufferevent or
+ * ev_read and ev_write) start writing.  Take the write-blocked-on-read flag
+ * into account. */
+static int
+start_writing(struct bufferevent_openssl *bev_ssl)
+{
+	int r = 0;
+	if (bev_ssl->underlying) {
+		if (bev_ssl->write_blocked_on_read) {
+			bufferevent_unsuspend_read_(bev_ssl->underlying,
+			    BEV_SUSPEND_FILT_READ);
+		}
+	} else {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+		r = bufferevent_add_event_(&bev->ev_write, &bev->timeout_write);
+		if (!r && bev_ssl->write_blocked_on_read)
+			r = bufferevent_add_event_(&bev->ev_read,
+			    &bev->timeout_read);
+	}
+	return r;
+}
+
+static void
+stop_reading(struct bufferevent_openssl *bev_ssl)
+{
+	if (bev_ssl->write_blocked_on_read)
+		return;
+	if (bev_ssl->underlying) {
+		bufferevent_suspend_read_(bev_ssl->underlying,
+		    BEV_SUSPEND_FILT_READ);
+	} else {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+		event_del(&bev->ev_read);
+	}
+}
+
+static void
+stop_writing(struct bufferevent_openssl *bev_ssl)
+{
+	if (bev_ssl->read_blocked_on_write)
+		return;
+	if (bev_ssl->underlying) {
+		bufferevent_unsuspend_read_(bev_ssl->underlying,
+		    BEV_SUSPEND_FILT_READ);
+	} else {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+		event_del(&bev->ev_write);
+	}
+}
+
+static int
+set_rbow(struct bufferevent_openssl *bev_ssl)
+{
+	if (!bev_ssl->underlying)
+		stop_reading(bev_ssl);
+	bev_ssl->read_blocked_on_write = 1;
+	return start_writing(bev_ssl);
+}
+
+static int
+set_wbor(struct bufferevent_openssl *bev_ssl)
+{
+	if (!bev_ssl->underlying)
+		stop_writing(bev_ssl);
+	bev_ssl->write_blocked_on_read = 1;
+	return start_reading(bev_ssl);
+}
+
+static int
+clear_rbow(struct bufferevent_openssl *bev_ssl)
+{
+	struct bufferevent *bev = &bev_ssl->bev.bev;
+	int r = 0;
+	bev_ssl->read_blocked_on_write = 0;
+	if (!(bev->enabled & EV_WRITE))
+		stop_writing(bev_ssl);
+	if (bev->enabled & EV_READ)
+		r = start_reading(bev_ssl);
+	return r;
+}
+
+
+static int
+clear_wbor(struct bufferevent_openssl *bev_ssl)
+{
+	struct bufferevent *bev = &bev_ssl->bev.bev;
+	int r = 0;
+	bev_ssl->write_blocked_on_read = 0;
+	if (!(bev->enabled & EV_READ))
+		stop_reading(bev_ssl);
+	if (bev->enabled & EV_WRITE)
+		r = start_writing(bev_ssl);
+	return r;
+}
+
+static void
+conn_closed(struct bufferevent_openssl *bev_ssl, int when, int errcode, int ret)
+{
+	int event = BEV_EVENT_ERROR;
+	int dirty_shutdown = 0;
+	unsigned long err;
+
+	switch (errcode) {
+	case SSL_ERROR_ZERO_RETURN:
+		/* Possibly a clean shutdown. */
+		if (SSL_get_shutdown(bev_ssl->ssl) & SSL_RECEIVED_SHUTDOWN)
+			event = BEV_EVENT_EOF;
+		else
+			dirty_shutdown = 1;
+		break;
+	case SSL_ERROR_SYSCALL:
+		/* IO error; possibly a dirty shutdown. */
+		if ((ret == 0 || ret == -1) && ERR_peek_error() == 0)
+			dirty_shutdown = 1;
+		put_error(bev_ssl, errcode);
+		break;
+	case SSL_ERROR_SSL:
+		/* Protocol error. */
+		put_error(bev_ssl, errcode);
+		break;
+	case SSL_ERROR_WANT_X509_LOOKUP:
+		/* XXXX handle this. */
+		put_error(bev_ssl, errcode);
+		break;
+	case SSL_ERROR_NONE:
+	case SSL_ERROR_WANT_READ:
+	case SSL_ERROR_WANT_WRITE:
+	case SSL_ERROR_WANT_CONNECT:
+	case SSL_ERROR_WANT_ACCEPT:
+	default:
+		/* should be impossible; treat as normal error. */
+		event_warnx("BUG: Unexpected OpenSSL error code %d", errcode);
+		break;
+	}
+
+	while ((err = ERR_get_error())) {
+		put_error(bev_ssl, err);
+	}
+
+	if (dirty_shutdown && bev_ssl->allow_dirty_shutdown)
+		event = BEV_EVENT_EOF;
+
+	stop_reading(bev_ssl);
+	stop_writing(bev_ssl);
+
+	/* when is BEV_EVENT_{READING|WRITING} */
+	event = when | event;
+	bufferevent_run_eventcb_(&bev_ssl->bev.bev, event, 0);
+}
+
+static void
+init_bio_counts(struct bufferevent_openssl *bev_ssl)
+{
+	BIO *rbio, *wbio;
+
+	wbio = SSL_get_wbio(bev_ssl->ssl);
+	bev_ssl->counts.n_written = wbio ? BIO_number_written(wbio) : 0;
+	rbio = SSL_get_rbio(bev_ssl->ssl);
+	bev_ssl->counts.n_read = rbio ? BIO_number_read(rbio) : 0;
+}
+
+static inline void
+decrement_buckets(struct bufferevent_openssl *bev_ssl)
+{
+	unsigned long num_w = BIO_number_written(SSL_get_wbio(bev_ssl->ssl));
+	unsigned long num_r = BIO_number_read(SSL_get_rbio(bev_ssl->ssl));
+	/* These next two subtractions can wrap around. That's okay. */
+	unsigned long w = num_w - bev_ssl->counts.n_written;
+	unsigned long r = num_r - bev_ssl->counts.n_read;
+	if (w)
+		bufferevent_decrement_write_buckets_(&bev_ssl->bev, w);
+	if (r)
+		bufferevent_decrement_read_buckets_(&bev_ssl->bev, r);
+	bev_ssl->counts.n_written = num_w;
+	bev_ssl->counts.n_read = num_r;
+}
+
+#define OP_MADE_PROGRESS 1
+#define OP_BLOCKED 2
+#define OP_ERR 4
+
+/* Return a bitmask of OP_MADE_PROGRESS (if we read anything); OP_BLOCKED (if
+   we're now blocked); and OP_ERR (if an error occurred). */
+static int
+do_read(struct bufferevent_openssl *bev_ssl, int n_to_read) {
+	/* Requires lock */
+	struct bufferevent *bev = &bev_ssl->bev.bev;
+	struct evbuffer *input = bev->input;
+	int r, n, i, n_used = 0, atmost;
+	struct evbuffer_iovec space[2];
+	int result = 0;
+
+	if (bev_ssl->bev.read_suspended)
+		return 0;
+
+	atmost = bufferevent_get_read_max_(&bev_ssl->bev);
+	if (n_to_read > atmost)
+		n_to_read = atmost;
+
+	n = evbuffer_reserve_space(input, n_to_read, space, 2);
+	if (n < 0)
+		return OP_ERR;
+
+	for (i=0; i<n; ++i) {
+		if (bev_ssl->bev.read_suspended)
+			break;
+		ERR_clear_error();
+		r = SSL_read(bev_ssl->ssl, space[i].iov_base, space[i].iov_len);
+		if (r>0) {
+			result |= OP_MADE_PROGRESS;
+			if (bev_ssl->read_blocked_on_write)
+				if (clear_rbow(bev_ssl) < 0)
+					return OP_ERR | result;
+			++n_used;
+			space[i].iov_len = r;
+			decrement_buckets(bev_ssl);
+		} else {
+			int err = SSL_get_error(bev_ssl->ssl, r);
+			print_err(err);
+			switch (err) {
+			case SSL_ERROR_WANT_READ:
+				/* Can't read until underlying has more data. */
+				if (bev_ssl->read_blocked_on_write)
+					if (clear_rbow(bev_ssl) < 0)
+						return OP_ERR | result;
+				break;
+			case SSL_ERROR_WANT_WRITE:
+				/* This read operation requires a write, and the
+				 * underlying is full */
+				if (!bev_ssl->read_blocked_on_write)
+					if (set_rbow(bev_ssl) < 0)
+						return OP_ERR | result;
+				break;
+			default:
+				conn_closed(bev_ssl, BEV_EVENT_READING, err, r);
+				break;
+			}
+			result |= OP_BLOCKED;
+			break; /* out of the loop */
+		}
+	}
+
+	if (n_used) {
+		evbuffer_commit_space(input, space, n_used);
+		if (bev_ssl->underlying)
+			BEV_RESET_GENERIC_READ_TIMEOUT(bev);
+	}
+
+	return result;
+}
+
+/* Return a bitmask of OP_MADE_PROGRESS (if we wrote anything); OP_BLOCKED (if
+   we're now blocked); and OP_ERR (if an error occurred). */
+static int
+do_write(struct bufferevent_openssl *bev_ssl, int atmost)
+{
+	int i, r, n, n_written = 0;
+	struct bufferevent *bev = &bev_ssl->bev.bev;
+	struct evbuffer *output = bev->output;
+	struct evbuffer_iovec space[8];
+	int result = 0;
+
+	if (bev_ssl->last_write > 0)
+		atmost = bev_ssl->last_write;
+	else
+		atmost = bufferevent_get_write_max_(&bev_ssl->bev);
+
+	n = evbuffer_peek(output, atmost, NULL, space, 8);
+	if (n < 0)
+		return OP_ERR | result;
+
+	if (n > 8)
+		n = 8;
+	for (i=0; i < n; ++i) {
+		if (bev_ssl->bev.write_suspended)
+			break;
+
+		/* SSL_write will (reasonably) return 0 if we tell it to
+		   send 0 data.  Skip this case so we don't interpret the
+		   result as an error */
+		if (space[i].iov_len == 0)
+			continue;
+
+		ERR_clear_error();
+		r = SSL_write(bev_ssl->ssl, space[i].iov_base,
+		    space[i].iov_len);
+		if (r > 0) {
+			result |= OP_MADE_PROGRESS;
+			if (bev_ssl->write_blocked_on_read)
+				if (clear_wbor(bev_ssl) < 0)
+					return OP_ERR | result;
+			n_written += r;
+			bev_ssl->last_write = -1;
+			decrement_buckets(bev_ssl);
+		} else {
+			int err = SSL_get_error(bev_ssl->ssl, r);
+			print_err(err);
+			switch (err) {
+			case SSL_ERROR_WANT_WRITE:
+				/* Can't read until underlying has more data. */
+				if (bev_ssl->write_blocked_on_read)
+					if (clear_wbor(bev_ssl) < 0)
+						return OP_ERR | result;
+				bev_ssl->last_write = space[i].iov_len;
+				break;
+			case SSL_ERROR_WANT_READ:
+				/* This read operation requires a write, and the
+				 * underlying is full */
+				if (!bev_ssl->write_blocked_on_read)
+					if (set_wbor(bev_ssl) < 0)
+						return OP_ERR | result;
+				bev_ssl->last_write = space[i].iov_len;
+				break;
+			default:
+				conn_closed(bev_ssl, BEV_EVENT_WRITING, err, r);
+				bev_ssl->last_write = -1;
+				break;
+			}
+			result |= OP_BLOCKED;
+			break;
+		}
+	}
+	if (n_written) {
+		evbuffer_drain(output, n_written);
+		if (bev_ssl->underlying)
+			BEV_RESET_GENERIC_WRITE_TIMEOUT(bev);
+
+		bufferevent_trigger_nolock_(bev, EV_WRITE, BEV_OPT_DEFER_CALLBACKS);
+	}
+	return result;
+}
+
+#define WRITE_FRAME 15000
+
+#define READ_DEFAULT 4096
+
+/* Try to figure out how many bytes to read; return 0 if we shouldn't be
+ * reading. */
+static int
+bytes_to_read(struct bufferevent_openssl *bev)
+{
+	struct evbuffer *input = bev->bev.bev.input;
+	struct event_watermark *wm = &bev->bev.bev.wm_read;
+	int result = READ_DEFAULT;
+	ev_ssize_t limit;
+	/* XXX 99% of this is generic code that nearly all bufferevents will
+	 * want. */
+
+	if (bev->write_blocked_on_read) {
+		return 0;
+	}
+
+	if (! (bev->bev.bev.enabled & EV_READ)) {
+		return 0;
+	}
+
+	if (bev->bev.read_suspended) {
+		return 0;
+	}
+
+	if (wm->high) {
+		if (evbuffer_get_length(input) >= wm->high) {
+			return 0;
+		}
+
+		result = wm->high - evbuffer_get_length(input);
+	} else {
+		result = READ_DEFAULT;
+	}
+
+	/* Respect the rate limit */
+	limit = bufferevent_get_read_max_(&bev->bev);
+	if (result > limit) {
+		result = limit;
+	}
+
+	return result;
+}
+
+
+/* Things look readable.  If write is blocked on read, write till it isn't.
+ * Read from the underlying buffer until we block or we hit our high-water
+ * mark.
+ */
+static void
+consider_reading(struct bufferevent_openssl *bev_ssl)
+{
+	int r;
+	int n_to_read;
+	int all_result_flags = 0;
+
+	while (bev_ssl->write_blocked_on_read) {
+		r = do_write(bev_ssl, WRITE_FRAME);
+		if (r & (OP_BLOCKED|OP_ERR))
+			break;
+	}
+	if (bev_ssl->write_blocked_on_read)
+		return;
+
+	n_to_read = bytes_to_read(bev_ssl);
+
+	while (n_to_read) {
+		r = do_read(bev_ssl, n_to_read);
+		all_result_flags |= r;
+
+		if (r & (OP_BLOCKED|OP_ERR))
+			break;
+
+		if (bev_ssl->bev.read_suspended)
+			break;
+
+		/* Read all pending data.  This won't hit the network
+		 * again, and will (most importantly) put us in a state
+		 * where we don't need to read anything else until the
+		 * socket is readable again.  It'll potentially make us
+		 * overrun our read high-watermark (somewhat
+		 * regrettable).  The damage to the rate-limit has
+		 * already been done, since OpenSSL went and read a
+		 * whole SSL record anyway. */
+		n_to_read = SSL_pending(bev_ssl->ssl);
+
+		/* XXX This if statement is actually a bad bug, added to avoid
+		 * XXX a worse bug.
+		 *
+		 * The bad bug: It can potentially cause resource unfairness
+		 * by reading too much data from the underlying bufferevent;
+		 * it can potentially cause read looping if the underlying
+		 * bufferevent is a bufferevent_pair and deferred callbacks
+		 * aren't used.
+		 *
+		 * The worse bug: If we didn't do this, then we would
+		 * potentially not read any more from bev_ssl->underlying
+		 * until more data arrived there, which could lead to us
+		 * waiting forever.
+		 */
+		if (!n_to_read && bev_ssl->underlying)
+			n_to_read = bytes_to_read(bev_ssl);
+	}
+
+	if (all_result_flags & OP_MADE_PROGRESS) {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+
+		bufferevent_trigger_nolock_(bev, EV_READ, 0);
+	}
+
+	if (!bev_ssl->underlying) {
+		/* Should be redundant, but let's avoid busy-looping */
+		if (bev_ssl->bev.read_suspended ||
+		    !(bev_ssl->bev.bev.enabled & EV_READ)) {
+			event_del(&bev_ssl->bev.bev.ev_read);
+		}
+	}
+}
+
+static void
+consider_writing(struct bufferevent_openssl *bev_ssl)
+{
+	int r;
+	struct evbuffer *output = bev_ssl->bev.bev.output;
+	struct evbuffer *target = NULL;
+	struct event_watermark *wm = NULL;
+
+	while (bev_ssl->read_blocked_on_write) {
+		r = do_read(bev_ssl, 1024); /* XXXX 1024 is a hack */
+		if (r & OP_MADE_PROGRESS) {
+			struct bufferevent *bev = &bev_ssl->bev.bev;
+
+			bufferevent_trigger_nolock_(bev, EV_READ, 0);
+		}
+		if (r & (OP_ERR|OP_BLOCKED))
+			break;
+	}
+	if (bev_ssl->read_blocked_on_write)
+		return;
+	if (bev_ssl->underlying) {
+		target = bev_ssl->underlying->output;
+		wm = &bev_ssl->underlying->wm_write;
+	}
+	while ((bev_ssl->bev.bev.enabled & EV_WRITE) &&
+	    (! bev_ssl->bev.write_suspended) &&
+	    evbuffer_get_length(output) &&
+	    (!target || (! wm->high || evbuffer_get_length(target) < wm->high))) {
+		int n_to_write;
+		if (wm && wm->high)
+			n_to_write = wm->high - evbuffer_get_length(target);
+		else
+			n_to_write = WRITE_FRAME;
+		r = do_write(bev_ssl, n_to_write);
+		if (r & (OP_BLOCKED|OP_ERR))
+			break;
+	}
+
+	if (!bev_ssl->underlying) {
+		if (evbuffer_get_length(output) == 0) {
+			event_del(&bev_ssl->bev.bev.ev_write);
+		} else if (bev_ssl->bev.write_suspended ||
+		    !(bev_ssl->bev.bev.enabled & EV_WRITE)) {
+			/* Should be redundant, but let's avoid busy-looping */
+			event_del(&bev_ssl->bev.bev.ev_write);
+		}
+	}
+}
+
+static void
+be_openssl_readcb(struct bufferevent *bev_base, void *ctx)
+{
+	struct bufferevent_openssl *bev_ssl = ctx;
+	consider_reading(bev_ssl);
+}
+
+static void
+be_openssl_writecb(struct bufferevent *bev_base, void *ctx)
+{
+	struct bufferevent_openssl *bev_ssl = ctx;
+	consider_writing(bev_ssl);
+}
+
+static void
+be_openssl_eventcb(struct bufferevent *bev_base, short what, void *ctx)
+{
+	struct bufferevent_openssl *bev_ssl = ctx;
+	int event = 0;
+
+	if (what & BEV_EVENT_EOF) {
+		if (bev_ssl->allow_dirty_shutdown)
+			event = BEV_EVENT_EOF;
+		else
+			event = BEV_EVENT_ERROR;
+	} else if (what & BEV_EVENT_TIMEOUT) {
+		/* We sure didn't set this.  Propagate it to the user. */
+		event = what;
+	} else if (what & BEV_EVENT_ERROR) {
+		/* An error occurred on the connection.  Propagate it to the user. */
+		event = what;
+	} else if (what & BEV_EVENT_CONNECTED) {
+		/* Ignore it.  We're saying SSL_connect() already, which will
+		   eat it. */
+	}
+	if (event)
+		bufferevent_run_eventcb_(&bev_ssl->bev.bev, event, 0);
+}
+
+static void
+be_openssl_readeventcb(evutil_socket_t fd, short what, void *ptr)
+{
+	struct bufferevent_openssl *bev_ssl = ptr;
+	bufferevent_incref_and_lock_(&bev_ssl->bev.bev);
+	if (what == EV_TIMEOUT) {
+		bufferevent_run_eventcb_(&bev_ssl->bev.bev,
+		    BEV_EVENT_TIMEOUT|BEV_EVENT_READING, 0);
+	} else {
+		consider_reading(bev_ssl);
+	}
+	bufferevent_decref_and_unlock_(&bev_ssl->bev.bev);
+}
+
+static void
+be_openssl_writeeventcb(evutil_socket_t fd, short what, void *ptr)
+{
+	struct bufferevent_openssl *bev_ssl = ptr;
+	bufferevent_incref_and_lock_(&bev_ssl->bev.bev);
+	if (what == EV_TIMEOUT) {
+		bufferevent_run_eventcb_(&bev_ssl->bev.bev,
+		    BEV_EVENT_TIMEOUT|BEV_EVENT_WRITING, 0);
+	} else {
+		consider_writing(bev_ssl);
+	}
+	bufferevent_decref_and_unlock_(&bev_ssl->bev.bev);
+}
+
+static evutil_socket_t
+be_openssl_auto_fd(struct bufferevent_openssl *bev_ssl, evutil_socket_t fd)
+{
+	if (!bev_ssl->underlying) {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+		if (event_initialized(&bev->ev_read) && fd < 0) {
+			fd = event_get_fd(&bev->ev_read);
+		}
+	}
+	return fd;
+}
+
+static int
+set_open_callbacks(struct bufferevent_openssl *bev_ssl, evutil_socket_t fd)
+{
+	if (bev_ssl->underlying) {
+		bufferevent_setcb(bev_ssl->underlying,
+		    be_openssl_readcb, be_openssl_writecb, be_openssl_eventcb,
+		    bev_ssl);
+		return 0;
+	} else {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+		int rpending=0, wpending=0, r1=0, r2=0;
+
+		if (event_initialized(&bev->ev_read)) {
+			rpending = event_pending(&bev->ev_read, EV_READ, NULL);
+			wpending = event_pending(&bev->ev_write, EV_WRITE, NULL);
+
+			event_del(&bev->ev_read);
+			event_del(&bev->ev_write);
+		}
+
+		event_assign(&bev->ev_read, bev->ev_base, fd,
+		    EV_READ|EV_PERSIST|EV_FINALIZE,
+		    be_openssl_readeventcb, bev_ssl);
+		event_assign(&bev->ev_write, bev->ev_base, fd,
+		    EV_WRITE|EV_PERSIST|EV_FINALIZE,
+		    be_openssl_writeeventcb, bev_ssl);
+
+		if (rpending)
+			r1 = bufferevent_add_event_(&bev->ev_read, &bev->timeout_read);
+		if (wpending)
+			r2 = bufferevent_add_event_(&bev->ev_write, &bev->timeout_write);
+
+		return (r1<0 || r2<0) ? -1 : 0;
+	}
+}
+
+static int
+do_handshake(struct bufferevent_openssl *bev_ssl)
+{
+	int r;
+
+	switch (bev_ssl->state) {
+	default:
+	case BUFFEREVENT_SSL_OPEN:
+		EVUTIL_ASSERT(0);
+		return -1;
+	case BUFFEREVENT_SSL_CONNECTING:
+	case BUFFEREVENT_SSL_ACCEPTING:
+		ERR_clear_error();
+		r = SSL_do_handshake(bev_ssl->ssl);
+		break;
+	}
+	decrement_buckets(bev_ssl);
+
+	if (r==1) {
+		evutil_socket_t fd = event_get_fd(&bev_ssl->bev.bev.ev_read);
+		/* We're done! */
+		bev_ssl->state = BUFFEREVENT_SSL_OPEN;
+		set_open_callbacks(bev_ssl, fd); /* XXXX handle failure */
+		/* Call do_read and do_write as needed */
+		bufferevent_enable(&bev_ssl->bev.bev, bev_ssl->bev.bev.enabled);
+		bufferevent_run_eventcb_(&bev_ssl->bev.bev,
+		    BEV_EVENT_CONNECTED, 0);
+		return 1;
+	} else {
+		int err = SSL_get_error(bev_ssl->ssl, r);
+		print_err(err);
+		switch (err) {
+		case SSL_ERROR_WANT_WRITE:
+			stop_reading(bev_ssl);
+			return start_writing(bev_ssl);
+		case SSL_ERROR_WANT_READ:
+			stop_writing(bev_ssl);
+			return start_reading(bev_ssl);
+		default:
+			conn_closed(bev_ssl, BEV_EVENT_READING, err, r);
+			return -1;
+		}
+	}
+}
+
+static void
+be_openssl_handshakecb(struct bufferevent *bev_base, void *ctx)
+{
+	struct bufferevent_openssl *bev_ssl = ctx;
+	do_handshake(bev_ssl);/* XXX handle failure */
+}
+
+static void
+be_openssl_handshakeeventcb(evutil_socket_t fd, short what, void *ptr)
+{
+	struct bufferevent_openssl *bev_ssl = ptr;
+
+	bufferevent_incref_and_lock_(&bev_ssl->bev.bev);
+	if (what & EV_TIMEOUT) {
+		bufferevent_run_eventcb_(&bev_ssl->bev.bev, BEV_EVENT_TIMEOUT, 0);
+	} else
+		do_handshake(bev_ssl);/* XXX handle failure */
+	bufferevent_decref_and_unlock_(&bev_ssl->bev.bev);
+}
+
+static int
+set_handshake_callbacks(struct bufferevent_openssl *bev_ssl, evutil_socket_t fd)
+{
+	if (bev_ssl->underlying) {
+		bufferevent_setcb(bev_ssl->underlying,
+		    be_openssl_handshakecb, be_openssl_handshakecb,
+		    be_openssl_eventcb,
+		    bev_ssl);
+
+		if (fd < 0)
+			return 0;
+
+		if (bufferevent_setfd(bev_ssl->underlying, fd))
+			return 1;
+
+		return do_handshake(bev_ssl);
+	} else {
+		struct bufferevent *bev = &bev_ssl->bev.bev;
+
+		if (event_initialized(&bev->ev_read)) {
+			event_del(&bev->ev_read);
+			event_del(&bev->ev_write);
+		}
+
+		event_assign(&bev->ev_read, bev->ev_base, fd,
+		    EV_READ|EV_PERSIST|EV_FINALIZE,
+		    be_openssl_handshakeeventcb, bev_ssl);
+		event_assign(&bev->ev_write, bev->ev_base, fd,
+		    EV_WRITE|EV_PERSIST|EV_FINALIZE,
+		    be_openssl_handshakeeventcb, bev_ssl);
+		if (fd >= 0)
+			bufferevent_enable(bev, bev->enabled);
+		return 0;
+	}
+}
+
+int
+bufferevent_ssl_renegotiate(struct bufferevent *bev)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bev);
+	if (!bev_ssl)
+		return -1;
+	if (SSL_renegotiate(bev_ssl->ssl) < 0)
+		return -1;
+	bev_ssl->state = BUFFEREVENT_SSL_CONNECTING;
+	if (set_handshake_callbacks(bev_ssl, be_openssl_auto_fd(bev_ssl, -1)) < 0)
+		return -1;
+	if (!bev_ssl->underlying)
+		return do_handshake(bev_ssl);
+	return 0;
+}
+
+static void
+be_openssl_outbuf_cb(struct evbuffer *buf,
+    const struct evbuffer_cb_info *cbinfo, void *arg)
+{
+	struct bufferevent_openssl *bev_ssl = arg;
+	int r = 0;
+	/* XXX need to hold a reference here. */
+
+	if (cbinfo->n_added && bev_ssl->state == BUFFEREVENT_SSL_OPEN) {
+		if (cbinfo->orig_size == 0)
+			r = bufferevent_add_event_(&bev_ssl->bev.bev.ev_write,
+			    &bev_ssl->bev.bev.timeout_write);
+
+		if (bev_ssl->underlying)
+			consider_writing(bev_ssl);
+	}
+	/* XXX Handle r < 0 */
+	(void)r;
+}
+
+
+static int
+be_openssl_enable(struct bufferevent *bev, short events)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bev);
+	int r1 = 0, r2 = 0;
+
+	if (events & EV_READ)
+		r1 = start_reading(bev_ssl);
+	if (events & EV_WRITE)
+		r2 = start_writing(bev_ssl);
+
+	if (bev_ssl->underlying) {
+		if (events & EV_READ)
+			BEV_RESET_GENERIC_READ_TIMEOUT(bev);
+		if (events & EV_WRITE)
+			BEV_RESET_GENERIC_WRITE_TIMEOUT(bev);
+
+		if (events & EV_READ)
+			consider_reading(bev_ssl);
+		if (events & EV_WRITE)
+			consider_writing(bev_ssl);
+	}
+	return (r1 < 0 || r2 < 0) ? -1 : 0;
+}
+
+static int
+be_openssl_disable(struct bufferevent *bev, short events)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bev);
+
+	if (events & EV_READ)
+		stop_reading(bev_ssl);
+	if (events & EV_WRITE)
+		stop_writing(bev_ssl);
+
+	if (bev_ssl->underlying) {
+		if (events & EV_READ)
+			BEV_DEL_GENERIC_READ_TIMEOUT(bev);
+		if (events & EV_WRITE)
+			BEV_DEL_GENERIC_WRITE_TIMEOUT(bev);
+	}
+	return 0;
+}
+
+static void
+be_openssl_unlink(struct bufferevent *bev)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bev);
+
+	if (bev_ssl->bev.options & BEV_OPT_CLOSE_ON_FREE) {
+		if (bev_ssl->underlying) {
+			if (BEV_UPCAST(bev_ssl->underlying)->refcnt < 2) {
+				event_warnx("BEV_OPT_CLOSE_ON_FREE set on an "
+				    "bufferevent with too few references");
+			} else {
+				bufferevent_free(bev_ssl->underlying);
+				/* We still have a reference to it, via our
+				 * BIO. So we don't drop this. */
+				// bev_ssl->underlying = NULL;
+			}
+		}
+	} else {
+		if (bev_ssl->underlying) {
+			if (bev_ssl->underlying->errorcb == be_openssl_eventcb)
+				bufferevent_setcb(bev_ssl->underlying,
+				    NULL,NULL,NULL,NULL);
+			bufferevent_unsuspend_read_(bev_ssl->underlying,
+			    BEV_SUSPEND_FILT_READ);
+		}
+	}
+}
+
+static void
+be_openssl_destruct(struct bufferevent *bev)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bev);
+
+	if (bev_ssl->bev.options & BEV_OPT_CLOSE_ON_FREE) {
+		if (! bev_ssl->underlying) {
+			evutil_socket_t fd = EVUTIL_INVALID_SOCKET;
+			BIO *bio = SSL_get_wbio(bev_ssl->ssl);
+			if (bio)
+				fd = BIO_get_fd(bio, NULL);
+			if (fd >= 0)
+				evutil_closesocket(fd);
+		}
+		SSL_free(bev_ssl->ssl);
+	}
+}
+
+static int
+be_openssl_adj_timeouts(struct bufferevent *bev)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bev);
+
+	if (bev_ssl->underlying) {
+		return bufferevent_generic_adj_timeouts_(bev);
+	} else {
+		return bufferevent_generic_adj_existing_timeouts_(bev);
+	}
+}
+
+static int
+be_openssl_flush(struct bufferevent *bufev,
+    short iotype, enum bufferevent_flush_mode mode)
+{
+	/* XXXX Implement this. */
+	return 0;
+}
+
+static int
+be_openssl_set_fd(struct bufferevent_openssl *bev_ssl,
+    enum bufferevent_ssl_state state, evutil_socket_t fd)
+{
+	bev_ssl->state = state;
+
+	switch (state) {
+	case BUFFEREVENT_SSL_ACCEPTING:
+		if (!SSL_clear(bev_ssl->ssl))
+			return -1;
+		SSL_set_accept_state(bev_ssl->ssl);
+		if (set_handshake_callbacks(bev_ssl, fd) < 0)
+			return -1;
+		break;
+	case BUFFEREVENT_SSL_CONNECTING:
+		if (!SSL_clear(bev_ssl->ssl))
+			return -1;
+		SSL_set_connect_state(bev_ssl->ssl);
+		if (set_handshake_callbacks(bev_ssl, fd) < 0)
+			return -1;
+		break;
+	case BUFFEREVENT_SSL_OPEN:
+		if (set_open_callbacks(bev_ssl, fd) < 0)
+			return -1;
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+be_openssl_ctrl(struct bufferevent *bev,
+    enum bufferevent_ctrl_op op, union bufferevent_ctrl_data *data)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bev);
+	switch (op) {
+	case BEV_CTRL_SET_FD:
+		if (!bev_ssl->underlying) {
+			BIO *bio;
+			bio = BIO_new_socket((int)data->fd, 0);
+			SSL_set_bio(bev_ssl->ssl, bio, bio);
+		} else {
+			BIO *bio;
+			if (!(bio = BIO_new_bufferevent(bev_ssl->underlying)))
+				return -1;
+			SSL_set_bio(bev_ssl->ssl, bio, bio);
+		}
+
+		return be_openssl_set_fd(bev_ssl, bev_ssl->old_state, data->fd);
+	case BEV_CTRL_GET_FD:
+		if (bev_ssl->underlying) {
+			data->fd = event_get_fd(&bev_ssl->underlying->ev_read);
+		} else {
+			data->fd = event_get_fd(&bev->ev_read);
+		}
+		return 0;
+	case BEV_CTRL_GET_UNDERLYING:
+		data->ptr = bev_ssl->underlying;
+		return 0;
+	case BEV_CTRL_CANCEL_ALL:
+	default:
+		return -1;
+	}
+}
+
+SSL *
+bufferevent_openssl_get_ssl(struct bufferevent *bufev)
+{
+	struct bufferevent_openssl *bev_ssl = upcast(bufev);
+	if (!bev_ssl)
+		return NULL;
+	return bev_ssl->ssl;
+}
+
+static struct bufferevent *
+bufferevent_openssl_new_impl(struct event_base *base,
+    struct bufferevent *underlying,
+    evutil_socket_t fd,
+    SSL *ssl,
+    enum bufferevent_ssl_state state,
+    int options)
+{
+	struct bufferevent_openssl *bev_ssl = NULL;
+	struct bufferevent_private *bev_p = NULL;
+	int tmp_options = options & ~BEV_OPT_THREADSAFE;
+
+	/* Only one can be set. */
+	if (underlying != NULL && fd >= 0)
+		goto err;
+
+	if (!(bev_ssl = mm_calloc(1, sizeof(struct bufferevent_openssl))))
+		goto err;
+
+	bev_p = &bev_ssl->bev;
+
+	if (bufferevent_init_common_(bev_p, base,
+		&bufferevent_ops_openssl, tmp_options) < 0)
+		goto err;
+
+	/* Don't explode if we decide to realloc a chunk we're writing from in
+	 * the output buffer. */
+	SSL_set_mode(ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+
+	bev_ssl->underlying = underlying;
+	bev_ssl->ssl = ssl;
+
+	bev_ssl->outbuf_cb = evbuffer_add_cb(bev_p->bev.output,
+	    be_openssl_outbuf_cb, bev_ssl);
+
+	if (options & BEV_OPT_THREADSAFE)
+		bufferevent_enable_locking_(&bev_ssl->bev.bev, NULL);
+
+	if (underlying) {
+		bufferevent_init_generic_timeout_cbs_(&bev_ssl->bev.bev);
+		bufferevent_incref_(underlying);
+	}
+
+	bev_ssl->old_state = state;
+	bev_ssl->last_write = -1;
+
+	init_bio_counts(bev_ssl);
+
+	fd = be_openssl_auto_fd(bev_ssl, fd);
+	if (be_openssl_set_fd(bev_ssl, state, fd))
+		goto err;
+
+	if (underlying) {
+		bufferevent_setwatermark(underlying, EV_READ, 0, 0);
+		bufferevent_enable(underlying, EV_READ|EV_WRITE);
+		if (state == BUFFEREVENT_SSL_OPEN)
+			bufferevent_suspend_read_(underlying,
+			    BEV_SUSPEND_FILT_READ);
+	}
+
+	return &bev_ssl->bev.bev;
+err:
+	if (options & BEV_OPT_CLOSE_ON_FREE)
+		SSL_free(ssl);
+	if (bev_ssl) {
+		bev_ssl->ssl = NULL;
+		bufferevent_free(&bev_ssl->bev.bev);
+	}
+	return NULL;
+}
+
+struct bufferevent *
+bufferevent_openssl_filter_new(struct event_base *base,
+    struct bufferevent *underlying,
+    SSL *ssl,
+    enum bufferevent_ssl_state state,
+    int options)
+{
+	BIO *bio;
+	struct bufferevent *bev;
+
+	if (!underlying)
+		goto err;
+	if (!(bio = BIO_new_bufferevent(underlying)))
+		goto err;
+
+	SSL_set_bio(ssl, bio, bio);
+
+	bev = bufferevent_openssl_new_impl(
+		base, underlying, -1, ssl, state, options);
+	return bev;
+
+err:
+	if (options & BEV_OPT_CLOSE_ON_FREE)
+		SSL_free(ssl);
+	return NULL;
+}
+
+struct bufferevent *
+bufferevent_openssl_socket_new(struct event_base *base,
+    evutil_socket_t fd,
+    SSL *ssl,
+    enum bufferevent_ssl_state state,
+    int options)
+{
+	/* Does the SSL already have an fd? */
+	BIO *bio = SSL_get_wbio(ssl);
+	long have_fd = -1;
+
+	if (bio)
+		have_fd = BIO_get_fd(bio, NULL);
+
+	if (have_fd >= 0) {
+		/* The SSL is already configured with an fd. */
+		if (fd < 0) {
+			/* We should learn the fd from the SSL. */
+			fd = (evutil_socket_t) have_fd;
+		} else if (have_fd == (long)fd) {
+			/* We already know the fd from the SSL; do nothing */
+		} else {
+			/* We specified an fd different from that of the SSL.
+			   This is probably an error on our part.  Fail. */
+			goto err;
+		}
+		BIO_set_close(bio, 0);
+	} else {
+		/* The SSL isn't configured with a BIO with an fd. */
+		if (fd >= 0) {
+			/* ... and we have an fd we want to use. */
+			bio = BIO_new_socket((int)fd, 0);
+			SSL_set_bio(ssl, bio, bio);
+		} else {
+			/* Leave the fd unset. */
+		}
+	}
+
+	return bufferevent_openssl_new_impl(
+		base, NULL, fd, ssl, state, options);
+
+err:
+	if (options & BEV_OPT_CLOSE_ON_FREE)
+		SSL_free(ssl);
+	return NULL;
+}
+
+int
+bufferevent_openssl_get_allow_dirty_shutdown(struct bufferevent *bev)
+{
+	int allow_dirty_shutdown = -1;
+	struct bufferevent_openssl *bev_ssl;
+	BEV_LOCK(bev);
+	bev_ssl = upcast(bev);
+	if (bev_ssl)
+		allow_dirty_shutdown = bev_ssl->allow_dirty_shutdown;
+	BEV_UNLOCK(bev);
+	return allow_dirty_shutdown;
+}
+
+void
+bufferevent_openssl_set_allow_dirty_shutdown(struct bufferevent *bev,
+    int allow_dirty_shutdown)
+{
+	struct bufferevent_openssl *bev_ssl;
+	BEV_LOCK(bev);
+	bev_ssl = upcast(bev);
+	if (bev_ssl)
+		bev_ssl->allow_dirty_shutdown = !!allow_dirty_shutdown;
+	BEV_UNLOCK(bev);
+}
+
+unsigned long
+bufferevent_get_openssl_error(struct bufferevent *bev)
+{
+	unsigned long err = 0;
+	struct bufferevent_openssl *bev_ssl;
+	BEV_LOCK(bev);
+	bev_ssl = upcast(bev);
+	if (bev_ssl && bev_ssl->n_errors) {
+		err = bev_ssl->errors[--bev_ssl->n_errors];
+	}
+	BEV_UNLOCK(bev);
+	return err;
+}