Squashed 'third_party/libevent/' content from commit d8ceae8
Change-Id: I84e1b23561eb225b9f288717b028e6bc9e5a27e1
git-subtree-dir: third_party/libevent
git-subtree-split: d8ceae81b83f3d0a56e2f41d4c429b2702a8e302
diff --git a/bufferevent_openssl.c b/bufferevent_openssl.c
new file mode 100644
index 0000000..7582d9b
--- /dev/null
+++ b/bufferevent_openssl.c
@@ -0,0 +1,1454 @@
+/*
+ * 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.
+ */
+
+#include <sys/types.h>
+
+#include "event2/event-config.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/bio.h>
+#include <openssl/ssl.h>
+#include <openssl/err.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)
+{
+ b->init = 0;
+ b->num = -1;
+ b->ptr = NULL; /* We'll be putting the bufferevent in this field.*/
+ b->flags = 0;
+ return 1;
+}
+
+/* Called to uninitialize the BIO. */
+static int
+bio_bufferevent_free(BIO *b)
+{
+ if (!b)
+ return 0;
+ if (b->shutdown) {
+ if (b->init && b->ptr)
+ bufferevent_free(b->ptr);
+ b->init = 0;
+ b->flags = 0;
+ b->ptr = NULL;
+ }
+ 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 (!b->ptr)
+ return -1;
+
+ input = bufferevent_get_input(b->ptr);
+ 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 info the BIO */
+static int
+bio_bufferevent_write(BIO *b, const char *in, int inlen)
+{
+ struct bufferevent *bufev = b->ptr;
+ struct evbuffer *output;
+ size_t outlen;
+
+ BIO_clear_retry_flags(b);
+
+ if (!b->ptr)
+ 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 = b->ptr;
+ long ret = 1;
+
+ switch (cmd) {
+ case BIO_CTRL_GET_CLOSE:
+ ret = b->shutdown;
+ break;
+ case BIO_CTRL_SET_CLOSE:
+ b->shutdown = (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 = {
+ BIO_TYPE_LIBEVENT, "bufferevent",
+ bio_bufferevent_write,
+ bio_bufferevent_read,
+ bio_bufferevent_puts,
+ NULL /* bio_bufferevent_gets */,
+ bio_bufferevent_ctrl,
+ bio_bufferevent_new,
+ bio_bufferevent_free,
+ NULL /* callback_ctrl */,
+};
+
+/* Return the method table for the bufferevents BIO */
+static BIO_METHOD *
+BIO_s_bufferevent(void)
+{
+ 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, int close_flag)
+{
+ BIO *result;
+ if (!bufferevent)
+ return NULL;
+ if (!(result = BIO_new(BIO_s_bufferevent())))
+ return NULL;
+ result->init = 1;
+ result->ptr = bufferevent;
+ result->shutdown = close_flag ? 1 : 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;
+ /* XXX */
+ unsigned allow_dirty_shutdown : 1;
+ /* XXXX */
+ unsigned fd_is_set : 1;
+ /* XXX */
+ unsigned n_errors : 2;
+
+ /* Are we currently connecting, accepting, or doing IO? */
+ unsigned state : 2;
+};
+
+static int be_openssl_enable(struct bufferevent *, short);
+static int be_openssl_disable(struct bufferevent *, short);
+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_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->be_ops != &bufferevent_ops_openssl)
+ return NULL;
+ bev_o = (void*)( ((char*)bev) -
+ evutil_offsetof(struct bufferevent_openssl, bev.bev));
+ EVUTIL_ASSERT(bev_o->bev.bev.be_ops == &bufferevent_ops_openssl);
+ 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) {
+ ;
+ } 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) {
+ ;
+ } 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 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 && ERR_peek_error() == 0)
+ dirty_shutdown = 1;
+ break;
+ case SSL_ERROR_SSL:
+ /* Protocol error. */
+ break;
+ case SSL_ERROR_WANT_X509_LOOKUP:
+ /* XXXX handle this. */
+ 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);
+
+ _bufferevent_run_eventcb(&bev_ssl->bev.bev, event);
+}
+
+static void
+init_bio_counts(struct bufferevent_openssl *bev_ssl)
+{
+ bev_ssl->counts.n_written =
+ BIO_number_written(SSL_get_wbio(bev_ssl->ssl));
+ bev_ssl->counts.n_read =
+ BIO_number_read(SSL_get_rbio(bev_ssl->ssl));
+}
+
+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;
+ 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, 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;
+
+ 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, 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);
+
+ if (evbuffer_get_length(output) <= bev->wm_write.low)
+ _bufferevent_run_writecb(bev);
+ }
+ 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;
+ struct evbuffer *input = bev->input;
+
+ if (evbuffer_get_length(input) >= bev->wm_read.low) {
+ _bufferevent_run_readcb(bev);
+ }
+ }
+
+ 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;
+ struct evbuffer *input = bev->input;
+
+ if (evbuffer_get_length(input) >= bev->wm_read.low) {
+ _bufferevent_run_readcb(bev);
+ }
+ }
+ 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);
+}
+
+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);
+ } 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);
+ } else {
+ consider_writing(bev_ssl);
+ }
+ _bufferevent_decref_and_unlock(&bev_ssl->bev.bev);
+}
+
+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 (fd < 0 && bev_ssl->fd_is_set)
+ fd = event_get_fd(&bev->ev_read);
+ if (bev_ssl->fd_is_set) {
+ 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, be_openssl_readeventcb, bev_ssl);
+ event_assign(&bev->ev_write, bev->ev_base, fd,
+ EV_WRITE|EV_PERSIST, 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);
+ if (fd >= 0) {
+ bev_ssl->fd_is_set = 1;
+ }
+ 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:
+ r = SSL_do_handshake(bev_ssl->ssl);
+ break;
+ }
+ decrement_buckets(bev_ssl);
+
+ if (r==1) {
+ /* We're done! */
+ bev_ssl->state = BUFFEREVENT_SSL_OPEN;
+ set_open_callbacks(bev_ssl, -1); /* 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);
+ return 1;
+ } else {
+ int err = SSL_get_error(bev_ssl->ssl, r);
+ print_err(err);
+ switch (err) {
+ case SSL_ERROR_WANT_WRITE:
+ if (!bev_ssl->underlying) {
+ stop_reading(bev_ssl);
+ return start_writing(bev_ssl);
+ }
+ return 0;
+ case SSL_ERROR_WANT_READ:
+ if (!bev_ssl->underlying) {
+ stop_writing(bev_ssl);
+ return start_reading(bev_ssl);
+ }
+ return 0;
+ default:
+ conn_closed(bev_ssl, 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);
+ } 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);
+ return do_handshake(bev_ssl);
+ } else {
+ struct bufferevent *bev = &bev_ssl->bev.bev;
+ int r1=0, r2=0;
+ if (fd < 0 && bev_ssl->fd_is_set)
+ fd = event_get_fd(&bev->ev_read);
+ if (bev_ssl->fd_is_set) {
+ event_del(&bev->ev_read);
+ event_del(&bev->ev_write);
+ }
+ event_assign(&bev->ev_read, bev->ev_base, fd,
+ EV_READ|EV_PERSIST, be_openssl_handshakeeventcb, bev_ssl);
+ event_assign(&bev->ev_write, bev->ev_base, fd,
+ EV_WRITE|EV_PERSIST, be_openssl_handshakeeventcb, bev_ssl);
+ if (fd >= 0) {
+ r1 = _bufferevent_add_event(&bev->ev_read, &bev->timeout_read);
+ r2 = _bufferevent_add_event(&bev->ev_write, &bev->timeout_write);
+ bev_ssl->fd_is_set = 1;
+ }
+ return (r1<0 || r2<0) ? -1 : 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, -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);
+ 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 (bev_ssl->state != BUFFEREVENT_SSL_OPEN)
+ return 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 (bev_ssl->state != BUFFEREVENT_SSL_OPEN)
+ return 0;
+
+ 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_destruct(struct bufferevent *bev)
+{
+ struct bufferevent_openssl *bev_ssl = upcast(bev);
+
+ if (bev_ssl->underlying) {
+ _bufferevent_del_generic_timeout_cbs(bev);
+ } else {
+ event_del(&bev->ev_read);
+ event_del(&bev->ev_write);
+ }
+
+ 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);
+ bev_ssl->underlying = NULL;
+ }
+ } else {
+ evutil_socket_t fd = -1;
+ 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);
+ } 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 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 {
+ int r1=0, r2=0;
+ if (event_pending(&bev->ev_read, EV_READ, NULL))
+ r1 = _bufferevent_add_event(&bev->ev_read, &bev->timeout_read);
+ if (event_pending(&bev->ev_write, EV_WRITE, NULL))
+ r2 = _bufferevent_add_event(&bev->ev_write, &bev->timeout_write);
+ return (r1<0 || r2<0) ? -1 : 0;
+ }
+}
+
+static int
+be_openssl_flush(struct bufferevent *bufev,
+ short iotype, enum bufferevent_flush_mode mode)
+{
+ /* XXXX Implement this. */
+ 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)
+ return -1;
+ {
+ BIO *bio;
+ bio = BIO_new_socket(data->fd, 0);
+ SSL_set_bio(bev_ssl->ssl, bio, bio);
+ bev_ssl->fd_is_set = 1;
+ }
+ if (bev_ssl->state == BUFFEREVENT_SSL_OPEN)
+ return set_open_callbacks(bev_ssl, data->fd);
+ else {
+ return set_handshake_callbacks(bev_ssl, data->fd);
+ }
+ case BEV_CTRL_GET_FD:
+ if (bev_ssl->underlying)
+ return -1;
+ if (!bev_ssl->fd_is_set)
+ return -1;
+ data->fd = event_get_fd(&bev->ev_read);
+ return 0;
+ case BEV_CTRL_GET_UNDERLYING:
+ if (!bev_ssl->underlying)
+ return -1;
+ 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;
+
+ if (underlying != NULL && fd >= 0)
+ return NULL; /* Only one can be set. */
+
+ 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->state = state;
+ bev_ssl->last_write = -1;
+
+ init_bio_counts(bev_ssl);
+
+ switch (state) {
+ case BUFFEREVENT_SSL_ACCEPTING:
+ SSL_set_accept_state(bev_ssl->ssl);
+ if (set_handshake_callbacks(bev_ssl, fd) < 0)
+ goto err;
+ break;
+ case BUFFEREVENT_SSL_CONNECTING:
+ SSL_set_connect_state(bev_ssl->ssl);
+ if (set_handshake_callbacks(bev_ssl, fd) < 0)
+ goto err;
+ break;
+ case BUFFEREVENT_SSL_OPEN:
+ if (set_open_callbacks(bev_ssl, fd) < 0)
+ goto err;
+ break;
+ default:
+ 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);
+ } else {
+ bev_ssl->bev.bev.enabled = EV_READ|EV_WRITE;
+ if (bev_ssl->fd_is_set) {
+ if (state != BUFFEREVENT_SSL_OPEN)
+ if (event_add(&bev_ssl->bev.bev.ev_read, NULL) < 0)
+ goto err;
+ if (event_add(&bev_ssl->bev.bev.ev_write, NULL) < 0)
+ goto err;
+ }
+ }
+
+ return &bev_ssl->bev.bev;
+err:
+ if (bev_ssl)
+ 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)
+{
+ /* We don't tell the BIO to close the bufferevent; we do it ourselves
+ * on be_openssl_destruct */
+ int close_flag = 0; /* options & BEV_OPT_CLOSE_ON_FREE; */
+ BIO *bio;
+ if (!underlying)
+ return NULL;
+ if (!(bio = BIO_new_bufferevent(underlying, close_flag)))
+ return NULL;
+
+ SSL_set_bio(ssl, bio, bio);
+
+ return bufferevent_openssl_new_impl(
+ base, underlying, -1, ssl, state, options);
+}
+
+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. */
+ return NULL;
+ }
+ (void) 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(fd, 0);
+ SSL_set_bio(ssl, bio, bio);
+ } else {
+ /* Leave the fd unset. */
+ }
+ }
+
+ return bufferevent_openssl_new_impl(
+ base, NULL, fd, ssl, state, options);
+}
+
+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;
+}