michael@0: /*
michael@0:  * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
michael@0:  *
michael@0:  * All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. The name of the author may not be used to endorse or promote products
michael@0:  *    derived from this software without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
michael@0:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
michael@0:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
michael@0:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
michael@0:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
michael@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
michael@0:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0:  */
michael@0: 
michael@0: #include "event2/event-config.h"
michael@0: 
michael@0: #ifdef _EVENT_HAVE_SYS_TIME_H
michael@0: #include <sys/time.h>
michael@0: #endif
michael@0: 
michael@0: #include <errno.h>
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #ifdef _EVENT_HAVE_STDARG_H
michael@0: #include <stdarg.h>
michael@0: #endif
michael@0: #ifdef _EVENT_HAVE_UNISTD_H
michael@0: #include <unistd.h>
michael@0: #endif
michael@0: 
michael@0: #ifdef WIN32
michael@0: #include <winsock2.h>
michael@0: #include <ws2tcpip.h>
michael@0: #endif
michael@0: 
michael@0: #include <sys/queue.h>
michael@0: 
michael@0: #include "event2/util.h"
michael@0: #include "event2/bufferevent.h"
michael@0: #include "event2/buffer.h"
michael@0: #include "event2/bufferevent_struct.h"
michael@0: #include "event2/event.h"
michael@0: #include "event2/util.h"
michael@0: #include "event-internal.h"
michael@0: #include "log-internal.h"
michael@0: #include "mm-internal.h"
michael@0: #include "bufferevent-internal.h"
michael@0: #include "util-internal.h"
michael@0: #include "iocp-internal.h"
michael@0: 
michael@0: #ifndef SO_UPDATE_CONNECT_CONTEXT
michael@0: /* Mingw is sometimes missing this */
michael@0: #define SO_UPDATE_CONNECT_CONTEXT 0x7010
michael@0: #endif
michael@0: 
michael@0: /* prototypes */
michael@0: static int be_async_enable(struct bufferevent *, short);
michael@0: static int be_async_disable(struct bufferevent *, short);
michael@0: static void be_async_destruct(struct bufferevent *);
michael@0: static int be_async_flush(struct bufferevent *, short, enum bufferevent_flush_mode);
michael@0: static int be_async_ctrl(struct bufferevent *, enum bufferevent_ctrl_op, union bufferevent_ctrl_data *);
michael@0: 
michael@0: struct bufferevent_async {
michael@0: 	struct bufferevent_private bev;
michael@0: 	struct event_overlapped connect_overlapped;
michael@0: 	struct event_overlapped read_overlapped;
michael@0: 	struct event_overlapped write_overlapped;
michael@0: 	size_t read_in_progress;
michael@0: 	size_t write_in_progress;
michael@0: 	unsigned ok : 1;
michael@0: 	unsigned read_added : 1;
michael@0: 	unsigned write_added : 1;
michael@0: };
michael@0: 
michael@0: const struct bufferevent_ops bufferevent_ops_async = {
michael@0: 	"socket_async",
michael@0: 	evutil_offsetof(struct bufferevent_async, bev.bev),
michael@0: 	be_async_enable,
michael@0: 	be_async_disable,
michael@0: 	be_async_destruct,
michael@0: 	_bufferevent_generic_adj_timeouts,
michael@0: 	be_async_flush,
michael@0: 	be_async_ctrl,
michael@0: };
michael@0: 
michael@0: static inline struct bufferevent_async *
michael@0: upcast(struct bufferevent *bev)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a;
michael@0: 	if (bev->be_ops != &bufferevent_ops_async)
michael@0: 		return NULL;
michael@0: 	bev_a = EVUTIL_UPCAST(bev, struct bufferevent_async, bev.bev);
michael@0: 	return bev_a;
michael@0: }
michael@0: 
michael@0: static inline struct bufferevent_async *
michael@0: upcast_connect(struct event_overlapped *eo)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a;
michael@0: 	bev_a = EVUTIL_UPCAST(eo, struct bufferevent_async, connect_overlapped);
michael@0: 	EVUTIL_ASSERT(BEV_IS_ASYNC(&bev_a->bev.bev));
michael@0: 	return bev_a;
michael@0: }
michael@0: 
michael@0: static inline struct bufferevent_async *
michael@0: upcast_read(struct event_overlapped *eo)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a;
michael@0: 	bev_a = EVUTIL_UPCAST(eo, struct bufferevent_async, read_overlapped);
michael@0: 	EVUTIL_ASSERT(BEV_IS_ASYNC(&bev_a->bev.bev));
michael@0: 	return bev_a;
michael@0: }
michael@0: 
michael@0: static inline struct bufferevent_async *
michael@0: upcast_write(struct event_overlapped *eo)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a;
michael@0: 	bev_a = EVUTIL_UPCAST(eo, struct bufferevent_async, write_overlapped);
michael@0: 	EVUTIL_ASSERT(BEV_IS_ASYNC(&bev_a->bev.bev));
michael@0: 	return bev_a;
michael@0: }
michael@0: 
michael@0: static void
michael@0: bev_async_del_write(struct bufferevent_async *beva)
michael@0: {
michael@0: 	struct bufferevent *bev = &beva->bev.bev;
michael@0: 
michael@0: 	if (beva->write_added) {
michael@0: 		beva->write_added = 0;
michael@0: 		event_base_del_virtual(bev->ev_base);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void
michael@0: bev_async_del_read(struct bufferevent_async *beva)
michael@0: {
michael@0: 	struct bufferevent *bev = &beva->bev.bev;
michael@0: 
michael@0: 	if (beva->read_added) {
michael@0: 		beva->read_added = 0;
michael@0: 		event_base_del_virtual(bev->ev_base);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void
michael@0: bev_async_add_write(struct bufferevent_async *beva)
michael@0: {
michael@0: 	struct bufferevent *bev = &beva->bev.bev;
michael@0: 
michael@0: 	if (!beva->write_added) {
michael@0: 		beva->write_added = 1;
michael@0: 		event_base_add_virtual(bev->ev_base);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void
michael@0: bev_async_add_read(struct bufferevent_async *beva)
michael@0: {
michael@0: 	struct bufferevent *bev = &beva->bev.bev;
michael@0: 
michael@0: 	if (!beva->read_added) {
michael@0: 		beva->read_added = 1;
michael@0: 		event_base_add_virtual(bev->ev_base);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void
michael@0: bev_async_consider_writing(struct bufferevent_async *beva)
michael@0: {
michael@0: 	size_t at_most;
michael@0: 	int limit;
michael@0: 	struct bufferevent *bev = &beva->bev.bev;
michael@0: 
michael@0: 	/* Don't write if there's a write in progress, or we do not
michael@0: 	 * want to write, or when there's nothing left to write. */
michael@0: 	if (beva->write_in_progress || beva->bev.connecting)
michael@0: 		return;
michael@0: 	if (!beva->ok || !(bev->enabled&EV_WRITE) ||
michael@0: 	    !evbuffer_get_length(bev->output)) {
michael@0: 		bev_async_del_write(beva);
michael@0: 		return;
michael@0: 	}
michael@0: 
michael@0: 	at_most = evbuffer_get_length(bev->output);
michael@0: 
michael@0: 	/* This is safe so long as bufferevent_get_write_max never returns
michael@0: 	 * more than INT_MAX.  That's true for now. XXXX */
michael@0: 	limit = (int)_bufferevent_get_write_max(&beva->bev);
michael@0: 	if (at_most >= (size_t)limit && limit >= 0)
michael@0: 		at_most = limit;
michael@0: 
michael@0: 	if (beva->bev.write_suspended) {
michael@0: 		bev_async_del_write(beva);
michael@0: 		return;
michael@0: 	}
michael@0: 
michael@0: 	/*  XXXX doesn't respect low-water mark very well. */
michael@0: 	bufferevent_incref(bev);
michael@0: 	if (evbuffer_launch_write(bev->output, at_most,
michael@0: 	    &beva->write_overlapped)) {
michael@0: 		bufferevent_decref(bev);
michael@0: 		beva->ok = 0;
michael@0: 		_bufferevent_run_eventcb(bev, BEV_EVENT_ERROR);
michael@0: 	} else {
michael@0: 		beva->write_in_progress = at_most;
michael@0: 		_bufferevent_decrement_write_buckets(&beva->bev, at_most);
michael@0: 		bev_async_add_write(beva);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void
michael@0: bev_async_consider_reading(struct bufferevent_async *beva)
michael@0: {
michael@0: 	size_t cur_size;
michael@0: 	size_t read_high;
michael@0: 	size_t at_most;
michael@0: 	int limit;
michael@0: 	struct bufferevent *bev = &beva->bev.bev;
michael@0: 
michael@0: 	/* Don't read if there is a read in progress, or we do not
michael@0: 	 * want to read. */
michael@0: 	if (beva->read_in_progress || beva->bev.connecting)
michael@0: 		return;
michael@0: 	if (!beva->ok || !(bev->enabled&EV_READ)) {
michael@0: 		bev_async_del_read(beva);
michael@0: 		return;
michael@0: 	}
michael@0: 
michael@0: 	/* Don't read if we're full */
michael@0: 	cur_size = evbuffer_get_length(bev->input);
michael@0: 	read_high = bev->wm_read.high;
michael@0: 	if (read_high) {
michael@0: 		if (cur_size >= read_high) {
michael@0: 			bev_async_del_read(beva);
michael@0: 			return;
michael@0: 		}
michael@0: 		at_most = read_high - cur_size;
michael@0: 	} else {
michael@0: 		at_most = 16384; /* FIXME totally magic. */
michael@0: 	}
michael@0: 
michael@0: 	/* XXXX This over-commits. */
michael@0: 	/* XXXX see also not above on cast on _bufferevent_get_write_max() */
michael@0: 	limit = (int)_bufferevent_get_read_max(&beva->bev);
michael@0: 	if (at_most >= (size_t)limit && limit >= 0)
michael@0: 		at_most = limit;
michael@0: 
michael@0: 	if (beva->bev.read_suspended) {
michael@0: 		bev_async_del_read(beva);
michael@0: 		return;
michael@0: 	}
michael@0: 
michael@0: 	bufferevent_incref(bev);
michael@0: 	if (evbuffer_launch_read(bev->input, at_most, &beva->read_overlapped)) {
michael@0: 		beva->ok = 0;
michael@0: 		_bufferevent_run_eventcb(bev, BEV_EVENT_ERROR);
michael@0: 		bufferevent_decref(bev);
michael@0: 	} else {
michael@0: 		beva->read_in_progress = at_most;
michael@0: 		_bufferevent_decrement_read_buckets(&beva->bev, at_most);
michael@0: 		bev_async_add_read(beva);
michael@0: 	}
michael@0: 
michael@0: 	return;
michael@0: }
michael@0: 
michael@0: static void
michael@0: be_async_outbuf_callback(struct evbuffer *buf,
michael@0:     const struct evbuffer_cb_info *cbinfo,
michael@0:     void *arg)
michael@0: {
michael@0: 	struct bufferevent *bev = arg;
michael@0: 	struct bufferevent_async *bev_async = upcast(bev);
michael@0: 
michael@0: 	/* If we added data to the outbuf and were not writing before,
michael@0: 	 * we may want to write now. */
michael@0: 
michael@0: 	_bufferevent_incref_and_lock(bev);
michael@0: 
michael@0: 	if (cbinfo->n_added)
michael@0: 		bev_async_consider_writing(bev_async);
michael@0: 
michael@0: 	_bufferevent_decref_and_unlock(bev);
michael@0: }
michael@0: 
michael@0: static void
michael@0: be_async_inbuf_callback(struct evbuffer *buf,
michael@0:     const struct evbuffer_cb_info *cbinfo,
michael@0:     void *arg)
michael@0: {
michael@0: 	struct bufferevent *bev = arg;
michael@0: 	struct bufferevent_async *bev_async = upcast(bev);
michael@0: 
michael@0: 	/* If we drained data from the inbuf and were not reading before,
michael@0: 	 * we may want to read now */
michael@0: 
michael@0: 	_bufferevent_incref_and_lock(bev);
michael@0: 
michael@0: 	if (cbinfo->n_deleted)
michael@0: 		bev_async_consider_reading(bev_async);
michael@0: 
michael@0: 	_bufferevent_decref_and_unlock(bev);
michael@0: }
michael@0: 
michael@0: static int
michael@0: be_async_enable(struct bufferevent *buf, short what)
michael@0: {
michael@0: 	struct bufferevent_async *bev_async = upcast(buf);
michael@0: 
michael@0: 	if (!bev_async->ok)
michael@0: 		return -1;
michael@0: 
michael@0: 	if (bev_async->bev.connecting) {
michael@0: 		/* Don't launch anything during connection attempts. */
michael@0: 		return 0;
michael@0: 	}
michael@0: 
michael@0: 	if (what & EV_READ)
michael@0: 		BEV_RESET_GENERIC_READ_TIMEOUT(buf);
michael@0: 	if (what & EV_WRITE)
michael@0: 		BEV_RESET_GENERIC_WRITE_TIMEOUT(buf);
michael@0: 
michael@0: 	/* If we newly enable reading or writing, and we aren't reading or
michael@0: 	   writing already, consider launching a new read or write. */
michael@0: 
michael@0: 	if (what & EV_READ)
michael@0: 		bev_async_consider_reading(bev_async);
michael@0: 	if (what & EV_WRITE)
michael@0: 		bev_async_consider_writing(bev_async);
michael@0: 	return 0;
michael@0: }
michael@0: 
michael@0: static int
michael@0: be_async_disable(struct bufferevent *bev, short what)
michael@0: {
michael@0: 	struct bufferevent_async *bev_async = upcast(bev);
michael@0: 	/* XXXX If we disable reading or writing, we may want to consider
michael@0: 	 * canceling any in-progress read or write operation, though it might
michael@0: 	 * not work. */
michael@0: 
michael@0: 	if (what & EV_READ) {
michael@0: 		BEV_DEL_GENERIC_READ_TIMEOUT(bev);
michael@0: 		bev_async_del_read(bev_async);
michael@0: 	}
michael@0: 	if (what & EV_WRITE) {
michael@0: 		BEV_DEL_GENERIC_WRITE_TIMEOUT(bev);
michael@0: 		bev_async_del_write(bev_async);
michael@0: 	}
michael@0: 
michael@0: 	return 0;
michael@0: }
michael@0: 
michael@0: static void
michael@0: be_async_destruct(struct bufferevent *bev)
michael@0: {
michael@0: 	struct bufferevent_async *bev_async = upcast(bev);
michael@0: 	struct bufferevent_private *bev_p = BEV_UPCAST(bev);
michael@0: 	evutil_socket_t fd;
michael@0: 
michael@0: 	EVUTIL_ASSERT(!upcast(bev)->write_in_progress &&
michael@0: 			!upcast(bev)->read_in_progress);
michael@0: 
michael@0: 	bev_async_del_read(bev_async);
michael@0: 	bev_async_del_write(bev_async);
michael@0: 
michael@0: 	fd = _evbuffer_overlapped_get_fd(bev->input);
michael@0: 	if (bev_p->options & BEV_OPT_CLOSE_ON_FREE) {
michael@0: 		/* XXXX possible double-close */
michael@0: 		evutil_closesocket(fd);
michael@0: 	}
michael@0: 	/* delete this in case non-blocking connect was used */
michael@0: 	if (event_initialized(&bev->ev_write)) {
michael@0: 		event_del(&bev->ev_write);
michael@0: 		_bufferevent_del_generic_timeout_cbs(bev);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: /* GetQueuedCompletionStatus doesn't reliably yield WSA error codes, so
michael@0:  * we use WSAGetOverlappedResult to translate. */
michael@0: static void
michael@0: bev_async_set_wsa_error(struct bufferevent *bev, struct event_overlapped *eo)
michael@0: {
michael@0: 	DWORD bytes, flags;
michael@0: 	evutil_socket_t fd;
michael@0: 
michael@0: 	fd = _evbuffer_overlapped_get_fd(bev->input);
michael@0: 	WSAGetOverlappedResult(fd, &eo->overlapped, &bytes, FALSE, &flags);
michael@0: }
michael@0: 
michael@0: static int
michael@0: be_async_flush(struct bufferevent *bev, short what,
michael@0:     enum bufferevent_flush_mode mode)
michael@0: {
michael@0: 	return 0;
michael@0: }
michael@0: 
michael@0: static void
michael@0: connect_complete(struct event_overlapped *eo, ev_uintptr_t key,
michael@0:     ev_ssize_t nbytes, int ok)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a = upcast_connect(eo);
michael@0: 	struct bufferevent *bev = &bev_a->bev.bev;
michael@0: 	evutil_socket_t sock;
michael@0: 
michael@0: 	BEV_LOCK(bev);
michael@0: 
michael@0: 	EVUTIL_ASSERT(bev_a->bev.connecting);
michael@0: 	bev_a->bev.connecting = 0;
michael@0: 	sock = _evbuffer_overlapped_get_fd(bev_a->bev.bev.input);
michael@0: 	/* XXXX Handle error? */
michael@0: 	setsockopt(sock, SOL_SOCKET, SO_UPDATE_CONNECT_CONTEXT, NULL, 0);
michael@0: 
michael@0: 	if (ok)
michael@0: 		bufferevent_async_set_connected(bev);
michael@0: 	else
michael@0: 		bev_async_set_wsa_error(bev, eo);
michael@0: 
michael@0: 	_bufferevent_run_eventcb(bev,
michael@0: 			ok? BEV_EVENT_CONNECTED : BEV_EVENT_ERROR);
michael@0: 
michael@0: 	event_base_del_virtual(bev->ev_base);
michael@0: 
michael@0: 	_bufferevent_decref_and_unlock(bev);
michael@0: }
michael@0: 
michael@0: static void
michael@0: read_complete(struct event_overlapped *eo, ev_uintptr_t key,
michael@0:     ev_ssize_t nbytes, int ok)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a = upcast_read(eo);
michael@0: 	struct bufferevent *bev = &bev_a->bev.bev;
michael@0: 	short what = BEV_EVENT_READING;
michael@0: 	ev_ssize_t amount_unread;
michael@0: 	BEV_LOCK(bev);
michael@0: 	EVUTIL_ASSERT(bev_a->read_in_progress);
michael@0: 
michael@0: 	amount_unread = bev_a->read_in_progress - nbytes;
michael@0: 	evbuffer_commit_read(bev->input, nbytes);
michael@0: 	bev_a->read_in_progress = 0;
michael@0: 	if (amount_unread)
michael@0: 		_bufferevent_decrement_read_buckets(&bev_a->bev, -amount_unread);
michael@0: 
michael@0: 	if (!ok)
michael@0: 		bev_async_set_wsa_error(bev, eo);
michael@0: 
michael@0: 	if (bev_a->ok) {
michael@0: 		if (ok && nbytes) {
michael@0: 			BEV_RESET_GENERIC_READ_TIMEOUT(bev);
michael@0: 			if (evbuffer_get_length(bev->input) >= bev->wm_read.low)
michael@0: 				_bufferevent_run_readcb(bev);
michael@0: 			bev_async_consider_reading(bev_a);
michael@0: 		} else if (!ok) {
michael@0: 			what |= BEV_EVENT_ERROR;
michael@0: 			bev_a->ok = 0;
michael@0: 			_bufferevent_run_eventcb(bev, what);
michael@0: 		} else if (!nbytes) {
michael@0: 			what |= BEV_EVENT_EOF;
michael@0: 			bev_a->ok = 0;
michael@0: 			_bufferevent_run_eventcb(bev, what);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	_bufferevent_decref_and_unlock(bev);
michael@0: }
michael@0: 
michael@0: static void
michael@0: write_complete(struct event_overlapped *eo, ev_uintptr_t key,
michael@0:     ev_ssize_t nbytes, int ok)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a = upcast_write(eo);
michael@0: 	struct bufferevent *bev = &bev_a->bev.bev;
michael@0: 	short what = BEV_EVENT_WRITING;
michael@0: 	ev_ssize_t amount_unwritten;
michael@0: 
michael@0: 	BEV_LOCK(bev);
michael@0: 	EVUTIL_ASSERT(bev_a->write_in_progress);
michael@0: 
michael@0: 	amount_unwritten = bev_a->write_in_progress - nbytes;
michael@0: 	evbuffer_commit_write(bev->output, nbytes);
michael@0: 	bev_a->write_in_progress = 0;
michael@0: 
michael@0: 	if (amount_unwritten)
michael@0: 		_bufferevent_decrement_write_buckets(&bev_a->bev,
michael@0: 		                                     -amount_unwritten);
michael@0: 
michael@0: 
michael@0: 	if (!ok)
michael@0: 		bev_async_set_wsa_error(bev, eo);
michael@0: 
michael@0: 	if (bev_a->ok) {
michael@0: 		if (ok && nbytes) {
michael@0: 			BEV_RESET_GENERIC_WRITE_TIMEOUT(bev);
michael@0: 			if (evbuffer_get_length(bev->output) <=
michael@0: 			    bev->wm_write.low)
michael@0: 				_bufferevent_run_writecb(bev);
michael@0: 			bev_async_consider_writing(bev_a);
michael@0: 		} else if (!ok) {
michael@0: 			what |= BEV_EVENT_ERROR;
michael@0: 			bev_a->ok = 0;
michael@0: 			_bufferevent_run_eventcb(bev, what);
michael@0: 		} else if (!nbytes) {
michael@0: 			what |= BEV_EVENT_EOF;
michael@0: 			bev_a->ok = 0;
michael@0: 			_bufferevent_run_eventcb(bev, what);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	_bufferevent_decref_and_unlock(bev);
michael@0: }
michael@0: 
michael@0: struct bufferevent *
michael@0: bufferevent_async_new(struct event_base *base,
michael@0:     evutil_socket_t fd, int options)
michael@0: {
michael@0: 	struct bufferevent_async *bev_a;
michael@0: 	struct bufferevent *bev;
michael@0: 	struct event_iocp_port *iocp;
michael@0: 
michael@0: 	options |= BEV_OPT_THREADSAFE;
michael@0: 
michael@0: 	if (!(iocp = event_base_get_iocp(base)))
michael@0: 		return NULL;
michael@0: 
michael@0: 	if (fd >= 0 && event_iocp_port_associate(iocp, fd, 1)<0) {
michael@0: 		int err = GetLastError();
michael@0: 		/* We may have alrady associated this fd with a port.
michael@0: 		 * Let's hope it's this port, and that the error code
michael@0: 		 * for doing this neer changes. */
michael@0: 		if (err != ERROR_INVALID_PARAMETER)
michael@0: 			return NULL;
michael@0: 	}
michael@0: 
michael@0: 	if (!(bev_a = mm_calloc(1, sizeof(struct bufferevent_async))))
michael@0: 		return NULL;
michael@0: 
michael@0: 	bev = &bev_a->bev.bev;
michael@0: 	if (!(bev->input = evbuffer_overlapped_new(fd))) {
michael@0: 		mm_free(bev_a);
michael@0: 		return NULL;
michael@0: 	}
michael@0: 	if (!(bev->output = evbuffer_overlapped_new(fd))) {
michael@0: 		evbuffer_free(bev->input);
michael@0: 		mm_free(bev_a);
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	if (bufferevent_init_common(&bev_a->bev, base, &bufferevent_ops_async,
michael@0: 		options)<0)
michael@0: 		goto err;
michael@0: 
michael@0: 	evbuffer_add_cb(bev->input, be_async_inbuf_callback, bev);
michael@0: 	evbuffer_add_cb(bev->output, be_async_outbuf_callback, bev);
michael@0: 
michael@0: 	event_overlapped_init(&bev_a->connect_overlapped, connect_complete);
michael@0: 	event_overlapped_init(&bev_a->read_overlapped, read_complete);
michael@0: 	event_overlapped_init(&bev_a->write_overlapped, write_complete);
michael@0: 
michael@0: 	bev_a->ok = fd >= 0;
michael@0: 	if (bev_a->ok)
michael@0: 		_bufferevent_init_generic_timeout_cbs(bev);
michael@0: 
michael@0: 	return bev;
michael@0: err:
michael@0: 	bufferevent_free(&bev_a->bev.bev);
michael@0: 	return NULL;
michael@0: }
michael@0: 
michael@0: void
michael@0: bufferevent_async_set_connected(struct bufferevent *bev)
michael@0: {
michael@0: 	struct bufferevent_async *bev_async = upcast(bev);
michael@0: 	bev_async->ok = 1;
michael@0: 	_bufferevent_init_generic_timeout_cbs(bev);
michael@0: 	/* Now's a good time to consider reading/writing */
michael@0: 	be_async_enable(bev, bev->enabled);
michael@0: }
michael@0: 
michael@0: int
michael@0: bufferevent_async_can_connect(struct bufferevent *bev)
michael@0: {
michael@0: 	const struct win32_extension_fns *ext =
michael@0: 	    event_get_win32_extension_fns();
michael@0: 
michael@0: 	if (BEV_IS_ASYNC(bev) &&
michael@0: 	    event_base_get_iocp(bev->ev_base) &&
michael@0: 	    ext && ext->ConnectEx)
michael@0: 		return 1;
michael@0: 
michael@0: 	return 0;
michael@0: }
michael@0: 
michael@0: int
michael@0: bufferevent_async_connect(struct bufferevent *bev, evutil_socket_t fd,
michael@0: 	const struct sockaddr *sa, int socklen)
michael@0: {
michael@0: 	BOOL rc;
michael@0: 	struct bufferevent_async *bev_async = upcast(bev);
michael@0: 	struct sockaddr_storage ss;
michael@0: 	const struct win32_extension_fns *ext =
michael@0: 	    event_get_win32_extension_fns();
michael@0: 
michael@0: 	EVUTIL_ASSERT(ext && ext->ConnectEx && fd >= 0 && sa != NULL);
michael@0: 
michael@0: 	/* ConnectEx() requires that the socket be bound to an address
michael@0: 	 * with bind() before using, otherwise it will fail. We attempt
michael@0: 	 * to issue a bind() here, taking into account that the error
michael@0: 	 * code is set to WSAEINVAL when the socket is already bound. */
michael@0: 	memset(&ss, 0, sizeof(ss));
michael@0: 	if (sa->sa_family == AF_INET) {
michael@0: 		struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
michael@0: 		sin->sin_family = AF_INET;
michael@0: 		sin->sin_addr.s_addr = INADDR_ANY;
michael@0: 	} else if (sa->sa_family == AF_INET6) {
michael@0: 		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
michael@0: 		sin6->sin6_family = AF_INET6;
michael@0: 		sin6->sin6_addr = in6addr_any;
michael@0: 	} else {
michael@0: 		/* Well, the user will have to bind() */
michael@0: 		return -1;
michael@0: 	}
michael@0: 	if (bind(fd, (struct sockaddr *)&ss, sizeof(ss)) < 0 &&
michael@0: 	    WSAGetLastError() != WSAEINVAL)
michael@0: 		return -1;
michael@0: 
michael@0: 	event_base_add_virtual(bev->ev_base);
michael@0: 	bufferevent_incref(bev);
michael@0: 	rc = ext->ConnectEx(fd, sa, socklen, NULL, 0, NULL,
michael@0: 			    &bev_async->connect_overlapped.overlapped);
michael@0: 	if (rc || WSAGetLastError() == ERROR_IO_PENDING)
michael@0: 		return 0;
michael@0: 
michael@0: 	event_base_del_virtual(bev->ev_base);
michael@0: 	bufferevent_decref(bev);
michael@0: 
michael@0: 	return -1;
michael@0: }
michael@0: 
michael@0: static int
michael@0: be_async_ctrl(struct bufferevent *bev, enum bufferevent_ctrl_op op,
michael@0:     union bufferevent_ctrl_data *data)
michael@0: {
michael@0: 	switch (op) {
michael@0: 	case BEV_CTRL_GET_FD:
michael@0: 		data->fd = _evbuffer_overlapped_get_fd(bev->input);
michael@0: 		return 0;
michael@0: 	case BEV_CTRL_SET_FD: {
michael@0: 		struct event_iocp_port *iocp;
michael@0: 
michael@0: 		if (data->fd == _evbuffer_overlapped_get_fd(bev->input))
michael@0: 			return 0;
michael@0: 		if (!(iocp = event_base_get_iocp(bev->ev_base)))
michael@0: 			return -1;
michael@0: 		if (event_iocp_port_associate(iocp, data->fd, 1) < 0)
michael@0: 			return -1;
michael@0: 		_evbuffer_overlapped_set_fd(bev->input, data->fd);
michael@0: 		_evbuffer_overlapped_set_fd(bev->output, data->fd);
michael@0: 		return 0;
michael@0: 	}
michael@0: 	case BEV_CTRL_CANCEL_ALL: {
michael@0: 		struct bufferevent_async *bev_a = upcast(bev);
michael@0: 		evutil_socket_t fd = _evbuffer_overlapped_get_fd(bev->input);
michael@0: 		if (fd != (evutil_socket_t)INVALID_SOCKET &&
michael@0: 		    (bev_a->bev.options & BEV_OPT_CLOSE_ON_FREE)) {
michael@0: 			closesocket(fd);
michael@0: 		}
michael@0: 		bev_a->ok = 0;
michael@0: 		return 0;
michael@0: 	}
michael@0: 	case BEV_CTRL_GET_UNDERLYING:
michael@0: 	default:
michael@0: 		return -1;
michael@0: 	}
michael@0: }
michael@0: 
michael@0: