Import pop3d.

1 files changed, 910 insertions, 0 deletions

diff --git a/ioev.c b/ioev.c
new file mode 100644
index 0000000..5ed5148
--- /dev/null
+++ b/ioev.c
@@ -0,0 +1,910 @@
+/*	$OpenBSD: ioev.c,v 1.1 2014/01/27 15:49:52 sunil Exp $	*/
+
+/*      
+ * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "ioev.h"
+#include "iobuf.h"
+
+#ifdef IO_SSL
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+#endif
+
+enum {
+	IO_STATE_NONE,
+	IO_STATE_CONNECT,
+	IO_STATE_CONNECT_SSL,
+	IO_STATE_ACCEPT_SSL,
+	IO_STATE_UP,
+
+	IO_STATE_MAX,
+};
+
+const char* io_strflags(int);
+const char* io_evstr(short);
+
+void	_io_init(void);
+void	io_hold(struct io *);
+void	io_release(struct io *);
+void	io_callback(struct io*, int);
+void	io_dispatch(int, short, void *);
+void	io_dispatch_connect(int, short, void *);
+size_t	io_pending(struct io *);
+size_t	io_queued(struct io*);
+void	io_reset(struct io *, short, void (*)(int, short, void*));
+void	io_frame_enter(const char *, struct io *, int);
+void	io_frame_leave(struct io *);
+
+#ifdef IO_SSL
+void	ssl_error(const char *); /* XXX external */
+
+static const char* io_ssl_error(void);
+void	io_dispatch_accept_ssl(int, short, void *);
+void	io_dispatch_connect_ssl(int, short, void *);
+void	io_dispatch_read_ssl(int, short, void *);
+void	io_dispatch_write_ssl(int, short, void *);
+void	io_reload_ssl(struct io *io);
+#endif
+
+static struct io	*current = NULL;
+static uint64_t		 frame = 0;
+static int		_io_debug = 0;
+
+#define io_debug(args...) do { if (_io_debug) printf(args); } while(0)
+
+
+const char*
+io_strio(struct io *io)
+{
+	static char	buf[128];
+	char		ssl[128];
+
+	ssl[0] = '\0';
+#ifdef IO_SSL
+	if (io->ssl) {
+		snprintf(ssl, sizeof ssl, " ssl=%s:%s:%i",
+		    SSL_get_cipher_version(io->ssl),
+		    SSL_get_cipher_name(io->ssl),
+		    SSL_get_cipher_bits(io->ssl, NULL));
+	}
+#endif
+
+	if (io->iobuf == NULL)
+		snprintf(buf, sizeof buf,
+		    "<io:%p fd=%i to=%i fl=%s%s>",
+		    io, io->sock, io->timeout, io_strflags(io->flags), ssl);
+	else
+		snprintf(buf, sizeof buf,
+		    "<io:%p fd=%i to=%i fl=%s%s ib=%zu ob=%zu>",
+		    io, io->sock, io->timeout, io_strflags(io->flags), ssl,
+		    io_pending(io), io_queued(io));
+
+	return (buf);
+}
+
+#define CASE(x) case x : return #x
+
+const char*
+io_strevent(int evt)
+{
+	static char buf[32];
+
+	switch (evt) {
+	CASE(IO_CONNECTED);
+	CASE(IO_TLSREADY);
+	CASE(IO_TLSVERIFIED);
+	CASE(IO_DATAIN);
+	CASE(IO_LOWAT);
+	CASE(IO_DISCONNECTED);
+	CASE(IO_TIMEOUT);
+	CASE(IO_ERROR);
+	default:
+		snprintf(buf, sizeof(buf), "IO_? %i", evt);
+		return buf;
+	}
+}
+
+void
+io_set_blocking(int fd, int blocking)
+{
+	int	flags;
+
+	if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
+		err(1, "io_set_blocking:fcntl(F_GETFL)");
+
+	if (blocking)
+		flags &= ~O_NONBLOCK;
+	else
+		flags |= O_NONBLOCK;
+
+	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
+		err(1, "io_set_blocking:fcntl(F_SETFL)");
+}
+
+void
+io_set_linger(int fd, int linger)
+{
+	struct linger    l;
+
+	bzero(&l, sizeof(l));
+	l.l_onoff = linger ? 1 : 0;
+	l.l_linger = linger;
+	if (setsockopt(fd, SOL_SOCKET, SO_LINGER, &l, sizeof(l)) == -1)
+		err(1, "io_set_linger:setsockopt()");
+}
+
+/*
+ * Event framing must not rely on an io pointer to refer to the "same" io
+ * throughout the frame, beacuse this is not always the case:
+ *
+ * 1) enter(addr0) -> free(addr0) -> leave(addr0) = SEGV
+ * 2) enter(addr0) -> free(addr0) -> malloc == addr0 -> leave(addr0) = BAD!
+ *
+ * In both case, the problem is that the io is freed in the callback, so
+ * the pointer becomes invalid. If that happens, the user is required to
+ * call io_clear, so we can adapt the frame state there.
+ */
+void
+io_frame_enter(const char *where, struct io *io, int ev)
+{
+	io_debug("\n=== %" PRIu64 " ===\n"
+	    "io_frame_enter(%s, %s, %s)\n",
+	    frame, where, io_evstr(ev), io_strio(io));
+
+	if (current)
+		errx(1, "io_frame_enter: interleaved frames");
+
+	current = io;
+
+	io_hold(io);
+}
+
+void
+io_frame_leave(struct io *io)
+{
+	io_debug("io_frame_leave(%" PRIu64 ")\n", frame);
+
+	if (current && current != io)
+		errx(1, "io_frame_leave: io mismatch");
+
+	/* io has been cleared */
+	if (current == NULL)
+		goto done;
+
+	/* TODO: There is a possible optimization there:
+	 * In a typical half-duplex request/response scenario,
+	 * the io is waiting to read a request, and when done, it queues
+	 * the response in the output buffer and goes to write mode.
+	 * There, the write event is set and will be triggered in the next
+	 * event frame.  In most case, the write call could be done
+	 * immediatly as part of the last read frame, thus avoiding to go
+	 * through the event loop machinery. So, as an optimisation, we
+	 * could detect that case here and force an event dispatching.
+	 */
+
+	/* Reload the io if it has not been reset already. */
+	io_release(io);
+	current = NULL;
+    done:
+	io_debug("=== /%" PRIu64 "\n", frame);
+
+	frame += 1;
+}
+
+void
+_io_init()
+{
+	static int init = 0;
+
+	if (init)
+		return;
+
+	init = 1;
+	_io_debug = getenv("IO_DEBUG") != NULL;
+}
+
+void
+io_init(struct io *io, int sock, void *arg,
+	void(*cb)(struct io*, int), struct iobuf *iobuf)
+{
+	_io_init();
+
+	memset(io, 0, sizeof *io);
+
+	io->sock = sock;
+	io->timeout = -1;
+	io->arg = arg;
+	io->iobuf = iobuf;
+	io->cb = cb;
+
+	if (sock != -1)
+		io_reload(io);
+}
+
+void
+io_clear(struct io *io)
+{
+	io_debug("io_clear(%p)\n", io);
+
+	/* the current io is virtually dead */
+	if (io == current)
+		current = NULL;
+
+#ifdef IO_SSL
+	if (io->ssl) {
+		SSL_shutdown(io->ssl);
+		SSL_free(io->ssl);
+		io->ssl = NULL;
+	}
+#endif
+
+	event_del(&io->ev);
+	if (io->sock != -1) {
+		close(io->sock);
+		io->sock = -1;
+	}
+}
+
+void
+io_hold(struct io *io)
+{
+	io_debug("io_enter(%p)\n", io);
+
+	if (io->flags & IO_HELD)
+		errx(1, "io_hold: io is already held");
+
+	io->flags &= ~IO_RESET;
+	io->flags |= IO_HELD;
+}
+
+void
+io_release(struct io *io)
+{
+	if (!(io->flags & IO_HELD))
+		errx(1, "io_release: io is not held");
+
+	io->flags &= ~IO_HELD;
+	if (!(io->flags & IO_RESET))
+		io_reload(io);
+}
+
+void
+io_set_timeout(struct io *io, int msec)
+{
+	io_debug("io_set_timeout(%p, %i)\n", io, msec);
+
+	io->timeout = msec;
+}
+
+void
+io_set_lowat(struct io *io, size_t lowat)
+{
+	io_debug("io_set_lowat(%p, %zu)\n", io, lowat);
+
+	io->lowat = lowat;
+}
+
+void
+io_pause(struct io *io, int dir)
+{
+	io_debug("io_pause(%p, %x)\n", io, dir);
+
+	io->flags |= dir & (IO_PAUSE_IN | IO_PAUSE_OUT);
+	io_reload(io);
+}
+
+void
+io_resume(struct io *io, int dir)
+{
+	io_debug("io_resume(%p, %x)\n", io, dir);
+
+	io->flags &= ~(dir & (IO_PAUSE_IN | IO_PAUSE_OUT));
+	io_reload(io);
+}
+
+void
+io_set_read(struct io *io)
+{
+	int	mode;
+
+	io_debug("io_set_read(%p)\n", io);
+
+	mode = io->flags & IO_RW;
+	if (!(mode == 0 || mode == IO_WRITE))
+		errx(1, "io_set_read(): full-duplex or reading");
+
+	io->flags &= ~IO_RW;
+	io->flags |= IO_READ;
+	io_reload(io);
+}
+
+void
+io_set_write(struct io *io)
+{
+	int	mode;
+
+	io_debug("io_set_write(%p)\n", io);
+
+	mode = io->flags & IO_RW;
+	if (!(mode == 0 || mode == IO_READ))
+		errx(1, "io_set_write(): full-duplex or writing");
+
+	io->flags &= ~IO_RW;
+	io->flags |= IO_WRITE;
+	io_reload(io);
+}
+
+#define IO_READING(io) (((io)->flags & IO_RW) != IO_WRITE)
+#define IO_WRITING(io) (((io)->flags & IO_RW) != IO_READ)
+
+/*
+ * Setup the necessary events as required by the current io state,
+ * honouring duplex mode and i/o pauses.
+ */
+void
+io_reload(struct io *io)
+{
+	short	events;
+
+	/* io will be reloaded at release time */
+	if (io->flags & IO_HELD)
+		return;
+
+#ifdef IO_SSL
+	if (io->ssl) {
+		io_reload_ssl(io);
+		return;
+	}
+#endif
+
+	io_debug("io_reload(%p)\n", io);
+
+	events = 0;
+	if (IO_READING(io) && !(io->flags & IO_PAUSE_IN))
+		events = EV_READ;
+	if (IO_WRITING(io) && !(io->flags & IO_PAUSE_OUT) && io_queued(io))
+		events |= EV_WRITE;
+
+	io_reset(io, events, io_dispatch);
+}
+
+/* Set the requested event. */
+void
+io_reset(struct io *io, short events, void (*dispatch)(int, short, void*))
+{
+	struct timeval	tv, *ptv;
+
+	io_debug("io_reset(%p, %s, %p) -> %s\n",
+	    io, io_evstr(events), dispatch, io_strio(io));
+
+	/*
+	 * Indicate that the event has already been reset so that reload
+	 * is not called on frame_leave.
+	 */
+	io->flags |= IO_RESET;
+
+	event_del(&io->ev);
+
+	/*
+	 * The io is paused by the user, so we don't want the timeout to be
+	 * effective.
+	 */
+	if (events == 0)
+		return;
+
+	event_set(&io->ev, io->sock, events, dispatch, io);
+	if (io->timeout >= 0) {
+		tv.tv_sec = io->timeout / 1000;
+		tv.tv_usec = (io->timeout % 1000) * 1000;
+		ptv = &tv;
+	} else
+		ptv = NULL;
+
+	event_add(&io->ev, ptv);
+}
+
+size_t
+io_pending(struct io *io)
+{
+	return iobuf_len(io->iobuf);
+}
+
+size_t
+io_queued(struct io *io)
+{
+	return iobuf_queued(io->iobuf);
+}
+
+const char*
+io_strflags(int flags)
+{
+	static char	buf[64];
+
+	buf[0] = '\0';
+
+	switch (flags & IO_RW) {
+	case 0:
+		strlcat(buf, "rw", sizeof buf);
+		break;
+	case IO_READ:
+		strlcat(buf, "R", sizeof buf);
+		break;
+	case IO_WRITE:
+		strlcat(buf, "W", sizeof buf);
+		break;
+	case IO_RW:
+		strlcat(buf, "RW", sizeof buf);
+		break;
+	}
+
+	if (flags & IO_PAUSE_IN)
+		strlcat(buf, ",F_PI", sizeof buf);
+	if (flags & IO_PAUSE_OUT)
+		strlcat(buf, ",F_PO", sizeof buf);
+
+	return buf;
+}
+
+const char*
+io_evstr(short ev)
+{
+	static char	buf[64];
+	char		buf2[16];
+	int		n;
+
+	n = 0;
+	buf[0] = '\0';
+
+	if (ev == 0) {
+		strlcat(buf, "<NONE>", sizeof(buf));
+		return buf;
+	}
+
+	if (ev & EV_TIMEOUT) {
+		strlcat(buf, "EV_TIMEOUT", sizeof(buf));
+		ev &= ~EV_TIMEOUT;
+		n++;
+	}
+
+	if (ev & EV_READ) {
+		if (n)
+			strlcat(buf, "|", sizeof(buf));
+		strlcat(buf, "EV_READ", sizeof(buf));
+		ev &= ~EV_READ;
+		n++;
+	}
+
+	if (ev & EV_WRITE) {
+		if (n)
+			strlcat(buf, "|", sizeof(buf));
+		strlcat(buf, "EV_WRITE", sizeof(buf));
+		ev &= ~EV_WRITE;
+		n++;
+	}
+
+	if (ev & EV_SIGNAL) {
+		if (n)
+			strlcat(buf, "|", sizeof(buf));
+		strlcat(buf, "EV_SIGNAL", sizeof(buf));
+		ev &= ~EV_SIGNAL;
+		n++;
+	}
+
+	if (ev) {
+		if (n)
+			strlcat(buf, "|", sizeof(buf));
+		strlcat(buf, "EV_?=0x", sizeof(buf));
+		snprintf(buf2, sizeof(buf2), "%hx", ev);
+		strlcat(buf, buf2, sizeof(buf));
+	}
+
+	return buf;
+}
+
+void
+io_dispatch(int fd, short ev, void *humppa)
+{
+	struct io	*io = humppa;
+	size_t		 w;
+	ssize_t		 n;
+	int		 saved_errno;
+
+	io_frame_enter("io_dispatch", io, ev);
+
+	if (ev == EV_TIMEOUT) {
+		io_callback(io, IO_TIMEOUT);
+		goto leave;
+	}
+
+	if (ev & EV_WRITE && (w = io_queued(io))) {
+		if ((n = iobuf_write(io->iobuf, io->sock)) < 0) {
+			if (n == IOBUF_WANT_WRITE) /* kqueue bug? */
+				goto read;
+			if (n == IOBUF_CLOSED)
+				io_callback(io, IO_DISCONNECTED);
+			else {
+				saved_errno = errno;
+				io->error = strerror(errno);
+				errno = saved_errno;
+				io_callback(io, IO_ERROR);
+			}
+			goto leave;
+		}
+		if (w > io->lowat && w - n <= io->lowat)
+			io_callback(io, IO_LOWAT);
+	}
+    read:
+
+	if (ev & EV_READ) {
+		if ((n = iobuf_read(io->iobuf, io->sock)) < 0) {
+			if (n == IOBUF_CLOSED)
+				io_callback(io, IO_DISCONNECTED);
+			else {
+				saved_errno = errno;
+				io->error = strerror(errno);
+				errno = saved_errno;
+				io_callback(io, IO_ERROR);
+			}
+			goto leave;
+		}
+		if (n)
+			io_callback(io, IO_DATAIN);
+	}
+
+leave:
+	io_frame_leave(io);
+}
+
+void
+io_callback(struct io *io, int evt)
+{
+	io->cb(io, evt);
+}
+
+int
+io_connect(struct io *io, const struct sockaddr *sa, const struct sockaddr *bsa)
+{
+	int	sock, errno_save;
+
+	if ((sock = socket(sa->sa_family, SOCK_STREAM, 0)) == -1)
+		goto fail;
+
+	io_set_blocking(sock, 0);
+	io_set_linger(sock, 0);
+
+	if (bsa && bind(sock, bsa, bsa->sa_len) == -1)
+		goto fail;
+
+	if (connect(sock, sa, sa->sa_len) == -1)
+		if (errno != EINPROGRESS)
+			goto fail;
+
+	io->sock = sock;
+	io_reset(io, EV_WRITE, io_dispatch_connect);
+
+	return (sock);
+
+    fail:
+	if (sock != -1) {
+		errno_save = errno;
+		close(sock);
+		errno = errno_save;
+		io->error = strerror(errno);
+	}
+	return (-1);
+}
+
+void
+io_dispatch_connect(int fd, short ev, void *humppa)
+{
+	struct io	*io = humppa;
+	int		 r, e;
+	socklen_t	 sl;
+
+	io_frame_enter("io_dispatch_connect", io, ev);
+
+	if (ev == EV_TIMEOUT) {
+		close(fd);
+		io->sock = -1;
+		io_callback(io, IO_TIMEOUT);
+	} else {
+		sl = sizeof(e);
+		r = getsockopt(fd, SOL_SOCKET, SO_ERROR, &e, &sl);
+		if (r == -1)  {
+			warn("io_dispatch_connect: getsockopt");
+			e = errno;
+		}
+		if (e) {
+			close(fd);
+			io->sock = -1;
+			io->error = strerror(e);
+			io_callback(io, e == ETIMEDOUT ? IO_TIMEOUT : IO_ERROR);
+		}
+		else {
+			io->state = IO_STATE_UP;
+			io_callback(io, IO_CONNECTED);
+		}
+	}
+
+	io_frame_leave(io);
+}
+
+#ifdef IO_SSL
+
+static const char*
+io_ssl_error(void)
+{
+	static char	buf[128];
+	unsigned long	e;
+
+	e = ERR_peek_last_error();
+	if (e) {
+		ERR_error_string(e, buf);
+		return (buf);
+	}
+
+	return ("No SSL error");
+}
+
+int
+io_start_tls(struct io *io, void *ssl)
+{
+	int	mode;
+
+	mode = io->flags & IO_RW;
+	if (mode == 0 || mode == IO_RW)
+		errx(1, "io_start_tls(): full-duplex or unset");
+
+	if (io->ssl)
+		errx(1, "io_start_tls(): SSL already started");
+	io->ssl = ssl;
+
+	if (SSL_set_fd(io->ssl, io->sock) == 0) {
+		ssl_error("io_start_ssl:SSL_set_fd");
+		return (-1);
+	}
+
+	if (mode == IO_WRITE) {
+		io->state = IO_STATE_CONNECT_SSL;
+		SSL_set_connect_state(io->ssl);
+		io_reset(io, EV_WRITE, io_dispatch_connect_ssl);
+	} else {
+		io->state = IO_STATE_ACCEPT_SSL;
+		SSL_set_accept_state(io->ssl);
+		io_reset(io, EV_READ, io_dispatch_accept_ssl);
+	}
+
+	return (0);
+}
+
+void
+io_dispatch_accept_ssl(int fd, short event, void *humppa)
+{
+	struct io	*io = humppa;
+	int		 e, ret;
+
+	io_frame_enter("io_dispatch_accept_ssl", io, event);
+
+	if (event == EV_TIMEOUT) {
+		io_callback(io, IO_TIMEOUT);
+		goto leave;
+	}
+
+	if ((ret = SSL_accept(io->ssl)) > 0) {
+		io->state = IO_STATE_UP;
+		io_callback(io, IO_TLSREADY);
+		goto leave;
+	}
+
+	switch ((e = SSL_get_error(io->ssl, ret))) {
+	case SSL_ERROR_WANT_READ:
+		io_reset(io, EV_READ, io_dispatch_accept_ssl);
+		break;
+	case SSL_ERROR_WANT_WRITE:
+		io_reset(io, EV_WRITE, io_dispatch_accept_ssl);
+		break;
+	default:
+		io->error = io_ssl_error();
+		ssl_error("io_dispatch_accept_ssl:SSL_accept");
+		io_callback(io, IO_ERROR);
+		break;
+	}
+
+    leave:
+	io_frame_leave(io);
+}
+
+void
+io_dispatch_connect_ssl(int fd, short event, void *humppa)
+{
+	struct io	*io = humppa;
+	int		 e, ret;
+
+	io_frame_enter("io_dispatch_connect_ssl", io, event);
+
+	if (event == EV_TIMEOUT) {
+		io_callback(io, IO_TIMEOUT);
+		goto leave;
+	}
+
+	if ((ret = SSL_connect(io->ssl)) > 0) {
+		io->state = IO_STATE_UP;
+		io_callback(io, IO_TLSREADY);
+		goto leave;
+	}
+
+	switch ((e = SSL_get_error(io->ssl, ret))) {
+	case SSL_ERROR_WANT_READ:
+		io_reset(io, EV_READ, io_dispatch_connect_ssl);
+		break;
+	case SSL_ERROR_WANT_WRITE:
+		io_reset(io, EV_WRITE, io_dispatch_connect_ssl);
+		break;
+	default:
+		io->error = io_ssl_error();
+		ssl_error("io_dispatch_connect_ssl:SSL_connect");
+		io_callback(io, IO_ERROR);
+		break;
+	}
+
+    leave:
+	io_frame_leave(io);
+}
+
+void
+io_dispatch_read_ssl(int fd, short event, void *humppa)
+{
+	struct io	*io = humppa;
+	int		 n, saved_errno;
+
+	io_frame_enter("io_dispatch_read_ssl", io, event);
+
+	if (event == EV_TIMEOUT) {
+		io_callback(io, IO_TIMEOUT);
+		goto leave;
+	}
+
+again:
+	switch ((n = iobuf_read_ssl(io->iobuf, (SSL*)io->ssl))) {
+	case IOBUF_WANT_READ:
+		io_reset(io, EV_READ, io_dispatch_read_ssl);
+		break;
+	case IOBUF_WANT_WRITE:
+		io_reset(io, EV_WRITE, io_dispatch_read_ssl);
+		break;
+	case IOBUF_CLOSED:
+		io_callback(io, IO_DISCONNECTED);
+		break;
+	case IOBUF_ERROR:
+		saved_errno = errno;
+		io->error = strerror(errno);
+		errno = saved_errno;
+		io_callback(io, IO_ERROR);
+		break;
+	case IOBUF_SSLERROR:
+		io->error = io_ssl_error();
+		ssl_error("io_dispatch_read_ssl:SSL_read");
+		io_callback(io, IO_ERROR);
+		break;
+	default:
+		io_debug("io_dispatch_read_ssl(...) -> r=%i\n", n);
+		io_callback(io, IO_DATAIN);
+		if (current == io && IO_READING(io) && SSL_pending(io->ssl))
+			goto again;
+	}
+
+    leave:
+	io_frame_leave(io);
+}
+
+void
+io_dispatch_write_ssl(int fd, short event, void *humppa)
+{
+	struct io	*io = humppa;
+	int		 n, saved_errno;
+	size_t		 w2, w;
+
+	io_frame_enter("io_dispatch_write_ssl", io, event);
+
+	if (event == EV_TIMEOUT) {
+		io_callback(io, IO_TIMEOUT);
+		goto leave;
+	}
+
+	w = io_queued(io);
+	switch ((n = iobuf_write_ssl(io->iobuf, (SSL*)io->ssl))) {
+	case IOBUF_WANT_READ:
+		io_reset(io, EV_READ, io_dispatch_write_ssl);
+		break;
+	case IOBUF_WANT_WRITE:
+		io_reset(io, EV_WRITE, io_dispatch_write_ssl);
+		break;
+	case IOBUF_CLOSED:
+		io_callback(io, IO_DISCONNECTED);
+		break;
+	case IOBUF_ERROR:
+		saved_errno = errno;
+		io->error = strerror(errno);
+		errno = saved_errno;
+		io_callback(io, IO_ERROR);
+		break;
+	case IOBUF_SSLERROR:
+		io->error = io_ssl_error();
+		ssl_error("io_dispatch_write_ssl:SSL_write");
+		io_callback(io, IO_ERROR);
+		break;
+	default:
+		io_debug("io_dispatch_write_ssl(...) -> w=%i\n", n);
+		w2 = io_queued(io);
+		if (w > io->lowat && w2 <= io->lowat)
+			io_callback(io, IO_LOWAT);
+		break;
+	}
+
+    leave:
+	io_frame_leave(io);
+}
+
+void
+io_reload_ssl(struct io *io)
+{
+	short	ev = 0;
+	void	(*dispatch)(int, short, void*) = NULL;
+
+	switch (io->state) {
+	case IO_STATE_CONNECT_SSL:
+		ev = EV_WRITE;
+		dispatch = io_dispatch_connect_ssl;
+		break;
+	case IO_STATE_ACCEPT_SSL:
+		ev = EV_READ;
+		dispatch = io_dispatch_accept_ssl;
+		break;
+	case IO_STATE_UP:
+		ev = 0;
+		if (IO_READING(io) && !(io->flags & IO_PAUSE_IN)) {
+			ev = EV_READ;
+			dispatch = io_dispatch_read_ssl;
+		}
+		else if (IO_WRITING(io) && !(io->flags & IO_PAUSE_OUT) && io_queued(io)) {
+			ev = EV_WRITE;
+			dispatch = io_dispatch_write_ssl;
+		}
+		if (! ev)
+			return; /* paused */
+		break;
+	default:
+		errx(1, "io_reload_ssl(): bad state");
+	}
+
+	io_reset(io, ev, dispatch);
+}
+
+#endif /* IO_SSL */