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asyncio.c
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/******************************************************************************
* Copyright (C) 2013 - 2014 Andreas Öman
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
******************************************************************************/
#include <fcntl.h>
#include <sys/time.h>
#include <sys/param.h>
#include <netdb.h>
#include <assert.h>
#include <stdlib.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#ifdef __linux__
#include <sys/epoll.h>
#elif defined(__APPLE__)
#include <sys/event.h>
#else
#error Need poll mechanism
#endif
#if defined(WITH_OPENSSL)
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/x509v3.h>
#endif
#include "queue.h"
#include "asyncio.h"
#include "trace.h"
#include "talloc.h"
#include "sock.h"
#include "misc.h"
#include "libsvc.h"
#include "strvec.h"
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
LIST_HEAD(asyncio_timer_list, asyncio_timer);
LIST_HEAD(asyncio_worker_list, asyncio_worker);
static LIST_HEAD(, asyncio_fd) deferred_processings;
#if defined(WITH_OPENSSL)
struct asyncio_sslctx_host {
char *ash_hostname;
SSL_CTX *ash_ctx;
int ash_wildcard;
};
struct asyncio_sslctx {
atomic_t refcount;
unsigned int client;
size_t num_hosts;
struct asyncio_sslctx_host hosts[0];
};
static struct asyncio_sslctx *
sslctx_alloc(size_t num_hosts)
{
assert(num_hosts > 0);
asyncio_sslctx_t *as = calloc(1, sizeof(struct asyncio_sslctx) +
sizeof(struct asyncio_sslctx_host) * num_hosts);
as->num_hosts = num_hosts;
atomic_set(&as->refcount, 1);
return as;
}
static asyncio_sslctx_t *
sslctx_retain(asyncio_sslctx_t *ctx)
{
if(ctx)
atomic_inc(&ctx->refcount);
return ctx;
}
static void
sslctx_release(asyncio_sslctx_t *ctx)
{
if(!ctx || atomic_dec(&ctx->refcount))
return;
for(size_t i = 0; i < ctx->num_hosts; i++) {
SSL_CTX_free(ctx->hosts[i].ash_ctx);
free(ctx->hosts[i].ash_hostname);
}
free(ctx);
}
#endif
/**
*
*/
struct asyncio_fd {
asyncio_poll_cb_t *af_pollerr;
asyncio_error_cb_t *af_error;
asyncio_accept_cb_t *af_accept;
asyncio_poll_cb_t *af_pollin;
asyncio_poll_cb_t *af_pollout;
asyncio_read_cb_t *af_bytes_avail;
asyncio_socket_trace_cb_t *af_trace;
int (*af_locked_write)(struct asyncio_fd *af, int canwrite);
void *af_opaque;
mbuf_grp_t *af_sendq;
mbuf_t af_recvq;
char *af_hostname;
pthread_mutex_t af_sendq_mutex;
pthread_cond_t af_sendq_cond;
atomic_t af_refcount;
int af_fd;
int af_epoll_flags;
uint16_t af_port;
uint16_t af_flags;
uint8_t af_pending_shutdown;
uint8_t af_deferred_processing;
int af_pending_error;
char *af_title;
#if defined(WITH_OPENSSL)
int af_ssl_established;
int af_ssl_read_status;
int af_ssl_write_status;
SSL *af_ssl;
asyncio_sslctx_t *af_sslctx;
uint8_t af_handshake_inspect_buf[32];
size_t af_handshake_inspect_buf_used;
#endif
LIST_ENTRY(asyncio_fd) af_deferred_processing_link;
};
#define TW_TIME_SHIFT 18
#define TW_SLOTS 65536
#define TW_SLOT_MASK (TW_SLOTS - 1)
static struct asyncio_timer_list timerwheel[TW_SLOTS];
static int timerwheel_read_pos;
static int asyncio_pipe[2];
static asyncio_fd_t *pipe_af;
static int epfd = -1;
static int asyncio_task_worker;
static struct asyncio_worker_list asyncio_workers;
static pthread_t asyncio_tid;
/**
*
*/
typedef struct asyncio_worker {
LIST_ENTRY(asyncio_worker) link;
void (*fn)(void);
int id;
int pending;
} asyncio_worker_t;
static pthread_mutex_t asyncio_worker_mutex;
/**
*
*/
typedef struct asyncio_task {
TAILQ_ENTRY(asyncio_task) at_link;
void (*at_fn)(void *aux);
void *at_aux;
int at_block;
} asyncio_task_t;
static pthread_mutex_t asyncio_task_mutex;
static pthread_cond_t asyncio_task_cond;
static TAILQ_HEAD(, asyncio_task) asyncio_tasks;
static void
af_lock(asyncio_fd_t *af)
{
if(af->af_flags & ASYNCIO_FLAG_THREAD_SAFE)
pthread_mutex_lock(&af->af_sendq_mutex);
}
static void
af_unlock(asyncio_fd_t *af)
{
if(af->af_flags & ASYNCIO_FLAG_THREAD_SAFE)
pthread_mutex_unlock(&af->af_sendq_mutex);
}
/**
*
*/
static void
set_nonblocking(int fd, int on)
{
int flags = fcntl(fd, F_GETFL);
if(on) {
flags |= O_NONBLOCK;
} else {
flags &= ~O_NONBLOCK;
}
fcntl(fd, F_SETFL, flags);
}
/**
*
*/
static void
setup_tcp_socket(int fd, int no_delay)
{
int val;
val = 1;
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val));
#ifdef TCP_KEEPIDLE
val = 30;
setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof(val));
#endif
#ifdef TCP_KEEPINVL
val = 15;
setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof(val));
#endif
#ifdef TCP_KEEPCNT
val = 5;
setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof(val));
#endif
val = !!no_delay;
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
set_nonblocking(fd, 1);
}
/**
*
*/
void
asyncio_wakeup_worker(int id)
{
char x = id;
while(1) {
int r = write(asyncio_pipe[1], &x, 1);
if(r == 1)
return;
if(r == -1 && errno == EINTR)
continue;
fprintf(stderr, "Pipe problems\n");
break;
}
}
/**
*
*/
void
asyncio_timer_init(asyncio_timer_t *at, void (*fn)(void *opaque, int64_t now),
void *opaque)
{
at->at_fn = fn;
at->at_opaque = opaque;
at->at_expire = 0;
}
/**
*
*/
int64_t
asyncio_get_monotime(void)
{
#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
struct timespec tv;
clock_gettime(CLOCK_MONOTONIC, &tv);
return (int64_t)tv.tv_sec * 1000000LL + (tv.tv_nsec / 1000);
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return (int64_t)tv.tv_sec * 1000000LL + tv.tv_usec;
#endif
}
/**
*
*/
void
asyncio_timer_arm_delta(asyncio_timer_t *at, uint64_t delta)
{
assert(pthread_self() == asyncio_tid);
if(at->at_expire)
LIST_REMOVE(at, at_link);
const int64_t now = asyncio_get_monotime();
int64_t expire = now + delta;
if(expire < now)
expire = now;
const int slot = ((expire >> TW_TIME_SHIFT) + 1) & TW_SLOT_MASK;
at->at_expire = expire;
LIST_INSERT_HEAD(&timerwheel[slot], at, at_link);
}
/**
*
*/
void
asyncio_timer_disarm(asyncio_timer_t *at)
{
assert(pthread_self() == asyncio_tid);
if(at->at_expire) {
LIST_REMOVE(at, at_link);
at->at_expire = 0;
}
}
#ifdef __linux__
/**
*
*/
static void
mod_poll_flags(asyncio_fd_t *af, int set, int clr)
{
struct epoll_event e;
int f = (af->af_epoll_flags | set) & ~clr;
if(f == af->af_epoll_flags)
return;
assert(af->af_fd != -1);
e.data.ptr = af;
e.events = f;
int op;
if(!f) {
op = EPOLL_CTL_DEL;
} else if(!af->af_epoll_flags) {
op = EPOLL_CTL_ADD;
} else {
op = EPOLL_CTL_MOD;
}
assert(epfd != -1);
int r = epoll_ctl(epfd, op, af->af_fd, &e);
if(r) {
fprintf(stderr, "epoll_ctl(%d, %d, %x) for %s -- %s\n",
op, af->af_fd, e.events, af->af_title ?: "<noname>",
strerror(errno));
}
af->af_epoll_flags = f;
}
#endif
#ifdef __APPLE__
#define EPOLLIN 0x1
#define EPOLLOUT 0x2
#define MSG_MORE 0
/**
*
*/
static void
mod_poll_flags(asyncio_fd_t *af, int set, int clr)
{
set &= ~af->af_epoll_flags;
clr &= af->af_epoll_flags;
assert(af->af_fd != -1);
struct kevent changes[2];
int num_changes = 0;
if(set & EPOLLIN) {
EV_SET(&changes[0], af->af_fd, EVFILT_READ, EV_ADD, 0, 0, af);
num_changes++;
} else if(clr & EPOLLIN) {
EV_SET(&changes[0], af->af_fd, EVFILT_READ, EV_DELETE, 0, 0, af);
num_changes++;
}
if(set & EPOLLOUT) {
EV_SET(&changes[num_changes], af->af_fd, EVFILT_WRITE, EV_ADD, 0, 0, af);
num_changes++;
} else if(clr & EPOLLOUT) {
EV_SET(&changes[num_changes], af->af_fd, EVFILT_WRITE, EV_DELETE, 0, 0, af);
num_changes++;
}
struct timespec instant = {};
int r = kevent(epfd, changes, num_changes, NULL, 0, &instant);
if(r == -1)
perror("kevent() modify");
af->af_epoll_flags = (af->af_epoll_flags | set) & ~clr;
}
#endif
/**
*
*/
static asyncio_fd_t *
asyncio_fd_create(int fd, int initial_poll_flags)
{
asyncio_fd_t *af = calloc(1, sizeof(asyncio_fd_t));
af->af_fd = fd;
atomic_set(&af->af_refcount, 1);
af->af_sendq = mbuf_grp_create(MBUF_GRP_MODE_STRICT_PRIORITY);
mbuf_init(&af->af_recvq);
mod_poll_flags(af, initial_poll_flags, 0);
return af;
}
/**
*
*/
void
asyncio_fd_retain(asyncio_fd_t *af)
{
atomic_inc(&af->af_refcount);
}
/**
*
*/
void
asyncio_fd_release(asyncio_fd_t *af)
{
if(atomic_dec(&af->af_refcount))
return;
assert(af->af_fd == -1);
if(af->af_flags & ASYNCIO_FLAG_THREAD_SAFE) {
pthread_mutex_destroy(&af->af_sendq_mutex);
pthread_cond_destroy(&af->af_sendq_cond);
}
mbuf_grp_destroy(af->af_sendq);
mbuf_clear(&af->af_recvq);
free(af->af_hostname);
free(af->af_title);
#if defined(WITH_OPENSSL)
sslctx_release(af->af_sslctx);
#endif
free(af);
}
/**
*
*/
static int
do_write_locked(asyncio_fd_t *af, int can_write)
{
while(1) {
const void *buf;
size_t avail = mbuf_grp_peek_no_copy(af->af_sendq, &buf);
if(avail == 0) {
if(af->af_pending_shutdown) {
shutdown(af->af_fd, 2);
}
// Nothing more to send
mod_poll_flags(af, 0, EPOLLOUT);
return 0;
}
int r = send(af->af_fd, buf, avail, MSG_NOSIGNAL);
if(r == 0)
break;
if(r == -1 && (errno == EAGAIN || errno == EINTR))
break;
if(r == -1) {
mod_poll_flags(af, 0, EPOLLOUT);
return errno;
}
assert(r <= avail);
mbuf_grp_drop(af->af_sendq, r);
if(af->af_flags & ASYNCIO_FLAG_THREAD_SAFE)
pthread_cond_signal(&af->af_sendq_cond);
if(r != avail)
break;
}
mod_poll_flags(af, EPOLLOUT, 0);
return 0;
}
/**
*
*/
int
asyncio_wait_send_buffer(asyncio_fd_t *af, int size)
{
int r = 0;
pthread_mutex_lock(&af->af_sendq_mutex);
while(1) {
if(af->af_pending_error) {
r = af->af_pending_error;
break;
}
if(size > mbuf_grp_size(af->af_sendq))
break;
pthread_cond_wait(&af->af_sendq_cond, &af->af_sendq_mutex);
}
pthread_mutex_unlock(&af->af_sendq_mutex);
return r;
}
/**
*
*/
size_t
asyncio_fd_get_queue_length(asyncio_fd_t *af, int queue_index)
{
af_lock(af);
size_t r = mbuf_grp_size_for_queue(af->af_sendq, queue_index);
af_unlock(af);
return r;
}
int
asyncio_get_fd(asyncio_fd_t *af)
{
return af->af_fd;
}
/**
*
*/
static void
do_error(asyncio_fd_t *af, int error)
{
if(af->af_flags & ASYNCIO_FLAG_THREAD_SAFE) {
pthread_mutex_lock(&af->af_sendq_mutex);
af->af_pending_error = error ?: -1;
pthread_cond_signal(&af->af_sendq_cond);
pthread_mutex_unlock(&af->af_sendq_mutex);
}
if(af->af_error != NULL)
af->af_error(af->af_opaque, error);
af->af_error = NULL;
}
/**
*
*/
static void
do_write_pollout(asyncio_fd_t *af, void *opaque)
{
af_lock(af);
int err = af->af_fd == -1 ? 0 : af->af_locked_write(af, 1);
af_unlock(af);
if(err)
do_error(af, err);
}
/**
*
*/
static void
do_read(asyncio_fd_t *af, void *opaque)
{
char tmp[1024];
while(1) {
int r = read(af->af_fd, tmp, sizeof(tmp));
if(r == 0) {
if(af->af_recvq.mq_size)
af->af_bytes_avail(af->af_opaque, &af->af_recvq);
do_error(af, 0);
return;
}
if(r == -1 && (errno == EAGAIN || errno == EINTR))
break;
if(r == -1) {
do_error(af, errno);
return;
}
mbuf_append(&af->af_recvq, tmp, r);
}
af->af_bytes_avail(af->af_opaque, &af->af_recvq);
}
#if defined(WITH_OPENSSL)
static void __attribute__((unused))
ssldump(asyncio_fd_t *af)
{
unsigned long e;
char errbuf[512];
while((e = ERR_get_error()) != 0) {
ERR_error_string_n(e, errbuf, sizeof(errbuf));
trace(LOG_INFO, "SSL: %s: %s", af->af_title, errbuf);
}
}
/**
*
*/
static int
verify_hostname(const char *hostname, X509 *cert, char *errbuf, size_t errlen)
{
int i;
/* domainname is the "domain" we wan't to access (actually hostname
* with first part of the DNS name removed) */
const char *domainname = strchr(hostname, '.');
if(domainname != NULL) {
domainname++;
if(strlen(domainname) == 0)
domainname = NULL;
}
// First check commonName
X509_NAME *subjectName;
char commonName[256];
subjectName = X509_get_subject_name(cert);
if(X509_NAME_get_text_by_NID(subjectName, NID_commonName,
commonName, sizeof(commonName)) != -1) {
if(!strcmp(commonName, hostname))
return 0;
}
// Then check altNames
GENERAL_NAMES *names = X509_get_ext_d2i( cert, NID_subject_alt_name, 0, 0);
if(names == NULL) {
snprintf(errbuf, errlen, "SSL: No subjectAltName extension");
return -1;
}
const int num_names = sk_GENERAL_NAME_num(names);
for(i = 0; i < num_names; ++i ) {
GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
unsigned char *dns;
int match;
if(name->type != GEN_DNS)
continue;
ASN1_STRING_to_UTF8(&dns, name->d.dNSName);
if(dns[0] == '*' && dns[1] == '.') {
match = domainname != NULL && !strcasecmp((char *)dns+2, domainname);
} else {
match = !strcasecmp((char *)dns, hostname);
}
OPENSSL_free(dns);
if(match) {
GENERAL_NAMES_free(names);
return 0;
}
}
GENERAL_NAMES_free(names);
snprintf(errbuf, errlen, "SSL: Hostname mismatch");
return -1;
}
static int
asyncio_ssl_verify(asyncio_fd_t *af)
{
X509 *peer = SSL_get_peer_certificate(af->af_ssl);
if(peer == NULL) {
if(af->af_trace)
af->af_trace(af->af_opaque, "No peer certificate");
return EDOM;
}
const int err = SSL_get_verify_result(af->af_ssl);
if(err != X509_V_OK) {
if(af->af_trace)
af->af_trace(af->af_opaque, "Certificate does not verify");
X509_free(peer);
return EDOM;
}
char errbuf[512];
if(verify_hostname(af->af_hostname, peer, errbuf, sizeof(errbuf))) {
X509_free(peer);
if(af->af_trace) {
scoped_char *err = fmt("Mismatching hostname: %s", errbuf);
af->af_trace(af->af_opaque, err);
}
return EDOM;
}
X509_free(peer);
return 0;
}
/**
*
*/
static char *
ssl_poll_errstack()
{
scoped_strvec(errors);
unsigned long e;
char errbuf[512];
while((e = ERR_get_error()) != 0) {
ERR_error_string_n(e, errbuf, sizeof(errbuf));
strvec_push(&errors, errbuf);
}
return strvec_join(&errors, ", ");
}
/**
*
*/
static int
asyncio_ssl_handshake(asyncio_fd_t *af)
{
if(af->af_trace && af->af_handshake_inspect_buf_used == 0) {
int x = recv(af->af_fd, af->af_handshake_inspect_buf,
sizeof(af->af_handshake_inspect_buf), MSG_PEEK);
if(x > 0) {
af->af_handshake_inspect_buf_used = x;
}
}
int r = SSL_do_handshake(af->af_ssl);
int err = SSL_get_error(af->af_ssl, r);
switch(err) {
case SSL_ERROR_WANT_READ:
mod_poll_flags(af, EPOLLIN, EPOLLOUT);
return 0;
case SSL_ERROR_WANT_WRITE:
mod_poll_flags(af, EPOLLOUT, EPOLLIN);
return 0;
case SSL_ERROR_NONE:
mod_poll_flags(af, EPOLLIN, EPOLLOUT);
if(mbuf_grp_size(af->af_sendq))
mod_poll_flags(af, EPOLLOUT, 0);
af->af_ssl_established = 1;
if(af->af_trace)
af->af_trace(af->af_opaque, "TLS established");
if(af->af_hostname != NULL &&
af->af_flags & ASYNCIO_FLAG_SSL_VERIFY_CERT)
return asyncio_ssl_verify(af);
return 0;
}
scoped_char *sslerr = ssl_poll_errstack();
if(af->af_trace) {
char hex[sizeof(af->af_handshake_inspect_buf) * 3 + 1];
char *dst = hex;
size_t i;
for(i = 0; i < af->af_handshake_inspect_buf_used; i++) {
if(i)
*dst++ = ' ';
uint8_t v = af->af_handshake_inspect_buf[i];
*dst++ = "0123456789abcdef"[v >> 4];
*dst++ = "0123456789abcdef"[v & 15];
}
*dst = 0;
scoped_char *msg = fmt("SSL Handshake failed err:%d r:%d sslerr:%s recv:[%s]",
err, r, sslerr, hex);
af->af_trace(af->af_opaque, msg);
}
return ENOLINK;
}
static void
do_ssl_update_poll_flags_ex(asyncio_fd_t *af, int line)
{
#if 0
printf("Update poll flags line %d\n", line);
printf(" READ: %s\n",
af->af_ssl_read_status == SSL_ERROR_WANT_READ ? "READ" :
af->af_ssl_read_status == SSL_ERROR_WANT_WRITE ? "WRITE" : "-");
printf(" WRITE: %s\n",
af->af_ssl_write_status == SSL_ERROR_WANT_READ ? "READ" :
af->af_ssl_write_status == SSL_ERROR_WANT_WRITE ? "WRITE" : "-");
#endif
int events = 0;
if(af->af_ssl_read_status == SSL_ERROR_WANT_WRITE) {
events |= EPOLLOUT;
} else {
events |= EPOLLIN;
}
if(af->af_ssl_write_status == SSL_ERROR_WANT_WRITE) {
events |= EPOLLOUT;
} else if(af->af_ssl_write_status == SSL_ERROR_WANT_READ) {
events |= EPOLLIN;
}
// printf("mod poll flags: %x\n", events);
mod_poll_flags(af, events, ~events & (EPOLLIN | EPOLLOUT));
}
#define do_ssl_update_poll_flags(af) \
do_ssl_update_poll_flags_ex(af, __LINE__)
static int do_ssl_write_locked(asyncio_fd_t *af, int canwrite);
/**
*
*/
static int
do_ssl_read_locked(asyncio_fd_t *af, void *opaque)
{
char buf[4096];
af->af_ssl_read_status = 0;
for(int i = 0; i < 10 && af->af_ssl != NULL; i++) {
if(af->af_ssl_write_status == SSL_ERROR_WANT_READ) {
return 0;
}
af->af_ssl_read_status = 0;
int r = SSL_read(af->af_ssl, buf, sizeof(buf));
int err = SSL_get_error(af->af_ssl, r);
switch(err) {
case SSL_ERROR_NONE:
mbuf_append(&af->af_recvq, buf, r);
break;
case SSL_ERROR_ZERO_RETURN:
// Conection closed
do_ssl_update_poll_flags(af);
return ECONNRESET;
case SSL_ERROR_SYSCALL:
return errno ?: ECONNRESET;
default:
do_ssl_update_poll_flags(af);
{
scoped_char *sslerr = ssl_poll_errstack();
if(af->af_trace) {
scoped_char *msg = fmt("SSL Error err:%d r:%d sslerr:%s", err, r, sslerr);
af->af_trace(af->af_opaque, msg);
}
}
return ENOLINK;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
af->af_ssl_read_status = err;
do_ssl_update_poll_flags(af);
return 0;
}
af_unlock(af);
af->af_bytes_avail(af->af_opaque, &af->af_recvq);
af_lock(af);
}
return 0;
}
/**
*
*/
static void
do_ssl_read(asyncio_fd_t *af, void *opaque)
{
af_lock(af);
if(!af->af_ssl_established) {
int err = asyncio_ssl_handshake(af);
af_unlock(af);
if(err)
do_error(af, err);
return;
}
if(af->af_ssl_write_status == SSL_ERROR_WANT_READ) {
do_ssl_write_locked(af, 1);
af_unlock(af);
return;
}
af->af_ssl_read_status = 0;
int err = do_ssl_read_locked(af, opaque);
af_unlock(af);
if(err)
do_error(af, err);
}
static int
do_ssl_write_locked(asyncio_fd_t *af, int canwrite)
{
if(!af->af_ssl_established) {
return asyncio_ssl_handshake(af);
}