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monero/external/unbound/util/ub_event_pluggable.c

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/*
* util/ub_event_pluggable.c - call registered pluggable event functions
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* HOLDER OR CONTRIBUTORS 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.
*/
/**
* \file
*
* This file contains an implementation for the indirection layer for pluggable
* events that calls the registered pluggable event loop. It also defines a
* default pluggable event loop based on the default libevent (compatibility)
* functions.
*/
#include "config.h"
#include <sys/time.h>
#include "util/ub_event.h"
#include "libunbound/unbound-event.h"
#include "util/netevent.h"
#include "util/log.h"
#include "util/fptr_wlist.h"
/* We define libevent structures here to hide the libevent stuff. */
#ifdef USE_MINI_EVENT
# ifdef USE_WINSOCK
# include "util/winsock_event.h"
# else
# include "util/mini_event.h"
# endif /* USE_WINSOCK */
#else /* USE_MINI_EVENT */
/* we use libevent */
# ifdef HAVE_EVENT_H
# include <event.h>
# else
# include "event2/event.h"
# include "event2/event_struct.h"
# include "event2/event_compat.h"
# endif
#endif /* USE_MINI_EVENT */
#if UB_EV_TIMEOUT != EV_TIMEOUT || UB_EV_READ != EV_READ || \
UB_EV_WRITE != EV_WRITE || UB_EV_SIGNAL != EV_SIGNAL || \
UB_EV_PERSIST != EV_PERSIST
/* Only necessary for libev */
# define NATIVE_BITS(b) ( \
(((b) & UB_EV_TIMEOUT) ? EV_TIMEOUT : 0) \
| (((b) & UB_EV_READ ) ? EV_READ : 0) \
| (((b) & UB_EV_WRITE ) ? EV_WRITE : 0) \
| (((b) & UB_EV_SIGNAL ) ? EV_SIGNAL : 0) \
| (((b) & UB_EV_PERSIST) ? EV_PERSIST : 0))
# define UB_EV_BITS(b) ( \
(((b) & EV_TIMEOUT) ? UB_EV_TIMEOUT : 0) \
| (((b) & EV_READ ) ? UB_EV_READ : 0) \
| (((b) & EV_WRITE ) ? UB_EV_WRITE : 0) \
| (((b) & EV_SIGNAL ) ? UB_EV_SIGNAL : 0) \
| (((b) & EV_PERSIST) ? UB_EV_PERSIST : 0))
# define UB_EV_BITS_CB(C) void my_ ## C (int fd, short bits, void *arg) \
{ (C)(fd, UB_EV_BITS(bits), arg); }
UB_EV_BITS_CB(comm_point_udp_callback);
UB_EV_BITS_CB(comm_point_udp_ancil_callback)
UB_EV_BITS_CB(comm_point_tcp_accept_callback)
UB_EV_BITS_CB(comm_point_tcp_handle_callback)
UB_EV_BITS_CB(comm_timer_callback)
UB_EV_BITS_CB(comm_signal_callback)
UB_EV_BITS_CB(comm_point_local_handle_callback)
UB_EV_BITS_CB(comm_point_raw_handle_callback)
UB_EV_BITS_CB(tube_handle_signal)
UB_EV_BITS_CB(comm_base_handle_slow_accept)
static void (*NATIVE_BITS_CB(void (*cb)(int, short, void*)))(int, short, void*)
{
if(cb == comm_point_udp_callback)
return my_comm_point_udp_callback;
else if(cb == comm_point_udp_ancil_callback)
return my_comm_point_udp_ancil_callback;
else if(cb == comm_point_tcp_accept_callback)
return my_comm_point_tcp_accept_callback;
else if(cb == comm_point_tcp_handle_callback)
return my_comm_point_tcp_handle_callback;
else if(cb == comm_timer_callback)
return my_comm_timer_callback;
else if(cb == comm_signal_callback)
return my_comm_signal_callback;
else if(cb == comm_point_local_handle_callback)
return my_comm_point_local_handle_callback;
else if(cb == comm_point_raw_handle_callback)
return my_comm_point_raw_handle_callback;
else if(cb == tube_handle_signal)
return my_tube_handle_signal;
else if(cb == comm_base_handle_slow_accept)
return my_comm_base_handle_slow_accept;
else
return NULL;
}
#else
# define NATIVE_BITS(b) (b)
# define NATIVE_BITS_CB(c) (c)
#endif
#ifndef EVFLAG_AUTO
#define EVFLAG_AUTO 0
#endif
struct my_event_base {
struct ub_event_base super;
struct event_base* base;
};
struct my_event {
struct ub_event super;
struct event ev;
};
#define AS_MY_EVENT_BASE(x) ((struct my_event_base*)x)
#define AS_MY_EVENT(x) ((struct my_event*)x)
const char* ub_event_get_version(void)
{
return "pluggable-event"PACKAGE_VERSION;
}
static void
my_event_add_bits(struct ub_event* ev, short bits)
{
AS_MY_EVENT(ev)->ev.ev_events |= NATIVE_BITS(bits);
}
static void
my_event_del_bits(struct ub_event* ev, short bits)
{
AS_MY_EVENT(ev)->ev.ev_events &= ~NATIVE_BITS(bits);
}
static void
my_event_set_fd(struct ub_event* ev, int fd)
{
AS_MY_EVENT(ev)->ev.ev_fd = fd;
}
static void
my_event_free(struct ub_event* ev)
{
free(AS_MY_EVENT(ev));
}
static int
my_event_add(struct ub_event* ev, struct timeval* tv)
{
return event_add(&AS_MY_EVENT(ev)->ev, tv);
}
static int
my_event_del(struct ub_event* ev)
{
return event_del(&AS_MY_EVENT(ev)->ev);
}
static int
my_timer_add(struct ub_event* ev, struct ub_event_base* base,
void (*cb)(int, short, void*), void* arg, struct timeval* tv)
{
event_set(&AS_MY_EVENT(ev)->ev, -1, EV_TIMEOUT,NATIVE_BITS_CB(cb),arg);
if (event_base_set(AS_MY_EVENT_BASE(base)->base, &AS_MY_EVENT(ev)->ev)
!= 0)
return -1;
return evtimer_add(&AS_MY_EVENT(ev)->ev, tv);
}
static int
my_timer_del(struct ub_event* ev)
{
return evtimer_del(&AS_MY_EVENT(ev)->ev);
}
static int
my_signal_add(struct ub_event* ev, struct timeval* tv)
{
return signal_add(&AS_MY_EVENT(ev)->ev, tv);
}
static int
my_signal_del(struct ub_event* ev)
{
return signal_del(&AS_MY_EVENT(ev)->ev);
}
static void
my_winsock_unregister_wsaevent(struct ub_event* ev)
{
#if defined(USE_MINI_EVENT) && defined(USE_WINSOCK)
winsock_unregister_wsaevent(&AS_MY_EVENT(ev)->ev);
free(AS_MY_EVENT(ev));
#else
(void)ev;
#endif
}
static void
my_winsock_tcp_wouldblock(struct ub_event* ev, int eventbits)
{
#if defined(USE_MINI_EVENT) && defined(USE_WINSOCK)
winsock_tcp_wouldblock(&AS_MY_EVENT(ev)->ev, NATIVE_BITS(eventbits));
#else
(void)ev;
(void)eventbits;
#endif
}
static struct ub_event_vmt default_event_vmt = {
my_event_add_bits, my_event_del_bits, my_event_set_fd,
my_event_free, my_event_add, my_event_del,
my_timer_add, my_timer_del, my_signal_add, my_signal_del,
my_winsock_unregister_wsaevent, my_winsock_tcp_wouldblock
};
static void
my_event_base_free(struct ub_event_base* base)
{
#ifdef USE_MINI_EVENT
event_base_free(AS_MY_EVENT_BASE(base)->base);
#elif defined(HAVE_EVENT_BASE_FREE) && defined(HAVE_EVENT_BASE_ONCE)
/* only libevent 1.2+ has it, but in 1.2 it is broken -
assertion fails on signal handling ev that is not deleted
in libevent 1.3c (event_base_once appears) this is fixed. */
event_base_free(AS_MY_EVENT_BASE(base)->base);
#endif /* HAVE_EVENT_BASE_FREE and HAVE_EVENT_BASE_ONCE */
free(AS_MY_EVENT_BASE(base));
}
static int
my_event_base_dispatch(struct ub_event_base* base)
{
return event_base_dispatch(AS_MY_EVENT_BASE(base)->base);
}
static int
my_event_base_loopexit(struct ub_event_base* base, struct timeval* tv)
{
return event_base_loopexit(AS_MY_EVENT_BASE(base)->base, tv);
}
static struct ub_event*
my_event_new(struct ub_event_base* base, int fd, short bits,
void (*cb)(int, short, void*), void* arg)
{
struct my_event *my_ev = (struct my_event*)calloc(1,
sizeof(struct my_event));
if (!my_ev)
return NULL;
event_set(&my_ev->ev, fd, NATIVE_BITS(bits), NATIVE_BITS_CB(cb), arg);
if (event_base_set(AS_MY_EVENT_BASE(base)->base, &my_ev->ev) != 0) {
free(my_ev);
return NULL;
}
my_ev->super.magic = UB_EVENT_MAGIC;
my_ev->super.vmt = &default_event_vmt;
return &my_ev->super;
}
static struct ub_event*
my_signal_new(struct ub_event_base* base, int fd,
void (*cb)(int, short, void*), void* arg)
{
struct my_event *my_ev = (struct my_event*)calloc(1,
sizeof(struct my_event));
if (!my_ev)
return NULL;
signal_set(&my_ev->ev, fd, NATIVE_BITS_CB(cb), arg);
if (event_base_set(AS_MY_EVENT_BASE(base)->base, &my_ev->ev) != 0) {
free(my_ev);
return NULL;
}
my_ev->super.magic = UB_EVENT_MAGIC;
my_ev->super.vmt = &default_event_vmt;
return &my_ev->super;
}
static struct ub_event*
my_winsock_register_wsaevent(struct ub_event_base* base, void* wsaevent,
void (*cb)(int, short, void*), void* arg)
{
#if defined(USE_MINI_EVENT) && defined(USE_WINSOCK)
struct my_event *my_ev = (struct my_event*)calloc(1,
sizeof(struct my_event));
if (!my_ev)
return NULL;
if (!winsock_register_wsaevent(AS_MY_EVENT_BASE(base)->base,
&my_ev->ev, wsaevent, cb, arg)) {
free(my_ev);
return NULL;
}
my_ev->super.magic = UB_EVENT_MAGIC;
my_ev->super.vmt = &default_event_vmt;
return &my_ev->super;
#else
(void)base;
(void)wsaevent;
(void)cb;
(void)arg;
return NULL;
#endif
}
static struct ub_event_base_vmt default_event_base_vmt = {
my_event_base_free, my_event_base_dispatch,
my_event_base_loopexit, my_event_new, my_signal_new,
my_winsock_register_wsaevent
};
struct ub_event_base*
ub_default_event_base(int sigs, time_t* time_secs, struct timeval* time_tv)
{
struct my_event_base* my_base = (struct my_event_base*)calloc(1,
sizeof(struct my_event_base));
if (!my_base)
return NULL;
#ifdef USE_MINI_EVENT
(void)sigs;
/* use mini event time-sharing feature */
my_base->base = event_init(time_secs, time_tv);
#else
(void)time_secs;
(void)time_tv;
# if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
/* libev */
if(sigs)
my_base->base = (struct event_base*)ev_default_loop(EVFLAG_AUTO);
else
my_base->base = (struct event_base*)ev_loop_new(EVFLAG_AUTO);
# else
(void)sigs;
# ifdef HAVE_EVENT_BASE_NEW
my_base->base = event_base_new();
# else
my_base->base = event_init();
# endif
# endif
#endif
if (!my_base->base) {
free(my_base);
return NULL;
}
my_base->super.magic = UB_EVENT_MAGIC;
my_base->super.vmt = &default_event_base_vmt;
return &my_base->super;
}
struct ub_event_base*
ub_libevent_event_base(struct event_base* base)
{
#ifdef USE_MINI_EVENT
(void)base;
return NULL;
#else
struct my_event_base* my_base = (struct my_event_base*)calloc(1,
sizeof(struct my_event_base));
if (!my_base)
return NULL;
my_base->super.magic = UB_EVENT_MAGIC;
my_base->super.vmt = &default_event_base_vmt;
my_base->base = base;
return &my_base->super;
#endif
}
struct event_base*
ub_libevent_get_event_base(struct ub_event_base* base)
{
#ifndef USE_MINI_EVENT
if (base->vmt == &default_event_base_vmt)
return AS_MY_EVENT_BASE(base)->base;
#else
(void)base;
#endif
return NULL;
}
#if (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) && defined(EVBACKEND_SELECT)
static const char* ub_ev_backend2str_pluggable(int b)
{
switch(b) {
case EVBACKEND_SELECT: return "select";
case EVBACKEND_POLL: return "poll";
case EVBACKEND_EPOLL: return "epoll";
case EVBACKEND_KQUEUE: return "kqueue";
case EVBACKEND_DEVPOLL: return "devpoll";
case EVBACKEND_PORT: return "evport";
}
return "unknown";
}
#endif
void
ub_get_event_sys(struct ub_event_base* ub_base, const char** n, const char** s,
const char** m)
{
#ifdef USE_WINSOCK
(void)ub_base;
*n = "pluggable-event";
*s = "winsock";
*m = "WSAWaitForMultipleEvents";
#elif defined(USE_MINI_EVENT)
(void)ub_base;
*n = "pluggable-event";
*s = "internal";
*m = "select";
#else
struct event_base* b = ub_libevent_get_event_base(ub_base);
/* This function is only called from comm_base_create, so
* ub_base is guaranteed to exist and to be the default
* event base.
*/
assert(b);
*n = "pluggable-event";
*s = event_get_version();
# if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
*n = "pluggable-libev";
# ifdef EVBACKEND_SELECT
*m = ub_ev_backend2str_pluggable(ev_backend((struct ev_loop*)b));
# else
*m = "not obtainable";
# endif
# elif defined(HAVE_EVENT_BASE_GET_METHOD)
*n = "pluggable-libevent";
*m = event_base_get_method(b);
# else
*m = "not obtainable";
# endif
#endif
}
void
ub_event_base_free(struct ub_event_base* base)
{
if (base && base->magic == UB_EVENT_MAGIC) {
fptr_ok(base->vmt != &default_event_base_vmt ||
base->vmt->free == my_event_base_free);
(*base->vmt->free)(base);
}
}
int
ub_event_base_dispatch(struct ub_event_base* base)
{
if (base->magic == UB_EVENT_MAGIC) {
fptr_ok(base->vmt != &default_event_base_vmt ||
base->vmt->dispatch == my_event_base_dispatch);
return (*base->vmt->dispatch)(base);
}
return -1;
}
int
ub_event_base_loopexit(struct ub_event_base* base)
{
if (base->magic == UB_EVENT_MAGIC) {
fptr_ok(base->vmt != &default_event_base_vmt ||
base->vmt->loopexit == my_event_base_loopexit);
return (*base->vmt->loopexit)(base, NULL);
}
return -1;
}
struct ub_event*
ub_event_new(struct ub_event_base* base, int fd, short bits,
void (*cb)(int, short, void*), void* arg)
{
if (base->magic == UB_EVENT_MAGIC) {
fptr_ok(base->vmt != &default_event_base_vmt ||
base->vmt->new_event == my_event_new);
return (*base->vmt->new_event)(base, fd, bits, cb, arg);
}
return NULL;
}
struct ub_event*
ub_signal_new(struct ub_event_base* base, int fd,
void (*cb)(int, short, void*), void* arg)
{
if (base->magic == UB_EVENT_MAGIC) {
fptr_ok(base->vmt != &default_event_base_vmt ||
base->vmt->new_signal == my_signal_new);
return (*base->vmt->new_signal)(base, fd, cb, arg);
}
return NULL;
}
struct ub_event*
ub_winsock_register_wsaevent(struct ub_event_base* base, void* wsaevent,
void (*cb)(int, short, void*), void* arg)
{
if (base->magic == UB_EVENT_MAGIC) {
fptr_ok(base->vmt != &default_event_base_vmt ||
base->vmt->winsock_register_wsaevent ==
my_winsock_register_wsaevent);
return (*base->vmt->winsock_register_wsaevent)(base, wsaevent, cb, arg);
}
return NULL;
}
void
ub_event_add_bits(struct ub_event* ev, short bits)
{
if (ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->add_bits == my_event_add_bits);
(*ev->vmt->add_bits)(ev, bits);
}
}
void
ub_event_del_bits(struct ub_event* ev, short bits)
{
if (ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->del_bits == my_event_del_bits);
(*ev->vmt->del_bits)(ev, bits);
}
}
void
ub_event_set_fd(struct ub_event* ev, int fd)
{
if (ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->set_fd == my_event_set_fd);
(*ev->vmt->set_fd)(ev, fd);
}
}
void
ub_event_free(struct ub_event* ev)
{
if (ev && ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->free == my_event_free);
(*ev->vmt->free)(ev);
}
}
int
ub_event_add(struct ub_event* ev, struct timeval* tv)
{
if (ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->add == my_event_add);
return (*ev->vmt->add)(ev, tv);
}
return -1;
}
int
ub_event_del(struct ub_event* ev)
{
if (ev && ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->del == my_event_del);
return (*ev->vmt->del)(ev);
}
return -1;
}
int
ub_timer_add(struct ub_event* ev, struct ub_event_base* base,
void (*cb)(int, short, void*), void* arg, struct timeval* tv)
{
if (ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->add_timer == my_timer_add);
return (*ev->vmt->add_timer)(ev, base, cb, arg, tv);
}
return -1;
}
int
ub_timer_del(struct ub_event* ev)
{
if (ev && ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->del_timer == my_timer_del);
return (*ev->vmt->del_timer)(ev);
}
return -1;
}
int
ub_signal_add(struct ub_event* ev, struct timeval* tv)
{
if (ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->add_signal == my_signal_add);
return (*ev->vmt->add_signal)(ev, tv);
}
return -1;
}
int
ub_signal_del(struct ub_event* ev)
{
if (ev && ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->del_signal == my_signal_del);
return (*ev->vmt->del_signal)(ev);
}
return -1;
}
void
ub_winsock_unregister_wsaevent(struct ub_event* ev)
{
if (ev && ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->winsock_unregister_wsaevent ==
my_winsock_unregister_wsaevent);
(*ev->vmt->winsock_unregister_wsaevent)(ev);
}
}
void
ub_winsock_tcp_wouldblock(struct ub_event* ev, int eventbits)
{
if (ev->magic == UB_EVENT_MAGIC) {
fptr_ok(ev->vmt != &default_event_vmt ||
ev->vmt->winsock_tcp_wouldblock ==
my_winsock_tcp_wouldblock);
(*ev->vmt->winsock_tcp_wouldblock)(ev, eventbits);
}
}
void ub_comm_base_now(struct comm_base* cb)
{
time_t *tt;
struct timeval *tv;
#ifdef USE_MINI_EVENT
/** minievent updates the time when it blocks. */
if (comm_base_internal(cb)->magic == UB_EVENT_MAGIC &&
comm_base_internal(cb)->vmt == &default_event_base_vmt)
return; /* Actually using mini event, so do not set time */
#endif /* USE_MINI_EVENT */
/** fillup the time values in the event base */
comm_base_timept(cb, &tt, &tv);
if(gettimeofday(tv, NULL) < 0) {
log_err("gettimeofday: %s", strerror(errno));
}
*tt = tv->tv_sec;
}
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