a85b5759f3
These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
445 lines
11 KiB
C
445 lines
11 KiB
C
/*
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* util/ub_event.c - directly call libevent (compatability) functions
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains and implementation for the indirection layer for pluggable
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* events that transparently passes it either directly to libevent, or calls
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* the libevent compatibility layer functions.
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*/
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#include "config.h"
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#include <sys/time.h>
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#include "util/ub_event.h"
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#include "util/log.h"
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#include "util/netevent.h"
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#include "util/tube.h"
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/* We define libevent structures here to hide the libevent stuff. */
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#ifdef USE_MINI_EVENT
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# ifdef USE_WINSOCK
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# include "util/winsock_event.h"
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# else
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# include "util/mini_event.h"
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# endif /* USE_WINSOCK */
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#else /* USE_MINI_EVENT */
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/* we use libevent */
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# ifdef HAVE_EVENT_H
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# include <event.h>
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# else
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# include "event2/event.h"
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# include "event2/event_struct.h"
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# include "event2/event_compat.h"
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# endif
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#endif /* USE_MINI_EVENT */
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#if UB_EV_TIMEOUT != EV_TIMEOUT || UB_EV_READ != EV_READ || \
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UB_EV_WRITE != EV_WRITE || UB_EV_SIGNAL != EV_SIGNAL || \
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UB_EV_PERSIST != EV_PERSIST
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/* Only necessary for libev */
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# define NATIVE_BITS(b) ( \
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(((b) & UB_EV_TIMEOUT) ? EV_TIMEOUT : 0) \
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| (((b) & UB_EV_READ ) ? EV_READ : 0) \
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| (((b) & UB_EV_WRITE ) ? EV_WRITE : 0) \
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| (((b) & UB_EV_SIGNAL ) ? EV_SIGNAL : 0) \
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| (((b) & UB_EV_PERSIST) ? EV_PERSIST : 0))
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# define UB_EV_BITS(b) ( \
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(((b) & EV_TIMEOUT) ? UB_EV_TIMEOUT : 0) \
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| (((b) & EV_READ ) ? UB_EV_READ : 0) \
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| (((b) & EV_WRITE ) ? UB_EV_WRITE : 0) \
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| (((b) & EV_SIGNAL ) ? UB_EV_SIGNAL : 0) \
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| (((b) & EV_PERSIST) ? UB_EV_PERSIST : 0))
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# define UB_EV_BITS_CB(C) void my_ ## C (int fd, short bits, void *arg) \
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{ (C)(fd, UB_EV_BITS(bits), arg); }
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UB_EV_BITS_CB(comm_point_udp_callback);
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UB_EV_BITS_CB(comm_point_udp_ancil_callback)
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UB_EV_BITS_CB(comm_point_tcp_accept_callback)
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UB_EV_BITS_CB(comm_point_tcp_handle_callback)
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UB_EV_BITS_CB(comm_timer_callback)
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UB_EV_BITS_CB(comm_signal_callback)
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UB_EV_BITS_CB(comm_point_local_handle_callback)
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UB_EV_BITS_CB(comm_point_raw_handle_callback)
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UB_EV_BITS_CB(tube_handle_signal)
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UB_EV_BITS_CB(comm_base_handle_slow_accept)
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static void (*NATIVE_BITS_CB(void (*cb)(int, short, void*)))(int, short, void*)
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{
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if(cb == comm_point_udp_callback)
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return my_comm_point_udp_callback;
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else if(cb == comm_point_udp_ancil_callback)
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return my_comm_point_udp_ancil_callback;
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else if(cb == comm_point_tcp_accept_callback)
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return my_comm_point_tcp_accept_callback;
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else if(cb == comm_point_tcp_handle_callback)
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return my_comm_point_tcp_handle_callback;
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else if(cb == comm_timer_callback)
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return my_comm_timer_callback;
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else if(cb == comm_signal_callback)
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return my_comm_signal_callback;
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else if(cb == comm_point_local_handle_callback)
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return my_comm_point_local_handle_callback;
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else if(cb == comm_point_raw_handle_callback)
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return my_comm_point_raw_handle_callback;
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else if(cb == tube_handle_signal)
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return my_tube_handle_signal;
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else if(cb == comm_base_handle_slow_accept)
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return my_comm_base_handle_slow_accept;
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else
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return NULL;
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}
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#else
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# define NATIVE_BITS(b) (b)
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# define NATIVE_BITS_CB(c) (c)
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#endif
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#ifndef EVFLAG_AUTO
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#define EVFLAG_AUTO 0
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#endif
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#define AS_EVENT_BASE(x) ((struct event_base*)x)
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#define AS_UB_EVENT_BASE(x) ((struct ub_event_base*)x)
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#define AS_EVENT(x) ((struct event*)x)
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#define AS_UB_EVENT(x) ((struct ub_event*)x)
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const char* ub_event_get_version(void)
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{
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return event_get_version();
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}
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#if (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) && defined(EVBACKEND_SELECT)
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static const char* ub_ev_backend2str(int b)
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{
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switch(b) {
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case EVBACKEND_SELECT: return "select";
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case EVBACKEND_POLL: return "poll";
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case EVBACKEND_EPOLL: return "epoll";
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case EVBACKEND_KQUEUE: return "kqueue";
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case EVBACKEND_DEVPOLL: return "devpoll";
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case EVBACKEND_PORT: return "evport";
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}
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return "unknown";
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}
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#endif
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void
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ub_get_event_sys(struct ub_event_base* base, const char** n, const char** s,
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const char** m)
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{
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#ifdef USE_WINSOCK
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(void)base;
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*n = "event";
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*s = "winsock";
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*m = "WSAWaitForMultipleEvents";
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#elif defined(USE_MINI_EVENT)
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(void)base;
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*n = "mini-event";
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*s = "internal";
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*m = "select";
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#else
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struct event_base* b = AS_EVENT_BASE(base);
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*s = event_get_version();
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# if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
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*n = "libev";
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if (!b)
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b = (struct event_base*)ev_default_loop(EVFLAG_AUTO);
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# ifdef EVBACKEND_SELECT
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*m = ub_ev_backend2str(ev_backend((struct ev_loop*)b));
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# else
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*m = "not obtainable";
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# endif
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# elif defined(HAVE_EVENT_BASE_GET_METHOD)
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*n = "libevent";
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if (!b)
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b = event_base_new();
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*m = event_base_get_method(b);
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# else
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*n = "unknown";
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*m = "not obtainable";
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(void)b;
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# endif
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# ifdef HAVE_EVENT_BASE_FREE
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if (b && b != AS_EVENT_BASE(base))
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event_base_free(b);
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# endif
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#endif
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}
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struct ub_event_base*
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ub_default_event_base(int sigs, time_t* time_secs, struct timeval* time_tv)
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{
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void* base;
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(void)base;
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#ifdef USE_MINI_EVENT
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(void)sigs;
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/* use mini event time-sharing feature */
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base = event_init(time_secs, time_tv);
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#else
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(void)time_secs;
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(void)time_tv;
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# if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
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/* libev */
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if(sigs)
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base = ev_default_loop(EVFLAG_AUTO);
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else
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base = ev_loop_new(EVFLAG_AUTO);
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# else
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(void)sigs;
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# ifdef HAVE_EVENT_BASE_NEW
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base = event_base_new();
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# else
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base = event_init();
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# endif
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# endif
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#endif
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return (struct ub_event_base*)base;
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}
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struct ub_event_base *
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ub_libevent_event_base(struct event_base* libevent_base)
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{
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#ifdef USE_MINI_EVENT
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(void)libevent_base;
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return NULL;
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#else
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return AS_UB_EVENT_BASE(libevent_base);
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#endif
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}
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struct event_base *
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ub_libevent_get_event_base(struct ub_event_base* base)
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{
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#ifdef USE_MINI_EVENT
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(void)base;
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return NULL;
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#else
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return AS_EVENT_BASE(base);
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#endif
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}
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void
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ub_event_base_free(struct ub_event_base* base)
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{
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#ifdef USE_MINI_EVENT
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event_base_free(AS_EVENT_BASE(base));
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#elif defined(HAVE_EVENT_BASE_FREE) && defined(HAVE_EVENT_BASE_ONCE)
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/* only libevent 1.2+ has it, but in 1.2 it is broken -
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assertion fails on signal handling ev that is not deleted
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in libevent 1.3c (event_base_once appears) this is fixed. */
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event_base_free(AS_EVENT_BASE(base));
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#else
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(void)base;
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#endif /* HAVE_EVENT_BASE_FREE and HAVE_EVENT_BASE_ONCE */
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}
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int
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ub_event_base_dispatch(struct ub_event_base* base)
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{
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return event_base_dispatch(AS_EVENT_BASE(base));
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}
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int
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ub_event_base_loopexit(struct ub_event_base* base)
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{
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return event_base_loopexit(AS_EVENT_BASE(base), NULL);
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}
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struct ub_event*
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ub_event_new(struct ub_event_base* base, int fd, short bits,
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void (*cb)(int, short, void*), void* arg)
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{
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struct event *ev = (struct event*)calloc(1, sizeof(struct event));
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if (!ev)
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return NULL;
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event_set(ev, fd, NATIVE_BITS(bits), NATIVE_BITS_CB(cb), arg);
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if (event_base_set(AS_EVENT_BASE(base), ev) != 0) {
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free(ev);
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return NULL;
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}
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return AS_UB_EVENT(ev);
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}
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struct ub_event*
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ub_signal_new(struct ub_event_base* base, int fd,
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void (*cb)(int, short, void*), void* arg)
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{
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struct event *ev = (struct event*)calloc(1, sizeof(struct event));
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if (!ev)
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return NULL;
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signal_set(ev, fd, NATIVE_BITS_CB(cb), arg);
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if (event_base_set(AS_EVENT_BASE(base), ev) != 0) {
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free(ev);
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return NULL;
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}
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return AS_UB_EVENT(ev);
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}
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struct ub_event*
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ub_winsock_register_wsaevent(struct ub_event_base* base, void* wsaevent,
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void (*cb)(int, short, void*), void* arg)
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{
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#if defined(USE_MINI_EVENT) && defined(USE_WINSOCK)
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struct event *ev = (struct event*)calloc(1, sizeof(struct event));
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if (!ev)
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return NULL;
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if (winsock_register_wsaevent(AS_EVENT_BASE(base), ev, wsaevent, cb,
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arg))
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return AS_UB_EVENT(ev);
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free(ev);
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return NULL;
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#else
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(void)base;
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(void)wsaevent;
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(void)cb;
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(void)arg;
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return NULL;
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#endif
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}
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void
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ub_event_add_bits(struct ub_event* ev, short bits)
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{
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AS_EVENT(ev)->ev_events |= NATIVE_BITS(bits);
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}
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void
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ub_event_del_bits(struct ub_event* ev, short bits)
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{
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AS_EVENT(ev)->ev_events &= ~NATIVE_BITS(bits);
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}
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void
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ub_event_set_fd(struct ub_event* ev, int fd)
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{
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AS_EVENT(ev)->ev_fd = fd;
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}
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void
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ub_event_free(struct ub_event* ev)
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{
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if (ev)
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free(AS_EVENT(ev));
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}
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int
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ub_event_add(struct ub_event* ev, struct timeval* tv)
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{
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return event_add(AS_EVENT(ev), tv);
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}
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int
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ub_event_del(struct ub_event* ev)
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{
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return event_del(AS_EVENT(ev));
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}
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int
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ub_timer_add(struct ub_event* ev, struct ub_event_base* base,
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void (*cb)(int, short, void*), void* arg, struct timeval* tv)
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{
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event_set(AS_EVENT(ev), -1, EV_TIMEOUT, NATIVE_BITS_CB(cb), arg);
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if (event_base_set(AS_EVENT_BASE(base), AS_EVENT(ev)) != 0)
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return -1;
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return evtimer_add(AS_EVENT(ev), tv);
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}
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int
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ub_timer_del(struct ub_event* ev)
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{
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return evtimer_del(AS_EVENT(ev));
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}
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int
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ub_signal_add(struct ub_event* ev, struct timeval* tv)
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{
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return signal_add(AS_EVENT(ev), tv);
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}
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int
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ub_signal_del(struct ub_event* ev)
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{
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return signal_del(AS_EVENT(ev));
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}
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void
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ub_winsock_unregister_wsaevent(struct ub_event* ev)
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{
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#if defined(USE_MINI_EVENT) && defined(USE_WINSOCK)
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winsock_unregister_wsaevent(AS_EVENT(ev));
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free(AS_EVENT(ev));
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#else
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(void)ev;
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#endif
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}
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void
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ub_winsock_tcp_wouldblock(struct ub_event* ev, int eventbits)
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{
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#if defined(USE_MINI_EVENT) && defined(USE_WINSOCK)
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winsock_tcp_wouldblock(AS_EVENT(ev), NATIVE_BITS(eventbits));
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#else
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(void)ev;
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(void)eventbits;
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#endif
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}
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void ub_comm_base_now(struct comm_base* cb)
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{
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#ifdef USE_MINI_EVENT
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/** minievent updates the time when it blocks. */
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(void)cb; /* nothing to do */
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#else /* !USE_MINI_EVENT */
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/** fillup the time values in the event base */
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time_t *tt;
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struct timeval *tv;
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comm_base_timept(cb, &tt, &tv);
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if(gettimeofday(tv, NULL) < 0) {
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log_err("gettimeofday: %s", strerror(errno));
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}
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*tt = tv->tv_sec;
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#endif /* USE_MINI_EVENT */
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}
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