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/*
* Copyright 2010 CurveDNS Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY CurveDNS Project ``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 CurveDNS Project 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.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of CurveDNS Project.
*
*/
/*
* $Id$
* $Author$
* $Date$
* $Revision$
*/
#include "event.h"
#include "cache_hashtable.h"
struct ev_loop *event_default_loop = NULL;
static struct ev_io *udp_watchers = NULL;
static struct ev_io *tcp_watchers = NULL;
static int watchers_count; /* as udp_watchers_count = tcp_watchers_count = watchers_count */
static struct ev_signal signal_watcher_hup;
static struct ev_signal signal_watcher_int;
static struct ev_signal signal_watcher_term;
void event_cleanup_entry(struct ev_loop *loop, event_entry_t *entry) {
struct event_general_entry *general_entry;
if (entry) {
general_entry = &entry->general;
if (general_entry->dns.qname) {
free(general_entry->dns.qname);
general_entry->dns.qname = NULL;
}
if (general_entry->buffer) {
free(general_entry->buffer);
general_entry->buffer = NULL;
}
if (general_entry->protocol == IP_PROTOCOL_UDP) {
event_cleanup_udp_entry(loop, &entry->udp);
} else if (general_entry->protocol == IP_PROTOCOL_TCP) {
event_cleanup_tcp_entry(loop, &entry->tcp);
}
}
}
// Starts the accept watchers if startstop = 1, stops them if startstop = 0
void event_tcp_startstop_watchers(struct ev_loop *loop, int startstop) {
int i;
for (i = 0; i < watchers_count; i++) {
if (startstop)
ev_io_start(loop, &tcp_watchers[i]);
else
ev_io_stop(loop, &tcp_watchers[i]);
}
}
static void event_signal_cb(struct ev_loop *loop, ev_signal *w, int revent) {
if (!(revent & EV_SIGNAL))
return;
if (w->signum == SIGHUP) {
debug_log(DEBUG_FATAL, "event_signal_cb(): received SIGHUP - clearing cache\n");
cache_stats(dnscurve_cache);
cache_empty(dnscurve_cache);
} else if ((w->signum == SIGINT) || (w->signum == SIGTERM)) {
debug_log(DEBUG_FATAL, "event_signal_cb(): received %s - cleaning up nicely and quitting\n",
(w->signum == SIGINT) ? "SIGINT" : "SIGTERM");
ev_unloop(EV_DEFAULT_ EVUNLOOP_ALL);
cache_destroy(dnscurve_cache);
ip_close();
} else {
debug_log(DEBUG_WARN, "event_signal_cb(): received unhandled signal\n");
}
}
int event_init() {
int i, j;
// Fetch the default loop:
event_default_loop = ev_default_loop(0);
debug_log(DEBUG_DEBUG, "event_init(): memory size of event_entry_t: %zd\n", sizeof(event_entry_t));
debug_log(DEBUG_INFO, "event_init(): event backend in use: %d (1 = select, 2 = poll, 4 = epoll, 8 = kqueue, 16 = /dev/poll, 32 = port)\n", ev_backend(event_default_loop));
// Attaching signal handlers:
ev_signal_init(&signal_watcher_hup, event_signal_cb, SIGHUP);
ev_signal_init(&signal_watcher_int, event_signal_cb, SIGINT);
ev_signal_init(&signal_watcher_term, event_signal_cb, SIGTERM);
ev_signal_start(event_default_loop, &signal_watcher_hup);
ev_signal_start(event_default_loop, &signal_watcher_int);
ev_signal_start(event_default_loop, &signal_watcher_term);
// Now allocate memory for each of the workers (global_sockets_count is always even):
watchers_count = (int) (global_ip_sockets_count / 2);
udp_watchers = (struct ev_io *) calloc(watchers_count, sizeof(struct ev_io));
if (!udp_watchers)
goto wrong;
tcp_watchers = (struct ev_io *) calloc(watchers_count, sizeof(struct ev_io));
if (!tcp_watchers)
goto wrong;
// Initialize watchers and connect them to the loop:
char s[52];
for (i = 0, j = 0; i < global_ip_sockets_count; i++) {
ip_address_total_string(global_ip_sockets[i].address, s, sizeof(s));
if (global_ip_sockets[i].protocol == IP_PROTOCOL_UDP) {
// UDP socket
debug_log(DEBUG_INFO, "event_init(): udp_watchers[%d] = UDP socket on %s (fd = %d)\n", j, s, global_ip_sockets[i].fd);
udp_watchers[j].data = &global_ip_sockets[i];
ev_io_init(&udp_watchers[j], event_udp_ext_cb, global_ip_sockets[i].fd, EV_READ);
ev_io_start(event_default_loop, &udp_watchers[j]);
} else if (global_ip_sockets[i].protocol == IP_PROTOCOL_TCP) {
// TCP socket
debug_log(DEBUG_INFO, "event_init(): tcp_watchers[%d] = TCP socket on %s (fd = %d)\n", j, s, global_ip_sockets[i].fd);
ev_io_init(&tcp_watchers[j], event_tcp_accept_cb, global_ip_sockets[i].fd, EV_READ);
ev_io_start(event_default_loop, &tcp_watchers[j]);
}
if (i % 2)
j++;
}
return 1;
wrong:
// Bails only out when there's something with memory, so nothing to do with sockets:
if (udp_watchers)
free(udp_watchers);
if (tcp_watchers)
free(tcp_watchers);
return 0;
}
void event_worker() {
debug_log(DEBUG_FATAL, "event_worker(): starting the event loop\n");
ev_loop(event_default_loop, 0);
}
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