1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/c++/domain-socket-bridge/domain-socket-bridge.c	Fri Nov 18 21:41:23 2016 +0100
     1.3 @@ -0,0 +1,113 @@
     1.4 +#include <string.h>
     1.5 +#include <errno.h>
     1.6 +#include <stdio.h>
     1.7 +#include <signal.h>
     1.8 +
     1.9 +#include <event2/bufferevent.h>
    1.10 +#include <event2/buffer.h>
    1.11 +#include <event2/listener.h>
    1.12 +#include <event2/util.h>
    1.13 +#include <event2/event.h>
    1.14 +
    1.15 +static const char MESSAGE[] = "Hello, World!\n";
    1.16 +
    1.17 +static const int PORT = 9995;
    1.18 +
    1.19 +static void listener_cb(struct evconnlistener *, evutil_socket_t,
    1.20 +		struct sockaddr *, int socklen, void *);
    1.21 +static void conn_write_cb(struct bufferevent *, void *);
    1.22 +static void conn_event_cb(struct bufferevent *, short, void *);
    1.23 +static void signal_cb(evutil_socket_t, short, void *);
    1.24 +
    1.25 +int main(int argc, char **argv) {
    1.26 +	struct event_base *base;
    1.27 +	struct evconnlistener *listener;
    1.28 +	struct event *signal_event;
    1.29 +
    1.30 +	struct sockaddr_in sin;
    1.31 +
    1.32 +	base = event_base_new();
    1.33 +	if (!base) {
    1.34 +		fprintf(stderr, "Could not initialize libevent!\n");
    1.35 +		return 1;
    1.36 +	}
    1.37 +
    1.38 +	memset(&sin, 0, sizeof (sin));
    1.39 +	sin.sin_family = AF_INET;
    1.40 +	sin.sin_port = htons(PORT);
    1.41 +
    1.42 +	listener = evconnlistener_new_bind(base, listener_cb, (void *) base,
    1.43 +			LEV_OPT_REUSEABLE | LEV_OPT_CLOSE_ON_FREE, -1,
    1.44 +			(struct sockaddr*) &sin,
    1.45 +			sizeof (sin));
    1.46 +
    1.47 +	if (!listener) {
    1.48 +		fprintf(stderr, "Could not create a listener!\n");
    1.49 +		return 1;
    1.50 +	}
    1.51 +
    1.52 +	signal_event = evsignal_new(base, SIGINT, signal_cb, (void *) base);
    1.53 +
    1.54 +	if (!signal_event || event_add(signal_event, NULL) < 0) {
    1.55 +		fprintf(stderr, "Could not create/add a signal event!\n");
    1.56 +		return 1;
    1.57 +	}
    1.58 +
    1.59 +	event_base_dispatch(base);
    1.60 +
    1.61 +	evconnlistener_free(listener);
    1.62 +	event_free(signal_event);
    1.63 +	event_base_free(base);
    1.64 +
    1.65 +	printf("done\n");
    1.66 +	return 0;
    1.67 +}
    1.68 +
    1.69 +static void listener_cb(struct evconnlistener *listener, evutil_socket_t fd, struct sockaddr *sa, int socklen, void *user_data) {
    1.70 +	struct event_base *base = (event_base *) user_data;
    1.71 +	struct bufferevent *bev;
    1.72 +
    1.73 +	bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE); // zavírá spojení
    1.74 +	//bev = bufferevent_socket_new(base, fd, 0); // nezavírá spojení
    1.75 +	if (!bev) {
    1.76 +		fprintf(stderr, "Error constructing bufferevent!");
    1.77 +		event_base_loopbreak(base);
    1.78 +		return;
    1.79 +	}
    1.80 +	bufferevent_setcb(bev, NULL, conn_write_cb, conn_event_cb, NULL);
    1.81 +	bufferevent_enable(bev, EV_WRITE);
    1.82 +	bufferevent_disable(bev, EV_READ);
    1.83 +
    1.84 +	printf("někdo se k nám připojil! / %p\n", bev);
    1.85 +
    1.86 +	bufferevent_write(bev, MESSAGE, strlen(MESSAGE));
    1.87 +}
    1.88 +
    1.89 +static void conn_write_cb(struct bufferevent *bev, void *user_data) {
    1.90 +	struct evbuffer *output = bufferevent_get_output(bev);
    1.91 +	if (evbuffer_get_length(output) == 0) {
    1.92 +		printf("flushed answer / %p\n", bev);
    1.93 +		bufferevent_free(bev);
    1.94 +	}
    1.95 +}
    1.96 +
    1.97 +static void conn_event_cb(struct bufferevent *bev, short events, void *user_data) {
    1.98 +	if (events & BEV_EVENT_EOF) {
    1.99 +		printf("Connection closed.\n");
   1.100 +	} else if (events & BEV_EVENT_ERROR) {
   1.101 +		printf("Got an error on the connection: %s\n",
   1.102 +				strerror(errno)); /*XXX win32*/
   1.103 +	}
   1.104 +	
   1.105 +	// None of the other events can happen here, since we haven't enabled timeouts
   1.106 +	bufferevent_free(bev);
   1.107 +}
   1.108 +
   1.109 +static void signal_cb(evutil_socket_t sig, short events, void *user_data) {
   1.110 +	struct event_base *base = (event_base *) user_data;
   1.111 +	struct timeval delay = {2, 123};
   1.112 +
   1.113 +	printf("Zachycen SIGINT (Ctrl+C); ukončuji program během %ld sekund a %ld mikrosekund.\n", delay.tv_sec, delay.tv_usec);
   1.114 +
   1.115 +	event_base_loopexit(base, &delay);
   1.116 +}