libevent https demo

libevent-https.cpp

#include <event2/bufferevent_ssl.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <event2/event.h>
#include <event2/dns.h>

#include <openssl/ssl.h>

#include <iostream>
using namespace std;


const char* uri = "/";
const char* host = "www.google.com";
unsigned short port = 443;


static void request(bufferevent* bev){

	cout << "request" << endl;

	auto out = bufferevent_get_output(bev);
	evbuffer_add_printf(out, "GET %s HTTP/1.1\r\n", uri);
	evbuffer_add_printf(out, "Host:%s:%d\r\n",host, port);
	evbuffer_add_printf(out, "Connection:close\r\n");
	evbuffer_add_printf(out, "\r\n");
}

static void read_cb(bufferevent* bev, void* ptr){

	cout << "read cb" << endl;

	auto input = bufferevent_get_input(bev);
	auto data_len = evbuffer_get_length(input);
	unsigned char* data = evbuffer_pullup(input, -1);

	cout << "data len " << data_len << endl;
	cout << (const char*)data;
	
	evbuffer_drain(input, data_len);
}

static void write_cb(bufferevent* bev, void* ptr){
	cout << "write cb" << endl;
}

static void event_cb(bufferevent* bev, short events, void* ptr){
	if(events & BEV_EVENT_CONNECTED){
		cout << "connected" << endl;
		request(bev);
	}else{
		cout << "diconnected " << events << endl;

	}
}

static void init_ssl(){
	SSL_library_init();
	OpenSSL_add_all_algorithms();
}

int main(){
	

	init_ssl();
	
	auto ssl_ctx = SSL_CTX_new(SSLv23_method());
	auto base = event_base_new();


	auto ssl = SSL_new(ssl_ctx);
	SSL_set_tlsext_host_name(ssl, host); //enable SNI
	auto bev = bufferevent_openssl_socket_new(base, -1, ssl, BUFFEREVENT_SSL_CONNECTING, 
			BEV_OPT_CLOSE_ON_FREE|BEV_OPT_DEFER_CALLBACKS);	//auto free ssl when bev free

	bufferevent_setcb(bev, read_cb, write_cb, event_cb, NULL);

	bufferevent_socket_connect_hostname(bev, NULL, AF_INET, host, port); 
	
	event_base_dispatch(base);

	bufferevent_free(bev);
	event_base_free(base);

	SSL_CTX_free(ssl_ctx);

	return 0;
}

build on bufferevent, not evhttp.