tunnel_client.cpp

#include "tunnel.h"

void data_from_local_or_fec_timeout(conn_info_t & conn_info,int is_time_out)
{
	fd64_t &remote_fd64=conn_info.remote_fd64;
	int & local_listen_fd=conn_info.local_listen_fd;

	char data[buf_len];
	int data_len;
	address_t addr;
	u32_t conv;
	int  out_n;char **out_arr;int *out_len;my_time_t *out_delay;
	dest_t dest;
	dest.type=type_fd64;
	dest.inner.fd64=remote_fd64;
	dest.cook=1;

	if(is_time_out)
	{
		//fd64_t fd64=events[idx].data.u64;
		mylog(log_trace,"events[idx].data.u64 == conn_info.fec_encode_manager.get_timer_fd64()\n");

		//uint64_t value;
		//if(!fd_manager.exist(fd64))   //fd64 has been closed
		//{
		//	mylog(log_trace,"!fd_manager.exist(fd64)");
		//	continue;
		//}
		//if((ret=read(fd_manager.to_fd(fd64), &value, 8))!=8)
		//{
		//	mylog(log_trace,"(ret=read(fd_manager.to_fd(fd64), &value, 8))!=8,ret=%d\n",ret);
		//	continue;
		//}
		//if(value==0)
		//{
		//	mylog(log_debug,"value==0\n");
		//	continue;
		//}
		//assert(value==1);
		from_normal_to_fec(conn_info,0,0,out_n,out_arr,out_len,out_delay);
	}
	else//events[idx].data.u64 == (u64_t)local_listen_fd
	{
		mylog(log_trace,"events[idx].data.u64 == (u64_t)local_listen_fd\n");
		address_t::storage_t udp_new_addr_in={0};
		socklen_t udp_new_addr_len = sizeof(address_t::storage_t);
		if ((data_len = recvfrom(local_listen_fd, data, max_data_len+1, 0,
				(struct sockaddr *) &udp_new_addr_in, &udp_new_addr_len)) == -1) {
			mylog(log_debug,"recv_from error,this shouldnt happen,err=%s,but we can try to continue\n",get_sock_error());
			return;
		};

		if(data_len==max_data_len+1)
		{
			mylog(log_warn,"huge packet from upper level, data_len > %d, packet truncated, dropped\n",max_data_len);
			return ;
		}

		if(!disable_mtu_warn&&data_len>=mtu_warn)
		{
			mylog(log_warn,"huge packet,data len=%d (>=%d).strongly suggested to set a smaller mtu at upper level,to get rid of this warn\n ",data_len,mtu_warn);
		}


		addr.from_sockaddr((struct sockaddr *) &udp_new_addr_in,udp_new_addr_len);

		mylog(log_trace,"Received packet from %s, len: %d\n", addr.get_str(),data_len);

		//u64_t u64=ip_port.to_u64();

		if(!conn_info.conv_manager.c.is_data_used(addr))
		{
			if(conn_info.conv_manager.c.get_size() >=max_conv_num)
			{
				mylog(log_warn,"ignored new udp connect bc max_conv_num exceed\n");
				return;
			}
			conv=conn_info.conv_manager.c.get_new_conv();
			conn_info.conv_manager.c.insert_conv(conv,addr);
			mylog(log_info,"new packet from %s,conv_id=%x\n",addr.get_str(),conv);
		}
		else
		{
			conv=conn_info.conv_manager.c.find_conv_by_data(addr);
			mylog(log_trace,"conv=%d\n",conv);
		}
		conn_info.conv_manager.c.update_active_time(conv);
		char * new_data;
		int new_len;
		put_conv(conv,data,data_len,new_data,new_len);


		mylog(log_trace,"data_len=%d new_len=%d\n",data_len,new_len);
		from_normal_to_fec(conn_info,new_data,new_len,out_n,out_arr,out_len,out_delay);

	}
	mylog(log_trace,"out_n=%d\n",out_n);
	for(int i=0;i<out_n;i++)
	{
		delay_send(out_delay[i],dest,out_arr[i],out_len[i]);
	}
}
static void local_listen_cb(struct ev_loop *loop, struct ev_io *watcher, int revents)
{
	assert(!(revents&EV_ERROR));

	conn_info_t & conn_info= *((conn_info_t*)watcher->data);

	data_from_local_or_fec_timeout(conn_info,0);
}

static void remote_cb(struct ev_loop *loop, struct ev_io *watcher, int revents)
{
	assert(!(revents&EV_ERROR));

	conn_info_t & conn_info= *((conn_info_t*)watcher->data);

	char data[buf_len];
	if(!fd_manager.exist(watcher->u64))   //fd64 has been closed
	{
		mylog(log_trace,"!fd_manager.exist(events[idx].data.u64)");
		return;
	}
	fd64_t &remote_fd64=conn_info.remote_fd64;
	int &remote_fd=conn_info.remote_fd;

	assert(watcher->u64==remote_fd64);

	int fd=fd_manager.to_fd(remote_fd64);

	int data_len =recv(fd,data,max_data_len+1,0);

	if(data_len==max_data_len+1)
        {
                mylog(log_warn,"huge packet, data_len > %d, packet truncated, dropped\n",max_data_len);
                return ;
        }


	mylog(log_trace, "received data from udp fd %d, len=%d\n", remote_fd,data_len);
	if(data_len<0)
	{
		if(get_sock_errno()==ECONNREFUSED)
		{
			mylog(log_debug, "recv failed %d ,udp_fd%d,errno:%s\n", data_len,remote_fd,get_sock_error());
		}

		mylog(log_warn, "recv failed %d ,udp_fd%d,errno:%s\n", data_len,remote_fd,get_sock_error());
		return;
	}
	if(!disable_mtu_warn&&data_len>mtu_warn)
	{
		mylog(log_warn,"huge packet,data len=%d (>%d).strongly suggested to set a smaller mtu at upper level,to get rid of this warn\n ",data_len,mtu_warn);
	}

	if(de_cook(data,data_len)!=0)
	{
		mylog(log_debug,"de_cook error");
		return;
	}

	int  out_n;char **out_arr;int *out_len;my_time_t *out_delay;
	from_fec_to_normal(conn_info,data,data_len,out_n,out_arr,out_len,out_delay);

	mylog(log_trace,"out_n=%d\n",out_n);

	for(int i=0;i<out_n;i++)
	{
		u32_t conv;
		char *new_data;
		int new_len;
		if(get_conv(conv,out_arr[i],out_len[i],new_data,new_len)!=0)
		{
			mylog(log_debug,"get_conv(conv,out_arr[i],out_len[i],new_data,new_len)!=0");
			continue;
		}
		if(!conn_info.conv_manager.c.is_conv_used(conv))
		{
			mylog(log_trace,"!conn_info.conv_manager.is_conv_used(conv)");
			continue;
		}

		conn_info.conv_manager.c.update_active_time(conv);

		address_t addr=conn_info.conv_manager.c.find_data_by_conv(conv);
		dest_t dest;
		dest.inner.fd_addr.fd=conn_info.local_listen_fd;
		dest.inner.fd_addr.addr=addr;
		dest.type=type_fd_addr;

		delay_send(out_delay[i],dest,new_data,new_len);
	}
}

static void fifo_cb(struct ev_loop *loop, struct ev_io *watcher, int revents)
{
	assert(!(revents&EV_ERROR));
	int fifo_fd=watcher->fd;

	char buf[buf_len];
	int len=read (fifo_fd, buf, sizeof (buf));
	if(len<0)
	{
		mylog(log_warn,"fifo read failed len=%d,errno=%s\n",len,get_sock_error());
		return;
	}
	buf[len]=0;
	handle_command(buf);
}

static void delay_manager_cb(struct ev_loop *loop, struct ev_timer *watcher, int revents)
{
	assert(!(revents&EV_ERROR));

	//uint64_t value;
	//read(delay_manager.get_timer_fd(), &value, 8);
	//mylog(log_trace,"events[idx].data.u64 == (u64_t)delay_manager.get_timer_fd()\n");

	//do nothing
}

static void fec_encode_cb(struct ev_loop *loop, struct ev_timer *watcher, int revents)
{
	assert(!(revents&EV_ERROR));

	conn_info_t & conn_info= *((conn_info_t*)watcher->data);

	data_from_local_or_fec_timeout(conn_info,1);

}

static void conn_timer_cb(struct ev_loop *loop, struct ev_timer *watcher, int revents)
{
	assert(!(revents&EV_ERROR));

	uint64_t value;

	conn_info_t & conn_info= *((conn_info_t*)watcher->data);

	//read(conn_info.timer.get_timer_fd(), &value, 8);
	conn_info.conv_manager.c.clear_inactive();
	mylog(log_trace,"events[idx].data.u64==(u64_t)conn_info.timer.get_timer_fd()\n");

	conn_info.stat.report_as_client();

	if(debug_force_flush_fec)
	{
		int  out_n;char **out_arr;int *out_len;my_time_t *out_delay;
		dest_t dest;
		dest.type=type_fd64;
		dest.inner.fd64=conn_info.remote_fd64;
		dest.cook=1;
		from_normal_to_fec(conn_info,0,0,out_n,out_arr,out_len,out_delay);
		for(int i=0;i<out_n;i++)
		{
			delay_send(out_delay[i],dest,out_arr[i],out_len[i]);
		}
	}
}

static void prepare_cb(struct ev_loop *loop, struct ev_prepare *watcher, int revents)
{
	assert(!(revents&EV_ERROR));

	delay_manager.check();
}

int tunnel_client_event_loop()
{
	int i, j, k;int ret;
	int yes = 1;
	//int epoll_fd;


    conn_info_t *conn_info_p=new conn_info_t;
    conn_info_t &conn_info=*conn_info_p;  //huge size of conn_info,do not allocate on stack

	int &local_listen_fd=conn_info.local_listen_fd;
    new_listen_socket2(local_listen_fd,local_addr);

	//epoll_fd = epoll_create1(0);
	//assert(epoll_fd>0);

	//const int max_events = 4096;
	//struct epoll_event ev, events[max_events];
	//if (epoll_fd < 0) {
	//	mylog(log_fatal,"epoll return %d\n", epoll_fd);
	//	myexit(-1);
	//}

	struct ev_loop * loop= ev_default_loop(0);
	assert(loop != NULL);

	conn_info.loop=loop;

	//ev.events = EPOLLIN;
	//ev.data.u64 = local_listen_fd;
	//ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, local_listen_fd, &ev);
	//if (ret!=0) {
	//	mylog(log_fatal,"add  udp_listen_fd error\n");
	//	myexit(-1);
	//}
	struct ev_io local_listen_watcher;
	local_listen_watcher.data=&conn_info;

    ev_io_init(&local_listen_watcher, local_listen_cb, local_listen_fd, EV_READ);
    ev_io_start(loop, &local_listen_watcher);

    int & remote_fd=conn_info.remote_fd;
    fd64_t &remote_fd64=conn_info.remote_fd64;

	assert(new_connected_socket2(remote_fd,remote_addr,out_addr,out_interface)==0);
	remote_fd64=fd_manager.create(remote_fd);

	mylog(log_debug,"remote_fd64=%llu\n",remote_fd64);

	//ev.events = EPOLLIN;
	//ev.data.u64 = remote_fd64;

	//ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, remote_fd, &ev);
	//if (ret!= 0) {
	//	mylog(log_fatal,"add raw_fd error\n");
	//	myexit(-1);
	//}

	struct ev_io remote_watcher;
	remote_watcher.data=&conn_info;
	remote_watcher.u64=remote_fd64;

    ev_io_init(&remote_watcher, remote_cb, remote_fd, EV_READ);
    ev_io_start(loop, &remote_watcher);


	//ev.events = EPOLLIN;
	//ev.data.u64 = delay_manager.get_timer_fd();

	//mylog(log_debug,"delay_manager.get_timer_fd()=%d\n",delay_manager.get_timer_fd());
	//ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, delay_manager.get_timer_fd(), &ev);
	//if (ret!= 0) {
	//	mylog(log_fatal,"add delay_manager.get_timer_fd() error\n");
	//	myexit(-1);
	//}

    delay_manager.set_loop_and_cb(loop,delay_manager_cb);

    conn_info.fec_encode_manager.set_data(&conn_info);
    conn_info.fec_encode_manager.set_loop_and_cb(loop,fec_encode_cb);

	//u64_t tmp_fd64=conn_info.fec_encode_manager.get_timer_fd64();
	//ev.events = EPOLLIN;
	//ev.data.u64 = tmp_fd64;

	//mylog(log_debug,"conn_info.fec_encode_manager.get_timer_fd64()=%llu\n",conn_info.fec_encode_manager.get_timer_fd64());
	//ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd_manager.to_fd(tmp_fd64), &ev);
	//if (ret!= 0) {
	//	mylog(log_fatal,"add fec_encode_manager.get_timer_fd64() error\n");
	//	myexit(-1);
	//}

    conn_info.timer.data=&conn_info;
    ev_init(&conn_info.timer,conn_timer_cb);
    ev_timer_set(&conn_info.timer, 0, timer_interval/1000.0 );
    ev_timer_start(loop,&conn_info.timer);
	//conn_info.timer.add_fd_to_epoll(epoll_fd);
	//conn_info.timer.set_timer_repeat_us(timer_interval*1000);

	//mylog(log_debug,"conn_info.timer.get_timer_fd()=%d\n",conn_info.timer.get_timer_fd());




    struct ev_io fifo_watcher;

	int fifo_fd=-1;

	if(fifo_file[0]!=0)
	{
		fifo_fd=create_fifo(fifo_file);
		//ev.events = EPOLLIN;
		//ev.data.u64 = fifo_fd;

		//ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fifo_fd, &ev);
		//if (ret!= 0) {
		//	mylog(log_fatal,"add fifo_fd to epoll error %s\n",strerror(errno));
		//	myexit(-1);
		//}
		mylog(log_info,"fifo_file=%s\n",fifo_file);

	    ev_io_init(&fifo_watcher, fifo_cb, fifo_fd, EV_READ);
	    ev_io_start(loop, &fifo_watcher);

	}

	ev_prepare prepare_watcher;
	ev_init(&prepare_watcher,prepare_cb);
	ev_prepare_start(loop,&prepare_watcher);

	mylog(log_info,"now listening at %s\n",local_addr.get_str());

	ev_run(loop, 0);

	mylog(log_warn,"ev_run returned\n");
	myexit(0);

	/*
	while(1)////////////////////////
	{
		if(about_to_exit) myexit(0);

		int nfds = epoll_wait(epoll_fd, events, max_events, 180 * 1000);
		if (nfds < 0) {  //allow zero
			if(errno==EINTR  )
			{
				mylog(log_info,"epoll interrupted by signal continue\n");
			}
			else
			{
				mylog(log_fatal,"epoll_wait return %d,%s\n", nfds,strerror(errno));
				myexit(-1);
			}
		}
		int idx;
		for (idx = 0; idx < nfds; ++idx) {
			if(events[idx].data.u64==(u64_t)conn_info.timer.get_timer_fd())
			{

			}

			else if (events[idx].data.u64 == (u64_t)fifo_fd)
			{

			}
			else if (events[idx].data.u64 == (u64_t)local_listen_fd||events[idx].data.u64 == conn_info.fec_encode_manager.get_timer_fd64())
			{

			}
		    else if (events[idx].data.u64 == (u64_t)delay_manager.get_timer_fd()) {

			}
			else if(events[idx].data.u64>u32_t(-1) )
			{

			}
			else
			{
				mylog(log_fatal,"unknown fd,this should never happen\n");
				myexit(-1);
			}
		}
		//delay_manager.check();
	}*/
	return 0;
}