/*
 * \brief  Ping-server
 * \author Josef Soentgen
 * \date   2013-01-24
 *
 */

/*
 * Copyright (C) 2013 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU General Public License version 2.
 */

/* Genode includes */
#include <base/printf.h>
#include <util/string.h>
#include <os/config.h>

#include <lwip/genode.h>

/* libc includes */
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdlib.h>

#include "../pingpong.h"

unsigned int verbose;

int
announce(const char *addr)
{
	int s;
	struct sockaddr_in in_addr;

	PLOG("Create new socket...");
	s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (s == -1) {
		PERR("Could not create socket!");
		return -1;
	}

	PLOG("Bind socket to %d", Sport);
	in_addr.sin_port = htons(Sport);
	in_addr.sin_family = AF_INET;
	in_addr.sin_addr.s_addr = inet_addr(addr);
	if ( bind(s, (struct sockaddr *)&in_addr, sizeof (in_addr)) == -1) {
		PERR("Could not bind!");
		close(s);
		return -1;
	}

	return s;
}

int
recvping(const char *addr)
{
	int s, c;

	struct sockaddr caddr;
	socklen_t lcaddr = sizeof (caddr);

	s = announce(addr);
	if (s == -1)
		return -1;

	PLOG("Listen on %s:%d...", addr, Sport);
	if (listen(s, 5) == -1) {
		PERR("Could not listen!");
		close(s);
		return -1;
	}

	while (1) {
		Packet p;
		int act;
		size_t packets;
		ssize_t n;

		PINF("wait...");
		c = accept(s, &caddr, &lcaddr);
		if (c == -1) {
			PERR("Invalid socket from accept()!");
			continue;
		}
		PLOG("client %d connected...", c);

		p.d = (char *)malloc(Databuf);
		if (p.d == NULL) {
			PERR("Out of memeory!");
			close(c);
			break;
		}

		/* receive packets from client */
		act = 1; packets = 0;
		while (act) {
			n = recvpacket(c, &p, p.d, Databuf);
			switch (n) {
			case -1:
				/* error */
				PERR("recvpacket() == -1");
			case 0:
				/* disconnect */
				PERR("disconnect");
				close(c);
				act = 0;
				break;
			default:
				/* check if packet is vaid */
				if (checkpacket(n, &p)) {
					act = 0;
				}
				break;
			}

			if (verbose)
				PINF("%u	%d", p.h.id, n);
		}
		PINF("received packets: %u", packets);

		free(p.d);
	}

	close(s);

	return 0;
}

int
main(int argc, char *argv[])
{
	char listenip[16];

	/* DHCP */
	if (lwip_nic_init(0, 0, 0)) {
		PERR("We got no IP address!");
		return 1;
	}

	verbose = 0;

	Genode::Xml_node argv_node = Genode::config()->xml_node().sub_node("argv");
	try {
		argv_node.attribute("listenip" ).value(listenip, sizeof(listenip));
		argv_node.attribute("verbose").value( &verbose );
	} catch(...) {
		PERR("listenip was not specified!");
		return 1;
	}

	recvping(listenip);

	return 0;
}