File: lhnet.c

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// Written by Forest Hale 2003-06-15 and placed into public domain.

#ifdef WIN32
#ifdef _MSC_VER
#pragma comment(lib, "ws2_32.lib")
#endif
# ifndef NOSUPPORTIPV6
// Windows XP or higher is required for getaddrinfo, but the inclusion of wspiapi provides fallbacks for older versions
# define _WIN32_WINNT 0x0501
# endif
# include <winsock2.h>
# include <ws2tcpip.h>
# ifdef USE_WSPIAPI_H
#  include <wspiapi.h>
# endif
#endif

#ifndef STANDALONETEST
#include "quakedef.h"
#endif

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#ifndef WIN32
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifndef NOSUPPORTIPV6
#include <net/if.h>
#endif
#endif

#ifdef __MORPHOS__
#include <proto/socket.h>
#endif

// for Z_Malloc/Z_Free in quake
#ifndef STANDALONETEST
#include "zone.h"
#include "sys.h"
#include "netconn.h"
#else
#define Con_Print printf
#define Con_Printf printf
#define Z_Malloc malloc
#define Z_Free free
#endif

#include "lhnet.h"

#if defined(WIN32)
// as of Visual Studio 2015, EWOULDBLOCK and ECONNREFUSED are real things, with different values than we want when talking to WinSock, so we have to undef them here or change the rest of the code.
#undef EWOULDBLOCK
#undef ECONNREFUSED
#define EWOULDBLOCK WSAEWOULDBLOCK
#define ECONNREFUSED WSAECONNREFUSED

#define SOCKETERRNO WSAGetLastError()

#define IOC_VENDOR 0x18000000
#define _WSAIOW(x,y) (IOC_IN|(x)|(y))
#define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)

#define SOCKLEN_T int
#elif defined(__MORPHOS__)
#define ioctlsocket IoctlSocket
#define closesocket CloseSocket
#define SOCKETERRNO Errno()

#define SOCKLEN_T int
#else
#define ioctlsocket ioctl
#define closesocket close
#define SOCKETERRNO errno

#define SOCKLEN_T socklen_t
#endif

#ifdef MSG_DONTWAIT
#define LHNET_RECVFROM_FLAGS MSG_DONTWAIT
#define LHNET_SENDTO_FLAGS 0
#else
#define LHNET_RECVFROM_FLAGS 0
#define LHNET_SENDTO_FLAGS 0
#endif

typedef struct lhnetaddressnative_s
{
	lhnetaddresstype_t addresstype;
	int port;
	union
	{
		struct sockaddr sock;
		struct sockaddr_in in;
#ifndef NOSUPPORTIPV6
		struct sockaddr_in6 in6;
#endif
	}
	addr;
}
lhnetaddressnative_t;

// to make LHNETADDRESS_FromString resolve repeated hostnames faster, cache them
#define MAX_NAMECACHE 64
static struct namecache_s
{
	lhnetaddressnative_t address;
	double expirationtime;
	char name[64];
}
namecache[MAX_NAMECACHE];
static int namecacheposition = 0;

int LHNETADDRESS_FromPort(lhnetaddress_t *vaddress, lhnetaddresstype_t addresstype, int port)
{
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
	if (!address)
		return 0;
	switch(addresstype)
	{
	default:
		break;
	case LHNETADDRESSTYPE_LOOP:
		// local:port  (loopback)
		memset(address, 0, sizeof(*address));
		address->addresstype = LHNETADDRESSTYPE_LOOP;
		address->port = port;
		return 1;
	case LHNETADDRESSTYPE_INET4:
		// 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
		memset(address, 0, sizeof(*address));
		address->addresstype = LHNETADDRESSTYPE_INET4;
		address->port = port;
		address->addr.in.sin_family = AF_INET;
		address->addr.in.sin_port = htons((unsigned short)port);
		return 1;
#ifndef NOSUPPORTIPV6
	case LHNETADDRESSTYPE_INET6:
		// [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
		memset(address, 0, sizeof(*address));
		address->addresstype = LHNETADDRESSTYPE_INET6;
		address->port = port;
		address->addr.in6.sin6_family = AF_INET6;
		address->addr.in6.sin6_port = htons((unsigned short)port);
		return 1;
#endif
	}
	return 0;
}

#ifndef NOSUPPORTIPV6
static int LHNETADDRESS_Resolve(lhnetaddressnative_t *address, const char *name, int port)
{
	char port_buff [16];
	struct addrinfo hints;
	struct addrinfo* addrinf;
	int err;

	dpsnprintf (port_buff, sizeof (port_buff), "%d", port);
	port_buff[sizeof (port_buff) - 1] = '\0';

	memset(&hints, 0, sizeof (hints));
	hints.ai_family = AF_UNSPEC;
	hints.ai_socktype = SOCK_DGRAM;
	//hints.ai_flags = AI_PASSIVE;

	err = getaddrinfo(name, port_buff, &hints, &addrinf);
	if (err != 0 || addrinf == NULL)
		return 0;
	if (addrinf->ai_addr->sa_family != AF_INET6 && addrinf->ai_addr->sa_family != AF_INET)
	{
		freeaddrinfo (addrinf);
		return 0;
	}

	// great it worked
	if (addrinf->ai_addr->sa_family == AF_INET6)
	{
		address->addresstype = LHNETADDRESSTYPE_INET6;
		memcpy(&address->addr.in6, addrinf->ai_addr, sizeof(address->addr.in6));
	}
	else
	{
		address->addresstype = LHNETADDRESSTYPE_INET4;
		memcpy(&address->addr.in, addrinf->ai_addr, sizeof(address->addr.in));
	}
	address->port = port;
	
	freeaddrinfo (addrinf);
	return 1;
}

int LHNETADDRESS_FromString(lhnetaddress_t *vaddress, const char *string, int defaultport)
{
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
	int i, port, d1, d2, d3, d4, resolved;
	size_t namelen;
	unsigned char *a;
	char name[128];
#ifdef STANDALONETEST
	char string2[128];
#endif
	const char* addr_start;
	const char* addr_end = NULL;
	const char* port_name = NULL;
	int addr_family = AF_UNSPEC;

	if (!address || !string || !*string)
		return 0;
	memset(address, 0, sizeof(*address));
	address->addresstype = LHNETADDRESSTYPE_NONE;
	port = 0;

	// If it's a bracketed IPv6 address
	if (string[0] == '[')
	{
		const char* end_bracket = strchr(string, ']');

		if (end_bracket == NULL)
			return 0;

		if (end_bracket[1] == ':')
			port_name = end_bracket + 2;
		else if (end_bracket[1] != '\0')
			return 0;

		addr_family = AF_INET6;
		addr_start = &string[1];
		addr_end = end_bracket;
	}
	else
	{
		const char* first_colon;

		addr_start = string;

		// If it's a numeric non-bracket IPv6 address (-> no port),
		// or it's a numeric IPv4 address, or a name, with a port
		first_colon = strchr(string, ':');
		if (first_colon != NULL)
		{
			const char* last_colon = strrchr(first_colon + 1, ':');

			// If it's an numeric IPv4 address, or a name, with a port
			if (last_colon == NULL)
			{
				addr_end = first_colon;
				port_name = first_colon + 1;
			}
			else
				addr_family = AF_INET6;
		}
	}

	if (addr_end != NULL)
		namelen = addr_end - addr_start;
	else
		namelen = strlen (addr_start);

	if (namelen >= sizeof(name))
		namelen = sizeof(name) - 1;
	memcpy (name, addr_start, namelen);
	name[namelen] = 0;

	if (port_name)
		port = atoi(port_name);

	if (port == 0)
		port = defaultport;

	// handle loopback
	if (!strcmp(name, "local"))
	{
		address->addresstype = LHNETADDRESSTYPE_LOOP;
		address->port = port;
		return 1;
	}
	// try to parse as dotted decimal ipv4 address first
	// note this supports partial ip addresses
	d1 = d2 = d3 = d4 = 0;
#if _MSC_VER >= 1400
#define sscanf sscanf_s
#endif
	if (addr_family != AF_INET6 &&
		sscanf(name, "%d.%d.%d.%d", &d1, &d2, &d3, &d4) >= 1 && (unsigned int)d1 < 256 && (unsigned int)d2 < 256 && (unsigned int)d3 < 256 && (unsigned int)d4 < 256)
	{
		// parsed a valid ipv4 address
		address->addresstype = LHNETADDRESSTYPE_INET4;
		address->port = port;
		address->addr.in.sin_family = AF_INET;
		address->addr.in.sin_port = htons((unsigned short)port);
		a = (unsigned char *)&address->addr.in.sin_addr;
		a[0] = d1;
		a[1] = d2;
		a[2] = d3;
		a[3] = d4;
#ifdef STANDALONETEST
		LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
		printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %s\n", string, string2);
#endif
		return 1;
	}
	for (i = 0;i < MAX_NAMECACHE;i++)
		if (!strcmp(namecache[i].name, name))
			break;
#ifdef STANDALONETEST
	if (i < MAX_NAMECACHE)
#else
	if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
#endif
	{
		*address = namecache[i].address;
		address->port = port;
		if (address->addresstype == LHNETADDRESSTYPE_INET6)
		{
			address->addr.in6.sin6_port = htons((unsigned short)port);
			return 1;
		}
		else if (address->addresstype == LHNETADDRESSTYPE_INET4)
		{
			address->addr.in.sin_port = htons((unsigned short)port);
			return 1;
		}
		return 0;
	}

	for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
		namecache[namecacheposition].name[i] = name[i];
	namecache[namecacheposition].name[i] = 0;
#ifndef STANDALONETEST
	namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
#endif

	// try resolving the address (handles dns and other ip formats)
	resolved = LHNETADDRESS_Resolve(address, name, port);
	if (resolved)
	{
#ifdef STANDALONETEST
		const char *protoname;

		switch (address->addresstype)
		{
			case LHNETADDRESSTYPE_INET6:
				protoname = "ipv6";
				break;
			case LHNETADDRESSTYPE_INET4:
				protoname = "ipv4";
				break;
			default:
				protoname = "UNKNOWN";
				break;
		}
		LHNETADDRESS_ToString(vaddress, string2, sizeof(string2), 1);
		Con_Printf("LHNETADDRESS_Resolve(\"%s\") returned %s address %s\n", string, protoname, string2);
#endif
		namecache[namecacheposition].address = *address;
	}
	else
	{
#ifdef STANDALONETEST
		printf("name resolution failed on address \"%s\"\n", name);
#endif
		namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
	}
	
	namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
	return resolved;
}
#else
int LHNETADDRESS_FromString(lhnetaddress_t *vaddress, const char *string, int defaultport)
{
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
	int i, port, namelen, d1, d2, d3, d4;
	struct hostent *hostentry;
	unsigned char *a;
	const char *colon;
	char name[128];
#ifdef STANDALONETEST
	char string2[128];
#endif
	if (!address || !string || !*string)
		return 0;
	memset(address, 0, sizeof(*address));
	address->addresstype = LHNETADDRESSTYPE_NONE;
	port = 0;
	colon = strrchr(string, ':');
	if (colon && (colon == strchr(string, ':') || (string[0] == '[' && colon - string > 0 && colon[-1] == ']')))
	//           EITHER: colon is the ONLY colon  OR: colon comes after [...] delimited IPv6 address
	//           fixes misparsing of IPv6 addresses without port
	{
		port = atoi(colon + 1);
	}
	else
		colon = string + strlen(string);
	if (port == 0)
		port = defaultport;
	namelen = colon - string;
	if (namelen > 127)
		namelen = 127;
	if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
	{
		string++;
		namelen -= 2;
	}
	memcpy(name, string, namelen);
	name[namelen] = 0;
	// handle loopback
	if (!strcmp(name, "local"))
	{
		address->addresstype = LHNETADDRESSTYPE_LOOP;
		address->port = port;
		return 1;
	}
	// try to parse as dotted decimal ipv4 address first
	// note this supports partial ip addresses
	d1 = d2 = d3 = d4 = 0;
#if _MSC_VER >= 1400
#define sscanf sscanf_s
#endif
	if (sscanf(name, "%d.%d.%d.%d", &d1, &d2, &d3, &d4) >= 1 && (unsigned int)d1 < 256 && (unsigned int)d2 < 256 && (unsigned int)d3 < 256 && (unsigned int)d4 < 256)
	{
		// parsed a valid ipv4 address
		address->addresstype = LHNETADDRESSTYPE_INET4;
		address->port = port;
		address->addr.in.sin_family = AF_INET;
		address->addr.in.sin_port = htons((unsigned short)port);
		a = (unsigned char *)&address->addr.in.sin_addr;
		a[0] = d1;
		a[1] = d2;
		a[2] = d3;
		a[3] = d4;
#ifdef STANDALONETEST
		LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
		printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %s\n", string, string2);
#endif
		return 1;
	}
	for (i = 0;i < MAX_NAMECACHE;i++)
		if (!strcmp(namecache[i].name, name))
			break;
#ifdef STANDALONETEST
	if (i < MAX_NAMECACHE)
#else
	if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
#endif
	{
		*address = namecache[i].address;
		address->port = port;
		if (address->addresstype == LHNETADDRESSTYPE_INET6)
		{
#ifndef NOSUPPORTIPV6
			address->addr.in6.sin6_port = htons((unsigned short)port);
			return 1;
#endif
		}
		else if (address->addresstype == LHNETADDRESSTYPE_INET4)
		{
			address->addr.in.sin_port = htons((unsigned short)port);
			return 1;
		}
		return 0;
	}
	// try gethostbyname (handles dns and other ip formats)
	hostentry = gethostbyname(name);
	if (hostentry)
	{
		if (hostentry->h_addrtype == AF_INET6)
		{
#ifndef NOSUPPORTIPV6
			// great it worked
			address->addresstype = LHNETADDRESSTYPE_INET6;
			address->port = port;
			address->addr.in6.sin6_family = hostentry->h_addrtype;
			address->addr.in6.sin6_port = htons((unsigned short)port);
			memcpy(&address->addr.in6.sin6_addr, hostentry->h_addr_list[0], sizeof(address->addr.in6.sin6_addr));
			for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
				namecache[namecacheposition].name[i] = name[i];
			namecache[namecacheposition].name[i] = 0;
#ifndef STANDALONETEST
			namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
#endif
			namecache[namecacheposition].address = *address;
			namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
#ifdef STANDALONETEST
			LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
			printf("gethostbyname(\"%s\") returned ipv6 address %s\n", string, string2);
#endif
			return 1;
#endif
		}
		else if (hostentry->h_addrtype == AF_INET)
		{
			// great it worked
			address->addresstype = LHNETADDRESSTYPE_INET4;
			address->port = port;
			address->addr.in.sin_family = hostentry->h_addrtype;
			address->addr.in.sin_port = htons((unsigned short)port);
			memcpy(&address->addr.in.sin_addr, hostentry->h_addr_list[0], sizeof(address->addr.in.sin_addr));
			for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
				namecache[namecacheposition].name[i] = name[i];
			namecache[namecacheposition].name[i] = 0;
#ifndef STANDALONETEST
			namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
#endif
			namecache[namecacheposition].address = *address;
			namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
#ifdef STANDALONETEST
			LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
			printf("gethostbyname(\"%s\") returned ipv4 address %s\n", string, string2);
#endif
			return 1;
		}
	}
#ifdef STANDALONETEST
	printf("gethostbyname failed on address \"%s\"\n", name);
#endif
	for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
		namecache[namecacheposition].name[i] = name[i];
	namecache[namecacheposition].name[i] = 0;
#ifndef STANDALONETEST
	namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
#endif
	namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
	namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
	return 0;
}
#endif

int LHNETADDRESS_ToString(const lhnetaddress_t *vaddress, char *string, int stringbuffersize, int includeport)
{
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
	const unsigned char *a;
	if (!address || !string || stringbuffersize < 1)
		return 0;
	*string = 0;
	switch(address->addresstype)
	{
	default:
		break;
	case LHNETADDRESSTYPE_LOOP:
		if (includeport)
		{
			if (stringbuffersize >= 12)
			{
				dpsnprintf(string, stringbuffersize, "local:%d", address->port);
				return 1;
			}
		}
		else
		{
			if (stringbuffersize >= 6)
			{
				memcpy(string, "local", 6);
				return 1;
			}
		}
		break;
	case LHNETADDRESSTYPE_INET4:
		a = (const unsigned char *)(&address->addr.in.sin_addr);
		if (includeport)
		{
			if (stringbuffersize >= 22)
			{
				dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d:%d", a[0], a[1], a[2], a[3], address->port);
				return 1;
			}
		}
		else
		{
			if (stringbuffersize >= 16)
			{
				dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
				return 1;
			}
		}
		break;
#ifndef NOSUPPORTIPV6
	case LHNETADDRESSTYPE_INET6:
		a = (const unsigned char *)(&address->addr.in6.sin6_addr);
		if (includeport)
		{
			if (stringbuffersize >= 88)
			{
				dpsnprintf(string, stringbuffersize, "[%x:%x:%x:%x:%x:%x:%x:%x]:%d", a[0] * 256 + a[1], a[2] * 256 + a[3], a[4] * 256 + a[5], a[6] * 256 + a[7], a[8] * 256 + a[9], a[10] * 256 + a[11], a[12] * 256 + a[13], a[14] * 256 + a[15], address->port);
				return 1;
			}
		}
		else
		{
			if (stringbuffersize >= 80)
			{
				dpsnprintf(string, stringbuffersize, "%x:%x:%x:%x:%x:%x:%x:%x", a[0] * 256 + a[1], a[2] * 256 + a[3], a[4] * 256 + a[5], a[6] * 256 + a[7], a[8] * 256 + a[9], a[10] * 256 + a[11], a[12] * 256 + a[13], a[14] * 256 + a[15]);
				return 1;
			}
		}
		break;
#endif
	}
	return 0;
}

int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
{
	if (address)
		return address->addresstype;
	else
		return LHNETADDRESSTYPE_NONE;
}

const char *LHNETADDRESS_GetInterfaceName(const lhnetaddress_t *vaddress, char *ifname, size_t ifnamelength)
{
#ifndef NOSUPPORTIPV6
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;

	if (address && address->addresstype == LHNETADDRESSTYPE_INET6)
	{
#ifndef _WIN32

		if (if_indextoname(address->addr.in6.sin6_scope_id, ifname) == ifname)
			return ifname;

#else

		// The Win32 API doesn't have if_indextoname() until Windows Vista,
		// but luckily it just uses the interface ID as the interface name

		if (dpsnprintf(ifname, ifnamelength, "%lu", address->addr.in6.sin6_scope_id) > 0)
			return ifname;

#endif
	}
#endif

	return NULL;
}

int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
{
	if (!address)
		return -1;
	return address->port;
}

int LHNETADDRESS_SetPort(lhnetaddress_t *vaddress, int port)
{
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
	if (!address)
		return 0;
	address->port = port;
	switch(address->addresstype)
	{
	case LHNETADDRESSTYPE_LOOP:
		return 1;
	case LHNETADDRESSTYPE_INET4:
		address->addr.in.sin_port = htons((unsigned short)port);
		return 1;
#ifndef NOSUPPORTIPV6
	case LHNETADDRESSTYPE_INET6:
		address->addr.in6.sin6_port = htons((unsigned short)port);
		return 1;
#endif
	default:
		return 0;
	}
}

int LHNETADDRESS_Compare(const lhnetaddress_t *vaddress1, const lhnetaddress_t *vaddress2)
{
	lhnetaddressnative_t *address1 = (lhnetaddressnative_t *)vaddress1;
	lhnetaddressnative_t *address2 = (lhnetaddressnative_t *)vaddress2;
	if (!address1 || !address2)
		return 1;
	if (address1->addresstype != address2->addresstype)
		return 1;
	switch(address1->addresstype)
	{
	case LHNETADDRESSTYPE_LOOP:
		if (address1->port != address2->port)
			return -1;
		return 0;
	case LHNETADDRESSTYPE_INET4:
		if (address1->addr.in.sin_family != address2->addr.in.sin_family)
			return 1;
		if (memcmp(&address1->addr.in.sin_addr, &address2->addr.in.sin_addr, sizeof(address1->addr.in.sin_addr)))
			return 1;
		if (address1->port != address2->port)
			return -1;
		return 0;
#ifndef NOSUPPORTIPV6
	case LHNETADDRESSTYPE_INET6:
		if (address1->addr.in6.sin6_family != address2->addr.in6.sin6_family)
			return 1;
		if (memcmp(&address1->addr.in6.sin6_addr, &address2->addr.in6.sin6_addr, sizeof(address1->addr.in6.sin6_addr)))
			return 1;
		if (address1->port != address2->port)
			return -1;
		return 0;
#endif
	default:
		return 1;
	}
}

typedef struct lhnetpacket_s
{
	void *data;
	int length;
	int sourceport;
	int destinationport;
	time_t timeout;
#ifndef STANDALONETEST
	double sentdoubletime;
#endif
	struct lhnetpacket_s *next, *prev;
}
lhnetpacket_t;

static int lhnet_active;
static lhnetsocket_t lhnet_socketlist;
static lhnetpacket_t lhnet_packetlist;
static int lhnet_default_dscp = 0;
#ifdef WIN32
static int lhnet_didWSAStartup = 0;
static WSADATA lhnet_winsockdata;
#endif

void LHNET_Init(void)
{
	if (lhnet_active)
		return;
	lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
	lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
	lhnet_active = 1;
#ifdef WIN32
	lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
	if (!lhnet_didWSAStartup)
		Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
#endif
}

int LHNET_DefaultDSCP(int dscp)
{
#ifdef IP_TOS
	int prev = lhnet_default_dscp;
	if(dscp >= 0)
		lhnet_default_dscp = dscp;
	return prev;
#else
	return -1;
#endif
}

void LHNET_Shutdown(void)
{
	lhnetpacket_t *p;
	if (!lhnet_active)
		return;
	while (lhnet_socketlist.next != &lhnet_socketlist)
		LHNET_CloseSocket(lhnet_socketlist.next);
	while (lhnet_packetlist.next != &lhnet_packetlist)
	{
		p = lhnet_packetlist.next;
		p->prev->next = p->next;
		p->next->prev = p->prev;
		Z_Free(p);
	}
#ifdef WIN32
	if (lhnet_didWSAStartup)
	{
		lhnet_didWSAStartup = 0;
		WSACleanup();
	}
#endif
	lhnet_active = 0;
}

static const char *LHNETPRIVATE_StrError(void)
{
#ifdef WIN32
	int i = WSAGetLastError();
	switch (i)
	{
		case WSAEINTR:           return "WSAEINTR";
		case WSAEBADF:           return "WSAEBADF";
		case WSAEACCES:          return "WSAEACCES";
		case WSAEFAULT:          return "WSAEFAULT";
		case WSAEINVAL:          return "WSAEINVAL";
		case WSAEMFILE:          return "WSAEMFILE";
		case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
		case WSAEINPROGRESS:     return "WSAEINPROGRESS";
		case WSAEALREADY:        return "WSAEALREADY";
		case WSAENOTSOCK:        return "WSAENOTSOCK";
		case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
		case WSAEMSGSIZE:        return "WSAEMSGSIZE";
		case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
		case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
		case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
		case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
		case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
		case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
		case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
		case WSAEADDRINUSE:      return "WSAEADDRINUSE";
		case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
		case WSAENETDOWN:        return "WSAENETDOWN";
		case WSAENETUNREACH:     return "WSAENETUNREACH";
		case WSAENETRESET:       return "WSAENETRESET";
		case WSAECONNABORTED:    return "WSAECONNABORTED";
		case WSAECONNRESET:      return "WSAECONNRESET";
		case WSAENOBUFS:         return "WSAENOBUFS";
		case WSAEISCONN:         return "WSAEISCONN";
		case WSAENOTCONN:        return "WSAENOTCONN";
		case WSAESHUTDOWN:       return "WSAESHUTDOWN";
		case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
		case WSAETIMEDOUT:       return "WSAETIMEDOUT";
		case WSAECONNREFUSED:    return "WSAECONNREFUSED";
		case WSAELOOP:           return "WSAELOOP";
		case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
		case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
		case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
		case WSAENOTEMPTY:       return "WSAENOTEMPTY";
		case WSAEPROCLIM:        return "WSAEPROCLIM";
		case WSAEUSERS:          return "WSAEUSERS";
		case WSAEDQUOT:          return "WSAEDQUOT";
		case WSAESTALE:          return "WSAESTALE";
		case WSAEREMOTE:         return "WSAEREMOTE";
		case WSAEDISCON:         return "WSAEDISCON";
		case 0:                  return "no error";
		default:                 return "unknown WSAE error";
	}
#else
	return strerror(errno);
#endif
}

void LHNET_SleepUntilPacket_Microseconds(int microseconds)
{
#ifdef FD_SET
	fd_set fdreadset;
	struct timeval tv;
	int lastfd;
	lhnetsocket_t *s;
	FD_ZERO(&fdreadset);
	lastfd = 0;
	for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
	{
		if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
		{
			if (lastfd < s->inetsocket)
				lastfd = s->inetsocket;
#if defined(WIN32) && !defined(_MSC_VER)
			FD_SET((int)s->inetsocket, &fdreadset);
#else
			FD_SET((unsigned int)s->inetsocket, &fdreadset);
#endif
		}
	}
	tv.tv_sec = microseconds / 1000000;
	tv.tv_usec = microseconds % 1000000;
	select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
#else
	Sys_Sleep(microseconds);
#endif
}

lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
{
	lhnetsocket_t *lhnetsocket, *s;
	if (!address)
		return NULL;
	lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
	if (lhnetsocket)
	{
		memset(lhnetsocket, 0, sizeof(*lhnetsocket));
		lhnetsocket->address = *address;
		switch(lhnetsocket->address.addresstype)
		{
		case LHNETADDRESSTYPE_LOOP:
			if (lhnetsocket->address.port == 0)
			{
				// allocate a port dynamically
				// this search will always terminate because there is never
				// an allocated socket with port 0, so if the number wraps it
				// will find the port is unused, and then refuse to use port
				// 0, causing an intentional failure condition
				lhnetsocket->address.port = 1024;
				for (;;)
				{
					for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
						if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
							break;
					if (s == &lhnet_socketlist)
						break;
					lhnetsocket->address.port++;
				}
			}
			// check if the port is available
			for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
				if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
					break;
			if (s == &lhnet_socketlist && lhnetsocket->address.port != 0)
			{
				lhnetsocket->next = &lhnet_socketlist;
				lhnetsocket->prev = lhnetsocket->next->prev;
				lhnetsocket->next->prev = lhnetsocket;
				lhnetsocket->prev->next = lhnetsocket;
				return lhnetsocket;
			}
			break;
		case LHNETADDRESSTYPE_INET4:
#ifndef NOSUPPORTIPV6
		case LHNETADDRESSTYPE_INET6:
#endif
#ifdef WIN32
			if (lhnet_didWSAStartup)
			{
#endif
#ifndef NOSUPPORTIPV6
				if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? PF_INET6 : PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
#else
				if ((lhnetsocket->inetsocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
#endif
				{
#ifdef WIN32
					u_long _false = 0;
#endif
#ifdef MSG_DONTWAIT
					if (1)
#else
#ifdef WIN32
					u_long _true = 1;
#else
					char _true = 1;
#endif
					if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
#endif
					{
#ifdef IPV6_V6ONLY
						// We need to set this flag to tell the OS that we only listen on IPv6. If we don't
						// most OSes will create a dual-protocol socket that also listens on IPv4. In this case
						// if an IPv4 socket is already bound to the port we want, our bind() call will fail.
						int ipv6_only = 1;
						if (address->addresstype != LHNETADDRESSTYPE_INET6
							|| setsockopt (lhnetsocket->inetsocket, IPPROTO_IPV6, IPV6_V6ONLY,
										   (const char *)&ipv6_only, sizeof(ipv6_only)) == 0
#ifdef WIN32
							// The Win32 API only supports IPV6_V6ONLY since Windows Vista, but fortunately
							// the default value is what we want on Win32 anyway (IPV6_V6ONLY = true)
							|| SOCKETERRNO == WSAENOPROTOOPT
#endif
							)
#endif
						{
							lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
							SOCKLEN_T namelen;
							int bindresult;

#if defined(SOL_RFC1149) && defined(RFC1149_1149ONLY)
							// we got reports of massive lags when this protocol was chosen as transport
							// so better turn it off
							{
								int rfc1149only = 0;
								int rfc1149enabled = 0;
								if(setsockopt(lhnetsocket->inetsocket, SOL_RFC1149, RFC1149_1149ONLY, &rfc1149only))
									Con_Printf("LHNET_OpenSocket_Connectionless: warning: setsockopt(RFC1149_1149ONLY) returned error: %s\n", LHNETPRIVATE_StrError());
								if(setsockopt(lhnetsocket->inetsocket, SOL_RFC1149, RFC1149_ENABLED, &rfc1149enabled))
									Con_Printf("LHNET_OpenSocket_Connectionless: warning: setsockopt(RFC1149_ENABLED) returned error: %s\n", LHNETPRIVATE_StrError());
							}
#endif

#ifndef NOSUPPORTIPV6
							if (address->addresstype == LHNETADDRESSTYPE_INET6)
							{
								namelen = sizeof(localaddress->addr.in6);
								bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
								if (bindresult != -1)
								{
									if (getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen))
									{
										// If getsockname failed, we can assume the bound socket is useless.
										bindresult = -1;
									}
								}
							}
							else
#endif
							{
								namelen = sizeof(localaddress->addr.in);
								bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
								if (bindresult != -1)
								{
									if (getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen))
									{
										// If getsockname failed, we can assume the bound socket is useless.
										bindresult = -1;
									}
								}
							}
							if (bindresult != -1)
							{
								int i = 1;
								// enable broadcast on this socket
								setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
#ifdef IP_TOS
								{
									// enable DSCP for ToS support
									int tos = lhnet_default_dscp << 2;
									if (setsockopt(lhnetsocket->inetsocket, IPPROTO_IP, IP_TOS, (char *) &tos, sizeof(tos)))
									{
										// Error in setsockopt - fine, we'll simply set no TOS then.
									}
								}
#endif
								lhnetsocket->next = &lhnet_socketlist;
								lhnetsocket->prev = lhnetsocket->next->prev;
								lhnetsocket->next->prev = lhnetsocket;
								lhnetsocket->prev->next = lhnetsocket;
#ifdef WIN32
								if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
									Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
#endif
								return lhnetsocket;
							}
							else
								Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
						}
#ifdef IPV6_V6ONLY
						else
							Con_Printf("LHNET_OpenSocket_Connectionless: setsockopt(IPV6_V6ONLY) returned error: %s\n", LHNETPRIVATE_StrError());
#endif
					}
					else
						Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
					closesocket(lhnetsocket->inetsocket);
				}
				else
					Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
#ifdef WIN32
			}
			else
				Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
#endif
			break;
		default:
			break;
		}
		Z_Free(lhnetsocket);
	}
	return NULL;
}

void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
{
	if (lhnetsocket)
	{
		// unlink from socket list
		if (lhnetsocket->next == NULL)
			return; // invalid!
		lhnetsocket->next->prev = lhnetsocket->prev;
		lhnetsocket->prev->next = lhnetsocket->next;
		lhnetsocket->next = NULL;
		lhnetsocket->prev = NULL;

		// no special close code for loopback, just inet
		if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
		{
			closesocket(lhnetsocket->inetsocket);
		}
		Z_Free(lhnetsocket);
	}
}

lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
{
	if (sock)
		return &sock->address;
	else
		return NULL;
}

int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *vaddress)
{
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
	int value = 0;
	if (!lhnetsocket || !address || !content || maxcontentlength < 1)
		return -1;
	if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
	{
		time_t currenttime;
		lhnetpacket_t *p, *pnext;
		// scan for any old packets to timeout while searching for a packet
		// that is waiting to be delivered to this socket
		currenttime = time(NULL);
		for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
		{
			pnext = p->next;
			if (p->timeout < currenttime)
			{
				// unlink and free
				p->next->prev = p->prev;
				p->prev->next = p->next;
				Z_Free(p);
				continue;
			}
#ifndef STANDALONETEST
			if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
				continue;
#endif
			if (value == 0 && p->destinationport == lhnetsocket->address.port)
			{
				if (p->length <= maxcontentlength)
				{
					lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
					*address = *localaddress;
					address->port = p->sourceport;
					memcpy(content, p->data, p->length);
					value = p->length;
				}
				else
					value = -1;
				// unlink and free
				p->next->prev = p->prev;
				p->prev->next = p->next;
				Z_Free(p);
			}
		}
	}
	else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
	{
		SOCKLEN_T inetaddresslength;
		address->addresstype = LHNETADDRESSTYPE_NONE;
		inetaddresslength = sizeof(address->addr.in);
		value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, LHNET_RECVFROM_FLAGS, &address->addr.sock, &inetaddresslength);
		if (value > 0)
		{
			address->addresstype = LHNETADDRESSTYPE_INET4;
			address->port = ntohs(address->addr.in.sin_port);
			return value;
		}
		else if (value < 0)
		{
			int e = SOCKETERRNO;
			if (e == EWOULDBLOCK)
				return 0;
			switch (e)
			{
				case ECONNREFUSED:
					Con_Print("Connection refused\n");
					return 0;
			}
			Con_DPrintf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
		}
	}
#ifndef NOSUPPORTIPV6
	else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
	{
		SOCKLEN_T inetaddresslength;
		address->addresstype = LHNETADDRESSTYPE_NONE;
		inetaddresslength = sizeof(address->addr.in6);
		value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, LHNET_RECVFROM_FLAGS, &address->addr.sock, &inetaddresslength);
		if (value > 0)
		{
			address->addresstype = LHNETADDRESSTYPE_INET6;
			address->port = ntohs(address->addr.in6.sin6_port);
			return value;
		}
		else if (value == -1)
		{
			int e = SOCKETERRNO;
			if (e == EWOULDBLOCK)
				return 0;
			switch (e)
			{
				case ECONNREFUSED:
					Con_Print("Connection refused\n");
					return 0;
			}
			Con_DPrintf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
		}
	}
#endif
	return value;
}

int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *vaddress)
{
	lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
	int value = -1;
	if (!lhnetsocket || !address || !content || contentlength < 1)
		return -1;
	if (lhnetsocket->address.addresstype != address->addresstype)
		return -1;
	if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
	{
		lhnetpacket_t *p;
		p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
		p->data = (void *)(p + 1);
		memcpy(p->data, content, contentlength);
		p->length = contentlength;
		p->sourceport = lhnetsocket->address.port;
		p->destinationport = address->port;
		p->timeout = time(NULL) + 10;
		p->next = &lhnet_packetlist;
		p->prev = p->next->prev;
		p->next->prev = p;
		p->prev->next = p;
#ifndef STANDALONETEST
		p->sentdoubletime = realtime;
#endif
		value = contentlength;
	}
	else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
	{
		value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, LHNET_SENDTO_FLAGS, (struct sockaddr *)&address->addr.in, sizeof(struct sockaddr_in));
		if (value == -1)
		{
			if (SOCKETERRNO == EWOULDBLOCK)
				return 0;
			Con_DPrintf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
		}
	}
#ifndef NOSUPPORTIPV6
	else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
	{
		value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, 0, (struct sockaddr *)&address->addr.in6, sizeof(struct sockaddr_in6));
		if (value == -1)
		{
			if (SOCKETERRNO == EWOULDBLOCK)
				return 0;
			Con_DPrintf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
		}
	}
#endif
	return value;
}

#ifdef STANDALONETEST
int main(int argc, char **argv)
{
#if 1
	char *buffer = "test", buffer2[1024];
	int blen = strlen(buffer);
	int b2len = 1024;
	lhnetsocket_t *sock1;
	lhnetsocket_t *sock2;
	lhnetaddress_t myaddy1;
	lhnetaddress_t myaddy2;
	lhnetaddress_t myaddy3;
	lhnetaddress_t localhostaddy1;
	lhnetaddress_t localhostaddy2;
	int test1;
	int test2;

	printf("calling LHNET_Init\n");
	LHNET_Init();

	printf("calling LHNET_FromPort twice to create two local addresses\n");
	LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
	LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
	LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
	LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);

	printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
	sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
	sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);

	printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
	test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
	printf("sleeping briefly\n");
#ifdef WIN32
	Sleep (100);
#else
	usleep (100000);
#endif
	printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
	test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
	if (test2 > 0)
		Con_Printf("socket to socket test succeeded\n");
	else
		Con_Printf("socket to socket test failed\n");

#ifdef WIN32
	printf("press any key to exit\n");
	getchar();
#endif

	printf("calling LHNET_Shutdown\n");
	LHNET_Shutdown();
	printf("exiting\n");
	return 0;
#else
	lhnetsocket_t *sock[16], *sendsock;
	int i;
	int numsockets;
	int count;
	int length;
	int port;
	time_t oldtime;
	time_t newtime;
	char *sendmessage;
	int sendmessagelength;
	lhnetaddress_t destaddress;
	lhnetaddress_t receiveaddress;
	lhnetaddress_t sockaddress[16];
	char buffer[1536], addressstring[128], addressstring2[128];
	if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
	{
		printf("calling LHNET_Init()\n");
		LHNET_Init();

		numsockets = 0;
		LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
		LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
		LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);

		sendsock = NULL;
		sendmessage = NULL;
		sendmessagelength = 0;

		for (i = 0;i < numsockets;i++)
		{
			LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
			printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
			if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
			{
				LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
				printf("opened socket successfully (address \"%s\")\n", addressstring2);
			}
			else
			{
				printf("failed to open socket\n");
				if (i == 0)
				{
					LHNET_Shutdown();
					return -1;
				}
			}
		}
		count = 0;
		if (argc == 5)
		{
			count = atoi(argv[2]);
			if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
			{
				sendmessage = argv[4];
				sendmessagelength = strlen(sendmessage);
				sendsock = NULL;
				for (i = 0;i < numsockets;i++)
					if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
						sendsock = sock[i];
				if (sendsock == NULL)
				{
					printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
					argc = 2;
				}
			}
			else
			{
				printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
				argc = 2;
			}
		}
		printf("started, now listening for \"exit\" on the opened sockets\n");
		oldtime = time(NULL);
		for(;;)
		{
#ifdef WIN32
			Sleep(1);
#else
			usleep(1);
#endif
			for (i = 0;i < numsockets;i++)
			{
				if (sock[i])
				{
					length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
					if (length < 0)
						printf("localsock read error: length < 0");
					else if (length > 0 && length < (int)sizeof(buffer))
					{
						buffer[length] = 0;
						LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
						LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
						printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
						if (!strcmp(buffer, "exit"))
							break;
					}
				}
			}
			if (i < numsockets)
				break;
			if (argc == 5 && count > 0)
			{
				newtime = time(NULL);
				if (newtime != oldtime)
				{
					LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
					LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
					printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
					length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
					if (length == sendmessagelength)
						printf("sent successfully\n");
					else
						printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
					oldtime = newtime;
					count--;
					if (count <= 0)
						printf("Done sending, still listening for \"exit\"\n");
				}
			}
		}
		for (i = 0;i < numsockets;i++)
		{
			if (sock[i])
			{
				LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
				printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
				LHNET_CloseSocket(sock[i]);
			}
		}
		printf("calling LHNET_Shutdown()\n");
		LHNET_Shutdown();
		return 0;
	}
	printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
	return -1;
#endif
}
#endif