NetAdr.cpp #1

//========= Copyright  1996-2005, Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
// NetAdr.cpp: implementation of the CNetAdr class.
//
//=============================================================================//

#ifdef _WIN32
#include <windows.h>
#endif

#ifdef _XBOX
#include "xbox/xbox_platform.h"
#include "xbox/xbox_win32stubs.h"
#endif
#include "tier0/dbg.h"
#include "netadr.h"
#include "vstdlib/strtools.h"

#if defined(_WIN32) && !defined(_XBOX)
#define WIN32_LEAN_AND_MEAN
#include <winsock.h>
typedef int socklen_t;
#elif !defined(_XBOX)
#include <netinet/in.h> // ntohs()
#include <netdb.h>	// gethostbyname()
#include <sys/socket.h>	// getsockname()
#endif

// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

bool netadr_t::CompareAdr (const netadr_t &a, bool onlyBase) const
{
	if ( a.type != type )
		return false;

	if ( type == NA_LOOPBACK )
		return true;

	if ( type == NA_BROADCAST )
		return true;

	if ( type == NA_IP )
	{
		if ( !onlyBase && (port != a.port) )
			return false;

		if ( a.ip[0] == ip[0] && a.ip[1] == ip[1] && a.ip[2] == ip[2] && a.ip[3] == ip[3] )
			return true;
	}

	return false;
}

bool netadr_t::CompareClassBAdr (const netadr_t &a) const
{
	if ( a.type != type )
		return false;

	if ( type == NA_LOOPBACK )
		return true;

	if ( type == NA_IP )
	{
		if (a.ip[0] == ip[0] && a.ip[1] == ip[1] )
			return true;
	}

	return false;
}

// reserved addresses are not routeable, so they can all be used in a LAN game
bool netadr_t::IsReservedAdr () const
{
	if ( type == NA_LOOPBACK )
		return true;

	if ( type == NA_IP )
	{
		if ( (ip[0] == 10) ||									// 10.x.x.x is reserved
			 (ip[0] == 127) ||									// 127.x.x.x 
			 (ip[0] == 172 && ip[1] >= 16 && ip[1] <= 31) ||	// 172.16.x.x  - 172.31.x.x 
			 (ip[0] == 192 && ip[1] >= 168) ) 					// 192.168.x.x
			return true;
	}
	return false;
}

const char * netadr_t::ToString(bool baseOnly) const
{
	static	char	s[64];

	Q_strncpy (s, "unknown", sizeof( s ) );

	if (type == NA_LOOPBACK)
	{
		Q_strncpy (s, "loopback", sizeof( s ) );
	}
	else if (type == NA_BROADCAST)
	{
		Q_strncpy (s, "broadcast", sizeof( s ) );
	}
	else if (type == NA_IP)
	{
		if ( baseOnly)
		{
			Q_snprintf (s, sizeof( s ), "%i.%i.%i.%i", ip[0], ip[1], ip[2], ip[3]);
		}
		else
		{
#ifndef _XBOX
			Q_snprintf (s, sizeof( s ), "%i.%i.%i.%i:%i", ip[0], ip[1], ip[2], ip[3], ntohs(port));
#else
			Q_snprintf (s, sizeof( s ), "%i.%i.%i.%i:%i", ip[0], ip[1], ip[2], ip[3], port);
#endif
		}
	}

	return s;
}

bool netadr_t::IsLocalhost() const
{
	// are we 127.0.0.1 ?
	return (ip[0] == 127) && (ip[1] == 0) && (ip[2] == 0) && (ip[3] == 1);
}

bool netadr_t::IsLoopback() const
{
	// are we useding engine loopback buffers
	return type == NA_LOOPBACK;
}

void netadr_t::Clear()
{
	ip[0] = ip[1] = ip[2] = ip[3] = 0;
	port = 0;
	type = NA_NULL;
}

void netadr_t::SetIP(uint8 b1, uint8 b2, uint8 b3, uint8 b4)
{
	ip[0] = b1;
	ip[1] = b2;
	ip[2] = b3;
	ip[3] = b4;
}

void netadr_t::SetIP(uint unIP)
{
	*((uint*)ip) = BigLong( unIP );
}

void netadr_t::SetType(netadrtype_t newtype)
{
	type = newtype;
}

netadrtype_t netadr_t::GetType() const
{
	return type;
}

unsigned short netadr_t::GetPort() const
{
	return BigShort( port );
}

unsigned int netadr_t::GetIP() const
{
	return *(unsigned int *)&ip;;
}

void netadr_t::ToSockadr (struct sockaddr * s) const
{
	Q_memset ( s, 0, sizeof(struct sockaddr));

	if (type == NA_BROADCAST)
	{
		((struct sockaddr_in*)s)->sin_family = AF_INET;
		((struct sockaddr_in*)s)->sin_port = port;
		((struct sockaddr_in*)s)->sin_addr.s_addr = INADDR_BROADCAST;
	}
	else if (type == NA_IP)
	{
		((struct sockaddr_in*)s)->sin_family = AF_INET;
		((struct sockaddr_in*)s)->sin_addr.s_addr = *(int *)&ip;
		((struct sockaddr_in*)s)->sin_port = port;
	}
	else if (type == NA_LOOPBACK )
	{
		((struct sockaddr_in*)s)->sin_family = AF_INET;
		((struct sockaddr_in*)s)->sin_port = port;
		((struct sockaddr_in*)s)->sin_addr.s_addr = INADDR_LOOPBACK ;
	}
}

bool netadr_t::SetFromSockadr(const struct sockaddr * s)
{
	if (s->sa_family == AF_INET)
	{
		type = NA_IP;
		*(int *)&ip = ((struct sockaddr_in *)s)->sin_addr.s_addr;
		port = ((struct sockaddr_in *)s)->sin_port;
		return true;
	}
	else
	{
		Clear();
		return false;
	}
}

bool netadr_t::IsValid() const
{
	return ( (port !=0 ) && (type != NA_NULL) &&
			 ( ip[0] != 0 || ip[1] != 0 || ip[2] != 0 || ip[3] != 0 ) );
}

#ifdef _WIN32
#undef SetPort	// get around stupid WINSPOOL.H macro
#endif

void netadr_t::SetPort(unsigned short newport)
{
	port = BigShort( newport );
}

void netadr_t::SetFromString( const char *pch, bool bUseDNS )
{
	Clear();
	type = NA_IP;

	Assert( pch );		// invalid to call this with NULL pointer; fix your code bug!
	if ( !pch )			// but let's not crash
		return;


	if ( pch[0] >= '0' && pch[0] <= '9' && strchr( pch, '.' ) )
	{
		int n1, n2, n3, n4, n5;
		int nRes = sscanf( pch, "%d.%d.%d.%d:%d", &n1, &n2, &n3, &n4, &n5 );
		if ( nRes >= 4 )
		{
			SetIP( n1, n2, n3, n4 );
		}

		if ( nRes == 5 )
		{
			SetPort( ( uint16 ) n5 );
		}
	}
	else if ( bUseDNS )
	{
		char szHostName[ 256 ];
		Q_strncpy( szHostName, pch, sizeof(szHostName) );
		char *pchColon = strchr( szHostName, ':' );
		if ( pchColon )
		{
			*pchColon = 0;
		}
		
		// DNS it
		struct hostent *h = gethostbyname( szHostName );
		if ( !h )
			return;

		SetIP( ntohl( *(int *)h->h_addr_list[0]  ) );

		if ( pchColon )
		{
			SetPort( atoi( ++pchColon ) );
		}
	}
}

bool netadr_t::operator<(const netadr_t &netadr) const
{
	if ( *((uint *)netadr.ip) < *((uint *)ip) )
		return true;
	else if ( *((uint *)netadr.ip) > *((uint *)ip) )
		return false;
	return ( netadr.port < port );
}


void netadr_t::SetFromSocket( int hSocket )
{	
	Clear();
	type = NA_IP;

	struct sockaddr address;
	int namelen = sizeof(address);
	if ( getsockname( hSocket, (struct sockaddr *)&address, (int *)&namelen) == 0 )
	{
		SetFromSockadr( &address );
	}
}