/*

Copyright 1991, 1998  The Open Group
Copyright 2002 Sun Microsystems, Inc.  All rights reserved.

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of a copyright holder shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the copyright holder.

*/

/*
 * xdm - display manager daemon
 * Author: Keith Packard, MIT X Consortium
 *
 * netaddr.c - Interpretation of XdmcpNetaddr object.
 */

#include "dm.h"
#include "dm_socket.h"
#include "dm_error.h"

/* given an char *, returns the socket protocol family used,
   e.g., AF_INET */

int
NetaddrFamily( char *netaddrp )
{
#ifdef STREAMSCONN
	short family = *(short *)netaddrp;
	return family;
#else
	return ((struct sockaddr *)netaddrp)->sa_family;
#endif
}


/* given an char *, returns a pointer to the TCP/UDP port used
   and sets *lenp to the length of the address
   or 0 if not using TCP or UDP. */

char *
NetaddrPort( char *netaddrp, int *lenp )
{
#ifdef STREAMSCONN
	*lenp = 2;
	return netaddrp+2;
#else
	switch (NetaddrFamily( netaddrp ))
	{
	case AF_INET:
		*lenp = 2;
		return (char *)&(((struct sockaddr_in *)netaddrp)->sin_port);
#if defined(IPv6) && defined(AF_INET6)
	case AF_INET6:
		*lenp = 2;
		return (char *)&(((struct sockaddr_in6 *)netaddrp)->sin6_port);
#endif
	default:
		*lenp = 0;
		return NULL;
	}
#endif
}


/* given an char *, returns a pointer to the network address
   and sets *lenp to the length of the address */

char *
NetaddrAddress( char *netaddrp, int *lenp )
{
#ifdef STREAMSCONN
	*lenp = 4;
	return netaddrp+4;
#else
	switch (NetaddrFamily( netaddrp )) {
#ifdef UNIXCONN
	case AF_UNIX:
		*lenp = strlen( ((struct sockaddr_un *)netaddrp)->sun_path );
		return (char *)(((struct sockaddr_un *)netaddrp)->sun_path);
#endif
#ifdef TCPCONN
	case AF_INET:
		*lenp = sizeof(struct in_addr);
		return (char *)&(((struct sockaddr_in *)netaddrp)->sin_addr);
#if defined(IPv6) && defined(AF_INET6)
	case AF_INET6:
	{
		struct in6_addr *a = &(((struct sockaddr_in6 *)netaddrp)->sin6_addr);
		if (IN6_IS_ADDR_V4MAPPED( a )) {
			*lenp = sizeof(struct in_addr);
			return ((char *)&(a->s6_addr))+12;
		} else {
			*lenp = sizeof(struct in6_addr);
			return (char *)&(a->s6_addr);
		}
	}
#endif
#endif
#ifdef DNETCONN
	case AF_DECnet:
		*lenp = sizeof(struct dn_naddr);
		return (char *)&(((struct sockaddr_dn *)netaddrp)->sdn_add);
#endif
#ifdef AF_CHAOS
	case AF_CHAOS:
#endif
	default:
		*lenp = 0;
		return NULL;
	}
#endif /* STREAMSCONN else */
}


/* given an char *, sets *addr to the network address used and
   sets *len to the number of bytes in addr.
   Returns the X protocol family used, e.g., FamilyInternet */

int
ConvertAddr( char *saddr, int *len, char **addr )
{
	int retval;

	if (len == NULL)
		return -1;
	*addr = NetaddrAddress( saddr, len );
#ifdef STREAMSCONN
	/* kludge */
	if (NetaddrFamily( saddr ) == 2)
		retval = FamilyInternet;
#else
	switch (NetaddrFamily( saddr )) {
#ifdef AF_UNSPEC
	  case AF_UNSPEC:
		retval = FamilyLocal;
		break;
#endif
#ifdef AF_UNIX
	  case AF_UNIX:
		retval = FamilyLocal;
		break;
#endif
#ifdef TCPCONN
	  case AF_INET:
		retval = FamilyInternet;
		break;
#if defined(IPv6) && defined(AF_INET6)
	  case AF_INET6:
		if (*len == sizeof(struct in_addr))
			retval = FamilyInternet;
		else
			retval = FamilyInternet6;
		break;
#endif
#endif
#ifdef DNETCONN
	  case AF_DECnet:
		retval = FamilyDECnet;
		break;
#endif
#ifdef AF_CHAOS
	case AF_CHAOS:
		retval = FamilyChaos;
		break;
#endif
	  default:
		retval = -1;
		break;
	}
#endif /* STREAMSCONN else */
	Debug( "ConvertAddr returning %d for family %d\n", retval,
	       NetaddrFamily( saddr ) );
	return retval;
}

#ifdef XDMCP
int
addressEqual( char *a1, int len1, char *a2, int len2 )
{
	int partlen1, partlen2;
	char *part1, *part2;

	if (len1 != len2)
		return FALSE;
	if (NetaddrFamily( a1 ) != NetaddrFamily( a2 ))
		return FALSE;
	part1 = NetaddrPort( a1, &partlen1 );
	part2 = NetaddrPort( a2, &partlen2 );
	if (partlen1 != partlen2 || memcmp( part1, part2, partlen1 ) != 0)
		return FALSE;
	part1 = NetaddrAddress( a1, &partlen1 );
	part2 = NetaddrAddress( a2, &partlen2 );
	if (partlen1 != partlen2 || memcmp( part1, part2, partlen1 ) != 0)
		return FALSE;
	return TRUE;
}
#endif
