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/usr/include/freeradius/udpfromto.h is in libfreeradius-dev 2.1.12+dfsg-1.2ubuntu8.

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#ifndef UDPFROMTO_H
#define UDPFROMTO_H
/*
 * Version:	$Id$
 *
 */

#include <freeradius/ident.h>
RCSIDH(udpfromtoh, "$Id$")

#include <freeradius/autoconf.h>
#include <freeradius/libradius.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifdef WITH_UDPFROMTO
int udpfromto_init(int s);
int recvfromto(int s, void *buf, size_t len, int flags,
	       struct sockaddr *from, socklen_t *fromlen,
	       struct sockaddr *to, socklen_t *tolen);
int sendfromto(int s, void *buf, size_t len, int flags,
	       struct sockaddr *from, socklen_t fromlen,
	       struct sockaddr *to, socklen_t tolen);
#endif

#ifdef __cplusplus
}
#endif

#endif