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/* This file is part of the Project Athena Zephyr Notification System.
 * It contains source for the ZGetSender.c function.
 *
 *	Created by:	Robert French
 *
 *	Copyright (c) 1987, 1991 by the Massachusetts Institute of Technology.
 *	For copying and distribution information, see the file
 *	"mit-copyright.h".
 */

#include "internal.h"

#ifndef WIN32
#include <pwd.h>
#endif

char *ZGetSender()
{
	struct passwd *pw;
#ifdef ZEPHYR_USES_KERBEROS
	char pname[ANAME_SZ];
	char pinst[INST_SZ];
	char prealm[REALM_SZ];
	static char sender[ANAME_SZ+INST_SZ+REALM_SZ+3] = "";
	long int kerror;
#else
	static char sender[128] = "";
#endif

#ifdef WIN32
	unsigned long sender_size = sizeof(sender) - 1;
#endif

#ifdef ZEPHYR_USES_KERBEROS
	if ((kerror = krb_get_tf_fullname((char *)TKT_FILE, pname, pinst, prealm)) == KSUCCESS)
	{
		sprintf(sender, "%s%s%s@%s", pname, (pinst[0] ? "." : ""), pinst, prealm);
		return sender;
	}
#endif

#ifdef WIN32
	GetUserName(sender, &sender_size);
#else
	/* XXX a uid_t is a u_short (now),  but getpwuid
	 * wants an int. AARGH! */
	pw = getpwuid((int) getuid());
	if (!pw)
		return ("unknown");
	sprintf(sender, "%s@%s", pw->pw_name, __Zephyr_realm);
#endif
	return sender;
}