/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user or with the express written consent of
 * Sun Microsystems, Inc.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 *
 * $FreeBSD: src/lib/libc/rpc/netname.c,v 1.2.6.1 2000/08/23 00:05:29 jhb Exp $
 * $DragonFly: src/lib/libcr/rpc/Attic/netname.c,v 1.2 2003/06/17 04:26:45 dillon Exp $
 *
 * @(#)netname.c 1.8 91/03/11 Copyr 1986 Sun Micro
 */

/*
 * netname utility routines
 * convert from unix names to network names and vice-versa
 * This module is operating system dependent!
 * What we define here will work with any unix system that has adopted
 * the sun NIS domain architecture.
 */

#include <sys/param.h>
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#ifdef YP
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#endif
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 256
#endif
#ifndef NGROUPS
#define NGROUPS 16
#endif

#define TYPE_BIT(type)  (sizeof (type) * CHAR_BIT)

#define TYPE_SIGNED(type) (((type) -1) < 0)

/*
** 302 / 1000 is log10(2.0) rounded up.
** Subtract one for the sign bit if the type is signed;
** add one for integer division truncation;
** add one more for a minus sign if the type is signed.
*/
#define INT_STRLEN_MAXIMUM(type) \
    ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type))

static char *OPSYS = "unix";

/*
 * Figure out my fully qualified network name
 */
int
getnetname(name)
	char name[MAXNETNAMELEN+1];
{
	uid_t uid;

	uid = geteuid();
	if (uid == 0) {
		return (host2netname(name, (char *) NULL, (char *) NULL));
	} else {
		return (user2netname(name, uid, (char *) NULL));
	}
}


/*
 * Convert unix cred to network-name
 */
int
user2netname(netname, uid, domain)
	char netname[MAXNETNAMELEN + 1];
	uid_t uid;
	char *domain;
{
	char *dfltdom;

	if (domain == NULL) {
		if (_rpc_get_default_domain(&dfltdom) != 0) {
			return (0);
		}
		domain = dfltdom;
	}
	if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
		return (0);
	}
	(void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain);	
	return (1);
}


/*
 * Convert host to network-name
 */
int
host2netname(netname, host, domain)
	char netname[MAXNETNAMELEN + 1];
	char *host;
	char *domain;
{
	char *dfltdom;
	char hostname[MAXHOSTNAMELEN+1];

	if (domain == NULL) {
		if (_rpc_get_default_domain(&dfltdom) != 0) {
			return (0);
		}
		domain = dfltdom;
	}
	if (host == NULL) {
		(void) gethostname(hostname, sizeof(hostname));
		host = hostname;
	}
	if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
		return (0);
	} 
	(void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain);
	return (1);
}