netname.c

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/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 
/*
 * 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 <wintirpc.h>
//#include <sys/param.h>
#include <rpc/rpc.h>
#include "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];
{
#ifdef _WIN32
    /* I don't understand what these underlying routines are accomplishing??? */
    return 1;
#else
    uid_t uid;
 
    uid = geteuid();
    if (uid == 0) {
        return (host2netname(name, (char *) NULL, (char *) NULL));
    } else {
        return (user2netname(name, uid, (char *) NULL));
    }
#endif
}
 
#ifndef _WIN32
/*
 * Convert unix cred to network-name
 */
int
user2netname(netname, uid, domain)
    char netname[MAXNETNAMELEN + 1];
    const uid_t uid;
    const 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];
    const char *host;
    const 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);
}
#endif