libsldap/common/ns_getalias.c

	ns_getalias.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1999-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdlib.h>
#include <libintl.h>
#include <stdio.h>
#include <errno.h>
#include <strings.h>
#include "ns_sldap.h"
#include "ns_internal.h"

/*
 * getldaplaliasbyname() retrieves the aliases information from the LDAP server.
 * This is requires that the LDAP naming information (ie. LDAP_CLIENT_CACHE
 * file) is configured properly on the client machine.
 *
 * Return value:
 *      0 = success;
 *      1 = alias not found;
 *      -1 = other failure.  Contents in answer are undefined.
 */

#define ALIAS_FILTER     "(&(objectclass=mailgroup)(|(cn=%s)(mail=%s)))"
#define ALIAS_FILTER_SSD "(&(%%s)(|(cn=%s)(mail=%s)))"
#define MAIL_CN     "cn"
#define MAIL_ATTRIBUTE  "mail"
#define MAIL_MEMBER "mgrpRFC822MailMember"

/*
 * This is a generic filter call back function for
 * merging the filter from service search descriptor with
 * an existing search filter. This routine expects userdata
 * contain a format string with a single %s in it, and will
 * use the format string with sprintf() to insert the SSD filter.
 *
 * This routine is passed to the __ns_ldap_list() API as the
 * filter call back together with filter and userdata. For example,
 * "(&(objectclass=mailgroup)(|(cn=abc)(mail=abc)))" as filter
 * and "(&(%s)(|(cn=abc)(mail=abc)))" as userdata.
 * This routine will then be called by __ns_ldap_list() to output
 * "(&(dept=sds)(|(cn=abc)(mail=abc)))" as the real search
 * filter, if the input SSD contains a filter "dpet=sds".
 */
int
__s_api_merge_SSD_filter(const ns_ldap_search_desc_t *desc,
            char **realfilter,
            const void *userdata)
{
    int len;

    /* sanity check */
    if (realfilter == NULL)
        return (NS_LDAP_INVALID_PARAM);
    *realfilter = NULL;

    if (desc == NULL || desc->filter == NULL ||
            userdata == NULL)
        return (NS_LDAP_INVALID_PARAM);

    len = strlen(userdata) + strlen(desc->filter) + 1;

    *realfilter = (char *)malloc(len);
    if (*realfilter == NULL)
        return (NS_LDAP_MEMORY);

    (void) sprintf(*realfilter, (char *)userdata,
            desc->filter);

    return (NS_LDAP_SUCCESS);
}
int
__getldapaliasbyname(char *alias, char *answer, size_t ans_len)
{
    char        *service = "aliases";
    char        filter[BUFSIZE];
    char        userdata[BUFSIZE];
    char        *attribute[2];
    ns_ldap_result_t    *result = NULL;
    ns_ldap_error_t *errorp = NULL;
    int     rc, i, j, len, comma;
    ns_ldap_entry_t *entry = NULL;
    char        **attr_value = NULL;

    if (!alias || !*alias || !answer || ans_len == 0) {
        errno = EINVAL;
        return (-1);
    }

    answer[0] = '\0';

    /* get the aliases */
    if (snprintf(filter, sizeof (filter), ALIAS_FILTER, alias, alias) < 0) {
        errno = EINVAL;
        return (-1);
    }

    /* get the userdata for __ns_ldap_list filter call back */
    if (snprintf(userdata, sizeof (userdata), ALIAS_FILTER_SSD,
        alias, alias) < 0) {
        errno = EINVAL;
        return (-1);
    }

    attribute[0] = MAIL_MEMBER;
    attribute[1] = NULL;

    /* should we do hardlookup */
    rc = __ns_ldap_list(service, (const char *)filter,
        __s_api_merge_SSD_filter,
        (const char **)attribute, NULL, 0, &result,
        &errorp, NULL, userdata);

    if (rc == NS_LDAP_NOTFOUND) {
        errno = ENOENT;
        return (1);
    } else if (rc != NS_LDAP_SUCCESS) {
#ifdef DEBUG
        char *p;
        (void) __ns_ldap_err2str(rc, &p);
        if (errorp) {
            if (errorp->message)
                (void) fprintf(stderr, "%s (%s)\n", p,
                    errorp->message);
        } else
            (void) fprintf(stderr, "%s\n", p);
#endif /* DEBUG */
        (void) __ns_ldap_freeError(&errorp);
        return (-1);
    }

    /* build the return value */
    answer[0] = '\0';
    len = 0;
    comma = 0;
    entry = result->entry;
    for (i = 0; i < result->entries_count; i++) {
        attr_value = __ns_ldap_getAttr(entry, MAIL_MEMBER);
        if (attr_value == NULL) {
            errno = ENOENT;
            return (-1);
        }
        for (j = 0; attr_value[j]; j++) {
            char    *tmp, *newhead;

            tmp = attr_value[j];
            while (*tmp == ' ' || *tmp == '\t' && *tmp != '\0')
                tmp++;
            newhead = tmp;
            while (*tmp != '\0') tmp++;
            while (*tmp == ' ' || *tmp == '\t' || *tmp == '\0' &&
                tmp != newhead) {
                *tmp-- = '\0';
            }
            len = len + comma + strlen(newhead);
            if ((len + 1) > ans_len) {
                (void) __ns_ldap_freeResult(&result);
                errno = EOVERFLOW;
                return (-1);
            }
            if (comma)
                (void) strcat(answer, ",");
            else
                comma = 1;
            (void) strcat(answer, newhead);
        }
    }

    (void) __ns_ldap_freeResult(&result);
    errno = 0;
    return (0);
}