files/common/getpwnam.c

	getpwnam.c revision cb5caa98562cf06753163f558cbcfe30b8f4673a
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * files/getpwnam.c -- "files" backend for nsswitch "passwd" database
 */

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

#include <pwd.h>
#include <shadow.h>
#include <unistd.h>     /* for PF_PATH */
#include "files_common.h"
#include <strings.h>
#include <stdlib.h>

static uint_t
hash_pwname(nss_XbyY_args_t *argp, int keyhash, const char *line,
    int linelen)
{
    const char  *name;
    int     namelen, i;
    uint_t      hash = 0;

    if (keyhash) {
        name = argp->key.name;
        namelen = strlen(name);
    } else {
        name = line;
        namelen = 0;
        while (linelen-- && *line++ != ':')
            namelen++;
    }

    for (i = 0; i < namelen; i++)
        hash = hash * 15 + name[i];
    return (hash);
}

static uint_t
hash_pwuid(nss_XbyY_args_t *argp, int keyhash, const char *line,
    int linelen)
{
    uint_t      id;
    const char  *linep, *limit, *end;

    linep = line;
    limit = line + linelen;

    if (keyhash)
        return ((uint_t)argp->key.uid);

    /* skip username */
    while (linep < limit && *linep++ != ':');
    /* skip password */
    while (linep < limit && *linep++ != ':');
    if (linep == limit)
        return (UID_NOBODY);

    /* uid */
    end = linep;
    id = (uint_t)strtol(linep, (char **)&end, 10);

    /* empty uid */
    if (linep == end)
        return (UID_NOBODY);

    return (id);
}

static files_hash_func hash_pw[2] = { hash_pwname, hash_pwuid };

static files_hash_t hashinfo = {
    DEFAULTMUTEX,
    sizeof (struct passwd),
    NSS_BUFLEN_PASSWD,
    2,
    hash_pw
};

static int
check_pwname(nss_XbyY_args_t *argp, const char *line, int linelen)
{
    const char  *linep, *limit;
    const char *keyp = argp->key.name;

    linep = line;
    limit = line + linelen;

    /* +/- entries valid for compat source only */
    if (linelen == 0 || *line == '+' || *line == '-')
        return (0);
    while (*keyp && linep < limit && *keyp == *linep) {
        keyp++;
        linep++;
    }
    return (linep < limit && *keyp == '\0' && *linep == ':');
}

static nss_status_t
getbyname(be, a)
    files_backend_ptr_t be;
    void            *a;
{
    return (_nss_files_XY_hash(be, a, 0, &hashinfo, 0, check_pwname));
}

static int
check_pwuid(nss_XbyY_args_t *argp, const char *line, int linelen)
{
    const char  *linep, *limit, *end;
    uid_t       pw_uid;

    linep = line;
    limit = line + linelen;

    /* +/- entries valid for compat source only */
    if (linelen == 0 || *line == '+' || *line == '-')
        return (0);

    /* skip username */
    while (linep < limit && *linep++ != ':');
    /* skip password */
    while (linep < limit && *linep++ != ':');
    if (linep == limit)
        return (0);

    /* uid */
    end = linep;
    pw_uid = (uid_t)strtol(linep, (char **)&end, 10);

    /* empty uid is not valid */
    if (linep == end)
        return (0);

    return (pw_uid == argp->key.uid);
}

static nss_status_t
getbyuid(be, a)
    files_backend_ptr_t be;
    void            *a;
{
    return (_nss_files_XY_hash(be, a, 0, &hashinfo, 1, check_pwuid));
}

static files_backend_op_t passwd_ops[] = {
    _nss_files_destr,
    _nss_files_endent,
    _nss_files_setent,
    _nss_files_getent_rigid,
    getbyname,
    getbyuid
};

/*ARGSUSED*/
nss_backend_t *
_nss_files_passwd_constr(dummy1, dummy2, dummy3)
    const char  *dummy1, *dummy2, *dummy3;
{
    return (_nss_files_constr(passwd_ops,
                sizeof (passwd_ops) / sizeof (passwd_ops[0]),
                PF_PATH,
                NSS_LINELEN_PASSWD,
                &hashinfo));
}