/*      $NetBSD: pw_scan.c,v 1.23 2012/03/13 21:13:36 christos Exp $    */

/*
 * Copyright (c) 1987, 1993, 1994, 1995
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#include "compat_pwd.h"

#else
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: pw_scan.c,v 1.23 2012/03/13 21:13:36 christos Exp $");
#endif /* LIBC_SCCS and not lint */

#if defined(_LIBC)
#include "namespace.h"
#endif
#include <sys/types.h>

#include <assert.h>
#include <err.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#ifdef _LIBC
#include "pw_private.h"
#endif
#endif /* ! HAVE_NBTOOL_CONFIG_H */

static int
gettime(time_t *res, const char *p, int *flags, int dowarn, int flag)
{
        long long l;
        char *ep;
        const char *vp;

        if (*p == '\0') {
                *flags |= flag;
                *res = 0;
                return 1;
        }
        l = strtoll(p, &ep, 0);
        if (p == ep || *ep != '\0') {
                vp = "Invalid number";
                goto done;
        }
        if (errno == ERANGE && (l == LLONG_MAX || l == LLONG_MIN)) {
                vp = strerror(errno);
                goto done;
        }
        _DIAGASSERT(__type_fit(time_t, l));
        *res = (time_t)l;
        return 1;
done:
        if (dowarn) {
                warnx("%s `%s' for %s time", vp, p,
                    flag == _PASSWORD_NOEXP ? "expiration" : "change");
        }
        return 0;

}

static int
getid(unsigned long *res, const char *p, int *flags, int dowarn, int flag)
{
        unsigned long ul;
        char *ep;

        if (*p == '\0') {
                *flags |= flag;
                *res = 0;
                return 1;
        }
        ul = strtoul(p, &ep, 0);
        if (p == ep || *ep != '\0') {
                ep = __UNCONST("Invalid number");
                goto done;
        }
        if (errno == ERANGE && ul == ULONG_MAX) {
                ep = strerror(errno);
                goto done;
        }
        if (ul > *res) {
                ep = strerror(ERANGE);
                goto done;
        }

        *res = ul;
        return 1;
done:
        if (dowarn)
                warnx("%s %s `%s'", ep, 
                    flag == _PASSWORD_NOUID ? "uid" : "gid", p);
        return 0;

}

int
#ifdef _LIBC
__pw_scan(char *bp, struct passwd *pw, int *flags)
#else
pw_scan( char *bp, struct passwd *pw, int *flags)
#endif
{
        unsigned long id;
        time_t ti;
        int root, inflags;
        int dowarn;
        const char *p, *sh;

        _DIAGASSERT(bp != NULL);
        _DIAGASSERT(pw != NULL);

        if (flags) {
                inflags = *flags;
                *flags = 0;
        } else {
                inflags = 0;
                flags = &inflags;
        }
        dowarn = !(inflags & _PASSWORD_NOWARN);

        if (!(pw->pw_name = strsep(&bp, ":")))          /* login */
                goto fmt;
        if (strlen(pw->pw_name) > (LOGIN_NAME_MAX - 1)) {
                if (dowarn)
                        warnx("username too long, `%s' > %d", pw->pw_name,
                            LOGIN_NAME_MAX - 1);
                return 0;
        }

        root = !strcmp(pw->pw_name, "root");

        if (!(pw->pw_passwd = strsep(&bp, ":")))        /* passwd */
                goto fmt;

        if (!(p = strsep(&bp, ":")))                    /* uid */
                goto fmt;

        id = UID_MAX;
        if (!getid(&id, p, flags, dowarn, _PASSWORD_NOUID))
                return 0;

        if (root && id) {
                if (dowarn)
                        warnx("root uid should be 0");
                return 0;
        }

        pw->pw_uid = (uid_t)id;

        if (!(p = strsep(&bp, ":")))                    /* gid */
                goto fmt;

        id = GID_MAX;
        if (!getid(&id, p, flags, dowarn, _PASSWORD_NOGID))
                return 0;

        pw->pw_gid = (gid_t)id;

        if (inflags & _PASSWORD_OLDFMT) {
                pw->pw_class = __UNCONST("");
                pw->pw_change = 0;
                pw->pw_expire = 0;
                *flags |= (_PASSWORD_NOCHG | _PASSWORD_NOEXP);
        } else {
                pw->pw_class = strsep(&bp, ":");        /* class */
                if (!(p = strsep(&bp, ":")))            /* change */
                        goto fmt;
                if (!gettime(&ti, p, flags, dowarn, _PASSWORD_NOCHG))
                        return 0;
                pw->pw_change = ti;

                if (!(p = strsep(&bp, ":")))            /* expire */
                        goto fmt;
                if (!gettime(&ti, p, flags, dowarn, _PASSWORD_NOEXP))
                        return 0;
                pw->pw_expire = ti;
        }

        pw->pw_gecos = strsep(&bp, ":");                /* gecos */
        pw->pw_dir = strsep(&bp, ":");                  /* directory */
        if (!(pw->pw_shell = strsep(&bp, ":")))         /* shell */
                goto fmt;

#if ! HAVE_NBTOOL_CONFIG_H
        p = pw->pw_shell;
        if (root && *p)                                 /* empty == /bin/sh */
                for (setusershell();;) {
                        if (!(sh = getusershell())) {
                                if (dowarn)
                                        warnx("warning, unknown root shell");
                                break;
                        }
                        if (!strcmp(p, sh))
                                break;  
                }
#endif

        if ((p = strsep(&bp, ":")) != NULL) {                   /* too many */
fmt:            
                if (dowarn)
                        warnx("corrupted entry");
                return 0;
        }

        return 1;
}