/*-
 * Copyright (C) 1996
 *      David L. Nugent.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT 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 DAVID L. NUGENT 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.
 *
 * $FreeBSD: src/usr.sbin/pw/grupd.c,v 1.10 2001/08/30 06:32:17 dd Exp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>

#include "pwupd.h"

static char * grpath = _PATH_PWD;

int
setgrdir(const char * dir)
{
        if (dir == NULL)
                return -1;
        else {
                char * d = malloc(strlen(dir)+1);
                if (d == NULL)
                        return -1;
                grpath = strcpy(d, dir);
        }
        return 0;
}

char *
getgrpath(const char * file)
{
        static char pathbuf[MAXPATHLEN];

        snprintf(pathbuf, sizeof pathbuf, "%s/%s", grpath, file);
        return pathbuf;
}

int
grdb(char *arg __unused, ...)
{
        /*
         * This is a stub for now, but maybe eventually be functional
         * if ever an indexed version of /etc/groups is implemented.
         */

        return 0;
}

int
fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
{
        int             i, l;

        /*
         * Since a group line is of arbitrary length,
         * we need to calculate up-front just how long
         * it will need to be...
         */
        /*  groupname              :   password                 :  gid  : */
        l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
        /* group members + comma separator */
        for (i = 0; grp->gr_mem[i] != NULL; i++) {
                l += strlen(grp->gr_mem[i]) + 1;
        }
        l += 2; /* For newline & NUL */
        if (extendline(buf, buflen, l) == -1)
                l = -1;
        else{
                /*
                 * Now we can safely format
                 */
                if (type == PWF_STANDARD)
                        l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
                else
                        l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);

                /*
                 * List members
                 */
                for (i = 0; grp->gr_mem[i] != NULL; i++) {
                        l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
                }

                (*buf)[l++] = '\n';
                (*buf)[l] = '\0';
        }
        return l;
}


int
fmtgrent(char **buf, int * buflen, struct group * grp)
{
        return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
}


static int
gr_update(struct group * grp, char const * group, int mode)
{
        int             l;
        char            pfx[64];
        int             grbuflen = 0;
        char           *grbuf = NULL;

        ENDGRENT();
        l = snprintf(pfx, sizeof pfx, "%s:", group);

        /*
         * Update the group file
         */
        if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
                l = -1;
        else {
                l = fileupdate(getgrpath(_GROUP), 0644, grbuf, pfx, l, mode);
                if (l == 0)
                        l = grdb(NULL);
        }
        if (grbuf != NULL)
                free(grbuf);
        return l;
}


int
addgrent(struct group * grp)
{
        return gr_update(grp, grp->gr_name, UPD_CREATE);
}

int
chggrent(char const * login, struct group * grp)
{
        return gr_update(grp, login, UPD_REPLACE);
}

int
delgrent(struct group * grp)
{
        return gr_update(NULL, grp->gr_name, UPD_DELETE);
}