hush/addgroup.c
Eric Andersen f349e978c4 Initial merge of all tinylogin applets that do not require crypt.
There is some optimization that can be done to better use libbb in
these applets.  There is also redundancy between stty and getty which
could be eliminated.
 -Erik
2001-08-21 16:18:59 +00:00

179 lines
4.1 KiB
C

/* vi: set sw=4 ts=4: */
/*
* addgroup - add users to /etc/passwd and /etc/shadow
*
*
* Copyright (C) 1999 by Lineo, inc.
* Written by John Beppu <beppu@lineo.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "busybox.h"
#include "pwd_grp/pwd.h"
#include "pwd_grp/grp.h"
#define GROUP_FILE "/etc/group"
#define SHADOW_FILE "/etc/gshadow"
/* structs __________________________ */
/* data _____________________________ */
/* defaults : should this be in an external file? */
static char *default_passwd = "x";
/* make sure gr_name isn't taken, make sure gid is kosher
* return 1 on failure */
static int group_study(const char *filename, struct group *g)
{
FILE *etc_group;
gid_t desired;
struct group *grp;
const int max = 65000;
/* FIXME : make an fopen_wrapper */
etc_group = fopen(filename, "r");
if (!etc_group) {
perror_msg_and_die("%s", filename);
}
/* make sure gr_name isn't taken, make sure gid is kosher */
desired = g->gr_gid;
while ((grp = fgetgrent(etc_group))) {
if ((strcmp(grp->gr_name, g->gr_name)) == 0) {
error_msg_and_die("%s: group already in use\n", g->gr_name);
}
if ((desired) && grp->gr_gid == desired) {
error_msg_and_die("%d: gid has already been allocated\n",
desired);
}
if ((grp->gr_gid > g->gr_gid) && (grp->gr_gid < max)) {
g->gr_gid = grp->gr_gid;
}
}
fclose(etc_group);
/* gid */
if (desired) {
g->gr_gid = desired;
} else {
g->gr_gid++;
}
/* return 1; */
return 0;
}
/* append a new user to the passwd file */
static int addgroup(const char *filename, char *group, gid_t gid)
{
FILE *etc_group;
FILE *etc_gshadow;
char *gshadow = SHADOW_FILE;
struct group gr;
/* group:passwd:gid:userlist */
const char *entryfmt = "%s:%s:%d:%s\n";
/* make sure gid and group haven't already been allocated */
gr.gr_gid = gid;
gr.gr_name = group;
if (group_study(filename, &gr))
return 1;
/* add entry to group */
etc_group = fopen(filename, "a");
if (!etc_group) {
perror_msg_and_die("%s", filename);
}
fprintf(etc_group, entryfmt, group, default_passwd, gr.gr_gid, "");
fclose(etc_group);
/* add entry to gshadow if necessary */
if (access(gshadow, F_OK|W_OK) == 0) {
etc_gshadow = xfopen(gshadow, "a");
fprintf(etc_gshadow, "%s:!::\n", group);
fclose(etc_gshadow);
}
/* return 1; */
return 0;
}
/*
* addgroup will take a login_name as its first parameter.
*
* gid
*
* can be customized via command-line parameters.
* ________________________________________________________________________ */
int addgroup_main(int argc, char **argv)
{
int i;
char opt;
char *group;
gid_t gid = 0;
/* get remaining args */
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
opt = argv[i][1];
switch (opt) {
case 'h':
show_usage();
break;
case 'g':
gid = strtol(argv[++i], NULL, 10);
break;
default:
error_msg_and_die("addgroup: invalid option -- %c\n", opt);
}
} else {
break;
}
}
if (i >= argc) {
show_usage();
} else {
group = argv[i];
}
if (geteuid() != 0) {
error_msg_and_die
("addgroup: Only root may add a group to the system.\n");
}
/* werk */
return addgroup(GROUP_FILE, group, gid);
}
/* $Id: addgroup.c,v 1.1 2001/08/21 16:18:59 andersen Exp $ */