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/* vi: set sw=4 ts=4: */
/*
* addgroup - add users to /etc/passwd and /etc/shadow
*
* Copyright (C) 1999 by Lineo, inc. and John Beppu
* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
*
* 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_.h"
#include "grp_.h"
/* structs __________________________ */
/* data _____________________________ */
/* defaults : should this be in an external file? */
static const 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;
etc_group = bb_xfopen(filename, "r");
/* 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) {
bb_error_msg_and_die("%s: group already in use\n", g->gr_name);
}
if ((desired) && grp->gr_gid == desired) {
bb_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, const char *user)
{
FILE *etc_group;
#ifdef CONFIG_FEATURE_SHADOWPASSWDS
FILE *etc_gshadow;
#endif
struct group gr;
/* group:passwd:gid:userlist */
static 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 = bb_xfopen(filename, "a");
fprintf(etc_group, entryfmt, group, default_passwd, gr.gr_gid, user);
fclose(etc_group);
#ifdef CONFIG_FEATURE_SHADOWPASSWDS
/* add entry to gshadow if necessary */
if (access(bb_path_gshadow_file, F_OK|W_OK) == 0) {
etc_gshadow = bb_xfopen(bb_path_gshadow_file, "a");
fprintf(etc_gshadow, "%s:!::\n", group);
fclose(etc_gshadow);
}
#endif
/* return 1; */
return 0;
}
#ifndef CONFIG_ADDUSER
static inline void if_i_am_not_root(void)
{
if (geteuid()) {
bb_error_msg_and_die( "Only root may add a user or group to the system.");
}
}
#else
extern void if_i_am_not_root(void);
#endif
/*
* 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)
{
char *group;
char *user;
gid_t gid = 0;
/* get remaining args */
if(bb_getopt_ulflags(argc, argv, "g:", &group)) {
gid = bb_xgetlarg(group, 10, 0, LONG_MAX);
}
if (optind < argc) {
group = argv[optind];
optind++;
} else {
bb_show_usage();
}
if (optind < argc) {
user = argv[optind];
} else {
user = "";
}
if_i_am_not_root();
/* werk */
return addgroup(bb_path_group_file, group, gid, user);
}
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