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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>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
*/
#include "busybox.h"
/* make sure gr_name isn't taken, make sure gid is kosher
* return 1 on failure */
static int group_study(struct group *g)
{
FILE *etc_group;
gid_t desired;
struct group *grp;
const int max = 65000;
etc_group = xfopen(bb_path_group_file, "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", g->gr_name);
}
if ((desired) && grp->gr_gid == desired) {
bb_error_msg_and_die("%d: gid already in use",
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(char *group, gid_t gid, const char *user)
{
FILE *file;
struct group gr;
/* make sure gid and group haven't already been allocated */
gr.gr_gid = gid;
gr.gr_name = group;
if (group_study(&gr))
return 1;
/* add entry to group */
file = xfopen(bb_path_group_file, "a");
/* group:passwd:gid:userlist */
fprintf(file, "%s:%s:%d:%s\n", group, "x", gr.gr_gid, user);
fclose(file);
#if ENABLE_FEATURE_SHADOWPASSWDS
file = xfopen(bb_path_gshadow_file, "a");
fprintf(file, "%s:!::\n", group);
fclose(file);
#endif
/* 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)
{
char *group;
gid_t gid = 0;
/* check for min, max and missing args and exit on error */
bb_opt_complementally = "-1:?2:?";
if (bb_getopt_ulflags(argc, argv, "g:", &group)) {
gid = bb_xgetlarg(group, 10, 0, LONG_MAX);
}
/* move past the commandline options */
argv += optind;
/* need to be root */
if(geteuid()) {
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
}
/* werk */
return addgroup(argv[0], gid, (argv[1]) ? argv[1] : "");
}
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