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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)
{
enum { max = 65000 };
FILE *etc_group;
gid_t desired;
/* Using _r function to avoid static buffers pulled in */
char buffer[256];
struct group grp;
struct group *result;
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 (!fgetgrent_r(etc_group, &grp, buffer, sizeof(buffer), &result)) {
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;
}
}
if (ENABLE_FEATURE_CLEAN_UP)
fclose(etc_group);
/* gid */
g->gr_gid++;
if (desired) {
g->gr_gid = desired;
}
/* 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);
if (ENABLE_FEATURE_CLEAN_UP)
fclose(file);
#if ENABLE_FEATURE_SHADOWPASSWDS
file = fopen_or_warn(bb_path_gshadow_file, "a");
if (file) {
fprintf(file, "%s:!::\n", group);
if (ENABLE_FEATURE_CLEAN_UP)
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);
int addgroup_main(int argc, char **argv)
{
char *group;
gid_t gid = 0;
/* check for min, max and missing args and exit on error */
opt_complementary = "-1:?2:?";
if (getopt32(argc, argv, "g:", &group)) {
gid = xatoul_range(group, 0, (gid_t)ULONG_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);
}
return addgroup(argv[0], gid, argv[1] ? argv[1] : "");
}
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