108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* addgroup - add users to /etc/passwd and /etc/shadow
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*
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* Copyright (C) 1999 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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*/
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#include "busybox.h"
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/* make sure gr_name isn't taken, make sure gid is kosher
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* return 1 on failure */
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static int group_study(struct group *g)
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{
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FILE *etc_group;
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gid_t desired;
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struct group *grp;
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const int max = 65000;
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etc_group = xfopen(bb_path_group_file, "r");
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/* make sure gr_name isn't taken, make sure gid is kosher */
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desired = g->gr_gid;
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while ((grp = fgetgrent(etc_group))) {
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if ((strcmp(grp->gr_name, g->gr_name)) == 0) {
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bb_error_msg_and_die("%s: group already in use", g->gr_name);
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}
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if ((desired) && grp->gr_gid == desired) {
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bb_error_msg_and_die("%d: gid already in use",
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desired);
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}
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if ((grp->gr_gid > g->gr_gid) && (grp->gr_gid < max)) {
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g->gr_gid = grp->gr_gid;
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}
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}
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fclose(etc_group);
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/* gid */
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if (desired) {
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g->gr_gid = desired;
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} else {
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g->gr_gid++;
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}
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/* return 1; */
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return 0;
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}
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/* append a new user to the passwd file */
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static int addgroup(char *group, gid_t gid, const char *user)
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{
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FILE *file;
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struct group gr;
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/* make sure gid and group haven't already been allocated */
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gr.gr_gid = gid;
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gr.gr_name = group;
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if (group_study(&gr))
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return 1;
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/* add entry to group */
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file = xfopen(bb_path_group_file, "a");
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/* group:passwd:gid:userlist */
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fprintf(file, "%s:%s:%d:%s\n", group, "x", gr.gr_gid, user);
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fclose(file);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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file = xfopen(bb_path_gshadow_file, "a");
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fprintf(file, "%s:!::\n", group);
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fclose(file);
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#endif
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/* return 1; */
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return 0;
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}
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/*
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* addgroup will take a login_name as its first parameter.
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*
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* gid
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*
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* can be customized via command-line parameters.
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* ________________________________________________________________________ */
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int addgroup_main(int argc, char **argv)
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{
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char *group;
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gid_t gid = 0;
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/* check for min, max and missing args and exit on error */
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opt_complementary = "-1:?2:?";
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if (getopt32(argc, argv, "g:", &group)) {
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gid = xatoul_range(group, 0, (gid_t)ULONG_MAX);
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}
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/* move past the commandline options */
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argv += optind;
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/* need to be root */
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if (geteuid()) {
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bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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}
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/* werk */
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return addgroup(argv[0], gid, (argv[1]) ? argv[1] : "");
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}
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