1 files changed, 107 insertions, 0 deletions
diff --git a/loginutils/addgroup.c b/loginutils/addgroup.c
new file mode 100644
index 000000000..0172e6041
--- /dev/null
+++ b/loginutils/addgroup.c
@@ -0,0 +1,107 @@
+/* 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 */
+	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);
+	}
+
+	/* werk */
+	return addgroup(argv[0], gid, (argv[1]) ? argv[1] : "");
+}