Bigger patch for (partial) tinylogin integration

- Made a new dir loginutils
- Moved all applets from pwd_grp to loginutils
- Added new applets su.c login.c to loginutils
- Made a new dir libpwdgrp
- Moved everything from pwd_grp/libpwd_grp there
- Added shadow.c to libpwdgrp
- Removed dir pwd_grp
- Added usage strings for login and su to usage.h
- Changed main Makefile to reflect the dir rearrangements
[Parts of this patch may overlap with my other two patches]

1 files changed, 168 insertions, 0 deletions

diff --git a/loginutils/addgroup.c b/loginutils/addgroup.c
new file mode 100644
index 000000000..e04a8d784
--- /dev/null
+++ b/loginutils/addgroup.c
@@ -0,0 +1,168 @@
+/* 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"
+
+#define GROUP_FILE      "/etc/group"
+#define SHADOW_FILE		"/etc/gshadow"
+
+
+/* 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 = 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) {
+			error_msg_and_die("%s: group already in use\n", g->gr_name);
+		}
+		if ((desired) && grp->gr_gid == desired) {
+			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)
+{
+	FILE *etc_group;
+
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+	FILE *etc_gshadow;
+	char *gshadow = SHADOW_FILE;
+#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 = xfopen(filename, "a");
+
+	fprintf(etc_group, entryfmt, group, default_passwd, gr.gr_gid, "");
+	fclose(etc_group);
+
+
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+	/* add entry to gshadow if necessary */
+	if (access(gshadow, F_OK|W_OK) == 0) {
+		etc_gshadow = xfopen(gshadow, "a");
+		fprintf(etc_gshadow, "%s:!::\n", group);
+		fclose(etc_gshadow);
+	}
+#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 opt;
+	char *group;
+	gid_t gid = 0;
+
+	/* get remaining args */
+	while ((opt = getopt (argc, argv, "g:")) != -1)
+		switch (opt) {
+			case 'g':
+				gid = strtol(optarg, NULL, 10);
+				break;
+			default:
+				show_usage();
+				break;
+		}
+
+	if (optind >= argc) {
+		show_usage();
+	} else {
+		group = argv[optind];
+	}
+
+	if (geteuid() != 0) {
+		error_msg_and_die
+			("Only root may add a group to the system.");
+	}
+
+	/* werk */
+	return addgroup(GROUP_FILE, group, gid);
+}
+
+/* $Id: addgroup.c,v 1.1 2002/06/04 20:45:05 sandman Exp $ */