From b6aa1c857c9cf4c2d54681875761fa5107433771 Mon Sep 17 00:00:00 2001
From: Roy Marples <roy@marples.name>
Date: Wed, 19 Sep 2007 16:27:37 +0000
Subject: Added the checkown applet based on the work by Renato Caldas, #192682
 checkdir ensures that the specified files (or directories) are owned by the
 current user/group or as specified on the command line. You can optionally
 check permissions too.

---
 src/checkown.c | 179 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)
 create mode 100644 src/checkown.c

(limited to 'src/checkown.c')

diff --git a/src/checkown.c b/src/checkown.c
new file mode 100644
index 00000000..5326321a
--- /dev/null
+++ b/src/checkown.c
@@ -0,0 +1,179 @@
+/*
+   checkown.c
+   Checks for the existance of a directory and creates it
+   if necessary. It can also correct its ownership.
+
+   Copyright 2007 Gentoo Foundation
+   */
+
+#define APPLET "checkown"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <getopt.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "builtins.h"
+#include "einfo.h"
+
+static char *applet = NULL;
+
+static int do_check (char *path, uid_t uid, gid_t gid, mode_t mode)
+{
+	struct stat dirstat;
+
+	memset (&dirstat, 0, sizeof (dirstat));
+
+	if (stat (path, &dirstat)) {
+		einfo ("%s: creating directory", path);
+		if (! mode)
+			mode = S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH;
+		if (mkdir (path, mode)) {
+			eerror ("%s: mkdir: %s", applet, strerror (errno));
+			return (-1);
+		}
+	} else if (mode && (dirstat.st_mode & 0777) != mode) {
+		einfo ("%s: correcting mode", applet);
+		if (chmod (path, mode)) {
+			eerror ("%s: chmod: %s", applet, strerror (errno));
+			return (-1);
+		}
+	}
+
+	if (dirstat.st_uid != uid || dirstat.st_gid != gid) {
+		if (dirstat.st_dev || dirstat.st_ino)
+			einfo ("%s: correcting owner", path);
+		if (chown (path, uid, gid)) {
+			eerror ("%s: chown: %s", applet, strerror (errno));
+			return (-1);
+		}
+	}
+
+	return (0);
+}
+
+/* Based on busybox */
+static int parse_mode (mode_t *mode, char *text)
+{
+	/* Check for a numeric mode */
+	if ((*mode - '0') < 8) {
+		char *p;
+		unsigned long l = strtoul (text, &p, 8);
+		if (*p || l > 07777U) {
+			errno = EINVAL;
+			return (-1);
+		}
+		*mode = l;
+		return (0);
+	}
+
+	/* We currently don't check g+w type stuff */
+	errno = EINVAL;
+	return (-1);
+}
+
+static struct passwd *get_user (char **name)
+{
+	struct passwd *pw;
+	char *p = *name;
+	char *token;
+	int tid;
+
+	token = strsep (&p, ":");
+	if (sscanf (token, "%d", &tid) != 1)
+		pw = getpwnam (token);
+	else
+		pw = getpwuid (tid);
+
+	if (! pw)
+		eerrorx ("%s: user `%s' not found", applet, token);
+
+	*name = p;
+	return (pw);
+}
+
+static struct group *get_group (const char *name)
+{
+	struct group *gr;
+	int tid;
+
+	if (sscanf (name, "%d", &tid) != 1)
+		gr = getgrnam (name);
+	else
+		gr = getgrgid (tid);
+
+	if (! gr)
+		eerrorx ("%s: group `%s' not found", applet, name);
+
+	return (gr);
+}
+
+#include "_usage.h"
+#define getoptstring "m:g:u:" getoptstring_COMMON
+static struct option longopts[] = {
+	{ "mode",			1, NULL, 'm'},
+	{ "user",           1, NULL, 'u'},
+	{ "group",          1, NULL, 'g'},
+	longopts_COMMON
+	{ NULL,             0, NULL, 0}
+};
+#include "_usage.c"
+
+int checkown (int argc, char **argv)
+{
+	int opt;
+	uid_t uid = geteuid();
+	gid_t gid = getgid();
+	mode_t mode = 0;
+
+	struct passwd *pw = NULL;
+	struct group *gr = NULL;
+	char *p;
+	int retval = EXIT_SUCCESS;
+
+	applet = argv[0];
+
+	while ((opt = getopt_long (argc, argv, getoptstring,
+							   longopts, (int *) 0)) != -1)
+	{
+		switch (opt) {
+			case 'm':
+				if (parse_mode (&mode, optarg))
+					eerrorx ("%s: invalid mode `%s'", applet, optarg);
+				break;
+			case 'u':
+				p = optarg;
+				pw = get_user (&p);
+				if (p && *p)
+					optarg = p;
+				else
+					break;
+			case 'g':
+				gr = get_group (optarg);
+				break;
+
+				case_RC_COMMON_GETOPT
+		}
+	}
+
+	if (pw) {
+		uid = pw->pw_uid;
+		gid = pw->pw_gid;
+	}
+	if (gr)
+		gid = gr->gr_gid;
+
+	while (optind < argc) {
+		if (do_check (argv[optind], uid, gid, mode))
+			retval = EXIT_FAILURE;
+		optind++;
+	}
+
+	exit (retval);
+}
-- 
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