From c271da9c858f583c4c51b03d0185c15bd6d4596d Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vlendec@samba.org>
Date: Mon, 5 Jan 1998 22:56:29 +0000
Subject: the real source code for the smbfs utilities. Forgot to do cvs add
 first. Volker (This used to be commit
 65406a546e15e53fcb0b724d0df3bc56a784edff)

---
 source3/client/smbumount.c | 191 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 191 insertions(+)
 create mode 100644 source3/client/smbumount.c

(limited to 'source3/client/smbumount.c')

diff --git a/source3/client/smbumount.c b/source3/client/smbumount.c
new file mode 100644
index 0000000000..304da24ff6
--- /dev/null
+++ b/source3/client/smbumount.c
@@ -0,0 +1,191 @@
+/*
+ *  smbumount.c
+ *
+ *  Copyright (C) 1995 by Volker Lendecke
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/socket.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+/* #include <sys/wait.h> */  /* generates a warning here */
+extern pid_t waitpid(pid_t, int *, int);
+#include <sys/errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <sys/mount.h>
+#include <mntent.h>
+
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+#include <linux/smb.h>
+#include <linux/smb_mount.h>
+#include <linux/smb_fs.h>
+
+static char *progname;
+
+static void
+usage(void)
+{
+        printf("usage: %s mount-point\n", progname);
+}
+
+static int
+umount_ok(const char *mount_point)
+{
+        int fid = open(mount_point, O_RDONLY, 0);
+        uid_t mount_uid;
+
+        if (fid == -1) {
+                fprintf(stderr, "Could not open %s: %s\n",
+                        mount_point, strerror(errno));
+                return -1;
+        }
+        
+        if (ioctl(fid, SMB_IOC_GETMOUNTUID, &mount_uid) != 0) {
+                fprintf(stderr, "%s probably not smb-filesystem\n",
+                        mount_point);
+                return -1;
+        }
+
+        if (   (getuid() != 0)
+            && (mount_uid != getuid())) {
+                fprintf(stderr, "You are not allowed to umount %s\n",
+                        mount_point);
+                return -1;
+        }
+
+        close(fid);
+        return 0;
+}
+
+/* Make a canonical pathname from PATH.  Returns a freshly malloced string.
+   It is up the *caller* to ensure that the PATH is sensible.  i.e.
+   canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
+   is not a legal pathname for ``/dev/fd0.''  Anything we cannot parse
+   we return unmodified.   */
+char *
+canonicalize (const char *path)
+{
+	char *canonical = malloc (PATH_MAX + 1);
+
+	if (strlen(path) > PATH_MAX)
+	{
+		fprintf(stderr, "Mount point string too long\n");
+		return NULL;
+	}
+
+	if (path == NULL)
+		return NULL;
+  
+	if (realpath (path, canonical))
+		return canonical;
+
+	strcpy (canonical, path);
+	return canonical;
+}
+
+
+int 
+main(int argc, char *argv[])
+{
+        int fd;
+
+        char* mount_point;
+
+        struct mntent *mnt;
+        FILE* mtab;
+        FILE* new_mtab;
+
+        progname = argv[0];
+
+        if (argc != 2) {
+                usage();
+                exit(1);
+        }
+
+        if (geteuid() != 0) {
+                fprintf(stderr, "%s must be installed suid root\n", progname);
+                exit(1);
+        }
+
+        mount_point = canonicalize(argv[1]);
+
+	if (mount_point == NULL)
+	{
+		exit(1);
+	}
+
+        if (umount_ok(mount_point) != 0) {
+                exit(1);
+        }
+
+        if (umount(mount_point) != 0) {
+                fprintf(stderr, "Could not umount %s: %s\n",
+                        mount_point, strerror(errno));
+                exit(1);
+        }
+
+        if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
+        {
+                fprintf(stderr, "Can't get "MOUNTED"~ lock file");
+                return 1;
+        }
+        close(fd);
+	
+        if ((mtab = setmntent(MOUNTED, "r")) == NULL) {
+                fprintf(stderr, "Can't open " MOUNTED ": %s\n",
+                        strerror(errno));
+                return 1;
+        }
+
+#define MOUNTED_TMP MOUNTED".tmp"
+
+        if ((new_mtab = setmntent(MOUNTED_TMP, "w")) == NULL) {
+                fprintf(stderr, "Can't open " MOUNTED_TMP ": %s\n",
+                        strerror(errno));
+                endmntent(mtab);
+                return 1;
+        }
+
+        while ((mnt = getmntent(mtab)) != NULL) {
+                if (strcmp(mnt->mnt_dir, mount_point) != 0) {
+                        addmntent(new_mtab, mnt);
+                }
+        }
+
+        endmntent(mtab);
+
+        if (fchmod (fileno (new_mtab), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) < 0) {
+                fprintf(stderr, "Error changing mode of %s: %s\n",
+                        MOUNTED_TMP, strerror(errno));
+                exit(1);
+        }
+
+        endmntent(new_mtab);
+
+        if (rename(MOUNTED_TMP, MOUNTED) < 0) {
+                fprintf(stderr, "Cannot rename %s to %s: %s\n",
+                        MOUNTED, MOUNTED_TMP, strerror(errno));
+                exit(1);
+        }
+
+        if (unlink(MOUNTED"~") == -1)
+        {
+                fprintf(stderr, "Can't remove "MOUNTED"~");
+                return 1;
+        }
+
+	return 0;
+}	
-- 
cgit