r6255: Initial checkin of cifs umount utility

(This used to be commit 8f7c36a6c442ce5030be546b761f807fd2fa8087)

diff --git a/source3/client/umount.cifs.c b/source3/client/umount.cifs.c
new file mode 100644 (file)
index 0000000..0210de8
--- /dev/null
+++ b/source3/client/umount.cifs.c
@@ -0,0 +1,266 @@
+/* 
+   Unmount utility program for Linux CIFS VFS (virtual filesystem) client
+   Copyright (C) 2005 Steve French  (sfrench@us.ibm.com)
+
+   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <errno.h>
+#include <string.h>
+#include <mntent.h>
+
+#define UNMOUNT_CIFS_VERSION_MAJOR "0"
+#define UNMOUNT_CIFS_VERSION_MINOR "1"
+
+#ifndef UNMOUNT_CIFS_VENDOR_SUFFIX
+#define UNMOUNT_CIFS_VENDOR_SUFFIX ""
+#endif
+
+#ifndef MNT_DETACH
+#define MNT_DETACH 0x02
+#endif
+
+#ifndef MNT_EXPIRE
+#define MNT_EXPIRE 0x04
+#endif
+
+#define CIFS_IOC_CHECKUMOUNT _IOR('u', 2, int)
+   
+static struct option longopts[] = {
+       { "all", 0, NULL, 'a' },
+       { "help",0, NULL, 'h' },
+       { "read-only", 0, NULL, 'r' },
+       { "ro", 0, NULL, 'r' },
+       { "verbose", 0, NULL, 'v' },
+       { "version", 0, NULL, 'V' },
+       { "expire", 0, NULL, 'e' },
+       { "force", 0, 0, 'f' },
+       { "lazy", 0, 0, 'l' },
+       { "no-mtab", 0, 0, 'n' },
+       { NULL, 0, NULL, 0 }
+};
+
+char * thisprogram;
+int verboseflg = 0;
+
+static void umount_cifs_usage(void)
+{
+       printf("\nUsage:  %s <remotetarget> <dir>\n", thisprogram);
+       printf("\nUnmount the specified directory\n");
+       printf("\nLess commonly used options:");
+       printf("\n\t-r\tIf mount fails, retry with readonly remount.");
+       printf("\n\t-n\tDo not write to mtab.");
+       printf("\n\t-f\tAttempt a forced unmount, even if the fs is busy.");
+       printf("\n\t-l\tAttempt lazy unmount, Unmount now, cleanup later.");
+       printf("\n\t-v\tEnable verbose mode (may be useful for debugging).");
+       printf("\n\t-h\tDisplay this help.");
+       printf("\n\nOptions are described in more detail in the manual page");
+       printf("\n\tman 8 umount.cifs\n");
+       printf("\nTo display the version number of the cifs umount utility:");
+       printf("\n\t%s -V\n",thisprogram);
+}
+
+static int umount_check_perm(char * dir)
+{
+       int fileid;
+       int rc;
+
+       /* presumably can not chdir into the target as we do on mount */
+
+       fileid = open(dir, O_RDONLY | O_DIRECTORY | O_NOFOLLOW, 0);
+
+       /* check if fileid valid if fileid == -1 BB FIXME */
+
+       rc = ioctl(fileid, CIFS_IOC_CHECKUMOUNT, NULL);
+
+       if(verboseflg)
+               printf("ioctl returned %d with errno %d\n",rc,errno);
+
+       close(fileid);
+
+       return rc;
+}
+
+int main(int argc, char ** argv)
+{
+       int c;
+       int rc;
+       int flags = 0;
+       int nomtab = 0;
+       int retry_remount = 0;
+       struct mntent mountent;
+       char * mountpoint;
+       FILE * pmntfile;
+
+       if(argc && argv) {
+               thisprogram = argv[0];
+       } else {
+               umount_cifs_usage();
+               return -EINVAL;
+       }
+
+       if(argc < 2) {
+               umount_cifs_usage();
+               return -EINVAL;
+       }
+
+       if(thisprogram == NULL)
+               thisprogram = "umount.cifs";
+
+       /* add sharename in opts string as unc= parm */
+
+       while ((c = getopt_long (argc, argv, "afhilnrvV",
+                        longopts, NULL)) != -1) {
+               switch (c) {
+/* No code to do the following  option yet */
+/*             case 'a':              
+                       ++umount_all;
+                       break; */
+               case '?':
+               case 'h':   /* help */
+                       umount_cifs_usage();
+                       exit(1);
+               case 'n':
+                       ++nomtab;
+                       break;
+               case 'f':
+                       flags |= MNT_FORCE;
+                       break;
+               case 'l':
+                       flags |= MNT_DETACH; /* lazy unmount */
+                       break;
+               case 'e':
+                       flags |= MNT_EXPIRE; /* gradually timeout */
+                       break;
+               case 'r':
+                       ++retry_remount;
+                       break;
+               case 'v':
+                       ++verboseflg;
+                       break;
+               case 'V':          
+                       printf ("umount.cifs version: %s.%s%s\n",
+                               UNMOUNT_CIFS_VERSION_MAJOR,
+                               UNMOUNT_CIFS_VERSION_MINOR,
+                               UNMOUNT_CIFS_VENDOR_SUFFIX);
+                       exit (0);
+               default:
+                       printf("unknown unmount option %c\n",c);
+                       umount_cifs_usage();
+                       exit(1);
+               }
+       }
+
+       /* move past the umount options */
+       argv += optind;
+       argc -= optind;
+
+       mountpoint = argv[0];
+
+       if((argc < 1) || (argv[0] == NULL)) {
+               printf("\nMissing name of unmount directory\n");
+               umount_cifs_usage();
+               return -EINVAL;
+       }
+
+       if(verboseflg)
+               printf("optind %d unmount dir %s\n",optind, mountpoint);
+
+       /* check if running effectively root */
+       if(geteuid() != 0)
+               printf("Trying to unmount when %s not installed suid\n",thisprogram);
+
+       /* fixup path if needed */
+
+       /* check if our uid was the one who mounted */
+       rc = umount_check_perm(mountpoint);
+       if (rc) {
+               return rc;
+       }
+
+       if(umount2(mountpoint, flags)) {
+       /* remember to kill daemon on error */
+
+               switch (errno) {
+               case 0:
+                       printf("mount failed but no error number set\n");
+                       break;
+               default:
+                       
+                       printf("mount error %d = %s\n",errno,strerror(errno));
+               }
+               printf("Refer to the umount.cifs(8) manual page (e.g.man 8 umount.cifs)\n");
+               return -1;
+       } else {
+               pmntfile = setmntent(MOUNTED, "a+");
+               if(pmntfile) {
+/*                     mountent.mnt_fsname = share_name;
+                       mountent.mnt_dir = mountpoint; 
+                       mountent.mnt_type = "cifs"; 
+                       mountent.mnt_opts = malloc(220);
+                       if(mountent.mnt_opts) {
+                               char * mount_user = getusername();
+                               memset(mountent.mnt_opts,0,200);
+                               if(flags & MS_RDONLY)
+                                       strcat(mountent.mnt_opts,"ro");
+                               else
+                                       strcat(mountent.mnt_opts,"rw");
+                               if(flags & MS_MANDLOCK)
+                                       strcat(mountent.mnt_opts,",mand");
+                               else
+                                       strcat(mountent.mnt_opts,",nomand");
+                               if(flags & MS_NOEXEC)
+                                       strcat(mountent.mnt_opts,",noexec");
+                               if(flags & MS_NOSUID)
+                                       strcat(mountent.mnt_opts,",nosuid");
+                               if(flags & MS_NODEV)
+                                       strcat(mountent.mnt_opts,",nodev");
+                               if(flags & MS_SYNCHRONOUS)
+                                       strcat(mountent.mnt_opts,",synch");
+                               if(mount_user) {
+                                       if(getuid() != 0) {
+                                               strcat(mountent.mnt_opts,",user=");
+                                               strcat(mountent.mnt_opts,mount_user);
+                                       }
+                                       free(mount_user);
+                               }
+                       }
+                       mountent.mnt_freq = 0;
+                       mountent.mnt_passno = 0;
+                       rc = addmntent(pmntfile,&mountent);
+                       endmntent(pmntfile);
+                       if(mountent.mnt_opts)
+                               free(mountent.mnt_opts);*/
+               } else {
+                   printf("could not update mount table\n");
+               }
+       }
+
+       return 0;
+}
+