source3/modules/gpfs.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Provide a connection to GPFS specific features
   4  *  Copyright (C) Volker Lendecke 2005
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "smbd/smbd.h"
  23
  24 #include "libcli/security/security.h"
  25 #include "gpfs_gpl.h"
  26 #include "vfs_gpfs.h"
  27
  28 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  29 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  30 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  31 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  32 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  33                                             int *buflen);
  34 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
  35 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
  36 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  37 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
  38 static int (*gpfs_lib_init_fn)(int flags);
  39
  40 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  41                         uint32 share_access)
  42 {
  43         unsigned int allow = GPFS_SHARE_NONE;
  44         unsigned int deny = GPFS_DENY_NONE;
  45         int result;
  46
  47         if (gpfs_set_share_fn == NULL) {
  48                 return False;
  49         }
  50
  51         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  52                 /* No real file, don't disturb */
  53                 return True;
  54         }
  55
  56         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  57                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  58         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  59                 GPFS_SHARE_READ : 0;
  60
  61         if (allow == GPFS_SHARE_NONE) {
  62                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  63         }
  64         else {
  65                 deny |= (share_access & FILE_SHARE_WRITE) ?
  66                         0 : GPFS_DENY_WRITE;
  67                 deny |= (share_access & (FILE_SHARE_READ)) ?
  68                         0 : GPFS_DENY_READ;
  69         }
  70         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  71                    access_mask, allow, share_access, deny));
  72
  73         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  74         if (result != 0) {
  75                 if (errno == ENOSYS) {
  76                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  77                                   "support has been compiled into Samba. Allowing access\n"));
  78                         return True;
  79                 } else {
  80                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  81                                    strerror(errno)));
  82                 }
  83         }
  84
  85         return (result == 0);
  86 }
  87
  88 int set_gpfs_lease(int fd, int leasetype)
  89 {
  90         int gpfs_type = GPFS_LEASE_NONE;
  91
  92         if (gpfs_set_lease_fn == NULL) {
  93                 errno = EINVAL;
  94                 return -1;
  95         }
  96
  97         if (leasetype == F_RDLCK) {
  98                 gpfs_type = GPFS_LEASE_READ;
  99         }
 100         if (leasetype == F_WRLCK) {
 101                 gpfs_type = GPFS_LEASE_WRITE;
 102         }
 103
 104         /* we unconditionally set CAP_LEASE, rather than looking for
 105            -1/EACCES as there is a bug in some versions of
 106            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 107            each time we try this with the wrong capabilities set
 108         */
 109         linux_set_lease_capability();
 110         return gpfs_set_lease_fn(fd, gpfs_type);
 111 }
 112
 113 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 114 {
 115         if (gpfs_getacl_fn == NULL) {
 116                 errno = ENOSYS;
 117                 return -1;
 118         }
 119
 120         return gpfs_getacl_fn(pathname, flags, acl);
 121 }
 122
 123 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 124 {
 125         if (gpfs_putacl_fn == NULL) {
 126                 errno = ENOSYS;
 127                 return -1;
 128         }
 129
 130         return gpfs_putacl_fn(pathname, flags, acl);
 131 }
 132
 133 int smbd_gpfs_ftruncate(int fd, gpfs_off64_t length)
 134 {
 135         if (gpfs_ftruncate_fn == NULL) {
 136                 errno = ENOSYS;
 137                 return -1;
 138         }
 139
 140         return gpfs_ftruncate_fn(fd, length);
 141 }
 142
 143 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 144                                     int *buflen)
 145 {
 146         if (gpfs_get_realfilename_path_fn == NULL) {
 147                 errno = ENOSYS;
 148                 return -1;
 149         }
 150
 151         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 152 }
 153
 154 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 155 {
 156
 157         if (gpfs_get_winattrs_path_fn == NULL) {
 158                 errno = ENOSYS;
 159                 return -1;
 160         }
 161         DEBUG(10, ("gpfs_get_winattrs_path:open call %s\n",pathname));
 162         return gpfs_get_winattrs_path_fn(pathname, attrs);
 163 }
 164
 165 int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
 166 {
 167
 168         if (gpfs_get_winattrs_fn == NULL) {
 169                 errno = ENOSYS;
 170                 return -1;
 171         }
 172         DEBUG(10, ("gpfs_get_winattrs_path:open call %d\n", fd));
 173         return gpfs_get_winattrs_fn(fd, attrs);
 174 }
 175
 176 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 177 {
 178         if (gpfs_set_winattrs_path_fn == NULL) {
 179                 errno = ENOSYS;
 180                 return -1;
 181         }
 182
 183         DEBUG(10, ("gpfs_set_winattrs_path:open call %s\n",pathname));
 184         return gpfs_set_winattrs_path_fn(pathname,flags, attrs);
 185 }
 186
 187 void smbd_gpfs_lib_init()
 188 {
 189         if (gpfs_lib_init_fn) {
 190                 int rc = gpfs_lib_init_fn(0);
 191                 DEBUG(10, ("gpfs_lib_init() finished with rc %d "
 192                            "and errno %d\n", rc, errno));
 193         } else {
 194                 DEBUG(10, ("libgpfs lacks gpfs_lib_init\n"));
 195         }
 196 }
 197
 198 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 199                                    const char *libname,
 200                                    void *pfn_pointer, const char *fn_name)
 201 {
 202         bool did_open_here = false;
 203         void **libhandle_pointer = (void **)plibhandle_pointer;
 204         void **fn_pointer = (void **)pfn_pointer;
 205
 206         DEBUG(10, ("trying to load name %s from %s\n",
 207                    fn_name, libname));
 208
 209         if (*libhandle_pointer == NULL) {
 210                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 211                 did_open_here = true;
 212         }
 213         if (*libhandle_pointer == NULL) {
 214                 DEBUG(10, ("Could not open lib %s\n", libname));
 215                 return false;
 216         }
 217
 218         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 219         if (*fn_pointer == NULL) {
 220                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 221                            fn_name, libname));
 222                 if (did_open_here) {
 223                         dlclose(*libhandle_pointer);
 224                         *libhandle_pointer = NULL;
 225                 }
 226                 return false;
 227         }
 228
 229         return true;
 230 }
 231
 232 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 233 {
 234         static void *libgpfs_handle = NULL;
 235         static void *libgpfs_gpl_handle = NULL;
 236
 237         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 238                                    fn_pointer, fn_name)) {
 239                 return true;
 240         }
 241         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 242                                    fn_pointer, fn_name)) {
 243                 return true;
 244         }
 245         return false;
 246 }
 247
 248 void init_gpfs(void)
 249 {
 250         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 251         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 252         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 253         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 254         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 255                            "gpfs_get_realfilename_path");
 256         init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
 257         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
 258         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
 259         init_gpfs_function(&gpfs_ftruncate_fn, "gpfs_ftruncate");
 260         init_gpfs_function(&gpfs_lib_init_fn,"gpfs_lib_init");
 261
 262         return;
 263 }