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 bool gpfs_getrealfilename;
  29 static bool gpfs_winattr;
  30 static bool gpfs_do_ftruncate;
  31
  32 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  33 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  34 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  35 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  36 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  37                                             int *buflen);
  38 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
  39 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
  40 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  41 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
  42 static int (*gpfs_lib_init_fn)(int flags);
  43
  44 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  45                         uint32 share_access)
  46 {
  47         unsigned int allow = GPFS_SHARE_NONE;
  48         unsigned int deny = GPFS_DENY_NONE;
  49         int result;
  50
  51         if (gpfs_set_share_fn == NULL) {
  52                 return False;
  53         }
  54
  55         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  56                 /* No real file, don't disturb */
  57                 return True;
  58         }
  59
  60         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  61                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  62         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  63                 GPFS_SHARE_READ : 0;
  64
  65         if (allow == GPFS_SHARE_NONE) {
  66                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  67         }
  68         else {
  69                 deny |= (share_access & FILE_SHARE_WRITE) ?
  70                         0 : GPFS_DENY_WRITE;
  71                 deny |= (share_access & (FILE_SHARE_READ)) ?
  72                         0 : GPFS_DENY_READ;
  73         }
  74         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  75                    access_mask, allow, share_access, deny));
  76
  77         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  78         if (result != 0) {
  79                 if (errno == ENOSYS) {
  80                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  81                                   "support has been compiled into Samba. Allowing access\n"));
  82                         return True;
  83                 } else {
  84                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  85                                    strerror(errno)));
  86                 }
  87         }
  88
  89         return (result == 0);
  90 }
  91
  92 int set_gpfs_lease(int fd, int leasetype)
  93 {
  94         int gpfs_type = GPFS_LEASE_NONE;
  95
  96         if (gpfs_set_lease_fn == NULL) {
  97                 errno = EINVAL;
  98                 return -1;
  99         }
 100
 101         if (leasetype == F_RDLCK) {
 102                 gpfs_type = GPFS_LEASE_READ;
 103         }
 104         if (leasetype == F_WRLCK) {
 105                 gpfs_type = GPFS_LEASE_WRITE;
 106         }
 107
 108         /* we unconditionally set CAP_LEASE, rather than looking for
 109            -1/EACCES as there is a bug in some versions of
 110            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 111            each time we try this with the wrong capabilities set
 112         */
 113         linux_set_lease_capability();
 114         return gpfs_set_lease_fn(fd, gpfs_type);
 115 }
 116
 117 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 118 {
 119         if (gpfs_getacl_fn == NULL) {
 120                 errno = ENOSYS;
 121                 return -1;
 122         }
 123
 124         return gpfs_getacl_fn(pathname, flags, acl);
 125 }
 126
 127 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 128 {
 129         if (gpfs_putacl_fn == NULL) {
 130                 errno = ENOSYS;
 131                 return -1;
 132         }
 133
 134         return gpfs_putacl_fn(pathname, flags, acl);
 135 }
 136
 137 int smbd_gpfs_ftruncate(int fd, gpfs_off64_t length)
 138 {
 139         if (!gpfs_do_ftruncate || (gpfs_ftruncate_fn == NULL)) {
 140                 errno = ENOSYS;
 141                 return -1;
 142         }
 143
 144         return gpfs_ftruncate_fn(fd, length);
 145 }
 146
 147 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 148                                     int *buflen)
 149 {
 150         if ((!gpfs_getrealfilename)
 151             || (gpfs_get_realfilename_path_fn == NULL)) {
 152                 errno = ENOSYS;
 153                 return -1;
 154         }
 155
 156         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 157 }
 158
 159 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 160 {
 161
 162         if ((!gpfs_winattr) || (gpfs_get_winattrs_path_fn == NULL)) {
 163                 errno = ENOSYS;
 164                 return -1;
 165         }
 166         DEBUG(10, ("gpfs_get_winattrs_path:open call %s\n",pathname));
 167         return gpfs_get_winattrs_path_fn(pathname, attrs);
 168 }
 169
 170 int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
 171 {
 172
 173         if ((!gpfs_winattr) || (gpfs_get_winattrs_fn == NULL)) {
 174                 errno = ENOSYS;
 175                 return -1;
 176         }
 177         DEBUG(10, ("gpfs_get_winattrs_path:open call %d\n", fd));
 178         return gpfs_get_winattrs_fn(fd, attrs);
 179 }
 180
 181 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 182 {
 183         if ((!gpfs_winattr) || (gpfs_set_winattrs_path_fn == NULL)) {
 184                 errno = ENOSYS;
 185                 return -1;
 186         }
 187
 188         DEBUG(10, ("gpfs_set_winattrs_path:open call %s\n",pathname));
 189         return gpfs_set_winattrs_path_fn(pathname,flags, attrs);
 190 }
 191
 192 void smbd_gpfs_lib_init()
 193 {
 194         if (gpfs_lib_init_fn) {
 195                 int rc = gpfs_lib_init_fn(0);
 196                 DEBUG(10, ("gpfs_lib_init() finished with rc %d "
 197                            "and errno %d\n", rc, errno));
 198         } else {
 199                 DEBUG(10, ("libgpfs lacks gpfs_lib_init\n"));
 200         }
 201 }
 202
 203 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 204                                    const char *libname,
 205                                    void *pfn_pointer, const char *fn_name)
 206 {
 207         bool did_open_here = false;
 208         void **libhandle_pointer = (void **)plibhandle_pointer;
 209         void **fn_pointer = (void **)pfn_pointer;
 210
 211         DEBUG(10, ("trying to load name %s from %s\n",
 212                    fn_name, libname));
 213
 214         if (*libhandle_pointer == NULL) {
 215                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 216                 did_open_here = true;
 217         }
 218         if (*libhandle_pointer == NULL) {
 219                 DEBUG(10, ("Could not open lib %s\n", libname));
 220                 return false;
 221         }
 222
 223         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 224         if (*fn_pointer == NULL) {
 225                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 226                            fn_name, libname));
 227                 if (did_open_here) {
 228                         dlclose(*libhandle_pointer);
 229                         *libhandle_pointer = NULL;
 230                 }
 231                 return false;
 232         }
 233
 234         return true;
 235 }
 236
 237 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 238 {
 239         static void *libgpfs_handle = NULL;
 240         static void *libgpfs_gpl_handle = NULL;
 241
 242         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 243                                    fn_pointer, fn_name)) {
 244                 return true;
 245         }
 246         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 247                                    fn_pointer, fn_name)) {
 248                 return true;
 249         }
 250         return false;
 251 }
 252
 253 void init_gpfs(void)
 254 {
 255         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 256         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 257         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 258         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 259         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 260                            "gpfs_get_realfilename_path");
 261         init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
 262         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
 263         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
 264         init_gpfs_function(&gpfs_ftruncate_fn, "gpfs_ftruncate");
 265         init_gpfs_function(&gpfs_lib_init_fn,"gpfs_lib_init");
 266
 267         gpfs_getrealfilename = lp_parm_bool(-1, "gpfs", "getrealfilename",
 268                                             True);
 269         gpfs_winattr = lp_parm_bool(-1, "gpfs", "winattr", False);
 270         gpfs_do_ftruncate = lp_parm_bool(-1, "gpfs", "ftruncate", True);
 271
 272         return;
 273 }