livefiles_hfs_plugin/lf_hfs_dirops_handler.c

   1 /*  Copyright © 2017-2018 Apple Inc. All rights reserved.
   2  *
   3  *  lf_hfs_fileops_handler.c
   4  *  livefiles_hfs
   5  *
   6  *  Created by Yakov Ben Zaken on 31/12/2017.
   7  */
   8
   9 #include "lf_hfs_dirops_handler.h"
  10 #include "lf_hfs_fileops_handler.h"
  11 #include "lf_hfs_vnode.h"
  12 #include "lf_hfs_lookup.h"
  13 #include "lf_hfs_logger.h"
  14 #include "lf_hfs_vnops.h"
  15 #include "lf_hfs_vfsutils.h"
  16 #include "lf_hfs_attrlist.h"
  17 #include "lf_hfs_vfsops.h"
  18
  19 //---------------------------------- Functions Decleration ---------------------------------------
  20 static int DIROPS_VerifyCookieAndVerifier(uint64_t uCookie, vnode_t psParentVnode, uint64_t uVerifier);
  21 //---------------------------------- Functions Implementation ------------------------------------
  22
  23 static int
  24 DIROPS_VerifyCookieAndVerifier(uint64_t uCookie, vnode_t psParentVnode, uint64_t uVerifier)
  25 {
  26     int iError = 0;
  27     struct cnode* dcp = VTOC(psParentVnode);
  28
  29     if ( uCookie == 0 )
  30     {
  31         if ( uVerifier != UVFS_DIRCOOKIE_VERIFIER_INITIAL )
  32         {
  33             iError =  UVFS_READDIR_VERIFIER_MISMATCHED;
  34             goto exit;
  35         }
  36     }
  37     else if (uCookie == UVFS_DIRCOOKIE_EOF)
  38     {
  39         iError =  UVFS_READDIR_EOF_REACHED;
  40         goto exit;
  41     }
  42     else if ( uVerifier != psParentVnode->sExtraData.sDirData.uDirVersion )
  43     {
  44         iError = UVFS_READDIR_VERIFIER_MISMATCHED;
  45         goto exit;
  46     }
  47
  48     cnid_t uChildIndex = (cnid_t)(uCookie & HFS_INDEX_MASK);
  49     if (uChildIndex > (dcp->c_entries + 2))
  50     { /* searching pass the last item */
  51         iError = UVFS_READDIR_BAD_COOKIE;
  52     }
  53
  54 exit:
  55     return iError;
  56 }
  57
  58 int DIROPS_RemoveInternal( UVFSFileNode psDirNode, const char *pcUTF8Name )
  59 {
  60     int iErr = 0;
  61     vnode_t psParentVnode               = (vnode_t)psDirNode;
  62     UVFSFileNode psFileNode             = {0};
  63
  64     if (!vnode_isdir(psParentVnode))
  65     {
  66         return ENOTDIR;
  67     }
  68
  69     iErr = DIROPS_LookupInternal( psDirNode, pcUTF8Name, &psFileNode );
  70     if ( iErr != 0 )
  71     {
  72         goto exit;
  73     }
  74     vnode_t psVnode = (vnode_t)psFileNode;
  75
  76     if (vnode_isdir(psVnode))
  77     {
  78         return EISDIR;
  79     }
  80
  81     struct componentname sCompName  = {0};
  82     sCompName.cn_nameiop            = DELETE;
  83     sCompName.cn_flags              = ISLASTCN;
  84     sCompName.cn_pnbuf              = (char *)pcUTF8Name;
  85     sCompName.cn_pnlen              = (int)strlen(pcUTF8Name);
  86     sCompName.cn_nameptr            = (char *)pcUTF8Name;
  87     sCompName.cn_namelen            = (int)strlen(pcUTF8Name);
  88     sCompName.cn_hash               = 0;
  89     sCompName.cn_consume            = (int)strlen(pcUTF8Name);
  90
  91     iErr = hfs_vnop_remove(psParentVnode,psVnode, &sCompName, VNODE_REMOVE_NODELETEBUSY | VNODE_REMOVE_SKIP_NAMESPACE_EVENT );
  92
  93     LFHFS_Reclaim(psFileNode);
  94
  95 exit:
  96     return iErr;
  97 }
  98
  99 int DIROPS_LookupInternal( UVFSFileNode psDirNode, const char *pcUTF8Name, UVFSFileNode *ppsOutNode )
 100 {
 101     int iErr = 0;
 102     // We are not supporting "." and ".." lookup.
 103     if ( (strcmp( (char*)pcUTF8Name, "." ) == 0) || (strcmp( (char*)pcUTF8Name, ".." ) == 0) )
 104     {
 105         *ppsOutNode = NULL;
 106         iErr = EPERM;
 107         goto exit;
 108     }
 109
 110     vnode_t psVnode = (vnode_t)psDirNode;
 111
 112     if (!vnode_isdir(psVnode))
 113     {
 114         iErr = ENOTDIR;
 115         goto exit;
 116     }
 117
 118     struct componentname    sCompName       = {0};
 119     sCompName.cn_nameiop    = LOOKUP;
 120     sCompName.cn_flags      = ISLASTCN;
 121     sCompName.cn_pnbuf      = (char *)pcUTF8Name;
 122     sCompName.cn_pnlen      = (int)strlen(pcUTF8Name);
 123     sCompName.cn_nameptr    = (char *)pcUTF8Name;
 124     sCompName.cn_namelen    = (int)strlen(pcUTF8Name);
 125     sCompName.cn_hash       = 0;
 126     sCompName.cn_consume    = (int)strlen(pcUTF8Name);
 127
 128     iErr = hfs_vnop_lookup( psVnode, (vnode_t*)ppsOutNode, &sCompName );
 129
 130 exit:
 131     return iErr;
 132 }
 133
 134 int
 135 LFHFS_MkDir ( UVFSFileNode psDirNode, const char *pcName, const UVFSFileAttributes *psFileAttr, UVFSFileNode *ppsOutNode )
 136 {
 137     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_MkDir\n");
 138     VERIFY_NODE_IS_VALID(psDirNode);
 139
 140     int iError = 0;
 141     vnode_t psParentVnode = (vnode_t)psDirNode;
 142
 143     if (!vnode_isdir(psParentVnode))
 144     {
 145         iError = ENOTDIR;
 146         goto exit;
 147     }
 148
 149     //@param cnp Name information for new directory.
 150     struct componentname sNewDirComponentName = {0};
 151     sNewDirComponentName.cn_nameptr = (char*) pcName;
 152     sNewDirComponentName.cn_namelen = (int) strlen(pcName);
 153
 154     iError = hfs_vnop_mkdir(psParentVnode,(vnode_t*)ppsOutNode, &sNewDirComponentName, (UVFSFileAttributes *) psFileAttr);
 155
 156 exit:
 157     return iError;
 158 }
 159
 160 int
 161 LFHFS_RmDir ( UVFSFileNode psDirNode, const char *pcUTF8Name )
 162 {
 163     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_RmDir\n");
 164     VERIFY_NODE_IS_VALID(psDirNode);
 165
 166     int iErr                            = 0;
 167     vnode_t psParentVnode               = (vnode_t)psDirNode;
 168
 169     if (!vnode_isdir(psParentVnode))
 170     {
 171         iErr = ENOTDIR;
 172         goto exit;
 173     }
 174
 175     UVFSFileNode psFileNode             = {0};
 176     struct componentname    sCompName   = {0};
 177
 178     iErr = DIROPS_LookupInternal( psDirNode, pcUTF8Name, &psFileNode );
 179     if ( iErr != 0 )
 180     {
 181         goto exit;
 182     }
 183
 184     vnode_t psVnode = (vnode_t)psFileNode;
 185
 186     sCompName.cn_nameiop    = DELETE;
 187     sCompName.cn_flags      = ISLASTCN;
 188     sCompName.cn_pnbuf      = (char *)pcUTF8Name;
 189     sCompName.cn_pnlen      = (int)strlen(pcUTF8Name);
 190     sCompName.cn_nameptr    = (char *)pcUTF8Name;
 191     sCompName.cn_namelen    = (int)strlen(pcUTF8Name);
 192     sCompName.cn_hash       = 0;
 193     sCompName.cn_consume    = (int)strlen(pcUTF8Name);
 194
 195     iErr =  hfs_vnop_rmdir(psParentVnode, psVnode, &sCompName);
 196
 197     hfs_vnop_reclaim(psVnode);
 198
 199 exit:
 200     return iErr;
 201 }
 202
 203 int
 204 LFHFS_Remove ( UVFSFileNode psDirNode, const char *pcUTF8Name, __unused UVFSFileNode victimNode)
 205 {
 206     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_Remove\n");
 207     VERIFY_NODE_IS_VALID(psDirNode);
 208
 209     int iErr = DIROPS_RemoveInternal( psDirNode, pcUTF8Name );
 210     return iErr;
 211 }
 212
 213 int
 214 LFHFS_Lookup ( UVFSFileNode psDirNode, const char *pcUTF8Name, UVFSFileNode *ppsOutNode )
 215 {
 216     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_Lookup\n");
 217     VERIFY_NODE_IS_VALID(psDirNode);
 218
 219     return DIROPS_LookupInternal( psDirNode, pcUTF8Name, ppsOutNode );
 220 }
 221
 222 int
 223 LFHFS_ReadDir ( UVFSFileNode psDirNode, void* pvBuf, size_t iBufLen, uint64_t uCookie, size_t *iReadBytes, uint64_t *puVerifier )
 224 {
 225     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_ReadDir\n");
 226     VERIFY_NODE_IS_VALID(psDirNode);
 227
 228     int iError = 0;
 229     *iReadBytes = 0;
 230     struct vnode* psParentVnode = (struct vnode*) psDirNode;
 231
 232     if (iReadBytes == NULL || puVerifier == NULL)
 233     {
 234         return EINVAL;
 235     }
 236     *iReadBytes = 0;
 237
 238     // Make sure the UVFSFileNode is a directory.
 239     if ( !IS_DIR(psParentVnode) )
 240     {
 241         LFHFS_LOG(LEVEL_ERROR, "HFS_ReadDir node is not a directory.\n", ENOTDIR);
 242         return ENOTDIR;
 243     }
 244
 245     // Make sure there is a place for at least one entry with maximal allowed name
 246     uint64_t uMaxRecLen = UVFS_DIRENTRY_RECLEN(MAX_UTF8_NAME_LENGTH);
 247     if ( iBufLen < uMaxRecLen )
 248     {
 249         return EINVAL;
 250     }
 251
 252     iError = DIROPS_VerifyCookieAndVerifier(uCookie,psParentVnode, *puVerifier);
 253     if ( iError != 0 )
 254     {
 255         goto exit;
 256     }
 257
 258
 259     *puVerifier = psParentVnode->sExtraData.sDirData.uDirVersion;
 260
 261     //Setting readDir Args
 262     int iEofflag;
 263     int iNumdirent;
 264     int flags = VNODE_READDIR_EXTENDED|VNODE_READDIR_REQSEEKOFF;
 265     ReadDirBuff_s sReadDirBuffer = {0};
 266     sReadDirBuffer.pvBuffer = pvBuf;
 267     sReadDirBuffer.uBufferResid =  sReadDirBuffer.uBufferSize = iBufLen;
 268
 269     iError = hfs_vnop_readdir( psParentVnode, &iEofflag, &iNumdirent, &sReadDirBuffer, uCookie, flags);
 270
 271     if (iError)
 272         goto exit;
 273
 274     if (iNumdirent == 0)
 275     {
 276         if (iEofflag)
 277         {
 278             iError = UVFS_READDIR_EOF_REACHED;
 279         }
 280         else
 281         {
 282             iError = EINVAL;
 283         }
 284     }
 285
 286     *iReadBytes = sReadDirBuffer.uBufferSize - sReadDirBuffer.uBufferResid;
 287 exit:
 288     return iError;
 289 }
 290
 291 int
 292 LFHFS_ReadDirAttr( UVFSFileNode psDirNode, void *pvBuf, size_t iBufLen, uint64_t uCookie, size_t *iReadBytes, uint64_t *puVerifier )
 293 {
 294     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_ReadDirAttr\n");
 295     VERIFY_NODE_IS_VALID(psDirNode);
 296
 297     int iError = 0;
 298     *iReadBytes = 0;
 299     struct vnode* psParentVnode = (struct vnode*) psDirNode;
 300
 301     if (iReadBytes == NULL || puVerifier == NULL)
 302     {
 303         return EINVAL;
 304     }
 305     *iReadBytes = 0;
 306
 307     // Make sure the UVFSFileNode is a directory.
 308     if ( !IS_DIR(psParentVnode) )
 309     {
 310         LFHFS_LOG(LEVEL_ERROR, "HFS_ReadDir node is not a directory.\n", ENOTDIR);
 311         return ENOTDIR;
 312     }
 313
 314     // Make sure there is a place for at least one entry with maximal allowed name
 315     uint64_t uMaxRecLen = UVFS_DIRENTRY_RECLEN(MAX_UTF8_NAME_LENGTH);
 316     if ( iBufLen < uMaxRecLen )
 317     {
 318         return EINVAL;
 319     }
 320
 321     iError = DIROPS_VerifyCookieAndVerifier(uCookie, psParentVnode, *puVerifier);
 322     if ( iError != 0 )
 323     {
 324         goto exit;
 325     }
 326
 327     *puVerifier = psParentVnode->sExtraData.sDirData.uDirVersion;
 328
 329
 330     //Setting readDirAttr Args
 331     int iEofflag;
 332     int iNumdirent;
 333     ReadDirBuff_s sReadDirBuffer = {0};
 334     sReadDirBuffer.pvBuffer = pvBuf;
 335     sReadDirBuffer.uBufferResid =  sReadDirBuffer.uBufferSize = iBufLen;
 336
 337     iError = hfs_vnop_readdirattr( psParentVnode, &iEofflag, &iNumdirent, &sReadDirBuffer, uCookie);
 338
 339     if (iError)
 340         goto exit;
 341
 342     if (iNumdirent == 0)
 343     {
 344         if (iEofflag)
 345         {
 346             iError = UVFS_READDIR_EOF_REACHED;
 347         }
 348         else
 349         {
 350             iError = EINVAL;
 351         }
 352     }
 353
 354     *iReadBytes = sReadDirBuffer.uBufferSize - sReadDirBuffer.uBufferResid;
 355
 356 exit:
 357     return iError;
 358 }
 359
 360 int
 361 LFHFS_ScanDir(UVFSFileNode psDirNode, scandir_matching_request_t* psMatchingCriteria, scandir_matching_reply_t* psMatchingResult)
 362 {
 363     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_ScanDir\n");
 364     VERIFY_NODE_IS_VALID(psDirNode);
 365
 366     int iErr = 0;
 367     struct vnode* psParentVnode = (struct vnode*) psDirNode;
 368     // Make sure the UVFSFileNode is a directory.
 369     if ( !IS_DIR(psParentVnode) )
 370     {
 371         LFHFS_LOG(LEVEL_ERROR, "LFHFS_ScanDir node is not a directory.\n", ENOTDIR);
 372         return ENOTDIR;
 373     }
 374
 375     iErr = DIROPS_VerifyCookieAndVerifier(psMatchingCriteria->smr_start_cookie, psParentVnode, psMatchingCriteria->smr_verifier);
 376     if ( iErr != 0 )
 377     {
 378         goto exit;
 379     }
 380
 381     psMatchingResult->smr_result_type = 0;
 382     psMatchingResult->smr_verifier = psParentVnode->sExtraData.sDirData.uDirVersion;
 383     ScanDirRequest_s psScanDirRequest = {.psMatchingCriteria = psMatchingCriteria, .psMatchingResult = psMatchingResult};
 384
 385     iErr = hfs_scandir( psParentVnode, &psScanDirRequest);
 386
 387 exit:
 388     return iErr;
 389 }
 390
 391 int LFHFS_ScanIDs(UVFSFileNode psNode,
 392                  __unused uint64_t uRequestedAttributes,
 393                  const uint64_t* puFileIDArray,
 394                  unsigned int iFileIDCount,
 395                  scanids_match_block_t fMatchCallback)
 396 {
 397     int error = 0;
 398     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_ScanIDs\n");
 399     VERIFY_NODE_IS_VALID(psNode);
 400     struct vnode* psVnode = (struct vnode*) psNode;
 401
 402     char* pcName = malloc(sizeof(char)*MAX_UTF8_NAME_LENGTH);
 403     if (pcName == NULL)
 404         return ENOMEM;
 405
 406     for (uint32_t uIDCounter = 0; uIDCounter < iFileIDCount; uIDCounter++)
 407     {
 408         memset(pcName,0,sizeof(char)*MAX_UTF8_NAME_LENGTH);
 409         //if we got to the rootParentID just continue
 410         if ((cnid_t)puFileIDArray[uIDCounter] == kHFSRootParentID)
 411             continue;
 412
 413         UVFSFileAttributes sFileAttrs;
 414         error = hfs_GetInfoByID(VTOHFS(psVnode), (cnid_t)puFileIDArray[uIDCounter], &sFileAttrs, pcName);
 415         if (error == ENOENT) {
 416             error = 0;
 417             continue;
 418         }
 419
 420         if (!error) {
 421             if ((cnid_t)puFileIDArray[uIDCounter] == kHFSRootFolderID) {
 422                 sFileAttrs.fa_parentid = sFileAttrs.fa_fileid;
 423             }
 424             LFHFS_LOG(LEVEL_DEBUG, "scan found item %llu parent %llu",
 425                       sFileAttrs.fa_parentid, sFileAttrs.fa_fileid);
 426             fMatchCallback((int) uIDCounter, &sFileAttrs, pcName);
 427         } else {
 428             LFHFS_LOG(LEVEL_DEBUG, "LFHFS_ScanIDs: hfs_GetInfoByID failed with error %u\n",error);
 429             break;
 430         }
 431     }
 432
 433     free(pcName);
 434     return error;
 435 }