SQLite

#endif

/*
** Maximum supported path-length.
*/
#define MAX_PATHNAME 512

/*
** Maximum supported symbolic links
*/
#define SQLITE_MAX_SYMLINKS 100

/* Always cast the getpid() return type for compatibility with
** kernel modules in VxWorks. */
#define osGetpid(X) (pid_t)getpid()

/*
** Only set the lastErrno if the error code is a real error and not 
** a normal expected return code of SQLITE_BUSY or SQLITE_OK

#if defined(HAVE_READLINK)
  { "readlink",     (sqlite3_syscall_ptr)readlink,        0 },
#else
  { "readlink",     (sqlite3_syscall_ptr)0,               0 },
#endif
#define osReadlink ((ssize_t(*)(const char*,char*,size_t))aSyscall[26].pCurrent)

#if defined(HAVE_LSTAT)
  { "lstat",         (sqlite3_syscall_ptr)lstat,          0 },
#else
  { "lstat",         (sqlite3_syscall_ptr)0,              0 },
#endif
#define osLstat      ((int(*)(const char*,struct stat*))aSyscall[27].pCurrent)

}; /* End of the overrideable system calls */


/*
** On some systems, calls to fchown() will trigger a message in a security
** log if they come from non-root processes.  So avoid calling fchown() if

    *pResOut = (0==osStat(zPath, &buf) && buf.st_size>0);
  }else{
    *pResOut = osAccess(zPath, W_OK|R_OK)==0;
  }
  return SQLITE_OK;
}

/*
**
*/
static int mkFullPathname(
  const char *zPath,              /* Input path */
  char *zOut,                     /* Output buffer */
  int nOut                        /* Allocated size of buffer zOut */
){
  int nPath = sqlite3Strlen30(zPath);
  int iOff = 0;
  if( zPath[0]!='/' ){
    if( osGetcwd(zOut, nOut-2)==0 ){
      return unixLogError(SQLITE_CANTOPEN_BKPT, "getcwd", zPath);
    }
    iOff = sqlite3Strlen30(zOut);
    zOut[iOff++] = '/';
  }
  if( (iOff+nPath+1)>nOut ){
    /* SQLite assumes that xFullPathname() nul-terminates the output buffer
    ** even if it returns an error.  */
    zOut[iOff] = '\0';
    return SQLITE_CANTOPEN_BKPT;
  }
  sqlite3_snprintf(nOut-iOff, &zOut[iOff], "%s", zPath);
  return SQLITE_OK;
}

/*
** Turn a relative pathname into a full pathname. The relative path
** is stored as a nul-terminated string in the buffer pointed to by
** zPath. 
**
** zOut points to a buffer of at least sqlite3_vfs.mxPathname bytes 
** (in this case, MAX_PATHNAME bytes). The full-path is written to
** this buffer before returning.
*/
static int unixFullPathname(
  sqlite3_vfs *pVfs,            /* Pointer to vfs object */
  const char *zPath,            /* Possibly relative input path */
  int nOut,                     /* Size of output buffer in bytes */
  char *zOut                    /* Output buffer */
){
#if !defined(HAVE_READLINK) || !defined(HAVE_LSTAT)
  return mkFullPathname(zPath, zOut, nOut);
#else
  int rc = SQLITE_OK;
  int nByte;
  int nLink = 1;                /* Number of symbolic links followed so far */
  const char *zIn = zPath;      /* Input path for each iteration of loop */
  char *zDel = 0;

  assert( pVfs->mxPathname==MAX_PATHNAME );
  UNUSED_PARAMETER(pVfs);

  /* It's odd to simulate an io-error here, but really this is just
  ** using the io-error infrastructure to test that SQLite handles this
  ** function failing. This function could fail if, for example, the
  ** current working directory has been unlinked.
  */
  SimulateIOError( return SQLITE_ERROR );

  assert( pVfs->mxPathname==MAX_PATHNAME );
  do {
  UNUSED_PARAMETER(pVfs);

#if defined(HAVE_READLINK)
  /* Attempt to resolve the path as if it were a symbolic link. If it is
  ** a symbolic link, the resolved path is stored in buffer zOut[]. Or, if
    /* Call stat() on path zIn. Set bLink to true if the path is a symbolic
    ** link, or false otherwise.  */
  ** the identified file is not a symbolic link or does not exist, then
  ** zPath is copied directly into zOut. Either way, nByte is left set to
  ** the size of the string copied into zOut[] in bytes.  */
  nByte = osReadlink(zPath, zOut, nOut-1);
  if( nByte<0 ){
    if( errno!=EINVAL && errno!=ENOENT ){
      return unixLogError(SQLITE_CANTOPEN_BKPT, "readlink", zPath);
    }
    int bLink = 0;
    struct stat buf;
    if( osLstat(zIn, &buf)!=0 ){
      if( errno!=ENOENT ){
        rc = unixLogError(SQLITE_CANTOPEN_BKPT, "lstat", zIn);
      }
    sqlite3_snprintf(nOut, zOut, "%s", zPath);
    nByte = sqlite3Strlen30(zOut);
  }else{
    zOut[nByte] = '\0';
  }
#endif

  /* If buffer zOut[] now contains an absolute path there is nothing more
  ** to do. If it contains a relative path, do the following:
    }else{
      bLink = S_ISLNK(buf.st_mode);
    }

    if( bLink ){
      if( zDel==0 ){
        zDel = sqlite3_malloc(nOut);
        if( zDel==0 ) rc = SQLITE_NOMEM;
      }else if( ++nLink>SQLITE_MAX_SYMLINKS ){
        rc = SQLITE_CANTOPEN_BKPT;
      }

      if( rc==SQLITE_OK ){
  **
  **   * move the relative path string so that it is at the end of th
  **     zOut[] buffer.
        nByte = osReadlink(zIn, zDel, nOut-1);
  **   * Call getcwd() to read the path of the current working directory 
  **     into the start of the zOut[] buffer.
  **   * Append a '/' character to the cwd string and move the 
  **     relative path back within the buffer so that it immediately 
  **     follows the '/'.
  **
  ** This code is written so that if the combination of the CWD and relative
  ** path are larger than the allocated size of zOut[] the CWD is silently
  ** truncated to make it fit. This is Ok, as SQLite refuses to open any
  ** file for which this function returns a full path larger than (nOut-8)
  ** bytes in size.  */
  testcase( nByte==nOut-5 );
  testcase( nByte==nOut-4 );
  if( zOut[0]!='/' && nByte<nOut-4 ){
    int nCwd;
    int nRem = nOut-nByte-1;
    memmove(&zOut[nRem], zOut, nByte+1);
    zOut[nRem-1] = '\0';
    if( osGetcwd(zOut, nRem-1)==0 ){
        if( nByte<0 ){
          rc = unixLogError(SQLITE_CANTOPEN_BKPT, "readlink", zIn);
        }else{
          if( zDel[0]!='/' ){
            int n;
            for(n = sqlite3Strlen30(zIn); n>0 && zIn[n-1]!='/'; n--);
            if( nByte+n+1>nOut ){
              rc = SQLITE_CANTOPEN_BKPT;
            }else{
              memmove(&zDel[n], zDel, nByte+1);
              memcpy(zDel, zIn, n);
              nByte += n;
            }
          }
          zDel[nByte] = '\0';
        }
      }

      return unixLogError(SQLITE_CANTOPEN_BKPT, "getcwd", zPath);
      zIn = zDel;
    }
    nCwd = sqlite3Strlen30(zOut);
    assert( nCwd<=nRem-1 );
    zOut[nCwd] = '/';

    assert( rc!=SQLITE_OK || zIn!=zOut || zIn[0]=='/' );
    if( rc==SQLITE_OK && zIn!=zOut ){
    memmove(&zOut[nCwd+1], &zOut[nRem], nByte+1);
  }
      rc = mkFullPathname(zIn, zOut, nOut);
    }
    if( bLink==0 ) break;
    zIn = zOut;
  }while( rc==SQLITE_OK );

  sqlite3_free(zDel);
  return SQLITE_OK;
  return rc;
#endif   /* HAVE_READLINK && HAVE_LSTAT */
}


#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Interfaces for opening a shared library, finding entry points
** within the shared library, and closing the shared library.

    UNIXVFS("unix-proxy",    proxyIoFinder ),
#endif
  };
  unsigned int i;          /* Loop counter */

  /* Double-check that the aSyscall[] array has been constructed
  ** correctly.  See ticket [bb3a86e890c8e96ab] */
  assert( ArraySize(aSyscall)==27 );
  assert( ArraySize(aSyscall)==28 );

  /* Register all VFSes defined in the aVfs[] array */
  for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
    sqlite3_vfs_register(&aVfs[i], i==0);
  }
  return SQLITE_OK; 
}

#define SQLITE_ENABLE_LOCKING_STYLE 0
#define HAVE_UTIME 1
#else
/* This is not VxWorks. */
#define OS_VXWORKS 0
#define HAVE_FCHOWN 1
#define HAVE_READLINK 1
#define HAVE_LSTAT 1
#endif /* defined(_WRS_KERNEL) */

do_test 1.4.1 {
  set ::log [list]
  list [catch { sqlite3 dbh /root/test.db } msg] $msg
} {1 {unable to open database file}}

do_re_test 1.4.2 { 
  lindex $::log 0
} {^os_unix.c:\d*: \(\d+\) (open|readlink)\(.*test.db\) - }
} {^os_unix.c:\d*: \(\d+\) (open|readlink|lstat)\(.*test.db\) - }

#--------------------------------------------------------------------------
# Tests oserror-1.* test failures in the unlink() system call.
#
ifcapable wal {
  do_test 2.1.1 {
    set ::log [list]

#-------------------------------------------------------------------------
# Test that journal and wal files are created next to the real file,
# not the symlink.
#
do_test 2.0 {
  catch { db close }
  catch { db2 close }
  forcedelete test.db test.db2
  forcedelete test.db test.db2 test.db3
  sqlite3 db test.db
  execsql { CREATE TABLE t1(x) }
  file link test.db2 test.db
  file link test.db3 test.db2
  set {} {}
} {}

foreach {tn f} {1 test.db2 2 test.db3} {
  do_test 2.$tn.1 {
  sqlite3 db2 test.db2
  file exists test.db-journal
} 0
    sqlite3 db2 $f
    file exists test.db-journal
  } 0

do_test 2.1 {
  execsql {
    BEGIN;
      INSERT INTO t1 VALUES(1);
  } db2
  file exists test.db-journal
} 1
do_test 2.2 {
  file exists test.db2-journal
} 0
do_test 2.3 {
  execsql {
    COMMIT;
    PRAGMA journal_mode = wal;
    INSERT INTO t1 VALUES(2);
  } db2
  file exists test.db-wal
} 1
do_test 2.4 {
  file exists test.db2-wal
} 0
do_execsql_test 2.5 {
  SELECT * FROM t1;
} {1 2}
  do_test 2.$tn.2 {
    execsql {
      BEGIN;
        INSERT INTO t1 VALUES(1);
    } db2
    file exists test.db-journal
  } 1
  do_test 2.$tn.3 {
    list [file exists test2.db-journal] [file exists test3.db-journal]
  } {0 0}
  do_test 2.$tn.4 {
    execsql {
      COMMIT;
      PRAGMA journal_mode = wal;
      INSERT INTO t1 VALUES(2);
    } db2
    file exists test.db-wal
  } 1
  do_test 2.$tn.5 {
    list [file exists test2.db-wal] [file exists test3.db-wal]
  } {0 0}
  do_execsql_test 2.$tn.6 {
    SELECT * FROM t1;
  } {1 2}
  db2 close
  do_execsql_test 2.$tn.7 {
    DELETE FROM t1;
    PRAGMA journal_mode = delete;
  } delete
}

# Try to open a ridiculously long pathname.  Bug found by
# Kostya Serebryany using libFuzzer on 2015-11-30.
#
do_test 3.1 {
  db close
  catch {sqlite3 db [string repeat [string repeat x 100]/ 6]} res
  set res
} {unable to open database file}

#-------------------------------------------------------------------------
# Test that relative symlinks that are not located in the cwd work.
#
do_test 4.1 {
  forcedelete x y z
  file mkdir x
  file mkdir y
  file mkdir z
  sqlite3 db x/test.db
  file link y/test.db ../x/test.db
  file link z/test.db ../y/test.db
  execsql {
    PRAGMA journal_mode = wal;
    CREATE TABLE t1(x, y);
    INSERT INTO t1 VALUES('hello', 'world');
  }
} {wal}

do_test 4.2.1 {
  db close
  sqlite3 db y/test.db
  db eval { SELECT * FROM t1 }
} {hello world}
do_test 4.2.2 {
  list [file exists x/test.db-wal] [file exists y/test.db-wal]
} {1 0}

do_test 4.3.1 {
  db close
  sqlite3 db z/test.db
  db eval { SELECT * FROM t1 }
} {hello world}
do_test 4.3.2 {
  list [file exists x/test.db-wal] [file exists y/test.db-wal] \
       [file exists z/test.db-wal]
} {1 0 0}

do_test 4.4.0 {
  forcedelete w
  file mkdir w
  file link w/test.db [file join [pwd] x/test.db] 
  set {} {}
} {}
do_test 4.4.1 {
  db close
  sqlite3 db w/test.db
  db eval { SELECT * FROM t1 }
} {hello world}
do_test 4.4.2 {
  list [file exists x/test.db-wal] [file exists w/test.db-wal]
} {1 0}

finish_test

# Tests for the xNextSystemCall method.
#
foreach s {
    open close access getcwd stat fstat ftruncate
    fcntl read pread write pwrite fchmod fallocate
    pread64 pwrite64 unlink openDirectory mkdir rmdir 
    statvfs fchown geteuid umask mmap munmap mremap
    getpagesize readlink
    getpagesize readlink lstat
} {
  if {[test_syscall exists $s]} {lappend syscall_list $s}
}
do_test 3.1 { lsort [test_syscall list] } [lsort $syscall_list]

#-------------------------------------------------------------------------
# This test verifies that if a call to open() fails and errno is set to