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Annotation of coherent/g/usr/lib/uucp/tay104/unix/indir.c, revision 1.1

1.1     ! root        1: /* indir.c
        !             2:    See if a file is in a directory.
        !             3: 
        !             4:    Copyright (C) 1992 Ian Lance Taylor
        !             5: 
        !             6:    This file is part of the Taylor UUCP package.
        !             7: 
        !             8:    This program is free software; you can redistribute it and/or
        !             9:    modify it under the terms of the GNU General Public License as
        !            10:    published by the Free Software Foundation; either version 2 of the
        !            11:    License, or (at your option) any later version.
        !            12: 
        !            13:    This program is distributed in the hope that it will be useful, but
        !            14:    WITHOUT ANY WARRANTY; without even the implied warranty of
        !            15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            16:    General Public License for more details.
        !            17: 
        !            18:    You should have received a copy of the GNU General Public License
        !            19:    along with this program; if not, write to the Free Software
        !            20:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            21: 
        !            22:    The author of the program may be contacted at [email protected] or
        !            23:    c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
        !            24:    */
        !            25: 
        !            26: #include "uucp.h"
        !            27: 
        !            28: #include "uudefs.h"
        !            29: #include "sysdep.h"
        !            30: #include "system.h"
        !            31: 
        !            32: #include <errno.h>
        !            33: 
        !            34: /* See whether a file is in a directory, and optionally check access.  */
        !            35: 
        !            36: boolean
        !            37: fsysdep_in_directory (zfile, zdir, fcheck, freadable, zuser)
        !            38:      const char *zfile;
        !            39:      const char *zdir;
        !            40:      boolean fcheck;
        !            41:      boolean freadable;
        !            42:      const char *zuser;
        !            43: {
        !            44:   size_t c;
        !            45:   char *zcopy, *zslash;
        !            46:   struct stat s;
        !            47: 
        !            48:   if (*zfile != '/')
        !            49:     return FALSE;
        !            50:   c = strlen (zdir);
        !            51:   if (c > 0 && zdir[c - 1] == '/')
        !            52:     c--;
        !            53:   if (strncmp (zfile, zdir, c) != 0
        !            54:       || (zfile[c] != '/' && zfile[c] != '\0'))
        !            55:     return FALSE;
        !            56:   if (strstr (zfile + c, "/../") != NULL)
        !            57:     return FALSE;
        !            58: 
        !            59:   /* If we're not checking access, get out now.  */
        !            60:   if (! fcheck)
        !            61:     return TRUE;
        !            62: 
        !            63:   zcopy = zbufcpy (zfile);
        !            64: 
        !            65:   /* Start checking directories after zdir.  Otherwise, we would
        !            66:      require that all directories down to /usr/spool/uucppublic be
        !            67:      publically searchable; they probably are but it should not be a
        !            68:      requirement.  */
        !            69:   zslash = zcopy + c;
        !            70:   do
        !            71:     {
        !            72:       char b;
        !            73:       struct stat shold;
        !            74: 
        !            75:       b = *zslash;
        !            76:       *zslash = '\0';
        !            77: 
        !            78:       shold = s;
        !            79:       if (stat (zcopy, &s) != 0)
        !            80:        {
        !            81:          if (errno != ENOENT)
        !            82:            {
        !            83:              ulog (LOG_ERROR, "stat (%s): %s", zcopy, strerror (errno));
        !            84:              ubuffree (zcopy);
        !            85:              return FALSE;
        !            86:            }
        !            87: 
        !            88:          /* If this is the top directory, any problems will be caught
        !            89:             later when we try to open it.  */
        !            90:          if (zslash == zcopy + c)
        !            91:            {
        !            92:              ubuffree (zcopy);
        !            93:              return TRUE;
        !            94:            }
        !            95: 
        !            96:          /* Go back and check the last directory for read or write
        !            97:             access.  */
        !            98:          s = shold;
        !            99:          break;
        !           100:        }
        !           101: 
        !           102:       /* If this is not a directory, get out of the loop.  */
        !           103:       if (! S_ISDIR (s.st_mode))
        !           104:        break;
        !           105: 
        !           106:       /* Make sure the directory is searchable.  */
        !           107:       if (! fsuser_access (&s, X_OK, zuser))
        !           108:        {
        !           109:          ulog (LOG_ERROR, "%s: %s", zcopy, strerror (EACCES));
        !           110:          ubuffree (zcopy);
        !           111:          return FALSE;
        !           112:        }
        !           113: 
        !           114:       /* If we've reached the end of the string, get out.  */
        !           115:       if (b == '\0')
        !           116:        break;
        !           117: 
        !           118:       *zslash = b;
        !           119:     }
        !           120:   while ((zslash = strchr (zslash + 1, '/')) != NULL);
        !           121: 
        !           122:   /* At this point s holds a stat on the last component of the path.
        !           123:      We must check it for readability or writeability.  */
        !           124:   if (! fsuser_access (&s, freadable ? R_OK : W_OK, zuser))
        !           125:     {
        !           126:       ulog (LOG_ERROR, "%s: %s", zcopy, strerror (EACCES));
        !           127:       ubuffree (zcopy);
        !           128:       return FALSE;
        !           129:     }
        !           130: 
        !           131:   ubuffree (zcopy);
        !           132:   return TRUE;
        !           133: }

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