git.sesse.net Git - rdpsrv/blob - Xserver/lib/Xau/AuGetBest.c

   1 /* $XConsortium: AuGetBest.c /main/23 1996/12/04 11:04:55 lehors $ */
   2
   3 /*
   4
   5 Copyright (c) 1988  X Consortium
   6
   7 Permission is hereby granted, free of charge, to any person obtaining a copy
   8 of this software and associated documentation files (the "Software"), to deal
   9 in the Software without restriction, including without limitation the rights
  10 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 copies of the Software, and to permit persons to whom the Software is
  12 furnished to do so, subject to the following conditions:
  13
  14 The above copyright notice and this permission notice shall be included in
  15 all copies or substantial portions of the Software.
  16
  17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  20 X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23
  24 Except as contained in this notice, the name of the X Consortium shall not be
  25 used in advertising or otherwise to promote the sale, use or other dealings
  26 in this Software without prior written authorization from the X Consortium.
  27
  28 */
  29
  30 #include <X11/Xauth.h>
  31 #include <X11/Xos.h>
  32 #ifdef XTHREADS
  33 #include <X11/Xthreads.h>
  34 #endif
  35 #ifdef hpux
  36 #define X_INCLUDE_NETDB_H
  37 #define XOS_USE_NO_LOCKING
  38 #include <X11/Xos_r.h>
  39 #endif
  40
  41 static
  42 binaryEqual (a, b, len)
  43 register char   *a, *b;
  44 register int    len;
  45 {
  46     while (len--)
  47         if (*a++ != *b++)
  48             return 0;
  49     return 1;
  50 }
  51
  52 #if NeedFunctionPrototypes
  53 Xauth *
  54 XauGetBestAuthByAddr (
  55 #if NeedWidePrototypes
  56     unsigned int        family,
  57     unsigned int        address_length,
  58 #else
  59     unsigned short      family,
  60     unsigned short      address_length,
  61 #endif
  62     _Xconst char*       address,
  63 #if NeedWidePrototypes
  64     unsigned int        number_length,
  65 #else
  66     unsigned short      number_length,
  67 #endif
  68     _Xconst char*       number,
  69     int                 types_length,
  70     char**              types,
  71     _Xconst int*        type_lengths)
  72 #else
  73 Xauth *
  74 XauGetBestAuthByAddr (family, address_length, address,
  75                           number_length, number,
  76                           types_length, types, type_lengths)
  77     unsigned short      family;
  78     unsigned short      address_length;
  79     char                *address;
  80     unsigned short      number_length;
  81     char                *number;
  82     int                 types_length;
  83     char                **types;
  84     int                 *type_lengths;
  85 #endif
  86 {
  87     FILE    *auth_file;
  88     char    *auth_name;
  89     Xauth   *entry;
  90     Xauth   *best;
  91     int     best_type;
  92     int     type;
  93 #ifdef hpux
  94     char                *fully_qual_address;
  95     unsigned short      fully_qual_address_length;
  96 #endif
  97
  98     auth_name = XauFileName ();
  99     if (!auth_name)
 100         return 0;
 101     if (access (auth_name, R_OK) != 0)          /* checks REAL id */
 102         return 0;
 103     auth_file = fopen (auth_name, "rb");
 104     if (!auth_file)
 105         return 0;
 106
 107 #ifdef hpux
 108     if (family == FamilyLocal) {
 109         _Xgethostbynameparams hparams;
 110         struct hostent *hostp;
 111
 112         /* make sure we try fully-qualified hostname */
 113         if ((hostp = _XGethostbyname(address,hparams)) != NULL) {
 114             fully_qual_address = hostp->h_name;
 115             fully_qual_address_length = strlen(fully_qual_address);
 116         }
 117         else
 118         {
 119             fully_qual_address = NULL;
 120             fully_qual_address_length = 0;
 121         }
 122     }
 123 #endif /* hpux */
 124
 125     best = 0;
 126     best_type = types_length;
 127     for (;;) {
 128         entry = XauReadAuth (auth_file);
 129         if (!entry)
 130             break;
 131         /*
 132          * Match when:
 133          *   either family or entry->family are FamilyWild or
 134          *    family and entry->family are the same
 135          *  and
 136          *   either address or entry->address are empty or
 137          *    address and entry->address are the same
 138          *  and
 139          *   either number or entry->number are empty or
 140          *    number and entry->number are the same
 141          *  and
 142          *   name matches one of the specified names, or no names
 143          *    were specified
 144          */
 145
 146         if ((family == FamilyWild || entry->family == FamilyWild ||
 147              (entry->family == family &&
 148              ((address_length == entry->address_length &&
 149               binaryEqual (entry->address, address, (int)address_length))
 150 #ifdef hpux
 151              || (family == FamilyLocal &&
 152                 fully_qual_address_length == entry->address_length &&
 153                 binaryEqual (entry->address, fully_qual_address,
 154                     (int) fully_qual_address_length))
 155 #endif
 156             ))) &&
 157             (number_length == 0 || entry->number_length == 0 ||
 158              (number_length == entry->number_length &&
 159               binaryEqual (entry->number, number, (int)number_length))))
 160         {
 161             if (best_type == 0)
 162             {
 163                 best = entry;
 164                 break;
 165             }
 166             for (type = 0; type < best_type; type++)
 167                 if (type_lengths[type] == entry->name_length &&
 168                     !(strncmp (types[type], entry->name, entry->name_length)))
 169                 {
 170                     break;
 171                 }
 172             if (type < best_type)
 173             {
 174                 if (best)
 175                     XauDisposeAuth (best);
 176                 best = entry;
 177                 best_type = type;
 178                 if (type == 0)
 179                     break;
 180                 continue;
 181             }
 182         }
 183         XauDisposeAuth (entry);
 184     }
 185     (void) fclose (auth_file);
 186     return best;
 187 }