autoload.c

   1 /*
   2  * Copyright (c) 2000, Red Hat, Inc.
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     A copy of the GNU General Public License can be found at
  10  *     http://www.gnu.org/
  11  *
  12  * Written by DJ Delorie <dj@cygnus.com>
  13  *
  14  */
  15 #if 0
  16 static const char *cvsid = "\n%%% $Id$\n";
  17 #endif
  18
  19 #include "win32.h"
  20
  21 typedef struct {
  22   char *name;
  23   HINSTANCE handle;
  24 } DllInfo;
  25
  26 #define DLL(n) static DllInfo n ## _info __asm__ (#n "_info") = { #n, 0}
  27
  28 #define Auto(dll, func, size) \
  29         __asm__ ("\t.data"); \
  30         __asm__ ("\t.global\t_" #func "@" #size); \
  31         __asm__ ("_" #func "@" #size ":"); \
  32         __asm__ ("\tcall\tautoload_common"); \
  33         __asm__ ("\t.long\t" #dll "_info"); \
  34         __asm__ ("\t.ascii\t\"" #func "\\0\"")
  35
  36 DLL (wininet);
  37
  38 Auto (wininet, InternetAttemptConnect, 4);
  39 Auto (wininet, InternetCloseHandle, 4);
  40 Auto (wininet, InternetGetLastResponseInfoA, 12);
  41 Auto (wininet, InternetOpenA, 20);
  42 Auto (wininet, InternetOpenUrlA, 24);
  43 Auto (wininet, InternetReadFile, 16);
  44 Auto (wininet, InternetSetOptionA, 16);
  45 Auto (wininet, InternetQueryOptionA, 16);
  46 Auto (wininet, HttpQueryInfoA, 20);
  47 Auto (wininet, HttpSendRequestA, 20);
  48
  49 DLL (advapi32);
  50
  51 Auto (advapi32, AddAccessAllowedAce, 16);
  52 Auto (advapi32, AllocateAndInitializeSid, 44);
  53 Auto (advapi32, FreeSid, 4);
  54 Auto (advapi32, InitializeAcl, 12);
  55 Auto (advapi32, OpenProcessToken, 12);
  56 Auto (advapi32, SetTokenInformation, 16);
  57
  58 typedef struct {
  59   DllInfo *dll;
  60   char name[100];
  61 } AutoEntry;
  62
  63 static void autoload_common () __asm__ ("autoload_common");
  64
  65 static void
  66 autoload_common (int x)
  67 {
  68   int fp, rel;
  69   unsigned char *proc;
  70   HINSTANCE h;
  71   AutoEntry *a;
  72
  73   a = *(AutoEntry **)(&x - 1);
  74   if (a->dll->handle == 0)
  75     {
  76       h = LoadLibrary (a->dll->name);
  77       a->dll->handle = h;
  78     }
  79   fp = (int) GetProcAddress (a->dll->handle, a->name);
  80   proc = ((unsigned char *)a) - 5;
  81   rel = fp - (int)(a); /* now it's a relative call */
  82   *proc++ = 0xe9; /* jump near 32-bit relative */
  83   *proc++ = rel;
  84   *proc++ = rel>>8;
  85   *proc++ = rel>>16;
  86   *proc++ = rel>>24;
  87
  88   *(int *)(&x-1) = (int)proc-5;
  89 }