492 lines
17 KiB
C++
492 lines
17 KiB
C++
/* autoload.cc: all dynamic load stuff.
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Copyright 2000, 2001 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#define USE_SYS_TYPES_FD_SET
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#include <winsock2.h>
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/* Macro for defining "auto-load" functions.
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* Note that this is self-modifying code *gasp*.
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* The first invocation of a routine will trigger the loading of
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* the DLL. This will then be followed by the discovery of
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* the procedure's entry point, which is placed into the location
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* pointed to by the stack pointer. This code then changes
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* the "call" operand which invoked it to a "jmp" which will
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* transfer directly to the DLL function on the next invocation.
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*
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* Subsequent calls to routines whose transfer address has not been
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* determined will skip the "load the dll" step, starting at the
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* "discovery of the entry point" step.
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*
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* So, immediately following the the call to one of the above routines
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* we have:
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* DLL info (4 bytes) Pointer to a block of information concerning
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* the DLL (see below).
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* DLL args (4 bytes) The number of arguments pushed on the stack by
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* the call. If this is an odd value then this
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* is a flag that non-existence of this function
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* is not a fatal error
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* func name (n bytes) asciz string containing the name of the function
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* to be loaded.
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*
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* The DLL info block consists of the following
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* load_state (4 bytes) Pointer to a word containing the routine used
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* to eventually invoke the function. Initially
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* points to an init function which loads the
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* DLL, gets the process's load address,
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* changes the contents here to point to the
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* function address, and changes the call *(%eax)
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* to a jmp func. If the initialization has been
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* done, only the load part is done.
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* DLL handle (4 bytes) The handle to use when loading the DLL.
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* DLL locker (4 bytes) Word to use to avoid multi-thread access during
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* initialization.
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* extra init (4 bytes) Extra initialization function.
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* DLL name (n bytes) asciz string containing the name of the DLL.
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*/
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/* LoadDLLprime is used to prime the DLL info information, providing an
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additional initialization routine to call prior to calling the first
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function. */
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#define LoadDLLprime(dllname, init_also) __asm__ (" \n\
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.section ." #dllname "_info,\"w\" \n\
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.linkonce \n\
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.long std_dll_init \n\
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.long 0 \n\
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.long -1 \n\
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.long " #init_also " \n\
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.asciz \"" #dllname "\" \n\
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.text \n\
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");
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/* Create a "decorated" name */
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#define mangle(name, n) #name "@" #n
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/* Standard DLL load macro. Invokes a fatal warning if the function isn't
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found. */
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#define LoadDLLfunc(name, n, dllname) LoadDLLfuncEx (name, n, dllname, 0)
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/* Main DLL setup stuff. */
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#define LoadDLLfuncEx(name, n, dllname, notimp) \
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LoadDLLprime (dllname, dll_func_load) \
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__asm__ (" \n\
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.section ." #dllname "_text,\"wx\" \n\
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.global _" mangle (name, n) " \n\
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.global _win32_" mangle (name, n) " \n\
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.align 8 \n\
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_" mangle (name, n) ": \n\
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_win32_" mangle (name, n) ": \n\
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movl (1f),%eax \n\
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call *(%eax) \n\
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1:.long ." #dllname "_info \n\
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.long " #n "+" #notimp " \n\
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.asciz \"" #name "\" \n\
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.text \n\
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");
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/* DLL loader helper functions used during initialization. */
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/* The function which finds the address, given the name and overwrites
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the call so that future invocations go straight to the function in
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the DLL. */
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extern "C" void dll_func_load () __asm__ ("dll_func_load");
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/* Called by the primary initialization function "init_std_dll" to
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setup the stack and eliminate future calls to init_std_dll for other
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functions from this DLL. */
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extern "C" void dll_chain () __asm__ ("dll_chain");
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/* called by the secondary initialization function to call dll_func_load. */
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extern "C" void dll_chain1 () __asm__ ("dll_chain1");
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extern "C" {
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/* FIXME: This is not thread-safe? */
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__asm__ (" \n\
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msg1: \n\
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.ascii \"couldn't dynamically determine load address for '%s' (handle %p), %E\\0\"\n\
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\n\
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.align 32 \n\
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noload: \n\
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popl %edx # Get the address of the information block\n\
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movl 4(%edx),%eax # Should we 'ignore' the lack \n\
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test $1,%eax # of this function? \n\
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jz 1f # Nope. \n\
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decl %eax # Yes. This is the # of bytes + 1 \n\
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popl %edx # Caller's caller \n\
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addl %eax,%esp # Pop off bytes \n\
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movl $127,%eax # ERROR_PROC_NOT_FOUND \n\
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pushl %eax # First argument \n\
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call _SetLastError@4 # Set it \n\
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xor %eax,%eax # Zero functional return \n\
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jmp *%edx # Return \n\
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1: \n\
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movl (%edx),%eax # Handle value \n\
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pushl 4(%eax) \n\
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leal 8(%edx),%eax # Location of name of function \n\
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push %eax \n\
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push $msg1 # The message \n\
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call ___api_fatal # Print message. Never returns \n\
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\n\
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.globl dll_func_load \n\
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dll_func_load: \n\
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movl (%esp),%eax # 'Return address' contains load info \n\
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addl $8,%eax # Address of name of function to load \n\
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pushl %eax # Second argument \n\
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movl -8(%eax),%eax # Where handle lives \n\
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movl 4(%eax),%eax # Address of Handle to DLL \n\
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pushl %eax # Handle to DLL \n\
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call _GetProcAddress@8# Load it \n\
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test %eax,%eax # Success? \n\
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jne gotit # Yes \n\
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jmp noload # Issue an error or return \n\
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gotit: \n\
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popl %ecx # Pointer to 'return address' \n\
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movb $0xe9,-7(%ecx) # Turn preceding call to a jmp *%eax \n\
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movl %eax,%edx # Save \n\
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subl %ecx,%eax # Make it relative \n\
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addl $2,%eax # Tweak \n\
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movl %eax,-6(%ecx) # Move relative address after jump \n\
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jmp *%edx # Jump to actual function \n\
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\n\
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.global dll_chain \n\
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dll_chain: \n\
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pushl %eax # Restore 'return address' \n\
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movl (%eax),%eax # Get address of DLL info block \n\
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movl $dll_func_load,(%eax) # Just load func now \n\
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jmp *%edx # Jump to next init function \n\
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\n\
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dll_chain1: \n\
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pushl %eax # Restore 'return address' \n\
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jmp *%edx # Jump to next init function \n\
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");
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/* C representations of the two info blocks described above.
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FIXME: These structures confuse gdb for some reason. GDB can print
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the whole structure but has problems with the name field? */
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struct dll_info
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{
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DWORD load_state;
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HANDLE handle;
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LONG here;
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void (*init) ();
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char name[];
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};
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struct func_info
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{
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struct dll_info *dll;
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LONG decoration;
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char name[];
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};
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/* Mechanism for setting up info for passing to dll_chain routines. */
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union retchain
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{
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struct {long high; long low;};
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long long ll;
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};
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/* The standard DLL initialization routine. */
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static long long std_dll_init () __asm__ ("std_dll_init") __attribute__ ((unused));
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static long long
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std_dll_init ()
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{
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HANDLE h;
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struct func_info *func = (struct func_info *) __builtin_return_address (0);
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struct dll_info *dll = func->dll;
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retchain ret;
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if (InterlockedIncrement (&dll->here))
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do
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{
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InterlockedDecrement (&dll->here);
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Sleep (0);
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}
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while (InterlockedIncrement (&dll->here));
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else if (!dll->handle)
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{
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if ((h = LoadLibrary (dll->name)) != NULL)
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dll->handle = h;
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else if (!(func->decoration & 1))
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api_fatal ("could not load %s, %E", dll->name);
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else
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dll->handle = INVALID_HANDLE_VALUE;
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}
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InterlockedDecrement (&dll->here);
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/* Kludge alert. Redirects the return address to dll_chain. */
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__asm__ __volatile__ (" \n\
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movl $dll_chain,4(%ebp) \n\
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");
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/* Set "arguments for dll_chain. */
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ret.low = (long) dll->init;
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ret.high = (long) func;
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return ret.ll;
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}
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/* Initialization function for winsock stuff. */
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static long long wsock_init () __asm__ ("wsock_init") __attribute__ ((unused, regparm(1)));
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bool NO_COPY wsock_started = 0;
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static long long
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wsock_init ()
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{
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static LONG NO_COPY here = -1L;
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extern WSADATA wsadata;
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struct func_info *func = (struct func_info *) __builtin_return_address (0);
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struct dll_info *dll = func->dll;
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retchain ret;
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__asm__ (" \n\
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.section .ws2_32_info \n\
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.equ _ws2_32_handle,.ws2_32_info + 4 \n\
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.global _ws2_32_handle \n\
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.section .wsock32_info \n\
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.equ _wsock32_handle,.wsock32_info + 4 \n\
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.global _wsock32_handle \n\
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.text \n\
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");
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while (InterlockedIncrement (&here))
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{
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InterlockedDecrement (&here);
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Sleep (0);
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}
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if (!wsock_started && (wsock32_handle || ws2_32_handle))
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{
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/* Don't use autoload to load WSAStartup to eliminate recursion. */
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int (*wsastartup) (int, WSADATA *);
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wsastartup = (int (*)(int, WSADATA *))
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GetProcAddress ((HMODULE) (dll->handle), "WSAStartup");
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if (wsastartup)
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{
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int res = wsastartup ((2<<8) | 2, &wsadata);
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debug_printf ("res %d", res);
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debug_printf ("wVersion %d", wsadata.wVersion);
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debug_printf ("wHighVersion %d", wsadata.wHighVersion);
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debug_printf ("szDescription %s", wsadata.szDescription);
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debug_printf ("szSystemStatus %s", wsadata.szSystemStatus);
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debug_printf ("iMaxSockets %d", wsadata.iMaxSockets);
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debug_printf ("iMaxUdpDg %d", wsadata.iMaxUdpDg);
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debug_printf ("lpVendorInfo %d", wsadata.lpVendorInfo);
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wsock_started = 1;
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}
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}
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InterlockedDecrement (&here);
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/* Kludge alert. Redirects the return address to dll_chain1. */
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__asm__ __volatile__ (" \n\
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movl $dll_chain1,4(%ebp) \n\
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");
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/* Set "arguments for dll_chain1. */
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ret.low = (long) dll_func_load;
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ret.high = (long) func;
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return ret.ll;
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}
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LoadDLLprime (wsock32, wsock_init)
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LoadDLLprime (ws2_32, wsock_init)
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LoadDLLfunc (AddAccessAllowedAce, 16, advapi32)
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LoadDLLfunc (AddAccessDeniedAce, 16, advapi32)
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LoadDLLfunc (AddAce, 20, advapi32)
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LoadDLLfunc (AdjustTokenPrivileges, 24, advapi32)
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LoadDLLfuncEx (AllocateLocallyUniqueId, 4, advapi32, 1)
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LoadDLLfunc (CopySid, 12, advapi32)
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LoadDLLfunc (CreateProcessAsUserA, 44, advapi32)
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LoadDLLfuncEx (CryptAcquireContextA, 20, advapi32, 1)
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LoadDLLfuncEx (CryptGenRandom, 12, advapi32, 1)
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LoadDLLfuncEx (CryptReleaseContext, 8, advapi32, 1)
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LoadDLLfunc (DeregisterEventSource, 4, advapi32)
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LoadDLLfuncEx (DuplicateTokenEx, 24, advapi32, 1)
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LoadDLLfunc (EqualSid, 8, advapi32)
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LoadDLLfunc (GetAce, 12, advapi32)
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LoadDLLfunc (GetFileSecurityA, 20, advapi32)
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LoadDLLfunc (GetLengthSid, 4, advapi32)
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LoadDLLfunc (GetSecurityDescriptorDacl, 16, advapi32)
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LoadDLLfunc (GetSecurityDescriptorGroup, 12, advapi32)
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LoadDLLfunc (GetSecurityDescriptorOwner, 12, advapi32)
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LoadDLLfunc (GetSidIdentifierAuthority, 4, advapi32)
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LoadDLLfunc (GetSidSubAuthority, 8, advapi32)
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LoadDLLfunc (GetSidSubAuthorityCount, 4, advapi32)
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LoadDLLfunc (GetTokenInformation, 20, advapi32)
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LoadDLLfunc (GetUserNameA, 8, advapi32)
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LoadDLLfunc (ImpersonateLoggedOnUser, 4, advapi32)
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LoadDLLfunc (InitializeAcl, 12, advapi32)
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LoadDLLfunc (InitializeSecurityDescriptor, 8, advapi32)
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LoadDLLfunc (InitializeSid, 12, advapi32)
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LoadDLLfunc (IsValidSid, 4, advapi32)
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LoadDLLfunc (LogonUserA, 24, advapi32)
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LoadDLLfunc (LookupAccountNameA, 28, advapi32)
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LoadDLLfunc (LookupAccountNameW, 28, advapi32)
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LoadDLLfunc (LookupAccountSidA, 28, advapi32)
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LoadDLLfunc (LookupPrivilegeValueA, 12, advapi32)
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LoadDLLfunc (LsaClose, 4, advapi32)
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LoadDLLfunc (LsaEnumerateAccountRights, 16, advapi32)
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LoadDLLfunc (LsaFreeMemory, 4, advapi32)
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LoadDLLfunc (LsaNtStatusToWinError, 4, advapi32)
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LoadDLLfunc (LsaOpenPolicy, 16, advapi32)
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LoadDLLfunc (LsaQueryInformationPolicy, 12, advapi32)
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LoadDLLfunc (MakeSelfRelativeSD, 12, advapi32)
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LoadDLLfunc (OpenProcessToken, 12, advapi32)
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LoadDLLfunc (RegCloseKey, 4, advapi32)
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LoadDLLfunc (RegCreateKeyExA, 36, advapi32)
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LoadDLLfunc (RegDeleteKeyA, 8, advapi32)
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LoadDLLfunc (RegDeleteValueA, 8, advapi32)
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LoadDLLfunc (RegLoadKeyA, 12, advapi32)
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LoadDLLfunc (RegEnumKeyExA, 32, advapi32)
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LoadDLLfunc (RegEnumValueA, 32, advapi32)
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LoadDLLfunc (RegOpenKeyExA, 20, advapi32)
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LoadDLLfunc (RegQueryValueExA, 24, advapi32)
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LoadDLLfunc (RegSetValueExA, 24, advapi32)
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LoadDLLfunc (RegisterEventSourceA, 8, advapi32)
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LoadDLLfunc (ReportEventA, 36, advapi32)
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LoadDLLfunc (RevertToSelf, 0, advapi32)
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LoadDLLfunc (SetKernelObjectSecurity, 12, advapi32)
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LoadDLLfunc (SetSecurityDescriptorControl, 12, advapi32)
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LoadDLLfunc (SetSecurityDescriptorDacl, 16, advapi32)
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LoadDLLfunc (SetSecurityDescriptorGroup, 12, advapi32)
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LoadDLLfunc (SetSecurityDescriptorOwner, 12, advapi32)
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LoadDLLfunc (SetTokenInformation, 16, advapi32)
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LoadDLLfunc (NetApiBufferFree, 4, netapi32)
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LoadDLLfunc (NetLocalGroupEnum, 28, netapi32)
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LoadDLLfunc (NetLocalGroupGetMembers, 32, netapi32)
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LoadDLLfunc (NetServerEnum, 36, netapi32)
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LoadDLLfunc (NetUserGetGroups, 28, netapi32)
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LoadDLLfunc (NetUserGetInfo, 16, netapi32)
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LoadDLLfunc (NetWkstaUserGetInfo, 12, netapi32)
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LoadDLLfuncEx (NtCreateToken, 52, ntdll, 1)
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LoadDLLfuncEx (NtMapViewOfSection, 40, ntdll, 1)
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LoadDLLfuncEx (NtOpenSection, 12, ntdll, 1)
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LoadDLLfuncEx (NtQuerySystemInformation, 16, ntdll, 1)
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LoadDLLfuncEx (NtUnmapViewOfSection, 8, ntdll, 1)
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LoadDLLfuncEx (RtlInitUnicodeString, 8, ntdll, 1)
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LoadDLLfuncEx (RtlNtStatusToDosError, 4, ntdll, 1)
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LoadDLLfuncEx (ZwQuerySystemInformation, 16, ntdll, 1)
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LoadDLLfuncEx (LsaDeregisterLogonProcess, 4, secur32, 1)
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LoadDLLfuncEx (LsaFreeReturnBuffer, 4, secur32, 1)
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LoadDLLfuncEx (LsaLogonUser, 56, secur32, 1)
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LoadDLLfuncEx (LsaLookupAuthenticationPackage, 12, secur32, 1)
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LoadDLLfuncEx (LsaRegisterLogonProcess, 12, secur32, 1)
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LoadDLLfunc (CharToOemA, 8, user32)
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LoadDLLfunc (CharToOemBuffA, 12, user32)
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LoadDLLfunc (CloseClipboard, 0, user32)
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LoadDLLfunc (CreateWindowExA, 48, user32)
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LoadDLLfunc (DefWindowProcA, 16, user32)
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LoadDLLfunc (DispatchMessageA, 4, user32)
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LoadDLLfunc (EmptyClipboard, 0, user32)
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LoadDLLfunc (FindWindowA, 8, user32)
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LoadDLLfunc (GetClipboardData, 4, user32)
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LoadDLLfunc (GetKeyboardLayout, 4, user32)
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LoadDLLfunc (GetMessageA, 16, user32)
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LoadDLLfunc (GetPriorityClipboardFormat, 8, user32)
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LoadDLLfunc (GetProcessWindowStation, 0, user32)
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LoadDLLfunc (GetThreadDesktop, 4, user32)
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LoadDLLfunc (GetUserObjectInformationA, 20, user32)
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LoadDLLfunc (KillTimer, 8, user32)
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LoadDLLfunc (MessageBoxA, 16, user32)
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LoadDLLfunc (MsgWaitForMultipleObjects, 20, user32)
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LoadDLLfunc (OemToCharBuffA, 12, user32)
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LoadDLLfunc (OpenClipboard, 4, user32)
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LoadDLLfunc (PeekMessageA, 20, user32)
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LoadDLLfunc (PostMessageA, 16, user32)
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LoadDLLfunc (PostQuitMessage, 4, user32)
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LoadDLLfunc (RegisterClassA, 4, user32)
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LoadDLLfunc (RegisterClipboardFormatA, 4, user32)
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LoadDLLfunc (SendMessageA, 16, user32)
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LoadDLLfunc (SetClipboardData, 8, user32)
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LoadDLLfunc (SetTimer, 16, user32)
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LoadDLLfunc (SetUserObjectSecurity, 12, user32)
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LoadDLLfunc (WSAAsyncSelect, 16, wsock32)
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LoadDLLfunc (WSACleanup, 0, wsock32)
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LoadDLLfunc (WSAGetLastError, 0, wsock32)
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LoadDLLfunc (WSASetLastError, 4, wsock32)
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LoadDLLfunc (WSAStartup, 8, wsock32)
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LoadDLLfunc (__WSAFDIsSet, 8, wsock32)
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LoadDLLfunc (accept, 12, wsock32)
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LoadDLLfunc (bind, 12, wsock32)
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LoadDLLfunc (closesocket, 4, wsock32)
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LoadDLLfunc (connect, 12, wsock32)
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LoadDLLfunc (gethostbyaddr, 12, wsock32)
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LoadDLLfunc (gethostbyname, 4, wsock32)
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LoadDLLfunc (gethostname, 8, wsock32)
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LoadDLLfunc (getpeername, 12, wsock32)
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LoadDLLfunc (getprotobyname, 4, wsock32)
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LoadDLLfunc (getprotobynumber, 4, wsock32)
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LoadDLLfunc (getservbyname, 8, wsock32)
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LoadDLLfunc (getservbyport, 8, wsock32)
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LoadDLLfunc (getsockname, 12, wsock32)
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LoadDLLfunc (getsockopt, 20, wsock32)
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LoadDLLfunc (inet_addr, 4, wsock32)
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LoadDLLfunc (inet_network, 4, wsock32)
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LoadDLLfunc (inet_ntoa, 4, wsock32)
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LoadDLLfunc (ioctlsocket, 12, wsock32)
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LoadDLLfunc (listen, 8, wsock32)
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LoadDLLfunc (rcmd, 24, wsock32)
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LoadDLLfunc (recv, 16, wsock32)
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LoadDLLfunc (recvfrom, 24, wsock32)
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LoadDLLfunc (rexec, 24, wsock32)
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LoadDLLfunc (rresvport, 4, wsock32)
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LoadDLLfunc (select, 20, wsock32)
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LoadDLLfunc (send, 16, wsock32)
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LoadDLLfunc (sendto, 24, wsock32)
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LoadDLLfunc (setsockopt, 20, wsock32)
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LoadDLLfunc (shutdown, 8, wsock32)
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LoadDLLfunc (socket, 12, wsock32)
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LoadDLLfuncEx (WSACloseEvent, 4, ws2_32, 1)
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LoadDLLfuncEx (WSACreateEvent, 0, ws2_32, 1)
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LoadDLLfuncEx (WSADuplicateSocketA, 12, ws2_32, 1)
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LoadDLLfuncEx (WSAGetOverlappedResult, 20, ws2_32, 1)
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LoadDLLfuncEx (WSARecv, 28, ws2_32, 1)
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LoadDLLfuncEx (WSARecvFrom, 36, ws2_32, 1)
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LoadDLLfuncEx (WSASend, 28, ws2_32, 1)
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LoadDLLfuncEx (WSASendTo, 36, ws2_32, 1)
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LoadDLLfuncEx (WSASetEvent, 4, ws2_32, 1)
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LoadDLLfuncEx (WSASocketA, 24, ws2_32, 1)
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LoadDLLfuncEx (WSAWaitForMultipleEvents, 20, ws2_32, 1)
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LoadDLLfuncEx (GetIfTable, 12, iphlpapi, 1)
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LoadDLLfuncEx (GetIpAddrTable, 12, iphlpapi, 1)
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LoadDLLfunc (CoInitialize, 4, ole32)
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LoadDLLfunc (CoUninitialize, 0, ole32)
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LoadDLLfunc (CoCreateInstance, 20, ole32)
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LoadDLLfuncEx (SignalObjectAndWait, 16, kernel32, 1)
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LoadDLLfuncEx (CancelIo, 4, kernel32, 1)
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LoadDLLfuncEx (Process32First, 8, kernel32, 1)
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LoadDLLfuncEx (Process32Next, 8, kernel32, 1)
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LoadDLLfuncEx (CreateToolhelp32Snapshot, 8, kernel32, 1)
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LoadDLLfuncEx (waveOutGetNumDevs, 0, winmm, 1)
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LoadDLLfuncEx (waveOutOpen, 24, winmm, 1)
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LoadDLLfuncEx (waveOutReset, 4, winmm, 1)
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LoadDLLfuncEx (waveOutClose, 4, winmm, 1)
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LoadDLLfuncEx (waveOutGetVolume, 8, winmm, 1)
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LoadDLLfuncEx (waveOutSetVolume, 8, winmm, 1)
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LoadDLLfuncEx (waveOutUnprepareHeader, 12, winmm, 1)
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LoadDLLfuncEx (waveOutPrepareHeader, 12, winmm, 1)
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LoadDLLfuncEx (waveOutWrite, 12, winmm, 1)
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}
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