476 lines
16 KiB
C++
476 lines
16 KiB
C++
/* autoload.cc: all dynamic load stuff.
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Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
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2009, 2010 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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#include "miscfuncs.h"
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#include "fenv.h"
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#define USE_SYS_TYPES_FD_SET
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#include <winsock2.h>
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bool NO_COPY wsock_started;
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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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.ifndef " #dllname "_primed \n\
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.section .data_cygwin_nocopy,\"w\" \n\
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.align 4 \n\
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."#dllname "_info: \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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.string16 \"" #dllname ".dll\" \n\
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.text \n\
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.set " #dllname "_primed, 1 \n\
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.endif \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. May invoke a fatal error if the function isn't
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found. */
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#define LoadDLLfunc(name, n, dllname) \
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LoadDLLfuncEx (name, n, dllname, 0)
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#define LoadDLLfuncEx(name, n, dllname, notimp) \
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LoadDLLfuncEx2(name, n, dllname, notimp, 0)
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#define LoadDLLfuncEx2(name, n, dllname, notimp, err) \
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LoadDLLfuncEx3(name, n, dllname, notimp, err, 0)
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/* Main DLL setup stuff. */
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#define LoadDLLfuncEx3(name, n, dllname, notimp, err, fn) \
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LoadDLLprime (dllname, dll_func_load) \
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__asm__ (" \n\
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.section ." #dllname "_autoload_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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.byte 0xe9 \n\
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.long -4 + 1f - . \n\
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1:movl (2f),%eax \n\
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call *(%eax) \n\
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2:.long ." #dllname "_info \n\
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.long (" #n "+" #notimp ") | (((" #err ") & 0xff) <<16) | (((" #fn ") & 0xff) << 24) \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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extern "C" {
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__asm__ (" \n\
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.text \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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andl $0xffff0000,%eax# upper word \n\
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subl %eax,%esp # adjust for possible return value \n\
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pushl %eax # Save for later \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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popl %eax # Get back argument \n\
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sarl $16,%eax # return value in high order word \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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pushl %eax \n\
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pushl $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 %edx # Pointer to 'return address' \n\
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subl %edx,%eax # Make it relative \n\
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addl $7,%eax # Tweak \n\
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subl $12,%edx # Point to jmp \n\
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movl %eax,1(%edx) # 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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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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WCHAR 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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__attribute__ ((used, noinline)) static long long
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std_dll_init ()
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{
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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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yield ();
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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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HANDLE h;
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fenv_t fpuenv;
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fegetenv (&fpuenv);
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WCHAR dll_path[MAX_PATH];
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/* http://www.microsoft.com/technet/security/advisory/2269637.mspx */
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wcpcpy (wcpcpy (dll_path, windows_system_directory), dll->name);
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dll->handle = NULL;
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/* MSDN seems to imply that LoadLibrary can fail mysteriously, so,
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since there have been reports of this in the mailing list, retry
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several times before giving up. */
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for (int i = 1; !dll->handle && i <= 5; i++)
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if ((h = LoadLibraryW (dll_path)) != NULL)
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dll->handle = h;
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/* FIXME: This isn't quite right. Probably should check for specific
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error codes. */
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else if ((func->decoration & 1))
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dll->handle = INVALID_HANDLE_VALUE;
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else if (i < 5)
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yield ();
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else
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api_fatal ("could not load %W, %E", dll_path);
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fesetenv (&fpuenv);
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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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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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return ret.ll;
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}
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/* Initialization function for winsock stuff. */
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WSADATA NO_COPY wsadata;
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__attribute__ ((used, noinline, regparm(1))) 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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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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while (InterlockedIncrement (&here))
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{
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InterlockedDecrement (&here);
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yield ();
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}
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if (!wsock_started)
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{
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int (*wsastartup) (int, WSADATA *);
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/* Don't use autoload to load WSAStartup to eliminate recursion. */
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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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/* 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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InterlockedDecrement (&here);
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volatile retchain ret;
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/* Set "arguments for dll_chain. */
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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 (ws2_32, _wsock_init)
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LoadDLLfuncEx2 (DnsQuery_A, 24, dnsapi, 1, 127) // ERROR_PROC_NOT_FOUND
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LoadDLLfuncEx (DnsRecordListFree, 8, dnsapi, 1)
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// 50 = ERROR_NOT_SUPPORTED. Returned if OS doesn't support iphlpapi funcs
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LoadDLLfuncEx2 (GetAdaptersAddresses, 20, iphlpapi, 1, 50)
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LoadDLLfuncEx2 (GetExtendedTcpTable, 24, iphlpapi, 1, 50)
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LoadDLLfunc (GetIfEntry, 4, iphlpapi)
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LoadDLLfunc (GetIpAddrTable, 12, iphlpapi)
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LoadDLLfunc (GetIpForwardTable, 12, iphlpapi)
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LoadDLLfunc (GetNetworkParams, 8, iphlpapi)
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LoadDLLfunc (GetTcpTable, 12, iphlpapi)
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LoadDLLfunc (SendARP, 16, iphlpapi)
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LoadDLLfuncEx (AttachConsole, 4, kernel32, 1)
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LoadDLLfunc (FindFirstVolumeA, 8, kernel32)
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LoadDLLfunc (FindNextVolumeA, 12, kernel32)
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LoadDLLfunc (FindVolumeClose, 4, kernel32)
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LoadDLLfunc (GetConsoleWindow, 0, kernel32)
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LoadDLLfuncEx (GetNamedPipeClientProcessId, 8, kernel32, 1)
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LoadDLLfuncEx (GetSystemWindowsDirectoryW, 8, kernel32, 1)
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LoadDLLfunc (GetVolumeNameForVolumeMountPointA, 12, kernel32)
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LoadDLLfunc (LocaleNameToLCID, 8, kernel32)
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LoadDLLfunc (WNetCloseEnum, 4, mpr)
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LoadDLLfunc (WNetEnumResourceA, 16, mpr)
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LoadDLLfunc (WNetGetProviderNameA, 12, mpr)
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LoadDLLfunc (WNetGetResourceInformationA, 16, mpr)
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LoadDLLfunc (WNetOpenEnumA, 20, mpr)
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/* 127 == ERROR_PROC_NOT_FOUND */
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LoadDLLfuncEx2 (DsGetDcNameW, 24, netapi32, 1, 127)
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LoadDLLfunc (NetApiBufferFree, 4, netapi32)
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LoadDLLfunc (NetGetAnyDCName, 12, netapi32)
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LoadDLLfunc (NetGetDCName, 12, netapi32)
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LoadDLLfunc (NetUserGetGroups, 28, netapi32)
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LoadDLLfunc (NetUserGetInfo, 16, netapi32)
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LoadDLLfunc (NetUserGetLocalGroups, 32, netapi32)
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/* 0xc000007a == STATUS_PROCEDURE_NOT_FOUND */
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#define LoadDLLfuncNt(name, n, dllname) \
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LoadDLLfuncEx2(name, n, dllname, 1, 0xc000007a)
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LoadDLLfuncNt (NtCommitTransaction, 8, ntdll)
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LoadDLLfuncNt (NtCreateTransaction, 40, ntdll)
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LoadDLLfuncNt (NtRollbackTransaction, 8, ntdll)
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LoadDLLfuncNt (RtlGetCurrentTransaction, 0, ntdll)
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LoadDLLfuncNt (RtlSetCurrentTransaction, 4, ntdll)
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LoadDLLfunc (CoTaskMemFree, 4, ole32)
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LoadDLLfuncEx (EnumProcessModules, 16, psapi, 1)
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LoadDLLfuncEx (GetModuleFileNameExW, 16, psapi, 1)
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LoadDLLfuncEx (GetModuleInformation, 16, psapi, 1)
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LoadDLLfuncEx (GetProcessMemoryInfo, 12, psapi, 1)
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LoadDLLfuncEx (QueryWorkingSet, 12, psapi, 1)
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LoadDLLfunc (UuidCreate, 4, rpcrt4)
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LoadDLLfuncEx (UuidCreateSequential, 4, rpcrt4, 1)
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/* secur32 functions return NTSTATUS values. */
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LoadDLLfuncNt (LsaDeregisterLogonProcess, 4, secur32)
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LoadDLLfuncNt (LsaFreeReturnBuffer, 4, secur32)
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LoadDLLfuncNt (LsaLogonUser, 56, secur32)
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LoadDLLfuncNt (LsaLookupAuthenticationPackage, 12, secur32)
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LoadDLLfuncNt (LsaRegisterLogonProcess, 12, secur32)
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LoadDLLfunc (SHGetDesktopFolder, 4, shell32)
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LoadDLLfunc (CharNextExA, 12, user32)
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LoadDLLfunc (CloseClipboard, 0, user32)
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LoadDLLfunc (CloseDesktop, 4, user32)
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LoadDLLfunc (CloseWindowStation, 4, user32)
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LoadDLLfunc (CreateDesktopW, 24, user32)
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LoadDLLfunc (CreateWindowExA, 48, user32)
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LoadDLLfunc (CreateWindowStationW, 16, 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 (GetForegroundWindow, 0, 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 (GetUserObjectInformationW, 20, user32)
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LoadDLLfunc (GetWindowThreadProcessId, 8, user32)
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LoadDLLfunc (MessageBeep, 4, user32)
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LoadDLLfunc (MessageBoxA, 16, user32)
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LoadDLLfunc (MsgWaitForMultipleObjectsEx, 20, 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 (SetParent, 8, user32)
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LoadDLLfunc (SetProcessWindowStation, 4, user32)
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LoadDLLfunc (SetThreadDesktop, 4, user32)
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LoadDLLfunc (ShowWindowAsync, 8, user32)
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LoadDLLfunc (timeBeginPeriod, 4, winmm)
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LoadDLLfunc (timeEndPeriod, 4, winmm)
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LoadDLLfunc (timeGetDevCaps, 8, winmm)
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LoadDLLfunc (timeGetTime, 0, winmm)
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LoadDLLfunc (waveInAddBuffer, 12, winmm)
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LoadDLLfunc (waveInClose, 4, winmm)
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LoadDLLfunc (waveInGetNumDevs, 0, winmm)
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LoadDLLfunc (waveInOpen, 24, winmm)
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LoadDLLfunc (waveInPrepareHeader, 12, winmm)
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LoadDLLfunc (waveInReset, 4, winmm)
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LoadDLLfunc (waveInStart, 4, winmm)
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LoadDLLfunc (waveInUnprepareHeader, 12, winmm)
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LoadDLLfunc (waveOutClose, 4, winmm)
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LoadDLLfunc (waveOutGetNumDevs, 0, winmm)
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LoadDLLfunc (waveOutGetVolume, 8, winmm)
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LoadDLLfunc (waveOutOpen, 24, winmm)
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LoadDLLfunc (waveOutPrepareHeader, 12, winmm)
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LoadDLLfunc (waveOutReset, 4, winmm)
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LoadDLLfunc (waveOutSetVolume, 8, winmm)
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LoadDLLfunc (waveOutUnprepareHeader, 12, winmm)
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LoadDLLfunc (waveOutWrite, 12, winmm)
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LoadDLLfunc (accept, 12, ws2_32)
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LoadDLLfunc (bind, 12, ws2_32)
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LoadDLLfunc (closesocket, 4, ws2_32)
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LoadDLLfunc (connect, 12, ws2_32)
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LoadDLLfunc (gethostbyaddr, 12, ws2_32)
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LoadDLLfunc (gethostbyname, 4, ws2_32)
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LoadDLLfunc (gethostname, 8, ws2_32)
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LoadDLLfunc (getpeername, 12, ws2_32)
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LoadDLLfunc (getprotobyname, 4, ws2_32)
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LoadDLLfunc (getprotobynumber, 4, ws2_32)
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LoadDLLfunc (getservbyname, 8, ws2_32)
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LoadDLLfunc (getservbyport, 8, ws2_32)
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LoadDLLfunc (getsockname, 12, ws2_32)
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LoadDLLfunc (getsockopt, 20, ws2_32)
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LoadDLLfunc (ioctlsocket, 12, ws2_32)
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LoadDLLfunc (listen, 8, ws2_32)
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LoadDLLfunc (setsockopt, 20, ws2_32)
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LoadDLLfunc (shutdown, 8, ws2_32)
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LoadDLLfunc (socket, 12, ws2_32)
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LoadDLLfunc (WSAAsyncSelect, 16, ws2_32)
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LoadDLLfunc (WSADuplicateSocketW, 12, ws2_32)
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LoadDLLfunc (WSAEnumNetworkEvents, 12, ws2_32)
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LoadDLLfunc (WSAEventSelect, 12, ws2_32)
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LoadDLLfunc (WSAGetLastError, 0, ws2_32)
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LoadDLLfunc (WSAIoctl, 36, ws2_32)
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LoadDLLfunc (WSARecv, 28, ws2_32)
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LoadDLLfunc (WSARecvFrom, 36, ws2_32)
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LoadDLLfunc (WSASendMsg, 24, ws2_32)
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LoadDLLfunc (WSASendTo, 36, ws2_32)
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LoadDLLfunc (WSASetLastError, 4, ws2_32)
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LoadDLLfunc (WSASocketW, 24, ws2_32)
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// LoadDLLfunc (WSAStartup, 8, ws2_32)
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LoadDLLfunc (WSAWaitForMultipleEvents, 20, ws2_32)
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}
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