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// Copyright (c) 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// ms_symbol_server_converter.h: Obtain symbol files from a Microsoft
// symbol server, and convert them to Breakpad's dumped format.
//
// At runtime, MSSymbolServerConverter and code that it calls depend on being
// able to locate suitable versions of dbghelp.dll and symsrv.dll. For best
// results, place these files in the same directory as the executable.
// dbghelp.dll and symsrv.dll as supplied with Debugging Tools for Windows are
// both redistributable, as indicated by the package's redist.txt file.
//
// When connecting to Microsoft's symbol server at
// http://msdl.microsoft.com/download/symbols/, which provides access to
// symbols for the operating system itself, symsrv.dll requires agreement to
// Microsoft's "Terms of Use for Microsoft Symbols and Binaries." Because this
// library places the symbol engine into a promptless mode, the dialog with the
// terms will not appear, and use of Microsoft's symbol server will not be
// possible. To indicate agreement to the terms, create a file called
// symsrv.yes in the same directory as symsrv.dll. (Note that symsrv.dll will
// also recognize a symsrv.no file as indicating that you do not accept the
// terms; the .yes file takes priority over the .no file.) The terms of use
// are contained within symsrv.dll; they were formerly available online at
// http://www.microsoft.com/whdc/devtools/debugging/symsrvTOU2.mspx , but
// do not appear to be available online any longer as of January, 2007. It is
// possible to view the terms from within WinDbg (Debugging Tools for Windows)
// by removing any symsrv.yes and symsrv.no files from WinDbg's directory,
// setting the symbol path to include Microsoft's symbol server (.sympath), and
// attempting to load symbols from their server (.reload).
//
// This code has been tested with dbghelp.dll 6.5.3.7 and symsrv.dll 6.5.3.8,
// included with Microsoft Visual Studio 8 in Common7/IDE. This has also been
// tested with dbghelp.dll and symsrv.dll versions 6.6.7.5 and 6.12.2.633,
// included with the same versions of Debugging Tools for Windows, available at
// http://www.microsoft.com/whdc/devtools/debugging/ .
//
// Author: Mark Mentovai
#ifndef TOOLS_WINDOWS_MS_SYMBOL_SERVER_CONVERTER_H_
#define TOOLS_WINDOWS_MS_SYMBOL_SERVER_CONVERTER_H_
#include <windows.h>
#include <string>
#include <vector>
namespace google_breakpad {
using std::string;
using std::vector;
// MissingSymbolInfo contains the subset of the information in the processor's
// CodeModule structure relevant to obtaining a missing symbol file. Only
// debug_file and debug_identifier are relevant in actually obtaining the
// missing file; the other fields are for convenience.
struct MissingSymbolInfo {
string code_file;
string code_identifier;
string debug_file;
string debug_identifier;
string version;
};
class GUIDOrSignatureIdentifier {
public:
enum GUIDOrSignatureType {
TYPE_NONE = 0,
TYPE_GUID,
TYPE_SIGNATURE
};
GUIDOrSignatureIdentifier() : type_(TYPE_NONE) {}
// Converts |identifier|, a debug_identifier-formatted string, into its
// component fields: either a GUID and age, or signature and age. If
// successful, sets the relevant fields in the object, including the type
// field, and returns true. On error, returns false.
bool InitializeFromString(const string& identifier);
GUIDOrSignatureType type() const { return type_; }
GUID guid() const { return guid_; }
DWORD signature() const { return signature_; }
int age() const { return age_; }
const void* guid_or_signature_pointer() const { return &guid_; }
private:
GUIDOrSignatureType type_;
// An identifier contains either a 128-bit uuid or a 32-bit signature.
union {
GUID guid_;
DWORD signature_;
};
// All identifiers used here have age fields, which indicate a specific
// revision given a uuid or signature.
int age_;
};
class MSSymbolServerConverter {
public:
enum LocateResult {
LOCATE_FAILURE = 0,
LOCATE_NOT_FOUND, // Authoritative: the file is not present.
LOCATE_RETRY, // Transient (network?) error, try again later.
LOCATE_SUCCESS
};
// Create a new object. local_cache is the location (pathname) of a local
// symbol store used to hold downloaded and converted symbol files. This
// directory will be created by LocateSymbolFile when it successfully
// retrieves a symbol file. symbol_servers contains a list of locations (URLs
// or pathnames) of the upstream symbol server stores, given in order of
// preference, with the first string in the vector identifying the first
// store to try. The vector must contain at least one string. None of the
// strings passed to this constructor may contain asterisk ('*') or semicolon
// (';') characters, as the symbol engine uses these characters as separators.
MSSymbolServerConverter(const string& local_cache,
const vector<string>& symbol_servers);
// Locates the PE file (DLL or EXE) specified by the identifying information
// in |missing|, by checking the symbol stores identified when the object
// was created. When returning LOCATE_SUCCESS, pe_file is set to
// the pathname of the decompressed PE file as it is stored in the
// local cache.
LocateResult LocatePEFile(const MissingSymbolInfo& missing, string* pe_file);
// Locates the symbol file specified by the identifying information in
// |missing|, by checking the symbol stores identified when the object
// was created. When returning LOCATE_SUCCESS, symbol_file is set to
// the pathname of the decompressed symbol file as it is stored in the
// local cache.
LocateResult LocateSymbolFile(const MissingSymbolInfo& missing,
string* symbol_file);
// Calls LocateSymbolFile and converts the returned symbol file to the
// dumped-symbol format, storing it adjacent to the symbol file. The
// only conversion supported is from pdb files. Returns the return
// value of LocateSymbolFile, or if LocateSymbolFile succeeds but
// conversion fails, returns LOCATE_FAILURE. The pathname to the
// pdb file and to the converted symbol file are returned in
// |converted_symbol_file|, |symbol_file|, and |pe_file|. |symbol_file| and
// |pe_file| are optional and may be NULL. If only the converted symbol file
// is desired, set |keep_symbol_file| and |keep_pe_file| to false to indicate
// that the original symbol file (pdb) and executable file (exe, dll) should
// be deleted after conversion.
LocateResult LocateAndConvertSymbolFile(const MissingSymbolInfo& missing,
bool keep_symbol_file,
bool keep_pe_file,
string* converted_symbol_file,
string* symbol_file,
string* pe_file);
// Calls LocatePEFile and converts the returned PE file to the
// dumped-symbol format, storing it adjacent to the PE file. The
// only conversion supported is from PE files. Returns the return
// value of LocatePEFile, or if LocatePEFile succeeds but
// conversion fails, returns LOCATE_FAILURE. The pathname to the
// PE file and to the converted symbol file are returned in
// |converted_symbol_file| and |pe_file|. |pe_file| is optional and may be
// NULL. If only the converted symbol file is desired, set |keep_pe_file|
// to false to indicate that the executable file (exe, dll) should be deleted
// after conversion.
// NOTE: Currrently only supports x64 PEs.
LocateResult LocateAndConvertPEFile(const MissingSymbolInfo& missing,
bool keep_pe_file,
string* converted_symbol_file,
string* pe_file);
private:
// Locates the PDB or PE file (DLL or EXE) specified by the identifying
// information in |debug_or_code_file| and |debug_or_code_id|, by checking
// the symbol stores identified when the object was created. When
// returning LOCATE_SUCCESS, file_name is set to the pathname of the
// decompressed PDB or PE file file as it is stored in the local cache.
LocateResult LocateFile(const string& debug_or_code_file,
const string& debug_or_code_id,
const string& version, string* file_name);
// Called by various SymSrv functions to report status as progress is made
// and to allow the callback to influence processing. Messages sent to this
// callback can be used to distinguish between the various failure modes
// that SymFindFileInPath might encounter.
static BOOL CALLBACK SymCallback(HANDLE process, ULONG action, ULONG64 data,
ULONG64 context);
// Called by SymFindFileInPath (in LocateSymbolFile) after a candidate
// symbol file is located, when it's present in the local cache.
// SymFindFileInPath actually seems to accept NULL for a callback function
// and behave properly for our needs in that case, but the documentation
// doesn't mention it, so this little callback is provided.
static BOOL CALLBACK SymFindFileInPathCallback(const char* filename,
void* context);
// The search path used by SymSrv, built based on the arguments to the
// constructor.
string symbol_path_;
// SymCallback will set at least one of these failure variables if
// SymFindFileInPath fails for an expected reason.
bool fail_dns_; // DNS failures (fail_not_found_ will also be set).
bool fail_timeout_; // Timeouts (fail_not_found_ will also be set).
bool fail_not_found_; // The file could not be found. If this is the only
// fail_* member set, then it is authoritative.
};
} // namespace google_breakpad
#endif // TOOLS_WINDOWS_MS_SYMBOL_SERVER_CONVERTER_H_