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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "webkit/glue/plugins/plugin_lib.h"
#include <dlfcn.h>
#if defined(OS_OPENBSD)
#include <sys/exec_elf.h>
#else
#include <elf.h>
#endif
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#include "base/utf_string_conversions.h"
#include "webkit/glue/plugins/plugin_list.h"
// These headers must be included in this order to make the declaration gods
// happy.
#include "base/third_party/nspr/prcpucfg_linux.h"
namespace {
// Copied from nsplugindefs.h instead of including the file since it has a bunch
// of dependencies.
enum nsPluginVariable {
nsPluginVariable_NameString = 1,
nsPluginVariable_DescriptionString = 2
};
// Read the ELF header and return true if it is usable on
// the current architecture (e.g. 32-bit ELF on 32-bit build).
// Returns false on other errors as well.
bool ELFMatchesCurrentArchitecture(const FilePath& filename) {
FILE* file = fopen(filename.value().c_str(), "rb");
if (!file)
return false;
char buffer[5];
if (fread(buffer, 5, 1, file) != 1) {
fclose(file);
return false;
}
fclose(file);
if (buffer[0] != ELFMAG0 ||
buffer[1] != ELFMAG1 ||
buffer[2] != ELFMAG2 ||
buffer[3] != ELFMAG3) {
// Not an ELF file, perhaps?
return false;
}
int elf_class = buffer[EI_CLASS];
#if defined(ARCH_CPU_32_BITS)
if (elf_class == ELFCLASS32)
return true;
#elif defined(ARCH_CPU_64_BITS)
if (elf_class == ELFCLASS64)
return true;
#endif
return false;
}
} // anonymous namespace
namespace NPAPI {
bool PluginLib::ReadWebPluginInfo(const FilePath& filename,
WebPluginInfo* info) {
// The file to reference is:
// http://mxr.mozilla.org/firefox/source/modules/plugin/base/src/nsPluginsDirUnix.cpp
// Skip files that aren't appropriate for our architecture.
if (!ELFMatchesCurrentArchitecture(filename))
return false;
void* dl = base::LoadNativeLibrary(filename);
if (!dl)
return false;
info->path = filename;
// See comments in plugin_lib_mac regarding this symbol.
typedef const char* (*NP_GetMimeDescriptionType)();
NP_GetMimeDescriptionType NP_GetMIMEDescription =
reinterpret_cast<NP_GetMimeDescriptionType>(
dlsym(dl, "NP_GetMIMEDescription"));
const char* mime_description = NULL;
if (NP_GetMIMEDescription)
mime_description = NP_GetMIMEDescription();
if (mime_description)
ParseMIMEDescription(mime_description, &info->mime_types);
// The plugin name and description live behind NP_GetValue calls.
typedef NPError (*NP_GetValueType)(void* unused,
nsPluginVariable variable,
void* value_out);
NP_GetValueType NP_GetValue =
reinterpret_cast<NP_GetValueType>(dlsym(dl, "NP_GetValue"));
if (NP_GetValue) {
const char* name = NULL;
NP_GetValue(NULL, nsPluginVariable_NameString, &name);
if (name)
info->name = UTF8ToWide(name);
const char* description = NULL;
NP_GetValue(NULL, nsPluginVariable_DescriptionString, &description);
if (description)
info->desc = UTF8ToWide(description);
}
// Intentionally not unloading the plugin here, it can lead to crashes.
return true;
}
// static
void PluginLib::ParseMIMEDescription(
const std::string& description,
std::vector<WebPluginMimeType>* mime_types) {
// We parse the description here into WebPluginMimeType structures.
// Naively from the NPAPI docs you'd think you could use
// string-splitting, but the Firefox parser turns out to do something
// different: find the first colon, then the second, then a semi.
//
// See ParsePluginMimeDescription near
// http://mxr.mozilla.org/firefox/source/modules/plugin/base/src/nsPluginsDirUtils.h#53
std::string::size_type ofs = 0;
for (;;) {
WebPluginMimeType mime_type;
std::string::size_type end = description.find(':', ofs);
if (end == std::string::npos)
break;
mime_type.mime_type = description.substr(ofs, end - ofs);
ofs = end + 1;
end = description.find(':', ofs);
if (end == std::string::npos)
break;
const std::string extensions = description.substr(ofs, end - ofs);
SplitString(extensions, ',', &mime_type.file_extensions);
ofs = end + 1;
end = description.find(';', ofs);
// It's ok for end to run off the string here. If there's no
// trailing semicolon we consume the remainder of the string.
if (end != std::string::npos) {
mime_type.description = UTF8ToWide(description.substr(ofs, end - ofs));
} else {
mime_type.description = UTF8ToWide(description.substr(ofs));
}
mime_types->push_back(mime_type);
if (end == std::string::npos)
break;
ofs = end + 1;
}
}
} // namespace NPAPI
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