275 lines
8.7 KiB
C++
275 lines
8.7 KiB
C++
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/*
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Copyright (C) 2001-present by Serge Lamikhov-Center
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifndef ELFIO_DYNAMIC_HPP
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#define ELFIO_DYNAMIC_HPP
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#include <algorithm>
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namespace ELFIO {
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//------------------------------------------------------------------------------
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template <class S> class dynamic_section_accessor_template
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{
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public:
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//------------------------------------------------------------------------------
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explicit dynamic_section_accessor_template( const elfio& elf_file,
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S* section )
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: elf_file( elf_file ), dynamic_section( section ), entries_num( 0 )
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{
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}
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//------------------------------------------------------------------------------
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Elf_Xword get_entries_num() const
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{
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size_t needed_entry_size = -1;
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if ( elf_file.get_class() == ELFCLASS32 ) {
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needed_entry_size = sizeof( Elf32_Dyn );
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}
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else {
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needed_entry_size = sizeof( Elf64_Dyn );
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}
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if ( ( 0 == entries_num ) &&
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( 0 != dynamic_section->get_entry_size() &&
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dynamic_section->get_entry_size() >= needed_entry_size ) ) {
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entries_num =
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dynamic_section->get_size() / dynamic_section->get_entry_size();
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Elf_Xword i;
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Elf_Xword tag = DT_NULL;
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Elf_Xword value = 0;
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std::string str;
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for ( i = 0; i < entries_num; i++ ) {
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get_entry( i, tag, value, str );
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if ( tag == DT_NULL )
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break;
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}
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entries_num = std::min<Elf_Xword>( entries_num, i + 1 );
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}
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return entries_num;
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}
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//------------------------------------------------------------------------------
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bool get_entry( Elf_Xword index,
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Elf_Xword& tag,
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Elf_Xword& value,
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std::string& str ) const
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{
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if ( index >= get_entries_num() ) { // Is index valid
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return false;
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}
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if ( elf_file.get_class() == ELFCLASS32 ) {
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generic_get_entry_dyn<Elf32_Dyn>( index, tag, value );
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}
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else {
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generic_get_entry_dyn<Elf64_Dyn>( index, tag, value );
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}
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// If the tag has a string table reference - prepare the string
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if ( tag == DT_NEEDED || tag == DT_SONAME || tag == DT_RPATH ||
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tag == DT_RUNPATH ) {
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string_section_accessor strsec(
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elf_file.sections[get_string_table_index()] );
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const char* result = strsec.get_string( (Elf_Word)value );
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if ( nullptr == result ) {
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str.clear();
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return false;
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}
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str = result;
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}
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else {
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str.clear();
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}
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return true;
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}
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//------------------------------------------------------------------------------
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void add_entry( Elf_Xword tag, Elf_Xword value )
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{
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if ( elf_file.get_class() == ELFCLASS32 ) {
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generic_add_entry_dyn<Elf32_Dyn>( tag, value );
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}
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else {
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generic_add_entry_dyn<Elf64_Dyn>( tag, value );
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}
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}
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//------------------------------------------------------------------------------
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void add_entry( Elf_Xword tag, const std::string& str )
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{
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string_section_accessor strsec(
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elf_file.sections[get_string_table_index()] );
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Elf_Xword value = strsec.add_string( str );
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add_entry( tag, value );
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}
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//------------------------------------------------------------------------------
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private:
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//------------------------------------------------------------------------------
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Elf_Half get_string_table_index() const
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{
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return (Elf_Half)dynamic_section->get_link();
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}
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//------------------------------------------------------------------------------
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template <class T>
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void generic_get_entry_dyn( Elf_Xword index,
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Elf_Xword& tag,
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Elf_Xword& value ) const
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{
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const endianess_convertor& convertor = elf_file.get_convertor();
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// Check unusual case when dynamic section has no data
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if ( dynamic_section->get_data() == nullptr ||
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( index + 1 ) * dynamic_section->get_entry_size() >
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dynamic_section->get_size() ||
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dynamic_section->get_entry_size() < sizeof( T ) ) {
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tag = DT_NULL;
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value = 0;
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return;
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}
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const T* pEntry = reinterpret_cast<const T*>(
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dynamic_section->get_data() +
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index * dynamic_section->get_entry_size() );
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tag = convertor( pEntry->d_tag );
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switch ( tag ) {
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case DT_NULL:
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case DT_SYMBOLIC:
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case DT_TEXTREL:
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case DT_BIND_NOW:
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value = 0;
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break;
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case DT_NEEDED:
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case DT_PLTRELSZ:
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case DT_RELASZ:
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case DT_RELAENT:
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case DT_STRSZ:
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case DT_SYMENT:
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case DT_SONAME:
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case DT_RPATH:
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case DT_RELSZ:
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case DT_RELENT:
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case DT_PLTREL:
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case DT_INIT_ARRAYSZ:
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case DT_FINI_ARRAYSZ:
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case DT_RUNPATH:
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case DT_FLAGS:
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case DT_PREINIT_ARRAYSZ:
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value = convertor( pEntry->d_un.d_val );
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break;
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case DT_PLTGOT:
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case DT_HASH:
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case DT_STRTAB:
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case DT_SYMTAB:
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case DT_RELA:
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case DT_INIT:
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case DT_FINI:
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case DT_REL:
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case DT_DEBUG:
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case DT_JMPREL:
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case DT_INIT_ARRAY:
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case DT_FINI_ARRAY:
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case DT_PREINIT_ARRAY:
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default:
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value = convertor( pEntry->d_un.d_ptr );
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break;
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}
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}
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//------------------------------------------------------------------------------
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template <class T>
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void generic_add_entry_dyn( Elf_Xword tag, Elf_Xword value )
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{
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const endianess_convertor& convertor = elf_file.get_convertor();
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T entry;
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switch ( tag ) {
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case DT_NULL:
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case DT_SYMBOLIC:
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case DT_TEXTREL:
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case DT_BIND_NOW:
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entry.d_un.d_val = convertor( decltype( entry.d_un.d_val )( 0 ) );
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break;
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case DT_NEEDED:
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case DT_PLTRELSZ:
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case DT_RELASZ:
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case DT_RELAENT:
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case DT_STRSZ:
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case DT_SYMENT:
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case DT_SONAME:
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case DT_RPATH:
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case DT_RELSZ:
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case DT_RELENT:
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case DT_PLTREL:
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case DT_INIT_ARRAYSZ:
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case DT_FINI_ARRAYSZ:
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case DT_RUNPATH:
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case DT_FLAGS:
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case DT_PREINIT_ARRAYSZ:
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entry.d_un.d_val =
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convertor( decltype( entry.d_un.d_val )( value ) );
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break;
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case DT_PLTGOT:
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case DT_HASH:
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case DT_STRTAB:
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case DT_SYMTAB:
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case DT_RELA:
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case DT_INIT:
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case DT_FINI:
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case DT_REL:
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case DT_DEBUG:
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case DT_JMPREL:
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case DT_INIT_ARRAY:
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case DT_FINI_ARRAY:
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case DT_PREINIT_ARRAY:
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default:
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entry.d_un.d_ptr =
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convertor( decltype( entry.d_un.d_val )( value ) );
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break;
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}
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entry.d_tag = convertor( decltype( entry.d_tag )( tag ) );
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dynamic_section->append_data( reinterpret_cast<char*>( &entry ),
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sizeof( entry ) );
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}
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//------------------------------------------------------------------------------
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private:
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const elfio& elf_file;
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S* dynamic_section;
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mutable Elf_Xword entries_num;
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};
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using dynamic_section_accessor = dynamic_section_accessor_template<section>;
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using const_dynamic_section_accessor =
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dynamic_section_accessor_template<const section>;
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} // namespace ELFIO
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#endif // ELFIO_DYNAMIC_HPP
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