99 lines
2.0 KiB
C++
99 lines
2.0 KiB
C++
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#include <std_include.hpp>
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#include "interface.hpp"
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#include <utils/memory.hpp>
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#include <utils/nt.hpp>
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namespace steam
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{
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interface::interface() : interface(nullptr)
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{
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}
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interface::interface(void* interface_ptr) : interface_ptr_(static_cast<void***>(interface_ptr))
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{
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}
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interface::operator bool() const
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{
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return this->interface_ptr_ != nullptr;
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}
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void* interface::find_method(const std::string& name)
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{
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const auto method_entry = this->methods_.find(name);
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if (method_entry != this->methods_.end())
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{
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return method_entry->second;
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}
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return this->search_method(name);
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}
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void* interface::search_method(const std::string& name)
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{
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if (!utils::memory::is_bad_read_ptr(this->interface_ptr_))
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{
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auto vftbl = *this->interface_ptr_;
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while (!utils::memory::is_bad_read_ptr(vftbl) && !utils::memory::is_bad_code_ptr(*vftbl))
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{
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const auto ptr = *vftbl;
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const auto result = this->analyze_method(ptr);
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if (!result.empty())
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{
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this->methods_[result] = ptr;
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if (result == name)
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{
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return ptr;
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}
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}
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++vftbl;
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}
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}
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return {};
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}
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std::string interface::analyze_method(const void* method_ptr)
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{
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if (utils::memory::is_bad_code_ptr(method_ptr)) return {};
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ud_t ud;
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ud_init(&ud);
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ud_set_mode(&ud, 64);
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ud_set_pc(&ud, uint64_t(method_ptr));
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ud_set_input_buffer(&ud, static_cast<const uint8_t*>(method_ptr), INT32_MAX);
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while (true)
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{
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ud_disassemble(&ud);
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if (ud_insn_mnemonic(&ud) == UD_Iret)
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{
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break;
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}
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if (ud_insn_mnemonic(&ud) == UD_Ilea)
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{
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const auto* operand = ud_insn_opr(&ud, 1);
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if (operand && operand->type == UD_OP_MEM && operand->base == UD_R_RIP)
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{
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auto* operand_ptr = reinterpret_cast<char*>(ud_insn_len(&ud) + ud_insn_off(&ud) + operand->lval.
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sdword);
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if (!utils::memory::is_bad_read_ptr(operand_ptr) && utils::memory::is_rdata_ptr(operand_ptr))
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{
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return operand_ptr;
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}
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}
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}
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if (*reinterpret_cast<unsigned char*>(ud.pc) == 0xCC) break; // int 3
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}
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return {};
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}
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}
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