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46 lines
1.7 KiB
46 lines
1.7 KiB
4 years ago
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#include <elf.h>
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#include <cstdint>
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#include <dlfcn.h>
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#include <map>
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#include <android/log.h>
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#define LOGI(...) ((void)__android_log_print(4, "ligma", __VA_ARGS__))
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#define LOGW(...) ((void)__android_log_print(5, "ligma", __VA_ARGS__))
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namespace ligma
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{
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namespace hook
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{
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//
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// TODO this doesnt work yet, needs to be debugged!
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//
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inline void* got_hook(elf32_hdr* module_base, const std::pair<const char*, const char*>& module_info, void* new_ptr)
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{
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if (!module_base || !module_info.first || !module_info.second || !new_ptr)
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return {};
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const auto orig_module_base = dlopen(module_info.first, RTLD_NOW);
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const auto orig_ptr = dlsym(orig_module_base, module_info.second);
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const auto shstrtab_header_offset = module_base->e_shoff + module_base->e_shstrndx * sizeof(elf32_shdr);
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const auto shstr_header = reinterpret_cast<elf32_shdr*>(reinterpret_cast<std::uintptr_t>(module_base) + shstrtab_header_offset);
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const auto shstr_section = reinterpret_cast<const char*>(module_base) + shstr_header->sh_offset;
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auto section_header = reinterpret_cast<elf32_shdr*>(reinterpret_cast<std::uintptr_t>(module_base) + module_base->e_shoff);
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for (auto idx = 0u; idx < module_base->e_shnum; ++idx)
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{
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if (strcmp(shstr_section + section_header->sh_name, ".got"))
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{
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for (auto section_value = reinterpret_cast<std::uintptr_t>(module_base) + section_header->sh_offset;
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section_value < reinterpret_cast<std::uintptr_t>(module_base) + section_header->sh_size; section_value += 0x8)
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if (*reinterpret_cast<void**>(section_value) == orig_ptr)
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*reinterpret_cast<void**>(section_value) = new_ptr;
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break;
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}
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section_header++;
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}
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return orig_ptr;
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}
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}
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}
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