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android: add logs in xposed module

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This commit is contained in:
Kavish Devar
2026-04-23 00:46:06 +05:30
parent 3346221569
commit fce90cf88a
1 changed files with 76 additions and 20 deletions
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96
android/app/src/xposed/cpp/l2c_fcr_hook.cpp
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@@ -46,12 +46,12 @@ static tBTA_STATUS (*original_BTA_DmSetLocalDiRecord)(
static std::atomic<bool> enableSdpHook(false);
uint8_t fake_l2c_fcr_chk_chan_modes(void* p_ccb) {
LOGI("l2c_fcr_chk_chan_modes called");
LOGI("fake_l2c_fcr_chk_chan_modes called");
uint8_t orig = 0;
if (original_l2c_fcr_chk_chan_modes)
orig = original_l2c_fcr_chk_chan_modes(p_ccb);
LOGI("Original returned %d, forcing 1", orig);
LOGI("fake_l2c_fcr_chk_chan_modes: orig = %d, returning 1", orig);
return 1;
}
@@ -59,21 +59,19 @@ tBTA_STATUS fake_BTA_DmSetLocalDiRecord(
tSDP_DI_RECORD* p_device_info,
uint32_t* p_handle) {
LOGI("BTA_DmSetLocalDiRecord called");
LOGI("fake_BTA_DmSetLocalDiRecord called");
if (original_BTA_DmSetLocalDiRecord && enableSdpHook.load(std::memory_order_relaxed)) original_BTA_DmSetLocalDiRecord(p_device_info, p_handle);
LOGI("BTA_DmSetLocalDiRecord changing vendor id and source");
LOGI("fake_BTA_DmSetLocalDiRecord: modifying vendor to 0x004C, vendor_id_source to 0x0001");
if (p_device_info) {
p_device_info->vendor = 0x004C;
p_device_info->vendor_id_source = 0x0001;
}
if (original_BTA_DmSetLocalDiRecord)
return original_BTA_DmSetLocalDiRecord(p_device_info, p_handle);
return BTA_FAILURE;
LOGI("fake_BTA_DmSetLocalDiRecord: returning status %d", original_BTA_DmSetLocalDiRecord ? original_BTA_DmSetLocalDiRecord(p_device_info, p_handle) : BTA_FAILURE);
return original_BTA_DmSetLocalDiRecord ? original_BTA_DmSetLocalDiRecord(p_device_info, p_handle) : BTA_FAILURE;
}
static bool decompressXZ(
@@ -81,13 +79,19 @@ static bool decompressXZ(
size_t input_size,
std::vector<uint8_t>& output) {
LOGI("decompressXZ called with input_size: %zu", input_size);
xz_crc32_init();
#ifdef XZ_USE_CRC64
xz_crc64_init();
#endif
struct xz_dec* dec = xz_dec_init(XZ_DYNALLOC, 64U << 20);
if (!dec) return false;
if (!dec) {
LOGE("decompressXZ: xz_dec_init failed");
return false;
}
LOGI("decompressXZ: xz_dec_init succeeded");
struct xz_buf buf{};
buf.in = input;
@@ -100,19 +104,25 @@ static bool decompressXZ(
buf.out_pos = 0;
buf.out_size = output.size();
LOGI("decompressXZ: entering decompression loop");
while (true) {
LOGI("decompressXZ: xz_dec_run iteration, buf.in_pos: %zu, buf.out_pos: %zu", buf.in_pos, buf.out_pos);
enum xz_ret ret = xz_dec_run(dec, &buf);
LOGI("decompressXZ: xz_dec_run returned %d", ret);
if (ret == XZ_STREAM_END)
break;
if (ret != XZ_OK) {
LOGE("decompressXZ: xz_dec_run error");
xz_dec_end(dec);
return false;
}
if (buf.out_pos == buf.out_size) {
size_t old = output.size();
LOGI("decompressXZ: resizing output to %zu", old * 2);
output.resize(old * 2);
buf.out = output.data();
buf.out_size = output.size();
@@ -121,21 +131,30 @@ static bool decompressXZ(
output.resize(buf.out_pos);
xz_dec_end(dec);
LOGI("decompressXZ: decompression successful, output size: %zu", output.size());
return true;
}
static bool getLibraryPath(const char* name, std::string& out) {
LOGI("getLibraryPath called with name: %s", name);
FILE* fp = fopen("/proc/self/maps", "r");
if (!fp) return false;
if (!fp) {
LOGE("getLibraryPath: fopen failed");
return false;
}
char line[1024];
LOGI("getLibraryPath: scanning /proc/self/maps");
while (fgets(line, sizeof(line), fp)) {
if (strstr(line, name)) {
LOGI("getLibraryPath: found line containing %s", name);
char* path = strchr(line, '/');
if (path) {
out = path;
out.erase(out.find('\n'));
LOGI("getLibraryPath: path found: %s", out.c_str());
fclose(fp);
return true;
}
@@ -143,24 +162,33 @@ static bool getLibraryPath(const char* name, std::string& out) {
}
fclose(fp);
LOGI("getLibraryPath: failed to find path for %s", name);
return false;
}
static uintptr_t getModuleBase(const char* name) {
LOGI("getModuleBase called with name: %s", name);
FILE* fp = fopen("/proc/self/maps", "r");
if (!fp) return 0;
if (!fp) {
LOGE("getModuleBase: fopen failed");
return 0;
}
char line[1024];
uintptr_t base = 0;
LOGI("getModuleBase: scanning /proc/self/maps");
while (fgets(line, sizeof(line), fp)) {
if (strstr(line, name)) {
base = strtoull(line, nullptr, 16);
LOGI("getModuleBase: found base at 0x%lx", base);
break;
}
}
fclose(fp);
LOGI("getModuleBase: failed to find base for %s", name);
return base;
}
@@ -168,6 +196,8 @@ static uint64_t findSymbolOffset(
const std::vector<uint8_t>& elf,
const char* symbol_substring) {
LOGI("findSymbolOffset called with symbol_substring: %s", symbol_substring);
auto* eh = reinterpret_cast<const Elf64_Ehdr*>(elf.data());
auto* shdr = reinterpret_cast<const Elf64_Shdr*>(
elf.data() + eh->e_shoff);
@@ -179,6 +209,7 @@ static uint64_t findSymbolOffset(
const Elf64_Shdr* symtab = nullptr;
const Elf64_Shdr* strtab = nullptr;
LOGI("findSymbolOffset: parsing ELF sections");
for (int i = 0; i < eh->e_shnum; ++i) {
const char* secname = shstr + shdr[i].sh_name;
if (!strcmp(secname, ".symtab"))
@@ -187,8 +218,11 @@ static uint64_t findSymbolOffset(
strtab = &shdr[i];
}
if (!symtab || !strtab)
if (!symtab || !strtab) {
LOGE("findSymbolOffset: symtab or strtab not found");
return 0;
}
LOGI("findSymbolOffset: found symtab and strtab");
auto* symbols = reinterpret_cast<const Elf64_Sym*>(
elf.data() + symtab->sh_offset);
@@ -199,24 +233,25 @@ static uint64_t findSymbolOffset(
size_t count = symtab->sh_size / sizeof(Elf64_Sym);
LOGI("findSymbolOffset: scanning %zu symbols", count);
for (size_t i = 0; i < count; ++i) {
const char* name = strings + symbols[i].st_name;
if (strstr(name, symbol_substring) &&
ELF64_ST_TYPE(symbols[i].st_info) == STT_FUNC) {
LOGI("Resolved %s at 0x%lx",
name,
(unsigned long)symbols[i].st_value);
LOGI("findSymbolOffset: matched symbol %s at 0x%lx", name, (unsigned long)symbols[i].st_value);
return symbols[i].st_value;
}
}
LOGI("findSymbolOffset: no match found for %s", symbol_substring);
return 0;
}
static bool hookLibrary(const char* libname) {
LOGI("hookLibrary called with libname: %s", libname);
if (!hook_func) {
LOGE("hook_func not initialized");
@@ -228,15 +263,21 @@ static bool hookLibrary(const char* libname) {
LOGE("Failed to locate %s", libname);
return false;
}
LOGI("hookLibrary: located path: %s", path.c_str());
int fd = open(path.c_str(), O_RDONLY);
if (fd < 0) return false;
if (fd < 0) {
LOGE("hookLibrary: open failed");
return false;
}
struct stat st{};
if (fstat(fd, &st) != 0) {
LOGE("hookLibrary: fstat failed");
close(fd);
return false;
}
LOGI("hookLibrary: opened file, size: %lld", (long long)st.st_size);
std::vector<uint8_t> file(st.st_size);
read(fd, file.data(), st.st_size);
@@ -250,9 +291,11 @@ static bool hookLibrary(const char* libname) {
reinterpret_cast<const char*>(
file.data() + shdr[eh->e_shstrndx].sh_offset);
LOGI("hookLibrary: parsing ELF header and sections");
for (int i = 0; i < eh->e_shnum; ++i) {
if (!strcmp(shstr + shdr[i].sh_name, ".gnu_debugdata")) {
LOGI("hookLibrary: found .gnu_debugdata section");
std::vector<uint8_t> compressed(
file.begin() + shdr[i].sh_offset,
@@ -263,11 +306,18 @@ static bool hookLibrary(const char* libname) {
if (!decompressXZ(
compressed.data(),
compressed.size(),
decompressed))
decompressed)) {
LOGE("hookLibrary: decompressXZ failed");
return false;
}
LOGI("hookLibrary: decompressed debug data, size: %zu", decompressed.size());
uintptr_t base = getModuleBase(libname);
if (!base) return false;
if (!base) {
LOGE("hookLibrary: getModuleBase failed");
return false;
}
LOGI("hookLibrary: module base: 0x%lx", base);
uint64_t chk_offset =
findSymbolOffset(decompressed,
@@ -277,6 +327,8 @@ static bool hookLibrary(const char* libname) {
findSymbolOffset(decompressed,
"BTA_DmSetLocalDiRecord");
LOGI("hookLibrary: chk_offset: 0x%lx, sdp_offset: 0x%lx", chk_offset, sdp_offset);
if (chk_offset) {
void* target =
reinterpret_cast<void*>(base + chk_offset);
@@ -285,7 +337,7 @@ static bool hookLibrary(const char* libname) {
(void*)fake_l2c_fcr_chk_chan_modes,
(void**)&original_l2c_fcr_chk_chan_modes);
LOGI("Hooked l2c_fcr_chk_chan_modes");
LOGI("hookLibrary: hooked l2c_fcr_chk_chan_modes");
}
if (sdp_offset) {
@@ -296,17 +348,19 @@ static bool hookLibrary(const char* libname) {
(void*)fake_BTA_DmSetLocalDiRecord,
(void**)&original_BTA_DmSetLocalDiRecord);
LOGI("Hooked BTA_DmSetLocalDiRecord");
LOGI("hookLibrary: hooked BTA_DmSetLocalDiRecord");
}
return true;
}
}
LOGI("hookLibrary: failed for %s", libname);
return false;
}
static void on_library_loaded(const char* name, void*) {
LOGI("on_library_loaded called with name: %s", name);
if (strstr(name, "libbluetooth_jni.so")) {
LOGI("Bluetooth JNI loaded");
@@ -323,6 +377,7 @@ extern "C"
[[gnu::visibility("default")]]
[[gnu::used]]
NativeOnModuleLoaded native_init(const NativeAPIEntries* entries) {
LOGI("native_init called with entries: %p", entries);
hook_func = (HookFunType)entries->hook_func;
LOGI("LibrePodsNativeHook initialized, sdp hook enabled: %d", enableSdpHook.load(std::memory_order_relaxed));
return on_library_loaded;
@@ -332,6 +387,7 @@ extern "C"
JNIEXPORT void JNICALL
Java_me_kavishdevar_librepods_utils_NativeBridge_setSdpHook(
JNIEnv*, jobject thiz, jboolean enable) {
LOGI("setSdpHook called with enable: %d", enable);
enableSdpHook.store(enable, std::memory_order_relaxed);
LOGI("sdp hook enabled: %d", enable);