how to get arm-v7 & v8 static lib ?

[w296488320]

I want to use r2 on android but I cannot find the android arm-v7 or v8 right now. How should I download it? I didn't find it in the built product. I saw a static compression package, but I found out that it was of the x86 architecture

[trufae]

did u checked the radare2-5.9.8-android-arm.tar.gz from the release page?

$ file *
r2:      ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /system/bin/linker, with debug_info, not stripped

[w296488320]

I have checked this compression package with only so files and what I am needing is am-v7 and am-v8. A Static library file and not a dynamic library file because I need to use this static library inside the code. Go to parse some so files.

I tried to compile r2 but failed and didn t produce what I needed. A file, if possible, can be added to the package [radare2-5.9.8-android-arm.tar.gz]. A file? I really need him. Thank you, the great developers.

[trufae]

check the sys/android.sh script? this is building a static compilation of everything but you can just pick the non-static target and it should work

[w296488320]

CC set.c
CC diff.c
CC heap.c
CC main.c
AR libsdb.a
ar: creating libsdb.a
BIN sdb
../subprojects/sdb/sdb: Mach-O 64-bit executable arm64

TARGET SDB

CC cdb.c
CC cdb_make.c
make[5]: ndk-gcc: No such file or directory
CC ls.c
CC ht.c
make[5]: ndk-gcc: No such file or directory
make[5]: ndk-gcc: No such file or directory
make[5]: ndk-gcc: No such file or directory
make[5]: *** [ht.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[5]: *** [cdb.o] Error 1
make[5]: *** [ls.o] Error 1
make[5]: *** [cdb_make.o] Error 1
make[4]: *** [sdb_objs] Error 2
make[3]: *** [sdb-target] Error 2
make[2]: *** [../subprojects/sdb/src/libsdb.a] Error 2
make[1]: *** [sdbs] Error 2
make: *** [all] Error 2
localhost:sys didi$

I tried to compile using the NDK.

export NDK=/Users/didi/Library/Android/sdk/ndk/17.2.4988734
export ANDROID_API=21
./sys/android-build.sh arm-static

After setting the corresponding parameters, the compilation discovery prompted me that ndk-gcc cannot find it. Now the latest version of NDK should have no gcc compiler, which should be clean. How should I fix it?

[w296488320]

void TestR2()   {
    LOGE("TestR2 start -----\n");
    // 初始化 Radare2 核心
    auto core = r_core_new();
    if (!core) {
        LOGE("Failed to create RCore\n");
        return;
    }
    LOGE("TestR2 111111 %s",getlibArtPath().c_str());

    // 打开 .so 文件
    auto bf = r_core_file_open(core, getlibArtPath().c_str(), R_PERM_R, 0);
    if (!bf) {
        LOGE("Failed to open file: %s\n", getlibArtPath().c_str());
        r_core_free(core);
        return;
    }
    LOGE("TestR2 22222222\n");

    // 获取架构信息并设置
    auto info = r_bin_get_info(core->bin);
    if (info) {
        r_config_set(core->config, "asm.arch", info->arch);
        r_config_set_i(core->config, "asm.bits", info->bits);
        LOGE("Architecture: %s, Bits: %d\n", info->arch, info->bits);
    } else {
        LOGE("Failed to get binary info, using default ARM 32\n");
        r_config_set(core->config, "asm.arch", "arm");
        r_config_set_i(core->config, "asm.bits", 32);
    }
    LOGE("TestR2 33333333333\n");

    // 执行自动分析
    r_core_cmd0(core, "aaa");  // 全面分析
    LOGE("TestR2 4444444444\n");
    // 获取函数列表
    char *funcList = r_core_cmd_str(core, "afl");  // "afl" 列出所有函数
    if (!funcList) {
        LOGE("Failed to get function list\n");
        r_io_close(core->io);
        r_core_free(core);
        return;
    }
    LOGE("TestR2 555555555 %s ",funcList);
    std::string funcStr(funcList);
    std::istringstream iss(funcStr);
    std::string line;
    while (std::getline(iss, line)) {
        // 跳过空行和标题行
        if (line.empty() || line.find("address") != std::string::npos) {
            continue;
        }
        // 解析每行函数信息，格式通常为: address size name
        std::istringstream lineStream(line);
        std::string address, size, name;
        lineStream >> address >> size >> name;
        if (!name.empty()) {
            LOGE("Function: %s, Address: %s, Size: %s\n", name.c_str(), address.c_str(), size.c_str());
        }
    }
    // 清理资源
    r_io_close(core->io);
    r_core_free(core);
    LOGE("TestR2 end -----\n");
}

I want to implement a basic function to walk through all the so file all the function offset, this so file may be unsigned, what is wrong with my code? I am learning the r2

[vicky-dx]

Hi @w296488320,

Your code looks mostly correct! Here are some suggestions to improve it:

Issues I see:

1. File loading - After opening the file with r_core_file_open(), you should also call:

   r_core_bin_load(core, getlibArtPath().c_str(), UT64_MAX);
   

Missing initialization - Call r_core_bin_load() before getting binary info

Function list parsing - The afl output format might vary. A better approach:

void TestR2() {
    LOGE("TestR2 start -----\n");
    
    // Initialize Radare2 core
    RCore *core = r_core_new();
    if (!core) {
        LOGE("Failed to create RCore\n");
        return;
    }
    
    // Open and load the .so file
    RCoreFile *cf = r_core_file_open(core, getlibArtPath().c_str(), R_PERM_R, 0);
    if (!cf) {
        LOGE("Failed to open file: %s\n", getlibArtPath().c_str());
        r_core_free(core);
        return;
    }
    
    // Load binary info
    r_core_bin_load(core, getlibArtPath().c_str(), UT64_MAX);
    
    // Get and set architecture
    RBinInfo *info = r_bin_get_info(core->bin);
    if (info) {
        r_config_set(core->config, "asm.arch", info->arch);
        r_config_set_i(core->config, "asm.bits", info->bits);
        LOGE("Architecture: %s, Bits: %d\n", info->arch, info->bits);
    }
    
    // Analyze
    LOGE("Starting analysis...\n");
    r_core_cmd0(core, "aaa");
    
    // Get functions using the API (better than parsing text)
    RList *fcns = r_anal_get_fcns(core->anal);
    if (fcns) {
        RListIter *iter;
        RAnalFunction *fcn;
        
        r_list_foreach(fcns, iter, fcn) {
            LOGE("Function: %s, Address: 0x%08llx, Size: %d\n", 
                 fcn->name, fcn->addr, fcn->_size);
        }
    } else {
        LOGE("No functions found\n");
    }
    
    // Cleanup
    r_core_free(core);
    LOGE("TestR2 end -----\n");
}

For static libraries:

If you still need ARM static libs for Android and the NDK build is failing, try:

1. Use latest NDK - NDK r25+ uses Clang, not GCC
2. Try meson build instead of Make
3. Or use prebuilt - Check the latest release for radare2-android-arm.tar.gz