frida server bootstrap script

adb-bootstrap-frida-server.sh

#!/usr/bin/env bash

set -e

check_dependencies() {
    local missing=()
    command -v adb >/dev/null || missing+=("adb");
    command -v curl >/dev/null || missing+=("curl");
    command -v unxz >/dev/null || missing+=("unxz");
    
    if [ ${#missing[@]} -gt 0 ]; then
        echo "[!] Missing dependencies: ${missing[*]}";
        exit 1;
    fi
}

usage() {
    local script_name=$(basename $0)

    echo "Usage: $script_name [OPTIONS]";
    echo "Options:";
    echo "  --version FRIDA_VERSION    Specify Frida version (e.g. 16.0.0)";
    echo "  --arch ARCH                Specify architecture (arm, arm64, x86, x86_64)";
    echo "  --help                     Show this help message";
    echo "";
    echo "Examples:";
    echo "  $script_name";
    echo "  $script_name --version 15.2.2";
    echo "  $script_name --version 16.0.0 --arch arm64";
    exit 1;
}

main() {
    check_dependencies;

    while [[ $# -gt 0 ]]; do
      case $1 in
        --version) 
          FRIDA_VERSION="$2";
          shift 2;
          ;;
        --arch)
          ARCH="$2"
          shift 2;
          ;;
        --help)
          usage;
          ;;
        *)
          echo "Unknown option $1" >&2;
          usage;
          exit 1;
          ;;
      esac
    done

    local CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/frida-server";
    mkdir -p "${CACHE_DIR}" || {
        echo "[!] Failed to create cache directory";
        exit 1;
    }

    if [ -z "$FRIDA_VERSION" ]; then
        FRIDA_VERSION=$(frida --version 2>/dev/null || 
            curl -sL "https://api.github.com/repos/frida/frida/releases/latest" | 
            grep -oP '"tag_name": "\K[^"]+');
    fi

    if [ -z "$ARCH" ]; then
        ARCH=$(adb shell getprop ro.product.cpu.abi);
        case "${ARCH}" in
            arm64-v8a) ARCH="arm64";;
            armeabi-v7a|armeabi) ARCH="arm";;
            x86_64) ARCH="x86_64";;
            x86) ARCH="x86";;
            *) 
              echo "[!] Unsupported architecture: ${ARCH}"; 
              exit 1;
              ;;
        esac
    else
        case "${ARCH}" in
            arm64|arm|x86_64|x86) ;;
            *)
              echo "[!] Unsupported architecture: ${ARCH}";
              exit 1;
              ;;
        esac
    fi

    local SERVER_FILE="frida-server-${FRIDA_VERSION}-android-${ARCH}.xz";
    local CACHED_SERVER="${CACHE_DIR}/${SERVER_FILE}";
    local EXTRACTED_NAME="frida-server-${FRIDA_VERSION}-android-${ARCH}";
    local EXTRACTED_PATH="${CACHE_DIR}/${EXTRACTED_NAME}";

    if [ ! -f "${EXTRACTED_PATH}" ]; then
        echo "[*] Downloading Frida server ${FRIDA_VERSION} for ${ARCH}...";
        local DOWNLOAD_URL="https://github.com/frida/frida/releases/download/${FRIDA_VERSION}/${SERVER_FILE}";
        
        if ! curl -sL -o "${CACHED_SERVER}" "${DOWNLOAD_URL}"; then
            echo "[!] Download failed";
            exit 1;
        fi

        echo "[*] Extracting with unxz..."
        if ! unxz -f "${CACHED_SERVER}"; then
            echo "[!] Extraction failed";
            exit 1;
        fi
    fi

    echo "[*] Pushing to device...";
    adb push "${EXTRACTED_PATH}" "/data/local/tmp/frida-server" || {
        echo "[!] Push failed";
        exit 1;
    }

    echo "[*] Checking root access...";
    if adb shell "su 0 sh -c 'echo root_check'" | grep -q "root_check"; then
        echo "[+] Root access confirmed";
        echo "[*] Starting frida-server as root...";

        ! adb shell "su 0 sh -c 'chmod 755 /data/local/tmp/frida-server'";
        ! adb shell "su 0 sh -c 'pkill -9 frida-server 2>/dev/null'";
        ! adb shell "su 0 sh -c '/data/local/tmp/frida-server -D &'";

        if adb shell "su 0 sh -c 'pgrep frida-server' >/dev/null"; then
          echo "[+] Success! frida server ${FRIDA_VERSION} running as root";
        else
          echo "[!] Failed to start frida server";
        fi
    else
        echo "[!] No root access";
        exit 1;
    fi
}

main "$@";