52 lines
1.5 KiB
Markdown
52 lines
1.5 KiB
Markdown
# 零点传输协议
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用于控制数据包如何交换，工作在TCP协议栈之上。
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## 交叉编译
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由于LingTransmit依赖于openssl，所以你需要为目标操作系统交叉编译openssl。
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以Android aarch64为例
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~~~ bash
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git clone https://github.com/openssl/openssl.git
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cd openssl
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export ANDROID_NDK_HOME=/home/ling/Android/Sdk/ndk/28.0.12916984/
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export TOOLCHAIN=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64
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export TARGET=aarch64-linux-android
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export ANDROID_NDK_ROOT=$ANDROID_NDK_HOME
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export PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
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# 生成构建清单，指定安装目录为/home/ling/Android/openssl/aarch64，no-shared表示构建静态库
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./Configure android-arm64 -D__ANDROID_API__=34 --prefix=/home/ling/Android/openssl/aarch64 -DOPENSSL_STATIC=1 no-shared
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make -j15
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make install
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~~~
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然后需要设置一些环境变量，使得Cargo找到需要使用的库。
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~~~ bash
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export OPENSSL_DIR=/home/ling/Android/openssl/aarch64
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export OPENSSL_LIB_DIR=$OPENSSL_DIR/lib
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export OPENSSL_INCLUDE_DIR=$OPENSSL_DIR/include
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# 允许 pkg-config 跨平台查找
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export PKG_CONFIG_ALLOW_CROSS=1
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export PKG_CONFIG_PATH=$OPENSSL_DIR/lib/pkgconfig
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export PKG_CONFIG_SYSROOT_DIR=$NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/sysroot
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~~~
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然后，在项目根目录创建 *.cargo/config.toml* 并添加：
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~~~ toml
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[target.aarch64-linux-android]
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linker = "aarch64-linux-android-clang"
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ar = "llvm-ar"
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~~~
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最后，即可清理缓存并重新构建
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~~~ bash
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cargo clean
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cargo build --release --target=aarch64-linux-android
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~~~ |