OpenHarmony移植OpenSSH-9.6p1

本文主要介绍如何在OpenHarmony系统下通过ndk工具移植OpenSSH-9.6p1。

安装NDK工具

未编译过ohos-sdk的话，先执行下面的命令编译sdk：

./build.sh --product-name ohos-sdk --ccache

编译好ohos-sdk之后，可以直接从编译路径下拷贝到指定路径，当然也可以直接将out目录下的ohos sdk的native路径作为NDK的路径。如果下载的public-sdk，也可以从压缩包中解压native的压缩包（例如：native-linux-x64-4.0.10.13-Release.zip）到指令路径。这里以我们自行编译的full-sdk下的native拷贝为例（不同的版本生成路径可能会有差异）：

mkdir -p /opt/sdk/ohos/native/
cp -r ${OHOS_SRC}/out/sdk/packages/ohos-sdk/linux/10/native/ /opt/sdk/ohos/native/4.0.10.13

之后使用ndk编译时，该路径负责提供交叉编译工具和sysroot等依赖。

交叉编译zlib

zlib其实可以默认使用ndk中自带的库，这里也给出zlib的交叉编译方式。
下载源码和解压：

wget https://www.zlib.net/zlib-1.3.tar.gz
tar -xf zlib-1.3.tar.gz
cd zlib-1.3

编写编译脚本build.sh：

#!/bin/bash

set -e

if [ "$1" == "clean" ] || [ "$1" == "distclean" ];then
    make $1
    exit 0
fi

export OHOS_SDK_HONE=/opt/sdk/ohos
export OHOS_NATIVE_HOME=/opt/sdk/ohos/native/4.0.10.13

export PATH=$OHOS_NATIVE_HOME/llvm/bin:$PATH

export AR="$OHOS_NATIVE_HOME/llvm/bin/llvm-ar"
export AS="$OHOS_NATIVE_HOME/llvm/bin/llvm-as"
export LD="$OHOS_NATIVE_HOME/llvm/bin/ld.lld"
export RANLIB="$OHOS_NATIVE_HOME/llvm/bin/llvm-ranlib"
export STRIP="$OHOS_NATIVE_HOME/llvm/bin/llvm-strip"
export CC="$OHOS_NATIVE_HOME/llvm/bin/clang"
export NM="$OHOS_NATIVE_HOME/llvm/bin/llvm-nm"
export OBJDUMP="$OHOS_NATIVE_HOME/llvm/bin/llvm-objdump"

export CFLAGS="--target=arm-linux-ohos --sysroot=$OHOS_NATIVE_HOME/sysroot -g -fvisibility=hidden -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fno-addrsig -Wformat -Werror=format-security -fno-limit-debug-info  -fPIC -march=armv7-a -mthumb"
export CPPFLAGS="--target=arm-linux-ohos --sysroot=$OHOS_NATIVE_HOME/sysroot"
export LDFLAGS="--target=arm-linux-ohos --rtlib=compiler-rt -fuse-ld=lld -lunwind"

./configure --prefix=${
   PWD}/_install --static

make && make install

执行编译命令：

bash build.sh distclean
bash build.sh

交叉编译openssl

这里移植移植最新的v3.2.0版本的OpenSSL，测试过openssl-3.0.12也可以正常编译。
下载源码和解压：

wget https://www.openssl.org/source/openssl-3.2.0.tar.gz
tar -xf openssl-3.2.0.tar.gz
cd openssl-3.2.0

编写编译脚本build.sh：

#!/bin/bash

set -e

if [ "$1" == "clean" ] || [ "$1" == "distclean" ];then
    make $1
    exit 0
fi

export OHOS_SDK_HONE=/opt/sdk/ohos
export OHOS_NATIVE_HOME=/opt/sdk/ohos/native/4.0.10.13

export PATH=$OHOS_NATIVE_HOME/llvm/bin:$PATH

export AR="$OHOS_NATIVE_HOME/llvm/bin/llvm-ar"
export AS="$OHOS_NATIVE_HOME/llvm/bin/llvm-as"
export LD="$OHOS_NATIVE_HOME/llvm/bin/ld.lld"
export RANLIB="$OHOS_NATIVE_HOME/llvm/bin/llvm-ranlib"
export STRIP="$OHOS_NATIVE_HOME/llvm/bin/llvm-strip"
export CC="$OHOS_NATIVE_HOME/llvm/bin/clang"
export NM="$OHOS_NATIVE_HOME/llvm/bin/llvm-nm"
export OBJDUMP="$OHOS_NATIVE_HOME/llvm/bin/llvm-objdump"

export CFLAGS="--target=arm-linux-ohos --sysroot=$OHOS_NATIVE_HOME/sysroot -g -fvisibility=hidden -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fno-addrsig -Wformat -Werror=format-security -fno-limit-debug-info  -fPIC -march=armv7-a -mthumb"
export CPPFLAGS="--target=arm-linux-ohos --sysroot=$OHOS_NATIVE_HOME/sysroot"
export LDFLAGS="--target=arm-linux-ohos --rtlib=compiler-rt -fuse-ld=lld -lunwind -L${
    PWD}/_install/lib"

#./Configure linux-armv4 --prefix=${PWD}/_install zlib no-asm no-shared no-unit-test no-tests
./Configure linux-armv4 --prefix=${
   PWD}/_install zlib no-asm shared no-unit-test no-tests

# remove library atomic
sed -i 's/-latomic//g' ./Makefile

# use static library crypto and ssl
sed -i 's/-lcrypto/libcrypto.a/g' ./Makefile
sed -i 's/-lssl/libssl.a/g' ./Makefile

make -j$(($(nproc)*2)) && make install

由于ohos ndk中不带libatomic，编译时会报错，这里直接从自动生成的Makefile中删除atomic的依赖即可。另外我们希望openssh编译时以静态库的方式来连接crypto和ssl库，所以这里可以考虑把这两个库直接改成静态库的方式连接，也可以不改，不改的话默认链动态库。

执行编译命令：

bash build.sh distclean
bash build.sh

交叉编译openssh

zlib和openssl编译成功之后，就可以开始编译openssh了。
下载源码和解压：

wget https://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-9.6p1.tar.gz
tar -xf openssh-9.6p1.tar.gz
cd openssh-9.6p1

编写编译脚本build.sh：

#!/bin/bash

set -e

if [ "$1" == "clean" ] || [ "$1" == "distclean" ];then
    make $1
    exit 0
fi

export OHOS_SDK_HONE=/opt/sdk/ohos
export OHOS_NATIVE_HOME=/opt/sdk/ohos/native/4.0.10.13

export PATH=$OHOS_NATIVE_HOME/llvm/bin:$PATH

export AR="$OHOS_NATIVE_HOME/llvm/bin/llvm-ar"
export AS="$OHOS_NATIVE_HOME/llvm/bin/llvm-as"
export LD="$OHOS_NATIVE_HOME/llvm/bin/ld.lld"
export RANLIB="$OHOS_NATIVE_HOME/llvm/bin/llvm-ranlib"
export STRIP="$OHOS_NATIVE_HOME/llvm/bin/llvm-strip"
export CC="$OHOS_NATIVE_HOME/llvm/bin/clang"
export NM="$OHOS_NATIVE_HOME/llvm/bin/llvm-nm"
export OBJDUMP="$OHOS_NATIVE_HOME/llvm/bin/llvm-objdump"

export CFLAGS="--target=arm-linux-ohos --sysroot=$OHOS_NATIVE_HOME/sysroot -g -fvisibility=hidden -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fno-addrsig -Wformat -Werror=format-security -fno-limit-debug-info  -fPIC -march=armv7-a -mthumb"
export CPPFLAGS="--target=arm-linux-ohos --sysroot=$OHOS_NATIVE_HOME/sysroot"
export LDFLAGS="--target=arm-linux-ohos --rtlib=compiler-rt -fuse-ld=lld -lunwind"

./configure --prefix