Cloudflare DDNS CLI Client

Getting start

Cross compile to x86_64-unknown-linux-musl

Use docker to cross compile to x86_64-unknown-linux-musl

Here I am using my rust-musl docker image to cross compile.

$ docker pull skyuplam/rust-musl-armhf:x86_64-unknown-linux-musl
$ docker run --rm \
  --volume $(pwd):/home/cross/project \
  --volume ~/.cargo/registry:/home/cross/.cargo/registry \
  skyuplam/rust-musl-armhf:x86_64-unknown-linux-musl \
  cargo build --release

Cross Compile to mipsel-unknown-linux-musl for openwrt

1. We need to know the triple for the target device, e.g. Asus RT-N56U router. According to the Techdata, the target should be mipsel-unknown-linux-musl.
2. Download the openwrt SDK, which can be found on this page such that we can cross compile rust to openwrt. We have to set the path to the toolchains folder as an environment var $STAGING_DIR, and set the bin folder under the toolchains into $PATH.

cd /tmp
wget https://downloads.lede-project.org/releases/17.01.4/targets/ramips/rt3883/lede-sdk-17.01.4-ramips-rt3883_gcc-5.4.0_musl-1.1.16.Linux-x86_64.tar.xz
tar xf lede-sdk-17.01.4-ramips-rt3883_gcc-5.4.0_musl-1.1.16.Linux-x86_64.tar.xz
cd lede-sdk-17.01.4-ramips-rt3883_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir

" Set env STAGING_DIR
set -x STAGING_DIR /tmp/lede-sdk-17.01.4-ramips-rt3883_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchains
set -x PATH $STAGING_DIR/bin $PATH

3. As the project depends openssl, we also need to cross compile the openssl lib for openwrt in order to link the compiled lib which is required by rust-openssl as $OPENSSL_LIB_DIR and $OPENSSL_INCLUDE_DIR.

cd /tmp
" Download the source
wget https://www.openssl.org/source/openssl-1.0.1t.tar.gz
tar xzf openssl-1.0.1t.tar.gz
cd openssl-1.0.1t

" Compile
env MACHINE=mipsel ARCH=musl CC=mipsel-openwrt-linux-gcc ./config shared
env MACHINE=mipsel ARCH=musl CC=mipsel-openwrt-linux-gcc make
" Export as env
set -x OPENSSL_LIB_DIR /tmp/openssl-1.0.1t/
set -x OPENSSL_INCLUDE_DIR /tmp/openssl-1.0.1t/include

4. Compile the program

env CC=mipsel-openwrt-linux-gcc LD=mipsel-openwrt-linux-ld cargo build --target=mipsel-unknown-linux-musl

Usages

Type --help for more info

ddns --help

Examples

# To update www.doamin.com to point to your current machine's external IP
env DDNS_API_TOKEN=123444oijoij DDNS_ZONE=09s9080f980s ddns www.domain.com

Tested device

• Asus RT-N56U with OpenWrt v17.01.4
• PCEngines APU2 - Debian Stretch