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How eCapture works

Architecture

Compilation instructions

Compiling from source on Linux

Linux prerequisites

Linux kernel 4.18 or later. x86_64/aarch64 architecture.

prerequisites

  • golang 1.21 or newer
  • clang 9.0 or newer
  • cmake 3.18.4 or newer
  • clang backend: llvm 9.0 or newer

ubuntu

If you are using Ubuntu 20.04 or later versions, you can use a single command to complete the initialization of the compilation environment.

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/gojue/ecapture/master/builder/init_env.sh)"

other Linux

In addition to the software listed in the 'Toolchain Version' section above, the following software is also required for the compilation environment. Please install it yourself.

  • linux-tools-common
  • linux-tools-generic
  • pkgconf
  • libelf-dev

Clone the repository code and compile it

Caution: The following make command will install libpcap into the system directory if libpcap.a does not exist under /usr/local/lib. If you have installed libpcap in system without libpcap.a, it maybe break your libpcap's headers.

git clone --recurse-submodules git@github.com:gojue/ecapture.git
cd ecapture
make
bin/ecapture

compile without BTF

eCapture support BTF disabled with command make nocore to compile at 2022/04/17. It can work normally even on Linux systems that do not support BTF.

make nocore
bin/ecapture --help

cross-compilation

Kernel header files

To cross-compile the eCapture tool, you need to install the kernel header files for the target architecture. you need to install the linux-source package.

sudo apt-get install -y linux-source
cd /usr/src
source_file=$(find . -maxdepth 1 -name "*linux-source*.tar.bz2")
source_dir=$(echo "$source_file" | sed 's/\.tar\.bz2//g')  
sudo tar -xf $source_file
cd $source_dir
test -f .config || yes "" | sudo make oldconfig

ToolChains

To cross-compile binary files for the aarch64 architecture on an amd64 architecture system, you need to install the gcc-aarch64-linux-gnu toolchain. Similarly, to cross-compile binary files for the amd64 architecture on an aarch64 system, you need to install the gcc-x86-64-linux-gnu toolchain.

  • amd64 arch: gcc-aarch64-linux-gnu
  • arm64 arch: gcc-x86-64-linux-gnu

Build Commands

To build an arm64 artifact on an ubuntu amd64 system, you can set the CROSS_ARCH environment variable to achieve cross-compilation.

CROSS_ARCH=arm64 make

What's eBPF

eBPF