RTCagent is an HEP/eBPF powered observability tool for VoIP/WebRTC Applications.

About

RTCAgent is a next-generation HEP Agent developed using the latest eBPF technologies.

RTCAgent greatly differs from any other previous HEP Agent in several ways:

• Unlike native agents, it does not require any code modifications or patches
• Unlike passive agents, it does not require access to network interfaces and packets
• Unlike any other agent, it traces functions used for sending/receiving data

The result is a new, lightweight and portable HEP Agent able to mirror SIP packets through eBPF hooks
from the core of supported applications bypassing manual code integrations, network encryption and complexity.

Download

Download an amd64/x86 static build of rtcagent and use it immediately on modern kernels.

curl -fsSL github.com/sipcapture/rtcagent/releases/latest/download/rtcagent -O && chmod +x rtcagent

Prefer using packages? Get the latest deb and rpm releases for amd64/x86

Usage

NAME:	rtcagent - Capture and debug RTC Projects.
USAGE:	rtcagent [flags]

COMMANDS:

	help		Help about any command
	freeswitch	capture SIP messages from freeswitch (libsofia): t_port, su_recv
	kamailio	capture SIP messages from kamailio: recv_msg, udp_send, tcp_send.
        opensips	capture SIP messages from v: recv_msg, udp_send, tcp_send.
	tcprtt		show tcp rtt stats
  monitor		show advanced monitor statistics


DESCRIPTION:

	RTCAgent is a tool that can capture and trace SIP packets using eBPF hooks and HEP

	Usage:
	  rtcagent <command> -h

OPTIONS:
  -d, --debug[=false]		enable debug logging
  -h, --help[=false]		help for rtcagent
  -P, --hep-port="9060"		hep port - default 9060
  -S, --hep-server=""		hep server to duplicate: i.e. 10.0.0.1
  -T, --hep-transport="udp"	hep transport default udp. Can be udp, tcp, tls
      --hex[=false]		print byte strings as hex encoded strings
  -l, --log-file=""		-l save the packets to file
      --nosearch[=false]	no lib search
  -p, --pid=0			if pid is 0 then we target all pids
  -u, --uid=0			if uid is 0 then we target all users
  -v, --version[=false]		version for rtcagent

Build

Compatible with Linux/Android kernel versions >= x86_64 5.x, >= aarch64 5.5.
Linux only. Does not support Windows and macOS.

Requirements

• golang 1.18 or newer
• clang 9.0 or newer
• cmake 3.18.4 or newer
• clang backend: llvm 9.0 or newer
• kernel config:CONFIG_DEBUG_INFO_BTF=y

Instructions

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//sipcapture/rtcagent/master/builder/init_env.sh)"

Any 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 before proceeding.

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

Clone the repository code and compile

git clone git@github.com:/sipcapture/rtcagent.git
cd rtcagent
make
bin/rtcagent

compile without BTF

RTCAgent support BTF disabled with command make nocore to compile at 2022/04/17 and can run on Linux systems that do not support BTF.

make nocore
bin/rtcagent --help

Usage

Run rtcagent on a native host attaching to a local binary target

Kamailio

./rtcagent kamailio -T udp -P 9060 -S $HOMER -m /usr/sbin/kamailio

OpenSIPS

./rtcagent opensips -T tcp -P 9061 -S $HOMER -m /usr/sbin/opensips

FreeSwitch

./rtcagent freeswitch -T udp -P 9060 -S $HOMER -m /usr/sbin/freeswitch

Docker

Hypervisor Mode

Run rtcagent as a priviledged container on your host attaching to a local binary target

rtcagent:
    privileged: true
    pid: host
    image: ghcr.io/sipcapture/rtcagent
    container_name: rtcagent
    restart: unless-stopped
    volumes:
      - /sys/fs/cgroup:/host/sys/fs/cgroup:ro
      - /sys/kernel/debug:/sys/kernel/debug:rw
    command: --cgroupfs-root=/host/sys/fs/cgroup

Cross-Container Mode

Run rtcagent as a priviledged container attached to a target container via docker volume mounts

Kamailio

rtcagent:
    privileged: true
    image: ghcr.io/sipcapture/rtcagent
    container_name: rtcagent
    restart: unless-stopped
    volumes:
      - $(docker inspect --format="{{.GraphDriver.Data.MergedDir}}" kamailio)/usr/sbin/kamailio:/kamailio:ro
    command: /rtcagent kamailio -m /kamailio
    depends_on:
      - kamailio

OpenSIPS

rtcagent:
    privileged: true
    image: ghcr.io/sipcapture/rtcagent
    container_name: rtcagent
    restart: unless-stopped
    volumes:
      - $(docker inspect --format="{{.GraphDriver.Data.MergedDir}}" opensips)/usr/sbin/opensips:/opensips:ro
    command: /rtcagent opensips -m /opensips
    depends_on:
      - opensips

Credits

RTCAgent is inspired by Cilum, Odigos, eCapture and the many eBPF guides, libraries and implementations.