Add README

README.md

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+Bird-lg-go
+==========
+
+An alternative implementation for [bird-lg](https://github.com/sileht/bird-lg) written in Go. Both frontend and backend (proxy) are implemented, and can work with either the original Python implementation or the Go implementation.
+
+Frontend
+--------
+
+The frontend directory contains the code for the web frontend, where users see BGP states, do traceroutes and whois, etc. It's a replacement for "lg.py" in original bird-lg project.
+
+Features implemented:
+
+- Show peering status (`show protocol` command)
+- Query route (`show route for ...`, `show route where net ~ [ ... ]`)
+- Whois and traceroute
+- Work with both Python proxy (lgproxy.py) and Go proxy (proxy dir of this project)
+
+Features not implemented yet:
+
+- Visualize AS paths as picture (bgpmap feature)
+
+Usage: all configuration is done via commandline parameters or environment variables, no config file.
+
+- --servers / BIRDLG_SERVERS: server name prefixes, separated by comma
+- --domain / BIRDLG_DOMAIN: server name domain suffixes
+- --listen / BIRDLG_LISTEN: address bird-lg is listening on (default ":5000")
+- --proxy-port / BIRDLG_PROXY_PORT: port bird-lgproxy is running on (default 8000)
+- --whois / BIRDLG_WHOIS: whois server for queries (default "whois.verisign-grs.com")
+
+Example: the following command starts the frontend with 2 BIRD nodes, with domain name "gigsgigscloud.dn42.lantian.pub" and "hostdare.dn42.lantian.pub", and proxies are running on port 8000 on both nodes.
+
+    ./frontend --servers=gigsgigscloud,hostdare --domain=dn42.lantian.pub --proxy-port=8000
+
+Example: the following docker-compose.yml entry does the same as above, but by starting a Docker container:
+
+    bird-lg:
+      image: xddxdd/bird-lg-go
+      container_name: bird-lg
+      restart: always
+      environment:
+        - BIRDLG_SERVERS=gigsgigscloud,hostdare
+        - BIRDLG_DOMAIN=dn42.lantian.pub
+      ports:
+        - "5000:5000"
+
+Demo: https://lg.lantian.pub
+
+Proxy
+-----
+
+The proxy directory contains the code for the "proxy" for bird commands and traceroutes. It's a replacement for "lgproxy.py" in original bird-lg project.
+
+Features implemented:
+
+- Sending queries to BIRD and BIRD6 (only BIRDv1 is tested)
+- Sending "restrict" command to BIRD to prevent unauthorized changes
+- Executing traceroute command on Linux, FreeBSD and OpenBSD
+
+Features not implemented yet:
+
+- Source IP restriction
+
+Usage: all configuration is done via commandline parameters or environment variables, no config file.
+
+- --bird / BIRD_SOCKET: socket file for bird, set either in parameter or environment variable BIRD_SOCKET (default "/var/run/bird/bird.ctl")
+- --bird6 / BIRD6_SOCKET: socket file for bird6, set either in parameter or environment variable BIRD6_SOCKET (default "/var/run/bird/bird6.ctl")
+- --listen / BIRDLG_LISTEN: listen address, set either in parameter or environment variable BIRDLG_LISTEN (default ":8000")
+
+Example: start proxy with default configuration, should work "out of the box" on Debian 9:
+
+    ./proxy
+
+Example: start proxy with custom bird socket location:
+
+    ./proxy --bird /run/bird.ctl --bird6 /run/bird6.ctl
+
+Example: the following docker-compose.yml entry does the same as above, but by starting a Docker container:
+
+    bird-lgproxy:
+      image: xddxdd/bird-lgproxy-go
+      container_name: bird-lgproxy
+      restart: always
+      volumes:
+        - "/run/bird.ctl:/var/run/bird/bird.ctl"
+        - "/run/bird6.ctl:/var/run/bird/bird6.ctl"
+      ports:
+        - "192.168.0.1:8000:8000"
+
+(As the proxy doesn't have source IP restriction yet, you should only bind the proxy to a specific interface, or use external firewall for security)
+
+Credits
+-------
+
+- Mehdi Abaakouk for creating [the original bird-lg project](https://github.com/sileht/bird-lg)
+- [Bootstrap](https://getbootstrap.com/) as web UI framework
+
+License
+-------
+
+GPL 3.0