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#!/usr/bin/env python3
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# Licensed under GPLv3
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#
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# Simple http server to allow user control of n2n edge nodes
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#
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# Currently only for demonstration
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# - needs nicer looking html written
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# - needs more json interfaces in edge
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#
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# Try it out with
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# http://localhost:8080/
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# http://localhost:8080/edge/peer
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# http://localhost:8080/edge/super
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import argparse
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import socket
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import json
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import socketserver
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import http.server
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import signal
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import functools
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from http import HTTPStatus
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class JsonUDP():
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"""encapsulate communication with the edge"""
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def __init__(self, port):
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self.address = "127.0.0.1"
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self.port = port
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self.tag = 0
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self.key = None
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self.debug = False
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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def _next_tag(self):
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tagstr = str(self.tag)
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self.tag = (self.tag + 1) % 1000
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return tagstr
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def _cmdstr(self, msgtype, cmdline):
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"""Create the full command string to send"""
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tagstr = self._next_tag()
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options = [tagstr]
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if self.key is not None:
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options += ['1'] # Flags set for auth key field
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options += [self.key]
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optionsstr = ':'.join(options)
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return tagstr, ' '.join((msgtype, optionsstr, cmdline))
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def _rx(self, tagstr):
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"""Wait for rx packets"""
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# TODO: there are no timeouts with any of the recv calls
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data, _ = self.sock.recvfrom(1024)
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data = json.loads(data.decode('utf8'))
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# TODO: We assume the first packet we get will be tagged for us
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# and be either an "error" or a "begin"
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assert(data['_tag'] == tagstr)
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if data['_type'] == 'error':
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raise ValueError('Error: {}'.format(data['error']))
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assert(data['_type'] == 'begin')
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# Ideally, we would confirm that this is our "begin", but that
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# would need the cmd passed into this method, and that would
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# probably require parsing the cmdline passed to us :-(
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# assert(data['cmd'] == cmd)
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result = list()
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while True:
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data, _ = self.sock.recvfrom(1024)
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data = json.loads(data.decode('utf8'))
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if data['_tag'] != tagstr:
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# this packet is not for us, ignore it
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continue
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if data['_type'] == 'error':
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raise ValueError('Error: {}'.format(data['error']))
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if data['_type'] == 'end':
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return result
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if data['_type'] != 'row':
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raise ValueError('Unknown data type {} from '
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'edge'.format(data['_type']))
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# remove our boring metadata
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del data['_tag']
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del data['_type']
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if self.debug:
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print(data)
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result.append(data)
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def _call(self, msgtype, cmdline):
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"""Perform a rpc call"""
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tagstr, msgstr = self._cmdstr(msgtype, cmdline)
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self.sock.sendto(msgstr.encode('utf8'), (self.address, self.port))
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return self._rx(tagstr)
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def read(self, cmdline):
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return self._call('r', cmdline)
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def write(self, cmdline):
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return self._call('w', cmdline)
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indexhtml = """
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<html>
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<head>
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<title>n2n management</title>
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</head>
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<body>
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<div id="time"></div>
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<br>
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Supernodes:
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<div id="super"></div>
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<br>
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Peers:
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<div id="peer"></div>
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<script>
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function rows2table(id, columns, data) {
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let s = "<table border=1 cellspacing=0>"
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s += "<tr>"
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columns.forEach((col) => {
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s += "<th>" + col
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});
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data.forEach((row) => {
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s += "<tr>"
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columns.forEach((col) => {
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s += "<td>" + row[col]
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});
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});
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s += "</table>"
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let div = document.getElementById(id);
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div.innerHTML=s
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}
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function fetch_table(url, id, columns) {
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fetch(url)
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.then(function (response) {
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return response.json();
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})
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.then(function (data) {
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rows2table(id,columns,data);
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})
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.catch(function (err) {
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console.log('error: ' + err);
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});
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}
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function refresh_job() {
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let now = new Date().getTime();
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let time = document.getElementById('time');
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time.innerHTML="last updated: " + now;
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fetch_table(
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'edge/super',
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'super',
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['version','current','macaddr','sockaddr','uptime']
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);
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fetch_table(
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'edge/peer',
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'peer',
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['mode','ip4addr','macaddr','sockaddr','desc']
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);
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}
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function refresh_setup(interval) {
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var timer = setInterval(refresh_job, interval);
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}
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refresh_setup(5000);
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refresh_job();
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</script>
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</body>
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</html>
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"""
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class SimpleHandler(http.server.BaseHTTPRequestHandler):
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def __init__(self, rpc, *args, **kwargs):
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self.rpc = rpc
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super().__init__(*args, **kwargs)
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def log_request(self, code='-', size='-'):
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# Dont spam the output
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pass
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def _simplereply(self, number, message):
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self.send_response(number)
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self.end_headers()
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self.wfile.write(message.encode('utf8'))
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def do_GET(self):
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url_tail = self.path
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if url_tail == "/":
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self.send_response(HTTPStatus.OK)
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self.send_header('Content-type', 'text/html; charset=utf-8')
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self.end_headers()
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self.wfile.write(indexhtml.encode('utf8'))
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return
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if url_tail.startswith("/edge/"):
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tail = url_tail.split('/')
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cmd = tail[2]
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# if commands ever need args, use more of the path components
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try:
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data = self.rpc.read(cmd)
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except ValueError:
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self._simplereply(HTTPStatus.BAD_REQUEST, 'Bad Command')
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return
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self.send_response(HTTPStatus.OK)
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self.send_header('Content-type', 'application/json')
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self.end_headers()
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self.wfile.write(json.dumps(data).encode('utf8'))
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return
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self._simplereply(HTTPStatus.NOT_FOUND, 'Not Found')
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return
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def main():
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ap = argparse.ArgumentParser(
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description='Control the running local n2n edge via http')
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ap.add_argument('-t', '--mgmtport', action='store', default=5644,
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help='Management Port (default=5644)')
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ap.add_argument('-k', '--key', action='store',
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help='Password for mgmt commands')
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ap.add_argument('-d', '--debug', action='store_true',
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help='Also show raw internal data')
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ap.add_argument('port', action='store',
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default=8080, type=int, nargs='?',
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help='Serve requests on TCP port (default 8080)')
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args = ap.parse_args()
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rpc = JsonUDP(args.mgmtport)
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rpc.debug = args.debug
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rpc.key = args.key
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signal.signal(signal.SIGPIPE, signal.SIG_DFL)
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socketserver.TCPServer.allow_reuse_address = True
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handler = functools.partial(SimpleHandler, rpc)
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with socketserver.TCPServer(("", args.port), handler) as httpd:
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try:
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httpd.serve_forever()
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except KeyboardInterrupt:
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return
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if __name__ == '__main__':
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main()
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