mirror of
https://github.com/sileht/bird-lg.git
synced 2024-11-21 22:44:43 +01:00
8f091cf27e
From a deployment perspective, it's annoying to depend on memcached, and it's only used to cache DNS answers for the BGPmap. Fixes #73
684 lines
22 KiB
Python
684 lines
22 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# vim: ts=4
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###
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#
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# Copyright (c) 2012 Mehdi Abaakouk
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3 as
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# published by the Free Software Foundation
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#
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###
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import base64
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from datetime import datetime
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import subprocess
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import logging
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from logging.handlers import TimedRotatingFileHandler
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import re
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from urllib2 import urlopen
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from urllib import quote, unquote
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import json
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import random
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import argparse
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from toolbox import mask_is_valid, ipv6_is_valid, ipv4_is_valid, resolve, save_cache_pickle, load_cache_pickle, unescape
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#from xml.sax.saxutils import escape
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import pydot
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from flask import Flask, render_template, jsonify, redirect, session, request, abort, Response, Markup
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parser = argparse.ArgumentParser()
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parser.add_argument('-c', dest='config_file', help='path to config file', default='lg.cfg')
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args = parser.parse_args()
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app = Flask(__name__)
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app.config.from_pyfile(args.config_file)
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app.secret_key = app.config["SESSION_KEY"]
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app.debug = app.config["DEBUG"]
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file_handler = TimedRotatingFileHandler(filename=app.config["LOG_FILE"], when="midnight")
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file_handler.setLevel(getattr(logging, app.config["LOG_LEVEL"].upper()))
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app.logger.addHandler(file_handler)
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def get_asn_from_as(n):
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asn_zone = app.config.get("ASN_ZONE", "asn.cymru.com")
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try:
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data = resolve("AS%s.%s" % (n, asn_zone) ,"TXT").replace("'","").replace('"','')
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except:
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return " "*5
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return [ field.strip() for field in data.split("|") ]
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def add_links(text):
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"""Browser a string and replace ipv4, ipv6, as number, with a
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whois link """
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if type(text) in [str, unicode]:
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text = text.split("\n")
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ret_text = []
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for line in text:
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# Some heuristic to create link
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if line.strip().startswith("BGP.as_path:") or \
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line.strip().startswith("Neighbor AS:"):
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ret_text.append(re.sub(r'(\d+)', r'<a href="/whois?q=\1" class="whois">\1</a>', line))
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else:
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line = re.sub(r'([a-zA-Z0-9\-]*\.([a-zA-Z]{2,3}){1,2})(\s|$)', r'<a href="/whois?q=\1" class="whois">\1</a>\3', line)
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line = re.sub(r'(?<=\[)AS(\d+)', r'<a href="/whois?q=\1" class="whois">AS\1</a>', line)
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line = re.sub(r'(\d+\.\d+\.\d+\.\d+)', r'<a href="/whois?q=\1" class="whois">\1</a>', line)
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if len(request.path) >= 2:
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hosts = "/".join(request.path.split("/")[2:])
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else:
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hosts = "/"
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line = re.sub(r'\[(\w+)\s+((|\d\d\d\d-\d\d-\d\d\s)(|\d\d:)\d\d:\d\d|\w\w\w\d\d)', r'[<a href="/detail/%s?q=\1">\1</a> \2' % hosts, line)
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line = re.sub(r'(^|\s+)(([a-f\d]{0,4}:){3,10}[a-f\d]{0,4})', r'\1<a href="/whois?q=\2" class="whois">\2</a>', line, re.I)
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ret_text.append(line)
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return "\n".join(ret_text)
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def set_session(request_type, hosts, proto, request_args):
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""" Store all data from user in the user session """
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session.permanent = True
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session.update({
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"request_type": request_type,
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"hosts": hosts,
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"proto": proto,
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"request_args": request_args,
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})
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history = session.get("history", [])
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# erase old format history
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if type(history) != type(list()):
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history = []
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t = (hosts, proto, request_type, request_args)
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if t in history:
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del history[history.index(t)]
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history.insert(0, t)
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session["history"] = history[:20]
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def whois_command(query):
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server = []
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if app.config.get("WHOIS_SERVER", ""):
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server = [ "-h", app.config.get("WHOIS_SERVER") ]
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return subprocess.Popen(['whois'] + server + [query], stdout=subprocess.PIPE).communicate()[0].decode('utf-8', 'ignore')
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def bird_command(host, proto, query):
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"""Alias to bird_proxy for bird service"""
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return bird_proxy(host, proto, "bird", query)
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def bird_proxy(host, proto, service, query):
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"""Retreive data of a service from a running lgproxy on a remote node
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First and second arguments are the node and the port of the running lgproxy
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Third argument is the service, can be "traceroute" or "bird"
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Last argument, the query to pass to the service
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return tuple with the success of the command and the returned data
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"""
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path = ""
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if proto == "ipv6":
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path = service + "6"
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elif proto == "ipv4":
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path = service
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port = app.config["PROXY"].get(host, "")
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if not port:
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return False, 'Host "%s" invalid' % host
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elif not path:
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return False, 'Proto "%s" invalid' % proto
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url = "http://%s" % (host)
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if "DOMAIN" in app.config:
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url = "%s.%s" % (url, app.config["DOMAIN"])
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url = "%s:%d/%s?" % (url, port, path)
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if "SHARED_SECRET" in app.config:
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url = "%ssecret=%s&" % (url, app.config["SHARED_SECRET"])
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url = "%sq=%s" % (url, quote(query))
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try:
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f = urlopen(url)
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resultat = f.read()
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status = True # retreive remote status
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except IOError:
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resultat = "Failed to retrieve URL for host %s" % host
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app.logger.warning("Failed to retrieve URL for host %s: %s", host, url)
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status = False
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return status, resultat
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@app.context_processor
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def inject_commands():
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commands = [
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("traceroute", "traceroute ..."),
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("summary", "show protocols"),
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("detail", "show protocols ... all"),
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("prefix", "show route for ..."),
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("prefix_detail", "show route for ... all"),
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("prefix_bgpmap", "show route for ... (bgpmap)"),
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("where", "show route where net ~ [ ... ]"),
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("where_detail", "show route where net ~ [ ... ] all"),
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("where_bgpmap", "show route where net ~ [ ... ] (bgpmap)"),
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("adv", "show route ..."),
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("adv_bgpmap", "show route ... (bgpmap)"),
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]
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commands_dict = {}
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for id, text in commands:
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commands_dict[id] = text
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return dict(commands=commands, commands_dict=commands_dict)
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@app.context_processor
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def inject_all_host():
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return dict(all_hosts="+".join(app.config["PROXY"].keys()))
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@app.route("/")
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def hello():
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return redirect("/summary/%s/ipv4" % "+".join(app.config["PROXY"].keys()))
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def error_page(text):
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return render_template('error.html', errors=[text]), 500
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@app.errorhandler(400)
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def incorrect_request(e):
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return render_template('error.html', warnings=["The server could not understand the request"]), 400
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@app.errorhandler(404)
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def page_not_found(e):
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return render_template('error.html', warnings=["The requested URL was not found on the server."]), 404
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def get_query():
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q = unquote(request.args.get('q', '').strip())
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return q
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@app.route("/whois")
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def whois():
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query = get_query()
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if not query:
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abort(400)
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try:
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asnum = int(query)
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query = "as%d" % asnum
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except:
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m = re.match(r"[\w\d-]*\.(?P<domain>[\d\w-]+\.[\d\w-]+)$", query)
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if m:
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query = query.groupdict()["domain"]
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output = whois_command(query)
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return jsonify(output=output, title=query)
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SUMMARY_UNWANTED_PROTOS = ["Kernel", "Static", "Device", "Direct"]
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@app.route("/summary/<hosts>")
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@app.route("/summary/<hosts>/<proto>")
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def summary(hosts, proto="ipv4"):
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set_session("summary", hosts, proto, "")
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command = "show protocols"
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summary = {}
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errors = []
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for host in hosts.split("+"):
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ret, res = bird_command(host, proto, command)
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res = res.split("\n")
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if ret is False:
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errors.append("%s" % res)
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continue
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if len(res) <= 1:
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errors.append("%s: bird command failed with error, %s" % (host, "\n".join(res)))
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continue
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data = []
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for line in res[1:]:
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line = line.strip()
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if line and (line.split() + [""])[1] not in SUMMARY_UNWANTED_PROTOS:
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split = line.split()
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if len(split) >= 5:
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props = dict()
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props["name"] = split[0]
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props["proto"] = split[1]
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props["table"] = split[2]
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props["state"] = split[3]
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props["since"] = split[4]
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props["info"] = ' '.join(split[5:]) if len(split) > 5 else ""
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data.append(props)
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else:
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app.logger.warning("couldn't parse: %s", line)
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summary[host] = data
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return render_template('summary.html', summary=summary, command=command, errors=errors)
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@app.route("/detail/<hosts>/<proto>")
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def detail(hosts, proto):
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name = get_query()
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if not name:
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abort(400)
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set_session("detail", hosts, proto, name)
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command = "show protocols all %s" % name
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detail = {}
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errors = []
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for host in hosts.split("+"):
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ret, res = bird_command(host, proto, command)
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res = res.split("\n")
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if ret is False:
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errors.append("%s" % res)
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continue
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if len(res) <= 1:
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errors.append("%s: bird command failed with error, %s" % (host, "\n".join(res)))
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continue
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detail[host] = {"status": res[1], "description": add_links(res[2:])}
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return render_template('detail.html', detail=detail, command=command, errors=errors)
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@app.route("/traceroute/<hosts>/<proto>")
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def traceroute(hosts, proto):
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q = get_query()
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if not q:
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abort(400)
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set_session("traceroute", hosts, proto, q)
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if proto == "ipv6" and not ipv6_is_valid(q):
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try:
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q = resolve(q, "AAAA")
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except:
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return error_page("%s is unresolvable or invalid for %s" % (q, proto))
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if proto == "ipv4" and not ipv4_is_valid(q):
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try:
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q = resolve(q, "A")
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except:
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return error_page("%s is unresolvable or invalid for %s" % (q, proto))
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errors = []
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infos = {}
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for host in hosts.split("+"):
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status, resultat = bird_proxy(host, proto, "traceroute", q)
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if status is False:
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errors.append("%s" % resultat)
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continue
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infos[host] = add_links(resultat)
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return render_template('traceroute.html', infos=infos, errors=errors)
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@app.route("/adv/<hosts>/<proto>")
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def show_route_filter(hosts, proto):
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return show_route("adv", hosts, proto)
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@app.route("/adv_bgpmap/<hosts>/<proto>")
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def show_route_filter_bgpmap(hosts, proto):
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return show_route("adv_bgpmap", hosts, proto)
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@app.route("/where/<hosts>/<proto>")
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def show_route_where(hosts, proto):
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return show_route("where", hosts, proto)
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@app.route("/where_detail/<hosts>/<proto>")
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def show_route_where_detail(hosts, proto):
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return show_route("where_detail", hosts, proto)
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@app.route("/where_bgpmap/<hosts>/<proto>")
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def show_route_where_bgpmap(hosts, proto):
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return show_route("where_bgpmap", hosts, proto)
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@app.route("/prefix/<hosts>/<proto>")
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def show_route_for(hosts, proto):
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return show_route("prefix", hosts, proto)
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@app.route("/prefix_detail/<hosts>/<proto>")
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def show_route_for_detail(hosts, proto):
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return show_route("prefix_detail", hosts, proto)
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@app.route("/prefix_bgpmap/<hosts>/<proto>")
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def show_route_for_bgpmap(hosts, proto):
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return show_route("prefix_bgpmap", hosts, proto)
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def get_as_name(_as):
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"""Returns a string that contain the as number following by the as name
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"""
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if not _as:
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return "AS?????"
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if not _as.isdigit():
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return _as.strip()
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name = get_asn_from_as(_as)[-1].replace(" ", "\r", 1)
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return "AS%s | %s" % (_as, name)
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def get_as_number_from_protocol_name(host, proto, protocol):
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ret, res = bird_command(host, proto, "show protocols all %s" % protocol)
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re_asnumber = re.search("Neighbor AS:\s*(\d*)", res)
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if re_asnumber:
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return re_asnumber.group(1)
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else:
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return "?????"
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@app.route("/bgpmap/")
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def show_bgpmap():
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"""return a bgp map in a png file, from the json tree in q argument"""
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data = get_query()
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if not data:
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abort(400)
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data = base64.b64decode(data)
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data = json.loads(data)
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graph = pydot.Dot('BGPMAP', graph_type='digraph')
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nodes = {}
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edges = {}
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prepend_as = {}
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def escape(label):
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label = label.replace("&", "&")
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label = label.replace(">", ">")
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label = label.replace("<", "<")
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return label
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def add_node(_as, **kwargs):
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if _as not in nodes:
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kwargs["label"] = '<<TABLE CELLBORDER="0" BORDER="0" CELLPADDING="0" CELLSPACING="0"><TR><TD ALIGN="CENTER">' + escape(kwargs.get("label", get_as_name(_as))).replace("\r","<BR/>") + "</TD></TR></TABLE>>"
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nodes[_as] = pydot.Node(_as, style="filled", fontsize="10", **kwargs)
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graph.add_node(nodes[_as])
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return nodes[_as]
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def add_edge(_previous_as, _as, **kwargs):
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kwargs["splines"] = "true"
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force = kwargs.get("force", False)
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edge_tuple = (_previous_as, _as)
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if force or edge_tuple not in edges:
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edge = pydot.Edge(*edge_tuple, **kwargs)
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graph.add_edge(edge)
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edges[edge_tuple] = edge
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elif "label" in kwargs and kwargs["label"]:
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e = edges[edge_tuple]
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label_without_star = kwargs["label"].replace("*", "")
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if e.get_label() is not None:
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labels = e.get_label().split("\r")
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else:
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return edges[edge_tuple]
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if "%s*" % label_without_star not in labels:
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labels = [ kwargs["label"] ] + [ l for l in labels if not l.startswith(label_without_star) ]
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labels = sorted(labels, cmp=lambda x,y: x.endswith("*") and -1 or 1)
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label = escape("\r".join(labels))
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e.set_label(label)
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return edges[edge_tuple]
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for host, asmaps in data.iteritems():
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if "DOMAIN" in app.config:
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add_node(host, label= "%s\r%s" % (host.upper(), app.config["DOMAIN"].upper()), shape="box", fillcolor="#F5A9A9")
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else:
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add_node(host, label= "%s" % (host.upper()), shape="box", fillcolor="#F5A9A9")
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as_number = app.config["AS_NUMBER"].get(host, None)
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if as_number:
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node = add_node(as_number, fillcolor="#F5A9A9")
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edge = add_edge(as_number, nodes[host])
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edge.set_color("red")
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edge.set_style("bold")
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#colors = [ "#009e23", "#1a6ec1" , "#d05701", "#6f879f", "#939a0e", "#0e9a93", "#9a0e85", "#56d8e1" ]
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previous_as = None
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hosts = data.keys()
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for host, asmaps in data.iteritems():
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first = True
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for asmap in asmaps:
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previous_as = host
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color = "#%x" % random.randint(0, 16777215)
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hop = False
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hop_label = ""
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for _as in asmap:
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if _as == previous_as:
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if not prepend_as.get(_as, None):
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prepend_as[_as] = {}
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if not prepend_as[_as].get(host, None):
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prepend_as[_as][host] = {}
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if not prepend_as[_as][host].get(asmap[0], None):
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prepend_as[_as][host][asmap[0]] = 1
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prepend_as[_as][host][asmap[0]] += 1
|
|
continue
|
|
|
|
if not hop:
|
|
hop = True
|
|
if _as not in hosts:
|
|
hop_label = _as
|
|
if first:
|
|
hop_label = hop_label + "*"
|
|
continue
|
|
else:
|
|
hop_label = ""
|
|
|
|
if _as == asmap[-1]:
|
|
add_node(_as, fillcolor="#F5A9A9", shape="box", )
|
|
else:
|
|
add_node(_as, fillcolor=(first and "#F5A9A9" or "white"), )
|
|
if hop_label:
|
|
edge = add_edge(nodes[previous_as], nodes[_as], label=hop_label, fontsize="7")
|
|
else:
|
|
edge = add_edge(nodes[previous_as], nodes[_as], fontsize="7")
|
|
|
|
hop_label = ""
|
|
|
|
if first or _as == asmap[-1]:
|
|
edge.set_style("bold")
|
|
edge.set_color("red")
|
|
elif edge.get_style() != "bold":
|
|
edge.set_style("dashed")
|
|
edge.set_color(color)
|
|
|
|
previous_as = _as
|
|
first = False
|
|
|
|
for _as in prepend_as:
|
|
for n in set([ n for h, d in prepend_as[_as].iteritems() for p, n in d.iteritems() ]):
|
|
graph.add_edge(pydot.Edge(*(_as, _as), label=" %dx" % n, color="grey", fontcolor="grey"))
|
|
|
|
fmt = request.args.get('fmt', 'png')
|
|
#response = Response("<pre>" + graph.create_dot() + "</pre>")
|
|
if fmt == "png":
|
|
response = Response(graph.create_png(), mimetype='image/png')
|
|
elif fmt == "svg":
|
|
response = Response(graph.create_svg(), mimetype='image/svg+xml')
|
|
else:
|
|
abort(400, "Incorrect format")
|
|
response.headers['Last-Modified'] = datetime.now()
|
|
response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0, max-age=0'
|
|
response.headers['Pragma'] = 'no-cache'
|
|
response.headers['Expires'] = '-1'
|
|
return response
|
|
|
|
|
|
|
|
def build_as_tree_from_raw_bird_ouput(host, proto, text):
|
|
"""Extract the as path from the raw bird "show route all" command"""
|
|
|
|
path = None
|
|
paths = []
|
|
net_dest = None
|
|
peer_protocol_name = ""
|
|
for line in text:
|
|
line = line.strip()
|
|
|
|
expr = re.search(r'(.*)unicast\s+\[(\w+)\s+', line)
|
|
if expr:
|
|
if expr.group(1).strip():
|
|
net_dest = expr.group(1).strip()
|
|
peer_protocol_name = expr.group(2).strip()
|
|
|
|
expr2 = re.search(r'(.*)via\s+([0-9a-fA-F:\.]+)\s+on\s+\S+(\s+\[(\w+)\s+)?', line)
|
|
if expr2:
|
|
if path:
|
|
path.append(net_dest)
|
|
paths.append(path)
|
|
path = None
|
|
|
|
if expr2.group(1).strip():
|
|
net_dest = expr2.group(1).strip()
|
|
|
|
peer_ip = expr2.group(2).strip()
|
|
if expr2.group(4):
|
|
peer_protocol_name = expr2.group(4).strip()
|
|
# Check if via line is a internal route
|
|
for rt_host, rt_ips in app.config["ROUTER_IP"].iteritems():
|
|
# Special case for internal routing
|
|
if peer_ip in rt_ips:
|
|
path = [rt_host]
|
|
break
|
|
else:
|
|
# ugly hack for good printing
|
|
path = [ peer_protocol_name ]
|
|
# path = ["%s\r%s" % (peer_protocol_name, get_as_name(get_as_number_from_protocol_name(host, proto, peer_protocol_name)))]
|
|
|
|
expr3 = re.search(r'(.*)unreachable\s+\[(\w+)\s+', line)
|
|
if expr3:
|
|
if path:
|
|
path.append(net_dest)
|
|
paths.append(path)
|
|
path = None
|
|
|
|
if path is None:
|
|
path = [ expr3.group(2).strip() ]
|
|
|
|
if expr3.group(1).strip():
|
|
net_dest = expr3.group(1).strip()
|
|
|
|
if line.startswith("BGP.as_path:"):
|
|
ASes = line.replace("BGP.as_path:", "").strip().split(" ")
|
|
if path:
|
|
path.extend(ASes)
|
|
else:
|
|
path = ASes
|
|
|
|
if path:
|
|
path.append(net_dest)
|
|
paths.append(path)
|
|
|
|
return paths
|
|
|
|
|
|
def show_route(request_type, hosts, proto):
|
|
expression = get_query()
|
|
if not expression:
|
|
abort(400)
|
|
|
|
set_session(request_type, hosts, proto, expression)
|
|
|
|
bgpmap = request_type.endswith("bgpmap")
|
|
|
|
all = (request_type.endswith("detail") and " all" or "")
|
|
if bgpmap:
|
|
all = " all"
|
|
|
|
if request_type.startswith("adv"):
|
|
command = "show route " + expression.strip()
|
|
if bgpmap and not command.endswith("all"):
|
|
command = command + " all"
|
|
elif request_type.startswith("where"):
|
|
command = "show route where net ~ [ " + expression + " ]" + all
|
|
else:
|
|
mask = ""
|
|
if len(expression.split("/")) == 2:
|
|
expression, mask = (expression.split("/"))
|
|
|
|
if not mask and proto == "ipv4":
|
|
mask = "32"
|
|
if not mask and proto == "ipv6":
|
|
mask = "128"
|
|
if not mask_is_valid(mask):
|
|
return error_page("mask %s is invalid" % mask)
|
|
|
|
if proto == "ipv6" and not ipv6_is_valid(expression):
|
|
try:
|
|
expression = resolve(expression, "AAAA")
|
|
except:
|
|
return error_page("%s is unresolvable or invalid for %s" % (expression, proto))
|
|
if proto == "ipv4" and not ipv4_is_valid(expression):
|
|
try:
|
|
expression = resolve(expression, "A")
|
|
except:
|
|
return error_page("%s is unresolvable or invalid for %s" % (expression, proto))
|
|
|
|
if mask:
|
|
expression += "/" + mask
|
|
|
|
command = "show route for " + expression + all
|
|
|
|
detail = {}
|
|
errors = []
|
|
for host in hosts.split("+"):
|
|
ret, res = bird_command(host, proto, command)
|
|
res = res.split("\n")
|
|
|
|
if ret is False:
|
|
errors.append("%s" % res)
|
|
continue
|
|
|
|
if len(res) <= 1:
|
|
errors.append("%s: bird command failed with error, %s" % (host, "\n".join(res)))
|
|
continue
|
|
|
|
if bgpmap:
|
|
detail[host] = build_as_tree_from_raw_bird_ouput(host, proto, res)
|
|
else:
|
|
detail[host] = add_links(res)
|
|
|
|
if bgpmap:
|
|
detail = base64.b64encode(json.dumps(detail))
|
|
|
|
return render_template((bgpmap and 'bgpmap.html' or 'route.html'), detail=detail, command=command, expression=expression, errors=errors)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
app.run(app.config.get("BIND_IP", "0.0.0.0"), app.config.get("BIND_PORT", 5000))
|