#!/usr/bin/python3
# -*- coding: utf-8 -*-
# vim: ts=4
###
#
# Copyright (c) 2012 Mehdi Abaakouk
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#
###
import base64
from datetime import datetime
import memcache
import subprocess
import logging
from logging.handlers import TimedRotatingFileHandler
import re
from urllib.request import urlopen
from urllib.parse import quote, unquote
import json
import random
from toolbox import mask_is_valid, ip_is_valid, ipv6_is_valid, ipv4_is_valid, resolve, resolve_any, save_cache_pickle, load_cache_pickle, unescape
#from xml.sax.saxutils import escape
import pydot
from flask import Flask, render_template, jsonify, redirect, session, request, abort, Response, Markup
app = Flask(__name__)
app.config.from_pyfile('lg.cfg')
app.secret_key = app.config["SESSION_KEY"]
app.debug = app.config["DEBUG"]
file_handler = TimedRotatingFileHandler(filename=app.config["LOG_FILE"], when="midnight")
file_handler.setLevel(getattr(logging, app.config["LOG_LEVEL"].upper()))
app.logger.addHandler(file_handler)
memcache_server = app.config.get("MEMCACHE_SERVER", "127.0.0.1:11211")
memcache_expiration = int(app.config.get("MEMCACHE_EXPIRATION", "1296000")) # 15 days by default
mc = memcache.Client([memcache_server])
def get_asn_from_as(n):
asn_zone = app.config.get("ASN_ZONE", False)
# don't generate spurious (and potentially slow) lookups if ASN_ZONE not defined in config
if asn_zone:
try:
data = resolve("AS%s.%s" % (n, asn_zone) ,"TXT").replace("'","").replace('"','')
except:
return False
return [ field.strip() for field in data.split("|") ]
else:
return False
def add_links(text):
"""Browser a string and replace ipv4, ipv6, as number, with a
whois link """
if type(text) in [str, str]:
text = text.split("\n")
ret_text = []
for line in text:
# Some heuristic to create link
if line.strip().startswith("BGP.as_path:") or \
line.strip().startswith("Neighbor AS:"):
ret_text.append(re.sub(r'(\d+)', r'<a href="/whois?q=\1" class="whois">\1</a>', line))
else:
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)
line = re.sub(r'AS(\d+)', r'<a href="/whois?q=\1" class="whois">AS\1</a>', line)
line = re.sub(r'(\d+\.\d+\.\d+\.\d+)', r'<a href="/whois?q=\1" class="whois">\1</a>', line)
if len(request.path) >= 2:
hosts = "/".join(request.path.split("/")[2:])
else:
hosts = "/"
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)
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)
ret_text.append(line)
return "\n".join(ret_text)
def set_session(request_type, hosts, proto, request_args):
""" Store all data from user in the user session """
session.permanent = True
session.update({
"request_type": request_type,
"hosts": hosts,
"proto": proto,
"request_args": request_args,
})
history = session.get("history", [])
# erase old format history
if type(history) != type(list()):
history = []
t = (hosts, proto, request_type, request_args)
if t in history:
del history[history.index(t)]
history.insert(0, t)
session["history"] = history[:20]
def whois_command(query):
server = []
if app.config.get("WHOIS_SERVER", ""):
server = [ "-h", app.config.get("WHOIS_SERVER") ]
return subprocess.Popen(['whois'] + server + [query], stdout=subprocess.PIPE).communicate()[0].decode('utf-8', 'ignore')
def bird_command(host, proto, query):
"""Alias to bird_proxy for bird service"""
if app.config.get("UNIFIED_DAEMON", False):
return bird_proxy(host, app.config.get("PROTO_DEFAULT", "ipv4"), "bird", query)
else:
return bird_proxy(host, proto, "bird", query)
def bird_proxy(host, proto, service, query):
"""Retreive data of a service from a running lgproxy on a remote node
First and second arguments are the node and the port of the running lgproxy
Third argument is the service, can be "traceroute" or "bird"
Last argument, the query to pass to the service
return tuple with the success of the command and the returned data
"""
path = ""
if proto == "ipv6":
path = service + "6"
elif proto == "ipv4":
path = service
proxyHost = app.config["PROXY"].get(host, "")
if isinstance(proxyHost, int):
proxyHost = "%s:%s" % (host, proxyHost)
if not proxyHost:
return False, 'Host "%s" invalid' % host
elif not path:
return False, 'Proto "%s" invalid' % proto
else:
url = "http://%s/%s?q=%s" % (proxyHost, path, quote(query))
proxy_timeout = app.config["PROXY_TIMEOUT"].get(service, 60)
try:
f = urlopen(url, None, proxy_timeout)
resultat = f.read().decode('utf-8')
status = True # retreive remote status
except IOError:
resultat = "Failed retreive url: %s" % url
status = False
return status, resultat
@app.context_processor
def inject_commands():
commands = [
("traceroute", "traceroute ..."),
("summary", "show protocols"),
("detail", "show protocols ... all"),
("prefix", "show route for ..."),
("prefix_detail", "show route for ... all"),
("prefix_bgpmap", "show route for ... (bgpmap)"),
("where", "show route where net ~ [ ... ]"),
("where_detail", "show route where net ~ [ ... ] all"),
("where_bgpmap", "show route where net ~ [ ... ] (bgpmap)"),
("adv", "show route ..."),
("adv_bgpmap", "show route ... (bgpmap)"),
]
commands_dict = {}
for id, text in commands:
commands_dict[id] = text
return dict(commands=commands, commands_dict=commands_dict)
@app.context_processor
def inject_all_host():
return dict(all_hosts="+".join(list(app.config["PROXY"].keys())))
@app.route("/")
def hello():
if app.config.get("UNIFIED_DAEMON", False):
return redirect("/summary/all")
else:
return redirect("/summary/all/%s" % app.config.get("PROTO_DEFAULT", "ipv4"))
def error_page(text):
return render_template('error.html', errors=[text]), 500
@app.errorhandler(400)
def incorrect_request(e):
return render_template('error.html', warnings=["The server could not understand the request"]), 400
@app.errorhandler(404)
def page_not_found(e):
return render_template('error.html', warnings=["The requested URL was not found on the server."]), 404
def get_query():
q = unquote(request.args.get('q', '').strip())
return q
@app.route("/whois")
def whois():
query = get_query()
if not query:
abort(400)
try:
asnum = int(query)
query = "as%d" % asnum
except:
m = re.match(r"[\w\d-]*\.(?P<domain>[\d\w-]+\.[\d\w-]+)$", query)
if m:
query = query.groupdict()["domain"]
output = whois_command(query).replace("\n", "<br>")
return jsonify(output=output, title=query)
SUMMARY_UNWANTED_PROTOS = ["Kernel", "Static", "Device", "BFD", "Direct"]
@app.route("/summary/<hosts>")
@app.route("/summary/<hosts>/<proto>")
def summary(hosts, proto="ipv4"):
set_session("summary", hosts, proto, "")
command = "show protocols"
summary = {}
errors = []
hosts = hosts.split("+")
if hosts == ["all"]:
hosts = app.config["PROXY"].keys()
for host in hosts:
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
data = []
for line in res[1:]:
line = line.strip()
if line and (line.split() + [""])[1] not in SUMMARY_UNWANTED_PROTOS:
split = line.split()
if len(split) >= 5:
props = dict()
props["name"] = split[0]
props["proto"] = split[1]
props["table"] = split[2]
props["state"] = split[3]
props["since"] = split[4]
if len(split) > 5:
# if bird is configured for 'timeformat protocol iso long'
# then the 5th column contains the time, rather than info
match = re.match(r'\d\d:\d\d:\d\d', split[5])
if match:
props["info"] = ' '.join(split[6:]) if len(split) > 6 else ""
else:
props["info"] = ' '.join(split[5:])
else:
props["info"] = ""
data.append(props)
else:
app.logger.warning("couldn't parse: %s", line)
summary[host] = data
return render_template('summary.html', summary=summary, command=command, errors=errors)
@app.route("/detail/<hosts>")
@app.route("/detail/<hosts>/<proto>")
def detail(hosts, proto="ipv4"):
name = get_query()
if not name:
abort(400)
set_session("detail", hosts, proto, name)
command = "show protocols all %s" % name
detail = {}
errors = []
hosts = hosts.split("+")
if hosts == ["all"]:
hosts = app.config["PROXY"].keys()
for host in hosts:
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
detail[host] = {"status": res[1], "description": add_links(res[2:])}
return render_template('detail.html', detail=detail, command=command, errors=errors)
@app.route("/traceroute/<hosts>")
@app.route("/traceroute/<hosts>/<proto>")
def traceroute(hosts, proto="ipv4"):
q = get_query()
if not q:
abort(400)
set_session("traceroute", hosts, proto, q)
if app.config.get("UNIFIED_DAEMON", False):
if not ip_is_valid(q):
try:
if app.config.get("UNIFIED_TRACEROUTE_IPV6", True):
q = resolve_any(q)
else:
q = resolve(q, "A")
except:
return error_page("%s is unresolvable" % q)
if ipv6_is_valid(q):
proto = "ipv6"
else:
proto = "ipv4"
else:
if proto == "ipv6" and not ipv6_is_valid(q):
try:
q = resolve(q, "AAAA")
except:
return error_page("%s is unresolvable or invalid for %s" % (q, proto))
if proto == "ipv4" and not ipv4_is_valid(q):
try:
q = resolve(q, "A")
except:
return error_page("%s is unresolvable or invalid for %s" % (q, proto))
errors = []
infos = {}
hosts = hosts.split("+")
if hosts == ["all"]:
hosts = app.config["PROXY"].keys()
for host in hosts:
status, resultat = bird_proxy(host, proto, "traceroute", q)
if status is False:
errors.append("%s" % resultat)
continue
infos[host] = add_links(resultat)
return render_template('traceroute.html', infos=infos, errors=errors)
@app.route("/adv/<hosts>")
@app.route("/adv/<hosts>/<proto>")
def show_route_filter(hosts, proto="ipv4"):
return show_route("adv", hosts, proto)
@app.route("/adv_bgpmap/<hosts>")
@app.route("/adv_bgpmap/<hosts>/<proto>")
def show_route_filter_bgpmap(hosts, proto="ipv4"):
return show_route("adv_bgpmap", hosts, proto)
@app.route("/where/<hosts>")
@app.route("/where/<hosts>/<proto>")
def show_route_where(hosts, proto="ipv4"):
return show_route("where", hosts, proto)
@app.route("/where_detail/<hosts>")
@app.route("/where_detail/<hosts>/<proto>")
def show_route_where_detail(hosts, proto="ipv4"):
return show_route("where_detail", hosts, proto)
@app.route("/where_bgpmap/<hosts>")
@app.route("/where_bgpmap/<hosts>/<proto>")
def show_route_where_bgpmap(hosts, proto="ipv4"):
return show_route("where_bgpmap", hosts, proto)
@app.route("/prefix/<hosts>")
@app.route("/prefix/<hosts>/<proto>")
def show_route_for(hosts, proto="ipv4"):
return show_route("prefix", hosts, proto)
@app.route("/prefix_detail/<hosts>")
@app.route("/prefix_detail/<hosts>/<proto>")
def show_route_for_detail(hosts, proto="ipv4"):
return show_route("prefix_detail", hosts, proto)
@app.route("/prefix_bgpmap/<hosts>")
@app.route("/prefix_bgpmap/<hosts>/<proto>")
def show_route_for_bgpmap(hosts, proto="ipv4"):
return show_route("prefix_bgpmap", hosts, proto)
def get_as_name(_as):
"""return a string that contain the as number following by the as name
It's the use whois database informations
# Warning, the server can be blacklisted from ripe is too many requests are done
"""
if not _as:
return "AS?????"
if not _as.isdigit():
return _as.strip()
name = mc.get(str('lg_%s' % _as))
if not name:
app.logger.info("asn for as %s not found in memcache", _as)
asn_result = get_asn_from_as(_as)
if asn_result:
name = asn_result[-1].replace(" ","\r",1)
mc.set(str("lg_%s" % _as), str(name), memcache_expiration)
else:
return "AS%s" % (_as)
return "AS%s | %s" % (_as, name)
def get_as_number_from_protocol_name(host, proto, protocol):
ret, res = bird_command(host, proto, "show protocols all %s" % protocol)
re_asnumber = re.search("Neighbor AS:\s*(\d*)", res)
if re_asnumber:
return re_asnumber.group(1)
else:
return "?????"
@app.route("/bgpmap/")
def show_bgpmap():
"""return a bgp map in a png file, from the json tree in q argument"""
data = get_query()
if not data:
abort(400)
data = base64.b64decode(data)
data = json.loads(data.decode('utf-8'))
graph = pydot.Dot('BGPMAP', graph_type='digraph')
nodes = {}
edges = {}
prepend_as = {}
def escape(label):
label = label.replace("&", "&")
label = label.replace(">", ">")
label = label.replace("<", "<")
return label
def add_node(_as, **kwargs):
if _as not in nodes:
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>>"
nodes[_as] = pydot.Node(_as, style="filled", fontsize="10", **kwargs)
graph.add_node(nodes[_as])
return nodes[_as]
def add_edge(_previous_as, _as, **kwargs):
kwargs["splines"] = "true"
force = kwargs.get("force", False)
edge_tuple = (_previous_as, _as)
if force or edge_tuple not in edges:
edge = pydot.Edge(*edge_tuple, **kwargs)
graph.add_edge(edge)
edges[edge_tuple] = edge
elif "label" in kwargs and kwargs["label"]:
e = edges[edge_tuple]
label_without_star = kwargs["label"].replace("*", "")
if e.get_label() is not None:
labels = e.get_label().split("\r")
else:
return edges[edge_tuple]
if "%s*" % label_without_star not in labels:
labels = [ kwargs["label"] ] + [ l for l in labels if not l.startswith(label_without_star) ]
labels = sorted(labels, cmp=lambda x,y: x.endswith("*") and -1 or 1)
label = escape("\r".join(labels))
e.set_label(label)
return edges[edge_tuple]
for host, asmaps in data.items():
add_node(host, label= "%s\r%s" % (host.upper(), app.config["DOMAIN"].upper()), shape="box", fillcolor="#F5A9A9")
as_number = app.config["AS_NUMBER"].get(host, None)
if as_number:
node = add_node(as_number, fillcolor="#F5A9A9")
edge = add_edge(as_number, nodes[host])
edge.set_color("red")
edge.set_style("bold")
#colors = [ "#009e23", "#1a6ec1" , "#d05701", "#6f879f", "#939a0e", "#0e9a93", "#9a0e85", "#56d8e1" ]
previous_as = None
hosts = list(data.keys())
for host, asmaps in data.items():
first = True
for asmap in asmaps:
previous_as = host
color = "#%x" % random.randint(0, 16777215)
hop = False
hop_label = ""
for _as in asmap:
if _as == previous_as:
prepend_as[_as] = prepend_as.get(_as, 1) + 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 = ""
add_node(_as, fillcolor=("white"))
if first:
nodes[_as].set_fillcolor("#F5A9A9")
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:
edge.set_style("bold")
edge.set_color("red")
elif edge.get_color() != "red":
edge.set_style("dashed")
edge.set_color(color)
previous_as = _as
first = False
if previous_as:
node = add_node(previous_as)
node.set_shape("box")
for _as in prepend_as:
graph.add_edge(pydot.Edge(*(_as, _as), label=" %dx" % prepend_as[_as], 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
for line in text:
line = line.strip()
# check for bird2 style line containing protocol name
# matches: ... unicast_[(protocol)_ ...
b2_unicast_line = re.search(r'(.*)unicast\s+\[(\w+)\s+', line)
if b2_unicast_line:
# save the net_dest and protocol name for later
if b2_unicast_line.group(1).strip():
net_dest = b2_unicast_line.group(1).strip()
peer_protocol_name = b2_unicast_line.group(2).strip()
peer_match = False
# check line for bird1 style line
# matches: ___via_(next hop ip addr)_on_(iface)_[(protocol)_ ...
b1_peer_line = re.search(r'(.*)via\s+([0-9a-fA-F:\.]+)\s+on.*\[(\w+)\s+', line)
if b1_peer_line:
# save the net_dest, peer and protocol name for later
if b1_peer_line.group(1).strip():
net_dest = b1_peer_line.group(1).strip()
peer_ip = b1_peer_line.group(2).strip()
peer_protocol_name = b1_peer_line.group(3).strip()
# flag that a match was found
peer_match = True
else:
# if this wasn't a bird1 style peer line, then check for a bird2
# style line instead. Doing the check in the else clause prevents
# falsely matching bird1 lines
# matches: _via_(next hop address)
b2_peer_line = re.search(r'via\s+([0-9a-fA-F:\.]+)', line)
if b2_peer_line:
peer_ip = b2_peer_line.group(1).strip()
# flag that a match was found
peer_match = True
if peer_match:
# common code for when either a bird1 or bird2 peer line was found
if path:
path.append(net_dest)
paths.append(path)
path = None
# Check if via line is a internal route
for rt_host, rt_ips in app.config["ROUTER_IP"].items():
# Special case for internal routing
if peer_ip in rt_ips:
paths.append([peer_protocol_name, rt_host])
path = None
break
else:
path = [ peer_protocol_name ]
# check for unreachable routes (common for bird1 & 2)
# matches: ...unreachable_[(protocol)_
unreachable_line = re.search(r'(.*)unreachable\s+\[(\w+)\s+', line)
if unreachable_line:
if path:
path.append(net_dest)
paths.append(path)
path = None
if unreachable_line.group(1).strip():
net_dest = unreachable_line.group(1).strip()
# check for on-link routes
onlink_line = re.search(r'^dev', line)
if onlink_line:
paths.append([peer_protocol_name, net_dest])
path = None
if line.startswith("BGP.as_path:") and 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 app.config.get("UNIFIED_DAEMON", False):
if not ip_is_valid(expression):
try:
expression = resolve_any(expression)
except:
return error_page("%s is unresolvable" % expression)
if not mask and ipv4_is_valid(expression):
mask = "32"
if not mask and ipv6_is_valid(expression):
mask = "128"
if not mask_is_valid(mask):
return error_page("mask %s is invalid" % mask)
else:
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 = []
hosts = hosts.split("+")
if hosts == ["all"]:
hosts = list(app.config["PROXY"].keys())
allhosts = hosts[:]
for host in allhosts:
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)
#for internal routes via hosts not selected
#add them to the list, but only show preferred route
if host not in hosts:
detail[host] = detail[host][:1]
for path in detail[host]:
if len(path) == 2:
if (path[1] not in allhosts) and (path[1] in app.config["PROXY"]):
allhosts.append(path[1])
else:
detail[host] = add_links(res)
if bgpmap:
# in python3 b64encode() encodes a byte-like object in to bytes
# so the json string needs to be encoded to bytes and then the
# base64 result decoded back to a string again
detail = json.dumps(detail)
detail = base64.b64encode(detail.encode('utf-8'))
detail = detail.decode('utf-8')
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))