A Looking Glass implementation in Python3 and Flask. Vet code for security concerns before deploying, this isn't tested for vulnerabilities in any way

lookingglass.py

#!/usr/bin/env python3
from flask import Flask,request,make_response
from shlex import quote
from subprocess import check_output
import socket
from requests import post

app = Flask(__name__)

@app.route('/')
def index():
    return """<form method="post" action="process">
    <input type="text" name="host">
    <select name="service">
        <option value="ping">Ping</option>
        <option value="mtr">MTR</option>
        <option value="bgp">bgp</option>
    </select>
    <input type="submit"></form>
"""

@app.route("/process", methods=["POST"])
def process():
    host,service = request.form.get("host", "8.8.8.8"),request.form.get("service","ping")
    try:
        # Is it an ip?
        _ = socket.inet_aton(host)
    except OSError:
        # Well it's not ipv4,
        try:
            _ = socket.inet_pton(socket.AF_INET6, host)
        except OSError:
            # Not ipv6 either. We'll try resolving dns
            try:
                host = socket.gethostbyname(host)
            except socket.gaierror:
                return "We only support ipv4/ipv6/valid domains\n"
        else:
            pass # host is ipv6
    else:
        pass # host is ipv4
    print("Processing request {},{} from {} {}".format(host, service, request.environ["REMOTE_ADDR"], request.headers.get("User-Agent")))
    if service == "ping":
        resp = make_response(check_output(["ping", "-i", "0.2", "-q", "-c", "4", quote(host)]))
    elif service == "mtr":
        resp = make_response(check_output(["mtr", "-c", "1", "--report-wide", "-m", "60", "-b", quote(host)]))
    elif service == "bgp":
        data = post("http://noc.i3d.net/looking-glass/execute.php", data={"routers": "uslax1-rt001i", "query": "bgp", "parameter": host, "dontlook": ""}).json()["result"][8:-6].strip().replace('</kdb></p><pre class="pre-scrollable">', "\n\n")
        resp = make_response(data)
    else:
        return "oi"
    print(" Completed request {},{} from {} {}".format(host,service, request.environ["REMOTE_ADDR"], request.headers.get("User-Agent")))
    resp.headers["Content-Type"] = "text/plain"
    return resp

if __name__ == "__main__":
    app.run()