homer.py 22 KB
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#!/usr/bin/env python3

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# Homer is a DoH (DNS-over-HTTPS) and DoT (DNS-over-TLS) client. Its
# main purpose is to test DoH and DoT resolvers. Reference site is
# <https://framagit.org/bortzmeyer/homer/> See author, documentation,
# etc, there, or in the README.md included with the distribution.

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# http://pycurl.io/docs/latest
import pycurl

# http://www.dnspython.org/
import dns.message

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# https://github.com/drkjam/netaddr/
import netaddr

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# Octobre 2019: the Python GnuTLS bindings don't work with Python 3. So we use OpenSSL.
# https://www.pyopenssl.org/
# https://pyopenssl.readthedocs.io/
import OpenSSL

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import io
import sys
import base64
import getopt
import urllib.parse
import time
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import socket
import ctypes
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import re
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import os.path
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import hashlib
import base64
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# Values that can be changed from the command line
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dot = False # DoH by default
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verbose = False
insecure = False
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post = False
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head = False
rtype = 'AAAA'
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vhostname = None
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tests = 1 # Number of repeated tests
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ifile = None # Input file
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delay = None
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forceIPv4 = False
forceIPv6 = False
connectTo = None
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# Monitoring plugin only:
host = None
path = None
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# Do not change these
re_host = re.compile(r'^([0-9a-z][0-9a-z-\.]*)|([0-9:]+)|([0-9\.])$')

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# For the monitoring plugin
STATE_OK = 0
STATE_WARNING = 1
STATE_CRITICAL = 2
STATE_UNKNOWN = 3
STATE_DEPENDENT = 4

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def error(msg=None):
    if msg is None:
        msg = "Unknown error"
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    if monitoring:
        print("%s: %s" % (url, msg))
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        sys.exit(STATE_CRITICAL)
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    else:
        print(msg,file=sys.stderr)
        sys.exit(1)
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def usage(msg=None):
    if msg:
        print(msg,file=sys.stderr)
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    print("Usage: %s [--dot] url-or-servername domain-name [DNS type]" % sys.argv[0], file=sys.stderr)
    print("See the README.md for more details.", file=sys.stderr)
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def is_valid_hostname(name):
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    name = canonicalize(name)
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    return re_host.search(name)
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def canonicalize(hostname):
    result = hostname.lower()
    # TODO handle properly the case where it fails with UnicodeError
    # (two consecutive dots for instance) to get a custom exception
    result = result.encode('idna').decode()
    if result[len(result)-1] == '.':
        result = result[:-1]
    return result

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def is_valid_ip_address(addr):
    try:
        baddr = netaddr.IPAddress(addr)
    except netaddr.core.AddrFormatError:
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        return (False, None)
    return (True, baddr.version)
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def is_valid_url(url):
  try:
    result = urllib.parse.urlparse(url) # A very poor validation, many
    # errors (for instance whitespaces, IPv6 address litterals without
    # brackets...) are ignored.
    return (result.scheme=="https" and result.netloc != "")
  except ValueError:
    return False

def get_certificate_san(x509cert):
    san = ""
    ext_count = x509cert.get_extension_count()
    for i in range(0, ext_count):
        ext = x509cert.get_extension(i)
        if "subjectAltName" in str(ext.get_short_name()):
            san = str(ext)
    return san

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# Try one possible name. Names must be already canonicalized.
def match_hostname(hostname, possibleMatch):
    if possibleMatch.startswith("*."): # Wildcard
        base = possibleMatch[1:] # Skip the star
        # RFC 6125 says that we MAY accept left-most labels with
        # wildcards included (foo*bar). We don't do it here.
        try:
            (first, rest) = hostname.split(".", maxsplit=1)
        except ValueError: # One-label name
            rest = hostname
        if rest == base[1:]:
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            return True
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        if hostname == base[1:]:
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            return True
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        return False
    else:
        return hostname == possibleMatch

# Try all the names in the certificate
def validate_hostname(hostname, cert):
    # Complete specification is in RFC 6125. It is long and
    # complicated and I'm not sure we do it perfectly.
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    (is_addr, family) = is_valid_ip_address(hostname)
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    hostname = canonicalize(hostname)
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    for alt_name in get_certificate_san(cert).split(", "):
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        if alt_name.startswith("DNS:") and not is_addr:
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            (start, base) = alt_name.split("DNS:")
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            base = canonicalize(base)
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            found = match_hostname(hostname, base)
            if found:
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                return True
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        elif alt_name.startswith("IP Address:") and is_addr:
            host_i = netaddr.IPAddress(hostname)
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            (start, base) = alt_name.split("IP Address:")
            if base.endswith("\n"):
                base = base[:-1]
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            try:
                base_i = netaddr.IPAddress(base)
            except netaddr.core.AddrFormatError:
                continue # Ignore broken IP addresses in certificates. Are we too liberal?
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            if host_i == base_i:
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                return True
        else:
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            pass # Ignore unknown alternative name types. May be
                 # accept URI alternative names for DoH,
    # According to RFC 6125, we MUST NOT try the Common Name before the Subject Alternative Names.
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    cn = canonicalize(cert.get_subject().commonName)
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    found = match_hostname(hostname, cn)
    if found:
        return True
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    return False

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class Connection:
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    def __init__(self, server, servername=None, connect=None, forceIPv4=False, forceIPv6=False,
                 dot=False, verbose=verbose, insecure=insecure, post=post, head=head):
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        if dot and not is_valid_hostname(server):
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            error("DoT requires a host name or IP address, not \"%s\"" % server)
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        if not dot and not is_valid_url(url):
            error("DoH requires a valid HTTPS URL, not \"%s\"" % server)
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        self.server = server
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        self.servername = servername
        if self.servername is not None:
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            self.check = self.servername
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        else:
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            self.check = self.server
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        self.dot = dot
        self.verbose = verbose
        self.insecure = insecure
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    def __str__(self):
        return self.server
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class ConnectionDoT(Connection):
    def __init__(self, server, servername=None, connect=None, forceIPv4=False, forceIPv6=False,
                 dot=False, verbose=verbose, insecure=insecure, post=post, head=head):
        Connection.__init__(self, server, servername=servername, connect=connect,
                forceIPv4=forceIPv4, forceIPv6=forceIPv6, dot=dot,
                verbose=verbose, insecure=insecure, post=post, head=head)
        if forceIPv4 and forceIPv6:
            raise Exception("Force IPv4 *or* IPv6 but not both")
        (is_addr, family) = is_valid_ip_address(self.server)
        if forceIPv4:
            if is_addr and family == 6:
                raise Exception("You cannot force IPv4 with a litteral IPv6 address (%s)" % self.server)
            family =  socket.AF_INET
        elif forceIPv6:
            if is_addr and family == 4:
                raise Exception("You cannot force IPv6 with a litteral IPv4 address (%s)" % self.server)
            family = socket.AF_INET6
        else:
            family = 0
        self.hasher = hashlib.sha256()
        addrinfo = socket.getaddrinfo(server, 853, family)
        # May be loop over the results of getaddrinfo, to test all
        # the IP addresses? See #13.
        self.sock = socket.socket(addrinfo[0][0], socket.SOCK_STREAM)
        self.addr = addrinfo[0][4]
        if self.verbose:
            print("Connecting to %s ..." % str(self.addr))
        # With typical DoT servers, we *must* use TLS 1.2 (otherwise,
        # do_handshake fails with "OpenSSL.SSL.SysCallError: (-1, 'Unexpected
        # EOF')" Typical HTTP servers are more lax.
        self.context = OpenSSL.SSL.Context(OpenSSL.SSL.TLSv1_2_METHOD)
        if self.insecure:
            self.context.set_verify(OpenSSL.SSL.VERIFY_NONE, lambda *x: True)
        else:
            self.context.set_default_verify_paths()
            self.context.set_verify_depth(4) # Seems ignored
            self.context.set_verify(OpenSSL.SSL.VERIFY_PEER | OpenSSL.SSL.VERIFY_FAIL_IF_NO_PEER_CERT | \
                                    OpenSSL.SSL.VERIFY_CLIENT_ONCE,
                                    lambda conn, cert, errno, depth, preverify_ok: preverify_ok)
        self.session = OpenSSL.SSL.Connection(self.context, self.sock)
        self.session.set_tlsext_host_name(canonicalize(self.check).encode()) # Server Name Indication (SNI)
        self.session.connect((self.addr))
        # TODO We may here have exceptions such as OpenSSL.SSL.ZeroReturnError
        self.session.do_handshake()
        self.cert = self.session.get_peer_certificate()
        # RFC 7858, section 4.2 and appendix A
        self.publickey = self.cert.get_pubkey()
        if verbose:
            print("Certificate #%x for \"%s\", delivered by \"%s\"" % \
                  (self.cert.get_serial_number(),
                   self.cert.get_subject().commonName,
                   self.cert.get_issuer().commonName))
            self.hasher.update(OpenSSL.crypto.dump_publickey(OpenSSL.crypto.FILETYPE_ASN1,
                                                  self.publickey))
            self.digest = self.hasher.digest()
            print("Public key is pin-sha256=\"%s\"" % \
                  base64.standard_b64encode(self.digest).decode())
        if not insecure:
            valid = validate_hostname(self.check, self.cert)
            if not valid:
                error("Certificate error: \"%s\" is not in the certificate" % (self.check))

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    def end(self):
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        self.session.shutdown()
        self.session.close()


class ConnectionDoH(Connection):
    def __init__(self, server, servername=None, connect=None, forceIPv4=False, forceIPv6=False,
                 dot=False, verbose=verbose, insecure=insecure, post=post, head=head):
        Connection.__init__(self, server, servername=servername, connect=connect,
                forceIPv4=forceIPv4, forceIPv6=forceIPv6, dot=dot,
                verbose=verbose, insecure=insecure, post=post, head=head)
        self.post = post
        self.head = head
        self.curl = pycurl.Curl()
        self.url = server
        # Does not work if pycurl was not compiled with nghttp2 (recent Debian
        # packages are OK) https://github.com/pycurl/pycurl/issues/477
        self.curl.setopt(pycurl.HTTP_VERSION, pycurl.CURL_HTTP_VERSION_2)
        self.curl.setopt(pycurl.HTTPHEADER, ["Content-type: application/dns-message"])
        if self.verbose:
            self.curl.setopt(self.curl.VERBOSE, True)
        if self.insecure:
            self.curl.setopt(pycurl.SSL_VERIFYPEER, False)
            self.curl.setopt(pycurl.SSL_VERIFYHOST, False)
        if self.head:
            self.curl.setopt(pycurl.NOBODY, True)
        if self.post:
             self.curl.setopt(pycurl.POST, True)
        if forceIPv4 and forceIPv6:
            raise Exception("Force IPv4 *or* IPv6 but not both")
        if forceIPv4:
            self.curl.setopt(pycurl.IPRESOLVE, pycurl.IPRESOLVE_V4)
        if forceIPv6:
            self.curl.setopt(pycurl.IPRESOLVE, pycurl.IPRESOLVE_V6)
        if connect is not None:
            try:
                binaddress = netaddr.IPAddress(connect)
                if binaddress.version == 4:
                    if forceIPv6:
                        raise Exception("You cannot force the use of IPv6 with a litteral IPv4 address (%s)" % connect)
                    repraddress = connect
                elif binaddress.version == 6:
                    if forceIPv4:
                        raise Exception("You cannot force the use of IPv6 with a litteral IPv4 address (%s)" % connect)
                    repraddress = "[%s]" % connect
                else:
                    raise Exception("%s is not IPv4 and not IPv6" % connect)
            except netaddr.core.AddrFormatError:
                repraddress = connect
            try:
                self.curl.setopt(pycurl.CONNECT_TO, ["::%s:" % repraddress,])
            except AttributeError:
                pass # Probably an old version of libcurl, without CONNECT_TO. It appeared with 7.49.0

    def end(self):
        self.curl.close()

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# Routine doing one actual test. Returns a tuple, first member is a
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# result (boolean indicating success for DoT, HTTP status code for
# DoH), second member is a DNS message (or a string if there is an
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# error), third member is the size of the DNS message (or None if no
# proper response).
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def do_test(connection, qname, qtype=rtype):
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    message = dns.message.make_query(qname, dns.rdatatype.from_text(qtype), use_edns=True, want_dnssec=True)
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    size = None
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    if connection.dot:
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        messagew = message.to_wire()
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        length = len(messagew)
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        id = message.id
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        n = connection.session.send(length.to_bytes(2, byteorder='big') + messagew)
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        buf = connection.session.recv(2)
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        received = int.from_bytes(buf, byteorder='big')
        buf = connection.session.recv(received)
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        response = dns.message.from_wire(buf)
        if response.id != message.id:
            raise Exception("The ID in the answer does not match the one in the query")
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        return (True, response, received)
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    else: # DoH
        message.id = 0 # DoH requests that
        if connection.post:
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            connection.curl.setopt(connection.curl.URL, connection.server)
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            data = message.to_wire()
            connection.curl.setopt(pycurl.POSTFIELDS, data)
        else:
            dns_req = base64.urlsafe_b64encode(message.to_wire()).decode('UTF8').rstrip('=')
            connection.curl.setopt(connection.curl.URL, connection.server + ("?dns=%s" % dns_req))
        buffer = io.BytesIO()
        connection.curl.setopt(connection.curl.WRITEDATA, buffer)
        connection.curl.perform()
        rcode = connection.curl.getinfo(pycurl.RESPONSE_CODE)
        ok = True
        if rcode == 200:
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            ctype = connection.curl.getinfo(pycurl.CONTENT_TYPE)
            if ctype != "application/dns-message":
                response = "Content type of the response (\"%s\") invalid" % ctype
                ok = False
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            else:
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                if not head:
                    body = buffer.getvalue()
                    try:
                        size = len(body)
                        response = dns.message.from_wire(body)
                    except dns.message.TrailingJunk: # Not DNS. Should
                        # not happen for a content type
                        # application/dns-message but who knows?
                        response = "ERROR Not proper DNS data, trailing junk \"%s\"" % body
                        ok = False
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                    except dns.name.BadLabelType: # Not DNS.
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                        response = "ERROR Not proper DNS data (wrong path in the URL?) \"%s\"" % body[:100]
                        ok = False
                else:
                    response = "HEAD successful"
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        else:
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            ok = False
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            body =  buffer.getvalue()
            if len(body) == 0:
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                response = "[No details]"
            else:
                response = body
            buffer.close()
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        return (rcode, response, size)
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# Main program
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me = os.path.basename(sys.argv[0])
monitoring = (me == "check_doh" or me == "check_dot")
if not monitoring:
    name = None
    message = None
    try:
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        optlist, args = getopt.getopt (sys.argv[1:], "hvPkeV:r:f:d:t46",
                                       ["help", "verbose", "dot", "head", "insecure", "POST", "vhost=",
                                        "repeat=", "file=", "delay=", "v4only", "v6only"])
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        for option, value in optlist:
            if option == "--help" or option == "-h":
                usage()
                sys.exit(0)
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            elif option == "--dot" or option == "-t":
                dot = True
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            elif option == "--verbose" or option == "-v":
                verbose = True
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            elif option == "--HEAD" or option == "--head" or option == "-e":
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                head = True
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            elif option == "--POST" or option == "--post" or option == "-P":
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                post = True
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            elif option == "--vhost" or option == "-V":
                vhostname = value
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            elif option == "--insecure" or option == "-k":
                insecure = True
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            elif option == "--repeat" or option == "-r":
                tests = int(value)
                if tests <= 1:
                    error("--repeat needs a value > 1")
            elif option == "--delay" or option == "-d":
                delay = float(value)
                if delay <= 0:
                    error("--delay needs a value > 0")
            elif option == "--file" or option == "-f":
                ifile = value
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            elif option == "-4" or option == "v4only":
                forceIPv4 = True
            elif option == "-6" or option == "v6only":
                forceIPv6 = True
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            else:
                error("Unknown option %s" % option)
    except getopt.error as reason:
        usage(reason)
        sys.exit(1)
    if tests <= 1 and delay is not None:
        error("--delay makes no sense if there is no repetition")
    if post and head:
        usage("POST or HEAD but not both")
        sys.exit(1)
    if dot and (post or head):
        usage("POST or HEAD makes non sense for DoT")
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        sys.exit(1)
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    if ifile is None and (len(args) != 2 and len(args) != 3):
        usage("Wrong number of arguments")
        sys.exit(1)
    if ifile is not None and len(args) != 1:
        usage("Wrong number of arguments (if --file is used, do not indicate the domain name)")
        sys.exit(1)
    url = args[0]
    if ifile is None:
        name = args[1]
        if len(args) == 3:
            rtype = args[2]
else: # Monitoring plugin
    dot = (me == "check_dot")
    name = None
    try:
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        optlist, args = getopt.getopt (sys.argv[1:], "H:n:p:V:t:Pih46")
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        for option, value in optlist:
            if option == "-H":
                host = value
            elif option == "-V":
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                vhostname = value
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            elif option == "-n":
                name = value
            elif option == "-t":
                rtype = value
            elif option == "-p":
                path = value
            elif option == "-P":
                post = True
            elif option == "-h":
                head = True
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            elif option == "-i":
                insecure = True
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            elif option == "-4":
                forceIPv4 = True
            elif option == "-6":
                forceIPv6 = True
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            else:
                # Should never occur, it is trapped by getopt
                print("Unknown option %s" % option)
                sys.exit(STATE_UNKNOWN)
    except getopt.error as reason:
        print("Option parsing problem %s" % reason)
        sys.exit(STATE_UNKNOWN)
    if len(args) > 0:
        print("Too many arguments (\"%s\")" % args)
        sys.exit(STATE_UNKNOWN)
    if host is None or name is None:
        print("Host (-H) and name to lookup (-n) are necessary")
        sys.exit(STATE_UNKNOWN)
    if post and head:
        print("POST or HEAD but not both")
        sys.exit(STATE_UNKNOWN)
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    if dot and (post or head):
        print("POST or HEAD makes no sense for DoT")
        sys.exit(STATE_UNKNOWN)
    if dot and path:
        print("URL path makes no sense for DoT")
        sys.exit(STATE_UNKNOWN)
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    if dot:
        url = host
    else:
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        if vhostname is None or vhostname == host:
            connectTo = None
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            url = "https://%s/" % host
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        else:
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            connectTo = host
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            url = "https://%s/" % vhostname
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        if path is not None:
            if path.startswith("/"):
                path = path[1:]
            url += path
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ok = True
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start = time.time()
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try:
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    if dot and vhostname is not None:
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        extracheck = vhostname
    else:
        extracheck = None
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    if dot:
        conn = ConnectionDoT(url, dot=dot, servername=extracheck, connect=connectTo, verbose=verbose,
                          forceIPv4=forceIPv4, forceIPv6=forceIPv6,
                          insecure=insecure, post=post, head=head)
    else:
        conn = ConnectionDoH(url, dot=dot, servername=extracheck, connect=connectTo, verbose=verbose,
                          forceIPv4=forceIPv4, forceIPv6=forceIPv6,
                          insecure=insecure, post=post, head=head)
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except TimeoutError:
    error("timeout")
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except ConnectionRefusedError:
    error("Connection to server refused")
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if ifile is not None:
    input = open(ifile)
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for i in range (0, tests):
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    if tests > 1:
        print("\nTest %i" % i)
    if ifile is not None:
        line = input.readline()
        if line[:-1] == "":
            error("Not enough data in %s for the %i tests" % (ifile, tests))
        if line.find(' ') == -1:
            name = line[:-1]
            rtype = 'AAAA'
        else:
            (name, rtype) = line.split()
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    (rcode, msg, size) = do_test(conn, name, rtype)
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    if (dot and rcode) or (not dot and rcode == 200):
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        if not monitoring:
            print(msg)
        else:
            if size is not None and size > 0:
                print("%s OK - %s" % (url, "No error for %s/%s, %i bytes received" % (name, rtype, size)))
            else:
                print("%s OK - %s" % (url, "No error"))
            sys.exit(STATE_OK)
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    else:
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        if not monitoring:
            if dot:
                print("Error: %s" % msg, file=sys.stderr)
            else:
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               try:
                   msg = msg.decode()
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               except (UnicodeDecodeError, AttributeError):
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                   pass # Sometimes, msg can be binary, or Latin-1
               print("HTTP error %i: %s" % (rcode, msg), file=sys.stderr)
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        else:
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            if not dot:
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                print("%s HTTP error - %i: %s" % (url, rcode, msg))
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            else:
                print("%s Error - %i: %s" % (url, rcode, msg))
            sys.exit(STATE_CRITICAL)
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        ok = False
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    if tests > 1 and i == 0:
        start2 = time.time()
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    if delay is not None:
        time.sleep(delay)
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stop = time.time()
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if tests > 1:
    extra = ", %.2f ms/request if we ignore the first one" % ((stop-start2)*1000/(tests-1))
else:
    extra = ""
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if not monitoring:
    print("\nTotal elapsed time: %.2f seconds (%.2f ms/request %s)" % (stop-start, (stop-start)*1000/tests, extra))
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if ifile is not None:
    input.close()
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conn.end()
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if ok:
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    if not monitoring:
        sys.exit(0)
    else:
        sys.exit(STATE_OK)
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else:
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    if not monitoring:
        sys.exit(1)
    else:
        sys.exit(STATE_CRITICAL)
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