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#!/usr/bin/env python3
from re import search, findall
from subprocess import Popen, PIPE
from dnstest.context import Context
from dnstest.utils import *
import dnstest.params as params
# Use one instance per zone, don't combine multiple zone updates (could cause UB).
class Knsupdate:
def __init__(self, zone, tsig=None):
self.zone = zone
self.tsig = tsig
self.output = ""
def add(self, owner, ttl, rtype, rdata):
self.output += f"update add {owner}"
if ttl:
self.output += f" {ttl}"
self.output += f" {rtype} {rdata}\n"
def delete(self, owner, *args):
self.output += f"update delete {owner}"
if len(args) >= 1:
rtype = args[0]
if rtype != 'ANY':
self.output += f" {rtype}"
if len(args) >= 2:
rdata = args[1]
self.output += f" {rdata}"
self.output += "\n"
def present(self, owner, *args):
if len(args) >= 1:
self.output += f"prereq yxrrset {owner}"
rtype = args[0]
self.output += f" {rtype}"
if len(args) >= 2:
rdata = args[1]
self.output += f" {rdata}"
else:
self.output += f"prereq yxdomain {owner}"
self.output += "\n"
def absent(self, owner, *args):
if len(args) >= 1:
self.output += f"prereq nxrrset {owner}"
rtype = args[0]
self.output += f" {rtype}"
else:
self.output += f"prereq nxdomain {owner}"
self.output += "\n"
def send(self, addr, port, proto):
# Binary with arguments
cmdline = [params.knsupdate_bin]
if proto is Proto.TCP:
cmdline += ["-T"]
elif proto is Proto.TLS:
cmdline += ["-S"]
elif proto is Proto.QUIC:
cmdline += ["-Q"]
if self.tsig:
cmdline += ["-y", f"{self.tsig.alg}:{self.tsig.name}:{self.tsig.key}"]
# Mandatory header
header = f"server {addr} {port}\n"
header += f"zone {self.zone}\n"
# Run process
cmd = Popen(cmdline, stdin=PIPE, stdout=PIPE, stderr=PIPE, universal_newlines=True)
(stdout, stderr) = cmd.communicate(header + self.output + "show\nsend\nanswer\nexit\n")
with open(Context().out_dir + "/knsupdate.out", "a") as outf:
outf.write(' '.join(cmdline))
outf.write("\n" + stdout + "\n")
with open(Context().out_dir + "/knsupdate.err", "a") as errf:
errf.write(stderr)
# Parse RCODE
rcodes = findall(r"status: ([A-Z]+)", stdout)
if len(rcodes) != 2:
raise Failed("Failed to parse RCODE")
rcv_ercode = rcodes[1]
if rcv_ercode != "SERVFAIL" and "reply verification" in stderr:
raise Failed("TSIG issues in DDNS")
self.output = ""
return rcv_ercode
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