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#!/usr/bin/env python3
## \file
# \brief CNC TXT REC set up script
# Copyright (c) 2019-2022 David Timber <dxdt@dev.snart.me>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import sys
import base64
import prne_txtrec
import getopt
# Error definitions
HOOK_ERRORS = {
"NOT_IMPL": {
"msg": "not implemented",
"ec": 1
},
"AWS_NO_BOTO3": {
"msg": "Please install Boto3 for AWS hook",
"ec": 1
},
"INV_ARG": {
"msg": "invalid argument",
"ec": 2
}
}
BYTES_PER_RR = 189
def mktxtrr (cnt: int, suffix: str):
return "%08u" % (cnt) + suffix
def main_aws (param: dict):
"""AWS hook main function"""
zone_id = param["zone_id"];
if zone_id is None:
sys.stderr.writelines([
"--zone-id required.\n",
"Run '{0} --help' for help.\n".format(sys.argv[0])
])
exit(2)
head_rec = param["head_rec"]
suffix = param["suffix"]
ttl = param["ttl"]
if ttl is None: ttl = 3600
try:
import boto3
except ModuleNotFoundError as e:
prne_txtrec.handle_err(HOOK_ERRORS["AWS_NO_BOTO3"], e)
client = boto3.client("route53")
ins_q = [] # List of RRs to be inserted
cnt = 0
# process the queued request and clear the queue
def flush_q ():
prne_txtrec.change_all(client, zone_id, 'UPSERT', ins_q)
ins_q.clear()
while True:
b = sys.stdin.buffer.read(BYTES_PER_RR)
if not b: # Assume that EOF is reached
break
ins_q.append({
'Name': mktxtrr(cnt, suffix),
'Type': 'TXT',
'TTL': ttl,
'ResourceRecords': [
{ 'Value': '"' + base64.b64encode(b).decode('ascii') + '"' }
]
})
cnt += 1
if len(ins_q) >= prne_txtrec.AWS_MAX_ITEMS:
flush_q()
flush_q()
head_rr = mktxtrr(cnt, suffix)
# insert the head rec
prne_txtrec.change_all(
client,
zone_id,
'UPSERT',
[{
'Name': head_rec,
'Type': 'TXT',
'TTL': ttl,
'ResourceRecords': [
{ 'Value': '"' + head_rr + '"' }
]
}])
def main_dnsmasq (param: dict):
head_rec = param["head_rec"]
suffix = param["suffix"]
ttl = param["ttl"]
if ttl is None: ttl_str = ""
else: ttl_str = ",%us" % ttl
cnt = 0
while True:
b = sys.stdin.buffer.read(BYTES_PER_RR)
if not b: # EOF
break
name = mktxtrr(cnt, suffix)
l = '''txt-record={name},"{val}"{ttl}'''.format(
name = name,
val = base64.b64encode(b).decode('ascii'),
ttl = ttl_str
)
cnt += 1
print(l)
head_rr = mktxtrr(cnt, suffix)
l = '''txt-record={name},"{val}"{ttl}'''.format(
name = head_rec,
val = head_rr,
ttl = ttl_str
)
print(l)
HOOKS = {
"aws": main_aws,
"dnsmasq": main_dnsmasq
}
USAGE_STR = '''Upload or output Proone CNC TXT DNS records
Usage: {arg0} <options>
Options:
-h, --help print this message and exit normally
-V, --version print version info and exit normally
--hook=<str> (required) use the hook. See below for available hooks
--head=<str> (required) set the name of the header CNC TXT record
--suffix=<str> (required) set the suffix of the data CNC TXT record(s)
--zond-id=<str> set the zone id. Required for AWS hook
--ttl=<uint> specify TTL of the records
Hooks:
{hooks}
'''.format(
arg0 = sys.argv[0],
hooks = " ".join(k + "\n" for k in HOOKS.keys())
)
def print_usage (out):
out.write(USAGE_STR)
opts, args = getopt.getopt(
sys.argv[1:],
"hV",
[
"help",
"version",
"hook=",
"head=",
"suffix=",
"zone-id=",
"ttl="
])
opts = dict(opts)
if set(opts.keys()).intersection(set([ "--help", "-h", "--version", "-V" ])):
if "--version" in opts or "-V" in opts:
print("prne-txtrec version: " + prne_txtrec.VERSION)
if "--help" in opts or "-h" in opts:
print_usage(sys.stdout)
exit(0)
# process argv
try:
ARGV_DICT = {}
ARGV_DICT["hook"] = opts["--hook"]
ARGV_DICT["head_rec"] = opts["--head"]
ARGV_DICT["suffix"] = opts["--suffix"]
ARGV_DICT["zone_id"] = opts.get("--zone-id")
ARGV_DICT["ttl"] = opts.get("--ttl")
if ARGV_DICT["ttl"]:
ARGV_DICT["ttl"] = int(ARGV_DICT["ttl"])
if ARGV_DICT["ttl"] not in range(0, 2147483648):
prne_txtrec.handle_err(
HOOK_ERRORS["INV_ARG"],
None,
ARGV_DICT["ttl"])
except KeyError as e:
sys.stderr.writelines([
e.args[0] + " option required.\n",
"Run '{0} --help' for help.\n".format(sys.argv[0])
])
exit(2)
# call the function
try:
HOOKS[ARGV_DICT["hook"]](ARGV_DICT)
except KeyError:
prne_txtrec.handle_err(HOOK_ERRORS["NOT_IMPL"], None, ARGV_DICT["hook"])
exit(0)
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