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#!/usr/bin/env python3
## \file
# \brief CNC TXT REC delete script
# Copyright (c) 2019-2021 David Timber <mieabby@gmail.com>
#
# 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 re
import prne_txtrec
# regex for seperating the number of data RRs and the suffix from the head TXT
HEAD_TXT_RE = re.compile('"([0-9]{8})(.*)"')
# regex for seperating the index and the suffix from the data TXT
DATA_TXT_RE = re.compile('([0-9]{8})(.*)')
# Error definitions
HOOK_ERRORS = {
"NOT_IMPL": {
"msg": "not implemented",
"ec": 1
},
"AWS_NO_BOTO3": {
"msg": "Please install Boto3 for AWS hook",
"ec": 1
},
"NO_RR": {
"msg": "No RR in the zone specified",
"ec": 1
},
"NO_HEAD_REC": {
"msg": "The head rec not found",
"ec": 1
},
"MULTI_HEAD_REC": {
"msg": "The head rec has multiple TXT values",
"ec": 1
},
"HEAD_REC_INV_FMT": {
"msg": "Invalid format of the head TXT rec value",
"ec": 1
},
}
def main_aws (zone_id: str, head_rec: str):
"""AWS hook main function"""
try:
import boto3
except ModuleNotFoundError as e:
prne_txtrec.handle_err(HOOK_ERRORS["AWS_NO_BOTO3"], e)
client = boto3.client("route53")
del_q = [] # List of RRs to be deleted
# Get the head RR
r = client.list_resource_record_sets(
HostedZoneId = zone_id,
StartRecordName = head_rec,
StartRecordType = "TXT")
rrs = r['ResourceRecordSets']
# Handle general errors
if len(rrs) <= 0:
# No RR in the zone
prne_txtrec.handle_err(HOOK_ERRORS["NO_RR"])
if rrs[0]['Name'].lower() != head_rec:
# If the list does not start with the head rec, which is
# specifically requested, the head rec probably doesn't exist in the
# zone.
prne_txtrec.handle_err(HOOK_ERRORS["NO_HEAD_REC"])
if len(rrs[0]['ResourceRecords']) > 1:
# Multiple RR data. This is a protocol error - the scripts will
# never allow RRs with muiltiple TXT values
prne_txtrec.handle_err(HOOK_ERRORS["MULTI_HEAD_REC"])
head_rr = rrs[0]
# Seperate the number of records and the suffix
head_txt = head_rr['ResourceRecords'][0]['Value']
m = HEAD_TXT_RE.fullmatch(head_txt)
if not m:
prne_txtrec.handle_err(
HOOK_ERRORS["HEAD_REC_INV_FMT"],
None,
head_txt if head_txt.isprintable() else None)
nb_rr = int(m.group(1))
suffix = prne_txtrec.termdot(m.group(2))
# Go through all the records in the zone to delete the records that fall
# into the criteria - suffix and the prefix number in range
# Using these will start the list from the first record. Hopefully, the
# server returns the list in order so that the script does not have to
# visit the other irrelevant RRs in the zone
next_name = "00000000" + suffix
next_type = "TXT"
while len(del_q) in range(0, nb_rr):
r = client.list_resource_record_sets(
HostedZoneId = zone_id,
StartRecordName = next_name,
StartRecordType = next_type)
rrs = r['ResourceRecordSets']
if not rrs:
break
if 'IsTruncated' in r and r['IsTruncated']:
# Set up the tokens for the next iteration
next_name = r['NextRecordName']
next_type = r['NextRecordType']
for rr in rrs:
if rr['Type'] != "TXT":
continue
m = DATA_TXT_RE.fullmatch(rr['Name'])
if not m or m.group(2).lower() != suffix:
continue
if not (int(m.group(1)) in range(0, nb_rr)):
continue
# Matches the criteria. Queue for deletion
del_q.append(rr)
while del_q:
# Delete AWS_MAX_ITEMS RRs at a time as per recommendation
prne_txtrec.change_all(
client,
zone_id,
'DELETE',
del_q[:min(len(del_q),
prne_txtrec.AWS_MAX_ITEMS)])
del del_q[:min(len(del_q), prne_txtrec.AWS_MAX_ITEMS)]
# Finally, delete the head rec
prne_txtrec.change_all(client, zone_id, 'DELETE', [head_rr])
HOOKS = {
"aws": main_aws
}
USAGE_LINES = [
"Usage: " + sys.argv[0] + " <head rec> <hook> <zone id>\n",
"Hooks:\n"
]
for h in HOOKS:
USAGE_LINES.append(" " + h + "\n")
def print_usage (out):
out.writelines(USAGE_LINES)
# proecss argv
try:
ARGV_DICT = {
"head_rec": prne_txtrec.termdot(sys.argv[1].lower()),
"hook": sys.argv[2].lower(),
"zone_id": sys.argv[3]
}
except IndexError:
print_usage(sys.stderr)
exit(1)
# call the function
try:
HOOKS[ARGV_DICT["hook"]](ARGV_DICT["zone_id"], ARGV_DICT["head_rec"])
except KeyError:
prne_txtrec.handle_err(HOOK_ERRORS["NOT_IMPL"], None, ARGV_DICT["hook"])
exit(0)
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