nip.io
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#!/usr/bin/python import ConfigParser import os import re import sys DEBUG = 0 def log(msg): sys.stderr.write('backend (%s): %s\n' % (os.getpid(), msg)) def write(*l): args = len(l) c = 0 for a in l: c += 1 if DEBUG: log('writing: %s' % a) sys.stdout.write(a) if c < args: if DEBUG: log('writetab') sys.stdout.write('\t') if DEBUG: log('writenewline') sys.stdout.write('\n') sys.stdout.flush() def get_next(): if DEBUG: log('reading now') l = sys.stdin.readline() if DEBUG: log('read line: %s' % l) return l.strip().split('\t') class DynamicBackend: def __init__(self): self.id = '' self.soa = '' self.domain = '' self.ip_address = '' self.ttl = '' self.name_servers = {} def configure(self): fname = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'backend.conf') if not os.path.exists(fname): log('%s does not exist' % fname) sys.exit(1) fp = open(fname) config = ConfigParser.ConfigParser() config.readfp(fp) fp.close() self.id = config.get('soa', 'id') self.soa = '%s %s %s' % (config.get('soa', 'ns'), config.get('soa', 'hostmaster'), self.id) self.domain = config.get('main', 'domain') self.ip_address = config.get('main', 'ipaddress') self.ttl = config.get('main', 'ttl') for entry in config.items('nameservers'): self.name_servers[entry[0]] = entry[1] log('Name servers: %s' % self.name_servers) log('ID: %s' % self.id) log('TTL %s' % self.ttl) log('SOA: %s' % self.soa) log('IP Address: %s' % self.ip_address) log('DOMAIN: %s' % self.domain) def run(self): log('starting up') handshake = get_next() if handshake[1] != '1': log('Not version 1: %s' % handshake) sys.exit(1) write('OK', 'We are good') log('Done handshake') while True: cmd = get_next() if DEBUG: log(cmd) if len(cmd) < 6: log('did not understand: %s' % cmd) write('FAIL') continue qname = cmd[1].lower() qtype = cmd[3] if (qtype == 'A' or qtype == 'ANY') and qname.endswith(self.domain): if qname == self.domain: self.handle_self(self.domain) elif qname in self.name_servers: self.handle_nameservers(qname) else: self.handle_subdomains(qname) elif qtype == 'SOA' and qname.endswith(self.domain): self.handle_soa(qname) else: self.handle_unknown(qtype, qname) def handle_self(self, name): write('DATA', name, 'IN', 'A', self.ttl, self.id, self.ip_address) self.write_name_servers(name) write('END') def handle_subdomains(self, qname): subdomain = qname[0:qname.find(self.domain) - 1] subparts = subdomain.split('.') if len(subparts) < 4: if DEBUG: log('subparts less than 4') self.handle_self(qname) return ipaddress = subparts[-4:] if DEBUG: log('ip: %s' % ipaddress) for part in ipaddress: if re.match('^\d{1,3}$', part) is None: if DEBUG: log('%s is not a number' % part) self.handle_self(qname) return parti = int(part) if parti < 0 or parti > 255: if DEBUG: log('%d is too big/small' % parti) self.handle_self(qname) return write('DATA', qname, 'IN', 'A', self.ttl, self.id, '%s.%s.%s.%s' % (ipaddress[0], ipaddress[1], ipaddress[2], ipaddress[3])) self.write_name_servers(qname) write('END') def handle_nameservers(self, qname): ip = self.name_servers[qname] write('DATA', qname, 'IN', 'A', self.ttl, self.id, ip) write('END') def write_name_servers(self, qname): for nameServer in self.name_servers: write('DATA', qname, 'IN', 'NS', self.ttl, self.id, nameServer) def handle_soa(self, qname): write('DATA', qname, 'IN', 'SOA', self.ttl, self.id, self.soa) write('END') def handle_unknown(self, qtype, qname): write('LOG', 'Unknown type: %s, domain: %s' % (qtype, qname)) write('END') if __name__ == '__main__': backend = DynamicBackend() backend.configure() backend.run() |
Commits for nip.iosrc/backend.py
Revision | Author | Commited | Message |
---|---|---|---|
e36e52 ... Diff | rs | Tue 22 Jan, 2019 07:29:22 +0000 | Formatting changes |
59b962 ... Diff | rs | Wed 18 Dec, 2013 20:56:13 +0000 | add pid to log |
7e7ae2 ... Diff | rs | Sat 30 Nov, 2013 12:02:58 +0000 | change qname to lowercase |
a59335 ... Diff | rs | Fri 06 Jul, 2012 11:12:34 +0000 | Minor bugfixes: |
58ac8f ... | rs | Fri 08 Jun, 2012 15:22:15 +0000 | a working backend |