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Recolic
ip2domain-dnsserver
Commits
1592f0c2
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Commit
1592f0c2
authored
4 years ago
by
Bensong Liu
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1592f0c2
#!/usr/bin/env python3.6
import
json
import
logging
import
os
import
signal
from
datetime
import
datetime
from
pathlib
import
Path
from
textwrap
import
wrap
from
time
import
sleep
import
dnslib
from
dnslib
import
DNSLabel
,
QTYPE
,
RR
,
dns
from
dnslib.proxy
import
ProxyResolver
from
dnslib.server
import
DNSServer
SERIAL_NO
=
int
((
datetime
.
utcnow
()
-
datetime
(
1970
,
1
,
1
)).
total_seconds
())
handler
=
logging
.
StreamHandler
()
handler
.
setLevel
(
logging
.
INFO
)
handler
.
setFormatter
(
logging
.
Formatter
(
'
%(asctime)s: %(message)s
'
,
datefmt
=
'
%H:%M:%S
'
))
logger
=
logging
.
getLogger
(
__name__
)
logger
.
addHandler
(
handler
)
logger
.
setLevel
(
logging
.
INFO
)
TYPE_LOOKUP
=
{
'
A
'
:
(
dns
.
A
,
QTYPE
.
A
),
'
AAAA
'
:
(
dns
.
AAAA
,
QTYPE
.
AAAA
),
'
CAA
'
:
(
dns
.
CAA
,
QTYPE
.
CAA
),
'
CNAME
'
:
(
dns
.
CNAME
,
QTYPE
.
CNAME
),
'
DNSKEY
'
:
(
dns
.
DNSKEY
,
QTYPE
.
DNSKEY
),
'
MX
'
:
(
dns
.
MX
,
QTYPE
.
MX
),
'
NAPTR
'
:
(
dns
.
NAPTR
,
QTYPE
.
NAPTR
),
'
NS
'
:
(
dns
.
NS
,
QTYPE
.
NS
),
'
PTR
'
:
(
dns
.
PTR
,
QTYPE
.
PTR
),
'
RRSIG
'
:
(
dns
.
RRSIG
,
QTYPE
.
RRSIG
),
'
SOA
'
:
(
dns
.
SOA
,
QTYPE
.
SOA
),
'
SRV
'
:
(
dns
.
SRV
,
QTYPE
.
SRV
),
'
TXT
'
:
(
dns
.
TXT
,
QTYPE
.
TXT
),
'
SPF
'
:
(
dns
.
TXT
,
QTYPE
.
TXT
),
}
import
re
serving_domains
=
[
'
example.com.
'
,
'
ip4.recolic.net.
'
,
'
ip4.recolic.cc.
'
]
ns_ipaddr
=
'
127.0.0.1
'
def
gen_response
(
qt
,
qn
):
global
serving_domains
prefix_
=
list
(
filter
(
lambda
d
:
qn
==
d
or
qn
.
endswith
(
'
.
'
+
d
),
serving_domains
))
if
len
(
prefix_
)
!=
1
:
print
(
"
Error: invalid request domain {} in {}
"
.
format
(
qn
,
serving_domains
))
return
None
prefix
=
prefix_
[
0
]
if
qt
==
'
SOA
'
:
generated_soa
=
dnslib
.
SOA
(
mname
=
"
todo.
"
+
domain_text
,
rname
=
"
root@recolic.net
"
,
times
=
(
201307231
,
# serial number
10000
,
# refresh
2400
,
# retry
604800
,
# expire
3600
,
# minimum
))
return
RR
(
rname
=
prefix
,
rtype
=
QTYPE
.
SOA
,
rclass
=
1
,
ttl
=
86400
,
rdata
=
generated_soa
)
# return {"mname": "todo."+domain_text, "rname": "root@recolic.net", "serial": "10", "refresh": 3600, "retry": 600, "expire": 604800, "minimum": 86400}
elif
qt
==
'
A
'
:
requested_ip
=
qn
[:
len
(
qn
)
-
len
(
prefix
)].
strip
(
'
.
'
)
if
not
re
.
match
(
r
'
^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$
'
,
requested_ip
):
print
(
"
Invalid requested_ip:
"
+
requested_ip
)
return
None
generated_a
=
dnslib
.
A
(
requested_ip
)
return
RR
(
rname
=
qn
,
rtype
=
QTYPE
.
A
,
rclass
=
1
,
ttl
=
86400
,
rdata
=
generated_a
)
elif
qt
==
'
NS
'
:
generated_ns
=
dnslib
.
NS
(
ns_ipaddr
)
return
RR
(
rname
=
prefix
,
rtype
=
QTYPE
.
NS
,
rclass
=
1
,
ttl
=
86400
,
rdata
=
generated_ns
)
else
:
print
(
"
Invalid qt=
"
+
qt
)
return
None
class
Record
:
def
__init__
(
self
,
rname
,
rtype
,
args
):
self
.
_rname
=
DNSLabel
(
rname
)
rd_cls
,
self
.
_rtype
=
TYPE_LOOKUP
[
rtype
]
if
self
.
_rtype
==
QTYPE
.
SOA
and
len
(
args
)
==
2
:
# add sensible times to SOA
args
+=
(
SERIAL_NO
,
3600
,
3600
*
3
,
3600
*
24
,
3600
),
if
self
.
_rtype
==
QTYPE
.
TXT
and
len
(
args
)
==
1
and
isinstance
(
args
[
0
],
str
)
and
len
(
args
[
0
])
>
255
:
# wrap long TXT records as per dnslib's docs.
args
=
wrap
(
args
[
0
],
255
),
if
self
.
_rtype
in
(
QTYPE
.
NS
,
QTYPE
.
SOA
):
ttl
=
3600
*
24
else
:
ttl
=
300
self
.
rr
=
RR
(
rname
=
self
.
_rname
,
rtype
=
self
.
_rtype
,
rdata
=
rd_cls
(
*
args
),
ttl
=
ttl
,
)
def
match
(
self
,
q
):
return
q
.
qname
==
self
.
_rname
and
(
q
.
qtype
==
QTYPE
.
ANY
or
q
.
qtype
==
self
.
_rtype
)
def
sub_match
(
self
,
q
):
return
self
.
_rtype
==
QTYPE
.
SOA
and
q
.
qname
.
matchSuffix
(
self
.
_rname
)
def
__str__
(
self
):
return
str
(
self
.
rr
)
class
Resolver
(
ProxyResolver
):
def
__init__
(
self
,
upstream
):
super
().
__init__
(
upstream
,
53
,
5
)
def
resolve
(
self
,
request
,
handler
):
qt
=
QTYPE
[
request
.
q
.
qtype
]
qn
=
str
(
request
.
q
.
qname
)
print
(
qt
,
qn
)
reply
=
request
.
reply
()
resp
=
gen_response
(
qt
,
qn
)
if
resp
!=
None
:
if
qt
==
'
SOA
'
:
reply
.
add_auth
(
resp
)
elif
qt
==
'
NS
'
:
reply
.
add_ar
(
resp
)
else
:
reply
.
add_answer
(
resp
)
if
reply
.
rr
:
logger
.
info
(
'
found zone for %s[%s], %d replies
'
,
qn
,
qt
,
len
(
reply
.
rr
))
return
reply
logger
.
info
(
'
no local zone found, proxying %s[%s]
'
,
qn
,
qt
)
return
super
().
resolve
(
request
,
handler
)
def
handle_sig
(
signum
,
frame
):
logger
.
info
(
'
pid=%d, got signal: %s, stopping...
'
,
os
.
getpid
(),
signal
.
Signals
(
signum
).
name
)
exit
(
0
)
if
__name__
==
'
__main__
'
:
signal
.
signal
(
signal
.
SIGTERM
,
handle_sig
)
port
=
int
(
os
.
getenv
(
'
PORT
'
,
53
))
upstream
=
os
.
getenv
(
'
UPSTREAM
'
,
'
8.8.8.8
'
)
resolver
=
Resolver
(
upstream
)
udp_server
=
DNSServer
(
resolver
,
port
=
port
)
tcp_server
=
DNSServer
(
resolver
,
port
=
port
,
tcp
=
True
)
logger
.
info
(
'
starting DNS server on port %d, upstream DNS server
"
%s
"'
,
port
,
upstream
)
udp_server
.
start_thread
()
tcp_server
.
start_thread
()
try
:
while
udp_server
.
isAlive
():
sleep
(
1
)
except
KeyboardInterrupt
:
pass
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