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node
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dns.js
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var
dns
=
process
.
binding
(
'cares'
)
;
var
net
=
process
.
binding
(
'net'
)
;
var
IOWatcher
=
process
.
binding
(
'io_watcher'
)
.
IOWatcher
;
var
watchers
=
{
}
;
var
activeWatchers
=
{
}
;
var
Timer
=
process
.
binding
(
'timer'
)
.
Timer
;
var
timer
=
new
Timer
(
)
;
timer
.
callback
=
function
(
)
{
var
sockets
=
Object
.
keys
(
activeWatchers
)
;
for
(
var
i
=
0
,
l
=
sockets
.
length
;
i
<
l
;
i
++
)
{
var
socket
=
sockets
[
i
]
;
var
s
=
parseInt
(
socket
,
10
)
;
channel
.
processFD
(
watchers
[
socket
]
.
read
?
s
:
dns
.
SOCKET_BAD
,
watchers
[
socket
]
.
write
?
s
:
dns
.
SOCKET_BAD
)
;
}
updateTimer
(
)
;
}
;
function
updateTimer
(
)
{
timer
.
stop
(
)
;
// Were just checking to see if activeWatchers is empty or not
if
(
0
===
Object
.
keys
(
activeWatchers
)
.
length
)
return
;
var
max
=
20000
;
var
timeout
=
channel
.
timeout
(
max
)
;
timer
.
start
(
timeout
,
0
)
;
}
var
channel
=
new
dns
.
Channel
(
{
SOCK_STATE_CB
:
function
(
socket
,
read
,
write
)
{
var
watcher
;
if
(
socket
in
watchers
)
{
watcher
=
watchers
[
socket
]
.
watcher
;
}
else
{
watcher
=
new
IOWatcher
(
)
;
watchers
[
socket
]
=
{
read
:
read
,
write
:
write
,
watcher
:
watcher
}
;
watcher
.
callback
=
function
(
read
,
write
)
{
channel
.
processFD
(
read
?
socket
:
dns
.
SOCKET_BAD
,
write
?
socket
:
dns
.
SOCKET_BAD
)
;
updateTimer
(
)
;
}
;
}
watcher
.
stop
(
)
;
if
(
!
(
read
||
write
)
)
{
delete
activeWatchers
[
socket
]
;
return
;
}
else
{
watcher
.
set
(
socket
,
read
==
1
,
write
==
1
)
;
watcher
.
start
(
)
;
activeWatchers
[
socket
]
=
watcher
;
}
updateTimer
(
)
;
}
}
)
;
exports
.
resolve
=
function
(
domain
,
type_
,
callback_
)
{
var
type
,
callback
;
if
(
typeof
(
type_
)
==
'string'
)
{
type
=
type_
;
callback
=
callback_
;
}
else
{
type
=
'A'
;
callback
=
arguments
[
1
]
;
}
var
resolveFunc
=
resolveMap
[
type
]
;
if
(
typeof
(
resolveFunc
)
==
'function'
)
{
resolveFunc
(
domain
,
callback
)
;
}
else
{
throw
new
Error
(
'Unknown type "'
+
type
+
'"'
)
;
}
}
;
function
familyToSym
(
family
)
{
if
(
family
!==
dns
.
AF_INET
&&
family
!==
dns
.
AF_INET6
)
{
family
=
(
family
===
6
)
?
dns
.
AF_INET6
:
dns
.
AF_INET
;
}
return
family
;
}
exports
.
getHostByName
=
function
(
domain
,
family
/*=4*/
,
callback
)
{
if
(
typeof
family
===
'function'
)
{
callback
=
family
;
family
=
null
;
}
channel
.
getHostByName
(
domain
,
familyToSym
(
family
)
,
callback
)
;
}
;
exports
.
getHostByAddr
=
function
(
address
,
family
/*=4*/
,
callback
)
{
if
(
typeof
family
===
'function'
)
{
callback
=
family
;
family
=
null
;
}
channel
.
getHostByAddr
(
address
,
familyToSym
(
family
)
,
callback
)
;
}
;
// Easy DNS A/AAAA look up
// lookup(domain, [family,] callback)
exports
.
lookup
=
function
(
domain
,
family
,
callback
)
{
// parse arguments
if
(
arguments
.
length
===
2
)
{
callback
=
family
;
family
=
undefined
;
}
else
if
(
family
&&
family
!==
4
&&
family
!==
6
)
{
family
=
parseInt
(
family
,
10
)
;
if
(
family
===
dns
.
AF_INET
)
{
family
=
4
;
}
else
if
(
family
===
dns
.
AF_INET6
)
{
family
=
6
;
}
else
if
(
family
!==
4
&&
family
!==
6
)
{
throw
new
Error
(
'invalid argument: "family" must be 4 or 6'
)
;
}
}
if
(
!
domain
)
{
callback
(
null
,
null
,
family
===
6
?
6
:
4
)
;
return
;
}
var
matchedFamily
=
net
.
isIP
(
domain
)
;
if
(
matchedFamily
)
{
callback
(
null
,
domain
,
matchedFamily
)
;
return
;
}
if
(
/
\w
\.
l
o
c
a
l
\.
?
$
/
.
test
(
domain
)
)
{
// ANNOYING: In the case of mDNS domains use NSS in the thread pool.
// I wish c-ares had better support.
process
.
binding
(
'net'
)
.
getaddrinfo
(
domain
,
4
,
function
(
err
,
domains4
)
{
callback
(
err
,
domains4
[
0
]
,
4
)
;
}
)
;
return
;
}
if
(
family
)
{
// resolve names for explicit address family
var
af
=
familyToSym
(
family
)
;
channel
.
getHostByName
(
domain
,
af
,
function
(
err
,
domains
)
{
if
(
!
err
&&
domains
&&
domains
.
length
)
{
if
(
family
!==
net
.
isIP
(
domains
[
0
]
)
)
{
callback
(
new
Error
(
'not found'
)
,
[
]
)
;
}
else
{
callback
(
null
,
domains
[
0
]
,
family
)
;
}
}
else
{
callback
(
err
,
[
]
)
;
}
}
)
;
return
;
}
// first resolve names for v4 and if that fails, try v6
channel
.
getHostByName
(
domain
,
dns
.
AF_INET
,
function
(
err
,
domains4
)
{
if
(
domains4
&&
domains4
.
length
)
{
callback
(
null
,
domains4
[
0
]
,
4
)
;
}
else
{
channel
.
getHostByName
(
domain
,
dns
.
AF_INET6
,
function
(
err
,
domains6
)
{
if
(
domains6
&&
domains6
.
length
)
{
callback
(
null
,
domains6
[
0
]
,
6
)
;
}
else
{
callback
(
err
,
[
]
)
;
}
}
)
;
}
}
)
;
}
;
exports
.
resolve4
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
A
,
callback
)
;
}
;
exports
.
resolve6
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
AAAA
,
callback
)
;
}
;
exports
.
resolveMx
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
MX
,
callback
)
;
}
;
exports
.
resolveTxt
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
TXT
,
callback
)
;
}
;
exports
.
resolveSrv
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
SRV
,
callback
)
;
}
;
exports
.
reverse
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
PTR
,
callback
)
;
}
;
exports
.
resolveNs
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
NS
,
callback
)
;
}
;
exports
.
resolveCname
=
function
(
domain
,
callback
)
{
channel
.
query
(
domain
,
dns
.
CNAME
,
callback
)
;
}
;
var
resolveMap
=
{
A
:
exports
.
resolve4
,
AAAA
:
exports
.
resolve6
,
MX
:
exports
.
resolveMx
,
TXT
:
exports
.
resolveTxt
,
SRV
:
exports
.
resolveSrv
,
PTR
:
exports
.
resolvePtr
,
NS
:
exports
.
resolveNs
,
CNAME
:
exports
.
resolveCname
}
;
// ERROR CODES
exports
.
NODATA
=
dns
.
NODATA
;
exports
.
FORMERR
=
dns
.
FORMERR
;
exports
.
BADRESP
=
dns
.
BADRESP
;
exports
.
NOTFOUND
=
dns
.
NOTFOUND
;
exports
.
BADNAME
=
dns
.
BADNAME
;
exports
.
TIMEOUT
=
dns
.
TIMEOUT
;
exports
.
CONNREFUSED
=
dns
.
CONNREFUSED
;
exports
.
NOMEM
=
dns
.
NOMEM
;
exports
.
DESTRUCTION
=
dns
.
DESTRUCTION
;
exports
.
NOTIMP
=
dns
.
NOTIMP
;
exports
.
EREFUSED
=
dns
.
EREFUSED
;
exports
.
SERVFAIL
=
dns
.
SERVFAIL
;
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