Re: bind to IPv6 only?

I do more trace this issue.

When server.socket_host is "::" on Win 8.1, my server listen from IPv4, IPv6
My server can be connected from IPv4, IPv6.
Protocol    Local Address               Remote Address          State
TCP         0.0.0.0:7070                0.0.0.0:0               LISTENING
TCPV6       [0:0:0:0:0:0:0:0]:7070      [0:0:0:0:0:0:0:0]:0     LISTENING

When server.socket_host is "0:0:0:0:0:0:0:0" on Win 8.1, my server listen 
from IPv6
But, IOError occurred after about 50 seconds.
My server can be connected from IPv6 only in about 50 seconds.
Protocol    Local Address               Remote Address          State
TCPV6       [0:0:0:0:0:0:0:0]:7070      [0:0:0:0:0:0:0:0]:0     LISTENING

When server.socket_host is "::" on CentOS 7, my server listen from IPv6 
only.
However my server can be connected from IPv4, IPv6.
[root@localhost cqprefserver]# netstat -apn | grep 7070
tcp6       0      0 :::7070                 :::*                    LISTEN 
     5695/python  

When server.socket_host is "0:0:0:0:0:0:0:0" on CentOS 7, my server listen 
from IPv6 only.
However my server can be connected from IPv4, IPv6 and IOError don't 
occurred.
[root@localhost cqprefserver]# netstat -apn | grep 7070
tcp6       0      0 :::7070                 :::*                    LISTEN 
     29574/python

To works well, check_port() in wait_for_occupied_port() must raise IOError.
To check, I write the small test script refer to check_port() function in 
\Lib\site-packages\cherrypy\process\servers.py
import socket

#host = "::"
host = "0:0:0:0:0:0:0:0"
#host = "0.0.0.0"
port = 7070
timeout = 1.0

info = socket.getaddrinfo(host, port, socket.AF_UNSPEC,
                          socket.SOCK_STREAM)

print info

af, socktype, proto, canonname, sa = info[0]

s = socket.socket(af, socktype, proto)
s.settimeout(timeout)
s.connect((host, port))
s.close()

Above script works well on CentOS 7, python 2.7.5.
But error occurred on Win 8.1, python 2.7.11.
D:\test>testport.py
[(23, 1, 0, '', ('::', 7070, 0, 0))]
Traceback (most recent call last):
  File "D:\test\testport.py", line 18, in <module>
    s.connect((host, port))
  File "C:\devtool\py27x86\lib\socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 10049]

IOError occurred by this error on Win 8.1
I modify the client_host() function in 
\Lib\site-packages\cherrypy\process\servers.py
def client_host(server_host):
    """Return the host on which a client can connect to the given 
listener."""
    if server_host == '0.0.0.0':
        # 0.0.0.0 is INADDR_ANY, which should answer on localhost.
        return '127.0.0.1'
    if server_host in ('::', '::0', '::0.0.0.0', '0:0:0:0:0:0:0:0'): # add 
'0:0:0:0:0:0:0:0'
        # :: is IN6ADDR_ANY, which should answer on localhost.
        # ::0 and ::0.0.0.0 are non-canonical but common
        # ways to write IN6ADDR_ANY.
        return '::1'
    return server_host

My server works well on Win 8.1
[29/Mar/2016:15:11:03] ENGINE Bus STARTING
[29/Mar/2016:15:11:03] ENGINE Started monitor thread '_TimeoutMonitor'.
[29/Mar/2016:15:11:03] ENGINE Started monitor thread 'Autoreloader'.
[29/Mar/2016:15:11:03] ENGINE Serving on http://0:0:0:0:0:0:0:0:7070
[29/Mar/2016:15:11:03] ENGINE Bus STARTED

However, it seemed impossible to listen from IPv6 only on CentOS 7.

2016년 3월 23일 수요일 오후 5시 28분 27초 UTC+9, young-kyun Kim 님의 말:
>
> bind to IPv6 only
>
> Hi!
>
> I try to bind to IPv6 only.
> But my server failed with ChannelFailures error.
>
> ------------------------------------------
> Windows 8.1 Enterprise 64bit
> Python 2.7.11 32bit
> CherryPy 5.1.0
> ------------------------------------------
> server_config = {
>     "engine.autoreload.on": False,
>     "server.socket_host": "::",
>     "server.socket_port": 7070
> }
>
> cherrypy.config.update(server_config)
> ------------------------------------------
>
> My server works well with "0.0.0.0"(IPv4 Only) or "::"(IPv4 + IPv6).
>
> But My server don't work with "[::]", "0:0:0:0:0:0:0:0", 
> "[0:0:0:0:0:0:0:0]"(IPv6 Only?).
> 7070 port don't used by any other process. (checked by tcpview)
>
> Below is the error message of cherry.
> Before below error message is displayed, my server does response to my 
> request. 
>
> -------------------------------------------------------------------------------------------
> [23/Mar/2016:14:58:13] ENGINE Error in 'start' listener <bound method 
> Server.start of <cherrypy._cpserver.Server object at 0x02F2CA90>>
> Traceback (most recent call last):
>   File "C:\devtool\py27x86\lib\site-packages\cherrypy\process\wspbus.py", 
> line 203, in publish
>     output.append(listener(*args, **kwargs))
>   File "C:\devtool\py27x86\lib\site-packages\cherrypy\_cpserver.py", line 
> 168, in start
>     ServerAdapter.start(self)
>   File "C:\devtool\py27x86\lib\site-packages\cherrypy\process\servers.py", 
> line 177, in start
>     self.wait()
>   File "C:\devtool\py27x86\lib\site-packages\cherrypy\process\servers.py", 
> line 232, in wait
>     wait_for_occupied_port(host, port)
>   File "C:\devtool\py27x86\lib\site-packages\cherrypy\process\servers.py", 
> line 458, in wait_for_occupied_port
>     raise IOError("Port %r not bound on %r" % (port, host))
> IOError: Port 7070 not bound on '[::]'
>
> [23/Mar/2016:14:58:13] ENGINE Shutting down due to error in start listener:
> Traceback (most recent call last):
>   File "C:\devtool\py27x86\lib\site-packages\cherrypy\process\wspbus.py", 
> line 241, in start
>     self.publish('start')
>   File "C:\devtool\py27x86\lib\site-packages\cherrypy\process\wspbus.py", 
> line 221, in publish
>     raise exc
> ChannelFailures: IOError("Port 7070 not bound on '[::]'",)
>
> -------------------------------------------------------------------------------------------
>
> How can I bind to IPv6 only?
>

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