On 11-11-01 12:26 PM, A Mennucc wrote:
[snip]
> I can also tell that the freevo-box is running Debian/squeeze/i386 ,
> and uses Python 2.6.6
Unfortunately there's really nothing in here that tells me what's going
wrong. Nothing looks out of the ordinary.
kaa.Socket uses AF_INET6 sockets exclusively, and uses IPv4-mapped IPv6
addresses for IPv4 addresses on AF_INET6 sockets. This is why you see:
$ netstat --inet6 -an | grep 19999
tcp6 0 0 127.0.0.1:19999 :::* LISTEN
That's expected; netstat is just showing the IPv4-mapped address
(::ffff:127.0.0.1) stripped of the prefix. These sockets can be
connected over IPv4.
Getting a /network/ unreachable when you try to connect to 127.0.0.1 is
perplexing. My first instinct was that lo was down, but your ip addr ls
output says otherwise.
Doing a bit of Googling, I see that the BSDs don't support IPv4-mapped
addresses on IPv6 sockets. This might be a reason to change kaa.Socket
to use AF_INET or AF_INET6 sockets selectively. Are you using a BSD
kernel on Debian? That could explain it, but I wouldn't have expected
the ip(8) calls to work in that case, or at least be so exactly
formatted. OTOH I don't know BSD at all. :)
Assuming you're not using BSD, I'd still like to understand what's
happening here. Can you please try the attached crudely constructed
test script and dump the output? Make sure ::1 isn't in the localhost
address list in /etc/hosts.
Thanks!
import socket
def to_v6(addr):
return '::ffff:' + addr if ':' not in addr and addr else addr
def v6sock(addr, port, bind=True, get=False):
print 'AF_INET6 %s to %s:%d' % ('bind' if bind else 'connect', addr, port)
addrs = socket.getaddrinfo(addr, port, socket.AF_INET6, socket.SOCK_STREAM, 0, socket.AI_V4MAPPED | socket.AI_ALL)
for addrinfo in (a[4] for a in addrs):
newinfo = (to_v6(addrinfo[0]),) + addrinfo[1:]
print ' try %s -> %s' % (addrinfo, newinfo)
try:
sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if bind:
sock.bind(newinfo)
else:
sock.connect(newinfo)
if get:
return sock
except socket.error, e:
print ' -> failed:', e
def v4sock(addr, port, bind=True, get=False):
print 'AF_INET %s to %s:%d' % ('bind' if bind else 'connect', addr, port)
addrs = socket.getaddrinfo(addr, port, socket.AF_INET, socket.SOCK_STREAM, 0, socket.AI_ALL)
for addrinfo in (a[4] for a in addrs):
print ' try %s' % repr(addrinfo)
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if bind:
sock.bind(addrinfo)
else:
sock.connect(addrinfo)
if get:
return sock
except socket.error, e:
print ' -> failed:', e
for host in ('localhost', '127.0.0.1'):
print '------', host
v4sock(host, 20011)
lsock = v4sock(host, 20011, get=True)
if lsock:
lsock.listen(10)
v4sock(host, 20011, False)
lsock.close()
else:
print ' skipping connect'
for host in ('localhost', 'ip6-localhost', '127.0.0.1', '::1'):
print '------', host
v6sock(host, 20011)
lsock = v6sock(host, 20011, get=True)
if lsock:
lsock.listen(10)
v6sock(host, 20011, False)
lsock.close()
else:
print ' skipping connect'
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