def bind_sockets(port, address=None, family=socket.AF_UNSPEC, backlog=128):
"""Creates listening sockets bound to the given port and address.
Returns a list of socket objects (multiple sockets are returned if
the given address maps to multiple IP addresses, which is most common
for mixed IPv4 and IPv6 use).
Address may be either an IP address or hostname. If it's a hostname,
the server will listen on all IP addresses associated with the
name. Address may be an empty string or None to listen on all
available interfaces. Family may be set to either socket.AF_INET
or socket.AF_INET6 to restrict to ipv4 or ipv6 addresses, otherwise
both will be used if available.
The ``backlog`` argument has the same meaning as for
``socket.listen()``.
"""
sockets = []
if address == "":
address = None
flags = socket.AI_PASSIVE
if hasattr(socket, "AI_ADDRCONFIG"):
# AI_ADDRCONFIG ensures that we only try to bind on ipv6
# if the system is configured for it, but the flag doesn't
# exist on some platforms (specifically WinXP, although
# newer versions of windows have it)
flags |= socket.AI_ADDRCONFIG
for res in socket.getaddrinfo(address, port, family, socket.SOCK_STREAM,
0, flags):
af, socktype, proto, canonname, sockaddr = res
sock = socket.socket(af, socktype, proto)
set_close_exec(sock.fileno())
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if af == socket.AF_INET6:
# On linux, ipv6 sockets accept ipv4 too by default,
# but this makes it impossible to bind to both
# 0.0.0.0 in ipv4 and :: in ipv6. On other systems,
# separate sockets *must* be used to listen for both ipv4
# and ipv6. For consistency, always disable ipv4 on our
# ipv6 sockets and use a separate ipv4 socket when needed.
#
# Python 2.x on windows doesn't have IPPROTO_IPV6.
if hasattr(socket, "IPPROTO_IPV6"):
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 1)
sock.setblocking(0)
sock.bind(sockaddr)
sock.listen(backlog)
sockets.append(sock)
return sockets
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