Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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import socket
import knownnodes
import socks
import state
from bmconfigparser import BMConfigParser
from debug import logger
def dns():
"""
DNS bootstrap. This could be programmed to use the SOCKS proxy to do the
DNS lookup some day but for now we will just rely on the entries in
defaultKnownNodes.py. Hopefully either they are up to date or the user
has run Bitmessage recently without SOCKS turned on and received good
bootstrap nodes using that method.
"""
def try_add_known_node(stream, addr, port, method=''):
try:
socket.inet_aton(addr)
except (TypeError, socket.error):
return
logger.info(
'Adding %s to knownNodes based on %s DNS bootstrap method',
addr, method)
knownnodes.addKnownNode(stream, state.Peer(addr, port))
proxy_type = BMConfigParser().get('bitmessagesettings', 'socksproxytype')
if proxy_type == 'none':
for port in [8080, 8444]:
try:
for item in socket.getaddrinfo(
'bootstrap%s.bitmessage.org' % port, 80):
try_add_known_node(1, item[4][0], port)
except:
logger.error(
'bootstrap%s.bitmessage.org DNS bootstrapping failed.',
port, exc_info=True
)
elif proxy_type == 'SOCKS5':
knownnodes.createDefaultKnownNodes(onion=True)
logger.debug('Adding default onion knownNodes.')
for port in [8080, 8444]:
logger.debug("Resolving %i through SOCKS...", port)
address_family = socket.AF_INET
sock = socks.socksocket(address_family, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.settimeout(20)
proxytype = socks.PROXY_TYPE_SOCKS5
sockshostname = BMConfigParser().get(
'bitmessagesettings', 'sockshostname')
socksport = BMConfigParser().getint(
'bitmessagesettings', 'socksport')
# Do domain name lookups through the proxy;
# though this setting doesn't really matter since we won't
# be doing any domain name lookups anyway.
rdns = True
if BMConfigParser().getboolean(
'bitmessagesettings', 'socksauthentication'):
socksusername = BMConfigParser().get(
'bitmessagesettings', 'socksusername')
sockspassword = BMConfigParser().get(
'bitmessagesettings', 'sockspassword')
sock.setproxy(
proxytype, sockshostname, socksport, rdns,
socksusername, sockspassword)
else:
sock.setproxy(
proxytype, sockshostname, socksport, rdns)
try:
ip = sock.resolve("bootstrap" + str(port) + ".bitmessage.org")
sock.shutdown(socket.SHUT_RDWR)
sock.close()
except:
logger.error("SOCKS DNS resolving failed", exc_info=True)
else:
try_add_known_node(1, ip, port, 'SOCKS')
else:
logger.info(
'DNS bootstrap skipped because the proxy type does not support'
' DNS resolution.'
)