mirror of
https://github.com/LBRYFoundation/LBRY-Vault.git
synced 2025-08-23 17:47:31 +00:00
c64e0c0e64
Currently requests are sent from the requestor's thread. The lock is not properly held where necessary so this is not thread-safe. For example it can race with the thread stopping and closing the socket the requestor is trying to use to send with. Resolve such races by having send_request() simply queue the requests, which are asynchronously sent from the interface thread itself.
376 lines
13 KiB
Python
376 lines
13 KiB
Python
#!/usr/bin/env python
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#
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# Electrum - lightweight Bitcoin client
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# Copyright (C) 2011 thomasv@gitorious
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import re, errno, os
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import threading, traceback, sys, time, Queue
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import socket
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import ssl
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import x509
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import util
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import requests
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ca_path = requests.certs.where()
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from version import ELECTRUM_VERSION, PROTOCOL_VERSION
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from simple_config import SimpleConfig
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def Interface(server, response_queue, config = None):
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"""Interface factory function. The returned interface class handles the connection
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to a single remote electrum server. The object handles all necessary locking. It's
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exposed API is:
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- Inherits everything from threading.Thread.
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- Member functions send_request(), stop(), is_connected()
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- Member variable server.
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"is_connected()" is currently racy. "server" is constant for the object's lifetime and hence
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synchronization is unnecessary.
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"""
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host, port, protocol = server.split(':')
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if protocol in 'st':
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return TcpInterface(server, response_queue, config)
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else:
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raise Exception('Unknown protocol: %s'%protocol)
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class TcpInterface(threading.Thread):
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def __init__(self, server, response_queue, config = None):
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threading.Thread.__init__(self)
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self.daemon = True
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self.config = config if config is not None else SimpleConfig()
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self.lock = threading.Lock()
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self.connected = False
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self.debug = False # dump network messages. can be changed at runtime using the console
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self.message_id = 0
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self.response_queue = response_queue
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self.request_queue = Queue.Queue()
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self.unanswered_requests = {}
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# are we waiting for a pong?
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self.is_ping = False
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self.ping_time = 0
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# parse server
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self.server = server
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self.host, self.port, self.protocol = self.server.split(':')
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self.port = int(self.port)
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self.use_ssl = (self.protocol == 's')
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def print_error(self, *msg):
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util.print_error("[%s]"%self.host, *msg)
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def process_response(self, response):
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if self.debug:
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self.print_error("<--", response)
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msg_id = response.get('id')
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error = response.get('error')
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result = response.get('result')
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if msg_id is not None:
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with self.lock:
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method, params, _id, queue = self.unanswered_requests.pop(msg_id)
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if queue is None:
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queue = self.response_queue
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else:
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# notification
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method = response.get('method')
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params = response.get('params')
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_id = None
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queue = self.response_queue
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# restore parameters
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if method == 'blockchain.numblocks.subscribe':
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result = params[0]
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params = []
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elif method == 'blockchain.headers.subscribe':
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result = params[0]
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params = []
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elif method == 'blockchain.address.subscribe':
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addr = params[0]
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result = params[1]
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params = [addr]
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if method == 'server.version':
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self.server_version = result
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self.is_ping = False
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return
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if error:
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queue.put((self, {'method':method, 'params':params, 'error':error, 'id':_id}))
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else:
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queue.put((self, {'method':method, 'params':params, 'result':result, 'id':_id}))
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def check_host_name(self, peercert, name):
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"""Simple certificate/host name checker. Returns True if the
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certificate matches, False otherwise. Does not support
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wildcards."""
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# Check that the peer has supplied a certificate.
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# None/{} is not acceptable.
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if not peercert:
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return False
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if peercert.has_key("subjectAltName"):
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for typ, val in peercert["subjectAltName"]:
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if typ == "DNS" and val == name:
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return True
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else:
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# Only check the subject DN if there is no subject alternative
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# name.
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cn = None
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for attr, val in peercert["subject"]:
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# Use most-specific (last) commonName attribute.
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if attr == "commonName":
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cn = val
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if cn is not None:
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return cn == name
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return False
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def get_simple_socket(self):
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try:
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l = socket.getaddrinfo(self.host, self.port, socket.AF_UNSPEC, socket.SOCK_STREAM)
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except socket.gaierror:
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self.print_error("cannot resolve hostname")
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return
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for res in l:
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try:
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s = socket.socket(res[0], socket.SOCK_STREAM)
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s.connect(res[4])
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return s
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except BaseException as e:
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continue
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else:
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self.print_error("failed to connect", str(e))
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def get_socket(self):
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if self.use_ssl:
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cert_path = os.path.join( self.config.path, 'certs', self.host)
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if not os.path.exists(cert_path):
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is_new = True
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s = self.get_simple_socket()
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if s is None:
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return
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# try with CA first
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try:
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s = ssl.wrap_socket(s, ssl_version=ssl.PROTOCOL_SSLv23, cert_reqs=ssl.CERT_REQUIRED, ca_certs=ca_path, do_handshake_on_connect=True)
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except ssl.SSLError, e:
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s = None
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if s and self.check_host_name(s.getpeercert(), self.host):
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self.print_error("SSL certificate signed by CA")
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return s
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# get server certificate.
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# Do not use ssl.get_server_certificate because it does not work with proxy
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s = self.get_simple_socket()
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try:
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s = ssl.wrap_socket(s, ssl_version=ssl.PROTOCOL_SSLv23, cert_reqs=ssl.CERT_NONE, ca_certs=None)
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except ssl.SSLError, e:
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self.print_error("SSL error retrieving SSL certificate:", e)
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return
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dercert = s.getpeercert(True)
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s.close()
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cert = ssl.DER_cert_to_PEM_cert(dercert)
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# workaround android bug
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cert = re.sub("([^\n])-----END CERTIFICATE-----","\\1\n-----END CERTIFICATE-----",cert)
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temporary_path = cert_path + '.temp'
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with open(temporary_path,"w") as f:
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f.write(cert)
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else:
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is_new = False
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s = self.get_simple_socket()
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if s is None:
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return
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s.settimeout(2)
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s.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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if self.use_ssl:
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try:
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s = ssl.wrap_socket(s,
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ssl_version=ssl.PROTOCOL_SSLv23,
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cert_reqs=ssl.CERT_REQUIRED,
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ca_certs= (temporary_path if is_new else cert_path),
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do_handshake_on_connect=True)
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except ssl.SSLError, e:
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self.print_error("SSL error:", e)
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if e.errno != 1:
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return
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if is_new:
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rej = cert_path + '.rej'
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if os.path.exists(rej):
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os.unlink(rej)
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os.rename(temporary_path, rej)
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else:
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with open(cert_path) as f:
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cert = f.read()
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try:
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x = x509.X509()
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x.parse(cert)
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x.slow_parse()
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except:
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traceback.print_exc(file=sys.stderr)
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self.print_error("wrong certificate")
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return
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try:
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x.check_date()
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except:
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self.print_error("certificate has expired:", cert_path)
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os.unlink(cert_path)
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return
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self.print_error("wrong certificate")
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return
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except BaseException, e:
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self.print_error(e)
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if e.errno == 104:
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return
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traceback.print_exc(file=sys.stderr)
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return
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if is_new:
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self.print_error("saving certificate")
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os.rename(temporary_path, cert_path)
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return s
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def send_request(self, request, response_queue = None):
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'''Queue a request. Blocking only if called from other threads.'''
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self.request_queue.put((request, response_queue), threading.current_thread() != self)
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def send_requests(self):
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'''Sends all queued requests'''
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while self.is_connected() and not self.request_queue.empty():
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request, response_queue = self.request_queue.get()
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method = request.get('method')
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params = request.get('params')
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r = {'id': self.message_id, 'method': method, 'params': params}
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try:
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self.pipe.send(r)
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except socket.error, e:
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self.print_error("socket error:", e)
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self.connected = False
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return
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if self.debug:
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self.print_error("-->", r)
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self.unanswered_requests[self.message_id] = method, params, request.get('id'), response_queue
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self.message_id += 1
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def is_connected(self):
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return self.connected
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def stop(self):
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if self.connected and self.protocol in 'st' and self.s:
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self.s.shutdown(socket.SHUT_RDWR)
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self.s.close()
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self.connected = False
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self.print_error("stopped")
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def maybe_ping(self):
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# ping the server with server.version?
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if time.time() - self.ping_time > 60:
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if self.is_ping:
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self.print_error("ping timeout")
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self.stop()
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else:
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self.send_request({'method':'server.version', 'params':[ELECTRUM_VERSION, PROTOCOL_VERSION]})
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self.is_ping = True
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self.ping_time = time.time()
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def run(self):
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self.s = self.get_socket()
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if self.s:
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self.pipe = util.SocketPipe(self.s)
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self.s.settimeout(2)
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self.connected = True
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self.print_error("connected")
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self.change_status()
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if not self.connected:
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return
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# request timer
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request_time = False
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while self.connected:
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self.maybe_ping()
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self.send_requests()
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if not self.connected:
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break
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try:
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response = self.pipe.get()
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except util.timeout:
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if self.unanswered_requests:
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if request_time is False:
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request_time = time.time()
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self.print_error("setting timer")
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else:
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if time.time() - request_time > 10:
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self.print_error("request timeout", len(self.unanswered_requests))
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self.connected = False
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break
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continue
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if response is None:
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self.connected = False
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break
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if request_time is not False:
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self.print_error("stopping timer")
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request_time = False
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self.process_response(response)
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self.change_status()
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def change_status(self):
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self.response_queue.put((self, None))
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def check_cert(host, cert):
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try:
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x = x509.X509()
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x.parse(cert)
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x.slow_parse()
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except:
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traceback.print_exc(file=sys.stdout)
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return
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try:
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x.check_date()
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expired = False
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except:
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expired = True
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m = "host: %s\n"%host
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m += "has_expired: %s\n"% expired
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util.print_msg(m)
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def test_certificates():
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config = SimpleConfig()
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mydir = os.path.join(config.path, "certs")
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certs = os.listdir(mydir)
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for c in certs:
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print c
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p = os.path.join(mydir,c)
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with open(p) as f:
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cert = f.read()
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check_cert(c, cert)
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if __name__ == "__main__":
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test_certificates()
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