#!/usr/bin/env python3
# Copyright (c) 2015-2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test bitcoind with different proxy configuration.

Test plan:
- Start bitcoind's with different proxy configurations
- Use addnode to initiate connections
- Verify that proxies are connected to, and the right connection command is given
- Proxy configurations to test on bitcoind side:
    - `-proxy` (proxy everything)
    - `-onion` (proxy just onions)
    - `-proxyrandomize` Circuit randomization
- Proxy configurations to test on proxy side,
    - support no authentication (other proxy)
    - support no authentication + user/pass authentication (Tor)
    - proxy on IPv6

- Create various proxies (as threads)
- Create bitcoinds that connect to them
- Manipulate the bitcoinds using addnode (onetry) an observe effects

addnode connect to IPv4
addnode connect to IPv6
addnode connect to onion
addnode connect to generic DNS name
"""

import os
import socket

from test_framework.netutil import test_ipv6_local
from test_framework.socks5 import (
    AddressType,
    Socks5Command,
    Socks5Configuration,
    Socks5Server,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    PORT_MIN,
    PORT_RANGE,
)

RANGE_BEGIN = PORT_MIN + 2 * PORT_RANGE  # Start after p2p and rpc ports


class ProxyTest(BitcoinTestFramework):
    def set_test_params(self):
        self.num_nodes = 4

    def setup_nodes(self):
        self.have_ipv6 = test_ipv6_local()
        # Create two proxies on different ports
        # ... one unauthenticated
        self.conf1 = Socks5Configuration()
        self.conf1.addr = ('127.0.0.1', RANGE_BEGIN + (os.getpid() % 1000))
        self.conf1.unauth = True
        self.conf1.auth = False
        # ... one supporting authenticated and unauthenticated (Tor)
        self.conf2 = Socks5Configuration()
        self.conf2.addr = (
            '127.0.0.1', RANGE_BEGIN + 1000 + (os.getpid() % 1000))
        self.conf2.unauth = True
        self.conf2.auth = True
        if self.have_ipv6:
            # ... one on IPv6 with similar configuration
            self.conf3 = Socks5Configuration()
            self.conf3.af = socket.AF_INET6
            self.conf3.addr = (
                '::1', RANGE_BEGIN + 2000 + (os.getpid() % 1000))
            self.conf3.unauth = True
            self.conf3.auth = True
        else:
            self.log.warning("Testing without local IPv6 support")

        self.serv1 = Socks5Server(self.conf1)
        self.serv1.start()
        self.serv2 = Socks5Server(self.conf2)
        self.serv2.start()
        if self.have_ipv6:
            self.serv3 = Socks5Server(self.conf3)
            self.serv3.start()

        # Note: proxies are not used to connect to local nodes
        # this is because the proxy to use is based on CService.GetNetwork(),
        # which return NET_UNROUTABLE for localhost
        args = [
            ['-listen', '-proxy={}:{}'.format(
                self.conf1.addr[0], self.conf1.addr[1]), '-proxyrandomize=1'],
            ['-listen', '-proxy={}:{}'.format(
                self.conf1.addr[0], self.conf1.addr[1]),
             '-onion={}:{}'.format(
                 self.conf2.addr[0], self.conf2.addr[1]), '-proxyrandomize=0'],
            ['-listen', '-proxy={}:{}'.format(
                self.conf2.addr[0], self.conf2.addr[1]), '-proxyrandomize=1'],
            []
        ]
        if self.have_ipv6:
            args[3] = ['-listen', '-proxy=[{}]:{}'.format(
                self.conf3.addr[0], self.conf3.addr[1]), '-proxyrandomize=0',
                '-noonion']
        self.add_nodes(self.num_nodes, extra_args=args)
        self.start_nodes()

    def node_test(self, node, proxies, auth, test_onion=True):
        rv = []
        # Test: outgoing IPv4 connection through node
        node.addnode("15.61.23.23:1234", "onetry")
        cmd = proxies[0].queue.get()
        assert isinstance(cmd, Socks5Command)
        # Note: bitcoind's SOCKS5 implementation only sends atyp DOMAINNAME,
        # even if connecting directly to IPv4/IPv6
        assert_equal(cmd.atyp, AddressType.DOMAINNAME)
        assert_equal(cmd.addr, b"15.61.23.23")
        assert_equal(cmd.port, 1234)
        if not auth:
            assert_equal(cmd.username, None)
            assert_equal(cmd.password, None)
        rv.append(cmd)

        if self.have_ipv6:
            # Test: outgoing IPv6 connection through node
            node.addnode(
                "[1233:3432:2434:2343:3234:2345:6546:4534]:5443", "onetry")
            cmd = proxies[1].queue.get()
            assert isinstance(cmd, Socks5Command)
            # Note: bitcoind's SOCKS5 implementation only sends atyp
            # DOMAINNAME, even if connecting directly to IPv4/IPv6
            assert_equal(cmd.atyp, AddressType.DOMAINNAME)
            assert_equal(cmd.addr, b"1233:3432:2434:2343:3234:2345:6546:4534")
            assert_equal(cmd.port, 5443)
            if not auth:
                assert_equal(cmd.username, None)
                assert_equal(cmd.password, None)
            rv.append(cmd)

        if test_onion:
            # Test: outgoing onion connection through node
            node.addnode("bitcoinostk4e4re.onion:8333", "onetry")
            cmd = proxies[2].queue.get()
            assert isinstance(cmd, Socks5Command)
            assert_equal(cmd.atyp, AddressType.DOMAINNAME)
            assert_equal(cmd.addr, b"bitcoinostk4e4re.onion")
            assert_equal(cmd.port, 8333)
            if not auth:
                assert_equal(cmd.username, None)
                assert_equal(cmd.password, None)
            rv.append(cmd)

        # Test: outgoing DNS name connection through node
        node.addnode("node.noumenon:8333", "onetry")
        cmd = proxies[3].queue.get()
        assert isinstance(cmd, Socks5Command)
        assert_equal(cmd.atyp, AddressType.DOMAINNAME)
        assert_equal(cmd.addr, b"node.noumenon")
        assert_equal(cmd.port, 8333)
        if not auth:
            assert_equal(cmd.username, None)
            assert_equal(cmd.password, None)
        rv.append(cmd)

        return rv

    def run_test(self):
        # basic -proxy
        self.node_test(
            self.nodes[0], [self.serv1, self.serv1, self.serv1, self.serv1], False)

        # -proxy plus -onion
        self.node_test(
            self.nodes[1], [self.serv1, self.serv1, self.serv2, self.serv1], False)

        # -proxy plus -onion, -proxyrandomize
        rv = self.node_test(
            self.nodes[2], [self.serv2, self.serv2, self.serv2, self.serv2], True)
        # Check that credentials as used for -proxyrandomize connections are
        # unique
        credentials = set((x.username, x.password) for x in rv)
        assert_equal(len(credentials), len(rv))

        if self.have_ipv6:
            # proxy on IPv6 localhost
            self.node_test(
                self.nodes[3], [self.serv3, self.serv3, self.serv3, self.serv3], False, False)

        def networks_dict(d):
            r = {}
            for x in d['networks']:
                r[x['name']] = x
            return r

        # test RPC getnetworkinfo
        n0 = networks_dict(self.nodes[0].getnetworkinfo())
        for net in ['ipv4', 'ipv6', 'onion']:
            assert_equal(n0[net]['proxy'], '{}:{}'.format(
                self.conf1.addr[0], self.conf1.addr[1]))
            assert_equal(n0[net]['proxy_randomize_credentials'], True)
        assert_equal(n0['onion']['reachable'], True)

        n1 = networks_dict(self.nodes[1].getnetworkinfo())
        for net in ['ipv4', 'ipv6']:
            assert_equal(n1[net]['proxy'], '{}:{}'.format(
                self.conf1.addr[0], self.conf1.addr[1]))
            assert_equal(n1[net]['proxy_randomize_credentials'], False)
        assert_equal(n1['onion']['proxy'], '{}:{}'.format(
            self.conf2.addr[0], self.conf2.addr[1]))
        assert_equal(n1['onion']['proxy_randomize_credentials'], False)
        assert_equal(n1['onion']['reachable'], True)

        n2 = networks_dict(self.nodes[2].getnetworkinfo())
        for net in ['ipv4', 'ipv6', 'onion']:
            assert_equal(n2[net]['proxy'], '{}:{}'.format(
                self.conf2.addr[0], self.conf2.addr[1]))
            assert_equal(n2[net]['proxy_randomize_credentials'], True)
        assert_equal(n2['onion']['reachable'], True)

        if self.have_ipv6:
            n3 = networks_dict(self.nodes[3].getnetworkinfo())
            for net in ['ipv4', 'ipv6']:
                assert_equal(n3[net]['proxy'], '[{}]:{}'.format(
                    self.conf3.addr[0], self.conf3.addr[1]))
                assert_equal(n3[net]['proxy_randomize_credentials'], False)
            assert_equal(n3['onion']['reachable'], False)


if __name__ == '__main__':
    ProxyTest().main()
