#!/usr/bin/env python3
# Copyright (c) 2014-2019 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 running bitcoind with the -rpcbind and -rpcallowip options."""

from platform import uname
import sys

from test_framework.netutil import addr_to_hex, all_interfaces, get_bind_addrs, test_ipv6_local
from test_framework.test_framework import BitcoinTestFramework, SkipTest
from test_framework.util import (
    assert_equal,
    assert_raises_rpc_error,
    get_rpc_proxy,
    rpc_port,
    rpc_url,
)


class RPCBindTest(BitcoinTestFramework):
    def set_test_params(self):
        self.setup_clean_chain = True
        self.bind_to_localhost_only = False
        self.num_nodes = 1

    def setup_network(self):
        self.add_nodes(self.num_nodes, None)

    def add_options(self, parser):
        parser.add_argument("--ipv4", action='store_true', dest="run_ipv4", help="Run ipv4 tests only", default=False)
        parser.add_argument("--ipv6", action='store_true', dest="run_ipv6", help="Run ipv6 tests only", default=False)
        parser.add_argument(
            "--nonloopback",
            action='store_true',
            dest="run_nonloopback",
            help="Run non-loopback tests only",
            default=False)

    def run_bind_test(self, allow_ips, connect_to, addresses, expected):
        '''
        Start a node with requested rpcallowip and rpcbind parameters,
        then try to connect, and check if the set of bound addresses
        matches the expected set.
        '''
        self.log.info("Bind test for {}".format(str(addresses)))
        expected = [(addr_to_hex(addr), port) for (addr, port) in expected]
        base_args = ['-disablewallet', '-nolisten']
        if allow_ips:
            base_args += ['-rpcallowip=' + x for x in allow_ips]
        binds = ['-rpcbind=' + addr for addr in addresses]
        parts = connect_to.split(':')
        if len(parts) == 2:
            self.nodes[0].host = parts[0]
            self.nodes[0].rpc_port = parts[1]
        else:
            self.nodes[0].host = connect_to
            self.nodes[0].rpc_port = rpc_port(self.nodes[0].index)
        self.start_node(0, base_args + binds)
        pid = self.nodes[0].process.pid
        assert_equal(set(get_bind_addrs(pid)), set(expected))
        self.stop_nodes()

    def run_allowip_test(self, allow_ips, rpchost, rpcport):
        '''
        Start a node with rpcallow IP, and request getnetworkinfo
        at a non-localhost IP.
        '''
        node_args = \
            ['-disablewallet', '-nolisten'] + \
            ['-rpcallowip='+x for x in allow_ips] + \
            ['-rpcbind='+addr for addr in ['127.0.0.1', "{}:{}".format(
                rpchost, rpcport)]]  # Bind to localhost as well so start_nodes doesn't hang
        self.nodes[0].host = None
        self.start_nodes([node_args])
        # connect to node through non-loopback interface
        url = rpc_url(self.nodes[0].datadir, self.chain, rpchost, rpcport)
        node = get_rpc_proxy(url, 0, coveragedir=self.options.coveragedir)
        node.getnetworkinfo()
        self.stop_nodes()

    def run_test(self):
        # due to OS-specific network stats queries, this test works only on
        # Linux
        if sum([self.options.run_ipv4, self.options.run_ipv6, self.options.run_nonloopback]) > 1:
            raise AssertionError("Only one of --ipv4, --ipv6 and --nonloopback can be set")

        self.log.info("Check for linux")
        if not sys.platform.startswith('linux'):
            raise SkipTest("This test can only be run on Linux.")

        # WSL in currently not supported (refer to
        # https://reviews.bitcoinabc.org/T400 for details).
        # This condition should be removed once netstat support is provided by
        # Microsoft.
        if "microsoft" in uname().version.lower():
            raise SkipTest(
                "Running this test on WSL is currently not supported")

        self.log.info("Check for ipv6")
        have_ipv6 = test_ipv6_local()
        if not have_ipv6 and not self.options.run_ipv4:
            raise SkipTest("This test requires ipv6 support.")

        self.log.info("Check for non-loopback interface")
        self.non_loopback_ip = None
        for name,ip in all_interfaces():
            if ip != '127.0.0.1':
                self.non_loopback_ip = ip
                break
        if self.non_loopback_ip is None and self.options.run_nonloopback:
            raise SkipTest("This test requires a non-loopback ip address.")

        self.defaultport = rpc_port(0)

        if not self.options.run_nonloopback:
            self._run_loopback_tests()
        if not self.options.run_ipv4 and not self.options.run_ipv6:
            self._run_nonloopback_tests()

    def _run_loopback_tests(self):
        if self.options.run_ipv4:
            # check only IPv4 localhost (explicit)
            self.run_bind_test(['127.0.0.1'], '127.0.0.1', ['127.0.0.1'],
                               [('127.0.0.1', self.defaultport)])
            # check only IPv4 localhost (explicit) with alternative port
            self.run_bind_test(['127.0.0.1'], '127.0.0.1:32171', ['127.0.0.1:32171'],
                               [('127.0.0.1', 32171)])
            # check only IPv4 localhost (explicit) with multiple alternative ports on same host
            self.run_bind_test(['127.0.0.1'], '127.0.0.1:32171', ['127.0.0.1:32171', '127.0.0.1:32172'],
                               [('127.0.0.1', 32171), ('127.0.0.1', 32172)])
        else:
            # check default without rpcallowip (IPv4 and IPv6 localhost)
            self.run_bind_test(None, '127.0.0.1', [],
                               [('127.0.0.1', self.defaultport), ('::1', self.defaultport)])
            # check default with rpcallowip (IPv4 and IPv6 localhost)
            self.run_bind_test(['127.0.0.1'], '127.0.0.1', [],
                               [('127.0.0.1', self.defaultport), ('::1', self.defaultport)])
            # check only IPv6 localhost (explicit)
            self.run_bind_test(['[::1]'], '[::1]', ['[::1]'],
                               [('::1', self.defaultport)])
            # check both IPv4 and IPv6 localhost (explicit)
            self.run_bind_test(['127.0.0.1'], '127.0.0.1', ['127.0.0.1', '[::1]'],
                               [('127.0.0.1', self.defaultport), ('::1', self.defaultport)])

    def _run_nonloopback_tests(self):
        self.log.info("Using interface {} for testing".format(self.non_loopback_ip))

        # check only non-loopback interface
        self.run_bind_test([self.non_loopback_ip], self.non_loopback_ip, [self.non_loopback_ip],
                           [(self.non_loopback_ip, self.defaultport)])

        # Check that with invalid rpcallowip, we are denied
        self.run_allowip_test([self.non_loopback_ip], self.non_loopback_ip, self.defaultport)
        assert_raises_rpc_error(-342, "non-JSON HTTP response with '403 Forbidden' from server",
                                self.run_allowip_test, ['1.1.1.1'], self.non_loopback_ip, self.defaultport)

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