[tests] bind functional test nodes to 127.0.0.1

Prevents OSX firewall allow-this-application-to-accept-inbound-connections
permission popups and is generally safer.

To prevent binding to 127.0.0.1, set self.bind_to_localhost_only = False.

test/functional/rpc_bind.py

@@ -14,6 +14,7 @@ from test_framework.netutil import *
 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):

test/functional/test_framework/test_framework.py

@@ -63,6 +63,7 @@ class BitcoinTestFramework():
         self.nodes = []
         self.mocktime = 0
         self.supports_cli = False
+        self.bind_to_localhost_only = True
         self.set_test_params()
 
         assert hasattr(self, "num_nodes"), "Test must set self.num_nodes in set_test_params()"
@@ -215,15 +216,19 @@ class BitcoinTestFramework():
 
     def add_nodes(self, num_nodes, extra_args=None, rpchost=None, timewait=None, binary=None):
         """Instantiate TestNode objects"""
-
+        if self.bind_to_localhost_only:
+            extra_confs = [["bind=127.0.0.1"]] * num_nodes
+        else:
+            extra_confs = [[]] * num_nodes
         if extra_args is None:
             extra_args = [[]] * num_nodes
         if binary is None:
             binary = [None] * num_nodes
+        assert_equal(len(extra_confs), num_nodes)
         assert_equal(len(extra_args), num_nodes)
         assert_equal(len(binary), num_nodes)
         for i in range(num_nodes):
-            self.nodes.append(TestNode(i, self.options.tmpdir, extra_args[i], rpchost, timewait=timewait, binary=binary[i], stderr=None, mocktime=self.mocktime, coverage_dir=self.options.coveragedir, use_cli=self.options.usecli))
+            self.nodes.append(TestNode(i, self.options.tmpdir, rpchost=rpchost, timewait=timewait, binary=binary[i], stderr=None, mocktime=self.mocktime, coverage_dir=self.options.coveragedir, extra_conf=extra_confs[i], extra_args=extra_args[i], use_cli=self.options.usecli))
 
     def start_node(self, i, *args, **kwargs):
         """Start a bitcoind"""
@@ -395,7 +400,7 @@ class BitcoinTestFramework():
                 args = [os.getenv("BITCOIND", "bitcoind"), "-datadir=" + datadir]
                 if i > 0:
                     args.append("-connect=127.0.0.1:" + str(p2p_port(0)))
-                self.nodes.append(TestNode(i, self.options.cachedir, extra_args=[], rpchost=None, timewait=None, binary=None, stderr=None, mocktime=self.mocktime, coverage_dir=None))
+                self.nodes.append(TestNode(i, self.options.cachedir, extra_conf=["bind=127.0.0.1"], extra_args=[],rpchost=None, timewait=None, binary=None, stderr=None, mocktime=self.mocktime, coverage_dir=None))
                 self.nodes[i].args = args
                 self.start_node(i)
 

test/functional/test_framework/test_node.py

@@ -16,6 +16,7 @@ import time
 
 from .authproxy import JSONRPCException
 from .util import (
+    append_config,
     assert_equal,
     get_rpc_proxy,
     rpc_url,
@@ -42,7 +43,7 @@ class TestNode():
     To make things easier for the test writer, any unrecognised messages will
     be dispatched to the RPC connection."""
 
-    def __init__(self, i, dirname, extra_args, rpchost, timewait, binary, stderr, mocktime, coverage_dir, use_cli=False):
+    def __init__(self, i, dirname, rpchost, timewait, binary, stderr, mocktime, coverage_dir, extra_conf=None, extra_args=None, use_cli=False):
         self.index = i
         self.datadir = os.path.join(dirname, "node" + str(i))
         self.rpchost = rpchost
@@ -57,6 +58,8 @@ class TestNode():
             self.binary = binary
         self.stderr = stderr
         self.coverage_dir = coverage_dir
+        if extra_conf != None:
+            append_config(dirname, i, extra_conf)
         # Most callers will just need to add extra args to the standard list below.
         # For those callers that need more flexibity, they can just set the args property directly.
         # Note that common args are set in the config file (see initialize_datadir)

test/functional/test_framework/util.py

@@ -300,6 +300,12 @@ def initialize_datadir(dirname, n):
 def get_datadir_path(dirname, n):
     return os.path.join(dirname, "node" + str(n))
 
+def append_config(dirname, n, options):
+    datadir = get_datadir_path(dirname, n)
+    with open(os.path.join(datadir, "bitcoin.conf"), 'a', encoding='utf8') as f:
+        for option in options:
+            f.write(option + "\n")
+
 def get_auth_cookie(datadir):
     user = None
     password = None

test/functional/wallet_dump.py

@@ -84,7 +84,7 @@ class WalletDumpTest(BitcoinTestFramework):
         # longer than the default 30 seconds due to an expensive
         # CWallet::TopUpKeyPool call, and the encryptwallet RPC made later in
         # the test often takes even longer.
-        self.add_nodes(self.num_nodes, self.extra_args, timewait=60)
+        self.add_nodes(self.num_nodes, extra_args=self.extra_args, timewait=60)
         self.start_nodes()
 
     def run_test (self):

test/functional/wallet_import_rescan.py

@@ -124,7 +124,7 @@ class ImportRescanTest(BitcoinTestFramework):
             if import_node.prune:
                 extra_args[i] += ["-prune=1"]
 
-        self.add_nodes(self.num_nodes, extra_args)
+        self.add_nodes(self.num_nodes, extra_args=extra_args)
         self.start_nodes()
         for i in range(1, self.num_nodes):
             connect_nodes(self.nodes[i], 0)