test: Disable automatic connections by default

This prevents the node from trying to connect to random IPs on the internet
while running the functional tests. Exceptions are added when required for
the test to pass.

4 files changed, 13 insertions, 6 deletions

diff --git a/test/functional/feature_anchors.py b/test/functional/feature_anchors.py
index 24bb02bc90..c39f6e6d4b 100755
--- a/test/functional/feature_anchors.py
+++ b/test/functional/feature_anchors.py
@@ -23,6 +23,7 @@ def check_node_connections(*, node, num_in, num_out):
 class AnchorsTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
+        self.disable_autoconnect = False
 
     def setup_network(self):
         self.setup_nodes()
diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index de9d0d2e80..5a23df8a13 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -17,6 +17,7 @@ class ConfArgsTest(BitcoinTestFramework):
         self.num_nodes = 1
         self.supports_cli = False
         self.wallet_names = []
+        self.disable_autoconnect = False
 
     def test_config_file_parser(self):
         self.stop_node(0)
diff --git a/test/functional/test_framework/test_framework.py b/test/functional/test_framework/test_framework.py
index 40360c54a0..6d8e6ef45c 100755
--- a/test/functional/test_framework/test_framework.py
+++ b/test/functional/test_framework/test_framework.py
@@ -112,6 +112,9 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         # By default the wallet is not required. Set to true by skip_if_no_wallet().
         # When False, we ignore wallet_names regardless of what it is.
         self.requires_wallet = False
+        # Disable ThreadOpenConnections by default, so that adding entries to
+        # addrman will not result in automatic connections to them.
+        self.disable_autoconnect = True
         self.set_test_params()
         assert self.wallet_names is None or len(self.wallet_names) <= self.num_nodes
         if self.options.timeout_factor == 0 :
@@ -711,7 +714,7 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         if not os.path.isdir(cache_node_dir):
             self.log.debug("Creating cache directory {}".format(cache_node_dir))
 
-            initialize_datadir(self.options.cachedir, CACHE_NODE_ID, self.chain)
+            initialize_datadir(self.options.cachedir, CACHE_NODE_ID, self.chain, self.disable_autoconnect)
             self.nodes.append(
                 TestNode(
                     CACHE_NODE_ID,
@@ -769,7 +772,7 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
             self.log.debug("Copy cache directory {} to node {}".format(cache_node_dir, i))
             to_dir = get_datadir_path(self.options.tmpdir, i)
             shutil.copytree(cache_node_dir, to_dir)
-            initialize_datadir(self.options.tmpdir, i, self.chain)  # Overwrite port/rpcport in bitcoin.conf
+            initialize_datadir(self.options.tmpdir, i, self.chain, self.disable_autoconnect)  # Overwrite port/rpcport in bitcoin.conf
 
     def _initialize_chain_clean(self):
         """Initialize empty blockchain for use by the test.
@@ -777,7 +780,7 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         Create an empty blockchain and num_nodes wallets.
         Useful if a test case wants complete control over initialization."""
         for i in range(self.num_nodes):
-            initialize_datadir(self.options.tmpdir, i, self.chain)
+            initialize_datadir(self.options.tmpdir, i, self.chain, self.disable_autoconnect)
 
     def skip_if_no_py3_zmq(self):
         """Attempt to import the zmq package and skip the test if the import fails."""
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 35dbfbba8d..96839abb0e 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -338,17 +338,17 @@ def rpc_url(datadir, i, chain, rpchost):
 ################
 
 
-def initialize_datadir(dirname, n, chain):
+def initialize_datadir(dirname, n, chain, disable_autoconnect=True):
     datadir = get_datadir_path(dirname, n)
     if not os.path.isdir(datadir):
         os.makedirs(datadir)
-    write_config(os.path.join(datadir, "bitcoin.conf"), n=n, chain=chain)
+    write_config(os.path.join(datadir, "bitcoin.conf"), n=n, chain=chain, disable_autoconnect=disable_autoconnect)
     os.makedirs(os.path.join(datadir, 'stderr'), exist_ok=True)
     os.makedirs(os.path.join(datadir, 'stdout'), exist_ok=True)
     return datadir
 
 
-def write_config(config_path, *, n, chain, extra_config=""):
+def write_config(config_path, *, n, chain, extra_config="", disable_autoconnect=True):
     # Translate chain subdirectory name to config name
     if chain == 'testnet3':
         chain_name_conf_arg = 'testnet'
@@ -376,6 +376,8 @@ def write_config(config_path, *, n, chain, extra_config=""):
         f.write("shrinkdebugfile=0\n")
         # To improve SQLite wallet performance so that the tests don't timeout, use -unsafesqlitesync
         f.write("unsafesqlitesync=1\n")
+        if disable_autoconnect:
+            f.write("connect=0\n")
         f.write(extra_config)