Merge #19112: rpc: Remove special case for unknown service flags

fa1433a rpc: Remove special case for unknown service flags (MarcoFalke)

Pull request description:

  The special case to return a bit as an integer is clumsy and undocumented. Probably also irrelevant because there shouldn't currently be a non-misbehaving client that connects to Bitcoin Core and advertises an unknown service flag.

  Thus, simply remove the code.

ACKs for top commit:
  laanwj:
    ACK fa1433a

Tree-SHA512: 942de6a577a9ee076ce12c92be121617640d53ee8c3424064c45a30a7ff789555d3722a4203670768faf81da2a40adfed3ec5cdeb5da06f04be81ddb53b9db7e

Author: laanwj

src/protocol.cpp

@@ -5,8 +5,8 @@
 
 #include <protocol.h>
 
-#include <util/system.h>
 #include <util/strencodings.h>
+#include <util/system.h>
 
 #ifndef WIN32
 # include <arpa/inet.h>
@@ -220,11 +220,7 @@ static std::string serviceFlagToStr(size_t bit)
     std::ostringstream stream;
     stream.imbue(std::locale::classic());
     stream << "UNKNOWN[";
-    if (bit < 8) {
-        stream << service_flag;
-    } else {
-        stream << "2^" << bit;
-    }
+    stream << "2^" << bit;
     stream << "]";
     return stream.str();
 }

test/functional/rpc_net.py

@@ -28,6 +28,7 @@
     NODE_WITNESS,
 )
 
+
 def assert_net_servicesnames(servicesflag, servicenames):
     """Utility that checks if all flags are correctly decoded in
     `getpeerinfo` and `getnetworkinfo`.
@@ -40,6 +41,7 @@ def assert_net_servicesnames(servicesflag, servicenames):
         servicesflag_generated |= getattr(test_framework.messages, 'NODE_' + servicename)
     assert servicesflag_generated == servicesflag
 
+
 class NetTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
@@ -57,6 +59,7 @@ def run_test(self):
         self._test_getnetworkinfo()
         self._test_getaddednodeinfo()
         self._test_getpeerinfo()
+        self.test_service_flags()
         self._test_getnodeaddresses()
 
     def _test_connection_count(self):
@@ -139,6 +142,11 @@ def _test_getpeerinfo(self):
         for info in peer_info:
             assert_net_servicesnames(int(info[0]["services"], 0x10), info[0]["servicesnames"])
 
+    def test_service_flags(self):
+        self.nodes[0].add_p2p_connection(P2PInterface(), services=(1 << 4) | (1 << 63))
+        assert_equal(['UNKNOWN[2^4]', 'UNKNOWN[2^63]'], self.nodes[0].getpeerinfo()[-1]['servicesnames'])
+        self.nodes[0].disconnect_p2ps()
+
     def _test_getnodeaddresses(self):
         self.nodes[0].add_p2p_connection(P2PInterface())
 
@@ -174,5 +182,6 @@ def _test_getnodeaddresses(self):
         node_addresses = self.nodes[0].getnodeaddresses(LARGE_REQUEST_COUNT)
         assert_greater_than(LARGE_REQUEST_COUNT, len(node_addresses))
 
+
 if __name__ == '__main__':
     NetTest().main()