Merge #17785: p2p: Unify Send and Receive protocol versions

ddefb5c0b759950942ac03f28c43b548af7b4033 p2p: Use the greatest common version in peer logic (Hennadii Stepanov)
e084d45562b94827b3a7873895882fcaae9f4d48 p2p: Remove SetCommonVersion() from VERACK handler (Hennadii Stepanov)
8d2026796a6f7add0c2cda9806e759817d1eae6f refactor: Rename local variable nSendVersion (Hennadii Stepanov)
e9a6d8b13b0558b17cdafbd32fd2663b4138ff11 p2p: Unify Send and Receive protocol versions (Hennadii Stepanov)

Pull request description:

  On master (6fef85bfa3cd7f76e83b8b57f9e4acd63eb664ec) `CNode` has two members to keep protocol version:
  - `nRecvVersion` for received messages
  - `nSendVersion` for messages to send

  After exchanging with `VERSION` and `VERACK` messages via protocol version `INIT_PROTO_VERSION`, both nodes set `nRecvVersion` _and_ `nSendVersion` to _the same_ value which is the greatest common protocol version.

  This PR:
  - replaces two `CNode` members, `nRecvVersion` `nSendVersion`, with `m_greatest_common_version`
  - removes duplicated getter and setter

  There is no change in behavior on the P2P network.

ACKs for top commit:
  jnewbery:
    ACK ddefb5c0b759950942ac03f28c43b548af7b4033
  naumenkogs:
    ACK ddefb5c0b759950942ac03f28c43b548af7b4033
  fjahr:
    Code review ACK ddefb5c0b759950942ac03f28c43b548af7b4033
  amitiuttarwar:
    code review but untested ACK ddefb5c0b7
  benthecarman:
    utACK `ddefb5c`

Tree-SHA512: 5305538dbaa5426b923b0afd20bdef4f248d310855d1d78427210c00716c67b7cb691515c421716b6157913e453076e293b10ff5fd2cd26a8e5375d42da7809d

1 files changed, 5 insertions, 5 deletions

diff --git a/src/test/denialofservice_tests.cpp b/src/test/denialofservice_tests.cpp
index e4ee08db61..712567ac0d 100644
--- a/src/test/denialofservice_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -85,7 +85,7 @@ BOOST_AUTO_TEST_CASE(outbound_slow_chain_eviction)
     // Mock an outbound peer
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
     CNode dummyNode1(id++, ServiceFlags(NODE_NETWORK | NODE_WITNESS), 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", ConnectionType::OUTBOUND_FULL_RELAY);
-    dummyNode1.SetSendVersion(PROTOCOL_VERSION);
+    dummyNode1.SetCommonVersion(PROTOCOL_VERSION);
 
     peerLogic->InitializeNode(&dummyNode1);
     dummyNode1.nVersion = 1;
@@ -138,7 +138,7 @@ static void AddRandomOutboundPeer(std::vector<CNode *> &vNodes, PeerManager &pee
     CAddress addr(ip(g_insecure_rand_ctx.randbits(32)), NODE_NONE);
     vNodes.emplace_back(new CNode(id++, ServiceFlags(NODE_NETWORK | NODE_WITNESS), 0, INVALID_SOCKET, addr, 0, 0, CAddress(), "", ConnectionType::OUTBOUND_FULL_RELAY));
     CNode &node = *vNodes.back();
-    node.SetSendVersion(PROTOCOL_VERSION);
+    node.SetCommonVersion(PROTOCOL_VERSION);
 
     peerLogic.InitializeNode(&node);
     node.nVersion = 1;
@@ -229,7 +229,7 @@ BOOST_AUTO_TEST_CASE(peer_discouragement)
     banman->ClearBanned();
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
     CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", ConnectionType::INBOUND);
-    dummyNode1.SetSendVersion(PROTOCOL_VERSION);
+    dummyNode1.SetCommonVersion(PROTOCOL_VERSION);
     peerLogic->InitializeNode(&dummyNode1);
     dummyNode1.nVersion = 1;
     dummyNode1.fSuccessfullyConnected = true;
@@ -243,7 +243,7 @@ BOOST_AUTO_TEST_CASE(peer_discouragement)
 
     CAddress addr2(ip(0xa0b0c002), NODE_NONE);
     CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, 1, 1, CAddress(), "", ConnectionType::INBOUND);
-    dummyNode2.SetSendVersion(PROTOCOL_VERSION);
+    dummyNode2.SetCommonVersion(PROTOCOL_VERSION);
     peerLogic->InitializeNode(&dummyNode2);
     dummyNode2.nVersion = 1;
     dummyNode2.fSuccessfullyConnected = true;
@@ -280,7 +280,7 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
 
     CAddress addr(ip(0xa0b0c001), NODE_NONE);
     CNode dummyNode(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr, 4, 4, CAddress(), "", ConnectionType::INBOUND);
-    dummyNode.SetSendVersion(PROTOCOL_VERSION);
+    dummyNode.SetCommonVersion(PROTOCOL_VERSION);
     peerLogic->InitializeNode(&dummyNode);
     dummyNode.nVersion = 1;
     dummyNode.fSuccessfullyConnected = true;