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Merge bitcoin/bitcoin#22112: Force port 0 in I2P

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4101ec9d2e doc: mention that we enforce port=0 in I2P (Vasil Dimov)
e0a2b390c1 addrman: reset I2P ports to 0 when loading from disk (Vasil Dimov)
41cda9d075 test: ensure I2P ports are handled as expected (Vasil Dimov)
4f432bd738 net: do not connect to I2P hosts on port!=0 (Vasil Dimov)
1f096f091e net: distinguish default port per network (Vasil Dimov)
aeac3bce3e net: change I2P seeds' ports to 0 (Vasil Dimov)
38f900290c net: change assumed I2P port to 0 (Vasil Dimov)

Pull request description:

  _This is an alternative to https://github.com/bitcoin/bitcoin/pull/21514, inspired by https://github.com/bitcoin/bitcoin/pull/21514#issuecomment-815049933. They are mutually exclusive. Just one of them should be merged._

  Change assumed ports for I2P to 0 (instead of the default 8333) as this is closer to what actually happens underneath with SAM 3.1 (https://github.com/bitcoin/bitcoin/pull/21514#issuecomment-812632520, https://github.com/bitcoin/bitcoin/pull/21514#issuecomment-816564719).

  Don't connect to I2P peers with advertised port != 0 (we don't specify a port to our SAM 3.1 proxy and it always connects to port = 0).

  Note, this change:
  * Keeps I2P addresses with port != 0 in addrman and relays them to others via P2P gossip. There may be non-bitcoin-core-22.0 peers using SAM 3.2 and for them such addresses may be useful.
  * Silently refuses to connect to I2P hosts with port != 0. This is ok for automatically chosen peers from addrman. Not so ok for peers provided via `-addnode` or `-connect` - a user who specifies `foo.b32.i2p:1234` (non zero port) may wonder why "nothing is happening".

  Fixes #21389

ACKs for top commit:
  laanwj:
    Code review ACK 4101ec9d2e
  jonatack:
    re-ACK 4101ec9d2e per `git range-diff efff9c3 0b0ee03 4101ec9`, built with DDEBUG_ADDRMAN, did fairly extensive testing on mainnet both with and without a peers.dat / -dnsseeds=0 to test boostrapping.

Tree-SHA512: 0e3c019e1dc05e54f559275859d3450e0c735596d179e30b66811aad9d5b5fabe3dcc44571e8f7b99f9fe16453eee393d6e153454dd873b9ff14907d4e6354fe
This commit is contained in:
W. J. van der Laan
2021-07-13 14:19:19 +02:00
parent 7e1ba37b5d 4101ec9d2e
commit d8f1e1327f
13 changed files with 329 additions and 22 deletions
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8
src/net.cpp
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@@ -402,7 +402,8 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
pszDest ? 0.0 : (double)(GetAdjustedTime() - addrConnect.nTime)/3600.0);
// Resolve
const uint16_t default_port{Params().GetDefaultPort()};
const uint16_t default_port{pszDest != nullptr ? Params().GetDefaultPort(pszDest) :
Params().GetDefaultPort()};
if (pszDest) {
std::vector<CService> resolved;
if (Lookup(pszDest, resolved, default_port, fNameLookup && !HaveNameProxy(), 256) && !resolved.empty()) {
@@ -2059,8 +2060,9 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
// from advertising themselves as a service on another host and
// port, causing a DoS attack as nodes around the network attempt
// to connect to it fruitlessly.
if (addr.GetPort() != Params().GetDefaultPort() && nTries < 50)
if (addr.GetPort() != Params().GetDefaultPort(addr.GetNetwork()) && nTries < 50) {
continue;
}
addrConnect = addr;
break;
@@ -2123,7 +2125,7 @@ std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo() const
}
for (const std::string& strAddNode : lAddresses) {
CService service(LookupNumeric(strAddNode, Params().GetDefaultPort()));
CService service(LookupNumeric(strAddNode, Params().GetDefaultPort(strAddNode)));
AddedNodeInfo addedNode{strAddNode, CService(), false, false};
if (service.IsValid()) {
// strAddNode is an IP:port