merge bitcoin#22834: respect -onlynet= when making outbound connections

Author: kwvg

doc/i2p.md

@@ -60,11 +60,7 @@ logging` for more information.
 
 Make outgoing connections only to I2P addresses. Incoming connections are not
 affected by this option. It can be specified multiple times to allow multiple
-network types, e.g. onlynet=ipv4, onlynet=ipv6, onlynet=onion, onlynet=i2p.
-
-Warning: if you use -onlynet with values other than onion, and the -onion or
--proxy option is set, then outgoing onion connections will still be made; use
--noonion or -onion=0 to disable outbound onion connections in this case.
+network types, e.g. onlynet=onion, onlynet=i2p.
 
 I2P support was added to Dash Core in version 20.0 and there may be fewer I2P
 peers than Tor or IP ones. Therefore, using I2P alone without other networks may

doc/release-notes-22834.md

@@ -0,0 +1,8 @@
+Updated settings
+----------------
+
+- If `-proxy=` is given together with `-noonion` then the provided proxy will
+  not be set as a proxy for reaching the Tor network. So it will not be
+  possible to open manual connections to the Tor network for example with the
+  `addnode` RPC. To mimic the old behavior use `-proxy=` together with
+  `-onlynet=` listing all relevant networks except `onion`.

doc/tor.md

@@ -51,11 +51,7 @@ outgoing connections, but more is possible.
     -onlynet=onion  Make outgoing connections only to .onion addresses. Incoming
                     connections are not affected by this option. This option can be
                     specified multiple times to allow multiple network types, e.g.
-                    onlynet=ipv4, onlynet=ipv6, onlynet=onion, onlynet=i2p.
-                    Warning: if you use -onlynet with values other than onion, and
-                    the -onion or -proxy option is set, then outgoing onion
-                    connections will still be made; use -noonion or -onion=0 to
-                    disable outbound onion connections in this case.
+                    onlynet=onion, onlynet=i2p.
 
 An example how to start the client if the Tor proxy is running on local host on
 port 9050 and only allows .onion nodes to connect:

src/init.cpp

@@ -584,7 +584,7 @@ void SetupServerArgs(NodeContext& node)
     argsman.AddArg("-onion=<ip:port>", "Use separate SOCKS5 proxy to reach peers via Tor onion services, set -noonion to disable (default: -proxy)", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-i2psam=<ip:port>", "I2P SAM proxy to reach I2P peers and accept I2P connections (default: none)", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-i2pacceptincoming", strprintf("Whether to accept inbound I2P connections (default: %i). Ignored if -i2psam is not set. Listening for inbound I2P connections is done through the SAM proxy, not by binding to a local address and port.", DEFAULT_I2P_ACCEPT_INCOMING), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
-    argsman.AddArg("-onlynet=<net>", "Make outgoing connections only through network <net> (" + Join(GetNetworkNames(), ", ") + "). Incoming connections are not affected by this option. This option can be specified multiple times to allow multiple networks. Warning: if it is used with non-onion networks and the -onion or -proxy option is set, then outbound onion connections will still be made; use -noonion or -onion=0 to disable outbound onion connections in this case.", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
+    argsman.AddArg("-onlynet=<net>", "Make automatic outgoing connections only through network <net> (" + Join(GetNetworkNames(), ", ") + "). Incoming connections are not affected by this option. This option can be specified multiple times to allow multiple networks.", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-peerblockfilters", strprintf("Serve compact block filters to peers per BIP 157 (default: %u)", DEFAULT_PEERBLOCKFILTERS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-peerbloomfilters", strprintf("Support filtering of blocks and transaction with bloom filters (default: %u)", DEFAULT_PEERBLOOMFILTERS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-peertimeout=<n>", strprintf("Specify a p2p connection timeout delay in seconds. After connecting to a peer, wait this amount of time before considering disconnection based on inactivity (minimum: 1, default: %d)", DEFAULT_PEER_CONNECT_TIMEOUT), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
@@ -1797,27 +1797,27 @@ bool AppInitMain(const CoreContext& context, NodeContext& node, interfaces::Bloc
     // Check for host lookup allowed before parsing any network related parameters
     fNameLookup = args.GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
 
+    Proxy onion_proxy;
+
     bool proxyRandomize = args.GetBoolArg("-proxyrandomize", DEFAULT_PROXYRANDOMIZE);
     // -proxy sets a proxy for all outgoing network traffic
     // -noproxy (or -proxy=0) as well as the empty string can be used to not set a proxy, this is the default
     std::string proxyArg = args.GetArg("-proxy", "");
-    SetReachable(NET_ONION, false);
     if (proxyArg != "" && proxyArg != "0") {
         CService proxyAddr;
         if (!Lookup(proxyArg, proxyAddr, 9050, fNameLookup)) {
             return InitError(strprintf(_("Invalid -proxy address or hostname: '%s'"), proxyArg));
         }
 
-        proxyType addrProxy = proxyType(proxyAddr, proxyRandomize);
+        Proxy addrProxy = Proxy(proxyAddr, proxyRandomize);
         if (!addrProxy.IsValid())
             return InitError(strprintf(_("Invalid -proxy address or hostname: '%s'"), proxyArg));
 
         SetProxy(NET_IPV4, addrProxy);
         SetProxy(NET_IPV6, addrProxy);
-        SetProxy(NET_ONION, addrProxy);
         SetProxy(NET_CJDNS, addrProxy);
         SetNameProxy(addrProxy);
-        SetReachable(NET_ONION, true); // by default, -proxy sets onion as reachable, unless -noonion later
+        onion_proxy = addrProxy;
     }
 
     // -onion can be used to set only a proxy for .onion, or override normal proxy for .onion addresses
@@ -1826,18 +1826,26 @@ bool AppInitMain(const CoreContext& context, NodeContext& node, interfaces::Bloc
     std::string onionArg = args.GetArg("-onion", "");
     if (onionArg != "") {
         if (onionArg == "0") { // Handle -noonion/-onion=0
-            SetReachable(NET_ONION, false);
+            onion_proxy = Proxy{};
         } else {
-            CService onionProxy;
-            if (!Lookup(onionArg, onionProxy, 9050, fNameLookup)) {
+            CService addr;
+            if (!Lookup(onionArg, addr, 9050, fNameLookup) || !addr.IsValid()) {
                 return InitError(strprintf(_("Invalid -onion address or hostname: '%s'"), onionArg));
             }
-            proxyType addrOnion = proxyType(onionProxy, proxyRandomize);
-            if (!addrOnion.IsValid())
-                return InitError(strprintf(_("Invalid -onion address or hostname: '%s'"), onionArg));
-            SetProxy(NET_ONION, addrOnion);
-            SetReachable(NET_ONION, true);
+            onion_proxy = Proxy{addr, proxyRandomize};
+        }
+    }
+
+    if (onion_proxy.IsValid()) {
+        SetProxy(NET_ONION, onion_proxy);
+    } else {
+        if (args.IsArgSet("-onlynet") && IsReachable(NET_ONION)) {
+            return InitError(
+                _("Outbound connections restricted to Tor (-onlynet=onion) but the proxy for "
+                  "reaching the Tor network is not provided (no -proxy= and no -onion= given) or "
+                  "it is explicitly forbidden (-onion=0)"));
         }
+        SetReachable(NET_ONION, false);
     }
 
     for (const std::string& strAddr : args.GetArgs("-externalip")) {
@@ -2539,8 +2547,7 @@ bool AppInitMain(const CoreContext& context, NodeContext& node, interfaces::Bloc
         if (!Lookup(i2psam_arg, addr, 7656, fNameLookup) || !addr.IsValid()) {
             return InitError(strprintf(_("Invalid -i2psam address or hostname: '%s'"), i2psam_arg));
         }
-        SetReachable(NET_I2P, true);
-        SetProxy(NET_I2P, proxyType{addr});
+        SetProxy(NET_I2P, Proxy{addr});
     } else {
         SetReachable(NET_I2P, false);
     }

src/interfaces/node.h

@@ -32,7 +32,7 @@ class CNodeStats;
 class Coin;
 class RPCTimerInterface;
 class UniValue;
-class proxyType;
+class Proxy;
 struct bilingual_str;
 enum class SynchronizationState;
 struct CNodeStateStats;
@@ -174,7 +174,7 @@ class Node
     virtual void mapPort(bool use_upnp, bool use_natpmp) = 0;
 
     //! Get proxy.
-    virtual bool getProxy(Network net, proxyType& proxy_info) = 0;
+    virtual bool getProxy(Network net, Proxy& proxy_info) = 0;
 
     //! Get number of connections.
     virtual size_t getNodeCount(ConnectionDirection flags) = 0;

src/net.cpp

@@ -492,7 +492,7 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
     // Connect
     bool connected = false;
     std::unique_ptr<Sock> sock;
-    proxyType proxy;
+    Proxy proxy;
     CAddress addr_bind;
     assert(!addr_bind.IsValid());
     std::unique_ptr<i2p::sam::Session> i2p_transient_session;
@@ -3397,7 +3397,7 @@ bool CConnman::Start(CDeterministicMNManager& dmnman, CMasternodeMetaMan& mn_met
         return false;
     }
 
-    proxyType i2p_sam;
+    Proxy i2p_sam;
     if (GetProxy(NET_I2P, i2p_sam) && connOptions.m_i2p_accept_incoming) {
         m_i2p_sam_session = std::make_unique<i2p::sam::Session>(GetDataDir() / "i2p_private_key",
                                                                 i2p_sam.proxy, &interruptNet);

src/netbase.cpp

@@ -30,8 +30,8 @@
 
 // Settings
 static Mutex g_proxyinfo_mutex;
-static proxyType proxyInfo[NET_MAX] GUARDED_BY(g_proxyinfo_mutex);
-static proxyType nameProxy GUARDED_BY(g_proxyinfo_mutex);
+static Proxy proxyInfo[NET_MAX] GUARDED_BY(g_proxyinfo_mutex);
+static Proxy nameProxy GUARDED_BY(g_proxyinfo_mutex);
 int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
 bool fNameLookup = DEFAULT_NAME_LOOKUP;
 
@@ -604,7 +604,7 @@ bool ConnectSocketDirectly(const CService &addrConnect, const Sock& sock, int nT
     return true;
 }
 
-bool SetProxy(enum Network net, const proxyType &addrProxy) {
+bool SetProxy(enum Network net, const Proxy &addrProxy) {
     assert(net >= 0 && net < NET_MAX);
     if (!addrProxy.IsValid())
         return false;
@@ -613,7 +613,7 @@ bool SetProxy(enum Network net, const proxyType &addrProxy) {
     return true;
 }
 
-bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
+bool GetProxy(enum Network net, Proxy &proxyInfoOut) {
     assert(net >= 0 && net < NET_MAX);
     LOCK(g_proxyinfo_mutex);
     if (!proxyInfo[net].IsValid())
@@ -622,15 +622,15 @@ bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
     return true;
 }
 
-bool SetNameProxy(const proxyType &addrProxy) {
+bool SetNameProxy(const Proxy &addrProxy) {
     if (!addrProxy.IsValid())
         return false;
     LOCK(g_proxyinfo_mutex);
     nameProxy = addrProxy;
     return true;
 }
 
-bool GetNameProxy(proxyType &nameProxyOut) {
+bool GetNameProxy(Proxy &nameProxyOut) {
     LOCK(g_proxyinfo_mutex);
     if(!nameProxy.IsValid())
         return false;
@@ -652,7 +652,7 @@ bool IsProxy(const CNetAddr &addr) {
     return false;
 }
 
-bool ConnectThroughProxy(const proxyType& proxy, const std::string& strDest, uint16_t port, const Sock& sock, int nTimeout, bool& outProxyConnectionFailed)
+bool ConnectThroughProxy(const Proxy& proxy, const std::string& strDest, uint16_t port, const Sock& sock, int nTimeout, bool& outProxyConnectionFailed)
 {
     // first connect to proxy server
     if (!ConnectSocketDirectly(proxy.proxy, sock, nTimeout, true)) {

src/netbase.h

@@ -49,11 +49,11 @@ static inline bool operator&(ConnectionDirection a, ConnectionDirection b) {
     return (underlying(a) & underlying(b));
 }
 
-class proxyType
+class Proxy
 {
 public:
-    proxyType(): randomize_credentials(false) {}
-    explicit proxyType(const CService &_proxy, bool _randomize_credentials=false): proxy(_proxy), randomize_credentials(_randomize_credentials) {}
+    Proxy(): randomize_credentials(false) {}
+    explicit Proxy(const CService &_proxy, bool _randomize_credentials=false): proxy(_proxy), randomize_credentials(_randomize_credentials) {}
 
     bool IsValid() const { return proxy.IsValid(); }
 
@@ -77,8 +77,8 @@ enum Network ParseNetwork(const std::string& net);
 std::string GetNetworkName(enum Network net);
 /** Return a vector of publicly routable Network names; optionally append NET_UNROUTABLE. */
 std::vector<std::string> GetNetworkNames(bool append_unroutable = false);
-bool SetProxy(enum Network net, const proxyType &addrProxy);
-bool GetProxy(enum Network net, proxyType &proxyInfoOut);
+bool SetProxy(enum Network net, const Proxy &addrProxy);
+bool GetProxy(enum Network net, Proxy &proxyInfoOut);
 bool IsProxy(const CNetAddr &addr);
 /**
  * Set the name proxy to use for all connections to nodes specified by a
@@ -96,9 +96,9 @@ bool IsProxy(const CNetAddr &addr);
  *       server in common use (most notably Tor) actually implements UDP
  *       support, and a DNS resolver is beyond the scope of this project.
  */
-bool SetNameProxy(const proxyType &addrProxy);
+bool SetNameProxy(const Proxy &addrProxy);
 bool HaveNameProxy();
-bool GetNameProxy(proxyType &nameProxyOut);
+bool GetNameProxy(Proxy &nameProxyOut);
 
 using DNSLookupFn = std::function<std::vector<CNetAddr>(const std::string&, bool)>;
 extern DNSLookupFn g_dns_lookup;
@@ -223,7 +223,7 @@ bool ConnectSocketDirectly(const CService &addrConnect, const Sock& sock, int nT
  *
  * @returns Whether or not the operation succeeded.
  */
-bool ConnectThroughProxy(const proxyType& proxy, const std::string& strDest, uint16_t port, const Sock& sock, int nTimeout, bool& outProxyConnectionFailed);
+bool ConnectThroughProxy(const Proxy& proxy, const std::string& strDest, uint16_t port, const Sock& sock, int nTimeout, bool& outProxyConnectionFailed);
 
 /** Enable non-blocking mode for a socket */
 bool SetSocketNonBlocking(const SOCKET& hSocket);

src/node/interfaces.cpp

@@ -341,7 +341,7 @@ class NodeImpl : public Node
     }
     bool shutdownRequested() override { return ShutdownRequested(); }
     void mapPort(bool use_upnp, bool use_natpmp) override { StartMapPort(use_upnp, use_natpmp); }
-    bool getProxy(Network net, proxyType& proxy_info) override { return GetProxy(net, proxy_info); }
+    bool getProxy(Network net, Proxy& proxy_info) override { return GetProxy(net, proxy_info); }
     size_t getNodeCount(ConnectionDirection flags) override
     {
         return m_context->connman ? m_context->connman->GetNodeCount(flags) : 0;

src/qt/clientmodel.cpp

@@ -381,7 +381,7 @@ void ClientModel::unsubscribeFromCoreSignals()
 
 bool ClientModel::getProxyInfo(std::string& ip_port) const
 {
-    proxyType ipv4, ipv6;
+    Proxy ipv4, ipv6;
     if (m_node.getProxy((Network) 1, ipv4) && m_node.getProxy((Network) 2, ipv6)) {
       ip_port = ipv4.proxy.ToStringIPPort();
       return true;