Import the blocksock module.

3/m_blocksock.cpp

@@ -0,0 +1,71 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2021 Sadie Powell <[email protected]>
+ *
+ * This file is part of InspIRCd.  InspIRCd is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/// $ModAuthor: Sadie Powell
+/// $ModAuthorMail: [email protected]
+/// $ModDepends: core 3
+/// $ModDesc: Allows blocking IP addresses from making any socket connections to the server.
+
+
+#include "inspircd.h"
+
+class ModuleBlockSock : public Module
+{
+ private:
+	bool FindRange(const std::string& rangelist, const irc::sockets::sockaddrs& sa)
+	{
+		if (rangelist.empty())
+			return false; // No ranges set.
+
+		irc::spacesepstream rangestream(rangelist);
+		const std::string sastr = sa.str();
+		for (std::string range; rangestream.GetToken(range); )
+		{
+			if (InspIRCd::Match(sastr, range, ascii_case_insensitive_map) || irc::sockets::cidr_mask(range).match(sa))
+				return true; // Matches the range.
+		}
+
+		// No range matched.
+		return false;
+	}
+
+ public:
+	void Prioritize() CXX11_OVERRIDE
+	{
+		ServerInstance->Modules->SetPriority(this, I_OnAcceptConnection, PRIORITY_FIRST);
+	}
+
+	ModResult OnAcceptConnection(int, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
+	{
+		const std::string whiteliststr = from->bind_tag->getString("whitelist");
+		if (!FindRange(whiteliststr, *client))
+		{
+			const std::string blackliststr = from->bind_tag->getString("blacklist");
+			if (FindRange(blackliststr, *client))
+				return MOD_RES_DENY;
+		}
+		return MOD_RES_PASSTHRU;
+	}
+
+	Version GetVersion() CXX11_OVERRIDE
+	{
+		return Version("Allows blocking IP addresses from making any socket connections to the server.");
+	}
+};
+
+MODULE_INIT(ModuleBlockSock)