Add rewritten m_cap module

- Caps are now managed by m_cap
- Each cap uses one bit in an extension item shared with other caps

1 files changed, 245 insertions, 0 deletions

diff --git a/src/modules/m_cap.cpp b/src/modules/m_cap.cpp
new file mode 100644
index 000000000..9e857ad28
--- /dev/null
+++ b/src/modules/m_cap.cpp
@@ -0,0 +1,245 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2015 Attila Molnar <attilamolnar@hush.com>
+ *
+ * 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/>.
+ */
+
+
+#include "inspircd.h"
+#include "modules/cap.h"
+
+namespace Cap
+{
+	class ManagerImpl;
+}
+
+class Cap::ManagerImpl : public Cap::Manager
+{
+	typedef insp::flat_map<std::string, Capability*, irc::insensitive_swo> CapMap;
+
+	ExtItem capext;
+	CapMap caps;
+
+	Capability::Bit AllocateBit() const
+	{
+		Capability::Bit used = 0;
+		for (CapMap::const_iterator i = caps.begin(); i != caps.end(); ++i)
+		{
+			Capability* cap = i->second;
+			used |= cap->GetMask();
+		}
+
+		for (unsigned int i = 0; i < MAX_CAPS; i++)
+		{
+			Capability::Bit bit = (1 << i);
+			if (!(used & bit))
+				return bit;
+		}
+		throw ModuleException("Too many caps");
+	}
+
+ public:
+	ManagerImpl(Module* mod)
+		: Cap::Manager(mod)
+		, capext("caps", ExtensionItem::EXT_USER, mod)
+	{
+	}
+
+	~ManagerImpl()
+	{
+		for (CapMap::iterator i = caps.begin(); i != caps.end(); ++i)
+		{
+			Capability* cap = i->second;
+			cap->Unregister();
+		}
+	}
+
+	void AddCap(Cap::Capability* cap) CXX11_OVERRIDE
+	{
+		// No-op if the cap is already registered.
+		// This allows modules to call SetActive() on a cap without checking if it's active first.
+		if (cap->IsRegistered())
+			return;
+
+		ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Registering cap %s", cap->GetName().c_str());
+		cap->bit = AllocateBit();
+		cap->extitem = &capext;
+		caps.insert(std::make_pair(cap->GetName(), cap));
+	}
+
+	void DelCap(Cap::Capability* cap) CXX11_OVERRIDE
+	{
+		// No-op if the cap is not registered, see AddCap() above
+		if (!cap->IsRegistered())
+			return;
+
+		ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Unregistering cap %s", cap->GetName().c_str());
+
+		// Turn off the cap for all users
+		const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
+		for (UserManager::LocalList::const_iterator i = list.begin(); i != list.end(); ++i)
+		{
+			LocalUser* user = *i;
+			cap->set(user, false);
+		}
+
+		cap->Unregister();
+		caps.erase(cap->GetName());
+	}
+
+	Capability* Find(const std::string& capname) const CXX11_OVERRIDE
+	{
+		CapMap::const_iterator it = caps.find(capname);
+		if (it != caps.end())
+			return it->second;
+		return NULL;
+	}
+
+	bool HandleReq(LocalUser* user, const std::string& reqlist)
+	{
+		Ext usercaps = capext.get(user);
+		irc::spacesepstream ss(reqlist);
+		for (std::string capname; ss.GetToken(capname); )
+		{
+			bool remove = (capname[0] == '-');
+			if (remove)
+				capname.erase(capname.begin());
+
+			Capability* cap = ManagerImpl::Find(capname);
+			if (!cap)
+				return false;
+
+			if (remove)
+				usercaps = cap->DelFromMask(usercaps);
+			else
+				usercaps = cap->AddToMask(usercaps);
+		}
+
+		capext.set(user, usercaps);
+		return true;
+	}
+
+	void HandleList(std::string& out, LocalUser* user, bool show_all, bool minus_prefix = false) const
+	{
+		Ext show_caps = (show_all ? ~0 : capext.get(user));
+
+		for (CapMap::const_iterator i = caps.begin(); i != caps.end(); ++i)
+		{
+			Capability* cap = i->second;
+			if (!(show_caps & cap->GetMask()))
+				continue;
+
+			if (minus_prefix)
+				out.push_back('-');
+			out.append(cap->GetName()).push_back(' ');
+		}
+	}
+
+	void HandleClear(LocalUser* user, std::string& result)
+	{
+		HandleList(result, user, false, true);
+		capext.unset(user);
+	}
+};
+
+class CommandCap : public SplitCommand
+{
+	Cap::ManagerImpl manager;
+
+	static void DisplayResult(LocalUser* user, std::string& result)
+	{
+		if (result.size() > 5)
+			result.erase(result.end()-1);
+		user->WriteCommand("CAP", result);
+	}
+
+ public:
+	LocalIntExt holdext;
+
+	CommandCap(Module* mod)
+		: SplitCommand(mod, "CAP", 1)
+		, manager(mod)
+		, holdext("cap_hold", ExtensionItem::EXT_USER, mod)
+	{
+		works_before_reg = true;
+	}
+
+	CmdResult HandleLocal(const std::vector<std::string>& parameters, LocalUser* user) CXX11_OVERRIDE
+	{
+		if (user->registered != REG_ALL)
+			holdext.set(user, 1);
+
+		std::string subcommand(parameters[0].length(), ' ');
+		std::transform(parameters[0].begin(), parameters[0].end(), subcommand.begin(), ::toupper);
+
+		if (subcommand == "REQ")
+		{
+			if (parameters.size() < 2)
+				return CMD_FAILURE;
+
+			std::string result = (manager.HandleReq(user, parameters[1]) ? "ACK :" : "NAK :");
+			result.append(parameters[1]);
+			user->WriteCommand("CAP", result);
+		}
+		else if (subcommand == "END")
+		{
+			holdext.unset(user);
+		}
+		else if ((subcommand == "LS") || (subcommand == "LIST"))
+		{
+			const bool is_ls = (subcommand.length() == 2);
+
+			std::string result = subcommand + " :";
+			manager.HandleList(result, user, is_ls);
+			DisplayResult(user, result);
+		}
+		else if (subcommand == "CLEAR")
+		{
+			std::string result = "ACK :";
+			manager.HandleClear(user, result);
+			DisplayResult(user, result);
+		}
+		else
+		{
+			user->WriteNumeric(ERR_INVALIDCAPSUBCOMMAND, "%s :Invalid CAP subcommand", subcommand.c_str());
+			return CMD_FAILURE;
+		}
+
+		return CMD_SUCCESS;
+	}
+};
+
+class ModuleCap : public Module
+{
+	CommandCap cmd;
+
+ public:
+	ModuleCap()
+		: cmd(this)
+	{
+	}
+
+	ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
+	{
+		return (cmd.holdext.get(user) ? MOD_RES_DENY : MOD_RES_PASSTHRU);
+	}
+
+	Version GetVersion() CXX11_OVERRIDE
+	{
+		return Version("Provides support for CAP capability negotiation", VF_VENDOR);
+	}
+};
+
+MODULE_INIT(ModuleCap)