Implement support for configurable casemapping & default to ASCII.

docs/conf/inspircd.conf.example

@@ -563,6 +563,14 @@
          # the correct parameters are.
          syntaxhints="no"
 
+         # casemapping: This sets the case mapping method to be used by the
+         # server. This MUST be the same on all servers. Possible values are:
+         # "ascii" (recommended)
+         # "rfc1459" (default, required for linking to 2.0 servers)
+         # NOTE: if you are using the nationalchars module this setting will be
+         # ignored. You should use <nationalchars:casemapping> instead.
+         casemapping="ascii"
+
          # cyclehostsfromuser: If enabled, the source of the mode change for
          # cyclehosts will be the user who cycled. This can look nicer, but
          # triggers anti-takeover mechanisms of some obsolete bots.

include/configreader.h

@@ -424,6 +424,10 @@ class CoreExport ServerConfig
 	 */
 	bool SyntaxHints;
 
+	/** The name of the casemapping method used by this server.
+	 */
+	std::string CaseMapping;
+
 	/** If set to true, the CycleHosts mode change will be sourced from the user,
 	 * rather than the server
 	 */

src/configreader.cpp

@@ -400,6 +400,14 @@ void ServerConfig::Fill()
 		sid = server->getString("id");
 		if (!sid.empty() && !InspIRCd::IsSID(sid))
 			throw CoreException(sid + " is not a valid server ID. A server ID must be 3 characters long, with the first character a digit and the next two characters a digit or letter.");
+
+		CaseMapping = options->getString("casemapping", "rfc1459");
+		if (CaseMapping == "ascii")
+			national_case_insensitive_map = ascii_case_insensitive_map;
+		else if (CaseMapping == "rfc1459")
+			national_case_insensitive_map = rfc_case_insensitive_map;
+		else
+			throw CoreException("<options:casemapping> must be set to 'ascii', or 'rfc1459'");
 	}
 	else
 	{
@@ -410,6 +418,11 @@ void ServerConfig::Fill()
 		std::string nsid = server->getString("id");
 		if (!nsid.empty() && nsid != sid)
 			throw CoreException("You must restart to change the server id");
+
+		std::string casemapping = options->getString("casemapping");
+		if (!casemapping.empty() && casemapping != CaseMapping)
+			throw CoreException("You must restart to change the server casemapping");
+
 	}
 	SoftLimit = ConfValue("performance")->getInt("softlimit", (SocketEngine::GetMaxFds() > 0 ? SocketEngine::GetMaxFds() : LONG_MAX), 10);
 	CCOnConnect = ConfValue("performance")->getBool("clonesonconnect", true);

src/modules/m_nationalchars.cpp

@@ -218,7 +218,7 @@ bool lwbNickHandler::Call(const std::string& nick)
 class ModuleNationalChars : public Module
 {
 	lwbNickHandler myhandler;
-	std::string charset, casemapping;
+	std::string charset;
 	unsigned char m_additional[256], m_additionalUp[256], m_lower[256], m_upper[256];
 	caller1<bool, const std::string&> rememberer;
 	bool forcequit;
@@ -262,18 +262,14 @@ class ModuleNationalChars : public Module
 		ServerInstance->IsNick = &myhandler;
 	}
 
-	void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
-	{
-		tokens["CASEMAPPING"] = casemapping;
-	}
-
 	void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 	{
 		ConfigTag* tag = ServerInstance->Config->ConfValue("nationalchars");
 		charset = tag->getString("file");
-		casemapping = tag->getString("casemapping", FileSystem::GetFileName(charset));
+		std::string casemapping = tag->getString("casemapping", FileSystem::GetFileName(charset));
 		if (casemapping.find(' ') != std::string::npos)
 			throw ModuleException("<nationalchars:casemapping> must not contain any spaces!");
+		ServerInstance->Config->CaseMapping = casemapping;
 #if defined _WIN32
 		if (!FileSystem::StartsWithWindowsDriveLetter(charset))
 			charset.insert(0, "./locales/");

src/modules/m_spanningtree/capab.cpp

@@ -182,6 +182,7 @@ void TreeSocket::SendCapabilities(int phase)
 			" PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 			" CHANMODES="+ServerInstance->Modes->GiveModeList(MODETYPE_CHANNEL)+
 			" USERMODES="+ServerInstance->Modes->GiveModeList(MODETYPE_USER)+
+			" CASEMAPPING="+ServerInstance->Config->CaseMapping+
 			// XXX: Advertise the presence or absence of m_globops in CAPAB CAPABILITIES.
 			// Services want to know about it, and since m_globops was not marked as VF_(OPT)COMMON
 			// in 2.0, we advertise it here to not break linking to previous versions.
@@ -343,6 +344,24 @@ bool TreeSocket::Capab(const parameterlist &params)
 			if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MODETYPE_USER))
 				reason = "One or more of the user modes on the remote server are invalid on this server.";
 		}
+		else
+		{
+			// We default to rfc1459 here because if this key is not sent then
+			// the remote server is running the 2.0 protocol which uses rfc1459
+			// by default.
+			std::string casemapping = "rfc1459";
+			std::map<std::string, std::string>::iterator citer = this->capab->CapKeys.find("CASEMAPPING");
+			if (citer != this->capab->CapKeys.end())
+				casemapping = citer->second;
+
+			if (casemapping != ServerInstance->Config->CaseMapping)
+			{
+				reason = "The casemapping of the remote server differs to that of the local server."
+					" Local casemapping: " + ServerInstance->Config->CaseMapping +
+					" Remote casemapping: " + casemapping;
+			}
+
+		}
 
 		/* Challenge response, store their challenge for our password */
 		std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");

src/server.cpp

@@ -164,7 +164,7 @@ void ISupportManager::Build()
 	std::map<std::string, std::string> tokens;
 
 	tokens["AWAYLEN"] = ConvToStr(ServerInstance->Config->Limits.MaxAway);
-	tokens["CASEMAPPING"] = "rfc1459";
+	tokens["CASEMAPPING"] = ServerInstance->Config->CaseMapping;
 	tokens["CHANLIMIT"] = InspIRCd::Format("#:%u", ServerInstance->Config->MaxChans);
 	tokens["CHANMODES"] = ServerInstance->Modes->GiveModeList(MODETYPE_CHANNEL);
 	tokens["CHANNELLEN"] = ConvToStr(ServerInstance->Config->Limits.ChanMax);