Create display-name.c

Author: ValwareIRC

files/display-name.c

@@ -0,0 +1,117 @@
+/*
+  Licence: GPLv3 or later
+  Copyright Ⓒ 2022 Valerie Pond
+  draft/display-name
+
+*/
+/*** <<<MODULE MANAGER START>>>
+module
+{
+		documentation "https://github.com/ValwareIRC/valware-unrealircd-mods/blob/main/display-name/README.md";
+		troubleshooting "In case of problems, documentation or e-mail me at [email protected]";
+		min-unrealircd-version "6.*";
+		max-unrealircd-version "6.*";
+		post-install-text {
+				"The module is installed. Now all you need to do is add a loadmodule line:";
+				"loadmodule \"third/display-name\";";
+				"You need to restart your server for this to show up in CLIENTTAGDENY";
+				"The module does not need any other configuration.";
+		}
+}
+*** <<<MODULE MANAGER END>>>
+*/
+
+#define MTAG_DISPLAYNAME "+draft/display-name"
+#include "unrealircd.h"
+
+ModuleHeader MOD_HEADER =
+{
+	"third/display-name",
+	"1.0",
+	"+draft/display-name (IRCv3)",
+	"Valware",
+	"unrealircd-6",
+};
+int i3display_name_mtag_is_ok(Client *client, const char *name, const char *value);
+void mtag_add_i3_display_name(Client *client, MessageTag *recv_mtags, MessageTag **mtag_list, const char *signature);
+int IsValidDisplayName(Client *client, const char *value);
+
+MOD_INIT()
+{
+	MessageTagHandlerInfo mtag;
+
+	MARK_AS_GLOBAL_MODULE(modinfo);
+
+	memset(&mtag, 0, sizeof(mtag));
+	mtag.is_ok = i3display_name_mtag_is_ok;
+	mtag.flags = MTAG_HANDLER_FLAGS_NO_CAP_NEEDED;
+	mtag.name = MTAG_DISPLAYNAME;
+	MessageTagHandlerAdd(modinfo->handle, &mtag);
+
+	HookAddVoid(modinfo->handle, HOOKTYPE_NEW_MESSAGE, 0, mtag_add_i3_display_name);
+	
+
+	return MOD_SUCCESS;
+}
+
+MOD_LOAD()
+{
+	return MOD_SUCCESS;
+}
+
+MOD_UNLOAD()
+{
+	return MOD_SUCCESS;
+}
+
+int i3display_name_mtag_is_ok(Client *client, const char *name, const char *value)
+{
+	/* we COULD return IsValidDisplayName() direcly but I don't like that. */
+	int IsValid = IsValidDisplayName(client,value);
+	return IsValid;
+}
+
+void mtag_add_i3_display_name(Client *client, MessageTag *recv_mtags, MessageTag **mtag_list, const char *signature)
+{
+	MessageTag *m;
+
+	if (IsUser(client))
+	{
+		m = find_mtag(recv_mtags, MTAG_DISPLAYNAME);
+		if (m)
+		{
+			m = duplicate_mtag(m);
+			AddListItem(m, *mtag_list);
+		}
+	}
+}
+
+int IsValidDisplayName(Client *client, const char *value)
+{
+	if (BadPtr(value))
+	{
+		sendto_one(client, NULL, "FAIL * DISPLAY_NAME_ERRONEOUS :Your display-name cannot be empty.");
+		return 0;
+	}
+	const char *illegalchars = "!+%@&~#$:'\"?*,.";
+	const char *p;
+	if (strstr(value,"\n") || strstr(value,"\r"))
+	{
+		sendto_one(client, NULL, "FAIL * DISPLAY_NAME_ERRONEOUS :The display-name you used contained an illegal character");
+		return 0;
+	}
+	for (p = value; *p; p++)
+	{
+		if (strchr(illegalchars, *p))
+		{
+			sendto_one(client, NULL, "FAIL * DISPLAY_NAME_ERRONEOUS :The display-name you used contained an illegal character (%s).",illegalchars);
+			return 0;
+		}
+	}
+	if (strlen(value) > NICKLEN)
+	{
+		sendto_one(client, NULL, "FAIL * DISPLAY_NAME_TOO_LONG :The display-name you used exceeded the maximum length and was not included. (Maximum length: %d)", NICKLEN);
+		return 0;
+	}
+	return 1;
+}