add support for draft/network-icon

doc/reference.conf

@@ -158,6 +158,7 @@
 #loadmodule "extensions/m_sendbans";
 #loadmodule "extensions/m_shedding";
 #loadmodule "extensions/m_webirc";
+#loadmodule "extensions/network_icon";
 #loadmodule "extensions/no_kill_services";
 #loadmodule "extensions/no_locops";
 #loadmodule "extensions/no_oper_invis";
@@ -1535,6 +1536,9 @@ general {
 	 * requires extensions/drain to be loaded.
 	 */
 	drain_reason = "This server is not accepting connections.";
+
+	/* network_icon_url: add a URL to an icon representing the network. */
+	#network_icon_url = "https://example.org/icon.png";
 };
 
 modules {

extensions/Makefile.am

@@ -57,6 +57,7 @@ extension_LTLIBRARIES =		\
   m_sendbans.la			\
   m_shedding.la			\
   m_webirc.la			\
+  network_icon.la		\
   no_kill_services.la		\
   no_locops.la			\
   no_oper_invis.la		\

extensions/meson.build

@@ -50,6 +50,7 @@ extension_modules = [
   'm_sendbans',
   'm_shedding',
   'm_webirc',
+  'network_icon',
   'no_kill_services',
   'no_locops',
   'no_oper_invis',

extensions/network_icon.c

@@ -0,0 +1,71 @@
+/*
+ *  Solanum: a slightly advanced ircd
+ *  network_icon.c: Advertise a network icon.
+ *
+ *  Copyright (C) 2026 internet-catte
+ *
+ *  This program 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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ *  USA
+ */
+
+#include "stdinc.h"
+#include "modules.h"
+#include "newconf.h"
+#include "supported.h"
+
+static const char network_icon_desc[] = "Provides the draft/ICON ISUPPORT token for clients that support showing a network icon";
+
+static int modinit(void);
+static void moddeinit(void);
+static void network_icon_init_conf(void *data);
+static void network_icon_conf_set_url(void *data);
+
+static char *network_icon_url = NULL;
+
+mapi_hfn_list_av1 network_icon_hfnlist[] = {
+	{ "conf_read_start", network_icon_init_conf },
+};
+
+DECLARE_MODULE_AV2(network_icon, modinit, moddeinit, NULL, NULL, network_icon_hfnlist, NULL, NULL, network_icon_desc);
+
+static int
+modinit(void)
+{
+	add_conf_item("general", "network_icon_url", CF_QSTRING, network_icon_conf_set_url);
+	add_isupport("draft/ICON", isupport_stringptr, &network_icon_url);
+	return 0;
+}
+
+static void
+moddeinit(void)
+{
+	delete_isupport("draft/ICON");
+	rb_free(network_icon_url);
+	remove_conf_item("general", "network_icon_url");
+}
+
+static void
+network_icon_init_conf(void *data)
+{
+	rb_free(network_icon_url);
+	network_icon_url = NULL;
+}
+
+static void
+network_icon_conf_set_url(void *data)
+{
+	rb_free(network_icon_url);
+	network_icon_url = rb_strdup(data);
+}