From c330aa6250871c4d5c3ecf2f20e6dfa30be08ab0 Mon Sep 17 00:00:00 2001
From: Sadie Powell
Date: Thu, 4 May 2023 16:24:08 +0100
Subject: Check whether IPPROTO_SCTP works before trying to implicitly
 multistack.

Fixes bind warnings on platforms which have IPPROTO_SCTP defined but
don't actually have support at runtime.
---
 src/socket.cpp | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'src/socket.cpp')

diff --git a/src/socket.cpp b/src/socket.cpp
index 2dc94b85f..12f9fabda 100644
--- a/src/socket.cpp
+++ b/src/socket.cpp
@@ -33,6 +33,23 @@
 
 #include "inspircd.h"
 
+namespace
+{
+	// Checks whether the system can create SCTP sockets.
+	bool CanCreateSCTPSocket()
+	{
+#ifdef IPPROTO_SCTP
+		int fd = socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP);
+		if (fd >= 0)
+		{
+			SocketEngine::Close(fd);
+			return true;
+		}
+#endif
+		return false;
+	}
+}
+
 bool InspIRCd::BindPort(const std::shared_ptr<ConfigTag>& tag, const irc::sockets::sockaddrs& sa, std::vector<ListenSocket*>& old_ports, int protocol)
 {
 	for (std::vector<ListenSocket*>::iterator n = old_ports.begin(); n != old_ports.end(); ++n)
@@ -128,7 +145,8 @@ size_t InspIRCd::BindPorts(FailedPortList& failed_ports)
 					{
 						protocols.push_back(0); // IPPROTO_TCP
 #ifdef IPPROTO_SCTP
-						protocols.push_back(IPPROTO_SCTP);
+						if (CanCreateSCTPSocket())
+							protocols.push_back(IPPROTO_SCTP);
 #endif
 					}
 					else if (stdalgo::string::equalsci(protocol, "sctp"))
-- 
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