From 0b8a13ab51551f4a6a67f7f52a22256d6e15ba90 Mon Sep 17 00:00:00 2001
From: Peter Powell <petpow@saberuk.com>
Date: Sat, 12 Nov 2016 16:04:16 +0000
Subject: Allow listeners to be able to listen on unavailable addresses.

---
 src/listensocket.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src')

diff --git a/src/listensocket.cpp b/src/listensocket.cpp
index 13aebf75f..d09f5e624 100644
--- a/src/listensocket.cpp
+++ b/src/listensocket.cpp
@@ -54,6 +54,20 @@ ListenSocket::ListenSocket(ConfigTag* tag, const irc::sockets::sockaddrs& bind_t
 	}
 #endif
 
+	if (tag->getBool("free"))
+	{
+		socklen_t enable = 1;
+#if defined IP_FREEBIND // Linux 2.4+
+		setsockopt(fd, SOL_IP, IP_FREEBIND, &enable, sizeof(enable));
+#elif defined IP_BINDANY // FreeBSD
+		setsockopt(fd, IPPROTO_IP, IP_BINDANY, &enable, sizeof(enable));
+#elif defined SO_BINDANY // NetBSD/OpenBSD
+		setsockopt(fd, SOL_SOCKET, SO_BINDANY, &enable, sizeof(enable));
+#else
+		(void)enable;
+#endif
+	}
+
 	SocketEngine::SetReuse(fd);
 	int rv = SocketEngine::Bind(this->fd, bind_to);
 	if (rv >= 0)
-- 
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