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-rw-r--r--src/listensocket.cpp16
1 files changed, 16 insertions, 0 deletions
diff --git a/src/listensocket.cpp b/src/listensocket.cpp
index 0c6fd3b5c..0bd6cb92b 100644
--- a/src/listensocket.cpp
+++ b/src/listensocket.cpp
@@ -31,6 +31,22 @@ ListenSocket::ListenSocket(ConfigTag* tag, const irc::sockets::sockaddrs& bind_t
if (rv >= 0)
rv = ServerInstance->SE->Listen(this->fd, ServerInstance->Config->MaxConn);
+#ifdef IPV6_V6ONLY
+ /* This OS supports IPv6 sockets that can also listen for IPv4
+ * connections. If our address is "*" or empty, enable both v4 and v6 to
+ * allow for simpler configuration on dual-stack hosts. Otherwise, if it
+ * is "::" or an IPv6 address, disable support so that an IPv4 bind will
+ * work on the port (by us or another application).
+ */
+ if (bind_to.sa.sa_family == AF_INET6)
+ {
+ std::string addr = tag->getString("address");
+ int enable = (addr.empty() || addr == "*") ? 0 : 1;
+ setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &enable, sizeof(enable));
+ // errors ignored intentionally
+ }
+#endif
+
if (rv < 0)
{
int errstore = errno;