diff options
| -rw-r--r-- | src/listensocket.cpp | 16 |
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; |