From 495634795203bf4b1b4c7b6ffbc09c071cfbd7a2 Mon Sep 17 00:00:00 2001
From: Wires77 <Wires77@users.noreply.github.com>
Date: Thu, 27 Feb 2025 15:40:35 -0600
Subject: [PATCH] Add option for SO_EXCLUSIVEADDRUSE

---
 src/options.c | 20 ++++++++++++++++++++
 src/options.h |  5 +++++
 src/tcp.c     |  6 ++++++
 src/udp.c     |  6 ++++++
 4 files changed, 37 insertions(+)

diff --git a/src/options.c b/src/options.c
index 9dea6bd..1c3eb1c 100644
--- a/src/options.c
+++ b/src/options.c
@@ -93,6 +93,26 @@ int opt_get_reuseaddr(lua_State *L, p_socket ps)
     return opt_getboolean(L, ps, SOL_SOCKET, SO_REUSEADDR);
 }
 
+/*------------------------------------------------------*/
+/* enables reuse of local address */
+int opt_set_exclusiveaddruse(lua_State* L, p_socket ps)
+{
+#ifndef SO_EXCLUSIVEADDRUSE
+    return luaL_error(L, "SO_EXCLUSIVEADDRUSE is not supported on this operating system");
+#else
+    return opt_setboolean(L, ps, SOL_SOCKET, SO_EXCLUSIVEADDRUSE);
+#endif
+}
+
+int opt_get_exclusiveaddruse(lua_State* L, p_socket ps)
+{
+#ifndef SO_EXCLUSIVEADDRUSE
+    return luaL_error(L, "SO_EXCLUSIVEADDRUSE is not supported on this operating system");
+#else
+    return opt_getboolean(L, ps, SOL_SOCKET, SO_EXCLUSIVEADDRUSE);
+#endif
+}
+
 /*------------------------------------------------------*/
 /* enables reuse of local port */
 int opt_set_reuseport(lua_State *L, p_socket ps)
diff --git a/src/options.h b/src/options.h
index 26d6f02..6d6d7e0 100644
--- a/src/options.h
+++ b/src/options.h
@@ -28,6 +28,11 @@ int opt_meth_getoption(lua_State *L, p_opt opt, p_socket ps);
 int opt_set_reuseaddr(lua_State *L, p_socket ps);
 int opt_get_reuseaddr(lua_State *L, p_socket ps);
 
+#ifdef SO_EXCLUSIVEADDRUSE
+int opt_set_exclusiveaddruse(lua_State* L, p_socket ps);
+int opt_get_exclusiveaddruse(lua_State* L, p_socket ps);
+#endif
+
 int opt_set_reuseport(lua_State *L, p_socket ps);
 int opt_get_reuseport(lua_State *L, p_socket ps);
 
diff --git a/src/tcp.c b/src/tcp.c
index f001206..0a36cde 100644
--- a/src/tcp.c
+++ b/src/tcp.c
@@ -74,6 +74,9 @@ static t_opt optget[] = {
     {"bindtodevice", opt_get_bindtodevice},
     {"keepalive",   opt_get_keepalive},
     {"reuseaddr",   opt_get_reuseaddr},
+#ifdef SO_EXCLUSIVEADDRUSE
+    {"exclusiveaddruse", opt_get_exclusiveaddruse},
+#endif
     {"reuseport",   opt_get_reuseport},
     {"tcp-nodelay", opt_get_tcp_nodelay},
 #ifdef TCP_KEEPIDLE
@@ -96,6 +99,9 @@ static t_opt optset[] = {
     {"bindtodevice", opt_set_bindtodevice},
     {"keepalive",   opt_set_keepalive},
     {"reuseaddr",   opt_set_reuseaddr},
+#ifdef SO_EXCLUSIVEADDRUSE
+    {"exclusiveaddruse", opt_set_exclusiveaddruse},
+#endif
     {"reuseport",   opt_set_reuseport},
     {"tcp-nodelay", opt_set_tcp_nodelay},
 #ifdef TCP_KEEPIDLE
diff --git a/src/udp.c b/src/udp.c
index 712ad50..6c0d39e 100644
--- a/src/udp.c
+++ b/src/udp.c
@@ -74,6 +74,9 @@ static t_opt optset[] = {
     {"dontroute",            opt_set_dontroute},
     {"broadcast",            opt_set_broadcast},
     {"reuseaddr",            opt_set_reuseaddr},
+#ifdef SO_EXCLUSIVEADDRUSE
+    {"exclusiveaddruse", opt_set_exclusiveaddruse},
+#endif
     {"reuseport",            opt_set_reuseport},
     {"ip-multicast-if",      opt_set_ip_multicast_if},
     {"ip-multicast-ttl",     opt_set_ip_multicast_ttl},
@@ -96,6 +99,9 @@ static t_opt optget[] = {
     {"dontroute",            opt_get_dontroute},
     {"broadcast",            opt_get_broadcast},
     {"reuseaddr",            opt_get_reuseaddr},
+#ifdef SO_EXCLUSIVEADDRUSE
+    {"exclusiveaddruse", opt_get_exclusiveaddruse},
+#endif
     {"reuseport",            opt_get_reuseport},
     {"ip-multicast-if",      opt_get_ip_multicast_if},
     {"ip-multicast-loop",    opt_get_ip_multicast_loop},