httpd/httpd-2.4.46-freebind.patch

diff --git a/docs/manual/mod/mpm_common.html.en b/docs/manual/mod/mpm_common.html.en
index e7af21d..01d54b7 100644
--- a/docs/manual/mod/mpm_common.html.en
+++ b/docs/manual/mod/mpm_common.html.en
@@ -42,6 +42,7 @@ more than one multi-processing module (MPM)</td></tr>
 <li><img alt="" src="../images/down.gif" /> <a href="#enableexceptionhook">EnableExceptionHook</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#gracefulshutdowntimeout">GracefulShutdownTimeout</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#listen">Listen</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#listenfree">ListenFree</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#listenbacklog">ListenBackLog</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#listencoresbucketsratio">ListenCoresBucketsRatio</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#maxconnectionsperchild">MaxConnectionsPerChild</a></li>
@@ -244,6 +245,31 @@ discussion of the <code>Address already in use</code> error message,
 including other causes.</a></li>
 </ul>
 </div>
+
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="ListenFree" id="ListenFree">ListenFree</a> <a name="listenfree" id="listenfree">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>IP addresses and ports that the server
+listens to. Doesn't require IP address to be up</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ListenFree [<var>IP-address</var>:]<var>portnumber</var> [<var>protocol</var>]</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td><code class="module"><a href="../mod/event.html">event</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code></td></tr>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>This directive is currently available only in Red Hat Enterprise Linux</td></tr>
+</table>
+    <p>The <code class="directive">ListenFree</code> directive is
+    identical to the <code class="directive">Listen</code> directive. 
+    The only difference is in the usage of the IP_FREEBIND socket 
+    option, which is enabled by default with <code class="directive">ListenFree</code>. 
+    If IP_FREEBIND is enabled, it allows httpd to bind to an IP
+    address that is nonlocal or does not (yet) exist. This allows httpd to 
+    listen on a socket without requiring the underlying network interface
+    or the specified dynamic IP address to be up at the time when httpd
+    is trying to bind to it.
+    </p>
+</div>
+
+
 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="directive-section"><h2><a name="ListenBackLog" id="ListenBackLog">ListenBackLog</a> <a name="listenbacklog" id="listenbacklog">Directive</a></h2>
 <table class="directive">
diff --git a/include/ap_listen.h b/include/ap_listen.h
index 58c2574..1a53292 100644
--- a/include/ap_listen.h
+++ b/include/ap_listen.h
@@ -137,6 +137,9 @@ AP_DECLARE_NONSTD(const char *) ap_set_listenbacklog(cmd_parms *cmd, void *dummy
 AP_DECLARE_NONSTD(const char *) ap_set_listencbratio(cmd_parms *cmd, void *dummy, const char *arg);
 AP_DECLARE_NONSTD(const char *) ap_set_listener(cmd_parms *cmd, void *dummy,
                                                 int argc, char *const argv[]);
+AP_DECLARE_NONSTD(const char *) ap_set_freelistener(cmd_parms *cmd, void *dummy,
+                                                    int argc, char *const argv[]);
+
 AP_DECLARE_NONSTD(const char *) ap_set_send_buffer_size(cmd_parms *cmd, void *dummy,
                                                         const char *arg);
 AP_DECLARE_NONSTD(const char *) ap_set_receive_buffer_size(cmd_parms *cmd,
@@ -150,6 +153,8 @@ AP_INIT_TAKE1("ListenCoresBucketsRatio", ap_set_listencbratio, NULL, RSRC_CONF,
   "Ratio between the number of CPU cores (online) and the number of listeners buckets"), \
 AP_INIT_TAKE_ARGV("Listen", ap_set_listener, NULL, RSRC_CONF, \
   "A port number or a numeric IP address and a port number, and an optional protocol"), \
+AP_INIT_TAKE_ARGV("ListenFree", ap_set_freelistener, NULL, RSRC_CONF, \
+  "A port number or a numeric IP address and a port number, and an optional protocol"), \
 AP_INIT_TAKE1("SendBufferSize", ap_set_send_buffer_size, NULL, RSRC_CONF, \
   "Send buffer size in bytes"), \
 AP_INIT_TAKE1("ReceiveBufferSize", ap_set_receive_buffer_size, NULL, \
diff --git a/server/listen.c b/server/listen.c
index e2e028a..6ef664b 100644
--- a/server/listen.c
+++ b/server/listen.c
@@ -63,6 +63,7 @@ static int ap_listenbacklog;
 static int ap_listencbratio;
 static int send_buffer_size;
 static int receive_buffer_size;
+static int ap_listenfreebind;
 #ifdef HAVE_SYSTEMD
 static int use_systemd = -1;
 #endif
@@ -162,6 +163,21 @@ static apr_status_t make_sock(apr_pool_t *p, ap_listen_rec *server, int do_bind_
     }
 #endif
 
+
+#if defined(APR_SO_FREEBIND)
+    if (ap_listenfreebind) {
+        if (apr_socket_opt_set(s, APR_SO_FREEBIND, one) < 0) {
+            stat = apr_get_netos_error();
+            ap_log_perror(APLOG_MARK, APLOG_CRIT, stat, p, APLOGNO(02182)
+                          "make_sock: apr_socket_opt_set: "
+                          "error setting APR_SO_FREEBIND");
+            apr_socket_close(s);
+            return stat;
+       }
+   }
+#endif
+
+
     if (do_bind_listen) {
 #if APR_HAVE_IPV6
         if (server->bind_addr->family == APR_INET6) {
@@ -956,6 +972,7 @@ AP_DECLARE(void) ap_listen_pre_config(void)
     }
 }
 
+
 AP_DECLARE_NONSTD(const char *) ap_set_listener(cmd_parms *cmd, void *dummy,
                                                 int argc, char *const argv[])
 {
@@ -1016,6 +1033,14 @@ AP_DECLARE_NONSTD(const char *) ap_set_listener(cmd_parms *cmd, void *dummy,
     return alloc_listener(cmd->server->process, host, port, proto, NULL);
 }
 
+AP_DECLARE_NONSTD(const char *) ap_set_freelistener(cmd_parms *cmd, void *dummy,
+                                                    int argc,
+                                                    char *const argv[])
+{
+    ap_listenfreebind = 1;
+    return ap_set_listener(cmd, dummy, argc, argv);
+}
+
 AP_DECLARE_NONSTD(const char *) ap_set_listenbacklog(cmd_parms *cmd,
                                                      void *dummy,
                                                      const char *arg)