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 1a6c1d3..d375fee 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)
diff --git a/docs/manual/mod/mpm_common.html.en b/docs/manual/mod/mpm_common.html.en
index 5d688e4..eb66c19 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>
@@ -233,6 +234,31 @@ 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">