[nginx] Set IP_BIND_ADDRESS_NO_PORT socket option for upstream sockets.

[Andrei Belov]

details:   http://hg.nginx.org/nginx/rev/2c7b488a61fb
branches:  
changeset: 6592:2c7b488a61fb
user:      Andrei Belov <defan at nginx.com>
date:      Mon Jun 20 10:41:17 2016 +0300
description:
Set IP_BIND_ADDRESS_NO_PORT socket option for upstream sockets.

diffstat:

 auto/unix                     |  13 +++++++++++++
 src/event/ngx_event_connect.c |  26 ++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 0 deletions(-)

diffs (59 lines):

diff -r 04d8d1f85649 -r 2c7b488a61fb auto/unix
--- a/auto/unix	Wed Jun 15 21:05:30 2016 +0100
+++ b/auto/unix	Mon Jun 20 10:41:17 2016 +0300
@@ -341,6 +341,19 @@ ngx_feature_test="setsockopt(0, SOL_SOCK
 . auto/feature
 
 
+# Linux IP_BIND_ADDRESS_NO_PORT
+
+ngx_feature="IP_BIND_ADDRESS_NO_PORT"
+ngx_feature_name="NGX_HAVE_IP_BIND_ADDRESS_NO_PORT"
+ngx_feature_run=no
+ngx_feature_incs="#include <sys/socket.h>
+                  #include <netinet/in.h>"
+ngx_feature_path=
+ngx_feature_libs=
+ngx_feature_test="setsockopt(0, IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT, NULL, 0)"
+. auto/feature
+
+
 # Linux transparent proxying
 
 ngx_feature="IP_TRANSPARENT"
diff -r 04d8d1f85649 -r 2c7b488a61fb src/event/ngx_event_connect.c
--- a/src/event/ngx_event_connect.c	Wed Jun 15 21:05:30 2016 +0100
+++ b/src/event/ngx_event_connect.c	Mon Jun 20 10:41:17 2016 +0300
@@ -87,6 +87,32 @@ ngx_event_connect_peer(ngx_peer_connecti
         }
 #endif
 
+#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT)
+
+        if (pc->sockaddr->sa_family != AF_UNIX) {
+            static int  bind_address_no_port = 1;
+
+            if (bind_address_no_port) {
+                if (setsockopt(s, IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT,
+                               (const void *) &bind_address_no_port,
+                               sizeof(int)) == -1)
+                {
+                    err = ngx_socket_errno;
+
+                    if (err != NGX_EOPNOTSUPP && err != NGX_ENOPROTOOPT) {
+                        ngx_log_error(NGX_LOG_ALERT, pc->log, err,
+                                      "setsockopt(IP_BIND_ADDRESS_NO_PORT) "
+                                      "failed, ignored");
+
+                    } else {
+                        bind_address_no_port = 0;
+                    }
+                }
+            }
+        }
+
+#endif
+
         if (bind(s, pc->local->sockaddr, pc->local->socklen) == -1) {
             ngx_log_error(NGX_LOG_CRIT, pc->log, ngx_socket_errno,
                           "bind(%V) failed", &pc->local->name);