# HG changeset patch
# User Ruslan Ermilov <ru@nginx.com>
# Date 1375685759 -14400
# Node ID ec8594b9bf11de3599af15de8e73e41bf7a8b42c
# Parent  ae3fd1ca62e0942a6c83a37f30df386622462c80
Core: only resolve address families configured on the local system.

This is done by passing AI_ADDRCONFIG to getaddrinfo().

On Linux, setting net.ipv6.conf.all.disable_ipv6 to 1 will now be
respected.

On FreeBSD, AI_ADDRCONFIG filtering is currently implemented by
attempting to create a datagram socket for the corresponding family,
which succeeds even if the system doesn't in fact have any addresses
of that family configured.  That is, if the system with IPv6 support
in the kernel doesn't have IPv6 addresses configured, AI_ADDRCONFIG
will filter out IPv6 only inside a jail without IPv6 addresses or
with IPv6 disabled.

diff --git a/auto/unix b/auto/unix
--- a/auto/unix
+++ b/auto/unix
@@ -788,7 +788,11 @@ ngx_feature_incs="#include <sys/types.h>
                   #include <netdb.h>"
 ngx_feature_path=
 ngx_feature_libs=
-ngx_feature_test='struct addrinfo *res;
-                  if (getaddrinfo("localhost", NULL, NULL, &res) != 0) return 1;
+ngx_feature_test='struct addrinfo hints, *res;
+                  hints.ai_family = AF_UNSPEC;
+                  hints.ai_socktype = SOCK_STREAM;
+                  hints.ai_flags = AI_ADDRCONFIG;
+                  if (getaddrinfo("localhost", NULL, &hints, &res) != 0)
+                      return 1;
                   freeaddrinfo(res)'
 . auto/feature
diff --git a/src/core/ngx_inet.c b/src/core/ngx_inet.c
--- a/src/core/ngx_inet.c
+++ b/src/core/ngx_inet.c
@@ -963,6 +963,7 @@ ngx_inet_resolve_host(ngx_pool_t *pool, 
     ngx_memzero(&hints, sizeof(struct addrinfo));
     hints.ai_family = AF_UNSPEC;
     hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_ADDRCONFIG;
 
     if (getaddrinfo((char *) host, NULL, &hints, &res) != 0) {
         u->err = "host not found";