openresty/patches/nginx-1.19.9-safe_resolver_...

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# HG changeset patch
# User Thibault Charbonnier <thibaultcha@fastmail.com>
# Date 1481847421 28800
# Thu Dec 15 16:17:01 2016 -0800
# Node ID 8bf038fe006fd8ae253d6b41fc6cf109a8912d3e
# Parent a3dc657f4e9530623683e6b85bd7492662e4dc47
Resolver: ignore ipv6=off resolver option when no ipv6 support
Makes the resolver directive more robust: we only error out when ipv6
resolution is desired but not supported (ipv6=on).
use case 1: some configurations are sometimes re-used between builds with and
without ipv6 support. This patch avoids the need to remove the "ipv6=off" flag.
use case 2: currently, some tools rely on the --with-ipv6 configure option from
"nginx -V" to determine if ipv6 resolution should be disabled in some cases.
With this option disappearing in Nginx 1.11.5, this patch would allow such tools
to assume "ipv6=off" to be safe regardless of ipv6 support in the current
build.
diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index dade1846..5a3f0aa4 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -426,14 +426,22 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
continue;
}
-#if (NGX_HAVE_INET6)
if (ngx_strncmp(names[i].data, "ipv6=", 5) == 0) {
if (ngx_strcmp(&names[i].data[5], "on") == 0) {
+#if (NGX_HAVE_INET6)
r->ipv6 = 1;
+#else
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "no ipv6 support but \"%V\" in resolver",
+ &names[i]);
+ return NULL;
+#endif
} else if (ngx_strcmp(&names[i].data[5], "off") == 0) {
+#if (NGX_HAVE_INET6)
r->ipv6 = 0;
+#endif
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
@@ -443,7 +451,6 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
continue;
}
-#endif
#if !(NGX_WIN32)
if (ngx_strncmp(names[i].data, "local=", 6) == 0) {