This path extends existing resolver command to optionally take a second parameter. The second parameter can be used to override default port 53.

-Umesh

diff -rupN tmp/nginx-0.8.53/src/http/ngx_http_core_module.c nginx-0.8.53/src/http/ngx_http_core_module.c
--- tmp/nginx-0.8.53/src/http/ngx_http_core_module.c 2010-10-18 10:14:00.000000000 +0000
+++ nginx-0.8.53/src/http/ngx_http_core_module.c 2011-02-04 19:07:32.000000000 +0000
@@ -679,7 +679,7 @@ static ngx_command_t ngx_http_core_comm
NULL },

{ ngx_string("resolver"),
- NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+ NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1|NGX_CONF_TAKE2,
ngx_http_core_resolver,
NGX_HTTP_LOC_CONF_OFFSET,
0,
@@ -4338,6 +4338,7 @@ ngx_http_core_resolver(ngx_conf_t *cf, n

ngx_url_t u;
ngx_str_t *value;
+ ngx_int_t port;

if (clcf->resolver) {
return "is duplicate";
@@ -4348,7 +4349,16 @@ ngx_http_core_resolver(ngx_conf_t *cf, n
ngx_memzero(&u, sizeof(ngx_url_t));

u.host = value[1];
- u.port = 53;
+ if(cf->args->nelts == 3){
+ port = ngx_atoi(value[2].data, value[2].len);
+ if (port == NGX_ERROR || port == 0) {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid resolver port \"%V\"", &value[2]);
+ return NGX_CONF_ERROR;
+ }
+ u.port = port;
+ }else
+ u.port = 53;

if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V: %s", &u.host, u.err);

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