corex: process values for dns_cache params in mod init

- ensure the dns cache structure is properly initialized

src/modules/corex/corex_mod.c

@@ -31,6 +31,7 @@
 #include "../../core/pvar.h"
 #include "../../core/fmsg.h"
 #include "../../core/kemi.h"
+#include "../../core/str_list.h"
 #include "../../core/events.h"
 #include "../../core/onsend.h"
 #include "../../core/dns_cache.h"
@@ -83,6 +84,10 @@ static int  mod_init(void);
 static int  child_init(int);
 static void mod_destroy(void);
 
+static str_list_t *corex_dns_cache_list = NULL;
+
+static int corex_dns_cache_param_add(str *pval);
+
 static int corex_sip_reply_out(sr_event_param_t *evp);
 
 static pv_export_t mod_pvs[] = {
@@ -186,6 +191,8 @@ struct module_exports exports = {
  */
 static int mod_init(void)
 {
+	str_list_t *sit;
+
 	if(corex_init_rpc()<0)
 	{
 		LM_ERR("failed to register RPC commands\n");
@@ -204,6 +211,13 @@ static int mod_init(void)
 		return -1;
 	}
 
+	for(sit = corex_dns_cache_list; sit!=NULL; sit=sit->next) {
+		if(corex_dns_cache_param_add(&sit->s)<0) {
+			LM_ERR("failed to add record: %.*s\n", sit->s.len, sit->s.s);
+			return -1;
+		}
+	}
+
 	if((nio_intercept > 0) && (nio_intercept_init() < 0))
 	{
 		LM_ERR("failed to register network io intercept callback\n");
@@ -336,6 +350,29 @@ error:
 }
 
 int corex_dns_cache_param(modparam_t type, void *val)
+{
+	str_list_t *sit;
+
+	if(val==NULL || ((str*)val)->s==NULL || ((str*)val)->len==0) {
+		LM_ERR("invalid parameter\n");
+		return -1;
+	}
+
+	sit = (str_list_t*)pkg_mallocxz(sizeof(str_list_t));
+	if(sit==NULL) {
+		PKG_MEM_ERROR;
+		return -1;
+	}
+	sit->s = *((str*)val);
+	if(corex_dns_cache_list!=NULL) {
+		sit->next = corex_dns_cache_list;
+	}
+	corex_dns_cache_list = sit;
+
+	return 0;
+}
+
+static int corex_dns_cache_param_add(str *pval)
 {
 	str sval;
 	param_t* params_list = NULL;
@@ -347,11 +384,11 @@ int corex_dns_cache_param(modparam_t type, void *val)
 	int dns_ttl = 0;
 	int dns_flags = 0;
 
-	if(val==NULL) {
+	if(pval==NULL) {
 		LM_ERR("invalid parameter\n");
 		goto error;
 	}
-	sval = *((str*)val);
+	sval = *pval;
 	if(sval.s==NULL || sval.len<=0) {
 		LM_ERR("invalid parameter value\n");
 		goto error;