Re #1838: Enable application to provide its own external resolver implementation.

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@5055 74dad513-b988-da41-8d7b-12977e46ad98

2 files changed, 36 insertions, 0 deletions

diff --git a/pjsip/src/pjsip/sip_endpoint.c b/pjsip/src/pjsip/sip_endpoint.c
index d1f66b8c..b2094268 100644
--- a/pjsip/src/pjsip/sip_endpoint.c
+++ b/pjsip/src/pjsip/sip_endpoint.c
@@ -1128,6 +1128,15 @@ PJ_DEF(pj_status_t) pjsip_endpt_set_resolver( pjsip_endpoint *endpt,
 }
 
 /*
+ * Set DNS external resolver implementation to be used by the SIP resolver.
+ */
+PJ_DEF(pj_status_t) pjsip_endpt_set_ext_resolver(pjsip_endpoint *endpt,
+						 pjsip_ext_resolver *ext_res)
+{
+    return pjsip_resolver_set_ext_resolver(endpt->resolver, ext_res);
+}
+
+/*
  * Get the DNS resolver being used by the SIP resolver.
  */
 PJ_DEF(pj_dns_resolver*) pjsip_endpt_get_resolver(pjsip_endpoint *endpt)
diff --git a/pjsip/src/pjsip/sip_resolve.c b/pjsip/src/pjsip/sip_resolve.c
index 03413ab8..943fb3c4 100644
--- a/pjsip/src/pjsip/sip_resolve.c
+++ b/pjsip/src/pjsip/sip_resolve.c
@@ -70,6 +70,7 @@ struct query
 struct pjsip_resolver_t
 {
     pj_dns_resolver *res;
+    pjsip_ext_resolver *ext_res;
 };
 
 
@@ -114,6 +115,26 @@ PJ_DEF(pj_status_t) pjsip_resolver_set_resolver(pjsip_resolver_t *res,
 #endif
 }
 
+/*
+ * Public API to set the DNS external resolver implementation for the SIP 
+ * resolver.
+ */
+PJ_DEF(pj_status_t) pjsip_resolver_set_ext_resolver(pjsip_resolver_t *res,
+                                                    pjsip_ext_resolver *ext_res)
+{
+    if (ext_res && !ext_res->resolve)
+	return PJ_EINVAL;
+
+    if (ext_res && res->res) {
+#if PJSIP_HAS_RESOLVER
+	pj_dns_resolver_destroy(res->res, PJ_FALSE);
+#endif
+	res->res = NULL;
+    }
+    res->ext_res = ext_res;
+    return PJ_SUCCESS;
+}
+
 
 /*
  * Public API to get the internal DNS resolver.
@@ -175,6 +196,12 @@ PJ_DEF(void) pjsip_resolve( pjsip_resolver_t *resolver,
     struct query *query;
     pjsip_transport_type_e type = target->type;
 
+    /* If an external implementation has been provided use it instead */
+    if (resolver->ext_res) {
+        (*resolver->ext_res->resolve)(resolver, pool, target, token, cb);
+        return;
+    }
+
     /* Is it IP address or hostname? And if it's an IP, which version? */
     ip_addr_ver = get_ip_addr_ver(&target->addr.host);