From b57dfac8a047494162395422447ed5675806cfdc Mon Sep 17 00:00:00 2001
From: Jakub Hrozek <jhrozek@redhat.com>
Date: May 03 2018 19:52:15 +0000
Subject: DYNDNS: Retry also on timeouts


There is the dyndns_server option that is supposed to make it possible
for the admin to select a server to update DNS with if the server
detected by nsupdate does not work. The fallback works OK for the case
where nsupdate fails with a non-zero return code, but doesn't work
for the case where nsupdate times out.

This patch extends the retry condition to also fallback to the
dyndns_server directive if nsupdate return ERR_DYNDNS_TIMEOUT.

Resolves:
https://pagure.io/SSSD/sssd/issue/3725

Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>

---

diff --git a/src/providers/ldap/sdap_dyndns.c b/src/providers/ldap/sdap_dyndns.c
index f791ba9..20d97ca 100644
--- a/src/providers/ldap/sdap_dyndns.c
+++ b/src/providers/ldap/sdap_dyndns.c
@@ -79,10 +79,10 @@ static struct sss_iface_addr*
 sdap_get_address_to_delete(struct sss_iface_addr *address_it,
                            uint8_t remove_af);
 
-static bool should_retry(int child_status)
+static bool should_retry(int nsupdate_ret, int child_status)
 {
-    if (WIFEXITED(child_status)
-            && WEXITSTATUS(child_status) != 0) {
+    if ((WIFEXITED(child_status) && WEXITSTATUS(child_status) != 0)
+         || nsupdate_ret == ERR_DYNDNS_TIMEOUT) {
         return true;
     }
 
@@ -381,7 +381,7 @@ sdap_dyndns_update_done(struct tevent_req *subreq)
     if (ret != EOK) {
         /* If the update didn't succeed, we can retry using the server name */
         if (state->fallback_mode == false
-                && should_retry(child_status)) {
+                && should_retry(ret, child_status)) {
             state->fallback_mode = true;
             DEBUG(SSSDBG_MINOR_FAILURE,
                   "nsupdate failed, retrying.\n");
@@ -523,7 +523,7 @@ sdap_dyndns_update_ptr_done(struct tevent_req *subreq)
     if (ret != EOK) {
         /* If the update didn't succeed, we can retry using the server name */
         if (state->fallback_mode == false
-                && should_retry(child_status)) {
+                && should_retry(ret, child_status)) {
             state->fallback_mode = true;
             DEBUG(SSSDBG_MINOR_FAILURE, "nsupdate failed, retrying\n");
             ret = sdap_dyndns_update_ptr_step(req);