From a9a8fbbc4ab81d8cd8516ea7496a494d7c46ddb3 Mon Sep 17 00:00:00 2001
From: SPRESENSE <41312067+SPRESENSE@users.noreply.github.com>
Date: Thu, 14 Sep 2023 10:16:49 +0900
Subject: [PATCH] lte/alt1250: Fix bug that name resolution failed for a long
 time

Fix bug that name resolution failed for a long time under particular cases.
If a DNS query for IPv6 succeeds and IPv4 fails, only the answer of the
IPv6 query is saved in the cache. If only IPv4 is given from LTE,
name resolution will fail while the answer is saved in the cache.
Therefore, the ALT1250 daemon sets the given IP type to the DNS client,
which can only send DNS queries for that IP type.
---
 lte/alt1250/callback_handlers/alt1250_evt.c | 25 +++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/lte/alt1250/callback_handlers/alt1250_evt.c b/lte/alt1250/callback_handlers/alt1250_evt.c
index 19cf674b1..a2ab7782a 100644
--- a/lte/alt1250/callback_handlers/alt1250_evt.c
+++ b/lte/alt1250/callback_handlers/alt1250_evt.c
@@ -1238,6 +1238,31 @@ static uint64_t lte_set_report_netinfo_exec_cb(FAR void *cb,
         sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
       dns_add_nameserver((FAR const struct sockaddr *)&dnsaddr[i], addrlen);
     }
+
+  if (info->pdn_num > 0)
+    {
+      FAR lte_pdn_t *pdn = &info->pdn_stat[0];
+      FAR lte_ipaddr_t *ipaddr = &pdn->address[0];
+
+      /* ALT1250 can only connect one PDN, so check the first PDN. */
+
+      if ((pdn->ipaddr_num == 1) && (ipaddr->ip_type == LTE_IPTYPE_V4))
+        {
+          dns_set_queryfamily(AF_INET);
+        }
+      else if ((pdn->ipaddr_num == 1) && (ipaddr->ip_type == LTE_IPTYPE_V6))
+        {
+          dns_set_queryfamily(AF_INET6);
+        }
+      else
+        {
+          dns_set_queryfamily(AF_UNSPEC);
+        }
+    }
+  else
+    {
+      dns_set_queryfamily(AF_UNSPEC);
+    }
 #endif
 
   if (callback)