network: added ipv6 dns result priorization option

Signed-off-by: nvima <p.mirwald@outlook.de>
fluent · Jan 14, 2024 · d941fd4 · d941fd4
1 parent 1ca5136
commit d941fd4
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Showing 2 changed files with 21 additions and 1 deletion.
diff --git a/include/fluent-bit/flb_network.h b/include/fluent-bit/flb_network.h
@@ -77,6 +77,9 @@ struct flb_net_setup {
     /* prioritize ipv4 results when trying to establish a connection*/
     int   dns_prefer_ipv4;
 
+    /* prioritize ipv6 results when trying to establish a connection*/
+    int   dns_prefer_ipv6;
+
     /* maximum number of allowed active TCP connections */
     int max_worker_connections;
 };

diff --git a/src/flb_network.c b/src/flb_network.c
@@ -104,6 +104,7 @@ void flb_net_setup_init(struct flb_net_setup *net)
     net->dns_mode = NULL;
     net->dns_resolver = NULL;
     net->dns_prefer_ipv4 = FLB_FALSE;
+    net->dns_prefer_ipv6 = FLB_FALSE;
     net->keepalive = FLB_TRUE;
     net->keepalive_idle_timeout = 30;
     net->keepalive_max_recycle = 0;
@@ -1268,7 +1269,23 @@ flb_sockfd_t flb_net_tcp_connect(const char *host, unsigned long port,
         sorted_res = flb_net_sort_addrinfo_list(res, AF_INET);
 
         if (sorted_res == NULL) {
-            flb_debug("[net] error sorting getaddrinfo results");
+            flb_debug("[net] error sorting ipv4 getaddrinfo results");
+
+            if (use_async_dns) {
+                flb_net_free_translated_addrinfo(res);
+            }
+            else {
+                freeaddrinfo(res);
+            }
+
+            return -1;
+        }
+    }
+    else if (u_conn->net->dns_prefer_ipv6) {
+        sorted_res = flb_net_sort_addrinfo_list(res, AF_INET6);
+
+        if (sorted_res == NULL) {
+            flb_debug("[net] error sorting ipv6 getaddrinfo results");
 
             if (use_async_dns) {
                 flb_net_free_translated_addrinfo(res);