Fix: only update self domain if not in domain list

Dockerfile

@@ -9,6 +9,9 @@ RUN apk add --no-cache \
     curl-dev \
     curl-static \
     cjson-dev \
+    cjson-static \
+    zstd-dev \
+    zstd-static \
     openssl-dev \
     openssl-libs-static \
     nghttp2-dev \
@@ -34,6 +37,7 @@ RUN make STATIC=1
 FROM scratch
 
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=builder /etc/ssl/cert.pem /etc/ssl/cert.pem
 COPY --from=builder /build/build/dns-keeper /dns-keeper
 
 ENTRYPOINT ["/dns-keeper"]

README.md

@@ -11,7 +11,7 @@ Every `POLL_INTERVAL` seconds, DNS Keeper will check if the IPv4 in the domain(s
 valid by seeing if `DNS_KEEPER_RECORD`.`DNS_KEEPER_DOMAIN` still points to itself.
 
 > [!NOTE]
-> On startup DNS Keeper starts a detached thread with a UDP socket on which it answers with
+> On startup DNS Keeper starts a detached thread with a UDP socket on which it answers
 > a random set of challenge bytes.  
 > DNS Keeper will send an empty data-frame to its own socket using
 > the DNS resolved IPv4 address to see if it gets a response with the correct challenge bytes.  

src/main.c

@@ -108,8 +108,10 @@ int main(void) {
         }
 
         int failed_updates = 0;
+        int self_domain_in_list = 0;
         for (int i = 0; i < cfg.domain_count; i++) {
-            if (strcmp(cfg.domains[i], cfg.dns_keeper_domain) == 0) continue;
+            if (strcmp(cfg.domains[i], cfg.dns_keeper_domain) == 0)
+                self_domain_in_list = 1;
 
             int gret = gandi_update_domains(cfg.domains[i], cached_ip, public_ip);
             if (gret == -3) {
@@ -120,15 +122,19 @@ int main(void) {
             }
         }
 
+        if (!self_domain_in_list) {
             int sret = gandi_update_record(cfg.dns_keeper_domain, cfg.dns_keeper_record,
                                            cached_ip, public_ip);
-        if (sret == 0) {
-            strncpy(cached_ip, public_ip, GANDI_MAX_IP_LEN - 1);
-            cached_ip[GANDI_MAX_IP_LEN - 1] = '\0';
-        } else {
+            if (sret != 0) {
                 log_error("Failed to update self record, cached IP not advanced");
                 failed_updates = 1;
             }
+        }
+
+        if (!failed_updates) {
+            strncpy(cached_ip, public_ip, GANDI_MAX_IP_LEN - 1);
+            cached_ip[GANDI_MAX_IP_LEN - 1] = '\0';
+        }
 
         if (failed_updates) log_error("One or more updates failed this cycle");