SonarCloud: fix codesmells

src/lib/ares_dns_name.c

@@ -175,7 +175,7 @@ static ares__buf_t *ares_dns_labels_add(ares_dns_labels_t *labels)
   return labels->label[labels->num - 1];
 }
 
-static ares__buf_t *ares_dns_labels_get_last(ares_dns_labels_t *labels)
+static const ares__buf_t *ares_dns_labels_get_last(const ares_dns_labels_t *labels)
 {
   if (labels == NULL || labels->num == 0) {
     return NULL;
@@ -271,7 +271,7 @@ static ares_status_t ares_split_dns_name(ares_dns_labels_t *labels,
 
   if (*name != '\0') {
     status =
-      ares__buf_append(namebuf, (unsigned char *)name, ares_strlen(name));
+      ares__buf_append(namebuf, (const unsigned char *)name, ares_strlen(name));
     if (status != ARES_SUCCESS) {
       goto done;
     }

src/lib/ares_dns_write.c

@@ -208,7 +208,7 @@ static ares_status_t ares_dns_write_rr_str(ares__buf_t         *buf,
   }
 
   /* Write string */
-  return ares__buf_append(buf, (unsigned char *)str, len);
+  return ares__buf_append(buf, (const unsigned char *)str, len);
 }
 
 static ares_status_t ares_dns_write_rr_binstrs(ares__buf_t         *buf,
@@ -242,7 +242,7 @@ static ares_status_t ares_dns_write_rr_binstrs(ares__buf_t         *buf,
 
     /* String */
     if (len) {
-      status = ares__buf_append(buf, (unsigned char *)ptr, len);
+      status = ares__buf_append(buf, (const unsigned char *)ptr, len);
       if (status != ARES_SUCCESS) {
         return status;
       }
@@ -297,7 +297,7 @@ static ares_status_t ares_dns_write_rr_a(ares__buf_t         *buf,
     return ARES_EFORMERR;
   }
 
-  return ares__buf_append(buf, (unsigned char *)&addr, sizeof(*addr));
+  return ares__buf_append(buf, (const unsigned char *)addr, sizeof(*addr));
 }
 
 static ares_status_t ares_dns_write_rr_ns(ares__buf_t         *buf,
@@ -427,7 +427,7 @@ static ares_status_t ares_dns_write_rr_aaaa(ares__buf_t         *buf,
     return ARES_EFORMERR;
   }
 
-  return ares__buf_append(buf, (unsigned char *)&addr, sizeof(*addr));
+  return ares__buf_append(buf, (const unsigned char *)addr, sizeof(*addr));
 }
 
 static ares_status_t ares_dns_write_rr_srv(ares__buf_t         *buf,
@@ -573,7 +573,8 @@ static ares_status_t ares_dns_write_rr_uri(ares__buf_t         *buf,
     return ARES_EFORMERR;
   }
 
-  return ares__buf_append(buf, (unsigned char *)target, ares_strlen(target));
+  return ares__buf_append(buf, (const unsigned char *)target,
+                          ares_strlen(target));
 }
 
 static ares_status_t ares_dns_write_rr_caa(ares__buf_t         *buf,
@@ -660,7 +661,7 @@ static ares_status_t ares_dns_write_rr(ares_dns_record_t *dnsrec,
   size_t i;
 
   for (i = 0; i < ares_dns_record_rr_cnt(dnsrec, section); i++) {
-    ares_dns_rr_t      *rr;
+    const ares_dns_rr_t *rr;
     ares_dns_rec_type_t  type;
     ares_bool_t          allow_compress;
     ares__llist_t      **namelistptr = NULL;

src/lib/ares_process.c

@@ -568,7 +568,7 @@ static ares_status_t rewrite_without_edns(ares_dns_record_t *qdnsrec,
   /* Find and remove the OPT RR record */
   for (i = 0; i < ares_dns_record_rr_cnt(qdnsrec, ARES_SECTION_ADDITIONAL);
        i++) {
-    ares_dns_rr_t *rr;
+    const ares_dns_rr_t *rr;
     rr = ares_dns_record_rr_get(qdnsrec, ARES_SECTION_ADDITIONAL, i);
     if (ares_dns_rr_get_type(rr) == ARES_REC_TYPE_OPT) {
       ares_dns_record_rr_del(qdnsrec, ARES_SECTION_ADDITIONAL, i);
@@ -786,7 +786,7 @@ static struct server_state *ares__random_server(ares_channel_t *channel)
 }
 
 static ares_status_t ares__append_tcpbuf(struct server_state *server,
-                                         struct query        *query)
+                                         const struct query  *query)
 {
   ares_status_t status;