nghttpx: Use ImmutableString for ciphers

src/shrpx_config.cc

@@ -1804,7 +1804,7 @@ int parse_config(const char *opt, const char *optarg,
     return 0;
   }
   case SHRPX_OPTID_CIPHERS:
-    mod_config()->tls.ciphers = strcopy(optarg);
+    mod_config()->tls.ciphers = optarg;
 
     return 0;
   case SHRPX_OPTID_CLIENT:

src/shrpx_config.h

@@ -430,7 +430,7 @@ struct TLSConfig {
   ImmutableString private_key_passwd;
   ImmutableString cert_file;
   ImmutableString dh_param_file;
-  std::unique_ptr<char[]> ciphers;
+  ImmutableString ciphers;
   ImmutableString cacert;
   bool insecure;
   bool no_http2_cipher_black_list;

src/shrpx_ssl.cc

@@ -493,8 +493,8 @@ SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file
   SSL_CTX_set_timeout(ssl_ctx, tlsconf.session_timeout.count());
 
   const char *ciphers;
-  if (tlsconf.ciphers) {
-    ciphers = tlsconf.ciphers.get();
+  if (!tlsconf.ciphers.empty()) {
+    ciphers = tlsconf.ciphers.c_str();
   } else {
     ciphers = nghttp2::ssl::DEFAULT_CIPHER_LIST;
   }
@@ -683,8 +683,8 @@ SSL_CTX *create_ssl_client_context(
   SSL_CTX_set_options(ssl_ctx, ssl_opts | tlsconf.tls_proto_mask);
 
   const char *ciphers;
-  if (tlsconf.ciphers) {
-    ciphers = tlsconf.ciphers.get();
+  if (!tlsconf.ciphers.empty()) {
+    ciphers = tlsconf.ciphers.c_str();
   } else {
     ciphers = nghttp2::ssl::DEFAULT_CIPHER_LIST;
   }