netty_resolver_dns_macos.c — netty Source File

Source Code

/*
 * Copyright 2019 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <dlfcn.h>
#include <sys/socket.h>
#include <stdlib.h>
#include "dnsinfo.h"
#include "netty_unix_jni.h"
#include "netty_unix_util.h"
#include "netty_unix_socket.h"
#include "netty_unix_errors.h"

// Add define if NETTY_BUILD_STATIC is defined so it is picked up in netty_jni_util.c
#ifdef NETTY_BUILD_STATIC
#define NETTY_JNI_UTIL_BUILD_STATIC
#endif

#define STREAM_CLASSNAME "io/netty/resolver/dns/macos/MacOSDnsServerAddressStreamProvider"

static jweak dnsResolverClassWeak = NULL;
static jclass byteArrayClass = NULL;
static jclass stringClass = NULL;
static jmethodID dnsResolverMethodId = NULL;
static char const* staticPackagePrefix = NULL;

// JNI Registered Methods Begin

// We use the same API as mDNSResponder and Chromium to retrieve the current nameserver configuration for the system:
// See:
//     https://src.chromium.org/viewvc/chrome?revision=218617&view=revision
//     https://opensource.apple.com/tarballs/mDNSResponder/
static jobjectArray netty_resolver_dns_macos_resolvers(JNIEnv* env, jclass clazz) {
    jclass dnsResolverClass = NULL;
    dns_config_t* config = dns_configuration_copy();
    if (config == NULL) {
        goto error;
    }
    NETTY_JNI_UTIL_NEW_LOCAL_FROM_WEAK(env, dnsResolverClass, dnsResolverClassWeak, error);

    jobjectArray array = (*env)->NewObjectArray(env, config->n_resolver, dnsResolverClass, NULL);
    if (array == NULL) {
        goto error;
    }

    for (int i = 0; i < config->n_resolver; i++) {
// ... (181 more lines)