android10/system/extras/multinetwork/dnschk.cpp

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed 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
 *
 *      http://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 <arpa/inet.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>

#include <iostream>
#include <string>

#include <android/multinetwork.h>
#include "common.h"


int main(int argc, const char* argv[]) {
    int rval = -1;

    struct Arguments args;
    if (!args.parseArguments(argc, argv)) { return rval; }

    const struct addrinfo hints = {
            .ai_family = args.family,
            .ai_socktype = SOCK_DGRAM,
    };
    struct addrinfo *result = nullptr;

    std::cout << "# " << args.arg1
              << " (via nethandle " << args.nethandle << "):"
              << std::endl;

    switch (args.api_mode) {
        case ApiMode::EXPLICIT:
            rval = android_getaddrinfofornetwork(args.nethandle,
                    args.arg1, nullptr, &hints, &result);
            break;
        case ApiMode::PROCESS:
            if (args.nethandle != NETWORK_UNSPECIFIED) {
                rval = android_setprocnetwork(args.nethandle);
                if (rval != 0) {
                    std::cerr << "android_setprocnetwork returned " << rval
                              << std::endl;
                    return rval;
                }
            }
            rval = getaddrinfo(args.arg1, nullptr, &hints, &result);
            break;
        default:
            // Unreachable.
            std::cerr << "Unknown api mode." << std::endl;
            return -1;
    }

    if (rval != 0) {
        std::cerr << "DNS resolution failure; gaierror=" << rval
                  << " [" << gai_strerror(rval) << "]"
                  << std::endl;
        return rval;
    }

    for (struct addrinfo* rp = result; rp != nullptr; rp = rp->ai_next) {
        std::cout << inetSockaddrToString(rp->ai_addr) << std::endl;
    }

    freeaddrinfo(result);
    return 0;
}