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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 
     18 #include <arpa/inet.h>
     19 #include <errno.h>
     20 #include <netdb.h>
     21 #include <netinet/in.h>
     22 #include <string.h>
     23 #include <sys/socket.h>
     24 
     25 #include <iostream>
     26 #include <string>
     27 
     28 #include <android/multinetwork.h>
     29 #include "common.h"
     30 
     31 
     32 int main(int argc, const char* argv[]) {
     33     int rval = -1;
     34 
     35     struct Arguments args;
     36     if (!args.parseArguments(argc, argv)) { return rval; }
     37 
     38     const struct addrinfo hints = {
     39             .ai_family = args.family,
     40             .ai_socktype = SOCK_DGRAM,
     41     };
     42     struct addrinfo *result = nullptr;
     43 
     44     std::cout << "# " << args.arg1
     45               << " (via nethandle " << args.nethandle << "):"
     46               << std::endl;
     47 
     48     switch (args.api_mode) {
     49         case ApiMode::EXPLICIT:
     50             rval = android_getaddrinfofornetwork(args.nethandle,
     51                     args.arg1, nullptr, &hints, &result);
     52             break;
     53         case ApiMode::PROCESS:
     54             if (args.nethandle != NETWORK_UNSPECIFIED) {
     55                 rval = android_setprocnetwork(args.nethandle);
     56                 if (rval != 0) {
     57                     std::cerr << "android_setprocnetwork returned " << rval
     58                               << std::endl;
     59                     return rval;
     60                 }
     61             }
     62             rval = getaddrinfo(args.arg1, nullptr, &hints, &result);
     63             break;
     64         default:
     65             // Unreachable.
     66             std::cerr << "Unknown api mode." << std::endl;
     67             return -1;
     68     }
     69 
     70     if (rval != 0) {
     71         std::cerr << "DNS resolution failure; gaierror=" << rval
     72                   << " [" << gai_strerror(rval) << "]"
     73                   << std::endl;
     74         return rval;
     75     }
     76 
     77     for (struct addrinfo* rp = result; rp != nullptr; rp = rp->ai_next) {
     78         std::cout << inetSockaddrToString(rp->ai_addr) << std::endl;
     79     }
     80 
     81     freeaddrinfo(result);
     82     return 0;
     83 }
     84