resolve hostnames

src/client_main.cpp

@@ -3,11 +3,13 @@
 #include "proto.hpp"
 #include "ui.hpp"
 #include "util.hpp"
+#include <arpa/inet.h>
 #include <cstdio>
 #include <cxxopts.hpp>
 #include <future>
 #include <iostream>
 #include <mutex>
+#include <netdb.h>
 #include <sstream>
 #include <stdexcept>
 #include <string>
@@ -204,8 +206,21 @@ int main(int argc, char *argv[]) {
     std::cerr << usage << std::endl;
     return EXIT_FAILURE;
   }
+
+  auto server = result["server"].as<std::string>();
+  auto port = result["port"].as<int>();
+  // resolve dns
+  struct addrinfo *dnsResult, hints;
+  in_addr sin_addr;
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_family = AF_INET;
+  hints.ai_socktype = SOCK_STREAM;
+  getaddrinfo(server.c_str(), std::to_string(port).c_str(), &hints, &dnsResult);
+  sin_addr = ((struct sockaddr_in *)dnsResult->ai_addr)->sin_addr;
+  freeaddrinfo(dnsResult);
+
   // try to connect to server
-  cl = new Client(result["server"].as<std::string>(), result["port"].as<int>());
+  cl = new Client(inet_ntoa(sin_addr), port);
   state.set(CONNECTING);
   cl->onReceive(onReceive);
   auto rc = cl->connectToServer();