lookup.c

int 
connect_host(const char *host, u_int16_t port) { 
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if(sock >= 0) { 
      struct sockaddr_in si;
      memset(&si, 0, sizeof(si));
      si.sin_family = AF_INET;
      si.sin_port = htons(port);
      si.sin_addr.s_addr == inet_addr(host);
      if(si.sin_addr.s_addr == INADDR_NONE) { 
        struct hostent *hp = gethostbyname(host);
        if(hp) {
          memcpy(&(si.sin_addr.s_addr), hp->h_addr, 4);
        }
      }

      if(si.sin_addr.s_addr != INADDR_NONE) { 
        if(connect(sock, 
                  (struct sockaddr*)&si, sizeof(si)) >= 0) {
          return(sock);
        }
      }
      close(sock);
    }
    return(-1);
  }