clientsocket.cpp

/*
   Copyright 2017 Logu J

   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 <cstdio>
#include <cstring>
#include <netdb.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>
#include "clientsocket.h"

Stream* ClientSocket::connect(const char* server, int port)
{
    struct sockaddr_in address;

    memset (&address, 0, sizeof(address));
    address.sin_family = AF_INET;
    address.sin_port = htons(port);
    if (resolveHostName(server, &(address.sin_addr)) != 0 ) {
        inet_pton(PF_INET, server, &(address.sin_addr));        
    } 

    // Create and connect the socket, bail if we fail in either case
    int sd = socket(AF_INET, SOCK_STREAM, 0);
    if (sd < 0) {
        perror("socket() failed");
        return NULL;
    }
    if (::connect(sd, (struct sockaddr*)&address, sizeof(address)) != 0) {
        perror("connect() failed");
        close(sd);
        return NULL;
    }
    return new Stream(sd, &address);
}

int ClientSocket::resolveHostName(const char* hostname, struct in_addr* addr) 
{
    struct addrinfo *res;
  
    int result = getaddrinfo(hostname, NULL, NULL, &res);
    if (result == 0) {
        memcpy(addr, &((struct sockaddr_in *) res->ai_addr)->sin_addr, sizeof(struct in_addr));
        freeaddrinfo(res);
    }
    return result;
}