BSD Socket example for Objective-C

bsd_socket_example.m

+ (void) createSocket {
    int sockfd;
    
    if ( (sockfd = socket( AF_INET, SOCK_STREAM, 0 )) < 0 ) {
        NSLog(@"Error creaing socket");
        return;
    }
    struct sockaddr_in sockaddr;
    sockaddr.sin_family = AF_INET;
    sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    
    bind(sockfd, (struct sockaddr *) &sockaddr, sizeof(sockaddr));

    struct sockaddr_in serverAddress;
    bzero( &serverAddress, sizeof(serverAddress) );
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_port = htons(80);
    
    struct hostent *hp;
    hp = gethostbyname("naver.com");
    if(hp == 0) {
        NSLog(@"error getting host address");
    }
    memcpy(&serverAddress.sin_addr, hp->h_addr, hp->h_length);
    
    if ( connect( sockfd, (struct sockaddr *)&serverAddress, sizeof(serverAddress)) < 0 )
    {
        NSLog(@"connect error");
        return;
    }
    
    char buffer[100];
    sprintf(buffer,"GET / HTTP/1.0\r\n\r\n");
    write(sockfd, buffer, strlen(buffer));
    read(sockfd, buffer, 100);
    NSLog(@"%s",buffer);
    
    return
}