Jan Kończak

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====== Basic ======

<code cpp basic.cpp>
#include <iostream>                 //    ____                _                  _        _      __                  __  
#include <sys/socket.h>             //   |  _ \ ___  __ _  __| |  ___  ___   ___| | _____| |_   / / __ ___  _____   _\ \. 
#include <netinet/in.h>             //   | |_) / _ \/ _` |/ _` | / __|/ _ \ / __| |/ / _ \ __| | | '__/ _ \/ __\ \ / /| |
#include <arpa/inet.h>              //   |  _ <  __/ (_| | (_| | \__ \ (_) | (__|   <  __/ |_  | | | |  __/ (__ \ V / | |
#include <unistd.h>                 //   |_| \_\___|\__,_|\__,_| |___/\___/ \___|_|\_\___|\__| | |_|  \___|\___| \_/  | |
                                    //                                                          \_\                  /_/ 
int main(int argc, char **argv) {
	
	int fd = socket(PF_INET, SOCK_STREAM, 0);
	
	sockaddr_in address { .sin_family = AF_INET,
	                      .sin_port = htons(13),
	                      .sin_addr = {.s_addr = inet_addr("127.0.0.1") }
	                    };
	
	connect(fd, (sockaddr*) &address, sizeof(address));
	
	char buffer[255];
	
	ssize_t readSize = recv(fd, buffer, 254, 0);
	
	buffer[readSize] = 0;
	
	close(fd);
	
	std::cout << buffer << std::endl;
	
	return 0;
}
</code>

====== Klient TCP ======
<code cpp tcp_client.cpp>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>
#include <netdb.h>

int main(int argc, char ** argv){
	if(argc!=3) error(1,0,"Need 2 args");
	
	addrinfo *ao;
	int res = getaddrinfo(argv[1],argv[2],nullptr, &ao);
	if(res || !ao) error(1,errno, "getaddrinfo");
	
	int sock = socket(ao->ai_family, SOCK_STREAM, 0);
	if(sock<0) error(1,errno, "socket");
	
	res = connect(sock, ao->ai_addr, ao->ai_addrlen);
	if(res) error(1,errno, "connect");
	freeaddrinfo(ao);

// ...

	return 0;
}
</code>
Jan Kończak

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