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#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
enum {
HOST = INADDR_LOOPBACK,
PORT = 6666,
MAX_BUF = 1024
};
struct sock {
int sockfd;
int addrlen;
struct sockaddr_in addr;
} host, client;
int check(int x, char*msg)
{
if (!~x) {
perror(msg);
exit(1);
}
return x;
}
#define QUOTE_(...) #__VA_ARGS__
#define QUOTE(...) QUOTE_(__VA_ARGS__)
#define CHECK(...) check(__VA_ARGS__, QUOTE(line __LINE__: __VA_ARGS__))
int main(int argc, char**argv)
{
struct sock host, client;
host.sockfd = CHECK(socket(AF_INET, SOCK_STREAM, 0)),
host.addr = (struct sockaddr_in){AF_INET, htons(PORT), htonl(HOST)};
CHECK(bind(host.sockfd, &(struct sockaddr)host.addr, sizeof(host.addr)));
CHECK(listen(host.sockfd, 1));
CHECK(client.sockfd = accept(host.sockfd, (void*)&client.addr, &client.addrlen));
printf("connected: %s\n", inet_ntoa(client.addr.sin_addr));
struct {int len; char buf[MAX_BUF];} msg;
while (CHECK(msg.len = recv(client.sockfd, msg.buf, MAX_BUF - 1, 0)) && msg.len) {
msg.buf[msg.len] = 0;
printf("%s", msg.buf);
send(client.sockfd, msg.buf, msg.len, 0);
}
close(client.sockfd);
close(host.sockfd);
return 0;
}
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