tcp-server

/*
 *
 * Compilation:  gcc -Wall ./tcp-server.c -o ./tcp-server
 * Usage:        ./tcp-server
 *
 *
 */

#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
#include <netdb.h>

int main(int argc, char** argv) {
    if (argc != 3) {
        printf("usage: ./tcp-server <IP> <PORT>\n");
        return -1;
    }

  socklen_t sl;
  int sfd, cfd, on = 1;
  struct sockaddr_in saddr, caddr;

  memset(&saddr, 0, sizeof(saddr));
  saddr.sin_family = AF_INET;
  saddr.sin_addr.s_addr = INADDR_ANY;
  saddr.sin_port = htons(1234);
  sfd = socket(PF_INET, SOCK_STREAM, 0);
  setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (char*) &on, sizeof(on));
  bind(sfd, (struct sockaddr*) &saddr, sizeof(saddr));
  listen(sfd, 5);

  unsigned long long int asdf = 0;

  while(1) {

    memset(&caddr, 0, sizeof(caddr));
    sl = sizeof(caddr);
    cfd = accept(sfd, (struct sockaddr*) &caddr, &sl);
    char buff[256] = {0};
    int sz = read(cfd, &buff, 256);
    if (sz <= 0) {
        printf("something went wrong!");
    }

    printf("[got:]\t%s\n", buff);

    int csfd;
    struct sockaddr_in csaddr;
    struct hostent* caddrent;

    caddrent = gethostbyname(argv[1]);
    csfd = socket(PF_INET, SOCK_STREAM, 0);
    memset(&csaddr, 0, sizeof(csaddr));
    csaddr.sin_family = AF_INET;
    csaddr.sin_port = htons(atoi(argv[2]));
    memcpy(&csaddr.sin_addr.s_addr, caddrent->h_addr, caddrent->h_length);
    connect(csfd, (struct sockaddr*) &csaddr, sizeof(csaddr));
    write(csfd, &buff, sz);
    close(csfd);
  }
  close(sfd);
  return EXIT_SUCCESS;
}