server

//SCHIMBA NUMERE INTRE ELE
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <stdlib.h>

int main(int argc, char* argvs[]) {
  int s,l;
  struct sockaddr_in server, client1, client2;
  s = socket(AF_INET, SOCK_DGRAM, 0);
  //VERIFICARE --------
  int port = atoi(argvs[1]);
  if(port<1024 || port>65535){
        printf("Portul nu convine!\n");
        return 1;
    }
  //VERIFICARE --------

  if (s < 0) {
    printf("Eroare la crearea socketului server\n");
    return 1;
  }

  memset(&server, 0, sizeof(server));
  server.sin_port = htons(port);
  server.sin_family = AF_INET;
  server.sin_addr.s_addr = INADDR_ANY;

  if (bind(s, (struct sockaddr *) &server, sizeof(server)) < 0) {
    printf("Eroare la bind\n");
    return 1;
  }
  l = sizeof(server);
  uint16_t nr1,nr2;

  recvfrom(s, &nr1, sizeof(nr1), MSG_WAITALL, (struct sockaddr *) &client1, &l);
  recvfrom(s, &nr2, sizeof(nr2), MSG_WAITALL, (struct sockaddr *) &client2, &l);

  sendto(s, &nr2, sizeof(nr2), 0, (struct sockaddr *) &client1, sizeof(client1));
  sendto(s, &nr1, sizeof(nr1), 0, (struct sockaddr *) &client2, sizeof(client2));

  close(s);
}