client.c

#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<stdlib.h>


int main(int argc , char *argv[])
{
    int sock;
    struct sockaddr_in server;
    char message[1000] , server_reply[2000];
    char *port =malloc(sizeof(char) *16);

    //Create socket
    sock = socket(AF_INET , SOCK_STREAM , 0);
    if (sock == -1)
    {
        printf("Nie mogę utworzyć socketa");
    }
    puts("Socket utworzony");
    if(argv[1] != NULL && argv[2] !=NULL){
      port = strcpy(port,argv[2]);
      int result_port = atoi(port);
      printf("%d", result_port);
      server.sin_addr.s_addr = inet_addr(argv[1]);
      server.sin_family = AF_INET;
      server.sin_port = htons( result_port );
      printf("Server IP: %s Port: %s\n", argv[1], argv[2]);
    }else if(argv[2] ==NULL){
      server.sin_addr.s_addr = inet_addr(argv[1]);
      server.sin_family = AF_INET;
      server.sin_port = htons( 8888 );
      printf("Server IP: %s Port 8888\n", argv[1]);
    }else{
      server.sin_addr.s_addr = inet_addr("127.0.0.1");
      server.sin_family = AF_INET;
      server.sin_port = htons( 8888 );
      printf("Server IP: 127.0.0.1 Port:8888\n");
    }


    //Connect to remote server
    if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)
    {
        perror("conn. failed. Error");
        return 1;
    }

    puts("Połączony\n");

    //keep communicating with server
    while(1)
    {
        //recive data
        if( recv(sock , server_reply , 2000 , 0) < 0)
        {
            puts("recv failed");
            break;
        }
        if (strcmp(server_reply, "quit")==0){
          close(sock);
          exit(0);
        }
        puts("Serwer :");
        puts(server_reply);
        memset(server_reply, 0, sizeof(server_reply));
        printf("napisz wiadomość(help): ");
        scanf("%s" , message);

        //Send some data
        if( send(sock , message , strlen(message)+1 , 0) < 0)
        {
            puts("Send failed");
            return 1;
        }
        fflush(stdout);
    }

    close(sock);
    free(port);
    return 0;
}