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#include <iostream>
#include <iterator>
#include <fstream>
#include <string>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <cstring>



#define BUFSIZE 1000

using namespace std;

int main(int argc, char *argv[])
{
    std::string text("Ahoj\n"); // Odesilany a prijimany text
    hostent *host;              // Vzdaleny pocitac
    sockaddr_in serverSock;     // Vzdaleny "konec potrubi"
    int mySocket;               // Soket
    int port;                   // Cislo portu
    char buf[BUFSIZE];          // Prijimaci buffer
    int size;                   // Pocet prijatych a odeslanych bytu
    if (argc != 3)
    {
        cerr << "Syntaxe:\n\t" << argv[0]
             << " " << "adresa port" << endl;
        return -1;
    }
    port = atoi(argv[2]);
    // Zjistime info o vzdalenem pocitaci
    if ((host = gethostbyname(argv[1])) == NULL)
    {
        cerr << "Spatna adresa" << endl;
        return -1;
    }
    // Vytvorime soket
    if ((mySocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
    {
        cerr << "Nelze vytvorit soket" << endl;
        return -1;
    }
    // Zaplnime strukturu sockaddr_in
    // 1) Rodina protokolu
    serverSock.sin_family = AF_INET;
    // 2) Cislo portu, ke kteremu se pripojime
    serverSock.sin_port = htons(port);
    // 3) Nastaveni IP adresy, ke ktere se pripojime
    memcpy(&(serverSock.sin_addr), host->h_addr, host->h_length);
    // Pripojeni soketu
    if (connect(mySocket, (sockaddr *)&serverSock, sizeof(serverSock)) == -1)
    {
        cerr << "Nelze navazat spojeni" << endl;
        return -1;
    }
    // Odeslani dat
    if ((size = send(mySocket, text.c_str(), text.size() + 1, 0)) == -1)
    {
        cerr << "Problem s odeslenim dat" << endl;
        return -1;
    }
    cout << "Odeslano " << size << endl;
    // Prijem dat
    text = "";
    while (((size = recv(mySocket, buf, BUFSIZE - 1, 0)) != -1) && (size != 0))
    {
        cout << "Prijato " << size << endl;
        text += buf;
    }
    // Uzavru spojení
    close(mySocket);
    cout << endl << text << endl;
    return 0;
}

#include <iostream>
#include <iterator>
#include <fstream>
#include <string>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <cstring>


#define BUFSIZE 1000

using namespace std;

int main(int argc, char *argv[])
{
   std::string text;             // Prijimany text
   sockaddr_in sockName;         // "Jmeno" portu
   sockaddr_in clientInfo;       // Klient, ktery se pripojil 
   int mainSocket;               // Soket
   int port;                     // Cislo portu
   char buf[BUFSIZE];            // Prijimaci buffer
   int size;                     // Pocet prijatych a odeslanych bytu
   socklen_t addrlen;            // Velikost adresy vzdaleneho pocitace
   int count = 0;                // Pocet pripojeni

   if (argc != 2)
   {
     cerr << "Syntaxe:\n\t" << argv[0]
	  << " " << "port" << endl;
     return -1;
   }
   port = atoi(argv[1]);
   // Vytvorime soket - viz minuly dil
   if ((mainSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
   {
     cerr << "Nelze vytvorit soket" << endl;
     return -1;
   }
   // Zaplnime strukturu sockaddr_in
   // 1) Rodina protokolu
   sockName.sin_family = AF_INET;
   // 2) Cislo portu, na kterem cekame
   sockName.sin_port = htons(port);
   // 3) Nastaveni IP adresy lokalni sitove karty, pres kterou je mozno se
   //    pripojit. Nastavime moznost pripojit se odkudkoliv. 
   sockName.sin_addr.s_addr = INADDR_ANY;
   // priradime soketu jmeno
   if (bind(mainSocket, (sockaddr *)&sockName, sizeof(sockName)) == -1)
   {
     cerr << "Problem s pojmenovanim soketu." << endl;
     return -1;
   }
   // Vytvorime frontu pozadavku na spojeni. 
   // Vytvorime frontu maximalni velikosti 10 pozadavku.
   if (listen(mainSocket, 10) == -1)
   {
     cerr << "Problem s vytvorenim fronty" << endl;
     return -1;
   }
   do
   {
     // Poznacim si velikost struktury clientInfo.
     // Predam to funkci accept. 
     addrlen = sizeof(clientInfo);
     // Vyberu z fronty pozadavek na spojeni.
     // "client" je novy soket spojujici klienta se serverem.
     int client = accept(mainSocket, (sockaddr*)&clientInfo, &addrlen);
     int totalSize = 0;
     if (client == -1)
     {
       cerr << "Problem s prijetim spojeni" << endl;
       return -1;
     }
     // Zjistim IP klienta.
     cout << "Nekdo se pripojil z adresy: " 
	  << inet_ntoa((in_addr)clientInfo.sin_addr) << endl;
     // Prijmu data. Ke komunikaci s klientem pouzivam soket "client"
     text = "";
     // Prijmeme maximalne 6 bytovy pozdrav. 
    while (totalSize != 6)
    //{
       if ((size = recv(client, buf, BUFSIZE - 1, 0)) == -1)
       {
	 cerr << "Problem s prijetim dat." << endl;
	 return -1;
       }
       cout << "Prijato: " << size << endl;
       totalSize += size;
       text += buf;
    }
     cout << text << endl;
     // Odeslu pozdrav
     if ((size = send(client, "Nazdar\n", 8, 0)) == -1)
     {
       cerr << "Problem s odeslenim dat" << endl;
       return -1;
     }
     cout << "Odeslano: " << size << endl;
     // Uzavru spojeni s klientem
    close(client);
   }
   while (++count != 3);
   cout << "Koncim" << endl;
   close(mainSocket);
   return 0;
}