48 lines
2.1 KiB
C
48 lines
2.1 KiB
C
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sys/socket.h>
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
void error(char *msg) {
|
||
|
|
//tato funkcia sa vyuziva ked systemove volanie zlyha
|
||
|
|
perror(msg); //vypise spravu o chybe a ukonci program server
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
int main(int argc, char *argv[]) {
|
||
|
|
int sockfd, newsockfd, portno, clilen, n; //pomocne premenne
|
||
|
|
char buffer[256]; //buffer pre ulozenie znakov zo socketu
|
||
|
|
struct sockaddr_in serv_addr; //obsahuje adresu servera
|
||
|
|
struct sockaddr_in cli_addr; //obsahuje adresu klienta
|
||
|
|
if (argc < 2) { //kontrola poctu argumentov
|
||
|
|
fprintf(stderr,"ERROR, no port provided\n");
|
||
|
|
exit(1);
|
||
|
|
} //vytvorenie socketu
|
||
|
|
sockfd = socket(PF_INET, SOCK_STREAM, 0);
|
||
|
|
if (sockfd < 0)
|
||
|
|
error("ERROR opening socket"); //naplnenie struktury sockaddr_in
|
||
|
|
bzero((char *) &serv_addr, sizeof(serv_addr));
|
||
|
|
portno = atoi(argv[1]);
|
||
|
|
serv_addr.sin_family = AF_INET;
|
||
|
|
serv_addr.sin_addr.s_addr = INADDR_ANY;
|
||
|
|
serv_addr.sin_port = htons(portno); //zviazanie socketu sluzbou bind()
|
||
|
|
//printf("%s", hostent->h_name);
|
||
|
|
if (bind(sockfd, (struct sockaddr *) &serv_addr,
|
||
|
|
sizeof(serv_addr)) < 0)
|
||
|
|
error("ERROR on binding");
|
||
|
|
listen(sockfd,5); //vytvorime si front poziadaviek
|
||
|
|
clilen = sizeof(cli_addr); //velkost struktury adresy klienta //akceptovanie spojenia
|
||
|
|
newsockfd = accept(sockfd,(struct sockaddr *) &cli_addr,&clilen);
|
||
|
|
if (newsockfd < 0)
|
||
|
|
error("ERROR on accept");
|
||
|
|
bzero(buffer,256); //spracovanie dat od klientov
|
||
|
|
n = read(newsockfd,buffer,255);
|
||
|
|
if (n < 0)
|
||
|
|
error("ERROR reading from socket");
|
||
|
|
printf("Here is the message: %s\n",buffer);
|
||
|
|
n = write(newsockfd,"I got your message",18);
|
||
|
|
if (n < 0)
|
||
|
|
error("ERROR writing to socket");
|
||
|
|
return 0;
|
||
|
|
}
|