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client.c
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client.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
void error(const char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
FILE*fileName;
char *source;
int sockfd, portno,tmp,n;//Εκχώριση μεταβλητών
int q=0;
struct sockaddr_in serv_addr;//struct για server address
struct hostent *server;//host address
char buffer[256];
if (argc < 3)
{
fprintf(stderr, "usage %s hostname port\n", argv[0]);//error αν το host address ειναι λαθος
exit(0);
}
portno = atoi(argv[2]);//όρισμα ως port το δεύτεροόρισμα που δίνει ο χρήστης
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0){
printf("ERROR opening socket\n");
exit(1);
}
printf("Client Socket is created.\n");
server = gethostbyname(argv[1]);//Host address το πρώτο όρισμα που δίνει ο χρήστης
if (server == NULL)
{
fprintf(stderr, "ERROR, no such host\n");//Error αν το host ειναι λάθος
exit(0);
}
//lab11_5_client
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(portno);
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
tmp = connect(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if(tmp < 0){
printf("Error in connection.\n");//Error στη σύνδεση
exit(1);
}
printf("Connected to Server.\n");//Σύνδεση στον Server
while(1){
printf("%s_>",argv[1]);//Εμφάνιση hostaddres για την είσοδο μηνυμάτων
bzero(buffer, 256);//Καθαρισμός buffer
fgets(buffer, 256, stdin);//Eίσοδος από τον χρήστη
n = write(sockfd, buffer,
256);//read από sockfd
if(strstr(buffer,"history")){
FILE *file = fopen("history.txt", "r");
char s;
while((s=fgetc(file))!=EOF) {
printf("%c",s);
}
fclose(file);
}
FILE *file = fopen("history.txt", "a");
fprintf(file, "\n%s",buffer);
fclose(file);
if (n < 0)
error("ERROR writing to socket");
if (strncmp("EXIT", buffer, 4) == 0) {//Αν ο χρήστης δώσει την λέξη EXIT ο client αποσυνδέεται από τον server
fclose(fopen("history.txt", "w"));
close(sockfd);
printf("Disconnected from server.\n");
exit(1);
}
bzero(buffer, 256);
n=read(sockfd, buffer,256);
if (n>0){
printf("%s\n", buffer);
bzero(buffer, 256);
if(n==256){
while(n == 256){ //Αν γεμίσει ο buffer συνεχίχει μέχρι να εκτυπώσει όλα τα αποτελέσματα.
n=read(sockfd, buffer, 256);
printf("%s", buffer);
bzero(buffer, 256);
}
}
}else{
if (n < 0) error("ERROR reading from socket");
if (n==0) error("Server is closed");
}
}
return 0;
}