Hello, I'm implementing Game 21 (BlackJack) in C ++ in a Linux environment, in the course of execution it presents the error Segmentation fault, the problem is that I can not identify the generator of the error. The same one appears after the first loop of the while happens. I am running the code with 'netcat', it is replacing my client. It sends the data to the server for the first time and receives what the server sent and then displays the Segmentation fault. By the way, I'm using socket.
#include <sstream>
#include <cstdlib>
#include <string>
#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h> // socket
#include <arpa/inet.h> // inet_addr
#include <unistd.h> // write
using namespace std;
int client_sock;
struct sockaddr_in server, client;
int socket_desc, c, read_size;
char client_message[1000];
int PORTA = 4000;
int totalj = 0;
void imprime(int sock, string m);
void processarCliente();
int criar_socket_server();
int randomInteger(int low, int high);
void limpa_Buffer();
void faz_Chamada(char variavel);
void processarPC();
/*
*
*/
int main() {
int ok = 1;
//imprime(0, "this is a test!!!");
criar_socket_server();
do {
processarCliente();
} while (ok);
return 0;
}
void imprime(int sock, string m) {
write(sock, m.c_str(), m.size()); //write n aceita string, logo tranformei em vetor de char
}
int criar_socket_server() {
//Create socket
socket_desc = socket(AF_INET, SOCK_STREAM, 0);
if (socket_desc == -1) {
cout << "Could not create socket\n";
}
cout << "Socket created\n";
//Prepare the sockaddr_in structure
server.sin_family = AF_INET; // IPv4
server.sin_addr.s_addr = INADDR_ANY; // qualquer endereco
server.sin_port = htons(PORTA); // porta a esperar por conexoes
//Bind
while (bind(socket_desc, (struct sockaddr *) &server, sizeof (server)) < 0) {//socket esc -> sockfd//server->local
//print the error message
PORTA++;
cout << "Mundando para a porta " << PORTA << "\n";
server.sin_port = htons(PORTA); // porta a esperar por conexoes
}
cout << "bind done\n";
//Listen
listen(socket_desc, 3);
}
void processarCliente() {
int jogada = 0;
totalj = 0;
char temp;
//Accept and incoming connection
c = sizeof (struct sockaddr_in);
//accept connection from an incoming client
client_sock = accept(socket_desc, (struct sockaddr *) &client, (socklen_t*) & c);
imprime(client_sock, "Bem Vindo ao BlackJack em C!!\n Você tem que fazer 21 pontos para ganhar, porém sem estourar esse limite, podendo parar após cada jogada.");
//Receive a message from client
while ((read_size = recv(client_sock, client_message, 1000, 0)) > 0) {
if (client_message[0] == 's' || client_message[0] == 'S')//buffer -> client_mes
{
jogada = randomInteger(1, 10);
totalj = (totalj + jogada);
if (jogada == 10) {
temp = '0';
} else {
temp = (char) jogada;
}
stringstream cc;
cc << "\n O valor da sua carta eh " << jogada << " e o seu total de pontos eh " << totalj;
imprime(client_sock, cc.str()); //str transforma o fluxo de string em string
if (totalj == 21) {
imprime(client_sock, "Parabens! Você é o Vencedor! \n");
close(client_sock);
totalj = 0;
break;
} else if (totalj > 21) {
stringstream cc;
cc << "Que pena você perdeu! Os seus pontos estouraram!:\n " << totalj;
imprime(client_sock, cc.str()); //str transforma o fluxo de string em string
close(client_sock);
totalj = 0;
break;
}
faz_Chamada(temp);
limpa_Buffer();
} else if (client_message[0] == 'n' || client_message[0] == 'N') {
stringstream cc;
cc << "\n Total de pontos: " << totalj;
imprime(client_sock, cc.str()); //str transforma o fluxo de string em string
close(client_sock);
totalj = 0;
break;
}
}
}
int randomInteger(int low, int high) {
int k;
double d;
srand(time(NULL));
d = (double) rand() / ((double) RAND_MAX + 1);
k = d * (high - low + 1);
return low + k;
}
void limpa_Buffer() {
int i;
for (i = 0; i < 4096; i++) {
client_message[i] = ' ';
}
}
void faz_Chamada(char variavel) {
cout << "fez chamada no cliente";
char vet[1];
vet[0] = variavel;
limpa_Buffer();
strcpy(client_message, vet);
(send(client_sock, client_message, strlen(client_message), 0)); //cliente -> client_sock
// buffer[slen] = '#include <sstream>
#include <cstdlib>
#include <string>
#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h> // socket
#include <arpa/inet.h> // inet_addr
#include <unistd.h> // write
using namespace std;
int client_sock;
struct sockaddr_in server, client;
int socket_desc, c, read_size;
char client_message[1000];
int PORTA = 4000;
int totalj = 0;
void imprime(int sock, string m);
void processarCliente();
int criar_socket_server();
int randomInteger(int low, int high);
void limpa_Buffer();
void faz_Chamada(char variavel);
void processarPC();
/*
*
*/
int main() {
int ok = 1;
//imprime(0, "this is a test!!!");
criar_socket_server();
do {
processarCliente();
} while (ok);
return 0;
}
void imprime(int sock, string m) {
write(sock, m.c_str(), m.size()); //write n aceita string, logo tranformei em vetor de char
}
int criar_socket_server() {
//Create socket
socket_desc = socket(AF_INET, SOCK_STREAM, 0);
if (socket_desc == -1) {
cout << "Could not create socket\n";
}
cout << "Socket created\n";
//Prepare the sockaddr_in structure
server.sin_family = AF_INET; // IPv4
server.sin_addr.s_addr = INADDR_ANY; // qualquer endereco
server.sin_port = htons(PORTA); // porta a esperar por conexoes
//Bind
while (bind(socket_desc, (struct sockaddr *) &server, sizeof (server)) < 0) {//socket esc -> sockfd//server->local
//print the error message
PORTA++;
cout << "Mundando para a porta " << PORTA << "\n";
server.sin_port = htons(PORTA); // porta a esperar por conexoes
}
cout << "bind done\n";
//Listen
listen(socket_desc, 3);
}
void processarCliente() {
int jogada = 0;
totalj = 0;
char temp;
//Accept and incoming connection
c = sizeof (struct sockaddr_in);
//accept connection from an incoming client
client_sock = accept(socket_desc, (struct sockaddr *) &client, (socklen_t*) & c);
imprime(client_sock, "Bem Vindo ao BlackJack em C!!\n Você tem que fazer 21 pontos para ganhar, porém sem estourar esse limite, podendo parar após cada jogada.");
//Receive a message from client
while ((read_size = recv(client_sock, client_message, 1000, 0)) > 0) {
if (client_message[0] == 's' || client_message[0] == 'S')//buffer -> client_mes
{
jogada = randomInteger(1, 10);
totalj = (totalj + jogada);
if (jogada == 10) {
temp = '0';
} else {
temp = (char) jogada;
}
stringstream cc;
cc << "\n O valor da sua carta eh " << jogada << " e o seu total de pontos eh " << totalj;
imprime(client_sock, cc.str()); //str transforma o fluxo de string em string
if (totalj == 21) {
imprime(client_sock, "Parabens! Você é o Vencedor! \n");
close(client_sock);
totalj = 0;
break;
} else if (totalj > 21) {
stringstream cc;
cc << "Que pena você perdeu! Os seus pontos estouraram!:\n " << totalj;
imprime(client_sock, cc.str()); //str transforma o fluxo de string em string
close(client_sock);
totalj = 0;
break;
}
faz_Chamada(temp);
limpa_Buffer();
} else if (client_message[0] == 'n' || client_message[0] == 'N') {
stringstream cc;
cc << "\n Total de pontos: " << totalj;
imprime(client_sock, cc.str()); //str transforma o fluxo de string em string
close(client_sock);
totalj = 0;
break;
}
}
}
int randomInteger(int low, int high) {
int k;
double d;
srand(time(NULL));
d = (double) rand() / ((double) RAND_MAX + 1);
k = d * (high - low + 1);
return low + k;
}
void limpa_Buffer() {
int i;
for (i = 0; i < 4096; i++) {
client_message[i] = ' ';
}
}
void faz_Chamada(char variavel) {
cout << "fez chamada no cliente";
char vet[1];
vet[0] = variavel;
limpa_Buffer();
strcpy(client_message, vet);
(send(client_sock, client_message, strlen(client_message), 0)); //cliente -> client_sock
// buffer[slen] = '%pre%';
limpa_Buffer();
}
';
limpa_Buffer();
}