PTR_MESSAGE generateStartGame(uint8_t type, uint16_t length, char* filename)
{
PTR_MESSAGE msg;
msg = generateMsg(type, length, filename);
if(checkStartGame(msg) == true)
{
return msg;
}
else
{
free(msg);
return NULL;
}
}
PTR_MESSAGE generateQuestionRequest(uint8_t type, uint16_t length, char* content)
{
PTR_MESSAGE msg;
msg = generateMsg(type, length, content);
if(checkQuestionRequest(msg) == true)
{
return msg;
}
else
{
free(msg);
return NULL;
}
}
PTR_MESSAGE generateErrorWarning(uint8_t type, uint16_t length, char* content)
{
PTR_MESSAGE msg;
msg = generateMsg(type, length, content);
if(checkErrorWarning(msg) == true)
{
return msg;
}
else
{
free(msg);
return NULL;
}
}
PTR_MESSAGE generateCatalogResponse(uint8_t type, uint16_t length, char* filename)
{
PTR_MESSAGE msg;
msg = generateMsg(type, length, filename);
if(checkCatalogResponse(msg) == true)
{
return msg;
}
else
{
free(msg);
return NULL;
}
return NULL;
}
PTR_MESSAGE generateLoginResponseOK(uint8_t type, uint16_t length, char* name)
{
PTR_MESSAGE msg;
msg = generateMsg(type, length, name);
if(checkLoginResponseOK(msg) == true)
{
return msg;
}
else
{
free(msg);
return NULL;
}
return NULL;
}
PTR_MESSAGE generateQuestion(uint8_t type, uint16_t length, char* content)
{
PTR_MESSAGE msg;
uint16_t* forHons;
msg = generateMsg(type, length, content);
if(checkQuestion(msg) == true)
{
forHons = (uint16_t *) &msg->content[length-2];
*forHons = htons(*forHons);
return msg;
}
else
{
free(msg);
return NULL;
}
}
int main(int argc, char **argv) {
Connection con;
int cnt, ok;
Message msg, new_msg;
longnum x, Daemon_y, mdc, new_mdc;
const char *OurName = "mima";
/************** Laden der öffentlichen und privaten Daten ***************/
if (!Get_Privat_Key(NULL, &p, &w, &x)
|| !Get_Public_Key(DAEMON_NAME, &Daemon_y))
exit(0);
LSeed(GetCurrentTime());
/******************** Verbindung zum Dämon aufbauen *********************/
//OurName = MakeNetName(NULL); /* gibt in Wirklichkeit Unix-Gruppenname zurück! */
if (strlen(OverrideNetName) > 0) {
OurName = OverrideNetName;
}
if (!(con = ConnectTo(OurName, DAEMON_NAME))) {
fprintf(stderr, "Kann keine Verbindung zum Daemon aufbauen: %s\n",
NET_ErrorText());
exit(20);
}
/*********** Message vom Typ ReportRequest initialisieren ***************/
msg.typ = ReportRequest; /* Typ setzten */
strcpy(msg.body.ReportRequest.Name, OurName); /* Gruppennamen eintragen */
Generate_MDC(&msg, &p, &mdc); /* MDC generieren ... */
Generate_Sign(&mdc, &msg.sign_r, &msg.sign_s, &x); /* ... und Nachricht unterschreiben */
/************* Nachricht abschicken, Antwort einlesen *******************/
if (Transmit(con, &msg, sizeof(msg)) != sizeof(msg)) {
fprintf(stderr, "Fehler beim Senden des 'ReportRequest': %s\n",
NET_ErrorText());
exit(20);
}
if (Receive(con, &msg, sizeof(msg)) != sizeof(msg)) {
fprintf(stderr, "Fehler beim Empfang des 'ReportResponse': %s\n",
NET_ErrorText());
exit(20);
}
/****************** Überprüfen der Dämon-Signatur ***********************/
printf("Nachricht vom Dämon:\n");
for (cnt = 0; cnt < msg.body.ReportResponse.NumLines; cnt++) {
printf("\t%s\n", msg.body.ReportResponse.Report[cnt]);
}
Generate_MDC(&msg, &p, &mdc);
ok = Verify_Sign(&mdc, &msg.sign_r, &msg.sign_s, &Daemon_y);
if (ok)
printf("Dämon-Signatur ist ok!\n");
else {
printf("Dämon-Signatur ist FEHLERHAFT!\n");
return 0;
}
/*>>>> <<<<*
*>>>> AUFGABE: Fälschen der Dämon-Signatur <<<<*
*>>>> <<<<*/
printf("Begin zu fälshen:\n");
memset(&new_msg, 0, sizeof(Message));
new_msg.typ = VerifyRequest;
generateMsg(&new_msg);
toFitMDC(&new_msg, &msg);
Generate_MDC(&new_msg, &p, &new_mdc);
if (!LCompare(&mdc, &new_mdc)) {
printf("Fälschung fertig!\n");
LCpy(&new_msg.sign_r, &msg.sign_r);
LCpy(&new_msg.sign_s, &msg.sign_s);
if (!(con = ConnectTo(OurName, DAEMON_NAME))) {
fprintf(stderr, "Kann keine Verbindung zum Daemon aufbauen: %s\n",
NET_ErrorText());
exit(20);
}
if (Transmit(con, &new_msg, sizeof(new_msg)) != sizeof(new_msg)) {
fprintf(stderr, "Fehler beim Senden des 'VerifyRequest': %s\n",
NET_ErrorText());
exit(20);
}
if (Receive(con, &msg, sizeof(msg)) != sizeof(msg)) {
fprintf(stderr, "Fehler beim Empfang des 'VerifyResponse': %s\n",
NET_ErrorText());
exit(20);
}
printf("Nachricht vom Dämon:\n");
printf("\t%s\n", msg.body.VerifyResponse.Res);
} else
printf("Fälschung gescheitert\n");
return 0;
}
/*
* Méthode qui gère la réception et le traitement des messages reçus côté
* serveur
*/
void *server_handler(void *client_datas) {
client_datas_t *datas = (client_datas_t *)client_datas;
message_parsed_t *message;
char buffer[MAX_BUFFER_SIZE];
char response[MAX_BUFFER_SIZE];
char temp_buffer[MAX_BUFFER_SIZE];
int i, longueur;
memset(buffer, 0, MAX_BUFFER_SIZE);
memset(response, 0, MAX_BUFFER_SIZE);
memset(temp_buffer, 0, MAX_BUFFER_SIZE);
for (;;) {
/* lecture du message rentrant */
if ((longueur = read(datas->client->socket, buffer, sizeof(buffer))) <= 0) {
perror("Erreur : impossible de lire le message entrant");
pthread_exit(0);
}
/*on décode le message */
message = decode(buffer);
switch (message->code) {
/* cas d'un message de multicast */
case Multicast: {
if (datas->client->is_logged) {
/* on transmet le message à chaque client */
for (i = 0; i < datas->array_client->count; i++) {
write(datas->array_client->clients[i]->socket, message->text,
strlen(message->text) + 1);
}
}
} break;
/* cas d'un message de connexion */
case Login: {
if (!datas->client->is_logged) {
/* si le mot de passe est correct */
if (strcmp(message->password, datas->server_password) == 0) {
/* set de l'username du client */
array_client_setName(datas->array_client, datas->client->socket,
message->username);
memcpy(datas->client->username, message->username,
strlen(message->username) + 1);
/* envoi d'un message de type 1 au client pour valider l'échange */
generateAckLogin(response, 1);
write(datas->client->socket, response, strlen(response) + 1);
/* multicast aux autres users pour leur signaler l'arrivée du nouvel
* user */
concat(temp_buffer, message->username, " has join the channel");
memset(response, 0, MAX_BUFFER_SIZE);
generateMulticast(response, temp_buffer);
for (i = 0; i < datas->array_client->count; i++) {
if (datas->array_client->clients[i]->socket !=
datas->client->socket) {
write(datas->array_client->clients[i]->socket, response,
strlen(response) + 1);
}
}
/* on signale que le client est identifié */
datas->client->is_logged = 1;
} else {
/* envoi d'un message d'erreur au client */
generateAckLogin(response, 0);
write(datas->client->socket, response, strlen(response) + 1);
}
}
} break;
/* cas d'un message de déconnexion */
case Leave: {
if (datas->client->is_logged) {
/* on signale au client q'il peut terminer la connexion de son côté */
generateLeave(response, "user can leave the channel");
write(datas->client->socket, response, strlen(response) + 1);
/* multicast d'un message pour annoncer le départ du client */
concat(temp_buffer, message->username, " has leave the channel");
memset(response, 0, MAX_BUFFER_SIZE);
generateMulticast(response, temp_buffer);
for (i = 0; i < datas->array_client->count; i++) {
if (datas->array_client->clients[i]->socket !=
datas->client->socket) {
write(datas->array_client->clients[i]->socket, response,
strlen(response) + 1);
}
}
/* on termine la connexion avec le client */
close(datas->client->socket);
array_client_delete(datas->array_client, datas->client->socket);
free(datas);
pthread_exit(0);
}
} break;
/* cas d'un message classique */
case Say: {
if (datas->client->is_logged) {
/* transmission du message aux autres clients */
generateMsg(response, message->username, message->text);
for (i = 0; i < datas->array_client->count; i++) {
write(datas->array_client->clients[i]->socket, response,
strlen(response) + 1);
}
}
} break;
/* cas d'un message de privé */
case Whisper: {
if (datas->client->is_logged) {
/* recherche du destinataire via son username */
client_t *destinataire = NULL;
for (i = 0; i < datas->array_client->count; i++) {
if (strcmp(datas->array_client->clients[i]->username,
message->destinataire) == 0) {
destinataire = datas->array_client->clients[i];
break;
}
}
/* envoi du message au destinataire si ce dernier existe */
if (destinataire != NULL) {
generateWhisp(response, message->username, message->destinataire,
message->text);
write(destinataire->socket, response, strlen(response) + 1);
} else {
/* envoi d'un message d'erreur au client */
generateMulticast(
response, "Erreur , le destinataire en question n'existe pas");
write(datas->client->socket, response, strlen(response) + 1);
}
}
} break;
default: {
printf("Warning : message entrant non reconnu par le protocole : %s\n",
buffer);
} break;
}
message_parsed_free(message);
}
}
