void TTRClient::go(void)
{
while (games > 0)
{
if (connected)
{
play = true;
if(!authenticated) authenticate();
else
{
if(!inGame)
{
reset(); // clear all / delete
join(); // join a game
inGame = true;
play = true;
}
while(play)
{
if(myTurn)
{
if (firstMissions)
{
sync.acquire();
commandQueue.clear();
sync.release();
}
myMethod();
firstMissions = false;
}
Thread::sleep(1);
}
// GET SCORES HERE
if(!inGame) games --;
// else would mean disconnect
}
}
}
}
void HandleTCPClient(int clntSocket, char* username, char* password)
{
char inMsg[MSGBUFSIZE+1]; /* Buffer for received string */
char outMsg[MSGBUFSIZE+1]; /* Buffer for sent string */
int bytesRcvd, bytesSent; /* Size of received message */
int totalBytesRcvd, totalBytesSent; /* Total bytes received, sent */
char randChars[RANDBUFSIZE+1]; /* Hold random string */
unsigned int iseed; /* Random seed value */
int expectedMsgLen; /* expected response length */
char clientHash[HASHBUFSIZE]; /* holds client's hash string */
char serverHash[HASHBUFSIZE]; /* holds server's hash string */
char fileLine[LINEBUFSIZE];
int done=0;
/* usernames and passwords that the system supports */
char* credentials[6] = {username, password, "Bob", "123", "Sally", "111"};
/*expected length of first message, to ensure we get all the bytes */
expectedMsgLen = strlen(AUTH_REQUEST);
//Receive authentication request
totalBytesRcvd = 0;
while (totalBytesRcvd < expectedMsgLen) { //ensure all bytes are received
bytesRcvd = recv(clntSocket, inMsg+totalBytesRcvd, MSGBUFSIZE-totalBytesRcvd, 0);
if(bytesRcvd!=-1)
totalBytesRcvd+= bytesRcvd;
}
inMsg[totalBytesRcvd] = '\0';
printf("Received Message: \"%s\"\n\n", inMsg); //check
//generate a random 64-character string based on time
iseed = (unsigned int)time(NULL);
srand (iseed);
int i;
for(i=0; i<RANDBUFSIZE; i++) {
randChars[i] = (char)((rand() % 26)+ 97); // = a random, lower-case letter
}
//add a newline character
randChars[RANDBUFSIZE] = '\0'; //terminate the string
strcpy(outMsg, randChars); //copy the random string to the send buffer
outMsg[RANDBUFSIZE]='\n';
outMsg[RANDBUFSIZE+1]='\0';
//send the random string
totalBytesSent = 0;
while (totalBytesSent < strlen(outMsg)) //ensure all bytes are sent
{
if ((bytesSent = send(clntSocket, outMsg + totalBytesSent,
strlen(outMsg) - totalBytesSent, 0)) <= 0)
DieWithError("send() failed or connection closed prematurely");
totalBytesSent += bytesSent; /* Keep tally of total bytes */
}
outMsg[RANDBUFSIZE] = '\0'; //get rid of new line character
printf("Sending random string: \"%s\"\n\n", outMsg); //check
//receive the "username:hash" from the Client
totalBytesRcvd = 0;
expectedMsgLen = 1+32; //we should at least receive ':' + 32 byte hash string
while (totalBytesRcvd < expectedMsgLen) { //ensure all bytes are received
bytesRcvd = recv(clntSocket, inMsg+totalBytesRcvd, MSGBUFSIZE-totalBytesRcvd, 0);
if(bytesRcvd!=-1)
totalBytesRcvd+= bytesRcvd;
}
inMsg[totalBytesRcvd] = '\0'; //terminate the string
printf("Received Message: \"%s\"\n\n", inMsg); //print received data
//split the string into username and hash
char* delim = ":"; //delimiter for split
username = strtok(inMsg,delim);
strcpy(clientHash, strtok(NULL, delim));
printf("Split message into \"%s\" and \"%s\"\n\n", username, clientHash);
//see if username is on file, checking every other string in credentials
fputs("Checking Username...",stdout);
int found = 0;
for (i=0; i<sizeof(credentials)/4; i+=2) //i < number of strings in credentials
if(strcmp(username, credentials[i])==0) { //if found
found = 1;
password = credentials[i+1]; //pull the password
}
//if username is valid
if (found) {
printf("found %s\n\n",username);
//concatenate username, password, and 64 character string
sprintf(serverHash, "%s", username);
sprintf(serverHash+strlen(username), "%s", password);
sprintf(serverHash+strlen(username)+strlen(password), "%s", randChars);
// serverHash[strlen(username)+strlen(password)+strlen(randChars)]='\n';
// serverHash[strlen(username)+strlen(password)+strlen(randChars)+1]='\0';
printf("String to be hashed: \"%s\"\n\n", serverHash);
//hash the concatenation
md5_byte_t* string = (md5_byte_t*) serverHash;
md5_state_t state;
md5_byte_t digest[16];
myMethod(&state, digest, string);
for(i = 0; i < 16; i++)
sprintf(serverHash+(i*2), "%02x", digest[i]);
printf("Hash result: \"%s\"\n\n", serverHash);
//compare client and server hash results
if (strcmp(serverHash, clientHash)==0) { //if they match
puts("Successful login, notifying client.\n");
/* prepare send buffer */
sprintf(outMsg, "%s\n", AUTH_SUCCESS);
}
else { //username was found, so must be a bad password
puts("Bad password, notifying client.\n");
/* prepare send buffer */
sprintf(outMsg,"%s\n", AUTH_BAD_PASS);
done=1;
}
}
//username is not valid
else {
puts("Bad username, notifying client.\n");
/* prepare send buffer */
sprintf(outMsg, "%s\n", AUTH_BAD_USR);
done=1;
}
//send authentication status
totalBytesSent = 0;
//outMsg[RANDBUFSIZE-1] = '\n';
while (totalBytesSent < strlen(outMsg)) //ensure all bytes are sent
{
if ((bytesSent = send(clntSocket, outMsg + totalBytesSent,
strlen(outMsg) - totalBytesSent, 0)) <= 0)
DieWithError("send() failed or connection closed prematurely");
totalBytesSent += bytesSent; /* Keep tally of total bytes */
}
int caseNum; //which switch case to take
char* filename; //if file request, name of file to be retrieved
char* command; //the command given
/* Now that the user has authenticated, we listen for commands and
take the appropriate actions. For now, the only commands supported
are file requests and close connection. The server will continue to
listen here until the "close" command is issued by the client. */
while(!done) {
//get the command message from the server
totalBytesRcvd = 0;
while (totalBytesRcvd==0) {
bytesRcvd = recv(clntSocket, inMsg+totalBytesRcvd, MSGBUFSIZE-totalBytesRcvd, 0);
if(bytesRcvd!=-1)
totalBytesRcvd+= bytesRcvd;
}
inMsg[totalBytesRcvd] = '\0'; //terminate the string
command = strtok(inMsg,DELIM); //DELIM is space character
caseNum = 0;
if (command != NULL) { //either close the connection or send file contents
if (strcmp(command, CLOSE)==0)
caseNum = 1;
if (strcmp(command, FILE_REQUEST)==0)
caseNum = 2;
}
switch(caseNum) {
case 0:
break;
case 1: //close the connection, and go back to listening for connection requests
done=1;
break;
case 2: //send file contents to user
filename = strtok(NULL,delim); //the second parameter is the filename
printf("Retrieving File: %s\n\n", filename);
fr = fopen (filename, "rt"); // open the file for reading
if (fr == NULL) { //file not found, notify client
sprintf(outMsg, "%s\n", FILE_NOT_FOUND);
puts(outMsg);
totalBytesSent = 0;
while(totalBytesSent < strlen(outMsg)) { // +1 for newline
bytesSent = send(clntSocket, outMsg+totalBytesSent,
strlen(outMsg)-totalBytesSent, 0);
if (bytesSent > 0) totalBytesSent += bytesSent;
}
}
else { //otherwise send contents line by line to the client
strcpy(fileLine,""); //set fileLine to ""
while (fgets (fileLine , LINEBUFSIZE-1 , fr) != NULL ) {
fileLine[strlen(fileLine)-1]='\n';
fileLine[strlen(fileLine)]= '\0';
send(clntSocket, fileLine, strlen(fileLine), 0);
}
if(strcmp(fileLine,"")==0) { //if file is empty
sprintf(fileLine, "%s\n", EMPTY_FILE);
send(clntSocket, fileLine, strlen(fileLine), 0);
}
fclose (fr); //close the file handle
}
//send message terminator to client
sprintf(outMsg, "%s\n", EOM);
totalBytesSent=0;
while(totalBytesSent < strlen(outMsg)) {
bytesSent = send(clntSocket, outMsg+totalBytesSent,
strlen(outMsg)-totalBytesSent, 0);
if (bytesSent > 0) totalBytesSent += bytesSent;
}
break;
}
}
puts("Finished. Closing connection.");
close(clntSocket); /* Close client socket */
}
void HandleTCPClient(int clntSocket, char* username, char* password)
{
char inMsg[MSGBUFSIZE+1]; /* Buffer for received string */
char outMsg[MSGBUFSIZE+1]; /* Buffer for sent string */
int bytesRcvd, bytesSent; /* Size of received message */
int totalBytesRcvd, totalBytesSent; /* Total bytes received, sent */
char randChars[RANDBUFSIZE+1]; /* Hold random string */
unsigned int iseed; /* Random seed value */
int expectedMsgLen; /* expected response length */
char clientHash[HASHBUFSIZE]; /* holds client's hash string */
char serverHash[HASHBUFSIZE]; /* holds server's hash string */
/* usernames and passwords that the system supports */
char* credentials[6] = {username, password, "Bob", "123", "Sally", "111"};
/*expected length of first message, to ensure we get all the bytes */
expectedMsgLen = strlen(AUTH_REQUEST);
//Receive authentication request
totalBytesRcvd = 0;
while (totalBytesRcvd < expectedMsgLen) { //ensure all bytes are received
if ((bytesRcvd = recv(clntSocket, inMsg+totalBytesRcvd,
MSGBUFSIZE-totalBytesRcvd, 0)) < 0)
DieWithError("recv() failed");
totalBytesRcvd+= bytesRcvd;
}
inMsg[totalBytesRcvd] = '\0';
printf("Received Message: \"%s\"\n\n", inMsg); //check
//generate a random 64-character string based on time
iseed = (unsigned int)time(NULL);
srand (iseed);
int i;
for(i=0; i<RANDBUFSIZE; i++) {
randChars[i] = (char)((rand() % 26)+ 97); // = a random, lower-case letter
}
randChars[RANDBUFSIZE] = '\0'; //terminate the string
strcpy(outMsg, randChars); //copy the random string to the send buffer
printf("Sending random string: \"%s\"\n\n", outMsg); //check
//send the random string
totalBytesSent = 0;
while (totalBytesSent < strlen(outMsg)) //ensure all bytes are sent
{
if ((bytesSent = send(clntSocket, outMsg + totalBytesSent,
strlen(outMsg) - totalBytesSent, 0)) <= 0)
DieWithError("send() failed or connection closed prematurely");
totalBytesSent += bytesSent; /* Keep tally of total bytes */
}
//receive the "username:hash" from the Client
totalBytesRcvd = 0;
expectedMsgLen = strlen(username)+1+32; //username + ':' + 32 byte hash string
while (totalBytesRcvd < expectedMsgLen) { //ensure all bytes are received
if ((bytesRcvd = recv(clntSocket, inMsg+totalBytesRcvd,
MSGBUFSIZE-totalBytesRcvd, 0)) < 0)
DieWithError("recv() failed");
totalBytesRcvd+= bytesRcvd;
}
inMsg[totalBytesRcvd] = '\0'; //terminate the string
printf("Received Message: \"%s\"\n\n", inMsg); //print received data
//split the string into username and hash
char* delim = ":"; //delimiter for split
username = strtok(inMsg,delim);
strcpy(clientHash, strtok(NULL, delim));
printf("Split message into \"%s\" and \"%s\"\n\n", username, clientHash);
//see if username is on file, checking every other string in credentials
fputs("Checking Username...",stdout);
int found = 0;
for (i=0; i<sizeof(credentials)/4; i+=2) //i < number of strings in credentials
if(strcmp(username, credentials[i])==0) { //if found
found = 1;
password = credentials[i+1]; //pull the password
}
//if username is valid
if (found) {
printf("found %s\n\n",username);
//concatenate username, password, and 64 character string
sprintf(serverHash, "%s", username);
sprintf(serverHash+strlen(username), "%s", password);
sprintf(serverHash+strlen(username)+strlen(password), "%s", randChars);
printf("String to be hashed: \"%s\"\n\n", serverHash);
//hash the concatenation
md5_byte_t* string = (md5_byte_t*) serverHash;
md5_state_t state;
md5_byte_t digest[16];
myMethod(&state, digest, string);
for(i = 0; i < 16; i++)
sprintf(serverHash+(i*2), "%02x", digest[i]);
printf("Hash result: \"%s\"\n\n", serverHash);
//compare client and server hash results
if (strcmp(serverHash, clientHash)==0) { //if they match
puts("Successful login, notifying client.\n");
/* prepare send buffer */
strcpy(outMsg,"Successful Login");
}
else { //username was found, so must be a bad password
puts("Bad password, notifying client.\n");
/* prepare send buffer */
strcpy(outMsg,"Authentication failed: incorrect password");
}
}
//username is not valid
else {
puts("Bad username, notifying client.\n");
/* prepare send buffer */
sprintf(outMsg, "The username %s does not exist", username);
}
//send authentication status
totalBytesSent = 0;
while (totalBytesSent < strlen(outMsg)) //ensure all bytes are sent
{
if ((bytesSent = send(clntSocket, outMsg + totalBytesSent,
strlen(outMsg) - totalBytesSent, 0)) <= 0)
DieWithError("send() failed or connection closed prematurely");
totalBytesSent += bytesSent; /* Keep tally of total bytes */
}
puts("Finished. Closing connection.");
close(clntSocket); /* Close client socket */
}
