void regis(int sockFd)
{
/**
Asks client for id and password to register with.
**/
//printf("In regis.\n");
char sendMsg[MAXLINE], recvMsg[MAXLINE];
int n;
while(1)
{
// server asking for credentials
//printf("In regis\n");
//printf("server asking for credentials\n");
if((n = read(sockFd, recvMsg, MAXLINE)) < 0)
printError('r');
if(n == 0)
printError('t');
if(strlen(recvMsg) == 0)
{
fputs("Server not responding. Closing connection.", stdout);
exit(1);
}
printf("\nServer : \n%s\n", recvMsg);
printf("\nClient : \n");
fgets(sendMsg, MAXLINE, stdin);
// providing credentials to server
//printf("providing credentials to server\n");
if((n = write(sockFd, sendMsg, MAXLINE)) < 0)
printError('w');
if(n == 0)
printError('t');
// response from the server
//printf("response from the server\n");
if((n = read(sockFd, recvMsg, MAXLINE)) < 0)
printError('r');
if(n == 0)
printError('t');
stringLower(recvMsg);
printf("\nServer : \n%s\n", recvMsg);
//printf("%d", strcmp("success", recvMsg));
if(strcmp("registered successfully", recvMsg) == 0)
{
// printf("Returning to start client\n");
return;
}
}
}
long estimateImageContent(char *html, int *pNumberOfImages) {
char *cursor = html;
int numPixels = 0;
*pNumberOfImages = 0;
stringLower(html);
//check if there is a background tag
if (strstr(cursor, "background") != NULL) {
*pNumberOfImages += 1;
}
//count img tags in hmtl and total pixel values
while ((cursor = strstr(cursor, "<img")) != NULL) {
cursor++;
numPixels += dimInPixels(cursor);
*pNumberOfImages += 1;
}
return numPixels;
}
int startCommunication(int sockFd)
{
/**
Start the client communication with the server.
Return: 1, when the user has successfully logged out.
**/
//printf("In startCommunication.\n");
char sendMsg[MAXLINE], recvMsg[MAXLINE], discard[MAXLINE], temp[MAXLINE];
int n, logout = 0, retVal = 0, i = 0, crash;
// server providing options
if((n = read(sockFd, recvMsg, MAXLINE)) < 0)
printError('r');
printf("\nServer :\n%s\n", recvMsg);
r = rand()%10; // these values are generated only once, otherwise
crash = rand()%10; // they disrupt the normal flow of the communication
while(1)
{
// choosing an option
printf("%d %d %d ", rndm, r, crash);
fputs("\nClient : \n", stdout);
fgets(sendMsg, MAXLINE, stdin);
if((n = write(sockFd, sendMsg, MAXLINE)) < 0)
printError('w');
if(n == 0)
printError('t');
stringLower(sendMsg);
if(strcmp("unexpected response", sendMsg) == EQUAL)
{
while(n = read(sockFd, recvMsg, MAXLINE))
{
printf("\nServer : \n%s\n", recvMsg);
}
if(n == 0)
printError('t');
return 1;
}
if(crash == SERVERCRASH) // simulate server crash : done
{
bzero(&temp, MAXLINE);
bzero(&discard, MAXLINE);
sprintf(discard, "%d", r);
strcat(discard, sendMsg);
retVal = poll(&fd, 1, TIMEOUT);
if(retVal == 0)
{
fputs("Timeout\n", stdout);
sleep(TIMEOUT/1000);
i = 0;
while(i++ < RETRIES)
{
fputs("Retrying. Sending request again.\n", stdout);
n = write(sockFd, discard, MAXLINE);
retVal = poll(&fd, 1, TIMEOUT);
if(retVal)
if((n = read(sockFd, temp, MAXLINE)) == 0)
printError('t');
sleep(TIMEOUT/1000);
}
if(strlen(temp) > 0)
fputs(temp, stdout);
fputs("Server seems unreachable.\n", stdout);
sleep(1);
fputs("Logging out\n", stdout);
return 1;
}
}
if(rndm == r) // simulate timeout and server and client out of sync
{
r = 11;
retVal = poll(&fd, 1, TIMEOUT);
if(retVal == 0)
{
fputs("Timeout\n", stdout);
sleep(1);
i = 0;
while(i++ < RETRIES)
{
fputs("Retrying. Sending again.\n", stdout);
n = write(sockFd, sendMsg, MAXLINE);
retVal = poll(&fd, 1, TIMEOUT);
if(retVal)
if((n = read(sockFd, recvMsg, MAXLINE)) == 0)
printError('t');
sleep(1);
}
}
else
if((n = read(sockFd, recvMsg, MAXLINE)) < 0)
printError('r');
if(n == 0)
printError('t');
}
else
{
if((n = read(sockFd, recvMsg, MAXLINE)) < 0)
printError('r');
if(n == 0)
printError('t');
}
printf("\nServer : \n%s", recvMsg);
stringLower(recvMsg);
if(strcmp("logout successful.", recvMsg) == 0)
{
logout = 1;
return logout;
}
}
}
bool stringToBool(std::string sourceString)
{
stringLower(sourceString);
return ((sourceString == "true") || (sourceString != "0"));
}
