/* ttt.c
*
* Utilizes code from P. Kearns - 1987, 2009
* Adam Carpenter - 2017
*/
#include "ttt.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
int main(int argc, char *argv[]) {
int queryFlag;
struct timeval timeout;
int i;
int errno;
int hits;
fd_set readSockets;
// fd_set writeSockets;
char message[MESSAGE_BUFF];
char playerHandle[MESSAGE_BUFF];
char opponentHandle[MESSAGE_BUFF];
char playerSide;
char opponentSide;
char gameBoard[9];
char playerMove;
int connSock;
char hostname[MAX_HOSTNAME];
char port[100];
struct sockaddr_in *serverAddr;
struct addrinfo hints, *addrlist;
i = 1;
queryFlag = FALSE;
timeout.tv_sec = 0;
timeout.tv_usec = 0;
while (argv[i]) {
if (strcmp(argv[i], "-q") == 0) {
queryFlag = TRUE;
}
else if (strcmp(argv[i], "-t") == 0) {
if (!argv[i + 1]) {
fprintf(stderr, "usage: ./ttt {-q} {-t} [timeout]\n");
exit(1);
}
timeout.tv_sec = strtol(argv[i + 1], NULL, 10);
errno = 0;
if (timeout.tv_sec <= 0) {
fprintf(stderr, "ttt: timeout must be a positive, nonzero integer.\n");
exit(1);
}
else if (errno == ERANGE) {
fprintf(stderr, "ttt: timeout must be of integer size.\n");
exit(1);
}
else if (errno == EINVAL) {
fprintf(stderr, "ttt: timeout must be integer type.\n");
exit(1);
}
i++;
}
else {
fprintf(stderr, "usage: ./ttt {-q} {-t} [timeout]\n");
exit(1);
}
i++;
}
// Get server sockaddr.
memset( &hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
if (queryFlag) {
hints.ai_socktype = SOCK_DGRAM;
}
else {
hints.ai_socktype = SOCK_STREAM;
}
hints.ai_flags = AI_NUMERICSERV;
hints.ai_protocol = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
// (Read name and port from file.)
FILE *addrfile;
if (!(addrfile = fopen("prof.falken", "r"))) {
sleep(60);
if (!(addrfile = fopen("prof.falken", "r"))) {
fprintf(stderr, "ttt: couldn't open file -- is server running?\n");
exit(1);
}
}
fscanf(addrfile, "%s\n", hostname);
fscanf(addrfile, "%s\n", port);
if (queryFlag) {
fscanf(addrfile, "%s\n", port);
}
fclose(addrfile);
if (getaddrinfo(hostname, port, &hints, &addrlist) != 0) {
fprintf(stderr, "ttt: couldn't getaddrinfo.\n");
exit(1);
}
serverAddr = (struct sockaddr_in *) addrlist->ai_addr;
if ((connSock = socket(addrlist->ai_family, addrlist->ai_socktype, 0)) < 0) {
fprintf(stderr, "ttt: couldn't create socket.\n");
exit(1);
}
if (queryFlag) { // Wait for query from server if requested.
printf("Querying server...\n");
message[0] = '\0';
timeout.tv_sec = 10;
timeout.tv_usec = 0;
setsockopt(connSock, SOL_SOCKET, SO_RCVTIMEO, (const char *) &timeout, sizeof(timeout));
sendto(connSock, "q\0", strlen("q\0"), 0, (struct sockaddr *) serverAddr, sizeof(struct sockaddr_in));
recvfrom(connSock, message, MESSAGE_BUFF, 0, NULL, NULL);
if (message[0] == '\0') {
printf("Connection timed out.\n");
}
else {
printf("%s\n", message);
}
exit(0);
}
else { // Else connect to virtual circuit with server.
if (connect(connSock, (struct sockaddr *) serverAddr, sizeof(struct sockaddr_in)) < 0) {
fprintf(stderr, "ttt: couldn't connect to socket.\n");
exit(1);
}
}
printf("Waiting for server...\n");
playerHandle[0] = '\0';
// Enter main client loop.
for(;;) {
FD_ZERO(&readSockets);
FD_SET(connSock, &readSockets);
if (timeout.tv_sec == 0) {
hits = select(FD_SETSIZE, &readSockets, NULL, NULL, NULL);
}
else {
hits = select(FD_SETSIZE, &readSockets, NULL, NULL, &timeout);
}
if (hits < 0) {
fprintf(stderr, "ttt: failed to select.\n");
exit(1);
}
else if (hits == 0) {
fprintf(stderr, "ttt: connection timed out.\n");
exit(0);
}
// Get instructions from server.
getMessage(connSock, message);
if (strcmp(message, HANDLE) == 0) { // Get and send handle.
if (playerHandle[0] == '\0') {
printf("Who are you? ");
scanf("%20[^\n]", playerHandle);
}
sendMessage(connSock, playerHandle);
printf("Waiting for opponent...\n");
}
else if (strcmp(message, ABORT) == 0) { // Abort.
printf("Server ordered shutdown. Buhbye!\n");
exit(0);
}
else if (message[0] == PLAYERID) { // Print name and sides.
sscanf(message, "p %c %c %[^\n]", &playerSide, &opponentSide, opponentHandle);
if (playerSide == 'X') {
opponentSide = 'O';
}
else {
opponentSide = 'X';
}
printf("%s, you are %cs. Your opponent %s is %cs.\n", playerHandle, playerSide, opponentHandle, opponentSide);
timeout.tv_sec = 0; // Game established -- end timeout.
}
else if (message[0] == BOARD) { // Draw the game board.
sscanf(message, "b %s", gameBoard);
printf("\n %c | %c | %c\n-----------\n %c | %c | %c\n-----------\n %c | %c | %c\n\n",
gameBoard[0], gameBoard[1], gameBoard[2],
gameBoard[3], gameBoard[4], gameBoard[5],
gameBoard[6], gameBoard[7], gameBoard[8]);
}
else if (strcmp(message, WAIT) == 0) { // Wait for opponent.
printf("Waiting for opponent...\n");
}
else if (strcmp(message, MOVE) == 0) { // Get and send move.
playerMove = '0';
while (playerMove < '1' || playerMove > '9' || gameBoard[playerMove - '0' - 1] != playerMove) {
if (playerMove != '\n') {
printf("Choose an available number on the board.\nYour move: ");
}
playerMove = getchar();
}
gameBoard[playerMove - '0' - 1] = playerSide;
strcpy(message, gameBoard);
sendMessage(connSock, message);
printf("Waiting for opponent...");
}
else if (message[0] == ENDGAME) { // End Game.
if (message[1] == playerSide) {
printf("\nYou won %s! Congratulations!\n", playerHandle);
}
else if (message[1] == opponentSide) {
printf("\nYou lost! %s won the match.\nBetter luck next time.\n", opponentHandle);
}
else {
printf("\nThe match was a tie!\nBetter luck next time.\n");
}
exit(0);
}
}
exit(0);
}
