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server.c
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server.c
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/*
** server.c -- a battle server game with chat mechanics
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "Queue.h"
#include "ctcp_linked_list.c"
#define PORT "9034" // port we're listening on
#define STDIN 0 //STDIN
#define MAXDATASIZE 256
/*This is a struct for a Monster. It has 3 parameters
A Name, Health, and Physical Attack */
typedef struct Monster
{
char* Name;
int HP;
int PATK;
}Monster;
/*This is a struct for a Player. It has 5 parameters
A Name, Heath, Physical Attack, File Descriptor, and Defense*/
typedef struct Client
{
char* Name;
int HP;
int PATK;
int fd;
int DEF;
}Client;
/*This function's purpose is to delay is to slow down
how fast the cpu sends msgs to the Clients
This function takes in one parameter, int */
void delay(int number_of_seconds)
{
// Converting time into milli_seconds
int milli_seconds = 1000 * number_of_seconds;
// Stroing start time
clock_t start_time = clock();
// looping till required time is not acheived
while (clock() < start_time + milli_seconds)
;
}
/*This function's purpose is to generate the monster's stats */
Monster MonsterGen(Monster M, int i, int j, int fdmax, int listener, fd_set master)
{
char resp[MAXDATASIZE];
M.Name = "Slime Boss";
M.HP = 500;
M.PATK = 30;
memset(resp, 0, sizeof(resp));
strcpy(resp, "\nMonster name: Slime Boss \nAttack range: 5-10\nHealth range: 500-800\n");
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
delay(3);
}
}
}
return M;
}
/*This functions purpose is to send a message to the client when they accept the game*/
void acceptance(int i)
{
char resp[MAXDATASIZE];
memset(resp, 0, sizeof(resp));
strcpy(resp, "\n- - - - - - -\nAcknowledged |\n- - - - - - -\n\n- - - - - - -Chat Active- - - - - - -\n");
send(i, resp, sizeof(resp), 0);
}
/*This function's purpose is to generate the Player inital stats */
Client PlayerGen(Client P, int i, int j, int fdmax, int listener, fd_set master)
{
char resp[MAXDATASIZE];
P.HP = 100;
P.PATK = 30;
P.DEF = 10;
P.fd = i;
memset(resp, 0, sizeof(resp));
strcpy(resp, "Player Stats:\nClient name: The Hero \nAttack: 30\nHealth : 100\n - - - - - - - - \n");
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
delay(3);
}
}
}
return P;
}
/*This function's purpose is to help the system change the Player's stats after their choices */
Client Player_stats(Queue *history, Client Player, Monster M)
{
//system plays
if (strcmp(front(history), "Defend")== 0){Player.HP = (Player.HP + (8));}
if (strcmp(front(history), "Heal") == 0)
{
if (Player.HP + (Player.HP*0.33) >= Player.HP){Player.HP = 100;}
else {Player.HP = (Player.HP*0.33);}
}
return Player;
}
/*This function's purpose is to check if the Monster Wins or if the Clients with */
void End_Game(Monster M, Client Player, int j, int fdmax, int listener, fd_set master, int clients, linked_list_t *fdlist)
{
char resp[MAXDATASIZE];
if(M.HP <= 0)
{
memset(resp, 0, sizeof(resp));
strcpy(resp, "You Win.");
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
close(j); // bye!
FD_CLR(j, &master); // remove from master set
ll_node_t *node = fdlist->head;
ll_remove(fdlist, node);
clients--;
}
}
}
}
if(Player.HP <= 0)
{
memset(resp, 0, sizeof(resp));
strcpy(resp, "You Lose.\nBetter luck next time.");
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
close(j); // bye!
FD_CLR(j, &master); // remove from master set
ll_node_t *node = fdlist->head;
ll_remove(fdlist, node);
clients--;
}
}
}
}
}
// get sockaddr, IPv4 or IPv6:
void *get_in_addr(struct sockaddr *sa)
{
return &(((struct sockaddr_in*)sa)->sin_addr);
}
int main(void)
{
fd_set master; // master file descriptor list
fd_set read_fds; // temp file descriptor list for select()
int fdmax; // maximum file descriptor number
Queue *history = createQueue(4); //Queue of Capacity 4
//int turn_count = 0;
Client Player; //Player Creation
Monster M; //Monster Creation
linked_list_t *fdlist;
linked_list_t *Players;
fdlist = ll_create();
Players = ll_create();
int listener; // listening socket descriptor
int newfd; // newly accept()ed socket descriptor
struct sockaddr_storage remoteaddr; // client address
socklen_t addrlen;
char buf[MAXDATASIZE]; // buffer for client data
char msg[MAXDATASIZE]; // buffer for STDIN
char resp[MAXDATASIZE]; // buffer for responses
int nbytes, msgbytes;
char remoteIP[INET6_ADDRSTRLEN];
int yes=1; // for setsockopt() SO_REUSEADDR, below
int i, j, rv, clients;
struct addrinfo hints, *ai, *p;
FD_ZERO(&master); // clear the master and temp sets
FD_ZERO(&read_fds);
// get us a socket and bind it
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if ((rv = getaddrinfo(NULL, PORT, &hints, &ai)) != 0) {
fprintf(stderr, "selectserver: %s\n", gai_strerror(rv));
exit(1);
}
for(p = ai; p != NULL; p = p->ai_next) {
listener = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if (listener < 0) {
continue;
}
// lose the pesky "address already in use" error message
setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
if (bind(listener, p->ai_addr, p->ai_addrlen) < 0) {
close(listener);
continue;
}
break;
}
// if we got here, it means we didn't get bound
if (p == NULL) {
fprintf(stderr, "selectserver: failed to bind\n");
exit(2);
}
freeaddrinfo(ai); // all done with this
// listen
if (listen(listener, 10) == -1) {
perror("listen");
exit(3);
}
// add the listener to the master set
FD_SET(listener, &master);
FD_SET(STDIN, &master);
// keep track of the biggest file descriptor
fdmax = listener; // so far, it's this one
fprintf(stderr, "Server Has Started\n");
// main loop
for(;;) {
read_fds = master; // copy it
if (select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1) {
exit(4);
}
// run through the existing connections looking for data to read
for(i = 0; i <= fdmax; i++) {
if (FD_ISSET(i, &read_fds)) { // we got one!!
if (i == listener) {
// handle new connections
addrlen = sizeof remoteaddr;
newfd = accept(listener,
(struct sockaddr *)&remoteaddr,
&addrlen);
if (newfd == -1) {
perror("accept");
} else {
FD_SET(newfd, &master); // add to master set
if (newfd > fdmax) { // keep track of the max
fdmax = newfd;
}
fprintf(stderr, "selectserver: new connection from %s on "
"socket %d\n",
inet_ntop(remoteaddr.ss_family,
get_in_addr((struct sockaddr*)&remoteaddr),
remoteIP, INET6_ADDRSTRLEN),
newfd);
}
} else if (FD_ISSET(STDIN, &read_fds)) //SERVER TYPES
{
memset(msg, 0, sizeof(msg));
msgbytes = read(STDIN, msg, sizeof(msg));
char c[MAXDATASIZE];
memset(c, 0, sizeof(c));
sprintf(c, "SERVER: %s", msg);
if(strcmp(msg, "Stop\n")== 0)
{
strcpy(c, "Server is now closing");
for(j = 0; j <= fdmax; j++) {
// send to everyone!
if (FD_ISSET(j, &master)) {
// except the listener and ourselves
if (j != listener && j != i) {
if (send(j, c, sizeof(c), 0) == -1) {
perror("send");
}
}
}
}
close(i);
}
else
{
for(j = 0; j <= fdmax; j++) {
// send to everyone!
if (FD_ISSET(j, &master)) {
// except the listener and ourselves
if (j != listener && j != i) {
if (send(j, c, msgbytes+10, 0) == -1) {
perror("send");
}
}
}
}
}
}
else
{
memset(buf, 0, sizeof(buf));
nbytes = recv(i, buf, sizeof(buf), 0);
// handle data from a client
if (nbytes <= 1) { //CONNECTION KILLED
// got error or connection closed by client
if (nbytes <= 1)
{
// connecton closed
fprintf(stderr, "selectserver: socket %d hung up\n", i);
}
else
{
perror("recv");
}
close(i); // bye!
FD_CLR(i, &master); // remove from master set
ll_node_t *node = fdlist->head;
ll_remove(fdlist, node);
clients--;
} else {
int inside = 2;
inside = ll_find(fdlist, i);
// we got some data from a client
if (strcmp(buf, "Accept\n") == 0 && inside == 0)
{
ll_add(fdlist, &i, i);
clients++;
acceptance(i);
if (clients == 4) //Start Game
{
memset(resp, 0, sizeof(resp));
strcpy(resp, "\n- - - - - - -All Players Ready- - - - - - -\n\nPrepare Yourselves\n- - - - - - - \n");
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
}
}
}
M = MonsterGen(M, i, j, fdmax, listener, master); //sends Monster Stats
Player = PlayerGen(Player, i, j, fdmax, listener, master); //sends Player Stats
}
}
else if (strcmp(buf, "Attack\n") == 0)
{
Enqueue(history, buf);
memset(resp, 0, sizeof(resp));
sprintf(resp, "Client %i has chosen to ATTACK\n", i);
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener && j != i) {
send(j, resp, sizeof(resp), 0);
}
}
}
if (Qlength(history) == 4)
{
for(int o = 0; o = Qlength(history); o++)
{
if (strcmp(front(history), "Attack") == 0) {M.HP = M.HP - Player.PATK;}
Player = Player_stats(history, Player, M);
history = Dequeue(history);
}
Player.HP = Player.HP - M.PATK;
//SEND Update TO PLAYERS
memset(resp, 0, sizeof(resp));
sprintf(resp, "\n- - - - - UPDATE - - - - - \nMonster name: Slime Boss \nMonster has %i of HP left\nYou have %i of HP left\n - - - - - - - - - - - - - - \n", M.HP, Player.HP);
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
delay(3);
}
}
}
End_Game(M, Player, j, fdmax, listener, master, clients, fdlist);
}
}
else if (strcmp(buf, "Defend\n") == 0)
{
Enqueue(history, buf);
memset(resp, 0, sizeof(resp));
sprintf(resp, "Client %i has chosen to DEFEND\n", i);
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener && j != i) {
send(j, resp, sizeof(resp), 0);
}
}
}
if (Qlength(history) == 4)
{
for(int o = 0; o = Qlength(history); o++)
{
if (strcmp(front(history), "Attack") == 0) {M.HP = M.HP - Player.PATK;}
Player = Player_stats(history, Player, M);
history = Dequeue(history);\
}
Player.HP = Player.HP - M.PATK;
//SEND Update TO PLAYERS
memset(resp, 0, sizeof(resp));
sprintf(resp, "\n- - - - - UPDATE - - - - - \nMonster name: Slime Boss \nMonster has %i of HP left\nYou have %i of HP left\n - - - - - - - - - - - - - - \n", M.HP, Player.HP);
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
delay(3);
}
}
}
End_Game(M, Player, j, fdmax, listener, master, clients, fdlist);
}
}
else if (strcmp(buf, "Heal\n") == 0)
{
Enqueue(history, buf);
memset(resp, 0, sizeof(resp));
sprintf(resp, "Client %i has chosen to HEAL\n", i);
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener && j != i) {
send(j, resp, sizeof(resp), 0);
}
}
}
if (Qlength(history) == 4)
{
for(int o = 0; o = Qlength(history); o++)
{
if (strcmp(front(history), "Attack") == 0) {M.HP = M.HP - Player.PATK;}
Player = Player_stats(history, Player, M);
history = Dequeue(history);
}
Player.HP = Player.HP - M.PATK;
//SEND Update TO PLAYERS
memset(resp, 0, sizeof(resp));
sprintf(resp, "\n- - - - - UPDATE - - - - - \nMonster name: Slime Boss\nMonster has %i of HP left\nYou have %i of HP left\n - - - - - - - - - - - - - \n", M.HP, Player.HP);
for(j = 0; j <= fdmax; j++)
{
if (FD_ISSET(j, &master)) {
if (j != listener) {
send(j, resp, sizeof(resp), 0);
delay(3);
}
}
}
End_Game(M, Player, j, fdmax, listener, master, clients, fdlist);
}
}
else
{
char c[MAXDATASIZE];
memset(c, 0, sizeof(c));
sprintf(c, "Chat: %s", buf);
c[nbytes+5] = '\0';
//Chat in Room
for(j = 0; j <= fdmax; j++)
{
// send to everyone!
if (FD_ISSET(j, &master)) {
// except the listener and ourselves
int inside = 2;
inside = ll_find(fdlist, j);
if (j != listener && j != i && inside == 1) {
send(j, c, nbytes+6, 0);
}
}
}
}
}
} // END handle data from client
} // END got new incoming connection
} // END looping through file descriptors
} // END for(;;)--and you thought it would never end!
return 0;
}