ref: ea3be59529a3aeb354b86789f0790575cb2b77e3
dir: /srv4.c/
/*
* glendy (unix) server, 4th revision
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <time.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "unix.h"
#include "engine.h"
#include "util.h"
#include "srv.h"
#define playersock sockfd[turn % 2]
int listenfd;
int port = 1768;
int debug = 1;
char syncmsg[8];
int sockfd[2];
int gcount = 0;
int id = 0;
pthread_mutex_t game_lock;
Game games[32];
pthread_t threads[32][2];
static void
error(const char *msg)
{
perror(msg);
pthread_exit(NULL);
}
static void
cleanup(int game)
{
dprint("cleanup(%d)\n", game);
close(games[game].sockfd[0]);
close(games[game].sockfd[1]);
}
static void
printclients(char *fmt, ...)
{
int i;
/* it seems arg gets changed during the first call to vprint, thus we need two */
va_list arg, arg2;
va_start(arg, fmt);
va_start(arg2, fmt);
vfprint(sockfd[0], fmt, arg);
vfprint(sockfd[1], fmt, arg2);
va_end(arg);
va_end(arg2);
}
int
setuplistener(int portno)
{
int sockfd, option = 1;
struct sockaddr_in serv_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening listener socket.");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR binding listener socket.");
dprint("listener on\n");
return sockfd;
}
void
drawlevel(void)
{
/* prints first row, this assumes SzX = SzY, is there a better way? */
print("T%2d|", turn);
for(int i = 0 ; i < SzX ; i++)
print("%2d |", i);
dprint(" G%2d\n", id);
for(int x = 0; x < SzX; x++)
{
for(int i = 0 ; i < SzY+1 ; i++)
print("----");
print(x % 2 ? "\\" : "/");
print("\n");
/* show column number and have a zig-zag effect */
print("%2d %s|", x, x % 2 ? " " : "");
for(int y = 0; y < SzY; y++)
{
/* it's [y][x], not [x][y] */
switch(grid[y][x])
{
case Wall:
print(" * |");
break;
case Glenda:
/* fancy effect for glenda's face */
print(" g |");
break;
default:
print(" |");
break;
}
}
print("\n");
}
}
void
sendlevel(void)
{
if(state == Start)
{
printclients("INIT\n");
for(int x = 0; x < SzX; x++)
{
for(int y = 0; y < SzY; y++)
{
switch(grid[x][y])
{
case Wall:
printclients("w %d %d\n", x, y);
break;
case Glenda:
printclients("g %d %d\n", x, y);
break;
}
}
}
printclients("SENT\n");
}
else if(state == Playing)
{
printclients("SYNC %d %s\n", turn, syncmsg);
}
else
{
printclients("SYNC %d %s\n", turn, syncmsg);
if(state == Won)
{
dprint("hah, trapper won\n");
fprint(sockfd[0], "WON\n");
fprint(sockfd[1], "LOST\n");
}
else if(state == Lost)
{
dprint("welp, trapper lost\n");
fprint(sockfd[0], "LOST\n");
fprint(sockfd[1], "WON\n");
}
cleanup(id);
return;
}
dprint("Game %d, Turn is %d, min = %d\n", id, turn, findmin(findglenda()));
fprint(playersock, "TURN\n");
fprint(sockfd[!(turn % 2)], "WAIT\n");
}
/* p x y */
void
proc_put(char *s)
{
char *xpos, *ypos;
unsigned int x, y, r;
xpos = strtok(s, " ");
ypos = strtok(nil, " ");
if(xpos == nil || ypos == nil)
{
fprint(playersock, "ERR INVALIDINPUT proc_put():"
"not enough arguments or malformed string\n");
return;
}
if(!isnum(xpos, strlen(xpos)) || !isnum(ypos, strlen(ypos)))
{
fprint(playersock, "ERR invalidinput proc_put():"
"expected string in %s and %s\n", xpos, ypos);
return;
}
/* engine assumes it's XY, protocol assumes it's YX */
x = atoi(xpos);
y = atoi(ypos);
dprint("put %d %d\n", x, y);
if(x >= SzX || x < 0 || y >= SzY || y < 0)
{
fprint(playersock, "ERR invalidinput proc_put(): %d %d\n", x, y);
return;
}
r = doput(Pt(x, y));
if(r == Wall)
fprint(playersock, "WALL %d %d\n", x, y);
else if(r == Glenda)
fprint(playersock, "GLND %d %d\n", x, y);
else
{
sprint(syncmsg, "%u %u", x, y);
syncmsg[7] = '\0';
dprint("syncmsg = %s\n", syncmsg);
}
}
/* m x y */
void
proc_move(char *s)
{
int d;
Point p;
p = findglenda();
d = strtodir(s);
if(d == Err)
{
fprint(playersock, "ERR invalidinput proc_move(): %s\n", s);
return;
}
if(domove(d) == Wall)
{
fprint(playersock, "WALL %s %d %d\n", s, p.x, p.y);
return;
}
else
{
strncpy(syncmsg, s, 7);
/* better be safe than sorry */
syncmsg[7] = '\0';
dprint("syncmsg = %s\n", syncmsg);
}
}
/*
* handle input, which is in the form of:
* trapper> p xx yy
* puts a wall in xx yy
* glenda> m {NE, E, SE, SW, W, NW}
* moves the bunny
* > q
* quits the game
*/
int
proc(int player, char *s)
{
char *t;
int oturn, n;
/* early return paths */
if(*s == '\0' || *s == 'q')
{
fprint(sockfd[player], "DIE disconnected\n");
fprint(sockfd[!player], "DIE other client have been disconnected\n");
/* mmhm... what happens if we close a fd we are reading from? */
cleanup(id);
return Err;
}
else if(turn % 2 != player)
{
fprint(sockfd[player], "ERR WAIT\n");
return Ok;
}
oturn = turn;
/* s+2 skips command and first space after it */
switch(*s)
{
case 'p':
if(turn % 2 == 0)
proc_put(s+2);
else if(turn % 2 == 1)
fprint(playersock, "CANTP\n");
break;
case 'm':
if(turn % 2 == 0)
fprint(playersock, "CANTM\n");
else if(turn % 2 == 1)
proc_move(s+2);
break;
default:
fprint(playersock, "ERR proc() unkown command %c\n", *s);
}
/* only print the map if turn have changed */
if(turn != oturn)
{
if(debug)
drawlevel();
sendlevel();
}
return Ok;
}
static char*
input(int game, int player)
{
char *s, c;
int n = 0;
/* sang bozorg */
s = emalloc(1024);
memset(s, 0, 1024);
/* we could use local variables, but that not worth the trouble */
while((c = read(games[game].sockfd[player], s+n, 1) == 1) && n < 1024)
{
if(s[n] == '\n' || s[n] == '\0')
{
s[n] = '\0';
break;
}
n++;
}
dprint("[G%2d/P%2d], got input: %s\n", game, player, s);
return s;
}
/*
* most of game engine's works on global variables
* set the global variables with one game from the array
*/
static void
loadgame(int n)
{
if(n > sizeof(games) / sizeof(Game))
sysfatal("loadgame(%d): invalid game", n);
id = games[n].id;
difficulty = games[n].difficulty;
state = games[n].state;
turn = games[n].turn;
strncpy(syncmsg, games[n].syncmsg, 8);
sockfd[0] = games[n].sockfd[0];
sockfd[1] = games[n].sockfd[1];
memcpy(grid, games[n].grid, sizeof(grid));
}
static void
setgame(int n)
{
if(n > sizeof(games) / sizeof(Game))
sysfatal("setgame(%d): invalid game", n);
/* id got to change when we set game */
id = n;
games[n].id = n;
games[n].difficulty = difficulty;
games[n].state = state;
games[n].turn = turn;
games[n].sockfd[0] = sockfd[0];
games[n].sockfd[1] = sockfd[1];
memcpy(games[n].grid, grid, sizeof(grid));
}
/* player is either 0 or 1, trapper or glenda */
static void
clienthandler(void *data)
{
int res, player, game;
char *s;
game = ((int*)data)[0];
player = ((int*)data)[1];
for(;;)
{
/* most of time is spent here */
s = input(game, player);
if(!strcmp(s, ""))
{
cleanup(game);
break;
}
pthread_mutex_lock(&game_lock);
loadgame(game);
res = proc(player, s);
setgame(game);
pthread_mutex_unlock(&game_lock);
free(s);
}
}
void
srv(int listenfd)
{
int clientfd[2], res[2];
socklen_t clilen;
struct sockaddr_in servaddr, clientaddr;
int tdata[2][2];
while(gcount < 32)
{
for(int conns = 0 ; conns < 2 ; conns++)
{
listen(listenfd, 64);
memset(&clientaddr, 0, sizeof(clientaddr));
clilen = sizeof(clientaddr);
clientfd[conns] = accept(listenfd, (struct sockaddr *) &clientaddr, &clilen);
if(clientfd[conns] < 0)
error("srv(): failed to accept connection");
fprint(clientfd[conns], "CONN %d\n", conns);
dprint("game %d: srv(): client %d connected\n", gcount, conns);
if(conns == 0)
fprint(clientfd[conns], "WAIT\n");
}
pthread_mutex_lock(&game_lock);
gcount++;
sockfd[0] = clientfd[0];
sockfd[1] = clientfd[1];
initlevel();
setgame(gcount);
if(debug)
drawlevel();
sendlevel();
pthread_mutex_unlock(&game_lock);
tdata[0][0] = gcount;
tdata[0][1] = 0;
tdata[1][0] = gcount;
tdata[1][1] = 1;
res[0] = pthread_create(&threads[gcount][0], NULL, (void*)clienthandler, (void*)tdata[0]);
res[1] = pthread_create(&threads[gcount][1], NULL, (void*)clienthandler, (void*)tdata[1]);
if(res[0] || res[1])
{
dprint("pthread_create() failed: %d\n", res[0] ? res[0] : res[1]);
exit(-1);
}
else
dprint("threads for game %d are created\n", gcount);
}
}
int
main(int argc, char **argv)
{
/* it might not be a real human */
ptype[0] = Human;
ptype[1] = Human;
listenfd = setuplistener(port);
pthread_mutex_init(&game_lock, NULL);
/* OpenBSD ignores this */
srand(time(nil));
srv(listenfd);
close(listenfd);
pthread_mutex_destroy(&game_lock);
pthread_exit(NULL);
return 0;
}