ref: bfb0b73973064f192d97eb56fb56b1737a9c981f
dir: /srv5.c/
/*
* glendy (unix) server, 5th revision
* leaks memory, often, quick and well.
*/
#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 <ctype.h>
#include "unix.h"
#include "engine.h"
#include "util.h"
#include "srv.h"
int listenfd;
int port = 1768;
int debug = 1;
char syncmsg[8];
int sockfd[2];
int gcount = 0;
int ccount = 0;
int id = 0;
pthread_mutex_t game_lock;
List *games;
List *threads;
Quene clients;
static void
error(const char *msg)
{
perror(msg);
pthread_exit(NULL);
}
static void
cleanup(int gid)
{
Game *g;
dprint("cleanup(%d)\n", gid);
g = (Game*)lookup(games, gid);
shutdown(g->sockfd[0], SHUT_RDWR);
shutdown(g->sockfd[1], SHUT_RDWR);
close(g->sockfd[0]);
close(g->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:
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, "ERR wall in %d %d\n", x, y);
else if(r == Glenda)
fprint(playersock, "ERR glenda in %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);
else if(domove(d) == Wall)
fprint(playersock, "ERR glenda %s %d %d\n", s, p.x, p.y);
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, "ERR you can't put walls\n");
break;
case 'm':
if(turn % 2 == 0)
fprint(playersock, "you can't move!\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 gid, int player)
{
char *s, c;
int n = 0;
Game *g;
/* sang bozorg */
s = emalloc(1024);
memset(s, 0, 1024);
g = (Game*)lookup(games, gid);
/* we could use local variables, but that not worth the trouble */
while((c = read(g->sockfd[player], s+n, 1) == 1) && n < 1024)
{
/* silently drop CR from CRLF */
if(s[n] == '\r')
s[n] = '\0';
if(s[n] == '\n' || s[n] == '\0')
{
s[n] = '\0';
break;
}
n++;
}
if(!strcmp(s, ""))
dprint("input(%d, %d): got input: %x, %s\n", gid, player, *s, 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 gid)
{
Game *g;
// if(n > sizeof(games) / sizeof(Game))
// sysfatal("loadgame(%d): invalid game", n);
dprint("loadgame(%d)\n", gid);
g = (Game*)lookup(games, gid);
id = g->id;
difficulty = g->difficulty;
state = g->state;
turn = g->turn;
strncpy(syncmsg, g->syncmsg, 8);
sockfd[0] = g->sockfd[0];
sockfd[1] = g->sockfd[1];
memcpy(grid, g->grid, sizeof(grid));
}
static void
setgame(int gid)
{
Game *g;
// if(n > lllen(games))
// sysfatal("setgame(%d): invalid game", n);
dprint("loadgame(%d)\n", gid);
g = (Game*)lookup(games, gid);
/* id got to change when we set game */
id = gid;
g->id = gid;
g->difficulty = difficulty;
g->state = state;
g->turn = turn;
g->sockfd[0] = sockfd[0];
g->sockfd[1] = sockfd[1];
memcpy(g->grid, grid, sizeof(grid));
}
/* player is either 0 or 1, trapper or glenda */
static void
clienthandler(void *data)
{
int res, gid, player;
char *s;
Game *g;
gid = ((int*)data)[0];
player = ((int*)data)[1];
dprint("clienthandler({%d, %d})\n", gid, player);
g = (Game*)lookup(games, gid);
for(;;)
{
/* most of time is spent here */
s = input(gid, player);
if(!strcmp(s, ""))
{
cleanup(gid);
break;
}
pthread_mutex_lock(&game_lock);
loadgame(gid);
res = proc(player, s);
setgame(gid);
pthread_mutex_unlock(&game_lock);
free(s);
}
}
static void
play(Client *c1, Client *c2)
{
int res[2];
int *tdata[2];
Game *g;
tdata[0] = (int*)emalloc(2 * sizeof(int));
tdata[1] = (int*)emalloc(2 * sizeof(int));
pthread_mutex_lock(&game_lock);
gcount++;
sockfd[0] = c1->fd;
sockfd[1] = c2->fd;
g = (Game*)emalloc(sizeof(Game));
llappend(games, g);
initlevel();
setgame(gcount);
if(debug)
drawlevel();
fprint(g->sockfd[0], "CONN %d %s\n", 0, c2->nick);
fprint(g->sockfd[1], "CONN %d %s\n", 1, c1->nick);
sendlevel();
tdata[0][0] = gcount;
tdata[0][1] = 0;
tdata[1][0] = gcount;
tdata[1][1] = 1;
c1->thread = (pthread_t*)emalloc(sizeof(pthread_t));
c2->thread = (pthread_t*)emalloc(sizeof(pthread_t));
llappend(threads, c1->thread);
llappend(threads, c2->thread);
pthread_mutex_unlock(&game_lock);
res[0] = pthread_create(c1->thread, nil, (void*)clienthandler, (void*)tdata[0]);
res[1] = pthread_create(c2->thread, nil, (void*)clienthandler, (void*)tdata[1]);
dprint("play(): tdata[0] {%d, %d}\n", tdata[0][0], tdata[0][1]);
dprint("play(): tdata[1] {%d, %d}\n", tdata[1][0], tdata[1][1]);
if(res[0] || res[1])
sysfatal("pthread_create() failed: %d\n", res[0] ? res[0] : res[1]);
dprint("play(): threads for game %d are created\n", gcount);
}
char*
parsenick(int fd, char *nick)
{
char *s;
int len = strlen(nick);
if(len > 8)
{
fprint(fd, "DIE nick too long: %d\n", len);
goto die;
}
for(int i = 0 ; len > i ; i++)
{
if(!isalnum(nick[i]))
{
fprint(fd, "DIE nicks must be only alpha numeric strings\n");
goto die;
}
}
s = strdup(nick);
return s;
die:
close(fd);
return nil;
}
int
parsegame(int fd, char *game)
{
int g;
g = atoi(game);
if(g == 0)
return g;
die:
fprint(fd, "DIE invalid game: %d", g);
close(fd);
return -1;
}
int
parseside(int fd, char *side)
{
int s;
s = atoi(side);
if(s == PGlenda || s == PTrapper || s == PRandom)
return s;
die:
fprint(fd, "DIE invalid side: %d", s);
close(fd);
return -1;
}
int
parseopts(int fd, char *opts)
{
return atoi(opts);
}
Client*
newclient(char *in, int fd)
{
Client *c;
char *nick, *side, *game, *opts;
nick = strtok(in, " ");
game = strtok(nil, " ");
side = strtok(nil, " ");
opts = strtok(nil, " ");
dprint("newclient(%d): nick: %s, side: %s, game: %s, opts: %s\n", fd, nick, side, game, opts);
if(nick == nil || side == nil || game == nil)
return nil;
c = (Client*)emalloc(sizeof(Client));
c->fd = fd;
c->nick = parsenick(fd, nick);
c->game = parsegame(fd, game);
c->side = parseside(fd, side);
c->opts = parseopts(fd, opts);
if(c->nick == nil || c->game == -1 || c->side == -1)
{
free(c);
close(fd);
return nil;
}
ccount++;
return c;
}
void
makematch(Client *c)
{
Client *head;
pthread_mutex_lock(&game_lock);
if(clients.l == nil)
clients.l = llnew();
head = clients.l->data;
if(head == nil || c->side == head->side)
{
if(c->side == PRandom)
c->side = nrand(1) ? PTrapper : PGlenda;
qadd(&clients, c);
pthread_mutex_unlock(&game_lock);
fprint(c->fd, "WAIT\n");
}
else
{
if(c->side == PRandom)
c->side = (head->side == PGlenda) ? PTrapper : PGlenda;
qnext(&clients);
pthread_mutex_unlock(&game_lock);
if(c->side == PTrapper)
play(c, head);
else
play(head, c);
}
}
void
registerclient(void *clientfd)
{
char c, *s;
Client *cl;
int n = 0;
int fd = *(int*)clientfd;
dprint("registerclient(%d)\n", fd);
/* sang bozorg */
s = emalloc(1024);
memset(s, 0, 1024);
/* we could use local variables, but that not worth the trouble */
while((c = read(fd, s+n, 1) == 1) && n < 1024)
{
/* silently drop CR from CRLF */
if(s[n] == '\r')
s[n] = '\0';
else if(s[n] == '\n' || s[n] == '\0')
{
s[n] = '\0';
break;
}
n++;
}
if(!strcmp(s, ""))
{
dprint("registerclient(%d): got empty string\n", fd);
fprint(fd, "DIE empty string\n");
close(fd);
goto die;
}
dprint("registerclient(%d): got input: %x, %s\n", fd, *s, s);
cl = newclient(s, fd);
if(cl != nil)
makematch(cl);
die:
free(s);
}
void
srv(int listenfd)
{
int *clientfd;
socklen_t clilen;
struct sockaddr_in servaddr, clientaddr;
pthread_t t;
for(;;)
{
listen(listenfd, 64);
memset(&clientaddr, 0, sizeof(clientaddr));
clilen = sizeof(clientaddr);
clientfd = (int*)emalloc(sizeof(int));
*clientfd = accept(listenfd, (struct sockaddr *) &clientaddr, &clilen);
if(*clientfd < 0)
error("srv(): failed to accept connection");
dprint("game %d: srv(): client %d connected, fd: %d\n", gcount, ccount, *clientfd);
pthread_create(&t, NULL, (void*)registerclient, (void*)clientfd);
}
}
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));
games = llnew();
clients.l = llnew();
threads = llnew();
srv(listenfd);
close(listenfd);
pthread_mutex_destroy(&game_lock);
pthread_exit(NULL);
return 0;
}