503 lines
9.8 KiB
C
503 lines
9.8 KiB
C
/* $NetBSD: sync.c,v 1.24 2006/05/18 18:42:59 mrg Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)sync.c 8.2 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: sync.c,v 1.24 2006/05/18 18:42:59 mrg Exp $");
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#endif
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#endif /* not lint */
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "extern.h"
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#include "pathnames.h"
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#define BUFSIZE 4096
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static int sync_update(int, struct ship *, const char *, long, long, long, long);
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static const char SF[] = _PATH_SYNC;
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static const char LF[] = _PATH_LOCK;
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static char sync_buf[BUFSIZE];
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static char *sync_bp = sync_buf;
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static char sync_lock[sizeof SF];
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static char sync_file[sizeof LF];
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static long sync_seek;
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static FILE *sync_fp;
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void
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fmtship(char *buf, size_t len, const char *fmt, struct ship *ship)
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{
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while (*fmt) {
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if (len-- == 0) {
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*buf = '\0';
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return;
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}
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if (*fmt == '$' && fmt[1] == '$') {
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size_t l = snprintf(buf, len, "%s (%c%c)",
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ship->shipname, colours(ship), sterncolour(ship));
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buf += l;
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len -= l - 1;
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fmt += 2;
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}
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else
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*buf++ = *fmt++;
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}
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if (len > 0)
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*buf = '\0';
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}
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/*VARARGS3*/
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void
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makesignal(struct ship *from, const char *fmt, struct ship *ship, ...)
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{
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char message[BUFSIZ];
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char format[BUFSIZ];
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va_list ap;
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va_start(ap, ship);
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fmtship(format, sizeof(format), fmt, ship);
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vsprintf(message, format, ap);
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va_end(ap);
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Writestr(W_SIGNAL, from, message);
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}
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/*VARARGS2*/
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void
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makemsg(struct ship *from, const char *fmt, ...)
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{
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char message[BUFSIZ];
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va_list ap;
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va_start(ap, fmt);
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vsprintf(message, fmt, ap);
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va_end(ap);
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Writestr(W_SIGNAL, from, message);
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}
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int
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sync_exists(int game)
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{
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char buf[sizeof sync_file];
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struct stat s;
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time_t t;
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sprintf(buf, SF, game);
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time(&t);
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setegid(egid);
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if (stat(buf, &s) < 0) {
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setegid(gid);
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return 0;
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}
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if (s.st_mtime < t - 60*60*2) { /* 2 hours */
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unlink(buf);
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sprintf(buf, LF, game);
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unlink(buf);
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setegid(gid);
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return 0;
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} else {
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setegid(gid);
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return 1;
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}
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}
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int
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sync_open(void)
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{
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struct stat tmp;
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if (sync_fp != NULL)
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fclose(sync_fp);
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sprintf(sync_lock, LF, game);
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sprintf(sync_file, SF, game);
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setegid(egid);
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if (stat(sync_file, &tmp) < 0) {
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mode_t omask = umask(002);
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sync_fp = fopen(sync_file, "w+");
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umask(omask);
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} else
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sync_fp = fopen(sync_file, "r+");
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setegid(gid);
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if (sync_fp == NULL)
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return -1;
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sync_seek = 0;
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return 0;
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}
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void
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sync_close(int remove)
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{
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if (sync_fp != 0)
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fclose(sync_fp);
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if (remove) {
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setegid(egid);
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unlink(sync_file);
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setegid(gid);
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}
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}
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void
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Write(int type, struct ship *ship, long a, long b, long c, long d)
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{
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sprintf(sync_bp, "%d %d 0 %ld %ld %ld %ld\n",
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type, ship->file->index, a, b, c, d);
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while (*sync_bp++)
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;
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sync_bp--;
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if (sync_bp >= &sync_buf[sizeof sync_buf])
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abort();
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sync_update(type, ship, NULL, a, b, c, d);
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}
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void
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Writestr(int type, struct ship *ship, const char *a)
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{
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sprintf(sync_bp, "%d %d 1 %s\n", type, ship->file->index, a);
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while (*sync_bp++)
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;
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sync_bp--;
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if (sync_bp >= &sync_buf[sizeof sync_buf])
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abort();
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sync_update(type, ship, a, 0, 0, 0, 0);
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}
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int
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Sync(void)
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{
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sig_t sighup, sigint;
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int n;
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int type, shipnum, isstr;
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char *astr;
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long a, b, c, d;
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char buf[80];
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char erred = 0;
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sighup = signal(SIGHUP, SIG_IGN);
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sigint = signal(SIGINT, SIG_IGN);
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for (n = TIMEOUT; --n >= 0;) {
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#ifdef LOCK_EX
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if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
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break;
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if (errno != EWOULDBLOCK)
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return -1;
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#else
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setegid(egid);
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if (link(sync_file, sync_lock) >= 0) {
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setegid(gid);
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break;
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}
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setegid(gid);
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if (errno != EEXIST)
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return -1;
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#endif
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sleep(1);
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}
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if (n <= 0)
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return -1;
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fseek(sync_fp, sync_seek, SEEK_SET);
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for (;;) {
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switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
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case 3:
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break;
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case EOF:
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goto out;
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default:
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goto bad;
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}
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if (shipnum < 0 || shipnum >= cc->vessels)
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goto bad;
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if (isstr != 0 && isstr != 1)
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goto bad;
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if (isstr) {
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int c;
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char *p;
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for (p = buf;;) {
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c = getc(sync_fp);
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*p++ = (char)c;
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switch (c) {
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case '\n':
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p--;
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case EOF:
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break;
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default:
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if (p >= buf + sizeof buf)
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p--;
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continue;
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}
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break;
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}
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*p = 0;
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for (p = buf; *p == ' '; p++)
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;
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astr = p;
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a = b = c = d = 0;
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} else {
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if (fscanf(sync_fp, "%ld%ld%ld%ld", &a, &b, &c, &d) != 4)
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goto bad;
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astr = NULL;
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}
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if (sync_update(type, SHIP(shipnum), astr, a, b, c, d) < 0)
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goto bad;
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}
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bad:
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erred++;
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out:
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if (!erred && sync_bp != sync_buf) {
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fseek(sync_fp, 0L, SEEK_END);
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fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
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sync_fp);
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fflush(sync_fp);
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sync_bp = sync_buf;
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}
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sync_seek = ftell(sync_fp);
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#ifdef LOCK_EX
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flock(fileno(sync_fp), LOCK_UN);
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#else
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setegid(egid);
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unlink(sync_lock);
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setegid(gid);
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#endif
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signal(SIGHUP, sighup);
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signal(SIGINT, sigint);
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return erred ? -1 : 0;
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}
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static int
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sync_update(int type, struct ship *ship, const char *astr, long a, long b, long c, long d)
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{
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switch (type) {
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case W_DBP: {
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struct BP *p = &ship->file->DBP[a];
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p->turnsent = b;
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p->toship = SHIP(c);
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p->mensent = d;
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break;
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}
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case W_OBP: {
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struct BP *p = &ship->file->OBP[a];
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p->turnsent = b;
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p->toship = SHIP(c);
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p->mensent = d;
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break;
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}
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case W_FOUL: {
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struct snag *p = &ship->file->foul[a];
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if (SHIP(a)->file->dir == 0)
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break;
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if (p->sn_count++ == 0)
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p->sn_turn = turn;
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ship->file->nfoul++;
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break;
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}
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case W_GRAP: {
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struct snag *p = &ship->file->grap[a];
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if (SHIP(a)->file->dir == 0)
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break;
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if (p->sn_count++ == 0)
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p->sn_turn = turn;
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ship->file->ngrap++;
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break;
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}
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case W_UNFOUL: {
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struct snag *p = &ship->file->foul[a];
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if (p->sn_count > 0) {
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if (b) {
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ship->file->nfoul -= p->sn_count;
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p->sn_count = 0;
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} else {
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ship->file->nfoul--;
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p->sn_count--;
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}
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}
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break;
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}
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case W_UNGRAP: {
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struct snag *p = &ship->file->grap[a];
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if (p->sn_count > 0) {
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if (b) {
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ship->file->ngrap -= p->sn_count;
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p->sn_count = 0;
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} else {
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ship->file->ngrap--;
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p->sn_count--;
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}
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}
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break;
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}
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case W_SIGNAL:
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if (mode == MODE_PLAYER) {
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if (nobells)
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Signal("$$: %s", ship, astr);
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else
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Signal("\7$$: %s", ship, astr);
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}
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break;
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case W_CREW: {
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struct shipspecs *s = ship->specs;
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s->crew1 = a;
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s->crew2 = b;
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s->crew3 = c;
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break;
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}
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case W_CAPTAIN:
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strlcpy(ship->file->captain, astr,
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sizeof ship->file->captain);
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break;
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case W_CAPTURED:
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if (a < 0)
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ship->file->captured = 0;
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else
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ship->file->captured = SHIP(a);
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break;
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case W_CLASS:
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ship->specs->class = a;
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break;
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case W_DRIFT:
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ship->file->drift = a;
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break;
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case W_EXPLODE:
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if ((ship->file->explode = a) == 2)
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ship->file->dir = 0;
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break;
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case W_FS:
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ship->file->FS = a;
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break;
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case W_GUNL: {
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struct shipspecs *s = ship->specs;
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s->gunL = a;
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s->carL = b;
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break;
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}
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case W_GUNR: {
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struct shipspecs *s = ship->specs;
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s->gunR = a;
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s->carR = b;
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break;
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}
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case W_HULL:
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ship->specs->hull = a;
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break;
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case W_MOVE:
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strlcpy(ship->file->movebuf, astr,
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sizeof ship->file->movebuf);
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break;
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case W_PCREW:
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ship->file->pcrew = a;
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break;
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case W_POINTS:
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ship->file->points = a;
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break;
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case W_QUAL:
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ship->specs->qual = a;
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break;
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case W_RIGG: {
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struct shipspecs *s = ship->specs;
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s->rig1 = a;
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s->rig2 = b;
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s->rig3 = c;
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s->rig4 = d;
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break;
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}
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case W_RIG1:
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ship->specs->rig1 = a;
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break;
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case W_RIG2:
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ship->specs->rig2 = a;
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break;
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case W_RIG3:
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ship->specs->rig3 = a;
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break;
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case W_RIG4:
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ship->specs->rig4 = a;
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break;
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case W_COL:
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ship->file->col = a;
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break;
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case W_DIR:
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ship->file->dir = a;
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break;
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case W_ROW:
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ship->file->row = a;
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break;
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case W_SINK:
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if ((ship->file->sink = a) == 2)
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ship->file->dir = 0;
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break;
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case W_STRUCK:
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ship->file->struck = a;
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break;
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case W_TA:
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ship->specs->ta = a;
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break;
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case W_ALIVE:
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alive = 1;
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break;
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case W_TURN:
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turn = a;
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break;
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case W_WIND:
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winddir = a;
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windspeed = b;
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break;
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case W_BEGIN:
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strcpy(ship->file->captain, "begin");
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people++;
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break;
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case W_END:
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*ship->file->captain = 0;
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ship->file->points = 0;
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people--;
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break;
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case W_DDEAD:
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hasdriver = 0;
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break;
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default:
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fprintf(stderr, "sync_update: unknown type %d\r\n", type);
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return -1;
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}
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return 0;
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}
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