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      1 /*	$NetBSD: hack.unix.c,v 1.18 2019/02/03 10:48:46 mrg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
      5  * Amsterdam
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions are
     10  * met:
     11  *
     12  * - Redistributions of source code must retain the above copyright notice,
     13  * this list of conditions and the following disclaimer.
     14  *
     15  * - Redistributions in binary form must reproduce the above copyright
     16  * notice, this list of conditions and the following disclaimer in the
     17  * documentation and/or other materials provided with the distribution.
     18  *
     19  * - Neither the name of the Stichting Centrum voor Wiskunde en
     20  * Informatica, nor the names of its contributors may be used to endorse or
     21  * promote products derived from this software without specific prior
     22  * written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
     25  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     26  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
     27  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     28  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     31  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     33  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     34  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     35  */
     36 
     37 /*
     38  * Copyright (c) 1982 Jay Fenlason <hack (at) gnu.org>
     39  * All rights reserved.
     40  *
     41  * Redistribution and use in source and binary forms, with or without
     42  * modification, are permitted provided that the following conditions
     43  * are met:
     44  * 1. Redistributions of source code must retain the above copyright
     45  *    notice, this list of conditions and the following disclaimer.
     46  * 2. Redistributions in binary form must reproduce the above copyright
     47  *    notice, this list of conditions and the following disclaimer in the
     48  *    documentation and/or other materials provided with the distribution.
     49  * 3. The name of the author may not be used to endorse or promote products
     50  *    derived from this software without specific prior written permission.
     51  *
     52  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
     53  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
     54  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
     55  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     56  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     57  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     58  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     59  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     60  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     61  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     62  */
     63 
     64 #include <sys/cdefs.h>
     65 #ifndef lint
     66 __RCSID("$NetBSD: hack.unix.c,v 1.18 2019/02/03 10:48:46 mrg Exp $");
     67 #endif				/* not lint */
     68 
     69 /* This file collects some Unix dependencies; hack.pager.c contains some more */
     70 
     71 /*
     72  * The time is used for:
     73  *	- seed for random()
     74  *	- year on tombstone and yymmdd in record file
     75  *	- phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
     76  *	- night and midnight (the undead are dangerous at midnight)
     77  *	- determination of what files are "very old"
     78  */
     79 
     80 #include <errno.h>
     81 #include <sys/types.h>	/* for time_t and stat */
     82 #include <sys/stat.h>
     83 #ifdef BSD
     84 #include <sys/time.h>
     85 #else
     86 #include <time.h>
     87 #endif	/* BSD */
     88 #include <stdlib.h>
     89 #include <unistd.h>
     90 #include <signal.h>
     91 #include <fcntl.h>
     92 
     93 #include "hack.h"		/* mainly for strchr() which depends on BSD */
     94 #include "extern.h"
     95 
     96 extern int locknum;
     97 
     98 static struct tm *getlt(void);
     99 static int veryold(int);
    100 
    101 
    102 void
    103 setrandom(void)
    104 {
    105 	(void) srandom((int) time((time_t *) 0));
    106 }
    107 
    108 static struct tm *
    109 getlt(void)
    110 {
    111 	time_t          date;
    112 
    113 	(void) time(&date);
    114 	return (localtime(&date));
    115 }
    116 
    117 int
    118 getyear(void)
    119 {
    120 	return (1900 + getlt()->tm_year);
    121 }
    122 
    123 char           *
    124 getdatestr(void)
    125 {
    126 	static char     datestr[32];
    127 	struct tm      *lt = getlt();
    128 
    129 	(void) snprintf(datestr, sizeof(datestr), "%02d%02d%02d",
    130 		       lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
    131 	return (datestr);
    132 }
    133 
    134 int
    135 phase_of_the_moon(void)
    136 {				/* 0-7, with 0: new, 4: full *//* moon
    137 				 * period: 29.5306 days */
    138 	/* year: 365.2422 days */
    139 	struct tm      *lt = getlt();
    140 	int             epact, diy, golden;
    141 
    142 	diy = lt->tm_yday;
    143 	golden = (lt->tm_year % 19) + 1;
    144 	epact = (11 * golden + 18) % 30;
    145 	if ((epact == 25 && golden > 11) || epact == 24)
    146 		epact++;
    147 
    148 	return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7);
    149 }
    150 
    151 int
    152 night(void)
    153 {
    154 	int             hour = getlt()->tm_hour;
    155 
    156 	return (hour < 6 || hour > 21);
    157 }
    158 
    159 int
    160 midnight(void)
    161 {
    162 	return (getlt()->tm_hour == 0);
    163 }
    164 
    165 static struct stat buf, hbuf;
    166 
    167 void
    168 gethdate(char *name)
    169 {
    170 #if 0
    171 	/* old version - for people short of space */
    172 
    173 	char *np;
    174 
    175 	if(stat(name, &hbuf))
    176 	    error("Cannot get status of %s.",
    177 		(np = strrchr(name, '/')) ? np+1 : name);
    178 #else
    179 	/* version using PATH from: seismo!gregc (at) ucsf-cgl.ARPA (Greg Couch) */
    180 
    181 
    182 	/*
    183 	 * The problem with   #include	<sys/param.h>   is that this include file
    184 	 * does not exist on all systems, and moreover, that it sometimes includes
    185 	 * <sys/types.h> again, so that the compiler sees these typedefs twice.
    186 	 */
    187 #define		MAXPATHLEN	1024
    188 
    189 	const char           *np, *path;
    190 	char            filename[MAXPATHLEN + 1];
    191 	if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL)
    192 		path = "";
    193 
    194 	for (;;) {
    195 		if ((np = strchr(path, ':')) == NULL)
    196 			np = path + strlen(path);	/* point to end str */
    197 		if (np - path <= 1)	/* %% */
    198 			(void) strlcpy(filename, name, sizeof(filename));
    199 		else {
    200 			(void) snprintf(filename, sizeof(filename),
    201 				"%.*s/%s",
    202 				(int)(np - path), path, name);
    203 		}
    204 		if (stat(filename, &hbuf) == 0)
    205 			return;
    206 		if (*np == '\0')
    207 			break;
    208 		path = np + 1;
    209 	}
    210 	error("Cannot get status of %s.",
    211 	      (np = strrchr(name, '/')) ? np + 1 : name);
    212 #endif
    213 }
    214 
    215 int
    216 uptodate(int fd)
    217 {
    218 	if (fstat(fd, &buf)) {
    219 		pline("Cannot get status of saved level? ");
    220 		return (0);
    221 	}
    222 	if (buf.st_mtime < hbuf.st_mtime) {
    223 		pline("Saved level is out of date. ");
    224 		return (0);
    225 	}
    226 	return (1);
    227 }
    228 
    229 /* see whether we should throw away this xlock file */
    230 static int
    231 veryold(int fd)
    232 {
    233 	int             i;
    234 	time_t          date;
    235 
    236 	if (fstat(fd, &buf))
    237 		return (0);	/* cannot get status */
    238 	if (buf.st_size != sizeof(int))
    239 		return (0);	/* not an xlock file */
    240 	(void) time(&date);
    241 	if (date - buf.st_mtime < 3L * 24L * 60L * 60L) {	/* recent */
    242 		int             lockedpid;	/* should be the same size as
    243 						 * hackpid */
    244 
    245 		if (read(fd, &lockedpid, sizeof(lockedpid)) !=
    246 		    sizeof(lockedpid))
    247 			/* strange ... */
    248 			return (0);
    249 
    250 		/*
    251 		 * From: Rick Adams <seismo!rick> This will work on
    252 		 * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing
    253 		 * on V7 or 4.1bsd.
    254 		 */
    255 		if (!(kill(lockedpid, 0) == -1 && errno == ESRCH))
    256 			return (0);
    257 	}
    258 	(void) close(fd);
    259 	for (i = 1; i <= MAXLEVEL; i++) {	/* try to remove all */
    260 		glo(i);
    261 		(void) unlink(lock);
    262 	}
    263 	glo(0);
    264 	if (unlink(lock))
    265 		return (0);	/* cannot remove it */
    266 	return (1);		/* success! */
    267 }
    268 
    269 void
    270 getlock(void)
    271 {
    272 	int             i = 0, fd;
    273 
    274 	(void) fflush(stdout);
    275 
    276 	/* we ignore QUIT and INT at this point */
    277 	if (link(HLOCK, LLOCK) == -1) {
    278 		int             errnosv = errno;
    279 
    280 		perror(HLOCK);
    281 		printf("Cannot link %s to %s\n", LLOCK, HLOCK);
    282 		switch (errnosv) {
    283 		case ENOENT:
    284 			printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
    285 			break;
    286 		case EACCES:
    287 			printf("It seems you don't have write permission here.\n");
    288 			break;
    289 		case EEXIST:
    290 			printf("(Try again or rm %s.)\n", LLOCK);
    291 			break;
    292 		default:
    293 			printf("I don't know what is wrong.");
    294 		}
    295 		getret();
    296 		error("%s", "");
    297 		/* NOTREACHED */
    298 	}
    299 	regularize(lock);
    300 	glo(0);
    301 	if (locknum > 25)
    302 		locknum = 25;
    303 
    304 	do {
    305 		if (locknum)
    306 			lock[0] = 'a' + i++;
    307 
    308 		if ((fd = open(lock, O_RDONLY)) == -1) {
    309 			if (errno == ENOENT)
    310 				goto gotlock;	/* no such file */
    311 			perror(lock);
    312 			(void) unlink(LLOCK);
    313 			error("Cannot open %s", lock);
    314 		}
    315 		if (veryold(fd))/* if true, this closes fd and unlinks lock */
    316 			goto gotlock;
    317 		(void) close(fd);
    318 	} while (i < locknum);
    319 
    320 	(void) unlink(LLOCK);
    321 	error(locknum ? "Too many hacks running now."
    322 	      : "There is a game in progress under your name.");
    323 gotlock:
    324 	fd = creat(lock, FMASK);
    325 	if (unlink(LLOCK) == -1)
    326 		error("Cannot unlink %s.", LLOCK);
    327 	if (fd == -1) {
    328 		error("cannot creat lock file.");
    329 	} else {
    330 		if (write(fd, &hackpid, sizeof(hackpid))
    331 		    != sizeof(hackpid)) {
    332 			error("cannot write lock");
    333 		}
    334 		if (close(fd) == -1) {
    335 			error("cannot close lock");
    336 		}
    337 	}
    338 }
    339 
    340 #ifdef MAIL
    341 
    342 /*
    343  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
    344  * I don't know the details of his implementation.]
    345  * { Later note: he disliked my calling a general mailreader and felt that
    346  *   hack should do the paging itself. But when I get mail, I want to put it
    347  *   in some folder, reply, etc. - it would be unreasonable to put all these
    348  *   functions in hack. }
    349  * The mail daemon '2' is at present not a real monster, but only a visual
    350  * effect. Thus, makemon() is superfluous. This might become otherwise,
    351  * however. The motion of '2' is less restrained than usual: diagonal moves
    352  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
    353  * in a ROOM, even when you are Blind.
    354  * Its path should be longer when you are Telepat-hic and Blind.
    355  *
    356  * Interesting side effects:
    357  *	- You can get rich by sending yourself a lot of mail and selling
    358  *	  it to the shopkeeper. Unfortunately mail isn't very valuable.
    359  *	- You might die in case '2' comes along at a critical moment during
    360  *	  a fight and delivers a scroll the weight of which causes you to
    361  *	  collapse.
    362  *
    363  * Possible extensions:
    364  *	- Open the file MAIL and do fstat instead of stat for efficiency.
    365  *	  (But sh uses stat, so this cannot be too bad.)
    366  *	- Examine the mail and produce a scroll of mail called "From somebody".
    367  *	- Invoke MAILREADER in such a way that only this single letter is read.
    368  *
    369  *	- Make him lose his mail when a Nymph steals the letter.
    370  *	- Do something to the text when the scroll is enchanted or cancelled.
    371  */
    372 #include	"def.mkroom.h"
    373 static struct stat omstat, nmstat;
    374 static char    *mailbox;
    375 static long     laststattime;
    376 
    377 void
    378 getmailstatus(void)
    379 {
    380 	if (!(mailbox = getenv("MAIL")))
    381 		return;
    382 	if (stat(mailbox, &omstat)) {
    383 #ifdef PERMANENT_MAILBOX
    384 		pline("Cannot get status of MAIL=%s .", mailbox);
    385 		mailbox = 0;
    386 #else
    387 		omstat.st_mtime = 0;
    388 #endif	/* PERMANENT_MAILBOX */
    389 	}
    390 }
    391 
    392 void
    393 ckmailstatus(void)
    394 {
    395 	if (!mailbox
    396 #ifdef MAILCKFREQ
    397 	    || moves < laststattime + MAILCKFREQ
    398 #endif	/* MAILCKFREQ */
    399 		)
    400 		return;
    401 	laststattime = moves;
    402 	if (stat(mailbox, &nmstat)) {
    403 #ifdef PERMANENT_MAILBOX
    404 		pline("Cannot get status of MAIL=%s anymore.", mailbox);
    405 		mailbox = 0;
    406 #else
    407 		nmstat.st_mtime = 0;
    408 #endif	/* PERMANENT_MAILBOX */
    409 	} else if (nmstat.st_mtime > omstat.st_mtime) {
    410 		if (nmstat.st_size)
    411 			newmail();
    412 		getmailstatus();/* might be too late ... */
    413 	}
    414 }
    415 
    416 void
    417 newmail(void)
    418 {
    419 	/* produce a scroll of mail */
    420 	struct obj     *obj;
    421 	struct monst   *md;
    422 
    423 	obj = mksobj(SCR_MAIL);
    424 	if (md = makemon(&pm_mail_daemon, u.ux, u.uy))	/* always succeeds */
    425 		mdrush(md, 0);
    426 
    427 	pline("\"Hello, %s! I have some mail for you.\"", plname);
    428 	if (md) {
    429 		if (dist(md->mx, md->my) > 2)
    430 			pline("\"Catch!\"");
    431 		more();
    432 
    433 		/* let him disappear again */
    434 		mdrush(md, 1);
    435 		mondead(md);
    436 	}
    437 	obj = addinv(obj);
    438 	(void) identify(obj);	/* set known and do prinv() */
    439 }
    440 
    441 /* make md run through the cave */
    442 void
    443 mdrush(struct monst *md, boolean away)
    444 {
    445 	int             uroom = inroom(u.ux, u.uy);
    446 	if (uroom >= 0) {
    447 		int             tmp = rooms[uroom].fdoor;
    448 		int             cnt = rooms[uroom].doorct;
    449 		int             fx = u.ux, fy = u.uy;
    450 		while (cnt--) {
    451 			if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) {
    452 				fx = doors[tmp].x;
    453 				fy = doors[tmp].y;
    454 			}
    455 			tmp++;
    456 		}
    457 		tmp_at(-1, md->data->mlet);	/* open call */
    458 		if (away) {	/* interchange origin and destination */
    459 			unpmon(md);
    460 			tmp = fx;
    461 			fx = md->mx;
    462 			md->mx = tmp;
    463 			tmp = fy;
    464 			fy = md->my;
    465 			md->my = tmp;
    466 		}
    467 		while (fx != md->mx || fy != md->my) {
    468 			int             dx, dy, nfx = fx, nfy = fy, d1,
    469 			                d2;
    470 
    471 			tmp_at(fx, fy);
    472 			d1 = DIST(fx, fy, md->mx, md->my);
    473 			for (dx = -1; dx <= 1; dx++)
    474 				for (dy = -1; dy <= 1; dy++)
    475 					if (dx || dy) {
    476 						d2 = DIST(fx + dx, fy + dy, md->mx, md->my);
    477 						if (d2 < d1) {
    478 							d1 = d2;
    479 							nfx = fx + dx;
    480 							nfy = fy + dy;
    481 						}
    482 					}
    483 			if (nfx != fx || nfy != fy) {
    484 				fx = nfx;
    485 				fy = nfy;
    486 			} else {
    487 				if (!away) {
    488 					md->mx = fx;
    489 					md->my = fy;
    490 				}
    491 				break;
    492 			}
    493 		}
    494 		tmp_at(-1, -1);	/* close call */
    495 	}
    496 	if (!away)
    497 		pmon(md);
    498 }
    499 
    500 void
    501 readmail(void)
    502 {
    503 #ifdef DEF_MAILREADER		/* This implies that UNIX is defined */
    504 	char           *mr = 0;
    505 	more();
    506 	if (!(mr = getenv("MAILREADER")))
    507 		mr = DEF_MAILREADER;
    508 	if (child(1)) {
    509 		execl(mr, mr, (char *)NULL);
    510 		exit(1);
    511 	}
    512 #else	/* DEF_MAILREADER */
    513 	(void) page_file(mailbox, FALSE);
    514 #endif	/* DEF_MAILREADER */
    515 	/*
    516 	 * get new stat; not entirely correct: there is a small time window
    517 	 * where we do not see new mail
    518 	 */
    519 	getmailstatus();
    520 }
    521 #endif	/* MAIL */
    522 
    523 /*
    524  * normalize file name - we don't like ..'s or /'s
    525  */
    526 void
    527 regularize(char *s)
    528 {
    529 	char           *lp;
    530 
    531 	while ((lp = strchr(s, '.')) || (lp = strchr(s, '/')))
    532 		*lp = '_';
    533 }
    534