1 /* $OpenBSD: hack.unix.c,v 1.14 2009/10/27 23:59:25 deraadt 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@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 /* This file collects some Unix dependencies; hack.pager.c contains some more */ 65 66 /* 67 * The time is used for: 68 * - seed for random() 69 * - year on tombstone and yymmdd in record file 70 * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON) 71 * - night and midnight (the undead are dangerous at midnight) 72 * - determination of what files are "very old" 73 */ 74 75 #include <sys/types.h> /* for time_t and stat */ 76 #include <sys/stat.h> 77 #include <sys/param.h> 78 #include <sys/time.h> 79 80 #include <err.h> 81 #include <errno.h> 82 #include <signal.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <unistd.h> 86 #include "hack.h" 87 88 89 static struct tm *getlt(void); 90 static int veryold(int); 91 #ifdef MAIL 92 static void newmail(void); 93 static void mdrush(struct monst *, boolean); 94 #endif 95 96 static struct tm * 97 getlt() 98 { 99 time_t date; 100 struct tm *localtime(); 101 102 (void) time(&date); 103 return(localtime(&date)); 104 } 105 106 int 107 getyear() 108 { 109 return(1900 + getlt()->tm_year); 110 } 111 112 char * 113 getdate() 114 { 115 static char datestr[7]; 116 struct tm *lt = getlt(); 117 118 (void) snprintf(datestr, sizeof(datestr), "%02d%02d%02d", 119 lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday); 120 return(datestr); 121 } 122 123 int 124 phase_of_the_moon() /* 0-7, with 0: new, 4: full */ 125 { /* moon period: 29.5306 days */ 126 /* year: 365.2422 days */ 127 struct tm *lt = getlt(); 128 int epact, diy, golden; 129 130 diy = lt->tm_yday; 131 golden = (lt->tm_year % 19) + 1; 132 epact = (11 * golden + 18) % 30; 133 if ((epact == 25 && golden > 11) || epact == 24) 134 epact++; 135 136 return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 ); 137 } 138 139 int 140 night() 141 { 142 int hour = getlt()->tm_hour; 143 144 return(hour < 6 || hour > 21); 145 } 146 147 int 148 midnight() 149 { 150 return(getlt()->tm_hour == 0); 151 } 152 153 struct stat buf, hbuf; 154 155 void 156 gethdate(char *name) 157 { 158 char *p, *np, *path; 159 char filename[MAXPATHLEN+1]; 160 161 if (strchr(name, '/') != NULL || (p = getenv("PATH")) == NULL) 162 p = ""; 163 np = path = strdup(p); /* Make a copy for strsep. */ 164 if (path == NULL) 165 err(1, NULL); 166 167 for (;;) { 168 if ((p = strsep(&np, ":")) == NULL) 169 break; 170 if (*p == '\0') /* :: */ 171 (void) strlcpy(filename, name, sizeof filename); 172 else 173 (void) snprintf(filename, sizeof filename, 174 "%s/%s", p, name); 175 176 if (stat(filename, &hbuf) == 0) { 177 free(path); 178 return; 179 } 180 } 181 error("Cannot get status of %s.", 182 (p = strrchr(name, '/')) ? p+1 : name); 183 free(path); 184 } 185 186 int 187 uptodate(int fd) 188 { 189 if(fstat(fd, &buf)) { 190 pline("Cannot get status of saved level? "); 191 return(0); 192 } 193 if(buf.st_mtime < hbuf.st_mtime) { 194 pline("Saved level is out of date. "); 195 return(0); 196 } 197 return(1); 198 } 199 200 /* see whether we should throw away this xlock file */ 201 static int 202 veryold(int fd) 203 { 204 int i; 205 time_t date; 206 207 if(fstat(fd, &buf)) return(0); /* cannot get status */ 208 if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */ 209 (void) time(&date); 210 if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */ 211 int lockedpid; /* should be the same size as hackpid */ 212 213 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) != 214 sizeof(lockedpid)) 215 /* strange ... */ 216 return(0); 217 218 /* From: Rick Adams <seismo!rick> 219 This will work on 4.1cbsd, 4.2bsd and system 3? & 5. 220 It will do nothing on V7 or 4.1bsd. */ 221 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 222 return(0); 223 } 224 (void) close(fd); 225 for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 226 glo(i); 227 (void) unlink(lock); 228 } 229 glo(0); 230 if(unlink(lock)) return(0); /* cannot remove it */ 231 return(1); /* success! */ 232 } 233 234 void 235 getlock() 236 { 237 extern int hackpid, locknum; 238 int i = 0, fd; 239 240 (void) fflush(stdout); 241 242 /* we ignore QUIT and INT at this point */ 243 if (link(HLOCK, LLOCK) == -1) { 244 int errnosv = errno; 245 246 perror(HLOCK); 247 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 248 switch(errnosv) { 249 case ENOENT: 250 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 251 break; 252 case EACCES: 253 printf("It seems you don't have write permission here.\n"); 254 break; 255 case EEXIST: 256 printf("(Try again or rm %s.)\n", LLOCK); 257 break; 258 default: 259 printf("I don't know what is wrong."); 260 } 261 getret(); 262 error(""); 263 /*NOTREACHED*/ 264 } 265 266 regularize(lock); 267 glo(0); 268 if(locknum > 25) locknum = 25; 269 270 do { 271 if(locknum) lock[0] = 'a' + i++; 272 273 if((fd = open(lock, O_RDONLY)) == -1) { 274 if(errno == ENOENT) goto gotlock; /* no such file */ 275 perror(lock); 276 (void) unlink(LLOCK); 277 error("Cannot open %s", lock); 278 } 279 280 if(veryold(fd)) /* if true, this closes fd and unlinks lock */ 281 goto gotlock; 282 (void) close(fd); 283 } while(i < locknum); 284 285 (void) unlink(LLOCK); 286 error(locknum ? "Too many hacks running now." 287 : "There is a game in progress under your name."); 288 gotlock: 289 fd = creat(lock, FMASK); 290 if(unlink(LLOCK) == -1) 291 error("Cannot unlink %s.", LLOCK); 292 if(fd == -1) { 293 error("cannot creat lock file."); 294 } else { 295 if(write(fd, (char *) &hackpid, sizeof(hackpid)) 296 != sizeof(hackpid)){ 297 error("cannot write lock"); 298 } 299 if(close(fd) == -1) { 300 error("cannot close lock"); 301 } 302 } 303 } 304 305 #ifdef MAIL 306 307 /* 308 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 309 * I don't know the details of his implementation.] 310 * { Later note: he disliked my calling a general mailreader and felt that 311 * hack should do the paging itself. But when I get mail, I want to put it 312 * in some folder, reply, etc. - it would be unreasonable to put all these 313 * functions in hack. } 314 * The mail daemon '2' is at present not a real monster, but only a visual 315 * effect. Thus, makemon() is superfluous. This might become otherwise, 316 * however. The motion of '2' is less restrained than usual: diagonal moves 317 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 318 * in a ROOM, even when you are Blind. 319 * Its path should be longer when you are Telepat-hic and Blind. 320 * 321 * Interesting side effects: 322 * - You can get rich by sending yourself a lot of mail and selling 323 * it to the shopkeeper. Unfortunately mail isn't very valuable. 324 * - You might die in case '2' comes along at a critical moment during 325 * a fight and delivers a scroll the weight of which causes you to 326 * collapse. 327 * 328 * Possible extensions: 329 * - Open the file MAIL and do fstat instead of stat for efficiency. 330 * (But sh uses stat, so this cannot be too bad.) 331 * - Examine the mail and produce a scroll of mail called "From somebody". 332 * - Invoke MAILREADER in such a way that only this single letter is read. 333 * 334 * - Make him lose his mail when a Nymph steals the letter. 335 * - Do something to the text when the scroll is enchanted or cancelled. 336 */ 337 static struct stat omstat,nmstat; 338 static char *mailbox; 339 static long laststattime; 340 341 void 342 getmailstatus() 343 { 344 if(!(mailbox = getenv("MAIL"))) 345 return; 346 if(stat(mailbox, &omstat)){ 347 #ifdef PERMANENT_MAILBOX 348 pline("Cannot get status of MAIL=%s .", mailbox); 349 mailbox = 0; 350 #else 351 omstat.st_mtime = 0; 352 #endif /* PERMANENT_MAILBOX */ 353 } 354 } 355 356 void 357 ckmailstatus() 358 { 359 if(!mailbox 360 #ifdef MAILCKFREQ 361 || moves < laststattime + MAILCKFREQ 362 #endif /* MAILCKFREQ */ 363 ) 364 return; 365 laststattime = moves; 366 if(stat(mailbox, &nmstat)){ 367 #ifdef PERMANENT_MAILBOX 368 pline("Cannot get status of MAIL=%s anymore.", mailbox); 369 mailbox = 0; 370 #else 371 nmstat.st_mtime = 0; 372 #endif /* PERMANENT_MAILBOX */ 373 } else if(nmstat.st_mtime > omstat.st_mtime) { 374 if(nmstat.st_size) 375 newmail(); 376 getmailstatus(); /* might be too late ... */ 377 } 378 } 379 380 static void 381 newmail() 382 { 383 /* produce a scroll of mail */ 384 struct obj *obj; 385 struct monst *md; 386 extern char plname[]; 387 extern struct obj *mksobj(); 388 extern struct monst *makemon(); 389 extern struct permonst pm_mail_daemon; 390 391 obj = mksobj(SCR_MAIL); 392 if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 393 mdrush(md,0); 394 395 pline("\"Hello, %s! I have some mail for you.\"", plname); 396 if(md) { 397 if(dist(md->mx,md->my) > 2) 398 pline("\"Catch!\""); 399 more(); 400 401 /* let him disappear again */ 402 mdrush(md,1); 403 mondead(md); 404 } 405 406 obj = addinv(obj); 407 (void) identify(obj); /* set known and do prinv() */ 408 } 409 410 /* make md run through the cave */ 411 static void 412 mdrush(struct monst *md, boolean away) 413 { 414 int uroom = inroom(u.ux, u.uy); 415 if(uroom >= 0) { 416 int tmp = rooms[uroom].fdoor; 417 int cnt = rooms[uroom].doorct; 418 int fx = u.ux, fy = u.uy; 419 while(cnt--) { 420 if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ 421 fx = doors[tmp].x; 422 fy = doors[tmp].y; 423 } 424 tmp++; 425 } 426 tmp_at(-1, md->data->mlet); /* open call */ 427 if(away) { /* interchange origin and destination */ 428 unpmon(md); 429 tmp = fx; fx = md->mx; md->mx = tmp; 430 tmp = fy; fy = md->my; md->my = tmp; 431 } 432 while(fx != md->mx || fy != md->my) { 433 int dx,dy,nfx = fx,nfy = fy,d1,d2; 434 435 tmp_at(fx,fy); 436 d1 = DIST(fx,fy,md->mx,md->my); 437 for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 438 if(dx || dy) { 439 d2 = DIST(fx+dx,fy+dy,md->mx,md->my); 440 if(d2 < d1) { 441 d1 = d2; 442 nfx = fx+dx; 443 nfy = fy+dy; 444 } 445 } 446 if(nfx != fx || nfy != fy) { 447 fx = nfx; 448 fy = nfy; 449 } else { 450 if(!away) { 451 md->mx = fx; 452 md->my = fy; 453 } 454 break; 455 } 456 } 457 tmp_at(-1,-1); /* close call */ 458 } 459 if(!away) 460 pmon(md); 461 } 462 463 void 464 readmail() 465 { 466 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 467 char *mr = 0; 468 more(); 469 if(!(mr = getenv("MAILREADER"))) 470 mr = DEF_MAILREADER; 471 if(child(1)){ 472 execl(mr, mr, (char *) 0); 473 exit(1); 474 } 475 #else /* DEF_MAILREADER */ 476 (void) page_file(mailbox, FALSE); 477 #endif /* DEF_MAILREADER */ 478 /* get new stat; not entirely correct: there is a small time 479 window where we do not see new mail */ 480 getmailstatus(); 481 } 482 #endif /* MAIL */ 483 484 /* normalize file name - we don't like ..'s or /'s */ 485 void 486 regularize(char *s) 487 { 488 char *lp; 489 490 while((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) 491 *lp = '_'; 492 } 493