1 /* $OpenBSD: hack.unix.c,v 1.19 2016/03/15 19:56:20 mestre 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/stat.h> 76 77 #include <err.h> 78 #include <errno.h> 79 #include <limits.h> 80 #include <signal.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <unistd.h> 84 85 #include "hack.h" 86 87 88 static struct tm *getlt(void); 89 static int veryold(int); 90 #ifdef MAIL 91 static void newmail(void); 92 static void mdrush(struct monst *, boolean); 93 #endif 94 95 static struct tm * 96 getlt(void) 97 { 98 time_t date; 99 struct tm *localtime(); 100 101 (void) time(&date); 102 return(localtime(&date)); 103 } 104 105 int 106 getyear(void) 107 { 108 return(1900 + getlt()->tm_year); 109 } 110 111 char * 112 getdate(void) 113 { 114 static char datestr[7]; 115 struct tm *lt = getlt(); 116 117 (void) snprintf(datestr, sizeof(datestr), "%02d%02d%02d", 118 lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday); 119 return(datestr); 120 } 121 122 /* 123 * 0-7, with 0: new, 4: full 124 * moon period: 29.5306 days 125 * year: 365.2422 days 126 */ 127 int 128 phase_of_the_moon(void) 129 { 130 struct tm *lt = getlt(); 131 int epact, diy, golden; 132 133 diy = lt->tm_yday; 134 golden = (lt->tm_year % 19) + 1; 135 epact = (11 * golden + 18) % 30; 136 if ((epact == 25 && golden > 11) || epact == 24) 137 epact++; 138 139 return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 ); 140 } 141 142 int 143 night(void) 144 { 145 int hour = getlt()->tm_hour; 146 147 return(hour < 6 || hour > 21); 148 } 149 150 int 151 midnight(void) 152 { 153 return(getlt()->tm_hour == 0); 154 } 155 156 struct stat buf, hbuf; 157 158 void 159 gethdate(char *name) 160 { 161 char *p, *np, *path; 162 char filename[PATH_MAX+1]; 163 164 if (strchr(name, '/') != NULL || (p = getenv("PATH")) == NULL) 165 p = ""; 166 np = path = strdup(p); /* Make a copy for strsep. */ 167 if (path == NULL) 168 err(1, NULL); 169 170 for (;;) { 171 if ((p = strsep(&np, ":")) == NULL) 172 break; 173 if (*p == '\0') /* :: */ 174 (void) strlcpy(filename, name, sizeof filename); 175 else 176 (void) snprintf(filename, sizeof filename, 177 "%s/%s", p, name); 178 179 if (stat(filename, &hbuf) == 0) { 180 free(path); 181 return; 182 } 183 } 184 error("Cannot get status of %s.", 185 (p = strrchr(name, '/')) ? p+1 : name); 186 free(path); 187 } 188 189 int 190 uptodate(int fd) 191 { 192 if(fstat(fd, &buf)) { 193 pline("Cannot get status of saved level? "); 194 return(0); 195 } 196 if(buf.st_mtime < hbuf.st_mtime) { 197 pline("Saved level is out of date. "); 198 return(0); 199 } 200 return(1); 201 } 202 203 /* see whether we should throw away this xlock file */ 204 static int 205 veryold(int fd) 206 { 207 int i; 208 time_t date; 209 210 if(fstat(fd, &buf)) return(0); /* cannot get status */ 211 if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */ 212 (void) time(&date); 213 if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */ 214 int lockedpid; /* should be the same size as hackpid */ 215 216 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) != 217 sizeof(lockedpid)) 218 /* strange ... */ 219 return(0); 220 221 /* From: Rick Adams <seismo!rick> 222 This will work on 4.1cbsd, 4.2bsd and system 3? & 5. 223 It will do nothing on V7 or 4.1bsd. */ 224 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 225 return(0); 226 } 227 (void) close(fd); 228 for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 229 glo(i); 230 (void) unlink(lock); 231 } 232 glo(0); 233 if(unlink(lock)) return(0); /* cannot remove it */ 234 return(1); /* success! */ 235 } 236 237 void 238 getlock(void) 239 { 240 extern int hackpid, locknum; 241 int i = 0, fd; 242 243 (void) fflush(stdout); 244 245 /* we ignore QUIT and INT at this point */ 246 if (link(HLOCK, LLOCK) == -1) { 247 int errnosv = errno; 248 249 perror(HLOCK); 250 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 251 switch(errnosv) { 252 case ENOENT: 253 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 254 break; 255 case EACCES: 256 printf("It seems you don't have write permission here.\n"); 257 break; 258 case EEXIST: 259 printf("(Try again or rm %s.)\n", LLOCK); 260 break; 261 default: 262 printf("I don't know what is wrong."); 263 } 264 getret(); 265 error(""); 266 } 267 268 regularize(lock); 269 glo(0); 270 if(locknum > 25) locknum = 25; 271 272 do { 273 if(locknum) lock[0] = 'a' + i++; 274 275 if((fd = open(lock, O_RDONLY)) == -1) { 276 if(errno == ENOENT) goto gotlock; /* no such file */ 277 perror(lock); 278 (void) unlink(LLOCK); 279 error("Cannot open %s", lock); 280 } 281 282 if(veryold(fd)) /* if true, this closes fd and unlinks lock */ 283 goto gotlock; 284 (void) close(fd); 285 } while(i < locknum); 286 287 (void) unlink(LLOCK); 288 error(locknum ? "Too many hacks running now." 289 : "There is a game in progress under your name."); 290 gotlock: 291 fd = open(lock, O_CREAT | O_TRUNC | O_WRONLY, FMASK); 292 if(unlink(LLOCK) == -1) 293 error("Cannot unlink %s.", LLOCK); 294 if(fd == -1) { 295 error("cannot creat lock file."); 296 } else { 297 if(write(fd, (char *) &hackpid, sizeof(hackpid)) 298 != sizeof(hackpid)){ 299 error("cannot write lock"); 300 } 301 if(close(fd) == -1) { 302 error("cannot close lock"); 303 } 304 } 305 } 306 307 #ifdef MAIL 308 309 /* 310 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 311 * I don't know the details of his implementation.] 312 * { Later note: he disliked my calling a general mailreader and felt that 313 * hack should do the paging itself. But when I get mail, I want to put it 314 * in some folder, reply, etc. - it would be unreasonable to put all these 315 * functions in hack. } 316 * The mail daemon '2' is at present not a real monster, but only a visual 317 * effect. Thus, makemon() is superfluous. This might become otherwise, 318 * however. The motion of '2' is less restrained than usual: diagonal moves 319 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 320 * in a ROOM, even when you are Blind. 321 * Its path should be longer when you are Telepat-hic and Blind. 322 * 323 * Interesting side effects: 324 * - You can get rich by sending yourself a lot of mail and selling 325 * it to the shopkeeper. Unfortunately mail isn't very valuable. 326 * - You might die in case '2' comes along at a critical moment during 327 * a fight and delivers a scroll the weight of which causes you to 328 * collapse. 329 * 330 * Possible extensions: 331 * - Open the file MAIL and do fstat instead of stat for efficiency. 332 * (But sh uses stat, so this cannot be too bad.) 333 * - Examine the mail and produce a scroll of mail called "From somebody". 334 * - Invoke MAILREADER in such a way that only this single letter is read. 335 * 336 * - Make him lose his mail when a Nymph steals the letter. 337 * - Do something to the text when the scroll is enchanted or cancelled. 338 */ 339 static struct stat omstat,nmstat; 340 static char *mailbox; 341 static long laststattime; 342 343 void 344 getmailstatus(void) 345 { 346 if(!(mailbox = getenv("MAIL"))) 347 return; 348 if(stat(mailbox, &omstat)){ 349 #ifdef PERMANENT_MAILBOX 350 pline("Cannot get status of MAIL=%s .", mailbox); 351 mailbox = 0; 352 #else 353 omstat.st_mtime = 0; 354 #endif /* PERMANENT_MAILBOX */ 355 } 356 } 357 358 void 359 ckmailstatus(void) 360 { 361 if(!mailbox 362 #ifdef MAILCKFREQ 363 || moves < laststattime + MAILCKFREQ 364 #endif /* MAILCKFREQ */ 365 ) 366 return; 367 laststattime = moves; 368 if(stat(mailbox, &nmstat)){ 369 #ifdef PERMANENT_MAILBOX 370 pline("Cannot get status of MAIL=%s anymore.", mailbox); 371 mailbox = 0; 372 #else 373 nmstat.st_mtime = 0; 374 #endif /* PERMANENT_MAILBOX */ 375 } else if(nmstat.st_mtime > omstat.st_mtime) { 376 if(nmstat.st_size) 377 newmail(); 378 getmailstatus(); /* might be too late ... */ 379 } 380 } 381 382 static void 383 newmail(void) 384 { 385 /* produce a scroll of mail */ 386 struct obj *obj; 387 struct monst *md; 388 extern char plname[]; 389 extern struct obj *mksobj(); 390 extern struct monst *makemon(); 391 extern struct permonst pm_mail_daemon; 392 393 obj = mksobj(SCR_MAIL); 394 if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 395 mdrush(md,0); 396 397 pline("\"Hello, %s! I have some mail for you.\"", plname); 398 if(md) { 399 if(dist(md->mx,md->my) > 2) 400 pline("\"Catch!\""); 401 more(); 402 403 /* let him disappear again */ 404 mdrush(md,1); 405 mondead(md); 406 } 407 408 obj = addinv(obj); 409 (void) identify(obj); /* set known and do prinv() */ 410 } 411 412 /* make md run through the cave */ 413 static void 414 mdrush(struct monst *md, boolean away) 415 { 416 int uroom = inroom(u.ux, u.uy); 417 if(uroom >= 0) { 418 int tmp = rooms[uroom].fdoor; 419 int cnt = rooms[uroom].doorct; 420 int fx = u.ux, fy = u.uy; 421 while(cnt--) { 422 if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ 423 fx = doors[tmp].x; 424 fy = doors[tmp].y; 425 } 426 tmp++; 427 } 428 tmp_at(-1, md->data->mlet); /* open call */ 429 if(away) { /* interchange origin and destination */ 430 unpmon(md); 431 tmp = fx; fx = md->mx; md->mx = tmp; 432 tmp = fy; fy = md->my; md->my = tmp; 433 } 434 while(fx != md->mx || fy != md->my) { 435 int dx,dy,nfx = fx,nfy = fy,d1,d2; 436 437 tmp_at(fx,fy); 438 d1 = DIST(fx,fy,md->mx,md->my); 439 for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 440 if(dx || dy) { 441 d2 = DIST(fx+dx,fy+dy,md->mx,md->my); 442 if(d2 < d1) { 443 d1 = d2; 444 nfx = fx+dx; 445 nfy = fy+dy; 446 } 447 } 448 if(nfx != fx || nfy != fy) { 449 fx = nfx; 450 fy = nfy; 451 } else { 452 if(!away) { 453 md->mx = fx; 454 md->my = fy; 455 } 456 break; 457 } 458 } 459 tmp_at(-1,-1); /* close call */ 460 } 461 if(!away) 462 pmon(md); 463 } 464 465 void 466 readmail(void) 467 { 468 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 469 char *mr = 0; 470 more(); 471 if(!(mr = getenv("MAILREADER"))) 472 mr = DEF_MAILREADER; 473 if(child(1)){ 474 execl(mr, mr, (char *)NULL); 475 exit(1); 476 } 477 #else /* DEF_MAILREADER */ 478 (void) page_file(mailbox, FALSE); 479 #endif /* DEF_MAILREADER */ 480 /* get new stat; not entirely correct: there is a small time 481 window where we do not see new mail */ 482 getmailstatus(); 483 } 484 #endif /* MAIL */ 485 486 /* normalize file name - we don't like ..'s or /'s */ 487 void 488 regularize(char *s) 489 { 490 char *lp; 491 492 while((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) 493 *lp = '_'; 494 } 495