1 /* $OpenBSD: hack.unix.c,v 1.22 2023/06/03 15:19:38 op 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 <time.h> 84 #include <unistd.h> 85 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(void) 98 { 99 time_t date; 100 struct tm *localtime(); 101 102 (void) time(&date); 103 return(localtime(&date)); 104 } 105 106 int 107 getyear(void) 108 { 109 return(1900 + getlt()->tm_year); 110 } 111 112 char * 113 getdate(void) 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 /* 124 * 0-7, with 0: new, 4: full 125 * moon period: 29.5306 days 126 * year: 365.2422 days 127 */ 128 int 129 phase_of_the_moon(void) 130 { 131 struct tm *lt = getlt(); 132 int epact, diy, golden; 133 134 diy = lt->tm_yday; 135 golden = (lt->tm_year % 19) + 1; 136 epact = (11 * golden + 18) % 30; 137 if ((epact == 25 && golden > 11) || epact == 24) 138 epact++; 139 140 return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 ); 141 } 142 143 int 144 night(void) 145 { 146 int hour = getlt()->tm_hour; 147 148 return(hour < 6 || hour > 21); 149 } 150 151 int 152 midnight(void) 153 { 154 return(getlt()->tm_hour == 0); 155 } 156 157 struct stat buf; 158 159 /* see whether we should throw away this xlock file */ 160 static int 161 veryold(int fd) 162 { 163 int i; 164 time_t date; 165 166 if(fstat(fd, &buf)) return(0); /* cannot get status */ 167 if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */ 168 (void) time(&date); 169 if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */ 170 int lockedpid; /* should be the same size as hackpid */ 171 172 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) != 173 sizeof(lockedpid)) 174 /* strange ... */ 175 return(0); 176 177 /* From: Rick Adams <seismo!rick> 178 This will work on 4.1cbsd, 4.2bsd and system 3? & 5. 179 It will do nothing on V7 or 4.1bsd. */ 180 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 181 return(0); 182 } 183 (void) close(fd); 184 for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 185 glo(i); 186 (void) unlink(lock); 187 } 188 glo(0); 189 if(unlink(lock)) return(0); /* cannot remove it */ 190 return(1); /* success! */ 191 } 192 193 void 194 getlock(void) 195 { 196 extern int hackpid, locknum; 197 int i = 0, fd; 198 199 (void) fflush(stdout); 200 201 /* we ignore QUIT and INT at this point */ 202 if (link(HLOCK, LLOCK) == -1) { 203 int errnosv = errno; 204 205 perror(HLOCK); 206 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 207 switch(errnosv) { 208 case ENOENT: 209 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 210 break; 211 case EACCES: 212 printf("It seems you don't have write permission here.\n"); 213 break; 214 case EEXIST: 215 printf("(Try again or rm %s.)\n", LLOCK); 216 break; 217 default: 218 printf("I don't know what is wrong."); 219 } 220 getret(); 221 error(""); 222 } 223 224 regularize(lock); 225 glo(0); 226 if(locknum > 25) locknum = 25; 227 228 do { 229 if(locknum) lock[0] = 'a' + i++; 230 231 if((fd = open(lock, O_RDONLY)) == -1) { 232 if(errno == ENOENT) goto gotlock; /* no such file */ 233 perror(lock); 234 (void) unlink(LLOCK); 235 error("Cannot open %s", lock); 236 } 237 238 if(veryold(fd)) /* if true, this closes fd and unlinks lock */ 239 goto gotlock; 240 (void) close(fd); 241 } while(i < locknum); 242 243 (void) unlink(LLOCK); 244 error(locknum ? "Too many hacks running now." 245 : "There is a game in progress under your name."); 246 gotlock: 247 fd = open(lock, O_CREAT | O_TRUNC | O_WRONLY, FMASK); 248 if(unlink(LLOCK) == -1) 249 error("Cannot unlink %s.", LLOCK); 250 if(fd == -1) { 251 error("cannot creat lock file."); 252 } else { 253 if(write(fd, (char *) &hackpid, sizeof(hackpid)) 254 != sizeof(hackpid)){ 255 error("cannot write lock"); 256 } 257 if(close(fd) == -1) { 258 error("cannot close lock"); 259 } 260 } 261 } 262 263 #ifdef MAIL 264 265 /* 266 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 267 * I don't know the details of his implementation.] 268 * { Later note: he disliked my calling a general mailreader and felt that 269 * hack should do the paging itself. But when I get mail, I want to put it 270 * in some folder, reply, etc. - it would be unreasonable to put all these 271 * functions in hack. } 272 * The mail daemon '2' is at present not a real monster, but only a visual 273 * effect. Thus, makemon() is superfluous. This might become otherwise, 274 * however. The motion of '2' is less restrained than usual: diagonal moves 275 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 276 * in a ROOM, even when you are Blind. 277 * Its path should be longer when you are Telepat-hic and Blind. 278 * 279 * Interesting side effects: 280 * - You can get rich by sending yourself a lot of mail and selling 281 * it to the shopkeeper. Unfortunately mail isn't very valuable. 282 * - You might die in case '2' comes along at a critical moment during 283 * a fight and delivers a scroll the weight of which causes you to 284 * collapse. 285 * 286 * Possible extensions: 287 * - Open the file MAIL and do fstat instead of stat for efficiency. 288 * (But sh uses stat, so this cannot be too bad.) 289 * - Examine the mail and produce a scroll of mail called "From somebody". 290 * - Invoke MAILREADER in such a way that only this single letter is read. 291 * 292 * - Make him lose his mail when a Nymph steals the letter. 293 * - Do something to the text when the scroll is enchanted or cancelled. 294 */ 295 static struct stat omstat,nmstat; 296 static char *mailbox; 297 static long laststattime; 298 299 void 300 getmailstatus(void) 301 { 302 if(!(mailbox = getenv("MAIL"))) 303 return; 304 if(stat(mailbox, &omstat)){ 305 #ifdef PERMANENT_MAILBOX 306 pline("Cannot get status of MAIL=%s .", mailbox); 307 mailbox = 0; 308 #else 309 omstat.st_mtime = 0; 310 #endif /* PERMANENT_MAILBOX */ 311 } 312 } 313 314 void 315 ckmailstatus(void) 316 { 317 if(!mailbox 318 #ifdef MAILCKFREQ 319 || moves < laststattime + MAILCKFREQ 320 #endif /* MAILCKFREQ */ 321 ) 322 return; 323 laststattime = moves; 324 if(stat(mailbox, &nmstat)){ 325 #ifdef PERMANENT_MAILBOX 326 pline("Cannot get status of MAIL=%s anymore.", mailbox); 327 mailbox = 0; 328 #else 329 nmstat.st_mtime = 0; 330 #endif /* PERMANENT_MAILBOX */ 331 } else if(nmstat.st_mtime > omstat.st_mtime) { 332 if(nmstat.st_size) 333 newmail(); 334 getmailstatus(); /* might be too late ... */ 335 } 336 } 337 338 static void 339 newmail(void) 340 { 341 /* produce a scroll of mail */ 342 struct obj *obj; 343 struct monst *md; 344 extern char plname[]; 345 extern struct obj *mksobj(); 346 extern struct monst *makemon(); 347 extern struct permonst pm_mail_daemon; 348 349 obj = mksobj(SCR_MAIL); 350 if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 351 mdrush(md,0); 352 353 pline("\"Hello, %s! I have some mail for you.\"", plname); 354 if(md) { 355 if(dist(md->mx,md->my) > 2) 356 pline("\"Catch!\""); 357 more(); 358 359 /* let him disappear again */ 360 mdrush(md,1); 361 mondead(md); 362 } 363 364 obj = addinv(obj); 365 (void) identify(obj); /* set known and do prinv() */ 366 } 367 368 /* make md run through the cave */ 369 static void 370 mdrush(struct monst *md, boolean away) 371 { 372 int uroom = inroom(u.ux, u.uy); 373 if(uroom >= 0) { 374 int tmp = rooms[uroom].fdoor; 375 int cnt = rooms[uroom].doorct; 376 int fx = u.ux, fy = u.uy; 377 while(cnt--) { 378 if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ 379 fx = doors[tmp].x; 380 fy = doors[tmp].y; 381 } 382 tmp++; 383 } 384 tmp_at(-1, md->data->mlet); /* open call */ 385 if(away) { /* interchange origin and destination */ 386 unpmon(md); 387 tmp = fx; fx = md->mx; md->mx = tmp; 388 tmp = fy; fy = md->my; md->my = tmp; 389 } 390 while(fx != md->mx || fy != md->my) { 391 int dx,dy,nfx = fx,nfy = fy,d1,d2; 392 393 tmp_at(fx,fy); 394 d1 = DIST(fx,fy,md->mx,md->my); 395 for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 396 if(dx || dy) { 397 d2 = DIST(fx+dx,fy+dy,md->mx,md->my); 398 if(d2 < d1) { 399 d1 = d2; 400 nfx = fx+dx; 401 nfy = fy+dy; 402 } 403 } 404 if(nfx != fx || nfy != fy) { 405 fx = nfx; 406 fy = nfy; 407 } else { 408 if(!away) { 409 md->mx = fx; 410 md->my = fy; 411 } 412 break; 413 } 414 } 415 tmp_at(-1,-1); /* close call */ 416 } 417 if(!away) 418 pmon(md); 419 } 420 421 void 422 readmail(void) 423 { 424 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 425 char *mr = 0; 426 more(); 427 if(!(mr = getenv("MAILREADER"))) 428 mr = DEF_MAILREADER; 429 if(child(1)){ 430 execl(mr, mr, (char *)NULL); 431 exit(1); 432 } 433 #else /* DEF_MAILREADER */ 434 (void) page_file(mailbox, FALSE); 435 #endif /* DEF_MAILREADER */ 436 /* get new stat; not entirely correct: there is a small time 437 window where we do not see new mail */ 438 getmailstatus(); 439 } 440 #endif /* MAIL */ 441 442 /* normalize file name - we don't like ..'s or /'s */ 443 void 444 regularize(char *s) 445 { 446 char *lp; 447 448 while((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) 449 *lp = '_'; 450 } 451