sail/sync.c

   1 /*      $NetBSD: sync.c,v 1.26 2009/03/14 18:32:47 dholland Exp $       */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)sync.c      8.2 (Berkeley) 4/28/95";
  36 #else
  37 __RCSID("$NetBSD: sync.c,v 1.26 2009/03/14 18:32:47 dholland Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/stat.h>
  42
  43 #include <fcntl.h>
  44 #include <errno.h>
  45 #include <signal.h>
  46 #include <stdarg.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <time.h>
  51 #include <unistd.h>
  52 #include "extern.h"
  53 #include "pathnames.h"
  54
  55 #define BUFSIZE 4096
  56
  57 static int      sync_update(int, struct ship *, const char *, long, long, long, long);
  58
  59 static const char SF[] = _PATH_SYNC;
  60 static const char LF[] = _PATH_LOCK;
  61 static char sync_buf[BUFSIZE];
  62 static char *sync_bp = sync_buf;
  63 static char sync_lock[sizeof SF];
  64 static char sync_file[sizeof LF];
  65 static long sync_seek;
  66 static FILE *sync_fp;
  67
  68 void
  69 fmtship(char *buf, size_t len, const char *fmt, struct ship *ship)
  70 {
  71         while (*fmt) {
  72                 if (len-- == 0) {
  73                         *buf = '\0';
  74                         return;
  75                 }
  76                 if (*fmt == '$' && fmt[1] == '$') {
  77                         size_t l = snprintf(buf, len, "%s (%c%c)",
  78                             ship->shipname, colours(ship), sterncolour(ship));
  79                         buf += l;
  80                         len -= l - 1;
  81                         fmt += 2;
  82                 }
  83                 else
  84                         *buf++ = *fmt++;
  85         }
  86
  87         if (len > 0)
  88                 *buf = '\0';
  89 }
  90
  91
  92 /*VARARGS3*/
  93 void
  94 makesignal(struct ship *from, const char *fmt, struct ship *ship, ...)
  95 {
  96         char message[BUFSIZ];
  97         char format[BUFSIZ];
  98         va_list ap;
  99
 100         va_start(ap, ship);
 101         fmtship(format, sizeof(format), fmt, ship);
 102         vsnprintf(message, sizeof(message), format, ap);
 103         va_end(ap);
 104         Writestr(W_SIGNAL, from, message);
 105 }
 106
 107 /*VARARGS2*/
 108 void
 109 makemsg(struct ship *from, const char *fmt, ...)
 110 {
 111         char message[BUFSIZ];
 112         va_list ap;
 113
 114         va_start(ap, fmt);
 115         vsnprintf(message, sizeof(message), fmt, ap);
 116         va_end(ap);
 117         Writestr(W_SIGNAL, from, message);
 118 }
 119
 120 int
 121 sync_exists(int gamenum)
 122 {
 123         char buf[sizeof sync_file];
 124         struct stat s;
 125         time_t t;
 126
 127         snprintf(buf, sizeof(buf), SF, gamenum);
 128         time(&t);
 129         setegid(egid);
 130         if (stat(buf, &s) < 0) {
 131                 setegid(gid);
 132                 return 0;
 133         }
 134         if (s.st_mtime < t - 60*60*2) {         /* 2 hours */
 135                 unlink(buf);
 136                 snprintf(buf, sizeof(buf), LF, gamenum);
 137                 unlink(buf);
 138                 setegid(gid);
 139                 return 0;
 140         } else {
 141                 setegid(gid);
 142                 return 1;
 143         }
 144 }
 145
 146 int
 147 sync_open(void)
 148 {
 149         struct stat tmp;
 150         if (sync_fp != NULL)
 151                 fclose(sync_fp);
 152         snprintf(sync_lock, sizeof(sync_lock), LF, game);
 153         snprintf(sync_file, sizeof(sync_file), SF, game);
 154         setegid(egid);
 155         if (stat(sync_file, &tmp) < 0) {
 156                 mode_t omask = umask(002);
 157                 sync_fp = fopen(sync_file, "w+");
 158                 umask(omask);
 159         } else
 160                 sync_fp = fopen(sync_file, "r+");
 161         setegid(gid);
 162         if (sync_fp == NULL)
 163                 return -1;
 164         sync_seek = 0;
 165         return 0;
 166 }
 167
 168 void
 169 sync_close(int doremove)
 170 {
 171         if (sync_fp != 0)
 172                 fclose(sync_fp);
 173         if (doremove) {
 174                 setegid(egid);
 175                 unlink(sync_file);
 176                 setegid(gid);
 177         }
 178 }
 179
 180 void
 181 Write(int type, struct ship *ship, long a, long b, long c, long d)
 182 {
 183         size_t max = sizeof(sync_buf) - (sync_bp - sync_buf);
 184
 185         snprintf(sync_bp, max, "%d %d 0 %ld %ld %ld %ld\n",
 186                        type, ship->file->index, a, b, c, d);
 187         while (*sync_bp++)
 188                 ;
 189         sync_bp--;
 190         if (sync_bp >= &sync_buf[sizeof sync_buf])
 191                 abort();
 192         sync_update(type, ship, NULL, a, b, c, d);
 193 }
 194
 195 void
 196 Writestr(int type, struct ship *ship, const char *a)
 197 {
 198         size_t max = sizeof(sync_buf) - (sync_bp - sync_buf);
 199
 200         snprintf(sync_bp, max, "%d %d 1 %s\n", type, ship->file->index, a);
 201         while (*sync_bp++)
 202                 ;
 203         sync_bp--;
 204         if (sync_bp >= &sync_buf[sizeof sync_buf])
 205                 abort();
 206         sync_update(type, ship, a, 0, 0, 0, 0);
 207 }
 208
 209 int
 210 Sync(void)
 211 {
 212         sig_t sighup, sigint;
 213         int n;
 214         int type, shipnum, isstr;
 215         char *astr;
 216         long a, b, c, d;
 217         char buf[80];
 218         char erred = 0;
 219
 220         sighup = signal(SIGHUP, SIG_IGN);
 221         sigint = signal(SIGINT, SIG_IGN);
 222         for (n = TIMEOUT; --n >= 0;) {
 223 #ifdef LOCK_EX
 224                 if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
 225                         break;
 226                 if (errno != EWOULDBLOCK)
 227                         return -1;
 228 #else
 229                 setegid(egid);
 230                 if (link(sync_file, sync_lock) >= 0) {
 231                         setegid(gid);
 232                         break;
 233                 }
 234                 setegid(gid);
 235                 if (errno != EEXIST)
 236                         return -1;
 237 #endif
 238                 sleep(1);
 239         }
 240         if (n <= 0)
 241                 return -1;
 242         fseek(sync_fp, sync_seek, SEEK_SET);
 243         for (;;) {
 244                 switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
 245                 case 3:
 246                         break;
 247                 case EOF:
 248                         goto out;
 249                 default:
 250                         goto bad;
 251                 }
 252                 if (shipnum < 0 || shipnum >= cc->vessels)
 253                         goto bad;
 254                 if (isstr != 0 && isstr != 1)
 255                         goto bad;
 256                 if (isstr) {
 257                         int ch;
 258                         char *p;
 259
 260                         for (p = buf;;) {
 261                                 ch = getc(sync_fp);
 262                                 *p++ = (char)ch;
 263                                 switch (ch) {
 264                                 case '\n':
 265                                         p--;
 266                                 case EOF:
 267                                         break;
 268                                 default:
 269                                         if (p >= buf + sizeof buf)
 270                                                 p--;
 271                                         continue;
 272                                 }
 273                                 break;
 274                         }
 275                         *p = 0;
 276                         for (p = buf; *p == ' '; p++)
 277                                 ;
 278                         astr = p;
 279                         a = b = c = d = 0;
 280                 } else {
 281                         if (fscanf(sync_fp, "%ld%ld%ld%ld", &a, &b, &c, &d) != 4)
 282                                 goto bad;
 283                         astr = NULL;
 284                 }
 285                 if (sync_update(type, SHIP(shipnum), astr, a, b, c, d) < 0)
 286                         goto bad;
 287         }
 288 bad:
 289         erred++;
 290 out:
 291         if (!erred && sync_bp != sync_buf) {
 292                 fseek(sync_fp, 0L, SEEK_END);
 293                 fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
 294                         sync_fp);
 295                 fflush(sync_fp);
 296                 sync_bp = sync_buf;
 297         }
 298         sync_seek = ftell(sync_fp);
 299 #ifdef LOCK_EX
 300         flock(fileno(sync_fp), LOCK_UN);
 301 #else
 302         setegid(egid);
 303         unlink(sync_lock);
 304         setegid(gid);
 305 #endif
 306         signal(SIGHUP, sighup);
 307         signal(SIGINT, sigint);
 308         return erred ? -1 : 0;
 309 }
 310
 311 static int
 312 sync_update(int type, struct ship *ship, const char *astr, long a, long b, long c, long d)
 313 {
 314         switch (type) {
 315         case W_DBP: {
 316                 struct BP *p = &ship->file->DBP[a];
 317                 p->turnsent = b;
 318                 p->toship = SHIP(c);
 319                 p->mensent = d;
 320                 break;
 321                 }
 322         case W_OBP: {
 323                 struct BP *p = &ship->file->OBP[a];
 324                 p->turnsent = b;
 325                 p->toship = SHIP(c);
 326                 p->mensent = d;
 327                 break;
 328                 }
 329         case W_FOUL: {
 330                 struct snag *p = &ship->file->foul[a];
 331                 if (SHIP(a)->file->dir == 0)
 332                         break;
 333                 if (p->sn_count++ == 0)
 334                         p->sn_turn = turn;
 335                 ship->file->nfoul++;
 336                 break;
 337                 }
 338         case W_GRAP: {
 339                 struct snag *p = &ship->file->grap[a];
 340                 if (SHIP(a)->file->dir == 0)
 341                         break;
 342                 if (p->sn_count++ == 0)
 343                         p->sn_turn = turn;
 344                 ship->file->ngrap++;
 345                 break;
 346                 }
 347         case W_UNFOUL: {
 348                 struct snag *p = &ship->file->foul[a];
 349                 if (p->sn_count > 0) {
 350                         if (b) {
 351                                 ship->file->nfoul -= p->sn_count;
 352                                 p->sn_count = 0;
 353                         } else {
 354                                 ship->file->nfoul--;
 355                                 p->sn_count--;
 356                         }
 357                 }
 358                 break;
 359                 }
 360         case W_UNGRAP: {
 361                 struct snag *p = &ship->file->grap[a];
 362                 if (p->sn_count > 0) {
 363                         if (b) {
 364                                 ship->file->ngrap -= p->sn_count;
 365                                 p->sn_count = 0;
 366                         } else {
 367                                 ship->file->ngrap--;
 368                                 p->sn_count--;
 369                         }
 370                 }
 371                 break;
 372                 }
 373         case W_SIGNAL:
 374                 if (mode == MODE_PLAYER) {
 375                         if (nobells)
 376                                 Signal("$$: %s", ship, astr);
 377                         else
 378                                 Signal("\7$$: %s", ship, astr);
 379                 }
 380                 break;
 381         case W_CREW: {
 382                 struct shipspecs *s = ship->specs;
 383                 s->crew1 = a;
 384                 s->crew2 = b;
 385                 s->crew3 = c;
 386                 break;
 387                 }
 388         case W_CAPTAIN:
 389                 strlcpy(ship->file->captain, astr,
 390                         sizeof ship->file->captain);
 391                 break;
 392         case W_CAPTURED:
 393                 if (a < 0)
 394                         ship->file->captured = 0;
 395                 else
 396                         ship->file->captured = SHIP(a);
 397                 break;
 398         case W_CLASS:
 399                 ship->specs->class = a;
 400                 break;
 401         case W_DRIFT:
 402                 ship->file->drift = a;
 403                 break;
 404         case W_EXPLODE:
 405                 if ((ship->file->explode = a) == 2)
 406                         ship->file->dir = 0;
 407                 break;
 408         case W_FS:
 409                 ship->file->FS = a;
 410                 break;
 411         case W_GUNL: {
 412                 struct shipspecs *s = ship->specs;
 413                 s->gunL = a;
 414                 s->carL = b;
 415                 break;
 416                 }
 417         case W_GUNR: {
 418                 struct shipspecs *s = ship->specs;
 419                 s->gunR = a;
 420                 s->carR = b;
 421                 break;
 422                 }
 423         case W_HULL:
 424                 ship->specs->hull = a;
 425                 break;
 426         case W_MOVE:
 427                 strlcpy(ship->file->movebuf, astr,
 428                         sizeof ship->file->movebuf);
 429                 break;
 430         case W_PCREW:
 431                 ship->file->pcrew = a;
 432                 break;
 433         case W_POINTS:
 434                 ship->file->points = a;
 435                 break;
 436         case W_QUAL:
 437                 ship->specs->qual = a;
 438                 break;
 439         case W_RIGG: {
 440                 struct shipspecs *s = ship->specs;
 441                 s->rig1 = a;
 442                 s->rig2 = b;
 443                 s->rig3 = c;
 444                 s->rig4 = d;
 445                 break;
 446                 }
 447         case W_RIG1:
 448                 ship->specs->rig1 = a;
 449                 break;
 450         case W_RIG2:
 451                 ship->specs->rig2 = a;
 452                 break;
 453         case W_RIG3:
 454                 ship->specs->rig3 = a;
 455                 break;
 456         case W_RIG4:
 457                 ship->specs->rig4 = a;
 458                 break;
 459         case W_COL:
 460                 ship->file->col = a;
 461                 break;
 462         case W_DIR:
 463                 ship->file->dir = a;
 464                 break;
 465         case W_ROW:
 466                 ship->file->row = a;
 467                 break;
 468         case W_SINK:
 469                 if ((ship->file->sink = a) == 2)
 470                         ship->file->dir = 0;
 471                 break;
 472         case W_STRUCK:
 473                 ship->file->struck = a;
 474                 break;
 475         case W_TA:
 476                 ship->specs->ta = a;
 477                 break;
 478         case W_ALIVE:
 479                 alive = 1;
 480                 break;
 481         case W_TURN:
 482                 turn = a;
 483                 break;
 484         case W_WIND:
 485                 winddir = a;
 486                 windspeed = b;
 487                 break;
 488         case W_BEGIN:
 489                 strcpy(ship->file->captain, "begin");
 490                 people++;
 491                 break;
 492         case W_END:
 493                 *ship->file->captain = 0;
 494                 ship->file->points = 0;
 495                 people--;
 496                 break;
 497         case W_DDEAD:
 498                 hasdriver = 0;
 499                 break;
 500         default:
 501                 fprintf(stderr, "sync_update: unknown type %d\r\n", type);
 502                 return -1;
 503         }
 504         return 0;
 505 }