/* $NetBSD: save.c,v 1.2 1995/03/21 12:05:08 cgd Exp $ */ /*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * The game adventure was originally written in Fortran by Will Crowther * and Don Woods. It was later translated to C and enhanced by Jim * Gillogly. This code is derived from software contributed to Berkeley * by Jim Gillogly at The Rand Corporation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static char sccsid[] = "@(#)save.c 8.1 (Berkeley) 5/31/93"; #else static char rcsid[] = "$NetBSD: save.c,v 1.2 1995/03/21 12:05:08 cgd Exp $"; #endif #endif /* not lint */ #include #include #include #include "hdr.h" struct savestruct { void *address; int width; }; struct savestruct save_array[] = { &abbnum, sizeof(abbnum), &attack, sizeof(attack), &blklin, sizeof(blklin), &bonus, sizeof(bonus), &chloc, sizeof(chloc), &chloc2, sizeof(chloc2), &clock1, sizeof(clock1), &clock2, sizeof(clock2), &closed, sizeof(closed), &closng, sizeof(closng), &daltlc, sizeof(daltlc), &demo, sizeof(demo), &detail, sizeof(detail), &dflag, sizeof(dflag), &dkill, sizeof(dkill), &dtotal, sizeof(dtotal), &foobar, sizeof(foobar), &gaveup, sizeof(gaveup), &holdng, sizeof(holdng), &iwest, sizeof(iwest), &k, sizeof(k), &k2, sizeof(k2), &knfloc, sizeof(knfloc), &kq, sizeof(kq), &latncy, sizeof(latncy), &limit, sizeof(limit), &lmwarn, sizeof(lmwarn), &loc, sizeof(loc), &maxdie, sizeof(maxdie), &mxscor, sizeof(mxscor), &newloc, sizeof(newloc), &numdie, sizeof(numdie), &obj, sizeof(obj), &oldlc2, sizeof(oldlc2), &oldloc, sizeof(oldloc), &panic, sizeof(panic), &saved, sizeof(saved), &savet, sizeof(savet), &scorng, sizeof(scorng), &spk, sizeof(spk), &stick, sizeof(stick), &tally, sizeof(tally), &tally2, sizeof(tally2), &tkk, sizeof(tkk), &turns, sizeof(turns), &verb, sizeof(verb), &wd1, sizeof(wd1), &wd2, sizeof(wd2), &wzdark, sizeof(wzdark), &yea, sizeof(yea), atloc, sizeof(atloc), dloc, sizeof(dloc), dseen, sizeof(dseen), fixed, sizeof(fixed), hinted, sizeof(hinted), link, sizeof(link), odloc, sizeof(odloc), place, sizeof(place), prop, sizeof(prop), tk, sizeof(tk), NULL, 0 }; save(outfile) /* Two passes on data: first to get checksum, second */ char *outfile; /* to output the data using checksum to start random #s */ { FILE *out; struct savestruct *p; char *s; long sum; int i; uid_t euid_save; crc_start(); for (p = save_array; p->address != NULL; p++) sum = crc(p->address, p->width); srandom((int) sum); euid_save = geteuid(); seteuid(getuid()); if ((out = fopen(outfile, "wb")) == NULL) { fprintf(stderr, "Hmm. The name \"%s\" appears to be magically blocked.\n", outfile); seteuid(euid_save); return 1; } seteuid(euid_save); fwrite(&sum, sizeof(sum), 1, out); /* Here's the random() key */ for (p = save_array; p->address != NULL; p++) { for (s = p->address, i = 0; i < p->width; i++, s++) *s = (*s ^ random()) & 0xFF; /* Lightly encrypt */ fwrite(p->address, p->width, 1, out); } fclose(out); return 0; } restore(infile) char *infile; { FILE *in; struct savestruct *p; char *s; long sum, cksum; int i; uid_t euid_save; euid_save = geteuid(); seteuid(euid_save); if ((in = fopen(infile, "rb")) == NULL) { fprintf(stderr, "Hmm. The file \"%s\" appears to be magically blocked.\n", infile); seteuid(euid_save); return 1; } seteuid(euid_save); fread(&sum, sizeof(sum), 1, in); /* Get the seed */ srandom((int) sum); for (p = save_array; p->address != NULL; p++) { fread(p->address, p->width, 1, in); for (s = p->address, i = 0; i < p->width; i++, s++) *s = (*s ^ random()) & 0xFF; /* Lightly decrypt */ } fclose(in); crc_start(); /* See if she cheated */ for (p = save_array; p->address != NULL; p++) cksum = crc(p->address, p->width); if (sum != cksum) /* Tsk tsk */ return 2; /* Altered the file */ /* We successfully restored, so this really was a save file */ /* Get rid of the file, but don't bother checking that we did */ return 0; }