freebsd-dev/games/adventure/save.c
Alexander Langer 0a5e7ccdf9 Set the effective user id to that of the real user id when
saving/restoring a game (necessary when adventure is invoked via dm).
1996-10-15 01:53:48 +00:00

199 lines
6.1 KiB
C

/*-
* 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
static char sccsid[] = "@(#)save.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#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;
}
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);
seteuid(euid_save);
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;
}
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);
seteuid(euid_save);
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;
}