10c4031d64
simply drop the privilege right after the program is started. Thanks to bde for giving me good suggestion about this problem.
177 lines
4.0 KiB
C
177 lines
4.0 KiB
C
/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1980, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)teach.c 8.1 (Berkeley) 5/31/93";
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#endif /* not lint */
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "back.h"
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char *hello[];
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char *list[];
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char *intro1[];
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char *intro2[];
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char *moves[];
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char *remove[];
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char *hits[];
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char *endgame[];
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char *doubl[];
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char *stragy[];
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char *prog[];
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char *lastch[];
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extern char ospeed; /* tty output speed for termlib */
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char *helpm[] = {
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"\nEnter a space or newline to roll, or",
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" b to display the board",
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" d to double",
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" q to quit\n",
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0
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};
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char *contin[] = {
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"",
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0
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};
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main (argc,argv)
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int argc;
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char **argv;
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{
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register int i;
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uid_t uid;
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/*Drop the privilege.*/
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uid = getuid();
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setreuid (uid,uid);
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acnt = 1;
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signal (2,getout);
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if (gtty (0,&tty) == -1) /* get old tty mode */
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errexit ("teachgammon(gtty)");
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old = tty.sg_flags;
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#ifdef V7
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raw = ((noech = old & ~ECHO) | CBREAK); /* set up modes */
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#else
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raw = ((noech = old & ~ECHO) | RAW); /* set up modes */
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#endif
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ospeed = tty.sg_ospeed; /* for termlib */
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tflag = getcaps (getenv ("TERM"));
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getarg (argc, argv);
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if (tflag) {
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noech &= ~(CRMOD|XTABS);
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raw &= ~(CRMOD|XTABS);
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clear();
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}
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text (hello);
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text (list);
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i = text (contin);
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if (i == 0)
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i = 2;
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init();
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while (i)
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switch (i) {
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case 1:
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leave();
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case 2:
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if (i = text(intro1))
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break;
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wrboard();
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if (i = text(intro2))
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break;
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case 3:
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if (i = text(moves))
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break;
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case 4:
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if (i = text(remove))
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break;
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case 5:
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if (i = text(hits))
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break;
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case 6:
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if (i = text(endgame))
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break;
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case 7:
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if (i = text(doubl))
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break;
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case 8:
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if (i = text(stragy))
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break;
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case 9:
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if (i = text(prog))
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break;
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case 10:
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if (i = text(lastch))
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break;
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}
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tutor();
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}
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leave() {
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register int i;
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if (tflag)
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clear();
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else
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writec ('\n');
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fixtty(old);
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args[0] = strdup("backgammon");
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args[acnt++] = strdup("-n");
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args[acnt] = 0;
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execv (EXEC,args);
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for (i = 0; i < acnt; i++)
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free (args[i]);
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writel ("Help! Backgammon program is missing\007!!\n");
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exit (-1);
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}
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