mirror of
https://github.com/Ponce/slackbuilds
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82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/* Written by Menno E. Duursma for use with xbill */
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/*
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* This program is free software. It comes without any warranty.
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* Granted WTFPL, Version 2, as published by Sam Hocevar. See
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* http://sam.zoy.org/wtfpl/COPYING for more details.
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*/
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/*
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* Per default xbill sets its score file world writable
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* which obviously allows cheating ones hi-score :-(
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* Probably this came about since GTK+ doesn't allow setgid?
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*
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* In the install-script we move xbill to xbill-bin and install
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* this here wrapper thing as xbill, with setuid and video group
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* executable filesystem perms. Here we change groups to games.
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*
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* We should now be able make /var/xbill group-writable only...
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <grp.h>
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int main(int argc, char *argv[], char *envp[])
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{
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/*
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* hardcoded path/program to exec
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* and group to run under
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*/
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char prog[] = "/usr/bin/xbill-bin";
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char grpname[] = "games";
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struct group *grp;
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errno = 0;
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/* get our gid */
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grp = getgrnam(grpname);
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if (grp == NULL) {
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fprintf(stderr, "Error: getgrnam(%s) - %s\n",
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grpname,
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strerror(errno));
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exit(EXIT_FAILURE);
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}
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/* drop to the gid */
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if (setgid(grp->gr_gid)) {
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fprintf(stderr, "Error: setgid(%d) - %s\n",
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grp->gr_gid,
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strerror(errno));
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exit(EXIT_FAILURE);
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}
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/* drop back to calling uid */
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if (setuid(getuid())) {
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fprintf(stderr, "Error: setuid(%d) - %s\n",
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getuid(),
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strerror(errno));
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exit(EXIT_FAILURE);
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}
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/* tell the viewers wat is going to happen */
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fprintf(stderr, "Starting %s with uid = %d, gid = %d\n",
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prog,
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getuid(),
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getgid());
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/* fire it up */
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if (execve(prog, argv, envp) == -1) {
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fprintf(stderr, "Error: execve(%s, argv, envp) - %s\n",
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prog,
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strerror(errno));
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exit(EXIT_FAILURE);
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}
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return EXIT_SUCCESS;
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}
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