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// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
// setprojectgrp.C
//
// When run as
// setprojectgrp Path
// sets group of file at Path to boinc_project
//
// setprojectgrp runs setuid boinc_master and setgid boinc_project
#include <unistd.h>
#include <grp.h>
#include <cstdio>
#include <cerrno>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
int main(int argc, char** argv) {
gid_t project_gid;
int retval = 0;
struct stat sbuf;
project_gid = getegid();
#if 0 // For debugging
fprintf(stderr, "setprojectgrp argc=%d, arg[1]= %s, boinc_project gid = %d\n", argc, argv[1], project_gid);
fflush(stderr);
#endif
// chown() doesn't change ownershp of symbolic links; it follows the link and
// changes the file is not available in OS 10.3.9.
//
// But we don't really need to worry about this, because the system ignores
// ownership & permissions of symbolic links anyway.
//
// Also, the target of a symbolic link may not be present if the slot containing
// the link is no longer in use.
//
if (lstat(argv[1], &sbuf) == 0) {
if (!S_ISLNK(sbuf.st_mode)) {
retval = chown(argv[1], (uid_t)-1, project_gid);
if (retval)
fprintf(stderr, "chown(%s, -1, %d) failed: errno=%d\n", argv[1], project_gid, errno);
}
}
return retval;
}
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