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/* -*- c-file-style: "java"; indent-tabs-mode: nil; tab-width: 4; fill-column: 78 -*-
*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2002, 2003 by Martin Pool <mbp@samba.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "distcc.h"
#include "trace.h"
#include "util.h"
#include "exitcode.h"
/**
* @file
* @brief Protect against unbounded recursion.
*
* It would be fairly easy for somebody to get confused in masquerade mode and
* try to get distcc to invoke itself in a loop. We can't always work out the
* right thing to do but we can at least flag an error.
*
* This environment variable is set to guard against distcc accidentally
* recursively invoking itself, thinking it's the real compiler.
**/
static const char dcc_safeguard_name[] = "_DISTCC_SAFEGUARD";
static char dcc_safeguard_set[] = "_DISTCC_SAFEGUARD=1";
static int dcc_safeguard_level;
int dcc_recursion_safeguard(void)
{
char *env = getenv(dcc_safeguard_name);
if (env) {
rs_trace("safeguard: %s", env);
if (!(dcc_safeguard_level = atoi(env)))
dcc_safeguard_level = 1;
}
else
dcc_safeguard_level = 0;
rs_trace("safeguard level=%d", dcc_safeguard_level);
return dcc_safeguard_level;
}
int dcc_increment_safeguard(void)
{
if (dcc_safeguard_level > 0)
dcc_safeguard_set[sizeof dcc_safeguard_set-2] = dcc_safeguard_level+'1';
rs_trace("setting safeguard: %s", dcc_safeguard_set);
if ((putenv(strdup(dcc_safeguard_set)) == -1)) {
rs_log_error("putenv failed");
/* and continue */
}
return 0;
}
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