run_command.h

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/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single TCP/UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2002-2025 OpenVPN Technologies, Inc. <sales@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef RUN_COMMAND_H
#define RUN_COMMAND_H
 
#include "basic.h"
#include "env_set.h"
 
/* Script security */
#define SSEC_NONE     0
#define SSEC_BUILT_IN 1
#define SSEC_SCRIPTS  2
#define SSEC_PW_ENV   3
 
#define OPENVPN_EXECVE_ERROR       -1  /* generic error while forking to run an external program */
#define OPENVPN_EXECVE_NOT_ALLOWED -2  /* external program not run due to script security */
#define OPENVPN_EXECVE_FAILURE     127 /* exit code passed back from child when execve fails */
 
int script_security(void);
 
void script_security_set(int level);
 
/* openvpn_execve flags */
#define S_SCRIPT    (1 << 0)
#define S_FATAL     (1 << 1)
#define S_EXITCODE  (1 << 2)
#define S_NOWAITPID (1 << 3)
 
/* wrapper around the execve() call */
int openvpn_popen(const struct argv *a, const struct env_set *es);
 
bool openvpn_execve_allowed(const unsigned int flags);
 
int openvpn_execve_check(const struct argv *a, const struct env_set *es, const unsigned int flags,
                         const char *error_message);
 
 
#ifndef WIN32
bool openvpn_waitpid_check(pid_t pid, const char *msg_prefix, int msglevel);
 
#endif
 
static inline int
openvpn_run_script(const struct argv *a, const struct env_set *es, const unsigned int flags,
                   const char *hook)
{
    char msg[256];
 
    snprintf(msg, sizeof(msg), "WARNING: Failed running command (%s)", hook);
    return openvpn_execve_check(a, es, flags | S_SCRIPT, msg);
}
 
#endif /* ifndef RUN_COMMAND_H */