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/* environment.c -- Function for extracting data from the OpenVPN environment table
*
* GPLv2 only - Copyright (C) 2008 - 2012
* David Sommerseth <dazo@users.sourceforge.net>
*
* 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; version 2
* of the License.
*
* 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.
*
*/
/**
* @file environment.c
* @author David Sommerseth <dazo@users.sourceforge.net>
* @date 2008-08-06
*
* @brief Function for extracting data from the OpenVPN environment table.
*
*/
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <eurephia_nullsafe.h>
#include <eurephia_context.h>
#include <eurephia_log.h>
/**
* get_env() retrieve values from the openvpn environment table
*
* @param ctx eurephiaCTX context
* @param logmasking If 1, the value will be masked in the log files (eg. to hide password)
* @param len How many bytes to copy out of the environment variable
* @param envp the environment table
* @param fmt The key to look for (stdarg)
*
* @return Returns a char * with the value, or NULL if not found. If found, the return value
* will be allocated on the heap and free() must be called on the value to avoid memory
* leaks.
*/
char *get_env(eurephiaCTX *ctx, int logmasking, size_t len,
const char *envp[], const char *fmt, ... )
{
if (envp) {
va_list ap;
char key[384];
int keylen = 0;
int i;
// Build up the key we are looking for
memset(&key, 0, 384);
va_start(ap, fmt);
vsnprintf(key, 382, fmt, ap);
// Find the key
keylen = strlen (key);
for (i = 0; envp[i]; ++i) {
if (!strncmp (envp[i], key, keylen)) {
const char *cp = envp[i] + keylen;
char *ret = NULL;
if (*cp == '=') {
ret = malloc_nullsafe(ctx, len+2);
strncpy(ret, cp+1, len);
#ifdef ENABLE_DEBUG
int do_mask = 0;
#ifndef SHOW_SECRETS
do_mask = logmasking;
#endif
if( ctx != NULL ) {
DEBUG(ctx, 30, "Function call: get_env(envp, '%s') == '%s'",
key, (do_mask == 0 ? ret : "xxxxxxxxxxxxxx"));
}
#endif
return ret;
}
}
}
if( ctx != NULL ) {
DEBUG(ctx, 15, "Function call: get_env(envp, '%s') -- environment variable not found",
key);
}
va_end(ap);
}
return NULL;
}
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