DeforaOS/VPN
DeforaOS/VPN
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This commit is contained in:
Pierre Pronchery 2011-12-05 10:51:37 +00:00
parent 02e643a6b8
commit 38638ae8de
1 changed files with 104 additions and 0 deletions
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src/common.c Normal file
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/* $Id$ */
/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System VPN */
/* 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "VPN.h"
/* types */
typedef struct _VPNErrno
{
int native;
int error;
} VPNError;
typedef struct _VPNFlag
{
unsigned int native;
unsigned int flag;
} VPNFlag;
/* variables */
/* errors */
static VPNError _vpn_error[] =
{
{ EPERM, VPN_EPERM },
{ EBADF, VPN_EBADF },
{ EPROTO, VPN_EPROTO }
};
static const size_t _vpn_error_cnt = sizeof(_vpn_error) / sizeof(*_vpn_error);
/* prototypes */
static int _vpn_errno(VPNError * error, size_t error_cnt, int value,
int reverse);
static int _vpn_flags(VPNFlag * flags, size_t flags_cnt, int value,
int reverse);
/* functions */
/* vpn_errno */
static int _vpn_errno(VPNError * error, size_t error_cnt, int value,
int reverse)
{
size_t i;
for(i = 0; i < error_cnt; i++)
if(reverse == 0 && value == error[i].native)
return -error[i].error;
else if(reverse != 0 && value == error[i].error)
{
errno = error[i].native;
return -1;
}
/* FIXME really is an unknown error */
if(reverse == 0)
return -VPN_EPROTO;
errno = EPROTO;
return -1;
}
/* vpn_flags */
static int _vpn_flags(VPNFlag * flags, size_t flags_cnt, int value, int reverse)
{
int ret = 0;
size_t i;
for(i = 0; i < flags_cnt; i++)
if(reverse == 0)
{
if((value & flags[i].native) == flags[i].native)
{
value -= flags[i].native;
ret |= flags[i].flag;
}
}
else if((value & flags[i].flag) == flags[i].flag)
{
value -= flags[i].flag;
ret |= flags[i].native;
}
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s(%p, %lu, %d, %d) => %d\n", __func__,
(void *)flags, flags_cnt, value, reverse, (value == 0)
? ret : -1);
#endif
if(value != 0)
return -1;
return ret;
}