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/*
* SPDX-FileCopyrightText: 2001-2003 Daniel Kelly
* SPDX-FileCopyrightText: Peter Pentchev <roam@ringlet.net>
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <err.h>
#include "prips.h"
#include "except.h"
static void fill(int octet[4][256]);
/*****************************************************************/
/* This function parses the exception string and adds all of the */
/* exceptions to the proper place in the exception table. A '.' */
/* is used to separate octets. Numbers are separated by any non */
/* digit other than the '.', which has special meaning. */
/*****************************************************************/
void set_exceptions(const char * const exp, int octet[4][256])
{
int excludeind = 0, bufferind = 0, octind = 0;
char buffer[4];
fill(octet);
for(size_t i = 0; i < strlen(exp) + 1; i++)
{
if( isdigit(exp[i]))
{
buffer[bufferind] = exp[i];
bufferind++;
if (bufferind >= 3)
errx(1, "Invalid octet value specified for exclusion");
}
else
{
if(bufferind)
{
buffer[bufferind] = '\0';
const int value = atoi(buffer);
if (value > 255)
errx(1, "Invalid octet value specified for exclusion");
octet[octind][excludeind] = value;
bufferind = 0;
excludeind++;
}
if(exp[i] == '.')
{
octind++;
if (octind >= 4)
errx(1, "Too many dots specified in an exclusion pattern");
excludeind = 0;
}
}
}
}
static void fill(int octet[4][256])
{
for(register int i = 0; i < 4; i++)
for(register int j = 0; j < 256; j++)
octet[i][j] = -1;
}
/*******************************************************************/
/* Compares each octet against the list of exceptions for that */
/* octet. If the octet is in the list of exceptions the 'current' */
/* argument is incremented so that the 'current' variable is moved */
/* up one octet. I hope to God this makes sense... it's late. I'm */
/* tired. */
/*******************************************************************/
bool except(uint32_t * const current, int octet[4][256], const int increment)
{
for(register int i = 0; i < 4; i++)
{
for(register int j = 0; j < 256; j++)
{
switch(i)
{
case 0:
if((int)((*current >> 24) & 0xff) == octet[i][j])
{
*current += (uint32_t)(1 << 24) - increment;
return(true);
}
break;
case 1:
if((int)((*current >> 16) & 0xff) == octet[i][j])
{
*current += (uint32_t)(1 << 16) - increment;
return(true);
}
break;
case 2:
if((int)((*current >> 8) & 0xff) == octet[i][j])
{
*current += (uint32_t)(1 << 8) - increment;
return(true);
}
break;
case 3:
if((int)(*current & 0xff) == octet[i][j])
return(true);
break;
}
}
}
return(false);
}
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