cidr.h

#ifndef __CIDR_H
#define __CIDR_H

#define BAD_ADDRESS -3
#define BAD_CIDR_BLOCK -4

typedef struct {
  int address;
  int mask;
  char *address_string;
} CIDR;

#define MAX_BLOCK_SIZE 200

typedef struct {
  int lower;
  int upper;
  char block[MAX_BLOCK_SIZE];
} range;

int cidr_contains(char *block, int address);
int address_in_range(range *r, int ip);
int ip_address_to_integer(const char *address);
int block_to_range(char *block, range *range);

#endif