#define ILLEGAL_FILE_NAME 'F'
#define ILLEGAL_IP_ADDRESS 'I'
#define ILLEGAL_UID 'U'
#define ILLEGAL_PORT 'P'
#define ILLEGAL_PROGRAM 'R'
#define OK '\0'


struct ElementList {
  char *element;
  struct ElementList *next;
};

struct ConfigLine {
  struct ElementList *uids;
  struct ElementList *programs;
  struct ElementList *IPAddresses;
  struct ElementList *ports;
};

struct ConfigEntry {
  char *uid;
  char *program;
  char *IPAddress;
  int port;
};

struct FirewallConfig {
  struct ConfigEntry *entry;
  struct FirewallConfig *left;
  struct FirewallConfig *right;
};

extern int compareEntry (struct ConfigEntry *,  struct ConfigEntry *);
extern struct ConfigLine *parseLine (char *, int *);