ndhc/ndhc.h
2023-02-13 00:18:16 -05:00

97 lines
2.8 KiB
C

// Copyright 2014-2020 Nicholas J. Kain <njkain at gmail dot com>
// SPDX-License-Identifier: MIT
#ifndef NJK_NDHC_NDHC_H_
#define NJK_NDHC_NDHC_H_
#include <stdint.h>
#include <stdbool.h>
#include <limits.h>
#include <net/if.h>
#include "nk/random.h"
enum arp_state {
ARP_QUERY = 0,
ARP_FOUND,
ARP_FAILED,
};
enum fprint_state {
FPRINT_NONE = 0,
FPRINT_INPROGRESS,
FPRINT_DONE,
};
struct client_state_t {
struct nk_random_state rnd_state;
long long leaseStartTime, renewTime, rebindTime;
long long dhcp_wake_ts;
int ifDeconfig; // Set if the interface has already been deconfigured.
int listenFd, arpFd, nlFd, rfkillFd;
int server_arp_sent, router_arp_sent;
uint32_t nlPortId;
unsigned int num_dhcp_requests, num_dhcp_renews;
uint32_t clientAddr, serverAddr, srcAddr, routerAddr;
uint32_t lease, xid;
uint8_t routerArp[6], serverArp[6];
enum arp_state server_arp_state, router_arp_state;
enum fprint_state fp_state;
bool using_dhcp_bpf, arp_is_defense, check_fingerprint, program_init,
sent_renew_or_rebind, carrier_up;
bool sent_gw_query, sent_first_announce, sent_second_announce;
};
struct client_config_t {
char interface[IFNAMSIZ]; // The name of the interface to use
char clientid[64]; // Optional client id to use
char hostname[64]; // Optional hostname to use
char vendor[64]; // Vendor identification that will be sent
uint8_t arp[6]; // Our arp address
uint32_t rfkillIdx; // Index of the corresponding rfkill device
int metric; // Metric for the default route
int ifindex; // Index number of the interface to use
int s6_notify_fd; // File descriptor for s6 notify mechanism
uint8_t clientid_len; // Length of the clientid
bool abort_if_no_lease; // Abort if no lease
bool enable_rfkill; // Listen for rfkill events
bool enable_s6_notify; // Perform s6 startup notification
};
enum {
SIGNAL_NONE = 0,
SIGNAL_EXIT,
SIGNAL_RENEW,
SIGNAL_RELEASE
};
extern struct client_config_t client_config;
extern int ifchSock[2];
extern int ifchStream[2];
extern int sockdSock[2];
extern int sockdStream[2];
extern int scriptdSock[2];
extern int scriptdStream[2];
extern char state_dir[PATH_MAX];
extern char chroot_dir[PATH_MAX];
extern char resolv_conf_d[PATH_MAX];
extern char script_file[PATH_MAX];
extern uid_t ndhc_uid;
extern gid_t ndhc_gid;
int signals_flagged(void);
bool carrier_isup(void);
void set_client_addr(const char *v);
void show_usage(void);
void signal_exit(int status);
void print_version(void);
static inline void advance_xid(struct client_state_t *cs) {
uint32_t o = cs->xid;
do {
cs->xid = nk_random_u32(&cs->rnd_state);
} while (cs->xid == o);
}
#endif