ndhc/ndhc.h

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/* ndhc.h - DHCP client
*
* Copyright 2014-2020 Nicholas J. Kain <njkain at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef NJK_NDHC_NDHC_H_
#define NJK_NDHC_NDHC_H_
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#include <stdint.h>
#include <stdbool.h>
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#include <limits.h>
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#include <net/if.h>
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#include "nk/random.h"
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enum arp_state {
ARP_QUERY = 0,
ARP_FOUND,
ARP_FAILED,
};
enum fprint_state {
FPRINT_NONE = 0,
FPRINT_INPROGRESS,
FPRINT_DONE,
};
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struct client_state_t {
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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;
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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;
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};
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
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int ifindex; // Index number of the interface to use
uint8_t clientid_len; // Length of the clientid
bool abort_if_no_lease; // Abort if no lease
bool enable_rfkill; // Listen for rfkill events
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};
enum {
SIGNAL_NONE = 0,
SIGNAL_EXIT,
SIGNAL_RENEW,
SIGNAL_RELEASE
};
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extern struct client_config_t client_config;
extern int ifchSock[2];
extern int ifchStream[2];
extern int sockdSock[2];
extern int sockdStream[2];
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extern char state_dir[PATH_MAX];
extern char chroot_dir[PATH_MAX];
extern char resolv_conf_d[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);
int get_clientid_string(const char *str, size_t slen);
void print_version(void);
#endif /* NJK_NDHC_NDHC_H_ */