4d739acbdd
The purpose of the changing xid is to prevent misinterpreting delayed messages, and the rare chance where it's randomly the same breaks this sequence-id property.
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
// Copyright 2014-2020 Nicholas J. Kain <njkain at gmail dot com>
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// SPDX-License-Identifier: MIT
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#ifndef NJK_NDHC_NDHC_H_
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#define NJK_NDHC_NDHC_H_
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#include <stdint.h>
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#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 {
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ARP_QUERY = 0,
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ARP_FOUND,
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ARP_FAILED,
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};
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enum fprint_state {
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FPRINT_NONE = 0,
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FPRINT_INPROGRESS,
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FPRINT_DONE,
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};
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struct client_state_t {
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struct nk_random_state rnd_state;
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long long leaseStartTime, renewTime, rebindTime;
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long long dhcp_wake_ts;
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int ifDeconfig; // Set if the interface has already been deconfigured.
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int listenFd, arpFd, nlFd, rfkillFd;
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int server_arp_sent, router_arp_sent;
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uint32_t nlPortId;
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unsigned int num_dhcp_requests, num_dhcp_renews;
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uint32_t clientAddr, serverAddr, srcAddr, routerAddr;
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uint32_t lease, xid;
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uint8_t routerArp[6], serverArp[6];
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enum arp_state server_arp_state, router_arp_state;
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enum fprint_state fp_state;
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bool using_dhcp_bpf, arp_is_defense, check_fingerprint, program_init,
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sent_renew_or_rebind, carrier_up;
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bool sent_gw_query, sent_first_announce, sent_second_announce;
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};
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struct client_config_t {
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char interface[IFNAMSIZ]; // The name of the interface to use
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char clientid[64]; // Optional client id to use
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char hostname[64]; // Optional hostname to use
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char vendor[64]; // Vendor identification that will be sent
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uint8_t arp[6]; // Our arp address
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uint32_t rfkillIdx; // Index of the corresponding rfkill device
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int metric; // Metric for the default route
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int ifindex; // Index number of the interface to use
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int s6_notify_fd; // File descriptor for s6 notify mechanism
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uint8_t clientid_len; // Length of the clientid
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bool abort_if_no_lease; // Abort if no lease
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bool enable_rfkill; // Listen for rfkill events
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bool enable_s6_notify; // Perform s6 startup notification
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};
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enum {
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SIGNAL_NONE = 0,
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SIGNAL_EXIT,
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SIGNAL_RENEW,
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SIGNAL_RELEASE
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};
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extern struct client_config_t client_config;
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extern int ifchSock[2];
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extern int ifchStream[2];
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extern int sockdSock[2];
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extern int sockdStream[2];
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extern int scriptdSock[2];
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extern int scriptdStream[2];
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extern char state_dir[PATH_MAX];
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extern char chroot_dir[PATH_MAX];
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extern char resolv_conf_d[PATH_MAX];
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extern char script_file[PATH_MAX];
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extern uid_t ndhc_uid;
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extern gid_t ndhc_gid;
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int signals_flagged(void);
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bool carrier_isup(void);
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void set_client_addr(const char *v);
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void show_usage(void);
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void signal_exit(int status);
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int get_clientid_string(const char *str, size_t slen);
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void print_version(void);
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static inline void advance_xid(struct client_state_t *cs) {
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uint32_t o = cs->xid;
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do {
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cs->xid = nk_random_u32(&cs->rnd_state);
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} while (cs->xid == o);
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}
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#endif
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