06a541261e
There's really no advantage to using signalfd in ndhc, particularly since the normal POSIX signal API is now used for handling SIGCHLD in ndhc-master. So just use the tried and true volatile sig_atomic_t set and check approach. The only intended behavior change is in the dhcp RELEASE state -- before there would be a spurious attempt at renewing a nonexistent lease when the RENEW signal was received.
108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/* ndhc.h - DHCP client
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*
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* Copyright 2014-2020 Nicholas J. Kain <njkain at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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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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 epollFd, 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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bool using_dhcp_bpf, arp_is_defense, check_fingerprint, program_init,
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sent_renew_or_rebind;
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bool sent_gw_query, sent_first_announce, sent_second_announce,
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init_fingerprint_inprogress;
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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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uint8_t clientid_len; // Length of the clientid
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bool quit_after_lease; // Quit after obtaining lease
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bool abort_if_no_lease; // Abort if no lease
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bool background_if_no_lease; // Fork to background if no lease
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bool enable_rfkill; // Listen for rfkill events
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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 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 pidfile[PATH_MAX];
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extern uid_t ndhc_uid;
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extern gid_t ndhc_gid;
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extern bool write_pid_enabled;
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int signals_flagged(void);
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void set_client_addr(const char v[static 1]);
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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[static 1], size_t slen);
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void background(void);
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void print_version(void);
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#endif /* NJK_NDHC_NDHC_H_ */
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