/* $OpenBSD: dhcpd.h,v 1.299 2021/03/28 16:23:05 krw Exp $ */ /* * Copyright (c) 2004 Henning Brauer * Copyright (c) 1995, 1996, 1997, 1998, 1999 * The Internet Software Consortium. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name of The Internet Software Consortium nor the names * of its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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. * * This software has been written for the Internet Software Consortium * by Ted Lemon in cooperation with Vixie * Enterprises. To learn more about the Internet Software Consortium, * see ``http://www.vix.com/isc''. To learn more about Vixie * Enterprises, see ``http://www.vix.com''. */ #define LOCAL_PORT 68 #define REMOTE_PORT 67 #define TERMINATE 1 #define RESTART 2 #define DB_TIMEFMT "%w %Y/%m/%d %T UTC" #define RT_BUF_SIZE 2048 struct option_data { unsigned int len; uint8_t *data; }; struct reject_elem { TAILQ_ENTRY(reject_elem) next; struct in_addr addr; }; struct client_lease { TAILQ_ENTRY(client_lease) next; time_t epoch; struct in_addr address; struct in_addr next_server; char *server_name; char *filename; char ssid[32]; uint8_t ssid_len; struct option_data options[DHO_COUNT]; }; #define BOOTP_LEASE(l) ((l)->options[DHO_DHCP_MESSAGE_TYPE].len == 0) /* Possible states in which the client can be. */ enum dhcp_state { S_PREBOOT, S_REBOOTING, S_INIT, S_SELECTING, S_REQUESTING, S_BOUND, S_RENEWING }; enum actions { ACTION_USELEASE, ACTION_DEFAULT, ACTION_SUPERSEDE, ACTION_PREPEND, ACTION_APPEND, ACTION_IGNORE }; TAILQ_HEAD(client_lease_tq, client_lease); struct client_config { struct option_data defaults[DHO_COUNT]; enum actions default_actions[DHO_COUNT]; struct in_addr address; struct in_addr next_server; struct option_data send_options[DHO_COUNT]; uint8_t required_options[DHO_COUNT]; uint8_t requested_options[DHO_COUNT]; int requested_option_count; int required_option_count; time_t offer_interval; time_t initial_interval; time_t link_interval; time_t retry_interval; time_t select_interval; time_t reboot_interval; time_t backoff_cutoff; TAILQ_HEAD(, reject_elem) reject_list; char *filename; char *server_name; }; struct interface_info { struct ether_addr hw_address; char name[IFNAMSIZ]; char ssid[32]; uint8_t ssid_len; int bpffd; /* bpf - reading & broadcast writing*/ int udpfd; /* udp - unicast writing */ unsigned char *rbuf; size_t rbuf_max; int errors; uint16_t index; int link_state; int rdomain; int flags; #define IFI_IN_CHARGE 0x01 uint32_t mtu; struct dhcp_packet recv_packet; struct dhcp_packet sent_packet; int sent_packet_length; uint32_t xid; struct timespec timeout; struct timespec reboot_timeout; struct timespec expiry; struct timespec rebind; struct timespec renew; void (*timeout_func)(struct interface_info *); uint16_t secs; struct timespec first_sending; struct timespec link_timeout; struct timespec offer_timeout; struct timespec select_timeout; enum dhcp_state state; struct in_addr destination; time_t interval; struct in_addr requested_address; struct client_lease *active; struct client_lease *offer; char *offer_src; struct proposal *configured; struct unwind_info *unwind_info; struct client_lease_tq lease_db; }; #define _PATH_DHCLIENT_CONF "/etc/dhclient.conf" #define _PATH_LEASE_DB "/var/db/dhclient.leases" /* options.c */ int pack_options(unsigned char *, int, struct option_data *); struct option_data *unpack_options(struct dhcp_packet *); char *pretty_print_option(unsigned int, struct option_data *, int); char *pretty_print_string(unsigned char *, size_t, int); char *code_to_name(int); char *code_to_format(int); int code_to_action(int, int); int name_to_code(char *); void merge_option_data(char *, struct option_data *, struct option_data *, struct option_data *); /* conflex.c */ extern int lexline, lexchar; extern char *token_line, *tlname; void new_parse(char *); int next_token(char **, FILE *); int peek_token(char **, FILE *); /* parse.c */ void skip_to_semi(FILE *); int parse_semi(FILE *); int parse_string(FILE *, char **); int parse_ip_addr(FILE *, struct in_addr *); int parse_cidr(FILE *, unsigned char *); int parse_number(FILE *, long long *, long long, long long); int parse_boolean(FILE *, unsigned char *); void parse_warn(char *); /* bpf.c */ int get_bpf_sock(char *); int get_udp_sock(int); int configure_bpf_sock(int); ssize_t send_packet(struct interface_info *, struct in_addr, struct in_addr, const char *); ssize_t receive_packet(unsigned char *, unsigned char *, struct sockaddr_in *, struct ether_addr *, struct dhcp_packet *); /* dispatch.c */ void dispatch(struct interface_info *, int); void set_timeout( struct interface_info *, time_t, void (*)(struct interface_info *)); void cancel_timeout(struct interface_info *); /* dhclient.c */ extern char *path_dhclient_conf; extern char *path_lease_db; extern char *log_procname; extern struct client_config *config; extern struct imsgbuf *unpriv_ibuf; extern int quit; extern int cmd_opts; #define OPT_NOACTION 0x01 #define OPT_VERBOSE 0x02 #define OPT_FOREGROUND 0x04 #define OPT_RELEASE 0x08 void dhcpoffer(struct interface_info *, struct option_data *, const char *); void dhcpack(struct interface_info *, struct option_data *, const char *); void dhcpnak(struct interface_info *, const char *); void bootreply(struct interface_info *, struct option_data *, const char *); void free_client_lease(struct client_lease *); void routefd_handler(struct interface_info *, int); void state_preboot(struct interface_info *); char *rfc1035_as_string(unsigned char *, size_t); /* packet.c */ void assemble_eh_header(struct ether_addr, struct ether_header *); ssize_t decode_udp_ip_header(unsigned char *, uint32_t, struct sockaddr_in *); uint32_t checksum(unsigned char *, uint32_t, uint32_t); uint32_t wrapsum(uint32_t); /* clparse.c */ void init_config(void); void read_conf(char *, uint8_t *, struct ether_addr *); void read_lease_db(struct client_lease_tq *); /* kroute.c */ unsigned int extract_route(uint8_t *, unsigned int, in_addr_t *, in_addr_t *, in_addr_t *); void write_resolv_conf(void); void propose(struct proposal *); void revoke_proposal(struct proposal *); void tell_unwind(struct unwind_info *, int);