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/* $OpenBSD: dhcpd.h,v 1.299 2021/03/28 16:23:05 krw Exp $ */
/*
* Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
* 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 <mellon@fugue.com> 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);
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