1 /* $OpenBSD: dhcpd.h,v 1.33 2004/05/06 22:29:15 deraadt Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
7 * Copyright (c) 1995, 1996, 1997, 1998, 1999
8 * The Internet Software Consortium. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of The Internet Software Consortium nor the names
20 * of its contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
24 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
25 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
28 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
31 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
32 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
34 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * This software has been written for the Internet Software Consortium
38 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
39 * Enterprises. To learn more about the Internet Software Consortium,
40 * see ``http://www.vix.com/isc''. To learn more about Vixie
41 * Enterprises, see ``http://www.vix.com''.
46 #include <sys/param.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
56 #include <net/if_dl.h>
57 #include <net/route.h>
59 #include <netinet/in.h>
60 #include <arpa/inet.h>
78 #include <libcasper.h>
79 #include <casper/cap_syslog.h>
85 #define REMOTE_PORT 67
93 struct string_list *next;
99 unsigned char iabuf[16];
103 struct iaddrlist *next;
108 struct dhcp_packet *raw;
113 struct iaddr client_addr;
114 struct interface_info *interface;
115 struct hardware *haddr;
116 struct option_data options[256];
125 struct client_lease {
126 struct client_lease *next;
127 time_t expiry, renewal, rebind;
128 struct iaddr address;
129 struct iaddr nextserver;
132 struct string_list *medium;
133 unsigned int is_static : 1;
134 unsigned int is_bootp : 1;
135 struct option_data options[256];
138 /* Possible states in which the client can be. */
149 struct client_config {
150 struct option_data defaults[256];
156 } default_actions[256];
158 struct option_data send_options[256];
159 u_int8_t required_options[256];
160 u_int8_t requested_options[256];
161 int requested_option_count;
163 time_t initial_interval;
164 time_t retry_interval;
165 time_t select_interval;
166 time_t reboot_timeout;
167 time_t backoff_cutoff;
168 struct string_list *media;
170 enum { IGNORE, ACCEPT, PREFER }
172 struct string_list *medium;
173 struct iaddrlist *reject_list;
176 struct client_state {
177 struct client_lease *active;
178 struct client_lease *new;
179 struct client_lease *offered_leases;
180 struct client_lease *leases;
181 struct client_lease *alias;
182 enum dhcp_state state;
183 struct iaddr destination;
186 time_t first_sending;
188 struct string_list *medium;
189 struct dhcp_packet packet;
191 struct iaddr requested_address;
192 struct client_config *config;
195 struct string_list *env;
199 struct interface_info {
200 struct interface_info *next;
201 struct hardware hw_address;
202 struct in_addr primary_address;
212 struct client_state *client;
221 struct timeout *next;
223 void (*func)(void *);
228 struct protocol *next;
230 void (*handler)(struct protocol *);
234 #define DEFAULT_HASH_SIZE 97
237 struct hash_bucket *next;
240 unsigned char *value;
245 struct hash_bucket *buckets[DEFAULT_HASH_SIZE];
248 /* Default path to dhcpd config file. */
249 #define _PATH_DHCLIENT_CONF "/etc/dhclient.conf"
250 #define _PATH_DHCLIENT_DB "/var/db/dhclient.leases"
251 #define DHCPD_LOG_FACILITY LOG_DAEMON
253 #define MAX_TIME 0x7fffffff
256 /* External definitions... */
259 int cons_options(struct packet *, struct dhcp_packet *, int,
260 struct tree_cache **, int, int, int, u_int8_t *, int);
261 char *pretty_print_option(unsigned int,
262 unsigned char *, int, int, int);
263 void do_packet(struct interface_info *, struct dhcp_packet *,
264 int, unsigned int, struct iaddr, struct hardware *);
267 extern int warnings_occurred;
268 void error(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
269 int warning(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
270 int note(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
271 int debug(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
272 int parse_warn(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
275 extern int lexline, lexchar;
276 extern char *token_line, *tlname;
277 extern char comments[4096];
278 extern int comment_index;
279 extern int eol_token;
280 void new_parse(char *);
281 int next_token(char **, FILE *);
282 int peek_token(char **, FILE *);
285 void skip_to_semi(FILE *);
286 int parse_semi(FILE *);
287 char *parse_string(FILE *);
288 int parse_ip_addr(FILE *, struct iaddr *);
289 void parse_hardware_param(FILE *, struct hardware *);
290 void parse_lease_time(FILE *, time_t *);
291 unsigned char *parse_numeric_aggregate(FILE *, unsigned char *, size_t *,
293 void convert_num(unsigned char *, char *, unsigned, int);
294 time_t parse_date(FILE *);
297 pair cons(caddr_t, pair);
300 struct string_list *new_string_list(size_t size);
301 struct hash_table *new_hash_table(int);
302 struct hash_bucket *new_hash_bucket(void);
305 int if_register_bpf(struct interface_info *, int);
306 void if_register_send(struct interface_info *);
307 void if_register_receive(struct interface_info *);
308 void send_packet_unpriv(int, struct dhcp_packet *, size_t, struct in_addr,
311 void send_packet_priv(struct interface_info *, struct imsg_hdr *, int);
312 ssize_t receive_packet(struct interface_info *, unsigned char *, size_t,
313 struct sockaddr_in *, struct hardware *);
316 extern void (*bootp_packet_handler)(struct interface_info *,
317 struct dhcp_packet *, int, unsigned int, struct iaddr, struct hardware *);
318 void discover_interfaces(struct interface_info *);
319 void reinitialize_interfaces(void);
321 void got_one(struct protocol *);
322 void add_timeout(time_t, void (*)(void *), void *);
323 void cancel_timeout(void (*)(void *), void *);
324 void add_protocol(char *, int, void (*)(struct protocol *), void *);
325 void remove_protocol(struct protocol *);
326 int interface_link_status(char *);
327 void interface_set_mtu_unpriv(int, u_int16_t);
328 void interface_set_mtu_priv(char *, u_int16_t);
331 struct hash_table *new_hash(void);
332 void add_hash(struct hash_table *, unsigned char *, int, unsigned char *);
333 unsigned char *hash_lookup(struct hash_table *, unsigned char *, int);
336 extern struct option dhcp_options[256];
337 extern unsigned char dhcp_option_default_priority_list[];
338 extern int sizeof_dhcp_option_default_priority_list;
339 extern struct hash_table universe_hash;
340 extern struct universe dhcp_universe;
341 void initialize_universes(void);
344 u_int32_t getULong(unsigned char *);
345 int32_t getLong(unsigned char *);
346 u_int16_t getUShort(unsigned char *);
347 int16_t getShort(unsigned char *);
348 void putULong(unsigned char *, u_int32_t);
349 void putLong(unsigned char *, int32_t);
350 void putUShort(unsigned char *, unsigned int);
351 void putShort(unsigned char *, int);
354 struct iaddr subnet_number(struct iaddr, struct iaddr);
355 struct iaddr broadcast_addr(struct iaddr, struct iaddr);
356 int addr_eq(struct iaddr, struct iaddr);
357 char *piaddr(struct iaddr);
360 extern cap_channel_t *capsyslog;
361 extern char *path_dhclient_conf;
362 extern char *path_dhclient_db;
363 extern time_t cur_time;
364 extern int log_priority;
365 extern int log_perror;
367 extern struct client_config top_level_config;
369 extern struct pidfh *pidfile;
371 void dhcpoffer(struct packet *);
372 void dhcpack(struct packet *);
373 void dhcpnak(struct packet *);
375 void send_discover(void *);
376 void send_request(void *);
377 void send_decline(void *);
379 void state_reboot(void *);
380 void state_init(void *);
381 void state_selecting(void *);
382 void state_requesting(void *);
383 void state_bound(void *);
384 void state_panic(void *);
386 void bind_lease(struct interface_info *);
388 void make_discover(struct interface_info *, struct client_lease *);
389 void make_request(struct interface_info *, struct client_lease *);
390 void make_decline(struct interface_info *, struct client_lease *);
392 void free_client_lease(struct client_lease *);
393 void rewrite_client_leases(void);
394 void write_client_lease(struct interface_info *, struct client_lease *, int);
396 void priv_script_init(char *, char *);
397 void priv_script_write_params(char *, struct client_lease *);
398 int priv_script_go(void);
400 void script_init(char *, struct string_list *);
401 void script_write_params(char *, struct client_lease *);
403 void client_envadd(struct client_state *,
404 const char *, const char *, const char *, ...);
405 void script_set_env(struct client_state *, const char *, const char *,
407 void script_flush_env(struct client_state *);
408 int dhcp_option_ev_name(char *, size_t, struct option *);
410 struct client_lease *packet_to_lease(struct packet *);
411 void go_daemon(void);
412 void client_location_changed(void);
414 void bootp(struct packet *);
415 void dhcp(struct packet *);
418 void assemble_hw_header(struct interface_info *, unsigned char *, int *);
419 void assemble_udp_ip_header(unsigned char *, int *, u_int32_t, u_int32_t,
420 unsigned int, unsigned char *, int);
421 ssize_t decode_hw_header(unsigned char *, int, struct hardware *);
422 ssize_t decode_udp_ip_header(unsigned char *, int, struct sockaddr_in *,
423 unsigned char *, int);
426 int read_client_conf(void);
427 void read_client_leases(void);
428 void parse_client_statement(FILE *, struct interface_info *,
429 struct client_config *);
430 unsigned parse_X(FILE *, u_int8_t *, unsigned);
431 int parse_option_list(FILE *, u_int8_t *);
432 void parse_interface_declaration(FILE *, struct client_config *);
433 struct interface_info *interface_or_dummy(char *);
434 void make_client_state(struct interface_info *);
435 void make_client_config(struct interface_info *, struct client_config *);
436 void parse_client_lease_statement(FILE *, int);
437 void parse_client_lease_declaration(FILE *, struct client_lease *,
438 struct interface_info **);
439 struct option *parse_option_decl(FILE *, struct option_data *);
440 void parse_string_list(FILE *, struct string_list **, int);
441 void parse_reject_statement(FILE *, struct client_config *);
444 struct buf *buf_open(size_t);
445 int buf_add(struct buf *, void *, size_t);
446 int buf_close(int, struct buf *);
447 ssize_t buf_read(int, void *, size_t);
448 void dispatch_imsg(struct interface_info *, int);