1 /* $OpenBSD: dhcpd.h,v 1.33 2004/05/06 22:29:15 deraadt Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 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. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 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. 22 * 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 35 * SUCH DAMAGE. 36 * 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''. 42 */ 43 44 #include <sys/param.h> 45 46 #include <sys/socket.h> 47 #include <sys/sockio.h> 48 #include <sys/stat.h> 49 #include <sys/time.h> 50 #include <sys/un.h> 51 #include <sys/wait.h> 52 53 #include <net/if.h> 54 #include <net/if_dl.h> 55 #include <net/route.h> 56 57 #include <netinet/in.h> 58 #include <arpa/inet.h> 59 60 #include <ctype.h> 61 #include <errno.h> 62 #include <fcntl.h> 63 #include <libutil.h> 64 #include <limits.h> 65 #include <netdb.h> 66 #include <paths.h> 67 #include <unistd.h> 68 #include <stdarg.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 #include <syslog.h> 73 #include <time.h> 74 #include <unistd.h> 75 76 #include <libcasper.h> 77 #include <casper/cap_syslog.h> 78 79 #include "dhcp.h" 80 #include "tree.h" 81 82 #define LOCAL_PORT 68 83 #define REMOTE_PORT 67 84 85 struct option_data { 86 size_t len; 87 u_int8_t *data; 88 }; 89 90 struct string_list { 91 struct string_list *next; 92 char *string; 93 }; 94 95 struct iaddr { 96 size_t len; 97 unsigned char iabuf[16]; 98 }; 99 100 struct iaddrlist { 101 struct iaddrlist *next; 102 struct iaddr addr; 103 }; 104 105 struct packet { 106 struct dhcp_packet *raw; 107 int packet_length; 108 int packet_type; 109 int options_valid; 110 int client_port; 111 struct iaddr client_addr; 112 struct interface_info *interface; 113 struct hardware *haddr; 114 struct option_data options[256]; 115 }; 116 117 struct hardware { 118 u_int8_t htype; 119 u_int8_t hlen; 120 u_int8_t haddr[16]; 121 }; 122 123 struct client_lease { 124 struct client_lease *next; 125 time_t expiry, renewal, rebind; 126 struct iaddr address; 127 struct iaddr nextserver; 128 char *server_name; 129 char *filename; 130 struct string_list *medium; 131 unsigned int is_static : 1; 132 unsigned int is_bootp : 1; 133 struct option_data options[256]; 134 }; 135 136 /* Possible states in which the client can be. */ 137 enum dhcp_state { 138 S_REBOOTING, 139 S_INIT, 140 S_SELECTING, 141 S_REQUESTING, 142 S_BOUND, 143 S_RENEWING, 144 S_REBINDING 145 }; 146 147 struct client_config { 148 struct option_data defaults[256]; 149 enum { 150 ACTION_DEFAULT, 151 ACTION_SUPERSEDE, 152 ACTION_PREPEND, 153 ACTION_APPEND 154 } default_actions[256]; 155 156 struct option_data send_options[256]; 157 u_int8_t required_options[256]; 158 u_int8_t requested_options[256]; 159 int requested_option_count; 160 u_int8_t ignored_options[256]; 161 u_int vlan_pcp; 162 time_t timeout; 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; 169 char *script_name; 170 enum { IGNORE, ACCEPT, PREFER } 171 bootp_policy; 172 struct string_list *medium; 173 struct iaddrlist *reject_list; 174 }; 175 176 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; 184 u_int32_t xid; 185 u_int16_t secs; 186 time_t first_sending; 187 time_t interval; 188 struct string_list *medium; 189 struct dhcp_packet packet; 190 int packet_length; 191 struct iaddr requested_address; 192 struct client_config *config; 193 char **scriptEnv; 194 int scriptEnvsize; 195 struct string_list *env; 196 int envc; 197 }; 198 199 struct interface_info { 200 struct interface_info *next; 201 struct hardware hw_address; 202 char name[IFNAMSIZ]; 203 int rfdesc; 204 int wfdesc; 205 int ufdesc; 206 unsigned char *rbuf; 207 size_t rbuf_max; 208 size_t rbuf_offset; 209 size_t rbuf_len; 210 struct ifreq *ifp; 211 struct client_state *client; 212 int noifmedia; 213 int errors; 214 int dead; 215 u_int16_t index; 216 int linkstat; 217 }; 218 219 struct timeout { 220 struct timeout *next; 221 time_t when; 222 void (*func)(void *); 223 void *what; 224 }; 225 226 struct protocol { 227 struct protocol *next; 228 int fd; 229 void (*handler)(struct protocol *); 230 void *local; 231 }; 232 233 #define DEFAULT_HASH_SIZE 97 234 235 struct hash_bucket { 236 struct hash_bucket *next; 237 const unsigned char *name; 238 int len; 239 unsigned char *value; 240 }; 241 242 struct hash_table { 243 int hash_count; 244 struct hash_bucket *buckets[DEFAULT_HASH_SIZE]; 245 }; 246 247 /* Default path to dhcpd config file. */ 248 #define _PATH_DHCLIENT_CONF "/etc/dhclient.conf" 249 #define _PATH_DHCLIENT_DB "/var/db/dhclient.leases" 250 #define DHCPD_LOG_FACILITY LOG_DAEMON 251 252 #define MAX_TIME 0x7fffffff 253 #define MIN_TIME 0 254 255 /* External definitions... */ 256 257 /* options.c */ 258 int cons_options(struct packet *, struct dhcp_packet *, int, 259 struct tree_cache **, int, int, int, u_int8_t *, int); 260 const char *pretty_print_option(unsigned int, 261 unsigned char *, int, int, int); 262 void do_packet(struct interface_info *, struct dhcp_packet *, 263 int, unsigned int, struct iaddr, struct hardware *); 264 265 /* errwarn.c */ 266 extern int warnings_occurred; 267 void error(const char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))) __dead2; 268 int warning(const char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 269 int note(const char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 270 int debug(const char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 271 int parse_warn(const char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 272 273 /* conflex.c */ 274 extern int lexline, lexchar; 275 extern char *token_line; 276 extern const char *tlname; 277 extern char comments[4096]; 278 extern int comment_index; 279 extern int eol_token; 280 void new_parse(const char *); 281 int next_token(char **, FILE *); 282 int peek_token(char **, FILE *); 283 284 /* parse.c */ 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 *, 292 int, unsigned, int); 293 void convert_num(unsigned char *, char *, unsigned, int); 294 time_t parse_date(FILE *); 295 296 /* tree.c */ 297 pair cons(caddr_t, pair); 298 299 /* alloc.c */ 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); 303 304 /* bpf.c */ 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, 309 struct in_addr); 310 struct imsg_hdr; 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 *); 314 315 /* dispatch.c */ 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); 320 void dispatch(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(const 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); 329 330 /* hash.c */ 331 struct hash_table *new_hash(void); 332 void add_hash(struct hash_table *, const unsigned char *, int, unsigned char *); 333 void *hash_lookup(struct hash_table *, unsigned char *, int); 334 335 /* tables.c */ 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); 342 343 /* convert.c */ 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); 352 353 /* inet.c */ 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); 358 359 /* dhclient.c */ 360 extern cap_channel_t *capsyslog; 361 extern const 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; 366 367 extern struct client_config top_level_config; 368 369 extern struct pidfh *pidfile; 370 371 extern struct interface_info *ifi; 372 373 void dhcpoffer(struct packet *); 374 void dhcpack(struct packet *); 375 void dhcpnak(struct packet *); 376 377 void send_discover(void *); 378 void send_request(void *); 379 void send_decline(void *); 380 381 void state_reboot(void *); 382 void state_init(void *); 383 void state_selecting(void *); 384 void state_requesting(void *); 385 void state_bound(void *); 386 void state_panic(void *); 387 388 void bind_lease(struct interface_info *); 389 390 void make_discover(struct interface_info *, struct client_lease *); 391 void make_request(struct interface_info *, struct client_lease *); 392 void make_decline(struct interface_info *, struct client_lease *); 393 394 void free_client_lease(struct client_lease *); 395 void rewrite_client_leases(void); 396 void write_client_lease(struct interface_info *, struct client_lease *, int); 397 398 void priv_script_init(const char *, char *); 399 void priv_script_write_params(const char *, struct client_lease *); 400 int priv_script_go(void); 401 402 void script_init(const char *, struct string_list *); 403 void script_write_params(const char *, struct client_lease *); 404 int script_go(void); 405 void client_envadd(struct client_state *, 406 const char *, const char *, const char *, ...); 407 void script_set_env(struct client_state *, const char *, const char *, 408 const char *); 409 void script_flush_env(struct client_state *); 410 int dhcp_option_ev_name(char *, size_t, struct option *); 411 412 struct client_lease *packet_to_lease(struct packet *); 413 void go_daemon(void); 414 void client_location_changed(void); 415 416 void bootp(struct packet *); 417 void dhcp(struct packet *); 418 419 /* packet.c */ 420 void assemble_hw_header(struct interface_info *, unsigned char *, int *); 421 void assemble_udp_ip_header(unsigned char *, int *, u_int32_t, u_int32_t, 422 unsigned int, unsigned char *, int); 423 ssize_t decode_hw_header(unsigned char *, int, struct hardware *); 424 ssize_t decode_udp_ip_header(unsigned char *, int, struct sockaddr_in *, 425 unsigned char *, int); 426 427 /* clparse.c */ 428 int read_client_conf(void); 429 void read_client_leases(void); 430 void parse_client_statement(FILE *, struct interface_info *, 431 struct client_config *); 432 unsigned parse_X(FILE *, u_int8_t *, unsigned); 433 int parse_option_list(FILE *, u_int8_t *); 434 void parse_interface_declaration(FILE *, struct client_config *); 435 struct interface_info *interface_or_dummy(char *); 436 void make_client_state(struct interface_info *); 437 void make_client_config(struct interface_info *, struct client_config *); 438 void parse_client_lease_statement(FILE *, int); 439 void parse_client_lease_declaration(FILE *, struct client_lease *, 440 struct interface_info **); 441 struct option *parse_option_decl(FILE *, struct option_data *); 442 void parse_string_list(FILE *, struct string_list **, int); 443 void parse_reject_statement(FILE *, struct client_config *); 444 445 /* privsep.c */ 446 struct buf *buf_open(size_t); 447 int buf_add(struct buf *, const void *, size_t); 448 int buf_close(int, struct buf *); 449 ssize_t buf_read(int, void *, size_t); 450 void dispatch_imsg(struct interface_info *, int); 451