1 /* $OpenBSD: dhcpd.h,v 1.33 2004/05/06 22:29:15 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Henning Brauer <henning@openbsd.org> 5 * Copyright (c) 1995, 1996, 1997, 1998, 1999 6 * The Internet Software Consortium. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of The Internet Software Consortium nor the names 18 * of its contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND 22 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 23 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 25 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR 26 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 30 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * This software has been written for the Internet Software Consortium 36 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie 37 * Enterprises. To learn more about the Internet Software Consortium, 38 * see ``http://www.vix.com/isc''. To learn more about Vixie 39 * Enterprises, see ``http://www.vix.com''. 40 * 41 * $FreeBSD$ 42 */ 43 44 #include <sys/types.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 <limits.h> 64 #include <netdb.h> 65 #include <paths.h> 66 #include <unistd.h> 67 #include <stdarg.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <syslog.h> 72 #include <time.h> 73 #include <unistd.h> 74 75 #include "dhcp.h" 76 #include "tree.h" 77 78 #define LOCAL_PORT 68 79 #define REMOTE_PORT 67 80 81 struct option_data { 82 int len; 83 u_int8_t *data; 84 }; 85 86 struct string_list { 87 struct string_list *next; 88 char *string; 89 }; 90 91 struct iaddr { 92 int len; 93 unsigned char iabuf[16]; 94 }; 95 96 struct iaddrlist { 97 struct iaddrlist *next; 98 struct iaddr addr; 99 }; 100 101 struct packet { 102 struct dhcp_packet *raw; 103 int packet_length; 104 int packet_type; 105 int options_valid; 106 int client_port; 107 struct iaddr client_addr; 108 struct interface_info *interface; 109 struct hardware *haddr; 110 struct option_data options[256]; 111 }; 112 113 struct hardware { 114 u_int8_t htype; 115 u_int8_t hlen; 116 u_int8_t haddr[16]; 117 }; 118 119 struct client_lease { 120 struct client_lease *next; 121 time_t expiry, renewal, rebind; 122 struct iaddr address; 123 char *server_name; 124 char *filename; 125 struct string_list *medium; 126 unsigned int is_static : 1; 127 unsigned int is_bootp : 1; 128 struct option_data options[256]; 129 }; 130 131 /* Possible states in which the client can be. */ 132 enum dhcp_state { 133 S_REBOOTING, 134 S_INIT, 135 S_SELECTING, 136 S_REQUESTING, 137 S_BOUND, 138 S_RENEWING, 139 S_REBINDING 140 }; 141 142 struct client_config { 143 struct option_data defaults[256]; 144 enum { 145 ACTION_DEFAULT, 146 ACTION_SUPERSEDE, 147 ACTION_PREPEND, 148 ACTION_APPEND 149 } default_actions[256]; 150 151 struct option_data send_options[256]; 152 u_int8_t required_options[256]; 153 u_int8_t requested_options[256]; 154 int requested_option_count; 155 time_t timeout; 156 time_t initial_interval; 157 time_t retry_interval; 158 time_t select_interval; 159 time_t reboot_timeout; 160 time_t backoff_cutoff; 161 struct string_list *media; 162 char *script_name; 163 enum { IGNORE, ACCEPT, PREFER } 164 bootp_policy; 165 struct string_list *medium; 166 struct iaddrlist *reject_list; 167 }; 168 169 struct client_state { 170 struct client_lease *active; 171 struct client_lease *new; 172 struct client_lease *offered_leases; 173 struct client_lease *leases; 174 struct client_lease *alias; 175 enum dhcp_state state; 176 struct iaddr destination; 177 u_int32_t xid; 178 u_int16_t secs; 179 time_t first_sending; 180 time_t interval; 181 struct string_list *medium; 182 struct dhcp_packet packet; 183 int packet_length; 184 struct iaddr requested_address; 185 struct client_config *config; 186 char **scriptEnv; 187 int scriptEnvsize; 188 struct string_list *env; 189 int envc; 190 }; 191 192 struct interface_info { 193 struct interface_info *next; 194 struct hardware hw_address; 195 struct in_addr primary_address; 196 char name[IFNAMSIZ]; 197 int rfdesc; 198 int wfdesc; 199 int ufdesc; 200 unsigned char *rbuf; 201 size_t rbuf_max; 202 size_t rbuf_offset; 203 size_t rbuf_len; 204 struct ifreq *ifp; 205 struct client_state *client; 206 int noifmedia; 207 int errors; 208 int dead; 209 u_int16_t index; 210 }; 211 212 struct timeout { 213 struct timeout *next; 214 time_t when; 215 void (*func)(void *); 216 void *what; 217 }; 218 219 struct protocol { 220 struct protocol *next; 221 int fd; 222 void (*handler)(struct protocol *); 223 void *local; 224 }; 225 226 #define DEFAULT_HASH_SIZE 97 227 228 struct hash_bucket { 229 struct hash_bucket *next; 230 unsigned char *name; 231 int len; 232 unsigned char *value; 233 }; 234 235 struct hash_table { 236 int hash_count; 237 struct hash_bucket *buckets[DEFAULT_HASH_SIZE]; 238 }; 239 240 /* Default path to dhcpd config file. */ 241 #define _PATH_DHCLIENT_CONF "/etc/dhclient.conf" 242 #define _PATH_DHCLIENT_DB "/var/db/dhclient.leases" 243 #define DHCPD_LOG_FACILITY LOG_DAEMON 244 245 #define MAX_TIME 0x7fffffff 246 #define MIN_TIME 0 247 248 /* External definitions... */ 249 250 /* options.c */ 251 int cons_options(struct packet *, struct dhcp_packet *, int, 252 struct tree_cache **, int, int, int, u_int8_t *, int); 253 char *pretty_print_option(unsigned int, 254 unsigned char *, int, int, int); 255 void do_packet(struct interface_info *, struct dhcp_packet *, 256 int, unsigned int, struct iaddr, struct hardware *); 257 258 /* errwarn.c */ 259 extern int warnings_occurred; 260 void error(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 261 int warning(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 262 int note(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 263 int debug(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 264 int parse_warn(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 265 266 /* conflex.c */ 267 extern int lexline, lexchar; 268 extern char *token_line, *tlname; 269 extern char comments[4096]; 270 extern int comment_index; 271 extern int eol_token; 272 void new_parse(char *); 273 int next_token(char **, FILE *); 274 int peek_token(char **, FILE *); 275 276 /* parse.c */ 277 void skip_to_semi(FILE *); 278 int parse_semi(FILE *); 279 char *parse_string(FILE *); 280 int parse_ip_addr(FILE *, struct iaddr *); 281 void parse_hardware_param(FILE *, struct hardware *); 282 void parse_lease_time(FILE *, time_t *); 283 unsigned char *parse_numeric_aggregate(FILE *, unsigned char *, int *, 284 int, int, int); 285 void convert_num(unsigned char *, char *, int, int); 286 time_t parse_date(FILE *); 287 288 /* tree.c */ 289 pair cons(caddr_t, pair); 290 291 /* alloc.c */ 292 struct string_list *new_string_list(size_t size); 293 struct hash_table *new_hash_table(int); 294 struct hash_bucket *new_hash_bucket(void); 295 296 /* bpf.c */ 297 int if_register_bpf(struct interface_info *); 298 void if_register_send(struct interface_info *); 299 void if_register_receive(struct interface_info *); 300 ssize_t send_packet(struct interface_info *, struct dhcp_packet *, size_t, 301 struct in_addr, struct sockaddr_in *, struct hardware *); 302 ssize_t receive_packet(struct interface_info *, unsigned char *, size_t, 303 struct sockaddr_in *, struct hardware *); 304 305 /* dispatch.c */ 306 extern void (*bootp_packet_handler)(struct interface_info *, 307 struct dhcp_packet *, int, unsigned int, struct iaddr, struct hardware *); 308 void discover_interfaces(struct interface_info *); 309 void reinitialize_interfaces(void); 310 void dispatch(void); 311 void got_one(struct protocol *); 312 void add_timeout(time_t, void (*)(void *), void *); 313 void cancel_timeout(void (*)(void *), void *); 314 void add_protocol(char *, int, void (*)(struct protocol *), void *); 315 void remove_protocol(struct protocol *); 316 int interface_link_status(char *); 317 318 /* hash.c */ 319 struct hash_table *new_hash(void); 320 void add_hash(struct hash_table *, unsigned char *, int, unsigned char *); 321 unsigned char *hash_lookup(struct hash_table *, unsigned char *, int); 322 323 /* tables.c */ 324 extern struct option dhcp_options[256]; 325 extern unsigned char dhcp_option_default_priority_list[]; 326 extern int sizeof_dhcp_option_default_priority_list; 327 extern struct hash_table universe_hash; 328 extern struct universe dhcp_universe; 329 void initialize_universes(void); 330 331 /* convert.c */ 332 u_int32_t getULong(unsigned char *); 333 int32_t getLong(unsigned char *); 334 u_int16_t getUShort(unsigned char *); 335 int16_t getShort(unsigned char *); 336 void putULong(unsigned char *, u_int32_t); 337 void putLong(unsigned char *, int32_t); 338 void putUShort(unsigned char *, unsigned int); 339 void putShort(unsigned char *, int); 340 341 /* inet.c */ 342 struct iaddr subnet_number(struct iaddr, struct iaddr); 343 struct iaddr broadcast_addr(struct iaddr, struct iaddr); 344 int addr_eq(struct iaddr, struct iaddr); 345 char *piaddr(struct iaddr); 346 347 /* dhclient.c */ 348 extern char *path_dhclient_conf; 349 extern char *path_dhclient_db; 350 extern time_t cur_time; 351 extern int log_priority; 352 extern int log_perror; 353 354 extern struct client_config top_level_config; 355 356 void dhcpoffer(struct packet *); 357 void dhcpack(struct packet *); 358 void dhcpnak(struct packet *); 359 360 void send_discover(void *); 361 void send_request(void *); 362 void send_decline(void *); 363 364 void state_reboot(void *); 365 void state_init(void *); 366 void state_selecting(void *); 367 void state_requesting(void *); 368 void state_bound(void *); 369 void state_panic(void *); 370 371 void bind_lease(struct interface_info *); 372 373 void make_discover(struct interface_info *, struct client_lease *); 374 void make_request(struct interface_info *, struct client_lease *); 375 void make_decline(struct interface_info *, struct client_lease *); 376 377 void free_client_lease(struct client_lease *); 378 void rewrite_client_leases(void); 379 void write_client_lease(struct interface_info *, struct client_lease *, int); 380 381 void priv_script_init(char *, char *); 382 void priv_script_write_params(char *, struct client_lease *); 383 int priv_script_go(void); 384 385 void script_init(char *, struct string_list *); 386 void script_write_params(char *, struct client_lease *); 387 int script_go(void); 388 void client_envadd(struct client_state *, 389 const char *, const char *, const char *, ...); 390 void script_set_env(struct client_state *, const char *, const char *, 391 const char *); 392 void script_flush_env(struct client_state *); 393 int dhcp_option_ev_name(char *, size_t, struct option *); 394 395 struct client_lease *packet_to_lease(struct packet *); 396 void go_daemon(void); 397 void client_location_changed(void); 398 399 void bootp(struct packet *); 400 void dhcp(struct packet *); 401 402 /* packet.c */ 403 void assemble_hw_header(struct interface_info *, unsigned char *, 404 int *, struct hardware *); 405 void assemble_udp_ip_header(unsigned char *, int *, u_int32_t, u_int32_t, 406 unsigned int, unsigned char *, int); 407 ssize_t decode_hw_header(unsigned char *, int, struct hardware *); 408 ssize_t decode_udp_ip_header(unsigned char *, int, struct sockaddr_in *, 409 unsigned char *, int); 410 411 /* ethernet.c */ 412 void assemble_ethernet_header(struct interface_info *, unsigned char *, 413 int *, struct hardware *); 414 ssize_t decode_ethernet_header(struct interface_info *, unsigned char *, 415 int, struct hardware *); 416 417 /* clparse.c */ 418 int read_client_conf(void); 419 void read_client_leases(void); 420 void parse_client_statement(FILE *, struct interface_info *, 421 struct client_config *); 422 int parse_X(FILE *, u_int8_t *, int); 423 int parse_option_list(FILE *, u_int8_t *); 424 void parse_interface_declaration(FILE *, struct client_config *); 425 struct interface_info *interface_or_dummy(char *); 426 void make_client_state(struct interface_info *); 427 void make_client_config(struct interface_info *, struct client_config *); 428 void parse_client_lease_statement(FILE *, int); 429 void parse_client_lease_declaration(FILE *, struct client_lease *, 430 struct interface_info **); 431 struct option *parse_option_decl(FILE *, struct option_data *); 432 void parse_string_list(FILE *, struct string_list **, int); 433 void parse_reject_statement(FILE *, struct client_config *); 434 435 /* privsep.c */ 436 struct buf *buf_open(size_t); 437 int buf_add(struct buf *, void *, size_t); 438 int buf_close(int, struct buf *); 439 ssize_t buf_read(int, void *, size_t); 440 void dispatch_imsg(int); 441