| 1 | /* $OpenBSD: dhcpd.h,v 1.66 2008/05/09 05:19:14 reyk Exp $ */ |
| 2 | /* $DragonFly: src/sbin/dhclient/dhcpd.h,v 1.1 2008/08/30 16:07:58 hasso Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 2004 Henning Brauer <henning@openbsd.org> |
| 6 | * Copyright (c) 1995, 1996, 1997, 1998, 1999 |
| 7 | * The Internet Software Consortium. All rights reserved. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of The Internet Software Consortium nor the names |
| 19 | * of its contributors may be used to endorse or promote products derived |
| 20 | * from this software without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND |
| 23 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 24 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 26 | * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR |
| 27 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 29 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 30 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 31 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 32 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 33 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * This software has been written for the Internet Software Consortium |
| 37 | * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie |
| 38 | * Enterprises. To learn more about the Internet Software Consortium, |
| 39 | * see ``http://www.vix.com/isc''. To learn more about Vixie |
| 40 | * Enterprises, see ``http://www.vix.com''. |
| 41 | */ |
| 42 | |
| 43 | #include <sys/socket.h> |
| 44 | #include <sys/sockio.h> |
| 45 | #include <sys/stat.h> |
| 46 | #include <sys/time.h> |
| 47 | #include <sys/types.h> |
| 48 | #include <sys/wait.h> |
| 49 | |
| 50 | #include <arpa/inet.h> |
| 51 | #include <net/if.h> |
| 52 | #include <net/if_dl.h> |
| 53 | #include <net/route.h> |
| 54 | #include <netinet/in.h> |
| 55 | |
| 56 | #include <ctype.h> |
| 57 | #include <errno.h> |
| 58 | #include <fcntl.h> |
| 59 | #include <limits.h> |
| 60 | #include <netdb.h> |
| 61 | #include <paths.h> |
| 62 | #include <stdarg.h> |
| 63 | #include <stdio.h> |
| 64 | #include <stdlib.h> |
| 65 | #include <string.h> |
| 66 | #include <syslog.h> |
| 67 | #include <time.h> |
| 68 | #include <unistd.h> |
| 69 | |
| 70 | #include "dhcp.h" |
| 71 | |
| 72 | #define LOCAL_PORT 68 |
| 73 | #define REMOTE_PORT 67 |
| 74 | |
| 75 | struct option { |
| 76 | char *name; |
| 77 | char *format; |
| 78 | }; |
| 79 | |
| 80 | struct option_data { |
| 81 | unsigned int len; |
| 82 | u_int8_t *data; |
| 83 | }; |
| 84 | |
| 85 | struct string_list { |
| 86 | struct string_list *next; |
| 87 | char string[1]; /* Actually bigger. */ |
| 88 | }; |
| 89 | |
| 90 | struct iaddr { |
| 91 | int len; |
| 92 | unsigned char iabuf[16]; |
| 93 | }; |
| 94 | |
| 95 | struct iaddrlist { |
| 96 | struct iaddrlist *next; |
| 97 | struct iaddr addr; |
| 98 | }; |
| 99 | |
| 100 | struct hardware { |
| 101 | u_int8_t htype; |
| 102 | u_int8_t hlen; |
| 103 | u_int8_t haddr[16]; |
| 104 | }; |
| 105 | |
| 106 | struct client_lease { |
| 107 | struct client_lease *next; |
| 108 | time_t expiry, renewal, rebind; |
| 109 | struct iaddr address; |
| 110 | char *server_name; |
| 111 | char *filename; |
| 112 | struct string_list *medium; |
| 113 | unsigned int is_static : 1; |
| 114 | unsigned int is_bootp : 1; |
| 115 | struct option_data options[256]; |
| 116 | }; |
| 117 | |
| 118 | /* Possible states in which the client can be. */ |
| 119 | enum dhcp_state { |
| 120 | S_REBOOTING, |
| 121 | S_INIT, |
| 122 | S_SELECTING, |
| 123 | S_REQUESTING, |
| 124 | S_BOUND, |
| 125 | S_RENEWING, |
| 126 | S_REBINDING |
| 127 | }; |
| 128 | |
| 129 | struct client_config { |
| 130 | struct option_data defaults[256]; |
| 131 | enum { |
| 132 | ACTION_DEFAULT, |
| 133 | ACTION_SUPERSEDE, |
| 134 | ACTION_PREPEND, |
| 135 | ACTION_APPEND |
| 136 | } default_actions[256]; |
| 137 | |
| 138 | struct option_data send_options[256]; |
| 139 | u_int8_t required_options[256]; |
| 140 | u_int8_t requested_options[256]; |
| 141 | int requested_option_count; |
| 142 | time_t timeout; |
| 143 | time_t initial_interval; |
| 144 | time_t link_timeout; |
| 145 | time_t retry_interval; |
| 146 | time_t select_interval; |
| 147 | time_t reboot_timeout; |
| 148 | time_t backoff_cutoff; |
| 149 | struct string_list *media; |
| 150 | char *script_name; |
| 151 | enum { IGNORE, ACCEPT, PREFER } |
| 152 | bootp_policy; |
| 153 | struct string_list *medium; |
| 154 | struct iaddrlist *reject_list; |
| 155 | }; |
| 156 | |
| 157 | struct client_state { |
| 158 | struct client_lease *active; |
| 159 | struct client_lease *new; |
| 160 | struct client_lease *offered_leases; |
| 161 | struct client_lease *leases; |
| 162 | struct client_lease *alias; |
| 163 | enum dhcp_state state; |
| 164 | struct iaddr destination; |
| 165 | u_int32_t xid; |
| 166 | u_int16_t secs; |
| 167 | time_t first_sending; |
| 168 | time_t interval; |
| 169 | struct string_list *medium; |
| 170 | struct dhcp_packet packet; |
| 171 | int packet_length; |
| 172 | struct iaddr requested_address; |
| 173 | char **scriptEnv; |
| 174 | int scriptEnvsize; |
| 175 | }; |
| 176 | |
| 177 | struct interface_info { |
| 178 | struct hardware hw_address; |
| 179 | struct in_addr primary_address; |
| 180 | char name[IFNAMSIZ]; |
| 181 | int rfdesc; |
| 182 | int wfdesc; |
| 183 | int ufdesc; /* unicast */ |
| 184 | unsigned char *rbuf; |
| 185 | size_t rbuf_max; |
| 186 | size_t rbuf_offset; |
| 187 | size_t rbuf_len; |
| 188 | struct ifreq *ifp; |
| 189 | int noifmedia; |
| 190 | int errors; |
| 191 | u_int16_t index; |
| 192 | int linkstat; |
| 193 | }; |
| 194 | |
| 195 | struct timeout { |
| 196 | struct timeout *next; |
| 197 | time_t when; |
| 198 | void (*func)(void); |
| 199 | }; |
| 200 | |
| 201 | #define _PATH_DHCLIENT_CONF "/etc/dhclient.conf" |
| 202 | #define _PATH_DHCLIENT_DB "/var/db/dhclient.leases" |
| 203 | #define _PATH_DHCLIENT_SCRIPT "/sbin/dhclient-script" |
| 204 | #define DHCPD_LOG_FACILITY LOG_DAEMON |
| 205 | |
| 206 | /* External definitions... */ |
| 207 | |
| 208 | extern struct interface_info *ifi; |
| 209 | extern struct client_state *client; |
| 210 | extern struct client_config *config; |
| 211 | |
| 212 | /* options.c */ |
| 213 | int cons_options(unsigned char *, const int, struct option_data *); |
| 214 | char *pretty_print_option(unsigned int, unsigned char *, int, int, int); |
| 215 | void do_packet(int, unsigned int, struct iaddr, struct hardware *); |
| 216 | |
| 217 | /* errwarn.c */ |
| 218 | extern int warnings_occurred; |
| 219 | void error(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); |
| 220 | int warning(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); |
| 221 | int note(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); |
| 222 | int debug(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); |
| 223 | int parse_warn(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); |
| 224 | |
| 225 | /* conflex.c */ |
| 226 | extern int lexline, lexchar; |
| 227 | extern char *token_line, *tlname; |
| 228 | void new_parse(char *); |
| 229 | int next_token(char **, FILE *); |
| 230 | int peek_token(char **, FILE *); |
| 231 | |
| 232 | /* parse.c */ |
| 233 | void skip_to_semi(FILE *); |
| 234 | int parse_semi(FILE *); |
| 235 | char *parse_string(FILE *); |
| 236 | int parse_ip_addr(FILE *, struct iaddr *); |
| 237 | void parse_hardware_param(FILE *, struct hardware *); |
| 238 | void parse_lease_time(FILE *, time_t *); |
| 239 | int parse_numeric_aggregate(FILE *, unsigned char *, int, int, int); |
| 240 | void convert_num(unsigned char *, char *, int, int); |
| 241 | time_t parse_date(FILE *); |
| 242 | |
| 243 | /* bpf.c */ |
| 244 | int if_register_bpf(void); |
| 245 | void if_register_send(void); |
| 246 | void if_register_receive(void); |
| 247 | ssize_t send_packet(struct in_addr, struct sockaddr_in *, struct hardware *); |
| 248 | ssize_t receive_packet(struct sockaddr_in *, struct hardware *); |
| 249 | |
| 250 | /* dispatch.c */ |
| 251 | void discover_interface(void); |
| 252 | void reinitialize_interface(void); |
| 253 | void dispatch(void); |
| 254 | void got_one(void); |
| 255 | void add_timeout(time_t, void (*)(void)); |
| 256 | void cancel_timeout(void (*)(void)); |
| 257 | int interface_status(char *); |
| 258 | int interface_link_status(char *); |
| 259 | int interface_link_forceup(char *); |
| 260 | void interface_link_forcedown(char *); |
| 261 | |
| 262 | /* tables.c */ |
| 263 | extern const struct option dhcp_options[256]; |
| 264 | |
| 265 | /* convert.c */ |
| 266 | u_int32_t getULong(unsigned char *); |
| 267 | int32_t getLong(unsigned char *); |
| 268 | u_int16_t getUShort(unsigned char *); |
| 269 | int16_t getShort(unsigned char *); |
| 270 | void putULong(unsigned char *, u_int32_t); |
| 271 | void putLong(unsigned char *, int32_t); |
| 272 | void putUShort(unsigned char *, unsigned int); |
| 273 | void putShort(unsigned char *, int); |
| 274 | |
| 275 | /* inet.c */ |
| 276 | struct iaddr subnet_number(struct iaddr, struct iaddr); |
| 277 | struct iaddr broadcast_addr(struct iaddr, struct iaddr); |
| 278 | int addr_eq(struct iaddr, struct iaddr); |
| 279 | char *piaddr(struct iaddr); |
| 280 | |
| 281 | /* dhclient.c */ |
| 282 | extern char *path_dhclient_conf; |
| 283 | extern char *path_dhclient_db; |
| 284 | extern time_t cur_time; |
| 285 | extern int log_perror; |
| 286 | extern int routefd; |
| 287 | |
| 288 | void dhcpoffer(struct iaddr, struct option_data *); |
| 289 | void dhcpack(struct iaddr, struct option_data *); |
| 290 | void dhcpnak(struct iaddr, struct option_data *); |
| 291 | |
| 292 | void send_discover(void); |
| 293 | void send_request(void); |
| 294 | void send_decline(void); |
| 295 | |
| 296 | void state_reboot(void); |
| 297 | void state_init(void); |
| 298 | void state_selecting(void); |
| 299 | void state_bound(void); |
| 300 | void state_panic(void); |
| 301 | |
| 302 | void bind_lease(void); |
| 303 | |
| 304 | void make_discover(struct client_lease *); |
| 305 | void make_request(struct client_lease *); |
| 306 | void make_decline(struct client_lease *); |
| 307 | |
| 308 | void free_client_lease(struct client_lease *); |
| 309 | void rewrite_client_leases(void); |
| 310 | void write_client_lease(struct client_lease *, int); |
| 311 | |
| 312 | void priv_script_init(char *, char *); |
| 313 | void priv_script_write_params(char *, struct client_lease *); |
| 314 | int priv_script_go(void); |
| 315 | |
| 316 | void script_init(char *, struct string_list *); |
| 317 | void script_write_params(char *, struct client_lease *); |
| 318 | int script_go(void); |
| 319 | void script_set_env(const char *, const char *, const char *); |
| 320 | void script_flush_env(void); |
| 321 | int dhcp_option_ev_name(char *, size_t, const struct option *); |
| 322 | |
| 323 | struct client_lease *packet_to_lease(struct option_data *); |
| 324 | void go_daemon(void); |
| 325 | |
| 326 | void routehandler(void); |
| 327 | |
| 328 | /* packet.c */ |
| 329 | void assemble_hw_header(unsigned char *, int *, struct hardware *); |
| 330 | void assemble_udp_ip_header(unsigned char *, int *, u_int32_t, u_int32_t, |
| 331 | unsigned int, unsigned char *, int); |
| 332 | ssize_t decode_hw_header(unsigned char *, int, struct hardware *); |
| 333 | ssize_t decode_udp_ip_header(unsigned char *, int, struct sockaddr_in *, |
| 334 | unsigned char *, int); |
| 335 | |
| 336 | /* clparse.c */ |
| 337 | int read_client_conf(void); |
| 338 | void read_client_leases(void); |
| 339 | void parse_client_statement(FILE *); |
| 340 | int parse_X(FILE *, u_int8_t *, int); |
| 341 | int parse_option_list(FILE *, u_int8_t *); |
| 342 | void parse_interface_declaration(FILE *); |
| 343 | void parse_client_lease_statement(FILE *, int); |
| 344 | void parse_client_lease_declaration(FILE *, struct client_lease *); |
| 345 | int parse_option_decl(FILE *, struct option_data *); |
| 346 | void parse_string_list(FILE *, struct string_list **, int); |
| 347 | void parse_reject_statement(FILE *); |