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 *); 348