1 /* $OpenBSD: src/sbin/dhclient/dhcpd.h,v 1.76 2012/07/09 16:21:21 krw 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 42 #include <sys/socket.h> 43 #include <sys/sockio.h> 44 #include <sys/stat.h> 45 #include <sys/time.h> 46 #include <sys/types.h> 47 #include <sys/wait.h> 48 49 #include <arpa/inet.h> 50 #include <net/if.h> 51 #include <net/if_dl.h> 52 #include <net/route.h> 53 #include <netinet/in.h> 54 #include <netinet/if_ether.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 unsigned int is_static : 1; 113 unsigned int is_bootp : 1; 114 struct option_data options[256]; 115 }; 116 117 /* Possible states in which the client can be. */ 118 enum dhcp_state { 119 S_REBOOTING, 120 S_INIT, 121 S_SELECTING, 122 S_REQUESTING, 123 S_BOUND, 124 S_RENEWING, 125 S_REBINDING 126 }; 127 128 struct client_config { 129 struct option_data defaults[256]; 130 enum { 131 ACTION_DEFAULT, 132 ACTION_SUPERSEDE, 133 ACTION_PREPEND, 134 ACTION_APPEND 135 } default_actions[256]; 136 137 struct option_data send_options[256]; 138 u_int8_t required_options[256]; 139 u_int8_t requested_options[256]; 140 int requested_option_count; 141 time_t timeout; 142 time_t initial_interval; 143 time_t link_timeout; 144 time_t retry_interval; 145 time_t select_interval; 146 time_t reboot_timeout; 147 time_t backoff_cutoff; 148 char *script_name; 149 enum { IGNORE, ACCEPT, PREFER } 150 bootp_policy; 151 struct iaddrlist *reject_list; 152 }; 153 154 struct client_state { 155 struct client_lease *active; 156 struct client_lease *new; 157 struct client_lease *offered_leases; 158 struct client_lease *leases; 159 enum dhcp_state state; 160 struct iaddr destination; 161 u_int32_t xid; 162 u_int16_t secs; 163 time_t first_sending; 164 time_t interval; 165 struct dhcp_packet packet; 166 int packet_length; 167 struct iaddr requested_address; 168 char **scriptEnv; 169 int scriptEnvsize; 170 }; 171 172 struct interface_info { 173 struct hardware hw_address; 174 struct in_addr primary_address; 175 char name[IFNAMSIZ]; 176 int rfdesc; 177 int wfdesc; 178 int ufdesc; /* unicast */ 179 unsigned char *rbuf; 180 size_t rbuf_max; 181 size_t rbuf_offset; 182 size_t rbuf_len; 183 struct ifreq *ifp; 184 int noifmedia; 185 int errors; 186 u_int16_t index; 187 int linkstat; 188 }; 189 190 struct timeout { 191 struct timeout *next; 192 time_t when; 193 void (*func)(void); 194 }; 195 196 #define _PATH_DHCLIENT_CONF "/etc/dhclient.conf" 197 #define _PATH_DHCLIENT_DB "/var/db/dhclient.leases" 198 #define _PATH_DHCLIENT_SCRIPT "/sbin/dhclient-script" 199 #define DHCPD_LOG_FACILITY LOG_DAEMON 200 201 /* External definitions... */ 202 203 extern struct interface_info *ifi; 204 extern struct client_state *client; 205 extern struct client_config *config; 206 207 /* options.c */ 208 int cons_options(struct option_data *); 209 char *pretty_print_option(unsigned int, unsigned char *, int, int, int); 210 void do_packet(int, unsigned int, struct iaddr, struct hardware *); 211 212 /* errwarn.c */ 213 extern int warnings_occurred; 214 void error(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 215 int warning(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 216 int note(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 217 #ifdef DEBUG 218 int debug(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 219 #endif 220 int parse_warn(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); 221 222 /* conflex.c */ 223 extern int lexline, lexchar; 224 extern char *token_line, *tlname; 225 void new_parse(char *); 226 int next_token(char **, FILE *); 227 int peek_token(char **, FILE *); 228 229 /* parse.c */ 230 void skip_to_semi(FILE *); 231 int parse_semi(FILE *); 232 char *parse_string(FILE *); 233 int parse_ip_addr(FILE *, struct iaddr *); 234 void parse_hardware_param(FILE *, struct hardware *); 235 void parse_lease_time(FILE *, time_t *); 236 int parse_numeric_aggregate(FILE *, unsigned char *, int, int, int); 237 void convert_num(unsigned char *, char *, int, int); 238 time_t parse_date(FILE *); 239 240 /* bpf.c */ 241 int if_register_bpf(void); 242 void if_register_send(void); 243 void if_register_receive(void); 244 ssize_t send_packet(struct in_addr, struct sockaddr_in *, struct hardware *); 245 ssize_t receive_packet(struct sockaddr_in *, struct hardware *); 246 247 /* dispatch.c */ 248 void discover_interface(void); 249 void reinitialize_interface(void); 250 void dispatch(void); 251 void got_one(void); 252 void set_timeout(time_t, void (*)(void)); 253 void cancel_timeout(void); 254 int interface_status(char *); 255 int interface_link_forceup(char *); 256 257 /* tables.c */ 258 extern const struct option dhcp_options[256]; 259 260 /* convert.c */ 261 u_int32_t getULong(unsigned char *); 262 int32_t getLong(unsigned char *); 263 u_int16_t getUShort(unsigned char *); 264 int16_t getShort(unsigned char *); 265 void putULong(unsigned char *, u_int32_t); 266 void putLong(unsigned char *, int32_t); 267 void putUShort(unsigned char *, unsigned int); 268 void putShort(unsigned char *, int); 269 270 /* inet.c */ 271 struct iaddr subnet_number(struct iaddr, struct iaddr); 272 struct iaddr broadcast_addr(struct iaddr, struct iaddr); 273 int addr_eq(struct iaddr, struct iaddr); 274 char *piaddr(struct iaddr); 275 276 /* dhclient.c */ 277 extern char *path_dhclient_conf; 278 extern char *path_dhclient_db; 279 extern time_t cur_time; 280 extern int log_perror; 281 extern int routefd; 282 283 void dhcpoffer(struct iaddr, struct option_data *); 284 void dhcpack(struct iaddr, struct option_data *); 285 void dhcpnak(struct iaddr, struct option_data *); 286 287 void send_discover(void); 288 void send_request(void); 289 void send_decline(void); 290 291 void state_reboot(void); 292 void state_init(void); 293 void state_selecting(void); 294 void state_bound(void); 295 void state_panic(void); 296 297 void bind_lease(void); 298 299 void make_discover(struct client_lease *); 300 void make_request(struct client_lease *); 301 void make_decline(struct client_lease *); 302 303 void free_client_lease(struct client_lease *); 304 void rewrite_client_leases(void); 305 void write_client_lease(struct client_lease *); 306 307 void priv_script_init(char *); 308 void priv_script_write_params(char *, struct client_lease *); 309 int priv_script_go(void); 310 311 void script_init(char *); 312 void script_write_params(char *, struct client_lease *); 313 int script_go(void); 314 void script_set_env(const char *, const char *, const char *); 315 void script_flush_env(void); 316 int dhcp_option_ev_name(char *, size_t, const struct option *); 317 318 struct client_lease *packet_to_lease(struct option_data *); 319 void go_daemon(void); 320 321 void routehandler(void); 322 323 /* packet.c */ 324 void assemble_hw_header(unsigned char *, int *, struct hardware *); 325 void assemble_udp_ip_header(unsigned char *, int *, u_int32_t, u_int32_t, 326 unsigned int, unsigned char *, int); 327 ssize_t decode_hw_header(unsigned char *, int, struct hardware *); 328 ssize_t decode_udp_ip_header(unsigned char *, int, struct sockaddr_in *, 329 unsigned char *, int); 330 331 /* clparse.c */ 332 int read_client_conf(void); 333 void read_client_leases(void); 334 void parse_client_statement(FILE *); 335 int parse_X(FILE *, u_int8_t *, int); 336 int parse_option_list(FILE *, u_int8_t *); 337 void parse_interface_declaration(FILE *); 338 void parse_client_lease_statement(FILE *, int); 339 void parse_client_lease_declaration(FILE *, struct client_lease *); 340 int parse_option_decl(FILE *, struct option_data *); 341 void parse_string_list(FILE *, struct string_list **, int); 342 void parse_reject_statement(FILE *); 343