sbin/dhclient/dhcpd.h

   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 *);