sbin/dhclient/dhcpd.h

   1 /*      $OpenBSD: src/sbin/dhclient/dhcpd.h,v 1.82 2012/10/27 23:08:53 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_IGNORE,
 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         char                    *script_name;
 150         enum { IGNORE, ACCEPT, PREFER }
 151                                  bootp_policy;
 152         struct iaddrlist        *reject_list;
 153 };
 154
 155 struct client_state {
 156         struct client_lease      *active;
 157         struct client_lease      *new;
 158         struct client_lease      *offered_leases;
 159         struct client_lease      *leases;
 160         enum dhcp_state           state;
 161         struct iaddr              destination;
 162         u_int32_t                 xid;
 163         u_int16_t                 secs;
 164         time_t                    first_sending;
 165         time_t                    interval;
 166         struct dhcp_packet        packet;
 167         int                       packet_length;
 168         struct iaddr              requested_address;
 169         char                    **scriptEnv;
 170         int                       scriptEnvsize;
 171 };
 172
 173 struct interface_info {
 174         struct hardware          hw_address;
 175         struct in_addr           primary_address;
 176         char                     name[IFNAMSIZ];
 177         int                      rfdesc;
 178         int                      wfdesc;
 179         int                      ufdesc; /* unicast */
 180         unsigned char           *rbuf;
 181         size_t                   rbuf_max;
 182         size_t                   rbuf_offset;
 183         size_t                   rbuf_len;
 184         struct ifreq            *ifp;
 185         int                      noifmedia;
 186         int                      errors;
 187         u_int16_t                index;
 188         int                      linkstat;
 189 };
 190
 191 struct timeout {
 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, struct option_data *, 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__((__noreturn__)) __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 dispatch(void) __dead2;
 250 void got_one(void);
 251 void set_timeout(time_t, void (*)(void));
 252 void set_timeout_interval(time_t, void (*)(void));
 253 void cancel_timeout(void);
 254 int interface_status(char *);
 255 int interface_link_forceup(char *);
 256 int subnet_exists(struct client_lease *);
 257
 258 /* tables.c */
 259 extern const struct option dhcp_options[256];
 260
 261 /* convert.c */
 262 u_int32_t getULong(unsigned char *);
 263 int32_t getLong(unsigned char *);
 264 u_int16_t getUShort(unsigned char *);
 265 int16_t getShort(unsigned char *);
 266 void putULong(unsigned char *, u_int32_t);
 267 void putLong(unsigned char *, int32_t);
 268 void putUShort(unsigned char *, unsigned int);
 269 void putShort(unsigned char *, int);
 270
 271 /* inet.c */
 272 struct iaddr subnet_number(struct iaddr, struct iaddr);
 273 struct iaddr broadcast_addr(struct iaddr, struct iaddr);
 274 int addr_eq(struct iaddr, struct iaddr);
 275 char *piaddr(struct iaddr);
 276
 277 /* dhclient.c */
 278 extern char *path_dhclient_conf;
 279 extern char *path_dhclient_db;
 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 *);