/* $OpenBSD: dhcpd.h,v 1.74 2011/12/10 15:55:43 krw Exp $ */ /* * Copyright (c) 2004 Henning Brauer * Copyright (c) 1995, 1996, 1997, 1998, 1999 * The Internet Software Consortium. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of The Internet Software Consortium nor the names * of its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This software has been written for the Internet Software Consortium * by Ted Lemon in cooperation with Vixie * Enterprises. To learn more about the Internet Software Consortium, * see ``http://www.vix.com/isc''. To learn more about Vixie * Enterprises, see ``http://www.vix.com''. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "dhcp.h" #define LOCAL_PORT 68 #define REMOTE_PORT 67 struct option { char *name; char *format; }; struct option_data { unsigned int len; u_int8_t *data; }; struct string_list { struct string_list *next; char string[1]; /* Actually bigger. */ }; struct iaddr { int len; unsigned char iabuf[16]; }; struct iaddrlist { struct iaddrlist *next; struct iaddr addr; }; struct hardware { u_int8_t htype; u_int8_t hlen; u_int8_t haddr[16]; }; struct client_lease { struct client_lease *next; time_t expiry, renewal, rebind; struct iaddr address; char *server_name; char *filename; unsigned int is_static : 1; unsigned int is_bootp : 1; struct option_data options[256]; }; /* Possible states in which the client can be. */ enum dhcp_state { S_REBOOTING, S_INIT, S_SELECTING, S_REQUESTING, S_BOUND, S_RENEWING, S_REBINDING }; struct client_config { struct option_data defaults[256]; enum { ACTION_DEFAULT, ACTION_SUPERSEDE, ACTION_PREPEND, ACTION_APPEND } default_actions[256]; struct option_data send_options[256]; u_int8_t required_options[256]; u_int8_t requested_options[256]; int requested_option_count; time_t timeout; time_t initial_interval; time_t link_timeout; time_t retry_interval; time_t select_interval; time_t reboot_timeout; time_t backoff_cutoff; char *script_name; enum { IGNORE, ACCEPT, PREFER } bootp_policy; struct iaddrlist *reject_list; }; struct client_state { struct client_lease *active; struct client_lease *new; struct client_lease *offered_leases; struct client_lease *leases; enum dhcp_state state; struct iaddr destination; u_int32_t xid; u_int16_t secs; time_t first_sending; time_t interval; struct dhcp_packet packet; int packet_length; struct iaddr requested_address; char **scriptEnv; int scriptEnvsize; }; struct interface_info { struct hardware hw_address; struct in_addr primary_address; char name[IFNAMSIZ]; int rfdesc; int wfdesc; int ufdesc; /* unicast */ unsigned char *rbuf; size_t rbuf_max; size_t rbuf_offset; size_t rbuf_len; struct ifreq *ifp; int noifmedia; int errors; u_int16_t index; int linkstat; int rdomain; }; struct timeout { struct timeout *next; time_t when; void (*func)(void); }; #define _PATH_DHCLIENT_CONF "/etc/dhclient.conf" #define _PATH_DHCLIENT_DB "/var/db/dhclient.leases" #define _PATH_DHCLIENT_SCRIPT "/sbin/dhclient-script" #define DHCPD_LOG_FACILITY LOG_DAEMON /* External definitions... */ extern struct interface_info *ifi; extern struct client_state *client; extern struct client_config *config; /* options.c */ int cons_options(struct option_data *); char *pretty_print_option(unsigned int, unsigned char *, int, int, int); void do_packet(int, unsigned int, struct iaddr, struct hardware *); /* errwarn.c */ extern int warnings_occurred; void error(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); int warning(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); int note(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); #ifdef DEBUG int debug(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); #endif int parse_warn(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2))); /* conflex.c */ extern int lexline, lexchar; extern char *token_line, *tlname; void new_parse(char *); int next_token(char **, FILE *); int peek_token(char **, FILE *); /* parse.c */ void skip_to_semi(FILE *); int parse_semi(FILE *); char *parse_string(FILE *); int parse_ip_addr(FILE *, struct iaddr *); void parse_hardware_param(FILE *, struct hardware *); void parse_lease_time(FILE *, time_t *); int parse_numeric_aggregate(FILE *, unsigned char *, int, int, int); void convert_num(unsigned char *, char *, int, int); time_t parse_date(FILE *); /* bpf.c */ int if_register_bpf(void); void if_register_send(void); void if_register_receive(void); ssize_t send_packet(struct in_addr, struct sockaddr_in *, struct hardware *); ssize_t receive_packet(struct sockaddr_in *, struct hardware *); /* dispatch.c */ void discover_interface(void); void reinitialize_interface(void); void dispatch(void); void got_one(void); void add_timeout(time_t, void (*)(void)); void cancel_timeout(void (*)(void)); int interface_link_status(char *); int interface_status(char *); int interface_link_forceup(char *); int get_rdomain(char *); /* tables.c */ extern const struct option dhcp_options[256]; /* convert.c */ u_int32_t getULong(unsigned char *); int32_t getLong(unsigned char *); u_int16_t getUShort(unsigned char *); int16_t getShort(unsigned char *); void putULong(unsigned char *, u_int32_t); void putLong(unsigned char *, int32_t); void putUShort(unsigned char *, unsigned int); void putShort(unsigned char *, int); /* inet.c */ struct iaddr subnet_number(struct iaddr, struct iaddr); struct iaddr broadcast_addr(struct iaddr, struct iaddr); int addr_eq(struct iaddr, struct iaddr); char *piaddr(struct iaddr); /* dhclient.c */ extern char *path_dhclient_conf; extern char *path_dhclient_db; extern time_t cur_time; extern int log_perror; extern int routefd; void dhcpoffer(struct iaddr, struct option_data *); void dhcpack(struct iaddr, struct option_data *); void dhcpnak(struct iaddr, struct option_data *); void send_discover(void); void send_request(void); void send_decline(void); void state_reboot(void); void state_init(void); void state_selecting(void); void state_bound(void); void state_panic(void); void bind_lease(void); void make_discover(struct client_lease *); void make_request(struct client_lease *); void make_decline(struct client_lease *); void free_client_lease(struct client_lease *); void rewrite_client_leases(void); void write_client_lease(struct client_lease *); void priv_script_init(char *); void priv_script_write_params(char *, struct client_lease *); int priv_script_go(void); void script_init(char *); void script_write_params(char *, struct client_lease *); int script_go(void); void script_set_env(const char *, const char *, const char *); void script_flush_env(void); int dhcp_option_ev_name(char *, size_t, const struct option *); struct client_lease *packet_to_lease(struct iaddr, struct option_data *); void go_daemon(void); void routehandler(void); /* packet.c */ void assemble_hw_header(unsigned char *, int *, struct hardware *); void assemble_udp_ip_header(unsigned char *, int *, u_int32_t, u_int32_t, unsigned int, unsigned char *, int); ssize_t decode_hw_header(unsigned char *, int, struct hardware *); ssize_t decode_udp_ip_header(unsigned char *, int, struct sockaddr_in *, unsigned char *, int); /* clparse.c */ int read_client_conf(void); void read_client_leases(void); void parse_client_statement(FILE *); int parse_X(FILE *, u_int8_t *, int); int parse_option_list(FILE *, u_int8_t *); void parse_interface_declaration(FILE *); void parse_client_lease_statement(FILE *, int); void parse_client_lease_declaration(FILE *, struct client_lease *); int parse_option_decl(FILE *, struct option_data *); void parse_string_list(FILE *, struct string_list **, int); void parse_reject_statement(FILE *);