/*      $OpenBSD: src/sbin/dhclient/dhcpd.h,v 1.82 2012/10/27 23:08:53 krw Exp $        */

/*
 * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
 * 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 <mellon@fugue.com> 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 <sys/socket.h>
#include <sys/sockio.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>

#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <netdb.h>
#include <paths.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>

#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_IGNORE,
                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;
};

struct timeout {
        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, struct option_data *, int);
void do_packet(int, unsigned int, struct iaddr, struct hardware *);

/* errwarn.c */
extern int warnings_occurred;
void error(char *, ...) __attribute__((__noreturn__)) __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 dispatch(void) __dead2;
void got_one(void);
void set_timeout(time_t, void (*)(void));
void set_timeout_interval(time_t, void (*)(void));
void cancel_timeout(void);
int interface_status(char *);
int interface_link_forceup(char *);
int subnet_exists(struct client_lease *);

/* 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 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 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 *);