dhcpd.h

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/*  $OpenBSD: dhcpd.h,v 1.33 2004/05/06 22:29:15 deraadt 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''.
 */

#pragma once

#include <winsock2.h>
#include <iphlpapi.h>
#include "stdint.h"

#define IFNAMSIZ MAX_INTERFACE_NAME_LEN

#define ETH_ALEN 6
#define ETHER_ADDR_LEN  ETH_ALEN
#include <pshpack1.h>
struct ether_header
{
  u_int8_t  ether_dhost[ETH_ALEN];      /* destination eth addr */
  u_int8_t  ether_shost[ETH_ALEN];      /* source ether addr    */
  u_int16_t ether_type;                 /* packet type ID field */
};
#include <poppack.h>

struct ip
  {
    unsigned int ip_hl:4;               /* header length */
    unsigned int ip_v:4;                /* version */
    u_int8_t ip_tos;                    /* type of service */
    u_short ip_len;                     /* total length */
    u_short ip_id;                      /* identification */
    u_short ip_off;                     /* fragment offset field */
#define IP_RF 0x8000                    /* reserved fragment flag */
#define IP_DF 0x4000                    /* dont fragment flag */
#define IP_MF 0x2000                    /* more fragments flag */
#define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
    u_int8_t ip_ttl;                    /* time to live */
    u_int8_t ip_p;                      /* protocol */
    u_short ip_sum;                     /* checksum */
    struct in_addr ip_src, ip_dst;      /* source and dest address */
  };

struct udphdr {
    u_int16_t uh_sport;           /* source port */
    u_int16_t uh_dport;           /* destination port */
    u_int16_t uh_ulen;            /* udp length */
    u_int16_t uh_sum;             /* udp checksum */
};

#define ETHERTYPE_IP 0x0800
#define IPTOS_LOWDELAY 0x10
#define ARPHRD_ETHER 1

// FIXME: I have no idea what this should be!
#define SIZE_T_MAX 1600

#define USE_SOCKET_RECEIVE
#define USE_SOCKET_SEND

#include <sys/types.h>
#include <sys/stat.h>
//#include <sys/time.h>
#include <ctype.h>
#include <fcntl.h>
#include <limits.h>
//#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
//#include <unistd.h>

#include "dhcp.h"
#include "tree.h"

#define LOCAL_PORT  68
#define REMOTE_PORT 67

struct option_data {
    int      len;
    u_int8_t    *data;
};

struct string_list {
    struct string_list  *next;
    char            *string;
};

struct iaddr {
    int len;
    unsigned char iabuf[16];
};

struct iaddrlist {
    struct iaddrlist *next;
    struct iaddr addr;
};

struct packet {
    struct dhcp_packet  *raw;
    int          packet_length;
    int          packet_type;
    int          options_valid;
    int          client_port;
    struct iaddr         client_addr;
    struct interface_info   *interface;
    struct hardware     *haddr;
    struct option_data   options[256];
};

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;
#ifdef __REACTOS__
    time_t           obtained;
    struct iaddr         serveraddress;
#endif
    char            *filename;
    struct string_list  *medium;
    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,
    S_STATIC
};

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           retry_interval;
    time_t           select_interval;
    time_t           reboot_timeout;
    time_t           backoff_cutoff;
    struct string_list  *media;
    char            *script_name;
    enum { IGNORE, ACCEPT, PREFER }
                 bootp_policy;
    struct string_list  *medium;
    struct iaddrlist    *reject_list;
};

struct client_state {
    struct client_lease  *active;
    struct client_lease  *new;
    struct client_lease  *offered_leases;
    struct client_lease  *leases;
    struct client_lease  *alias;
    enum dhcp_state       state;
    struct iaddr          destination;
    u_int32_t         xid;
    u_int16_t         secs;
    time_t            first_sending;
    time_t            interval;
    struct string_list   *medium;
    struct dhcp_packet    packet;
    int           packet_length;
    struct iaddr          requested_address;
    struct client_config     *config;
};

struct interface_info {
    struct interface_info   *next;
    struct hardware      hw_address;
    struct in_addr       primary_address;
    char             name[IFNAMSIZ];
    int          rfdesc;
    int          wfdesc;
    unsigned char       *rbuf;
    size_t           rbuf_max;
    size_t           rbuf_offset;
    size_t           rbuf_len;
    struct client_state *client;
    int          noifmedia;
    int          errors;
    int          dead;
    u_int16_t        index;
};

struct timeout {
    struct timeout  *next;
    time_t       when;
    void         (*func)(void *);
    void        *what;
};

struct protocol {
    struct protocol *next;
    int fd;
    void (*handler)(struct protocol *);
    void *local;
};

#define DEFAULT_HASH_SIZE 97

struct hash_bucket {
    struct hash_bucket *next;
    unsigned char *name;
    int len;
    unsigned char *value;
};

struct hash_table {
    int hash_count;
    struct hash_bucket *buckets[DEFAULT_HASH_SIZE];
};

/* Default path to dhcpd config file. */
#define _PATH_DHCLIENT_CONF "/etc/dhclient.conf"
#define _PATH_DHCLIENT_DB   "/var/db/dhclient.leases"
#define DHCPD_LOG_FACILITY  LOG_DAEMON

#define MAX_TIME 0x7fffffff
#define MIN_TIME 0

/* External definitions... */

/* options.c */
int cons_options(struct packet *, struct dhcp_packet *, int,
    struct tree_cache **, int, int, int, u_int8_t *, int);
char *pretty_print_option(unsigned int,
    unsigned char *, int, int, int);
void do_packet(struct interface_info *, struct dhcp_packet *,
    int, unsigned int, struct iaddr, struct hardware *);

/* errwarn.c */
extern int warnings_occurred;
#ifdef _MSC_VER
void error(char *, ...);
int warning(char *, ...);
int note(char *, ...);
int debug(char *, ...);
int parse_warn(char *, ...);
#else
void error(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int warning(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int note(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int debug(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int parse_warn(char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
#endif

/* conflex.c */
extern int lexline, lexchar;
extern char *token_line, *tlname;
extern char comments[4096];
extern int comment_index;
extern int eol_token;
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 *);
unsigned char *parse_numeric_aggregate(FILE *, unsigned char *, int *,
    int, int, int);
void convert_num(unsigned char *, char *, int, int);
time_t parse_date(FILE *);

/* tree.c */
pair cons(caddr_t, pair);

/* alloc.c */
struct string_list  *new_string_list(size_t size);
struct hash_table   *new_hash_table(int);
struct hash_bucket  *new_hash_bucket(void);
void dfree(void *, char *);
void free_hash_bucket(struct hash_bucket *, char *);


/* bpf.c */
int if_register_bpf(struct interface_info *);
void if_register_send(struct interface_info *);
void if_register_receive(struct interface_info *);
ssize_t send_packet(struct interface_info *, struct dhcp_packet *, size_t,
    struct in_addr, struct sockaddr_in *, struct hardware *);
ssize_t receive_packet(struct interface_info *, unsigned char *, size_t,
    struct sockaddr_in *, struct hardware *);

/* dispatch.c */
extern void (*bootp_packet_handler)(struct interface_info *,
    struct dhcp_packet *, int, unsigned int, struct iaddr, struct hardware *);
void discover_interfaces(struct interface_info *);
void reinitialize_interfaces(void);
void dispatch(void);
void got_one(struct protocol *);
void add_timeout(time_t, void (*)(void *), void *);
void cancel_timeout(void (*)(void *), void *);
void add_protocol(char *, int, void (*)(struct protocol *), void *);
void remove_protocol(struct protocol *);
struct protocol *find_protocol_by_adapter( struct interface_info * );
int interface_link_status(char *);

/* hash.c */
struct hash_table *new_hash(void);
void add_hash(struct hash_table *, unsigned char *, int, unsigned char *);
unsigned char *hash_lookup(struct hash_table *, unsigned char *, int);

/* tables.c */
extern struct dhcp_option dhcp_options[256];
extern unsigned char dhcp_option_default_priority_list[];
extern int sizeof_dhcp_option_default_priority_list;
extern struct hash_table universe_hash;
extern struct universe dhcp_universe;
void initialize_universes(void);

/* 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_priority;
extern int log_perror;

extern struct client_config top_level_config;

void dhcpoffer(struct packet *);
void dhcpack(struct packet *);
void dhcpnak(struct packet *);

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_requesting(void *);
void state_bound(void *);
void state_panic(void *);

void bind_lease(struct interface_info *);

void make_discover(struct interface_info *, struct client_lease *);
void make_request(struct interface_info *, struct client_lease *);
void make_decline(struct interface_info *, struct client_lease *);

void free_client_lease(struct client_lease *);
void rewrite_client_leases(struct interface_info *);
void write_client_lease(struct interface_info *, struct client_lease *, int);

void     priv_script_init(struct interface_info *, char *, char *);
void     priv_script_write_params(struct interface_info *, char *, struct client_lease *);
int  priv_script_go(void);

void script_init(char *, struct string_list *);
void script_write_params(char *, struct client_lease *);
int script_go(void);
void client_envadd(struct client_state *,
    const char *, const char *, const char *, ...);
void script_set_env(struct client_state *, const char *, const char *,
    const char *);
void script_flush_env(struct client_state *);
int dhcp_option_ev_name(char *, size_t, struct dhcp_option *);

struct client_lease *packet_to_lease(struct packet *);
void go_daemon(void);
void client_location_changed(void);

void bootp(struct packet *);
void dhcp(struct packet *);

/* packet.c */
void assemble_hw_header(struct interface_info *, 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);

/* ethernet.c */
void assemble_ethernet_header(struct interface_info *, unsigned char *,
    int *, struct hardware *);
ssize_t decode_ethernet_header(struct interface_info *, unsigned char *,
    int, struct hardware *);

/* clparse.c */
int read_client_conf(struct interface_info *);
void read_client_leases(void);
void parse_client_statement(FILE *, struct interface_info *,
    struct client_config *);
int parse_X(FILE *, u_int8_t *, int);
int parse_option_list(FILE *, u_int8_t *);
void parse_interface_declaration(FILE *, struct client_config *);
struct interface_info *interface_or_dummy(char *);
void make_client_state(struct interface_info *);
void make_client_config(struct interface_info *, struct client_config *);
void parse_client_lease_statement(FILE *, int);
void parse_client_lease_declaration(FILE *, struct client_lease *,
    struct interface_info **);
struct dhcp_option *parse_option_decl(FILE *, struct option_data *);
void parse_string_list(FILE *, struct string_list **, int);
void parse_reject_statement(FILE *, struct client_config *);

/* privsep.c */
struct buf  *buf_open(size_t);
int      buf_add(struct buf *, void *, size_t);
int      buf_close(int, struct buf *);
ssize_t      buf_read(int, void *, size_t);
void         dispatch_imsg(int);