/* $OpenBSD: dhcpd.h,v 1.47 2013/04/17 19:26:10 krw Exp $ */ /* * 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 #define ifr_netmask ifr_addr #define HAVE_SA_LEN #define HAVE_MKSTEMP #include "dhcp.h" #include "tree.h" #define DB_TIMEFMT "%w %Y/%m/%d %T UTC" #define OLD_DB_TIMEFMT "%w %Y/%m/%d %T" #define SERVER_PORT 67 #define CLIENT_PORT 68 struct iaddr { int len; unsigned char iabuf[16]; }; struct iaddrlist { struct iaddrlist *next; struct iaddr addr; }; #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]; }; struct option_data { int len; u_int8_t *data; }; struct string_list { struct string_list *next; char *string; }; /* A name server, from /etc/resolv.conf. */ struct name_server { struct name_server *next; struct sockaddr_in addr; time_t rcdate; }; /* A domain search list element. */ struct domain_search_list { struct domain_search_list *next; char *domain; time_t rcdate; }; /* A dhcp packet and the pointers to its option values. */ 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; /* Interface on which packet was received. */ struct hardware *haddr; /* Physical link address of local sender (maybe gateway). */ struct shared_network *shared_network; struct option_data options[256]; int got_requested_address; /* True if client sent the dhcp-requested-address option. */ }; struct hardware { u_int8_t htype; u_int8_t hlen; u_int8_t haddr[16]; }; /* A dhcp lease declaration structure. */ struct lease { struct lease *next; struct lease *prev; struct lease *n_uid, *n_hw; struct lease *waitq_next; struct iaddr ip_addr; time_t starts, ends, timestamp; unsigned char *uid; int uid_len; int uid_max; unsigned char uid_buf[32]; char *hostname; char *client_hostname; struct host_decl *host; struct subnet *subnet; struct shared_network *shared_network; struct hardware hardware_addr; int flags; #define STATIC_LEASE 1 #define BOOTP_LEASE 2 #define DYNAMIC_BOOTP_OK 4 #define PERSISTENT_FLAGS (DYNAMIC_BOOTP_OK) #define EPHEMERAL_FLAGS (BOOTP_LEASE) #define MS_NULL_TERMINATION 8 #define ABANDONED_LEASE 16 struct lease_state *state; u_int8_t releasing; }; struct lease_state { struct lease_state *next; struct interface_info *ip; time_t offered_expiry; struct tree_cache *options[256]; u_int32_t expiry, renewal, rebind; char filename[DHCP_FILE_LEN]; char *server_name; struct iaddr from; int max_message_size; u_int8_t *prl; int prl_len; int got_requested_address; /* True if client sent the dhcp-requested-address option. */ int got_server_identifier; /* True if client sent the dhcp-server-identifier option. */ struct shared_network *shared_network; /* Shared network of interface on which request arrived. */ u_int32_t xid; u_int16_t secs; u_int16_t bootp_flags; struct in_addr ciaddr; struct in_addr giaddr; u_int8_t hops; u_int8_t offer; struct hardware haddr; }; #define ROOT_GROUP 0 #define HOST_DECL 1 #define SHARED_NET_DECL 2 #define SUBNET_DECL 3 #define CLASS_DECL 4 #define GROUP_DECL 5 /* Group of declarations that share common parameters. */ struct group { struct group *next; struct subnet *subnet; struct shared_network *shared_network; time_t default_lease_time; time_t max_lease_time; time_t bootp_lease_cutoff; time_t bootp_lease_length; char *filename; char *server_name; struct iaddr next_server; int boot_unknown_clients; int dynamic_bootp; int allow_bootp; int allow_booting; int get_lease_hostnames; int use_host_decl_names; int use_lease_addr_for_default_route; int authoritative; int always_reply_rfc1048; struct tree_cache *options[256]; }; /* A dhcp host declaration structure. */ struct host_decl { struct host_decl *n_ipaddr; char *name; struct hardware interface; struct tree_cache *fixed_addr; struct group *group; }; struct shared_network { struct shared_network *next; char *name; struct subnet *subnets; struct interface_info *interface; struct lease *leases; struct lease *insertion_point; struct lease *last_lease; struct group *group; }; struct subnet { struct subnet *next_subnet; struct subnet *next_sibling; struct shared_network *shared_network; struct interface_info *interface; struct iaddr interface_address; struct iaddr net; struct iaddr netmask; struct group *group; }; struct class { char *name; struct group *group; }; /* DHCP client lease structure... */ struct client_lease { struct client_lease *next; /* Next lease in list. */ time_t expiry, renewal, rebind; /* Lease timeouts. */ struct iaddr address; /* Address being leased. */ char *server_name; /* Name of boot server. */ char *filename; /* File to boot. */ struct string_list *medium; /* Network medium. */ unsigned int is_static : 1; /* If set, lease is from config file. */ unsigned int is_bootp: 1; /* If set, lease was aquired with BOOTP. */ struct option_data options[256]; /* Options supplied with lease. */ }; /* privsep message. fixed length for easy parsing */ struct pf_cmd { struct in_addr ip; u_int32_t type; }; /* 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 }; /* Configuration information from the config file... */ struct client_config { struct option_data defaults[256]; /* Default values for options. */ enum { ACTION_DEFAULT, /* Use server value if present, otherwise default. */ ACTION_SUPERSEDE, /* Always use default. */ ACTION_PREPEND, /* Prepend default to server. */ ACTION_APPEND /* Append default to server. */ } default_actions[256]; struct option_data send_options[256]; /* Send these to server. */ u_int8_t required_options[256]; /* Options server must supply. */ u_int8_t requested_options[256]; /* Options to request from server. */ int requested_option_count; /* Number of requested options. */ time_t timeout; /* Start to panic if we don't get a lease in this time period when SELECTING. */ time_t initial_interval; /* All exponential backoff intervals start here. */ time_t retry_interval; /* If the protocol failed to produce an address before the timeout, try the protocol again after this many seconds. */ time_t select_interval; /* Wait this many seconds from the first DHCPDISCOVER before picking an offered lease. */ time_t reboot_timeout; /* When in INIT-REBOOT, wait this long before giving up and going to INIT. */ time_t backoff_cutoff; /* When doing exponential backoff, never back off to an interval longer than this amount. */ struct string_list *media; /* Possible network media values. */ char *script_name; /* Name of config script. */ enum { IGNORE, ACCEPT, PREFER } bootp_policy; /* Ignore, accept or prefer BOOTP responses. */ struct string_list *medium; /* Current network medium. */ struct iaddrlist *reject_list; /* Servers to reject. */ }; /* Per-interface state used in the dhcp client... */ struct client_state { struct client_lease *active; /* Currently active lease. */ struct client_lease *new; /* New lease. */ struct client_lease *offered_leases; /* Leases offered to us. */ struct client_lease *leases; /* Leases we currently hold. */ struct client_lease *alias; /* Alias lease. */ enum dhcp_state state; /* Current state for this interface. */ struct iaddr destination; /* Where to send packet. */ u_int32_t xid; /* Transaction ID. */ u_int16_t secs; /* secs value from DHCPDISCOVER. */ time_t first_sending; /* When was first copy sent? */ time_t interval; /* What's the current resend interval? */ struct string_list *medium; /* Last media type tried. */ struct dhcp_packet packet; /* Outgoing DHCP packet. */ int packet_length; /* Actual length of generated packet. */ struct iaddr requested_address; /* Address we would like to get. */ struct client_config *config; /* Information from config file. */ char **scriptEnv; /* Client script env */ int scriptEnvsize; /* size of the env table */ struct string_list *env; /* Client script environment. */ int envc; /* Number of entries in environment. */ }; /* Information about each network interface. */ struct interface_info { struct interface_info *next; /* Next interface in list... */ struct shared_network *shared_network; /* Networks connected to this interface. */ struct hardware hw_address; /* Its physical address. */ struct in_addr primary_address; /* Primary interface address. */ char name[IFNAMSIZ]; /* Its name... */ int rfdesc; /* Its read file descriptor. */ int wfdesc; /* Its write file descriptor, if different. */ unsigned char *rbuf; /* Read buffer, if required. */ size_t rbuf_max; /* Size of read buffer. */ size_t rbuf_offset; /* Current offset into buffer. */ size_t rbuf_len; /* Length of data in buffer. */ struct ifreq *ifp; /* Pointer to ifreq struct. */ /* Only used by DHCP client code. */ struct client_state *client; int noifmedia; int errors; int dead; u_int16_t index; }; struct hardware_link { struct hardware_link *next; char name[IFNAMSIZ]; struct hardware address; }; struct dhcpd_timeout { struct dhcpd_timeout *next; time_t when; void (*func)(void *); void *what; }; struct protocol { struct protocol *next; int fd; void (*handler)(struct protocol *); void *local; }; /* Bitmask of dhcp option codes. */ typedef unsigned char option_mask[16]; /* DHCP Option mask manipulation macros... */ #define OPTION_ZERO(mask) (memset (mask, 0, 16)) #define OPTION_SET(mask, bit) (mask[bit >> 8] |= (1 << (bit & 7))) #define OPTION_CLR(mask, bit) (mask[bit >> 8] &= ~(1 << (bit & 7))) #define OPTION_ISSET(mask, bit) (mask[bit >> 8] & (1 << (bit & 7))) #define OPTION_ISCLR(mask, bit) (!OPTION_ISSET (mask, bit)) /* An option occupies its length plus two header bytes (code and length) for every 255 bytes that must be stored. */ #define OPTION_SPACE(x) ((x) + 2 * ((x) / 255 + 1)) #define _PATH_DHCPD_CONF "/etc/dhcpd.conf" #define _PATH_DHCPD_DB "/var/db/dhcpd.leases" #define _PATH_DEV_PF "/dev/pf" #define DHCPD_LOG_FACILITY LOG_DAEMON #define MAX_TIME 0x7fffffff #define MIN_TIME 0 /* External definitions... */ /* options.c */ void parse_options(struct packet *); void parse_option_buffer(struct packet *, unsigned char *, int); 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; 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))); /* dhcpd.c */ extern time_t cur_time; extern struct group root_group; extern u_int16_t server_port; extern u_int16_t client_port; extern int log_priority; extern int log_perror; extern char *path_dhcpd_conf; extern char *path_dhcpd_db; int main(int, char *[]); void cleanup(void); void lease_pinged(struct iaddr, u_int8_t *, int); void lease_ping_timeout(void *); void periodic_scan(void *); /* 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 *); /* confpars.c */ int readconf(void); void read_leases(void); int parse_statement(FILE *, struct group *, int, struct host_decl *, int); void parse_allow_deny(FILE *, struct group *, int); void skip_to_semi(FILE *); int parse_boolean(FILE *); int parse_semi(FILE *); int parse_lbrace(FILE *); void parse_host_declaration(FILE *, struct group *); char *parse_host_name(FILE *); void parse_class_declaration(FILE *, struct group *, int); void parse_lease_time(FILE *, time_t *); void parse_shared_net_declaration(FILE *, struct group *); void parse_subnet_declaration(FILE *, struct shared_network *); void parse_group_declaration(FILE *, struct group *); void parse_hardware_param(FILE *, struct hardware *); char *parse_string(FILE *); struct tree *parse_ip_addr_or_hostname(FILE *, int); struct tree_cache *parse_fixed_addr_param(FILE *); void parse_option_param(FILE *, struct group *); time_t parse_timestamp(FILE *); struct lease *parse_lease_declaration(FILE *); void parse_address_range(FILE *, struct subnet *); time_t parse_date(FILE *); unsigned char *parse_numeric_aggregate(FILE *, unsigned char *, int *, int, int, int); void convert_num(unsigned char *, char *, int, int); /* tree.c */ pair cons(caddr_t, pair); struct tree_cache *tree_cache(struct tree *); struct tree *tree_host_lookup(char *); struct dns_host_entry *enter_dns_host(char *); struct tree *tree_const(unsigned char *, int); struct tree *tree_concat(struct tree *, struct tree *); struct tree *tree_limit(struct tree *, int); int tree_evaluate(struct tree_cache *); /* dhcp.c */ extern int outstanding_pings; void dhcp(struct packet *); void dhcpdiscover(struct packet *); void dhcprequest(struct packet *); void dhcprelease(struct packet *); void dhcpdecline(struct packet *); void dhcpinform(struct packet *); void nak_lease(struct packet *, struct iaddr *cip); void ack_lease(struct packet *, struct lease *, unsigned int, time_t); void dhcp_reply(struct lease *); struct lease *find_lease(struct packet *, struct shared_network *, int *); struct lease *mockup_lease(struct packet *, struct shared_network *, struct host_decl *); /* bootp.c */ void bootp(struct packet *); /* memory.c */ void enter_host(struct host_decl *); struct host_decl *find_hosts_by_haddr(int, unsigned char *, int); struct host_decl *find_hosts_by_uid(unsigned char *, int); struct subnet *find_host_for_network(struct host_decl **, struct iaddr *, struct shared_network *); void new_address_range(struct iaddr, struct iaddr, struct subnet *, int); extern struct subnet *find_grouped_subnet(struct shared_network *, struct iaddr); extern struct subnet *find_subnet(struct iaddr); void enter_shared_network(struct shared_network *); int subnet_inner_than(struct subnet *, struct subnet *, int); void enter_subnet(struct subnet *); void enter_lease(struct lease *); int supersede_lease(struct lease *, struct lease *, int); void release_lease(struct lease *); void abandon_lease(struct lease *, char *); struct lease *find_lease_by_uid(unsigned char *, int); struct lease *find_lease_by_hw_addr(unsigned char *, int); struct lease *find_lease_by_ip_addr(struct iaddr); void uid_hash_add(struct lease *); void uid_hash_delete(struct lease *); void hw_hash_add(struct lease *); void hw_hash_delete(struct lease *); struct class *add_class(int, char *); struct class *find_class(int, unsigned char *, int); struct group *clone_group(struct group *, char *); void write_leases(void); /* alloc.c */ struct tree_cache *new_tree_cache(char *); struct lease_state *new_lease_state(char *); void free_lease_state(struct lease_state *, char *); void free_tree_cache(struct tree_cache *); /* print.c */ char *print_hw_addr(int, int, unsigned char *); /* bpf.c */ int if_register_bpf(struct interface_info *); void if_register_send(struct interface_info *); ssize_t send_packet(struct interface_info *, struct dhcp_packet *, size_t, struct in_addr, struct sockaddr_in *, struct hardware *); void if_register_receive(struct interface_info *); ssize_t receive_packet(struct interface_info *, unsigned char *, size_t, struct sockaddr_in *, struct hardware *); /* dispatch.c */ extern struct interface_info *interfaces; extern struct protocol *protocols; extern void (*bootp_packet_handler)(struct interface_info *, struct dhcp_packet *, int, unsigned int, struct iaddr, struct hardware *); extern struct dhcpd_timeout *timeouts; void discover_interfaces(int *); void dispatch(void); int locate_network(struct packet *); 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 *); /* hash.c */ struct hash_table *new_hash(void); void add_hash(struct hash_table *, unsigned char *, int, unsigned char *); void delete_hash_entry(struct hash_table *, unsigned char *, int); unsigned char *hash_lookup(struct hash_table *, unsigned char *, int); /* tables.c */ extern struct option dhcp_options[256]; extern unsigned char dhcp_option_default_priority_list[256]; extern char *hardware_types[256]; 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 ip_addr(struct iaddr, struct iaddr, u_int32_t); u_int32_t host_addr(struct iaddr, struct iaddr); int addr_eq(struct iaddr, struct iaddr); char *piaddr(struct iaddr); /* db.c */ int write_lease(struct lease *); int commit_leases(void); void db_startup(void); void new_lease_file(void); /* packet.c */ void assemble_hw_header(struct interface_info *, unsigned char *, int *, struct hardware *); void assemble_udp_ip_header(struct interface_info *, unsigned char *, int *, u_int32_t, u_int32_t, unsigned int, unsigned char *, int); ssize_t decode_hw_header(struct interface_info *, unsigned char *, int, struct hardware *); ssize_t decode_udp_ip_header(struct interface_info *, unsigned char *, int, struct sockaddr_in *, int); u_int32_t checksum(unsigned char *, unsigned, u_int32_t); u_int32_t wrapsum(u_int32_t); /* icmp.c */ void icmp_startup(int, void (*)(struct iaddr, u_int8_t *, int)); int icmp_echorequest(struct iaddr *); void icmp_echoreply(struct protocol *); /* pfutils.c */ __dead void pftable_handler(void); void pf_change_table(int, int, struct in_addr, char *); void pf_kill_state(int, struct in_addr); size_t atomicio(ssize_t (*)(int, void *, size_t), int, void *, size_t); #define vwrite (ssize_t (*)(int, void *, size_t))write void pfmsg(char, struct lease *); extern struct syslog_data sdata;