mirror of
https://gitlab.isc.org/isc-projects/dhcp
synced 2025-08-31 14:25:41 +00:00
Rewrite DHCP client to use the same API that the DHCP server uses.
This commit is contained in:
Ted Lemon
1734
client/dhclient.c
1734
client/dhclient.c
File diff suppressed because it is too large
Load Diff
1734
dhclient.c
1734
dhclient.c
File diff suppressed because it is too large
Load Diff
181
dhcpd.h
181
dhcpd.h
@@ -61,6 +61,11 @@
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#include "hash.h"
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#include "inet.h"
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struct option_data {
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int len;
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u_int8_t *data;
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};
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/* A dhcp packet and the pointers to its option values. */
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struct packet {
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struct dhcp_packet *raw;
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@@ -74,10 +79,7 @@ struct packet {
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struct hardware *haddr; /* Physical link address
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of local sender (maybe gateway). */
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struct shared_network *shared_network;
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struct {
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int len;
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unsigned char *data;
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} options [256];
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struct option_data options [256];
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};
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struct hardware {
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@@ -118,6 +120,12 @@ struct lease {
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#define CLASS_DECL 4
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#define GROUP_DECL 5
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/* Possible modes in which discover_interfaces can run. */
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#define DISCOVER_RUNNING 0
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#define DISCOVER_SERVER 1
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#define DISCOVER_UNCONFIGURED 2
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/* Group of declarations that share common parameters. */
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struct group {
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struct group *next;
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@@ -182,6 +190,70 @@ struct class {
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struct group *group;
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};
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/* DHCP client lease structure... */
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struct client_lease {
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struct client_lease *next;
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TIME expiry, renewal, rebind;
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struct iaddr address;
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char *server_name;
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char *filename;
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struct option_data options [256];
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};
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enum dhcp_state {
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S_INIT,
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S_SELECTING,
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S_REQUESTING,
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S_BOUND,
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S_RENEWING,
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S_REBINDING
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};
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/* Configuration information from the config file... */
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struct client_config {
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struct tree_cache *defaults [256]; /* Default values for options. */
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u_int8_t required_options [256]; /* Options server must supply. */
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u_int8_t requested_options [256]; /* Options to request from server. */
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int requested_option_count; /* Number of requested options. */
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char *dns_hostname; /* Hostname for Dynamic DNS. */
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unsigned char *client_identifier; /* Client idenfitier string. */
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int cid_len; /* Length of client identifier. */
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TIME timeout; /* Start to panic if we don't get a
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lease in this time period when
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SELECTING. */
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TIME retry_interval; /* If the protocol failed to produce
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an address before the timeout,
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try the protocol again after this
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many seconds. */
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TIME select_interval; /* Wait this many seconds from the
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first DHCPDISCOVER before
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picking an offered lease. */
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char *script_name; /* Name of config script. */
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enum { IGNORE, ACCEPT, PREFER } bootp_policy;
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/* Ignore, accept or prefer BOOTP
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responses. */
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};
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/* Per-interface state used in the dhcp client... */
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struct client_state {
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struct client_lease *active; /* Currently active lease. */
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struct client_lease *new; /* New lease. */
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struct client_lease *offered_leases; /* Leases offered to us. */
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struct client_lease *leases; /* Leases we currently hold. */
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enum dhcp_state state; /* Current state for this interface. */
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struct iaddr destination; /* Where to send packet. */
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u_int32_t xid; /* Transaction ID. */
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TIME first_sending; /* When was first copy sent? */
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TIME last_sending; /* When was a packet most recently sent? */
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struct dhcp_packet packet; /* Outgoing DHCP packet. */
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int packet_length; /* Actual length of generated packet. */
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struct client_config *config; /* Information from config file. */
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};
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/* Information about each network interface. */
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struct interface_info {
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@@ -201,6 +273,9 @@ struct interface_info {
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struct ifreq *tif; /* Temp. pointer to ifreq struct. */
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u_int32_t flags; /* Control flags... */
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#define INTERFACE_REQUESTED 1
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/* Only used by DHCP client code. */
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struct client_state *client;
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};
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struct hardware_link {
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@@ -209,6 +284,13 @@ struct hardware_link {
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struct hardware address;
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};
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struct timeout {
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struct timeout *next;
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TIME when;
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void (*func)(struct interface_info *);
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struct interface_info *interface;
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};
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/* Bitmask of dhcp option codes. */
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typedef unsigned char option_mask [16];
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@@ -243,6 +325,19 @@ typedef unsigned char option_mask [16];
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#endif
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#endif
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#ifndef _PATH_DHCLIENT_CONF
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#define _PATH_DHCLIENT_CONF "/etc/dhclient.conf"
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#endif
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#ifndef _PATH_DHCLIENT_PID
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#define _PATH_DHCLIENT_PID "/var/run/dhclient.pid"
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#endif
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#ifndef _PATH_DHCLIENT_DB
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#define _PATH_DHCLIENT_DB "/etc/dhclient.leases"
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#endif
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#ifndef DHCPD_LOG_FACILITY
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#define DHCPD_LOG_FACILITY LOG_DAEMON
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#endif
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@@ -256,7 +351,7 @@ typedef unsigned char option_mask [16];
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void parse_options PROTO ((struct packet *));
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void parse_option_buffer PROTO ((struct packet *, unsigned char *, int));
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void cons_options PROTO ((struct packet *, struct packet *,
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int cons_options PROTO ((struct packet *, struct dhcp_packet *,
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struct tree_cache **, int, int));
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int store_options PROTO ((unsigned char *, int, struct tree_cache **,
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unsigned char *, int, int, int, int));
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@@ -277,7 +372,8 @@ extern struct group root_group;
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extern struct iaddr server_identifier;
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extern int server_identifier_matched;
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extern u_int16_t server_port;
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extern u_int16_t local_port;
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extern u_int16_t remote_port;
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extern int log_priority;
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extern int log_perror;
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@@ -505,12 +601,17 @@ size_t send_packet PROTO ((struct interface_info *,
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/* dispatch.c */
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extern struct interface_info *interfaces;
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extern struct timeout *timeouts;
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void discover_interfaces PROTO ((int));
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void dispatch PROTO ((void));
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void do_packet PROTO ((struct interface_info *,
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unsigned char *, int,
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unsigned short, struct iaddr, struct hardware *));
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int locate_network PROTO ((struct packet *));
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void add_timeout PROTO ((TIME, void (*) (struct interface_info *),
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struct interface_info *));
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void cancel_timeout PROTO ((void (*) (struct interface_info *),
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struct interface_info *));
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/* hash.c */
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struct hash_table *new_hash PROTO ((void));
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@@ -545,32 +646,42 @@ int addr_eq PROTO ((struct iaddr, struct iaddr));
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char *piaddr PROTO ((struct iaddr));
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/* dhclient.c */
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extern char *path_dhclient_conf;
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extern char *path_dhclient_db;
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extern char *path_dhclient_pid;
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extern struct client_config top_level_config;
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void dhcpoffer PROTO ((struct packet *));
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void dhcpack PROTO ((struct packet *));
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void dhcpnak PROTO ((struct packet *));
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void send_discover PROTO ((struct interface_info *));
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void send_request PROTO ((struct packet *));
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void send_release PROTO ((struct packet *));
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void dhclient_fail PROTO ((void));
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void handle_kill PROTO ((int));
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void disable_interface PROTO ((struct interface_info *));
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void route_broadcasts PROTO ((struct interface_info *));
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void apply_parameters PROTO ((struct interface_info *, struct packet *));
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void dhclient_state_machine PROTO ((void));
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int state_init PROTO ((void));
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int state_selecting PROTO ((void));
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int state_requesting PROTO ((void));
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int state_bound PROTO ((void));
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int state_renewing PROTO ((void));
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int state_rebinding PROTO ((void));
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TIME abs_time PROTO ((struct packet *, int));
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void deep_packet_copy PROTO ((struct packet *, struct packet *));
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void read_packet PROTO ((struct interface_info *, struct packet *));
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void send_packet_struct PROTO ((struct interface_info *,
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u_long, struct packet *));
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void make_discover PROTO ((struct interface_info *, struct packet *));
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void make_request PROTO ((struct packet *, struct packet *));
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void make_release PROTO ((struct packet *, struct packet *));
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void send_request PROTO ((struct interface_info *));
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void send_release PROTO ((struct interface_info *));
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void state_init PROTO ((struct interface_info *));
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void state_selecting PROTO ((struct interface_info *));
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void state_requesting PROTO ((struct interface_info *));
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void state_bound PROTO ((struct interface_info *));
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void make_discover PROTO ((struct interface_info *, struct client_lease *));
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void make_request PROTO ((struct interface_info *, struct client_lease *));
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void make_decline PROTO ((struct interface_info *, struct client_lease *));
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void make_release PROTO ((struct interface_info *, struct client_lease *));
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void free_client_lease PROTO ((struct client_lease *));
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void rewrite_client_leases PROTO ((void));
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void write_client_lease PROTO ((struct interface_info *,
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struct client_lease *));
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char *dhcp_option_ev_name PROTO ((struct option *));
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void script_init PROTO ((struct interface_info *, char *));
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void script_write_params PROTO ((struct interface_info *,
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char *, struct client_lease *));
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int script_go PROTO ((struct interface_info *));
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struct client_lease *packet_to_lease PROTO ((struct packet *));
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/* db.c */
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int write_lease PROTO ((struct lease *));
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@@ -627,3 +738,17 @@ void remove_all_if_routes PROTO ((struct interface_info *));
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void set_netmask PROTO ((struct interface_info *, struct in_addr));
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void set_broadcast_addr PROTO ((struct interface_info *, struct in_addr));
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void set_ip_address PROTO ((struct interface_info *, struct in_addr));
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/* clparse.c */
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int read_client_conf PROTO ((void));
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void read_client_leases PROTO ((void));
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void parse_client_statement PROTO ((FILE *, struct interface_info *,
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struct client_config *));
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int parse_X PROTO ((FILE *, u_int8_t **));
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int parse_option_list PROTO ((FILE *, u_int8_t *));
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void parse_interface_declaration PROTO ((FILE *, struct client_config *));
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void parse_client_lease_statement PROTO ((FILE *));
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void parse_client_lease_declaration PROTO ((FILE *, struct client_lease *,
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struct interface_info **));
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void parse_ip_addr PROTO ((FILE *, struct iaddr *));
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void parse_option_decl PROTO ((FILE *, struct option_data *));
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181
includes/dhcpd.h
181
includes/dhcpd.h
@@ -61,6 +61,11 @@
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#include "hash.h"
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#include "inet.h"
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struct option_data {
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int len;
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u_int8_t *data;
|
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};
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|
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/* A dhcp packet and the pointers to its option values. */
|
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struct packet {
|
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struct dhcp_packet *raw;
|
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@@ -74,10 +79,7 @@ struct packet {
|
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struct hardware *haddr; /* Physical link address
|
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of local sender (maybe gateway). */
|
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struct shared_network *shared_network;
|
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struct {
|
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int len;
|
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unsigned char *data;
|
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} options [256];
|
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struct option_data options [256];
|
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};
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|
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struct hardware {
|
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@@ -118,6 +120,12 @@ struct lease {
|
||||
#define CLASS_DECL 4
|
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#define GROUP_DECL 5
|
||||
|
||||
/* Possible modes in which discover_interfaces can run. */
|
||||
|
||||
#define DISCOVER_RUNNING 0
|
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#define DISCOVER_SERVER 1
|
||||
#define DISCOVER_UNCONFIGURED 2
|
||||
|
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/* Group of declarations that share common parameters. */
|
||||
struct group {
|
||||
struct group *next;
|
||||
@@ -182,6 +190,70 @@ struct class {
|
||||
struct group *group;
|
||||
};
|
||||
|
||||
/* DHCP client lease structure... */
|
||||
struct client_lease {
|
||||
struct client_lease *next;
|
||||
TIME expiry, renewal, rebind;
|
||||
struct iaddr address;
|
||||
char *server_name;
|
||||
char *filename;
|
||||
|
||||
struct option_data options [256];
|
||||
};
|
||||
|
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enum dhcp_state {
|
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S_INIT,
|
||||
S_SELECTING,
|
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S_REQUESTING,
|
||||
S_BOUND,
|
||||
S_RENEWING,
|
||||
S_REBINDING
|
||||
};
|
||||
|
||||
/* Configuration information from the config file... */
|
||||
struct client_config {
|
||||
struct tree_cache *defaults [256]; /* Default values for options. */
|
||||
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. */
|
||||
char *dns_hostname; /* Hostname for Dynamic DNS. */
|
||||
unsigned char *client_identifier; /* Client idenfitier string. */
|
||||
int cid_len; /* Length of client identifier. */
|
||||
TIME timeout; /* Start to panic if we don't get a
|
||||
lease in this time period when
|
||||
SELECTING. */
|
||||
TIME retry_interval; /* If the protocol failed to produce
|
||||
an address before the timeout,
|
||||
try the protocol again after this
|
||||
many seconds. */
|
||||
TIME select_interval; /* Wait this many seconds from the
|
||||
first DHCPDISCOVER before
|
||||
picking an offered lease. */
|
||||
char *script_name; /* Name of config script. */
|
||||
enum { IGNORE, ACCEPT, PREFER } bootp_policy;
|
||||
/* Ignore, accept or prefer BOOTP
|
||||
responses. */
|
||||
};
|
||||
|
||||
/* 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. */
|
||||
|
||||
enum dhcp_state state; /* Current state for this interface. */
|
||||
struct iaddr destination; /* Where to send packet. */
|
||||
u_int32_t xid; /* Transaction ID. */
|
||||
TIME first_sending; /* When was first copy sent? */
|
||||
TIME last_sending; /* When was a packet most recently sent? */
|
||||
|
||||
struct dhcp_packet packet; /* Outgoing DHCP packet. */
|
||||
int packet_length; /* Actual length of generated packet. */
|
||||
|
||||
struct client_config *config; /* Information from config file. */
|
||||
};
|
||||
|
||||
/* Information about each network interface. */
|
||||
|
||||
struct interface_info {
|
||||
@@ -201,6 +273,9 @@ struct interface_info {
|
||||
struct ifreq *tif; /* Temp. pointer to ifreq struct. */
|
||||
u_int32_t flags; /* Control flags... */
|
||||
#define INTERFACE_REQUESTED 1
|
||||
|
||||
/* Only used by DHCP client code. */
|
||||
struct client_state *client;
|
||||
};
|
||||
|
||||
struct hardware_link {
|
||||
@@ -209,6 +284,13 @@ struct hardware_link {
|
||||
struct hardware address;
|
||||
};
|
||||
|
||||
struct timeout {
|
||||
struct timeout *next;
|
||||
TIME when;
|
||||
void (*func)(struct interface_info *);
|
||||
struct interface_info *interface;
|
||||
};
|
||||
|
||||
/* Bitmask of dhcp option codes. */
|
||||
typedef unsigned char option_mask [16];
|
||||
|
||||
@@ -243,6 +325,19 @@ typedef unsigned char option_mask [16];
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#ifndef _PATH_DHCLIENT_CONF
|
||||
#define _PATH_DHCLIENT_CONF "/etc/dhclient.conf"
|
||||
#endif
|
||||
|
||||
#ifndef _PATH_DHCLIENT_PID
|
||||
#define _PATH_DHCLIENT_PID "/var/run/dhclient.pid"
|
||||
#endif
|
||||
|
||||
#ifndef _PATH_DHCLIENT_DB
|
||||
#define _PATH_DHCLIENT_DB "/etc/dhclient.leases"
|
||||
#endif
|
||||
|
||||
|
||||
#ifndef DHCPD_LOG_FACILITY
|
||||
#define DHCPD_LOG_FACILITY LOG_DAEMON
|
||||
#endif
|
||||
@@ -256,7 +351,7 @@ typedef unsigned char option_mask [16];
|
||||
|
||||
void parse_options PROTO ((struct packet *));
|
||||
void parse_option_buffer PROTO ((struct packet *, unsigned char *, int));
|
||||
void cons_options PROTO ((struct packet *, struct packet *,
|
||||
int cons_options PROTO ((struct packet *, struct dhcp_packet *,
|
||||
struct tree_cache **, int, int));
|
||||
int store_options PROTO ((unsigned char *, int, struct tree_cache **,
|
||||
unsigned char *, int, int, int, int));
|
||||
@@ -277,7 +372,8 @@ extern struct group root_group;
|
||||
extern struct iaddr server_identifier;
|
||||
extern int server_identifier_matched;
|
||||
|
||||
extern u_int16_t server_port;
|
||||
extern u_int16_t local_port;
|
||||
extern u_int16_t remote_port;
|
||||
extern int log_priority;
|
||||
extern int log_perror;
|
||||
|
||||
@@ -505,12 +601,17 @@ size_t send_packet PROTO ((struct interface_info *,
|
||||
|
||||
/* dispatch.c */
|
||||
extern struct interface_info *interfaces;
|
||||
extern struct timeout *timeouts;
|
||||
void discover_interfaces PROTO ((int));
|
||||
void dispatch PROTO ((void));
|
||||
void do_packet PROTO ((struct interface_info *,
|
||||
unsigned char *, int,
|
||||
unsigned short, struct iaddr, struct hardware *));
|
||||
int locate_network PROTO ((struct packet *));
|
||||
void add_timeout PROTO ((TIME, void (*) (struct interface_info *),
|
||||
struct interface_info *));
|
||||
void cancel_timeout PROTO ((void (*) (struct interface_info *),
|
||||
struct interface_info *));
|
||||
|
||||
/* hash.c */
|
||||
struct hash_table *new_hash PROTO ((void));
|
||||
@@ -545,32 +646,42 @@ int addr_eq PROTO ((struct iaddr, struct iaddr));
|
||||
char *piaddr PROTO ((struct iaddr));
|
||||
|
||||
/* dhclient.c */
|
||||
extern char *path_dhclient_conf;
|
||||
extern char *path_dhclient_db;
|
||||
extern char *path_dhclient_pid;
|
||||
|
||||
extern struct client_config top_level_config;
|
||||
|
||||
void dhcpoffer PROTO ((struct packet *));
|
||||
void dhcpack PROTO ((struct packet *));
|
||||
void dhcpnak PROTO ((struct packet *));
|
||||
|
||||
void send_discover PROTO ((struct interface_info *));
|
||||
void send_request PROTO ((struct packet *));
|
||||
void send_release PROTO ((struct packet *));
|
||||
void dhclient_fail PROTO ((void));
|
||||
void handle_kill PROTO ((int));
|
||||
void disable_interface PROTO ((struct interface_info *));
|
||||
void route_broadcasts PROTO ((struct interface_info *));
|
||||
void apply_parameters PROTO ((struct interface_info *, struct packet *));
|
||||
void dhclient_state_machine PROTO ((void));
|
||||
int state_init PROTO ((void));
|
||||
int state_selecting PROTO ((void));
|
||||
int state_requesting PROTO ((void));
|
||||
int state_bound PROTO ((void));
|
||||
int state_renewing PROTO ((void));
|
||||
int state_rebinding PROTO ((void));
|
||||
TIME abs_time PROTO ((struct packet *, int));
|
||||
void deep_packet_copy PROTO ((struct packet *, struct packet *));
|
||||
void read_packet PROTO ((struct interface_info *, struct packet *));
|
||||
void send_packet_struct PROTO ((struct interface_info *,
|
||||
u_long, struct packet *));
|
||||
void make_discover PROTO ((struct interface_info *, struct packet *));
|
||||
void make_request PROTO ((struct packet *, struct packet *));
|
||||
void make_release PROTO ((struct packet *, struct packet *));
|
||||
void send_request PROTO ((struct interface_info *));
|
||||
void send_release PROTO ((struct interface_info *));
|
||||
|
||||
void state_init PROTO ((struct interface_info *));
|
||||
void state_selecting PROTO ((struct interface_info *));
|
||||
void state_requesting PROTO ((struct interface_info *));
|
||||
void state_bound PROTO ((struct interface_info *));
|
||||
|
||||
void make_discover PROTO ((struct interface_info *, struct client_lease *));
|
||||
void make_request PROTO ((struct interface_info *, struct client_lease *));
|
||||
void make_decline PROTO ((struct interface_info *, struct client_lease *));
|
||||
void make_release PROTO ((struct interface_info *, struct client_lease *));
|
||||
|
||||
void free_client_lease PROTO ((struct client_lease *));
|
||||
void rewrite_client_leases PROTO ((void));
|
||||
void write_client_lease PROTO ((struct interface_info *,
|
||||
struct client_lease *));
|
||||
char *dhcp_option_ev_name PROTO ((struct option *));
|
||||
|
||||
void script_init PROTO ((struct interface_info *, char *));
|
||||
void script_write_params PROTO ((struct interface_info *,
|
||||
char *, struct client_lease *));
|
||||
int script_go PROTO ((struct interface_info *));
|
||||
|
||||
struct client_lease *packet_to_lease PROTO ((struct packet *));
|
||||
|
||||
/* db.c */
|
||||
int write_lease PROTO ((struct lease *));
|
||||
@@ -627,3 +738,17 @@ void remove_all_if_routes PROTO ((struct interface_info *));
|
||||
void set_netmask PROTO ((struct interface_info *, struct in_addr));
|
||||
void set_broadcast_addr PROTO ((struct interface_info *, struct in_addr));
|
||||
void set_ip_address PROTO ((struct interface_info *, struct in_addr));
|
||||
|
||||
/* clparse.c */
|
||||
int read_client_conf PROTO ((void));
|
||||
void read_client_leases PROTO ((void));
|
||||
void parse_client_statement PROTO ((FILE *, struct interface_info *,
|
||||
struct client_config *));
|
||||
int parse_X PROTO ((FILE *, u_int8_t **));
|
||||
int parse_option_list PROTO ((FILE *, u_int8_t *));
|
||||
void parse_interface_declaration PROTO ((FILE *, struct client_config *));
|
||||
void parse_client_lease_statement PROTO ((FILE *));
|
||||
void parse_client_lease_declaration PROTO ((FILE *, struct client_lease *,
|
||||
struct interface_info **));
|
||||
void parse_ip_addr PROTO ((FILE *, struct iaddr *));
|
||||
void parse_option_decl PROTO ((FILE *, struct option_data *));
|
||||
|
||||
Reference in New Issue
Block a user