587 lines
20 KiB
C
587 lines
20 KiB
C
/* dhcpd.h
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Definitions for dhcpd... */
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/*
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* Copyright (c) 1995, 1996 The Internet Software Consortium.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <time.h>
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#include "cdefs.h"
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#include "osdep.h"
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#include "dhcp.h"
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#include "tree.h"
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#include "hash.h"
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#include "inet.h"
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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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int packet_length;
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int packet_type;
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int options_valid;
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int client_port;
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struct iaddr client_addr;
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struct interface_info *interface; /* Interface on which packet
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was received. */
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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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};
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struct hardware {
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u_int8_t htype;
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u_int8_t hlen;
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u_int8_t haddr [16];
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};
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/* A dhcp lease declaration structure. */
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struct lease {
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struct lease *next;
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struct lease *prev;
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struct lease *n_uid, *n_hw;
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struct iaddr ip_addr;
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TIME starts, ends, timestamp;
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TIME offered_expiry;
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unsigned char *uid;
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int uid_len;
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char *hostname;
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struct host_decl *host;
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struct subnet *subnet;
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struct shared_network *shared_network;
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struct hardware hardware_addr;
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int state;
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int xid;
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int flags;
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# define STATIC_LEASE 1
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# define BOOTP_LEASE 2
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# define DYNAMIC_BOOTP_OK 4
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# define PERSISTENT_FLAGS (DYNAMIC_BOOTP_OK)
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# define EPHEMERAL_FLAGS (BOOTP_LEASE)
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};
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#define ROOT_GROUP 0
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#define HOST_DECL 1
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#define SHARED_NET_DECL 2
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#define SUBNET_DECL 3
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#define CLASS_DECL 4
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#define GROUP_DECL 5
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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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struct subnet *subnet;
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struct shared_network *shared_network;
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TIME default_lease_time;
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TIME max_lease_time;
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TIME bootp_lease_cutoff;
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TIME bootp_lease_length;
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char *filename;
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char *server_name;
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struct iaddr next_server;
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int boot_unknown_clients;
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int dynamic_bootp;
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int one_lease_per_client;
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int get_lease_hostnames;
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int use_host_decl_names;
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struct tree_cache *options [256];
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};
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/* A dhcp host declaration structure. */
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struct host_decl {
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struct host_decl *n_ipaddr;
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char *name;
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struct hardware interface;
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struct tree_cache *fixed_addr;
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struct group *group;
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};
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struct shared_network {
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struct shared_network *next;
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char *name;
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struct subnet *subnets;
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struct interface_info *interface;
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struct lease *leases;
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struct lease *insertion_point;
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struct lease *last_lease;
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struct group *group;
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};
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struct subnet {
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struct subnet *next_subnet;
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struct subnet *next_sibling;
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struct shared_network *shared_network;
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struct interface_info *interface;
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struct iaddr interface_address;
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struct iaddr net;
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struct iaddr netmask;
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struct group *group;
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};
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struct class {
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char *name;
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struct group *group;
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};
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/* Information about each network interface. */
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struct interface_info {
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struct interface_info *next; /* Next interface in list... */
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struct shared_network *shared_network;
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/* Networks connected to this interface. */
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struct hardware hw_address; /* Its physical address. */
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char name [IFNAMSIZ]; /* Its name... */
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int rfdesc; /* Its read file descriptor. */
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int wfdesc; /* Its write file descriptor, if
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different. */
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unsigned char *rbuf; /* Read buffer, if required. */
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size_t rbuf_max; /* Size of read buffer. */
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size_t rbuf_offset; /* Current offset into buffer. */
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size_t rbuf_len; /* Length of data in buffer. */
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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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};
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struct hardware_link {
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struct hardware_link *next;
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char name [IFNAMSIZ];
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struct hardware address;
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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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/* DHCP Option mask manipulation macros... */
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#define OPTION_ZERO(mask) (memset (mask, 0, 16))
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#define OPTION_SET(mask, bit) (mask [bit >> 8] |= (1 << (bit & 7)))
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#define OPTION_CLR(mask, bit) (mask [bit >> 8] &= ~(1 << (bit & 7)))
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#define OPTION_ISSET(mask, bit) (mask [bit >> 8] & (1 << (bit & 7)))
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#define OPTION_ISCLR(mask, bit) (!OPTION_ISSET (mask, bit))
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/* An option occupies its length plus two header bytes (code and
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length) for every 255 bytes that must be stored. */
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#define OPTION_SPACE(x) ((x) + 2 * ((x) / 255 + 1))
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/* Default path to dhcpd config file. */
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#ifdef DEBUG
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#undef _PATH_DHCPD_CONF
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#define _PATH_DHCPD_CONF "dhcpd.conf"
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#undef _PATH_DHCPD_DB
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#define _PATH_DHCPD_DB "dhcpd.leases"
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#else
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#ifndef _PATH_DHCPD_CONF
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#define _PATH_DHCPD_CONF "/etc/dhcpd.conf"
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#endif
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#ifndef _PATH_DHCPD_DB
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#define _PATH_DHCPD_DB "/etc/dhcpd.leases"
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#endif
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#ifndef _PATH_DHCPD_PID
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#define _PATH_DHCPD_PID "/var/run/dhcpd.pid"
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#endif
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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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#define MAX_TIME 0x7fffffff
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#define MIN_TIME 0
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/* External definitions... */
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/* options.c */
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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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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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char *pretty_print_option PROTO ((unsigned char, unsigned char *, int));
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/* errwarn.c */
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extern int warnings_occurred;
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void error PROTO ((char *, ...));
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int warn PROTO ((char *, ...));
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int note PROTO ((char *, ...));
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int debug PROTO ((char *, ...));
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int parse_warn PROTO ((char *, ...));
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/* dhcpd.c */
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extern TIME cur_time;
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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 int log_priority;
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extern int log_perror;
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#ifdef USE_FALLBACK
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extern struct interface_info fallback_interface;
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#endif
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extern char *path_dhcpd_conf;
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extern char *path_dhcpd_db;
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extern char *path_dhcpd_pid;
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int main PROTO ((int, char **, char **));
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void cleanup PROTO ((void));
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/* conflex.c */
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extern int lexline, lexchar;
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extern char *token_line, *tlname;
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extern char comments [4096];
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extern int comment_index;
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void new_parse PROTO ((char *));
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int next_token PROTO ((char **, FILE *));
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int peek_token PROTO ((char **, FILE *));
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/* confpars.c */
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int readconf PROTO ((void));
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void read_leases PROTO ((void));
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int parse_statement PROTO ((FILE *,
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struct group *, int, struct host_decl *, int));
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void skip_to_semi PROTO ((FILE *));
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int parse_boolean PROTO ((FILE *));
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int parse_semi PROTO ((FILE *));
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int parse_lbrace PROTO ((FILE *));
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void parse_host_declaration PROTO ((FILE *, struct group *));
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char *parse_host_name PROTO ((FILE *));
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void parse_class_declaration PROTO ((FILE *, struct group *, int));
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void parse_lease_time PROTO ((FILE *, TIME *));
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void parse_shared_net_declaration PROTO ((FILE *, struct group *));
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void parse_subnet_declaration PROTO ((FILE *, struct shared_network *));
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void parse_group_declaration PROTO ((FILE *, struct group *));
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void parse_hardware_param PROTO ((FILE *, struct hardware *));
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char *parse_string PROTO ((FILE *));
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struct tree *parse_ip_addr_or_hostname PROTO ((FILE *, int));
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struct tree_cache *parse_fixed_addr_param PROTO ((FILE *));
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void parse_option_param PROTO ((FILE *, struct group *));
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TIME parse_timestamp PROTO ((FILE *));
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struct lease *parse_lease_declaration PROTO ((FILE *));
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void parse_address_range PROTO ((FILE *, struct subnet *));
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TIME parse_date PROTO ((FILE *));
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unsigned char *parse_numeric_aggregate PROTO ((FILE *,
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unsigned char *, int *,
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int, int, int));
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void convert_num PROTO ((unsigned char *, char *, int, int));
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/* tree.c */
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pair cons PROTO ((caddr_t, pair));
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struct tree_cache *tree_cache PROTO ((struct tree *));
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struct tree *tree_host_lookup PROTO ((char *));
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struct dns_host_entry *enter_dns_host PROTO ((char *));
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struct tree *tree_const PROTO ((unsigned char *, int));
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struct tree *tree_concat PROTO ((struct tree *, struct tree *));
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struct tree *tree_limit PROTO ((struct tree *, int));
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int tree_evaluate PROTO ((struct tree_cache *));
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/* dhcp.c */
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void dhcp PROTO ((struct packet *));
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void dhcpdiscover PROTO ((struct packet *));
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void dhcprequest PROTO ((struct packet *));
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void dhcprelease PROTO ((struct packet *));
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void dhcpdecline PROTO ((struct packet *));
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void dhcpinform PROTO ((struct packet *));
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void nak_lease PROTO ((struct packet *, struct iaddr *cip));
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void ack_lease PROTO ((struct packet *, struct lease *, unsigned char, TIME));
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struct lease *find_lease PROTO ((struct packet *, struct shared_network *));
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struct lease *mockup_lease PROTO ((struct packet *,
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struct shared_network *,
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struct host_decl *));
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/* bootp.c */
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void bootp PROTO ((struct packet *));
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/* memory.c */
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void enter_host PROTO ((struct host_decl *));
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struct host_decl *find_hosts_by_haddr PROTO ((int, unsigned char *, int));
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struct host_decl *find_hosts_by_uid PROTO ((unsigned char *, int));
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struct subnet *find_host_for_network PROTO ((struct host_decl **,
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struct iaddr *,
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struct shared_network *));
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void new_address_range PROTO ((struct iaddr, struct iaddr,
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struct subnet *, int));
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extern struct subnet *find_grouped_subnet PROTO ((struct shared_network *,
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struct iaddr));
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extern struct subnet *find_subnet PROTO ((struct iaddr));
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void enter_shared_network PROTO ((struct shared_network *));
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void enter_subnet PROTO ((struct subnet *));
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void enter_lease PROTO ((struct lease *));
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int supersede_lease PROTO ((struct lease *, struct lease *, int));
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void release_lease PROTO ((struct lease *));
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void abandon_lease PROTO ((struct lease *));
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struct lease *find_lease_by_uid PROTO ((unsigned char *, int));
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struct lease *find_lease_by_hw_addr PROTO ((unsigned char *, int));
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struct lease *find_lease_by_ip_addr PROTO ((struct iaddr));
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void uid_hash_add PROTO ((struct lease *));
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void uid_hash_delete PROTO ((struct lease *));
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void hw_hash_add PROTO ((struct lease *));
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void hw_hash_delete PROTO ((struct lease *));
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struct class *add_class PROTO ((int, char *));
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struct class *find_class PROTO ((int, char *, int));
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struct group *clone_group PROTO ((struct group *, char *));
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void write_leases PROTO ((void));
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void dump_subnets PROTO ((void));
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/* alloc.c */
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VOIDPTR dmalloc PROTO ((int, char *));
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void dfree PROTO ((VOIDPTR, char *));
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struct packet *new_packet PROTO ((char *));
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struct dhcp_packet *new_dhcp_packet PROTO ((char *));
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struct tree *new_tree PROTO ((char *));
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struct tree_cache *new_tree_cache PROTO ((char *));
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struct hash_table *new_hash_table PROTO ((int, char *));
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struct hash_bucket *new_hash_bucket PROTO ((char *));
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struct lease *new_lease PROTO ((char *));
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struct lease *new_leases PROTO ((int, char *));
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struct subnet *new_subnet PROTO ((char *));
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struct class *new_class PROTO ((char *));
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struct shared_network *new_shared_network PROTO ((char *));
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struct group *new_group PROTO ((char *));
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void free_group PROTO ((struct group *, char *));
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void free_shared_network PROTO ((struct shared_network *, char *));
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void free_class PROTO ((struct class *, char *));
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void free_subnet PROTO ((struct subnet *, char *));
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void free_lease PROTO ((struct lease *, char *));
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void free_hash_bucket PROTO ((struct hash_bucket *, char *));
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void free_hash_table PROTO ((struct hash_table *, char *));
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void free_tree_cache PROTO ((struct tree_cache *, char *));
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void free_packet PROTO ((struct packet *, char *));
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void free_dhcp_packet PROTO ((struct dhcp_packet *, char *));
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void free_tree PROTO ((struct tree *, char *));
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/* print.c */
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char *print_hw_addr PROTO ((int, int, unsigned char *));
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void print_lease PROTO ((struct lease *));
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void dump_raw PROTO ((unsigned char *, int));
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void dump_packet PROTO ((struct packet *));
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void hash_dump PROTO ((struct hash_table *));
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/* socket.c */
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#if defined (USE_SOCKET_SEND) || defined (USE_SOCKET_RECEIVE) \
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|| defined (USE_SOCKET_FALLBACK)
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int if_register_socket PROTO ((struct interface_info *, struct ifreq *));
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#endif
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#ifdef USE_SOCKET_FALLBACK
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void if_register_fallback PROTO ((struct interface_info *, struct ifreq *));
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size_t send_fallback PROTO ((struct interface_info *,
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struct packet *, struct dhcp_packet *, size_t,
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struct in_addr,
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struct sockaddr_in *, struct hardware *));
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size_t fallback_discard PROTO ((struct interface_info *));
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#endif
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#ifdef USE_SOCKET_SEND
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void if_register_send PROTO ((struct interface_info *, struct ifreq *));
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size_t send_packet PROTO ((struct interface_info *,
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struct packet *, struct dhcp_packet *, size_t,
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struct in_addr,
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struct sockaddr_in *, struct hardware *));
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#endif
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#ifdef USE_SOCKET_RECEIVE
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void if_register_receive PROTO ((struct interface_info *, struct ifreq *));
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size_t receive_packet PROTO ((struct interface_info *,
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unsigned char *, size_t,
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struct sockaddr_in *, struct hardware *));
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#endif
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/* bpf.c */
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#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE)
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int if_register_bpf PROTO ( (struct interface_info *, struct ifreq *));
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#endif
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#ifdef USE_BPF_SEND
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void if_register_send PROTO ((struct interface_info *, struct ifreq *));
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size_t send_packet PROTO ((struct interface_info *,
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struct packet *, struct dhcp_packet *, size_t,
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struct in_addr,
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struct sockaddr_in *, struct hardware *));
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#endif
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#ifdef USE_BPF_RECEIVE
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void if_register_receive PROTO ((struct interface_info *, struct ifreq *));
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size_t receive_packet PROTO ((struct interface_info *,
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unsigned char *, size_t,
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struct sockaddr_in *, struct hardware *));
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#endif
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/* nit.c */
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#ifdef USE_NIT_SEND
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void if_register_send PROTO ((struct interface_info *, struct ifreq *));
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size_t send_packet PROTO ((struct interface_info *,
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struct packet *, struct dhcp_packet *, size_t,
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struct in_addr,
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struct sockaddr_in *, struct hardware *));
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#endif
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#ifdef USE_NIT_RECEIVE
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void if_register_receive PROTO ((struct interface_info *, struct ifreq *));
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size_t receive_packet PROTO ((struct interface_info *,
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unsigned char *, size_t,
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struct sockaddr_in *, struct hardware *));
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#endif
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/* raw.c */
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#ifdef USE_RAW_SEND
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void if_register_send PROTO ((struct interface_info *, struct ifreq *));
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size_t send_packet PROTO ((struct interface_info *,
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struct packet *, struct dhcp_packet *, size_t,
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struct in_addr,
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struct sockaddr_in *, struct hardware *));
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#endif
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/* dispatch.c */
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extern struct interface_info *interfaces;
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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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/* hash.c */
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struct hash_table *new_hash PROTO ((void));
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void add_hash PROTO ((struct hash_table *, char *, int, unsigned char *));
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void delete_hash_entry PROTO ((struct hash_table *, char *, int));
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unsigned char *hash_lookup PROTO ((struct hash_table *, char *, int));
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/* tables.c */
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extern struct option dhcp_options [256];
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extern unsigned char dhcp_option_default_priority_list [];
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extern int sizeof_dhcp_option_default_priority_list;
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extern char *hardware_types [256];
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extern struct hash_table universe_hash;
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extern struct universe dhcp_universe;
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void initialize_universes PROTO ((void));
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/* convert.c */
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u_int32_t getULong PROTO ((unsigned char *));
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int32_t getLong PROTO ((unsigned char *));
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u_int16_t getUShort PROTO ((unsigned char *));
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int16_t getShort PROTO ((unsigned char *));
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void putULong PROTO ((unsigned char *, u_int32_t));
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void putLong PROTO ((unsigned char *, int32_t));
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void putUShort PROTO ((unsigned char *, u_int16_t));
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void putShort PROTO ((unsigned char *, int16_t));
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/* inet.c */
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struct iaddr subnet_number PROTO ((struct iaddr, struct iaddr));
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struct iaddr ip_addr PROTO ((struct iaddr, struct iaddr, u_int32_t));
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u_int32_t host_addr PROTO ((struct iaddr, struct iaddr));
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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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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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/* db.c */
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int write_lease PROTO ((struct lease *));
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int commit_leases PROTO ((void));
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void db_startup PROTO ((void));
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void new_lease_file PROTO ((void));
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|
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/* packet.c */
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|
void assemble_hw_header PROTO ((struct interface_info *, unsigned char *,
|
|
int *, struct hardware *));
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void assemble_udp_ip_header PROTO ((struct interface_info *, unsigned char *,
|
|
int *, u_int32_t, u_int32_t, u_int16_t,
|
|
unsigned char *, int));
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|
size_t decode_hw_header PROTO ((struct interface_info *, unsigned char *,
|
|
int, struct hardware *));
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|
size_t decode_udp_ip_header PROTO ((struct interface_info *, unsigned char *,
|
|
int, struct sockaddr_in *,
|
|
unsigned char *, int));
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/* dhxpxlt.c */
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void convert_statement PROTO ((FILE *));
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void convert_host_statement PROTO ((FILE *, jrefproto));
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void convert_host_name PROTO ((FILE *, jrefproto));
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void convert_class_statement PROTO ((FILE *, jrefproto, int));
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void convert_class_decl PROTO ((FILE *, jrefproto));
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void convert_lease_time PROTO ((FILE *, jrefproto, char *));
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void convert_shared_net_statement PROTO ((FILE *, jrefproto));
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void convert_subnet_statement PROTO ((FILE *, jrefproto));
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|
void convert_subnet_decl PROTO ((FILE *, jrefproto));
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|
void convert_host_decl PROTO ((FILE *, jrefproto));
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|
void convert_hardware_decl PROTO ((FILE *, jrefproto));
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|
void convert_hardware_addr PROTO ((FILE *, jrefproto));
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|
void convert_filename_decl PROTO ((FILE *, jrefproto));
|
|
void convert_servername_decl PROTO ((FILE *, jrefproto));
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|
void convert_ip_addr_or_hostname PROTO ((FILE *, jrefproto, int));
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|
void convert_fixed_addr_decl PROTO ((FILE *, jrefproto));
|
|
void convert_option_decl PROTO ((FILE *, jrefproto));
|
|
void convert_timestamp PROTO ((FILE *, jrefproto));
|
|
void convert_lease_statement PROTO ((FILE *, jrefproto));
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|
void convert_address_range PROTO ((FILE *, jrefproto));
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|
void convert_date PROTO ((FILE *, jrefproto, char *));
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|
void convert_numeric_aggregate PROTO ((FILE *, jrefproto, int, int, int, int));
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|
void indent PROTO ((int));
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