451 lines
12 KiB
C
451 lines
12 KiB
C
/* Adapted by Simon Berg from net/dhcpc.c */
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/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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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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* 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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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 file is part of the Contiki operating system.
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*
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* @(#)$Id: dhcps.c,v 1.2 2010/10/19 18:29:04 adamdunkels Exp $
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*/
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#include <stdio.h>
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#include <string.h>
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#include <uip_arp.h>
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#include "contiki.h"
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#include "contiki-net.h"
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#include "dhcps.h"
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struct dhcp_msg {
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uint8_t op, htype, hlen, hops;
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uint8_t xid[4];
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uint16_t secs, flags;
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uint8_t ciaddr[4];
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uint8_t yiaddr[4];
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uint8_t siaddr[4];
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uint8_t giaddr[4];
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uint8_t chaddr[16];
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#ifndef UIP_CONF_DHCP_LIGHT
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uint8_t sname[64];
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uint8_t file[128];
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#endif
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uint8_t options[312];
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} CC_BYTE_ALIGNED;
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#define BOOTP_BROADCAST 0x8000
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#define DHCP_REQUEST 1
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#define DHCP_REPLY 2
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#define DHCP_HTYPE_ETHERNET 1
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#define DHCP_HLEN_ETHERNET 6
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#define DHCP_MSG_LEN 236
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#define DHCPS_SERVER_PORT 67
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#define DHCPS_CLIENT_PORT 68
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#define DHCPDISCOVER 1
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#define DHCPOFFER 2
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#define DHCPREQUEST 3
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#define DHCPDECLINE 4
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#define DHCPACK 5
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#define DHCPNAK 6
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#define DHCPRELEASE 7
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#define DHCPINFORM 8
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#define DHCP_OPTION_SUBNET_MASK 1
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#define DHCP_OPTION_ROUTER 3
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#define DHCP_OPTION_DNS_SERVER 6
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#define DHCP_OPTION_REQ_IPADDR 50
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#define DHCP_OPTION_LEASE_TIME 51
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#define DHCP_OPTION_MSG_TYPE 53
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#define DHCP_OPTION_SERVER_ID 54
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#define DHCP_OPTION_REQ_LIST 55
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#define DHCP_OPTION_END 255
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#define LEASE_FLAGS_ALLOCATED 0x01 /* Lease with an allocated address*/
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#define LEASE_FLAGS_VALID 0x02 /* Contains a valid but
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possibly outdated lease */
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static const struct dhcps_config *config;
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static uint8_t *
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find_option(uint8_t option)
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{
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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uint8_t *optptr = &m->options[4];
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uint8_t *end = (uint8_t*)uip_appdata + uip_datalen();
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while(optptr < end && *optptr != DHCP_OPTION_END) {
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if(*optptr == option) {
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return optptr;
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}
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optptr += optptr[1] + 2;
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}
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return NULL;
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}
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static const uint8_t magic_cookie[4] = {99, 130, 83, 99};
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static int
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check_cookie(void)
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{
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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return memcmp(m->options, magic_cookie, 4) == 0;
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}
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/* Finds any valid lease for a given MAC address */
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static struct dhcps_client_lease *
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lookup_lease_mac(const uint8_t *chaddr, uint8_t hlen)
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{
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struct dhcps_client_lease *lease = config->leases;
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struct dhcps_client_lease *end = config->leases + config->num_leases;
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while(lease != end) {
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if (lease->flags & LEASE_FLAGS_VALID
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&& memcmp(lease->chaddr, chaddr, hlen) == 0) {
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return lease;
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}
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lease++;
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}
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return NULL;
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}
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static struct dhcps_client_lease *
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lookup_lease_ip(const uip_ipaddr_t *ip)
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{
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struct dhcps_client_lease *lease = config->leases;
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struct dhcps_client_lease *end = config->leases + config->num_leases;
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while(lease != end) {
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if (uip_ipaddr_cmp(&lease->ipaddr, ip)) {
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return lease;
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}
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lease++;
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}
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return NULL;
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}
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static struct dhcps_client_lease *
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find_free_lease(void)
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{
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struct dhcps_client_lease *found = NULL;
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struct dhcps_client_lease *lease = config->leases;
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struct dhcps_client_lease *end = config->leases + config->num_leases;
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while(lease != end) {
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if (!(lease->flags & LEASE_FLAGS_VALID)) return lease;
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if (!(lease->flags & LEASE_FLAGS_ALLOCATED)) found = lease;
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lease++;
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}
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return found;
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}
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struct dhcps_client_lease *
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init_lease(struct dhcps_client_lease *lease,
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const uint8_t *chaddr, uint8_t hlen)
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{
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if (lease) {
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memcpy(lease->chaddr, chaddr, hlen);
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lease->flags = LEASE_FLAGS_VALID;
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}
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return lease;
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}
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static struct dhcps_client_lease *
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choose_address()
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{
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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struct dhcps_client_lease *lease;
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lease = lookup_lease_mac(m->chaddr, m->hlen);
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if (lease) {
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return lease;
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}
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{
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uint8_t *opt;
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opt = find_option(DHCP_OPTION_REQ_IPADDR);
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if (opt && (lease = lookup_lease_ip((uip_ipaddr_t*)&opt[2]))
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&& !(lease->flags & LEASE_FLAGS_ALLOCATED)) {
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return init_lease(lease, m->chaddr,m->hlen);
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}
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}
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lease = find_free_lease();
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if (lease) {
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return init_lease(lease, m->chaddr,m->hlen);
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}
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return NULL;
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}
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static struct dhcps_client_lease *
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allocate_address()
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{
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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struct dhcps_client_lease *lease;
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lease = lookup_lease_mac(m->chaddr, m->hlen);
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if (!lease) {
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uint8_t *opt;
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opt = find_option(DHCP_OPTION_REQ_IPADDR);
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if (!(opt && (lease = lookup_lease_ip((uip_ipaddr_t*)&opt[2]))
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&& !(lease->flags & LEASE_FLAGS_ALLOCATED))) {
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return NULL;
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}
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}
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lease->lease_end = clock_seconds()+config->default_lease_time;
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lease->flags |= LEASE_FLAGS_ALLOCATED;
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return lease;
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}
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static struct dhcps_client_lease *
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release_address()
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{
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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struct dhcps_client_lease *lease;
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lease = lookup_lease_mac(m->chaddr, m->hlen);
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if (!lease) {
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return NULL;
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}
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lease->flags &= ~LEASE_FLAGS_ALLOCATED;
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return lease;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t *
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add_msg_type(uint8_t *optptr, uint8_t type)
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{
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*optptr++ = DHCP_OPTION_MSG_TYPE;
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*optptr++ = 1;
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*optptr++ = type;
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return optptr;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t *
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add_server_id(uint8_t *optptr)
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{
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*optptr++ = DHCP_OPTION_SERVER_ID;
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*optptr++ = 4;
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memcpy(optptr, &uip_hostaddr, 4);
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return optptr + 4;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t *
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add_lease_time(uint8_t *optptr)
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{
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uint32_t lt;
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*optptr++ = DHCP_OPTION_LEASE_TIME;
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*optptr++ = 4;
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lt = UIP_HTONL(config->default_lease_time);
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memcpy(optptr, <, 4);
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return optptr + 4;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t *
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add_end(uint8_t *optptr)
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{
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*optptr++ = DHCP_OPTION_END;
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return optptr;
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}
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static uint8_t *
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add_config(uint8_t *optptr)
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{
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if (config->flags & DHCP_CONF_NETMASK) {
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*optptr++ = DHCP_OPTION_SUBNET_MASK;
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*optptr++ = 4;
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memcpy(optptr, &config->netmask, 4);
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optptr += 4;
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}
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if (config->flags & DHCP_CONF_DNSADDR) {
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*optptr++ = DHCP_OPTION_DNS_SERVER;
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*optptr++ = 4;
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memcpy(optptr, &config->dnsaddr, 4);
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optptr += 4;
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}
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if (config->flags & DHCP_CONF_DEFAULT_ROUTER) {
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*optptr++ = DHCP_OPTION_ROUTER;
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*optptr++ = 4;
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memcpy(optptr, &config->default_router, 4);
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optptr += 4;
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}
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return optptr;
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}
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static void
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create_msg(CC_REGISTER_ARG struct dhcp_msg *m)
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{
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m->op = DHCP_REPLY;
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/* m->htype = DHCP_HTYPE_ETHERNET; */
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/* m->hlen = DHCP_HLEN_ETHERNET; */
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/* memcpy(m->chaddr, &uip_ethaddr,DHCP_HLEN_ETHERNET); */
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m->hops = 0;
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m->secs = 0;
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memcpy(m->siaddr, &uip_hostaddr, 4);
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m->sname[0] = '\0';
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m->file[0] = '\0';
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memcpy(m->options, magic_cookie, sizeof(magic_cookie));
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}
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static uip_ipaddr_t any_addr;
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static uip_ipaddr_t bcast_addr;
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/*---------------------------------------------------------------------------*/
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static void
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send_offer(struct uip_udp_conn *conn, struct dhcps_client_lease *lease)
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{
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uint8_t *end;
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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create_msg(m);
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memcpy(&m->yiaddr, &lease->ipaddr,4);
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end = add_msg_type(&m->options[4], DHCPOFFER);
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end = add_server_id(end);
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end = add_lease_time(end);
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end = add_config(end);
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end = add_end(end);
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uip_ipaddr_copy(&conn->ripaddr, &bcast_addr);
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uip_send(uip_appdata, (int)(end - (uint8_t *)uip_appdata));
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}
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static void
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send_ack(struct uip_udp_conn *conn, struct dhcps_client_lease *lease)
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{
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uint8_t *end;
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uip_ipaddr_t ciaddr;
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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create_msg(m);
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memcpy(&m->yiaddr, &lease->ipaddr,4);
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end = add_msg_type(&m->options[4], DHCPACK);
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end = add_server_id(end);
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end = add_lease_time(end);
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end = add_config(end);
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end = add_end(end);
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memcpy(&ciaddr, &lease->ipaddr,4);
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uip_ipaddr_copy(&conn->ripaddr, &bcast_addr);
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uip_send(uip_appdata, (int)(end - (uint8_t *)uip_appdata));
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printf("ACK\n");
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}
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static void
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send_nack(struct uip_udp_conn *conn)
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{
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uint8_t *end;
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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create_msg(m);
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memset(&m->yiaddr, 0, 4);
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end = add_msg_type(&m->options[4], DHCPNAK);
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end = add_server_id(end);
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end = add_end(end);
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uip_ipaddr_copy(&conn->ripaddr, &bcast_addr);
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uip_send(uip_appdata, (int)(end - (uint8_t *)uip_appdata));
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printf("NACK\n");
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}
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/*---------------------------------------------------------------------------*/
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PROCESS(dhcp_server_process, "DHCP server");
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(dhcp_server_process, ev , data)
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{
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static struct uip_udp_conn *conn;
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static struct uip_udp_conn *send_conn;
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static struct dhcps_client_lease *lease;
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PROCESS_BEGIN();
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printf("DHCP server starting\n");
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uip_ipaddr(&any_addr, 0,0,0,0);
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uip_ipaddr(&bcast_addr, 255,255,255,255);
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conn = udp_new(&any_addr, UIP_HTONS(DHCPS_CLIENT_PORT), NULL);
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if (!conn) goto exit;
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send_conn = udp_new(&bcast_addr, UIP_HTONS(DHCPS_CLIENT_PORT), NULL);
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if (!send_conn) goto exit;
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uip_udp_bind(conn, UIP_HTONS(DHCPS_SERVER_PORT));
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uip_udp_bind(send_conn, UIP_HTONS(DHCPS_SERVER_PORT));
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while(1) {
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PROCESS_WAIT_EVENT();
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if(ev == tcpip_event) {
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if (uip_newdata()) {
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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struct uip_udpip_hdr *header = (struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN];
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if (m->op == DHCP_REQUEST && check_cookie() && m->hlen <= MAX_HLEN) {
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uint8_t *opt = find_option(DHCP_OPTION_MSG_TYPE);
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if (opt) {
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uint8_t mtype = opt[2];
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if (opt[2] == DHCPDISCOVER) {
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printf("Discover\n");
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lease = choose_address();
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if (lease) {
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lease->lease_end = clock_seconds()+config->default_lease_time;
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tcpip_poll_udp(send_conn);
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PROCESS_WAIT_EVENT_UNTIL(uip_poll());
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send_offer(conn,lease);
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}
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} else {
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uint8_t *opt = find_option(DHCP_OPTION_SERVER_ID);
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if (!opt || uip_ipaddr_cmp((uip_ipaddr_t*)&opt[2], &uip_hostaddr)) {
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if (mtype == DHCPREQUEST) {
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printf("Request\n");
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lease = allocate_address();
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tcpip_poll_udp(send_conn);
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PROCESS_WAIT_EVENT_UNTIL(uip_poll());
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if (!lease) {
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send_nack(send_conn);
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} else {
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send_ack(send_conn,lease);
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}
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} else if (mtype == DHCPRELEASE) {
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printf("Release\n");
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release_address();
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} else if (mtype == DHCPDECLINE) {
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printf("Decline\n");
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} else if (mtype == DHCPINFORM) {
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printf("Inform\n");
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}
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}
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}
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}
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}
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}
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} else if (uip_poll()) {
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}
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}
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exit:
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printf("DHCP server exiting\n");
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PROCESS_END();
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}
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void
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dhcps_init(const struct dhcps_config *conf)
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{
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config = conf;
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process_start(&dhcp_server_process,NULL);
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}
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