/*
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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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*/
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#include <stdio.h>
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#include <string.h>
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#include "contiki.h"
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#include "contiki-net.h"
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#include "net/dhcpc.h"
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#define STATE_INITIAL 0
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#define STATE_SENDING 1
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#define STATE_OFFER_RECEIVED 2
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#define STATE_CONFIG_RECEIVED 3
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static struct dhcpc_state s;
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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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};
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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 DHCPC_SERVER_PORT 67
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#define DHCPC_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 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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static uint32_t xid;
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static const uint8_t magic_cookie[4] = {99, 130, 83, 99};
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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, s.serverid, 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_req_ipaddr(uint8_t *optptr)
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{
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*optptr++ = DHCP_OPTION_REQ_IPADDR;
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*optptr++ = 4;
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memcpy(optptr, s.ipaddr.u16, 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_req_options(uint8_t *optptr)
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{
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*optptr++ = DHCP_OPTION_REQ_LIST;
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*optptr++ = 3;
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*optptr++ = DHCP_OPTION_SUBNET_MASK;
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*optptr++ = DHCP_OPTION_ROUTER;
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*optptr++ = DHCP_OPTION_DNS_SERVER;
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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_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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/*---------------------------------------------------------------------------*/
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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_REQUEST;
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m->htype = DHCP_HTYPE_ETHERNET;
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m->hlen = s.mac_len;
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m->hops = 0;
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memcpy(m->xid, &xid, sizeof(m->xid));
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m->secs = 0;
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m->flags = UIP_HTONS(BOOTP_BROADCAST); /* Broadcast bit. */
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/* uip_ipaddr_copy(m->ciaddr, uip_hostaddr);*/
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memcpy(m->ciaddr, uip_hostaddr.u16, sizeof(m->ciaddr));
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memset(m->yiaddr, 0, sizeof(m->yiaddr));
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memset(m->siaddr, 0, sizeof(m->siaddr));
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memset(m->giaddr, 0, sizeof(m->giaddr));
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memcpy(m->chaddr, s.mac_addr, s.mac_len);
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memset(&m->chaddr[s.mac_len], 0, sizeof(m->chaddr) - s.mac_len);
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#ifndef UIP_CONF_DHCP_LIGHT
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memset(m->sname, 0, sizeof(m->sname));
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memset(m->file, 0, sizeof(m->file));
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#endif
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memcpy(m->options, magic_cookie, sizeof(magic_cookie));
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_discover(void)
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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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end = add_msg_type(&m->options[4], DHCPDISCOVER);
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end = add_req_options(end);
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end = add_end(end);
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uip_send(uip_appdata, (int)(end - (uint8_t *)uip_appdata));
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_request(void)
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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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end = add_msg_type(&m->options[4], DHCPREQUEST);
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end = add_server_id(end);
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end = add_req_ipaddr(end);
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end = add_end(end);
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uip_send(uip_appdata, (int)(end - (uint8_t *)uip_appdata));
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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parse_options(uint8_t *optptr, int len)
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{
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uint8_t *end = optptr + len;
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uint8_t type = 0;
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while(optptr < end) {
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switch(*optptr) {
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case DHCP_OPTION_SUBNET_MASK:
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memcpy(s.netmask.u16, optptr + 2, 4);
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break;
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case DHCP_OPTION_ROUTER:
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memcpy(s.default_router.u16, optptr + 2, 4);
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break;
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case DHCP_OPTION_DNS_SERVER:
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memcpy(s.dnsaddr.u16, optptr + 2, 4);
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break;
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case DHCP_OPTION_MSG_TYPE:
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type = *(optptr + 2);
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break;
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case DHCP_OPTION_SERVER_ID:
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memcpy(s.serverid, optptr + 2, 4);
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break;
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case DHCP_OPTION_LEASE_TIME:
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memcpy(s.lease_time, optptr + 2, 4);
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break;
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case DHCP_OPTION_END:
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return type;
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}
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optptr += optptr[1] + 2;
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}
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return type;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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parse_msg(void)
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{
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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if(m->op == DHCP_REPLY &&
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memcmp(m->xid, &xid, sizeof(xid)) == 0 &&
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memcmp(m->chaddr, s.mac_addr, s.mac_len) == 0) {
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memcpy(s.ipaddr.u16, m->yiaddr, 4);
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return parse_options(&m->options[4], uip_datalen());
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Is this a "fresh" reply for me? If it is, return the type.
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*/
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static int
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msg_for_me(void)
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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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if(m->op == DHCP_REPLY &&
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memcmp(m->xid, &xid, sizeof(xid)) == 0 &&
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memcmp(m->chaddr, s.mac_addr, s.mac_len) == 0) {
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while(optptr < end) {
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if(*optptr == DHCP_OPTION_MSG_TYPE) {
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return *(optptr + 2);
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} else if (*optptr == DHCP_OPTION_END) {
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return -1;
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}
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optptr += optptr[1] + 2;
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}
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}
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(handle_dhcp(process_event_t ev, void *data))
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{
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clock_time_t ticks;
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PT_BEGIN(&s.pt);
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init:
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xid++;
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s.state = STATE_SENDING;
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s.ticks = CLOCK_SECOND;
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while (1) {
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while(ev != tcpip_event) {
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tcpip_poll_udp(s.conn);
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PT_YIELD(&s.pt);
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}
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send_discover();
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etimer_set(&s.etimer, s.ticks);
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do {
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PT_YIELD(&s.pt);
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if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPOFFER) {
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parse_msg();
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s.state = STATE_OFFER_RECEIVED;
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goto selecting;
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}
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} while (!etimer_expired(&s.etimer));
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if(s.ticks < CLOCK_SECOND * 60) {
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s.ticks *= 2;
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}
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}
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selecting:
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xid++;
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s.ticks = CLOCK_SECOND;
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do {
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while(ev != tcpip_event) {
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tcpip_poll_udp(s.conn);
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PT_YIELD(&s.pt);
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}
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send_request();
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etimer_set(&s.etimer, s.ticks);
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do {
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PT_YIELD(&s.pt);
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if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPACK) {
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parse_msg();
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s.state = STATE_CONFIG_RECEIVED;
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goto bound;
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}
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} while (!etimer_expired(&s.etimer));
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if(s.ticks <= CLOCK_SECOND * 10) {
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s.ticks += CLOCK_SECOND;
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} else {
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goto init;
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}
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} while(s.state != STATE_CONFIG_RECEIVED);
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bound:
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#if 0
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printf("Got IP address %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.ipaddr));
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printf("Got netmask %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.netmask));
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printf("Got DNS server %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.dnsaddr));
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printf("Got default router %d.%d.%d.%d\n",
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uip_ipaddr_to_quad(&s.default_router));
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printf("Lease expires in %ld seconds\n",
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uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]));
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#endif
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dhcpc_configured(&s);
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#define MAX_TICKS (~((clock_time_t)0) / 2)
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#define MAX_TICKS32 (~((uint32_t)0))
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#define IMIN(a, b) ((a) < (b) ? (a) : (b))
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if((uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]))*CLOCK_SECOND/2
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<= MAX_TICKS32) {
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s.ticks = (uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1])
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)*CLOCK_SECOND/2;
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} else {
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s.ticks = MAX_TICKS32;
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}
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while(s.ticks > 0) {
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ticks = IMIN(s.ticks, MAX_TICKS);
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s.ticks -= ticks;
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etimer_set(&s.etimer, ticks);
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PT_YIELD_UNTIL(&s.pt, etimer_expired(&s.etimer));
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}
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if((uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]))*CLOCK_SECOND/2
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<= MAX_TICKS32) {
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s.ticks = (uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1])
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)*CLOCK_SECOND/2;
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} else {
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s.ticks = MAX_TICKS32;
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}
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/* renewing: */
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xid++;
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do {
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while(ev != tcpip_event) {
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tcpip_poll_udp(s.conn);
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PT_YIELD(&s.pt);
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}
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send_request();
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ticks = IMIN(s.ticks / 2, MAX_TICKS);
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s.ticks -= ticks;
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etimer_set(&s.etimer, ticks);
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do {
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PT_YIELD(&s.pt);
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if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPACK) {
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parse_msg();
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goto bound;
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}
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} while(!etimer_expired(&s.etimer));
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} while(s.ticks >= CLOCK_SECOND*3);
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/* rebinding: */
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/* lease_expired: */
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dhcpc_unconfigured(&s);
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goto init;
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PT_END(&s.pt);
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}
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/*---------------------------------------------------------------------------*/
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void
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dhcpc_init(const void *mac_addr, int mac_len)
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{
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uip_ipaddr_t addr;
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s.mac_addr = mac_addr;
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s.mac_len = mac_len;
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s.state = STATE_INITIAL;
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uip_ipaddr(&addr, 255,255,255,255);
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s.conn = udp_new(&addr, UIP_HTONS(DHCPC_SERVER_PORT), NULL);
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if(s.conn != NULL) {
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udp_bind(s.conn, UIP_HTONS(DHCPC_CLIENT_PORT));
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}
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PT_INIT(&s.pt);
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}
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/*---------------------------------------------------------------------------*/
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void
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dhcpc_appcall(process_event_t ev, void *data)
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{
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if(ev == tcpip_event || ev == PROCESS_EVENT_TIMER) {
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handle_dhcp(ev, data);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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dhcpc_request(void)
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{
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uip_ipaddr_t ipaddr;
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if(s.state == STATE_INITIAL) {
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uip_ipaddr(&ipaddr, 0,0,0,0);
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uip_sethostaddr(&ipaddr);
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handle_dhcp(PROCESS_EVENT_NONE, NULL);
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}
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}
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/*---------------------------------------------------------------------------*/
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