mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-18 12:05:11 +00:00
12fd559244
RFC2131 states on page 36 regarding DHCPREQUEST: " 'xid' from server DHCPOFFER message " As the DHCPOFFER message uses the 'xid' from the DHCPDISCOVER message this means that the DHCP client is supposed to re-use the 'xid' from its DHCPDISCOVER for the DHCPREQUEST.
449 lines
12 KiB
C
449 lines
12 KiB
C
/*
|
|
* Copyright (c) 2005, Swedish Institute of Computer Science
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
* @(#)$Id: dhcpc.c,v 1.9 2010/10/19 18:29:04 adamdunkels Exp $
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "contiki.h"
|
|
#include "contiki-net.h"
|
|
#include "ip64-dhcpc.h"
|
|
|
|
#include "ip64-addr.h"
|
|
|
|
#define STATE_INITIAL 0
|
|
#define STATE_SENDING 1
|
|
#define STATE_OFFER_RECEIVED 2
|
|
#define STATE_CONFIG_RECEIVED 3
|
|
|
|
static struct ip64_dhcpc_state s;
|
|
|
|
struct dhcp_msg {
|
|
uint8_t op, htype, hlen, hops;
|
|
uint8_t xid[4];
|
|
uint16_t secs, flags;
|
|
uint8_t ciaddr[4];
|
|
uint8_t yiaddr[4];
|
|
uint8_t siaddr[4];
|
|
uint8_t giaddr[4];
|
|
uint8_t chaddr[16];
|
|
uint8_t sname[64];
|
|
uint8_t file[128];
|
|
uint8_t options[312];
|
|
};
|
|
|
|
#if (UIP_BUFSIZE - UIP_UDPIP_HLEN) < 548
|
|
#error UIP_CONF_BUFFER_SIZE may be too small to accomodate DHCPv4 packets
|
|
#error Increase UIP_CONF_BUFFER_SIZE in your project-conf.h, platform-conf.h, or contiki-conf.h
|
|
#error A good size is 600 bytes
|
|
#endif
|
|
|
|
#define BOOTP_BROADCAST 0x8000
|
|
|
|
#define DHCP_REQUEST 1
|
|
#define DHCP_REPLY 2
|
|
#define DHCP_HTYPE_ETHERNET 1
|
|
#define DHCP_HLEN_ETHERNET 6
|
|
#define DHCP_MSG_LEN 236
|
|
|
|
#define IP64_DHCPC_SERVER_PORT 67
|
|
#define IP64_DHCPC_CLIENT_PORT 68
|
|
|
|
#define DHCPDISCOVER 1
|
|
#define DHCPOFFER 2
|
|
#define DHCPREQUEST 3
|
|
#define DHCPDECLINE 4
|
|
#define DHCPACK 5
|
|
#define DHCPNAK 6
|
|
#define DHCPRELEASE 7
|
|
|
|
#define DHCP_OPTION_SUBNET_MASK 1
|
|
#define DHCP_OPTION_ROUTER 3
|
|
#define DHCP_OPTION_DNS_SERVER 6
|
|
#define DHCP_OPTION_REQ_IPADDR 50
|
|
#define DHCP_OPTION_LEASE_TIME 51
|
|
#define DHCP_OPTION_MSG_TYPE 53
|
|
#define DHCP_OPTION_SERVER_ID 54
|
|
#define DHCP_OPTION_REQ_LIST 55
|
|
#define DHCP_OPTION_END 255
|
|
|
|
static uint32_t xid;
|
|
static const uint8_t magic_cookie[4] = {99, 130, 83, 99};
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t *
|
|
add_msg_type(uint8_t *optptr, uint8_t type)
|
|
{
|
|
*optptr++ = DHCP_OPTION_MSG_TYPE;
|
|
*optptr++ = 1;
|
|
*optptr++ = type;
|
|
return optptr;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t *
|
|
add_server_id(uint8_t *optptr)
|
|
{
|
|
*optptr++ = DHCP_OPTION_SERVER_ID;
|
|
*optptr++ = 4;
|
|
memcpy(optptr, s.serverid, 4);
|
|
return optptr + 4;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t *
|
|
add_req_ipaddr(uint8_t *optptr)
|
|
{
|
|
*optptr++ = DHCP_OPTION_REQ_IPADDR;
|
|
*optptr++ = 4;
|
|
memcpy(optptr, s.ipaddr.u16, 4);
|
|
return optptr + 4;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t *
|
|
add_req_options(uint8_t *optptr)
|
|
{
|
|
*optptr++ = DHCP_OPTION_REQ_LIST;
|
|
*optptr++ = 3;
|
|
*optptr++ = DHCP_OPTION_SUBNET_MASK;
|
|
*optptr++ = DHCP_OPTION_ROUTER;
|
|
*optptr++ = DHCP_OPTION_DNS_SERVER;
|
|
return optptr;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t *
|
|
add_end(uint8_t *optptr)
|
|
{
|
|
*optptr++ = DHCP_OPTION_END;
|
|
return optptr;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
create_msg(CC_REGISTER_ARG struct dhcp_msg *m)
|
|
{
|
|
m->op = DHCP_REQUEST;
|
|
m->htype = DHCP_HTYPE_ETHERNET;
|
|
m->hlen = s.mac_len;
|
|
m->hops = 0;
|
|
memcpy(m->xid, &xid, sizeof(m->xid));
|
|
m->secs = 0;
|
|
m->flags = UIP_HTONS(BOOTP_BROADCAST); /* Broadcast bit. */
|
|
/* uip_ipaddr_copy(m->ciaddr, uip_hostaddr);*/
|
|
memcpy(m->ciaddr, uip_hostaddr.u16, sizeof(m->ciaddr));
|
|
memset(m->yiaddr, 0, sizeof(m->yiaddr));
|
|
memset(m->siaddr, 0, sizeof(m->siaddr));
|
|
memset(m->giaddr, 0, sizeof(m->giaddr));
|
|
memcpy(m->chaddr, s.mac_addr, s.mac_len);
|
|
memset(&m->chaddr[s.mac_len], 0, sizeof(m->chaddr) - s.mac_len);
|
|
|
|
memset(m->sname, 0, sizeof(m->sname));
|
|
strcpy((char *)m->sname, "Thingsquare");
|
|
memset(m->file, 0, sizeof(m->file));
|
|
|
|
|
|
memcpy(m->options, magic_cookie, sizeof(magic_cookie));
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_discover(void)
|
|
{
|
|
uint8_t *end;
|
|
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
|
|
|
|
create_msg(m);
|
|
|
|
end = add_msg_type(&m->options[4], DHCPDISCOVER);
|
|
end = add_req_options(end);
|
|
end = add_end(end);
|
|
|
|
uip_send(uip_appdata, (int)(end - (uint8_t *)uip_appdata));
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_request(void)
|
|
{
|
|
uint8_t *end;
|
|
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
|
|
|
|
create_msg(m);
|
|
|
|
end = add_msg_type(&m->options[4], DHCPREQUEST);
|
|
end = add_server_id(end);
|
|
end = add_req_ipaddr(end);
|
|
end = add_end(end);
|
|
|
|
uip_send(uip_appdata, (int)(end - (uint8_t *)uip_appdata));
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t
|
|
parse_options(uint8_t *optptr, int len)
|
|
{
|
|
uint8_t *end = optptr + len;
|
|
uint8_t type = 0;
|
|
|
|
while(optptr < end) {
|
|
switch(*optptr) {
|
|
case DHCP_OPTION_SUBNET_MASK:
|
|
memcpy(s.netmask.u16, optptr + 2, 4);
|
|
break;
|
|
case DHCP_OPTION_ROUTER:
|
|
memcpy(s.default_router.u16, optptr + 2, 4);
|
|
break;
|
|
case DHCP_OPTION_DNS_SERVER:
|
|
memcpy(s.dnsaddr.u16, optptr + 2, 4);
|
|
break;
|
|
case DHCP_OPTION_MSG_TYPE:
|
|
type = *(optptr + 2);
|
|
break;
|
|
case DHCP_OPTION_SERVER_ID:
|
|
memcpy(s.serverid, optptr + 2, 4);
|
|
break;
|
|
case DHCP_OPTION_LEASE_TIME:
|
|
memcpy(s.lease_time, optptr + 2, 4);
|
|
break;
|
|
case DHCP_OPTION_END:
|
|
return type;
|
|
}
|
|
|
|
optptr += optptr[1] + 2;
|
|
}
|
|
return type;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t
|
|
parse_msg(void)
|
|
{
|
|
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
|
|
|
|
if(m->op == DHCP_REPLY &&
|
|
memcmp(m->xid, &xid, sizeof(xid)) == 0 &&
|
|
memcmp(m->chaddr, s.mac_addr, s.mac_len) == 0) {
|
|
memcpy(s.ipaddr.u16, m->yiaddr, 4);
|
|
return parse_options(&m->options[4], uip_datalen());
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Is this a "fresh" reply for me? If it is, return the type.
|
|
*/
|
|
static int
|
|
msg_for_me(void)
|
|
{
|
|
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
|
|
uint8_t *optptr = &m->options[4];
|
|
uint8_t *end = (uint8_t*)uip_appdata + uip_datalen();
|
|
|
|
if(m->op == DHCP_REPLY &&
|
|
memcmp(m->xid, &xid, sizeof(xid)) == 0 &&
|
|
memcmp(m->chaddr, s.mac_addr, s.mac_len) == 0) {
|
|
while(optptr < end) {
|
|
if(*optptr == DHCP_OPTION_MSG_TYPE) {
|
|
return *(optptr + 2);
|
|
} else if (*optptr == DHCP_OPTION_END) {
|
|
return -1;
|
|
}
|
|
optptr += optptr[1] + 2;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static
|
|
PT_THREAD(handle_dhcp(process_event_t ev, void *data))
|
|
{
|
|
clock_time_t ticks;
|
|
|
|
PT_BEGIN(&s.pt);
|
|
|
|
init:
|
|
xid++;
|
|
s.state = STATE_SENDING;
|
|
s.ticks = CLOCK_SECOND * 4;
|
|
while(1) {
|
|
while(ev != tcpip_event) {
|
|
tcpip_poll_udp(s.conn);
|
|
PT_YIELD(&s.pt);
|
|
}
|
|
send_discover();
|
|
etimer_set(&s.etimer, s.ticks);
|
|
do {
|
|
PT_YIELD(&s.pt);
|
|
if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPOFFER) {
|
|
parse_msg();
|
|
s.state = STATE_OFFER_RECEIVED;
|
|
goto selecting;
|
|
}
|
|
} while(!etimer_expired(&s.etimer));
|
|
|
|
if(s.ticks < CLOCK_SECOND * 60) {
|
|
s.ticks *= 2;
|
|
}
|
|
}
|
|
|
|
selecting:
|
|
s.ticks = CLOCK_SECOND;
|
|
do {
|
|
while(ev != tcpip_event) {
|
|
tcpip_poll_udp(s.conn);
|
|
PT_YIELD(&s.pt);
|
|
}
|
|
send_request();
|
|
etimer_set(&s.etimer, s.ticks);
|
|
do {
|
|
PT_YIELD(&s.pt);
|
|
if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPACK) {
|
|
parse_msg();
|
|
s.state = STATE_CONFIG_RECEIVED;
|
|
goto bound;
|
|
}
|
|
} while (!etimer_expired(&s.etimer));
|
|
|
|
if(s.ticks <= CLOCK_SECOND * 10) {
|
|
s.ticks += CLOCK_SECOND;
|
|
} else {
|
|
goto init;
|
|
}
|
|
} while(s.state != STATE_CONFIG_RECEIVED);
|
|
|
|
bound:
|
|
#if 0
|
|
printf("Got IP address %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.ipaddr));
|
|
printf("Got netmask %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.netmask));
|
|
printf("Got DNS server %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.dnsaddr));
|
|
printf("Got default router %d.%d.%d.%d\n",
|
|
uip_ipaddr_to_quad(&s.default_router));
|
|
printf("Lease expires in %ld seconds\n",
|
|
uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]));
|
|
#endif
|
|
|
|
ip64_dhcpc_configured(&s);
|
|
|
|
#define MAX_TICKS (~((clock_time_t)0) / 2)
|
|
#define MAX_TICKS32 (~((uint32_t)0))
|
|
#define IMIN(a, b) ((a) < (b) ? (a) : (b))
|
|
|
|
if((uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]))*CLOCK_SECOND/2
|
|
<= MAX_TICKS32) {
|
|
s.ticks = (uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1])
|
|
)*CLOCK_SECOND/2;
|
|
} else {
|
|
s.ticks = MAX_TICKS32;
|
|
}
|
|
|
|
while(s.ticks > 0) {
|
|
ticks = IMIN(s.ticks, MAX_TICKS);
|
|
s.ticks -= ticks;
|
|
etimer_set(&s.etimer, ticks);
|
|
PT_YIELD_UNTIL(&s.pt, etimer_expired(&s.etimer));
|
|
}
|
|
|
|
if((uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]))*CLOCK_SECOND/2
|
|
<= MAX_TICKS32) {
|
|
s.ticks = (uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1])
|
|
)*CLOCK_SECOND/2;
|
|
} else {
|
|
s.ticks = MAX_TICKS32;
|
|
}
|
|
|
|
/* renewing: */
|
|
do {
|
|
while(ev != tcpip_event) {
|
|
tcpip_poll_udp(s.conn);
|
|
PT_YIELD(&s.pt);
|
|
}
|
|
send_request();
|
|
ticks = IMIN(s.ticks / 2, MAX_TICKS);
|
|
s.ticks -= ticks;
|
|
etimer_set(&s.etimer, ticks);
|
|
do {
|
|
PT_YIELD(&s.pt);
|
|
if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPACK) {
|
|
parse_msg();
|
|
goto bound;
|
|
}
|
|
} while(!etimer_expired(&s.etimer));
|
|
} while(s.ticks >= CLOCK_SECOND*3);
|
|
|
|
/* rebinding: */
|
|
|
|
/* lease_expired: */
|
|
ip64_dhcpc_unconfigured(&s);
|
|
goto init;
|
|
|
|
PT_END(&s.pt);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
ip64_dhcpc_init(const void *mac_addr, int mac_len)
|
|
{
|
|
/* Although this is DHCPv4, we explicitly bind the socket to an IPv6
|
|
address so that it can operate over the ip64 bridge. */
|
|
uip_ip6addr_t v6addr;
|
|
uip_ip4addr_t v4addr;
|
|
struct uip_udp_conn *conn2;
|
|
|
|
s.mac_addr = mac_addr;
|
|
s.mac_len = mac_len;
|
|
|
|
s.state = STATE_INITIAL;
|
|
uip_ipaddr(&v4addr, 255,255,255,255);
|
|
ip64_addr_4to6(&v4addr, &v6addr);
|
|
s.conn = udp_new(&v6addr, UIP_HTONS(IP64_DHCPC_SERVER_PORT), NULL);
|
|
conn2 = udp_new(NULL, UIP_HTONS(IP64_DHCPC_SERVER_PORT), NULL);
|
|
if(s.conn != NULL) {
|
|
udp_bind(s.conn, UIP_HTONS(IP64_DHCPC_CLIENT_PORT));
|
|
}
|
|
if(conn2 != NULL) {
|
|
udp_bind(conn2, UIP_HTONS(IP64_DHCPC_CLIENT_PORT));
|
|
}
|
|
PT_INIT(&s.pt);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
ip64_dhcpc_appcall(process_event_t ev, void *data)
|
|
{
|
|
if(ev == tcpip_event || ev == PROCESS_EVENT_TIMER) {
|
|
handle_dhcp(ev, data);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
ip64_dhcpc_request(void)
|
|
{
|
|
uip_ipaddr_t ipaddr;
|
|
|
|
if(s.state == STATE_INITIAL) {
|
|
uip_ipaddr(&ipaddr, 0,0,0,0);
|
|
uip_sethostaddr(&ipaddr);
|
|
handle_dhcp(PROCESS_EVENT_NONE, NULL);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|