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openblt/Target/Source/third_party/uip/apps/dhcpc/dhcpc.c

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/*
* 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 uIP TCP/IP stack
*
* @(#)$Id: dhcpc.c,v 1.2 2006/06/11 21:46:37 adam Exp $
*/
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include "uip.h"
#include "dhcpc.h"
#include "uip_timer.h"
#include "pt.h"
#define STATE_INITIAL 0
#define STATE_SENDING 1
#define STATE_OFFER_RECEIVED 2
#define STATE_CONFIG_RECEIVED 3
static struct dhcpc_state s;
struct dhcp_msg
{
u8_t op, htype, hlen, hops;
u8_t xid[4];
u16_t secs, flags;
u8_t ciaddr[4];
u8_t yiaddr[4];
u8_t siaddr[4];
u8_t giaddr[4];
u8_t chaddr[16];
#ifndef UIP_CONF_DHCP_LIGHT
u8_t sname[64];
u8_t file[128];
#endif
u8_t options[312];
};
#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 DHCPC_SERVER_PORT 67
#define 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 const u8_t xid[4] = {0xad, 0xde, 0x12, 0x23};
static const u8_t magic_cookie[4] = {99, 130, 83, 99};
static void dhcpc_configured(const struct dhcpc_state *s);
static void dhcpc_unconfigured(void);
/*---------------------------------------------------------------------------*/
static u8_t *
add_msg_type(u8_t *optptr, u8_t type)
{
*optptr++ = DHCP_OPTION_MSG_TYPE;
*optptr++ = 1;
*optptr++ = type;
return optptr;
}
/*---------------------------------------------------------------------------*/
static u8_t *
add_server_id(u8_t *optptr)
{
*optptr++ = DHCP_OPTION_SERVER_ID;
*optptr++ = 4;
memcpy(optptr, s.serverid, 4);
return optptr + 4;
}
/*---------------------------------------------------------------------------*/
static u8_t *
add_req_ipaddr(u8_t *optptr)
{
*optptr++ = DHCP_OPTION_REQ_IPADDR;
*optptr++ = 4;
memcpy(optptr, s.ipaddr, 4);
return optptr + 4;
}
/*---------------------------------------------------------------------------*/
static u8_t *
add_req_options(u8_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 u8_t *
add_end(u8_t *optptr)
{
*optptr++ = DHCP_OPTION_END;
return optptr;
}
/*---------------------------------------------------------------------------*/
static void
create_msg(register 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 = HTONS(BOOTP_BROADCAST); /* Broadcast bit. */
/* uip_ipaddr_copy(m->ciaddr, uip_hostaddr);*/
memcpy(m->ciaddr, uip_hostaddr, 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);
#ifndef UIP_CONF_DHCP_LIGHT
memset(m->sname, 0, sizeof(m->sname));
memset(m->file, 0, sizeof(m->file));
#endif
memcpy(m->options, magic_cookie, sizeof(magic_cookie));
}
/*---------------------------------------------------------------------------*/
static void
send_discover(void)
{
u8_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, end - (u8_t *)uip_appdata);
}
/*---------------------------------------------------------------------------*/
static void
send_request(void)
{
u8_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, end - (u8_t *)uip_appdata);
}
/*---------------------------------------------------------------------------*/
static u8_t
parse_options(u8_t *optptr, int len)
{
u8_t *end = optptr + len;
u8_t type = 0;
while (optptr < end)
{
switch (*optptr)
{
case DHCP_OPTION_SUBNET_MASK:
memcpy(s.netmask, optptr + 2, 4);
break;
case DHCP_OPTION_ROUTER:
memcpy(s.default_router, optptr + 2, 4);
break;
case DHCP_OPTION_DNS_SERVER:
memcpy(s.dnsaddr, 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 u8_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, m->yiaddr, 4);
return parse_options(&m->options[4], uip_datalen());
}
return 0;
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_dhcp(void))
{
unsigned long lease_renew_time;
PT_BEGIN(&s.pt);
/* try_again:*/
s.state = STATE_SENDING;
s.ticks = CLOCK_SECOND;
do
{
send_discover();
timer_set(&s.timer, s.ticks);
PT_YIELD(&s.pt);
PT_WAIT_UNTIL(&s.pt, uip_newdata() || timer_expired(&s.timer));
if (uip_newdata() && parse_msg() == DHCPOFFER)
{
s.state = STATE_OFFER_RECEIVED;
break;
}
if (s.ticks < CLOCK_SECOND * 60)
{
s.ticks *= 2;
}
}
while (s.state != STATE_OFFER_RECEIVED);
s.ticks = CLOCK_SECOND;
do
{
send_request();
timer_set(&s.timer, s.ticks);
PT_YIELD(&s.pt);
PT_WAIT_UNTIL(&s.pt, uip_newdata() || timer_expired(&s.timer));
if (uip_newdata() && parse_msg() == DHCPACK)
{
s.state = STATE_CONFIG_RECEIVED;
break;
}
if (s.ticks <= CLOCK_SECOND * 10)
{
s.ticks += CLOCK_SECOND;
}
else
{
PT_RESTART(&s.pt);
}
}
while (s.state != STATE_CONFIG_RECEIVED);
/* inform the application that a DHCP configuration was received such that it can
* handle further processing of it.
*/
dhcpc_configured(&s);
/* keep renewing the lease each time 50% of the lease time expired. */
while (1)
{
/* calculate 50% lease time in seconds. */
lease_renew_time = ((unsigned long)(ntohs(s.lease_time[0])) << 16u);
lease_renew_time |= (ntohs(s.lease_time[1]));
lease_renew_time /= 2;
/* the internal timer (s.timer) is of type clock_time_t, so make sure the clock ticks
* equivalent to 50% of the lease renewal time would actually fit. note that
* clock_time_t is type defined as an int.
*/
if ((lease_renew_time * CLOCK_SECOND) <= INT_MAX)
{
s.ticks = lease_renew_time * CLOCK_SECOND;
}
else
{
s.ticks = INT_MAX;
}
/* now wait for the timer to expire. */
timer_set(&s.timer, s.ticks);
PT_YIELD(&s.pt);
PT_WAIT_UNTIL(&s.pt, timer_expired(&s.timer));
/* since a lease is already available, there is no need to request a new offer via
* the discover message. it suffices to sent the request message and wait for the
* acknowledge.
*/
s.state = STATE_OFFER_RECEIVED;
s.ticks = CLOCK_SECOND;
/* keep in mind that DHCP request messages must come for source address 0.0.0.0, so
* reinitialize the DHCP request messages and inform the application that the
* DHCP configuration is now temporarily reset until the lease was successfully
* renewed.
*/
dhcpc_request();
dhcpc_unconfigured();
do
{
send_request();
timer_set(&s.timer, s.ticks);
PT_YIELD(&s.pt);
PT_WAIT_UNTIL(&s.pt, uip_newdata() || timer_expired(&s.timer));
if (uip_newdata() && parse_msg() == DHCPACK)
{
/* renewal successful. */
s.state = STATE_CONFIG_RECEIVED;
break;
}
if (s.ticks <= CLOCK_SECOND * 10)
{
s.ticks += CLOCK_SECOND;
}
else
{
/* the lease could not be renewed, so restart this entire thread from the
* begin to attempt to re-bind.
*/
PT_RESTART(&s.pt);
}
}
while (s.state != STATE_CONFIG_RECEIVED);
/* inform the application that a DHCP configuration was received such that it can
* handle further processing of it.
*/
dhcpc_configured(&s);
}
/* code won't get here but this statement is still required at the end of a thread
* function.
*/
PT_END(&s.pt);
}
/*---------------------------------------------------------------------------*/
void
dhcpc_init(const void *mac_addr, int mac_len)
{
uip_ipaddr_t addr;
s.mac_addr = mac_addr;
s.mac_len = mac_len;
s.state = STATE_INITIAL;
uip_ipaddr(addr, 255,255,255,255);
s.conn = uip_udp_new(&addr, HTONS(DHCPC_SERVER_PORT));
if (s.conn != NULL)
{
uip_udp_bind(s.conn, HTONS(DHCPC_CLIENT_PORT));
}
PT_INIT(&s.pt);
}
/*---------------------------------------------------------------------------*/
void
dhcpc_appcall(void)
{
handle_dhcp();
}
/*---------------------------------------------------------------------------*/
void
dhcpc_request(void)
{
uip_ipaddr_t ipaddr;
uip_ipaddr(ipaddr, 0,0,0,0);
uip_sethostaddr(ipaddr);
}
/*---------------------------------------------------------------------------*/
void
dhcpc_configured(const struct dhcpc_state *s)
{
/* set the IP address received from the DHCP server. */
uip_sethostaddr(&s->ipaddr);
/* set the network mask received from the DHCP server. */
uip_setnetmask(&s->netmask);
/* set the gateway address received from the DHCP server. */
uip_setdraddr(&s->default_router);
}
/*---------------------------------------------------------------------------*/
void
dhcpc_unconfigured(void)
{
/* nothing needs to be done here. */
}
/*---------------------------------------------------------------------------*/
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