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6f1e5c74ef
nuttx/netutils/dhcpc/dhcpc.c
patacongo 6f1e5c74ef Import of uIP 1.0 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@308 42af7a65-404d-4744-a932-0658087f49c3
2007-08-26 23:12:17 +00:00

391 lines
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C
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/************************************************************
* dhcpc.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Based heavily on portions of uIP:
*
* 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 NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
************************************************************/
/************************************************************
* Included Files
************************************************************/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <time.h>
#include <debug.h>
#include <net/uip/uip.h>
#include "dhcpc.h"
/************************************************************
* Definitions
************************************************************/
/* CLK_TCK is the frequency of the system clock (typically 100Hz) */
#define CLOCK_SECOND CLK_TCK
#define STATE_INITIAL 0
#define STATE_SENDING 1
#define STATE_OFFER_RECEIVED 2
#define STATE_CONFIG_RECEIVED 3
#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
/************************************************************
* Private Types
************************************************************/
struct dhcp_msg
{
uint8 op, htype, hlen, hops;
uint8 xid[4];
uint16 secs, flags;
uint8 ciaddr[4];
uint8 yiaddr[4];
uint8 siaddr[4];
uint8 giaddr[4];
uint8 chaddr[16];
#ifndef CONFIG_UIP_DHCP_LIGHT
uint8 sname[64];
uint8 file[128];
#endif
uint8 options[312];
};
/************************************************************
* Private Data
************************************************************/
static struct dhcpc_state s;
static const uint8 xid[4] = {0xad, 0xde, 0x12, 0x23};
static const uint8 magic_cookie[4] = {99, 130, 83, 99};
/************************************************************
* Private Functions
************************************************************/
static uint8 *add_msg_type(uint8 *optptr, uint8 type)
{
*optptr++ = DHCP_OPTION_MSG_TYPE;
*optptr++ = 1;
*optptr++ = type;
return optptr;
}
static uint8 *add_server_id(uint8 *optptr)
{
*optptr++ = DHCP_OPTION_SERVER_ID;
*optptr++ = 4;
memcpy(optptr, s.serverid, 4);
return optptr + 4;
}
static uint8 *add_req_ipaddr(uint8 *optptr)
{
*optptr++ = DHCP_OPTION_REQ_IPADDR;
*optptr++ = 4;
memcpy(optptr, s.ipaddr, 4);
return optptr + 4;
}
static uint8 *add_req_options(uint8 *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 *add_end(uint8 *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 CONFIG_UIP_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)
{
uint8 *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 - (uint8 *)uip_appdata);
}
static void send_request(void)
{
uint8 *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 - (uint8 *)uip_appdata);
}
static uint8 parse_options(uint8 *optptr, int len)
{
uint8 *end = optptr + len;
uint8 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 uint8 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 void handle_dhcp(void)
{
restart:
s.state = STATE_SENDING;
s.ticks = CLOCK_SECOND;
do
{
/* Send the command */
send_discover();
/* Wait for the response */
uip_event_timedwait(UIP_NEWDATA, CLOCK_SECOND);
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 the request */
send_request();
/* Then wait to received the response */
uip_event_timedwait(UIP_NEWDATA, CLOCK_SECOND);
if (uip_newdata() && parse_msg() == DHCPACK)
{
s.state = STATE_CONFIG_RECEIVED;
break;
}
if (s.ticks <= CLOCK_SECOND * 10)
{
s.ticks += CLOCK_SECOND;
}
else
{
goto restart;
}
}
while(s.state != STATE_CONFIG_RECEIVED);
dbg("Got IP address %d.%d.%d.%d\n",
uip_ipaddr1(s.ipaddr), uip_ipaddr2(s.ipaddr),
uip_ipaddr3(s.ipaddr), uip_ipaddr4(s.ipaddr));
dbg("Got netmask %d.%d.%d.%d\n",
uip_ipaddr1(s.netmask), uip_ipaddr2(s.netmask),
uip_ipaddr3(s.netmask), uip_ipaddr4(s.netmask));
dbg("Got DNS server %d.%d.%d.%d\n",
uip_ipaddr1(s.dnsaddr), uip_ipaddr2(s.dnsaddr),
uip_ipaddr3(s.dnsaddr), uip_ipaddr4(s.dnsaddr));
dbg("Got default router %d.%d.%d.%d\n",
uip_ipaddr1(s.default_router), uip_ipaddr2(s.default_router),
uip_ipaddr3(s.default_router), uip_ipaddr4(s.default_router));
dbg("Lease expires in %ld seconds\n",
ntohs(s.lease_time[0])*65536ul + ntohs(s.lease_time[1]));
dhcpc_configured(&s);
pthread_exit(NULL);
}
/************************************************************
* Global Functions
************************************************************/
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));
}
}
/* This function is called by the UIP interrupt handling logic whenevent an
* event of interest occurs.
*/
void uip_interrupt_udp_event(void)
{
handle_dhcp();
}
void dhcpc_request(void)
{
uint16 ipaddr[2];
if (s.state == STATE_INITIAL)
{
uip_ipaddr(ipaddr, 0,0,0,0);
uip_sethostaddr(ipaddr);
}
}
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