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nuttx/netutils/dhcpc/dhcpc.c
patacongo 5fe8b2974d Add examples/dhcpd 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@413 42af7a65-404d-4744-a932-0658087f49c3
2007-11-30 20:46:29 +00:00

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/****************************************************************************
* netutils/dhcpc/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.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#include <debug.h>
#include <net/uip/uip.h>
#include <net/uip/dhcpc.h>
#include <net/uip/uip-lib.h>
/****************************************************************************
* Definitions
****************************************************************************/
#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
#define BUFFER_SIZE 256
/****************************************************************************
* Private Types
****************************************************************************/
struct dhcp_msg
{
uint8 op;
uint8 htype;
uint8 hlen;
uint8 hops;
uint8 xid[4];
uint16 secs;
uint16 flags;
uint8 ciaddr[4];
uint8 yiaddr[4];
uint8 siaddr[4];
uint8 giaddr[4];
uint8 chaddr[16];
#ifndef CONFIG_NET_DHCP_LIGHT
uint8 sname[64];
uint8 file[128];
#endif
uint8 options[312];
};
struct dhcpc_state_s
{
struct uip_udp_conn *ds_conn;
const void *ds_macaddr;
int ds_maclen;
int sockfd;
struct dhcp_msg packet;
};
/****************************************************************************
* Private Data
****************************************************************************/
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(struct dhcpc_state *presult, uint8 *optptr)
{
*optptr++ = DHCP_OPTION_SERVER_ID;
*optptr++ = 4;
memcpy(optptr, presult->serverid, 4);
return optptr + 4;
}
static uint8 *add_req_ipaddr(struct dhcpc_state *presult, uint8 *optptr)
{
*optptr++ = DHCP_OPTION_REQ_IPADDR;
*optptr++ = 4;
memcpy(optptr, &presult->ipaddr.s_addr, 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(struct dhcpc_state_s *pdhcpc)
{
struct in_addr addr;
memset(&pdhcpc->packet, 0, sizeof(struct dhcp_msg));
pdhcpc->packet.op = DHCP_REQUEST;
pdhcpc->packet.htype = DHCP_HTYPE_ETHERNET;
pdhcpc->packet.hlen = pdhcpc->ds_maclen;
memcpy(pdhcpc->packet.xid, xid, 4);
pdhcpc->packet.flags = HTONS(BOOTP_BROADCAST); /* Broadcast bit. */
uip_gethostaddr("eth0", &addr);
memcpy(&pdhcpc->packet.ciaddr, &addr.s_addr, 4);
memcpy(pdhcpc->packet.chaddr, pdhcpc->ds_macaddr, pdhcpc->ds_maclen);
memset(&pdhcpc->packet.chaddr[pdhcpc->ds_maclen], 0, 16 - pdhcpc->ds_maclen);
memcpy(pdhcpc->packet.options, magic_cookie, sizeof(magic_cookie));
}
static int send_discover(struct dhcpc_state_s *pdhcpc)
{
struct sockaddr_in addr;
uint8 *pend;
int len;
dbg("Calling create_msg\n");
create_msg(pdhcpc);
pend = &pdhcpc->packet.options[4];
pend = add_msg_type(pend, DHCPDISCOVER);
pend = add_req_options(pend);
pend = add_end(pend);
len = pend - (uint8*)&pdhcpc->packet;
addr.sin_family = AF_INET;
addr.sin_port = HTONS(DHCPC_SERVER_PORT);
addr.sin_addr.s_addr = INADDR_BROADCAST;
dbg("Calling sendto, len=%d\n", len);
return sendto(pdhcpc->sockfd, &pdhcpc->packet, len, 0,
(struct sockaddr*)&addr, sizeof(struct sockaddr_in));
}
static int send_request(struct dhcpc_state_s *pdhcpc, struct dhcpc_state *presult)
{
struct sockaddr_in addr;
uint8 *pend;
int len;
create_msg(pdhcpc);
pend = &pdhcpc->packet.options[4];
pend = add_msg_type(pend, DHCPREQUEST);
pend = add_server_id(presult, pend);
pend = add_req_ipaddr(presult, pend);
pend = add_end(pend);
len = pend - (uint8*)&pdhcpc->packet;
addr.sin_family = AF_INET;
addr.sin_port = HTONS(DHCPC_SERVER_PORT);
addr.sin_addr.s_addr = INADDR_BROADCAST;
return sendto(pdhcpc->sockfd, &pdhcpc->packet, len, 0,
(struct sockaddr*)&addr, sizeof(struct sockaddr_in));
}
static uint8 parse_options(struct dhcpc_state *presult, uint8 *optptr, int len)
{
uint8 *end = optptr + len;
uint8 type = 0;
while (optptr < end)
{
switch(*optptr)
{
case DHCP_OPTION_SUBNET_MASK:
memcpy(&presult->netmask.s_addr, optptr + 2, 4);
break;
case DHCP_OPTION_ROUTER:
memcpy(&presult->default_router.s_addr, optptr + 2, 4);
break;
case DHCP_OPTION_DNS_SERVER:
memcpy(&presult->dnsaddr.s_addr, optptr + 2, 4);
break;
case DHCP_OPTION_MSG_TYPE:
type = *(optptr + 2);
break;
case DHCP_OPTION_SERVER_ID:
memcpy(presult->serverid, optptr + 2, 4);
break;
case DHCP_OPTION_LEASE_TIME:
memcpy(presult->lease_time, optptr + 2, 4);
break;
case DHCP_OPTION_END:
return type;
}
optptr += optptr[1] + 2;
}
return type;
}
static uint8 parse_msg(struct dhcpc_state_s *pdhcpc, int buflen,
struct dhcpc_state *presult)
{
if (pdhcpc->packet.op == DHCP_REPLY &&
memcmp(pdhcpc->packet.xid, xid, sizeof(xid)) == 0 &&
memcmp(pdhcpc->packet.chaddr, pdhcpc->ds_macaddr, pdhcpc->ds_maclen) == 0)
{
memcpy(&presult->ipaddr.s_addr, pdhcpc->packet.yiaddr, 4);
return parse_options(presult, &pdhcpc->packet.options[4], buflen);
}
return 0;
}
/****************************************************************************
* Global Functions
****************************************************************************/
void *dhcpc_open(const void *macaddr, int maclen)
{
struct dhcpc_state_s *pdhcpc;
struct sockaddr_in addr;
struct timeval tv;
/* Allocate an internal DHCP structure */
pdhcpc = (struct dhcpc_state_s *)malloc(sizeof(struct dhcpc_state_s));
if (pdhcpc)
{
/* Initialize the allocated structure */
memset(pdhcpc, 0, sizeof(struct dhcpc_state_s));
pdhcpc->ds_macaddr = macaddr;
pdhcpc->ds_maclen = maclen;
/* Create a UDP socket */
pdhcpc->sockfd = socket(PF_INET, SOCK_DGRAM, 0);
if (pdhcpc->sockfd < 0)
{
free(pdhcpc);
return NULL;
}
/* bind the socket */
addr.sin_family = AF_INET;
addr.sin_port = HTONS(DHCPC_CLIENT_PORT);
addr.sin_addr.s_addr = INADDR_ANY;
if (bind(pdhcpc->sockfd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) < 0)
{
close(pdhcpc->sockfd);
free(pdhcpc);
return NULL;
}
/* Configure for read timeouts */
tv.tv_sec = 30;
tv.tv_usec = 0;
if (setsockopt(pdhcpc->sockfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval)) < 0)
{
close(pdhcpc->sockfd);
free(pdhcpc);
return NULL;
}
}
dbg("Return %p\n", pdhcpc);
return (void*)pdhcpc;
}
void dhcpc_close(void *handle)
{
struct dchcpc_state_internal *pdhcpc = (struct dchcpc_state_internal *)handle;
if (pdhcpc)
{
free(pdhcpc);
}
}
int dhcpc_request(void *handle, struct dhcpc_state *presult)
{
struct dhcpc_state_s *pdhcpc = (struct dhcpc_state_s *)handle;
ssize_t result;
int state;
/* Loop until we receive the offer */
dbg("Handle %p\n", handle);
do
{
state = STATE_SENDING;
do
{
/* Send the command */
dbg("Send DHCPDISCOVER, @4=%08x\n", *(uint32*)4);
if (send_discover(pdhcpc) < 0)
{
return ERROR;
}
/* Get the response */
dbg("Sent DHCPDISCOVER\n");
result = recv(pdhcpc->sockfd, &pdhcpc->packet, sizeof(struct dhcp_msg), 0);
dbg("recv returned %d\n");
if (result >= 0)
{
dbg("Calling parse_msg\n");
if (parse_msg(pdhcpc, result, presult) == DHCPOFFER)
{
dbg("Received DHCPOFFER\n");
state = STATE_OFFER_RECEIVED;
}
}
else if (*get_errno_ptr() != EAGAIN)
{
/* An error other than a timeout was received */
return ERROR;
}
}
while (state != STATE_OFFER_RECEIVED);
do
{
/* Send the request */
dbg("Send DHCPREQUEST\n");
if (send_request(pdhcpc, presult) < 0)
{
return ERROR;
}
/* Get the response */
result = recv(pdhcpc->sockfd, &pdhcpc->packet, sizeof(struct dhcp_msg), 0);
if (result >= 0)
{
if (parse_msg(pdhcpc, result, presult) == DHCPACK)
{
dbg("Received ACK\n");
state = STATE_CONFIG_RECEIVED;
}
}
else if (*get_errno_ptr() != EAGAIN)
{
/* An error other than a timeout was received */
return ERROR;
}
}
while (state != STATE_CONFIG_RECEIVED);
}
while(state != STATE_CONFIG_RECEIVED);
dbg("Got IP address %d.%d.%d.%d\n",
(presult->ipaddr.s_addr >> 24 ) & 0xff,
(presult->ipaddr.s_addr >> 16 ) & 0xff,
(presult->ipaddr.s_addr >> 8 ) & 0xff,
(presult->ipaddr.s_addr ) & 0xff);
dbg("Got netmask %d.%d.%d.%d\n",
(presult->netmask.s_addr >> 24 ) & 0xff,
(presult->netmask.s_addr >> 16 ) & 0xff,
(presult->netmask.s_addr >> 8 ) & 0xff,
(presult->netmask.s_addr ) & 0xff);
dbg("Got DNS server %d.%d.%d.%d\n",
(presult->dnsaddr.s_addr >> 24 ) & 0xff,
(presult->dnsaddr.s_addr >> 16 ) & 0xff,
(presult->dnsaddr.s_addr >> 8 ) & 0xff,
(presult->dnsaddr.s_addr ) & 0xff);
dbg("Got default router %d.%d.%d.%d\n",
(presult->default_router.s_addr >> 24 ) & 0xff,
(presult->default_router.s_addr >> 16 ) & 0xff,
(presult->default_router.s_addr >> 8 ) & 0xff,
(presult->default_router.s_addr ) & 0xff);
dbg("Lease expires in %ld seconds\n",
ntohs(presult->lease_time[0])*65536ul + ntohs(presult->lease_time[1]));
return OK;
}
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