cae9bad97b
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@328 42af7a65-404d-4744-a932-0658087f49c3
430 lines
12 KiB
C
430 lines
12 KiB
C
/****************************************************************************
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* dhcpc.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Based heavily on portions of uIP:
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*
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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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* 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <time.h>
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#include <debug.h>
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#include <net/uip/uip.h>
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#include <net/uip/dhcpc.h>
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/* CLK_TCK is the frequency of the system clock (typically 100Hz) */
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#define CLOCK_SECOND CLK_TCK
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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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#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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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct dhcpc_state_internal
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{
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char state;
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sem_t sem;
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struct uip_udp_conn *conn;
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uint16 ticks;
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const void *mac_addr;
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int mac_len;
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struct dhcpc_state *result;
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};
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struct dhcp_msg
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{
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uint8 op, htype, hlen, hops;
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uint8 xid[4];
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uint16 secs, flags;
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uint8 ciaddr[4];
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uint8 yiaddr[4];
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uint8 siaddr[4];
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uint8 giaddr[4];
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uint8 chaddr[16];
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#ifndef CONFIG_NET_DHCP_LIGHT
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uint8 sname[64];
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uint8 file[128];
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#endif
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uint8 options[312];
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const uint8 xid[4] = {0xad, 0xde, 0x12, 0x23};
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static const uint8 magic_cookie[4] = {99, 130, 83, 99};
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static volatile struct dhcpc_state_internal *gpdhcpc;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static uint8 *add_msg_type(uint8 *optptr, uint8 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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static uint8 *add_server_id(struct dhcpc_state *presult, uint8 *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, presult->serverid, 4);
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return optptr + 4;
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}
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static uint8 *add_req_ipaddr(struct dhcpc_state *presult, uint8 *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, presult->ipaddr, 4);
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return optptr + 4;
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}
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static uint8 *add_req_options(uint8 *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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static uint8 *add_end(uint8 *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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static void create_msg(struct dhcpc_state_internal *pdhcpc, 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 = pdhcpc->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 = 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, 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, pdhcpc->mac_addr, pdhcpc->mac_len);
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memset(&m->chaddr[pdhcpc->mac_len], 0, sizeof(m->chaddr) - pdhcpc->mac_len);
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#ifndef CONFIG_NET_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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static void send_discover(struct dhcpc_state_internal *pdhcpc)
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{
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uint8 *end;
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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create_msg(pdhcpc, 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, end - (uint8 *)uip_appdata);
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}
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static void send_request(struct dhcpc_state_internal *pdhcpc)
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{
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uint8 *end;
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struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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create_msg(pdhcpc, m);
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end = add_msg_type(&m->options[4], DHCPREQUEST);
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end = add_server_id(pdhcpc->result, end);
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end = add_req_ipaddr(pdhcpc->result, end);
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end = add_end(end);
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uip_send(uip_appdata, end - (uint8 *)uip_appdata);
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}
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static uint8 parse_options(struct dhcpc_state *presult, uint8 *optptr, int len)
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{
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uint8 *end = optptr + len;
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uint8 type = 0;
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while (optptr < end)
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{
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switch(*optptr)
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{
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case DHCP_OPTION_SUBNET_MASK:
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memcpy(presult->netmask, optptr + 2, 4);
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break;
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case DHCP_OPTION_ROUTER:
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memcpy(presult->default_router, optptr + 2, 4);
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break;
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case DHCP_OPTION_DNS_SERVER:
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memcpy(presult->dnsaddr, 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(presult->serverid, optptr + 2, 4);
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break;
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case DHCP_OPTION_LEASE_TIME:
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memcpy(presult->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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static uint8 parse_msg(struct dhcpc_state_internal *pdhcpc)
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{
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struct dhcpc_state *presult = pdhcpc->result;
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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, pdhcpc->mac_addr, pdhcpc->mac_len) == 0)
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{
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memcpy(presult->ipaddr, m->yiaddr, 4);
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return parse_options(presult, &m->options[4], uip_datalen());
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}
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return 0;
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}
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static void handle_dhcp(struct dhcpc_state_internal *pdhcpc)
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{
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struct dhcpc_state *presult = pdhcpc->result;
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restart:
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pdhcpc->state = STATE_SENDING;
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pdhcpc->ticks = CLOCK_SECOND;
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do
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{
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/* Send the command */
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send_discover(pdhcpc);
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/* Wait for the response */
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uip_event_timedwait(UIP_NEWDATA, CLOCK_SECOND);
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if (uip_newdata() && parse_msg(pdhcpc) == DHCPOFFER)
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{
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pdhcpc->state = STATE_OFFER_RECEIVED;
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break;
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}
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if (pdhcpc->ticks < CLOCK_SECOND * 60)
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{
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pdhcpc->ticks *= 2;
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}
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}
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while(pdhcpc->state != STATE_OFFER_RECEIVED);
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pdhcpc->ticks = CLOCK_SECOND;
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do
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{
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/* Send the request */
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send_request(pdhcpc);
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/* Then wait to received the response */
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uip_event_timedwait(UIP_NEWDATA, CLOCK_SECOND);
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if (uip_newdata() && parse_msg(pdhcpc) == DHCPACK)
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{
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pdhcpc->state = STATE_CONFIG_RECEIVED;
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break;
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}
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if (pdhcpc->ticks <= CLOCK_SECOND * 10)
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{
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pdhcpc->ticks += CLOCK_SECOND;
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}
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else
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{
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goto restart;
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}
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}
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while(pdhcpc->state != STATE_CONFIG_RECEIVED);
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dbg("Got IP address %d.%d.%d.%d\n",
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uip_ipaddr1(presult->ipaddr), uip_ipaddr2(presult->ipaddr),
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uip_ipaddr3(presult->ipaddr), uip_ipaddr4(presult->ipaddr));
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dbg("Got netmask %d.%d.%d.%d\n",
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uip_ipaddr1(presult->netmask), uip_ipaddr2(presult->netmask),
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uip_ipaddr3(presult->netmask), uip_ipaddr4(presult->netmask));
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dbg("Got DNS server %d.%d.%d.%d\n",
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uip_ipaddr1(presult->dnsaddr), uip_ipaddr2(presult->dnsaddr),
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uip_ipaddr3(presult->dnsaddr), uip_ipaddr4(presult->dnsaddr));
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dbg("Got default router %d.%d.%d.%d\n",
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uip_ipaddr1(presult->default_router), uip_ipaddr2(presult->default_router),
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uip_ipaddr3(presult->default_router), uip_ipaddr4(presult->default_router));
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dbg("Lease expires in %ld seconds\n",
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ntohs(presult->lease_time[0])*65536ul + ntohs(presult->lease_time[1]));
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}
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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void *dhcpc_open(const void *mac_addr, int mac_len)
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{
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uip_ipaddr_t addr;
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struct dhcpc_state_internal *pdhcpc;
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pdhcpc = (struct dhcpc_state_internal *)malloc(sizeof(struct dhcpc_state_internal));
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if (pdhcpc)
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{
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memset(pdhcpc, 0, sizeof(struct dhcpc_state_internal));
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pdhcpc->mac_addr = mac_addr;
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pdhcpc->mac_len = mac_len;
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pdhcpc->state = STATE_INITIAL;
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sem_init(&pdhcpc->sem, 0, 0);
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uip_ipaddr(addr, 255,255,255,255);
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pdhcpc->conn = uip_udp_new(&addr, HTONS(DHCPC_SERVER_PORT));
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if (pdhcpc->conn != NULL)
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{
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uip_udp_bind(pdhcpc->conn, HTONS(DHCPC_CLIENT_PORT));
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}
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}
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return (void*)pdhcpc;
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}
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void dhcpc_close(void *handle)
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{
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struct dchcpc_state_internal *pdhcpc = (struct dchcpc_state_internal *)handle;
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if (pdhcpc)
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{
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free(pdhcpc);
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}
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}
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/* This function is called by the UIP interrupt handling logic whenevent an
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* event of interest occurs.
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*/
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void uip_interrupt_udp_event(void)
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{
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#error OBSOLETE
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if (gpdhcpc)
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{
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sem_post(&gpdhcpc->sem);
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}
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}
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int dhcpc_request(void *handle, struct dhcpc_state *ds)
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{
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struct dhcpc_state_internal *pdhcpc = (struct dhcpc_state_internal *)handle;
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uint16 ipaddr[2];
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if (pdhcpc->state == STATE_INITIAL)
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{
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uip_ipaddr(ipaddr, 0,0,0,0);
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uip_sethostaddr(ipaddr);
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}
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pdhcpc->result = ds;
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gpdhcpc = pdhcpc;
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sem_wait(&pdhcpc->sem);
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gpdhcpc = NULL;
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handle_dhcp(pdhcpc);
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return OK;
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}
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