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