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osd-contiki/cpu/arm/common/usb/cdc-eth/dhcps.c

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USB CDC-Ethernet class
2009-07-11 16:37:11 +02:00
/* Adapted by Simon Berg from net/dhcpc.c */
/*
* 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 Contiki operating system.
*
* @(#)$Id: dhcps.c,v 1.1 2009/07/11 14:37:11 ksb Exp $
*/
#include <stdio.h>
#include <string.h>
#include <uip_arp.h>
#include "contiki.h"
#include "contiki-net.h"
#include "dhcps.h"
struct dhcp_msg {
uint8_t op, htype, hlen, hops;
uint8_t xid[4];
uint16_t secs, flags;
uint8_t ciaddr[4];
uint8_t yiaddr[4];
uint8_t siaddr[4];
uint8_t giaddr[4];
uint8_t chaddr[16];
#ifndef UIP_CONF_DHCP_LIGHT
uint8_t sname[64];
uint8_t file[128];
#endif
uint8_t options[312];
} CC_BYTE_ALIGNED;
#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 DHCPS_SERVER_PORT 67
#define DHCPS_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 DHCPINFORM 8
#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 LEASE_FLAGS_ALLOCATED 0x01 /* Lease with an allocated address*/
#define LEASE_FLAGS_VALID 0x02 /* Contains a valid but
possibly outdated lease */
static const struct dhcps_config *config;
static uint8_t *
find_option(uint8_t option)
{
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
uint8_t *optptr = &m->options[4];
uint8_t *end = (uint8_t*)uip_appdata + uip_datalen();
while(optptr < end && *optptr != DHCP_OPTION_END) {
if(*optptr == option) {
return optptr;
}
optptr += optptr[1] + 2;
}
return NULL;
}
static const uint8_t magic_cookie[4] = {99, 130, 83, 99};
static int
check_cookie(void)
{
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
return memcmp(m->options, magic_cookie, 4) == 0;
}
/* Finds any valid lease for a given MAC address */
static struct dhcps_client_lease *
lookup_lease_mac(const uint8_t *chaddr, uint8_t hlen)
{
struct dhcps_client_lease *lease = config->leases;
struct dhcps_client_lease *end = config->leases + config->num_leases;
while(lease != end) {
if (lease->flags & LEASE_FLAGS_VALID
&& memcmp(lease->chaddr, chaddr, hlen) == 0) {
return lease;
}
lease++;
}
return NULL;
}
static struct dhcps_client_lease *
lookup_lease_ip(const uip_ipaddr_t *ip)
{
struct dhcps_client_lease *lease = config->leases;
struct dhcps_client_lease *end = config->leases + config->num_leases;
while(lease != end) {
if (uip_ipaddr_cmp(&lease->ipaddr, ip)) {
return lease;
}
lease++;
}
return NULL;
}
static struct dhcps_client_lease *
find_free_lease(void)
{
struct dhcps_client_lease *found = NULL;
struct dhcps_client_lease *lease = config->leases;
struct dhcps_client_lease *end = config->leases + config->num_leases;
while(lease != end) {
if (!(lease->flags & LEASE_FLAGS_VALID)) return lease;
if (!(lease->flags & LEASE_FLAGS_ALLOCATED)) found = lease;
lease++;
}
return found;
}
struct dhcps_client_lease *
init_lease(struct dhcps_client_lease *lease,
const uint8_t *chaddr, uint8_t hlen)
{
if (lease) {
memcpy(lease->chaddr, chaddr, hlen);
lease->flags = LEASE_FLAGS_VALID;
}
return lease;
}
static struct dhcps_client_lease *
choose_address()
{
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
struct dhcps_client_lease *lease;
lease = lookup_lease_mac(m->chaddr, m->hlen);
if (lease) {
return lease;
}
{
uint8_t *opt;
opt = find_option(DHCP_OPTION_REQ_IPADDR);
if (opt && (lease = lookup_lease_ip((uip_ipaddr_t*)&opt[2]))
&& !(lease->flags & LEASE_FLAGS_ALLOCATED)) {
return init_lease(lease, m->chaddr,m->hlen);
}
}
lease = find_free_lease();
if (lease) {
return init_lease(lease, m->chaddr,m->hlen);
}
return NULL;
}
static struct dhcps_client_lease *
allocate_address()
{
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
struct dhcps_client_lease *lease;
lease = lookup_lease_mac(m->chaddr, m->hlen);
if (!lease) {
uint8_t *opt;
opt = find_option(DHCP_OPTION_REQ_IPADDR);
if (!(opt && (lease = lookup_lease_ip((uip_ipaddr_t*)&opt[2]))
&& !(lease->flags & LEASE_FLAGS_ALLOCATED))) {
return NULL;
}
}
lease->lease_end = clock_seconds()+config->default_lease_time;
lease->flags |= LEASE_FLAGS_ALLOCATED;
return lease;
}
static struct dhcps_client_lease *
release_address()
{
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
struct dhcps_client_lease *lease;
lease = lookup_lease_mac(m->chaddr, m->hlen);
if (!lease) {
return NULL;
}
lease->flags &= ~LEASE_FLAGS_ALLOCATED;
return lease;
}
/*---------------------------------------------------------------------------*/
static uint8_t *
add_msg_type(uint8_t *optptr, uint8_t type)
{
*optptr++ = DHCP_OPTION_MSG_TYPE;
*optptr++ = 1;
*optptr++ = type;
return optptr;
}
/*---------------------------------------------------------------------------*/
static uint8_t *
add_server_id(uint8_t *optptr)
{
*optptr++ = DHCP_OPTION_SERVER_ID;
*optptr++ = 4;
memcpy(optptr, &uip_hostaddr, 4);
return optptr + 4;
}
/*---------------------------------------------------------------------------*/
static uint8_t *
add_lease_time(uint8_t *optptr)
{
uint32_t lt;
*optptr++ = DHCP_OPTION_LEASE_TIME;
*optptr++ = 4;
lt = HTONL(config->default_lease_time);
memcpy(optptr, &lt, 4);
return optptr + 4;
}
/*---------------------------------------------------------------------------*/
static uint8_t *
add_end(uint8_t *optptr)
{
*optptr++ = DHCP_OPTION_END;
return optptr;
}
static uint8_t *
add_config(uint8_t *optptr)
{
if (config->flags & DHCP_CONF_NETMASK) {
*optptr++ = DHCP_OPTION_SUBNET_MASK;
*optptr++ = 4;
memcpy(optptr, &config->netmask, 4);
optptr += 4;
}
if (config->flags & DHCP_CONF_DNSADDR) {
*optptr++ = DHCP_OPTION_DNS_SERVER;
*optptr++ = 4;
memcpy(optptr, &config->dnsaddr, 4);
optptr += 4;
}
if (config->flags & DHCP_CONF_DEFAULT_ROUTER) {
*optptr++ = DHCP_OPTION_ROUTER;
*optptr++ = 4;
memcpy(optptr, &config->default_router, 4);
optptr += 4;
}
return optptr;
}
static void
create_msg(CC_REGISTER_ARG struct dhcp_msg *m)
{
m->op = DHCP_REPLY;
/* m->htype = DHCP_HTYPE_ETHERNET; */
/* m->hlen = DHCP_HLEN_ETHERNET; */
/* memcpy(m->chaddr, &uip_ethaddr,DHCP_HLEN_ETHERNET); */
m->hops = 0;
m->secs = 0;
memcpy(m->siaddr, &uip_hostaddr, 4);
m->sname[0] = '\0';
m->file[0] = '\0';
memcpy(m->options, magic_cookie, sizeof(magic_cookie));
}
static uip_ipaddr_t any_addr;
static uip_ipaddr_t bcast_addr;
/*---------------------------------------------------------------------------*/
static void
send_offer(struct uip_udp_conn *conn, struct dhcps_client_lease *lease)
{
u8_t *end;
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
create_msg(m);
memcpy(&m->yiaddr, &lease->ipaddr,4);
end = add_msg_type(&m->options[4], DHCPOFFER);
end = add_server_id(end);
end = add_lease_time(end);
end = add_config(end);
end = add_end(end);
uip_ipaddr_copy(&conn->ripaddr, &bcast_addr);
uip_send(uip_appdata, (int)(end - (u8_t *)uip_appdata));
}
static void
send_ack(struct uip_udp_conn *conn, struct dhcps_client_lease *lease)
{
u8_t *end;
uip_ipaddr_t ciaddr;
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
create_msg(m);
memcpy(&m->yiaddr, &lease->ipaddr,4);
end = add_msg_type(&m->options[4], DHCPACK);
end = add_server_id(end);
end = add_lease_time(end);
end = add_config(end);
end = add_end(end);
memcpy(&ciaddr, &lease->ipaddr,4);
uip_ipaddr_copy(&conn->ripaddr, &bcast_addr);
uip_send(uip_appdata, (int)(end - (u8_t *)uip_appdata));
printf("ACK\n");
}
static void
send_nack(struct uip_udp_conn *conn)
{
u8_t *end;
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
create_msg(m);
memset(&m->yiaddr, 0, 4);
end = add_msg_type(&m->options[4], DHCPNAK);
end = add_server_id(end);
end = add_end(end);
uip_ipaddr_copy(&conn->ripaddr, &bcast_addr);
uip_send(uip_appdata, (int)(end - (u8_t *)uip_appdata));
printf("NACK\n");
}
/*---------------------------------------------------------------------------*/
PROCESS(dhcp_server_process, "DHCP server");
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(dhcp_server_process, ev , data)
{
static struct uip_udp_conn *conn;
static struct uip_udp_conn *send_conn;
static struct dhcps_client_lease *lease;
PROCESS_BEGIN();
printf("DHCP server starting\n");
uip_ipaddr(&any_addr, 0,0,0,0);
uip_ipaddr(&bcast_addr, 255,255,255,255);
conn = udp_new(&any_addr, HTONS(DHCPS_CLIENT_PORT), NULL);
if (!conn) goto exit;
send_conn = udp_new(&bcast_addr, HTONS(DHCPS_CLIENT_PORT), NULL);
if (!send_conn) goto exit;
uip_udp_bind(conn, HTONS(DHCPS_SERVER_PORT));
uip_udp_bind(send_conn, HTONS(DHCPS_SERVER_PORT));
while(1) {
PROCESS_WAIT_EVENT();
if(ev == tcpip_event) {
if (uip_newdata()) {
struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
struct uip_udpip_hdr *header = (struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN];
if (m->op == DHCP_REQUEST && check_cookie() && m->hlen <= MAX_HLEN) {
uint8_t *opt = find_option(DHCP_OPTION_MSG_TYPE);
if (opt) {
uint8_t mtype = opt[2];
if (opt[2] == DHCPDISCOVER) {
printf("Discover\n");
lease = choose_address();
if (lease) {
lease->lease_end = clock_seconds()+config->default_lease_time;
tcpip_poll_udp(send_conn);
PROCESS_WAIT_EVENT_UNTIL(uip_poll());
send_offer(conn,lease);
}
} else {
uint8_t *opt = find_option(DHCP_OPTION_SERVER_ID);
if (!opt || uip_ipaddr_cmp((uip_ipaddr_t*)&opt[2], &uip_hostaddr)) {
if (mtype == DHCPREQUEST) {
printf("Request\n");
lease = allocate_address();
tcpip_poll_udp(send_conn);
PROCESS_WAIT_EVENT_UNTIL(uip_poll());
if (!lease) {
send_nack(send_conn);
} else {
send_ack(send_conn,lease);
}
} else if (mtype == DHCPRELEASE) {
printf("Release\n");
release_address();
} else if (mtype == DHCPDECLINE) {
printf("Decline\n");
} else if (mtype == DHCPINFORM) {
printf("Inform\n");
}
}
}
}
}
}
} else if (uip_poll()) {
}
}
exit:
printf("DHCP server exiting\n");
PROCESS_END();
}
void
dhcps_init(const struct dhcps_config *conf)
{
config = conf;
process_start(&dhcp_server_process,NULL);
}
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