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OVMS3-idf/components/lwip/apps/dhcpserver.c
XiaXiaotian 20064978ba Fix the bug that if one device is in station+softap mode, other device can not 
get IP address after connecting to the softap.

    Now the default netif is station in station+softap mode. The UDP pcb of
DHCP server is binded to IP 0.0.0.0. When other device connects to softap, the
DHCP offer will be sent by softap.But because the destination IP of DHCP offer
is broadcast IP and the source IP of it is 0.0.0.0, it will be sent from default
netif, that is station interface. Other device can not receive the DHCP offer
sent from station interface. As a result, other device can not get IP address.
The resolution is that bind UDP pcb to the IP address of softap. So, the source
IP of DHCP offer is that of softap. DHCP offer can be sent from softap interface
by source IP route method.
2017-09-23 20:18:50 +08:00

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//#include "esp_common.h"
#include <stdlib.h>
#include <string.h>
#include "lwip/inet.h"
#include "lwip/err.h"
#include "lwip/pbuf.h"
#include "lwip/udp.h"
#include "lwip/mem.h"
#include "lwip/ip_addr.h"
#include "tcpip_adapter.h"
#include "apps/dhcpserver.h"
#include "apps/dhcpserver_options.h"
#if ESP_DHCP
#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 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_INTERFACE_MTU 26
#define DHCP_OPTION_PERFORM_ROUTER_DISCOVERY 31
#define DHCP_OPTION_BROADCAST_ADDRESS 28
#define DHCP_OPTION_REQ_LIST 55
#define DHCP_OPTION_END 255
//#define USE_CLASS_B_NET 1
#define DHCPS_DEBUG 0
#define DHCPS_LOG printf
#define MAX_STATION_NUM 8
#define DHCPS_STATE_OFFER 1
#define DHCPS_STATE_DECLINE 2
#define DHCPS_STATE_ACK 3
#define DHCPS_STATE_NAK 4
#define DHCPS_STATE_IDLE 5
#define DHCPS_STATE_RELEASE 6
typedef struct _list_node {
void *pnode;
struct _list_node *pnext;
} list_node;
////////////////////////////////////////////////////////////////////////////////////
static const u32_t magic_cookie = 0x63538263;
static struct udp_pcb *pcb_dhcps = NULL;
static ip4_addr_t broadcast_dhcps;
static ip4_addr_t server_address;
static ip4_addr_t client_address; //added
static ip4_addr_t client_address_plus;
static list_node *plist = NULL;
static bool renew = false;
static dhcps_lease_t dhcps_poll;
static dhcps_offer_t dhcps_offer = 0xFF;
static dhcps_time_t dhcps_lease_time = DHCPS_LEASE_TIME_DEF; //minute
/******************************************************************************
* FunctionName : dhcps_option_info
* Description : get the DHCP message option info
* Parameters : op_id -- DHCP message option id
* opt_len -- DHCP message option length
* Returns : DHCP message option addr
*******************************************************************************/
void *dhcps_option_info(u8_t op_id, u32_t opt_len)
{
void *option_arg = NULL;
switch (op_id) {
case IP_ADDRESS_LEASE_TIME:
if (opt_len == sizeof(dhcps_time_t)) {
option_arg = &dhcps_lease_time;
}
break;
case REQUESTED_IP_ADDRESS:
if (opt_len == sizeof(dhcps_lease_t)) {
option_arg = &dhcps_poll;
}
break;
case ROUTER_SOLICITATION_ADDRESS:
if (opt_len == sizeof(dhcps_offer_t)) {
option_arg = &dhcps_offer;
}
break;
default:
break;
}
return option_arg;
}
/******************************************************************************
* FunctionName : node_insert_to_list
* Description : insert the node to the list
* Parameters : phead -- the head node of the list
* pinsert -- the insert node of the list
* Returns : none
*******************************************************************************/
static void node_insert_to_list(list_node **phead, list_node *pinsert)
{
list_node *plist = NULL;
struct dhcps_pool *pdhcps_pool = NULL;
struct dhcps_pool *pdhcps_node = NULL;
if (*phead == NULL) {
*phead = pinsert;
} else {
plist = *phead;
pdhcps_node = pinsert->pnode;
pdhcps_pool = plist->pnode;
if (pdhcps_node->ip.addr < pdhcps_pool->ip.addr) {
pinsert->pnext = plist;
*phead = pinsert;
} else {
while (plist->pnext != NULL) {
pdhcps_pool = plist->pnext->pnode;
if (pdhcps_node->ip.addr < pdhcps_pool->ip.addr) {
pinsert->pnext = plist->pnext;
plist->pnext = pinsert;
break;
}
plist = plist->pnext;
}
if (plist->pnext == NULL) {
plist->pnext = pinsert;
}
}
}
// pinsert->pnext = NULL;
}
/******************************************************************************
* FunctionName : node_delete_from_list
* Description : remove the node from list
* Parameters : phead -- the head node of the list
* pdelete -- the remove node of the list
* Returns : none
*******************************************************************************/
void node_remove_from_list(list_node **phead, list_node *pdelete)
{
list_node *plist = NULL;
plist = *phead;
if (plist == NULL) {
*phead = NULL;
} else {
if (plist == pdelete) {
*phead = plist->pnext;
pdelete->pnext = NULL;
} else {
while (plist != NULL) {
if (plist->pnext == pdelete) {
plist->pnext = pdelete->pnext;
pdelete->pnext = NULL;
}
plist = plist->pnext;
}
}
}
}
/******************************************************************************
* FunctionName : add_msg_type
* Description : add TYPE option of DHCP message
* Parameters : optptr -- the addr of DHCP message option
* Returns : the addr of DHCP message option
*******************************************************************************/
static u8_t *add_msg_type(u8_t *optptr, u8_t type)
{
*optptr++ = DHCP_OPTION_MSG_TYPE;
*optptr++ = 1;
*optptr++ = type;
return optptr;
}
/******************************************************************************
* FunctionName : add_offer_options
* Description : add OFFER option of DHCP message
* Parameters : optptr -- the addr of DHCP message option
* Returns : the addr of DHCP message option
*******************************************************************************/
static u8_t *add_offer_options(u8_t *optptr)
{
ip4_addr_t ipadd;
ipadd.addr = *((u32_t *) &server_address);
#ifdef USE_CLASS_B_NET
*optptr++ = DHCP_OPTION_SUBNET_MASK;
*optptr++ = 4; //length
*optptr++ = 255;
*optptr++ = 240;
*optptr++ = 0;
*optptr++ = 0;
#else
*optptr++ = DHCP_OPTION_SUBNET_MASK;
*optptr++ = 4;
*optptr++ = 255;
*optptr++ = 255;
*optptr++ = 255;
*optptr++ = 0;
#endif
*optptr++ = DHCP_OPTION_LEASE_TIME;
*optptr++ = 4;
*optptr++ = ((dhcps_lease_time * 60) >> 24) & 0xFF;
*optptr++ = ((dhcps_lease_time * 60) >> 16) & 0xFF;
*optptr++ = ((dhcps_lease_time * 60) >> 8) & 0xFF;
*optptr++ = ((dhcps_lease_time * 60) >> 0) & 0xFF;
*optptr++ = DHCP_OPTION_SERVER_ID;
*optptr++ = 4;
*optptr++ = ip4_addr1(&ipadd);
*optptr++ = ip4_addr2(&ipadd);
*optptr++ = ip4_addr3(&ipadd);
*optptr++ = ip4_addr4(&ipadd);
if (dhcps_router_enabled(dhcps_offer)) {
tcpip_adapter_ip_info_t if_ip;
//bzero(&if_ip, sizeof(struct ip_info));
memset(&if_ip , 0x00, sizeof(tcpip_adapter_ip_info_t));
tcpip_adapter_get_ip_info(ESP_IF_WIFI_AP, &if_ip);
if (!ip4_addr_isany_val(if_ip.gw)) {
*optptr++ = DHCP_OPTION_ROUTER;
*optptr++ = 4;
*optptr++ = ip4_addr1(&if_ip.gw);
*optptr++ = ip4_addr2(&if_ip.gw);
*optptr++ = ip4_addr3(&if_ip.gw);
*optptr++ = ip4_addr4(&if_ip.gw);
}
}
#ifdef USE_DNS
*optptr++ = DHCP_OPTION_DNS_SERVER;
*optptr++ = 4;
*optptr++ = ip4_addr1(&ipadd);
*optptr++ = ip4_addr2(&ipadd);
*optptr++ = ip4_addr3(&ipadd);
*optptr++ = ip4_addr4(&ipadd);
#endif
#ifdef CLASS_B_NET
*optptr++ = DHCP_OPTION_BROADCAST_ADDRESS;
*optptr++ = 4;
*optptr++ = ip4_addr1(&ipadd);
*optptr++ = 255;
*optptr++ = 255;
*optptr++ = 255;
#else
*optptr++ = DHCP_OPTION_BROADCAST_ADDRESS;
*optptr++ = 4;
*optptr++ = ip4_addr1(&ipadd);
*optptr++ = ip4_addr2(&ipadd);
*optptr++ = ip4_addr3(&ipadd);
*optptr++ = 255;
#endif
*optptr++ = DHCP_OPTION_INTERFACE_MTU;
*optptr++ = 2;
#ifdef CLASS_B_NET
*optptr++ = 0x05;
*optptr++ = 0xdc;
#else
*optptr++ = 0x02;
*optptr++ = 0x40;
#endif
*optptr++ = DHCP_OPTION_PERFORM_ROUTER_DISCOVERY;
*optptr++ = 1;
*optptr++ = 0x00;
*optptr++ = 43;
*optptr++ = 6;
*optptr++ = 0x01;
*optptr++ = 4;
*optptr++ = 0x00;
*optptr++ = 0x00;
*optptr++ = 0x00;
*optptr++ = 0x02;
return optptr;
}
/******************************************************************************
* FunctionName : add_end
* Description : add end option of DHCP message
* Parameters : optptr -- the addr of DHCP message option
* Returns : the addr of DHCP message option
*******************************************************************************/
static u8_t *add_end(u8_t *optptr)
{
*optptr++ = DHCP_OPTION_END;
return optptr;
}
/******************************************************************************
* FunctionName : create_msg
* Description : create response message
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void create_msg(struct dhcps_msg *m)
{
ip4_addr_t client;
client.addr = *((uint32_t *) &client_address);
m->op = DHCP_REPLY;
m->htype = DHCP_HTYPE_ETHERNET;
m->hlen = 6;
m->hops = 0;
// os_memcpy((char *) xid, (char *) m->xid, sizeof(m->xid));
m->secs = 0;
m->flags = htons(BOOTP_BROADCAST);
memcpy((char *) m->yiaddr, (char *) &client.addr, sizeof(m->yiaddr));
memset((char *) m->ciaddr, 0, sizeof(m->ciaddr));
memset((char *) m->siaddr, 0, sizeof(m->siaddr));
memset((char *) m->giaddr, 0, sizeof(m->giaddr));
memset((char *) m->sname, 0, sizeof(m->sname));
memset((char *) m->file, 0, sizeof(m->file));
memset((char *) m->options, 0, sizeof(m->options));
u32_t magic_cookie_temp = magic_cookie;
memcpy((char *) m->options, &magic_cookie_temp, sizeof(magic_cookie_temp));
}
struct pbuf * dhcps_pbuf_alloc(u16_t len)
{
u16_t mlen = sizeof(struct dhcps_msg);
if (len > mlen) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: len=%d mlen=%d", len, mlen);
#endif
mlen = len;
}
return pbuf_alloc(PBUF_TRANSPORT, mlen, PBUF_RAM);
}
/******************************************************************************
* FunctionName : send_offer
* Description : DHCP message OFFER Response
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void send_offer(struct dhcps_msg *m, u16_t len)
{
u8_t *end;
struct pbuf *p, *q;
u8_t *data;
u16_t cnt = 0;
u16_t i;
err_t SendOffer_err_t;
create_msg(m);
end = add_msg_type(&m->options[4], DHCPOFFER);
end = add_offer_options(end);
end = add_end(end);
p = dhcps_pbuf_alloc(len);
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_offer>>p->ref = %d\n", p->ref);
#endif
if (p != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_offer>>pbuf_alloc succeed\n");
DHCPS_LOG("dhcps: send_offer>>p->tot_len = %d\n", p->tot_len);
DHCPS_LOG("dhcps: send_offer>>p->len = %d\n", p->len);
#endif
q = p;
while (q != NULL) {
data = (u8_t *)q->payload;
for (i = 0; i < q->len; i++) {
data[i] = ((u8_t *) m)[cnt++];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
q = q->next;
}
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_offer>>pbuf_alloc failed\n");
#endif
return;
}
ip_addr_t ip_temp = IPADDR4_INIT(0x0);
ip4_addr_set(ip_2_ip4(&ip_temp), &broadcast_dhcps);
SendOffer_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_offer>>udp_sendto result %x\n", SendOffer_err_t);
#endif
if (p->ref != 0) {
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_offer>>free pbuf\n");
#endif
pbuf_free(p);
}
}
/******************************************************************************
* FunctionName : send_nak
* Description : DHCP message NACK Response
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void send_nak(struct dhcps_msg *m, u16_t len)
{
u8_t *end;
struct pbuf *p, *q;
u8_t *data;
u16_t cnt = 0;
u16_t i;
err_t SendNak_err_t;
create_msg(m);
end = add_msg_type(&m->options[4], DHCPNAK);
end = add_end(end);
p = dhcps_pbuf_alloc(len);
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_nak>>p->ref = %d\n", p->ref);
#endif
if (p != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_nak>>pbuf_alloc succeed\n");
DHCPS_LOG("dhcps: send_nak>>p->tot_len = %d\n", p->tot_len);
DHCPS_LOG("dhcps: send_nak>>p->len = %d\n", p->len);
#endif
q = p;
while (q != NULL) {
data = (u8_t *)q->payload;
for (i = 0; i < q->len; i++) {
data[i] = ((u8_t *) m)[cnt++];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
q = q->next;
}
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_nak>>pbuf_alloc failed\n");
#endif
return;
}
ip_addr_t ip_temp = IPADDR4_INIT(0x0);
ip4_addr_set(ip_2_ip4(&ip_temp), &broadcast_dhcps);
SendNak_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_nak>>udp_sendto result %x\n", SendNak_err_t);
#endif
if (p->ref != 0) {
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_nak>>free pbuf\n");
#endif
pbuf_free(p);
}
}
/******************************************************************************
* FunctionName : send_ack
* Description : DHCP message ACK Response
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void send_ack(struct dhcps_msg *m, u16_t len)
{
u8_t *end;
struct pbuf *p, *q;
u8_t *data;
u16_t cnt = 0;
u16_t i;
err_t SendAck_err_t;
create_msg(m);
end = add_msg_type(&m->options[4], DHCPACK);
end = add_offer_options(end);
end = add_end(end);
p = dhcps_pbuf_alloc(len);
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_ack>>p->ref = %d\n", p->ref);
#endif
if (p != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_ack>>pbuf_alloc succeed\n");
DHCPS_LOG("dhcps: send_ack>>p->tot_len = %d\n", p->tot_len);
DHCPS_LOG("dhcps: send_ack>>p->len = %d\n", p->len);
#endif
q = p;
while (q != NULL) {
data = (u8_t *)q->payload;
for (i = 0; i < q->len; i++) {
data[i] = ((u8_t *) m)[cnt++];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
q = q->next;
}
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_ack>>pbuf_alloc failed\n");
#endif
return;
}
ip_addr_t ip_temp = IPADDR4_INIT(0x0);
ip4_addr_set(ip_2_ip4(&ip_temp), &broadcast_dhcps);
SendAck_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_ack>>udp_sendto result %x\n", SendAck_err_t);
#endif
if (p->ref != 0) {
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_ack>>free pbuf\n");
#endif
pbuf_free(p);
}
}
/******************************************************************************
* FunctionName : parse_options
* Description : parse DHCP message options
* Parameters : optptr -- DHCP message option info
* len -- DHCP message option length
* Returns : none
*******************************************************************************/
static u8_t parse_options(u8_t *optptr, s16_t len)
{
ip4_addr_t client;
bool is_dhcp_parse_end = false;
struct dhcps_state s;
client.addr = *((uint32_t *) &client_address);
u8_t *end = optptr + len;
u16_t type = 0;
s.state = DHCPS_STATE_IDLE;
while (optptr < end) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: (s16_t)*optptr = %d\n", (s16_t)*optptr);
#endif
switch ((s16_t) *optptr) {
case DHCP_OPTION_MSG_TYPE: //53
type = *(optptr + 2);
break;
case DHCP_OPTION_REQ_IPADDR://50
if (memcmp((char *) &client.addr, (char *) optptr + 2, 4) == 0) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCP_OPTION_REQ_IPADDR = 0 ok\n");
#endif
s.state = DHCPS_STATE_ACK;
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCP_OPTION_REQ_IPADDR != 0 err\n");
#endif
s.state = DHCPS_STATE_NAK;
}
break;
case DHCP_OPTION_END: {
is_dhcp_parse_end = true;
}
break;
}
if (is_dhcp_parse_end) {
break;
}
optptr += optptr[1] + 2;
}
switch (type) {
case DHCPDISCOVER://1
s.state = DHCPS_STATE_OFFER;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_OFFER\n");
#endif
break;
case DHCPREQUEST://3
if (!(s.state == DHCPS_STATE_ACK || s.state == DHCPS_STATE_NAK)) {
if (renew == true) {
s.state = DHCPS_STATE_ACK;
} else {
s.state = DHCPS_STATE_NAK;
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_NAK\n");
#endif
}
break;
case DHCPDECLINE://4
s.state = DHCPS_STATE_IDLE;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_IDLE\n");
#endif
break;
case DHCPRELEASE://7
s.state = DHCPS_STATE_RELEASE;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_IDLE\n");
#endif
break;
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: return s.state = %d\n", s.state);
#endif
return s.state;
}
/******************************************************************************
* FunctionName : parse_msg
* Description : parse DHCP message from netif
* Parameters : m -- DHCP message info
* len -- DHCP message length
* Returns : DHCP message type
*******************************************************************************/
static s16_t parse_msg(struct dhcps_msg *m, u16_t len)
{
u32_t lease_timer = (dhcps_lease_time * 60)/DHCPS_COARSE_TIMER_SECS;
if (memcmp((char *)m->options, &magic_cookie, sizeof(magic_cookie)) == 0) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: len = %d\n", len);
#endif
ip4_addr_t addr_tmp;
struct dhcps_pool *pdhcps_pool = NULL;
list_node *pnode = NULL;
list_node *pback_node = NULL;
ip4_addr_t first_address;
bool flag = false;
first_address.addr = dhcps_poll.start_ip.addr;
client_address.addr = client_address_plus.addr;
renew = false;
if (plist != NULL) {
for (pback_node = plist; pback_node != NULL; pback_node = pback_node->pnext) {
pdhcps_pool = pback_node->pnode;
if (memcmp(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac)) == 0) {
if (memcmp(&pdhcps_pool->ip.addr, m->ciaddr, sizeof(pdhcps_pool->ip.addr)) == 0) {
renew = true;
}
client_address.addr = pdhcps_pool->ip.addr;
pdhcps_pool->lease_timer = lease_timer;
pnode = pback_node;
goto POOL_CHECK;
} else if (pdhcps_pool->ip.addr == client_address_plus.addr) {
addr_tmp.addr = htonl(client_address_plus.addr);
addr_tmp.addr++;
client_address_plus.addr = htonl(addr_tmp.addr);
client_address.addr = client_address_plus.addr;
}
if (flag == false) { // search the fisrt unused ip
if (first_address.addr < pdhcps_pool->ip.addr) {
flag = true;
} else {
addr_tmp.addr = htonl(first_address.addr);
addr_tmp.addr++;
first_address.addr = htonl(addr_tmp.addr);
}
}
}
} else {
client_address.addr = dhcps_poll.start_ip.addr;
}
if (client_address_plus.addr > dhcps_poll.end_ip.addr) {
client_address.addr = first_address.addr;
}
if (client_address.addr > dhcps_poll.end_ip.addr) {
client_address_plus.addr = dhcps_poll.start_ip.addr;
pdhcps_pool = NULL;
pnode = NULL;
} else {
pdhcps_pool = (struct dhcps_pool *)malloc(sizeof(struct dhcps_pool));
memset(pdhcps_pool , 0x00 , sizeof(struct dhcps_pool));
pdhcps_pool->ip.addr = client_address.addr;
memcpy(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac));
pdhcps_pool->lease_timer = lease_timer;
pnode = (list_node *)malloc(sizeof(list_node));
memset(pnode , 0x00 , sizeof(list_node));
pnode->pnode = pdhcps_pool;
pnode->pnext = NULL;
node_insert_to_list(&plist, pnode);
if (client_address.addr == dhcps_poll.end_ip.addr) {
client_address_plus.addr = dhcps_poll.start_ip.addr;
} else {
addr_tmp.addr = htonl(client_address.addr);
addr_tmp.addr++;
client_address_plus.addr = htonl(addr_tmp.addr);
}
}
POOL_CHECK:
if ((client_address.addr > dhcps_poll.end_ip.addr) || (ip4_addr_isany(&client_address))) {
if (pnode != NULL) {
node_remove_from_list(&plist, pnode);
free(pnode);
pnode = NULL;
}
if (pdhcps_pool != NULL) {
free(pdhcps_pool);
pdhcps_pool = NULL;
}
return 4;
}
s16_t ret = parse_options(&m->options[4], len);;
if (ret == DHCPS_STATE_RELEASE) {
if (pnode != NULL) {
node_remove_from_list(&plist, pnode);
free(pnode);
pnode = NULL;
}
if (pdhcps_pool != NULL) {
free(pdhcps_pool);
pdhcps_pool = NULL;
}
memset(&client_address, 0x0, sizeof(client_address));
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: xid changed\n");
DHCPS_LOG("dhcps: client_address.addr = %x\n", client_address.addr);
#endif
return ret;
}
return 0;
}
/******************************************************************************
* FunctionName : handle_dhcp
* Description : If an incoming DHCP message is in response to us, then trigger the state machine
* Parameters : arg -- arg user supplied argument (udp_pcb.recv_arg)
* pcb -- the udp_pcb which received data
* p -- the packet buffer that was received
* addr -- the remote IP address from which the packet was received
* port -- the remote port from which the packet was received
* Returns : none
*******************************************************************************/
static void handle_dhcp(void *arg,
struct udp_pcb *pcb,
struct pbuf *p,
const ip_addr_t *addr,
u16_t port)
{
struct dhcps_msg *pmsg_dhcps = NULL;
s16_t tlen, malloc_len;
u16_t i;
u16_t dhcps_msg_cnt = 0;
u8_t *p_dhcps_msg = NULL;
u8_t *data;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> receive a packet\n");
#endif
if (p == NULL) {
return;
}
malloc_len = sizeof(struct dhcps_msg);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp malloc_len=%d rx_len=%d", malloc_len, p->tot_len);
#endif
if (malloc_len < p->tot_len) {
malloc_len = p->tot_len;
}
pmsg_dhcps = (struct dhcps_msg *)malloc(malloc_len);
if (NULL == pmsg_dhcps) {
pbuf_free(p);
return;
}
memset(pmsg_dhcps , 0x00 , malloc_len);
p_dhcps_msg = (u8_t *)pmsg_dhcps;
tlen = p->tot_len;
data = p->payload;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> p->tot_len = %d\n", tlen);
DHCPS_LOG("dhcps: handle_dhcp-> p->len = %d\n", p->len);
#endif
for (i = 0; i < p->len; i++) {
p_dhcps_msg[dhcps_msg_cnt++] = data[i];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
if (p->next != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> p->next != NULL\n");
DHCPS_LOG("dhcps: handle_dhcp-> p->next->tot_len = %d\n", p->next->tot_len);
DHCPS_LOG("dhcps: handle_dhcp-> p->next->len = %d\n", p->next->len);
#endif
data = p->next->payload;
for (i = 0; i < p->next->len; i++) {
p_dhcps_msg[dhcps_msg_cnt++] = data[i];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> parse_msg(p)\n");
#endif
switch (parse_msg(pmsg_dhcps, tlen - 240)) {
case DHCPS_STATE_OFFER://1
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_OFFER\n");
#endif
send_offer(pmsg_dhcps, malloc_len);
break;
case DHCPS_STATE_ACK://3
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_ACK\n");
#endif
send_ack(pmsg_dhcps, malloc_len);
break;
case DHCPS_STATE_NAK://4
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_NAK\n");
#endif
send_nak(pmsg_dhcps, malloc_len);
break;
default :
break;
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> pbuf_free(p)\n");
#endif
pbuf_free(p);
free(pmsg_dhcps);
pmsg_dhcps = NULL;
}
/******************************************************************************
* FunctionName : dhcps_poll_set
* Description : set ip poll from start to end for station
* Parameters : ip -- The current ip addr
* Returns : none
*******************************************************************************/
static void dhcps_poll_set(u32_t ip)
{
u32_t softap_ip = 0, local_ip = 0;
u32_t start_ip = 0;
u32_t end_ip = 0;
if (dhcps_poll.enable == true) {
softap_ip = htonl(ip);
start_ip = htonl(dhcps_poll.start_ip.addr);
end_ip = htonl(dhcps_poll.end_ip.addr);
/*config ip information can't contain local ip*/
if ((start_ip <= softap_ip) && (softap_ip <= end_ip)) {
dhcps_poll.enable = false;
} else {
/*config ip information must be in the same segment as the local ip*/
softap_ip >>= 8;
if (((start_ip >> 8 != softap_ip) || (end_ip >> 8 != softap_ip))
|| (end_ip - start_ip > DHCPS_MAX_LEASE)) {
dhcps_poll.enable = false;
}
}
}
if (dhcps_poll.enable == false) {
local_ip = softap_ip = htonl(ip);
softap_ip &= 0xFFFFFF00;
local_ip &= 0xFF;
if (local_ip >= 0x80) {
local_ip -= DHCPS_MAX_LEASE;
} else {
local_ip ++;
}
bzero(&dhcps_poll, sizeof(dhcps_poll));
dhcps_poll.start_ip.addr = softap_ip | local_ip;
dhcps_poll.end_ip.addr = softap_ip | (local_ip + DHCPS_MAX_LEASE - 1);
dhcps_poll.start_ip.addr = htonl(dhcps_poll.start_ip.addr);
dhcps_poll.end_ip.addr = htonl(dhcps_poll.end_ip.addr);
}
}
/******************************************************************************
* FunctionName : dhcps_start
* Description : start dhcp server function
* Parameters : netif -- The current netif addr
* : info -- The current ip info
* Returns : none
*******************************************************************************/
void dhcps_start(struct netif *netif, ip4_addr_t ip)
{
struct netif *apnetif = netif;
if (apnetif->dhcps_pcb != NULL) {
udp_remove(apnetif->dhcps_pcb);
}
pcb_dhcps = udp_new();
if (pcb_dhcps == NULL || ip4_addr_isany_val(ip)) {
printf("dhcps_start(): could not obtain pcb\n");
}
apnetif->dhcps_pcb = pcb_dhcps;
IP4_ADDR(&broadcast_dhcps, 255, 255, 255, 255);
server_address.addr = ip.addr;
dhcps_poll_set(server_address.addr);
client_address_plus.addr = dhcps_poll.start_ip.addr;
udp_bind(pcb_dhcps, &netif->ip_addr, DHCPS_SERVER_PORT);
udp_recv(pcb_dhcps, handle_dhcp, NULL);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps:dhcps_start->udp_recv function Set a receive callback handle_dhcp for UDP_PCB pcb_dhcps\n");
#endif
}
/******************************************************************************
* FunctionName : dhcps_stop
* Description : stop dhcp server function
* Parameters : netif -- The current netif addr
* Returns : none
*******************************************************************************/
void dhcps_stop(struct netif *netif)
{
struct netif *apnetif = netif;
if (apnetif == NULL) {
printf("dhcps_stop: apnetif == NULL\n");
return;
}
if (apnetif->dhcps_pcb != NULL) {
udp_disconnect(apnetif->dhcps_pcb);
udp_remove(apnetif->dhcps_pcb);
apnetif->dhcps_pcb = NULL;
}
list_node *pnode = NULL;
list_node *pback_node = NULL;
pnode = plist;
while (pnode != NULL) {
pback_node = pnode;
pnode = pback_node->pnext;
node_remove_from_list(&plist, pback_node);
free(pback_node->pnode);
pback_node->pnode = NULL;
free(pback_node);
pback_node = NULL;
}
}
/******************************************************************************
* FunctionName : kill_oldest_dhcps_pool
* Description : remove the oldest node from list
* Parameters : none
* Returns : none
*******************************************************************************/
static void kill_oldest_dhcps_pool(void)
{
list_node *pre = NULL, *p = NULL;
list_node *minpre = NULL, *minp = NULL;
struct dhcps_pool *pdhcps_pool = NULL, *pmin_pool = NULL;
pre = plist;
p = pre->pnext;
minpre = pre;
minp = p;
while (p != NULL) {
pdhcps_pool = p->pnode;
pmin_pool = minp->pnode;
if (pdhcps_pool->lease_timer < pmin_pool->lease_timer) {
minp = p;
minpre = pre;
}
pre = p;
p = p->pnext;
}
minpre->pnext = minp->pnext;
free(minp->pnode);
minp->pnode = NULL;
free(minp);
minp = NULL;
}
/******************************************************************************
* FunctionName : dhcps_coarse_tmr
* Description : the lease time count
* Parameters : none
* Returns : none
*******************************************************************************/
void dhcps_coarse_tmr(void)
{
u8_t num_dhcps_pool = 0;
list_node *pback_node = NULL;
list_node *pnode = NULL;
struct dhcps_pool *pdhcps_pool = NULL;
pnode = plist;
while (pnode != NULL) {
pdhcps_pool = pnode->pnode;
pdhcps_pool->lease_timer --;
if (pdhcps_pool->lease_timer == 0) {
pback_node = pnode;
pnode = pback_node->pnext;
node_remove_from_list(&plist, pback_node);
free(pback_node->pnode);
pback_node->pnode = NULL;
free(pback_node);
pback_node = NULL;
} else {
pnode = pnode ->pnext;
num_dhcps_pool ++;
}
}
if (num_dhcps_pool >= MAX_STATION_NUM) {
kill_oldest_dhcps_pool();
}
}
/******************************************************************************
* FunctionName : dhcp_search_ip_on_mac
* Description : Search ip address based on mac address
* Parameters : mac -- The MAC addr
* ip -- The IP info
* Returns : true or false
*******************************************************************************/
bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip)
{
struct dhcps_pool *pdhcps_pool = NULL;
list_node *pback_node = NULL;
bool ret = false;
for (pback_node = plist; pback_node != NULL; pback_node = pback_node->pnext) {
pdhcps_pool = pback_node->pnode;
if (memcmp(pdhcps_pool->mac, mac, sizeof(pdhcps_pool->mac)) == 0) {
memcpy(&ip->addr, &pdhcps_pool->ip.addr, sizeof(pdhcps_pool->ip.addr));
ret = true;
break;
}
}
return ret;
}
#endif
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