dhcpserver.c

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#include "lwip/inet.h"
#include "lwip/err.h"
#include "lwip/pbuf.h"
#include "lwip/udp.h"
#include "lwip/mem.h"
//#include "crypto/common.h"
#include "osapi.h"
#include "lwip/app/dhcpserver.h"

#ifndef LWIP_OPEN_SRC
#include "net80211/ieee80211_var.h"
#endif

#include "user_interface.h"

#ifdef MEMLEAK_DEBUG
static const char mem_debug_file[] ICACHE_RODATA_ATTR = __FILE__;
#endif

////////////////////////////////////////////////////////////////////////////////////
//static const uint8_t xid[4] = {0xad, 0xde, 0x12, 0x23};
//static u8_t old_xid[4] = {0};
static const uint32 magic_cookie ICACHE_RODATA_ATTR = 0x63538263;
static struct udp_pcb *pcb_dhcps = NULL;
static struct ip_addr broadcast_dhcps;
static struct ip_addr server_address;
static struct ip_addr client_address;//added
static struct ip_addr client_address_plus;

static struct ip_addr dns_address = {0};

static struct dhcps_lease dhcps_lease;
//static bool dhcps_lease_flag = true;
static list_node *plist = NULL;
static uint8 offer = 0xFF;
static bool renew = false;
#define DHCPS_LEASE_TIME_DEF    (120)
uint32 dhcps_lease_time = DHCPS_LEASE_TIME_DEF;  //minute
/******************************************************************************
 * FunctionName : node_insert_to_list
 * Description  : insert the node to the list
 * Parameters   : arg -- Additional argument to pass to the callback function
 * Returns      : none
*******************************************************************************/
void ICACHE_FLASH_ATTR 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   : arg -- Additional argument to pass to the callback function
 * Returns      : none
*******************************************************************************/
void ICACHE_FLASH_ATTR 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;
        } else {
            while (plist != NULL) {
                if (plist->pnext == pdelete){
                    plist->pnext = pdelete->pnext;
                }
                plist = plist->pnext;
            }
        }
    }
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * ��DHCP msg��Ϣ�ṹ����������
 *
 * @param optptr -- DHCP msg��Ϣλ��
 * @param type -- Ҫ��ӵ�����option
 *
 * @return uint8_t* ����DHCP msgƫ�Ƶ�ַ
 */
///////////////////////////////////////////////////////////////////////////////////
static uint8_t* ICACHE_FLASH_ATTR add_msg_type(uint8_t *optptr, uint8_t type)
{

        *optptr++ = DHCP_OPTION_MSG_TYPE;
        *optptr++ = 1;
        *optptr++ = type;
        return optptr;
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * ��DHCP msg�ṹ������offerӦ������
 *
 * @param optptr -- DHCP msg��Ϣλ��
 *
 * @return uint8_t* ����DHCP msgƫ�Ƶ�ַ
 */
///////////////////////////////////////////////////////////////////////////////////
static uint8_t* ICACHE_FLASH_ATTR add_offer_options(uint8_t *optptr)
{
        struct ip_addr ipadd;

        ipadd.addr = *( (uint32_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_TIMER * 60) >> 24) & 0xFF;
        *optptr++ = ((DHCPS_LEASE_TIMER * 60) >> 16) & 0xFF;
        *optptr++ = ((DHCPS_LEASE_TIMER * 60) >> 8) & 0xFF;
        *optptr++ = ((DHCPS_LEASE_TIMER * 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(offer)){
            struct ip_info if_ip;
            os_bzero(&if_ip, sizeof(struct ip_info));
            wifi_get_ip_info(SOFTAP_IF, &if_ip);

            *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( &dns_address);
        *optptr++ = ip4_addr2( &dns_address);
        *optptr++ = ip4_addr3( &dns_address);
        *optptr++ = ip4_addr4( &dns_address);
#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;
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * ��DHCP msg�ṹ����ӽ����־����
 *
 * @param optptr -- DHCP msg��Ϣλ��
 *
 * @return uint8_t* ����DHCP msgƫ�Ƶ�ַ
 */
///////////////////////////////////////////////////////////////////////////////////
static uint8_t* ICACHE_FLASH_ATTR add_end(uint8_t *optptr)
{

        *optptr++ = DHCP_OPTION_END;
        return optptr;
}
///////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////
static void ICACHE_FLASH_ATTR create_msg(struct dhcps_msg *m)
{
        struct ip_addr 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); 

        os_memcpy((char *) m->yiaddr, (char *) &client.addr, sizeof(m->yiaddr));

        os_memset((char *) m->ciaddr, 0, sizeof(m->ciaddr));
        os_memset((char *) m->siaddr, 0, sizeof(m->siaddr));
        os_memset((char *) m->giaddr, 0, sizeof(m->giaddr));
        os_memset((char *) m->sname, 0, sizeof(m->sname));
        os_memset((char *) m->file, 0, sizeof(m->file));

        os_memset((char *) m->options, 0, sizeof(m->options));
        os_memcpy((char *) m->options, &magic_cookie, sizeof(magic_cookie));
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * ����һ��OFFER
 *
 * @param -- m ָ����Ҫ���͵�DHCP msg����
 */
///////////////////////////////////////////////////////////////////////////////////
static void ICACHE_FLASH_ATTR send_offer(struct dhcps_msg *m)
{
        uint8_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 = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg), PBUF_RAM);
#if DHCPS_DEBUG
        os_printf("udhcp: send_offer>>p->ref = %d\n", p->ref);
#endif
        if(p != NULL){
           
#if DHCPS_DEBUG
            os_printf("dhcps: send_offer>>pbuf_alloc succeed\n");
            os_printf("dhcps: send_offer>>p->tot_len = %d\n", p->tot_len);
            os_printf("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
                    os_printf("%02x ",data[i]);
                    if((i+1)%16 == 0){
                        os_printf("\n");
                    }
#endif
                }

                q = q->next;
            }
        }else{
            
#if DHCPS_DEBUG
            os_printf("dhcps: send_offer>>pbuf_alloc failed\n");
#endif
            return;
        }
        SendOffer_err_t = udp_sendto( pcb_dhcps, p, &broadcast_dhcps, DHCPS_CLIENT_PORT );
#if DHCPS_DEBUG
            os_printf("dhcps: send_offer>>udp_sendto result %x\n",SendOffer_err_t);
#endif
        if(p->ref != 0){    
#if DHCPS_DEBUG
            os_printf("udhcp: send_offer>>free pbuf\n");
#endif
            pbuf_free(p);
        }
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * ����һ��NAK��Ϣ
 *
 * @param m ָ����Ҫ���͵�DHCP msg����
 */
///////////////////////////////////////////////////////////////////////////////////
static void ICACHE_FLASH_ATTR send_nak(struct dhcps_msg *m)
{

        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 = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg), PBUF_RAM);
#if DHCPS_DEBUG
        os_printf("udhcp: send_nak>>p->ref = %d\n", p->ref);
#endif
        if(p != NULL){
            
#if DHCPS_DEBUG
            os_printf("dhcps: send_nak>>pbuf_alloc succeed\n");
            os_printf("dhcps: send_nak>>p->tot_len = %d\n", p->tot_len);
            os_printf("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                 
                    os_printf("%02x ",data[i]);
                    if((i+1)%16 == 0){
                        os_printf("\n");
                    }
#endif
                }

                q = q->next;
            }
        }else{
            
#if DHCPS_DEBUG
            os_printf("dhcps: send_nak>>pbuf_alloc failed\n");
#endif
            return;
        }
        SendNak_err_t = udp_sendto( pcb_dhcps, p, &broadcast_dhcps, DHCPS_CLIENT_PORT );
#if DHCPS_DEBUG
            os_printf("dhcps: send_nak>>udp_sendto result %x\n",SendNak_err_t);
#endif
        if(p->ref != 0){
#if DHCPS_DEBUG         
            os_printf("udhcp: send_nak>>free pbuf\n");
#endif
            pbuf_free(p);
        }
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * ����һ��ACK��DHCP�ͻ���
 *
 * @param m ָ����Ҫ���͵�DHCP msg����
 */
///////////////////////////////////////////////////////////////////////////////////
static void ICACHE_FLASH_ATTR send_ack(struct dhcps_msg *m)
{

        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 = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg), PBUF_RAM);
#if DHCPS_DEBUG
        os_printf("udhcp: send_ack>>p->ref = %d\n", p->ref);
#endif
        if(p != NULL){
            
#if DHCPS_DEBUG
            os_printf("dhcps: send_ack>>pbuf_alloc succeed\n");
            os_printf("dhcps: send_ack>>p->tot_len = %d\n", p->tot_len);
            os_printf("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                 
                    os_printf("%02x ",data[i]);
                    if((i+1)%16 == 0){
                        os_printf("\n");
                    }
#endif
                }

                q = q->next;
            }
        }else{
        
#if DHCPS_DEBUG
            os_printf("dhcps: send_ack>>pbuf_alloc failed\n");
#endif
            return;
        }
        SendAck_err_t = udp_sendto( pcb_dhcps, p, &broadcast_dhcps, DHCPS_CLIENT_PORT );
#if DHCPS_DEBUG
            os_printf("dhcps: send_ack>>udp_sendto result %x\n",SendAck_err_t);
#endif
        
        if(p->ref != 0){
#if DHCPS_DEBUG
            os_printf("udhcp: send_ack>>free pbuf\n");
#endif
            pbuf_free(p);
        }
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * ����DHCP�ͻ��˷�����DHCP����������Ϣ�����Բ�ͬ��DHCP��������������Ӧ��Ӧ��
 *
 * @param optptr DHCP msg���������
 * @param len ��������Ĵ��?(byte)
 *
 * @return uint8_t ���ش�����DHCP Server״ֵ̬
 */
///////////////////////////////////////////////////////////////////////////////////
static uint8_t ICACHE_FLASH_ATTR parse_options(uint8_t *optptr, sint16_t len)
{
        struct ip_addr client;
        bool is_dhcp_parse_end = false;
        struct dhcps_state s;

        client.addr = *( (uint32_t *) &client_address);// Ҫ�����DHCP�ͻ��˵�IP

        u8_t *end = optptr + len;
        u16_t type = 0;

        s.state = DHCPS_STATE_IDLE;

        while (optptr < end) {
#if DHCPS_DEBUG
            os_printf("dhcps: (sint16_t)*optptr = %d\n", (sint16_t)*optptr);
#endif
            switch ((sint16_t) *optptr) {

                case DHCP_OPTION_MSG_TYPE:  //53
                        type = *(optptr + 2);
                        break;

                case DHCP_OPTION_REQ_IPADDR://50
                        if( os_memcmp( (char *) &client.addr, (char *) optptr+2,4)==0 ) {
#if DHCPS_DEBUG
                            os_printf("dhcps: DHCP_OPTION_REQ_IPADDR = 0 ok\n");
#endif
                            s.state = DHCPS_STATE_ACK;
                        }else {
#if DHCPS_DEBUG
                            os_printf("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
                os_printf("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
                        os_printf("dhcps: DHCPD_STATE_NAK\n");
#endif
                }
                break;

            case DHCPDECLINE://4
                s.state = DHCPS_STATE_IDLE;
#if DHCPS_DEBUG
                os_printf("dhcps: DHCPD_STATE_IDLE\n");
#endif
                break;

            case DHCPRELEASE://7
                s.state = DHCPS_STATE_RELEASE;
#if DHCPS_DEBUG
                os_printf("dhcps: DHCPD_STATE_IDLE\n");
#endif
                break;
        }
#if DHCPS_DEBUG
        os_printf("dhcps: return s.state = %d\n", s.state);
#endif
        return s.state;
}
///////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////
static sint16_t ICACHE_FLASH_ATTR parse_msg(struct dhcps_msg *m, u16_t len)
{
        if(os_memcmp((char *)m->options,
              &magic_cookie,
              sizeof(magic_cookie)) == 0){
#if DHCPS_DEBUG
            os_printf("dhcps: len = %d\n", len);
#endif
            /*
             * ��¼��ǰ��xid���ﴦ���?
             * �˺�ΪDHCP�ͻ����������û�ͳһ��ȡIPʱ��
            */
//          if((old_xid[0] == 0) &&
//             (old_xid[1] == 0) &&
//             (old_xid[2] == 0) &&
//             (old_xid[3] == 0)){
//              /*
//               * old_xidδ��¼�κ����?
//               * �϶��ǵ�һ��ʹ��
//              */
//              os_memcpy((char *)old_xid, (char *)m->xid, sizeof(m->xid));
//          }else{
//              /*
//               * ���δ����DHCP msg��Я���xid���ϴμ�¼�IJ�ͬ��
//               * �϶�Ϊ��ͬ��DHCP�ͻ��˷��ͣ���ʱ����Ҫ����Ŀͻ���IP
//               * ���� 192.168.4.100(0x6404A8C0) <--> 192.168.4.200(0xC804A8C0)
//               *
//              */
//              if(os_memcmp((char *)old_xid, (char *)m->xid, sizeof(m->xid)) != 0){
                    /*
                     * ��¼���ε�xid�ţ�ͬʱ�����IP����
                    */
                    struct ip_addr addr_tmp;    
//                  os_memcpy((char *)old_xid, (char *)m->xid, sizeof(m->xid));

//                  {
                        struct dhcps_pool *pdhcps_pool = NULL;
                        list_node *pnode = NULL;
                        list_node *pback_node = NULL;
                        struct ip_addr first_address;
                        bool flag = false;

//                      POOL_START:
                        first_address.addr = dhcps_lease.start_ip.addr;
                        client_address.addr = client_address_plus.addr;
                        renew = false;
//                          addr_tmp.addr =  htonl(client_address_plus.addr);
//                          addr_tmp.addr++;
//                          client_address_plus.addr = htonl(addr_tmp.addr);
                        for (pback_node = plist; pback_node != NULL;pback_node = pback_node->pnext) {
                            pdhcps_pool = pback_node->pnode;
                            if (os_memcmp(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac)) == 0){
//                                  os_printf("the same device request ip\n");
                                if (os_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 = DHCPS_LEASE_TIMER;
                                pnode = pback_node;
                                goto POOL_CHECK;
                            } else if (pdhcps_pool->ip.addr == client_address_plus.addr){
//                                  client_address.addr = client_address_plus.addr;
//                                  os_printf("the ip addr has been request\n");
                                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);
                                }
                            }
                        }
                        if (client_address_plus.addr > dhcps_lease.end_ip.addr) {
                            client_address.addr = first_address.addr;
                        }
                        if (client_address.addr > dhcps_lease.end_ip.addr) {
                            client_address_plus.addr = dhcps_lease.start_ip.addr;
                            pdhcps_pool = NULL;
                            pnode = NULL;
                        } else {
                            pdhcps_pool = (struct dhcps_pool *)os_zalloc(sizeof(struct dhcps_pool));
                            pdhcps_pool->ip.addr = client_address.addr;
                            os_memcpy(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac));
                            pdhcps_pool->lease_timer = DHCPS_LEASE_TIMER;
                            pnode = (list_node *)os_zalloc(sizeof(list_node ));
                            pnode->pnode = pdhcps_pool;
                            pnode->pnext = NULL;
                            node_insert_to_list(&plist,pnode);
                            if (client_address.addr == dhcps_lease.end_ip.addr) {
                                client_address_plus.addr = dhcps_lease.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_lease.end_ip.addr) || (ip_addr_isany(&client_address))){
                            os_printf("client_address_plus.addr %x %d\n", client_address_plus.addr, system_get_free_heap_size());
                            if(pnode != NULL) {
                                node_remove_from_list(&plist,pnode);
                                os_free(pnode);
                                pnode = NULL;
                            }

                            if (pdhcps_pool != NULL) {
                                os_free(pdhcps_pool);
                                pdhcps_pool = NULL;
                            }
//                          client_address_plus.addr = dhcps_lease.start_ip.addr;
                            return 4;
                        }

                        sint16_t ret = parse_options(&m->options[4], len);;

                        if(ret == DHCPS_STATE_RELEASE) {
                            if(pnode != NULL) {
                                node_remove_from_list(&plist,pnode);
                                os_free(pnode);
                                pnode = NULL;
                            }

                            if (pdhcps_pool != NULL) {
                                os_free(pdhcps_pool);
                                pdhcps_pool = NULL;
                            }
                            os_memset(&client_address,0x0,sizeof(client_address));
                        }

                        if (wifi_softap_set_station_info(m->chaddr, &client_address) == false) {
                            return 0;
                        }
//                  }

#if DHCPS_DEBUG
                    os_printf("dhcps: xid changed\n");
                    os_printf("dhcps: client_address.addr = %x\n", client_address.addr);
#endif
                   
//              }
                
//          }
            return ret;
        }
        return 0;
}
///////////////////////////////////////////////////////////////////////////////////
/*
 * DHCP ��������ݰ���մ���ص�����˺�����LWIP UDPģ������ʱ������
 * ��Ҫ����udp_recv()������LWIP����ע��.
 *
 * @param arg
 * @param pcb ���յ�UDP��Ŀ��ƿ�?
 * @param p ���յ���UDP�е��������?
 * @param addr ���ʹ�UDP���Դ�����IP��ַ
 * @param port ���ʹ�UDP���Դ�����UDPͨ���˿ں�
 */
///////////////////////////////////////////////////////////////////////////////////
static void ICACHE_FLASH_ATTR handle_dhcp(void *arg, 
                                    struct udp_pcb *pcb, 
                                    struct pbuf *p, 
                                    struct ip_addr *addr, 
                                    uint16_t port)
{
        struct dhcps_msg *pmsg_dhcps = NULL;
        sint16_t tlen = 0;
        u16_t i = 0;
        u16_t dhcps_msg_cnt = 0;
        u8_t *p_dhcps_msg = NULL;
        u8_t *data = NULL;

#if DHCPS_DEBUG
        os_printf("dhcps: handle_dhcp-> receive a packet\n");
#endif
        if (p==NULL) return;

        pmsg_dhcps = (struct dhcps_msg *)os_zalloc(sizeof(struct dhcps_msg));
        if (NULL == pmsg_dhcps){
            pbuf_free(p);
            return;
        }
        p_dhcps_msg = (u8_t *)pmsg_dhcps;
        tlen = p->tot_len;
        data = p->payload;

#if DHCPS_DEBUG
        os_printf("dhcps: handle_dhcp-> p->tot_len = %d\n", tlen);
        os_printf("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                 
            os_printf("%02x ",data[i]);
            if((i+1)%16 == 0){
                os_printf("\n");
            }
#endif
        }
        
        if(p->next != NULL) {
#if DHCPS_DEBUG
            os_printf("dhcps: handle_dhcp-> p->next != NULL\n");
            os_printf("dhcps: handle_dhcp-> p->next->tot_len = %d\n",p->next->tot_len);
            os_printf("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                 
                os_printf("%02x ",data[i]);
                if((i+1)%16 == 0){
                    os_printf("\n");
                }
#endif
            }
        }

        /*
         * DHCP �ͻ���������Ϣ����
        */
#if DHCPS_DEBUG
        os_printf("dhcps: handle_dhcp-> parse_msg(p)\n");
#endif
        
        switch(parse_msg(pmsg_dhcps, tlen - 240)) {

            case DHCPS_STATE_OFFER://1
#if DHCPS_DEBUG            
                 os_printf("dhcps: handle_dhcp-> DHCPD_STATE_OFFER\n");
#endif          
                 send_offer(pmsg_dhcps);
                 break;
            case DHCPS_STATE_ACK://3
#if DHCPS_DEBUG
                 os_printf("dhcps: handle_dhcp-> DHCPD_STATE_ACK\n");
#endif          
                 send_ack(pmsg_dhcps);
                 break;
            case DHCPS_STATE_NAK://4
#if DHCPS_DEBUG            
                 os_printf("dhcps: handle_dhcp-> DHCPD_STATE_NAK\n");
#endif
                 send_nak(pmsg_dhcps);
                 break;
            default :
                 break;
        }
#if DHCPS_DEBUG
        os_printf("dhcps: handle_dhcp-> pbuf_free(p)\n");
#endif
        pbuf_free(p);
        os_free(pmsg_dhcps);
        pmsg_dhcps = NULL;
}
///////////////////////////////////////////////////////////////////////////////////
static void ICACHE_FLASH_ATTR wifi_softap_init_dhcps_lease(uint32 ip)
{
    uint32 softap_ip = 0,local_ip = 0;
    uint32 start_ip = 0;
    uint32 end_ip = 0;
//  if (dhcps_lease_flag) {
    if (dhcps_lease.enable == TRUE) {
        softap_ip = htonl(ip);
        start_ip = htonl(dhcps_lease.start_ip.addr);
        end_ip = htonl(dhcps_lease.end_ip.addr);
        /*config ip information can't contain local ip*/
        if ((start_ip <= softap_ip) && (softap_ip <= end_ip)) {
            dhcps_lease.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_lease.enable = FALSE;
            }
        }
    }

    if (dhcps_lease.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 ++;

        os_bzero(&dhcps_lease, sizeof(dhcps_lease));
        dhcps_lease.start_ip.addr = softap_ip | local_ip;
        dhcps_lease.end_ip.addr = softap_ip | (local_ip + DHCPS_MAX_LEASE - 1);
        dhcps_lease.start_ip.addr = htonl(dhcps_lease.start_ip.addr);
        dhcps_lease.end_ip.addr= htonl(dhcps_lease.end_ip.addr);
    }
//  dhcps_lease.start_ip.addr = htonl(dhcps_lease.start_ip.addr);
//  dhcps_lease.end_ip.addr= htonl(dhcps_lease.end_ip.addr);
//  os_printf("start_ip = 0x%x, end_ip = 0x%x\n",dhcps_lease.start_ip, dhcps_lease.end_ip);
}
///////////////////////////////////////////////////////////////////////////////////
void ICACHE_FLASH_ATTR dhcps_start(struct ip_info *info)
{
    struct netif * apnetif = (struct netif *)eagle_lwip_getif(0x01);
    
    if(apnetif->dhcps_pcb != NULL) {
        udp_remove(apnetif->dhcps_pcb);
    }

    pcb_dhcps = udp_new();
    if (pcb_dhcps == NULL || info ==NULL) {
        os_printf("dhcps_start(): could not obtain pcb\n");
    }

    apnetif->dhcps_pcb = pcb_dhcps;

    IP4_ADDR(&broadcast_dhcps, 255, 255, 255, 255);

    server_address = info->ip;
    if (dns_address.addr == 0) {
        dns_address = server_address;
    }

    wifi_softap_init_dhcps_lease(server_address.addr);
    client_address_plus.addr = dhcps_lease.start_ip.addr;

    udp_bind(pcb_dhcps, &info->ip, DHCPS_SERVER_PORT);
    udp_recv(pcb_dhcps, handle_dhcp, NULL);
#if DHCPS_DEBUG
    os_printf("dhcps:dhcps_start->udp_recv function Set a receive callback handle_dhcp for UDP_PCB pcb_dhcps\n");
#endif
        
}

void ICACHE_FLASH_ATTR dhcps_stop(void)
{
    struct netif * apnetif = (struct netif *)eagle_lwip_getif(0x01);

    udp_disconnect(pcb_dhcps);
//  dhcps_lease_flag = true;
    if(apnetif->dhcps_pcb != NULL) {
        udp_remove(apnetif->dhcps_pcb);
        apnetif->dhcps_pcb = NULL;
    }

    //udp_remove(pcb_dhcps);
    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);
        os_free(pback_node->pnode);
        pback_node->pnode = NULL;
        os_free(pback_node);
        pback_node = NULL;
    }
}

/******************************************************************************
 * FunctionName : wifi_softap_set_dhcps_lease
 * Description  : set the lease information of DHCP server
 * Parameters   : please -- Additional argument to set the lease information,
 *                          Little-Endian.
 * Returns      : true or false
*******************************************************************************/
bool ICACHE_FLASH_ATTR wifi_softap_set_dhcps_lease(struct dhcps_lease *please)
{
    struct ip_info info;
    uint32 softap_ip = 0;
    uint32 start_ip = 0;
    uint32 end_ip = 0;

    uint8 opmode = wifi_get_opmode();

    if (opmode == STATION_MODE || opmode == NULL_MODE) {
        return false;
    }

    if (please == NULL || wifi_softap_dhcps_status() == DHCP_STARTED)
        return false;

    if(please->enable) {
        os_bzero(&info, sizeof(struct ip_info));
        wifi_get_ip_info(SOFTAP_IF, &info);
        softap_ip = htonl(info.ip.addr);
        start_ip = htonl(please->start_ip.addr);
        end_ip = htonl(please->end_ip.addr);

        /*config ip information can't contain local ip*/
        if ((start_ip <= softap_ip) && (softap_ip <= end_ip))
            return false;

        /*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)) {
            return false;
        }

        if (end_ip - start_ip > DHCPS_MAX_LEASE)
            return false;

        os_bzero(&dhcps_lease, sizeof(dhcps_lease));
//      dhcps_lease.start_ip.addr = start_ip;
//      dhcps_lease.end_ip.addr = end_ip;
        dhcps_lease.start_ip.addr = please->start_ip.addr;
        dhcps_lease.end_ip.addr = please->end_ip.addr;
    }
    dhcps_lease.enable = please->enable;
//  dhcps_lease_flag = false;
    return true;
}

/******************************************************************************
 * FunctionName : wifi_softap_get_dhcps_lease
 * Description  : get the lease information of DHCP server
 * Parameters   : please -- Additional argument to get the lease information,
 *                          Little-Endian.
 * Returns      : true or false
*******************************************************************************/
bool ICACHE_FLASH_ATTR wifi_softap_get_dhcps_lease(struct dhcps_lease *please)
{
    uint8 opmode = wifi_get_opmode();

    if (opmode == STATION_MODE || opmode == NULL_MODE) {
        return false;
    }

    if (NULL == please)
        return false;

//  if (dhcps_lease_flag){
    if (dhcps_lease.enable == FALSE){
        if (wifi_softap_dhcps_status() == DHCP_STOPPED)
            return false;
    } else {
//      os_bzero(please, sizeof(dhcps_lease));
//      if (wifi_softap_dhcps_status() == DHCP_STOPPED){
//          please->start_ip.addr = htonl(dhcps_lease.start_ip.addr);
//          please->end_ip.addr = htonl(dhcps_lease.end_ip.addr);
//      }
    }

//  if (wifi_softap_dhcps_status() == DHCP_STARTED){
//      os_bzero(please, sizeof(dhcps_lease));
//      please->start_ip.addr = dhcps_lease.start_ip.addr;
//      please->end_ip.addr = dhcps_lease.end_ip.addr;
//  }
    please->start_ip.addr = dhcps_lease.start_ip.addr;
    please->end_ip.addr = dhcps_lease.end_ip.addr;
    return true;
}

static void ICACHE_FLASH_ATTR 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;
    os_free(minp->pnode);
    minp->pnode = NULL;
    os_free(minp);
    minp = NULL;
}

void ICACHE_FLASH_ATTR dhcps_coarse_tmr(void)
{
    uint8 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);
            os_free(pback_node->pnode);
            pback_node->pnode = NULL;
            os_free(pback_node);
            pback_node = NULL;
        } else {
            pnode = pnode ->pnext;
            num_dhcps_pool ++;
        }
    }

    if (num_dhcps_pool >= MAX_STATION_NUM)
        kill_oldest_dhcps_pool();
}

bool ICACHE_FLASH_ATTR wifi_softap_set_dhcps_offer_option(uint8 level, void* optarg)
{
    bool offer_flag = true;
    uint8 option = 0;
    if (optarg == NULL && wifi_softap_dhcps_status() == false)
        return false;

    if (level <= OFFER_START || level >= OFFER_END)
        return false;

    switch (level){
        case OFFER_ROUTER:
            offer = (*(uint8 *)optarg) & 0x01;
            offer_flag = true;
            break;
        default :
            offer_flag = false;
            break;
    }
    return offer_flag;
}

bool ICACHE_FLASH_ATTR wifi_softap_set_dhcps_lease_time(uint32 minute)
{
    uint8 opmode = wifi_get_opmode();

    if (opmode == STATION_MODE || opmode == NULL_MODE) {
        return false;
    }

    if (wifi_softap_dhcps_status() == DHCP_STARTED) {
        return false;
    }

    if(minute == 0) {
        return false;
    }
    dhcps_lease_time = minute;
    return true;
}

bool ICACHE_FLASH_ATTR wifi_softap_reset_dhcps_lease_time(void)
{
    uint8 opmode = wifi_get_opmode();

    if (opmode == STATION_MODE || opmode == NULL_MODE) {
        return false;
    }

    if (wifi_softap_dhcps_status() == DHCP_STARTED) {
        return false;
    }
    dhcps_lease_time = DHCPS_LEASE_TIME_DEF;
    return true;
}

uint32 ICACHE_FLASH_ATTR wifi_softap_get_dhcps_lease_time(void) // minute
{
    return dhcps_lease_time;
}

void ICACHE_FLASH_ATTR dhcps_set_DNS(struct ip_addr *dns_ip) 
{
    dns_address = *dns_ip;
}

struct dhcps_pool *ICACHE_FLASH_ATTR dhcps_get_mapping(uint16_t no) 
{
list_node *pback_node = NULL;

    for (pback_node = plist; pback_node != NULL;pback_node = pback_node->pnext, no--) {
      if (no == 0) return pback_node->pnode;
    }
    return NULL;
}

void ICACHE_FLASH_ATTR dhcps_set_mapping(struct ip_addr *addr, uint8 *mac, uint32 lease_time) 
{
list_node *pback_node = NULL;
list_node *pnode = NULL;
struct dhcps_pool *pdhcps_pool = NULL;

    pdhcps_pool = (struct dhcps_pool *)os_zalloc(sizeof(struct dhcps_pool));
    pdhcps_pool->ip.addr = addr->addr;
    os_memcpy(pdhcps_pool->mac, mac, sizeof(pdhcps_pool->mac));
    pdhcps_pool->lease_timer = lease_time;
    pnode = (list_node *)os_zalloc(sizeof(list_node ));
    pnode->pnode = pdhcps_pool;
    pnode->pnext = NULL;
    node_insert_to_list(&plist,pnode);
}