Function get_ip

components/net/lwip-dhcpd/dhcp_server.c:171–226

}

static uint8_t get_ip(struct mac_addr_t *p_mac_addr)
{
    static uint8_t next_client_ip = DHCPD_CLIENT_IP_MIN;
    static struct mac_ip_item_t mac_table[MAC_TABLE_LEN];
    static int offset = 0;

    struct mac_addr_t bad_mac;
    int i;
    uint8_t ip_addr_3;

    rt_memset(&bad_mac, 0, sizeof(bad_mac));
    if (!rt_memcmp(&bad_mac, p_mac_addr, sizeof(bad_mac)))
    {
        DEBUG_PRINTF("mac address all zero");
        ip_addr_3 = DHCPD_CLIENT_IP_MAX;
        goto _return;
    }

    rt_memset(&bad_mac, 0xFF, sizeof(bad_mac));
    if (!rt_memcmp(&bad_mac, p_mac_addr, sizeof(bad_mac)))
    {
        DEBUG_PRINTF("mac address all one");
        ip_addr_3 = DHCPD_CLIENT_IP_MAX;
        goto _return;
    }

    for (i = 0; i < MAC_TABLE_LEN; i++)
    {
        if (!rt_memcmp(&mac_table[i].mac_addr, p_mac_addr, sizeof(bad_mac)))
        {
            //use old ip
            ip_addr_3 = mac_table[i].ip_addr_3;
            DEBUG_PRINTF("return old ip: %d\n", (int)ip_addr_3);
            goto _return;
        }
    }

    /* add new ip */
    mac_table[offset].mac_addr = *p_mac_addr;
    mac_table[offset].ip_addr_3  = next_client_ip;
    ip_addr_3 = mac_table[offset].ip_addr_3 ;

    offset++;
    if (offset >= MAC_TABLE_LEN)
        offset = 0;

    next_client_ip++;
    if (next_client_ip > DHCPD_CLIENT_IP_MAX)
        next_client_ip = DHCPD_CLIENT_IP_MIN;

    DEBUG_PRINTF("create new ip: %d\n", (int)ip_addr_3);
    DEBUG_PRINTF("next_client_ip %d\n", next_client_ip);

_return:
    return ip_addr_3;
}

static void dhcpd_thread_entry(void *parameter)