text: /**
   * @file
   * Dynamic Host Configuration Protocol client
   *
   */
  
  /*
   *
   * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
   * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
   * 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. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 a contribution to the lwIP TCP/IP stack.
   * The Swedish Institute of Computer Science and Adam Dunkels
   * are specifically granted permission to redistribute this
   * source code.
   *
   * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
   *
   * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
   * with RFC 2131 and RFC 2132.
   *
   * TODO:
   * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
   *
   * Please coordinate changes and requests with Leon Woestenberg
   * <leon.woestenberg@gmx.net>
   *
   * Integration with your code:
   *
   * In lwip/dhcp.h
   * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
   * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
   *
   * Then have your application call dhcp_coarse_tmr() and
   * dhcp_fine_tmr() on the defined intervals.
   *
   * dhcp_start(struct netif *netif);
   * starts a DHCP client instance which configures the interface by
   * obtaining an IP address lease and maintaining it.
   *
   * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
   * to remove the DHCP client.
   *
   */
  
  #include "lwip/opt.h"
  
  //#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
  
  #include "lwip/stats.h"
  #include "lwip/mem.h"
  #include "lwip/udp.h"
  #include "lwip/ip_addr.h"
  #include "lwip/netif.h"
  #include "lwip/def.h"
  #include "lwip/sys.h"
  #include "lwip/dhcp.h"
  #include "lwip/autoip.h"
  #include "lwip/dns.h"
  #include "netif/etharp.h"
  
  #include <string.h>
  
  /** Default for DHCP_GLOBAL_XID is 0xABCD0000
   * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
   *  #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
   *  #define DHCP_GLOBAL_XID rand()
   */
  #ifdef DHCP_GLOBAL_XID_HEADER
  #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
  #endif
  
  /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
   * MTU is checked to be big enough in dhcp_start */
  #define DHCP_MAX_MSG_LEN(netif)        (netif->mtu)
  #define DHCP_MAX_MSG_LEN_MIN_REQUIRED  576
  /** Minimum length for reply before packet is parsed */
  #define DHCP_MIN_REPLY_LEN             44
  
  #define REBOOT_TRIES 2
  
  /** Option handling: options are parsed in dhcp_parse_reply
   * and saved in an array where other functions can load them from.
   * This might be moved into the struct dhcp (not necessarily since
   * lwIP is single-threaded and the array is only used while in recv
   * callback). */
  #define DHCP_OPTION_IDX_OVERLOAD    0
  #define DHCP_OPTION_IDX_MSG_TYPE    1
  #define DHCP_OPTION_IDX_SERVER_ID   2
  #define DHCP_OPTION_IDX_LEASE_TIME  3
  #define DHCP_OPTION_IDX_T1          4
  #define DHCP_OPTION_IDX_T2          5
  #define DHCP_OPTION_IDX_SUBNET_MASK 6
  #define DHCP_OPTION_IDX_ROUTER      7
  #define DHCP_OPTION_IDX_DNS_SERVER	8
  #define DHCP_OPTION_IDX_MAX         (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
  
  /** Holds the decoded option values, only valid while in dhcp_recv.
      @todo: move this into struct dhcp? */
  u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
  /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
      only valid while in dhcp_recv.
      @todo: move this into struct dhcp? */
  u8_t  dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
  
  #define dhcp_option_given(dhcp, idx)          (dhcp_rx_options_given[idx] != 0)
  #define dhcp_got_option(dhcp, idx)            (dhcp_rx_options_given[idx] = 1)
  #define dhcp_clear_option(dhcp, idx)          (dhcp_rx_options_given[idx] = 0)
  #define dhcp_clear_all_options(dhcp)          (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
  #define dhcp_get_option_value(dhcp, idx)      (dhcp_rx_options_val[idx])
  #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
  
  
  /* DHCP client state machine functions */
  static err_t dhcp_discover(struct netif *netif);
  static err_t dhcp_select(struct netif *netif);
  static void dhcp_bind(struct netif *netif);
  #if DHCP_DOES_ARP_CHECK
  static err_t dhcp_decline(struct netif *netif);
  #endif /* DHCP_DOES_ARP_CHECK */
  static err_t dhcp_rebind(struct netif *netif);
  static err_t dhcp_reboot(struct netif *netif);
  static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
  
  /* receive, unfold, parse and free incoming messages */
  static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
  
  /* set the DHCP timers */
  static void dhcp_timeout(struct netif *netif);
  static void dhcp_t1_timeout(struct netif *netif);
  static void dhcp_t2_timeout(struct netif *netif);
  
  /* build outgoing messages */
  /* create a DHCP message, fill in common headers */
  static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
  /* free a DHCP request */
  static void dhcp_delete_msg(struct dhcp *dhcp);
  /* add a DHCP option (type, then length in bytes) */
  static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
  /* add option values */
  static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
  static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
  static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
  /* always add the DHCP options trailer to end and pad */
  static void dhcp_option_trailer(struct dhcp *dhcp);
  
  /**
   * Back-off the DHCP client (because of a received NAK response).
   *
   * Back-off the DHCP client because of a received NAK. Receiving a
   * NAK means the client asked for something non-sensible, for
   * example when it tries to renew a lease obtained on another network.
   *
   * We clear any existing set IP address and restart DHCP negotiation
   * afresh (as per RFC2131 3.2.3).
   *
   * @param netif the netif under DHCP control
   */
  static void
  dhcp_handle_nak(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n", 
      (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
    /* Set the interface down since the address must no longer be used, as per RFC2131 */
    netif_set_down(netif);
    /* remove IP address from interface */
    netif_set_ipaddr(netif, IP_ADDR_ANY);
    netif_set_gw(netif, IP_ADDR_ANY);
    netif_set_netmask(netif, IP_ADDR_ANY); 
    /* Change to a defined state */
    dhcp_set_state(dhcp, DHCP_BACKING_OFF);
    /* We can immediately restart discovery */
    dhcp_discover(netif);
  }
  
  #if DHCP_DOES_ARP_CHECK
  /**
   * Checks if the offered IP address is already in use.
   *
   * It does so by sending an ARP request for the offered address and
   * entering CHECKING state. If no ARP reply is received within a small
   * interval, the address is assumed to be free for use by us.
   *
   * @param netif the netif under DHCP control
   */
  static void
  dhcp_check(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result;
    u16_t msecs;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
      (s16_t)netif->name[1]));
    dhcp_set_state(dhcp, DHCP_CHECKING);
    /* create an ARP query for the offered IP address, expecting that no host
       responds, as the IP address should not be in use. */
  
    // anton@: keep silence
    //result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
    //if (result != ERR_OK) {
    //  LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
    //}
    dhcp->tries++;
    msecs = 500;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
  }
  #endif /* DHCP_DOES_ARP_CHECK */
  
  /**
   * Remember the configuration offered by a DHCP server.
   *
   * @param netif the netif under DHCP control
   */
  static void
  dhcp_handle_offer(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
      (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
    /* obtain the server address */
    if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
      ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
        ip4_addr_get_u32(&dhcp->server_ip_addr)));
      /* remember offered address */
      ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
        ip4_addr_get_u32(&dhcp->offered_ip_addr)));
  
      //dhcp_select(netif);
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
        ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
    }
  }
  
  /**
   * Select a DHCP server offer out of all offers.
   *
   * Simply select the first offer received.
   *
   * @param netif the netif under DHCP control
   * @return lwIP specific error (see error.h)
   */
  static err_t
  dhcp_select(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result;
    u16_t msecs;
  
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
    dhcp_set_state(dhcp, DHCP_REQUESTING);
  
    if ( ( netif->flags & NETIF_FLAG_DHCP_NO_DISCOVER ) != NETIF_FLAG_DHCP_NO_DISCOVER ){
  	  /* create and initialize the DHCP message header */
  	  result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
  	  if (result == ERR_OK) {
  		dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
  		dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
  
  		/* MUST request the offered IP address */
  		dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
  		dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
  
  		dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
  		dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
  
  		dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
  		dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
  		dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
  		dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
  		dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
  
  	#if LWIP_NETIF_HOSTNAME
  		if (netif->hostname != NULL) {
  		  const char *p = (const char*)netif->hostname;
  		  u8_t namelen = (u8_t)strlen(p);
  		  if (namelen > 0) {
  			LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
  			dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
  			while (*p) {
  			  dhcp_option_byte(dhcp, *p++);
  			}
  		  }
  		}
  	#endif /* LWIP_NETIF_HOSTNAME */
  
  		dhcp_option_trailer(dhcp);
  		/* shrink the pbuf to the actual content length */
  		pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
  
  		/* send broadcast to any DHCP server */
  		udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
  		dhcp_delete_msg(dhcp);
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
  	  } else {
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
  	  }
    }
    dhcp->tries++;
    msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
    return result;
  }
  
  /**
   * The DHCP timer that checks for lease renewal/rebind timeouts.
   */
  void
  dhcp_coarse_tmr()
  {
    struct netif *netif = netif_list;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
    /* iterate through all network interfaces */
    while (netif != NULL) {
      /* only act on DHCP configured interfaces */
      if (netif->dhcp != NULL) {
        /* timer is active (non zero), and triggers (zeroes) now? */
        if (netif->dhcp->t2_timeout-- == 1) {
          LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
          /* this clients' rebind timeout triggered */
          dhcp_t2_timeout(netif);
        /* timer is active (non zero), and triggers (zeroes) now */
        } else if (netif->dhcp->t1_timeout-- == 1) {
          LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
          /* this clients' renewal timeout triggered */
          dhcp_t1_timeout(netif);
        }
      }
      /* proceed to next netif */
      netif = netif->next;
    }
  }
  
  /**
   * DHCP transaction timeout handling
   *
   * A DHCP server is expected to respond within a short period of time.
   * This timer checks whether an outstanding DHCP request is timed out.
   */
  void
  dhcp_fine_tmr()
  {
    struct netif *netif = netif_list;
    /* loop through netif's */
    while (netif != NULL) {
      /* only act on DHCP configured interfaces */
      if (netif->dhcp != NULL) {
        /* timer is active (non zero), and is about to trigger now */      
        if (netif->dhcp->request_timeout > 1) {
          netif->dhcp->request_timeout--;
        }
        else if (netif->dhcp->request_timeout == 1) {
          netif->dhcp->request_timeout--;
          /* { netif->dhcp->request_timeout == 0 } */
          LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
          /* this client's request timeout triggered */
          dhcp_timeout(netif);
        }
      }
      /* proceed to next network interface */
      netif = netif->next;
    }
  }
  
  /**
   * A DHCP negotiation transaction, or ARP request, has timed out.
   *
   * The timer that was started with the DHCP or ARP request has
   * timed out, indicating no response was received in time.
   *
   * @param netif the netif under DHCP control
   */
  static void
  dhcp_timeout(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
    /* back-off period has passed, or server selection timed out */
    if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
      dhcp_discover(netif);
    /* receiving the requested lease timed out */
    } else if (dhcp->state == DHCP_REQUESTING) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
      if (dhcp->tries <= 5) {
        dhcp_select(netif);
      } else {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
        dhcp_release(netif);
        dhcp_discover(netif);
      }
  #if DHCP_DOES_ARP_CHECK
    /* received no ARP reply for the offered address (which is good) */
    } else if (dhcp->state == DHCP_CHECKING) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
      if (dhcp->tries <= 1) {
        dhcp_check(netif);
      /* no ARP replies on the offered address,
         looks like the IP address is indeed free */
      } else {
        /* bind the interface to the offered address */
        dhcp_bind(netif);
      }
  #endif /* DHCP_DOES_ARP_CHECK */
    }
    /* did not get response to renew request? */
    else if (dhcp->state == DHCP_RENEWING) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
      /* just retry renewal */
      /* note that the rebind timer will eventually time-out if renew does not work */
      dhcp_renew(netif);
    /* did not get response to rebind request? */
    } else if (dhcp->state == DHCP_REBINDING) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
      if (dhcp->tries <= 8) {
        dhcp_rebind(netif);
      } else {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
        dhcp_release(netif);
        dhcp_discover(netif);
      }
    } else if (dhcp->state == DHCP_REBOOTING) {
      if (dhcp->tries < REBOOT_TRIES) {
        dhcp_reboot(netif);
      } else {
        dhcp_discover(netif);
      }
    }
  }
  
  /**
   * The renewal period has timed out.
   *
   * @param netif the netif under DHCP control
   */
  static void
  dhcp_t1_timeout(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
    if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
        (dhcp->state == DHCP_RENEWING)) {
      /* just retry to renew - note that the rebind timer (t2) will
       * eventually time-out if renew tries fail. */
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
                  ("dhcp_t1_timeout(): must renew\n"));
      /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
         DHCP_RENEWING, not DHCP_BOUND */
      dhcp_renew(netif);
    }
  }
  
  /**
   * The rebind period has timed out.
   *
   * @param netif the netif under DHCP control
   */
  static void
  dhcp_t2_timeout(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
    if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
        (dhcp->state == DHCP_RENEWING)) {
      /* just retry to rebind */
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
                  ("dhcp_t2_timeout(): must rebind\n"));
      /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
         DHCP_REBINDING, not DHCP_BOUND */
      dhcp_rebind(netif);
    }
  }
  
  /**
   * Handle a DHCP ACK packet
   *
   * @param netif the netif under DHCP control
   */
  static void
  dhcp_handle_ack(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
  #if LWIP_DNS
    u8_t n;
  #endif /* LWIP_DNS */
  
    /* clear options we might not get from the ACK */
    ip_addr_set_zero(&dhcp->offered_sn_mask);
    ip_addr_set_zero(&dhcp->offered_gw_addr);
  #if LWIP_DHCP_BOOTP_FILE
    ip_addr_set_zero(&dhcp->offered_si_addr);
  #endif /* LWIP_DHCP_BOOTP_FILE */
  
    /* lease time given? */
    if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
      /* remember offered lease time */
      dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
    }
    /* renewal period given? */
    if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
      /* remember given renewal period */
      dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
    } else {
      /* calculate safe periods for renewal */
      dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
    }
  
    /* renewal period given? */
    if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
      /* remember given rebind period */
      dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
    } else {
      /* calculate safe periods for rebinding */
      dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
    }
  
    /* (y)our internet address */
    if ( dhcp->msg_in->yiaddr.addr == 0 ){
  	  ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->ciaddr);
    } else {
  	  ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
    }
  
  #if LWIP_DHCP_BOOTP_FILE
    /* copy boot server address,
       boot file name copied in dhcp_parse_reply if not overloaded */
    ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
  #endif /* LWIP_DHCP_BOOTP_FILE */
  
    /* subnet mask given? */
    if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
      /* remember given subnet mask */
      ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
      dhcp->subnet_mask_given = 1;
    } else {
      dhcp->subnet_mask_given = 0;
    }
  
    /* gateway router */
    if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
      ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
    }
    
  #if LWIP_DNS
    /* DNS servers */
    n = 0;
    while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
      ip_addr_t dns_addr;
      ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
      dns_setserver(n, &dns_addr);
      n++;
    }
  #endif /* LWIP_DNS */
  }
  
  /** Set a statically allocated struct dhcp to work with.
   * Using this prevents dhcp_start to allocate it using mem_malloc.
   *
   * @param netif the netif for which to set the struct dhcp
   * @param dhcp (uninitialized) dhcp struct allocated by the application
   */
  void
  dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
  {
    LWIP_ASSERT("netif != NULL", netif != NULL);
    LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
    LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
  
    /* clear data structure */
    memset(dhcp, 0, sizeof(struct dhcp));
    /* dhcp_set_state(&dhcp, DHCP_OFF); */
    netif->dhcp = dhcp;
  }
  
  /** Removes a struct dhcp from a netif.
   *
   * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
   *            struct dhcp since the memory is passed back to the heap.
   *
   * @param netif the netif from which to remove the struct dhcp
   */
  void dhcp_cleanup(struct netif *netif)
  {
    LWIP_ASSERT("netif != NULL", netif != NULL);
  
    if (netif->dhcp != NULL) {
      mem_free(netif->dhcp);
      netif->dhcp = NULL;
    }
  }
  
  /**
   * Start DHCP negotiation for a network interface.
   *
   * If no DHCP client instance was attached to this interface,
   * a new client is created first. If a DHCP client instance
   * was already present, it restarts negotiation.
   *
   * @param netif The lwIP network interface
   * @return lwIP error code
   * - ERR_OK - No error
   * - ERR_MEM - Out of memory
   */
  err_t
  dhcp_start(struct netif *netif)
  {
    struct dhcp *dhcp;
    err_t result = ERR_OK;
  
    LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
    dhcp = netif->dhcp;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
    /* Remove the flag that says this netif is handled by DHCP,
       it is set when we succeeded starting. */
    netif->flags &= ~NETIF_FLAG_DHCP;
  
    /* check hwtype of the netif */
    if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
      return ERR_ARG;
    }
  
    /* check MTU of the netif */
    if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
      return ERR_MEM;
    }
  
    /* no DHCP client attached yet? */
    if (dhcp == NULL) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
      dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
      if (dhcp == NULL) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
        return ERR_MEM;
      }
      /* store this dhcp client in the netif */
      netif->dhcp = dhcp;
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
    /* already has DHCP client attached */
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
      if (dhcp->pcb != NULL) {
        udp_remove(dhcp->pcb);
      }
      LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
      LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
    }
      
    /* clear data structure */
    memset(dhcp, 0, sizeof(struct dhcp));
    /* dhcp_set_state(&dhcp, DHCP_OFF); */
    /* allocate UDP PCB */
    dhcp->pcb = udp_new();
    if (dhcp->pcb == NULL) {
      LWIP_DEBUGF(DHCP_DEBUG  | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
      return ERR_MEM;
    }
    dhcp->pcb->so_options |= SOF_BROADCAST;
    /* set up local and remote port for the pcb */
    udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
    udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
    /* set up the recv callback and argument */
    udp_recv(dhcp->pcb, dhcp_recv, netif);
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
  
    /* (re)start the DHCP negotiation */
    result = dhcp_discover(netif);
    if (result != ERR_OK) {
  	/* free resources allocated above */
  	dhcp_stop(netif);
  	return ERR_MEM;
    }
  
    /* Set the flag that says this netif is handled by DHCP. */
    netif->flags |= NETIF_FLAG_DHCP;
    return result;
  }
  
  /**
   * Inform a DHCP server of our manual configuration.
   *
   * This informs DHCP servers of our fixed IP address configuration
   * by sending an INFORM message. It does not involve DHCP address
   * configuration, it is just here to be nice to the network.
   *
   * @param netif The lwIP network interface
   */
  void
  dhcp_inform(struct netif *netif)
  {
    struct dhcp dhcp;
    err_t result = ERR_OK;
    struct udp_pcb *pcb;
  
    LWIP_ERROR("netif != NULL", (netif != NULL), return;);
  
    memset(&dhcp, 0, sizeof(struct dhcp));
    dhcp_set_state(&dhcp, DHCP_INFORM);
  
    if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
      /* re-use existing pcb */
      pcb = netif->dhcp->pcb;
    } else {
      pcb = udp_new();
      if (pcb == NULL) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
        return;
      }
      dhcp.pcb = pcb;
      dhcp.pcb->so_options |= SOF_BROADCAST;
      udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
    }
    /* create and initialize the DHCP message header */
    result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
    if (result == ERR_OK) {
      dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
      dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
  
      dhcp_option_trailer(&dhcp);
  
      pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
  
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
      udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
      dhcp_delete_msg(&dhcp);
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
    }
  
    if (dhcp.pcb != NULL) {
      /* otherwise, the existing pcb was used */
      udp_remove(dhcp.pcb);
    }
  }
  
  /** Handle a possible change in the network configuration.
   *
   * This enters the REBOOTING state to verify that the currently bound
   * address is still valid.
   */
  void
  dhcp_network_changed(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    if (!dhcp)
      return;
    switch (dhcp->state) {
    case DHCP_REBINDING:
    case DHCP_RENEWING:
    case DHCP_BOUND:
    case DHCP_REBOOTING:
      netif_set_down(netif);
      dhcp->tries = 0;
      dhcp_reboot(netif);
      break;
    case DHCP_OFF:
      /* stay off */
      break;
    default:
      dhcp->tries = 0;
  #if LWIP_DHCP_AUTOIP_COOP
      if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
        autoip_stop(netif);
        dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
      }
  #endif /* LWIP_DHCP_AUTOIP_COOP */
      dhcp_discover(netif);
      break;
    }
  }
  
  #if DHCP_DOES_ARP_CHECK
  /**
   * Match an ARP reply with the offered IP address.
   *
   * @param netif the network interface on which the reply was received
   * @param addr The IP address we received a reply from
   */
  void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
  {
    LWIP_ERROR("netif != NULL", (netif != NULL), return;);
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
    /* is a DHCP client doing an ARP check? */
    if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
        ip4_addr_get_u32(addr)));
      /* did a host respond with the address we
         were offered by the DHCP server? */
      if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
        /* we will not accept the offered address */
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
          ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
        dhcp_decline(netif);
      }
    }
  }
  
  /**
   * Decline an offered lease.
   *
   * Tell the DHCP server we do not accept the offered address.
   * One reason to decline the lease is when we find out the address
   * is already in use by another host (through ARP).
   *
   * @param netif the netif under DHCP control
   */
  static err_t
  dhcp_decline(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result = ERR_OK;
    u16_t msecs;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
    dhcp_set_state(dhcp, DHCP_BACKING_OFF);
    /* create and initialize the DHCP message header */
    result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
    if (result == ERR_OK) {
      dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
      dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
  
      dhcp_option_trailer(dhcp);
      /* resize pbuf to reflect true size of options */
      pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
  
      /* per section 4.4.4, broadcast DECLINE messages */
      udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
      dhcp_delete_msg(dhcp);
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
        ("dhcp_decline: could not allocate DHCP request\n"));
    }
    dhcp->tries++;
    msecs = 10*1000;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
    return result;
  }
  #endif /* DHCP_DOES_ARP_CHECK */
  
  
  /**
   * Start the DHCP process, discover a DHCP server.
   *
   * @param netif the netif under DHCP control
   */
  static err_t
  dhcp_discover(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result = ERR_OK;
    u16_t msecs;
  
    return result;
  
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
    ip_addr_set_any(&dhcp->offered_ip_addr);
    dhcp_set_state(dhcp, DHCP_SELECTING);
  
    if ( ( netif->flags & NETIF_FLAG_DHCP_NO_DISCOVER ) != NETIF_FLAG_DHCP_NO_DISCOVER ){
  	  /* create and initialize the DHCP message header */
  	  result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
  	  if (result == ERR_OK) {
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
  
  		dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
  		dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
  
  		dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
  		dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
  		dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
  		dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
  		dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
  
  		dhcp_option_trailer(dhcp);
  
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
  		pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
  
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
  		udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
  		dhcp_delete_msg(dhcp);
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
  	  } else {
  		LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
  	  }
    }
    dhcp->tries++;
  #if LWIP_DHCP_AUTOIP_COOP
    if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
      dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
      autoip_start(netif);
    }
  #endif /* LWIP_DHCP_AUTOIP_COOP */
    msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
    return result;
  }
  
  
  /**
   * Bind the interface to the offered IP address.
   *
   * @param netif network interface to bind to the offered address
   */
  static void
  dhcp_bind(struct netif *netif)
  {
    u32_t timeout;
    struct dhcp *dhcp;
    ip_addr_t sn_mask, gw_addr;
    LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
    dhcp = netif->dhcp;
    LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
  
    /* temporary DHCP lease? */
    if (dhcp->offered_t1_renew != 0xffffffffUL) {
      /* set renewal period timer */
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
      timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
      if(timeout > 0xffff) {
        timeout = 0xffff;
      }
      dhcp->t1_timeout = (u16_t)timeout;
      if (dhcp->t1_timeout == 0) {
        dhcp->t1_timeout = 1;
      }
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
    }
    /* set renewal period timer */
    if (dhcp->offered_t2_rebind != 0xffffffffUL) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
      timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
      if(timeout > 0xffff) {
        timeout = 0xffff;
      }
      dhcp->t2_timeout = (u16_t)timeout;
      if (dhcp->t2_timeout == 0) {
        dhcp->t2_timeout = 1;
      }
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
    }
  
    if (dhcp->subnet_mask_given) {
      /* copy offered network mask */
      ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
    } else {
      /* subnet mask not given, choose a safe subnet mask given the network class */
      u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
      if (first_octet <= 127) {
        ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
      } else if (first_octet >= 192) {
        ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
      } else {
        ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
      }
    }
  
    ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
    /* gateway address not given? */
    if (ip_addr_isany(&gw_addr)) {
      /* copy network address */
      ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
      /* use first host address on network as gateway */
      ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
    }
  
  #if LWIP_DHCP_AUTOIP_COOP
    if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
      autoip_stop(netif);
      dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
    }
  #endif /* LWIP_DHCP_AUTOIP_COOP */
  
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
      ip4_addr_get_u32(&dhcp->offered_ip_addr)));
    netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
      ip4_addr_get_u32(&sn_mask)));
    netif_set_netmask(netif, &sn_mask);
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
      ip4_addr_get_u32(&gw_addr)));
    netif_set_gw(netif, &gw_addr);
    /* bring the interface up */
    netif_set_up(netif);
    /* netif is now bound to DHCP leased address */
    dhcp_set_state(dhcp, DHCP_BOUND);
  }
  
  /**
   * Renew an existing DHCP lease at the involved DHCP server.
   *
   * @param netif network interface which must renew its lease
   */
  err_t
  dhcp_renew(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result;
    u16_t msecs;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
    dhcp_set_state(dhcp, DHCP_RENEWING);
  
    /* create and initialize the DHCP message header */
    result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
    if (result == ERR_OK) {
      dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
      dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
  
  #if LWIP_NETIF_HOSTNAME
      if (netif->hostname != NULL) {
        const char *p = (const char*)netif->hostname;
        u8_t namelen = (u8_t)strlen(p);
        if (namelen > 0) {
          LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
          dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
          while (*p) {
            dhcp_option_byte(dhcp, *p++);
          }
        }
      }
  #endif /* LWIP_NETIF_HOSTNAME */
  
  #if 0
      dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
      dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
  #endif
  
  #if 0
      dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
      dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
  #endif
      /* append DHCP message trailer */
      dhcp_option_trailer(dhcp);
  
      pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
  
      udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
      dhcp_delete_msg(dhcp);
  
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
    }
    dhcp->tries++;
    /* back-off on retries, but to a maximum of 20 seconds */
    msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
    return result;
  }
  
  /**
   * Rebind with a DHCP server for an existing DHCP lease.
   *
   * @param netif network interface which must rebind with a DHCP server
   */
  static err_t
  dhcp_rebind(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result;
    u16_t msecs;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
    dhcp_set_state(dhcp, DHCP_REBINDING);
  
    /* create and initialize the DHCP message header */
    result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
    if (result == ERR_OK) {
      dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
      dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
  
  #if LWIP_NETIF_HOSTNAME
      if (netif->hostname != NULL) {
        const char *p = (const char*)netif->hostname;
        u8_t namelen = (u8_t)strlen(p);
        if (namelen > 0) {
          LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
          dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
          while (*p) {
            dhcp_option_byte(dhcp, *p++);
          }
        }
      }
  #endif /* LWIP_NETIF_HOSTNAME */
  
  #if 0
      dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
      dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
  
      dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
      dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
  #endif
  
      dhcp_option_trailer(dhcp);
  
      pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
  
      /* broadcast to server */
      udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
      dhcp_delete_msg(dhcp);
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
    }
    dhcp->tries++;
    msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
    return result;
  }
  
  /**
   * Enter REBOOTING state to verify an existing lease
   *
   * @param netif network interface which must reboot
   */
  static err_t
  dhcp_reboot(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result;
    u16_t msecs;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
    dhcp_set_state(dhcp, DHCP_REBOOTING);
  
    /* create and initialize the DHCP message header */
    result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
    if (result == ERR_OK) {
      dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
      dhcp_option_short(dhcp, 576);
  
      dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
      dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
  
      dhcp_option_trailer(dhcp);
  
      pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
  
      /* broadcast to server */
      udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
      dhcp_delete_msg(dhcp);
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
    }
    dhcp->tries++;
    msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
    return result;
  }
  
  
  /**
   * Release a DHCP lease.
   *
   * @param netif network interface which must release its lease
   */
  err_t
  dhcp_release(struct netif *netif)
  {
    struct dhcp *dhcp = netif->dhcp;
    err_t result;
    u16_t msecs;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
  
    /* idle DHCP client */
    dhcp_set_state(dhcp, DHCP_OFF);
    /* clean old DHCP offer */
    ip_addr_set_zero(&dhcp->server_ip_addr);
    ip_addr_set_zero(&dhcp->offered_ip_addr);
    ip_addr_set_zero(&dhcp->offered_sn_mask);
    ip_addr_set_zero(&dhcp->offered_gw_addr);
  #if LWIP_DHCP_BOOTP_FILE
    ip_addr_set_zero(&dhcp->offered_si_addr);
  #endif /* LWIP_DHCP_BOOTP_FILE */
    dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
    
    /* create and initialize the DHCP message header */
    result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
    if (result == ERR_OK) {
      dhcp_option_trailer(dhcp);
  
      pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
  
      udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
      dhcp_delete_msg(dhcp);
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
    }
    dhcp->tries++;
    msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
    dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
    /* bring the interface down */
    netif_set_down(netif);
    /* remove IP address from interface */
    netif_set_ipaddr(netif, IP_ADDR_ANY);
    netif_set_gw(netif, IP_ADDR_ANY);
    netif_set_netmask(netif, IP_ADDR_ANY);
    
    return result;
  }
  
  /**
   * Remove the DHCP client from the interface.
   *
   * @param netif The network interface to stop DHCP on
   */
  void
  dhcp_stop(struct netif *netif)
  {
    struct dhcp *dhcp;
    LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
    dhcp = netif->dhcp;
    /* Remove the flag that says this netif is handled by DHCP. */
    netif->flags &= ~NETIF_FLAG_DHCP;
  
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
    /* netif is DHCP configured? */
    if (dhcp != NULL) {
  #if LWIP_DHCP_AUTOIP_COOP
      if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
        autoip_stop(netif);
        dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
      }
  #endif /* LWIP_DHCP_AUTOIP_COOP */
  
      if (dhcp->pcb != NULL) {
        udp_remove(dhcp->pcb);
        dhcp->pcb = NULL;
      }
      LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
      dhcp_set_state(dhcp, DHCP_OFF);
    }
  }
  
  /*
   * Set the DHCP state of a DHCP client.
   *
   * If the state changed, reset the number of tries.
   */
  static void
  dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
  {
    if (new_state != dhcp->state) {
      dhcp->state = new_state;
      dhcp->tries = 0;
      dhcp->request_timeout = 0;
    }
  }
  
  /*
   * Concatenate an option type and length field to the outgoing
   * DHCP message.
   *
   */
  static void
  dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
  {
    LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
    dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
    dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
  }
  /*
   * Concatenate a single byte to the outgoing DHCP message.
   *
   */
  static void
  dhcp_option_byte(struct dhcp *dhcp, u8_t value)
  {
    LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
    dhcp->msg_out->options[dhcp->options_out_len++] = value;
  }
  
  static void
  dhcp_option_short(struct dhcp *dhcp, u16_t value)
  {
    LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
    dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
    dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
  }
  
  static void
  dhcp_option_long(struct dhcp *dhcp, u32_t value)
  {
    LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
    dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
    dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
    dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
    dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
  }
  
  /**
   * Extract the DHCP message and the DHCP options.
   *
   * Extract the DHCP message and the DHCP options, each into a contiguous
   * piece of memory. As a DHCP message is variable sized by its options,
   * and also allows overriding some fields for options, the easy approach
   * is to first unfold the options into a conitguous piece of memory, and
   * use that further on.
   *
   */
  static err_t
  dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
  {
    u8_t *options;
    u16_t offset;
    u16_t offset_max;
    u16_t options_idx;
    u16_t options_idx_max;
    struct pbuf *q;
    int parse_file_as_options = 0;
    int parse_sname_as_options = 0;
  
    /* clear received options */
    dhcp_clear_all_options(dhcp);
    /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
    if (p->len < DHCP_SNAME_OFS) {
      return ERR_BUF;
    }
    dhcp->msg_in = (struct dhcp_msg *)p->payload;
  #if LWIP_DHCP_BOOTP_FILE
    /* clear boot file name */
    dhcp->boot_file_name[0] = 0;
  #endif /* LWIP_DHCP_BOOTP_FILE */
  
    /* parse options */
  
    /* start with options field */
    options_idx = DHCP_OPTIONS_OFS;
    /* parse options to the end of the received packet */
    options_idx_max = p->tot_len;
  again:
    q = p;
    while((q != NULL) && (options_idx >= q->len)) {
      options_idx -= q->len;
      options_idx_max -= q->len;
      q = q->next;
    }
    if (q == NULL) {
      return ERR_BUF;
    }
    offset = options_idx;
    offset_max = options_idx_max;
    options = (u8_t*)q->payload;
    /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
    while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
      u8_t op = options[offset];
      u8_t len;
      u8_t decode_len = 0;
      int decode_idx = -1;
      u16_t val_offset = offset + 2;
      /* len byte might be in the next pbuf */
      if (offset + 1 < q->len) {
        len = options[offset + 1];
      } else {
        len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
      }
      /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
      decode_len = len;
      switch(op) {
        /* case(DHCP_OPTION_END): handled above */
        case(DHCP_OPTION_PAD):
          /* special option: no len encoded */
          decode_len = len = 0;
          /* will be increased below */
          offset--;
          break;
        case(DHCP_OPTION_SUBNET_MASK):
          LWIP_ASSERT("len == 4", len == 4);
          decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
          break;
        case(DHCP_OPTION_ROUTER):
          decode_len = 4; /* only copy the first given router */
          LWIP_ASSERT("len >= decode_len", len >= decode_len);
          decode_idx = DHCP_OPTION_IDX_ROUTER;
          break;
        case(DHCP_OPTION_DNS_SERVER):
          /* special case: there might be more than one server */
          LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
          /* limit number of DNS servers */
          decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
          LWIP_ASSERT("len >= decode_len", len >= decode_len);
          decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
          break;
        case(DHCP_OPTION_LEASE_TIME):
          LWIP_ASSERT("len == 4", len == 4);
          decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
          break;
        case(DHCP_OPTION_OVERLOAD):
          LWIP_ASSERT("len == 1", len == 1);
          decode_idx = DHCP_OPTION_IDX_OVERLOAD;
          break;
        case(DHCP_OPTION_MESSAGE_TYPE):
          LWIP_ASSERT("len == 1", len == 1);
          decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
          break;
        case(DHCP_OPTION_SERVER_ID):
          LWIP_ASSERT("len == 4", len == 4);
          decode_idx = DHCP_OPTION_IDX_SERVER_ID;
          break;
        case(DHCP_OPTION_T1):
          LWIP_ASSERT("len == 4", len == 4);
          decode_idx = DHCP_OPTION_IDX_T1;
          break;
        case(DHCP_OPTION_T2):
          LWIP_ASSERT("len == 4", len == 4);
          decode_idx = DHCP_OPTION_IDX_T2;
          break;
        default:
          decode_len = 0;
          LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
          break;
      }
      offset += len + 2;
      if (decode_len > 0) {
        u32_t value = 0;
        u16_t copy_len;
  decode_next:
        LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
        LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
        copy_len = LWIP_MIN(decode_len, 4);
        pbuf_copy_partial(q, &value, copy_len, val_offset);
        if (decode_len > 4) {
          /* decode more than one u32_t */
          LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
          dhcp_got_option(dhcp, decode_idx);
          dhcp_set_option_value(dhcp, decode_idx, htonl(value));
          decode_len -= 4;
          val_offset += 4;
          decode_idx++;
          goto decode_next;
        } else if (decode_len == 4) {
          value = ntohl(value);
        } else {
          LWIP_ASSERT("invalid decode_len", decode_len == 1);
          value = ((u8_t*)&value)[0];
        }
        dhcp_got_option(dhcp, decode_idx);
        dhcp_set_option_value(dhcp, decode_idx, value);
      }
      if (offset >= q->len) {
        offset -= q->len;
        offset_max -= q->len;
        q = q->next;
        options = (u8_t*)q->payload;
      }
    }
    /* is this an overloaded message? */
    if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
      u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
      dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
      if (overload == DHCP_OVERLOAD_FILE) {
        parse_file_as_options = 1;
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
      } else if (overload == DHCP_OVERLOAD_SNAME) {
        parse_sname_as_options = 1;
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
      } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
        parse_sname_as_options = 1;
        parse_file_as_options = 1;
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
      } else {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
      }
  #if LWIP_DHCP_BOOTP_FILE
      if (!parse_file_as_options) {
        /* only do this for ACK messages */
        if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
          (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
        /* copy bootp file name, don't care for sname (server hostname) */
        pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
        /* make sure the string is really NULL-terminated */
        dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
      }
  #endif /* LWIP_DHCP_BOOTP_FILE */
    }
    if (parse_file_as_options) {
      /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
      parse_file_as_options = 0;
      options_idx = DHCP_FILE_OFS;
      options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
      goto again;
    } else if (parse_sname_as_options) {
      parse_sname_as_options = 0;
      options_idx = DHCP_SNAME_OFS;
      options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
      goto again;
    }
    return ERR_OK;
  }
  
  /**
   * If an incoming DHCP message is in response to us, then trigger the state machine
   */
  static void
  dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
  {
    struct netif *netif = (struct netif *)arg;
    struct dhcp *dhcp = netif->dhcp;
    struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
    u8_t msg_type;
    u8_t i;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
      ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
    /* prevent warnings about unused arguments */
    LWIP_UNUSED_ARG(pcb);
    LWIP_UNUSED_ARG(addr);
    LWIP_UNUSED_ARG(port);
  
    LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
  
    if (p->len < DHCP_MIN_REPLY_LEN) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
      goto free_pbuf_and_return;
    }
  
    if (reply_msg->op != DHCP_BOOTREPLY) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
      goto free_pbuf_and_return;
    }
    /* iterate through hardware address and match against DHCP message */
    for (i = 0; i < netif->hwaddr_len; i++) {
      if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
          ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
          (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
        goto free_pbuf_and_return;
      }
    }
    /* match transaction ID against what we expected */
    if (ntohl(reply_msg->xid) != dhcp->xid) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
        ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
  	// anton@: we can et dhcp messages without discovering
      //goto free_pbuf_and_return;
    }
    /* option fields could be unfold? */
    if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
        ("problem unfolding DHCP message - too short on memory?\n"));
      goto free_pbuf_and_return;
    }
  
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
    /* obtain pointer to DHCP message type */
    if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
      goto free_pbuf_and_return;
    }
  
    /* read DHCP message type */
    msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
    /* message type is DHCP ACK? */
    if (msg_type == DHCP_ACK) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
      /* in requesting state? */
      //if (dhcp->state == DHCP_REQUESTING || dhcp->state == DHCP_BOUND ) {
        dhcp_handle_ack(netif);
  #if 0 //DHCP_DOES_ARP_CHECK
        /* check if the acknowledged lease address is already in use */
        dhcp_check(netif);
  #else
        /* bind interface to the acknowledged lease address */
        dhcp_bind(netif);
  #endif
      //}
     // /* already bound to the given lease address? */
      //else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
     //   dhcp_bind(netif);
     // }
    }
    /* received a DHCP_NAK in appropriate state? */
    else if ((msg_type == DHCP_NAK)/* &&
      ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
       (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING  ))*/) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
      dhcp_handle_nak(netif);
    }
    /* received a DHCP_OFFER in DHCP_SELECTING state? */
    else if ((msg_type == DHCP_OFFER)/* && ((dhcp->state == DHCP_SELECTING) || ( dhcp->state == DHCP_OFF ) || (dhcp->state == DHCP_BOUND) )*/) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
      dhcp->request_timeout = 0;
      /* remember offered lease */
      dhcp_handle_offer(netif);
    }
  free_pbuf_and_return:
    dhcp->msg_in = NULL;
    pbuf_free(p);
  }
  
  /**
   * Create a DHCP request, fill in common headers
   *
   * @param netif the netif under DHCP control
   * @param dhcp dhcp control struct
   * @param message_type message type of the request
   */
  static err_t
  dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
  {
    u16_t i;
  #ifndef DHCP_GLOBAL_XID
    /** default global transaction identifier starting value (easy to match
     *  with a packet analyser). We simply increment for each new request.
     *  Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
     *  at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
    static u32_t xid = 0xABCD0000;
  #else
    static u32_t xid;
    static u8_t xid_initialised = 0;
    if (!xid_initialised) {
      xid = DHCP_GLOBAL_XID;
      xid_initialised = !xid_initialised;
    }
  #endif
    LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
    LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
    LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
    LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
    dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
    if (dhcp->p_out == NULL) {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
        ("dhcp_create_msg(): could not allocate pbuf\n"));
      return ERR_MEM;
    }
    LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
             (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
  
    /* reuse transaction identifier in retransmissions */
    if (dhcp->tries == 0) {
        xid++;
    }
    dhcp->xid = xid;
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
                ("transaction id xid(%"X32_F")\n", xid));
  
    dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
  
    dhcp->msg_out->op = DHCP_BOOTREQUEST;
    /* TODO: make link layer independent */
    dhcp->msg_out->htype = DHCP_HTYPE_ETH;
    dhcp->msg_out->hlen = netif->hwaddr_len;
    dhcp->msg_out->hops = 0;
    dhcp->msg_out->xid = htonl(dhcp->xid);
    dhcp->msg_out->secs = 0;
    /* we don't need the broadcast flag since we can receive unicast traffic
       before being fully configured! */
    dhcp->msg_out->flags = 0;
    ip_addr_set_zero(&dhcp->msg_out->ciaddr);
    /* set ciaddr to netif->ip_addr based on message_type and state */
    if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
        ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
         ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
      ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
    }
    ip_addr_set_zero(&dhcp->msg_out->yiaddr);
    ip_addr_set_zero(&dhcp->msg_out->siaddr);
    ip_addr_set_zero(&dhcp->msg_out->giaddr);
    for (i = 0; i < DHCP_CHADDR_LEN; i++) {
      /* copy netif hardware address, pad with zeroes */
      dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
    }
    for (i = 0; i < DHCP_SNAME_LEN; i++) {
      dhcp->msg_out->sname[i] = 0;
    }
    for (i = 0; i < DHCP_FILE_LEN; i++) {
      dhcp->msg_out->file[i] = 0;
    }
    dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
    dhcp->options_out_len = 0;
    /* fill options field with an incrementing array (for debugging purposes) */
    for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
      dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
    }
    /* Add option MESSAGE_TYPE */
    dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
    dhcp_option_byte(dhcp, message_type);
    return ERR_OK;
  }
  
  /**
   * Free previously allocated memory used to send a DHCP request.
   *
   * @param dhcp the dhcp struct to free the request from
   */
  static void
  dhcp_delete_msg(struct dhcp *dhcp)
  {
    LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
    LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
    LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
    if (dhcp->p_out != NULL) {
      pbuf_free(dhcp->p_out);
    }
    dhcp->p_out = NULL;
    dhcp->msg_out = NULL;
  }
  
  /**
   * Add a DHCP message trailer
   *
   * Adds the END option to the DHCP message, and if
   * necessary, up to three padding bytes.
   *
   * @param dhcp DHCP state structure
   */
  static void
  dhcp_option_trailer(struct dhcp *dhcp)
  {
    LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
    LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
    LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
    dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
    /* packet is too small, or not 4 byte aligned? */
    while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
      /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
      LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
      /* add a fill/padding byte */
      dhcp->msg_out->options[dhcp->options_out_len++] = 0;
    }
  }
  
  //#endif /* LWIP_DHCP */
  