text: /*
   * Copyright (c) 2007, Swedish Institute of Computer Science.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the Institute nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * This file is part of the Contiki operating system.
   *
   * Author: Oliver Schmidt <ol.sc@web.de>
   *
   */
  
  #define WIN32_LEAN_AND_MEAN
  #define _WIN32_WINNT 0x0501
  #include <windows.h>
  #include <winsock2.h>
  #include <iphlpapi.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #ifdef __CYGWIN__
  #include <alloca.h>
  #else /* __CYGWIN__ */
  #include <malloc.h>
  #endif /* __CYGWIN__ */
  
  #define DEBUG 0
  #if DEBUG
  #define PRINTF(...) printf(__VA_ARGS__)
  #else
  #define PRINTF(...)
  #endif
  
  #include "contiki-net.h"
  #include "sys/log.h"
  
  #include "net/wpcap.h"
  
  /* Handle native-border-router case where the fallback has ethernet headers.
   * The command line args for native-border-router conflice with the passing
   * of the interface addresses to connect to, so both must be hard coded.
   * See comments in wpcap-drv.c
   */
  #ifdef SELECT_CALLBACK
  #define FALLBACK_HAS_ETHERNET_HEADERS  1
  #endif
  
  #if UIP_CONF_IPV6
  #include <ws2tcpip.h>
  struct in6_addr addr6;
  char addr6str[64];
  /*---------------------------------------------------------------------------*/
  uint8_t
  issame_ip6addr(struct in6_addr addr1, struct in6_addr addr2)
  {
   return ((addr1.s6_addr32[0]==addr2.s6_addr32[0]) &&
  		 (addr1.s6_addr32[1]==addr2.s6_addr32[1]) &&
  		 (addr1.s6_addr32[2]==addr2.s6_addr32[2]) &&
  		 (addr1.s6_addr32[3]==addr2.s6_addr32[3]) );
  }
  /*---------------------------------------------------------------------------*/
  uint8_t
  iszero_ip6addr(struct in6_addr addr)
  {
   return ((addr.s6_addr32[0]==0) &&
  		 (addr.s6_addr32[1]==0) &&
  		 (addr.s6_addr32[2]==0) &&
  		 (addr.s6_addr32[3]==0) );
  }
  /*---------------------------------------------------------------------------*/
  uint8_t
  sprint_ip6addr(struct in6_addr addr, char * result)
  {
    unsigned char i = 0;
    unsigned char zerocnt = 0;
    unsigned char numprinted = 0;
    char * starting = result;
  
    *result++='[';
    while (numprinted < 8) {
      if ((addr.s6_addr16[i] == 0) && (zerocnt == 0)) {
        while(addr.s6_addr16[zerocnt + i] == 0) zerocnt++;
        if (zerocnt == 1) {
          *result++ = '0';
           numprinted++;
           break;
        }
        i += zerocnt;
        numprinted += zerocnt;
      } else {
        result += sprintf(result, "%x", (unsigned int) uip_ntohs(addr.s6_addr16[i]));
        i++;
        numprinted++;
      }
      if (numprinted != 8) *result++ = ':';
    }
    *result++=']';
    *result=0;
    return (result - starting);
  }
  
  #endif /* UIP_CONF_IPV6 */
  
  
  #ifdef __CYGWIN__
  __attribute__((dllimport)) extern char **__argv[];
  #endif /* __CYGWIN__ */
  
  struct pcap;
  
  struct pcap_if {
    struct pcap_if *next;
    char *name;
    char *description;
    struct pcap_addr {
      struct pcap_addr *next;
      struct sockaddr *addr;
      struct sockaddr *netmask;
      struct sockaddr *broadaddr;
      struct sockaddr *dstaddr;
    } *addresses;
    DWORD flags;
  };
  
  struct pcap_pkthdr {
    struct timeval ts;
    DWORD caplen;
    DWORD len;
  };
  
  HMODULE wpcap;
  
  static struct pcap *pcap;
  
  /* uip_lladdr is defined in uip.c. It is not used in uip6.c. 
   * If needed for some purpose it can be defined here
   */
  #if UIP_CONF_IPV6
  //struct uip_eth_addr uip_lladdr;
  #endif
  
  static int (* pcap_findalldevs)(struct pcap_if **, char *);
  static struct pcap *(* pcap_open_live)(char *, int, int, int, char *);
  static int (* pcap_next_ex)(struct pcap *, struct pcap_pkthdr **, unsigned char **);
  static int (* pcap_sendpacket)(struct pcap *, unsigned char *, int);
  
  #define UIP_IP_BUF        ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
  #define BUF ((struct uip_eth_hdr *)&uip_buf[0])
  #define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
  
  #ifdef UIP_FALLBACK_INTERFACE
  static struct pcap *pfall;
  struct in_addr addrfall;
  #if UIP_CONF_IPV6
  struct in_addr6 addrfall6;
  #endif
  
  /*---------------------------------------------------------------------------*/
  static void
  init(void)
  {
  /* Nothing to do here */
  }
  /*---------------------------------------------------------------------------*/
  uint8_t wfall_send(uip_lladdr_t *lladdr);
  #if FALLBACK_HAS_ETHERNET_HEADERS
  #undef IPBUF
  #define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[14])
  static uip_ipaddr_t last_sender;
  #endif
  
  static void
  output(void)
  {
  #if FALLBACK_HAS_ETHERNET_HEADERS&&0
    if(uip_ipaddr_cmp(&last_sender, &UIP_IP_BUF->srcipaddr)) {
      /* Do not bounce packets back to fallback if the packet was received from it */
      PRINTF("FUT: trapping pingpong");
  	return;
    }
    uip_ipaddr_copy(&last_sender, &UIP_IP_BUF->srcipaddr);
  #endif
      PRINTF("FUT: %u\n", uip_len);
  	wfall_send(0);
  }
  
  const struct uip_fallback_interface rpl_interface = {
    init, output
  };
  
  #endif
  
  /*---------------------------------------------------------------------------*/
  static void
  error_exit(char *message)
  {
    printf("error_exit: %s", message);
    exit(EXIT_FAILURE);
  }
  /*---------------------------------------------------------------------------*/
  static void
  set_ethaddr(struct in_addr addr)
  {
    PIP_ADAPTER_ADDRESSES adapters;
    ULONG size = 0;
  
    if(GetAdaptersAddresses(AF_INET, GAA_FLAG_SKIP_ANYCAST |
                                     GAA_FLAG_SKIP_MULTICAST |
                                     GAA_FLAG_SKIP_DNS_SERVER,
                            NULL, NULL, &size) != ERROR_BUFFER_OVERFLOW) {
      error_exit("error on access to adapter list size\n");
    }
    adapters = alloca(size);
    if(GetAdaptersAddresses(AF_INET, GAA_FLAG_SKIP_ANYCAST |
                                     GAA_FLAG_SKIP_MULTICAST |
                                     GAA_FLAG_SKIP_DNS_SERVER,
                            NULL, adapters, &size) != ERROR_SUCCESS) {
      error_exit("error on access to adapter list\n");
    }
  
    while(adapters != NULL) {
  
      char buffer[256];
      WideCharToMultiByte(CP_ACP, 0, adapters->Description, -1,
         buffer, sizeof(buffer), NULL, NULL);
      log_message("set_ethaddr: found adapter: ", buffer);
  
      if(adapters->FirstUnicastAddress != NULL &&
         adapters->FirstUnicastAddress->Address.lpSockaddr != NULL &&
         adapters->FirstUnicastAddress->Address.lpSockaddr->sa_family == AF_INET) {
  
        struct in_addr adapter_addr;
        adapter_addr = ((struct sockaddr_in *)adapters->FirstUnicastAddress->Address.lpSockaddr)->sin_addr;
        log_message("set_ethaddr:  with address: ", inet_ntoa(adapter_addr));
  
        if(adapter_addr.s_addr == addr.s_addr) {
          if(adapters->PhysicalAddressLength != 6) {
            error_exit("ip addr specified on cmdline does not belong to an ethernet card\n");
          }
          wsprintf(buffer, "%02X-%02X-%02X-%02X-%02X-%02X",
            adapters->PhysicalAddress[0], adapters->PhysicalAddress[1],
            adapters->PhysicalAddress[2], adapters->PhysicalAddress[3],
            adapters->PhysicalAddress[4], adapters->PhysicalAddress[5]);
          log_message("set_ethaddr:  ethernetaddr: ", buffer);
  #if UIP_CONF_IPV6
  //      int i;for (i=0;i<6;i++) uip_lladdr.addr[i] = adapters->PhysicalAddress[i];
  #else
          uip_setethaddr((*(struct uip_eth_addr *)adapters->PhysicalAddress));
  #endif
          break;
        }
      }
      adapters = adapters->Next;
    }
  
    if(adapters == NULL) {
      error_exit("no adapter found with ip addr specified on cmdline\n");
    }
  }
  
  #if UIP_CONF_IPV6
  /*---------------------------------------------------------------------------*/
  static void
  set_ethaddr6(struct in_addr6 addr)
  {
    PIP_ADAPTER_ADDRESSES adapters;
    ULONG size = 0;
  
    if(GetAdaptersAddresses(AF_INET6, GAA_FLAG_SKIP_ANYCAST |
                                     GAA_FLAG_SKIP_MULTICAST |
                                     GAA_FLAG_SKIP_DNS_SERVER,
                            NULL, NULL, &size) != ERROR_BUFFER_OVERFLOW) {
      error_exit("error on access to adapter list size\n");
    }
    adapters = alloca(size);
    if(GetAdaptersAddresses(AF_INET6, GAA_FLAG_SKIP_ANYCAST |
                                     GAA_FLAG_SKIP_MULTICAST |
                                     GAA_FLAG_SKIP_DNS_SERVER,
                            NULL, adapters, &size) != ERROR_SUCCESS) {
      error_exit("error on access to adapter list\n");
    }
  
    while(adapters != NULL) {
  
      char buffer[256];
      WideCharToMultiByte(CP_ACP, 0, adapters->Description, -1,
         buffer, sizeof(buffer), NULL, NULL);
      log_message("set_ethaddr: found adapter: ", buffer);
  
      if(adapters->FirstUnicastAddress != NULL &&
         adapters->FirstUnicastAddress->Address.lpSockaddr != NULL &&
         adapters->FirstUnicastAddress->Address.lpSockaddr->sa_family == AF_INET6) {
  
        struct in_addr6 adapter_addr;
        adapter_addr = ((struct sockaddr_in6 *)adapters->FirstUnicastAddress->Address.lpSockaddr)->sin6_addr;
  	  sprint_ip6addr(adapter_addr, addr6str);
        log_message("set_ethaddr:  with ipv6 address: : ", addr6str);
  	  if(issame_ip6addr(adapter_addr,addr6)) {
          if(adapters->PhysicalAddressLength != 6) {
            error_exit("ip addr specified on cmdline does not belong to an ethernet card\n");
          }
          wsprintf(buffer, "%02X-%02X-%02X-%02X-%02X-%02X",
            adapters->PhysicalAddress[0], adapters->PhysicalAddress[1],
            adapters->PhysicalAddress[2], adapters->PhysicalAddress[3],
            adapters->PhysicalAddress[4], adapters->PhysicalAddress[5]);
          log_message("set_ethaddr:  ethernetaddr: ", buffer);
  #if UIP_CONF_IPV6
  //      int i;for (i=0;i<6;i++) uip_lladdr.addr[i] = adapters->PhysicalAddress[i]; //does this need doing?
  #else
          uip_setethaddr((*(struct uip_eth_addr *)adapters->PhysicalAddress));
  #endif
          break;
        }
      }
      adapters = adapters->Next;
    }
  
    if(adapters == NULL) {
      error_exit("no adapter found with ip addr specified on cmdline\n");
    }
  }
  #endif
  /*---------------------------------------------------------------------------*/
  static void
  init_pcap(struct in_addr addr)
  {
    struct pcap_if *interfaces;
    struct pcap_addr *paddr;
    char error[256];
   
   if(pcap_findalldevs(&interfaces, error) == -1) {
      error_exit(error);
    }
  
    while(interfaces != NULL) {
      log_message("init_pcap: found interface: ", interfaces->description);
  
      if(interfaces->addresses != NULL) {
        for(paddr = interfaces->addresses;
          paddr != NULL;
          paddr = paddr->next) {
           if(paddr->addr != NULL && paddr->addr->sa_family == AF_INET) {
            struct in_addr interface_addr;
            interface_addr = ((struct sockaddr_in *)paddr->addr)->sin_addr;
            log_message("init_pcap:    with address: ", inet_ntoa(interface_addr));
  
            if(interface_addr.s_addr == addr.s_addr) {
              pcap = pcap_open_live(interfaces->name, UIP_BUFSIZE, 0, -1, error);
              if(pcap == NULL) {
                error_exit(error);
              }
  #ifdef UIP_FALLBACK_INTERFACE
  			log_message("init_pcap:      Opened as primary interface","");
  #else
  			log_message("init_pcap:      Opened as interface","");
  #endif
  //          pcap_setdirection(PCAP_D_IN);  //Not implemented in windows yet?
  			set_ethaddr(addr);
  
  #ifdef UIP_FALLBACK_INTERFACE
            }
            if (pfall && pcap) return;
            if(interface_addr.s_addr == addrfall.s_addr) {
              pfall = pcap_open_live(interfaces->name, UIP_BUFSIZE, 0, -1, error);
              if(pfall == NULL) {
                error_exit(error);
              }
  			log_message("init_pcap:      Opened as fallback interface","");
  			if (pcap) return;
  	      }
  #else
              return;
  		  }
  #endif
  
  #if UIP_CONF_IPV6
  
          } else if(paddr->addr != NULL && paddr->addr->sa_family == AF_INET6) {
  		  struct in6_addr interface_addr;
            interface_addr = ((struct sockaddr_in6 *)paddr->addr)->sin6_addr;
  
  		  sprint_ip6addr(interface_addr, addr6str);
            log_message("init_pcap:    with ipv6 address: ", addr6str);
  
  		  if (issame_ip6addr(interface_addr, addr6)) {
              pcap = pcap_open_live(interfaces->name, UIP_BUFSIZE, 0, -1, error);
              if(pcap == NULL) {
                error_exit(error);
              }
  #ifdef UIP_FALLBACK_INTERFACE
  			log_message("init_pcap:      Opened as primary interface","");
  #endif
              set_ethaddr6(addr6);
  //          pcap_setdirection(PCAP_D_IN);  //Not implemented in windows yet?
  #ifdef UIP_FALLBACK_INTERFACE
            }
            if (pfall && pcap) return;  //exit when we have both interfaces
  
  		  if (issame_ip6addr(interface_addr, addrfall6)) {
              pfall = pcap_open_live(interfaces->name, UIP_BUFSIZE, 0, -1, error);
              if(pfall == NULL) {
                error_exit(error);
              }
  			log_message("init_pcap:      Opened as fallback interface","");
  			if (pcap) return;
  	      }
  #else
              return;
  		  }
  #endif
  #endif /* UIP_CONF_IPV6 */
  		}
        }
      }
      interfaces = interfaces->next;
  
    }
  
    if(interfaces == NULL) {
      error_exit("no interface found with specified ip address\n");
    }
  }
  /*---------------------------------------------------------------------------*/
  void
  wpcap_init(void)
  {
    struct in_addr addr;
    addr.s_addr = INADDR_NONE;  //255.255.255.255
  #ifdef UIP_FALLBACK_INTERFACE
    addrfall.s_addr = INADDR_NONE;
  #endif
  
    /* Pick up possible ip addresses from command line */
  #ifdef __CYGWIN__
    if ((*__argv)[1]) {
      addr.s_addr = inet_addr((*__argv)[1]);
  #if UIP_CONF_IPV6
      uiplib_ipaddrconv((*__argv)[1],(uip_ipaddr_t*) &addr6.s6_addr);
  #endif
  #ifdef UIP_FALLBACK_INTERFACE
      if ((*__argv)[2]) {
        addrfall.s_addr = inet_addr((*__argv)[2]);
  #if UIP_CONF_IPV6
        uiplib_ipaddrconv((*__argv)[2],(uip_ipaddr_t*) &addrfall6.s6_addr);
  #endif
      }
  #endif
    }
  
  #else /* __CYGWIN__ */
  /* VC++ build on win32 platform. Currently the platform has no ipv6 support */
    addr.s_addr = inet_addr(__argv[1]);
  #if UIP_CONF_IPV6
    if((__argv)[1])
    uiplib_ipaddrconv((__argv)[1],(uip_ipaddr_t*) &addr6.s6_addr);
  #endif
  #ifdef UIP_FALLBACK_INTERFACE
    addrfall.s_addr = inet_addr(__argv[2]);
  #if UIP_CONF_IPV6
    if((__argv)[2])
    uiplib_ipaddrconv((__argv)[2],(uip_ipaddr_t*) &addrfall6.s6_addr);
  #endif
  #endif
  #endif /* __CYGWIN__ */
  
  #if DEBUG
    log_message("wpcap_init:Passed ipv4 ", inet_ntoa(addr));
    sprint_ip6addr(addr6, addr6str);
    log_message("wpcap_init:Passed ipv6 ", addr6str);
  #ifdef UIP_FALLBACK_INTERFACE
    log_message("wpcap_init:Passed fallback ipv4 ", inet_ntoa(addrfall));
    sprint_ip6addr(addrfall6, addr6str);
    log_message("wpcap_init:Passed fallback ipv6 ", addr6str);
  #endif
  #endif
  
    /* Use build defaults if not enough addresses passed */
  #if UIP_CONF_IPV6
  
  #ifdef UIP_FALLBACK_INTERFACE
    if(addrfall.s_addr == INADDR_NONE) {
  	if(iszero_ip6addr(addrfall6)) {
  #ifdef WPCAP_FALLBACK_ADDRESS
        addrfall.s_addr = inet_addr(WPCAP_FALLBACK_ADDRESS);
  //	  if(addrfall.s_addr == INADDR_NONE) {  //use ipv6 if contiki-conf.h override
          uiplib_ipaddrconv(WPCAP_FALLBACK_ADDRESS,(uip_ipaddr_t*) &addrfall6.s6_addr);
  //	  }
  #else
  //    addrfall.s_addr = inet_addr("10.2.10.10");
        uiplib_ipaddrconv("bbbb::1",(uip_ipaddr_t*) &addrfall6.s6_addr);
  #endif
      }
    }
  #endif
  
    if(addr.s_addr == INADDR_NONE) {
  	if(iszero_ip6addr(addr6)) {
  #ifdef WPCAP_INTERFACE_ADDRESS
        addr.s_addr = inet_addr(WPCAP_INTERFACE_ADDRESS);
  //	  if(addr.s_addr == INADDR_NONE) {
          uiplib_ipaddrconv(WPCAP_INTERFACE_ADDRESS,(uip_ipaddr_t*) &addr6.s6_addr);
  //	  }
  #else
        addr.s_addr = inet_addr("10.10.10.10");   //prefer ipv4 default for legacy compatibility
  //    uiplib_ipaddrconv("aaaa::1",(uip_ipaddr_t*) &addr6.s6_addr);
  #endif
  
  #ifdef UIP_FALLBACK_INTERFACE
        log_message("usage: <program> <ip addr of interface> <ip addr of fallback>\n","");
  	  if(addr.s_addr != INADDR_NONE) {
  		  log_message("-->I'll try interface address ", inet_ntoa(addr));
  	  } else {
  	    sprint_ip6addr(addr6, addr6str);
  	    log_message("-->I'll try interface address ", addr6str);
  	  }
  	  if(addrfall.s_addr != INADDR_NONE) {
  		  log_message("-->      and fallback address ", inet_ntoa(addrfall));
  	  } else {
  	    sprint_ip6addr(addrfall6, addr6str);
  	    log_message("-->      and fallback address ", addr6str);
  	  }
  #else
        if(addr.s_addr != INADDR_NONE) {
          log_message("usage: <program> <ip addr of ethernet card to share>\n-->I'll try guessing ", inet_ntoa(addr));
  	  } else {
  	    sprint_ip6addr(addr6, addr6str);
  	    log_message("usage: <program> <ip addr of ethernet card to share>\n-->I'll try guessing ", addr6str);
  	  }
  #endif
      }
    }
  #else /* ip4 build */
    if(addr.s_addr == INADDR_NONE) {
  #ifdef WPCAP_INTERFACE_ADDRESS
      addr.s_addr = inet_addr(WPCAP_INTERFACE_ADDRESS);
  #else
      addr.s_addr = inet_addr("10.10.10.10");
  #endif
      log_message("usage: <program> <ip addr of ethernet card to share>\n-->I'll try guessing ", inet_ntoa(addr));
    }
  #endif /* UIP_CONF_IPV6 */
  
  #if DEBUG
    log_message("wpcap_init:Using ipv4 ", inet_ntoa(addr));
    sprint_ip6addr(addr6, addr6str);
    log_message("wpcap_init:Using ipv6 ", addr6str);
  #ifdef UIP_FALLBACK_INTERFACE
    log_message("wpcap_init:Using fallback ipv4 ", inet_ntoa(addrfall));
    sprint_ip6addr(addrfall6, addr6str);
    log_message("wpcap_init:Using fallback ipv6 ", addr6str);
  #endif
  #endif
  
   //   log_message("wpcap_init:cmdline address: ", inet_ntoa(addr));
  
  
    wpcap = LoadLibrary("wpcap.dll");
    pcap_findalldevs = (int (*)(struct pcap_if **, char *))
                       GetProcAddress(wpcap, "pcap_findalldevs");
    pcap_open_live   = (struct pcap *(*)(char *, int, int, int, char *))
                       GetProcAddress(wpcap, "pcap_open_live");
    pcap_next_ex     = (int (*)(struct pcap *, struct pcap_pkthdr **, unsigned char **))
                       GetProcAddress(wpcap, "pcap_next_ex");
    pcap_sendpacket  = (int (*)(struct pcap *, unsigned char *, int))
                       GetProcAddress(wpcap, "pcap_sendpacket");
  
    if(pcap_findalldevs == NULL || pcap_open_live  == NULL ||
       pcap_next_ex     == NULL || pcap_sendpacket == NULL) {
      error_exit("error on access to winpcap library\n");
    }
  
      init_pcap(addr);
  
  }
  
  /*---------------------------------------------------------------------------*/
  uint16_t
  wpcap_poll(void)
  {
    struct pcap_pkthdr *packet_header;
    unsigned char *packet;
  
    switch(pcap_next_ex(pcap, &packet_header, &packet)) {
    case -1:
      error_exit("error on poll\n");
    case 0:
      return 0;
    }
  
  #if UIP_CONF_IPV6
  /* Since pcap_setdirection(PCAP_D_IN) is not implemented in winpcap all outgoing packets
   * will be echoed back. The stack will ignore any packets not addressed to it, but initial
   * ipv6 neighbor solicitations are addressed to everyone and the echoed NS sent on startup
   * would be processed as a conflicting NS race which would cause a stack shutdown.
   * So discard all packets with our source address (packet starts destaddr, srcaddr, ...)
   *
   */
    int i;
    for (i=0;i<UIP_LLADDR_LEN;i++) if (*(packet+UIP_LLADDR_LEN+i)!=uip_lladdr.addr[i]) break;
    if (i==UIP_LLADDR_LEN) {
      PRINTF("SIN: Discarding echoed packet\n");
      return 0;
    }
    
  /* To implement multihop, ignore packets to us from specified source macs
   */
  //  printf("ethtype=%x %x",*(packet+2*UIP_LLADDR_LEN),*(packet+2*UIP_LLADDR_LEN+1));
  // printf("hopcount=%u",*(packet+21));
  #if 0
    if (0
  //   || (*(packet+11) ==0x1)   //20 ignores router
  //  || (*(packet+11) ==0x10)
      || (*(packet+11) ==0x20)  //router ignores 20
    ) {
     printf("i%x",*(packet+11));
      return 0;
    }
  /* If we are not the recipient, ignore packets from other RPL nodes */
    if (0
      || (*(packet+5) !=0x1)   //router
  //  || (*(packet+11) ==0x10)
   //   || (*(packet+11) ==0x20)  //router ignores 20
    ) {
     printf("r%x",*(packet+11));
      return 0;
    }
  #endif
  
  #endif /* UIP_CONF_IPV6 */
  
    if(packet_header->caplen > UIP_BUFSIZE) {
      return 0;
    }
  //  PRINTF("SIN: %lu\n", packet_header->caplen);
    CopyMemory(uip_buf, packet, packet_header->caplen);
    return (uint16_t)packet_header->caplen;
  
  }
  
  #ifdef UIP_FALLBACK_INTERFACE
  uint16_t
  wfall_poll(void)
  {
    struct pcap_pkthdr *packet_header;
    unsigned char *packet;
  
    switch(pcap_next_ex(pfall, &packet_header, &packet)) {
    case -1:
      error_exit("error on fallback poll\n");
    case 0:
      return 0;
    }
  #if UIP_CONF_IPV6
  #if FALLBACK_HAS_ETHERNET_HEADERS
  #define ETHERNET_LLADDR_LEN 6
  #else
  #define ETHERNET_LLADDR_LEN UIP_LLADDR_LEN
  #endif
  /* Since pcap_setdirection(PCAP_D_IN) is not implemented in winpcap all outgoing packets
   * will be echoed back. The stack will ignore any packets not addressed to it, but initial
   * ipv6 neighbor solicitations are addressed to everyone and the echoed NS sent on startup
   * would be processed as a conflicting NS race which would cause a stack shutdown.
   * So discard all packets with our source address (packet starts destaddr, srcaddr, ...)
   *
   */
    int i;
    for (i=0;i<ETHERNET_LLADDR_LEN;i++) if (*(packet+ETHERNET_LLADDR_LEN+i)!=uip_lladdr.addr[i]) break;
    if (i==ETHERNET_LLADDR_LEN) {
      PRINTF("Discarding echoed packet\n");
      return 0;
    }
  #endif /* UIP_CONF_IPV6 */
  
    if(packet_header->caplen > UIP_BUFSIZE) {
      return 0;
    }
    PRINTF("FIN: %lu\n", packet_header->caplen);
    CopyMemory(uip_buf, packet, packet_header->caplen);
    return (uint16_t)packet_header->caplen;
  
  }
  
  #endif
  
  /*---------------------------------------------------------------------------*/
  #if UIP_CONF_IPV6
  uint8_t
  wpcap_send(uip_lladdr_t *lladdr)
  {
    if(lladdr == NULL) {
  /* the dest must be multicast*/
      (&BUF->dest)->addr[0] = 0x33;
      (&BUF->dest)->addr[1] = 0x33;
      (&BUF->dest)->addr[2] = IPBUF->destipaddr.u8[12];
      (&BUF->dest)->addr[3] = IPBUF->destipaddr.u8[13];
      (&BUF->dest)->addr[4] = IPBUF->destipaddr.u8[14];
      (&BUF->dest)->addr[5] = IPBUF->destipaddr.u8[15];
    } else {
     //when fallback used this gets ptr to lladdr of all zeroes on forwarded packets, turn them into multicast(?)
      if ((lladdr->addr[0]==0)&&(lladdr->addr[1]==0)&&(lladdr->addr[2]==0)&&(lladdr->addr[3]==0)&&(lladdr->addr[4]==0)&&(lladdr->addr[5]==0)) {
       (&BUF->dest)->addr[0] = 0x33;
       (&BUF->dest)->addr[1] = 0x33;
       (&BUF->dest)->addr[2] = IPBUF->destipaddr.u8[12];
       (&BUF->dest)->addr[3] = IPBUF->destipaddr.u8[13];
       (&BUF->dest)->addr[4] = IPBUF->destipaddr.u8[14];
       (&BUF->dest)->addr[5] = IPBUF->destipaddr.u8[15];
      } else {
        memcpy(&BUF->dest, lladdr, UIP_LLADDR_LEN);
      }
    }
    memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_LEN);
    PRINTF("SUT: %u\n", uip_len);
    PRINTF("Src= %02x %02x %02x %02x %02x %02x",(&BUF->src)->addr[0],(&BUF->src)->addr[1],(&BUF->src)->addr[2],(&BUF->src)->addr[3],(&BUF->src)->addr[4],(&BUF->src)->addr[5]);
    PRINTF("  Dst= %02x %02x %02x %02x %02x %02x",(&BUF->dest)->addr[0],(&BUF->dest)->addr[1],(&BUF->dest)->addr[2],(&BUF->dest)->addr[3],(&BUF->dest)->addr[4],(&BUF->dest)->addr[5]);
    PRINTF("  Type=%04x\n",BUF->type);
    BUF->type = UIP_HTONS(UIP_ETHTYPE_IPV6);
    uip_len += sizeof(struct uip_eth_hdr);
    if(pcap_sendpacket(pcap, uip_buf, uip_len) == -1) {
      error_exit("error on send\n");
    }
  return 0;
  }
  #ifdef UIP_FALLBACK_INTERFACE
  uint8_t
  wfall_send(uip_lladdr_t *lladdr)
  {
  #if FALLBACK_HAS_ETHERNET_HEADERS
  	//make room for ethernet header
  //{int i;printf("\n");for (i=0;i<uip_len;i++) printf("%02x ",*(char*)(uip_buf+i));printf("\n");}
  {int i;for(i=uip_len;i>=0;--i) *(char *)(uip_buf+i+14) = *(char *)(uip_buf+i);}
  //{int i;printf("\n");for (i=0;i<uip_len;i++) printf("%02x ",*(char*)(uip_buf+i));printf("\n");}
  #endif
    if(lladdr == NULL) {
  /* the dest must be multicast*/
      (&BUF->dest)->addr[0] = 0x33;
      (&BUF->dest)->addr[1] = 0x33;
      (&BUF->dest)->addr[2] = IPBUF->destipaddr.u8[12];
      (&BUF->dest)->addr[3] = IPBUF->destipaddr.u8[13];
      (&BUF->dest)->addr[4] = IPBUF->destipaddr.u8[14];
      (&BUF->dest)->addr[5] = IPBUF->destipaddr.u8[15];
    } else {
      memcpy(&BUF->dest, lladdr, UIP_LLADDR_LEN);
    }
    memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_LEN);
    PRINTF("FUT: %u\n", uip_len);
    PRINTF("Srcf= %02x %02x %02x %02x %02x %02x",(&BUF->src)->addr[0],(&BUF->src)->addr[1],(&BUF->src)->addr[2],(&BUF->src)->addr[3],(&BUF->src)->addr[4],(&BUF->src)->addr[5]);
    PRINTF("  Dstf= %02x %02x %02x %02x %02x %02x",(&BUF->dest)->addr[0],(&BUF->dest)->addr[1],(&BUF->dest)->addr[2],(&BUF->dest)->addr[3],(&BUF->dest)->addr[4],(&BUF->dest)->addr[5]);
    PRINTF("  Typef=%04x\n",BUF->type);
    BUF->type = UIP_HTONS(UIP_ETHTYPE_IPV6);
    uip_len += sizeof(struct uip_eth_hdr);
    if(pcap_sendpacket(pfall, uip_buf, uip_len) == -1) {
      error_exit("error on fallback send\n");
    }
  return 0;
  }
  #endif
  #else /* UIP_CONF_IPV6 */
  void
  wpcap_send(void)
  {
    /*  if(rand() % 1000 > 900) {
      printf("Drop\n");
      return;
    } else {
      printf("Send\n");
      }*/
  
    if(pcap_sendpacket(pcap, uip_buf, uip_len) == -1) {
      error_exit("error on send\n");
    }
  }
  #endif /* UIP_CONF_IPV6 */
  /*---------------------------------------------------------------------------*/
  void
  wpcap_exit(void)
  {
    FreeLibrary(wpcap);
  }
  /*---------------------------------------------------------------------------*/
  