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contiki/cpu/native/net/wpcap.c

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/*
* 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 NETSTACK_CONF_WITH_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 /* NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_IPV6
struct in_addr6 addrfall6;
#endif
/*---------------------------------------------------------------------------*/
static void
init(void)
{
/* Nothing to do here */
}
/*---------------------------------------------------------------------------*/
uint8_t wfall_send(const 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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 /* NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 /* NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 /* NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_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 /* NETSTACK_CONF_WITH_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 NETSTACK_CONF_WITH_IPV6
uint8_t
wpcap_send(const 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(const 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 /* NETSTACK_CONF_WITH_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 /* NETSTACK_CONF_WITH_IPV6 */
/*---------------------------------------------------------------------------*/
void
wpcap_exit(void)
{
FreeLibrary(wpcap);
}
/*---------------------------------------------------------------------------*/
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