contiki/cpu/native/net/wpcap.c
2009-08-13 18:41:00 +00:00

350 lines
11 KiB
C

/*
* 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>
*
* $Id: wpcap.c,v 1.18 2009/08/13 18:41:00 dak664 Exp $
*/
#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
/* Avoid 'conflicting types' errors. */
#define htonl
#define htons
#include "contiki-net.h"
#include "sys/log.h"
#include "net/wpcap.h"
#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_ethaddr 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_ethaddr;
#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 BUF ((struct uip_eth_hdr *)&uip_buf[0])
#define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
/*---------------------------------------------------------------------------*/
static void
error_exit(char *message)
{
printf("error_exit: %s", message);
exit(EXIT_FAILURE);
}
/*---------------------------------------------------------------------------*/
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);
}
// pcap_setdirection(PCAP_D_IN); //Not implemented in windows yet?
return;
}
}
}
}
interfaces = interfaces->next;
}
if(interfaces == NULL) {
error_exit("no interface found with specified ip address\n");
}
}
/*---------------------------------------------------------------------------*/
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_ethaddr.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");
}
}
/*---------------------------------------------------------------------------*/
void
wpcap_init(void)
{
struct in_addr addr;
#ifdef __CYGWIN__
addr.s_addr = inet_addr((*__argv)[1]);
#else /* __CYGWIN__ */
addr.s_addr = inet_addr(__argv[1]);
#endif /* __CYGWIN__ */
if(addr.s_addr == INADDR_NONE) {
// error_exit("usage: <program> <ip addr of ethernet card to share>\n");
addr.s_addr = inet_addr("10.10.10.10");
log_message("usage: <program> <ip addr of ethernet card to share>\n-->I'll try guessing ", inet_ntoa(addr));
} else {
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);
set_ethaddr(addr);
}
/*---------------------------------------------------------------------------*/
u16_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("Discarding echoed packet\n");
return 0;
}
#endif /* UIP_CONF_IPV6 */
if(packet_header->caplen > UIP_BUFSIZE) {
return 0;
}
CopyMemory(uip_buf, packet, packet_header->caplen);
return (u16_t)packet_header->caplen;
}
/*---------------------------------------------------------------------------*/
#if UIP_CONF_IPV6
u8_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 {
memcpy(&BUF->dest, lladdr, UIP_LLADDR_LEN);
}
memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_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 = 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;
}
#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);
}
/*---------------------------------------------------------------------------*/