350 lines
11 KiB
C
350 lines
11 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Oliver Schmidt <ol.sc@web.de>
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*
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* $Id: wpcap.c,v 1.18 2009/08/13 18:41:00 dak664 Exp $
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*/
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#define WIN32_LEAN_AND_MEAN
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#define _WIN32_WINNT 0x0501
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#include <windows.h>
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#include <winsock2.h>
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#include <iphlpapi.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef __CYGWIN__
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#include <alloca.h>
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#else /* __CYGWIN__ */
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#include <malloc.h>
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#endif /* __CYGWIN__ */
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/* Avoid 'conflicting types' errors. */
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#define htonl
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#define htons
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#include "contiki-net.h"
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#include "sys/log.h"
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#include "net/wpcap.h"
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#ifdef __CYGWIN__
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__attribute__((dllimport)) extern char **__argv[];
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#endif /* __CYGWIN__ */
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struct pcap;
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struct pcap_if {
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struct pcap_if *next;
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char *name;
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char *description;
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struct pcap_addr {
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struct pcap_addr *next;
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struct sockaddr *addr;
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struct sockaddr *netmask;
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struct sockaddr *broadaddr;
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struct sockaddr *dstaddr;
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} *addresses;
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DWORD flags;
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};
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struct pcap_pkthdr {
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struct timeval ts;
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DWORD caplen;
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DWORD len;
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};
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HMODULE wpcap;
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static struct pcap *pcap;
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/* uip_ethaddr is defined in uip.c. It is not used in uip6.c.
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* If needed for some purpose it can be defined here
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*/
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#if UIP_CONF_IPV6
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//struct uip_eth_addr uip_ethaddr;
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#endif
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static int (* pcap_findalldevs)(struct pcap_if **, char *);
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static struct pcap *(* pcap_open_live)(char *, int, int, int, char *);
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static int (* pcap_next_ex)(struct pcap *, struct pcap_pkthdr **, unsigned char **);
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static int (* pcap_sendpacket)(struct pcap *, unsigned char *, int);
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#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
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#define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
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/*---------------------------------------------------------------------------*/
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static void
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error_exit(char *message)
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{
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printf("error_exit: %s", message);
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exit(EXIT_FAILURE);
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}
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/*---------------------------------------------------------------------------*/
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static void
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init_pcap(struct in_addr addr)
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{
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struct pcap_if *interfaces;
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struct pcap_addr *paddr;
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char error[256];
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if(pcap_findalldevs(&interfaces, error) == -1) {
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error_exit(error);
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}
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while(interfaces != NULL) {
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log_message("init_pcap: found interface: ", interfaces->description);
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if(interfaces->addresses != NULL) {
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for(paddr = interfaces->addresses;
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paddr != NULL;
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paddr = paddr->next) {
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if(paddr->addr != NULL && paddr->addr->sa_family == AF_INET) {
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struct in_addr interface_addr;
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interface_addr = ((struct sockaddr_in *)paddr->addr)->sin_addr;
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log_message("init_pcap: with address: ", inet_ntoa(interface_addr));
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if(interface_addr.s_addr == addr.s_addr) {
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pcap = pcap_open_live(interfaces->name, UIP_BUFSIZE, 0, -1, error);
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if(pcap == NULL) {
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error_exit(error);
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}
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// pcap_setdirection(PCAP_D_IN); //Not implemented in windows yet?
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return;
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}
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}
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}
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}
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interfaces = interfaces->next;
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}
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if(interfaces == NULL) {
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error_exit("no interface found with specified ip address\n");
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_ethaddr(struct in_addr addr)
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{
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PIP_ADAPTER_ADDRESSES adapters;
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ULONG size = 0;
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if(GetAdaptersAddresses(AF_INET, GAA_FLAG_SKIP_ANYCAST |
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GAA_FLAG_SKIP_MULTICAST |
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GAA_FLAG_SKIP_DNS_SERVER,
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NULL, NULL, &size) != ERROR_BUFFER_OVERFLOW) {
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error_exit("error on access to adapter list size\n");
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}
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adapters = alloca(size);
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if(GetAdaptersAddresses(AF_INET, GAA_FLAG_SKIP_ANYCAST |
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GAA_FLAG_SKIP_MULTICAST |
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GAA_FLAG_SKIP_DNS_SERVER,
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NULL, adapters, &size) != ERROR_SUCCESS) {
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error_exit("error on access to adapter list\n");
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}
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while(adapters != NULL) {
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char buffer[256];
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WideCharToMultiByte(CP_ACP, 0, adapters->Description, -1,
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buffer, sizeof(buffer), NULL, NULL);
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log_message("set_ethaddr: found adapter: ", buffer);
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if(adapters->FirstUnicastAddress != NULL &&
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adapters->FirstUnicastAddress->Address.lpSockaddr != NULL &&
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adapters->FirstUnicastAddress->Address.lpSockaddr->sa_family == AF_INET) {
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struct in_addr adapter_addr;
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adapter_addr = ((struct sockaddr_in *)adapters->FirstUnicastAddress->Address.lpSockaddr)->sin_addr;
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log_message("set_ethaddr: with address: ", inet_ntoa(adapter_addr));
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if(adapter_addr.s_addr == addr.s_addr) {
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if(adapters->PhysicalAddressLength != 6) {
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error_exit("ip addr specified on cmdline does not belong to an ethernet card\n");
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}
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wsprintf(buffer, "%02X-%02X-%02X-%02X-%02X-%02X",
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adapters->PhysicalAddress[0], adapters->PhysicalAddress[1],
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adapters->PhysicalAddress[2], adapters->PhysicalAddress[3],
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adapters->PhysicalAddress[4], adapters->PhysicalAddress[5]);
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log_message("set_ethaddr: ethernetaddr: ", buffer);
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#if UIP_CONF_IPV6
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// int i;for (i=0;i<6;i++) uip_ethaddr.addr[i] = adapters->PhysicalAddress[i];
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#else
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uip_setethaddr((*(struct uip_eth_addr *)adapters->PhysicalAddress));
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#endif
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break;
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}
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}
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adapters = adapters->Next;
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}
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if(adapters == NULL) {
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error_exit("no adapter found with ip addr specified on cmdline\n");
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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wpcap_init(void)
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{
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struct in_addr addr;
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#ifdef __CYGWIN__
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addr.s_addr = inet_addr((*__argv)[1]);
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#else /* __CYGWIN__ */
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addr.s_addr = inet_addr(__argv[1]);
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#endif /* __CYGWIN__ */
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if(addr.s_addr == INADDR_NONE) {
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// error_exit("usage: <program> <ip addr of ethernet card to share>\n");
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addr.s_addr = inet_addr("10.10.10.10");
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log_message("usage: <program> <ip addr of ethernet card to share>\n-->I'll try guessing ", inet_ntoa(addr));
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} else {
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log_message("wpcap_init:cmdline address: ", inet_ntoa(addr));
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}
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wpcap = LoadLibrary("wpcap.dll");
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pcap_findalldevs = (int (*)(struct pcap_if **, char *))
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GetProcAddress(wpcap, "pcap_findalldevs");
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pcap_open_live = (struct pcap *(*)(char *, int, int, int, char *))
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GetProcAddress(wpcap, "pcap_open_live");
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pcap_next_ex = (int (*)(struct pcap *, struct pcap_pkthdr **, unsigned char **))
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GetProcAddress(wpcap, "pcap_next_ex");
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pcap_sendpacket = (int (*)(struct pcap *, unsigned char *, int))
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GetProcAddress(wpcap, "pcap_sendpacket");
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if(pcap_findalldevs == NULL || pcap_open_live == NULL ||
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pcap_next_ex == NULL || pcap_sendpacket == NULL) {
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error_exit("error on access to winpcap library\n");
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}
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init_pcap(addr);
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set_ethaddr(addr);
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}
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/*---------------------------------------------------------------------------*/
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u16_t
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wpcap_poll(void)
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{
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struct pcap_pkthdr *packet_header;
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unsigned char *packet;
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switch(pcap_next_ex(pcap, &packet_header, &packet)) {
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case -1:
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error_exit("error on poll\n");
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case 0:
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return 0;
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}
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#if UIP_CONF_IPV6
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/* Since pcap_setdirection(PCAP_D_IN) is not implemented in winpcap all outgoing packets
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* will be echoed back. The stack will ignore any packets not addressed to it, but initial
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* ipv6 neighbor solicitations are addressed to everyone and the echoed NS sent on startup
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* would be processed as a conflicting NS race which would cause a stack shutdown.
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* So discard all packets with our source address (packet starts destaddr, srcaddr, ...)
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*
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*/
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int i;
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for (i=0;i<UIP_LLADDR_LEN;i++) if (*(packet+UIP_LLADDR_LEN+i)!=uip_lladdr.addr[i]) break;
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if (i==UIP_LLADDR_LEN) {
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PRINTF("Discarding echoed packet\n");
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return 0;
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}
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#endif /* UIP_CONF_IPV6 */
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if(packet_header->caplen > UIP_BUFSIZE) {
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return 0;
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}
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CopyMemory(uip_buf, packet, packet_header->caplen);
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return (u16_t)packet_header->caplen;
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}
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/*---------------------------------------------------------------------------*/
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#if UIP_CONF_IPV6
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u8_t
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wpcap_send(uip_lladdr_t *lladdr)
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{
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if(lladdr == NULL) {
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/* the dest must be multicast*/
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(&BUF->dest)->addr[0] = 0x33;
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(&BUF->dest)->addr[1] = 0x33;
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(&BUF->dest)->addr[2] = IPBUF->destipaddr.u8[12];
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(&BUF->dest)->addr[3] = IPBUF->destipaddr.u8[13];
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(&BUF->dest)->addr[4] = IPBUF->destipaddr.u8[14];
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(&BUF->dest)->addr[5] = IPBUF->destipaddr.u8[15];
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} else {
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memcpy(&BUF->dest, lladdr, UIP_LLADDR_LEN);
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}
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memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_LEN);
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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]);
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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]);
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PRINTF(" Type=%04x\n",BUF->type);
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BUF->type = HTONS(UIP_ETHTYPE_IPV6);
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uip_len += sizeof(struct uip_eth_hdr);
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if(pcap_sendpacket(pcap, uip_buf, uip_len) == -1) {
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error_exit("error on send\n");
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}
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return 0;
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}
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#else /* UIP_CONF_IPV6 */
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void
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wpcap_send(void)
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{
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/* if(rand() % 1000 > 900) {
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printf("Drop\n");
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return;
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} else {
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printf("Send\n");
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}*/
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if(pcap_sendpacket(pcap, uip_buf, uip_len) == -1) {
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error_exit("error on send\n");
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}
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}
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#endif /* UIP_CONF_IPV6 */
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/*---------------------------------------------------------------------------*/
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void
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wpcap_exit(void)
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{
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FreeLibrary(wpcap);
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}
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/*---------------------------------------------------------------------------*/
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