235 lines
7.5 KiB
C
235 lines
7.5 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 1.1 2007/04/01 20:39:38 oliverschmidt 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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#define htons /* Avoid 'conflicting types' error. */
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#include "contiki-net.h"
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#include "wpcap.h"
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extern char **__argv[];
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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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uint32_t flags;
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};
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struct pcap_pkthdr {
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struct timeval ts;
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uint32_t caplen;
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uint32_t len;
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};
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static struct pcap *pcap;
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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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/*---------------------------------------------------------------------------*/
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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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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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printf("init_pcap: found interface: %s\n", interfaces->description);
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if(interfaces->addresses != NULL &&
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interfaces->addresses->addr != NULL &&
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interfaces->addresses->addr->sa_family == AF_INET) {
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struct in_addr interface_addr;
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interface_addr = ((struct sockaddr_in *)interfaces->addresses->addr)->sin_addr;
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printf("init_pcap: with address: %s\n", inet_ntoa(interface_addr));
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if(interface_addr.s_addr == addr.s_addr) {
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break;
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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 ip addr specified on cmdline\n");
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}
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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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}
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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 description[256];
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WideCharToMultiByte(CP_ACP, 0, adapters->Description, -1,
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description, sizeof(description), NULL, NULL);
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printf("set_ethaddr: found adapter: %s\n", description);
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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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printf("set_ethaddr: with address: %s\n", 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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printf("set_ethaddr: ethernetaddr: %02X-%02X-%02X-%02X-%02X-%02X\n",
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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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uip_setethaddr((*(struct uip_eth_addr *)adapters->PhysicalAddress));
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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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HMODULE wpcap;
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addr.s_addr = inet_addr((*__argv)[1]);
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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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}
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printf("wpcap_init: cmdline address: %s\n", inet_ntoa(addr));
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wpcap = LoadLibrary("wpcap.dll");
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(FARPROC)pcap_findalldevs = GetProcAddress(wpcap, "pcap_findalldevs");
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(FARPROC)pcap_open_live = GetProcAddress(wpcap, "pcap_open_live");
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(FARPROC)pcap_next_ex = GetProcAddress(wpcap, "pcap_next_ex");
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(FARPROC)pcap_sendpacket = 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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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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void
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wpcap_send(void)
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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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/*---------------------------------------------------------------------------*/
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