Winpcap是一个强大的网络开发库,可以实现许多功能:获取可用的网络适配器;获取指定适配器信息(比如名称和描述信息);捕获指定网卡的数据封包;发送数据封包;过滤捕获的包以获取特定包等。
首先到http://www.winpcap.org/install/default.htm下载安装winpcap 驱动和DLL组件。
然后到http://www.winpcap.org/devel.htm.下载winpcap开发包,解压到指定目录,这里我解压到C:\WpdPack_4_0_2\WpdPack,可以看到里面包含了:Lib,Include,文档和示例程序。
首先创建一个C++控制台程序,设置如下:
1) 在“Configuration Properties -> C/C++ -> General”中,在Additional Include Directories加入Include路径(“C:\WpdPack_4_0_2\WpdPack\Include”)。
2) 在 “Configuration Properties -> Linker -> General” 中,在Additional Library Directories中加入 winpcap 库文件路径 ( “C:\WpdPack_4_0_2\WpdPack\Lib” ) 。
3) 在“Configuration Properties -> Linker -> Input”中, Additional Dependencies 加入用到的两个winpcap 库文件(wpcap.lib and Packet.lib ) 。
4) 为了使用Winpcap的远程访问,必须在预处理器中加入HAVE_REMOTE
示例程序1 获取适配器列表
#include <pcap.h>
int _tmain(
int argc, _TCHAR* argv[])
{
pcap_if_t * allAdapters;
//
适配器列表
pcap_if_t * adapter;
char errorBuffer[ PCAP_ERRBUF_SIZE ];
//
错误信息缓冲区
if( pcap_findalldevs_ex( PCAP_SRC_IF_STRING, NULL,
&allAdapters, errorBuffer ) == -
1 )
{
//
检索机器连接的所有网络适配器
fprintf( stderr,
"
Error in pcap_findalldevs_ex function: %s\n
", errorBuffer );
return -
1;
}
if( allAdapters == NULL )
{
//
不存在人任何适配器
printf(
"
\nNo adapters found! Make sure WinPcap is installed.\n
" );
return
0;
}
int crtAdapter =
0;
for( adapter = allAdapters; adapter != NULL; adapter = adapter->next)
{
//
遍历输入适配器信息(名称和描述信息)
printf(
"
\n%d.%s
", ++crtAdapter, adapter->name );
printf(
"
-- %s\n
", adapter->description );
}
printf(
"
\n
" );
pcap_freealldevs( allAdapters );
//
释放适配器列表
system(
"
PAUSE
" );
return
0;
}
示例程序2 打开指定适配器并捕获数据包
#include <pcap.h>
int _tmain(
int argc, _TCHAR* argv[])
{
pcap_if_t * allAdapters;
//
适配器列表
pcap_if_t * adapter;
pcap_t * adapterHandle;
//
适配器句柄
struct pcap_pkthdr * packetHeader;
const u_char * packetData;
char errorBuffer[ PCAP_ERRBUF_SIZE ];
//
错误信息缓冲区
if( pcap_findalldevs_ex( PCAP_SRC_IF_STRING, NULL,
&allAdapters, errorBuffer ) == -
1 )
{
//
检索机器连接的所有网络适配器
fprintf( stderr,
"
Error in pcap_findalldevs_ex function: %s\n
", errorBuffer );
return -
1;
}
if( allAdapters == NULL )
{
//
不存在任何适配器
printf(
"
\nNo adapters found! Make sure WinPcap is installed.\n
" );
return
0;
}
int crtAdapter =
0;
for( adapter = allAdapters; adapter != NULL; adapter = adapter->next)
{
//
遍历输入适配器信息(名称和描述信息)
printf(
"
\n%d.%s
", ++crtAdapter, adapter->name );
printf(
"
-- %s\n
", adapter->description );
}
printf(
"
\n
" );
//
选择要捕获数据包的适配器
int adapterNumber;
printf(
"
Enter the adapter number between 1 and %d:
", crtAdapter );
scanf_s(
"
%d
", &adapterNumber );
if( adapterNumber <
1 || adapterNumber > crtAdapter )
{
printf(
"
\nAdapter number out of range.\n
" );
//
释放适配器列表
pcap_freealldevs( allAdapters );
return -
1;
}
adapter = allAdapters;
for( crtAdapter =
0; crtAdapter < adapterNumber -
1; crtAdapter++ )
adapter = adapter->next;
//
打开指定适配器
adapterHandle = pcap_open( adapter->name,
//
name of the adapter
65536,
//
portion of the packet to capture
//
65536 guarantees that the whole
//
packet will be captured
PCAP_OPENFLAG_PROMISCUOUS,
//
promiscuous mode
1000,
//
read timeout - 1 millisecond
NULL,
//
authentication on the remote machine
errorBuffer
//
error buffer
);
if( adapterHandle == NULL )
{
//
指定适配器打开失败
fprintf( stderr,
"
\nUnable to open the adapter\n
", adapter->name );
//
释放适配器列表
pcap_freealldevs( allAdapters );
return -
1;
}
printf(
"
\nCapture session started on adapter %s\n
", adapter->name );
pcap_freealldevs( allAdapters );
//
释放适配器列表
//
开始捕获数据包
int retValue;
while( ( retValue = pcap_next_ex( adapterHandle,
&packetHeader,
&packetData ) ) >=
0 )
{
//
timeout elapsed if we reach this point
if( retValue ==
0 )
continue;
//
打印捕获数据包的信息
printf(
"
length of packet: %d\n
", packetHeader->len );
}
//
if we get here, there was an error reading the packets
if( retValue == -
1 )
{
printf(
"
Error reading the packets: %s\n
", pcap_geterr( adapterHandle ) );
return -
1;
}
system(
"
PAUSE
" );
return
0;
}
示例程序3 发送数据封包
#include <pcap.h>
int _tmain(
int argc, _TCHAR* argv[])
{
pcap_if_t * allAdapters;
//
适配器列表
pcap_if_t * adapter;
pcap_t * adapterHandle;
//
适配器句柄
u_char packet[
20 ];
//
待发送的数据封包
char errorBuffer[ PCAP_ERRBUF_SIZE ];
//
错误信息缓冲区
if( pcap_findalldevs_ex( PCAP_SRC_IF_STRING, NULL,
&allAdapters, errorBuffer ) == -
1 )
{
//
检索机器连接的所有网络适配器
fprintf( stderr,
"
Error in pcap_findalldevs_ex function: %s\n
", errorBuffer );
return -
1;
}
if( allAdapters == NULL )
{
//
不存在人任何适配器
printf(
"
\nNo adapters found! Make sure WinPcap is installed.\n
" );
return
0;
}
int crtAdapter =
0;
for( adapter = allAdapters; adapter != NULL; adapter = adapter->next)
{
//
遍历输入适配器信息(名称和描述信息)
printf(
"
\n%d.%s
", ++crtAdapter, adapter->name );
printf(
"
-- %s\n
", adapter->description );
}
printf(
"
\n
" );
//
选择适配器
int adapterNumber;
printf(
"
Enter the adapter number between 1 and %d:
", crtAdapter );
scanf_s(
"
%d
", &adapterNumber );
if( adapterNumber <
1 || adapterNumber > crtAdapter )
{
printf(
"
\nAdapter number out of range.\n
" );
//
释放适配器列表
pcap_freealldevs( allAdapters );
return -
1;
}
adapter = allAdapters;
for( crtAdapter =
0; crtAdapter < adapterNumber -
1; crtAdapter++ )
adapter = adapter->next;
//
打开指定适配器
adapterHandle = pcap_open( adapter->name,
//
name of the adapter
65536,
//
portion of the packet to capture
//
65536 guarantees that the whole
//
packet will be captured
PCAP_OPENFLAG_PROMISCUOUS,
//
promiscuous mode
1000,
//
read timeout - 1 millisecond
NULL,
//
authentication on the remote machine
errorBuffer
//
error buffer
);
if( adapterHandle == NULL )
{
//
指定适配器打开失败
fprintf( stderr,
"
\nUnable to open the adapter\n
", adapter->name );
//
释放适配器列表
pcap_freealldevs( allAdapters );
return -
1;
}
pcap_freealldevs( allAdapters );
//
释放适配器列表
//
创建数据封包
//
设置目标的MAC地址为01 : 01 : 01 : 01 : 01 : 01
packet[
0] =
0x01;
packet[
1] =
0x01;
packet[
2] =
0x01;
packet[
3] =
0x01;
packet[
4] =
0x01;
packet[
5] =
0x01;
//
设置源的MAC地址为02 : 02 : 02 : 02 : 02 : 02
packet[
6] =
0x02;
packet[
7] =
0x02;
packet[
8] =
0x02;
packet[
9] =
0x02;
packet[
10] =
0x02;
packet[
11] =
0x02;
//
设置封包其他部分内容
for(
int index =
12; index <
20; index++ )
{
packet[index] =
0xC4;
}
//
发送数据封包
if( pcap_sendpacket( adapterHandle,
//
the adapter handle
packet,
//
the packet
20
//
the length of the packet
) !=
0 )
{
fprintf( stderr,
"
\nError sending the packet: \n
", pcap_geterr( adapterHandle ) );
return -
1;
}
system(
"
PAUSE
" );
return
0;
}
参考文章:
1,Introduction to the Winpcap Networking Libraries