帮看一段C++代码

xixiju203 2015-10-12 03:23:58

有一段发网络包的程序，是WINDOWS下的，我想改写成LINUX下的C程序或者是PHP程序，但是看不懂这个的原理，因为我本身不会C跟C++ ，还请高手帮忙看看原理，如果能帮我翻译成LINUX下的C程序就更棒啦。在此谢过。



#include <stdlib.h>

#include <stdio.h>

#include <winsock2.h>

#include <ws2tcpip.h>

#include <iphlpapi.h>

#include <string.h>



#define HAVE_REMOTE

#include <pcap.h>



#pragma comment(lib, "Ws2_32.lib")

#pragma comment(lib, "IPHLPAPI.lib")

#pragma comment(lib, "Packet.lib")

#pragma comment(lib, "wpcap.lib")





#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))

#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))

#if WIN32

#define snprintf sprintf_s

#endif



struct packet_t {

	unsigned char dest_mac[6];

	unsigned char src_mac[6];

	unsigned short type;

	unsigned char data[32];

};



static int get_adapter_info(unsigned char *mac, char *name, int len);

void print_mac(unsigned char* mac, int len);

int string2mac(const char *buf, unsigned char* mac);





int main(int argc, char **argv)

{

	pcap_t *fp;

	char errbuf[PCAP_ERRBUF_SIZE];

	char dev_name[512];

	struct packet_t packet;

	int i=0;



#if 1

	/* 检查命令行参数的合法性 */

	if (argc != 2)

	{

		printf("usage: %s mac", argv[0]);

		return -1;

	}

#endif



	memset((void*)&packet, 0, sizeof(struct packet_t));

	string2mac(argv[1], &(packet.dest_mac[0]));

	printf("mac: %s\n", argv[1]);

	printf("dest mac: ");

	print_mac(packet.dest_mac, 6);

	printf("\n");



	snprintf(dev_name, sizeof(dev_name), "rpcap://\\Device\\NPF_");

	get_adapter_info(&(packet.src_mac[0]), dev_name+strlen(dev_name), sizeof(dev_name)-strlen(dev_name));

	printf("src mac: ");

	print_mac(packet.src_mac, 6);

	printf("\n");

	printf("adapter name: %s\n", dev_name);





	/* 打开输出设备 */

	if ((fp = pcap_open(dev_name,            // 设备名

		100,                // 要捕获的部分 (只捕获前100个字节)

		PCAP_OPENFLAG_PROMISCUOUS,  // 混杂模式

		1000,               // 读超时时间

		NULL,               // 远程机器验证

		errbuf              // 错误缓冲

		)) == NULL)

	{

		fprintf(stderr, "\nUnable to open the adapter. %s is not supported by WinPcap\n", argv[1]);

		return -1;

	}



	packet.type = htons(0x0800);

	packet.data[0] = 0xFF;

	for (i = 0; i < 31; i++)

	{

		packet.data[i + 1] = i;

	}





	/* 发送数据包 */

	if (pcap_sendpacket(fp, (unsigned char *)&packet, sizeof(struct packet_t)) != 0)

	{

		fprintf(stderr, "\nError sending the packet: %s\n", pcap_geterr(fp));

		return -1;

	}



	return 0;

}



static int get_adapter_info(unsigned char *mac, char *name, int len)

{

	int i;

	PIP_ADAPTER_INFO pAdapterInfo;

	PIP_ADAPTER_INFO pAdapter = NULL;

	DWORD dwRetVal = 0;



	if (mac == NULL || name == NULL || len <= 0 )

	{

		printf("[get_adapter_info:%d] Invalid parameter\n", __LINE__);

		return -1;

	}



	ULONG ulOutBufLen = sizeof(IP_ADAPTER_INFO);

	pAdapterInfo = (IP_ADAPTER_INFO *)MALLOC(sizeof(IP_ADAPTER_INFO));

	if (pAdapterInfo == NULL) {

		printf("Error allocating memory needed to call GetAdaptersinfo\n");

		return 1;

	}

	// Make an initial call to GetAdaptersInfo to get

	// the necessary size into the ulOutBufLen variable

	if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {

		FREE(pAdapterInfo);

		pAdapterInfo = (IP_ADAPTER_INFO *)MALLOC(ulOutBufLen);

		if (pAdapterInfo == NULL) {

			printf("Error allocating memory needed to call GetAdaptersinfo\n");

			return 1;

		}

	}



	if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) == NO_ERROR) {

		pAdapter = pAdapterInfo;

		while (pAdapter) {

			printf("\tComboIndex: \t%d\n", pAdapter->ComboIndex);

			printf("\tAdapter Name: \t%s\n", pAdapter->AdapterName);

			printf("\tAdapter Desc: \t%s\n", pAdapter->Description);

			printf("\tAdapter Addr: \t");

			for (i = 0; i < pAdapter->AddressLength; i++) {

				if (i == (pAdapter->AddressLength - 1))

					printf("%.2X\n", (int)pAdapter->Address[i]);

				else

					printf("%.2X-", (int)pAdapter->Address[i]);

			}

			printf("\tIndex: \t%d\n", pAdapter->Index);



			if (pAdapter->Type == MIB_IF_TYPE_ETHERNET)

			{

				memcpy(mac, pAdapter->Address, pAdapter->AddressLength);

				snprintf(name, len, "%s", pAdapter->AdapterName);

			}



			pAdapter = pAdapter->Next;

		}

	}

	else {

		printf("GetAdaptersInfo failed with error: %d\n", dwRetVal);



	}

	if (pAdapterInfo)

		FREE(pAdapterInfo);



	return 0;



}



void print_mac(UCHAR* mac, int len)

{

	int i;

	for (i = 0; i < len; i++)

	{

		if (i == len - 1)

			printf("%02X", mac[i]);

		else

			printf("%02X-", mac[i]);

	}

}



int string2mac(const char *buf, unsigned char* mac)

{

	int i,j,len;

	unsigned char temp_buf[12] = { 0 };

	len = strlen(buf);

	if (buf == NULL || mac == NULL || len < 12)

		return -1;

	for (i=0, j=0; j<12&&i<len; i++)

	{

		if (buf[i] >= 'a' && buf[i] <= 'f')

		{

			temp_buf[j++] = buf[i] - 'a' + 0xA;

		}

		else if (buf[i] >= 'A' && buf[i] <= 'F')

		{

			temp_buf[j++] = buf[i] - 'A' + 0xA;

		}

		else if (buf[i] >= '0' && buf[i] <= '9')

		{

			temp_buf[j++] = buf[i] - '0';

		}

		else

		{

			if (!(buf[i] == '-' || buf[i] == ':'))

			{

				printf("Invalid mac format[%s]\n", buf);

				return -1;

			}

		}

	}



	mac[0] = ((temp_buf[0] << 4) & 0xF0) + temp_buf[1];

	mac[1] = ((temp_buf[2] << 4) & 0xF0) + temp_buf[3];

	mac[2] = ((temp_buf[4] << 4) & 0xF0) + temp_buf[5];

	mac[3] = ((temp_buf[6] << 4) & 0xF0) + temp_buf[7];

	mac[4] = ((temp_buf[8] << 4) & 0xF0) + temp_buf[9];

	mac[5] = ((temp_buf[10] << 4) & 0xF0) + temp_buf[11];

	return 0;

}