sendpacket.c

开发了一款模拟802.1x协议的网络编程.是在vc6.0下运行的.

/*参考了mystar的华为认证的实际认证格式所写.*/

#include "sendpacket.h"
#include "global.h"
#include "md5.h"

extern char          *m_name;
extern char          *m_password;
extern u_char         m_localIP[4];
extern u_char         m_localMAC[6];
extern u_char         m_destMAC[6];
extern int            m_uploadIP;


//Set Dest MAC, Source MAC, Protocol Type and Version

void InitBuf(u_char *buf)
{	

	u_char prototype[3] = {0x88, 0x8e, 0x01};

	memcpy(buf   , m_destMAC,  6);  //set server MAC
	memcpy(buf+6 , m_localMAC, 6);  //set source MAC
	memcpy(buf+12, prototype,  3);  //set protocol type and its version

}

//Send EAPOL-START packet to server

int SendLoginPacket(libnet_t *l)
{

	u_char buf[100] = {	0 };
	PLOGINFRM pbuf = (PLOGINFRM) buf;

	InitBuf(buf);

	pbuf->PktType = 0x01;	//EAPOL-START

 	fputs(">> Searching for server...\n",stdout);

	return (libnet_write_link(l,buf, 60)==60)?0:-1;

}

//Send username packet to server

int SendNamePacket(libnet_t *l, const u_char *pkt_data)
{
	
	u_char buf[100] = { 0 };
	PUSERNAMEFRM pbuf = (PUSERNAMEFRM) buf;
	PPKTHDR pkt_buf = (PPKTHDR)pkt_data;
	int nameLen = strlen(m_name);

	InitBuf(buf);
	pbuf->Hdr.Len1 = htons(nameLen + 0x0b);
	pbuf->Hdr.Code = 0x02;
	pbuf->Hdr.Id = pkt_buf->Id;
	pbuf->Hdr.Len2 = pbuf->Hdr.Len1;
	pbuf->Hdr.EapType = 0x01;
	pbuf->Unknown[0] = 0x15;
	pbuf->Unknown[1] = 0x04;

	if(m_uploadIP == 1)
		memcpy(pbuf->Ip, m_localIP, 4);//上传本机IP

	memcpy(&pbuf->Username, m_name, nameLen);

    fputs(">> Sending user name...\n",stdout);

    return (libnet_write_link(l,buf, 60)==60)?0:-1;
}

//Send password packet to server

int SendPasswordPacket(libnet_t *l,const u_char *pkt_data)
{
		
	u_char  buf[100] = { 0 };

	u_char  md5Data[256] = { 0 }; //md5 buffer
    u_char *md5Dig = NULL;        //result of md5 sum
    int     md5Len = 0;

	int nameLen,passwordLen;

    nameLen = strlen(m_name);
    passwordLen = strlen(m_password);

	PPASSWORDFRM pbuf = (PPASSWORDFRM) buf;
	PPKTHDR pkt_buf = (PPKTHDR)pkt_data;
	const u_char *Chap = ((PPASSWORDFRM) pkt_data)->Md5Pwd;

	InitBuf(buf);
	pbuf->Hdr.Len1 = htons(nameLen + 0x16);
	pbuf->Hdr.Code = 0x02;
	pbuf->Hdr.Id = pkt_buf->Id;
	pbuf->Hdr.Len2 = pbuf->Hdr.Len1;
	pbuf->Hdr.EapType = 0x04;
	pbuf->Unknown[0] = 0x10;

	md5Data[md5Len++] = pkt_buf->Id;//ID

    memcpy(md5Data+md5Len,m_password,passwordLen); 
	md5Len += passwordLen; //密码
	
    memcpy(md5Data+md5Len,Chap,16); 
	md5Len += 16; //密匙

    md5Dig = ComputeHash(md5Data, md5Len);//计算MD5
	

	memcpy(pbuf->Md5Pwd,md5Dig,16);
	memcpy(pbuf->Username, m_name, nameLen);

    fputs(">> Sending password... \n",stdout);
	
    return (libnet_write_link(l,buf, 60)==60)?0:-1;
	
}

//Send keep-on-line packet to server

int SendKeeponlinePacket(libnet_t *l,const u_char *pkt_data)
{

   u_char buf[100] = { 0 };
	PKEEPONLINEFRM pbuf = (PKEEPONLINEFRM) buf;
	PPKTHDR pkt_buf = (PPKTHDR)pkt_data;
	int nameLen = strlen(m_name);

	InitBuf(buf);
	pbuf->Hdr.Len1 = htons(nameLen + 0x0b);
	pbuf->Hdr.Code = 0x02;
	pbuf->Hdr.Id = pkt_buf->Id;
	pbuf->Hdr.Len2 = pbuf->Hdr.Len1;
	pbuf->Hdr.EapType = 0x14;
	pbuf->Unknown[0] = 0x00;
	pbuf->Unknown[1] = 0x15;
	pbuf->Unknown[2] = 0x04;

	if(m_uploadIP == 1)
		memcpy(pbuf->Ip, m_localIP, 4);//上传本机IP

	memcpy(pbuf->Username, m_name, nameLen);

	fputs(">> Keeping on line... \n",stdout);
	
   return (libnet_write_link(l,buf, 60)==60)?0:-1;

}

//Send EAPOL-LOGOUT packet to server

int  SendLogoutPacket(libnet_t *l)
{

 	u_char buf[100] = {	0 };
	PLOGOUTFRM pbuf = (PLOGOUTFRM) buf;

	InitBuf(buf);
	pbuf->PktType = 0x02;//EAPOL-LOGOUT

    fputs(">> Logouting... \n",stdout);

    return (libnet_write_link(l,buf,60)==60)?0:-1;

}