四透析ICMP协议: 应用篇ping(RAW Socket)( 三 ) _云知道

cksum= *(UCHAR*)buffer;
}
// Do a little shuffling
cksum = (cksum >> 16)(cksum & 0xffff);
cksum= (cksum >> 16);

// Return the bitwise complement of the resulting mishmash
return (USHORT)(~cksum);
}
//初试化RAW Socket, 设置ttl, 初试化dest
// 返回值 <0 表失败
int setup_for_ping(char* host, int ttl, SOCKET& sd, sockaddr_in& dest)
{
// Create the socket
sd = WSASocket(AF_INET, SOCK_RAW, IPPROTO_ICMP, 0, 0, 0);
if (sd == INVALID_SOCKET) {
cerr << "Failed to create raw socket: " << WSAGetLastError() <<
endl;
return -1;
}
if (setsockopt(sd, IPPROTO_IP, IP_TTL, (const char*)&ttl,
sizeof(ttl)) == SOCKET_ERROR) {
cerr << "TTL setsockopt failed: " << WSAGetLastError() << endl;
return -1;
}
// Initialize the destination host info block
memset(&dest, 0, sizeof(dest));

;// Turn first passed parameter into an IP address to ping
unsigned int addr = inet_addr(host);
if (addr != INADDR_NONE) {
// It was a dotted quad number, so save result
dest.sin_addr.s_addr = addr;
dest.sin_family = AF_INET;
}
else {
// Not in dotted quad form, so try and look it up
hostent* hp = gethostbyname(host);
if (hp != 0) {
// Found an address for that host, so save it
memcpy(&(dest.sin_addr), hp->h_addr, hp->h_length);
dest.sin_family = hp->h_addrtype;
}
else {
// Not a recognized hostname either!
cerr << "Failed to resolve " << host << endl;
return -1;
}
}
return 0;
}
//初试化ICMP的包头, 给data部分填充数据, 最后计算整个包的校验和
void init_ping_packet(ICMPHeader* icmp_hdr, int packet_size, int seq_no)
{
// Set up the packet"s fields
icmp_hdr->type = ICMP_ECHO_REQUEST;
icmp_hdr->code = 0;
icmp_hdr->checksum = 0;
icmp_hdr->id = (USHORT)GetCurrentProcessId();
icmp_hdr->seq = seq_no;
icmp_hdr->timestamp = GetTickCount();
【四透析ICMP协议: 应用篇ping(RAW Socket)】 // "You"re dead meat now, packet!"
const unsigned long int deadmeat = 0xDEADBEEF;
char* datapart = (char*)icmp_hdrsizeof(ICMPHeader);
int bytes_left = packet_size - sizeof(ICMPHeader);
while (bytes_left > 0) {
memcpy(datapart, &deadmeat, min(int(sizeof(deadmeat)),
bytes_left));
bytes_left -= sizeof(deadmeat);
datapart= sizeof(deadmeat);
}
// Calculate a checksum on the result
icmp_hdr->checksum = ip_checksum((USHORT*)icmp_hdr, packet_size);
}

// 发送生成的ICMP包
// 返回值 <0 表失败
int send_ping(SOCKET sd, const sockaddr_in& dest, ICMPHeader* send_buf,
int packet_size)
{
// Send the ping packet in send_buf as-is
cout << "Sending " << packet_size << " bytes to " <<
inet_ntoa(dest.sin_addr) << "..." << flush;
int bwrote = sendto(sd, (char*)send_buf, packet_size, 0,
(sockaddr*)&dest, sizeof(dest));
if (bwrote == SOCKET_ERROR) {
cerr << "send failed: " << WSAGetLastError() << endl;
return -1;
}
else if (bwrote < packet_size) {
cout << "sent " << bwrote << " bytes..." << flush;
}
return 0;
}
// 接受ICMP包
// 返回值 <0 表失败
int recv_ping(SOCKET sd, sockaddr_in& source, IPHeader* recv_buf,
int packet_size)
{
// Wait for the ping reply
int fromlen = sizeof(source);
int bread = recvfrom(sd, (char*)recv_buf,
packet_sizesizeof(IPHeader), 0,
(sockaddr*)&source, &fromlen);
if (bread == SOCKET_ERROR) {
cerr << "read failed: ";
if (WSAGetLastError() == WSAEMSGSIZE) {
cerr << "buffer too small" << endl;
}

四透析ICMP协议: 应用篇ping(RAW Socket)( 三 )

推荐阅读

我在招行申请信用卡没过为什么

好听可爱的狗狗名字好听可爱的狗狗名字介绍

做贺卡的材料有哪些做贺卡的材料有哪些图片

男生搭肩是想试探什么

五月应季水果有哪些

安徽319省道多少公里安徽省道s338哪到哪的

ecco面料什么皮质

红豆糖水有什么功效

华夏保险被接管了还能买吗

河洛群侠传浑金剑决在哪里关刀及浑金剑决获得方法

arin是哪个国家,和scar相比哪个好用

中考分数怎样算的中考的分数怎么出的啊

北在哪里坐苏州北在哪里坐汽车

全中国各市房价,还有哪里的房价最便宜

关节弹响是什么原因？需要治疗吗？

苹果官网为什么不降价,京东苹果8和8p直降千元

四 透析ICMP协议: 应用篇ping(RAW Socket)( 三 )

推荐阅读

四透析ICMP协议: 应用篇ping(RAW Socket)( 三 )