how to send ICMP packet

[eleanor]

Hi, I've build ICMP echo request packet:

#include <string.h>
 
class CIcmp {
public:
    CIcmp(char type[8], char code[8], char checksum[8], char identifier[8], char sequenceNumber[8], char *additionalData=0);
    ~CIcmp();
	char* icmpBuildPacket(char *packet);
 
};

#include <string.h>

class CIcmp {
public:
    CIcmp(char type[8], char code[8], char checksum[8], char identifier[8], char sequenceNumber[8], char *additionalData=0);
    ~CIcmp();
	char* icmpBuildPacket(char *packet);

};

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#include "icmp.h"
 
CIcmp::CIcmp(char type[8], char code[8], char checksum[8], char identifier[8], char sequenceNumber[8], char *additionalData) {
	char packet[strlen(type) + strlen(code) + strlen(checksum) + strlen(identifier) + strlen(sequenceNumber) + strlen(additionalData)];
 
	//packet[0] = *type;
	strcpy(packet, type);
	strcpy(packet, code);
	strcpy(packet, checksum);
	strcpy(packet, identifier);
	strcpy(packet, sequenceNumber);
	strcpy(packet, additionalData);
 
	icmpBuildPacket(packet);
 
}
 
CIcmp::~CIcmp() {
 
}
 
char* CIcmp::icmpBuildPacket(char *packet) {
	return packet;
}

#include "icmp.h"

CIcmp::CIcmp(char type[8], char code[8], char checksum[8], char identifier[8], char sequenceNumber[8], char *additionalData) {
	char packet[strlen(type) + strlen(code) + strlen(checksum) + strlen(identifier) + strlen(sequenceNumber) + strlen(additionalData)];

	//packet[0] = *type;
	strcpy(packet, type);
	strcpy(packet, code);
	strcpy(packet, checksum);
	strcpy(packet, identifier);
	strcpy(packet, sequenceNumber);
	strcpy(packet, additionalData);

	icmpBuildPacket(packet);

}

CIcmp::~CIcmp() {

}

char* CIcmp::icmpBuildPacket(char *packet) {
	return packet;
}

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Now I want to know, if I did that correctly? (I know I have to calculate the checksum, but let's say the additionalData is always 0 for now)

Well, now I need a way to send this packet over the network to destination --> what would be the best way to do that?

[kernel_panic]

raw socket.
i think you have to write an own rawsocket class, which handles the socket platform specific.

maybe this helps you:
http://www.c-worker.ch/winsock/ping.cpp
http://www.alhem.net/Sockets/index.html

[wysota]

If you are using a secure* system, you need super-user priviledges to craft icmp packets and you have to use platform dependent code as already suggested.


*) non-Windows