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Subnet Calculator

rcast (354)
I wanted to test my knowledge - and create a useful tool for me and others in IT, so I developed over the past 3 days this subnet calculator, it works good. If you find anything bugs with what the program outputs let me know. I'm not interested in criticism about my syntax or use of the language, I know now that every project over 100 lines needs a planning phase (which I will do from now on). This looks good when it runs at least! Give a compile and test

Sorry for the extremely uneasy to read and unnecessarily complex code - I'm only 2 1/2 weeks into learning C++. Thanks!

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// Subnet Calculator, by rocco castoro

#include "stdafx.h"
#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <stdio.h>
#include <math.h>
using namespace std;



int getOctetsIP(string ip, vector<int> &octetsIP) {		// Define vector<int> octets, using reference from main
	stringstream sip(ip);								// use stringstream named ss and populate with ip
	string temp;
	octetsIP.clear();									// Clears the octetsMask vector, in case main function re-runs this function
	vector<bool> ipInRange;
	while (getline(sip,temp,'.'))						// Every time getline recieves new stream element from ss, save to temp
		octetsIP.push_back(atoi(temp.c_str()));			//... until reaches '.' delimiter, then push_back octet with new element.
	if (octetsIP.size() == 4) {
		for(int i = 0; i < octetsIP.size(); i++){
			if (octetsIP[i] >= 0 && octetsIP[i] <= 255)
				ipInRange.push_back(true);
			else
				ipInRange.push_back(false);
		}
		if (ipInRange[0]==true&&ipInRange[1]==true&&ipInRange[2]==true&&ipInRange[3]==true){
			return 0;
		}else{
			cout << endl << "There are only 255 bits per octet. Please re-enter IP." << endl << endl;
			return 1;
		}
	}else{
		cout << endl << "Please enter four octets in dot notation." << endl << endl;
		return 1;
	}
}




int getOctetsMask(string mask,  vector<int> &octetsMask) {
	stringstream smask(mask);
	string temp;
	octetsMask.clear();		// Clears the octetsMask vector, in case main function re-runs this function
	vector<bool> maskInRange;
	while (getline(smask,temp,'.'))
		octetsMask.push_back(atoi(temp.c_str()));
	if (octetsMask.size() == 4){
		for(int i = 0; i < octetsMask.size(); i++){
			if (octetsMask[i] == 0 || octetsMask[i] == 128 || octetsMask[i] == 192 || octetsMask[i] == 224 || octetsMask[i] == 240 || octetsMask[i] == 248 || octetsMask[i] == 252 || octetsMask[i] == 254 || octetsMask[i] == 255)
				maskInRange.push_back(true);
			else
				maskInRange.push_back(false);
		}
		if(maskInRange[0]==true&&maskInRange[1]==true&&maskInRange[2]==true&&maskInRange[3]==true){
			return 0;
		}else{
			cout << endl << "Subnet masks only use 2^1-8. Please re-enter mask." << endl << endl;
			return 1;
		}
	}else{
		cout << endl << "Please enter four octets in dot notation." << endl << endl;
		return 1;
	}
}




int calcClass(vector<int> &octetsIP) {
	if (octetsIP[0] == 10) {
		return 1;	// Class A Private address blocks //
	}else if (octetsIP[0] == 172 && octetsIP[1] >= 16 && octetsIP[1] <= 31) {
		return 2;	// Class B Private address blocks //
	}else if (octetsIP[0] == 192 && octetsIP[1] == 168) {
		return 3;	// Class C Private address blocks //
	}else if (octetsIP[0] == 127) {
		return 4;	// Loopback Address Reserved address blocks //
	}else if (octetsIP[0] >= 0 && octetsIP[0] < 127) {
		return 5;
	}else if (octetsIP[0] > 127 && octetsIP[0] < 192) {
		return 6;
	}else if (octetsIP[0] > 191 && octetsIP[0] < 224) {
		return 7;
	}else if (octetsIP[0] > 223 && octetsIP[0] < 240) {
		return 8;
	}else if (octetsIP[0] > 239 && octetsIP[0] <= 255) {
		return 9;
	}else{
		return 0;	// Out of Range //
	}
}




// Determine Binary /--
int getNHBits(vector<int> &octetsIP, vector<int> &octetsMask, vector<int> &octetsIPBits, vector<int> &octetsMaskBits){

	// Get IP binary rep. // 
cout << "------------------------------------------" << endl;
cout << "///////// Binary Representation //////////" << endl;
cout << "------------------------------------------" << endl;
	for (int j=0; j < octetsIP.size(); j++)
    {
		if (j>0)
			cout << ".";

        int mask = 128;
        while (mask)
        {
            octetsIPBits.push_back((octetsIP[j] & mask) != 0);
			cout << ((octetsIP[j] & mask) != 0);
            mask >>= 1;
        }
    }
	cout << "  : IP Address" << endl;

	// Get SUBNET binary rep. // 
	for (int j=0; j < octetsMask.size(); j++)
    {
		if (j>0)
			cout << ".";
        int mask = 128;
        while (mask)
        {
            octetsMaskBits.push_back((octetsMask[j] & mask) != 0);
			cout << ((octetsMask[j] & mask) != 0);
            mask >>= 1;
        }
    }
	cout << "  : Subnet Mask" << endl;
	cout << "-----------------------------------------" << endl;

return 0;
}



// Perform ANDing of IP and Subnet Mask to generate Network ID range //
vector<int> getNetID(vector<int> &octetsIPBits, vector<int> &octetsMaskBits){
	vector<int> netID;
    for (int j=0; j < octetsIPBits.size(); j++)
    {
        if ((j > 0) && (j%8 == 0))
            cout << ".";

		netID.push_back(octetsIPBits[j] & octetsMaskBits[j]);
    }
return netID;
}


// Turn Binary back to Decimal
string toString(vector<int> octets){
	ostringstream octStrm;

	for(int j = 0; j < octets.size(); j++)
	{
		if (j>0)
			octStrm << '.';

		octStrm << octets[j];
	}
	
	return octStrm.str();
}


// Turn Binary back to Decimal
vector<int> toDecimal(vector<int> octets, vector<int> &decimals){
	stringstream octStrm;
	decimals.clear();
	for(int j = 0; j < octets.size(); j++)
	{
		if (j>0)
			octStrm << '.';

		octStrm << octets[j];
	}

	string temp;
	while (getline(octStrm, temp, '.'))
		decimals.push_back(atoi(temp.c_str()));
	
	return decimals;
}

Last edited on
rcast (354)
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// Get the network increment //
int getIncrement(vector<int> decimalMask, vector<int> decimalNetID){
	int increment = 0;
	for (int i=0; i<decimalMask.size(); i++){
		if (decimalMask[i] == 255){
			increment = 1;
		}else if(decimalMask[i] == 254){
			increment = 2;
			break;
		}else if(decimalMask[i] == 252){
			increment = 4;
			break;
		}else if(decimalMask[i] == 248){
			increment = 8;
			break;
		}else if(decimalMask[i] == 240){
			increment = 16;
			break;
		}else if(decimalMask[i] == 224){
			increment = 32;
			break;
		}else if(decimalMask[i] == 192){
			increment = 64;
			break;
		}else if(decimalMask[i] == 128){
			increment = 128;
			break;
		}
	}
return increment;
}

// get network id range
vector<int> getNetIDRange(vector<int> &decimalNetID, int &netInc, vector<int> &decimalMask) {
	vector<int> netIDEnd;
	for (int i=0; i<decimalNetID.size(); i++){
		if (decimalMask[i] == 255){
			netIDEnd.push_back(decimalNetID[i]);
		}else if (decimalMask[i] < 255 && decimalMask[i] > 0){
			netIDEnd.push_back( (decimalNetID[i] + netInc) - 1);
		}else{
			netIDEnd.push_back(255);
		}
	}
	return netIDEnd;
}



// Get subnets
int getSubnets(vector<int> &decimalMask, int &ipClass, vector<int> &subClassMask){
	int netBits = 0;
	subClassMask.clear();
		if (ipClass==1){
			subClassMask.push_back(255);
			subClassMask.push_back(0);
			subClassMask.push_back(0);
			subClassMask.push_back(0);
		}else if(ipClass==2){
			subClassMask.push_back(255);
			subClassMask.push_back(255);
			subClassMask.push_back(0);
			subClassMask.push_back(0);
		}else if(ipClass==3){
			subClassMask.push_back(255);
			subClassMask.push_back(255);
			subClassMask.push_back(255);
			subClassMask.push_back(0);
		}else if(ipClass==4 || ipClass==5){
			subClassMask.push_back(decimalMask[0]);
			subClassMask.push_back(decimalMask[1]);
			subClassMask.push_back(decimalMask[2]);
			subClassMask.push_back(decimalMask[3]);
		}

	for (int i=0; i<decimalMask.size(); i++){
		if (decimalMask[i] != subClassMask[i]){
			if (decimalMask[i] == 255){
				netBits += 8;
				continue;
			}else if (decimalMask[i] == 254){
				netBits += 7;
				continue;
			}else if (decimalMask[i] == 252){
				netBits += 6;
				continue;
			}else if (decimalMask[i] == 248){
				netBits += 5;
				continue;
			}else if (decimalMask[i] == 240){
				netBits += 4;
				continue;
			}else if (decimalMask[i] == 224){
				netBits += 3;
				continue;
			}else if (decimalMask[i] == 192){
				netBits += 2;
				continue;
			}else if (decimalMask[i] == 128){
				netBits += 1;
				continue;
			}else if (decimalMask[i] == 0){
				netBits += 0;
				continue;
			}else{
				netBits += 0;
			}
		}
	}
	int subnets = pow(2.0,netBits);
	return subnets;
}



// Get hosts per subnet
int getHostsPerSubnet(vector<int> &decimalMask){
	int hostBits = 0;
	for (int i=0; i<decimalMask.size(); i++){
		if (decimalMask[i] == 255){
			hostBits += 0;
			continue;
		}else if (decimalMask[i] == 254){
			hostBits += 1;
			continue;
		}else if (decimalMask[i] == 252){
			hostBits += 2;
			continue;
		}else if (decimalMask[i] == 248){
			hostBits += 3;
			continue;
		}else if (decimalMask[i] == 240){
			hostBits += 4;
			continue;
		}else if (decimalMask[i] == 224){
			hostBits += 5;
			continue;
		}else if (decimalMask[i] == 192){
			hostBits += 6;
			continue;
		}else if (decimalMask[i] == 128){
			hostBits += 7;
			continue;
		}else if (decimalMask[i] == 0){
			hostBits += 8;
			continue;
		}else{
			hostBits = 0;
			break;
		}
	}
	int hostsPerSubnet = pow(2.0,hostBits)-2;
	return hostsPerSubnet;
}


int main() {

// Give details, given an IP and Subnet Mask //
char resp = 'y';
while (resp == 'y') {
	cout << " //// -- IPv4 Subnetting Calculator -- \\\\\\\\" << endl;
	cout << "||||  ----- dev. by Rocco Castoro ----- ||||" << endl;
	cout << " \\\\\\\\ ----- rockycast@hotmail.com ---- ////" << endl;
	cout << endl << endl;

		// Get IP address octets //
		string ip;
		vector<int> octetsIP;
		while (getOctetsIP(ip, octetsIP) == 1) {
		cout << "Enter IPv4 Address -> ";
		(getline(cin, ip));		// Accept user input for IP Address //
		}

		// Get subnet mask octets //
		string mask;
		vector<int> octetsMask;
		while (getOctetsMask(mask, octetsMask) == 1) {
		cout << endl << "Enter subnet mask for " << ip << " -> ";
		(getline(cin, mask));	// Accept user input for subnet mask //
		}
		cout << endl << endl << endl << endl << endl;

		// Print Initial User IP and Subnet Mask //
		vector<int> decimals;
		cout << "//////////////////////////////////////////" << endl;
		cout << "/// IP Address: " << toString(octetsIP) << endl;
		vector<int> decimalMask = toDecimal(octetsMask, decimals);
		cout << "/// Subnet Mask: " << toString(octetsMask) << endl;
		cout << "//////////////////////////////////////////" << endl << endl;

		// Print Binary Representation //
		vector<int> octetsIPBits;
		vector<int> octetsMaskBits;
		getNHBits(octetsIP, octetsMask, octetsIPBits, octetsMaskBits);
		vector<int> netID = getNetID(octetsIP, octetsMask);
		vector<int> decimalNetID = toDecimal(netID, decimals);
		int netInc = getIncrement(decimalMask, decimalNetID);
		cout << endl;

		// Print IP Class
			// Run function to determine and print IP class
			cout << "------------------------------------------" << endl;
			cout << "//////////// Class Information ///////////" << endl;
			cout << "------------------------------------------" << endl;
			int classResult = calcClass(octetsIP);
			int ipClass = 0;
			switch (classResult){
				case 1:
					cout << "IP Class: Private block, Class 'A' " << endl;
					ipClass = 1;
					break;
				case 2:
					cout << "IP Class: Private block, Class 'B'" << endl;
					ipClass = 2;
					break;
				case 3:
					cout << "IP Class: Private block, Class 'C'" << endl;
					ipClass = 3;
					break;
				case 4:
					cout << "IP Class: Reserved block, System Loopback Address" << endl;
					ipClass = 1;
					break;
				case 5: 
					cout << "IP Class: A" << endl;
					ipClass = 1;
					break;
				case 6:
					cout << "IP Class: B" << endl;
					ipClass = 2;
					break;
				case 7:
					cout << "IP Class: C" << endl;
					ipClass = 3;
					break;
				case 8:
					cout << "IP Class: D" << endl;
					ipClass = 4;
					cout << "!! This is a reserved Class D Multicast IP Address Block" << endl;
					break;
				case 9:
					cout << "IP Class: E" << endl;
					ipClass = 5;
					cout << "!! This is a reserved Class E Multicast IP Address Block" << endl;
					break;
				default :
					cout << "Not in Range" << endl;
					break;
			}
		vector<int> subClassMask;
		getSubnets(decimalMask, ipClass, subClassMask);
		cout << "Default Class Subnet Mask: " << toString(subClassMask) << endl;
		cout << "-----------------------------------------" << endl << endl;

		// Print Subnetting Details //
		cout << "------------------------------------------" << endl;
		cout << "///////////// Subnet Details /////////////" << endl;
		cout << "------------------------------------------" << endl;
		vector<int> netIDRange = getNetIDRange(decimalNetID, netInc, decimalMask);
		cout << "Network ID: " << toString(netID) << " - ";
		cout << toString(netIDRange) << endl;
		cout << "Network Increment: " << getIncrement(decimalMask, decimalNetID) << endl;
		cout << "Number of Subnets: " << getSubnets(decimalMask, ipClass, subClassMask) << endl;
		cout << "Usable hosts per subnet: " << getHostsPerSubnet(decimalMask) << endl;
		cout << "-----------------------------------------" << endl << endl;

		cout << "Would you like to enter another IP Address to subnet? (y or n): ";
		cin >> resp;
		cout << endl << endl << endl << endl;
}
	return 0;
}


Thank you Chervil and everybody else that assisted me in learning process.
Last edited on
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