/// <summary>
/// Adds a standard DNS entry into the dns cache
/// </summary>
/// <param name="domain"></param>
/// <param name="ip"></param>
/// <returns></returns>
private string AddDNSNameEntry(string domain, string ip)
{
//go to the deepest level possible:
string[] domainLevels = domain.Split('.').Reverse().ToArray();
DNSRecord deepestRecord = null;
for (int i = 1; i <= domainLevels.Length; i++)
{
deepestRecord = LookupByName(domainLevels.SubArray(0, i));
if (deepestRecord == null)
{
//get the previous record and then break.
deepestRecord = LookupByName(domainLevels.SubArray(0, i - 1));
break;
}
if (!deepestRecord.HasSubDomains())
{
break;
}
}
// start creating from the latest deepestRecord
if (deepestRecord != null)
{
int depthStartingIndex = Array.IndexOf(domainLevels, deepestRecord.Domain) + 1;
if (depthStartingIndex == domainLevels.Length - 1) //means the last item in the array
{
DNSRecord r = new DNSRecord
{
Domain = domainLevels[depthStartingIndex],
Address = ip
};
deepestRecord.SubDomains.Add(r);
SaveDomainNameTable();
return(r.ToString());
}
else if (depthStartingIndex == domainLevels.Length)
{
return($"Sub Domain {domainLevels[depthStartingIndex - 1]} already exists, please try editing instead of creating.");
}
else
{
return($"Missing subdomain record for {domainLevels[depthStartingIndex - 1]}.");
}
}
else
{
return("No proper domain name specified, please try again.");
}
}
/// <summary>
/// Adds an ARPA DNS entry into the dns cache
/// </summary>
/// <param name="domain"></param>
/// <param name="ip"></param>
/// <returns></returns>
private string AddDNSIpEntry(string domain, string ip)
{
string[] ipSection = ip.Split('.');
DNSRecord arpaRecord = Root.GetSubRecord("arpa").GetSubRecord("ipv4");
if (arpaRecord == null || !ip.IsValidIpAddress()) //check if the arpa exists and the ip is valid
{
throw new Exception($"Error ARPA search for ip: {ip}");
}
//find or create the third ip segment
for (int i = 0; i < 4; i++)
{
DNSRecord subDomain = arpaRecord.GetSubRecord(ipSection[i]);
if (subDomain == null)
{
DNSRecord r = new DNSRecord
{
Domain = ipSection[i]
};
arpaRecord.SubDomains.Add(r);
subDomain = arpaRecord.GetSubRecord(ipSection[i]);
}
arpaRecord = subDomain;
}
// now start adding the final arpa record
if (arpaRecord.GetSubRecord(domain) == null) //means the arpa record doesnt exists yet
{
DNSRecord r = new DNSRecord
{
Domain = domain
};
arpaRecord.SubDomains.Add(r);
SaveDomainNameTable();
return(r.ToString());
}
else
{
return($"Arpa record for {domain} already exists, please try editing instead of creating.");
}
}
/// <summary>
/// Lets you search for DNS entry's
/// </summary>
/// <param name="fDomainIp"></param>
/// <param name="value"></param>
/// <returns></returns>
public string ShowDNSEntry(bool fDomainIp, string value)
{
if (fDomainIp)
{
DNSRecord recordDNS = LookupByName(value.Split('.').Reverse().ToArray());
if (recordDNS == null)
{
return($"Domain {value} not found");
}
return(recordDNS.ToString());
}
else
{
DNSRecord recordARP = LookupByIp(value);
if (recordARP == null)
{
return($"ARPA for {value} not found");
}
return(recordARP.ToString());
}
}
/// <summary>
/// Edits the DNS entry specified with the flag parameter
/// </summary>
/// <param name="fDomainIp"></param>
/// <param name="currentDomain"></param>
/// <param name="newField"></param>
/// <returns></returns>
public string EditDNSEntry(bool fDomainIp, string currentDomain, string newField)
{
string[] domainSplit = currentDomain.Split('.').Reverse().ToArray();
DNSRecord recordDNS = LookupByName(domainSplit);
if (recordDNS == null)
{
return($"Domain {currentDomain} not found");
}
string ip = recordDNS.Address;
if (fDomainIp) //search by domain, change the domain
{
recordDNS.Domain = newField;
DNSRecord recordARP = LookupByIp(ip);
recordARP = recordARP.GetSubRecord(currentDomain);
if (recordARP != null)
{
string[] newValueSplit = newField.Split('.').Reverse().ToArray();
recordARP.Domain = newValueSplit[0];
}
}
else //search by domain name, change the ip
{
recordDNS.Address = newField;
DNSRecord recordARP = LookupByIp(ip);
if (recordARP.GetSubRecord(currentDomain) != null)
{
//this record exists, delete it
recordARP.SubDomains.Remove(recordARP.GetSubRecord(currentDomain));
AddDNSIpEntry(currentDomain, newField);
}
}
SaveDomainNameTable();
return(recordDNS.ToString());
}