/// <summary>
/// Checks whether an IP address matches to an exception rule
/// </summary>
/// <param name="ipAddress">The IP address to check</param>
/// <param name="exceptionRule">The exception rule to match it against</param>
/// <returns>True if the IP address matches to the exception rule. False otherwise</returns>
private bool IpAddressMatchesExceptionRule(IPAddress ipAddress, ExceptionRule exceptionRule)
{
if (String.IsNullOrEmpty(exceptionRule.Mask) && IPAddress.Parse(exceptionRule.IpAddress).Equals(ipAddress))
{
return(true);
}
if (!String.IsNullOrEmpty(exceptionRule.Mask) && IPUtilities.IsInSameSubnet(ipAddress, exceptionRule.IpAddress, exceptionRule.Mask))
{
return(true);
}
return(false);
}
/// <summary>
/// Checks for conflicts between the new rule and the existing exception rules
/// </summary>
/// <param name="newRule">The new rule to check</param>
/// <returns>True if there is no conflict. False otherwise</returns>
private bool CheckNewRule(ExceptionRule newRule)
{
foreach (ExceptionRule existingRule in this.existingRules)
{
if (String.IsNullOrEmpty(newRule.Mask))
{
if (String.IsNullOrEmpty(existingRule.Mask))
{
if (newRule.IpAddress.Equals(existingRule.IpAddress))
{
if (newRule.AllowedMode == existingRule.AllowedMode)
{
MessageBox.Show(this, "This exception rule allready exists", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
return(false);
}
else
{
MessageBox.Show(this, "This exception rule conflicts with rule: " + existingRule.ToString(), this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
return(false);
}
}
}
else
{
if (IPUtilities.IsInSameSubnet(newRule.IpAddress, existingRule.IpAddress, existingRule.Mask))
{
if (newRule.AllowedMode == existingRule.AllowedMode)
{
DialogResult result = MessageBox.Show(this, "This exception rule overlaps with rule: " + existingRule.ToString() + ". Add it anyway?", this.Text, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1);
if (result == DialogResult.Yes)
{
return(true);
}
else
{
return(false);
}
}
else
{
MessageBox.Show(this, "This exception rule conflicts with rule: " + existingRule.ToString(), this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
return(false);
}
}
}
}
else
{
if (String.IsNullOrEmpty(existingRule.Mask))
{
if (IPUtilities.IsInSameSubnet(existingRule.IpAddress, newRule.IpAddress, newRule.Mask))
{
if (newRule.AllowedMode == existingRule.AllowedMode)
{
DialogResult result = MessageBox.Show(this, "This exception rule overlaps with rule: " + existingRule.ToString() + ". Add it anyway?", this.Text, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1);
if (result == DialogResult.Yes)
{
return(true);
}
else
{
return(false);
}
}
else
{
MessageBox.Show(this, "This exception rule conflicts with rule: " + existingRule.ToString(), this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
return(false);
}
}
}
else
{
if (IPUtilities.IsInSameSubnet(newRule.IpAddress, existingRule.IpAddress, existingRule.Mask) || IPUtilities.IsInSameSubnet(existingRule.IpAddress, newRule.IpAddress, newRule.Mask))
{
if (newRule.AllowedMode == existingRule.AllowedMode)
{
DialogResult result = MessageBox.Show(this, "This exception rule overlaps with rule: " + existingRule.ToString() + ". Add it anyway?", this.Text, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1);
if (result == DialogResult.Yes)
{
return(true);
}
else
{
return(false);
}
}
else
{
MessageBox.Show(this, "This exception rule conflicts with rule: " + existingRule.ToString(), this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
return(false);
}
}
}
}
}
return(true);
}
