private void BuildDHCPACK(PhysicalAddress chaddr, DhcpOption55 dhcpoption55, DhcpLeases dhcplease)
{
DhcpLeaseItem item = dhcplease.GetItem(chaddr);
// 必須
this.dhcpoptions_.Add(new DhcpOption53(DhcpPacket.MessageType.DHCPACK));
this.dhcpoptions_.Add(new DhcpOption(54, item.server_identifier_));
this.dhcpoptions_.Add(new DhcpOption(51, item.lease_time_));
// 任意
if (dhcpoption55.parameter_request_list_ != null)
{
foreach (byte b in dhcpoption55.parameter_request_list_)
{
switch (b)
{
case 1: this.dhcpoptions_.Add(new DhcpOption(1, item.subnet_mask_)); break;
case 3: this.dhcpoptions_.Add(new DhcpOption(3, item.router_)); break;
case 6: this.dhcpoptions_.Add(new DhcpOption(6, item.domain_name_server_)); break;
case 58: this.dhcpoptions_.Add(new DhcpOption(58, item.renewal_time_)); break;
case 59: this.dhcpoptions_.Add(new DhcpOption(59, item.rebinding_time_)); break;
default: break;
}
}
}
// 必須（最後必ず）
this.dhcpoptions_.Add(new DhcpOption(255));
}
private void BuildDHCPACK(DhcpPacket basePacket, DhcpLeases dhcplease)
{
DhcpLeaseItem item = dhcplease.GetItem(basePacket.chaddr_);
this.op_ = OP.BOOTREPLY;
this.htype_ = basePacket.htype_;
this.hlen_ = basePacket.hlen_;
this.xid_ = basePacket.xid_;
this.ciaddr_ = basePacket.ciaddr_;
this.yiaddr_ = item.yiaddr_;
this.siaddr_ = new IPAddress(0); // 仮
this.giaddr_ = basePacket.giaddr_;
this.chaddr_ = basePacket.chaddr_;
this.options_ = new DhcpOptions(
DhcpPacket.MessageType.DHCPACK,
basePacket.chaddr_,
basePacket.dhcpoption55_,
dhcplease
);
}
// コンストラクタ
// 受信パケットの Parameter Request List ベース
public DhcpOptions(DhcpPacket.MessageType message_type, PhysicalAddress chaddr, DhcpOption55 dhcpoption55, DhcpLeases dhcplease)
: this()
{
if (message_type == DhcpPacket.MessageType.DHCPOFFER)
{
BuildDHCPOFFER(chaddr, dhcpoption55, dhcplease);
}
if (message_type == DhcpPacket.MessageType.DHCPACK)
{
BuildDHCPACK(chaddr, dhcpoption55, dhcplease);
}
}
// コンストラクタ
// その他のパケットをベースに作成
public DhcpPacket(DhcpPacket basePacket, DhcpPacket.MessageType message_type, DhcpLeases dhcplease)
: this()
{
if (message_type == MessageType.DHCPOFFER)
{
BuildDHCPOFFER(basePacket, dhcplease);
}
if (message_type == MessageType.DHCPACK)
{
BuildDHCPACK(basePacket, dhcplease);
}
}