/// <summary> Convert captured packet data into an object.
/// </summary>
public static Packet dataToPacket(int linkType, byte[] bytes, Timeval tv)
{
int ethProtocol;
// record the length of the headers associated with this link layer type.
// this length is the offset to the header embedded in the packet.
lLen = LinkLayer.getLinkLayerLength(linkType);
// extract the protocol code for the type of header embedded in the
// link-layer of the packet
int offset = LinkLayer.getProtoOffset(linkType);
if (offset == -1)
{
// if there is no embedded protocol, assume IP?
ethProtocol = Packets.EthernetProtocols_Fields.IP;
}
else
{
ethProtocol = ArrayHelper.extractInteger(bytes, offset, Packets.EthernetFields.ETH_CODE_LEN);
}
// try to recognize the ethernet type..
switch (ethProtocol)
{
// arp
case Packets.EthernetProtocols_Fields.ARP:
return(new ARPPacket(lLen, bytes, tv));
case Packets.EthernetProtocols_Fields.IP:
int ipProtocol = IPProtocol.extractProtocol(lLen, bytes);
switch (ipProtocol)
{
// icmp
case Packets.IPProtocols_Fields.ICMP: return(new ICMPPacket(lLen, bytes, tv));
// igmp
case Packets.IPProtocols_Fields.IGMP: return(new IGMPPacket(lLen, bytes, tv));
// tcp
case Packets.IPProtocols_Fields.TCP: return(new TCPPacket(lLen, bytes, tv));
// udp
case Packets.IPProtocols_Fields.UDP: return(new UDPPacket(lLen, bytes, tv));
// unidentified ip..
default: return(new IPPacket(lLen, bytes, tv));
}
// ethernet level code not recognized, default to anonymous packet..
//goto default;
default: return(new EthernetPacket(lLen, bytes, tv));
}
}
/// <summary> Convert captured packet data into an object.
/// </summary>
public static Packet dataToPacket(int linkType, byte[] bytes, Timeval tv)
{
int ethProtocol;
// record the length of the headers associated with this link layer type.
// this length is the offset to the header embedded in the packet.
lLen = LinkLayer.getLinkLayerLength(linkType);
// extract the protocol code for the type of header embedded in the
// link-layer of the packet
int offset = LinkLayer.getProtoOffset(linkType);
if (offset == - 1)
// if there is no embedded protocol, assume IP?
ethProtocol = Packets.EthernetProtocols_Fields.IP;
else
ethProtocol = ArrayHelper.extractInteger(bytes, offset, Packets.EthernetFields.ETH_CODE_LEN);
// try to recognize the ethernet type..
switch (ethProtocol)
{
// arp
case Packets.EthernetProtocols_Fields.ARP:
return new ARPPacket(lLen, bytes, tv);
case Packets.EthernetProtocols_Fields.IP:
int ipProtocol = IPProtocol.extractProtocol(lLen, bytes);
switch (ipProtocol)
{
// icmp
case Packets.IPProtocols_Fields.ICMP: return new ICMPPacket(lLen, bytes, tv);
// igmp
case Packets.IPProtocols_Fields.IGMP: return new IGMPPacket(lLen, bytes, tv);
// tcp
case Packets.IPProtocols_Fields.TCP: return new TCPPacket(lLen, bytes, tv);
// udp
case Packets.IPProtocols_Fields.UDP: return new UDPPacket(lLen, bytes, tv);
// unidentified ip..
default: return new IPPacket(lLen, bytes, tv);
}
// ethernet level code not recognized, default to anonymous packet..
//goto default;
default: return new EthernetPacket(lLen, bytes, tv);
}
}
/// <summary> Create a new raw packet.
/// *
/// </summary>
/// <param name="timeval">the time the packet arrived on the device where it was
/// captured.
/// </param>
/// <param name="bytes">the raw packet data, including headers.
/// </param>
/// <param name="droplen">the number of bytes dropped (if any) when the packet
/// was captured.
///
/// </param>
public RawPacket(Timeval timeval, byte[] bytes, int droplen)
{
this.timeval = timeval;
this.bytes = bytes;
this.droplen = droplen;
}
/// <summary> Create a new TCP packet.
/// </summary>
public TCPPacket(int lLen, byte[] bytes, Timeval tv) : this(lLen, bytes)
{
this._timeval = tv;
}
/// <summary> Create a new IP packet.
/// </summary>
public IPPacket(int lLen, byte[] bytes, Timeval tv):this(lLen, bytes)
{
this._timeval = tv;
}
/// <summary> Construct a new ethernet packet, including the capture time.
/// </summary>
public EthernetPacket(int lLen, byte[] bytes, Timeval tv) : this(lLen, bytes)
{
this._timeval = tv;
}
/// <summary> Create a new raw packet.
/// *
/// </summary>
/// <param name="timeval">the time the packet arrived on the device where it was
/// captured.
/// </param>
/// <param name="bytes">the raw packet data, including headers.
/// </param>
/// <param name="droplen">the number of bytes dropped (if any) when the packet
/// was captured.
///
/// </param>
public RawPacket(Timeval timeval, byte[] bytes, int droplen)
{
this.timeval = timeval;
this.bytes = bytes;
this.droplen = droplen;
}