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/**
*
*/
package io.pkts.packet;
/**
* Represents a packet from the Network Layer (layer 3). Actually, to be
* completely honest, the model implemented (at least so far) is more geared
* towards what is commonly referred to as the Internet Layer and is strictly
* speaking not quite the same as the Network Layer as specified by the OSI
* model. However, until it becomes an issue this little "issue" is going to be
* ignored and for now the Network Layer is equal to the Internet Layer.
*
* The current version of pkts.io is focused on IP anyway so...
*
* @author [email protected]
*/
public interface IPv4Packet extends IPPacket {
/**
* Setting an IPv4 address the fast way! Specify each part separately. E.g.,
* setting 192.168.0.100 would be accomplished like so:
*
* {@link #setSourceIP(192, 168, 0, 100)}
*
* @param a
* the first part of the IPv4 address, e.g. 192
* @param b
* the second part of the IPv4 address, e.g. 168
* @param c
* the third part of the IPv4 address, e.g. 0
* @param d
* the fourth part of the IPv4 address, e.g. 100
*/
void setSourceIP(int a, int b, int c, int d);
/**
* Setting an IPv4 address the fast(est?) way! Specify each part separately.
* E.g., setting 192.168.0.100 would be accomplished like so:
*
* @param rawIp
*/
void setSourceIP(byte a, byte b, byte c, byte d);
/**
* Set the source IP of this {@link IPv4Packet}. Note, using
* {@link #setSourceIP(int, int, int, int)} will be must faster so try and
* use it instead.
*
* @param sourceIp
*/
void setSourceIP(String sourceIp);
/**
* Setting an IPv4 address the fast way! Specify each part separately. E.g.,
* setting 192.168.0.100 would be accomplished like so:
*
* {@link #setSourceIP(192, 168, 0, 100)}
*
* @param a
* the first part of the IPv4 address, e.g. 192
* @param b
* the second part of the IPv4 address, e.g. 168
* @param c
* the third part of the IPv4 address, e.g. 0
* @param d
* the fourth part of the IPv4 address, e.g. 100
*/
void setDestinationIP(int a, int b, int c, int d);
void setDestinationIP(byte a, byte b, byte c, byte d);
/**
* Set the destination IP of this {@link IPv4Packet}. Note, using
* {@link #setDestinationIP(int, int, int, int)} will be must faster so try
* and use it instead.
*
* @param sourceIp
*/
void setDestinationIP(String destinationIP);
/**
* The checksum of the IP-packet. The checksum in an IP-packet is a 16 bit
* checksum of the header bytes (which the checksum set to zero) and is
* returned as a unsigned short (hence an int)
*
* Checkout
*
* @return
*/
int getIpChecksum();
/**
* After you change anything in an IP packet (apart from the payload) you
* should re-calculate the checksum. If you don't, if this then is written
* to a pcap and later opened in e.g. wireshark, then all packets will be
* flagged as bad checksums.
*/
void reCalculateChecksum();
boolean verifyIpChecksum();
@Override
IPv4Packet clone();
/**
*
* @return
*/
boolean isFragmented();
/**
* The Reserved flag is part of the three-bit flag field and those flags
* are: (in order, from high order to low order):
*
*
* bit 0: Reserved; must be zero.
* bit 1: Don't Fragment (DF)
* bit 2: More Fragments (MF)
*
*
* (source http://en.wikipedia.org/wiki/IPv4)
*
* @return should always return false
*/
boolean isReservedFlagSet();
/**
* The DF flag is part of the three-bit flag field and those flags are: (in
* order, from high order to low order):
*
*
* bit 0: Reserved; must be zero.
* bit 1: Don't Fragment (DF)
* bit 2: More Fragments (MF)
*
*
* If the DF flag is set, and fragmentation is required to route the packet,
* then the packet is dropped. This can be used when sending packets to a
* host that does not have sufficient resources to handle fragmentation. It
* can also be used for Path MTU Discovery, either automatically by the host
* IP software, or manually using diagnostic tools such as ping or
* traceroute. For unfragmented packets, the MF flag is cleared. For
* fragmented packets, all fragments except the last have the MF flag set.
* The last fragment has a non-zero Fragment Offset field, differentiating
* it from an unfragmented packet.
*
* (source http://en.wikipedia.org/wiki/IPv4)
*
* @return
*/
boolean isDontFragmentSet();
/**
* The MF flag is part of the three-bit flag field and those flags are: (in
* order, from high order to low order):
*
*
* bit 0: Reserved; must be zero.
* bit 1: Don't Fragment (DF)
* bit 2: More Fragments (MF)
*
*
* If the DF flag is set, and fragmentation is required to route the packet,
* then the packet is dropped. This can be used when sending packets to a
* host that does not have sufficient resources to handle fragmentation. It
* can also be used for Path MTU Discovery, either automatically by the host
* IP software, or manually using diagnostic tools such as ping or
* traceroute. For unfragmented packets, the MF flag is cleared. For
* fragmented packets, all fragments except the last have the MF flag set.
* The last fragment has a non-zero Fragment Offset field, differentiating
* it from an unfragmented packet.
*
* (source http://en.wikipedia.org/wiki/IPv4)
*
* @return
*/
boolean isMoreFragmentsSet();
/**
* The fragment offset field, measured in units of eight-byte blocks, is 13
* bits long and specifies the offset of a particular fragment relative to
* the beginning of the original unfragmented IP datagram. The first
* fragment has an offset of zero. This allows a maximum offset of (213 – 1)
* × 8 = 65,528 bytes, which would exceed the maximum IP packet length of
* 65,535 bytes with the header length included (65,528 + 20 = 65,548
* bytes).
*
* (source http://en.wikipedia.org/wiki/IPv4)
*
* @return
*/
short getFragmentOffset();
}
