Feature/attack/log4shell

[Abdiiir]

• Added log4shell attack to exploit attacks arsenal with unit tests. A description of the attack is included as a commit message.

The functions created in Base attack are documented with examples

• Add update_seq_ack() to update sequence or acknowledgment numbers

  • Example: update_seq_ack(tcp_pkt, 10, True) updates tcp_pkt's sequence number by 10 (assumes packet is in source direction)

• Add update_ip_packet_len_and_checksums() to update IP packet length and reset checksums

  • Example: update_ip_packet_len_and_checksums(ip_pkt) updates ip_pkt's length and resets its checksums

• Add get_unique_random_ephemeral_port() to generate unique ephemeral ports

  • Example: get_unique_random_ephemeral_port(40000, 50000, {45000}) returns a unique port within 40000-50000 range excluding 45000