Class: Scriptroute::ICMPunreach

Inherits:
ICMP show all
Defined in:
lib/scriptroute/packets.rb

Overview

also handles time exceeded messages for now (same format, different code )

Constant Summary

Constants inherited from ICMP

Scriptroute::ICMP::ICMP_ECHO, Scriptroute::ICMP::ICMP_ECHOREPLY, Scriptroute::ICMP::ICMP_MASKREPLY, Scriptroute::ICMP::ICMP_MASKREQ, Scriptroute::ICMP::ICMP_PARAMETERPROB, Scriptroute::ICMP::ICMP_TIMESTAMP, Scriptroute::ICMP::ICMP_TIMESTAMPREPLY, Scriptroute::ICMP::ICMP_TIMXCEED, Scriptroute::ICMP::ICMP_UNREACH, Scriptroute::ICMP::ICMP_UNREACH_FILTER_PROHIB, Scriptroute::ICMP::ICMP_UNREACH_HOST, Scriptroute::ICMP::ICMP_UNREACH_HOST_PRECEDENCE, Scriptroute::ICMP::ICMP_UNREACH_HOST_PROHIB, Scriptroute::ICMP::ICMP_UNREACH_HOST_UNKNOWN, Scriptroute::ICMP::ICMP_UNREACH_ISOLATED, Scriptroute::ICMP::ICMP_UNREACH_NEEDFRAG, Scriptroute::ICMP::ICMP_UNREACH_NET, Scriptroute::ICMP::ICMP_UNREACH_NET_PROHIB, Scriptroute::ICMP::ICMP_UNREACH_NET_UNKNOWN, Scriptroute::ICMP::ICMP_UNREACH_PORT, Scriptroute::ICMP::ICMP_UNREACH_PRECEDENCE_CUTOFF, Scriptroute::ICMP::ICMP_UNREACH_PROTOCOL, Scriptroute::ICMP::ICMP_UNREACH_SRCFAIL, Scriptroute::ICMP::ICMP_UNREACH_TOSHOST, Scriptroute::ICMP::ICMP_UNREACH_TOSNET

Constants inherited from IPv4

Scriptroute::IPv4::IPPROTO_ICMP

Constants inherited from IP

Scriptroute::IP::IPPROTO_TCP, Scriptroute::IP::IPPROTO_UDP

Instance Attribute Summary collapse

Attributes inherited from ICMP

#icmp_cksum, #icmp_code, #icmp_type, #ip_p, #ip_payload_len

Attributes inherited from IPv4

#ip_dst, #ip_hl, #ip_id, #ip_len, #ip_off, #ip_options, #ip_p, #ip_src, #ip_sum, #ip_tos, #ip_ttl, #ip_v

Instance Method Summary collapse

Methods inherited from IPv4

#add_option, #calculate_header_len, #calculate_packet_len, creator, #ip_payload_len, #ipv4_unmarshal

Methods inherited from IP

creator, #to_bytes

Constructor Details

#initialize(string) ⇒ ICMPunreach

Can create an unreachable only from string contents, never from filling in fields given a size. param string [String] the contents of the received packet.



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# File 'lib/scriptroute/packets.rb', line 834

def initialize(string) 
  # first four are code, type, checksum.
  # second four are undefined
  @contents = IPv4.creator(string[8..-1])
  super(string)
end

Instance Attribute Details

#contents ⇒ IPv4 (readonly)

Returns The packet header embedded within the ICMP unreachable error message.

Returns:

  • (IPv4) —

    The packet header embedded within the ICMP unreachable error message.



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# File 'lib/scriptroute/packets.rb', line 827

def contents
  @contents
end

Instance Method Details

#marshal ⇒ void

This method returns an undefined value.

Cannot marshal an unreachable packet for transmission; raises an exception.



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# File 'lib/scriptroute/packets.rb', line 842

def marshal
  raise "not supported"
end

#to_s ⇒ String

Returns formats the packet and the embedded packet as a string.

Returns:

  • (String) —

    formats the packet and the embedded packet as a string.



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# File 'lib/scriptroute/packets.rb', line 846

def to_s
  super + " ( " + @contents.to_s + " )"
end