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fq/format/inet/icmp.go

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package inet
import (
"github.com/wader/fq/format"
"github.com/wader/fq/format/registry"
"github.com/wader/fq/pkg/decode"
"github.com/wader/fq/pkg/scalar"
)
func init() {
registry.MustRegister(decode.Format{
Name: format.ICMP,
Description: "Internet Control Message Protocol",
DecodeFn: decodeICMP,
})
}
// based on https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol
var icmpTypeMap = scalar.UToScalar{
0: {Sym: "echo_reply", Description: "Echo reply"},
3: {Sym: "unreachable", Description: "Destination network unreachable"},
4: {Sym: "source_quench", Description: "Source quench (congestion control)"},
5: {Sym: "redirect", Description: "Redirect Datagram for the Network"},
6: {Description: "Alternate Host Address"},
8: {Sym: "echo_request", Description: "Echo request"},
9: {Sym: "router_advertisement", Description: "Router Advertisement"},
10: {Sym: "router_solicitation", Description: "Router discovery/selection/solicitation"},
11: {Sym: "time_exceeded", Description: "TTL expired in transit"},
12: {Sym: "parameter_problem", Description: "Pointer indicates the error"},
13: {Sym: "timestamp", Description: "Timestamp"},
14: {Sym: "timestamp_reply", Description: "Timestamp reply"},
15: {Sym: "information_request", Description: "Information Request"},
16: {Sym: "information_reply", Description: "Information Reply"},
17: {Sym: "address_mask_request", Description: "Address Mask Request"},
18: {Sym: "address_mask_reply", Description: "Address Mask Reply"},
30: {Sym: "traceroute", Description: "Information Request"},
31: {Description: "Datagram Conversion Error"},
32: {Description: "Mobile Host Redirect"},
33: {Description: "Where-Are-You (originally meant for IPv6)"},
34: {Description: "Here-I-Am (originally meant for IPv6)"},
35: {Description: "Mobile Registration Request"},
36: {Description: "Mobile Registration Reply"},
37: {Description: "Domain Name Request"},
38: {Description: "Domain Name Reply"},
39: {Description: "Simple Key-Management for Internet Protocol"},
40: {Sym: "photuris"},
41: {Description: "Experimental icmp for experimental mobility protocols"},
42: {Sym: "extended_echo_request", Description: "Request Extended Echo"},
43: {Sym: "extended_echo_reply", Description: "No Error"},
}
var icmpCodeMapMap = map[uint64]scalar.UToScalar{
3: {
1: {Description: "Destination host unreachable"},
2: {Description: "Destination protocol unreachable"},
3: {Description: "Destination port unreachable"},
4: {Description: "Fragmentation required, and DF flag set"},
5: {Description: "Source route failed"},
6: {Description: "Destination network unknown"},
7: {Description: "Destination host unknown"},
8: {Description: "Source host isolated"},
9: {Description: "Network administratively prohibited"},
10: {Description: "Host administratively prohibited"},
11: {Description: "Network unreachable for ToS"},
12: {Description: "Host unreachable for ToS"},
13: {Description: "Communication administratively prohibited"},
14: {Description: "Host Precedence Violation"},
15: {Description: "Precedence cutoff in effect"},
},
5: {
0: {Description: "Redirect Datagram for the Network"},
1: {Description: "Redirect Datagram for the Host"},
2: {Description: "Redirect Datagram for the ToS & network"},
3: {Description: "Redirect Datagram for the ToS & host"},
},
11: {
0: {Description: "TTL expired in transit"},
1: {Description: "Fragment reassembly time exceeded"},
},
12: {
0: {Description: "Pointer indicates the error"},
1: {Description: "Missing a required option"},
2: {Description: "Bad length"},
},
43: {
0: {Description: "No Error"},
1: {Description: "Malformed Query"},
2: {Description: "No Such Interface"},
3: {Description: "No Such Table Entry"},
4: {Description: "Multiple Interfaces Satisfy Query"},
},
}
func decodeICMP(d *decode.D, in interface{}) interface{} {
typ := d.FieldU8("type", icmpTypeMap)
d.FieldU8("code", icmpCodeMapMap[typ])
d.FieldU16("checksum")
d.FieldRawLen("content", d.BitsLeft())
return nil
}