mirror of
https://github.com/wader/fq.git
synced 2024-11-23 18:56:52 +03:00
b08ef00dd1
Replaces []Format with a Group type. A bit more type safe. Breaking change for RegisterFormat, now takes a first argument that is a "single" format group. Lots of naming cleanup. This is also preparation for decode group argument which will enable doing intresting probing, ex a format decoder could know it's decode as part of probe group (html could be probed possibly), or have "arg probe" group for decoder who inspect args to know if they should probe (-d /path/to/schema etc) to enable nice CLI-ergonomics.
109 lines
3.8 KiB
Go
109 lines
3.8 KiB
Go
package inet
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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)
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func init() {
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interp.RegisterFormat(
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format.Icmp,
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&decode.Format{
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Description: "Internet Control Message Protocol",
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Groups: []*decode.Group{format.IpPacket},
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DecodeFn: decodeICMP,
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})
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}
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// based on https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol
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var icmpTypeMap = scalar.UintMap{
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0: {Sym: "echo_reply", Description: "Echo reply"},
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3: {Sym: "unreachable", Description: "Destination network unreachable"},
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4: {Sym: "source_quench", Description: "Source quench (congestion control)"},
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5: {Sym: "redirect", Description: "Redirect Datagram for the Network"},
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6: {Description: "Alternate Host Address"},
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8: {Sym: "echo_request", Description: "Echo request"},
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9: {Sym: "router_advertisement", Description: "Router Advertisement"},
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10: {Sym: "router_solicitation", Description: "Router discovery/selection/solicitation"},
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11: {Sym: "time_exceeded", Description: "TTL expired in transit"},
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12: {Sym: "parameter_problem", Description: "Pointer indicates the error"},
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13: {Sym: "timestamp", Description: "Timestamp"},
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14: {Sym: "timestamp_reply", Description: "Timestamp reply"},
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15: {Sym: "information_request", Description: "Information Request"},
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16: {Sym: "information_reply", Description: "Information Reply"},
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17: {Sym: "address_mask_request", Description: "Address Mask Request"},
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18: {Sym: "address_mask_reply", Description: "Address Mask Reply"},
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30: {Sym: "traceroute", Description: "Information Request"},
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31: {Description: "Datagram Conversion Error"},
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32: {Description: "Mobile Host Redirect"},
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33: {Description: "Where-Are-You (originally meant for IPv6)"},
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34: {Description: "Here-I-Am (originally meant for IPv6)"},
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35: {Description: "Mobile Registration Request"},
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36: {Description: "Mobile Registration Reply"},
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37: {Description: "Domain Name Request"},
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38: {Description: "Domain Name Reply"},
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39: {Description: "Simple Key-Management for Internet Protocol"},
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40: {Sym: "photuris"},
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41: {Description: "Experimental icmp for experimental mobility protocols"},
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42: {Sym: "extended_echo_request", Description: "Request Extended Echo"},
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43: {Sym: "extended_echo_reply", Description: "No Error"},
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}
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var icmpCodeMapMap = map[uint64]scalar.UintMapDescription{
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3: {
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1: "Destination host unreachable",
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2: "Destination protocol unreachable",
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3: "Destination port unreachable",
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4: "Fragmentation required, and DF flag set",
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5: "Source route failed",
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6: "Destination network unknown",
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7: "Destination host unknown",
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8: "Source host isolated",
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9: "Network administratively prohibited",
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10: "Host administratively prohibited",
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11: "Network unreachable for ToS",
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12: "Host unreachable for ToS",
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13: "Communication administratively prohibited",
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14: "Host Precedence Violation",
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15: "Precedence cutoff in effect",
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},
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5: {
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0: "Redirect Datagram for the Network",
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1: "Redirect Datagram for the Host",
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2: "Redirect Datagram for the ToS & network",
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3: "Redirect Datagram for the ToS & host",
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},
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11: {
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0: "TTL expired in transit",
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1: "Fragment reassembly time exceeded",
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},
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12: {
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0: "Pointer indicates the error",
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1: "Missing a required option",
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2: "Bad length",
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},
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43: {
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0: "No Error",
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1: "Malformed Query",
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2: "No Such Interface",
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3: "No Such Table Entry",
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4: "Multiple Interfaces Satisfy Query",
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},
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}
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func decodeICMP(d *decode.D) any {
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var ipi format.IPPacketIn
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if d.ArgAs(&ipi) && ipi.Protocol != format.IPv4ProtocolICMP {
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d.Fatalf("incorrect protocol %d", ipi.Protocol)
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}
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typ := d.FieldU8("type", icmpTypeMap)
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d.FieldU8("code", icmpCodeMapMap[typ])
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d.FieldU16("checksum")
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d.FieldRawLen("content", d.BitsLeft())
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return nil
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}
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