114 lines
2.3 KiB
Go
114 lines
2.3 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package util
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import (
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"fmt"
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"net"
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"git.froth.zone/sam/awl/logawl"
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"github.com/miekg/dns"
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)
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// Options is the grand CLI options structure.
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type Options struct {
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Logger *logawl.Logger
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TLSHost string
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EDNS
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Request Request
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Port int
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Verbosity int
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Display Displays
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TC bool
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ShowTTL bool
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ShowQuery bool
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AA bool
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AD bool
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CD bool
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QR bool
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RD bool
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RA bool
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IPv4 bool
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Z bool
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Reverse bool
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HumanTTL bool
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Truncate bool
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Short bool
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Identify bool
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JSON bool
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XML bool
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YAML bool
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QUIC bool
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HTTPS bool
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TLSNoVerify bool
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TLS bool
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DNSCrypt bool
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TCP bool
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IPv6 bool
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}
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// Displays contains toggles for what to (and not to) display.
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type Displays struct {
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Comments bool
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Question bool // QUESTION SECTION
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Opt bool // OPT PSEUDOSECTION
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Answer bool // ANSWER SECTION
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Authority bool // AUTHORITY SECTION
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Additional bool // ADDITIONAL SECTION
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Statistics bool // Query time, message size, etc.
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UcodeTranslate bool // Translate Punycode back to Unicode
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}
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// EDNS contains toggles for various EDNS options.
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type EDNS struct {
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Subnet dns.EDNS0_SUBNET
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ZFlag uint16
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BufSize uint16
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EnableEDNS bool
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Cookie bool
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DNSSEC bool
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Expire bool
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KeepOpen bool
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Nsid bool
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Padding bool
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Version uint8
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}
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// ParseSubnet takes a subnet argument and makes it into one that the DNS library
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// understands.
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func ParseSubnet(subnet string, opts *Options) error {
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ip, inet, err := net.ParseCIDR(subnet)
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if err != nil {
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// TODO: make not a default?
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if subnet == "0" {
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opts.EDNS.Subnet = dns.EDNS0_SUBNET{
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Code: dns.EDNS0SUBNET,
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Family: 1,
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SourceNetmask: 0,
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SourceScope: 0,
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Address: net.IPv4(0, 0, 0, 0),
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}
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return nil
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}
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return fmt.Errorf("EDNS subnet parsing: %w", err)
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}
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sub, _ := inet.Mask.Size()
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opts.EDNS.Subnet = dns.EDNS0_SUBNET{}
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opts.EDNS.Subnet.Address = ip
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opts.EDNS.Subnet.SourceNetmask = uint8(sub)
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switch ip.To4() {
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case nil:
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// Not a valid IPv4 so assume IPv6
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opts.EDNS.Subnet.Family = 2
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default:
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// Valid IPv4
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opts.EDNS.Subnet.Family = 1
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}
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return nil
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}
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