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all: support more $dnsrewrite rr types
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Original file line number | Diff line number | Diff line change |
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package dnsforward | ||
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import ( | ||
"encoding/base64" | ||
"net" | ||
"strconv" | ||
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"github.com/AdguardTeam/golibs/log" | ||
"github.com/AdguardTeam/urlfilter/rules" | ||
"github.com/miekg/dns" | ||
) | ||
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// genHTTPSAnswer returns a properly initialized HTTPS resource record. | ||
// | ||
// See the comment on genSVCBAnswer for a list of current restrictions on | ||
// parameter values. | ||
func (s *Server) genHTTPSAnswer(req *dns.Msg, svcb *rules.DNSSVCB) (ans *dns.HTTPS) { | ||
ans = &dns.HTTPS{ | ||
SVCB: *s.genSVCBAnswer(req, svcb), | ||
} | ||
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ans.Hdr.Rrtype = dns.TypeHTTPS | ||
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return ans | ||
} | ||
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// strToSVCBKey is the string-to-svcb-key mapping. | ||
// | ||
// See https://github.com/miekg/dns/blob/23c4faca9d32b0abbb6e179aa1aadc45ac53a916/svcb.go#L27. | ||
// | ||
// TODO(a.garipov): Propose exporting this API or something similar in the | ||
// github.com/miekg/dns module. | ||
var strToSVCBKey = map[string]dns.SVCBKey{ | ||
"alpn": dns.SVCB_ALPN, | ||
"echconfig": dns.SVCB_ECHCONFIG, | ||
"ipv4hint": dns.SVCB_IPV4HINT, | ||
"ipv6hint": dns.SVCB_IPV6HINT, | ||
"mandatory": dns.SVCB_MANDATORY, | ||
"no-default-alpn": dns.SVCB_NO_DEFAULT_ALPN, | ||
"port": dns.SVCB_PORT, | ||
} | ||
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// svcbKeyHandler is a handler for one SVCB parameter key. | ||
type svcbKeyHandler func(valStr string) (val dns.SVCBKeyValue) | ||
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// svcbKeyHandlers are the supported SVCB parameters handlers. | ||
var svcbKeyHandlers = map[string]svcbKeyHandler{ | ||
"alpn": func(valStr string) (val dns.SVCBKeyValue) { | ||
return &dns.SVCBAlpn{ | ||
Alpn: []string{valStr}, | ||
} | ||
}, | ||
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"echconfig": func(valStr string) (val dns.SVCBKeyValue) { | ||
ech, err := base64.StdEncoding.DecodeString(valStr) | ||
if err != nil { | ||
log.Debug("can't parse svcb/https echconfig: %s; ignoring", err) | ||
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return nil | ||
} | ||
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return &dns.SVCBECHConfig{ | ||
ECH: ech, | ||
} | ||
}, | ||
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"ipv4hint": func(valStr string) (val dns.SVCBKeyValue) { | ||
ip := net.ParseIP(valStr) | ||
if ip4 := ip.To4(); ip == nil || ip4 == nil { | ||
log.Debug("can't parse svcb/https ipv4 hint %q; ignoring", valStr) | ||
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return nil | ||
} | ||
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return &dns.SVCBIPv4Hint{ | ||
Hint: []net.IP{ip}, | ||
} | ||
}, | ||
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"ipv6hint": func(valStr string) (val dns.SVCBKeyValue) { | ||
ip := net.ParseIP(valStr) | ||
if ip == nil { | ||
log.Debug("can't parse svcb/https ipv6 hint %q; ignoring", valStr) | ||
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return nil | ||
} | ||
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return &dns.SVCBIPv6Hint{ | ||
Hint: []net.IP{ip}, | ||
} | ||
}, | ||
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"mandatory": func(valStr string) (val dns.SVCBKeyValue) { | ||
code, ok := strToSVCBKey[valStr] | ||
if !ok { | ||
log.Debug("unknown svcb/https mandatory key %q, ignoring", valStr) | ||
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return nil | ||
} | ||
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return &dns.SVCBMandatory{ | ||
Code: []dns.SVCBKey{code}, | ||
} | ||
}, | ||
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"no-default-alpn": func(_ string) (val dns.SVCBKeyValue) { | ||
return &dns.SVCBNoDefaultAlpn{} | ||
}, | ||
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"port": func(valStr string) (val dns.SVCBKeyValue) { | ||
port64, err := strconv.ParseUint(valStr, 10, 16) | ||
if err != nil { | ||
log.Debug("can't parse svcb/https port: %s; ignoring", err) | ||
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return nil | ||
} | ||
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return &dns.SVCBPort{ | ||
Port: uint16(port64), | ||
} | ||
}, | ||
} | ||
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// genSVCBAnswer returns a properly initialized SVCB resource record. | ||
// | ||
// Currently, there are several restrictions on how the parameters are parsed. | ||
// Firstly, the parsing of non-contiguous values isn't supported. Secondly, the | ||
// parsing of value-lists is not supported either. | ||
// | ||
// ipv4hint=127.0.0.1 // Supported. | ||
// ipv4hint="127.0.0.1" // Unsupported. | ||
// ipv4hint=127.0.0.1,127.0.0.2 // Unsupported. | ||
// ipv4hint="127.0.0.1,127.0.0.2" // Unsupported. | ||
// | ||
// TODO(a.garipov): Support all of these. | ||
func (s *Server) genSVCBAnswer(req *dns.Msg, svcb *rules.DNSSVCB) (ans *dns.SVCB) { | ||
ans = &dns.SVCB{ | ||
Hdr: s.hdr(req, dns.TypeSVCB), | ||
Priority: svcb.Priority, | ||
Target: svcb.Target, | ||
} | ||
if len(svcb.Params) == 0 { | ||
return ans | ||
} | ||
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values := make([]dns.SVCBKeyValue, 0, len(svcb.Params)) | ||
for k, valStr := range svcb.Params { | ||
handler, ok := svcbKeyHandlers[k] | ||
if !ok { | ||
log.Debug("unknown svcb/https key %q, ignoring", k) | ||
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continue | ||
} | ||
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val := handler(valStr) | ||
if val == nil { | ||
continue | ||
} | ||
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values = append(values, val) | ||
} | ||
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if len(values) > 0 { | ||
ans.Value = values | ||
} | ||
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return ans | ||
} |
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