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Error rewrites (#43)

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* pcap: reuse Frame memory

* slog: reduce heap allocations of addresses; also prevent heap alloc of dhcp options in pcap

* dns: heapless improvement; add StackAsync buffer for more heapless operation; start thinking of errors

* errors: begin standardise errors in lneto

* errors: finish standardization of errors

* fix merge issues

* add more lneto errors to rest of package

* format errors.go
This commit is contained in:
Pat Whittingslow
2026-02-28 20:18:27 +01:00
committed by GitHub
parent 3d0bc93cbe
commit fa5ba918bb
38 changed files with 272 additions and 322 deletions
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dns/definitions.go
+27 -23
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@@ -3,35 +3,39 @@ package dns
import (
"encoding/binary"
"errors"
"github.com/soypat/lneto"
)
//go:generate stringer -type=Type,Class,RCode,OpCode -linecomment -output stringers.go .
// common errors. Taken from golang.org/x/net/dns/dnsmessage module.
var (
errNoResponse = errors.New("no DNS response")
errNameTooLong = errors.New("DNS name exceeds maximum length")
errNoNullTerm = errors.New("DNS name missing null terminator")
errCalcLen = errors.New("DNS calculated name label length exceeds remaining buffer length")
errCantAddLabel = errors.New("long/empty/zterm/escape DNS label or not enough space")
errBaseLen = errors.New("DNS frame length too short")
errReserved = errors.New("segment prefix is reserved")
errTooManyPtr = errors.New("too many pointers (>10)")
errInvalidPtr = errors.New("invalid pointer")
errInvalidName = errors.New("invalid dns name")
errNilResouceBody = errors.New("nil resource body")
errResourceLen = errors.New("insufficient data for resource body length")
errSegTooLong = errors.New("segment length too long")
errZeroSegLen = errors.New("zero length segment")
errResTooLong = errors.New("resource length too long")
errTooManyQuestions = errors.New("too many Questions")
errTooManyAnswers = errors.New("too many Answers")
errTooManyAuthorities = errors.New("too many Authorities")
errTooManyAdditionals = errors.New("too many Additionals")
errNonCanonicalName = errors.New("name is not in canonical format (it must end with a .)")
errStringTooLong = errors.New("character string exceeds maximum length (255)")
errCompressedSRV = errors.New("compressed name in SRV resource data")
errEmptyDomainName = errors.New("empty domain name")
errNoResponse = errors.New("no DNS response")
errNameTooLong = errors.New("DNS name exceeds maximum length")
errNoNullTerm = errors.New("DNS name missing null terminator")
errCalcLen = errors.New("DNS calculated name label length exceeds remaining buffer length")
errCantAddLabel = errors.New("long/empty/zterm/escape DNS label or not enough space")
errBaseLen = lneto.ErrShortBuffer
errReserved = errors.New("segment prefix is reserved")
errTooManyPtr = errors.New("too many pointers (>10)")
errInvalidPtr = errors.New("invalid pointer")
errInvalidName = errors.New("invalid dns name")
errNilResouceBody = errors.New("nil resource body")
errResourceLen = errors.New("insufficient data for resource body length")
errSegTooLong = errors.New("segment length too long")
errZeroSegLen = errors.New("zero length segment")
errResTooLong = errors.New("resource length too long")
errTooManyQuestions = lneto.ErrBufferFull
errTooManyAnswers = lneto.ErrBufferFull
errTooManyAuthorities = lneto.ErrBufferFull
errTooManyAdditionals = lneto.ErrBufferFull
errNonCanonicalName = errors.New("name is not in canonical format (it must end with a .)")
errStringTooLong = errors.New("character string exceeds maximum length (255)")
errCompressedSRV = errors.New("compressed name in SRV resource data")
errEmptyDomainName = errors.New("empty domain name")
)
// Frame encapsulates the raw data of a DNS packet