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-rw-r--r--pkg/tcpip/header/ndp_options.go213
-rw-r--r--pkg/tcpip/header/ndp_test.go574
2 files changed, 787 insertions, 0 deletions
diff --git a/pkg/tcpip/header/ndp_options.go b/pkg/tcpip/header/ndp_options.go
index 444e90820..5d3975c56 100644
--- a/pkg/tcpip/header/ndp_options.go
+++ b/pkg/tcpip/header/ndp_options.go
@@ -45,6 +45,10 @@ const (
// NDPRecursiveDNSServerOptionType is the type of the Recursive DNS
// Server option, as per RFC 8106 section 5.1.
NDPRecursiveDNSServerOptionType NDPOptionIdentifier = 25
+
+ // NDPDNSSearchListOptionType is the type of the DNS Search List option,
+ // as per RFC 8106 section 5.2.
+ NDPDNSSearchListOptionType = 31
)
const (
@@ -115,6 +119,27 @@ const (
// RFC 8106 section 5.3.1.
minNDPRecursiveDNSServerBodySize = 22
+ // ndpDNSSearchListLifetimeOffset is the start of the 4-byte
+ // Lifetime field within an NDPDNSSearchList.
+ ndpDNSSearchListLifetimeOffset = 2
+
+ // ndpDNSSearchListDomainNamesOffset is the start of the DNS search list
+ // domain names within an NDPDNSSearchList.
+ ndpDNSSearchListDomainNamesOffset = 6
+
+ // minNDPDNSSearchListBodySize is the minimum NDP DNS Search List option's
+ // body size when it contains at least one domain name, as per RFC 8106
+ // section 5.3.1.
+ minNDPDNSSearchListBodySize = 14
+
+ // maxDomainNameLabelLength is the maximum length of a domain name
+ // label, as per RFC 1035 section 3.1.
+ maxDomainNameLabelLength = 63
+
+ // maxDomainNameLength is the maximum length of a domain name, including
+ // label AND label length octet, as per RFC 1035 section 3.1.
+ maxDomainNameLength = 255
+
// lengthByteUnits is the multiplier factor for the Length field of an
// NDP option. That is, the length field for NDP options is in units of
// 8 octets, as per RFC 4861 section 4.6.
@@ -224,6 +249,14 @@ func (i *NDPOptionIterator) Next() (NDPOption, bool, error) {
return opt, false, nil
+ case NDPDNSSearchListOptionType:
+ opt := NDPDNSSearchList(body)
+ if err := opt.checkDomainNames(); err != nil {
+ return nil, true, err
+ }
+
+ return opt, false, nil
+
default:
// We do not yet recognize the option, just skip for
// now. This is okay because RFC 4861 allows us to
@@ -684,3 +717,183 @@ func (o NDPRecursiveDNSServer) iterAddresses(fn func(tcpip.Address)) error {
return nil
}
+
+// NDPDNSSearchList is the NDP DNS Search List option, as defined by
+// RFC 8106 section 5.2.
+type NDPDNSSearchList []byte
+
+// Type implements NDPOption.Type.
+func (o NDPDNSSearchList) Type() NDPOptionIdentifier {
+ return NDPDNSSearchListOptionType
+}
+
+// Length implements NDPOption.Length.
+func (o NDPDNSSearchList) Length() int {
+ return len(o)
+}
+
+// serializeInto implements NDPOption.serializeInto.
+func (o NDPDNSSearchList) serializeInto(b []byte) int {
+ used := copy(b, o)
+
+ // Zero out the reserved bytes that are before the Lifetime field.
+ for i := 0; i < ndpDNSSearchListLifetimeOffset; i++ {
+ b[i] = 0
+ }
+
+ return used
+}
+
+// String implements fmt.Stringer.String.
+func (o NDPDNSSearchList) String() string {
+ lt := o.Lifetime()
+ domainNames, err := o.DomainNames()
+ if err != nil {
+ return fmt.Sprintf("%T([] valid for %s; err = %s)", o, lt, err)
+ }
+ return fmt.Sprintf("%T(%s valid for %s)", o, domainNames, lt)
+}
+
+// Lifetime returns the length of time that the DNS search list of domain names
+// in this option may be used for name resolution.
+//
+// Note, a value of 0 implies the domain names should no longer be used,
+// and a value of infinity/forever is represented by NDPInfiniteLifetime.
+func (o NDPDNSSearchList) Lifetime() time.Duration {
+ // The field is the time in seconds, as per RFC 8106 section 5.1.
+ return time.Second * time.Duration(binary.BigEndian.Uint32(o[ndpDNSSearchListLifetimeOffset:]))
+}
+
+// DomainNames returns a DNS search list of domain names.
+//
+// DomainNames will parse the backing buffer as outlined by RFC 1035 section
+// 3.1 and return a list of strings, with all domain names in lower case.
+func (o NDPDNSSearchList) DomainNames() ([]string, error) {
+ var domainNames []string
+ return domainNames, o.iterDomainNames(func(domainName string) { domainNames = append(domainNames, domainName) })
+}
+
+// checkDomainNames iterates over the domain names in an NDP DNS Search List
+// option and returns any error it encounters.
+func (o NDPDNSSearchList) checkDomainNames() error {
+ return o.iterDomainNames(nil)
+}
+
+// iterDomainNames iterates over the domain names in an NDP DNS Search List
+// option and calls a function with each valid domain name.
+func (o NDPDNSSearchList) iterDomainNames(fn func(string)) error {
+ if l := len(o); l < minNDPDNSSearchListBodySize {
+ return fmt.Errorf("got %d bytes for NDP DNS Search List option's body, expected at least %d bytes: %w", l, minNDPDNSSearchListBodySize, io.ErrUnexpectedEOF)
+ }
+
+ var searchList bytes.Reader
+ searchList.Reset(o[ndpDNSSearchListDomainNamesOffset:])
+
+ var scratch [maxDomainNameLength]byte
+ domainName := bytes.NewBuffer(scratch[:])
+
+ // Parse the domain names, as per RFC 1035 section 3.1.
+ for searchList.Len() != 0 {
+ domainName.Reset()
+
+ // Parse a label within a domain name, as per RFC 1035 section 3.1.
+ for {
+ // The first byte is the label length.
+ labelLenByte, err := searchList.ReadByte()
+ if err != nil {
+ if err != io.EOF {
+ // ReadByte should only ever return nil or io.EOF.
+ panic(fmt.Sprintf("unexpected error when reading a label's length: %s", err))
+ }
+
+ // We use io.ErrUnexpectedEOF as exhausting the buffer is unexpected
+ // once we start parsing a domain name; we expect the buffer to contain
+ // enough bytes for the whole domain name.
+ return fmt.Errorf("unexpected exhausted buffer while parsing a new label for a domain from NDP Search List option: %w", io.ErrUnexpectedEOF)
+ }
+ labelLen := int(labelLenByte)
+
+ // A zero-length label implies the end of a domain name.
+ if labelLen == 0 {
+ // If the domain name is empty or we have no callback function, do
+ // nothing further with the current domain name.
+ if domainName.Len() == 0 || fn == nil {
+ break
+ }
+
+ // Ignore the trailing period in the parsed domain name.
+ domainName.Truncate(domainName.Len() - 1)
+ fn(domainName.String())
+ break
+ }
+
+ // The label's length must not exceed the maximum length for a label.
+ if labelLen > maxDomainNameLabelLength {
+ return fmt.Errorf("label length of %d bytes is greater than the max label length of %d bytes for an NDP Search List option: %w", labelLen, maxDomainNameLabelLength, ErrNDPOptMalformedBody)
+ }
+
+ // The label (and trailing period) must not make the domain name too long.
+ if labelLen+1 > domainName.Cap()-domainName.Len() {
+ return fmt.Errorf("label would make an NDP Search List option's domain name longer than the max domain name length of %d bytes: %w", maxDomainNameLength, ErrNDPOptMalformedBody)
+ }
+
+ // Copy the label and add a trailing period.
+ for i := 0; i < labelLen; i++ {
+ b, err := searchList.ReadByte()
+ if err != nil {
+ if err != io.EOF {
+ panic(fmt.Sprintf("unexpected error when reading domain name's label: %s", err))
+ }
+
+ return fmt.Errorf("read %d out of %d bytes for a domain name's label from NDP Search List option: %w", i, labelLen, io.ErrUnexpectedEOF)
+ }
+
+ // As per RFC 1035 section 2.3.1:
+ // 1) the label must only contain ASCII include letters, digits and
+ // hyphens
+ // 2) the first character in a label must be a letter
+ // 3) the last letter in a label must be a letter or digit
+
+ if !isLetter(b) {
+ if i == 0 {
+ return fmt.Errorf("first character of a domain name's label in an NDP Search List option must be a letter, got character code = %d: %w", b, ErrNDPOptMalformedBody)
+ }
+
+ if b == '-' {
+ if i == labelLen-1 {
+ return fmt.Errorf("last character of a domain name's label in an NDP Search List option must not be a hyphen (-): %w", ErrNDPOptMalformedBody)
+ }
+ } else if !isDigit(b) {
+ return fmt.Errorf("domain name's label in an NDP Search List option may only contain letters, digits and hyphens, got character code = %d: %w", b, ErrNDPOptMalformedBody)
+ }
+ }
+
+ // If b is an upper case character, make it lower case.
+ if isUpperLetter(b) {
+ b = b - 'A' + 'a'
+ }
+
+ if err := domainName.WriteByte(b); err != nil {
+ panic(fmt.Sprintf("unexpected error writing label to domain name buffer: %s", err))
+ }
+ }
+ if err := domainName.WriteByte('.'); err != nil {
+ panic(fmt.Sprintf("unexpected error writing trailing period to domain name buffer: %s", err))
+ }
+ }
+ }
+
+ return nil
+}
+
+func isLetter(b byte) bool {
+ return b >= 'a' && b <= 'z' || isUpperLetter(b)
+}
+
+func isUpperLetter(b byte) bool {
+ return b >= 'A' && b <= 'Z'
+}
+
+func isDigit(b byte) bool {
+ return b >= '0' && b <= '9'
+}
diff --git a/pkg/tcpip/header/ndp_test.go b/pkg/tcpip/header/ndp_test.go
index 2341329c4..dc4591253 100644
--- a/pkg/tcpip/header/ndp_test.go
+++ b/pkg/tcpip/header/ndp_test.go
@@ -17,7 +17,9 @@ package header
import (
"bytes"
"errors"
+ "fmt"
"io"
+ "regexp"
"testing"
"time"
@@ -667,6 +669,477 @@ func TestNDPRecursiveDNSServerOption(t *testing.T) {
}
}
+// TestNDPDNSSearchListOption tests the getters of NDPDNSSearchList.
+func TestNDPDNSSearchListOption(t *testing.T) {
+ tests := []struct {
+ name string
+ buf []byte
+ lifetime time.Duration
+ domainNames []string
+ err error
+ }{
+ {
+ name: "Valid1Label",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 1,
+ 3, 'a', 'b', 'c',
+ 0,
+ 0, 0, 0,
+ },
+ lifetime: time.Second,
+ domainNames: []string{
+ "abc",
+ },
+ err: nil,
+ },
+ {
+ name: "Valid2Label",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 5,
+ 3, 'a', 'b', 'c',
+ 4, 'a', 'b', 'c', 'd',
+ 0,
+ 0, 0, 0, 0, 0, 0,
+ },
+ lifetime: 5 * time.Second,
+ domainNames: []string{
+ "abc.abcd",
+ },
+ err: nil,
+ },
+ {
+ name: "Valid3Label",
+ buf: []byte{
+ 0, 0,
+ 1, 0, 0, 0,
+ 3, 'a', 'b', 'c',
+ 4, 'a', 'b', 'c', 'd',
+ 1, 'e',
+ 0,
+ 0, 0, 0, 0,
+ },
+ lifetime: 16777216 * time.Second,
+ domainNames: []string{
+ "abc.abcd.e",
+ },
+ err: nil,
+ },
+ {
+ name: "Valid2Domains",
+ buf: []byte{
+ 0, 0,
+ 1, 2, 3, 4,
+ 3, 'a', 'b', 'c',
+ 0,
+ 2, 'd', 'e',
+ 3, 'x', 'y', 'z',
+ 0,
+ 0, 0, 0,
+ },
+ lifetime: 16909060 * time.Second,
+ domainNames: []string{
+ "abc",
+ "de.xyz",
+ },
+ err: nil,
+ },
+ {
+ name: "Valid3DomainsMixedCase",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 3, 'a', 'B', 'c',
+ 0,
+ 2, 'd', 'E',
+ 3, 'X', 'y', 'z',
+ 0,
+ 1, 'J',
+ 0,
+ },
+ lifetime: 0,
+ domainNames: []string{
+ "abc",
+ "de.xyz",
+ "j",
+ },
+ err: nil,
+ },
+ {
+ name: "ValidDomainAfterNULL",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 3, 'a', 'B', 'c',
+ 0, 0, 0, 0,
+ 2, 'd', 'E',
+ 3, 'X', 'y', 'z',
+ 0,
+ },
+ lifetime: 0,
+ domainNames: []string{
+ "abc",
+ "de.xyz",
+ },
+ err: nil,
+ },
+ {
+ name: "Valid0Domains",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 0,
+ 0, 0, 0, 0, 0, 0, 0,
+ },
+ lifetime: 0,
+ domainNames: nil,
+ err: nil,
+ },
+ {
+ name: "NoTrailingNull",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 7, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
+ },
+ lifetime: 0,
+ domainNames: nil,
+ err: io.ErrUnexpectedEOF,
+ },
+ {
+ name: "IncorrectLength",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 8, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
+ },
+ lifetime: 0,
+ domainNames: nil,
+ err: io.ErrUnexpectedEOF,
+ },
+ {
+ name: "IncorrectLengthWithNULL",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 7, 'a', 'b', 'c', 'd', 'e', 'f',
+ 0,
+ },
+ lifetime: 0,
+ domainNames: nil,
+ err: ErrNDPOptMalformedBody,
+ },
+ {
+ name: "LabelOfLength63",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 0,
+ },
+ lifetime: 0,
+ domainNames: []string{
+ "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk",
+ },
+ err: nil,
+ },
+ {
+ name: "LabelOfLength64",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 64, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l',
+ 0,
+ },
+ lifetime: 0,
+ domainNames: nil,
+ err: ErrNDPOptMalformedBody,
+ },
+ {
+ name: "DomainNameOfLength255",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 62, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j',
+ 0,
+ },
+ lifetime: 0,
+ domainNames: []string{
+ "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghij",
+ },
+ err: nil,
+ },
+ {
+ name: "DomainNameOfLength256",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 0,
+ },
+ lifetime: 0,
+ domainNames: nil,
+ err: ErrNDPOptMalformedBody,
+ },
+ {
+ name: "StartingDigitForLabel",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 1,
+ 3, '9', 'b', 'c',
+ 0,
+ 0, 0, 0,
+ },
+ lifetime: time.Second,
+ domainNames: nil,
+ err: ErrNDPOptMalformedBody,
+ },
+ {
+ name: "StartingHyphenForLabel",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 1,
+ 3, '-', 'b', 'c',
+ 0,
+ 0, 0, 0,
+ },
+ lifetime: time.Second,
+ domainNames: nil,
+ err: ErrNDPOptMalformedBody,
+ },
+ {
+ name: "EndingHyphenForLabel",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 1,
+ 3, 'a', 'b', '-',
+ 0,
+ 0, 0, 0,
+ },
+ lifetime: time.Second,
+ domainNames: nil,
+ err: ErrNDPOptMalformedBody,
+ },
+ {
+ name: "EndingDigitForLabel",
+ buf: []byte{
+ 0, 0,
+ 0, 0, 0, 1,
+ 3, 'a', 'b', '9',
+ 0,
+ 0, 0, 0,
+ },
+ lifetime: time.Second,
+ domainNames: []string{
+ "ab9",
+ },
+ err: nil,
+ },
+ }
+
+ for _, test := range tests {
+ t.Run(test.name, func(t *testing.T) {
+ opt := NDPDNSSearchList(test.buf)
+
+ if got := opt.Lifetime(); got != test.lifetime {
+ t.Errorf("got Lifetime = %d, want = %d", got, test.lifetime)
+ }
+ domainNames, err := opt.DomainNames()
+ if !errors.Is(err, test.err) {
+ t.Errorf("opt.DomainNames() = %s", err)
+ }
+ if diff := cmp.Diff(domainNames, test.domainNames); diff != "" {
+ t.Errorf("mismatched domain names (-want +got):\n%s", diff)
+ }
+ })
+ }
+}
+
+func TestNDPSearchListOptionDomainNameLabelInvalidSymbols(t *testing.T) {
+ for r := rune(0); r <= 255; r++ {
+ t.Run(fmt.Sprintf("RuneVal=%d", r), func(t *testing.T) {
+ buf := []byte{
+ 0, 0,
+ 0, 0, 0, 0,
+ 3, 'a', 0 /* will be replaced */, 'c',
+ 0,
+ 0, 0, 0,
+ }
+ buf[8] = uint8(r)
+ opt := NDPDNSSearchList(buf)
+
+ // As per RFC 1035 section 2.3.1, the label must only include ASCII
+ // letters, digits and hyphens (a-z, A-Z, 0-9, -).
+ var expectedErr error
+ re := regexp.MustCompile(`[a-zA-Z0-9-]`)
+ if !re.Match([]byte{byte(r)}) {
+ expectedErr = ErrNDPOptMalformedBody
+ }
+
+ if domainNames, err := opt.DomainNames(); !errors.Is(err, expectedErr) {
+ t.Errorf("got opt.DomainNames() = (%s, %v), want = (_, %v)", domainNames, err, ErrNDPOptMalformedBody)
+ }
+ })
+ }
+}
+
+func TestNDPDNSSearchListOptionSerialize(t *testing.T) {
+ b := []byte{
+ 9, 8,
+ 1, 0, 0, 0,
+ 3, 'a', 'b', 'c',
+ 4, 'a', 'b', 'c', 'd',
+ 1, 'e',
+ 0,
+ }
+ targetBuf := []byte{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
+ expected := []byte{
+ 31, 3, 0, 0,
+ 1, 0, 0, 0,
+ 3, 'a', 'b', 'c',
+ 4, 'a', 'b', 'c', 'd',
+ 1, 'e',
+ 0,
+ 0, 0, 0, 0,
+ }
+ opts := NDPOptions(targetBuf)
+ serializer := NDPOptionsSerializer{
+ NDPDNSSearchList(b),
+ }
+ if got, want := opts.Serialize(serializer), len(expected); got != want {
+ t.Errorf("got Serialize = %d, want = %d", got, want)
+ }
+ if !bytes.Equal(targetBuf, expected) {
+ t.Fatalf("got targetBuf = %x, want = %x", targetBuf, expected)
+ }
+
+ it, err := opts.Iter(true)
+ if err != nil {
+ t.Fatalf("got Iter = (_, %s), want = (_, nil)", err)
+ }
+
+ next, done, err := it.Next()
+ if err != nil {
+ t.Fatalf("got Next = (_, _, %s), want = (_, _, nil)", err)
+ }
+ if done {
+ t.Fatal("got Next = (_, true, _), want = (_, false, _)")
+ }
+ if got := next.Type(); got != NDPDNSSearchListOptionType {
+ t.Errorf("got Type = %d, want = %d", got, NDPDNSSearchListOptionType)
+ }
+
+ opt, ok := next.(NDPDNSSearchList)
+ if !ok {
+ t.Fatalf("next (type = %T) cannot be casted to an NDPDNSSearchList", next)
+ }
+ if got := opt.Type(); got != 31 {
+ t.Errorf("got Type = %d, want = 31", got)
+ }
+ if got := opt.Length(); got != 22 {
+ t.Errorf("got Length = %d, want = 22", got)
+ }
+ if got, want := opt.Lifetime(), 16777216*time.Second; got != want {
+ t.Errorf("got Lifetime = %s, want = %s", got, want)
+ }
+ domainNames, err := opt.DomainNames()
+ if err != nil {
+ t.Errorf("opt.DomainNames() = %s", err)
+ }
+ if diff := cmp.Diff(domainNames, []string{"abc.abcd.e"}); diff != "" {
+ t.Errorf("domain names mismatch (-want +got):\n%s", diff)
+ }
+
+ // Iterator should not return anything else.
+ next, done, err = it.Next()
+ if err != nil {
+ t.Errorf("got Next = (_, _, %s), want = (_, _, nil)", err)
+ }
+ if !done {
+ t.Error("got Next = (_, false, _), want = (_, true, _)")
+ }
+ if next != nil {
+ t.Errorf("got Next = (%x, _, _), want = (nil, _, _)", next)
+ }
+}
+
// TestNDPOptionsIterCheck tests that Iter will return false if the NDPOptions
// the iterator was returned for is malformed.
func TestNDPOptionsIterCheck(t *testing.T) {
@@ -832,6 +1305,107 @@ func TestNDPOptionsIterCheck(t *testing.T) {
},
expectedErr: ErrNDPOptMalformedBody,
},
+ {
+ name: "DNSSearchListLargeCompliantRFC1035",
+ buf: []byte{
+ 31, 33, 0, 0,
+ 0, 0, 0, 0,
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 62, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j',
+ 0,
+ },
+ expectedErr: nil,
+ },
+ {
+ name: "DNSSearchListNonCompliantRFC1035",
+ buf: []byte{
+ 31, 33, 0, 0,
+ 0, 0, 0, 0,
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 63, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
+ 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+ 'i', 'j', 'k',
+ 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ },
+ expectedErr: ErrNDPOptMalformedBody,
+ },
+ {
+ name: "DNSSearchListValidSmall",
+ buf: []byte{
+ 31, 2, 0, 0,
+ 0, 0, 0, 0,
+ 6, 'a', 'b', 'c', 'd', 'e', 'f',
+ 0,
+ },
+ expectedErr: nil,
+ },
+ {
+ name: "DNSSearchListTooSmall",
+ buf: []byte{
+ 31, 1, 0, 0,
+ 0, 0, 0,
+ },
+ expectedErr: io.ErrUnexpectedEOF,
+ },
}
for _, test := range tests {
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-02 17:19:13 +0000