99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
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package ldap
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import (
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"errors"
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"fmt"
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ber "github.com/go-asn1-ber/asn1-ber"
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)
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var (
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errRespChanClosed = errors.New("ldap: response channel closed")
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errCouldNotRetMsg = errors.New("ldap: could not retrieve message")
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ErrNilConnection = errors.New("ldap: conn is nil, expected net.Conn")
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)
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type request interface {
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appendTo(*ber.Packet) error
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}
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type requestFunc func(*ber.Packet) error
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func (f requestFunc) appendTo(p *ber.Packet) error {
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return f(p)
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}
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func (l *Conn) doRequest(req request) (*messageContext, error) {
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if l == nil || l.conn == nil {
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return nil, ErrNilConnection
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}
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packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
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packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
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if err := req.appendTo(packet); err != nil {
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return nil, err
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}
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if l.Debug {
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l.Debug.PrintPacket(packet)
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}
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msgCtx, err := l.sendMessage(packet)
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if err != nil {
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return nil, err
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}
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l.Debug.Printf("%d: returning", msgCtx.id)
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return msgCtx, nil
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}
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func (l *Conn) readPacket(msgCtx *messageContext) (*ber.Packet, error) {
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l.Debug.Printf("%d: waiting for response", msgCtx.id)
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packetResponse, ok := <-msgCtx.responses
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if !ok {
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return nil, NewError(ErrorNetwork, errRespChanClosed)
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}
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packet, err := packetResponse.ReadPacket()
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l.Debug.Printf("%d: got response %p", msgCtx.id, packet)
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if err != nil {
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return nil, err
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}
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if packet == nil {
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return nil, NewError(ErrorNetwork, errCouldNotRetMsg)
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}
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if l.Debug {
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if err = addLDAPDescriptions(packet); err != nil {
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return nil, err
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}
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l.Debug.PrintPacket(packet)
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}
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return packet, nil
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}
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func getReferral(err error, packet *ber.Packet) (referral string, e error) {
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if !IsErrorWithCode(err, LDAPResultReferral) {
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return "", nil
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}
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if len(packet.Children) < 2 {
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return "", fmt.Errorf("ldap: returned error indicates the packet contains a referral but it doesn't have sufficient child nodes: %w", err)
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}
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if packet.Children[1].Tag != ber.TagObjectDescriptor {
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return "", fmt.Errorf("ldap: returned error indicates the packet contains a referral but the relevant child node isn't an object descriptor: %w", err)
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}
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var ok bool
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for _, child := range packet.Children[1].Children {
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if child.Tag == ber.TagBitString && len(child.Children) >= 1 {
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if referral, ok = child.Children[0].Value.(string); ok {
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return referral, nil
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}
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}
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}
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return "", fmt.Errorf("ldap: returned error indicates the packet contains a referral but the referral couldn't be decoded: %w", err)
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}
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