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adbb38f298
The PostgreSQL server will reject messages greater than ~1 GB anyway. However, worse than that is that a message that is larger than 4 GB could wrap the 32-bit integer message size and be interpreted by the server as multiple messages. This could allow a malicious client to inject arbitrary protocol messages. https://github.com/jackc/pgx/security/advisories/GHSA-mrww-27vc-gghv
72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
package pgproto3
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import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"github.com/jackc/pgx/v5/internal/pgio"
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)
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type NotificationResponse struct {
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PID uint32
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Channel string
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Payload string
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}
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// Backend identifies this message as sendable by the PostgreSQL backend.
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func (*NotificationResponse) Backend() {}
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// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
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// type identifier and 4 byte message length.
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func (dst *NotificationResponse) Decode(src []byte) error {
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buf := bytes.NewBuffer(src)
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if buf.Len() < 4 {
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return &invalidMessageFormatErr{messageType: "NotificationResponse", details: "too short"}
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}
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pid := binary.BigEndian.Uint32(buf.Next(4))
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b, err := buf.ReadBytes(0)
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if err != nil {
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return err
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}
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channel := string(b[:len(b)-1])
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b, err = buf.ReadBytes(0)
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if err != nil {
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return err
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}
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payload := string(b[:len(b)-1])
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*dst = NotificationResponse{PID: pid, Channel: channel, Payload: payload}
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return nil
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}
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// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
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func (src *NotificationResponse) Encode(dst []byte) ([]byte, error) {
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dst, sp := beginMessage(dst, 'A')
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dst = pgio.AppendUint32(dst, src.PID)
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dst = append(dst, src.Channel...)
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dst = append(dst, 0)
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dst = append(dst, src.Payload...)
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dst = append(dst, 0)
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return finishMessage(dst, sp)
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}
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// MarshalJSON implements encoding/json.Marshaler.
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func (src NotificationResponse) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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PID uint32
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Channel string
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Payload string
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}{
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Type: "NotificationResponse",
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PID: src.PID,
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Channel: src.Channel,
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Payload: src.Payload,
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})
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}
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