a large number of udp connections cause a deadloop of server
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- Dominant language
- Go
- Stars
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Description
func (u *udpListener) runOutbound(ctx context.Context) error {
p := udpPacket{}
if err := uc.decode(&p); err == io.EOF {
//outbound ssh disconnected, get new connection...
continue
} else if err != nil {
return u.Errorf("decode error: %w", err)
if the client closes the udp ssh channel(not the ssh connection) due to error"open too many files", the server will fall into a dead loop whitch reads EOF repeatedly from the same outbound ssh and have no chance to get a new connection.
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Research direction
Start in the udpListener.runOutbound function shown in the report and inspect how udpPacket decoding handles io.EOF on the outbound SSH channel. Reproduce or trace the client closing only the UDP SSH channel after an open-files error. Done means the server does not repeatedly read EOF from the same channel and can obtain a new connection.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- go
- Domain
- networking
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100