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testcontrol: replace panic with error

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I have seen this once in the VM test (caused by an EOF, I believe on
shutdown) that didn't need to cause the test to fail.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
This commit is contained in:
David Crawshaw 2021-08-30 13:54:35 +00:00 committed by David Crawshaw
parent 5bacbf3744
commit 4e18cca62e
1 changed files with 24 additions and 14 deletions
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38
tstest/integration/testcontrol/testcontrol.go
View File

@ -36,6 +36,8 @@ import (
"tailscale.com/types/wgkey" "tailscale.com/types/wgkey"
) )
const msgLimit = 1 << 20 // encrypted message length limit
// Server is a control plane server. Its zero value is ready for use. // Server is a control plane server. Its zero value is ready for use.
// Everything is stored in-memory in one tailnet. // Everything is stored in-memory in one tailnet.
type Server struct { type Server struct {
@ -397,15 +399,23 @@ func (s *Server) CompleteAuth(authPathOrURL string) bool {
} }
func (s *Server) serveRegister(w http.ResponseWriter, r *http.Request, mkey tailcfg.MachineKey) { func (s *Server) serveRegister(w http.ResponseWriter, r *http.Request, mkey tailcfg.MachineKey) {
msg, err := ioutil.ReadAll(io.LimitReader(r.Body, msgLimit))
if err != nil {
r.Body.Close()
http.Error(w, fmt.Sprintf("bad map request read: %v", err), 400)
return
}
r.Body.Close()
var req tailcfg.RegisterRequest var req tailcfg.RegisterRequest
if err := s.decode(mkey, r.Body, &req); err != nil { if err := s.decode(mkey, msg, &req); err != nil {
panic(fmt.Sprintf("serveRegister: decode: %v", err)) go panic(fmt.Sprintf("serveRegister: decode: %v", err))
} }
if req.Version != 1 { if req.Version != 1 {
panic(fmt.Sprintf("serveRegister: unsupported version: %d", req.Version)) go panic(fmt.Sprintf("serveRegister: unsupported version: %d", req.Version))
} }
if req.NodeKey.IsZero() { if req.NodeKey.IsZero() {
panic("serveRegister: request has zero node key") go panic("serveRegister: request has zero node key")
} }
if s.Verbose { if s.Verbose {
j, _ := json.MarshalIndent(req, "", "\t") j, _ := json.MarshalIndent(req, "", "\t")
@ -558,8 +568,16 @@ func (s *Server) serveMap(w http.ResponseWriter, r *http.Request, mkey tailcfg.M
defer s.incrInServeMap(-1) defer s.incrInServeMap(-1)
ctx := r.Context() ctx := r.Context()
msg, err := ioutil.ReadAll(io.LimitReader(r.Body, msgLimit))
if err != nil {
r.Body.Close()
http.Error(w, fmt.Sprintf("bad map request read: %v", err), 400)
return
}
r.Body.Close()
req := new(tailcfg.MapRequest) req := new(tailcfg.MapRequest)
if err := s.decode(mkey, r.Body, req); err != nil { if err := s.decode(mkey, msg, req); err != nil {
go panic(fmt.Sprintf("bad map request: %v", err)) go panic(fmt.Sprintf("bad map request: %v", err))
} }
@ -747,15 +765,7 @@ func (s *Server) sendMapMsg(w http.ResponseWriter, mkey tailcfg.MachineKey, comp
return nil return nil
} }
func (s *Server) decode(mkey tailcfg.MachineKey, r io.Reader, v interface{}) error { func (s *Server) decode(mkey tailcfg.MachineKey, msg []byte, v interface{}) error {
if c, _ := r.(io.Closer); c != nil {
defer c.Close()
}
const msgLimit = 1 << 20
msg, err := ioutil.ReadAll(io.LimitReader(r, msgLimit))
if err != nil {
return err
}
if len(msg) == msgLimit { if len(msg) == msgLimit {
return errors.New("encrypted message too long") return errors.New("encrypted message too long")
} }