You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
174 lines
4.3 KiB
174 lines
4.3 KiB
package p2p
|
|
|
|
import (
|
|
"net"
|
|
"sync"
|
|
"time"
|
|
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
)
|
|
|
|
const (
|
|
// FuzzModeDrop is a mode in which we randomly drop reads/writes, connections or sleep
|
|
FuzzModeDrop = iota
|
|
// FuzzModeDelay is a mode in which we randomly sleep
|
|
FuzzModeDelay
|
|
)
|
|
|
|
// FuzzedConnection wraps any net.Conn and depending on the mode either delays
|
|
// reads/writes or randomly drops reads/writes/connections.
|
|
type FuzzedConnection struct {
|
|
conn net.Conn
|
|
|
|
mtx sync.Mutex
|
|
start <-chan time.Time
|
|
active bool
|
|
|
|
config *FuzzConnConfig
|
|
}
|
|
|
|
// FuzzConnConfig is a FuzzedConnection configuration.
|
|
type FuzzConnConfig struct {
|
|
Mode int
|
|
MaxDelay time.Duration
|
|
ProbDropRW float64
|
|
ProbDropConn float64
|
|
ProbSleep float64
|
|
}
|
|
|
|
// DefaultFuzzConnConfig returns the default config.
|
|
func DefaultFuzzConnConfig() *FuzzConnConfig {
|
|
return &FuzzConnConfig{
|
|
Mode: FuzzModeDrop,
|
|
MaxDelay: 3 * time.Second,
|
|
ProbDropRW: 0.2,
|
|
ProbDropConn: 0.00,
|
|
ProbSleep: 0.00,
|
|
}
|
|
}
|
|
|
|
// FuzzConn creates a new FuzzedConnection. Fuzzing starts immediately.
|
|
func FuzzConn(conn net.Conn) net.Conn {
|
|
return FuzzConnFromConfig(conn, DefaultFuzzConnConfig())
|
|
}
|
|
|
|
// FuzzConnFromConfig creates a new FuzzedConnection from a config. Fuzzing
|
|
// starts immediately.
|
|
func FuzzConnFromConfig(conn net.Conn, config *FuzzConnConfig) net.Conn {
|
|
return &FuzzedConnection{
|
|
conn: conn,
|
|
start: make(<-chan time.Time),
|
|
active: true,
|
|
config: config,
|
|
}
|
|
}
|
|
|
|
// FuzzConnAfter creates a new FuzzedConnection. Fuzzing starts when the
|
|
// duration elapses.
|
|
func FuzzConnAfter(conn net.Conn, d time.Duration) net.Conn {
|
|
return FuzzConnAfterFromConfig(conn, d, DefaultFuzzConnConfig())
|
|
}
|
|
|
|
// FuzzConnAfterFromConfig creates a new FuzzedConnection from a config.
|
|
// Fuzzing starts when the duration elapses.
|
|
func FuzzConnAfterFromConfig(conn net.Conn, d time.Duration, config *FuzzConnConfig) net.Conn {
|
|
return &FuzzedConnection{
|
|
conn: conn,
|
|
start: time.After(d),
|
|
active: false,
|
|
config: config,
|
|
}
|
|
}
|
|
|
|
// Config returns the connection's config.
|
|
func (fc *FuzzedConnection) Config() *FuzzConnConfig {
|
|
return fc.config
|
|
}
|
|
|
|
// Read implements net.Conn.
|
|
func (fc *FuzzedConnection) Read(data []byte) (n int, err error) {
|
|
if fc.fuzz() {
|
|
return 0, nil
|
|
}
|
|
return fc.conn.Read(data)
|
|
}
|
|
|
|
// Write implements net.Conn.
|
|
func (fc *FuzzedConnection) Write(data []byte) (n int, err error) {
|
|
if fc.fuzz() {
|
|
return 0, nil
|
|
}
|
|
return fc.conn.Write(data)
|
|
}
|
|
|
|
// Close implements net.Conn.
|
|
func (fc *FuzzedConnection) Close() error { return fc.conn.Close() }
|
|
|
|
// LocalAddr implements net.Conn.
|
|
func (fc *FuzzedConnection) LocalAddr() net.Addr { return fc.conn.LocalAddr() }
|
|
|
|
// RemoteAddr implements net.Conn.
|
|
func (fc *FuzzedConnection) RemoteAddr() net.Addr { return fc.conn.RemoteAddr() }
|
|
|
|
// SetDeadline implements net.Conn.
|
|
func (fc *FuzzedConnection) SetDeadline(t time.Time) error { return fc.conn.SetDeadline(t) }
|
|
|
|
// SetReadDeadline implements net.Conn.
|
|
func (fc *FuzzedConnection) SetReadDeadline(t time.Time) error {
|
|
return fc.conn.SetReadDeadline(t)
|
|
}
|
|
|
|
// SetWriteDeadline implements net.Conn.
|
|
func (fc *FuzzedConnection) SetWriteDeadline(t time.Time) error {
|
|
return fc.conn.SetWriteDeadline(t)
|
|
}
|
|
|
|
func (fc *FuzzedConnection) randomDuration() time.Duration {
|
|
maxDelayMillis := int(fc.config.MaxDelay.Nanoseconds() / 1000)
|
|
return time.Millisecond * time.Duration(cmn.RandInt()%maxDelayMillis) // nolint: gas
|
|
}
|
|
|
|
// implements the fuzz (delay, kill conn)
|
|
// and returns whether or not the read/write should be ignored
|
|
func (fc *FuzzedConnection) fuzz() bool {
|
|
if !fc.shouldFuzz() {
|
|
return false
|
|
}
|
|
|
|
switch fc.config.Mode {
|
|
case FuzzModeDrop:
|
|
// randomly drop the r/w, drop the conn, or sleep
|
|
r := cmn.RandFloat64()
|
|
if r <= fc.config.ProbDropRW {
|
|
return true
|
|
} else if r < fc.config.ProbDropRW+fc.config.ProbDropConn {
|
|
// XXX: can't this fail because machine precision?
|
|
// XXX: do we need an error?
|
|
fc.Close() // nolint: errcheck, gas
|
|
return true
|
|
} else if r < fc.config.ProbDropRW+fc.config.ProbDropConn+fc.config.ProbSleep {
|
|
time.Sleep(fc.randomDuration())
|
|
}
|
|
case FuzzModeDelay:
|
|
// sleep a bit
|
|
time.Sleep(fc.randomDuration())
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (fc *FuzzedConnection) shouldFuzz() bool {
|
|
if fc.active {
|
|
return true
|
|
}
|
|
|
|
fc.mtx.Lock()
|
|
defer fc.mtx.Unlock()
|
|
|
|
select {
|
|
case <-fc.start:
|
|
fc.active = true
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|