stephane-martin/skewer: services/network/udp.go; 62 LoC

Found a possible issue in [stephane-martin/skewer](https://www.github.com/stephane-martin/skewer) at [services/network/udp.go](https://github.com/stephane-martin/skewer/blob/2081a449f6b40c02ee2009caf9c165da9a3dd260/services/network/udp.go#L181-L242)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

> range-loop variable syslogConf used in defer or goroutine at line 202

[Click here to see the code in its original context.](https://github.com/stephane-martin/skewer/blob/2081a449f6b40c02ee2009caf9c165da9a3dd260/services/network/udp.go#L181-L242)

Click here to show the 62 line(s) of Go which triggered the analyzer.

```go
for _, syslogConf := range s.UdpConfigs {
if len(syslogConf.UnixSocketPath) > 0 {
conn, err := s.Binder.ListenPacket("unixgram", syslogConf.UnixSocketPath, 65536)
if err != nil {
s.Logger.Warn("Listen unixgram error", "error", err)
continue
}
s.Logger.Debug(
"Unixgram listener",
"protocol", "udp",
"path", syslogConf.UnixSocketPath,
"format", syslogConf.Format,
)
c <- model.ListenerInfo{
UnixSocketPath: syslogConf.UnixSocketPath,
Protocol: "udp",
}
s.UnixSocketPaths = append(s.UnixSocketPaths, syslogConf.UnixSocketPath)
wg.Add(1)
go func() {
defer wg.Done()
err := s.handleConnection(conn, syslogConf)
if err != nil && !eerrors.HasFileClosed(err) {
s.Logger.Warn("Unix datagram connection error", "error", err)
}
}()
} else {
listenAddrs, err := syslogConf.GetListenAddrs()
if err != nil {
s.Logger.Warn("Error getting listening address for UDP connection", "error", err)
continue
}
L:
for port, listenAddr := range listenAddrs {
conn, err := s.Binder.ListenPacket("udp", listenAddr, 65536)
if err != nil {
s.Logger.Warn("Listen UDP error", "error", err)
continue L
}
s.Logger.Debug(
"UDP listener",
"protocol", "udp",
"bind_addr", syslogConf.BindAddr,
"port", port,
"format", syslogConf.Format,
)
c <- model.ListenerInfo{
BindAddr: syslogConf.BindAddr,
Port: port,
Protocol: "udp",
}
wg.Add(1)
go func() {
defer wg.Done()
err := s.handleConnection(conn, syslogConf)
if err != nil && !eerrors.HasFileClosed(err) {
s.Logger.Warn("UDP connection error", "error", err)
}
}()
}
}
}

```

Leave a reaction on this issue to contribute to the project by classifying this instance as a **Bug** :-1:, **Mitigated** :+1:, or **Desirable Behavior** :rocket:
See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 2081a449f6b40c02ee2009caf9c165da9a3dd260