I'm trying to write simple port scanner and using "net" to check port
availability:
func sock() {
conn, err := net.Dial("tcp", "192.168.0.1:9991")
if err != nil {
fmt.Printf("\n!!!:: %v", err)
conn.Close()
Debug return error:
!!!:: dial tcp 192.168.0.1:9991: getsockopt: connection refusedpanic:
runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x20 pc=0x401186]
goroutine 1 [running]:
panic(0x564e00, 0xc82000a140)
/usr/lib/go-1.6/src/runtime/panic.go:481 +0x3e6
main.sock()
/home/m/go/ps.go:16 +0x186
main.main()
/home/m/go/ps.go:70 +0x620
exit status 2
It looks like "refused" calls runtime error and app crash in panic. How can
I work with errors to keep my app working?
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