git clone https://github.com/yanweijin/crack
go build main.go
➜ crack git:(master) ✗ go run main.go --help
-P string
filename list or username
-U string
filename list or username
-i string
ip addr 192.168.1.1/24，192.168.1-255，192.168.1.1
-p string
port 21,22，445，3306，1433
-s string
service ftp ssh，smb，mssql，mysql, postgresql default only scan tcp port (default "scan")
-t int
thread (default 100)
go run main.go -i 192.168.1.1/15 -U root -P 123456 -s mysql