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cli_linux.go
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cli_linux.go
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// +build linux
// +build amd64 386
package cli
import (
"flag"
"fmt"
"os"
)
// COMMAND LINE INTERFACE
func init() {
// 不加-h选项也可以正确显示帮助信息
// flag.BoolVar(&help, "h", false, "help")
flag.IntVar(&Args.LocalPort, "lport", 0, "Listen a local `port`.")
flag.StringVar(&Args.LocalIP, "lhost", "", "Local `ip` address.")
flag.IntVar(&Args.RemotePort, "rport", 0, "The `port` on remote host.")
flag.StringVar(&Args.RemoteIP, "rhost", "", "Remote `ip` address.")
flag.IntVar(&Args.ReusedPort, "reuse-port", 0, "The `port` to be reused.")
flag.StringVar(&Args.Password, "passwd", "", "The `password` used in encrypted communication. (optional)")
// 改变默认的 Usage
flag.Usage = usage
}
func usage() {
fmt.Fprintf(os.Stderr, `Venom version: 1.1
Usage:
$ ./venom_agent -lport [port]
$ ./venom_agent -rhost [ip] -rport [port]
$ ./venom_agent -lhost [ip] -reuse-port [port]
$ ./venom_agent -lport [port] -reuse-port [port]
Options:
`)
flag.PrintDefaults()
}
// ParseArgs is a function aim to parse the command line args
func ParseArgs() {
flag.Parse()
if Args.RemoteIP != "" && Args.RemotePort != 0 && Args.LocalPort == 0 &&
Args.LocalIP == "" && Args.ReusedPort == 0 {
// connect to remote port
Args.Mode = CONNECT_MODE
} else if Args.LocalPort != 0 && Args.RemoteIP == "" && Args.RemotePort == 0 &&
Args.LocalIP == "" && Args.ReusedPort == 0 {
// listen a local port
Args.Mode = LISTEN_MODE
} else if Args.LocalIP != "" && Args.ReusedPort != 0 && Args.LocalPort == 0 &&
Args.RemoteIP == "" && Args.RemotePort == 0 {
Args.Mode = LISTEN_MODE
Args.PortReuseMethod = SOCKET_REUSE_METHOD
} else if Args.LocalPort != 0 && Args.ReusedPort != 0 && Args.LocalIP == "" &&
Args.RemoteIP == "" && Args.RemotePort == 0 {
Args.Mode = LISTEN_MODE
Args.PortReuseMethod = IPTABLES_METHOD
} else {
// error
flag.Usage()
os.Exit(0)
}
}