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parse.go
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parse.go
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package inputparse
import (
"errors"
"fmt"
"net/netip"
"strconv"
"strings"
"github.com/go-playground/validator"
)
//TODO add file parser
//Parse host from string. Input could be single host (10.0.0.0), CIDR Notation (172.16.0.0/16), or comma seperated (192.168.1.1,192.168.1.3,192.168.1.5)
func ParseHost(host string) ([]string, error) {
v := validator.New()
var p []string
//Single Host
err := v.Var(host, "ip")
if err == nil {
p = append(p, host)
return p, nil
}
//Cidr
err = v.Var(host, "cidr")
if err == nil {
p, err = cidr(host)
if err != nil {
return p, err
}
return p, nil
}
//TODO, logging
//Comma seperated
if strings.Contains(host, ",") {
potentialTarget := strings.Split(host, ",")
for ahost := range potentialTarget {
potentialTarget[ahost] = strings.TrimSpace(potentialTarget[ahost])
err = v.Var(potentialTarget[ahost], "ip4_addr")
if err != nil {
continue
}
p = append(p, potentialTarget[ahost])
}
return p, err
}
return p, errors.New("could not inputparse IP address")
}
func ParsePorts(ports string) ([]int, error) {
var validports []int
//v := validator.New()
//Single Port
IntVar, err := strconv.Atoi(ports)
if err == nil {
validports = append(validports, IntVar)
return validports, nil
}
// Port range 1-500
if strings.Contains(ports, "-") {
rangePorts := strings.Split(ports, "-")
if len(rangePorts) != 2 {
return validports, errors.New("could not inputparse range between two numbers.")
}
minPort, err := strconv.Atoi(rangePorts[0])
if err != nil {
return validports, errors.New("could not inputparse int from port range")
}
maxPort, err := strconv.Atoi(rangePorts[1])
if err != nil {
return validports, errors.New("could not inputparse int from port range")
}
if minPort > maxPort {
return validports, errors.New("error validating port range. first number should be smaller. ex. 1-100")
}
for i := minPort; i < maxPort+1; i++ {
validports = append(validports, i)
}
if len(validports) == 0 {
return validports, errors.New("port range is empty somehow")
}
return validports, nil
}
//Comma Seperated
if strings.Contains(ports, ",") {
portsComma := strings.Split(ports, ",")
for x := range portsComma {
portsComma[x] = strings.TrimSpace(portsComma[x])
p, err := strconv.Atoi(portsComma[x])
if err != nil {
continue
}
validports = append(validports, p)
}
if len(validports) == 0 {
return validports, errors.New("port range is empty somehow")
}
return validports, nil
}
return nil, errors.New(fmt.Sprintf("could not inputparse ports from argument for %s", ports))
}
//Return List of IPs from CIDR Notation
func cidr(cidr string) ([]string, error) {
prefix, err := netip.ParsePrefix(cidr)
if err != nil {
return nil, err
}
var ips []netip.Addr
for addr := prefix.Addr(); prefix.Contains(addr); addr = addr.Next() {
ips = append(ips, addr)
}
var ipstring []string
for ipClass := range ips {
ipstring = append(ipstring, ips[ipClass].String())
}
return ipstring, nil
}