Playing around with Go and SNMP

hello.go

package main

import "fmt"
import "os"
import "regexp"
import "strconv"
import gosnmp "github.com/alouca/gosnmp"

func interfacecheck(ip string) {
  fmt.Println("Checking " + ip)
  //Create a new snmp client
  snmp, _ := gosnmp.NewGoSNMP(ip, "EcofisVC", gosnmp.Version2c, 5)
  //Lets get the hostname first
  //172.30.40.73
  resp, err := snmp.Get(".1.3.6.1.2.1.1.5.0")
  if err == nil {
    for _, v := range resp.Variables {
      fmt.Println( v.Type)
      fmt.Println(string(v.Value))
    }
  }
} 

func main() {
    // First, declare which IP may be valid
    var validIP = regexp.MustCompile(`^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$`)
    // Get the IP from the command line
    ip := os.Args[1]
    //If the IP matches the regexp
    if validIP.MatchString(ip){
      //Check each octet
      matches := validIP.FindStringSubmatch(ip)
      for i:=1; i<len(matches); i++{
        if octet, _ := strconv.Atoi(matches[i]); octet<0 || octet>255{
          //If the octet is too big, exit
          fmt.Println(ip + " is not a valid IP")
          os.Exit(2)
        }
      }
      // Else do the check
      interfacecheck(ip)
    // If the IP does not match the regexp
    } else {
      fmt.Println(ip + " is not a valid IP")
      os.Exit(2)
    }
}