/
snmp.go
140 lines (117 loc) · 2.26 KB
/
snmp.go
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package dmc
import (
"fmt"
"os"
"strconv"
"strings"
"github.com/soniah/gosnmp"
)
func def(v, d string) string {
switch v {
case "":
return d
default:
return v
}
}
func env(v, e, d string) string {
return def(v, def(os.Getenv(e), d))
}
func index(oid string) int {
f := strings.Split(oid, ".")
if !(len(f) > 0) {
return 0
}
if n, err := strconv.Atoi(f[len(f)-1]); err == nil {
return n
}
return 0
}
func sysObjectID(snmp *gosnmp.GoSNMP) (*string, error) {
r, err := snmp.Get([]string{
".1.3.6.1.2.1.1.2.0",
})
if r == nil || err != nil {
return nil, err
}
var oid *string
for _, v := range r.Variables {
switch v.Type {
case gosnmp.ObjectIdentifier:
switch v.Name {
case ".1.3.6.1.2.1.1.2.0":
if a := v.Value.(string); a != "" {
oid = &a
}
}
}
}
return oid, nil
}
type sysInterface struct {
Name string
Type int
RX *uint32
TX *uint32
}
func sysInterfaces(snmp *gosnmp.GoSNMP) (map[int]sysInterface, error) {
w, err := snmp.WalkAll(".1.3.6.1.2.1.2.2.1")
if err != nil {
return nil, err
}
ids := make(map[int]sysInterface)
for _, v := range w {
switch v.Type {
case gosnmp.OctetString:
switch {
case strings.HasPrefix(v.Name, ".1.3.6.1.2.1.2.2.1.2"):
ids[index(v.Name)] = sysInterface{Name: string(v.Value.([]byte))}
}
}
}
for _, v := range w {
i, ok := ids[index(v.Name)]
if !ok {
continue
}
switch v.Type {
case gosnmp.Integer:
switch {
case strings.HasPrefix(v.Name, ".1.3.6.1.2.1.2.2.1.3"):
i.Type = v.Value.(int)
}
case gosnmp.Counter32:
switch {
case strings.HasPrefix(v.Name, ".1.3.6.1.2.1.2.2.1.10"):
if n := (uint32)(v.Value.(uint)); true {
i.RX = &n
}
case strings.HasPrefix(v.Name, ".1.3.6.1.2.1.2.2.1.16"):
if n := (uint32)(v.Value.(uint)); true {
i.TX = &n
}
}
}
ids[index(v.Name)] = i
}
return ids, nil
}
func interfaces(snmp *gosnmp.GoSNMP, iftype int) ([]interface{}, error) {
ids, err := sysInterfaces(snmp)
if err != nil {
return nil, err
}
var inf = make([]interface{}, 0)
for _, k := range ids {
if k.Type != iftype {
continue
}
t := make(map[string]interface{})
t["name"] = k.Name
t["rx"] = k.RX
t["tx"] = k.TX
inf = append(inf, t)
}
fmt.Println("->", inf)
return inf, nil
}