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translate.go
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package snmp
import (
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"github.com/influxdata/telegraf"
"github.com/sleepinggenius2/gosmi"
"github.com/sleepinggenius2/gosmi/types"
)
// must init, append path for each directory, load module for every file
// or gosmi will fail without saying why
var m sync.Mutex
var once sync.Once
var cache = make(map[string]bool)
func appendPath(path string) {
m.Lock()
defer m.Unlock()
gosmi.AppendPath(path)
}
func loadModule(path string) error {
m.Lock()
defer m.Unlock()
_, err := gosmi.LoadModule(path)
return err
}
func ClearCache() {
cache = make(map[string]bool)
}
func LoadMibsFromPath(paths []string, log telegraf.Logger) error {
once.Do(gosmi.Init)
for _, mibPath := range paths {
folders := []string{}
// Check if we loaded that path already and skip it if so
m.Lock()
cached := cache[mibPath]
cache[mibPath] = true
m.Unlock()
if cached {
continue
}
appendPath(mibPath)
folders = append(folders, mibPath)
err := filepath.Walk(mibPath, func(path string, info os.FileInfo, err error) error {
// symlinks are files so we need to double check if any of them are folders
// Will check file vs directory later on
if info.Mode()&os.ModeSymlink != 0 {
link, err := os.Readlink(path)
if err != nil {
log.Warnf("Bad symbolic link %v", link)
}
folders = append(folders, link)
}
return nil
})
if err != nil {
return fmt.Errorf("Filepath could not be walked: %v", err)
}
for _, folder := range folders {
err := filepath.Walk(folder, func(path string, info os.FileInfo, err error) error {
// checks if file or directory
if info.IsDir() {
appendPath(path)
} else if info.Mode()&os.ModeSymlink == 0 {
if err := loadModule(info.Name()); err != nil {
log.Warn(err)
}
}
return nil
})
if err != nil {
return fmt.Errorf("Filepath could not be walked: %v", err)
}
}
}
return nil
}
// The following is for snmp_trap
type MibEntry struct {
MibName string
OidText string
}
func TrapLookup(oid string) (e MibEntry, err error) {
var node gosmi.SmiNode
node, err = gosmi.GetNodeByOID(types.OidMustFromString(oid))
// ensure modules are loaded or node will be empty (might not error)
if err != nil {
return e, err
}
e.OidText = node.RenderQualified()
i := strings.Index(e.OidText, "::")
if i == -1 {
return e, fmt.Errorf("not found")
}
e.MibName = e.OidText[:i]
e.OidText = e.OidText[i+2:]
return e, nil
}
// The following is for snmp
func GetIndex(oidNum string, mibPrefix string) (col []string, tagOids map[string]struct{}, err error) {
// first attempt to get the table's tags
tagOids = map[string]struct{}{}
// mimcks grabbing INDEX {} that is returned from snmptranslate -Td MibName
node, err := gosmi.GetNodeByOID(types.OidMustFromString(oidNum))
if err != nil {
return []string{}, map[string]struct{}{}, fmt.Errorf("getting submask: %w", err)
}
for _, index := range node.GetIndex() {
//nolint:staticcheck //assaignment to nil map to keep backwards compatibilty
tagOids[mibPrefix+index.Name] = struct{}{}
}
// grabs all columns from the table
// mimmicks grabbing everything returned from snmptable -Ch -Cl -c public 127.0.0.1 oidFullName
col = node.GetRow().AsTable().ColumnOrder
return col, tagOids, nil
}
//nolint:revive //Too many return variable but necessary
func SnmpTranslateCall(oid string) (mibName string, oidNum string, oidText string, conversion string, err error) {
var out gosmi.SmiNode
var end string
if strings.ContainsAny(oid, "::") {
// split given oid
// for example RFC1213-MIB::sysUpTime.0
s := strings.Split(oid, "::")
// node becomes sysUpTime.0
node := s[1]
if strings.ContainsAny(node, ".") {
s = strings.Split(node, ".")
// node becomes sysUpTime
node = s[0]
end = "." + s[1]
}
out, err = gosmi.GetNode(node)
if err != nil {
return oid, oid, oid, oid, err
}
oidNum = "." + out.RenderNumeric() + end
} else if strings.ContainsAny(oid, "abcdefghijklnmopqrstuvwxyz") {
//handle mixed oid ex. .iso.2.3
s := strings.Split(oid, ".")
for i := range s {
if strings.ContainsAny(s[i], "abcdefghijklmnopqrstuvwxyz") {
out, err = gosmi.GetNode(s[i])
if err != nil {
return oid, oid, oid, oid, err
}
s[i] = out.RenderNumeric()
}
}
oidNum = strings.Join(s, ".")
out, _ = gosmi.GetNodeByOID(types.OidMustFromString(oidNum))
} else {
out, err = gosmi.GetNodeByOID(types.OidMustFromString(oid))
oidNum = oid
// ensure modules are loaded or node will be empty (might not error)
// do not return the err as the oid is numeric and telegraf can continue
//nolint:nilerr
if err != nil || out.Name == "iso" {
return oid, oid, oid, oid, nil
}
}
tc := out.GetSubtree()
for i := range tc {
// case where the mib doesn't have a conversion so Type struct will be nil
// prevents seg fault
if tc[i].Type == nil {
break
}
switch tc[i].Type.Name {
case "MacAddress", "PhysAddress":
conversion = "hwaddr"
case "InetAddressIPv4", "InetAddressIPv6", "InetAddress", "IPSIpAddress":
conversion = "ipaddr"
}
}
oidText = out.RenderQualified()
i := strings.Index(oidText, "::")
if i == -1 {
return "", oid, oid, oid, fmt.Errorf("not found")
}
mibName = oidText[:i]
oidText = oidText[i+2:] + end
return mibName, oidNum, oidText, conversion, nil
}