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add custom network service names #174
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,217 @@ | ||
| /* | ||
| * Copyright (C) 2022 IBM, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * > Note: this code is a revised and enhanced version of the netdb.go file | ||
| * > from https://github.com/dominikh/go-netdb/ (MIT License) | ||
| */ | ||
|
|
||
| package netdb | ||
|
|
||
| import ( | ||
| "io/ioutil" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
|
||
| type Protoent struct { | ||
| Name string | ||
| Aliases []string | ||
| Number int | ||
| } | ||
|
|
||
| type Servent struct { | ||
| Name string | ||
| Aliases []string | ||
| Port int | ||
| Protocol *Protoent | ||
| } | ||
|
|
||
| // These variables get populated from /etc/protocols and /etc/services | ||
| // respectively. | ||
| var ( | ||
| Protocols []*Protoent | ||
| Services []*Servent | ||
| ) | ||
|
|
||
| func Init(protocolsFile, servicesFile string) error { | ||
| Protocols = []*Protoent{} | ||
| Services = []*Servent{} | ||
|
|
||
| protoMap := make(map[string]*Protoent) | ||
|
|
||
| // Load protocols | ||
| if protocolsFile == "" { | ||
| protocolsFile = "/etc/protocols" | ||
| } | ||
| data, err := ioutil.ReadFile(protocolsFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for _, line := range strings.Split(string(data), "\n") { | ||
| line = strings.TrimSpace(line) | ||
| split := strings.SplitN(line, "#", 2) | ||
| fields := strings.Fields(split[0]) | ||
| if len(fields) < 2 { | ||
| continue | ||
| } | ||
|
|
||
| num, err := strconv.ParseInt(fields[1], 10, 32) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| protoent := &Protoent{ | ||
| Name: fields[0], | ||
| Aliases: fields[2:], | ||
| Number: int(num), | ||
| } | ||
| Protocols = append(Protocols, protoent) | ||
|
|
||
| protoMap[fields[0]] = protoent | ||
| } | ||
|
|
||
| // Load services | ||
| if servicesFile == "" { | ||
| servicesFile = "/etc/services" | ||
| } | ||
| data, err = ioutil.ReadFile(servicesFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for _, line := range strings.Split(string(data), "\n") { | ||
| line = strings.TrimSpace(line) | ||
| split := strings.SplitN(line, "#", 2) | ||
| fields := strings.Fields(split[0]) | ||
| if len(fields) < 2 { | ||
| continue | ||
| } | ||
|
|
||
| name := fields[0] | ||
| portproto := strings.SplitN(fields[1], "/", 2) | ||
| port, err := strconv.ParseInt(portproto[0], 10, 32) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| proto := portproto[1] | ||
| aliases := fields[2:] | ||
|
|
||
| Services = append(Services, &Servent{ | ||
| Name: name, | ||
| Aliases: aliases, | ||
| Port: int(port), | ||
| Protocol: protoMap[proto], | ||
| }) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Equal checks if two Protoents are the same, which is the case if | ||
| // their protocol numbers are identical or when both Protoents are | ||
| // nil. | ||
| func (this *Protoent) Equal(other *Protoent) bool { | ||
| if this == nil && other == nil { | ||
| return true | ||
| } | ||
|
|
||
| if this == nil || other == nil { | ||
| return false | ||
| } | ||
|
|
||
| return this.Number == other.Number | ||
| } | ||
|
|
||
| // Equal checks if two Servents are the same, which is the case if | ||
| // their port numbers and protocols are identical or when both | ||
| // Servents are nil. | ||
| func (this *Servent) Equal(other *Servent) bool { | ||
| if this == nil && other == nil { | ||
| return true | ||
| } | ||
|
|
||
| if this == nil || other == nil { | ||
| return false | ||
| } | ||
|
|
||
| return this.Port == other.Port && | ||
| this.Protocol.Equal(other.Protocol) | ||
| } | ||
|
|
||
| // GetProtoByNumber returns the Protoent for a given protocol number. | ||
| func GetProtoByNumber(num int) (protoent *Protoent) { | ||
| for _, protoent := range Protocols { | ||
| if protoent.Number == num { | ||
| return protoent | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // GetProtoByName returns the Protoent whose name or any of its | ||
| // aliases matches the argument. | ||
| func GetProtoByName(name string) (protoent *Protoent) { | ||
| for _, protoent := range Protocols { | ||
| if protoent.Name == name { | ||
| return protoent | ||
| } | ||
|
|
||
| for _, alias := range protoent.Aliases { | ||
| if alias == name { | ||
| return protoent | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // GetServByName returns the Servent for a given service name or alias | ||
| // and protocol. If the protocol is nil, the first service matching | ||
| // the service name is returned. | ||
| func GetServByName(name string, protocol *Protoent) (servent *Servent) { | ||
| for _, servent := range Services { | ||
| if !servent.Protocol.Equal(protocol) { | ||
| continue | ||
| } | ||
|
|
||
| if servent.Name == name { | ||
| return servent | ||
| } | ||
|
|
||
| for _, alias := range servent.Aliases { | ||
| if alias == name { | ||
| return servent | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // GetServByPort returns the Servent for a given port number and | ||
| // protocol. If the protocol is nil, the first service matching the | ||
| // port number is returned. | ||
| func GetServByPort(port int, protocol *Protoent) *Servent { | ||
| for _, servent := range Services { | ||
| if servent.Port == port && servent.Protocol.Equal(protocol) { | ||
| return servent | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
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