Golang SNMP Development Learning Note (i)

This is a creation in Article, where the information may have evolved or changed.

Overview

SONIAH/GOSNMP is a pure Go language-written SNMP package, based on ALOUCA/GOSNMP development. Currently provides getrequest, GetNext, Getbulk, walk, and setrequest functions, supports IPV4 and IPV6, and supports SNMPV2C and SNMPv3. GOSNMP is still in development, currently does not support Trap,walk and setrequest is not perfect, but as a general network monitoring use is sufficient, if necessary can also be directly modified to supplement the source code.
This article describes the Getrequest, GetNext, and getbulk operations of SONIAH/GOSNMP.

Resources

• Document: HTTPS://GODOC.ORG/GITHUB.COM/SONIAH/GOSNMP
• Source: Https://github.com/soniah/gosnmp

Installation

get github.com/soniah/gosnmp

Example 1. Getrequest

 PackageMainImport("FMT"    "Log"G"Github.com/soniah/gosnmp")funcMain () {//Default is a pointer-a GOSNMP struct that contains    //sensible defaults eg Port 161, community public, etcG.default.target ="172.18.0.2"G.default.community ="Community"ERR: = G.default.connect ()ifErr! =Nil{log. Fatalf ("Connect () Err:%v", err)}deferG.default.conn.close () OIDs: = []string{"1.3.6.1.2.1.1.5.0","1.3.6.1.2.1.1.7.0"} result, err: = G.default.get (OIDs)//Get () accepts up to G.max_oids    ifErr! =Nil{log. Fatalf ("Get () Err:%v", err)} forI, V: =RangeResult. Variables {fmt. Printf ("%d. OID:%s", I, V.name)//The Value of each variable returned by Get () implements        //interface{}. You could do a type switch ...        Switchv.type{ CaseG.octetstring:fmt. Printf ("string:%s\n",string(V.value. ([]byte)))default://... or often you ' re just interested in numeric values.            //Tobigint () would return the Value as a BigInt, for plugging            //into your calculations.Fmt. Printf ("Number:%d\n", G.tobigint (V.value))}}}

Output Result:

0. oid: .1.3.6.1.2.1.1.5.0 string: YD_WLZX1F_S26521. oid: .1.3.6.1.2.1.1.7.0 number: 3

Example 2. Construct GOSNMP structure by oneself

 PackageMainImport("FMT"    "Log"    "Time"G"Github.com/soniah/gosnmp")funcMain () {//Build our own gosnmp struct, rather than using G.defaultSNMP: = &g.gosnmp{Target:"172.18.0.2", Port:161, Community:"Community", VERSION:G.VERSION2C, Timeout:time. Duration(2) * time. Second,} ERR: = SNMP. Connect ()ifErr! =Nil{log. Fatalf ("Connect () Err:%v", err)}deferSnmp. Conn.close () OIDs: = []string{"1.3.6.1.2.1.1.5.0","1.3.6.1.2.1.1.7.0"} result, err: = SNMP. Get (OIDs)ifErr! =Nil{log. Fatalf ("Get () Err:%v", err)} forI, V: =RangeResult. Variables {fmt. Printf ("%d. OID:%s", I, V.name)Switchv.type{ CaseG.octetstring:fmt. Printf ("string:%s\n",string(V.value. ([]byte)))default: FMT. Printf ("Number:%d\n", G.tobigint (V.value))}}}

Output Result:

0. oid: .1.3.6.1.2.1.1.5.0 string: YD_WLZX1F_S26521. oid: .1.3.6.1.2.1.1.7.0 number: 3

Example 3. SNMPv3

 PackageMainImport("FMT"    "Log"    "Time"G"Github.com/soniah/gosnmp")funcMain () {snmp: = &gosnmp{Target:"172.17.0.10", Port:161, Community:"Community", Version:g.version3, Timeout:time. Duration( in) * time. Second, Securitymodel:g.usersecuritymodel, Msgflags:g.authpriv,//authentication and encryptionSecurityparameters: &g.usmsecurityparameters {UserName:"User", Authenticationprotocol:g.sha, Authenticationpassphrase:"Password", Privacyprotocol:g.des, Privacypassphrase:"Password",},} err: = SNMP. Connect ()ifErr! =Nil{log. Fatalf ("Connect () Err:%v", err)}deferSnmp. Conn.close () OIDs: = []string{"1.3.6.1.2.1.1.5.0","1.3.6.1.2.1.1.7.0"} result, err: = SNMP. Get (OIDs)ifErr! =Nil{log. Fatalf ("Get () Err:%v", err)} forI, V: =RangeResult. Variables {fmt. Printf ("%d. OID:%s", I, V.name)Switchv.type{ CaseG.octetstring:fmt. Printf ("string:%s\n",string(V.value. ([]byte)))default: FMT. Printf ("Number:%d\n", G.tobigint (V.value))}}}

TODO: Sample 3 code is not validated.

Example 4. GetNext

 PackageMainImport("FMT"    "Log"G"Github.com/soniah/gosnmp")funcMain () {g.default.target ="172.18.0.2"G.default.community ="Community"ERR: = G.default.connect ()ifErr! =Nil{log. Fatalf ("Connect () Err:%v", err)}deferG.default.conn.close () OIDs: = []string{"1.3.6.1.2.1.1.5","1.3.6.1.2.1.2.2.1.10"} result, err: = G.default.getnext (OIDs)ifErr! =Nil{log. Fatalf ("Get () Err:%v", err)} forI, V: =RangeResult. Variables {fmt. Printf ("%d. OID:%s", I, V.name)Switchv.type{ CaseG.octetstring:fmt. Printf ("string:%s\n",string(V.value. ([]byte)))default: FMT. Printf ("Number:%d\n", G.tobigint (V.value))}}}

Output Result:

0. oid: .1.3.6.1.2.1.1.5.0 string: YD_WLZX1F_S26521. oid: .1.3.6.1.2.1.2.2.1.10.1 number: 144611

Example 5. Getbulk

 PackageMainImport("FMT"    "Log"G"Github.com/soniah/gosnmp")funcMain () {g.default.target ="172.18.0.2"G.default.community ="Community"ERR: = G.default.connect ()ifErr! =Nil{log. Fatalf ("Connect () Err:%v", err)}deferG.default.conn.close () OIDs: = []string{"1.3.6.1.2.1.1.2",//sysobjectid        "1.3.6.1.2.1.1.5",//sysname        "1.3.6.1.2.1.2.2.1.1",//ifindex        "1.3.6.1.2.1.2.2.1.10",//ifinoctets        "1.3.6.1.2.1.2.2.1.16",//ifoutoctets}//The first 2 OIDs do not repeat, after 3 repeats 10 times, equivalent to perform 5 times GetNextresult, err: = G.default.getbulk (OIDs,2,5)ifErr! =Nil{log. Fatalf ("Get () Err:%v", err)} forI, V: =RangeResult. Variables {fmt. Printf ("%d:%s =", I, V.name)Switchv.type{ CaseG.octetstring:fmt. Printf ("%s\n",string(V.value. ([]byte)))default: FMT. Printf ("%d\n", G.tobigint (V.value))}}}

Output Result:

0:. 1.3.6.1.2.1.1.2.0 = 01:. 1.3.6.1.2.1.1.5.0 = yd_wlzx1f_s26522:. 1.3.6.1.2.1.2.2.1.1.1 = 13:. 1.3.6.1.2.1.2.2.1.10.1 = 1446114:. 1.3.6.1.2.1.2.2.1.16.1 = 5393062845:. 1.3.6.1.2.1.2.2.1.1.2 = 26:. 1.3.6.1.2.1.2.2.1.10.2 = 07:. 1.3.6.1.2.1.2.2.1.16.2 = 08:. 1.3.6.1.2.1.2.2.1.1.3 = 39:. 1.3.6.1.2.1.2.2.1.10.3 = 70688630Ten:. 1.3.6.1.2.1.2.2.1.16.3 = 216291621 One:. 1.3.6.1.2.1.2.2.1.1.4 = 4 A:. 1.3.6.1.2.1.2.2.1.10.4 = 129777391 -:. 1.3.6.1.2.1.2.2.1.16.4 = 1052726443 -:. 1.3.6.1.2.1.2.2.1.1.5 = 5 the:. 1.3.6.1.2.1.2.2.1.10.5 = 169733222 -:. 1.3.6.1.2.1.2.2.1.16.5 = 641244267