双击

安装snmputil和MIB Browser

getSwitchStatus.cpp：

#include <iostream>
#include <stdio.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>

using namespace std;

int main() {
    init_snmp("getSwitchStatus");

    netsnmp_session session;
    netsnmp_pdu* pdu;
    netsnmp_pdu* response;
    oid ifOperStatus_oid[] = { 1, 3, 6, 1, 2, 1, 2, 2, 1, 8 };  // OID for ifOperStatus (.1.3.6.1.2.1.2.2.1.8)
    size_t ifOperStatus_oid_len = sizeof(ifOperStatus_oid) / sizeof(oid);

    // Set up the SNMP session
    snmp_sess_init(&session);
    session.peername = strdup("192.168.37.1");  // Replace with the IP address or hostname of your switch
    session.version = SNMP_VERSION_2c;    
    const char* str="COMMUNITY_STRING";           // Use SNMP v2c (you can also use v1 or v3)
    session.community =const_cast<u_char*>(reinterpret_cast<const u_char*>(str));  // Replace with your community string
    session.community_len = strlen(reinterpret_cast<const char*>(session.community));

    // Open the SNMP session
    if (!snmp_open(&session) ) {
        fprintf(stderr, "Failed to open SNMP session.\n");
        exit(1);
    }
    // Create the PDU
    pdu = snmp_pdu_create(SNMP_MSG_GET);
    snmp_add_null_var(pdu, ifOperStatus_oid, ifOperStatus_oid_len);

    // Send the SNMP request
    int status = snmp_synch_response(&session, pdu, &response);
    if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
        // Process the response
        for (netsnmp_variable_list* vars = response->variables; vars; vars = vars->next_variable) {
            if (vars->type == ASN_INTEGER) {
                int value = *vars->val.integer;
                cout << "Interface Status: ";
                if (value == 1) {
                    cout << "Up" << endl;
                }
                else if (value == 2) {
                    cout << "Down" << endl;
                }
                else {
                    cout << "Unknown" << endl;
                }
            }
        }
    }
    else {
        // Handle the error
        if (status == STAT_SUCCESS) {
            cout << "Error in packet: " << snmp_errstring(response->errstat) << endl;
        }
        else {
            cout << "SNMP error: " << snmp_api_errstring(status) << endl;
        }
    }

    // Clean up
    if (response) {
        snmp_free_pdu(response);
    }

    snmp_close(&session);

    return 0;
}

getConfig.cpp：

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <vector>
#include <algorithm>
using namespace std;
typedef struct{
    string ip;//IP地址
    vector<int> oid;//oid
    string communityStr;//社区字符串
}Config;
//得到：后面的字符串
string getLastStr(string str){
    string res=str.substr(str.find(":")+1);
    return res;
}
//把1.12.123变成int数组
vector<int> strToIntArray(string str){
    stringstream ss(str);//
    vector<int> res;
    string token;
    while (getline(ss,token,'.'))
    {
       int num=stoi(token);
       res.push_back(num);
    }
    return res;
}
//读取config.txt文件
Config readConfigTxt(string& path){
    Config res;
    ifstream file(path,std::ios::binary);
    if(!file){
        cout<<"Failed to open file"<<endl;
        return res;
    }
    string line;
    while (getline(file,line))
    {
        //ip
        line=getLastStr(line);
        res.ip=line;
        //oid
        getline(file,line);
        line=getLastStr(line);
        res.oid=strToIntArray(line);
        //communityStr
        getline(file,line);
        line=getLastStr(line);
        res.communityStr=line;
    }
    
}
int main(){
    string path="/home/xyt/work/vsCode/getSnmp/config.txt";
    Config res=readConfigTxt(path);
    //ip
    cout<<res.ip<<endl;
    //oid
    vector<int> a=res.oid;
    int len=a.size();
    int oidArr[len];
    for (int i = 0; i < len; i++)
    {
        oidArr[i]=a[i];
    }
    //遍历oidArr
    for (int i = 0; i < len; i++)
    {
        cout<<oidArr[i]<<" ";
    }
    cout<<endl;
    //communityStr
    cout<<res.communityStr<<endl;
    
    
}

代码还没有整合