nagios插件之监控tcp的established数量

最新推荐文章于 2025-08-03 16:03:51 发布

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最新推荐文章于 2025-08-03 16:03:51 发布

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分类专栏： c基础文章标签： nagios插件

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本文介绍了一个用于检查TCP连接状态的脚本工具。该工具通过解析netstat命令的输出来判断指定本地IP和远程IP之间的连接是否处于已建立状态，并据此返回不同的检查结果。

vi check_tcp_established_status.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define OK       0
#define WARNING  1
#define CRITICAL 2
#define UNKNOWN  3

#define LEN 1000

//#define TCL_CMD "/home/weihu/tcl/"
#define TCL_CMD "/usr/local/nagios/libexec/"

int exitstatus=OK;
char *exit_status[4]={"OK","WARNING","CRITICAL","UNKNOWN"};

char status_information[LEN];
char performance_data[LEN];

//
char loss_packet[32];
char ping_min[32];
char ping_avg[32];
char ping_max[32];
char ping_unit[32];

int mark=0;
char readbuf[LEN];
int established_count=0;

//int parse_status(char *sh_cmd,char *active_status,char *active_ip_addr) {
int parse_status(char *sh_cmd,char *argv1_str,char *argv2_str) {
        int ret;
        FILE *fp;

        char *p,*str;

        int line=0;
        int mark1=0;
        int mark2=0;

        int i;

//      fp=popen("/home/neo/check_log/tcl/auto_ssh.sh","r");
        fp=popen(sh_cmd,"r");
        if(fp==NULL) {
                fprintf(stderr,"popen() error. ");
                exitstatus=CRITICAL;
                printf("%s: - %s | %s\n",exit_status[exitstatus],status_information,performance_data);
                exit(exitstatus);
        }

        while(fgets(readbuf,LEN,fp)!=NULL) {
                line++;
        //      printf("line=%d,readbuf=%s",line,readbuf);

                if(strstr(readbuf,argv1_str) && strstr(readbuf,argv2_str) && strstr(readbuf,"ESTABLISHED")) {
                        mark=1;
                //      printf("---------------------------------------------------------------------\n");

                        //delete "\n"
                        i=strlen(readbuf);
                        if(readbuf[i-1]=='\n') {
                                readbuf[i-1]='\0';
                        }
                }
        }

//      printf("line=%d\n",line);
        established_count=line;

        ret=fclose(fp);
        if(fp==NULL) {
                fprintf(stderr,"popen() error.\n");
                return -1;
        }

        return 0;
}

int main(int argc, char *argv[]) {
        int ret;
        char sh_cmd[LEN];

        char active_status[LEN];
        char active_ip_addr[LEN];

        char argv1_str[LEN];
        char argv2_str[LEN];

        if(argc<3) {
                printf("%s %s\n",argv[0],"localip remoteip");
                exit(-1);
        }

        strcpy(argv1_str,argv[1]);
        strcpy(argv2_str,argv[2]);
//      printf("argv1_str=%s,argv2_str=%s\n",argv1_str,argv2_str);

//      sprintf(sh_cmd,"%s%s",TCL_CMD,argv[1]);
//      sprintf(sh_cmd,"%s%s%s","netstat -utupl | grep ",argv[1],argv[2]);
//      sprintf(sh_cmd,"%s%s","netstat -ntul | grep -w ",argv[1]);
//      sprintf(sh_cmd,"%s%s","netstat -nul | grep -w ",argv[1]);
        sprintf(sh_cmd,"%s%s","netstat -ant | grep ",argv[1]);
//      sprintf(sh_cmd,"%s%s","| grep",argv[2]);
        strcat(sh_cmd,"| grep -w ");
        strcat(sh_cmd,"\"");
        strcat(sh_cmd,argv[2]);
        strcat(sh_cmd,"\"");
//      printf("sh_cmd=%s\n",sh_cmd);

//      ret=parse_status(sh_cmd,active_status,active_ip_addr);
        ret=parse_status(sh_cmd,argv1_str,argv1_str);
        if(ret!=0) {
                fprintf(stderr,"parse_status() error.\n");
                exit(-1);
        }

//      printf("active_status=%s\n",active_status);
//      printf("active_ip_addr=%s\n",active_ip_addr);

        memset(status_information,0,LEN);
        memset(performance_data,0,LEN);

        if(mark==1) {
                exitstatus=OK;
        //      sprintf(status_information,"%s",readbuf);
                sprintf(status_information,"%s, count=%d",readbuf,established_count);
        }
        else if(mark==0) {
                exitstatus=CRITICAL;
                sprintf(status_information,"%s%s",argv[2]," is not exist.");
        }
        else    {
                exitstatus=UNKNOWN;
                sprintf(status_information,"%s%s",argv[2]," is unknow.");
        }



//      sprintf(performance_data,"rta=%s%s;200.000;500.000;0; pl=%s;40;80;; rtmax=%s%s;;;; rtmin=%s%s;;;;",ping_avg,ping_unit,loss_packet,ping_max,ping_unit,ping_min,ping_unit); 

        //|rta=0.056ms;200.000;500.000;0; pl=0%;40;80;; rtmax=0.084ms;;;; rtmin=0.029ms;;;; 

/*
        if(strstr(argv[1],"80_49")) {
                printf("%s - 10.7.0.186: %s | %s\n",exit_status[exitstatus],status_information,performance_data);
        }

        if(strstr(argv[1],"80_50")) {
                printf("%s - 10.7.0.195: %s | %s\n",exit_status[exitstatus],status_information,performance_data);
        }
*/

        printf("%s - : %s | %s\n",exit_status[exitstatus],status_information,performance_data);

        return exitstatus;
}