Nagios插件之登陆防火墙实现Session监控

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ssh_firewall_session.sh — 登陆防火墙并执行 dis session statistics

firewall_check_sessions.c — 调用上面脚本，过滤出 sessioin 的数值

执行：./firewall_check_sessions ssh_firewall_session.sh 192.168.0.1

vi ssh_firewall_session.sh

#!/usr/bin/expect -f

#set port 22
set user xxxxxx
set host [lindex $argv 0 0]
set password xxxxxx
set timeout 30

expect “*assword:*”
send “$password\r”

expect “*FW*”
send “display session statistics\r”

expect “*FW*”
send “quit”

vi firewall_check_sessions.c

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

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

#define LEN 1000L
#define MIN_LEN 32L

//#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];

//save session
char cur_session[MIN_LEN]={0};
char tcp_session[MIN_LEN]={0};
char half_open[MIN_LEN]={0};
char half_close[MIN_LEN]={0};
char udp_session[MIN_LEN]={0};
char icmp_session[MIN_LEN]={0};
char rawip_session[MIN_LEN]={0};

int parse_status(char *sh_cmd,char *active_status,char *active_ip_addr) {
int ret;
FILE *fp;
char readbuf[LEN];

char *p,*str;

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

char tmp1[LEN];
char tmp2[LEN];
char tmp3[LEN];
char tmp4[LEN];

// 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,”Current session”)) {
sscanf(readbuf,”Current session(s):%s”,cur_session);
// printf(“cur_session=%s\n”,cur_session);
}

if(strstr(readbuf,”TCP session”)) {
sscanf(readbuf,” Current TCP session(s): %s”,tcp_session);
// printf(“tcp_session=%s\n”,tcp_session);
}

if(strstr(readbuf,”Half-Open”)) {
sscanf(readbuf,” Half-Open: %s Half-Close: %s”,half_open,half_close);
// printf(“half_open=%s,half_close=%s\n”,half_open,half_close);
}

if(strstr(readbuf,”UDP session”)) {
sscanf(readbuf,” Current UDP session(s): %s”,udp_session);
// printf(“udp_session=%s\n”,udp_session);
}

if(strstr(readbuf,”ICMP session”)) {
sscanf(readbuf,” Current ICMP session(s): %s”,icmp_session);
// printf(“icmp_session=%s\n”,icmp_session);
}

if(strstr(readbuf,”RAWIP session”)) {
sscanf(readbuf,” Current RAWIP session(s): %s”,rawip_session);
// printf(“rawip_session=%s\n”,rawip_session);
break;
}

/*
if(line==3) {
for(p=strtok(readbuf,” “);p;p=strtok(NULL,” “)) {
// str=p;

//Sun
mark1++;

if(mark1==2) {
// printf(“p=%s\n”,p);

strcpy(active_status,p);
// printf(“active_status=%s\n”,active_status);
}
}
}

if(line==4) {
for(p=strtok(readbuf,” “);p;p=strtok(NULL,” /”)) {
mark2++;

if(mark2==2) {
// printf(“p=%s\n”,p);

strcpy(active_ip_addr,p);
// printf(“active_ip_addr=%s\n”,active_ip_addr);
}
}

break;
}
*/
}

// printf(“line=%d\n”,line);

ret=pclose(fp);
if(ret==-1) {
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];

if(argc<=1) {
printf(“%s %s\n”,argv[0],”auto_ssh_firewall_dis_session.sh + ip”);
exit(-1);
}

sprintf(sh_cmd,”%s%s %s”,TCL_CMD,argv[1],argv[2]);
// printf(“sh_cmd=%s\n”,sh_cmd);

ret=parse_status(sh_cmd,active_status,active_ip_addr);
if(ret!=0) {
fprintf(stderr,”parse_status() error.\n”);

sprintf(status_information,”cur_session=%s, tcp_session=%s, half_open=%s, half_close=%s udp_session=%s icmp_session=%s, rawip_session=%s”, cur_session, tcp_session, half_open, half_close, udp_session, icmp_session, rawip_session);

sprintf(performance_data,”cur_session=%s;;;; tcp_session=%s;;;; half_open=%s;;;; half_close=%s;;;; udp_session=%s;;;; icmp_session=%s;;;; rawip_session=%s;;;;”, cur_session, tcp_session, half_open, half_close, udp_session, icmp_session, rawip_session);

exitstatus=CRITICAL;
printf(“%s – %s | %s\n”, exit_status[exitstatus], status_information, performance_data);

return exitstatus;
}

/*
// printf(“active_status=%s\n”,active_status);
// printf(“active_ip_addr=%s\n”,active_ip_addr);

// if(atoi(ping_avg)<200 && atoi(loss_packet)==0) {
if(atoi(ping_avg)<200 && atoi(loss_packet_int)==0) {
exitstatus=OK;
}
// else if(atoi(ping_avg)>=200 && atoi(ping_avg)<500 || atoi(loss_packet)>=10 && atoi(loss_packet)<=50) {
else if(atoi(ping_avg)>=200 && atoi(ping_avg)<500 || atoi(loss_packet_int)>=10 && atoi(loss_packet_int)<=50) {
exitstatus=WARNING;
}
// else if(atoi(ping_avg)>=500 || atoi(loss_packet)>50) {
else if(atoi(ping_avg)>=500 || atoi(loss_packet_int)>50) {
exitstatus=CRITICAL;
}
else {
exitstatus=CRITICAL;
}

// sprintf(status_information,”rta %s%s, loss %s”,ping_avg,ping_unit,loss_packet);
sprintf(status_information,”rta %s%s, loss %s%%”,ping_avg,ping_unit,loss_packet_int);

// 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);
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_int,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 – 192.20.198.121: %s | %s\n”,exit_status[exitstatus],status_information,performance_data);
}

if(strstr(argv[1],”80_50″)) {
printf(“%s – 192.20.198.181: %s | %s\n”,exit_status[exitstatus],status_information,performance_data);
}

return exitstatus;
*/

sprintf(status_information,”cur_all_session=%s, tcp_all_session=%s, tcp_half_open=%s, tcp_half_close=%s udp_session=%s icmp_session=%s, rawip_session=%s”, cur_session, tcp_session, half_open, half_close, udp_session, icmp_session, rawip_session);

sprintf(performance_data,”cur_all_session=%s;;;; tcp_all_session=%s;;;; tcp_half_open=%s;;;; tcp_half_close=%s;;;; udp_session=%s;;;; icmp_session=%s;;;; rawip_session=%s;;;;”, cur_session, tcp_session, half_open, half_close, udp_session, icmp_session, rawip_session);

printf(“%s – %s | %s\n”, exit_status[exitstatus], status_information, performance_data);

return exitstatus;
}

————————————– 分割线 ————————————–

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