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Filename : check_if_ips.py
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#!/usr/libexec/platform-python

# version 2016/12/13
# writen by v.burov

# Requirements:
# you need to allow fillowing commands:
# "/bin/ping","ip","sed"
# Please pay attention that it's necessary to add access to sudoers file for /bin/ping if it is not SUID


import os, stat, re, sys, time, argparse
from subprocess import Popen, PIPE

ellist=''
redlist=''
PING = '/bin/ping'
SUDO = '/usr/bin/sudo'
def check_sudo_usable():
    """Checks that the SUDO program and path are correct and usable - that the program exists and is executable, otherwise exits with error."""
    if not os.path.exists(SUDO):
            end(UNKNOWN, "%s cannot be found" % SUDO)
    elif not os.path.isfile(SUDO):
            end(UNKNOWN, "%s is not a file" % SUDO)
    elif not os.access(SUDO, os.X_OK):
            end(UNKNOWN, "%s is not executable" % SUDO)

def get_server_ips():
    # Python 2 version;
    #ips = Popen("ip -4 -o a|sed  -e '/inet 127\|inet 10\\.\|inet 172\|inet 192\\.168/d' -e 's/.*inet \(.*\)\/.*/\\1/'", stdout=PIPE, shell=True).stdout.read().split('\n')
    ips = Popen("ip -4 -o a|sed  -e '/inet 127\|inet 10\\.\|inet 100\\.100\\.0\\.\|inet 172\|inet 192\\.168/d' -e 's/.*inet \(.*\)\/.*/\\1/'", stdout=PIPE, shell=True).stdout.read().decode('UTF-8').split('\n')
    return ips

def ping_to_float(s):
    try:
        return float(s)
    except ValueError:
        return 5000.1

def add_redlist(s):
    global redlist
    if redlist=='':
         redlist='CRITICAL - '+s
    else:
         redlist+=', '+s

def add_ellist(s):
    global ellist
    if ellist=='':
         ellist='Warning - '+s
    else:
         ellist+=', '+s

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("-v","--verbose", default=False, action="store_true", help="Extra output")
    parser.add_argument("destination", nargs='?', default="nagios.web-hosting.com", help="Destination")
    args = parser.parse_args()


ips=[]
ips=get_server_ips()
#print(ips)
pingoutputmatch=re.compile("icmp\S+=(\d+)\s+\S+\s+time=(\S+)\s+")

destination = args.destination

if args.verbose : print("Destination = {}".format(destination))


use_sudo = False
if not os.stat(PING).st_mode & stat.S_ISUID:
    if args.verbose : print("/bin/ping is not SUID: have to use sudo")
    check_sudo_usable()
    use_sudo = True


running_procs={}
result={}
for s in ips:
    if len(s) == 0:
         continue
    if use_sudo :
        running_procs[s]=Popen([SUDO, PING,'-I', s, '-A','-n','-c','3','-W','1',destination], stdout=PIPE, stderr=PIPE)
    else:
        running_procs[s]=Popen([PING,'-I', s, '-A', '-n', '-c', '3', '-W', '1', destination], stdout=PIPE, stderr=PIPE)
    result[s] = ['-','-','-']


i1=0
while running_procs :
    i1+=1
    if i1>1000 :
        print("Script error: loop")
        sys.exit(3)
    for ip in running_procs.keys():
        proc = running_procs[ip]
        retcode = proc.poll()
        if retcode is not None: # Process finished.
            del running_procs[ip]
            break
        else: # No process is done, wait a bit and check again.
            time.sleep(.1)
            continue
    retcode = proc.poll()
    if retcode is None:
        time.sleep(.1)
        continue
    i2=0
    for output in iter(proc.stdout.readline,b'') :
        p=pingoutputmatch.search(output.decode('UTF-8'))
        if p:
            result[ip][int(p.group(1))-1] = p.group(2)
            if args.verbose : print("%{} seq={}s time={}s ms".format(ip, p.group(1), p.group(2)))


for ip in result.keys():
    if args.verbose : print("ip+{}{}{} ".format(result[ip][0],result[ip][1],result[ip][2]))
    if result[ip][0]=='-' and result[ip][1]=='-' and result[ip][2]=='-':
        add_redlist(ip)
    else:
        p1=ping_to_float(result[ip][0])
        p2=ping_to_float(result[ip][1])
        p3=ping_to_float(result[ip][2])
        if p1>400 and p2>400 and p3>400 :
            add_redlist('%s(%s;%s;%s)' % (ip,result[ip][0],result[ip][1],result[ip][2]))
        elif p1>200 and p2>200 and p3>200 :
            add_ellist('%s(%s;%s;%s)' % (ip,result[ip][0],result[ip][1],result[ip][2]))
if len(redlist)>0 :
    print("{}{}".format(redlist,ellist))
    sys.exit(2)
if len(ellist)>0 :
    print(ellist)
    sys.exit(1)
print("OK")