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101 lines
2.6 KiB
Python
101 lines
2.6 KiB
Python
#!/usr/bin/python
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# Usage: dhcpd_edithosts.py mac ip hostname dns gateway nextserver
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import sys, os
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from os.path import exists
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from time import sleep
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from os import remove
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usage = '''dhcpd_edithosts.py mac ip hostname dns gateway nextserver'''
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conf_path = "/etc/dhcpd.conf"
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file_lock = "/etc/dhcpd.conf_locked"
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sleep_max = 20
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host_entry = 'host %s { hardware ethernet %s; fixed-address %s; option domain-name-servers %s; option domain-name "%s"; option routers %s; default-lease-time infinite; max-lease-time infinite; min-lease-time infinite;}'
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host_entry1 = 'host %s { hardware ethernet %s; fixed-address %s; option domain-name-servers %s; option domain-name "%s"; option routers %s; default-lease-time infinite; max-lease-time infinite; min-lease-time infinite; next-server %s;}'
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def lock():
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if exists(file_lock):
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count = 0
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while(exists(file_lock)):
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sleep(1)
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count = count + 1
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if count > sleep_max:
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print "Can not get file lock at %s, time expired" % file_lock
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return False
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try:
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f = open(file_lock, "w")
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f.close()
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return True
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except IOError,e:
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print "Cannot create file lock at /etc/dhcpd.conf_locked,", e
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return False
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def unlock():
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if exists(file_lock) == False:
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print "Cannot find %s when unlocking, race condition happens" % file_lock
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else:
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try:
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remove(file_lock)
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return True
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except IOError, e:
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print "Cannot remove file lock at %s" % file_lock
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return False
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def insert_host_entry(mac, ip, hostname, dns, gateway, next_server):
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if lock() == False:
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return 1
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cmd = 'sed -i /"fixed-address %s"/d %s' % (ip, conf_path)
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ret = os.system(cmd)
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if ret != 0:
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print "Command %s failed" % cmd
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unlock()
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return 1
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cmd = 'sed -i /"hardware ethernet %s"/d %s' % (mac, conf_path)
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ret = os.system(cmd)
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if ret != 0:
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print "Command %s failed" % cmd
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unlock()
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return 1
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if next_server != "null":
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entry = host_entry1 % (hostname, mac, ip, dns, "cloudnine.internal", gateway, next_server)
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else:
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entry = host_entry % (hostname, mac, ip, dns, "cloudnine.internal", gateway)
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cmd = '''echo '%s' >> %s''' % (entry, conf_path)
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ret = os.system(cmd)
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if ret != 0:
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print "Command %s failed" % cmd
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unlock()
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return 1
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cmd = 'service dhcpd restart'
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ret = os.system(cmd)
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if ret != 0:
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print "Command %s failed" % cmd
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unlock()
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return 1
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if unlock() == False:
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return 1
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return 0
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if __name__ == "__main__":
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if len(sys.argv) < 7:
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print usage
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sys.exit(1)
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mac = sys.argv[1]
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ip = sys.argv[2]
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hostname = sys.argv[3]
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dns = sys.argv[4]
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gateway = sys.argv[5]
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next_server = sys.argv[6]
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ret = insert_host_entry(mac, ip, hostname, dns, gateway, next_server)
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sys.exit(ret)
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