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fence_ifmib.py

#!/usr/bin/python

# The Following agent has been tested on:
# - Cisco MDS UROS 9134 FC (1 Slot) Chassis ("1/2/4 10 Gbps FC/Supervisor-2") Motorola, e500v2
#   with BIOS 1.0.16, kickstart 4.1(1c), system 4.1(1c)
# - Cisco MDS 9124 (1 Slot) Chassis ("1/2/4 Gbps FC/Supervisor-2") Motorola, e500
#   with BIOS 1.0.16, kickstart 4.1(1c), system 4.1(1c)
# - Partially with APC PDU (Network Management Card AOS v2.7.0, Rack PDU APP v2.7.3)
#   Only lance if is visible

import sys, re, pexpect
sys.path.append("@FENCEAGENTSLIBDIR@")
from fencing import *
from fencing_snmp import *

#BEGIN_VERSION_GENERATION
RELEASE_VERSION="IF:MIB SNMP fence agent"
REDHAT_COPYRIGHT=""
BUILD_DATE=""
#END_VERSION_GENERATION

### CONSTANTS ###
# IF-MIB trees for alias, status and port
ALIASES_OID=".1.3.6.1.2.1.31.1.1.1.18"
PORTS_OID=".1.3.6.1.2.1.2.2.1.2"
STATUSES_OID=".1.3.6.1.2.1.2.2.1.7"

# Status constants returned as value from SNMP
STATUS_UP=1
STATUS_DOWN=2
STATUS_TESTING=3

### GLOBAL VARIABLES ###
# Port number converted from port name or index
port_num=None

### FUNCTIONS ###

# Convert port index or name to port index
def port2index(conn,port):
      res=None

      if (port.isdigit()):
            res=int(port)
      else:
            ports=conn.walk(PORTS_OID,30)

            for x in ports:
                  if (x[1].strip('"')==port):
                        res=int(x[0].split('.')[-1])
                        break

      if (res==None):
            fail_usage("Can't find port with name %s!"%(port))

      return res

def get_power_status(conn,options):
      global port_num

      if (port_num==None):
            port_num=port2index(conn,options["-n"])

      (oid,status)=conn.get("%s.%d"%(STATUSES_OID,port_num))
      return (status==str(STATUS_UP) and "on" or "off")

def set_power_status(conn, options):
      global port_num

      if (port_num==None):
            port_num=port2index(conn,options["-n"])

      conn.set("%s.%d"%(STATUSES_OID,port_num),(options["-o"]=="on" and STATUS_UP or STATUS_DOWN))

# Convert array of format [[key1, value1], [key2, value2], ... [keyN, valueN]] to dict, where key is
# in format a.b.c.d...z and returned dict has key only z
def array_to_dict(ar):
      return dict(map(lambda y:[y[0].split('.')[-1],y[1]],ar))

def get_outlets_status(conn, options):
      result={}

      res_fc=conn.walk(PORTS_OID,30)
      res_aliases=array_to_dict(conn.walk(ALIASES_OID,30))

      for x in res_fc:
            port_num=x[0].split('.')[-1]

            port_name=x[1].strip('"')
            port_alias=(res_aliases.has_key(port_num) and res_aliases[port_num].strip('"') or "")
            port_status=""
            result[port_name]=(port_alias,port_status)

      return result

# Define new options
def ifmib_define_defaults():
      all_opt["snmp_version"]["default"]="2c"

# Main agent method
def main():
      global port_oid

      device_opt = [ "help", "version", "agent", "quiet", "verbose", "debug",
                   "action", "ipaddr", "login", "passwd", "passwd_script",
                   "test", "port", "separator", "no_login", "no_password",
                   "snmp_version", "community", "snmp_auth_prot", "snmp_sec_level",
                   "snmp_priv_prot", "snmp_priv_passwd", "snmp_priv_passwd_script",
                   "udpport","inet4_only","inet6_only",
                   "power_timeout", "shell_timeout", "login_timeout", "power_wait" ]

      atexit.register(atexit_handler)

      snmp_define_defaults ()

      options=process_input(device_opt)

      # Emulate enable/disable functionality
      if (options.has_key("-o")):
            options["-o"]=options["-o"].lower()

            if (options["-o"]=="enable"):
                  options["-o"]="on"
            if (options["-o"]=="disable"):
                  options["-o"]="off"
      else:
            options["-o"]="off"

      options = check_input(device_opt, options)

      docs = { }
      docs["shortdesc"] = "Fence agent for IF MIB"
      docs["longdesc"] = "fence_ifmib is an I/O Fencing agent \
which can be used with any SNMP IF-MIB capable device. \
\n.P\n\
It was written with managed ethernet switches in mind, in order to \
fence iSCSI SAN connections. However, there are many devices that \
support the IF-MIB interface. The agent uses IF-MIB::ifAdminStatus \
to control the state of an interface."
      docs["vendorurl"] = "http://www.ietf.org/wg/concluded/ifmib.html"
      show_docs(options, docs)

      # Operate the fencing device
      result = fence_action(FencingSnmp(options), options, set_power_status, get_power_status, get_outlets_status)
      
      sys.exit(result)

if __name__ == "__main__":
      main()

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