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hierarchical_configuration.py
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hierarchical_configuration.py
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import re
import sys
import copy
from text_match import TextMatch
class HierarchicalConfiguration(object):
"""
A class for representing and comparing Cisco running configurations in a
hierarchical tree data structure. An instance represents one line of
a configuration. Each instance has text, indentation, and a list of child items.
Example usage:
#Setup variables needed by HierarchicalConfiguration
hier_tags = self.host_variable_space['hier_tags']
hier_options = dict()
hier_options.update(self.host_variable_space['hier_options'])
#Build HierarchicalConfiguration object for the Running Config
running_config_hier = HierarchicalConfiguration(options=hier_options)
running_config_hier.from_file(self.options['running_config_file'])
print running_config_hier.logs.getvalue()
#Build HierarchicalConfiguration object for the Compiled Config
compiled_config_hier = HierarchicalConfiguration(options=hier_options)
compiled_config_hier.from_file(self.options['compiled_config_file'])
print running_config_hier.logs.getvalue()
#Build HierarchicalConfiguration object for the Remediation Config
remediation_config_hier = compiled_config_hier.deep_diff_tree_with(running_config_hier)
remediation_config_hier.add_sectional_exiting()
remediation_config_hier.add_tags(hier_tags)
remediation_config = remediation_config_hier.to_detailed_ouput()
print remediation_config_hier.logs.getvalue()
#Example supporting data structures
hier_options:
#Enabled/Disables idempotent ACL handling for IOS-XR
idempotent_acl_iosxr: true
#if there is a delta, overwrite these parents instead of one of their children
sectional_overwrite:
- ^template
sectional_overwrite_no_negate:
- ^as-path-set
- ^prefix-set
- ^route-policy
- ^extcommunity-set
- ^community-set
parent_allows_duplicate_child:
- ^route-policy
sectional_exiting:
- parent_expression: ^route-policy
exit_text: end-policy
- parent_expression: ^policy-map
exit_text: end-policy-map
#adds +1 indent to lines following start_expression and removes the +1 indent for lines following end_expression
indent_adjust:
- start_expression: ^\s*template
end_expression: ^\s*end-template
#substitions against the full multi-line config text
full_text_sub:
- search: 'banner exec (\^?\S)\w*\n(.*\n)+\\1\s*\n'
replace: ''
- search: 'banner motd (\^?\S)\w*\n(.*\n)+\\1\s*\n'
replace: ''
#substitions against each line of the config text
per_line_sub:
- search: ^Building configuration.*
replace: ''
- search: .*message-digest-key.*
replace: ''
- search: .*password.*
replace: ''
idempotent_commands_blacklist: []
#These commands do not require negation, they simply overwrite themselves
idempotent_commands:
- ^\s*cost
- logging \d+.\d+.\d+.\d+ vrf MGMT
- soft-reconfiguration inbound
#Default when expression: list of expressions
negation_default_when: []
#- expressions
#Negate substitutions: expression -> negate with
negation_negate_with: []
#- match: expression
# use: command
hier_tags:
safe:
- lineage:
- startswith: snmp
action: add
- lineage:
- contains: ACL-VTY-IP
action: add
- lineage:
- equals: policy-map INFRA_L3VPN
action: add
- lineage:
- startswith: router bgp
- startswith: neighbor-group
- startswith: address-family
- re_search: route-policy (DENY|DROP)
action: add
- lineage:
- startswith: interface
- equals: no carrier-delay up 0 down 0
action: add
pacl:
- lineage:
- startswith: ipv4 access-list pacl_ipv4
action: add
- lineage:
- startswith: ipv6 access-list pacl_ipv6
action: add
"""
def __init__(
self, parent=None, text=None, indent_level=None, options=None):
if text is None:
self.text = text
else:
self.text = text.strip()
self.parent = parent
if self._is_base_instance():
self.indent_level = -1
self.options = options
self.logs = list()
else:
self.indent_level = indent_level
self.options = self.parent.options
self.logs = self.parent.logs
self.children = []
# The intent is for self.order_weight values to range from 1 to 999
# with the default weight being 500
self.order_weight = 500
self.tags = []
self.comment = ''
self.post_exec_sleep = 0
self.post_exec_string = ''
self.new_in_config = False
def __repr__(self):
return 'HierarchicalConfiguration({}, {})'.format(
self.text,
self.indent_level)
def __str__(self):
return self.text
def __lt__(self, other):
if self.order_weight < other.order_weight:
return True
else:
return False
def _is_base_instance(self):
""" Check if this instance is the base instance in the hierarchy """
if self.parent is None:
return True
else:
return False
def _delete(self):
""" Delete the current object from its parent """
self.parent.children[:] = [
c for c in self.parent.children if not id(self) == id(c)]
def _child_exists(self, text):
""" Determine if child exists given the text of the child """
for child in self.children:
if child.text == text:
return True
return False
def get_child(self, test, expression):
""" Find a child by TextMatch rule. If it is not found, return None """
children = self.get_children(test, expression)
if children:
return children[0]
else:
return None
def get_children(self, test, expression):
""" Find all children matching a TextMatch rule and return them. """
matching_children = list()
for child in self.children:
if TextMatch.dict_call(test, child.text, expression):
matching_children.append(child)
return matching_children
def del_child(self, text):
""" Delete all children with the provided text """
self.children[:] = [c for c in self.children if c.text != text]
@staticmethod
def _lineage_eval_object_rules(rules, section):
"""
Evaluate a list of lineage object rules.
All object rules must match in order to return True
"""
matches = 0
for rule in rules:
if rule['test'] == 'new_in_config':
if rule['expression'] == section.new_in_config:
matches += 1
elif rule['test'] == 'negative_intersection_tags':
if isinstance(rule['expression'], basestring):
rule['expression'] = [rule['expression']]
if not set(rule['expression']).intersection(section.tags):
matches += 1
if matches == len(rules):
return True
else:
return False
@staticmethod
def _lineage_eval_text_match_rules(rules, text):
"""
Evaluate a list of lineage text_match rules.
Only one text_match rule must match in order to return True
"""
for rule in rules:
if TextMatch.dict_call(rule['test'], text, rule['expression']):
return True
return False
@staticmethod
def _explode_lineage_rule(rule):
text_match_rules = list()
object_rules = list()
for k, v in rule.iteritems():
if k in ['new_in_config', 'negative_intersection_tags']:
object_rules.append({'test': k, 'expression': v})
elif isinstance(v, list):
text_match_rules += [{'test': k, 'expression': e} for e in v]
else:
text_match_rules += [{'test': k, 'expression': v}]
return(object_rules, text_match_rules)
def _lineage_test(self, rule, strip_negation=False):
""" A generic test against a lineage of HierarchicalConfiguration objects """
lineage = self._lineage()
if rule['lineage'] and 'match_leaf' in rule[
'lineage'][0] and rule['lineage'][0]['match_leaf']:
lineage = [lineage[-1]]
del(rule['lineage'][0]['match_leaf'])
if 'debug' in rule and rule['debug']:
debug = True
else:
debug = False
if not len(rule['lineage']) == len(lineage):
return False
matches = 0
if debug:
print "lineage_rule ", rule['lineage']
print "lineage ", [l.text for l in lineage]
for lineage_rule, section in zip(rule['lineage'], lineage):
object_rules, text_match_rules = HierarchicalConfiguration._explode_lineage_rule(
lineage_rule)
if debug:
print "lineage_rule ", lineage_rule
print "section.text ", section.text
if not HierarchicalConfiguration._lineage_eval_object_rules(
object_rules, section):
if debug:
print "object rule failed and fully failed"
print " section.new_in_config", section.new_in_config
print " section.tags", section.tags
return False
else:
if debug:
print "object rule passed"
# This removes negations for each section but honestly,
# we really only need to do this on the last one
if strip_negation:
if section.text.startswith('no '):
text = section.text[3:]
elif section.text.startswith('default '):
text = section.text[8:]
else:
text = section.text
else:
text = section.text
if HierarchicalConfiguration._lineage_eval_text_match_rules(
text_match_rules, text):
matches += 1
if debug:
print "rule text_match passed"
continue
else:
if debug:
print "rule text_match failed and fully failed"
return False
if matches == len(rule['lineage']):
if debug:
print "rule fully passed"
return True
else:
if debug:
print "rule fully failed"
return False
def _duplicate_child_allowed_check(self):
""" Determine if duplicate(identical text) children are allowed under the parent """
for rule in self.options['parent_allows_duplicate_child']:
if self._lineage_test(rule):
return True
return False
def add_child(
self, text, indent_level=None, alert_on_duplicate=False, idx=None):
if idx is None:
idx = len(self.children)
""" Add a child instance of HierarchicalConfiguration """
if not self._child_exists(text):
new_item = HierarchicalConfiguration(self, text, indent_level)
self.children.insert(idx, new_item)
return new_item
elif self._duplicate_child_allowed_check():
new_item = HierarchicalConfiguration(self, text, indent_level)
self.children.insert(idx, new_item)
return new_item
else:
# If the child is already present and the parent does not allow
# duplicate children, return the existing child
if alert_on_duplicate:
path = self._path() + [text]
self.logs.append("Found a duplicate section: {}".format(path))
return self.get_child('equals', text)
def _add_shallow_copy_of(self, child_to_add):
""" Add a nested copy of a child to self"""
new_child = self.add_child(
copy.copy(child_to_add.text),
copy.copy(child_to_add.indent_level)
)
new_child.comment = copy.copy(child_to_add.comment)
new_child.tags = copy.copy(child_to_add.tags)
return new_child
def _add_deep_copy_of(self, child_to_add):
""" Add a nested copy of a child to self"""
new_child = self._add_shallow_copy_of(child_to_add)
for child in child_to_add.children:
new_child._add_deep_copy_of(child)
return new_child
def _lineage(self):
"""
Return the lineage of parent objects, up to but excluding the root
"""
if self.parent:
parents = self.parent._lineage()
return parents + [self]
else:
return []
def _path(self):
"""
Return a list of the text instance variables from self.lineage
"""
path = [c.text for c in self._lineage()]
return path
def _cisco_style_text(self):
""" Return a Cisco style formated line i.e. indentation_level + text """
the_text = "{}{}".format(" " * self.indent_level, self.text)
return the_text
# We will worry about this later
# def type_7_password_decrypt(self, text):
# decrypt=lambda x:''.join([chr(int(x[i:i+2],16)^ord('dsfd;kfoA,.iyewrkldJKDHSUBsgvca69834ncxv9873254k;fg87'[(int(x[:2])+i/2-1)%53]))for i in range(2,len(x),2)])
# return decrypt(text)
def _all_children_sorted(self):
""" Recursively find and return all children sorted at each hierarchy """
found_children = []
for child in sorted(self.children):
found_children += child._all_children_sorted()
if self._is_base_instance():
return found_children
else:
return [self] + found_children
def _all_children(self):
""" Recursively find and return all children """
found_children = []
for child in self.children:
found_children += child._all_children()
if self._is_base_instance():
return found_children
else:
return [self] + found_children
def _sectional_overwrite_no_negate_check(self):
"""
Check self's text to see if negation should be handled by
overwriting the section without first negating it
"""
for rule in self.options['sectional_overwrite_no_negate']:
if self._lineage_test(rule):
return True
return False
def _sectional_overwrite_check(self):
""" Determines if self.text matches a sectional overwrite rule """
for rule in self.options['sectional_overwrite']:
if self._lineage_test(rule):
return True
return False
def _resequence_acl_check(self):
"""
Is the object an ACL and is ACL resequencing enabled
"""
if self.options['style'] in ['ios']:
acl_sw = ('ip access-list')
if self.text.startswith(acl_sw):
return True
return False
def _resequence_acl(self, delta):
""" Inserts an ACL resequence command """
acl_name = self.text.split(' ')[3]
for idx, child in enumerate(delta.children):
if child.text == self.text:
index = idx
break
resquence = delta.add_child(
"ip access-list resequence {} 10 10".format(acl_name),
self.indent_level,
idx=index
)
resquence.comment = "added acl resequence"
return delta
def _overwrite_with(self, other, delta, negate=True):
""" Deletes delta.child[self.text], adds a deep copy of self to delta """
if other.children != self.children:
if negate:
delta.del_child(self.text)
deleted = delta.add_child(
self.text, self.indent_level).negate()
deleted.comment = "dropping entire section"
if self.children:
delta.del_child(self.text)
new_item = delta._add_deep_copy_of(self)
new_item.comment = "re-create section from scratch"
return delta
def set_order_weight(self):
"""
Sets self.order integer on all children
"""
for child in self._all_children():
for rule in self.options['ordering']:
if child._lineage_test(rule):
child.order_weight = rule['order']
def add_sectional_exiting(self):
"""
Adds the sectional exiting text as a child
"""
for child in self._all_children():
for rule in self.options['sectional_exiting']:
if child._lineage_test(rule):
if child._child_exists(rule['exit_text']):
child.del_child(rule['exit_text'])
new_child = child.add_child(
rule['exit_text'],
child._get_child_indent()
)
new_child.order_weight = 999
def _get_child_indent(self):
""" Determines the child indent level and returns it """
if self.children:
return self.children[0].indent_level
else:
return self.indent_level + 1
def to_tag_spec(self, tags):
"""
Returns the configuration as a tag spec definition
This is handy when you have a segment of config and need to
generate a tag spec to tag configuration in another instance
"""
tag_spec = []
for child in self._all_children():
if not child.children:
child_spec = [{'equals': t} for t in child._path()]
tag_spec.append({'section': child_spec, 'add_tags': tags})
return tag_spec
def add_tags(self, tag_rules, strip_negation=False):
"""
Handler for tagging sections of HierarchicalConfiguration data structure
for inclusion and exclusion.
"""
for rule in tag_rules:
for child in self._all_children():
if child._lineage_test(rule, strip_negation):
if 'add_tags' in rule:
child.deep_append_tags(rule['add_tags'])
for ancestor in child.parent._lineage():
ancestor._append_tags(rule['add_tags'])
if 'remove_tags' in rule:
child.deep_remove_tags(rule['remove_tags'])
return self
def deep_append_tags(self, tags):
"""
Append tags to self.tags and recursively for all children
"""
self._append_tags(tags)
for child in self._all_children():
child._append_tags(tags)
def deep_remove_tags(self, tags):
"""
Remove tags from self.tags and recursively for all children
"""
self._remove_tags(tags)
for child in self._all_children():
child._remove_tags(tags)
def _append_tags(self, tags):
"""
Add tags to self.tags
"""
if isinstance(tags, basestring):
tags = [tags]
for tag in tags:
if not tag in self.tags:
self.tags.append(tag)
def _remove_tags(self, tags):
"""
Remove tags from self.tags
"""
if isinstance(tags, basestring):
tags = [tags]
for tag in tags:
if tag in self.tags:
self.tags.remove(tag)
def with_tags(self, tags, new_instance=None):
"""
Returns a new instance containing only sub-objects
with one of the tags in tags
"""
if new_instance is None:
new_instance = HierarchicalConfiguration(options=self.options)
for child in self.children:
if list(set(tags) & set(self.tags)):
new_instance._add_shallow_copy_of(child)
new_child.with_tags(tags, new_child)
return new_instance
def deep_diff_tree_with(self, other, delta=None):
"""
Figures out what commands need to be executed to transition from other to self.
Self is the targat datastructure(i.e. the compiled template), other is the source(i.e. running-config)
"""
if delta is None:
delta = HierarchicalConfiguration(options=self.options)
# find other.children that are not in self.children - i.e. what needs to be negated or defaulted
# Also, find out if another command in other.children will overwrite -
# i.e. be idempotent
for other_child in other.children:
if self._child_exists(other_child.text):
pass
elif other_child._idempotent_command(self.children):
pass
else:
# in other but not self
# add this node but not any children
deleted = delta.add_child(
other_child.text,
other_child.indent_level)
deleted.negate()
if other_child.children:
deleted.comment = "removes {} lines".format(
len(other_child._all_children()) + 1)
# find what would need to be added to other to get to self
for self_child in self.children:
# if the child exist, recurse into its children
if other._child_exists(self_child.text):
other_child = other.get_child('equals', self_child.text)
subtree = delta.add_child(
self_child.text,
self_child.indent_level)
self_child.deep_diff_tree_with(other_child, subtree)
if not subtree.children:
subtree._delete()
# If the line is an ACL, do we need to resequence it?
elif other_child._resequence_acl_check():
self_child._resequence_acl(delta)
# Do we need to rewrite the child and its children as well?
elif other_child._sectional_overwrite_check():
self_child._overwrite_with(other_child, delta, True)
elif other_child._sectional_overwrite_no_negate_check():
self_child._overwrite_with(other_child, delta, False)
# if the child is absent, add it
else:
new_item = delta._add_deep_copy_of(self_child)
# mark the new item and all of its children as new_in_config
for child in new_item._all_children():
child.new_in_config = True
if new_item.children:
new_item.comment = "new section, didn't exist before"
return delta
def from_file(self, file_path):
""" Load configuration text from a file """
with open(file_path, 'r') as f:
config_text = f.read()
self.from_config_text(config_text)
def _add_acl_sequence_numbers(self):
"""
Add ACL sequence numbers for use on configurations with a style of 'ios'
"""
ipv4_acl_sw = ('ip access-list')
#ipv6_acl_sw = ('ipv6 access-list')
acl_line_sw = ('permit', 'deny', 'remark')
for child in self.children:
if child.text.startswith(ipv4_acl_sw):
sn = 10
for sub_child in child.children:
if sub_child.text.startswith(acl_line_sw):
sub_child.text = "{} {}".format(sn, sub_child.text)
sn += 10
# elif child.text.startswith(ipv6_acl_sw):
# sn = 10
# for sub_child in child.children:
# if sub_child.text.startswith(acl_line_sw):
# sub_child.text = "sequence {} {}".format(sn, sub_child.text)
# sn += 10
return self
def from_config_text(self, config_text):
""" Create HierarchicalConfiguration nested objects from text """
for sub in self.options['full_text_sub']:
config_text = re.sub(
sub['search'].decode(
'string_escape'),
sub['replace'].decode(
'string_escape'),
config_text)
current_section = self
current_section.indent_level = -1
most_recent_item = current_section
indent_adjust = 0
end_indent_adjust = []
for line in config_text.splitlines():
line = line.rstrip('\n')
for sub in self.options['per_line_sub']:
line = re.sub(
sub['search'].decode('string_escape'),
sub['replace'].decode('string_escape'),
line)
line = line.rstrip()
# If line is now empty, move to the next
if not line:
continue
# Determine indentation level
this_indent = len(line) - len(line.lstrip()) + indent_adjust
line = line.lstrip()
# Walks back up the tree
while this_indent <= current_section.indent_level:
current_section = current_section.parent
# Walks down the tree by one step
if this_indent > most_recent_item.indent_level:
current_section = most_recent_item
most_recent_item = current_section.add_child(
line,
this_indent,
True)
for expression in self.options['indent_adjust']:
if re.search(expression['start_expression'], line):
indent_adjust += 1
end_indent_adjust.append(expression['end_expression'])
break
if end_indent_adjust and re.search(end_indent_adjust[0], line):
indent_adjust -= 1
del(end_indent_adjust[0])
if self.options['style'] in ['ios']:
self._add_acl_sequence_numbers()
return self
def to_detailed_ouput(self):
""" Returns a list of Cisco style formated lines with tags and comments"""
lines = []
for child in self._all_children_sorted():
cisco_style_text_line = child._cisco_style_text()
lines.append({
'text': cisco_style_text_line,
'tags': child.tags,
'post_exec_sleep': child.post_exec_sleep,
'post_exec_string': child.post_exec_string,
'comment': child.comment
})
return lines
def _swap_negation(self):
""" Swap negation of a self.text """
if self.text.startswith('no '):
self.text = self.text[3:]
else:
self.text = 'no ' + self.text
return self
def _default(self):
""" Default self.text """
if self.text.startswith('no '):
self.text = 'default ' + self.text[3:]
else:
self.text = 'default ' + self.text
return self
def negate(self):
""" Negate self.text """
for rule in self.options['negation_negate_with']:
if self._lineage_test(rule):
self.text = rule['use']
return self
for rule in self.options['negation_default_when']:
if self._lineage_test(rule):
return self._default()
return self._swap_negation()
def _idempotent_acl_check(self):
"""
Handle conditional testing to determine if idempotent acl handling for iosxr should be used
"""
if self.options['style'] in ['iosxr']:
if not self.parent._is_base_instance():
acl = ('ipv4 access-list', 'ipv6 access-list')
if self.parent.text.startswith(acl):
return True
return False
def _idempotent_command(self, other_children):
"""
Determine if self.text is an idempotent change.
"""
# Blacklist commands from matching as idempotent
for rule in self.options['idempotent_commands_blacklist']:
if self._lineage_test(rule, True):
return False
# Handles idempotent acl entry identification
if self._idempotent_acl_check():
if self.options['style'] in ['iosxr']:
self_sn = self.text.split(' ', 1)[0]
for other_child in other_children:
if self.options['style'] in ['iosxr']:
other_sn = other_child.text.split(' ', 1)[0]
if self_sn == other_sn:
return True
# Idempotent command identification
for rule in self.options['idempotent_commands']:
if self._lineage_test(rule, True):
for other_child in other_children:
if other_child._lineage_test(rule, True):
return True
return False