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zonediff.py
#!/usr/bin/env python # # Small library and commandline tool to do logical diffs of zonefiles # ./zonediff -h gives you help output # # Requires dnspython to do all the heavy lifting # # (c)2009 Dennis Kaarsemaker <dennis@kaarsemaker.net> # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """See diff_zones.__doc__ for more information""" from __future__ import print_function __all__ = ['diff_zones', 'format_changes_plain', 'format_changes_html'] try: import dns.zone except ImportError: raise SystemExit("Please install dnspython") def diff_zones(zone1, zone2, ignore_ttl=False, ignore_soa=False): """diff_zones(zone1, zone2, ignore_ttl=False, ignore_soa=False) -> changes Compares two dns.zone.Zone objects and returns a list of all changes in the format (name, oldnode, newnode). If ignore_ttl is true, a node will not be added to this list if the only change is its TTL. If ignore_soa is true, a node will not be added to this list if the only changes is a change in a SOA Rdata set. The returned nodes do include all Rdata sets, including unchanged ones. """ changes = [] for name in zone1: name = str(name) n1 = zone1.get_node(name) n2 = zone2.get_node(name) if not n2: changes.append((str(name), n1, n2)) elif _nodes_differ(n1, n2, ignore_ttl, ignore_soa): changes.append((str(name), n1, n2)) for name in zone2: n1 = zone1.get_node(name) if not n1: n2 = zone2.get_node(name) changes.append((str(name), n1, n2)) return changes def _nodes_differ(n1, n2, ignore_ttl, ignore_soa): if ignore_soa or not ignore_ttl: # Compare datasets directly for r in n1.rdatasets: if ignore_soa and r.rdtype == dns.rdatatype.SOA: continue if r not in n2.rdatasets: return True if not ignore_ttl: return r.ttl != n2.find_rdataset(r.rdclass, r.rdtype).ttl for r in n2.rdatasets: if ignore_soa and r.rdtype == dns.rdatatype.SOA: continue if r not in n1.rdatasets: return True else: return n1 != n2 def format_changes_plain(oldf, newf, changes, ignore_ttl=False): """format_changes(oldfile, newfile, changes, ignore_ttl=False) -> str Given 2 filenames and a list of changes from diff_zones, produce diff-like output. If ignore_ttl is True, TTL-only changes are not displayed""" ret = "--- %s\n+++ %s\n" % (oldf, newf) for name, old, new in changes: ret += "@ %s\n" % name if not old: for r in new.rdatasets: ret += "+ %s\n" % str(r).replace('\n', '\n+ ') elif not new: for r in old.rdatasets: ret += "- %s\n" % str(r).replace('\n', '\n+ ') else: for r in old.rdatasets: if r not in new.rdatasets or ( r.ttl != new.find_rdataset(r.rdclass, r.rdtype).ttl and not ignore_ttl ): ret += "- %s\n" % str(r).replace('\n', '\n+ ') for r in new.rdatasets: if r not in old.rdatasets or ( r.ttl != old.find_rdataset(r.rdclass, r.rdtype).ttl and not ignore_ttl ): ret += "+ %s\n" % str(r).replace('\n', '\n+ ') return ret def format_changes_html(oldf, newf, changes, ignore_ttl=False): """format_changes(oldfile, newfile, changes, ignore_ttl=False) -> str Given 2 filenames and a list of changes from diff_zones, produce nice html output. If ignore_ttl is True, TTL-only changes are not displayed""" ret = '''<table class="zonediff"> <thead> <tr> <th> </th> <th class="old">%s</th> <th class="new">%s</th> </tr> </thead> <tbody>\n''' % (oldf, newf) for name, old, new in changes: ret += ' <tr class="rdata">\n <td class="rdname">%s</td>\n' % name if not old: for r in new.rdatasets: ret += ( ' <td class="old"> </td>\n' ' <td class="new">%s</td>\n' ) % str(r).replace('\n', '<br />') elif not new: for r in old.rdatasets: ret += ( ' <td class="old">%s</td>\n' ' <td class="new"> </td>\n' ) % str(r).replace('\n', '<br />') else: ret += ' <td class="old">' for r in old.rdatasets: if r not in new.rdatasets or ( r.ttl != new.find_rdataset(r.rdclass, r.rdtype).ttl and not ignore_ttl ): ret += str(r).replace('\n', '<br />') ret += '</td>\n' ret += ' <td class="new">' for r in new.rdatasets: if r not in old.rdatasets or ( r.ttl != old.find_rdataset(r.rdclass, r.rdtype).ttl and not ignore_ttl ): ret += str(r).replace('\n', '<br />') ret += '</td>\n' ret += ' </tr>\n' return ret + ' </tbody>\n</table>' # Make this module usable as a script too. def main(): import argparse import subprocess import sys import traceback usage = """%prog zonefile1 zonefile2 - Show differences between zones in a diff-like format %prog [--git|--bzr|--rcs] zonefile rev1 [rev2] - Show differences between two revisions of a zonefile The differences shown will be logical differences, not textual differences. """ p = argparse.ArgumentParser(usage=usage) p.add_argument('-s', '--ignore-soa', action="store_true", default=False, dest="ignore_soa", help="Ignore SOA-only changes to records") p.add_argument('-t', '--ignore-ttl', action="store_true", default=False, dest="ignore_ttl", help="Ignore TTL-only changes to Rdata") p.add_argument('-T', '--traceback', action="store_true", default=False, dest="tracebacks", help="Show python tracebacks when errors occur") p.add_argument('-H', '--html', action="store_true", default=False, dest="html", help="Print HTML output") p.add_argument('-g', '--git', action="store_true", default=False, dest="use_git", help="Use git revisions instead of real files") p.add_argument('-b', '--bzr', action="store_true", default=False, dest="use_bzr", help="Use bzr revisions instead of real files") p.add_argument('-r', '--rcs', action="store_true", default=False, dest="use_rcs", help="Use rcs revisions instead of real files") opts, args = p.parse_args() opts.use_vc = opts.use_git or opts.use_bzr or opts.use_rcs def _open(what, err): if isinstance(what, list): # Must be a list, open subprocess try: proc = subprocess.Popen(what, stdout=subprocess.PIPE) proc.wait() if proc.returncode == 0: return proc.stdout sys.stderr.write(err + "\n") except Exception: sys.stderr.write(err + "\n") if opts.tracebacks: traceback.print_exc() else: # Open as normal file try: return open(what, 'rb') except IOError: sys.stderr.write(err + "\n") if opts.tracebacks: traceback.print_exc() if not opts.use_vc and len(args) != 2: p.print_help() sys.exit(64) if opts.use_vc and len(args) not in (2, 3): p.print_help() sys.exit(64) # Open file descriptors if not opts.use_vc: oldn, newn = args else: if len(args) == 3: filename, oldr, newr = args oldn = "%s:%s" % (oldr, filename) newn = "%s:%s" % (newr, filename) else: filename, oldr = args newr = None oldn = "%s:%s" % (oldr, filename) newn = filename old, new = None, None oldz, newz = None, None if opts.use_bzr: old = _open(["bzr", "cat", "-r" + oldr, filename], "Unable to retrieve revision %s of %s" % (oldr, filename)) if newr != None: new = _open(["bzr", "cat", "-r" + newr, filename], "Unable to retrieve revision %s of %s" % (newr, filename)) elif opts.use_git: old = _open(["git", "show", oldn], "Unable to retrieve revision %s of %s" % (oldr, filename)) if newr != None: new = _open(["git", "show", newn], "Unable to retrieve revision %s of %s" % (newr, filename)) elif opts.use_rcs: old = _open(["co", "-q", "-p", "-r" + oldr, filename], "Unable to retrieve revision %s of %s" % (oldr, filename)) if newr != None: new = _open(["co", "-q", "-p", "-r" + newr, filename], "Unable to retrieve revision %s of %s" % (newr, filename)) if not opts.use_vc: old = _open(oldn, "Unable to open %s" % oldn) if not opts.use_vc or newr is None: new = _open(newn, "Unable to open %s" % newn) if not old or not new: sys.exit(65) # Parse the zones try: oldz = dns.zone.from_file(old, origin='.', check_origin=False) except dns.exception.DNSException: sys.stderr.write("Incorrect zonefile: %s\n", old) if opts.tracebacks: traceback.print_exc() try: newz = dns.zone.from_file(new, origin='.', check_origin=False) except dns.exception.DNSException: sys.stderr.write("Incorrect zonefile: %s\n" % new) if opts.tracebacks: traceback.print_exc() if not oldz or not newz: sys.exit(65) changes = diff_zones(oldz, newz, opts.ignore_ttl, opts.ignore_soa) changes.sort() if not changes: sys.exit(0) if opts.html: print(format_changes_html(oldn, newn, changes, opts.ignore_ttl)) else: print(format_changes_plain(oldn, newn, changes, opts.ignore_ttl)) sys.exit(1) if __name__ == '__main__': main()
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