| 1 | # dns/trunk/DNSDB.pm
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| 2 | # Abstraction functions for DNS administration
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| 3 | ###
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| 4 | # SVN revision info
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| 5 | # $Date: 2009-08-31 20:16:27 +0000 (Mon, 31 Aug 2009) $
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| 6 | # SVN revision $Rev: 4 $
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| 7 | # Last update by $Author: kdeugau $
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| 8 | ###
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| 9 | # Copyright (C) 2008 - Kris Deugau <kdeugau@deepnet.cx>
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| 10 |
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| 11 | package DNSDB;
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| 12 |
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| 13 | use strict;
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| 14 | use warnings;
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| 15 | use Exporter;
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| 16 | use DBI;
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| 17 | #use Net::SMTP;
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| 18 | #use NetAddr::IP qw( Compact );
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| 19 | #use POSIX;
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| 20 | use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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| 21 |
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| 22 | $VERSION = 0.1;
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| 23 | @ISA = qw(Exporter);
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| 24 | @EXPORT_OK = qw(
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| 25 | &initGlobals &connectDB &finish &addDomain &delDomain &domainName &getSOA &getRecLine &getDomRecs
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| 26 | &addRec &delRec &domStatus
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| 27 | %typemap %reverse_typemap
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| 28 | );
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| 29 |
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| 30 | @EXPORT = (); # Export nothing by default.
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| 31 | %EXPORT_TAGS = ( ALL => [qw(
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| 32 | &initGlobals &connectDB &finish &addDomain &delDomain &domainName &getSOA &getRecLine &getDomRecs
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| 33 | &addRec &delRec &domStatus
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| 34 | %typemap %reverse_typemap
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| 35 | )]
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| 36 | );
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| 37 |
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| 38 | our $group = 1;
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| 39 | our $errstr = '';
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| 40 |
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| 41 | # Halfway sane defaults for SOA, TTL, etc.
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| 42 | our %def = qw (
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| 43 | contact hostmaster.DOMAIN
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| 44 | prins ns1.myserver.com
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| 45 | soattl 86400
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| 46 | refresh 10800
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| 47 | retry 3600
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| 48 | expire 604800
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| 49 | minttl 10800
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| 50 | ttl 10800
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| 51 | );
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| 52 |
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| 53 | # DNS record type map and reverse map.
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| 54 | # loaded from the database, from http://www.iana.org/assignments/dns-parameters
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| 55 | our %typemap;
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| 56 | our %reverse_typemap;
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| 57 |
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| 58 | ##
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| 59 | ## Initialization and cleanup subs
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| 60 | ##
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| 61 |
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| 62 | ## DNSDB::connectDB()
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| 63 | # Creates connection to DNS database.
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| 64 | # Requires the database name, username, and password.
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| 65 | # Returns a handle to the db.
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| 66 | # Set up for a PostgreSQL db; could be any transactional DBMS with the
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| 67 | # right changes.
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| 68 | sub connectDB {
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| 69 | $errstr = '';
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| 70 | my ($dbname,$user,$pass) = @_;
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| 71 | my $dbh;
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| 72 | my $DSN = "DBI:Pg:dbname=$dbname";
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| 73 |
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| 74 | my $host = shift;
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| 75 | $DSN .= ";host=$host" if $host;
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| 76 |
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| 77 | # Note that we want to autocommit by default, and we will turn it off locally as necessary.
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| 78 | # We may not want to print gobbledygook errors; YMMV. Have to ponder that further.
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| 79 | $dbh = DBI->connect($DSN, $user, $pass, {
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| 80 | AutoCommit => 1,
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| 81 | PrintError => 0
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| 82 | })
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| 83 | or return (undef, $DBI::errstr) if(!$dbh);
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| 84 |
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| 85 | # Return here if we can't select. Note that this indicates a
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| 86 | # problem executing the select.
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| 87 | my $sth = $dbh->prepare("select group_id from groups limit 1");
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| 88 | $sth->execute();
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| 89 | return (undef,$DBI::errstr) if ($sth->err);
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| 90 |
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| 91 | # See if the select returned anything (or null data). This should
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| 92 | # succeed if the select executed, but...
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| 93 | $sth->fetchrow();
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| 94 | return (undef,$DBI::errstr) if ($sth->err);
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| 95 |
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| 96 | $sth->finish;
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| 97 |
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| 98 | # If we get here, we should be OK.
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| 99 | return ($dbh,"DB connection OK");
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| 100 | } # end connectDB
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| 101 |
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| 102 |
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| 103 | ## DNSDB::finish()
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| 104 | # Cleans up after database handles and so on.
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| 105 | # Requires a database handle
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| 106 | sub finish {
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| 107 | my $dbh = $_[0];
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| 108 | $dbh->disconnect;
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| 109 | } # end finish
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| 110 |
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| 111 |
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| 112 | ## DNSDB::initGlobals()
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| 113 | # Initialize global variables
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| 114 | # NB: this does NOT include web-specific session variables!
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| 115 | # Requires a database handle
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| 116 | sub initGlobals {
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| 117 | my $dbh = shift;
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| 118 |
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| 119 | # load system-wide site defaults and things from config file
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| 120 | open SYSDEFAULTS, "</etc/dnsdb.conf";
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| 121 | ##fixme - error check!
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| 122 | while (<SYSDEFAULTS>) {
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| 123 | next if /^\s*#/;
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| 124 | $def{contact} = $1 if /contact ?= ?([a-z0-9_.-]+)/i;
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| 125 | $def{prins} = $1 if /prins ?= ?([a-z0-9_.-]+)/i;
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| 126 | $def{soattl} = $1 if /soattl ?= ?([a-z0-9_.-]+)/i;
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| 127 | $def{refresh} = $1 if /refresh ?= ?([a-z0-9_.-]+)/i;
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| 128 | $def{retry} = $1 if /retry ?= ?([a-z0-9_.-]+)/i;
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| 129 | $def{expire} = $1 if /expire ?= ?([a-z0-9_.-]+)/i;
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| 130 | $def{minttl} = $1 if /minttl ?= ?([a-z0-9_.-]+)/i;
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| 131 | $def{ttl} = $1 if /ttl ?= ?([a-z0-9_.-]+)/i;
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| 132 | ##fixme? load DB user/pass from config file?
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| 133 | }
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| 134 | # load from database
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| 135 | my $sth = $dbh->prepare("select val,name from rectypes");
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| 136 | $sth->execute;
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| 137 | while (my ($recval,$recname) = $sth->fetchrow_array()) {
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| 138 | $typemap{$recval} = $recname;
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| 139 | $reverse_typemap{$recname} = $recval;
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| 140 | }
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| 141 | } # end initGlobals
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| 142 |
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| 143 |
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| 144 | ##
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| 145 | ## Processing subs
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| 146 | ##
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| 147 |
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| 148 | ## DNSDB::addDomain()
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| 149 | # Add a domain
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| 150 | # Takes a database handle, domain name, numeric group, and boolean(ish) state (active/inactive)
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| 151 | # Returns a status code and message
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| 152 | sub addDomain {
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| 153 | $errstr = '';
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| 154 | my $dbh = shift;
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| 155 | return ('FAIL',"Need database handle") if !$dbh;
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| 156 | my $domain = shift;
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| 157 | return ('FAIL',"Need domain") if !defined($domain);
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| 158 | my $group = shift;
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| 159 | return ('FAIL',"Need group") if !defined($group);
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| 160 | my $state = shift;
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| 161 | return ('FAIL',"Need domain status") if !defined($state);
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| 162 |
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| 163 | my $dom_id;
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| 164 |
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| 165 | # Allow transactions, and raise an exception on errors so we can catch it later.
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| 166 | # Use local to make sure these get "reset" properly on exiting this block
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| 167 | local $dbh->{AutoCommit} = 0;
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| 168 | local $dbh->{RaiseError} = 1;
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| 169 |
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| 170 | # Wrap all the SQL in a transaction
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| 171 | eval {
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| 172 | # insert the domain...
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| 173 | my $sth = $dbh->prepare("insert into domains (domain,group_id,status) values (?,?,?)");
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| 174 | $sth->execute($domain,$group,$state);
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| 175 |
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| 176 | # get the ID...
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| 177 | $sth = $dbh->prepare("select domain_id from domains where domain='$domain'");
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| 178 | $sth->execute;
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| 179 | ($dom_id) = $sth->fetchrow_array();
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| 180 |
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| 181 | # ... and now we construct the standard records from the default set. NB: group should be variable.
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| 182 | $sth = $dbh->prepare("select host,type,val,distance,weight,port,ttl from default_records where group_id=$group");
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| 183 | my $sth_in = $dbh->prepare("insert into records (domain_id,host,type,val,distance,weight,port,ttl)".
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| 184 | " values ($dom_id,?,?,?,?,?,?,?)");
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| 185 | $sth->execute;
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| 186 | while (my ($host,$type,$val,$dist,$weight,$port,$ttl) = $sth->fetchrow_array()) {
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| 187 | $host =~ s/DOMAIN/$domain/g;
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| 188 | $sth_in->execute($host,$type,$val,$dist,$weight,$port,$ttl);
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| 189 | }
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| 190 |
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| 191 | # once we get here, we should have suceeded.
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| 192 | $dbh->commit;
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| 193 | }; # end eval
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| 194 |
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| 195 | if ($@) {
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| 196 | my $msg = $@;
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| 197 | eval { $dbh->rollback; };
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| 198 | return ('FAIL',$msg);
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| 199 | } else {
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| 200 | return ('OK',$dom_id);
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| 201 | }
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| 202 | } # end addDomain
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| 203 |
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| 204 |
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| 205 | ## DNSDB::delDomain()
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| 206 | # Delete a domain.
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| 207 | # for now, just delete the records, then the domain.
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| 208 | # later we may want to archive it in some way instead (status code 2, for example?)
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| 209 | sub delDomain {
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| 210 | my $dbh = shift;
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| 211 | my $domain = shift;
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| 212 |
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| 213 | # Allow transactions, and raise an exception on errors so we can catch it later.
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| 214 | # Use local to make sure these get "reset" properly on exiting this block
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| 215 | local $dbh->{AutoCommit} = 0;
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| 216 | local $dbh->{RaiseError} = 1;
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| 217 |
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| 218 | # Wrap all the SQL in a transaction
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| 219 | eval {
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| 220 | # brute force.
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| 221 | my $sth = $dbh->prepare("select domain_id from domains where domain=?");
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| 222 | $sth->execute($domain);
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| 223 | die "Domain not found, can't delete\n" if $sth->rows < 1;
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| 224 | my ($id) = $sth->fetchrow_array;
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| 225 |
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| 226 | $sth = $dbh->prepare("delete from records where domain_id=$id");
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| 227 | $sth->execute;
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| 228 | $sth = $dbh->prepare("delete from domains where domain=?");
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| 229 | $sth->execute($domain);
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| 230 |
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| 231 | # once we get here, we should have suceeded.
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| 232 | $dbh->commit;
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| 233 | }; # end eval
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| 234 |
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| 235 | if ($@) {
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| 236 | my $msg = $@;
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| 237 | eval { $dbh->rollback; };
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| 238 | return ('FAIL',$msg);
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| 239 | } else {
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| 240 | return ('OK','OK');
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| 241 | }
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| 242 |
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| 243 | } # end delDomain()
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| 244 |
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| 245 |
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| 246 | ## DNSDB::domainName()
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| 247 | # Return the domain name based on a domain ID
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| 248 | # Takes a database handle and the domain ID
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| 249 | # Returns the domain name or undef on failure
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| 250 | sub domainName {
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| 251 | $errstr = '';
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| 252 | my $dbh = shift;
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| 253 | my $domid = shift;
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| 254 | my $sth = $dbh->prepare("select domain from domains where domain_id=?");
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| 255 | $sth->execute($domid);
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| 256 | my ($domname) = $sth->fetchrow_array();
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| 257 | $errstr = $DBI::errstr if !$domname;
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| 258 | return $domname if $domname;
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| 259 | } # end domainName
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| 260 |
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| 261 |
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| 262 | ## DNSDB::editRecord()
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| 263 | # Change an existing record
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| 264 | # Takes a database handle, default/live flag, record ID, and new data and updates the data fields for it
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| 265 | sub editRecord {
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| 266 | $errstr = '';
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| 267 | my $dbh = shift;
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| 268 | my $defflag = shift;
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| 269 | my $recid = shift;
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| 270 | my $host = shift;
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| 271 | my $address = shift;
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| 272 | my $distance = shift;
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| 273 | my $weight = shift;
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| 274 | my $port = shift;
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| 275 | my $ttl = shift;
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| 276 | }
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| 277 |
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| 278 |
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| 279 | ## DNSDB::getSOA()
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| 280 | # Return all suitable fields from an SOA record in separate elements of a hash
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| 281 | # Takes a database handle, default/live flag, and group (default) or domain (live) ID
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| 282 | sub getSOA {
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| 283 | $errstr = '';
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| 284 | my $dbh = shift;
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| 285 | my $def = shift;
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| 286 | my $id = shift;
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| 287 | my %ret;
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| 288 |
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| 289 | my $sql = "select record_id,host,val,ttl from";
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| 290 | if ($def eq 'def' or $def eq 'y') {
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| 291 | $sql .= " default_records where group_id=$id and type=$reverse_typemap{SOA}";
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| 292 | } else {
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| 293 | # we're editing a live SOA record; find based on domain
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| 294 | $sql .= " records where domain_id=$id and type=$reverse_typemap{SOA}";
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| 295 | }
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| 296 | #print "getSOA DEBUG: $sql<br>\n";
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| 297 | my $sth = $dbh->prepare($sql);
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| 298 | $sth->execute;
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| 299 |
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| 300 | my ($recid,$host,$val,$ttl) = $sth->fetchrow_array();
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| 301 | my ($prins,$contact) = split /:/, $host;
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| 302 | my ($refresh,$retry,$expire,$minttl) = split /:/, $val;
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| 303 |
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| 304 | $ret{recid} = $recid;
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| 305 | $ret{ttl} = $ttl;
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| 306 | $ret{prins} = $prins;
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| 307 | $ret{contact} = $contact;
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| 308 | $ret{refresh} = $refresh;
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| 309 | $ret{retry} = $retry;
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| 310 | $ret{expire} = $expire;
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| 311 | $ret{minttl} = $minttl;
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| 312 |
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| 313 | return %ret;
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| 314 | } # end getSOA()
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| 315 |
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| 316 |
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| 317 | ## DNSDB::getRecLine()
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| 318 | # Return all data fields for a zone record in separate elements of a hash
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| 319 | # Takes a database handle, default/live flag, and record ID
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| 320 | sub getRecLine {
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| 321 | $errstr = '';
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| 322 | my $dbh = shift;
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| 323 | my $def = shift;
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| 324 | my $id = shift;
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| 325 |
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| 326 | my $sql = "select record_id,host,type,val,distance,weight,port,ttl from ".
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| 327 | (($def eq 'def' or $def eq 'y') ? 'default_' : '').
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| 328 | "records where record_id=$id";
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| 329 | print "MDEBUG: $sql<br>\n";
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| 330 | my $sth = $dbh->prepare($sql);
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| 331 | $sth->execute;
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| 332 |
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| 333 | my ($recid,$host,$rtype,$val,$distance,$weight,$port,$ttl) = $sth->fetchrow_array();
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| 334 |
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| 335 | if ($sth->err) {
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| 336 | $errstr = $DBI::errstr;
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| 337 | return undef;
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| 338 | }
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| 339 | my %ret;
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| 340 | $ret{recid} = $recid;
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| 341 | $ret{host} = $host;
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| 342 | $ret{type} = $rtype;
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| 343 | $ret{val} = $val;
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| 344 | $ret{distance}= $distance;
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| 345 | $ret{weight} = $weight;
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| 346 | $ret{port} = $port;
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| 347 | $ret{ttl} = $ttl;
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| 348 |
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| 349 | return %ret;
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| 350 | }
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| 351 |
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| 352 |
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| 353 | ##fixme: should use above (getRecLine()) to get lines for below?
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| 354 | ## DNSDB::getDomRecs()
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| 355 | # Return records for a domain
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| 356 | # Takes a database handle, default/live flag, group/domain ID, start,
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| 357 | # number of records, sort field, and sort order
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| 358 | # Returns a reference to an array of hashes
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| 359 | sub getDomRecs {
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| 360 | $errstr = '';
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| 361 | my $dbh = shift;
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| 362 | my $type = shift;
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| 363 | my $id = shift;
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| 364 | my $nrecs = shift || 'all';
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| 365 | my $nstart = shift || 0;
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| 366 |
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| 367 | ## for order, need to map input to column names
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| 368 | my $order = shift || 'host';
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| 369 |
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| 370 | my $sql = "select record_id,host,type,val,distance,weight,port,ttl from";
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| 371 | if ($type eq 'def' or $type eq 'y') {
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| 372 | $sql .= " default_records where group_id=$id";
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| 373 | } else {
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| 374 | $sql .= " records where domain_id=$id";
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| 375 | }
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| 376 | $sql .= " and not type=$reverse_typemap{SOA} order by $order";
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| 377 | $sql .= " limit $nrecs offset $nstart" if $nstart ne 'all';
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| 378 |
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| 379 | my $sth = $dbh->prepare($sql);
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| 380 | $sth->execute;
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| 381 |
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| 382 | my @retbase;
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| 383 | while (my $ref = $sth->fetchrow_hashref()) {
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| 384 | push @retbase, $ref;
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| 385 | }
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| 386 |
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| 387 | my $ret = \@retbase;
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| 388 | return $ret;
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| 389 | } # end getDomRecs()
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| 390 |
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| 391 |
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| 392 | ## DNSDB::addRec()
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| 393 | # Add a new record to a domain or a group's default records
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| 394 | # Takes a database handle, default/live flag, group/domain ID,
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| 395 | # host, type, value, and TTL
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| 396 | # Some types require additional detail: "distance" for MX and SRV,
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| 397 | # and weight/port for SRV
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| 398 | # Returns a status code and detail message in case of error
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| 399 | sub addRec {
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| 400 | $errstr = '';
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| 401 | my $dbh = shift;
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| 402 | my $defrec = shift;
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| 403 | my $id = shift;
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| 404 |
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| 405 | my $host = shift;
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| 406 | my $rectype = shift;
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| 407 | my $val = shift;
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| 408 | my $ttl = shift;
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| 409 |
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| 410 | my $fields = ($defrec eq 'y' ? 'group_id' : 'domain_id').",host,type,val,ttl";
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| 411 | my $vallist = "$id,'$host',$rectype,'$val',$ttl";
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| 412 |
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| 413 | my $dist;
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| 414 | if ($rectype == $reverse_typemap{MX} or $rectype == $reverse_typemap{SRV}) {
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| 415 | $dist = shift;
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| 416 | return ('FAIL',"Need distance for $typemap{$rectype} record") if !defined($dist);
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| 417 | $fields .= ",distance";
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| 418 | $vallist .= ",$dist";
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| 419 | }
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| 420 | my $weight;
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| 421 | my $port;
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| 422 | if ($rectype == $reverse_typemap{SRV}) {
|
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| 423 | $weight = shift;
|
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| 424 | $port = shift;
|
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| 425 | return ('FAIL',"Need weight and port for SRV record") if !defined($weight) or !defined($port);
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| 426 | $fields .= ",weight,port";
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| 427 | $vallist .= ",$weight,$port";
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| 428 | }
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| 429 |
|
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| 430 | my $sql = "insert into ".($defrec eq 'y' ? 'default_' : '')."records ($fields) values ($vallist)";
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| 431 | # something is bugging me about this...
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| 432 | print "DEBUG: $sql<br>\n";
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| 433 | my $sth = $dbh->prepare($sql);
|
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| 434 | $sth->execute;
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| 435 |
|
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| 436 | return ('FAIL',$sth->errstr) if $sth->err;
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| 437 |
|
|---|
| 438 | return ('OK','OK');
|
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| 439 | } # end addRec()
|
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| 440 |
|
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| 441 |
|
|---|
| 442 | ## DNSDB::delRec()
|
|---|
| 443 | # Delete a record.
|
|---|
| 444 | sub delRec {
|
|---|
| 445 | $errstr = '';
|
|---|
| 446 | my $dbh = shift;
|
|---|
| 447 | my $defrec = shift;
|
|---|
| 448 | my $id = shift;
|
|---|
| 449 |
|
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| 450 | my $sth = $dbh->prepare("delete from ".($defrec eq 'y' ? 'default_' : '')."records where record_id=?");
|
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| 451 | $sth->execute($id);
|
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| 452 |
|
|---|
| 453 | return ('FAIL',$sth->errstr) if $sth->err;
|
|---|
| 454 |
|
|---|
| 455 | return ('OK','OK');
|
|---|
| 456 | } # end delRec()
|
|---|
| 457 |
|
|---|
| 458 |
|
|---|
| 459 | ## DNSDB::domStatus()
|
|---|
| 460 | # Sets and/or returns a domain's status
|
|---|
| 461 | # Takes a database handle, domain ID and optionally a status argument
|
|---|
| 462 | # Returns undef on errors.
|
|---|
| 463 | sub domStatus {
|
|---|
| 464 | my $dbh = shift;
|
|---|
| 465 | my $id = shift;
|
|---|
| 466 | my $newstatus = shift;
|
|---|
| 467 |
|
|---|
| 468 | return undef if $id !~ /^\d+$/;
|
|---|
| 469 |
|
|---|
| 470 | my $sth;
|
|---|
| 471 |
|
|---|
| 472 | # ooo, fun! let's see what we were passed for status
|
|---|
| 473 | if ($newstatus) {
|
|---|
| 474 | $sth = $dbh->prepare("update domains set status=? where domain_id=?");
|
|---|
| 475 | # ass-u-me caller knows what's going on in full
|
|---|
| 476 | if ($newstatus =~ /^[01]$/) { # only two valid for now.
|
|---|
| 477 | $sth->execute($newstatus,$id);
|
|---|
| 478 | } elsif ($newstatus =~ /^domo(?:n|ff)$/) {
|
|---|
| 479 | $sth->execute(($newstatus eq 'domon' ? 1 : 0),$id);
|
|---|
| 480 | }
|
|---|
| 481 | }
|
|---|
| 482 |
|
|---|
| 483 | $sth = $dbh->prepare("select status from domains where domain_id=?");
|
|---|
| 484 | $sth->execute($id);
|
|---|
| 485 | my ($status) = $sth->fetchrow_array;
|
|---|
| 486 | return $status;
|
|---|
| 487 | } # end domStatus()
|
|---|
| 488 |
|
|---|
| 489 |
|
|---|
| 490 | # shut Perl up
|
|---|
| 491 | 1;
|
|---|
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