334 lines
10 KiB
Perl
334 lines
10 KiB
Perl
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# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
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package xCAT_plugin::dhcp;
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use xCAT::Table;
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use Data::Dumper;
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use MIME::Base64;
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use Socket;
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use Sys::Syslog;
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use IPC::Open2;
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my @dhcpconf; #Hold DHCP config file contents to be written back.
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my @nrn; # To hold output of netstat -rn to be consulted throughout process
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my $domain;
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my $omshell;
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sub handled_commands {
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return {
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makedhcp => "dhcp",
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}
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}
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sub delnode {
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my $node = shift;
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my $inetn = inet_aton($node);
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print $omshell "new host\n";
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print $omshell "set name = \"$node\"\n"; #Find and destroy conflict name
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print $omshell "open\n";
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print $omshell "remove\n";
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print $omshell "close\n";
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if ($inetn) {
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my $ip = inet_ntoa(inet_aton($node));;
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unless ($ip) { return; }
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print $omshell "new host\n";
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print $omshell "set ip-address = $ip\n"; #find and destroy ip conflict
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print $omshell "open\n";
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print $omshell "remove\n";
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print $omshell "close\n";
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}
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}
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sub addnode {
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#Use omshell to add the node.
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#the process used is blind typing commands that should work
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#it tries to delet any conflicting entries matched by name and
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#hardware address and ip address before creating a brand now one
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#unfortunate side effect: dhcpd.leases can look ugly over time, when
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#doing updates would keep it cleaner, good news, dhcpd restart cleans
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#up the lease file the way we would want anyway.
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my $node = shift;
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my $ent;
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my $mactab = xCAT::Table->new('mac');
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unless ($mactab) { return; } #TODO: report error sanely
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$ent = $mactab->getNodeAttribs($node,[qw(mac interface)]);
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unless ($ent and $ent->{mac}) {
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return; #TODO: sane error
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}
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my $inetn = inet_aton($node);
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unless ($inetn) {
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syslog("local1|err","xCAT DHCP plugin unable to resolve IP for $node");
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return;
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}
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my $ip = inet_ntoa(inet_aton($node));;
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print "Setting $node ($ip) to ".$ent->{mac}."\n";
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print $omshell "new host\n";
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print $omshell "set name = \"$node\"\n"; #Find and destroy conflict name
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print $omshell "open\n";
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print $omshell "remove\n";
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print $omshell "close\n";
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print $omshell "new host\n";
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print $omshell "set ip-address = $ip\n"; #find and destroy ip conflict
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print $omshell "open\n";
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print $omshell "remove\n";
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print $omshell "close\n";
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print $omshell "new host\n";
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print $omshell "set hardware-address = ".$ent->{mac}."\n"; #find and destroy mac conflict
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print $omshell "open\n";
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print $omshell "remove\n";
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print $omshell "close\n";
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print $omshell "new host\n";
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print $omshell "set name = \"$node\"\n";
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print $omshell "set hardware-address = ".$ent->{mac}."\n";
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print $omshell "set hardware-type = 1\n";
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print $omshell "set ip-address = $ip\n";
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print $omshell "create\n";
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unless (grep /#definition for host $node/,@dhcpconf) {
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push @dhcpconf,"#definition for host $node can be found in the dhcpd.leases file\n";
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}
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}
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sub process_request {
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my $req = shift;
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my $callback = shift;
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my $sitetab = xCAT::Table->new('site');
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my %activenics;
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my $querynics=1;
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if ($sitetab) {
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my $href;
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($href) = $sitetab->getAttribs({key=>'dhcpinterfaces'},'value');
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unless ($href and $href->{value}) { #LEGACY: singular keyname for old style site value
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($href) = $sitetab->getAttribs({key=>'dhcpinterface'},'value');
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}
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if ($href and $href->{value}) {
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foreach (split /[,\s]+/,$href->{value}) {
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$activenics{$_} = 1;
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$querynics=0;
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}
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}
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($href) = $sitetab->getAttribs({key=>'domain'},'value');
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unless ($href and $href->{value}) {
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$callback->({error=>["No domain defined in site tabe"],errorcode=>[1]});
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return;
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}
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$domain = $href->{value};
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}
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@dhcpconf = ();
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unless ($req->{arg} or $req->{node}) {
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$callback->({data=>["Usage: makedhcp <-n> <noderange>"]});
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return;
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}
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if (grep /-n/,@{$req->{arg}}) {
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if (-e "/etc/dhcpd.conf") {
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my $bakname = "/etc/dhcpd.conf.xcatbak";
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while (-e $bakname) { #look for unused backup name..
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$bakname .= "~";
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}
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rename("/etc/dhcpd.conf",$bakname);
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}
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} else {
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open($rconf,"/etc/dhcpd.conf"); # Read file into memory
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if ($rconf) {
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while (<$rconf>) {
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push @dhcpconf,$_;
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}
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close($rconf);
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}
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unless ($dhcpconf[0] =~ /^#xCAT/) { #Discard file if not xCAT originated, like 1.x did
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@dhcpconf = ();
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}
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}
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@nrn = split /\n/,`/bin/netstat -rn`;
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splice @nrn,0,2; #get rid of header
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if ($querynics) { #Use netstat to determine activenics only when no site ent.
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foreach (@nrn) {
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my @ent = split /\s+/;
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if ($ent[7] =~ m/(ipoib|ib|vlan|bond|eth|myri|man|wlan)/) { #Mask out many types of interfaces, like xCAT 1.x
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$activenics{$ent[7]} = 1;
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}
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}
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}
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unless ($dhcpconf[0]) { #populate an empty config with some starter data...
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newconfig();
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}
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foreach (keys %activenics) {
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addnic($_);
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}
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if ($req->{node}) {
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my $passtab = xCAT::Table->new('passwd');
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my $ent;
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($ent) = $passtab->getAttribs({key=>"omapi"},qw(username password));
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unless ($ent->{username} and $ent->{password}) { return; } # TODO sane err
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#Have nodes to update
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#open2($omshellout,$omshell,"/usr/bin/omshell");
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open($omshell,"|/usr/bin/omshell > /dev/null");
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print $omshell "key ".$ent->{username}." \"".$ent->{password}."\"\n";
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print $omshell "connect\n";
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foreach(@{$req->{node}}) {
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if (grep /^-d$/,@{$req->{arg}}) {
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delnode $_;
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} else {
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addnode $_;
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}
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}
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close($omshell);
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}
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foreach (@nrn) {
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my @line = split /\s+/;
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if ($activenics{$line[7]}) {
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addnet($line[0],$line[2]);
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}
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}
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writeout();
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}
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sub addnet {
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my $net = shift;
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my $mask = shift;
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my $nic;
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unless (grep /\} # $net\/$mask subnet_end/,@dhcpconf) {
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foreach (@nrn) { # search for relevant NIC
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my @ent = split /\s+/;
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if ($ent[0] eq $net and $ent[2] eq $mask) {
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$nic=$ent[7];
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}
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}
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print "Need to add $net $mask under $nic\n";
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my $idx=0;
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while ($idx <= $#dhcpconf) {
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if ($dhcpconf[$idx] =~ /\} # $nic nic_end\n/) {
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last;
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}
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$idx++;
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}
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unless ($dhcpconf[$idx] =~ /\} # $nic nic_end\n/) {
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return 1; #TODO: this is an error condition
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}
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# if here, means we found the idx before which to insert
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my $nettab = xCAT::Table->new("networks");
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my $nameservers;
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my $gateway;
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my $tftp;
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my $range;
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if ($nettab) {
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my ($ent) = $nettab->getAttribs({net=>$net,mask=>$mask},qw(tftpserver nameservers gateway dynamicrange));
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if ($ent and $ent->{nameservers}) {
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$nameservers = $ent->{nameservers};
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}
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if ($ent and $ent->{tftpserver}) {
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$tftp = $ent->{tftpserver};
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}
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if ($ent and $ent->{gateway}) {
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$gateway = $ent->{gateway};
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}
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if ($ent and $ent->{dynamicrange}) {
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$range = $ent->{dynamicrange};
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$range =~ s/[,-]/ /g;
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}
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}
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my @netent;
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@netent = (
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" subnet $net netmask $mask {\n",
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" max-lease-time 43200;\n",
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" min-lease-time 43200;\n",
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" default-lease-time 43200;\n"
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);
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if ($gateway) {
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push @netent," option routers $gateway;\n";
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}
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if ($tftp) {
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push @netent," next-server $tftp;\n";
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}
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push @netent," option domain-name \"$domain\";\n";
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if ($nameservers) {
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push @netent," option domain-name-servers $nameservers;\n";
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}
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push @netent," if option client-architecture = 00:00 { #x86\n";
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push @netent," filename \"pxelinux.0\";\n";
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push @netent," } else if option client-architecture = 00:02 { #ia64\n ";
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push @netent," filename \"elilo.efi\";\n";
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push @netent," } else if substring(filename,0,1) = null { #otherwise, provide yaboot if the client isn't specific\n ";
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push @netent," filename \"yaboot\";\n";
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push @netent," }\n";
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if ($range) { push @netent," range dynamic-bootp $range;\n" };
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push @netent," } # $net\/$mask subnet_end\n";
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splice(@dhcpconf,$idx,0,@netent);
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}
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}
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sub addnic {
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my $nic = shift;
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my $firstindex=0;
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my $lastindex=0;
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unless (grep /} # $nic nic_end/,@dhcpconf) { #add a section if not there
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print "Adding NIC $nic\n";
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push @dhcpconf,"shared-network $nic {\n";
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push @dhcpconf,"\} # $nic nic_end\n";
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}
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#return; #Don't touch it, it should already be fine..
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#my $idx=0;
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#while ($idx <= $#dhcpconf) {
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# if ($dhcpconf[$idx] =~ /^shared-network $nic {/) {
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# $firstindex = $idx; # found the first place to chop...
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# } elsif ($dhcpconf[$idx] =~ /} # $nic network_end/) {
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# $lastindex=$idx;
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# }
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# $idx++;
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#}
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#print Dumper(\@dhcpconf);
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#if ($firstindex and $lastindex) {
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# splice @dhcpconf,$firstindex,($lastindex-$firstindex+1);
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#}
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#print Dumper(\@dhcpconf);
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}
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sub writeout {
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my $targ;
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open($targ,'>',"/etc/dhcpd.conf");
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foreach (@dhcpconf) {
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print $targ $_;
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}
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close($targ)
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}
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sub newconfig {
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# This function puts a standard header in and enough to make omapi work.
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my $passtab = xCAT::Table->new('passwd',-create=>1);
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push @dhcpconf,"#xCAT generated dhcp configuration\n";
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push @dhcpconf,"\n";
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push @dhcpconf,"authoritative;\n";
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push @dhcpconf,"ddns-update-style none;\n";
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push @dhcpconf,"option client-architecture code 93 = unsigned integer 16;\n";
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push @dhcpconf,"\n";
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push @dhcpconf,"omapi-port 7911;\n"; #Enable omapi...
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push @dhcpconf,"key xcat_key {\n";
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push @dhcpconf," algorithm hmac-md5;\n";
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my $secret = encode_base64(genpassword(32)); #Random from set of 62^32
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chomp $secret;
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$passtab->setAttribs({key=>omapi},{username=>'xcat_key',password=>$secret});
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push @dhcpconf," secret \"".$secret."\";\n";
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push @dhcpconf,"};\n";
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push @dhcpconf,"omapi-key xcat_key;\n";
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}
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sub genpassword {
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#Generate a pseudo-random password of specified length
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my $length = shift;
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my $password='';
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my $characters= 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890';
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srand; #have to reseed, rand is not rand otherwise
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while (length($password) < $length) {
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$password .= substr($characters,int(rand 63),1);
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}
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return $password;
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}
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1;
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