dhcpd_makeconf.in 15.5 KB
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#!/usr/bin/perl -wT
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#
# EMULAB-COPYRIGHT
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# Copyright (c) 2000-2012 University of Utah and the Flux Group.
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# All rights reserved.
#
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use English;
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use Getopt::Std;
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use Fcntl ':flock';
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#
# dhcpd_makeconf - helper script to create dhcpd.conf files from the database.
# The template file should look like an ordinary dhcpd.conf file, but have
# the string %%nodetype=<type> where you want entries for a set of nodes
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# filled out. See the template file in the dhcp directory for an example.
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#
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sub usage {
    print "Usage: $0 [-h] [-v] [-i] [-t <templatefile>]\n";
    print "-h	Show this message\n";
    print "-v	Use virtual names, when possible, for hostnames\n";
    print "-i 	Install new config file to standard location.\n";
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    print "-r 	Restart DHCPD after config file regeneration (with -i only)\n";
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    print "Without -i, spits out a dhcpd config file on stdout, as in:\n";
    print "  $0 > dhcpd.conf\n";
    exit(1);
}
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my $optlist = "ihvt:r";
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my $install = 0;
my $vnames  = 0;
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my $restart = 0;
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#
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# Configure variables
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#
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my $TBOPS       = "@TBOPSEMAIL@";
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my $ELABINELAB  = @ELABINELAB@;
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# un-taint path
$ENV{'PATH'} = '/bin:/usr/bin:/usr/sbin:/usr/local/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

# Turn off line buffering on output
$| = 1;

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use lib "@prefix@/lib";
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use libdb;
use libtestbed;
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use Node;
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#
# PXE boot constants
#
my $PXEBOOTDIR	    = "/tftpboot";
my $PXELINUXPREFIX  = "$PXEBOOTDIR/pxelinux";
my $PXELINUXBOOT    = "pxelinux.0";
my $PXELINUXCONFIG  = "pxelinux.cfg";

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# XXX hack for now to support gpxelinux as well
my $GPXELINUXPREFIX = "$PXEBOOTDIR/gpxelinux";
my $GPXELINUXBOOT   = "gpxelinux.0";

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my $CRTLTAG	    = TBDB_IFACEROLE_CONTROL();
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my $MNGMNTTAG	    = TBDB_IFACEROLE_MANAGEMENT();
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my $DHCPD_CONF	    = "/usr/local/etc/dhcpd.conf";
my $DHCPD_TEMPLATE  = "/usr/local/etc/dhcpd.conf.template";
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my $DHCPD_TAIL      = "/usr/local/etc/dhcpd.conf.tail";
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my %servernodes	    = ();
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my %dhcp_subbosses  = ();
my %tftp_subbosses  = ();
my %bootinfo_subbosses  = ();
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my %singlectlnet    = ();
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my $template        = $DHCPD_TEMPLATE;
my $outfile	    = "/tmp/dhcpd_makeconf.$$";
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my $OUT		    = *STDOUT;
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my %subboss_dhcp_servers;

sub RestartSubbossDhcp($$);
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sub SetupPXEBoot($$$$);
sub ClearPXEBoot($$);
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#
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# Parse command arguments. Once we return from getopts, all that should
# left are the required arguments.
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#
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%options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (defined($options{"i"})) {
    $install = 1;
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    # We don't want to run this script unless its the real version.
    if ($EUID != 0) {
	die("*** $0:\n".
	    "    Must be root! Maybe its a development version?\n");
    }
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    if (defined($options{"r"})) {
	$restart = 1;
    }
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}
if (defined($options{"h"})) {
    usage();
}
if (defined($options{"v"})) {
    $vnames = 1;
}
if (defined($options{"t"})) {
    $template = $options{"t"};

    #
    # Untaint argument; Allow slash.
    #
    if ($template =~ /^([-\w\.\/]+)$/) {
	$template = $1;
    }
    else {
	die("Tainted template name: $template\n");
    }
}
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#
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# If we are going to actually install this file, must serialize to
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# avoid a trashed config file.
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#
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if ($install) {
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    if ((my $locked = TBScriptLock("dhcpd.conf", 1)) != TBSCRIPTLOCK_OKAY()) {
	exit(0)
	    if ($locked == TBSCRIPTLOCK_IGNORE);
	fatal("Could not get the lock after a long time!\n");
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    }
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    #
    # Open temporary output file.
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    #
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    open(OF, ">$outfile") or
	fatal("Could not open $outfile\n");
    $OUT = *OF;
}
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#
# Locate all the "alternate server" nodes (inner elab boss nodes or
# inner plab PLC nodes).  We do this now rather than in the per-nodetype
# query below because the server may not be of the same type as the nodes
# they serve!
#
my $query_result =
    DBQueryWarn("select r.node_id,i.IP,r.pid,r.eid ".
		"from reserved as r ".
                "left join interfaces as i on ".
                "     r.node_id=i.node_id ".
                "where (r.inner_elab_role='boss' or ".
		"       r.inner_elab_role='boss+router' or ".
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		"       r.inner_elab_role='boss+fs+router' or ".
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		"       r.plab_role='plc') and ".
		"      i.role='$CRTLTAG' ");
if (! $query_result) {
    fatal("Could not dhcpd data from DB!");
}
while (my %row = $query_result->fetchhash()) {
    if (defined($row{"pid"}) && defined($row{"eid"})) {
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	my $pid = $row{"pid"};
	my $eid = $row{"eid"};
	my $tag = "${pid}:${eid}";
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	$servernodes{$tag} = $row{"IP"};
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	#
	# Need to know if this is a single or dual control network model.
	#
	my $exp_result =
	    DBQueryFatal("select elabinelab_singlenet from experiments ".
			 "where pid='$pid' and eid='$eid'");
	if ($exp_result->num_rows) {
	    $singlectlnet{$tag} = ($exp_result->fetchrow_array())[0];
	}
	else {
	    $singlectlnet{$tag} = 0;
	}
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    }
}

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# Slurp in all of the subboss data to know A) if we should serve the DHCP
# lease to a given node, or if the next-server field should be something
# other than the IP for boss.
$query_result =
    DBQueryWarn("select s.node_id, s.service, s.subboss_id, i.IP ".
		"from subbosses as s left join interfaces as i on ".
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		"s.subboss_id=i.node_id where i.role='$CRTLTAG' and s.disabled=0");
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if (! $query_result) {
    fatal("Could not dhcpd data from DB!");
}
while (my %row = $query_result->fetchhash()) {
    my $node_id = $row{"node_id"};

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    # We need to try restarting dhcpd on *all* subbosses, just in case
    # we've moved all dhcp nodes from one subboss to another.
    # Otherwise the old server wouldn't get restarted and both the old
    # and new servers would attempt to respond to dhcp requests.

    $subboss_dhcp_servers{$row{"subboss_id"}} = 1;

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    if ($row{"service"} eq 'tftp') {
	    $tftp_subbosses{$node_id} = $row{"IP"};
    } elsif ($row{"service"} eq 'dhcp') {
	    $dhcp_subbosses{$node_id} = $row{"IP"};
    } elsif ($row{"service"} eq 'bootinfo') {
	    $bootinfo_subbosses{$node_id} = $row{"IP"};
    }
}

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open(IF,"<$template") or
    fatal("Unable to open $template for reading");
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while (<IF>) {
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	if (/^(\s*)range\s*;/) {
		# Comment out a null DHCPD_DYNRANGE line.
		my $spaces = $1;
		print $OUT "${spaces}#range ... ...;\n";
	} elsif (/^(\s*)\%\%nodetype=(\w+)/) {
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		my $spaces = $1;
		my $nodetype = $2;
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		$query_result =
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		    DBQueryWarn("select n.node_id,n.type, ".
				"       n.pxe_boot_path,n.next_pxe_boot_path,".
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				"       i.IP,i.MAC,r.pid,r.eid,r.vname, ".
				"       r.inner_elab_role,r.inner_elab_boot, ".
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				"       r.plab_role,r.plab_boot,i.role ".
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				"from nodes as n ".
				"left join interfaces as i on ".
				"     n.node_id=i.node_id ".
				"left join node_types as t on n.type=t.type ".
				"left join reserved as r on ".
				"     n.node_id=r.node_id ".
				"where (n.type='$nodetype' or ".
				"       t.class='$nodetype') and ".
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				"      (i.role='$CRTLTAG' or ".
				"       (i.role='$MNGMNTTAG' and ".
				"        t.isremotenode=0)) ".
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				"order BY n.priority");
		if (! $query_result) {
		    fatal("Could not dhcpd data from DB!");
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		}
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		while (my %row = $query_result->fetchhash()) {
		    my $ip  = $row{"IP"};
		    my $mac = $row{"MAC"};
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		    my $role = $row{"role"};
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		    my $node_id;
		    my $next_server = "";
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		    my $bootinfo_server = "";
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		    my $hostname = "";
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		    my $dns = "";
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		    my $booting = "";
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		    my $filename = "";
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		    if ($vnames && defined($row{"vname"})) {
			$node_id = $row{"vname"};
		    }
		    else {
			$node_id = $row{"node_id"};
		    }
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		    # Management ports, nothing special to do.
		    if ($role eq TBDB_IFACEROLE_MANAGEMENT()) {
			$hostname =
			    "${spaces}\toption host-name \"${node_id}-mng\";\n";
			goto spit;
		    }
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		    my $tag;
		    if (defined($row{"pid"})) {
			$tag = $row{"pid"} . ":" . $row{"eid"};
		    }

		    if (defined($tag) && defined($servernodes{$tag}) &&
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			(($row{"inner_elab_boot"} == 1 &&
			  defined($row{"inner_elab_role"}) &&
			  $row{"inner_elab_role"} eq "node") ||
			 ($row{"plab_boot"} == 1 &&
			  defined($row{"plab_role"}) &&
			  $row{"plab_role"} eq "node"))) {
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			#
			# XXX it is not yet completely clear what all we
			# need to do, or not do, for plab nodes.
			#
			if ($row{"plab_boot"} == 1) {
			    $hostname =
				"${spaces}\toption host-name \"$node_id\";\n";
			    $next_server = "${spaces}\tnext-server " .
				$servernodes{$tag} . ";\n";
			} else {
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			    if ($singlectlnet{$tag}) {
				$hostname = "${spaces}\toption host-name ".
				    "\"$node_id\";\n";
				$booting  = "${spaces}\tignore booting;\n";
			    }
			    else {
				$next_server = "${spaces}\tnext-server " .
				    $servernodes{$tag} . ";\n";
				$dns = "${spaces}\toption ".
				    "domain-name-servers 1.1.1.1;\n";
			    }
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			}
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		    }
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		    elsif (defined $dhcp_subbosses{$node_id}) {
			$hostname =
			    "${spaces}\toption host-name \"$node_id\";\n";
	                $booting = "${spaces}\tignore booting;\n";
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		        if (defined $tftp_subbosses{$node_id}) {
			    $next_server = "${spaces}\tnext-server " .
			        $tftp_subbosses{$node_id} . ";\n";
		        }
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		    }
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		    else {
			$hostname =
			    "${spaces}\toption host-name \"$node_id\";\n";
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		        if (defined $tftp_subbosses{$node_id}) {
			    $next_server = "${spaces}\tnext-server " .
			        $tftp_subbosses{$node_id} . ";\n";
		        }
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		        if (defined $bootinfo_subbosses{$node_id}) {
			    $bootinfo_server = "${spaces}\toption PXE.emulab-bootinfo " .
			        $bootinfo_subbosses{$node_id} . ";\n";
		        }
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		    }
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		    #
		    # Handle alternate boot program filename if it exists.
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		    # Order is:
		    #
		    # 1. nodes.next_pxe_boot_path for node
		    # 2. nodes.pxe_boot_path for node
		    # 3. "pxe_boot_path" node_attribute for node
		    # 4. "pxe_boot_path" node_type_attribute for node type
		    # 5. don't set (i.e., use the dhcpd.conf global default).
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		    #
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		    my $pxeboot = $row{"next_pxe_boot_path"};
		    if (!$pxeboot) {
			$pxeboot = $row{"pxe_boot_path"};
		    }
		    $filename = SetupPXEBoot($node_id, $mac, 1, $pxeboot);
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		    if (!$filename) {
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			# Get the node or node type default
			my $nobj = Node->Lookup($node_id);
			if (!$nobj) {
			    fatal("Could not find Node info for $node_id");
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			}
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			my $path = $nobj->default_pxeboot();
			$filename = SetupPXEBoot($node_id, $mac, 0, $path);
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		    }
		    if ($filename) {
			$filename = "${spaces}\tfilename \"$filename\";\n";
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		    }
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		  spit:
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		    # Need to make MAC look right..
		    $mac =~ s/(..)\B/$1:/g;

		    print $OUT "${spaces}host $ip {\n";
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		    print $OUT $filename
			if (defined($filename));
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		    print $OUT $next_server;
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		    print $OUT $bootinfo_server;
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		    print $OUT $dns;
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		    print $OUT $booting;
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		    print $OUT "${spaces}\thardware ethernet $mac;\n";
		    print $OUT $hostname;
		    print $OUT "${spaces}\tfixed-address $ip;\n";
		    print $OUT "${spaces}}\n\n";
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		}
	} else {
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	    # It's a regular line
	    print $OUT $_;
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	}
}
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close(IF);
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if ($install) {
    close(OF) or
	fatal("Could not close $outfile");

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    if (-e $DHCPD_TAIL) {
	system("cat $DHCPD_TAIL >> $outfile") == 0 or
	    fatal("Could not add tail to $outfile");
    }

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    if (-e $DHCPD_CONF) {
	system("cp -fp $DHCPD_CONF ${DHCPD_CONF}.old") == 0 or
	    fatal("Could not backup copy of ${DHCPD_CONF}");
    }
    system("mv -f $outfile $DHCPD_CONF") == 0 or
	    fatal("Could not install new ${DHCPD_CONF}");
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    if ($restart) {
	$dpid = `cat /var/run/dhcpd.pid`;
	chomp($dpid);
        # untaint
	if ($dpid =~ /^([\d]+)$/) {
	    $dpid = $1;
	}
	else {
	    fatal("Bad pid for DHCPD: $dpid");
	}
	if (kill('TERM', $dpid) == 0) {
	    fatal("Could not kill(TERM) process $dpid (dhcpd): $!");
	}
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        my $old_uid = $UID;
        $UID = $EUID;
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        for my $subboss (keys %subboss_dhcp_servers) {
            RestartSubbossDhcp($subboss, $restart);
        }
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        $UID = $old_uid;
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    }

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    TBScriptUnlock();
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}
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exit(0);
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#
# Special handling of pxe_boot_path argument.
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#
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# Any specified pxeboot path must start with PXEBOOTDIR (/tftpboot).
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# If path starts with $PXELINUXPREFIX (/tftpboot/pxelinux/) or
# $GPXELINUXPREFIX (/tftpboot/gpxelinux), then the remainder of the
# path identifies the pxelinux configuration file from $PXELINUXCONFIG
# (/tftpboot/pxelinux.cfg) to use. This config file for the node
# (MAC address) will be symlinked to this config file. The PXE boot
# program will be set to either $PXELINUXBOOT or $GPXELINUXBOOT.
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#
# Returns the string to be used for the "filename" option in dhcpd.conf.
#
sub SetupPXEBoot($$$$)
{
    my ($node, $mac, $clear, $str) = @_;

    # get rid of any old pxelinux magic
    if ($clear) {
	ClearPXEBoot($node, $mac);
    }

    return undef
	if (!defined($str));

    # don't allow if outside TFTP directory
    if ($str !~ /^$PXEBOOTDIR\// || $str =~ /\.\./) {
	print STDERR "$node: ignoring bogus pxe_boot_path '$str'\n";
	return undef;
    }

    # if it starts with the magic pxelinux prefix, setup a config file
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    if ($str =~ /^($PXELINUXPREFIX|$GPXELINUXPREFIX)\/(.*)$/) {
	my $path = $1;
	my $cfile = $2;
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	my $cpath = "$PXEBOOTDIR/$PXELINUXCONFIG";

	if (! -r "$cpath/$cfile") {
	    print STDERR "$node: ignoring invalid pxelinux config '$cfile'\n";
	    return undef;
	}

	#
	# XXX ugh. In an inner elab with an inner control network,
	# pxelinux will use the MAC address of the real control net interface
	# to construct its config file name. So we need to look that up.
	#
	if ($ELABINELAB) {
	    my $qr = DBQueryWarn("select MAC from interfaces where ".
				 " node_id='$node' and role='outer_ctrl'");
	    if ($qr && $qr->numrows) {
		my %row = $qr->fetchhash();
		if (defined($row{"MAC"})) {
		    $mac = $row{"MAC"};
		}
	    }
	}

	if ($mac =~ /^(..)(..)(..)(..)(..)(..)$/) {
	    $macname = "01-$1-$2-$3-$4-$5-$6";
	} else {
	    print STDERR "$node: ignoring unparsable MAC address '$mac'\n";
	    return undef;
	}

	if ($install) {
	    if (-e "$cpath/$macname") {
		if (!unlink("$cpath/$macname")) {
		    print STDERR "$node: could not remove old pxelinux config\n";
		    return undef;
		}
	    }
	    if (!symlink($cfile, "$cpath/$macname")) {
		print STDERR "$node: could not symlink to pxelinux config '$cfile'\n";
		return undef;
	    }
	} else {
	    print STDERR "WARNING: not changing pxelinux config for $node\n";
	}

	# return the pxelinux binary
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	if ($path eq $PXELINUXPREFIX) {
	    $str = "$PXEBOOTDIR/$PXELINUXBOOT";
	} else {
	    $str = "$PXEBOOTDIR/$GPXELINUXBOOT";
	}
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    }

    return $str;
}

#
# Make sure there is no pxelinux config for the given node
#
sub ClearPXEBoot($$)
{
    my ($node, $mac) = @_;
    my $cpath = "$PXEBOOTDIR/$PXELINUXCONFIG";

    #
    # XXX ugh. In an inner elab with an inner control network,
    # pxelinux will use the MAC address of the real control net interface
    # to construct its config file name. So we need to look that up.
    #
    if ($ELABINELAB) {
	my $qr = DBQueryWarn("select MAC from interfaces where ".
			     " node_id='$node' and role='outer_ctrl'");
	if ($qr && $qr->numrows) {
	    my %row = $qr->fetchhash();
	    if (defined($row{"MAC"})) {
		$mac = $row{"MAC"};
	    }
	}
    }

    if ($mac =~ /^(..)(..)(..)(..)(..)(..)$/) {
	$macname = "01-$1-$2-$3-$4-$5-$6";
	if ($install) {
	    if (-e "$cpath/$macname" && !unlink("$cpath/$macname")) {
		print STDERR "$node: could not remove old pxelinux config\n";
	    }
	} else {
	    print STDERR "WARNING: not changing pxelinux config for $node\n";
	}
    }
}

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#
# Die.
#
sub fatal {
    my $msg = $_[0];
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    TBScriptUnlock()
	if ($install);
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    die("*** $0:\n".
	"    $msg\n");
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}
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sub RestartSubbossDhcp($$)
{
        my ($subboss, $restart) = @_;
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        my $cmd = "ssh -o ConnectTimeout=5 $subboss @prefix@/sbin/subboss_dhcpd_makeconf";
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        $cmd .= " -r" if ($restart);

        print "Restarting dhcpd on subboss $subboss\n";
        if (system($cmd)) {
	    print STDERR "Failed to restart dhcpd on $subboss\n";
	}
}