dhcpd_makeconf.in 19.6 KB
Newer Older
1
#!/usr/bin/perl -w
Leigh B. Stoller's avatar
Leigh B. Stoller committed
2
#
3
# Copyright (c) 2000-2014 University of Utah and the Flux Group.
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
# 
# {{{EMULAB-LICENSE
# 
# This file is part of the Emulab network testbed software.
# 
# This file is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# 
# This file is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
# License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.
# 
# }}}
Leigh B. Stoller's avatar
Leigh B. Stoller committed
23
#
24
use English;
25
use Getopt::Std;
26
use Fcntl ':flock';
27
use Socket;
Robert Ricci's avatar
Robert Ricci committed
28

29 30 31 32
#
# 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
33
# filled out. See the template file in the dhcp directory for an example.
34
#
35 36 37 38 39
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";
40
    print "-r 	Restart DHCPD after config file regeneration (with -i only)\n";
41 42 43 44
    print "Without -i, spits out a dhcpd config file on stdout, as in:\n";
    print "  $0 > dhcpd.conf\n";
    exit(1);
}
45
my $optlist = "ihvt:r";
46 47
my $install = 0;
my $vnames  = 0;
48
my $restart = 0;
49

50
#
51
# Configure variables
52
#
53
my $TBOPS       = "@TBOPSEMAIL@";
54
my $ELABINELAB  = @ELABINELAB@;
55 56
my $BOSSNODE_IP = "@BOSSNODE_IP@";
my $OURDOMAIN   = "@OURDOMAIN@";
57 58 59
my $MANAGEMENT_NETWORK = "@MANAGEMENT_NETWORK@";
my $MANAGEMENT_NETMASK = "@MANAGEMENT_NETMASK@";
my $MANAGEMENT_GATEWAY = "@MANAGEMENT_ROUTER@";
60 61 62 63 64 65 66 67

# 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;

68
use lib "@prefix@/lib";
69 70
use libdb;
use libtestbed;
71
use Node;
72 73 74
use Experiment;
use EmulabFeatures;
use EmulabConstants;
75

76
# Tell EmulabFeatures to take it down a notch.
77 78
$EmulabFeatures::verbose = 0;

79 80 81 82 83 84 85 86
#
# PXE boot constants
#
my $PXEBOOTDIR	    = "/tftpboot";
my $PXELINUXPREFIX  = "$PXEBOOTDIR/pxelinux";
my $PXELINUXBOOT    = "pxelinux.0";
my $PXELINUXCONFIG  = "pxelinux.cfg";

87 88 89 90
# XXX hack for now to support gpxelinux as well
my $GPXELINUXPREFIX = "$PXEBOOTDIR/gpxelinux";
my $GPXELINUXBOOT   = "gpxelinux.0";

91
my $CRTLTAG	    = TBDB_IFACEROLE_CONTROL();
92
my $MNGMNTTAG	    = TBDB_IFACEROLE_MANAGEMENT();
93 94
my $DHCPD_CONF	    = "/usr/local/etc/dhcpd.conf";
my $DHCPD_TEMPLATE  = "/usr/local/etc/dhcpd.conf.template";
95
my $DHCPD_TAIL      = "/usr/local/etc/dhcpd.conf.tail";
96
my %servernodes	    = ();
97 98 99
my %dhcp_subbosses  = ();
my %tftp_subbosses  = ();
my %bootinfo_subbosses  = ();
100
my %singlectlnet    = ();
101
my %extman_cache    = ();
102 103
my $template        = $DHCPD_TEMPLATE;
my $outfile	    = "/tmp/dhcpd_makeconf.$$";
104
my $OUT		    = *STDOUT;
105
my %subboss_dhcp_servers;
106 107 108
my %management_ifaces;
my $m_network = inet_ntoa(inet_aton($MANAGEMENT_NETWORK) &
			  inet_aton($MANAGEMENT_NETMASK));
109 110

sub RestartSubbossDhcp($$);
111 112
sub SetupPXEBoot($$$$);
sub ClearPXEBoot($$);
113

114
#
115 116
# Parse command arguments. Once we return from getopts, all that should
# left are the required arguments.
117
#
118 119 120 121 122 123
%options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (defined($options{"i"})) {
    $install = 1;
124

125 126 127 128 129
    # We don't want to run this script unless its the real version.
    if ($EUID != 0) {
	die("*** $0:\n".
	    "    Must be root! Maybe its a development version?\n");
    }
130 131 132
    if (defined($options{"r"})) {
	$restart = 1;
    }
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
}
if (defined($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");
    }
}
153

Robert Ricci's avatar
Robert Ricci committed
154
#
155
# If we are going to actually install this file, must serialize to
156
# avoid a trashed config file.
Robert Ricci's avatar
Robert Ricci committed
157
#
158
if ($install) {
159 160 161 162
    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");
163
    }
Robert Ricci's avatar
Robert Ricci committed
164

165 166
    #
    # Open temporary output file.
167
    #
168 169 170 171
    open(OF, ">$outfile") or
	fatal("Could not open $outfile\n");
    $OUT = *OF;
}
Robert Ricci's avatar
Robert Ricci committed
172

173 174 175 176 177 178 179 180 181 182 183 184 185
#
# 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 $query_result =
    DBQueryWarn("select r.node_id,i.IP,r.pid,r.eid ".
		"from reserved as r ".
                "left join interfaces as i on ".
                "     r.node_id=i.node_id ".
                "where (r.inner_elab_role='boss' or ".
		"       r.inner_elab_role='boss+router' or ".
186
		"       r.inner_elab_role='boss+fs+router' or ".
187 188 189 190 191 192 193
		"       r.plab_role='plc') and ".
		"      i.role='$CRTLTAG' ");
if (! $query_result) {
    fatal("Could not dhcpd data from DB!");
}
while (my %row = $query_result->fetchhash()) {
    if (defined($row{"pid"}) && defined($row{"eid"})) {
194 195 196
	my $pid = $row{"pid"};
	my $eid = $row{"eid"};
	my $tag = "${pid}:${eid}";
197

198
	$servernodes{$tag} = $row{"IP"};
199 200 201 202 203 204 205 206 207 208 209 210 211

	#
	# 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;
	}
212 213 214
    }
}

215 216 217 218 219 220
# 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.
$query_result =
    DBQueryWarn("select s.node_id, s.service, s.subboss_id, i.IP ".
		"from subbosses as s left join interfaces as i on ".
221
		"s.subboss_id=i.node_id where i.role='$CRTLTAG' and s.disabled=0");
222 223 224 225 226 227
if (! $query_result) {
    fatal("Could not dhcpd data from DB!");
}
while (my %row = $query_result->fetchhash()) {
    my $node_id = $row{"node_id"};

228 229 230 231 232 233 234
    # 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;

235 236 237 238 239 240 241 242 243
    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"};
    }
}

244 245
open(IF,"<$template") or
    fatal("Unable to open $template for reading");
Robert Ricci's avatar
Robert Ricci committed
246
while (<IF>) {
247 248 249 250 251
	if (/^(\s*)range\s*;/) {
		# Comment out a null DHCPD_DYNRANGE line.
		my $spaces = $1;
		print $OUT "${spaces}#range ... ...;\n";
	} elsif (/^(\s*)\%\%nodetype=(\w+)/) {
Robert Ricci's avatar
Robert Ricci committed
252 253
		my $spaces = $1;
		my $nodetype = $2;
254 255

		$query_result =
256 257
		    DBQueryWarn("select n.node_id,n.type, ".
				"       n.pxe_boot_path,n.next_pxe_boot_path,".
258 259
				"       i.IP,i.MAC,r.pid,r.eid,r.vname, ".
				"       r.inner_elab_role,r.inner_elab_boot, ".
260
				"       r.plab_role,r.plab_boot,i.role ".
261 262 263 264 265 266 267 268
				"from nodes as n ".
				"left join interfaces as i on ".
				"     n.node_id=i.node_id ".
				"left join node_types as t on n.type=t.type ".
				"left join reserved as r on ".
				"     n.node_id=r.node_id ".
				"where (n.type='$nodetype' or ".
				"       t.class='$nodetype') and ".
269 270 271
				"      (i.role='$CRTLTAG' or ".
				"       (i.role='$MNGMNTTAG' and ".
				"        t.isremotenode=0)) ".
272 273 274
				"order BY n.priority");
		if (! $query_result) {
		    fatal("Could not dhcpd data from DB!");
Robert Ricci's avatar
Robert Ricci committed
275
		}
276 277 278 279

		while (my %row = $query_result->fetchhash()) {
		    my $ip  = $row{"IP"};
		    my $mac = $row{"MAC"};
280
		    my $role = $row{"role"};
281 282
		    my $node_id;
		    my $next_server = "";
283
		    my $bootinfo_server = "";
284
		    my $hostname = "";
285
		    my $dns = "";
286
		    my $booting = "";
287
		    my $filename = "";
288
		    my $tag;
289
		    my $extman = 0;
290 291 292 293 294 295 296

		    if ($vnames && defined($row{"vname"})) {
			$node_id = $row{"vname"};
		    }
		    else {
			$node_id = $row{"node_id"};
		    }
297

298 299 300 301 302
		    #
		    # Grab some information for nodes that are
		    # currently reserved to an experiment.  In
		    # addition to setting a simple tag for further
		    # lookups below, check to see if a node's current
303
		    # experiment is marked for
304 305 306 307 308 309
		    # external management. This state is used below in
		    # determining whether or not to disable a node in
		    # the dhcp config file.  Keep a cache of this
		    # experiment-level info so that we don't have to
		    # hit the DB for each and every node.
		    #
310 311
		    if (defined($row{"pid"})) {
			$tag = $row{"pid"} . ":" . $row{"eid"};
312

Kirk Webb's avatar
Kirk Webb committed
313
			if (!exists($extman_cache{$tag})) {
314 315 316 317 318 319
			    my $experiment = Experiment->Lookup($row{"pid"},
								$row{"eid"});
			    $extman = $extman_cache{$tag} = 
				defined($experiment) &&
				EmulabFeatures->FeatureEnabled(
				    "ExternalNodeManagement", undef, undef,
320
				    $experiment);
321 322 323 324
			}
			else {
			    $extman = $extman_cache{$tag};
			}
325 326
		    }

327 328
		    # Management ports, nothing special to do.
		    if ($role eq TBDB_IFACEROLE_MANAGEMENT()) {
329 330 331 332 333 334 335 336 337 338 339 340
			my $network = inet_ntoa(inet_aton($ip) &
						inet_aton($MANAGEMENT_NETMASK));
			
			#
			# Ick, hack to get management interfaces onto
			# a different subnet in the dhcpd file. Needs to
			# be further generalized.
			#
			if ($network eq $m_network) {
			    push(@management_ifaces, [$node_id, $ip, $mac]);
			    next;
			}
341 342 343 344
			$hostname =
			    "${spaces}\toption host-name \"${node_id}-mng\";\n";
			goto spit;
		    }
345

346
		    #
347 348 349 350
		    # Neuter dhcp nodes reserved to experiments which
		    # are marked for external node management.  Some
		    # other entity will be responsible for
		    # bootstrapping them in this case.
351
		    #
352
		    if ($extman) {
353 354 355 356
			$hostname = "${spaces}\toption host-name ".
			    "\"$node_id\";\n";
			$booting  = "${spaces}\tignore booting;\n";
			goto spit;
357 358
		    }

359 360 361
		    #
		    # Do different stuff for elabinelab / plab nodes.
		    #
362
		    if (defined($tag) && defined($servernodes{$tag}) &&
363 364 365 366 367 368
			(($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"))) {
369

Mike Hibler's avatar
Mike Hibler committed
370 371 372 373 374 375 376 377 378 379
			#
			# 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 {
380 381 382 383 384 385 386 387 388 389 390
			    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";
			    }
391
			}
392
		    }
393 394 395
		    #
		    # Defer to subbosses for dhcp and/or tftp if delegated.
		    #
396 397 398 399
		    elsif (defined $dhcp_subbosses{$node_id}) {
			$hostname =
			    "${spaces}\toption host-name \"$node_id\";\n";
	                $booting = "${spaces}\tignore booting;\n";
400 401 402 403
		        if (defined $tftp_subbosses{$node_id}) {
			    $next_server = "${spaces}\tnext-server " .
			        $tftp_subbosses{$node_id} . ";\n";
		        }
404
		    }
405 406 407
		    #
		    # The default case: just a plain old TB node.
		    #
408 409 410
		    else {
			$hostname =
			    "${spaces}\toption host-name \"$node_id\";\n";
411

412 413 414 415
		        if (defined $tftp_subbosses{$node_id}) {
			    $next_server = "${spaces}\tnext-server " .
			        $tftp_subbosses{$node_id} . ";\n";
		        }
416

417 418 419 420
		        if (defined $bootinfo_subbosses{$node_id}) {
			    $bootinfo_server = "${spaces}\toption PXE.emulab-bootinfo " .
			        $bootinfo_subbosses{$node_id} . ";\n";
		        }
421

422
		    }
423

424 425
		    #
		    # Handle alternate boot program filename if it exists.
426 427 428 429 430 431 432
		    # 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).
433
		    #
434 435 436 437 438
		    my $pxeboot = $row{"next_pxe_boot_path"};
		    if (!$pxeboot) {
			$pxeboot = $row{"pxe_boot_path"};
		    }
		    $filename = SetupPXEBoot($node_id, $mac, 1, $pxeboot);
439
		    if (!$filename) {
440 441 442 443
			# Get the node or node type default
			my $nobj = Node->Lookup($node_id);
			if (!$nobj) {
			    fatal("Could not find Node info for $node_id");
444
			}
445 446
			my $path = $nobj->default_pxeboot();
			$filename = SetupPXEBoot($node_id, $mac, 0, $path);
447 448 449
		    }
		    if ($filename) {
			$filename = "${spaces}\tfilename \"$filename\";\n";
450
		    }
451
		  spit:
452 453 454 455
		    # Need to make MAC look right..
		    $mac =~ s/(..)\B/$1:/g;

		    print $OUT "${spaces}host $ip {\n";
456 457
		    print $OUT $filename
			if (defined($filename));
458
		    print $OUT $next_server;
459
		    print $OUT $bootinfo_server;
460
		    print $OUT $dns;
461
		    print $OUT $booting;
462 463 464 465
		    print $OUT "${spaces}\thardware ethernet $mac;\n";
		    print $OUT $hostname;
		    print $OUT "${spaces}\tfixed-address $ip;\n";
		    print $OUT "${spaces}}\n\n";
Robert Ricci's avatar
Robert Ricci committed
466
		}
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503
	} elsif (/^(\s*)\%\%management/) {
	    my $spaces = $1;
	    my $net  = $MANAGEMENT_NETWORK;
	    my $mask = $MANAGEMENT_NETMASK;
	    my $gate = $MANAGEMENT_GATEWAY;
	    
	    if (@management_ifaces) {
		my @lines =
		    ("subnet $net netmask $mask {",
		     "    option subnet-mask          $mask;",
		     "    option routers              $gate;",
		     "    option domain-name-servers  $BOSSNODE_IP;",
		     "    option domain-name          \"$OURDOMAIN\";",
		     "    next-server                 $BOSSNODE_IP;",
		     "",
		     "",
		     "    group {");
		foreach my $ref (@management_ifaces) {
		    my ($hostname, $ip, $mac) = @{$ref};
		    # naming convention.
		    $hostname .= "-mng";

		    # Need to make MAC look right..
		    $mac =~ s/(..)\B/$1:/g;

		    push(@lines,
			 "        host $ip {",
			 "            hardware ethernet $mac;",
			 "            option host-name \"$hostname\";",
			 "            fixed-address $ip;",
			 "        }\n");
		}
		@lines = (@lines, "   }", "}");
		foreach my $line (@lines) {
		    print $OUT $spaces . $line . "\n";
		}
	    }
Robert Ricci's avatar
Robert Ricci committed
504
	} else {
505 506
	    # It's a regular line
	    print $OUT $_;
Robert Ricci's avatar
Robert Ricci committed
507 508
	}
}
509
close(IF);
510 511 512 513 514

if ($install) {
    close(OF) or
	fatal("Could not close $outfile");

515 516 517 518 519
    if (-e $DHCPD_TAIL) {
	system("cat $DHCPD_TAIL >> $outfile") == 0 or
	    fatal("Could not add tail to $outfile");
    }

520 521 522 523 524 525
    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}");
526 527 528 529 530 531 532 533 534 535 536 537

    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) {
538 539 540 541
	    fatal("Could not kill(TERM) process $dpid (dhcpd): $!.\n".
		  "    dhcpd will NOT be restarted.\n".
		  "    Restart manually with ".
		  "'/usr/local/etc/rc.d/2.dhcpd.sh start'\n");
542
	}
543

544 545
        my $old_uid = $UID;
        $UID = $EUID;
546 547 548
        for my $subboss (keys %subboss_dhcp_servers) {
            RestartSubbossDhcp($subboss, $restart);
        }
549
        $UID = $old_uid;
550 551
    }

552
    TBScriptUnlock();
553
}
554
exit(0);
Robert Ricci's avatar
Robert Ricci committed
555

556 557
#
# Special handling of pxe_boot_path argument.
558
#
559
# Any specified pxeboot path must start with PXEBOOTDIR (/tftpboot).
560 561 562 563 564 565
# 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.
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587
#
# 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
588 589 590
    if ($str =~ /^($PXELINUXPREFIX|$GPXELINUXPREFIX)\/(.*)$/) {
	my $path = $1;
	my $cfile = $2;
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636
	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
637 638 639 640 641
	if ($path eq $PXELINUXPREFIX) {
	    $str = "$PXEBOOTDIR/$PXELINUXBOOT";
	} else {
	    $str = "$PXEBOOTDIR/$GPXELINUXBOOT";
	}
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
    }

    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";
	}
    }
}

683 684 685 686 687
#
# Die.
#
sub fatal {
    my $msg = $_[0];
688

689 690
    TBScriptUnlock()
	if ($install);
691

692 693
    die("*** $0:\n".
	"    $msg\n");
Robert Ricci's avatar
Robert Ricci committed
694
}
695

696 697 698
sub RestartSubbossDhcp($$)
{
        my ($subboss, $restart) = @_;
699
        
700
        my $cmd = "ssh -o ConnectTimeout=5 $subboss @prefix@/sbin/subboss_dhcpd_makeconf";
701 702 703 704 705 706 707 708

        $cmd .= " -r" if ($restart);

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