staticroutes.in 14.6 KB
Newer Older
1
#!/usr/bin/perl -wT
Leigh B. Stoller's avatar
Leigh B. Stoller committed
2 3 4

#
# EMULAB-COPYRIGHT
5
# Copyright (c) 2000-2003 University of Utah and the Flux Group.
Leigh B. Stoller's avatar
Leigh B. Stoller committed
6 7 8
# All rights reserved.
#

9 10 11 12 13 14 15 16 17 18
use English;
use Getopt::Std;
use Socket;
use IO::Handle;     # thousands of lines just for autoflush :-(

#
# usage: staticroutes <pid> <eid>
#
sub usage()
{
19
    print("Usage: staticroutes [-n [-s|-l|-b]] [-d] [-f] [-t] <pid> <eid>\n".
20
	  "       Use -n to print routes, but leave the DB alone.\n".
21 22 23
	  "       Use -s (with -n) to print routes in NS format.\n".
	  "       Use -b (with -n) to print routes in Freebsd format.\n".
	  "       Use -l (with -n) to print routes in Linux format.\n".
24 25 26 27 28
	  "       Use -d to turn on debugging output.\n".
	  "       Use -t to optimize network routes.\n".
	  "       Use -f to force route calculation; ignore 'static' flag.\n");
    exit(-1);
}
29
my  $optlist = "dnftslb";
30 31 32 33 34 35 36 37 38 39 40

#
# Configure variables
#
my $TB		= "@prefix@";
my $NETMASK	= "255.255.255.0";

my $debug       = 0;
my $routecalc   = "$TB/libexec/routecalc";
my $impotent    = 0;
my $force	= 0;
41
my $optimize    = 1;
42
my $format      = "";
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

#
# Testbed Support libraries
#
use lib "@prefix@/lib";
use libdb;
use libtestbed;

# un-taint path
$ENV{'PATH'} = '/bin:/usr/bin:/usr/local/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

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

#
# Parse command arguments. Once we return from getopts, all that should be
# left are the required arguments.
#
%options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (@ARGV != 2) {
    usage();
}
if (defined($options{"d"})) {
    $debug = 1;
}
if (defined($options{"n"})) {
    $impotent = 1;
}
if (defined($options{"f"})) {
    $force = 1;
}
if (defined($options{"t"})) {
81
    $optimize = 0;
82
}
83 84 85 86 87 88 89 90 91 92 93 94
if (defined($options{"s"})) {
    $format = "ns";
}
if (defined($options{"b"})) {
    $format = "bsd";
}
if (defined($options{"l"})) {
    $format = "suxs";
}
if ($format && !$impotent) {
    usage();
}
95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141

my $pid = $ARGV[0];
my $eid = $ARGV[1];

#
# Untaint args.
#
if ($pid =~ /^([-\@\w]+)$/) {
    $pid = $1;
}
else {
    die("Bad data in pid: $pid.");
}
if ($eid =~ /^([-\@\w]+)$/) {
    $eid = $1;
}
else {
    die("Bad data in eid: $eid.");
}

#
# Get the list of nodes.
# 
my $query_result =
    DBQueryFatal("select vname,ips,routertype from virt_nodes ".
		 "where pid='$pid' and eid='$eid'");

if (!$query_result->numrows) {
    warn("*** $0:\n".
	 "    No nodes in experiment $pid/$eid!\n");
    exit(0);
}

# A Flag.
my $dostatic = 0;

# A map of ips for each node, indexed by vname:port. 
my %ips      = ();

# A map (and reverse map) of node (vname) to unique index.
my %map      = ();
my %rmap     = ();
my $index    = 0;

# A map of lans, where each is a list of the members, indexed by lan.
my %lans     = ();

142
# A reverse map (sorta). Map a pair of links back to the lan they belong to.
143 144
my %rlans    = ();

145
# The costs, indexed by lan. This is kinda bogus, but since the cost
146 147 148
# is the same for each member of a lan, no big deal.
my %costs    = ();

149 150 151 152 153 154
# Number of links per node, indexed by node (vname). This is strictly
# for generating NS style output. When there is more than one link on
# a node, we *must* generate net routes instead of host routes, or the
# parser will be unhappy.
my %linkcount= ();

155 156 157
# list of ports that a node is connected on. Indexed by node.
my %nodeportlist = ();

158 159 160 161 162
#
# Convert list of nodes into a map of $vname:$port to IP. We will need the
# IPs later when filling in the virt_routes table.
# 
while (my ($vname,$ips,$routertype) = $query_result->fetchrow_array) {
163
    if (!$force && $routertype ne TBDB_ROUTERTYPE_STATIC()) {
164 165 166 167
	next;
    }
    $dostatic++;
    
168 169
    $linkcount{$vname} = 0;
    
170 171 172 173
    if (! defined($nodeportlist{$vname}) ) {
      $nodeportlist{$vname} = [];
    }
    
174 175 176 177 178 179 180 181
    foreach my $ipinfo (split(" ", $ips)) {
	my ($port,$ip) = split(":", $ipinfo);
	$ips{"$vname:$port"} = $ip;
	if (! defined($map{$vname})) {
	    $map{$vname}  = $index;
	    $rmap{$index} = $vname;
	    $index++;
	}
182
	push( @{$nodeportlist{$vname}}, $port );
183
	$linkcount{$vname} += 1;
184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
    }
}

if (! $dostatic) {
    warn("No nodes requested static routing in $pid/$eid. This is okay!\n");
    exit(0);
}

#
# Now get the lans. 
#
$query_result =
    DBQueryFatal("select vname,member,cost " .
		 "from virt_lans where pid='$pid' and eid='$eid'");
if (!$query_result->numrows) {
    warn("*** $0:\n".
	 "    No links or lans in experiment $pid/$eid!\n");
    exit(0);
}

while (my ($vname,$member,$cost) = $query_result->fetchrow_array) {
    if (! defined($lans{$vname})) {
	$lans{$vname} = [];
    }
    push(@{$lans{$vname}},$member);
    $costs{$vname} = $cost;
}

#
# We use perl IPC goo to create a child we can both write to and read from
# (normal perl I/O provides just unidirectional I/O to a process).
# 
if (! socketpair(CHILD, PARENT, AF_UNIX, SOCK_STREAM, PF_UNSPEC)) {
    die("*** $0:\n".
	"    socketpair failed: $!\n");
}

CHILD->autoflush(1);
PARENT->autoflush(1);

my $childpid = fork();
if (! $childpid) {
    close CHILD;

    #
    # Dup our descriptors to the parent, and exec the program.
    # The parent then talks to it read/write.
    #
    open(STDIN,  "<&PARENT") || die "Can't redirect stdin";
    open(STDOUT, ">&PARENT") || die "Can't redirect stdout";
    open(STDERR, ">&PARENT") || die "Can't redirect stderr";

    exec($routecalc);
    die("*** $0:\n".
	"    exec $routecalc failed: $!\n");
}
close PARENT;

#
# Okay, now send adjacency info for all the nodes on each lan to the child.
#
foreach my $lan (keys(%lans)) {
    my @members = @{$lans{$lan}};

    foreach my $member1 (@members) {
	foreach my $member2 (@members) {
	    if ($member1 ne $member2) {
		my ($node1,$port1) = split(":", $member1);
		my ($node2,$port2) = split(":", $member2);
		my $id1 = $map{$node1};
		my $id2 = $map{$node2};

		# Reverse mapping for later. 
		$rlans{"$node1:$node2"} = $lan;

		if ($debug) {
		    print STDERR "$member1($id1) $member2($id2)\n";
		}

		print CHILD "i $id1 $id2 $costs{$lan}\n";
	    }
	}
    }
}
# Tell the child to print the routes.
print CHILD "C\n";

#
# Read back the results from the child.
#
my @results = ();
while (<CHILD>) {
    if ($debug) {
	print "$_";
    }
    push(@results, $_);
}
# Tell the child to quit. Then wait for it.
print CHILD "q\n";
waitpid($childpid, 0);
if ($?) {
    die("*** $0:\n".
	"    $routecalc failed with status: $?\n");
}

#
# Parse the routes. Need to map the indices back to nodes, and then form a
# matrix. Why, well you will see in a bit ...
#
my %routes	= ();
my %netroutes   = ();

296 297 298 299
#
# Host route ips for interfaces of a dst node besides the nearest one
# This is indexed by a node (i.e. a "src:dst" node) and is a list of dst ips
# The hop info is obtained from the shortest path route
300
my %hostroutes = ();
301

302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319
foreach my $result (@results) {
    my ($src, $dst, $hop);

    if ($result =~ /route (\d+) to (\d+) via (\d+)/) {
	$src = $rmap{$1};
	$dst = $rmap{$2};
	$hop = $rmap{$3};
    }
    else {
	die("*** $0:\n".
	    "    $routecalc returned a bad line: '$result'\n");
    }
    if ($debug) {
	print "src:$src dst:$dst hop:$hop\n";
    }
    $routes{"$src:$dst"} = $hop;
}

320 321 322
#
# Clean the routes.
#
323 324 325 326
if (! $impotent) {
    DBQueryFatal("delete from virt_routes where ".
		 "pid='$pid' and eid='$eid'");
}
327

328 329 330 331 332 333 334 335 336 337 338 339 340 341
#
# Now it gets fun. We have to go through each src:dst pair in the route
# list. The problem is that the dst could be multihomed and multiple hops
# away, and so we have no idea what interface (IP) we are actually routing
# to. We have to know the IP, or else we won't be able to insert the route!
# So, we use the matrix to recurse through and find our way to the
# destination. When we get to the last hop, we can use the src:dst of that
# last hop to index into rlans, which gives the full lanlink list. Then we
# search that to find the IP.
#
foreach my $route (keys(%routes)) {
    my ($src,$dst) = split(":", $route);
    my $hop  = $routes{$route};
    my $type = 'host';
342
    my $directlyconn = 0;
343
    my $netroutedefined = 0;
344 345
    # remember the port for which we have dstip
    my $dstport;
346 347 348 349 350

    #
    # This is the lan that contains the src and hop. (the link). 
    #
    my $srclan = $rlans{"$src:$hop"};
351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385
    
    #
    # This is the lan that contains the node one hop before dst and dst
    # 
    my $dstlan;
    
    #
    # Members in the srclan and dstlan respectively
    #
    my @srcmembers;
    my @dstmembers;

    #
    # If directly connected, skip adding the route into the DB
    # However, we still need to add a route for other interfaces
    # of the directly connected node
    if ($dst eq $hop) {
	$directlyconn = 1;
	$dstlan = $rlans{"$src:$dst"};
	@dstmembers = @{$lans{$dstlan}};
	@srcmembers = @{$lans{$srclan}};
	#
	# Scan dstmembers till we find the dst. This is the IP we want.
	#
	foreach my $member (@dstmembers) {
	    my ($node,$port) = split(":", $member);
	    
	    if ($node eq $dst) {
		$dstport = $port;
		last;
	    }
	}
	
	goto HOSTROUTES;
    }
386

387 388 389 390 391 392
    #
    # Now we need to find the destination lan (link) by stepping through
    # each hop till we get to it.
    #
    my $nhop = $hop;
    while (1) {
393 394
	# Next hop to destination.
	if (!defined($routes{"$nhop:$dst"})) {
395 396
	    die("*** $0:\n".
		"    Failed to find route: $nhop:$dst!\n");
397 398
	}
	my $nnhop = $routes{"$nhop:$dst"};
399

400 401
	# Last hop to destination.
	if ($nnhop eq $dst) {
402
	    last;
403 404
	}
	$nhop = $nnhop;
405
    }
406
    $dstlan = $rlans{"$nhop:$dst"};
407 408

    if ($debug) {
409 410 411 412 413 414 415
	print "$src --> $dst : $nhop:$dst\n";
    }
    
    #
    # The members of the lan are used to map back to the IPs of the
    # interfaces (since we need IPs to insert route entries).
    #
416 417
    @srcmembers = @{$lans{$srclan}};
    @dstmembers = @{$lans{$dstlan}};
418 419 420

    # Want to find these.
    my ($srcip,$dstip,$hopip);
421
    
422 423 424 425 426 427 428 429
    #
    # Scan dstmembers till we find the dst. This is the IP we want.
    #
    foreach my $member (@dstmembers) {
	my ($node,$port) = split(":", $member);

	if ($node eq $dst) {
	    $dstip = $ips{$member};
430
	    $dstport = $port;
431 432 433 434 435
	    last;
	}
    }

    #
436 437 438
    # If optimzing create a net route and avoid a per-host entry for each
    # pair. Convert the route, but remember we did it so we can skip similar
    # routes in the future.
439
    #
440
    if ($optimize) {
441 442 443 444 445 446 447
	my $newip = inet_ntoa(inet_aton($dstip) & inet_aton($NETMASK));

	if (defined($netroutes{"$src:$newip"})) {
	    if ($netroutes{"$src:$newip"} ne $hop) {
		die("*** $0:\n".
		    "    network route mismatch: $src:$dst:$hop!\n");
	    }
448 449 450 451 452
	    $netroutedefined = 1;
	} else {
	    $netroutes{"$src:$newip"} = $hop;
	    $type  = "net";
	    $dstip = $newip;
453 454 455
	}
    }

456 457
HOSTROUTES:    

458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473
    #
    # Scan srcmembers to find the IPs for the src and hop.
    #
    foreach my $member (@srcmembers) {
	my ($node,$port) = split(":", $member);
	
	if ($node eq $src) {
	    $srcip   = $ips{$member};
	    next;
	}
	if ($node eq $hop) {
	    $hopip = $ips{$member};
	    next;
	}
    }    

474 475 476
    # Construct host routes for the other interfaces of dst
    foreach my $port (@{$nodeportlist{$dst}}) {

477 478 479 480
	# We already have a route for the ip on dstport
	if ( $port eq $dstport ) {
	    next;
	}
481
	
482 483
	my $newip = $ips{"$dst:$port"};
	my $newipsubnet = inet_ntoa(inet_aton($newip) & inet_aton($NETMASK));
484
	
485 486 487 488 489
	# If we already have a route to newipsubnet via the same hop,
	# we don't need the host route
	if ( defined($netroutes{"$src:$newipsubnet"}) &&
	     $netroutes{"$src:$newipsubnet"} eq $hop ) {
	    next;
490
	} else {	    
491
	    $hostroutes{"$src:$srcip%$dst:$newip"} = "$hop:$hopip";
492 493
	}
    }
494 495 496 497 498 499 500

    # We had to run till here to store hostroutes
    # that may have to be added later. However,
    # we can skip for directly connected neighbors
    # or if net route was already defined
    if ($directlyconn || $netroutedefined) {
	next;
501
    }
502
    
503 504
    if ($impotent) {
	if ($debug) {
505 506 507
	    printf(STDERR "%s: %-23s --> %-23s - %s\n",
		   ($type eq "net" ? "n" : "h"),
		   "$src:$srcip", "$dst:$dstip", "$hop:$hopip");
508 509
	}
	if ($format eq "ns") {
510 511 512 513 514 515
	    print "\$${src} add-route ";
	    if ($type eq "host" && $linkcount{$dst} == 1) {
		print "\$${dst} \$${hop}\n";
	    }
	    else {
		print "\$${dstlan} \$${hop}\n";
516 517 518
	    }
	}
	elsif ($format eq "bsd") {
519 520
	    if ($type eq "host") {
		print "route add -host $dstip $hopip\n";
521
	    }
522 523
	    else {
		print "route add -net $dstip $hopip $NETMASK\n";
524
	    }
525 526
	}
	elsif ($format eq "suxs") {
527
	    if ($type eq "host") {
528 529
		print "route add -host $dstip gw $hopip\n";
	    }
530 531
	    else {
		print "route add -net $dstip netmask $NETMASK gw $hopip\n";
532
	    }
533
	}
534
    }
535
    else {
536 537 538 539 540 541 542 543 544 545 546 547
	DBQueryFatal("insert into virt_routes ".
		     " (pid,eid,vname,src,dst,nexthop,dst_type) ".
		     " values ('$pid', '$eid', '$src', '$srcip', '$dstip', ".
		     "         '$hopip', '$type')");
    }
}

# This part adds host routes for subnets that don't have a route.
# However, the first route will be added as a net route
# and if subsequent host routes are different from the first
# route we added, only then will the host routes get added.
foreach my $hostroute (keys(%hostroutes)) {
548
    my ($srcinfo,$dstinfo) = split("%", $hostroute);
549 550 551 552 553 554 555 556 557 558 559 560
    my ($src,$srcip) = split(":", $srcinfo);
    my ($dst,$dstip) = split(":", $dstinfo);
    my ($hop,$hopip) = split(":", $hostroutes{$hostroute});
    my $type = 'host';
    
    my $dstipsubnet = inet_ntoa(inet_aton($dstip) & inet_aton($NETMASK));
    
    # If we already have a net route to dstipsubnet via the same hop,
    # we don't need the host route
    if ( defined($netroutes{"$src:$dstipsubnet"}) ) {
	if ($netroutes{"$src:$dstipsubnet"} eq $hop ) {
	    next;
561
	}
562
    } else {
563 564 565 566 567 568 569 570 571

	# We do the following optimization only for
	# hosts that are _not_ directly connected
	# neighbors. Otherwise, adding interface 
	# subnet routes fail. Even with this certain
	# redundant links might be unused since the
	# route calculator ended up choosing one of
	# the routes over the other(s)
	if ($optimize && ($dst ne $hop)) {
572 573 574
	    $netroutes{"$src:$dstipsubnet"} = $hop;
	    $type = "net";
	    $dstip = $dstipsubnet;
575
	}
576
    }
577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608
    
    if ($impotent) {
	if ($debug) {
	    printf(STDERR "%s: %-23s --> %-23s - %s\n",
		   ($type eq "net" ? "n" : "h"),
		   "$src:$srcip", "$dst:$dstip", "$hop:$hopip");
	}
	# No need to print the host routes in the 'ns' case
	# since we already have printed a route for $dst
	if ($format eq "bsd") {	    
	    if ($type eq "host") {
		print "route add -host $dstip $hopip\n";
	    }
	    else {
		print "route add -net $dstip $hopip $NETMASK\n";
	    }
	}
	elsif ($format eq "suxs") {
	    if ($type eq "host") {
		print "route add -host $dstip gw $hopip\n";
	    }
	    else {
		print "route add -net $dstip netmask $NETMASK gw $hopip\n";
	    }
	}
    }
    else {
	DBQueryFatal("insert into virt_routes ".
		     " (pid,eid,vname,src,dst,nexthop,dst_type) ".
		     " values ('$pid', '$eid', '$src', '$srcip', '$dstip', ".
		     "         '$hopip', '$type')");
    }
609 610 611
}

exit 0;
612 613 614