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#!/usr/bin/perl -wT
#
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# Copyright (c) 2011-2016 University of Utah and the Flux Group.
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# 
# {{{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/>.
# 
# }}}
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#
use English;
use strict;
use Getopt::Std;
use XML::Simple;
use Data::Dumper;
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use IO::Handle;
use URI::Escape;
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use Cwd qw(realpath);
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#
# Create a new node from a XML description. 
#
sub usage()
{
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    print("Usage: newnode [-d] [-v] [-f] [xmlfile]\n\n");
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    print("  -d  print debug information\n");
    print("  -v  verify permissions: do not execute commands\n");
    print("  -n  print out commands: do not execute commands\n");
    exit(-1);
}
my $optlist = "dvn";
my $debug   = 0;
my $verify  = 0;
my $fake    = 0;

#
# Configure variables
#
#my $TB		= "@prefix@";
my $TB = "/usr/testbed/";
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my $GENIRACK    = @PROTOGENI_GENIRACK@;
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#
# Untaint the path
#
$ENV{'PATH'} = "$TB/bin:$TB/sbin:/bin:/usr/bin:/usr/bin:/usr/sbin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

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

#
# Load the Testbed support stuff.
#
use lib "/usr/testbed/lib";
use libdb;
use libtestbed;
use User;
use Project;
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use EmulabFeatures;
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# Protos
sub fatal($);
sub UserError(;$);
sub PrintResult($);
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sub ModifyRow($$);
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sub RemoveRow($);
sub ResolveRow($);
sub CommitNode($);
sub CommitInterface($);
sub CommitWire;
sub CommitInterfaceType($);

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my $useScriptFeature = $GENIRACK ||
    EmulabFeatures->FeatureEnabled("ScriptNewNodes", undef, undef, undef);
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#
# Parse command arguments. Once we return from getopts, all that should be
# left are the required arguments.
#
my %options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (defined($options{"d"})) {
    $debug = 1;
}
if (defined($options{"v"})) {
    $verify = 1;
}
if (defined($options{"n"})) {
    $fake = 1;
}
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if (@ARGV > 1) {
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    usage();
}
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my $xmlfile;
if (scalar(@ARGV) >= 1) {
  $xmlfile = shift(@ARGV);
}
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#
# Map invoking user to object. 
# If invoked as "nobody" we are coming from the web interface and the
# current user context is "implied" (see tbauth.php3).
#
my $this_user;

if (getpwuid($UID) ne "nobody") {
    $this_user = User->ThisUser();

    if (! defined($this_user)) {
	fatal("You ($UID) do not exist!");
    }
    fatal("You must have admin privledges to create new nodes")
	if (!$this_user->IsAdmin());
}
else {
    #
    # Check the filename when invoked from the web interface; must be a
    # file in /tmp.
    #
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    if (defined($xmlfile)) {
	if ($xmlfile =~ /^([-\w\.\/]+)$/) {
	    $xmlfile = $1;
	}
	else {
	    fatal("Bad data in pathname: $xmlfile");
	}
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	# Use realpath to resolve any symlinks.
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	my $translated = realpath($xmlfile);
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	if ($translated =~ /^(\/tmp\/[-\w\.\/]+)$/) {
	    $xmlfile = $1;
	}
	else {
	    fatal("Bad data in translated pathname: $xmlfile");
	}
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    }

    # The web interface (and in the future the xmlrpc interface) sets this.
    $this_user = User->ImpliedUser();

    if (! defined($this_user)) {
	fatal("Cannot determine implied user!");
    }
}

#
# These are the fields that we allow to come in from the XMLfile.
#
my $SLOT_OPTIONAL	= 0x1;	# The field is not required.
my $SLOT_REQUIRED	= 0x2;  # The field is required and must be non-null.
my $SLOT_ADMINONLY	= 0x4;  # Only admins can set this field.
#
# XXX We should encode all of this in the DB so that we can generate the
# forms on the fly, as well as this checking code.
#

my %nodefields =
    # XML Field Name        DB slot name         Flags             Default
    ("command"		=> ["command",		$SLOT_REQUIRED],
     "table"		=> ["table",		$SLOT_REQUIRED],
     "id"		=> ["new_node_id",	$SLOT_OPTIONAL,    undef],
     "node_id"		=> ["node_id",		$SLOT_OPTIONAL,    undef],
     "type"		=> ["type",		$SLOT_OPTIONAL,    undef],
     "IP"		=> ["IP",		$SLOT_OPTIONAL,    undef],
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     "role"		=> ["role",		$SLOT_OPTIONAL,    undef],
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     "identifier"      	=> ["identifier",      	$SLOT_OPTIONAL,	   undef]);

my %ifacefields =
    # XML Field Name        DB slot name         Flags             Default
    ("command"          => ["command",          $SLOT_REQUIRED],
     "table"		=> ["table",		$SLOT_REQUIRED],
     "id"		=> ["new_interface_id",	$SLOT_OPTIONAL,    undef],
     "node_id"          => ["new_node_id",      $SLOT_OPTIONAL,    undef],
     "card"             => ["card",             $SLOT_OPTIONAL,    undef],
     "port"             => ["port",             $SLOT_OPTIONAL,    undef],
     "mac"              => ["mac",              $SLOT_OPTIONAL,    undef],
     "type"             => ["interface_type",   $SLOT_OPTIONAL,    undef],
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     "role"		=> ["role",		$SLOT_OPTIONAL,    undef],
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     "IP"		=> ["IP",		$SLOT_OPTIONAL,    undef],
     "switch_id"	=> ["switch_id",	$SLOT_OPTIONAL,    undef],
     "switch_card"	=> ["switch_card",	$SLOT_OPTIONAL,    undef],
     "switch_port"	=> ["switch_port",	$SLOT_OPTIONAL,    undef]);
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my %wirefields =
    # XML Field Name        DB slot name         Flags             Default
    ("command"          => ["command",          $SLOT_REQUIRED],
     "table"		=> ["table",		$SLOT_REQUIRED],
     "id"		=> ["new_wire_id",	$SLOT_OPTIONAL,    undef],
     "node_id1"        	=> ["node_id1",         $SLOT_OPTIONAL,    undef],
     "card1"      	=> ["card1",      	$SLOT_OPTIONAL,    undef],
     "port1"      	=> ["port1",      	$SLOT_OPTIONAL,    undef],
     "node_id2"        	=> ["node_id2",        	$SLOT_OPTIONAL,    undef],
     "card2"      	=> ["card2",      	$SLOT_OPTIONAL,    undef],
     "port2"      	=> ["port2",      	$SLOT_OPTIONAL,    undef],
     "cable"            => ["cable",            $SLOT_OPTIONAL,    undef],
     "len"              => ["len",              $SLOT_OPTIONAL,    undef],
     "type"             => ["type",             $SLOT_OPTIONAL,    undef]);

my %interfacetypefields =
    # XML Field Name        DB slot name         Flags             Default
    ("command"          => ["command",          $SLOT_REQUIRED],
     "table"		=> ["table",		$SLOT_REQUIRED],
     "id"		=> ["new_interface_type_id",	$SLOT_OPTIONAL,    ""],
     "type"		=> ["type",		$SLOT_OPTIONAL,    ""],
     "max_speed"       	=> ["max_speed",	$SLOT_OPTIONAL,    ""],
     "full_duplex"	=> ["full_duplex",	$SLOT_OPTIONAL,    ""],
     "manufacturer"	=> ["manufacturer",	$SLOT_OPTIONAL,    ""],
     "model"		=> ["model",		$SLOT_OPTIONAL,    ""],
     "ports"		=> ["ports",		$SLOT_OPTIONAL,    ""],
     "connector"	=> ["connector",	$SLOT_OPTIONAL,    ""],
    );

#
# Must wrap the parser in eval since it exits on error.
#
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my $xmlparse;
if (defined($xmlfile)) {
  $xmlparse = eval { XMLin($xmlfile,
			   VarAttr => 'name',
			   ContentKey => '-content',
			   SuppressEmpty => undef); };
  fatal($@)
      if ($@);
} else {
    my $handle = new IO::Handle;
    $xmlparse = eval { XMLin($handle->fdopen(fileno(STDIN),"r"),
			     VarAttr => 'name',
			     ContentKey => '-content',
			     SuppressEmpty => undef); };
  fatal($@)
      if ($@);
}
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#
# Process and dump the errors (formatted for the web interface).
# We should probably XML format the errors instead but not sure I want
# to go there yet.
#
my %errors = ();
my %xmlfields;
my $table;
my $tableid;
my $tabledb;

if (exists($xmlparse->{'attribute'}->{"table"}->{"value"})) {
    $table = $xmlparse->{'attribute'}->{"table"}->{"value"};
} else {
    $errors{"table"} = "Required value not provide";
}
UserError()
    if (keys(%errors));

my $commit;

if ($table eq "node") {
    %xmlfields = %nodefields;
    $commit = \&CommitNode;
    $tableid = "new_node_id";
    $tabledb = "new_nodes";
} elsif ($table eq "interface") {
    %xmlfields = %ifacefields;
    $commit = \&CommitInterface;
    $tableid = "new_interface_id";
    $tabledb = "new_interfaces";
} elsif ($table eq "wire") {
    %xmlfields = %wirefields;
    $commit = \&CommitWire;
    $tableid = "new_wire_id";
    $tabledb = "new_wires";
} elsif ($table eq "interface_type") {
    %xmlfields = %interfacetypefields;
    $commit = \&CommitInterfaceType;
    $tableid = "new_interface_type_id";
    $tabledb = "new_interface_types";
} else {
    $errors{"table"} = "Table value not valid";
}
UserError()
    if (keys(%errors));

#
# Make sure all the required arguments were provided.
#
my $key;
foreach $key (keys(%xmlfields)) {
    my (undef, $required, undef) = @{$xmlfields{$key}};

    $errors{$key} = "Required value not provided"
	if ($required & $SLOT_REQUIRED  &&
	    ! exists($xmlparse->{'attribute'}->{"$key"}));
}
UserError()
    if (keys(%errors));


#
# We build up an array of arguments to pass to the database as we check
# the attributes.
#
my %args = ();

foreach $key (keys(%{ $xmlparse->{'attribute'} })) {
    my $value = $xmlparse->{'attribute'}->{"$key"}->{'value'};
    if (!defined($value)) {	# Empty string comes from XML as an undef value.
	$xmlparse->{'attribute'}->{"$key"}->{'value'} = $value = "";
    }

    print STDERR "User attribute: '$key' -> '$value'\n"
	if ($debug);

    my $field = $key;
    if (!exists($xmlfields{$key})) {
	$errors{$key} = "Unknown attribute";
	next; # foreach $key
    }

    my ($dbslot, $required, $default) = @{$xmlfields{$field}};

    if ($required & $SLOT_REQUIRED) {
	# A slot that must be provided, so do not allow a null value.
	if (!defined($value)) {
	    $errors{$key} = "Must provide a non-null value";
	    next;
	}
    }
    if ($required & $SLOT_OPTIONAL) {
	# Optional slot. If value is null skip it. Might not be the correct
	# thing to do all the time?
	if (!defined($value)) {
	    next
		if (!defined($default));
	    $value = $default;
	}
    }
    if ($required & $SLOT_ADMINONLY) {
	# Admin implies optional, but thats probably not correct approach.
	$errors{$key} = "Administrators only"
	    if (! $this_user->IsAdmin());
    }

    $args{$dbslot} = $value;

    # Now check that the value is legal.

# TODO: Exempt command and table
#    if (! TBcheck_dbslot($value, "new_nodes",
#			 $dbslot, TBDB_CHECKDBSLOT_ERROR)) {
#	$errors{$key} = TBFieldErrorString();
#	next;
#    }
}
UserError()
    if (keys(%errors));

my $id = $args{$tableid};
if (! defined($id) && $args{"command"} ne "list"
    && $args{"command"} ne "add") {
    $errors{"id"} = "Command " . $args{"command"} . " must have an id";
}
if ($args{"command"} eq "add") {
} elsif ($args{"command"} eq "update") {
} elsif ($args{"command"} eq "rollback") {
} elsif ($args{"command"} eq "commit") {
} elsif ($args{"command"} eq "resolve") {
} elsif ($args{"command"} eq "list") {
} else {
    $errors{"command"} = "Command must be add, update, rollback, commit, ".
	"resolve, or list";
}
UserError()
    if (keys(%errors));

exit(0)
    if ($verify);

my $rowlist;
if ($args{"command"} eq "add") {
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    ModifyRow($id, 0);
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} elsif ($args{"command"} eq "update") {
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    ModifyRow($id, 1);
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} elsif ($args{"command"} eq "rollback") {
    RemoveRow($id);
} elsif ($args{"command"} eq "commit") {
    &$commit($id);
} elsif ($args{"command"} eq "resolve") {
    $rowlist = ResolveRow($id);
    PrintResult($rowlist);
} elsif ($args{"command"} eq "list") {
    $rowlist = ResolveRow(undef);
    PrintResult($rowlist);
}
UserError()
    if (keys(%errors));

print "Completed ".$args{"command"}." on table $table\n";

exit(0);

sub fatal($)
{
    my ($mesg) = @_;

    print STDERR "*** $0:\n".
	         "    $mesg\n";
    # Exit with negative status so web interface treats it as system error.
    exit(-1);
}

sub UserError(;$)
{
    my ($mesg) = @_;

    if (keys(%errors)) {
	foreach my $key (keys(%errors)) {
	    my $val = $errors{$key};
	    print "${key}: $val\n";
	}
    }
    print "$mesg\n"
	if (defined($mesg));

    # Exit with positive status so web interface treats it as user error.
    exit(1);
}

sub PrintResult($)
{
    my ($result) = @_;
    my @current;
    while (@current = $result->fetchrow()) {
	for (my $i = 0; $i < scalar(@current); ++$i) {
	    if (! defined($current[$i])) {
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		$current[$i] = "NULL";
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	    }
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	    $current[$i] = uri_escape($current[$i]);
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	}
	print join(" ", @current)."\n";
    }
}

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sub ModifyRow($$)
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{
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    my ($id, $isupdate) = @_;
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    my $query;
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    # XXX
    if ($useScriptFeature && $tabledb eq "new_interfaces") {
	foreach my $key (keys(%args)) {
	    if ($key =~ /^switch/ && defined($args{$key})) {
		$errors{$tableid} =
		    "Should add to wires table to set switch info";
		return;
	    }
	}
    } elsif (!$useScriptFeature && $tabledb eq "new_wires") {
	$errors{$tableid} =
	    "Should add to interfaces table to set switch info";
	return;
    }

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    my $none_changed = 1;
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    if ($isupdate) {
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	$query = "UPDATE";
    } else {
	$query = "INSERT";
    }
    $query .= " $tabledb SET";
    foreach $key (keys(%args)) {
	my $value = $args{$key};
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	if ($key ne "table" && $key ne "command"
	    && (! $isupdate || $key ne $tableid)
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	    && defined($value)) {
	    if ($query ne "UPDATE $tabledb SET"
		&& $query ne "INSERT $tabledb SET") {
		$query .= ",";
	    }
	    $query .= " $key='$value'";
	    $none_changed = 0;
	}
    }
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    if ($isupdate) {
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	$query .= " WHERE $tableid='$id'";
    }
    if ($none_changed == 1) {
	$errors{$tableid} = "At least one field must be specified to update ".
	    "or add";
    } else {
	if ($fake) {
	    print $query."\n";
	} else {
	    DBQueryFatal($query);
	}
    }
}

sub RemoveRow($)
{
    my ($id) = @_;
    my $query = "DELETE FROM $tabledb WHERE $tableid='$id'";
    if ($fake) {
	print $query."\n";
    } else {
	DBQueryFatal($query);
    }
}

sub ResolveRow($)
{
    my ($id) = @_;
    my $query = "SELECT ";
    if ($table eq "node") {
	$query .= 
	    "new_node_id, node_id, type, IP, " .
	    "DATE_FORMAT(created,'%M %e %H:%i:%s') as created, dmesg, " .
	    "identifier, building";
    } elsif ($table eq "interface") {
	$query .= "new_interface_id, new_node_id, card, port, mac, interface_type";
    } elsif ($table eq "wire") {
	$query .= "new_wire_id, cable, len, type, node_id1, card1, port1, " .
	    "node_id2, card2, port2";
    } elsif ($table eq "interface_type") {
	$query .= "new_interface_type_id, type, max_speed, full_duplex, " .
	    "manufacturer, model, ports, connector";
    } else {
	$query .= " *";
    }
    $query .= " FROM $tabledb";
    if (defined($id)) {
	$query .= " WHERE $tableid='$id'";
    } else {
	$query .= " ORDER BY $tableid";
    }
    if ($fake) {
	print $query."\n";
    }
    return DBQueryFatal($query);
}


sub CommitNode($)
{
    my ($id) = @_;
    my $result = ResolveRow($id);
    while (my ($skip, $nodeid) = $result->fetchrow()) {
	my $command = "$TB/sbin/newnode -f $nodeid";
	if ($fake) {
	    print $command."\n";
	} else {
	    system($command);
	}
    }
}

sub CommitInterface($)
{
    $errors{"command"} = "Interfaces cannot be committed individually. ".
	"Commit the node that they belong to.";
}

sub CommitWire
{
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    if (!$useScriptFeature) {
	$errors{"command"} = "Wires cannot be committed individually. ".
	    "Commit the node that they belong to.";
	return;
    }
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    my ($id) = @_;
    my $result = ResolveRow($id);
    while (my ($skip, $cable, $len, $type, $node_id1, $card1, $port1,
	       $node_id2, $card2, $port2) = $result->fetchrow()) {
	my $query = "INSERT wires SET ".
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	    "len='$len', type='$type', node_id1='$node_id1', ".
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	    "card1='$card1', port1='$port1', node_id2='$node_id2', ".
	    "card2='$card2', port2='$port2'";
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	if (defined($cable)) {
	    $query .= ", cable='$cable'";
	}
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	if ($fake) {
	    print $query."\n";
	} else {
	    DBQueryFatal($query);
	}
    }
    RemoveRow($id);
}

sub CommitInterfaceType($)
{
    my ($id) = @_;
    my $result= ResolveRow($id);
    while (my ($skip, $type, $max_speed, $full_duplex, $manufacturer, $model,
	       $ports, $connector) = $result->fetchrow()) {
	my $query = "INSERT interface_types SET ".
	    "type='$type', max_speed='$max_speed', full_duplex='$full_duplex', ".
	    "manufacturer='$manufacturer', model='$model', ports='$ports', ".
	    "connector='$connector'";
	if ($fake) {
	    print $query."\n";
	} else {
	    DBQueryFatal($query);
	}
    }
    RemoveRow($id);
}