fetchtar.proxy.in 3.67 KB
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#!/usr/bin/perl -wT

#
# EMULAB-COPYRIGHT
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# Copyright (c) 2003, 2004 University of Utah and the Flux Group.
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# All rights reserved.
#

use English;
use Getopt::Std;
use BSD::Resource;
use POSIX qw(:signal_h);
    
#
# Fetch tarballs and RPMs on behalf of a user
#
sub usage()
{
    print "Usage: $0 -u user URL localfile\n";
 
    exit(-1);
}

#
# Configure variables
#
my $TB       = "@prefix@";
my $TBOPS    = "@TBOPSEMAIL@";
my $FSDIR_PROJ = "@FSDIR_PROJ@";
my $FSDIR_GROUPS = "@FSDIR_GROUPS@";

# Locals
my $WGET = "/usr/local/bin/wget";
my $REALPATH = "/bin/realpath";
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my $CHMOD = "/bin/chmod";
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#
# Turn off line buffering on output
#
$| = 1;

#
# Untaint the path
# 
$ENV{'PATH'} = "/bin:/usr/bin:/sbin:/usr/sbin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

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

#
# First option has to be the -u option, the user to run this script as.
#
if ($UID != 0) {
    die("*** $0:\n".
	"    Must be root to run this script!");
}

if (@ARGV != 4) {
    usage();
}

if ((shift @ARGV) ne '-u') {
    die("*** $0:\n".
	"    Improper first argument. Must be the user name!\n");
}

my $user = shift @ARGV;
my $URL = shift @ARGV;
my $localfile = shift @ARGV;

#
# Check arguments
#
if (!($user =~ /^([\w-]+)$/)) {
    die("*** $0:\n".
	"    Bad username given\n");
} else {
    $user = $1;
}

(undef,undef,$unix_uid) = getpwnam($user) or
    die("*** $0:\n".
	"    No such user $user\n");

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if (!($URL =~
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	/^((http|https|ftp):\/\/[\w.\-\/\@:~]+(\.tar|\.tar\.Z|\.tar\.gz|\.tgz|\.bz2|\.rpm))$/)) {
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    die("*** $0:\n".
	"    Illegal URL given: $URL\n");
} else {
    $URL = $1;
}

if (!($localfile =~ /^([\w\.\_\-+\/]+)$/)) {
    die("*** $0:\n".
	"    Illegal local filename given: $localfile\n");
} else {
    $localfile = $1;
    my $realpath = `$REALPATH $localfile`;
    chomp $realpath;
    if ($realpath !~ /^(($FSDIR_PROJ|$FSDIR_GROUPS)\/.*)$/) {
	die("*** $0:\n".
	    "    Local file must be in /proj or /groups: $localfile, $realpath \n");
    } else {
	$localfile = $1;
    }
}

#
# Need the entire group list for the user, cause of subgroups, and
# cause thats the correct thing to do. Too bad perl does not have a
# getgrouplist function like the C library.
#
my $glist = `id -G $user`;
if ($glist =~ /^([\d ]*)$/) {
    $glist = $1;
}
else {
    die("*** $0:\n".
	"    Unexpected results from 'id -G $user': $glist\n");
}

# Need to split off the first group and create a proper list for $GUID.
my @gglist   = split(" ", $glist);
my $unix_gid = $gglist[0];
$glist       = "$unix_gid $glist";

# Flip to user and never go back!
$GID            = $unix_gid;
$EGID           = $glist;
$EUID = $UID    = $unix_uid;
$ENV{'USER'}    = $user;
$ENV{'LOGNAME'} = $user;

#
# Fork a child process to run the wget
#
my $pid = fork();

if (!defined($pid)) {
    die("*** $0:\n".
	"    Could not fork a new process!");
}

#
# Child does the fetch, niced down, and exits
#
if (! $pid) {
    # Set the CPU limit for us.
    setrlimit(RLIMIT_CPU, 180, 180);
    
    # Give parent a chance to react.
    sleep(1);

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    exec("nice -15 $WGET --timestamping --non-verbose -O $localfile $URL");
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    die("Could not exec wget!\n");
}

#
# Parent waits.
#
waitpid($pid, 0);
my $exit_status = $?;

#
# If the child was KILLed, then it overran its time limit.
# Send email. Otherwise, exit with result of child.
#
if (($exit_status & 0xff) == SIGKILL) {
    my $msg = "wget CPU Limit";

    SENDMAIL($TBOPS, "wget Exceeded CPU Limit", $msg);
    
    print STDERR "$msg\n";
    exit(15);
}

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#
# Change the permissions on the file so that other group members can overwrite
# it
#
system("$CHMOD g+w $localfile")
    or die ("*** ERROR - Unable to change permissions on $localfile!");

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exit($exit_status >> 8);