Adding upstream version 2.4.38.upstream/2.4.38upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 225 insertions, 0 deletions

diff --git a/support/logresolve.pl.in b/support/logresolve.pl.in
new file mode 100644
index 0000000..2cd212d
--- /dev/null
+++ b/support/logresolve.pl.in
@@ -0,0 +1,225 @@
+#!@perlbin@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+# logresolve.pl
+#
+# v 1.2 by robh imdb.com
+# 
+# usage: logresolve.pl <infile >outfile
+#
+# input = Apache/NCSA/.. logfile with IP numbers at start of lines
+# output = same logfile with IP addresses resolved to hostnames where
+#  name lookups succeeded.
+#
+# this differs from the C based 'logresolve' in that this script
+# spawns a number ($CHILDREN) of subprocesses to resolve addresses
+# concurrently and sets a short timeout ($TIMEOUT) for each lookup in
+# order to keep things moving quickly.
+#
+# the parent process handles caching of IP->hostnames using a Perl hash
+# it also avoids sending the same IP to multiple child processes to be
+# resolved multiple times concurrently.
+#
+# Depending on the settings of $CHILDREN and $TIMEOUT you should see
+# significant reductions in the overall time taken to resolve your
+# logfiles. With $CHILDREN=40 and $TIMEOUT=5 I've seen 200,000 - 300,000
+# logfile lines processed per hour compared to ~45,000 per hour
+# with 'logresolve'.
+#
+# I haven't yet seen any noticeable reduction in the percentage of IPs
+# that fail to get resolved. Your mileage will no doubt vary. 5s is long
+# enough to wait IMO.
+#
+# Known to work with FreeBSD 2.2
+# Known to have problems with Solaris
+#
+# 980417 - use 'sockaddr_un' for bind/connect to make the script work
+#  with linux. Fix from Luuk de Boer <luuk_de_boer pi.net>
+
+require 5.004;
+
+$|=1;
+
+use FileHandle;
+use Socket;
+
+use strict;
+no strict 'refs';
+
+use vars qw($PROTOCOL);
+$PROTOCOL = 0;
+
+my $CHILDREN = 40;
+my $TIMEOUT  = 5;
+
+my $filename;
+my %hash = ();
+my $parent = $$;
+
+my @children = ();
+for (my $child = 1; $child <=$CHILDREN; $child++) {
+	my $f = fork();	
+	if (!$f) {
+		$filename = "./.socket.$parent.$child";
+		if (-e $filename) { unlink($filename) || warn "$filename .. $!\n";}
+		&child($child);
+		exit(0);
+	}
+	push(@children, $f);
+}
+
+&parent;
+&cleanup;
+
+## remove all temporary files before shutting down
+sub cleanup {
+	 # die kiddies, die
+	kill(15, @children);
+	for (my $child = 1; $child <=$CHILDREN; $child++) {
+		if (-e "./.socket.$parent.$child") {
+			unlink("./.socket.$parent.$child")
+				|| warn ".socket.$parent.$child $!";
+		}
+	}
+}
+	
+sub parent {
+	# Trap some possible signals to trigger temp file cleanup
+	$SIG{'KILL'} = $SIG{'INT'} = $SIG{'PIPE'} = \&cleanup;
+
+	my %CHILDSOCK;
+	my $filename;
+ 
+	 ## fork child processes. Each child will create a socket connection
+	 ## to this parent and use an unique temp filename to do so.
+	for (my $child = 1; $child <=$CHILDREN; $child++) {
+		$CHILDSOCK{$child}= FileHandle->new;
+
+		if (!socket($CHILDSOCK{$child}, AF_UNIX, SOCK_STREAM, $PROTOCOL)) {
+			warn "parent socket to child failed $!";
+		}
+		$filename = "./.socket.$parent.$child";
+		my $response;
+		do {
+			$response = connect($CHILDSOCK{$child}, sockaddr_un($filename));
+			if ($response != 1) {
+				sleep(1);
+			}                       
+		} while ($response != 1);
+		$CHILDSOCK{$child}->autoflush;
+	}
+	## All child processes should now be ready or at worst warming up 
+
+	my (@buffer, $child, $ip, $rest, $hostname, $response);
+	 ## read the logfile lines from STDIN
+	while(<STDIN>) {
+		@buffer = ();	# empty the logfile line buffer array.
+		$child = 1;		# children are numbered 1..N, start with #1
+
+		# while we have a child to talk to and data to give it..
+		do {
+			push(@buffer, $_);					# buffer the line
+			($ip, $rest) = split(/ /, $_, 2);	# separate IP form rest
+
+			unless ($hash{$ip}) {				# resolve if unseen IP
+				$CHILDSOCK{$child}->print("$ip\n"); # pass IP to next child
+				$hash{$ip} = $ip;				# don't look it up again.
+				$child++;
+			}
+		} while (($child < ($CHILDREN-1)) and ($_ = <STDIN>));
+
+		 ## now poll each child for a response
+		while (--$child > 0) { 
+			$response = $CHILDSOCK{$child}->getline;
+			chomp($response);
+			 # child sends us back both the IP and HOSTNAME, no need for us
+			 # to remember what child received any given IP, and no worries
+			 # what order we talk to the children
+			($ip, $hostname) = split(/\|/, $response, 2);
+			$hash{$ip} = $hostname;
+		}
+
+		 # resolve all the logfiles lines held in the log buffer array..
+		for (my $line = 0; $line <=$#buffer; $line++) {
+			 # get next buffered line
+			($ip, $rest) = split(/ /, $buffer[$line], 2);
+			 # separate IP from rest and replace with cached hostname
+			printf STDOUT ("%s %s", $hash{$ip}, $rest);
+		}
+	}
+}
+
+########################################
+
+sub child {
+	 # arg = numeric ID - how the parent refers to me
+	my $me = shift;
+
+	 # add trap for alarm signals.
+	$SIG{'ALRM'} = sub { die "alarmed"; };
+
+	 # create a socket to communicate with parent
+	socket(INBOUND, AF_UNIX, SOCK_STREAM, $PROTOCOL)
+		|| die "Error with Socket: !$\n";
+	$filename = "./.socket.$parent.$me";
+	bind(INBOUND, sockaddr_un($filename))
+		|| die "Error Binding $filename: $!\n";
+	listen(INBOUND, 5) || die "Error Listening: $!\n";
+
+	my ($ip, $send_back);
+	my $talk = FileHandle->new;
+
+	 # accept a connection from the parent process. We only ever have
+	 # have one connection where we exchange 1 line of info with the
+	 # parent.. 1 line in (IP address), 1 line out (IP + hostname).
+	accept($talk, INBOUND) || die "Error Accepting: $!\n";
+	 # disable I/O buffering just in case
+	$talk->autoflush;
+	 # while the parent keeps sending data, we keep responding..
+	while(($ip = $talk->getline)) {
+		chomp($ip);
+		 # resolve the IP if time permits and send back what we found..
+		$send_back = sprintf("%s|%s", $ip, &nslookup($ip));
+		$talk->print($send_back."\n");
+	}
+}
+
+# perform a time restricted hostname lookup.
+sub nslookup {
+	 # get the IP as an arg
+	my $ip = shift;
+	my $hostname = undef;
+
+	 # do the hostname lookup inside an eval. The eval will use the
+	 # already configured SIGnal handler and drop out of the {} block
+	 # regardless of whether the alarm occurred or not.
+	eval {
+		alarm($TIMEOUT);
+		$hostname = gethostbyaddr(gethostbyname($ip), AF_INET);
+		alarm(0);
+	};
+	if ($@ =~ /alarm/) {
+		 # useful for debugging perhaps..
+		# print "alarming, isn't it? ($ip)";
+	}
+
+	 # return the hostname or the IP address itself if there is no hostname
+	$hostname ne "" ? $hostname : $ip;
+}
+
+