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IcculusFinger_daemon.pl
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IcculusFinger_daemon.pl
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#!/usr/bin/perl -w -T
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#-----------------------------------------------------------------------------
#
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# Copyright (C) 2002 Ryan C. Gordon (icculus@icculus.org)
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#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Revision history:
# (1.0 series comments removed. Check the download archives if you need them.)
# 2.0.0 : Rewrite into an actual finger daemon. MILLIONS of changes.
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# 2.0.1 : Fixed > and < conversion.
# MUCH better Lynx support (thanks, Chunky_Ks)
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# Added an "embed" arg.
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# changed \r and \n in protocol chatter to \015 and \012.
# Made syslogging optional.
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# Added "root" as a fakeuser.
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# 2.0.2 : Added "time" and "ipaddr" fakeusers.
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# 2.0.3 : Added "linkdigest" arg, and made it the default for text output.
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# 2.0.4 : Added "noarchive" tagblocks and optional "plan written on"
# date/time output.
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# 2.0.5 : Can now run as a full daemon, without inetd. Bunch of secutity
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# cleanups, and enables taint mode (-T). Input can now timeout, so
# connections can't be hogged indefinitely anymore.
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#-----------------------------------------------------------------------------
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# !!! TODO: Let [img] tags nest inside [link] tags.
# !!! TODO: Make [center] tags attempt to format plain text.
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use strict; # don't touch this line, nootch.
use warnings; # don't touch this line, either.
use DBI; # or this. I guess. Maybe.
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# Version of IcculusFinger. Change this if you are forking the code.
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my $version = "v2.0.5";
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#-----------------------------------------------------------------------------#
# CONFIGURATION VARIABLES: Change to suit your needs... #
#-----------------------------------------------------------------------------#
# This is a the hostname you want to claim to be...
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# This reports "Finger info for $user\@$host ..." in the web interface,
# and is used for listing finger requests to finger clients:
# "Finger $user?section=sectionname\@$host", etc.
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my $host = 'icculus.org';
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# This is the URL for fingering accounts, for when we need to generate
# URLs. "$url?user=$user§ion=sectionname".
my $base_url = 'http://icculus.org/cgi-bin/finger/finger.pl';
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# The processes path is replaced with this string, for security reasons, and
# to satisfy the requirements of Taint mode. Make this as simple as possible.
# Currently, the only thing that uses the PATH environment var is the
# "fortune" fakeuser, which can be safely removed.
my $safe_path = '/usr/bin:/usr/local/bin';
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# Turn the process into a daemon. This will handle creating/answering socket
# connections, and forking off children to handle them. This flag can be
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# toggled via command line options (--daemonize, --no-daemonize, -d), but
# this sets the default. Daemonizing tends to speed up processing (since the
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# script stays loaded/compiled), but may cause problems on systems that
# don't have a functional fork() or IO::Socket::INET package. If you don't
# daemonize, this program reads requests from stdin and writes results to
# stdout, which makes it suitable for command line use or execution from
# inetd and equivalents.
my $daemonize = 0;
# This is only used when daemonized. Specify the port on which to listen for
# incoming connections. The RFC standard finger port is 79.
my $server_port = 79;
# Set this to immediately drop priveledges by setting uid and gid to these
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# values. Set to undef to not attempt to drop privs. You will probably need
# to leave these as undef and run as root (risky!) if you plan to enable
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# $the use_homedir variable, below.
#my $wanted_uid = undef;
#my $wanted_gid = undef;
my $wanted_uid = 1056; # (This is the uid of "finger" ON _MY_ SYSTEM.)
my $wanted_gid = 971; # (This is the gid of "iccfinger" ON _MY_ SYSTEM.)
# This is only used when daemonized. Specify the maximum number of finger
# requests to service at once. A separate child process is fork()ed off for
# each request, and if there are more requests then this value, the extra
# clients will be made to wait until some of the current requests are
# serviced. 5 to 10 is usually a good number. Set it higher if you get a
# massive amount of finger requests simultaneously.
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my $max_connects = 10;
# This is how long, in seconds, before an idle connection will be summarily
# dropped. This prevents abuse from people hogging a connection without
# actually sending a request, without this, enough connections like this
# will block legitimate ones. At worst, they can only block for this long
# before being booted and thus freeing their connection slot for the next
# guy in line. Setting this to undef lets people sit forever, but removes
# reliance on the IO::Select package. Note that this timeout is how long
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# the user has to complete the read_request() function, so don't set it so
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# low that legitimate lag can kill them. The default is usually safe.
my $read_timeout = 15;
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# Set this to non-zero to log all finger requests via the standard Unix
# syslog facility (requires Sys::Syslog qw(:DEFAULT setlogsock) ...)
my $use_syslog = 1;
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# Set $use_homedir to something nonzero if want to read planfiles from the
# standard Unix location ("/home/$user/.plan"). Note that this is a security
# hole, as it means that either IcculusFinger must run as root to insure
# access to a user's homedir, or user's have to surrender a little more
# privacy to give a non-root user access to their homedirs. You should
# consider setting this to zero and reading the comments for $fingerspace,
# below. Note that IcculusFinger comes with a perl script for automating the
# moving of a system's planfiles from the the insecure method to the more
# secure $fingerspace method, including creating the symlinks so your users
# won't really notice a difference.
my $use_homedir = 0;
# If you set $use_homedir to 0, this is the directory that contains the
# planfiles in the format "$fingerdir$username" Note that THIS MUST HAVE
# THE TRAILING DIR SEPARATOR! This is ignored if $use_homedir is NOT zero.
my $fingerspace = '/fingerspace/';
# This is the maximum amount of data that IcculusFinger will read from a
# planfile. If this cuts off in the middle of an opened formatting tag,
# tough luck. IcculusFinger reads the entire planfile (up to the max you
# specify here) into memory before processing tags. Theoretically, this could
# be changed to handle tags on the fly, in which case users that would
# otherwise be over the limit might not be after processing sections, etc,
# but this is not the case here and now.
# Note that images specified inside [img] tags, etc are not counted towards
# this limit (since the web browser would be requesting those images
# separately), and only applies to the max bytes to be read directly from the
# planfile. This is merely here to prevent someone from symlinking their
# planfile to /dev/zero or something that could fill all available memory.
# This value is specified in bytes.
my $max_plan_size = (100 * 1024);
# This is the maximum size, in bytes, that a finger request can be. This is
# to prevent malicious finger clients from trying to fill all of system
# memory.
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my $max_request_size = 512;
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# This is what is reported to the finger client if the desired user's planfile
# is missing or empty, or the user is unknown (we make NO distinction, for
# the sake of security and privacy). This string can use IcculusFinger
# markup tags (we'll convert as appropriate), but must NOT use HTML directly,
# since it will confuse the regular finger client users. You should not
# leave this blank or undef it, since that's confusing for everyone.
my $no_report_string = "[center][i]Nothing to report.[/i][/center]";
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# List at the bottom of the finger output (above wittyremark) when the .plan
# was last updated?
my $show_revision_date = 1;
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# This is the default title for the webpage. The user can override it with
# the [title] tag in their .plan file. Do not use HTML. You can specify an
# empty string (""), but not undef; however, you should REALLY have a
# default here...
my $title = "IcculusFinger $version";
# Alternately, you can populate this array with strings, and IcculusFinger
# will randomly pick one at runtime. Note that the user's [title] tags also
# land in here, so you are interfering with their ability to override the
# title if you add to this array. The $title variable above is used only if
# this array is empty, and thus gives you a comfortable default in case the
# user doesn't supply her own title. Do as you will.
my @title_array;
# If you are a content-Nazi, you can prevent the user's [title] tags from
# being included in the parsing.
my $permit_user_titles = 1;
# This is printed after the credits at the bottom. Change it to whatever you
# like. Do not use HTML. You can specify an empty string (""), but undef
# doesn't fly here. The user can change this with [wittyremark] tags.
my $wittyremark = "Stick it in the camel and go.";
# Alternately, you can populate this array with strings, and IcculusFinger
# will randomly pick one at runtime. Note that the user's [wittyremark] tags
# also land in here, so you are interfering with their ability to override
# if you add to this array. The $wittyremark variable above is used only if
# this array is empty, and thus gives you a comfortable default in case the
# user doesn't supply her own content. Do as you will.
my @wittyremark_array;
# If you are a content-Nazi, you can prevent the user's [wittyremark] tags
# from being included in the parsing.
my $permit_user_wittyremarks = 1;
# You can screw up your output with this, if you like.
# You can append "?debug=1" to your finger request to enable this without
# changing the source.
my $debug = 0;
# This is the URL to where the script can be obtained. Feel free to change
# it if you you are forking the code, but unless you've got a good reason,
# I'd appreciate it if you'd leave my (ahem) official IcculusFinger webpage
# in this variable. Set it to undef to not supply a link at all in the
# final HTML output.
#my $scripturl = undef;
#my $scripturl = "/misc/finger.pl";
my $scripturl = "http://icculus.org/IcculusFinger/";
# This is only used in the HTML-formatted output.
# I'd prefer you leave this be, but change it if you must.
my $html_credits = (defined $scripturl) ?
"Powered by <a href=\"$scripturl\">IcculusFinger $version</a>" :
"Powered by IcculusFinger $version" ;
# This is only used in the plaintext-formatted output.
# I'd prefer you leave this be, but change it if you must.
my $text_credits = "Powered by IcculusFinger $version" .
((defined $scripturl) ? " ($scripturl)" : "");
# Set this to zero to disable planfile archive lookups.
my $use_database = 1;
# This is the host to connect to for database access.
my $dbhost = 'localhost';
# This is the username for the database connection.
my $dbuser = 'fingermgr';
# The database password can be entered in three ways: Either hardcode it into
# $dbpass, (which is a security risk, but is faster if you have a completely
# closed system), or leave $dbpass set to undef, in which case this script
# will try to read the password from the file specified in $dbpassfile (which
# means that this script and the database can be touched by anyone with read
# access to that file), or leave both undef to have DBI get the password from
# the DBI_PASS environment variable, which is the most secure, but least
# convenient.
my $dbpass = undef;
my $dbpassfile = '/etc/IcculusFinger_dbpass.txt';
# The name of the database to use once connected to the database server.
my $dbname = 'IcculusFinger';
# The name of the table inside the database we're using.
my $dbtable_archive = 'finger_archive';
# These are special finger accounts; when a user queries for this fake
# user, we hand back the string returned from the attached function as if
# it was the contents of a planfile. Be careful with this, as it opens up
# potential security holes.
# These subs do NOT have a maximum size limit imposed by the
# $max_plan_size setting, above.
# This hash is checked before actual planfiles, so you can override an
# existing user through this mechanism.
my %fakeusers; # the hash has to exist; don't comment this line.
$fakeusers{'fortune'} = sub {
return(`/usr/games/fortune`);
};
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$fakeusers{'root'} = sub {
return("ph34r me, for i am root. I'm l33t as kittens.");
};
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$fakeusers{'time'} = sub {
return("At the sound of the beep, it will be: " . scalar localtime() .
"\012\012\012\012 ...[b][i][u]BEEP.[/u][/i][/b]");
};
# This works if run from qmail's tcp-env, and not tcpd.
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# also note that this is pretty useless for hits through the web
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# interface, since the webserver's IP will be reported, not the
# browser's IP.
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$fakeusers{'ipaddr'} = sub {
if (defined $ENV{'TCPREMOTEIP'}) {
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return("Your IP address appears to be $ENV{'TCPREMOTEIP'}");
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} else {
return(undef);
}
};
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#-----------------------------------------------------------------------------#
# The rest is probably okay without you laying yer dirty mits on it. #
#-----------------------------------------------------------------------------#
my $is_web_interface = 0;
my $do_html_formatting = 0;
my $browser = "";
my $wanted_section = undef;
my $output_text = "";
my $archive_date = undef;
my $archive_time = undef;
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my $list_sections = 0;
my $list_archives = 0;
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my $embed = 0;
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my $do_link_digest = undef;
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my $did_output_start = 0;
sub output_start {
my ($user, $host) = @_;
return if ((not $is_web_interface) and (not $do_html_formatting));
return if $did_output_start;
$did_output_start = 1;
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print <<__EOF__ if not $embed;
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<html>
<head>
<title> $title </title>
</head>
<body>
<center><h1>Finger info for $user\@$host...</h1></center>
<hr>
__EOF__
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print "\n<pre>\n" if ($browser !~ /Lynx/);
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}
sub output_ending {
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if (($is_web_interface) or ($do_html_formatting) and ($browser !~ /Lynx/)) {
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print(" </pre>\n");
}
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return if $embed;
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my $revision = undef;
if (($show_revision_date) and (defined $archive_date)) {
$revision = "When this .plan was written: $archive_date";
}
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if ($do_html_formatting) {
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$revision = ((defined $revision) ? "$revision<br>\n" : '');
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print <<__EOF__;
<hr>
<center>
<font size="-3">
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$revision
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$html_credits<br>
<i>$wittyremark</i>
</font>
</center>
__EOF__
} else {
# !!! FIXME : Make that ------ line fit the length of the strings.
print "-------------------------------------------------------------------------\n";
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print "$revision\n" if (defined $revision);
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print "$text_credits\n";
print "$wittyremark\n\n";
}
if (($is_web_interface) or ($do_html_formatting)) {
print(" </body>\n");
print("</html>\n");
print("\n");
}
}
sub parse_args {
my $args = shift;
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if ((defined $args) and ($args ne '')) {
$args =~ s/\A\?//;
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if ($args =~ s/(\A|&)web=(.*?)(&|\Z)/$1/) {
$is_web_interface = $2;
}
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if ($args =~ s/(\A|&)html=(.*?)(&|\Z)/$1/) {
$do_html_formatting = $2;
}
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if ($args =~ s/(\A|&)browser=(.*?)(&|\Z)/$1/) {
$browser = $2;
}
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if ($args =~ s/(\A|&)debug=(.*?)(&|\Z)/$1/) {
$debug = $2;
}
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if ($args =~ s/(\A|&)section=(.*?)(&|\Z)/$1/) {
$wanted_section = $2;
$wanted_section =~ tr/A-Z/a-z/;
}
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if ($args =~ s/(\A|&)date=(.*?)(&|\Z)/$1/) {
$archive_date = $2;
}
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if ($args =~ s/(\A|&)time=(.*?)(&|\Z)/$1/) {
$archive_time = $2;
}
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if ($args =~ s/(\A|&)listsections=(.*?)(&|\Z)/$1/) {
$list_sections = $2;
}
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if ($args =~ s/(\A|&)listarchives=(.*?)(&|\Z)/$1/) {
$list_archives = $2;
}
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if ($args =~ s/(\A|&)embed=(.*?)(&|\Z)/$1/) {
$embed = $2;
}
if ($args =~ s/(\A|&)linkdigest=(.*?)(&|\Z)/$1/) {
$do_link_digest = $2;
}
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}
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# default behaviours that depend on output target...
$do_link_digest = !$do_html_formatting if (not defined $do_link_digest);
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return($args);
}
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sub get_sqldate {
my $mtime = shift;
my @t = localtime($mtime);
$t[5] = "0000" . ($t[5] + 1900);
$t[5] =~ s/.*?(\d\d\d\d)\Z/$1/;
$t[4] = "00" . ($t[4] + 1);
$t[4] =~ s/.*?(\d\d)\Z/$1/;
$t[3] = "00" . $t[3];
$t[3] =~ s/.*?(\d\d)\Z/$1/;
$t[2] = "00" . $t[2];
$t[2] =~ s/.*?(\d\d)\Z/$1/;
$t[1] = "00" . $t[1];
$t[1] =~ s/.*?(\d\d)\Z/$1/;
$t[0] = "00" . $t[0];
$t[0] =~ s/.*?(\d\d)\Z/$1/;
return('' . ($t[5]) . '-' . ($t[4]) . '-' . ($t[3]) . ' ' .
($t[2]) . ':' . ($t[1]) . ':' . ($t[0]));
}
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sub get_database_link {
if (not defined $dbpass) {
if (defined $dbpassfile) {
open(FH, $dbpassfile) or return("failed to open $dbpassfile: $!\n");
$dbpass = <FH>;
chomp($dbpass);
$dbpass =~ s/\A\s*//;
$dbpass =~ s/\s*\Z//;
close(FH);
}
}
my $dsn = "DBI:mysql:database=$dbname;host=$dbhost";
$_[0] = DBI->connect($dsn, $dbuser, $dbpass) or
return(DBI::errstr);
return(undef);
}
sub load_archive_list {
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my $user = shift;
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my $link;
my $err = get_database_link($link);
return($err) if defined $err;
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my $u = $link->quote($user);
my $sql = "select postdate from $dbtable_archive where username=$u" .
" order by postdate desc";
my $sth = $link->prepare($sql);
if (not $sth->execute()) {
$link->disconnect();
return "can't execute the query: $sth->errstr";
}
my @archivelist;
while (my @row = $sth->fetchrow_array()) {
push @archivelist, $row[0];
}
if ($#archivelist < 0) {
$output_text = ''; # will use $no_report_string.
} else {
$output_text = "Available archives:\n";
foreach (@archivelist) {
my ($d, $t) = /(\d\d\d\d-\d\d-\d\d) (\d\d:\d\d:\d\d)/;
$t =~ s/(..):(..):(..)/$1-$2-$3/;
if ($do_html_formatting) {
my $url = "$base_url?user=$user&date=$d&time=$t";
$output_text .= " \[link=\"$url\"\]$_\[/link\]\n";
} else {
$output_text .= " finger $user\@$host?&date=$d&time=$t\n";
}
}
}
$sth->finish();
$link->disconnect();
return(undef);
}
sub load_archive {
my $user = shift;
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my $sqldate;
if (defined $archive_date) {
if ($archive_date =~ /\A\d\d\d\d-\d\d-\d\d\Z/) {
$sqldate = $archive_date;
} else {
return("Archive date must be in yyyy-mm-dd format.");
}
} else {
my @t = localtime(time());
$t[5] = "0000" . ($t[5] + 1900);
$t[5] =~ s/.*?(\d\d\d\d)\Z/$1/;
$t[4] = "00" . ($t[4] + 1);
$t[4] =~ s/.*?(\d\d)\Z/$1/;
$t[3] = "00" . $t[3];
$t[3] =~ s/.*?(\d\d)\Z/$1/;
$sqldate = '' . ($t[5]) . '-' . ($t[4]) . '-' . ($t[3]);
}
if (defined $archive_time) {
if ($archive_time =~ /\A(\d\d)-(\d\d)-(\d\d)\Z/) {
$sqldate .= " $1:$2:$3";
} else {
return("Archive date must be in hh-mm-ss format.");
}
} else {
$sqldate .= " 23:59:59"; # end of day.
}
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my $link;
my $err = get_database_link($link);
return($err) if defined $err;
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my $u = $link->quote($user);
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my $sql = "select postdate, text from $dbtable_archive where username=$u" .
" and postdate<='$sqldate' order by postdate desc limit 1";
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my $sth = $link->prepare($sql);
if (not $sth->execute()) {
$link->disconnect();
return "can't execute the query: $sth->errstr";
}
my @row = $sth->fetchrow_array();
if (not @row) {
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$output_text = ''; # will use $no_report_string.
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} else {
$row[1] =~ s/(\A.{0, $max_plan_size}).*\Z/$1/s;
$archive_date = $row[0];
$output_text = $row[1];
}
$sth->finish();
$link->disconnect();
return(undef);
}
sub load_file {
my $user = shift;
my $fname = ($use_homedir) ? "/home/$user/.plan" : "$fingerspace$user";
my $errormsg = undef;
if (not -f "$fname") { # this is NOT an error.
$output_text = "";
} else {
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my $modtime = (stat($fname))[9];
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if (not open(FINGER, '<', "$fname")) {
$errormsg = "Couldn't open planfile: $!";
} else {
if (not defined read(FINGER, $output_text, $max_plan_size)) {
$errormsg = "Couldn't read planfile: $!";
}
close(FINGER);
}
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$archive_date = get_sqldate($modtime);
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}
return($errormsg);
}
sub verify_and_load_request {
my ($args, $user) = @_;
my $errormsg = undef;
if ((defined $args) and ($args ne '')) {
$errormsg = "Unrecognized query arguments: \"$args\"";
} elsif (not defined $user) {
$errormsg = "No user specified.";
} elsif ($user =~ /\@/) {
$errormsg = "Finger request forwarding is forbidden.";
} elsif (length($user) > 20) {
# The 20 char limit is just for safety against potential buffer overflows
# in finger servers, but it's more or less arbitrary.
# !!! TODO FIXME: Check for bogus characters in username/host.
$errormsg = "Bogus user specified.";
} else {
if (defined $fakeusers{$user}) {
$output_text = $fakeusers{$user}->();
}
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elsif ($list_archives) {
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$errormsg = load_archive_list($user);
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}
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elsif ((defined $archive_date) or (defined $archive_time)) {
$errormsg = load_archive($user);
} else {
$errormsg = load_file($user);
}
}
if (defined $errormsg) {
output_start($user, $host);
print " <center><h1>" if $do_html_formatting;
print "$errormsg";
print "</h1></center>" if $do_html_formatting;
print "\n";
output_ending();
return(0);
}
return(1);
}
sub do_fingering {
my ($query_string, $user) = @_;
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my @link_digest;
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if ($debug) {
$title = "debugging...";
output_start($user, $host);
print("WARNING: Debug output is enabled in this finger request!\n");
print("Original query string: \"$query_string\"\n");
print("fingering $user ...\n");
print("HTML formatting: $do_html_formatting ...\n");
print("Is web interface: $is_web_interface ...\n");
print("Browser: $browser ...\n");
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print("Embedding: $embed ...\n");
print("Doing link digest: $do_link_digest ...\n");
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}
if ((not defined $output_text) or ($output_text eq "")) {
$output_text = $no_report_string;
}
# Change [title][/title] tags.
while ($output_text =~ s/\[title\](.*?)\[\/title\](\r\n|\n|\b)//is) {
push @title_array, $1 if $permit_user_titles;
}
# Change [wittyremark][/wittyremark] tags.
while ($output_text =~ s/\[wittyremark\](.*?)\[\/wittyremark\](\r\n|\n|\b)//is) {
push @wittyremark_array, $1 if $permit_user_wittyremarks;
}
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# !!! FIXME: Make this a separate subroutine?
if ($list_sections) {
my @sectionlist;
while ($output_text =~ s/\[section=\"(.*?)\"\](\r\n|\n|\b)(.*?)\[\/section\](\r\n|\n|\b)/$3/is) {
push @sectionlist, $1;
}
$output_text = "Available sections:\n";
if ($do_html_formatting) {
foreach (@sectionlist) {
my $url = "$base_url?user=$user§ion=$_";
$output_text .= " \[link=\"$url\"\]$_\[/link\]\n";
}
} else {
foreach (@sectionlist) {
$output_text .= " finger $user\@$host?section=$_\n";
}
}
}
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# Select a section.
while ($output_text =~ s/\[defaultsection=\"(\w*)\"\](\r\n|\n|\b)//) {
$wanted_section = $1 if (not defined $wanted_section);
}
if (defined $wanted_section) {
print("Using specific section: $wanted_section ...\n") if $debug;
# !!! FIXME: Why isn't the substitution working? I need to assign $2 directly for some reason...
if ($output_text =~ s/\[section=\"$wanted_section\"\](\r\n|\n|\b)(.*?)\[\/section\](\r\n|\n|\b)/$2/is) {
$output_text = $2;
} else {
$output_text = "section \"$wanted_section\" not found.\n";
}
} else {
1 while ($output_text =~ s/\[section=\".*?\"\](.*?)\[\/section\](\r\n|\n|\b)/$1/is);
}
if (($do_html_formatting) or ($is_web_interface)) {
# HTMLify some characters...
1 while ($output_text =~ s/</</s);
1 while ($output_text =~ s/>/>/s);
}
# Change [b][/b] tags.
if ($do_html_formatting) {
1 while ($output_text =~ s/\[b](.*?)\[\/b\]/<b>$1<\/b>/is);
} else {
1 while ($output_text =~ s/\[b](.*?)\[\/b\]/$1/is);
}
# Change [i][/i] tags.
if ($do_html_formatting) {
1 while ($output_text =~ s/\[i](.*?)\[\/i\]/<i>$1<\/i>/is);
} else {
1 while ($output_text =~ s/\[i](.*?)\[\/i\]/$1/is);
}
# Change [u][/u] tags.
if ($do_html_formatting) {
1 while ($output_text =~ s/\[u](.*?)\[\/u\]/<u>$1<\/u>/is);
} else {
1 while ($output_text =~ s/\[u](.*?)\[\/u\]/$1/is);
}
# Change [center][/center] tags.
if ($do_html_formatting) {
if ($browser =~ /Opera/) {
while ($output_text =~ /\[center](.*?)\[\/center\]/is) {
my $buf = $1;
1 while ($buf =~ s/\n/<br>/s);
$output_text =~ s/\[center](.*?)\[\/center\]/<\/pre><center><code>$buf<\/code><\/center><pre>/is;
}
} else {
1 while ($output_text =~ s/\[center](.*?)\[\/center\]/<center>$1<\/center>/is);
}
} else {
1 while ($output_text =~ s/\[center](.*?)\[\/center\]/$1/is);
}
# Change [font][/font] tags.
if ($do_html_formatting) {
1 while ($output_text =~ s/\[font (.*?)](.*?)\[\/font\]/<font $1>$2<\/font>/is);
} else {
1 while ($output_text =~ s/\[font (.*?)](.*?)\[\/font\]/$2/is);
}
# Change [link][/link] tags.
if ($do_html_formatting) {
1 while ($output_text =~ s/\[link=\"(.*?)\"\](.*?)\[\/link\]/<a href=\"$1\">$2<\/a>/is);
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} elsif ($do_link_digest) {
my $x = $#link_digest + 2; # start at one.
while ($output_text =~ s/\[link=\"(.*?)\"\](.*?)\[\/link\]/$2 \[$x\]/is) {
push @link_digest, $1;
$x++;
}
} else { # ugly-ass text output.
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1 while ($output_text =~ s/\[link=\"(.*?)\"\](.*?)\[\/link\]/$2 \[$1\]/is);
}
# Change [img][/img] tags.
if ($do_html_formatting) {
1 while ($output_text =~ s/\[img=\"(.*?)\"\](.*?)\[\/img\]/<img src=\"$1\" alt=\"$2\">/is);
} else {
1 while ($output_text =~ s/\[img=\"(.*?)\"\](.*?)\[\/img\]/$2/is);
}
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# Ditch [noarchive][/noarchive] tags ... those are metadata.
1 while ($output_text =~ s/\[noarchive](.*?)\[\/noarchive\]/$1/is);
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if ($do_html_formatting) {
# try to make URLs into hyperlinks in the HTML output.
1 while ($output_text =~ s/(?<!href=")(?<!src=")(?<!">)\b([a-zA-Z]+?:\/\/[-~=\w&\.\/?]+)/<a href="$1">$1<\/a>/);
# try to make email addresses into hyperlinks in the HTML output.
1 while ($output_text =~ s/\b(?<!href="mailto:)(?<!">)\b([\w\.]+?\@[\w\.]+)(\b|\.)/<a href=\"mailto:$1\">$1<\/a>/);
# HTMLify newlines.
#1 while ($output_text =~ s/\r//s);
#1 while ($output_text =~ s/(?<!<br>)\n/<br>\n/s);
}
# this has to be done after any possible URL detection...
# convert ampersands for the browser.
if (($do_html_formatting) or ($is_web_interface)) {
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1 while ($output_text =~ s/(?<!">)\&(?!lt)(?!gt)(?!amp)/&/s);
}
if ($do_html_formatting and ($browser =~ /Lynx/)) {
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# !!! FIXME: executable regexps suck.
# !!! FIXME: This doesn't work very well.
1 while ($output_text =~ s/^( +)/" " x length($1)/mse);
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1 while ($output_text =~ s/\r//s);
1 while ($output_text =~ s/\n/<br>/s);
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}
if ($#title_array >= 0) {
$title = $title_array[int(rand($#title_array + 1))];
}
if ($#wittyremark_array >= 0) {
$wittyremark = $wittyremark_array[int(rand($#wittyremark_array + 1))];
}
# Pick a random title...
if ($debug) {
my $x;
$x = $#title_array + 1;
print("Number of titles: $x ...\n");
print(" titles:\n");
foreach (@title_array) {
print(" - [$_]\n");
}
print("Chosen: [$title].\n");
$x = $#wittyremark_array + 1;
print("Number of witty remarks: $x ...\n");
print(" witty remarks:\n");
foreach (@wittyremark_array) {
print(" - [$_]\n");
}
print("Chosen: [$wittyremark].\n");
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$x = $#link_digest + 1;
print("Items in link digest: $x ... \n");
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print("\n");
print("Actual finger output begins below line...\n");
print("---------------------------------------------------\n");
}
if ((not $do_html_formatting) and (not $is_web_interface)) {
$output_text = "$title\n\n" . $output_text;
}
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if (($do_link_digest) and ($#link_digest >= 0)) {
$output_text .= "\n\n";
my $idx = 0;
foreach (@link_digest) {
$idx++; # start at one.
$output_text .= " [$idx] $_\n";
}
}
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1 while ($output_text =~ s/\A\n//s); # Remove starting newlines.
1 while ($output_text =~ s/\n\Z//s); # Remove trailing newlines.
output_start($user, $host);
print("$output_text\n");
output_ending();
}
sub read_request {
my $retval = '';
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885
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890
891
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my $count = 0;
my $s = undef;
my $elapsed = undef;
my $starttime = undef;
if (defined $read_timeout) {
$s = new IO::Select();
$s->add(fileno(STDIN));
$starttime = time();
$elapsed = 0;
}
while (1) {
if (defined $read_timeout) {
my $ready = scalar($s->can_read($read_timeout - $elapsed));
return undef if (not $ready);
$elapsed = (time() - $starttime);
}
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896
my $ch;
my $rc = sysread(STDIN, $ch, 1);
return undef if ($rc != 1);
897
if ($ch ne "\015") {
898
return($retval) if (($ch eq '') or ($ch eq "\012"));
899
$retval .= $ch;
900
901
$count++;
return($retval) if ($count >= $max_request_size);
902
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904
}
}
905
return(undef); # shouldn't ever hit this.
906
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908
}
909
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911
sub finger_mainline {
my $query_string = read_request();
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915
916
917
918
919
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921
922
my $syslog_text;
if (not defined $query_string) {
$syslog_text = "input timeout on finger request. Dropped client.\n";
print($syslog_text); # tell the client, if they care.
syslog("info", $syslog_text) if ($use_syslog);
} else {
$syslog_text = "finger request: \"$query_string\"\n";
if ($use_syslog) {
syslog("info", $syslog_text) or
die("Couldn't write to syslog: $!\n");
}
923
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926
my ($user, $args) = $query_string =~ /\A(.*?)(\?.*|\b)\Z/;
$user =~ tr/A-Z/a-z/ if defined $user;
$args = parse_args($args);
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if (verify_and_load_request($args, $user)) {
do_fingering($query_string, $user)
}
931
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940
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949
950
951
952
953
954
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956
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}
return(0);
}
sub syslog_and_die {
my $err = shift;
$err .= "\n";
syslog("info", $err) if ($use_syslog);
die($err);
}
sub go_to_background {
use POSIX 'setsid';
chdir('/') or syslog_and_die("Can't chdir to '/': $!");
open STDIN,'/dev/null' or syslog_and_die("Can't read '/dev/null': $!");
open STDOUT,'>/dev/null' or syslog_and_die("Can't write '/dev/null': $!");
defined(my $pid=fork) or syslog_and_die("Can't fork: $!");
exit if $pid;
setsid or syslog_and_die("Can't start new session: $!");
open STDERR,'>&STDOUT' or syslog_and_die("Can't duplicate stdout: $!");
}
sub drop_privileges {
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
959
$ENV{'PATH'} = $safe_path;
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964
$) = $wanted_gid if (defined $wanted_gid);
$> = $wanted_uid if (defined $wanted_uid);
}
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# Mainline.
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if (defined $read_timeout) {
use IO::Select;
}
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foreach (@ARGV) {
$daemonize = 1, next if $_ eq '--daemonize';
$daemonize = 1, next if $_ eq '-d';
$daemonize = 0, next if $_ eq '--no-daemonize';
die("Unknown command line \"$_\".\n");
}
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if ($use_syslog) {
use Sys::Syslog qw(:DEFAULT setlogsock);
setlogsock("unix");
openlog("fingerd", "user") or die("Couldn't open syslog: $!\n");
}
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992
my $retval = 0;
if (not $daemonize) {
drop_privileges();
$retval = finger_mainline();
} else {
go_to_background();
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# reap zombies from client forks...
my $total_kids = 0;
$SIG{CHLD} = sub { wait(); $total_kids--; };
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use IO::Socket::INET;
my $listensock = IO::Socket::INET->new(LocalPort => $server_port,
Type => SOCK_STREAM,
ReuseAddr => 1,