#!/usr/bin/perl
# ipdb/cgi-bin/search.cgi
# Started splitting search functions (quick and otherwise) from
# main IPDB interface 03/11/2005
###
# SVN revision info
# $Date: 2005-09-21 21:58:37 +0000 (Wed, 21 Sep 2005) $
# SVN revision $Rev: 285 $
# Last update by $Author: kdeugau $
###
# Copyright 2005 Kris Deugau <kdeugau@deepnet.cx>

use strict;		
use warnings;	
use CGI::Carp qw(fatalsToBrowser);
use DBI;
use CommonWeb qw(:ALL);
use MyIPDB;
use POSIX qw(ceil);
use NetAddr::IP;

# Don't need a username or syslog here.  syslog left active for debugging.
use Sys::Syslog;
openlog "IPDBsearch","pid","local2";

# Why not a global DB handle?  (And a global statement handle, as well...)
# Use the connectDB function, otherwise we end up confusing ourselves
my $ip_dbh;
my $sth;
my $errstr;
($ip_dbh,$errstr) = connectDB_My;
if (!$ip_dbh) {
  printAndExit("Failed to connect to database: $errstr\n");
}
checkDBSanity($ip_dbh);
initIPDBGlobals($ip_dbh);

# Global variables
my $RESULTS_PER_PAGE = 10;
my %webvar = parse_post();
cleanInput(\%webvar);

if (!defined($webvar{stype})) {
  $webvar{stype} = "<NULL>";   #shuts up the warnings.
}

printHeader('Searching...');

if ($webvar{stype} eq 'q') {
  # Quick search.

  if (!$webvar{input}) {
    # No search term.  Display everything.
    viewBy('all', '');
  } else {
    # Search term entered.  Display matches.
    # We should really sanitize $webvar{input}, no?
    my $searchfor;
    # Chew up leading and trailing whitespace
    $webvar{input} =~ s/^\s+//;
    $webvar{input} =~ s/\s+$//;
    if ($webvar{input} =~ /^\d+$/) {
      # All-digits, new custID
      $searchfor = "cust";
    } elsif ($webvar{input} =~ /^[\d\.]+(\/\d{1,3})?$/) {
      # IP addresses should only have numbers, digits, and maybe a slash+netmask
      $searchfor = "ipblock";
    } else {
      # Anything else.
      $searchfor = "desc";
    }
    viewBy($searchfor, $webvar{input});
  }

} elsif ($webvar{stype} eq 'c') {
  # Complex search.

  # Several major cases, and a whole raft of individual cases.
  # -> Show all types means we do not need to limit records retrieved by type
  # -> Show all cities means we do not need to limit records retrieved by city
  # Individual cases are for the CIDR/IP, CustID, Description, Notes, and individual type
  # requests.

  my $sqlconcat;
  if ($webvar{which} eq 'all') {
    # Must match *all* specified criteria.	## use INTERSECT or EXCEPT
    $sqlconcat = "INTERSECT";
  } elsif ($webvar{which} eq 'any') {
    # Match on any specified criteria		## use UNION
    $sqlconcat = "UNION";
  } else {
    # We can't get here.  PTHBTT!
    printAndExit "PTHBTT!!  Your search has been rejected due to Microsoft excuse #4432: ".
	"Not enough mana";
  }

# We actually construct a monster SQL statement for all criteria.
# Iff something has been entered, it will be used as a filter.
# Iff something has NOT been entered, we still include it but in
# such a way that it does not actually filter anything out.

  # Columns actually returned.  Slightly better than hardcoding it
  # in each (sub)select
  my $cols = "cidr,custid,type,city,description";

  # First chunk of SQL.  Filter on custid, description, and notes as necessary.
  my $sql = "(select $cols from searchme where $webvar{custexclude} custid ilike '%$webvar{custid}%')".
	" $sqlconcat (select $cols from searchme where $webvar{descexclude} description ilike '%$webvar{desc}%')".
	" $sqlconcat (select $cols from searchme where $webvar{notesexclude} notes ilike '%$webvar{notes}%')";

  # If we're not supposed to search for all types, search for the selected types.
  if ($webvar{alltypes} ne 'on') {
    $sql .= " $sqlconcat (select $cols from searchme where $webvar{typeexclude} type in (";
    foreach my $key (keys %webvar) {
      $sql .= "'$1'," if $key =~ /type\[(..)\]/;
    }
    chop $sql;
    $sql .= "))";
  }

  # If we're not supposed to search for all cities, search for the selected cities.
  # This could be vastly improved with proper foreign keys in the database.
  if ($webvar{allcities} ne 'on') {
    $sql .= " $sqlconcat (select $cols from searchme where $webvar{cityexclude} city in (";
    $sth = $ip_dbh->prepare("select city from cities where id=?");
    foreach my $key (keys %webvar) {
      if ($key =~ /city\[(\d+)\]/) {
        $sth->execute($1);
        my $city;
        $sth->bind_columns(\$city);
        $sth->fetch;
        $city =~ s/'/''/;
        $sql .= "'$city',";
      }
    }
    chop $sql;
    $sql .= "))";
  }

  ## CIDR query options.
  $webvar{cidr} =~ s/\s+//;	# Hates the nasty spaceseseses we does.
  if ($webvar{cidr} == '') { # We has a blank CIDR.  Ignore it.
  } elsif ($webvar{cidr} =~ /\//) {
    # 209.91.179/26 should show all /26 subnets in 209.91.179
    my ($net,$maskbits) = split /\//, $webvar{cidr};
    if ($webvar{cidr} =~ /^(\d{1,3}\.){3}\d{1,3}\/\d{2}$/) {
      # /0->/9 are silly to worry about right now.  I don't think
      # we'll be getting a class A anytime soon.  <g>
      $sql .= " $sqlconcat (select $cols from searchme where ".
	"$webvar{cidrexclude} cidr='$webvar{cidr}')";
    } else {
      # Partial match;  beginning of subnet and maskbits are provided
      # Show any blocks with the leading octet(s) and that masklength
      $sql .= " $sqlconcat (select $cols from searchme where $webvar{cidrexclude} ".
	"(text(cidr) like '$net%' and masklen(cidr)=$maskbits))";
    }
  } elsif ($webvar{cidr} =~ /^(\d{1,3}\.){3}\d{1,3}$/) {
    # Specific IP address match.  Will show either a single netblock,
    # or a static pool plus an IP.
    $sql .= " $sqlconcat (select $cols from searchme where $webvar{cidrexclude} ".
	"cidr >>= '$webvar{cidr}')";
  } elsif ($webvar{cidr} =~ /^\d{1,3}(\.(\d{1,3}(\.(\d{1,3}\.?)?)?)?)?$/) {
    # Leading octets in CIDR
    $sql .= " $sqlconcat (select $cols from searchme where $webvar{cidrexclude} ".
	"text(cidr) like '$webvar{cidr}%')";
  } else {
    # This shouldn't happen, but if it does, whoever gets it deserves what they get...
    printAndExit("Invalid netblock query.");
  } # done with CIDR query options.

  # Find the offset for multipage results
  my $offset = ($webvar{page}-1)*$RESULTS_PER_PAGE;

  # Find out how many rows the "core" query will return.
  my $count = countRows($sql);

  if ($count == 0) {
    printError "No matches found.  Try eliminating one of the criteria,".
	" or making one or more criteria more general.";
  } else {
    # Add the limit/offset clauses
    $sql .= " order by cidr limit $RESULTS_PER_PAGE offset $offset";
    # And tell the user.
    print "<div class=heading>Searching...............</div>\n";
    queryResults($sql, $webvar{page}, $count);
  }

} else { # how script was called.  General case is to show the search criteria page.

  # Display search page.  We have to do this here, because otherwise
  # we can't retrieve data from the database for the types and cities.  >:(
  my $html;
  open HTML,"<../compsearch.html";
  $html = join('',<HTML>);
  close HTML;

# Generate table of types
  my $typetable = "<table class=regular cellspacing=0>\n<tr>";
  $sth = $ip_dbh->prepare("select type,dispname from alloctypes where listorder <500 ".
	"order by listorder");
  $sth->execute;
  my $i=0;
  while (my @data = $sth->fetchrow_array) {
    $typetable .= "<td><input type=checkbox name=type[$data[0]]>$data[1]</td>";
    $i++;
    $typetable .= "</tr>\n<tr>"
	if ($i % 4 == 0);
  }
  if ($i %4 == 0) {
    $typetable =~ s/<tr>$//;
  } else {
    $typetable .= "</tr>\n";
  }
  $typetable .= "</table>\n";

# Generate table of cities
  my $citytable = "<table class=regular cellspacing=0>\n<tr>";
  $sth = $ip_dbh->prepare("select id,city from cities order by city");
  $sth->execute;
  my $i=0;
  while (my @data = $sth->fetchrow_array) {
    $citytable .= "<td><input type=checkbox name=city[$data[0]]>$data[1]</td>";
    $i++;
    $citytable .= "</tr>\n<tr>"
	if ($i % 5 == 0);
  }
  if ($i %5 == 0) {
    $citytable =~ s/<tr>$//;
  } else {
    $citytable .= "</tr>\n";
  }
  $citytable .= "</table>\n";

  $html =~ s/\$\$TYPELIST\$\$/$typetable/;
  $html =~ s/\$\$CITYLIST\$\$/$citytable/;

  print $html;
}

# Shut down and clean up.
finish($ip_dbh);
printFooter;
# We shouldn't need to directly execute any code below here;  it's all subroutines.
exit 0;


# viewBy()
# The quick search
# Takes a category descriptor and a query string
# Creates appropriate SQL to run the search and display the results
# with queryResults()
sub viewBy($$) {
  my ($category,$query) = @_;

  # Local variables
  my $sql;

  # Calculate start point for LIMIT clause
  my $offset = ($webvar{page}-1)*$RESULTS_PER_PAGE;

# Possible cases:
# 1) Partial IP/subnet.  Treated as "octet-prefix".
# 2a) CIDR subnet.  Exact match.
# 2b) CIDR netmask.  YMMV but it should be octet-prefix-with-netmask
#	(ie, all matches with the octet prefix *AND* that netmask)
# 3) Customer ID.  "Match-any-segment"
# 4) Description.  "Match-any-segment"
# 5) Invalid data which might be interpretable as an IP or something, but
#    which probably shouldn't be for reasons of sanity.

  if ($category eq 'all') {

    print qq(<div class="heading">Showing all netblock and static-IP allocations</div><br>\n);
    $sql = "select * from searchme";
    my $count = countRows($sql);
    $sql .= " order by cidr limit $RESULTS_PER_PAGE offset $offset";
    queryResults($sql, $webvar{page}, $count);

  } elsif ($category eq 'cust') {

    print qq(<div class="heading">Searching for Customer IDs containing '$query'</div><br>\n);

    # Query for a customer ID.  Note that we can't restrict to "numeric-only"
    # as we have non-numeric custIDs in the legacy data.  :/
    $sql = "select * from searchme where custid ilike '%$query%'";
    my $count = countRows($sql);
    $sql .= " order by cidr limit $RESULTS_PER_PAGE offset $offset";
    queryResults($sql, $webvar{page}, $count);

  } elsif ($category eq 'desc') {

    print qq(<div class="heading">Searching for descriptions containing '$query'</div><br>\n);
    # Query based on description (includes "name" from old DB).
    $sql = "select * from searchme where description ilike '%$query%'".
	" or custid ilike '%$query%'";
    my $count = countRows($sql);
    $sql .= " order by cidr limit $RESULTS_PER_PAGE offset $offset";
    queryResults($sql, $webvar{page}, $count);

  } elsif ($category =~ /ipblock/) {

    # Query is for a partial IP, a CIDR block in some form, or a flat IP.
    print qq(<div class="heading">Searching for IP-based matches on '$query'</div><br>\n);

    $query =~ s/\s+//g;
    if ($query =~ /\//) {
      # 209.91.179/26 should show all /26 subnets in 209.91.179
      my ($net,$maskbits) = split /\//, $query;
      if ($query =~ /^(\d{1,3}\.){3}\d{1,3}\/\d{2}$/) {
	# /0->/9 are silly to worry about right now.  I don't think
	# we'll be getting a class A anytime soon.  <g>
        $sql = "select * from searchme where cidr='$query'";
	queryResults($sql, $webvar{page}, 1);
      } else {
	print "Finding all blocks with netmask /$maskbits, leading octet(s) $net<br>\n";
	# Partial match;  beginning of subnet and maskbits are provided
	$sql = "select * from searchme where text(cidr) like '$net%' and ".
		"text(cidr) like '%$maskbits'";
	my $count = countRows($sql);
	$sql .= " order by cidr limit $RESULTS_PER_PAGE offset $offset";
	queryResults($sql, $webvar{page}, $count);
      }
    } elsif ($query =~ /^(\d{1,3}\.){3}\d{1,3}$/) {
      # Specific IP address match
      print "4-octet pattern found;  finding netblock containing IP $query<br>\n";
      my ($net,$ip) = ($query =~ /(\d{1,3}\.\d{1,3}\.\d{1,3}\.)(\d{1,3})/);
      my $sfor = new NetAddr::IP $query;
      $sth = $ip_dbh->prepare("select * from searchme where text(cidr) like '$net%'");
      $sth->execute;
      while (my @data = $sth->fetchrow_array()) {
        my $cidr = new NetAddr::IP $data[0];
	if ($cidr->contains($sfor)) {
	  queryResults("select * from searchme where cidr='$cidr'", $webvar{page}, 1);
	}
      }
    } elsif ($query =~ /^(\d{1,3}\.){1,3}\d{1,3}\.?$/) {
      print "Finding matches with leading octet(s) $query<br>\n";
      $sql = "select * from searchme where text(cidr) like '$query%'";
      my $count = countRows($sql);
      $sql .= " order by cidr limit $RESULTS_PER_PAGE offset $offset";
      queryResults($sql, $webvar{page}, $count);
    } else {
      # This shouldn't happen, but if it does, whoever gets it deserves what they get...
      printError("Invalid query.");
    }
  } else {
    # This shouldn't happen, but if it does, whoever gets it deserves what they get...
    printError("Invalid searchfor.");
  }
} # viewBy


# args are: a reference to an array with the row to be printed and the 
# class(stylesheet) to use for formatting.
# if ommitting the class - call the sub as &printRow(\@array)
sub printRow {
  my ($rowRef,$class) = @_;

  if (!$class) {
    print "<tr>\n";
  } else {
    print "<tr class=\"$class\">\n";
  }

ELEMENT:  foreach my $element (@$rowRef) {
    if (!defined($element)) {
      print "<td></td>\n";
      next ELEMENT;
    }
    $element =~ s|\n|</br>|g;
    print "<td>$element</td>\n";
  }
  print "</tr>";
} # printRow


# queryResults()
# Display search queries based on the passed SQL.
# Takes SQL, page number (for multipage search results), and a total count.
sub queryResults($$$) {
  my ($sql, $pageNo, $rowCount) = @_;
  my $offset = 0;
  $offset = $1 if($sql =~ m/.*limit\s+(.*),.*/);

  my $sth = $ip_dbh->prepare($sql);
  $sth->execute();

  startTable('Allocation','CustID','Type','City','Description/Name');
  my $count = 0;

  while (my @data = $sth->fetchrow_array) {

    # cidr,custid,type,city,description,notes
    # Another bit of HairyPerl(TM) to prefix subblocks with "Sub"
    my @row = (($data[2] =~ /^.r$/ ? 'Sub ' : '').
	qq(<a href="/ip/cgi-bin/main.cgi?action=edit&block=$data[0]">$data[0]</a>),
	$data[1], $disp_alloctypes{$data[2]}, $data[3], $data[4]);
    # Allow listing of pool if desired/required.
    if ($data[2] =~ /^.[pd]$/) {
      $row[0] .= ' &nbsp; <a href="/ip/cgi-bin/main.cgi?action=listpool'.
	"&pool=$data[0]\">List IPs</a>";
    }
    printRow(\@row, 'color1', 1) if ($count%2==0); 
    printRow(\@row, 'color2', 1) if ($count%2!=0);
    $count++;
  }

  # Have to think on this call, it's primarily to clean up unfetched rows from a select.
  # In this context it's probably a good idea.
  $sth->finish();

  my $upper = $offset+$count;
  print "<tr><td colspan=10 bgcolor=white class=regular>Records found: $rowCount<br><i>Displaying: ".($offset+1)." - $upper</i></td></tr>\n";
  print "</table></center>\n";

  # print the page thing..
  if ($rowCount > $RESULTS_PER_PAGE) {
    my $pages = ceil($rowCount/$RESULTS_PER_PAGE);
    print qq(<div class="center"> Page: );
    for (my $i = 1; $i <= $pages; $i++) {
      if ($i == $pageNo) {
	print "<b>$i&nbsp;</b>\n";
      } else {
	print qq(<a href="/ip/cgi-bin/search.cgi?page=$i&stype=$webvar{stype}&);
	if ($webvar{stype} eq 'c') {
	  print "cidr=$webvar{cidr}&custid=$webvar{custid}&desc=$webvar{desc}&".
		"notes=$webvar{notes}&which=$webvar{which}&alltypes=$webvar{alltypes}&".
		"allcities=$webvar{allcities}&";
	  foreach my $key (keys %webvar) {
	    if ($key =~ /^(?:type|city)\[/) {
	      print "$key=$webvar{$key}&";
	    }
	  }
	} else {
	  print "input=$webvar{input}&";
	}
	print qq(">$i</a>&nbsp;\n);
      }
    }
    print "</div>";
  }
} # queryResults


# Prints table headings.  Accepts any number of arguments;
# each argument is a table heading.
sub startTable {
  print qq(<center><table width="98%" cellspacing="0" class="center"><tr>);

  foreach(@_) {
    print qq(<td class="heading">$_</td>);
  }
  print "</tr>\n";
} # startTable


# Return count of rows to be returned in a "real" query
# with the passed SQL statement
sub countRows($) {
  # Note that the "as foo" is required
  my $sth = $ip_dbh->prepare("select count(*) from ($_[0]) as foo");
  $sth->execute();
  my @a = $sth->fetchrow_array();
  $sth->finish();
  return $a[0];
}