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Commit 6ad9bd80 authored by Daniel Stenberg's avatar Daniel Stenberg
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crawls through a whole site and verifies links

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#!/usr/bin/perl
#
# crawlink.pl
#
# This script crawls across all found links below the given "root" URL.
# It reports all good and bad links to stdout. This code was based on the
# checklink.pl script I wrote ages ago.
#
# Written to use 'curl' for URL checking.
#
# Author: Daniel Stenberg <daniel@haxx.se>
# Version: 0.1 Dec 14, 2000
#
# HISTORY
#
# 0.1 - The given url works as the root. This script will only continue
# and check other URLs if the leftmost part of the new URL is identical
# to the root URL.
#
use strict;
my $in="";
my $verbose=0;
my $usestdin;
my $linenumber;
my $help;
my $external;
argv:
if($ARGV[0] eq "-v" ) {
$verbose++;
shift @ARGV;
goto argv;
}
elsif($ARGV[0] eq "-l" ) {
$linenumber = 1;
shift @ARGV;
goto argv;
}
elsif($ARGV[0] eq "-h" ) {
$help = 1;
shift @ARGV;
goto argv;
}
elsif($ARGV[0] eq "-x" ) {
$external = 1;
shift @ARGV;
goto argv;
}
my $geturl = $ARGV[0];
my $firsturl= $geturl;
#
# Define a hash array to hold all root URLs to visit/we have visited
#
my %rooturls;
$rooturls{$ARGV[0]}=1;
if(($geturl eq "") || $help) {
print "Usage: $0 [-hilvx] <full URL>\n",
" Use a traling slash for directory URLs!\n",
" -h This help text\n",
" -l Line number report for BAD links\n",
" -v Verbose mode\n",
" -x Check non-local (external?) links only\n";
exit;
}
# This is necessary from where I tried this:
my $proxy="";
#$proxy =" -x 194.237.142.41:80";
# linkchecker, URL will be appended to the right of this command line
# this is the one using HEAD:
my $linkcheck = "curl -s -m 20 -I$proxy";
# as a second attempt, this will be used. This is not using HEAD but will
# get the whole frigging document!
my $linkcheckfull = "curl -s -m 20 -i$proxy";
# htmlget, URL will be appended to the right of this command line
my $htmlget = "curl -s$proxy";
# Parse the input URL and split it into the relevant parts:
my $getprotocol;
my $getserver;
my $getpath;
my $getdocument;
my %done;
my %tagtype;
my $allcount=0;
my $badlinks=0;
sub SplitURL {
my $inurl = $_[0];
if($inurl=~ /^([^:]+):\/\/([^\/]*)\/(.*)\/(.*)/ ) {
$getprotocol = $1;
$getserver = $2;
$getpath = $3;
$getdocument = $4;
}
elsif ($inurl=~ /^([^:]+):\/\/([^\/]*)\/(.*)/ ) {
$getprotocol = $1;
$getserver = $2;
$getpath = $3;
$getdocument = "";
if($getpath !~ /\//) {
$getpath ="";
$getdocument = $3;
}
}
elsif ($inurl=~ /^([^:]+):\/\/(.*)/ ) {
$getprotocol = $1;
$getserver = $2;
$getpath = "";
$getdocument = "";
}
else {
print "Couldn't parse the specified URL, retry please!\n";
exit;
}
}
my @indoc;
sub GetRootPage {
my $geturl = $_[0];
my $in="";
my $code=200;
my $type="text/plain";
my $pagemoved=0;
open(HEADGET, "$linkcheck $geturl|") ||
die "Couldn't get web page for some reason";
while(<HEADGET>) {
#print STDERR $_;
if($_ =~ /HTTP\/1\.[01] (\d\d\d) /) {
$code=$1;
if($code =~ /^3/) {
$pagemoved=1;
}
}
elsif($_ =~ /^Content-Type: ([\/a-zA-Z]+)/) {
$type=$1;
}
elsif($pagemoved &&
($_ =~ /^Location: (.*)/)) {
$geturl = $1;
&SplitURL($geturl);
$pagemoved++;
last;
}
}
close(HEADGET);
if($pagemoved == 1) {
print "Page is moved but we don't know where. Did you forget the ",
"traling slash?\n";
exit;
}
open(WEBGET, "$htmlget $geturl|") ||
die "Couldn't get web page for some reason";
while(<WEBGET>) {
my $line = $_;
push @indoc, $line;
$line=~ s/\n/ /g;
$line=~ s/\r//g;
# print $line."\n";
$in=$in.$line;
}
close(WEBGET);
return ($in, $code, $type);
}
sub LinkWorks {
my $check = $_[0];
# URL encode:
# $check =~s/([^a-zA-Z0-9_:\/.-])/uc sprintf("%%%02x",ord($1))/eg;
my @doc = `$linkcheck \"$check\"`;
my $head = 1;
# print "COMMAND: $linkcheck \"$check\"\n";
# print $doc[0]."\n";
boo:
if( $doc[0] =~ /^HTTP[^ ]+ (\d+)/ ) {
my $error = $1;
if($error < 400 ) {
return "GOOD";
}
else {
if($head && ($error >= 500)) {
# This server doesn't like HEAD!
@doc = `$linkcheckfull \"$check\"`;
$head = 0;
goto boo;
}
return "BAD";
}
}
return "BAD";
}
sub GetLinks {
my $in = $_[0];
my @result;
while($in =~ /[^<]*(<[^>]+>)/g ) {
# we have a tag in $1
my $tag = $1;
if($tag =~ /^<!--/) {
# this is a comment tag, ignore it
}
else {
if($tag =~ /(src|href|background|archive) *= *(\"[^\"]\"|[^ \)>]*)/i) {
my $url=$2;
if($url =~ /^\"(.*)\"$/) {
# this was a "string" now $1 has removed the quotes:
$url=$1;
}
$url =~ s/([^\#]*)\#.*/$1/g;
if($url eq "") {
# if the link was nothing than a #-link it may now have
# been emptied completely so then we skip the rest
next;
}
if($done{$url}) {
# if this url already is done, do next
$done{$url}++;
next;
}
$done{$url} = 1; # this is "done"
push @result, $url;
if($tag =~ /< *([^ ]+)/) {
$tagtype{$url}=$1;
}
}
}
}
return @result;
}
while(1) {
$geturl=-1;
for(keys %rooturls) {
if($rooturls{$_} == 1) {
if($_ !~ /^$firsturl/) {
$rooturls{$_} += 1000; # don't do this, outside our scope
if($verbose) {
print "SKIP: $_\n";
}
next;
}
$geturl=$_;
last;
}
}
if($geturl == -1) {
last;
}
if($verbose) {
print "ROOT: $geturl\n";
}
#
# Splits the URL in its different parts
#
&SplitURL($geturl);
#
# Returns the full HTML of the root page
#
my ($in, $error, $ctype) = &GetRootPage($geturl);
$rooturls{$geturl}++; # increase to prove we have already got it
if($ctype ne "text/html") {
# this is not HTML, we skip this
if($verbose == 2) {
print "Non-HTML link, skipping\n";
next;
}
}
if($error >= 400) {
print "$geturl return $error, exiting\n";
exit;
}
if($verbose == 2) {
printf("Error code $error, Content-Type: $ctype, got %d bytes\n",
length($in));
}
#print "protocol = $getprotocol\n";
#print "server = $getserver\n";
#print "path = $getpath\n";
#print "document = $getdocument\n";
#exit;
#
# Extracts all links from the given HTML buffer
#
my @links = &GetLinks($in);
for(@links) {
my $url = $_;
my $link;
if($url =~ /^([^:]+):/) {
my $prot = $1;
if($prot !~ /http/i) {
# this is an unsupported protocol, we ignore this
next;
}
$link = $url;
}
else {
if($external) {
next;
}
# this is a link on the same server:
if($url =~ /^\//) {
# from root
$link = "$getprotocol://$getserver$url";
}
else {
# from the scanned page's dir
my $nyurl=$url;
if(length($getpath) &&
($getpath !~ /\/$/) &&
($nyurl !~ /^\//)) {
# lacks ending slash, add one to the document part:
$nyurl = "/".$nyurl;
}
$link = "$getprotocol://$getserver/$getpath$nyurl";
}
}
my $success = &LinkWorks($link);
my $count = $done{$url};
$allcount += $count;
print "$success $count <".$tagtype{$url}."> $link $url\n";
$rooturls{$link}++; # check this if not checked already
if("BAD" eq $success) {
$badlinks++;
if($linenumber) {
my $line =1;
for(@indoc) {
if($_ =~ /$url/) {
print " line $line\n";
}
$line++;
}
}
}
}
}
if($verbose) {
print "$allcount links were checked";
if($badlinks > 0) {
print ", $badlinks were found bad";
}
print "\n";
}
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