444 lines
10 KiB
Perl
Executable File
444 lines
10 KiB
Perl
Executable File
#!/usr/bin/perl
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#
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# crawlink.pl
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#
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# This script crawls across all found links below the given "root" URL.
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# It reports all good and bad links to stdout. This code was based on the
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# checklink.pl script I wrote ages ago.
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#
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# Written to use 'curl' for URL checking.
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#
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# Author: Daniel Stenberg <daniel@haxx.se>
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# Version: 0.3 Jan 3, 2001
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#
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# HISTORY
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#
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# 0.3 - The -i now adds regexes that if a full URL link matches one of those,
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# it is not followed. This can then be used to prevent this script from
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# following '.*\.cgi', specific pages or whatever.
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#
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# 0.2 - Made it only HEAD non html files (i.e skip the GET). Makes it a lot
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# faster to skip large non HTML files such as pdfs or big RFCs! ;-)
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# Added a -c option that allows me to pass options to curl.
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#
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# 0.1 - The given url works as the root. This script will only continue
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# and check other URLs if the leftmost part of the new URL is identical
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# to the root URL.
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#
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use strict;
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my $in="";
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my $verbose=0;
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my $usestdin;
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my $linenumber;
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my $help;
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my $external;
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my $curlopts;
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my @ignorelist;
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argv:
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if($ARGV[0] eq "-v" ) {
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$verbose++;
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shift @ARGV;
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goto argv;
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}
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elsif($ARGV[0] eq "-c" ) {
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$curlopts=$ARGV[1];
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shift @ARGV;
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shift @ARGV;
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goto argv;
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}
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elsif($ARGV[0] eq "-i" ) {
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push @ignorelist, $ARGV[1];
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shift @ARGV;
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shift @ARGV;
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goto argv;
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}
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elsif($ARGV[0] eq "-l" ) {
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$linenumber = 1;
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shift @ARGV;
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goto argv;
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}
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elsif($ARGV[0] eq "-h" ) {
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$help = 1;
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shift @ARGV;
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goto argv;
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}
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elsif($ARGV[0] eq "-x" ) {
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$external = 1;
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shift @ARGV;
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goto argv;
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}
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my $geturl = $ARGV[0];
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my $firsturl= $geturl;
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#
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# Define a hash array to hold all root URLs to visit/we have visited
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#
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my %rooturls;
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$rooturls{$ARGV[0]}=1;
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if(($geturl eq "") || $help) {
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print "Usage: $0 [-hilvx] <full URL>\n",
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" Use a traling slash for directory URLs!\n",
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" -c [data] Pass [data] as argument to every curl invoke\n",
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" -h This help text\n",
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" -i [regex] Ignore root links that match this pattern\n",
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" -l Line number report for BAD links\n",
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" -v Verbose mode\n",
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" -x Check non-local (external?) links only\n";
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exit;
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}
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my $proxy;
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if($curlopts ne "") {
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$proxy=" $curlopts";
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#$proxy =" -x 194.237.142.41:80";
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}
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# linkchecker, URL will be appended to the right of this command line
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# this is the one using HEAD:
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my $linkcheck = "curl -s -m 20 -I$proxy";
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# as a second attempt, this will be used. This is not using HEAD but will
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# get the whole frigging document!
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my $linkcheckfull = "curl -s -m 20 -i$proxy";
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# htmlget, URL will be appended to the right of this command line
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my $htmlget = "curl -s$proxy";
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# Parse the input URL and split it into the relevant parts:
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my $getprotocol;
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my $getserver;
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my $getpath;
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my $getdocument;
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my %done;
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my %tagtype;
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my $allcount=0;
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my $badlinks=0;
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sub SplitURL {
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my $inurl = $_[0];
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if($inurl=~ /^([^:]+):\/\/([^\/]*)\/(.*)\/(.*)/ ) {
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$getprotocol = $1;
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$getserver = $2;
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$getpath = $3;
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$getdocument = $4;
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}
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elsif ($inurl=~ /^([^:]+):\/\/([^\/]*)\/(.*)/ ) {
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$getprotocol = $1;
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$getserver = $2;
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$getpath = $3;
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$getdocument = "";
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if($getpath !~ /\//) {
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$getpath ="";
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$getdocument = $3;
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}
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}
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elsif ($inurl=~ /^([^:]+):\/\/(.*)/ ) {
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$getprotocol = $1;
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$getserver = $2;
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$getpath = "";
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$getdocument = "";
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}
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else {
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print "Couldn't parse the specified URL, retry please!\n";
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exit;
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}
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}
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my @indoc;
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sub GetRootPage {
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my $geturl = $_[0];
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my $in="";
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my $code=200;
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my $type="text/plain";
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my $pagemoved=0;
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open(HEADGET, "$linkcheck $geturl|") ||
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die "Couldn't get web page for some reason";
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while(<HEADGET>) {
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#print STDERR $_;
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if($_ =~ /HTTP\/1\.[01] (\d\d\d) /) {
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$code=$1;
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if($code =~ /^3/) {
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$pagemoved=1;
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}
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}
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elsif($_ =~ /^Content-Type: ([\/a-zA-Z]+)/) {
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$type=$1;
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}
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elsif($pagemoved &&
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($_ =~ /^Location: (.*)/)) {
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$geturl = $1;
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&SplitURL($geturl);
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$pagemoved++;
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last;
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}
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}
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close(HEADGET);
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if($pagemoved == 1) {
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print "Page is moved but we don't know where. Did you forget the ",
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"traling slash?\n";
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exit;
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}
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if($type ne "text/html") {
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# there no point in getting anything but HTML
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$in="";
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}
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else {
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open(WEBGET, "$htmlget $geturl|") ||
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die "Couldn't get web page for some reason";
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while(<WEBGET>) {
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my $line = $_;
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push @indoc, $line;
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$line=~ s/\n/ /g;
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$line=~ s/\r//g;
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$in=$in.$line;
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}
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close(WEBGET);
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}
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return ($in, $code, $type);
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}
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sub LinkWorks {
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my $check = $_[0];
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# URL encode:
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# $check =~s/([^a-zA-Z0-9_:\/.-])/uc sprintf("%%%02x",ord($1))/eg;
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my @doc = `$linkcheck \"$check\"`;
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my $head = 1;
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# print "COMMAND: $linkcheck \"$check\"\n";
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# print $doc[0]."\n";
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boo:
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if( $doc[0] =~ /^HTTP[^ ]+ (\d+)/ ) {
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my $error = $1;
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if($error < 400 ) {
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return "GOOD";
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}
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else {
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if($head && ($error >= 500)) {
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# This server doesn't like HEAD!
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@doc = `$linkcheckfull \"$check\"`;
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$head = 0;
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goto boo;
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}
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return "BAD";
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}
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}
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return "BAD";
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}
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sub GetLinks {
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my $in = $_[0];
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my @result;
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while($in =~ /[^<]*(<[^>]+>)/g ) {
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# we have a tag in $1
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my $tag = $1;
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if($tag =~ /^<!--/) {
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# this is a comment tag, ignore it
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}
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else {
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if($tag =~ /(src|href|background|archive) *= *(\"[^\"]\"|[^ \)>]*)/i) {
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my $url=$2;
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if($url =~ /^\"(.*)\"$/) {
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# this was a "string" now $1 has removed the quotes:
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$url=$1;
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}
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$url =~ s/([^\#]*)\#.*/$1/g;
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if($url eq "") {
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# if the link was nothing than a #-link it may now have
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# been emptied completely so then we skip the rest
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next;
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}
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if($done{$url}) {
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# if this url already is done, do next
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$done{$url}++;
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if($verbose) {
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print " FOUND $url but that is already checked\n";
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}
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next;
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}
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$done{$url} = 1; # this is "done"
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push @result, $url;
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if($tag =~ /< *([^ ]+)/) {
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$tagtype{$url}=$1;
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}
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}
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}
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}
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return @result;
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}
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while(1) {
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$geturl=-1;
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for(keys %rooturls) {
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if($rooturls{$_} == 1) {
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if($_ !~ /^$firsturl/) {
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$rooturls{$_} += 1000; # don't do this, outside our scope
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if($verbose) {
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print "SKIP: $_\n";
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}
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next;
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}
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$geturl=$_;
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last;
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}
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}
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if($geturl == -1) {
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last;
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}
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#
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# Splits the URL in its different parts
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#
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&SplitURL($geturl);
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#
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# Returns the full HTML of the root page
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#
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my ($in, $error, $ctype) = &GetRootPage($geturl);
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$rooturls{$geturl}++; # increase to prove we have already got it
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if($ctype ne "text/html") {
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# this is not HTML, we skip this
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if($verbose == 2) {
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print "Non-HTML link, skipping\n";
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next;
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}
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}
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if($error >= 400) {
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print "ROOT page $geturl returned $error\n";
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next;
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}
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print " ==== $geturl ====\n";
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if($verbose == 2) {
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printf("Error code $error, Content-Type: $ctype, got %d bytes\n",
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length($in));
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}
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#print "protocol = $getprotocol\n";
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#print "server = $getserver\n";
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#print "path = $getpath\n";
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#print "document = $getdocument\n";
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#exit;
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#
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# Extracts all links from the given HTML buffer
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#
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my @links = &GetLinks($in);
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for(@links) {
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my $url = $_;
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my $link;
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if($url =~ /^([^:]+):/) {
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my $prot = $1;
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if($prot !~ /http/i) {
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# this is an unsupported protocol, we ignore this
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next;
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}
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$link = $url;
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}
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else {
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if($external) {
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next;
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}
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# this is a link on the same server:
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if($url =~ /^\//) {
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# from root
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$link = "$getprotocol://$getserver$url";
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}
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else {
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# from the scanned page's dir
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my $nyurl=$url;
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if(length($getpath) &&
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($getpath !~ /\/$/) &&
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($nyurl !~ /^\//)) {
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# lacks ending slash, add one to the document part:
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$nyurl = "/".$nyurl;
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}
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$link = "$getprotocol://$getserver/$getpath$nyurl";
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}
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}
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my $success = &LinkWorks($link);
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my $count = $done{$url};
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$allcount += $count;
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print "$success $count <".$tagtype{$url}."> $link $url\n";
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if("BAD" eq $success) {
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$badlinks++;
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if($linenumber) {
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my $line =1;
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for(@indoc) {
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if($_ =~ /$url/) {
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print " line $line\n";
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}
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$line++;
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}
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}
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}
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else {
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# the link works, add it if it isn't in the ingore list
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my $ignore=0;
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for(@ignorelist) {
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if($link =~ /$_/) {
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$ignore=1;
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}
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}
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if(!$ignore) {
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# not ignored, add
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$rooturls{$link}++; # check this if not checked already
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}
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}
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}
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}
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if($verbose) {
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print "$allcount links were checked";
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if($badlinks > 0) {
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print ", $badlinks were found bad";
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}
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print "\n";
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}
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