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+#!@PERL@
+#
+# checklinks.pl
+#
+# This script extracts all links from a HTML page and checks their validity.
+# Written to use 'curl' for URL checking.
+#
+# Author: Daniel Stenberg <Daniel.Stenberg@sth.frontec.se>
+# Version: 0.7 Sept 30, 1998
+#
+# HISTORY
+#
+# 0.5 - Cuts off the #-part from links before checking.
+#
+# 0.6 - Now deals with error codes 3XX better and follows the Location:
+# properly.
+# - Added the -x flag that only checks http:// -links
+#
+# 0.7 - Ok, http://www.viunga.se/main.html didn't realize this had no path
+# but a document. Now it does.
+#
+#
+
+$in="";
+
+ argv:
+if($ARGV[0] eq "-v" ) {
+ $verbose = 1;
+ shift @ARGV;
+ goto argv;
+}
+elsif($ARGV[0] eq "-i" ) {
+ $usestdin = 1;
+ shift @ARGV;
+ goto argv;
+}
+elsif($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" ) {
+ $external = 1;
+ shift @ARGV;
+ goto argv;
+}
+
+$geturl = $ARGV[0];
+
+if(($geturl eq "") || $help) {
+ print "Usage: $0 [-hilvx] <full URL>\n",
+ " Use a traling slash for directory URLs!\n",
+ " -h This help text\n",
+ " -i Read the initial page from stdin\n",
+ " -l Line number report for BAD links\n",
+ " -v Verbose mode\n",
+ " -x Check non-local (external?) links only\n";
+ exit;
+}
+
+if($ARGV[1] eq "-") {
+ print "We use stdin!\n";
+ $usestdin = 1;
+}
+
+# This is necessary from where I tried this:
+#$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:
+$linkcheck = "curl -s -m 20 -I$proxy";
+
+# as a second attempt, this will be used. This is not using HEAD but will
+# get the whole frigging document!
+$linkcheckfull = "curl -s -m 20 -i$proxy";
+
+# htmlget, URL will be appended to the right of this command line
+$htmlget = "curl -s$proxy";
+
+# Parse the input URL and split it into the relevant parts:
+
+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 = "";
+ $getdocument = "";
+ }
+ else {
+ print "Couldn't parse the specified URL, retry please!\n";
+ exit;
+ }
+}
+
+&SplitURL($geturl);
+
+#print "protocol = $getprotocol\n";
+#print "server = $getserver\n";
+#print "path = $getpath\n";
+#print "document = $getdocument\n";
+#exit;
+
+if(!$usestdin) {
+ open(HEADGET, "$linkcheck $geturl|") ||
+ die "Couldn't get web page for some reason";
+ headget:
+ while(<HEADGET>) {
+# print $_;
+ if($_ =~ /HTTP\/.*3\d\d /) {
+ $pagemoved=1;
+ }
+ elsif($pagemoved &&
+ ($_ =~ /^Location: (.*)/)) {
+ $geturl = $1;
+
+ &SplitURL($geturl);
+
+ $pagemoved++;
+ last headget;
+ }
+ }
+ close(HEADGET);
+
+ if($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>) {
+ $line = $_;
+ push @indoc, $line;
+ $line=~ s/\n//g;
+ $line=~ s/\r//g;
+# print $line."\n";
+ $in=$in.$line;
+ }
+
+ close(WEBGET);
+}
+else {
+ while(<STDIN>) {
+ $line = $_;
+ push @indoc, $line;
+ $line=~ s/\n//g;
+ $line=~ s/\r//g;
+ $in=$in.$line;
+ }
+}
+
+#print length($in)."\n";
+
+sub LinkWorks {
+ my $check = $_[0];
+
+# URL encode:
+# $check =~s/([^a-zA-Z0-9_:\/.-])/uc sprintf("%%%02x",ord($1))/eg;
+
+ @doc = `$linkcheck \"$check\"`;
+
+ $head = 1;
+
+# print "COMMAND: $linkcheck \"$check\"\n";
+# print $doc[0]."\n";
+
+ boo:
+ if( $doc[0] =~ /^HTTP[^ ]+ (\d+)/ ) {
+ $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 = $_[0];
+ my @result;
+
+ getlinkloop:
+ while($in =~ /[^<]*(<[^>]+>)/g ) {
+ # we have a tag in $1
+ $tag = $1;
+
+ if($tag =~ /^<!--/) {
+ # this is a comment tag, ignore it
+ }
+ else {
+ if($tag =~ /(src|href|background|archive) *= *(\"[^\"]\"|[^ )>]*)/i) {
+ $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 getlinkloop;
+ }
+
+ if($done{$url}) {
+ # if this url already is done, do next
+ $done{$url}++;
+ next getlinkloop;
+ }
+
+ $done{$url} = 1; # this is "done"
+
+ push @result, $url;
+ if($tag =~ /< *([^ ]+)/) {
+# print "TAG: $1\n";
+ $tagtype{$url}=$1;
+ }
+ }
+ }
+ }
+ return @result;
+}
+
+@links = &GetLinks($in);
+
+ linkloop:
+for(@links) {
+ $url = $_;
+
+ if($url =~ /^([^:]+):/) {
+ $prot = $1;
+# if($prot !~ /(http|ftp|gopher)/i) {
+ if($prot !~ /http/i) {
+ # this is an unsupported protocol, we ignore this
+ next linkloop;
+ }
+ $link = $url;
+ }
+ else {
+ if($external) {
+ next linkloop;
+ }
+
+ # this is a link on the save server:
+ if($url =~ /^\//) {
+ # from root
+ $link = "$getprotocol://$getserver$url";
+ }
+ else {
+ # from the scanned page's dir
+ $nyurl=$url;
+
+ if(length($getpath) &&
+ ($getpath !~ /\/$/) &&
+ ($nyurl !~ /^\//)) {
+ # lacks ending slash, add one to the document part:
+ $nyurl = "/".$nyurl;
+ }
+ $link = "$getprotocol://$getserver/$getpath$nyurl";
+ }
+ }
+
+#print "test $link\n";
+#$success = "GOOD";
+
+ $success = &LinkWorks($link);
+
+ $count = $done{$url};
+
+ $allcount += $count;
+
+ print "$success $count <".$tagtype{$url}."> $link $url\n";
+
+# If bad and -l, present the line numbers of the usage
+ if("BAD" eq $success) {
+ $badlinks++;
+ if($linenumber) {
+ $line =1;
+ for(@indoc) {
+ if($_ =~ /$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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