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Daniel Stenberg
1999-12-29 14:20:26 +00:00
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perl/checklinks.pl.in Executable file
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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";
}