home *** CD-ROM | disk | FTP | other *** search
- @rem = '--*-Perl-*--
- @echo off
- if "%OS%" == "Windows_NT" goto WinNT
- perl -x -S "%0" %1 %2 %3 %4 %5 %6 %7 %8 %9
- goto endofperl
- :WinNT
- perl -x -S "%0" %*
- if NOT "%COMSPEC%" == "%SystemRoot%\system32\cmd.exe" goto endofperl
- if %errorlevel% == 9009 echo You do not have Perl in your PATH.
- goto endofperl
- @rem ';
- #!perl
- #line 14
- ##
- ## Jeffrey Friedl (jfriedl@omron.co.jp)
- ## Copyri.... ah hell, just take it.
- ##
- ## This is "www.pl".
- ## Include (require) to use, execute ("perl www.pl") to print a man page.
- ## Requires my 'network.pl' library.
- package www;
- $version = "951219.9";
-
- ##
- ## 951219.9
- ## -- oops, stopped sending garbage Authorization line when no
- ## authorization was requested.
- ##
- ## 951114.8
- ## -- added support for HEAD, If-Modified-Since
- ##
- ## 951017.7
- ## -- Change to allow a POST'ed HTTP text to have newlines in it.
- ## Added 'NewURL to the open_http_connection %info. Idea courtesy
- ## of Bryan Schmersal (http://www.transarc.com/~bryans/Home.html).
- ##
- ##
- ## 950921.6
- ## -- added more robust HTTP error reporting
- ## (due to steven_campbell@uk.ibm.com)
- ##
- ## 950911.5
- ## -- added Authorization support
- ##
-
- ##
- ## HTTP return status codes.
- ##
- %http_return_code =
- (200,"OK",
- 201,"Created",
- 202,"Accepted",
- 203,"Partial Information",
- 204,"No Response",
- 301,"Moved",
- 302,"Found",
- 303,"Method",
- 304,"Not modified",
- 400,"Bad request",
- 401,"Unauthorized",
- 402,"Payment required",
- 403,"Forbidden",
- 404,"Not found",
- 500,"Internal error",
- 501,"Not implemented",
- 502,"Service temporarily overloaded",
- 503,"Gateway timeout");
-
- ##
- ## If executed directly as a program, print as a man page.
- ##
- if (length($0) >= 6 && substr($0, -6) eq 'www.pl')
- {
- seek(DATA, 0, 0) || die "$0: can't reset internal pointer.\n";
- print "www.pl version $version\n", '=' x 60, "\n";
- while (<DATA>) {
- next unless /^##>/../^##</; ## select lines to print
- s/^##[<> ]?//; ## clean up
- print;
- }
- exit(0);
- }
-
- ##
- ## History:
- ## version 950425.4
- ## added require for "network.pl"
- ##
- ## version 950425.3
- ## re-did from "Www.pl" which was a POS.
- ##
- ##
- ## BLURB:
- ## A group of routines for dealing with URLs, HTTP sessions, proxies, etc.
- ## Requires my 'network.pl' package. The library file can be executed
- ## directly to produce a man page.
-
- ##>
- ## A motley group of routines for dealing with URLs, HTTP sessions, proxies,
- ## etc. Requires my 'network.pl' package.
- ##
- ## Latest version, as well as other stuff (including network.pl) available
- ## at http://www.wg.omron.co.jp/~jfriedl/perl/
- ##
- ## Simpleton complete program to dump a URL given on the command-line:
- ##
- ## require 'network.pl'; ## required for www.pl
- ## require 'www.pl'; ## main routines
- ## $URL = shift; ## get URL
- ## ($status, $memo) = &www'open_http_url(*IN, $URL); ## connect
- ## die "$memo\n" if $status ne 'ok'; ## report any error
- ## print while <IN>; ## dump contents
- ##
- ## There are various options available for open_http_url.
- ## For example, adding 'quiet' to the call, i.e. vvvvvvv-----added
- ## ($status, $memo) = &www'open_http_url(*IN, $URL, 'quiet');
- ## suppresses the normal informational messages such as "waiting for data...".
- ##
- ## The options, as well as the various other public routines in the package,
- ## are discussed below.
- ##
- ##<
-
- ##
- ## Default port for the protocols whose URL we'll at least try to recognize.
- ##
- %default_port = ('http', 80,
- 'ftp', 21,
- 'gopher', 70,
- 'telnet', 23,
- 'wais', 210,
- );
-
- ##
- ## A "URL" to "ftp.blah.com" without a protocol specified is probably
- ## best reached via ftp. If the hostname begins with a protocol name, it's
- ## easy. But something like "www." maps to "http", so that mapping is below:
- ##
- %name2protocol = (
- 'www', 'http',
- 'wwwcgi','http',
- );
-
- $last_message_length = 0;
- $useragent = "www.pl/$version";
-
- ##
- ##>
- ##############################################################################
- ## routine: open_http_url
- ##
- ## Used as
- ## ($status, $memo, %info) = &www'open_http_url(*FILEHANDLE, $URL, options..)
- ##
- ## Given an unused filehandle, a URL, and a list of options, opens a socket
- ## to the URL and returns with the filehandle ready to read the data of the
- ## URL. The HTTP header, as well as other information, is returned in %info.
- ##
- ## OPTIONS are from among:
- ##
- ## "post"
- ## If PATH appears to be a query (i.e. has a ? in it), contact
- ## via a POST rather than a GET.
- ##
- ## "nofollow"
- ## Normally, if the initial contact indicates that the URL has moved
- ## to a different location, the new location is automatically contacted.
- ## "nofollow" inhibits this.
- ##
- ## "noproxy"
- ## Normally, a proxy will be used if 'http_proxy' is defined in the
- ## environment. This option inhibits the use of a proxy.
- ##
- ## "retry"
- ## If a host's address can't be found, it may well be because the
- ## nslookup just didn't return in time and that retrying the lookup
- ## after a few seconds will succeed. If this option is given, will
- ## wait five seconds and try again. May be given multiple times to
- ## retry multiple times.
- ##
- ## "quiet"
- ## Informational messages will be suppressed.
- ##
- ## "debug"
- ## Additional messages will be printed.
- ##
- ## "head"
- ## Requests only the file header to be sent
- ##
- ##
- ##
- ##
- ## The return array is ($STATUS, $MEMO, %INFO).
- ##
- ## STATUS is 'ok', 'error', 'status', or 'follow'
- ##
- ## If 'error', the MEMO will indicate why (URL was not http, can't
- ## connect, etc.). INFO is probably empty, but may have some data.
- ## See below.
- ##
- ## If 'status', the connnection was made but the reply was not a normal
- ## "OK" successful reply (i.e. "Not found", etc.). MEMO is a note.
- ## INFO is filled as noted below. Filehandle is ready to read (unless
- ## $info{'BODY'} is filled -- see below), but probably most useful
- ## to treat this as an 'error' response.
- ##
- ## If 'follow', MEMO is the new URL (for when 'nofollow' was used to
- ## turn off automatic following) and INFO is filled as described
- ## below. Unless you wish to give special treatment to these types of
- ## responses, you can just treat 'follow' responses like 'ok'
- ## responses.
- ##
- ## If 'ok', the connection went well and the filehandle is ready to
- ## read.
- ##
- ## INFO contains data as described at the read_http_header() function (in
- ## short, the HTTP response header) and additional informational fields.
- ## In addition, the following fields are filled in which describe the raw
- ## connection made or attempted:
- ##
- ## PROTOCOL, HOST, PORT, PATH
- ##
- ## Note that if a proxy is being used, these will describe the proxy.
- ## The field TARGET will describe the host or host:port ultimately being
- ## contacted. When no proxy is being used, this will be the same info as
- ## in the raw connection fields above. However, if a proxy is being used,
- ## it will refer to the final target.
- ##
- ## In some cases, the additional entry $info{'BODY'} exists as well. If
- ## the result-code indicates an error, the body of the message may be
- ## parsed for internal reasons (i.e. to support 'repeat'), and if so, it
- ## will be saved in $info{'BODY}.
- ##
- ## If the URL has moved, $info{'NewURL'} will exist and contain the new
- ## URL. This will be true even if the 'nofollow' option is specified.
- ##
- ##<
- ##
- sub open_http_url
- {
- local(*HTTP, $URL, @options) = @_;
- return &open_http_connection(*HTTP, $URL, undef, undef, undef, @options);
- }
-
-
- ##
- ##>
- ##############################################################################
- ## routine: read_http_header
- ##
- ## Given a filehandle to a just-opened HTTP socket connection (such as one
- ## created via &network'connect_to which has had the HTTP request sent),
- ## reads the HTTP header and and returns the parsed info.
- ##
- ## ($replycode, %info) = &read_http_header(*FILEHANDLE);
- ##
- ## $replycode will be the HTTP reply code as described below, or
- ## zero on header-read error.
- ##
- ## %info contains two types of fields:
- ##
- ## Upper-case fields are informational from the function.
- ## Lower-case fields are the header field/value pairs.
- ##
- ## Upper-case fields:
- ##
- ## $info{'STATUS'} will be the first line read (HTTP status line)
- ##
- ## $info{'CODE'} will be the numeric HTTP reply code from that line.
- ## This is also returned as $replycode.
- ##
- ## $info{'TYPE'} is the text from the status line that follows CODE.
- ##
- ## $info{'HEADER'} will be the raw text of the header (sans status line),
- ## newlines and all.
- ##
- ## $info{'UNKNOWN'}, if defined, will be any header lines not in the
- ## field/value format used to fill the lower-case fields of %info.
- ##
- ## Lower-case fields are reply-dependent, but in general are described
- ## in http://info.cern.ch/hypertext/WWW/Protocols/HTTP/Object_Headers.html
- ##
- ## A header line such as
- ## Content-type: Text/Plain
- ## will appear as $info{'content-type'} = 'Text/Plain';
- ##
- ## (*) Note that while the field names are are lower-cased, the field
- ## values are left as-is.
- ##
- ##
- ## When $replycode is zero, there are two possibilities:
- ## $info{'TYPE'} is 'empty'
- ## No response was received from the filehandle before it was closed.
- ## No other %info fields present.
- ## $info{'TYPE'} is 'unknown'
- ## First line of the response doesn't seem to be proper HTTP.
- ## $info{'STATUS'} holds that line. No other %info fields present.
- ##
- ## The $replycode, when not zero, is as described at
- ## http://info.cern.ch/hypertext/WWW/Protocols/HTTP/HTRESP.html
- ##
- ## Some of the codes:
- ##
- ## success 2xx
- ## ok 200
- ## created 201
- ## accepted 202
- ## partial information 203
- ## no response 204
- ## redirection 3xx
- ## moved 301
- ## found 302
- ## method 303
- ## not modified 304
- ## error 4xx, 5xx
- ## bad request 400
- ## unauthorized 401
- ## paymentrequired 402
- ## forbidden 403
- ## not found 404
- ## internal error 500
- ## not implemented 501
- ## service temporarily overloaded 502
- ## gateway timeout 503
- ##
- ##<
- ##
- sub read_http_header
- {
- local(*HTTP) = @_;
- local(%info, $_);
-
- ##
- ## The first line of the response will be the status (OK, error, etc.)
- ##
- unless (defined($info{'STATUS'} = <HTTP>)) {
- $info{'TYPE'} = "empty";
- return (0, %info);
- }
- chop $info{'STATUS'};
-
- ##
- ## Check the status line. If it doesn't match and we don't know the
- ## format, we'll just let it pass and hope for the best.
- ##
- unless ($info{'STATUS'} =~ m/^HTTP\S+\s+(\d\d\d)\s+(.*\S)/i) {
- $info{'TYPE'} = 'unknown';
- return (0, %info);
- }
-
- $info{'CODE'} = $1;
- $info{'TYPE'} = $2;
- $info{'HEADER'} = '';
-
- ## read the rest of the header.
- while (<HTTP>) {
- last if m/^\s*$/;
- $info{'HEADER'} .= $_; ## save whole text of header.
-
- if (m/^([^\n:]+):[ \t]*(.*\S)/) {
- local($field, $value) = ("\L$1", $2);
- if (defined $info{$field}) {
- $info{$field} .= "\n" . $value;
- } else {
- $info{$field} = $value;
- }
- } elsif (defined $info{'UNKNOWN'}) {
- $info{'UNKNOWN'} .= $_;
- } else {
- $info{'UNKNOWN'} = $_;
- }
- }
-
- return ($info{'CODE'}, %info);
- }
-
- ##
- ##>
- ##
- ##############################################################################
- ## routine: grok_URL(URL, noproxy, defaultprotocol)
- ##
- ## Given a URL, returns access information. Deals with
- ## http, wais, gopher, ftp, and telnet
- ## URLs.
- ##
- ## Information returned is
- ## (PROTOCOL, HOST, PORT, PATH, TARGET, USER, PASSWORD)
- ##
- ## If noproxy is not given (or false) and there is a proxy defined
- ## for the given protocol (via the "*_proxy" environmental variable),
- ## the returned access information will be for the proxy and will
- ## reference the given URL. In this case, 'TARGET' will be the
- ## HOST:PORT of the original URL (PORT elided if it's the default port).
- ##
- ## Access information returned:
- ## PROTOCOL: "http", "ftp", etc. (guaranteed to be lowercase).
- ## HOST: hostname or address as given.
- ## PORT: port to access
- ## PATH: path of resource on HOST:PORT.
- ## TARGET: (see above)
- ## USER and PASSWORD: for 'ftp' and 'telnet' URLs, if supplied by the
- ## URL these will be defined, undefined otherwise.
- ##
- ## If no protocol is defined via the URL, the defaultprotocol will be used
- ## if given. Otherwise, the URL's address will be checked for a leading
- ## protocol name (as with a leading "www.") and if found will be used.
- ## Otherwise, the protocol defaults to http.
- ##
- ## Fills in the appropriate default port for the protocol if need be.
- ##
- ## A proxy is defined by a per-protocol environmental variable such
- ## as http_proxy. For example, you might have
- ## setenv http_proxy http://firewall:8080/
- ## setenv ftp_proxy $http_proxy
- ## to set it up.
- ##
- ## A URL seems to be officially described at
- ## http://www.w3.org/hypertext/WWW/Addressing/URL/5_BNF.html
- ## although that document is a joke of errors.
- ##
- ##<
- ##
- sub grok_URL
- {
- local($_, $noproxy, $defaultprotocol) = @_;
- $noproxy = defined($noproxy) && $noproxy;
-
- ## Items to be filled in and returned.
- local($protocol, $address, $port, $path, $target, $user, $password);
-
- return undef unless m%^(([a-zA-Z]+)://|/*)([^/]+)(/.*)?$%;
-
- ##
- ## Due to a bug in some versions of perl5, $2 might not be empty
- ## even if $1 is. Therefore, we must check $1 for a : to see if the
- ## protocol stuff matched or not. If not, the protocol is undefined.
- ##
- ($protocol, $address, $path) = ((index($1,":") >= 0 ? $2 : undef), $3, $4);
-
- if (!defined $protocol)
- {
- ##
- ## Choose a default protocol if none given. If address begins with
- ## a protocol name (one that we know via %name2protocol or
- ## %default_port), choose it. Otherwise, choose http.
- ##
- if (defined $defaultprotocol) {
- $protocol = $defaultprotocol;
- }
- else
- {
- $address =~ m/^[a-zA-Z]+/;
- if (defined($name2protocol{"\L$&"})) {
- $protocol = $name2protocol{"\L$&"};
- } else {
- $protocol = defined($default_port{"\L$&"}) ? $& : 'http';
- }
- }
- }
- $protocol =~ tr/A-Z/a-z/; ## ensure lower-case.
-
- ##
- ## Http support here probably not kosher, but fits in nice for basic
- ## authorization.
- ##
- if ($protocol eq 'ftp' || $protocol eq 'telnet' || $protocol eq 'http')
- {
- ## Glean a username and password from address, if there.
- ## There if address starts with USER[:PASSWORD]@
- if ($address =~ s/^(([^\@:]+)(:([^@]+))?\@)//) {
- ($user, $password) = ($2, $4);
- }
- }
-
- ##
- ## address left is (HOSTNAME|HOSTNUM)[:PORTNUM]
- ##
- if ($address =~ s/:(\d+)$//) {
- $port = $1;
- } else {
- $port = $default_port{$protocol};
- }
-
- ## default path is '/';
- $path = '/' if !defined $path;
-
- ##
- ## If there's a proxy and we're to proxy this request, do so.
- ##
- local($proxy) = $ENV{$protocol."_proxy"};
- if (!$noproxy && defined($proxy) && !&no_proxy($protocol,$address))
- {
- local($dummy);
- local($old_pass, $old_user);
-
- ##
- ## Since we're going through a proxy, we want to send the
- ## proxy the entire URL that we want. However, when we're
- ## doing Authenticated HTTP, we need to take out the user:password
- ## that webget has encoded in the URL (this is a bit sleazy on
- ## the part of webget, but the alternative is to have flags, and
- ## having them part of the URL like with FTP, etc., seems a bit
- ## cleaner to me in the context of how webget is used).
- ##
- ## So, if we're doing this slezy thing, we need to construct
- ## the new URL from the compnents we have now (leaving out password
- ## and user), decode the proxy URL, then return the info for
- ## that host, a "filename" of the entire URL we really want, and
- ## the user/password from the original URL.
- ##
- ## For all other things, we can just take the original URL,
- ## ensure it has a protocol on it, and pass it as the "filename"
- ## we want to the proxy host. The difference between reconstructing
- ## the URL (as for HTTP Authentication) and just ensuring the
- ## protocol is there is, except for the user/password stuff,
- ## nothing. In theory, at least.
- ##
- if ($protocol eq 'http' && (defined($password) || defined($user)))
- {
- $path = "http://$address$path";
- $old_pass = $password;
- $old_user = $user;
- } else {
- ## Re-get original URL and ensure protocol// actually there.
- ## This will become our new path.
- ($path = $_) =~ s,^($protocol:)?/*,$protocol://,i;
- }
-
- ## note what the target will be
- $target = ($port==$default_port{$protocol})?$address:"$address:$port";
-
- ## get proxy info, discarding
- ($protocol, $address, $port, $dummy, $dummy, $user, $password)
- = &grok_URL($proxy, 1);
- $password = $old_pass if defined $old_pass;
- $user = $old_user if defined $old_user;
- }
- ($protocol, $address, $port, $path, $target, $user, $password);
- }
-
-
-
- ##
- ## &no_proxy($protocol, $host)
- ##
- ## Returns true if the specified host is identified in the no_proxy
- ## environmental variable, or identify the proxy server itself.
- ##
- sub no_proxy
- {
- local($protocol, $targethost) = @_;
- local(@dests, $dest, $host, @hosts, $aliases);
- local($proxy) = $ENV{$protocol."_proxy"};
- return 0 if !defined $proxy;
- $targethost =~ tr/A-Z/a-z/; ## ensure all lowercase;
-
- @dests = ($proxy);
- push(@dests,split(/\s*,\s*/,$ENV{'no_proxy'})) if defined $ENV{'no_proxy'};
-
- foreach $dest (@dests)
- {
- ## just get the hostname
- $host = (&grok_URL($dest, 1), 'http')[1];
-
- if (!defined $host) {
- warn "can't grok [$dest] from no_proxy env.var.\n";
- next;
- }
- @hosts = ($host); ## throw in original name just to make sure
- ($host, $aliases) = (gethostbyname($host))[0, 1];
-
- if (defined $aliases) {
- push(@hosts, ($host, split(/\s+/, $aliases)));
- } else {
- push(@hosts, $host);
- }
- foreach $host (@hosts) {
- next if !defined $host;
- return 1 if "\L$host" eq $targethost;
- }
- }
- return 0;
- }
-
- sub ensure_proper_network_library
- {
- require 'network.pl' if !defined $network'version;
- warn "WARNING:\n". __FILE__ .
- qq/ needs a newer version of "network.pl"\n/ if
- !defined($network'version) || $network'version < "950311.5";
- }
-
-
-
- ##
- ##>
- ##############################################################################
- ## open_http_connection(*FILEHANDLE, HOST, PORT, PATH, TARGET, OPTIONS...)
- ##
- ## Opens an HTTP connection to HOST:PORT and requests PATH.
- ## TARGET is used only for informational messages to the user.
- ##
- ## If PORT and PATH are undefined, HOST is taken as an http URL and TARGET
- ## is filled in as needed.
- ##
- ## Otherwise, it's the same as open_http_url (including return value, etc.).
- ##<
- ##
- sub open_http_connection
- {
- local(*HTTP, $host, $port, $path, $target, @options) = @_;
- local($post_text, @error, %seen);
- local(%info);
-
- &ensure_proper_network_library;
-
- ## options allowed:
- local($post, $retry, $authorization, $nofollow, $noproxy,
- $head, $debug, $ifmodifiedsince, $quiet, ) = (0) x 10;
- ## parse options:
- foreach $opt (@options)
- {
- next unless defined($opt) && $opt ne '';
- local($var, $val);
- if ($opt =~ m/^(\w+)=(.*)/) {
- ($var, $val) = ($1, $2);
- } else {
- $var = $opt;
- $val = 1;
- }
- $var =~ tr/A-Z/a-z/; ## ensure variable is lowercase.
- local(@error);
-
- eval "if (defined \$$var) { \$$var = \$val; } else { \@error =
- ('error', 'bad open_http_connection option [$opt]'); }";
- return ('error', "open_http_connection eval: $@") if $@;
- return @error if defined @error;
- }
- $quiet = 0 if $debug; ## debug overrides quiet
-
- local($protocol, $error, $code, $URL, %info, $tmp, $aite);
-
- ##
- ## if both PORT and PATH are undefined, treat HOST as a URL.
- ##
- unless (defined($port) && defined($path))
- {
- ($protocol,$host,$port,$path,$target)=&grok_URL($host,$noproxy,'http');
- if ($protocol ne "http") {
- return ('error',"open_http_connection doesn't grok [$protocol]");
- }
- unless (defined($host)) {
- return ('error', "can't grok [$URL]");
- }
- }
-
- return ('error', "no port in URL [$URL]") unless defined $port;
- return ('error', "no path in URL [$URL]") unless defined $path;
-
- RETRY: while(1)
- {
- ## we'll want $URL around for error messages and such.
- if ($port == $default_port{'http'}) {
- $URL = "http://$host";
- } else {
- $URL = "http://$host:$default_port{'http'}";
- }
- $URL .= ord($path) eq ord('/') ? $path : "/$path";
-
- $aite = defined($target) ? "$target via $host" : $host;
-
- &message($debug, "connecting to $aite ...") unless $quiet;
-
- ##
- ## note some info that might be of use to the caller.
- ##
- local(%preinfo) = (
- 'PROTOCOL', 'http',
- 'HOST', $host,
- 'PORT', $port,
- 'PATH', $path,
- );
- if (defined $target) {
- $preinfo{'TARGET'} = $target;
- } elsif ($default_port{'http'} == $port) {
- $preinfo{'TARGET'} = $host;
- } else {
- $preinfo{'TARGET'} = "$host:$port";
- }
-
- ## connect to the site
- $error = &network'connect_to(*HTTP, $host, $port);
- if (defined $error) {
- return('error', "can't connect to $aite: $error", %preinfo);
- }
-
- ## If we're asked to POST and it looks like a POST, note post text.
- if ($post && $path =~ m/\?/) {
- $post_text = $'; ## everything after the '?'
- $path = $`; ## everything before the '?'
- }
-
- ## send the POST or GET request
- $tmp = $head ? 'HEAD' : (defined $post_text ? 'POST' : 'GET');
-
- &message($debug, "sending request to $aite ...") if !$quiet;
- print HTTP $tmp, " $path HTTP/1.0\n";
-
- ## send the If-Modified-Since field if needed.
- if ($ifmodifiedsince) {
- print HTTP "If-Modified-Since: $ifmodifiedsince\n";
- }
-
- ## oh, let's sputter a few platitudes.....
- print HTTP "Accept: */*\n";
- print HTTP "User-Agent: $useragent\n" if defined $useragent;
-
- ## If doing Authorization, do so now.
- if ($authorization) {
- print HTTP "Authorization: Basic ",
- &htuu_encode($authorization), "\n";
- }
-
- ## If it's a post, send it.
- if (defined $post_text)
- {
- print HTTP "Content-type: application/x-www-form-urlencoded\n";
- print HTTP "Content-length: ", length $post_text, "\n\n";
- print HTTP $post_text, "\n";
- }
- print HTTP "\n";
- &message($debug, "waiting for data from $aite ...") unless $quiet;
-
- ## we can now read the response (header, then body) via HTTP.
- binmode(HTTP); ## just in case.
-
- ($code, %info) = &read_http_header(*HTTP);
- &message(1, "header returns code $code ($info{'TYPE'})") if $debug;
-
- ## fill in info from %preinfo
- local($val, $key);
- while (($val, $key) = each %preinfo) {
- $info{$val} = $key;
- }
-
- if ($code == 0)
- {
- return('error',"empty response for $URL")
- if $info{'TYPE'} eq 'empty';
- return('error', "non-HTTP response for $URL", %info)
- if $info{'TYPE'} eq 'unknown';
- return('error', "unknown zero-code for $URL", %info);
- }
-
- if ($code == 302) ## 302 is magic for "Found"
- {
- if (!defined $info{'location'}) {
- return('error', "No location info for Found URL $URL", %info);
- }
- local($newURL) = $info{'location'};
-
- ## Remove :80 from hostname, if there. Looks ugly.
- $newURL =~ s,^(http:/+[^/:]+):80/,$1/,i;
- $info{"NewURL"} = $newURL;
-
- ## if we're not following links or if it's not to HTTP, return.
- return('follow', $newURL, %info) if
- $nofollow || $newURL!~m/^http:/i;
-
- ## note that we've seen this current URL.
- $seen{$host, $port, $path} = 1;
-
- &message(1, qq/[note: now moved to "$newURL"]/) unless $quiet;
-
-
- ## get the new one and return an error if it's been seen.
- ($protocol, $host, $port, $path, $target) =
- &www'grok_URL($newURL, $noproxy);
- &message(1, "[$protocol][$host][$port][$path]") if $debug;
-
- if (defined $seen{$host, $port, $path})
- {
- return('error', "circular reference among:\n ".
- join("\n ", sort grep(/^http/i, keys %seen)), %seen);
- }
- next RETRY;
- }
- elsif ($code == 500) ## 500 is magic for "internal error"
- {
- ##
- ## A proxy will often return this with text saying "can't find
- ## host" when in reality it's just because the nslookup returned
- ## null at the time. Such a thing should be retied again after a
- ## few seconds.
- ##
- if ($retry)
- {
- local($_) = $info{'BODY'} = join('', <HTTP>);
- if (/Can't locate remote host:\s*(\S+)/i) {
- local($times) = ($retry == 1) ?
- "once more" : "up to $retry more times";
- &message(0, "can't locate $1, will try $times ...")
- unless $quiet;
- sleep(5);
- $retry--;
- next RETRY;
- }
- }
- }
-
- if ($code != 200) ## 200 is magic for "OK";
- {
- ## I'll deal with these as I see them.....
- &clear_message;
- if ($info{'TYPE'} eq '')
- {
- if (defined $http_return_code{$code}) {
- $info{'TYPE'} = $http_return_code{$code};
- } else {
- $info{'TYPE'} = "(unknown status code $code)";
- }
- }
- return ('status', $info{'TYPE'}, %info);
- }
-
- &clear_message;
- return ('ok', 'ok', %info);
- }
- }
-
-
- ##
- ## Hyper Text UUencode. Somewhat different from regular uuencode.
- ##
- ## Logic taken from Mosaic for X code by Mark Riordan and Ari Luotonen.
- ##
- sub htuu_encode
- {
- local(@in) = unpack("C*", $_[0]);
- local(@out);
-
- push(@in, 0, 0); ## in case we need to round off an odd byte or two
- while (@in >= 3) {
- ##
- ## From the next three input bytes,
- ## construct four encoded output bytes.
- ##
- push(@out, $in[0] >> 2);
- push(@out, (($in[0] << 4) & 060) | (($in[1] >> 4) & 017));
- push(@out, (($in[1] << 2) & 074) | (($in[2] >> 6) & 003));
- push(@out, $in[2] & 077);
- splice(@in, 0, 3); ## remove these three
- }
-
- ##
- ## @out elements are now indices to the string below. Convert to
- ## the appropriate actual text.
- ##
- foreach $new (@out) {
- $new = substr(
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
- $new, 1);
- }
-
- if (@in == 2) {
- ## the two left over are the two extra nulls, so we encoded the proper
- ## amount as-is.
- } elsif (@in == 1) {
- ## We encoded one extra null too many. Undo it.
- $out[$#out] = '=';
- } else {
- ## We must have encoded two nulls... Undo both.
- $out[$#out ] = '=';
- $out[$#out -1] = '=';
- }
-
- join('', @out);
- }
-
- ##
- ## This message stuff really shouldn't be here, but in some seperate library.
- ## Sorry.
- ##
- ## Called as &message(SAVE, TEXT ....), it shoves the text to the screen.
- ## If SAVE is true, bumps the text out as a printed line. Otherwise,
- ## will shove out without a newline so that the next message overwrites it,
- ## or it is clearded via &clear_message().
- ##
- sub message
- {
- local($nl) = shift;
- die "oops $nl." unless $nl =~ m/^\d+$/;
- local($text) = join('', @_);
- local($NL) = $nl ? "\n" : "\r";
- $thislength = length($text);
- if ($thislength >= $last_message_length) {
- print STDERR $text, $NL;
- } else {
- print STDERR $text, ' 'x ($last_message_length-$thislength), $NL;
- }
- $last_message_length = $nl ? 0 : $thislength;
- }
-
- sub clear_message
- {
- if ($last_message_length) {
- print STDERR ' ' x $last_message_length, "\r";
- $last_message_length = 0;
- }
- }
-
- 1;
- __END__
- __END__
- :endofperl
-