/* Handling of recursive HTTP retrieving.
- Copyright (C) 1995, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
+ 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
This file is part of GNU Wget.
GNU Wget is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
GNU Wget is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with Wget; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with Wget. If not, see <http://www.gnu.org/licenses/>.
-#include <config.h>
+Additional permission under GNU GPL version 3 section 7
+
+If you modify this program, or any covered work, by linking or
+combining it with the OpenSSL project's OpenSSL library (or a
+modified version of that library), containing parts covered by the
+terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
+grants you additional permission to convey the resulting work.
+Corresponding Source for a non-source form of such a combination
+shall include the source code for the parts of OpenSSL used as well
+as that of the covered work. */
+
+#include "wget.h"
#include <stdio.h>
#include <stdlib.h>
-#ifdef HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-#endif /* HAVE_STRING_H */
+#include <string.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <errno.h>
#include <assert.h>
-#include <sys/types.h>
-#include "wget.h"
#include "url.h"
#include "recur.h"
#include "utils.h"
#include "retr.h"
#include "ftp.h"
-#include "fnmatch.h"
#include "host.h"
#include "hash.h"
#include "res.h"
+#include "convert.h"
+#include "html-url.h"
+#include "css-url.h"
+#include "spider.h"
-#ifndef errno
-extern int errno;
-#endif
-
-extern char *version_string;
-
-static struct hash_table *dl_file_url_map;
-static struct hash_table *dl_url_file_map;
-
-/* List of HTML files downloaded in this Wget run. Used for link
- conversion after Wget is done. This list should only be traversed
- in order. If you need to check whether a file has been downloaded,
- use a hash table, e.g. dl_file_url_map. */
-static slist *downloaded_html_files;
-\f
/* Functions for maintaining the URL queue. */
struct queue_element {
- const char *url;
- const char *referer;
- int depth;
- struct queue_element *next;
+ const char *url; /* the URL to download */
+ const char *referer; /* the referring document */
+ int depth; /* the depth */
+ bool html_allowed; /* whether the document is allowed to
+ be treated as HTML. */
+ bool css_allowed; /* whether the document is allowed to
+ be treated as CSS. */
+ struct queue_element *next; /* next element in queue */
};
struct url_queue {
static struct url_queue *
url_queue_new (void)
{
- struct url_queue *queue = xmalloc (sizeof (*queue));
- memset (queue, '\0', sizeof (*queue));
+ struct url_queue *queue = xnew0 (struct url_queue);
return queue;
}
static void
url_enqueue (struct url_queue *queue,
- const char *url, const char *referer, int depth)
+ const char *url, const char *referer, int depth,
+ bool html_allowed, bool css_allowed)
{
- struct queue_element *qel = xmalloc (sizeof (*qel));
+ struct queue_element *qel = xnew (struct queue_element);
qel->url = url;
qel->referer = referer;
qel->depth = depth;
+ qel->html_allowed = html_allowed;
+ qel->css_allowed = css_allowed;
qel->next = NULL;
++queue->count;
queue->head = queue->tail;
}
-/* Take a URL out of the queue. Return 1 if this operation succeeded,
- or 0 if the queue is empty. */
+/* Take a URL out of the queue. Return true if this operation
+ succeeded, or false if the queue is empty. */
-static int
+static bool
url_dequeue (struct url_queue *queue,
- const char **url, const char **referer, int *depth)
+ const char **url, const char **referer, int *depth,
+ bool *html_allowed, bool *css_allowed)
{
struct queue_element *qel = queue->head;
if (!qel)
- return 0;
+ return false;
queue->head = queue->head->next;
if (!queue->head)
*url = qel->url;
*referer = qel->referer;
*depth = qel->depth;
+ *html_allowed = qel->html_allowed;
+ *css_allowed = qel->css_allowed;
--queue->count;
DEBUGP (("Queue count %d, maxcount %d.\n", queue->count, queue->maxcount));
xfree (qel);
- return 1;
+ return true;
}
+\f
+static bool download_child_p (const struct urlpos *, struct url *, int,
+ struct url *, struct hash_table *);
+static bool descend_redirect_p (const char *, const char *, int,
+ struct url *, struct hash_table *);
-static int descend_url_p PARAMS ((const struct urlpos *, struct url *, int,
- struct url *, struct hash_table *));
/* Retrieve a part of the web beginning with START_URL. This used to
be called "recursive retrieval", because the old function was
7. if the URL is not one of those downloaded before, and if it
satisfies the criteria specified by the various command-line
- options, add it to the queue. */
+ options, add it to the queue. */
uerr_t
retrieve_tree (const char *start_url)
uerr_t status = RETROK;
/* The queue of URLs we need to load. */
- struct url_queue *queue = url_queue_new ();
+ struct url_queue *queue;
- /* The URLs we decided we don't want to load. */
- struct hash_table *blacklist = make_string_hash_table (0);
+ /* The URLs we do not wish to enqueue, because they are already in
+ the queue, but haven't been downloaded yet. */
+ struct hash_table *blacklist;
- /* We'll need various components of this, so better get it over with
- now. */
- struct url *start_url_parsed = url_parse (start_url, NULL);
+ int up_error_code;
+ struct url *start_url_parsed = url_parse (start_url, &up_error_code);
- url_enqueue (queue, xstrdup (start_url), NULL, 0);
- string_set_add (blacklist, start_url);
+ if (!start_url_parsed)
+ {
+ char *error = url_error (start_url, up_error_code);
+ logprintf (LOG_NOTQUIET, "%s: %s.\n", start_url, error);
+ xfree (error);
+ return URLERROR;
+ }
+
+ queue = url_queue_new ();
+ blacklist = make_string_hash_table (0);
+
+ /* Enqueue the starting URL. Use start_url_parsed->url rather than
+ just URL so we enqueue the canonical form of the URL. */
+ url_enqueue (queue, xstrdup (start_url_parsed->url), NULL, 0, true, false);
+ string_set_add (blacklist, start_url_parsed->url);
while (1)
{
- int descend = 0;
+ bool descend = false;
char *url, *referer, *file = NULL;
int depth;
- boolean dash_p_leaf_HTML = FALSE;
-
- if (downloaded_exceeds_quota ())
- break;
+ bool html_allowed, css_allowed;
+ bool is_css = false;
+ bool dash_p_leaf_HTML = false;
+ if (opt.quota && total_downloaded_bytes > opt.quota)
+ break;
if (status == FWRITEERR)
- break;
+ break;
- /* Get the next URL from the queue. */
+ /* Get the next URL from the queue... */
if (!url_dequeue (queue,
- (const char **)&url, (const char **)&referer,
- &depth))
- break;
-
- /* And download it. */
-
- {
- int dt = 0;
- char *redirected = NULL;
- int oldrec = opt.recursive;
-
- opt.recursive = 0;
- status = retrieve_url (url, &file, &redirected, NULL, &dt);
- opt.recursive = oldrec;
-
- if (redirected)
- {
- xfree (url);
- url = redirected;
- }
- if (file && status == RETROK
- && (dt & RETROKF) && (dt & TEXTHTML))
- descend = 1;
- }
+ (const char **)&url, (const char **)&referer,
+ &depth, &html_allowed, &css_allowed))
+ break;
+
+ /* ...and download it. Note that this download is in most cases
+ unconditional, as download_child_p already makes sure a file
+ doesn't get enqueued twice -- and yet this check is here, and
+ not in download_child_p. This is so that if you run `wget -r
+ URL1 URL2', and a random URL is encountered once under URL1
+ and again under URL2, but at a different (possibly smaller)
+ depth, we want the URL's children to be taken into account
+ the second time. */
+ if (dl_url_file_map && hash_table_contains (dl_url_file_map, url))
+ {
+ file = xstrdup (hash_table_get (dl_url_file_map, url));
+
+ DEBUGP (("Already downloaded \"%s\", reusing it from \"%s\".\n",
+ url, file));
+
+ /* this sucks, needs to be combined! */
+ if (html_allowed
+ && downloaded_html_set
+ && string_set_contains (downloaded_html_set, file))
+ {
+ descend = true;
+ is_css = false;
+ }
+ if (css_allowed
+ && downloaded_css_set
+ && string_set_contains (downloaded_css_set, file))
+ {
+ descend = true;
+ is_css = true;
+ }
+ }
+ else
+ {
+ int dt = 0;
+ char *redirected = NULL;
+
+ status = retrieve_url (url, &file, &redirected, referer, &dt, false);
+
+ if (html_allowed && file && status == RETROK
+ && (dt & RETROKF) && (dt & TEXTHTML))
+ {
+ descend = true;
+ is_css = false;
+ }
+
+ /* a little different, css_allowed can override content type
+ lots of web servers serve css with an incorrect content type
+ */
+ if (file && status == RETROK
+ && (dt & RETROKF) &&
+ ((dt & TEXTCSS) || css_allowed))
+ {
+ descend = true;
+ is_css = true;
+ }
+
+ if (redirected)
+ {
+ /* We have been redirected, possibly to another host, or
+ different path, or wherever. Check whether we really
+ want to follow it. */
+ if (descend)
+ {
+ if (!descend_redirect_p (redirected, url, depth,
+ start_url_parsed, blacklist))
+ descend = false;
+ else
+ /* Make sure that the old pre-redirect form gets
+ blacklisted. */
+ string_set_add (blacklist, url);
+ }
+
+ xfree (url);
+ url = redirected;
+ }
+ }
+
+ if (opt.spider)
+ {
+ visited_url (url, referer);
+ }
if (descend
- && depth >= opt.reclevel && opt.reclevel != INFINITE_RECURSION)
- {
- if (opt.page_requisites && depth == opt.reclevel)
- /* When -p is specified, we can do one more partial
- recursion from the "leaf nodes" on the HTML document
- tree. The recursion is partial in that we won't
- traverse any <A> or <AREA> tags, nor any <LINK> tags
- except for <LINK REL="stylesheet">. */
- /* #### This would be the place to implement the TODO
- entry saying that -p should do two more hops on
- framesets. */
- dash_p_leaf_HTML = TRUE;
- else
- {
- /* Either -p wasn't specified or it was and we've
- already gone the one extra (pseudo-)level that it
- affords us, so we need to bail out. */
- DEBUGP (("Not descending further; at depth %d, max. %d.\n",
- depth, opt.reclevel));
- descend = 0;
- }
- }
-
- /* If the downloaded document was HTML, parse it and enqueue the
- links it contains. */
+ && depth >= opt.reclevel && opt.reclevel != INFINITE_RECURSION)
+ {
+ if (opt.page_requisites
+ && (depth == opt.reclevel || depth == opt.reclevel + 1))
+ {
+ /* When -p is specified, we are allowed to exceed the
+ maximum depth, but only for the "inline" links,
+ i.e. those that are needed to display the page.
+ Originally this could exceed the depth at most by
+ one, but we allow one more level so that the leaf
+ pages that contain frames can be loaded
+ correctly. */
+ dash_p_leaf_HTML = true;
+ }
+ else
+ {
+ /* Either -p wasn't specified or it was and we've
+ already spent the two extra (pseudo-)levels that it
+ affords us, so we need to bail out. */
+ DEBUGP (("Not descending further; at depth %d, max. %d.\n",
+ depth, opt.reclevel));
+ descend = false;
+ }
+ }
+
+ /* If the downloaded document was HTML or CSS, parse it and enqueue the
+ links it contains. */
if (descend)
- {
- int meta_disallow_follow = 0;
- struct urlpos *children = get_urls_html (file, url, dash_p_leaf_HTML,
- &meta_disallow_follow);
-
- if (opt.use_robots && meta_disallow_follow)
- {
- free_urlpos (children);
- children = NULL;
- }
-
- if (children)
- {
- struct urlpos *child = children;
- struct url *url_parsed = url_parsed = url_parse (url, NULL);
- assert (url_parsed != NULL);
-
- for (; child; child = child->next)
- {
- if (descend_url_p (child, url_parsed, depth, start_url_parsed,
- blacklist))
- {
- url_enqueue (queue, xstrdup (child->url->url),
- xstrdup (url), depth + 1);
- /* We blacklist the URL we have enqueued, because we
- don't want to enqueue (and hence download) the
- same URL twice. */
- string_set_add (blacklist, child->url->url);
- }
- }
-
- url_free (url_parsed);
- free_urlpos (children);
- }
- }
-
- if (opt.delete_after || (file && !acceptable (file)))
- {
- /* Either --delete-after was specified, or we loaded this
- otherwise rejected (e.g. by -R) HTML file just so we
- could harvest its hyperlinks -- in either case, delete
- the local file. */
- DEBUGP (("Removing file due to %s in recursive_retrieve():\n",
- opt.delete_after ? "--delete-after" :
- "recursive rejection criteria"));
- logprintf (LOG_VERBOSE,
- (opt.delete_after ? _("Removing %s.\n")
- : _("Removing %s since it should be rejected.\n")),
- file);
- if (unlink (file))
- logprintf (LOG_NOTQUIET, "unlink: %s\n", strerror (errno));
- }
+ {
+ bool meta_disallow_follow = false;
+ struct urlpos *children
+ = is_css ? get_urls_css_file (file, url) :
+ get_urls_html (file, url, &meta_disallow_follow);
+
+ if (opt.use_robots && meta_disallow_follow)
+ {
+ free_urlpos (children);
+ children = NULL;
+ }
+
+ if (children)
+ {
+ struct urlpos *child = children;
+ struct url *url_parsed = url_parsed = url_parse (url, NULL);
+ char *referer_url = url;
+ bool strip_auth = (url_parsed != NULL
+ && url_parsed->user != NULL);
+ assert (url_parsed != NULL);
+
+ /* Strip auth info if present */
+ if (strip_auth)
+ referer_url = url_string (url_parsed, URL_AUTH_HIDE);
+
+ for (; child; child = child->next)
+ {
+ if (child->ignore_when_downloading)
+ continue;
+ if (dash_p_leaf_HTML && !child->link_inline_p)
+ continue;
+ if (download_child_p (child, url_parsed, depth, start_url_parsed,
+ blacklist))
+ {
+ url_enqueue (queue, xstrdup (child->url->url),
+ xstrdup (referer_url), depth + 1,
+ child->link_expect_html,
+ child->link_expect_css);
+ /* We blacklist the URL we have enqueued, because we
+ don't want to enqueue (and hence download) the
+ same URL twice. */
+ string_set_add (blacklist, child->url->url);
+ }
+ }
+
+ if (strip_auth)
+ xfree (referer_url);
+ url_free (url_parsed);
+ free_urlpos (children);
+ }
+ }
+
+ if (file
+ && (opt.delete_after
+ || opt.spider /* opt.recursive is implicitely true */
+ || !acceptable (file)))
+ {
+ /* Either --delete-after was specified, or we loaded this
+ (otherwise unneeded because of --spider or rejected by -R)
+ HTML file just to harvest its hyperlinks -- in either case,
+ delete the local file. */
+ DEBUGP (("Removing file due to %s in recursive_retrieve():\n",
+ opt.delete_after ? "--delete-after" :
+ (opt.spider ? "--spider" :
+ "recursive rejection criteria")));
+ logprintf (LOG_VERBOSE,
+ (opt.delete_after || opt.spider
+ ? _("Removing %s.\n")
+ : _("Removing %s since it should be rejected.\n")),
+ file);
+ if (unlink (file))
+ logprintf (LOG_NOTQUIET, "unlink: %s\n", strerror (errno));
+ logputs (LOG_VERBOSE, "\n");
+ register_delete_file (file);
+ }
xfree (url);
- FREE_MAYBE (referer);
- FREE_MAYBE (file);
+ xfree_null (referer);
+ xfree_null (file);
}
/* If anything is left of the queue due to a premature exit, free it
{
char *d1, *d2;
int d3;
- while (url_dequeue (queue, (const char **)&d1, (const char **)&d2, &d3))
+ bool d4, d5;
+ while (url_dequeue (queue,
+ (const char **)&d1, (const char **)&d2, &d3, &d4, &d5))
{
- xfree (d1);
- FREE_MAYBE (d2);
+ xfree (d1);
+ xfree_null (d2);
}
}
url_queue_delete (queue);
url_free (start_url_parsed);
string_set_free (blacklist);
- if (downloaded_exceeds_quota ())
+ if (opt.quota && total_downloaded_bytes > opt.quota)
return QUOTEXC;
else if (status == FWRITEERR)
return FWRITEERR;
/* Based on the context provided by retrieve_tree, decide whether a
URL is to be descended to. This is only ever called from
- retrieve_tree, but is in a separate function for clarity. */
+ retrieve_tree, but is in a separate function for clarity.
+
+ The most expensive checks (such as those for robots) are memoized
+ by storing these URLs to BLACKLIST. This may or may not help. It
+ will help if those URLs are encountered many times. */
-static int
-descend_url_p (const struct urlpos *upos, struct url *parent, int depth,
- struct url *start_url_parsed, struct hash_table *blacklist)
+static bool
+download_child_p (const struct urlpos *upos, struct url *parent, int depth,
+ struct url *start_url_parsed, struct hash_table *blacklist)
{
struct url *u = upos->url;
const char *url = u->url;
+ bool u_scheme_like_http;
DEBUGP (("Deciding whether to enqueue \"%s\".\n", url));
if (string_set_contains (blacklist, url))
{
+ if (opt.spider)
+ {
+ char *referrer = url_string (parent, URL_AUTH_HIDE_PASSWD);
+ DEBUGP (("download_child_p: parent->url is: %s\n", quote (parent->url)));
+ visited_url (url, referrer);
+ xfree (referrer);
+ }
DEBUGP (("Already on the black list.\n"));
goto out;
}
More time- and memory- consuming tests should be put later on
the list. */
+ /* Determine whether URL under consideration has a HTTP-like scheme. */
+ u_scheme_like_http = schemes_are_similar_p (u->scheme, SCHEME_HTTP);
+
/* 1. Schemes other than HTTP are normally not recursed into. */
- if (u->scheme != SCHEME_HTTP
- && !(u->scheme == SCHEME_FTP && opt.follow_ftp))
+ if (!u_scheme_like_http && !(u->scheme == SCHEME_FTP && opt.follow_ftp))
{
DEBUGP (("Not following non-HTTP schemes.\n"));
- goto blacklist;
+ goto out;
}
/* 2. If it is an absolute link and they are not followed, throw it
out. */
- if (u->scheme == SCHEME_HTTP)
+ if (u_scheme_like_http)
if (opt.relative_only && !upos->link_relative_p)
{
- DEBUGP (("It doesn't really look like a relative link.\n"));
- goto blacklist;
+ DEBUGP (("It doesn't really look like a relative link.\n"));
+ goto out;
}
/* 3. If its domain is not to be accepted/looked-up, chuck it
if (!accept_domain (u))
{
DEBUGP (("The domain was not accepted.\n"));
- goto blacklist;
+ goto out;
}
/* 4. Check for parent directory.
If we descended to a different host or changed the scheme, ignore
- opt.no_parent. Also ignore it for -p leaf retrievals. */
+ opt.no_parent. Also ignore it for documents needed to display
+ the parent page when in -p mode. */
if (opt.no_parent
- && u->scheme == parent->scheme
- && 0 == strcasecmp (u->host, parent->host)
- && u->port == parent->port)
+ && schemes_are_similar_p (u->scheme, start_url_parsed->scheme)
+ && 0 == strcasecmp (u->host, start_url_parsed->host)
+ && u->port == start_url_parsed->port
+ && !(opt.page_requisites && upos->link_inline_p))
{
- if (!frontcmp (parent->dir, u->dir))
- {
- DEBUGP (("Trying to escape the root directory with no_parent in effect.\n"));
- goto blacklist;
- }
+ if (!subdir_p (start_url_parsed->dir, u->dir))
+ {
+ DEBUGP (("Going to \"%s\" would escape \"%s\" with no_parent on.\n",
+ u->dir, start_url_parsed->dir));
+ goto out;
+ }
}
/* 5. If the file does not match the acceptance list, or is on the
exclusion and inclusion lists. */
if (opt.includes || opt.excludes)
{
- if (!accdir (u->dir, ALLABS))
- {
- DEBUGP (("%s (%s) is excluded/not-included.\n", url, u->dir));
- goto blacklist;
- }
+ if (!accdir (u->dir))
+ {
+ DEBUGP (("%s (%s) is excluded/not-included.\n", url, u->dir));
+ goto out;
+ }
}
- /* 6. */
- {
- char *suf = NULL;
- /* Check for acceptance/rejection rules. We ignore these rules
- for HTML documents because they might lead to other files which
- need to be downloaded. Of course, we don't know which
- documents are HTML before downloading them, so we guess.
-
- A file is subject to acceptance/rejection rules if:
-
- * u->file is not "" (i.e. it is not a directory)
- and either:
- + there is no file suffix,
- + or there is a suffix, but is not "html" or "htm",
- + both:
- - recursion is not infinite,
- - and we are at its very end. */
-
- if (u->file[0] != '\0'
- && ((suf = suffix (url)) == NULL
- || (0 != strcmp (suf, "html") && 0 != strcmp (suf, "htm"))
- || (opt.reclevel == INFINITE_RECURSION && depth >= opt.reclevel)))
- {
- if (!acceptable (u->file))
- {
- DEBUGP (("%s (%s) does not match acc/rej rules.\n",
- url, u->file));
- FREE_MAYBE (suf);
- goto blacklist;
- }
- }
- FREE_MAYBE (suf);
- }
+ /* 6. Check for acceptance/rejection rules. We ignore these rules
+ for directories (no file name to match) and for non-leaf HTMLs,
+ which can lead to other files that do need to be downloaded. (-p
+ automatically implies non-leaf because with -p we can, if
+ necesary, overstep the maximum depth to get the page requisites.) */
+ if (u->file[0] != '\0'
+ && !(has_html_suffix_p (u->file)
+ /* The exception only applies to non-leaf HTMLs (but -p
+ always implies non-leaf because we can overstep the
+ maximum depth to get the requisites): */
+ && (/* non-leaf */
+ opt.reclevel == INFINITE_RECURSION
+ /* also non-leaf */
+ || depth < opt.reclevel - 1
+ /* -p, which implies non-leaf (see above) */
+ || opt.page_requisites)))
+ {
+ if (!acceptable (u->file))
+ {
+ DEBUGP (("%s (%s) does not match acc/rej rules.\n",
+ url, u->file));
+ goto out;
+ }
+ }
/* 7. */
- if (u->scheme == parent->scheme)
+ if (schemes_are_similar_p (u->scheme, parent->scheme))
if (!opt.spanhost && 0 != strcasecmp (parent->host, u->host))
{
- DEBUGP (("This is not the same hostname as the parent's (%s and %s).\n",
- u->host, parent->host));
- goto blacklist;
+ DEBUGP (("This is not the same hostname as the parent's (%s and %s).\n",
+ u->host, parent->host));
+ goto out;
}
/* 8. */
- if (opt.use_robots && u->scheme == SCHEME_HTTP)
+ if (opt.use_robots && u_scheme_like_http)
{
struct robot_specs *specs = res_get_specs (u->host, u->port);
if (!specs)
- {
- char *rfile;
- if (res_retrieve_file (url, &rfile))
- {
- specs = res_parse_from_file (rfile);
- xfree (rfile);
- }
- else
- {
- /* If we cannot get real specs, at least produce
- dummy ones so that we can register them and stop
- trying to retrieve them. */
- specs = res_parse ("", 0);
- }
- res_register_specs (u->host, u->port, specs);
- }
+ {
+ char *rfile;
+ if (res_retrieve_file (url, &rfile))
+ {
+ specs = res_parse_from_file (rfile);
+
+ /* Delete the robots.txt file if we chose to either delete the
+ files after downloading or we're just running a spider. */
+ if (opt.delete_after || opt.spider)
+ {
+ logprintf (LOG_VERBOSE, "Removing %s.\n", rfile);
+ if (unlink (rfile))
+ logprintf (LOG_NOTQUIET, "unlink: %s\n",
+ strerror (errno));
+ }
+
+ xfree (rfile);
+ }
+ else
+ {
+ /* If we cannot get real specs, at least produce
+ dummy ones so that we can register them and stop
+ trying to retrieve them. */
+ specs = res_parse ("", 0);
+ }
+ res_register_specs (u->host, u->port, specs);
+ }
/* Now that we have (or don't have) robots.txt specs, we can
- check what they say. */
+ check what they say. */
if (!res_match_path (specs, u->path))
- {
- DEBUGP (("Not following %s because robots.txt forbids it.\n", url));
- goto blacklist;
- }
+ {
+ DEBUGP (("Not following %s because robots.txt forbids it.\n", url));
+ string_set_add (blacklist, url);
+ goto out;
+ }
}
/* The URL has passed all the tests. It can be placed in the
download queue. */
DEBUGP (("Decided to load it.\n"));
- return 1;
-
- blacklist:
- string_set_add (blacklist, url);
+ return true;
out:
DEBUGP (("Decided NOT to load it.\n"));
- return 0;
-}
-\f
-/* Register that URL has been successfully downloaded to FILE. */
-
-void
-register_download (const char *url, const char *file)
-{
- if (!opt.convert_links)
- return;
- if (!dl_file_url_map)
- dl_file_url_map = make_string_hash_table (0);
- if (!dl_url_file_map)
- dl_url_file_map = make_string_hash_table (0);
-
- if (!hash_table_contains (dl_file_url_map, file))
- hash_table_put (dl_file_url_map, xstrdup (file), xstrdup (url));
- if (!hash_table_contains (dl_url_file_map, url))
- hash_table_put (dl_url_file_map, xstrdup (url), xstrdup (file));
-}
-
-/* Register that FROM has been redirected to TO. This assumes that TO
- is successfully downloaded and already registered using
- register_download() above. */
-
-void
-register_redirection (const char *from, const char *to)
-{
- char *file;
-
- if (!opt.convert_links)
- return;
-
- file = hash_table_get (dl_url_file_map, to);
- assert (file != NULL);
- if (!hash_table_contains (dl_url_file_map, from))
- hash_table_put (dl_url_file_map, xstrdup (from), xstrdup (file));
+ return false;
}
-/* Register that URL corresponds to the HTML file FILE. */
+/* This function determines whether we will consider downloading the
+ children of a URL whose download resulted in a redirection,
+ possibly to another host, etc. It is needed very rarely, and thus
+ it is merely a simple-minded wrapper around download_child_p. */
-void
-register_html (const char *url, const char *file)
+static bool
+descend_redirect_p (const char *redirected, const char *original, int depth,
+ struct url *start_url_parsed, struct hash_table *blacklist)
{
- if (!opt.convert_links)
- return;
- downloaded_html_files = slist_prepend (downloaded_html_files, file);
-}
+ struct url *orig_parsed, *new_parsed;
+ struct urlpos *upos;
+ bool success;
-/* convert_links() is called from recursive_retrieve() after we're
- done with an HTML file. This call to convert_links is not complete
- because it converts only the downloaded files, and Wget cannot know
- which files will be downloaded afterwards. So, if we have file
- fileone.html with:
+ orig_parsed = url_parse (original, NULL);
+ assert (orig_parsed != NULL);
- <a href="/c/something.gif">
+ new_parsed = url_parse (redirected, NULL);
+ assert (new_parsed != NULL);
- and /c/something.gif was not downloaded because it exceeded the
- recursion depth, the reference will *not* be changed.
+ upos = xnew0 (struct urlpos);
+ upos->url = new_parsed;
- However, later we can encounter /c/something.gif from an "upper"
- level HTML (let's call it filetwo.html), and it gets downloaded.
+ success = download_child_p (upos, orig_parsed, depth,
+ start_url_parsed, blacklist);
- But now we have a problem because /c/something.gif will be
- correctly transformed in filetwo.html, but not in fileone.html,
- since Wget could not have known that /c/something.gif will be
- downloaded in the future.
+ url_free (orig_parsed);
+ url_free (new_parsed);
+ xfree (upos);
- This is why Wget must, after the whole retrieval, call
- convert_all_links to go once more through the entire list of
- retrieved HTMLs, and re-convert them.
+ if (!success)
+ DEBUGP (("Redirection \"%s\" failed the test.\n", redirected));
- All the downloaded HTMLs are kept in downloaded_html_files, and downloaded URLs
- in urls_downloaded. From these two lists information is
- extracted. */
-void
-convert_all_links (void)
-{
- slist *html;
-
- /* Destructively reverse downloaded_html_files to get it in the right order.
- recursive_retrieve() used slist_prepend() consistently. */
- downloaded_html_files = slist_nreverse (downloaded_html_files);
-
- for (html = downloaded_html_files; html; html = html->next)
- {
- struct urlpos *urls, *cur_url;
- char *url;
-
- DEBUGP (("Rescanning %s\n", html->string));
-
- /* Determine the URL of the HTML file. get_urls_html will need
- it. */
- url = hash_table_get (dl_file_url_map, html->string);
- if (url)
- DEBUGP (("It should correspond to %s.\n", url));
- else
- DEBUGP (("I cannot find the corresponding URL.\n"));
-
- /* Parse the HTML file... */
- urls = get_urls_html (html->string, url, FALSE, NULL);
-
- /* We don't respect meta_disallow_follow here because, even if
- the file is not followed, we might still want to convert the
- links that have been followed from other files. */
-
- for (cur_url = urls; cur_url; cur_url = cur_url->next)
- {
- char *local_name;
- struct url *u = cur_url->url;
-
- /* We decide the direction of conversion according to whether
- a URL was downloaded. Downloaded URLs will be converted
- ABS2REL, whereas non-downloaded will be converted REL2ABS. */
- local_name = hash_table_get (dl_url_file_map, u->url);
- if (local_name)
- DEBUGP (("%s marked for conversion, local %s\n",
- u->url, local_name));
-
- /* Decide on the conversion direction. */
- if (local_name)
- {
- /* We've downloaded this URL. Convert it to relative
- form. We do this even if the URL already is in
- relative form, because our directory structure may
- not be identical to that on the server (think `-nd',
- `--cut-dirs', etc.) */
- cur_url->convert = CO_CONVERT_TO_RELATIVE;
- cur_url->local_name = xstrdup (local_name);
- }
- else
- {
- /* We haven't downloaded this URL. If it's not already
- complete (including a full host name), convert it to
- that form, so it can be reached while browsing this
- HTML locally. */
- if (!cur_url->link_complete_p)
- cur_url->convert = CO_CONVERT_TO_COMPLETE;
- cur_url->local_name = NULL;
- }
- }
- /* Convert the links in the file. */
- convert_links (html->string, urls);
- /* Free the data. */
- free_urlpos (urls);
- }
+ return success;
}
-/* Cleanup the data structures associated with recursive retrieving
- (the variables above). */
-void
-recursive_cleanup (void)
-{
- if (dl_file_url_map)
- {
- free_keys_and_values (dl_file_url_map);
- hash_table_destroy (dl_file_url_map);
- dl_file_url_map = NULL;
- }
- if (dl_url_file_map)
- {
- free_keys_and_values (dl_url_file_map);
- hash_table_destroy (dl_url_file_map);
- dl_url_file_map = NULL;
- }
- slist_free (downloaded_html_files);
- downloaded_html_files = NULL;
-}
+/* vim:set sts=2 sw=2 cino+={s: */