Implementation of fetching of data from a URL. More...

#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <libwapcaplet/libwapcaplet.h>
#include "utils/config.h"
#include "utils/corestrings.h"
#include "utils/nsoption.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/nsurl.h"
#include "utils/ring.h"
#include "netsurf/misc.h"
#include "desktop/gui_internal.h"
#include "content/fetch.h"
#include "content/fetchers.h"
#include "content/fetchers/resource.h"
#include "content/fetchers/about/about.h"
#include "content/fetchers/curl.h"
#include "content/fetchers/data.h"
#include "content/fetchers/file/file.h"
#include "javascript/fetcher.h"
#include "content/urldb.h"

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Data Structures
struct	scheme_fetcher_s
	Information about a fetcher for a given scheme. More...

struct	fetch
	Information for a single fetch. More...

Macros
#define	MAX_FETCHERS 10
	The maximum number of fetchers that can be added. More...

#define	SCHEDULE_TIME 10
	The time in ms between polling the fetchers. More...

#define	FDSET_TIMEOUT 1000
	The fdset timeout in ms. More...

Typedefs
typedef struct scheme_fetcher_s	scheme_fetcher
	Information about a fetcher for a given scheme. More...

Functions
static void	fetch_ref_fetcher (int fetcherd)

static void	fetch_unref_fetcher (int fetcherd)

static int	get_fetcher_for_scheme (lwc_string *scheme)
	Find a suitable fetcher for a scheme. More...

static bool	fetch_dispatch_job (struct fetch *fetch)
	Dispatch a single job. More...

static bool	fetch_choose_and_dispatch (void)
	Choose and dispatch a single job. More...

static void	dump_rings (void)

static bool	fetch_dispatch_jobs (void)
	Dispatch as many jobs as we have room to dispatch. More...

static void	fetcher_poll (void *unused)

nserror	fetcher_init (void)
	Initialise all registered fetchers. More...

void	fetcher_quit (void)
	Clean up for quit. More...

nserror	fetcher_add (lwc_string scheme, const struct fetcher_operation_table ops)
	Register a fetcher for a scheme. More...

nserror	fetch_fdset (fd_set read_fd_set, fd_set write_fd_set, fd_set except_fd_set, int maxfd_out)
	Get the set of file descriptors the fetchers are currently using. More...

nserror	fetch_start (nsurl url, nsurl referer, fetch_callback callback, void p, bool only_2xx, const char post_urlenc, const struct fetch_multipart_data post_multipart, bool verifiable, bool downgrade_tls, const char headers[], struct fetch **fetch_out)
	Start fetching data for the given URL. More...

void	fetch_abort (struct fetch *f)
	Abort a fetch. More...

void	fetch_free (struct fetch *f)
	Free a fetch structure and associated resources. More...

bool	fetch_can_fetch (const nsurl *url)
	Check if a URL's scheme can be fetched. More...

void	fetch_change_callback (struct fetch fetch, fetch_callback callback, void p)
	Change the callback function for a fetch. More...

long	fetch_http_code (struct fetch *fetch)
	Get the HTTP response code. More...

struct fetch_multipart_data *	fetch_multipart_data_clone (const struct fetch_multipart_data *list)
	Clone a linked list of fetch_multipart_data. More...

const char *	fetch_multipart_data_find (const struct fetch_multipart_data list, const char name)
	Find an entry in a fetch_multipart_data. More...

void	fetch_multipart_data_destroy (struct fetch_multipart_data *list)
	Free a linked list of fetch_multipart_data. More...

nserror	fetch_multipart_data_new_kv (struct fetch_multipart_data *list, const char name, const char *value)
	Create an entry for a fetch_multipart_data. More...

void	fetch_send_callback (const fetch_msg msg, struct fetch fetch)
	send message to fetch More...

void	fetch_remove_from_queues (struct fetch *fetch)
	remove a queued fetch More...

void	fetch_set_http_code (struct fetch *fetch, long http_code)
	set the http code of a fetch More...

void	fetch_set_cookie (struct fetch fetch, const char data)
	set cookie data on a fetch More...

Variables
static scheme_fetcher	fetchers [MAX_FETCHERS]

static struct fetch *	fetch_ring = NULL
	Ring of active fetches. More...

static struct fetch *	queue_ring = NULL
	Ring of queued fetches. More...

Detailed Description

Implementation of fetching of data from a URL.

The implementation is the fetch factory and the generic operations around the fetcher specific methods.

Active fetches are held in the circular linked list fetch_ring. There may be at most nsoption max_fetchers_per_host active requests per Host: header. There may be at most nsoption max_fetchers active requests overall. Inactive fetches are stored in the queue_ring waiting for use.

Definition in file fetch.c.

Macro Definition Documentation

◆ FDSET_TIMEOUT

#define FDSET_TIMEOUT 1000

The fdset timeout in ms.

Definition at line 74 of file fetch.c.

◆ MAX_FETCHERS

#define MAX_FETCHERS 10

The maximum number of fetchers that can be added.

Definition at line 64 of file fetch.c.

◆ SCHEDULE_TIME

#define SCHEDULE_TIME 10

The time in ms between polling the fetchers.

Todo:: The schedule timeout should be profiled to see if there is a better value or even if it needs to be dynamic.

Definition at line 71 of file fetch.c.

Typedef Documentation

◆ scheme_fetcher

typedef struct scheme_fetcher_s scheme_fetcher

Information about a fetcher for a given scheme.

Function Documentation

◆ dump_rings()

static void dump_rings ( void )

static

Definition at line 203 of file fetch.c.

References fetch_ring, NSLOG, nsurl_access(), queue_ring, fetch::r_next, and fetch::url.

Referenced by fetch_dispatch_jobs().

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◆ fetch_abort()

void fetch_abort ( struct fetch * f )

Abort a fetch.

Definition at line 537 of file fetch.c.

References fetcher_operation_table::abort, FETCH__INTERNAL_ABORTED, fetch::fetcher_handle, fetch::fetcherd, fetchers, fetch::last_msg, NSLOG, nsurl_access(), scheme_fetcher_s::ops, and fetch::url.

Referenced by llcache_fetch_auth(), llcache_fetch_callback(), llcache_fetch_notmodified(), llcache_fetch_redirect(), llcache_handle_abort(), and llcache_object_destroy().

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◆ fetch_can_fetch()

bool fetch_can_fetch ( const nsurl * url )

Check if a URL's scheme can be fetched.

Parameters

url	URL to check

Returns: true if the scheme is supported

Definition at line 586 of file fetch.c.

References fetcher_operation_table::acceptable, fetch::fetcherd, fetchers, get_fetcher_for_scheme(), nsurl_get_component(), NSURL_SCHEME, scheme_fetcher_s::ops, and fetch::url.

Referenced by llcache_fetch_redirect(), llcache_handle_retrieve(), ro_uri_message_received(), and ro_url_message_received().

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◆ fetch_change_callback()

void fetch_change_callback	(	struct fetch *	fetch,
		fetch_callback	callback,
		void *	p
	)

Change the callback function for a fetch.

Definition at line 602 of file fetch.c.

References fetch::callback, and fetch::p.

◆ fetch_choose_and_dispatch()

static bool fetch_choose_and_dispatch ( void )

static

Choose and dispatch a single job.

Return false if we failed to dispatch anything.

We don't check the overall dispatch size here because we're not called unless there is room in the fetch queue for us.

Definition at line 173 of file fetch.c.

References fetch_dispatch_job(), fetch_ring, fetch::host, nsoption_int, queue_ring, fetch::r_next, and RING_COUNTBYLWCHOST.

Referenced by fetch_dispatch_jobs().

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◆ fetch_dispatch_job()

static bool fetch_dispatch_job ( struct fetch * fetch )

static

Dispatch a single job.

Definition at line 148 of file fetch.c.

References fetch::fetch_is_active, fetch_ring, fetch::fetcher_handle, fetch::fetcherd, fetchers, NSLOG, nsurl_access(), scheme_fetcher_s::ops, queue_ring, RING_INSERT, RING_REMOVE, fetcher_operation_table::start, and fetch::url.

Referenced by fetch_choose_and_dispatch().

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◆ fetch_dispatch_jobs()

static bool fetch_dispatch_jobs ( void )

static

Dispatch as many jobs as we have room to dispatch.

Returns: true if there are active fetchers that require polling else false.

Definition at line 231 of file fetch.c.

References dump_rings(), fetch_choose_and_dispatch(), fetch_ring, NSLOG, nsoption_int, queue_ring, and RING_GETSIZE.

Referenced by fetch_fdset(), fetch_start(), and fetcher_poll().

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◆ fetch_fdset()

nserror fetch_fdset	(	fd_set *	read_fd_set,
		fd_set *	write_fd_set,
		fd_set *	except_fd_set,
		int *	maxfd
	)

Get the set of file descriptors the fetchers are currently using.

This obtains the file descriptors the fetch system is using to obtain data. It will cause the fetchers to make progress, if possible, potentially completing fetches before requiring activity on file descriptors.

If a set of descriptors is returned (maxfd is not -1) The caller is expected to wait on them (with select etc.) and continue to obtain the fdset with this call. This will switch the fetchers from polled mode to waiting for network activity which is much more efficient.

Note: If the caller does not subsequently obtain the fdset again the fetchers will fall back to the less efficient polled operation. The fallback to polled operation will only occour after a timeout which introduces additional delay.

Parameters

[out]	read_fd_set	The fd set for read.
[out]	write_fd_set	The fd set for write.
[out]	except_fd_set	The fd set for exceptions.
[out]	maxfd	The highest fd number in the set or -1 if no fd available.

Returns: NSERROR_OK on success or appropriate error code.

Note: adjusting the schedule time is only done for curl currently. This is because as it is assumed to be the only fetcher that can possibly have fd to select on. All the other fetchers continue to need polling frequently.

Definition at line 385 of file fetch.c.

References fetcher_operation_table::fdset, FDSET_TIMEOUT, fetch_dispatch_jobs(), fetcher_poll(), fetch::fetcherd, fetchers, guit, MAX_FETCHERS, netsurf_table::misc, NSERROR_OK, NSLOG, scheme_fetcher_s::ops, fetcher_operation_table::poll, and gui_misc_table::schedule.

Referenced by ami_get_msg(), monkey_run(), nsbeos_gui_poll(), and nsgtk_main().

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◆ fetch_free()

void fetch_free ( struct fetch * f )

Free a fetch structure and associated resources.

Definition at line 548 of file fetch.c.

References fetch_msg::data, fetch_msg::error, FETCH_ERROR, FETCH_MIN_FINISHED_MSG, fetch_send_callback(), fetch_unref_fetcher(), fetch::fetcher_handle, fetch::fetcherd, fetchers, fetcher_operation_table::free, fetch::host, fetch::last_msg, NSLOG, nsurl_access(), nsurl_unref(), scheme_fetcher_s::ops, fetch::referer, fetch_msg::type, and fetch::url.

Referenced by fetch_curl_abort(), fetch_curl_done(), fetch_data_poll(), fetch_file_poll(), fetch_javascript_poll(), fetch_resource_poll(), fetch_rsrc_poll(), and html_css_fetcher_poll().

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◆ fetch_http_code()

long fetch_http_code ( struct fetch * fetch )

Get the HTTP response code.

Definition at line 612 of file fetch.c.

References fetch::http_code.

Referenced by llcache_fetch_process_data(), and llcache_fetch_redirect().

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◆ fetch_multipart_data_clone()

struct fetch_multipart_data * fetch_multipart_data_clone ( const struct fetch_multipart_data * list )

Clone a linked list of fetch_multipart_data.

Parameters

list	List to clone

Returns: Pointer to head of cloned list, or NULL on failure

Definition at line 620 of file fetch.c.

References fetch_multipart_data_destroy(), fetch_multipart_data::file, fetch_multipart_data::name, fetch_multipart_data::next, fetch_multipart_data::rawfile, result, and fetch_multipart_data::value.

Referenced by browser_window_navigate(), fetch_curl_alloc_postdata(), and llcache_post_data_clone().

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◆ fetch_multipart_data_destroy()

void fetch_multipart_data_destroy ( struct fetch_multipart_data * list )

Free a linked list of fetch_multipart_data.

Parameters

list	Pointer to head of list to free

Definition at line 701 of file fetch.c.

References fetch_multipart_data::file, fetch_multipart_data::name, fetch_multipart_data::next, NSLOG, fetch_multipart_data::rawfile, and fetch_multipart_data::value.

Referenced by browser_window__free_fetch_parameters(), browser_window__reload_current_parameters(), fetch_curl_free_postdata(), fetch_multipart_data_clone(), form_dom_to_data(), form_submit(), and llcache_object_destroy().

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◆ fetch_multipart_data_find()

const char * fetch_multipart_data_find	(	const struct fetch_multipart_data *	list,
		const char *	name
	)

Find an entry in a fetch_multipart_data.

Parameters

list	Pointer to the multipart list
name	The name to look for in the list

Returns: The value found, or NULL if not present

Definition at line 686 of file fetch.c.

References fetch_multipart_data::name, fetch_multipart_data::next, and fetch_multipart_data::value.

Referenced by navigate_internal_query_auth(), navigate_internal_query_fetcherror(), navigate_internal_query_ssl(), and navigate_internal_query_timeout().

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◆ fetch_multipart_data_new_kv()

nserror fetch_multipart_data_new_kv	(	struct fetch_multipart_data **	list,
		const char *	name,
		const char *	value
	)

Create an entry for a fetch_multipart_data.

If an entry exists of the same name, it will NOT be overwritten

Parameters

list	Pointer to the pointer to the current multipart list
name	The name of the entry to create
value	The value of the entry to create

Returns: The result of the attempt

Definition at line 721 of file fetch.c.

References fetch_multipart_data::name, fetch_multipart_data::next, NSERROR_NOMEM, NSERROR_OK, and fetch_multipart_data::value.

Referenced by browser_window__handle_bad_certs(), browser_window__handle_fetcherror(), browser_window__handle_login(), and browser_window__handle_timeout().

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◆ fetch_ref_fetcher()

static void fetch_ref_fetcher ( int fetcherd )

inlinestatic

Definition at line 112 of file fetch.c.

References fetch::fetcherd, fetchers, and scheme_fetcher_s::refcount.

Referenced by fetch_start(), and fetcher_add().

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◆ fetch_remove_from_queues()

void fetch_remove_from_queues ( struct fetch * fetch )

remove a queued fetch

Definition at line 767 of file fetch.c.

References fetch::fetch_is_active, fetch_ring, fetch::fetcher_handle, NSLOG, queue_ring, RING_GETSIZE, and RING_REMOVE.

Referenced by fetch_curl_abort(), fetch_curl_stop(), fetch_data_poll(), fetch_file_poll(), fetch_javascript_poll(), fetch_resource_poll(), fetch_rsrc_poll(), and html_css_fetcher_poll().

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◆ fetch_send_callback()

void fetch_send_callback	(	const fetch_msg *	msg,
		struct fetch *	fetch
	)

send message to fetch

Definition at line 757 of file fetch.c.

References fetch::callback, fetch::last_msg, fetch::p, and fetch_msg::type.

Referenced by fetch_curl_data(), fetch_curl_done(), fetch_curl_header(), fetch_curl_process_headers(), fetch_curl_progress(), fetch_curl_report_certs_upstream(), fetch_data_send_callback(), fetch_file_send_callback(), fetch_free(), fetch_javascript_send_callback(), fetch_resource_send_callback(), fetch_rsrc_send_callback(), and html_css_fetcher_send_callback().

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◆ fetch_set_cookie()

void fetch_set_cookie	(	struct fetch *	fetch,
		const char *	data
	)

set cookie data on a fetch

Todo:: Long-term, this needs to be replaced with a comparison against the origin fetch URI. In the case where a nested object requests a fetch, the origin URI is the nested object's parent URI, whereas the referer for the fetch will be the nested object's URI.

Definition at line 803 of file fetch.c.

References fetch::referer, fetch::url, urldb_set_cookie(), and fetch::verifiable.

Referenced by fetch_curl_header().

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◆ fetch_set_http_code()

void fetch_set_http_code	(	struct fetch *	fetch,
		long	http_code
	)

set the http code of a fetch

Definition at line 794 of file fetch.c.

References fetch::http_code, and NSLOG.

Referenced by fetch_curl_data(), fetch_curl_process_headers(), fetch_data_poll(), fetch_file_process_dir(), fetch_file_process_error(), fetch_file_process_plain(), fetch_javascript_handler(), fetch_resource_data_handler(), fetch_resource_notfound_handler(), fetch_resource_redirect_handler(), fetch_rsrc_poll(), and html_css_fetcher_poll().

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◆ fetch_start()

nserror fetch_start	(	nsurl *	url,
		nsurl *	referer,
		fetch_callback	callback,
		void *	p,
		bool	only_2xx,
		const char *	post_urlenc,
		const struct fetch_multipart_data *	post_multipart,
		bool	verifiable,
		bool	downgrade_tls,
		const char *	headers[],
		struct fetch **	fetch_out
	)

Start fetching data for the given URL.

The function returns immediately. The fetch may be queued for later processing.

A pointer to an opaque struct fetch is returned, which can be passed to fetch_abort() to abort the fetch at any time. Returns NULL if memory is exhausted (or some other fatal error occurred).

The caller must supply a callback function which is called when anything interesting happens. The callback function is first called with msg FETCH_HEADER, with the header in data, then one or more times with FETCH_DATA with some data for the url, and finally with FETCH_FINISHED. Alternatively, FETCH_ERROR indicates an error occurred: data contains an error message. FETCH_REDIRECT may replace the FETCH_HEADER, FETCH_DATA, FETCH_FINISHED sequence if the server sends a replacement URL.

Parameters

url	URL to fetch
referer
callback
p
only_2xx
post_urlenc
post_multipart
verifiable
downgrade_tls
headers
fetch_out	ponter to recive new fetch object.

Returns: NSERROR_OK and fetch_out updated else appropriate error code

Todo:: The fetchers setup should return nserror and that be passed back rather than assuming a bad url

Definition at line 449 of file fetch.c.

References fetch::callback, fetch(), fetch_dispatch_jobs(), fetch_ref_fetcher(), fetch::fetcher_handle, fetcher_poll(), fetch::fetcherd, fetchers, get_fetcher_for_scheme(), guit, fetch::host, netsurf_table::misc, NSERROR_BAD_URL, NSERROR_NO_FETCH_HANDLER, NSERROR_NOMEM, NSERROR_OK, NSLOG, nsurl_access(), nsurl_get_component(), NSURL_HOST, nsurl_ref(), NSURL_SCHEME, nsurl_unref(), scheme_fetcher_s::ops, fetch::p, queue_ring, fetch::referer, RING_INSERT, gui_misc_table::schedule, fetcher_operation_table::setup, fetch::url, and fetch::verifiable.

Referenced by llcache_object_refetch().

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◆ fetch_unref_fetcher()

static void fetch_unref_fetcher ( int fetcherd )

inlinestatic

Definition at line 117 of file fetch.c.

References fetch::fetcherd, fetchers, fetcher_operation_table::finalise, scheme_fetcher_s::ops, and scheme_fetcher_s::refcount.

Referenced by fetch_free(), and fetcher_quit().

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◆ fetcher_add()

nserror fetcher_add	(	lwc_string *	scheme,
		const struct fetcher_operation_table *	ops
	)

Register a fetcher for a scheme.

Parameters

scheme	The scheme fetcher is for (caller relinquishes ownership)
ops	The operations for the fetcher.

Returns: NSERROR_OK or appropriate error code.

Definition at line 357 of file fetch.c.

References fetch_ref_fetcher(), fetch::fetcherd, fetchers, fetcher_operation_table::initialise, MAX_FETCHERS, NSERROR_INIT_FAILED, NSERROR_OK, scheme_fetcher_s::ops, and scheme_fetcher_s::scheme.

Referenced by fetch_curl_register(), fetch_data_register(), fetch_file_register(), fetch_javascript_register(), fetch_resource_register(), fetch_rsrc_register(), and html_css_fetcher_register().

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◆ fetcher_init()

nserror fetcher_init ( void )

Initialise all registered fetchers.

Returns: NSERROR_OK or error code

Definition at line 285 of file fetch.c.

References fetch_curl_register(), fetch_data_register(), fetch_file_register(), fetch_javascript_register(), fetch_resource_register(), and NSERROR_OK.

Referenced by netsurf_init().

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◆ fetcher_poll()

static void fetcher_poll ( void * unused )

static

Definition at line 262 of file fetch.c.

References fetch_dispatch_jobs(), fetcher_poll(), fetch::fetcherd, fetchers, guit, MAX_FETCHERS, netsurf_table::misc, NSLOG, scheme_fetcher_s::ops, fetcher_operation_table::poll, gui_misc_table::schedule, and SCHEDULE_TIME.

Referenced by fetch_fdset(), fetch_start(), and fetcher_poll().

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◆ fetcher_quit()

void fetcher_quit ( void )

Clean up for quit.

Must be called before exiting.

Definition at line 322 of file fetch.c.

References fetch_unref_fetcher(), fetch::fetcherd, fetchers, MAX_FETCHERS, NSLOG, and scheme_fetcher_s::refcount.

Referenced by netsurf_exit().

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◆ get_fetcher_for_scheme()

static int get_fetcher_for_scheme ( lwc_string * scheme )

static

Find a suitable fetcher for a scheme.

Definition at line 129 of file fetch.c.

References fetch::fetcherd, fetchers, and MAX_FETCHERS.

Referenced by fetch_can_fetch(), and fetch_start().

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Variable Documentation

◆ fetch_ring

struct fetch* fetch_ring = NULL

static

Ring of active fetches.

Definition at line 105 of file fetch.c.

Referenced by dump_rings(), fetch_choose_and_dispatch(), fetch_dispatch_job(), fetch_dispatch_jobs(), and fetch_remove_from_queues().

◆ fetchers

scheme_fetcher fetchers[MAX_FETCHERS]

static

Definition at line 86 of file fetch.c.

Referenced by fetch_abort(), fetch_can_fetch(), fetch_dispatch_job(), fetch_fdset(), fetch_free(), fetch_ref_fetcher(), fetch_start(), fetch_unref_fetcher(), fetcher_add(), fetcher_poll(), fetcher_quit(), and get_fetcher_for_scheme().

◆ queue_ring

struct fetch* queue_ring = NULL

static

Ring of queued fetches.

Definition at line 106 of file fetch.c.

Referenced by dump_rings(), fetch_choose_and_dispatch(), fetch_dispatch_job(), fetch_dispatch_jobs(), fetch_remove_from_queues(), and fetch_start().

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ FDSET_TIMEOUT

◆ MAX_FETCHERS

◆ SCHEDULE_TIME

Typedef Documentation

◆ scheme_fetcher

Function Documentation

◆ dump_rings()

◆ fetch_abort()

◆ fetch_can_fetch()

◆ fetch_change_callback()

◆ fetch_choose_and_dispatch()

◆ fetch_dispatch_job()

◆ fetch_dispatch_jobs()

◆ fetch_fdset()

◆ fetch_free()

◆ fetch_http_code()

◆ fetch_multipart_data_clone()

◆ fetch_multipart_data_destroy()

◆ fetch_multipart_data_find()

◆ fetch_multipart_data_new_kv()

◆ fetch_ref_fetcher()

◆ fetch_remove_from_queues()

◆ fetch_send_callback()

◆ fetch_set_cookie()

◆ fetch_set_http_code()

◆ fetch_start()

◆ fetch_unref_fetcher()

◆ fetcher_add()

◆ fetcher_init()

◆ fetcher_poll()

◆ fetcher_quit()

◆ get_fetcher_for_scheme()

Variable Documentation

◆ fetch_ring

◆ fetchers

◆ queue_ring