netsurf/content/fetch.c

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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
*/
/** \file
* Fetching of data from a URL (implementation).
*
* This implementation uses libcurl's 'multi' interface.
*
* Active fetches are held in the linked list fetch_list. There may be at most
* one fetch in progress from each host. Any further fetches are queued until
* the previous one ends.
*
* Invariant: only the fetch at the head of each queue is in progress, ie.
* queue_prev == 0 <=> curl_handle != 0
* and queue_prev != 0 <=> curl_handle == 0.
*/
#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#ifdef riscos
#include <unixlib/local.h>
#endif
#include "curl/curl.h"
#include "netsurf/utils/config.h"
#include "netsurf/content/fetch.h"
#include "netsurf/desktop/options.h"
#ifdef WITH_AUTH
#include "netsurf/desktop/401login.h"
#endif
#ifdef WITH_POST
#include "netsurf/render/form.h"
#endif
#include "netsurf/utils/log.h"
#include "netsurf/utils/messages.h"
#include "netsurf/utils/url.h"
#include "netsurf/utils/utils.h"
bool fetch_active; /**< Fetches in progress, please call fetch_poll(). */
/** Information for a single fetch. */
struct fetch {
CURL * curl_handle; /**< cURL handle if being fetched, or 0. */
void (*callback)(fetch_msg msg, void *p, const char *data,
unsigned long size);
/**< Callback function. */
bool had_headers; /**< Headers have been processed. */
bool abort; /**< Abort requested. */
bool stopped; /**< Download stopped on purpose. */
bool only_2xx; /**< Only HTTP 2xx responses acceptable. */
bool cookies; /**< Send & accept cookies. */
char *url; /**< URL. */
char *referer; /**< URL for Referer header. */
void *p; /**< Private data for callback. */
struct curl_slist *headers; /**< List of request headers. */
char *host; /**< Host part of URL. */
char *location; /**< Response Location header, or 0. */
unsigned long content_length; /**< Response Content-Length, or 0. */
char *realm; /**< HTTP Auth Realm */
char *post_urlenc; /**< Url encoded POST string, or 0. */
struct curl_httppost *post_multipart; /**< Multipart post data, or 0. */
struct fetch *queue_prev; /**< Previous fetch for this host. */
struct fetch *queue_next; /**< Next fetch for this host. */
struct fetch *prev; /**< Previous active fetch in ::fetch_list. */
struct fetch *next; /**< Next active fetch in ::fetch_list. */
};
static const char * const user_agent = "NetSurf";
static CURLM *curl_multi; /**< Global cURL multi handle. */
/** Curl handle with default options set; not used for transfers. */
static CURL *fetch_blank_curl;
static struct fetch *fetch_list = 0; /**< List of active fetches. */
static char fetch_error_buffer[CURL_ERROR_SIZE]; /**< Error buffer for cURL. */
static char fetch_progress_buffer[256]; /**< Progress buffer for cURL */
static CURLcode fetch_set_options(struct fetch *f);
static void fetch_free(struct fetch *f);
static void fetch_stop(struct fetch *f);
static void fetch_done(CURL *curl_handle, CURLcode result);
static int fetch_curl_progress(void *clientp, double dltotal, double dlnow,
double ultotal, double ulnow);
static size_t fetch_curl_data(void *data, size_t size, size_t nmemb,
struct fetch *f);
static size_t fetch_curl_header(char *data, size_t size, size_t nmemb,
struct fetch *f);
static bool fetch_process_headers(struct fetch *f);
#ifdef WITH_POST
static struct curl_httppost *fetch_post_convert(struct form_successful_control *control);
#endif
#ifdef riscos
static char * ca_bundle; /**< SSL certificate bundle filename. */
extern const char * const NETSURF_DIR;
#endif
/**
* Initialise the fetcher.
*
* Must be called once before any other function.
*/
void fetch_init(void)
{
CURLcode code;
code = curl_global_init(CURL_GLOBAL_ALL);
if (code != CURLE_OK)
die("Failed to initialise the fetch module "
"(curl_global_init failed).");
curl_multi = curl_multi_init();
if (!curl_multi)
die("Failed to initialise the fetch module "
"(curl_multi_init failed).");
#ifdef riscos
ca_bundle = malloc(strlen(NETSURF_DIR) + 40);
if (!ca_bundle)
die("NoMemory");
sprintf(ca_bundle, "%s.Resources.ca-bundle", NETSURF_DIR);
#endif
/* Create a curl easy handle with the options that are common to all
fetches. */
fetch_blank_curl = curl_easy_init();
if (!fetch_blank_curl)
die("Failed to initialise the fetch module "
"(curl_easy_init failed).");
#define SETOPT(option, value) \
code = curl_easy_setopt(fetch_blank_curl, option, value); \
if (code != CURLE_OK) \
goto curl_easy_setopt_failed;
SETOPT(CURLOPT_VERBOSE, 1);
SETOPT(CURLOPT_ERRORBUFFER, fetch_error_buffer);
SETOPT(CURLOPT_WRITEFUNCTION, fetch_curl_data);
SETOPT(CURLOPT_HEADERFUNCTION, fetch_curl_header);
SETOPT(CURLOPT_PROGRESSFUNCTION, fetch_curl_progress);
SETOPT(CURLOPT_NOPROGRESS, 0);
SETOPT(CURLOPT_USERAGENT, user_agent);
SETOPT(CURLOPT_ENCODING, "gzip");
SETOPT(CURLOPT_LOW_SPEED_LIMIT, 1L);
SETOPT(CURLOPT_LOW_SPEED_TIME, 60L);
SETOPT(CURLOPT_NOSIGNAL, 1L);
SETOPT(CURLOPT_CONNECTTIMEOUT, 60L);
#ifdef riscos
SETOPT(CURLOPT_CAINFO, ca_bundle);
#endif
if (!option_ssl_verify_certificates) {
/* disable verification of SSL certificates.
* security? we've heard of it...
*/
SETOPT(CURLOPT_SSL_VERIFYPEER, 0L);
SETOPT(CURLOPT_SSL_VERIFYHOST, 0L);
}
return;
curl_easy_setopt_failed:
die("Failed to initialise the fetch module "
"(curl_easy_setopt failed).");
}
/**
* Clean up for quit.
*
* Must be called before exiting.
*/
void fetch_quit(void)
{
CURLMcode codem;
curl_easy_cleanup(fetch_blank_curl);
codem = curl_multi_cleanup(curl_multi);
if (codem != CURLM_OK)
LOG(("curl_multi_cleanup failed: ignoring"));
curl_global_cleanup();
}
/**
* 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 0 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_TYPE, with the Content-Type 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_TYPE,
* FETCH_DATA, FETCH_FINISHED sequence if the server sends a replacement URL.
*
* Some private data can be passed as the last parameter to fetch_start, and
* callbacks will contain this.
*/
struct fetch * fetch_start(char *url, char *referer,
void (*callback)(fetch_msg msg, void *p, const char *data,
unsigned long size),
void *p, bool only_2xx, char *post_urlenc,
struct form_successful_control *post_multipart, bool cookies)
{
char *host;
struct fetch *fetch;
struct fetch *host_fetch;
CURLcode code;
CURLMcode codem;
struct curl_slist *slist;
fetch = malloc(sizeof (*fetch));
if (!fetch)
return 0;
host = url_host(url);
LOG(("fetch %p, url '%s'", fetch, url));
/* construct a new fetch structure */
fetch->curl_handle = 0;
fetch->callback = callback;
fetch->had_headers = false;
fetch->abort = false;
fetch->stopped = false;
fetch->only_2xx = only_2xx;
fetch->cookies = cookies;
fetch->url = strdup(url);
fetch->referer = 0;
if (referer)
fetch->referer = strdup(referer);
fetch->p = p;
fetch->headers = 0;
fetch->host = host;
fetch->location = 0;
fetch->content_length = 0;
fetch->realm = 0;
fetch->post_urlenc = 0;
fetch->post_multipart = 0;
if (post_urlenc)
fetch->post_urlenc = strdup(post_urlenc);
else if (post_multipart)
fetch->post_multipart = fetch_post_convert(post_multipart);
fetch->queue_prev = 0;
fetch->queue_next = 0;
fetch->prev = 0;
fetch->next = 0;
if (!fetch->url || (referer && !fetch->referer) ||
(post_urlenc && !fetch->post_urlenc) ||
(post_multipart && !fetch->post_multipart))
goto failed;
#define APPEND(list, value) \
slist = curl_slist_append(list, value); \
if (!slist) \
goto failed; \
list = slist;
/* remove curl default headers */
APPEND(fetch->headers, "Accept:");
APPEND(fetch->headers, "Pragma:");
if (option_accept_language) {
char s[80];
snprintf(s, sizeof s, "Accept-Language: %s, *;q=0.1",
option_accept_language);
s[sizeof s - 1] = 0;
APPEND(fetch->headers, s);
}
/* look for a fetch from the same host */
if (host) {
for (host_fetch = fetch_list;
host_fetch && (host_fetch->host == 0 ||
strcasecmp(host_fetch->host, host) != 0);
host_fetch = host_fetch->next)
;
if (host_fetch) {
/* fetch from this host in progress:
queue the new fetch */
LOG(("queueing"));
fetch->curl_handle = 0;
/* queue at end */
for (; host_fetch->queue_next;
host_fetch = host_fetch->queue_next)
;
fetch->queue_prev = host_fetch;
host_fetch->queue_next = fetch;
return fetch;
}
}
/* create the curl easy handle */
fetch->curl_handle = curl_easy_duphandle(fetch_blank_curl);
if (!fetch->curl_handle)
goto failed;
code = fetch_set_options(fetch);
if (code != CURLE_OK)
goto failed;
/* add to the global curl multi handle */
codem = curl_multi_add_handle(curl_multi, fetch->curl_handle);
assert(codem == CURLM_OK || codem == CURLM_CALL_MULTI_PERFORM);
fetch->next = fetch_list;
if (fetch_list != 0)
fetch_list->prev = fetch;
fetch_list = fetch;
fetch_active = true;
return fetch;
failed:
free(host);
free(fetch->url);
free(fetch->referer);
free(fetch->post_urlenc);
if (fetch->post_multipart)
curl_formfree(fetch->post_multipart);
curl_slist_free_all(fetch->headers);
free(fetch);
return 0;
}
/**
* Set options specific for a fetch.
*/
CURLcode fetch_set_options(struct fetch *f)
{
CURLcode code;
struct login *li;
char proxy_userpwd[100];
#undef SETOPT
#define SETOPT(option, value) \
code = curl_easy_setopt(f->curl_handle, option, value); \
if (code != CURLE_OK) \
return code;
SETOPT(CURLOPT_URL, f->url);
SETOPT(CURLOPT_PRIVATE, f);
SETOPT(CURLOPT_WRITEDATA, f);
SETOPT(CURLOPT_WRITEHEADER, f);
SETOPT(CURLOPT_PROGRESSDATA, f);
SETOPT(CURLOPT_REFERER, f->referer);
SETOPT(CURLOPT_HTTPHEADER, f->headers);
if (f->post_urlenc) {
SETOPT(CURLOPT_POSTFIELDS, f->post_urlenc);
} else if (f->post_multipart) {
SETOPT(CURLOPT_HTTPPOST, f->post_multipart);
} else {
SETOPT(CURLOPT_HTTPGET, 1L);
}
if (f->cookies) {
SETOPT(CURLOPT_COOKIEFILE, messages_get("cookiefile"));
SETOPT(CURLOPT_COOKIEJAR, messages_get("cookiejar"));
} else {
SETOPT(CURLOPT_COOKIEFILE, 0);
SETOPT(CURLOPT_COOKIEJAR, 0);
}
if ((li = login_list_get(f->url))) {
SETOPT(CURLOPT_HTTPAUTH, CURLAUTH_ANY);
SETOPT(CURLOPT_USERPWD, li->logindetails);
} else {
SETOPT(CURLOPT_USERPWD, 0);
}
if (option_http_proxy && option_http_proxy_host) {
SETOPT(CURLOPT_PROXY, option_http_proxy_host);
SETOPT(CURLOPT_PROXYPORT, (long) option_http_proxy_port);
if (option_http_proxy_auth != OPTION_HTTP_PROXY_AUTH_NONE) {
SETOPT(CURLOPT_PROXYAUTH,
option_http_proxy_auth ==
OPTION_HTTP_PROXY_AUTH_BASIC ?
(long) CURLAUTH_BASIC :
(long) CURLAUTH_NTLM);
snprintf(proxy_userpwd, sizeof proxy_userpwd, "%s:%s",
option_http_proxy_auth_user,
option_http_proxy_auth_pass);
SETOPT(CURLOPT_PROXYUSERPWD, proxy_userpwd);
}
}
return CURLE_OK;
}
/**
* Abort a fetch.
*/
void fetch_abort(struct fetch *f)
{
assert(f);
LOG(("fetch %p, url '%s'", f, f->url));
f->abort = true;
}
/**
* Clean up a fetch and start any queued fetch for the same host.
*/
void fetch_stop(struct fetch *f)
{
CURLcode code;
CURLMcode codem;
struct fetch *fetch;
struct fetch *next_fetch;
assert(f);
LOG(("fetch %p, url '%s'", f, f->url));
/* remove from list of fetches */
if (f->prev == 0)
fetch_list = f->next;
else
f->prev->next = f->next;
if (f->next != 0)
f->next->prev = f->prev;
/* remove from curl multi handle */
if (f->curl_handle) {
codem = curl_multi_remove_handle(curl_multi, f->curl_handle);
assert(codem == CURLM_OK);
}
if (f->curl_handle && f->queue_next) {
/* start a queued fetch for this host, reusing the handle */
fetch = f->queue_next;
LOG(("starting queued %p '%s'", fetch, fetch->url));
fetch->curl_handle = f->curl_handle;
f->curl_handle = 0;
code = fetch_set_options(fetch);
if (code == CURLE_OK)
/* add to the global curl multi handle */
codem = curl_multi_add_handle(curl_multi,
fetch->curl_handle);
if (code == CURLE_OK && (codem == CURLM_OK ||
codem == CURLM_CALL_MULTI_PERFORM)) {
/* add to list of fetches */
fetch->prev = 0;
fetch->next = fetch_list;
if (fetch_list != 0)
fetch_list->prev = fetch;
fetch_list = fetch;
fetch->queue_prev = 0;
} else {
/* destroy all queued fetches for this host */
do {
fetch->callback(FETCH_ERROR, fetch->p,
messages_get("FetchError"), 0);
next_fetch = fetch->queue_next;
fetch_free(fetch);
fetch = next_fetch;
} while (fetch);
}
} else {
if (f->queue_prev)
f->queue_prev->queue_next = f->queue_next;
if (f->queue_next)
f->queue_next->queue_prev = f->queue_prev;
}
fetch_free(f);
}
/**
* Free a fetch structure and associated resources.
*/
void fetch_free(struct fetch *f)
{
if (f->curl_handle)
curl_easy_cleanup(f->curl_handle);
free(f->url);
free(f->host);
free(f->referer);
free(f->location);
free(f->realm);
if (f->headers)
curl_slist_free_all(f->headers);
free(f->post_urlenc);
if (f->post_multipart)
curl_formfree(f->post_multipart);
free(f);
}
/**
* Do some work on current fetches.
*
* Must be called regularly to make progress on fetches.
*/
void fetch_poll(void)
{
int running, queue;
CURLMcode codem;
CURLMsg *curl_msg;
/* do any possible work on the current fetches */
do {
codem = curl_multi_perform(curl_multi, &running);
assert(codem == CURLM_OK || codem == CURLM_CALL_MULTI_PERFORM);
} while (codem == CURLM_CALL_MULTI_PERFORM);
/* process curl results */
curl_msg = curl_multi_info_read(curl_multi, &queue);
while (curl_msg) {
switch (curl_msg->msg) {
case CURLMSG_DONE:
fetch_done(curl_msg->easy_handle,
curl_msg->data.result);
break;
default:
break;
}
curl_msg = curl_multi_info_read(curl_multi, &queue);
}
if (!fetch_list)
fetch_active = false;
}
/**
* Handle a completed fetch (CURLMSG_DONE from curl_multi_info_read()).
*
* \param curl_handle curl easy handle of fetch
*/
void fetch_done(CURL *curl_handle, CURLcode result)
{
bool finished = false;
bool error = false;
bool abort;
struct fetch *f;
void *p;
void (*callback)(fetch_msg msg, void *p, const char *data,
unsigned long size);
CURLcode code;
/* find the structure associated with this fetch */
code = curl_easy_getinfo(curl_handle, CURLINFO_PRIVATE, &f);
assert(code == CURLE_OK);
abort = f->abort;
callback = f->callback;
p = f->p;
if (result == CURLE_OK) {
/* fetch completed normally */
if (!f->had_headers && fetch_process_headers(f))
; /* redirect with no body or similar */
else
finished = true;
} else if (result == CURLE_WRITE_ERROR && f->stopped)
/* CURLE_WRITE_ERROR occurs when fetch_curl_data
* returns 0, which we use to abort intentionally */
;
else
error = true;
/* clean up fetch and start any queued fetch for this host */
fetch_stop(f);
/* postponed until after stop so that queue fetches are started */
if (abort)
; /* fetch was aborted: no callback */
else if (finished)
callback(FETCH_FINISHED, p, 0, 0);
else if (error)
callback(FETCH_ERROR, p, fetch_error_buffer, 0);
}
/**
* Callback function for fetch progress.
*/
int fetch_curl_progress(void *clientp, double dltotal, double dlnow,
double ultotal, double ulnow)
{
struct fetch *f = (struct fetch *) clientp;
double percent;
if (f->abort)
return 0;
if (dltotal > 0) {
percent = dlnow * 100.0f / dltotal;
snprintf(fetch_progress_buffer, 255,
messages_get("Progress"),
human_friendly_bytesize(dlnow),
human_friendly_bytesize(dltotal));
f->callback(FETCH_PROGRESS, f->p, fetch_progress_buffer,
(unsigned long) percent);
} else {
snprintf(fetch_progress_buffer, 255,
messages_get("ProgressU"),
human_friendly_bytesize(dlnow));
f->callback(FETCH_PROGRESS, f->p, fetch_progress_buffer, 0);
}
return 0;
}
/**
* Callback function for cURL.
*/
size_t fetch_curl_data(void *data, size_t size, size_t nmemb,
struct fetch *f)
{
LOG(("fetch %p, size %u", f, size * nmemb));
if (f->abort || (!f->had_headers && fetch_process_headers(f))) {
f->stopped = true;
return 0;
}
/* send data to the caller */
LOG(("FETCH_DATA"));
f->callback(FETCH_DATA, f->p, data, size * nmemb);
if (f->abort) {
f->stopped = true;
return 0;
}
return size * nmemb;
}
/**
* Callback function for headers.
*/
size_t fetch_curl_header(char *data, size_t size, size_t nmemb,
struct fetch *f)
{
int i;
size *= nmemb;
if (12 < size && strncasecmp(data, "Location:", 9) == 0) {
/* extract Location header */
free(f->location);
f->location = malloc(size);
if (!f->location) {
LOG(("malloc failed"));
return size;
}
for (i = 9; i < (int)size && (data[i] == ' ' || data[i] == '\t'); i++)
/* */;
strncpy(f->location, data + i, size - i);
f->location[size - i] = '\0';
for (i = size - i - 1; i >= 0 &&
(f->location[i] == ' ' ||
f->location[i] == '\t' ||
f->location[i] == '\r' ||
f->location[i] == '\n'); i--)
f->location[i] = '\0';
} else if (15 < size && strncasecmp(data, "Content-Length:", 15) == 0) {
/* extract Content-Length header */
for (i = 15; i < (int)size && (data[i] == ' ' || data[i] == '\t'); i++)
/* */;
if ('0' <= data[i] && data[i] <= '9')
f->content_length = atol(data + i);
#ifdef WITH_AUTH
} else if (16 < size && strncasecmp(data, "WWW-Authenticate", 16) == 0) {
/* extract the first Realm from WWW-Authenticate header */
free(f->realm);
f->realm = malloc(size);
if (!f->realm) {
LOG(("malloc failed"));
return size;
}
for (i = 16; i < (int)size && data[i] != '='; i++)
/* */;
while (i < (int)size && data[++i] == '"')
/* */;
strncpy(f->realm, data + i, size - i);
f->realm[size - i] = '\0';
for (i = size - i - 1; i >= 0 &&
(f->realm[i] == ' ' ||
f->realm[i] == '"' ||
f->realm[i] == '\t' ||
f->realm[i] == '\r' ||
f->realm[i] == '\n'); --i)
f->realm[i] = '\0';
#endif
}
return size;
}
/**
* Find the status code and content type and inform the caller.
*
* Return true if the fetch is being aborted.
*/
bool fetch_process_headers(struct fetch *f)
{
long http_code;
const char *type;
CURLcode code;
f->had_headers = true;
code = curl_easy_getinfo(f->curl_handle, CURLINFO_HTTP_CODE, &http_code);
assert(code == CURLE_OK);
LOG(("HTTP status code %li", http_code));
/* handle HTTP redirects (3xx response codes) */
if (300 <= http_code && http_code < 400 && f->location != 0) {
LOG(("FETCH_REDIRECT, '%s'", f->location));
f->callback(FETCH_REDIRECT, f->p, f->location, 0);
return true;
}
/* handle HTTP 401 (Authentication errors) */
#ifdef WITH_AUTH
if (http_code == 401) {
f->callback(FETCH_AUTH, f->p, f->realm,0);
return true;
}
#endif
/* handle HTTP errors (non 2xx response codes) */
if (f->only_2xx && strncmp(f->url, "http", 4) == 0 &&
(http_code < 200 || 299 < http_code)) {
f->callback(FETCH_ERROR, f->p, messages_get("Not2xx"), 0);
return true;
}
/* find MIME type from headers or filetype for local files */
code = curl_easy_getinfo(f->curl_handle, CURLINFO_CONTENT_TYPE, &type);
assert(code == CURLE_OK);
if (type == 0) {
type = "text/html";
if (strncmp(f->url, "file:///", 8) == 0) {
char *url_path;
url_path = curl_unescape(f->url + 8, (int) strlen(f->url) - 8);
type = fetch_filetype(url_path);
curl_free(url_path);
} else if (strncmp(f->url, "file:/", 6) == 0) {
char *url_path;
url_path = curl_unescape(f->url + 6, (int) strlen(f->url) - 6);
type = fetch_filetype(url_path);
curl_free(url_path);
}
}
LOG(("FETCH_TYPE, '%s'", type));
f->callback(FETCH_TYPE, f->p, type, f->content_length);
if (f->abort)
return true;
return false;
}
/**
* Convert a list of struct ::form_successful_control to a list of
* struct curl_httppost for libcurl.
*/
#ifdef WITH_POST
struct curl_httppost *fetch_post_convert(struct form_successful_control *control)
{
struct curl_httppost *post = 0, *last = 0;
char *mimetype = 0;
char *leafname = 0, *temp = 0;
for (; control; control = control->next) {
if (control->file) {
mimetype = fetch_mimetype(control->value);
#ifdef riscos
temp = strrchr(control->value, '.');
if (!temp)
temp = control->value; /* already leafname */
else
temp += 1;
leafname = calloc(strlen(temp)+5, sizeof(char));
if (!leafname) {
LOG(("calloc failed"));
free(mimetype);
continue;
}
__unixify_std(temp, leafname, strlen(temp), 0xfff);
#else
leafname = strrchr(control->value, '/') ;
if (!leafname)
leafname = control->value;
else
leafname += 1;
#endif
curl_formadd(&post, &last,
CURLFORM_COPYNAME, control->name,
CURLFORM_FILE, control->value,
CURLFORM_FILENAME, leafname,
CURLFORM_CONTENTTYPE,
(mimetype != 0 ? mimetype : "text/plain"),
CURLFORM_END);
#ifdef riscos
free(leafname);
#endif
free(mimetype);
}
else {
curl_formadd(&post, &last,
CURLFORM_COPYNAME, control->name,
CURLFORM_COPYCONTENTS, control->value,
CURLFORM_END);
}
}
return post;
}
#endif
/**
* Check if a URL's scheme can be fetched.
*
* \param url URL to check
* \return true if the scheme is supported
*/
bool fetch_can_fetch(const char *url)
{
unsigned int i;
const char *semi;
unsigned int len;
curl_version_info_data *data;
semi = strchr(url, ':');
if (!semi)
return false;
len = semi - url;
data = curl_version_info(CURLVERSION_NOW);
for (i = 0; data->protocols[i]; i++)
if (strlen(data->protocols[i]) == len &&
strncasecmp(url, data->protocols[i], len) == 0)
return true;
return false;
}
/**
* Change the callback function for a fetch.
*/
void fetch_change_callback(struct fetch *fetch,
void (*callback)(fetch_msg msg, void *p, const char *data,
unsigned long size),
void *p)
{
assert(fetch);
fetch->callback = callback;
fetch->p = p;
}
/**
* testing framework
*/
#ifdef TEST
#include <unistd.h>
struct test {char *url; struct fetch *f;};
void callback(fetch_msg msg, struct test *t, char *data, unsigned long size)
{
printf("%s: ", t->url);
switch (msg) {
case FETCH_TYPE:
printf("FETCH_TYPE '%s'", data);
break;
case FETCH_DATA:
printf("FETCH_DATA %lu", size);
break;
case FETCH_FINISHED:
printf("FETCH_FINISHED");
break;
case FETCH_ERROR:
printf("FETCH_ERROR '%s'", data);
break;
default:
assert(0);
}
printf("\n");
}
struct test test[] = {
{"http://127.0.0.1/", 0},
{"http://netsurf.strcprstskrzkrk.co.uk/", 0},
{"http://www.oxfordstudent.com/", 0},
{"http://www.google.co.uk/", 0},
{"http://news.bbc.co.uk/", 0},
{"http://doesnt.exist/", 0},
{"blah://blah", 0},
};
int main(void)
{
int i;
fetch_init();
for (i = 0; i != sizeof(test) / sizeof(test[0]); i++)
test[i].f = fetch_start(test[i].url, 0, callback, &test[i]);
while (1) {
fetch_poll();
sleep(1);
}
return 0;
}
#endif