/* * 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 * Copyright 2003 Phil Mellor */ /** \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 #include #include #include #include #ifdef riscos #include #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 #ifdef riscos #include "netsurf/riscos/gui.h" #endif #define NDEBUG #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"; CURLM *fetch_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 char fetch_proxy_userpwd[100]; /**< Proxy authentication details. */ 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. */ #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)."); fetch_curl_multi = curl_multi_init(); if (!fetch_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(fetch_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; url_func_result res; char *ref1 = 0, *ref2 = 0; fetch = malloc(sizeof (*fetch)); if (!fetch) return 0; res = url_host(url, &host); /* we only fail memory exhaustion */ if (res == URL_FUNC_NOMEM) goto failed; if (!host) host = strdup(""); if (!host) goto failed; res = url_scheme(url, &ref1); /* we only fail memory exhaustion */ if (res == URL_FUNC_NOMEM) goto failed; if (referer) { res = url_scheme(referer, &ref2); /* we only fail memory exhaustion */ if (res == URL_FUNC_NOMEM) goto failed; } 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; /* only send the referer if the schemes match */ if (referer) { if (ref1 && ref2 && strcasecmp(ref1, ref2) == 0) 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 && (ref1 && ref2 && strcasecmp(ref1, ref2) == 0) && !fetch->referer) || (post_urlenc && !fetch->post_urlenc) || (post_multipart && !fetch->post_multipart)) goto failed; /* these aren't needed past here */ if (ref1) { free(ref1); ref1 = 0; } if (ref2) { free(ref2); ref2 = 0; } #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); } /* Ensure that the Host header is set */ { char s[80]; snprintf(s, sizeof s, "Host: %s", host); s[sizeof s - 1] = 0; APPEND(fetch->headers, s); } /* look for a fetch from the same host */ for (host_fetch = fetch_list; host_fetch && 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(fetch_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); if (ref1) free(ref1); if (ref2) free(ref2); 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; #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)) != NULL) { 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(fetch_proxy_userpwd, sizeof fetch_proxy_userpwd, "%s:%s", option_http_proxy_auth_user, option_http_proxy_auth_pass); SETOPT(CURLOPT_PROXYUSERPWD, fetch_proxy_userpwd); } } return CURLE_OK; } /** * Abort a fetch. */ void fetch_abort(struct fetch *f) { assert(f); LOG(("fetch %p, url '%s'", f, f->url)); 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); } else { 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(fetch_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(fetch_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(fetch_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(fetch_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(fetch_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 (!abort && result == CURLE_OK) { /* fetch completed normally */ if (f->stopped || (!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 (i < (int)size && '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 + 7, (int) strlen(f->url) - 7); 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 + 5, (int) strlen(f->url) - 5); 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; size_t len; curl_version_info_data *data; if ((semi = strchr(url, ':')) == NULL) 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 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