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content/fetchers/curl.c: Defer fetch start if inside cURL

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In order to cope better with modern cURL which prevents making
cURL calls when inside a callback from within cURL, defer fetch
start when we are processing in `fetch_curl_data()`.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
This commit is contained in:
Daniel Silverstone 2019-06-05 19:51:47 +01:00
parent 41608a73c0
commit 3d80e825e1
1 changed files with 16 additions and 0 deletions
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16
content/fetchers/curl.c
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@ -142,6 +142,9 @@ static char fetch_error_buffer[CURL_ERROR_SIZE];
/** Proxy authentication details. */
static char fetch_proxy_userpwd[100];
/** Interlock to prevent initiation during callbacks */
static bool inside_curl = false;
/* OpenSSL 1.0.x to 1.1.0 certificate reference counting changed
* LibreSSL declares its OpenSSL version as 2.1 but only supports the old way
@ -710,6 +713,9 @@ fetch_curl_initiate_fetch(struct curl_fetch_info *fetch, CURL *handle)
code = fetch_curl_set_options(fetch);
if (code != CURLE_OK) {
fetch->curl_handle = 0;
/* The handle maybe went bad, eat it */
NSLOG(netsurf, WARNING, "cURL handle maybe went bad, retry later");
curl_easy_cleanup(handle);
return false;
}
@ -747,6 +753,10 @@ static CURL *fetch_curl_get_handle(lwc_string *host)
static bool fetch_curl_start(void *vfetch)
{
struct curl_fetch_info *fetch = (struct curl_fetch_info*)vfetch;
if (inside_curl) {
NSLOG(netsurf, DEBUG, "Deferring fetch because we're inside cURL");
return false;
}
return fetch_curl_initiate_fetch(fetch,
fetch_curl_get_handle(fetch->host));
}
@ -1317,6 +1327,9 @@ static size_t fetch_curl_data(char *data, size_t size, size_t nmemb, void *_f)
CURLcode code;
fetch_msg msg;
assert(inside_curl == false);
inside_curl = true;
/* ensure we only have to get this information once */
if (!f->http_code) {
code = curl_easy_getinfo(f->curl_handle, CURLINFO_HTTP_CODE,
@ -1330,11 +1343,13 @@ static size_t fetch_curl_data(char *data, size_t size, size_t nmemb, void *_f)
*/
if (f->http_code == 401) {
f->http_code = 0;
inside_curl = false;
return size * nmemb;
}
if (f->abort || (!f->had_headers && fetch_curl_process_headers(f))) {
f->stopped = true;
inside_curl = false;
return 0;
}
@ -1344,6 +1359,7 @@ static size_t fetch_curl_data(char *data, size_t size, size_t nmemb, void *_f)
msg.data.header_or_data.len = size * nmemb;
fetch_send_callback(&msg, f->fetch_handle);
inside_curl = false;
if (f->abort) {
f->stopped = true;
return 0;