CURLOPT_HSTSWRITEFUNCTION − write callback for HSTS hosts
#include <curl/curl.h>
struct
curl_hstsentry {
char *name;
size_t namelen;
unsigned int includeSubDomains:1;
char expire[18]; /* YYYYMMDD HH:MM:SS [null-terminated] */
};
struct
curl_index {
size_t index; /* the provided entry’s
"index" or count */
size_t total; /* total number of entries to save */
};
CURLSTScode
hstswrite(CURL *easy, struct curl_hstsentry *sts,
struct curl_index *count, void *clientp);
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTSWRITEFUNCTION, hstswrite);
Pass a pointer to your callback function, as the prototype shows above.
This callback function gets called by libcurl repeatedly to allow the application to store the in-memory HSTS cache when libcurl is about to discard it.
Set the clientp argument with the CURLOPT_HSTSWRITEDATA(3) option or it is NULL. When the callback is invoked, the sts pointer points to a populated struct: Read the host name to ’name’ (it is namelen bytes long and null terminated. The includeSubDomains field is non-zero if the entry matches subdomains. The expire string is a date stamp null-terminated string using the syntax YYYYMMDD HH:MM:SS.
The callback should return CURLSTS_OK if it succeeded and is prepared to be called again (for another host) or CURLSTS_DONE if there is nothing more to do. It can also return CURLSTS_FAIL to signal error.
This option does not enable HSTS, you need to use CURLOPT_HSTS_CTRL(3) to do that.
NULL - no callback.
This feature is only used for HTTP(S) transfer.
struct priv {
void *custom;
};
static
CURLSTScode hswr_cb(CURL *easy, struct curl_hstsentry *sts,
struct curl_index *count, void *clientp)
{
/* save the passed in HSTS data somewhere */
return CURLSTS_OK;
}
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
struct priv my_stuff;
CURLcode res;
/* set HSTS read
callback */
curl_easy_setopt(curl, CURLOPT_HSTSWRITEFUNCTION,
hswr_cb);
/* pass in
suitable argument to the callback */
curl_easy_setopt(curl, CURLOPT_HSTSWRITEDATA,
&my_stuff);
res =
curl_easy_perform(curl);
}
}
Added in 7.74.0
This returns CURLE_OK.
CURLOPT_HSTS(3), CURLOPT_HSTS_CTRL(3), CURLOPT_HSTSWRITEDATA(3), CURLOPT_HSTSWRITEFUNCTION(3)