kinetic (3) CURLOPT_HSTSREADFUNCTION.3.gz
NAME
CURLOPT_HSTSREADFUNCTION - read callback for HSTS hosts
SYNOPSIS
#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] */ }; CURLSTScode hstsread(CURL *easy, struct curl_hstsentry *sts, void *userp); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTSREADFUNCTION, hstsread);
DESCRIPTION
Pass a pointer to your callback function, as the prototype shows above. This callback function gets called by libcurl repeatedly when it populates the in-memory HSTS cache. Set the userp argument with the CURLOPT_HSTSREADDATA(3) option or it will be NULL. When this callback is invoked, the sts pointer points to a populated struct: Copy the host name to 'name' (no longer than 'namelen' bytes). Make it null-terminated. Set 'includeSubDomains' to TRUE or FALSE. Set 'expire' to a date stamp or a zero length string for *forever* (wrong date stamp format might cause the name to not get accepted) The callback should return CURLSTS_OK if it returns a name and is prepared to be called again (for another host) or CURLSTS_DONE if it has no entry to return. It can also return CURLSTS_FAIL to signal error. Returning CURLSTS_FAIL will stop the transfer from being performed and make CURLE_ABORTED_BY_CALLBACK get returned. This option does not enable HSTS, you need to use CURLOPT_HSTS_CTRL(3) to do that.
DEFAULT
NULL - no callback.
PROTOCOLS
This feature is only used for HTTP(S) transfer.
EXAMPLE
{ /* set HSTS read callback */ curl_easy_setopt(curl, CURLOPT_HSTSREADFUNCTION, hstsread); /* pass in suitable argument to the callback */ curl_easy_setopt(curl, CURLOPT_HSTSREADDATA, &hstspreload[0]); result = curl_easy_perform(curl); }
AVAILABILITY
Added in 7.74.0
RETURN VALUE
This will return CURLE_OK.
SEE ALSO
CURLOPT_HSTSREADDATA(3), CURLOPT_HSTSWRITEFUNCTION(3), CURLOPT_HSTS(3), CURLOPT_HSTS_CTRL(3),