Provided by: libcurl4-doc_8.9.1-2ubuntu2.1_all
NAME
CURLOPT_HSTSWRITEFUNCTION - write 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] */ }; 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);
DESCRIPTION
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 hostname 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.
DEFAULT
NULL - no callback.
PROTOCOLS
This functionality affects http only
EXAMPLE
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); } }
AVAILABILITY
Added in curl 7.74.0
RETURN VALUE
This returns CURLE_OK.
SEE ALSO
CURLOPT_HSTS(3), CURLOPT_HSTSWRITEDATA(3), CURLOPT_HSTSWRITEFUNCTION(3), CURLOPT_HSTS_CTRL(3)