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