hsts: add support for Strict-Transport-Security

- enable in the build (configure)
- header parsing
- host name lookup
- unit tests for the above
- CI build
- CURL_VERSION_HSTS bit
- curl_version_info support
- curl -V output
- curl-config --features
- CURLOPT_HSTS_CTRL
- man page for CURLOPT_HSTS_CTRL
- curl --hsts (sets CURLOPT_HSTS_CTRL and works with --libcurl)
- man page for --hsts
- save cache to disk
- load cache from disk
- CURLOPT_HSTS
- man page for CURLOPT_HSTS
- added docs/HSTS.md
- fixed --version docs
- adjusted curl_easy_duphandle

Closes #5896

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/easyoptions.c b/lib/easyoptions.c
index 0ab6a3fc6..e5b9ffb70 100644
--- a/lib/easyoptions.c
+++ b/lib/easyoptions.c
@@ -115,6 +115,8 @@ struct curl_easyoption Curl_easyopts[] = {
   {"HEADERDATA", CURLOPT_HEADERDATA, CURLOT_CBPTR, 0},
   {"HEADERFUNCTION", CURLOPT_HEADERFUNCTION, CURLOT_FUNCTION, 0},
   {"HEADEROPT", CURLOPT_HEADEROPT, CURLOT_VALUES, 0},
+  {"HSTS", CURLOPT_HSTS, CURLOT_STRING, 0},
+  {"HSTS_CTRL", CURLOPT_HSTS_CTRL, CURLOT_LONG, 0},
   {"HTTP09_ALLOWED", CURLOPT_HTTP09_ALLOWED, CURLOT_LONG, 0},
   {"HTTP200ALIASES", CURLOPT_HTTP200ALIASES, CURLOT_SLIST, 0},
   {"HTTPAUTH", CURLOPT_HTTPAUTH, CURLOT_VALUES, 0},
@@ -342,6 +344,6 @@ struct curl_easyoption Curl_easyopts[] = {
  */
 int Curl_easyopts_check(void)
 {
-  return (CURLOPT_LASTENTRY != (298 + 1));
+  return (CURLOPT_LASTENTRY != (300 + 1));
 }
 #endif