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authorJohannes Schindelin <johannes.schindelin@gmx.de>2017-07-07 11:49:08 +0200
committerDaniel Stenberg <daniel@haxx.se>2017-08-28 14:56:59 +0200
commit1328f69d53f2f2e937696ea954c480412b018451 (patch)
tree289545b26293a9a261e768cc6d1192d7e7b042c1 /lib/vtls/nss.c
parentb59288f88146b64ac5fda296675c523df11658b8 (diff)
vtls: introduce curl_global_sslset()
Let's add a compile time safe API to select an SSL backend. This function needs to be called *before* curl_global_init(), and can be called only once. Side note: we do not explicitly test that it is called before curl_global_init(), but we do verify that it is not called multiple times (even implicitly). If SSL is used before the function was called, it will use whatever the CURL_SSL_BACKEND environment variable says (or default to the first available SSL backend), and if a subsequent call to curl_global_sslset() disagrees with the previous choice, it will fail with CURLSSLSET_TOO_LATE. The function also accepts an "avail" parameter to point to a (read-only) NULL-terminated list of available backends. This comes in real handy if an application wants to let the user choose between whatever SSL backends the currently available libcurl has to offer: simply call curl_global_sslset(-1, NULL, &avail); which will return CURLSSLSET_UNKNOWN_BACKEND and populate the avail variable to point to the relevant information to present to the user. Just like with the HTTP/2 push functions, we have to add the function declaration of curl_global_sslset() function to the header file *multi.h* because VMS and OS/400 require a stable order of functions declared in include/curl/*.h (where the header files are sorted alphabetically). This looks a bit funny, but it cannot be helped. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Diffstat (limited to 'lib/vtls/nss.c')
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