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    8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
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   20:  *
   21:  ***************************************************************************/
   22: /* <DESC>
   23:  * Shows HTTPS usage with client certs and optional ssl engine use.
   24:  * </DESC>
   25:  */
   26: #include <assert.h>
   27: #include <ctype.h>
   28: #include <stdio.h>
   29: #include <stdlib.h>
   30: #include <string.h>
   31: 
   32: #include <curl/curl.h>
   33: 
   34: /*
   35:  * An SSL-enabled libcurl is required for this sample to work (at least one
   36:  * SSL backend has to be configured).
   37:  *
   38:  *  **** This example only works with libcurl 7.56.0 and later! ****
   39: */
   40: 
   41: int main(int argc, char **argv)
   42: {
   43:   const char *name = argc > 1 ? argv[1] : "openssl";
   44:   CURLsslset result;
   45: 
   46:   if(!strcmp("list", name)) {
   47:     const curl_ssl_backend **list;
   48:     int i;
   49: 
   50:     result = curl_global_sslset(-1, NULL, &list);
   51:     assert(result == CURLSSLSET_UNKNOWN_BACKEND);
   52: 
   53:     for(i = 0; list[i]; i++)
   54:       printf("SSL backend #%d: '%s' (ID: %d)\n",
   55:              i, list[i]->name, list[i]->id);
   56: 
   57:     return 0;
   58:   }
   59:   else if(isdigit((int)(unsigned char)*name)) {
   60:     int id = atoi(name);
   61: 
   62:     result = curl_global_sslset((curl_sslbackend)id, NULL, NULL);
   63:   }
   64:   else
   65:     result = curl_global_sslset(-1, name, NULL);
   66: 
   67:   if(result == CURLSSLSET_UNKNOWN_BACKEND) {
   68:     fprintf(stderr, "Unknown SSL backend id: %s\n", name);
   69:     return 1;
   70:   }
   71: 
   72:   assert(result == CURLSSLSET_OK);
   73: 
   74:   printf("Version with SSL backend '%s':\n\n\t%s\n", name, curl_version());
   75: 
   76:   return 0;
   77: }