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8.4.3 Listing the ciphersuites in a priority string

This is a small program to list the enabled ciphersuites by a priority string.

/* This example code is placed in the public domain. */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gnutls/gnutls.h>

static void
print_cipher_suite_list (const char* priorities)
{
    size_t i;
    int ret;
    unsigned int idx;
    const char *name;
    const char *err;
    unsigned char id[2];
    gnutls_protocol_t version;
    gnutls_priority_t pcache;

    if (priorities != NULL)
      {
        printf ("Cipher suites for %s\n", priorities);
        
        ret = gnutls_priority_init(&pcache, priorities, &err);
        if (ret < 0)
          {
            fprintf (stderr, "Syntax error at: %s\n", err);
            exit(1);
          }
      
        for (i=0;;i++)
          {
            ret = gnutls_priority_get_cipher_suite_index(pcache, i, &idx);
            if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) break;
            if (ret == GNUTLS_E_UNKNOWN_CIPHER_SUITE) continue;
            
            name = gnutls_cipher_suite_info(idx, id, NULL, NULL, NULL, &version);
            
            if (name != NULL)
              printf ("%-50s\t0x%02x, 0x%02x\t%s\n",
                      name, (unsigned char) id[0], (unsigned char) id[1],
                      gnutls_protocol_get_name (version));
          }
          
        return;
      }
}

int main(int argc, char** argv)
{
  if (argc > 1)
    print_cipher_suite_list (argv[1]);
}

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