https-common.c

/* (c)  Oblong Industries */

#include <signal.h>

#include "https-common.h"

#include <openssl/ssl.h>
#include <openssl/err.h>

#include <event2/event.h>

void die_most_horribly_from_openssl_error (const char *func)
{ fprintf (stderr, "%s failed:\n", func);

  /* This is the OpenSSL function that prints the contents of the
   * error stack to the specified file handle. */
  ERR_print_errors_fp (stderr);

  exit (EXIT_FAILURE);
}

void error_exit (const char *fmt, ...)
{ va_list ap;

  va_start (ap, fmt);
  vfprintf (stderr, fmt, ap);
  va_end (ap);

  exit (EXIT_FAILURE);
}

/* OpenSSL has a habit of using uninitialized memory.  (They turn up their
 * nose at tools like valgrind.)  To avoid spurious valgrind errors (as well
 * as to allay any concerns that the uninitialized memory is actually
 * affecting behavior), let's install a custom malloc function which is
 * actually calloc.
 */
static void *my_zeroing_malloc (size_t howmuch)
{ return calloc (1, howmuch); }

void common_setup (void)
{ signal (SIGPIPE, SIG_IGN);

  CRYPTO_set_mem_functions (my_zeroing_malloc, realloc, free);
  SSL_library_init ();
  SSL_load_error_strings ();
  OpenSSL_add_all_algorithms ();

  printf ("Using OpenSSL version \"%s\"\nand libevent version \"%s\"\n",
          SSLeay_version (SSLEAY_VERSION),
          event_get_version ());
}