/*

 * Copyright (c) 2011 Collabora Ltd.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *     * Redistributions of source code must retain the above

 *       copyright notice, this list of conditions and the

 *       following disclaimer.

 *     * Redistributions in binary form must reproduce the

 *       above copyright notice, this list of conditions and

 *       the following disclaimer in the documentation and/or

 *       other materials provided with the distribution.

 *     * The names of contributors to this software may not be

 *       used to endorse or promote products derived from this

 *       software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,

 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS

 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF

 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 *

 *

 * CONTRIBUTORS

 *  Stef Walter <stef@memberwebs.com>

 */

#include "config.h"

#include "compat.h"

#include "debug.h"

#include <assert.h>

#ifdef HAVE_LOCALE_H

#include <locale.h>

#endif

#include <stdio.h>

#include <stdarg.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#define P11_DEBUG_MESSAGE_MAX 512

struct DebugKey {

  const char *name;

  int value;

};

static struct DebugKey debug_keys[] = {

  { "lib", P11_DEBUG_LIB },

  { "conf", P11_DEBUG_CONF },

  { "uri", P11_DEBUG_URI },

  { "proxy", P11_DEBUG_PROXY },

  { "trust", P11_DEBUG_TRUST },

  { "tool", P11_DEBUG_TOOL },

  { "rpc", P11_DEBUG_RPC },

  { 0, }

};

static bool debug_strict = false;

/* global variable exported in debug.h */

int p11_debug_current_flags = ~0;

#ifdef HAVE_STRERROR_L

extern locale_t p11_message_locale;

#endif

static int

parse_environ_flags (void)

{

  const char *env;

  int result = 0;

  const char *p;

  const char *q;

  int i;

  env = secure_getenv ("P11_KIT_STRICT");

  if (env && env[0] != '\0')

    debug_strict = true;

  env = getenv ("P11_KIT_DEBUG");

  if (!env)

    return 0;

  if (strcmp (env, "all") == 0) {

    for (i = 0; debug_keys[i].name; i++)

      result |= debug_keys[i].value;

  } else if (strcmp (env, "help") == 0) {

    fprintf (stderr, "Supported debug values:");

    for (i = 0; debug_keys[i].name; i++)

      fprintf (stderr, " %s", debug_keys[i].name);

    fprintf (stderr, "\n");

  } else {

    p = env;

    while (*p) {

      q = strpbrk (p, ":;, \t");

      if (!q)

        q = p + strlen (p);

      for (i = 0; debug_keys[i].name; i++) {

        if (q - p == strlen (debug_keys[i].name) &&

            strncmp (debug_keys[i].name, p, q - p) == 0)

          result |= debug_keys[i].value;

      }

      p = q;

      if (*p)

        p++;

    }

  }

  return result;

}

void

p11_debug_init (void)

{

  p11_debug_current_flags = parse_environ_flags ();

}

void

p11_debug_message (int flag,

                    const char *format, ...)

{

  va_list args;

  if (flag & p11_debug_current_flags) {

    fprintf (stderr, "(p11-kit:%d) ", getpid());

    va_start (args, format);

    vfprintf (stderr, format, args);

    va_end (args);

    fprintf (stderr, "\n");

  }

}

void

p11_debug_message_err (int flag,

           int errnum,

           const char *format, ...)

{

  va_list args;

  char strerr[P11_DEBUG_MESSAGE_MAX];

  if (flag & p11_debug_current_flags) {

    fprintf (stderr, "(p11-kit:%d) ", getpid());

    va_start (args, format);

    vfprintf (stderr, format, args);

    va_end (args);

    snprintf (strerr, sizeof (strerr), "Unknown error %d", errnum);

#ifdef HAVE_STRERROR_L

    if (p11_message_locale != (locale_t) 0)

      strncpy (strerr, strerror_l (errnum, p11_message_locale), sizeof (strerr));

#else

    p11_strerror_r (errnum, strerr, sizeof (strerr));

#endif

    strerr[P11_DEBUG_MESSAGE_MAX - 1] = 0;

    fprintf (stderr, ": %s\n", strerr);

  }

}

void

p11_debug_precond (const char *format,

                    ...)

{

  va_list va;

  va_start (va, format);

  vfprintf (stderr, format, va);

  va_end (va);

#ifdef __COVERITY__

  fprintf (stderr, "ignoring P11_KIT_STRICT under coverity: %d", (int)debug_strict);

#else

  if (debug_strict)

#endif

    abort ();

}