/*
 * Copyright (C) 1997-1999 Matt Newman <[email protected]>
 * some modifications:
 *	Copyright (C) 2000 Ajuba Solutions
 *	Copyright (C) 2002 ActiveState Corporation
 *	Copyright (C) 2004 Starfish Systems 
 *
 * $Header: /home/rkeene/tmp/cvs2fossil/../tcltls/tls/tls/tls.c,v 1.32 2012/06/01 22:59:03 andreas_kupries Exp $
 *
 * TLS (aka SSL) Channel - can be layered on any bi-directional
 * Tcl_Channel (Note: Requires Trf Core Patch)
 *
 * This was built (almost) from scratch based upon observation of
 * OpenSSL 0.9.2B
 *

#ifndef STACK_OF
#define STACK_OF(x)			STACK
#define sk_SSL_CIPHER_num(sk)		sk_num((sk))
#define sk_SSL_CIPHER_value( sk, index)	(SSL_CIPHER*)sk_value((sk), (index))
#endif

/*
 * Thread-Safe TLS Code
 */

#ifdef TCL_THREADS
#define OPENSSL_THREAD_DEFINES
#include <openssl/opensslconf.h>

#ifdef OPENSSL_THREADS
#include <openssl/crypto.h>

/*
 * Threaded operation requires locking callbacks
 * Based from /crypto/cryptlib.c of OpenSSL and NSOpenSSL.
 */

static Tcl_Mutex locks[CRYPTO_NUM_LOCKS];

static void          CryptoThreadLockCallback (int mode, int n, const char *file, int line);
static unsigned long CryptoThreadIdCallback   (void);

static void
CryptoThreadLockCallback(int mode, int n, const char *file, int line)
{
    if (mode & CRYPTO_LOCK) {
       Tcl_MutexLock(&locks[n]);
    } else {
       Tcl_MutexUnlock(&locks[n]);
    }
}

static unsigned long
CryptoThreadIdCallback(void)
{
    return (unsigned long) Tcl_GetCurrentThread();
}
#endif /* OPENSSL_THREADS */
#endif /* TCL_THREADS */


/*
 *-------------------------------------------------------------------
 *
 * InfoCallback --
 *
 *	monitors SSL connection process

int
Tls_Init(Tcl_Interp *interp)		/* Interpreter in which the package is
					 * to be made available. */
{
    int major, minor, patchlevel, release, i;
    char rnd_seed[16] = "GrzSlplKqUdnnzP!";	/* 16 bytes */
#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
    size_t num_locks;
#endif

    /*
     * The original 8.2.0 stacked channel implementation (and the patch
     * that preceded it) had problems with scalability and robustness.
     * These were address in 8.3.2 / 8.4a2, so we now require that as a
     * minimum for TLS 1.4+.  We only support 8.2+ now (8.3.2+ preferred).
     */

	    (release == TCL_FINAL_RELEASE) && (patchlevel >= 2))))) {
	/* 8.3.2+ */
	channelTypeVersion = TLS_CHANNEL_VERSION_2;
    } else {
	/* 8.2.0 - 8.3.1 */
	channelTypeVersion = TLS_CHANNEL_VERSION_1;
    }

    if (CRYPTO_set_mem_functions((void *(*)(size_t))Tcl_Alloc,
				 (void *(*)(void *, size_t))Tcl_Realloc,
				 (void(*)(void *))Tcl_Free) == 0) {
       /* Not using Tcl's mem functions ... not critical */
    }

#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
    /* should we consider allocating mutexes? */
    num_locks = CRYPTO_num_locks();
    if (num_locks > CRYPTO_NUM_LOCKS) {
       Tcl_AppendResult(interp, "crypto num locks size error", NULL);
       return TCL_ERROR;
    }

    CRYPTO_set_locking_callback(CryptoThreadLockCallback);
    CRYPTO_set_id_callback(CryptoThreadIdCallback);
#endif

    if (SSL_library_init() != 1) {
	Tcl_AppendResult(interp, "could not initialize SSL library", NULL);
	return TCL_ERROR;
    }
    SSL_load_error_strings();
    ERR_load_crypto_strings();