/** 
 * XML Security Library (http://www.aleksey.com/xmlsec).
 *
 * General functions.
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 * 
 * Copyright (C) 2002-2003 Aleksey Sanin <aleksey@aleksey.com>
 */
#include "globals.h"

#include <stdlib.h>
#include <stdio.h>

#include <libxml/tree.h>

#include <xmlsec/xmlsec.h>
#include <xmlsec/xmltree.h>
#include <xmlsec/keys.h>
#include <xmlsec/transforms.h>
#include <xmlsec/app.h>
#include <xmlsec/io.h>
#include <xmlsec/xkms.h>
#include <xmlsec/errors.h>

/**
 * xmlSecInit:
 *
 * Initializes XML Security Library. The depended libraries
 * (LibXML and LibXSLT) must be initialized before.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecInit(void) {
    xmlSecErrorsInit();
    xmlSecIOInit();
    
#ifndef XMLSEC_NO_CRYPTO_DYNAMIC_LOADING
    if(xmlSecCryptoDLInit() < 0) {
	xmlSecError(XMLSEC_ERRORS_HERE,
		    NULL,
		    "xmlSecCryptoDLInit",
		    XMLSEC_ERRORS_R_XMLSEC_FAILED,
		    XMLSEC_ERRORS_NO_MESSAGE);
	return(-1);
    }
#endif /* XMLSEC_NO_CRYPTO_DYNAMIC_LOADING */
    
    if(xmlSecKeyDataIdsInit() < 0) {
	xmlSecError(XMLSEC_ERRORS_HERE,
		    NULL,
		    "xmlSecKeyDataIdsInit",
		    XMLSEC_ERRORS_R_XMLSEC_FAILED,
		    XMLSEC_ERRORS_NO_MESSAGE);
	return(-1);
    }
    
    if(xmlSecTransformIdsInit() < 0) {
	xmlSecError(XMLSEC_ERRORS_HERE,
		    NULL,
		    "xmlSecTransformIdsInit",
		    XMLSEC_ERRORS_R_XMLSEC_FAILED,
		    XMLSEC_ERRORS_NO_MESSAGE);
	return(-1);
    }
    
#ifndef XMLSEC_NO_XKMS    
    if(xmlSecXkmsRespondWithIdsInit() < 0) {
	xmlSecError(XMLSEC_ERRORS_HERE,
		    NULL,
		    "xmlSecXkmsRespondWithIdsInit",
		    XMLSEC_ERRORS_R_XMLSEC_FAILED,
		    XMLSEC_ERRORS_NO_MESSAGE);
	return(-1);
    }
    if(xmlSecXkmsServerRequestIdsInit() < 0) {
	xmlSecError(XMLSEC_ERRORS_HERE,
		    NULL,
		    "xmlSecXkmsServerRequestIdsInit",
		    XMLSEC_ERRORS_R_XMLSEC_FAILED,
		    XMLSEC_ERRORS_NO_MESSAGE);
	return(-1);
    }
#endif /* XMLSEC_NO_XKMS */

    /* we use rand() function to generate id attributes */
    srand(time(NULL));
    return(0);
}

/**
 * xmlSecShutdown:
 *
 * Clean ups the XML Security Library.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecShutdown(void) {
    int res = 0;    

#ifndef XMLSEC_NO_XKMS    
    xmlSecXkmsServerRequestIdsShutdown();
    xmlSecXkmsRespondWithIdsShutdown();
#endif /* XMLSEC_NO_XKMS */

    xmlSecTransformIdsShutdown();
    xmlSecKeyDataIdsShutdown();

#ifndef XMLSEC_NO_CRYPTO_DYNAMIC_LOADING
    if(xmlSecCryptoDLShutdown() < 0) {
	xmlSecError(XMLSEC_ERRORS_HERE,
		    NULL,
		    "xmlSecCryptoDLShutdown",
		    XMLSEC_ERRORS_R_XMLSEC_FAILED,
		    XMLSEC_ERRORS_NO_MESSAGE);
	res = -1;
    }
#endif /* XMLSEC_NO_CRYPTO_DYNAMIC_LOADING */

    xmlSecIOShutdown();
    xmlSecErrorsShutdown();    
    return(res);
}

/** 
 * xmlSecCheckVersionExt:
 * @major:		the major version number.
 * @minor:		the minor version number.
 * @subminor:		the subminor version number.
 * @mode:		the version check mode.
 *
 * Checks if the loaded version of xmlsec library could be used.
 *
 * Returns: 1 if the loaded xmlsec library version is OK to use
 * 0 if it is not or a negative value if an error occurs.
 */
int 
xmlSecCheckVersionExt(int major, int minor, int subminor, xmlSecCheckVersionMode mode) {
    /* we always want to have a match for major version number */
    if(major != XMLSEC_VERSION_MAJOR) {
	xmlSecError(XMLSEC_ERRORS_HERE, 
		    NULL,
		    NULL,
		    XMLSEC_ERRORS_R_XMLSEC_FAILED,
		    "expected major version=%d;real major version=%d",
		    XMLSEC_VERSION_MAJOR, major);
	return(0);
    }
    
    switch(mode) {
    case xmlSecCheckVersionExactMatch:
	if((minor != XMLSEC_VERSION_MINOR) || (subminor != XMLSEC_VERSION_SUBMINOR)) {
	    xmlSecError(XMLSEC_ERRORS_HERE, 
			NULL,
			NULL,
			XMLSEC_ERRORS_R_XMLSEC_FAILED,
			"mode=exact;expected minor version=%d;real minor version=%d;expected subminor version=%d;real subminor version=%d",
			XMLSEC_VERSION_MINOR, minor,
			XMLSEC_VERSION_SUBMINOR, subminor);
	    return(0);
	}
	break;
    case xmlSecCheckVersionABICompatible:
	if((minor < XMLSEC_VERSION_MINOR) ||
	   ((minor == XMLSEC_VERSION_MINOR) && 
	    (subminor < XMLSEC_VERSION_SUBMINOR))) {
	    xmlSecError(XMLSEC_ERRORS_HERE, 
			NULL,
			NULL,
			XMLSEC_ERRORS_R_XMLSEC_FAILED,
			"mode=abi compatible;expected minor version=%d;real minor version=%d;expected subminor version=%d;real subminor version=%d",
			XMLSEC_VERSION_MINOR, minor,
			XMLSEC_VERSION_SUBMINOR, subminor);
	    return(0);
	}
	break;
    }
    
    return(1);
}