[apple/security.git] / CdsaUtils / cuTimeStr.cpp

/*
 * Copyright (c) 2002 Apple Computer, Inc. All Rights Reserved.
 * 
 * The contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License. Please obtain
 * a copy of the License at http://www.apple.com/publicsource and read it before
 * using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
 * specific language governing rights and limitations under the License.
 */
 
/*
 * cuTimeStr.cpp - time string routines
 */
#include "cuTimeStr.h" 
#include "cuCdsaUtils.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <Security/threading.h>

/*
 * Given a string containing either a UTC-style or "generalized time"
 * time string, convert to a struct tm (in GMT/UTC). Returns nonzero on
 * error. 
 */
int cuTimeStringToTm(
	const char			*str,
	unsigned			len,
	struct tm			*tmp)
{
	char 		szTemp[5];
	unsigned 	isUtc;
	unsigned 	x;
	unsigned 	i;
	char 		*cp;

	if((str == NULL) || (len == 0) || (tmp == NULL)) {
    	return 1;
  	}
  	
  	/* tolerate NULL terminated or not */
  	if(str[len - 1] == '\0') {
  		len--;
  	}
  	switch(len) {
  		case UTC_TIME_STRLEN:			// 2-digit year, not Y2K compliant
  			isUtc = 1;
  			break;
  		case GENERALIZED_TIME_STRLEN:	// 4-digit year
  			isUtc = 0;
  			break;
  		default:						// unknown format 
  			return 1;
  	}
  	
  	cp = (char *)str;
  	
	/* check that all characters except last are digits */
	for(i=0; i<(len - 1); i++) {
		if ( !(isdigit(cp[i])) ) {
		  	return 1;
		}
	}

  	/* check last character is a 'Z' */
  	if(cp[len - 1] != 'Z' )	{
		return 1;
  	}

  	/* YEAR */
	szTemp[0] = *cp++;
	szTemp[1] = *cp++;
	if(!isUtc) {
		/* two more digits */
		szTemp[2] = *cp++;
		szTemp[3] = *cp++;
		szTemp[4] = '\0';
	}
	else { 
		szTemp[2] = '\0';
	}
	x = atoi( szTemp );
	if(isUtc) {
		/* 
		 * 2-digit year. 
		 *   0  <= year <  50 : assume century 21
		 *   50 <= year <  70 : illegal per PKIX, though we tolerate
		 *   70 <  year <= 99 : assume century 20
		 */
		if(x < 50) {
			x += 2000;
		}
		/*
		else if(x < 70) {
			return 1;
		}
		*/
		else {
			/* century 20 */
			x += 1900;			
		}
	}
  	/* by definition - tm_year is year - 1900 */
  	tmp->tm_year = x - 1900;

  	/* MONTH */
	szTemp[0] = *cp++;
	szTemp[1] = *cp++;
	szTemp[2] = '\0';
	x = atoi( szTemp );
	/* in the string, months are from 1 to 12 */
	if((x > 12) || (x <= 0)) {
    	return 1;
	}
	/* in a tm, 0 to 11 */
  	tmp->tm_mon = x - 1;

 	/* DAY */
	szTemp[0] = *cp++;
	szTemp[1] = *cp++;
	szTemp[2] = '\0';
	x = atoi( szTemp );
	/* 1..31 in both formats */
	if((x > 31) || (x <= 0)) {
		return 1;
	}
  	tmp->tm_mday = x;

	/* HOUR */
	szTemp[0] = *cp++;
	szTemp[1] = *cp++;
	szTemp[2] = '\0';
	x = atoi( szTemp );
	if((x > 23) || (x < 0)) {
		return 1;
	}
	tmp->tm_hour = x;

  	/* MINUTE */
	szTemp[0] = *cp++;
	szTemp[1] = *cp++;
	szTemp[2] = '\0';
	x = atoi( szTemp );
	if((x > 59) || (x < 0)) {
		return 1;
	}
  	tmp->tm_min = x;

  	/* SECOND */
	szTemp[0] = *cp++;
	szTemp[1] = *cp++;
	szTemp[2] = '\0';
  	x = atoi( szTemp );
	if((x > 59) || (x < 0)) {
		return 1;
	}
  	tmp->tm_sec = x;
	return 0;
}

#define MAX_TIME_STR_LEN  	30

static Mutex timeMutex;		// protects time(), gmtime()

char *cuTimeAtNowPlus(int secFromNow, 
	timeSpec spec)
{
	struct tm utc;
	char *outStr;
	time_t baseTime;
	
	timeMutex.lock();
	baseTime = time(NULL);
	baseTime += (time_t)secFromNow;
	utc = *gmtime(&baseTime);
	timeMutex.unlock();
	
	outStr = (char *)APP_MALLOC(MAX_TIME_STR_LEN);
	
	switch(spec) {
		case TIME_UTC:
			/* UTC - 2 year digits - code which parses this assumes that
			 * (2-digit) years between 0 and 49 are in century 21 */
			if(utc.tm_year >= 100) {
				utc.tm_year -= 100;
			}
			sprintf(outStr, "%02d%02d%02d%02d%02d%02dZ",
				utc.tm_year /* + 1900 */, utc.tm_mon + 1,
				utc.tm_mday, utc.tm_hour, utc.tm_min, utc.tm_sec);
			break;
		case TIME_GEN:
			sprintf(outStr, "%04d%02d%02d%02d%02d%02dZ",
				/* note year is relative to 1900, hopefully it'll 
				 * have four valid digits! */
				utc.tm_year + 1900, utc.tm_mon + 1,
				utc.tm_mday, utc.tm_hour, utc.tm_min, utc.tm_sec);
			break;
		case TIME_CSSM:
			sprintf(outStr, "%04d%02d%02d%02d%02d%02d",
				/* note year is relative to 1900, hopefully it'll have 
				 * four valid digits! */
				utc.tm_year + 1900, utc.tm_mon + 1,
				utc.tm_mday, utc.tm_hour, utc.tm_min, utc.tm_sec);
			break;
	}
	return outStr;
}

/*
 * Convert a CSSM_X509_TIME, which can be in any of three forms (UTC,
 * generalized, or CSSM_TIMESTRING) into a CSSM_TIMESTRING. Caller
 * must free() the result. Returns NULL if x509time is badly formed. 
 */
char *cuX509TimeToCssmTimestring(
	const CSSM_X509_TIME 	*x509Time,
	unsigned				*rtnLen)		// for caller's convenience
{
	int len = x509Time->time.Length;
	const char *inStr = (char *)x509Time->time.Data;	
											// not NULL terminated!
	char *rtn;
	
	*rtnLen = 0;
	if((len == 0) || (inStr == NULL)) {
		return NULL;
	}
	rtn = (char *)malloc(CSSM_TIME_STRLEN + 1);
	rtn[0] = '\0';
	switch(len) {
		case UTC_TIME_STRLEN:
		{
			/* infer century and prepend to output */
			char tmp[3];
			int year;
			tmp[0] = inStr[0];
			tmp[1] = inStr[1];
			tmp[2] = '\0';
			year = atoi(tmp);
			
			/* 
			 *   0  <= year <  50 : assume century 21
			 *   50 <= year <  70 : illegal per PKIX
			 *   70 <  year <= 99 : assume century 20
			 */
			if(year < 50) {
				/* century 21 */
				strcpy(rtn, "20");
			}
			else if(year < 70) {
				free(rtn);
				return NULL;
			}
			else {
				/* century 20 */
				strcpy(rtn, "19");
			}
			memmove(rtn + 2, inStr, len - 1);		// don't copy the Z
			break;
		}
		case CSSM_TIME_STRLEN:
			memmove(rtn, inStr, len);				// trivial case
			break;
		case GENERALIZED_TIME_STRLEN:
			memmove(rtn, inStr, len - 1);			// don't copy the Z
			break;
		
		default:
			free(rtn);
			return NULL;
	}
	rtn[CSSM_TIME_STRLEN] = '\0';
	*rtnLen = CSSM_TIME_STRLEN;
	return rtn;
}
Commit	Line	Data
df0e469f A	1	/*
	2	* Copyright (c) 2002 Apple Computer, Inc. All Rights Reserved.
	3	*
	4	* The contents of this file constitute Original Code as defined in and are
	5	* subject to the Apple Public Source License Version 1.2 (the 'License').
	6	* You may not use this file except in compliance with the License. Please obtain
	7	* a copy of the License at http://www.apple.com/publicsource and read it before
	8	* using this file.
	9	*
	10	* This Original Code and all software distributed under the License are
	11	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
	12	* OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
	13	* LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
	14	* PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
	15	* specific language governing rights and limitations under the License.
	16	*/
	17
	18	/*
	19	* cuTimeStr.cpp - time string routines
	20	*/
	21	#include "cuTimeStr.h"
	22	#include "cuCdsaUtils.h"
	23	#include <string.h>
	24	#include <stdlib.h>
	25	#include <stdio.h>
	26	#include <ctype.h>
	27	#include <Security/threading.h>
	28
	29	/*
	30	* Given a string containing either a UTC-style or "generalized time"
	31	* time string, convert to a struct tm (in GMT/UTC). Returns nonzero on
	32	* error.
	33	*/
	34	int cuTimeStringToTm(
	35	const char *str,
	36	unsigned len,
	37	struct tm *tmp)
	38	{
	39	char szTemp[5];
	40	unsigned isUtc;
	41	unsigned x;
	42	unsigned i;
	43	char *cp;
	44
	45	if((str == NULL) \|\| (len == 0) \|\| (tmp == NULL)) {
	46	return 1;
	47	}
	48
	49	/* tolerate NULL terminated or not */
	50	if(str[len - 1] == '\0') {
	51	len--;
	52	}
	53	switch(len) {
	54	case UTC_TIME_STRLEN: // 2-digit year, not Y2K compliant
	55	isUtc = 1;
	56	break;
	57	case GENERALIZED_TIME_STRLEN: // 4-digit year
	58	isUtc = 0;
	59	break;
	60	default: // unknown format
	61	return 1;
	62	}
	63
	64	cp = (char *)str;
65
66	/* check that all characters except last are digits */
67	for(i=0; i<(len - 1); i++) {
68	if ( !(isdigit(cp[i])) ) {
69	return 1;
70	}
71	}
72
73	/* check last character is a 'Z' */
74	if(cp[len - 1] != 'Z' ) {
75	return 1;
76	}
77
78	/* YEAR */
79	szTemp[0] = *cp++;
80	szTemp[1] = *cp++;
81	if(!isUtc) {
82	/* two more digits */
83	szTemp[2] = *cp++;
84	szTemp[3] = *cp++;
85	szTemp[4] = '\0';
86	}
87	else {
88	szTemp[2] = '\0';
89	}
90	x = atoi( szTemp );
91	if(isUtc) {
92	/*
93	* 2-digit year.
94	* 0 <= year < 50 : assume century 21
95	* 50 <= year < 70 : illegal per PKIX, though we tolerate
96	* 70 < year <= 99 : assume century 20
97	*/
98	if(x < 50) {
99	x += 2000;
100	}
101	/*
102	else if(x < 70) {
103	return 1;
104	}
105	*/
106	else {
107	/* century 20 */
108	x += 1900;
109	}
110	}
111	/* by definition - tm_year is year - 1900 */
112	tmp->tm_year = x - 1900;
113
114	/* MONTH */
115	szTemp[0] = *cp++;
116	szTemp[1] = *cp++;
117	szTemp[2] = '\0';
118	x = atoi( szTemp );
119	/* in the string, months are from 1 to 12 */
120	if((x > 12) \|\| (x <= 0)) {
121	return 1;
122	}
123	/* in a tm, 0 to 11 */
124	tmp->tm_mon = x - 1;
125
126	/* DAY */
127	szTemp[0] = *cp++;
128	szTemp[1] = *cp++;
129	szTemp[2] = '\0';
130	x = atoi( szTemp );
131	/* 1..31 in both formats */
132	if((x > 31) \|\| (x <= 0)) {
133	return 1;
134	}
135	tmp->tm_mday = x;
136
137	/* HOUR */
138	szTemp[0] = *cp++;
139	szTemp[1] = *cp++;
140	szTemp[2] = '\0';
141	x = atoi( szTemp );
142	if((x > 23) \|\| (x < 0)) {
143	return 1;
144	}
145	tmp->tm_hour = x;
146
147	/* MINUTE */
148	szTemp[0] = *cp++;
149	szTemp[1] = *cp++;
150	szTemp[2] = '\0';
151	x = atoi( szTemp );
152	if((x > 59) \|\| (x < 0)) {
153	return 1;
154	}
155	tmp->tm_min = x;
156
157	/* SECOND */
158	szTemp[0] = *cp++;
159	szTemp[1] = *cp++;
160	szTemp[2] = '\0';
161	x = atoi( szTemp );
162	if((x > 59) \|\| (x < 0)) {
163	return 1;
164	}
165	tmp->tm_sec = x;
166	return 0;
167	}
168
169	#define MAX_TIME_STR_LEN 30
170
171	static Mutex timeMutex; // protects time(), gmtime()
172
173	char *cuTimeAtNowPlus(int secFromNow,
174	timeSpec spec)
175	{
176	struct tm utc;
177	char *outStr;
178	time_t baseTime;
179
180	timeMutex.lock();
181	baseTime = time(NULL);
182	baseTime += (time_t)secFromNow;
183	utc = *gmtime(&baseTime);
184	timeMutex.unlock();
185
186	outStr = (char *)APP_MALLOC(MAX_TIME_STR_LEN);
187
188	switch(spec) {
189	case TIME_UTC:
190	/* UTC - 2 year digits - code which parses this assumes that
191	* (2-digit) years between 0 and 49 are in century 21 */
192	if(utc.tm_year >= 100) {
193	utc.tm_year -= 100;
194	}
195	sprintf(outStr, "%02d%02d%02d%02d%02d%02dZ",
196	utc.tm_year /* + 1900 */, utc.tm_mon + 1,
197	utc.tm_mday, utc.tm_hour, utc.tm_min, utc.tm_sec);
198	break;
199	case TIME_GEN:
200	sprintf(outStr, "%04d%02d%02d%02d%02d%02dZ",
201	/* note year is relative to 1900, hopefully it'll
202	* have four valid digits! */
203	utc.tm_year + 1900, utc.tm_mon + 1,
204	utc.tm_mday, utc.tm_hour, utc.tm_min, utc.tm_sec);
205	break;
206	case TIME_CSSM:
207	sprintf(outStr, "%04d%02d%02d%02d%02d%02d",
208	/* note year is relative to 1900, hopefully it'll have
209	* four valid digits! */
210	utc.tm_year + 1900, utc.tm_mon + 1,
211	utc.tm_mday, utc.tm_hour, utc.tm_min, utc.tm_sec);
212	break;
213	}
214	return outStr;
215	}
216
217	/*
218	* Convert a CSSM_X509_TIME, which can be in any of three forms (UTC,
219	* generalized, or CSSM_TIMESTRING) into a CSSM_TIMESTRING. Caller
220	* must free() the result. Returns NULL if x509time is badly formed.
221	*/
222	char *cuX509TimeToCssmTimestring(
223	const CSSM_X509_TIME *x509Time,
224	unsigned *rtnLen) // for caller's convenience
225	{
226	int len = x509Time->time.Length;
227	const char inStr = (char )x509Time->time.Data;
228	// not NULL terminated!
229	char *rtn;
230
231	*rtnLen = 0;
232	if((len == 0) \|\| (inStr == NULL)) {
233	return NULL;
234	}
235	rtn = (char *)malloc(CSSM_TIME_STRLEN + 1);
236	rtn[0] = '\0';
237	switch(len) {
238	case UTC_TIME_STRLEN:
239	{
240	/* infer century and prepend to output */
241	char tmp[3];
242	int year;
243	tmp[0] = inStr[0];
244	tmp[1] = inStr[1];
245	tmp[2] = '\0';
246	year = atoi(tmp);
247
248	/*
249	* 0 <= year < 50 : assume century 21
250	* 50 <= year < 70 : illegal per PKIX
251	* 70 < year <= 99 : assume century 20
252	*/
253	if(year < 50) {
254	/* century 21 */
255	strcpy(rtn, "20");
256	}
257	else if(year < 70) {
258	free(rtn);
259	return NULL;
260	}
261	else {
262	/* century 20 */
263	strcpy(rtn, "19");
264	}
265	memmove(rtn + 2, inStr, len - 1); // don't copy the Z
266	break;
267	}
268	case CSSM_TIME_STRLEN:
269	memmove(rtn, inStr, len); // trivial case
270	break;
271	case GENERALIZED_TIME_STRLEN:
272	memmove(rtn, inStr, len - 1); // don't copy the Z
273	break;
274
275	default:
276	free(rtn);
277	return NULL;
278	}
279	rtn[CSSM_TIME_STRLEN] = '\0';
280	*rtnLen = CSSM_TIME_STRLEN;
281	return rtn;
282	}
283