From 3bb39fbda84fe1081ab4d936520ea906fd069d06 Mon Sep 17 00:00:00 2001
From: Alexander Chemeris <Alexander.Chemeris@gmail.com>
Date: Tue, 26 Nov 2013 16:43:10 -0600
Subject: [PATCH 1/6] sms: Proper decoding and storage of SMS validity period.
- Use time_t instead of abstract minutes to store validity time to make sure we support all possible values.
- Return UNIX time from it to support both relative and absolute expire times.
- Pass a current time to gsm340_validity_period() to compute the absolute expire time if a relative time is specified. What time is "current" is to be decided by callers.
- We also introduce SMS_DEFAULT_VALIDITY_PERIOD macros to reduce number of magic values.
---
include/osmocom/gsm/gsm0411_utils.h | 7 ++-
src/gsm/gsm0411_utils.c | 83 +++++++++++++++--------------------
2 files changed, 41 insertions(+), 49 deletions(-)
@@ -3,6 +3,9 @@
#include <time.h>
+/* Default SMS validity period is 2 days */
+#define SMS_DEFAULT_VALIDITY_PERIOD (2 * 24 * 60 * 60)
+
/* Turn int into semi-octet representation: 98 => 0x89 */
uint8_t gsm411_bcdify(uint8_t value);
@@ -17,8 +20,8 @@ void gsm340_gen_scts(uint8_t *scts, time_t time);
/* Decode 03.40 TP-SCTS (into utc/gmt timestamp) */
time_t gsm340_scts(uint8_t *scts);
-/* decode validity period. return minutes */
-unsigned long gsm340_validity_period(uint8_t sms_vpf, uint8_t *sms_vp);
+/* decode validity period. return absolute time */
+time_t gsm340_validity_period(time_t now, uint8_t sms_vpf, uint8_t *sms_vp);
/* determine coding alphabet dependent on GSM 03.38 Section 4 DCS */
enum sms_alphabet gsm338_get_sms_alphabet(uint8_t dcs);
@@ -7,6 +7,7 @@
* (C) 2010-2013 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by On-Waves
* (C) 2011 by Andreas Eversberg <jolly@eversberg.eu>
+ * (C) 2014 by Alexander Chemeris <Alexander.Chemeris@fairwaves.co>
*
* All Rights Reserved
*
@@ -34,6 +35,7 @@
#include <osmocom/gsm/gsm48.h>
#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gsm/gsm0411_utils.h>
#include <osmocom/gsm/protocol/gsm_03_40.h>
#include <osmocom/gsm/protocol/gsm_04_11.h>
@@ -120,21 +122,13 @@ time_t gsm340_scts(uint8_t *scts)
return mktime(&tm) - ofs;
}
-/* Return the default validity period in minutes */
-static unsigned long gsm340_vp_default(void)
-{
- unsigned long minutes;
- /* Default validity: two days */
- minutes = 24 * 60 * 2;
- return minutes;
-}
-
-/* Decode validity period format 'relative' */
-static unsigned long gsm340_vp_relative(uint8_t *sms_vp)
+/* Decode validity period format 'relative'.
+ * Returns number of seconds relative to a current time. */
+static time_t gsm340_vp_relative(uint8_t *sms_vp)
{
/* Chapter 9.2.3.12.1 */
uint8_t vp;
- unsigned long minutes;
+ time_t minutes;
vp = *(sms_vp);
if (vp <= 143)
@@ -145,58 +139,53 @@ static unsigned long gsm340_vp_relative(uint8_t *sms_vp)
minutes = vp-166 * 60 * 24;
else
minutes = vp-192 * 60 * 24 * 7;
- return minutes;
+
+ /* Convert to seconds */
+ return minutes * 60;
}
-/* Decode validity period format 'absolute' */
-static unsigned long gsm340_vp_absolute(uint8_t *sms_vp)
+/* Decode validity period format 'absolute'.
+ * Returns UNIX time. */
+static time_t gsm340_vp_absolute(uint8_t *sms_vp)
{
/* Chapter 9.2.3.12.2 */
- time_t expires, now;
- unsigned long minutes;
-
- expires = gsm340_scts(sms_vp);
- now = time(NULL);
- if (expires <= now)
- minutes = 0;
- else
- minutes = (expires-now)/60;
- return minutes;
+ return gsm340_scts(sms_vp);
}
-/* Decode validity period format 'relative in integer representation' */
-static unsigned long gsm340_vp_relative_integer(uint8_t *sms_vp)
+/* Decode validity period format 'relative in integer representation'.
+ * Returns number of seconds relative to a current time. */
+static time_t gsm340_vp_relative_integer(uint8_t *sms_vp)
{
uint8_t vp;
- unsigned long minutes;
vp = *(sms_vp);
if (vp == 0) {
LOGP(DLSMS, LOGL_ERROR,
"reserved relative_integer validity period\n");
- return gsm340_vp_default();
+#warning We should return an RP-Error here.
+ return SMS_DEFAULT_VALIDITY_PERIOD;
}
- minutes = vp/60;
- return minutes;
+ return vp;
}
-/* Decode validity period format 'relative in semi-octet representation' */
-static unsigned long gsm340_vp_relative_semioctet(uint8_t *sms_vp)
+/* Decode validity period format 'relative in semi-octet representation'.
+ * Returns number of seconds relative to a current time. */
+static time_t gsm340_vp_relative_semioctet(uint8_t *sms_vp)
{
- unsigned long minutes;
- minutes = gsm411_unbcdify(*sms_vp++)*60; /* hours */
- minutes += gsm411_unbcdify(*sms_vp++); /* minutes */
- minutes += gsm411_unbcdify(*sms_vp++)/60; /* seconds */
- return minutes;
+ time_t hours, minutes, seconds;
+ hours = gsm411_unbcdify(*sms_vp++); /* hours */
+ minutes = gsm411_unbcdify(*sms_vp++); /* minutes */
+ seconds = gsm411_unbcdify(*sms_vp++); /* seconds */
+ return hours*60*60 + minutes*60 + seconds;
}
-/* decode validity period. return minutes */
-unsigned long gsm340_validity_period(uint8_t sms_vpf, uint8_t *sms_vp)
+/* Decode validity period. Returns absolute UNIX time. */
+time_t gsm340_validity_period(time_t now, uint8_t sms_vpf, uint8_t *sms_vp)
{
uint8_t fi; /* functionality indicator */
switch (sms_vpf) {
case GSM340_TP_VPF_RELATIVE:
- return gsm340_vp_relative(sms_vp);
+ return now + gsm340_vp_relative(sms_vp);
case GSM340_TP_VPF_ABSOLUTE:
return gsm340_vp_absolute(sms_vp);
case GSM340_TP_VPF_ENHANCED:
@@ -207,23 +196,23 @@ unsigned long gsm340_validity_period(uint8_t sms_vpf, uint8_t *sms_vp)
/* read validity period format */
switch (fi & 0x7) {
case 0x0:
- return gsm340_vp_default(); /* no vpf specified */
+ return now + SMS_DEFAULT_VALIDITY_PERIOD; /* no vpf specified */
case 0x1:
- return gsm340_vp_relative(sms_vp);
+ return now + gsm340_vp_relative(sms_vp);
case 0x2:
- return gsm340_vp_relative_integer(sms_vp);
+ return now + gsm340_vp_relative_integer(sms_vp);
case 0x3:
- return gsm340_vp_relative_semioctet(sms_vp);
+ return now + gsm340_vp_relative_semioctet(sms_vp);
default:
/* The GSM spec says that the SC should reject any
unsupported and/or undefined values. FIXME */
LOGP(DLSMS, LOGL_ERROR,
"Reserved enhanced validity period format\n");
- return gsm340_vp_default();
+ return now + SMS_DEFAULT_VALIDITY_PERIOD;
}
case GSM340_TP_VPF_NONE:
default:
- return gsm340_vp_default();
+ return now + SMS_DEFAULT_VALIDITY_PERIOD;
}
}
--
1.7.9.5