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/* (C) 2012-2022 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <time.h>
#include <osmocom/core/logging.h>
#include <osmocom/netif/stream.h>
#include <osmocom/smpp/smpp_smsc.h>
/*! \brief retrieve SMPP command ID from a msgb */
uint32_t smpp_msgb_cmdid(struct msgb *msg)
{
uint8_t *tmp = msgb_data(msg) + 4;
return ntohl(*(uint32_t *)tmp);
}
int smpp_determine_scheme(uint8_t dcs, uint8_t *data_coding, int *mode)
{
if ((dcs & 0xF0) == 0xF0) {
if (dcs & 0x04) {
/* bit 2 == 1: 8bit data */
*data_coding = 0x02;
*mode = MODE_8BIT;
} else {
/* bit 2 == 0: default alphabet */
*data_coding = 0x01;
*mode = MODE_7BIT;
}
} else if ((dcs & 0xE0) == 0) {
switch (dcs & 0xC) {
case 0:
*data_coding = 0x01;
*mode = MODE_7BIT;
break;
case 4:
*data_coding = 0x02;
*mode = MODE_8BIT;
break;
case 8:
*data_coding = 0x08; /* UCS-2 */
*mode = MODE_8BIT;
break;
default:
goto unknown_mo;
}
} else {
unknown_mo:
LOGP(DLSMS, LOGL_ERROR, "SMPP MO Unknown Data Coding 0x%02x\n", dcs);
return -1;
}
return 0;
}
/* convert a 'struct tm' holding relative time to an absolute one by adding it to t_now */
static void relative2absolute(struct tm *tm, time_t t_now)
{
struct tm tm_now;
localtime_r(&t_now, &tm_now);
tm->tm_year += tm_now.tm_year;
tm->tm_mon += tm_now.tm_mon;
tm->tm_mday += tm_now.tm_mday;
tm->tm_hour += tm_now.tm_hour;
tm->tm_min += tm_now.tm_min;
tm->tm_sec += tm_now.tm_sec;
}
#ifndef HAVE_TIMEGM
/* for systems without a timegm() function, provide a reimplementation */
static time_t timegm(struct tm *tm)
{
const char *orig_tz = getenv("TZ");
time_t ret;
setenv("TZ", "UTC", 1);
ret = mktime(tm);
if (orig_tz)
setenv("TZ", orig_tz, 1);
else
unsetenv("TZ");
return ret;
}
#endif
/*! Parse a SMPP time format as defined in SMPP v3.4 7.1.1.
* \param[in] vp string containing the time as encoded in SMPP v3.4
* \param[in] t_now pointer to a time value for 'now'. Can be NULL, then we call time() ourselves.
* \returns time_t value in seconds since the epoch of the absolute decoded time */
time_t smpp_parse_time_format(const char *vp, time_t *t_now)
{
unsigned int year, month, day, hour, minute, second, tenth, gmt_off_quarter;
char plus_minus_relative;
int gmt_off_minutes;
struct tm tm;
time_t ret;
int rc;
memset(&tm, 0, sizeof(tm));
if (vp[0] == '\0')
return 0;
/* YYMMDDhhmmsstnnp (where p can be -, + or R) */
rc = sscanf(vp, "%2u%2u%2u%2u%2u%2u%1u%2u%c", &year, &month, &day, &hour, &minute,
&second, &tenth, &gmt_off_quarter, &plus_minus_relative);
if (rc != 9)
return (time_t) -1;
tm.tm_year = year;
/* month handling differs between absolute/relative below... */
tm.tm_mday = day;
tm.tm_hour = hour;
tm.tm_min = minute;
tm.tm_sec = second;
tm.tm_isdst = 0;
switch (plus_minus_relative) {
case '+': /* time is in quarter hours advanced compared to UTC */
if (year < 70)
tm.tm_year += 100;
tm.tm_mon = month - 1;
gmt_off_minutes = 15 * gmt_off_quarter;
tm.tm_min -= gmt_off_minutes;
ret = timegm(&tm);
break;
case '-': /* time is in quarter hours retared compared to UTC */
if (year < 70)
tm.tm_year += 100;
tm.tm_mon = month - 1;
gmt_off_minutes = 15 * gmt_off_quarter;
tm.tm_min += gmt_off_minutes;
ret = timegm(&tm);
break;
case 'R':
/* relative time */
tm.tm_mon = month;
if (t_now)
relative2absolute(&tm, *t_now);
else
relative2absolute(&tm, time(NULL));
/* here we do want local time, as we're passing local time in above! */
ret = mktime(&tm);
break;
default:
return (time_t) -1;
}
return ret;
}
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