diff options
Diffstat (limited to 'src/libmsc/smpp_utils.c')
| -rw-r--r-- | src/libmsc/smpp_utils.c | 107 |
1 files changed, 106 insertions, 1 deletions
diff --git a/src/libmsc/smpp_utils.c b/src/libmsc/smpp_utils.c index 7fffdd27a..3c7757b9a 100644 --- a/src/libmsc/smpp_utils.c +++ b/src/libmsc/smpp_utils.c @@ -1,5 +1,5 @@ -/* (C) 2012-2013 by Harald Welte <laforge@gnumonks.org> +/* (C) 2012-2022 by Harald Welte <laforge@gnumonks.org> * * All Rights Reserved * @@ -17,6 +17,9 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include "config.h" + +#include <time.h> #include "smpp_smsc.h" #include <osmocom/core/logging.h> @@ -59,3 +62,105 @@ unknown_mo: 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; +} |