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/*
* Copyright (c) 2002-2019 Balabit
* Copyright (c) 1998-2019 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "timeutils/zoneinfo.h"
#include "timeutils/zonedb.h"
#include "reloc.h"
#include "messages.h"
#include <ctype.h>
#include <string.h>
#define TZCACHE_SIZE 4
#define TZCACHE_SIZE_MASK (TZCACHE_SIZE - 1)
#define TZ_MAGIC "TZif"
const gint64 LOWEST_TIME32 = (gint64)((gint32)0x80000000);
/** Time zone file parser code **/
/*
** TZ file header **
*
* struct tzhead
* {
* char tzh_magic[4]; TZ_MAGIC "TZif"
* char tzh_version[1]; '\0' or '2' or '3' as of 2013
* char tzh_reserved[15]; reserved--must be zero
* char tzh_ttisutcnt[4]; coded number of trans. time flags
* char tzh_ttisstdcnt[4]; coded number of trans. time flags
* char tzh_leapcnt[4]; coded number of leap seconds
* char tzh_timecnt[4]; coded number of transition times
* char tzh_typecnt[4]; coded number of local time types
* char tzh_charcnt[4]; coded number of abbr. chars
* };
*
** TZ file body part **
*
* tzh_timecnt (char [4])s coded transition times a la time(2)
* tzh_timecnt (unsigned char)s types of local time starting at above
* tzh_typecnt repetitions of
* one (char [4]) coded UT offset in seconds
* one (unsigned char) used to set tm_isdst
* one (unsigned char) that's an abbreviation list index
* tzh_charcnt (char)s '\0'-terminated zone abbreviations
* tzh_leapcnt repetitions of
* one (char [4]) coded leap second transition times
* one (char [4]) total correction after above
* tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition time is standard time, if FALSE, transition time is wall clock time; if absent,
* transition times are assumed to be wall clock time
* tzh_ttisutcnt (char)s indexed by type; if TRUE, transition time is UT, if FALSE, transition time is local time; if absent,
* transition times are assumed to be local time.
* When this is TRUE, the corresponding std/wall indicator must also be 1.
*/
/*
* A transition from one ZoneType to another
* Minimal size = 5 bytes (4+1)
*/
typedef struct _Transition
{
gint64 time; /* seconds, 1970 epoch */
gint32 gmtoffset; /* raw seconds offset from GMT */
} Transition;
/* A collection of transitions from one zone_type to another, together
* with a list of the zone_types. A zone_info object may have a long
* list of transitions between a smaller list of zone_types.
*
* This object represents the contents of a single zic-created
* zoneinfo file.
*/
struct _ZoneInfo
{
Transition *transitions;
gint64 timecnt;
gint32 last_transitions_index;
};
struct _TimeZoneInfo
{
ZoneInfo *zone;
ZoneInfo *zone64;
glong zone_offset;
};
/* Read zic-coded 32-bit integer from file*/
static gint64
readcoded32(unsigned char **input, gint64 minv, gint64 maxv)
{
unsigned char buf[4]; /* must be UNSIGNED */
gint64 val = 0;
gint32 i = 0;
gint32 shift = 0;
memcpy (buf, *input, sizeof(buf));
*input += 4;
for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
val |= (gint64)(buf[i]) << shift;
if (val < minv || val > maxv)
{
msg_error("Error while processing the time zone file",
evt_tag_str("message", "Coded value out-of-range"),
evt_tag_int("value", val),
evt_tag_printf("expected", "[%"G_GINT64_FORMAT", %"G_GINT64_FORMAT"]", minv, maxv));
g_assert_not_reached();
}
return val;
}
/* Read zic-coded 64-bit integer from file */
static gint64
readcoded64(unsigned char **input, gint64 minv, gint64 maxv)
{
unsigned char buf[8]; /* must be UNSIGNED */
gint64 val = 0;
gint32 i = 0;
gint32 shift = 0;
memcpy (buf, *input, sizeof(buf));
*input += 8;
for (i = 0, shift = 56; i < 8; ++i, shift -= 8)
val |= (gint64)buf[i] << shift;
if (val < minv || val > maxv)
{
msg_error("Error while processing the time zone file",
evt_tag_str("message", "Coded value out-of-range"),
evt_tag_int("value", val),
evt_tag_printf("expected", "[%"G_GINT64_FORMAT", %"G_GINT64_FORMAT"]", minv, maxv));
g_assert_not_reached();
}
return val;
}
/* Read a booleanean value */
static gboolean
readbool(unsigned char **input)
{
gchar c;
c = **input;
*input += 1;
if (c!=0 && c!=1)
{
msg_error("Error while processing the time zone file",
evt_tag_str("message", "Boolean value out-of-range"),
evt_tag_int("value", c));
g_assert_not_reached();
}
return (c != 0);
}
/* Read a character value */
static gchar
readchar(unsigned char **input)
{
unsigned char c;
c = **input;
*input += 1;
return c;
}
static ZoneInfo *
zone_info_new(gint64 timecnt)
{
ZoneInfo *self = g_new0(ZoneInfo, 1);
self->transitions = g_new0(Transition, timecnt);
self->timecnt = timecnt;
self->last_transitions_index = -1;
return self;
}
static void
zone_info_free(ZoneInfo *self)
{
if (!self)
return;
g_free(self->transitions);
g_free(self);
}
/**
* Parse the zoneinfo file structure (see tzfile.h) into a ZoneInfo
*/
static ZoneInfo *
zone_info_parser(unsigned char **input, gboolean is64bitData, gint *version)
{
gint32 i = 0;
unsigned char *buf = NULL;
ZoneInfo *info = NULL;
gint64 *transition_times = NULL;
guint8 *transition_types = NULL;
gint32 *gmt_offsets = NULL;
gint64 isutcnt, isstdcnt, leapcnt, timecnt, typecnt, charcnt;
gboolean insertInitial = FALSE;
buf = *input;
*input += 4;
if (strncmp((gchar *)buf, TZ_MAGIC, 4) != 0)
{
msg_error("Error while processing the time zone file",
evt_tag_str("message", TZ_MAGIC" signature is missing"));
goto error;
}
/* read the version byte */
buf = *input;
*input += 1;
/*
* if '\0', we have just one copy of data,
* if '2', there is additional 64 bit version at the end.
*/
if (buf[0] != 0 && buf[0] != '2' && buf[0] != '3')
{
msg_error("Error in the time zone file",
evt_tag_str("message", "Bad Olson version info"));
goto error;
}
else
{
if (buf[0] != 0)
*version = buf[0] - '0';
else
*version = 0;
}
/* Read reserved bytes */
*input += 15;
/* Read array sizes */
isutcnt = readcoded32(input, 0, G_MAXINT64);
isstdcnt = readcoded32(input, 0, G_MAXINT64);
leapcnt = readcoded32(input, 0, G_MAXINT64);
timecnt = readcoded32(input, 0, G_MAXINT64);
typecnt = readcoded32(input, 0, G_MAXINT64);
charcnt = readcoded32(input, 0, G_MAXINT64);
/*
* Used temporarily to store transition times and types. We need
* to do this because the times and types are stored in two
* separate arrays.
*/
transition_times = g_new0(gint64, timecnt);
transition_types = g_new0(guint8, timecnt);
gmt_offsets = g_new0(gint32, typecnt);
/* Read transition times */
for (i = 0; i < timecnt; ++i)
{
if (is64bitData)
{
transition_times[i] = readcoded64(input, G_MININT64, G_MAXINT64);
}
else
{
transition_times[i] = readcoded32(input, G_MININT64, G_MAXINT64);
}
}
/* Read transition types */
for (i = 0; i < timecnt; ++i)
{
guint8 t = (guint8)readchar(input);
if (t >= typecnt)
{
msg_warning("Error in the time zone file",
evt_tag_str("message", "Illegal type number"),
evt_tag_printf("val", "%ld", (long) t),
evt_tag_printf("expected", "[0, %" G_GINT64_FORMAT "]", typecnt-1));
goto error;
}
transition_types[i] = t;
}
/* Read types (except for the isstd and isut flags, which come later (why??)) */
for (i = 0; i<typecnt; ++i)
{
gint offs = 24;
if (*version == 3)
offs = 167;
gmt_offsets[i] = readcoded32(input, G_MININT64, G_MAXINT64);
if (gmt_offsets[i] > offs * 60 * 60 || gmt_offsets[i] < -1 * offs * 60 * 60)
{
msg_warning("Error in the time zone file",
evt_tag_str("message", "Illegal gmtoffset number"),
evt_tag_int("val", gmt_offsets[i]),
evt_tag_printf("expected", "[%d, %d]", -1 * offs * 60 * 60, offs * 60 * 60));
goto error;
}
/* ignore isdst flag */
readbool(input);
/* ignore abbr index */
readchar(input);
}
/* allocate a new ZoneInfo structure */
if (typecnt > 0 && timecnt == 0)
{
/* only one type info is in the time zone file so add it with 1901 */
info = zone_info_new(1);
info->transitions[0].time = LOWEST_TIME32;
info->transitions[0].gmtoffset = gmt_offsets[0];
}
else
{
info = zone_info_new(timecnt);
}
/* Build transitions vector out of corresponding times and types. */
insertInitial = FALSE;
if (is64bitData)
{
if (timecnt > 0)
{
gint32 minidx = -1;
gint32 last_transition_index = 0;
for (i = 0; i < timecnt; ++i)
{
if (transition_times[i] < LOWEST_TIME32)
{
if (minidx == -1 || transition_times[i] > transition_times[minidx])
{
/* Preserve the latest transition before the 32bit minimum time */
minidx = i;
}
}
else
{
info->transitions[last_transition_index].time = transition_times[i];
info->transitions[last_transition_index].gmtoffset = gmt_offsets[transition_types[i]];
last_transition_index++;
}
}
if (minidx != -1)
{
/*
* If there are any transitions before the 32bit minimum time,
* put the type information with the 32bit minimum time
*/
memmove(&info->transitions[1], &info->transitions[0], sizeof(Transition) * (timecnt-1));
info->transitions[0].time = LOWEST_TIME32;
info->transitions[0].gmtoffset = gmt_offsets[transition_types[minidx]];
info->timecnt -= minidx;
}
else
{
/* Otherwise, we need insert the initial type later */
insertInitial = TRUE;
}
}
}
else
{
for (i = 0; i < timecnt; ++i)
{
info->transitions[i].time = transition_times[i];
info->transitions[i].gmtoffset = gmt_offsets[transition_types[i]];
}
}
if (insertInitial)
{
g_assert(timecnt > 0);
g_assert(typecnt > 0);
/* reallocate the transitions vector to be able to store a new entry */
info->timecnt ++;
timecnt ++;
info->transitions = g_renew(Transition, info->transitions, timecnt);
/* Add the initial type associated with the lowest int32 time */
memmove(&info->transitions[1], &info->transitions[0], sizeof(Transition) * (timecnt-1));
info->transitions[0].time = LOWEST_TIME32;
info->transitions[0].gmtoffset = gmt_offsets[0];
}
/* ignore the abbreviation string */
if (charcnt)
*input += charcnt;
/* ignore leap second info, if any */
for (i=0; i<leapcnt; ++i)
{
if(is64bitData)
readcoded64(input, G_MININT64, G_MAXINT64);/* leap second transition time */
else
readcoded32(input, G_MININT64, G_MAXINT64);/* leap second transition time */
readcoded32(input, G_MININT64, G_MAXINT64);/* total correction after above */
}
/* http://osdir.com/ml/time.tz/2006-02/msg00041.html */
/* We dont nead this flags to compute the wall time of the timezone*/
/* Ignore isstd flags */
for (i=0; i<isstdcnt; i++)
readbool(input);
/* Ignore isut flags */
for (i=0; i<isutcnt; i++)
readbool(input);
error:
g_free(transition_times);
g_free(transition_types);
g_free(gmt_offsets);
*version = 0;
return info;
}
static gint64
zone_info_get_offset(ZoneInfo *self, gint64 timestamp)
{
gint32 i = 0;
if (self->transitions == NULL)
return 0;
if (self->last_transitions_index != -1 &&
self->last_transitions_index < (self->timecnt - 1) &&
self->transitions[self->last_transitions_index].time <= timestamp &&
self->transitions[self->last_transitions_index + 1].time > timestamp)
{
return self->transitions[ self->last_transitions_index ].gmtoffset;
}
else
{
for (i = 0; i < (self->timecnt - 1); i++)
if (self->transitions[i].time <= timestamp &&
self->transitions[i+1].time > timestamp)
break;
self->last_transitions_index = i;
}
return self->transitions[self->last_transitions_index].gmtoffset;
}
static gboolean
zone_info_read(const gchar *zonename, ZoneInfo **zone, ZoneInfo **zone64)
{
unsigned char *buff = NULL;
gchar *filename = NULL;
int byte_read = 0;
int version;
GError *error = NULL;
GMappedFile *file_map = NULL;
*zone = NULL;
*zone64 = NULL;
filename = g_build_path(G_DIR_SEPARATOR_S, get_time_zone_basedir(), zonename, NULL);
file_map = g_mapped_file_new(filename, FALSE, &error);
if (!file_map)
{
msg_error("Failed to open the time zone file", evt_tag_str("filename", filename), evt_tag_str("message",
error->message));
g_error_free(error);
g_free(filename);
return FALSE;
}
byte_read = g_mapped_file_get_length(file_map);
buff = (unsigned char *)g_mapped_file_get_contents(file_map);
if (byte_read == -1)
{
msg_error("Failed to read the time zone file", evt_tag_str("filename", filename));
g_mapped_file_unref(file_map);
g_free(filename);
return FALSE;
}
msg_debug("Processing the time zone file (32bit part)", evt_tag_str("filename", filename));
*zone = zone_info_parser(&buff, FALSE, &version);
if (version == 2)
{
msg_debug("Processing the time zone file (64bit part)", evt_tag_str("filename", filename));
*zone64 = zone_info_parser(&buff, TRUE, &version);
}
g_mapped_file_unref(file_map);
g_free(filename);
return *zone != NULL || *zone64 != NULL;
}
gint32
time_zone_info_get_offset(const TimeZoneInfo *self, time_t stamp)
{
if (self == NULL)
return -1;
if (self->zone_offset != -1)
return self->zone_offset;
if (self->zone64)
return zone_info_get_offset(self->zone64, stamp);
if (self->zone)
return zone_info_get_offset(self->zone, stamp);
return -1;
}
TimeZoneInfo *
time_zone_info_new(const gchar *tz)
{
TimeZoneInfo *self = g_new0(TimeZoneInfo, 1);
self->zone_offset = -1;
/* if no time zone was specified return with an empty TimeZoneInfo pointer */
if (!tz)
return self;
if ((*tz == '+' || *tz == '-') && strlen(tz) == 6 &&
isdigit((int) *(tz+1)) && isdigit((int) *(tz+2)) &&
(*(tz+3) == ':') && isdigit((int) *(tz+4)) &&
isdigit((int) *(tz+5)))
{
/* timezone offset */
gint sign = *tz == '-' ? -1 : 1;
gint hours, mins;
tz++;
hours = (*tz - '0') * 10 + *(tz+1) - '0';
mins = (*(tz+3) - '0') * 10 + *(tz+4) - '0';
if ((hours < 24 && mins <= 60) || (hours == 24 && mins == 0))
{
self->zone_offset = sign * (hours * 3600 + mins * 60);
return self;
}
}
else if (zone_info_read(tz, &self->zone, &self->zone64))
{
return self;
}
time_zone_info_free(self);
/* failed to read time zone data */
msg_error("Bogus timezone spec, must be in the format [+-]HH:MM, offset must be less than 24:00",
evt_tag_str("value", tz));
return NULL;
}
void
time_zone_info_free(TimeZoneInfo *self)
{
g_assert(self);
zone_info_free(self->zone);
zone_info_free(self->zone64);
g_free(self);
}
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