/* Return the mmap()ed tzfile if found, else NULL. On success, the
* length of the mapped data is placed in *length. */
static char *map_tzfile(const char *timezone, size_t *length)
{
char fname[PATH_MAX];
struct stat st;
char *p;
int fd;
if (timezone[0] == '\0' || strstr(timezone, "..") != NULL) {
return NULL;
}
if (system_location_table) {
const struct location_info *li;
if ((li = find_zone_info(system_location_table, timezone)) != NULL) {
/* Use the stored name to avoid case issue */
timezone = li->name;
}
}
snprintf(fname, sizeof fname, ZONEINFO_PREFIX "/%s", timezone);
fd = open(fname, O_RDONLY);
if (fd == -1) {
return NULL;
} else if (fstat(fd, &st) != 0 || !is_valid_tzfile(&st)) {
close(fd);
return NULL;
}
*length = st.st_size;
p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
close(fd);
return p != MAP_FAILED ? p : NULL;
}
int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
{
const unsigned char *tzf;
#ifdef HAVE_SYSTEM_TZDATA
if (tzdb == timezonedb_system) {
char fname[PATH_MAX];
struct stat st;
if (timezone[0] == '\0' || strstr(timezone, "..") != NULL) {
return 0;
}
if (system_location_table) {
if (find_zone_info(system_location_table, timezone) != NULL) {
/* found in cache */
return 1;
}
}
snprintf(fname, sizeof fname, ZONEINFO_PREFIX "/%s", timezone);
return stat(fname, &st) == 0 && is_valid_tzfile(&st);
}
#endif
return (inmem_seek_to_tz_position(&tzf, timezone, tzdb));
}
/* Return the mmap()ed tzfile if found, else NULL. On success, the
* length of the mapped data is placed in *length. */
static char *map_tzfile(const char *timezone, size_t *length)
{
char fname[PATH_MAX];
struct stat st;
char *p;
int fd;
if (timezone[0] == '\0' || strstr(timezone, "..") != NULL) {
return NULL;
}
snprintf(fname, sizeof fname, ZONEINFO_PREFIX "/%s", timezone);
fd = open(fname, O_RDONLY);
if (fd == -1) {
return NULL;
} else if (fstat(fd, &st) != 0 || !is_valid_tzfile(&st)) {
close(fd);
return NULL;
}
*length = st.st_size;
p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
close(fd);
return p != MAP_FAILED ? p : NULL;
}
