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-rw-r--r--src/basic/parse-util.c906
1 files changed, 906 insertions, 0 deletions
diff --git a/src/basic/parse-util.c b/src/basic/parse-util.c
new file mode 100644
index 0000000..5d4dafe
--- /dev/null
+++ b/src/basic/parse-util.c
@@ -0,0 +1,906 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <inttypes.h>
+#include <linux/oom.h>
+#include <net/if.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+
+#include "alloc-util.h"
+#include "errno-list.h"
+#include "extract-word.h"
+#include "locale-util.h"
+#include "macro.h"
+#include "missing_network.h"
+#include "parse-util.h"
+#include "process-util.h"
+#if HAVE_SECCOMP
+#include "seccomp-util.h"
+#endif
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+int parse_boolean(const char *v) {
+ if (!v)
+ return -EINVAL;
+
+ if (STRCASE_IN_SET(v,
+ "1",
+ "yes",
+ "y",
+ "true",
+ "t",
+ "on"))
+ return 1;
+
+ if (STRCASE_IN_SET(v,
+ "0",
+ "no",
+ "n",
+ "false",
+ "f",
+ "off"))
+ return 0;
+
+ return -EINVAL;
+}
+
+int parse_pid(const char *s, pid_t* ret_pid) {
+ unsigned long ul = 0;
+ pid_t pid;
+ int r;
+
+ assert(s);
+ assert(ret_pid);
+
+ r = safe_atolu(s, &ul);
+ if (r < 0)
+ return r;
+
+ pid = (pid_t) ul;
+
+ if ((unsigned long) pid != ul)
+ return -ERANGE;
+
+ if (!pid_is_valid(pid))
+ return -ERANGE;
+
+ *ret_pid = pid;
+ return 0;
+}
+
+int parse_mode(const char *s, mode_t *ret) {
+ unsigned m;
+ int r;
+
+ assert(s);
+
+ r = safe_atou_full(s, 8 |
+ SAFE_ATO_REFUSE_PLUS_MINUS, /* Leading '+' or even '-' char? that's just weird,
+ * refuse. User might have wanted to add mode flags or
+ * so, but this parser doesn't allow that, so let's
+ * better be safe. */
+ &m);
+ if (r < 0)
+ return r;
+ if (m > 07777)
+ return -ERANGE;
+
+ if (ret)
+ *ret = m;
+ return 0;
+}
+
+int parse_ifindex(const char *s) {
+ int ifi, r;
+
+ assert(s);
+
+ r = safe_atoi(s, &ifi);
+ if (r < 0)
+ return r;
+ if (ifi <= 0)
+ return -EINVAL;
+
+ return ifi;
+}
+
+int parse_mtu(int family, const char *s, uint32_t *ret) {
+ uint64_t u;
+ size_t m;
+ int r;
+
+ r = parse_size(s, 1024, &u);
+ if (r < 0)
+ return r;
+
+ if (u > UINT32_MAX)
+ return -ERANGE;
+
+ if (family == AF_INET6)
+ m = IPV6_MIN_MTU; /* This is 1280 */
+ else
+ m = IPV4_MIN_MTU; /* For all other protocols, including 'unspecified' we assume the IPv4 minimal MTU */
+
+ if (u < m)
+ return -ERANGE;
+
+ *ret = (uint32_t) u;
+ return 0;
+}
+
+int parse_size(const char *t, uint64_t base, uint64_t *size) {
+
+ /* Soo, sometimes we want to parse IEC binary suffixes, and
+ * sometimes SI decimal suffixes. This function can parse
+ * both. Which one is the right way depends on the
+ * context. Wikipedia suggests that SI is customary for
+ * hardware metrics and network speeds, while IEC is
+ * customary for most data sizes used by software and volatile
+ * (RAM) memory. Hence be careful which one you pick!
+ *
+ * In either case we use just K, M, G as suffix, and not Ki,
+ * Mi, Gi or so (as IEC would suggest). That's because that's
+ * frickin' ugly. But this means you really need to make sure
+ * to document which base you are parsing when you use this
+ * call. */
+
+ struct table {
+ const char *suffix;
+ unsigned long long factor;
+ };
+
+ static const struct table iec[] = {
+ { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
+ { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
+ { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
+ { "G", 1024ULL*1024ULL*1024ULL },
+ { "M", 1024ULL*1024ULL },
+ { "K", 1024ULL },
+ { "B", 1ULL },
+ { "", 1ULL },
+ };
+
+ static const struct table si[] = {
+ { "E", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
+ { "P", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
+ { "T", 1000ULL*1000ULL*1000ULL*1000ULL },
+ { "G", 1000ULL*1000ULL*1000ULL },
+ { "M", 1000ULL*1000ULL },
+ { "K", 1000ULL },
+ { "B", 1ULL },
+ { "", 1ULL },
+ };
+
+ const struct table *table;
+ const char *p;
+ unsigned long long r = 0;
+ unsigned n_entries, start_pos = 0;
+
+ assert(t);
+ assert(IN_SET(base, 1000, 1024));
+ assert(size);
+
+ if (base == 1000) {
+ table = si;
+ n_entries = ELEMENTSOF(si);
+ } else {
+ table = iec;
+ n_entries = ELEMENTSOF(iec);
+ }
+
+ p = t;
+ do {
+ unsigned long long l, tmp;
+ double frac = 0;
+ char *e;
+ unsigned i;
+
+ p += strspn(p, WHITESPACE);
+
+ errno = 0;
+ l = strtoull(p, &e, 10);
+ if (errno > 0)
+ return -errno;
+ if (e == p)
+ return -EINVAL;
+ if (*p == '-')
+ return -ERANGE;
+
+ if (*e == '.') {
+ e++;
+
+ /* strtoull() itself would accept space/+/- */
+ if (*e >= '0' && *e <= '9') {
+ unsigned long long l2;
+ char *e2;
+
+ l2 = strtoull(e, &e2, 10);
+ if (errno > 0)
+ return -errno;
+
+ /* Ignore failure. E.g. 10.M is valid */
+ frac = l2;
+ for (; e < e2; e++)
+ frac /= 10;
+ }
+ }
+
+ e += strspn(e, WHITESPACE);
+
+ for (i = start_pos; i < n_entries; i++)
+ if (startswith(e, table[i].suffix))
+ break;
+
+ if (i >= n_entries)
+ return -EINVAL;
+
+ if (l + (frac > 0) > ULLONG_MAX / table[i].factor)
+ return -ERANGE;
+
+ tmp = l * table[i].factor + (unsigned long long) (frac * table[i].factor);
+ if (tmp > ULLONG_MAX - r)
+ return -ERANGE;
+
+ r += tmp;
+ if ((unsigned long long) (uint64_t) r != r)
+ return -ERANGE;
+
+ p = e + strlen(table[i].suffix);
+
+ start_pos = i + 1;
+
+ } while (*p);
+
+ *size = r;
+
+ return 0;
+}
+
+int parse_range(const char *t, unsigned *lower, unsigned *upper) {
+ _cleanup_free_ char *word = NULL;
+ unsigned l, u;
+ int r;
+
+ assert(lower);
+ assert(upper);
+
+ /* Extract the lower bound. */
+ r = extract_first_word(&t, &word, "-", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EINVAL;
+
+ r = safe_atou(word, &l);
+ if (r < 0)
+ return r;
+
+ /* Check for the upper bound and extract it if needed */
+ if (!t)
+ /* Single number with no dashes. */
+ u = l;
+ else if (!*t)
+ /* Trailing dash is an error. */
+ return -EINVAL;
+ else {
+ r = safe_atou(t, &u);
+ if (r < 0)
+ return r;
+ }
+
+ *lower = l;
+ *upper = u;
+ return 0;
+}
+
+int parse_errno(const char *t) {
+ int r, e;
+
+ assert(t);
+
+ r = errno_from_name(t);
+ if (r > 0)
+ return r;
+
+ r = safe_atoi(t, &e);
+ if (r < 0)
+ return r;
+
+ /* 0 is also allowed here */
+ if (!errno_is_valid(e) && e != 0)
+ return -ERANGE;
+
+ return e;
+}
+
+#if HAVE_SECCOMP
+int parse_syscall_and_errno(const char *in, char **name, int *error) {
+ _cleanup_free_ char *n = NULL;
+ char *p;
+ int e = -1;
+
+ assert(in);
+ assert(name);
+ assert(error);
+
+ /*
+ * This parse "syscall:errno" like "uname:EILSEQ", "@sync:255".
+ * If errno is omitted, then error is set to -1.
+ * Empty syscall name is not allowed.
+ * Here, we do not check that the syscall name is valid or not.
+ */
+
+ p = strchr(in, ':');
+ if (p) {
+ e = seccomp_parse_errno_or_action(p + 1);
+ if (e < 0)
+ return e;
+
+ n = strndup(in, p - in);
+ } else
+ n = strdup(in);
+
+ if (!n)
+ return -ENOMEM;
+
+ if (isempty(n))
+ return -EINVAL;
+
+ *error = e;
+ *name = TAKE_PTR(n);
+
+ return 0;
+}
+#endif
+
+static const char *mangle_base(const char *s, unsigned *base) {
+ const char *k;
+
+ assert(s);
+ assert(base);
+
+ /* Base already explicitly specified, then don't do anything. */
+ if (SAFE_ATO_MASK_FLAGS(*base) != 0)
+ return s;
+
+ /* Support Python 3 style "0b" and 0x" prefixes, because they truly make sense, much more than C's "0" prefix for octal. */
+ k = STARTSWITH_SET(s, "0b", "0B");
+ if (k) {
+ *base = 2 | (*base & SAFE_ATO_ALL_FLAGS);
+ return k;
+ }
+
+ k = STARTSWITH_SET(s, "0o", "0O");
+ if (k) {
+ *base = 8 | (*base & SAFE_ATO_ALL_FLAGS);
+ return k;
+ }
+
+ return s;
+}
+
+int safe_atou_full(const char *s, unsigned base, unsigned *ret_u) {
+ char *x = NULL;
+ unsigned long l;
+
+ assert(s);
+ assert(SAFE_ATO_MASK_FLAGS(base) <= 16);
+
+ /* strtoul() is happy to parse negative values, and silently converts them to unsigned values without
+ * generating an error. We want a clean error, hence let's look for the "-" prefix on our own, and
+ * generate an error. But let's do so only after strtoul() validated that the string is clean
+ * otherwise, so that we return EINVAL preferably over ERANGE. */
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_LEADING_WHITESPACE) &&
+ strchr(WHITESPACE, s[0]))
+ return -EINVAL;
+
+ s += strspn(s, WHITESPACE);
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_PLUS_MINUS) &&
+ IN_SET(s[0], '+', '-'))
+ return -EINVAL; /* Note that we check the "-" prefix again a second time below, but return a
+ * different error. I.e. if the SAFE_ATO_REFUSE_PLUS_MINUS flag is set we
+ * blanket refuse +/- prefixed integers, while if it is missing we'll just
+ * return ERANGE, because the string actually parses correctly, but doesn't
+ * fit in the return type. */
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_LEADING_ZERO) &&
+ s[0] == '0' && !streq(s, "0"))
+ return -EINVAL; /* This is particularly useful to avoid ambiguities between C's octal
+ * notation and assumed-to-be-decimal integers with a leading zero. */
+
+ s = mangle_base(s, &base);
+
+ errno = 0;
+ l = strtoul(s, &x, SAFE_ATO_MASK_FLAGS(base) /* Let's mask off the flags bits so that only the actual
+ * base is left */);
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+ if (l != 0 && s[0] == '-')
+ return -ERANGE;
+ if ((unsigned long) (unsigned) l != l)
+ return -ERANGE;
+
+ if (ret_u)
+ *ret_u = (unsigned) l;
+
+ return 0;
+}
+
+int safe_atoi(const char *s, int *ret_i) {
+ unsigned base = 0;
+ char *x = NULL;
+ long l;
+
+ assert(s);
+
+ s += strspn(s, WHITESPACE);
+ s = mangle_base(s, &base);
+
+ errno = 0;
+ l = strtol(s, &x, base);
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+ if ((long) (int) l != l)
+ return -ERANGE;
+
+ if (ret_i)
+ *ret_i = (int) l;
+
+ return 0;
+}
+
+int safe_atollu_full(const char *s, unsigned base, long long unsigned *ret_llu) {
+ char *x = NULL;
+ unsigned long long l;
+
+ assert(s);
+ assert(SAFE_ATO_MASK_FLAGS(base) <= 16);
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_LEADING_WHITESPACE) &&
+ strchr(WHITESPACE, s[0]))
+ return -EINVAL;
+
+ s += strspn(s, WHITESPACE);
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_PLUS_MINUS) &&
+ IN_SET(s[0], '+', '-'))
+ return -EINVAL;
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_LEADING_ZERO) &&
+ s[0] == '0' && s[1] != 0)
+ return -EINVAL;
+
+ s = mangle_base(s, &base);
+
+ errno = 0;
+ l = strtoull(s, &x, SAFE_ATO_MASK_FLAGS(base));
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+ if (l != 0 && s[0] == '-')
+ return -ERANGE;
+
+ if (ret_llu)
+ *ret_llu = l;
+
+ return 0;
+}
+
+int safe_atolli(const char *s, long long int *ret_lli) {
+ unsigned base = 0;
+ char *x = NULL;
+ long long l;
+
+ assert(s);
+
+ s += strspn(s, WHITESPACE);
+ s = mangle_base(s, &base);
+
+ errno = 0;
+ l = strtoll(s, &x, base);
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+
+ if (ret_lli)
+ *ret_lli = l;
+
+ return 0;
+}
+
+int safe_atou8(const char *s, uint8_t *ret) {
+ unsigned base = 0;
+ unsigned long l;
+ char *x = NULL;
+
+ assert(s);
+
+ s += strspn(s, WHITESPACE);
+ s = mangle_base(s, &base);
+
+ errno = 0;
+ l = strtoul(s, &x, base);
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+ if (l != 0 && s[0] == '-')
+ return -ERANGE;
+ if ((unsigned long) (uint8_t) l != l)
+ return -ERANGE;
+
+ if (ret)
+ *ret = (uint8_t) l;
+ return 0;
+}
+
+int safe_atou16_full(const char *s, unsigned base, uint16_t *ret) {
+ char *x = NULL;
+ unsigned long l;
+
+ assert(s);
+ assert(SAFE_ATO_MASK_FLAGS(base) <= 16);
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_LEADING_WHITESPACE) &&
+ strchr(WHITESPACE, s[0]))
+ return -EINVAL;
+
+ s += strspn(s, WHITESPACE);
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_PLUS_MINUS) &&
+ IN_SET(s[0], '+', '-'))
+ return -EINVAL;
+
+ if (FLAGS_SET(base, SAFE_ATO_REFUSE_LEADING_ZERO) &&
+ s[0] == '0' && s[1] != 0)
+ return -EINVAL;
+
+ s = mangle_base(s, &base);
+
+ errno = 0;
+ l = strtoul(s, &x, SAFE_ATO_MASK_FLAGS(base));
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+ if (l != 0 && s[0] == '-')
+ return -ERANGE;
+ if ((unsigned long) (uint16_t) l != l)
+ return -ERANGE;
+
+ if (ret)
+ *ret = (uint16_t) l;
+
+ return 0;
+}
+
+int safe_atoi16(const char *s, int16_t *ret) {
+ unsigned base = 0;
+ char *x = NULL;
+ long l;
+
+ assert(s);
+
+ s += strspn(s, WHITESPACE);
+ s = mangle_base(s, &base);
+
+ errno = 0;
+ l = strtol(s, &x, base);
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+ if ((long) (int16_t) l != l)
+ return -ERANGE;
+
+ if (ret)
+ *ret = (int16_t) l;
+
+ return 0;
+}
+
+int safe_atod(const char *s, double *ret_d) {
+ _cleanup_(freelocalep) locale_t loc = (locale_t) 0;
+ char *x = NULL;
+ double d = 0;
+
+ assert(s);
+
+ loc = newlocale(LC_NUMERIC_MASK, "C", (locale_t) 0);
+ if (loc == (locale_t) 0)
+ return -errno;
+
+ errno = 0;
+ d = strtod_l(s, &x, loc);
+ if (errno > 0)
+ return -errno;
+ if (!x || x == s || *x != 0)
+ return -EINVAL;
+
+ if (ret_d)
+ *ret_d = (double) d;
+
+ return 0;
+}
+
+int parse_fractional_part_u(const char **p, size_t digits, unsigned *res) {
+ size_t i;
+ unsigned val = 0;
+ const char *s;
+
+ s = *p;
+
+ /* accept any number of digits, strtoull is limited to 19 */
+ for (i=0; i < digits; i++,s++) {
+ if (*s < '0' || *s > '9') {
+ if (i == 0)
+ return -EINVAL;
+
+ /* too few digits, pad with 0 */
+ for (; i < digits; i++)
+ val *= 10;
+
+ break;
+ }
+
+ val *= 10;
+ val += *s - '0';
+ }
+
+ /* maybe round up */
+ if (*s >= '5' && *s <= '9')
+ val++;
+
+ s += strspn(s, DIGITS);
+
+ *p = s;
+ *res = val;
+
+ return 0;
+}
+
+int parse_percent_unbounded(const char *p) {
+ const char *pc, *n;
+ int r, v;
+
+ pc = endswith(p, "%");
+ if (!pc)
+ return -EINVAL;
+
+ n = strndupa(p, pc - p);
+ r = safe_atoi(n, &v);
+ if (r < 0)
+ return r;
+ if (v < 0)
+ return -ERANGE;
+
+ return v;
+}
+
+int parse_percent(const char *p) {
+ int v;
+
+ v = parse_percent_unbounded(p);
+ if (v > 100)
+ return -ERANGE;
+
+ return v;
+}
+
+int parse_permille_unbounded(const char *p) {
+ const char *pc, *pm, *dot, *n;
+ int r, q, v;
+
+ pm = endswith(p, "‰");
+ if (pm) {
+ n = strndupa(p, pm - p);
+ r = safe_atoi(n, &v);
+ if (r < 0)
+ return r;
+ if (v < 0)
+ return -ERANGE;
+ } else {
+ pc = endswith(p, "%");
+ if (!pc)
+ return -EINVAL;
+
+ dot = memchr(p, '.', pc - p);
+ if (dot) {
+ if (dot + 2 != pc)
+ return -EINVAL;
+ if (dot[1] < '0' || dot[1] > '9')
+ return -EINVAL;
+ q = dot[1] - '0';
+ n = strndupa(p, dot - p);
+ } else {
+ q = 0;
+ n = strndupa(p, pc - p);
+ }
+ r = safe_atoi(n, &v);
+ if (r < 0)
+ return r;
+ if (v < 0)
+ return -ERANGE;
+ if (v > (INT_MAX - q) / 10)
+ return -ERANGE;
+
+ v = v * 10 + q;
+ }
+
+ return v;
+}
+
+int parse_permille(const char *p) {
+ int v;
+
+ v = parse_permille_unbounded(p);
+ if (v > 1000)
+ return -ERANGE;
+
+ return v;
+}
+
+int parse_nice(const char *p, int *ret) {
+ int n, r;
+
+ r = safe_atoi(p, &n);
+ if (r < 0)
+ return r;
+
+ if (!nice_is_valid(n))
+ return -ERANGE;
+
+ *ret = n;
+ return 0;
+}
+
+int parse_ip_port(const char *s, uint16_t *ret) {
+ uint16_t l;
+ int r;
+
+ r = safe_atou16(s, &l);
+ if (r < 0)
+ return r;
+
+ if (l == 0)
+ return -EINVAL;
+
+ *ret = (uint16_t) l;
+
+ return 0;
+}
+
+int parse_ip_port_range(const char *s, uint16_t *low, uint16_t *high) {
+ unsigned l, h;
+ int r;
+
+ r = parse_range(s, &l, &h);
+ if (r < 0)
+ return r;
+
+ if (l <= 0 || l > 65535 || h <= 0 || h > 65535)
+ return -EINVAL;
+
+ if (h < l)
+ return -EINVAL;
+
+ *low = l;
+ *high = h;
+
+ return 0;
+}
+
+int parse_ip_prefix_length(const char *s, int *ret) {
+ unsigned l;
+ int r;
+
+ r = safe_atou(s, &l);
+ if (r < 0)
+ return r;
+
+ if (l > 128)
+ return -ERANGE;
+
+ *ret = (int) l;
+
+ return 0;
+}
+
+int parse_dev(const char *s, dev_t *ret) {
+ const char *major;
+ unsigned x, y;
+ size_t n;
+ int r;
+
+ n = strspn(s, DIGITS);
+ if (n == 0)
+ return -EINVAL;
+ if (s[n] != ':')
+ return -EINVAL;
+
+ major = strndupa(s, n);
+ r = safe_atou(major, &x);
+ if (r < 0)
+ return r;
+
+ r = safe_atou(s + n + 1, &y);
+ if (r < 0)
+ return r;
+
+ if (!DEVICE_MAJOR_VALID(x) || !DEVICE_MINOR_VALID(y))
+ return -ERANGE;
+
+ *ret = makedev(x, y);
+ return 0;
+}
+
+int parse_oom_score_adjust(const char *s, int *ret) {
+ int r, v;
+
+ assert(s);
+ assert(ret);
+
+ r = safe_atoi(s, &v);
+ if (r < 0)
+ return r;
+
+ if (v < OOM_SCORE_ADJ_MIN || v > OOM_SCORE_ADJ_MAX)
+ return -ERANGE;
+
+ *ret = v;
+ return 0;
+}
+
+int store_loadavg_fixed_point(unsigned long i, unsigned long f, loadavg_t *ret) {
+ assert(ret);
+
+ if (i >= (~0UL << FSHIFT))
+ return -ERANGE;
+
+ i = i << FSHIFT;
+ f = DIV_ROUND_UP((f << FSHIFT), 100);
+
+ if (f >= FIXED_1)
+ return -ERANGE;
+
+ *ret = i | f;
+ return 0;
+}
+
+int parse_loadavg_fixed_point(const char *s, loadavg_t *ret) {
+ const char *d, *f_str, *i_str;
+ unsigned long i, f;
+ int r;
+
+ assert(s);
+ assert(ret);
+
+ d = strchr(s, '.');
+ if (!d)
+ return -EINVAL;
+
+ i_str = strndupa(s, d - s);
+ f_str = d + 1;
+
+ r = safe_atolu_full(i_str, 10, &i);
+ if (r < 0)
+ return r;
+
+ r = safe_atolu_full(f_str, 10, &f);
+ if (r < 0)
+ return r;
+
+ return store_loadavg_fixed_point(i, f, ret);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-30 15:05:20 +0000