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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <fcntl.h>
#include "alloc-util.h"
#include "env-util.h"
#include "escape.h"
#include "fileio.h"
#include "missing_mman.h"
#include "missing_syscall.h"
#include "parse-util.h"
#include "process-util.h"
#include "serialize.h"
#include "strv.h"
#include "tmpfile-util.h"
int serialize_item(FILE *f, const char *key, const char *value) {
assert(f);
assert(key);
if (!value)
return 0;
/* Make sure that anything we serialize we can also read back again with read_line() with a maximum line size
* of LONG_LINE_MAX. This is a safety net only. All code calling us should filter this out earlier anyway. */
if (strlen(key) + 1 + strlen(value) + 1 > LONG_LINE_MAX) {
log_warning("Attempted to serialize overly long item '%s', refusing.", key);
return -EINVAL;
}
fputs(key, f);
fputc('=', f);
fputs(value, f);
fputc('\n', f);
return 1;
}
int serialize_item_escaped(FILE *f, const char *key, const char *value) {
_cleanup_free_ char *c = NULL;
assert(f);
assert(key);
if (!value)
return 0;
c = cescape(value);
if (!c)
return log_oom();
return serialize_item(f, key, c);
}
int serialize_item_format(FILE *f, const char *key, const char *format, ...) {
char buf[LONG_LINE_MAX];
va_list ap;
int k;
assert(f);
assert(key);
assert(format);
va_start(ap, format);
k = vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
if (k < 0 || (size_t) k >= sizeof(buf) || strlen(key) + 1 + k + 1 > LONG_LINE_MAX) {
log_warning("Attempted to serialize overly long item '%s', refusing.", key);
return -EINVAL;
}
fputs(key, f);
fputc('=', f);
fputs(buf, f);
fputc('\n', f);
return 1;
}
int serialize_fd(FILE *f, FDSet *fds, const char *key, int fd) {
int copy;
assert(f);
assert(key);
if (fd < 0)
return 0;
copy = fdset_put_dup(fds, fd);
if (copy < 0)
return log_error_errno(copy, "Failed to add file descriptor to serialization set: %m");
return serialize_item_format(f, key, "%i", copy);
}
int serialize_usec(FILE *f, const char *key, usec_t usec) {
assert(f);
assert(key);
if (usec == USEC_INFINITY)
return 0;
return serialize_item_format(f, key, USEC_FMT, usec);
}
int serialize_dual_timestamp(FILE *f, const char *name, const dual_timestamp *t) {
assert(f);
assert(name);
assert(t);
if (!dual_timestamp_is_set(t))
return 0;
return serialize_item_format(f, name, USEC_FMT " " USEC_FMT, t->realtime, t->monotonic);
}
int serialize_strv(FILE *f, const char *key, char **l) {
int ret = 0, r;
char **i;
/* Returns the first error, or positive if anything was serialized, 0 otherwise. */
STRV_FOREACH(i, l) {
r = serialize_item_escaped(f, key, *i);
if ((ret >= 0 && r < 0) ||
(ret == 0 && r > 0))
ret = r;
}
return ret;
}
int deserialize_usec(const char *value, usec_t *ret) {
int r;
assert(value);
r = safe_atou64(value, ret);
if (r < 0)
return log_debug_errno(r, "Failed to parse usec value \"%s\": %m", value);
return 0;
}
int deserialize_dual_timestamp(const char *value, dual_timestamp *t) {
uint64_t a, b;
int r, pos;
assert(value);
assert(t);
pos = strspn(value, WHITESPACE);
if (value[pos] == '-')
return -EINVAL;
pos += strspn(value + pos, DIGITS);
pos += strspn(value + pos, WHITESPACE);
if (value[pos] == '-')
return -EINVAL;
r = sscanf(value, "%" PRIu64 "%" PRIu64 "%n", &a, &b, &pos);
if (r != 2)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to parse dual timestamp value \"%s\".",
value);
if (value[pos] != '\0')
/* trailing garbage */
return -EINVAL;
t->realtime = a;
t->monotonic = b;
return 0;
}
int deserialize_environment(const char *value, char ***list) {
_cleanup_free_ char *unescaped = NULL;
int r;
assert(value);
assert(list);
/* Changes the *environment strv inline. */
r = cunescape(value, 0, &unescaped);
if (r < 0)
return log_error_errno(r, "Failed to unescape: %m");
r = strv_env_replace(list, unescaped);
if (r < 0)
return log_error_errno(r, "Failed to append environment variable: %m");
unescaped = NULL; /* now part of 'list' */
return 0;
}
int open_serialization_fd(const char *ident) {
int fd;
fd = memfd_create(ident, MFD_CLOEXEC);
if (fd < 0) {
const char *path;
path = getpid_cached() == 1 ? "/run/systemd" : "/tmp";
fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC);
if (fd < 0)
return fd;
log_debug("Serializing %s to %s.", ident, path);
} else
log_debug("Serializing %s to memfd.", ident);
return fd;
}
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