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/***
This file is part of systemd.
Copyright 2016 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <fcntl.h>
#include <unistd.h>
#include "fd-util.h"
#include "hexdecoct.h"
#include "id128-util.h"
#include "io-util.h"
#include "stdio-util.h"
char *id128_to_uuid_string(sd_id128_t id, char s[37]) {
unsigned n, k = 0;
assert(s);
/* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */
for (n = 0; n < 16; n++) {
if (IN_SET(n, 4, 6, 8, 10))
s[k++] = '-';
s[k++] = hexchar(id.bytes[n] >> 4);
s[k++] = hexchar(id.bytes[n] & 0xF);
}
assert(k == 36);
s[k] = 0;
return s;
}
bool id128_is_valid(const char *s) {
size_t i, l;
assert(s);
l = strlen(s);
if (l == 32) {
/* Plain formatted 128bit hex string */
for (i = 0; i < l; i++) {
char c = s[i];
if (!(c >= '0' && c <= '9') &&
!(c >= 'a' && c <= 'z') &&
!(c >= 'A' && c <= 'Z'))
return false;
}
} else if (l == 36) {
/* Formatted UUID */
for (i = 0; i < l; i++) {
char c = s[i];
if (IN_SET(i, 8, 13, 18, 23)) {
if (c != '-')
return false;
} else {
if (!(c >= '0' && c <= '9') &&
!(c >= 'a' && c <= 'z') &&
!(c >= 'A' && c <= 'Z'))
return false;
}
}
} else
return false;
return true;
}
int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
char buffer[36 + 2];
ssize_t l;
assert(fd >= 0);
assert(f < _ID128_FORMAT_MAX);
/* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both
* optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they
* aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you
* accept". */
l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */
if (l < 0)
return (int) l;
if (l == 0) /* empty? */
return -ENOMEDIUM;
switch (l) {
case 33: /* plain UUID with trailing newline */
if (buffer[32] != '\n')
return -EINVAL;
/* fall through */
case 32: /* plain UUID without trailing newline */
if (f == ID128_UUID)
return -EINVAL;
buffer[32] = 0;
break;
case 37: /* RFC UUID with trailing newline */
if (buffer[36] != '\n')
return -EINVAL;
/* fall through */
case 36: /* RFC UUID without trailing newline */
if (f == ID128_PLAIN)
return -EINVAL;
buffer[36] = 0;
break;
default:
return -EINVAL;
}
return sd_id128_from_string(buffer, ret);
}
int id128_read(const char *p, Id128Format f, sd_id128_t *ret) {
_cleanup_close_ int fd = -1;
fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fd < 0)
return -errno;
return id128_read_fd(fd, f, ret);
}
int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) {
char buffer[36 + 2];
size_t sz;
int r;
assert(fd >= 0);
assert(f < _ID128_FORMAT_MAX);
if (f != ID128_UUID) {
sd_id128_to_string(id, buffer);
buffer[32] = '\n';
sz = 33;
} else {
id128_to_uuid_string(id, buffer);
buffer[36] = '\n';
sz = 37;
}
r = loop_write(fd, buffer, sz, false);
if (r < 0)
return r;
if (do_sync) {
if (fsync(fd) < 0)
return -errno;
}
return r;
}
int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) {
_cleanup_close_ int fd = -1;
fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444);
if (fd < 0)
return -errno;
return id128_write_fd(fd, f, id, do_sync);
}
void id128_hash_func(const void *p, struct siphash *state) {
siphash24_compress(p, 16, state);
}
int id128_compare_func(const void *a, const void *b) {
return memcmp(a, b, 16);
}
const struct hash_ops id128_hash_ops = {
.hash = id128_hash_func,
.compare = id128_compare_func,
};
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