207 lines
5.5 KiB
C
207 lines
5.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "fd-util.h"
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#include "fs-util.h"
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#include "hexdecoct.h"
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#include "id128-util.h"
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#include "io-util.h"
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#include "stdio-util.h"
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char *id128_to_uuid_string(sd_id128_t id, char s[static ID128_UUID_STRING_MAX]) {
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unsigned n, k = 0;
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assert(s);
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/* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */
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for (n = 0; n < 16; n++) {
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if (IN_SET(n, 4, 6, 8, 10))
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s[k++] = '-';
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s[k++] = hexchar(id.bytes[n] >> 4);
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s[k++] = hexchar(id.bytes[n] & 0xF);
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}
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assert(k == 36);
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s[k] = 0;
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return s;
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}
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bool id128_is_valid(const char *s) {
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size_t i, l;
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assert(s);
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l = strlen(s);
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if (l == 32) {
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/* Plain formatted 128bit hex string */
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for (i = 0; i < l; i++) {
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char c = s[i];
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if (!(c >= '0' && c <= '9') &&
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!(c >= 'a' && c <= 'z') &&
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!(c >= 'A' && c <= 'Z'))
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return false;
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}
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} else if (l == 36) {
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/* Formatted UUID */
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for (i = 0; i < l; i++) {
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char c = s[i];
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if (IN_SET(i, 8, 13, 18, 23)) {
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if (c != '-')
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return false;
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} else {
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if (!(c >= '0' && c <= '9') &&
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!(c >= 'a' && c <= 'z') &&
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!(c >= 'A' && c <= 'Z'))
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return false;
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}
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}
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} else
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return false;
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return true;
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}
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int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
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char buffer[36 + 2];
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ssize_t l;
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assert(fd >= 0);
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assert(f < _ID128_FORMAT_MAX);
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/* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both
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* optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they
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* aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you
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* accept". */
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l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */
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if (l < 0)
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return (int) l;
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if (l == 0) /* empty? */
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return -ENOMEDIUM;
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switch (l) {
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case 33: /* plain UUID with trailing newline */
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if (buffer[32] != '\n')
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return -EINVAL;
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_fallthrough_;
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case 32: /* plain UUID without trailing newline */
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if (f == ID128_UUID)
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return -EINVAL;
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buffer[32] = 0;
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break;
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case 37: /* RFC UUID with trailing newline */
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if (buffer[36] != '\n')
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return -EINVAL;
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_fallthrough_;
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case 36: /* RFC UUID without trailing newline */
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if (f == ID128_PLAIN)
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return -EINVAL;
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buffer[36] = 0;
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break;
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default:
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return -EINVAL;
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}
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return sd_id128_from_string(buffer, ret);
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}
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int id128_read(const char *p, Id128Format f, sd_id128_t *ret) {
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_cleanup_close_ int fd = -1;
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fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
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if (fd < 0)
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return -errno;
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return id128_read_fd(fd, f, ret);
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}
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int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) {
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char buffer[36 + 2];
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size_t sz;
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int r;
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assert(fd >= 0);
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assert(f < _ID128_FORMAT_MAX);
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if (f != ID128_UUID) {
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sd_id128_to_string(id, buffer);
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buffer[32] = '\n';
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sz = 33;
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} else {
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id128_to_uuid_string(id, buffer);
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buffer[36] = '\n';
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sz = 37;
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}
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r = loop_write(fd, buffer, sz, false);
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if (r < 0)
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return r;
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if (do_sync) {
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if (fsync(fd) < 0)
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return -errno;
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r = fsync_directory_of_file(fd);
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if (r < 0)
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return r;
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}
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return 0;
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}
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int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) {
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_cleanup_close_ int fd = -1;
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fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444);
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if (fd < 0)
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return -errno;
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return id128_write_fd(fd, f, id, do_sync);
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}
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void id128_hash_func(const sd_id128_t *p, struct siphash *state) {
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siphash24_compress(p, sizeof(sd_id128_t), state);
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}
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int id128_compare_func(const sd_id128_t *a, const sd_id128_t *b) {
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return memcmp(a, b, 16);
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}
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sd_id128_t id128_make_v4_uuid(sd_id128_t id) {
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/* Stolen from generate_random_uuid() of drivers/char/random.c
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* in the kernel sources */
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/* Set UUID version to 4 --- truly random generation */
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id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40;
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/* Set the UUID variant to DCE */
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id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80;
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return id;
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}
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DEFINE_HASH_OPS(id128_hash_ops, sd_id128_t, id128_hash_func, id128_compare_func);
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