1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/*
* Copyright (C) 2020 - Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <fcntl.h>
#include <liburing.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <iou.h>
#include <thunk.h>
#include "machid.h"
#include "readfile.h"
/* Implements iou-based machine-id retrieval.
*
* this is basically copy & paste from bootid.c,
* which suggests this should just be readfile.c
*/
#define MACHID_PATH "/etc/machine-id"
/* call user-supplied closure now that buf is populated */
THUNK_DEFINE_STATIC(have_machid, iou_t *, iou, char *, buf, size_t *, size, char **, res_ptr, thunk_t *, closure)
{
assert(iou);
assert(closure);
/* FIXME: I'm just assuming it's a proper nl-terminated machid for now, null terminate it */
buf[*size - 1] = '\0';
*res_ptr = strdup(buf);
if (!*res_ptr)
return -ENOMEM;
return thunk_end(thunk_dispatch(closure));
}
/* get a machid via iou, scheduling closure once gotten */
/* returns < 0 on error, 0 on successful queueing of operation */
THUNK_DEFINE(machid_get, iou_t *, iou, char **, res_ptr, thunk_t *, closure)
{
thunk_t *machid_thunk;
struct {
char buf[4096];
size_t len;
} *buf;
machid_thunk = THUNK_ALLOC(have_machid, (void **)&buf, sizeof(*buf));
buf->len = sizeof(buf->buf);
THUNK_INIT(have_machid(machid_thunk, iou, buf->buf, &buf->len, res_ptr, closure));
return readfile(iou, MACHID_PATH, buf->buf, &buf->len, machid_thunk);
}
|
