15263807472

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <string.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>

#include "alloc-util.h"
#include "chase.h"
#include "devnum-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "stdio-util.h"
#include "string-util.h"

int parse_devnum(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 (n > DECIMAL_STR_MAX(dev_t))
                return -EINVAL;
        if (s[n] != ':')
                return -EINVAL;

        major = strndupa_safe(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 device_path_make_major_minor(mode_t mode, dev_t devnum, char **ret) {
        const char *t;

        /* Generates the /dev/{char|block}/MAJOR:MINOR path for a dev_t */

        if (S_ISCHR(mode))
                t = "char";
        else if (S_ISBLK(mode))
                t = "block";
        else
                return -ENODEV;

        if (asprintf(ret, "/dev/%s/" DEVNUM_FORMAT_STR, t, DEVNUM_FORMAT_VAL(devnum)) < 0)
                return -ENOMEM;

        return 0;
}

int device_path_make_inaccessible(mode_t mode, char **ret) {
        const char *s;

        assert(ret);

        if (S_ISCHR(mode))
                s = "/run/systemd/inaccessible/chr";
        else if (S_ISBLK(mode))
                s = "/run/systemd/inaccessible/blk";
        else
                return -ENODEV;

        return strdup_to(ret, s);
}

int device_path_make_canonical(mode_t mode, dev_t devnum, char **ret) {
        _cleanup_free_ char *p = NULL;
        int r;

        /* Finds the canonical path for a device, i.e. resolves the /dev/{char|block}/MAJOR:MINOR path to the end. */

        assert(ret);

        if (devnum_is_zero(devnum))
                /* A special hack to make sure our 'inaccessible' device nodes work. They won't have symlinks in
                 * /dev/block/ and /dev/char/, hence we handle them specially here. */
                return device_path_make_inaccessible(mode, ret);

        r = device_path_make_major_minor(mode, devnum, &p);
        if (r < 0)
                return r;

        return chase(p, NULL, 0, ret, NULL);
}

int device_path_parse_major_minor(const char *path, mode_t *ret_mode, dev_t *ret_devnum) {
        mode_t mode;
        dev_t devnum;
        int r;

        /* Tries to extract the major/minor directly from the device path if we can. Handles /dev/block/ and /dev/char/
         * paths, as well out synthetic inaccessible device nodes. Never goes to disk. Returns -ENODEV if the device
         * path cannot be parsed like this.  */

        if (path_equal(path, "/run/systemd/inaccessible/chr")) {
                mode = S_IFCHR;
                devnum = makedev(0, 0);
        } else if (path_equal(path, "/run/systemd/inaccessible/blk")) {
                mode = S_IFBLK;
                devnum = makedev(0, 0);
        } else {
                const char *w;

                w = path_startswith(path, "/dev/block/");
                if (w)
                        mode = S_IFBLK;
                else {
                        w = path_startswith(path, "/dev/char/");
                        if (!w)
                                return -ENODEV;

                        mode = S_IFCHR;
                }

                r = parse_devnum(w, &devnum);
                if (r < 0)
                        return r;
        }

        if (ret_mode)
                *ret_mode = mode;
        if (ret_devnum)
                *ret_devnum = devnum;

        return 0;
}

char* format_devnum(dev_t d, char buf[static DEVNUM_STR_MAX]) {
        return ASSERT_PTR(snprintf_ok(buf, DEVNUM_STR_MAX, DEVNUM_FORMAT_STR, DEVNUM_FORMAT_VAL(d)));
}

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <string.h>
4	#include <sys/stat.h>
5	#include <sys/sysmacros.h>
6
7	#include "alloc-util.h"
8	#include "chase.h"
9	#include "devnum-util.h"
10	#include "parse-util.h"
11	#include "path-util.h"
12	#include "stdio-util.h"
13	#include "string-util.h"
14
15	int parse_devnum(const char s, dev_t ret) {	11,730✔
16	const char *major;	11,730✔
17	unsigned x, y;	11,730✔
18	size_t n;	11,730✔
19	int r;	11,730✔
20
21	n = strspn(s, DIGITS);	11,730✔
22	if (n == 0)	11,730✔
23	return -EINVAL;	11,730✔
24	if (n > DECIMAL_STR_MAX(dev_t))	11,726✔
25	return -EINVAL;
26	if (s[n] != ':')	11,726✔
27	return -EINVAL;
28
29	major = strndupa_safe(s, n);	11,724✔
30	r = safe_atou(major, &x);	11,724✔
31	if (r < 0)	11,724✔
32	return r;
33
34	r = safe_atou(s + n + 1, &y);	11,724✔
35	if (r < 0)	11,724✔
36	return r;
37
38	if (!DEVICE_MAJOR_VALID(x) \|\| !DEVICE_MINOR_VALID(y))	11,723✔
39	return -ERANGE;
40
41	*ret = makedev(x, y);	11,723✔
42	return 0;	11,723✔
43	}
44
45	int device_path_make_major_minor(mode_t mode, dev_t devnum, char **ret) {	53,798✔
46	const char *t;	53,798✔
47
48	/* Generates the /dev/{char\|block}/MAJOR:MINOR path for a dev_t */
49
50	if (S_ISCHR(mode))	53,798✔
51	t = "char";
52	else if (S_ISBLK(mode))	40,703✔
53	t = "block";
54	else
55	return -ENODEV;
56
57	if (asprintf(ret, "/dev/%s/" DEVNUM_FORMAT_STR, t, DEVNUM_FORMAT_VAL(devnum)) < 0)	53,798✔
UNCOV 58	return -ENOMEM;	×
59
60	return 0;
61	}
62
63	int device_path_make_inaccessible(mode_t mode, char **ret) {	6✔
64	const char *s;	6✔
65
66	assert(ret);	6✔
67
68	if (S_ISCHR(mode))	6✔
69	s = "/run/systemd/inaccessible/chr";
70	else if (S_ISBLK(mode))	3✔
71	s = "/run/systemd/inaccessible/blk";
72	else
73	return -ENODEV;
74
75	return strdup_to(ret, s);	6✔
76	}
77
78	int device_path_make_canonical(mode_t mode, dev_t devnum, char **ret) {	15✔
79	_cleanup_free_ char *p = NULL;	15✔
80	int r;	15✔
81
82	/* Finds the canonical path for a device, i.e. resolves the /dev/{char\|block}/MAJOR:MINOR path to the end. */
83
84	assert(ret);	15✔
85
86	if (devnum_is_zero(devnum))	15✔
87	/* A special hack to make sure our 'inaccessible' device nodes work. They won't have symlinks in
88	* /dev/block/ and /dev/char/, hence we handle them specially here. */
89	return device_path_make_inaccessible(mode, ret);	2✔
90
91	r = device_path_make_major_minor(mode, devnum, &p);	13✔
92	if (r < 0)	13✔
93	return r;
94
95	return chase(p, NULL, 0, ret, NULL);	13✔
96	}
97
98	int device_path_parse_major_minor(const char path, mode_t ret_mode, dev_t *ret_devnum) {	311,148✔
99	mode_t mode;	311,148✔
100	dev_t devnum;	311,148✔
101	int r;	311,148✔
102
103	/* Tries to extract the major/minor directly from the device path if we can. Handles /dev/block/ and /dev/char/
104	* paths, as well out synthetic inaccessible device nodes. Never goes to disk. Returns -ENODEV if the device
105	* path cannot be parsed like this. */
106
107	if (path_equal(path, "/run/systemd/inaccessible/chr")) {	311,148✔
108	mode = S_IFCHR;	155✔
109	devnum = makedev(0, 0);	155✔
110	} else if (path_equal(path, "/run/systemd/inaccessible/blk")) {	310,993✔
111	mode = S_IFBLK;	155✔
112	devnum = makedev(0, 0);	155✔
113	} else {
114	const char *w;	310,838✔
115
116	w = path_startswith(path, "/dev/block/");	310,838✔
117	if (w)	310,838✔
118	mode = S_IFBLK;
119	else {
120	w = path_startswith(path, "/dev/char/");	310,823✔
121	if (!w)	310,823✔
122	return -ENODEV;	311,148✔
123
124	mode = S_IFCHR;
125	}
126
127	r = parse_devnum(w, &devnum);	368✔
128	if (r < 0)	368✔
129	return r;
130	}
131
132	if (ret_mode)	678✔
133	*ret_mode = mode;	678✔
134	if (ret_devnum)	678✔
135	*ret_devnum = devnum;	678✔
136
137	return 0;
138	}
139
140	char* format_devnum(dev_t d, char buf[static DEVNUM_STR_MAX]) {	4,423✔
141	return ASSERT_PTR(snprintf_ok(buf, DEVNUM_STR_MAX, DEVNUM_FORMAT_STR, DEVNUM_FORMAT_VAL(d)));	4,423✔
142	}

systemd / systemd / 15263807472

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