17014398938

Committed 16 Aug 2025 10:22PM UTC coverage: 72.237% (+0.06%) from 72.175%

Build # 17014398938

Build Type

push

github

Committed by

bluca

Commit Message

meson: compile nss-util.c only when at least one nss module is enabled

Follow-up for ea7075347.

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74.01

/src/shared/hostname-setup.c

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

#include <stdio.h>
#include <sys/utsname.h>
#include <unistd.h>

#include "sd-daemon.h"

#include "alloc-util.h"
#include "creds-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "hexdecoct.h"
#include "hostname-setup.h"
#include "hostname-util.h"
#include "initrd-util.h"
#include "log.h"
#include "proc-cmdline.h"
#include "siphash24.h"
#include "string-table.h"
#include "string-util.h"

static int sethostname_idempotent_full(const char *s, bool really) {
        struct utsname u;

        assert(s);

        if (uname(&u) < 0)
                return -errno;

        if (streq_ptr(s, u.nodename))
                return 0;

        if (really &&
            sethostname(s, strlen(s)) < 0)
                return -errno;

        return 1;
}

int sethostname_idempotent(const char *s) {
        return sethostname_idempotent_full(s, true);
}

int shorten_overlong(const char *s, char **ret) {
        _cleanup_free_ char *h = NULL;

        /* Shorten an overlong name to HOST_NAME_MAX or to the first dot,
         * whatever comes earlier. */

        assert(s);
        assert(ret);

        h = strdup(s);
        if (!h)
                return -ENOMEM;

        if (hostname_is_valid(h, 0)) {
                *ret = TAKE_PTR(h);
                return 0;
        }

        char *p = strchr(h, '.');
        if (p)
                *p = 0;

        strshorten(h, HOST_NAME_MAX);

        if (!hostname_is_valid(h, /* flags= */ 0))
                return -EDOM;

        *ret = TAKE_PTR(h);
        return 1;
}

static int acquire_hostname_from_credential(char **ret) {
        _cleanup_free_ char *cred = NULL;
        int r;

        assert(ret);

        r = read_credential_with_decryption("system.hostname", (void **) &cred, /* ret_size= */ NULL);
        if (r < 0)
                return log_warning_errno(r, "Failed to read system.hostname credential, ignoring: %m");
        if (r == 0) /* not found */
                return -ENXIO;

        if (!hostname_is_valid(cred, VALID_HOSTNAME_TRAILING_DOT)) /* check that the hostname we return is valid */
                return log_warning_errno(SYNTHETIC_ERRNO(EBADMSG), "Hostname specified in system.hostname credential is invalid, ignoring: %s", cred);

        log_info("Initializing hostname from credential.");
        *ret = TAKE_PTR(cred);
        return 0;
}

int read_etc_hostname_stream(FILE *f, bool substitute_wildcards, char **ret) {
        int r;

        assert(f);
        assert(ret);

        for (;;) {
                _cleanup_free_ char *line = NULL;

                r = read_stripped_line(f, LONG_LINE_MAX, &line);
                if (r < 0)
                        return r;
                if (r == 0) /* EOF without any hostname? the file is empty, let's treat that exactly like no file at all: ENOENT */
                        return -ENOENT;

                /* File may have empty lines or comments, ignore them */
                if (IN_SET(line[0], '\0', '#'))
                        continue;

                if (substitute_wildcards) {
                        r = hostname_substitute_wildcards(line);
                        if (r < 0)
                                return r;
                }

                hostname_cleanup(line); /* normalize the hostname */

                /* check that the hostname we return is valid */
                if (!hostname_is_valid(
                                    line,
                                    VALID_HOSTNAME_TRAILING_DOT|
                                    (substitute_wildcards ? 0 : VALID_HOSTNAME_QUESTION_MARK)))
                        return -EBADMSG;

                *ret = TAKE_PTR(line);
                return 0;
        }
}

int read_etc_hostname(const char *path, bool substitute_wildcards, char **ret) {
        _cleanup_fclose_ FILE *f = NULL;

        assert(ret);

        if (!path)
                path = etc_hostname();

        f = fopen(path, "re");
        if (!f)
                return -errno;

        return read_etc_hostname_stream(f, substitute_wildcards, ret);
}

void hostname_update_source_hint(const char *hostname, HostnameSource source) {
        int r;

        assert(hostname);

        /* Why save the value and not just create a flag file? This way we will
         * notice if somebody sets the hostname directly (not going through hostnamed).
         */

        if (source == HOSTNAME_DEFAULT) {
                r = write_string_file("/run/systemd/default-hostname", hostname,
                                      WRITE_STRING_FILE_CREATE | WRITE_STRING_FILE_ATOMIC);
                if (r < 0)
                        log_warning_errno(r, "Failed to create \"/run/systemd/default-hostname\", ignoring: %m");
        } else
                (void) unlink_or_warn("/run/systemd/default-hostname");
}

int hostname_setup(bool really) {
        _cleanup_free_ char *hn = NULL;
        HostnameSource source;
        bool enoent = false;
        int r;

        r = proc_cmdline_get_key("systemd.hostname", 0, &hn);
        if (r < 0)
                log_warning_errno(r, "Failed to retrieve system hostname from kernel command line, ignoring: %m");
        else if (r > 0) {
                if (hostname_is_valid(hn, VALID_HOSTNAME_TRAILING_DOT))
                        source = HOSTNAME_TRANSIENT;
                else  {
                        log_warning("Hostname specified on kernel command line is invalid, ignoring: %s", hn);
                        hn = mfree(hn);
                }
        }

        if (!hn) {
                r = read_etc_hostname(/* path= */ NULL, /* substitute_wildcards= */ true, &hn);
                if (r == -ENOENT)
                        enoent = true;
                else if (r < 0)
                        log_warning_errno(r, "Failed to read configured hostname, ignoring: %m");
                else
                        source = HOSTNAME_STATIC;
        }

        if (!hn) {
                r = acquire_hostname_from_credential(&hn);
                if (r >= 0)
                        source = HOSTNAME_TRANSIENT;
        }

        if (!hn) {
                /* Don't override the hostname if it is already set and not explicitly configured */

                r = gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hn);
                if (r == -ENOMEM)
                        return log_oom();
                if (r >= 0) {
                        log_debug("No hostname configured, leaving existing hostname <%s> in place.", hn);
                        goto finish;
                }

                if (enoent)
                        log_info("No hostname configured, using default hostname.");

                hn = get_default_hostname();
                if (!hn)
                        return log_oom();

                source = HOSTNAME_DEFAULT;
        }

        r = sethostname_idempotent_full(hn, really);
        if (r < 0)
                return log_warning_errno(r, "Failed to set hostname to <%s>: %m", hn);
        if (r == 0)
                log_debug("Hostname was already set to <%s>.", hn);
        else
                log_info("Hostname %s to <%s>.",
                         really ? "set" : "would have been set",
                         hn);

        if (really)
                hostname_update_source_hint(hn, source);

finish:
        if (!in_initrd())
                (void) sd_notifyf(/* unset_environment= */ false, "X_SYSTEMD_HOSTNAME=%s", hn);

        return 0;
}

static const char* const hostname_source_table[] = {
        [HOSTNAME_STATIC]    = "static",
        [HOSTNAME_TRANSIENT] = "transient",
        [HOSTNAME_DEFAULT]   = "default",
};

DEFINE_STRING_TABLE_LOOKUP(hostname_source, HostnameSource);

int hostname_substitute_wildcards(char *name) {
        static const sd_id128_t key = SD_ID128_MAKE(98,10,ad,df,8d,7d,4f,b5,89,1b,4b,56,ac,c2,26,8f);
        sd_id128_t mid = SD_ID128_NULL;
        size_t left_bits = 0, counter = 0;
        uint64_t h = 0;
        int r;

        assert(name);

        /* Replaces every occurrence of '?' in the specified string with a nibble hashed from
         * /etc/machine-id. This is supposed to be used on /etc/hostname files that want to automatically
         * configure a hostname derived from the machine ID in some form.
         *
         * Note that this does not directly use the machine ID, because that's not necessarily supposed to be
         * public information to be broadcast on the network, while the hostname certainly is. */

        for (char *n = name; ; n++) {
                n = strchr(n, '?');
                if (!n)
                        return 0;

                if (left_bits <= 0) {
                        if (sd_id128_is_null(mid)) {
                                r = sd_id128_get_machine(&mid);
                                if (r < 0)
                                        return r;
                        }

                        struct siphash state;
                        siphash24_init(&state, key.bytes);
                        siphash24_compress(&mid, sizeof(mid), &state);
                        siphash24_compress(&counter, sizeof(counter), &state); /* counter mode */
                        h = siphash24_finalize(&state);
                        left_bits = sizeof(h) * 8;
                        counter++;
                }

                assert(left_bits >= 4);
                *n = hexchar(h & 0xf);
                h >>= 4;
                left_bits -= 4;
        }
}

char* get_default_hostname(void) {
        int r;

        _cleanup_free_ char *h = get_default_hostname_raw();
        if (!h)
                return NULL;

        r = hostname_substitute_wildcards(h);
        if (r < 0) {
                log_debug_errno(r, "Failed to substitute wildcards in hostname, falling back to built-in name: %m");
                return strdup(FALLBACK_HOSTNAME);
        }

        return TAKE_PTR(h);
}

int gethostname_full(GetHostnameFlags flags, char **ret) {
        _cleanup_free_ char *buf = NULL, *fallback = NULL;
        struct utsname u;
        const char *s;

        assert(ret);

        if (uname(&u) < 0)
                return -errno;

        s = u.nodename;
        if (isempty(s) || streq(s, "(none)") ||
            (!FLAGS_SET(flags, GET_HOSTNAME_ALLOW_LOCALHOST) && is_localhost(s)) ||
            (FLAGS_SET(flags, GET_HOSTNAME_SHORT) && s[0] == '.')) {
                if (!FLAGS_SET(flags, GET_HOSTNAME_FALLBACK_DEFAULT))
                        return -ENXIO;

                s = fallback = get_default_hostname();
                if (!s)
                        return -ENOMEM;

                if (FLAGS_SET(flags, GET_HOSTNAME_SHORT) && s[0] == '.')
                        return -ENXIO;
        }

        if (FLAGS_SET(flags, GET_HOSTNAME_SHORT))
                buf = strdupcspn(s, ".");
        else
                buf = strdup(s);
        if (!buf)
                return -ENOMEM;

        *ret = TAKE_PTR(buf);
        return 0;
}

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <stdio.h>
4	#include <sys/utsname.h>
5	#include <unistd.h>
6
7	#include "sd-daemon.h"
8
9	#include "alloc-util.h"
10	#include "creds-util.h"
11	#include "fd-util.h"
12	#include "fileio.h"
13	#include "fs-util.h"
14	#include "hexdecoct.h"
15	#include "hostname-setup.h"
16	#include "hostname-util.h"
17	#include "initrd-util.h"
18	#include "log.h"
19	#include "proc-cmdline.h"
20	#include "siphash24.h"
21	#include "string-table.h"
22	#include "string-util.h"
23
24	static int sethostname_idempotent_full(const char *s, bool really) {	282✔
25	struct utsname u;	282✔
26
27	assert(s);	282✔
28
29	if (uname(&u) < 0)	282✔
30	return -errno;	×
31
32	if (streq_ptr(s, u.nodename))	282✔
33	return 0;
34
35	if (really &&	334✔
36	sethostname(s, strlen(s)) < 0)	167✔
37	return -errno;	×
38
39	return 1;
40	}
41
42	int sethostname_idempotent(const char *s) {	245✔
43	return sethostname_idempotent_full(s, true);	245✔
44	}
45
46	int shorten_overlong(const char s, char *ret) {	89✔
47	_cleanup_free_ char *h = NULL;	89✔
48
49	/* Shorten an overlong name to HOST_NAME_MAX or to the first dot,
50	* whatever comes earlier. */
51
52	assert(s);	89✔
53	assert(ret);	89✔
54
55	h = strdup(s);	89✔
56	if (!h)	89✔
57	return -ENOMEM;
58
59	if (hostname_is_valid(h, 0)) {	89✔
60	*ret = TAKE_PTR(h);	86✔
61	return 0;	86✔
62	}
63
64	char *p = strchr(h, '.');	3✔
65	if (p)	3✔
66	*p = 0;	2✔
67
68	strshorten(h, HOST_NAME_MAX);	3✔
69
70	if (!hostname_is_valid(h, /* flags= */ 0))	3✔
71	return -EDOM;
72
73	*ret = TAKE_PTR(h);	2✔
74	return 1;	2✔
75	}
76
77	static int acquire_hostname_from_credential(char **ret) {	×
78	_cleanup_free_ char *cred = NULL;	×
79	int r;	×
80
81	assert(ret);	×
82
83	r = read_credential_with_decryption("system.hostname", (void *) &cred, / ret_size= */ NULL);	×
84	if (r < 0)	×
85	return log_warning_errno(r, "Failed to read system.hostname credential, ignoring: %m");	×
86	if (r == 0) /* not found */	×
87	return -ENXIO;
88
89	if (!hostname_is_valid(cred, VALID_HOSTNAME_TRAILING_DOT)) /* check that the hostname we return is valid */	×
90	return log_warning_errno(SYNTHETIC_ERRNO(EBADMSG), "Hostname specified in system.hostname credential is invalid, ignoring: %s", cred);	×
91
92	log_info("Initializing hostname from credential.");	×
93	*ret = TAKE_PTR(cred);	×
94	return 0;	×
95	}
96
97	int read_etc_hostname_stream(FILE f, bool substitute_wildcards, char *ret) {	64✔
98	int r;	64✔
99
100	assert(f);	64✔
101	assert(ret);	64✔
102
103	for (;;) {	72✔
104	_cleanup_free_ char *line = NULL;	68✔
105
106	r = read_stripped_line(f, LONG_LINE_MAX, &line);	68✔
107	if (r < 0)	68✔
108	return r;
109	if (r == 0) /* EOF without any hostname? the file is empty, let's treat that exactly like no file at all: ENOENT */	68✔
110	return -ENOENT;
111
112	/* File may have empty lines or comments, ignore them */
113	if (IN_SET(line[0], '\0', '#'))	13✔
114	continue;	4✔
115
116	if (substitute_wildcards) {	9✔
117	r = hostname_substitute_wildcards(line);	1✔
118	if (r < 0)	1✔
119	return r;
120	}
121
122	hostname_cleanup(line); /* normalize the hostname */	9✔
123
124	/* check that the hostname we return is valid */
125	if (!hostname_is_valid(	17✔
126	line,
127	VALID_HOSTNAME_TRAILING_DOT\|
128	(substitute_wildcards ? 0 : VALID_HOSTNAME_QUESTION_MARK)))
129	return -EBADMSG;
130
131	*ret = TAKE_PTR(line);	9✔
132	return 0;	9✔
133	}
134	}
135
136	int read_etc_hostname(const char path, bool substitute_wildcards, char *ret) {	221✔
137	_cleanup_fclose_ FILE *f = NULL;	221✔
138
139	assert(ret);	221✔
140
141	if (!path)	221✔
142	path = etc_hostname();	213✔
143
144	f = fopen(path, "re");	221✔
145	if (!f)	221✔
146	return -errno;	211✔
147
148	return read_etc_hostname_stream(f, substitute_wildcards, ret);	10✔
149	}
150
151	void hostname_update_source_hint(const char *hostname, HostnameSource source) {	112✔
152	int r;	112✔
153
154	assert(hostname);	112✔
155
156	/* Why save the value and not just create a flag file? This way we will
157	* notice if somebody sets the hostname directly (not going through hostnamed).
158	*/
159
160	if (source == HOSTNAME_DEFAULT) {	112✔
161	r = write_string_file("/run/systemd/default-hostname", hostname,	35✔
162	WRITE_STRING_FILE_CREATE \| WRITE_STRING_FILE_ATOMIC);
163	if (r < 0)	35✔
164	log_warning_errno(r, "Failed to create \"/run/systemd/default-hostname\", ignoring: %m");	×
165	} else
166	(void) unlink_or_warn("/run/systemd/default-hostname");	77✔
167	}	112✔
168
169	int hostname_setup(bool really) {	37✔
170	_cleanup_free_ char *hn = NULL;	37✔
171	HostnameSource source;	37✔
172	bool enoent = false;	37✔
173	int r;	37✔
174
175	r = proc_cmdline_get_key("systemd.hostname", 0, &hn);	37✔
176	if (r < 0)	37✔
177	log_warning_errno(r, "Failed to retrieve system hostname from kernel command line, ignoring: %m");	×
178	else if (r > 0) {	37✔
179	if (hostname_is_valid(hn, VALID_HOSTNAME_TRAILING_DOT))	37✔
180	source = HOSTNAME_TRANSIENT;
181	else {
182	log_warning("Hostname specified on kernel command line is invalid, ignoring: %s", hn);	×
183	hn = mfree(hn);	×
184	}
185	}
186
187	if (!hn) {	37✔
188	r = read_etc_hostname(/* path= / NULL, / substitute_wildcards= */ true, &hn);	×
189	if (r == -ENOENT)	×
190	enoent = true;
191	else if (r < 0)	×
192	log_warning_errno(r, "Failed to read configured hostname, ignoring: %m");	×
193	else
194	source = HOSTNAME_STATIC;
195	}
196
197	if (!hn) {	37✔
198	r = acquire_hostname_from_credential(&hn);	×
199	if (r >= 0)	×
200	source = HOSTNAME_TRANSIENT;	×
201	}
202
203	if (!hn) {	37✔
204	/* Don't override the hostname if it is already set and not explicitly configured */
205
206	r = gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hn);	×
207	if (r == -ENOMEM)	×
208	return log_oom();	×
209	if (r >= 0) {	×
210	log_debug("No hostname configured, leaving existing hostname <%s> in place.", hn);	×
211	goto finish;	×
212	}
213
214	if (enoent)	×
215	log_info("No hostname configured, using default hostname.");	×
216
217	hn = get_default_hostname();	×
218	if (!hn)	×
219	return log_oom();	×
220
221	source = HOSTNAME_DEFAULT;
222	}
223
224	r = sethostname_idempotent_full(hn, really);	37✔
225	if (r < 0)	37✔
226	return log_warning_errno(r, "Failed to set hostname to <%s>: %m", hn);	×
227	if (r == 0)	37✔
228	log_debug("Hostname was already set to <%s>.", hn);	4✔
229	else
230	log_info("Hostname %s to <%s>.",	33✔
231	really ? "set" : "would have been set",
232	hn);
233
234	if (really)	37✔
235	hostname_update_source_hint(hn, source);	36✔
236
237	finish:	1✔
238	if (!in_initrd())	37✔
239	(void) sd_notifyf(/* unset_environment= */ false, "X_SYSTEMD_HOSTNAME=%s", hn);	26✔
240
241	return 0;
242	}
243
244	static const char* const hostname_source_table[] = {
245	[HOSTNAME_STATIC] = "static",
246	[HOSTNAME_TRANSIENT] = "transient",
247	[HOSTNAME_DEFAULT] = "default",
248	};
249
250	DEFINE_STRING_TABLE_LOOKUP(hostname_source, HostnameSource);	163✔
251
252	int hostname_substitute_wildcards(char *name) {	230✔
253	static const sd_id128_t key = SD_ID128_MAKE(98,10,ad,df,8d,7d,4f,b5,89,1b,4b,56,ac,c2,26,8f);	230✔
254	sd_id128_t mid = SD_ID128_NULL;	230✔
255	size_t left_bits = 0, counter = 0;	230✔
256	uint64_t h = 0;	230✔
257	int r;	230✔
258
259	assert(name);	230✔
260
261	/* Replaces every occurrence of '?' in the specified string with a nibble hashed from
262	* /etc/machine-id. This is supposed to be used on /etc/hostname files that want to automatically
263	* configure a hostname derived from the machine ID in some form.
264	*
265	* Note that this does not directly use the machine ID, because that's not necessarily supposed to be
266	* public information to be broadcast on the network, while the hostname certainly is. */
267
268	for (char *n = name; ; n++) {	23✔
269	n = strchr(n, '?');	276✔
270	if (!n)	253✔
271	return 0;	230✔
272
273	if (left_bits <= 0) {	23✔
274	if (sd_id128_is_null(mid)) {	3✔
275	r = sd_id128_get_machine(&mid);	2✔
276	if (r < 0)	2✔
277	return r;	×
278	}
279
280	struct siphash state;	3✔
281	siphash24_init(&state, key.bytes);	3✔
282	siphash24_compress(&mid, sizeof(mid), &state);	3✔
283	siphash24_compress(&counter, sizeof(counter), &state); /* counter mode */	3✔
284	h = siphash24_finalize(&state);	3✔
285	left_bits = sizeof(h) * 8;	3✔
286	counter++;	3✔
287	}
288
289	assert(left_bits >= 4);	23✔
290	*n = hexchar(h & 0xf);	23✔
291	h >>= 4;	23✔
292	left_bits -= 4;	23✔
293	}
294	}
295
296	char* get_default_hostname(void) {	47✔
297	int r;	47✔
298
299	_cleanup_free_ char *h = get_default_hostname_raw();	94✔
300	if (!h)	47✔
301	return NULL;
302
303	r = hostname_substitute_wildcards(h);	47✔
304	if (r < 0) {	47✔
305	log_debug_errno(r, "Failed to substitute wildcards in hostname, falling back to built-in name: %m");	×
306	return strdup(FALLBACK_HOSTNAME);	×
307	}
308
309	return TAKE_PTR(h);
310	}
311
312	int gethostname_full(GetHostnameFlags flags, char **ret) {	1,374✔
313	_cleanup_free_ char buf = NULL, fallback = NULL;	1,374✔
314	struct utsname u;	1,374✔
315	const char *s;	1,374✔
316
317	assert(ret);	1,374✔
318
319	if (uname(&u) < 0)	1,374✔
320	return -errno;	×
321
322	s = u.nodename;	1,374✔
323	if (isempty(s) \|\| streq(s, "(none)") \|\|	1,374✔
324	(!FLAGS_SET(flags, GET_HOSTNAME_ALLOW_LOCALHOST) && is_localhost(s)) \|\|	1,374✔
325	(FLAGS_SET(flags, GET_HOSTNAME_SHORT) && s[0] == '.')) {	1,374✔
326	if (!FLAGS_SET(flags, GET_HOSTNAME_FALLBACK_DEFAULT))	×
327	return -ENXIO;
328
329	s = fallback = get_default_hostname();	×
330	if (!s)	×
331	return -ENOMEM;
332
333	if (FLAGS_SET(flags, GET_HOSTNAME_SHORT) && s[0] == '.')	×
334	return -ENXIO;
335	}
336
337	if (FLAGS_SET(flags, GET_HOSTNAME_SHORT))	8✔
338	buf = strdupcspn(s, ".");	8✔
339	else
340	buf = strdup(s);	1,366✔
341	if (!buf)	1,374✔
342	return -ENOMEM;
343
344	*ret = TAKE_PTR(buf);	1,374✔
345	return 0;	1,374✔
346	}

systemd / systemd / 17014398938

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