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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
302e8c4c LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
302e8c4c LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
302e8c4c | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
302e8c4c LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <unistd.h> | |
23 | #include <stdio.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
27 | ||
28 | #include "hostname-setup.h" | |
29 | #include "macro.h" | |
30 | #include "util.h" | |
31 | #include "log.h" | |
32 | ||
28695e0f | 33 | static int read_and_strip_hostname(const char *path, char **hn) { |
9beb3f4d | 34 | char *s; |
28695e0f LP |
35 | int r; |
36 | ||
37 | assert(path); | |
38 | assert(hn); | |
39 | ||
fb3d2b8f LP |
40 | r = read_one_line_file(path, &s); |
41 | if (r < 0) | |
28695e0f LP |
42 | return r; |
43 | ||
9beb3f4d | 44 | hostname_cleanup(s); |
28695e0f | 45 | |
9beb3f4d LP |
46 | if (isempty(s)) { |
47 | free(s); | |
28695e0f LP |
48 | return -ENOENT; |
49 | } | |
50 | ||
9beb3f4d | 51 | *hn = s; |
302e8c4c LP |
52 | return 0; |
53 | } | |
54 | ||
55 | int hostname_setup(void) { | |
56 | int r; | |
46a2911b LP |
57 | _cleanup_free_ char *b = NULL; |
58 | const char *hn; | |
fb3d2b8f | 59 | bool enoent = false; |
302e8c4c | 60 | |
46a2911b | 61 | r = read_and_strip_hostname("/etc/hostname", &b); |
fb3d2b8f | 62 | if (r < 0) { |
28695e0f | 63 | if (r == -ENOENT) |
fb3d2b8f | 64 | enoent = true; |
28695e0f | 65 | else |
302e8c4c | 66 | log_warning("Failed to read configured hostname: %s", strerror(-r)); |
46a2911b LP |
67 | |
68 | hn = NULL; | |
28695e0f LP |
69 | } else |
70 | hn = b; | |
302e8c4c | 71 | |
344de609 LP |
72 | if (isempty(hn)) { |
73 | /* Don't override the hostname if it is already set | |
74 | * and not explicitly configured */ | |
75 | if (hostname_is_set()) | |
46a2911b | 76 | return 0; |
9bec0b1e | 77 | |
fb3d2b8f LP |
78 | if (enoent) |
79 | log_info("No hostname configured."); | |
80 | ||
9bec0b1e LP |
81 | hn = "localhost"; |
82 | } | |
83 | ||
28695e0f LP |
84 | if (sethostname(hn, strlen(hn)) < 0) { |
85 | log_warning("Failed to set hostname to <%s>: %m", hn); | |
46a2911b LP |
86 | return -errno; |
87 | } | |
302e8c4c | 88 | |
46a2911b LP |
89 | log_info("Set hostname to <%s>.", hn); |
90 | return 0; | |
302e8c4c | 91 | } |