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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 | ||
6fdae8a6 | 33 | #if defined(TARGET_FEDORA) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MEEGO) || defined(TARGET_MAGEIA) |
ea6145da | 34 | #define FILENAME "/etc/sysconfig/network" |
b5dc29c0 | 35 | #elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE) |
ea6145da | 36 | #define FILENAME "/etc/HOSTNAME" |
ea6145da LP |
37 | #elif defined(TARGET_ARCH) |
38 | #define FILENAME "/etc/rc.conf" | |
3177a7fa MAP |
39 | #elif defined(TARGET_GENTOO) |
40 | #define FILENAME "/etc/conf.d/hostname" | |
ea6145da | 41 | #endif |
302e8c4c | 42 | |
28695e0f | 43 | static int read_and_strip_hostname(const char *path, char **hn) { |
9beb3f4d | 44 | char *s; |
28695e0f LP |
45 | int r; |
46 | ||
47 | assert(path); | |
48 | assert(hn); | |
49 | ||
50 | if ((r = read_one_line_file(path, &s)) < 0) | |
51 | return r; | |
52 | ||
9beb3f4d | 53 | hostname_cleanup(s); |
28695e0f | 54 | |
9beb3f4d LP |
55 | if (isempty(s)) { |
56 | free(s); | |
28695e0f LP |
57 | return -ENOENT; |
58 | } | |
59 | ||
9beb3f4d | 60 | *hn = s; |
28695e0f LP |
61 | |
62 | return 0; | |
63 | } | |
64 | ||
e5907703 | 65 | static int read_distro_hostname(char **hn) { |
302e8c4c | 66 | |
6fdae8a6 | 67 | #if defined(TARGET_FEDORA) || defined(TARGET_ARCH) || defined(TARGET_GENTOO) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MEEGO) || defined(TARGET_MAGEIA) |
d7c114c0 DR |
68 | int r; |
69 | FILE *f; | |
70 | ||
71 | assert(hn); | |
72 | ||
ea6145da | 73 | if (!(f = fopen(FILENAME, "re"))) |
d7c114c0 DR |
74 | return -errno; |
75 | ||
76 | for (;;) { | |
77 | char line[LINE_MAX]; | |
78 | char *s, *k; | |
79 | ||
80 | if (!fgets(line, sizeof(line), f)) { | |
81 | if (feof(f)) | |
82 | break; | |
83 | ||
84 | r = -errno; | |
85 | goto finish; | |
86 | } | |
87 | ||
88 | s = strstrip(line); | |
89 | ||
3177a7fa | 90 | if (!startswith_no_case(s, "HOSTNAME=")) |
d7c114c0 DR |
91 | continue; |
92 | ||
93 | if (!(k = strdup(s+9))) { | |
94 | r = -ENOMEM; | |
95 | goto finish; | |
96 | } | |
97 | ||
9beb3f4d | 98 | hostname_cleanup(k); |
a06b0b56 | 99 | |
9beb3f4d | 100 | if (isempty(k)) { |
a06b0b56 LP |
101 | free(k); |
102 | r = -ENOENT; | |
3177a7fa MAP |
103 | goto finish; |
104 | } | |
105 | ||
d7c114c0 | 106 | *hn = k; |
84b00965 LP |
107 | r = 0; |
108 | goto finish; | |
d7c114c0 DR |
109 | } |
110 | ||
84b00965 | 111 | r = -ENOENT; |
d7c114c0 DR |
112 | |
113 | finish: | |
114 | fclose(f); | |
115 | return r; | |
116 | ||
b5dc29c0 | 117 | #elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE) |
28695e0f | 118 | return read_and_strip_hostname(FILENAME, hn); |
302e8c4c | 119 | #else |
302e8c4c LP |
120 | return -ENOENT; |
121 | #endif | |
e5907703 LP |
122 | } |
123 | ||
124 | static int read_hostname(char **hn) { | |
125 | int r; | |
e5907703 LP |
126 | |
127 | assert(hn); | |
128 | ||
129 | /* First, try to load the generic hostname configuration file, | |
130 | * that we support on all distributions */ | |
131 | ||
28695e0f | 132 | if ((r = read_and_strip_hostname("/etc/hostname", hn)) < 0) { |
e5907703 LP |
133 | |
134 | if (r == -ENOENT) | |
135 | return read_distro_hostname(hn); | |
136 | ||
137 | return r; | |
138 | } | |
139 | ||
302e8c4c LP |
140 | return 0; |
141 | } | |
142 | ||
143 | int hostname_setup(void) { | |
144 | int r; | |
28695e0f LP |
145 | char *b = NULL; |
146 | const char *hn = NULL; | |
302e8c4c | 147 | |
28695e0f LP |
148 | if ((r = read_hostname(&b)) < 0) { |
149 | if (r == -ENOENT) | |
150 | log_info("No hostname configured."); | |
151 | else | |
302e8c4c LP |
152 | log_warning("Failed to read configured hostname: %s", strerror(-r)); |
153 | ||
9bec0b1e | 154 | hn = NULL; |
28695e0f LP |
155 | } else |
156 | hn = b; | |
302e8c4c | 157 | |
9bec0b1e LP |
158 | if (!hn) { |
159 | /* Don't override the hostname if it is unset and not | |
160 | * explicitly configured */ | |
161 | ||
162 | char *old_hostname = NULL; | |
163 | ||
164 | if ((old_hostname = gethostname_malloc())) { | |
165 | bool already_set; | |
166 | ||
167 | already_set = old_hostname[0] != 0; | |
168 | free(old_hostname); | |
169 | ||
170 | if (already_set) | |
171 | goto finish; | |
172 | } | |
173 | ||
174 | hn = "localhost"; | |
175 | } | |
176 | ||
28695e0f LP |
177 | if (sethostname(hn, strlen(hn)) < 0) { |
178 | log_warning("Failed to set hostname to <%s>: %m", hn); | |
179 | r = -errno; | |
180 | } else | |
302e8c4c LP |
181 | log_info("Set hostname to <%s>.", hn); |
182 | ||
9bec0b1e | 183 | finish: |
28695e0f | 184 | free(b); |
302e8c4c LP |
185 | |
186 | return r; | |
187 | } |