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302e8c4c LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
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 | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
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 | ||
33 | #define LINE_MAX 4096 | |
34 | ||
35 | static int read_hostname(char **hn) { | |
36 | ||
37 | #if defined(TARGET_FEDORA) | |
38 | int r; | |
39 | FILE *f; | |
40 | ||
41 | assert(hn); | |
42 | ||
43 | if (!(f = fopen("/etc/sysconfig/network", "re"))) | |
44 | return -errno; | |
45 | ||
46 | for (;;) { | |
47 | char line[LINE_MAX]; | |
48 | char *s, *k; | |
49 | ||
50 | if (!fgets(line, sizeof(line), f)) { | |
51 | if (feof(f)) | |
52 | break; | |
53 | ||
54 | r = -errno; | |
55 | goto finish; | |
56 | } | |
57 | ||
58 | s = strstrip(line); | |
59 | ||
60 | if (!startswith(s, "HOSTNAME=")) | |
61 | continue; | |
62 | ||
63 | if (!(k = strdup(s+9))) { | |
64 | r = -ENOMEM; | |
65 | goto finish; | |
66 | } | |
67 | ||
68 | *hn = k; | |
69 | break; | |
70 | } | |
71 | ||
72 | r = 0; | |
73 | ||
74 | finish: | |
75 | fclose(f); | |
76 | return r; | |
77 | ||
206bf5c2 KS |
78 | #elif defined(TARGET_SUSE) |
79 | int r; | |
80 | char *s, *k; | |
81 | ||
82 | assert(hn); | |
83 | ||
84 | if ((r = read_one_line_file("/etc/HOSTNAME", &s)) < 0) | |
85 | return r; | |
86 | ||
87 | k = strdup(strstrip(s)); | |
88 | free(s); | |
89 | ||
90 | if (!k) | |
91 | return -ENOMEM; | |
92 | ||
93 | *hn = k; | |
94 | ||
302e8c4c LP |
95 | #elif defined(TARGET_DEBIAN) |
96 | int r; | |
97 | char *s, *k; | |
98 | ||
99 | assert(hn); | |
100 | ||
101 | if ((r = read_one_line_file("/etc/hostname", &s)) < 0) | |
102 | return r; | |
103 | ||
104 | k = strdup(strstrip(s)); | |
105 | free(s); | |
106 | ||
107 | if (!k) | |
108 | return -ENOMEM; | |
109 | ||
110 | *hn = k; | |
111 | #else | |
206bf5c2 | 112 | #warning "Don't know how to read the hostname" |
302e8c4c LP |
113 | |
114 | return -ENOENT; | |
115 | #endif | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | int hostname_setup(void) { | |
121 | int r; | |
122 | char *hn; | |
123 | ||
124 | if ((r = read_hostname(&hn)) < 0) { | |
125 | if (r != -ENOENT) | |
126 | log_warning("Failed to read configured hostname: %s", strerror(-r)); | |
127 | ||
128 | return r; | |
129 | } | |
130 | ||
131 | r = sethostname(hn, strlen(hn)) < 0 ? -errno : 0; | |
132 | ||
133 | if (r < 0) | |
134 | log_warning("Failed to set hostname to <%s>: %s", hn, strerror(-r)); | |
135 | else | |
136 | log_info("Set hostname to <%s>.", hn); | |
137 | ||
138 | free(hn); | |
139 | ||
140 | return r; | |
141 | } |