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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 | ||
302e8c4c | 35 | #if defined(TARGET_FEDORA) |
ea6145da LP |
36 | #define FILENAME "/etc/sysconfig/network" |
37 | #elif defined(TARGET_SUSE) | |
38 | #define FILENAME "/etc/HOSTNAME" | |
39 | #elif defined(TARGET_DEBIAN) | |
40 | #define FILENAME "/etc/hostname" | |
41 | #elif defined(TARGET_ARCH) | |
42 | #define FILENAME "/etc/rc.conf" | |
3177a7fa MAP |
43 | #elif defined(TARGET_GENTOO) |
44 | #define FILENAME "/etc/conf.d/hostname" | |
ea6145da | 45 | #endif |
302e8c4c | 46 | |
a06b0b56 LP |
47 | static char* strip_bad_chars(char *s) { |
48 | char *p, *d; | |
49 | ||
50 | for (p = s, d = s; *p; p++) | |
51 | if ((*p >= 'a' && *p <= 'z') || | |
52 | (*p >= 'A' && *p <= 'Z') || | |
53 | (*p >= '0' && *p <= '9') || | |
54 | *p == '-' || | |
55 | *p == '_') | |
56 | *(d++) = *p; | |
57 | ||
58 | *d = 0; | |
59 | ||
60 | return s; | |
61 | } | |
62 | ||
ea6145da | 63 | static int read_hostname(char **hn) { |
302e8c4c | 64 | |
3177a7fa | 65 | #if defined(TARGET_FEDORA) || defined(TARGET_ARCH) || defined(TARGET_GENTOO) |
d7c114c0 DR |
66 | int r; |
67 | FILE *f; | |
68 | ||
69 | assert(hn); | |
70 | ||
ea6145da | 71 | if (!(f = fopen(FILENAME, "re"))) |
d7c114c0 DR |
72 | return -errno; |
73 | ||
74 | for (;;) { | |
75 | char line[LINE_MAX]; | |
76 | char *s, *k; | |
77 | ||
78 | if (!fgets(line, sizeof(line), f)) { | |
79 | if (feof(f)) | |
80 | break; | |
81 | ||
82 | r = -errno; | |
83 | goto finish; | |
84 | } | |
85 | ||
86 | s = strstrip(line); | |
87 | ||
3177a7fa | 88 | if (!startswith_no_case(s, "HOSTNAME=")) |
d7c114c0 DR |
89 | continue; |
90 | ||
91 | if (!(k = strdup(s+9))) { | |
92 | r = -ENOMEM; | |
93 | goto finish; | |
94 | } | |
95 | ||
a06b0b56 LP |
96 | strip_bad_chars(k); |
97 | ||
98 | if (k[0] == 0) { | |
99 | free(k); | |
100 | r = -ENOENT; | |
3177a7fa MAP |
101 | goto finish; |
102 | } | |
103 | ||
d7c114c0 DR |
104 | *hn = k; |
105 | break; | |
106 | } | |
107 | ||
108 | r = 0; | |
109 | ||
110 | finish: | |
111 | fclose(f); | |
112 | return r; | |
113 | ||
ea6145da | 114 | #elif defined(TARGET_SUSE) || defined(TARGET_DEBIAN) |
206bf5c2 KS |
115 | int r; |
116 | char *s, *k; | |
117 | ||
118 | assert(hn); | |
119 | ||
ea6145da | 120 | if ((r = read_one_line_file(FILENAME, &s)) < 0) |
206bf5c2 KS |
121 | return r; |
122 | ||
123 | k = strdup(strstrip(s)); | |
124 | free(s); | |
125 | ||
126 | if (!k) | |
127 | return -ENOMEM; | |
128 | ||
a06b0b56 LP |
129 | strip_bad_chars(k); |
130 | ||
131 | if (k[0] == 0) { | |
132 | free(k); | |
133 | return -NOENT; | |
134 | } | |
135 | ||
206bf5c2 KS |
136 | *hn = k; |
137 | ||
302e8c4c | 138 | #else |
206bf5c2 | 139 | #warning "Don't know how to read the hostname" |
302e8c4c LP |
140 | |
141 | return -ENOENT; | |
142 | #endif | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | int hostname_setup(void) { | |
148 | int r; | |
149 | char *hn; | |
150 | ||
151 | if ((r = read_hostname(&hn)) < 0) { | |
152 | if (r != -ENOENT) | |
153 | log_warning("Failed to read configured hostname: %s", strerror(-r)); | |
154 | ||
155 | return r; | |
156 | } | |
157 | ||
158 | r = sethostname(hn, strlen(hn)) < 0 ? -errno : 0; | |
159 | ||
160 | if (r < 0) | |
161 | log_warning("Failed to set hostname to <%s>: %s", hn, strerror(-r)); | |
162 | else | |
163 | log_info("Set hostname to <%s>.", hn); | |
164 | ||
165 | free(hn); | |
166 | ||
167 | return r; | |
168 | } |