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4295c5de SH |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Daniel Lezcano <daniel.lezcano at free.fr> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | #include "initutils.h" | |
25 | #include "log.h" | |
26 | ||
27 | lxc_log_define(lxc_initutils, lxc); | |
28 | ||
29 | static int mount_fs(const char *source, const char *target, const char *type) | |
30 | { | |
31 | /* the umount may fail */ | |
32 | if (umount(target)) | |
33 | WARN("failed to unmount %s : %s", target, strerror(errno)); | |
34 | ||
35 | if (mount(source, target, type, 0, NULL)) { | |
36 | ERROR("failed to mount %s : %s", target, strerror(errno)); | |
37 | return -1; | |
38 | } | |
39 | ||
40 | DEBUG("'%s' mounted on '%s'", source, target); | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | extern void lxc_setup_fs(void) | |
46 | { | |
47 | if (mount_fs("proc", "/proc", "proc")) | |
48 | INFO("failed to remount proc"); | |
49 | ||
81e3c9cf BP |
50 | /* if /dev has been populated by us, /dev/shm does not exist */ |
51 | if (access("/dev/shm", F_OK) && mkdir("/dev/shm", 0777)) | |
52 | INFO("failed to create /dev/shm"); | |
53 | ||
4295c5de SH |
54 | /* if we can't mount /dev/shm, continue anyway */ |
55 | if (mount_fs("shmfs", "/dev/shm", "tmpfs")) | |
56 | INFO("failed to mount /dev/shm"); | |
57 | ||
58 | /* If we were able to mount /dev/shm, then /dev exists */ | |
59 | /* Sure, but it's read-only per config :) */ | |
60 | if (access("/dev/mqueue", F_OK) && mkdir("/dev/mqueue", 0666)) { | |
61 | DEBUG("failed to create '/dev/mqueue'"); | |
62 | return; | |
63 | } | |
64 | ||
65 | /* continue even without posix message queue support */ | |
66 | if (mount_fs("mqueue", "/dev/mqueue", "mqueue")) | |
67 | INFO("failed to mount /dev/mqueue"); | |
68 | } | |
69 | ||
70 | static char *copy_global_config_value(char *p) | |
71 | { | |
72 | int len = strlen(p); | |
73 | char *retbuf; | |
74 | ||
75 | if (len < 1) | |
76 | return NULL; | |
77 | if (p[len-1] == '\n') { | |
78 | p[len-1] = '\0'; | |
79 | len--; | |
80 | } | |
81 | retbuf = malloc(len+1); | |
82 | if (!retbuf) | |
83 | return NULL; | |
84 | strcpy(retbuf, p); | |
85 | return retbuf; | |
86 | } | |
87 | ||
88 | const char *lxc_global_config_value(const char *option_name) | |
89 | { | |
90 | static const char * const options[][2] = { | |
91 | { "lxc.bdev.lvm.vg", DEFAULT_VG }, | |
92 | { "lxc.bdev.lvm.thin_pool", DEFAULT_THIN_POOL }, | |
93 | { "lxc.bdev.zfs.root", DEFAULT_ZFSROOT }, | |
7da812df | 94 | { "lxc.bdev.rbd.rbdpool", DEFAULT_RBDPOOL }, |
4295c5de SH |
95 | { "lxc.lxcpath", NULL }, |
96 | { "lxc.default_config", NULL }, | |
97 | { "lxc.cgroup.pattern", NULL }, | |
98 | { "lxc.cgroup.use", NULL }, | |
99 | { NULL, NULL }, | |
100 | }; | |
101 | ||
102 | /* placed in the thread local storage pool for non-bionic targets */ | |
103 | #ifdef HAVE_TLS | |
104 | static __thread const char *values[sizeof(options) / sizeof(options[0])] = { 0 }; | |
105 | #else | |
106 | static const char *values[sizeof(options) / sizeof(options[0])] = { 0 }; | |
107 | #endif | |
108 | ||
109 | /* user_config_path is freed as soon as it is used */ | |
110 | char *user_config_path = NULL; | |
111 | ||
112 | /* | |
113 | * The following variables are freed at bottom unconditionally. | |
114 | * So NULL the value if it is to be returned to the caller | |
115 | */ | |
116 | char *user_default_config_path = NULL; | |
117 | char *user_lxc_path = NULL; | |
118 | char *user_cgroup_pattern = NULL; | |
119 | ||
120 | if (geteuid() > 0) { | |
121 | const char *user_home = getenv("HOME"); | |
122 | if (!user_home) | |
123 | user_home = "/"; | |
124 | ||
125 | user_config_path = malloc(sizeof(char) * (22 + strlen(user_home))); | |
126 | user_default_config_path = malloc(sizeof(char) * (26 + strlen(user_home))); | |
127 | user_lxc_path = malloc(sizeof(char) * (19 + strlen(user_home))); | |
128 | ||
129 | sprintf(user_config_path, "%s/.config/lxc/lxc.conf", user_home); | |
130 | sprintf(user_default_config_path, "%s/.config/lxc/default.conf", user_home); | |
131 | sprintf(user_lxc_path, "%s/.local/share/lxc/", user_home); | |
132 | user_cgroup_pattern = strdup("lxc/%n"); | |
133 | } | |
134 | else { | |
135 | user_config_path = strdup(LXC_GLOBAL_CONF); | |
136 | user_default_config_path = strdup(LXC_DEFAULT_CONFIG); | |
137 | user_lxc_path = strdup(LXCPATH); | |
138 | user_cgroup_pattern = strdup(DEFAULT_CGROUP_PATTERN); | |
139 | } | |
140 | ||
141 | const char * const (*ptr)[2]; | |
142 | size_t i; | |
143 | char buf[1024], *p, *p2; | |
144 | FILE *fin = NULL; | |
145 | ||
146 | for (i = 0, ptr = options; (*ptr)[0]; ptr++, i++) { | |
147 | if (!strcmp(option_name, (*ptr)[0])) | |
148 | break; | |
149 | } | |
150 | if (!(*ptr)[0]) { | |
151 | free(user_config_path); | |
152 | free(user_default_config_path); | |
153 | free(user_lxc_path); | |
154 | free(user_cgroup_pattern); | |
155 | errno = EINVAL; | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | if (values[i]) { | |
160 | free(user_config_path); | |
161 | free(user_default_config_path); | |
162 | free(user_lxc_path); | |
163 | free(user_cgroup_pattern); | |
164 | return values[i]; | |
165 | } | |
166 | ||
167 | fin = fopen_cloexec(user_config_path, "r"); | |
168 | free(user_config_path); | |
169 | if (fin) { | |
170 | while (fgets(buf, 1024, fin)) { | |
171 | if (buf[0] == '#') | |
172 | continue; | |
173 | p = strstr(buf, option_name); | |
174 | if (!p) | |
175 | continue; | |
176 | /* see if there was just white space in front | |
177 | * of the option name | |
178 | */ | |
179 | for (p2 = buf; p2 < p; p2++) { | |
180 | if (*p2 != ' ' && *p2 != '\t') | |
181 | break; | |
182 | } | |
183 | if (p2 < p) | |
184 | continue; | |
185 | p = strchr(p, '='); | |
186 | if (!p) | |
187 | continue; | |
188 | /* see if there was just white space after | |
189 | * the option name | |
190 | */ | |
191 | for (p2 += strlen(option_name); p2 < p; p2++) { | |
192 | if (*p2 != ' ' && *p2 != '\t') | |
193 | break; | |
194 | } | |
195 | if (p2 < p) | |
196 | continue; | |
197 | p++; | |
198 | while (*p && (*p == ' ' || *p == '\t')) p++; | |
199 | if (!*p) | |
200 | continue; | |
201 | ||
202 | if (strcmp(option_name, "lxc.lxcpath") == 0) { | |
203 | free(user_lxc_path); | |
204 | user_lxc_path = copy_global_config_value(p); | |
205 | remove_trailing_slashes(user_lxc_path); | |
206 | values[i] = user_lxc_path; | |
207 | user_lxc_path = NULL; | |
208 | goto out; | |
209 | } | |
210 | ||
211 | values[i] = copy_global_config_value(p); | |
212 | goto out; | |
213 | } | |
214 | } | |
215 | /* could not find value, use default */ | |
216 | if (strcmp(option_name, "lxc.lxcpath") == 0) { | |
217 | remove_trailing_slashes(user_lxc_path); | |
218 | values[i] = user_lxc_path; | |
219 | user_lxc_path = NULL; | |
220 | } | |
221 | else if (strcmp(option_name, "lxc.default_config") == 0) { | |
222 | values[i] = user_default_config_path; | |
223 | user_default_config_path = NULL; | |
224 | } | |
225 | else if (strcmp(option_name, "lxc.cgroup.pattern") == 0) { | |
226 | values[i] = user_cgroup_pattern; | |
227 | user_cgroup_pattern = NULL; | |
228 | } | |
229 | else | |
230 | values[i] = (*ptr)[1]; | |
231 | ||
232 | /* special case: if default value is NULL, | |
233 | * and there is no config, don't view that | |
234 | * as an error... */ | |
235 | if (!values[i]) | |
236 | errno = 0; | |
237 | ||
238 | out: | |
239 | if (fin) | |
240 | fclose(fin); | |
241 | ||
242 | free(user_cgroup_pattern); | |
243 | free(user_default_config_path); | |
244 | free(user_lxc_path); | |
245 | ||
246 | return values[i]; | |
247 | } | |
248 | ||
249 | extern void remove_trailing_slashes(char *p) | |
250 | { | |
251 | int l = strlen(p); | |
252 | while (--l >= 0 && (p[l] == '/' || p[l] == '\n')) | |
253 | p[l] = '\0'; | |
254 | } | |
255 | ||
256 | FILE *fopen_cloexec(const char *path, const char *mode) | |
257 | { | |
258 | int open_mode = 0; | |
259 | int step = 0; | |
260 | int fd; | |
261 | int saved_errno = 0; | |
262 | FILE *ret; | |
263 | ||
264 | if (!strncmp(mode, "r+", 2)) { | |
265 | open_mode = O_RDWR; | |
266 | step = 2; | |
267 | } else if (!strncmp(mode, "r", 1)) { | |
268 | open_mode = O_RDONLY; | |
269 | step = 1; | |
270 | } else if (!strncmp(mode, "w+", 2)) { | |
271 | open_mode = O_RDWR | O_TRUNC | O_CREAT; | |
272 | step = 2; | |
273 | } else if (!strncmp(mode, "w", 1)) { | |
274 | open_mode = O_WRONLY | O_TRUNC | O_CREAT; | |
275 | step = 1; | |
276 | } else if (!strncmp(mode, "a+", 2)) { | |
277 | open_mode = O_RDWR | O_CREAT | O_APPEND; | |
278 | step = 2; | |
279 | } else if (!strncmp(mode, "a", 1)) { | |
280 | open_mode = O_WRONLY | O_CREAT | O_APPEND; | |
281 | step = 1; | |
282 | } | |
283 | for (; mode[step]; step++) | |
284 | if (mode[step] == 'x') | |
285 | open_mode |= O_EXCL; | |
286 | open_mode |= O_CLOEXEC; | |
287 | ||
288 | fd = open(path, open_mode, 0666); | |
289 | if (fd < 0) | |
290 | return NULL; | |
291 | ||
292 | ret = fdopen(fd, mode); | |
293 | saved_errno = errno; | |
294 | if (!ret) | |
295 | close(fd); | |
296 | errno = saved_errno; | |
297 | return ret; | |
298 | } |