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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Daniel Lezcano <dlezcano at fr.ibm.com> | |
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #define _GNU_SOURCE | |
25 | #include <stdio.h> | |
26 | #undef _GNU_SOURCE | |
27 | #include <string.h> | |
28 | #include <stdlib.h> | |
29 | #include <dirent.h> | |
30 | #include <errno.h> | |
31 | #include <unistd.h> | |
32 | #include <signal.h> | |
0ad19a3f | 33 | #include <sys/param.h> |
34 | #include <sys/file.h> | |
f4d507d5 | 35 | #include <sys/mount.h> |
0ad19a3f | 36 | #include <sys/types.h> |
0ad19a3f | 37 | #include <sys/prctl.h> |
38 | #include <sys/wait.h> | |
0ad19a3f | 39 | |
b113348e | 40 | #include <lxc/lxc.h> |
0ad19a3f | 41 | |
42 | LXC_TTY_HANDLER(SIGINT); | |
43 | LXC_TTY_HANDLER(SIGQUIT); | |
44 | ||
f4d507d5 | 45 | int opentty(const char *ttyname) |
46 | { | |
47 | int i, fd, flags; | |
48 | ||
49 | fd = open(ttyname, O_RDWR | O_NONBLOCK); | |
50 | if (fd == -1) { | |
51 | lxc_log_syserror("open '%s'", ttyname); | |
52 | return -1; | |
53 | } | |
54 | ||
55 | flags = fcntl(fd, F_GETFL); | |
56 | flags &= ~O_NONBLOCK; | |
57 | fcntl(fd, F_SETFL, flags); | |
58 | ||
59 | for (i = 0; i < fd; i++) | |
60 | close(i); | |
61 | for (i = 0; i < 3; i++) | |
62 | if (fd != i) | |
63 | dup2(fd, i); | |
64 | if (fd >= 3) | |
65 | close(fd); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
0ad19a3f | 70 | int lxc_start(const char *name, int argc, char *argv[], |
71 | lxc_callback_t prestart, void *data) | |
72 | { | |
73 | char *init = NULL, *val = NULL; | |
f4d507d5 | 74 | char ttyname[MAXPATHLEN]; |
0ad19a3f | 75 | int fd, lock, sv[2], sync = 0, err = -1; |
76 | pid_t pid; | |
77 | int clone_flags; | |
f4d507d5 | 78 | |
0ad19a3f | 79 | lock = lxc_get_lock(name); |
80 | if (!lock) { | |
81 | lxc_log_error("'%s' is busy", name); | |
82 | return -1; | |
83 | } | |
84 | ||
85 | if (lock < 0) { | |
86 | lxc_log_error("failed to acquire lock on '%s':%s", | |
87 | name, strerror(-lock)); | |
88 | return -1; | |
89 | } | |
90 | ||
0ad19a3f | 91 | /* Begin the set the state to STARTING*/ |
92 | if (lxc_setstate(name, STARTING)) { | |
93 | lxc_log_error("failed to set state %s", lxc_state2str(STARTING)); | |
94 | goto out; | |
95 | } | |
96 | ||
f4d507d5 | 97 | if (readlink("/proc/self/fd/0", ttyname, sizeof(ttyname)) < 0) { |
98 | lxc_log_syserror("failed to read '/proc/self/fd/0'"); | |
99 | goto out; | |
100 | } | |
101 | ||
102 | ||
0ad19a3f | 103 | /* Synchro socketpair */ |
104 | if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv)) { | |
105 | lxc_log_syserror("failed to create communication socketpair"); | |
f4d507d5 | 106 | goto out; |
0ad19a3f | 107 | } |
108 | ||
109 | /* Avoid signals from terminal */ | |
110 | LXC_TTY_ADD_HANDLER(SIGINT); | |
111 | LXC_TTY_ADD_HANDLER(SIGQUIT); | |
112 | ||
f4d507d5 | 113 | clone_flags = CLONE_NEWPID|CLONE_NEWIPC|CLONE_NEWNS; |
0ad19a3f | 114 | if (conf_has_utsname(name)) |
115 | clone_flags |= CLONE_NEWUTS; | |
116 | if (conf_has_network(name)) | |
117 | clone_flags |= CLONE_NEWNET; | |
118 | ||
119 | /* Create a process in a new set of namespaces */ | |
120 | pid = fork_ns(clone_flags); | |
121 | if (pid < 0) { | |
122 | lxc_log_syserror("failed to fork into a new namespace"); | |
123 | goto err_fork_ns; | |
124 | } | |
125 | ||
126 | if (!pid) { | |
127 | ||
128 | close(sv[1]); | |
129 | ||
130 | /* Be sure we don't inherit this after the exec */ | |
131 | fcntl(sv[0], F_SETFD, FD_CLOEXEC); | |
132 | ||
133 | /* Tell our father he can begin to configure the container */ | |
134 | if (write(sv[0], &sync, sizeof(sync)) < 0) { | |
135 | lxc_log_syserror("failed to write socket"); | |
136 | return 1; | |
137 | } | |
138 | ||
139 | /* Wait for the father to finish the configuration */ | |
140 | if (read(sv[0], &sync, sizeof(sync)) < 0) { | |
141 | lxc_log_syserror("failed to read socket"); | |
142 | return 1; | |
143 | } | |
144 | ||
145 | /* Setup the container, ip, names, utsname, ... */ | |
146 | if (lxc_setup(name)) { | |
147 | lxc_log_error("failed to setup the container"); | |
148 | if (write(sv[0], &sync, sizeof(sync)) < 0) | |
149 | lxc_log_syserror("failed to write the socket"); | |
150 | return -1; | |
151 | } | |
152 | ||
f4d507d5 | 153 | /* Open the tty */ |
154 | if (opentty(ttyname)) { | |
155 | lxc_log_syserror("failed to open the tty"); | |
156 | return -1; | |
157 | } | |
158 | ||
159 | if (mount(ttyname, "/dev/console", "none", MS_BIND, 0)) { | |
160 | lxc_log_syserror("failed to mount '/dev/console'"); | |
161 | return -1; | |
162 | } | |
163 | ||
0ad19a3f | 164 | /* If a callback has been passed, call it before doing exec */ |
165 | if (prestart) | |
166 | if (prestart(name, argc, argv, data)) { | |
167 | lxc_log_error("prestart callback has failed"); | |
168 | return -1; | |
169 | } | |
170 | ||
171 | execvp(argv[0], argv); | |
172 | lxc_log_syserror("failed to exec %s", argv[0]); | |
173 | ||
174 | /* If the exec fails, tell that to our father */ | |
175 | if (write(sv[0], &sync, sizeof(sync)) < 0) | |
176 | lxc_log_syserror("failed to write the socket"); | |
177 | ||
178 | exit(1); | |
179 | } | |
180 | ||
181 | close(sv[0]); | |
182 | ||
183 | /* Wait for the child to be ready */ | |
184 | if (read(sv[1], &sync, sizeof(sync)) < 0) { | |
185 | lxc_log_syserror("failed to read the socket"); | |
186 | goto err_pipe_read; | |
187 | } | |
188 | ||
189 | /* Create the network configuration */ | |
190 | if (clone_flags & CLONE_NEWNET && conf_create_network(name, pid)) { | |
191 | lxc_log_error("failed to create the configured network"); | |
192 | goto err_create_network; | |
193 | } | |
194 | ||
195 | /* Tell the child to continue its initialization */ | |
196 | if (write(sv[1], &sync, sizeof(sync)) < 0) { | |
197 | lxc_log_syserror("failed to write the socket"); | |
198 | goto err_pipe_write; | |
199 | } | |
200 | ||
201 | /* Wait for the child to exec or returning an error */ | |
202 | err = read(sv[1], &sync, sizeof(sync)); | |
203 | if (err < 0) { | |
204 | lxc_log_error("failed to read the socket"); | |
205 | goto err_pipe_read2; | |
206 | } | |
207 | ||
208 | if (err > 0) { | |
209 | lxc_log_error("something went wrong with %d", pid); | |
210 | /* TODO : check status etc ... */ | |
211 | waitpid(pid, NULL, 0); | |
212 | goto err_child_failed; | |
213 | } | |
214 | ||
215 | asprintf(&val, "%d\n", pid); | |
216 | asprintf(&init, LXCPATH "/%s/init", name); | |
217 | fd = open(init, O_WRONLY|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR); | |
218 | if (fd < 0) { | |
219 | lxc_log_syserror("failed to open '%s'", init); | |
220 | goto err_write; | |
221 | } | |
222 | ||
223 | if (write(fd, val, strlen(val)) < 0) { | |
224 | lxc_log_syserror("failed to write the init pid"); | |
225 | goto err_write; | |
226 | } | |
227 | ||
228 | close(fd); | |
229 | ||
230 | if (lxc_link_nsgroup(name, pid)) | |
231 | lxc_log_warning("cgroupfs not found: cgroup disabled"); | |
232 | ||
233 | if (lxc_setstate(name, RUNNING)) { | |
234 | lxc_log_error("failed to set state to %s", | |
235 | lxc_state2str(RUNNING)); | |
236 | goto err_state_failed; | |
237 | } | |
238 | ||
239 | wait_again: | |
240 | if (waitpid(pid, NULL, 0) < 0) { | |
241 | if (errno == EINTR) | |
242 | goto wait_again; | |
243 | lxc_log_syserror("failed to wait the pid %d", pid); | |
244 | goto err_waitpid_failed; | |
245 | } | |
246 | ||
247 | if (lxc_setstate(name, STOPPING)) | |
248 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPING)); | |
249 | ||
250 | if (clone_flags & CLONE_NEWNET && conf_destroy_network(name)) | |
251 | lxc_log_error("failed to destroy the network"); | |
252 | ||
253 | err = 0; | |
254 | out: | |
255 | if (lxc_setstate(name, STOPPED)) | |
256 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPED)); | |
257 | ||
258 | lxc_unlink_nsgroup(name); | |
259 | unlink(init); | |
260 | free(init); | |
261 | free(val); | |
262 | lxc_put_lock(lock); | |
263 | ||
264 | return err; | |
265 | ||
266 | err_write: | |
267 | close(fd); | |
268 | ||
269 | err_state_failed: | |
270 | err_child_failed: | |
271 | err_pipe_read2: | |
272 | err_pipe_write: | |
273 | if (clone_flags & CLONE_NEWNET) | |
274 | conf_destroy_network(name); | |
275 | err_create_network: | |
276 | err_pipe_read: | |
277 | err_waitpid_failed: | |
278 | if (lxc_setstate(name, ABORTING)) | |
279 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPED)); | |
280 | ||
281 | kill(pid, SIGKILL); | |
282 | err_fork_ns: | |
283 | LXC_TTY_DEL_HANDLER(SIGQUIT); | |
284 | LXC_TTY_DEL_HANDLER(SIGINT); | |
285 | close(sv[0]); | |
286 | close(sv[1]); | |
287 | err: | |
288 | goto out; | |
289 | } |