]>
Commit | Line | Data |
---|---|---|
5e97c3fc | 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> | |
33 | #include <mntent.h> | |
34 | #include <sys/param.h> | |
35 | #include <sys/file.h> | |
36 | #include <sys/types.h> | |
37 | #include <sys/stat.h> | |
38 | #include <sys/prctl.h> | |
39 | #include <sys/wait.h> | |
40 | #include <netinet/in.h> | |
41 | #include <net/if.h> | |
42 | ||
43 | #include <lxc.h> | |
5e97c3fc | 44 | |
45 | LXC_TTY_HANDLER(SIGINT); | |
46 | LXC_TTY_HANDLER(SIGQUIT); | |
47 | ||
48 | int lxc_start(const char *name, int argc, char *argv[], | |
49 | lxc_callback_t prestart, void *data) | |
50 | { | |
51 | char *init = NULL, *val = NULL; | |
52 | int fd, lock, sv[2], sync = 0, err = -1; | |
53 | pid_t pid; | |
54 | int clone_flags; | |
55 | ||
56 | lock = lxc_get_lock(name); | |
57 | if (!lock) { | |
58 | lxc_log_error("'%s' is busy", name); | |
59 | return -1; | |
60 | } | |
61 | ||
62 | if (lock < 0) { | |
63 | lxc_log_error("failed to acquire lock on '%s':%s", | |
64 | name, strerror(-lock)); | |
65 | return -1; | |
66 | } | |
67 | ||
68 | fcntl(lock, F_SETFD, FD_CLOEXEC); | |
69 | ||
70 | /* Begin the set the state to STARTING*/ | |
71 | if (lxc_setstate(name, STARTING)) { | |
c2cc9f0a | 72 | lxc_log_error("failed to set state %s", lxc_state2str(STARTING)); |
5e97c3fc | 73 | goto out; |
74 | } | |
75 | ||
76 | /* Synchro socketpair */ | |
77 | if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv)) { | |
78 | lxc_log_syserror("failed to create communication socketpair"); | |
79 | goto err; | |
80 | } | |
81 | ||
82 | /* Avoid signals from terminal */ | |
83 | LXC_TTY_ADD_HANDLER(SIGINT); | |
84 | LXC_TTY_ADD_HANDLER(SIGQUIT); | |
85 | ||
86 | clone_flags = CLONE_NEWPID|CLONE_NEWIPC; | |
87 | if (conf_has_fstab(name)) | |
88 | clone_flags |= CLONE_NEWNS; | |
89 | if (conf_has_utsname(name)) | |
90 | clone_flags |= CLONE_NEWUTS; | |
91 | if (conf_has_network(name)) | |
92 | clone_flags |= CLONE_NEWNET; | |
93 | ||
94 | /* Create a process in a new set of namespaces */ | |
95 | pid = fork_ns(clone_flags); | |
96 | if (pid < 0) { | |
97 | lxc_log_syserror("failed to fork into a new namespace"); | |
98 | goto err_fork_ns; | |
99 | } | |
100 | ||
101 | if (!pid) { | |
102 | ||
103 | close(sv[1]); | |
104 | ||
105 | /* Be sure we don't inherit this after the exec */ | |
106 | fcntl(sv[0], F_SETFD, FD_CLOEXEC); | |
107 | ||
108 | /* Tell our father he can begin to configure the container */ | |
109 | if (write(sv[0], &sync, sizeof(sync)) < 0) { | |
110 | lxc_log_syserror("failed to write socket"); | |
111 | return 1; | |
112 | } | |
113 | ||
114 | /* Wait for the father to finish the configuration */ | |
115 | if (read(sv[0], &sync, sizeof(sync)) < 0) { | |
116 | lxc_log_syserror("failed to read socket"); | |
117 | return 1; | |
118 | } | |
119 | ||
120 | /* Setup the container, ip, names, utsname, ... */ | |
121 | if (lxc_setup(name)) { | |
122 | lxc_log_error("failed to setup the container"); | |
123 | if (write(sv[0], &sync, sizeof(sync)) < 0) | |
124 | lxc_log_syserror("failed to write the socket"); | |
125 | return -1; | |
126 | } | |
127 | ||
128 | /* If a callback has been passed, call it before doing exec */ | |
129 | if (prestart) | |
130 | if (prestart(name, argc, argv, data)) { | |
131 | lxc_log_error("prestart callback has failed"); | |
132 | return -1; | |
133 | } | |
134 | ||
135 | execvp(argv[0], argv); | |
136 | lxc_log_syserror("failed to exec %s", argv[0]); | |
137 | ||
138 | /* If the exec fails, tell that to our father */ | |
139 | if (write(sv[0], &sync, sizeof(sync)) < 0) | |
140 | lxc_log_syserror("failed to write the socket"); | |
141 | ||
142 | return 1; | |
143 | } | |
144 | ||
145 | close(sv[0]); | |
146 | ||
147 | /* Wait for the child to be ready */ | |
148 | if (read(sv[1], &sync, sizeof(sync)) < 0) { | |
149 | lxc_log_syserror("failed to read the socket"); | |
150 | goto err_pipe_read; | |
151 | } | |
152 | ||
153 | /* Create the network configuration */ | |
154 | if (clone_flags & CLONE_NEWNET && conf_create_network(name, pid)) { | |
155 | lxc_log_error("failed to create the configured network"); | |
156 | goto err_create_network; | |
157 | } | |
158 | ||
159 | /* Tell the child to continue its initialization */ | |
160 | if (write(sv[1], &sync, sizeof(sync)) < 0) { | |
161 | lxc_log_syserror("failed to write the socket"); | |
162 | goto err_pipe_write; | |
163 | } | |
164 | ||
165 | /* Wait for the child to exec or returning an error */ | |
166 | err = read(sv[1], &sync, sizeof(sync)); | |
167 | if (err < 0) { | |
168 | lxc_log_error("failed to read the socket"); | |
169 | goto err_pipe_read2; | |
170 | } | |
171 | ||
172 | if (err > 0) { | |
173 | lxc_log_error("something went wrong with %d", pid); | |
174 | /* TODO : check status etc ... */ | |
175 | waitpid(pid, NULL, 0); | |
176 | goto err_child_failed; | |
177 | } | |
178 | ||
179 | asprintf(&val, "%d\n", pid); | |
180 | asprintf(&init, LXCPATH "/%s/init", name); | |
181 | fd = open(init, O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR); | |
182 | if (fd < 0) { | |
183 | lxc_log_syserror("failed to open '%s'", init); | |
184 | goto err_write; | |
185 | } | |
186 | ||
187 | if (write(fd, val, strlen(val)) < 0) { | |
188 | lxc_log_syserror("failed to write the init pid"); | |
189 | goto err_write; | |
190 | } | |
191 | ||
192 | close(fd); | |
193 | ||
194 | if (lxc_link_nsgroup(name, pid)) | |
195 | lxc_log_warning("cgroupfs not found: cgroup disabled"); | |
196 | ||
197 | if (lxc_setstate(name, RUNNING)) { | |
c2cc9f0a | 198 | lxc_log_error("failed to set state to %s", lxc_state2str(RUNNING)); |
5e97c3fc | 199 | goto err_state_failed; |
200 | } | |
201 | ||
202 | wait_again: | |
203 | if (waitpid(pid, NULL, 0) < 0) { | |
204 | if (errno == EINTR) | |
205 | goto wait_again; | |
206 | lxc_log_syserror("failed to wait the pid %d", pid); | |
207 | goto err_waitpid_failed; | |
208 | } | |
209 | ||
210 | if (lxc_setstate(name, STOPPING)) | |
c2cc9f0a | 211 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPING)); |
5e97c3fc | 212 | |
213 | if (clone_flags & CLONE_NEWNET && conf_destroy_network(name)) | |
214 | lxc_log_error("failed to destroy the network"); | |
215 | ||
216 | err = 0; | |
217 | out: | |
218 | if (lxc_setstate(name, STOPPED)) | |
c2cc9f0a | 219 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPED)); |
5e97c3fc | 220 | |
221 | lxc_unlink_nsgroup(name); | |
222 | unlink(init); | |
223 | free(init); | |
224 | free(val); | |
225 | lxc_put_lock(lock); | |
226 | ||
227 | return err; | |
228 | ||
229 | err_write: | |
230 | close(fd); | |
231 | ||
232 | err_state_failed: | |
233 | err_child_failed: | |
234 | err_pipe_read2: | |
235 | err_pipe_write: | |
236 | if (clone_flags & CLONE_NEWNET) | |
237 | conf_destroy_network(name); | |
238 | err_create_network: | |
239 | err_pipe_read: | |
240 | err_waitpid_failed: | |
241 | if (lxc_setstate(name, ABORTING)) | |
c2cc9f0a | 242 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPED)); |
5e97c3fc | 243 | |
244 | kill(pid, SIGKILL); | |
245 | err_fork_ns: | |
246 | LXC_TTY_DEL_HANDLER(SIGQUIT); | |
247 | LXC_TTY_DEL_HANDLER(SIGINT); | |
248 | close(sv[0]); | |
249 | close(sv[1]); | |
250 | err: | |
251 | goto out; | |
252 | } |