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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> |
42ff343d | 38 | #include <sys/capability.h> |
0ad19a3f | 39 | #include <sys/wait.h> |
0ad19a3f | 40 | |
e2bcd7db | 41 | #include "error.h" |
42 | ||
b113348e | 43 | #include <lxc/lxc.h> |
0ad19a3f | 44 | |
45 | LXC_TTY_HANDLER(SIGINT); | |
46 | LXC_TTY_HANDLER(SIGQUIT); | |
47 | ||
05f05512 | 48 | int lxc_start(const char *name, char *argv[]) |
0ad19a3f | 49 | { |
22ebac19 | 50 | char init[MAXPATHLEN]; |
51 | char *val = NULL; | |
e2bcd7db | 52 | int fd, lock, sv[2], sync = 0, err = -LXC_ERROR_INTERNAL; |
0ad19a3f | 53 | pid_t pid; |
54 | int clone_flags; | |
f4d507d5 | 55 | |
0ad19a3f | 56 | lock = lxc_get_lock(name); |
e5bda9ee | 57 | if (lock < 0) { |
58 | if (lock == -EWOULDBLOCK) | |
59 | return -LXC_ERROR_BUSY; | |
60 | if (lock == -ENOENT) | |
61 | return -LXC_ERROR_NOT_FOUND; | |
62 | return -LXC_ERROR_LOCK; | |
63 | } | |
0ad19a3f | 64 | |
0ad19a3f | 65 | /* Begin the set the state to STARTING*/ |
66 | if (lxc_setstate(name, STARTING)) { | |
8b8b04f8 | 67 | lxc_log_error("failed to set state '%s'", |
68 | lxc_state2str(STARTING)); | |
0ad19a3f | 69 | goto out; |
70 | } | |
71 | ||
72 | /* Synchro socketpair */ | |
73 | if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv)) { | |
74 | lxc_log_syserror("failed to create communication socketpair"); | |
f4d507d5 | 75 | goto out; |
0ad19a3f | 76 | } |
77 | ||
78 | /* Avoid signals from terminal */ | |
79 | LXC_TTY_ADD_HANDLER(SIGINT); | |
80 | LXC_TTY_ADD_HANDLER(SIGQUIT); | |
81 | ||
f4d507d5 | 82 | clone_flags = CLONE_NEWPID|CLONE_NEWIPC|CLONE_NEWNS; |
0ad19a3f | 83 | if (conf_has_utsname(name)) |
84 | clone_flags |= CLONE_NEWUTS; | |
85 | if (conf_has_network(name)) | |
86 | clone_flags |= CLONE_NEWNET; | |
87 | ||
88 | /* Create a process in a new set of namespaces */ | |
89 | pid = fork_ns(clone_flags); | |
90 | if (pid < 0) { | |
91 | lxc_log_syserror("failed to fork into a new namespace"); | |
92 | goto err_fork_ns; | |
93 | } | |
94 | ||
95 | if (!pid) { | |
96 | ||
97 | close(sv[1]); | |
98 | ||
99 | /* Be sure we don't inherit this after the exec */ | |
100 | fcntl(sv[0], F_SETFD, FD_CLOEXEC); | |
101 | ||
102 | /* Tell our father he can begin to configure the container */ | |
103 | if (write(sv[0], &sync, sizeof(sync)) < 0) { | |
104 | lxc_log_syserror("failed to write socket"); | |
57545890 | 105 | goto out_child; |
0ad19a3f | 106 | } |
107 | ||
108 | /* Wait for the father to finish the configuration */ | |
109 | if (read(sv[0], &sync, sizeof(sync)) < 0) { | |
110 | lxc_log_syserror("failed to read socket"); | |
57545890 | 111 | goto out_child; |
0ad19a3f | 112 | } |
113 | ||
114 | /* Setup the container, ip, names, utsname, ... */ | |
e5bda9ee | 115 | err = lxc_setup(name); |
116 | if (err) { | |
0ad19a3f | 117 | lxc_log_error("failed to setup the container"); |
e5bda9ee | 118 | if (write(sv[0], &err, sizeof(err)) < 0) |
0ad19a3f | 119 | lxc_log_syserror("failed to write the socket"); |
57545890 | 120 | goto out_child; |
0ad19a3f | 121 | } |
122 | ||
42ff343d | 123 | if (prctl(PR_CAPBSET_DROP, CAP_SYS_BOOT, 0, 0, 0)) { |
124 | lxc_log_syserror("failed to remove CAP_SYS_BOOT capability"); | |
125 | goto out_child; | |
126 | } | |
127 | ||
0ad19a3f | 128 | execvp(argv[0], argv); |
129 | lxc_log_syserror("failed to exec %s", argv[0]); | |
130 | ||
131 | /* If the exec fails, tell that to our father */ | |
e5bda9ee | 132 | if (write(sv[0], &err, sizeof(err)) < 0) |
0ad19a3f | 133 | lxc_log_syserror("failed to write the socket"); |
134 | ||
57545890 | 135 | out_child: |
e5bda9ee | 136 | exit(err); |
0ad19a3f | 137 | } |
138 | ||
139 | close(sv[0]); | |
140 | ||
141 | /* Wait for the child to be ready */ | |
142 | if (read(sv[1], &sync, sizeof(sync)) < 0) { | |
143 | lxc_log_syserror("failed to read the socket"); | |
144 | goto err_pipe_read; | |
145 | } | |
146 | ||
218d4250 | 147 | if (lxc_link_nsgroup(name, pid)) |
148 | lxc_log_warning("cgroupfs not found: cgroup disabled"); | |
149 | ||
0ad19a3f | 150 | /* Create the network configuration */ |
151 | if (clone_flags & CLONE_NEWNET && conf_create_network(name, pid)) { | |
152 | lxc_log_error("failed to create the configured network"); | |
153 | goto err_create_network; | |
154 | } | |
155 | ||
156 | /* Tell the child to continue its initialization */ | |
157 | if (write(sv[1], &sync, sizeof(sync)) < 0) { | |
158 | lxc_log_syserror("failed to write the socket"); | |
159 | goto err_pipe_write; | |
160 | } | |
161 | ||
162 | /* Wait for the child to exec or returning an error */ | |
163 | err = read(sv[1], &sync, sizeof(sync)); | |
164 | if (err < 0) { | |
165 | lxc_log_error("failed to read the socket"); | |
166 | goto err_pipe_read2; | |
167 | } | |
168 | ||
169 | if (err > 0) { | |
e5bda9ee | 170 | err = sync; |
171 | printf("error value is %d\n", err); | |
0ad19a3f | 172 | /* TODO : check status etc ... */ |
173 | waitpid(pid, NULL, 0); | |
174 | goto err_child_failed; | |
175 | } | |
176 | ||
177 | asprintf(&val, "%d\n", pid); | |
22ebac19 | 178 | |
179 | snprintf(init, MAXPATHLEN, LXCPATH "/%s/init", name); | |
180 | ||
0ad19a3f | 181 | fd = open(init, O_WRONLY|O_CREAT|O_TRUNC, 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 | ||
0ad19a3f | 194 | if (lxc_setstate(name, RUNNING)) { |
195 | lxc_log_error("failed to set state to %s", | |
196 | lxc_state2str(RUNNING)); | |
197 | goto err_state_failed; | |
198 | } | |
199 | ||
200 | wait_again: | |
201 | if (waitpid(pid, NULL, 0) < 0) { | |
202 | if (errno == EINTR) | |
203 | goto wait_again; | |
204 | lxc_log_syserror("failed to wait the pid %d", pid); | |
205 | goto err_waitpid_failed; | |
206 | } | |
207 | ||
208 | if (lxc_setstate(name, STOPPING)) | |
209 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPING)); | |
210 | ||
b7c9b199 | 211 | #ifdef NETWORK_DESTROY |
0ad19a3f | 212 | if (clone_flags & CLONE_NEWNET && conf_destroy_network(name)) |
213 | lxc_log_error("failed to destroy the network"); | |
b7c9b199 | 214 | #endif |
0ad19a3f | 215 | |
216 | err = 0; | |
217 | out: | |
218 | if (lxc_setstate(name, STOPPED)) | |
219 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPED)); | |
220 | ||
221 | lxc_unlink_nsgroup(name); | |
222 | unlink(init); | |
0ad19a3f | 223 | free(val); |
224 | lxc_put_lock(lock); | |
536b97f0 | 225 | LXC_TTY_DEL_HANDLER(SIGQUIT); |
226 | LXC_TTY_DEL_HANDLER(SIGINT); | |
0ad19a3f | 227 | |
228 | return err; | |
229 | ||
230 | err_write: | |
231 | close(fd); | |
232 | ||
233 | err_state_failed: | |
234 | err_child_failed: | |
235 | err_pipe_read2: | |
236 | err_pipe_write: | |
b7c9b199 | 237 | #ifdef NETWORK_DESTROY |
0ad19a3f | 238 | if (clone_flags & CLONE_NEWNET) |
239 | conf_destroy_network(name); | |
b7c9b199 | 240 | #endif |
0ad19a3f | 241 | err_create_network: |
242 | err_pipe_read: | |
243 | err_waitpid_failed: | |
244 | if (lxc_setstate(name, ABORTING)) | |
245 | lxc_log_error("failed to set state %s", lxc_state2str(STOPPED)); | |
246 | ||
247 | kill(pid, SIGKILL); | |
248 | err_fork_ns: | |
0ad19a3f | 249 | close(sv[0]); |
250 | close(sv[1]); | |
0ad19a3f | 251 | goto out; |
252 | } |