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Commit | Line | Data |
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724e753c MN |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2009 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
724e753c MN |
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 | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
724e753c MN |
22 | */ |
23 | ||
fe84a562 CB |
24 | #include "config.h" |
25 | ||
cf685555 | 26 | #include <caps.h> |
724e753c | 27 | #include <errno.h> |
91480a0f | 28 | #include <fcntl.h> |
fe84a562 | 29 | #include <malloc.h> |
37515ebd | 30 | #include <poll.h> |
fe84a562 CB |
31 | #include <signal.h> |
32 | #include <stdio.h> | |
33 | #include <stdlib.h> | |
34 | #include <unistd.h> | |
35 | #include <sys/param.h> | |
724e753c MN |
36 | #include <sys/socket.h> |
37 | #include <sys/un.h> | |
724e753c | 38 | |
fe84a562 | 39 | #include "af_unix.h" |
f2363e38 | 40 | #include "cgroup.h" |
724e753c | 41 | #include "commands.h" |
bbf5cf35 | 42 | #include "commands_utils.h" |
fe84a562 | 43 | #include "conf.h" |
ef6e34ee | 44 | #include "confile.h" |
fe84a562 CB |
45 | #include "console.h" |
46 | #include "log.h" | |
47 | #include "lxc.h" | |
dbc9832d | 48 | #include "lxclock.h" |
724e753c | 49 | #include "mainloop.h" |
dbc9832d | 50 | #include "monitor.h" |
fe84a562 CB |
51 | #include "start.h" |
52 | #include "utils.h" | |
724e753c | 53 | |
ded1d23f | 54 | /* |
fe84a562 CB |
55 | * This file provides the different functions for clients to query/command the |
56 | * server. The client is typically some lxc tool and the server is typically the | |
57 | * container (ie. lxc-start). | |
ded1d23f | 58 | * |
fe84a562 CB |
59 | * Each command is transactional, the clients send a request to the server and |
60 | * the server answers the request with a message giving the request's status | |
61 | * (zero or a negative errno value). Both the request and response may contain | |
62 | * additional data. | |
ded1d23f | 63 | * |
fe84a562 CB |
64 | * Each command is wrapped in a ancillary message in order to pass a credential |
65 | * making possible to the server to check if the client is allowed to ask for | |
66 | * this command or not. | |
80bcb053 | 67 | * |
fe84a562 CB |
68 | * IMPORTANTLY: Note that semantics for current commands are fixed. If you wish |
69 | * to make any changes to how, say, LXC_CMD_GET_CONFIG_ITEM works by adding | |
70 | * information to the end of cmd.data, then you must introduce a new | |
71 | * LXC_CMD_GET_CONFIG_ITEM_V2 define with a new number. You may wish to also | |
72 | * mark LXC_CMD_GET_CONFIG_ITEM deprecated in commands.h. | |
80bcb053 SH |
73 | * |
74 | * This is necessary in order to avoid having a newly compiled lxc command | |
75 | * communicating with a running (old) monitor from crashing the running | |
76 | * container. | |
ded1d23f DL |
77 | */ |
78 | ||
724e753c MN |
79 | lxc_log_define(lxc_commands, lxc); |
80 | ||
ef6e34ee | 81 | static const char *lxc_cmd_str(lxc_cmd_t cmd) |
724e753c | 82 | { |
fe84a562 | 83 | static const char *const cmdname[LXC_CMD_MAX] = { |
54446942 | 84 | [LXC_CMD_CONSOLE] = "console", |
86a78f17 | 85 | [LXC_CMD_CONSOLE_WINCH] = "console_winch", |
54446942 CB |
86 | [LXC_CMD_STOP] = "stop", |
87 | [LXC_CMD_GET_STATE] = "get_state", | |
88 | [LXC_CMD_GET_INIT_PID] = "get_init_pid", | |
89 | [LXC_CMD_GET_CLONE_FLAGS] = "get_clone_flags", | |
90 | [LXC_CMD_GET_CGROUP] = "get_cgroup", | |
91 | [LXC_CMD_GET_CONFIG_ITEM] = "get_config_item", | |
92 | [LXC_CMD_GET_NAME] = "get_name", | |
93 | [LXC_CMD_GET_LXCPATH] = "get_lxcpath", | |
94 | [LXC_CMD_ADD_STATE_CLIENT] = "add_state_client", | |
0d9cd9c3 | 95 | [LXC_CMD_SET_CONFIG_ITEM] = "set_config_item", |
191d43cc | 96 | [LXC_CMD_CONSOLE_LOG] = "console_log", |
ef6e34ee | 97 | }; |
724e753c | 98 | |
f371aca9 | 99 | if (cmd >= LXC_CMD_MAX) |
ef6e34ee | 100 | return "Unknown cmd"; |
fe84a562 | 101 | |
ef6e34ee DE |
102 | return cmdname[cmd]; |
103 | } | |
104 | ||
105 | /* | |
106 | * lxc_cmd_rsp_recv: Receive a response to a command | |
107 | * | |
108 | * @sock : the socket connected to the container | |
109 | * @cmd : command to put response in | |
110 | * | |
111 | * Returns the size of the response message or < 0 on failure | |
112 | * | |
113 | * Note that if the command response datalen > 0, then data is | |
114 | * a malloc()ed buffer and should be free()ed by the caller. If | |
115 | * the response data is <= a void * worth of data, it will be | |
116 | * stored directly in data and datalen will be 0. | |
117 | * | |
118 | * As a special case, the response for LXC_CMD_CONSOLE is created | |
0115f8fd DE |
119 | * here as it contains an fd for the master pty passed through the |
120 | * unix socket. | |
ef6e34ee DE |
121 | */ |
122 | static int lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) | |
123 | { | |
2945ea97 | 124 | int ret, rspfd; |
ef6e34ee DE |
125 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
126 | ||
ae467c54 | 127 | ret = lxc_abstract_unix_recv_fds(sock, &rspfd, 1, rsp, sizeof(*rsp)); |
ef6e34ee | 128 | if (ret < 0) { |
fe84a562 CB |
129 | WARN("%s - Failed to receive response for command \"%s\"", |
130 | strerror(errno), lxc_cmd_str(cmd->req.cmd)); | |
6b7f85cb CB |
131 | if (errno == ECONNRESET) |
132 | return -ECONNRESET; | |
133 | ||
ef6e34ee DE |
134 | return -1; |
135 | } | |
fe84a562 | 136 | TRACE("Command \"%s\" received response", lxc_cmd_str(cmd->req.cmd)); |
ef6e34ee DE |
137 | |
138 | if (cmd->req.cmd == LXC_CMD_CONSOLE) { | |
139 | struct lxc_cmd_console_rsp_data *rspdata; | |
140 | ||
0115f8fd DE |
141 | /* recv() returns 0 bytes when a tty cannot be allocated, |
142 | * rsp->ret is < 0 when the peer permission check failed | |
143 | */ | |
144 | if (ret == 0 || rsp->ret < 0) | |
145 | return 0; | |
146 | ||
ef6e34ee DE |
147 | rspdata = malloc(sizeof(*rspdata)); |
148 | if (!rspdata) { | |
fe84a562 | 149 | ERROR("Failed to allocate response buffer for command \"%s\"", |
ef6e34ee | 150 | lxc_cmd_str(cmd->req.cmd)); |
fe84a562 | 151 | return -ENOMEM; |
ef6e34ee | 152 | } |
0115f8fd | 153 | rspdata->masterfd = rspfd; |
ef6e34ee DE |
154 | rspdata->ttynum = PTR_TO_INT(rsp->data); |
155 | rsp->data = rspdata; | |
156 | } | |
157 | ||
860e7c43 | 158 | if (rsp->datalen == 0) { |
fe84a562 | 159 | DEBUG("Response data length for command \"%s\" is 0", |
860e7c43 | 160 | lxc_cmd_str(cmd->req.cmd)); |
ae5c8b8e | 161 | return ret; |
860e7c43 | 162 | } |
fe84a562 | 163 | |
191d43cc CB |
164 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && |
165 | (cmd->req.cmd != LXC_CMD_CONSOLE_LOG)) { | |
ef6e34ee | 166 | errno = EFBIG; |
fe84a562 CB |
167 | ERROR("%s - Response data for command \"%s\" is too long: %d " |
168 | "bytes > %d", strerror(errno), lxc_cmd_str(cmd->req.cmd), | |
169 | rsp->datalen, LXC_CMD_DATA_MAX); | |
170 | return -EFBIG; | |
2ac9aafc | 171 | } |
ef6e34ee | 172 | |
191d43cc CB |
173 | if (cmd->req.cmd == LXC_CMD_CONSOLE_LOG) { |
174 | rsp->data = malloc(rsp->datalen + 1); | |
175 | ((char *)rsp->data)[rsp->datalen] = '\0'; | |
176 | } else { | |
177 | rsp->data = malloc(rsp->datalen); | |
178 | } | |
ef6e34ee | 179 | if (!rsp->data) { |
fe84a562 CB |
180 | errno = ENOMEM; |
181 | ERROR("%s - Failed to allocate response buffer for command " | |
182 | "\"%s\"", strerror(errno), lxc_cmd_str(cmd->req.cmd)); | |
183 | return -ENOMEM; | |
ef6e34ee | 184 | } |
fe84a562 | 185 | |
ef6e34ee DE |
186 | ret = recv(sock, rsp->data, rsp->datalen, 0); |
187 | if (ret != rsp->datalen) { | |
fe84a562 | 188 | ERROR("%s - Failed to receive response data for command \"%s\"", |
08aa08fe | 189 | lxc_cmd_str(cmd->req.cmd), strerror(errno)); |
ef6e34ee DE |
190 | if (ret >= 0) |
191 | ret = -1; | |
192 | } | |
724e753c MN |
193 | |
194 | return ret; | |
195 | } | |
196 | ||
ef6e34ee DE |
197 | /* |
198 | * lxc_cmd_rsp_send: Send a command response | |
199 | * | |
200 | * @fd : file descriptor of socket to send response on | |
201 | * @rsp : response to send | |
202 | * | |
203 | * Returns 0 on success, < 0 on failure | |
204 | */ | |
205 | static int lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) | |
206 | { | |
fe84a562 | 207 | ssize_t ret; |
ef6e34ee DE |
208 | |
209 | ret = send(fd, rsp, sizeof(*rsp), 0); | |
fe84a562 CB |
210 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) { |
211 | ERROR("%s - Failed to send command response %zd", | |
212 | strerror(errno), ret); | |
ef6e34ee DE |
213 | return -1; |
214 | } | |
215 | ||
fe84a562 CB |
216 | if (rsp->datalen <= 0) |
217 | return 0; | |
218 | ||
219 | ret = send(fd, rsp->data, rsp->datalen, 0); | |
220 | if (ret < 0 || ret != (ssize_t)rsp->datalen) { | |
221 | WARN("%s - Failed to send command response data %zd", | |
222 | strerror(errno), ret); | |
223 | return -1; | |
ef6e34ee | 224 | } |
fe84a562 | 225 | |
ef6e34ee DE |
226 | return 0; |
227 | } | |
228 | ||
c01c2be6 | 229 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 230 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 CB |
231 | { |
232 | int client_fd; | |
fe84a562 | 233 | ssize_t ret = -1; |
c01c2be6 | 234 | |
9dfa4041 | 235 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
fe84a562 CB |
236 | if (client_fd < 0) { |
237 | if (client_fd == -ECONNREFUSED) | |
238 | return -ECONNREFUSED; | |
c01c2be6 | 239 | |
fe84a562 CB |
240 | return -1; |
241 | } | |
c01c2be6 | 242 | |
fe84a562 CB |
243 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
244 | sizeof(cmd->req)); | |
245 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) { | |
c01c2be6 CB |
246 | close(client_fd); |
247 | ||
248 | if (errno == EPIPE) | |
249 | return -EPIPE; | |
250 | ||
251 | if (ret >= 0) | |
252 | return -EMSGSIZE; | |
253 | ||
254 | return -1; | |
255 | } | |
256 | ||
fe84a562 CB |
257 | if (cmd->req.datalen <= 0) |
258 | return client_fd; | |
c01c2be6 | 259 | |
fe84a562 CB |
260 | ret = send(client_fd, cmd->req.data, cmd->req.datalen, MSG_NOSIGNAL); |
261 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) { | |
262 | close(client_fd); | |
c01c2be6 | 263 | |
fe84a562 CB |
264 | if (errno == EPIPE) |
265 | return -EPIPE; | |
c01c2be6 | 266 | |
fe84a562 CB |
267 | if (ret >= 0) |
268 | return -EMSGSIZE; | |
c01c2be6 | 269 | |
fe84a562 | 270 | return -1; |
c01c2be6 CB |
271 | } |
272 | ||
273 | return client_fd; | |
274 | } | |
275 | ||
ef6e34ee DE |
276 | /* |
277 | * lxc_cmd: Connect to the specified running container, send it a command | |
278 | * request and collect the response | |
279 | * | |
280 | * @name : name of container to connect to | |
1e8cfdf6 | 281 | * @cmd : command with initialized request to send |
ef6e34ee DE |
282 | * @stopped : output indicator if the container was not running |
283 | * @lxcpath : the lxcpath in which the container is running | |
284 | * | |
285 | * Returns the size of the response message on success, < 0 on failure | |
286 | * | |
287 | * Note that there is a special case for LXC_CMD_CONSOLE. For this command | |
288 | * the fd cannot be closed because it is used as a placeholder to indicate | |
289 | * that a particular tty slot is in use. The fd is also used as a signal to | |
290 | * the container that when the caller dies or closes the fd, the container | |
0115f8fd DE |
291 | * will notice the fd on its side of the socket in its mainloop select and |
292 | * then free the slot with lxc_cmd_fd_cleanup(). The socket fd will be | |
293 | * returned in the cmd response structure. | |
ef6e34ee DE |
294 | */ |
295 | static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped, | |
88556fd7 | 296 | const char *lxcpath, const char *hashed_sock_name) |
724e753c | 297 | { |
fe84a562 CB |
298 | int client_fd; |
299 | int ret = -1; | |
dbc9832d CB |
300 | bool stay_connected = false; |
301 | ||
302 | if (cmd->req.cmd == LXC_CMD_CONSOLE || | |
54446942 | 303 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 304 | stay_connected = true; |
724e753c | 305 | |
0ecf64b5 SH |
306 | *stopped = 0; |
307 | ||
c01c2be6 CB |
308 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
309 | if (client_fd < 0) { | |
fe84a562 CB |
310 | TRACE("%s - Command \"%s\" failed to connect command socket", |
311 | strerror(errno), lxc_cmd_str(cmd->req.cmd)); | |
c01c2be6 | 312 | if (client_fd == -ECONNREFUSED) { |
ef6e34ee | 313 | *stopped = 1; |
c01c2be6 | 314 | return -1; |
3f903c04 CB |
315 | } |
316 | ||
c01c2be6 | 317 | if (client_fd == -EPIPE) |
6168ff15 | 318 | goto epipe; |
724e753c | 319 | |
c01c2be6 | 320 | goto out; |
724e753c MN |
321 | } |
322 | ||
c01c2be6 | 323 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
6b7f85cb CB |
324 | if (ret == -ECONNRESET) |
325 | *stopped = 1; | |
724e753c | 326 | out: |
4575a9f9 | 327 | if (!stay_connected || ret <= 0) |
c01c2be6 | 328 | close(client_fd); |
fe84a562 | 329 | |
0115f8fd | 330 | if (stay_connected && ret > 0) |
c01c2be6 | 331 | cmd->rsp.ret = client_fd; |
43eb6f29 | 332 | |
1362f2eb | 333 | return ret; |
6168ff15 SH |
334 | |
335 | epipe: | |
6168ff15 SH |
336 | *stopped = 1; |
337 | return 0; | |
724e753c MN |
338 | } |
339 | ||
b494d2dd SH |
340 | int lxc_try_cmd(const char *name, const char *lxcpath) |
341 | { | |
0ecf64b5 | 342 | int stopped, ret; |
b494d2dd SH |
343 | struct lxc_cmd_rr cmd = { |
344 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
345 | }; | |
346 | ||
88556fd7 | 347 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
348 | if (stopped) |
349 | return 0; | |
350 | if (ret > 0 && cmd.rsp.ret < 0) { | |
351 | errno = cmd.rsp.ret; | |
352 | return -1; | |
353 | } | |
354 | if (ret > 0) | |
355 | return 0; | |
356 | ||
fe84a562 CB |
357 | /* At this point we weren't denied access, and the container *was* |
358 | * started. There was some inexplicable error in the protocol. I'm not | |
359 | * clear on whether we should return -1 here, but we didn't receive a | |
360 | * -EACCES, so technically it's not that we're not allowed to control | |
361 | * the container - it's just not behaving. | |
b494d2dd SH |
362 | */ |
363 | return 0; | |
364 | } | |
365 | ||
ef6e34ee DE |
366 | /* Implentations of the commands and their callbacks */ |
367 | ||
368 | /* | |
369 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
370 | * | |
371 | * @name : name of container to connect to | |
372 | * @lxcpath : the lxcpath in which the container is running | |
373 | * | |
374 | * Returns the pid on success, < 0 on failure | |
375 | */ | |
376 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 377 | { |
0ecf64b5 | 378 | int ret, stopped; |
ef6e34ee DE |
379 | struct lxc_cmd_rr cmd = { |
380 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
381 | }; | |
382 | ||
88556fd7 | 383 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
384 | if (ret < 0) |
385 | return ret; | |
386 | ||
387 | return PTR_TO_INT(cmd.rsp.data); | |
43eb6f29 DL |
388 | } |
389 | ||
ef6e34ee DE |
390 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
391 | struct lxc_handler *handler) | |
43eb6f29 | 392 | { |
ef6e34ee DE |
393 | struct lxc_cmd_rsp rsp = { .data = INT_TO_PTR(handler->pid) }; |
394 | ||
395 | return lxc_cmd_rsp_send(fd, &rsp); | |
43eb6f29 DL |
396 | } |
397 | ||
ef6e34ee DE |
398 | /* |
399 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
400 | * | |
401 | * @name : name of container to connect to | |
402 | * @lxcpath : the lxcpath in which the container is running | |
403 | * | |
404 | * Returns the clone flags on success, < 0 on failure | |
405 | */ | |
406 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
407 | { | |
0ecf64b5 | 408 | int ret, stopped; |
ef6e34ee DE |
409 | struct lxc_cmd_rr cmd = { |
410 | .req = { .cmd = LXC_CMD_GET_CLONE_FLAGS }, | |
411 | }; | |
412 | ||
88556fd7 | 413 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
414 | if (ret < 0) |
415 | return ret; | |
43eb6f29 | 416 | |
ef6e34ee DE |
417 | return PTR_TO_INT(cmd.rsp.data); |
418 | } | |
419 | ||
420 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
421 | struct lxc_handler *handler) | |
26b2d152 | 422 | { |
ef6e34ee DE |
423 | struct lxc_cmd_rsp rsp = { .data = INT_TO_PTR(handler->clone_flags) }; |
424 | ||
425 | return lxc_cmd_rsp_send(fd, &rsp); | |
426 | } | |
427 | ||
428 | /* | |
429 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
430 | * particular subsystem. This is the cgroup path relative to the root | |
431 | * of the cgroup filesystem. | |
432 | * | |
ef6e34ee DE |
433 | * @name : name of container to connect to |
434 | * @lxcpath : the lxcpath in which the container is running | |
b98f7d6e | 435 | * @subsystem : the subsystem being asked about |
ef6e34ee DE |
436 | * |
437 | * Returns the path on success, NULL on failure. The caller must free() the | |
438 | * returned path. | |
439 | */ | |
b98f7d6e | 440 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, |
fe84a562 | 441 | const char *subsystem) |
ef6e34ee | 442 | { |
0ecf64b5 | 443 | int ret, stopped; |
ef6e34ee | 444 | struct lxc_cmd_rr cmd = { |
b98f7d6e SH |
445 | .req = { |
446 | .cmd = LXC_CMD_GET_CGROUP, | |
fe84a562 | 447 | .datalen = strlen(subsystem) + 1, |
b98f7d6e SH |
448 | .data = subsystem, |
449 | }, | |
26b2d152 MN |
450 | }; |
451 | ||
88556fd7 | 452 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 453 | if (ret < 0) |
ef6e34ee DE |
454 | return NULL; |
455 | ||
fe84a562 | 456 | if (ret == 0) |
ef6e34ee | 457 | return NULL; |
ef6e34ee | 458 | |
fe84a562 | 459 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 460 | return NULL; |
3f903c04 | 461 | |
ef6e34ee DE |
462 | return cmd.rsp.data; |
463 | } | |
464 | ||
465 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
466 | struct lxc_handler *handler) | |
467 | { | |
4fb3cba5 | 468 | const char *path; |
fe84a562 | 469 | struct lxc_cmd_rsp rsp; |
b98f7d6e SH |
470 | |
471 | if (req->datalen < 1) | |
472 | return -1; | |
8900b9eb | 473 | |
d4ef7c50 | 474 | path = cgroup_get_cgroup(handler, req->data); |
b98f7d6e SH |
475 | if (!path) |
476 | return -1; | |
fe84a562 | 477 | |
4f17323e | 478 | rsp.ret = 0; |
fe84a562 CB |
479 | rsp.datalen = strlen(path) + 1; |
480 | rsp.data = (char *)path; | |
ef6e34ee DE |
481 | |
482 | return lxc_cmd_rsp_send(fd, &rsp); | |
483 | } | |
484 | ||
485 | /* | |
486 | * lxc_cmd_get_config_item: Get config item the running container | |
487 | * | |
488 | * @name : name of container to connect to | |
7fa3f2e9 | 489 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
490 | * @lxcpath : the lxcpath in which the container is running |
491 | * | |
492 | * Returns the item on success, NULL on failure. The caller must free() the | |
493 | * returned item. | |
494 | */ | |
495 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
496 | const char *lxcpath) | |
497 | { | |
0ecf64b5 | 498 | int ret, stopped; |
ef6e34ee DE |
499 | struct lxc_cmd_rr cmd = { |
500 | .req = { .cmd = LXC_CMD_GET_CONFIG_ITEM, | |
501 | .data = item, | |
fe84a562 | 502 | .datalen = strlen(item) + 1, |
ef6e34ee DE |
503 | }, |
504 | }; | |
505 | ||
88556fd7 | 506 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
507 | if (ret < 0) |
508 | return NULL; | |
509 | ||
510 | if (cmd.rsp.ret == 0) | |
511 | return cmd.rsp.data; | |
fe84a562 | 512 | |
ef6e34ee DE |
513 | return NULL; |
514 | } | |
515 | ||
516 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
517 | struct lxc_handler *handler) | |
518 | { | |
519 | int cilen; | |
ef6e34ee | 520 | char *cidata; |
30aec088 | 521 | struct lxc_config_t *item; |
fe84a562 | 522 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
523 | |
524 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 525 | item = lxc_get_config(req->data); |
30aec088 CB |
526 | if (!item) |
527 | goto err1; | |
fe84a562 | 528 | |
cccd2219 | 529 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
530 | if (cilen <= 0) |
531 | goto err1; | |
532 | ||
533 | cidata = alloca(cilen + 1); | |
cccd2219 | 534 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 535 | goto err1; |
fe84a562 | 536 | |
ef6e34ee DE |
537 | cidata[cilen] = '\0'; |
538 | rsp.data = cidata; | |
539 | rsp.datalen = cilen + 1; | |
540 | rsp.ret = 0; | |
541 | goto out; | |
542 | ||
543 | err1: | |
544 | rsp.ret = -1; | |
545 | out: | |
546 | return lxc_cmd_rsp_send(fd, &rsp); | |
547 | } | |
548 | ||
0d9cd9c3 CB |
549 | /* |
550 | * lxc_cmd_set_config_item: Get config item the running container | |
551 | * | |
552 | * @name : name of container to connect to | |
553 | * @item : the configuration item to set (ex: lxc.net.0.veth.pair) | |
554 | * @value : the value to set (ex: "eth0") | |
555 | * @lxcpath : the lxcpath in which the container is running | |
556 | * | |
557 | * Returns 0 on success, negative errno on failure. | |
558 | */ | |
559 | int lxc_cmd_set_config_item(const char *name, const char *item, | |
560 | const char *value, const char *lxcpath) | |
561 | { | |
562 | int ret, stopped; | |
563 | struct lxc_cmd_set_config_item_req_data data; | |
564 | struct lxc_cmd_rr cmd; | |
565 | ||
566 | /* pre-validate request | |
567 | Currently we only support live-patching network configurations. | |
568 | */ | |
569 | if (strncmp(item, "lxc.net.", 8)) | |
570 | return -EINVAL; | |
571 | ||
572 | data.item = item; | |
573 | data.value = (void *)value; | |
574 | ||
575 | cmd.req.cmd = LXC_CMD_SET_CONFIG_ITEM; | |
576 | cmd.req.data = &data; | |
577 | cmd.req.datalen = sizeof(data); | |
578 | ||
579 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
580 | if (ret < 0) | |
581 | return ret; | |
582 | ||
583 | return cmd.rsp.ret; | |
584 | } | |
585 | ||
586 | static int lxc_cmd_set_config_item_callback(int fd, struct lxc_cmd_req *req, | |
587 | struct lxc_handler *handler) | |
588 | { | |
589 | const char *key, *value; | |
590 | struct lxc_cmd_rsp rsp; | |
591 | const struct lxc_cmd_set_config_item_req_data *data; | |
592 | ||
593 | data = req->data; | |
594 | key = data->item; | |
595 | value = data->value; | |
596 | ||
597 | memset(&rsp, 0, sizeof(rsp)); | |
598 | rsp.ret = lxc_set_config_item_locked(handler->conf, key, value); | |
fe84a562 | 599 | |
0d9cd9c3 CB |
600 | return lxc_cmd_rsp_send(fd, &rsp); |
601 | } | |
602 | ||
ef6e34ee DE |
603 | /* |
604 | * lxc_cmd_get_state: Get current state of the container | |
605 | * | |
606 | * @name : name of container to connect to | |
607 | * @lxcpath : the lxcpath in which the container is running | |
608 | * | |
609 | * Returns the state on success, < 0 on failure | |
610 | */ | |
dbc9832d | 611 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 612 | { |
0ecf64b5 | 613 | int ret, stopped; |
ef6e34ee DE |
614 | struct lxc_cmd_rr cmd = { |
615 | .req = { .cmd = LXC_CMD_GET_STATE } | |
616 | }; | |
26b2d152 | 617 | |
88556fd7 | 618 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 619 | if (ret < 0 && stopped) |
ef6e34ee DE |
620 | return STOPPED; |
621 | ||
622 | if (ret < 0) | |
26b2d152 | 623 | return -1; |
26b2d152 | 624 | |
ef6e34ee | 625 | if (!ret) { |
fe84a562 | 626 | WARN("Container \"%s\" has stopped before sending its state", name); |
ef6e34ee DE |
627 | return -1; |
628 | } | |
629 | ||
fe84a562 | 630 | DEBUG("Container \"%s\" is in \"%s\" state", name, |
ef6e34ee | 631 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); |
fe84a562 | 632 | |
ef6e34ee DE |
633 | return PTR_TO_INT(cmd.rsp.data); |
634 | } | |
635 | ||
636 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
637 | struct lxc_handler *handler) | |
638 | { | |
639 | struct lxc_cmd_rsp rsp = { .data = INT_TO_PTR(handler->state) }; | |
640 | ||
641 | return lxc_cmd_rsp_send(fd, &rsp); | |
642 | } | |
643 | ||
644 | /* | |
645 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
646 | * the processes running inside this container will be killed. | |
647 | * | |
648 | * @name : name of container to connect to | |
649 | * @lxcpath : the lxcpath in which the container is running | |
650 | * | |
651 | * Returns 0 on success, < 0 on failure | |
652 | */ | |
653 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
654 | { | |
0ecf64b5 | 655 | int ret, stopped; |
ef6e34ee DE |
656 | struct lxc_cmd_rr cmd = { |
657 | .req = { .cmd = LXC_CMD_STOP }, | |
658 | }; | |
659 | ||
88556fd7 | 660 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 661 | if (ret < 0) { |
ef6e34ee | 662 | if (stopped) { |
fe84a562 | 663 | INFO("Container \"%s\" is already stopped", name); |
ef6e34ee DE |
664 | return 0; |
665 | } | |
fe84a562 | 666 | |
26b2d152 MN |
667 | return -1; |
668 | } | |
669 | ||
fe84a562 CB |
670 | /* We do not expect any answer, because we wait for the connection to be |
671 | * closed. | |
95d5b147 SH |
672 | */ |
673 | if (ret > 0) { | |
fe84a562 CB |
674 | ERROR("%s - Failed to stop container \"%s\"", |
675 | strerror(-cmd.rsp.ret), name); | |
26b2d152 MN |
676 | return -1; |
677 | } | |
678 | ||
fe84a562 | 679 | INFO("Container \"%s\" has stopped", name); |
ef6e34ee | 680 | return 0; |
26b2d152 MN |
681 | } |
682 | ||
ef6e34ee DE |
683 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
684 | struct lxc_handler *handler) | |
d5088cf2 | 685 | { |
ef6e34ee | 686 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
687 | int stopsignal = SIGKILL; |
688 | ||
689 | if (handler->conf->stopsignal) | |
690 | stopsignal = handler->conf->stopsignal; | |
691 | memset(&rsp, 0, sizeof(rsp)); | |
692 | rsp.ret = kill(handler->pid, stopsignal); | |
693 | if (!rsp.ret) { | |
fe84a562 | 694 | /* We can't just use lxc_unfreeze() since we are already in the |
4fb3cba5 DE |
695 | * context of handling the STOP cmd in lxc-start, and calling |
696 | * lxc_unfreeze() would do another cmd (GET_CGROUP) which would | |
fe84a562 | 697 | * deadlock us. |
4fb3cba5 DE |
698 | */ |
699 | if (cgroup_unfreeze(handler)) | |
95d5b147 | 700 | return 0; |
fe84a562 CB |
701 | |
702 | ERROR("Failed to unfreeze container \"%s\"", handler->name); | |
ecfcb3f0 | 703 | rsp.ret = -1; |
ef6e34ee DE |
704 | } |
705 | ||
706 | return lxc_cmd_rsp_send(fd, &rsp); | |
707 | } | |
d5088cf2 | 708 | |
b5159817 DE |
709 | /* |
710 | * lxc_cmd_console_winch: To process as if a SIGWINCH were received | |
711 | * | |
712 | * @name : name of container to connect to | |
713 | * @lxcpath : the lxcpath in which the container is running | |
714 | * | |
715 | * Returns 0 on success, < 0 on failure | |
716 | */ | |
717 | int lxc_cmd_console_winch(const char *name, const char *lxcpath) | |
718 | { | |
0ecf64b5 | 719 | int ret, stopped; |
b5159817 DE |
720 | struct lxc_cmd_rr cmd = { |
721 | .req = { .cmd = LXC_CMD_CONSOLE_WINCH }, | |
722 | }; | |
723 | ||
88556fd7 | 724 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b5159817 DE |
725 | if (ret < 0) |
726 | return ret; | |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | static int lxc_cmd_console_winch_callback(int fd, struct lxc_cmd_req *req, | |
732 | struct lxc_handler *handler) | |
733 | { | |
734 | struct lxc_cmd_rsp rsp = { .data = 0 }; | |
735 | ||
736 | lxc_console_sigwinch(SIGWINCH); | |
fe84a562 | 737 | |
b5159817 DE |
738 | return lxc_cmd_rsp_send(fd, &rsp); |
739 | } | |
740 | ||
ef6e34ee DE |
741 | /* |
742 | * lxc_cmd_console: Open an fd to a tty in the container | |
743 | * | |
744 | * @name : name of container to connect to | |
745 | * @ttynum : in: the tty to open or -1 for next available | |
746 | * : out: the tty allocated | |
747 | * @fd : out: file descriptor for master side of pty | |
748 | * @lxcpath : the lxcpath in which the container is running | |
749 | * | |
0115f8fd | 750 | * Returns fd holding tty allocated on success, < 0 on failure |
ef6e34ee DE |
751 | */ |
752 | int lxc_cmd_console(const char *name, int *ttynum, int *fd, const char *lxcpath) | |
753 | { | |
0ecf64b5 | 754 | int ret, stopped; |
ef6e34ee DE |
755 | struct lxc_cmd_console_rsp_data *rspdata; |
756 | struct lxc_cmd_rr cmd = { | |
757 | .req = { .cmd = LXC_CMD_CONSOLE, .data = INT_TO_PTR(*ttynum) }, | |
758 | }; | |
d5088cf2 | 759 | |
88556fd7 | 760 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
761 | if (ret < 0) |
762 | return ret; | |
0115f8fd DE |
763 | |
764 | if (cmd.rsp.ret < 0) { | |
fe84a562 | 765 | ERROR("%s - Denied access to tty", strerror(-cmd.rsp.ret)); |
ef6e34ee DE |
766 | ret = -1; |
767 | goto out; | |
768 | } | |
d5088cf2 | 769 | |
0115f8fd | 770 | if (ret == 0) { |
fe84a562 | 771 | ERROR("tty number %d invalid, busy or all ttys busy", *ttynum); |
0115f8fd | 772 | ret = -1; |
ef6e34ee DE |
773 | goto out; |
774 | } | |
ef6e34ee DE |
775 | |
776 | rspdata = cmd.rsp.data; | |
0115f8fd | 777 | if (rspdata->masterfd < 0) { |
fe84a562 | 778 | ERROR("Unable to allocate fd for tty %d", rspdata->ttynum); |
ef6e34ee DE |
779 | goto out; |
780 | } | |
781 | ||
fe84a562 | 782 | ret = cmd.rsp.ret; /* socket fd */ |
0115f8fd | 783 | *fd = rspdata->masterfd; |
ef6e34ee | 784 | *ttynum = rspdata->ttynum; |
fe84a562 CB |
785 | INFO("Alloced fd %d for tty %d via socket %d", *fd, rspdata->ttynum, ret); |
786 | ||
ef6e34ee DE |
787 | out: |
788 | free(cmd.rsp.data); | |
789 | return ret; | |
790 | } | |
791 | ||
792 | static int lxc_cmd_console_callback(int fd, struct lxc_cmd_req *req, | |
793 | struct lxc_handler *handler) | |
794 | { | |
fe84a562 | 795 | int masterfd, ret; |
ef6e34ee | 796 | struct lxc_cmd_rsp rsp; |
fe84a562 | 797 | int ttynum = PTR_TO_INT(req->data); |
ef6e34ee | 798 | |
b5159817 DE |
799 | masterfd = lxc_console_allocate(handler->conf, fd, &ttynum); |
800 | if (masterfd < 0) | |
ef6e34ee DE |
801 | goto out_close; |
802 | ||
ef6e34ee DE |
803 | memset(&rsp, 0, sizeof(rsp)); |
804 | rsp.data = INT_TO_PTR(ttynum); | |
fe84a562 CB |
805 | ret = lxc_abstract_unix_send_fds(fd, &masterfd, 1, &rsp, sizeof(rsp)); |
806 | if (ret < 0) { | |
807 | ERROR("Failed to send tty to client"); | |
b5159817 | 808 | lxc_console_free(handler->conf, fd); |
ef6e34ee DE |
809 | goto out_close; |
810 | } | |
811 | ||
ef6e34ee DE |
812 | return 0; |
813 | ||
814 | out_close: | |
fe84a562 CB |
815 | /* Special indicator to lxc_cmd_handler() to close the fd and do |
816 | * related cleanup. | |
ef6e34ee DE |
817 | */ |
818 | return 1; | |
d5088cf2 CS |
819 | } |
820 | ||
88556fd7 ÇO |
821 | /* |
822 | * lxc_cmd_get_name: Returns the name of the container | |
823 | * | |
824 | * @hashed_sock_name: hashed socket name | |
825 | * | |
826 | * Returns the name on success, NULL on failure. | |
827 | */ | |
828 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
829 | { | |
830 | int ret, stopped; | |
831 | struct lxc_cmd_rr cmd = { | |
832 | .req = { .cmd = LXC_CMD_GET_NAME}, | |
833 | }; | |
834 | ||
835 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 836 | if (ret < 0) |
88556fd7 | 837 | return NULL; |
88556fd7 ÇO |
838 | |
839 | if (cmd.rsp.ret == 0) | |
840 | return cmd.rsp.data; | |
fe84a562 | 841 | |
88556fd7 ÇO |
842 | return NULL; |
843 | } | |
844 | ||
845 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
fe84a562 | 846 | struct lxc_handler *handler) |
88556fd7 ÇO |
847 | { |
848 | struct lxc_cmd_rsp rsp; | |
849 | ||
850 | memset(&rsp, 0, sizeof(rsp)); | |
851 | ||
f0ecc19d | 852 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
853 | rsp.datalen = strlen(handler->name) + 1; |
854 | rsp.ret = 0; | |
855 | ||
856 | return lxc_cmd_rsp_send(fd, &rsp); | |
857 | } | |
858 | ||
859 | /* | |
860 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
861 | * | |
862 | * @hashed_sock_name: hashed socket name | |
863 | * | |
864 | * Returns the lxcpath on success, NULL on failure. | |
865 | */ | |
866 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
867 | { | |
868 | int ret, stopped; | |
869 | struct lxc_cmd_rr cmd = { | |
870 | .req = { .cmd = LXC_CMD_GET_LXCPATH}, | |
871 | }; | |
724e753c | 872 | |
88556fd7 | 873 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 874 | if (ret < 0) |
88556fd7 | 875 | return NULL; |
88556fd7 ÇO |
876 | |
877 | if (cmd.rsp.ret == 0) | |
878 | return cmd.rsp.data; | |
fe84a562 | 879 | |
88556fd7 ÇO |
880 | return NULL; |
881 | } | |
882 | ||
883 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
884 | struct lxc_handler *handler) | |
885 | { | |
886 | struct lxc_cmd_rsp rsp; | |
887 | ||
888 | memset(&rsp, 0, sizeof(rsp)); | |
889 | ||
fe84a562 | 890 | rsp.ret = 0; |
88556fd7 ÇO |
891 | rsp.data = (char *)handler->lxcpath; |
892 | rsp.datalen = strlen(handler->lxcpath) + 1; | |
88556fd7 ÇO |
893 | |
894 | return lxc_cmd_rsp_send(fd, &rsp); | |
895 | } | |
ef6e34ee | 896 | |
54446942 | 897 | int lxc_cmd_add_state_client(const char *name, const char *lxcpath, |
92e35018 CB |
898 | lxc_state_t states[MAX_STATE], |
899 | int *state_client_fd) | |
dbc9832d | 900 | { |
bc631984 | 901 | int state, stopped; |
dbc9832d | 902 | ssize_t ret; |
dbc9832d CB |
903 | struct lxc_cmd_rr cmd = { |
904 | .req = { | |
54446942 | 905 | .cmd = LXC_CMD_ADD_STATE_CLIENT, |
dbc9832d CB |
906 | .data = states, |
907 | .datalen = (sizeof(lxc_state_t) * MAX_STATE) | |
908 | }, | |
909 | }; | |
910 | ||
dbc9832d | 911 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
912 | if (states[STOPPED] != 0 && stopped != 0) |
913 | return STOPPED; | |
914 | ||
dbc9832d | 915 | if (ret < 0) { |
fe84a562 | 916 | ERROR("%s - Failed to execute command", strerror(errno)); |
dbc9832d CB |
917 | return -1; |
918 | } | |
fe84a562 | 919 | |
dbc9832d CB |
920 | /* We should now be guaranteed to get an answer from the state sending |
921 | * function. | |
922 | */ | |
dbc9832d | 923 | if (cmd.rsp.ret < 0) { |
bc631984 | 924 | ERROR("%s - Failed to receive socket fd", strerror(-cmd.rsp.ret)); |
dbc9832d CB |
925 | return -1; |
926 | } | |
927 | ||
bc631984 CB |
928 | state = PTR_TO_INT(cmd.rsp.data); |
929 | if (state < MAX_STATE) { | |
44552fb2 CB |
930 | TRACE("Container is already in requested state %s", lxc_state2str(state)); |
931 | close(cmd.rsp.ret); | |
bc631984 CB |
932 | return state; |
933 | } | |
934 | ||
92e35018 | 935 | *state_client_fd = cmd.rsp.ret; |
bc631984 | 936 | TRACE("Added state client %d to state client list", cmd.rsp.ret); |
92e35018 | 937 | return MAX_STATE; |
dbc9832d CB |
938 | } |
939 | ||
54446942 CB |
940 | static int lxc_cmd_add_state_client_callback(int fd, struct lxc_cmd_req *req, |
941 | struct lxc_handler *handler) | |
dbc9832d | 942 | { |
44552fb2 | 943 | int ret; |
dbc9832d | 944 | struct lxc_cmd_rsp rsp = {0}; |
dbc9832d | 945 | |
fe84a562 | 946 | if (req->datalen < 0) |
44552fb2 | 947 | goto reap_client_fd; |
dbc9832d | 948 | |
fe84a562 | 949 | if (req->datalen > (sizeof(lxc_state_t) * MAX_STATE)) |
44552fb2 | 950 | goto reap_client_fd; |
dbc9832d | 951 | |
fe84a562 | 952 | if (!req->data) |
44552fb2 | 953 | goto reap_client_fd; |
dbc9832d | 954 | |
c01c2be6 | 955 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 CB |
956 | if (rsp.ret < 0) |
957 | goto reap_client_fd; | |
958 | ||
bc631984 | 959 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 960 | |
44552fb2 CB |
961 | ret = lxc_cmd_rsp_send(fd, &rsp); |
962 | if (ret < 0) | |
963 | goto reap_client_fd; | |
964 | ||
965 | return 0; | |
966 | ||
967 | reap_client_fd: | |
968 | /* Special indicator to lxc_cmd_handler() to close the fd and do related | |
969 | * cleanup. | |
970 | */ | |
971 | return 1; | |
dbc9832d CB |
972 | } |
973 | ||
191d43cc CB |
974 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
975 | struct lxc_console_log *log) | |
976 | { | |
977 | int ret, stopped; | |
978 | struct lxc_cmd_console_log data; | |
979 | struct lxc_cmd_rr cmd; | |
980 | ||
981 | data.clear = log->clear; | |
982 | data.read = log->read; | |
983 | data.read_max = *log->read_max; | |
63b74cda | 984 | data.write_logfile = log->write_logfile; |
191d43cc CB |
985 | |
986 | cmd.req.cmd = LXC_CMD_CONSOLE_LOG; | |
987 | cmd.req.data = &data; | |
988 | cmd.req.datalen = sizeof(struct lxc_cmd_console_log); | |
989 | ||
990 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
991 | if (ret < 0) | |
992 | return ret; | |
993 | ||
994 | /* There is nothing to be read from the buffer. So clear any values we | |
995 | * where passed to clearly indicate to the user that nothing went wrong. | |
996 | */ | |
63b74cda | 997 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
998 | *log->read_max = 0; |
999 | log->data = NULL; | |
1000 | } | |
1001 | ||
1002 | /* This is a proper error so don't touch any values we were passed. */ | |
1003 | if (cmd.rsp.ret < 0) | |
1004 | return cmd.rsp.ret; | |
1005 | ||
1006 | *log->read_max = cmd.rsp.datalen; | |
1007 | log->data = cmd.rsp.data; | |
1008 | ||
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
1013 | struct lxc_handler *handler) | |
1014 | { | |
1015 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 1016 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc | 1017 | const struct lxc_cmd_console_log *log = req->data; |
63b74cda | 1018 | struct lxc_console *console = &handler->conf->console; |
191d43cc CB |
1019 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; |
1020 | ||
1021 | rsp.ret = -EFAULT; | |
1022 | rsp.datalen = 0; | |
1023 | rsp.data = NULL; | |
28f3b1cd | 1024 | if (buffer_size <= 0) |
191d43cc CB |
1025 | goto out; |
1026 | ||
5928191e CB |
1027 | if (log->read || log->write_logfile) |
1028 | rsp.datalen = lxc_ringbuf_used(buf); | |
1029 | ||
191d43cc CB |
1030 | if (log->read) |
1031 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
1032 | ||
1033 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
1034 | rsp.datalen = log->read_max; | |
1035 | ||
1036 | /* there's nothing to read */ | |
63b74cda | 1037 | rsp.ret = -ENODATA; |
191d43cc | 1038 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
1039 | goto out; |
1040 | ||
1041 | if (log->write_logfile && rsp.datalen > 0) { | |
1042 | rsp.ret = -ENOENT; | |
3a784510 | 1043 | if (!console->buffer_log_file) |
63b74cda CB |
1044 | goto out; |
1045 | ||
1046 | rsp.ret = lxc_console_write_ringbuffer(console); | |
1047 | if (rsp.ret < 0) | |
1048 | goto out; | |
1049 | } | |
1050 | ||
1051 | rsp.ret = 0; | |
cf685555 | 1052 | if (log->clear) { |
966b9ecd CB |
1053 | int ret; |
1054 | size_t len; | |
1055 | char *tmp; | |
1056 | ||
cf685555 | 1057 | /* clear the ringbuffer */ |
191d43cc | 1058 | lxc_ringbuf_clear(buf); |
cf685555 CB |
1059 | |
1060 | /* truncate the ringbuffer log file */ | |
1061 | if (console->buffer_log_file) { | |
1062 | rsp.ret = -ENOENT; | |
1063 | if (!file_exists(console->buffer_log_file)) | |
1064 | goto out; | |
1065 | ||
1066 | /* be very certain things are kosher */ | |
1067 | rsp.ret = -EBADF; | |
1068 | if (console->buffer_log_file_fd < 0) | |
1069 | goto out; | |
1070 | ||
1071 | rsp.ret = lxc_unpriv(ftruncate(console->buffer_log_file_fd, 0)); | |
1072 | if (rsp.ret < 0) { | |
1073 | ERROR("%s - Failed to truncate console " | |
1074 | "ringbuffer log file \"%s\"", | |
1075 | strerror(errno), console->buffer_log_file); | |
1076 | goto out; | |
1077 | } | |
1078 | } | |
966b9ecd CB |
1079 | |
1080 | /* rotate the console log file */ | |
1081 | if (!console->log_path || console->log_rotate == 0) | |
1082 | goto out; | |
1083 | ||
1084 | /* be very certain things are kosher */ | |
1085 | rsp.ret = -EBADF; | |
1086 | if (console->log_fd < 0) | |
1087 | goto out; | |
1088 | ||
1089 | len = strlen(console->log_path) + sizeof(".1"); | |
1090 | tmp = alloca(len); | |
1091 | ||
1092 | rsp.ret = -EFBIG; | |
1093 | ret = snprintf(tmp, len, "%s.1", console->log_path); | |
1094 | if (ret < 0 || (size_t)ret >= len) | |
1095 | goto out; | |
1096 | ||
1097 | close(console->log_fd); | |
1098 | console->log_fd = -1; | |
1099 | rsp.ret = lxc_unpriv(rename(console->log_path, tmp)); | |
1100 | if (rsp.ret < 0) | |
1101 | goto out; | |
1102 | ||
1103 | rsp.ret = lxc_console_create_log_file(console); | |
cf685555 | 1104 | } else if (rsp.datalen > 0) { |
191d43cc | 1105 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
cf685555 | 1106 | } |
191d43cc CB |
1107 | |
1108 | out: | |
1109 | return lxc_cmd_rsp_send(fd, &rsp); | |
1110 | } | |
1111 | ||
ef6e34ee | 1112 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
ded1d23f | 1113 | struct lxc_handler *handler) |
724e753c | 1114 | { |
ef6e34ee DE |
1115 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *); |
1116 | ||
1117 | callback cb[LXC_CMD_MAX] = { | |
54446942 CB |
1118 | [LXC_CMD_CONSOLE] = lxc_cmd_console_callback, |
1119 | [LXC_CMD_CONSOLE_WINCH] = lxc_cmd_console_winch_callback, | |
1120 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, | |
1121 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1122 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1123 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1124 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1125 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1126 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1127 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1128 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
0d9cd9c3 | 1129 | [LXC_CMD_SET_CONFIG_ITEM] = lxc_cmd_set_config_item_callback, |
191d43cc | 1130 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, |
724e753c MN |
1131 | }; |
1132 | ||
f371aca9 | 1133 | if (req->cmd >= LXC_CMD_MAX) { |
fe84a562 | 1134 | ERROR("Undefined command id %d", req->cmd); |
724e753c | 1135 | return -1; |
ef6e34ee DE |
1136 | } |
1137 | return cb[req->cmd](fd, req, handler); | |
724e753c MN |
1138 | } |
1139 | ||
ef6e34ee | 1140 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
f6fc1565 CB |
1141 | struct lxc_epoll_descr *descr, |
1142 | const lxc_cmd_t cmd) | |
724e753c | 1143 | { |
d39b10eb | 1144 | struct lxc_state_client *client; |
f6fc1565 CB |
1145 | struct lxc_list *cur, *next; |
1146 | ||
b5159817 | 1147 | lxc_console_free(handler->conf, fd); |
724e753c | 1148 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 CB |
1149 | if (cmd != LXC_CMD_ADD_STATE_CLIENT) { |
1150 | close(fd); | |
1151 | return; | |
1152 | } | |
1153 | ||
1154 | process_lock(); | |
d39b10eb | 1155 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
f6fc1565 CB |
1156 | client = cur->elem; |
1157 | if (client->clientfd != fd) | |
1158 | continue; | |
1159 | ||
1160 | /* kick client from list */ | |
1161 | close(client->clientfd); | |
1162 | lxc_list_del(cur); | |
1163 | free(cur->elem); | |
1164 | free(cur); | |
b1ca434a CB |
1165 | /* No need to walk the whole list. If we found the state client |
1166 | * fd there can't be a second one. | |
1167 | */ | |
1168 | break; | |
f6fc1565 CB |
1169 | } |
1170 | process_unlock(); | |
724e753c MN |
1171 | } |
1172 | ||
84c92abd DE |
1173 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1174 | struct lxc_epoll_descr *descr) | |
724e753c MN |
1175 | { |
1176 | int ret; | |
ef6e34ee | 1177 | struct lxc_cmd_req req; |
191d43cc | 1178 | void *reqdata = NULL; |
724e753c MN |
1179 | struct lxc_handler *handler = data; |
1180 | ||
aae93dd3 | 1181 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
0a3ec350 | 1182 | if (ret == -EACCES) { |
fe84a562 CB |
1183 | /* We don't care for the peer, just send and close. */ |
1184 | struct lxc_cmd_rsp rsp = {.ret = ret}; | |
ef6e34ee DE |
1185 | |
1186 | lxc_cmd_rsp_send(fd, &rsp); | |
3cc5de36 | 1187 | goto out_close; |
ded1d23f DL |
1188 | } |
1189 | ||
1190 | if (ret < 0) { | |
fe84a562 CB |
1191 | SYSERROR("Failed to receive data on command socket for command " |
1192 | "\"%s\"", lxc_cmd_str(req.cmd)); | |
724e753c MN |
1193 | goto out_close; |
1194 | } | |
1195 | ||
fe84a562 | 1196 | if (ret == 0) |
724e753c | 1197 | goto out_close; |
724e753c | 1198 | |
ef6e34ee | 1199 | if (ret != sizeof(req)) { |
c01c2be6 | 1200 | WARN("Failed to receive full command request. Ignoring request " |
fe84a562 | 1201 | "for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1202 | ret = -1; |
1203 | goto out_close; | |
1204 | } | |
1205 | ||
191d43cc CB |
1206 | if ((req.datalen > LXC_CMD_DATA_MAX) && |
1207 | (req.cmd != LXC_CMD_CONSOLE_LOG)) { | |
c01c2be6 | 1208 | ERROR("Received command data length %d is too large for " |
fe84a562 CB |
1209 | "command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); |
1210 | errno = EFBIG; | |
1211 | ret = -EFBIG; | |
724e753c MN |
1212 | goto out_close; |
1213 | } | |
1214 | ||
ef6e34ee | 1215 | if (req.datalen > 0) { |
191d43cc CB |
1216 | /* LXC_CMD_CONSOLE_LOG needs to be able to allocate data |
1217 | * that exceeds LXC_CMD_DATA_MAX: use malloc() for that. | |
1218 | */ | |
1219 | if (req.cmd == LXC_CMD_CONSOLE_LOG) | |
1220 | reqdata = malloc(req.datalen); | |
1221 | else | |
1222 | reqdata = alloca(req.datalen); | |
1223 | if (!reqdata) { | |
1224 | ERROR("Failed to allocate memory for \"%s\" command", | |
1225 | lxc_cmd_str(req.cmd)); | |
1226 | errno = ENOMEM; | |
1227 | ret = -ENOMEM; | |
1228 | goto out_close; | |
1229 | } | |
ef6e34ee | 1230 | |
ef6e34ee DE |
1231 | ret = recv(fd, reqdata, req.datalen, 0); |
1232 | if (ret != req.datalen) { | |
c01c2be6 | 1233 | WARN("Failed to receive full command request. Ignoring " |
fe84a562 | 1234 | "request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1235 | ret = -1; |
1236 | goto out_close; | |
1237 | } | |
fe84a562 | 1238 | |
ef6e34ee DE |
1239 | req.data = reqdata; |
1240 | } | |
1241 | ||
1242 | ret = lxc_cmd_process(fd, &req, handler); | |
724e753c | 1243 | if (ret) { |
fe84a562 | 1244 | /* This is not an error, but only a request to close fd. */ |
724e753c MN |
1245 | ret = 0; |
1246 | goto out_close; | |
1247 | } | |
1248 | ||
1249 | out: | |
191d43cc CB |
1250 | if (req.cmd == LXC_CMD_CONSOLE_LOG && reqdata) |
1251 | free(reqdata); | |
1252 | ||
724e753c | 1253 | return ret; |
fe84a562 | 1254 | |
724e753c | 1255 | out_close: |
f6fc1565 | 1256 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
1257 | goto out; |
1258 | } | |
1259 | ||
84c92abd DE |
1260 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
1261 | struct lxc_epoll_descr *descr) | |
724e753c | 1262 | { |
fe84a562 CB |
1263 | int connection; |
1264 | int opt = 1, ret = -1; | |
724e753c MN |
1265 | |
1266 | connection = accept(fd, NULL, 0); | |
1267 | if (connection < 0) { | |
08aa08fe | 1268 | SYSERROR("Failed to accept connection to run command."); |
724e753c MN |
1269 | return -1; |
1270 | } | |
1271 | ||
fe84a562 CB |
1272 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
1273 | if (ret < 0) { | |
1274 | SYSERROR("Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc DL |
1275 | goto out_close; |
1276 | } | |
1277 | ||
fe84a562 CB |
1278 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
1279 | if (ret < 0) { | |
1280 | SYSERROR("Failed to enable necessary credentials on command socket"); | |
724e753c MN |
1281 | goto out_close; |
1282 | } | |
1283 | ||
ef6e34ee | 1284 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
724e753c | 1285 | if (ret) { |
fe84a562 | 1286 | ERROR("Failed to add command handler"); |
724e753c MN |
1287 | goto out_close; |
1288 | } | |
1289 | ||
1290 | out: | |
1291 | return ret; | |
1292 | ||
1293 | out_close: | |
1294 | close(connection); | |
1295 | goto out; | |
1296 | } | |
1297 | ||
9dfa4041 | 1298 | int lxc_cmd_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 1299 | { |
fe84a562 CB |
1300 | int fd, len, ret; |
1301 | char path[sizeof(((struct sockaddr_un *)0)->sun_path)] = {0}; | |
46968ea3 | 1302 | char *offset = &path[1]; |
724e753c | 1303 | |
6f2944c1 TA |
1304 | /* -2 here because this is an abstract unix socket so it needs a |
1305 | * leading \0, and we null terminate, so it needs a trailing \0. | |
1306 | * Although null termination isn't required by the API, we do it anyway | |
1307 | * because we print the sockname out sometimes. | |
1308 | */ | |
860e7c43 | 1309 | len = sizeof(path) - 2; |
9dfa4041 | 1310 | ret = lxc_make_abstract_socket_name(offset, len, name, lxcpath, NULL, suffix); |
fe84a562 | 1311 | if (ret < 0) |
9ba8130c | 1312 | return -1; |
9dfa4041 | 1313 | TRACE("Creating abstract unix socket \"%s\"", offset); |
724e753c | 1314 | |
aae93dd3 | 1315 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 1316 | if (fd < 0) { |
fe84a562 CB |
1317 | ERROR("%s - Failed to create command socket %s", |
1318 | strerror(errno), offset); | |
08aa08fe | 1319 | if (errno == EADDRINUSE) |
fe84a562 | 1320 | ERROR("Container \"%s\" appears to be already running", name); |
724e753c MN |
1321 | return -1; |
1322 | } | |
1323 | ||
fe84a562 CB |
1324 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
1325 | if (ret < 0) { | |
1326 | SYSERROR("Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f DL |
1327 | close(fd); |
1328 | return -1; | |
1329 | } | |
1330 | ||
9dfa4041 | 1331 | return fd; |
d2e30e99 DE |
1332 | } |
1333 | ||
fe84a562 | 1334 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 1335 | struct lxc_handler *handler) |
d2e30e99 | 1336 | { |
fe84a562 CB |
1337 | int ret; |
1338 | int fd = handler->conf->maincmd_fd; | |
d2e30e99 | 1339 | |
ef6e34ee | 1340 | ret = lxc_mainloop_add_handler(descr, fd, lxc_cmd_accept, handler); |
fe84a562 CB |
1341 | if (ret < 0) { |
1342 | ERROR("Failed to add handler for command socket"); | |
724e753c MN |
1343 | close(fd); |
1344 | } | |
1345 | ||
1346 | return ret; | |
1347 | } |