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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 | ||
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
cf685555 | 27 | #include <caps.h> |
724e753c | 28 | #include <errno.h> |
91480a0f | 29 | #include <fcntl.h> |
fe84a562 | 30 | #include <malloc.h> |
37515ebd | 31 | #include <poll.h> |
fe84a562 CB |
32 | #include <signal.h> |
33 | #include <stdio.h> | |
34 | #include <stdlib.h> | |
fe84a562 | 35 | #include <sys/param.h> |
724e753c MN |
36 | #include <sys/socket.h> |
37 | #include <sys/un.h> | |
d38dd64a | 38 | #include <unistd.h> |
724e753c | 39 | |
fe84a562 | 40 | #include "af_unix.h" |
f2363e38 | 41 | #include "cgroup.h" |
724e753c | 42 | #include "commands.h" |
bbf5cf35 | 43 | #include "commands_utils.h" |
fe84a562 | 44 | #include "conf.h" |
d38dd64a | 45 | #include "config.h" |
ef6e34ee | 46 | #include "confile.h" |
fe84a562 CB |
47 | #include "log.h" |
48 | #include "lxc.h" | |
dbc9832d | 49 | #include "lxclock.h" |
724e753c | 50 | #include "mainloop.h" |
dbc9832d | 51 | #include "monitor.h" |
fe84a562 | 52 | #include "start.h" |
0ed9b1bc | 53 | #include "terminal.h" |
fe84a562 | 54 | #include "utils.h" |
724e753c | 55 | |
ded1d23f | 56 | /* |
fe84a562 CB |
57 | * This file provides the different functions for clients to query/command the |
58 | * server. The client is typically some lxc tool and the server is typically the | |
59 | * container (ie. lxc-start). | |
ded1d23f | 60 | * |
fe84a562 CB |
61 | * Each command is transactional, the clients send a request to the server and |
62 | * the server answers the request with a message giving the request's status | |
63 | * (zero or a negative errno value). Both the request and response may contain | |
64 | * additional data. | |
ded1d23f | 65 | * |
fe84a562 CB |
66 | * Each command is wrapped in a ancillary message in order to pass a credential |
67 | * making possible to the server to check if the client is allowed to ask for | |
68 | * this command or not. | |
80bcb053 | 69 | * |
fe84a562 CB |
70 | * IMPORTANTLY: Note that semantics for current commands are fixed. If you wish |
71 | * to make any changes to how, say, LXC_CMD_GET_CONFIG_ITEM works by adding | |
72 | * information to the end of cmd.data, then you must introduce a new | |
73 | * LXC_CMD_GET_CONFIG_ITEM_V2 define with a new number. You may wish to also | |
74 | * mark LXC_CMD_GET_CONFIG_ITEM deprecated in commands.h. | |
80bcb053 SH |
75 | * |
76 | * This is necessary in order to avoid having a newly compiled lxc command | |
77 | * communicating with a running (old) monitor from crashing the running | |
78 | * container. | |
ded1d23f DL |
79 | */ |
80 | ||
ac2cecc4 | 81 | lxc_log_define(commands, lxc); |
724e753c | 82 | |
ef6e34ee | 83 | static const char *lxc_cmd_str(lxc_cmd_t cmd) |
724e753c | 84 | { |
fe84a562 | 85 | static const char *const cmdname[LXC_CMD_MAX] = { |
974a8aba | 86 | [LXC_CMD_CONSOLE] = "console", |
8ccbbf94 | 87 | [LXC_CMD_TERMINAL_WINCH] = "terminal_winch", |
974a8aba CB |
88 | [LXC_CMD_STOP] = "stop", |
89 | [LXC_CMD_GET_STATE] = "get_state", | |
90 | [LXC_CMD_GET_INIT_PID] = "get_init_pid", | |
91 | [LXC_CMD_GET_CLONE_FLAGS] = "get_clone_flags", | |
92 | [LXC_CMD_GET_CGROUP] = "get_cgroup", | |
93 | [LXC_CMD_GET_CONFIG_ITEM] = "get_config_item", | |
94 | [LXC_CMD_GET_NAME] = "get_name", | |
95 | [LXC_CMD_GET_LXCPATH] = "get_lxcpath", | |
96 | [LXC_CMD_ADD_STATE_CLIENT] = "add_state_client", | |
97 | [LXC_CMD_CONSOLE_LOG] = "console_log", | |
98 | [LXC_CMD_SERVE_STATE_CLIENTS] = "serve_state_clients", | |
ef6e34ee | 99 | }; |
724e753c | 100 | |
f371aca9 | 101 | if (cmd >= LXC_CMD_MAX) |
a8007512 | 102 | return "Invalid request"; |
fe84a562 | 103 | |
ef6e34ee DE |
104 | return cmdname[cmd]; |
105 | } | |
106 | ||
107 | /* | |
108 | * lxc_cmd_rsp_recv: Receive a response to a command | |
109 | * | |
110 | * @sock : the socket connected to the container | |
111 | * @cmd : command to put response in | |
112 | * | |
113 | * Returns the size of the response message or < 0 on failure | |
114 | * | |
115 | * Note that if the command response datalen > 0, then data is | |
116 | * a malloc()ed buffer and should be free()ed by the caller. If | |
117 | * the response data is <= a void * worth of data, it will be | |
118 | * stored directly in data and datalen will be 0. | |
119 | * | |
120 | * As a special case, the response for LXC_CMD_CONSOLE is created | |
0115f8fd DE |
121 | * here as it contains an fd for the master pty passed through the |
122 | * unix socket. | |
ef6e34ee DE |
123 | */ |
124 | static int lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) | |
125 | { | |
2945ea97 | 126 | int ret, rspfd; |
ef6e34ee DE |
127 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
128 | ||
ae467c54 | 129 | ret = lxc_abstract_unix_recv_fds(sock, &rspfd, 1, rsp, sizeof(*rsp)); |
ef6e34ee | 130 | if (ret < 0) { |
a24c5678 | 131 | SYSWARN("Failed to receive response for command \"%s\"", |
132 | lxc_cmd_str(cmd->req.cmd)); | |
133 | ||
6b7f85cb | 134 | if (errno == ECONNRESET) |
2a850b2c | 135 | return -1; |
6b7f85cb | 136 | |
ef6e34ee DE |
137 | return -1; |
138 | } | |
fe84a562 | 139 | TRACE("Command \"%s\" received response", lxc_cmd_str(cmd->req.cmd)); |
ef6e34ee DE |
140 | |
141 | if (cmd->req.cmd == LXC_CMD_CONSOLE) { | |
142 | struct lxc_cmd_console_rsp_data *rspdata; | |
143 | ||
0115f8fd DE |
144 | /* recv() returns 0 bytes when a tty cannot be allocated, |
145 | * rsp->ret is < 0 when the peer permission check failed | |
146 | */ | |
147 | if (ret == 0 || rsp->ret < 0) | |
148 | return 0; | |
149 | ||
ef6e34ee DE |
150 | rspdata = malloc(sizeof(*rspdata)); |
151 | if (!rspdata) { | |
2a850b2c | 152 | errno = ENOMEM; |
fe84a562 | 153 | ERROR("Failed to allocate response buffer for command \"%s\"", |
ef6e34ee | 154 | lxc_cmd_str(cmd->req.cmd)); |
2a850b2c | 155 | return -1; |
ef6e34ee | 156 | } |
2a850b2c | 157 | |
0115f8fd | 158 | rspdata->masterfd = rspfd; |
ef6e34ee DE |
159 | rspdata->ttynum = PTR_TO_INT(rsp->data); |
160 | rsp->data = rspdata; | |
161 | } | |
162 | ||
860e7c43 | 163 | if (rsp->datalen == 0) { |
fe84a562 | 164 | DEBUG("Response data length for command \"%s\" is 0", |
860e7c43 | 165 | lxc_cmd_str(cmd->req.cmd)); |
ae5c8b8e | 166 | return ret; |
860e7c43 | 167 | } |
fe84a562 | 168 | |
191d43cc CB |
169 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && |
170 | (cmd->req.cmd != LXC_CMD_CONSOLE_LOG)) { | |
2a850b2c CB |
171 | ERROR("Response data for command \"%s\" is too long: %d bytes > %d", |
172 | lxc_cmd_str(cmd->req.cmd), rsp->datalen, LXC_CMD_DATA_MAX); | |
173 | return -1; | |
2ac9aafc | 174 | } |
ef6e34ee | 175 | |
191d43cc CB |
176 | if (cmd->req.cmd == LXC_CMD_CONSOLE_LOG) { |
177 | rsp->data = malloc(rsp->datalen + 1); | |
178 | ((char *)rsp->data)[rsp->datalen] = '\0'; | |
179 | } else { | |
180 | rsp->data = malloc(rsp->datalen); | |
181 | } | |
ef6e34ee | 182 | if (!rsp->data) { |
fe84a562 | 183 | errno = ENOMEM; |
2a850b2c CB |
184 | ERROR("Failed to allocate response buffer for command \"%s\"", |
185 | lxc_cmd_str(cmd->req.cmd)); | |
186 | return -1; | |
ef6e34ee | 187 | } |
fe84a562 | 188 | |
2a850b2c | 189 | ret = lxc_recv_nointr(sock, rsp->data, rsp->datalen, 0); |
ef6e34ee | 190 | if (ret != rsp->datalen) { |
6d1400b5 | 191 | SYSERROR("Failed to receive response data for command \"%s\"", |
192 | lxc_cmd_str(cmd->req.cmd)); | |
2a850b2c | 193 | return -1; |
ef6e34ee | 194 | } |
724e753c MN |
195 | |
196 | return ret; | |
197 | } | |
198 | ||
ef6e34ee DE |
199 | /* |
200 | * lxc_cmd_rsp_send: Send a command response | |
201 | * | |
202 | * @fd : file descriptor of socket to send response on | |
203 | * @rsp : response to send | |
204 | * | |
205 | * Returns 0 on success, < 0 on failure | |
206 | */ | |
207 | static int lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) | |
208 | { | |
fe84a562 | 209 | ssize_t ret; |
ef6e34ee | 210 | |
7fbb15ec CB |
211 | errno = EMSGSIZE; |
212 | ret = lxc_send_nointr(fd, rsp, sizeof(*rsp), MSG_NOSIGNAL); | |
fe84a562 | 213 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) { |
6d1400b5 | 214 | SYSERROR("Failed to send command response %zd", ret); |
ef6e34ee DE |
215 | return -1; |
216 | } | |
217 | ||
a674dfe1 | 218 | if (!rsp->data || rsp->datalen <= 0) |
fe84a562 CB |
219 | return 0; |
220 | ||
7fbb15ec CB |
221 | errno = EMSGSIZE; |
222 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
fe84a562 | 223 | if (ret < 0 || ret != (ssize_t)rsp->datalen) { |
a24c5678 | 224 | SYSWARN("Failed to send command response data %zd", ret); |
fe84a562 | 225 | return -1; |
ef6e34ee | 226 | } |
fe84a562 | 227 | |
ef6e34ee DE |
228 | return 0; |
229 | } | |
230 | ||
c01c2be6 | 231 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 232 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 | 233 | { |
2a850b2c | 234 | int client_fd, saved_errno; |
fe84a562 | 235 | ssize_t ret = -1; |
c01c2be6 | 236 | |
9dfa4041 | 237 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
2a850b2c | 238 | if (client_fd < 0) |
fe84a562 | 239 | return -1; |
c01c2be6 | 240 | |
fe84a562 CB |
241 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
242 | sizeof(cmd->req)); | |
2a850b2c CB |
243 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) |
244 | goto on_error; | |
9044b79e | 245 | |
fe84a562 CB |
246 | if (cmd->req.datalen <= 0) |
247 | return client_fd; | |
c01c2be6 | 248 | |
7fbb15ec CB |
249 | errno = EMSGSIZE; |
250 | ret = lxc_send_nointr(client_fd, (void *)cmd->req.data, | |
251 | cmd->req.datalen, MSG_NOSIGNAL); | |
2a850b2c CB |
252 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) |
253 | goto on_error; | |
c01c2be6 | 254 | |
2a850b2c | 255 | return client_fd; |
c01c2be6 | 256 | |
2a850b2c CB |
257 | on_error: |
258 | saved_errno = errno; | |
259 | close(client_fd); | |
260 | errno = saved_errno; | |
c01c2be6 | 261 | |
2a850b2c | 262 | return -1; |
c01c2be6 CB |
263 | } |
264 | ||
ef6e34ee DE |
265 | /* |
266 | * lxc_cmd: Connect to the specified running container, send it a command | |
267 | * request and collect the response | |
268 | * | |
269 | * @name : name of container to connect to | |
1e8cfdf6 | 270 | * @cmd : command with initialized request to send |
ef6e34ee DE |
271 | * @stopped : output indicator if the container was not running |
272 | * @lxcpath : the lxcpath in which the container is running | |
273 | * | |
274 | * Returns the size of the response message on success, < 0 on failure | |
275 | * | |
276 | * Note that there is a special case for LXC_CMD_CONSOLE. For this command | |
277 | * the fd cannot be closed because it is used as a placeholder to indicate | |
278 | * that a particular tty slot is in use. The fd is also used as a signal to | |
279 | * the container that when the caller dies or closes the fd, the container | |
0115f8fd DE |
280 | * will notice the fd on its side of the socket in its mainloop select and |
281 | * then free the slot with lxc_cmd_fd_cleanup(). The socket fd will be | |
282 | * returned in the cmd response structure. | |
ef6e34ee DE |
283 | */ |
284 | static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped, | |
88556fd7 | 285 | const char *lxcpath, const char *hashed_sock_name) |
724e753c | 286 | { |
2a850b2c | 287 | int client_fd, saved_errno; |
fe84a562 | 288 | int ret = -1; |
dbc9832d CB |
289 | bool stay_connected = false; |
290 | ||
291 | if (cmd->req.cmd == LXC_CMD_CONSOLE || | |
54446942 | 292 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 293 | stay_connected = true; |
724e753c | 294 | |
0ecf64b5 SH |
295 | *stopped = 0; |
296 | ||
c01c2be6 CB |
297 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
298 | if (client_fd < 0) { | |
7874d81a | 299 | SYSTRACE("Command \"%s\" failed to connect command socket", |
300 | lxc_cmd_str(cmd->req.cmd)); | |
6a93ae77 | 301 | |
00e5ca13 | 302 | if (errno == ECONNREFUSED || errno == EPIPE) |
ef6e34ee | 303 | *stopped = 1; |
3f903c04 | 304 | |
2a850b2c | 305 | return -1; |
724e753c MN |
306 | } |
307 | ||
c01c2be6 | 308 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
2a850b2c | 309 | if (ret < 0 && errno == ECONNRESET) |
6b7f85cb | 310 | *stopped = 1; |
6a93ae77 | 311 | |
00e5ca13 CB |
312 | if (!stay_connected || ret <= 0) { |
313 | saved_errno = errno; | |
314 | close(client_fd); | |
315 | errno = saved_errno; | |
316 | return ret; | |
317 | } | |
fe84a562 | 318 | |
0115f8fd | 319 | if (stay_connected && ret > 0) |
c01c2be6 | 320 | cmd->rsp.ret = client_fd; |
43eb6f29 | 321 | |
1362f2eb | 322 | return ret; |
724e753c MN |
323 | } |
324 | ||
b494d2dd SH |
325 | int lxc_try_cmd(const char *name, const char *lxcpath) |
326 | { | |
0ecf64b5 | 327 | int stopped, ret; |
b494d2dd SH |
328 | struct lxc_cmd_rr cmd = { |
329 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
330 | }; | |
331 | ||
88556fd7 | 332 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
333 | if (stopped) |
334 | return 0; | |
335 | if (ret > 0 && cmd.rsp.ret < 0) { | |
336 | errno = cmd.rsp.ret; | |
337 | return -1; | |
338 | } | |
339 | if (ret > 0) | |
340 | return 0; | |
341 | ||
fe84a562 CB |
342 | /* At this point we weren't denied access, and the container *was* |
343 | * started. There was some inexplicable error in the protocol. I'm not | |
344 | * clear on whether we should return -1 here, but we didn't receive a | |
345 | * -EACCES, so technically it's not that we're not allowed to control | |
346 | * the container - it's just not behaving. | |
b494d2dd SH |
347 | */ |
348 | return 0; | |
349 | } | |
350 | ||
cc4c0832 | 351 | /* Implementations of the commands and their callbacks */ |
ef6e34ee DE |
352 | |
353 | /* | |
354 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
355 | * | |
356 | * @name : name of container to connect to | |
357 | * @lxcpath : the lxcpath in which the container is running | |
358 | * | |
359 | * Returns the pid on success, < 0 on failure | |
360 | */ | |
361 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 362 | { |
0ecf64b5 | 363 | int ret, stopped; |
9234406b | 364 | intmax_t pid; |
ef6e34ee | 365 | struct lxc_cmd_rr cmd = { |
e8cd1208 CB |
366 | .req = { |
367 | .cmd = LXC_CMD_GET_INIT_PID | |
368 | }, | |
369 | .rsp = { | |
9234406b | 370 | .data = INTMAX_TO_PTR((intmax_t){-1}) |
e8cd1208 | 371 | } |
ef6e34ee DE |
372 | }; |
373 | ||
88556fd7 | 374 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 375 | if (ret < 0) |
8ed8a626 | 376 | return -1; |
ef6e34ee | 377 | |
9234406b CB |
378 | pid = PTR_TO_INTMAX(cmd.rsp.data); |
379 | if (pid < 0) | |
380 | return -1; | |
381 | ||
382 | /* We need to assume that pid_t can actually hold any pid given to us | |
383 | * by the kernel. If it can't it's a libc bug. | |
384 | */ | |
385 | return (pid_t)pid; | |
43eb6f29 DL |
386 | } |
387 | ||
ef6e34ee DE |
388 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
389 | struct lxc_handler *handler) | |
43eb6f29 | 390 | { |
54dcfd81 CB |
391 | intmax_t pid = handler->pid; |
392 | ||
9234406b | 393 | struct lxc_cmd_rsp rsp = { |
54dcfd81 | 394 | .data = INTMAX_TO_PTR(pid) |
9234406b | 395 | }; |
ef6e34ee DE |
396 | |
397 | return lxc_cmd_rsp_send(fd, &rsp); | |
43eb6f29 DL |
398 | } |
399 | ||
ef6e34ee DE |
400 | /* |
401 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
402 | * | |
403 | * @name : name of container to connect to | |
404 | * @lxcpath : the lxcpath in which the container is running | |
405 | * | |
406 | * Returns the clone flags on success, < 0 on failure | |
407 | */ | |
408 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
409 | { | |
0ecf64b5 | 410 | int ret, stopped; |
ef6e34ee DE |
411 | struct lxc_cmd_rr cmd = { |
412 | .req = { .cmd = LXC_CMD_GET_CLONE_FLAGS }, | |
413 | }; | |
414 | ||
88556fd7 | 415 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
416 | if (ret < 0) |
417 | return ret; | |
43eb6f29 | 418 | |
ef6e34ee DE |
419 | return PTR_TO_INT(cmd.rsp.data); |
420 | } | |
421 | ||
422 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
423 | struct lxc_handler *handler) | |
26b2d152 | 424 | { |
becad0ec | 425 | struct lxc_cmd_rsp rsp = { .data = INT_TO_PTR(handler->ns_clone_flags) }; |
ef6e34ee DE |
426 | |
427 | return lxc_cmd_rsp_send(fd, &rsp); | |
428 | } | |
429 | ||
430 | /* | |
431 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
432 | * particular subsystem. This is the cgroup path relative to the root | |
433 | * of the cgroup filesystem. | |
434 | * | |
ef6e34ee DE |
435 | * @name : name of container to connect to |
436 | * @lxcpath : the lxcpath in which the container is running | |
b98f7d6e | 437 | * @subsystem : the subsystem being asked about |
ef6e34ee DE |
438 | * |
439 | * Returns the path on success, NULL on failure. The caller must free() the | |
440 | * returned path. | |
441 | */ | |
b98f7d6e | 442 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, |
fe84a562 | 443 | const char *subsystem) |
ef6e34ee | 444 | { |
0ecf64b5 | 445 | int ret, stopped; |
ef6e34ee | 446 | struct lxc_cmd_rr cmd = { |
b98f7d6e SH |
447 | .req = { |
448 | .cmd = LXC_CMD_GET_CGROUP, | |
b98f7d6e | 449 | .data = subsystem, |
c2aed66d | 450 | .datalen = 0, |
b98f7d6e | 451 | }, |
26b2d152 MN |
452 | }; |
453 | ||
c2aed66d CB |
454 | cmd.req.data = subsystem; |
455 | cmd.req.datalen = 0; | |
456 | if (subsystem) | |
457 | cmd.req.datalen = strlen(subsystem) + 1; | |
458 | ||
88556fd7 | 459 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 460 | if (ret < 0) |
ef6e34ee DE |
461 | return NULL; |
462 | ||
fe84a562 | 463 | if (ret == 0) |
ef6e34ee | 464 | return NULL; |
ef6e34ee | 465 | |
fe84a562 | 466 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 467 | return NULL; |
3f903c04 | 468 | |
ef6e34ee DE |
469 | return cmd.rsp.data; |
470 | } | |
471 | ||
472 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
473 | struct lxc_handler *handler) | |
474 | { | |
4fb3cba5 | 475 | const char *path; |
fe84a562 | 476 | struct lxc_cmd_rsp rsp; |
2202afc9 | 477 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
b98f7d6e | 478 | |
c2aed66d | 479 | if (req->datalen > 0) |
2202afc9 | 480 | path = cgroup_ops->get_cgroup(cgroup_ops, req->data); |
c2aed66d | 481 | else |
2202afc9 | 482 | path = cgroup_ops->get_cgroup(cgroup_ops, NULL); |
b98f7d6e SH |
483 | if (!path) |
484 | return -1; | |
fe84a562 | 485 | |
4f17323e | 486 | rsp.ret = 0; |
fe84a562 CB |
487 | rsp.datalen = strlen(path) + 1; |
488 | rsp.data = (char *)path; | |
ef6e34ee DE |
489 | |
490 | return lxc_cmd_rsp_send(fd, &rsp); | |
491 | } | |
492 | ||
493 | /* | |
494 | * lxc_cmd_get_config_item: Get config item the running container | |
495 | * | |
496 | * @name : name of container to connect to | |
7fa3f2e9 | 497 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
498 | * @lxcpath : the lxcpath in which the container is running |
499 | * | |
500 | * Returns the item on success, NULL on failure. The caller must free() the | |
501 | * returned item. | |
502 | */ | |
503 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
504 | const char *lxcpath) | |
505 | { | |
0ecf64b5 | 506 | int ret, stopped; |
ef6e34ee DE |
507 | struct lxc_cmd_rr cmd = { |
508 | .req = { .cmd = LXC_CMD_GET_CONFIG_ITEM, | |
509 | .data = item, | |
fe84a562 | 510 | .datalen = strlen(item) + 1, |
ef6e34ee DE |
511 | }, |
512 | }; | |
513 | ||
88556fd7 | 514 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
515 | if (ret < 0) |
516 | return NULL; | |
517 | ||
518 | if (cmd.rsp.ret == 0) | |
519 | return cmd.rsp.data; | |
fe84a562 | 520 | |
ef6e34ee DE |
521 | return NULL; |
522 | } | |
523 | ||
524 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
525 | struct lxc_handler *handler) | |
526 | { | |
527 | int cilen; | |
ef6e34ee | 528 | char *cidata; |
30aec088 | 529 | struct lxc_config_t *item; |
fe84a562 | 530 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
531 | |
532 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 533 | item = lxc_get_config(req->data); |
30aec088 CB |
534 | if (!item) |
535 | goto err1; | |
fe84a562 | 536 | |
cccd2219 | 537 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
538 | if (cilen <= 0) |
539 | goto err1; | |
540 | ||
541 | cidata = alloca(cilen + 1); | |
cccd2219 | 542 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 543 | goto err1; |
fe84a562 | 544 | |
ef6e34ee DE |
545 | cidata[cilen] = '\0'; |
546 | rsp.data = cidata; | |
547 | rsp.datalen = cilen + 1; | |
548 | rsp.ret = 0; | |
549 | goto out; | |
550 | ||
551 | err1: | |
552 | rsp.ret = -1; | |
553 | out: | |
554 | return lxc_cmd_rsp_send(fd, &rsp); | |
555 | } | |
556 | ||
557 | /* | |
558 | * lxc_cmd_get_state: Get current state of the container | |
559 | * | |
560 | * @name : name of container to connect to | |
561 | * @lxcpath : the lxcpath in which the container is running | |
562 | * | |
563 | * Returns the state on success, < 0 on failure | |
564 | */ | |
dbc9832d | 565 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 566 | { |
0ecf64b5 | 567 | int ret, stopped; |
ef6e34ee DE |
568 | struct lxc_cmd_rr cmd = { |
569 | .req = { .cmd = LXC_CMD_GET_STATE } | |
570 | }; | |
26b2d152 | 571 | |
88556fd7 | 572 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 573 | if (ret < 0 && stopped) |
ef6e34ee DE |
574 | return STOPPED; |
575 | ||
576 | if (ret < 0) | |
26b2d152 | 577 | return -1; |
26b2d152 | 578 | |
ef6e34ee | 579 | if (!ret) { |
fe84a562 | 580 | WARN("Container \"%s\" has stopped before sending its state", name); |
ef6e34ee DE |
581 | return -1; |
582 | } | |
583 | ||
fe84a562 | 584 | DEBUG("Container \"%s\" is in \"%s\" state", name, |
ef6e34ee | 585 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); |
fe84a562 | 586 | |
ef6e34ee DE |
587 | return PTR_TO_INT(cmd.rsp.data); |
588 | } | |
589 | ||
590 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
591 | struct lxc_handler *handler) | |
592 | { | |
593 | struct lxc_cmd_rsp rsp = { .data = INT_TO_PTR(handler->state) }; | |
594 | ||
595 | return lxc_cmd_rsp_send(fd, &rsp); | |
596 | } | |
597 | ||
598 | /* | |
599 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
600 | * the processes running inside this container will be killed. | |
601 | * | |
602 | * @name : name of container to connect to | |
603 | * @lxcpath : the lxcpath in which the container is running | |
604 | * | |
605 | * Returns 0 on success, < 0 on failure | |
606 | */ | |
607 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
608 | { | |
0ecf64b5 | 609 | int ret, stopped; |
ef6e34ee DE |
610 | struct lxc_cmd_rr cmd = { |
611 | .req = { .cmd = LXC_CMD_STOP }, | |
612 | }; | |
613 | ||
88556fd7 | 614 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 615 | if (ret < 0) { |
ef6e34ee | 616 | if (stopped) { |
fe84a562 | 617 | INFO("Container \"%s\" is already stopped", name); |
ef6e34ee DE |
618 | return 0; |
619 | } | |
fe84a562 | 620 | |
26b2d152 MN |
621 | return -1; |
622 | } | |
623 | ||
fe84a562 CB |
624 | /* We do not expect any answer, because we wait for the connection to be |
625 | * closed. | |
95d5b147 SH |
626 | */ |
627 | if (ret > 0) { | |
6d1400b5 | 628 | errno = -cmd.rsp.ret; |
629 | SYSERROR("Failed to stop container \"%s\"", name); | |
26b2d152 MN |
630 | return -1; |
631 | } | |
632 | ||
fe84a562 | 633 | INFO("Container \"%s\" has stopped", name); |
ef6e34ee | 634 | return 0; |
26b2d152 MN |
635 | } |
636 | ||
ef6e34ee DE |
637 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
638 | struct lxc_handler *handler) | |
d5088cf2 | 639 | { |
ef6e34ee | 640 | struct lxc_cmd_rsp rsp; |
ef6e34ee | 641 | int stopsignal = SIGKILL; |
2202afc9 | 642 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ef6e34ee DE |
643 | |
644 | if (handler->conf->stopsignal) | |
645 | stopsignal = handler->conf->stopsignal; | |
646 | memset(&rsp, 0, sizeof(rsp)); | |
647 | rsp.ret = kill(handler->pid, stopsignal); | |
648 | if (!rsp.ret) { | |
fe84a562 | 649 | /* We can't just use lxc_unfreeze() since we are already in the |
4fb3cba5 DE |
650 | * context of handling the STOP cmd in lxc-start, and calling |
651 | * lxc_unfreeze() would do another cmd (GET_CGROUP) which would | |
fe84a562 | 652 | * deadlock us. |
4fb3cba5 | 653 | */ |
27a5132c | 654 | if (!cgroup_ops->get_cgroup(cgroup_ops, "freezer")) |
d18d43da SG |
655 | return 0; |
656 | ||
2202afc9 | 657 | if (cgroup_ops->unfreeze(cgroup_ops)) |
95d5b147 | 658 | return 0; |
fe84a562 CB |
659 | |
660 | ERROR("Failed to unfreeze container \"%s\"", handler->name); | |
ecfcb3f0 | 661 | rsp.ret = -1; |
ef6e34ee DE |
662 | } |
663 | ||
664 | return lxc_cmd_rsp_send(fd, &rsp); | |
665 | } | |
d5088cf2 | 666 | |
b5159817 | 667 | /* |
8ccbbf94 | 668 | * lxc_cmd_terminal_winch: To process as if a SIGWINCH were received |
b5159817 DE |
669 | * |
670 | * @name : name of container to connect to | |
671 | * @lxcpath : the lxcpath in which the container is running | |
672 | * | |
673 | * Returns 0 on success, < 0 on failure | |
674 | */ | |
8ccbbf94 | 675 | int lxc_cmd_terminal_winch(const char *name, const char *lxcpath) |
b5159817 | 676 | { |
0ecf64b5 | 677 | int ret, stopped; |
b5159817 | 678 | struct lxc_cmd_rr cmd = { |
8ccbbf94 | 679 | .req = { .cmd = LXC_CMD_TERMINAL_WINCH }, |
b5159817 DE |
680 | }; |
681 | ||
88556fd7 | 682 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b5159817 DE |
683 | if (ret < 0) |
684 | return ret; | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
8ccbbf94 CB |
689 | static int lxc_cmd_terminal_winch_callback(int fd, struct lxc_cmd_req *req, |
690 | struct lxc_handler *handler) | |
b5159817 DE |
691 | { |
692 | struct lxc_cmd_rsp rsp = { .data = 0 }; | |
693 | ||
dad4a039 | 694 | lxc_terminal_sigwinch(SIGWINCH); |
fe84a562 | 695 | |
b5159817 DE |
696 | return lxc_cmd_rsp_send(fd, &rsp); |
697 | } | |
698 | ||
ef6e34ee DE |
699 | /* |
700 | * lxc_cmd_console: Open an fd to a tty in the container | |
701 | * | |
702 | * @name : name of container to connect to | |
703 | * @ttynum : in: the tty to open or -1 for next available | |
704 | * : out: the tty allocated | |
705 | * @fd : out: file descriptor for master side of pty | |
706 | * @lxcpath : the lxcpath in which the container is running | |
707 | * | |
0115f8fd | 708 | * Returns fd holding tty allocated on success, < 0 on failure |
ef6e34ee DE |
709 | */ |
710 | int lxc_cmd_console(const char *name, int *ttynum, int *fd, const char *lxcpath) | |
711 | { | |
0ecf64b5 | 712 | int ret, stopped; |
ef6e34ee DE |
713 | struct lxc_cmd_console_rsp_data *rspdata; |
714 | struct lxc_cmd_rr cmd = { | |
715 | .req = { .cmd = LXC_CMD_CONSOLE, .data = INT_TO_PTR(*ttynum) }, | |
716 | }; | |
d5088cf2 | 717 | |
88556fd7 | 718 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
719 | if (ret < 0) |
720 | return ret; | |
0115f8fd DE |
721 | |
722 | if (cmd.rsp.ret < 0) { | |
6d1400b5 | 723 | errno = -cmd.rsp.ret; |
724 | SYSERROR("Denied access to tty"); | |
ef6e34ee DE |
725 | ret = -1; |
726 | goto out; | |
727 | } | |
d5088cf2 | 728 | |
0115f8fd | 729 | if (ret == 0) { |
fe84a562 | 730 | ERROR("tty number %d invalid, busy or all ttys busy", *ttynum); |
0115f8fd | 731 | ret = -1; |
ef6e34ee DE |
732 | goto out; |
733 | } | |
ef6e34ee DE |
734 | |
735 | rspdata = cmd.rsp.data; | |
0115f8fd | 736 | if (rspdata->masterfd < 0) { |
fe84a562 | 737 | ERROR("Unable to allocate fd for tty %d", rspdata->ttynum); |
ef6e34ee DE |
738 | goto out; |
739 | } | |
740 | ||
fe84a562 | 741 | ret = cmd.rsp.ret; /* socket fd */ |
0115f8fd | 742 | *fd = rspdata->masterfd; |
ef6e34ee | 743 | *ttynum = rspdata->ttynum; |
fe84a562 CB |
744 | INFO("Alloced fd %d for tty %d via socket %d", *fd, rspdata->ttynum, ret); |
745 | ||
ef6e34ee DE |
746 | out: |
747 | free(cmd.rsp.data); | |
748 | return ret; | |
749 | } | |
750 | ||
751 | static int lxc_cmd_console_callback(int fd, struct lxc_cmd_req *req, | |
752 | struct lxc_handler *handler) | |
753 | { | |
fe84a562 | 754 | int masterfd, ret; |
ef6e34ee | 755 | struct lxc_cmd_rsp rsp; |
fe84a562 | 756 | int ttynum = PTR_TO_INT(req->data); |
ef6e34ee | 757 | |
c1ee47cd | 758 | masterfd = lxc_terminal_allocate(handler->conf, fd, &ttynum); |
b5159817 | 759 | if (masterfd < 0) |
ef6e34ee DE |
760 | goto out_close; |
761 | ||
ef6e34ee DE |
762 | memset(&rsp, 0, sizeof(rsp)); |
763 | rsp.data = INT_TO_PTR(ttynum); | |
fe84a562 CB |
764 | ret = lxc_abstract_unix_send_fds(fd, &masterfd, 1, &rsp, sizeof(rsp)); |
765 | if (ret < 0) { | |
9044b79e | 766 | SYSERROR("Failed to send tty to client"); |
3dfe6f8d | 767 | lxc_terminal_free(handler->conf, fd); |
ef6e34ee DE |
768 | goto out_close; |
769 | } | |
770 | ||
ef6e34ee DE |
771 | return 0; |
772 | ||
773 | out_close: | |
fe84a562 CB |
774 | /* Special indicator to lxc_cmd_handler() to close the fd and do |
775 | * related cleanup. | |
ef6e34ee DE |
776 | */ |
777 | return 1; | |
d5088cf2 CS |
778 | } |
779 | ||
88556fd7 ÇO |
780 | /* |
781 | * lxc_cmd_get_name: Returns the name of the container | |
782 | * | |
783 | * @hashed_sock_name: hashed socket name | |
784 | * | |
785 | * Returns the name on success, NULL on failure. | |
786 | */ | |
787 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
788 | { | |
789 | int ret, stopped; | |
790 | struct lxc_cmd_rr cmd = { | |
791 | .req = { .cmd = LXC_CMD_GET_NAME}, | |
792 | }; | |
793 | ||
794 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 795 | if (ret < 0) |
88556fd7 | 796 | return NULL; |
88556fd7 ÇO |
797 | |
798 | if (cmd.rsp.ret == 0) | |
799 | return cmd.rsp.data; | |
fe84a562 | 800 | |
88556fd7 ÇO |
801 | return NULL; |
802 | } | |
803 | ||
804 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
fe84a562 | 805 | struct lxc_handler *handler) |
88556fd7 ÇO |
806 | { |
807 | struct lxc_cmd_rsp rsp; | |
808 | ||
809 | memset(&rsp, 0, sizeof(rsp)); | |
810 | ||
f0ecc19d | 811 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
812 | rsp.datalen = strlen(handler->name) + 1; |
813 | rsp.ret = 0; | |
814 | ||
815 | return lxc_cmd_rsp_send(fd, &rsp); | |
816 | } | |
817 | ||
818 | /* | |
819 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
820 | * | |
821 | * @hashed_sock_name: hashed socket name | |
822 | * | |
823 | * Returns the lxcpath on success, NULL on failure. | |
824 | */ | |
825 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
826 | { | |
827 | int ret, stopped; | |
828 | struct lxc_cmd_rr cmd = { | |
829 | .req = { .cmd = LXC_CMD_GET_LXCPATH}, | |
830 | }; | |
724e753c | 831 | |
88556fd7 | 832 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 833 | if (ret < 0) |
88556fd7 | 834 | return NULL; |
88556fd7 ÇO |
835 | |
836 | if (cmd.rsp.ret == 0) | |
837 | return cmd.rsp.data; | |
fe84a562 | 838 | |
88556fd7 ÇO |
839 | return NULL; |
840 | } | |
841 | ||
842 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
843 | struct lxc_handler *handler) | |
844 | { | |
845 | struct lxc_cmd_rsp rsp; | |
846 | ||
847 | memset(&rsp, 0, sizeof(rsp)); | |
848 | ||
fe84a562 | 849 | rsp.ret = 0; |
88556fd7 ÇO |
850 | rsp.data = (char *)handler->lxcpath; |
851 | rsp.datalen = strlen(handler->lxcpath) + 1; | |
88556fd7 ÇO |
852 | |
853 | return lxc_cmd_rsp_send(fd, &rsp); | |
854 | } | |
ef6e34ee | 855 | |
54446942 | 856 | int lxc_cmd_add_state_client(const char *name, const char *lxcpath, |
92e35018 CB |
857 | lxc_state_t states[MAX_STATE], |
858 | int *state_client_fd) | |
dbc9832d | 859 | { |
bc631984 | 860 | int state, stopped; |
dbc9832d | 861 | ssize_t ret; |
dbc9832d CB |
862 | struct lxc_cmd_rr cmd = { |
863 | .req = { | |
54446942 | 864 | .cmd = LXC_CMD_ADD_STATE_CLIENT, |
dbc9832d CB |
865 | .data = states, |
866 | .datalen = (sizeof(lxc_state_t) * MAX_STATE) | |
867 | }, | |
868 | }; | |
869 | ||
dbc9832d | 870 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
871 | if (states[STOPPED] != 0 && stopped != 0) |
872 | return STOPPED; | |
873 | ||
dbc9832d | 874 | if (ret < 0) { |
f577e061 | 875 | if (errno != ECONNREFUSED) |
6d1400b5 | 876 | SYSERROR("Failed to execute command"); |
877 | ||
dbc9832d CB |
878 | return -1; |
879 | } | |
fe84a562 | 880 | |
dbc9832d CB |
881 | /* We should now be guaranteed to get an answer from the state sending |
882 | * function. | |
883 | */ | |
dbc9832d | 884 | if (cmd.rsp.ret < 0) { |
6d1400b5 | 885 | errno = -cmd.rsp.ret; |
886 | SYSERROR("Failed to receive socket fd"); | |
dbc9832d CB |
887 | return -1; |
888 | } | |
889 | ||
bc631984 CB |
890 | state = PTR_TO_INT(cmd.rsp.data); |
891 | if (state < MAX_STATE) { | |
44552fb2 CB |
892 | TRACE("Container is already in requested state %s", lxc_state2str(state)); |
893 | close(cmd.rsp.ret); | |
bc631984 CB |
894 | return state; |
895 | } | |
896 | ||
92e35018 | 897 | *state_client_fd = cmd.rsp.ret; |
bc631984 | 898 | TRACE("Added state client %d to state client list", cmd.rsp.ret); |
92e35018 | 899 | return MAX_STATE; |
dbc9832d CB |
900 | } |
901 | ||
54446942 CB |
902 | static int lxc_cmd_add_state_client_callback(int fd, struct lxc_cmd_req *req, |
903 | struct lxc_handler *handler) | |
dbc9832d | 904 | { |
44552fb2 | 905 | int ret; |
dbc9832d | 906 | struct lxc_cmd_rsp rsp = {0}; |
dbc9832d | 907 | |
fe84a562 | 908 | if (req->datalen < 0) |
44552fb2 | 909 | goto reap_client_fd; |
dbc9832d | 910 | |
fe84a562 | 911 | if (req->datalen > (sizeof(lxc_state_t) * MAX_STATE)) |
44552fb2 | 912 | goto reap_client_fd; |
dbc9832d | 913 | |
fe84a562 | 914 | if (!req->data) |
44552fb2 | 915 | goto reap_client_fd; |
dbc9832d | 916 | |
c01c2be6 | 917 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 CB |
918 | if (rsp.ret < 0) |
919 | goto reap_client_fd; | |
920 | ||
bc631984 | 921 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 922 | |
44552fb2 CB |
923 | ret = lxc_cmd_rsp_send(fd, &rsp); |
924 | if (ret < 0) | |
925 | goto reap_client_fd; | |
926 | ||
927 | return 0; | |
928 | ||
929 | reap_client_fd: | |
930 | /* Special indicator to lxc_cmd_handler() to close the fd and do related | |
931 | * cleanup. | |
932 | */ | |
933 | return 1; | |
dbc9832d CB |
934 | } |
935 | ||
191d43cc CB |
936 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
937 | struct lxc_console_log *log) | |
938 | { | |
939 | int ret, stopped; | |
940 | struct lxc_cmd_console_log data; | |
941 | struct lxc_cmd_rr cmd; | |
942 | ||
943 | data.clear = log->clear; | |
944 | data.read = log->read; | |
945 | data.read_max = *log->read_max; | |
946 | ||
947 | cmd.req.cmd = LXC_CMD_CONSOLE_LOG; | |
948 | cmd.req.data = &data; | |
949 | cmd.req.datalen = sizeof(struct lxc_cmd_console_log); | |
950 | ||
951 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
952 | if (ret < 0) | |
953 | return ret; | |
954 | ||
955 | /* There is nothing to be read from the buffer. So clear any values we | |
956 | * where passed to clearly indicate to the user that nothing went wrong. | |
957 | */ | |
63b74cda | 958 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
959 | *log->read_max = 0; |
960 | log->data = NULL; | |
961 | } | |
962 | ||
963 | /* This is a proper error so don't touch any values we were passed. */ | |
964 | if (cmd.rsp.ret < 0) | |
965 | return cmd.rsp.ret; | |
966 | ||
967 | *log->read_max = cmd.rsp.datalen; | |
968 | log->data = cmd.rsp.data; | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
973 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
974 | struct lxc_handler *handler) | |
975 | { | |
976 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 977 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc CB |
978 | const struct lxc_cmd_console_log *log = req->data; |
979 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; | |
980 | ||
981 | rsp.ret = -EFAULT; | |
982 | rsp.datalen = 0; | |
983 | rsp.data = NULL; | |
28f3b1cd | 984 | if (buffer_size <= 0) |
191d43cc CB |
985 | goto out; |
986 | ||
5928191e CB |
987 | if (log->read || log->write_logfile) |
988 | rsp.datalen = lxc_ringbuf_used(buf); | |
989 | ||
191d43cc CB |
990 | if (log->read) |
991 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
992 | ||
993 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
994 | rsp.datalen = log->read_max; | |
995 | ||
996 | /* there's nothing to read */ | |
63b74cda | 997 | rsp.ret = -ENODATA; |
191d43cc | 998 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
999 | goto out; |
1000 | ||
63b74cda | 1001 | rsp.ret = 0; |
23e0d9af | 1002 | if (log->clear) |
43366ca2 | 1003 | lxc_ringbuf_clear(buf); /* clear the ringbuffer */ |
23e0d9af | 1004 | else if (rsp.datalen > 0) |
191d43cc CB |
1005 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
1006 | ||
1007 | out: | |
1008 | return lxc_cmd_rsp_send(fd, &rsp); | |
1009 | } | |
1010 | ||
974a8aba CB |
1011 | int lxc_cmd_serve_state_clients(const char *name, const char *lxcpath, |
1012 | lxc_state_t state) | |
1013 | { | |
1014 | int stopped; | |
1015 | ssize_t ret; | |
1016 | struct lxc_cmd_rr cmd = { | |
1017 | .req = { | |
1018 | .cmd = LXC_CMD_SERVE_STATE_CLIENTS, | |
1019 | .data = INT_TO_PTR(state) | |
1020 | }, | |
1021 | }; | |
1022 | ||
1023 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1024 | if (ret < 0) { | |
6d1400b5 | 1025 | SYSERROR("Failed to execute command"); |
974a8aba CB |
1026 | return -1; |
1027 | } | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | static int lxc_cmd_serve_state_clients_callback(int fd, struct lxc_cmd_req *req, | |
1033 | struct lxc_handler *handler) | |
1034 | { | |
1035 | int ret; | |
1036 | lxc_state_t state = PTR_TO_INT(req->data); | |
1037 | struct lxc_cmd_rsp rsp = {0}; | |
1038 | ||
1039 | ret = lxc_serve_state_clients(handler->name, handler, state); | |
1040 | if (ret < 0) | |
1041 | goto reap_client_fd; | |
1042 | ||
1043 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1044 | if (ret < 0) | |
1045 | goto reap_client_fd; | |
1046 | ||
1047 | return 0; | |
1048 | ||
1049 | reap_client_fd: | |
1050 | /* Special indicator to lxc_cmd_handler() to close the fd and do related | |
1051 | * cleanup. | |
1052 | */ | |
1053 | return 1; | |
1054 | } | |
1055 | ||
ef6e34ee | 1056 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
ded1d23f | 1057 | struct lxc_handler *handler) |
724e753c | 1058 | { |
ef6e34ee DE |
1059 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *); |
1060 | ||
1061 | callback cb[LXC_CMD_MAX] = { | |
974a8aba | 1062 | [LXC_CMD_CONSOLE] = lxc_cmd_console_callback, |
8ccbbf94 | 1063 | [LXC_CMD_TERMINAL_WINCH] = lxc_cmd_terminal_winch_callback, |
974a8aba CB |
1064 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, |
1065 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1066 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1067 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1068 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1069 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1070 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1071 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1072 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
1073 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, | |
1074 | [LXC_CMD_SERVE_STATE_CLIENTS] = lxc_cmd_serve_state_clients_callback, | |
724e753c MN |
1075 | }; |
1076 | ||
f371aca9 | 1077 | if (req->cmd >= LXC_CMD_MAX) { |
fe84a562 | 1078 | ERROR("Undefined command id %d", req->cmd); |
724e753c | 1079 | return -1; |
ef6e34ee DE |
1080 | } |
1081 | return cb[req->cmd](fd, req, handler); | |
724e753c MN |
1082 | } |
1083 | ||
ef6e34ee | 1084 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
f6fc1565 CB |
1085 | struct lxc_epoll_descr *descr, |
1086 | const lxc_cmd_t cmd) | |
724e753c | 1087 | { |
d39b10eb | 1088 | struct lxc_state_client *client; |
f6fc1565 CB |
1089 | struct lxc_list *cur, *next; |
1090 | ||
3dfe6f8d | 1091 | lxc_terminal_free(handler->conf, fd); |
724e753c | 1092 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 CB |
1093 | if (cmd != LXC_CMD_ADD_STATE_CLIENT) { |
1094 | close(fd); | |
1095 | return; | |
1096 | } | |
1097 | ||
d39b10eb | 1098 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
f6fc1565 CB |
1099 | client = cur->elem; |
1100 | if (client->clientfd != fd) | |
1101 | continue; | |
1102 | ||
1103 | /* kick client from list */ | |
f6fc1565 | 1104 | lxc_list_del(cur); |
300d1cb4 | 1105 | close(client->clientfd); |
f6fc1565 CB |
1106 | free(cur->elem); |
1107 | free(cur); | |
b1ca434a CB |
1108 | /* No need to walk the whole list. If we found the state client |
1109 | * fd there can't be a second one. | |
1110 | */ | |
1111 | break; | |
f6fc1565 | 1112 | } |
724e753c MN |
1113 | } |
1114 | ||
84c92abd DE |
1115 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1116 | struct lxc_epoll_descr *descr) | |
724e753c MN |
1117 | { |
1118 | int ret; | |
ef6e34ee | 1119 | struct lxc_cmd_req req; |
191d43cc | 1120 | void *reqdata = NULL; |
724e753c MN |
1121 | struct lxc_handler *handler = data; |
1122 | ||
aae93dd3 | 1123 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
ded1d23f | 1124 | if (ret < 0) { |
fe84a562 | 1125 | SYSERROR("Failed to receive data on command socket for command " |
9044b79e | 1126 | "\"%s\"", lxc_cmd_str(req.cmd)); |
1127 | ||
1128 | if (errno == EACCES) { | |
1129 | /* We don't care for the peer, just send and close. */ | |
1130 | struct lxc_cmd_rsp rsp = {.ret = ret}; | |
1131 | ||
1132 | lxc_cmd_rsp_send(fd, &rsp); | |
1133 | } | |
1134 | ||
724e753c MN |
1135 | goto out_close; |
1136 | } | |
1137 | ||
fe84a562 | 1138 | if (ret == 0) |
724e753c | 1139 | goto out_close; |
724e753c | 1140 | |
ef6e34ee | 1141 | if (ret != sizeof(req)) { |
c01c2be6 | 1142 | WARN("Failed to receive full command request. Ignoring request " |
fe84a562 | 1143 | "for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1144 | ret = -1; |
1145 | goto out_close; | |
1146 | } | |
1147 | ||
191d43cc CB |
1148 | if ((req.datalen > LXC_CMD_DATA_MAX) && |
1149 | (req.cmd != LXC_CMD_CONSOLE_LOG)) { | |
c01c2be6 | 1150 | ERROR("Received command data length %d is too large for " |
fe84a562 CB |
1151 | "command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); |
1152 | errno = EFBIG; | |
1153 | ret = -EFBIG; | |
724e753c MN |
1154 | goto out_close; |
1155 | } | |
1156 | ||
ef6e34ee | 1157 | if (req.datalen > 0) { |
191d43cc CB |
1158 | /* LXC_CMD_CONSOLE_LOG needs to be able to allocate data |
1159 | * that exceeds LXC_CMD_DATA_MAX: use malloc() for that. | |
1160 | */ | |
1161 | if (req.cmd == LXC_CMD_CONSOLE_LOG) | |
1162 | reqdata = malloc(req.datalen); | |
1163 | else | |
1164 | reqdata = alloca(req.datalen); | |
1165 | if (!reqdata) { | |
1166 | ERROR("Failed to allocate memory for \"%s\" command", | |
1167 | lxc_cmd_str(req.cmd)); | |
1168 | errno = ENOMEM; | |
1169 | ret = -ENOMEM; | |
1170 | goto out_close; | |
1171 | } | |
ef6e34ee | 1172 | |
e3233f26 | 1173 | ret = lxc_recv_nointr(fd, reqdata, req.datalen, 0); |
ef6e34ee | 1174 | if (ret != req.datalen) { |
c01c2be6 | 1175 | WARN("Failed to receive full command request. Ignoring " |
fe84a562 | 1176 | "request for \"%s\"", lxc_cmd_str(req.cmd)); |
b2a48508 | 1177 | ret = LXC_MAINLOOP_ERROR; |
ef6e34ee DE |
1178 | goto out_close; |
1179 | } | |
fe84a562 | 1180 | |
ef6e34ee DE |
1181 | req.data = reqdata; |
1182 | } | |
1183 | ||
1184 | ret = lxc_cmd_process(fd, &req, handler); | |
724e753c | 1185 | if (ret) { |
fe84a562 | 1186 | /* This is not an error, but only a request to close fd. */ |
b2a48508 | 1187 | ret = LXC_MAINLOOP_CONTINUE; |
724e753c MN |
1188 | goto out_close; |
1189 | } | |
1190 | ||
1191 | out: | |
191d43cc CB |
1192 | if (req.cmd == LXC_CMD_CONSOLE_LOG && reqdata) |
1193 | free(reqdata); | |
1194 | ||
724e753c | 1195 | return ret; |
fe84a562 | 1196 | |
724e753c | 1197 | out_close: |
f6fc1565 | 1198 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
1199 | goto out; |
1200 | } | |
1201 | ||
84c92abd DE |
1202 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
1203 | struct lxc_epoll_descr *descr) | |
724e753c | 1204 | { |
fe84a562 CB |
1205 | int connection; |
1206 | int opt = 1, ret = -1; | |
724e753c MN |
1207 | |
1208 | connection = accept(fd, NULL, 0); | |
1209 | if (connection < 0) { | |
47903908 | 1210 | SYSERROR("Failed to accept connection to run command"); |
b2a48508 | 1211 | return LXC_MAINLOOP_ERROR; |
724e753c MN |
1212 | } |
1213 | ||
fe84a562 CB |
1214 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
1215 | if (ret < 0) { | |
1216 | SYSERROR("Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc DL |
1217 | goto out_close; |
1218 | } | |
1219 | ||
fe84a562 CB |
1220 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
1221 | if (ret < 0) { | |
1222 | SYSERROR("Failed to enable necessary credentials on command socket"); | |
724e753c MN |
1223 | goto out_close; |
1224 | } | |
1225 | ||
ef6e34ee | 1226 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
724e753c | 1227 | if (ret) { |
fe84a562 | 1228 | ERROR("Failed to add command handler"); |
724e753c MN |
1229 | goto out_close; |
1230 | } | |
1231 | ||
1232 | out: | |
1233 | return ret; | |
1234 | ||
1235 | out_close: | |
1236 | close(connection); | |
1237 | goto out; | |
1238 | } | |
1239 | ||
9dfa4041 | 1240 | int lxc_cmd_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 1241 | { |
5b46db1a | 1242 | int fd, ret; |
b1234129 | 1243 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
724e753c | 1244 | |
5b46db1a | 1245 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, NULL, suffix); |
fe84a562 | 1246 | if (ret < 0) |
9ba8130c | 1247 | return -1; |
5b46db1a | 1248 | TRACE("Creating abstract unix socket \"%s\"", &path[1]); |
724e753c | 1249 | |
aae93dd3 | 1250 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 1251 | if (fd < 0) { |
5b46db1a | 1252 | SYSERROR("Failed to create command socket %s", &path[1]); |
08aa08fe | 1253 | if (errno == EADDRINUSE) |
fe84a562 | 1254 | ERROR("Container \"%s\" appears to be already running", name); |
6d1400b5 | 1255 | |
724e753c MN |
1256 | return -1; |
1257 | } | |
1258 | ||
fe84a562 CB |
1259 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
1260 | if (ret < 0) { | |
1261 | SYSERROR("Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f DL |
1262 | close(fd); |
1263 | return -1; | |
1264 | } | |
1265 | ||
9dfa4041 | 1266 | return fd; |
d2e30e99 DE |
1267 | } |
1268 | ||
fe84a562 | 1269 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 1270 | struct lxc_handler *handler) |
d2e30e99 | 1271 | { |
fe84a562 CB |
1272 | int ret; |
1273 | int fd = handler->conf->maincmd_fd; | |
d2e30e99 | 1274 | |
ef6e34ee | 1275 | ret = lxc_mainloop_add_handler(descr, fd, lxc_cmd_accept, handler); |
fe84a562 CB |
1276 | if (ret < 0) { |
1277 | ERROR("Failed to add handler for command socket"); | |
724e753c MN |
1278 | close(fd); |
1279 | } | |
1280 | ||
1281 | return ret; | |
1282 | } |