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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" |
5265a60c | 51 | #include "memory_utils.h" |
dbc9832d | 52 | #include "monitor.h" |
fe84a562 | 53 | #include "start.h" |
0ed9b1bc | 54 | #include "terminal.h" |
fe84a562 | 55 | #include "utils.h" |
724e753c | 56 | |
ded1d23f | 57 | /* |
fe84a562 CB |
58 | * This file provides the different functions for clients to query/command the |
59 | * server. The client is typically some lxc tool and the server is typically the | |
60 | * container (ie. lxc-start). | |
ded1d23f | 61 | * |
fe84a562 CB |
62 | * Each command is transactional, the clients send a request to the server and |
63 | * the server answers the request with a message giving the request's status | |
64 | * (zero or a negative errno value). Both the request and response may contain | |
65 | * additional data. | |
ded1d23f | 66 | * |
fe84a562 CB |
67 | * Each command is wrapped in a ancillary message in order to pass a credential |
68 | * making possible to the server to check if the client is allowed to ask for | |
69 | * this command or not. | |
80bcb053 | 70 | * |
fe84a562 CB |
71 | * IMPORTANTLY: Note that semantics for current commands are fixed. If you wish |
72 | * to make any changes to how, say, LXC_CMD_GET_CONFIG_ITEM works by adding | |
73 | * information to the end of cmd.data, then you must introduce a new | |
74 | * LXC_CMD_GET_CONFIG_ITEM_V2 define with a new number. You may wish to also | |
75 | * mark LXC_CMD_GET_CONFIG_ITEM deprecated in commands.h. | |
80bcb053 SH |
76 | * |
77 | * This is necessary in order to avoid having a newly compiled lxc command | |
78 | * communicating with a running (old) monitor from crashing the running | |
79 | * container. | |
ded1d23f DL |
80 | */ |
81 | ||
ac2cecc4 | 82 | lxc_log_define(commands, lxc); |
724e753c | 83 | |
ef6e34ee | 84 | static const char *lxc_cmd_str(lxc_cmd_t cmd) |
724e753c | 85 | { |
fe84a562 | 86 | static const char *const cmdname[LXC_CMD_MAX] = { |
974a8aba | 87 | [LXC_CMD_CONSOLE] = "console", |
8ccbbf94 | 88 | [LXC_CMD_TERMINAL_WINCH] = "terminal_winch", |
974a8aba CB |
89 | [LXC_CMD_STOP] = "stop", |
90 | [LXC_CMD_GET_STATE] = "get_state", | |
91 | [LXC_CMD_GET_INIT_PID] = "get_init_pid", | |
92 | [LXC_CMD_GET_CLONE_FLAGS] = "get_clone_flags", | |
93 | [LXC_CMD_GET_CGROUP] = "get_cgroup", | |
94 | [LXC_CMD_GET_CONFIG_ITEM] = "get_config_item", | |
95 | [LXC_CMD_GET_NAME] = "get_name", | |
96 | [LXC_CMD_GET_LXCPATH] = "get_lxcpath", | |
97 | [LXC_CMD_ADD_STATE_CLIENT] = "add_state_client", | |
98 | [LXC_CMD_CONSOLE_LOG] = "console_log", | |
99 | [LXC_CMD_SERVE_STATE_CLIENTS] = "serve_state_clients", | |
ef6e34ee | 100 | }; |
724e753c | 101 | |
f371aca9 | 102 | if (cmd >= LXC_CMD_MAX) |
a8007512 | 103 | return "Invalid request"; |
fe84a562 | 104 | |
ef6e34ee DE |
105 | return cmdname[cmd]; |
106 | } | |
107 | ||
108 | /* | |
109 | * lxc_cmd_rsp_recv: Receive a response to a command | |
110 | * | |
111 | * @sock : the socket connected to the container | |
112 | * @cmd : command to put response in | |
113 | * | |
114 | * Returns the size of the response message or < 0 on failure | |
115 | * | |
116 | * Note that if the command response datalen > 0, then data is | |
117 | * a malloc()ed buffer and should be free()ed by the caller. If | |
118 | * the response data is <= a void * worth of data, it will be | |
119 | * stored directly in data and datalen will be 0. | |
120 | * | |
121 | * As a special case, the response for LXC_CMD_CONSOLE is created | |
0115f8fd DE |
122 | * here as it contains an fd for the master pty passed through the |
123 | * unix socket. | |
ef6e34ee DE |
124 | */ |
125 | static int lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) | |
126 | { | |
2945ea97 | 127 | int ret, rspfd; |
ef6e34ee DE |
128 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
129 | ||
ae467c54 | 130 | ret = lxc_abstract_unix_recv_fds(sock, &rspfd, 1, rsp, sizeof(*rsp)); |
ef6e34ee | 131 | if (ret < 0) { |
a24c5678 | 132 | SYSWARN("Failed to receive response for command \"%s\"", |
133 | lxc_cmd_str(cmd->req.cmd)); | |
134 | ||
6b7f85cb | 135 | if (errno == ECONNRESET) |
2a850b2c | 136 | return -1; |
6b7f85cb | 137 | |
ef6e34ee DE |
138 | return -1; |
139 | } | |
fe84a562 | 140 | TRACE("Command \"%s\" received response", lxc_cmd_str(cmd->req.cmd)); |
ef6e34ee DE |
141 | |
142 | if (cmd->req.cmd == LXC_CMD_CONSOLE) { | |
143 | struct lxc_cmd_console_rsp_data *rspdata; | |
144 | ||
0115f8fd DE |
145 | /* recv() returns 0 bytes when a tty cannot be allocated, |
146 | * rsp->ret is < 0 when the peer permission check failed | |
147 | */ | |
148 | if (ret == 0 || rsp->ret < 0) | |
149 | return 0; | |
150 | ||
ef6e34ee DE |
151 | rspdata = malloc(sizeof(*rspdata)); |
152 | if (!rspdata) { | |
2a850b2c | 153 | errno = ENOMEM; |
fe84a562 | 154 | ERROR("Failed to allocate response buffer for command \"%s\"", |
ef6e34ee | 155 | lxc_cmd_str(cmd->req.cmd)); |
2a850b2c | 156 | return -1; |
ef6e34ee | 157 | } |
2a850b2c | 158 | |
0115f8fd | 159 | rspdata->masterfd = rspfd; |
ef6e34ee DE |
160 | rspdata->ttynum = PTR_TO_INT(rsp->data); |
161 | rsp->data = rspdata; | |
162 | } | |
163 | ||
860e7c43 | 164 | if (rsp->datalen == 0) { |
fe84a562 | 165 | DEBUG("Response data length for command \"%s\" is 0", |
860e7c43 | 166 | lxc_cmd_str(cmd->req.cmd)); |
ae5c8b8e | 167 | return ret; |
860e7c43 | 168 | } |
fe84a562 | 169 | |
191d43cc CB |
170 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && |
171 | (cmd->req.cmd != LXC_CMD_CONSOLE_LOG)) { | |
2a850b2c CB |
172 | ERROR("Response data for command \"%s\" is too long: %d bytes > %d", |
173 | lxc_cmd_str(cmd->req.cmd), rsp->datalen, LXC_CMD_DATA_MAX); | |
174 | return -1; | |
2ac9aafc | 175 | } |
ef6e34ee | 176 | |
191d43cc CB |
177 | if (cmd->req.cmd == LXC_CMD_CONSOLE_LOG) { |
178 | rsp->data = malloc(rsp->datalen + 1); | |
179 | ((char *)rsp->data)[rsp->datalen] = '\0'; | |
180 | } else { | |
181 | rsp->data = malloc(rsp->datalen); | |
182 | } | |
ef6e34ee | 183 | if (!rsp->data) { |
fe84a562 | 184 | errno = ENOMEM; |
2a850b2c CB |
185 | ERROR("Failed to allocate response buffer for command \"%s\"", |
186 | lxc_cmd_str(cmd->req.cmd)); | |
187 | return -1; | |
ef6e34ee | 188 | } |
fe84a562 | 189 | |
2a850b2c | 190 | ret = lxc_recv_nointr(sock, rsp->data, rsp->datalen, 0); |
ef6e34ee | 191 | if (ret != rsp->datalen) { |
6d1400b5 | 192 | SYSERROR("Failed to receive response data for command \"%s\"", |
193 | lxc_cmd_str(cmd->req.cmd)); | |
2a850b2c | 194 | return -1; |
ef6e34ee | 195 | } |
724e753c MN |
196 | |
197 | return ret; | |
198 | } | |
199 | ||
ef6e34ee DE |
200 | /* |
201 | * lxc_cmd_rsp_send: Send a command response | |
202 | * | |
203 | * @fd : file descriptor of socket to send response on | |
204 | * @rsp : response to send | |
205 | * | |
206 | * Returns 0 on success, < 0 on failure | |
207 | */ | |
208 | static int lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) | |
209 | { | |
fe84a562 | 210 | ssize_t ret; |
ef6e34ee | 211 | |
7fbb15ec CB |
212 | errno = EMSGSIZE; |
213 | ret = lxc_send_nointr(fd, rsp, sizeof(*rsp), MSG_NOSIGNAL); | |
fe84a562 | 214 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) { |
6d1400b5 | 215 | SYSERROR("Failed to send command response %zd", ret); |
ef6e34ee DE |
216 | return -1; |
217 | } | |
218 | ||
a674dfe1 | 219 | if (!rsp->data || rsp->datalen <= 0) |
fe84a562 CB |
220 | return 0; |
221 | ||
7fbb15ec CB |
222 | errno = EMSGSIZE; |
223 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
fe84a562 | 224 | if (ret < 0 || ret != (ssize_t)rsp->datalen) { |
a24c5678 | 225 | SYSWARN("Failed to send command response data %zd", ret); |
fe84a562 | 226 | return -1; |
ef6e34ee | 227 | } |
fe84a562 | 228 | |
ef6e34ee DE |
229 | return 0; |
230 | } | |
231 | ||
c01c2be6 | 232 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 233 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 | 234 | { |
2a850b2c | 235 | int client_fd, saved_errno; |
fe84a562 | 236 | ssize_t ret = -1; |
c01c2be6 | 237 | |
9dfa4041 | 238 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
2a850b2c | 239 | if (client_fd < 0) |
fe84a562 | 240 | return -1; |
c01c2be6 | 241 | |
fe84a562 CB |
242 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
243 | sizeof(cmd->req)); | |
2a850b2c CB |
244 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) |
245 | goto on_error; | |
9044b79e | 246 | |
fe84a562 CB |
247 | if (cmd->req.datalen <= 0) |
248 | return client_fd; | |
c01c2be6 | 249 | |
7fbb15ec CB |
250 | errno = EMSGSIZE; |
251 | ret = lxc_send_nointr(client_fd, (void *)cmd->req.data, | |
252 | cmd->req.datalen, MSG_NOSIGNAL); | |
2a850b2c CB |
253 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) |
254 | goto on_error; | |
c01c2be6 | 255 | |
2a850b2c | 256 | return client_fd; |
c01c2be6 | 257 | |
2a850b2c CB |
258 | on_error: |
259 | saved_errno = errno; | |
260 | close(client_fd); | |
261 | errno = saved_errno; | |
c01c2be6 | 262 | |
2a850b2c | 263 | return -1; |
c01c2be6 CB |
264 | } |
265 | ||
ef6e34ee DE |
266 | /* |
267 | * lxc_cmd: Connect to the specified running container, send it a command | |
268 | * request and collect the response | |
269 | * | |
270 | * @name : name of container to connect to | |
1e8cfdf6 | 271 | * @cmd : command with initialized request to send |
ef6e34ee DE |
272 | * @stopped : output indicator if the container was not running |
273 | * @lxcpath : the lxcpath in which the container is running | |
274 | * | |
275 | * Returns the size of the response message on success, < 0 on failure | |
276 | * | |
277 | * Note that there is a special case for LXC_CMD_CONSOLE. For this command | |
278 | * the fd cannot be closed because it is used as a placeholder to indicate | |
279 | * that a particular tty slot is in use. The fd is also used as a signal to | |
280 | * the container that when the caller dies or closes the fd, the container | |
0115f8fd DE |
281 | * will notice the fd on its side of the socket in its mainloop select and |
282 | * then free the slot with lxc_cmd_fd_cleanup(). The socket fd will be | |
283 | * returned in the cmd response structure. | |
ef6e34ee DE |
284 | */ |
285 | static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped, | |
88556fd7 | 286 | const char *lxcpath, const char *hashed_sock_name) |
724e753c | 287 | { |
2a850b2c | 288 | int client_fd, saved_errno; |
fe84a562 | 289 | int ret = -1; |
dbc9832d CB |
290 | bool stay_connected = false; |
291 | ||
292 | if (cmd->req.cmd == LXC_CMD_CONSOLE || | |
54446942 | 293 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 294 | stay_connected = true; |
724e753c | 295 | |
0ecf64b5 SH |
296 | *stopped = 0; |
297 | ||
c01c2be6 CB |
298 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
299 | if (client_fd < 0) { | |
7874d81a | 300 | SYSTRACE("Command \"%s\" failed to connect command socket", |
301 | lxc_cmd_str(cmd->req.cmd)); | |
6a93ae77 | 302 | |
00e5ca13 | 303 | if (errno == ECONNREFUSED || errno == EPIPE) |
ef6e34ee | 304 | *stopped = 1; |
3f903c04 | 305 | |
2a850b2c | 306 | return -1; |
724e753c MN |
307 | } |
308 | ||
c01c2be6 | 309 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
2a850b2c | 310 | if (ret < 0 && errno == ECONNRESET) |
6b7f85cb | 311 | *stopped = 1; |
6a93ae77 | 312 | |
00e5ca13 CB |
313 | if (!stay_connected || ret <= 0) { |
314 | saved_errno = errno; | |
315 | close(client_fd); | |
316 | errno = saved_errno; | |
317 | return ret; | |
318 | } | |
fe84a562 | 319 | |
6403a667 | 320 | if (stay_connected) |
c01c2be6 | 321 | cmd->rsp.ret = client_fd; |
43eb6f29 | 322 | |
1362f2eb | 323 | return ret; |
724e753c MN |
324 | } |
325 | ||
b494d2dd SH |
326 | int lxc_try_cmd(const char *name, const char *lxcpath) |
327 | { | |
0ecf64b5 | 328 | int stopped, ret; |
b494d2dd SH |
329 | struct lxc_cmd_rr cmd = { |
330 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
331 | }; | |
332 | ||
88556fd7 | 333 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
334 | if (stopped) |
335 | return 0; | |
336 | if (ret > 0 && cmd.rsp.ret < 0) { | |
337 | errno = cmd.rsp.ret; | |
338 | return -1; | |
339 | } | |
340 | if (ret > 0) | |
341 | return 0; | |
342 | ||
fe84a562 CB |
343 | /* At this point we weren't denied access, and the container *was* |
344 | * started. There was some inexplicable error in the protocol. I'm not | |
345 | * clear on whether we should return -1 here, but we didn't receive a | |
346 | * -EACCES, so technically it's not that we're not allowed to control | |
347 | * the container - it's just not behaving. | |
b494d2dd SH |
348 | */ |
349 | return 0; | |
350 | } | |
351 | ||
cc4c0832 | 352 | /* Implementations of the commands and their callbacks */ |
ef6e34ee DE |
353 | |
354 | /* | |
355 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
356 | * | |
357 | * @name : name of container to connect to | |
358 | * @lxcpath : the lxcpath in which the container is running | |
359 | * | |
360 | * Returns the pid on success, < 0 on failure | |
361 | */ | |
362 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 363 | { |
0ecf64b5 | 364 | int ret, stopped; |
9234406b | 365 | intmax_t pid; |
ef6e34ee | 366 | struct lxc_cmd_rr cmd = { |
e8cd1208 CB |
367 | .req = { |
368 | .cmd = LXC_CMD_GET_INIT_PID | |
369 | }, | |
370 | .rsp = { | |
9234406b | 371 | .data = INTMAX_TO_PTR((intmax_t){-1}) |
e8cd1208 | 372 | } |
ef6e34ee DE |
373 | }; |
374 | ||
88556fd7 | 375 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 376 | if (ret < 0) |
8ed8a626 | 377 | return -1; |
ef6e34ee | 378 | |
9234406b CB |
379 | pid = PTR_TO_INTMAX(cmd.rsp.data); |
380 | if (pid < 0) | |
381 | return -1; | |
382 | ||
383 | /* We need to assume that pid_t can actually hold any pid given to us | |
384 | * by the kernel. If it can't it's a libc bug. | |
385 | */ | |
386 | return (pid_t)pid; | |
43eb6f29 DL |
387 | } |
388 | ||
ef6e34ee DE |
389 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
390 | struct lxc_handler *handler) | |
43eb6f29 | 391 | { |
54dcfd81 CB |
392 | intmax_t pid = handler->pid; |
393 | ||
9234406b | 394 | struct lxc_cmd_rsp rsp = { |
54dcfd81 | 395 | .data = INTMAX_TO_PTR(pid) |
9234406b | 396 | }; |
ef6e34ee DE |
397 | |
398 | return lxc_cmd_rsp_send(fd, &rsp); | |
43eb6f29 DL |
399 | } |
400 | ||
ef6e34ee DE |
401 | /* |
402 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
403 | * | |
404 | * @name : name of container to connect to | |
405 | * @lxcpath : the lxcpath in which the container is running | |
406 | * | |
407 | * Returns the clone flags on success, < 0 on failure | |
408 | */ | |
409 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
410 | { | |
0ecf64b5 | 411 | int ret, stopped; |
ef6e34ee DE |
412 | struct lxc_cmd_rr cmd = { |
413 | .req = { .cmd = LXC_CMD_GET_CLONE_FLAGS }, | |
414 | }; | |
415 | ||
88556fd7 | 416 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
417 | if (ret < 0) |
418 | return ret; | |
43eb6f29 | 419 | |
ef6e34ee DE |
420 | return PTR_TO_INT(cmd.rsp.data); |
421 | } | |
422 | ||
423 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
424 | struct lxc_handler *handler) | |
26b2d152 | 425 | { |
becad0ec | 426 | struct lxc_cmd_rsp rsp = { .data = INT_TO_PTR(handler->ns_clone_flags) }; |
ef6e34ee DE |
427 | |
428 | return lxc_cmd_rsp_send(fd, &rsp); | |
429 | } | |
430 | ||
431 | /* | |
432 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
433 | * particular subsystem. This is the cgroup path relative to the root | |
434 | * of the cgroup filesystem. | |
435 | * | |
ef6e34ee DE |
436 | * @name : name of container to connect to |
437 | * @lxcpath : the lxcpath in which the container is running | |
b98f7d6e | 438 | * @subsystem : the subsystem being asked about |
ef6e34ee DE |
439 | * |
440 | * Returns the path on success, NULL on failure. The caller must free() the | |
441 | * returned path. | |
442 | */ | |
b98f7d6e | 443 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, |
fe84a562 | 444 | const char *subsystem) |
ef6e34ee | 445 | { |
0ecf64b5 | 446 | int ret, stopped; |
ef6e34ee | 447 | struct lxc_cmd_rr cmd = { |
b98f7d6e SH |
448 | .req = { |
449 | .cmd = LXC_CMD_GET_CGROUP, | |
b98f7d6e | 450 | .data = subsystem, |
c2aed66d | 451 | .datalen = 0, |
b98f7d6e | 452 | }, |
26b2d152 MN |
453 | }; |
454 | ||
c2aed66d CB |
455 | cmd.req.data = subsystem; |
456 | cmd.req.datalen = 0; | |
457 | if (subsystem) | |
458 | cmd.req.datalen = strlen(subsystem) + 1; | |
459 | ||
88556fd7 | 460 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 461 | if (ret < 0) |
ef6e34ee DE |
462 | return NULL; |
463 | ||
fe84a562 | 464 | if (ret == 0) |
ef6e34ee | 465 | return NULL; |
ef6e34ee | 466 | |
fe84a562 | 467 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 468 | return NULL; |
3f903c04 | 469 | |
ef6e34ee DE |
470 | return cmd.rsp.data; |
471 | } | |
472 | ||
473 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
474 | struct lxc_handler *handler) | |
475 | { | |
4fb3cba5 | 476 | const char *path; |
fe84a562 | 477 | struct lxc_cmd_rsp rsp; |
2202afc9 | 478 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
b98f7d6e | 479 | |
c2aed66d | 480 | if (req->datalen > 0) |
2202afc9 | 481 | path = cgroup_ops->get_cgroup(cgroup_ops, req->data); |
c2aed66d | 482 | else |
2202afc9 | 483 | path = cgroup_ops->get_cgroup(cgroup_ops, NULL); |
b98f7d6e SH |
484 | if (!path) |
485 | return -1; | |
fe84a562 | 486 | |
4f17323e | 487 | rsp.ret = 0; |
fe84a562 CB |
488 | rsp.datalen = strlen(path) + 1; |
489 | rsp.data = (char *)path; | |
ef6e34ee DE |
490 | |
491 | return lxc_cmd_rsp_send(fd, &rsp); | |
492 | } | |
493 | ||
494 | /* | |
495 | * lxc_cmd_get_config_item: Get config item the running container | |
496 | * | |
497 | * @name : name of container to connect to | |
7fa3f2e9 | 498 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
499 | * @lxcpath : the lxcpath in which the container is running |
500 | * | |
501 | * Returns the item on success, NULL on failure. The caller must free() the | |
502 | * returned item. | |
503 | */ | |
504 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
505 | const char *lxcpath) | |
506 | { | |
0ecf64b5 | 507 | int ret, stopped; |
ef6e34ee DE |
508 | struct lxc_cmd_rr cmd = { |
509 | .req = { .cmd = LXC_CMD_GET_CONFIG_ITEM, | |
510 | .data = item, | |
fe84a562 | 511 | .datalen = strlen(item) + 1, |
ef6e34ee DE |
512 | }, |
513 | }; | |
514 | ||
88556fd7 | 515 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
516 | if (ret < 0) |
517 | return NULL; | |
518 | ||
519 | if (cmd.rsp.ret == 0) | |
520 | return cmd.rsp.data; | |
fe84a562 | 521 | |
ef6e34ee DE |
522 | return NULL; |
523 | } | |
524 | ||
525 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
526 | struct lxc_handler *handler) | |
527 | { | |
5265a60c | 528 | __do_free char *cidata = NULL; |
ef6e34ee | 529 | int cilen; |
30aec088 | 530 | struct lxc_config_t *item; |
fe84a562 | 531 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
532 | |
533 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 534 | item = lxc_get_config(req->data); |
30aec088 CB |
535 | if (!item) |
536 | goto err1; | |
fe84a562 | 537 | |
cccd2219 | 538 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
539 | if (cilen <= 0) |
540 | goto err1; | |
541 | ||
5265a60c | 542 | cidata = must_realloc(NULL, cilen + 1); |
cccd2219 | 543 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 544 | goto err1; |
fe84a562 | 545 | |
ef6e34ee DE |
546 | cidata[cilen] = '\0'; |
547 | rsp.data = cidata; | |
548 | rsp.datalen = cilen + 1; | |
549 | rsp.ret = 0; | |
550 | goto out; | |
551 | ||
552 | err1: | |
553 | rsp.ret = -1; | |
554 | out: | |
555 | return lxc_cmd_rsp_send(fd, &rsp); | |
556 | } | |
557 | ||
558 | /* | |
559 | * lxc_cmd_get_state: Get current state of the container | |
560 | * | |
561 | * @name : name of container to connect to | |
562 | * @lxcpath : the lxcpath in which the container is running | |
563 | * | |
564 | * Returns the state on success, < 0 on failure | |
565 | */ | |
dbc9832d | 566 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 567 | { |
0ecf64b5 | 568 | int ret, stopped; |
ef6e34ee DE |
569 | struct lxc_cmd_rr cmd = { |
570 | .req = { .cmd = LXC_CMD_GET_STATE } | |
571 | }; | |
26b2d152 | 572 | |
88556fd7 | 573 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 574 | if (ret < 0 && stopped) |
ef6e34ee DE |
575 | return STOPPED; |
576 | ||
577 | if (ret < 0) | |
26b2d152 | 578 | return -1; |
26b2d152 | 579 | |
ef6e34ee | 580 | if (!ret) { |
fe84a562 | 581 | WARN("Container \"%s\" has stopped before sending its state", name); |
ef6e34ee DE |
582 | return -1; |
583 | } | |
584 | ||
fe84a562 | 585 | DEBUG("Container \"%s\" is in \"%s\" state", name, |
ef6e34ee | 586 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); |
fe84a562 | 587 | |
ef6e34ee DE |
588 | return PTR_TO_INT(cmd.rsp.data); |
589 | } | |
590 | ||
591 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
592 | struct lxc_handler *handler) | |
593 | { | |
594 | struct lxc_cmd_rsp rsp = { .data = INT_TO_PTR(handler->state) }; | |
595 | ||
596 | return lxc_cmd_rsp_send(fd, &rsp); | |
597 | } | |
598 | ||
599 | /* | |
600 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
601 | * the processes running inside this container will be killed. | |
602 | * | |
603 | * @name : name of container to connect to | |
604 | * @lxcpath : the lxcpath in which the container is running | |
605 | * | |
606 | * Returns 0 on success, < 0 on failure | |
607 | */ | |
608 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
609 | { | |
0ecf64b5 | 610 | int ret, stopped; |
ef6e34ee DE |
611 | struct lxc_cmd_rr cmd = { |
612 | .req = { .cmd = LXC_CMD_STOP }, | |
613 | }; | |
614 | ||
88556fd7 | 615 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 616 | if (ret < 0) { |
ef6e34ee | 617 | if (stopped) { |
fe84a562 | 618 | INFO("Container \"%s\" is already stopped", name); |
ef6e34ee DE |
619 | return 0; |
620 | } | |
fe84a562 | 621 | |
26b2d152 MN |
622 | return -1; |
623 | } | |
624 | ||
fe84a562 CB |
625 | /* We do not expect any answer, because we wait for the connection to be |
626 | * closed. | |
95d5b147 SH |
627 | */ |
628 | if (ret > 0) { | |
6d1400b5 | 629 | errno = -cmd.rsp.ret; |
630 | SYSERROR("Failed to stop container \"%s\"", name); | |
26b2d152 MN |
631 | return -1; |
632 | } | |
633 | ||
fe84a562 | 634 | INFO("Container \"%s\" has stopped", name); |
ef6e34ee | 635 | return 0; |
26b2d152 MN |
636 | } |
637 | ||
ef6e34ee DE |
638 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
639 | struct lxc_handler *handler) | |
d5088cf2 | 640 | { |
ef6e34ee | 641 | struct lxc_cmd_rsp rsp; |
ef6e34ee | 642 | int stopsignal = SIGKILL; |
2202afc9 | 643 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ef6e34ee DE |
644 | |
645 | if (handler->conf->stopsignal) | |
646 | stopsignal = handler->conf->stopsignal; | |
647 | memset(&rsp, 0, sizeof(rsp)); | |
648 | rsp.ret = kill(handler->pid, stopsignal); | |
649 | if (!rsp.ret) { | |
fe84a562 | 650 | /* We can't just use lxc_unfreeze() since we are already in the |
4fb3cba5 DE |
651 | * context of handling the STOP cmd in lxc-start, and calling |
652 | * lxc_unfreeze() would do another cmd (GET_CGROUP) which would | |
fe84a562 | 653 | * deadlock us. |
4fb3cba5 | 654 | */ |
27a5132c | 655 | if (!cgroup_ops->get_cgroup(cgroup_ops, "freezer")) |
d18d43da SG |
656 | return 0; |
657 | ||
2202afc9 | 658 | if (cgroup_ops->unfreeze(cgroup_ops)) |
95d5b147 | 659 | return 0; |
fe84a562 CB |
660 | |
661 | ERROR("Failed to unfreeze container \"%s\"", handler->name); | |
ecfcb3f0 | 662 | rsp.ret = -1; |
ef6e34ee DE |
663 | } |
664 | ||
665 | return lxc_cmd_rsp_send(fd, &rsp); | |
666 | } | |
d5088cf2 | 667 | |
b5159817 | 668 | /* |
2bd158cc | 669 | * lxc_cmd_terminal_winch: noop |
b5159817 DE |
670 | * |
671 | * @name : name of container to connect to | |
672 | * @lxcpath : the lxcpath in which the container is running | |
673 | * | |
674 | * Returns 0 on success, < 0 on failure | |
675 | */ | |
8ccbbf94 | 676 | int lxc_cmd_terminal_winch(const char *name, const char *lxcpath) |
b5159817 | 677 | { |
b5159817 DE |
678 | return 0; |
679 | } | |
680 | ||
8ccbbf94 CB |
681 | static int lxc_cmd_terminal_winch_callback(int fd, struct lxc_cmd_req *req, |
682 | struct lxc_handler *handler) | |
b5159817 | 683 | { |
2bd158cc CB |
684 | /* should never be called */ |
685 | return -1; | |
b5159817 DE |
686 | } |
687 | ||
ef6e34ee DE |
688 | /* |
689 | * lxc_cmd_console: Open an fd to a tty in the container | |
690 | * | |
691 | * @name : name of container to connect to | |
692 | * @ttynum : in: the tty to open or -1 for next available | |
693 | * : out: the tty allocated | |
694 | * @fd : out: file descriptor for master side of pty | |
695 | * @lxcpath : the lxcpath in which the container is running | |
696 | * | |
0115f8fd | 697 | * Returns fd holding tty allocated on success, < 0 on failure |
ef6e34ee DE |
698 | */ |
699 | int lxc_cmd_console(const char *name, int *ttynum, int *fd, const char *lxcpath) | |
700 | { | |
0ecf64b5 | 701 | int ret, stopped; |
ef6e34ee DE |
702 | struct lxc_cmd_console_rsp_data *rspdata; |
703 | struct lxc_cmd_rr cmd = { | |
704 | .req = { .cmd = LXC_CMD_CONSOLE, .data = INT_TO_PTR(*ttynum) }, | |
705 | }; | |
d5088cf2 | 706 | |
88556fd7 | 707 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
708 | if (ret < 0) |
709 | return ret; | |
0115f8fd DE |
710 | |
711 | if (cmd.rsp.ret < 0) { | |
6d1400b5 | 712 | errno = -cmd.rsp.ret; |
713 | SYSERROR("Denied access to tty"); | |
ef6e34ee DE |
714 | ret = -1; |
715 | goto out; | |
716 | } | |
d5088cf2 | 717 | |
0115f8fd | 718 | if (ret == 0) { |
fe84a562 | 719 | ERROR("tty number %d invalid, busy or all ttys busy", *ttynum); |
0115f8fd | 720 | ret = -1; |
ef6e34ee DE |
721 | goto out; |
722 | } | |
ef6e34ee DE |
723 | |
724 | rspdata = cmd.rsp.data; | |
0115f8fd | 725 | if (rspdata->masterfd < 0) { |
fe84a562 | 726 | ERROR("Unable to allocate fd for tty %d", rspdata->ttynum); |
ef6e34ee DE |
727 | goto out; |
728 | } | |
729 | ||
fe84a562 | 730 | ret = cmd.rsp.ret; /* socket fd */ |
0115f8fd | 731 | *fd = rspdata->masterfd; |
ef6e34ee | 732 | *ttynum = rspdata->ttynum; |
fe84a562 CB |
733 | INFO("Alloced fd %d for tty %d via socket %d", *fd, rspdata->ttynum, ret); |
734 | ||
ef6e34ee DE |
735 | out: |
736 | free(cmd.rsp.data); | |
737 | return ret; | |
738 | } | |
739 | ||
740 | static int lxc_cmd_console_callback(int fd, struct lxc_cmd_req *req, | |
741 | struct lxc_handler *handler) | |
742 | { | |
fe84a562 | 743 | int masterfd, ret; |
ef6e34ee | 744 | struct lxc_cmd_rsp rsp; |
fe84a562 | 745 | int ttynum = PTR_TO_INT(req->data); |
ef6e34ee | 746 | |
c1ee47cd | 747 | masterfd = lxc_terminal_allocate(handler->conf, fd, &ttynum); |
b5159817 | 748 | if (masterfd < 0) |
ef6e34ee DE |
749 | goto out_close; |
750 | ||
ef6e34ee DE |
751 | memset(&rsp, 0, sizeof(rsp)); |
752 | rsp.data = INT_TO_PTR(ttynum); | |
fe84a562 CB |
753 | ret = lxc_abstract_unix_send_fds(fd, &masterfd, 1, &rsp, sizeof(rsp)); |
754 | if (ret < 0) { | |
9044b79e | 755 | SYSERROR("Failed to send tty to client"); |
3dfe6f8d | 756 | lxc_terminal_free(handler->conf, fd); |
ef6e34ee DE |
757 | goto out_close; |
758 | } | |
759 | ||
ef6e34ee DE |
760 | return 0; |
761 | ||
762 | out_close: | |
fe84a562 CB |
763 | /* Special indicator to lxc_cmd_handler() to close the fd and do |
764 | * related cleanup. | |
ef6e34ee DE |
765 | */ |
766 | return 1; | |
d5088cf2 CS |
767 | } |
768 | ||
88556fd7 ÇO |
769 | /* |
770 | * lxc_cmd_get_name: Returns the name of the container | |
771 | * | |
772 | * @hashed_sock_name: hashed socket name | |
773 | * | |
774 | * Returns the name on success, NULL on failure. | |
775 | */ | |
776 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
777 | { | |
778 | int ret, stopped; | |
779 | struct lxc_cmd_rr cmd = { | |
780 | .req = { .cmd = LXC_CMD_GET_NAME}, | |
781 | }; | |
782 | ||
783 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 784 | if (ret < 0) |
88556fd7 | 785 | return NULL; |
88556fd7 ÇO |
786 | |
787 | if (cmd.rsp.ret == 0) | |
788 | return cmd.rsp.data; | |
fe84a562 | 789 | |
88556fd7 ÇO |
790 | return NULL; |
791 | } | |
792 | ||
793 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
fe84a562 | 794 | struct lxc_handler *handler) |
88556fd7 ÇO |
795 | { |
796 | struct lxc_cmd_rsp rsp; | |
797 | ||
798 | memset(&rsp, 0, sizeof(rsp)); | |
799 | ||
f0ecc19d | 800 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
801 | rsp.datalen = strlen(handler->name) + 1; |
802 | rsp.ret = 0; | |
803 | ||
804 | return lxc_cmd_rsp_send(fd, &rsp); | |
805 | } | |
806 | ||
807 | /* | |
808 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
809 | * | |
810 | * @hashed_sock_name: hashed socket name | |
811 | * | |
812 | * Returns the lxcpath on success, NULL on failure. | |
813 | */ | |
814 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
815 | { | |
816 | int ret, stopped; | |
817 | struct lxc_cmd_rr cmd = { | |
818 | .req = { .cmd = LXC_CMD_GET_LXCPATH}, | |
819 | }; | |
724e753c | 820 | |
88556fd7 | 821 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 822 | if (ret < 0) |
88556fd7 | 823 | return NULL; |
88556fd7 ÇO |
824 | |
825 | if (cmd.rsp.ret == 0) | |
826 | return cmd.rsp.data; | |
fe84a562 | 827 | |
88556fd7 ÇO |
828 | return NULL; |
829 | } | |
830 | ||
831 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
832 | struct lxc_handler *handler) | |
833 | { | |
834 | struct lxc_cmd_rsp rsp; | |
835 | ||
836 | memset(&rsp, 0, sizeof(rsp)); | |
837 | ||
fe84a562 | 838 | rsp.ret = 0; |
88556fd7 ÇO |
839 | rsp.data = (char *)handler->lxcpath; |
840 | rsp.datalen = strlen(handler->lxcpath) + 1; | |
88556fd7 ÇO |
841 | |
842 | return lxc_cmd_rsp_send(fd, &rsp); | |
843 | } | |
ef6e34ee | 844 | |
54446942 | 845 | int lxc_cmd_add_state_client(const char *name, const char *lxcpath, |
92e35018 CB |
846 | lxc_state_t states[MAX_STATE], |
847 | int *state_client_fd) | |
dbc9832d | 848 | { |
bc631984 | 849 | int state, stopped; |
dbc9832d | 850 | ssize_t ret; |
dbc9832d CB |
851 | struct lxc_cmd_rr cmd = { |
852 | .req = { | |
54446942 | 853 | .cmd = LXC_CMD_ADD_STATE_CLIENT, |
dbc9832d CB |
854 | .data = states, |
855 | .datalen = (sizeof(lxc_state_t) * MAX_STATE) | |
856 | }, | |
857 | }; | |
858 | ||
dbc9832d | 859 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
860 | if (states[STOPPED] != 0 && stopped != 0) |
861 | return STOPPED; | |
862 | ||
dbc9832d | 863 | if (ret < 0) { |
f577e061 | 864 | if (errno != ECONNREFUSED) |
6d1400b5 | 865 | SYSERROR("Failed to execute command"); |
866 | ||
dbc9832d CB |
867 | return -1; |
868 | } | |
fe84a562 | 869 | |
dbc9832d CB |
870 | /* We should now be guaranteed to get an answer from the state sending |
871 | * function. | |
872 | */ | |
dbc9832d | 873 | if (cmd.rsp.ret < 0) { |
6d1400b5 | 874 | errno = -cmd.rsp.ret; |
875 | SYSERROR("Failed to receive socket fd"); | |
dbc9832d CB |
876 | return -1; |
877 | } | |
878 | ||
bc631984 CB |
879 | state = PTR_TO_INT(cmd.rsp.data); |
880 | if (state < MAX_STATE) { | |
44552fb2 CB |
881 | TRACE("Container is already in requested state %s", lxc_state2str(state)); |
882 | close(cmd.rsp.ret); | |
bc631984 CB |
883 | return state; |
884 | } | |
885 | ||
92e35018 | 886 | *state_client_fd = cmd.rsp.ret; |
bc631984 | 887 | TRACE("Added state client %d to state client list", cmd.rsp.ret); |
92e35018 | 888 | return MAX_STATE; |
dbc9832d CB |
889 | } |
890 | ||
54446942 CB |
891 | static int lxc_cmd_add_state_client_callback(int fd, struct lxc_cmd_req *req, |
892 | struct lxc_handler *handler) | |
dbc9832d | 893 | { |
44552fb2 | 894 | int ret; |
dbc9832d | 895 | struct lxc_cmd_rsp rsp = {0}; |
dbc9832d | 896 | |
fe84a562 | 897 | if (req->datalen < 0) |
44552fb2 | 898 | goto reap_client_fd; |
dbc9832d | 899 | |
71fc9c04 | 900 | if (req->datalen != (sizeof(lxc_state_t) * MAX_STATE)) |
44552fb2 | 901 | goto reap_client_fd; |
dbc9832d | 902 | |
fe84a562 | 903 | if (!req->data) |
44552fb2 | 904 | goto reap_client_fd; |
dbc9832d | 905 | |
c01c2be6 | 906 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 CB |
907 | if (rsp.ret < 0) |
908 | goto reap_client_fd; | |
909 | ||
bc631984 | 910 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 911 | |
44552fb2 CB |
912 | ret = lxc_cmd_rsp_send(fd, &rsp); |
913 | if (ret < 0) | |
914 | goto reap_client_fd; | |
915 | ||
916 | return 0; | |
917 | ||
918 | reap_client_fd: | |
919 | /* Special indicator to lxc_cmd_handler() to close the fd and do related | |
920 | * cleanup. | |
921 | */ | |
922 | return 1; | |
dbc9832d CB |
923 | } |
924 | ||
191d43cc CB |
925 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
926 | struct lxc_console_log *log) | |
927 | { | |
928 | int ret, stopped; | |
929 | struct lxc_cmd_console_log data; | |
930 | struct lxc_cmd_rr cmd; | |
931 | ||
932 | data.clear = log->clear; | |
933 | data.read = log->read; | |
934 | data.read_max = *log->read_max; | |
935 | ||
936 | cmd.req.cmd = LXC_CMD_CONSOLE_LOG; | |
937 | cmd.req.data = &data; | |
938 | cmd.req.datalen = sizeof(struct lxc_cmd_console_log); | |
939 | ||
940 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
941 | if (ret < 0) | |
942 | return ret; | |
943 | ||
944 | /* There is nothing to be read from the buffer. So clear any values we | |
945 | * where passed to clearly indicate to the user that nothing went wrong. | |
946 | */ | |
63b74cda | 947 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
948 | *log->read_max = 0; |
949 | log->data = NULL; | |
950 | } | |
951 | ||
952 | /* This is a proper error so don't touch any values we were passed. */ | |
953 | if (cmd.rsp.ret < 0) | |
954 | return cmd.rsp.ret; | |
955 | ||
956 | *log->read_max = cmd.rsp.datalen; | |
957 | log->data = cmd.rsp.data; | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
963 | struct lxc_handler *handler) | |
964 | { | |
965 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 966 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc CB |
967 | const struct lxc_cmd_console_log *log = req->data; |
968 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; | |
969 | ||
970 | rsp.ret = -EFAULT; | |
971 | rsp.datalen = 0; | |
972 | rsp.data = NULL; | |
28f3b1cd | 973 | if (buffer_size <= 0) |
191d43cc CB |
974 | goto out; |
975 | ||
5928191e CB |
976 | if (log->read || log->write_logfile) |
977 | rsp.datalen = lxc_ringbuf_used(buf); | |
978 | ||
191d43cc CB |
979 | if (log->read) |
980 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
981 | ||
982 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
983 | rsp.datalen = log->read_max; | |
984 | ||
985 | /* there's nothing to read */ | |
63b74cda | 986 | rsp.ret = -ENODATA; |
191d43cc | 987 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
988 | goto out; |
989 | ||
63b74cda | 990 | rsp.ret = 0; |
23e0d9af | 991 | if (log->clear) |
43366ca2 | 992 | lxc_ringbuf_clear(buf); /* clear the ringbuffer */ |
23e0d9af | 993 | else if (rsp.datalen > 0) |
191d43cc CB |
994 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
995 | ||
996 | out: | |
997 | return lxc_cmd_rsp_send(fd, &rsp); | |
998 | } | |
999 | ||
974a8aba CB |
1000 | int lxc_cmd_serve_state_clients(const char *name, const char *lxcpath, |
1001 | lxc_state_t state) | |
1002 | { | |
1003 | int stopped; | |
1004 | ssize_t ret; | |
1005 | struct lxc_cmd_rr cmd = { | |
1006 | .req = { | |
1007 | .cmd = LXC_CMD_SERVE_STATE_CLIENTS, | |
1008 | .data = INT_TO_PTR(state) | |
1009 | }, | |
1010 | }; | |
1011 | ||
1012 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1013 | if (ret < 0) { | |
6d1400b5 | 1014 | SYSERROR("Failed to execute command"); |
974a8aba CB |
1015 | return -1; |
1016 | } | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | static int lxc_cmd_serve_state_clients_callback(int fd, struct lxc_cmd_req *req, | |
1022 | struct lxc_handler *handler) | |
1023 | { | |
1024 | int ret; | |
1025 | lxc_state_t state = PTR_TO_INT(req->data); | |
1026 | struct lxc_cmd_rsp rsp = {0}; | |
1027 | ||
1028 | ret = lxc_serve_state_clients(handler->name, handler, state); | |
1029 | if (ret < 0) | |
1030 | goto reap_client_fd; | |
1031 | ||
1032 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1033 | if (ret < 0) | |
1034 | goto reap_client_fd; | |
1035 | ||
1036 | return 0; | |
1037 | ||
1038 | reap_client_fd: | |
1039 | /* Special indicator to lxc_cmd_handler() to close the fd and do related | |
1040 | * cleanup. | |
1041 | */ | |
1042 | return 1; | |
1043 | } | |
1044 | ||
ef6e34ee | 1045 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
ded1d23f | 1046 | struct lxc_handler *handler) |
724e753c | 1047 | { |
ef6e34ee DE |
1048 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *); |
1049 | ||
1050 | callback cb[LXC_CMD_MAX] = { | |
974a8aba | 1051 | [LXC_CMD_CONSOLE] = lxc_cmd_console_callback, |
8ccbbf94 | 1052 | [LXC_CMD_TERMINAL_WINCH] = lxc_cmd_terminal_winch_callback, |
974a8aba CB |
1053 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, |
1054 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1055 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1056 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1057 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1058 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1059 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1060 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1061 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
1062 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, | |
1063 | [LXC_CMD_SERVE_STATE_CLIENTS] = lxc_cmd_serve_state_clients_callback, | |
724e753c MN |
1064 | }; |
1065 | ||
f371aca9 | 1066 | if (req->cmd >= LXC_CMD_MAX) { |
fe84a562 | 1067 | ERROR("Undefined command id %d", req->cmd); |
724e753c | 1068 | return -1; |
ef6e34ee DE |
1069 | } |
1070 | return cb[req->cmd](fd, req, handler); | |
724e753c MN |
1071 | } |
1072 | ||
ef6e34ee | 1073 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
f6fc1565 CB |
1074 | struct lxc_epoll_descr *descr, |
1075 | const lxc_cmd_t cmd) | |
724e753c | 1076 | { |
f6fc1565 CB |
1077 | struct lxc_list *cur, *next; |
1078 | ||
3dfe6f8d | 1079 | lxc_terminal_free(handler->conf, fd); |
724e753c | 1080 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 CB |
1081 | if (cmd != LXC_CMD_ADD_STATE_CLIENT) { |
1082 | close(fd); | |
1083 | return; | |
1084 | } | |
1085 | ||
d39b10eb | 1086 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
2ebc7bde CB |
1087 | struct lxc_state_client *client = cur->elem; |
1088 | ||
f6fc1565 CB |
1089 | if (client->clientfd != fd) |
1090 | continue; | |
1091 | ||
1092 | /* kick client from list */ | |
f6fc1565 | 1093 | lxc_list_del(cur); |
300d1cb4 | 1094 | close(client->clientfd); |
f6fc1565 CB |
1095 | free(cur->elem); |
1096 | free(cur); | |
b1ca434a CB |
1097 | /* No need to walk the whole list. If we found the state client |
1098 | * fd there can't be a second one. | |
1099 | */ | |
1100 | break; | |
f6fc1565 | 1101 | } |
724e753c MN |
1102 | } |
1103 | ||
84c92abd DE |
1104 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1105 | struct lxc_epoll_descr *descr) | |
724e753c | 1106 | { |
5265a60c | 1107 | __do_free void *reqdata = NULL; |
724e753c | 1108 | int ret; |
ef6e34ee | 1109 | struct lxc_cmd_req req; |
724e753c MN |
1110 | struct lxc_handler *handler = data; |
1111 | ||
aae93dd3 | 1112 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
ded1d23f | 1113 | if (ret < 0) { |
fe84a562 | 1114 | SYSERROR("Failed to receive data on command socket for command " |
9044b79e | 1115 | "\"%s\"", lxc_cmd_str(req.cmd)); |
1116 | ||
1117 | if (errno == EACCES) { | |
1118 | /* We don't care for the peer, just send and close. */ | |
1119 | struct lxc_cmd_rsp rsp = {.ret = ret}; | |
1120 | ||
1121 | lxc_cmd_rsp_send(fd, &rsp); | |
1122 | } | |
1123 | ||
724e753c MN |
1124 | goto out_close; |
1125 | } | |
1126 | ||
fe84a562 | 1127 | if (ret == 0) |
724e753c | 1128 | goto out_close; |
724e753c | 1129 | |
ef6e34ee | 1130 | if (ret != sizeof(req)) { |
c01c2be6 | 1131 | WARN("Failed to receive full command request. Ignoring request " |
fe84a562 | 1132 | "for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1133 | ret = -1; |
1134 | goto out_close; | |
1135 | } | |
1136 | ||
191d43cc CB |
1137 | if ((req.datalen > LXC_CMD_DATA_MAX) && |
1138 | (req.cmd != LXC_CMD_CONSOLE_LOG)) { | |
c01c2be6 | 1139 | ERROR("Received command data length %d is too large for " |
fe84a562 CB |
1140 | "command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); |
1141 | errno = EFBIG; | |
1142 | ret = -EFBIG; | |
724e753c MN |
1143 | goto out_close; |
1144 | } | |
1145 | ||
ef6e34ee | 1146 | if (req.datalen > 0) { |
5265a60c | 1147 | reqdata = must_realloc(NULL, req.datalen); |
e3233f26 | 1148 | ret = lxc_recv_nointr(fd, reqdata, req.datalen, 0); |
ef6e34ee | 1149 | if (ret != req.datalen) { |
c01c2be6 | 1150 | WARN("Failed to receive full command request. Ignoring " |
fe84a562 | 1151 | "request for \"%s\"", lxc_cmd_str(req.cmd)); |
b2a48508 | 1152 | ret = LXC_MAINLOOP_ERROR; |
ef6e34ee DE |
1153 | goto out_close; |
1154 | } | |
fe84a562 | 1155 | |
ef6e34ee DE |
1156 | req.data = reqdata; |
1157 | } | |
1158 | ||
1159 | ret = lxc_cmd_process(fd, &req, handler); | |
724e753c | 1160 | if (ret) { |
fe84a562 | 1161 | /* This is not an error, but only a request to close fd. */ |
b2a48508 | 1162 | ret = LXC_MAINLOOP_CONTINUE; |
724e753c MN |
1163 | goto out_close; |
1164 | } | |
1165 | ||
1166 | out: | |
1167 | return ret; | |
fe84a562 | 1168 | |
724e753c | 1169 | out_close: |
f6fc1565 | 1170 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
1171 | goto out; |
1172 | } | |
1173 | ||
84c92abd DE |
1174 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
1175 | struct lxc_epoll_descr *descr) | |
724e753c | 1176 | { |
fe84a562 CB |
1177 | int connection; |
1178 | int opt = 1, ret = -1; | |
724e753c MN |
1179 | |
1180 | connection = accept(fd, NULL, 0); | |
1181 | if (connection < 0) { | |
47903908 | 1182 | SYSERROR("Failed to accept connection to run command"); |
b2a48508 | 1183 | return LXC_MAINLOOP_ERROR; |
724e753c MN |
1184 | } |
1185 | ||
fe84a562 CB |
1186 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
1187 | if (ret < 0) { | |
1188 | SYSERROR("Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc DL |
1189 | goto out_close; |
1190 | } | |
1191 | ||
fe84a562 CB |
1192 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
1193 | if (ret < 0) { | |
1194 | SYSERROR("Failed to enable necessary credentials on command socket"); | |
724e753c MN |
1195 | goto out_close; |
1196 | } | |
1197 | ||
ef6e34ee | 1198 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
724e753c | 1199 | if (ret) { |
fe84a562 | 1200 | ERROR("Failed to add command handler"); |
724e753c MN |
1201 | goto out_close; |
1202 | } | |
1203 | ||
1204 | out: | |
1205 | return ret; | |
1206 | ||
1207 | out_close: | |
1208 | close(connection); | |
1209 | goto out; | |
1210 | } | |
1211 | ||
9dfa4041 | 1212 | int lxc_cmd_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 1213 | { |
5b46db1a | 1214 | int fd, ret; |
b1234129 | 1215 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
724e753c | 1216 | |
5b46db1a | 1217 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, NULL, suffix); |
fe84a562 | 1218 | if (ret < 0) |
9ba8130c | 1219 | return -1; |
5b46db1a | 1220 | TRACE("Creating abstract unix socket \"%s\"", &path[1]); |
724e753c | 1221 | |
aae93dd3 | 1222 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 1223 | if (fd < 0) { |
5b46db1a | 1224 | SYSERROR("Failed to create command socket %s", &path[1]); |
08aa08fe | 1225 | if (errno == EADDRINUSE) |
fe84a562 | 1226 | ERROR("Container \"%s\" appears to be already running", name); |
6d1400b5 | 1227 | |
724e753c MN |
1228 | return -1; |
1229 | } | |
1230 | ||
fe84a562 CB |
1231 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
1232 | if (ret < 0) { | |
1233 | SYSERROR("Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f DL |
1234 | close(fd); |
1235 | return -1; | |
1236 | } | |
1237 | ||
9dfa4041 | 1238 | return fd; |
d2e30e99 DE |
1239 | } |
1240 | ||
fe84a562 | 1241 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 1242 | struct lxc_handler *handler) |
d2e30e99 | 1243 | { |
fe84a562 CB |
1244 | int ret; |
1245 | int fd = handler->conf->maincmd_fd; | |
d2e30e99 | 1246 | |
ef6e34ee | 1247 | ret = lxc_mainloop_add_handler(descr, fd, lxc_cmd_accept, handler); |
fe84a562 CB |
1248 | if (ret < 0) { |
1249 | ERROR("Failed to add handler for command socket"); | |
724e753c MN |
1250 | close(fd); |
1251 | } | |
1252 | ||
1253 | return ret; | |
1254 | } |