]>
Commit | Line | Data |
---|---|---|
cc73685d | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
724e753c | 2 | |
d38dd64a CB |
3 | #ifndef _GNU_SOURCE |
4 | #define _GNU_SOURCE 1 | |
5 | #endif | |
cf685555 | 6 | #include <caps.h> |
724e753c | 7 | #include <errno.h> |
91480a0f | 8 | #include <fcntl.h> |
fe84a562 | 9 | #include <malloc.h> |
37515ebd | 10 | #include <poll.h> |
fe84a562 CB |
11 | #include <signal.h> |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
fe84a562 | 14 | #include <sys/param.h> |
724e753c MN |
15 | #include <sys/socket.h> |
16 | #include <sys/un.h> | |
d38dd64a | 17 | #include <unistd.h> |
724e753c | 18 | |
fe84a562 | 19 | #include "af_unix.h" |
f2363e38 | 20 | #include "cgroup.h" |
2a63b5cb | 21 | #include "cgroups/cgroup2_devices.h" |
724e753c | 22 | #include "commands.h" |
bbf5cf35 | 23 | #include "commands_utils.h" |
fe84a562 | 24 | #include "conf.h" |
d38dd64a | 25 | #include "config.h" |
ef6e34ee | 26 | #include "confile.h" |
fe84a562 CB |
27 | #include "log.h" |
28 | #include "lxc.h" | |
dbc9832d | 29 | #include "lxclock.h" |
cdb2a47f | 30 | #include "lxcseccomp.h" |
724e753c | 31 | #include "mainloop.h" |
5265a60c | 32 | #include "memory_utils.h" |
dbc9832d | 33 | #include "monitor.h" |
fe84a562 | 34 | #include "start.h" |
0ed9b1bc | 35 | #include "terminal.h" |
fe84a562 | 36 | #include "utils.h" |
724e753c | 37 | |
ded1d23f | 38 | /* |
fe84a562 CB |
39 | * This file provides the different functions for clients to query/command the |
40 | * server. The client is typically some lxc tool and the server is typically the | |
41 | * container (ie. lxc-start). | |
ded1d23f | 42 | * |
fe84a562 CB |
43 | * Each command is transactional, the clients send a request to the server and |
44 | * the server answers the request with a message giving the request's status | |
45 | * (zero or a negative errno value). Both the request and response may contain | |
46 | * additional data. | |
ded1d23f | 47 | * |
fe84a562 CB |
48 | * Each command is wrapped in a ancillary message in order to pass a credential |
49 | * making possible to the server to check if the client is allowed to ask for | |
50 | * this command or not. | |
80bcb053 | 51 | * |
fe84a562 CB |
52 | * IMPORTANTLY: Note that semantics for current commands are fixed. If you wish |
53 | * to make any changes to how, say, LXC_CMD_GET_CONFIG_ITEM works by adding | |
54 | * information to the end of cmd.data, then you must introduce a new | |
55 | * LXC_CMD_GET_CONFIG_ITEM_V2 define with a new number. You may wish to also | |
56 | * mark LXC_CMD_GET_CONFIG_ITEM deprecated in commands.h. | |
80bcb053 SH |
57 | * |
58 | * This is necessary in order to avoid having a newly compiled lxc command | |
59 | * communicating with a running (old) monitor from crashing the running | |
60 | * container. | |
ded1d23f DL |
61 | */ |
62 | ||
ac2cecc4 | 63 | lxc_log_define(commands, lxc); |
724e753c | 64 | |
ef6e34ee | 65 | static const char *lxc_cmd_str(lxc_cmd_t cmd) |
724e753c | 66 | { |
fe84a562 | 67 | static const char *const cmdname[LXC_CMD_MAX] = { |
2a63b5cb CB |
68 | [LXC_CMD_CONSOLE] = "console", |
69 | [LXC_CMD_TERMINAL_WINCH] = "terminal_winch", | |
70 | [LXC_CMD_STOP] = "stop", | |
71 | [LXC_CMD_GET_STATE] = "get_state", | |
72 | [LXC_CMD_GET_INIT_PID] = "get_init_pid", | |
73 | [LXC_CMD_GET_CLONE_FLAGS] = "get_clone_flags", | |
74 | [LXC_CMD_GET_CGROUP] = "get_cgroup", | |
75 | [LXC_CMD_GET_CONFIG_ITEM] = "get_config_item", | |
76 | [LXC_CMD_GET_NAME] = "get_name", | |
77 | [LXC_CMD_GET_LXCPATH] = "get_lxcpath", | |
78 | [LXC_CMD_ADD_STATE_CLIENT] = "add_state_client", | |
79 | [LXC_CMD_CONSOLE_LOG] = "console_log", | |
80 | [LXC_CMD_SERVE_STATE_CLIENTS] = "serve_state_clients", | |
81 | [LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER] = "seccomp_notify_add_listener", | |
82 | [LXC_CMD_ADD_BPF_DEVICE_CGROUP] = "add_bpf_device_cgroup", | |
018051e3 CB |
83 | [LXC_CMD_FREEZE] = "freeze", |
84 | [LXC_CMD_UNFREEZE] = "unfreeze", | |
bad788b0 | 85 | [LXC_CMD_GET_CGROUP2_FD] = "get_cgroup2_fd", |
ef6e34ee | 86 | }; |
724e753c | 87 | |
f371aca9 | 88 | if (cmd >= LXC_CMD_MAX) |
a8007512 | 89 | return "Invalid request"; |
fe84a562 | 90 | |
ef6e34ee DE |
91 | return cmdname[cmd]; |
92 | } | |
93 | ||
94 | /* | |
95 | * lxc_cmd_rsp_recv: Receive a response to a command | |
96 | * | |
97 | * @sock : the socket connected to the container | |
98 | * @cmd : command to put response in | |
99 | * | |
100 | * Returns the size of the response message or < 0 on failure | |
101 | * | |
102 | * Note that if the command response datalen > 0, then data is | |
103 | * a malloc()ed buffer and should be free()ed by the caller. If | |
104 | * the response data is <= a void * worth of data, it will be | |
105 | * stored directly in data and datalen will be 0. | |
106 | * | |
107 | * As a special case, the response for LXC_CMD_CONSOLE is created | |
0115f8fd DE |
108 | * here as it contains an fd for the master pty passed through the |
109 | * unix socket. | |
ef6e34ee DE |
110 | */ |
111 | static int lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) | |
112 | { | |
23a917e5 CB |
113 | __do_close_prot_errno int fd_rsp = -EBADF; |
114 | int ret; | |
ef6e34ee DE |
115 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
116 | ||
23a917e5 CB |
117 | ret = lxc_abstract_unix_recv_fds(sock, &fd_rsp, 1, rsp, sizeof(*rsp)); |
118 | if (ret < 0) | |
119 | return log_warn_errno(-1, | |
120 | errno, "Failed to receive response for command \"%s\"", | |
121 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 122 | TRACE("Command \"%s\" received response", lxc_cmd_str(cmd->req.cmd)); |
ef6e34ee DE |
123 | |
124 | if (cmd->req.cmd == LXC_CMD_CONSOLE) { | |
125 | struct lxc_cmd_console_rsp_data *rspdata; | |
126 | ||
0115f8fd DE |
127 | /* recv() returns 0 bytes when a tty cannot be allocated, |
128 | * rsp->ret is < 0 when the peer permission check failed | |
129 | */ | |
130 | if (ret == 0 || rsp->ret < 0) | |
131 | return 0; | |
132 | ||
ef6e34ee | 133 | rspdata = malloc(sizeof(*rspdata)); |
23a917e5 CB |
134 | if (!rspdata) |
135 | return log_warn_errno(-1, | |
136 | ENOMEM, "Failed to receive response for command \"%s\"", | |
137 | lxc_cmd_str(cmd->req.cmd)); | |
2a850b2c | 138 | |
23a917e5 | 139 | rspdata->masterfd = move_fd(fd_rsp); |
ef6e34ee DE |
140 | rspdata->ttynum = PTR_TO_INT(rsp->data); |
141 | rsp->data = rspdata; | |
142 | } | |
143 | ||
23a917e5 CB |
144 | if (cmd->req.cmd == LXC_CMD_GET_CGROUP2_FD) { |
145 | int cgroup2_fd = move_fd(fd_rsp); | |
146 | rsp->data = INT_TO_PTR(cgroup2_fd); | |
860e7c43 | 147 | } |
fe84a562 | 148 | |
23a917e5 CB |
149 | if (rsp->datalen == 0) |
150 | return log_debug(ret, | |
151 | "Response data length for command \"%s\" is 0", | |
152 | lxc_cmd_str(cmd->req.cmd)); | |
153 | ||
191d43cc | 154 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && |
23a917e5 CB |
155 | (cmd->req.cmd != LXC_CMD_CONSOLE_LOG)) |
156 | return log_error(-1, "Response data for command \"%s\" is too long: %d bytes > %d", | |
157 | lxc_cmd_str(cmd->req.cmd), rsp->datalen, | |
158 | LXC_CMD_DATA_MAX); | |
ef6e34ee | 159 | |
191d43cc CB |
160 | if (cmd->req.cmd == LXC_CMD_CONSOLE_LOG) { |
161 | rsp->data = malloc(rsp->datalen + 1); | |
162 | ((char *)rsp->data)[rsp->datalen] = '\0'; | |
163 | } else { | |
164 | rsp->data = malloc(rsp->datalen); | |
165 | } | |
23a917e5 CB |
166 | if (!rsp->data) |
167 | return log_error_errno(-1, | |
168 | ENOMEM, "Failed to allocate response buffer for command \"%s\"", | |
169 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 170 | |
2a850b2c | 171 | ret = lxc_recv_nointr(sock, rsp->data, rsp->datalen, 0); |
23a917e5 CB |
172 | if (ret != rsp->datalen) |
173 | return log_error_errno(-1, | |
174 | errno, "Failed to receive response data for command \"%s\"", | |
175 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
176 | |
177 | return ret; | |
178 | } | |
179 | ||
ef6e34ee DE |
180 | /* |
181 | * lxc_cmd_rsp_send: Send a command response | |
182 | * | |
183 | * @fd : file descriptor of socket to send response on | |
184 | * @rsp : response to send | |
185 | * | |
186 | * Returns 0 on success, < 0 on failure | |
187 | */ | |
188 | static int lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) | |
189 | { | |
fe84a562 | 190 | ssize_t ret; |
ef6e34ee | 191 | |
7fbb15ec CB |
192 | errno = EMSGSIZE; |
193 | ret = lxc_send_nointr(fd, rsp, sizeof(*rsp), MSG_NOSIGNAL); | |
6c6497ea CB |
194 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) |
195 | return log_error_errno(-1, errno, "Failed to send command response %zd", ret); | |
ef6e34ee | 196 | |
a674dfe1 | 197 | if (!rsp->data || rsp->datalen <= 0) |
fe84a562 CB |
198 | return 0; |
199 | ||
7fbb15ec CB |
200 | errno = EMSGSIZE; |
201 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
6c6497ea CB |
202 | if (ret < 0 || ret != (ssize_t)rsp->datalen) |
203 | return log_warn_errno(-1, errno, "Failed to send command response data %zd", ret); | |
fe84a562 | 204 | |
ef6e34ee DE |
205 | return 0; |
206 | } | |
207 | ||
c01c2be6 | 208 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 209 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 | 210 | { |
e96f9291 | 211 | __do_close_prot_errno int client_fd = -EBADF; |
fe84a562 | 212 | ssize_t ret = -1; |
c01c2be6 | 213 | |
9dfa4041 | 214 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
2a850b2c | 215 | if (client_fd < 0) |
fe84a562 | 216 | return -1; |
c01c2be6 | 217 | |
fe84a562 CB |
218 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
219 | sizeof(cmd->req)); | |
2a850b2c | 220 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) |
e96f9291 | 221 | return -1; |
9044b79e | 222 | |
cdb2a47f CB |
223 | if (cmd->req.cmd == LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER) { |
224 | int notify_fd = PTR_TO_INT(cmd->req.data); | |
225 | ret = lxc_abstract_unix_send_fds(client_fd, ¬ify_fd, 1, NULL, 0); | |
226 | if (ret <= 0) | |
227 | return -1; | |
228 | } else { | |
229 | if (cmd->req.datalen <= 0) | |
230 | return move_fd(client_fd); | |
c01c2be6 | 231 | |
cdb2a47f CB |
232 | errno = EMSGSIZE; |
233 | ret = lxc_send_nointr(client_fd, (void *)cmd->req.data, | |
234 | cmd->req.datalen, MSG_NOSIGNAL); | |
235 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) | |
236 | return -1; | |
237 | } | |
c01c2be6 | 238 | |
240fecd0 | 239 | return move_fd(client_fd); |
c01c2be6 CB |
240 | } |
241 | ||
ef6e34ee DE |
242 | /* |
243 | * lxc_cmd: Connect to the specified running container, send it a command | |
244 | * request and collect the response | |
245 | * | |
246 | * @name : name of container to connect to | |
1e8cfdf6 | 247 | * @cmd : command with initialized request to send |
ef6e34ee DE |
248 | * @stopped : output indicator if the container was not running |
249 | * @lxcpath : the lxcpath in which the container is running | |
250 | * | |
251 | * Returns the size of the response message on success, < 0 on failure | |
252 | * | |
253 | * Note that there is a special case for LXC_CMD_CONSOLE. For this command | |
254 | * the fd cannot be closed because it is used as a placeholder to indicate | |
255 | * that a particular tty slot is in use. The fd is also used as a signal to | |
256 | * the container that when the caller dies or closes the fd, the container | |
0115f8fd DE |
257 | * will notice the fd on its side of the socket in its mainloop select and |
258 | * then free the slot with lxc_cmd_fd_cleanup(). The socket fd will be | |
259 | * returned in the cmd response structure. | |
ef6e34ee DE |
260 | */ |
261 | static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped, | |
88556fd7 | 262 | const char *lxcpath, const char *hashed_sock_name) |
724e753c | 263 | { |
c34ff119 | 264 | __do_close_prot_errno int client_fd = -EBADF; |
fe84a562 | 265 | int ret = -1; |
dbc9832d CB |
266 | bool stay_connected = false; |
267 | ||
268 | if (cmd->req.cmd == LXC_CMD_CONSOLE || | |
54446942 | 269 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 270 | stay_connected = true; |
724e753c | 271 | |
0ecf64b5 SH |
272 | *stopped = 0; |
273 | ||
c01c2be6 CB |
274 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
275 | if (client_fd < 0) { | |
00e5ca13 | 276 | if (errno == ECONNREFUSED || errno == EPIPE) |
ef6e34ee | 277 | *stopped = 1; |
3f903c04 | 278 | |
6c6497ea CB |
279 | return log_trace_errno(-1, errno, "Command \"%s\" failed to connect command socket", |
280 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
281 | } |
282 | ||
c01c2be6 | 283 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
2a850b2c | 284 | if (ret < 0 && errno == ECONNRESET) |
6b7f85cb | 285 | *stopped = 1; |
6a93ae77 | 286 | |
ea2a070b CB |
287 | TRACE("Opened new command socket connection fd %d for command \"%s\"", |
288 | client_fd, lxc_cmd_str(cmd->req.cmd)); | |
289 | ||
c34ff119 | 290 | if (stay_connected && ret > 0) |
240fecd0 | 291 | cmd->rsp.ret = move_fd(client_fd); |
43eb6f29 | 292 | |
1362f2eb | 293 | return ret; |
724e753c MN |
294 | } |
295 | ||
b494d2dd SH |
296 | int lxc_try_cmd(const char *name, const char *lxcpath) |
297 | { | |
0ecf64b5 | 298 | int stopped, ret; |
b494d2dd SH |
299 | struct lxc_cmd_rr cmd = { |
300 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
301 | }; | |
302 | ||
88556fd7 | 303 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
304 | if (stopped) |
305 | return 0; | |
306 | if (ret > 0 && cmd.rsp.ret < 0) { | |
307 | errno = cmd.rsp.ret; | |
308 | return -1; | |
309 | } | |
310 | if (ret > 0) | |
311 | return 0; | |
312 | ||
fe84a562 CB |
313 | /* At this point we weren't denied access, and the container *was* |
314 | * started. There was some inexplicable error in the protocol. I'm not | |
315 | * clear on whether we should return -1 here, but we didn't receive a | |
316 | * -EACCES, so technically it's not that we're not allowed to control | |
317 | * the container - it's just not behaving. | |
b494d2dd SH |
318 | */ |
319 | return 0; | |
320 | } | |
321 | ||
cc4c0832 | 322 | /* Implementations of the commands and their callbacks */ |
ef6e34ee DE |
323 | |
324 | /* | |
325 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
326 | * | |
327 | * @name : name of container to connect to | |
328 | * @lxcpath : the lxcpath in which the container is running | |
329 | * | |
330 | * Returns the pid on success, < 0 on failure | |
331 | */ | |
332 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 333 | { |
0ecf64b5 | 334 | int ret, stopped; |
565eb353 | 335 | pid_t pid = -1; |
ef6e34ee | 336 | struct lxc_cmd_rr cmd = { |
e8cd1208 CB |
337 | .req = { |
338 | .cmd = LXC_CMD_GET_INIT_PID | |
339 | }, | |
340 | .rsp = { | |
565eb353 | 341 | .data = PID_TO_PTR(pid) |
e8cd1208 | 342 | } |
ef6e34ee DE |
343 | }; |
344 | ||
88556fd7 | 345 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 346 | if (ret < 0) |
8ed8a626 | 347 | return -1; |
ef6e34ee | 348 | |
565eb353 | 349 | pid = PTR_TO_PID(cmd.rsp.data); |
9234406b CB |
350 | if (pid < 0) |
351 | return -1; | |
352 | ||
353 | /* We need to assume that pid_t can actually hold any pid given to us | |
354 | * by the kernel. If it can't it's a libc bug. | |
355 | */ | |
356 | return (pid_t)pid; | |
43eb6f29 DL |
357 | } |
358 | ||
ef6e34ee | 359 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
360 | struct lxc_handler *handler, |
361 | struct lxc_epoll_descr *descr) | |
43eb6f29 | 362 | { |
ea2a070b | 363 | int ret; |
9234406b | 364 | struct lxc_cmd_rsp rsp = { |
565eb353 | 365 | .data = PID_TO_PTR(handler->pid) |
9234406b | 366 | }; |
ef6e34ee | 367 | |
ea2a070b CB |
368 | ret = lxc_cmd_rsp_send(fd, &rsp); |
369 | if (ret < 0) | |
370 | return LXC_CMD_REAP_CLIENT_FD; | |
371 | ||
372 | return 0; | |
43eb6f29 DL |
373 | } |
374 | ||
ef6e34ee DE |
375 | /* |
376 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
377 | * | |
378 | * @name : name of container to connect to | |
379 | * @lxcpath : the lxcpath in which the container is running | |
380 | * | |
381 | * Returns the clone flags on success, < 0 on failure | |
382 | */ | |
383 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
384 | { | |
0ecf64b5 | 385 | int ret, stopped; |
ef6e34ee | 386 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
387 | .req = { |
388 | .cmd = LXC_CMD_GET_CLONE_FLAGS, | |
389 | }, | |
ef6e34ee DE |
390 | }; |
391 | ||
88556fd7 | 392 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
393 | if (ret < 0) |
394 | return ret; | |
43eb6f29 | 395 | |
ef6e34ee DE |
396 | return PTR_TO_INT(cmd.rsp.data); |
397 | } | |
398 | ||
399 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
400 | struct lxc_handler *handler, |
401 | struct lxc_epoll_descr *descr) | |
26b2d152 | 402 | { |
ea2a070b | 403 | int ret; |
6c6497ea CB |
404 | struct lxc_cmd_rsp rsp = { |
405 | .data = INT_TO_PTR(handler->ns_clone_flags), | |
406 | }; | |
ef6e34ee | 407 | |
ea2a070b CB |
408 | ret = lxc_cmd_rsp_send(fd, &rsp); |
409 | if (ret < 0) | |
410 | return LXC_CMD_REAP_CLIENT_FD; | |
411 | ||
412 | return 0; | |
ef6e34ee DE |
413 | } |
414 | ||
415 | /* | |
416 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
417 | * particular subsystem. This is the cgroup path relative to the root | |
418 | * of the cgroup filesystem. | |
419 | * | |
ef6e34ee DE |
420 | * @name : name of container to connect to |
421 | * @lxcpath : the lxcpath in which the container is running | |
b98f7d6e | 422 | * @subsystem : the subsystem being asked about |
ef6e34ee DE |
423 | * |
424 | * Returns the path on success, NULL on failure. The caller must free() the | |
425 | * returned path. | |
426 | */ | |
b98f7d6e | 427 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, |
fe84a562 | 428 | const char *subsystem) |
ef6e34ee | 429 | { |
0ecf64b5 | 430 | int ret, stopped; |
ef6e34ee | 431 | struct lxc_cmd_rr cmd = { |
b98f7d6e SH |
432 | .req = { |
433 | .cmd = LXC_CMD_GET_CGROUP, | |
b98f7d6e | 434 | .data = subsystem, |
c2aed66d | 435 | .datalen = 0, |
b98f7d6e | 436 | }, |
26b2d152 MN |
437 | }; |
438 | ||
c2aed66d CB |
439 | cmd.req.data = subsystem; |
440 | cmd.req.datalen = 0; | |
441 | if (subsystem) | |
442 | cmd.req.datalen = strlen(subsystem) + 1; | |
443 | ||
88556fd7 | 444 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 445 | if (ret < 0) |
ef6e34ee DE |
446 | return NULL; |
447 | ||
fe84a562 | 448 | if (ret == 0) |
ef6e34ee | 449 | return NULL; |
ef6e34ee | 450 | |
fe84a562 | 451 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 452 | return NULL; |
3f903c04 | 453 | |
ef6e34ee DE |
454 | return cmd.rsp.data; |
455 | } | |
456 | ||
457 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
458 | struct lxc_handler *handler, |
459 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 460 | { |
ea2a070b | 461 | int ret; |
4fb3cba5 | 462 | const char *path; |
fe84a562 | 463 | struct lxc_cmd_rsp rsp; |
2202afc9 | 464 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
b98f7d6e | 465 | |
c2aed66d | 466 | if (req->datalen > 0) |
2202afc9 | 467 | path = cgroup_ops->get_cgroup(cgroup_ops, req->data); |
c2aed66d | 468 | else |
2202afc9 | 469 | path = cgroup_ops->get_cgroup(cgroup_ops, NULL); |
b98f7d6e SH |
470 | if (!path) |
471 | return -1; | |
fe84a562 | 472 | |
4f17323e | 473 | rsp.ret = 0; |
fe84a562 CB |
474 | rsp.datalen = strlen(path) + 1; |
475 | rsp.data = (char *)path; | |
ef6e34ee | 476 | |
ea2a070b CB |
477 | ret = lxc_cmd_rsp_send(fd, &rsp); |
478 | if (ret < 0) | |
479 | return LXC_CMD_REAP_CLIENT_FD; | |
480 | ||
481 | return 0; | |
ef6e34ee DE |
482 | } |
483 | ||
484 | /* | |
485 | * lxc_cmd_get_config_item: Get config item the running container | |
486 | * | |
487 | * @name : name of container to connect to | |
7fa3f2e9 | 488 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
489 | * @lxcpath : the lxcpath in which the container is running |
490 | * | |
491 | * Returns the item on success, NULL on failure. The caller must free() the | |
492 | * returned item. | |
493 | */ | |
494 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
495 | const char *lxcpath) | |
496 | { | |
0ecf64b5 | 497 | int ret, stopped; |
ef6e34ee DE |
498 | struct lxc_cmd_rr cmd = { |
499 | .req = { .cmd = LXC_CMD_GET_CONFIG_ITEM, | |
500 | .data = item, | |
fe84a562 | 501 | .datalen = strlen(item) + 1, |
ef6e34ee DE |
502 | }, |
503 | }; | |
504 | ||
88556fd7 | 505 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
506 | if (ret < 0) |
507 | return NULL; | |
508 | ||
509 | if (cmd.rsp.ret == 0) | |
510 | return cmd.rsp.data; | |
fe84a562 | 511 | |
ef6e34ee DE |
512 | return NULL; |
513 | } | |
514 | ||
515 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
516 | struct lxc_handler *handler, |
517 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 518 | { |
5265a60c | 519 | __do_free char *cidata = NULL; |
ef6e34ee | 520 | int cilen; |
30aec088 | 521 | struct lxc_config_t *item; |
fe84a562 | 522 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
523 | |
524 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 525 | item = lxc_get_config(req->data); |
30aec088 CB |
526 | if (!item) |
527 | goto err1; | |
fe84a562 | 528 | |
cccd2219 | 529 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
530 | if (cilen <= 0) |
531 | goto err1; | |
532 | ||
5265a60c | 533 | cidata = must_realloc(NULL, cilen + 1); |
cccd2219 | 534 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 535 | goto err1; |
fe84a562 | 536 | |
ef6e34ee DE |
537 | cidata[cilen] = '\0'; |
538 | rsp.data = cidata; | |
539 | rsp.datalen = cilen + 1; | |
540 | rsp.ret = 0; | |
541 | goto out; | |
542 | ||
543 | err1: | |
544 | rsp.ret = -1; | |
545 | out: | |
ea2a070b CB |
546 | cilen = lxc_cmd_rsp_send(fd, &rsp); |
547 | if (cilen < 0) | |
548 | return LXC_CMD_REAP_CLIENT_FD; | |
549 | ||
550 | return 0; | |
ef6e34ee DE |
551 | } |
552 | ||
553 | /* | |
554 | * lxc_cmd_get_state: Get current state of the container | |
555 | * | |
556 | * @name : name of container to connect to | |
557 | * @lxcpath : the lxcpath in which the container is running | |
558 | * | |
559 | * Returns the state on success, < 0 on failure | |
560 | */ | |
dbc9832d | 561 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 562 | { |
0ecf64b5 | 563 | int ret, stopped; |
ef6e34ee | 564 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
565 | .req = { |
566 | .cmd = LXC_CMD_GET_STATE, | |
567 | }, | |
ef6e34ee | 568 | }; |
26b2d152 | 569 | |
88556fd7 | 570 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 571 | if (ret < 0 && stopped) |
ef6e34ee DE |
572 | return STOPPED; |
573 | ||
574 | if (ret < 0) | |
26b2d152 | 575 | return -1; |
26b2d152 | 576 | |
6c6497ea CB |
577 | if (!ret) |
578 | return log_warn(-1, "Container \"%s\" has stopped before sending its state", name); | |
fe84a562 | 579 | |
6c6497ea CB |
580 | return log_debug(PTR_TO_INT(cmd.rsp.data), |
581 | "Container \"%s\" is in \"%s\" state", name, | |
582 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); | |
ef6e34ee DE |
583 | } |
584 | ||
585 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
586 | struct lxc_handler *handler, |
587 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 588 | { |
ea2a070b | 589 | int ret; |
6c6497ea CB |
590 | struct lxc_cmd_rsp rsp = { |
591 | .data = INT_TO_PTR(handler->state), | |
592 | }; | |
ef6e34ee | 593 | |
ea2a070b CB |
594 | ret = lxc_cmd_rsp_send(fd, &rsp); |
595 | if (ret < 0) | |
596 | return LXC_CMD_REAP_CLIENT_FD; | |
597 | ||
598 | return 0; | |
ef6e34ee DE |
599 | } |
600 | ||
601 | /* | |
602 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
603 | * the processes running inside this container will be killed. | |
604 | * | |
605 | * @name : name of container to connect to | |
606 | * @lxcpath : the lxcpath in which the container is running | |
607 | * | |
608 | * Returns 0 on success, < 0 on failure | |
609 | */ | |
610 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
611 | { | |
0ecf64b5 | 612 | int ret, stopped; |
ef6e34ee | 613 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
614 | .req = { |
615 | .cmd = LXC_CMD_STOP, | |
616 | }, | |
ef6e34ee DE |
617 | }; |
618 | ||
88556fd7 | 619 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 620 | if (ret < 0) { |
6c6497ea CB |
621 | if (stopped) |
622 | return log_info(0, "Container \"%s\" is already stopped", name); | |
fe84a562 | 623 | |
26b2d152 MN |
624 | return -1; |
625 | } | |
626 | ||
fe84a562 CB |
627 | /* We do not expect any answer, because we wait for the connection to be |
628 | * closed. | |
95d5b147 | 629 | */ |
6c6497ea CB |
630 | if (ret > 0) |
631 | return log_error_errno(-1, -cmd.rsp.ret, "Failed to stop container \"%s\"", name); | |
26b2d152 | 632 | |
6c6497ea | 633 | return log_info(0, "Container \"%s\" has stopped", name); |
26b2d152 MN |
634 | } |
635 | ||
ef6e34ee | 636 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
637 | struct lxc_handler *handler, |
638 | struct lxc_epoll_descr *descr) | |
d5088cf2 | 639 | { |
ef6e34ee | 640 | struct lxc_cmd_rsp rsp; |
ef6e34ee | 641 | int stopsignal = SIGKILL; |
2202afc9 | 642 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ea2a070b | 643 | int ret; |
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) { | |
018051e3 CB |
650 | rsp.ret = cgroup_ops->unfreeze(cgroup_ops, -1); |
651 | if (!rsp.ret) | |
95d5b147 | 652 | return 0; |
fe84a562 CB |
653 | |
654 | ERROR("Failed to unfreeze container \"%s\"", handler->name); | |
018051e3 CB |
655 | rsp.ret = -errno; |
656 | } else { | |
657 | rsp.ret = -errno; | |
ef6e34ee DE |
658 | } |
659 | ||
ea2a070b CB |
660 | ret = lxc_cmd_rsp_send(fd, &rsp); |
661 | if (ret < 0) | |
662 | return LXC_CMD_REAP_CLIENT_FD; | |
663 | ||
664 | return 0; | |
ef6e34ee | 665 | } |
d5088cf2 | 666 | |
b5159817 | 667 | /* |
2bd158cc | 668 | * lxc_cmd_terminal_winch: noop |
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 | { |
b5159817 DE |
677 | return 0; |
678 | } | |
679 | ||
8ccbbf94 | 680 | static int lxc_cmd_terminal_winch_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
681 | struct lxc_handler *handler, |
682 | struct lxc_epoll_descr *descr) | |
b5159817 | 683 | { |
2bd158cc | 684 | /* should never be called */ |
6c6497ea | 685 | return log_error_errno(-1, ENOSYS, "Called lxc_cmd_terminal_winch_callback()"); |
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 | { | |
8259d86d | 701 | __do_free struct lxc_cmd_console_rsp_data *rspdata = NULL; |
0ecf64b5 | 702 | int ret, stopped; |
ef6e34ee | 703 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
704 | .req = { |
705 | .cmd = LXC_CMD_CONSOLE, | |
706 | .data = INT_TO_PTR(*ttynum), | |
707 | }, | |
ef6e34ee | 708 | }; |
d5088cf2 | 709 | |
88556fd7 | 710 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
711 | if (ret < 0) |
712 | return ret; | |
0115f8fd | 713 | |
8259d86d | 714 | rspdata = cmd.rsp.data; |
6c6497ea CB |
715 | if (cmd.rsp.ret < 0) |
716 | return log_error_errno(-1, -cmd.rsp.ret, "Denied access to tty"); | |
d5088cf2 | 717 | |
6c6497ea CB |
718 | if (ret == 0) |
719 | return log_error(-1, "tty number %d invalid, busy or all ttys busy", *ttynum); | |
ef6e34ee | 720 | |
6c6497ea CB |
721 | if (rspdata->masterfd < 0) |
722 | return log_error(-1, "Unable to allocate fd for tty %d", rspdata->ttynum); | |
ef6e34ee | 723 | |
fe84a562 | 724 | ret = cmd.rsp.ret; /* socket fd */ |
0115f8fd | 725 | *fd = rspdata->masterfd; |
ef6e34ee | 726 | *ttynum = rspdata->ttynum; |
fe84a562 | 727 | |
6c6497ea | 728 | return log_info(ret, "Alloced fd %d for tty %d via socket %d", *fd, rspdata->ttynum, ret); |
ef6e34ee DE |
729 | } |
730 | ||
731 | static int lxc_cmd_console_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
732 | struct lxc_handler *handler, |
733 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 734 | { |
fe84a562 | 735 | int masterfd, ret; |
ef6e34ee | 736 | struct lxc_cmd_rsp rsp; |
fe84a562 | 737 | int ttynum = PTR_TO_INT(req->data); |
ef6e34ee | 738 | |
c1ee47cd | 739 | masterfd = lxc_terminal_allocate(handler->conf, fd, &ttynum); |
b5159817 | 740 | if (masterfd < 0) |
ea2a070b | 741 | return LXC_CMD_REAP_CLIENT_FD; |
ef6e34ee | 742 | |
ef6e34ee DE |
743 | memset(&rsp, 0, sizeof(rsp)); |
744 | rsp.data = INT_TO_PTR(ttynum); | |
fe84a562 CB |
745 | ret = lxc_abstract_unix_send_fds(fd, &masterfd, 1, &rsp, sizeof(rsp)); |
746 | if (ret < 0) { | |
3dfe6f8d | 747 | lxc_terminal_free(handler->conf, fd); |
ea2a070b CB |
748 | return log_error_errno(LXC_CMD_REAP_CLIENT_FD, errno, |
749 | "Failed to send tty to client"); | |
ef6e34ee DE |
750 | } |
751 | ||
ef6e34ee | 752 | return 0; |
d5088cf2 CS |
753 | } |
754 | ||
88556fd7 ÇO |
755 | /* |
756 | * lxc_cmd_get_name: Returns the name of the container | |
757 | * | |
758 | * @hashed_sock_name: hashed socket name | |
759 | * | |
760 | * Returns the name on success, NULL on failure. | |
761 | */ | |
762 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
763 | { | |
764 | int ret, stopped; | |
765 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
766 | .req = { |
767 | .cmd = LXC_CMD_GET_NAME, | |
768 | }, | |
88556fd7 ÇO |
769 | }; |
770 | ||
771 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 772 | if (ret < 0) |
88556fd7 | 773 | return NULL; |
88556fd7 ÇO |
774 | |
775 | if (cmd.rsp.ret == 0) | |
776 | return cmd.rsp.data; | |
fe84a562 | 777 | |
88556fd7 ÇO |
778 | return NULL; |
779 | } | |
780 | ||
781 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
782 | struct lxc_handler *handler, |
783 | struct lxc_epoll_descr *descr) | |
88556fd7 | 784 | { |
ea2a070b | 785 | int ret; |
88556fd7 ÇO |
786 | struct lxc_cmd_rsp rsp; |
787 | ||
788 | memset(&rsp, 0, sizeof(rsp)); | |
789 | ||
f0ecc19d | 790 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
791 | rsp.datalen = strlen(handler->name) + 1; |
792 | rsp.ret = 0; | |
793 | ||
ea2a070b CB |
794 | ret = lxc_cmd_rsp_send(fd, &rsp); |
795 | if (ret < 0) | |
796 | return LXC_CMD_REAP_CLIENT_FD; | |
797 | ||
798 | return 0; | |
88556fd7 ÇO |
799 | } |
800 | ||
801 | /* | |
802 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
803 | * | |
804 | * @hashed_sock_name: hashed socket name | |
805 | * | |
806 | * Returns the lxcpath on success, NULL on failure. | |
807 | */ | |
808 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
809 | { | |
810 | int ret, stopped; | |
811 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
812 | .req = { |
813 | .cmd = LXC_CMD_GET_LXCPATH, | |
814 | }, | |
88556fd7 | 815 | }; |
724e753c | 816 | |
88556fd7 | 817 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 818 | if (ret < 0) |
88556fd7 | 819 | return NULL; |
88556fd7 ÇO |
820 | |
821 | if (cmd.rsp.ret == 0) | |
822 | return cmd.rsp.data; | |
fe84a562 | 823 | |
88556fd7 ÇO |
824 | return NULL; |
825 | } | |
826 | ||
827 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
828 | struct lxc_handler *handler, |
829 | struct lxc_epoll_descr *descr) | |
88556fd7 | 830 | { |
ea2a070b | 831 | int ret; |
6c6497ea CB |
832 | struct lxc_cmd_rsp rsp = { |
833 | .ret = 0, | |
834 | .data = (char *)handler->lxcpath, | |
835 | .datalen = strlen(handler->lxcpath) + 1, | |
836 | }; | |
88556fd7 | 837 | |
ea2a070b CB |
838 | ret = lxc_cmd_rsp_send(fd, &rsp); |
839 | if (ret < 0) | |
840 | return LXC_CMD_REAP_CLIENT_FD; | |
841 | ||
842 | return 0; | |
88556fd7 | 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 | { |
cd889e57 | 849 | __do_close_prot_errno int clientfd = -EBADF; |
bc631984 | 850 | int state, stopped; |
dbc9832d | 851 | ssize_t ret; |
dbc9832d | 852 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
853 | .req = { |
854 | .cmd = LXC_CMD_ADD_STATE_CLIENT, | |
855 | .data = states, | |
856 | .datalen = (sizeof(lxc_state_t) * MAX_STATE) | |
857 | }, | |
dbc9832d CB |
858 | }; |
859 | ||
dbc9832d | 860 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
861 | if (states[STOPPED] != 0 && stopped != 0) |
862 | return STOPPED; | |
863 | ||
dbc9832d | 864 | if (ret < 0) { |
f577e061 | 865 | if (errno != ECONNREFUSED) |
6d1400b5 | 866 | SYSERROR("Failed to execute command"); |
867 | ||
dbc9832d CB |
868 | return -1; |
869 | } | |
fe84a562 | 870 | |
dbc9832d CB |
871 | /* We should now be guaranteed to get an answer from the state sending |
872 | * function. | |
873 | */ | |
cd889e57 | 874 | clientfd = cmd.rsp.ret; |
6c6497ea CB |
875 | if (clientfd < 0) |
876 | return log_error_errno(-1, -clientfd, "Failed to receive socket fd"); | |
dbc9832d | 877 | |
bc631984 | 878 | state = PTR_TO_INT(cmd.rsp.data); |
6c6497ea CB |
879 | if (state < MAX_STATE) |
880 | return log_trace(state, "Container is already in requested state %s", lxc_state2str(state)); | |
bc631984 | 881 | |
240fecd0 | 882 | *state_client_fd = move_fd(clientfd); |
ea2a070b CB |
883 | TRACE("State connection fd %d ready to listen for container state changes", *state_client_fd); |
884 | return MAX_STATE; | |
dbc9832d CB |
885 | } |
886 | ||
ebbca852 | 887 | static int lxc_cmd_add_state_client_callback(__owns int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
888 | struct lxc_handler *handler, |
889 | struct lxc_epoll_descr *descr) | |
dbc9832d | 890 | { |
44552fb2 | 891 | int ret; |
dbc9832d | 892 | struct lxc_cmd_rsp rsp = {0}; |
dbc9832d | 893 | |
fe84a562 | 894 | if (req->datalen < 0) |
ea2a070b | 895 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 896 | |
71fc9c04 | 897 | if (req->datalen != (sizeof(lxc_state_t) * MAX_STATE)) |
ea2a070b | 898 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 899 | |
fe84a562 | 900 | if (!req->data) |
ea2a070b | 901 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 902 | |
c01c2be6 | 903 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 | 904 | if (rsp.ret < 0) |
ea2a070b | 905 | return LXC_CMD_REAP_CLIENT_FD; |
44552fb2 | 906 | |
bc631984 | 907 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 908 | |
44552fb2 CB |
909 | ret = lxc_cmd_rsp_send(fd, &rsp); |
910 | if (ret < 0) | |
ea2a070b | 911 | return LXC_CMD_REAP_CLIENT_FD; |
44552fb2 CB |
912 | |
913 | return 0; | |
dbc9832d CB |
914 | } |
915 | ||
2a63b5cb CB |
916 | int lxc_cmd_add_bpf_device_cgroup(const char *name, const char *lxcpath, |
917 | struct device_item *device) | |
918 | { | |
919 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
920 | int stopped = 0; | |
921 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
922 | .req = { |
923 | .cmd = LXC_CMD_ADD_BPF_DEVICE_CGROUP, | |
924 | .data = device, | |
925 | .datalen = sizeof(struct device_item), | |
926 | }, | |
2a63b5cb CB |
927 | }; |
928 | int ret; | |
929 | ||
930 | if (strlen(device->access) > STRLITERALLEN("rwm")) | |
3d0327ed | 931 | return log_error_errno(-1, EINVAL, "Invalid access mode specified %s", |
2a63b5cb CB |
932 | device->access); |
933 | ||
934 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
935 | if (ret < 0 || cmd.rsp.ret < 0) | |
3d0327ed | 936 | return log_error_errno(-1, errno, "Failed to add new bpf device cgroup rule"); |
2a63b5cb CB |
937 | |
938 | return 0; | |
939 | #else | |
3d0327ed | 940 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
941 | #endif |
942 | } | |
943 | ||
944 | static int lxc_cmd_add_bpf_device_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
945 | struct lxc_handler *handler, | |
946 | struct lxc_epoll_descr *descr) | |
947 | { | |
948 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
949 | __do_bpf_program_free struct bpf_program *devices = NULL; | |
950 | struct lxc_cmd_rsp rsp = {0}; | |
951 | struct lxc_conf *conf = handler->conf; | |
952 | struct hierarchy *unified = handler->cgroup_ops->unified; | |
2a63b5cb CB |
953 | int ret; |
954 | struct lxc_list *it; | |
955 | struct device_item *device; | |
956 | struct bpf_program *devices_old; | |
957 | ||
958 | if (req->datalen <= 0) | |
ea2a070b | 959 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
960 | |
961 | if (req->datalen != sizeof(struct device_item)) | |
ea2a070b | 962 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
963 | |
964 | if (!req->data) | |
ea2a070b | 965 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
966 | device = (struct device_item *)req->data; |
967 | ||
968 | rsp.ret = -1; | |
969 | if (!unified) | |
970 | goto respond; | |
971 | ||
972 | ret = bpf_list_add_device(conf, device); | |
973 | if (ret < 0) | |
974 | goto respond; | |
975 | ||
976 | devices = bpf_program_new(BPF_PROG_TYPE_CGROUP_DEVICE); | |
977 | if (!devices) | |
978 | goto respond; | |
979 | ||
980 | ret = bpf_program_init(devices); | |
981 | if (ret) | |
982 | goto respond; | |
983 | ||
984 | lxc_list_for_each(it, &conf->devices) { | |
985 | struct device_item *cur = it->elem; | |
986 | ||
987 | ret = bpf_program_append_device(devices, cur); | |
988 | if (ret) | |
989 | goto respond; | |
990 | } | |
991 | ||
992 | ret = bpf_program_finalize(devices); | |
993 | if (ret) | |
994 | goto respond; | |
995 | ||
996 | ret = bpf_program_cgroup_attach(devices, BPF_CGROUP_DEVICE, | |
997 | unified->container_full_path, | |
998 | BPF_F_ALLOW_MULTI); | |
999 | if (ret) | |
1000 | goto respond; | |
1001 | ||
1002 | /* Replace old bpf program. */ | |
1003 | devices_old = move_ptr(conf->cgroup2_devices); | |
1004 | conf->cgroup2_devices = move_ptr(devices); | |
1005 | devices = move_ptr(devices_old); | |
1006 | ||
1007 | rsp.ret = 0; | |
1008 | ||
1009 | respond: | |
1010 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1011 | if (ret < 0) | |
ea2a070b | 1012 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1013 | |
1014 | return 0; | |
2a63b5cb | 1015 | #else |
3d0327ed | 1016 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
1017 | #endif |
1018 | } | |
1019 | ||
191d43cc CB |
1020 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
1021 | struct lxc_console_log *log) | |
1022 | { | |
1023 | int ret, stopped; | |
1024 | struct lxc_cmd_console_log data; | |
1025 | struct lxc_cmd_rr cmd; | |
1026 | ||
1027 | data.clear = log->clear; | |
1028 | data.read = log->read; | |
1029 | data.read_max = *log->read_max; | |
1030 | ||
1031 | cmd.req.cmd = LXC_CMD_CONSOLE_LOG; | |
1032 | cmd.req.data = &data; | |
1033 | cmd.req.datalen = sizeof(struct lxc_cmd_console_log); | |
1034 | ||
1035 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1036 | if (ret < 0) | |
1037 | return ret; | |
1038 | ||
1039 | /* There is nothing to be read from the buffer. So clear any values we | |
1040 | * where passed to clearly indicate to the user that nothing went wrong. | |
1041 | */ | |
63b74cda | 1042 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
1043 | *log->read_max = 0; |
1044 | log->data = NULL; | |
1045 | } | |
1046 | ||
1047 | /* This is a proper error so don't touch any values we were passed. */ | |
1048 | if (cmd.rsp.ret < 0) | |
1049 | return cmd.rsp.ret; | |
1050 | ||
1051 | *log->read_max = cmd.rsp.datalen; | |
1052 | log->data = cmd.rsp.data; | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1058 | struct lxc_handler *handler, |
1059 | struct lxc_epoll_descr *descr) | |
191d43cc CB |
1060 | { |
1061 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 1062 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc CB |
1063 | const struct lxc_cmd_console_log *log = req->data; |
1064 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; | |
1065 | ||
1066 | rsp.ret = -EFAULT; | |
1067 | rsp.datalen = 0; | |
1068 | rsp.data = NULL; | |
28f3b1cd | 1069 | if (buffer_size <= 0) |
191d43cc CB |
1070 | goto out; |
1071 | ||
5928191e CB |
1072 | if (log->read || log->write_logfile) |
1073 | rsp.datalen = lxc_ringbuf_used(buf); | |
1074 | ||
191d43cc CB |
1075 | if (log->read) |
1076 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
1077 | ||
1078 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
1079 | rsp.datalen = log->read_max; | |
1080 | ||
1081 | /* there's nothing to read */ | |
63b74cda | 1082 | rsp.ret = -ENODATA; |
191d43cc | 1083 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
1084 | goto out; |
1085 | ||
63b74cda | 1086 | rsp.ret = 0; |
23e0d9af | 1087 | if (log->clear) |
43366ca2 | 1088 | lxc_ringbuf_clear(buf); /* clear the ringbuffer */ |
23e0d9af | 1089 | else if (rsp.datalen > 0) |
191d43cc CB |
1090 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
1091 | ||
1092 | out: | |
1093 | return lxc_cmd_rsp_send(fd, &rsp); | |
1094 | } | |
1095 | ||
974a8aba CB |
1096 | int lxc_cmd_serve_state_clients(const char *name, const char *lxcpath, |
1097 | lxc_state_t state) | |
1098 | { | |
1099 | int stopped; | |
1100 | ssize_t ret; | |
1101 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
1102 | .req = { |
1103 | .cmd = LXC_CMD_SERVE_STATE_CLIENTS, | |
1104 | .data = INT_TO_PTR(state) | |
1105 | }, | |
974a8aba CB |
1106 | }; |
1107 | ||
1108 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1109 | if (ret < 0) |
1110 | return log_error_errno(-1, errno, "Failed to serve state clients"); | |
974a8aba CB |
1111 | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static int lxc_cmd_serve_state_clients_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1116 | struct lxc_handler *handler, |
1117 | struct lxc_epoll_descr *descr) | |
974a8aba CB |
1118 | { |
1119 | int ret; | |
1120 | lxc_state_t state = PTR_TO_INT(req->data); | |
1121 | struct lxc_cmd_rsp rsp = {0}; | |
1122 | ||
1123 | ret = lxc_serve_state_clients(handler->name, handler, state); | |
1124 | if (ret < 0) | |
ea2a070b | 1125 | return LXC_CMD_REAP_CLIENT_FD; |
974a8aba CB |
1126 | |
1127 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1128 | if (ret < 0) | |
ea2a070b | 1129 | return LXC_CMD_REAP_CLIENT_FD; |
974a8aba CB |
1130 | |
1131 | return 0; | |
974a8aba CB |
1132 | } |
1133 | ||
cdb2a47f CB |
1134 | int lxc_cmd_seccomp_notify_add_listener(const char *name, const char *lxcpath, |
1135 | int fd, | |
1136 | /* unused */ unsigned int command, | |
1137 | /* unused */ unsigned int flags) | |
1138 | { | |
1139 | ||
c3e3c21a | 1140 | #ifdef HAVE_SECCOMP_NOTIFY |
cdb2a47f CB |
1141 | int ret, stopped; |
1142 | struct lxc_cmd_rr cmd = { | |
1143 | .req = { | |
1144 | .cmd = LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER, | |
1145 | .data = INT_TO_PTR(fd), | |
1146 | }, | |
1147 | }; | |
1148 | ||
1149 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1150 | if (ret < 0) |
1151 | return log_error_errno(-1, errno, "Failed to add seccomp listener"); | |
cdb2a47f CB |
1152 | |
1153 | return cmd.rsp.ret; | |
1154 | #else | |
3d0327ed | 1155 | return ret_set_errno(-1, ENOSYS); |
cdb2a47f CB |
1156 | #endif |
1157 | } | |
1158 | ||
1159 | static int lxc_cmd_seccomp_notify_add_listener_callback(int fd, | |
1160 | struct lxc_cmd_req *req, | |
1161 | struct lxc_handler *handler, | |
1162 | struct lxc_epoll_descr *descr) | |
1163 | { | |
1164 | struct lxc_cmd_rsp rsp = {0}; | |
cdb2a47f | 1165 | |
c3e3c21a CB |
1166 | #ifdef HAVE_SECCOMP_NOTIFY |
1167 | int ret; | |
cdb2a47f | 1168 | __do_close_prot_errno int recv_fd = -EBADF; |
cdb2a47f | 1169 | |
c3e3c21a CB |
1170 | ret = lxc_abstract_unix_recv_fds(fd, &recv_fd, 1, NULL, 0); |
1171 | if (ret <= 0) { | |
1172 | rsp.ret = -errno; | |
1173 | goto out; | |
cdb2a47f CB |
1174 | } |
1175 | ||
c3e3c21a CB |
1176 | if (!handler->conf->seccomp.notifier.wants_supervision || |
1177 | handler->conf->seccomp.notifier.proxy_fd < 0) { | |
1178 | SYSERROR("No seccomp proxy fd specified"); | |
1179 | rsp.ret = -EINVAL; | |
1180 | goto out; | |
1181 | } | |
cdb2a47f | 1182 | |
c3e3c21a | 1183 | ret = lxc_mainloop_add_handler(descr, recv_fd, seccomp_notify_handler, |
cdb2a47f | 1184 | handler); |
c3e3c21a CB |
1185 | if (ret < 0) { |
1186 | rsp.ret = -errno; | |
1187 | goto out; | |
1188 | } | |
68a9e3eb | 1189 | move_fd(recv_fd); |
cdb2a47f | 1190 | |
c3e3c21a | 1191 | out: |
cdb2a47f CB |
1192 | #else |
1193 | rsp.ret = -ENOSYS; | |
cdb2a47f | 1194 | |
c3e3c21a CB |
1195 | #endif |
1196 | return lxc_cmd_rsp_send(fd, &rsp); | |
cdb2a47f CB |
1197 | } |
1198 | ||
018051e3 CB |
1199 | int lxc_cmd_freeze(const char *name, const char *lxcpath, int timeout) |
1200 | { | |
1201 | int ret, stopped; | |
1202 | struct lxc_cmd_rr cmd = { | |
1203 | .req = { | |
1204 | .cmd = LXC_CMD_FREEZE, | |
1205 | .data = INT_TO_PTR(timeout), | |
1206 | }, | |
1207 | }; | |
1208 | ||
1209 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1210 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1211 | return log_error_errno(-1, errno, "Failed to freeze container"); |
018051e3 CB |
1212 | |
1213 | return cmd.rsp.ret; | |
1214 | } | |
1215 | ||
1216 | static int lxc_cmd_freeze_callback(int fd, struct lxc_cmd_req *req, | |
1217 | struct lxc_handler *handler, | |
1218 | struct lxc_epoll_descr *descr) | |
1219 | { | |
1220 | int timeout = PTR_TO_INT(req->data); | |
1221 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1222 | .ret = -ENOENT, |
018051e3 CB |
1223 | }; |
1224 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1225 | ||
1973b62a | 1226 | if (pure_unified_layout(ops)) |
018051e3 CB |
1227 | rsp.ret = ops->freeze(ops, timeout); |
1228 | ||
1229 | return lxc_cmd_rsp_send(fd, &rsp); | |
1230 | } | |
1231 | ||
1232 | int lxc_cmd_unfreeze(const char *name, const char *lxcpath, int timeout) | |
1233 | { | |
1234 | int ret, stopped; | |
1235 | struct lxc_cmd_rr cmd = { | |
1236 | .req = { | |
1237 | .cmd = LXC_CMD_UNFREEZE, | |
1238 | .data = INT_TO_PTR(timeout), | |
1239 | }, | |
1240 | }; | |
1241 | ||
1242 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1243 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1244 | return log_error_errno(-1, errno, "Failed to unfreeze container"); |
018051e3 CB |
1245 | |
1246 | return cmd.rsp.ret; | |
1247 | } | |
1248 | ||
1249 | static int lxc_cmd_unfreeze_callback(int fd, struct lxc_cmd_req *req, | |
1250 | struct lxc_handler *handler, | |
1251 | struct lxc_epoll_descr *descr) | |
1252 | { | |
1253 | int timeout = PTR_TO_INT(req->data); | |
1254 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1255 | .ret = -ENOENT, |
018051e3 CB |
1256 | }; |
1257 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1258 | ||
1973b62a | 1259 | if (pure_unified_layout(ops)) |
018051e3 CB |
1260 | rsp.ret = ops->unfreeze(ops, timeout); |
1261 | ||
1262 | return lxc_cmd_rsp_send(fd, &rsp); | |
1263 | } | |
1264 | ||
bad788b0 CB |
1265 | int lxc_cmd_get_cgroup2_fd(const char *name, const char *lxcpath) |
1266 | { | |
1267 | int ret, stopped; | |
1268 | struct lxc_cmd_rr cmd = { | |
1269 | .req = { | |
1270 | .cmd = LXC_CMD_GET_CGROUP2_FD, | |
1271 | }, | |
1272 | }; | |
1273 | ||
1274 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
23a917e5 CB |
1275 | if (ret < 0) |
1276 | return -1; | |
1277 | ||
1278 | if (cmd.rsp.ret < 0) | |
900b6606 | 1279 | return log_debug_errno(-1, errno, "Failed to receive cgroup2 fd"); |
bad788b0 CB |
1280 | |
1281 | return PTR_TO_INT(cmd.rsp.data); | |
1282 | } | |
1283 | ||
1284 | static int lxc_cmd_get_cgroup2_fd_callback(int fd, struct lxc_cmd_req *req, | |
1285 | struct lxc_handler *handler, | |
1286 | struct lxc_epoll_descr *descr) | |
1287 | { | |
1288 | struct lxc_cmd_rsp rsp = { | |
1289 | .ret = -EINVAL, | |
1290 | }; | |
1291 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1292 | int ret; | |
1293 | ||
1973b62a | 1294 | if (!pure_unified_layout(ops) || !ops->unified) |
bad788b0 CB |
1295 | return lxc_cmd_rsp_send(fd, &rsp); |
1296 | ||
1297 | rsp.ret = 0; | |
1973b62a | 1298 | ret = lxc_abstract_unix_send_fds(fd, &ops->unified->cgfd_con, 1, &rsp, |
bad788b0 CB |
1299 | sizeof(rsp)); |
1300 | if (ret < 0) | |
a804c19b | 1301 | return log_error(LXC_CMD_REAP_CLIENT_FD, "Failed to send cgroup2 fd"); |
bad788b0 CB |
1302 | |
1303 | return 0; | |
1304 | } | |
1305 | ||
ef6e34ee | 1306 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1307 | struct lxc_handler *handler, |
1308 | struct lxc_epoll_descr *descr) | |
724e753c | 1309 | { |
cdb2a47f CB |
1310 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *, |
1311 | struct lxc_epoll_descr *); | |
ef6e34ee DE |
1312 | |
1313 | callback cb[LXC_CMD_MAX] = { | |
2a63b5cb CB |
1314 | [LXC_CMD_CONSOLE] = lxc_cmd_console_callback, |
1315 | [LXC_CMD_TERMINAL_WINCH] = lxc_cmd_terminal_winch_callback, | |
1316 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, | |
1317 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1318 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1319 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1320 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1321 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1322 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1323 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1324 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
1325 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, | |
1326 | [LXC_CMD_SERVE_STATE_CLIENTS] = lxc_cmd_serve_state_clients_callback, | |
1327 | [LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER] = lxc_cmd_seccomp_notify_add_listener_callback, | |
1328 | [LXC_CMD_ADD_BPF_DEVICE_CGROUP] = lxc_cmd_add_bpf_device_cgroup_callback, | |
018051e3 CB |
1329 | [LXC_CMD_FREEZE] = lxc_cmd_freeze_callback, |
1330 | [LXC_CMD_UNFREEZE] = lxc_cmd_unfreeze_callback, | |
bad788b0 | 1331 | [LXC_CMD_GET_CGROUP2_FD] = lxc_cmd_get_cgroup2_fd_callback, |
724e753c MN |
1332 | }; |
1333 | ||
23a917e5 CB |
1334 | if (req->cmd >= LXC_CMD_MAX) |
1335 | return log_error_errno(-1, ENOENT, "Undefined command id %d", req->cmd); | |
1336 | ||
cdb2a47f | 1337 | return cb[req->cmd](fd, req, handler, descr); |
724e753c MN |
1338 | } |
1339 | ||
ef6e34ee | 1340 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
cdb2a47f | 1341 | struct lxc_epoll_descr *descr, const lxc_cmd_t cmd) |
724e753c | 1342 | { |
3dfe6f8d | 1343 | lxc_terminal_free(handler->conf, fd); |
724e753c | 1344 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 | 1345 | |
cd5369b0 | 1346 | if (cmd == LXC_CMD_ADD_STATE_CLIENT) { |
ab92468c CB |
1347 | struct lxc_list *cur, *next; |
1348 | ||
cdb2a47f CB |
1349 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
1350 | struct lxc_state_client *client = cur->elem; | |
1351 | ||
1352 | if (client->clientfd != fd) | |
1353 | continue; | |
1354 | ||
ab92468c CB |
1355 | /* |
1356 | * Only kick client from list so it can't be found | |
1357 | * anymore. The actual close happens, as for all other | |
1358 | * file descriptors, below. | |
1359 | */ | |
cdb2a47f | 1360 | lxc_list_del(cur); |
cdb2a47f CB |
1361 | free(cur->elem); |
1362 | free(cur); | |
ab92468c | 1363 | |
39e2a438 CB |
1364 | /* |
1365 | * No need to walk the whole list. If we found the state | |
cdb2a47f CB |
1366 | * client fd there can't be a second one. |
1367 | */ | |
ea2a070b | 1368 | TRACE("Found state client fd %d in state client list for command \"%s\"", fd, lxc_cmd_str(cmd)); |
ab92468c | 1369 | break; |
cdb2a47f | 1370 | } |
39e2a438 CB |
1371 | |
1372 | /* | |
1373 | * We didn't add the state client to the list. Either because | |
1374 | * we failed to allocate memory (unlikely) or because the state | |
1375 | * was already reached by the time we were ready to add it. So | |
1376 | * fallthrough and clean it up. | |
1377 | */ | |
ea2a070b | 1378 | TRACE("Closing state client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
f6fc1565 | 1379 | } |
cd5369b0 | 1380 | |
ea2a070b | 1381 | TRACE("Closing client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
cd5369b0 | 1382 | close(fd); |
724e753c MN |
1383 | } |
1384 | ||
84c92abd DE |
1385 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1386 | struct lxc_epoll_descr *descr) | |
724e753c | 1387 | { |
5265a60c | 1388 | __do_free void *reqdata = NULL; |
724e753c | 1389 | int ret; |
ef6e34ee | 1390 | struct lxc_cmd_req req; |
724e753c MN |
1391 | struct lxc_handler *handler = data; |
1392 | ||
aae93dd3 | 1393 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
ded1d23f | 1394 | if (ret < 0) { |
ea2a070b | 1395 | SYSERROR("Failed to receive data on command socket for command \"%s\"", lxc_cmd_str(req.cmd)); |
9044b79e | 1396 | |
1397 | if (errno == EACCES) { | |
1398 | /* We don't care for the peer, just send and close. */ | |
ea2a070b CB |
1399 | struct lxc_cmd_rsp rsp = { |
1400 | .ret = ret, | |
1401 | }; | |
9044b79e | 1402 | |
1403 | lxc_cmd_rsp_send(fd, &rsp); | |
1404 | } | |
1405 | ||
724e753c MN |
1406 | goto out_close; |
1407 | } | |
1408 | ||
fe84a562 | 1409 | if (ret == 0) |
724e753c | 1410 | goto out_close; |
724e753c | 1411 | |
ef6e34ee | 1412 | if (ret != sizeof(req)) { |
ea2a070b | 1413 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1414 | ret = -1; |
1415 | goto out_close; | |
1416 | } | |
1417 | ||
ea2a070b CB |
1418 | if ((req.datalen > LXC_CMD_DATA_MAX) && (req.cmd != LXC_CMD_CONSOLE_LOG)) { |
1419 | ERROR("Received command data length %d is too large for command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); | |
fe84a562 CB |
1420 | errno = EFBIG; |
1421 | ret = -EFBIG; | |
724e753c MN |
1422 | goto out_close; |
1423 | } | |
1424 | ||
ef6e34ee | 1425 | if (req.datalen > 0) { |
5265a60c | 1426 | reqdata = must_realloc(NULL, req.datalen); |
e3233f26 | 1427 | ret = lxc_recv_nointr(fd, reqdata, req.datalen, 0); |
ef6e34ee | 1428 | if (ret != req.datalen) { |
ea2a070b | 1429 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
b2a48508 | 1430 | ret = LXC_MAINLOOP_ERROR; |
ef6e34ee DE |
1431 | goto out_close; |
1432 | } | |
fe84a562 | 1433 | |
ef6e34ee DE |
1434 | req.data = reqdata; |
1435 | } | |
1436 | ||
cdb2a47f | 1437 | ret = lxc_cmd_process(fd, &req, handler, descr); |
724e753c | 1438 | if (ret) { |
fe84a562 | 1439 | /* This is not an error, but only a request to close fd. */ |
b2a48508 | 1440 | ret = LXC_MAINLOOP_CONTINUE; |
724e753c MN |
1441 | goto out_close; |
1442 | } | |
1443 | ||
1444 | out: | |
1445 | return ret; | |
fe84a562 | 1446 | |
724e753c | 1447 | out_close: |
f6fc1565 | 1448 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
1449 | goto out; |
1450 | } | |
1451 | ||
84c92abd DE |
1452 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
1453 | struct lxc_epoll_descr *descr) | |
724e753c | 1454 | { |
4c2effce | 1455 | __do_close_prot_errno int connection = -EBADF; |
fe84a562 | 1456 | int opt = 1, ret = -1; |
724e753c MN |
1457 | |
1458 | connection = accept(fd, NULL, 0); | |
6c6497ea CB |
1459 | if (connection < 0) |
1460 | return log_error_errno(LXC_MAINLOOP_ERROR, errno, "Failed to accept connection to run command"); | |
724e753c | 1461 | |
fe84a562 | 1462 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1463 | if (ret < 0) |
1464 | return log_error_errno(ret, errno, "Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc | 1465 | |
fe84a562 | 1466 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
6c6497ea CB |
1467 | if (ret < 0) |
1468 | return log_error_errno(ret, errno, "Failed to enable necessary credentials on command socket"); | |
724e753c | 1469 | |
ef6e34ee | 1470 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
6c6497ea CB |
1471 | if (ret) |
1472 | return log_error(ret, "Failed to add command handler"); | |
724e753c | 1473 | |
ea2a070b | 1474 | TRACE("Accepted new client as fd %d on command server fd %d", connection, fd); |
240fecd0 | 1475 | move_fd(connection); |
724e753c | 1476 | return ret; |
724e753c MN |
1477 | } |
1478 | ||
9dfa4041 | 1479 | int lxc_cmd_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 1480 | { |
c13e7111 CB |
1481 | __do_close_prot_errno int fd = -EBADF; |
1482 | int ret; | |
b1234129 | 1483 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
724e753c | 1484 | |
5b46db1a | 1485 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, NULL, suffix); |
fe84a562 | 1486 | if (ret < 0) |
9ba8130c | 1487 | return -1; |
724e753c | 1488 | |
aae93dd3 | 1489 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 1490 | if (fd < 0) { |
08aa08fe | 1491 | if (errno == EADDRINUSE) |
fe84a562 | 1492 | ERROR("Container \"%s\" appears to be already running", name); |
6d1400b5 | 1493 | |
6c6497ea | 1494 | return log_error_errno(-1, errno, "Failed to create command socket %s", &path[1]); |
724e753c MN |
1495 | } |
1496 | ||
fe84a562 | 1497 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1498 | if (ret < 0) |
1499 | return log_error_errno(-1, errno, "Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f | 1500 | |
6c6497ea | 1501 | return log_trace(move_fd(fd), "Created abstract unix socket \"%s\"", &path[1]); |
d2e30e99 DE |
1502 | } |
1503 | ||
fe84a562 | 1504 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 1505 | struct lxc_handler *handler) |
d2e30e99 | 1506 | { |
fe84a562 | 1507 | int ret; |
d2e30e99 | 1508 | |
ea2a070b | 1509 | ret = lxc_mainloop_add_handler(descr, handler->conf->maincmd_fd, lxc_cmd_accept, handler); |
6c6497ea | 1510 | if (ret < 0) |
ea2a070b | 1511 | return log_error(ret, "Failed to add handler for command socket fd %d", handler->conf->maincmd_fd); |
724e753c MN |
1512 | |
1513 | return ret; | |
1514 | } |