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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", |
746aab51 | 86 | [LXC_CMD_GET_INIT_PIDFD] = "get_init_pidfd", |
a900cbaf WB |
87 | [LXC_CMD_GET_LIMITING_CGROUP] = "get_limiting_cgroup", |
88 | [LXC_CMD_GET_LIMITING_CGROUP2_FD] = "get_limiting_cgroup2_fd", | |
ef6e34ee | 89 | }; |
724e753c | 90 | |
f371aca9 | 91 | if (cmd >= LXC_CMD_MAX) |
a8007512 | 92 | return "Invalid request"; |
fe84a562 | 93 | |
ef6e34ee DE |
94 | return cmdname[cmd]; |
95 | } | |
96 | ||
97 | /* | |
98 | * lxc_cmd_rsp_recv: Receive a response to a command | |
99 | * | |
100 | * @sock : the socket connected to the container | |
101 | * @cmd : command to put response in | |
102 | * | |
103 | * Returns the size of the response message or < 0 on failure | |
104 | * | |
105 | * Note that if the command response datalen > 0, then data is | |
106 | * a malloc()ed buffer and should be free()ed by the caller. If | |
107 | * the response data is <= a void * worth of data, it will be | |
108 | * stored directly in data and datalen will be 0. | |
109 | * | |
110 | * As a special case, the response for LXC_CMD_CONSOLE is created | |
cecf3e83 | 111 | * here as it contains an fd for the ptmx pty passed through the |
0115f8fd | 112 | * unix socket. |
ef6e34ee DE |
113 | */ |
114 | static int lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) | |
115 | { | |
f62cf1d4 | 116 | __do_close int fd_rsp = -EBADF; |
23a917e5 | 117 | int ret; |
ef6e34ee DE |
118 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
119 | ||
23a917e5 CB |
120 | ret = lxc_abstract_unix_recv_fds(sock, &fd_rsp, 1, rsp, sizeof(*rsp)); |
121 | if (ret < 0) | |
122 | return log_warn_errno(-1, | |
123 | errno, "Failed to receive response for command \"%s\"", | |
124 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 125 | TRACE("Command \"%s\" received response", lxc_cmd_str(cmd->req.cmd)); |
ef6e34ee DE |
126 | |
127 | if (cmd->req.cmd == LXC_CMD_CONSOLE) { | |
128 | struct lxc_cmd_console_rsp_data *rspdata; | |
129 | ||
0115f8fd DE |
130 | /* recv() returns 0 bytes when a tty cannot be allocated, |
131 | * rsp->ret is < 0 when the peer permission check failed | |
132 | */ | |
133 | if (ret == 0 || rsp->ret < 0) | |
134 | return 0; | |
135 | ||
ef6e34ee | 136 | rspdata = malloc(sizeof(*rspdata)); |
23a917e5 CB |
137 | if (!rspdata) |
138 | return log_warn_errno(-1, | |
139 | ENOMEM, "Failed to receive response for command \"%s\"", | |
140 | lxc_cmd_str(cmd->req.cmd)); | |
2a850b2c | 141 | |
cecf3e83 | 142 | rspdata->ptmxfd = move_fd(fd_rsp); |
ef6e34ee DE |
143 | rspdata->ttynum = PTR_TO_INT(rsp->data); |
144 | rsp->data = rspdata; | |
145 | } | |
146 | ||
a900cbaf WB |
147 | if (cmd->req.cmd == LXC_CMD_GET_CGROUP2_FD || |
148 | cmd->req.cmd == LXC_CMD_GET_LIMITING_CGROUP2_FD) | |
149 | { | |
23a917e5 CB |
150 | int cgroup2_fd = move_fd(fd_rsp); |
151 | rsp->data = INT_TO_PTR(cgroup2_fd); | |
860e7c43 | 152 | } |
fe84a562 | 153 | |
746aab51 CB |
154 | if (cmd->req.cmd == LXC_CMD_GET_INIT_PIDFD) { |
155 | int init_pidfd = move_fd(fd_rsp); | |
156 | rsp->data = INT_TO_PTR(init_pidfd); | |
157 | } | |
158 | ||
23a917e5 CB |
159 | if (rsp->datalen == 0) |
160 | return log_debug(ret, | |
161 | "Response data length for command \"%s\" is 0", | |
162 | lxc_cmd_str(cmd->req.cmd)); | |
163 | ||
191d43cc | 164 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && |
23a917e5 CB |
165 | (cmd->req.cmd != LXC_CMD_CONSOLE_LOG)) |
166 | return log_error(-1, "Response data for command \"%s\" is too long: %d bytes > %d", | |
167 | lxc_cmd_str(cmd->req.cmd), rsp->datalen, | |
168 | LXC_CMD_DATA_MAX); | |
ef6e34ee | 169 | |
191d43cc CB |
170 | if (cmd->req.cmd == LXC_CMD_CONSOLE_LOG) { |
171 | rsp->data = malloc(rsp->datalen + 1); | |
172 | ((char *)rsp->data)[rsp->datalen] = '\0'; | |
173 | } else { | |
174 | rsp->data = malloc(rsp->datalen); | |
175 | } | |
23a917e5 CB |
176 | if (!rsp->data) |
177 | return log_error_errno(-1, | |
178 | ENOMEM, "Failed to allocate response buffer for command \"%s\"", | |
179 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 180 | |
2a850b2c | 181 | ret = lxc_recv_nointr(sock, rsp->data, rsp->datalen, 0); |
23a917e5 CB |
182 | if (ret != rsp->datalen) |
183 | return log_error_errno(-1, | |
184 | errno, "Failed to receive response data for command \"%s\"", | |
185 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
186 | |
187 | return ret; | |
188 | } | |
189 | ||
ef6e34ee DE |
190 | /* |
191 | * lxc_cmd_rsp_send: Send a command response | |
192 | * | |
193 | * @fd : file descriptor of socket to send response on | |
194 | * @rsp : response to send | |
195 | * | |
196 | * Returns 0 on success, < 0 on failure | |
197 | */ | |
198 | static int lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) | |
199 | { | |
fe84a562 | 200 | ssize_t ret; |
ef6e34ee | 201 | |
7fbb15ec CB |
202 | errno = EMSGSIZE; |
203 | ret = lxc_send_nointr(fd, rsp, sizeof(*rsp), MSG_NOSIGNAL); | |
6c6497ea CB |
204 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) |
205 | return log_error_errno(-1, errno, "Failed to send command response %zd", ret); | |
ef6e34ee | 206 | |
a674dfe1 | 207 | if (!rsp->data || rsp->datalen <= 0) |
fe84a562 CB |
208 | return 0; |
209 | ||
7fbb15ec CB |
210 | errno = EMSGSIZE; |
211 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
6c6497ea CB |
212 | if (ret < 0 || ret != (ssize_t)rsp->datalen) |
213 | return log_warn_errno(-1, errno, "Failed to send command response data %zd", ret); | |
fe84a562 | 214 | |
ef6e34ee DE |
215 | return 0; |
216 | } | |
217 | ||
c01c2be6 | 218 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 219 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 | 220 | { |
f62cf1d4 | 221 | __do_close int client_fd = -EBADF; |
fe84a562 | 222 | ssize_t ret = -1; |
c01c2be6 | 223 | |
9dfa4041 | 224 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
2a850b2c | 225 | if (client_fd < 0) |
fe84a562 | 226 | return -1; |
c01c2be6 | 227 | |
fe84a562 CB |
228 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
229 | sizeof(cmd->req)); | |
2a850b2c | 230 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) |
e96f9291 | 231 | return -1; |
9044b79e | 232 | |
cdb2a47f CB |
233 | if (cmd->req.cmd == LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER) { |
234 | int notify_fd = PTR_TO_INT(cmd->req.data); | |
235 | ret = lxc_abstract_unix_send_fds(client_fd, ¬ify_fd, 1, NULL, 0); | |
236 | if (ret <= 0) | |
237 | return -1; | |
238 | } else { | |
239 | if (cmd->req.datalen <= 0) | |
240 | return move_fd(client_fd); | |
c01c2be6 | 241 | |
cdb2a47f CB |
242 | errno = EMSGSIZE; |
243 | ret = lxc_send_nointr(client_fd, (void *)cmd->req.data, | |
244 | cmd->req.datalen, MSG_NOSIGNAL); | |
245 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) | |
246 | return -1; | |
247 | } | |
c01c2be6 | 248 | |
240fecd0 | 249 | return move_fd(client_fd); |
c01c2be6 CB |
250 | } |
251 | ||
ef6e34ee DE |
252 | /* |
253 | * lxc_cmd: Connect to the specified running container, send it a command | |
254 | * request and collect the response | |
255 | * | |
256 | * @name : name of container to connect to | |
1e8cfdf6 | 257 | * @cmd : command with initialized request to send |
ef6e34ee DE |
258 | * @stopped : output indicator if the container was not running |
259 | * @lxcpath : the lxcpath in which the container is running | |
260 | * | |
261 | * Returns the size of the response message on success, < 0 on failure | |
262 | * | |
263 | * Note that there is a special case for LXC_CMD_CONSOLE. For this command | |
264 | * the fd cannot be closed because it is used as a placeholder to indicate | |
265 | * that a particular tty slot is in use. The fd is also used as a signal to | |
266 | * the container that when the caller dies or closes the fd, the container | |
0115f8fd DE |
267 | * will notice the fd on its side of the socket in its mainloop select and |
268 | * then free the slot with lxc_cmd_fd_cleanup(). The socket fd will be | |
269 | * returned in the cmd response structure. | |
ef6e34ee DE |
270 | */ |
271 | static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped, | |
88556fd7 | 272 | const char *lxcpath, const char *hashed_sock_name) |
724e753c | 273 | { |
f62cf1d4 | 274 | __do_close int client_fd = -EBADF; |
fe84a562 | 275 | int ret = -1; |
dbc9832d CB |
276 | bool stay_connected = false; |
277 | ||
278 | if (cmd->req.cmd == LXC_CMD_CONSOLE || | |
54446942 | 279 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 280 | stay_connected = true; |
724e753c | 281 | |
0ecf64b5 SH |
282 | *stopped = 0; |
283 | ||
c01c2be6 CB |
284 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
285 | if (client_fd < 0) { | |
00e5ca13 | 286 | if (errno == ECONNREFUSED || errno == EPIPE) |
ef6e34ee | 287 | *stopped = 1; |
3f903c04 | 288 | |
6c6497ea CB |
289 | return log_trace_errno(-1, errno, "Command \"%s\" failed to connect command socket", |
290 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
291 | } |
292 | ||
c01c2be6 | 293 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
2a850b2c | 294 | if (ret < 0 && errno == ECONNRESET) |
6b7f85cb | 295 | *stopped = 1; |
6a93ae77 | 296 | |
ea2a070b CB |
297 | TRACE("Opened new command socket connection fd %d for command \"%s\"", |
298 | client_fd, lxc_cmd_str(cmd->req.cmd)); | |
299 | ||
c34ff119 | 300 | if (stay_connected && ret > 0) |
240fecd0 | 301 | cmd->rsp.ret = move_fd(client_fd); |
43eb6f29 | 302 | |
1362f2eb | 303 | return ret; |
724e753c MN |
304 | } |
305 | ||
b494d2dd SH |
306 | int lxc_try_cmd(const char *name, const char *lxcpath) |
307 | { | |
0ecf64b5 | 308 | int stopped, ret; |
b494d2dd SH |
309 | struct lxc_cmd_rr cmd = { |
310 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
311 | }; | |
312 | ||
88556fd7 | 313 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
314 | if (stopped) |
315 | return 0; | |
316 | if (ret > 0 && cmd.rsp.ret < 0) { | |
317 | errno = cmd.rsp.ret; | |
318 | return -1; | |
319 | } | |
320 | if (ret > 0) | |
321 | return 0; | |
322 | ||
fe84a562 CB |
323 | /* At this point we weren't denied access, and the container *was* |
324 | * started. There was some inexplicable error in the protocol. I'm not | |
325 | * clear on whether we should return -1 here, but we didn't receive a | |
326 | * -EACCES, so technically it's not that we're not allowed to control | |
327 | * the container - it's just not behaving. | |
b494d2dd SH |
328 | */ |
329 | return 0; | |
330 | } | |
331 | ||
e6bc68d6 WB |
332 | /* |
333 | * Validate that the input is a proper string parameter. If not, | |
334 | * send an EINVAL response and return -1. | |
335 | * | |
336 | * Precondition: there is non-zero-length data available. | |
337 | */ | |
338 | static int validate_string_request(int fd, const struct lxc_cmd_req *req) | |
339 | { | |
340 | int ret; | |
341 | size_t maxlen = req->datalen - 1; | |
342 | const char *data = req->data; | |
343 | ||
344 | if (data[maxlen] == 0 && strnlen(data, maxlen) == maxlen) | |
345 | return 0; | |
346 | ||
347 | struct lxc_cmd_rsp rsp = { | |
348 | .ret = -EINVAL, | |
349 | .datalen = 0, | |
350 | .data = NULL, | |
351 | }; | |
352 | ||
353 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
354 | if (ret < 0) | |
355 | return LXC_CMD_REAP_CLIENT_FD; | |
356 | ||
357 | return -1; | |
358 | } | |
359 | ||
cc4c0832 | 360 | /* Implementations of the commands and their callbacks */ |
ef6e34ee DE |
361 | |
362 | /* | |
363 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
364 | * | |
365 | * @name : name of container to connect to | |
366 | * @lxcpath : the lxcpath in which the container is running | |
367 | * | |
368 | * Returns the pid on success, < 0 on failure | |
369 | */ | |
370 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 371 | { |
0ecf64b5 | 372 | int ret, stopped; |
565eb353 | 373 | pid_t pid = -1; |
ef6e34ee | 374 | struct lxc_cmd_rr cmd = { |
e8cd1208 CB |
375 | .req = { |
376 | .cmd = LXC_CMD_GET_INIT_PID | |
377 | }, | |
378 | .rsp = { | |
565eb353 | 379 | .data = PID_TO_PTR(pid) |
e8cd1208 | 380 | } |
ef6e34ee DE |
381 | }; |
382 | ||
88556fd7 | 383 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 384 | if (ret < 0) |
8ed8a626 | 385 | return -1; |
ef6e34ee | 386 | |
565eb353 | 387 | pid = PTR_TO_PID(cmd.rsp.data); |
9234406b CB |
388 | if (pid < 0) |
389 | return -1; | |
390 | ||
391 | /* We need to assume that pid_t can actually hold any pid given to us | |
392 | * by the kernel. If it can't it's a libc bug. | |
393 | */ | |
394 | return (pid_t)pid; | |
43eb6f29 DL |
395 | } |
396 | ||
ef6e34ee | 397 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
398 | struct lxc_handler *handler, |
399 | struct lxc_epoll_descr *descr) | |
43eb6f29 | 400 | { |
ea2a070b | 401 | int ret; |
9234406b | 402 | struct lxc_cmd_rsp rsp = { |
565eb353 | 403 | .data = PID_TO_PTR(handler->pid) |
9234406b | 404 | }; |
ef6e34ee | 405 | |
ea2a070b CB |
406 | ret = lxc_cmd_rsp_send(fd, &rsp); |
407 | if (ret < 0) | |
408 | return LXC_CMD_REAP_CLIENT_FD; | |
409 | ||
410 | return 0; | |
43eb6f29 DL |
411 | } |
412 | ||
746aab51 CB |
413 | int lxc_cmd_get_init_pidfd(const char *name, const char *lxcpath) |
414 | { | |
415 | int ret, stopped; | |
416 | struct lxc_cmd_rr cmd = { | |
417 | .req = { | |
418 | .cmd = LXC_CMD_GET_INIT_PIDFD, | |
419 | }, | |
420 | }; | |
421 | ||
422 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
423 | if (ret < 0) | |
424 | return log_debug_errno(-1, errno, "Failed to process init pidfd command"); | |
425 | ||
426 | if (cmd.rsp.ret < 0) | |
427 | return log_debug_errno(-EBADF, errno, "Failed to receive init pidfd"); | |
428 | ||
429 | return PTR_TO_INT(cmd.rsp.data); | |
430 | } | |
431 | ||
432 | static int lxc_cmd_get_init_pidfd_callback(int fd, struct lxc_cmd_req *req, | |
433 | struct lxc_handler *handler, | |
434 | struct lxc_epoll_descr *descr) | |
435 | { | |
436 | struct lxc_cmd_rsp rsp = { | |
437 | .ret = 0, | |
438 | }; | |
439 | int ret; | |
440 | ||
441 | if (handler->pidfd < 0) | |
442 | rsp.ret = -EBADF; | |
443 | ret = lxc_abstract_unix_send_fds(fd, &handler->pidfd, 1, &rsp, sizeof(rsp)); | |
444 | if (ret < 0) | |
445 | return log_error(LXC_CMD_REAP_CLIENT_FD, "Failed to send init pidfd"); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
ef6e34ee DE |
450 | /* |
451 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
452 | * | |
453 | * @name : name of container to connect to | |
454 | * @lxcpath : the lxcpath in which the container is running | |
455 | * | |
456 | * Returns the clone flags on success, < 0 on failure | |
457 | */ | |
458 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
459 | { | |
0ecf64b5 | 460 | int ret, stopped; |
ef6e34ee | 461 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
462 | .req = { |
463 | .cmd = LXC_CMD_GET_CLONE_FLAGS, | |
464 | }, | |
ef6e34ee DE |
465 | }; |
466 | ||
88556fd7 | 467 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
468 | if (ret < 0) |
469 | return ret; | |
43eb6f29 | 470 | |
ef6e34ee DE |
471 | return PTR_TO_INT(cmd.rsp.data); |
472 | } | |
473 | ||
474 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
475 | struct lxc_handler *handler, |
476 | struct lxc_epoll_descr *descr) | |
26b2d152 | 477 | { |
ea2a070b | 478 | int ret; |
6c6497ea CB |
479 | struct lxc_cmd_rsp rsp = { |
480 | .data = INT_TO_PTR(handler->ns_clone_flags), | |
481 | }; | |
ef6e34ee | 482 | |
ea2a070b CB |
483 | ret = lxc_cmd_rsp_send(fd, &rsp); |
484 | if (ret < 0) | |
485 | return LXC_CMD_REAP_CLIENT_FD; | |
486 | ||
487 | return 0; | |
ef6e34ee DE |
488 | } |
489 | ||
a900cbaf WB |
490 | static char *lxc_cmd_get_cgroup_path_do(const char *name, const char *lxcpath, |
491 | const char *subsystem, | |
492 | lxc_cmd_t command) | |
ef6e34ee | 493 | { |
0ecf64b5 | 494 | int ret, stopped; |
ef6e34ee | 495 | struct lxc_cmd_rr cmd = { |
b98f7d6e | 496 | .req = { |
a900cbaf | 497 | .cmd = command, |
b98f7d6e | 498 | .data = subsystem, |
c2aed66d | 499 | .datalen = 0, |
b98f7d6e | 500 | }, |
26b2d152 MN |
501 | }; |
502 | ||
c2aed66d CB |
503 | cmd.req.data = subsystem; |
504 | cmd.req.datalen = 0; | |
505 | if (subsystem) | |
506 | cmd.req.datalen = strlen(subsystem) + 1; | |
507 | ||
88556fd7 | 508 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 509 | if (ret < 0) |
ef6e34ee DE |
510 | return NULL; |
511 | ||
400d579e WB |
512 | if (ret == 0) { |
513 | if (command == LXC_CMD_GET_LIMITING_CGROUP) { | |
514 | /* | |
515 | * This may indicate that the container was started | |
516 | * under an ealier version before | |
517 | * `cgroup_advanced_isolation` as implemented, there | |
518 | * it sees an unknown command and just closes the | |
519 | * socket, sending us an EOF. | |
520 | */ | |
521 | return lxc_cmd_get_cgroup_path_do(name, lxcpath, | |
522 | subsystem, | |
523 | LXC_CMD_GET_CGROUP); | |
524 | } | |
ef6e34ee | 525 | return NULL; |
400d579e | 526 | } |
ef6e34ee | 527 | |
fe84a562 | 528 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 529 | return NULL; |
3f903c04 | 530 | |
ef6e34ee DE |
531 | return cmd.rsp.data; |
532 | } | |
533 | ||
a900cbaf WB |
534 | /* |
535 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
536 | * particular subsystem. This is the cgroup path relative to the root | |
537 | * of the cgroup filesystem. | |
538 | * | |
539 | * @name : name of container to connect to | |
540 | * @lxcpath : the lxcpath in which the container is running | |
541 | * @subsystem : the subsystem being asked about | |
542 | * | |
543 | * Returns the path on success, NULL on failure. The caller must free() the | |
544 | * returned path. | |
545 | */ | |
546 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, | |
547 | const char *subsystem) | |
548 | { | |
549 | return lxc_cmd_get_cgroup_path_do(name, lxcpath, subsystem, | |
550 | LXC_CMD_GET_CGROUP); | |
551 | } | |
552 | ||
553 | /* | |
554 | * lxc_cmd_get_limiting_cgroup_path: Calculate a container's limiting cgroup | |
555 | * path for a particular subsystem. This is the cgroup path relative to the | |
556 | * root of the cgroup filesystem. This may be the same as the path returned by | |
557 | * lxc_cmd_get_cgroup_path if the container doesn't have a limiting path prefix | |
558 | * set. | |
559 | * | |
560 | * @name : name of container to connect to | |
561 | * @lxcpath : the lxcpath in which the container is running | |
562 | * @subsystem : the subsystem being asked about | |
563 | * | |
564 | * Returns the path on success, NULL on failure. The caller must free() the | |
565 | * returned path. | |
566 | */ | |
567 | char *lxc_cmd_get_limiting_cgroup_path(const char *name, const char *lxcpath, | |
568 | const char *subsystem) | |
569 | { | |
570 | return lxc_cmd_get_cgroup_path_do(name, lxcpath, subsystem, | |
571 | LXC_CMD_GET_LIMITING_CGROUP); | |
572 | } | |
573 | ||
574 | static int lxc_cmd_get_cgroup_callback_do(int fd, struct lxc_cmd_req *req, | |
575 | struct lxc_handler *handler, | |
576 | struct lxc_epoll_descr *descr, | |
577 | bool limiting_cgroup) | |
ef6e34ee | 578 | { |
ea2a070b | 579 | int ret; |
4fb3cba5 | 580 | const char *path; |
a900cbaf | 581 | const void *reqdata; |
fe84a562 | 582 | struct lxc_cmd_rsp rsp; |
2202afc9 | 583 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
a900cbaf | 584 | const char *(*get_fn)(struct cgroup_ops *ops, const char *controller); |
b98f7d6e | 585 | |
e6bc68d6 WB |
586 | if (req->datalen > 0) { |
587 | ret = validate_string_request(fd, req); | |
588 | if (ret != 0) | |
589 | return ret; | |
a900cbaf | 590 | reqdata = req->data; |
e6bc68d6 | 591 | } else { |
a900cbaf | 592 | reqdata = NULL; |
e6bc68d6 | 593 | } |
a900cbaf | 594 | |
29d652a9 WB |
595 | get_fn = (limiting_cgroup ? cgroup_ops->get_limiting_cgroup |
596 | : cgroup_ops->get_cgroup); | |
a900cbaf WB |
597 | |
598 | path = get_fn(cgroup_ops, reqdata); | |
599 | ||
b98f7d6e SH |
600 | if (!path) |
601 | return -1; | |
fe84a562 | 602 | |
4f17323e | 603 | rsp.ret = 0; |
fe84a562 CB |
604 | rsp.datalen = strlen(path) + 1; |
605 | rsp.data = (char *)path; | |
ef6e34ee | 606 | |
ea2a070b CB |
607 | ret = lxc_cmd_rsp_send(fd, &rsp); |
608 | if (ret < 0) | |
609 | return LXC_CMD_REAP_CLIENT_FD; | |
610 | ||
611 | return 0; | |
ef6e34ee DE |
612 | } |
613 | ||
a900cbaf WB |
614 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, |
615 | struct lxc_handler *handler, | |
616 | struct lxc_epoll_descr *descr) | |
617 | { | |
618 | return lxc_cmd_get_cgroup_callback_do(fd, req, handler, descr, false); | |
619 | } | |
620 | ||
621 | static int lxc_cmd_get_limiting_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
622 | struct lxc_handler *handler, | |
623 | struct lxc_epoll_descr *descr) | |
624 | { | |
625 | return lxc_cmd_get_cgroup_callback_do(fd, req, handler, descr, true); | |
626 | } | |
627 | ||
ef6e34ee DE |
628 | /* |
629 | * lxc_cmd_get_config_item: Get config item the running container | |
630 | * | |
631 | * @name : name of container to connect to | |
7fa3f2e9 | 632 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
633 | * @lxcpath : the lxcpath in which the container is running |
634 | * | |
635 | * Returns the item on success, NULL on failure. The caller must free() the | |
636 | * returned item. | |
637 | */ | |
638 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
639 | const char *lxcpath) | |
640 | { | |
0ecf64b5 | 641 | int ret, stopped; |
ef6e34ee DE |
642 | struct lxc_cmd_rr cmd = { |
643 | .req = { .cmd = LXC_CMD_GET_CONFIG_ITEM, | |
644 | .data = item, | |
fe84a562 | 645 | .datalen = strlen(item) + 1, |
ef6e34ee DE |
646 | }, |
647 | }; | |
648 | ||
88556fd7 | 649 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
650 | if (ret < 0) |
651 | return NULL; | |
652 | ||
653 | if (cmd.rsp.ret == 0) | |
654 | return cmd.rsp.data; | |
fe84a562 | 655 | |
ef6e34ee DE |
656 | return NULL; |
657 | } | |
658 | ||
659 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
660 | struct lxc_handler *handler, |
661 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 662 | { |
5265a60c | 663 | __do_free char *cidata = NULL; |
ef6e34ee | 664 | int cilen; |
30aec088 | 665 | struct lxc_config_t *item; |
fe84a562 | 666 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
667 | |
668 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 669 | item = lxc_get_config(req->data); |
30aec088 CB |
670 | if (!item) |
671 | goto err1; | |
fe84a562 | 672 | |
cccd2219 | 673 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
674 | if (cilen <= 0) |
675 | goto err1; | |
676 | ||
5265a60c | 677 | cidata = must_realloc(NULL, cilen + 1); |
cccd2219 | 678 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 679 | goto err1; |
fe84a562 | 680 | |
ef6e34ee DE |
681 | cidata[cilen] = '\0'; |
682 | rsp.data = cidata; | |
683 | rsp.datalen = cilen + 1; | |
684 | rsp.ret = 0; | |
685 | goto out; | |
686 | ||
687 | err1: | |
688 | rsp.ret = -1; | |
689 | out: | |
ea2a070b CB |
690 | cilen = lxc_cmd_rsp_send(fd, &rsp); |
691 | if (cilen < 0) | |
692 | return LXC_CMD_REAP_CLIENT_FD; | |
693 | ||
694 | return 0; | |
ef6e34ee DE |
695 | } |
696 | ||
697 | /* | |
698 | * lxc_cmd_get_state: Get current state of the container | |
699 | * | |
700 | * @name : name of container to connect to | |
701 | * @lxcpath : the lxcpath in which the container is running | |
702 | * | |
703 | * Returns the state on success, < 0 on failure | |
704 | */ | |
dbc9832d | 705 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 706 | { |
0ecf64b5 | 707 | int ret, stopped; |
ef6e34ee | 708 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
709 | .req = { |
710 | .cmd = LXC_CMD_GET_STATE, | |
711 | }, | |
ef6e34ee | 712 | }; |
26b2d152 | 713 | |
88556fd7 | 714 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 715 | if (ret < 0 && stopped) |
ef6e34ee DE |
716 | return STOPPED; |
717 | ||
718 | if (ret < 0) | |
26b2d152 | 719 | return -1; |
26b2d152 | 720 | |
6c6497ea CB |
721 | if (!ret) |
722 | return log_warn(-1, "Container \"%s\" has stopped before sending its state", name); | |
fe84a562 | 723 | |
6c6497ea CB |
724 | return log_debug(PTR_TO_INT(cmd.rsp.data), |
725 | "Container \"%s\" is in \"%s\" state", name, | |
726 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); | |
ef6e34ee DE |
727 | } |
728 | ||
729 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
730 | struct lxc_handler *handler, |
731 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 732 | { |
ea2a070b | 733 | int ret; |
6c6497ea CB |
734 | struct lxc_cmd_rsp rsp = { |
735 | .data = INT_TO_PTR(handler->state), | |
736 | }; | |
ef6e34ee | 737 | |
ea2a070b CB |
738 | ret = lxc_cmd_rsp_send(fd, &rsp); |
739 | if (ret < 0) | |
740 | return LXC_CMD_REAP_CLIENT_FD; | |
741 | ||
742 | return 0; | |
ef6e34ee DE |
743 | } |
744 | ||
745 | /* | |
746 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
747 | * the processes running inside this container will be killed. | |
748 | * | |
749 | * @name : name of container to connect to | |
750 | * @lxcpath : the lxcpath in which the container is running | |
751 | * | |
752 | * Returns 0 on success, < 0 on failure | |
753 | */ | |
754 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
755 | { | |
0ecf64b5 | 756 | int ret, stopped; |
ef6e34ee | 757 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
758 | .req = { |
759 | .cmd = LXC_CMD_STOP, | |
760 | }, | |
ef6e34ee DE |
761 | }; |
762 | ||
88556fd7 | 763 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 764 | if (ret < 0) { |
6c6497ea CB |
765 | if (stopped) |
766 | return log_info(0, "Container \"%s\" is already stopped", name); | |
fe84a562 | 767 | |
26b2d152 MN |
768 | return -1; |
769 | } | |
770 | ||
fe84a562 CB |
771 | /* We do not expect any answer, because we wait for the connection to be |
772 | * closed. | |
95d5b147 | 773 | */ |
6c6497ea CB |
774 | if (ret > 0) |
775 | return log_error_errno(-1, -cmd.rsp.ret, "Failed to stop container \"%s\"", name); | |
26b2d152 | 776 | |
6c6497ea | 777 | return log_info(0, "Container \"%s\" has stopped", name); |
26b2d152 MN |
778 | } |
779 | ||
ef6e34ee | 780 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
781 | struct lxc_handler *handler, |
782 | struct lxc_epoll_descr *descr) | |
d5088cf2 | 783 | { |
ef6e34ee | 784 | struct lxc_cmd_rsp rsp; |
ef6e34ee | 785 | int stopsignal = SIGKILL; |
2202afc9 | 786 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ea2a070b | 787 | int ret; |
ef6e34ee DE |
788 | |
789 | if (handler->conf->stopsignal) | |
790 | stopsignal = handler->conf->stopsignal; | |
791 | memset(&rsp, 0, sizeof(rsp)); | |
9837ee46 | 792 | |
8ad4fa68 | 793 | if (handler->pidfd >= 0) |
9837ee46 CB |
794 | rsp.ret = lxc_raw_pidfd_send_signal(handler->pidfd, stopsignal, NULL, 0); |
795 | else | |
796 | rsp.ret = kill(handler->pid, stopsignal); | |
ef6e34ee | 797 | if (!rsp.ret) { |
9837ee46 CB |
798 | if (handler->pidfd >= 0) |
799 | TRACE("Sent signal %d to pidfd %d", stopsignal, handler->pidfd); | |
800 | else | |
801 | TRACE("Sent signal %d to pidfd %d", stopsignal, handler->pid); | |
802 | ||
018051e3 CB |
803 | rsp.ret = cgroup_ops->unfreeze(cgroup_ops, -1); |
804 | if (!rsp.ret) | |
95d5b147 | 805 | return 0; |
fe84a562 CB |
806 | |
807 | ERROR("Failed to unfreeze container \"%s\"", handler->name); | |
018051e3 CB |
808 | rsp.ret = -errno; |
809 | } else { | |
810 | rsp.ret = -errno; | |
ef6e34ee DE |
811 | } |
812 | ||
ea2a070b CB |
813 | ret = lxc_cmd_rsp_send(fd, &rsp); |
814 | if (ret < 0) | |
815 | return LXC_CMD_REAP_CLIENT_FD; | |
816 | ||
817 | return 0; | |
ef6e34ee | 818 | } |
d5088cf2 | 819 | |
b5159817 | 820 | /* |
2bd158cc | 821 | * lxc_cmd_terminal_winch: noop |
b5159817 DE |
822 | * |
823 | * @name : name of container to connect to | |
824 | * @lxcpath : the lxcpath in which the container is running | |
825 | * | |
826 | * Returns 0 on success, < 0 on failure | |
827 | */ | |
8ccbbf94 | 828 | int lxc_cmd_terminal_winch(const char *name, const char *lxcpath) |
b5159817 | 829 | { |
b5159817 DE |
830 | return 0; |
831 | } | |
832 | ||
8ccbbf94 | 833 | static int lxc_cmd_terminal_winch_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
834 | struct lxc_handler *handler, |
835 | struct lxc_epoll_descr *descr) | |
b5159817 | 836 | { |
2bd158cc | 837 | /* should never be called */ |
6c6497ea | 838 | return log_error_errno(-1, ENOSYS, "Called lxc_cmd_terminal_winch_callback()"); |
b5159817 DE |
839 | } |
840 | ||
ef6e34ee DE |
841 | /* |
842 | * lxc_cmd_console: Open an fd to a tty in the container | |
843 | * | |
844 | * @name : name of container to connect to | |
845 | * @ttynum : in: the tty to open or -1 for next available | |
846 | * : out: the tty allocated | |
cecf3e83 | 847 | * @fd : out: file descriptor for ptmx side of pty |
ef6e34ee DE |
848 | * @lxcpath : the lxcpath in which the container is running |
849 | * | |
0115f8fd | 850 | * Returns fd holding tty allocated on success, < 0 on failure |
ef6e34ee DE |
851 | */ |
852 | int lxc_cmd_console(const char *name, int *ttynum, int *fd, const char *lxcpath) | |
853 | { | |
8259d86d | 854 | __do_free struct lxc_cmd_console_rsp_data *rspdata = NULL; |
0ecf64b5 | 855 | int ret, stopped; |
ef6e34ee | 856 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
857 | .req = { |
858 | .cmd = LXC_CMD_CONSOLE, | |
859 | .data = INT_TO_PTR(*ttynum), | |
860 | }, | |
ef6e34ee | 861 | }; |
d5088cf2 | 862 | |
88556fd7 | 863 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
864 | if (ret < 0) |
865 | return ret; | |
0115f8fd | 866 | |
8259d86d | 867 | rspdata = cmd.rsp.data; |
6c6497ea CB |
868 | if (cmd.rsp.ret < 0) |
869 | return log_error_errno(-1, -cmd.rsp.ret, "Denied access to tty"); | |
d5088cf2 | 870 | |
6c6497ea CB |
871 | if (ret == 0) |
872 | return log_error(-1, "tty number %d invalid, busy or all ttys busy", *ttynum); | |
ef6e34ee | 873 | |
cecf3e83 | 874 | if (rspdata->ptmxfd < 0) |
6c6497ea | 875 | return log_error(-1, "Unable to allocate fd for tty %d", rspdata->ttynum); |
ef6e34ee | 876 | |
fe84a562 | 877 | ret = cmd.rsp.ret; /* socket fd */ |
cecf3e83 | 878 | *fd = rspdata->ptmxfd; |
ef6e34ee | 879 | *ttynum = rspdata->ttynum; |
fe84a562 | 880 | |
6c6497ea | 881 | return log_info(ret, "Alloced fd %d for tty %d via socket %d", *fd, rspdata->ttynum, ret); |
ef6e34ee DE |
882 | } |
883 | ||
884 | static int lxc_cmd_console_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
885 | struct lxc_handler *handler, |
886 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 887 | { |
cecf3e83 | 888 | int ptmxfd, ret; |
ef6e34ee | 889 | struct lxc_cmd_rsp rsp; |
fe84a562 | 890 | int ttynum = PTR_TO_INT(req->data); |
ef6e34ee | 891 | |
cecf3e83 CB |
892 | ptmxfd = lxc_terminal_allocate(handler->conf, fd, &ttynum); |
893 | if (ptmxfd < 0) | |
ea2a070b | 894 | return LXC_CMD_REAP_CLIENT_FD; |
ef6e34ee | 895 | |
ef6e34ee DE |
896 | memset(&rsp, 0, sizeof(rsp)); |
897 | rsp.data = INT_TO_PTR(ttynum); | |
cecf3e83 | 898 | ret = lxc_abstract_unix_send_fds(fd, &ptmxfd, 1, &rsp, sizeof(rsp)); |
fe84a562 | 899 | if (ret < 0) { |
3dfe6f8d | 900 | lxc_terminal_free(handler->conf, fd); |
ea2a070b CB |
901 | return log_error_errno(LXC_CMD_REAP_CLIENT_FD, errno, |
902 | "Failed to send tty to client"); | |
ef6e34ee DE |
903 | } |
904 | ||
ef6e34ee | 905 | return 0; |
d5088cf2 CS |
906 | } |
907 | ||
88556fd7 ÇO |
908 | /* |
909 | * lxc_cmd_get_name: Returns the name of the container | |
910 | * | |
911 | * @hashed_sock_name: hashed socket name | |
912 | * | |
913 | * Returns the name on success, NULL on failure. | |
914 | */ | |
915 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
916 | { | |
917 | int ret, stopped; | |
918 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
919 | .req = { |
920 | .cmd = LXC_CMD_GET_NAME, | |
921 | }, | |
88556fd7 ÇO |
922 | }; |
923 | ||
924 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 925 | if (ret < 0) |
88556fd7 | 926 | return NULL; |
88556fd7 ÇO |
927 | |
928 | if (cmd.rsp.ret == 0) | |
929 | return cmd.rsp.data; | |
fe84a562 | 930 | |
88556fd7 ÇO |
931 | return NULL; |
932 | } | |
933 | ||
934 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
935 | struct lxc_handler *handler, |
936 | struct lxc_epoll_descr *descr) | |
88556fd7 | 937 | { |
ea2a070b | 938 | int ret; |
88556fd7 ÇO |
939 | struct lxc_cmd_rsp rsp; |
940 | ||
941 | memset(&rsp, 0, sizeof(rsp)); | |
942 | ||
f0ecc19d | 943 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
944 | rsp.datalen = strlen(handler->name) + 1; |
945 | rsp.ret = 0; | |
946 | ||
ea2a070b CB |
947 | ret = lxc_cmd_rsp_send(fd, &rsp); |
948 | if (ret < 0) | |
949 | return LXC_CMD_REAP_CLIENT_FD; | |
950 | ||
951 | return 0; | |
88556fd7 ÇO |
952 | } |
953 | ||
954 | /* | |
955 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
956 | * | |
957 | * @hashed_sock_name: hashed socket name | |
958 | * | |
959 | * Returns the lxcpath on success, NULL on failure. | |
960 | */ | |
961 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
962 | { | |
963 | int ret, stopped; | |
964 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
965 | .req = { |
966 | .cmd = LXC_CMD_GET_LXCPATH, | |
967 | }, | |
88556fd7 | 968 | }; |
724e753c | 969 | |
88556fd7 | 970 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 971 | if (ret < 0) |
88556fd7 | 972 | return NULL; |
88556fd7 ÇO |
973 | |
974 | if (cmd.rsp.ret == 0) | |
975 | return cmd.rsp.data; | |
fe84a562 | 976 | |
88556fd7 ÇO |
977 | return NULL; |
978 | } | |
979 | ||
980 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
981 | struct lxc_handler *handler, |
982 | struct lxc_epoll_descr *descr) | |
88556fd7 | 983 | { |
ea2a070b | 984 | int ret; |
6c6497ea CB |
985 | struct lxc_cmd_rsp rsp = { |
986 | .ret = 0, | |
987 | .data = (char *)handler->lxcpath, | |
988 | .datalen = strlen(handler->lxcpath) + 1, | |
989 | }; | |
88556fd7 | 990 | |
ea2a070b CB |
991 | ret = lxc_cmd_rsp_send(fd, &rsp); |
992 | if (ret < 0) | |
993 | return LXC_CMD_REAP_CLIENT_FD; | |
994 | ||
995 | return 0; | |
88556fd7 | 996 | } |
ef6e34ee | 997 | |
54446942 | 998 | int lxc_cmd_add_state_client(const char *name, const char *lxcpath, |
92e35018 CB |
999 | lxc_state_t states[MAX_STATE], |
1000 | int *state_client_fd) | |
dbc9832d | 1001 | { |
f62cf1d4 | 1002 | __do_close int clientfd = -EBADF; |
bc631984 | 1003 | int state, stopped; |
dbc9832d | 1004 | ssize_t ret; |
dbc9832d | 1005 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
1006 | .req = { |
1007 | .cmd = LXC_CMD_ADD_STATE_CLIENT, | |
1008 | .data = states, | |
1009 | .datalen = (sizeof(lxc_state_t) * MAX_STATE) | |
1010 | }, | |
dbc9832d CB |
1011 | }; |
1012 | ||
dbc9832d | 1013 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
1014 | if (states[STOPPED] != 0 && stopped != 0) |
1015 | return STOPPED; | |
1016 | ||
dbc9832d | 1017 | if (ret < 0) { |
f577e061 | 1018 | if (errno != ECONNREFUSED) |
6d1400b5 | 1019 | SYSERROR("Failed to execute command"); |
1020 | ||
dbc9832d CB |
1021 | return -1; |
1022 | } | |
fe84a562 | 1023 | |
dbc9832d CB |
1024 | /* We should now be guaranteed to get an answer from the state sending |
1025 | * function. | |
1026 | */ | |
cd889e57 | 1027 | clientfd = cmd.rsp.ret; |
6c6497ea CB |
1028 | if (clientfd < 0) |
1029 | return log_error_errno(-1, -clientfd, "Failed to receive socket fd"); | |
dbc9832d | 1030 | |
bc631984 | 1031 | state = PTR_TO_INT(cmd.rsp.data); |
6c6497ea CB |
1032 | if (state < MAX_STATE) |
1033 | return log_trace(state, "Container is already in requested state %s", lxc_state2str(state)); | |
bc631984 | 1034 | |
240fecd0 | 1035 | *state_client_fd = move_fd(clientfd); |
ea2a070b CB |
1036 | TRACE("State connection fd %d ready to listen for container state changes", *state_client_fd); |
1037 | return MAX_STATE; | |
dbc9832d CB |
1038 | } |
1039 | ||
ebbca852 | 1040 | static int lxc_cmd_add_state_client_callback(__owns int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1041 | struct lxc_handler *handler, |
1042 | struct lxc_epoll_descr *descr) | |
dbc9832d | 1043 | { |
44552fb2 | 1044 | int ret; |
dbc9832d | 1045 | struct lxc_cmd_rsp rsp = {0}; |
dbc9832d | 1046 | |
fe84a562 | 1047 | if (req->datalen < 0) |
ea2a070b | 1048 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 1049 | |
71fc9c04 | 1050 | if (req->datalen != (sizeof(lxc_state_t) * MAX_STATE)) |
ea2a070b | 1051 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 1052 | |
fe84a562 | 1053 | if (!req->data) |
ea2a070b | 1054 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 1055 | |
c01c2be6 | 1056 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 | 1057 | if (rsp.ret < 0) |
ea2a070b | 1058 | return LXC_CMD_REAP_CLIENT_FD; |
44552fb2 | 1059 | |
bc631984 | 1060 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 1061 | |
44552fb2 CB |
1062 | ret = lxc_cmd_rsp_send(fd, &rsp); |
1063 | if (ret < 0) | |
ea2a070b | 1064 | return LXC_CMD_REAP_CLIENT_FD; |
44552fb2 CB |
1065 | |
1066 | return 0; | |
dbc9832d CB |
1067 | } |
1068 | ||
2a63b5cb CB |
1069 | int lxc_cmd_add_bpf_device_cgroup(const char *name, const char *lxcpath, |
1070 | struct device_item *device) | |
1071 | { | |
1072 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
1073 | int stopped = 0; | |
1074 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
1075 | .req = { |
1076 | .cmd = LXC_CMD_ADD_BPF_DEVICE_CGROUP, | |
1077 | .data = device, | |
1078 | .datalen = sizeof(struct device_item), | |
1079 | }, | |
2a63b5cb CB |
1080 | }; |
1081 | int ret; | |
1082 | ||
1083 | if (strlen(device->access) > STRLITERALLEN("rwm")) | |
3d0327ed | 1084 | return log_error_errno(-1, EINVAL, "Invalid access mode specified %s", |
2a63b5cb CB |
1085 | device->access); |
1086 | ||
1087 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1088 | if (ret < 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1089 | return log_error_errno(-1, errno, "Failed to add new bpf device cgroup rule"); |
2a63b5cb CB |
1090 | |
1091 | return 0; | |
1092 | #else | |
3d0327ed | 1093 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
1094 | #endif |
1095 | } | |
1096 | ||
1097 | static int lxc_cmd_add_bpf_device_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
1098 | struct lxc_handler *handler, | |
1099 | struct lxc_epoll_descr *descr) | |
1100 | { | |
1101 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
1102 | __do_bpf_program_free struct bpf_program *devices = NULL; | |
1103 | struct lxc_cmd_rsp rsp = {0}; | |
1104 | struct lxc_conf *conf = handler->conf; | |
1105 | struct hierarchy *unified = handler->cgroup_ops->unified; | |
2a63b5cb CB |
1106 | int ret; |
1107 | struct lxc_list *it; | |
1108 | struct device_item *device; | |
1109 | struct bpf_program *devices_old; | |
1110 | ||
1111 | if (req->datalen <= 0) | |
ea2a070b | 1112 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1113 | |
1114 | if (req->datalen != sizeof(struct device_item)) | |
ea2a070b | 1115 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1116 | |
1117 | if (!req->data) | |
ea2a070b | 1118 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1119 | device = (struct device_item *)req->data; |
1120 | ||
1121 | rsp.ret = -1; | |
1122 | if (!unified) | |
1123 | goto respond; | |
1124 | ||
1125 | ret = bpf_list_add_device(conf, device); | |
1126 | if (ret < 0) | |
1127 | goto respond; | |
1128 | ||
1129 | devices = bpf_program_new(BPF_PROG_TYPE_CGROUP_DEVICE); | |
1130 | if (!devices) | |
1131 | goto respond; | |
1132 | ||
1133 | ret = bpf_program_init(devices); | |
1134 | if (ret) | |
1135 | goto respond; | |
1136 | ||
1137 | lxc_list_for_each(it, &conf->devices) { | |
1138 | struct device_item *cur = it->elem; | |
1139 | ||
1140 | ret = bpf_program_append_device(devices, cur); | |
1141 | if (ret) | |
1142 | goto respond; | |
1143 | } | |
1144 | ||
1145 | ret = bpf_program_finalize(devices); | |
1146 | if (ret) | |
1147 | goto respond; | |
1148 | ||
1149 | ret = bpf_program_cgroup_attach(devices, BPF_CGROUP_DEVICE, | |
1150 | unified->container_full_path, | |
1151 | BPF_F_ALLOW_MULTI); | |
1152 | if (ret) | |
1153 | goto respond; | |
1154 | ||
1155 | /* Replace old bpf program. */ | |
1156 | devices_old = move_ptr(conf->cgroup2_devices); | |
1157 | conf->cgroup2_devices = move_ptr(devices); | |
1158 | devices = move_ptr(devices_old); | |
1159 | ||
1160 | rsp.ret = 0; | |
1161 | ||
1162 | respond: | |
1163 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1164 | if (ret < 0) | |
ea2a070b | 1165 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1166 | |
1167 | return 0; | |
2a63b5cb | 1168 | #else |
3d0327ed | 1169 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
1170 | #endif |
1171 | } | |
1172 | ||
191d43cc CB |
1173 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
1174 | struct lxc_console_log *log) | |
1175 | { | |
1176 | int ret, stopped; | |
1177 | struct lxc_cmd_console_log data; | |
1178 | struct lxc_cmd_rr cmd; | |
1179 | ||
1180 | data.clear = log->clear; | |
1181 | data.read = log->read; | |
1182 | data.read_max = *log->read_max; | |
1183 | ||
1184 | cmd.req.cmd = LXC_CMD_CONSOLE_LOG; | |
1185 | cmd.req.data = &data; | |
1186 | cmd.req.datalen = sizeof(struct lxc_cmd_console_log); | |
1187 | ||
1188 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1189 | if (ret < 0) | |
1190 | return ret; | |
1191 | ||
1192 | /* There is nothing to be read from the buffer. So clear any values we | |
1193 | * where passed to clearly indicate to the user that nothing went wrong. | |
1194 | */ | |
63b74cda | 1195 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
1196 | *log->read_max = 0; |
1197 | log->data = NULL; | |
1198 | } | |
1199 | ||
1200 | /* This is a proper error so don't touch any values we were passed. */ | |
1201 | if (cmd.rsp.ret < 0) | |
1202 | return cmd.rsp.ret; | |
1203 | ||
1204 | *log->read_max = cmd.rsp.datalen; | |
1205 | log->data = cmd.rsp.data; | |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1211 | struct lxc_handler *handler, |
1212 | struct lxc_epoll_descr *descr) | |
191d43cc CB |
1213 | { |
1214 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 1215 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc CB |
1216 | const struct lxc_cmd_console_log *log = req->data; |
1217 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; | |
1218 | ||
1219 | rsp.ret = -EFAULT; | |
1220 | rsp.datalen = 0; | |
1221 | rsp.data = NULL; | |
28f3b1cd | 1222 | if (buffer_size <= 0) |
191d43cc CB |
1223 | goto out; |
1224 | ||
5928191e CB |
1225 | if (log->read || log->write_logfile) |
1226 | rsp.datalen = lxc_ringbuf_used(buf); | |
1227 | ||
191d43cc CB |
1228 | if (log->read) |
1229 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
1230 | ||
1231 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
1232 | rsp.datalen = log->read_max; | |
1233 | ||
1234 | /* there's nothing to read */ | |
63b74cda | 1235 | rsp.ret = -ENODATA; |
191d43cc | 1236 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
1237 | goto out; |
1238 | ||
63b74cda | 1239 | rsp.ret = 0; |
23e0d9af | 1240 | if (log->clear) |
43366ca2 | 1241 | lxc_ringbuf_clear(buf); /* clear the ringbuffer */ |
23e0d9af | 1242 | else if (rsp.datalen > 0) |
191d43cc CB |
1243 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
1244 | ||
1245 | out: | |
1246 | return lxc_cmd_rsp_send(fd, &rsp); | |
1247 | } | |
1248 | ||
974a8aba CB |
1249 | int lxc_cmd_serve_state_clients(const char *name, const char *lxcpath, |
1250 | lxc_state_t state) | |
1251 | { | |
1252 | int stopped; | |
1253 | ssize_t ret; | |
1254 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
1255 | .req = { |
1256 | .cmd = LXC_CMD_SERVE_STATE_CLIENTS, | |
1257 | .data = INT_TO_PTR(state) | |
1258 | }, | |
974a8aba CB |
1259 | }; |
1260 | ||
1261 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1262 | if (ret < 0) |
1263 | return log_error_errno(-1, errno, "Failed to serve state clients"); | |
974a8aba CB |
1264 | |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | static int lxc_cmd_serve_state_clients_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1269 | struct lxc_handler *handler, |
1270 | struct lxc_epoll_descr *descr) | |
974a8aba CB |
1271 | { |
1272 | int ret; | |
1273 | lxc_state_t state = PTR_TO_INT(req->data); | |
1274 | struct lxc_cmd_rsp rsp = {0}; | |
1275 | ||
1276 | ret = lxc_serve_state_clients(handler->name, handler, state); | |
1277 | if (ret < 0) | |
ea2a070b | 1278 | return LXC_CMD_REAP_CLIENT_FD; |
974a8aba CB |
1279 | |
1280 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1281 | if (ret < 0) | |
ea2a070b | 1282 | return LXC_CMD_REAP_CLIENT_FD; |
974a8aba CB |
1283 | |
1284 | return 0; | |
974a8aba CB |
1285 | } |
1286 | ||
cdb2a47f CB |
1287 | int lxc_cmd_seccomp_notify_add_listener(const char *name, const char *lxcpath, |
1288 | int fd, | |
1289 | /* unused */ unsigned int command, | |
1290 | /* unused */ unsigned int flags) | |
1291 | { | |
1292 | ||
c3e3c21a | 1293 | #ifdef HAVE_SECCOMP_NOTIFY |
cdb2a47f CB |
1294 | int ret, stopped; |
1295 | struct lxc_cmd_rr cmd = { | |
1296 | .req = { | |
1297 | .cmd = LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER, | |
1298 | .data = INT_TO_PTR(fd), | |
1299 | }, | |
1300 | }; | |
1301 | ||
1302 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1303 | if (ret < 0) |
1304 | return log_error_errno(-1, errno, "Failed to add seccomp listener"); | |
cdb2a47f CB |
1305 | |
1306 | return cmd.rsp.ret; | |
1307 | #else | |
3d0327ed | 1308 | return ret_set_errno(-1, ENOSYS); |
cdb2a47f CB |
1309 | #endif |
1310 | } | |
1311 | ||
1312 | static int lxc_cmd_seccomp_notify_add_listener_callback(int fd, | |
1313 | struct lxc_cmd_req *req, | |
1314 | struct lxc_handler *handler, | |
1315 | struct lxc_epoll_descr *descr) | |
1316 | { | |
1317 | struct lxc_cmd_rsp rsp = {0}; | |
cdb2a47f | 1318 | |
c3e3c21a CB |
1319 | #ifdef HAVE_SECCOMP_NOTIFY |
1320 | int ret; | |
f62cf1d4 | 1321 | __do_close int recv_fd = -EBADF; |
cdb2a47f | 1322 | |
c3e3c21a CB |
1323 | ret = lxc_abstract_unix_recv_fds(fd, &recv_fd, 1, NULL, 0); |
1324 | if (ret <= 0) { | |
1325 | rsp.ret = -errno; | |
1326 | goto out; | |
cdb2a47f CB |
1327 | } |
1328 | ||
c3e3c21a CB |
1329 | if (!handler->conf->seccomp.notifier.wants_supervision || |
1330 | handler->conf->seccomp.notifier.proxy_fd < 0) { | |
1331 | SYSERROR("No seccomp proxy fd specified"); | |
1332 | rsp.ret = -EINVAL; | |
1333 | goto out; | |
1334 | } | |
cdb2a47f | 1335 | |
c3e3c21a | 1336 | ret = lxc_mainloop_add_handler(descr, recv_fd, seccomp_notify_handler, |
cdb2a47f | 1337 | handler); |
c3e3c21a CB |
1338 | if (ret < 0) { |
1339 | rsp.ret = -errno; | |
1340 | goto out; | |
1341 | } | |
68a9e3eb | 1342 | move_fd(recv_fd); |
cdb2a47f | 1343 | |
c3e3c21a | 1344 | out: |
cdb2a47f CB |
1345 | #else |
1346 | rsp.ret = -ENOSYS; | |
cdb2a47f | 1347 | |
c3e3c21a CB |
1348 | #endif |
1349 | return lxc_cmd_rsp_send(fd, &rsp); | |
cdb2a47f CB |
1350 | } |
1351 | ||
018051e3 CB |
1352 | int lxc_cmd_freeze(const char *name, const char *lxcpath, int timeout) |
1353 | { | |
1354 | int ret, stopped; | |
1355 | struct lxc_cmd_rr cmd = { | |
1356 | .req = { | |
1357 | .cmd = LXC_CMD_FREEZE, | |
1358 | .data = INT_TO_PTR(timeout), | |
1359 | }, | |
1360 | }; | |
1361 | ||
1362 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1363 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1364 | return log_error_errno(-1, errno, "Failed to freeze container"); |
018051e3 CB |
1365 | |
1366 | return cmd.rsp.ret; | |
1367 | } | |
1368 | ||
1369 | static int lxc_cmd_freeze_callback(int fd, struct lxc_cmd_req *req, | |
1370 | struct lxc_handler *handler, | |
1371 | struct lxc_epoll_descr *descr) | |
1372 | { | |
1373 | int timeout = PTR_TO_INT(req->data); | |
1374 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1375 | .ret = -ENOENT, |
018051e3 CB |
1376 | }; |
1377 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1378 | ||
1973b62a | 1379 | if (pure_unified_layout(ops)) |
018051e3 CB |
1380 | rsp.ret = ops->freeze(ops, timeout); |
1381 | ||
1382 | return lxc_cmd_rsp_send(fd, &rsp); | |
1383 | } | |
1384 | ||
1385 | int lxc_cmd_unfreeze(const char *name, const char *lxcpath, int timeout) | |
1386 | { | |
1387 | int ret, stopped; | |
1388 | struct lxc_cmd_rr cmd = { | |
1389 | .req = { | |
1390 | .cmd = LXC_CMD_UNFREEZE, | |
1391 | .data = INT_TO_PTR(timeout), | |
1392 | }, | |
1393 | }; | |
1394 | ||
1395 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1396 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1397 | return log_error_errno(-1, errno, "Failed to unfreeze container"); |
018051e3 CB |
1398 | |
1399 | return cmd.rsp.ret; | |
1400 | } | |
1401 | ||
1402 | static int lxc_cmd_unfreeze_callback(int fd, struct lxc_cmd_req *req, | |
1403 | struct lxc_handler *handler, | |
1404 | struct lxc_epoll_descr *descr) | |
1405 | { | |
1406 | int timeout = PTR_TO_INT(req->data); | |
1407 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1408 | .ret = -ENOENT, |
018051e3 CB |
1409 | }; |
1410 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1411 | ||
1973b62a | 1412 | if (pure_unified_layout(ops)) |
018051e3 CB |
1413 | rsp.ret = ops->unfreeze(ops, timeout); |
1414 | ||
1415 | return lxc_cmd_rsp_send(fd, &rsp); | |
1416 | } | |
1417 | ||
bad788b0 CB |
1418 | int lxc_cmd_get_cgroup2_fd(const char *name, const char *lxcpath) |
1419 | { | |
1420 | int ret, stopped; | |
1421 | struct lxc_cmd_rr cmd = { | |
1422 | .req = { | |
1423 | .cmd = LXC_CMD_GET_CGROUP2_FD, | |
1424 | }, | |
1425 | }; | |
1426 | ||
1427 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
23a917e5 CB |
1428 | if (ret < 0) |
1429 | return -1; | |
1430 | ||
1431 | if (cmd.rsp.ret < 0) | |
a5263e59 | 1432 | return log_debug_errno(cmd.rsp.ret, -cmd.rsp.ret, "Failed to receive cgroup2 fd"); |
bad788b0 CB |
1433 | |
1434 | return PTR_TO_INT(cmd.rsp.data); | |
1435 | } | |
1436 | ||
a900cbaf WB |
1437 | static int lxc_cmd_get_cgroup2_fd_callback_do(int fd, struct lxc_cmd_req *req, |
1438 | struct lxc_handler *handler, | |
1439 | struct lxc_epoll_descr *descr, | |
1440 | bool limiting_cgroup) | |
bad788b0 CB |
1441 | { |
1442 | struct lxc_cmd_rsp rsp = { | |
1443 | .ret = -EINVAL, | |
1444 | }; | |
1445 | struct cgroup_ops *ops = handler->cgroup_ops; | |
a900cbaf | 1446 | int ret, send_fd; |
bad788b0 | 1447 | |
1973b62a | 1448 | if (!pure_unified_layout(ops) || !ops->unified) |
bad788b0 CB |
1449 | return lxc_cmd_rsp_send(fd, &rsp); |
1450 | ||
a900cbaf WB |
1451 | send_fd = limiting_cgroup ? ops->unified->cgfd_limit |
1452 | : ops->unified->cgfd_con; | |
1453 | ||
bad788b0 | 1454 | rsp.ret = 0; |
a900cbaf | 1455 | ret = lxc_abstract_unix_send_fds(fd, &send_fd, 1, &rsp, sizeof(rsp)); |
bad788b0 | 1456 | if (ret < 0) |
a804c19b | 1457 | return log_error(LXC_CMD_REAP_CLIENT_FD, "Failed to send cgroup2 fd"); |
bad788b0 CB |
1458 | |
1459 | return 0; | |
1460 | } | |
1461 | ||
a900cbaf WB |
1462 | static int lxc_cmd_get_cgroup2_fd_callback(int fd, struct lxc_cmd_req *req, |
1463 | struct lxc_handler *handler, | |
1464 | struct lxc_epoll_descr *descr) | |
1465 | { | |
1466 | return lxc_cmd_get_cgroup2_fd_callback_do(fd, req, handler, descr, | |
1467 | false); | |
1468 | } | |
1469 | ||
1470 | static int lxc_cmd_get_limiting_cgroup2_fd_callback(int fd, | |
1471 | struct lxc_cmd_req *req, | |
1472 | struct lxc_handler *handler, | |
1473 | struct lxc_epoll_descr *descr) | |
1474 | { | |
1475 | return lxc_cmd_get_cgroup2_fd_callback_do(fd, req, handler, descr, | |
1476 | true); | |
1477 | } | |
1478 | ||
ef6e34ee | 1479 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1480 | struct lxc_handler *handler, |
1481 | struct lxc_epoll_descr *descr) | |
724e753c | 1482 | { |
cdb2a47f CB |
1483 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *, |
1484 | struct lxc_epoll_descr *); | |
ef6e34ee DE |
1485 | |
1486 | callback cb[LXC_CMD_MAX] = { | |
2a63b5cb CB |
1487 | [LXC_CMD_CONSOLE] = lxc_cmd_console_callback, |
1488 | [LXC_CMD_TERMINAL_WINCH] = lxc_cmd_terminal_winch_callback, | |
1489 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, | |
1490 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1491 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1492 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1493 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1494 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1495 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1496 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1497 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
1498 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, | |
1499 | [LXC_CMD_SERVE_STATE_CLIENTS] = lxc_cmd_serve_state_clients_callback, | |
1500 | [LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER] = lxc_cmd_seccomp_notify_add_listener_callback, | |
1501 | [LXC_CMD_ADD_BPF_DEVICE_CGROUP] = lxc_cmd_add_bpf_device_cgroup_callback, | |
018051e3 CB |
1502 | [LXC_CMD_FREEZE] = lxc_cmd_freeze_callback, |
1503 | [LXC_CMD_UNFREEZE] = lxc_cmd_unfreeze_callback, | |
bad788b0 | 1504 | [LXC_CMD_GET_CGROUP2_FD] = lxc_cmd_get_cgroup2_fd_callback, |
746aab51 | 1505 | [LXC_CMD_GET_INIT_PIDFD] = lxc_cmd_get_init_pidfd_callback, |
a900cbaf WB |
1506 | [LXC_CMD_GET_LIMITING_CGROUP] = lxc_cmd_get_limiting_cgroup_callback, |
1507 | [LXC_CMD_GET_LIMITING_CGROUP2_FD] = lxc_cmd_get_limiting_cgroup2_fd_callback, | |
724e753c MN |
1508 | }; |
1509 | ||
23a917e5 | 1510 | if (req->cmd >= LXC_CMD_MAX) |
769b88ea | 1511 | return log_trace_errno(-1, EINVAL, "Invalid command id %d", req->cmd); |
23a917e5 | 1512 | |
cdb2a47f | 1513 | return cb[req->cmd](fd, req, handler, descr); |
724e753c MN |
1514 | } |
1515 | ||
ef6e34ee | 1516 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
cdb2a47f | 1517 | struct lxc_epoll_descr *descr, const lxc_cmd_t cmd) |
724e753c | 1518 | { |
3dfe6f8d | 1519 | lxc_terminal_free(handler->conf, fd); |
724e753c | 1520 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 | 1521 | |
cd5369b0 | 1522 | if (cmd == LXC_CMD_ADD_STATE_CLIENT) { |
ab92468c CB |
1523 | struct lxc_list *cur, *next; |
1524 | ||
cdb2a47f CB |
1525 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
1526 | struct lxc_state_client *client = cur->elem; | |
1527 | ||
1528 | if (client->clientfd != fd) | |
1529 | continue; | |
1530 | ||
ab92468c CB |
1531 | /* |
1532 | * Only kick client from list so it can't be found | |
1533 | * anymore. The actual close happens, as for all other | |
1534 | * file descriptors, below. | |
1535 | */ | |
cdb2a47f | 1536 | lxc_list_del(cur); |
cdb2a47f CB |
1537 | free(cur->elem); |
1538 | free(cur); | |
ab92468c | 1539 | |
39e2a438 CB |
1540 | /* |
1541 | * No need to walk the whole list. If we found the state | |
cdb2a47f CB |
1542 | * client fd there can't be a second one. |
1543 | */ | |
ea2a070b | 1544 | TRACE("Found state client fd %d in state client list for command \"%s\"", fd, lxc_cmd_str(cmd)); |
ab92468c | 1545 | break; |
cdb2a47f | 1546 | } |
39e2a438 CB |
1547 | |
1548 | /* | |
1549 | * We didn't add the state client to the list. Either because | |
1550 | * we failed to allocate memory (unlikely) or because the state | |
1551 | * was already reached by the time we were ready to add it. So | |
1552 | * fallthrough and clean it up. | |
1553 | */ | |
ea2a070b | 1554 | TRACE("Closing state client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
f6fc1565 | 1555 | } |
cd5369b0 | 1556 | |
ea2a070b | 1557 | TRACE("Closing client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
cd5369b0 | 1558 | close(fd); |
724e753c MN |
1559 | } |
1560 | ||
84c92abd DE |
1561 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1562 | struct lxc_epoll_descr *descr) | |
724e753c | 1563 | { |
5265a60c | 1564 | __do_free void *reqdata = NULL; |
724e753c | 1565 | int ret; |
ef6e34ee | 1566 | struct lxc_cmd_req req; |
724e753c MN |
1567 | struct lxc_handler *handler = data; |
1568 | ||
aae93dd3 | 1569 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
ded1d23f | 1570 | if (ret < 0) { |
ea2a070b | 1571 | SYSERROR("Failed to receive data on command socket for command \"%s\"", lxc_cmd_str(req.cmd)); |
9044b79e | 1572 | |
1573 | if (errno == EACCES) { | |
1574 | /* We don't care for the peer, just send and close. */ | |
ea2a070b | 1575 | struct lxc_cmd_rsp rsp = { |
f7a97743 | 1576 | .ret = -EPERM, |
ea2a070b | 1577 | }; |
9044b79e | 1578 | |
1579 | lxc_cmd_rsp_send(fd, &rsp); | |
1580 | } | |
1581 | ||
724e753c MN |
1582 | goto out_close; |
1583 | } | |
1584 | ||
fe84a562 | 1585 | if (ret == 0) |
724e753c | 1586 | goto out_close; |
724e753c | 1587 | |
ef6e34ee | 1588 | if (ret != sizeof(req)) { |
ea2a070b | 1589 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1590 | goto out_close; |
1591 | } | |
1592 | ||
ea2a070b CB |
1593 | if ((req.datalen > LXC_CMD_DATA_MAX) && (req.cmd != LXC_CMD_CONSOLE_LOG)) { |
1594 | ERROR("Received command data length %d is too large for command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); | |
724e753c MN |
1595 | goto out_close; |
1596 | } | |
1597 | ||
ef6e34ee | 1598 | if (req.datalen > 0) { |
5265a60c | 1599 | reqdata = must_realloc(NULL, req.datalen); |
e3233f26 | 1600 | ret = lxc_recv_nointr(fd, reqdata, req.datalen, 0); |
ef6e34ee | 1601 | if (ret != req.datalen) { |
ea2a070b | 1602 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1603 | goto out_close; |
1604 | } | |
fe84a562 | 1605 | |
ef6e34ee DE |
1606 | req.data = reqdata; |
1607 | } | |
1608 | ||
cdb2a47f | 1609 | ret = lxc_cmd_process(fd, &req, handler, descr); |
724e753c | 1610 | if (ret) { |
fe84a562 | 1611 | /* This is not an error, but only a request to close fd. */ |
724e753c MN |
1612 | goto out_close; |
1613 | } | |
1614 | ||
1615 | out: | |
f7a97743 | 1616 | return LXC_MAINLOOP_CONTINUE; |
fe84a562 | 1617 | |
724e753c | 1618 | out_close: |
f6fc1565 | 1619 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
1620 | goto out; |
1621 | } | |
1622 | ||
84c92abd DE |
1623 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
1624 | struct lxc_epoll_descr *descr) | |
724e753c | 1625 | { |
f62cf1d4 | 1626 | __do_close int connection = -EBADF; |
fe84a562 | 1627 | int opt = 1, ret = -1; |
724e753c MN |
1628 | |
1629 | connection = accept(fd, NULL, 0); | |
6c6497ea CB |
1630 | if (connection < 0) |
1631 | return log_error_errno(LXC_MAINLOOP_ERROR, errno, "Failed to accept connection to run command"); | |
724e753c | 1632 | |
fe84a562 | 1633 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1634 | if (ret < 0) |
1635 | return log_error_errno(ret, errno, "Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc | 1636 | |
fe84a562 | 1637 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
6c6497ea CB |
1638 | if (ret < 0) |
1639 | return log_error_errno(ret, errno, "Failed to enable necessary credentials on command socket"); | |
724e753c | 1640 | |
ef6e34ee | 1641 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
6c6497ea CB |
1642 | if (ret) |
1643 | return log_error(ret, "Failed to add command handler"); | |
724e753c | 1644 | |
ea2a070b | 1645 | TRACE("Accepted new client as fd %d on command server fd %d", connection, fd); |
240fecd0 | 1646 | move_fd(connection); |
724e753c | 1647 | return ret; |
724e753c MN |
1648 | } |
1649 | ||
9dfa4041 | 1650 | int lxc_cmd_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 1651 | { |
f62cf1d4 | 1652 | __do_close int fd = -EBADF; |
c13e7111 | 1653 | int ret; |
b1234129 | 1654 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
724e753c | 1655 | |
5b46db1a | 1656 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, NULL, suffix); |
fe84a562 | 1657 | if (ret < 0) |
9ba8130c | 1658 | return -1; |
724e753c | 1659 | |
aae93dd3 | 1660 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 1661 | if (fd < 0) { |
08aa08fe | 1662 | if (errno == EADDRINUSE) |
fe84a562 | 1663 | ERROR("Container \"%s\" appears to be already running", name); |
6d1400b5 | 1664 | |
6c6497ea | 1665 | return log_error_errno(-1, errno, "Failed to create command socket %s", &path[1]); |
724e753c MN |
1666 | } |
1667 | ||
fe84a562 | 1668 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1669 | if (ret < 0) |
1670 | return log_error_errno(-1, errno, "Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f | 1671 | |
6c6497ea | 1672 | return log_trace(move_fd(fd), "Created abstract unix socket \"%s\"", &path[1]); |
d2e30e99 DE |
1673 | } |
1674 | ||
fe84a562 | 1675 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 1676 | struct lxc_handler *handler) |
d2e30e99 | 1677 | { |
fe84a562 | 1678 | int ret; |
d2e30e99 | 1679 | |
ea2a070b | 1680 | ret = lxc_mainloop_add_handler(descr, handler->conf->maincmd_fd, lxc_cmd_accept, handler); |
6c6497ea | 1681 | if (ret < 0) |
ea2a070b | 1682 | return log_error(ret, "Failed to add handler for command socket fd %d", handler->conf->maincmd_fd); |
724e753c MN |
1683 | |
1684 | return ret; | |
1685 | } |