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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" |
5f126977 | 20 | #include "cgroups/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] = { |
7e85a2c4 | 68 | [LXC_CMD_GET_TTY_FD] = "get_tty_fd", |
2a63b5cb CB |
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", |
a9b642ee CB |
87 | [LXC_CMD_GET_LIMIT_CGROUP] = "get_limit_cgroup", |
88 | [LXC_CMD_GET_LIMIT_CGROUP2_FD] = "get_limit_cgroup2_fd", | |
f797f05e | 89 | [LXC_CMD_GET_DEVPTS_FD] = "get_devpts_fd", |
21405769 | 90 | [LXC_CMD_GET_SECCOMP_NOTIFY_FD] = "get_seccomp_notify_fd", |
ef6e048a | 91 | [LXC_CMD_GET_CGROUP_CTX] = "get_cgroup_ctx", |
c206ac24 CB |
92 | [LXC_CMD_GET_CGROUP_FD] = "get_cgroup_fd", |
93 | [LXC_CMD_GET_LIMIT_CGROUP_FD] = "get_limit_cgroup_fd", | |
ef6e34ee | 94 | }; |
724e753c | 95 | |
f371aca9 | 96 | if (cmd >= LXC_CMD_MAX) |
a8007512 | 97 | return "Invalid request"; |
fe84a562 | 98 | |
ef6e34ee DE |
99 | return cmdname[cmd]; |
100 | } | |
101 | ||
ef6e048a CB |
102 | static int __transfer_cgroup_ctx_fds(struct unix_fds *fds, struct cgroup_ctx *ctx) |
103 | { | |
104 | /* This shouldn't be able to happen but better safe than sorry. */ | |
105 | if (ctx->fd_len != fds->fd_count_ret || | |
106 | fds->fd_count_ret > CGROUP_CTX_MAX_FD) | |
107 | return syswarn_set(-EINVAL, "Unexpected number of file descriptors received %u != %u", | |
108 | ctx->fd_len, fds->fd_count_ret); | |
109 | ||
110 | memcpy(ctx->fd, fds->fd, ctx->fd_len * sizeof(__s32)); | |
111 | fds->fd_count_ret = 0; | |
112 | return 0; | |
113 | } | |
114 | ||
abb6f657 CB |
115 | static int __transfer_cgroup_fd(struct unix_fds *fds, struct cgroup_fd *fd) |
116 | { | |
117 | fd->fd = move_fd(fds->fd[0]); | |
118 | return 0; | |
119 | } | |
120 | ||
3a9daa04 CB |
121 | static ssize_t lxc_cmd_rsp_recv_fds(int fd_sock, struct unix_fds *fds, |
122 | struct lxc_cmd_rsp *rsp, | |
123 | const char *cur_cmdstr) | |
124 | { | |
125 | ssize_t ret; | |
126 | ||
127 | ret = lxc_abstract_unix_recv_fds(fd_sock, fds, rsp, sizeof(*rsp)); | |
128 | if (ret < 0) | |
129 | return ret; | |
130 | ||
131 | /* | |
132 | * If we end up here with fewer or more file descriptors the caller | |
133 | * must have set flags to indicate that they are fine with this. | |
134 | * Otherwise the call would have failed. | |
135 | */ | |
136 | ||
137 | if (fds->flags & UNIX_FDS_RECEIVED_EXACT) | |
138 | return log_info(ret, "Received exact number of file descriptors %u == %u", | |
139 | fds->fd_count_max, fds->fd_count_ret); | |
140 | ||
141 | if (fds->flags & UNIX_FDS_RECEIVED_LESS) | |
142 | return log_info(ret, "Received less file descriptors %u < %u", | |
143 | fds->fd_count_ret, fds->fd_count_max); | |
144 | ||
145 | if (fds->flags & UNIX_FDS_RECEIVED_MORE) | |
146 | return log_info(ret, "Received more file descriptors (excessive fds were automatically closed) %u > %u", | |
147 | fds->fd_count_ret, fds->fd_count_max); | |
148 | ||
149 | INFO("Command \"%s\" received response", cur_cmdstr); | |
150 | return ret; | |
151 | } | |
152 | ||
ef6e34ee DE |
153 | /* |
154 | * lxc_cmd_rsp_recv: Receive a response to a command | |
155 | * | |
156 | * @sock : the socket connected to the container | |
157 | * @cmd : command to put response in | |
158 | * | |
159 | * Returns the size of the response message or < 0 on failure | |
160 | * | |
161 | * Note that if the command response datalen > 0, then data is | |
162 | * a malloc()ed buffer and should be free()ed by the caller. If | |
163 | * the response data is <= a void * worth of data, it will be | |
164 | * stored directly in data and datalen will be 0. | |
165 | * | |
7e85a2c4 CB |
166 | * As a special case, the response for LXC_CMD_GET_TTY_FD is created here as |
167 | * it contains an fd for the ptx pty passed through the unix socket. | |
ef6e34ee | 168 | */ |
3a9daa04 | 169 | static ssize_t lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) |
ef6e34ee | 170 | { |
5f241268 | 171 | __do_free void *__data = NULL; |
3a9daa04 CB |
172 | call_cleaner(put_unix_fds) struct unix_fds *fds = &(struct unix_fds){ |
173 | .fd[0 ... KERNEL_SCM_MAX_FD - 1] = -EBADF, | |
174 | }; | |
ef6e34ee | 175 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
3a9daa04 | 176 | int cur_cmd = cmd->req.cmd; |
1454e5d9 | 177 | const char *cur_cmdstr; |
3a9daa04 | 178 | ssize_t bytes_recv; |
ef6e34ee | 179 | |
abb6f657 CB |
180 | /* |
181 | * Determine whether this command will receive file descriptors and how | |
182 | * many at most. | |
183 | */ | |
1454e5d9 CB |
184 | cur_cmdstr = lxc_cmd_str(cur_cmd); |
185 | switch (cur_cmd) { | |
c206ac24 CB |
186 | case LXC_CMD_GET_CGROUP_FD: |
187 | __fallthrough; | |
188 | case LXC_CMD_GET_LIMIT_CGROUP_FD: | |
189 | __fallthrough; | |
f8cc4ae8 CB |
190 | case LXC_CMD_GET_CGROUP2_FD: |
191 | __fallthrough; | |
a9b642ee | 192 | case LXC_CMD_GET_LIMIT_CGROUP2_FD: |
f8cc4ae8 CB |
193 | __fallthrough; |
194 | case LXC_CMD_GET_INIT_PIDFD: | |
195 | __fallthrough; | |
196 | case LXC_CMD_GET_SECCOMP_NOTIFY_FD: | |
197 | __fallthrough; | |
198 | case LXC_CMD_GET_DEVPTS_FD: | |
3a9daa04 CB |
199 | fds->fd_count_max = 1; |
200 | /* | |
201 | * The kernel might not support the required features or the | |
202 | * server might be too old. | |
203 | */ | |
204 | fds->flags = UNIX_FDS_ACCEPT_EXACT | UNIX_FDS_ACCEPT_NONE; | |
205 | break; | |
7e85a2c4 | 206 | case LXC_CMD_GET_TTY_FD: |
3a9daa04 CB |
207 | /* |
208 | * The requested terminal can be busy so it's perfectly fine | |
209 | * for LXC_CMD_GET_TTY to receive no file descriptor. | |
210 | */ | |
f8cc4ae8 | 211 | fds->fd_count_max = 1; |
3a9daa04 | 212 | fds->flags = UNIX_FDS_ACCEPT_EXACT | UNIX_FDS_ACCEPT_NONE; |
f8cc4ae8 | 213 | break; |
ef6e048a CB |
214 | case LXC_CMD_GET_CGROUP_CTX: |
215 | fds->fd_count_max = CGROUP_CTX_MAX_FD; | |
3a9daa04 | 216 | fds->flags |= UNIX_FDS_ACCEPT_LESS; |
f8cc4ae8 CB |
217 | break; |
218 | default: | |
219 | fds->fd_count_max = 0; | |
ef6e048a | 220 | break; |
f8cc4ae8 | 221 | } |
abb6f657 CB |
222 | |
223 | /* Receive the first response including file descriptors if any. */ | |
3a9daa04 CB |
224 | bytes_recv = lxc_cmd_rsp_recv_fds(sock, fds, rsp, cur_cmdstr); |
225 | if (bytes_recv < 0) | |
226 | return bytes_recv; | |
ef6e34ee | 227 | |
abb6f657 CB |
228 | /* |
229 | * Ensure that no excessive data is sent unless someone retrieves the | |
230 | * console ringbuffer. | |
231 | */ | |
232 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && | |
233 | (cur_cmd != LXC_CMD_CONSOLE_LOG)) | |
060aaa39 | 234 | return syserror_set(-E2BIG, "Response data for command \"%s\" is too long: %d bytes > %d", |
abb6f657 | 235 | cur_cmdstr, rsp->datalen, LXC_CMD_DATA_MAX); |
ef6e34ee | 236 | |
abb6f657 CB |
237 | /* |
238 | * Prepare buffer for any command that expects to receive additional | |
239 | * data. Note that some don't want any additional data. | |
240 | */ | |
1454e5d9 | 241 | switch (cur_cmd) { |
abb6f657 | 242 | case LXC_CMD_GET_CGROUP2_FD: /* no data */ |
c206ac24 | 243 | __fallthrough; |
abb6f657 | 244 | case LXC_CMD_GET_LIMIT_CGROUP2_FD: /* no data */ |
2092492c | 245 | __fallthrough; |
abb6f657 | 246 | case LXC_CMD_GET_INIT_PIDFD: /* no data */ |
2092492c | 247 | __fallthrough; |
abb6f657 | 248 | case LXC_CMD_GET_DEVPTS_FD: /* no data */ |
2092492c | 249 | __fallthrough; |
abb6f657 | 250 | case LXC_CMD_GET_SECCOMP_NOTIFY_FD: /* no data */ |
3a9daa04 CB |
251 | rsp->data = INT_TO_PTR(move_fd(fds->fd[0])); |
252 | return log_debug(0, "Finished processing \"%s\" with file descriptor %d", cur_cmdstr, PTR_TO_INT(rsp->data)); | |
abb6f657 | 253 | case LXC_CMD_GET_CGROUP_FD: /* data */ |
2092492c | 254 | __fallthrough; |
abb6f657 CB |
255 | case LXC_CMD_GET_LIMIT_CGROUP_FD: /* data */ |
256 | if (rsp->datalen > sizeof(struct cgroup_fd)) | |
060aaa39 | 257 | return syserror_set(-EINVAL, "Invalid response size from server for \"%s\"", cur_cmdstr); |
ef6e048a CB |
258 | |
259 | /* Don't pointlessly allocate. */ | |
260 | rsp->data = (void *)cmd->req.data; | |
2092492c | 261 | break; |
abb6f657 CB |
262 | case LXC_CMD_GET_CGROUP_CTX: /* data */ |
263 | if (rsp->datalen > sizeof(struct cgroup_ctx)) | |
060aaa39 | 264 | return syserror_set(-EINVAL, "Invalid response size from server for \"%s\"", cur_cmdstr); |
abb6f657 CB |
265 | |
266 | /* Don't pointlessly allocate. */ | |
267 | rsp->data = (void *)cmd->req.data; | |
2092492c | 268 | break; |
7e85a2c4 | 269 | case LXC_CMD_GET_TTY_FD: /* data */ |
abb6f657 CB |
270 | /* |
271 | * recv() returns 0 bytes when a tty cannot be allocated, | |
3a9daa04 | 272 | * rsp->ret is < 0 when the peer permission check failed. |
abb6f657 | 273 | */ |
3a9daa04 | 274 | if (bytes_recv == 0 || rsp->ret < 0) |
abb6f657 | 275 | return 0; |
21405769 | 276 | |
5f241268 CB |
277 | __data = malloc(sizeof(struct lxc_cmd_tty_rsp_data)); |
278 | if (__data) { | |
279 | struct lxc_cmd_tty_rsp_data *tty = __data; | |
23a917e5 | 280 | |
5f241268 CB |
281 | tty->ptxfd = move_fd(fds->fd[0]); |
282 | tty->ttynum = PTR_TO_INT(rsp->data); | |
283 | rsp->datalen = 0; | |
284 | rsp->data = tty; | |
285 | break; | |
286 | } | |
060aaa39 | 287 | return syserror_set(-ENOMEM, "Failed to receive response for command \"%s\"", cur_cmdstr); |
abb6f657 | 288 | case LXC_CMD_CONSOLE_LOG: /* data */ |
5f241268 CB |
289 | __data = zalloc(rsp->datalen + 1); |
290 | rsp->data = __data; | |
abb6f657 CB |
291 | break; |
292 | default: /* catch any additional command */ | |
293 | if (rsp->datalen > 0) { | |
5f241268 CB |
294 | __data = zalloc(rsp->datalen); |
295 | rsp->data = __data; | |
abb6f657 CB |
296 | } |
297 | break; | |
298 | } | |
ef6e34ee | 299 | |
3a9daa04 CB |
300 | if (rsp->datalen > 0) { |
301 | int err; | |
302 | ||
abb6f657 | 303 | /* |
3a9daa04 CB |
304 | * All commands ending up here expect data so rsp->data must be valid. |
305 | * Either static or allocated memory. | |
abb6f657 | 306 | */ |
3a9daa04 | 307 | if (!rsp->data) |
060aaa39 | 308 | return syserror_set(-ENOMEM, "Failed to prepare response buffer for command \"%s\"", |
3a9daa04 CB |
309 | cur_cmdstr); |
310 | ||
311 | bytes_recv = lxc_recv_nointr(sock, rsp->data, rsp->datalen, 0); | |
312 | if (bytes_recv != rsp->datalen) | |
2d7b0895 | 313 | return syserror("Failed to receive response data for command \"%s\": %zd != %d", |
3a9daa04 CB |
314 | cur_cmdstr, bytes_recv, rsp->datalen); |
315 | ||
316 | switch (cur_cmd) { | |
317 | case LXC_CMD_GET_CGROUP_CTX: | |
318 | err = __transfer_cgroup_ctx_fds(fds, rsp->data); | |
319 | break; | |
320 | case LXC_CMD_GET_CGROUP_FD: | |
321 | __fallthrough; | |
322 | case LXC_CMD_GET_LIMIT_CGROUP_FD: | |
323 | err = __transfer_cgroup_fd(fds, rsp->data); | |
324 | break; | |
325 | default: | |
326 | err = 0; | |
327 | } | |
328 | if (err < 0) | |
9fc21b2d | 329 | return syserror_ret(err, "Failed to transfer file descriptors for command \"%s\"", cur_cmdstr); |
ef6e048a | 330 | } |
724e753c | 331 | |
5f241268 | 332 | move_ptr(__data); |
3a9daa04 | 333 | return bytes_recv; |
724e753c MN |
334 | } |
335 | ||
ef6e34ee DE |
336 | /* |
337 | * lxc_cmd_rsp_send: Send a command response | |
338 | * | |
339 | * @fd : file descriptor of socket to send response on | |
340 | * @rsp : response to send | |
341 | * | |
342 | * Returns 0 on success, < 0 on failure | |
343 | */ | |
4b5f4bdc | 344 | static int __lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) |
ef6e34ee | 345 | { |
fe84a562 | 346 | ssize_t ret; |
ef6e34ee | 347 | |
7fbb15ec | 348 | ret = lxc_send_nointr(fd, rsp, sizeof(*rsp), MSG_NOSIGNAL); |
6c6497ea | 349 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) |
2d7b0895 | 350 | return syserror("Failed to send command response %zd", ret); |
ef6e34ee | 351 | |
a674dfe1 | 352 | if (!rsp->data || rsp->datalen <= 0) |
fe84a562 CB |
353 | return 0; |
354 | ||
7fbb15ec | 355 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); |
6c6497ea | 356 | if (ret < 0 || ret != (ssize_t)rsp->datalen) |
4b5f4bdc | 357 | return syswarn(-errno, "Failed to send command response %zd", ret); |
fe84a562 | 358 | |
ef6e34ee DE |
359 | return 0; |
360 | } | |
361 | ||
4b5f4bdc CB |
362 | static inline int lxc_cmd_rsp_send_reap(int fd, struct lxc_cmd_rsp *rsp) |
363 | { | |
364 | int ret; | |
365 | ||
366 | ret = __lxc_cmd_rsp_send(fd, rsp); | |
367 | if (ret < 0) | |
368 | return ret; | |
369 | ||
370 | return LXC_CMD_REAP_CLIENT_FD; | |
371 | } | |
372 | ||
254a22e1 CB |
373 | static inline int lxc_cmd_rsp_send_keep(int fd, struct lxc_cmd_rsp *rsp) |
374 | { | |
375 | int ret; | |
376 | ||
377 | ret = __lxc_cmd_rsp_send(fd, rsp); | |
378 | if (ret < 0) | |
379 | return ret; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
46b576e5 | 384 | static inline int rsp_one_fd_reap(int fd, int fd_send, struct lxc_cmd_rsp *rsp) |
c2f40088 | 385 | { |
124b60ec | 386 | ssize_t ret; |
c2f40088 CB |
387 | |
388 | ret = lxc_abstract_unix_send_fds(fd, &fd_send, 1, rsp, sizeof(*rsp)); | |
389 | if (ret < 0) | |
390 | return ret; | |
391 | ||
124b60ec CB |
392 | if (rsp->data && rsp->datalen > 0) { |
393 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
394 | if (ret < 0 || ret != (ssize_t)rsp->datalen) | |
395 | return syswarn(-errno, "Failed to send command response %zd", ret); | |
396 | } | |
397 | ||
c2f40088 CB |
398 | return LXC_CMD_REAP_CLIENT_FD; |
399 | } | |
400 | ||
d2560c4e CB |
401 | static inline int rsp_one_fd_keep(int fd, int fd_send, struct lxc_cmd_rsp *rsp) |
402 | { | |
403 | int ret; | |
404 | ||
46b576e5 | 405 | ret = rsp_one_fd_reap(fd, fd_send, rsp); |
d2560c4e CB |
406 | if (ret == LXC_CMD_REAP_CLIENT_FD) |
407 | ret = LXC_CMD_KEEP_CLIENT_FD; | |
408 | ||
409 | return ret; | |
410 | } | |
411 | ||
46b576e5 CB |
412 | __access_r(3, 2) static int rsp_many_fds_reap(int fd, __u32 fds_len, |
413 | const __s32 fds[static 2], | |
414 | struct lxc_cmd_rsp *rsp) | |
9c3eb8d5 | 415 | { |
ef6e048a CB |
416 | ssize_t ret; |
417 | ||
418 | if (fds_len > KERNEL_SCM_MAX_FD) { | |
419 | rsp->ret = -E2BIG; | |
420 | return lxc_cmd_rsp_send_reap(fd, rsp); | |
421 | } else if (fds_len == 0) { | |
422 | rsp->ret = -ENOENT; | |
423 | return lxc_cmd_rsp_send_reap(fd, rsp); | |
424 | } | |
9c3eb8d5 | 425 | |
ef6e048a | 426 | ret = lxc_abstract_unix_send_fds(fd, fds, fds_len, rsp, sizeof(*rsp)); |
9c3eb8d5 CB |
427 | if (ret < 0) |
428 | return ret; | |
429 | ||
ef6e048a CB |
430 | if (rsp->data && rsp->datalen > 0) { |
431 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
432 | if (ret < 0 || ret != (ssize_t)rsp->datalen) | |
433 | return syswarn(-errno, "Failed to send command response %zd", ret); | |
434 | } | |
435 | ||
9c3eb8d5 CB |
436 | return LXC_CMD_REAP_CLIENT_FD; |
437 | } | |
438 | ||
c01c2be6 | 439 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 440 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 | 441 | { |
f62cf1d4 | 442 | __do_close int client_fd = -EBADF; |
fe84a562 | 443 | ssize_t ret = -1; |
c01c2be6 | 444 | |
9dfa4041 | 445 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
2a850b2c | 446 | if (client_fd < 0) |
fe84a562 | 447 | return -1; |
c01c2be6 | 448 | |
fe84a562 CB |
449 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
450 | sizeof(cmd->req)); | |
2a850b2c | 451 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) |
e96f9291 | 452 | return -1; |
9044b79e | 453 | |
cdb2a47f CB |
454 | if (cmd->req.cmd == LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER) { |
455 | int notify_fd = PTR_TO_INT(cmd->req.data); | |
456 | ret = lxc_abstract_unix_send_fds(client_fd, ¬ify_fd, 1, NULL, 0); | |
457 | if (ret <= 0) | |
458 | return -1; | |
459 | } else { | |
460 | if (cmd->req.datalen <= 0) | |
461 | return move_fd(client_fd); | |
c01c2be6 | 462 | |
cdb2a47f CB |
463 | errno = EMSGSIZE; |
464 | ret = lxc_send_nointr(client_fd, (void *)cmd->req.data, | |
465 | cmd->req.datalen, MSG_NOSIGNAL); | |
466 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) | |
467 | return -1; | |
468 | } | |
c01c2be6 | 469 | |
240fecd0 | 470 | return move_fd(client_fd); |
c01c2be6 CB |
471 | } |
472 | ||
ef6e34ee DE |
473 | /* |
474 | * lxc_cmd: Connect to the specified running container, send it a command | |
475 | * request and collect the response | |
476 | * | |
477 | * @name : name of container to connect to | |
1e8cfdf6 | 478 | * @cmd : command with initialized request to send |
ef6e34ee DE |
479 | * @stopped : output indicator if the container was not running |
480 | * @lxcpath : the lxcpath in which the container is running | |
481 | * | |
482 | * Returns the size of the response message on success, < 0 on failure | |
483 | * | |
7e85a2c4 CB |
484 | * Note that there is a special case for LXC_CMD_GET_TTY_FD. For this command |
485 | * the fd cannot be closed because it is used as a placeholder to indicate that | |
486 | * a particular tty slot is in use. The fd is also used as a signal to the | |
487 | * container that when the caller dies or closes the fd, the container will | |
488 | * notice the fd on its side of the socket in its mainloop select and then free | |
489 | * the slot with lxc_cmd_fd_cleanup(). The socket fd will be returned in the | |
490 | * cmd response structure. | |
ef6e34ee | 491 | */ |
57fc2dd7 CB |
492 | static ssize_t lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, bool *stopped, |
493 | const char *lxcpath, const char *hashed_sock_name) | |
724e753c | 494 | { |
f62cf1d4 | 495 | __do_close int client_fd = -EBADF; |
dbc9832d | 496 | bool stay_connected = false; |
57fc2dd7 | 497 | ssize_t ret; |
dbc9832d | 498 | |
7e85a2c4 | 499 | if (cmd->req.cmd == LXC_CMD_GET_TTY_FD || |
54446942 | 500 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 501 | stay_connected = true; |
724e753c | 502 | |
0ecf64b5 SH |
503 | *stopped = 0; |
504 | ||
c01c2be6 CB |
505 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
506 | if (client_fd < 0) { | |
0437eac5 | 507 | if (IN_SET(errno, ECONNREFUSED, EPIPE)) |
ef6e34ee | 508 | *stopped = 1; |
3f903c04 | 509 | |
57fc2dd7 | 510 | return systrace(-errno, "Command \"%s\" failed to connect command socket", lxc_cmd_str(cmd->req.cmd)); |
724e753c MN |
511 | } |
512 | ||
c01c2be6 | 513 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
2a850b2c | 514 | if (ret < 0 && errno == ECONNRESET) |
6b7f85cb | 515 | *stopped = 1; |
6a93ae77 | 516 | |
ea2a070b CB |
517 | TRACE("Opened new command socket connection fd %d for command \"%s\"", |
518 | client_fd, lxc_cmd_str(cmd->req.cmd)); | |
519 | ||
c34ff119 | 520 | if (stay_connected && ret > 0) |
240fecd0 | 521 | cmd->rsp.ret = move_fd(client_fd); |
43eb6f29 | 522 | |
1362f2eb | 523 | return ret; |
724e753c MN |
524 | } |
525 | ||
b494d2dd SH |
526 | int lxc_try_cmd(const char *name, const char *lxcpath) |
527 | { | |
8a598112 | 528 | bool stopped = false; |
57fc2dd7 | 529 | ssize_t ret; |
38d14ebd CB |
530 | struct lxc_cmd_rr cmd; |
531 | ||
532 | lxc_cmd_init(&cmd, LXC_CMD_GET_INIT_PID); | |
b494d2dd | 533 | |
88556fd7 | 534 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
535 | if (stopped) |
536 | return 0; | |
537 | if (ret > 0 && cmd.rsp.ret < 0) { | |
538 | errno = cmd.rsp.ret; | |
539 | return -1; | |
540 | } | |
541 | if (ret > 0) | |
542 | return 0; | |
543 | ||
8a598112 CB |
544 | /* |
545 | * At this point we weren't denied access, and the container *was* | |
fe84a562 CB |
546 | * started. There was some inexplicable error in the protocol. I'm not |
547 | * clear on whether we should return -1 here, but we didn't receive a | |
548 | * -EACCES, so technically it's not that we're not allowed to control | |
549 | * the container - it's just not behaving. | |
b494d2dd SH |
550 | */ |
551 | return 0; | |
552 | } | |
553 | ||
e6bc68d6 WB |
554 | /* |
555 | * Validate that the input is a proper string parameter. If not, | |
556 | * send an EINVAL response and return -1. | |
557 | * | |
558 | * Precondition: there is non-zero-length data available. | |
559 | */ | |
560 | static int validate_string_request(int fd, const struct lxc_cmd_req *req) | |
561 | { | |
e6bc68d6 WB |
562 | size_t maxlen = req->datalen - 1; |
563 | const char *data = req->data; | |
564 | ||
565 | if (data[maxlen] == 0 && strnlen(data, maxlen) == maxlen) | |
566 | return 0; | |
567 | ||
568 | struct lxc_cmd_rsp rsp = { | |
da63ea6b CB |
569 | .ret = -EINVAL, |
570 | .datalen = 0, | |
571 | .data = NULL, | |
e6bc68d6 WB |
572 | }; |
573 | ||
4b5f4bdc | 574 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
e6bc68d6 WB |
575 | } |
576 | ||
cc4c0832 | 577 | /* Implementations of the commands and their callbacks */ |
ef6e34ee DE |
578 | |
579 | /* | |
580 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
581 | * | |
582 | * @name : name of container to connect to | |
583 | * @lxcpath : the lxcpath in which the container is running | |
584 | * | |
585 | * Returns the pid on success, < 0 on failure | |
586 | */ | |
587 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 588 | { |
8a598112 | 589 | bool stopped = false; |
57fc2dd7 | 590 | ssize_t ret; |
22642823 CB |
591 | pid_t pid; |
592 | struct lxc_cmd_rr cmd; | |
593 | ||
594 | lxc_cmd_init(&cmd, LXC_CMD_GET_INIT_PID); | |
ef6e34ee | 595 | |
88556fd7 | 596 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 597 | if (ret < 0) |
8ed8a626 | 598 | return -1; |
ef6e34ee | 599 | |
565eb353 | 600 | pid = PTR_TO_PID(cmd.rsp.data); |
9234406b CB |
601 | if (pid < 0) |
602 | return -1; | |
603 | ||
8a598112 CB |
604 | /* |
605 | * We need to assume that pid_t can actually hold any pid given to us | |
9234406b CB |
606 | * by the kernel. If it can't it's a libc bug. |
607 | */ | |
608 | return (pid_t)pid; | |
43eb6f29 DL |
609 | } |
610 | ||
ef6e34ee | 611 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
612 | struct lxc_handler *handler, |
613 | struct lxc_epoll_descr *descr) | |
43eb6f29 | 614 | { |
9234406b | 615 | struct lxc_cmd_rsp rsp = { |
4b5f4bdc | 616 | .data = PID_TO_PTR(handler->pid), |
9234406b | 617 | }; |
ef6e34ee | 618 | |
4b5f4bdc | 619 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
43eb6f29 DL |
620 | } |
621 | ||
746aab51 CB |
622 | int lxc_cmd_get_init_pidfd(const char *name, const char *lxcpath) |
623 | { | |
8a598112 | 624 | bool stopped = false; |
6d829cd2 CB |
625 | int fd; |
626 | ssize_t ret; | |
7208e700 CB |
627 | struct lxc_cmd_rr cmd; |
628 | ||
629 | lxc_cmd_init(&cmd, LXC_CMD_GET_INIT_PIDFD); | |
746aab51 CB |
630 | |
631 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
632 | if (ret < 0) | |
6d829cd2 CB |
633 | return sysdebug("Failed to process \"%s\"", |
634 | lxc_cmd_str(LXC_CMD_GET_INIT_PIDFD)); | |
746aab51 CB |
635 | |
636 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
637 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
638 | lxc_cmd_str(LXC_CMD_GET_INIT_PIDFD)); | |
746aab51 | 639 | |
6d829cd2 CB |
640 | fd = PTR_TO_INT(cmd.rsp.data); |
641 | if (fd < 0) | |
642 | return sysdebug_set(fd, "Received invalid file descriptor for \"%s\"", | |
643 | lxc_cmd_str(LXC_CMD_GET_INIT_PIDFD)); | |
8a95cd82 | 644 | |
6d829cd2 | 645 | return fd; |
746aab51 CB |
646 | } |
647 | ||
648 | static int lxc_cmd_get_init_pidfd_callback(int fd, struct lxc_cmd_req *req, | |
649 | struct lxc_handler *handler, | |
650 | struct lxc_epoll_descr *descr) | |
651 | { | |
652 | struct lxc_cmd_rsp rsp = { | |
89d51b22 | 653 | .ret = -EBADF, |
746aab51 | 654 | }; |
746aab51 CB |
655 | |
656 | if (handler->pidfd < 0) | |
4b5f4bdc CB |
657 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
658 | ||
659 | rsp.ret = 0; | |
46b576e5 | 660 | return rsp_one_fd_reap(fd, handler->pidfd, &rsp); |
746aab51 CB |
661 | } |
662 | ||
f797f05e CB |
663 | int lxc_cmd_get_devpts_fd(const char *name, const char *lxcpath) |
664 | { | |
8a598112 | 665 | bool stopped = false; |
6d829cd2 | 666 | int fd; |
57fc2dd7 | 667 | ssize_t ret; |
f7a7b095 CB |
668 | struct lxc_cmd_rr cmd; |
669 | ||
670 | lxc_cmd_init(&cmd, LXC_CMD_GET_DEVPTS_FD); | |
f797f05e CB |
671 | |
672 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
673 | if (ret < 0) | |
6d829cd2 CB |
674 | return sysdebug("Failed to process \"%s\"", |
675 | lxc_cmd_str(LXC_CMD_GET_DEVPTS_FD)); | |
f797f05e CB |
676 | |
677 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
678 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
679 | lxc_cmd_str(LXC_CMD_GET_DEVPTS_FD)); | |
f797f05e | 680 | |
6d829cd2 CB |
681 | fd = PTR_TO_INT(cmd.rsp.data); |
682 | if (fd < 0) | |
683 | return sysdebug_set(fd, "Received invalid file descriptor for \"%s\"", | |
684 | lxc_cmd_str(LXC_CMD_GET_DEVPTS_FD)); | |
685 | return fd; | |
f797f05e CB |
686 | } |
687 | ||
688 | static int lxc_cmd_get_devpts_fd_callback(int fd, struct lxc_cmd_req *req, | |
689 | struct lxc_handler *handler, | |
690 | struct lxc_epoll_descr *descr) | |
691 | { | |
692 | struct lxc_cmd_rsp rsp = { | |
6d829cd2 | 693 | .ret = -EBADF, |
f797f05e | 694 | }; |
f797f05e | 695 | |
6d829cd2 | 696 | if (handler->conf->devpts_fd < 0) |
4b5f4bdc CB |
697 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
698 | ||
699 | rsp.ret = 0; | |
46b576e5 | 700 | return rsp_one_fd_reap(fd, handler->conf->devpts_fd, &rsp); |
f797f05e CB |
701 | } |
702 | ||
21405769 CB |
703 | int lxc_cmd_get_seccomp_notify_fd(const char *name, const char *lxcpath) |
704 | { | |
a342b11f | 705 | #ifdef HAVE_SECCOMP_NOTIFY |
8a598112 | 706 | bool stopped = false; |
6d829cd2 | 707 | int fd; |
57fc2dd7 | 708 | ssize_t ret; |
f0af9082 CB |
709 | struct lxc_cmd_rr cmd; |
710 | ||
711 | lxc_cmd_init(&cmd, LXC_CMD_GET_SECCOMP_NOTIFY_FD); | |
21405769 CB |
712 | |
713 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
714 | if (ret < 0) | |
6d829cd2 CB |
715 | return sysdebug("Failed to process \"%s\"", |
716 | lxc_cmd_str(LXC_CMD_GET_SECCOMP_NOTIFY_FD)); | |
21405769 CB |
717 | |
718 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
719 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
720 | lxc_cmd_str(LXC_CMD_GET_SECCOMP_NOTIFY_FD)); | |
721 | ||
722 | fd = PTR_TO_INT(cmd.rsp.data); | |
723 | if (fd < 0) | |
724 | return sysdebug_set(fd, "Received invalid file descriptor for \"%s\"", | |
725 | lxc_cmd_str(LXC_CMD_GET_SECCOMP_NOTIFY_FD)); | |
726 | return fd; | |
21405769 | 727 | #else |
6d829cd2 | 728 | return ret_errno(ENOSYS); |
21405769 CB |
729 | #endif |
730 | } | |
731 | ||
732 | static int lxc_cmd_get_seccomp_notify_fd_callback(int fd, struct lxc_cmd_req *req, | |
733 | struct lxc_handler *handler, | |
734 | struct lxc_epoll_descr *descr) | |
735 | { | |
a342b11f | 736 | #ifdef HAVE_SECCOMP_NOTIFY |
21405769 | 737 | struct lxc_cmd_rsp rsp = { |
4b5f4bdc | 738 | .ret = -EBADF, |
21405769 | 739 | }; |
21405769 | 740 | |
6d829cd2 | 741 | if (handler->conf->seccomp.notifier.notify_fd < 0) |
4b5f4bdc CB |
742 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
743 | ||
744 | rsp.ret = 0; | |
46b576e5 | 745 | return rsp_one_fd_reap(fd, handler->conf->seccomp.notifier.notify_fd, &rsp); |
21405769 | 746 | #else |
060aaa39 | 747 | return syserror_set(-EOPNOTSUPP, "Seccomp notifier not supported"); |
21405769 CB |
748 | #endif |
749 | } | |
750 | ||
ef6e048a | 751 | int lxc_cmd_get_cgroup_ctx(const char *name, const char *lxcpath, |
ac5eacc6 | 752 | size_t size_ret_ctx, struct cgroup_ctx *ret_ctx) |
9c3eb8d5 | 753 | { |
8a598112 | 754 | bool stopped = false; |
57fc2dd7 | 755 | ssize_t ret; |
19d141f6 CB |
756 | struct lxc_cmd_rr cmd; |
757 | ||
758 | lxc_cmd_init(&cmd, LXC_CMD_GET_CGROUP_CTX); | |
759 | lxc_cmd_data(&cmd, size_ret_ctx, ret_ctx); | |
9c3eb8d5 | 760 | |
9c3eb8d5 CB |
761 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
762 | if (ret < 0) | |
6d829cd2 CB |
763 | return sysdebug("Failed to process \"%s\"", |
764 | lxc_cmd_str(LXC_CMD_GET_CGROUP_CTX)); | |
9c3eb8d5 CB |
765 | |
766 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
767 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
768 | lxc_cmd_str(LXC_CMD_GET_CGROUP_CTX)); | |
9c3eb8d5 CB |
769 | |
770 | return 0; | |
771 | } | |
772 | ||
ef6e048a CB |
773 | static int lxc_cmd_get_cgroup_ctx_callback(int fd, struct lxc_cmd_req *req, |
774 | struct lxc_handler *handler, | |
775 | struct lxc_epoll_descr *descr) | |
9c3eb8d5 | 776 | { |
f8cc4ae8 | 777 | struct lxc_cmd_rsp rsp = { |
6d829cd2 | 778 | .ret = EINVAL, |
f8cc4ae8 | 779 | }; |
9c3eb8d5 | 780 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ef6e048a | 781 | struct cgroup_ctx ctx_server = {}; |
57fc2dd7 | 782 | ssize_t ret; |
f8cc4ae8 | 783 | |
ef6e048a CB |
784 | ret = copy_struct_from_client(sizeof(struct cgroup_ctx), &ctx_server, |
785 | req->datalen, req->data); | |
f8cc4ae8 | 786 | if (ret < 0) |
ef6e048a CB |
787 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
788 | ||
789 | ret = prepare_cgroup_ctx(cgroup_ops, &ctx_server); | |
790 | if (ret < 0) { | |
791 | rsp.ret = ret; | |
792 | return lxc_cmd_rsp_send_reap(fd, &rsp); | |
793 | } | |
9c3eb8d5 | 794 | |
28c738eb | 795 | rsp.ret = 0; |
ef6e048a CB |
796 | rsp.data = &ctx_server; |
797 | rsp.datalen = min(sizeof(struct cgroup_ctx), (size_t)req->datalen); | |
46b576e5 | 798 | return rsp_many_fds_reap(fd, ctx_server.fd_len, ctx_server.fd, &rsp); |
9c3eb8d5 CB |
799 | } |
800 | ||
ef6e34ee DE |
801 | /* |
802 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
803 | * | |
804 | * @name : name of container to connect to | |
805 | * @lxcpath : the lxcpath in which the container is running | |
806 | * | |
807 | * Returns the clone flags on success, < 0 on failure | |
808 | */ | |
809 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
810 | { | |
8a598112 | 811 | bool stopped = false; |
57fc2dd7 | 812 | ssize_t ret; |
b4e1a2e8 CB |
813 | struct lxc_cmd_rr cmd; |
814 | ||
815 | lxc_cmd_init(&cmd, LXC_CMD_GET_CLONE_FLAGS); | |
ef6e34ee | 816 | |
88556fd7 | 817 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
818 | if (ret < 0) |
819 | return ret; | |
43eb6f29 | 820 | |
ef6e34ee DE |
821 | return PTR_TO_INT(cmd.rsp.data); |
822 | } | |
823 | ||
824 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
825 | struct lxc_handler *handler, |
826 | struct lxc_epoll_descr *descr) | |
26b2d152 | 827 | { |
6c6497ea CB |
828 | struct lxc_cmd_rsp rsp = { |
829 | .data = INT_TO_PTR(handler->ns_clone_flags), | |
830 | }; | |
ef6e34ee | 831 | |
4b5f4bdc | 832 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
ef6e34ee DE |
833 | } |
834 | ||
885bb002 CB |
835 | static char *lxc_cmd_get_cgroup_path_callback(const char *name, |
836 | const char *lxcpath, | |
837 | const char *controller, | |
838 | lxc_cmd_t command) | |
ef6e34ee | 839 | { |
8a598112 | 840 | bool stopped = false; |
57fc2dd7 | 841 | ssize_t ret; |
f85d2385 | 842 | struct lxc_cmd_rr cmd; |
26b2d152 | 843 | |
f85d2385 CB |
844 | lxc_cmd_init(&cmd, command); |
845 | if (controller) | |
846 | lxc_cmd_data(&cmd, strlen(controller) + 1, controller); | |
c2aed66d | 847 | |
88556fd7 | 848 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 849 | if (ret < 0) |
ef6e34ee DE |
850 | return NULL; |
851 | ||
400d579e | 852 | if (ret == 0) { |
a9b642ee | 853 | if (command == LXC_CMD_GET_LIMIT_CGROUP) { |
400d579e WB |
854 | /* |
855 | * This may indicate that the container was started | |
856 | * under an ealier version before | |
857 | * `cgroup_advanced_isolation` as implemented, there | |
858 | * it sees an unknown command and just closes the | |
859 | * socket, sending us an EOF. | |
860 | */ | |
885bb002 CB |
861 | return lxc_cmd_get_cgroup_path_callback(name, lxcpath, |
862 | controller, | |
863 | LXC_CMD_GET_CGROUP); | |
400d579e | 864 | } |
ef6e34ee | 865 | return NULL; |
400d579e | 866 | } |
ef6e34ee | 867 | |
fe84a562 | 868 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 869 | return NULL; |
3f903c04 | 870 | |
ef6e34ee DE |
871 | return cmd.rsp.data; |
872 | } | |
873 | ||
a900cbaf WB |
874 | /* |
875 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
f85d2385 | 876 | * particular controller. This is the cgroup path relative to the root |
a900cbaf WB |
877 | * of the cgroup filesystem. |
878 | * | |
879 | * @name : name of container to connect to | |
880 | * @lxcpath : the lxcpath in which the container is running | |
f85d2385 | 881 | * @controller : the controller being asked about |
a900cbaf WB |
882 | * |
883 | * Returns the path on success, NULL on failure. The caller must free() the | |
884 | * returned path. | |
885 | */ | |
886 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, | |
f85d2385 | 887 | const char *controller) |
a900cbaf | 888 | { |
885bb002 CB |
889 | return lxc_cmd_get_cgroup_path_callback(name, lxcpath, controller, |
890 | LXC_CMD_GET_CGROUP); | |
a900cbaf WB |
891 | } |
892 | ||
893 | /* | |
a9b642ee | 894 | * lxc_cmd_get_limit_cgroup_path: Calculate a container's limit cgroup |
f85d2385 | 895 | * path for a particular controller. This is the cgroup path relative to the |
a900cbaf | 896 | * root of the cgroup filesystem. This may be the same as the path returned by |
a9b642ee | 897 | * lxc_cmd_get_cgroup_path if the container doesn't have a limit path prefix |
a900cbaf WB |
898 | * set. |
899 | * | |
900 | * @name : name of container to connect to | |
901 | * @lxcpath : the lxcpath in which the container is running | |
f85d2385 | 902 | * @controller : the controller being asked about |
a900cbaf WB |
903 | * |
904 | * Returns the path on success, NULL on failure. The caller must free() the | |
905 | * returned path. | |
906 | */ | |
a9b642ee | 907 | char *lxc_cmd_get_limit_cgroup_path(const char *name, const char *lxcpath, |
f85d2385 | 908 | const char *controller) |
a900cbaf | 909 | { |
885bb002 CB |
910 | return lxc_cmd_get_cgroup_path_callback(name, lxcpath, controller, |
911 | LXC_CMD_GET_LIMIT_CGROUP); | |
a900cbaf WB |
912 | } |
913 | ||
885bb002 CB |
914 | static int __lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, |
915 | struct lxc_handler *handler, | |
916 | struct lxc_epoll_descr *descr, | |
917 | bool limiting_cgroup) | |
ef6e34ee | 918 | { |
57fc2dd7 | 919 | ssize_t ret; |
4fb3cba5 | 920 | const char *path; |
a900cbaf | 921 | const void *reqdata; |
fe84a562 | 922 | struct lxc_cmd_rsp rsp; |
2202afc9 | 923 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
a900cbaf | 924 | const char *(*get_fn)(struct cgroup_ops *ops, const char *controller); |
b98f7d6e | 925 | |
e6bc68d6 WB |
926 | if (req->datalen > 0) { |
927 | ret = validate_string_request(fd, req); | |
928 | if (ret != 0) | |
929 | return ret; | |
a900cbaf | 930 | reqdata = req->data; |
e6bc68d6 | 931 | } else { |
a900cbaf | 932 | reqdata = NULL; |
e6bc68d6 | 933 | } |
a900cbaf | 934 | |
a9b642ee | 935 | get_fn = (limiting_cgroup ? cgroup_ops->get_limit_cgroup |
29d652a9 | 936 | : cgroup_ops->get_cgroup); |
a900cbaf WB |
937 | |
938 | path = get_fn(cgroup_ops, reqdata); | |
939 | ||
b98f7d6e SH |
940 | if (!path) |
941 | return -1; | |
fe84a562 | 942 | |
4f17323e | 943 | rsp.ret = 0; |
fe84a562 CB |
944 | rsp.datalen = strlen(path) + 1; |
945 | rsp.data = (char *)path; | |
ef6e34ee | 946 | |
4b5f4bdc | 947 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
ef6e34ee DE |
948 | } |
949 | ||
a900cbaf WB |
950 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, |
951 | struct lxc_handler *handler, | |
952 | struct lxc_epoll_descr *descr) | |
953 | { | |
885bb002 | 954 | return __lxc_cmd_get_cgroup_callback(fd, req, handler, descr, false); |
a900cbaf WB |
955 | } |
956 | ||
a9b642ee CB |
957 | static int lxc_cmd_get_limit_cgroup_callback(int fd, struct lxc_cmd_req *req, |
958 | struct lxc_handler *handler, | |
959 | struct lxc_epoll_descr *descr) | |
a900cbaf | 960 | { |
885bb002 | 961 | return __lxc_cmd_get_cgroup_callback(fd, req, handler, descr, true); |
a900cbaf WB |
962 | } |
963 | ||
ef6e34ee DE |
964 | /* |
965 | * lxc_cmd_get_config_item: Get config item the running container | |
966 | * | |
967 | * @name : name of container to connect to | |
7fa3f2e9 | 968 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
969 | * @lxcpath : the lxcpath in which the container is running |
970 | * | |
971 | * Returns the item on success, NULL on failure. The caller must free() the | |
972 | * returned item. | |
973 | */ | |
974 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
975 | const char *lxcpath) | |
976 | { | |
8a598112 | 977 | bool stopped = false; |
57fc2dd7 | 978 | ssize_t ret; |
187e46ab CB |
979 | struct lxc_cmd_rr cmd; |
980 | ||
981 | if (is_empty_string(item)) | |
982 | return NULL; | |
983 | ||
984 | lxc_cmd_init(&cmd, LXC_CMD_GET_CONFIG_ITEM); | |
985 | lxc_cmd_data(&cmd, strlen(item) + 1, item); | |
ef6e34ee | 986 | |
88556fd7 | 987 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
988 | if (ret < 0) |
989 | return NULL; | |
990 | ||
991 | if (cmd.rsp.ret == 0) | |
992 | return cmd.rsp.data; | |
fe84a562 | 993 | |
ef6e34ee DE |
994 | return NULL; |
995 | } | |
996 | ||
997 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
998 | struct lxc_handler *handler, |
999 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 1000 | { |
5265a60c | 1001 | __do_free char *cidata = NULL; |
ef6e34ee | 1002 | int cilen; |
30aec088 | 1003 | struct lxc_config_t *item; |
fe84a562 | 1004 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
1005 | |
1006 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 1007 | item = lxc_get_config(req->data); |
30aec088 CB |
1008 | if (!item) |
1009 | goto err1; | |
fe84a562 | 1010 | |
cccd2219 | 1011 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
1012 | if (cilen <= 0) |
1013 | goto err1; | |
1014 | ||
5265a60c | 1015 | cidata = must_realloc(NULL, cilen + 1); |
cccd2219 | 1016 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 1017 | goto err1; |
fe84a562 | 1018 | |
ef6e34ee DE |
1019 | cidata[cilen] = '\0'; |
1020 | rsp.data = cidata; | |
1021 | rsp.datalen = cilen + 1; | |
1022 | rsp.ret = 0; | |
1023 | goto out; | |
1024 | ||
1025 | err1: | |
1026 | rsp.ret = -1; | |
1027 | out: | |
4b5f4bdc | 1028 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
ef6e34ee DE |
1029 | } |
1030 | ||
1031 | /* | |
1032 | * lxc_cmd_get_state: Get current state of the container | |
1033 | * | |
1034 | * @name : name of container to connect to | |
1035 | * @lxcpath : the lxcpath in which the container is running | |
1036 | * | |
1037 | * Returns the state on success, < 0 on failure | |
1038 | */ | |
dbc9832d | 1039 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 1040 | { |
8a598112 | 1041 | bool stopped = false; |
57fc2dd7 | 1042 | ssize_t ret; |
1b08494e CB |
1043 | struct lxc_cmd_rr cmd; |
1044 | ||
1045 | lxc_cmd_init(&cmd, LXC_CMD_GET_STATE); | |
26b2d152 | 1046 | |
88556fd7 | 1047 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 1048 | if (ret < 0 && stopped) |
ef6e34ee DE |
1049 | return STOPPED; |
1050 | ||
1051 | if (ret < 0) | |
26b2d152 | 1052 | return -1; |
26b2d152 | 1053 | |
6c6497ea CB |
1054 | if (!ret) |
1055 | return log_warn(-1, "Container \"%s\" has stopped before sending its state", name); | |
fe84a562 | 1056 | |
6c6497ea CB |
1057 | return log_debug(PTR_TO_INT(cmd.rsp.data), |
1058 | "Container \"%s\" is in \"%s\" state", name, | |
1059 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); | |
ef6e34ee DE |
1060 | } |
1061 | ||
1062 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1063 | struct lxc_handler *handler, |
1064 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 1065 | { |
6c6497ea CB |
1066 | struct lxc_cmd_rsp rsp = { |
1067 | .data = INT_TO_PTR(handler->state), | |
1068 | }; | |
ef6e34ee | 1069 | |
4b5f4bdc | 1070 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
ef6e34ee DE |
1071 | } |
1072 | ||
1073 | /* | |
1074 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
1075 | * the processes running inside this container will be killed. | |
1076 | * | |
1077 | * @name : name of container to connect to | |
1078 | * @lxcpath : the lxcpath in which the container is running | |
1079 | * | |
1080 | * Returns 0 on success, < 0 on failure | |
1081 | */ | |
1082 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
1083 | { | |
8a598112 | 1084 | bool stopped = false; |
57fc2dd7 | 1085 | ssize_t ret; |
dbdd56c1 CB |
1086 | struct lxc_cmd_rr cmd; |
1087 | ||
1088 | lxc_cmd_init(&cmd, LXC_CMD_STOP); | |
ef6e34ee | 1089 | |
88556fd7 | 1090 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 1091 | if (ret < 0) { |
6c6497ea CB |
1092 | if (stopped) |
1093 | return log_info(0, "Container \"%s\" is already stopped", name); | |
fe84a562 | 1094 | |
26b2d152 MN |
1095 | return -1; |
1096 | } | |
1097 | ||
fe84a562 CB |
1098 | /* We do not expect any answer, because we wait for the connection to be |
1099 | * closed. | |
95d5b147 | 1100 | */ |
6c6497ea CB |
1101 | if (ret > 0) |
1102 | return log_error_errno(-1, -cmd.rsp.ret, "Failed to stop container \"%s\"", name); | |
26b2d152 | 1103 | |
6c6497ea | 1104 | return log_info(0, "Container \"%s\" has stopped", name); |
26b2d152 MN |
1105 | } |
1106 | ||
ef6e34ee | 1107 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1108 | struct lxc_handler *handler, |
1109 | struct lxc_epoll_descr *descr) | |
d5088cf2 | 1110 | { |
ef6e34ee | 1111 | struct lxc_cmd_rsp rsp; |
ef6e34ee | 1112 | int stopsignal = SIGKILL; |
2202afc9 | 1113 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ea2a070b | 1114 | int ret; |
ef6e34ee DE |
1115 | |
1116 | if (handler->conf->stopsignal) | |
1117 | stopsignal = handler->conf->stopsignal; | |
1118 | memset(&rsp, 0, sizeof(rsp)); | |
9837ee46 | 1119 | |
8ad4fa68 | 1120 | if (handler->pidfd >= 0) |
9837ee46 CB |
1121 | rsp.ret = lxc_raw_pidfd_send_signal(handler->pidfd, stopsignal, NULL, 0); |
1122 | else | |
1123 | rsp.ret = kill(handler->pid, stopsignal); | |
ef6e34ee | 1124 | if (!rsp.ret) { |
9837ee46 CB |
1125 | if (handler->pidfd >= 0) |
1126 | TRACE("Sent signal %d to pidfd %d", stopsignal, handler->pidfd); | |
1127 | else | |
1128 | TRACE("Sent signal %d to pidfd %d", stopsignal, handler->pid); | |
1129 | ||
9d47970b | 1130 | if (pure_unified_layout(cgroup_ops)) |
c0af7b1c | 1131 | ret = __cgroup_unfreeze(cgroup_ops->unified->dfd_lim, -1); |
9d47970b CB |
1132 | else |
1133 | ret = cgroup_ops->unfreeze(cgroup_ops, -1); | |
8db8adea CB |
1134 | if (ret) |
1135 | WARN("Failed to unfreeze container \"%s\"", handler->name); | |
fe84a562 | 1136 | |
8db8adea | 1137 | return 0; |
018051e3 CB |
1138 | } else { |
1139 | rsp.ret = -errno; | |
ef6e34ee DE |
1140 | } |
1141 | ||
4b5f4bdc | 1142 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
ef6e34ee | 1143 | } |
d5088cf2 | 1144 | |
b5159817 | 1145 | /* |
2bd158cc | 1146 | * lxc_cmd_terminal_winch: noop |
b5159817 DE |
1147 | * |
1148 | * @name : name of container to connect to | |
1149 | * @lxcpath : the lxcpath in which the container is running | |
1150 | * | |
1151 | * Returns 0 on success, < 0 on failure | |
1152 | */ | |
8ccbbf94 | 1153 | int lxc_cmd_terminal_winch(const char *name, const char *lxcpath) |
b5159817 | 1154 | { |
b5159817 DE |
1155 | return 0; |
1156 | } | |
1157 | ||
8ccbbf94 | 1158 | static int lxc_cmd_terminal_winch_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1159 | struct lxc_handler *handler, |
1160 | struct lxc_epoll_descr *descr) | |
b5159817 | 1161 | { |
2bd158cc | 1162 | /* should never be called */ |
6d829cd2 | 1163 | return syserror_set(-ENOSYS, "Called lxc_cmd_terminal_winch_callback()"); |
b5159817 DE |
1164 | } |
1165 | ||
ef6e34ee | 1166 | /* |
7e85a2c4 | 1167 | * lxc_cmd_get_tty_fd: Open an fd to a tty in the container |
ef6e34ee DE |
1168 | * |
1169 | * @name : name of container to connect to | |
1170 | * @ttynum : in: the tty to open or -1 for next available | |
1171 | * : out: the tty allocated | |
36a94ce8 | 1172 | * @fd : out: file descriptor for ptx side of pty |
ef6e34ee DE |
1173 | * @lxcpath : the lxcpath in which the container is running |
1174 | * | |
0115f8fd | 1175 | * Returns fd holding tty allocated on success, < 0 on failure |
ef6e34ee | 1176 | */ |
7e85a2c4 | 1177 | int lxc_cmd_get_tty_fd(const char *name, int *ttynum, int *fd, const char *lxcpath) |
ef6e34ee | 1178 | { |
7e85a2c4 | 1179 | __do_free struct lxc_cmd_tty_rsp_data *rspdata = NULL; |
8a598112 | 1180 | bool stopped = false; |
57fc2dd7 | 1181 | ssize_t ret; |
1a37ba9d CB |
1182 | struct lxc_cmd_rr cmd; |
1183 | ||
1184 | lxc_cmd_init(&cmd, LXC_CMD_GET_TTY_FD); | |
1185 | lxc_cmd_data(&cmd, ENCODE_INTO_PTR_LEN, INT_TO_PTR(*ttynum)); | |
d5088cf2 | 1186 | |
88556fd7 | 1187 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 1188 | if (ret < 0) |
6d829cd2 CB |
1189 | return sysdebug("Failed to process \"%s\"", |
1190 | lxc_cmd_str(LXC_CMD_GET_TTY_FD)); | |
0115f8fd | 1191 | |
8259d86d | 1192 | rspdata = cmd.rsp.data; |
6c6497ea CB |
1193 | if (cmd.rsp.ret < 0) |
1194 | return log_error_errno(-1, -cmd.rsp.ret, "Denied access to tty"); | |
d5088cf2 | 1195 | |
6c6497ea CB |
1196 | if (ret == 0) |
1197 | return log_error(-1, "tty number %d invalid, busy or all ttys busy", *ttynum); | |
ef6e34ee | 1198 | |
36a94ce8 | 1199 | if (rspdata->ptxfd < 0) |
6c6497ea | 1200 | return log_error(-1, "Unable to allocate fd for tty %d", rspdata->ttynum); |
ef6e34ee | 1201 | |
6d829cd2 CB |
1202 | ret = cmd.rsp.ret; /* socket fd */ |
1203 | *fd = rspdata->ptxfd; | |
ef6e34ee | 1204 | *ttynum = rspdata->ttynum; |
fe84a562 | 1205 | |
6d829cd2 CB |
1206 | INFO("Alloced fd %d for tty %d via socket %zd", *fd, rspdata->ttynum, ret); |
1207 | return ret; | |
ef6e34ee DE |
1208 | } |
1209 | ||
7e85a2c4 CB |
1210 | static int lxc_cmd_get_tty_fd_callback(int fd, struct lxc_cmd_req *req, |
1211 | struct lxc_handler *handler, | |
1212 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 1213 | { |
4b5f4bdc | 1214 | struct lxc_cmd_rsp rsp = { |
d2560c4e | 1215 | .ret = -EBADF, |
4b5f4bdc | 1216 | }; |
d2560c4e | 1217 | int ptxfd, ret, ttynum; |
ef6e34ee | 1218 | |
d2560c4e | 1219 | ttynum = PTR_TO_INT(req->data); |
36a94ce8 CB |
1220 | ptxfd = lxc_terminal_allocate(handler->conf, fd, &ttynum); |
1221 | if (ptxfd < 0) | |
4b5f4bdc | 1222 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
ef6e34ee | 1223 | |
4b5f4bdc | 1224 | rsp.ret = 0; |
ef6e34ee | 1225 | rsp.data = INT_TO_PTR(ttynum); |
d2560c4e | 1226 | ret = rsp_one_fd_keep(fd, ptxfd, &rsp); |
fe84a562 | 1227 | if (ret < 0) { |
3dfe6f8d | 1228 | lxc_terminal_free(handler->conf, fd); |
4b5f4bdc | 1229 | return ret; |
ef6e34ee DE |
1230 | } |
1231 | ||
6d829cd2 CB |
1232 | DEBUG("Send tty to client"); |
1233 | return ret; | |
d5088cf2 CS |
1234 | } |
1235 | ||
88556fd7 ÇO |
1236 | /* |
1237 | * lxc_cmd_get_name: Returns the name of the container | |
1238 | * | |
1239 | * @hashed_sock_name: hashed socket name | |
1240 | * | |
1241 | * Returns the name on success, NULL on failure. | |
1242 | */ | |
1243 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
1244 | { | |
8a598112 | 1245 | bool stopped = false; |
57fc2dd7 | 1246 | ssize_t ret; |
16fcb1fe CB |
1247 | struct lxc_cmd_rr cmd; |
1248 | ||
1249 | lxc_cmd_init(&cmd, LXC_CMD_GET_NAME); | |
88556fd7 ÇO |
1250 | |
1251 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 1252 | if (ret < 0) |
88556fd7 | 1253 | return NULL; |
88556fd7 ÇO |
1254 | |
1255 | if (cmd.rsp.ret == 0) | |
1256 | return cmd.rsp.data; | |
fe84a562 | 1257 | |
88556fd7 ÇO |
1258 | return NULL; |
1259 | } | |
1260 | ||
1261 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1262 | struct lxc_handler *handler, |
1263 | struct lxc_epoll_descr *descr) | |
88556fd7 ÇO |
1264 | { |
1265 | struct lxc_cmd_rsp rsp; | |
1266 | ||
1267 | memset(&rsp, 0, sizeof(rsp)); | |
1268 | ||
f0ecc19d | 1269 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
1270 | rsp.datalen = strlen(handler->name) + 1; |
1271 | rsp.ret = 0; | |
1272 | ||
4b5f4bdc | 1273 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
88556fd7 ÇO |
1274 | } |
1275 | ||
1276 | /* | |
1277 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
1278 | * | |
1279 | * @hashed_sock_name: hashed socket name | |
1280 | * | |
1281 | * Returns the lxcpath on success, NULL on failure. | |
1282 | */ | |
1283 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
1284 | { | |
8a598112 | 1285 | bool stopped = false; |
57fc2dd7 | 1286 | ssize_t ret; |
9dca7207 CB |
1287 | struct lxc_cmd_rr cmd; |
1288 | ||
1289 | lxc_cmd_init(&cmd, LXC_CMD_GET_LXCPATH); | |
724e753c | 1290 | |
88556fd7 | 1291 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 1292 | if (ret < 0) |
88556fd7 | 1293 | return NULL; |
88556fd7 ÇO |
1294 | |
1295 | if (cmd.rsp.ret == 0) | |
1296 | return cmd.rsp.data; | |
fe84a562 | 1297 | |
88556fd7 ÇO |
1298 | return NULL; |
1299 | } | |
1300 | ||
1301 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1302 | struct lxc_handler *handler, |
1303 | struct lxc_epoll_descr *descr) | |
88556fd7 | 1304 | { |
6c6497ea CB |
1305 | struct lxc_cmd_rsp rsp = { |
1306 | .ret = 0, | |
1307 | .data = (char *)handler->lxcpath, | |
1308 | .datalen = strlen(handler->lxcpath) + 1, | |
1309 | }; | |
88556fd7 | 1310 | |
4b5f4bdc | 1311 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
88556fd7 | 1312 | } |
ef6e34ee | 1313 | |
54446942 | 1314 | int lxc_cmd_add_state_client(const char *name, const char *lxcpath, |
3d971319 | 1315 | lxc_state_t states[static MAX_STATE], |
92e35018 | 1316 | int *state_client_fd) |
dbc9832d | 1317 | { |
f62cf1d4 | 1318 | __do_close int clientfd = -EBADF; |
8a598112 | 1319 | bool stopped = false; |
8a598112 CB |
1320 | int state; |
1321 | ssize_t ret; | |
3de3c9e3 CB |
1322 | struct lxc_cmd_rr cmd; |
1323 | ||
1324 | lxc_cmd_init(&cmd, LXC_CMD_ADD_STATE_CLIENT); | |
1325 | lxc_cmd_data(&cmd, (sizeof(lxc_state_t) * MAX_STATE), states); | |
dbc9832d | 1326 | |
dbc9832d | 1327 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
1328 | if (states[STOPPED] != 0 && stopped != 0) |
1329 | return STOPPED; | |
1330 | ||
dbc9832d | 1331 | if (ret < 0) { |
f577e061 | 1332 | if (errno != ECONNREFUSED) |
6d1400b5 | 1333 | SYSERROR("Failed to execute command"); |
1334 | ||
dbc9832d CB |
1335 | return -1; |
1336 | } | |
fe84a562 | 1337 | |
dbc9832d CB |
1338 | /* We should now be guaranteed to get an answer from the state sending |
1339 | * function. | |
1340 | */ | |
cd889e57 | 1341 | clientfd = cmd.rsp.ret; |
6c6497ea CB |
1342 | if (clientfd < 0) |
1343 | return log_error_errno(-1, -clientfd, "Failed to receive socket fd"); | |
dbc9832d | 1344 | |
bc631984 | 1345 | state = PTR_TO_INT(cmd.rsp.data); |
6c6497ea CB |
1346 | if (state < MAX_STATE) |
1347 | return log_trace(state, "Container is already in requested state %s", lxc_state2str(state)); | |
bc631984 | 1348 | |
240fecd0 | 1349 | *state_client_fd = move_fd(clientfd); |
ea2a070b CB |
1350 | TRACE("State connection fd %d ready to listen for container state changes", *state_client_fd); |
1351 | return MAX_STATE; | |
dbc9832d CB |
1352 | } |
1353 | ||
ebbca852 | 1354 | static int lxc_cmd_add_state_client_callback(__owns int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1355 | struct lxc_handler *handler, |
1356 | struct lxc_epoll_descr *descr) | |
dbc9832d | 1357 | { |
4b5f4bdc CB |
1358 | struct lxc_cmd_rsp rsp = { |
1359 | .ret = -EINVAL, | |
1360 | }; | |
dbc9832d | 1361 | |
fe84a562 | 1362 | if (req->datalen < 0) |
254a22e1 | 1363 | goto reap_fd; |
dbc9832d | 1364 | |
71fc9c04 | 1365 | if (req->datalen != (sizeof(lxc_state_t) * MAX_STATE)) |
254a22e1 | 1366 | goto reap_fd; |
dbc9832d | 1367 | |
fe84a562 | 1368 | if (!req->data) |
254a22e1 | 1369 | goto reap_fd; |
dbc9832d | 1370 | |
c01c2be6 | 1371 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 | 1372 | if (rsp.ret < 0) |
254a22e1 | 1373 | goto reap_fd; |
44552fb2 | 1374 | |
bc631984 | 1375 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 1376 | |
254a22e1 CB |
1377 | return lxc_cmd_rsp_send_keep(fd, &rsp); |
1378 | ||
1379 | reap_fd: | |
4b5f4bdc | 1380 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
dbc9832d CB |
1381 | } |
1382 | ||
2a63b5cb CB |
1383 | int lxc_cmd_add_bpf_device_cgroup(const char *name, const char *lxcpath, |
1384 | struct device_item *device) | |
1385 | { | |
8a598112 | 1386 | bool stopped = false; |
57fc2dd7 | 1387 | ssize_t ret; |
9338a6f3 | 1388 | struct lxc_cmd_rr cmd; |
2a63b5cb CB |
1389 | |
1390 | if (strlen(device->access) > STRLITERALLEN("rwm")) | |
060aaa39 | 1391 | return syserror_set(-EINVAL, "Invalid access mode specified %s", device->access); |
9338a6f3 CB |
1392 | |
1393 | lxc_cmd_init(&cmd, LXC_CMD_ADD_BPF_DEVICE_CGROUP); | |
1394 | lxc_cmd_data(&cmd, sizeof(struct device_item), device); | |
2a63b5cb CB |
1395 | |
1396 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
9338a6f3 | 1397 | if (ret < 0) |
060aaa39 | 1398 | return syserror_set(ret, "Failed to process new bpf device cgroup command"); |
9338a6f3 CB |
1399 | |
1400 | if (cmd.rsp.ret < 0) | |
060aaa39 | 1401 | return syserror_set(cmd.rsp.ret, "Failed to add new bpf device cgroup rule"); |
2a63b5cb CB |
1402 | |
1403 | return 0; | |
2a63b5cb CB |
1404 | } |
1405 | ||
1406 | static int lxc_cmd_add_bpf_device_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
1407 | struct lxc_handler *handler, | |
1408 | struct lxc_epoll_descr *descr) | |
1409 | { | |
4b5f4bdc CB |
1410 | struct lxc_cmd_rsp rsp = { |
1411 | .ret = -EINVAL, | |
1412 | }; | |
0a150695 | 1413 | struct lxc_conf *conf; |
2a63b5cb CB |
1414 | |
1415 | if (req->datalen <= 0) | |
4b5f4bdc | 1416 | goto out; |
2a63b5cb CB |
1417 | |
1418 | if (req->datalen != sizeof(struct device_item)) | |
4b5f4bdc | 1419 | goto out; |
2a63b5cb CB |
1420 | |
1421 | if (!req->data) | |
4b5f4bdc | 1422 | goto out; |
2a63b5cb | 1423 | |
0a150695 | 1424 | conf = handler->conf; |
a134099d CB |
1425 | if (!bpf_cgroup_devices_update(handler->cgroup_ops, |
1426 | &conf->bpf_devices, | |
1427 | (struct device_item *)req->data)) | |
0a150695 CB |
1428 | rsp.ret = -1; |
1429 | else | |
1430 | rsp.ret = 0; | |
2a63b5cb | 1431 | |
4b5f4bdc CB |
1432 | out: |
1433 | return lxc_cmd_rsp_send_reap(fd, &rsp); | |
2a63b5cb CB |
1434 | } |
1435 | ||
191d43cc CB |
1436 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
1437 | struct lxc_console_log *log) | |
1438 | { | |
8a598112 | 1439 | bool stopped = false; |
dda7dc08 CB |
1440 | struct lxc_cmd_console_log data = { |
1441 | .clear = log->clear, | |
1442 | .read = log->read, | |
1443 | .read_max = *log->read_max, | |
1444 | }; | |
57fc2dd7 | 1445 | ssize_t ret; |
191d43cc CB |
1446 | struct lxc_cmd_rr cmd; |
1447 | ||
dda7dc08 CB |
1448 | lxc_cmd_init(&cmd, LXC_CMD_CONSOLE_LOG); |
1449 | lxc_cmd_data(&cmd, sizeof(struct lxc_cmd_console_log), &data); | |
191d43cc CB |
1450 | |
1451 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1452 | if (ret < 0) | |
1453 | return ret; | |
1454 | ||
1455 | /* There is nothing to be read from the buffer. So clear any values we | |
1456 | * where passed to clearly indicate to the user that nothing went wrong. | |
1457 | */ | |
63b74cda | 1458 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
1459 | *log->read_max = 0; |
1460 | log->data = NULL; | |
1461 | } | |
1462 | ||
1463 | /* This is a proper error so don't touch any values we were passed. */ | |
1464 | if (cmd.rsp.ret < 0) | |
1465 | return cmd.rsp.ret; | |
1466 | ||
dda7dc08 CB |
1467 | *log->read_max = cmd.rsp.datalen; |
1468 | log->data = cmd.rsp.data; | |
191d43cc CB |
1469 | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1474 | struct lxc_handler *handler, |
1475 | struct lxc_epoll_descr *descr) | |
191d43cc CB |
1476 | { |
1477 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 1478 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc CB |
1479 | const struct lxc_cmd_console_log *log = req->data; |
1480 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; | |
1481 | ||
1482 | rsp.ret = -EFAULT; | |
1483 | rsp.datalen = 0; | |
1484 | rsp.data = NULL; | |
28f3b1cd | 1485 | if (buffer_size <= 0) |
191d43cc CB |
1486 | goto out; |
1487 | ||
5928191e CB |
1488 | if (log->read || log->write_logfile) |
1489 | rsp.datalen = lxc_ringbuf_used(buf); | |
1490 | ||
191d43cc CB |
1491 | if (log->read) |
1492 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
1493 | ||
1494 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
1495 | rsp.datalen = log->read_max; | |
1496 | ||
1497 | /* there's nothing to read */ | |
63b74cda | 1498 | rsp.ret = -ENODATA; |
191d43cc | 1499 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
1500 | goto out; |
1501 | ||
63b74cda | 1502 | rsp.ret = 0; |
23e0d9af | 1503 | if (log->clear) |
43366ca2 | 1504 | lxc_ringbuf_clear(buf); /* clear the ringbuffer */ |
23e0d9af | 1505 | else if (rsp.datalen > 0) |
191d43cc CB |
1506 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
1507 | ||
1508 | out: | |
4b5f4bdc | 1509 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
191d43cc CB |
1510 | } |
1511 | ||
974a8aba CB |
1512 | int lxc_cmd_serve_state_clients(const char *name, const char *lxcpath, |
1513 | lxc_state_t state) | |
1514 | { | |
8a598112 | 1515 | bool stopped = false; |
8a598112 | 1516 | ssize_t ret; |
c58b63fe CB |
1517 | struct lxc_cmd_rr cmd; |
1518 | ||
1519 | lxc_cmd_init(&cmd, LXC_CMD_SERVE_STATE_CLIENTS); | |
1520 | lxc_cmd_data(&cmd, ENCODE_INTO_PTR_LEN, INT_TO_PTR(state)); | |
974a8aba CB |
1521 | |
1522 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1523 | if (ret < 0) |
1524 | return log_error_errno(-1, errno, "Failed to serve state clients"); | |
974a8aba CB |
1525 | |
1526 | return 0; | |
1527 | } | |
1528 | ||
1529 | static int lxc_cmd_serve_state_clients_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1530 | struct lxc_handler *handler, |
1531 | struct lxc_epoll_descr *descr) | |
974a8aba CB |
1532 | { |
1533 | int ret; | |
1534 | lxc_state_t state = PTR_TO_INT(req->data); | |
1535 | struct lxc_cmd_rsp rsp = {0}; | |
1536 | ||
1537 | ret = lxc_serve_state_clients(handler->name, handler, state); | |
1538 | if (ret < 0) | |
4b5f4bdc | 1539 | return ret; |
974a8aba | 1540 | |
4b5f4bdc | 1541 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
974a8aba CB |
1542 | } |
1543 | ||
cdb2a47f CB |
1544 | int lxc_cmd_seccomp_notify_add_listener(const char *name, const char *lxcpath, |
1545 | int fd, | |
1546 | /* unused */ unsigned int command, | |
1547 | /* unused */ unsigned int flags) | |
1548 | { | |
1549 | ||
c3e3c21a | 1550 | #ifdef HAVE_SECCOMP_NOTIFY |
8a598112 | 1551 | bool stopped = false; |
57fc2dd7 | 1552 | ssize_t ret; |
6e662117 CB |
1553 | struct lxc_cmd_rr cmd; |
1554 | ||
1555 | lxc_cmd_init(&cmd, LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER); | |
1556 | lxc_cmd_data(&cmd, ENCODE_INTO_PTR_LEN, INT_TO_PTR(fd)); | |
cdb2a47f CB |
1557 | |
1558 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1559 | if (ret < 0) |
1560 | return log_error_errno(-1, errno, "Failed to add seccomp listener"); | |
cdb2a47f CB |
1561 | |
1562 | return cmd.rsp.ret; | |
1563 | #else | |
3d0327ed | 1564 | return ret_set_errno(-1, ENOSYS); |
cdb2a47f CB |
1565 | #endif |
1566 | } | |
1567 | ||
1568 | static int lxc_cmd_seccomp_notify_add_listener_callback(int fd, | |
1569 | struct lxc_cmd_req *req, | |
1570 | struct lxc_handler *handler, | |
1571 | struct lxc_epoll_descr *descr) | |
1572 | { | |
1573 | struct lxc_cmd_rsp rsp = {0}; | |
cdb2a47f | 1574 | |
c3e3c21a CB |
1575 | #ifdef HAVE_SECCOMP_NOTIFY |
1576 | int ret; | |
f62cf1d4 | 1577 | __do_close int recv_fd = -EBADF; |
cdb2a47f | 1578 | |
d17c815d | 1579 | ret = lxc_abstract_unix_recv_one_fd(fd, &recv_fd, NULL, 0); |
c3e3c21a CB |
1580 | if (ret <= 0) { |
1581 | rsp.ret = -errno; | |
1582 | goto out; | |
cdb2a47f CB |
1583 | } |
1584 | ||
c3e3c21a CB |
1585 | if (!handler->conf->seccomp.notifier.wants_supervision || |
1586 | handler->conf->seccomp.notifier.proxy_fd < 0) { | |
1587 | SYSERROR("No seccomp proxy fd specified"); | |
1588 | rsp.ret = -EINVAL; | |
1589 | goto out; | |
1590 | } | |
cdb2a47f | 1591 | |
c3e3c21a | 1592 | ret = lxc_mainloop_add_handler(descr, recv_fd, seccomp_notify_handler, |
cdb2a47f | 1593 | handler); |
c3e3c21a CB |
1594 | if (ret < 0) { |
1595 | rsp.ret = -errno; | |
1596 | goto out; | |
1597 | } | |
68a9e3eb | 1598 | move_fd(recv_fd); |
cdb2a47f | 1599 | |
c3e3c21a | 1600 | out: |
cdb2a47f CB |
1601 | #else |
1602 | rsp.ret = -ENOSYS; | |
cdb2a47f | 1603 | |
c3e3c21a | 1604 | #endif |
4b5f4bdc | 1605 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
cdb2a47f CB |
1606 | } |
1607 | ||
018051e3 CB |
1608 | int lxc_cmd_freeze(const char *name, const char *lxcpath, int timeout) |
1609 | { | |
8a598112 | 1610 | bool stopped = false; |
57fc2dd7 | 1611 | ssize_t ret; |
ac91e515 CB |
1612 | struct lxc_cmd_rr cmd; |
1613 | ||
1614 | lxc_cmd_init(&cmd, LXC_CMD_FREEZE); | |
1615 | lxc_cmd_data(&cmd, ENCODE_INTO_PTR_LEN, INT_TO_PTR(timeout)); | |
018051e3 CB |
1616 | |
1617 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1618 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1619 | return log_error_errno(-1, errno, "Failed to freeze container"); |
018051e3 CB |
1620 | |
1621 | return cmd.rsp.ret; | |
1622 | } | |
1623 | ||
1624 | static int lxc_cmd_freeze_callback(int fd, struct lxc_cmd_req *req, | |
1625 | struct lxc_handler *handler, | |
1626 | struct lxc_epoll_descr *descr) | |
1627 | { | |
1628 | int timeout = PTR_TO_INT(req->data); | |
1629 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1630 | .ret = -ENOENT, |
018051e3 CB |
1631 | }; |
1632 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1633 | ||
1973b62a | 1634 | if (pure_unified_layout(ops)) |
018051e3 CB |
1635 | rsp.ret = ops->freeze(ops, timeout); |
1636 | ||
4b5f4bdc | 1637 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
018051e3 CB |
1638 | } |
1639 | ||
1640 | int lxc_cmd_unfreeze(const char *name, const char *lxcpath, int timeout) | |
1641 | { | |
8a598112 | 1642 | bool stopped = false; |
57fc2dd7 | 1643 | ssize_t ret; |
558cb2b5 | 1644 | struct lxc_cmd_rr cmd; |
018051e3 | 1645 | |
558cb2b5 CB |
1646 | lxc_cmd_init(&cmd, LXC_CMD_UNFREEZE); |
1647 | lxc_cmd_data(&cmd, ENCODE_INTO_PTR_LEN, INT_TO_PTR(timeout)); | |
1648 | ||
018051e3 CB |
1649 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
1650 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1651 | return log_error_errno(-1, errno, "Failed to unfreeze container"); |
018051e3 CB |
1652 | |
1653 | return cmd.rsp.ret; | |
1654 | } | |
1655 | ||
1656 | static int lxc_cmd_unfreeze_callback(int fd, struct lxc_cmd_req *req, | |
1657 | struct lxc_handler *handler, | |
1658 | struct lxc_epoll_descr *descr) | |
1659 | { | |
1660 | int timeout = PTR_TO_INT(req->data); | |
1661 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1662 | .ret = -ENOENT, |
018051e3 CB |
1663 | }; |
1664 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1665 | ||
1973b62a | 1666 | if (pure_unified_layout(ops)) |
018051e3 CB |
1667 | rsp.ret = ops->unfreeze(ops, timeout); |
1668 | ||
4b5f4bdc | 1669 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
018051e3 CB |
1670 | } |
1671 | ||
c206ac24 | 1672 | int lxc_cmd_get_cgroup_fd(const char *name, const char *lxcpath, |
abb6f657 | 1673 | size_t size_ret_fd, struct cgroup_fd *ret_fd) |
c206ac24 | 1674 | { |
8a598112 | 1675 | bool stopped = false; |
57fc2dd7 | 1676 | ssize_t ret; |
e83494bb CB |
1677 | struct lxc_cmd_rr cmd; |
1678 | ||
1679 | lxc_cmd_init(&cmd, LXC_CMD_GET_CGROUP_FD); | |
1680 | lxc_cmd_data(&cmd, sizeof(struct cgroup_fd), ret_fd); | |
c206ac24 CB |
1681 | |
1682 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1683 | if (ret < 0) | |
6d829cd2 CB |
1684 | return sysdebug("Failed to process \"%s\"", |
1685 | lxc_cmd_str(LXC_CMD_GET_CGROUP_FD)); | |
c206ac24 CB |
1686 | |
1687 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
1688 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
1689 | lxc_cmd_str(LXC_CMD_GET_CGROUP_FD)); | |
c206ac24 | 1690 | |
abb6f657 | 1691 | return 0; |
c206ac24 CB |
1692 | } |
1693 | ||
1694 | int lxc_cmd_get_limit_cgroup_fd(const char *name, const char *lxcpath, | |
abb6f657 | 1695 | size_t size_ret_fd, struct cgroup_fd *ret_fd) |
c206ac24 | 1696 | { |
8a598112 | 1697 | bool stopped = false; |
57fc2dd7 | 1698 | ssize_t ret; |
3d7661aa CB |
1699 | struct lxc_cmd_rr cmd; |
1700 | ||
1701 | lxc_cmd_init(&cmd, LXC_CMD_GET_LIMIT_CGROUP_FD); | |
1702 | lxc_cmd_data(&cmd, sizeof(struct cgroup_fd), ret_fd); | |
c206ac24 CB |
1703 | |
1704 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1705 | if (ret < 0) | |
6d829cd2 CB |
1706 | return sysdebug("Failed to process \"%s\"", |
1707 | lxc_cmd_str(LXC_CMD_GET_CGROUP_FD)); | |
c206ac24 CB |
1708 | |
1709 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
1710 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
1711 | lxc_cmd_str(LXC_CMD_GET_CGROUP_FD)); | |
c206ac24 | 1712 | |
abb6f657 | 1713 | return 0; |
c206ac24 CB |
1714 | } |
1715 | ||
1716 | static int __lxc_cmd_get_cgroup_fd_callback(int fd, struct lxc_cmd_req *req, | |
1717 | struct lxc_handler *handler, | |
1718 | struct lxc_epoll_descr *descr, | |
abb6f657 | 1719 | bool limit) |
c206ac24 CB |
1720 | { |
1721 | struct lxc_cmd_rsp rsp = { | |
1722 | .ret = -EINVAL, | |
1723 | }; | |
1724 | struct cgroup_ops *ops = handler->cgroup_ops; | |
abb6f657 CB |
1725 | struct cgroup_fd fd_server = {}; |
1726 | int ret; | |
c206ac24 | 1727 | |
abb6f657 CB |
1728 | ret = copy_struct_from_client(sizeof(struct cgroup_fd), &fd_server, |
1729 | req->datalen, req->data); | |
1730 | if (ret < 0) | |
c206ac24 CB |
1731 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
1732 | ||
abb6f657 CB |
1733 | if (strnlen(fd_server.controller, MAX_CGROUP_ROOT_NAMELEN) == 0) |
1734 | return lxc_cmd_rsp_send_reap(fd, &rsp); | |
c206ac24 | 1735 | |
abb6f657 CB |
1736 | ret = prepare_cgroup_fd(ops, &fd_server, limit); |
1737 | if (ret < 0) { | |
1738 | rsp.ret = ret; | |
c206ac24 CB |
1739 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
1740 | } | |
1741 | ||
6d829cd2 CB |
1742 | rsp.ret = 0; |
1743 | rsp.data = &fd_server; | |
1744 | rsp.datalen = min(sizeof(struct cgroup_fd), (size_t)req->datalen); | |
46b576e5 | 1745 | return rsp_one_fd_reap(fd, fd_server.fd, &rsp); |
c206ac24 CB |
1746 | } |
1747 | ||
1748 | static int lxc_cmd_get_cgroup_fd_callback(int fd, struct lxc_cmd_req *req, | |
1749 | struct lxc_handler *handler, | |
1750 | struct lxc_epoll_descr *descr) | |
1751 | { | |
1752 | return __lxc_cmd_get_cgroup_fd_callback(fd, req, handler, descr, false); | |
1753 | } | |
1754 | ||
1755 | static int lxc_cmd_get_limit_cgroup_fd_callback(int fd, struct lxc_cmd_req *req, | |
1756 | struct lxc_handler *handler, | |
1757 | struct lxc_epoll_descr *descr) | |
1758 | { | |
1759 | return __lxc_cmd_get_cgroup_fd_callback(fd, req, handler, descr, true); | |
1760 | } | |
1761 | ||
bad788b0 CB |
1762 | int lxc_cmd_get_cgroup2_fd(const char *name, const char *lxcpath) |
1763 | { | |
8a598112 | 1764 | bool stopped = false; |
6d829cd2 | 1765 | int fd; |
57fc2dd7 | 1766 | ssize_t ret; |
dab4f69f CB |
1767 | struct lxc_cmd_rr cmd; |
1768 | ||
1769 | lxc_cmd_init(&cmd, LXC_CMD_GET_CGROUP2_FD); | |
bad788b0 CB |
1770 | |
1771 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
23a917e5 | 1772 | if (ret < 0) |
6d829cd2 CB |
1773 | return sysdebug("Failed to process \"%s\"", |
1774 | lxc_cmd_str(LXC_CMD_GET_CGROUP2_FD)); | |
23a917e5 CB |
1775 | |
1776 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
1777 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
1778 | lxc_cmd_str(LXC_CMD_GET_CGROUP2_FD)); | |
6f7f2966 | 1779 | |
6d829cd2 CB |
1780 | fd = PTR_TO_INT(cmd.rsp.data); |
1781 | if (fd < 0) | |
1782 | return sysdebug_set(fd, "Received invalid file descriptor for \"%s\"", | |
1783 | lxc_cmd_str(LXC_CMD_GET_CGROUP2_FD)); | |
1784 | return fd; | |
6f7f2966 CB |
1785 | } |
1786 | ||
a9b642ee | 1787 | int lxc_cmd_get_limit_cgroup2_fd(const char *name, const char *lxcpath) |
6f7f2966 | 1788 | { |
8a598112 | 1789 | bool stopped = false; |
6d829cd2 | 1790 | int fd; |
57fc2dd7 | 1791 | ssize_t ret; |
962c70c5 CB |
1792 | struct lxc_cmd_rr cmd; |
1793 | ||
1794 | lxc_cmd_init(&cmd, LXC_CMD_GET_LIMIT_CGROUP2_FD); | |
6f7f2966 CB |
1795 | |
1796 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1797 | if (ret < 0) | |
6d829cd2 CB |
1798 | return sysdebug("Failed to process \"%s\"", |
1799 | lxc_cmd_str(LXC_CMD_GET_CGROUP2_FD)); | |
6f7f2966 CB |
1800 | |
1801 | if (cmd.rsp.ret < 0) | |
6d829cd2 CB |
1802 | return sysdebug_set(cmd.rsp.ret, "Failed to receive file descriptor for \"%s\"", |
1803 | lxc_cmd_str(LXC_CMD_GET_CGROUP2_FD)); | |
1804 | ||
1805 | fd = PTR_TO_INT(cmd.rsp.data); | |
1806 | if (fd < 0) | |
1807 | return sysdebug_set(fd, "Received invalid file descriptor for \"%s\"", | |
1808 | lxc_cmd_str(LXC_CMD_GET_CGROUP2_FD)); | |
1809 | return fd; | |
bad788b0 CB |
1810 | } |
1811 | ||
885bb002 CB |
1812 | static int __lxc_cmd_get_cgroup2_fd_callback(int fd, struct lxc_cmd_req *req, |
1813 | struct lxc_handler *handler, | |
1814 | struct lxc_epoll_descr *descr, | |
1815 | bool limiting_cgroup) | |
bad788b0 CB |
1816 | { |
1817 | struct lxc_cmd_rsp rsp = { | |
1818 | .ret = -EINVAL, | |
1819 | }; | |
1820 | struct cgroup_ops *ops = handler->cgroup_ops; | |
c2f40088 | 1821 | int send_fd; |
bad788b0 | 1822 | |
1973b62a | 1823 | if (!pure_unified_layout(ops) || !ops->unified) |
4b5f4bdc | 1824 | return lxc_cmd_rsp_send_reap(fd, &rsp); |
bad788b0 | 1825 | |
c0af7b1c | 1826 | send_fd = limiting_cgroup ? ops->unified->dfd_lim |
e33870e5 | 1827 | : ops->unified->dfd_con; |
a900cbaf | 1828 | |
4b5f4bdc CB |
1829 | if (send_fd < 0) { |
1830 | rsp.ret = -EBADF; | |
1831 | return lxc_cmd_rsp_send_reap(fd, &rsp); | |
1832 | } | |
1833 | ||
bad788b0 | 1834 | rsp.ret = 0; |
46b576e5 | 1835 | return rsp_one_fd_reap(fd, send_fd, &rsp); |
bad788b0 CB |
1836 | } |
1837 | ||
a900cbaf WB |
1838 | static int lxc_cmd_get_cgroup2_fd_callback(int fd, struct lxc_cmd_req *req, |
1839 | struct lxc_handler *handler, | |
1840 | struct lxc_epoll_descr *descr) | |
1841 | { | |
885bb002 | 1842 | return __lxc_cmd_get_cgroup2_fd_callback(fd, req, handler, descr, false); |
a900cbaf WB |
1843 | } |
1844 | ||
a9b642ee CB |
1845 | static int lxc_cmd_get_limit_cgroup2_fd_callback(int fd, struct lxc_cmd_req *req, |
1846 | struct lxc_handler *handler, | |
1847 | struct lxc_epoll_descr *descr) | |
a900cbaf | 1848 | { |
885bb002 | 1849 | return __lxc_cmd_get_cgroup2_fd_callback(fd, req, handler, descr, true); |
a900cbaf WB |
1850 | } |
1851 | ||
ebc548a1 CB |
1852 | static int lxc_cmd_rsp_send_enosys(int fd, int id) |
1853 | { | |
1854 | struct lxc_cmd_rsp rsp = { | |
1855 | .ret = -ENOSYS, | |
1856 | }; | |
1857 | ||
1858 | __lxc_cmd_rsp_send(fd, &rsp); | |
060aaa39 | 1859 | return syserror_set(-ENOSYS, "Invalid command id %d", id); |
ebc548a1 CB |
1860 | } |
1861 | ||
ef6e34ee | 1862 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1863 | struct lxc_handler *handler, |
1864 | struct lxc_epoll_descr *descr) | |
724e753c | 1865 | { |
cdb2a47f CB |
1866 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *, |
1867 | struct lxc_epoll_descr *); | |
ef6e34ee DE |
1868 | |
1869 | callback cb[LXC_CMD_MAX] = { | |
7e85a2c4 | 1870 | [LXC_CMD_GET_TTY_FD] = lxc_cmd_get_tty_fd_callback, |
2a63b5cb CB |
1871 | [LXC_CMD_TERMINAL_WINCH] = lxc_cmd_terminal_winch_callback, |
1872 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, | |
1873 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1874 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1875 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1876 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1877 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1878 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1879 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1880 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
1881 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, | |
1882 | [LXC_CMD_SERVE_STATE_CLIENTS] = lxc_cmd_serve_state_clients_callback, | |
1883 | [LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER] = lxc_cmd_seccomp_notify_add_listener_callback, | |
1884 | [LXC_CMD_ADD_BPF_DEVICE_CGROUP] = lxc_cmd_add_bpf_device_cgroup_callback, | |
018051e3 CB |
1885 | [LXC_CMD_FREEZE] = lxc_cmd_freeze_callback, |
1886 | [LXC_CMD_UNFREEZE] = lxc_cmd_unfreeze_callback, | |
bad788b0 | 1887 | [LXC_CMD_GET_CGROUP2_FD] = lxc_cmd_get_cgroup2_fd_callback, |
746aab51 | 1888 | [LXC_CMD_GET_INIT_PIDFD] = lxc_cmd_get_init_pidfd_callback, |
a9b642ee CB |
1889 | [LXC_CMD_GET_LIMIT_CGROUP] = lxc_cmd_get_limit_cgroup_callback, |
1890 | [LXC_CMD_GET_LIMIT_CGROUP2_FD] = lxc_cmd_get_limit_cgroup2_fd_callback, | |
f797f05e | 1891 | [LXC_CMD_GET_DEVPTS_FD] = lxc_cmd_get_devpts_fd_callback, |
21405769 | 1892 | [LXC_CMD_GET_SECCOMP_NOTIFY_FD] = lxc_cmd_get_seccomp_notify_fd_callback, |
ef6e048a | 1893 | [LXC_CMD_GET_CGROUP_CTX] = lxc_cmd_get_cgroup_ctx_callback, |
c206ac24 CB |
1894 | [LXC_CMD_GET_CGROUP_FD] = lxc_cmd_get_cgroup_fd_callback, |
1895 | [LXC_CMD_GET_LIMIT_CGROUP_FD] = lxc_cmd_get_limit_cgroup_fd_callback, | |
724e753c MN |
1896 | }; |
1897 | ||
23a917e5 | 1898 | if (req->cmd >= LXC_CMD_MAX) |
ebc548a1 | 1899 | return lxc_cmd_rsp_send_enosys(fd, req->cmd); |
23a917e5 | 1900 | |
cdb2a47f | 1901 | return cb[req->cmd](fd, req, handler, descr); |
724e753c MN |
1902 | } |
1903 | ||
ef6e34ee | 1904 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
cdb2a47f | 1905 | struct lxc_epoll_descr *descr, const lxc_cmd_t cmd) |
724e753c | 1906 | { |
3dfe6f8d | 1907 | lxc_terminal_free(handler->conf, fd); |
724e753c | 1908 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 | 1909 | |
cd5369b0 | 1910 | if (cmd == LXC_CMD_ADD_STATE_CLIENT) { |
ab92468c CB |
1911 | struct lxc_list *cur, *next; |
1912 | ||
cdb2a47f CB |
1913 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
1914 | struct lxc_state_client *client = cur->elem; | |
1915 | ||
1916 | if (client->clientfd != fd) | |
1917 | continue; | |
1918 | ||
ab92468c CB |
1919 | /* |
1920 | * Only kick client from list so it can't be found | |
1921 | * anymore. The actual close happens, as for all other | |
1922 | * file descriptors, below. | |
1923 | */ | |
cdb2a47f | 1924 | lxc_list_del(cur); |
cdb2a47f CB |
1925 | free(cur->elem); |
1926 | free(cur); | |
ab92468c | 1927 | |
39e2a438 CB |
1928 | /* |
1929 | * No need to walk the whole list. If we found the state | |
cdb2a47f CB |
1930 | * client fd there can't be a second one. |
1931 | */ | |
ea2a070b | 1932 | TRACE("Found state client fd %d in state client list for command \"%s\"", fd, lxc_cmd_str(cmd)); |
ab92468c | 1933 | break; |
cdb2a47f | 1934 | } |
39e2a438 CB |
1935 | |
1936 | /* | |
1937 | * We didn't add the state client to the list. Either because | |
1938 | * we failed to allocate memory (unlikely) or because the state | |
1939 | * was already reached by the time we were ready to add it. So | |
1940 | * fallthrough and clean it up. | |
1941 | */ | |
ea2a070b | 1942 | TRACE("Closing state client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
f6fc1565 | 1943 | } |
cd5369b0 | 1944 | |
ea2a070b | 1945 | TRACE("Closing client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
cd5369b0 | 1946 | close(fd); |
724e753c MN |
1947 | } |
1948 | ||
84c92abd DE |
1949 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1950 | struct lxc_epoll_descr *descr) | |
724e753c | 1951 | { |
5265a60c | 1952 | __do_free void *reqdata = NULL; |
724e753c | 1953 | int ret; |
ef6e34ee | 1954 | struct lxc_cmd_req req; |
724e753c MN |
1955 | struct lxc_handler *handler = data; |
1956 | ||
aae93dd3 | 1957 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
ded1d23f | 1958 | if (ret < 0) { |
ea2a070b | 1959 | SYSERROR("Failed to receive data on command socket for command \"%s\"", lxc_cmd_str(req.cmd)); |
9044b79e | 1960 | |
1961 | if (errno == EACCES) { | |
1962 | /* We don't care for the peer, just send and close. */ | |
ea2a070b | 1963 | struct lxc_cmd_rsp rsp = { |
f7a97743 | 1964 | .ret = -EPERM, |
ea2a070b | 1965 | }; |
9044b79e | 1966 | |
4b5f4bdc | 1967 | __lxc_cmd_rsp_send(fd, &rsp); |
9044b79e | 1968 | } |
1969 | ||
724e753c MN |
1970 | goto out_close; |
1971 | } | |
1972 | ||
fe84a562 | 1973 | if (ret == 0) |
724e753c | 1974 | goto out_close; |
724e753c | 1975 | |
ef6e34ee | 1976 | if (ret != sizeof(req)) { |
ea2a070b | 1977 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1978 | goto out_close; |
1979 | } | |
1980 | ||
ea2a070b CB |
1981 | if ((req.datalen > LXC_CMD_DATA_MAX) && (req.cmd != LXC_CMD_CONSOLE_LOG)) { |
1982 | ERROR("Received command data length %d is too large for command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); | |
724e753c MN |
1983 | goto out_close; |
1984 | } | |
1985 | ||
ef6e34ee | 1986 | if (req.datalen > 0) { |
5265a60c | 1987 | reqdata = must_realloc(NULL, req.datalen); |
e3233f26 | 1988 | ret = lxc_recv_nointr(fd, reqdata, req.datalen, 0); |
ef6e34ee | 1989 | if (ret != req.datalen) { |
ea2a070b | 1990 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1991 | goto out_close; |
1992 | } | |
fe84a562 | 1993 | |
ef6e34ee DE |
1994 | req.data = reqdata; |
1995 | } | |
1996 | ||
cdb2a47f | 1997 | ret = lxc_cmd_process(fd, &req, handler, descr); |
32fd8d4f CB |
1998 | if (ret < 0) { |
1999 | DEBUG("Failed to process command %s; cleaning up client fd %d", lxc_cmd_str(req.cmd), fd); | |
2000 | goto out_close; | |
2001 | } else if (ret == LXC_CMD_REAP_CLIENT_FD) { | |
2002 | TRACE("Processed command %s; cleaning up client fd %d", lxc_cmd_str(req.cmd), fd); | |
724e753c | 2003 | goto out_close; |
32fd8d4f CB |
2004 | } else { |
2005 | TRACE("Processed command %s; keeping client fd %d", lxc_cmd_str(req.cmd), fd); | |
724e753c MN |
2006 | } |
2007 | ||
2008 | out: | |
f7a97743 | 2009 | return LXC_MAINLOOP_CONTINUE; |
fe84a562 | 2010 | |
724e753c | 2011 | out_close: |
f6fc1565 | 2012 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
2013 | goto out; |
2014 | } | |
2015 | ||
84c92abd DE |
2016 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
2017 | struct lxc_epoll_descr *descr) | |
724e753c | 2018 | { |
f62cf1d4 | 2019 | __do_close int connection = -EBADF; |
fe84a562 | 2020 | int opt = 1, ret = -1; |
724e753c MN |
2021 | |
2022 | connection = accept(fd, NULL, 0); | |
6c6497ea CB |
2023 | if (connection < 0) |
2024 | return log_error_errno(LXC_MAINLOOP_ERROR, errno, "Failed to accept connection to run command"); | |
724e753c | 2025 | |
fe84a562 | 2026 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
2027 | if (ret < 0) |
2028 | return log_error_errno(ret, errno, "Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc | 2029 | |
fe84a562 | 2030 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
6c6497ea CB |
2031 | if (ret < 0) |
2032 | return log_error_errno(ret, errno, "Failed to enable necessary credentials on command socket"); | |
724e753c | 2033 | |
ef6e34ee | 2034 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
6c6497ea CB |
2035 | if (ret) |
2036 | return log_error(ret, "Failed to add command handler"); | |
724e753c | 2037 | |
ea2a070b | 2038 | TRACE("Accepted new client as fd %d on command server fd %d", connection, fd); |
240fecd0 | 2039 | move_fd(connection); |
724e753c | 2040 | return ret; |
724e753c MN |
2041 | } |
2042 | ||
6834acff | 2043 | int lxc_server_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 2044 | { |
f62cf1d4 | 2045 | __do_close int fd = -EBADF; |
c13e7111 | 2046 | int ret; |
b1234129 | 2047 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
724e753c | 2048 | |
5b46db1a | 2049 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, NULL, suffix); |
fe84a562 | 2050 | if (ret < 0) |
9ba8130c | 2051 | return -1; |
724e753c | 2052 | |
aae93dd3 | 2053 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 2054 | if (fd < 0) { |
08aa08fe | 2055 | if (errno == EADDRINUSE) |
fe84a562 | 2056 | ERROR("Container \"%s\" appears to be already running", name); |
6d1400b5 | 2057 | |
6c6497ea | 2058 | return log_error_errno(-1, errno, "Failed to create command socket %s", &path[1]); |
724e753c MN |
2059 | } |
2060 | ||
fe84a562 | 2061 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
2062 | if (ret < 0) |
2063 | return log_error_errno(-1, errno, "Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f | 2064 | |
6c6497ea | 2065 | return log_trace(move_fd(fd), "Created abstract unix socket \"%s\"", &path[1]); |
d2e30e99 DE |
2066 | } |
2067 | ||
fe84a562 | 2068 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 2069 | struct lxc_handler *handler) |
d2e30e99 | 2070 | { |
fe84a562 | 2071 | int ret; |
d2e30e99 | 2072 | |
ea2a070b | 2073 | ret = lxc_mainloop_add_handler(descr, handler->conf->maincmd_fd, lxc_cmd_accept, handler); |
6c6497ea | 2074 | if (ret < 0) |
ea2a070b | 2075 | return log_error(ret, "Failed to add handler for command socket fd %d", handler->conf->maincmd_fd); |
724e753c MN |
2076 | |
2077 | return ret; | |
2078 | } |