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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", |
ef6e34ee | 86 | }; |
724e753c | 87 | |
f371aca9 | 88 | if (cmd >= LXC_CMD_MAX) |
a8007512 | 89 | return "Invalid request"; |
fe84a562 | 90 | |
ef6e34ee DE |
91 | return cmdname[cmd]; |
92 | } | |
93 | ||
94 | /* | |
95 | * lxc_cmd_rsp_recv: Receive a response to a command | |
96 | * | |
97 | * @sock : the socket connected to the container | |
98 | * @cmd : command to put response in | |
99 | * | |
100 | * Returns the size of the response message or < 0 on failure | |
101 | * | |
102 | * Note that if the command response datalen > 0, then data is | |
103 | * a malloc()ed buffer and should be free()ed by the caller. If | |
104 | * the response data is <= a void * worth of data, it will be | |
105 | * stored directly in data and datalen will be 0. | |
106 | * | |
107 | * As a special case, the response for LXC_CMD_CONSOLE is created | |
0115f8fd DE |
108 | * here as it contains an fd for the master pty passed through the |
109 | * unix socket. | |
ef6e34ee DE |
110 | */ |
111 | static int lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) | |
112 | { | |
23a917e5 CB |
113 | __do_close_prot_errno int fd_rsp = -EBADF; |
114 | int ret; | |
ef6e34ee DE |
115 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
116 | ||
23a917e5 CB |
117 | ret = lxc_abstract_unix_recv_fds(sock, &fd_rsp, 1, rsp, sizeof(*rsp)); |
118 | if (ret < 0) | |
119 | return log_warn_errno(-1, | |
120 | errno, "Failed to receive response for command \"%s\"", | |
121 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 122 | TRACE("Command \"%s\" received response", lxc_cmd_str(cmd->req.cmd)); |
ef6e34ee DE |
123 | |
124 | if (cmd->req.cmd == LXC_CMD_CONSOLE) { | |
125 | struct lxc_cmd_console_rsp_data *rspdata; | |
126 | ||
0115f8fd DE |
127 | /* recv() returns 0 bytes when a tty cannot be allocated, |
128 | * rsp->ret is < 0 when the peer permission check failed | |
129 | */ | |
130 | if (ret == 0 || rsp->ret < 0) | |
131 | return 0; | |
132 | ||
ef6e34ee | 133 | rspdata = malloc(sizeof(*rspdata)); |
23a917e5 CB |
134 | if (!rspdata) |
135 | return log_warn_errno(-1, | |
136 | ENOMEM, "Failed to receive response for command \"%s\"", | |
137 | lxc_cmd_str(cmd->req.cmd)); | |
2a850b2c | 138 | |
23a917e5 | 139 | rspdata->masterfd = move_fd(fd_rsp); |
ef6e34ee DE |
140 | rspdata->ttynum = PTR_TO_INT(rsp->data); |
141 | rsp->data = rspdata; | |
142 | } | |
143 | ||
23a917e5 CB |
144 | if (cmd->req.cmd == LXC_CMD_GET_CGROUP2_FD) { |
145 | int cgroup2_fd = move_fd(fd_rsp); | |
146 | rsp->data = INT_TO_PTR(cgroup2_fd); | |
860e7c43 | 147 | } |
fe84a562 | 148 | |
23a917e5 CB |
149 | if (rsp->datalen == 0) |
150 | return log_debug(ret, | |
151 | "Response data length for command \"%s\" is 0", | |
152 | lxc_cmd_str(cmd->req.cmd)); | |
153 | ||
191d43cc | 154 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && |
23a917e5 CB |
155 | (cmd->req.cmd != LXC_CMD_CONSOLE_LOG)) |
156 | return log_error(-1, "Response data for command \"%s\" is too long: %d bytes > %d", | |
157 | lxc_cmd_str(cmd->req.cmd), rsp->datalen, | |
158 | LXC_CMD_DATA_MAX); | |
ef6e34ee | 159 | |
191d43cc CB |
160 | if (cmd->req.cmd == LXC_CMD_CONSOLE_LOG) { |
161 | rsp->data = malloc(rsp->datalen + 1); | |
162 | ((char *)rsp->data)[rsp->datalen] = '\0'; | |
163 | } else { | |
164 | rsp->data = malloc(rsp->datalen); | |
165 | } | |
23a917e5 CB |
166 | if (!rsp->data) |
167 | return log_error_errno(-1, | |
168 | ENOMEM, "Failed to allocate response buffer for command \"%s\"", | |
169 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 170 | |
2a850b2c | 171 | ret = lxc_recv_nointr(sock, rsp->data, rsp->datalen, 0); |
23a917e5 CB |
172 | if (ret != rsp->datalen) |
173 | return log_error_errno(-1, | |
174 | errno, "Failed to receive response data for command \"%s\"", | |
175 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
176 | |
177 | return ret; | |
178 | } | |
179 | ||
ef6e34ee DE |
180 | /* |
181 | * lxc_cmd_rsp_send: Send a command response | |
182 | * | |
183 | * @fd : file descriptor of socket to send response on | |
184 | * @rsp : response to send | |
185 | * | |
186 | * Returns 0 on success, < 0 on failure | |
187 | */ | |
188 | static int lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) | |
189 | { | |
fe84a562 | 190 | ssize_t ret; |
ef6e34ee | 191 | |
7fbb15ec CB |
192 | errno = EMSGSIZE; |
193 | ret = lxc_send_nointr(fd, rsp, sizeof(*rsp), MSG_NOSIGNAL); | |
6c6497ea CB |
194 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) |
195 | return log_error_errno(-1, errno, "Failed to send command response %zd", ret); | |
ef6e34ee | 196 | |
a674dfe1 | 197 | if (!rsp->data || rsp->datalen <= 0) |
fe84a562 CB |
198 | return 0; |
199 | ||
7fbb15ec CB |
200 | errno = EMSGSIZE; |
201 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
6c6497ea CB |
202 | if (ret < 0 || ret != (ssize_t)rsp->datalen) |
203 | return log_warn_errno(-1, errno, "Failed to send command response data %zd", ret); | |
fe84a562 | 204 | |
ef6e34ee DE |
205 | return 0; |
206 | } | |
207 | ||
c01c2be6 | 208 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 209 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 | 210 | { |
e96f9291 | 211 | __do_close_prot_errno int client_fd = -EBADF; |
fe84a562 | 212 | ssize_t ret = -1; |
c01c2be6 | 213 | |
9dfa4041 | 214 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
2a850b2c | 215 | if (client_fd < 0) |
fe84a562 | 216 | return -1; |
c01c2be6 | 217 | |
fe84a562 CB |
218 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
219 | sizeof(cmd->req)); | |
2a850b2c | 220 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) |
e96f9291 | 221 | return -1; |
9044b79e | 222 | |
cdb2a47f CB |
223 | if (cmd->req.cmd == LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER) { |
224 | int notify_fd = PTR_TO_INT(cmd->req.data); | |
225 | ret = lxc_abstract_unix_send_fds(client_fd, ¬ify_fd, 1, NULL, 0); | |
226 | if (ret <= 0) | |
227 | return -1; | |
228 | } else { | |
229 | if (cmd->req.datalen <= 0) | |
230 | return move_fd(client_fd); | |
c01c2be6 | 231 | |
cdb2a47f CB |
232 | errno = EMSGSIZE; |
233 | ret = lxc_send_nointr(client_fd, (void *)cmd->req.data, | |
234 | cmd->req.datalen, MSG_NOSIGNAL); | |
235 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) | |
236 | return -1; | |
237 | } | |
c01c2be6 | 238 | |
240fecd0 | 239 | return move_fd(client_fd); |
c01c2be6 CB |
240 | } |
241 | ||
ef6e34ee DE |
242 | /* |
243 | * lxc_cmd: Connect to the specified running container, send it a command | |
244 | * request and collect the response | |
245 | * | |
246 | * @name : name of container to connect to | |
1e8cfdf6 | 247 | * @cmd : command with initialized request to send |
ef6e34ee DE |
248 | * @stopped : output indicator if the container was not running |
249 | * @lxcpath : the lxcpath in which the container is running | |
250 | * | |
251 | * Returns the size of the response message on success, < 0 on failure | |
252 | * | |
253 | * Note that there is a special case for LXC_CMD_CONSOLE. For this command | |
254 | * the fd cannot be closed because it is used as a placeholder to indicate | |
255 | * that a particular tty slot is in use. The fd is also used as a signal to | |
256 | * the container that when the caller dies or closes the fd, the container | |
0115f8fd DE |
257 | * will notice the fd on its side of the socket in its mainloop select and |
258 | * then free the slot with lxc_cmd_fd_cleanup(). The socket fd will be | |
259 | * returned in the cmd response structure. | |
ef6e34ee DE |
260 | */ |
261 | static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped, | |
88556fd7 | 262 | const char *lxcpath, const char *hashed_sock_name) |
724e753c | 263 | { |
c34ff119 | 264 | __do_close_prot_errno int client_fd = -EBADF; |
fe84a562 | 265 | int ret = -1; |
dbc9832d CB |
266 | bool stay_connected = false; |
267 | ||
268 | if (cmd->req.cmd == LXC_CMD_CONSOLE || | |
54446942 | 269 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 270 | stay_connected = true; |
724e753c | 271 | |
0ecf64b5 SH |
272 | *stopped = 0; |
273 | ||
c01c2be6 CB |
274 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
275 | if (client_fd < 0) { | |
00e5ca13 | 276 | if (errno == ECONNREFUSED || errno == EPIPE) |
ef6e34ee | 277 | *stopped = 1; |
3f903c04 | 278 | |
6c6497ea CB |
279 | return log_trace_errno(-1, errno, "Command \"%s\" failed to connect command socket", |
280 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
281 | } |
282 | ||
c01c2be6 | 283 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
2a850b2c | 284 | if (ret < 0 && errno == ECONNRESET) |
6b7f85cb | 285 | *stopped = 1; |
6a93ae77 | 286 | |
c34ff119 | 287 | if (stay_connected && ret > 0) |
240fecd0 | 288 | cmd->rsp.ret = move_fd(client_fd); |
43eb6f29 | 289 | |
1362f2eb | 290 | return ret; |
724e753c MN |
291 | } |
292 | ||
b494d2dd SH |
293 | int lxc_try_cmd(const char *name, const char *lxcpath) |
294 | { | |
0ecf64b5 | 295 | int stopped, ret; |
b494d2dd SH |
296 | struct lxc_cmd_rr cmd = { |
297 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
298 | }; | |
299 | ||
88556fd7 | 300 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
301 | if (stopped) |
302 | return 0; | |
303 | if (ret > 0 && cmd.rsp.ret < 0) { | |
304 | errno = cmd.rsp.ret; | |
305 | return -1; | |
306 | } | |
307 | if (ret > 0) | |
308 | return 0; | |
309 | ||
fe84a562 CB |
310 | /* At this point we weren't denied access, and the container *was* |
311 | * started. There was some inexplicable error in the protocol. I'm not | |
312 | * clear on whether we should return -1 here, but we didn't receive a | |
313 | * -EACCES, so technically it's not that we're not allowed to control | |
314 | * the container - it's just not behaving. | |
b494d2dd SH |
315 | */ |
316 | return 0; | |
317 | } | |
318 | ||
cc4c0832 | 319 | /* Implementations of the commands and their callbacks */ |
ef6e34ee DE |
320 | |
321 | /* | |
322 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
323 | * | |
324 | * @name : name of container to connect to | |
325 | * @lxcpath : the lxcpath in which the container is running | |
326 | * | |
327 | * Returns the pid on success, < 0 on failure | |
328 | */ | |
329 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 330 | { |
0ecf64b5 | 331 | int ret, stopped; |
6c6497ea | 332 | intmax_t pid = -1; |
ef6e34ee | 333 | struct lxc_cmd_rr cmd = { |
e8cd1208 CB |
334 | .req = { |
335 | .cmd = LXC_CMD_GET_INIT_PID | |
336 | }, | |
337 | .rsp = { | |
6c6497ea | 338 | .data = INTMAX_TO_PTR(pid) |
e8cd1208 | 339 | } |
ef6e34ee DE |
340 | }; |
341 | ||
88556fd7 | 342 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 343 | if (ret < 0) |
8ed8a626 | 344 | return -1; |
ef6e34ee | 345 | |
9234406b CB |
346 | pid = PTR_TO_INTMAX(cmd.rsp.data); |
347 | if (pid < 0) | |
348 | return -1; | |
349 | ||
350 | /* We need to assume that pid_t can actually hold any pid given to us | |
351 | * by the kernel. If it can't it's a libc bug. | |
352 | */ | |
353 | return (pid_t)pid; | |
43eb6f29 DL |
354 | } |
355 | ||
ef6e34ee | 356 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
357 | struct lxc_handler *handler, |
358 | struct lxc_epoll_descr *descr) | |
43eb6f29 | 359 | { |
54dcfd81 CB |
360 | intmax_t pid = handler->pid; |
361 | ||
9234406b | 362 | struct lxc_cmd_rsp rsp = { |
54dcfd81 | 363 | .data = INTMAX_TO_PTR(pid) |
9234406b | 364 | }; |
ef6e34ee DE |
365 | |
366 | return lxc_cmd_rsp_send(fd, &rsp); | |
43eb6f29 DL |
367 | } |
368 | ||
ef6e34ee DE |
369 | /* |
370 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
371 | * | |
372 | * @name : name of container to connect to | |
373 | * @lxcpath : the lxcpath in which the container is running | |
374 | * | |
375 | * Returns the clone flags on success, < 0 on failure | |
376 | */ | |
377 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
378 | { | |
0ecf64b5 | 379 | int ret, stopped; |
ef6e34ee | 380 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
381 | .req = { |
382 | .cmd = LXC_CMD_GET_CLONE_FLAGS, | |
383 | }, | |
ef6e34ee DE |
384 | }; |
385 | ||
88556fd7 | 386 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
387 | if (ret < 0) |
388 | return ret; | |
43eb6f29 | 389 | |
ef6e34ee DE |
390 | return PTR_TO_INT(cmd.rsp.data); |
391 | } | |
392 | ||
393 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
394 | struct lxc_handler *handler, |
395 | struct lxc_epoll_descr *descr) | |
26b2d152 | 396 | { |
6c6497ea CB |
397 | struct lxc_cmd_rsp rsp = { |
398 | .data = INT_TO_PTR(handler->ns_clone_flags), | |
399 | }; | |
ef6e34ee DE |
400 | |
401 | return lxc_cmd_rsp_send(fd, &rsp); | |
402 | } | |
403 | ||
404 | /* | |
405 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
406 | * particular subsystem. This is the cgroup path relative to the root | |
407 | * of the cgroup filesystem. | |
408 | * | |
ef6e34ee DE |
409 | * @name : name of container to connect to |
410 | * @lxcpath : the lxcpath in which the container is running | |
b98f7d6e | 411 | * @subsystem : the subsystem being asked about |
ef6e34ee DE |
412 | * |
413 | * Returns the path on success, NULL on failure. The caller must free() the | |
414 | * returned path. | |
415 | */ | |
b98f7d6e | 416 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, |
fe84a562 | 417 | const char *subsystem) |
ef6e34ee | 418 | { |
0ecf64b5 | 419 | int ret, stopped; |
ef6e34ee | 420 | struct lxc_cmd_rr cmd = { |
b98f7d6e SH |
421 | .req = { |
422 | .cmd = LXC_CMD_GET_CGROUP, | |
b98f7d6e | 423 | .data = subsystem, |
c2aed66d | 424 | .datalen = 0, |
b98f7d6e | 425 | }, |
26b2d152 MN |
426 | }; |
427 | ||
c2aed66d CB |
428 | cmd.req.data = subsystem; |
429 | cmd.req.datalen = 0; | |
430 | if (subsystem) | |
431 | cmd.req.datalen = strlen(subsystem) + 1; | |
432 | ||
88556fd7 | 433 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 434 | if (ret < 0) |
ef6e34ee DE |
435 | return NULL; |
436 | ||
fe84a562 | 437 | if (ret == 0) |
ef6e34ee | 438 | return NULL; |
ef6e34ee | 439 | |
fe84a562 | 440 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 441 | return NULL; |
3f903c04 | 442 | |
ef6e34ee DE |
443 | return cmd.rsp.data; |
444 | } | |
445 | ||
446 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
447 | struct lxc_handler *handler, |
448 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 449 | { |
4fb3cba5 | 450 | const char *path; |
fe84a562 | 451 | struct lxc_cmd_rsp rsp; |
2202afc9 | 452 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
b98f7d6e | 453 | |
c2aed66d | 454 | if (req->datalen > 0) |
2202afc9 | 455 | path = cgroup_ops->get_cgroup(cgroup_ops, req->data); |
c2aed66d | 456 | else |
2202afc9 | 457 | path = cgroup_ops->get_cgroup(cgroup_ops, NULL); |
b98f7d6e SH |
458 | if (!path) |
459 | return -1; | |
fe84a562 | 460 | |
4f17323e | 461 | rsp.ret = 0; |
fe84a562 CB |
462 | rsp.datalen = strlen(path) + 1; |
463 | rsp.data = (char *)path; | |
ef6e34ee DE |
464 | |
465 | return lxc_cmd_rsp_send(fd, &rsp); | |
466 | } | |
467 | ||
468 | /* | |
469 | * lxc_cmd_get_config_item: Get config item the running container | |
470 | * | |
471 | * @name : name of container to connect to | |
7fa3f2e9 | 472 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
473 | * @lxcpath : the lxcpath in which the container is running |
474 | * | |
475 | * Returns the item on success, NULL on failure. The caller must free() the | |
476 | * returned item. | |
477 | */ | |
478 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
479 | const char *lxcpath) | |
480 | { | |
0ecf64b5 | 481 | int ret, stopped; |
ef6e34ee DE |
482 | struct lxc_cmd_rr cmd = { |
483 | .req = { .cmd = LXC_CMD_GET_CONFIG_ITEM, | |
484 | .data = item, | |
fe84a562 | 485 | .datalen = strlen(item) + 1, |
ef6e34ee DE |
486 | }, |
487 | }; | |
488 | ||
88556fd7 | 489 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
490 | if (ret < 0) |
491 | return NULL; | |
492 | ||
493 | if (cmd.rsp.ret == 0) | |
494 | return cmd.rsp.data; | |
fe84a562 | 495 | |
ef6e34ee DE |
496 | return NULL; |
497 | } | |
498 | ||
499 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
500 | struct lxc_handler *handler, |
501 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 502 | { |
5265a60c | 503 | __do_free char *cidata = NULL; |
ef6e34ee | 504 | int cilen; |
30aec088 | 505 | struct lxc_config_t *item; |
fe84a562 | 506 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
507 | |
508 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 509 | item = lxc_get_config(req->data); |
30aec088 CB |
510 | if (!item) |
511 | goto err1; | |
fe84a562 | 512 | |
cccd2219 | 513 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
514 | if (cilen <= 0) |
515 | goto err1; | |
516 | ||
5265a60c | 517 | cidata = must_realloc(NULL, cilen + 1); |
cccd2219 | 518 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 519 | goto err1; |
fe84a562 | 520 | |
ef6e34ee DE |
521 | cidata[cilen] = '\0'; |
522 | rsp.data = cidata; | |
523 | rsp.datalen = cilen + 1; | |
524 | rsp.ret = 0; | |
525 | goto out; | |
526 | ||
527 | err1: | |
528 | rsp.ret = -1; | |
529 | out: | |
530 | return lxc_cmd_rsp_send(fd, &rsp); | |
531 | } | |
532 | ||
533 | /* | |
534 | * lxc_cmd_get_state: Get current state of the container | |
535 | * | |
536 | * @name : name of container to connect to | |
537 | * @lxcpath : the lxcpath in which the container is running | |
538 | * | |
539 | * Returns the state on success, < 0 on failure | |
540 | */ | |
dbc9832d | 541 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 542 | { |
0ecf64b5 | 543 | int ret, stopped; |
ef6e34ee | 544 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
545 | .req = { |
546 | .cmd = LXC_CMD_GET_STATE, | |
547 | }, | |
ef6e34ee | 548 | }; |
26b2d152 | 549 | |
88556fd7 | 550 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 551 | if (ret < 0 && stopped) |
ef6e34ee DE |
552 | return STOPPED; |
553 | ||
554 | if (ret < 0) | |
26b2d152 | 555 | return -1; |
26b2d152 | 556 | |
6c6497ea CB |
557 | if (!ret) |
558 | return log_warn(-1, "Container \"%s\" has stopped before sending its state", name); | |
fe84a562 | 559 | |
6c6497ea CB |
560 | return log_debug(PTR_TO_INT(cmd.rsp.data), |
561 | "Container \"%s\" is in \"%s\" state", name, | |
562 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); | |
ef6e34ee DE |
563 | } |
564 | ||
565 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
566 | struct lxc_handler *handler, |
567 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 568 | { |
6c6497ea CB |
569 | struct lxc_cmd_rsp rsp = { |
570 | .data = INT_TO_PTR(handler->state), | |
571 | }; | |
ef6e34ee DE |
572 | |
573 | return lxc_cmd_rsp_send(fd, &rsp); | |
574 | } | |
575 | ||
576 | /* | |
577 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
578 | * the processes running inside this container will be killed. | |
579 | * | |
580 | * @name : name of container to connect to | |
581 | * @lxcpath : the lxcpath in which the container is running | |
582 | * | |
583 | * Returns 0 on success, < 0 on failure | |
584 | */ | |
585 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
586 | { | |
0ecf64b5 | 587 | int ret, stopped; |
ef6e34ee | 588 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
589 | .req = { |
590 | .cmd = LXC_CMD_STOP, | |
591 | }, | |
ef6e34ee DE |
592 | }; |
593 | ||
88556fd7 | 594 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 595 | if (ret < 0) { |
6c6497ea CB |
596 | if (stopped) |
597 | return log_info(0, "Container \"%s\" is already stopped", name); | |
fe84a562 | 598 | |
26b2d152 MN |
599 | return -1; |
600 | } | |
601 | ||
fe84a562 CB |
602 | /* We do not expect any answer, because we wait for the connection to be |
603 | * closed. | |
95d5b147 | 604 | */ |
6c6497ea CB |
605 | if (ret > 0) |
606 | return log_error_errno(-1, -cmd.rsp.ret, "Failed to stop container \"%s\"", name); | |
26b2d152 | 607 | |
6c6497ea | 608 | return log_info(0, "Container \"%s\" has stopped", name); |
26b2d152 MN |
609 | } |
610 | ||
ef6e34ee | 611 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
612 | struct lxc_handler *handler, |
613 | struct lxc_epoll_descr *descr) | |
d5088cf2 | 614 | { |
ef6e34ee | 615 | struct lxc_cmd_rsp rsp; |
ef6e34ee | 616 | int stopsignal = SIGKILL; |
2202afc9 | 617 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ef6e34ee DE |
618 | |
619 | if (handler->conf->stopsignal) | |
620 | stopsignal = handler->conf->stopsignal; | |
621 | memset(&rsp, 0, sizeof(rsp)); | |
622 | rsp.ret = kill(handler->pid, stopsignal); | |
623 | if (!rsp.ret) { | |
018051e3 CB |
624 | rsp.ret = cgroup_ops->unfreeze(cgroup_ops, -1); |
625 | if (!rsp.ret) | |
95d5b147 | 626 | return 0; |
fe84a562 CB |
627 | |
628 | ERROR("Failed to unfreeze container \"%s\"", handler->name); | |
018051e3 CB |
629 | rsp.ret = -errno; |
630 | } else { | |
631 | rsp.ret = -errno; | |
ef6e34ee DE |
632 | } |
633 | ||
634 | return lxc_cmd_rsp_send(fd, &rsp); | |
635 | } | |
d5088cf2 | 636 | |
b5159817 | 637 | /* |
2bd158cc | 638 | * lxc_cmd_terminal_winch: noop |
b5159817 DE |
639 | * |
640 | * @name : name of container to connect to | |
641 | * @lxcpath : the lxcpath in which the container is running | |
642 | * | |
643 | * Returns 0 on success, < 0 on failure | |
644 | */ | |
8ccbbf94 | 645 | int lxc_cmd_terminal_winch(const char *name, const char *lxcpath) |
b5159817 | 646 | { |
b5159817 DE |
647 | return 0; |
648 | } | |
649 | ||
8ccbbf94 | 650 | static int lxc_cmd_terminal_winch_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
651 | struct lxc_handler *handler, |
652 | struct lxc_epoll_descr *descr) | |
b5159817 | 653 | { |
2bd158cc | 654 | /* should never be called */ |
6c6497ea | 655 | return log_error_errno(-1, ENOSYS, "Called lxc_cmd_terminal_winch_callback()"); |
b5159817 DE |
656 | } |
657 | ||
ef6e34ee DE |
658 | /* |
659 | * lxc_cmd_console: Open an fd to a tty in the container | |
660 | * | |
661 | * @name : name of container to connect to | |
662 | * @ttynum : in: the tty to open or -1 for next available | |
663 | * : out: the tty allocated | |
664 | * @fd : out: file descriptor for master side of pty | |
665 | * @lxcpath : the lxcpath in which the container is running | |
666 | * | |
0115f8fd | 667 | * Returns fd holding tty allocated on success, < 0 on failure |
ef6e34ee DE |
668 | */ |
669 | int lxc_cmd_console(const char *name, int *ttynum, int *fd, const char *lxcpath) | |
670 | { | |
8259d86d | 671 | __do_free struct lxc_cmd_console_rsp_data *rspdata = NULL; |
0ecf64b5 | 672 | int ret, stopped; |
ef6e34ee | 673 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
674 | .req = { |
675 | .cmd = LXC_CMD_CONSOLE, | |
676 | .data = INT_TO_PTR(*ttynum), | |
677 | }, | |
ef6e34ee | 678 | }; |
d5088cf2 | 679 | |
88556fd7 | 680 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
681 | if (ret < 0) |
682 | return ret; | |
0115f8fd | 683 | |
8259d86d | 684 | rspdata = cmd.rsp.data; |
6c6497ea CB |
685 | if (cmd.rsp.ret < 0) |
686 | return log_error_errno(-1, -cmd.rsp.ret, "Denied access to tty"); | |
d5088cf2 | 687 | |
6c6497ea CB |
688 | if (ret == 0) |
689 | return log_error(-1, "tty number %d invalid, busy or all ttys busy", *ttynum); | |
ef6e34ee | 690 | |
6c6497ea CB |
691 | if (rspdata->masterfd < 0) |
692 | return log_error(-1, "Unable to allocate fd for tty %d", rspdata->ttynum); | |
ef6e34ee | 693 | |
fe84a562 | 694 | ret = cmd.rsp.ret; /* socket fd */ |
0115f8fd | 695 | *fd = rspdata->masterfd; |
ef6e34ee | 696 | *ttynum = rspdata->ttynum; |
fe84a562 | 697 | |
6c6497ea | 698 | return log_info(ret, "Alloced fd %d for tty %d via socket %d", *fd, rspdata->ttynum, ret); |
ef6e34ee DE |
699 | } |
700 | ||
701 | static int lxc_cmd_console_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
702 | struct lxc_handler *handler, |
703 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 704 | { |
fe84a562 | 705 | int masterfd, ret; |
ef6e34ee | 706 | struct lxc_cmd_rsp rsp; |
fe84a562 | 707 | int ttynum = PTR_TO_INT(req->data); |
ef6e34ee | 708 | |
c1ee47cd | 709 | masterfd = lxc_terminal_allocate(handler->conf, fd, &ttynum); |
b5159817 | 710 | if (masterfd < 0) |
ef6e34ee DE |
711 | goto out_close; |
712 | ||
ef6e34ee DE |
713 | memset(&rsp, 0, sizeof(rsp)); |
714 | rsp.data = INT_TO_PTR(ttynum); | |
fe84a562 CB |
715 | ret = lxc_abstract_unix_send_fds(fd, &masterfd, 1, &rsp, sizeof(rsp)); |
716 | if (ret < 0) { | |
9044b79e | 717 | SYSERROR("Failed to send tty to client"); |
3dfe6f8d | 718 | lxc_terminal_free(handler->conf, fd); |
ef6e34ee DE |
719 | goto out_close; |
720 | } | |
721 | ||
ef6e34ee DE |
722 | return 0; |
723 | ||
724 | out_close: | |
fe84a562 CB |
725 | /* Special indicator to lxc_cmd_handler() to close the fd and do |
726 | * related cleanup. | |
ef6e34ee DE |
727 | */ |
728 | return 1; | |
d5088cf2 CS |
729 | } |
730 | ||
88556fd7 ÇO |
731 | /* |
732 | * lxc_cmd_get_name: Returns the name of the container | |
733 | * | |
734 | * @hashed_sock_name: hashed socket name | |
735 | * | |
736 | * Returns the name on success, NULL on failure. | |
737 | */ | |
738 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
739 | { | |
740 | int ret, stopped; | |
741 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
742 | .req = { |
743 | .cmd = LXC_CMD_GET_NAME, | |
744 | }, | |
88556fd7 ÇO |
745 | }; |
746 | ||
747 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 748 | if (ret < 0) |
88556fd7 | 749 | return NULL; |
88556fd7 ÇO |
750 | |
751 | if (cmd.rsp.ret == 0) | |
752 | return cmd.rsp.data; | |
fe84a562 | 753 | |
88556fd7 ÇO |
754 | return NULL; |
755 | } | |
756 | ||
757 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
758 | struct lxc_handler *handler, |
759 | struct lxc_epoll_descr *descr) | |
88556fd7 ÇO |
760 | { |
761 | struct lxc_cmd_rsp rsp; | |
762 | ||
763 | memset(&rsp, 0, sizeof(rsp)); | |
764 | ||
f0ecc19d | 765 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
766 | rsp.datalen = strlen(handler->name) + 1; |
767 | rsp.ret = 0; | |
768 | ||
769 | return lxc_cmd_rsp_send(fd, &rsp); | |
770 | } | |
771 | ||
772 | /* | |
773 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
774 | * | |
775 | * @hashed_sock_name: hashed socket name | |
776 | * | |
777 | * Returns the lxcpath on success, NULL on failure. | |
778 | */ | |
779 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
780 | { | |
781 | int ret, stopped; | |
782 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
783 | .req = { |
784 | .cmd = LXC_CMD_GET_LXCPATH, | |
785 | }, | |
88556fd7 | 786 | }; |
724e753c | 787 | |
88556fd7 | 788 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 789 | if (ret < 0) |
88556fd7 | 790 | return NULL; |
88556fd7 ÇO |
791 | |
792 | if (cmd.rsp.ret == 0) | |
793 | return cmd.rsp.data; | |
fe84a562 | 794 | |
88556fd7 ÇO |
795 | return NULL; |
796 | } | |
797 | ||
798 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
799 | struct lxc_handler *handler, |
800 | struct lxc_epoll_descr *descr) | |
88556fd7 | 801 | { |
6c6497ea CB |
802 | struct lxc_cmd_rsp rsp = { |
803 | .ret = 0, | |
804 | .data = (char *)handler->lxcpath, | |
805 | .datalen = strlen(handler->lxcpath) + 1, | |
806 | }; | |
88556fd7 ÇO |
807 | |
808 | return lxc_cmd_rsp_send(fd, &rsp); | |
809 | } | |
ef6e34ee | 810 | |
54446942 | 811 | int lxc_cmd_add_state_client(const char *name, const char *lxcpath, |
92e35018 CB |
812 | lxc_state_t states[MAX_STATE], |
813 | int *state_client_fd) | |
dbc9832d | 814 | { |
cd889e57 | 815 | __do_close_prot_errno int clientfd = -EBADF; |
bc631984 | 816 | int state, stopped; |
dbc9832d | 817 | ssize_t ret; |
dbc9832d | 818 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
819 | .req = { |
820 | .cmd = LXC_CMD_ADD_STATE_CLIENT, | |
821 | .data = states, | |
822 | .datalen = (sizeof(lxc_state_t) * MAX_STATE) | |
823 | }, | |
dbc9832d CB |
824 | }; |
825 | ||
dbc9832d | 826 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
827 | if (states[STOPPED] != 0 && stopped != 0) |
828 | return STOPPED; | |
829 | ||
dbc9832d | 830 | if (ret < 0) { |
f577e061 | 831 | if (errno != ECONNREFUSED) |
6d1400b5 | 832 | SYSERROR("Failed to execute command"); |
833 | ||
dbc9832d CB |
834 | return -1; |
835 | } | |
fe84a562 | 836 | |
dbc9832d CB |
837 | /* We should now be guaranteed to get an answer from the state sending |
838 | * function. | |
839 | */ | |
cd889e57 | 840 | clientfd = cmd.rsp.ret; |
6c6497ea CB |
841 | if (clientfd < 0) |
842 | return log_error_errno(-1, -clientfd, "Failed to receive socket fd"); | |
dbc9832d | 843 | |
bc631984 | 844 | state = PTR_TO_INT(cmd.rsp.data); |
6c6497ea CB |
845 | if (state < MAX_STATE) |
846 | return log_trace(state, "Container is already in requested state %s", lxc_state2str(state)); | |
bc631984 | 847 | |
240fecd0 | 848 | *state_client_fd = move_fd(clientfd); |
6c6497ea | 849 | return log_trace(MAX_STATE, "Added state client %d to state client list", *state_client_fd); |
dbc9832d CB |
850 | } |
851 | ||
ebbca852 | 852 | static int lxc_cmd_add_state_client_callback(__owns int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
853 | struct lxc_handler *handler, |
854 | struct lxc_epoll_descr *descr) | |
dbc9832d | 855 | { |
44552fb2 | 856 | int ret; |
dbc9832d | 857 | struct lxc_cmd_rsp rsp = {0}; |
dbc9832d | 858 | |
fe84a562 | 859 | if (req->datalen < 0) |
44552fb2 | 860 | goto reap_client_fd; |
dbc9832d | 861 | |
71fc9c04 | 862 | if (req->datalen != (sizeof(lxc_state_t) * MAX_STATE)) |
44552fb2 | 863 | goto reap_client_fd; |
dbc9832d | 864 | |
fe84a562 | 865 | if (!req->data) |
44552fb2 | 866 | goto reap_client_fd; |
dbc9832d | 867 | |
c01c2be6 | 868 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 CB |
869 | if (rsp.ret < 0) |
870 | goto reap_client_fd; | |
871 | ||
bc631984 | 872 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 873 | |
44552fb2 CB |
874 | ret = lxc_cmd_rsp_send(fd, &rsp); |
875 | if (ret < 0) | |
876 | goto reap_client_fd; | |
877 | ||
ebbca852 MH |
878 | /* close fd if state is already achieved to avoid leakage */ |
879 | if (rsp.ret != MAX_STATE) | |
880 | close(fd); | |
881 | ||
44552fb2 CB |
882 | return 0; |
883 | ||
884 | reap_client_fd: | |
885 | /* Special indicator to lxc_cmd_handler() to close the fd and do related | |
886 | * cleanup. | |
887 | */ | |
888 | return 1; | |
dbc9832d CB |
889 | } |
890 | ||
2a63b5cb CB |
891 | int lxc_cmd_add_bpf_device_cgroup(const char *name, const char *lxcpath, |
892 | struct device_item *device) | |
893 | { | |
894 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
895 | int stopped = 0; | |
896 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
897 | .req = { |
898 | .cmd = LXC_CMD_ADD_BPF_DEVICE_CGROUP, | |
899 | .data = device, | |
900 | .datalen = sizeof(struct device_item), | |
901 | }, | |
2a63b5cb CB |
902 | }; |
903 | int ret; | |
904 | ||
905 | if (strlen(device->access) > STRLITERALLEN("rwm")) | |
3d0327ed | 906 | return log_error_errno(-1, EINVAL, "Invalid access mode specified %s", |
2a63b5cb CB |
907 | device->access); |
908 | ||
909 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
910 | if (ret < 0 || cmd.rsp.ret < 0) | |
3d0327ed | 911 | return log_error_errno(-1, errno, "Failed to add new bpf device cgroup rule"); |
2a63b5cb CB |
912 | |
913 | return 0; | |
914 | #else | |
3d0327ed | 915 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
916 | #endif |
917 | } | |
918 | ||
919 | static int lxc_cmd_add_bpf_device_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
920 | struct lxc_handler *handler, | |
921 | struct lxc_epoll_descr *descr) | |
922 | { | |
923 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
924 | __do_bpf_program_free struct bpf_program *devices = NULL; | |
925 | struct lxc_cmd_rsp rsp = {0}; | |
926 | struct lxc_conf *conf = handler->conf; | |
927 | struct hierarchy *unified = handler->cgroup_ops->unified; | |
2a63b5cb CB |
928 | int ret; |
929 | struct lxc_list *it; | |
930 | struct device_item *device; | |
931 | struct bpf_program *devices_old; | |
932 | ||
933 | if (req->datalen <= 0) | |
934 | goto reap_client_fd; | |
935 | ||
936 | if (req->datalen != sizeof(struct device_item)) | |
937 | goto reap_client_fd; | |
938 | ||
939 | if (!req->data) | |
940 | goto reap_client_fd; | |
941 | device = (struct device_item *)req->data; | |
942 | ||
943 | rsp.ret = -1; | |
944 | if (!unified) | |
945 | goto respond; | |
946 | ||
947 | ret = bpf_list_add_device(conf, device); | |
948 | if (ret < 0) | |
949 | goto respond; | |
950 | ||
951 | devices = bpf_program_new(BPF_PROG_TYPE_CGROUP_DEVICE); | |
952 | if (!devices) | |
953 | goto respond; | |
954 | ||
955 | ret = bpf_program_init(devices); | |
956 | if (ret) | |
957 | goto respond; | |
958 | ||
959 | lxc_list_for_each(it, &conf->devices) { | |
960 | struct device_item *cur = it->elem; | |
961 | ||
962 | ret = bpf_program_append_device(devices, cur); | |
963 | if (ret) | |
964 | goto respond; | |
965 | } | |
966 | ||
967 | ret = bpf_program_finalize(devices); | |
968 | if (ret) | |
969 | goto respond; | |
970 | ||
971 | ret = bpf_program_cgroup_attach(devices, BPF_CGROUP_DEVICE, | |
972 | unified->container_full_path, | |
973 | BPF_F_ALLOW_MULTI); | |
974 | if (ret) | |
975 | goto respond; | |
976 | ||
977 | /* Replace old bpf program. */ | |
978 | devices_old = move_ptr(conf->cgroup2_devices); | |
979 | conf->cgroup2_devices = move_ptr(devices); | |
980 | devices = move_ptr(devices_old); | |
981 | ||
982 | rsp.ret = 0; | |
983 | ||
984 | respond: | |
985 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
986 | if (ret < 0) | |
987 | goto reap_client_fd; | |
988 | ||
989 | return 0; | |
990 | ||
991 | reap_client_fd: | |
992 | /* Special indicator to lxc_cmd_handler() to close the fd and do related | |
993 | * cleanup. | |
994 | */ | |
995 | return 1; | |
996 | #else | |
3d0327ed | 997 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
998 | #endif |
999 | } | |
1000 | ||
191d43cc CB |
1001 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
1002 | struct lxc_console_log *log) | |
1003 | { | |
1004 | int ret, stopped; | |
1005 | struct lxc_cmd_console_log data; | |
1006 | struct lxc_cmd_rr cmd; | |
1007 | ||
1008 | data.clear = log->clear; | |
1009 | data.read = log->read; | |
1010 | data.read_max = *log->read_max; | |
1011 | ||
1012 | cmd.req.cmd = LXC_CMD_CONSOLE_LOG; | |
1013 | cmd.req.data = &data; | |
1014 | cmd.req.datalen = sizeof(struct lxc_cmd_console_log); | |
1015 | ||
1016 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1017 | if (ret < 0) | |
1018 | return ret; | |
1019 | ||
1020 | /* There is nothing to be read from the buffer. So clear any values we | |
1021 | * where passed to clearly indicate to the user that nothing went wrong. | |
1022 | */ | |
63b74cda | 1023 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
1024 | *log->read_max = 0; |
1025 | log->data = NULL; | |
1026 | } | |
1027 | ||
1028 | /* This is a proper error so don't touch any values we were passed. */ | |
1029 | if (cmd.rsp.ret < 0) | |
1030 | return cmd.rsp.ret; | |
1031 | ||
1032 | *log->read_max = cmd.rsp.datalen; | |
1033 | log->data = cmd.rsp.data; | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1039 | struct lxc_handler *handler, |
1040 | struct lxc_epoll_descr *descr) | |
191d43cc CB |
1041 | { |
1042 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 1043 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc CB |
1044 | const struct lxc_cmd_console_log *log = req->data; |
1045 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; | |
1046 | ||
1047 | rsp.ret = -EFAULT; | |
1048 | rsp.datalen = 0; | |
1049 | rsp.data = NULL; | |
28f3b1cd | 1050 | if (buffer_size <= 0) |
191d43cc CB |
1051 | goto out; |
1052 | ||
5928191e CB |
1053 | if (log->read || log->write_logfile) |
1054 | rsp.datalen = lxc_ringbuf_used(buf); | |
1055 | ||
191d43cc CB |
1056 | if (log->read) |
1057 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
1058 | ||
1059 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
1060 | rsp.datalen = log->read_max; | |
1061 | ||
1062 | /* there's nothing to read */ | |
63b74cda | 1063 | rsp.ret = -ENODATA; |
191d43cc | 1064 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
1065 | goto out; |
1066 | ||
63b74cda | 1067 | rsp.ret = 0; |
23e0d9af | 1068 | if (log->clear) |
43366ca2 | 1069 | lxc_ringbuf_clear(buf); /* clear the ringbuffer */ |
23e0d9af | 1070 | else if (rsp.datalen > 0) |
191d43cc CB |
1071 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
1072 | ||
1073 | out: | |
1074 | return lxc_cmd_rsp_send(fd, &rsp); | |
1075 | } | |
1076 | ||
974a8aba CB |
1077 | int lxc_cmd_serve_state_clients(const char *name, const char *lxcpath, |
1078 | lxc_state_t state) | |
1079 | { | |
1080 | int stopped; | |
1081 | ssize_t ret; | |
1082 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
1083 | .req = { |
1084 | .cmd = LXC_CMD_SERVE_STATE_CLIENTS, | |
1085 | .data = INT_TO_PTR(state) | |
1086 | }, | |
974a8aba CB |
1087 | }; |
1088 | ||
1089 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1090 | if (ret < 0) |
1091 | return log_error_errno(-1, errno, "Failed to serve state clients"); | |
974a8aba CB |
1092 | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static int lxc_cmd_serve_state_clients_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1097 | struct lxc_handler *handler, |
1098 | struct lxc_epoll_descr *descr) | |
974a8aba CB |
1099 | { |
1100 | int ret; | |
1101 | lxc_state_t state = PTR_TO_INT(req->data); | |
1102 | struct lxc_cmd_rsp rsp = {0}; | |
1103 | ||
1104 | ret = lxc_serve_state_clients(handler->name, handler, state); | |
1105 | if (ret < 0) | |
1106 | goto reap_client_fd; | |
1107 | ||
1108 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1109 | if (ret < 0) | |
1110 | goto reap_client_fd; | |
1111 | ||
1112 | return 0; | |
1113 | ||
1114 | reap_client_fd: | |
6c6497ea CB |
1115 | /* |
1116 | * Special indicator to lxc_cmd_handler() to close the fd and do | |
1117 | * related cleanup. | |
974a8aba CB |
1118 | */ |
1119 | return 1; | |
1120 | } | |
1121 | ||
cdb2a47f CB |
1122 | int lxc_cmd_seccomp_notify_add_listener(const char *name, const char *lxcpath, |
1123 | int fd, | |
1124 | /* unused */ unsigned int command, | |
1125 | /* unused */ unsigned int flags) | |
1126 | { | |
1127 | ||
c3e3c21a | 1128 | #ifdef HAVE_SECCOMP_NOTIFY |
cdb2a47f CB |
1129 | int ret, stopped; |
1130 | struct lxc_cmd_rr cmd = { | |
1131 | .req = { | |
1132 | .cmd = LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER, | |
1133 | .data = INT_TO_PTR(fd), | |
1134 | }, | |
1135 | }; | |
1136 | ||
1137 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1138 | if (ret < 0) |
1139 | return log_error_errno(-1, errno, "Failed to add seccomp listener"); | |
cdb2a47f CB |
1140 | |
1141 | return cmd.rsp.ret; | |
1142 | #else | |
3d0327ed | 1143 | return ret_set_errno(-1, ENOSYS); |
cdb2a47f CB |
1144 | #endif |
1145 | } | |
1146 | ||
1147 | static int lxc_cmd_seccomp_notify_add_listener_callback(int fd, | |
1148 | struct lxc_cmd_req *req, | |
1149 | struct lxc_handler *handler, | |
1150 | struct lxc_epoll_descr *descr) | |
1151 | { | |
1152 | struct lxc_cmd_rsp rsp = {0}; | |
cdb2a47f | 1153 | |
c3e3c21a CB |
1154 | #ifdef HAVE_SECCOMP_NOTIFY |
1155 | int ret; | |
cdb2a47f | 1156 | __do_close_prot_errno int recv_fd = -EBADF; |
cdb2a47f | 1157 | |
c3e3c21a CB |
1158 | ret = lxc_abstract_unix_recv_fds(fd, &recv_fd, 1, NULL, 0); |
1159 | if (ret <= 0) { | |
1160 | rsp.ret = -errno; | |
1161 | goto out; | |
cdb2a47f CB |
1162 | } |
1163 | ||
c3e3c21a CB |
1164 | if (!handler->conf->seccomp.notifier.wants_supervision || |
1165 | handler->conf->seccomp.notifier.proxy_fd < 0) { | |
1166 | SYSERROR("No seccomp proxy fd specified"); | |
1167 | rsp.ret = -EINVAL; | |
1168 | goto out; | |
1169 | } | |
cdb2a47f | 1170 | |
c3e3c21a | 1171 | ret = lxc_mainloop_add_handler(descr, recv_fd, seccomp_notify_handler, |
cdb2a47f | 1172 | handler); |
c3e3c21a CB |
1173 | if (ret < 0) { |
1174 | rsp.ret = -errno; | |
1175 | goto out; | |
1176 | } | |
68a9e3eb | 1177 | move_fd(recv_fd); |
cdb2a47f | 1178 | |
c3e3c21a | 1179 | out: |
cdb2a47f CB |
1180 | #else |
1181 | rsp.ret = -ENOSYS; | |
cdb2a47f | 1182 | |
c3e3c21a CB |
1183 | #endif |
1184 | return lxc_cmd_rsp_send(fd, &rsp); | |
cdb2a47f CB |
1185 | } |
1186 | ||
018051e3 CB |
1187 | int lxc_cmd_freeze(const char *name, const char *lxcpath, int timeout) |
1188 | { | |
1189 | int ret, stopped; | |
1190 | struct lxc_cmd_rr cmd = { | |
1191 | .req = { | |
1192 | .cmd = LXC_CMD_FREEZE, | |
1193 | .data = INT_TO_PTR(timeout), | |
1194 | }, | |
1195 | }; | |
1196 | ||
1197 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1198 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1199 | return log_error_errno(-1, errno, "Failed to freeze container"); |
018051e3 CB |
1200 | |
1201 | return cmd.rsp.ret; | |
1202 | } | |
1203 | ||
1204 | static int lxc_cmd_freeze_callback(int fd, struct lxc_cmd_req *req, | |
1205 | struct lxc_handler *handler, | |
1206 | struct lxc_epoll_descr *descr) | |
1207 | { | |
1208 | int timeout = PTR_TO_INT(req->data); | |
1209 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1210 | .ret = -ENOENT, |
018051e3 CB |
1211 | }; |
1212 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1213 | ||
1973b62a | 1214 | if (pure_unified_layout(ops)) |
018051e3 CB |
1215 | rsp.ret = ops->freeze(ops, timeout); |
1216 | ||
1217 | return lxc_cmd_rsp_send(fd, &rsp); | |
1218 | } | |
1219 | ||
1220 | int lxc_cmd_unfreeze(const char *name, const char *lxcpath, int timeout) | |
1221 | { | |
1222 | int ret, stopped; | |
1223 | struct lxc_cmd_rr cmd = { | |
1224 | .req = { | |
1225 | .cmd = LXC_CMD_UNFREEZE, | |
1226 | .data = INT_TO_PTR(timeout), | |
1227 | }, | |
1228 | }; | |
1229 | ||
1230 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1231 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1232 | return log_error_errno(-1, errno, "Failed to unfreeze container"); |
018051e3 CB |
1233 | |
1234 | return cmd.rsp.ret; | |
1235 | } | |
1236 | ||
1237 | static int lxc_cmd_unfreeze_callback(int fd, struct lxc_cmd_req *req, | |
1238 | struct lxc_handler *handler, | |
1239 | struct lxc_epoll_descr *descr) | |
1240 | { | |
1241 | int timeout = PTR_TO_INT(req->data); | |
1242 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1243 | .ret = -ENOENT, |
018051e3 CB |
1244 | }; |
1245 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1246 | ||
1973b62a | 1247 | if (pure_unified_layout(ops)) |
018051e3 CB |
1248 | rsp.ret = ops->unfreeze(ops, timeout); |
1249 | ||
1250 | return lxc_cmd_rsp_send(fd, &rsp); | |
1251 | } | |
1252 | ||
bad788b0 CB |
1253 | int lxc_cmd_get_cgroup2_fd(const char *name, const char *lxcpath) |
1254 | { | |
1255 | int ret, stopped; | |
1256 | struct lxc_cmd_rr cmd = { | |
1257 | .req = { | |
1258 | .cmd = LXC_CMD_GET_CGROUP2_FD, | |
1259 | }, | |
1260 | }; | |
1261 | ||
1262 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
23a917e5 CB |
1263 | if (ret < 0) |
1264 | return -1; | |
1265 | ||
1266 | if (cmd.rsp.ret < 0) | |
900b6606 | 1267 | return log_debug_errno(-1, errno, "Failed to receive cgroup2 fd"); |
bad788b0 CB |
1268 | |
1269 | return PTR_TO_INT(cmd.rsp.data); | |
1270 | } | |
1271 | ||
1272 | static int lxc_cmd_get_cgroup2_fd_callback(int fd, struct lxc_cmd_req *req, | |
1273 | struct lxc_handler *handler, | |
1274 | struct lxc_epoll_descr *descr) | |
1275 | { | |
1276 | struct lxc_cmd_rsp rsp = { | |
1277 | .ret = -EINVAL, | |
1278 | }; | |
1279 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1280 | int ret; | |
1281 | ||
1973b62a | 1282 | if (!pure_unified_layout(ops) || !ops->unified) |
bad788b0 CB |
1283 | return lxc_cmd_rsp_send(fd, &rsp); |
1284 | ||
1285 | rsp.ret = 0; | |
1973b62a | 1286 | ret = lxc_abstract_unix_send_fds(fd, &ops->unified->cgfd_con, 1, &rsp, |
bad788b0 CB |
1287 | sizeof(rsp)); |
1288 | if (ret < 0) | |
1289 | return log_error(1, "Failed to send cgroup2 fd"); | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
ef6e34ee | 1294 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1295 | struct lxc_handler *handler, |
1296 | struct lxc_epoll_descr *descr) | |
724e753c | 1297 | { |
cdb2a47f CB |
1298 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *, |
1299 | struct lxc_epoll_descr *); | |
ef6e34ee DE |
1300 | |
1301 | callback cb[LXC_CMD_MAX] = { | |
2a63b5cb CB |
1302 | [LXC_CMD_CONSOLE] = lxc_cmd_console_callback, |
1303 | [LXC_CMD_TERMINAL_WINCH] = lxc_cmd_terminal_winch_callback, | |
1304 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, | |
1305 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1306 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1307 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1308 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1309 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1310 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1311 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1312 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
1313 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, | |
1314 | [LXC_CMD_SERVE_STATE_CLIENTS] = lxc_cmd_serve_state_clients_callback, | |
1315 | [LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER] = lxc_cmd_seccomp_notify_add_listener_callback, | |
1316 | [LXC_CMD_ADD_BPF_DEVICE_CGROUP] = lxc_cmd_add_bpf_device_cgroup_callback, | |
018051e3 CB |
1317 | [LXC_CMD_FREEZE] = lxc_cmd_freeze_callback, |
1318 | [LXC_CMD_UNFREEZE] = lxc_cmd_unfreeze_callback, | |
bad788b0 | 1319 | [LXC_CMD_GET_CGROUP2_FD] = lxc_cmd_get_cgroup2_fd_callback, |
724e753c MN |
1320 | }; |
1321 | ||
23a917e5 CB |
1322 | if (req->cmd >= LXC_CMD_MAX) |
1323 | return log_error_errno(-1, ENOENT, "Undefined command id %d", req->cmd); | |
1324 | ||
cdb2a47f | 1325 | return cb[req->cmd](fd, req, handler, descr); |
724e753c MN |
1326 | } |
1327 | ||
ef6e34ee | 1328 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
cdb2a47f | 1329 | struct lxc_epoll_descr *descr, const lxc_cmd_t cmd) |
724e753c | 1330 | { |
f6fc1565 CB |
1331 | struct lxc_list *cur, *next; |
1332 | ||
3dfe6f8d | 1333 | lxc_terminal_free(handler->conf, fd); |
724e753c | 1334 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 | 1335 | |
cdb2a47f CB |
1336 | switch (cmd) { |
1337 | case LXC_CMD_ADD_STATE_CLIENT: | |
1338 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { | |
1339 | struct lxc_state_client *client = cur->elem; | |
1340 | ||
1341 | if (client->clientfd != fd) | |
1342 | continue; | |
1343 | ||
1344 | /* kick client from list */ | |
1345 | lxc_list_del(cur); | |
1346 | close(client->clientfd); | |
1347 | free(cur->elem); | |
1348 | free(cur); | |
1349 | /* No need to walk the whole list. If we found the state | |
1350 | * client fd there can't be a second one. | |
1351 | */ | |
1352 | break; | |
1353 | } | |
b1ca434a | 1354 | break; |
cdb2a47f CB |
1355 | default: |
1356 | close(fd); | |
f6fc1565 | 1357 | } |
724e753c MN |
1358 | } |
1359 | ||
84c92abd DE |
1360 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1361 | struct lxc_epoll_descr *descr) | |
724e753c | 1362 | { |
5265a60c | 1363 | __do_free void *reqdata = NULL; |
724e753c | 1364 | int ret; |
ef6e34ee | 1365 | struct lxc_cmd_req req; |
724e753c MN |
1366 | struct lxc_handler *handler = data; |
1367 | ||
aae93dd3 | 1368 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
ded1d23f | 1369 | if (ret < 0) { |
fe84a562 | 1370 | SYSERROR("Failed to receive data on command socket for command " |
9044b79e | 1371 | "\"%s\"", lxc_cmd_str(req.cmd)); |
1372 | ||
1373 | if (errno == EACCES) { | |
1374 | /* We don't care for the peer, just send and close. */ | |
1375 | struct lxc_cmd_rsp rsp = {.ret = ret}; | |
1376 | ||
1377 | lxc_cmd_rsp_send(fd, &rsp); | |
1378 | } | |
1379 | ||
724e753c MN |
1380 | goto out_close; |
1381 | } | |
1382 | ||
fe84a562 | 1383 | if (ret == 0) |
724e753c | 1384 | goto out_close; |
724e753c | 1385 | |
ef6e34ee | 1386 | if (ret != sizeof(req)) { |
c01c2be6 | 1387 | WARN("Failed to receive full command request. Ignoring request " |
fe84a562 | 1388 | "for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1389 | ret = -1; |
1390 | goto out_close; | |
1391 | } | |
1392 | ||
191d43cc CB |
1393 | if ((req.datalen > LXC_CMD_DATA_MAX) && |
1394 | (req.cmd != LXC_CMD_CONSOLE_LOG)) { | |
c01c2be6 | 1395 | ERROR("Received command data length %d is too large for " |
fe84a562 CB |
1396 | "command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); |
1397 | errno = EFBIG; | |
1398 | ret = -EFBIG; | |
724e753c MN |
1399 | goto out_close; |
1400 | } | |
1401 | ||
ef6e34ee | 1402 | if (req.datalen > 0) { |
5265a60c | 1403 | reqdata = must_realloc(NULL, req.datalen); |
e3233f26 | 1404 | ret = lxc_recv_nointr(fd, reqdata, req.datalen, 0); |
ef6e34ee | 1405 | if (ret != req.datalen) { |
c01c2be6 | 1406 | WARN("Failed to receive full command request. Ignoring " |
fe84a562 | 1407 | "request for \"%s\"", lxc_cmd_str(req.cmd)); |
b2a48508 | 1408 | ret = LXC_MAINLOOP_ERROR; |
ef6e34ee DE |
1409 | goto out_close; |
1410 | } | |
fe84a562 | 1411 | |
ef6e34ee DE |
1412 | req.data = reqdata; |
1413 | } | |
1414 | ||
cdb2a47f | 1415 | ret = lxc_cmd_process(fd, &req, handler, descr); |
724e753c | 1416 | if (ret) { |
fe84a562 | 1417 | /* This is not an error, but only a request to close fd. */ |
b2a48508 | 1418 | ret = LXC_MAINLOOP_CONTINUE; |
724e753c MN |
1419 | goto out_close; |
1420 | } | |
1421 | ||
1422 | out: | |
1423 | return ret; | |
fe84a562 | 1424 | |
724e753c | 1425 | out_close: |
f6fc1565 | 1426 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
1427 | goto out; |
1428 | } | |
1429 | ||
84c92abd DE |
1430 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
1431 | struct lxc_epoll_descr *descr) | |
724e753c | 1432 | { |
4c2effce | 1433 | __do_close_prot_errno int connection = -EBADF; |
fe84a562 | 1434 | int opt = 1, ret = -1; |
724e753c MN |
1435 | |
1436 | connection = accept(fd, NULL, 0); | |
6c6497ea CB |
1437 | if (connection < 0) |
1438 | return log_error_errno(LXC_MAINLOOP_ERROR, errno, "Failed to accept connection to run command"); | |
724e753c | 1439 | |
fe84a562 | 1440 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1441 | if (ret < 0) |
1442 | return log_error_errno(ret, errno, "Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc | 1443 | |
fe84a562 | 1444 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
6c6497ea CB |
1445 | if (ret < 0) |
1446 | return log_error_errno(ret, errno, "Failed to enable necessary credentials on command socket"); | |
724e753c | 1447 | |
ef6e34ee | 1448 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
6c6497ea CB |
1449 | if (ret) |
1450 | return log_error(ret, "Failed to add command handler"); | |
724e753c | 1451 | |
240fecd0 | 1452 | move_fd(connection); |
724e753c | 1453 | return ret; |
724e753c MN |
1454 | } |
1455 | ||
9dfa4041 | 1456 | int lxc_cmd_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 1457 | { |
c13e7111 CB |
1458 | __do_close_prot_errno int fd = -EBADF; |
1459 | int ret; | |
b1234129 | 1460 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
724e753c | 1461 | |
5b46db1a | 1462 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, NULL, suffix); |
fe84a562 | 1463 | if (ret < 0) |
9ba8130c | 1464 | return -1; |
724e753c | 1465 | |
aae93dd3 | 1466 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 1467 | if (fd < 0) { |
08aa08fe | 1468 | if (errno == EADDRINUSE) |
fe84a562 | 1469 | ERROR("Container \"%s\" appears to be already running", name); |
6d1400b5 | 1470 | |
6c6497ea | 1471 | return log_error_errno(-1, errno, "Failed to create command socket %s", &path[1]); |
724e753c MN |
1472 | } |
1473 | ||
fe84a562 | 1474 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1475 | if (ret < 0) |
1476 | return log_error_errno(-1, errno, "Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f | 1477 | |
6c6497ea | 1478 | return log_trace(move_fd(fd), "Created abstract unix socket \"%s\"", &path[1]); |
d2e30e99 DE |
1479 | } |
1480 | ||
fe84a562 | 1481 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 1482 | struct lxc_handler *handler) |
d2e30e99 | 1483 | { |
2a30bdea | 1484 | __do_close_prot_errno int fd = handler->conf->maincmd_fd; |
fe84a562 | 1485 | int ret; |
d2e30e99 | 1486 | |
ef6e34ee | 1487 | ret = lxc_mainloop_add_handler(descr, fd, lxc_cmd_accept, handler); |
6c6497ea CB |
1488 | if (ret < 0) |
1489 | return log_error(ret, "Failed to add handler for command socket"); | |
724e753c | 1490 | |
240fecd0 | 1491 | move_fd(fd); |
724e753c MN |
1492 | return ret; |
1493 | } |