Commit | Line | Data |
---|---|---|
826d496d | 1 | /* |
917216f6 DG |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
fac6795d | 4 | * |
917216f6 DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
fac6795d | 8 | * |
917216f6 DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
fac6795d | 13 | * |
917216f6 DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
1e307fab | 20 | #include <assert.h> |
fac6795d DG |
21 | #include <limits.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
fac6795d DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
fac6795d | 27 | #include <unistd.h> |
3bd1e081 | 28 | #include <errno.h> |
fac6795d | 29 | |
990570ed | 30 | #include <common/defaults.h> |
4c462e79 | 31 | #include <common/error.h> |
990570ed | 32 | |
10a8a223 | 33 | #include "sessiond-comm.h" |
fac6795d DG |
34 | |
35 | /* | |
36 | * Human readable error message. | |
37 | */ | |
38 | static const char *lttcomm_readable_code[] = { | |
39 | [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success", | |
40 | [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error", | |
41 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command", | |
7d29a247 DG |
42 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented", |
43 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain", | |
fac6795d DG |
44 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found", |
45 | [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps", | |
e065084a | 46 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found", |
f3ed775e | 47 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found", |
ce3d728c | 48 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found", |
ca95a216 | 49 | [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon", |
ae856491 | 50 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_DIR_FAIL) ] = "Create directory failed", |
379473d2 | 51 | [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed", |
520ff687 | 52 | [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed", |
379473d2 DG |
53 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable", |
54 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected", | |
27673bb6 | 55 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist", |
d9800920 | 56 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket", |
2b0bf864 | 57 | [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found", |
8e0af1b4 | 58 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EPERM) ] = "Permission denied", |
20fe2104 | 59 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available", |
394016d1 | 60 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible", |
7d29a247 | 61 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists", |
20fe2104 DG |
62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed", |
63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed", | |
f3ed775e | 64 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found", |
26cc6b4e | 65 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed", |
d36b8583 | 66 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed", |
d65106b1 | 67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed", |
f34daff7 DG |
68 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed", |
69 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed", | |
aaf26714 | 70 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed", |
8c0faa1d DG |
71 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed", |
72 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed", | |
73 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed", | |
74 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed", | |
75 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed", | |
76 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist", | |
84291629 | 77 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found", |
2ef84c95 | 78 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed", |
4466912f | 79 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CALIBRATE_FAIL) ] = "UST calibration failed", |
e0c7ec2b | 80 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_VERSION) ] = "UST tracer version is not compatible", |
0177d773 | 81 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed", |
2b0bf864 | 82 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed", |
f6a9efaa | 83 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist", |
2bdd86d4 MD |
84 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found", |
85 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed", | |
86 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed", | |
87 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed", | |
88 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed", | |
89 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed", | |
90 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed", | |
91 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed", | |
92 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed", | |
7753dea8 MD |
93 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed", |
94 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed", | |
2bdd86d4 MD |
95 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed", |
96 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed", | |
97 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist", | |
98 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found", | |
99 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed", | |
3b25d04d | 100 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist", |
be4f0921 | 101 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found", |
ae357384 | 102 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist", |
ae856491 | 103 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context", |
3bd1e081 MD |
104 | [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready", |
105 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds", | |
106 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds", | |
f2fc6720 | 107 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command", |
3bd1e081 MD |
108 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread", |
109 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd", | |
110 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up", | |
111 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally", | |
112 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error", | |
113 | [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile", | |
114 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF", | |
115 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL", | |
116 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM", | |
117 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE", | |
d65106b1 | 118 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found", |
531d29f9 | 119 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NEED_ROOT_SESSIOND) ] = "A root lttng-sessiond needs to be running, and client user part of the \"tracing\" group, to interact with kernel tracing", |
fac6795d DG |
120 | }; |
121 | ||
122 | /* | |
917216f6 DG |
123 | * Return ptr to string representing a human readable error code from the |
124 | * lttcomm_return_code enum. | |
fac6795d | 125 | * |
917216f6 | 126 | * These code MUST be negative in other to treat that as an error value. |
fac6795d DG |
127 | */ |
128 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
129 | { | |
130 | int tmp_code = -code; | |
131 | ||
132 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
133 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
134 | } | |
135 | ||
136 | return "Unknown error code"; | |
137 | } | |
138 | ||
139 | /* | |
917216f6 | 140 | * Connect to unix socket using the path name. |
fac6795d DG |
141 | */ |
142 | int lttcomm_connect_unix_sock(const char *pathname) | |
143 | { | |
686204ab | 144 | struct sockaddr_un sun; |
4c462e79 | 145 | int fd, ret, closeret; |
fac6795d | 146 | |
686204ab | 147 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d | 148 | if (fd < 0) { |
4c462e79 | 149 | PERROR("socket"); |
a8afeb4a | 150 | ret = fd; |
fac6795d DG |
151 | goto error; |
152 | } | |
153 | ||
686204ab MD |
154 | memset(&sun, 0, sizeof(sun)); |
155 | sun.sun_family = AF_UNIX; | |
156 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
99497cd0 | 157 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; |
fac6795d | 158 | |
686204ab MD |
159 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
160 | if (ret < 0) { | |
a8afeb4a | 161 | /* |
917216f6 DG |
162 | * Don't print message on connect error, because connect is used in |
163 | * normal execution to detect if sessiond is alive. | |
a8afeb4a MD |
164 | */ |
165 | goto error_connect; | |
686204ab | 166 | } |
fac6795d | 167 | |
686204ab | 168 | return fd; |
fac6795d | 169 | |
a8afeb4a | 170 | error_connect: |
4c462e79 MD |
171 | closeret = close(fd); |
172 | if (closeret) { | |
173 | PERROR("close"); | |
174 | } | |
fac6795d | 175 | error: |
a8afeb4a | 176 | return ret; |
fac6795d DG |
177 | } |
178 | ||
179 | /* | |
917216f6 DG |
180 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
181 | * MUST be bind(2) before. | |
fac6795d DG |
182 | */ |
183 | int lttcomm_accept_unix_sock(int sock) | |
184 | { | |
185 | int new_fd; | |
186 | struct sockaddr_un sun; | |
187 | socklen_t len = 0; | |
188 | ||
189 | /* Blocking call */ | |
190 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
191 | if (new_fd < 0) { | |
4c462e79 | 192 | PERROR("accept"); |
fac6795d DG |
193 | } |
194 | ||
195 | return new_fd; | |
fac6795d DG |
196 | } |
197 | ||
198 | /* | |
917216f6 DG |
199 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
200 | * and return the fd. | |
fac6795d DG |
201 | */ |
202 | int lttcomm_create_unix_sock(const char *pathname) | |
203 | { | |
204 | struct sockaddr_un sun; | |
205 | int fd; | |
206 | int ret = -1; | |
207 | ||
208 | /* Create server socket */ | |
209 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
4c462e79 | 210 | PERROR("socket"); |
fac6795d DG |
211 | goto error; |
212 | } | |
213 | ||
214 | memset(&sun, 0, sizeof(sun)); | |
215 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
216 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
217 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 218 | |
7d8234d9 MD |
219 | /* Unlink the old file if present */ |
220 | (void) unlink(pathname); | |
fac6795d DG |
221 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
222 | if (ret < 0) { | |
4c462e79 | 223 | PERROR("bind"); |
fac6795d DG |
224 | goto error; |
225 | } | |
226 | ||
227 | return fd; | |
228 | ||
229 | error: | |
230 | return ret; | |
231 | } | |
232 | ||
233 | /* | |
f158a754 | 234 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
235 | */ |
236 | int lttcomm_listen_unix_sock(int sock) | |
237 | { | |
238 | int ret; | |
239 | ||
f158a754 | 240 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d | 241 | if (ret < 0) { |
4c462e79 | 242 | PERROR("listen"); |
fac6795d DG |
243 | } |
244 | ||
245 | return ret; | |
246 | } | |
247 | ||
248 | /* | |
917216f6 DG |
249 | * Receive data of size len in put that data into the buf param. Using recvmsg |
250 | * API. | |
fac6795d | 251 | * |
917216f6 | 252 | * Return the size of received data. |
fac6795d DG |
253 | */ |
254 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
255 | { | |
156ea65a | 256 | struct msghdr msg; |
fac6795d DG |
257 | struct iovec iov[1]; |
258 | ssize_t ret = -1; | |
259 | ||
156ea65a MD |
260 | memset(&msg, 0, sizeof(msg)); |
261 | ||
fac6795d DG |
262 | iov[0].iov_base = buf; |
263 | iov[0].iov_len = len; | |
264 | msg.msg_iov = iov; | |
265 | msg.msg_iovlen = 1; | |
266 | ||
8266852e | 267 | ret = recvmsg(sock, &msg, MSG_WAITALL); |
fac6795d | 268 | if (ret < 0) { |
4c462e79 | 269 | PERROR("recvmsg"); |
fac6795d DG |
270 | } |
271 | ||
272 | return ret; | |
273 | } | |
274 | ||
275 | /* | |
917216f6 | 276 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 277 | * |
917216f6 | 278 | * Return the size of sent data. |
fac6795d DG |
279 | */ |
280 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
281 | { | |
156ea65a | 282 | struct msghdr msg; |
fac6795d DG |
283 | struct iovec iov[1]; |
284 | ssize_t ret = -1; | |
285 | ||
156ea65a MD |
286 | memset(&msg, 0, sizeof(msg)); |
287 | ||
fac6795d DG |
288 | iov[0].iov_base = buf; |
289 | iov[0].iov_len = len; | |
290 | msg.msg_iov = iov; | |
291 | msg.msg_iovlen = 1; | |
292 | ||
293 | ret = sendmsg(sock, &msg, 0); | |
294 | if (ret < 0) { | |
d2641a83 MD |
295 | /* |
296 | * Only warn about EPIPE when quiet mode is deactivated. | |
297 | * We consider EPIPE as expected. | |
298 | */ | |
299 | if (errno != EPIPE || !opt_quiet) { | |
300 | PERROR("sendmsg"); | |
301 | } | |
fac6795d DG |
302 | } |
303 | ||
304 | return ret; | |
305 | } | |
87378cf5 DG |
306 | |
307 | /* | |
917216f6 | 308 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
309 | */ |
310 | int lttcomm_close_unix_sock(int sock) | |
311 | { | |
4c462e79 | 312 | int ret, closeret; |
87378cf5 DG |
313 | |
314 | /* Shutdown receptions and transmissions */ | |
315 | ret = shutdown(sock, SHUT_RDWR); | |
316 | if (ret < 0) { | |
4c462e79 | 317 | PERROR("shutdown"); |
87378cf5 DG |
318 | } |
319 | ||
4c462e79 MD |
320 | closeret = close(sock); |
321 | if (closeret) { | |
322 | PERROR("close"); | |
323 | } | |
b0ef677e | 324 | |
87378cf5 DG |
325 | return ret; |
326 | } | |
8c0faa1d DG |
327 | |
328 | /* | |
3bd1e081 MD |
329 | * Send a message accompanied by fd(s) over a unix socket. |
330 | * | |
331 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 332 | */ |
3bd1e081 | 333 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 334 | { |
156ea65a | 335 | struct msghdr msg; |
8c0faa1d DG |
336 | struct cmsghdr *cmptr; |
337 | struct iovec iov[1]; | |
338 | ssize_t ret = -1; | |
339 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
340 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 341 | char dummy = 0; |
8c0faa1d | 342 | |
156ea65a MD |
343 | memset(&msg, 0, sizeof(msg)); |
344 | ||
3bd1e081 MD |
345 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
346 | return -EINVAL; | |
8c0faa1d DG |
347 | |
348 | msg.msg_control = (caddr_t)tmp; | |
349 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
350 | ||
351 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
352 | cmptr->cmsg_level = SOL_SOCKET; |
353 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 354 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 355 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
356 | /* Sum of the length of all control messages in the buffer: */ |
357 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 358 | |
3bd1e081 MD |
359 | iov[0].iov_base = &dummy; |
360 | iov[0].iov_len = 1; | |
8c0faa1d DG |
361 | msg.msg_iov = iov; |
362 | msg.msg_iovlen = 1; | |
363 | ||
364 | ret = sendmsg(sock, &msg, 0); | |
365 | if (ret < 0) { | |
d2641a83 MD |
366 | /* |
367 | * Only warn about EPIPE when quiet mode is deactivated. | |
368 | * We consider EPIPE as expected. | |
369 | */ | |
370 | if (errno != EPIPE || !opt_quiet) { | |
371 | PERROR("sendmsg"); | |
372 | } | |
8c0faa1d | 373 | } |
8c0faa1d DG |
374 | return ret; |
375 | } | |
09de5c68 DG |
376 | |
377 | /* | |
3bd1e081 | 378 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 379 | * |
3bd1e081 MD |
380 | * Returns the size of received data, or negative error value. |
381 | * | |
382 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
383 | * actually received in nb_fd. | |
09de5c68 | 384 | */ |
3bd1e081 | 385 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
386 | { |
387 | struct iovec iov[1]; | |
3bd1e081 | 388 | ssize_t ret = 0; |
09de5c68 | 389 | struct cmsghdr *cmsg; |
3bd1e081 MD |
390 | size_t sizeof_fds = nb_fd * sizeof(int); |
391 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
156ea65a | 392 | struct msghdr msg; |
3bd1e081 | 393 | char dummy; |
09de5c68 | 394 | |
156ea65a MD |
395 | memset(&msg, 0, sizeof(msg)); |
396 | ||
09de5c68 | 397 | /* Prepare to receive the structures */ |
3bd1e081 MD |
398 | iov[0].iov_base = &dummy; |
399 | iov[0].iov_len = 1; | |
09de5c68 DG |
400 | msg.msg_iov = iov; |
401 | msg.msg_iovlen = 1; | |
402 | msg.msg_control = recv_fd; | |
403 | msg.msg_controllen = sizeof(recv_fd); | |
404 | ||
405 | ret = recvmsg(sock, &msg, 0); | |
406 | if (ret < 0) { | |
4c462e79 | 407 | PERROR("recvmsg fds"); |
09de5c68 DG |
408 | goto end; |
409 | } | |
3bd1e081 MD |
410 | if (ret != 1) { |
411 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
412 | ret, 1); | |
413 | goto end; | |
414 | } | |
415 | if (msg.msg_flags & MSG_CTRUNC) { | |
416 | fprintf(stderr, "Error: Control message truncated.\n"); | |
417 | ret = -1; | |
09de5c68 DG |
418 | goto end; |
419 | } | |
09de5c68 DG |
420 | cmsg = CMSG_FIRSTHDR(&msg); |
421 | if (!cmsg) { | |
3bd1e081 | 422 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
423 | ret = -1; |
424 | goto end; | |
425 | } | |
09de5c68 | 426 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 427 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
428 | ret = -1; |
429 | goto end; | |
430 | } | |
3bd1e081 MD |
431 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
432 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 433 | (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); |
3bd1e081 MD |
434 | ret = -1; |
435 | goto end; | |
09de5c68 | 436 | } |
3bd1e081 MD |
437 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
438 | ret = sizeof_fds; | |
09de5c68 DG |
439 | end: |
440 | return ret; | |
441 | } | |
d19d9ada DG |
442 | |
443 | /* | |
444 | * Send a message with credentials over a unix socket. | |
445 | * | |
446 | * Returns the size of data sent, or negative error value. | |
447 | */ | |
448 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) | |
449 | { | |
156ea65a | 450 | struct msghdr msg; |
d19d9ada DG |
451 | struct iovec iov[1]; |
452 | ssize_t ret = -1; | |
d27c42b8 MD |
453 | #ifdef __linux__ |
454 | struct cmsghdr *cmptr; | |
b17231c6 | 455 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 456 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
b17231c6 | 457 | lttng_sock_cred *creds; |
d27c42b8 | 458 | #endif /* __linux__ */ |
d19d9ada | 459 | |
156ea65a MD |
460 | memset(&msg, 0, sizeof(msg)); |
461 | ||
d19d9ada DG |
462 | iov[0].iov_base = buf; |
463 | iov[0].iov_len = len; | |
464 | msg.msg_iov = iov; | |
465 | msg.msg_iovlen = 1; | |
466 | ||
d27c42b8 | 467 | #ifdef __linux__ |
d19d9ada DG |
468 | msg.msg_control = (caddr_t) anc_buf; |
469 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
470 | ||
471 | cmptr = CMSG_FIRSTHDR(&msg); | |
472 | cmptr->cmsg_level = SOL_SOCKET; | |
b17231c6 | 473 | cmptr->cmsg_type = LTTNG_SOCK_CREDS; |
d19d9ada DG |
474 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); |
475 | ||
b17231c6 | 476 | creds = (lttng_sock_cred*) CMSG_DATA(cmptr); |
d19d9ada | 477 | |
b17231c6 DG |
478 | LTTNG_SOCK_SET_UID_CRED(creds, geteuid()); |
479 | LTTNG_SOCK_SET_GID_CRED(creds, getegid()); | |
480 | LTTNG_SOCK_SET_PID_CRED(creds, getpid()); | |
d27c42b8 | 481 | #endif /* __linux__ */ |
d19d9ada DG |
482 | |
483 | ret = sendmsg(sock, &msg, 0); | |
484 | if (ret < 0) { | |
d2641a83 MD |
485 | /* |
486 | * Only warn about EPIPE when quiet mode is deactivated. | |
487 | * We consider EPIPE as expected. | |
488 | */ | |
489 | if (errno != EPIPE || !opt_quiet) { | |
490 | PERROR("sendmsg"); | |
491 | } | |
d19d9ada | 492 | } |
d19d9ada DG |
493 | return ret; |
494 | } | |
495 | ||
496 | /* | |
497 | * Recv a message accompanied with credentials from a unix socket. | |
498 | * | |
499 | * Returns the size of received data, or negative error value. | |
500 | */ | |
501 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
b17231c6 | 502 | lttng_sock_cred *creds) |
d19d9ada | 503 | { |
156ea65a | 504 | struct msghdr msg; |
d19d9ada DG |
505 | struct iovec iov[1]; |
506 | ssize_t ret; | |
d27c42b8 MD |
507 | #ifdef __linux__ |
508 | struct cmsghdr *cmptr; | |
b17231c6 | 509 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 510 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
d27c42b8 | 511 | #endif /* __linux__ */ |
d19d9ada | 512 | |
156ea65a MD |
513 | memset(&msg, 0, sizeof(msg)); |
514 | ||
d19d9ada DG |
515 | /* Not allowed */ |
516 | if (creds == NULL) { | |
517 | ret = -1; | |
518 | goto end; | |
519 | } | |
520 | ||
521 | /* Prepare to receive the structures */ | |
522 | iov[0].iov_base = buf; | |
523 | iov[0].iov_len = len; | |
524 | msg.msg_iov = iov; | |
525 | msg.msg_iovlen = 1; | |
526 | ||
d27c42b8 | 527 | #ifdef __linux__ |
d19d9ada DG |
528 | msg.msg_control = anc_buf; |
529 | msg.msg_controllen = sizeof(anc_buf); | |
d27c42b8 | 530 | #endif /* __linux__ */ |
d19d9ada DG |
531 | |
532 | ret = recvmsg(sock, &msg, 0); | |
533 | if (ret < 0) { | |
4c462e79 | 534 | PERROR("recvmsg fds"); |
d19d9ada DG |
535 | goto end; |
536 | } | |
537 | ||
d27c42b8 | 538 | #ifdef __linux__ |
d19d9ada DG |
539 | if (msg.msg_flags & MSG_CTRUNC) { |
540 | fprintf(stderr, "Error: Control message truncated.\n"); | |
541 | ret = -1; | |
542 | goto end; | |
543 | } | |
544 | ||
545 | cmptr = CMSG_FIRSTHDR(&msg); | |
546 | if (cmptr == NULL) { | |
547 | fprintf(stderr, "Error: Invalid control message header\n"); | |
548 | ret = -1; | |
549 | goto end; | |
550 | } | |
551 | ||
552 | if (cmptr->cmsg_level != SOL_SOCKET || | |
b17231c6 | 553 | cmptr->cmsg_type != LTTNG_SOCK_CREDS) { |
d19d9ada DG |
554 | fprintf(stderr, "Didn't received any credentials\n"); |
555 | ret = -1; | |
556 | goto end; | |
557 | } | |
558 | ||
559 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
560 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 561 | (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred)); |
d19d9ada DG |
562 | ret = -1; |
563 | goto end; | |
564 | } | |
565 | ||
566 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
d27c42b8 | 567 | #elif defined(__FreeBSD__) |
9e89c931 MD |
568 | { |
569 | int peer_ret; | |
570 | ||
571 | peer_ret = getpeereid(sock, &creds->uid, &creds->gid); | |
572 | if (peer_ret != 0) { | |
573 | return peer_ret; | |
574 | } | |
67cf0ab7 | 575 | } |
d27c42b8 MD |
576 | #else |
577 | #error "Please implement credential support for your OS." | |
578 | #endif /* __linux__ */ | |
d19d9ada DG |
579 | |
580 | end: | |
581 | return ret; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Set socket option to use credentials passing. | |
586 | */ | |
d27c42b8 | 587 | #ifdef __linux__ |
d19d9ada DG |
588 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
589 | { | |
590 | int ret, on = 1; | |
591 | ||
592 | /* Set socket for credentials retrieval */ | |
593 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
594 | if (ret < 0) { | |
4c462e79 | 595 | PERROR("setsockopt creds unix sock"); |
d19d9ada | 596 | } |
d19d9ada DG |
597 | return ret; |
598 | } | |
d27c42b8 MD |
599 | #elif defined(__FreeBSD__) |
600 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
601 | { | |
602 | return 0; | |
603 | } | |
604 | #else | |
605 | #error "Please implement credential support for your OS." | |
606 | #endif /* __linux__ */ |