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", |
fac6795d DG |
119 | }; |
120 | ||
121 | /* | |
917216f6 DG |
122 | * Return ptr to string representing a human readable error code from the |
123 | * lttcomm_return_code enum. | |
fac6795d | 124 | * |
917216f6 | 125 | * These code MUST be negative in other to treat that as an error value. |
fac6795d DG |
126 | */ |
127 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
128 | { | |
129 | int tmp_code = -code; | |
130 | ||
131 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
132 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
133 | } | |
134 | ||
135 | return "Unknown error code"; | |
136 | } | |
137 | ||
138 | /* | |
917216f6 | 139 | * Connect to unix socket using the path name. |
fac6795d DG |
140 | */ |
141 | int lttcomm_connect_unix_sock(const char *pathname) | |
142 | { | |
686204ab | 143 | struct sockaddr_un sun; |
4c462e79 | 144 | int fd, ret, closeret; |
fac6795d | 145 | |
686204ab | 146 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d | 147 | if (fd < 0) { |
4c462e79 | 148 | PERROR("socket"); |
a8afeb4a | 149 | ret = fd; |
fac6795d DG |
150 | goto error; |
151 | } | |
152 | ||
686204ab MD |
153 | memset(&sun, 0, sizeof(sun)); |
154 | sun.sun_family = AF_UNIX; | |
155 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
99497cd0 | 156 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; |
fac6795d | 157 | |
686204ab MD |
158 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
159 | if (ret < 0) { | |
a8afeb4a | 160 | /* |
917216f6 DG |
161 | * Don't print message on connect error, because connect is used in |
162 | * normal execution to detect if sessiond is alive. | |
a8afeb4a MD |
163 | */ |
164 | goto error_connect; | |
686204ab | 165 | } |
fac6795d | 166 | |
686204ab | 167 | return fd; |
fac6795d | 168 | |
a8afeb4a | 169 | error_connect: |
4c462e79 MD |
170 | closeret = close(fd); |
171 | if (closeret) { | |
172 | PERROR("close"); | |
173 | } | |
fac6795d | 174 | error: |
a8afeb4a | 175 | return ret; |
fac6795d DG |
176 | } |
177 | ||
178 | /* | |
917216f6 DG |
179 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
180 | * MUST be bind(2) before. | |
fac6795d DG |
181 | */ |
182 | int lttcomm_accept_unix_sock(int sock) | |
183 | { | |
184 | int new_fd; | |
185 | struct sockaddr_un sun; | |
186 | socklen_t len = 0; | |
187 | ||
188 | /* Blocking call */ | |
189 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
190 | if (new_fd < 0) { | |
4c462e79 | 191 | PERROR("accept"); |
fac6795d DG |
192 | } |
193 | ||
194 | return new_fd; | |
fac6795d DG |
195 | } |
196 | ||
197 | /* | |
917216f6 DG |
198 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
199 | * and return the fd. | |
fac6795d DG |
200 | */ |
201 | int lttcomm_create_unix_sock(const char *pathname) | |
202 | { | |
203 | struct sockaddr_un sun; | |
204 | int fd; | |
205 | int ret = -1; | |
206 | ||
207 | /* Create server socket */ | |
208 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
4c462e79 | 209 | PERROR("socket"); |
fac6795d DG |
210 | goto error; |
211 | } | |
212 | ||
213 | memset(&sun, 0, sizeof(sun)); | |
214 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
215 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
216 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 217 | |
7d8234d9 MD |
218 | /* Unlink the old file if present */ |
219 | (void) unlink(pathname); | |
fac6795d DG |
220 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
221 | if (ret < 0) { | |
4c462e79 | 222 | PERROR("bind"); |
fac6795d DG |
223 | goto error; |
224 | } | |
225 | ||
226 | return fd; | |
227 | ||
228 | error: | |
229 | return ret; | |
230 | } | |
231 | ||
232 | /* | |
f158a754 | 233 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
234 | */ |
235 | int lttcomm_listen_unix_sock(int sock) | |
236 | { | |
237 | int ret; | |
238 | ||
f158a754 | 239 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d | 240 | if (ret < 0) { |
4c462e79 | 241 | PERROR("listen"); |
fac6795d DG |
242 | } |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
247 | /* | |
917216f6 DG |
248 | * Receive data of size len in put that data into the buf param. Using recvmsg |
249 | * API. | |
fac6795d | 250 | * |
917216f6 | 251 | * Return the size of received data. |
fac6795d DG |
252 | */ |
253 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
254 | { | |
156ea65a | 255 | struct msghdr msg; |
fac6795d DG |
256 | struct iovec iov[1]; |
257 | ssize_t ret = -1; | |
258 | ||
156ea65a MD |
259 | memset(&msg, 0, sizeof(msg)); |
260 | ||
fac6795d DG |
261 | iov[0].iov_base = buf; |
262 | iov[0].iov_len = len; | |
263 | msg.msg_iov = iov; | |
264 | msg.msg_iovlen = 1; | |
265 | ||
8266852e | 266 | ret = recvmsg(sock, &msg, MSG_WAITALL); |
fac6795d | 267 | if (ret < 0) { |
4c462e79 | 268 | PERROR("recvmsg"); |
fac6795d DG |
269 | } |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
274 | /* | |
917216f6 | 275 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 276 | * |
917216f6 | 277 | * Return the size of sent data. |
fac6795d DG |
278 | */ |
279 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
280 | { | |
156ea65a | 281 | struct msghdr msg; |
fac6795d DG |
282 | struct iovec iov[1]; |
283 | ssize_t ret = -1; | |
284 | ||
156ea65a MD |
285 | memset(&msg, 0, sizeof(msg)); |
286 | ||
fac6795d DG |
287 | iov[0].iov_base = buf; |
288 | iov[0].iov_len = len; | |
289 | msg.msg_iov = iov; | |
290 | msg.msg_iovlen = 1; | |
291 | ||
292 | ret = sendmsg(sock, &msg, 0); | |
293 | if (ret < 0) { | |
4c462e79 | 294 | PERROR("sendmsg"); |
fac6795d DG |
295 | } |
296 | ||
297 | return ret; | |
298 | } | |
87378cf5 DG |
299 | |
300 | /* | |
917216f6 | 301 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
302 | */ |
303 | int lttcomm_close_unix_sock(int sock) | |
304 | { | |
4c462e79 | 305 | int ret, closeret; |
87378cf5 DG |
306 | |
307 | /* Shutdown receptions and transmissions */ | |
308 | ret = shutdown(sock, SHUT_RDWR); | |
309 | if (ret < 0) { | |
4c462e79 | 310 | PERROR("shutdown"); |
87378cf5 DG |
311 | } |
312 | ||
4c462e79 MD |
313 | closeret = close(sock); |
314 | if (closeret) { | |
315 | PERROR("close"); | |
316 | } | |
b0ef677e | 317 | |
87378cf5 DG |
318 | return ret; |
319 | } | |
8c0faa1d DG |
320 | |
321 | /* | |
3bd1e081 MD |
322 | * Send a message accompanied by fd(s) over a unix socket. |
323 | * | |
324 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 325 | */ |
3bd1e081 | 326 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 327 | { |
156ea65a | 328 | struct msghdr msg; |
8c0faa1d DG |
329 | struct cmsghdr *cmptr; |
330 | struct iovec iov[1]; | |
331 | ssize_t ret = -1; | |
332 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
333 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 334 | char dummy = 0; |
8c0faa1d | 335 | |
156ea65a MD |
336 | memset(&msg, 0, sizeof(msg)); |
337 | ||
3bd1e081 MD |
338 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
339 | return -EINVAL; | |
8c0faa1d DG |
340 | |
341 | msg.msg_control = (caddr_t)tmp; | |
342 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
343 | ||
344 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
345 | cmptr->cmsg_level = SOL_SOCKET; |
346 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 347 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 348 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
349 | /* Sum of the length of all control messages in the buffer: */ |
350 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 351 | |
3bd1e081 MD |
352 | iov[0].iov_base = &dummy; |
353 | iov[0].iov_len = 1; | |
8c0faa1d DG |
354 | msg.msg_iov = iov; |
355 | msg.msg_iovlen = 1; | |
356 | ||
357 | ret = sendmsg(sock, &msg, 0); | |
358 | if (ret < 0) { | |
4c462e79 | 359 | PERROR("sendmsg"); |
8c0faa1d | 360 | } |
8c0faa1d DG |
361 | return ret; |
362 | } | |
09de5c68 DG |
363 | |
364 | /* | |
3bd1e081 | 365 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 366 | * |
3bd1e081 MD |
367 | * Returns the size of received data, or negative error value. |
368 | * | |
369 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
370 | * actually received in nb_fd. | |
09de5c68 | 371 | */ |
3bd1e081 | 372 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
373 | { |
374 | struct iovec iov[1]; | |
3bd1e081 | 375 | ssize_t ret = 0; |
09de5c68 | 376 | struct cmsghdr *cmsg; |
3bd1e081 MD |
377 | size_t sizeof_fds = nb_fd * sizeof(int); |
378 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
156ea65a | 379 | struct msghdr msg; |
3bd1e081 | 380 | char dummy; |
09de5c68 | 381 | |
156ea65a MD |
382 | memset(&msg, 0, sizeof(msg)); |
383 | ||
09de5c68 | 384 | /* Prepare to receive the structures */ |
3bd1e081 MD |
385 | iov[0].iov_base = &dummy; |
386 | iov[0].iov_len = 1; | |
09de5c68 DG |
387 | msg.msg_iov = iov; |
388 | msg.msg_iovlen = 1; | |
389 | msg.msg_control = recv_fd; | |
390 | msg.msg_controllen = sizeof(recv_fd); | |
391 | ||
392 | ret = recvmsg(sock, &msg, 0); | |
393 | if (ret < 0) { | |
4c462e79 | 394 | PERROR("recvmsg fds"); |
09de5c68 DG |
395 | goto end; |
396 | } | |
3bd1e081 MD |
397 | if (ret != 1) { |
398 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
399 | ret, 1); | |
400 | goto end; | |
401 | } | |
402 | if (msg.msg_flags & MSG_CTRUNC) { | |
403 | fprintf(stderr, "Error: Control message truncated.\n"); | |
404 | ret = -1; | |
09de5c68 DG |
405 | goto end; |
406 | } | |
09de5c68 DG |
407 | cmsg = CMSG_FIRSTHDR(&msg); |
408 | if (!cmsg) { | |
3bd1e081 | 409 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
410 | ret = -1; |
411 | goto end; | |
412 | } | |
09de5c68 | 413 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 414 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
415 | ret = -1; |
416 | goto end; | |
417 | } | |
3bd1e081 MD |
418 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
419 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 420 | (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); |
3bd1e081 MD |
421 | ret = -1; |
422 | goto end; | |
09de5c68 | 423 | } |
3bd1e081 MD |
424 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
425 | ret = sizeof_fds; | |
09de5c68 DG |
426 | end: |
427 | return ret; | |
428 | } | |
d19d9ada DG |
429 | |
430 | /* | |
431 | * Send a message with credentials over a unix socket. | |
432 | * | |
433 | * Returns the size of data sent, or negative error value. | |
434 | */ | |
435 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) | |
436 | { | |
156ea65a | 437 | struct msghdr msg; |
d19d9ada DG |
438 | struct iovec iov[1]; |
439 | ssize_t ret = -1; | |
d27c42b8 MD |
440 | #ifdef __linux__ |
441 | struct cmsghdr *cmptr; | |
b17231c6 | 442 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 443 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
b17231c6 | 444 | lttng_sock_cred *creds; |
d27c42b8 | 445 | #endif /* __linux__ */ |
d19d9ada | 446 | |
156ea65a MD |
447 | memset(&msg, 0, sizeof(msg)); |
448 | ||
d19d9ada DG |
449 | iov[0].iov_base = buf; |
450 | iov[0].iov_len = len; | |
451 | msg.msg_iov = iov; | |
452 | msg.msg_iovlen = 1; | |
453 | ||
d27c42b8 | 454 | #ifdef __linux__ |
d19d9ada DG |
455 | msg.msg_control = (caddr_t) anc_buf; |
456 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
457 | ||
458 | cmptr = CMSG_FIRSTHDR(&msg); | |
459 | cmptr->cmsg_level = SOL_SOCKET; | |
b17231c6 | 460 | cmptr->cmsg_type = LTTNG_SOCK_CREDS; |
d19d9ada DG |
461 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); |
462 | ||
b17231c6 | 463 | creds = (lttng_sock_cred*) CMSG_DATA(cmptr); |
d19d9ada | 464 | |
b17231c6 DG |
465 | LTTNG_SOCK_SET_UID_CRED(creds, geteuid()); |
466 | LTTNG_SOCK_SET_GID_CRED(creds, getegid()); | |
467 | LTTNG_SOCK_SET_PID_CRED(creds, getpid()); | |
d27c42b8 | 468 | #endif /* __linux__ */ |
d19d9ada DG |
469 | |
470 | ret = sendmsg(sock, &msg, 0); | |
471 | if (ret < 0) { | |
4c462e79 | 472 | PERROR("sendmsg"); |
d19d9ada DG |
473 | } |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Recv a message accompanied with credentials from a unix socket. | |
480 | * | |
481 | * Returns the size of received data, or negative error value. | |
482 | */ | |
483 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
b17231c6 | 484 | lttng_sock_cred *creds) |
d19d9ada | 485 | { |
156ea65a | 486 | struct msghdr msg; |
d19d9ada DG |
487 | struct iovec iov[1]; |
488 | ssize_t ret; | |
d27c42b8 MD |
489 | #ifdef __linux__ |
490 | struct cmsghdr *cmptr; | |
b17231c6 | 491 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 492 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
d27c42b8 | 493 | #endif /* __linux__ */ |
d19d9ada | 494 | |
156ea65a MD |
495 | memset(&msg, 0, sizeof(msg)); |
496 | ||
d19d9ada DG |
497 | /* Not allowed */ |
498 | if (creds == NULL) { | |
499 | ret = -1; | |
500 | goto end; | |
501 | } | |
502 | ||
503 | /* Prepare to receive the structures */ | |
504 | iov[0].iov_base = buf; | |
505 | iov[0].iov_len = len; | |
506 | msg.msg_iov = iov; | |
507 | msg.msg_iovlen = 1; | |
508 | ||
d27c42b8 | 509 | #ifdef __linux__ |
d19d9ada DG |
510 | msg.msg_control = anc_buf; |
511 | msg.msg_controllen = sizeof(anc_buf); | |
d27c42b8 | 512 | #endif /* __linux__ */ |
d19d9ada DG |
513 | |
514 | ret = recvmsg(sock, &msg, 0); | |
515 | if (ret < 0) { | |
4c462e79 | 516 | PERROR("recvmsg fds"); |
d19d9ada DG |
517 | goto end; |
518 | } | |
519 | ||
d27c42b8 | 520 | #ifdef __linux__ |
d19d9ada DG |
521 | if (msg.msg_flags & MSG_CTRUNC) { |
522 | fprintf(stderr, "Error: Control message truncated.\n"); | |
523 | ret = -1; | |
524 | goto end; | |
525 | } | |
526 | ||
527 | cmptr = CMSG_FIRSTHDR(&msg); | |
528 | if (cmptr == NULL) { | |
529 | fprintf(stderr, "Error: Invalid control message header\n"); | |
530 | ret = -1; | |
531 | goto end; | |
532 | } | |
533 | ||
534 | if (cmptr->cmsg_level != SOL_SOCKET || | |
b17231c6 | 535 | cmptr->cmsg_type != LTTNG_SOCK_CREDS) { |
d19d9ada DG |
536 | fprintf(stderr, "Didn't received any credentials\n"); |
537 | ret = -1; | |
538 | goto end; | |
539 | } | |
540 | ||
541 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
542 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 543 | (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred)); |
d19d9ada DG |
544 | ret = -1; |
545 | goto end; | |
546 | } | |
547 | ||
548 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
d27c42b8 | 549 | #elif defined(__FreeBSD__) |
9e89c931 MD |
550 | { |
551 | int peer_ret; | |
552 | ||
553 | peer_ret = getpeereid(sock, &creds->uid, &creds->gid); | |
554 | if (peer_ret != 0) { | |
555 | return peer_ret; | |
556 | } | |
67cf0ab7 | 557 | } |
d27c42b8 MD |
558 | #else |
559 | #error "Please implement credential support for your OS." | |
560 | #endif /* __linux__ */ | |
d19d9ada DG |
561 | |
562 | end: | |
563 | return ret; | |
564 | } | |
565 | ||
566 | /* | |
567 | * Set socket option to use credentials passing. | |
568 | */ | |
d27c42b8 | 569 | #ifdef __linux__ |
d19d9ada DG |
570 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
571 | { | |
572 | int ret, on = 1; | |
573 | ||
574 | /* Set socket for credentials retrieval */ | |
575 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
576 | if (ret < 0) { | |
4c462e79 | 577 | PERROR("setsockopt creds unix sock"); |
d19d9ada | 578 | } |
d19d9ada DG |
579 | return ret; |
580 | } | |
d27c42b8 MD |
581 | #elif defined(__FreeBSD__) |
582 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
583 | { | |
584 | return 0; | |
585 | } | |
586 | #else | |
587 | #error "Please implement credential support for your OS." | |
588 | #endif /* __linux__ */ |