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> | |
27 | #include <sys/un.h> | |
28 | #include <unistd.h> | |
3bd1e081 | 29 | #include <errno.h> |
fac6795d | 30 | |
990570ed DG |
31 | #include <common/defaults.h> |
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 MD |
143 | struct sockaddr_un sun; |
144 | int fd; | |
a8afeb4a | 145 | int ret; |
fac6795d | 146 | |
686204ab | 147 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d DG |
148 | if (fd < 0) { |
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 MD |
170 | error_connect: |
171 | close(fd); | |
fac6795d | 172 | error: |
a8afeb4a | 173 | return ret; |
fac6795d DG |
174 | } |
175 | ||
176 | /* | |
917216f6 DG |
177 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
178 | * MUST be bind(2) before. | |
fac6795d DG |
179 | */ |
180 | int lttcomm_accept_unix_sock(int sock) | |
181 | { | |
182 | int new_fd; | |
183 | struct sockaddr_un sun; | |
184 | socklen_t len = 0; | |
185 | ||
186 | /* Blocking call */ | |
187 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
188 | if (new_fd < 0) { | |
189 | perror("accept"); | |
fac6795d DG |
190 | } |
191 | ||
192 | return new_fd; | |
fac6795d DG |
193 | } |
194 | ||
195 | /* | |
917216f6 DG |
196 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
197 | * and return the fd. | |
fac6795d DG |
198 | */ |
199 | int lttcomm_create_unix_sock(const char *pathname) | |
200 | { | |
201 | struct sockaddr_un sun; | |
202 | int fd; | |
203 | int ret = -1; | |
204 | ||
205 | /* Create server socket */ | |
206 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
207 | perror("socket"); | |
208 | goto error; | |
209 | } | |
210 | ||
211 | memset(&sun, 0, sizeof(sun)); | |
212 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
213 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
214 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 215 | |
7d8234d9 MD |
216 | /* Unlink the old file if present */ |
217 | (void) unlink(pathname); | |
fac6795d DG |
218 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
219 | if (ret < 0) { | |
220 | perror("bind"); | |
221 | goto error; | |
222 | } | |
223 | ||
224 | return fd; | |
225 | ||
226 | error: | |
227 | return ret; | |
228 | } | |
229 | ||
230 | /* | |
f158a754 | 231 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
232 | */ |
233 | int lttcomm_listen_unix_sock(int sock) | |
234 | { | |
235 | int ret; | |
236 | ||
f158a754 | 237 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d DG |
238 | if (ret < 0) { |
239 | perror("listen"); | |
240 | } | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | /* | |
917216f6 DG |
246 | * Receive data of size len in put that data into the buf param. Using recvmsg |
247 | * API. | |
fac6795d | 248 | * |
917216f6 | 249 | * Return the size of received data. |
fac6795d DG |
250 | */ |
251 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
252 | { | |
156ea65a | 253 | struct msghdr msg; |
fac6795d DG |
254 | struct iovec iov[1]; |
255 | ssize_t ret = -1; | |
256 | ||
156ea65a MD |
257 | memset(&msg, 0, sizeof(msg)); |
258 | ||
fac6795d DG |
259 | iov[0].iov_base = buf; |
260 | iov[0].iov_len = len; | |
261 | msg.msg_iov = iov; | |
262 | msg.msg_iovlen = 1; | |
263 | ||
8266852e | 264 | ret = recvmsg(sock, &msg, MSG_WAITALL); |
fac6795d DG |
265 | if (ret < 0) { |
266 | perror("recvmsg"); | |
267 | } | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
272 | /* | |
917216f6 | 273 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 274 | * |
917216f6 | 275 | * Return the size of sent data. |
fac6795d DG |
276 | */ |
277 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
278 | { | |
156ea65a | 279 | struct msghdr msg; |
fac6795d DG |
280 | struct iovec iov[1]; |
281 | ssize_t ret = -1; | |
282 | ||
156ea65a MD |
283 | memset(&msg, 0, sizeof(msg)); |
284 | ||
fac6795d DG |
285 | iov[0].iov_base = buf; |
286 | iov[0].iov_len = len; | |
287 | msg.msg_iov = iov; | |
288 | msg.msg_iovlen = 1; | |
289 | ||
290 | ret = sendmsg(sock, &msg, 0); | |
291 | if (ret < 0) { | |
292 | perror("sendmsg"); | |
293 | } | |
294 | ||
295 | return ret; | |
296 | } | |
87378cf5 DG |
297 | |
298 | /* | |
917216f6 | 299 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
300 | */ |
301 | int lttcomm_close_unix_sock(int sock) | |
302 | { | |
303 | int ret; | |
304 | ||
305 | /* Shutdown receptions and transmissions */ | |
306 | ret = shutdown(sock, SHUT_RDWR); | |
307 | if (ret < 0) { | |
308 | perror("shutdown"); | |
309 | } | |
310 | ||
311 | return ret; | |
312 | } | |
8c0faa1d DG |
313 | |
314 | /* | |
3bd1e081 MD |
315 | * Send a message accompanied by fd(s) over a unix socket. |
316 | * | |
317 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 318 | */ |
3bd1e081 | 319 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 320 | { |
156ea65a | 321 | struct msghdr msg; |
8c0faa1d DG |
322 | struct cmsghdr *cmptr; |
323 | struct iovec iov[1]; | |
324 | ssize_t ret = -1; | |
325 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
326 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 327 | char dummy = 0; |
8c0faa1d | 328 | |
156ea65a MD |
329 | memset(&msg, 0, sizeof(msg)); |
330 | ||
3bd1e081 MD |
331 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
332 | return -EINVAL; | |
8c0faa1d DG |
333 | |
334 | msg.msg_control = (caddr_t)tmp; | |
335 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
336 | ||
337 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
338 | cmptr->cmsg_level = SOL_SOCKET; |
339 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 340 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 341 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
342 | /* Sum of the length of all control messages in the buffer: */ |
343 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 344 | |
3bd1e081 MD |
345 | iov[0].iov_base = &dummy; |
346 | iov[0].iov_len = 1; | |
8c0faa1d DG |
347 | msg.msg_iov = iov; |
348 | msg.msg_iovlen = 1; | |
349 | ||
350 | ret = sendmsg(sock, &msg, 0); | |
351 | if (ret < 0) { | |
352 | perror("sendmsg"); | |
353 | } | |
8c0faa1d DG |
354 | return ret; |
355 | } | |
09de5c68 DG |
356 | |
357 | /* | |
3bd1e081 | 358 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 359 | * |
3bd1e081 MD |
360 | * Returns the size of received data, or negative error value. |
361 | * | |
362 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
363 | * actually received in nb_fd. | |
09de5c68 | 364 | */ |
3bd1e081 | 365 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
366 | { |
367 | struct iovec iov[1]; | |
3bd1e081 | 368 | ssize_t ret = 0; |
09de5c68 | 369 | struct cmsghdr *cmsg; |
3bd1e081 MD |
370 | size_t sizeof_fds = nb_fd * sizeof(int); |
371 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
156ea65a | 372 | struct msghdr msg; |
3bd1e081 | 373 | char dummy; |
09de5c68 | 374 | |
156ea65a MD |
375 | memset(&msg, 0, sizeof(msg)); |
376 | ||
09de5c68 | 377 | /* Prepare to receive the structures */ |
3bd1e081 MD |
378 | iov[0].iov_base = &dummy; |
379 | iov[0].iov_len = 1; | |
09de5c68 DG |
380 | msg.msg_iov = iov; |
381 | msg.msg_iovlen = 1; | |
382 | msg.msg_control = recv_fd; | |
383 | msg.msg_controllen = sizeof(recv_fd); | |
384 | ||
385 | ret = recvmsg(sock, &msg, 0); | |
386 | if (ret < 0) { | |
387 | perror("recvmsg fds"); | |
388 | goto end; | |
389 | } | |
3bd1e081 MD |
390 | if (ret != 1) { |
391 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
392 | ret, 1); | |
393 | goto end; | |
394 | } | |
395 | if (msg.msg_flags & MSG_CTRUNC) { | |
396 | fprintf(stderr, "Error: Control message truncated.\n"); | |
397 | ret = -1; | |
09de5c68 DG |
398 | goto end; |
399 | } | |
09de5c68 DG |
400 | cmsg = CMSG_FIRSTHDR(&msg); |
401 | if (!cmsg) { | |
3bd1e081 | 402 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
403 | ret = -1; |
404 | goto end; | |
405 | } | |
09de5c68 | 406 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 407 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
408 | ret = -1; |
409 | goto end; | |
410 | } | |
3bd1e081 MD |
411 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
412 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
413 | cmsg->cmsg_len, CMSG_LEN(sizeof_fds)); | |
414 | ret = -1; | |
415 | goto end; | |
09de5c68 | 416 | } |
3bd1e081 MD |
417 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
418 | ret = sizeof_fds; | |
09de5c68 DG |
419 | end: |
420 | return ret; | |
421 | } | |
d19d9ada DG |
422 | |
423 | /* | |
424 | * Send a message with credentials over a unix socket. | |
425 | * | |
426 | * Returns the size of data sent, or negative error value. | |
427 | */ | |
428 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) | |
429 | { | |
156ea65a | 430 | struct msghdr msg; |
d19d9ada DG |
431 | struct cmsghdr *cmptr; |
432 | struct iovec iov[1]; | |
433 | ssize_t ret = -1; | |
434 | struct ucred *creds; | |
435 | size_t sizeof_cred = sizeof(struct ucred); | |
436 | char anc_buf[CMSG_SPACE(sizeof_cred)]; | |
437 | ||
156ea65a MD |
438 | memset(&msg, 0, sizeof(msg)); |
439 | ||
d19d9ada DG |
440 | iov[0].iov_base = buf; |
441 | iov[0].iov_len = len; | |
442 | msg.msg_iov = iov; | |
443 | msg.msg_iovlen = 1; | |
444 | ||
445 | msg.msg_control = (caddr_t) anc_buf; | |
446 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
447 | ||
448 | cmptr = CMSG_FIRSTHDR(&msg); | |
449 | cmptr->cmsg_level = SOL_SOCKET; | |
450 | cmptr->cmsg_type = SCM_CREDENTIALS; | |
451 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); | |
452 | ||
453 | creds = (struct ucred *) CMSG_DATA(cmptr); | |
454 | ||
455 | creds->uid = geteuid(); | |
456 | creds->gid = getegid(); | |
457 | creds->pid = getpid(); | |
458 | ||
459 | ret = sendmsg(sock, &msg, 0); | |
460 | if (ret < 0) { | |
461 | perror("sendmsg"); | |
462 | } | |
463 | ||
464 | return ret; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Recv a message accompanied with credentials from a unix socket. | |
469 | * | |
470 | * Returns the size of received data, or negative error value. | |
471 | */ | |
472 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
473 | struct ucred *creds) | |
474 | { | |
156ea65a | 475 | struct msghdr msg; |
d19d9ada DG |
476 | struct cmsghdr *cmptr; |
477 | struct iovec iov[1]; | |
478 | ssize_t ret; | |
479 | size_t sizeof_cred = sizeof(struct ucred); | |
480 | char anc_buf[CMSG_SPACE(sizeof_cred)]; | |
481 | ||
156ea65a MD |
482 | memset(&msg, 0, sizeof(msg)); |
483 | ||
d19d9ada DG |
484 | /* Not allowed */ |
485 | if (creds == NULL) { | |
486 | ret = -1; | |
487 | goto end; | |
488 | } | |
489 | ||
490 | /* Prepare to receive the structures */ | |
491 | iov[0].iov_base = buf; | |
492 | iov[0].iov_len = len; | |
493 | msg.msg_iov = iov; | |
494 | msg.msg_iovlen = 1; | |
495 | ||
496 | msg.msg_control = anc_buf; | |
497 | msg.msg_controllen = sizeof(anc_buf); | |
498 | ||
499 | ret = recvmsg(sock, &msg, 0); | |
500 | if (ret < 0) { | |
501 | perror("recvmsg fds"); | |
502 | goto end; | |
503 | } | |
504 | ||
505 | if (msg.msg_flags & MSG_CTRUNC) { | |
506 | fprintf(stderr, "Error: Control message truncated.\n"); | |
507 | ret = -1; | |
508 | goto end; | |
509 | } | |
510 | ||
511 | cmptr = CMSG_FIRSTHDR(&msg); | |
512 | if (cmptr == NULL) { | |
513 | fprintf(stderr, "Error: Invalid control message header\n"); | |
514 | ret = -1; | |
515 | goto end; | |
516 | } | |
517 | ||
518 | if (cmptr->cmsg_level != SOL_SOCKET || | |
519 | cmptr->cmsg_type != SCM_CREDENTIALS) { | |
520 | fprintf(stderr, "Didn't received any credentials\n"); | |
521 | ret = -1; | |
522 | goto end; | |
523 | } | |
524 | ||
525 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
526 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
527 | cmptr->cmsg_len, CMSG_LEN(sizeof_cred)); | |
528 | ret = -1; | |
529 | goto end; | |
530 | } | |
531 | ||
532 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
533 | ||
534 | end: | |
535 | return ret; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Set socket option to use credentials passing. | |
540 | */ | |
541 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
542 | { | |
543 | int ret, on = 1; | |
544 | ||
545 | /* Set socket for credentials retrieval */ | |
546 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
547 | if (ret < 0) { | |
548 | perror("setsockopt creds unix sock"); | |
549 | } | |
550 | ||
551 | return ret; | |
552 | } |