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> | |
25 | #include <sys/socket.h> | |
26 | #include <sys/stat.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/un.h> | |
29 | #include <unistd.h> | |
3bd1e081 | 30 | #include <errno.h> |
fac6795d | 31 | |
e88129fc | 32 | #include <lttng-sessiond-comm.h> |
fac6795d DG |
33 | |
34 | /* | |
35 | * Human readable error message. | |
36 | */ | |
37 | static const char *lttcomm_readable_code[] = { | |
38 | [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success", | |
39 | [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error", | |
40 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command", | |
7d29a247 DG |
41 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented", |
42 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain", | |
fac6795d DG |
43 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found", |
44 | [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps", | |
e065084a | 45 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found", |
f3ed775e | 46 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found", |
ce3d728c | 47 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found", |
ca95a216 | 48 | [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon", |
df0da139 | 49 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed", |
379473d2 | 50 | [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed", |
520ff687 | 51 | [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed", |
379473d2 DG |
52 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable", |
53 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected", | |
27673bb6 | 54 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist", |
d9800920 | 55 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket", |
2b0bf864 | 56 | [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found", |
20fe2104 | 57 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available", |
7d29a247 | 58 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists", |
20fe2104 DG |
59 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed", |
60 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed", | |
f3ed775e | 61 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found", |
26cc6b4e | 62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed", |
d36b8583 | 63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed", |
d65106b1 | 64 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed", |
f34daff7 DG |
65 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed", |
66 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed", | |
aaf26714 | 67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed", |
8c0faa1d DG |
68 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed", |
69 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed", | |
70 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed", | |
71 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed", | |
72 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed", | |
73 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist", | |
84291629 | 74 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found", |
2ef84c95 | 75 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed", |
0177d773 | 76 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed", |
2b0bf864 | 77 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed", |
f6a9efaa | 78 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist", |
2bdd86d4 MD |
79 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found", |
80 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed", | |
81 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed", | |
82 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed", | |
83 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed", | |
84 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed", | |
85 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed", | |
86 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed", | |
87 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed", | |
7753dea8 MD |
88 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed", |
89 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed", | |
2bdd86d4 MD |
90 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed", |
91 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed", | |
92 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist", | |
93 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found", | |
94 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed", | |
3bd1e081 MD |
95 | [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready", |
96 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds", | |
97 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds", | |
f2fc6720 | 98 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command", |
3bd1e081 MD |
99 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread", |
100 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd", | |
101 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up", | |
102 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally", | |
103 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error", | |
104 | [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile", | |
105 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF", | |
106 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL", | |
107 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM", | |
108 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE", | |
d65106b1 | 109 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found", |
fac6795d DG |
110 | }; |
111 | ||
112 | /* | |
917216f6 DG |
113 | * Return ptr to string representing a human readable error code from the |
114 | * lttcomm_return_code enum. | |
fac6795d | 115 | * |
917216f6 | 116 | * These code MUST be negative in other to treat that as an error value. |
fac6795d DG |
117 | */ |
118 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
119 | { | |
120 | int tmp_code = -code; | |
121 | ||
122 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
123 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
124 | } | |
125 | ||
126 | return "Unknown error code"; | |
127 | } | |
128 | ||
129 | /* | |
917216f6 | 130 | * Connect to unix socket using the path name. |
fac6795d DG |
131 | */ |
132 | int lttcomm_connect_unix_sock(const char *pathname) | |
133 | { | |
686204ab MD |
134 | struct sockaddr_un sun; |
135 | int fd; | |
a8afeb4a | 136 | int ret; |
fac6795d | 137 | |
686204ab | 138 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d DG |
139 | if (fd < 0) { |
140 | perror("socket"); | |
a8afeb4a | 141 | ret = fd; |
fac6795d DG |
142 | goto error; |
143 | } | |
144 | ||
686204ab MD |
145 | memset(&sun, 0, sizeof(sun)); |
146 | sun.sun_family = AF_UNIX; | |
147 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
99497cd0 | 148 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; |
fac6795d | 149 | |
686204ab MD |
150 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
151 | if (ret < 0) { | |
a8afeb4a | 152 | /* |
917216f6 DG |
153 | * Don't print message on connect error, because connect is used in |
154 | * normal execution to detect if sessiond is alive. | |
a8afeb4a MD |
155 | */ |
156 | goto error_connect; | |
686204ab | 157 | } |
fac6795d | 158 | |
686204ab | 159 | return fd; |
fac6795d | 160 | |
a8afeb4a MD |
161 | error_connect: |
162 | close(fd); | |
fac6795d | 163 | error: |
a8afeb4a | 164 | return ret; |
fac6795d DG |
165 | } |
166 | ||
167 | /* | |
917216f6 DG |
168 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
169 | * MUST be bind(2) before. | |
fac6795d DG |
170 | */ |
171 | int lttcomm_accept_unix_sock(int sock) | |
172 | { | |
173 | int new_fd; | |
174 | struct sockaddr_un sun; | |
175 | socklen_t len = 0; | |
176 | ||
177 | /* Blocking call */ | |
178 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
179 | if (new_fd < 0) { | |
180 | perror("accept"); | |
181 | goto error; | |
182 | } | |
183 | ||
184 | return new_fd; | |
185 | ||
186 | error: | |
187 | return -1; | |
188 | } | |
189 | ||
190 | /* | |
917216f6 DG |
191 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
192 | * and return the fd. | |
fac6795d DG |
193 | */ |
194 | int lttcomm_create_unix_sock(const char *pathname) | |
195 | { | |
196 | struct sockaddr_un sun; | |
197 | int fd; | |
198 | int ret = -1; | |
199 | ||
200 | /* Create server socket */ | |
201 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
202 | perror("socket"); | |
203 | goto error; | |
204 | } | |
205 | ||
206 | memset(&sun, 0, sizeof(sun)); | |
207 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
208 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
209 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 210 | |
7d8234d9 MD |
211 | /* Unlink the old file if present */ |
212 | (void) unlink(pathname); | |
fac6795d DG |
213 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
214 | if (ret < 0) { | |
215 | perror("bind"); | |
216 | goto error; | |
217 | } | |
218 | ||
219 | return fd; | |
220 | ||
221 | error: | |
222 | return ret; | |
223 | } | |
224 | ||
225 | /* | |
f158a754 | 226 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
227 | */ |
228 | int lttcomm_listen_unix_sock(int sock) | |
229 | { | |
230 | int ret; | |
231 | ||
f158a754 | 232 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d DG |
233 | if (ret < 0) { |
234 | perror("listen"); | |
235 | } | |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
240 | /* | |
917216f6 DG |
241 | * Receive data of size len in put that data into the buf param. Using recvmsg |
242 | * API. | |
fac6795d | 243 | * |
917216f6 | 244 | * Return the size of received data. |
fac6795d DG |
245 | */ |
246 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
247 | { | |
159c7ff4 | 248 | struct msghdr msg = { 0 }; |
fac6795d DG |
249 | struct iovec iov[1]; |
250 | ssize_t ret = -1; | |
251 | ||
fac6795d DG |
252 | iov[0].iov_base = buf; |
253 | iov[0].iov_len = len; | |
254 | msg.msg_iov = iov; | |
255 | msg.msg_iovlen = 1; | |
256 | ||
257 | ret = recvmsg(sock, &msg, 0); | |
258 | if (ret < 0) { | |
259 | perror("recvmsg"); | |
260 | } | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
265 | /* | |
917216f6 | 266 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 267 | * |
917216f6 | 268 | * Return the size of sent data. |
fac6795d DG |
269 | */ |
270 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
271 | { | |
159c7ff4 | 272 | struct msghdr msg = { 0 }; |
fac6795d DG |
273 | struct iovec iov[1]; |
274 | ssize_t ret = -1; | |
275 | ||
fac6795d DG |
276 | iov[0].iov_base = buf; |
277 | iov[0].iov_len = len; | |
278 | msg.msg_iov = iov; | |
279 | msg.msg_iovlen = 1; | |
280 | ||
281 | ret = sendmsg(sock, &msg, 0); | |
282 | if (ret < 0) { | |
283 | perror("sendmsg"); | |
284 | } | |
285 | ||
286 | return ret; | |
287 | } | |
87378cf5 DG |
288 | |
289 | /* | |
917216f6 | 290 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
291 | */ |
292 | int lttcomm_close_unix_sock(int sock) | |
293 | { | |
294 | int ret; | |
295 | ||
296 | /* Shutdown receptions and transmissions */ | |
297 | ret = shutdown(sock, SHUT_RDWR); | |
298 | if (ret < 0) { | |
299 | perror("shutdown"); | |
300 | } | |
301 | ||
302 | return ret; | |
303 | } | |
8c0faa1d DG |
304 | |
305 | /* | |
3bd1e081 MD |
306 | * Send a message accompanied by fd(s) over a unix socket. |
307 | * | |
308 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 309 | */ |
3bd1e081 | 310 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 311 | { |
159c7ff4 | 312 | struct msghdr msg = { 0 }; |
8c0faa1d DG |
313 | struct cmsghdr *cmptr; |
314 | struct iovec iov[1]; | |
315 | ssize_t ret = -1; | |
316 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
317 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 318 | char dummy = 0; |
8c0faa1d | 319 | |
3bd1e081 MD |
320 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
321 | return -EINVAL; | |
8c0faa1d DG |
322 | |
323 | msg.msg_control = (caddr_t)tmp; | |
324 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
325 | ||
326 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
327 | cmptr->cmsg_level = SOL_SOCKET; |
328 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 329 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 330 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
331 | /* Sum of the length of all control messages in the buffer: */ |
332 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 333 | |
3bd1e081 MD |
334 | iov[0].iov_base = &dummy; |
335 | iov[0].iov_len = 1; | |
8c0faa1d DG |
336 | msg.msg_iov = iov; |
337 | msg.msg_iovlen = 1; | |
338 | ||
339 | ret = sendmsg(sock, &msg, 0); | |
340 | if (ret < 0) { | |
341 | perror("sendmsg"); | |
342 | } | |
8c0faa1d DG |
343 | return ret; |
344 | } | |
09de5c68 DG |
345 | |
346 | /* | |
3bd1e081 | 347 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 348 | * |
3bd1e081 MD |
349 | * Returns the size of received data, or negative error value. |
350 | * | |
351 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
352 | * actually received in nb_fd. | |
09de5c68 | 353 | */ |
3bd1e081 | 354 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
355 | { |
356 | struct iovec iov[1]; | |
3bd1e081 | 357 | ssize_t ret = 0; |
09de5c68 | 358 | struct cmsghdr *cmsg; |
3bd1e081 MD |
359 | size_t sizeof_fds = nb_fd * sizeof(int); |
360 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
09de5c68 | 361 | struct msghdr msg = { 0 }; |
3bd1e081 | 362 | char dummy; |
09de5c68 DG |
363 | |
364 | /* Prepare to receive the structures */ | |
3bd1e081 MD |
365 | iov[0].iov_base = &dummy; |
366 | iov[0].iov_len = 1; | |
09de5c68 DG |
367 | msg.msg_iov = iov; |
368 | msg.msg_iovlen = 1; | |
369 | msg.msg_control = recv_fd; | |
370 | msg.msg_controllen = sizeof(recv_fd); | |
371 | ||
372 | ret = recvmsg(sock, &msg, 0); | |
373 | if (ret < 0) { | |
374 | perror("recvmsg fds"); | |
375 | goto end; | |
376 | } | |
3bd1e081 MD |
377 | if (ret != 1) { |
378 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
379 | ret, 1); | |
380 | goto end; | |
381 | } | |
382 | if (msg.msg_flags & MSG_CTRUNC) { | |
383 | fprintf(stderr, "Error: Control message truncated.\n"); | |
384 | ret = -1; | |
09de5c68 DG |
385 | goto end; |
386 | } | |
09de5c68 DG |
387 | cmsg = CMSG_FIRSTHDR(&msg); |
388 | if (!cmsg) { | |
3bd1e081 | 389 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
390 | ret = -1; |
391 | goto end; | |
392 | } | |
09de5c68 | 393 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 394 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
395 | ret = -1; |
396 | goto end; | |
397 | } | |
3bd1e081 MD |
398 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
399 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
400 | cmsg->cmsg_len, CMSG_LEN(sizeof_fds)); | |
401 | ret = -1; | |
402 | goto end; | |
09de5c68 | 403 | } |
3bd1e081 MD |
404 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
405 | ret = sizeof_fds; | |
09de5c68 DG |
406 | end: |
407 | return ret; | |
408 | } |