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> | |
ca4537d3 | 27 | #include <sys/un.h> |
fac6795d | 28 | #include <unistd.h> |
3bd1e081 | 29 | #include <errno.h> |
fac6795d | 30 | |
990570ed | 31 | #include <common/defaults.h> |
4c462e79 | 32 | #include <common/error.h> |
990570ed | 33 | |
10a8a223 | 34 | #include "sessiond-comm.h" |
fac6795d DG |
35 | |
36 | /* | |
37 | * Human readable error message. | |
38 | */ | |
39 | static const char *lttcomm_readable_code[] = { | |
40 | [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success", | |
41 | [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error", | |
42 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command", | |
7d29a247 DG |
43 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented", |
44 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain", | |
fac6795d DG |
45 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found", |
46 | [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps", | |
e065084a | 47 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found", |
f3ed775e | 48 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found", |
ce3d728c | 49 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found", |
ca95a216 | 50 | [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon", |
ae856491 | 51 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_DIR_FAIL) ] = "Create directory failed", |
379473d2 | 52 | [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed", |
520ff687 | 53 | [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed", |
379473d2 DG |
54 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable", |
55 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected", | |
27673bb6 | 56 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist", |
d9800920 | 57 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket", |
2b0bf864 | 58 | [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found", |
8e0af1b4 | 59 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EPERM) ] = "Permission denied", |
20fe2104 | 60 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available", |
394016d1 | 61 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible", |
7d29a247 | 62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists", |
20fe2104 DG |
63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed", |
64 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed", | |
f3ed775e | 65 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found", |
26cc6b4e | 66 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed", |
d36b8583 | 67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed", |
d65106b1 | 68 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed", |
f34daff7 DG |
69 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed", |
70 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed", | |
aaf26714 | 71 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed", |
8c0faa1d DG |
72 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed", |
73 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed", | |
74 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed", | |
75 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed", | |
76 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed", | |
77 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist", | |
84291629 | 78 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found", |
2ef84c95 | 79 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed", |
4466912f | 80 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CALIBRATE_FAIL) ] = "UST calibration failed", |
e0c7ec2b | 81 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_VERSION) ] = "UST tracer version is not compatible", |
0177d773 | 82 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed", |
2b0bf864 | 83 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed", |
f6a9efaa | 84 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist", |
2bdd86d4 MD |
85 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found", |
86 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed", | |
87 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed", | |
88 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed", | |
89 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed", | |
90 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed", | |
91 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed", | |
92 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed", | |
93 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed", | |
7753dea8 MD |
94 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed", |
95 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed", | |
2bdd86d4 MD |
96 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed", |
97 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed", | |
98 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist", | |
99 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found", | |
100 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed", | |
3b25d04d | 101 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist", |
be4f0921 | 102 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found", |
ae357384 | 103 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist", |
ae856491 | 104 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context", |
3bd1e081 MD |
105 | [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready", |
106 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds", | |
107 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds", | |
f2fc6720 | 108 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command", |
3bd1e081 MD |
109 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread", |
110 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd", | |
111 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up", | |
112 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally", | |
113 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error", | |
114 | [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile", | |
115 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF", | |
116 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL", | |
117 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM", | |
118 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE", | |
d65106b1 | 119 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found", |
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", | |
ca4537d3 | 433 | cmsg->cmsg_len, 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 cmsghdr *cmptr; |
452 | struct iovec iov[1]; | |
453 | ssize_t ret = -1; | |
ca4537d3 DG |
454 | struct ucred *creds; |
455 | size_t sizeof_cred = sizeof(struct ucred); | |
d19d9ada DG |
456 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
457 | ||
156ea65a MD |
458 | memset(&msg, 0, sizeof(msg)); |
459 | ||
d19d9ada DG |
460 | iov[0].iov_base = buf; |
461 | iov[0].iov_len = len; | |
462 | msg.msg_iov = iov; | |
463 | msg.msg_iovlen = 1; | |
464 | ||
465 | msg.msg_control = (caddr_t) anc_buf; | |
466 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
467 | ||
468 | cmptr = CMSG_FIRSTHDR(&msg); | |
469 | cmptr->cmsg_level = SOL_SOCKET; | |
ca4537d3 | 470 | cmptr->cmsg_type = SCM_CREDENTIALS; |
d19d9ada DG |
471 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); |
472 | ||
ca4537d3 | 473 | creds = (struct ucred *) CMSG_DATA(cmptr); |
d19d9ada | 474 | |
ca4537d3 DG |
475 | creds->uid = geteuid(); |
476 | creds->gid = getegid(); | |
477 | creds->pid = getpid(); | |
d19d9ada DG |
478 | |
479 | ret = sendmsg(sock, &msg, 0); | |
480 | if (ret < 0) { | |
d2641a83 MD |
481 | /* |
482 | * Only warn about EPIPE when quiet mode is deactivated. | |
483 | * We consider EPIPE as expected. | |
484 | */ | |
485 | if (errno != EPIPE || !opt_quiet) { | |
486 | PERROR("sendmsg"); | |
487 | } | |
d19d9ada | 488 | } |
d19d9ada DG |
489 | return ret; |
490 | } | |
491 | ||
492 | /* | |
493 | * Recv a message accompanied with credentials from a unix socket. | |
494 | * | |
495 | * Returns the size of received data, or negative error value. | |
496 | */ | |
497 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
ca4537d3 | 498 | struct ucred *creds) |
d19d9ada | 499 | { |
156ea65a | 500 | struct msghdr msg; |
d19d9ada DG |
501 | struct cmsghdr *cmptr; |
502 | struct iovec iov[1]; | |
503 | ssize_t ret; | |
ca4537d3 | 504 | size_t sizeof_cred = sizeof(struct ucred); |
d19d9ada DG |
505 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
506 | ||
156ea65a MD |
507 | memset(&msg, 0, sizeof(msg)); |
508 | ||
d19d9ada DG |
509 | /* Not allowed */ |
510 | if (creds == NULL) { | |
511 | ret = -1; | |
512 | goto end; | |
513 | } | |
514 | ||
515 | /* Prepare to receive the structures */ | |
516 | iov[0].iov_base = buf; | |
517 | iov[0].iov_len = len; | |
518 | msg.msg_iov = iov; | |
519 | msg.msg_iovlen = 1; | |
520 | ||
521 | msg.msg_control = anc_buf; | |
522 | msg.msg_controllen = sizeof(anc_buf); | |
523 | ||
524 | ret = recvmsg(sock, &msg, 0); | |
525 | if (ret < 0) { | |
4c462e79 | 526 | PERROR("recvmsg fds"); |
d19d9ada DG |
527 | goto end; |
528 | } | |
529 | ||
530 | if (msg.msg_flags & MSG_CTRUNC) { | |
531 | fprintf(stderr, "Error: Control message truncated.\n"); | |
532 | ret = -1; | |
533 | goto end; | |
534 | } | |
535 | ||
536 | cmptr = CMSG_FIRSTHDR(&msg); | |
537 | if (cmptr == NULL) { | |
538 | fprintf(stderr, "Error: Invalid control message header\n"); | |
539 | ret = -1; | |
540 | goto end; | |
541 | } | |
542 | ||
543 | if (cmptr->cmsg_level != SOL_SOCKET || | |
ca4537d3 | 544 | cmptr->cmsg_type != SCM_CREDENTIALS) { |
d19d9ada DG |
545 | fprintf(stderr, "Didn't received any credentials\n"); |
546 | ret = -1; | |
547 | goto end; | |
548 | } | |
549 | ||
550 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
551 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
ca4537d3 | 552 | cmptr->cmsg_len, CMSG_LEN(sizeof_cred)); |
d19d9ada DG |
553 | ret = -1; |
554 | goto end; | |
555 | } | |
556 | ||
557 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
558 | ||
559 | end: | |
560 | return ret; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Set socket option to use credentials passing. | |
565 | */ | |
566 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
567 | { | |
568 | int ret, on = 1; | |
569 | ||
570 | /* Set socket for credentials retrieval */ | |
571 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
572 | if (ret < 0) { | |
4c462e79 | 573 | PERROR("setsockopt creds unix sock"); |
d19d9ada DG |
574 | } |
575 | ||
576 | return ret; | |
577 | } |