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", |
531d29f9 | 120 | [ 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 |
121 | }; |
122 | ||
123 | /* | |
917216f6 DG |
124 | * Return ptr to string representing a human readable error code from the |
125 | * lttcomm_return_code enum. | |
fac6795d | 126 | * |
917216f6 | 127 | * These code MUST be negative in other to treat that as an error value. |
fac6795d DG |
128 | */ |
129 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
130 | { | |
131 | int tmp_code = -code; | |
132 | ||
133 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
134 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
135 | } | |
136 | ||
137 | return "Unknown error code"; | |
138 | } | |
139 | ||
140 | /* | |
917216f6 | 141 | * Connect to unix socket using the path name. |
fac6795d DG |
142 | */ |
143 | int lttcomm_connect_unix_sock(const char *pathname) | |
144 | { | |
686204ab | 145 | struct sockaddr_un sun; |
4c462e79 | 146 | int fd, ret, closeret; |
fac6795d | 147 | |
686204ab | 148 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d | 149 | if (fd < 0) { |
4c462e79 | 150 | PERROR("socket"); |
a8afeb4a | 151 | ret = fd; |
fac6795d DG |
152 | goto error; |
153 | } | |
154 | ||
686204ab MD |
155 | memset(&sun, 0, sizeof(sun)); |
156 | sun.sun_family = AF_UNIX; | |
157 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
99497cd0 | 158 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; |
fac6795d | 159 | |
686204ab MD |
160 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
161 | if (ret < 0) { | |
a8afeb4a | 162 | /* |
917216f6 DG |
163 | * Don't print message on connect error, because connect is used in |
164 | * normal execution to detect if sessiond is alive. | |
a8afeb4a MD |
165 | */ |
166 | goto error_connect; | |
686204ab | 167 | } |
fac6795d | 168 | |
686204ab | 169 | return fd; |
fac6795d | 170 | |
a8afeb4a | 171 | error_connect: |
4c462e79 MD |
172 | closeret = close(fd); |
173 | if (closeret) { | |
174 | PERROR("close"); | |
175 | } | |
fac6795d | 176 | error: |
a8afeb4a | 177 | return ret; |
fac6795d DG |
178 | } |
179 | ||
180 | /* | |
917216f6 DG |
181 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
182 | * MUST be bind(2) before. | |
fac6795d DG |
183 | */ |
184 | int lttcomm_accept_unix_sock(int sock) | |
185 | { | |
186 | int new_fd; | |
187 | struct sockaddr_un sun; | |
188 | socklen_t len = 0; | |
189 | ||
190 | /* Blocking call */ | |
191 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
192 | if (new_fd < 0) { | |
4c462e79 | 193 | PERROR("accept"); |
fac6795d DG |
194 | } |
195 | ||
196 | return new_fd; | |
fac6795d DG |
197 | } |
198 | ||
199 | /* | |
917216f6 DG |
200 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
201 | * and return the fd. | |
fac6795d DG |
202 | */ |
203 | int lttcomm_create_unix_sock(const char *pathname) | |
204 | { | |
205 | struct sockaddr_un sun; | |
206 | int fd; | |
207 | int ret = -1; | |
208 | ||
209 | /* Create server socket */ | |
210 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
4c462e79 | 211 | PERROR("socket"); |
fac6795d DG |
212 | goto error; |
213 | } | |
214 | ||
215 | memset(&sun, 0, sizeof(sun)); | |
216 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
217 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
218 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 219 | |
7d8234d9 MD |
220 | /* Unlink the old file if present */ |
221 | (void) unlink(pathname); | |
fac6795d DG |
222 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
223 | if (ret < 0) { | |
4c462e79 | 224 | PERROR("bind"); |
fac6795d DG |
225 | goto error; |
226 | } | |
227 | ||
228 | return fd; | |
229 | ||
230 | error: | |
231 | return ret; | |
232 | } | |
233 | ||
234 | /* | |
f158a754 | 235 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
236 | */ |
237 | int lttcomm_listen_unix_sock(int sock) | |
238 | { | |
239 | int ret; | |
240 | ||
f158a754 | 241 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d | 242 | if (ret < 0) { |
4c462e79 | 243 | PERROR("listen"); |
fac6795d DG |
244 | } |
245 | ||
246 | return ret; | |
247 | } | |
248 | ||
249 | /* | |
917216f6 DG |
250 | * Receive data of size len in put that data into the buf param. Using recvmsg |
251 | * API. | |
fac6795d | 252 | * |
917216f6 | 253 | * Return the size of received data. |
fac6795d DG |
254 | */ |
255 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
256 | { | |
156ea65a | 257 | struct msghdr msg; |
fac6795d DG |
258 | struct iovec iov[1]; |
259 | ssize_t ret = -1; | |
260 | ||
156ea65a MD |
261 | memset(&msg, 0, sizeof(msg)); |
262 | ||
fac6795d DG |
263 | iov[0].iov_base = buf; |
264 | iov[0].iov_len = len; | |
265 | msg.msg_iov = iov; | |
266 | msg.msg_iovlen = 1; | |
267 | ||
8266852e | 268 | ret = recvmsg(sock, &msg, MSG_WAITALL); |
fac6795d | 269 | if (ret < 0) { |
4c462e79 | 270 | PERROR("recvmsg"); |
fac6795d DG |
271 | } |
272 | ||
273 | return ret; | |
274 | } | |
275 | ||
276 | /* | |
917216f6 | 277 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 278 | * |
917216f6 | 279 | * Return the size of sent data. |
fac6795d DG |
280 | */ |
281 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
282 | { | |
156ea65a | 283 | struct msghdr msg; |
fac6795d DG |
284 | struct iovec iov[1]; |
285 | ssize_t ret = -1; | |
286 | ||
156ea65a MD |
287 | memset(&msg, 0, sizeof(msg)); |
288 | ||
fac6795d DG |
289 | iov[0].iov_base = buf; |
290 | iov[0].iov_len = len; | |
291 | msg.msg_iov = iov; | |
292 | msg.msg_iovlen = 1; | |
293 | ||
294 | ret = sendmsg(sock, &msg, 0); | |
295 | if (ret < 0) { | |
d2641a83 MD |
296 | /* |
297 | * Only warn about EPIPE when quiet mode is deactivated. | |
298 | * We consider EPIPE as expected. | |
299 | */ | |
300 | if (errno != EPIPE || !opt_quiet) { | |
301 | PERROR("sendmsg"); | |
302 | } | |
fac6795d DG |
303 | } |
304 | ||
305 | return ret; | |
306 | } | |
87378cf5 DG |
307 | |
308 | /* | |
917216f6 | 309 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
310 | */ |
311 | int lttcomm_close_unix_sock(int sock) | |
312 | { | |
4c462e79 | 313 | int ret, closeret; |
87378cf5 DG |
314 | |
315 | /* Shutdown receptions and transmissions */ | |
316 | ret = shutdown(sock, SHUT_RDWR); | |
317 | if (ret < 0) { | |
4c462e79 | 318 | PERROR("shutdown"); |
87378cf5 DG |
319 | } |
320 | ||
4c462e79 MD |
321 | closeret = close(sock); |
322 | if (closeret) { | |
323 | PERROR("close"); | |
324 | } | |
b0ef677e | 325 | |
87378cf5 DG |
326 | return ret; |
327 | } | |
8c0faa1d DG |
328 | |
329 | /* | |
3bd1e081 MD |
330 | * Send a message accompanied by fd(s) over a unix socket. |
331 | * | |
332 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 333 | */ |
3bd1e081 | 334 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 335 | { |
156ea65a | 336 | struct msghdr msg; |
8c0faa1d DG |
337 | struct cmsghdr *cmptr; |
338 | struct iovec iov[1]; | |
339 | ssize_t ret = -1; | |
340 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
341 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 342 | char dummy = 0; |
8c0faa1d | 343 | |
156ea65a MD |
344 | memset(&msg, 0, sizeof(msg)); |
345 | ||
3bd1e081 MD |
346 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
347 | return -EINVAL; | |
8c0faa1d DG |
348 | |
349 | msg.msg_control = (caddr_t)tmp; | |
350 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
351 | ||
352 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
353 | cmptr->cmsg_level = SOL_SOCKET; |
354 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 355 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 356 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
357 | /* Sum of the length of all control messages in the buffer: */ |
358 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 359 | |
3bd1e081 MD |
360 | iov[0].iov_base = &dummy; |
361 | iov[0].iov_len = 1; | |
8c0faa1d DG |
362 | msg.msg_iov = iov; |
363 | msg.msg_iovlen = 1; | |
364 | ||
365 | ret = sendmsg(sock, &msg, 0); | |
366 | if (ret < 0) { | |
d2641a83 MD |
367 | /* |
368 | * Only warn about EPIPE when quiet mode is deactivated. | |
369 | * We consider EPIPE as expected. | |
370 | */ | |
371 | if (errno != EPIPE || !opt_quiet) { | |
372 | PERROR("sendmsg"); | |
373 | } | |
8c0faa1d | 374 | } |
8c0faa1d DG |
375 | return ret; |
376 | } | |
09de5c68 DG |
377 | |
378 | /* | |
3bd1e081 | 379 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 380 | * |
3bd1e081 MD |
381 | * Returns the size of received data, or negative error value. |
382 | * | |
383 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
384 | * actually received in nb_fd. | |
09de5c68 | 385 | */ |
3bd1e081 | 386 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
387 | { |
388 | struct iovec iov[1]; | |
3bd1e081 | 389 | ssize_t ret = 0; |
09de5c68 | 390 | struct cmsghdr *cmsg; |
3bd1e081 MD |
391 | size_t sizeof_fds = nb_fd * sizeof(int); |
392 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
156ea65a | 393 | struct msghdr msg; |
3bd1e081 | 394 | char dummy; |
09de5c68 | 395 | |
156ea65a MD |
396 | memset(&msg, 0, sizeof(msg)); |
397 | ||
09de5c68 | 398 | /* Prepare to receive the structures */ |
3bd1e081 MD |
399 | iov[0].iov_base = &dummy; |
400 | iov[0].iov_len = 1; | |
09de5c68 DG |
401 | msg.msg_iov = iov; |
402 | msg.msg_iovlen = 1; | |
403 | msg.msg_control = recv_fd; | |
404 | msg.msg_controllen = sizeof(recv_fd); | |
405 | ||
406 | ret = recvmsg(sock, &msg, 0); | |
407 | if (ret < 0) { | |
4c462e79 | 408 | PERROR("recvmsg fds"); |
09de5c68 DG |
409 | goto end; |
410 | } | |
3bd1e081 MD |
411 | if (ret != 1) { |
412 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
413 | ret, 1); | |
414 | goto end; | |
415 | } | |
416 | if (msg.msg_flags & MSG_CTRUNC) { | |
417 | fprintf(stderr, "Error: Control message truncated.\n"); | |
418 | ret = -1; | |
09de5c68 DG |
419 | goto end; |
420 | } | |
09de5c68 DG |
421 | cmsg = CMSG_FIRSTHDR(&msg); |
422 | if (!cmsg) { | |
3bd1e081 | 423 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
424 | ret = -1; |
425 | goto end; | |
426 | } | |
09de5c68 | 427 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 428 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
429 | ret = -1; |
430 | goto end; | |
431 | } | |
3bd1e081 MD |
432 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
433 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
ca4537d3 | 434 | cmsg->cmsg_len, CMSG_LEN(sizeof_fds)); |
3bd1e081 MD |
435 | ret = -1; |
436 | goto end; | |
09de5c68 | 437 | } |
3bd1e081 MD |
438 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
439 | ret = sizeof_fds; | |
09de5c68 DG |
440 | end: |
441 | return ret; | |
442 | } | |
d19d9ada DG |
443 | |
444 | /* | |
445 | * Send a message with credentials over a unix socket. | |
446 | * | |
447 | * Returns the size of data sent, or negative error value. | |
448 | */ | |
449 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) | |
450 | { | |
156ea65a | 451 | struct msghdr msg; |
d19d9ada DG |
452 | struct cmsghdr *cmptr; |
453 | struct iovec iov[1]; | |
454 | ssize_t ret = -1; | |
ca4537d3 DG |
455 | struct ucred *creds; |
456 | size_t sizeof_cred = sizeof(struct ucred); | |
d19d9ada DG |
457 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
458 | ||
156ea65a MD |
459 | memset(&msg, 0, sizeof(msg)); |
460 | ||
d19d9ada DG |
461 | iov[0].iov_base = buf; |
462 | iov[0].iov_len = len; | |
463 | msg.msg_iov = iov; | |
464 | msg.msg_iovlen = 1; | |
465 | ||
466 | msg.msg_control = (caddr_t) anc_buf; | |
467 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
468 | ||
469 | cmptr = CMSG_FIRSTHDR(&msg); | |
470 | cmptr->cmsg_level = SOL_SOCKET; | |
ca4537d3 | 471 | cmptr->cmsg_type = SCM_CREDENTIALS; |
d19d9ada DG |
472 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); |
473 | ||
ca4537d3 | 474 | creds = (struct ucred *) CMSG_DATA(cmptr); |
d19d9ada | 475 | |
ca4537d3 DG |
476 | creds->uid = geteuid(); |
477 | creds->gid = getegid(); | |
478 | creds->pid = getpid(); | |
d19d9ada DG |
479 | |
480 | ret = sendmsg(sock, &msg, 0); | |
481 | if (ret < 0) { | |
d2641a83 MD |
482 | /* |
483 | * Only warn about EPIPE when quiet mode is deactivated. | |
484 | * We consider EPIPE as expected. | |
485 | */ | |
486 | if (errno != EPIPE || !opt_quiet) { | |
487 | PERROR("sendmsg"); | |
488 | } | |
d19d9ada | 489 | } |
d19d9ada DG |
490 | return ret; |
491 | } | |
492 | ||
493 | /* | |
494 | * Recv a message accompanied with credentials from a unix socket. | |
495 | * | |
496 | * Returns the size of received data, or negative error value. | |
497 | */ | |
498 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
ca4537d3 | 499 | struct ucred *creds) |
d19d9ada | 500 | { |
156ea65a | 501 | struct msghdr msg; |
d19d9ada DG |
502 | struct cmsghdr *cmptr; |
503 | struct iovec iov[1]; | |
504 | ssize_t ret; | |
ca4537d3 | 505 | size_t sizeof_cred = sizeof(struct ucred); |
d19d9ada DG |
506 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
507 | ||
156ea65a MD |
508 | memset(&msg, 0, sizeof(msg)); |
509 | ||
d19d9ada DG |
510 | /* Not allowed */ |
511 | if (creds == NULL) { | |
512 | ret = -1; | |
513 | goto end; | |
514 | } | |
515 | ||
516 | /* Prepare to receive the structures */ | |
517 | iov[0].iov_base = buf; | |
518 | iov[0].iov_len = len; | |
519 | msg.msg_iov = iov; | |
520 | msg.msg_iovlen = 1; | |
521 | ||
522 | msg.msg_control = anc_buf; | |
523 | msg.msg_controllen = sizeof(anc_buf); | |
524 | ||
525 | ret = recvmsg(sock, &msg, 0); | |
526 | if (ret < 0) { | |
4c462e79 | 527 | PERROR("recvmsg fds"); |
d19d9ada DG |
528 | goto end; |
529 | } | |
530 | ||
531 | if (msg.msg_flags & MSG_CTRUNC) { | |
532 | fprintf(stderr, "Error: Control message truncated.\n"); | |
533 | ret = -1; | |
534 | goto end; | |
535 | } | |
536 | ||
537 | cmptr = CMSG_FIRSTHDR(&msg); | |
538 | if (cmptr == NULL) { | |
539 | fprintf(stderr, "Error: Invalid control message header\n"); | |
540 | ret = -1; | |
541 | goto end; | |
542 | } | |
543 | ||
544 | if (cmptr->cmsg_level != SOL_SOCKET || | |
ca4537d3 | 545 | cmptr->cmsg_type != SCM_CREDENTIALS) { |
d19d9ada DG |
546 | fprintf(stderr, "Didn't received any credentials\n"); |
547 | ret = -1; | |
548 | goto end; | |
549 | } | |
550 | ||
551 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
552 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
ca4537d3 | 553 | cmptr->cmsg_len, CMSG_LEN(sizeof_cred)); |
d19d9ada DG |
554 | ret = -1; |
555 | goto end; | |
556 | } | |
557 | ||
558 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
559 | ||
560 | end: | |
561 | return ret; | |
562 | } | |
563 | ||
564 | /* | |
565 | * Set socket option to use credentials passing. | |
566 | */ | |
567 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
568 | { | |
569 | int ret, on = 1; | |
570 | ||
571 | /* Set socket for credentials retrieval */ | |
572 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
573 | if (ret < 0) { | |
4c462e79 | 574 | PERROR("setsockopt creds unix sock"); |
d19d9ada DG |
575 | } |
576 | ||
577 | return ret; | |
578 | } |