Header Alignment Cleanups
[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.c
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
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6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
18
19#define _GNU_SOURCE
20#include <limits.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <sys/socket.h>
25#include <sys/stat.h>
26#include <sys/types.h>
27#include <sys/un.h>
28#include <unistd.h>
159c7ff4 29#include <assert.h>
fac6795d 30
773168b7 31#include <lttng/lttng-sessiond-comm.h>
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32
33/*
34 * Human readable error message.
35 */
36static const char *lttcomm_readable_code[] = {
37 [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success",
38 [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error",
39 [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command",
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40 [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented",
41 [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
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42 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
43 [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
e065084a 44 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
f3ed775e 45 [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found",
ce3d728c 46 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
ca95a216 47 [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
df0da139 48 [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
379473d2 49 [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
520ff687 50 [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
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51 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
52 [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
27673bb6 53 [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
20fe2104 54 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
7d29a247 55 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists",
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56 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
57 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
f3ed775e 58 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
26cc6b4e 59 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
d36b8583 60 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed",
d65106b1 61 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed",
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62 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
63 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
aaf26714 64 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
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65 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
66 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
67 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
68 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
69 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
70 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
84291629 71 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
2ef84c95 72 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
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73 [ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
74 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
75 [ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
76 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread",
77 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd",
78 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up",
79 [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally",
80 [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error",
81 [ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile",
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82 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF",
83 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL",
84 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM",
85 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE",
d65106b1 86 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found",
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87};
88
89/*
90 * lttcom_get_readable_code
91 *
92 * Return ptr to string representing a human readable
93 * error code from the lttcomm_return_code enum.
94 *
95 * These code MUST be negative in other to treat that
96 * as an error value.
97 */
98const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
99{
100 int tmp_code = -code;
101
102 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
103 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
104 }
105
106 return "Unknown error code";
107}
108
109/*
110 * lttcomm_connect_unix_sock
111 *
112 * Connect to unix socket using the path name.
113 */
114int lttcomm_connect_unix_sock(const char *pathname)
115{
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116 struct sockaddr_un sun;
117 int fd;
a8afeb4a 118 int ret;
fac6795d 119
686204ab 120 fd = socket(PF_UNIX, SOCK_STREAM, 0);
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121 if (fd < 0) {
122 perror("socket");
a8afeb4a 123 ret = fd;
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124 goto error;
125 }
126
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127 memset(&sun, 0, sizeof(sun));
128 sun.sun_family = AF_UNIX;
129 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
99497cd0 130 sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
fac6795d 131
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132 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
133 if (ret < 0) {
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134 /*
135 * Don't print message on connect error, because connect
136 * is used in normal execution to detect if sessiond is
137 * alive.
138 */
139 goto error_connect;
686204ab 140 }
fac6795d 141
686204ab 142 return fd;
fac6795d 143
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144error_connect:
145 close(fd);
fac6795d 146error:
a8afeb4a 147 return ret;
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148}
149
150/*
151 * lttcomm_accept_unix_sock
152 *
153 * Do an accept(2) on the sock and return the
154 * new file descriptor. The socket MUST be bind(2) before.
155 */
156int lttcomm_accept_unix_sock(int sock)
157{
158 int new_fd;
159 struct sockaddr_un sun;
160 socklen_t len = 0;
161
162 /* Blocking call */
163 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
164 if (new_fd < 0) {
165 perror("accept");
166 goto error;
167 }
168
169 return new_fd;
170
171error:
172 return -1;
173}
174
175/*
176 * lttcomm_create_unix_sock
177 *
178 * Creates a AF_UNIX local socket using pathname
179 * bind the socket upon creation and return the fd.
180 */
181int lttcomm_create_unix_sock(const char *pathname)
182{
183 struct sockaddr_un sun;
184 int fd;
185 int ret = -1;
186
187 /* Create server socket */
188 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
189 perror("socket");
190 goto error;
191 }
192
193 memset(&sun, 0, sizeof(sun));
194 sun.sun_family = AF_UNIX;
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195 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
196 sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
fac6795d 197
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198 /* Unlink the old file if present */
199 (void) unlink(pathname);
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200 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
201 if (ret < 0) {
202 perror("bind");
203 goto error;
204 }
205
206 return fd;
207
208error:
209 return ret;
210}
211
212/*
213 * lttcomm_listen_unix_sock
214 *
215 * Make the socket listen using MAX_LISTEN.
216 */
217int lttcomm_listen_unix_sock(int sock)
218{
219 int ret;
220
221 ret = listen(sock, MAX_LISTEN);
222 if (ret < 0) {
223 perror("listen");
224 }
225
226 return ret;
227}
228
229/*
230 * lttcomm_recv_unix_sock
231 *
232 * Receive data of size len in put that data into
233 * the buf param. Using recvmsg API.
234 * Return the size of received data.
235 */
236ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
237{
159c7ff4 238 struct msghdr msg = { 0 };
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239 struct iovec iov[1];
240 ssize_t ret = -1;
241
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242 iov[0].iov_base = buf;
243 iov[0].iov_len = len;
244 msg.msg_iov = iov;
245 msg.msg_iovlen = 1;
246
247 ret = recvmsg(sock, &msg, 0);
248 if (ret < 0) {
249 perror("recvmsg");
250 }
251
252 return ret;
253}
254
255/*
256 * lttcomm_send_unix_sock
257 *
258 * Send buf data of size len. Using sendmsg API.
259 * Return the size of sent data.
260 */
261ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
262{
159c7ff4 263 struct msghdr msg = { 0 };
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264 struct iovec iov[1];
265 ssize_t ret = -1;
266
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267 iov[0].iov_base = buf;
268 iov[0].iov_len = len;
269 msg.msg_iov = iov;
270 msg.msg_iovlen = 1;
271
272 ret = sendmsg(sock, &msg, 0);
273 if (ret < 0) {
274 perror("sendmsg");
275 }
276
277 return ret;
278}
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279
280/*
281 * lttcomm_close_unix_sock
282 *
283 * Shutdown cleanly a unix socket.
284 */
285int lttcomm_close_unix_sock(int sock)
286{
287 int ret;
288
289 /* Shutdown receptions and transmissions */
290 ret = shutdown(sock, SHUT_RDWR);
291 if (ret < 0) {
292 perror("shutdown");
293 }
294
295 return ret;
296}
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297
298/*
299 * lttcomm_send_fds_unix_sock
300 *
301 * Send multiple fds on a unix socket.
302 */
303ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, size_t len)
304{
159c7ff4 305 struct msghdr msg = { 0 };
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306 struct cmsghdr *cmptr;
307 struct iovec iov[1];
308 ssize_t ret = -1;
309 unsigned int sizeof_fds = nb_fd * sizeof(int);
310 char tmp[CMSG_SPACE(sizeof_fds)];
311
159c7ff4 312 /*
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313 * Note: the consumerd receiver only supports receiving one FD per
314 * message.
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315 */
316 assert(nb_fd == 1);
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317
318 msg.msg_control = (caddr_t)tmp;
319 msg.msg_controllen = CMSG_LEN(sizeof_fds);
320
321 cmptr = CMSG_FIRSTHDR(&msg);
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322 cmptr->cmsg_level = SOL_SOCKET;
323 cmptr->cmsg_type = SCM_RIGHTS;
159c7ff4 324 cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
8c0faa1d 325 memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
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326 /* Sum of the length of all control messages in the buffer: */
327 msg.msg_controllen = cmptr->cmsg_len;
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328
329 iov[0].iov_base = buf;
330 iov[0].iov_len = len;
331 msg.msg_iov = iov;
332 msg.msg_iovlen = 1;
333
334 ret = sendmsg(sock, &msg, 0);
335 if (ret < 0) {
336 perror("sendmsg");
337 }
338
339 return ret;
340}
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