Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
fac6795d DG |
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 | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
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. | |
fac6795d DG |
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> | |
29 | ||
30 | #include "liblttsessiondcomm.h" | |
31 | ||
32 | /* | |
33 | * Human readable error message. | |
34 | */ | |
35 | static const char *lttcomm_readable_code[] = { | |
36 | [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success", | |
37 | [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error", | |
38 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command", | |
39 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found", | |
40 | [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps", | |
e065084a | 41 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found", |
57167058 | 42 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESS) ] = "No session found", |
ce3d728c | 43 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found", |
ca95a216 | 44 | [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon", |
df0da139 | 45 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed", |
379473d2 | 46 | [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed", |
520ff687 | 47 | [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed", |
379473d2 DG |
48 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable", |
49 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected", | |
27673bb6 | 50 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist", |
20fe2104 DG |
51 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available", |
52 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed", | |
53 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed", | |
f34daff7 DG |
54 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed", |
55 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed", | |
aaf26714 | 56 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed", |
8c0faa1d DG |
57 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed", |
58 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed", | |
59 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed", | |
60 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed", | |
61 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed", | |
62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist", | |
84291629 | 63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found", |
d4a1283e JD |
64 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready", |
65 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds", | |
66 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds", | |
67 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread", | |
68 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd", | |
69 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up", | |
70 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally", | |
71 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error", | |
72 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile", | |
0632499a JD |
73 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF", |
74 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL", | |
75 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM", | |
76 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE", | |
894be886 | 77 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "No event found", |
fac6795d DG |
78 | }; |
79 | ||
80 | /* | |
81 | * lttcom_get_readable_code | |
82 | * | |
83 | * Return ptr to string representing a human readable | |
84 | * error code from the lttcomm_return_code enum. | |
85 | * | |
86 | * These code MUST be negative in other to treat that | |
87 | * as an error value. | |
88 | */ | |
89 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
90 | { | |
91 | int tmp_code = -code; | |
92 | ||
93 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
94 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
95 | } | |
96 | ||
97 | return "Unknown error code"; | |
98 | } | |
99 | ||
100 | /* | |
101 | * lttcomm_connect_unix_sock | |
102 | * | |
103 | * Connect to unix socket using the path name. | |
104 | */ | |
105 | int lttcomm_connect_unix_sock(const char *pathname) | |
106 | { | |
686204ab MD |
107 | struct sockaddr_un sun; |
108 | int fd; | |
fac6795d DG |
109 | int ret = 1; |
110 | ||
686204ab | 111 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d DG |
112 | if (fd < 0) { |
113 | perror("socket"); | |
114 | goto error; | |
115 | } | |
116 | ||
686204ab MD |
117 | memset(&sun, 0, sizeof(sun)); |
118 | sun.sun_family = AF_UNIX; | |
119 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
fac6795d | 120 | |
686204ab MD |
121 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
122 | if (ret < 0) { | |
123 | perror("connect"); | |
fac6795d | 124 | goto error; |
686204ab | 125 | } |
fac6795d | 126 | |
686204ab | 127 | return fd; |
fac6795d DG |
128 | |
129 | error: | |
130 | return -1; | |
131 | } | |
132 | ||
133 | /* | |
134 | * lttcomm_accept_unix_sock | |
135 | * | |
136 | * Do an accept(2) on the sock and return the | |
137 | * new file descriptor. The socket MUST be bind(2) before. | |
138 | */ | |
139 | int lttcomm_accept_unix_sock(int sock) | |
140 | { | |
141 | int new_fd; | |
142 | struct sockaddr_un sun; | |
143 | socklen_t len = 0; | |
144 | ||
145 | /* Blocking call */ | |
146 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
147 | if (new_fd < 0) { | |
148 | perror("accept"); | |
149 | goto error; | |
150 | } | |
151 | ||
152 | return new_fd; | |
153 | ||
154 | error: | |
155 | return -1; | |
156 | } | |
157 | ||
158 | /* | |
159 | * lttcomm_create_unix_sock | |
160 | * | |
161 | * Creates a AF_UNIX local socket using pathname | |
162 | * bind the socket upon creation and return the fd. | |
163 | */ | |
164 | int lttcomm_create_unix_sock(const char *pathname) | |
165 | { | |
166 | struct sockaddr_un sun; | |
167 | int fd; | |
168 | int ret = -1; | |
169 | ||
170 | /* Create server socket */ | |
171 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
172 | perror("socket"); | |
173 | goto error; | |
174 | } | |
175 | ||
176 | memset(&sun, 0, sizeof(sun)); | |
177 | sun.sun_family = AF_UNIX; | |
178 | strncpy(sun.sun_path, pathname, strlen(pathname)); | |
179 | ||
180 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); | |
181 | if (ret < 0) { | |
182 | perror("bind"); | |
183 | goto error; | |
184 | } | |
185 | ||
186 | return fd; | |
187 | ||
188 | error: | |
189 | return ret; | |
190 | } | |
191 | ||
192 | /* | |
193 | * lttcomm_listen_unix_sock | |
194 | * | |
195 | * Make the socket listen using MAX_LISTEN. | |
196 | */ | |
197 | int lttcomm_listen_unix_sock(int sock) | |
198 | { | |
199 | int ret; | |
200 | ||
201 | ret = listen(sock, MAX_LISTEN); | |
202 | if (ret < 0) { | |
203 | perror("listen"); | |
204 | } | |
205 | ||
206 | return ret; | |
207 | } | |
208 | ||
209 | /* | |
210 | * lttcomm_recv_unix_sock | |
211 | * | |
212 | * Receive data of size len in put that data into | |
213 | * the buf param. Using recvmsg API. | |
214 | * Return the size of received data. | |
215 | */ | |
216 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
217 | { | |
218 | struct msghdr msg; | |
219 | struct iovec iov[1]; | |
220 | ssize_t ret = -1; | |
221 | ||
222 | memset(&msg, 0, sizeof(msg)); | |
223 | ||
224 | iov[0].iov_base = buf; | |
225 | iov[0].iov_len = len; | |
226 | msg.msg_iov = iov; | |
227 | msg.msg_iovlen = 1; | |
228 | ||
229 | ret = recvmsg(sock, &msg, 0); | |
230 | if (ret < 0) { | |
231 | perror("recvmsg"); | |
232 | } | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
237 | /* | |
238 | * lttcomm_send_unix_sock | |
239 | * | |
240 | * Send buf data of size len. Using sendmsg API. | |
241 | * Return the size of sent data. | |
242 | */ | |
243 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
244 | { | |
245 | struct msghdr msg; | |
246 | struct iovec iov[1]; | |
247 | ssize_t ret = -1; | |
248 | ||
249 | memset(&msg, 0, sizeof(msg)); | |
250 | ||
251 | iov[0].iov_base = buf; | |
252 | iov[0].iov_len = len; | |
253 | msg.msg_iov = iov; | |
254 | msg.msg_iovlen = 1; | |
255 | ||
256 | ret = sendmsg(sock, &msg, 0); | |
257 | if (ret < 0) { | |
258 | perror("sendmsg"); | |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
87378cf5 DG |
263 | |
264 | /* | |
265 | * lttcomm_close_unix_sock | |
266 | * | |
267 | * Shutdown cleanly a unix socket. | |
268 | */ | |
269 | int lttcomm_close_unix_sock(int sock) | |
270 | { | |
271 | int ret; | |
272 | ||
273 | /* Shutdown receptions and transmissions */ | |
274 | ret = shutdown(sock, SHUT_RDWR); | |
275 | if (ret < 0) { | |
276 | perror("shutdown"); | |
277 | } | |
278 | ||
279 | return ret; | |
280 | } | |
8c0faa1d DG |
281 | |
282 | /* | |
283 | * lttcomm_send_fds_unix_sock | |
284 | * | |
285 | * Send multiple fds on a unix socket. | |
286 | */ | |
287 | ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, size_t len) | |
288 | { | |
289 | struct msghdr msg; | |
290 | struct cmsghdr *cmptr; | |
291 | struct iovec iov[1]; | |
292 | ssize_t ret = -1; | |
293 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
294 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
295 | ||
296 | memset(&msg, 0, sizeof(msg)); | |
297 | ||
298 | msg.msg_control = (caddr_t)tmp; | |
299 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
300 | ||
301 | cmptr = CMSG_FIRSTHDR(&msg); | |
302 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); | |
303 | cmptr->cmsg_level = SOL_SOCKET; | |
304 | cmptr->cmsg_type = SCM_RIGHTS; | |
305 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); | |
306 | ||
307 | iov[0].iov_base = buf; | |
308 | iov[0].iov_len = len; | |
309 | msg.msg_iov = iov; | |
310 | msg.msg_iovlen = 1; | |
311 | ||
312 | ret = sendmsg(sock, &msg, 0); | |
313 | if (ret < 0) { | |
314 | perror("sendmsg"); | |
315 | } | |
316 | ||
317 | return ret; | |
318 | } |