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", | |
d4a1283e JD |
54 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready", |
55 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds", | |
56 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds", | |
57 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread", | |
58 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd", | |
59 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up", | |
60 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally", | |
61 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error", | |
62 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile", | |
0632499a JD |
63 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF", |
64 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL", | |
65 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM", | |
66 | [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE", | |
894be886 | 67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "No event found", |
fac6795d DG |
68 | }; |
69 | ||
70 | /* | |
71 | * lttcom_get_readable_code | |
72 | * | |
73 | * Return ptr to string representing a human readable | |
74 | * error code from the lttcomm_return_code enum. | |
75 | * | |
76 | * These code MUST be negative in other to treat that | |
77 | * as an error value. | |
78 | */ | |
79 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
80 | { | |
81 | int tmp_code = -code; | |
82 | ||
83 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
84 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
85 | } | |
86 | ||
87 | return "Unknown error code"; | |
88 | } | |
89 | ||
90 | /* | |
91 | * lttcomm_connect_unix_sock | |
92 | * | |
93 | * Connect to unix socket using the path name. | |
94 | */ | |
95 | int lttcomm_connect_unix_sock(const char *pathname) | |
96 | { | |
686204ab MD |
97 | struct sockaddr_un sun; |
98 | int fd; | |
fac6795d DG |
99 | int ret = 1; |
100 | ||
686204ab | 101 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d DG |
102 | if (fd < 0) { |
103 | perror("socket"); | |
104 | goto error; | |
105 | } | |
106 | ||
686204ab MD |
107 | memset(&sun, 0, sizeof(sun)); |
108 | sun.sun_family = AF_UNIX; | |
109 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
fac6795d | 110 | |
686204ab MD |
111 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
112 | if (ret < 0) { | |
113 | perror("connect"); | |
fac6795d | 114 | goto error; |
686204ab | 115 | } |
fac6795d | 116 | |
686204ab | 117 | return fd; |
fac6795d DG |
118 | |
119 | error: | |
120 | return -1; | |
121 | } | |
122 | ||
123 | /* | |
124 | * lttcomm_accept_unix_sock | |
125 | * | |
126 | * Do an accept(2) on the sock and return the | |
127 | * new file descriptor. The socket MUST be bind(2) before. | |
128 | */ | |
129 | int lttcomm_accept_unix_sock(int sock) | |
130 | { | |
131 | int new_fd; | |
132 | struct sockaddr_un sun; | |
133 | socklen_t len = 0; | |
134 | ||
135 | /* Blocking call */ | |
136 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
137 | if (new_fd < 0) { | |
138 | perror("accept"); | |
139 | goto error; | |
140 | } | |
141 | ||
142 | return new_fd; | |
143 | ||
144 | error: | |
145 | return -1; | |
146 | } | |
147 | ||
148 | /* | |
149 | * lttcomm_create_unix_sock | |
150 | * | |
151 | * Creates a AF_UNIX local socket using pathname | |
152 | * bind the socket upon creation and return the fd. | |
153 | */ | |
154 | int lttcomm_create_unix_sock(const char *pathname) | |
155 | { | |
156 | struct sockaddr_un sun; | |
157 | int fd; | |
158 | int ret = -1; | |
159 | ||
160 | /* Create server socket */ | |
161 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
162 | perror("socket"); | |
163 | goto error; | |
164 | } | |
165 | ||
166 | memset(&sun, 0, sizeof(sun)); | |
167 | sun.sun_family = AF_UNIX; | |
168 | strncpy(sun.sun_path, pathname, strlen(pathname)); | |
169 | ||
170 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); | |
171 | if (ret < 0) { | |
172 | perror("bind"); | |
173 | goto error; | |
174 | } | |
175 | ||
176 | return fd; | |
177 | ||
178 | error: | |
179 | return ret; | |
180 | } | |
181 | ||
182 | /* | |
183 | * lttcomm_listen_unix_sock | |
184 | * | |
185 | * Make the socket listen using MAX_LISTEN. | |
186 | */ | |
187 | int lttcomm_listen_unix_sock(int sock) | |
188 | { | |
189 | int ret; | |
190 | ||
191 | ret = listen(sock, MAX_LISTEN); | |
192 | if (ret < 0) { | |
193 | perror("listen"); | |
194 | } | |
195 | ||
196 | return ret; | |
197 | } | |
198 | ||
199 | /* | |
200 | * lttcomm_recv_unix_sock | |
201 | * | |
202 | * Receive data of size len in put that data into | |
203 | * the buf param. Using recvmsg API. | |
204 | * Return the size of received data. | |
205 | */ | |
206 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
207 | { | |
208 | struct msghdr msg; | |
209 | struct iovec iov[1]; | |
210 | ssize_t ret = -1; | |
211 | ||
212 | memset(&msg, 0, sizeof(msg)); | |
213 | ||
214 | iov[0].iov_base = buf; | |
215 | iov[0].iov_len = len; | |
216 | msg.msg_iov = iov; | |
217 | msg.msg_iovlen = 1; | |
218 | ||
219 | ret = recvmsg(sock, &msg, 0); | |
220 | if (ret < 0) { | |
221 | perror("recvmsg"); | |
222 | } | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
227 | /* | |
228 | * lttcomm_send_unix_sock | |
229 | * | |
230 | * Send buf data of size len. Using sendmsg API. | |
231 | * Return the size of sent data. | |
232 | */ | |
233 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
234 | { | |
235 | struct msghdr msg; | |
236 | struct iovec iov[1]; | |
237 | ssize_t ret = -1; | |
238 | ||
239 | memset(&msg, 0, sizeof(msg)); | |
240 | ||
241 | iov[0].iov_base = buf; | |
242 | iov[0].iov_len = len; | |
243 | msg.msg_iov = iov; | |
244 | msg.msg_iovlen = 1; | |
245 | ||
246 | ret = sendmsg(sock, &msg, 0); | |
247 | if (ret < 0) { | |
248 | perror("sendmsg"); | |
249 | } | |
250 | ||
251 | return ret; | |
252 | } | |
87378cf5 DG |
253 | |
254 | /* | |
255 | * lttcomm_close_unix_sock | |
256 | * | |
257 | * Shutdown cleanly a unix socket. | |
258 | */ | |
259 | int lttcomm_close_unix_sock(int sock) | |
260 | { | |
261 | int ret; | |
262 | ||
263 | /* Shutdown receptions and transmissions */ | |
264 | ret = shutdown(sock, SHUT_RDWR); | |
265 | if (ret < 0) { | |
266 | perror("shutdown"); | |
267 | } | |
268 | ||
269 | return ret; | |
270 | } |