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 DG |
46 | [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed", |
47 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable", | |
48 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected", | |
27673bb6 | 49 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist", |
fac6795d DG |
50 | }; |
51 | ||
52 | /* | |
53 | * lttcom_get_readable_code | |
54 | * | |
55 | * Return ptr to string representing a human readable | |
56 | * error code from the lttcomm_return_code enum. | |
57 | * | |
58 | * These code MUST be negative in other to treat that | |
59 | * as an error value. | |
60 | */ | |
61 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
62 | { | |
63 | int tmp_code = -code; | |
64 | ||
65 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
66 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
67 | } | |
68 | ||
69 | return "Unknown error code"; | |
70 | } | |
71 | ||
72 | /* | |
73 | * lttcomm_connect_unix_sock | |
74 | * | |
75 | * Connect to unix socket using the path name. | |
76 | */ | |
77 | int lttcomm_connect_unix_sock(const char *pathname) | |
78 | { | |
686204ab MD |
79 | struct sockaddr_un sun; |
80 | int fd; | |
fac6795d DG |
81 | int ret = 1; |
82 | ||
686204ab | 83 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d DG |
84 | if (fd < 0) { |
85 | perror("socket"); | |
86 | goto error; | |
87 | } | |
88 | ||
686204ab MD |
89 | memset(&sun, 0, sizeof(sun)); |
90 | sun.sun_family = AF_UNIX; | |
91 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
fac6795d | 92 | |
686204ab MD |
93 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
94 | if (ret < 0) { | |
95 | perror("connect"); | |
fac6795d | 96 | goto error; |
686204ab | 97 | } |
fac6795d | 98 | |
686204ab | 99 | return fd; |
fac6795d DG |
100 | |
101 | error: | |
102 | return -1; | |
103 | } | |
104 | ||
105 | /* | |
106 | * lttcomm_accept_unix_sock | |
107 | * | |
108 | * Do an accept(2) on the sock and return the | |
109 | * new file descriptor. The socket MUST be bind(2) before. | |
110 | */ | |
111 | int lttcomm_accept_unix_sock(int sock) | |
112 | { | |
113 | int new_fd; | |
114 | struct sockaddr_un sun; | |
115 | socklen_t len = 0; | |
116 | ||
117 | /* Blocking call */ | |
118 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
119 | if (new_fd < 0) { | |
120 | perror("accept"); | |
121 | goto error; | |
122 | } | |
123 | ||
124 | return new_fd; | |
125 | ||
126 | error: | |
127 | return -1; | |
128 | } | |
129 | ||
130 | /* | |
131 | * lttcomm_create_unix_sock | |
132 | * | |
133 | * Creates a AF_UNIX local socket using pathname | |
134 | * bind the socket upon creation and return the fd. | |
135 | */ | |
136 | int lttcomm_create_unix_sock(const char *pathname) | |
137 | { | |
138 | struct sockaddr_un sun; | |
139 | int fd; | |
140 | int ret = -1; | |
141 | ||
142 | /* Create server socket */ | |
143 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
144 | perror("socket"); | |
145 | goto error; | |
146 | } | |
147 | ||
148 | memset(&sun, 0, sizeof(sun)); | |
149 | sun.sun_family = AF_UNIX; | |
150 | strncpy(sun.sun_path, pathname, strlen(pathname)); | |
151 | ||
152 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); | |
153 | if (ret < 0) { | |
154 | perror("bind"); | |
155 | goto error; | |
156 | } | |
157 | ||
158 | return fd; | |
159 | ||
160 | error: | |
161 | return ret; | |
162 | } | |
163 | ||
164 | /* | |
165 | * lttcomm_listen_unix_sock | |
166 | * | |
167 | * Make the socket listen using MAX_LISTEN. | |
168 | */ | |
169 | int lttcomm_listen_unix_sock(int sock) | |
170 | { | |
171 | int ret; | |
172 | ||
173 | ret = listen(sock, MAX_LISTEN); | |
174 | if (ret < 0) { | |
175 | perror("listen"); | |
176 | } | |
177 | ||
178 | return ret; | |
179 | } | |
180 | ||
181 | /* | |
182 | * lttcomm_recv_unix_sock | |
183 | * | |
184 | * Receive data of size len in put that data into | |
185 | * the buf param. Using recvmsg API. | |
186 | * Return the size of received data. | |
187 | */ | |
188 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
189 | { | |
190 | struct msghdr msg; | |
191 | struct iovec iov[1]; | |
192 | ssize_t ret = -1; | |
193 | ||
194 | memset(&msg, 0, sizeof(msg)); | |
195 | ||
196 | iov[0].iov_base = buf; | |
197 | iov[0].iov_len = len; | |
198 | msg.msg_iov = iov; | |
199 | msg.msg_iovlen = 1; | |
200 | ||
201 | ret = recvmsg(sock, &msg, 0); | |
202 | if (ret < 0) { | |
203 | perror("recvmsg"); | |
204 | } | |
205 | ||
206 | return ret; | |
207 | } | |
208 | ||
209 | /* | |
210 | * lttcomm_send_unix_sock | |
211 | * | |
212 | * Send buf data of size len. Using sendmsg API. | |
213 | * Return the size of sent data. | |
214 | */ | |
215 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
216 | { | |
217 | struct msghdr msg; | |
218 | struct iovec iov[1]; | |
219 | ssize_t ret = -1; | |
220 | ||
221 | memset(&msg, 0, sizeof(msg)); | |
222 | ||
223 | iov[0].iov_base = buf; | |
224 | iov[0].iov_len = len; | |
225 | msg.msg_iov = iov; | |
226 | msg.msg_iovlen = 1; | |
227 | ||
228 | ret = sendmsg(sock, &msg, 0); | |
229 | if (ret < 0) { | |
230 | perror("sendmsg"); | |
231 | } | |
232 | ||
233 | return ret; | |
234 | } | |
87378cf5 DG |
235 | |
236 | /* | |
237 | * lttcomm_close_unix_sock | |
238 | * | |
239 | * Shutdown cleanly a unix socket. | |
240 | */ | |
241 | int lttcomm_close_unix_sock(int sock) | |
242 | { | |
243 | int ret; | |
244 | ||
245 | /* Shutdown receptions and transmissions */ | |
246 | ret = shutdown(sock, SHUT_RDWR); | |
247 | if (ret < 0) { | |
248 | perror("shutdown"); | |
249 | } | |
250 | ||
251 | return ret; | |
252 | } |