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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", |
ca95a216 | 43 | [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon", |
fac6795d DG |
44 | }; |
45 | ||
46 | /* | |
47 | * lttcom_get_readable_code | |
48 | * | |
49 | * Return ptr to string representing a human readable | |
50 | * error code from the lttcomm_return_code enum. | |
51 | * | |
52 | * These code MUST be negative in other to treat that | |
53 | * as an error value. | |
54 | */ | |
55 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
56 | { | |
57 | int tmp_code = -code; | |
58 | ||
59 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
60 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
61 | } | |
62 | ||
63 | return "Unknown error code"; | |
64 | } | |
65 | ||
66 | /* | |
67 | * lttcomm_connect_unix_sock | |
68 | * | |
69 | * Connect to unix socket using the path name. | |
70 | */ | |
71 | int lttcomm_connect_unix_sock(const char *pathname) | |
72 | { | |
686204ab MD |
73 | struct sockaddr_un sun; |
74 | int fd; | |
fac6795d DG |
75 | int ret = 1; |
76 | ||
686204ab | 77 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d DG |
78 | if (fd < 0) { |
79 | perror("socket"); | |
80 | goto error; | |
81 | } | |
82 | ||
686204ab MD |
83 | memset(&sun, 0, sizeof(sun)); |
84 | sun.sun_family = AF_UNIX; | |
85 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
fac6795d | 86 | |
686204ab MD |
87 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
88 | if (ret < 0) { | |
89 | perror("connect"); | |
fac6795d | 90 | goto error; |
686204ab | 91 | } |
fac6795d | 92 | |
686204ab | 93 | return fd; |
fac6795d DG |
94 | |
95 | error: | |
96 | return -1; | |
97 | } | |
98 | ||
99 | /* | |
100 | * lttcomm_accept_unix_sock | |
101 | * | |
102 | * Do an accept(2) on the sock and return the | |
103 | * new file descriptor. The socket MUST be bind(2) before. | |
104 | */ | |
105 | int lttcomm_accept_unix_sock(int sock) | |
106 | { | |
107 | int new_fd; | |
108 | struct sockaddr_un sun; | |
109 | socklen_t len = 0; | |
110 | ||
111 | /* Blocking call */ | |
112 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
113 | if (new_fd < 0) { | |
114 | perror("accept"); | |
115 | goto error; | |
116 | } | |
117 | ||
118 | return new_fd; | |
119 | ||
120 | error: | |
121 | return -1; | |
122 | } | |
123 | ||
124 | /* | |
125 | * lttcomm_create_unix_sock | |
126 | * | |
127 | * Creates a AF_UNIX local socket using pathname | |
128 | * bind the socket upon creation and return the fd. | |
129 | */ | |
130 | int lttcomm_create_unix_sock(const char *pathname) | |
131 | { | |
132 | struct sockaddr_un sun; | |
133 | int fd; | |
134 | int ret = -1; | |
135 | ||
136 | /* Create server socket */ | |
137 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
138 | perror("socket"); | |
139 | goto error; | |
140 | } | |
141 | ||
142 | memset(&sun, 0, sizeof(sun)); | |
143 | sun.sun_family = AF_UNIX; | |
144 | strncpy(sun.sun_path, pathname, strlen(pathname)); | |
145 | ||
146 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); | |
147 | if (ret < 0) { | |
148 | perror("bind"); | |
149 | goto error; | |
150 | } | |
151 | ||
152 | return fd; | |
153 | ||
154 | error: | |
155 | return ret; | |
156 | } | |
157 | ||
158 | /* | |
159 | * lttcomm_listen_unix_sock | |
160 | * | |
161 | * Make the socket listen using MAX_LISTEN. | |
162 | */ | |
163 | int lttcomm_listen_unix_sock(int sock) | |
164 | { | |
165 | int ret; | |
166 | ||
167 | ret = listen(sock, MAX_LISTEN); | |
168 | if (ret < 0) { | |
169 | perror("listen"); | |
170 | } | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | /* | |
176 | * lttcomm_recv_unix_sock | |
177 | * | |
178 | * Receive data of size len in put that data into | |
179 | * the buf param. Using recvmsg API. | |
180 | * Return the size of received data. | |
181 | */ | |
182 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
183 | { | |
184 | struct msghdr msg; | |
185 | struct iovec iov[1]; | |
186 | ssize_t ret = -1; | |
187 | ||
188 | memset(&msg, 0, sizeof(msg)); | |
189 | ||
190 | iov[0].iov_base = buf; | |
191 | iov[0].iov_len = len; | |
192 | msg.msg_iov = iov; | |
193 | msg.msg_iovlen = 1; | |
194 | ||
195 | ret = recvmsg(sock, &msg, 0); | |
196 | if (ret < 0) { | |
197 | perror("recvmsg"); | |
198 | } | |
199 | ||
200 | return ret; | |
201 | } | |
202 | ||
203 | /* | |
204 | * lttcomm_send_unix_sock | |
205 | * | |
206 | * Send buf data of size len. Using sendmsg API. | |
207 | * Return the size of sent data. | |
208 | */ | |
209 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
210 | { | |
211 | struct msghdr msg; | |
212 | struct iovec iov[1]; | |
213 | ssize_t ret = -1; | |
214 | ||
215 | memset(&msg, 0, sizeof(msg)); | |
216 | ||
217 | iov[0].iov_base = buf; | |
218 | iov[0].iov_len = len; | |
219 | msg.msg_iov = iov; | |
220 | msg.msg_iovlen = 1; | |
221 | ||
222 | ret = sendmsg(sock, &msg, 0); | |
223 | if (ret < 0) { | |
224 | perror("sendmsg"); | |
225 | } | |
226 | ||
227 | return ret; | |
228 | } | |
87378cf5 DG |
229 | |
230 | /* | |
231 | * lttcomm_close_unix_sock | |
232 | * | |
233 | * Shutdown cleanly a unix socket. | |
234 | */ | |
235 | int lttcomm_close_unix_sock(int sock) | |
236 | { | |
237 | int ret; | |
238 | ||
239 | /* Shutdown receptions and transmissions */ | |
240 | ret = shutdown(sock, SHUT_RDWR); | |
241 | if (ret < 0) { | |
242 | perror("shutdown"); | |
243 | } | |
244 | ||
245 | return ret; | |
246 | } |