Add LTTNG_PACKED macro
[lttng-tools.git] / src / common / sessiond-comm / inet.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <limits.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27 #include <errno.h>
28
29 #include <common/defaults.h>
30 #include <common/error.h>
31
32 #include "inet.h"
33
34 /*
35 * INET protocol operations.
36 */
37 static const struct lttcomm_proto_ops inet_ops = {
38 .bind = lttcomm_bind_inet_sock,
39 .close = lttcomm_close_inet_sock,
40 .connect = lttcomm_connect_inet_sock,
41 .accept = lttcomm_accept_inet_sock,
42 .listen = lttcomm_listen_inet_sock,
43 .recvmsg = lttcomm_recvmsg_inet_sock,
44 .sendmsg = lttcomm_sendmsg_inet_sock,
45 };
46
47 /*
48 * Creates an PF_INET socket.
49 */
50 __attribute__((visibility("hidden")))
51 int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type, int proto)
52 {
53 int val = 1, ret;
54
55 /* Create server socket */
56 if ((sock->fd = socket(PF_INET, type, proto)) < 0) {
57 PERROR("socket inet");
58 goto error;
59 }
60
61 sock->ops = &inet_ops;
62
63 /*
64 * Set socket option to reuse the address.
65 */
66 ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int));
67 if (ret < 0) {
68 PERROR("setsockopt inet");
69 goto error;
70 }
71
72 return 0;
73
74 error:
75 return -1;
76 }
77
78 /*
79 * Bind socket and return.
80 */
81 __attribute__((visibility("hidden")))
82 int lttcomm_bind_inet_sock(struct lttcomm_sock *sock)
83 {
84 int ret;
85
86 ret = bind(sock->fd, &sock->sockaddr.addr.sin,
87 sizeof(sock->sockaddr.addr.sin));
88 if (ret < 0) {
89 PERROR("bind inet");
90 }
91
92 return ret;
93 }
94
95 /*
96 * Connect PF_INET socket.
97 */
98 __attribute__((visibility("hidden")))
99 int lttcomm_connect_inet_sock(struct lttcomm_sock *sock)
100 {
101 int ret, closeret;
102
103 ret = connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin,
104 sizeof(sock->sockaddr.addr.sin));
105 if (ret < 0) {
106 /*
107 * Don't print message on connect error, because connect is used in
108 * normal execution to detect if sessiond is alive.
109 */
110 goto error_connect;
111 }
112
113 return ret;
114
115 error_connect:
116 closeret = close(sock->fd);
117 if (closeret) {
118 PERROR("close inet");
119 }
120
121 return ret;
122 }
123
124 /*
125 * Do an accept(2) on the sock and return the new lttcomm socket. The socket
126 * MUST be bind(2) before.
127 */
128 __attribute__((visibility("hidden")))
129 struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock)
130 {
131 int new_fd;
132 socklen_t len;
133 struct lttcomm_sock *new_sock;
134
135 if (sock->proto == LTTCOMM_SOCK_UDP) {
136 /*
137 * accept(2) does not exist for UDP so simply return the passed socket.
138 */
139 new_sock = sock;
140 goto end;
141 }
142
143 new_sock = lttcomm_alloc_sock(sock->proto);
144 if (new_sock == NULL) {
145 goto error;
146 }
147
148 len = sizeof(new_sock->sockaddr.addr.sin);
149
150 /* Blocking call */
151 new_fd = accept(sock->fd, (struct sockaddr *) &new_sock->sockaddr.addr.sin,
152 &len);
153 if (new_fd < 0) {
154 PERROR("accept inet");
155 goto error;
156 }
157
158 new_sock->fd = new_fd;
159 new_sock->ops = &inet_ops;
160
161 end:
162 return new_sock;
163
164 error:
165 free(new_sock);
166 return NULL;
167 }
168
169 /*
170 * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
171 */
172 __attribute__((visibility("hidden")))
173 int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog)
174 {
175 int ret;
176
177 if (sock->proto == LTTCOMM_SOCK_UDP) {
178 /* listen(2) does not exist for UDP so simply return success. */
179 ret = 0;
180 goto end;
181 }
182
183 /* Default listen backlog */
184 if (backlog <= 0) {
185 backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN;
186 }
187
188 ret = listen(sock->fd, backlog);
189 if (ret < 0) {
190 PERROR("listen inet");
191 }
192
193 end:
194 return ret;
195 }
196
197 /*
198 * Receive data of size len in put that data into the buf param. Using recvmsg
199 * API.
200 *
201 * Return the size of received data.
202 */
203 __attribute__((visibility("hidden")))
204 ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
205 size_t len, int flags)
206 {
207 struct msghdr msg;
208 struct iovec iov[1];
209 ssize_t ret = -1;
210 size_t len_last;
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 msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin;
220 msg.msg_namelen = sizeof(sock->sockaddr.addr.sin);
221
222 do {
223 len_last = iov[0].iov_len;
224 ret = recvmsg(sock->fd, &msg, flags);
225 if (ret > 0) {
226 iov[0].iov_base += ret;
227 iov[0].iov_len -= ret;
228 assert(ret <= len_last);
229 }
230 } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
231 if (ret < 0) {
232 PERROR("recvmsg inet");
233 } else if (ret > 0) {
234 ret = len;
235 }
236 /* Else ret = 0 meaning an orderly shutdown. */
237
238 return ret;
239 }
240
241 /*
242 * Send buf data of size len. Using sendmsg API.
243 *
244 * Return the size of sent data.
245 */
246 __attribute__((visibility("hidden")))
247 ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
248 size_t len, int flags)
249 {
250 struct msghdr msg;
251 struct iovec iov[1];
252 ssize_t ret = -1;
253
254 memset(&msg, 0, sizeof(msg));
255
256 iov[0].iov_base = buf;
257 iov[0].iov_len = len;
258 msg.msg_iov = iov;
259 msg.msg_iovlen = 1;
260
261 switch (sock->proto) {
262 case LTTCOMM_SOCK_UDP:
263 msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin;
264 msg.msg_namelen = sizeof(sock->sockaddr.addr.sin);
265 break;
266 default:
267 break;
268 }
269
270 do {
271 ret = sendmsg(sock->fd, &msg, flags);
272 } while (ret < 0 && errno == EINTR);
273 if (ret < 0) {
274 /*
275 * Only warn about EPIPE when quiet mode is deactivated.
276 * We consider EPIPE as expected.
277 */
278 if (errno != EPIPE || !lttng_opt_quiet) {
279 PERROR("sendmsg inet");
280 }
281 }
282
283 return ret;
284 }
285
286 /*
287 * Shutdown cleanly and close.
288 */
289 __attribute__((visibility("hidden")))
290 int lttcomm_close_inet_sock(struct lttcomm_sock *sock)
291 {
292 int ret;
293
294 /* Don't try to close an invalid marked socket */
295 if (sock->fd == -1) {
296 return 0;
297 }
298
299 ret = close(sock->fd);
300 if (ret) {
301 PERROR("close inet");
302 }
303
304 /* Mark socket */
305 sock->fd = -1;
306
307 return ret;
308 }
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