Commit | Line | Data |
---|---|---|
6364a07a DG |
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 | */ | |
32dd26fb | 50 | __attribute__((visibility("hidden"))) |
6364a07a DG |
51 | int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type, int proto) |
52 | { | |
de5e9086 | 53 | int val = 1, ret; |
6364a07a DG |
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 | */ | |
32dd26fb | 81 | __attribute__((visibility("hidden"))) |
6364a07a DG |
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 | */ | |
32dd26fb | 98 | __attribute__((visibility("hidden"))) |
6364a07a DG |
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 | */ | |
32dd26fb | 128 | __attribute__((visibility("hidden"))) |
6364a07a DG |
129 | struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock) |
130 | { | |
131 | int new_fd; | |
132 | socklen_t len = 0; | |
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 | ||
de5e9086 | 143 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
144 | if (new_sock == NULL) { |
145 | goto error; | |
146 | } | |
147 | ||
148 | /* Blocking call */ | |
149 | new_fd = accept(sock->fd, (struct sockaddr *) &new_sock->sockaddr.addr.sin, | |
150 | &len); | |
151 | if (new_fd < 0) { | |
152 | PERROR("accept inet"); | |
153 | goto error; | |
154 | } | |
155 | ||
156 | new_sock->fd = new_fd; | |
de5e9086 | 157 | new_sock->ops = &inet_ops; |
6364a07a DG |
158 | |
159 | end: | |
160 | return new_sock; | |
161 | ||
162 | error: | |
163 | free(new_sock); | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | /* | |
168 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
169 | */ | |
32dd26fb | 170 | __attribute__((visibility("hidden"))) |
6364a07a DG |
171 | int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog) |
172 | { | |
173 | int ret; | |
174 | ||
175 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
176 | /* listen(2) does not exist for UDP so simply return success. */ | |
177 | ret = 0; | |
178 | goto end; | |
179 | } | |
180 | ||
181 | /* Default listen backlog */ | |
182 | if (backlog <= 0) { | |
183 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
184 | } | |
185 | ||
186 | ret = listen(sock->fd, backlog); | |
187 | if (ret < 0) { | |
188 | PERROR("listen inet"); | |
189 | } | |
190 | ||
191 | end: | |
192 | return ret; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
197 | * API. | |
198 | * | |
199 | * Return the size of received data. | |
200 | */ | |
32dd26fb | 201 | __attribute__((visibility("hidden"))) |
6364a07a DG |
202 | ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf, |
203 | size_t len, int flags) | |
204 | { | |
205 | struct msghdr msg; | |
206 | struct iovec iov[1]; | |
207 | ssize_t ret = -1; | |
208 | ||
209 | memset(&msg, 0, sizeof(msg)); | |
210 | ||
211 | iov[0].iov_base = buf; | |
212 | iov[0].iov_len = len; | |
213 | msg.msg_iov = iov; | |
214 | msg.msg_iovlen = 1; | |
215 | ||
216 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin; | |
217 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin); | |
218 | ||
219 | if (flags == 0) { | |
220 | flags = MSG_WAITALL; | |
221 | } | |
222 | ||
223 | do { | |
224 | ret = recvmsg(sock->fd, &msg, flags); | |
225 | } while (ret < 0 && errno == EINTR); | |
226 | if (ret < 0) { | |
227 | PERROR("recvmsg inet"); | |
228 | } | |
229 | ||
230 | return ret; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Send buf data of size len. Using sendmsg API. | |
235 | * | |
236 | * Return the size of sent data. | |
237 | */ | |
32dd26fb | 238 | __attribute__((visibility("hidden"))) |
6364a07a DG |
239 | ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, void *buf, |
240 | size_t len, int flags) | |
241 | { | |
242 | struct msghdr msg; | |
243 | struct iovec iov[1]; | |
244 | ssize_t ret = -1; | |
245 | ||
246 | memset(&msg, 0, sizeof(msg)); | |
247 | ||
248 | iov[0].iov_base = buf; | |
249 | iov[0].iov_len = len; | |
250 | msg.msg_iov = iov; | |
251 | msg.msg_iovlen = 1; | |
252 | ||
253 | switch (sock->proto) { | |
254 | case LTTCOMM_SOCK_UDP: | |
255 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin; | |
256 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin); | |
257 | break; | |
258 | default: | |
259 | break; | |
260 | } | |
261 | ||
262 | do { | |
263 | ret = sendmsg(sock->fd, &msg, flags); | |
264 | } while (ret < 0 && errno == EINTR); | |
265 | if (ret < 0) { | |
266 | /* | |
267 | * Only warn about EPIPE when quiet mode is deactivated. | |
268 | * We consider EPIPE as expected. | |
269 | */ | |
270 | if (errno != EPIPE || !lttng_opt_quiet) { | |
271 | PERROR("sendmsg inet"); | |
272 | } | |
273 | } | |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Shutdown cleanly and close. | |
280 | */ | |
32dd26fb | 281 | __attribute__((visibility("hidden"))) |
6364a07a DG |
282 | int lttcomm_close_inet_sock(struct lttcomm_sock *sock) |
283 | { | |
6e742359 | 284 | int ret; |
6364a07a | 285 | |
de5e9086 | 286 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
287 | if (sock->fd == -1) { |
288 | return 0; | |
289 | } | |
290 | ||
6e742359 DG |
291 | ret = close(sock->fd); |
292 | if (ret) { | |
6364a07a DG |
293 | PERROR("close inet"); |
294 | } | |
295 | ||
296 | /* Mark socket */ | |
297 | sock->fd = -1; | |
298 | ||
299 | return ret; | |
300 | } |