Commit | Line | Data |
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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 | ||
90e535ef | 29 | #include <common/common.h> |
6364a07a DG |
30 | |
31 | #include "inet.h" | |
32 | ||
33 | /* | |
34 | * INET protocol operations. | |
35 | */ | |
36 | static const struct lttcomm_proto_ops inet_ops = { | |
37 | .bind = lttcomm_bind_inet_sock, | |
38 | .close = lttcomm_close_inet_sock, | |
39 | .connect = lttcomm_connect_inet_sock, | |
40 | .accept = lttcomm_accept_inet_sock, | |
41 | .listen = lttcomm_listen_inet_sock, | |
42 | .recvmsg = lttcomm_recvmsg_inet_sock, | |
43 | .sendmsg = lttcomm_sendmsg_inet_sock, | |
44 | }; | |
45 | ||
46 | /* | |
47 | * Creates an PF_INET socket. | |
48 | */ | |
90e535ef | 49 | LTTNG_HIDDEN |
6364a07a DG |
50 | int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type, int proto) |
51 | { | |
de5e9086 | 52 | int val = 1, ret; |
6364a07a DG |
53 | |
54 | /* Create server socket */ | |
55 | if ((sock->fd = socket(PF_INET, type, proto)) < 0) { | |
56 | PERROR("socket inet"); | |
57 | goto error; | |
58 | } | |
59 | ||
60 | sock->ops = &inet_ops; | |
61 | ||
62 | /* | |
63 | * Set socket option to reuse the address. | |
64 | */ | |
65 | ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int)); | |
66 | if (ret < 0) { | |
67 | PERROR("setsockopt inet"); | |
68 | goto error; | |
69 | } | |
70 | ||
71 | return 0; | |
72 | ||
73 | error: | |
74 | return -1; | |
75 | } | |
76 | ||
77 | /* | |
78 | * Bind socket and return. | |
79 | */ | |
90e535ef | 80 | LTTNG_HIDDEN |
6364a07a DG |
81 | int lttcomm_bind_inet_sock(struct lttcomm_sock *sock) |
82 | { | |
83 | int ret; | |
84 | ||
85 | ret = bind(sock->fd, &sock->sockaddr.addr.sin, | |
86 | sizeof(sock->sockaddr.addr.sin)); | |
87 | if (ret < 0) { | |
88 | PERROR("bind inet"); | |
89 | } | |
90 | ||
91 | return ret; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Connect PF_INET socket. | |
96 | */ | |
90e535ef | 97 | LTTNG_HIDDEN |
6364a07a DG |
98 | int lttcomm_connect_inet_sock(struct lttcomm_sock *sock) |
99 | { | |
100 | int ret, closeret; | |
101 | ||
102 | ret = connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin, | |
103 | sizeof(sock->sockaddr.addr.sin)); | |
104 | if (ret < 0) { | |
69e52df1 | 105 | PERROR("connect"); |
6364a07a DG |
106 | goto error_connect; |
107 | } | |
108 | ||
109 | return ret; | |
110 | ||
111 | error_connect: | |
112 | closeret = close(sock->fd); | |
113 | if (closeret) { | |
114 | PERROR("close inet"); | |
115 | } | |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
122 | * MUST be bind(2) before. | |
123 | */ | |
90e535ef | 124 | LTTNG_HIDDEN |
6364a07a DG |
125 | struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock) |
126 | { | |
127 | int new_fd; | |
88a5db70 | 128 | socklen_t len; |
6364a07a DG |
129 | struct lttcomm_sock *new_sock; |
130 | ||
131 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
132 | /* | |
133 | * accept(2) does not exist for UDP so simply return the passed socket. | |
134 | */ | |
135 | new_sock = sock; | |
136 | goto end; | |
137 | } | |
138 | ||
de5e9086 | 139 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
140 | if (new_sock == NULL) { |
141 | goto error; | |
142 | } | |
143 | ||
88a5db70 DG |
144 | len = sizeof(new_sock->sockaddr.addr.sin); |
145 | ||
6364a07a DG |
146 | /* Blocking call */ |
147 | new_fd = accept(sock->fd, (struct sockaddr *) &new_sock->sockaddr.addr.sin, | |
148 | &len); | |
149 | if (new_fd < 0) { | |
150 | PERROR("accept inet"); | |
151 | goto error; | |
152 | } | |
153 | ||
154 | new_sock->fd = new_fd; | |
de5e9086 | 155 | new_sock->ops = &inet_ops; |
6364a07a DG |
156 | |
157 | end: | |
158 | return new_sock; | |
159 | ||
160 | error: | |
161 | free(new_sock); | |
162 | return NULL; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
167 | */ | |
90e535ef | 168 | LTTNG_HIDDEN |
6364a07a DG |
169 | int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog) |
170 | { | |
171 | int ret; | |
172 | ||
173 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
174 | /* listen(2) does not exist for UDP so simply return success. */ | |
175 | ret = 0; | |
176 | goto end; | |
177 | } | |
178 | ||
179 | /* Default listen backlog */ | |
180 | if (backlog <= 0) { | |
181 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
182 | } | |
183 | ||
184 | ret = listen(sock->fd, backlog); | |
185 | if (ret < 0) { | |
186 | PERROR("listen inet"); | |
187 | } | |
188 | ||
189 | end: | |
190 | return ret; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
195 | * API. | |
196 | * | |
197 | * Return the size of received data. | |
198 | */ | |
90e535ef | 199 | LTTNG_HIDDEN |
6364a07a DG |
200 | ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf, |
201 | size_t len, int flags) | |
202 | { | |
203 | struct msghdr msg; | |
204 | struct iovec iov[1]; | |
205 | ssize_t ret = -1; | |
7c5aef62 | 206 | size_t len_last; |
6364a07a DG |
207 | |
208 | memset(&msg, 0, sizeof(msg)); | |
209 | ||
210 | iov[0].iov_base = buf; | |
211 | iov[0].iov_len = len; | |
212 | msg.msg_iov = iov; | |
213 | msg.msg_iovlen = 1; | |
214 | ||
215 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin; | |
216 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin); | |
217 | ||
6364a07a | 218 | do { |
7c5aef62 | 219 | len_last = iov[0].iov_len; |
6364a07a | 220 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 DG |
221 | if (ret > 0) { |
222 | iov[0].iov_base += ret; | |
223 | iov[0].iov_len -= ret; | |
224 | assert(ret <= len_last); | |
225 | } | |
226 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
6364a07a DG |
227 | if (ret < 0) { |
228 | PERROR("recvmsg inet"); | |
7c5aef62 DG |
229 | } else if (ret > 0) { |
230 | ret = len; | |
6364a07a | 231 | } |
7c5aef62 | 232 | /* Else ret = 0 meaning an orderly shutdown. */ |
6364a07a DG |
233 | |
234 | return ret; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Send buf data of size len. Using sendmsg API. | |
239 | * | |
240 | * Return the size of sent data. | |
241 | */ | |
90e535ef | 242 | LTTNG_HIDDEN |
6364a07a DG |
243 | ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, void *buf, |
244 | size_t len, int flags) | |
245 | { | |
246 | struct msghdr msg; | |
247 | struct iovec iov[1]; | |
248 | ssize_t ret = -1; | |
249 | ||
250 | memset(&msg, 0, sizeof(msg)); | |
251 | ||
252 | iov[0].iov_base = buf; | |
253 | iov[0].iov_len = len; | |
254 | msg.msg_iov = iov; | |
255 | msg.msg_iovlen = 1; | |
256 | ||
257 | switch (sock->proto) { | |
258 | case LTTCOMM_SOCK_UDP: | |
259 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin; | |
260 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin); | |
261 | break; | |
262 | default: | |
263 | break; | |
264 | } | |
265 | ||
266 | do { | |
267 | ret = sendmsg(sock->fd, &msg, flags); | |
268 | } while (ret < 0 && errno == EINTR); | |
269 | if (ret < 0) { | |
270 | /* | |
271 | * Only warn about EPIPE when quiet mode is deactivated. | |
272 | * We consider EPIPE as expected. | |
273 | */ | |
274 | if (errno != EPIPE || !lttng_opt_quiet) { | |
275 | PERROR("sendmsg inet"); | |
276 | } | |
277 | } | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Shutdown cleanly and close. | |
284 | */ | |
90e535ef | 285 | LTTNG_HIDDEN |
6364a07a DG |
286 | int lttcomm_close_inet_sock(struct lttcomm_sock *sock) |
287 | { | |
6e742359 | 288 | int ret; |
6364a07a | 289 | |
de5e9086 | 290 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
291 | if (sock->fd == -1) { |
292 | return 0; | |
293 | } | |
294 | ||
6e742359 DG |
295 | ret = close(sock->fd); |
296 | if (ret) { | |
6364a07a DG |
297 | PERROR("close inet"); |
298 | } | |
299 | ||
300 | /* Mark socket */ | |
301 | sock->fd = -1; | |
302 | ||
303 | return ret; | |
304 | } |