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 | ||
29 | #include <common/defaults.h> | |
30 | #include <common/error.h> | |
31 | ||
32 | #include "inet6.h" | |
33 | ||
34 | /* | |
35 | * INET protocol operations. | |
36 | */ | |
37 | static const struct lttcomm_proto_ops inet6_ops = { | |
38 | .bind = lttcomm_bind_inet6_sock, | |
39 | .close = lttcomm_close_inet6_sock, | |
40 | .connect = lttcomm_connect_inet6_sock, | |
41 | .accept = lttcomm_accept_inet6_sock, | |
42 | .listen = lttcomm_listen_inet6_sock, | |
43 | .recvmsg = lttcomm_recvmsg_inet6_sock, | |
44 | .sendmsg = lttcomm_sendmsg_inet6_sock, | |
45 | }; | |
46 | ||
47 | /* | |
48 | * Creates an PF_INET socket. | |
49 | */ | |
50 | int lttcomm_create_inet6_sock(struct lttcomm_sock *sock, int type, int proto) | |
51 | { | |
52 | int val, ret; | |
53 | ||
54 | /* Create server socket */ | |
55 | if ((sock->fd = socket(PF_INET, type, proto)) < 0) { | |
56 | PERROR("socket inet6"); | |
57 | goto error; | |
58 | } | |
59 | ||
60 | sock->ops = &inet6_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 inet6"); | |
68 | goto error; | |
69 | } | |
70 | ||
71 | return 0; | |
72 | ||
73 | error: | |
74 | return -1; | |
75 | } | |
76 | ||
77 | /* | |
78 | * Bind socket and return. | |
79 | */ | |
80 | int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock) | |
81 | { | |
82 | int ret; | |
83 | ||
84 | ret = bind(sock->fd, &sock->sockaddr.addr.sin6, | |
85 | sizeof(sock->sockaddr.addr.sin6)); | |
86 | if (ret < 0) { | |
87 | PERROR("bind inet6"); | |
88 | } | |
89 | ||
90 | return ret; | |
91 | } | |
92 | ||
93 | /* | |
94 | * Connect PF_INET socket. | |
95 | */ | |
96 | int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock) | |
97 | { | |
98 | int ret, closeret; | |
99 | ||
100 | ret = connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin6, | |
101 | sizeof(sock->sockaddr.addr.sin6)); | |
102 | if (ret < 0) { | |
103 | /* | |
104 | * Don't print message on connect error, because connect is used in | |
105 | * normal execution to detect if sessiond is alive. | |
106 | */ | |
107 | goto error_connect; | |
108 | } | |
109 | ||
110 | return ret; | |
111 | ||
112 | error_connect: | |
113 | closeret = close(sock->fd); | |
114 | if (closeret) { | |
115 | PERROR("close inet6"); | |
116 | } | |
117 | ||
118 | return ret; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
123 | * MUST be bind(2) before. | |
124 | */ | |
125 | struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock) | |
126 | { | |
127 | int new_fd; | |
128 | socklen_t len = 0; | |
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 | ||
139 | new_sock = lttcomm_alloc_sock(LTTCOMM_INET, sock->proto); | |
140 | if (new_sock == NULL) { | |
141 | goto error; | |
142 | } | |
143 | ||
144 | /* Blocking call */ | |
145 | new_fd = accept(sock->fd, | |
146 | (struct sockaddr *) &new_sock->sockaddr.addr.sin6, &len); | |
147 | if (new_fd < 0) { | |
148 | PERROR("accept inet6"); | |
149 | goto error; | |
150 | } | |
151 | ||
152 | new_sock->fd = new_fd; | |
153 | ||
154 | end: | |
155 | return new_sock; | |
156 | ||
157 | error: | |
158 | free(new_sock); | |
159 | return NULL; | |
160 | } | |
161 | ||
162 | /* | |
163 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
164 | */ | |
165 | int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog) | |
166 | { | |
167 | int ret; | |
168 | ||
169 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
170 | /* listen(2) does not exist for UDP so simply return success. */ | |
171 | ret = 0; | |
172 | goto end; | |
173 | } | |
174 | ||
175 | /* Default listen backlog */ | |
176 | if (backlog <= 0) { | |
177 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
178 | } | |
179 | ||
180 | ret = listen(sock->fd, backlog); | |
181 | if (ret < 0) { | |
182 | PERROR("listen inet6"); | |
183 | } | |
184 | ||
185 | end: | |
186 | return ret; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
191 | * API. | |
192 | * | |
193 | * Return the size of received data. | |
194 | */ | |
195 | ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, | |
196 | size_t len, int flags) | |
197 | { | |
198 | struct msghdr msg; | |
199 | struct iovec iov[1]; | |
200 | ssize_t ret = -1; | |
201 | ||
202 | memset(&msg, 0, sizeof(msg)); | |
203 | ||
204 | iov[0].iov_base = buf; | |
205 | iov[0].iov_len = len; | |
206 | msg.msg_iov = iov; | |
207 | msg.msg_iovlen = 1; | |
208 | ||
209 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6; | |
210 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); | |
211 | ||
212 | if (flags == 0) { | |
213 | flags = MSG_WAITALL; | |
214 | } | |
215 | ||
216 | do { | |
217 | ret = recvmsg(sock->fd, &msg, flags); | |
218 | } while (ret < 0 && errno == EINTR); | |
219 | if (ret < 0) { | |
220 | PERROR("recvmsg inet6"); | |
221 | } | |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Send buf data of size len. Using sendmsg API. | |
228 | * | |
229 | * Return the size of sent data. | |
230 | */ | |
231 | ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, | |
232 | size_t len, int flags) | |
233 | { | |
234 | struct msghdr msg; | |
235 | struct iovec iov[1]; | |
236 | ssize_t ret = -1; | |
237 | ||
238 | memset(&msg, 0, sizeof(msg)); | |
239 | ||
240 | iov[0].iov_base = buf; | |
241 | iov[0].iov_len = len; | |
242 | msg.msg_iov = iov; | |
243 | msg.msg_iovlen = 1; | |
244 | ||
245 | switch (sock->proto) { | |
246 | case LTTCOMM_SOCK_UDP: | |
247 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6; | |
248 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); | |
249 | break; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | ||
254 | do { | |
255 | ret = sendmsg(sock->fd, &msg, flags); | |
256 | } while (ret < 0 && errno == EINTR); | |
257 | if (ret < 0) { | |
258 | /* | |
259 | * Only warn about EPIPE when quiet mode is deactivated. | |
260 | * We consider EPIPE as expected. | |
261 | */ | |
262 | if (errno != EPIPE || !lttng_opt_quiet) { | |
263 | PERROR("sendmsg inet6"); | |
264 | } | |
265 | } | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Shutdown cleanly and close. | |
272 | */ | |
273 | int lttcomm_close_inet6_sock(struct lttcomm_sock *sock) | |
274 | { | |
275 | int ret, closeret; | |
276 | ||
277 | /* Don't try to close an invalid mark socket */ | |
278 | if (sock->fd == -1) { | |
279 | return 0; | |
280 | } | |
281 | ||
282 | closeret = close(sock->fd); | |
283 | if (closeret) { | |
284 | PERROR("close inet6"); | |
285 | } | |
286 | ||
287 | /* Mark socket */ | |
288 | sock->fd = -1; | |
289 | ||
290 | return ret; | |
291 | } |