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> | |
a655f4cf MD |
28 | #include <fcntl.h> |
29 | #include <time.h> | |
30 | #include <poll.h> | |
6364a07a | 31 | |
90e535ef | 32 | #include <common/common.h> |
6364a07a DG |
33 | |
34 | #include "inet6.h" | |
35 | ||
a655f4cf MD |
36 | #define MSEC_PER_SEC 1000 |
37 | #define NSEC_PER_MSEC 1000000 | |
38 | #define RECONNECT_DELAY 200 /* ms */ | |
39 | ||
6364a07a DG |
40 | /* |
41 | * INET protocol operations. | |
42 | */ | |
43 | static const struct lttcomm_proto_ops inet6_ops = { | |
44 | .bind = lttcomm_bind_inet6_sock, | |
45 | .close = lttcomm_close_inet6_sock, | |
46 | .connect = lttcomm_connect_inet6_sock, | |
47 | .accept = lttcomm_accept_inet6_sock, | |
48 | .listen = lttcomm_listen_inet6_sock, | |
49 | .recvmsg = lttcomm_recvmsg_inet6_sock, | |
50 | .sendmsg = lttcomm_sendmsg_inet6_sock, | |
51 | }; | |
52 | ||
53 | /* | |
54 | * Creates an PF_INET socket. | |
55 | */ | |
90e535ef | 56 | LTTNG_HIDDEN |
6364a07a DG |
57 | int lttcomm_create_inet6_sock(struct lttcomm_sock *sock, int type, int proto) |
58 | { | |
de5e9086 | 59 | int val = 1, ret; |
783a3b9a | 60 | unsigned long timeout; |
6364a07a DG |
61 | |
62 | /* Create server socket */ | |
7b43086d | 63 | if ((sock->fd = socket(PF_INET6, type, proto)) < 0) { |
6364a07a DG |
64 | PERROR("socket inet6"); |
65 | goto error; | |
66 | } | |
67 | ||
68 | sock->ops = &inet6_ops; | |
69 | ||
70 | /* | |
71 | * Set socket option to reuse the address. | |
72 | */ | |
73 | ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int)); | |
74 | if (ret < 0) { | |
75 | PERROR("setsockopt inet6"); | |
76 | goto error; | |
77 | } | |
783a3b9a MD |
78 | timeout = lttcomm_get_network_timeout(); |
79 | if (timeout) { | |
80 | ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout); | |
81 | if (ret) { | |
82 | goto error; | |
83 | } | |
84 | ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout); | |
85 | if (ret) { | |
86 | goto error; | |
87 | } | |
88 | } | |
6364a07a DG |
89 | |
90 | return 0; | |
91 | ||
92 | error: | |
93 | return -1; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Bind socket and return. | |
98 | */ | |
90e535ef | 99 | LTTNG_HIDDEN |
6364a07a DG |
100 | int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock) |
101 | { | |
102 | int ret; | |
103 | ||
104 | ret = bind(sock->fd, &sock->sockaddr.addr.sin6, | |
105 | sizeof(sock->sockaddr.addr.sin6)); | |
106 | if (ret < 0) { | |
107 | PERROR("bind inet6"); | |
108 | } | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
a655f4cf MD |
113 | static |
114 | int connect_no_timeout(struct lttcomm_sock *sock) | |
115 | { | |
116 | return connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin6, | |
117 | sizeof(sock->sockaddr.addr.sin6)); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Return time_a - time_b in milliseconds. | |
122 | */ | |
123 | static | |
124 | unsigned long time_diff_ms(struct timespec *time_a, | |
125 | struct timespec *time_b) | |
126 | { | |
127 | time_t sec_diff; | |
128 | long nsec_diff; | |
129 | unsigned long result_ms; | |
130 | ||
131 | sec_diff = time_a->tv_sec - time_b->tv_sec; | |
132 | nsec_diff = time_a->tv_nsec - time_b->tv_nsec; | |
133 | ||
134 | result_ms = sec_diff * MSEC_PER_SEC; | |
135 | result_ms += nsec_diff / NSEC_PER_MSEC; | |
136 | return result_ms; | |
137 | } | |
138 | ||
139 | static | |
140 | int connect_with_timeout(struct lttcomm_sock *sock) | |
141 | { | |
142 | unsigned long timeout = lttcomm_get_network_timeout(); | |
143 | int ret, flags, connect_ret; | |
144 | struct timespec orig_time, cur_time; | |
145 | ||
146 | ret = fcntl(sock->fd, F_GETFL, 0); | |
147 | if (ret == -1) { | |
148 | PERROR("fcntl"); | |
149 | return -1; | |
150 | } | |
151 | flags = ret; | |
152 | ||
153 | /* Set socket to nonblock */ | |
154 | ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK); | |
155 | if (ret == -1) { | |
156 | PERROR("fcntl"); | |
157 | return -1; | |
158 | } | |
159 | ||
160 | ret = clock_gettime(CLOCK_MONOTONIC, &orig_time); | |
161 | if (ret == -1) { | |
162 | PERROR("clock_gettime"); | |
163 | return -1; | |
164 | } | |
165 | ||
166 | connect_ret = connect(sock->fd, | |
167 | (struct sockaddr *) &sock->sockaddr.addr.sin6, | |
168 | sizeof(sock->sockaddr.addr.sin6)); | |
169 | if (connect_ret == -1 && errno != EAGAIN | |
170 | && errno != EWOULDBLOCK | |
171 | && errno != EINPROGRESS) { | |
172 | goto error; | |
173 | } else if (!connect_ret) { | |
174 | /* Connect succeeded */ | |
175 | goto success; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Perform poll loop following EINPROGRESS recommendation from | |
180 | * connect(2) man page. | |
181 | */ | |
182 | do { | |
183 | struct pollfd fds; | |
184 | ||
185 | fds.fd = sock->fd; | |
186 | fds.events = POLLOUT; | |
187 | fds.revents = 0; | |
188 | ret = poll(&fds, 1, RECONNECT_DELAY); | |
189 | if (ret < 0) { | |
190 | goto error; | |
191 | } else if (ret > 0) { | |
192 | int optval; | |
193 | socklen_t optval_len = sizeof(optval); | |
194 | ||
195 | if (!(fds.revents & POLLOUT)) { | |
196 | /* Either hup or error */ | |
197 | errno = EPIPE; | |
198 | goto error; | |
199 | } | |
200 | /* got something */ | |
201 | ret = getsockopt(sock->fd, SOL_SOCKET, | |
202 | SO_ERROR, &optval, &optval_len); | |
203 | if (ret) { | |
204 | goto error; | |
205 | } | |
206 | if (!optval) { | |
207 | connect_ret = 0; | |
208 | goto success; | |
209 | } else { | |
210 | goto error; | |
211 | } | |
212 | } | |
213 | /* ret == 0: timeout */ | |
214 | ret = clock_gettime(CLOCK_MONOTONIC, &cur_time); | |
215 | if (ret == -1) { | |
216 | PERROR("clock_gettime"); | |
217 | connect_ret = ret; | |
218 | goto error; | |
219 | } | |
220 | } while (time_diff_ms(&cur_time, &orig_time) < timeout); | |
221 | ||
222 | /* Timeout */ | |
223 | errno = ETIMEDOUT; | |
224 | connect_ret = -1; | |
225 | ||
226 | success: | |
227 | /* Restore initial flags */ | |
228 | ret = fcntl(sock->fd, F_SETFL, flags); | |
229 | if (ret == -1) { | |
230 | PERROR("fcntl"); | |
231 | /* Continue anyway */ | |
232 | } | |
233 | error: | |
234 | return connect_ret; | |
235 | } | |
236 | ||
6364a07a DG |
237 | /* |
238 | * Connect PF_INET socket. | |
239 | */ | |
90e535ef | 240 | LTTNG_HIDDEN |
6364a07a DG |
241 | int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock) |
242 | { | |
243 | int ret, closeret; | |
244 | ||
a655f4cf MD |
245 | if (lttcomm_get_network_timeout()) { |
246 | ret = connect_with_timeout(sock); | |
247 | } else { | |
248 | ret = connect_no_timeout(sock); | |
249 | } | |
6364a07a | 250 | if (ret < 0) { |
82c05d47 | 251 | PERROR("connect inet6"); |
6364a07a DG |
252 | goto error_connect; |
253 | } | |
254 | ||
255 | return ret; | |
256 | ||
257 | error_connect: | |
258 | closeret = close(sock->fd); | |
259 | if (closeret) { | |
260 | PERROR("close inet6"); | |
261 | } | |
262 | ||
263 | return ret; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
268 | * MUST be bind(2) before. | |
269 | */ | |
90e535ef | 270 | LTTNG_HIDDEN |
6364a07a DG |
271 | struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock) |
272 | { | |
273 | int new_fd; | |
88a5db70 | 274 | socklen_t len; |
6364a07a DG |
275 | struct lttcomm_sock *new_sock; |
276 | ||
277 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
278 | /* | |
279 | * accept(2) does not exist for UDP so simply return the passed socket. | |
280 | */ | |
281 | new_sock = sock; | |
282 | goto end; | |
283 | } | |
284 | ||
de5e9086 | 285 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
286 | if (new_sock == NULL) { |
287 | goto error; | |
288 | } | |
289 | ||
88a5db70 DG |
290 | len = sizeof(new_sock->sockaddr.addr.sin6); |
291 | ||
6364a07a DG |
292 | /* Blocking call */ |
293 | new_fd = accept(sock->fd, | |
294 | (struct sockaddr *) &new_sock->sockaddr.addr.sin6, &len); | |
295 | if (new_fd < 0) { | |
296 | PERROR("accept inet6"); | |
297 | goto error; | |
298 | } | |
299 | ||
300 | new_sock->fd = new_fd; | |
de5e9086 | 301 | new_sock->ops = &inet6_ops; |
6364a07a DG |
302 | |
303 | end: | |
304 | return new_sock; | |
305 | ||
306 | error: | |
307 | free(new_sock); | |
308 | return NULL; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
313 | */ | |
90e535ef | 314 | LTTNG_HIDDEN |
6364a07a DG |
315 | int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog) |
316 | { | |
317 | int ret; | |
318 | ||
319 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
320 | /* listen(2) does not exist for UDP so simply return success. */ | |
321 | ret = 0; | |
322 | goto end; | |
323 | } | |
324 | ||
325 | /* Default listen backlog */ | |
326 | if (backlog <= 0) { | |
327 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
328 | } | |
329 | ||
330 | ret = listen(sock->fd, backlog); | |
331 | if (ret < 0) { | |
332 | PERROR("listen inet6"); | |
333 | } | |
334 | ||
335 | end: | |
336 | return ret; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
341 | * API. | |
342 | * | |
343 | * Return the size of received data. | |
344 | */ | |
90e535ef | 345 | LTTNG_HIDDEN |
6364a07a DG |
346 | ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, |
347 | size_t len, int flags) | |
348 | { | |
349 | struct msghdr msg; | |
350 | struct iovec iov[1]; | |
351 | ssize_t ret = -1; | |
7c5aef62 | 352 | size_t len_last; |
6364a07a DG |
353 | |
354 | memset(&msg, 0, sizeof(msg)); | |
355 | ||
356 | iov[0].iov_base = buf; | |
357 | iov[0].iov_len = len; | |
358 | msg.msg_iov = iov; | |
359 | msg.msg_iovlen = 1; | |
360 | ||
361 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6; | |
362 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); | |
363 | ||
6364a07a | 364 | do { |
7c5aef62 | 365 | len_last = iov[0].iov_len; |
6364a07a | 366 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 DG |
367 | if (ret > 0) { |
368 | iov[0].iov_base += ret; | |
369 | iov[0].iov_len -= ret; | |
370 | assert(ret <= len_last); | |
371 | } | |
372 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
6364a07a | 373 | if (ret < 0) { |
7c5aef62 DG |
374 | PERROR("recvmsg inet"); |
375 | } else if (ret > 0) { | |
376 | ret = len; | |
6364a07a | 377 | } |
7c5aef62 | 378 | /* Else ret = 0 meaning an orderly shutdown. */ |
6364a07a DG |
379 | |
380 | return ret; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Send buf data of size len. Using sendmsg API. | |
385 | * | |
386 | * Return the size of sent data. | |
387 | */ | |
90e535ef | 388 | LTTNG_HIDDEN |
6364a07a DG |
389 | ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, |
390 | size_t len, int flags) | |
391 | { | |
392 | struct msghdr msg; | |
393 | struct iovec iov[1]; | |
394 | ssize_t ret = -1; | |
395 | ||
396 | memset(&msg, 0, sizeof(msg)); | |
397 | ||
398 | iov[0].iov_base = buf; | |
399 | iov[0].iov_len = len; | |
400 | msg.msg_iov = iov; | |
401 | msg.msg_iovlen = 1; | |
402 | ||
403 | switch (sock->proto) { | |
404 | case LTTCOMM_SOCK_UDP: | |
405 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6; | |
406 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); | |
407 | break; | |
408 | default: | |
409 | break; | |
410 | } | |
411 | ||
412 | do { | |
413 | ret = sendmsg(sock->fd, &msg, flags); | |
414 | } while (ret < 0 && errno == EINTR); | |
415 | if (ret < 0) { | |
416 | /* | |
417 | * Only warn about EPIPE when quiet mode is deactivated. | |
418 | * We consider EPIPE as expected. | |
419 | */ | |
420 | if (errno != EPIPE || !lttng_opt_quiet) { | |
421 | PERROR("sendmsg inet6"); | |
422 | } | |
423 | } | |
424 | ||
425 | return ret; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Shutdown cleanly and close. | |
430 | */ | |
90e535ef | 431 | LTTNG_HIDDEN |
6364a07a DG |
432 | int lttcomm_close_inet6_sock(struct lttcomm_sock *sock) |
433 | { | |
6e742359 | 434 | int ret; |
6364a07a | 435 | |
de5e9086 | 436 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
437 | if (sock->fd == -1) { |
438 | return 0; | |
439 | } | |
440 | ||
6e742359 DG |
441 | ret = close(sock->fd); |
442 | if (ret) { | |
6364a07a DG |
443 | PERROR("close inet6"); |
444 | } | |
445 | ||
446 | /* Mark socket */ | |
447 | sock->fd = -1; | |
448 | ||
449 | return ret; | |
450 | } |