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 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
6364a07a DG |
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 | 28 | #include <fcntl.h> |
389fbf04 | 29 | #include <common/compat/time.h> |
a655f4cf | 30 | #include <poll.h> |
6364a07a | 31 | |
90e535ef | 32 | #include <common/common.h> |
395d6b02 | 33 | #include <common/time.h> |
6364a07a DG |
34 | |
35 | #include "inet6.h" | |
36 | ||
a655f4cf MD |
37 | #define RECONNECT_DELAY 200 /* ms */ |
38 | ||
6364a07a DG |
39 | /* |
40 | * INET protocol operations. | |
41 | */ | |
42 | static const struct lttcomm_proto_ops inet6_ops = { | |
43 | .bind = lttcomm_bind_inet6_sock, | |
44 | .close = lttcomm_close_inet6_sock, | |
45 | .connect = lttcomm_connect_inet6_sock, | |
46 | .accept = lttcomm_accept_inet6_sock, | |
47 | .listen = lttcomm_listen_inet6_sock, | |
48 | .recvmsg = lttcomm_recvmsg_inet6_sock, | |
49 | .sendmsg = lttcomm_sendmsg_inet6_sock, | |
50 | }; | |
51 | ||
52 | /* | |
53 | * Creates an PF_INET socket. | |
54 | */ | |
90e535ef | 55 | LTTNG_HIDDEN |
6364a07a DG |
56 | int lttcomm_create_inet6_sock(struct lttcomm_sock *sock, int type, int proto) |
57 | { | |
de5e9086 | 58 | int val = 1, ret; |
783a3b9a | 59 | unsigned long timeout; |
6364a07a DG |
60 | |
61 | /* Create server socket */ | |
7b43086d | 62 | if ((sock->fd = socket(PF_INET6, type, proto)) < 0) { |
6364a07a DG |
63 | PERROR("socket inet6"); |
64 | goto error; | |
65 | } | |
66 | ||
67 | sock->ops = &inet6_ops; | |
68 | ||
69 | /* | |
70 | * Set socket option to reuse the address. | |
71 | */ | |
72 | ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int)); | |
73 | if (ret < 0) { | |
74 | PERROR("setsockopt inet6"); | |
75 | goto error; | |
76 | } | |
783a3b9a MD |
77 | timeout = lttcomm_get_network_timeout(); |
78 | if (timeout) { | |
79 | ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout); | |
80 | if (ret) { | |
81 | goto error; | |
82 | } | |
83 | ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout); | |
84 | if (ret) { | |
85 | goto error; | |
86 | } | |
87 | } | |
6364a07a DG |
88 | |
89 | return 0; | |
90 | ||
91 | error: | |
92 | return -1; | |
93 | } | |
94 | ||
95 | /* | |
96 | * Bind socket and return. | |
97 | */ | |
90e535ef | 98 | LTTNG_HIDDEN |
6364a07a DG |
99 | int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock) |
100 | { | |
2288467f JG |
101 | return bind(sock->fd, |
102 | (const struct sockaddr *) &sock->sockaddr.addr.sin6, | |
6364a07a | 103 | sizeof(sock->sockaddr.addr.sin6)); |
6364a07a DG |
104 | } |
105 | ||
a655f4cf MD |
106 | static |
107 | int connect_no_timeout(struct lttcomm_sock *sock) | |
108 | { | |
109 | return connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin6, | |
110 | sizeof(sock->sockaddr.addr.sin6)); | |
111 | } | |
112 | ||
113 | /* | |
114 | * Return time_a - time_b in milliseconds. | |
115 | */ | |
116 | static | |
117 | unsigned long time_diff_ms(struct timespec *time_a, | |
118 | struct timespec *time_b) | |
119 | { | |
120 | time_t sec_diff; | |
121 | long nsec_diff; | |
122 | unsigned long result_ms; | |
123 | ||
124 | sec_diff = time_a->tv_sec - time_b->tv_sec; | |
125 | nsec_diff = time_a->tv_nsec - time_b->tv_nsec; | |
126 | ||
127 | result_ms = sec_diff * MSEC_PER_SEC; | |
128 | result_ms += nsec_diff / NSEC_PER_MSEC; | |
129 | return result_ms; | |
130 | } | |
131 | ||
132 | static | |
133 | int connect_with_timeout(struct lttcomm_sock *sock) | |
134 | { | |
135 | unsigned long timeout = lttcomm_get_network_timeout(); | |
136 | int ret, flags, connect_ret; | |
137 | struct timespec orig_time, cur_time; | |
138 | ||
139 | ret = fcntl(sock->fd, F_GETFL, 0); | |
140 | if (ret == -1) { | |
141 | PERROR("fcntl"); | |
142 | return -1; | |
143 | } | |
144 | flags = ret; | |
145 | ||
146 | /* Set socket to nonblock */ | |
147 | ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK); | |
148 | if (ret == -1) { | |
149 | PERROR("fcntl"); | |
150 | return -1; | |
151 | } | |
152 | ||
389fbf04 | 153 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time); |
a655f4cf MD |
154 | if (ret == -1) { |
155 | PERROR("clock_gettime"); | |
156 | return -1; | |
157 | } | |
158 | ||
159 | connect_ret = connect(sock->fd, | |
160 | (struct sockaddr *) &sock->sockaddr.addr.sin6, | |
161 | sizeof(sock->sockaddr.addr.sin6)); | |
162 | if (connect_ret == -1 && errno != EAGAIN | |
163 | && errno != EWOULDBLOCK | |
164 | && errno != EINPROGRESS) { | |
165 | goto error; | |
166 | } else if (!connect_ret) { | |
167 | /* Connect succeeded */ | |
168 | goto success; | |
169 | } | |
170 | ||
48ac9596 JR |
171 | DBG("Asynchronous connect for sock %d, performing polling with" |
172 | " timeout: %lums", sock->fd, timeout); | |
173 | ||
a655f4cf MD |
174 | /* |
175 | * Perform poll loop following EINPROGRESS recommendation from | |
176 | * connect(2) man page. | |
177 | */ | |
178 | do { | |
179 | struct pollfd fds; | |
180 | ||
181 | fds.fd = sock->fd; | |
182 | fds.events = POLLOUT; | |
183 | fds.revents = 0; | |
184 | ret = poll(&fds, 1, RECONNECT_DELAY); | |
185 | if (ret < 0) { | |
186 | goto error; | |
187 | } else if (ret > 0) { | |
188 | int optval; | |
189 | socklen_t optval_len = sizeof(optval); | |
190 | ||
191 | if (!(fds.revents & POLLOUT)) { | |
192 | /* Either hup or error */ | |
193 | errno = EPIPE; | |
194 | goto error; | |
195 | } | |
196 | /* got something */ | |
197 | ret = getsockopt(sock->fd, SOL_SOCKET, | |
198 | SO_ERROR, &optval, &optval_len); | |
199 | if (ret) { | |
48ac9596 | 200 | PERROR("getsockopt"); |
a655f4cf MD |
201 | goto error; |
202 | } | |
203 | if (!optval) { | |
204 | connect_ret = 0; | |
205 | goto success; | |
206 | } else { | |
48ac9596 JR |
207 | /* Get actual connect() errno from opt_val */ |
208 | errno = optval; | |
a655f4cf MD |
209 | goto error; |
210 | } | |
211 | } | |
212 | /* ret == 0: timeout */ | |
389fbf04 | 213 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time); |
a655f4cf MD |
214 | if (ret == -1) { |
215 | PERROR("clock_gettime"); | |
216 | connect_ret = ret; | |
217 | goto error; | |
218 | } | |
219 | } while (time_diff_ms(&cur_time, &orig_time) < timeout); | |
220 | ||
221 | /* Timeout */ | |
222 | errno = ETIMEDOUT; | |
223 | connect_ret = -1; | |
224 | ||
225 | success: | |
226 | /* Restore initial flags */ | |
227 | ret = fcntl(sock->fd, F_SETFL, flags); | |
228 | if (ret == -1) { | |
229 | PERROR("fcntl"); | |
230 | /* Continue anyway */ | |
231 | } | |
232 | error: | |
233 | return connect_ret; | |
234 | } | |
235 | ||
6364a07a DG |
236 | /* |
237 | * Connect PF_INET socket. | |
238 | */ | |
90e535ef | 239 | LTTNG_HIDDEN |
6364a07a DG |
240 | int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock) |
241 | { | |
242 | int ret, closeret; | |
243 | ||
a655f4cf MD |
244 | if (lttcomm_get_network_timeout()) { |
245 | ret = connect_with_timeout(sock); | |
246 | } else { | |
247 | ret = connect_no_timeout(sock); | |
248 | } | |
6364a07a | 249 | if (ret < 0) { |
82c05d47 | 250 | PERROR("connect inet6"); |
6364a07a DG |
251 | goto error_connect; |
252 | } | |
253 | ||
254 | return ret; | |
255 | ||
256 | error_connect: | |
257 | closeret = close(sock->fd); | |
258 | if (closeret) { | |
259 | PERROR("close inet6"); | |
260 | } | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
267 | * MUST be bind(2) before. | |
268 | */ | |
90e535ef | 269 | LTTNG_HIDDEN |
6364a07a DG |
270 | struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock) |
271 | { | |
272 | int new_fd; | |
88a5db70 | 273 | socklen_t len; |
6364a07a DG |
274 | struct lttcomm_sock *new_sock; |
275 | ||
276 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
277 | /* | |
278 | * accept(2) does not exist for UDP so simply return the passed socket. | |
279 | */ | |
280 | new_sock = sock; | |
281 | goto end; | |
282 | } | |
283 | ||
de5e9086 | 284 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
285 | if (new_sock == NULL) { |
286 | goto error; | |
287 | } | |
288 | ||
88a5db70 DG |
289 | len = sizeof(new_sock->sockaddr.addr.sin6); |
290 | ||
6364a07a DG |
291 | /* Blocking call */ |
292 | new_fd = accept(sock->fd, | |
293 | (struct sockaddr *) &new_sock->sockaddr.addr.sin6, &len); | |
294 | if (new_fd < 0) { | |
295 | PERROR("accept inet6"); | |
296 | goto error; | |
297 | } | |
298 | ||
299 | new_sock->fd = new_fd; | |
de5e9086 | 300 | new_sock->ops = &inet6_ops; |
6364a07a DG |
301 | |
302 | end: | |
303 | return new_sock; | |
304 | ||
305 | error: | |
306 | free(new_sock); | |
307 | return NULL; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
312 | */ | |
90e535ef | 313 | LTTNG_HIDDEN |
6364a07a DG |
314 | int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog) |
315 | { | |
316 | int ret; | |
317 | ||
318 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
319 | /* listen(2) does not exist for UDP so simply return success. */ | |
320 | ret = 0; | |
321 | goto end; | |
322 | } | |
323 | ||
324 | /* Default listen backlog */ | |
325 | if (backlog <= 0) { | |
326 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
327 | } | |
328 | ||
329 | ret = listen(sock->fd, backlog); | |
330 | if (ret < 0) { | |
331 | PERROR("listen inet6"); | |
332 | } | |
333 | ||
334 | end: | |
335 | return ret; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
340 | * API. | |
341 | * | |
342 | * Return the size of received data. | |
343 | */ | |
90e535ef | 344 | LTTNG_HIDDEN |
6364a07a DG |
345 | ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, |
346 | size_t len, int flags) | |
347 | { | |
348 | struct msghdr msg; | |
349 | struct iovec iov[1]; | |
350 | ssize_t ret = -1; | |
7c5aef62 | 351 | size_t len_last; |
6364a07a DG |
352 | |
353 | memset(&msg, 0, sizeof(msg)); | |
354 | ||
355 | iov[0].iov_base = buf; | |
356 | iov[0].iov_len = len; | |
357 | msg.msg_iov = iov; | |
358 | msg.msg_iovlen = 1; | |
359 | ||
360 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6; | |
361 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); | |
362 | ||
6364a07a | 363 | do { |
7c5aef62 | 364 | len_last = iov[0].iov_len; |
6364a07a | 365 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 | 366 | if (ret > 0) { |
5312a3ed JG |
367 | if (flags & MSG_DONTWAIT) { |
368 | goto end; | |
369 | } | |
7c5aef62 DG |
370 | iov[0].iov_base += ret; |
371 | iov[0].iov_len -= ret; | |
372 | assert(ret <= len_last); | |
373 | } | |
374 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
6364a07a | 375 | if (ret < 0) { |
7c5aef62 DG |
376 | PERROR("recvmsg inet"); |
377 | } else if (ret > 0) { | |
378 | ret = len; | |
6364a07a | 379 | } |
7c5aef62 | 380 | /* Else ret = 0 meaning an orderly shutdown. */ |
5312a3ed | 381 | end: |
6364a07a DG |
382 | return ret; |
383 | } | |
384 | ||
385 | /* | |
386 | * Send buf data of size len. Using sendmsg API. | |
387 | * | |
388 | * Return the size of sent data. | |
389 | */ | |
90e535ef | 390 | LTTNG_HIDDEN |
c2d69327 | 391 | ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, const void *buf, |
6364a07a DG |
392 | size_t len, int flags) |
393 | { | |
394 | struct msghdr msg; | |
395 | struct iovec iov[1]; | |
396 | ssize_t ret = -1; | |
397 | ||
398 | memset(&msg, 0, sizeof(msg)); | |
399 | ||
c2d69327 | 400 | iov[0].iov_base = (void *) buf; |
6364a07a DG |
401 | iov[0].iov_len = len; |
402 | msg.msg_iov = iov; | |
403 | msg.msg_iovlen = 1; | |
404 | ||
405 | switch (sock->proto) { | |
406 | case LTTCOMM_SOCK_UDP: | |
407 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6; | |
408 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); | |
409 | break; | |
410 | default: | |
411 | break; | |
412 | } | |
413 | ||
414 | do { | |
415 | ret = sendmsg(sock->fd, &msg, flags); | |
416 | } while (ret < 0 && errno == EINTR); | |
417 | if (ret < 0) { | |
418 | /* | |
419 | * Only warn about EPIPE when quiet mode is deactivated. | |
420 | * We consider EPIPE as expected. | |
421 | */ | |
422 | if (errno != EPIPE || !lttng_opt_quiet) { | |
423 | PERROR("sendmsg inet6"); | |
424 | } | |
425 | } | |
426 | ||
427 | return ret; | |
428 | } | |
429 | ||
430 | /* | |
431 | * Shutdown cleanly and close. | |
432 | */ | |
90e535ef | 433 | LTTNG_HIDDEN |
6364a07a DG |
434 | int lttcomm_close_inet6_sock(struct lttcomm_sock *sock) |
435 | { | |
6e742359 | 436 | int ret; |
6364a07a | 437 | |
de5e9086 | 438 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
439 | if (sock->fd == -1) { |
440 | return 0; | |
441 | } | |
442 | ||
6e742359 DG |
443 | ret = close(sock->fd); |
444 | if (ret) { | |
6364a07a DG |
445 | PERROR("close inet6"); |
446 | } | |
447 | ||
448 | /* Mark socket */ | |
449 | sock->fd = -1; | |
450 | ||
451 | return ret; | |
452 | } |