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 "inet.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 inet_ops = { | |
44 | .bind = lttcomm_bind_inet_sock, | |
45 | .close = lttcomm_close_inet_sock, | |
46 | .connect = lttcomm_connect_inet_sock, | |
47 | .accept = lttcomm_accept_inet_sock, | |
48 | .listen = lttcomm_listen_inet_sock, | |
49 | .recvmsg = lttcomm_recvmsg_inet_sock, | |
50 | .sendmsg = lttcomm_sendmsg_inet_sock, | |
51 | }; | |
52 | ||
d831c249 DG |
53 | unsigned long lttcomm_inet_tcp_timeout; |
54 | ||
6364a07a DG |
55 | /* |
56 | * Creates an PF_INET socket. | |
57 | */ | |
90e535ef | 58 | LTTNG_HIDDEN |
6364a07a DG |
59 | int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type, int proto) |
60 | { | |
de5e9086 | 61 | int val = 1, ret; |
783a3b9a | 62 | unsigned long timeout; |
6364a07a DG |
63 | |
64 | /* Create server socket */ | |
65 | if ((sock->fd = socket(PF_INET, type, proto)) < 0) { | |
66 | PERROR("socket inet"); | |
67 | goto error; | |
68 | } | |
69 | ||
70 | sock->ops = &inet_ops; | |
71 | ||
72 | /* | |
73 | * Set socket option to reuse the address. | |
74 | */ | |
75 | ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int)); | |
76 | if (ret < 0) { | |
77 | PERROR("setsockopt inet"); | |
78 | goto error; | |
79 | } | |
783a3b9a MD |
80 | timeout = lttcomm_get_network_timeout(); |
81 | if (timeout) { | |
82 | ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout); | |
83 | if (ret) { | |
84 | goto error; | |
85 | } | |
86 | ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout); | |
87 | if (ret) { | |
88 | goto error; | |
89 | } | |
90 | } | |
6364a07a DG |
91 | |
92 | return 0; | |
93 | ||
94 | error: | |
95 | return -1; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Bind socket and return. | |
100 | */ | |
90e535ef | 101 | LTTNG_HIDDEN |
6364a07a DG |
102 | int lttcomm_bind_inet_sock(struct lttcomm_sock *sock) |
103 | { | |
104 | int ret; | |
105 | ||
106 | ret = bind(sock->fd, &sock->sockaddr.addr.sin, | |
107 | sizeof(sock->sockaddr.addr.sin)); | |
108 | if (ret < 0) { | |
109 | PERROR("bind inet"); | |
110 | } | |
111 | ||
112 | return ret; | |
113 | } | |
114 | ||
a655f4cf MD |
115 | static |
116 | int connect_no_timeout(struct lttcomm_sock *sock) | |
117 | { | |
118 | return connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin, | |
119 | sizeof(sock->sockaddr.addr.sin)); | |
120 | } | |
121 | ||
122 | /* | |
123 | * Return time_a - time_b in milliseconds. | |
124 | */ | |
125 | static | |
126 | unsigned long time_diff_ms(struct timespec *time_a, | |
127 | struct timespec *time_b) | |
128 | { | |
129 | time_t sec_diff; | |
130 | long nsec_diff; | |
131 | unsigned long result_ms; | |
132 | ||
133 | sec_diff = time_a->tv_sec - time_b->tv_sec; | |
134 | nsec_diff = time_a->tv_nsec - time_b->tv_nsec; | |
135 | ||
136 | result_ms = sec_diff * MSEC_PER_SEC; | |
137 | result_ms += nsec_diff / NSEC_PER_MSEC; | |
138 | return result_ms; | |
139 | } | |
140 | ||
141 | static | |
142 | int connect_with_timeout(struct lttcomm_sock *sock) | |
143 | { | |
144 | unsigned long timeout = lttcomm_get_network_timeout(); | |
145 | int ret, flags, connect_ret; | |
146 | struct timespec orig_time, cur_time; | |
147 | ||
148 | ret = fcntl(sock->fd, F_GETFL, 0); | |
149 | if (ret == -1) { | |
150 | PERROR("fcntl"); | |
151 | return -1; | |
152 | } | |
153 | flags = ret; | |
154 | ||
155 | /* Set socket to nonblock */ | |
156 | ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK); | |
157 | if (ret == -1) { | |
158 | PERROR("fcntl"); | |
159 | return -1; | |
160 | } | |
161 | ||
162 | ret = clock_gettime(CLOCK_MONOTONIC, &orig_time); | |
163 | if (ret == -1) { | |
164 | PERROR("clock_gettime"); | |
165 | return -1; | |
166 | } | |
167 | ||
168 | connect_ret = connect(sock->fd, | |
169 | (struct sockaddr *) &sock->sockaddr.addr.sin, | |
170 | sizeof(sock->sockaddr.addr.sin)); | |
171 | if (connect_ret == -1 && errno != EAGAIN | |
172 | && errno != EWOULDBLOCK | |
173 | && errno != EINPROGRESS) { | |
174 | goto error; | |
175 | } else if (!connect_ret) { | |
176 | /* Connect succeeded */ | |
177 | goto success; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Perform poll loop following EINPROGRESS recommendation from | |
182 | * connect(2) man page. | |
183 | */ | |
184 | do { | |
185 | struct pollfd fds; | |
186 | ||
187 | fds.fd = sock->fd; | |
188 | fds.events = POLLOUT; | |
189 | fds.revents = 0; | |
190 | ret = poll(&fds, 1, RECONNECT_DELAY); | |
191 | if (ret < 0) { | |
192 | goto error; | |
193 | } else if (ret > 0) { | |
194 | int optval; | |
195 | socklen_t optval_len = sizeof(optval); | |
196 | ||
197 | if (!(fds.revents & POLLOUT)) { | |
198 | /* Either hup or error */ | |
199 | errno = EPIPE; | |
200 | goto error; | |
201 | } | |
202 | /* got something */ | |
203 | ret = getsockopt(sock->fd, SOL_SOCKET, | |
204 | SO_ERROR, &optval, &optval_len); | |
205 | if (ret) { | |
206 | goto error; | |
207 | } | |
208 | if (!optval) { | |
209 | connect_ret = 0; | |
210 | goto success; | |
211 | } else { | |
212 | goto error; | |
213 | } | |
214 | } | |
215 | /* ret == 0: timeout */ | |
216 | ret = clock_gettime(CLOCK_MONOTONIC, &cur_time); | |
217 | if (ret == -1) { | |
218 | PERROR("clock_gettime"); | |
219 | connect_ret = ret; | |
220 | goto error; | |
221 | } | |
222 | } while (time_diff_ms(&cur_time, &orig_time) < timeout); | |
223 | ||
224 | /* Timeout */ | |
225 | errno = ETIMEDOUT; | |
226 | connect_ret = -1; | |
227 | ||
228 | success: | |
229 | /* Restore initial flags */ | |
230 | ret = fcntl(sock->fd, F_SETFL, flags); | |
231 | if (ret == -1) { | |
232 | PERROR("fcntl"); | |
233 | /* Continue anyway */ | |
234 | } | |
235 | error: | |
236 | return connect_ret; | |
237 | } | |
238 | ||
6364a07a DG |
239 | /* |
240 | * Connect PF_INET socket. | |
241 | */ | |
90e535ef | 242 | LTTNG_HIDDEN |
6364a07a DG |
243 | int lttcomm_connect_inet_sock(struct lttcomm_sock *sock) |
244 | { | |
245 | int ret, closeret; | |
246 | ||
a655f4cf MD |
247 | if (lttcomm_get_network_timeout()) { |
248 | ret = connect_with_timeout(sock); | |
249 | } else { | |
250 | ret = connect_no_timeout(sock); | |
251 | } | |
6364a07a | 252 | if (ret < 0) { |
82c05d47 | 253 | PERROR("connect"); |
6364a07a DG |
254 | goto error_connect; |
255 | } | |
256 | ||
257 | return ret; | |
258 | ||
259 | error_connect: | |
260 | closeret = close(sock->fd); | |
261 | if (closeret) { | |
262 | PERROR("close inet"); | |
263 | } | |
264 | ||
265 | return ret; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
270 | * MUST be bind(2) before. | |
271 | */ | |
90e535ef | 272 | LTTNG_HIDDEN |
6364a07a DG |
273 | struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock) |
274 | { | |
275 | int new_fd; | |
88a5db70 | 276 | socklen_t len; |
6364a07a DG |
277 | struct lttcomm_sock *new_sock; |
278 | ||
279 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
280 | /* | |
281 | * accept(2) does not exist for UDP so simply return the passed socket. | |
282 | */ | |
283 | new_sock = sock; | |
284 | goto end; | |
285 | } | |
286 | ||
de5e9086 | 287 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
288 | if (new_sock == NULL) { |
289 | goto error; | |
290 | } | |
291 | ||
88a5db70 DG |
292 | len = sizeof(new_sock->sockaddr.addr.sin); |
293 | ||
6364a07a DG |
294 | /* Blocking call */ |
295 | new_fd = accept(sock->fd, (struct sockaddr *) &new_sock->sockaddr.addr.sin, | |
296 | &len); | |
297 | if (new_fd < 0) { | |
298 | PERROR("accept inet"); | |
299 | goto error; | |
300 | } | |
301 | ||
302 | new_sock->fd = new_fd; | |
de5e9086 | 303 | new_sock->ops = &inet_ops; |
6364a07a DG |
304 | |
305 | end: | |
306 | return new_sock; | |
307 | ||
308 | error: | |
309 | free(new_sock); | |
310 | return NULL; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
315 | */ | |
90e535ef | 316 | LTTNG_HIDDEN |
6364a07a DG |
317 | int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog) |
318 | { | |
319 | int ret; | |
320 | ||
321 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
322 | /* listen(2) does not exist for UDP so simply return success. */ | |
323 | ret = 0; | |
324 | goto end; | |
325 | } | |
326 | ||
327 | /* Default listen backlog */ | |
328 | if (backlog <= 0) { | |
329 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
330 | } | |
331 | ||
332 | ret = listen(sock->fd, backlog); | |
333 | if (ret < 0) { | |
334 | PERROR("listen inet"); | |
335 | } | |
336 | ||
337 | end: | |
338 | return ret; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
343 | * API. | |
344 | * | |
345 | * Return the size of received data. | |
346 | */ | |
90e535ef | 347 | LTTNG_HIDDEN |
6364a07a DG |
348 | ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf, |
349 | size_t len, int flags) | |
350 | { | |
351 | struct msghdr msg; | |
352 | struct iovec iov[1]; | |
353 | ssize_t ret = -1; | |
7c5aef62 | 354 | size_t len_last; |
6364a07a DG |
355 | |
356 | memset(&msg, 0, sizeof(msg)); | |
357 | ||
358 | iov[0].iov_base = buf; | |
359 | iov[0].iov_len = len; | |
360 | msg.msg_iov = iov; | |
361 | msg.msg_iovlen = 1; | |
362 | ||
363 | msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin; | |
364 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin); | |
365 | ||
6364a07a | 366 | do { |
7c5aef62 | 367 | len_last = iov[0].iov_len; |
6364a07a | 368 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 DG |
369 | if (ret > 0) { |
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 DG |
375 | if (ret < 0) { |
376 | PERROR("recvmsg inet"); | |
7c5aef62 DG |
377 | } else if (ret > 0) { |
378 | ret = len; | |
6364a07a | 379 | } |
7c5aef62 | 380 | /* Else ret = 0 meaning an orderly shutdown. */ |
6364a07a DG |
381 | |
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 |
6364a07a DG |
391 | ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, void *buf, |
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 | ||
400 | iov[0].iov_base = buf; | |
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.sin; | |
408 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin); | |
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 inet"); | |
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_inet_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 inet"); |
446 | } | |
447 | ||
448 | /* Mark socket */ | |
449 | sock->fd = -1; | |
450 | ||
451 | return ret; | |
452 | } | |
d831c249 DG |
453 | |
454 | /* | |
455 | * Return value read from /proc or else 0 if value is not found. | |
456 | */ | |
457 | static unsigned long read_proc_value(const char *path) | |
458 | { | |
459 | int ret, fd; | |
460 | long r_val; | |
461 | unsigned long val = 0; | |
462 | char buf[64]; | |
463 | ||
464 | fd = open(path, O_RDONLY); | |
465 | if (fd < 0) { | |
466 | goto error; | |
467 | } | |
468 | ||
469 | ret = read(fd, buf, sizeof(buf)); | |
470 | if (ret < 0) { | |
471 | PERROR("read proc failed"); | |
472 | goto error_close; | |
473 | } | |
474 | ||
475 | errno = 0; | |
476 | r_val = strtol(buf, NULL, 10); | |
477 | if (errno != 0 || r_val < -1L) { | |
478 | val = 0; | |
479 | goto error_close; | |
480 | } else { | |
481 | if (r_val > 0) { | |
482 | val = r_val; | |
483 | } | |
484 | } | |
485 | ||
486 | error_close: | |
487 | ret = close(fd); | |
488 | if (ret) { | |
489 | PERROR("close /proc value"); | |
490 | } | |
491 | error: | |
492 | return val; | |
493 | } | |
494 | ||
495 | LTTNG_HIDDEN | |
496 | void lttcomm_inet_init(void) | |
497 | { | |
18eed43f DG |
498 | unsigned long syn_retries, fin_timeout, syn_timeout, env; |
499 | ||
500 | env = lttcomm_get_network_timeout(); | |
501 | if (env) { | |
502 | lttcomm_inet_tcp_timeout = env; | |
503 | goto end; | |
504 | } | |
d831c249 DG |
505 | |
506 | /* Assign default value and see if we can change it. */ | |
507 | lttcomm_inet_tcp_timeout = DEFAULT_INET_TCP_TIMEOUT; | |
508 | ||
509 | syn_retries = read_proc_value(LTTCOMM_INET_PROC_SYN_RETRIES_PATH); | |
510 | fin_timeout = read_proc_value(LTTCOMM_INET_PROC_FIN_TIMEOUT_PATH); | |
511 | ||
512 | syn_timeout = syn_retries * LTTCOMM_INET_SYN_TIMEOUT_FACTOR; | |
513 | ||
514 | /* | |
515 | * Get the maximum between the two possible timeout value and use that to | |
516 | * get the maximum with the default timeout. | |
517 | */ | |
518 | lttcomm_inet_tcp_timeout = max_t(unsigned long, | |
519 | max_t(unsigned long, syn_timeout, fin_timeout), | |
520 | lttcomm_inet_tcp_timeout); | |
521 | ||
18eed43f | 522 | end: |
d831c249 DG |
523 | DBG("TCP inet operation timeout set to %lu sec", lttcomm_inet_tcp_timeout); |
524 | } |