Commit | Line | Data |
---|---|---|
6364a07a | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2012 David Goulet <dgoulet@efficios.com> |
6364a07a | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
6364a07a | 5 | * |
6364a07a DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
6364a07a DG |
9 | #include <limits.h> |
10 | #include <stdio.h> | |
11 | #include <stdlib.h> | |
12 | #include <string.h> | |
13 | #include <sys/stat.h> | |
14 | #include <sys/types.h> | |
15 | #include <unistd.h> | |
a655f4cf | 16 | #include <fcntl.h> |
389fbf04 | 17 | #include <common/compat/time.h> |
a655f4cf | 18 | #include <poll.h> |
6364a07a | 19 | |
90e535ef | 20 | #include <common/common.h> |
395d6b02 | 21 | #include <common/time.h> |
edf4b93e | 22 | #include <common/compat/errno.h> |
6364a07a DG |
23 | |
24 | #include "inet6.h" | |
25 | ||
a655f4cf MD |
26 | #define RECONNECT_DELAY 200 /* ms */ |
27 | ||
6364a07a DG |
28 | /* |
29 | * INET protocol operations. | |
30 | */ | |
31 | static const struct lttcomm_proto_ops inet6_ops = { | |
32 | .bind = lttcomm_bind_inet6_sock, | |
33 | .close = lttcomm_close_inet6_sock, | |
34 | .connect = lttcomm_connect_inet6_sock, | |
35 | .accept = lttcomm_accept_inet6_sock, | |
36 | .listen = lttcomm_listen_inet6_sock, | |
37 | .recvmsg = lttcomm_recvmsg_inet6_sock, | |
38 | .sendmsg = lttcomm_sendmsg_inet6_sock, | |
39 | }; | |
40 | ||
41 | /* | |
42 | * Creates an PF_INET socket. | |
43 | */ | |
90e535ef | 44 | LTTNG_HIDDEN |
6364a07a DG |
45 | int lttcomm_create_inet6_sock(struct lttcomm_sock *sock, int type, int proto) |
46 | { | |
de5e9086 | 47 | int val = 1, ret; |
783a3b9a | 48 | unsigned long timeout; |
6364a07a DG |
49 | |
50 | /* Create server socket */ | |
7b43086d | 51 | if ((sock->fd = socket(PF_INET6, type, proto)) < 0) { |
6364a07a DG |
52 | PERROR("socket inet6"); |
53 | goto error; | |
54 | } | |
55 | ||
56 | sock->ops = &inet6_ops; | |
57 | ||
58 | /* | |
59 | * Set socket option to reuse the address. | |
60 | */ | |
61 | ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int)); | |
62 | if (ret < 0) { | |
63 | PERROR("setsockopt inet6"); | |
64 | goto error; | |
65 | } | |
783a3b9a MD |
66 | timeout = lttcomm_get_network_timeout(); |
67 | if (timeout) { | |
68 | ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout); | |
69 | if (ret) { | |
70 | goto error; | |
71 | } | |
72 | ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout); | |
73 | if (ret) { | |
74 | goto error; | |
75 | } | |
76 | } | |
6364a07a DG |
77 | |
78 | return 0; | |
79 | ||
80 | error: | |
81 | return -1; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Bind socket and return. | |
86 | */ | |
90e535ef | 87 | LTTNG_HIDDEN |
6364a07a DG |
88 | int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock) |
89 | { | |
2288467f | 90 | return bind(sock->fd, |
1a65bbb8 JG |
91 | (const struct sockaddr *) ALIGNED_CONST_PTR( |
92 | sock->sockaddr.addr.sin6), | |
6364a07a | 93 | sizeof(sock->sockaddr.addr.sin6)); |
6364a07a DG |
94 | } |
95 | ||
a655f4cf MD |
96 | static |
97 | int connect_no_timeout(struct lttcomm_sock *sock) | |
98 | { | |
1a65bbb8 JG |
99 | return connect(sock->fd, |
100 | (const struct sockaddr *) ALIGNED_CONST_PTR( | |
101 | sock->sockaddr.addr.sin6), | |
a655f4cf MD |
102 | sizeof(sock->sockaddr.addr.sin6)); |
103 | } | |
104 | ||
a655f4cf MD |
105 | static |
106 | int connect_with_timeout(struct lttcomm_sock *sock) | |
107 | { | |
108 | unsigned long timeout = lttcomm_get_network_timeout(); | |
109 | int ret, flags, connect_ret; | |
110 | struct timespec orig_time, cur_time; | |
2daf6502 | 111 | unsigned long diff_ms; |
a655f4cf MD |
112 | |
113 | ret = fcntl(sock->fd, F_GETFL, 0); | |
114 | if (ret == -1) { | |
115 | PERROR("fcntl"); | |
116 | return -1; | |
117 | } | |
118 | flags = ret; | |
119 | ||
120 | /* Set socket to nonblock */ | |
121 | ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK); | |
122 | if (ret == -1) { | |
123 | PERROR("fcntl"); | |
124 | return -1; | |
125 | } | |
126 | ||
389fbf04 | 127 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time); |
a655f4cf MD |
128 | if (ret == -1) { |
129 | PERROR("clock_gettime"); | |
130 | return -1; | |
131 | } | |
132 | ||
133 | connect_ret = connect(sock->fd, | |
1a65bbb8 JG |
134 | (const struct sockaddr *) ALIGNED_CONST_PTR( |
135 | sock->sockaddr.addr.sin6), | |
136 | sizeof(sock->sockaddr.addr.sin6)); | |
137 | if (connect_ret == -1 && errno != EAGAIN && errno != EWOULDBLOCK && | |
138 | errno != EINPROGRESS) { | |
a655f4cf MD |
139 | goto error; |
140 | } else if (!connect_ret) { | |
141 | /* Connect succeeded */ | |
142 | goto success; | |
143 | } | |
144 | ||
48ac9596 JR |
145 | DBG("Asynchronous connect for sock %d, performing polling with" |
146 | " timeout: %lums", sock->fd, timeout); | |
147 | ||
a655f4cf MD |
148 | /* |
149 | * Perform poll loop following EINPROGRESS recommendation from | |
150 | * connect(2) man page. | |
151 | */ | |
152 | do { | |
153 | struct pollfd fds; | |
154 | ||
155 | fds.fd = sock->fd; | |
156 | fds.events = POLLOUT; | |
157 | fds.revents = 0; | |
158 | ret = poll(&fds, 1, RECONNECT_DELAY); | |
159 | if (ret < 0) { | |
160 | goto error; | |
161 | } else if (ret > 0) { | |
162 | int optval; | |
163 | socklen_t optval_len = sizeof(optval); | |
164 | ||
165 | if (!(fds.revents & POLLOUT)) { | |
166 | /* Either hup or error */ | |
167 | errno = EPIPE; | |
168 | goto error; | |
169 | } | |
170 | /* got something */ | |
171 | ret = getsockopt(sock->fd, SOL_SOCKET, | |
172 | SO_ERROR, &optval, &optval_len); | |
173 | if (ret) { | |
48ac9596 | 174 | PERROR("getsockopt"); |
a655f4cf MD |
175 | goto error; |
176 | } | |
177 | if (!optval) { | |
178 | connect_ret = 0; | |
179 | goto success; | |
180 | } else { | |
48ac9596 JR |
181 | /* Get actual connect() errno from opt_val */ |
182 | errno = optval; | |
a655f4cf MD |
183 | goto error; |
184 | } | |
185 | } | |
186 | /* ret == 0: timeout */ | |
389fbf04 | 187 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time); |
a655f4cf MD |
188 | if (ret == -1) { |
189 | PERROR("clock_gettime"); | |
190 | connect_ret = ret; | |
191 | goto error; | |
192 | } | |
2daf6502 MD |
193 | if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) { |
194 | ERR("timespec_to_ms input overflows milliseconds output"); | |
195 | connect_ret = -1; | |
196 | goto error; | |
197 | } | |
198 | } while (diff_ms < timeout); | |
a655f4cf MD |
199 | |
200 | /* Timeout */ | |
201 | errno = ETIMEDOUT; | |
202 | connect_ret = -1; | |
203 | ||
204 | success: | |
205 | /* Restore initial flags */ | |
206 | ret = fcntl(sock->fd, F_SETFL, flags); | |
207 | if (ret == -1) { | |
208 | PERROR("fcntl"); | |
209 | /* Continue anyway */ | |
210 | } | |
211 | error: | |
212 | return connect_ret; | |
213 | } | |
214 | ||
6364a07a DG |
215 | /* |
216 | * Connect PF_INET socket. | |
217 | */ | |
90e535ef | 218 | LTTNG_HIDDEN |
6364a07a DG |
219 | int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock) |
220 | { | |
221 | int ret, closeret; | |
222 | ||
a655f4cf MD |
223 | if (lttcomm_get_network_timeout()) { |
224 | ret = connect_with_timeout(sock); | |
225 | } else { | |
226 | ret = connect_no_timeout(sock); | |
227 | } | |
6364a07a | 228 | if (ret < 0) { |
82c05d47 | 229 | PERROR("connect inet6"); |
6364a07a DG |
230 | goto error_connect; |
231 | } | |
232 | ||
233 | return ret; | |
234 | ||
235 | error_connect: | |
236 | closeret = close(sock->fd); | |
237 | if (closeret) { | |
238 | PERROR("close inet6"); | |
239 | } | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
246 | * MUST be bind(2) before. | |
247 | */ | |
90e535ef | 248 | LTTNG_HIDDEN |
6364a07a DG |
249 | struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock) |
250 | { | |
251 | int new_fd; | |
88a5db70 | 252 | socklen_t len; |
6364a07a | 253 | struct lttcomm_sock *new_sock; |
1a65bbb8 | 254 | struct sockaddr_in6 new_addr = {}; |
6364a07a DG |
255 | |
256 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
257 | /* | |
258 | * accept(2) does not exist for UDP so simply return the passed socket. | |
259 | */ | |
260 | new_sock = sock; | |
261 | goto end; | |
262 | } | |
263 | ||
de5e9086 | 264 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
265 | if (new_sock == NULL) { |
266 | goto error; | |
267 | } | |
268 | ||
1a65bbb8 | 269 | len = sizeof(new_addr); |
88a5db70 | 270 | |
6364a07a | 271 | /* Blocking call */ |
1a65bbb8 | 272 | new_fd = accept(sock->fd, (struct sockaddr *) &new_addr, &len); |
6364a07a DG |
273 | if (new_fd < 0) { |
274 | PERROR("accept inet6"); | |
275 | goto error; | |
276 | } | |
1a65bbb8 | 277 | new_sock->sockaddr.addr.sin6 = new_addr; |
6364a07a | 278 | new_sock->fd = new_fd; |
de5e9086 | 279 | new_sock->ops = &inet6_ops; |
6364a07a DG |
280 | |
281 | end: | |
282 | return new_sock; | |
283 | ||
284 | error: | |
285 | free(new_sock); | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | /* | |
290 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
291 | */ | |
90e535ef | 292 | LTTNG_HIDDEN |
6364a07a DG |
293 | int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog) |
294 | { | |
295 | int ret; | |
296 | ||
297 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
298 | /* listen(2) does not exist for UDP so simply return success. */ | |
299 | ret = 0; | |
300 | goto end; | |
301 | } | |
302 | ||
303 | /* Default listen backlog */ | |
304 | if (backlog <= 0) { | |
305 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
306 | } | |
307 | ||
308 | ret = listen(sock->fd, backlog); | |
309 | if (ret < 0) { | |
310 | PERROR("listen inet6"); | |
311 | } | |
312 | ||
313 | end: | |
314 | return ret; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
319 | * API. | |
320 | * | |
321 | * Return the size of received data. | |
322 | */ | |
90e535ef | 323 | LTTNG_HIDDEN |
6364a07a DG |
324 | ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, |
325 | size_t len, int flags) | |
326 | { | |
327 | struct msghdr msg; | |
328 | struct iovec iov[1]; | |
329 | ssize_t ret = -1; | |
7c5aef62 | 330 | size_t len_last; |
1a65bbb8 | 331 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; |
6364a07a DG |
332 | |
333 | memset(&msg, 0, sizeof(msg)); | |
334 | ||
335 | iov[0].iov_base = buf; | |
336 | iov[0].iov_len = len; | |
337 | msg.msg_iov = iov; | |
338 | msg.msg_iovlen = 1; | |
339 | ||
1a65bbb8 | 340 | msg.msg_name = (struct sockaddr *) &addr; |
6364a07a DG |
341 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
342 | ||
6364a07a | 343 | do { |
7c5aef62 | 344 | len_last = iov[0].iov_len; |
6364a07a | 345 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 | 346 | if (ret > 0) { |
5312a3ed JG |
347 | if (flags & MSG_DONTWAIT) { |
348 | goto end; | |
349 | } | |
7c5aef62 DG |
350 | iov[0].iov_base += ret; |
351 | iov[0].iov_len -= ret; | |
a0377dfe | 352 | LTTNG_ASSERT(ret <= len_last); |
7c5aef62 DG |
353 | } |
354 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
6364a07a | 355 | if (ret < 0) { |
7c5aef62 DG |
356 | PERROR("recvmsg inet"); |
357 | } else if (ret > 0) { | |
358 | ret = len; | |
6364a07a | 359 | } |
7c5aef62 | 360 | /* Else ret = 0 meaning an orderly shutdown. */ |
5312a3ed | 361 | end: |
6364a07a DG |
362 | return ret; |
363 | } | |
364 | ||
365 | /* | |
366 | * Send buf data of size len. Using sendmsg API. | |
367 | * | |
368 | * Return the size of sent data. | |
369 | */ | |
90e535ef | 370 | LTTNG_HIDDEN |
c2d69327 | 371 | ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, const void *buf, |
6364a07a DG |
372 | size_t len, int flags) |
373 | { | |
374 | struct msghdr msg; | |
375 | struct iovec iov[1]; | |
376 | ssize_t ret = -1; | |
377 | ||
378 | memset(&msg, 0, sizeof(msg)); | |
379 | ||
c2d69327 | 380 | iov[0].iov_base = (void *) buf; |
6364a07a DG |
381 | iov[0].iov_len = len; |
382 | msg.msg_iov = iov; | |
383 | msg.msg_iovlen = 1; | |
384 | ||
385 | switch (sock->proto) { | |
386 | case LTTCOMM_SOCK_UDP: | |
1a65bbb8 JG |
387 | { |
388 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; | |
389 | ||
390 | msg.msg_name = (struct sockaddr *) &addr; | |
6364a07a DG |
391 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
392 | break; | |
1a65bbb8 | 393 | } |
6364a07a DG |
394 | default: |
395 | break; | |
396 | } | |
397 | ||
398 | do { | |
399 | ret = sendmsg(sock->fd, &msg, flags); | |
400 | } while (ret < 0 && errno == EINTR); | |
401 | if (ret < 0) { | |
402 | /* | |
403 | * Only warn about EPIPE when quiet mode is deactivated. | |
404 | * We consider EPIPE as expected. | |
405 | */ | |
406 | if (errno != EPIPE || !lttng_opt_quiet) { | |
407 | PERROR("sendmsg inet6"); | |
408 | } | |
409 | } | |
410 | ||
411 | return ret; | |
412 | } | |
413 | ||
414 | /* | |
415 | * Shutdown cleanly and close. | |
416 | */ | |
90e535ef | 417 | LTTNG_HIDDEN |
6364a07a DG |
418 | int lttcomm_close_inet6_sock(struct lttcomm_sock *sock) |
419 | { | |
6e742359 | 420 | int ret; |
6364a07a | 421 | |
de5e9086 | 422 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
423 | if (sock->fd == -1) { |
424 | return 0; | |
425 | } | |
426 | ||
6e742359 DG |
427 | ret = close(sock->fd); |
428 | if (ret) { | |
6364a07a DG |
429 | PERROR("close inet6"); |
430 | } | |
431 | ||
432 | /* Mark socket */ | |
433 | sock->fd = -1; | |
434 | ||
435 | return ret; | |
436 | } |