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 <assert.h> |
10 | #include <limits.h> | |
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | #include <sys/stat.h> | |
15 | #include <sys/types.h> | |
16 | #include <unistd.h> | |
a655f4cf | 17 | #include <fcntl.h> |
389fbf04 | 18 | #include <common/compat/time.h> |
a655f4cf | 19 | #include <poll.h> |
6364a07a | 20 | |
90e535ef | 21 | #include <common/common.h> |
395d6b02 | 22 | #include <common/time.h> |
edf4b93e | 23 | #include <common/compat/errno.h> |
6364a07a DG |
24 | |
25 | #include "inet6.h" | |
26 | ||
a655f4cf MD |
27 | #define RECONNECT_DELAY 200 /* ms */ |
28 | ||
6364a07a DG |
29 | /* |
30 | * INET protocol operations. | |
31 | */ | |
32 | static const struct lttcomm_proto_ops inet6_ops = { | |
33 | .bind = lttcomm_bind_inet6_sock, | |
34 | .close = lttcomm_close_inet6_sock, | |
35 | .connect = lttcomm_connect_inet6_sock, | |
36 | .accept = lttcomm_accept_inet6_sock, | |
37 | .listen = lttcomm_listen_inet6_sock, | |
38 | .recvmsg = lttcomm_recvmsg_inet6_sock, | |
39 | .sendmsg = lttcomm_sendmsg_inet6_sock, | |
40 | }; | |
41 | ||
42 | /* | |
43 | * Creates an PF_INET socket. | |
44 | */ | |
90e535ef | 45 | LTTNG_HIDDEN |
6364a07a DG |
46 | int lttcomm_create_inet6_sock(struct lttcomm_sock *sock, int type, int proto) |
47 | { | |
de5e9086 | 48 | int val = 1, ret; |
783a3b9a | 49 | unsigned long timeout; |
6364a07a DG |
50 | |
51 | /* Create server socket */ | |
7b43086d | 52 | if ((sock->fd = socket(PF_INET6, type, proto)) < 0) { |
6364a07a DG |
53 | PERROR("socket inet6"); |
54 | goto error; | |
55 | } | |
56 | ||
57 | sock->ops = &inet6_ops; | |
58 | ||
59 | /* | |
60 | * Set socket option to reuse the address. | |
61 | */ | |
62 | ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int)); | |
63 | if (ret < 0) { | |
64 | PERROR("setsockopt inet6"); | |
65 | goto error; | |
66 | } | |
783a3b9a MD |
67 | timeout = lttcomm_get_network_timeout(); |
68 | if (timeout) { | |
69 | ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout); | |
70 | if (ret) { | |
71 | goto error; | |
72 | } | |
73 | ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout); | |
74 | if (ret) { | |
75 | goto error; | |
76 | } | |
77 | } | |
6364a07a DG |
78 | |
79 | return 0; | |
80 | ||
81 | error: | |
82 | return -1; | |
83 | } | |
84 | ||
85 | /* | |
86 | * Bind socket and return. | |
87 | */ | |
90e535ef | 88 | LTTNG_HIDDEN |
6364a07a DG |
89 | int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock) |
90 | { | |
2288467f | 91 | return bind(sock->fd, |
1a65bbb8 JG |
92 | (const struct sockaddr *) ALIGNED_CONST_PTR( |
93 | sock->sockaddr.addr.sin6), | |
6364a07a | 94 | sizeof(sock->sockaddr.addr.sin6)); |
6364a07a DG |
95 | } |
96 | ||
a655f4cf MD |
97 | static |
98 | int connect_no_timeout(struct lttcomm_sock *sock) | |
99 | { | |
1a65bbb8 JG |
100 | return connect(sock->fd, |
101 | (const struct sockaddr *) ALIGNED_CONST_PTR( | |
102 | sock->sockaddr.addr.sin6), | |
a655f4cf MD |
103 | sizeof(sock->sockaddr.addr.sin6)); |
104 | } | |
105 | ||
a655f4cf MD |
106 | static |
107 | int connect_with_timeout(struct lttcomm_sock *sock) | |
108 | { | |
109 | unsigned long timeout = lttcomm_get_network_timeout(); | |
110 | int ret, flags, connect_ret; | |
111 | struct timespec orig_time, cur_time; | |
2daf6502 | 112 | unsigned long diff_ms; |
a655f4cf MD |
113 | |
114 | ret = fcntl(sock->fd, F_GETFL, 0); | |
115 | if (ret == -1) { | |
116 | PERROR("fcntl"); | |
117 | return -1; | |
118 | } | |
119 | flags = ret; | |
120 | ||
121 | /* Set socket to nonblock */ | |
122 | ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK); | |
123 | if (ret == -1) { | |
124 | PERROR("fcntl"); | |
125 | return -1; | |
126 | } | |
127 | ||
389fbf04 | 128 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time); |
a655f4cf MD |
129 | if (ret == -1) { |
130 | PERROR("clock_gettime"); | |
131 | return -1; | |
132 | } | |
133 | ||
134 | connect_ret = connect(sock->fd, | |
1a65bbb8 JG |
135 | (const struct sockaddr *) ALIGNED_CONST_PTR( |
136 | sock->sockaddr.addr.sin6), | |
137 | sizeof(sock->sockaddr.addr.sin6)); | |
138 | if (connect_ret == -1 && errno != EAGAIN && errno != EWOULDBLOCK && | |
139 | errno != EINPROGRESS) { | |
a655f4cf MD |
140 | goto error; |
141 | } else if (!connect_ret) { | |
142 | /* Connect succeeded */ | |
143 | goto success; | |
144 | } | |
145 | ||
48ac9596 JR |
146 | DBG("Asynchronous connect for sock %d, performing polling with" |
147 | " timeout: %lums", sock->fd, timeout); | |
148 | ||
a655f4cf MD |
149 | /* |
150 | * Perform poll loop following EINPROGRESS recommendation from | |
151 | * connect(2) man page. | |
152 | */ | |
153 | do { | |
154 | struct pollfd fds; | |
155 | ||
156 | fds.fd = sock->fd; | |
157 | fds.events = POLLOUT; | |
158 | fds.revents = 0; | |
159 | ret = poll(&fds, 1, RECONNECT_DELAY); | |
160 | if (ret < 0) { | |
161 | goto error; | |
162 | } else if (ret > 0) { | |
163 | int optval; | |
164 | socklen_t optval_len = sizeof(optval); | |
165 | ||
166 | if (!(fds.revents & POLLOUT)) { | |
167 | /* Either hup or error */ | |
168 | errno = EPIPE; | |
169 | goto error; | |
170 | } | |
171 | /* got something */ | |
172 | ret = getsockopt(sock->fd, SOL_SOCKET, | |
173 | SO_ERROR, &optval, &optval_len); | |
174 | if (ret) { | |
48ac9596 | 175 | PERROR("getsockopt"); |
a655f4cf MD |
176 | goto error; |
177 | } | |
178 | if (!optval) { | |
179 | connect_ret = 0; | |
180 | goto success; | |
181 | } else { | |
48ac9596 JR |
182 | /* Get actual connect() errno from opt_val */ |
183 | errno = optval; | |
a655f4cf MD |
184 | goto error; |
185 | } | |
186 | } | |
187 | /* ret == 0: timeout */ | |
389fbf04 | 188 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time); |
a655f4cf MD |
189 | if (ret == -1) { |
190 | PERROR("clock_gettime"); | |
191 | connect_ret = ret; | |
192 | goto error; | |
193 | } | |
2daf6502 MD |
194 | if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) { |
195 | ERR("timespec_to_ms input overflows milliseconds output"); | |
196 | connect_ret = -1; | |
197 | goto error; | |
198 | } | |
199 | } while (diff_ms < timeout); | |
a655f4cf MD |
200 | |
201 | /* Timeout */ | |
202 | errno = ETIMEDOUT; | |
203 | connect_ret = -1; | |
204 | ||
205 | success: | |
206 | /* Restore initial flags */ | |
207 | ret = fcntl(sock->fd, F_SETFL, flags); | |
208 | if (ret == -1) { | |
209 | PERROR("fcntl"); | |
210 | /* Continue anyway */ | |
211 | } | |
212 | error: | |
213 | return connect_ret; | |
214 | } | |
215 | ||
6364a07a DG |
216 | /* |
217 | * Connect PF_INET socket. | |
218 | */ | |
90e535ef | 219 | LTTNG_HIDDEN |
6364a07a DG |
220 | int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock) |
221 | { | |
222 | int ret, closeret; | |
223 | ||
a655f4cf MD |
224 | if (lttcomm_get_network_timeout()) { |
225 | ret = connect_with_timeout(sock); | |
226 | } else { | |
227 | ret = connect_no_timeout(sock); | |
228 | } | |
6364a07a | 229 | if (ret < 0) { |
82c05d47 | 230 | PERROR("connect inet6"); |
6364a07a DG |
231 | goto error_connect; |
232 | } | |
233 | ||
234 | return ret; | |
235 | ||
236 | error_connect: | |
237 | closeret = close(sock->fd); | |
238 | if (closeret) { | |
239 | PERROR("close inet6"); | |
240 | } | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
247 | * MUST be bind(2) before. | |
248 | */ | |
90e535ef | 249 | LTTNG_HIDDEN |
6364a07a DG |
250 | struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock) |
251 | { | |
252 | int new_fd; | |
88a5db70 | 253 | socklen_t len; |
6364a07a | 254 | struct lttcomm_sock *new_sock; |
1a65bbb8 | 255 | struct sockaddr_in6 new_addr = {}; |
6364a07a DG |
256 | |
257 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
258 | /* | |
259 | * accept(2) does not exist for UDP so simply return the passed socket. | |
260 | */ | |
261 | new_sock = sock; | |
262 | goto end; | |
263 | } | |
264 | ||
de5e9086 | 265 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
266 | if (new_sock == NULL) { |
267 | goto error; | |
268 | } | |
269 | ||
1a65bbb8 | 270 | len = sizeof(new_addr); |
88a5db70 | 271 | |
6364a07a | 272 | /* Blocking call */ |
1a65bbb8 | 273 | new_fd = accept(sock->fd, (struct sockaddr *) &new_addr, &len); |
6364a07a DG |
274 | if (new_fd < 0) { |
275 | PERROR("accept inet6"); | |
276 | goto error; | |
277 | } | |
1a65bbb8 | 278 | new_sock->sockaddr.addr.sin6 = new_addr; |
6364a07a | 279 | new_sock->fd = new_fd; |
de5e9086 | 280 | new_sock->ops = &inet6_ops; |
6364a07a DG |
281 | |
282 | end: | |
283 | return new_sock; | |
284 | ||
285 | error: | |
286 | free(new_sock); | |
287 | return NULL; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
292 | */ | |
90e535ef | 293 | LTTNG_HIDDEN |
6364a07a DG |
294 | int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog) |
295 | { | |
296 | int ret; | |
297 | ||
298 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
299 | /* listen(2) does not exist for UDP so simply return success. */ | |
300 | ret = 0; | |
301 | goto end; | |
302 | } | |
303 | ||
304 | /* Default listen backlog */ | |
305 | if (backlog <= 0) { | |
306 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
307 | } | |
308 | ||
309 | ret = listen(sock->fd, backlog); | |
310 | if (ret < 0) { | |
311 | PERROR("listen inet6"); | |
312 | } | |
313 | ||
314 | end: | |
315 | return ret; | |
316 | } | |
317 | ||
318 | /* | |
319 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
320 | * API. | |
321 | * | |
322 | * Return the size of received data. | |
323 | */ | |
90e535ef | 324 | LTTNG_HIDDEN |
6364a07a DG |
325 | ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, |
326 | size_t len, int flags) | |
327 | { | |
328 | struct msghdr msg; | |
329 | struct iovec iov[1]; | |
330 | ssize_t ret = -1; | |
7c5aef62 | 331 | size_t len_last; |
1a65bbb8 | 332 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; |
6364a07a DG |
333 | |
334 | memset(&msg, 0, sizeof(msg)); | |
335 | ||
336 | iov[0].iov_base = buf; | |
337 | iov[0].iov_len = len; | |
338 | msg.msg_iov = iov; | |
339 | msg.msg_iovlen = 1; | |
340 | ||
1a65bbb8 | 341 | msg.msg_name = (struct sockaddr *) &addr; |
6364a07a DG |
342 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
343 | ||
6364a07a | 344 | do { |
7c5aef62 | 345 | len_last = iov[0].iov_len; |
6364a07a | 346 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 | 347 | if (ret > 0) { |
5312a3ed JG |
348 | if (flags & MSG_DONTWAIT) { |
349 | goto end; | |
350 | } | |
7c5aef62 DG |
351 | iov[0].iov_base += ret; |
352 | iov[0].iov_len -= ret; | |
353 | assert(ret <= len_last); | |
354 | } | |
355 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
6364a07a | 356 | if (ret < 0) { |
7c5aef62 DG |
357 | PERROR("recvmsg inet"); |
358 | } else if (ret > 0) { | |
359 | ret = len; | |
6364a07a | 360 | } |
7c5aef62 | 361 | /* Else ret = 0 meaning an orderly shutdown. */ |
5312a3ed | 362 | end: |
6364a07a DG |
363 | return ret; |
364 | } | |
365 | ||
366 | /* | |
367 | * Send buf data of size len. Using sendmsg API. | |
368 | * | |
369 | * Return the size of sent data. | |
370 | */ | |
90e535ef | 371 | LTTNG_HIDDEN |
c2d69327 | 372 | ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, const void *buf, |
6364a07a DG |
373 | size_t len, int flags) |
374 | { | |
375 | struct msghdr msg; | |
376 | struct iovec iov[1]; | |
377 | ssize_t ret = -1; | |
378 | ||
379 | memset(&msg, 0, sizeof(msg)); | |
380 | ||
c2d69327 | 381 | iov[0].iov_base = (void *) buf; |
6364a07a DG |
382 | iov[0].iov_len = len; |
383 | msg.msg_iov = iov; | |
384 | msg.msg_iovlen = 1; | |
385 | ||
386 | switch (sock->proto) { | |
387 | case LTTCOMM_SOCK_UDP: | |
1a65bbb8 JG |
388 | { |
389 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; | |
390 | ||
391 | msg.msg_name = (struct sockaddr *) &addr; | |
6364a07a DG |
392 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
393 | break; | |
1a65bbb8 | 394 | } |
6364a07a DG |
395 | default: |
396 | break; | |
397 | } | |
398 | ||
399 | do { | |
400 | ret = sendmsg(sock->fd, &msg, flags); | |
401 | } while (ret < 0 && errno == EINTR); | |
402 | if (ret < 0) { | |
403 | /* | |
404 | * Only warn about EPIPE when quiet mode is deactivated. | |
405 | * We consider EPIPE as expected. | |
406 | */ | |
407 | if (errno != EPIPE || !lttng_opt_quiet) { | |
408 | PERROR("sendmsg inet6"); | |
409 | } | |
410 | } | |
411 | ||
412 | return ret; | |
413 | } | |
414 | ||
415 | /* | |
416 | * Shutdown cleanly and close. | |
417 | */ | |
90e535ef | 418 | LTTNG_HIDDEN |
6364a07a DG |
419 | int lttcomm_close_inet6_sock(struct lttcomm_sock *sock) |
420 | { | |
6e742359 | 421 | int ret; |
6364a07a | 422 | |
de5e9086 | 423 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
424 | if (sock->fd == -1) { |
425 | return 0; | |
426 | } | |
427 | ||
6e742359 DG |
428 | ret = close(sock->fd); |
429 | if (ret) { | |
6364a07a DG |
430 | PERROR("close inet6"); |
431 | } | |
432 | ||
433 | /* Mark socket */ | |
434 | sock->fd = -1; | |
435 | ||
436 | return ret; | |
437 | } |