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