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> |
c9e313bc | 17 | #include <common/compat/time.hpp> |
a655f4cf | 18 | #include <poll.h> |
6364a07a | 19 | |
c9e313bc SM |
20 | #include <common/common.hpp> |
21 | #include <common/time.hpp> | |
22 | #include <common/compat/errno.hpp> | |
6364a07a | 23 | |
c9e313bc | 24 | #include "inet6.hpp" |
6364a07a | 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 | { | |
7966af57 | 88 | struct sockaddr_in6 sockaddr = sock->sockaddr.addr.sin6; |
64efa44e | 89 | return bind(sock->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)); |
6364a07a DG |
90 | } |
91 | ||
a655f4cf MD |
92 | static |
93 | int connect_no_timeout(struct lttcomm_sock *sock) | |
94 | { | |
7966af57 | 95 | struct sockaddr_in6 sockaddr = sock->sockaddr.addr.sin6; |
64efa44e | 96 | return connect(sock->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)); |
a655f4cf MD |
97 | } |
98 | ||
a655f4cf MD |
99 | static |
100 | int connect_with_timeout(struct lttcomm_sock *sock) | |
101 | { | |
102 | unsigned long timeout = lttcomm_get_network_timeout(); | |
103 | int ret, flags, connect_ret; | |
104 | struct timespec orig_time, cur_time; | |
2daf6502 | 105 | unsigned long diff_ms; |
7966af57 | 106 | struct sockaddr_in6 sockaddr; |
a655f4cf MD |
107 | |
108 | ret = fcntl(sock->fd, F_GETFL, 0); | |
109 | if (ret == -1) { | |
110 | PERROR("fcntl"); | |
111 | return -1; | |
112 | } | |
113 | flags = ret; | |
114 | ||
115 | /* Set socket to nonblock */ | |
116 | ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK); | |
117 | if (ret == -1) { | |
118 | PERROR("fcntl"); | |
119 | return -1; | |
120 | } | |
121 | ||
389fbf04 | 122 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time); |
a655f4cf MD |
123 | if (ret == -1) { |
124 | PERROR("clock_gettime"); | |
125 | return -1; | |
126 | } | |
127 | ||
7966af57 | 128 | sockaddr = sock->sockaddr.addr.sin6; |
64efa44e | 129 | connect_ret = connect(sock->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)); |
1a65bbb8 JG |
130 | if (connect_ret == -1 && errno != EAGAIN && errno != EWOULDBLOCK && |
131 | errno != EINPROGRESS) { | |
a655f4cf MD |
132 | goto error; |
133 | } else if (!connect_ret) { | |
134 | /* Connect succeeded */ | |
135 | goto success; | |
136 | } | |
137 | ||
48ac9596 JR |
138 | DBG("Asynchronous connect for sock %d, performing polling with" |
139 | " timeout: %lums", sock->fd, timeout); | |
140 | ||
a655f4cf MD |
141 | /* |
142 | * Perform poll loop following EINPROGRESS recommendation from | |
143 | * connect(2) man page. | |
144 | */ | |
145 | do { | |
146 | struct pollfd fds; | |
147 | ||
148 | fds.fd = sock->fd; | |
149 | fds.events = POLLOUT; | |
150 | fds.revents = 0; | |
151 | ret = poll(&fds, 1, RECONNECT_DELAY); | |
152 | if (ret < 0) { | |
153 | goto error; | |
154 | } else if (ret > 0) { | |
155 | int optval; | |
156 | socklen_t optval_len = sizeof(optval); | |
157 | ||
158 | if (!(fds.revents & POLLOUT)) { | |
159 | /* Either hup or error */ | |
160 | errno = EPIPE; | |
161 | goto error; | |
162 | } | |
163 | /* got something */ | |
164 | ret = getsockopt(sock->fd, SOL_SOCKET, | |
165 | SO_ERROR, &optval, &optval_len); | |
166 | if (ret) { | |
48ac9596 | 167 | PERROR("getsockopt"); |
a655f4cf MD |
168 | goto error; |
169 | } | |
170 | if (!optval) { | |
171 | connect_ret = 0; | |
172 | goto success; | |
173 | } else { | |
48ac9596 JR |
174 | /* Get actual connect() errno from opt_val */ |
175 | errno = optval; | |
a655f4cf MD |
176 | goto error; |
177 | } | |
178 | } | |
179 | /* ret == 0: timeout */ | |
389fbf04 | 180 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time); |
a655f4cf MD |
181 | if (ret == -1) { |
182 | PERROR("clock_gettime"); | |
183 | connect_ret = ret; | |
184 | goto error; | |
185 | } | |
2daf6502 MD |
186 | if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) { |
187 | ERR("timespec_to_ms input overflows milliseconds output"); | |
188 | connect_ret = -1; | |
189 | goto error; | |
190 | } | |
191 | } while (diff_ms < timeout); | |
a655f4cf MD |
192 | |
193 | /* Timeout */ | |
194 | errno = ETIMEDOUT; | |
195 | connect_ret = -1; | |
196 | ||
197 | success: | |
198 | /* Restore initial flags */ | |
199 | ret = fcntl(sock->fd, F_SETFL, flags); | |
200 | if (ret == -1) { | |
201 | PERROR("fcntl"); | |
202 | /* Continue anyway */ | |
203 | } | |
204 | error: | |
205 | return connect_ret; | |
206 | } | |
207 | ||
6364a07a DG |
208 | /* |
209 | * Connect PF_INET socket. | |
210 | */ | |
211 | int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock) | |
212 | { | |
213 | int ret, closeret; | |
214 | ||
a655f4cf MD |
215 | if (lttcomm_get_network_timeout()) { |
216 | ret = connect_with_timeout(sock); | |
217 | } else { | |
218 | ret = connect_no_timeout(sock); | |
219 | } | |
6364a07a | 220 | if (ret < 0) { |
82c05d47 | 221 | PERROR("connect inet6"); |
6364a07a DG |
222 | goto error_connect; |
223 | } | |
224 | ||
225 | return ret; | |
226 | ||
227 | error_connect: | |
228 | closeret = close(sock->fd); | |
229 | if (closeret) { | |
230 | PERROR("close inet6"); | |
231 | } | |
232 | ||
233 | return ret; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
238 | * MUST be bind(2) before. | |
239 | */ | |
240 | struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock) | |
241 | { | |
242 | int new_fd; | |
88a5db70 | 243 | socklen_t len; |
6364a07a | 244 | struct lttcomm_sock *new_sock; |
1a65bbb8 | 245 | struct sockaddr_in6 new_addr = {}; |
6364a07a DG |
246 | |
247 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
248 | /* | |
249 | * accept(2) does not exist for UDP so simply return the passed socket. | |
250 | */ | |
251 | new_sock = sock; | |
252 | goto end; | |
253 | } | |
254 | ||
de5e9086 | 255 | new_sock = lttcomm_alloc_sock(sock->proto); |
6364a07a DG |
256 | if (new_sock == NULL) { |
257 | goto error; | |
258 | } | |
259 | ||
1a65bbb8 | 260 | len = sizeof(new_addr); |
88a5db70 | 261 | |
6364a07a | 262 | /* Blocking call */ |
1a65bbb8 | 263 | new_fd = accept(sock->fd, (struct sockaddr *) &new_addr, &len); |
6364a07a DG |
264 | if (new_fd < 0) { |
265 | PERROR("accept inet6"); | |
266 | goto error; | |
267 | } | |
1a65bbb8 | 268 | new_sock->sockaddr.addr.sin6 = new_addr; |
6364a07a | 269 | new_sock->fd = new_fd; |
de5e9086 | 270 | new_sock->ops = &inet6_ops; |
6364a07a DG |
271 | |
272 | end: | |
273 | return new_sock; | |
274 | ||
275 | error: | |
276 | free(new_sock); | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
282 | */ | |
283 | int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog) | |
284 | { | |
285 | int ret; | |
286 | ||
287 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
288 | /* listen(2) does not exist for UDP so simply return success. */ | |
289 | ret = 0; | |
290 | goto end; | |
291 | } | |
292 | ||
293 | /* Default listen backlog */ | |
294 | if (backlog <= 0) { | |
295 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
296 | } | |
297 | ||
298 | ret = listen(sock->fd, backlog); | |
299 | if (ret < 0) { | |
300 | PERROR("listen inet6"); | |
301 | } | |
302 | ||
303 | end: | |
304 | return ret; | |
305 | } | |
306 | ||
307 | /* | |
308 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
309 | * API. | |
310 | * | |
311 | * Return the size of received data. | |
312 | */ | |
313 | ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, | |
314 | size_t len, int flags) | |
315 | { | |
316 | struct msghdr msg; | |
317 | struct iovec iov[1]; | |
318 | ssize_t ret = -1; | |
7c5aef62 | 319 | size_t len_last; |
1a65bbb8 | 320 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; |
6364a07a DG |
321 | |
322 | memset(&msg, 0, sizeof(msg)); | |
323 | ||
324 | iov[0].iov_base = buf; | |
325 | iov[0].iov_len = len; | |
326 | msg.msg_iov = iov; | |
327 | msg.msg_iovlen = 1; | |
328 | ||
1a65bbb8 | 329 | msg.msg_name = (struct sockaddr *) &addr; |
6364a07a DG |
330 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
331 | ||
6364a07a | 332 | do { |
7c5aef62 | 333 | len_last = iov[0].iov_len; |
6364a07a | 334 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 | 335 | if (ret > 0) { |
5312a3ed JG |
336 | if (flags & MSG_DONTWAIT) { |
337 | goto end; | |
338 | } | |
64efa44e | 339 | iov[0].iov_base = ((char *) iov[0].iov_base) + ret; |
7c5aef62 | 340 | iov[0].iov_len -= ret; |
a0377dfe | 341 | LTTNG_ASSERT(ret <= len_last); |
7c5aef62 DG |
342 | } |
343 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
6364a07a | 344 | if (ret < 0) { |
7c5aef62 DG |
345 | PERROR("recvmsg inet"); |
346 | } else if (ret > 0) { | |
347 | ret = len; | |
6364a07a | 348 | } |
7c5aef62 | 349 | /* Else ret = 0 meaning an orderly shutdown. */ |
5312a3ed | 350 | end: |
6364a07a DG |
351 | return ret; |
352 | } | |
353 | ||
354 | /* | |
355 | * Send buf data of size len. Using sendmsg API. | |
356 | * | |
357 | * Return the size of sent data. | |
358 | */ | |
c2d69327 | 359 | ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, const void *buf, |
6364a07a DG |
360 | size_t len, int flags) |
361 | { | |
362 | struct msghdr msg; | |
363 | struct iovec iov[1]; | |
364 | ssize_t ret = -1; | |
365 | ||
366 | memset(&msg, 0, sizeof(msg)); | |
367 | ||
c2d69327 | 368 | iov[0].iov_base = (void *) buf; |
6364a07a DG |
369 | iov[0].iov_len = len; |
370 | msg.msg_iov = iov; | |
371 | msg.msg_iovlen = 1; | |
372 | ||
373 | switch (sock->proto) { | |
374 | case LTTCOMM_SOCK_UDP: | |
1a65bbb8 JG |
375 | { |
376 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; | |
377 | ||
378 | msg.msg_name = (struct sockaddr *) &addr; | |
6364a07a DG |
379 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
380 | break; | |
1a65bbb8 | 381 | } |
6364a07a DG |
382 | default: |
383 | break; | |
384 | } | |
385 | ||
386 | do { | |
387 | ret = sendmsg(sock->fd, &msg, flags); | |
388 | } while (ret < 0 && errno == EINTR); | |
389 | if (ret < 0) { | |
390 | /* | |
391 | * Only warn about EPIPE when quiet mode is deactivated. | |
392 | * We consider EPIPE as expected. | |
393 | */ | |
394 | if (errno != EPIPE || !lttng_opt_quiet) { | |
395 | PERROR("sendmsg inet6"); | |
396 | } | |
397 | } | |
398 | ||
399 | return ret; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Shutdown cleanly and close. | |
404 | */ | |
405 | int lttcomm_close_inet6_sock(struct lttcomm_sock *sock) | |
406 | { | |
6e742359 | 407 | int ret; |
6364a07a | 408 | |
de5e9086 | 409 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
410 | if (sock->fd == -1) { |
411 | return 0; | |
412 | } | |
413 | ||
6e742359 DG |
414 | ret = close(sock->fd); |
415 | if (ret) { | |
6364a07a DG |
416 | PERROR("close inet6"); |
417 | } | |
418 | ||
419 | /* Mark socket */ | |
420 | sock->fd = -1; | |
421 | ||
422 | return ret; | |
423 | } |