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 |
28ab034a JG |
9 | #include "inet6.hpp" |
10 | ||
11 | #include <common/common.hpp> | |
12 | #include <common/compat/errno.hpp> | |
13 | #include <common/compat/time.hpp> | |
14 | #include <common/time.hpp> | |
15 | ||
16 | #include <fcntl.h> | |
6364a07a | 17 | #include <limits.h> |
28ab034a | 18 | #include <poll.h> |
6364a07a DG |
19 | #include <stdio.h> |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <sys/stat.h> | |
23 | #include <sys/types.h> | |
24 | #include <unistd.h> | |
6364a07a | 25 | |
28ab034a | 26 | #define RECONNECT_DELAY 200 /* ms */ |
a655f4cf | 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 | ||
28ab034a | 92 | static int connect_no_timeout(struct lttcomm_sock *sock) |
a655f4cf | 93 | { |
7966af57 | 94 | struct sockaddr_in6 sockaddr = sock->sockaddr.addr.sin6; |
64efa44e | 95 | return connect(sock->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)); |
a655f4cf MD |
96 | } |
97 | ||
28ab034a | 98 | static int connect_with_timeout(struct lttcomm_sock *sock) |
a655f4cf MD |
99 | { |
100 | unsigned long timeout = lttcomm_get_network_timeout(); | |
101 | int ret, flags, connect_ret; | |
102 | struct timespec orig_time, cur_time; | |
2daf6502 | 103 | unsigned long diff_ms; |
7966af57 | 104 | struct sockaddr_in6 sockaddr; |
a655f4cf MD |
105 | |
106 | ret = fcntl(sock->fd, F_GETFL, 0); | |
107 | if (ret == -1) { | |
108 | PERROR("fcntl"); | |
109 | return -1; | |
110 | } | |
111 | flags = ret; | |
112 | ||
113 | /* Set socket to nonblock */ | |
114 | ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK); | |
115 | if (ret == -1) { | |
116 | PERROR("fcntl"); | |
117 | return -1; | |
118 | } | |
119 | ||
389fbf04 | 120 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time); |
a655f4cf MD |
121 | if (ret == -1) { |
122 | PERROR("clock_gettime"); | |
123 | return -1; | |
124 | } | |
125 | ||
7966af57 | 126 | sockaddr = sock->sockaddr.addr.sin6; |
64efa44e | 127 | connect_ret = connect(sock->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)); |
28ab034a | 128 | if (connect_ret == -1 && errno != EAGAIN && errno != EWOULDBLOCK && errno != EINPROGRESS) { |
a655f4cf MD |
129 | goto error; |
130 | } else if (!connect_ret) { | |
131 | /* Connect succeeded */ | |
132 | goto success; | |
133 | } | |
134 | ||
48ac9596 | 135 | DBG("Asynchronous connect for sock %d, performing polling with" |
28ab034a JG |
136 | " timeout: %lums", |
137 | sock->fd, | |
138 | timeout); | |
48ac9596 | 139 | |
a655f4cf MD |
140 | /* |
141 | * Perform poll loop following EINPROGRESS recommendation from | |
142 | * connect(2) man page. | |
143 | */ | |
144 | do { | |
145 | struct pollfd fds; | |
146 | ||
147 | fds.fd = sock->fd; | |
148 | fds.events = POLLOUT; | |
149 | fds.revents = 0; | |
150 | ret = poll(&fds, 1, RECONNECT_DELAY); | |
151 | if (ret < 0) { | |
152 | goto error; | |
153 | } else if (ret > 0) { | |
154 | int optval; | |
155 | socklen_t optval_len = sizeof(optval); | |
156 | ||
157 | if (!(fds.revents & POLLOUT)) { | |
158 | /* Either hup or error */ | |
159 | errno = EPIPE; | |
160 | goto error; | |
161 | } | |
162 | /* got something */ | |
28ab034a | 163 | ret = getsockopt(sock->fd, SOL_SOCKET, SO_ERROR, &optval, &optval_len); |
a655f4cf | 164 | if (ret) { |
48ac9596 | 165 | PERROR("getsockopt"); |
a655f4cf MD |
166 | goto error; |
167 | } | |
168 | if (!optval) { | |
169 | connect_ret = 0; | |
170 | goto success; | |
171 | } else { | |
48ac9596 JR |
172 | /* Get actual connect() errno from opt_val */ |
173 | errno = optval; | |
a655f4cf MD |
174 | goto error; |
175 | } | |
176 | } | |
177 | /* ret == 0: timeout */ | |
389fbf04 | 178 | ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time); |
a655f4cf MD |
179 | if (ret == -1) { |
180 | PERROR("clock_gettime"); | |
181 | connect_ret = ret; | |
182 | goto error; | |
183 | } | |
2daf6502 MD |
184 | if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) { |
185 | ERR("timespec_to_ms input overflows milliseconds output"); | |
186 | connect_ret = -1; | |
187 | goto error; | |
188 | } | |
189 | } while (diff_ms < timeout); | |
a655f4cf MD |
190 | |
191 | /* Timeout */ | |
192 | errno = ETIMEDOUT; | |
193 | connect_ret = -1; | |
194 | ||
195 | success: | |
196 | /* Restore initial flags */ | |
197 | ret = fcntl(sock->fd, F_SETFL, flags); | |
198 | if (ret == -1) { | |
199 | PERROR("fcntl"); | |
200 | /* Continue anyway */ | |
201 | } | |
202 | error: | |
203 | return connect_ret; | |
204 | } | |
205 | ||
6364a07a DG |
206 | /* |
207 | * Connect PF_INET socket. | |
208 | */ | |
209 | int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock) | |
210 | { | |
211 | int ret, closeret; | |
212 | ||
a655f4cf MD |
213 | if (lttcomm_get_network_timeout()) { |
214 | ret = connect_with_timeout(sock); | |
215 | } else { | |
216 | ret = connect_no_timeout(sock); | |
217 | } | |
6364a07a | 218 | if (ret < 0) { |
82c05d47 | 219 | PERROR("connect inet6"); |
6364a07a DG |
220 | goto error_connect; |
221 | } | |
222 | ||
223 | return ret; | |
224 | ||
225 | error_connect: | |
226 | closeret = close(sock->fd); | |
227 | if (closeret) { | |
228 | PERROR("close inet6"); | |
229 | } | |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Do an accept(2) on the sock and return the new lttcomm socket. The socket | |
236 | * MUST be bind(2) before. | |
237 | */ | |
238 | struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock) | |
239 | { | |
240 | int new_fd; | |
88a5db70 | 241 | socklen_t len; |
6364a07a | 242 | struct lttcomm_sock *new_sock; |
1a65bbb8 | 243 | struct sockaddr_in6 new_addr = {}; |
6364a07a DG |
244 | |
245 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
246 | /* | |
247 | * accept(2) does not exist for UDP so simply return the passed socket. | |
248 | */ | |
249 | new_sock = sock; | |
250 | goto end; | |
251 | } | |
252 | ||
de5e9086 | 253 | new_sock = lttcomm_alloc_sock(sock->proto); |
cd9adb8b | 254 | if (new_sock == nullptr) { |
6364a07a DG |
255 | goto error; |
256 | } | |
257 | ||
1a65bbb8 | 258 | len = sizeof(new_addr); |
88a5db70 | 259 | |
6364a07a | 260 | /* Blocking call */ |
1a65bbb8 | 261 | new_fd = accept(sock->fd, (struct sockaddr *) &new_addr, &len); |
6364a07a DG |
262 | if (new_fd < 0) { |
263 | PERROR("accept inet6"); | |
264 | goto error; | |
265 | } | |
1a65bbb8 | 266 | new_sock->sockaddr.addr.sin6 = new_addr; |
6364a07a | 267 | new_sock->fd = new_fd; |
de5e9086 | 268 | new_sock->ops = &inet6_ops; |
6364a07a DG |
269 | |
270 | end: | |
271 | return new_sock; | |
272 | ||
273 | error: | |
274 | free(new_sock); | |
cd9adb8b | 275 | return nullptr; |
6364a07a DG |
276 | } |
277 | ||
278 | /* | |
279 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
280 | */ | |
281 | int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog) | |
282 | { | |
283 | int ret; | |
284 | ||
285 | if (sock->proto == LTTCOMM_SOCK_UDP) { | |
286 | /* listen(2) does not exist for UDP so simply return success. */ | |
287 | ret = 0; | |
288 | goto end; | |
289 | } | |
290 | ||
291 | /* Default listen backlog */ | |
292 | if (backlog <= 0) { | |
293 | backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN; | |
294 | } | |
295 | ||
296 | ret = listen(sock->fd, backlog); | |
297 | if (ret < 0) { | |
298 | PERROR("listen inet6"); | |
299 | } | |
300 | ||
301 | end: | |
302 | return ret; | |
303 | } | |
304 | ||
305 | /* | |
306 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
307 | * API. | |
308 | * | |
309 | * Return the size of received data. | |
310 | */ | |
28ab034a | 311 | ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf, size_t len, int flags) |
6364a07a DG |
312 | { |
313 | struct msghdr msg; | |
314 | struct iovec iov[1]; | |
315 | ssize_t ret = -1; | |
7c5aef62 | 316 | size_t len_last; |
1a65bbb8 | 317 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; |
6364a07a DG |
318 | |
319 | memset(&msg, 0, sizeof(msg)); | |
320 | ||
321 | iov[0].iov_base = buf; | |
322 | iov[0].iov_len = len; | |
323 | msg.msg_iov = iov; | |
324 | msg.msg_iovlen = 1; | |
325 | ||
1a65bbb8 | 326 | msg.msg_name = (struct sockaddr *) &addr; |
6364a07a DG |
327 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
328 | ||
6364a07a | 329 | do { |
7c5aef62 | 330 | len_last = iov[0].iov_len; |
6364a07a | 331 | ret = recvmsg(sock->fd, &msg, flags); |
7c5aef62 | 332 | if (ret > 0) { |
5312a3ed JG |
333 | if (flags & MSG_DONTWAIT) { |
334 | goto end; | |
335 | } | |
64efa44e | 336 | iov[0].iov_base = ((char *) iov[0].iov_base) + ret; |
7c5aef62 | 337 | iov[0].iov_len -= ret; |
a0377dfe | 338 | LTTNG_ASSERT(ret <= len_last); |
7c5aef62 DG |
339 | } |
340 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
6364a07a | 341 | if (ret < 0) { |
7c5aef62 DG |
342 | PERROR("recvmsg inet"); |
343 | } else if (ret > 0) { | |
344 | ret = len; | |
6364a07a | 345 | } |
7c5aef62 | 346 | /* Else ret = 0 meaning an orderly shutdown. */ |
5312a3ed | 347 | end: |
6364a07a DG |
348 | return ret; |
349 | } | |
350 | ||
351 | /* | |
352 | * Send buf data of size len. Using sendmsg API. | |
353 | * | |
354 | * Return the size of sent data. | |
355 | */ | |
28ab034a JG |
356 | ssize_t |
357 | lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, const void *buf, size_t len, int flags) | |
6364a07a DG |
358 | { |
359 | struct msghdr msg; | |
360 | struct iovec iov[1]; | |
361 | ssize_t ret = -1; | |
362 | ||
363 | memset(&msg, 0, sizeof(msg)); | |
364 | ||
c2d69327 | 365 | iov[0].iov_base = (void *) buf; |
6364a07a DG |
366 | iov[0].iov_len = len; |
367 | msg.msg_iov = iov; | |
368 | msg.msg_iovlen = 1; | |
369 | ||
370 | switch (sock->proto) { | |
371 | case LTTCOMM_SOCK_UDP: | |
1a65bbb8 JG |
372 | { |
373 | struct sockaddr_in6 addr = sock->sockaddr.addr.sin6; | |
374 | ||
375 | msg.msg_name = (struct sockaddr *) &addr; | |
6364a07a DG |
376 | msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6); |
377 | break; | |
1a65bbb8 | 378 | } |
6364a07a DG |
379 | default: |
380 | break; | |
381 | } | |
382 | ||
383 | do { | |
384 | ret = sendmsg(sock->fd, &msg, flags); | |
385 | } while (ret < 0 && errno == EINTR); | |
386 | if (ret < 0) { | |
387 | /* | |
388 | * Only warn about EPIPE when quiet mode is deactivated. | |
389 | * We consider EPIPE as expected. | |
390 | */ | |
391 | if (errno != EPIPE || !lttng_opt_quiet) { | |
392 | PERROR("sendmsg inet6"); | |
393 | } | |
394 | } | |
395 | ||
396 | return ret; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Shutdown cleanly and close. | |
401 | */ | |
402 | int lttcomm_close_inet6_sock(struct lttcomm_sock *sock) | |
403 | { | |
6e742359 | 404 | int ret; |
6364a07a | 405 | |
de5e9086 | 406 | /* Don't try to close an invalid marked socket */ |
6364a07a DG |
407 | if (sock->fd == -1) { |
408 | return 0; | |
409 | } | |
410 | ||
6e742359 DG |
411 | ret = close(sock->fd); |
412 | if (ret) { | |
6364a07a DG |
413 | PERROR("close inet6"); |
414 | } | |
415 | ||
416 | /* Mark socket */ | |
417 | sock->fd = -1; | |
418 | ||
419 | return ret; | |
420 | } |