Fix: warning 'fd' may be used uninitialized
[lttng-tools.git] / src / common / unix.c
CommitLineData
0d37f2bc
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
6c1c0768 19#define _LGPL_SOURCE
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20#include <assert.h>
21#include <limits.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <sys/stat.h>
26#include <sys/types.h>
27#include <unistd.h>
28#include <errno.h>
29
90e535ef 30#include <common/common.h>
2038dd6c 31#include <common/sessiond-comm/sessiond-comm.h>
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32
33#include "unix.h"
34
35/*
36 * Connect to unix socket using the path name.
37 */
90e535ef 38LTTNG_HIDDEN
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39int lttcomm_connect_unix_sock(const char *pathname)
40{
665886a6 41 struct sockaddr_un s_un;
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42 int fd, ret, closeret;
43
7f8bf467
JG
44 if (strlen(pathname) >= sizeof(s_un.sun_path)) {
45 ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).",
46 pathname, strlen(pathname) + 1,
47 sizeof(s_un.sun_path));
48 ret = -ENAMETOOLONG;
49 goto error;
50 }
51
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52 fd = socket(PF_UNIX, SOCK_STREAM, 0);
53 if (fd < 0) {
54 PERROR("socket");
55 ret = fd;
56 goto error;
57 }
58
665886a6
MJ
59 memset(&s_un, 0, sizeof(s_un));
60 s_un.sun_family = AF_UNIX;
61 strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path));
62 s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0';
0d37f2bc 63
665886a6 64 ret = connect(fd, (struct sockaddr *) &s_un, sizeof(s_un));
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DG
65 if (ret < 0) {
66 /*
67 * Don't print message on connect error, because connect is used in
68 * normal execution to detect if sessiond is alive.
69 */
70 goto error_connect;
71 }
72
73 return fd;
74
75error_connect:
76 closeret = close(fd);
77 if (closeret) {
78 PERROR("close");
79 }
80error:
81 return ret;
82}
83
84/*
85 * Do an accept(2) on the sock and return the new file descriptor. The socket
86 * MUST be bind(2) before.
87 */
90e535ef 88LTTNG_HIDDEN
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89int lttcomm_accept_unix_sock(int sock)
90{
91 int new_fd;
665886a6 92 struct sockaddr_un s_un;
50786a72 93 socklen_t len = sizeof(s_un);
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94
95 /* Blocking call */
665886a6 96 new_fd = accept(sock, (struct sockaddr *) &s_un, &len);
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97 if (new_fd < 0) {
98 PERROR("accept");
99 }
100
101 return new_fd;
102}
103
7567352f
MD
104LTTNG_HIDDEN
105int lttcomm_create_anon_unix_socketpair(int *fds)
106{
107 if (socketpair(PF_UNIX, SOCK_STREAM, 0, fds) < 0) {
108 PERROR("socketpair");
109 return -1;
110 }
111 return 0;
112}
113
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114/*
115 * Creates a AF_UNIX local socket using pathname bind the socket upon creation
116 * and return the fd.
117 */
90e535ef 118LTTNG_HIDDEN
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119int lttcomm_create_unix_sock(const char *pathname)
120{
665886a6 121 struct sockaddr_un s_un;
7f8bf467 122 int fd = -1;
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123 int ret = -1;
124
7f8bf467
JG
125 if (strlen(pathname) >= sizeof(s_un.sun_path)) {
126 ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).",
127 pathname, strlen(pathname) + 1,
128 sizeof(s_un.sun_path));
129 ret = -ENAMETOOLONG;
130 goto error;
131 }
132
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133 /* Create server socket */
134 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
135 PERROR("socket");
136 goto error;
137 }
138
665886a6
MJ
139 memset(&s_un, 0, sizeof(s_un));
140 s_un.sun_family = AF_UNIX;
141 strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path));
142 s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0';
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143
144 /* Unlink the old file if present */
145 (void) unlink(pathname);
665886a6 146 ret = bind(fd, (struct sockaddr *) &s_un, sizeof(s_un));
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147 if (ret < 0) {
148 PERROR("bind");
149 goto error;
150 }
151
152 return fd;
153
154error:
17e75273
DG
155 if (fd >= 0) {
156 if (close(fd) < 0) {
157 PERROR("close create unix sock");
158 }
159 }
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160 return ret;
161}
162
163/*
164 * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
165 */
90e535ef 166LTTNG_HIDDEN
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167int lttcomm_listen_unix_sock(int sock)
168{
169 int ret;
170
171 ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN);
172 if (ret < 0) {
173 PERROR("listen");
174 }
175
176 return ret;
177}
178
179/*
180 * Receive data of size len in put that data into the buf param. Using recvmsg
181 * API.
182 *
183 * Return the size of received data.
184 */
90e535ef 185LTTNG_HIDDEN
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186ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
187{
188 struct msghdr msg;
189 struct iovec iov[1];
190 ssize_t ret = -1;
7c5aef62 191 size_t len_last;
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192
193 memset(&msg, 0, sizeof(msg));
194
195 iov[0].iov_base = buf;
196 iov[0].iov_len = len;
197 msg.msg_iov = iov;
198 msg.msg_iovlen = 1;
199
200 do {
7c5aef62 201 len_last = iov[0].iov_len;
fbb1fd3a 202 ret = lttng_recvmsg_nosigpipe(sock, &msg);
7c5aef62
DG
203 if (ret > 0) {
204 iov[0].iov_base += ret;
205 iov[0].iov_len -= ret;
206 assert(ret <= len_last);
207 }
208 } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
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209 if (ret < 0) {
210 PERROR("recvmsg");
7c5aef62
DG
211 } else if (ret > 0) {
212 ret = len;
0d37f2bc 213 }
7c5aef62 214 /* Else ret = 0 meaning an orderly shutdown. */
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215
216 return ret;
217}
218
c72435ad
JG
219/*
220 * Receive data of size len in put that data into the buf param. Using recvmsg
221 * API. Only use with sockets set in non-blocking mode.
222 *
223 * Return the size of received data.
224 */
225LTTNG_HIDDEN
226ssize_t lttcomm_recv_unix_sock_non_block(int sock, void *buf, size_t len)
227{
228 struct msghdr msg;
229 struct iovec iov[1];
230 ssize_t ret;
231
232 memset(&msg, 0, sizeof(msg));
233
234 iov[0].iov_base = buf;
235 iov[0].iov_len = len;
236 msg.msg_iov = iov;
237 msg.msg_iovlen = 1;
238
239retry:
240 ret = lttng_recvmsg_nosigpipe(sock, &msg);
241 if (ret < 0) {
242 if (errno == EINTR) {
243 goto retry;
244 } else {
245 /*
246 * Only warn about EPIPE when quiet mode is
247 * deactivated.
248 * We consider EPIPE as expected.
249 */
250 if (errno != EPIPE || !lttng_opt_quiet) {
251 PERROR("recvmsg");
252 }
253 goto end;
254 }
255 }
256 ret = len;
257end:
258 return ret;
259}
260
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261/*
262 * Send buf data of size len. Using sendmsg API.
263 *
264 * Return the size of sent data.
265 */
90e535ef 266LTTNG_HIDDEN
c2d69327 267ssize_t lttcomm_send_unix_sock(int sock, const void *buf, size_t len)
0d37f2bc
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268{
269 struct msghdr msg;
270 struct iovec iov[1];
c72435ad 271 ssize_t ret;
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272
273 memset(&msg, 0, sizeof(msg));
274
c2d69327 275 iov[0].iov_base = (void *) buf;
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276 iov[0].iov_len = len;
277 msg.msg_iov = iov;
278 msg.msg_iovlen = 1;
279
c72435ad
JG
280 while (iov[0].iov_len) {
281 ret = sendmsg(sock, &msg, 0);
282 if (ret < 0) {
283 if (errno == EINTR) {
284 continue;
285 } else {
286 /*
287 * Only warn about EPIPE when quiet mode is
288 * deactivated.
289 * We consider EPIPE as expected.
290 */
291 if (errno != EPIPE || !lttng_opt_quiet) {
292 PERROR("sendmsg");
293 }
294 goto end;
295 }
296 }
297 iov[0].iov_len -= ret;
298 iov[0].iov_base += ret;
299 }
300 ret = len;
301end:
302 return ret;
303}
304
305/*
306 * Send buf data of size len. Using sendmsg API.
307 * Only use with non-blocking sockets. The difference with the blocking version
308 * of the function is that this one does not retry to send on partial sends,
309 * except if the interruption was caused by a signal (EINTR).
310 *
311 * Return the size of sent data.
312 */
313LTTNG_HIDDEN
314ssize_t lttcomm_send_unix_sock_non_block(int sock, const void *buf, size_t len)
315{
316 struct msghdr msg;
317 struct iovec iov[1];
318 ssize_t ret;
319
320 memset(&msg, 0, sizeof(msg));
321
322 iov[0].iov_base = (void *) buf;
323 iov[0].iov_len = len;
324 msg.msg_iov = iov;
325 msg.msg_iovlen = 1;
326
327retry:
0d37f2bc
DG
328 ret = sendmsg(sock, &msg, 0);
329 if (ret < 0) {
c72435ad
JG
330 if (errno == EINTR) {
331 goto retry;
332 } else {
333 /*
334 * Only warn about EPIPE when quiet mode is
335 * deactivated.
336 * We consider EPIPE as expected.
337 */
338 if (errno != EPIPE || !lttng_opt_quiet) {
339 PERROR("sendmsg");
340 }
341 goto end;
0d37f2bc
DG
342 }
343 }
c72435ad
JG
344 ret = len;
345end:
0d37f2bc
DG
346 return ret;
347}
348
349/*
350 * Shutdown cleanly a unix socket.
351 */
90e535ef 352LTTNG_HIDDEN
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353int lttcomm_close_unix_sock(int sock)
354{
355 int ret, closeret;
356
357 /* Shutdown receptions and transmissions */
358 ret = shutdown(sock, SHUT_RDWR);
359 if (ret < 0) {
360 PERROR("shutdown");
361 }
362
363 closeret = close(sock);
364 if (closeret) {
365 PERROR("close");
366 }
367
368 return ret;
369}
370
371/*
372 * Send a message accompanied by fd(s) over a unix socket.
373 *
374 * Returns the size of data sent, or negative error value.
375 */
90e535ef 376LTTNG_HIDDEN
ac2f30af 377ssize_t lttcomm_send_fds_unix_sock(int sock, const int *fds, size_t nb_fd)
0d37f2bc
DG
378{
379 struct msghdr msg;
380 struct cmsghdr *cmptr;
381 struct iovec iov[1];
382 ssize_t ret = -1;
383 unsigned int sizeof_fds = nb_fd * sizeof(int);
384 char tmp[CMSG_SPACE(sizeof_fds)];
385 char dummy = 0;
386
387 memset(&msg, 0, sizeof(msg));
b3f35e02 388 memset(tmp, 0, sizeof(tmp));
0d37f2bc
DG
389
390 if (nb_fd > LTTCOMM_MAX_SEND_FDS)
391 return -EINVAL;
392
393 msg.msg_control = (caddr_t)tmp;
394 msg.msg_controllen = CMSG_LEN(sizeof_fds);
395
396 cmptr = CMSG_FIRSTHDR(&msg);
1d8d0328
MJ
397 if (!cmptr) {
398 return -1;
399 }
b3f35e02 400
0d37f2bc
DG
401 cmptr->cmsg_level = SOL_SOCKET;
402 cmptr->cmsg_type = SCM_RIGHTS;
403 cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
404 memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
405 /* Sum of the length of all control messages in the buffer: */
406 msg.msg_controllen = cmptr->cmsg_len;
407
408 iov[0].iov_base = &dummy;
409 iov[0].iov_len = 1;
410 msg.msg_iov = iov;
411 msg.msg_iovlen = 1;
412
413 do {
414 ret = sendmsg(sock, &msg, 0);
415 } while (ret < 0 && errno == EINTR);
416 if (ret < 0) {
417 /*
418 * Only warn about EPIPE when quiet mode is deactivated.
419 * We consider EPIPE as expected.
420 */
421 if (errno != EPIPE || !lttng_opt_quiet) {
422 PERROR("sendmsg");
423 }
424 }
425 return ret;
426}
427
428/*
429 * Recv a message accompanied by fd(s) from a unix socket.
430 *
431 * Returns the size of received data, or negative error value.
432 *
433 * Expect at most "nb_fd" file descriptors. Returns the number of fd
434 * actually received in nb_fd.
435 */
90e535ef 436LTTNG_HIDDEN
0d37f2bc
DG
437ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
438{
439 struct iovec iov[1];
440 ssize_t ret = 0;
441 struct cmsghdr *cmsg;
442 size_t sizeof_fds = nb_fd * sizeof(int);
b3f35e02
FD
443
444 /* Account for the struct ucred cmsg in the buffer size */
445 char recv_buf[CMSG_SPACE(sizeof_fds) + CMSG_SPACE(sizeof(struct ucred))];
0d37f2bc
DG
446 struct msghdr msg;
447 char dummy;
448
449 memset(&msg, 0, sizeof(msg));
450
451 /* Prepare to receive the structures */
452 iov[0].iov_base = &dummy;
453 iov[0].iov_len = 1;
454 msg.msg_iov = iov;
455 msg.msg_iovlen = 1;
b3f35e02
FD
456
457 cmsg = (struct cmsghdr *) recv_buf;
458 cmsg->cmsg_len = CMSG_LEN(sizeof_fds);
459 cmsg->cmsg_level = SOL_SOCKET;
460 cmsg->cmsg_type = SCM_RIGHTS;
461
462 msg.msg_control = cmsg;
463 msg.msg_controllen = CMSG_LEN(sizeof(recv_buf));
464 msg.msg_flags = 0;
0d37f2bc
DG
465
466 do {
467 ret = recvmsg(sock, &msg, 0);
468 } while (ret < 0 && errno == EINTR);
469 if (ret < 0) {
470 PERROR("recvmsg fds");
471 goto end;
472 }
b3f35e02 473
0d37f2bc
DG
474 if (ret != 1) {
475 fprintf(stderr, "Error: Received %zd bytes, expected %d\n",
476 ret, 1);
477 goto end;
478 }
b3f35e02 479
0d37f2bc
DG
480 if (msg.msg_flags & MSG_CTRUNC) {
481 fprintf(stderr, "Error: Control message truncated.\n");
482 ret = -1;
483 goto end;
484 }
b3f35e02
FD
485
486 /*
487 * If the socket was configured with SO_PASSCRED, the kernel will add a
488 * control message (cmsg) to the ancillary data of the unix socket. We
489 * need to expect a cmsg of the SCM_CREDENTIALS as the first control
490 * message.
491 */
492 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
b3f35e02
FD
493 if (cmsg->cmsg_level != SOL_SOCKET) {
494 fprintf(stderr, "Error: The socket needs to be of type SOL_SOCKET\n");
495 ret = -1;
496 goto end;
497 }
498 if (cmsg->cmsg_type == SCM_RIGHTS) {
499 /*
500 * We found the controle message for file descriptors,
501 * now copy the fds to the fds ptr and return success.
502 */
503 if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
504 fprintf(stderr, "Error: Received %zu bytes of"
505 "ancillary data for FDs, expected %zu\n",
506 (size_t) cmsg->cmsg_len,
507 (size_t) CMSG_LEN(sizeof_fds));
508 ret = -1;
509 goto end;
510 }
511 memcpy(fds, CMSG_DATA(cmsg), sizeof_fds);
512 ret = sizeof_fds;
513 goto end;
514 }
515 if (cmsg->cmsg_type == SCM_CREDENTIALS) {
516 /*
517 * Expect credentials to be sent when expecting fds even
518 * if no credential were include in the send(). The
519 * kernel adds them...
520 */
b3f35e02
FD
521 ret = -1;
522 }
0d37f2bc 523 }
0d37f2bc
DG
524end:
525 return ret;
526}
527
528/*
529 * Send a message with credentials over a unix socket.
530 *
531 * Returns the size of data sent, or negative error value.
532 */
90e535ef 533LTTNG_HIDDEN
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DG
534ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
535{
536 struct msghdr msg;
537 struct iovec iov[1];
538 ssize_t ret = -1;
539#ifdef __linux__
540 struct cmsghdr *cmptr;
541 size_t sizeof_cred = sizeof(lttng_sock_cred);
542 char anc_buf[CMSG_SPACE(sizeof_cred)];
543 lttng_sock_cred *creds;
8bbffd54
MJ
544
545 memset(anc_buf, 0, CMSG_SPACE(sizeof_cred) * sizeof(char));
0d37f2bc
DG
546#endif /* __linux__ */
547
548 memset(&msg, 0, sizeof(msg));
549
550 iov[0].iov_base = buf;
551 iov[0].iov_len = len;
552 msg.msg_iov = iov;
553 msg.msg_iovlen = 1;
554
555#ifdef __linux__
556 msg.msg_control = (caddr_t) anc_buf;
557 msg.msg_controllen = CMSG_LEN(sizeof_cred);
558
559 cmptr = CMSG_FIRSTHDR(&msg);
1d8d0328
MJ
560 if (!cmptr) {
561 return -1;
562 }
0d37f2bc
DG
563 cmptr->cmsg_level = SOL_SOCKET;
564 cmptr->cmsg_type = LTTNG_SOCK_CREDS;
565 cmptr->cmsg_len = CMSG_LEN(sizeof_cred);
566
567 creds = (lttng_sock_cred*) CMSG_DATA(cmptr);
568
569 LTTNG_SOCK_SET_UID_CRED(creds, geteuid());
570 LTTNG_SOCK_SET_GID_CRED(creds, getegid());
571 LTTNG_SOCK_SET_PID_CRED(creds, getpid());
572#endif /* __linux__ */
573
574 do {
575 ret = sendmsg(sock, &msg, 0);
576 } while (ret < 0 && errno == EINTR);
577 if (ret < 0) {
578 /*
579 * Only warn about EPIPE when quiet mode is deactivated.
580 * We consider EPIPE as expected.
581 */
582 if (errno != EPIPE || !lttng_opt_quiet) {
583 PERROR("sendmsg");
584 }
585 }
586 return ret;
587}
588
589/*
590 * Recv a message accompanied with credentials from a unix socket.
591 *
592 * Returns the size of received data, or negative error value.
593 */
90e535ef 594LTTNG_HIDDEN
0d37f2bc
DG
595ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
596 lttng_sock_cred *creds)
597{
598 struct msghdr msg;
599 struct iovec iov[1];
600 ssize_t ret;
4100e49a 601 size_t len_last;
0d37f2bc
DG
602#ifdef __linux__
603 struct cmsghdr *cmptr;
604 size_t sizeof_cred = sizeof(lttng_sock_cred);
605 char anc_buf[CMSG_SPACE(sizeof_cred)];
606#endif /* __linux__ */
607
608 memset(&msg, 0, sizeof(msg));
609
610 /* Not allowed */
611 if (creds == NULL) {
612 ret = -1;
613 goto end;
614 }
615
616 /* Prepare to receive the structures */
617 iov[0].iov_base = buf;
618 iov[0].iov_len = len;
619 msg.msg_iov = iov;
620 msg.msg_iovlen = 1;
621
622#ifdef __linux__
623 msg.msg_control = anc_buf;
624 msg.msg_controllen = sizeof(anc_buf);
625#endif /* __linux__ */
626
627 do {
4100e49a 628 len_last = iov[0].iov_len;
0d37f2bc 629 ret = recvmsg(sock, &msg, 0);
4100e49a
DG
630 if (ret > 0) {
631 iov[0].iov_base += ret;
632 iov[0].iov_len -= ret;
633 assert(ret <= len_last);
634 }
635 } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
0d37f2bc
DG
636 if (ret < 0) {
637 PERROR("recvmsg fds");
638 goto end;
4100e49a
DG
639 } else if (ret > 0) {
640 ret = len;
0d37f2bc 641 }
4100e49a 642 /* Else ret = 0 meaning an orderly shutdown. */
0d37f2bc
DG
643
644#ifdef __linux__
645 if (msg.msg_flags & MSG_CTRUNC) {
646 fprintf(stderr, "Error: Control message truncated.\n");
647 ret = -1;
648 goto end;
649 }
650
651 cmptr = CMSG_FIRSTHDR(&msg);
652 if (cmptr == NULL) {
653 fprintf(stderr, "Error: Invalid control message header\n");
654 ret = -1;
655 goto end;
656 }
657
658 if (cmptr->cmsg_level != SOL_SOCKET ||
659 cmptr->cmsg_type != LTTNG_SOCK_CREDS) {
660 fprintf(stderr, "Didn't received any credentials\n");
661 ret = -1;
662 goto end;
663 }
664
665 if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) {
666 fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n",
667 (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred));
668 ret = -1;
669 goto end;
670 }
671
672 memcpy(creds, CMSG_DATA(cmptr), sizeof_cred);
bfa419e4 673#elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__) || defined(__APPLE__))
0d37f2bc
DG
674 {
675 int peer_ret;
676
677 peer_ret = getpeereid(sock, &creds->uid, &creds->gid);
678 if (peer_ret != 0) {
679 return peer_ret;
680 }
681 }
682#else
683#error "Please implement credential support for your OS."
684#endif /* __linux__ */
685
686end:
687 return ret;
688}
689
690/*
691 * Set socket option to use credentials passing.
692 */
693#ifdef __linux__
90e535ef 694LTTNG_HIDDEN
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695int lttcomm_setsockopt_creds_unix_sock(int sock)
696{
697 int ret, on = 1;
698
699 /* Set socket for credentials retrieval */
700 ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
701 if (ret < 0) {
702 PERROR("setsockopt creds unix sock");
703 }
704 return ret;
705}
bfa419e4 706#elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__) || defined(__APPLE__))
90e535ef 707LTTNG_HIDDEN
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708int lttcomm_setsockopt_creds_unix_sock(int sock)
709{
710 return 0;
711}
712#else
713#error "Please implement credential support for your OS."
714#endif /* __linux__ */
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