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build:dist: call build-manpages-nogit for make dist and package generated files
[Samba/gebeck_regimport.git] / source3 / lib / util_sock.c
blob7fcb9c4c96afcf897f5fe52d33ee5667c70d1644
1 /*
2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Tim Potter 2000-2001
6 Copyright (C) Jeremy Allison 1992-2007
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "system/filesys.h"
24 #include "memcache.h"
25 #include "../lib/async_req/async_sock.h"
26 #include "../lib/util/select.h"
27 #include "lib/socket/interfaces.h"
28 #include "../lib/util/tevent_unix.h"
29 #include "../lib/util/tevent_ntstatus.h"
30 #include "../lib/tsocket/tsocket.h"
31
32 const char *client_name(int fd)
33 {
34 return get_peer_name(fd,false);
35 }
36
37 const char *client_addr(int fd, char *addr, size_t addrlen)
38 {
39 return get_peer_addr(fd,addr,addrlen);
40 }
41
42 #if 0
43 /* Not currently used. JRA. */
44 int client_socket_port(int fd)
45 {
46 return get_socket_port(fd);
47 }
48 #endif
49
50 /****************************************************************************
51 Determine if a file descriptor is in fact a socket.
52 ****************************************************************************/
53
54 bool is_a_socket(int fd)
55 {
56 int v;
57 socklen_t l;
58 l = sizeof(int);
59 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
60 }
61
62 /****************************************************************************
63 Read from a socket.
64 ****************************************************************************/
65
66 ssize_t read_udp_v4_socket(int fd,
67 char *buf,
68 size_t len,
69 struct sockaddr_storage *psa)
70 {
71 ssize_t ret;
72 socklen_t socklen = sizeof(*psa);
73 struct sockaddr_in *si = (struct sockaddr_in *)psa;
74
75 memset((char *)psa,'\0',socklen);
76
77 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
78 (struct sockaddr *)psa,&socklen);
79 if (ret <= 0) {
80 /* Don't print a low debug error for a non-blocking socket. */
81 if (errno == EAGAIN) {
82 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
83 } else {
84 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
85 strerror(errno)));
86 }
87 return 0;
88 }
89
90 if (psa->ss_family != AF_INET) {
91 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
92 "(not IPv4)\n", (int)psa->ss_family));
93 return 0;
94 }
95
96 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
97 inet_ntoa(si->sin_addr),
98 si->sin_port,
99 (unsigned long)ret));
100
101 return ret;
102 }
103
104 /****************************************************************************
105 Read data from a file descriptor with a timout in msec.
106 mincount = if timeout, minimum to read before returning
107 maxcount = number to be read.
108 time_out = timeout in milliseconds
109 NB. This can be called with a non-socket fd, don't change
110 sys_read() to sys_recv() or other socket call.
111 ****************************************************************************/
112
113 NTSTATUS read_fd_with_timeout(int fd, char *buf,
114 size_t mincnt, size_t maxcnt,
115 unsigned int time_out,
116 size_t *size_ret)
117 {
118 int pollrtn;
119 ssize_t readret;
120 size_t nread = 0;
121
122 /* just checking .... */
123 if (maxcnt <= 0)
124 return NT_STATUS_OK;
125
126 /* Blocking read */
127 if (time_out == 0) {
128 if (mincnt == 0) {
129 mincnt = maxcnt;
130 }
131
132 while (nread < mincnt) {
133 readret = sys_read(fd, buf + nread, maxcnt - nread);
134
135 if (readret == 0) {
136 DEBUG(5,("read_fd_with_timeout: "
137 "blocking read. EOF from client.\n"));
138 return NT_STATUS_END_OF_FILE;
139 }
140
141 if (readret == -1) {
142 return map_nt_error_from_unix(errno);
143 }
144 nread += readret;
145 }
146 goto done;
147 }
148
149 /* Most difficult - timeout read */
150 /* If this is ever called on a disk file and
151 mincnt is greater then the filesize then
152 system performance will suffer severely as
153 select always returns true on disk files */
154
155 for (nread=0; nread < mincnt; ) {
156 int revents;
157
158 pollrtn = poll_intr_one_fd(fd, POLLIN|POLLHUP, time_out,
159 &revents);
160
161 /* Check if error */
162 if (pollrtn == -1) {
163 return map_nt_error_from_unix(errno);
164 }
165
166 /* Did we timeout ? */
167 if ((pollrtn == 0) ||
168 ((revents & (POLLIN|POLLHUP|POLLERR)) == 0)) {
169 DEBUG(10,("read_fd_with_timeout: timeout read. "
170 "select timed out.\n"));
171 return NT_STATUS_IO_TIMEOUT;
172 }
173
174 readret = sys_read(fd, buf+nread, maxcnt-nread);
175
176 if (readret == 0) {
177 /* we got EOF on the file descriptor */
178 DEBUG(5,("read_fd_with_timeout: timeout read. "
179 "EOF from client.\n"));
180 return NT_STATUS_END_OF_FILE;
181 }
182
183 if (readret == -1) {
184 return map_nt_error_from_unix(errno);
185 }
186
187 nread += readret;
188 }
189
190 done:
191 /* Return the number we got */
192 if (size_ret) {
193 *size_ret = nread;
194 }
195 return NT_STATUS_OK;
196 }
197
198 /****************************************************************************
199 Read data from an fd, reading exactly N bytes.
200 NB. This can be called with a non-socket fd, don't add dependencies
201 on socket calls.
202 ****************************************************************************/
203
204 NTSTATUS read_data(int fd, char *buffer, size_t N)
205 {
206 return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
207 }
208
209 /****************************************************************************
210 Write all data from an iov array
211 NB. This can be called with a non-socket fd, don't add dependencies
212 on socket calls.
213 ****************************************************************************/
214
215 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
216 {
217 int i;
218 size_t to_send;
219 ssize_t thistime;
220 size_t sent;
221 struct iovec *iov_copy, *iov;
222
223 to_send = 0;
224 for (i=0; i<iovcnt; i++) {
225 to_send += orig_iov[i].iov_len;
226 }
227
228 thistime = sys_writev(fd, orig_iov, iovcnt);
229 if ((thistime <= 0) || (thistime == to_send)) {
230 return thistime;
231 }
232 sent = thistime;
233
234 /*
235 * We could not send everything in one call. Make a copy of iov that
236 * we can mess with. We keep a copy of the array start in iov_copy for
237 * the TALLOC_FREE, because we're going to modify iov later on,
238 * discarding elements.
239 */
240
241 iov_copy = (struct iovec *)talloc_memdup(
242 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
243
244 if (iov_copy == NULL) {
245 errno = ENOMEM;
246 return -1;
247 }
248 iov = iov_copy;
249
250 while (sent < to_send) {
251 /*
252 * We have to discard "thistime" bytes from the beginning
253 * iov array, "thistime" contains the number of bytes sent
254 * via writev last.
255 */
256 while (thistime > 0) {
257 if (thistime < iov[0].iov_len) {
258 char *new_base =
259 (char *)iov[0].iov_base + thistime;
260 iov[0].iov_base = (void *)new_base;
261 iov[0].iov_len -= thistime;
262 break;
263 }
264 thistime -= iov[0].iov_len;
265 iov += 1;
266 iovcnt -= 1;
267 }
268
269 thistime = sys_writev(fd, iov, iovcnt);
270 if (thistime <= 0) {
271 break;
272 }
273 sent += thistime;
274 }
275
276 TALLOC_FREE(iov_copy);
277 return sent;
278 }
279
280 /****************************************************************************
281 Write data to a fd.
282 NB. This can be called with a non-socket fd, don't add dependencies
283 on socket calls.
284 ****************************************************************************/
285
286 ssize_t write_data(int fd, const char *buffer, size_t N)
287 {
288 struct iovec iov;
289
290 iov.iov_base = discard_const_p(void, buffer);
291 iov.iov_len = N;
292 return write_data_iov(fd, &iov, 1);
293 }
294
295 /****************************************************************************
296 Send a keepalive packet (rfc1002).
297 ****************************************************************************/
298
299 bool send_keepalive(int client)
300 {
301 unsigned char buf[4];
302
303 buf[0] = NBSSkeepalive;
304 buf[1] = buf[2] = buf[3] = 0;
305
306 return(write_data(client,(char *)buf,4) == 4);
307 }
308
309 /****************************************************************************
310 Read 4 bytes of a smb packet and return the smb length of the packet.
311 Store the result in the buffer.
312 This version of the function will return a length of zero on receiving
313 a keepalive packet.
314 Timeout is in milliseconds.
315 ****************************************************************************/
316
317 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
318 unsigned int timeout,
319 size_t *len)
320 {
321 int msg_type;
322 NTSTATUS status;
323
324 status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
325
326 if (!NT_STATUS_IS_OK(status)) {
327 return status;
328 }
329
330 *len = smb_len(inbuf);
331 msg_type = CVAL(inbuf,0);
332
333 if (msg_type == NBSSkeepalive) {
334 DEBUG(5,("Got keepalive packet\n"));
335 }
336
337 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
338
339 return NT_STATUS_OK;
340 }
341
342 /****************************************************************************
343 Read an smb from a fd.
344 The timeout is in milliseconds.
345 This function will return on receipt of a session keepalive packet.
346 maxlen is the max number of bytes to return, not including the 4 byte
347 length. If zero it means buflen limit.
348 Doesn't check the MAC on signed packets.
349 ****************************************************************************/
350
351 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
352 size_t maxlen, size_t *p_len)
353 {
354 size_t len;
355 NTSTATUS status;
356
357 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
358
359 if (!NT_STATUS_IS_OK(status)) {
360 DEBUG(0, ("read_fd_with_timeout failed, read "
361 "error = %s.\n", nt_errstr(status)));
362 return status;
363 }
364
365 if (len > buflen) {
366 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
367 (unsigned long)len));
368 return NT_STATUS_INVALID_PARAMETER;
369 }
370
371 if(len > 0) {
372 if (maxlen) {
373 len = MIN(len,maxlen);
374 }
375
376 status = read_fd_with_timeout(
377 fd, buffer+4, len, len, timeout, &len);
378
379 if (!NT_STATUS_IS_OK(status)) {
380 DEBUG(0, ("read_fd_with_timeout failed, read error = "
381 "%s.\n", nt_errstr(status)));
382 return status;
383 }
384
385 /* not all of samba3 properly checks for packet-termination
386 * of strings. This ensures that we don't run off into
387 * empty space. */
388 SSVAL(buffer+4,len, 0);
389 }
390
391 *p_len = len;
392 return NT_STATUS_OK;
393 }
394
395 /****************************************************************************
396 Open a socket of the specified type, port, and address for incoming data.
397 ****************************************************************************/
398
399 int open_socket_in(int type,
400 uint16_t port,
401 int dlevel,
402 const struct sockaddr_storage *psock,
403 bool rebind)
404 {
405 struct sockaddr_storage sock;
406 int res;
407 socklen_t slen = sizeof(struct sockaddr_in);
408
409 sock = *psock;
410
411 #if defined(HAVE_IPV6)
412 if (sock.ss_family == AF_INET6) {
413 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
414 slen = sizeof(struct sockaddr_in6);
415 }
416 #endif
417 if (sock.ss_family == AF_INET) {
418 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
419 }
420
421 res = socket(sock.ss_family, type, 0 );
422 if( res == -1 ) {
423 if( DEBUGLVL(0) ) {
424 dbgtext( "open_socket_in(): socket() call failed: " );
425 dbgtext( "%s\n", strerror( errno ) );
426 }
427 return -1;
428 }
429
430 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
431 {
432 int val = rebind ? 1 : 0;
433 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
434 (char *)&val,sizeof(val)) == -1 ) {
435 if( DEBUGLVL( dlevel ) ) {
436 dbgtext( "open_socket_in(): setsockopt: " );
437 dbgtext( "SO_REUSEADDR = %s ",
438 val?"true":"false" );
439 dbgtext( "on port %d failed ", port );
440 dbgtext( "with error = %s\n", strerror(errno) );
441 }
442 }
443 #ifdef SO_REUSEPORT
444 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
445 (char *)&val,sizeof(val)) == -1 ) {
446 if( DEBUGLVL( dlevel ) ) {
447 dbgtext( "open_socket_in(): setsockopt: ");
448 dbgtext( "SO_REUSEPORT = %s ",
449 val?"true":"false");
450 dbgtext( "on port %d failed ", port);
451 dbgtext( "with error = %s\n", strerror(errno));
452 }
453 }
454 #endif /* SO_REUSEPORT */
455 }
456
457 #ifdef HAVE_IPV6
458 /*
459 * As IPV6_V6ONLY is the default on some systems,
460 * we better try to be consistent and always use it.
461 *
462 * This also avoids using IPv4 via AF_INET6 sockets
463 * and makes sure %I never resolves to a '::ffff:192.168.0.1'
464 * string.
465 */
466 if (sock.ss_family == AF_INET6) {
467 int val = 1;
468 int ret;
469
470 ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY,
471 (const void *)&val, sizeof(val));
472 if (ret == -1) {
473 if(DEBUGLVL(0)) {
474 dbgtext("open_socket_in(): IPV6_ONLY failed: ");
475 dbgtext("%s\n", strerror(errno));
476 }
477 close(res);
478 return -1;
479 }
480 }
481 #endif
482
483 /* now we've got a socket - we need to bind it */
484 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
485 if( DEBUGLVL(dlevel) && (port == NMB_PORT ||
486 port == NBT_SMB_PORT ||
487 port == TCP_SMB_PORT) ) {
488 char addr[INET6_ADDRSTRLEN];
489 print_sockaddr(addr, sizeof(addr),
490 &sock);
491 dbgtext( "bind failed on port %d ", port);
492 dbgtext( "socket_addr = %s.\n", addr);
493 dbgtext( "Error = %s\n", strerror(errno));
494 }
495 close(res);
496 return -1;
497 }
498
499 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
500 return( res );
501 }
502
503 struct open_socket_out_state {
504 int fd;
505 struct event_context *ev;
506 struct sockaddr_storage ss;
507 socklen_t salen;
508 uint16_t port;
509 int wait_usec;
510 };
511
512 static void open_socket_out_connected(struct tevent_req *subreq);
513
514 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
515 {
516 if (s->fd != -1) {
517 close(s->fd);
518 }
519 return 0;
520 }
521
522 /****************************************************************************
523 Create an outgoing socket. timeout is in milliseconds.
524 **************************************************************************/
525
526 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
527 struct event_context *ev,
528 const struct sockaddr_storage *pss,
529 uint16_t port,
530 int timeout)
531 {
532 char addr[INET6_ADDRSTRLEN];
533 struct tevent_req *result, *subreq;
534 struct open_socket_out_state *state;
535 NTSTATUS status;
536
537 result = tevent_req_create(mem_ctx, &state,
538 struct open_socket_out_state);
539 if (result == NULL) {
540 return NULL;
541 }
542 state->ev = ev;
543 state->ss = *pss;
544 state->port = port;
545 state->wait_usec = 10000;
546 state->salen = -1;
547
548 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
549 if (state->fd == -1) {
550 status = map_nt_error_from_unix(errno);
551 goto post_status;
552 }
553 talloc_set_destructor(state, open_socket_out_state_destructor);
554
555 if (!tevent_req_set_endtime(
556 result, ev, timeval_current_ofs_msec(timeout))) {
557 goto fail;
558 }
559
560 #if defined(HAVE_IPV6)
561 if (pss->ss_family == AF_INET6) {
562 struct sockaddr_in6 *psa6;
563 psa6 = (struct sockaddr_in6 *)&state->ss;
564 psa6->sin6_port = htons(port);
565 if (psa6->sin6_scope_id == 0
566 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
567 setup_linklocal_scope_id(
568 (struct sockaddr *)&(state->ss));
569 }
570 state->salen = sizeof(struct sockaddr_in6);
571 }
572 #endif
573 if (pss->ss_family == AF_INET) {
574 struct sockaddr_in *psa;
575 psa = (struct sockaddr_in *)&state->ss;
576 psa->sin_port = htons(port);
577 state->salen = sizeof(struct sockaddr_in);
578 }
579
580 if (pss->ss_family == AF_UNIX) {
581 state->salen = sizeof(struct sockaddr_un);
582 }
583
584 print_sockaddr(addr, sizeof(addr), &state->ss);
585 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
586
587 subreq = async_connect_send(state, state->ev, state->fd,
588 (struct sockaddr *)&state->ss,
589 state->salen);
590 if ((subreq == NULL)
591 || !tevent_req_set_endtime(
592 subreq, state->ev,
593 timeval_current_ofs(0, state->wait_usec))) {
594 goto fail;
595 }
596 tevent_req_set_callback(subreq, open_socket_out_connected, result);
597 return result;
598
599 post_status:
600 tevent_req_nterror(result, status);
601 return tevent_req_post(result, ev);
602 fail:
603 TALLOC_FREE(result);
604 return NULL;
605 }
606
607 static void open_socket_out_connected(struct tevent_req *subreq)
608 {
609 struct tevent_req *req =
610 tevent_req_callback_data(subreq, struct tevent_req);
611 struct open_socket_out_state *state =
612 tevent_req_data(req, struct open_socket_out_state);
613 int ret;
614 int sys_errno;
615
616 ret = async_connect_recv(subreq, &sys_errno);
617 TALLOC_FREE(subreq);
618 if (ret == 0) {
619 tevent_req_done(req);
620 return;
621 }
622
623 if (
624 #ifdef ETIMEDOUT
625 (sys_errno == ETIMEDOUT) ||
626 #endif
627 (sys_errno == EINPROGRESS) ||
628 (sys_errno == EALREADY) ||
629 (sys_errno == EAGAIN)) {
630
631 /*
632 * retry
633 */
634
635 if (state->wait_usec < 250000) {
636 state->wait_usec *= 1.5;
637 }
638
639 subreq = async_connect_send(state, state->ev, state->fd,
640 (struct sockaddr *)&state->ss,
641 state->salen);
642 if (tevent_req_nomem(subreq, req)) {
643 return;
644 }
645 if (!tevent_req_set_endtime(
646 subreq, state->ev,
647 timeval_current_ofs_usec(state->wait_usec))) {
648 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
649 return;
650 }
651 tevent_req_set_callback(subreq, open_socket_out_connected, req);
652 return;
653 }
654
655 #ifdef EISCONN
656 if (sys_errno == EISCONN) {
657 tevent_req_done(req);
658 return;
659 }
660 #endif
661
662 /* real error */
663 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
664 }
665
666 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
667 {
668 struct open_socket_out_state *state =
669 tevent_req_data(req, struct open_socket_out_state);
670 NTSTATUS status;
671
672 if (tevent_req_is_nterror(req, &status)) {
673 return status;
674 }
675 *pfd = state->fd;
676 state->fd = -1;
677 return NT_STATUS_OK;
678 }
679
680 /**
681 * @brief open a socket
682 *
683 * @param pss a struct sockaddr_storage defining the address to connect to
684 * @param port to connect to
685 * @param timeout in MILLISECONDS
686 * @param pfd file descriptor returned
687 *
688 * @return NTSTATUS code
689 */
690 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
691 int timeout, int *pfd)
692 {
693 TALLOC_CTX *frame = talloc_stackframe();
694 struct event_context *ev;
695 struct tevent_req *req;
696 NTSTATUS status = NT_STATUS_NO_MEMORY;
697
698 ev = event_context_init(frame);
699 if (ev == NULL) {
700 goto fail;
701 }
702
703 req = open_socket_out_send(frame, ev, pss, port, timeout);
704 if (req == NULL) {
705 goto fail;
706 }
707 if (!tevent_req_poll(req, ev)) {
708 status = NT_STATUS_INTERNAL_ERROR;
709 goto fail;
710 }
711 status = open_socket_out_recv(req, pfd);
712 fail:
713 TALLOC_FREE(frame);
714 return status;
715 }
716
717 struct open_socket_out_defer_state {
718 struct event_context *ev;
719 struct sockaddr_storage ss;
720 uint16_t port;
721 int timeout;
722 int fd;
723 };
724
725 static void open_socket_out_defer_waited(struct tevent_req *subreq);
726 static void open_socket_out_defer_connected(struct tevent_req *subreq);
727
728 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
729 struct event_context *ev,
730 struct timeval wait_time,
731 const struct sockaddr_storage *pss,
732 uint16_t port,
733 int timeout)
734 {
735 struct tevent_req *req, *subreq;
736 struct open_socket_out_defer_state *state;
737
738 req = tevent_req_create(mem_ctx, &state,
739 struct open_socket_out_defer_state);
740 if (req == NULL) {
741 return NULL;
742 }
743 state->ev = ev;
744 state->ss = *pss;
745 state->port = port;
746 state->timeout = timeout;
747
748 subreq = tevent_wakeup_send(
749 state, ev,
750 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
751 if (subreq == NULL) {
752 goto fail;
753 }
754 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
755 return req;
756 fail:
757 TALLOC_FREE(req);
758 return NULL;
759 }
760
761 static void open_socket_out_defer_waited(struct tevent_req *subreq)
762 {
763 struct tevent_req *req = tevent_req_callback_data(
764 subreq, struct tevent_req);
765 struct open_socket_out_defer_state *state = tevent_req_data(
766 req, struct open_socket_out_defer_state);
767 bool ret;
768
769 ret = tevent_wakeup_recv(subreq);
770 TALLOC_FREE(subreq);
771 if (!ret) {
772 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
773 return;
774 }
775
776 subreq = open_socket_out_send(state, state->ev, &state->ss,
777 state->port, state->timeout);
778 if (tevent_req_nomem(subreq, req)) {
779 return;
780 }
781 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
782 }
783
784 static void open_socket_out_defer_connected(struct tevent_req *subreq)
785 {
786 struct tevent_req *req = tevent_req_callback_data(
787 subreq, struct tevent_req);
788 struct open_socket_out_defer_state *state = tevent_req_data(
789 req, struct open_socket_out_defer_state);
790 NTSTATUS status;
791
792 status = open_socket_out_recv(subreq, &state->fd);
793 TALLOC_FREE(subreq);
794 if (!NT_STATUS_IS_OK(status)) {
795 tevent_req_nterror(req, status);
796 return;
797 }
798 tevent_req_done(req);
799 }
800
801 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
802 {
803 struct open_socket_out_defer_state *state = tevent_req_data(
804 req, struct open_socket_out_defer_state);
805 NTSTATUS status;
806
807 if (tevent_req_is_nterror(req, &status)) {
808 return status;
809 }
810 *pfd = state->fd;
811 state->fd = -1;
812 return NT_STATUS_OK;
813 }
814
815 /****************************************************************************
816 Open a connected UDP socket to host on port
817 **************************************************************************/
818
819 int open_udp_socket(const char *host, int port)
820 {
821 struct sockaddr_storage ss;
822 int res;
823 socklen_t salen;
824
825 if (!interpret_string_addr(&ss, host, 0)) {
826 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
827 host));
828 return -1;
829 }
830
831 res = socket(ss.ss_family, SOCK_DGRAM, 0);
832 if (res == -1) {
833 return -1;
834 }
835
836 #if defined(HAVE_IPV6)
837 if (ss.ss_family == AF_INET6) {
838 struct sockaddr_in6 *psa6;
839 psa6 = (struct sockaddr_in6 *)&ss;
840 psa6->sin6_port = htons(port);
841 if (psa6->sin6_scope_id == 0
842 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
843 setup_linklocal_scope_id(
844 (struct sockaddr *)&ss);
845 }
846 salen = sizeof(struct sockaddr_in6);
847 } else
848 #endif
849 if (ss.ss_family == AF_INET) {
850 struct sockaddr_in *psa;
851 psa = (struct sockaddr_in *)&ss;
852 psa->sin_port = htons(port);
853 salen = sizeof(struct sockaddr_in);
854 } else {
855 DEBUG(1, ("unknown socket family %d", ss.ss_family));
856 return -1;
857 }
858
859 if (connect(res, (struct sockaddr *)&ss, salen)) {
860 close(res);
861 return -1;
862 }
863
864 return res;
865 }
866
867 /*******************************************************************
868 Return the IP addr of the remote end of a socket as a string.
869 Optionally return the struct sockaddr_storage.
870 ******************************************************************/
871
872 static const char *get_peer_addr_internal(int fd,
873 char *addr_buf,
874 size_t addr_buf_len,
875 struct sockaddr *pss,
876 socklen_t *plength)
877 {
878 struct sockaddr_storage ss;
879 socklen_t length = sizeof(ss);
880
881 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
882
883 if (fd == -1) {
884 return addr_buf;
885 }
886
887 if (pss == NULL) {
888 pss = (struct sockaddr *)&ss;
889 plength = &length;
890 }
891
892 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
893 int level = (errno == ENOTCONN) ? 2 : 0;
894 DEBUG(level, ("getpeername failed. Error was %s\n",
895 strerror(errno)));
896 return addr_buf;
897 }
898
899 print_sockaddr_len(addr_buf,
900 addr_buf_len,
901 pss,
902 *plength);
903 return addr_buf;
904 }
905
906 /*******************************************************************
907 Matchname - determine if host name matches IP address. Used to
908 confirm a hostname lookup to prevent spoof attacks.
909 ******************************************************************/
910
911 static bool matchname(const char *remotehost,
912 const struct sockaddr *pss,
913 socklen_t len)
914 {
915 struct addrinfo *res = NULL;
916 struct addrinfo *ailist = NULL;
917 char addr_buf[INET6_ADDRSTRLEN];
918 bool ret = interpret_string_addr_internal(&ailist,
919 remotehost,
920 AI_ADDRCONFIG|AI_CANONNAME);
921
922 if (!ret || ailist == NULL) {
923 DEBUG(3,("matchname: getaddrinfo failed for "
924 "name %s [%s]\n",
925 remotehost,
926 gai_strerror(ret) ));
927 return false;
928 }
929
930 /*
931 * Make sure that getaddrinfo() returns the "correct" host name.
932 */
933
934 if (ailist->ai_canonname == NULL ||
935 (!strequal(remotehost, ailist->ai_canonname) &&
936 !strequal(remotehost, "localhost"))) {
937 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
938 remotehost,
939 ailist->ai_canonname ?
940 ailist->ai_canonname : "(NULL)"));
941 freeaddrinfo(ailist);
942 return false;
943 }
944
945 /* Look up the host address in the address list we just got. */
946 for (res = ailist; res; res = res->ai_next) {
947 if (!res->ai_addr) {
948 continue;
949 }
950 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
951 (const struct sockaddr *)pss)) {
952 freeaddrinfo(ailist);
953 return true;
954 }
955 }
956
957 /*
958 * The host name does not map to the original host address. Perhaps
959 * someone has compromised a name server. More likely someone botched
960 * it, but that could be dangerous, too.
961 */
962
963 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
964 print_sockaddr_len(addr_buf,
965 sizeof(addr_buf),
966 pss,
967 len),
968 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
969
970 if (ailist) {
971 freeaddrinfo(ailist);
972 }
973 return false;
974 }
975
976 /*******************************************************************
977 Deal with the singleton cache.
978 ******************************************************************/
979
980 struct name_addr_pair {
981 struct sockaddr_storage ss;
982 const char *name;
983 };
984
985 /*******************************************************************
986 Lookup a name/addr pair. Returns memory allocated from memcache.
987 ******************************************************************/
988
989 static bool lookup_nc(struct name_addr_pair *nc)
990 {
991 DATA_BLOB tmp;
992
993 ZERO_STRUCTP(nc);
994
995 if (!memcache_lookup(
996 NULL, SINGLETON_CACHE,
997 data_blob_string_const_null("get_peer_name"),
998 &tmp)) {
999 return false;
1000 }
1001
1002 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1003 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1004 return true;
1005 }
1006
1007 /*******************************************************************
1008 Save a name/addr pair.
1009 ******************************************************************/
1010
1011 static void store_nc(const struct name_addr_pair *nc)
1012 {
1013 DATA_BLOB tmp;
1014 size_t namelen = strlen(nc->name);
1015
1016 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1017 if (!tmp.data) {
1018 return;
1019 }
1020 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1021 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1022
1023 memcache_add(NULL, SINGLETON_CACHE,
1024 data_blob_string_const_null("get_peer_name"),
1025 tmp);
1026 data_blob_free(&tmp);
1027 }
1028
1029 /*******************************************************************
1030 Return the DNS name of the remote end of a socket.
1031 ******************************************************************/
1032
1033 const char *get_peer_name(int fd, bool force_lookup)
1034 {
1035 struct name_addr_pair nc;
1036 char addr_buf[INET6_ADDRSTRLEN];
1037 struct sockaddr_storage ss;
1038 socklen_t length = sizeof(ss);
1039 const char *p;
1040 int ret;
1041 char name_buf[MAX_DNS_NAME_LENGTH];
1042 char tmp_name[MAX_DNS_NAME_LENGTH];
1043
1044 /* reverse lookups can be *very* expensive, and in many
1045 situations won't work because many networks don't link dhcp
1046 with dns. To avoid the delay we avoid the lookup if
1047 possible */
1048 if (!lp_hostname_lookups() && (force_lookup == false)) {
1049 length = sizeof(nc.ss);
1050 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1051 (struct sockaddr *)&nc.ss, &length);
1052 store_nc(&nc);
1053 lookup_nc(&nc);
1054 return nc.name ? nc.name : "UNKNOWN";
1055 }
1056
1057 lookup_nc(&nc);
1058
1059 memset(&ss, '\0', sizeof(ss));
1060 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1061
1062 /* it might be the same as the last one - save some DNS work */
1063 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1064 return nc.name ? nc.name : "UNKNOWN";
1065 }
1066
1067 /* Not the same. We need to lookup. */
1068 if (fd == -1) {
1069 return "UNKNOWN";
1070 }
1071
1072 /* Look up the remote host name. */
1073 ret = sys_getnameinfo((struct sockaddr *)&ss,
1074 length,
1075 name_buf,
1076 sizeof(name_buf),
1077 NULL,
1078 0,
1079 0);
1080
1081 if (ret) {
1082 DEBUG(1,("get_peer_name: getnameinfo failed "
1083 "for %s with error %s\n",
1084 p,
1085 gai_strerror(ret)));
1086 strlcpy(name_buf, p, sizeof(name_buf));
1087 } else {
1088 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1089 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1090 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1091 }
1092 }
1093
1094 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1095 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1096 if (strstr(name_buf,"..")) {
1097 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1098 }
1099
1100 nc.name = name_buf;
1101 nc.ss = ss;
1102
1103 store_nc(&nc);
1104 lookup_nc(&nc);
1105 return nc.name ? nc.name : "UNKNOWN";
1106 }
1107
1108 /*******************************************************************
1109 Return the IP addr of the remote end of a socket as a string.
1110 ******************************************************************/
1111
1112 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1113 {
1114 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1115 }
1116
1117 int get_remote_hostname(const struct tsocket_address *remote_address,
1118 char **name,
1119 TALLOC_CTX *mem_ctx)
1120 {
1121 char name_buf[MAX_DNS_NAME_LENGTH];
1122 char tmp_name[MAX_DNS_NAME_LENGTH];
1123 struct name_addr_pair nc;
1124 struct sockaddr_storage ss;
1125 ssize_t len;
1126 int rc;
1127
1128 if (!lp_hostname_lookups()) {
1129 nc.name = tsocket_address_inet_addr_string(remote_address,
1130 mem_ctx);
1131 if (nc.name == NULL) {
1132 return -1;
1133 }
1134
1135 len = tsocket_address_bsd_sockaddr(remote_address,
1136 (struct sockaddr *) &nc.ss,
1137 sizeof(struct sockaddr_storage));
1138 if (len < 0) {
1139 return -1;
1140 }
1141
1142 store_nc(&nc);
1143 lookup_nc(&nc);
1144
1145 if (nc.name == NULL) {
1146 *name = talloc_strdup(mem_ctx, "UNKNOWN");
1147 } else {
1148 *name = talloc_strdup(mem_ctx, nc.name);
1149 }
1150 return 0;
1151 }
1152
1153 lookup_nc(&nc);
1154
1155 ZERO_STRUCT(ss);
1156
1157 len = tsocket_address_bsd_sockaddr(remote_address,
1158 (struct sockaddr *) &ss,
1159 sizeof(struct sockaddr_storage));
1160 if (len < 0) {
1161 return -1;
1162 }
1163
1164 /* it might be the same as the last one - save some DNS work */
1165 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1166 if (nc.name == NULL) {
1167 *name = talloc_strdup(mem_ctx, "UNKNOWN");
1168 } else {
1169 *name = talloc_strdup(mem_ctx, nc.name);
1170 }
1171 return 0;
1172 }
1173
1174 /* Look up the remote host name. */
1175 rc = sys_getnameinfo((struct sockaddr *) &ss,
1176 len,
1177 name_buf,
1178 sizeof(name_buf),
1179 NULL,
1180 0,
1181 0);
1182 if (rc < 0) {
1183 char *p;
1184
1185 p = tsocket_address_inet_addr_string(remote_address, mem_ctx);
1186 if (p == NULL) {
1187 return -1;
1188 }
1189
1190 DEBUG(1,("getnameinfo failed for %s with error %s\n",
1191 p,
1192 gai_strerror(rc)));
1193 strlcpy(name_buf, p, sizeof(name_buf));
1194
1195 TALLOC_FREE(p);
1196 } else {
1197 if (!matchname(name_buf, (struct sockaddr *)&ss, len)) {
1198 DEBUG(0,("matchname failed on %s\n", name_buf));
1199 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1200 }
1201 }
1202
1203 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1204 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1205 if (strstr(name_buf,"..")) {
1206 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1207 }
1208
1209 nc.name = name_buf;
1210 nc.ss = ss;
1211
1212 store_nc(&nc);
1213 lookup_nc(&nc);
1214
1215 if (nc.name == NULL) {
1216 *name = talloc_strdup(mem_ctx, "UNKOWN");
1217 } else {
1218 *name = talloc_strdup(mem_ctx, nc.name);
1219 }
1220
1221 return 0;
1222 }
1223
1224 /*******************************************************************
1225 Create protected unix domain socket.
1226
1227 Some unixes cannot set permissions on a ux-dom-sock, so we
1228 have to make sure that the directory contains the protection
1229 permissions instead.
1230 ******************************************************************/
1231
1232 int create_pipe_sock(const char *socket_dir,
1233 const char *socket_name,
1234 mode_t dir_perms)
1235 {
1236 #ifdef HAVE_UNIXSOCKET
1237 struct sockaddr_un sunaddr;
1238 struct stat st;
1239 int sock;
1240 mode_t old_umask;
1241 char *path = NULL;
1242
1243 old_umask = umask(0);
1244
1245 /* Create the socket directory or reuse the existing one */
1246
1247 if (lstat(socket_dir, &st) == -1) {
1248 if (errno == ENOENT) {
1249 /* Create directory */
1250 if (mkdir(socket_dir, dir_perms) == -1) {
1251 DEBUG(0, ("error creating socket directory "
1252 "%s: %s\n", socket_dir,
1253 strerror(errno)));
1254 goto out_umask;
1255 }
1256 } else {
1257 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1258 socket_dir, strerror(errno)));
1259 goto out_umask;
1260 }
1261 } else {
1262 /* Check ownership and permission on existing directory */
1263 if (!S_ISDIR(st.st_mode)) {
1264 DEBUG(0, ("socket directory '%s' isn't a directory\n",
1265 socket_dir));
1266 goto out_umask;
1267 }
1268 if (st.st_uid != sec_initial_uid()) {
1269 DEBUG(0, ("invalid ownership on directory "
1270 "'%s'\n", socket_dir));
1271 umask(old_umask);
1272 goto out_umask;
1273 }
1274 if ((st.st_mode & 0777) != dir_perms) {
1275 DEBUG(0, ("invalid permissions on directory "
1276 "'%s': has 0%o should be 0%o\n", socket_dir,
1277 (st.st_mode & 0777), dir_perms));
1278 umask(old_umask);
1279 goto out_umask;
1280 }
1281 }
1282
1283 /* Create the socket file */
1284
1285 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1286
1287 if (sock == -1) {
1288 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1289 strerror(errno) ));
1290 goto out_close;
1291 }
1292
1293 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1294 goto out_close;
1295 }
1296
1297 unlink(path);
1298 memset(&sunaddr, 0, sizeof(sunaddr));
1299 sunaddr.sun_family = AF_UNIX;
1300 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1301
1302 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1303 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1304 strerror(errno)));
1305 goto out_close;
1306 }
1307
1308 SAFE_FREE(path);
1309
1310 umask(old_umask);
1311 return sock;
1312
1313 out_close:
1314 SAFE_FREE(path);
1315 if (sock != -1)
1316 close(sock);
1317
1318 out_umask:
1319 umask(old_umask);
1320 return -1;
1321
1322 #else
1323 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1324 return -1;
1325 #endif /* HAVE_UNIXSOCKET */
1326 }
1327
1328 /****************************************************************************
1329 Get my own canonical name, including domain.
1330 ****************************************************************************/
1331
1332 const char *get_mydnsfullname(void)
1333 {
1334 struct addrinfo *res = NULL;
1335 char my_hostname[HOST_NAME_MAX];
1336 bool ret;
1337 DATA_BLOB tmp;
1338
1339 if (memcache_lookup(NULL, SINGLETON_CACHE,
1340 data_blob_string_const_null("get_mydnsfullname"),
1341 &tmp)) {
1342 SMB_ASSERT(tmp.length > 0);
1343 return (const char *)tmp.data;
1344 }
1345
1346 /* get my host name */
1347 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1348 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1349 return NULL;
1350 }
1351
1352 /* Ensure null termination. */
1353 my_hostname[sizeof(my_hostname)-1] = '\0';
1354
1355 ret = interpret_string_addr_internal(&res,
1356 my_hostname,
1357 AI_ADDRCONFIG|AI_CANONNAME);
1358
1359 if (!ret || res == NULL) {
1360 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1361 "name %s [%s]\n",
1362 my_hostname,
1363 gai_strerror(ret) ));
1364 return NULL;
1365 }
1366
1367 /*
1368 * Make sure that getaddrinfo() returns the "correct" host name.
1369 */
1370
1371 if (res->ai_canonname == NULL) {
1372 DEBUG(3,("get_mydnsfullname: failed to get "
1373 "canonical name for %s\n",
1374 my_hostname));
1375 freeaddrinfo(res);
1376 return NULL;
1377 }
1378
1379 /* This copies the data, so we must do a lookup
1380 * afterwards to find the value to return.
1381 */
1382
1383 memcache_add(NULL, SINGLETON_CACHE,
1384 data_blob_string_const_null("get_mydnsfullname"),
1385 data_blob_string_const_null(res->ai_canonname));
1386
1387 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1388 data_blob_string_const_null("get_mydnsfullname"),
1389 &tmp)) {
1390 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1391 strlen(res->ai_canonname) + 1);
1392 }
1393
1394 freeaddrinfo(res);
1395
1396 return (const char *)tmp.data;
1397 }
1398
1399 /************************************************************
1400 Is this my ip address ?
1401 ************************************************************/
1402
1403 static bool is_my_ipaddr(const char *ipaddr_str)
1404 {
1405 struct sockaddr_storage ss;
1406 struct iface_struct *nics;
1407 int i, n;
1408
1409 if (!interpret_string_addr(&ss, ipaddr_str, AI_NUMERICHOST)) {
1410 return false;
1411 }
1412
1413 if (is_zero_addr(&ss)) {
1414 return false;
1415 }
1416
1417 if (ismyaddr((struct sockaddr *)&ss) ||
1418 is_loopback_addr((struct sockaddr *)&ss)) {
1419 return true;
1420 }
1421
1422 n = get_interfaces(talloc_tos(), &nics);
1423 for (i=0; i<n; i++) {
1424 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1425 TALLOC_FREE(nics);
1426 return true;
1427 }
1428 }
1429 TALLOC_FREE(nics);
1430 return false;
1431 }
1432
1433 /************************************************************
1434 Is this my name ?
1435 ************************************************************/
1436
1437 bool is_myname_or_ipaddr(const char *s)
1438 {
1439 TALLOC_CTX *ctx = talloc_tos();
1440 char *name = NULL;
1441 const char *dnsname;
1442 char *servername = NULL;
1443
1444 if (!s) {
1445 return false;
1446 }
1447
1448 /* Santize the string from '\\name' */
1449 name = talloc_strdup(ctx, s);
1450 if (!name) {
1451 return false;
1452 }
1453
1454 servername = strrchr_m(name, '\\' );
1455 if (!servername) {
1456 servername = name;
1457 } else {
1458 servername++;
1459 }
1460
1461 /* Optimize for the common case */
1462 if (strequal(servername, lp_netbios_name())) {
1463 return true;
1464 }
1465
1466 /* Check for an alias */
1467 if (is_myname(servername)) {
1468 return true;
1469 }
1470
1471 /* Check for loopback */
1472 if (strequal(servername, "127.0.0.1") ||
1473 strequal(servername, "::1")) {
1474 return true;
1475 }
1476
1477 if (strequal(servername, "localhost")) {
1478 return true;
1479 }
1480
1481 /* Maybe it's my dns name */
1482 dnsname = get_mydnsfullname();
1483 if (dnsname && strequal(servername, dnsname)) {
1484 return true;
1485 }
1486
1487 /* Maybe its an IP address? */
1488 if (is_ipaddress(servername)) {
1489 return is_my_ipaddr(servername);
1490 }
1491
1492 /* Handle possible CNAME records - convert to an IP addr. list. */
1493 {
1494 /* Use DNS to resolve the name, check all addresses. */
1495 struct addrinfo *p = NULL;
1496 struct addrinfo *res = NULL;
1497
1498 if (!interpret_string_addr_internal(&res,
1499 servername,
1500 AI_ADDRCONFIG)) {
1501 return false;
1502 }
1503
1504 for (p = res; p; p = p->ai_next) {
1505 char addr[INET6_ADDRSTRLEN];
1506 struct sockaddr_storage ss;
1507
1508 ZERO_STRUCT(ss);
1509 memcpy(&ss, p->ai_addr, p->ai_addrlen);
1510 print_sockaddr(addr,
1511 sizeof(addr),
1512 &ss);
1513 if (is_my_ipaddr(addr)) {
1514 freeaddrinfo(res);
1515 return true;
1516 }
1517 }
1518 freeaddrinfo(res);
1519 }
1520
1521 /* No match */
1522 return false;
1523 }
1524
1525 struct getaddrinfo_state {
1526 const char *node;
1527 const char *service;
1528 const struct addrinfo *hints;
1529 struct addrinfo *res;
1530 int ret;
1531 };
1532
1533 static void getaddrinfo_do(void *private_data);
1534 static void getaddrinfo_done(struct tevent_req *subreq);
1535
1536 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1537 struct tevent_context *ev,
1538 struct fncall_context *ctx,
1539 const char *node,
1540 const char *service,
1541 const struct addrinfo *hints)
1542 {
1543 struct tevent_req *req, *subreq;
1544 struct getaddrinfo_state *state;
1545
1546 req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1547 if (req == NULL) {
1548 return NULL;
1549 }
1550
1551 state->node = node;
1552 state->service = service;
1553 state->hints = hints;
1554
1555 subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1556 if (tevent_req_nomem(subreq, req)) {
1557 return tevent_req_post(req, ev);
1558 }
1559 tevent_req_set_callback(subreq, getaddrinfo_done, req);
1560 return req;
1561 }
1562
1563 static void getaddrinfo_do(void *private_data)
1564 {
1565 struct getaddrinfo_state *state =
1566 (struct getaddrinfo_state *)private_data;
1567
1568 state->ret = getaddrinfo(state->node, state->service, state->hints,
1569 &state->res);
1570 }
1571
1572 static void getaddrinfo_done(struct tevent_req *subreq)
1573 {
1574 struct tevent_req *req = tevent_req_callback_data(
1575 subreq, struct tevent_req);
1576 int ret, err;
1577
1578 ret = fncall_recv(subreq, &err);
1579 TALLOC_FREE(subreq);
1580 if (ret == -1) {
1581 tevent_req_error(req, err);
1582 return;
1583 }
1584 tevent_req_done(req);
1585 }
1586
1587 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1588 {
1589 struct getaddrinfo_state *state = tevent_req_data(
1590 req, struct getaddrinfo_state);
1591 int err;
1592
1593 if (tevent_req_is_unix_error(req, &err)) {
1594 switch(err) {
1595 case ENOMEM:
1596 return EAI_MEMORY;
1597 default:
1598 return EAI_FAIL;
1599 }
1600 }
1601 if (state->ret == 0) {
1602 *res = state->res;
1603 }
1604 return state->ret;
1605 }
1606
1607 int poll_one_fd(int fd, int events, int timeout, int *revents)
1608 {
1609 struct pollfd *fds;
1610 int ret;
1611 int saved_errno;
1612
1613 fds = talloc_zero_array(talloc_tos(), struct pollfd, 1);
1614 if (fds == NULL) {
1615 errno = ENOMEM;
1616 return -1;
1617 }
1618 fds[0].fd = fd;
1619 fds[0].events = events;
1620
1621 ret = poll(fds, 1, timeout);
1622
1623 /*
1624 * Assign whatever poll did, even in the ret<=0 case.
1625 */
1626 *revents = fds[0].revents;
1627 saved_errno = errno;
1628 TALLOC_FREE(fds);
1629 errno = saved_errno;
1630
1631 return ret;
1632 }
1633
1634 int poll_intr_one_fd(int fd, int events, int timeout, int *revents)
1635 {
1636 struct pollfd pfd;
1637 int ret;
1638
1639 pfd.fd = fd;
1640 pfd.events = events;
1641
1642 ret = sys_poll_intr(&pfd, 1, timeout);
1643 if (ret <= 0) {
1644 *revents = 0;
1645 return ret;
1646 }
1647 *revents = pfd.revents;
1648 return 1;
1649 }
reg import