source: vendor/current/source3/lib/util_sock.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 34.6 KB
Line 
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 "../lib/util/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#include "lib/util/sys_rw.h"
32#include "lib/util/sys_rw_data.h"
33
34const char *client_addr(int fd, char *addr, size_t addrlen)
35{
36 return get_peer_addr(fd,addr,addrlen);
37}
38
39#if 0
40/* Not currently used. JRA. */
41int client_socket_port(int fd)
42{
43 return get_socket_port(fd);
44}
45#endif
46
47/****************************************************************************
48 Determine if a file descriptor is in fact a socket.
49****************************************************************************/
50
51bool is_a_socket(int fd)
52{
53 int v;
54 socklen_t l;
55 l = sizeof(int);
56 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
57}
58
59/****************************************************************************
60 Read from a socket.
61****************************************************************************/
62
63ssize_t read_udp_v4_socket(int fd,
64 char *buf,
65 size_t len,
66 struct sockaddr_storage *psa)
67{
68 ssize_t ret;
69 socklen_t socklen = sizeof(*psa);
70 struct sockaddr_in *si = (struct sockaddr_in *)psa;
71
72 memset((char *)psa,'\0',socklen);
73
74 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
75 (struct sockaddr *)psa,&socklen);
76 if (ret <= 0) {
77 /* Don't print a low debug error for a non-blocking socket. */
78 if (errno == EAGAIN) {
79 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
80 } else {
81 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
82 strerror(errno)));
83 }
84 return 0;
85 }
86
87 if (psa->ss_family != AF_INET) {
88 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
89 "(not IPv4)\n", (int)psa->ss_family));
90 return 0;
91 }
92
93 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
94 inet_ntoa(si->sin_addr),
95 si->sin_port,
96 (unsigned long)ret));
97
98 return ret;
99}
100
101/****************************************************************************
102 Read data from a file descriptor with a timout in msec.
103 mincount = if timeout, minimum to read before returning
104 maxcount = number to be read.
105 time_out = timeout in milliseconds
106 NB. This can be called with a non-socket fd, don't change
107 sys_read() to sys_recv() or other socket call.
108****************************************************************************/
109
110NTSTATUS read_fd_with_timeout(int fd, char *buf,
111 size_t mincnt, size_t maxcnt,
112 unsigned int time_out,
113 size_t *size_ret)
114{
115 int pollrtn;
116 ssize_t readret;
117 size_t nread = 0;
118
119 /* just checking .... */
120 if (maxcnt <= 0)
121 return NT_STATUS_OK;
122
123 /* Blocking read */
124 if (time_out == 0) {
125 if (mincnt == 0) {
126 mincnt = maxcnt;
127 }
128
129 while (nread < mincnt) {
130 readret = sys_read(fd, buf + nread, maxcnt - nread);
131
132 if (readret == 0) {
133 DEBUG(5,("read_fd_with_timeout: "
134 "blocking read. EOF from client.\n"));
135 return NT_STATUS_END_OF_FILE;
136 }
137
138 if (readret == -1) {
139 return map_nt_error_from_unix(errno);
140 }
141 nread += readret;
142 }
143 goto done;
144 }
145
146 /* Most difficult - timeout read */
147 /* If this is ever called on a disk file and
148 mincnt is greater then the filesize then
149 system performance will suffer severely as
150 select always returns true on disk files */
151
152 for (nread=0; nread < mincnt; ) {
153 int revents;
154
155 pollrtn = poll_intr_one_fd(fd, POLLIN|POLLHUP, time_out,
156 &revents);
157
158 /* Check if error */
159 if (pollrtn == -1) {
160 return map_nt_error_from_unix(errno);
161 }
162
163 /* Did we timeout ? */
164 if ((pollrtn == 0) ||
165 ((revents & (POLLIN|POLLHUP|POLLERR)) == 0)) {
166 DEBUG(10,("read_fd_with_timeout: timeout read. "
167 "select timed out.\n"));
168 return NT_STATUS_IO_TIMEOUT;
169 }
170
171 readret = sys_read(fd, buf+nread, maxcnt-nread);
172
173 if (readret == 0) {
174 /* we got EOF on the file descriptor */
175 DEBUG(5,("read_fd_with_timeout: timeout read. "
176 "EOF from client.\n"));
177 return NT_STATUS_END_OF_FILE;
178 }
179
180 if (readret == -1) {
181 return map_nt_error_from_unix(errno);
182 }
183
184 nread += readret;
185 }
186
187 done:
188 /* Return the number we got */
189 if (size_ret) {
190 *size_ret = nread;
191 }
192 return NT_STATUS_OK;
193}
194
195/****************************************************************************
196 Read data from an fd, reading exactly N bytes.
197 NB. This can be called with a non-socket fd, don't add dependencies
198 on socket calls.
199****************************************************************************/
200
201NTSTATUS read_data_ntstatus(int fd, char *buffer, size_t N)
202{
203 return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
204}
205
206/****************************************************************************
207 Send a keepalive packet (rfc1002).
208****************************************************************************/
209
210bool send_keepalive(int client)
211{
212 unsigned char buf[4];
213
214 buf[0] = NBSSkeepalive;
215 buf[1] = buf[2] = buf[3] = 0;
216
217 return(write_data(client,(char *)buf,4) == 4);
218}
219
220/****************************************************************************
221 Read 4 bytes of a smb packet and return the smb length of the packet.
222 Store the result in the buffer.
223 This version of the function will return a length of zero on receiving
224 a keepalive packet.
225 Timeout is in milliseconds.
226****************************************************************************/
227
228NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
229 unsigned int timeout,
230 size_t *len)
231{
232 int msg_type;
233 NTSTATUS status;
234
235 status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
236
237 if (!NT_STATUS_IS_OK(status)) {
238 return status;
239 }
240
241 *len = smb_len(inbuf);
242 msg_type = CVAL(inbuf,0);
243
244 if (msg_type == NBSSkeepalive) {
245 DEBUG(5,("Got keepalive packet\n"));
246 }
247
248 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
249
250 return NT_STATUS_OK;
251}
252
253/****************************************************************************
254 Read an smb from a fd.
255 The timeout is in milliseconds.
256 This function will return on receipt of a session keepalive packet.
257 maxlen is the max number of bytes to return, not including the 4 byte
258 length. If zero it means buflen limit.
259 Doesn't check the MAC on signed packets.
260****************************************************************************/
261
262NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
263 size_t maxlen, size_t *p_len)
264{
265 size_t len;
266 NTSTATUS status;
267
268 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
269
270 if (!NT_STATUS_IS_OK(status)) {
271 DEBUG(0, ("read_fd_with_timeout failed, read "
272 "error = %s.\n", nt_errstr(status)));
273 return status;
274 }
275
276 if (len > buflen) {
277 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
278 (unsigned long)len));
279 return NT_STATUS_INVALID_PARAMETER;
280 }
281
282 if(len > 0) {
283 if (maxlen) {
284 len = MIN(len,maxlen);
285 }
286
287 status = read_fd_with_timeout(
288 fd, buffer+4, len, len, timeout, &len);
289
290 if (!NT_STATUS_IS_OK(status)) {
291 DEBUG(0, ("read_fd_with_timeout failed, read error = "
292 "%s.\n", nt_errstr(status)));
293 return status;
294 }
295
296 /* not all of samba3 properly checks for packet-termination
297 * of strings. This ensures that we don't run off into
298 * empty space. */
299 SSVAL(buffer+4,len, 0);
300 }
301
302 *p_len = len;
303 return NT_STATUS_OK;
304}
305
306/****************************************************************************
307 Open a socket of the specified type, port, and address for incoming data.
308****************************************************************************/
309
310int open_socket_in(int type,
311 uint16_t port,
312 int dlevel,
313 const struct sockaddr_storage *psock,
314 bool rebind)
315{
316 struct sockaddr_storage sock;
317 int res;
318 socklen_t slen = sizeof(struct sockaddr_in);
319
320 sock = *psock;
321
322#if defined(HAVE_IPV6)
323 if (sock.ss_family == AF_INET6) {
324 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
325 slen = sizeof(struct sockaddr_in6);
326 }
327#endif
328 if (sock.ss_family == AF_INET) {
329 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
330 }
331
332 res = socket(sock.ss_family, type, 0 );
333 if( res == -1 ) {
334 if( DEBUGLVL(0) ) {
335 dbgtext( "open_socket_in(): socket() call failed: " );
336 dbgtext( "%s\n", strerror( errno ) );
337 }
338 return -1;
339 }
340
341 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
342 {
343 int val = rebind ? 1 : 0;
344 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
345 (char *)&val,sizeof(val)) == -1 ) {
346 if( DEBUGLVL( dlevel ) ) {
347 dbgtext( "open_socket_in(): setsockopt: " );
348 dbgtext( "SO_REUSEADDR = %s ",
349 val?"true":"false" );
350 dbgtext( "on port %d failed ", port );
351 dbgtext( "with error = %s\n", strerror(errno) );
352 }
353 }
354#ifdef SO_REUSEPORT
355 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
356 (char *)&val,sizeof(val)) == -1 ) {
357 if( DEBUGLVL( dlevel ) ) {
358 dbgtext( "open_socket_in(): setsockopt: ");
359 dbgtext( "SO_REUSEPORT = %s ",
360 val?"true":"false");
361 dbgtext( "on port %d failed ", port);
362 dbgtext( "with error = %s\n", strerror(errno));
363 }
364 }
365#endif /* SO_REUSEPORT */
366 }
367
368#ifdef HAVE_IPV6
369 /*
370 * As IPV6_V6ONLY is the default on some systems,
371 * we better try to be consistent and always use it.
372 *
373 * This also avoids using IPv4 via AF_INET6 sockets
374 * and makes sure %I never resolves to a '::ffff:192.168.0.1'
375 * string.
376 */
377 if (sock.ss_family == AF_INET6) {
378 int val = 1;
379 int ret;
380
381 ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY,
382 (const void *)&val, sizeof(val));
383 if (ret == -1) {
384 if(DEBUGLVL(0)) {
385 dbgtext("open_socket_in(): IPV6_ONLY failed: ");
386 dbgtext("%s\n", strerror(errno));
387 }
388 close(res);
389 return -1;
390 }
391 }
392#endif
393
394 /* now we've got a socket - we need to bind it */
395 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
396 if( DEBUGLVL(dlevel) && (port == NMB_PORT ||
397 port == NBT_SMB_PORT ||
398 port == TCP_SMB_PORT) ) {
399 char addr[INET6_ADDRSTRLEN];
400 print_sockaddr(addr, sizeof(addr),
401 &sock);
402 dbgtext( "bind failed on port %d ", port);
403 dbgtext( "socket_addr = %s.\n", addr);
404 dbgtext( "Error = %s\n", strerror(errno));
405 }
406 close(res);
407 return -1;
408 }
409
410 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
411 return( res );
412 }
413
414struct open_socket_out_state {
415 int fd;
416 struct tevent_context *ev;
417 struct sockaddr_storage ss;
418 socklen_t salen;
419 uint16_t port;
420 int wait_usec;
421 struct tevent_req *connect_subreq;
422};
423
424static void open_socket_out_connected(struct tevent_req *subreq);
425
426static void open_socket_out_cleanup(struct tevent_req *req,
427 enum tevent_req_state req_state)
428{
429 struct open_socket_out_state *state =
430 tevent_req_data(req, struct open_socket_out_state);
431
432 /*
433 * Make sure that the async_connect_send subreq has a chance to reset
434 * fcntl before the socket goes away.
435 */
436 TALLOC_FREE(state->connect_subreq);
437
438 if (req_state == TEVENT_REQ_DONE) {
439 /*
440 * we keep the socket open for the caller to use
441 */
442 return;
443 }
444
445 if (state->fd != -1) {
446 close(state->fd);
447 state->fd = -1;
448 }
449}
450
451/****************************************************************************
452 Create an outgoing socket. timeout is in milliseconds.
453**************************************************************************/
454
455struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
456 struct tevent_context *ev,
457 const struct sockaddr_storage *pss,
458 uint16_t port,
459 int timeout)
460{
461 char addr[INET6_ADDRSTRLEN];
462 struct tevent_req *result;
463 struct open_socket_out_state *state;
464 NTSTATUS status;
465
466 result = tevent_req_create(mem_ctx, &state,
467 struct open_socket_out_state);
468 if (result == NULL) {
469 return NULL;
470 }
471 state->ev = ev;
472 state->ss = *pss;
473 state->port = port;
474 state->wait_usec = 10000;
475 state->salen = -1;
476
477 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
478 if (state->fd == -1) {
479 status = map_nt_error_from_unix(errno);
480 goto post_status;
481 }
482
483 tevent_req_set_cleanup_fn(result, open_socket_out_cleanup);
484
485 if (!tevent_req_set_endtime(
486 result, ev, timeval_current_ofs_msec(timeout))) {
487 goto fail;
488 }
489
490#if defined(HAVE_IPV6)
491 if (pss->ss_family == AF_INET6) {
492 struct sockaddr_in6 *psa6;
493 psa6 = (struct sockaddr_in6 *)&state->ss;
494 psa6->sin6_port = htons(port);
495 if (psa6->sin6_scope_id == 0
496 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
497 setup_linklocal_scope_id(
498 (struct sockaddr *)&(state->ss));
499 }
500 state->salen = sizeof(struct sockaddr_in6);
501 }
502#endif
503 if (pss->ss_family == AF_INET) {
504 struct sockaddr_in *psa;
505 psa = (struct sockaddr_in *)&state->ss;
506 psa->sin_port = htons(port);
507 state->salen = sizeof(struct sockaddr_in);
508 }
509
510 if (pss->ss_family == AF_UNIX) {
511 state->salen = sizeof(struct sockaddr_un);
512 }
513
514 print_sockaddr(addr, sizeof(addr), &state->ss);
515 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
516
517 state->connect_subreq = async_connect_send(
518 state, state->ev, state->fd, (struct sockaddr *)&state->ss,
519 state->salen, NULL, NULL, NULL);
520 if ((state->connect_subreq == NULL)
521 || !tevent_req_set_endtime(
522 state->connect_subreq, state->ev,
523 timeval_current_ofs(0, state->wait_usec))) {
524 goto fail;
525 }
526 tevent_req_set_callback(state->connect_subreq,
527 open_socket_out_connected, result);
528 return result;
529
530 post_status:
531 tevent_req_nterror(result, status);
532 return tevent_req_post(result, ev);
533 fail:
534 TALLOC_FREE(result);
535 return NULL;
536}
537
538static void open_socket_out_connected(struct tevent_req *subreq)
539{
540 struct tevent_req *req =
541 tevent_req_callback_data(subreq, struct tevent_req);
542 struct open_socket_out_state *state =
543 tevent_req_data(req, struct open_socket_out_state);
544 int ret;
545 int sys_errno;
546
547 ret = async_connect_recv(subreq, &sys_errno);
548 TALLOC_FREE(subreq);
549 state->connect_subreq = NULL;
550 if (ret == 0) {
551 tevent_req_done(req);
552 return;
553 }
554
555 if (
556#ifdef ETIMEDOUT
557 (sys_errno == ETIMEDOUT) ||
558#endif
559 (sys_errno == EINPROGRESS) ||
560 (sys_errno == EALREADY) ||
561 (sys_errno == EAGAIN)) {
562
563 /*
564 * retry
565 */
566
567 if (state->wait_usec < 250000) {
568 state->wait_usec *= 1.5;
569 }
570
571 subreq = async_connect_send(state, state->ev, state->fd,
572 (struct sockaddr *)&state->ss,
573 state->salen, NULL, NULL, NULL);
574 if (tevent_req_nomem(subreq, req)) {
575 return;
576 }
577 if (!tevent_req_set_endtime(
578 subreq, state->ev,
579 timeval_current_ofs_usec(state->wait_usec))) {
580 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
581 return;
582 }
583 state->connect_subreq = subreq;
584 tevent_req_set_callback(subreq, open_socket_out_connected, req);
585 return;
586 }
587
588#ifdef EISCONN
589 if (sys_errno == EISCONN) {
590 tevent_req_done(req);
591 return;
592 }
593#endif
594
595 /* real error */
596 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
597}
598
599NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
600{
601 struct open_socket_out_state *state =
602 tevent_req_data(req, struct open_socket_out_state);
603 NTSTATUS status;
604
605 if (tevent_req_is_nterror(req, &status)) {
606 tevent_req_received(req);
607 return status;
608 }
609 *pfd = state->fd;
610 state->fd = -1;
611 tevent_req_received(req);
612 return NT_STATUS_OK;
613}
614
615/**
616* @brief open a socket
617*
618* @param pss a struct sockaddr_storage defining the address to connect to
619* @param port to connect to
620* @param timeout in MILLISECONDS
621* @param pfd file descriptor returned
622*
623* @return NTSTATUS code
624*/
625NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
626 int timeout, int *pfd)
627{
628 TALLOC_CTX *frame = talloc_stackframe();
629 struct tevent_context *ev;
630 struct tevent_req *req;
631 NTSTATUS status = NT_STATUS_NO_MEMORY;
632
633 ev = samba_tevent_context_init(frame);
634 if (ev == NULL) {
635 goto fail;
636 }
637
638 req = open_socket_out_send(frame, ev, pss, port, timeout);
639 if (req == NULL) {
640 goto fail;
641 }
642 if (!tevent_req_poll(req, ev)) {
643 status = NT_STATUS_INTERNAL_ERROR;
644 goto fail;
645 }
646 status = open_socket_out_recv(req, pfd);
647 fail:
648 TALLOC_FREE(frame);
649 return status;
650}
651
652struct open_socket_out_defer_state {
653 struct tevent_context *ev;
654 struct sockaddr_storage ss;
655 uint16_t port;
656 int timeout;
657 int fd;
658};
659
660static void open_socket_out_defer_waited(struct tevent_req *subreq);
661static void open_socket_out_defer_connected(struct tevent_req *subreq);
662
663struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
664 struct tevent_context *ev,
665 struct timeval wait_time,
666 const struct sockaddr_storage *pss,
667 uint16_t port,
668 int timeout)
669{
670 struct tevent_req *req, *subreq;
671 struct open_socket_out_defer_state *state;
672
673 req = tevent_req_create(mem_ctx, &state,
674 struct open_socket_out_defer_state);
675 if (req == NULL) {
676 return NULL;
677 }
678 state->ev = ev;
679 state->ss = *pss;
680 state->port = port;
681 state->timeout = timeout;
682
683 subreq = tevent_wakeup_send(
684 state, ev,
685 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
686 if (subreq == NULL) {
687 goto fail;
688 }
689 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
690 return req;
691 fail:
692 TALLOC_FREE(req);
693 return NULL;
694}
695
696static void open_socket_out_defer_waited(struct tevent_req *subreq)
697{
698 struct tevent_req *req = tevent_req_callback_data(
699 subreq, struct tevent_req);
700 struct open_socket_out_defer_state *state = tevent_req_data(
701 req, struct open_socket_out_defer_state);
702 bool ret;
703
704 ret = tevent_wakeup_recv(subreq);
705 TALLOC_FREE(subreq);
706 if (!ret) {
707 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
708 return;
709 }
710
711 subreq = open_socket_out_send(state, state->ev, &state->ss,
712 state->port, state->timeout);
713 if (tevent_req_nomem(subreq, req)) {
714 return;
715 }
716 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
717}
718
719static void open_socket_out_defer_connected(struct tevent_req *subreq)
720{
721 struct tevent_req *req = tevent_req_callback_data(
722 subreq, struct tevent_req);
723 struct open_socket_out_defer_state *state = tevent_req_data(
724 req, struct open_socket_out_defer_state);
725 NTSTATUS status;
726
727 status = open_socket_out_recv(subreq, &state->fd);
728 TALLOC_FREE(subreq);
729 if (!NT_STATUS_IS_OK(status)) {
730 tevent_req_nterror(req, status);
731 return;
732 }
733 tevent_req_done(req);
734}
735
736NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
737{
738 struct open_socket_out_defer_state *state = tevent_req_data(
739 req, struct open_socket_out_defer_state);
740 NTSTATUS status;
741
742 if (tevent_req_is_nterror(req, &status)) {
743 return status;
744 }
745 *pfd = state->fd;
746 state->fd = -1;
747 return NT_STATUS_OK;
748}
749
750/****************************************************************************
751 Open a connected UDP socket to host on port
752**************************************************************************/
753
754int open_udp_socket(const char *host, int port)
755{
756 struct sockaddr_storage ss;
757 int res;
758 socklen_t salen;
759
760 if (!interpret_string_addr(&ss, host, 0)) {
761 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
762 host));
763 return -1;
764 }
765
766 res = socket(ss.ss_family, SOCK_DGRAM, 0);
767 if (res == -1) {
768 return -1;
769 }
770
771#if defined(HAVE_IPV6)
772 if (ss.ss_family == AF_INET6) {
773 struct sockaddr_in6 *psa6;
774 psa6 = (struct sockaddr_in6 *)&ss;
775 psa6->sin6_port = htons(port);
776 if (psa6->sin6_scope_id == 0
777 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
778 setup_linklocal_scope_id(
779 (struct sockaddr *)&ss);
780 }
781 salen = sizeof(struct sockaddr_in6);
782 } else
783#endif
784 if (ss.ss_family == AF_INET) {
785 struct sockaddr_in *psa;
786 psa = (struct sockaddr_in *)&ss;
787 psa->sin_port = htons(port);
788 salen = sizeof(struct sockaddr_in);
789 } else {
790 DEBUG(1, ("unknown socket family %d", ss.ss_family));
791 close(res);
792 return -1;
793 }
794
795 if (connect(res, (struct sockaddr *)&ss, salen)) {
796 close(res);
797 return -1;
798 }
799
800 return res;
801}
802
803/*******************************************************************
804 Return the IP addr of the remote end of a socket as a string.
805 Optionally return the struct sockaddr_storage.
806 ******************************************************************/
807
808static const char *get_peer_addr_internal(int fd,
809 char *addr_buf,
810 size_t addr_buf_len,
811 struct sockaddr *pss,
812 socklen_t *plength)
813{
814 struct sockaddr_storage ss;
815 socklen_t length = sizeof(ss);
816
817 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
818
819 if (fd == -1) {
820 return addr_buf;
821 }
822
823 if (pss == NULL) {
824 pss = (struct sockaddr *)&ss;
825 plength = &length;
826 }
827
828 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
829 int level = (errno == ENOTCONN) ? 2 : 0;
830 DEBUG(level, ("getpeername failed. Error was %s\n",
831 strerror(errno)));
832 return addr_buf;
833 }
834
835 print_sockaddr_len(addr_buf,
836 addr_buf_len,
837 pss,
838 *plength);
839 return addr_buf;
840}
841
842/*******************************************************************
843 Matchname - determine if host name matches IP address. Used to
844 confirm a hostname lookup to prevent spoof attacks.
845******************************************************************/
846
847static bool matchname(const char *remotehost,
848 const struct sockaddr *pss,
849 socklen_t len)
850{
851 struct addrinfo *res = NULL;
852 struct addrinfo *ailist = NULL;
853 char addr_buf[INET6_ADDRSTRLEN];
854 bool ret = interpret_string_addr_internal(&ailist,
855 remotehost,
856 AI_ADDRCONFIG|AI_CANONNAME);
857
858 if (!ret || ailist == NULL) {
859 DEBUG(3,("matchname: getaddrinfo failed for "
860 "name %s [%s]\n",
861 remotehost,
862 gai_strerror(ret) ));
863 return false;
864 }
865
866 /*
867 * Make sure that getaddrinfo() returns the "correct" host name.
868 */
869
870 if (ailist->ai_canonname == NULL ||
871 (!strequal(remotehost, ailist->ai_canonname) &&
872 !strequal(remotehost, "localhost"))) {
873 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
874 remotehost,
875 ailist->ai_canonname ?
876 ailist->ai_canonname : "(NULL)"));
877 freeaddrinfo(ailist);
878 return false;
879 }
880
881 /* Look up the host address in the address list we just got. */
882 for (res = ailist; res; res = res->ai_next) {
883 if (!res->ai_addr) {
884 continue;
885 }
886 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
887 (const struct sockaddr *)pss)) {
888 freeaddrinfo(ailist);
889 return true;
890 }
891 }
892
893 /*
894 * The host name does not map to the original host address. Perhaps
895 * someone has compromised a name server. More likely someone botched
896 * it, but that could be dangerous, too.
897 */
898
899 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
900 print_sockaddr_len(addr_buf,
901 sizeof(addr_buf),
902 pss,
903 len),
904 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
905
906 if (ailist) {
907 freeaddrinfo(ailist);
908 }
909 return false;
910}
911
912/*******************************************************************
913 Deal with the singleton cache.
914******************************************************************/
915
916struct name_addr_pair {
917 struct sockaddr_storage ss;
918 const char *name;
919};
920
921/*******************************************************************
922 Lookup a name/addr pair. Returns memory allocated from memcache.
923******************************************************************/
924
925static bool lookup_nc(struct name_addr_pair *nc)
926{
927 DATA_BLOB tmp;
928
929 ZERO_STRUCTP(nc);
930
931 if (!memcache_lookup(
932 NULL, SINGLETON_CACHE,
933 data_blob_string_const_null("get_peer_name"),
934 &tmp)) {
935 return false;
936 }
937
938 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
939 nc->name = (const char *)tmp.data + sizeof(nc->ss);
940 return true;
941}
942
943/*******************************************************************
944 Save a name/addr pair.
945******************************************************************/
946
947static void store_nc(const struct name_addr_pair *nc)
948{
949 DATA_BLOB tmp;
950 size_t namelen = strlen(nc->name);
951
952 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
953 if (!tmp.data) {
954 return;
955 }
956 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
957 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
958
959 memcache_add(NULL, SINGLETON_CACHE,
960 data_blob_string_const_null("get_peer_name"),
961 tmp);
962 data_blob_free(&tmp);
963}
964
965/*******************************************************************
966 Return the IP addr of the remote end of a socket as a string.
967 ******************************************************************/
968
969const char *get_peer_addr(int fd, char *addr, size_t addr_len)
970{
971 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
972}
973
974int get_remote_hostname(const struct tsocket_address *remote_address,
975 char **name,
976 TALLOC_CTX *mem_ctx)
977{
978 char name_buf[MAX_DNS_NAME_LENGTH];
979 char tmp_name[MAX_DNS_NAME_LENGTH];
980 struct name_addr_pair nc;
981 struct sockaddr_storage ss;
982 ssize_t len;
983 int rc;
984
985 if (!lp_hostname_lookups()) {
986 nc.name = tsocket_address_inet_addr_string(remote_address,
987 mem_ctx);
988 if (nc.name == NULL) {
989 return -1;
990 }
991
992 len = tsocket_address_bsd_sockaddr(remote_address,
993 (struct sockaddr *) &nc.ss,
994 sizeof(struct sockaddr_storage));
995 if (len < 0) {
996 return -1;
997 }
998
999 store_nc(&nc);
1000 lookup_nc(&nc);
1001
1002 if (nc.name == NULL) {
1003 *name = talloc_strdup(mem_ctx, "UNKNOWN");
1004 } else {
1005 *name = talloc_strdup(mem_ctx, nc.name);
1006 }
1007 return 0;
1008 }
1009
1010 lookup_nc(&nc);
1011
1012 ZERO_STRUCT(ss);
1013
1014 len = tsocket_address_bsd_sockaddr(remote_address,
1015 (struct sockaddr *) &ss,
1016 sizeof(struct sockaddr_storage));
1017 if (len < 0) {
1018 return -1;
1019 }
1020
1021 /* it might be the same as the last one - save some DNS work */
1022 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1023 if (nc.name == NULL) {
1024 *name = talloc_strdup(mem_ctx, "UNKNOWN");
1025 } else {
1026 *name = talloc_strdup(mem_ctx, nc.name);
1027 }
1028 return 0;
1029 }
1030
1031 /* Look up the remote host name. */
1032 rc = sys_getnameinfo((struct sockaddr *) &ss,
1033 len,
1034 name_buf,
1035 sizeof(name_buf),
1036 NULL,
1037 0,
1038 0);
1039 if (rc < 0) {
1040 char *p;
1041
1042 p = tsocket_address_inet_addr_string(remote_address, mem_ctx);
1043 if (p == NULL) {
1044 return -1;
1045 }
1046
1047 DEBUG(1,("getnameinfo failed for %s with error %s\n",
1048 p,
1049 gai_strerror(rc)));
1050 strlcpy(name_buf, p, sizeof(name_buf));
1051
1052 TALLOC_FREE(p);
1053 } else {
1054 if (!matchname(name_buf, (struct sockaddr *)&ss, len)) {
1055 DEBUG(0,("matchname failed on %s\n", name_buf));
1056 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1057 }
1058 }
1059
1060 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1061 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1062 if (strstr(name_buf,"..")) {
1063 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1064 }
1065
1066 nc.name = name_buf;
1067 nc.ss = ss;
1068
1069 store_nc(&nc);
1070 lookup_nc(&nc);
1071
1072 if (nc.name == NULL) {
1073 *name = talloc_strdup(mem_ctx, "UNKNOWN");
1074 } else {
1075 *name = talloc_strdup(mem_ctx, nc.name);
1076 }
1077
1078 return 0;
1079}
1080
1081/*******************************************************************
1082 Create protected unix domain socket.
1083
1084 Some unixes cannot set permissions on a ux-dom-sock, so we
1085 have to make sure that the directory contains the protection
1086 permissions instead.
1087 ******************************************************************/
1088
1089int create_pipe_sock(const char *socket_dir,
1090 const char *socket_name,
1091 mode_t dir_perms)
1092{
1093#ifdef HAVE_UNIXSOCKET
1094 struct sockaddr_un sunaddr;
1095 bool ok;
1096 int sock = -1;
1097 mode_t old_umask;
1098 char *path = NULL;
1099
1100 old_umask = umask(0);
1101
1102 ok = directory_create_or_exist_strict(socket_dir,
1103 sec_initial_uid(),
1104 dir_perms);
1105 if (!ok) {
1106 goto out_close;
1107 }
1108
1109 /* Create the socket file */
1110 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1111
1112 if (sock == -1) {
1113 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1114 strerror(errno) ));
1115 goto out_close;
1116 }
1117
1118 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1119 goto out_close;
1120 }
1121
1122 unlink(path);
1123 memset(&sunaddr, 0, sizeof(sunaddr));
1124 sunaddr.sun_family = AF_UNIX;
1125 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1126
1127 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1128 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1129 strerror(errno)));
1130 goto out_close;
1131 }
1132
1133 SAFE_FREE(path);
1134
1135 umask(old_umask);
1136 return sock;
1137
1138out_close:
1139 SAFE_FREE(path);
1140 if (sock != -1)
1141 close(sock);
1142
1143 umask(old_umask);
1144 return -1;
1145
1146#else
1147 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1148 return -1;
1149#endif /* HAVE_UNIXSOCKET */
1150}
1151
1152/****************************************************************************
1153 Get my own canonical name, including domain.
1154****************************************************************************/
1155
1156const char *get_mydnsfullname(void)
1157{
1158 struct addrinfo *res = NULL;
1159 char my_hostname[HOST_NAME_MAX];
1160 bool ret;
1161 DATA_BLOB tmp;
1162
1163 if (memcache_lookup(NULL, SINGLETON_CACHE,
1164 data_blob_string_const_null("get_mydnsfullname"),
1165 &tmp)) {
1166 SMB_ASSERT(tmp.length > 0);
1167 return (const char *)tmp.data;
1168 }
1169
1170 /* get my host name */
1171 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1172 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1173 return NULL;
1174 }
1175
1176 /* Ensure null termination. */
1177 my_hostname[sizeof(my_hostname)-1] = '\0';
1178
1179 ret = interpret_string_addr_internal(&res,
1180 my_hostname,
1181 AI_ADDRCONFIG|AI_CANONNAME);
1182
1183 if (!ret || res == NULL) {
1184 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1185 "name %s [%s]\n",
1186 my_hostname,
1187 gai_strerror(ret) ));
1188 return NULL;
1189 }
1190
1191 /*
1192 * Make sure that getaddrinfo() returns the "correct" host name.
1193 */
1194
1195 if (res->ai_canonname == NULL) {
1196 DEBUG(3,("get_mydnsfullname: failed to get "
1197 "canonical name for %s\n",
1198 my_hostname));
1199 freeaddrinfo(res);
1200 return NULL;
1201 }
1202
1203 /* This copies the data, so we must do a lookup
1204 * afterwards to find the value to return.
1205 */
1206
1207 memcache_add(NULL, SINGLETON_CACHE,
1208 data_blob_string_const_null("get_mydnsfullname"),
1209 data_blob_string_const_null(res->ai_canonname));
1210
1211 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1212 data_blob_string_const_null("get_mydnsfullname"),
1213 &tmp)) {
1214 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1215 strlen(res->ai_canonname) + 1);
1216 }
1217
1218 freeaddrinfo(res);
1219
1220 return (const char *)tmp.data;
1221}
1222
1223/************************************************************
1224 Is this my ip address ?
1225************************************************************/
1226
1227static bool is_my_ipaddr(const char *ipaddr_str)
1228{
1229 struct sockaddr_storage ss;
1230 struct iface_struct *nics;
1231 int i, n;
1232
1233 if (!interpret_string_addr(&ss, ipaddr_str, AI_NUMERICHOST)) {
1234 return false;
1235 }
1236
1237 if (is_zero_addr(&ss)) {
1238 return false;
1239 }
1240
1241 if (ismyaddr((struct sockaddr *)&ss) ||
1242 is_loopback_addr((struct sockaddr *)&ss)) {
1243 return true;
1244 }
1245
1246 n = get_interfaces(talloc_tos(), &nics);
1247 for (i=0; i<n; i++) {
1248 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1249 TALLOC_FREE(nics);
1250 return true;
1251 }
1252 }
1253 TALLOC_FREE(nics);
1254 return false;
1255}
1256
1257/************************************************************
1258 Is this my name ?
1259************************************************************/
1260
1261bool is_myname_or_ipaddr(const char *s)
1262{
1263 TALLOC_CTX *ctx = talloc_tos();
1264 char *name = NULL;
1265 const char *dnsname;
1266 char *servername = NULL;
1267
1268 if (!s) {
1269 return false;
1270 }
1271
1272 /* Santize the string from '\\name' */
1273 name = talloc_strdup(ctx, s);
1274 if (!name) {
1275 return false;
1276 }
1277
1278 servername = strrchr_m(name, '\\' );
1279 if (!servername) {
1280 servername = name;
1281 } else {
1282 servername++;
1283 }
1284
1285 /* Optimize for the common case */
1286 if (strequal(servername, lp_netbios_name())) {
1287 return true;
1288 }
1289
1290 /* Check for an alias */
1291 if (is_myname(servername)) {
1292 return true;
1293 }
1294
1295 /* Check for loopback */
1296 if (strequal(servername, "127.0.0.1") ||
1297 strequal(servername, "::1")) {
1298 return true;
1299 }
1300
1301 if (strequal(servername, "localhost")) {
1302 return true;
1303 }
1304
1305 /* Maybe it's my dns name */
1306 dnsname = get_mydnsfullname();
1307 if (dnsname && strequal(servername, dnsname)) {
1308 return true;
1309 }
1310
1311 /* Maybe its an IP address? */
1312 if (is_ipaddress(servername)) {
1313 return is_my_ipaddr(servername);
1314 }
1315
1316 /* Handle possible CNAME records - convert to an IP addr. list. */
1317 {
1318 /* Use DNS to resolve the name, check all addresses. */
1319 struct addrinfo *p = NULL;
1320 struct addrinfo *res = NULL;
1321
1322 if (!interpret_string_addr_internal(&res,
1323 servername,
1324 AI_ADDRCONFIG)) {
1325 return false;
1326 }
1327
1328 for (p = res; p; p = p->ai_next) {
1329 char addr[INET6_ADDRSTRLEN];
1330 struct sockaddr_storage ss;
1331
1332 ZERO_STRUCT(ss);
1333 memcpy(&ss, p->ai_addr, p->ai_addrlen);
1334 print_sockaddr(addr,
1335 sizeof(addr),
1336 &ss);
1337 if (is_my_ipaddr(addr)) {
1338 freeaddrinfo(res);
1339 return true;
1340 }
1341 }
1342 freeaddrinfo(res);
1343 }
1344
1345 /* No match */
1346 return false;
1347}
1348
1349struct getaddrinfo_state {
1350 const char *node;
1351 const char *service;
1352 const struct addrinfo *hints;
1353 struct addrinfo *res;
1354 int ret;
1355};
1356
1357static void getaddrinfo_do(void *private_data);
1358static void getaddrinfo_done(struct tevent_req *subreq);
1359
1360struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1361 struct tevent_context *ev,
1362 struct fncall_context *ctx,
1363 const char *node,
1364 const char *service,
1365 const struct addrinfo *hints)
1366{
1367 struct tevent_req *req, *subreq;
1368 struct getaddrinfo_state *state;
1369
1370 req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1371 if (req == NULL) {
1372 return NULL;
1373 }
1374
1375 state->node = node;
1376 state->service = service;
1377 state->hints = hints;
1378
1379 subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1380 if (tevent_req_nomem(subreq, req)) {
1381 return tevent_req_post(req, ev);
1382 }
1383 tevent_req_set_callback(subreq, getaddrinfo_done, req);
1384 return req;
1385}
1386
1387static void getaddrinfo_do(void *private_data)
1388{
1389 struct getaddrinfo_state *state =
1390 talloc_get_type_abort(private_data, struct getaddrinfo_state);
1391
1392 state->ret = getaddrinfo(state->node, state->service, state->hints,
1393 &state->res);
1394}
1395
1396static void getaddrinfo_done(struct tevent_req *subreq)
1397{
1398 struct tevent_req *req = tevent_req_callback_data(
1399 subreq, struct tevent_req);
1400 int ret, err;
1401
1402 ret = fncall_recv(subreq, &err);
1403 TALLOC_FREE(subreq);
1404 if (ret == -1) {
1405 tevent_req_error(req, err);
1406 return;
1407 }
1408 tevent_req_done(req);
1409}
1410
1411int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1412{
1413 struct getaddrinfo_state *state = tevent_req_data(
1414 req, struct getaddrinfo_state);
1415 int err;
1416
1417 if (tevent_req_is_unix_error(req, &err)) {
1418 switch(err) {
1419 case ENOMEM:
1420 return EAI_MEMORY;
1421 default:
1422 return EAI_FAIL;
1423 }
1424 }
1425 if (state->ret == 0) {
1426 *res = state->res;
1427 }
1428 return state->ret;
1429}
1430
1431int poll_one_fd(int fd, int events, int timeout, int *revents)
1432{
1433 struct pollfd pfd;
1434 int ret;
1435
1436 pfd.fd = fd;
1437 pfd.events = events;
1438
1439 ret = poll(&pfd, 1, timeout);
1440
1441 /*
1442 * Assign whatever poll did, even in the ret<=0 case.
1443 */
1444 *revents = pfd.revents;
1445
1446 return ret;
1447}
1448
1449int poll_intr_one_fd(int fd, int events, int timeout, int *revents)
1450{
1451 struct pollfd pfd;
1452 int ret;
1453
1454 pfd.fd = fd;
1455 pfd.events = events;
1456
1457 ret = sys_poll_intr(&pfd, 1, timeout);
1458 if (ret <= 0) {
1459 *revents = 0;
1460 return ret;
1461 }
1462 *revents = pfd.revents;
1463 return 1;
1464}
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