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s3: Adding TCP_KEEPALIVE_THRESHOLD and TCP_KEEPALIVE_ABORT_THRESHOLD to the list...
[Samba/gebeck_regimport.git] / source3 / lib / util_sock.c
blob6782249bf6e5ad554fe7c22b55b07efca6e56048
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 "memcache.h"
24 #include "../lib/async_req/async_sock.h"
25 #include "../lib/util/select.h"
26
27 /****************************************************************************
28 Get a port number in host byte order from a sockaddr_storage.
29 ****************************************************************************/
30
31 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
32 {
33 uint16_t port = 0;
34
35 if (pss->ss_family != AF_INET) {
36 #if defined(HAVE_IPV6)
37 /* IPv6 */
38 const struct sockaddr_in6 *sa6 =
39 (const struct sockaddr_in6 *)pss;
40 port = ntohs(sa6->sin6_port);
41 #endif
42 } else {
43 const struct sockaddr_in *sa =
44 (const struct sockaddr_in *)pss;
45 port = ntohs(sa->sin_port);
46 }
47 return port;
48 }
49
50 /****************************************************************************
51 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
52 ****************************************************************************/
53
54 static char *print_sockaddr_len(char *dest,
55 size_t destlen,
56 const struct sockaddr *psa,
57 socklen_t psalen)
58 {
59 if (destlen > 0) {
60 dest[0] = '\0';
61 }
62 (void)sys_getnameinfo(psa,
63 psalen,
64 dest, destlen,
65 NULL, 0,
66 NI_NUMERICHOST);
67 return dest;
68 }
69
70 /****************************************************************************
71 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
72 ****************************************************************************/
73
74 char *print_sockaddr(char *dest,
75 size_t destlen,
76 const struct sockaddr_storage *psa)
77 {
78 return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
79 sizeof(struct sockaddr_storage));
80 }
81
82 /****************************************************************************
83 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
84 ****************************************************************************/
85
86 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
87 const struct sockaddr_storage *pss)
88 {
89 char addr[INET6_ADDRSTRLEN];
90 char *dest = NULL;
91 int ret;
92
93 /* Linux getnameinfo() man pages says port is unitialized if
94 service name is NULL. */
95
96 ret = sys_getnameinfo((const struct sockaddr *)pss,
97 sizeof(struct sockaddr_storage),
98 addr, sizeof(addr),
99 NULL, 0,
100 NI_NUMERICHOST);
101 if (ret != 0) {
102 return NULL;
103 }
104
105 if (pss->ss_family != AF_INET) {
106 #if defined(HAVE_IPV6)
107 dest = talloc_asprintf(ctx, "[%s]", addr);
108 #else
109 return NULL;
110 #endif
111 } else {
112 dest = talloc_asprintf(ctx, "%s", addr);
113 }
114
115 return dest;
116 }
117
118 /****************************************************************************
119 Return the string of an IP address (IPv4 or IPv6).
120 ****************************************************************************/
121
122 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
123 {
124 struct sockaddr_storage sa;
125 socklen_t length = sizeof(sa);
126
127 /* Ok, returning a hard coded IPv4 address
128 * is bogus, but it's just as bogus as a
129 * zero IPv6 address. No good choice here.
130 */
131
132 strlcpy(addr_buf, "0.0.0.0", addr_len);
133
134 if (fd == -1) {
135 return addr_buf;
136 }
137
138 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
139 DEBUG(0,("getsockname failed. Error was %s\n",
140 strerror(errno) ));
141 return addr_buf;
142 }
143
144 return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
145 }
146
147 /****************************************************************************
148 Return the port number we've bound to on a socket.
149 ****************************************************************************/
150
151 int get_socket_port(int fd)
152 {
153 struct sockaddr_storage sa;
154 socklen_t length = sizeof(sa);
155
156 if (fd == -1) {
157 return -1;
158 }
159
160 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
161 int level = (errno == ENOTCONN) ? 2 : 0;
162 DEBUG(level, ("getpeername failed. Error was %s\n",
163 strerror(errno)));
164 return -1;
165 }
166
167 #if defined(HAVE_IPV6)
168 if (sa.ss_family == AF_INET6) {
169 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
170 }
171 #endif
172 if (sa.ss_family == AF_INET) {
173 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
174 }
175 return -1;
176 }
177
178 const char *client_name(int fd)
179 {
180 return get_peer_name(fd,false);
181 }
182
183 const char *client_addr(int fd, char *addr, size_t addrlen)
184 {
185 return get_peer_addr(fd,addr,addrlen);
186 }
187
188 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
189 {
190 return get_socket_addr(fd, addr, addr_len);
191 }
192
193 #if 0
194 /* Not currently used. JRA. */
195 int client_socket_port(int fd)
196 {
197 return get_socket_port(fd);
198 }
199 #endif
200
201 /****************************************************************************
202 Accessor functions to make thread-safe code easier later...
203 ****************************************************************************/
204
205 void set_smb_read_error(enum smb_read_errors *pre,
206 enum smb_read_errors newerr)
207 {
208 if (pre) {
209 *pre = newerr;
210 }
211 }
212
213 void cond_set_smb_read_error(enum smb_read_errors *pre,
214 enum smb_read_errors newerr)
215 {
216 if (pre && *pre == SMB_READ_OK) {
217 *pre = newerr;
218 }
219 }
220
221 /****************************************************************************
222 Determine if a file descriptor is in fact a socket.
223 ****************************************************************************/
224
225 bool is_a_socket(int fd)
226 {
227 int v;
228 socklen_t l;
229 l = sizeof(int);
230 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
231 }
232
233 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
234
235 typedef struct smb_socket_option {
236 const char *name;
237 int level;
238 int option;
239 int value;
240 int opttype;
241 } smb_socket_option;
242
243 static const smb_socket_option socket_options[] = {
244 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
245 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
246 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
247 #ifdef TCP_NODELAY
248 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
249 #endif
250 #ifdef TCP_KEEPCNT
251 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
252 #endif
253 #ifdef TCP_KEEPIDLE
254 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
255 #endif
256 #ifdef TCP_KEEPINTVL
257 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
258 #endif
259 #ifdef IPTOS_LOWDELAY
260 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
261 #endif
262 #ifdef IPTOS_THROUGHPUT
263 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
264 #endif
265 #ifdef SO_REUSEPORT
266 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
267 #endif
268 #ifdef SO_SNDBUF
269 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
270 #endif
271 #ifdef SO_RCVBUF
272 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
273 #endif
274 #ifdef SO_SNDLOWAT
275 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
276 #endif
277 #ifdef SO_RCVLOWAT
278 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
279 #endif
280 #ifdef SO_SNDTIMEO
281 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
282 #endif
283 #ifdef SO_RCVTIMEO
284 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
285 #endif
286 #ifdef TCP_FASTACK
287 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
288 #endif
289 #ifdef TCP_QUICKACK
290 {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL},
291 #endif
292 #ifdef TCP_KEEPALIVE_THRESHOLD
293 {"TCP_KEEPALIVE_THRESHOLD", IPPROTO_TCP, TCP_KEEPALIVE_THRESHOLD, 0, OPT_INT},
294 #endif
295 #ifdef TCP_KEEPALIVE_ABORT_THRESHOLD
296 {"TCP_KEEPALIVE_ABORT_THRESHOLD", IPPROTO_TCP, TCP_KEEPALIVE_ABORT_THRESHOLD, 0, OPT_INT},
297 #endif
298 {NULL,0,0,0,0}};
299
300 /****************************************************************************
301 Print socket options.
302 ****************************************************************************/
303
304 static void print_socket_options(int s)
305 {
306 int value;
307 socklen_t vlen = 4;
308 const smb_socket_option *p = &socket_options[0];
309
310 /* wrapped in if statement to prevent streams
311 * leak in SCO Openserver 5.0 */
312 /* reported on samba-technical --jerry */
313 if ( DEBUGLEVEL >= 5 ) {
314 DEBUG(5,("Socket options:\n"));
315 for (; p->name != NULL; p++) {
316 if (getsockopt(s, p->level, p->option,
317 (void *)&value, &vlen) == -1) {
318 DEBUGADD(5,("\tCould not test socket option %s.\n",
319 p->name));
320 } else {
321 DEBUGADD(5,("\t%s = %d\n",
322 p->name,value));
323 }
324 }
325 }
326 }
327
328 /****************************************************************************
329 Set user socket options.
330 ****************************************************************************/
331
332 void set_socket_options(int fd, const char *options)
333 {
334 TALLOC_CTX *ctx = talloc_stackframe();
335 char *tok;
336
337 while (next_token_talloc(ctx, &options, &tok," \t,")) {
338 int ret=0,i;
339 int value = 1;
340 char *p;
341 bool got_value = false;
342
343 if ((p = strchr_m(tok,'='))) {
344 *p = 0;
345 value = atoi(p+1);
346 got_value = true;
347 }
348
349 for (i=0;socket_options[i].name;i++)
350 if (strequal(socket_options[i].name,tok))
351 break;
352
353 if (!socket_options[i].name) {
354 DEBUG(0,("Unknown socket option %s\n",tok));
355 continue;
356 }
357
358 switch (socket_options[i].opttype) {
359 case OPT_BOOL:
360 case OPT_INT:
361 ret = setsockopt(fd,socket_options[i].level,
362 socket_options[i].option,
363 (char *)&value,sizeof(int));
364 break;
365
366 case OPT_ON:
367 if (got_value)
368 DEBUG(0,("syntax error - %s "
369 "does not take a value\n",tok));
370
371 {
372 int on = socket_options[i].value;
373 ret = setsockopt(fd,socket_options[i].level,
374 socket_options[i].option,
375 (char *)&on,sizeof(int));
376 }
377 break;
378 }
379
380 if (ret != 0) {
381 /* be aware that some systems like Solaris return
382 * EINVAL to a setsockopt() call when the client
383 * sent a RST previously - no need to worry */
384 DEBUG(2,("Failed to set socket option %s (Error %s)\n",
385 tok, strerror(errno) ));
386 }
387 }
388
389 TALLOC_FREE(ctx);
390 print_socket_options(fd);
391 }
392
393 /****************************************************************************
394 Read from a socket.
395 ****************************************************************************/
396
397 ssize_t read_udp_v4_socket(int fd,
398 char *buf,
399 size_t len,
400 struct sockaddr_storage *psa)
401 {
402 ssize_t ret;
403 socklen_t socklen = sizeof(*psa);
404 struct sockaddr_in *si = (struct sockaddr_in *)psa;
405
406 memset((char *)psa,'\0',socklen);
407
408 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
409 (struct sockaddr *)psa,&socklen);
410 if (ret <= 0) {
411 /* Don't print a low debug error for a non-blocking socket. */
412 if (errno == EAGAIN) {
413 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
414 } else {
415 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
416 strerror(errno)));
417 }
418 return 0;
419 }
420
421 if (psa->ss_family != AF_INET) {
422 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
423 "(not IPv4)\n", (int)psa->ss_family));
424 return 0;
425 }
426
427 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
428 inet_ntoa(si->sin_addr),
429 si->sin_port,
430 (unsigned long)ret));
431
432 return ret;
433 }
434
435 /****************************************************************************
436 Read data from a file descriptor with a timout in msec.
437 mincount = if timeout, minimum to read before returning
438 maxcount = number to be read.
439 time_out = timeout in milliseconds
440 NB. This can be called with a non-socket fd, don't change
441 sys_read() to sys_recv() or other socket call.
442 ****************************************************************************/
443
444 NTSTATUS read_fd_with_timeout(int fd, char *buf,
445 size_t mincnt, size_t maxcnt,
446 unsigned int time_out,
447 size_t *size_ret)
448 {
449 fd_set fds;
450 int selrtn;
451 ssize_t readret;
452 size_t nread = 0;
453 struct timeval timeout;
454
455 /* just checking .... */
456 if (maxcnt <= 0)
457 return NT_STATUS_OK;
458
459 /* Blocking read */
460 if (time_out == 0) {
461 if (mincnt == 0) {
462 mincnt = maxcnt;
463 }
464
465 while (nread < mincnt) {
466 readret = sys_read(fd, buf + nread, maxcnt - nread);
467
468 if (readret == 0) {
469 DEBUG(5,("read_fd_with_timeout: "
470 "blocking read. EOF from client.\n"));
471 return NT_STATUS_END_OF_FILE;
472 }
473
474 if (readret == -1) {
475 return map_nt_error_from_unix(errno);
476 }
477 nread += readret;
478 }
479 goto done;
480 }
481
482 /* Most difficult - timeout read */
483 /* If this is ever called on a disk file and
484 mincnt is greater then the filesize then
485 system performance will suffer severely as
486 select always returns true on disk files */
487
488 /* Set initial timeout */
489 timeout.tv_sec = (time_t)(time_out / 1000);
490 timeout.tv_usec = (long)(1000 * (time_out % 1000));
491
492 for (nread=0; nread < mincnt; ) {
493 FD_ZERO(&fds);
494 FD_SET(fd,&fds);
495
496 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
497
498 /* Check if error */
499 if (selrtn == -1) {
500 return map_nt_error_from_unix(errno);
501 }
502
503 /* Did we timeout ? */
504 if (selrtn == 0) {
505 DEBUG(10,("read_fd_with_timeout: timeout read. "
506 "select timed out.\n"));
507 return NT_STATUS_IO_TIMEOUT;
508 }
509
510 readret = sys_read(fd, buf+nread, maxcnt-nread);
511
512 if (readret == 0) {
513 /* we got EOF on the file descriptor */
514 DEBUG(5,("read_fd_with_timeout: timeout read. "
515 "EOF from client.\n"));
516 return NT_STATUS_END_OF_FILE;
517 }
518
519 if (readret == -1) {
520 return map_nt_error_from_unix(errno);
521 }
522
523 nread += readret;
524 }
525
526 done:
527 /* Return the number we got */
528 if (size_ret) {
529 *size_ret = nread;
530 }
531 return NT_STATUS_OK;
532 }
533
534 /****************************************************************************
535 Read data from an fd, reading exactly N bytes.
536 NB. This can be called with a non-socket fd, don't add dependencies
537 on socket calls.
538 ****************************************************************************/
539
540 NTSTATUS read_data(int fd, char *buffer, size_t N)
541 {
542 return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
543 }
544
545 /****************************************************************************
546 Write all data from an iov array
547 NB. This can be called with a non-socket fd, don't add dependencies
548 on socket calls.
549 ****************************************************************************/
550
551 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
552 {
553 int i;
554 size_t to_send;
555 ssize_t thistime;
556 size_t sent;
557 struct iovec *iov_copy, *iov;
558
559 to_send = 0;
560 for (i=0; i<iovcnt; i++) {
561 to_send += orig_iov[i].iov_len;
562 }
563
564 thistime = sys_writev(fd, orig_iov, iovcnt);
565 if ((thistime <= 0) || (thistime == to_send)) {
566 return thistime;
567 }
568 sent = thistime;
569
570 /*
571 * We could not send everything in one call. Make a copy of iov that
572 * we can mess with. We keep a copy of the array start in iov_copy for
573 * the TALLOC_FREE, because we're going to modify iov later on,
574 * discarding elements.
575 */
576
577 iov_copy = (struct iovec *)TALLOC_MEMDUP(
578 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
579
580 if (iov_copy == NULL) {
581 errno = ENOMEM;
582 return -1;
583 }
584 iov = iov_copy;
585
586 while (sent < to_send) {
587 /*
588 * We have to discard "thistime" bytes from the beginning
589 * iov array, "thistime" contains the number of bytes sent
590 * via writev last.
591 */
592 while (thistime > 0) {
593 if (thistime < iov[0].iov_len) {
594 char *new_base =
595 (char *)iov[0].iov_base + thistime;
596 iov[0].iov_base = (void *)new_base;
597 iov[0].iov_len -= thistime;
598 break;
599 }
600 thistime -= iov[0].iov_len;
601 iov += 1;
602 iovcnt -= 1;
603 }
604
605 thistime = sys_writev(fd, iov, iovcnt);
606 if (thistime <= 0) {
607 break;
608 }
609 sent += thistime;
610 }
611
612 TALLOC_FREE(iov_copy);
613 return sent;
614 }
615
616 /****************************************************************************
617 Write data to a fd.
618 NB. This can be called with a non-socket fd, don't add dependencies
619 on socket calls.
620 ****************************************************************************/
621
622 ssize_t write_data(int fd, const char *buffer, size_t N)
623 {
624 struct iovec iov;
625
626 iov.iov_base = CONST_DISCARD(void *, buffer);
627 iov.iov_len = N;
628 return write_data_iov(fd, &iov, 1);
629 }
630
631 /****************************************************************************
632 Send a keepalive packet (rfc1002).
633 ****************************************************************************/
634
635 bool send_keepalive(int client)
636 {
637 unsigned char buf[4];
638
639 buf[0] = SMBkeepalive;
640 buf[1] = buf[2] = buf[3] = 0;
641
642 return(write_data(client,(char *)buf,4) == 4);
643 }
644
645 /****************************************************************************
646 Read 4 bytes of a smb packet and return the smb length of the packet.
647 Store the result in the buffer.
648 This version of the function will return a length of zero on receiving
649 a keepalive packet.
650 Timeout is in milliseconds.
651 ****************************************************************************/
652
653 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
654 unsigned int timeout,
655 size_t *len)
656 {
657 int msg_type;
658 NTSTATUS status;
659
660 status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
661
662 if (!NT_STATUS_IS_OK(status)) {
663 return status;
664 }
665
666 *len = smb_len(inbuf);
667 msg_type = CVAL(inbuf,0);
668
669 if (msg_type == SMBkeepalive) {
670 DEBUG(5,("Got keepalive packet\n"));
671 }
672
673 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
674
675 return NT_STATUS_OK;
676 }
677
678 /****************************************************************************
679 Read an smb from a fd.
680 The timeout is in milliseconds.
681 This function will return on receipt of a session keepalive packet.
682 maxlen is the max number of bytes to return, not including the 4 byte
683 length. If zero it means buflen limit.
684 Doesn't check the MAC on signed packets.
685 ****************************************************************************/
686
687 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
688 size_t maxlen, size_t *p_len)
689 {
690 size_t len;
691 NTSTATUS status;
692
693 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
694
695 if (!NT_STATUS_IS_OK(status)) {
696 DEBUG(0, ("read_fd_with_timeout failed, read "
697 "error = %s.\n", nt_errstr(status)));
698 return status;
699 }
700
701 if (len > buflen) {
702 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
703 (unsigned long)len));
704 return NT_STATUS_INVALID_PARAMETER;
705 }
706
707 if(len > 0) {
708 if (maxlen) {
709 len = MIN(len,maxlen);
710 }
711
712 status = read_fd_with_timeout(
713 fd, buffer+4, len, len, timeout, &len);
714
715 if (!NT_STATUS_IS_OK(status)) {
716 DEBUG(0, ("read_fd_with_timeout failed, read error = "
717 "%s.\n", nt_errstr(status)));
718 return status;
719 }
720
721 /* not all of samba3 properly checks for packet-termination
722 * of strings. This ensures that we don't run off into
723 * empty space. */
724 SSVAL(buffer+4,len, 0);
725 }
726
727 *p_len = len;
728 return NT_STATUS_OK;
729 }
730
731 /****************************************************************************
732 Open a socket of the specified type, port, and address for incoming data.
733 ****************************************************************************/
734
735 int open_socket_in(int type,
736 uint16_t port,
737 int dlevel,
738 const struct sockaddr_storage *psock,
739 bool rebind)
740 {
741 struct sockaddr_storage sock;
742 int res;
743 socklen_t slen = sizeof(struct sockaddr_in);
744
745 sock = *psock;
746
747 #if defined(HAVE_IPV6)
748 if (sock.ss_family == AF_INET6) {
749 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
750 slen = sizeof(struct sockaddr_in6);
751 }
752 #endif
753 if (sock.ss_family == AF_INET) {
754 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
755 }
756
757 res = socket(sock.ss_family, type, 0 );
758 if( res == -1 ) {
759 if( DEBUGLVL(0) ) {
760 dbgtext( "open_socket_in(): socket() call failed: " );
761 dbgtext( "%s\n", strerror( errno ) );
762 }
763 return -1;
764 }
765
766 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
767 {
768 int val = rebind ? 1 : 0;
769 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
770 (char *)&val,sizeof(val)) == -1 ) {
771 if( DEBUGLVL( dlevel ) ) {
772 dbgtext( "open_socket_in(): setsockopt: " );
773 dbgtext( "SO_REUSEADDR = %s ",
774 val?"true":"false" );
775 dbgtext( "on port %d failed ", port );
776 dbgtext( "with error = %s\n", strerror(errno) );
777 }
778 }
779 #ifdef SO_REUSEPORT
780 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
781 (char *)&val,sizeof(val)) == -1 ) {
782 if( DEBUGLVL( dlevel ) ) {
783 dbgtext( "open_socket_in(): setsockopt: ");
784 dbgtext( "SO_REUSEPORT = %s ",
785 val?"true":"false");
786 dbgtext( "on port %d failed ", port);
787 dbgtext( "with error = %s\n", strerror(errno));
788 }
789 }
790 #endif /* SO_REUSEPORT */
791 }
792
793 /* now we've got a socket - we need to bind it */
794 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
795 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
796 port == SMB_PORT2 || port == NMB_PORT) ) {
797 char addr[INET6_ADDRSTRLEN];
798 print_sockaddr(addr, sizeof(addr),
799 &sock);
800 dbgtext( "bind failed on port %d ", port);
801 dbgtext( "socket_addr = %s.\n", addr);
802 dbgtext( "Error = %s\n", strerror(errno));
803 }
804 close(res);
805 return -1;
806 }
807
808 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
809 return( res );
810 }
811
812 struct open_socket_out_state {
813 int fd;
814 struct event_context *ev;
815 struct sockaddr_storage ss;
816 socklen_t salen;
817 uint16_t port;
818 int wait_nsec;
819 };
820
821 static void open_socket_out_connected(struct tevent_req *subreq);
822
823 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
824 {
825 if (s->fd != -1) {
826 close(s->fd);
827 }
828 return 0;
829 }
830
831 /****************************************************************************
832 Create an outgoing socket. timeout is in milliseconds.
833 **************************************************************************/
834
835 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
836 struct event_context *ev,
837 const struct sockaddr_storage *pss,
838 uint16_t port,
839 int timeout)
840 {
841 char addr[INET6_ADDRSTRLEN];
842 struct tevent_req *result, *subreq;
843 struct open_socket_out_state *state;
844 NTSTATUS status;
845
846 result = tevent_req_create(mem_ctx, &state,
847 struct open_socket_out_state);
848 if (result == NULL) {
849 return NULL;
850 }
851 state->ev = ev;
852 state->ss = *pss;
853 state->port = port;
854 state->wait_nsec = 10000;
855 state->salen = -1;
856
857 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
858 if (state->fd == -1) {
859 status = map_nt_error_from_unix(errno);
860 goto post_status;
861 }
862 talloc_set_destructor(state, open_socket_out_state_destructor);
863
864 if (!tevent_req_set_endtime(
865 result, ev, timeval_current_ofs(0, timeout*1000))) {
866 goto fail;
867 }
868
869 #if defined(HAVE_IPV6)
870 if (pss->ss_family == AF_INET6) {
871 struct sockaddr_in6 *psa6;
872 psa6 = (struct sockaddr_in6 *)&state->ss;
873 psa6->sin6_port = htons(port);
874 if (psa6->sin6_scope_id == 0
875 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
876 setup_linklocal_scope_id(
877 (struct sockaddr *)&(state->ss));
878 }
879 state->salen = sizeof(struct sockaddr_in6);
880 }
881 #endif
882 if (pss->ss_family == AF_INET) {
883 struct sockaddr_in *psa;
884 psa = (struct sockaddr_in *)&state->ss;
885 psa->sin_port = htons(port);
886 state->salen = sizeof(struct sockaddr_in);
887 }
888
889 if (pss->ss_family == AF_UNIX) {
890 state->salen = sizeof(struct sockaddr_un);
891 }
892
893 print_sockaddr(addr, sizeof(addr), &state->ss);
894 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
895
896 subreq = async_connect_send(state, state->ev, state->fd,
897 (struct sockaddr *)&state->ss,
898 state->salen);
899 if ((subreq == NULL)
900 || !tevent_req_set_endtime(
901 subreq, state->ev,
902 timeval_current_ofs(0, state->wait_nsec))) {
903 goto fail;
904 }
905 tevent_req_set_callback(subreq, open_socket_out_connected, result);
906 return result;
907
908 post_status:
909 tevent_req_nterror(result, status);
910 return tevent_req_post(result, ev);
911 fail:
912 TALLOC_FREE(result);
913 return NULL;
914 }
915
916 static void open_socket_out_connected(struct tevent_req *subreq)
917 {
918 struct tevent_req *req =
919 tevent_req_callback_data(subreq, struct tevent_req);
920 struct open_socket_out_state *state =
921 tevent_req_data(req, struct open_socket_out_state);
922 int ret;
923 int sys_errno;
924
925 ret = async_connect_recv(subreq, &sys_errno);
926 TALLOC_FREE(subreq);
927 if (ret == 0) {
928 tevent_req_done(req);
929 return;
930 }
931
932 if (
933 #ifdef ETIMEDOUT
934 (sys_errno == ETIMEDOUT) ||
935 #endif
936 (sys_errno == EINPROGRESS) ||
937 (sys_errno == EALREADY) ||
938 (sys_errno == EAGAIN)) {
939
940 /*
941 * retry
942 */
943
944 if (state->wait_nsec < 250000) {
945 state->wait_nsec *= 1.5;
946 }
947
948 subreq = async_connect_send(state, state->ev, state->fd,
949 (struct sockaddr *)&state->ss,
950 state->salen);
951 if (tevent_req_nomem(subreq, req)) {
952 return;
953 }
954 if (!tevent_req_set_endtime(
955 subreq, state->ev,
956 timeval_current_ofs(0, state->wait_nsec))) {
957 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
958 return;
959 }
960 tevent_req_set_callback(subreq, open_socket_out_connected, req);
961 return;
962 }
963
964 #ifdef EISCONN
965 if (sys_errno == EISCONN) {
966 tevent_req_done(req);
967 return;
968 }
969 #endif
970
971 /* real error */
972 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
973 }
974
975 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
976 {
977 struct open_socket_out_state *state =
978 tevent_req_data(req, struct open_socket_out_state);
979 NTSTATUS status;
980
981 if (tevent_req_is_nterror(req, &status)) {
982 return status;
983 }
984 *pfd = state->fd;
985 state->fd = -1;
986 return NT_STATUS_OK;
987 }
988
989 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
990 int timeout, int *pfd)
991 {
992 TALLOC_CTX *frame = talloc_stackframe();
993 struct event_context *ev;
994 struct tevent_req *req;
995 NTSTATUS status = NT_STATUS_NO_MEMORY;
996
997 ev = event_context_init(frame);
998 if (ev == NULL) {
999 goto fail;
1000 }
1001
1002 req = open_socket_out_send(frame, ev, pss, port, timeout);
1003 if (req == NULL) {
1004 goto fail;
1005 }
1006 if (!tevent_req_poll(req, ev)) {
1007 status = NT_STATUS_INTERNAL_ERROR;
1008 goto fail;
1009 }
1010 status = open_socket_out_recv(req, pfd);
1011 fail:
1012 TALLOC_FREE(frame);
1013 return status;
1014 }
1015
1016 struct open_socket_out_defer_state {
1017 struct event_context *ev;
1018 struct sockaddr_storage ss;
1019 uint16_t port;
1020 int timeout;
1021 int fd;
1022 };
1023
1024 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1025 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1026
1027 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1028 struct event_context *ev,
1029 struct timeval wait_time,
1030 const struct sockaddr_storage *pss,
1031 uint16_t port,
1032 int timeout)
1033 {
1034 struct tevent_req *req, *subreq;
1035 struct open_socket_out_defer_state *state;
1036
1037 req = tevent_req_create(mem_ctx, &state,
1038 struct open_socket_out_defer_state);
1039 if (req == NULL) {
1040 return NULL;
1041 }
1042 state->ev = ev;
1043 state->ss = *pss;
1044 state->port = port;
1045 state->timeout = timeout;
1046
1047 subreq = tevent_wakeup_send(
1048 state, ev,
1049 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1050 if (subreq == NULL) {
1051 goto fail;
1052 }
1053 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1054 return req;
1055 fail:
1056 TALLOC_FREE(req);
1057 return NULL;
1058 }
1059
1060 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1061 {
1062 struct tevent_req *req = tevent_req_callback_data(
1063 subreq, struct tevent_req);
1064 struct open_socket_out_defer_state *state = tevent_req_data(
1065 req, struct open_socket_out_defer_state);
1066 bool ret;
1067
1068 ret = tevent_wakeup_recv(subreq);
1069 TALLOC_FREE(subreq);
1070 if (!ret) {
1071 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1072 return;
1073 }
1074
1075 subreq = open_socket_out_send(state, state->ev, &state->ss,
1076 state->port, state->timeout);
1077 if (tevent_req_nomem(subreq, req)) {
1078 return;
1079 }
1080 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1081 }
1082
1083 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1084 {
1085 struct tevent_req *req = tevent_req_callback_data(
1086 subreq, struct tevent_req);
1087 struct open_socket_out_defer_state *state = tevent_req_data(
1088 req, struct open_socket_out_defer_state);
1089 NTSTATUS status;
1090
1091 status = open_socket_out_recv(subreq, &state->fd);
1092 TALLOC_FREE(subreq);
1093 if (!NT_STATUS_IS_OK(status)) {
1094 tevent_req_nterror(req, status);
1095 return;
1096 }
1097 tevent_req_done(req);
1098 }
1099
1100 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1101 {
1102 struct open_socket_out_defer_state *state = tevent_req_data(
1103 req, struct open_socket_out_defer_state);
1104 NTSTATUS status;
1105
1106 if (tevent_req_is_nterror(req, &status)) {
1107 return status;
1108 }
1109 *pfd = state->fd;
1110 state->fd = -1;
1111 return NT_STATUS_OK;
1112 }
1113
1114 /*******************************************************************
1115 Create an outgoing TCP socket to the first addr that connects.
1116
1117 This is for simultaneous connection attempts to port 445 and 139 of a host
1118 or for simultatneous connection attempts to multiple DCs at once. We return
1119 a socket fd of the first successful connection.
1120
1121 @param[in] addrs list of Internet addresses and ports to connect to
1122 @param[in] num_addrs number of address/port pairs in the addrs list
1123 @param[in] timeout time after which we stop waiting for a socket connection
1124 to succeed, given in milliseconds
1125 @param[out] fd_index the entry in addrs which we successfully connected to
1126 @param[out] fd fd of the open and connected socket
1127 @return true on a successful connection, false if all connection attempts
1128 failed or we timed out
1129 *******************************************************************/
1130
1131 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1132 int timeout, int *fd_index, int *fd)
1133 {
1134 int i, resulting_index, res;
1135 int *sockets;
1136 bool good_connect;
1137
1138 fd_set r_fds, wr_fds;
1139 struct timeval tv;
1140 int maxfd;
1141
1142 int connect_loop = 10000; /* 10 milliseconds */
1143
1144 timeout *= 1000; /* convert to microseconds */
1145
1146 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1147
1148 if (sockets == NULL)
1149 return false;
1150
1151 resulting_index = -1;
1152
1153 for (i=0; i<num_addrs; i++)
1154 sockets[i] = -1;
1155
1156 for (i=0; i<num_addrs; i++) {
1157 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1158 if (sockets[i] < 0)
1159 goto done;
1160 set_blocking(sockets[i], false);
1161 }
1162
1163 connect_again:
1164 good_connect = false;
1165
1166 for (i=0; i<num_addrs; i++) {
1167 const struct sockaddr * a =
1168 (const struct sockaddr *)&(addrs[i]);
1169
1170 if (sockets[i] == -1)
1171 continue;
1172
1173 if (sys_connect(sockets[i], a) == 0) {
1174 /* Rather unlikely as we are non-blocking, but it
1175 * might actually happen. */
1176 resulting_index = i;
1177 goto done;
1178 }
1179
1180 if (errno == EINPROGRESS || errno == EALREADY ||
1181 #ifdef EISCONN
1182 errno == EISCONN ||
1183 #endif
1184 errno == EAGAIN || errno == EINTR) {
1185 /* These are the error messages that something is
1186 progressing. */
1187 good_connect = true;
1188 } else if (errno != 0) {
1189 /* There was a direct error */
1190 close(sockets[i]);
1191 sockets[i] = -1;
1192 }
1193 }
1194
1195 if (!good_connect) {
1196 /* All of the connect's resulted in real error conditions */
1197 goto done;
1198 }
1199
1200 /* Lets see if any of the connect attempts succeeded */
1201
1202 maxfd = 0;
1203 FD_ZERO(&wr_fds);
1204 FD_ZERO(&r_fds);
1205
1206 for (i=0; i<num_addrs; i++) {
1207 if (sockets[i] == -1)
1208 continue;
1209 FD_SET(sockets[i], &wr_fds);
1210 FD_SET(sockets[i], &r_fds);
1211 if (sockets[i]>maxfd)
1212 maxfd = sockets[i];
1213 }
1214
1215 tv.tv_sec = 0;
1216 tv.tv_usec = connect_loop;
1217
1218 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1219
1220 if (res < 0)
1221 goto done;
1222
1223 if (res == 0)
1224 goto next_round;
1225
1226 for (i=0; i<num_addrs; i++) {
1227
1228 if (sockets[i] == -1)
1229 continue;
1230
1231 /* Stevens, Network Programming says that if there's a
1232 * successful connect, the socket is only writable. Upon an
1233 * error, it's both readable and writable. */
1234
1235 if (FD_ISSET(sockets[i], &r_fds) &&
1236 FD_ISSET(sockets[i], &wr_fds)) {
1237 /* readable and writable, so it's an error */
1238 close(sockets[i]);
1239 sockets[i] = -1;
1240 continue;
1241 }
1242
1243 if (!FD_ISSET(sockets[i], &r_fds) &&
1244 FD_ISSET(sockets[i], &wr_fds)) {
1245 /* Only writable, so it's connected */
1246 resulting_index = i;
1247 goto done;
1248 }
1249 }
1250
1251 next_round:
1252
1253 timeout -= connect_loop;
1254 if (timeout <= 0)
1255 goto done;
1256 connect_loop *= 1.5;
1257 if (connect_loop > timeout)
1258 connect_loop = timeout;
1259 goto connect_again;
1260
1261 done:
1262 for (i=0; i<num_addrs; i++) {
1263 if (i == resulting_index)
1264 continue;
1265 if (sockets[i] >= 0)
1266 close(sockets[i]);
1267 }
1268
1269 if (resulting_index >= 0) {
1270 *fd_index = resulting_index;
1271 *fd = sockets[*fd_index];
1272 set_blocking(*fd, true);
1273 }
1274
1275 free(sockets);
1276
1277 return (resulting_index >= 0);
1278 }
1279 /****************************************************************************
1280 Open a connected UDP socket to host on port
1281 **************************************************************************/
1282
1283 int open_udp_socket(const char *host, int port)
1284 {
1285 struct sockaddr_storage ss;
1286 int res;
1287
1288 if (!interpret_string_addr(&ss, host, 0)) {
1289 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1290 host));
1291 return -1;
1292 }
1293
1294 res = socket(ss.ss_family, SOCK_DGRAM, 0);
1295 if (res == -1) {
1296 return -1;
1297 }
1298
1299 #if defined(HAVE_IPV6)
1300 if (ss.ss_family == AF_INET6) {
1301 struct sockaddr_in6 *psa6;
1302 psa6 = (struct sockaddr_in6 *)&ss;
1303 psa6->sin6_port = htons(port);
1304 if (psa6->sin6_scope_id == 0
1305 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1306 setup_linklocal_scope_id(
1307 (struct sockaddr *)&ss);
1308 }
1309 }
1310 #endif
1311 if (ss.ss_family == AF_INET) {
1312 struct sockaddr_in *psa;
1313 psa = (struct sockaddr_in *)&ss;
1314 psa->sin_port = htons(port);
1315 }
1316
1317 if (sys_connect(res,(struct sockaddr *)&ss)) {
1318 close(res);
1319 return -1;
1320 }
1321
1322 return res;
1323 }
1324
1325 /*******************************************************************
1326 Return the IP addr of the remote end of a socket as a string.
1327 Optionally return the struct sockaddr_storage.
1328 ******************************************************************/
1329
1330 static const char *get_peer_addr_internal(int fd,
1331 char *addr_buf,
1332 size_t addr_buf_len,
1333 struct sockaddr *pss,
1334 socklen_t *plength)
1335 {
1336 struct sockaddr_storage ss;
1337 socklen_t length = sizeof(ss);
1338
1339 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1340
1341 if (fd == -1) {
1342 return addr_buf;
1343 }
1344
1345 if (pss == NULL) {
1346 pss = (struct sockaddr *)&ss;
1347 plength = &length;
1348 }
1349
1350 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1351 int level = (errno == ENOTCONN) ? 2 : 0;
1352 DEBUG(level, ("getpeername failed. Error was %s\n",
1353 strerror(errno)));
1354 return addr_buf;
1355 }
1356
1357 print_sockaddr_len(addr_buf,
1358 addr_buf_len,
1359 pss,
1360 *plength);
1361 return addr_buf;
1362 }
1363
1364 /*******************************************************************
1365 Matchname - determine if host name matches IP address. Used to
1366 confirm a hostname lookup to prevent spoof attacks.
1367 ******************************************************************/
1368
1369 static bool matchname(const char *remotehost,
1370 const struct sockaddr *pss,
1371 socklen_t len)
1372 {
1373 struct addrinfo *res = NULL;
1374 struct addrinfo *ailist = NULL;
1375 char addr_buf[INET6_ADDRSTRLEN];
1376 bool ret = interpret_string_addr_internal(&ailist,
1377 remotehost,
1378 AI_ADDRCONFIG|AI_CANONNAME);
1379
1380 if (!ret || ailist == NULL) {
1381 DEBUG(3,("matchname: getaddrinfo failed for "
1382 "name %s [%s]\n",
1383 remotehost,
1384 gai_strerror(ret) ));
1385 return false;
1386 }
1387
1388 /*
1389 * Make sure that getaddrinfo() returns the "correct" host name.
1390 */
1391
1392 if (ailist->ai_canonname == NULL ||
1393 (!strequal(remotehost, ailist->ai_canonname) &&
1394 !strequal(remotehost, "localhost"))) {
1395 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1396 remotehost,
1397 ailist->ai_canonname ?
1398 ailist->ai_canonname : "(NULL)"));
1399 freeaddrinfo(ailist);
1400 return false;
1401 }
1402
1403 /* Look up the host address in the address list we just got. */
1404 for (res = ailist; res; res = res->ai_next) {
1405 if (!res->ai_addr) {
1406 continue;
1407 }
1408 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1409 (struct sockaddr *)pss)) {
1410 freeaddrinfo(ailist);
1411 return true;
1412 }
1413 }
1414
1415 /*
1416 * The host name does not map to the original host address. Perhaps
1417 * someone has compromised a name server. More likely someone botched
1418 * it, but that could be dangerous, too.
1419 */
1420
1421 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1422 print_sockaddr_len(addr_buf,
1423 sizeof(addr_buf),
1424 pss,
1425 len),
1426 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1427
1428 if (ailist) {
1429 freeaddrinfo(ailist);
1430 }
1431 return false;
1432 }
1433
1434 /*******************************************************************
1435 Deal with the singleton cache.
1436 ******************************************************************/
1437
1438 struct name_addr_pair {
1439 struct sockaddr_storage ss;
1440 const char *name;
1441 };
1442
1443 /*******************************************************************
1444 Lookup a name/addr pair. Returns memory allocated from memcache.
1445 ******************************************************************/
1446
1447 static bool lookup_nc(struct name_addr_pair *nc)
1448 {
1449 DATA_BLOB tmp;
1450
1451 ZERO_STRUCTP(nc);
1452
1453 if (!memcache_lookup(
1454 NULL, SINGLETON_CACHE,
1455 data_blob_string_const_null("get_peer_name"),
1456 &tmp)) {
1457 return false;
1458 }
1459
1460 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1461 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1462 return true;
1463 }
1464
1465 /*******************************************************************
1466 Save a name/addr pair.
1467 ******************************************************************/
1468
1469 static void store_nc(const struct name_addr_pair *nc)
1470 {
1471 DATA_BLOB tmp;
1472 size_t namelen = strlen(nc->name);
1473
1474 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1475 if (!tmp.data) {
1476 return;
1477 }
1478 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1479 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1480
1481 memcache_add(NULL, SINGLETON_CACHE,
1482 data_blob_string_const_null("get_peer_name"),
1483 tmp);
1484 data_blob_free(&tmp);
1485 }
1486
1487 /*******************************************************************
1488 Return the DNS name of the remote end of a socket.
1489 ******************************************************************/
1490
1491 const char *get_peer_name(int fd, bool force_lookup)
1492 {
1493 struct name_addr_pair nc;
1494 char addr_buf[INET6_ADDRSTRLEN];
1495 struct sockaddr_storage ss;
1496 socklen_t length = sizeof(ss);
1497 const char *p;
1498 int ret;
1499 char name_buf[MAX_DNS_NAME_LENGTH];
1500 char tmp_name[MAX_DNS_NAME_LENGTH];
1501
1502 /* reverse lookups can be *very* expensive, and in many
1503 situations won't work because many networks don't link dhcp
1504 with dns. To avoid the delay we avoid the lookup if
1505 possible */
1506 if (!lp_hostname_lookups() && (force_lookup == false)) {
1507 length = sizeof(nc.ss);
1508 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1509 (struct sockaddr *)&nc.ss, &length);
1510 store_nc(&nc);
1511 lookup_nc(&nc);
1512 return nc.name ? nc.name : "UNKNOWN";
1513 }
1514
1515 lookup_nc(&nc);
1516
1517 memset(&ss, '\0', sizeof(ss));
1518 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1519
1520 /* it might be the same as the last one - save some DNS work */
1521 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1522 return nc.name ? nc.name : "UNKNOWN";
1523 }
1524
1525 /* Not the same. We need to lookup. */
1526 if (fd == -1) {
1527 return "UNKNOWN";
1528 }
1529
1530 /* Look up the remote host name. */
1531 ret = sys_getnameinfo((struct sockaddr *)&ss,
1532 length,
1533 name_buf,
1534 sizeof(name_buf),
1535 NULL,
1536 0,
1537 0);
1538
1539 if (ret) {
1540 DEBUG(1,("get_peer_name: getnameinfo failed "
1541 "for %s with error %s\n",
1542 p,
1543 gai_strerror(ret)));
1544 strlcpy(name_buf, p, sizeof(name_buf));
1545 } else {
1546 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1547 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1548 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1549 }
1550 }
1551
1552 /* can't pass the same source and dest strings in when you
1553 use --enable-developer or the clobber_region() call will
1554 get you */
1555
1556 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1557 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1558 if (strstr(name_buf,"..")) {
1559 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1560 }
1561
1562 nc.name = name_buf;
1563 nc.ss = ss;
1564
1565 store_nc(&nc);
1566 lookup_nc(&nc);
1567 return nc.name ? nc.name : "UNKNOWN";
1568 }
1569
1570 /*******************************************************************
1571 Return the IP addr of the remote end of a socket as a string.
1572 ******************************************************************/
1573
1574 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1575 {
1576 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1577 }
1578
1579 /*******************************************************************
1580 Create protected unix domain socket.
1581
1582 Some unixes cannot set permissions on a ux-dom-sock, so we
1583 have to make sure that the directory contains the protection
1584 permissions instead.
1585 ******************************************************************/
1586
1587 int create_pipe_sock(const char *socket_dir,
1588 const char *socket_name,
1589 mode_t dir_perms)
1590 {
1591 #ifdef HAVE_UNIXSOCKET
1592 struct sockaddr_un sunaddr;
1593 struct stat st;
1594 int sock;
1595 mode_t old_umask;
1596 char *path = NULL;
1597
1598 old_umask = umask(0);
1599
1600 /* Create the socket directory or reuse the existing one */
1601
1602 if (lstat(socket_dir, &st) == -1) {
1603 if (errno == ENOENT) {
1604 /* Create directory */
1605 if (mkdir(socket_dir, dir_perms) == -1) {
1606 DEBUG(0, ("error creating socket directory "
1607 "%s: %s\n", socket_dir,
1608 strerror(errno)));
1609 goto out_umask;
1610 }
1611 } else {
1612 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1613 socket_dir, strerror(errno)));
1614 goto out_umask;
1615 }
1616 } else {
1617 /* Check ownership and permission on existing directory */
1618 if (!S_ISDIR(st.st_mode)) {
1619 DEBUG(0, ("socket directory %s isn't a directory\n",
1620 socket_dir));
1621 goto out_umask;
1622 }
1623 if ((st.st_uid != sec_initial_uid()) ||
1624 ((st.st_mode & 0777) != dir_perms)) {
1625 DEBUG(0, ("invalid permissions on socket directory "
1626 "%s\n", socket_dir));
1627 goto out_umask;
1628 }
1629 }
1630
1631 /* Create the socket file */
1632
1633 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1634
1635 if (sock == -1) {
1636 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1637 strerror(errno) ));
1638 goto out_close;
1639 }
1640
1641 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1642 goto out_close;
1643 }
1644
1645 unlink(path);
1646 memset(&sunaddr, 0, sizeof(sunaddr));
1647 sunaddr.sun_family = AF_UNIX;
1648 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1649
1650 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1651 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1652 strerror(errno)));
1653 goto out_close;
1654 }
1655
1656 if (listen(sock, 5) == -1) {
1657 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1658 strerror(errno)));
1659 goto out_close;
1660 }
1661
1662 SAFE_FREE(path);
1663
1664 umask(old_umask);
1665 return sock;
1666
1667 out_close:
1668 SAFE_FREE(path);
1669 if (sock != -1)
1670 close(sock);
1671
1672 out_umask:
1673 umask(old_umask);
1674 return -1;
1675
1676 #else
1677 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1678 return -1;
1679 #endif /* HAVE_UNIXSOCKET */
1680 }
1681
1682 /****************************************************************************
1683 Get my own canonical name, including domain.
1684 ****************************************************************************/
1685
1686 const char *get_mydnsfullname(void)
1687 {
1688 struct addrinfo *res = NULL;
1689 char my_hostname[HOST_NAME_MAX];
1690 bool ret;
1691 DATA_BLOB tmp;
1692
1693 if (memcache_lookup(NULL, SINGLETON_CACHE,
1694 data_blob_string_const_null("get_mydnsfullname"),
1695 &tmp)) {
1696 SMB_ASSERT(tmp.length > 0);
1697 return (const char *)tmp.data;
1698 }
1699
1700 /* get my host name */
1701 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1702 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1703 return NULL;
1704 }
1705
1706 /* Ensure null termination. */
1707 my_hostname[sizeof(my_hostname)-1] = '\0';
1708
1709 ret = interpret_string_addr_internal(&res,
1710 my_hostname,
1711 AI_ADDRCONFIG|AI_CANONNAME);
1712
1713 if (!ret || res == NULL) {
1714 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1715 "name %s [%s]\n",
1716 my_hostname,
1717 gai_strerror(ret) ));
1718 return NULL;
1719 }
1720
1721 /*
1722 * Make sure that getaddrinfo() returns the "correct" host name.
1723 */
1724
1725 if (res->ai_canonname == NULL) {
1726 DEBUG(3,("get_mydnsfullname: failed to get "
1727 "canonical name for %s\n",
1728 my_hostname));
1729 freeaddrinfo(res);
1730 return NULL;
1731 }
1732
1733 /* This copies the data, so we must do a lookup
1734 * afterwards to find the value to return.
1735 */
1736
1737 memcache_add(NULL, SINGLETON_CACHE,
1738 data_blob_string_const_null("get_mydnsfullname"),
1739 data_blob_string_const_null(res->ai_canonname));
1740
1741 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1742 data_blob_string_const_null("get_mydnsfullname"),
1743 &tmp)) {
1744 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1745 strlen(res->ai_canonname) + 1);
1746 }
1747
1748 freeaddrinfo(res);
1749
1750 return (const char *)tmp.data;
1751 }
1752
1753 /************************************************************
1754 Is this my name ?
1755 ************************************************************/
1756
1757 bool is_myname_or_ipaddr(const char *s)
1758 {
1759 TALLOC_CTX *ctx = talloc_tos();
1760 char addr[INET6_ADDRSTRLEN];
1761 char *name = NULL;
1762 const char *dnsname;
1763 char *servername = NULL;
1764
1765 if (!s) {
1766 return false;
1767 }
1768
1769 /* Santize the string from '\\name' */
1770 name = talloc_strdup(ctx, s);
1771 if (!name) {
1772 return false;
1773 }
1774
1775 servername = strrchr_m(name, '\\' );
1776 if (!servername) {
1777 servername = name;
1778 } else {
1779 servername++;
1780 }
1781
1782 /* Optimize for the common case */
1783 if (strequal(servername, global_myname())) {
1784 return true;
1785 }
1786
1787 /* Check for an alias */
1788 if (is_myname(servername)) {
1789 return true;
1790 }
1791
1792 /* Check for loopback */
1793 if (strequal(servername, "127.0.0.1") ||
1794 strequal(servername, "::1")) {
1795 return true;
1796 }
1797
1798 if (strequal(servername, "localhost")) {
1799 return true;
1800 }
1801
1802 /* Maybe it's my dns name */
1803 dnsname = get_mydnsfullname();
1804 if (dnsname && strequal(servername, dnsname)) {
1805 return true;
1806 }
1807
1808 /* Handle possible CNAME records - convert to an IP addr. */
1809 if (!is_ipaddress(servername)) {
1810 /* Use DNS to resolve the name, but only the first address */
1811 struct sockaddr_storage ss;
1812 if (interpret_string_addr(&ss, servername, 0)) {
1813 print_sockaddr(addr,
1814 sizeof(addr),
1815 &ss);
1816 servername = addr;
1817 }
1818 }
1819
1820 /* Maybe its an IP address? */
1821 if (is_ipaddress(servername)) {
1822 struct sockaddr_storage ss;
1823 struct iface_struct *nics;
1824 int i, n;
1825
1826 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1827 return false;
1828 }
1829
1830 if (ismyaddr((struct sockaddr *)&ss)) {
1831 return true;
1832 }
1833
1834 if (is_zero_addr((struct sockaddr *)&ss) ||
1835 is_loopback_addr((struct sockaddr *)&ss)) {
1836 return false;
1837 }
1838
1839 n = get_interfaces(talloc_tos(), &nics);
1840 for (i=0; i<n; i++) {
1841 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1842 TALLOC_FREE(nics);
1843 return true;
1844 }
1845 }
1846 TALLOC_FREE(nics);
1847 }
1848
1849 /* No match */
1850 return false;
1851 }
1852
1853 struct getaddrinfo_state {
1854 const char *node;
1855 const char *service;
1856 const struct addrinfo *hints;
1857 struct addrinfo *res;
1858 int ret;
1859 };
1860
1861 static void getaddrinfo_do(void *private_data);
1862 static void getaddrinfo_done(struct tevent_req *subreq);
1863
1864 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1865 struct tevent_context *ev,
1866 struct fncall_context *ctx,
1867 const char *node,
1868 const char *service,
1869 const struct addrinfo *hints)
1870 {
1871 struct tevent_req *req, *subreq;
1872 struct getaddrinfo_state *state;
1873
1874 req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1875 if (req == NULL) {
1876 return NULL;
1877 }
1878
1879 state->node = node;
1880 state->service = service;
1881 state->hints = hints;
1882
1883 subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1884 if (tevent_req_nomem(subreq, req)) {
1885 return tevent_req_post(req, ev);
1886 }
1887 tevent_req_set_callback(subreq, getaddrinfo_done, req);
1888 return req;
1889 }
1890
1891 static void getaddrinfo_do(void *private_data)
1892 {
1893 struct getaddrinfo_state *state =
1894 (struct getaddrinfo_state *)private_data;
1895
1896 state->ret = getaddrinfo(state->node, state->service, state->hints,
1897 &state->res);
1898 }
1899
1900 static void getaddrinfo_done(struct tevent_req *subreq)
1901 {
1902 struct tevent_req *req = tevent_req_callback_data(
1903 subreq, struct tevent_req);
1904 int ret, err;
1905
1906 ret = fncall_recv(subreq, &err);
1907 TALLOC_FREE(subreq);
1908 if (ret == -1) {
1909 tevent_req_error(req, err);
1910 return;
1911 }
1912 tevent_req_done(req);
1913 }
1914
1915 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1916 {
1917 struct getaddrinfo_state *state = tevent_req_data(
1918 req, struct getaddrinfo_state);
1919 int err;
1920
1921 if (tevent_req_is_unix_error(req, &err)) {
1922 switch(err) {
1923 case ENOMEM:
1924 return EAI_MEMORY;
1925 default:
1926 return EAI_FAIL;
1927 }
1928 }
1929 if (state->ret == 0) {
1930 *res = state->res;
1931 }
1932 return state->ret;
1933 }
reg import