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s3: Fix an uninitialized variable
[Samba/ita.git] / source3 / lib / util_sock.c
blobe9626f31fe1652c0d117b5a6327aebcf3d4da47a
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
24 /****************************************************************************
25 Get a port number in host byte order from a sockaddr_storage.
26 ****************************************************************************/
27
28 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
29 {
30 uint16_t port = 0;
31
32 if (pss->ss_family != AF_INET) {
33 #if defined(HAVE_IPV6)
34 /* IPv6 */
35 const struct sockaddr_in6 *sa6 =
36 (const struct sockaddr_in6 *)pss;
37 port = ntohs(sa6->sin6_port);
38 #endif
39 } else {
40 const struct sockaddr_in *sa =
41 (const struct sockaddr_in *)pss;
42 port = ntohs(sa->sin_port);
43 }
44 return port;
45 }
46
47 /****************************************************************************
48 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
49 ****************************************************************************/
50
51 static char *print_sockaddr_len(char *dest,
52 size_t destlen,
53 const struct sockaddr *psa,
54 socklen_t psalen)
55 {
56 if (destlen > 0) {
57 dest[0] = '\0';
58 }
59 (void)sys_getnameinfo(psa,
60 psalen,
61 dest, destlen,
62 NULL, 0,
63 NI_NUMERICHOST);
64 return dest;
65 }
66
67 /****************************************************************************
68 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
69 ****************************************************************************/
70
71 char *print_sockaddr(char *dest,
72 size_t destlen,
73 const struct sockaddr_storage *psa)
74 {
75 return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
76 sizeof(struct sockaddr_storage));
77 }
78
79 /****************************************************************************
80 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
81 ****************************************************************************/
82
83 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
84 const struct sockaddr_storage *pss)
85 {
86 char addr[INET6_ADDRSTRLEN];
87 char *dest = NULL;
88 int ret;
89
90 /* Linux getnameinfo() man pages says port is unitialized if
91 service name is NULL. */
92
93 ret = sys_getnameinfo((const struct sockaddr *)pss,
94 sizeof(struct sockaddr_storage),
95 addr, sizeof(addr),
96 NULL, 0,
97 NI_NUMERICHOST);
98 if (ret != 0) {
99 return NULL;
100 }
101
102 if (pss->ss_family != AF_INET) {
103 #if defined(HAVE_IPV6)
104 dest = talloc_asprintf(ctx, "[%s]", addr);
105 #else
106 return NULL;
107 #endif
108 } else {
109 dest = talloc_asprintf(ctx, "%s", addr);
110 }
111
112 return dest;
113 }
114
115 /****************************************************************************
116 Return the string of an IP address (IPv4 or IPv6).
117 ****************************************************************************/
118
119 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
120 {
121 struct sockaddr_storage sa;
122 socklen_t length = sizeof(sa);
123
124 /* Ok, returning a hard coded IPv4 address
125 * is bogus, but it's just as bogus as a
126 * zero IPv6 address. No good choice here.
127 */
128
129 strlcpy(addr_buf, "0.0.0.0", addr_len);
130
131 if (fd == -1) {
132 return addr_buf;
133 }
134
135 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
136 DEBUG(0,("getsockname failed. Error was %s\n",
137 strerror(errno) ));
138 return addr_buf;
139 }
140
141 return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
142 }
143
144 /****************************************************************************
145 Return the port number we've bound to on a socket.
146 ****************************************************************************/
147
148 int get_socket_port(int fd)
149 {
150 struct sockaddr_storage sa;
151 socklen_t length = sizeof(sa);
152
153 if (fd == -1) {
154 return -1;
155 }
156
157 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
158 int level = (errno == ENOTCONN) ? 2 : 0;
159 DEBUG(level, ("getpeername failed. Error was %s\n",
160 strerror(errno)));
161 return -1;
162 }
163
164 #if defined(HAVE_IPV6)
165 if (sa.ss_family == AF_INET6) {
166 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
167 }
168 #endif
169 if (sa.ss_family == AF_INET) {
170 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
171 }
172 return -1;
173 }
174
175 const char *client_name(int fd)
176 {
177 return get_peer_name(fd,false);
178 }
179
180 const char *client_addr(int fd, char *addr, size_t addrlen)
181 {
182 return get_peer_addr(fd,addr,addrlen);
183 }
184
185 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
186 {
187 return get_socket_addr(fd, addr, addr_len);
188 }
189
190 #if 0
191 /* Not currently used. JRA. */
192 int client_socket_port(int fd)
193 {
194 return get_socket_port(fd);
195 }
196 #endif
197
198 /****************************************************************************
199 Accessor functions to make thread-safe code easier later...
200 ****************************************************************************/
201
202 void set_smb_read_error(enum smb_read_errors *pre,
203 enum smb_read_errors newerr)
204 {
205 if (pre) {
206 *pre = newerr;
207 }
208 }
209
210 void cond_set_smb_read_error(enum smb_read_errors *pre,
211 enum smb_read_errors newerr)
212 {
213 if (pre && *pre == SMB_READ_OK) {
214 *pre = newerr;
215 }
216 }
217
218 /****************************************************************************
219 Determine if a file descriptor is in fact a socket.
220 ****************************************************************************/
221
222 bool is_a_socket(int fd)
223 {
224 int v;
225 socklen_t l;
226 l = sizeof(int);
227 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
228 }
229
230 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
231
232 typedef struct smb_socket_option {
233 const char *name;
234 int level;
235 int option;
236 int value;
237 int opttype;
238 } smb_socket_option;
239
240 static const smb_socket_option socket_options[] = {
241 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
242 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
243 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
244 #ifdef TCP_NODELAY
245 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
246 #endif
247 #ifdef TCP_KEEPCNT
248 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
249 #endif
250 #ifdef TCP_KEEPIDLE
251 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
252 #endif
253 #ifdef TCP_KEEPINTVL
254 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
255 #endif
256 #ifdef IPTOS_LOWDELAY
257 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
258 #endif
259 #ifdef IPTOS_THROUGHPUT
260 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
261 #endif
262 #ifdef SO_REUSEPORT
263 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
264 #endif
265 #ifdef SO_SNDBUF
266 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
267 #endif
268 #ifdef SO_RCVBUF
269 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
270 #endif
271 #ifdef SO_SNDLOWAT
272 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
273 #endif
274 #ifdef SO_RCVLOWAT
275 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
276 #endif
277 #ifdef SO_SNDTIMEO
278 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
279 #endif
280 #ifdef SO_RCVTIMEO
281 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
282 #endif
283 #ifdef TCP_FASTACK
284 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
285 #endif
286 #ifdef TCP_QUICKACK
287 {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL},
288 #endif
289 {NULL,0,0,0,0}};
290
291 /****************************************************************************
292 Print socket options.
293 ****************************************************************************/
294
295 static void print_socket_options(int s)
296 {
297 int value;
298 socklen_t vlen = 4;
299 const smb_socket_option *p = &socket_options[0];
300
301 /* wrapped in if statement to prevent streams
302 * leak in SCO Openserver 5.0 */
303 /* reported on samba-technical --jerry */
304 if ( DEBUGLEVEL >= 5 ) {
305 DEBUG(5,("Socket options:\n"));
306 for (; p->name != NULL; p++) {
307 if (getsockopt(s, p->level, p->option,
308 (void *)&value, &vlen) == -1) {
309 DEBUGADD(5,("\tCould not test socket option %s.\n",
310 p->name));
311 } else {
312 DEBUGADD(5,("\t%s = %d\n",
313 p->name,value));
314 }
315 }
316 }
317 }
318
319 /****************************************************************************
320 Set user socket options.
321 ****************************************************************************/
322
323 void set_socket_options(int fd, const char *options)
324 {
325 TALLOC_CTX *ctx = talloc_stackframe();
326 char *tok;
327
328 while (next_token_talloc(ctx, &options, &tok," \t,")) {
329 int ret=0,i;
330 int value = 1;
331 char *p;
332 bool got_value = false;
333
334 if ((p = strchr_m(tok,'='))) {
335 *p = 0;
336 value = atoi(p+1);
337 got_value = true;
338 }
339
340 for (i=0;socket_options[i].name;i++)
341 if (strequal(socket_options[i].name,tok))
342 break;
343
344 if (!socket_options[i].name) {
345 DEBUG(0,("Unknown socket option %s\n",tok));
346 continue;
347 }
348
349 switch (socket_options[i].opttype) {
350 case OPT_BOOL:
351 case OPT_INT:
352 ret = setsockopt(fd,socket_options[i].level,
353 socket_options[i].option,
354 (char *)&value,sizeof(int));
355 break;
356
357 case OPT_ON:
358 if (got_value)
359 DEBUG(0,("syntax error - %s "
360 "does not take a value\n",tok));
361
362 {
363 int on = socket_options[i].value;
364 ret = setsockopt(fd,socket_options[i].level,
365 socket_options[i].option,
366 (char *)&on,sizeof(int));
367 }
368 break;
369 }
370
371 if (ret != 0) {
372 /* be aware that some systems like Solaris return
373 * EINVAL to a setsockopt() call when the client
374 * sent a RST previously - no need to worry */
375 DEBUG(2,("Failed to set socket option %s (Error %s)\n",
376 tok, strerror(errno) ));
377 }
378 }
379
380 TALLOC_FREE(ctx);
381 print_socket_options(fd);
382 }
383
384 /****************************************************************************
385 Read from a socket.
386 ****************************************************************************/
387
388 ssize_t read_udp_v4_socket(int fd,
389 char *buf,
390 size_t len,
391 struct sockaddr_storage *psa)
392 {
393 ssize_t ret;
394 socklen_t socklen = sizeof(*psa);
395 struct sockaddr_in *si = (struct sockaddr_in *)psa;
396
397 memset((char *)psa,'\0',socklen);
398
399 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
400 (struct sockaddr *)psa,&socklen);
401 if (ret <= 0) {
402 /* Don't print a low debug error for a non-blocking socket. */
403 if (errno == EAGAIN) {
404 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
405 } else {
406 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
407 strerror(errno)));
408 }
409 return 0;
410 }
411
412 if (psa->ss_family != AF_INET) {
413 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
414 "(not IPv4)\n", (int)psa->ss_family));
415 return 0;
416 }
417
418 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
419 inet_ntoa(si->sin_addr),
420 si->sin_port,
421 (unsigned long)ret));
422
423 return ret;
424 }
425
426 /****************************************************************************
427 Read data from a file descriptor with a timout in msec.
428 mincount = if timeout, minimum to read before returning
429 maxcount = number to be read.
430 time_out = timeout in milliseconds
431 NB. This can be called with a non-socket fd, don't change
432 sys_read() to sys_recv() or other socket call.
433 ****************************************************************************/
434
435 NTSTATUS read_fd_with_timeout(int fd, char *buf,
436 size_t mincnt, size_t maxcnt,
437 unsigned int time_out,
438 size_t *size_ret)
439 {
440 fd_set fds;
441 int selrtn;
442 ssize_t readret;
443 size_t nread = 0;
444 struct timeval timeout;
445
446 /* just checking .... */
447 if (maxcnt <= 0)
448 return NT_STATUS_OK;
449
450 /* Blocking read */
451 if (time_out == 0) {
452 if (mincnt == 0) {
453 mincnt = maxcnt;
454 }
455
456 while (nread < mincnt) {
457 readret = sys_read(fd, buf + nread, maxcnt - nread);
458
459 if (readret == 0) {
460 DEBUG(5,("read_fd_with_timeout: "
461 "blocking read. EOF from client.\n"));
462 return NT_STATUS_END_OF_FILE;
463 }
464
465 if (readret == -1) {
466 return map_nt_error_from_unix(errno);
467 }
468 nread += readret;
469 }
470 goto done;
471 }
472
473 /* Most difficult - timeout read */
474 /* If this is ever called on a disk file and
475 mincnt is greater then the filesize then
476 system performance will suffer severely as
477 select always returns true on disk files */
478
479 /* Set initial timeout */
480 timeout.tv_sec = (time_t)(time_out / 1000);
481 timeout.tv_usec = (long)(1000 * (time_out % 1000));
482
483 for (nread=0; nread < mincnt; ) {
484 FD_ZERO(&fds);
485 FD_SET(fd,&fds);
486
487 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
488
489 /* Check if error */
490 if (selrtn == -1) {
491 return map_nt_error_from_unix(errno);
492 }
493
494 /* Did we timeout ? */
495 if (selrtn == 0) {
496 DEBUG(10,("read_fd_with_timeout: timeout read. "
497 "select timed out.\n"));
498 return NT_STATUS_IO_TIMEOUT;
499 }
500
501 readret = sys_read(fd, buf+nread, maxcnt-nread);
502
503 if (readret == 0) {
504 /* we got EOF on the file descriptor */
505 DEBUG(5,("read_fd_with_timeout: timeout read. "
506 "EOF from client.\n"));
507 return NT_STATUS_END_OF_FILE;
508 }
509
510 if (readret == -1) {
511 return map_nt_error_from_unix(errno);
512 }
513
514 nread += readret;
515 }
516
517 done:
518 /* Return the number we got */
519 if (size_ret) {
520 *size_ret = nread;
521 }
522 return NT_STATUS_OK;
523 }
524
525 /****************************************************************************
526 Read data from an fd, reading exactly N bytes.
527 NB. This can be called with a non-socket fd, don't add dependencies
528 on socket calls.
529 ****************************************************************************/
530
531 NTSTATUS read_data(int fd, char *buffer, size_t N)
532 {
533 return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
534 }
535
536 /****************************************************************************
537 Write all data from an iov array
538 NB. This can be called with a non-socket fd, don't add dependencies
539 on socket calls.
540 ****************************************************************************/
541
542 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
543 {
544 int i;
545 size_t to_send;
546 ssize_t thistime;
547 size_t sent;
548 struct iovec *iov_copy, *iov;
549
550 to_send = 0;
551 for (i=0; i<iovcnt; i++) {
552 to_send += orig_iov[i].iov_len;
553 }
554
555 thistime = sys_writev(fd, orig_iov, iovcnt);
556 if ((thistime <= 0) || (thistime == to_send)) {
557 return thistime;
558 }
559 sent = thistime;
560
561 /*
562 * We could not send everything in one call. Make a copy of iov that
563 * we can mess with. We keep a copy of the array start in iov_copy for
564 * the TALLOC_FREE, because we're going to modify iov later on,
565 * discarding elements.
566 */
567
568 iov_copy = (struct iovec *)TALLOC_MEMDUP(
569 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
570
571 if (iov_copy == NULL) {
572 errno = ENOMEM;
573 return -1;
574 }
575 iov = iov_copy;
576
577 while (sent < to_send) {
578 /*
579 * We have to discard "thistime" bytes from the beginning
580 * iov array, "thistime" contains the number of bytes sent
581 * via writev last.
582 */
583 while (thistime > 0) {
584 if (thistime < iov[0].iov_len) {
585 char *new_base =
586 (char *)iov[0].iov_base + thistime;
587 iov[0].iov_base = (void *)new_base;
588 iov[0].iov_len -= thistime;
589 break;
590 }
591 thistime -= iov[0].iov_len;
592 iov += 1;
593 iovcnt -= 1;
594 }
595
596 thistime = sys_writev(fd, iov, iovcnt);
597 if (thistime <= 0) {
598 break;
599 }
600 sent += thistime;
601 }
602
603 TALLOC_FREE(iov_copy);
604 return sent;
605 }
606
607 /****************************************************************************
608 Write data to a fd.
609 NB. This can be called with a non-socket fd, don't add dependencies
610 on socket calls.
611 ****************************************************************************/
612
613 ssize_t write_data(int fd, const char *buffer, size_t N)
614 {
615 struct iovec iov;
616
617 iov.iov_base = CONST_DISCARD(void *, buffer);
618 iov.iov_len = N;
619 return write_data_iov(fd, &iov, 1);
620 }
621
622 /****************************************************************************
623 Send a keepalive packet (rfc1002).
624 ****************************************************************************/
625
626 bool send_keepalive(int client)
627 {
628 unsigned char buf[4];
629
630 buf[0] = SMBkeepalive;
631 buf[1] = buf[2] = buf[3] = 0;
632
633 return(write_data(client,(char *)buf,4) == 4);
634 }
635
636 /****************************************************************************
637 Read 4 bytes of a smb packet and return the smb length of the packet.
638 Store the result in the buffer.
639 This version of the function will return a length of zero on receiving
640 a keepalive packet.
641 Timeout is in milliseconds.
642 ****************************************************************************/
643
644 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
645 unsigned int timeout,
646 size_t *len)
647 {
648 int msg_type;
649 NTSTATUS status;
650
651 status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
652
653 if (!NT_STATUS_IS_OK(status)) {
654 return status;
655 }
656
657 *len = smb_len(inbuf);
658 msg_type = CVAL(inbuf,0);
659
660 if (msg_type == SMBkeepalive) {
661 DEBUG(5,("Got keepalive packet\n"));
662 }
663
664 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
665
666 return NT_STATUS_OK;
667 }
668
669 /****************************************************************************
670 Read an smb from a fd.
671 The timeout is in milliseconds.
672 This function will return on receipt of a session keepalive packet.
673 maxlen is the max number of bytes to return, not including the 4 byte
674 length. If zero it means buflen limit.
675 Doesn't check the MAC on signed packets.
676 ****************************************************************************/
677
678 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
679 size_t maxlen, size_t *p_len)
680 {
681 size_t len;
682 NTSTATUS status;
683
684 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
685
686 if (!NT_STATUS_IS_OK(status)) {
687 DEBUG(0, ("read_fd_with_timeout failed, read "
688 "error = %s.\n", nt_errstr(status)));
689 return status;
690 }
691
692 if (len > buflen) {
693 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
694 (unsigned long)len));
695 return NT_STATUS_INVALID_PARAMETER;
696 }
697
698 if(len > 0) {
699 if (maxlen) {
700 len = MIN(len,maxlen);
701 }
702
703 status = read_fd_with_timeout(
704 fd, buffer+4, len, len, timeout, &len);
705
706 if (!NT_STATUS_IS_OK(status)) {
707 DEBUG(0, ("read_fd_with_timeout failed, read error = "
708 "%s.\n", nt_errstr(status)));
709 return status;
710 }
711
712 /* not all of samba3 properly checks for packet-termination
713 * of strings. This ensures that we don't run off into
714 * empty space. */
715 SSVAL(buffer+4,len, 0);
716 }
717
718 *p_len = len;
719 return NT_STATUS_OK;
720 }
721
722 /****************************************************************************
723 Open a socket of the specified type, port, and address for incoming data.
724 ****************************************************************************/
725
726 int open_socket_in(int type,
727 uint16_t port,
728 int dlevel,
729 const struct sockaddr_storage *psock,
730 bool rebind)
731 {
732 struct sockaddr_storage sock;
733 int res;
734 socklen_t slen = sizeof(struct sockaddr_in);
735
736 sock = *psock;
737
738 #if defined(HAVE_IPV6)
739 if (sock.ss_family == AF_INET6) {
740 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
741 slen = sizeof(struct sockaddr_in6);
742 }
743 #endif
744 if (sock.ss_family == AF_INET) {
745 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
746 }
747
748 res = socket(sock.ss_family, type, 0 );
749 if( res == -1 ) {
750 if( DEBUGLVL(0) ) {
751 dbgtext( "open_socket_in(): socket() call failed: " );
752 dbgtext( "%s\n", strerror( errno ) );
753 }
754 return -1;
755 }
756
757 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
758 {
759 int val = rebind ? 1 : 0;
760 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
761 (char *)&val,sizeof(val)) == -1 ) {
762 if( DEBUGLVL( dlevel ) ) {
763 dbgtext( "open_socket_in(): setsockopt: " );
764 dbgtext( "SO_REUSEADDR = %s ",
765 val?"true":"false" );
766 dbgtext( "on port %d failed ", port );
767 dbgtext( "with error = %s\n", strerror(errno) );
768 }
769 }
770 #ifdef SO_REUSEPORT
771 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
772 (char *)&val,sizeof(val)) == -1 ) {
773 if( DEBUGLVL( dlevel ) ) {
774 dbgtext( "open_socket_in(): setsockopt: ");
775 dbgtext( "SO_REUSEPORT = %s ",
776 val?"true":"false");
777 dbgtext( "on port %d failed ", port);
778 dbgtext( "with error = %s\n", strerror(errno));
779 }
780 }
781 #endif /* SO_REUSEPORT */
782 }
783
784 /* now we've got a socket - we need to bind it */
785 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
786 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
787 port == SMB_PORT2 || port == NMB_PORT) ) {
788 char addr[INET6_ADDRSTRLEN];
789 print_sockaddr(addr, sizeof(addr),
790 &sock);
791 dbgtext( "bind failed on port %d ", port);
792 dbgtext( "socket_addr = %s.\n", addr);
793 dbgtext( "Error = %s\n", strerror(errno));
794 }
795 close(res);
796 return -1;
797 }
798
799 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
800 return( res );
801 }
802
803 struct open_socket_out_state {
804 int fd;
805 struct event_context *ev;
806 struct sockaddr_storage ss;
807 socklen_t salen;
808 uint16_t port;
809 int wait_nsec;
810 };
811
812 static void open_socket_out_connected(struct tevent_req *subreq);
813
814 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
815 {
816 if (s->fd != -1) {
817 close(s->fd);
818 }
819 return 0;
820 }
821
822 /****************************************************************************
823 Create an outgoing socket. timeout is in milliseconds.
824 **************************************************************************/
825
826 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
827 struct event_context *ev,
828 const struct sockaddr_storage *pss,
829 uint16_t port,
830 int timeout)
831 {
832 char addr[INET6_ADDRSTRLEN];
833 struct tevent_req *result, *subreq;
834 struct open_socket_out_state *state;
835 NTSTATUS status;
836
837 result = tevent_req_create(mem_ctx, &state,
838 struct open_socket_out_state);
839 if (result == NULL) {
840 return NULL;
841 }
842 state->ev = ev;
843 state->ss = *pss;
844 state->port = port;
845 state->wait_nsec = 10000;
846 state->salen = -1;
847
848 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
849 if (state->fd == -1) {
850 status = map_nt_error_from_unix(errno);
851 goto post_status;
852 }
853 talloc_set_destructor(state, open_socket_out_state_destructor);
854
855 if (!tevent_req_set_endtime(
856 result, ev, timeval_current_ofs(0, timeout*1000))) {
857 goto fail;
858 }
859
860 #if defined(HAVE_IPV6)
861 if (pss->ss_family == AF_INET6) {
862 struct sockaddr_in6 *psa6;
863 psa6 = (struct sockaddr_in6 *)&state->ss;
864 psa6->sin6_port = htons(port);
865 if (psa6->sin6_scope_id == 0
866 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
867 setup_linklocal_scope_id(
868 (struct sockaddr *)&(state->ss));
869 }
870 state->salen = sizeof(struct sockaddr_in6);
871 }
872 #endif
873 if (pss->ss_family == AF_INET) {
874 struct sockaddr_in *psa;
875 psa = (struct sockaddr_in *)&state->ss;
876 psa->sin_port = htons(port);
877 state->salen = sizeof(struct sockaddr_in);
878 }
879
880 if (pss->ss_family == AF_UNIX) {
881 state->salen = sizeof(struct sockaddr_un);
882 }
883
884 print_sockaddr(addr, sizeof(addr), &state->ss);
885 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
886
887 subreq = async_connect_send(state, state->ev, state->fd,
888 (struct sockaddr *)&state->ss,
889 state->salen);
890 if ((subreq == NULL)
891 || !tevent_req_set_endtime(
892 subreq, state->ev,
893 timeval_current_ofs(0, state->wait_nsec))) {
894 goto fail;
895 }
896 tevent_req_set_callback(subreq, open_socket_out_connected, result);
897 return result;
898
899 post_status:
900 tevent_req_nterror(result, status);
901 return tevent_req_post(result, ev);
902 fail:
903 TALLOC_FREE(result);
904 return NULL;
905 }
906
907 static void open_socket_out_connected(struct tevent_req *subreq)
908 {
909 struct tevent_req *req =
910 tevent_req_callback_data(subreq, struct tevent_req);
911 struct open_socket_out_state *state =
912 tevent_req_data(req, struct open_socket_out_state);
913 int ret;
914 int sys_errno;
915
916 ret = async_connect_recv(subreq, &sys_errno);
917 TALLOC_FREE(subreq);
918 if (ret == 0) {
919 tevent_req_done(req);
920 return;
921 }
922
923 if (
924 #ifdef ETIMEDOUT
925 (sys_errno == ETIMEDOUT) ||
926 #endif
927 (sys_errno == EINPROGRESS) ||
928 (sys_errno == EALREADY) ||
929 (sys_errno == EAGAIN)) {
930
931 /*
932 * retry
933 */
934
935 if (state->wait_nsec < 250000) {
936 state->wait_nsec *= 1.5;
937 }
938
939 subreq = async_connect_send(state, state->ev, state->fd,
940 (struct sockaddr *)&state->ss,
941 state->salen);
942 if (tevent_req_nomem(subreq, req)) {
943 return;
944 }
945 if (!tevent_req_set_endtime(
946 subreq, state->ev,
947 timeval_current_ofs(0, state->wait_nsec))) {
948 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
949 return;
950 }
951 tevent_req_set_callback(subreq, open_socket_out_connected, req);
952 return;
953 }
954
955 #ifdef EISCONN
956 if (sys_errno == EISCONN) {
957 tevent_req_done(req);
958 return;
959 }
960 #endif
961
962 /* real error */
963 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
964 }
965
966 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
967 {
968 struct open_socket_out_state *state =
969 tevent_req_data(req, struct open_socket_out_state);
970 NTSTATUS status;
971
972 if (tevent_req_is_nterror(req, &status)) {
973 return status;
974 }
975 *pfd = state->fd;
976 state->fd = -1;
977 return NT_STATUS_OK;
978 }
979
980 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
981 int timeout, int *pfd)
982 {
983 TALLOC_CTX *frame = talloc_stackframe();
984 struct event_context *ev;
985 struct tevent_req *req;
986 NTSTATUS status = NT_STATUS_NO_MEMORY;
987
988 ev = event_context_init(frame);
989 if (ev == NULL) {
990 goto fail;
991 }
992
993 req = open_socket_out_send(frame, ev, pss, port, timeout);
994 if (req == NULL) {
995 goto fail;
996 }
997 if (!tevent_req_poll(req, ev)) {
998 status = NT_STATUS_INTERNAL_ERROR;
999 goto fail;
1000 }
1001 status = open_socket_out_recv(req, pfd);
1002 fail:
1003 TALLOC_FREE(frame);
1004 return status;
1005 }
1006
1007 struct open_socket_out_defer_state {
1008 struct event_context *ev;
1009 struct sockaddr_storage ss;
1010 uint16_t port;
1011 int timeout;
1012 int fd;
1013 };
1014
1015 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1016 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1017
1018 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1019 struct event_context *ev,
1020 struct timeval wait_time,
1021 const struct sockaddr_storage *pss,
1022 uint16_t port,
1023 int timeout)
1024 {
1025 struct tevent_req *req, *subreq;
1026 struct open_socket_out_defer_state *state;
1027
1028 req = tevent_req_create(mem_ctx, &state,
1029 struct open_socket_out_defer_state);
1030 if (req == NULL) {
1031 return NULL;
1032 }
1033 state->ev = ev;
1034 state->ss = *pss;
1035 state->port = port;
1036 state->timeout = timeout;
1037
1038 subreq = tevent_wakeup_send(
1039 state, ev,
1040 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1041 if (subreq == NULL) {
1042 goto fail;
1043 }
1044 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1045 return req;
1046 fail:
1047 TALLOC_FREE(req);
1048 return NULL;
1049 }
1050
1051 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1052 {
1053 struct tevent_req *req = tevent_req_callback_data(
1054 subreq, struct tevent_req);
1055 struct open_socket_out_defer_state *state = tevent_req_data(
1056 req, struct open_socket_out_defer_state);
1057 bool ret;
1058
1059 ret = tevent_wakeup_recv(subreq);
1060 TALLOC_FREE(subreq);
1061 if (!ret) {
1062 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1063 return;
1064 }
1065
1066 subreq = open_socket_out_send(state, state->ev, &state->ss,
1067 state->port, state->timeout);
1068 if (tevent_req_nomem(subreq, req)) {
1069 return;
1070 }
1071 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1072 }
1073
1074 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1075 {
1076 struct tevent_req *req = tevent_req_callback_data(
1077 subreq, struct tevent_req);
1078 struct open_socket_out_defer_state *state = tevent_req_data(
1079 req, struct open_socket_out_defer_state);
1080 NTSTATUS status;
1081
1082 status = open_socket_out_recv(subreq, &state->fd);
1083 TALLOC_FREE(subreq);
1084 if (!NT_STATUS_IS_OK(status)) {
1085 tevent_req_nterror(req, status);
1086 return;
1087 }
1088 tevent_req_done(req);
1089 }
1090
1091 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1092 {
1093 struct open_socket_out_defer_state *state = tevent_req_data(
1094 req, struct open_socket_out_defer_state);
1095 NTSTATUS status;
1096
1097 if (tevent_req_is_nterror(req, &status)) {
1098 return status;
1099 }
1100 *pfd = state->fd;
1101 state->fd = -1;
1102 return NT_STATUS_OK;
1103 }
1104
1105 /*******************************************************************
1106 Create an outgoing TCP socket to the first addr that connects.
1107
1108 This is for simultaneous connection attempts to port 445 and 139 of a host
1109 or for simultatneous connection attempts to multiple DCs at once. We return
1110 a socket fd of the first successful connection.
1111
1112 @param[in] addrs list of Internet addresses and ports to connect to
1113 @param[in] num_addrs number of address/port pairs in the addrs list
1114 @param[in] timeout time after which we stop waiting for a socket connection
1115 to succeed, given in milliseconds
1116 @param[out] fd_index the entry in addrs which we successfully connected to
1117 @param[out] fd fd of the open and connected socket
1118 @return true on a successful connection, false if all connection attempts
1119 failed or we timed out
1120 *******************************************************************/
1121
1122 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1123 int timeout, int *fd_index, int *fd)
1124 {
1125 int i, resulting_index, res;
1126 int *sockets;
1127 bool good_connect;
1128
1129 fd_set r_fds, wr_fds;
1130 struct timeval tv;
1131 int maxfd;
1132
1133 int connect_loop = 10000; /* 10 milliseconds */
1134
1135 timeout *= 1000; /* convert to microseconds */
1136
1137 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1138
1139 if (sockets == NULL)
1140 return false;
1141
1142 resulting_index = -1;
1143
1144 for (i=0; i<num_addrs; i++)
1145 sockets[i] = -1;
1146
1147 for (i=0; i<num_addrs; i++) {
1148 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1149 if (sockets[i] < 0)
1150 goto done;
1151 set_blocking(sockets[i], false);
1152 }
1153
1154 connect_again:
1155 good_connect = false;
1156
1157 for (i=0; i<num_addrs; i++) {
1158 const struct sockaddr * a =
1159 (const struct sockaddr *)&(addrs[i]);
1160
1161 if (sockets[i] == -1)
1162 continue;
1163
1164 if (sys_connect(sockets[i], a) == 0) {
1165 /* Rather unlikely as we are non-blocking, but it
1166 * might actually happen. */
1167 resulting_index = i;
1168 goto done;
1169 }
1170
1171 if (errno == EINPROGRESS || errno == EALREADY ||
1172 #ifdef EISCONN
1173 errno == EISCONN ||
1174 #endif
1175 errno == EAGAIN || errno == EINTR) {
1176 /* These are the error messages that something is
1177 progressing. */
1178 good_connect = true;
1179 } else if (errno != 0) {
1180 /* There was a direct error */
1181 close(sockets[i]);
1182 sockets[i] = -1;
1183 }
1184 }
1185
1186 if (!good_connect) {
1187 /* All of the connect's resulted in real error conditions */
1188 goto done;
1189 }
1190
1191 /* Lets see if any of the connect attempts succeeded */
1192
1193 maxfd = 0;
1194 FD_ZERO(&wr_fds);
1195 FD_ZERO(&r_fds);
1196
1197 for (i=0; i<num_addrs; i++) {
1198 if (sockets[i] == -1)
1199 continue;
1200 FD_SET(sockets[i], &wr_fds);
1201 FD_SET(sockets[i], &r_fds);
1202 if (sockets[i]>maxfd)
1203 maxfd = sockets[i];
1204 }
1205
1206 tv.tv_sec = 0;
1207 tv.tv_usec = connect_loop;
1208
1209 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1210
1211 if (res < 0)
1212 goto done;
1213
1214 if (res == 0)
1215 goto next_round;
1216
1217 for (i=0; i<num_addrs; i++) {
1218
1219 if (sockets[i] == -1)
1220 continue;
1221
1222 /* Stevens, Network Programming says that if there's a
1223 * successful connect, the socket is only writable. Upon an
1224 * error, it's both readable and writable. */
1225
1226 if (FD_ISSET(sockets[i], &r_fds) &&
1227 FD_ISSET(sockets[i], &wr_fds)) {
1228 /* readable and writable, so it's an error */
1229 close(sockets[i]);
1230 sockets[i] = -1;
1231 continue;
1232 }
1233
1234 if (!FD_ISSET(sockets[i], &r_fds) &&
1235 FD_ISSET(sockets[i], &wr_fds)) {
1236 /* Only writable, so it's connected */
1237 resulting_index = i;
1238 goto done;
1239 }
1240 }
1241
1242 next_round:
1243
1244 timeout -= connect_loop;
1245 if (timeout <= 0)
1246 goto done;
1247 connect_loop *= 1.5;
1248 if (connect_loop > timeout)
1249 connect_loop = timeout;
1250 goto connect_again;
1251
1252 done:
1253 for (i=0; i<num_addrs; i++) {
1254 if (i == resulting_index)
1255 continue;
1256 if (sockets[i] >= 0)
1257 close(sockets[i]);
1258 }
1259
1260 if (resulting_index >= 0) {
1261 *fd_index = resulting_index;
1262 *fd = sockets[*fd_index];
1263 set_blocking(*fd, true);
1264 }
1265
1266 free(sockets);
1267
1268 return (resulting_index >= 0);
1269 }
1270 /****************************************************************************
1271 Open a connected UDP socket to host on port
1272 **************************************************************************/
1273
1274 int open_udp_socket(const char *host, int port)
1275 {
1276 struct sockaddr_storage ss;
1277 int res;
1278
1279 if (!interpret_string_addr(&ss, host, 0)) {
1280 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1281 host));
1282 return -1;
1283 }
1284
1285 res = socket(ss.ss_family, SOCK_DGRAM, 0);
1286 if (res == -1) {
1287 return -1;
1288 }
1289
1290 #if defined(HAVE_IPV6)
1291 if (ss.ss_family == AF_INET6) {
1292 struct sockaddr_in6 *psa6;
1293 psa6 = (struct sockaddr_in6 *)&ss;
1294 psa6->sin6_port = htons(port);
1295 if (psa6->sin6_scope_id == 0
1296 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1297 setup_linklocal_scope_id(
1298 (struct sockaddr *)&ss);
1299 }
1300 }
1301 #endif
1302 if (ss.ss_family == AF_INET) {
1303 struct sockaddr_in *psa;
1304 psa = (struct sockaddr_in *)&ss;
1305 psa->sin_port = htons(port);
1306 }
1307
1308 if (sys_connect(res,(struct sockaddr *)&ss)) {
1309 close(res);
1310 return -1;
1311 }
1312
1313 return res;
1314 }
1315
1316 /*******************************************************************
1317 Return the IP addr of the remote end of a socket as a string.
1318 Optionally return the struct sockaddr_storage.
1319 ******************************************************************/
1320
1321 static const char *get_peer_addr_internal(int fd,
1322 char *addr_buf,
1323 size_t addr_buf_len,
1324 struct sockaddr *pss,
1325 socklen_t *plength)
1326 {
1327 struct sockaddr_storage ss;
1328 socklen_t length = sizeof(ss);
1329
1330 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1331
1332 if (fd == -1) {
1333 return addr_buf;
1334 }
1335
1336 if (pss == NULL) {
1337 pss = (struct sockaddr *)&ss;
1338 plength = &length;
1339 }
1340
1341 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1342 int level = (errno == ENOTCONN) ? 2 : 0;
1343 DEBUG(level, ("getpeername failed. Error was %s\n",
1344 strerror(errno)));
1345 return addr_buf;
1346 }
1347
1348 print_sockaddr_len(addr_buf,
1349 addr_buf_len,
1350 pss,
1351 *plength);
1352 return addr_buf;
1353 }
1354
1355 /*******************************************************************
1356 Matchname - determine if host name matches IP address. Used to
1357 confirm a hostname lookup to prevent spoof attacks.
1358 ******************************************************************/
1359
1360 static bool matchname(const char *remotehost,
1361 const struct sockaddr *pss,
1362 socklen_t len)
1363 {
1364 struct addrinfo *res = NULL;
1365 struct addrinfo *ailist = NULL;
1366 char addr_buf[INET6_ADDRSTRLEN];
1367 bool ret = interpret_string_addr_internal(&ailist,
1368 remotehost,
1369 AI_ADDRCONFIG|AI_CANONNAME);
1370
1371 if (!ret || ailist == NULL) {
1372 DEBUG(3,("matchname: getaddrinfo failed for "
1373 "name %s [%s]\n",
1374 remotehost,
1375 gai_strerror(ret) ));
1376 return false;
1377 }
1378
1379 /*
1380 * Make sure that getaddrinfo() returns the "correct" host name.
1381 */
1382
1383 if (ailist->ai_canonname == NULL ||
1384 (!strequal(remotehost, ailist->ai_canonname) &&
1385 !strequal(remotehost, "localhost"))) {
1386 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1387 remotehost,
1388 ailist->ai_canonname ?
1389 ailist->ai_canonname : "(NULL)"));
1390 freeaddrinfo(ailist);
1391 return false;
1392 }
1393
1394 /* Look up the host address in the address list we just got. */
1395 for (res = ailist; res; res = res->ai_next) {
1396 if (!res->ai_addr) {
1397 continue;
1398 }
1399 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1400 (struct sockaddr *)pss)) {
1401 freeaddrinfo(ailist);
1402 return true;
1403 }
1404 }
1405
1406 /*
1407 * The host name does not map to the original host address. Perhaps
1408 * someone has compromised a name server. More likely someone botched
1409 * it, but that could be dangerous, too.
1410 */
1411
1412 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1413 print_sockaddr_len(addr_buf,
1414 sizeof(addr_buf),
1415 pss,
1416 len),
1417 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1418
1419 if (ailist) {
1420 freeaddrinfo(ailist);
1421 }
1422 return false;
1423 }
1424
1425 /*******************************************************************
1426 Deal with the singleton cache.
1427 ******************************************************************/
1428
1429 struct name_addr_pair {
1430 struct sockaddr_storage ss;
1431 const char *name;
1432 };
1433
1434 /*******************************************************************
1435 Lookup a name/addr pair. Returns memory allocated from memcache.
1436 ******************************************************************/
1437
1438 static bool lookup_nc(struct name_addr_pair *nc)
1439 {
1440 DATA_BLOB tmp;
1441
1442 ZERO_STRUCTP(nc);
1443
1444 if (!memcache_lookup(
1445 NULL, SINGLETON_CACHE,
1446 data_blob_string_const_null("get_peer_name"),
1447 &tmp)) {
1448 return false;
1449 }
1450
1451 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1452 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1453 return true;
1454 }
1455
1456 /*******************************************************************
1457 Save a name/addr pair.
1458 ******************************************************************/
1459
1460 static void store_nc(const struct name_addr_pair *nc)
1461 {
1462 DATA_BLOB tmp;
1463 size_t namelen = strlen(nc->name);
1464
1465 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1466 if (!tmp.data) {
1467 return;
1468 }
1469 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1470 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1471
1472 memcache_add(NULL, SINGLETON_CACHE,
1473 data_blob_string_const_null("get_peer_name"),
1474 tmp);
1475 data_blob_free(&tmp);
1476 }
1477
1478 /*******************************************************************
1479 Return the DNS name of the remote end of a socket.
1480 ******************************************************************/
1481
1482 const char *get_peer_name(int fd, bool force_lookup)
1483 {
1484 struct name_addr_pair nc;
1485 char addr_buf[INET6_ADDRSTRLEN];
1486 struct sockaddr_storage ss;
1487 socklen_t length = sizeof(ss);
1488 const char *p;
1489 int ret;
1490 char name_buf[MAX_DNS_NAME_LENGTH];
1491 char tmp_name[MAX_DNS_NAME_LENGTH];
1492
1493 /* reverse lookups can be *very* expensive, and in many
1494 situations won't work because many networks don't link dhcp
1495 with dns. To avoid the delay we avoid the lookup if
1496 possible */
1497 if (!lp_hostname_lookups() && (force_lookup == false)) {
1498 length = sizeof(nc.ss);
1499 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1500 (struct sockaddr *)&nc.ss, &length);
1501 store_nc(&nc);
1502 lookup_nc(&nc);
1503 return nc.name ? nc.name : "UNKNOWN";
1504 }
1505
1506 lookup_nc(&nc);
1507
1508 memset(&ss, '\0', sizeof(ss));
1509 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1510
1511 /* it might be the same as the last one - save some DNS work */
1512 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1513 return nc.name ? nc.name : "UNKNOWN";
1514 }
1515
1516 /* Not the same. We need to lookup. */
1517 if (fd == -1) {
1518 return "UNKNOWN";
1519 }
1520
1521 /* Look up the remote host name. */
1522 ret = sys_getnameinfo((struct sockaddr *)&ss,
1523 length,
1524 name_buf,
1525 sizeof(name_buf),
1526 NULL,
1527 0,
1528 0);
1529
1530 if (ret) {
1531 DEBUG(1,("get_peer_name: getnameinfo failed "
1532 "for %s with error %s\n",
1533 p,
1534 gai_strerror(ret)));
1535 strlcpy(name_buf, p, sizeof(name_buf));
1536 } else {
1537 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1538 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1539 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1540 }
1541 }
1542
1543 /* can't pass the same source and dest strings in when you
1544 use --enable-developer or the clobber_region() call will
1545 get you */
1546
1547 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1548 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1549 if (strstr(name_buf,"..")) {
1550 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1551 }
1552
1553 nc.name = name_buf;
1554 nc.ss = ss;
1555
1556 store_nc(&nc);
1557 lookup_nc(&nc);
1558 return nc.name ? nc.name : "UNKNOWN";
1559 }
1560
1561 /*******************************************************************
1562 Return the IP addr of the remote end of a socket as a string.
1563 ******************************************************************/
1564
1565 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1566 {
1567 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1568 }
1569
1570 /*******************************************************************
1571 Create protected unix domain socket.
1572
1573 Some unixes cannot set permissions on a ux-dom-sock, so we
1574 have to make sure that the directory contains the protection
1575 permissions instead.
1576 ******************************************************************/
1577
1578 int create_pipe_sock(const char *socket_dir,
1579 const char *socket_name,
1580 mode_t dir_perms)
1581 {
1582 #ifdef HAVE_UNIXSOCKET
1583 struct sockaddr_un sunaddr;
1584 struct stat st;
1585 int sock;
1586 mode_t old_umask;
1587 char *path = NULL;
1588
1589 old_umask = umask(0);
1590
1591 /* Create the socket directory or reuse the existing one */
1592
1593 if (lstat(socket_dir, &st) == -1) {
1594 if (errno == ENOENT) {
1595 /* Create directory */
1596 if (mkdir(socket_dir, dir_perms) == -1) {
1597 DEBUG(0, ("error creating socket directory "
1598 "%s: %s\n", socket_dir,
1599 strerror(errno)));
1600 goto out_umask;
1601 }
1602 } else {
1603 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1604 socket_dir, strerror(errno)));
1605 goto out_umask;
1606 }
1607 } else {
1608 /* Check ownership and permission on existing directory */
1609 if (!S_ISDIR(st.st_mode)) {
1610 DEBUG(0, ("socket directory %s isn't a directory\n",
1611 socket_dir));
1612 goto out_umask;
1613 }
1614 if ((st.st_uid != sec_initial_uid()) ||
1615 ((st.st_mode & 0777) != dir_perms)) {
1616 DEBUG(0, ("invalid permissions on socket directory "
1617 "%s\n", socket_dir));
1618 goto out_umask;
1619 }
1620 }
1621
1622 /* Create the socket file */
1623
1624 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1625
1626 if (sock == -1) {
1627 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1628 strerror(errno) ));
1629 goto out_close;
1630 }
1631
1632 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1633 goto out_close;
1634 }
1635
1636 unlink(path);
1637 memset(&sunaddr, 0, sizeof(sunaddr));
1638 sunaddr.sun_family = AF_UNIX;
1639 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1640
1641 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1642 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1643 strerror(errno)));
1644 goto out_close;
1645 }
1646
1647 if (listen(sock, 5) == -1) {
1648 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1649 strerror(errno)));
1650 goto out_close;
1651 }
1652
1653 SAFE_FREE(path);
1654
1655 umask(old_umask);
1656 return sock;
1657
1658 out_close:
1659 SAFE_FREE(path);
1660 if (sock != -1)
1661 close(sock);
1662
1663 out_umask:
1664 umask(old_umask);
1665 return -1;
1666
1667 #else
1668 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1669 return -1;
1670 #endif /* HAVE_UNIXSOCKET */
1671 }
1672
1673 /****************************************************************************
1674 Get my own canonical name, including domain.
1675 ****************************************************************************/
1676
1677 const char *get_mydnsfullname(void)
1678 {
1679 struct addrinfo *res = NULL;
1680 char my_hostname[HOST_NAME_MAX];
1681 bool ret;
1682 DATA_BLOB tmp;
1683
1684 if (memcache_lookup(NULL, SINGLETON_CACHE,
1685 data_blob_string_const_null("get_mydnsfullname"),
1686 &tmp)) {
1687 SMB_ASSERT(tmp.length > 0);
1688 return (const char *)tmp.data;
1689 }
1690
1691 /* get my host name */
1692 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1693 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1694 return NULL;
1695 }
1696
1697 /* Ensure null termination. */
1698 my_hostname[sizeof(my_hostname)-1] = '\0';
1699
1700 ret = interpret_string_addr_internal(&res,
1701 my_hostname,
1702 AI_ADDRCONFIG|AI_CANONNAME);
1703
1704 if (!ret || res == NULL) {
1705 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1706 "name %s [%s]\n",
1707 my_hostname,
1708 gai_strerror(ret) ));
1709 return NULL;
1710 }
1711
1712 /*
1713 * Make sure that getaddrinfo() returns the "correct" host name.
1714 */
1715
1716 if (res->ai_canonname == NULL) {
1717 DEBUG(3,("get_mydnsfullname: failed to get "
1718 "canonical name for %s\n",
1719 my_hostname));
1720 freeaddrinfo(res);
1721 return NULL;
1722 }
1723
1724 /* This copies the data, so we must do a lookup
1725 * afterwards to find the value to return.
1726 */
1727
1728 memcache_add(NULL, SINGLETON_CACHE,
1729 data_blob_string_const_null("get_mydnsfullname"),
1730 data_blob_string_const_null(res->ai_canonname));
1731
1732 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1733 data_blob_string_const_null("get_mydnsfullname"),
1734 &tmp)) {
1735 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1736 strlen(res->ai_canonname) + 1);
1737 }
1738
1739 freeaddrinfo(res);
1740
1741 return (const char *)tmp.data;
1742 }
1743
1744 /************************************************************
1745 Is this my name ?
1746 ************************************************************/
1747
1748 bool is_myname_or_ipaddr(const char *s)
1749 {
1750 TALLOC_CTX *ctx = talloc_tos();
1751 char addr[INET6_ADDRSTRLEN];
1752 char *name = NULL;
1753 const char *dnsname;
1754 char *servername = NULL;
1755
1756 if (!s) {
1757 return false;
1758 }
1759
1760 /* Santize the string from '\\name' */
1761 name = talloc_strdup(ctx, s);
1762 if (!name) {
1763 return false;
1764 }
1765
1766 servername = strrchr_m(name, '\\' );
1767 if (!servername) {
1768 servername = name;
1769 } else {
1770 servername++;
1771 }
1772
1773 /* Optimize for the common case */
1774 if (strequal(servername, global_myname())) {
1775 return true;
1776 }
1777
1778 /* Check for an alias */
1779 if (is_myname(servername)) {
1780 return true;
1781 }
1782
1783 /* Check for loopback */
1784 if (strequal(servername, "127.0.0.1") ||
1785 strequal(servername, "::1")) {
1786 return true;
1787 }
1788
1789 if (strequal(servername, "localhost")) {
1790 return true;
1791 }
1792
1793 /* Maybe it's my dns name */
1794 dnsname = get_mydnsfullname();
1795 if (dnsname && strequal(servername, dnsname)) {
1796 return true;
1797 }
1798
1799 /* Handle possible CNAME records - convert to an IP addr. */
1800 if (!is_ipaddress(servername)) {
1801 /* Use DNS to resolve the name, but only the first address */
1802 struct sockaddr_storage ss;
1803 if (interpret_string_addr(&ss, servername, 0)) {
1804 print_sockaddr(addr,
1805 sizeof(addr),
1806 &ss);
1807 servername = addr;
1808 }
1809 }
1810
1811 /* Maybe its an IP address? */
1812 if (is_ipaddress(servername)) {
1813 struct sockaddr_storage ss;
1814 struct iface_struct *nics;
1815 int i, n;
1816
1817 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1818 return false;
1819 }
1820
1821 if (ismyaddr((struct sockaddr *)&ss)) {
1822 return true;
1823 }
1824
1825 if (is_zero_addr((struct sockaddr *)&ss) ||
1826 is_loopback_addr((struct sockaddr *)&ss)) {
1827 return false;
1828 }
1829
1830 n = get_interfaces(talloc_tos(), &nics);
1831 for (i=0; i<n; i++) {
1832 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1833 TALLOC_FREE(nics);
1834 return true;
1835 }
1836 }
1837 TALLOC_FREE(nics);
1838 }
1839
1840 /* No match */
1841 return false;
1842 }
1843
1844 struct getaddrinfo_state {
1845 const char *node;
1846 const char *service;
1847 const struct addrinfo *hints;
1848 struct addrinfo *res;
1849 int ret;
1850 };
1851
1852 static void getaddrinfo_do(void *private_data);
1853 static void getaddrinfo_done(struct tevent_req *subreq);
1854
1855 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1856 struct tevent_context *ev,
1857 struct fncall_context *ctx,
1858 const char *node,
1859 const char *service,
1860 const struct addrinfo *hints)
1861 {
1862 struct tevent_req *req, *subreq;
1863 struct getaddrinfo_state *state;
1864
1865 req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
1866 if (req == NULL) {
1867 return NULL;
1868 }
1869
1870 state->node = node;
1871 state->service = service;
1872 state->hints = hints;
1873
1874 subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
1875 if (tevent_req_nomem(subreq, req)) {
1876 return tevent_req_post(req, ev);
1877 }
1878 tevent_req_set_callback(subreq, getaddrinfo_done, req);
1879 return req;
1880 }
1881
1882 static void getaddrinfo_do(void *private_data)
1883 {
1884 struct getaddrinfo_state *state =
1885 (struct getaddrinfo_state *)private_data;
1886
1887 state->ret = getaddrinfo(state->node, state->service, state->hints,
1888 &state->res);
1889 }
1890
1891 static void getaddrinfo_done(struct tevent_req *subreq)
1892 {
1893 struct tevent_req *req = tevent_req_callback_data(
1894 subreq, struct tevent_req);
1895 int ret, err;
1896
1897 ret = fncall_recv(subreq, &err);
1898 TALLOC_FREE(subreq);
1899 if (ret == -1) {
1900 tevent_req_error(req, err);
1901 return;
1902 }
1903 tevent_req_done(req);
1904 }
1905
1906 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
1907 {
1908 struct getaddrinfo_state *state = tevent_req_data(
1909 req, struct getaddrinfo_state);
1910 int err;
1911
1912 if (tevent_req_is_unix_error(req, &err)) {
1913 switch(err) {
1914 case ENOMEM:
1915 return EAI_MEMORY;
1916 default:
1917 return EAI_FAIL;
1918 }
1919 }
1920 if (state->ret == 0) {
1921 *res = state->res;
1922 }
1923 return state->ret;
1924 }