?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
s3: allow setting the TCP_QUICKACK socket option
[Samba/gebeck_regimport.git] / source3 / lib / util_sock.c
blobaf64f370baf18e33e60a78a1956e642b13b2444d
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 Map a text hostname or IP address (IPv4 or IPv6) into a
26 struct sockaddr_storage.
27 ******************************************************************/
28
29 bool interpret_string_addr(struct sockaddr_storage *pss,
30 const char *str,
31 int flags)
32 {
33 struct addrinfo *res = NULL;
34 #if defined(HAVE_IPV6)
35 char addr[INET6_ADDRSTRLEN];
36 unsigned int scope_id = 0;
37
38 if (strchr_m(str, ':')) {
39 char *p = strchr_m(str, '%');
40
41 /*
42 * Cope with link-local.
43 * This is IP:v6:addr%ifname.
44 */
45
46 if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
47 strlcpy(addr, str,
48 MIN(PTR_DIFF(p,str)+1,
49 sizeof(addr)));
50 str = addr;
51 }
52 }
53 #endif
54
55 zero_sockaddr(pss);
56
57 if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
58 return false;
59 }
60 if (!res) {
61 return false;
62 }
63 /* Copy the first sockaddr. */
64 memcpy(pss, res->ai_addr, res->ai_addrlen);
65
66 #if defined(HAVE_IPV6)
67 if (pss->ss_family == AF_INET6 && scope_id) {
68 struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
69 if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
70 ps6->sin6_scope_id == 0) {
71 ps6->sin6_scope_id = scope_id;
72 }
73 }
74 #endif
75
76 freeaddrinfo(res);
77 return true;
78 }
79
80 /*******************************************************************
81 Set an address to INADDR_ANY.
82 ******************************************************************/
83
84 void zero_sockaddr(struct sockaddr_storage *pss)
85 {
86 memset(pss, '\0', sizeof(*pss));
87 /* Ensure we're at least a valid sockaddr-storage. */
88 pss->ss_family = AF_INET;
89 }
90
91 /****************************************************************************
92 Get a port number in host byte order from a sockaddr_storage.
93 ****************************************************************************/
94
95 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
96 {
97 uint16_t port = 0;
98
99 if (pss->ss_family != AF_INET) {
100 #if defined(HAVE_IPV6)
101 /* IPv6 */
102 const struct sockaddr_in6 *sa6 =
103 (const struct sockaddr_in6 *)pss;
104 port = ntohs(sa6->sin6_port);
105 #endif
106 } else {
107 const struct sockaddr_in *sa =
108 (const struct sockaddr_in *)pss;
109 port = ntohs(sa->sin_port);
110 }
111 return port;
112 }
113
114 /****************************************************************************
115 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
116 ****************************************************************************/
117
118 static char *print_sockaddr_len(char *dest,
119 size_t destlen,
120 const struct sockaddr *psa,
121 socklen_t psalen)
122 {
123 if (destlen > 0) {
124 dest[0] = '\0';
125 }
126 (void)sys_getnameinfo(psa,
127 psalen,
128 dest, destlen,
129 NULL, 0,
130 NI_NUMERICHOST);
131 return dest;
132 }
133
134 /****************************************************************************
135 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
136 ****************************************************************************/
137
138 char *print_sockaddr(char *dest,
139 size_t destlen,
140 const struct sockaddr_storage *psa)
141 {
142 return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
143 sizeof(struct sockaddr_storage));
144 }
145
146 /****************************************************************************
147 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
148 ****************************************************************************/
149
150 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
151 const struct sockaddr_storage *pss)
152 {
153 char addr[INET6_ADDRSTRLEN];
154 char *dest = NULL;
155 int ret;
156
157 /* Linux getnameinfo() man pages says port is unitialized if
158 service name is NULL. */
159
160 ret = sys_getnameinfo((const struct sockaddr *)pss,
161 sizeof(struct sockaddr_storage),
162 addr, sizeof(addr),
163 NULL, 0,
164 NI_NUMERICHOST);
165 if (ret != 0) {
166 return NULL;
167 }
168
169 if (pss->ss_family != AF_INET) {
170 #if defined(HAVE_IPV6)
171 dest = talloc_asprintf(ctx, "[%s]", addr);
172 #else
173 return NULL;
174 #endif
175 } else {
176 dest = talloc_asprintf(ctx, "%s", addr);
177 }
178
179 return dest;
180 }
181
182 /****************************************************************************
183 Return the string of an IP address (IPv4 or IPv6).
184 ****************************************************************************/
185
186 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
187 {
188 struct sockaddr_storage sa;
189 socklen_t length = sizeof(sa);
190
191 /* Ok, returning a hard coded IPv4 address
192 * is bogus, but it's just as bogus as a
193 * zero IPv6 address. No good choice here.
194 */
195
196 strlcpy(addr_buf, "0.0.0.0", addr_len);
197
198 if (fd == -1) {
199 return addr_buf;
200 }
201
202 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
203 DEBUG(0,("getsockname failed. Error was %s\n",
204 strerror(errno) ));
205 return addr_buf;
206 }
207
208 return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
209 }
210
211 /****************************************************************************
212 Return the port number we've bound to on a socket.
213 ****************************************************************************/
214
215 int get_socket_port(int fd)
216 {
217 struct sockaddr_storage sa;
218 socklen_t length = sizeof(sa);
219
220 if (fd == -1) {
221 return -1;
222 }
223
224 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
225 DEBUG(0,("getpeername failed. Error was %s\n",
226 strerror(errno) ));
227 return -1;
228 }
229
230 #if defined(HAVE_IPV6)
231 if (sa.ss_family == AF_INET6) {
232 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
233 }
234 #endif
235 if (sa.ss_family == AF_INET) {
236 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
237 }
238 return -1;
239 }
240
241 const char *client_name(int fd)
242 {
243 return get_peer_name(fd,false);
244 }
245
246 const char *client_addr(int fd, char *addr, size_t addrlen)
247 {
248 return get_peer_addr(fd,addr,addrlen);
249 }
250
251 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
252 {
253 return get_socket_addr(fd, addr, addr_len);
254 }
255
256 #if 0
257 /* Not currently used. JRA. */
258 int client_socket_port(int fd)
259 {
260 return get_socket_port(fd);
261 }
262 #endif
263
264 /****************************************************************************
265 Accessor functions to make thread-safe code easier later...
266 ****************************************************************************/
267
268 void set_smb_read_error(enum smb_read_errors *pre,
269 enum smb_read_errors newerr)
270 {
271 if (pre) {
272 *pre = newerr;
273 }
274 }
275
276 void cond_set_smb_read_error(enum smb_read_errors *pre,
277 enum smb_read_errors newerr)
278 {
279 if (pre && *pre == SMB_READ_OK) {
280 *pre = newerr;
281 }
282 }
283
284 /****************************************************************************
285 Determine if a file descriptor is in fact a socket.
286 ****************************************************************************/
287
288 bool is_a_socket(int fd)
289 {
290 int v;
291 socklen_t l;
292 l = sizeof(int);
293 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
294 }
295
296 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
297
298 typedef struct smb_socket_option {
299 const char *name;
300 int level;
301 int option;
302 int value;
303 int opttype;
304 } smb_socket_option;
305
306 static const smb_socket_option socket_options[] = {
307 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
308 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
309 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
310 #ifdef TCP_NODELAY
311 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
312 #endif
313 #ifdef TCP_KEEPCNT
314 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
315 #endif
316 #ifdef TCP_KEEPIDLE
317 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
318 #endif
319 #ifdef TCP_KEEPINTVL
320 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
321 #endif
322 #ifdef IPTOS_LOWDELAY
323 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
324 #endif
325 #ifdef IPTOS_THROUGHPUT
326 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
327 #endif
328 #ifdef SO_REUSEPORT
329 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
330 #endif
331 #ifdef SO_SNDBUF
332 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
333 #endif
334 #ifdef SO_RCVBUF
335 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
336 #endif
337 #ifdef SO_SNDLOWAT
338 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
339 #endif
340 #ifdef SO_RCVLOWAT
341 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
342 #endif
343 #ifdef SO_SNDTIMEO
344 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
345 #endif
346 #ifdef SO_RCVTIMEO
347 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
348 #endif
349 #ifdef TCP_FASTACK
350 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
351 #endif
352 #ifdef TCP_QUICKACK
353 {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL},
354 #endif
355 {NULL,0,0,0,0}};
356
357 /****************************************************************************
358 Print socket options.
359 ****************************************************************************/
360
361 static void print_socket_options(int s)
362 {
363 int value;
364 socklen_t vlen = 4;
365 const smb_socket_option *p = &socket_options[0];
366
367 /* wrapped in if statement to prevent streams
368 * leak in SCO Openserver 5.0 */
369 /* reported on samba-technical --jerry */
370 if ( DEBUGLEVEL >= 5 ) {
371 DEBUG(5,("Socket options:\n"));
372 for (; p->name != NULL; p++) {
373 if (getsockopt(s, p->level, p->option,
374 (void *)&value, &vlen) == -1) {
375 DEBUGADD(5,("\tCould not test socket option %s.\n",
376 p->name));
377 } else {
378 DEBUGADD(5,("\t%s = %d\n",
379 p->name,value));
380 }
381 }
382 }
383 }
384
385 /****************************************************************************
386 Set user socket options.
387 ****************************************************************************/
388
389 void set_socket_options(int fd, const char *options)
390 {
391 TALLOC_CTX *ctx = talloc_stackframe();
392 char *tok;
393
394 while (next_token_talloc(ctx, &options, &tok," \t,")) {
395 int ret=0,i;
396 int value = 1;
397 char *p;
398 bool got_value = false;
399
400 if ((p = strchr_m(tok,'='))) {
401 *p = 0;
402 value = atoi(p+1);
403 got_value = true;
404 }
405
406 for (i=0;socket_options[i].name;i++)
407 if (strequal(socket_options[i].name,tok))
408 break;
409
410 if (!socket_options[i].name) {
411 DEBUG(0,("Unknown socket option %s\n",tok));
412 continue;
413 }
414
415 switch (socket_options[i].opttype) {
416 case OPT_BOOL:
417 case OPT_INT:
418 ret = setsockopt(fd,socket_options[i].level,
419 socket_options[i].option,
420 (char *)&value,sizeof(int));
421 break;
422
423 case OPT_ON:
424 if (got_value)
425 DEBUG(0,("syntax error - %s "
426 "does not take a value\n",tok));
427
428 {
429 int on = socket_options[i].value;
430 ret = setsockopt(fd,socket_options[i].level,
431 socket_options[i].option,
432 (char *)&on,sizeof(int));
433 }
434 break;
435 }
436
437 if (ret != 0) {
438 /* be aware that some systems like Solaris return
439 * EINVAL to a setsockopt() call when the client
440 * sent a RST previously - no need to worry */
441 DEBUG(2,("Failed to set socket option %s (Error %s)\n",
442 tok, strerror(errno) ));
443 }
444 }
445
446 TALLOC_FREE(ctx);
447 print_socket_options(fd);
448 }
449
450 /****************************************************************************
451 Read from a socket.
452 ****************************************************************************/
453
454 ssize_t read_udp_v4_socket(int fd,
455 char *buf,
456 size_t len,
457 struct sockaddr_storage *psa)
458 {
459 ssize_t ret;
460 socklen_t socklen = sizeof(*psa);
461 struct sockaddr_in *si = (struct sockaddr_in *)psa;
462
463 memset((char *)psa,'\0',socklen);
464
465 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
466 (struct sockaddr *)psa,&socklen);
467 if (ret <= 0) {
468 /* Don't print a low debug error for a non-blocking socket. */
469 if (errno == EAGAIN) {
470 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
471 } else {
472 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
473 strerror(errno)));
474 }
475 return 0;
476 }
477
478 if (psa->ss_family != AF_INET) {
479 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
480 "(not IPv4)\n", (int)psa->ss_family));
481 return 0;
482 }
483
484 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
485 inet_ntoa(si->sin_addr),
486 si->sin_port,
487 (unsigned long)ret));
488
489 return ret;
490 }
491
492 /****************************************************************************
493 Read data from a socket with a timout in msec.
494 mincount = if timeout, minimum to read before returning
495 maxcount = number to be read.
496 time_out = timeout in milliseconds
497 ****************************************************************************/
498
499 NTSTATUS read_socket_with_timeout(int fd, char *buf,
500 size_t mincnt, size_t maxcnt,
501 unsigned int time_out,
502 size_t *size_ret)
503 {
504 fd_set fds;
505 int selrtn;
506 ssize_t readret;
507 size_t nread = 0;
508 struct timeval timeout;
509 char addr[INET6_ADDRSTRLEN];
510
511 /* just checking .... */
512 if (maxcnt <= 0)
513 return NT_STATUS_OK;
514
515 /* Blocking read */
516 if (time_out == 0) {
517 if (mincnt == 0) {
518 mincnt = maxcnt;
519 }
520
521 while (nread < mincnt) {
522 readret = sys_recv(fd, buf + nread, maxcnt - nread, 0);
523
524 if (readret == 0) {
525 DEBUG(5,("read_socket_with_timeout: "
526 "blocking read. EOF from client.\n"));
527 return NT_STATUS_END_OF_FILE;
528 }
529
530 if (readret == -1) {
531 if (fd == get_client_fd()) {
532 /* Try and give an error message
533 * saying what client failed. */
534 DEBUG(0,("read_socket_with_timeout: "
535 "client %s read error = %s.\n",
536 get_peer_addr(fd,addr,sizeof(addr)),
537 strerror(errno) ));
538 } else {
539 DEBUG(0,("read_socket_with_timeout: "
540 "read error = %s.\n",
541 strerror(errno) ));
542 }
543 return map_nt_error_from_unix(errno);
544 }
545 nread += readret;
546 }
547 goto done;
548 }
549
550 /* Most difficult - timeout read */
551 /* If this is ever called on a disk file and
552 mincnt is greater then the filesize then
553 system performance will suffer severely as
554 select always returns true on disk files */
555
556 /* Set initial timeout */
557 timeout.tv_sec = (time_t)(time_out / 1000);
558 timeout.tv_usec = (long)(1000 * (time_out % 1000));
559
560 for (nread=0; nread < mincnt; ) {
561 FD_ZERO(&fds);
562 FD_SET(fd,&fds);
563
564 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
565
566 /* Check if error */
567 if (selrtn == -1) {
568 /* something is wrong. Maybe the socket is dead? */
569 if (fd == get_client_fd()) {
570 /* Try and give an error message saying
571 * what client failed. */
572 DEBUG(0,("read_socket_with_timeout: timeout "
573 "read for client %s. select error = %s.\n",
574 get_peer_addr(fd,addr,sizeof(addr)),
575 strerror(errno) ));
576 } else {
577 DEBUG(0,("read_socket_with_timeout: timeout "
578 "read. select error = %s.\n",
579 strerror(errno) ));
580 }
581 return map_nt_error_from_unix(errno);
582 }
583
584 /* Did we timeout ? */
585 if (selrtn == 0) {
586 DEBUG(10,("read_socket_with_timeout: timeout read. "
587 "select timed out.\n"));
588 return NT_STATUS_IO_TIMEOUT;
589 }
590
591 readret = sys_recv(fd, buf+nread, maxcnt-nread, 0);
592
593 if (readret == 0) {
594 /* we got EOF on the file descriptor */
595 DEBUG(5,("read_socket_with_timeout: timeout read. "
596 "EOF from client.\n"));
597 return NT_STATUS_END_OF_FILE;
598 }
599
600 if (readret == -1) {
601 /* the descriptor is probably dead */
602 if (fd == get_client_fd()) {
603 /* Try and give an error message
604 * saying what client failed. */
605 DEBUG(0,("read_socket_with_timeout: timeout "
606 "read to client %s. read error = %s.\n",
607 get_peer_addr(fd,addr,sizeof(addr)),
608 strerror(errno) ));
609 } else {
610 DEBUG(0,("read_socket_with_timeout: timeout "
611 "read. read error = %s.\n",
612 strerror(errno) ));
613 }
614 return map_nt_error_from_unix(errno);
615 }
616
617 nread += readret;
618 }
619
620 done:
621 /* Return the number we got */
622 if (size_ret) {
623 *size_ret = nread;
624 }
625 return NT_STATUS_OK;
626 }
627
628 /****************************************************************************
629 Read data from the client, reading exactly N bytes.
630 ****************************************************************************/
631
632 NTSTATUS read_data(int fd, char *buffer, size_t N)
633 {
634 return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
635 }
636
637 /****************************************************************************
638 Write all data from an iov array
639 ****************************************************************************/
640
641 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
642 {
643 int i;
644 size_t to_send;
645 ssize_t thistime;
646 size_t sent;
647 struct iovec *iov_copy, *iov;
648
649 to_send = 0;
650 for (i=0; i<iovcnt; i++) {
651 to_send += orig_iov[i].iov_len;
652 }
653
654 thistime = sys_writev(fd, orig_iov, iovcnt);
655 if ((thistime <= 0) || (thistime == to_send)) {
656 return thistime;
657 }
658 sent = thistime;
659
660 /*
661 * We could not send everything in one call. Make a copy of iov that
662 * we can mess with. We keep a copy of the array start in iov_copy for
663 * the TALLOC_FREE, because we're going to modify iov later on,
664 * discarding elements.
665 */
666
667 iov_copy = (struct iovec *)TALLOC_MEMDUP(
668 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
669
670 if (iov_copy == NULL) {
671 errno = ENOMEM;
672 return -1;
673 }
674 iov = iov_copy;
675
676 while (sent < to_send) {
677 /*
678 * We have to discard "thistime" bytes from the beginning
679 * iov array, "thistime" contains the number of bytes sent
680 * via writev last.
681 */
682 while (thistime > 0) {
683 if (thistime < iov[0].iov_len) {
684 char *new_base =
685 (char *)iov[0].iov_base + thistime;
686 iov[0].iov_base = (void *)new_base;
687 iov[0].iov_len -= thistime;
688 break;
689 }
690 thistime -= iov[0].iov_len;
691 iov += 1;
692 iovcnt -= 1;
693 }
694
695 thistime = sys_writev(fd, iov, iovcnt);
696 if (thistime <= 0) {
697 break;
698 }
699 sent += thistime;
700 }
701
702 TALLOC_FREE(iov_copy);
703 return sent;
704 }
705
706 /****************************************************************************
707 Write data to a fd.
708 ****************************************************************************/
709
710 ssize_t write_data(int fd, const char *buffer, size_t N)
711 {
712 ssize_t ret;
713 struct iovec iov;
714
715 iov.iov_base = CONST_DISCARD(void *, buffer);
716 iov.iov_len = N;
717
718 ret = write_data_iov(fd, &iov, 1);
719 if (ret >= 0) {
720 return ret;
721 }
722
723 if (fd == get_client_fd()) {
724 char addr[INET6_ADDRSTRLEN];
725 /*
726 * Try and give an error message saying what client failed.
727 */
728 DEBUG(0, ("write_data: write failure in writing to client %s. "
729 "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
730 strerror(errno)));
731 } else {
732 DEBUG(0,("write_data: write failure. Error = %s\n",
733 strerror(errno) ));
734 }
735
736 return -1;
737 }
738
739 /****************************************************************************
740 Send a keepalive packet (rfc1002).
741 ****************************************************************************/
742
743 bool send_keepalive(int client)
744 {
745 unsigned char buf[4];
746
747 buf[0] = SMBkeepalive;
748 buf[1] = buf[2] = buf[3] = 0;
749
750 return(write_data(client,(char *)buf,4) == 4);
751 }
752
753 /****************************************************************************
754 Read 4 bytes of a smb packet and return the smb length of the packet.
755 Store the result in the buffer.
756 This version of the function will return a length of zero on receiving
757 a keepalive packet.
758 Timeout is in milliseconds.
759 ****************************************************************************/
760
761 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
762 unsigned int timeout,
763 size_t *len)
764 {
765 int msg_type;
766 NTSTATUS status;
767
768 status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
769
770 if (!NT_STATUS_IS_OK(status)) {
771 return status;
772 }
773
774 *len = smb_len(inbuf);
775 msg_type = CVAL(inbuf,0);
776
777 if (msg_type == SMBkeepalive) {
778 DEBUG(5,("Got keepalive packet\n"));
779 }
780
781 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
782
783 return NT_STATUS_OK;
784 }
785
786 /****************************************************************************
787 Read 4 bytes of a smb packet and return the smb length of the packet.
788 Store the result in the buffer. This version of the function will
789 never return a session keepalive (length of zero).
790 Timeout is in milliseconds.
791 ****************************************************************************/
792
793 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
794 size_t *len)
795 {
796 uint8_t msgtype = SMBkeepalive;
797
798 while (msgtype == SMBkeepalive) {
799 NTSTATUS status;
800
801 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
802 len);
803 if (!NT_STATUS_IS_OK(status)) {
804 return status;
805 }
806
807 msgtype = CVAL(inbuf, 0);
808 }
809
810 DEBUG(10,("read_smb_length: got smb length of %lu\n",
811 (unsigned long)len));
812
813 return NT_STATUS_OK;
814 }
815
816 /****************************************************************************
817 Read an smb from a fd.
818 The timeout is in milliseconds.
819 This function will return on receipt of a session keepalive packet.
820 maxlen is the max number of bytes to return, not including the 4 byte
821 length. If zero it means buflen limit.
822 Doesn't check the MAC on signed packets.
823 ****************************************************************************/
824
825 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
826 size_t maxlen, size_t *p_len)
827 {
828 size_t len;
829 NTSTATUS status;
830
831 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
832
833 if (!NT_STATUS_IS_OK(status)) {
834 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
835 return status;
836 }
837
838 if (len > buflen) {
839 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
840 (unsigned long)len));
841 return NT_STATUS_INVALID_PARAMETER;
842 }
843
844 if(len > 0) {
845 if (maxlen) {
846 len = MIN(len,maxlen);
847 }
848
849 status = read_socket_with_timeout(
850 fd, buffer+4, len, len, timeout, &len);
851
852 if (!NT_STATUS_IS_OK(status)) {
853 return status;
854 }
855
856 /* not all of samba3 properly checks for packet-termination
857 * of strings. This ensures that we don't run off into
858 * empty space. */
859 SSVAL(buffer+4,len, 0);
860 }
861
862 *p_len = len;
863 return NT_STATUS_OK;
864 }
865
866 /****************************************************************************
867 Open a socket of the specified type, port, and address for incoming data.
868 ****************************************************************************/
869
870 int open_socket_in(int type,
871 uint16_t port,
872 int dlevel,
873 const struct sockaddr_storage *psock,
874 bool rebind)
875 {
876 struct sockaddr_storage sock;
877 int res;
878 socklen_t slen = sizeof(struct sockaddr_in);
879
880 sock = *psock;
881
882 #if defined(HAVE_IPV6)
883 if (sock.ss_family == AF_INET6) {
884 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
885 slen = sizeof(struct sockaddr_in6);
886 }
887 #endif
888 if (sock.ss_family == AF_INET) {
889 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
890 }
891
892 res = socket(sock.ss_family, type, 0 );
893 if( res == -1 ) {
894 if( DEBUGLVL(0) ) {
895 dbgtext( "open_socket_in(): socket() call failed: " );
896 dbgtext( "%s\n", strerror( errno ) );
897 }
898 return -1;
899 }
900
901 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
902 {
903 int val = rebind ? 1 : 0;
904 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
905 (char *)&val,sizeof(val)) == -1 ) {
906 if( DEBUGLVL( dlevel ) ) {
907 dbgtext( "open_socket_in(): setsockopt: " );
908 dbgtext( "SO_REUSEADDR = %s ",
909 val?"true":"false" );
910 dbgtext( "on port %d failed ", port );
911 dbgtext( "with error = %s\n", strerror(errno) );
912 }
913 }
914 #ifdef SO_REUSEPORT
915 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
916 (char *)&val,sizeof(val)) == -1 ) {
917 if( DEBUGLVL( dlevel ) ) {
918 dbgtext( "open_socket_in(): setsockopt: ");
919 dbgtext( "SO_REUSEPORT = %s ",
920 val?"true":"false");
921 dbgtext( "on port %d failed ", port);
922 dbgtext( "with error = %s\n", strerror(errno));
923 }
924 }
925 #endif /* SO_REUSEPORT */
926 }
927
928 /* now we've got a socket - we need to bind it */
929 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
930 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
931 port == SMB_PORT2 || port == NMB_PORT) ) {
932 char addr[INET6_ADDRSTRLEN];
933 print_sockaddr(addr, sizeof(addr),
934 &sock);
935 dbgtext( "bind failed on port %d ", port);
936 dbgtext( "socket_addr = %s.\n", addr);
937 dbgtext( "Error = %s\n", strerror(errno));
938 }
939 close(res);
940 return -1;
941 }
942
943 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
944 return( res );
945 }
946
947 struct open_socket_out_state {
948 int fd;
949 struct event_context *ev;
950 struct sockaddr_storage ss;
951 socklen_t salen;
952 uint16_t port;
953 int wait_nsec;
954 };
955
956 static void open_socket_out_connected(struct tevent_req *subreq);
957
958 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
959 {
960 if (s->fd != -1) {
961 close(s->fd);
962 }
963 return 0;
964 }
965
966 /****************************************************************************
967 Create an outgoing socket. timeout is in milliseconds.
968 **************************************************************************/
969
970 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
971 struct event_context *ev,
972 const struct sockaddr_storage *pss,
973 uint16_t port,
974 int timeout)
975 {
976 char addr[INET6_ADDRSTRLEN];
977 struct tevent_req *result, *subreq;
978 struct open_socket_out_state *state;
979 NTSTATUS status;
980
981 result = tevent_req_create(mem_ctx, &state,
982 struct open_socket_out_state);
983 if (result == NULL) {
984 return NULL;
985 }
986 state->ev = ev;
987 state->ss = *pss;
988 state->port = port;
989 state->wait_nsec = 10000;
990 state->salen = -1;
991
992 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
993 if (state->fd == -1) {
994 status = map_nt_error_from_unix(errno);
995 goto post_status;
996 }
997 talloc_set_destructor(state, open_socket_out_state_destructor);
998
999 if (!tevent_req_set_endtime(
1000 result, ev, timeval_current_ofs(0, timeout*1000))) {
1001 goto fail;
1002 }
1003
1004 #if defined(HAVE_IPV6)
1005 if (pss->ss_family == AF_INET6) {
1006 struct sockaddr_in6 *psa6;
1007 psa6 = (struct sockaddr_in6 *)&state->ss;
1008 psa6->sin6_port = htons(port);
1009 if (psa6->sin6_scope_id == 0
1010 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1011 setup_linklocal_scope_id(
1012 (struct sockaddr *)&(state->ss));
1013 }
1014 state->salen = sizeof(struct sockaddr_in6);
1015 }
1016 #endif
1017 if (pss->ss_family == AF_INET) {
1018 struct sockaddr_in *psa;
1019 psa = (struct sockaddr_in *)&state->ss;
1020 psa->sin_port = htons(port);
1021 state->salen = sizeof(struct sockaddr_in);
1022 }
1023
1024 if (pss->ss_family == AF_UNIX) {
1025 state->salen = sizeof(struct sockaddr_un);
1026 }
1027
1028 print_sockaddr(addr, sizeof(addr), &state->ss);
1029 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1030
1031 subreq = async_connect_send(state, state->ev, state->fd,
1032 (struct sockaddr *)&state->ss,
1033 state->salen);
1034 if ((subreq == NULL)
1035 || !tevent_req_set_endtime(
1036 subreq, state->ev,
1037 timeval_current_ofs(0, state->wait_nsec))) {
1038 goto fail;
1039 }
1040 tevent_req_set_callback(subreq, open_socket_out_connected, result);
1041 return result;
1042
1043 post_status:
1044 tevent_req_nterror(result, status);
1045 return tevent_req_post(result, ev);
1046 fail:
1047 TALLOC_FREE(result);
1048 return NULL;
1049 }
1050
1051 static void open_socket_out_connected(struct tevent_req *subreq)
1052 {
1053 struct tevent_req *req =
1054 tevent_req_callback_data(subreq, struct tevent_req);
1055 struct open_socket_out_state *state =
1056 tevent_req_data(req, struct open_socket_out_state);
1057 int ret;
1058 int sys_errno;
1059
1060 ret = async_connect_recv(subreq, &sys_errno);
1061 TALLOC_FREE(subreq);
1062 if (ret == 0) {
1063 tevent_req_done(req);
1064 return;
1065 }
1066
1067 if (
1068 #ifdef ETIMEDOUT
1069 (sys_errno == ETIMEDOUT) ||
1070 #endif
1071 (sys_errno == EINPROGRESS) ||
1072 (sys_errno == EALREADY) ||
1073 (sys_errno == EAGAIN)) {
1074
1075 /*
1076 * retry
1077 */
1078
1079 if (state->wait_nsec < 250000) {
1080 state->wait_nsec *= 1.5;
1081 }
1082
1083 subreq = async_connect_send(state, state->ev, state->fd,
1084 (struct sockaddr *)&state->ss,
1085 state->salen);
1086 if (tevent_req_nomem(subreq, req)) {
1087 return;
1088 }
1089 if (!tevent_req_set_endtime(
1090 subreq, state->ev,
1091 timeval_current_ofs(0, state->wait_nsec))) {
1092 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1093 return;
1094 }
1095 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1096 return;
1097 }
1098
1099 #ifdef EISCONN
1100 if (sys_errno == EISCONN) {
1101 tevent_req_done(req);
1102 return;
1103 }
1104 #endif
1105
1106 /* real error */
1107 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1108 }
1109
1110 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1111 {
1112 struct open_socket_out_state *state =
1113 tevent_req_data(req, struct open_socket_out_state);
1114 NTSTATUS status;
1115
1116 if (tevent_req_is_nterror(req, &status)) {
1117 return status;
1118 }
1119 *pfd = state->fd;
1120 state->fd = -1;
1121 return NT_STATUS_OK;
1122 }
1123
1124 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1125 int timeout, int *pfd)
1126 {
1127 TALLOC_CTX *frame = talloc_stackframe();
1128 struct event_context *ev;
1129 struct tevent_req *req;
1130 NTSTATUS status = NT_STATUS_NO_MEMORY;
1131
1132 ev = event_context_init(frame);
1133 if (ev == NULL) {
1134 goto fail;
1135 }
1136
1137 req = open_socket_out_send(frame, ev, pss, port, timeout);
1138 if (req == NULL) {
1139 goto fail;
1140 }
1141 if (!tevent_req_poll(req, ev)) {
1142 status = NT_STATUS_INTERNAL_ERROR;
1143 goto fail;
1144 }
1145 status = open_socket_out_recv(req, pfd);
1146 fail:
1147 TALLOC_FREE(frame);
1148 return status;
1149 }
1150
1151 struct open_socket_out_defer_state {
1152 struct event_context *ev;
1153 struct sockaddr_storage ss;
1154 uint16_t port;
1155 int timeout;
1156 int fd;
1157 };
1158
1159 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1160 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1161
1162 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1163 struct event_context *ev,
1164 struct timeval wait_time,
1165 const struct sockaddr_storage *pss,
1166 uint16_t port,
1167 int timeout)
1168 {
1169 struct tevent_req *req, *subreq;
1170 struct open_socket_out_defer_state *state;
1171
1172 req = tevent_req_create(mem_ctx, &state,
1173 struct open_socket_out_defer_state);
1174 if (req == NULL) {
1175 return NULL;
1176 }
1177 state->ev = ev;
1178 state->ss = *pss;
1179 state->port = port;
1180 state->timeout = timeout;
1181
1182 subreq = tevent_wakeup_send(
1183 state, ev,
1184 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1185 if (subreq == NULL) {
1186 goto fail;
1187 }
1188 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1189 return req;
1190 fail:
1191 TALLOC_FREE(req);
1192 return NULL;
1193 }
1194
1195 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1196 {
1197 struct tevent_req *req = tevent_req_callback_data(
1198 subreq, struct tevent_req);
1199 struct open_socket_out_defer_state *state = tevent_req_data(
1200 req, struct open_socket_out_defer_state);
1201 bool ret;
1202
1203 ret = tevent_wakeup_recv(subreq);
1204 TALLOC_FREE(subreq);
1205 if (!ret) {
1206 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1207 return;
1208 }
1209
1210 subreq = open_socket_out_send(state, state->ev, &state->ss,
1211 state->port, state->timeout);
1212 if (tevent_req_nomem(subreq, req)) {
1213 return;
1214 }
1215 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1216 }
1217
1218 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1219 {
1220 struct tevent_req *req = tevent_req_callback_data(
1221 subreq, struct tevent_req);
1222 struct open_socket_out_defer_state *state = tevent_req_data(
1223 req, struct open_socket_out_defer_state);
1224 NTSTATUS status;
1225
1226 status = open_socket_out_recv(subreq, &state->fd);
1227 TALLOC_FREE(subreq);
1228 if (!NT_STATUS_IS_OK(status)) {
1229 tevent_req_nterror(req, status);
1230 return;
1231 }
1232 tevent_req_done(req);
1233 }
1234
1235 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1236 {
1237 struct open_socket_out_defer_state *state = tevent_req_data(
1238 req, struct open_socket_out_defer_state);
1239 NTSTATUS status;
1240
1241 if (tevent_req_is_nterror(req, &status)) {
1242 return status;
1243 }
1244 *pfd = state->fd;
1245 state->fd = -1;
1246 return NT_STATUS_OK;
1247 }
1248
1249 /*******************************************************************
1250 Create an outgoing TCP socket to the first addr that connects.
1251
1252 This is for simultaneous connection attempts to port 445 and 139 of a host
1253 or for simultatneous connection attempts to multiple DCs at once. We return
1254 a socket fd of the first successful connection.
1255
1256 @param[in] addrs list of Internet addresses and ports to connect to
1257 @param[in] num_addrs number of address/port pairs in the addrs list
1258 @param[in] timeout time after which we stop waiting for a socket connection
1259 to succeed, given in milliseconds
1260 @param[out] fd_index the entry in addrs which we successfully connected to
1261 @param[out] fd fd of the open and connected socket
1262 @return true on a successful connection, false if all connection attempts
1263 failed or we timed out
1264 *******************************************************************/
1265
1266 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1267 int timeout, int *fd_index, int *fd)
1268 {
1269 int i, resulting_index, res;
1270 int *sockets;
1271 bool good_connect;
1272
1273 fd_set r_fds, wr_fds;
1274 struct timeval tv;
1275 int maxfd;
1276
1277 int connect_loop = 10000; /* 10 milliseconds */
1278
1279 timeout *= 1000; /* convert to microseconds */
1280
1281 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1282
1283 if (sockets == NULL)
1284 return false;
1285
1286 resulting_index = -1;
1287
1288 for (i=0; i<num_addrs; i++)
1289 sockets[i] = -1;
1290
1291 for (i=0; i<num_addrs; i++) {
1292 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1293 if (sockets[i] < 0)
1294 goto done;
1295 set_blocking(sockets[i], false);
1296 }
1297
1298 connect_again:
1299 good_connect = false;
1300
1301 for (i=0; i<num_addrs; i++) {
1302 const struct sockaddr * a =
1303 (const struct sockaddr *)&(addrs[i]);
1304
1305 if (sockets[i] == -1)
1306 continue;
1307
1308 if (sys_connect(sockets[i], a) == 0) {
1309 /* Rather unlikely as we are non-blocking, but it
1310 * might actually happen. */
1311 resulting_index = i;
1312 goto done;
1313 }
1314
1315 if (errno == EINPROGRESS || errno == EALREADY ||
1316 #ifdef EISCONN
1317 errno == EISCONN ||
1318 #endif
1319 errno == EAGAIN || errno == EINTR) {
1320 /* These are the error messages that something is
1321 progressing. */
1322 good_connect = true;
1323 } else if (errno != 0) {
1324 /* There was a direct error */
1325 close(sockets[i]);
1326 sockets[i] = -1;
1327 }
1328 }
1329
1330 if (!good_connect) {
1331 /* All of the connect's resulted in real error conditions */
1332 goto done;
1333 }
1334
1335 /* Lets see if any of the connect attempts succeeded */
1336
1337 maxfd = 0;
1338 FD_ZERO(&wr_fds);
1339 FD_ZERO(&r_fds);
1340
1341 for (i=0; i<num_addrs; i++) {
1342 if (sockets[i] == -1)
1343 continue;
1344 FD_SET(sockets[i], &wr_fds);
1345 FD_SET(sockets[i], &r_fds);
1346 if (sockets[i]>maxfd)
1347 maxfd = sockets[i];
1348 }
1349
1350 tv.tv_sec = 0;
1351 tv.tv_usec = connect_loop;
1352
1353 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1354
1355 if (res < 0)
1356 goto done;
1357
1358 if (res == 0)
1359 goto next_round;
1360
1361 for (i=0; i<num_addrs; i++) {
1362
1363 if (sockets[i] == -1)
1364 continue;
1365
1366 /* Stevens, Network Programming says that if there's a
1367 * successful connect, the socket is only writable. Upon an
1368 * error, it's both readable and writable. */
1369
1370 if (FD_ISSET(sockets[i], &r_fds) &&
1371 FD_ISSET(sockets[i], &wr_fds)) {
1372 /* readable and writable, so it's an error */
1373 close(sockets[i]);
1374 sockets[i] = -1;
1375 continue;
1376 }
1377
1378 if (!FD_ISSET(sockets[i], &r_fds) &&
1379 FD_ISSET(sockets[i], &wr_fds)) {
1380 /* Only writable, so it's connected */
1381 resulting_index = i;
1382 goto done;
1383 }
1384 }
1385
1386 next_round:
1387
1388 timeout -= connect_loop;
1389 if (timeout <= 0)
1390 goto done;
1391 connect_loop *= 1.5;
1392 if (connect_loop > timeout)
1393 connect_loop = timeout;
1394 goto connect_again;
1395
1396 done:
1397 for (i=0; i<num_addrs; i++) {
1398 if (i == resulting_index)
1399 continue;
1400 if (sockets[i] >= 0)
1401 close(sockets[i]);
1402 }
1403
1404 if (resulting_index >= 0) {
1405 *fd_index = resulting_index;
1406 *fd = sockets[*fd_index];
1407 set_blocking(*fd, true);
1408 }
1409
1410 free(sockets);
1411
1412 return (resulting_index >= 0);
1413 }
1414 /****************************************************************************
1415 Open a connected UDP socket to host on port
1416 **************************************************************************/
1417
1418 int open_udp_socket(const char *host, int port)
1419 {
1420 struct sockaddr_storage ss;
1421 int res;
1422
1423 if (!interpret_string_addr(&ss, host, 0)) {
1424 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1425 host));
1426 return -1;
1427 }
1428
1429 res = socket(ss.ss_family, SOCK_DGRAM, 0);
1430 if (res == -1) {
1431 return -1;
1432 }
1433
1434 #if defined(HAVE_IPV6)
1435 if (ss.ss_family == AF_INET6) {
1436 struct sockaddr_in6 *psa6;
1437 psa6 = (struct sockaddr_in6 *)&ss;
1438 psa6->sin6_port = htons(port);
1439 if (psa6->sin6_scope_id == 0
1440 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1441 setup_linklocal_scope_id(
1442 (struct sockaddr *)&ss);
1443 }
1444 }
1445 #endif
1446 if (ss.ss_family == AF_INET) {
1447 struct sockaddr_in *psa;
1448 psa = (struct sockaddr_in *)&ss;
1449 psa->sin_port = htons(port);
1450 }
1451
1452 if (sys_connect(res,(struct sockaddr *)&ss)) {
1453 close(res);
1454 return -1;
1455 }
1456
1457 return res;
1458 }
1459
1460 /*******************************************************************
1461 Return the IP addr of the remote end of a socket as a string.
1462 Optionally return the struct sockaddr_storage.
1463 ******************************************************************/
1464
1465 static const char *get_peer_addr_internal(int fd,
1466 char *addr_buf,
1467 size_t addr_buf_len,
1468 struct sockaddr *pss,
1469 socklen_t *plength)
1470 {
1471 struct sockaddr_storage ss;
1472 socklen_t length = sizeof(ss);
1473
1474 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1475
1476 if (fd == -1) {
1477 return addr_buf;
1478 }
1479
1480 if (pss == NULL) {
1481 pss = (struct sockaddr *)&ss;
1482 plength = &length;
1483 }
1484
1485 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1486 DEBUG(0,("getpeername failed. Error was %s\n",
1487 strerror(errno) ));
1488 return addr_buf;
1489 }
1490
1491 print_sockaddr_len(addr_buf,
1492 addr_buf_len,
1493 pss,
1494 *plength);
1495 return addr_buf;
1496 }
1497
1498 /*******************************************************************
1499 Matchname - determine if host name matches IP address. Used to
1500 confirm a hostname lookup to prevent spoof attacks.
1501 ******************************************************************/
1502
1503 static bool matchname(const char *remotehost,
1504 const struct sockaddr *pss,
1505 socklen_t len)
1506 {
1507 struct addrinfo *res = NULL;
1508 struct addrinfo *ailist = NULL;
1509 char addr_buf[INET6_ADDRSTRLEN];
1510 bool ret = interpret_string_addr_internal(&ailist,
1511 remotehost,
1512 AI_ADDRCONFIG|AI_CANONNAME);
1513
1514 if (!ret || ailist == NULL) {
1515 DEBUG(3,("matchname: getaddrinfo failed for "
1516 "name %s [%s]\n",
1517 remotehost,
1518 gai_strerror(ret) ));
1519 return false;
1520 }
1521
1522 /*
1523 * Make sure that getaddrinfo() returns the "correct" host name.
1524 */
1525
1526 if (ailist->ai_canonname == NULL ||
1527 (!strequal(remotehost, ailist->ai_canonname) &&
1528 !strequal(remotehost, "localhost"))) {
1529 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1530 remotehost,
1531 ailist->ai_canonname ?
1532 ailist->ai_canonname : "(NULL)"));
1533 freeaddrinfo(ailist);
1534 return false;
1535 }
1536
1537 /* Look up the host address in the address list we just got. */
1538 for (res = ailist; res; res = res->ai_next) {
1539 if (!res->ai_addr) {
1540 continue;
1541 }
1542 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1543 (struct sockaddr *)pss)) {
1544 freeaddrinfo(ailist);
1545 return true;
1546 }
1547 }
1548
1549 /*
1550 * The host name does not map to the original host address. Perhaps
1551 * someone has compromised a name server. More likely someone botched
1552 * it, but that could be dangerous, too.
1553 */
1554
1555 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1556 print_sockaddr_len(addr_buf,
1557 sizeof(addr_buf),
1558 pss,
1559 len),
1560 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1561
1562 if (ailist) {
1563 freeaddrinfo(ailist);
1564 }
1565 return false;
1566 }
1567
1568 /*******************************************************************
1569 Deal with the singleton cache.
1570 ******************************************************************/
1571
1572 struct name_addr_pair {
1573 struct sockaddr_storage ss;
1574 const char *name;
1575 };
1576
1577 /*******************************************************************
1578 Lookup a name/addr pair. Returns memory allocated from memcache.
1579 ******************************************************************/
1580
1581 static bool lookup_nc(struct name_addr_pair *nc)
1582 {
1583 DATA_BLOB tmp;
1584
1585 ZERO_STRUCTP(nc);
1586
1587 if (!memcache_lookup(
1588 NULL, SINGLETON_CACHE,
1589 data_blob_string_const_null("get_peer_name"),
1590 &tmp)) {
1591 return false;
1592 }
1593
1594 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1595 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1596 return true;
1597 }
1598
1599 /*******************************************************************
1600 Save a name/addr pair.
1601 ******************************************************************/
1602
1603 static void store_nc(const struct name_addr_pair *nc)
1604 {
1605 DATA_BLOB tmp;
1606 size_t namelen = strlen(nc->name);
1607
1608 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1609 if (!tmp.data) {
1610 return;
1611 }
1612 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1613 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1614
1615 memcache_add(NULL, SINGLETON_CACHE,
1616 data_blob_string_const_null("get_peer_name"),
1617 tmp);
1618 data_blob_free(&tmp);
1619 }
1620
1621 /*******************************************************************
1622 Return the DNS name of the remote end of a socket.
1623 ******************************************************************/
1624
1625 const char *get_peer_name(int fd, bool force_lookup)
1626 {
1627 struct name_addr_pair nc;
1628 char addr_buf[INET6_ADDRSTRLEN];
1629 struct sockaddr_storage ss;
1630 socklen_t length = sizeof(ss);
1631 const char *p;
1632 int ret;
1633 char name_buf[MAX_DNS_NAME_LENGTH];
1634 char tmp_name[MAX_DNS_NAME_LENGTH];
1635
1636 /* reverse lookups can be *very* expensive, and in many
1637 situations won't work because many networks don't link dhcp
1638 with dns. To avoid the delay we avoid the lookup if
1639 possible */
1640 if (!lp_hostname_lookups() && (force_lookup == false)) {
1641 length = sizeof(nc.ss);
1642 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1643 (struct sockaddr *)&nc.ss, &length);
1644 store_nc(&nc);
1645 lookup_nc(&nc);
1646 return nc.name ? nc.name : "UNKNOWN";
1647 }
1648
1649 lookup_nc(&nc);
1650
1651 memset(&ss, '\0', sizeof(ss));
1652 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1653
1654 /* it might be the same as the last one - save some DNS work */
1655 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1656 return nc.name ? nc.name : "UNKNOWN";
1657 }
1658
1659 /* Not the same. We need to lookup. */
1660 if (fd == -1) {
1661 return "UNKNOWN";
1662 }
1663
1664 /* Look up the remote host name. */
1665 ret = sys_getnameinfo((struct sockaddr *)&ss,
1666 length,
1667 name_buf,
1668 sizeof(name_buf),
1669 NULL,
1670 0,
1671 0);
1672
1673 if (ret) {
1674 DEBUG(1,("get_peer_name: getnameinfo failed "
1675 "for %s with error %s\n",
1676 p,
1677 gai_strerror(ret)));
1678 strlcpy(name_buf, p, sizeof(name_buf));
1679 } else {
1680 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1681 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1682 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1683 }
1684 }
1685
1686 /* can't pass the same source and dest strings in when you
1687 use --enable-developer or the clobber_region() call will
1688 get you */
1689
1690 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1691 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1692 if (strstr(name_buf,"..")) {
1693 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1694 }
1695
1696 nc.name = name_buf;
1697 nc.ss = ss;
1698
1699 store_nc(&nc);
1700 lookup_nc(&nc);
1701 return nc.name ? nc.name : "UNKNOWN";
1702 }
1703
1704 /*******************************************************************
1705 Return the IP addr of the remote end of a socket as a string.
1706 ******************************************************************/
1707
1708 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1709 {
1710 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1711 }
1712
1713 /*******************************************************************
1714 Create protected unix domain socket.
1715
1716 Some unixes cannot set permissions on a ux-dom-sock, so we
1717 have to make sure that the directory contains the protection
1718 permissions instead.
1719 ******************************************************************/
1720
1721 int create_pipe_sock(const char *socket_dir,
1722 const char *socket_name,
1723 mode_t dir_perms)
1724 {
1725 #ifdef HAVE_UNIXSOCKET
1726 struct sockaddr_un sunaddr;
1727 struct stat st;
1728 int sock;
1729 mode_t old_umask;
1730 char *path = NULL;
1731
1732 old_umask = umask(0);
1733
1734 /* Create the socket directory or reuse the existing one */
1735
1736 if (lstat(socket_dir, &st) == -1) {
1737 if (errno == ENOENT) {
1738 /* Create directory */
1739 if (mkdir(socket_dir, dir_perms) == -1) {
1740 DEBUG(0, ("error creating socket directory "
1741 "%s: %s\n", socket_dir,
1742 strerror(errno)));
1743 goto out_umask;
1744 }
1745 } else {
1746 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1747 socket_dir, strerror(errno)));
1748 goto out_umask;
1749 }
1750 } else {
1751 /* Check ownership and permission on existing directory */
1752 if (!S_ISDIR(st.st_mode)) {
1753 DEBUG(0, ("socket directory %s isn't a directory\n",
1754 socket_dir));
1755 goto out_umask;
1756 }
1757 if ((st.st_uid != sec_initial_uid()) ||
1758 ((st.st_mode & 0777) != dir_perms)) {
1759 DEBUG(0, ("invalid permissions on socket directory "
1760 "%s\n", socket_dir));
1761 goto out_umask;
1762 }
1763 }
1764
1765 /* Create the socket file */
1766
1767 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1768
1769 if (sock == -1) {
1770 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1771 strerror(errno) ));
1772 goto out_close;
1773 }
1774
1775 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1776 goto out_close;
1777 }
1778
1779 unlink(path);
1780 memset(&sunaddr, 0, sizeof(sunaddr));
1781 sunaddr.sun_family = AF_UNIX;
1782 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1783
1784 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1785 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1786 strerror(errno)));
1787 goto out_close;
1788 }
1789
1790 if (listen(sock, 5) == -1) {
1791 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1792 strerror(errno)));
1793 goto out_close;
1794 }
1795
1796 SAFE_FREE(path);
1797
1798 umask(old_umask);
1799 return sock;
1800
1801 out_close:
1802 SAFE_FREE(path);
1803 if (sock != -1)
1804 close(sock);
1805
1806 out_umask:
1807 umask(old_umask);
1808 return -1;
1809
1810 #else
1811 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1812 return -1;
1813 #endif /* HAVE_UNIXSOCKET */
1814 }
1815
1816 /****************************************************************************
1817 Get my own canonical name, including domain.
1818 ****************************************************************************/
1819
1820 const char *get_mydnsfullname(void)
1821 {
1822 struct addrinfo *res = NULL;
1823 char my_hostname[HOST_NAME_MAX];
1824 bool ret;
1825 DATA_BLOB tmp;
1826
1827 if (memcache_lookup(NULL, SINGLETON_CACHE,
1828 data_blob_string_const_null("get_mydnsfullname"),
1829 &tmp)) {
1830 SMB_ASSERT(tmp.length > 0);
1831 return (const char *)tmp.data;
1832 }
1833
1834 /* get my host name */
1835 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1836 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1837 return NULL;
1838 }
1839
1840 /* Ensure null termination. */
1841 my_hostname[sizeof(my_hostname)-1] = '\0';
1842
1843 ret = interpret_string_addr_internal(&res,
1844 my_hostname,
1845 AI_ADDRCONFIG|AI_CANONNAME);
1846
1847 if (!ret || res == NULL) {
1848 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1849 "name %s [%s]\n",
1850 my_hostname,
1851 gai_strerror(ret) ));
1852 return NULL;
1853 }
1854
1855 /*
1856 * Make sure that getaddrinfo() returns the "correct" host name.
1857 */
1858
1859 if (res->ai_canonname == NULL) {
1860 DEBUG(3,("get_mydnsfullname: failed to get "
1861 "canonical name for %s\n",
1862 my_hostname));
1863 freeaddrinfo(res);
1864 return NULL;
1865 }
1866
1867 /* This copies the data, so we must do a lookup
1868 * afterwards to find the value to return.
1869 */
1870
1871 memcache_add(NULL, SINGLETON_CACHE,
1872 data_blob_string_const_null("get_mydnsfullname"),
1873 data_blob_string_const_null(res->ai_canonname));
1874
1875 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1876 data_blob_string_const_null("get_mydnsfullname"),
1877 &tmp)) {
1878 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1879 strlen(res->ai_canonname) + 1);
1880 }
1881
1882 freeaddrinfo(res);
1883
1884 return (const char *)tmp.data;
1885 }
1886
1887 /************************************************************
1888 Is this my name ?
1889 ************************************************************/
1890
1891 bool is_myname_or_ipaddr(const char *s)
1892 {
1893 TALLOC_CTX *ctx = talloc_tos();
1894 char addr[INET6_ADDRSTRLEN];
1895 char *name = NULL;
1896 const char *dnsname;
1897 char *servername = NULL;
1898
1899 if (!s) {
1900 return false;
1901 }
1902
1903 /* Santize the string from '\\name' */
1904 name = talloc_strdup(ctx, s);
1905 if (!name) {
1906 return false;
1907 }
1908
1909 servername = strrchr_m(name, '\\' );
1910 if (!servername) {
1911 servername = name;
1912 } else {
1913 servername++;
1914 }
1915
1916 /* Optimize for the common case */
1917 if (strequal(servername, global_myname())) {
1918 return true;
1919 }
1920
1921 /* Check for an alias */
1922 if (is_myname(servername)) {
1923 return true;
1924 }
1925
1926 /* Check for loopback */
1927 if (strequal(servername, "127.0.0.1") ||
1928 strequal(servername, "::1")) {
1929 return true;
1930 }
1931
1932 if (strequal(servername, "localhost")) {
1933 return true;
1934 }
1935
1936 /* Maybe it's my dns name */
1937 dnsname = get_mydnsfullname();
1938 if (dnsname && strequal(servername, dnsname)) {
1939 return true;
1940 }
1941
1942 /* Handle possible CNAME records - convert to an IP addr. */
1943 if (!is_ipaddress(servername)) {
1944 /* Use DNS to resolve the name, but only the first address */
1945 struct sockaddr_storage ss;
1946 if (interpret_string_addr(&ss, servername, 0)) {
1947 print_sockaddr(addr,
1948 sizeof(addr),
1949 &ss);
1950 servername = addr;
1951 }
1952 }
1953
1954 /* Maybe its an IP address? */
1955 if (is_ipaddress(servername)) {
1956 struct sockaddr_storage ss;
1957 struct iface_struct *nics;
1958 int i, n;
1959
1960 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1961 return false;
1962 }
1963
1964 if (ismyaddr((struct sockaddr *)&ss)) {
1965 return true;
1966 }
1967
1968 if (is_zero_addr((struct sockaddr *)&ss) ||
1969 is_loopback_addr((struct sockaddr *)&ss)) {
1970 return false;
1971 }
1972
1973 n = get_interfaces(talloc_tos(), &nics);
1974 for (i=0; i<n; i++) {
1975 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1976 TALLOC_FREE(nics);
1977 return true;
1978 }
1979 }
1980 TALLOC_FREE(nics);
1981 }
1982
1983 /* No match */
1984 return false;
1985 }
1986
1987 struct getaddrinfo_state {
1988 const char *node;
1989 const char *service;
1990 const struct addrinfo *hints;
1991 struct addrinfo *res;
1992 int ret;
1993 };
1994
1995 static void getaddrinfo_do(void *private_data);
1996 static void getaddrinfo_done(struct tevent_req *subreq);
1997
1998 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
1999 struct tevent_context *ev,
2000 struct fncall_context *ctx,
2001 const char *node,
2002 const char *service,
2003 const struct addrinfo *hints)
2004 {
2005 struct tevent_req *req, *subreq;
2006 struct getaddrinfo_state *state;
2007
2008 req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
2009 if (req == NULL) {
2010 return NULL;
2011 }
2012
2013 state->node = node;
2014 state->service = service;
2015 state->hints = hints;
2016
2017 subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
2018 if (tevent_req_nomem(subreq, req)) {
2019 return tevent_req_post(req, ev);
2020 }
2021 tevent_req_set_callback(subreq, getaddrinfo_done, req);
2022 return req;
2023 }
2024
2025 static void getaddrinfo_do(void *private_data)
2026 {
2027 struct getaddrinfo_state *state =
2028 (struct getaddrinfo_state *)private_data;
2029
2030 state->ret = getaddrinfo(state->node, state->service, state->hints,
2031 &state->res);
2032 }
2033
2034 static void getaddrinfo_done(struct tevent_req *subreq)
2035 {
2036 struct tevent_req *req = tevent_req_callback_data(
2037 subreq, struct tevent_req);
2038 int ret, err;
2039
2040 ret = fncall_recv(subreq, &err);
2041 TALLOC_FREE(subreq);
2042 if (ret == -1) {
2043 tevent_req_error(req, err);
2044 return;
2045 }
2046 tevent_req_done(req);
2047 }
2048
2049 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
2050 {
2051 struct getaddrinfo_state *state = tevent_req_data(
2052 req, struct getaddrinfo_state);
2053 int err;
2054
2055 if (tevent_req_is_unix_error(req, &err)) {
2056 switch(err) {
2057 case ENOMEM:
2058 return EAI_MEMORY;
2059 default:
2060 return EAI_FAIL;
2061 }
2062 }
2063 if (state->ret == 0) {
2064 *res = state->res;
2065 }
2066 return state->ret;
2067 }
reg import