6e75a67a85b41ac8f3a6c9f055aa80d19a62cdf2
[kai/samba-autobuild/.git] / source3 / lib / util_sock.c
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 #if 0
212 /* Not currently used. JRA. */
213 /****************************************************************************
214  Return the port number we've bound to on a socket.
215 ****************************************************************************/
216
217 static int get_socket_port(int fd)
218 {
219         struct sockaddr_storage sa;
220         socklen_t length = sizeof(sa);
221
222         if (fd == -1) {
223                 return -1;
224         }
225
226         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
227                 DEBUG(0,("getpeername failed. Error was %s\n",
228                         strerror(errno) ));
229                 return -1;
230         }
231
232 #if defined(HAVE_IPV6)
233         if (sa.ss_family == AF_INET6) {
234                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
235         }
236 #endif
237         if (sa.ss_family == AF_INET) {
238                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
239         }
240         return -1;
241 }
242 #endif
243
244 const char *client_name(int fd)
245 {
246         return get_peer_name(fd,false);
247 }
248
249 const char *client_addr(int fd, char *addr, size_t addrlen)
250 {
251         return get_peer_addr(fd,addr,addrlen);
252 }
253
254 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
255 {
256         return get_socket_addr(fd, addr, addr_len);
257 }
258
259 #if 0
260 /* Not currently used. JRA. */
261 int client_socket_port(int fd)
262 {
263         return get_socket_port(fd);
264 }
265 #endif
266
267 /****************************************************************************
268  Accessor functions to make thread-safe code easier later...
269 ****************************************************************************/
270
271 void set_smb_read_error(enum smb_read_errors *pre,
272                         enum smb_read_errors newerr)
273 {
274         if (pre) {
275                 *pre = newerr;
276         }
277 }
278
279 void cond_set_smb_read_error(enum smb_read_errors *pre,
280                         enum smb_read_errors newerr)
281 {
282         if (pre && *pre == SMB_READ_OK) {
283                 *pre = newerr;
284         }
285 }
286
287 /****************************************************************************
288  Determine if a file descriptor is in fact a socket.
289 ****************************************************************************/
290
291 bool is_a_socket(int fd)
292 {
293         int v;
294         socklen_t l;
295         l = sizeof(int);
296         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
297 }
298
299 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
300
301 typedef struct smb_socket_option {
302         const char *name;
303         int level;
304         int option;
305         int value;
306         int opttype;
307 } smb_socket_option;
308
309 static const smb_socket_option socket_options[] = {
310   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
311   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
312   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
313 #ifdef TCP_NODELAY
314   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
315 #endif
316 #ifdef TCP_KEEPCNT
317   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
318 #endif
319 #ifdef TCP_KEEPIDLE
320   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
321 #endif
322 #ifdef TCP_KEEPINTVL
323   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
324 #endif
325 #ifdef IPTOS_LOWDELAY
326   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
327 #endif
328 #ifdef IPTOS_THROUGHPUT
329   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
330 #endif
331 #ifdef SO_REUSEPORT
332   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
333 #endif
334 #ifdef SO_SNDBUF
335   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
336 #endif
337 #ifdef SO_RCVBUF
338   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
339 #endif
340 #ifdef SO_SNDLOWAT
341   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
342 #endif
343 #ifdef SO_RCVLOWAT
344   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
345 #endif
346 #ifdef SO_SNDTIMEO
347   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
348 #endif
349 #ifdef SO_RCVTIMEO
350   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
351 #endif
352 #ifdef TCP_FASTACK
353   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
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_read(fd, buf + nread, maxcnt - nread);
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_read(fd, buf+nread, maxcnt-nread);
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 = 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(char *, 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         print_sockaddr(addr, sizeof(addr), &state->ss);
1025         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1026
1027         subreq = async_connect_send(state, state->ev, state->fd,
1028                                     (struct sockaddr *)&state->ss,
1029                                     state->salen);
1030         if ((subreq == NULL)
1031             || !tevent_req_set_endtime(
1032                     subreq, state->ev,
1033                     timeval_current_ofs(0, state->wait_nsec))) {
1034                 goto fail;
1035         }
1036         subreq->async.fn = open_socket_out_connected;
1037         subreq->async.private_data = result;
1038         return result;
1039
1040  post_status:
1041         tevent_req_nterror(result, status);
1042         return tevent_req_post(result, ev);
1043  fail:
1044         TALLOC_FREE(result);
1045         return NULL;
1046 }
1047
1048 static void open_socket_out_connected(struct tevent_req *subreq)
1049 {
1050         struct tevent_req *req = talloc_get_type_abort(
1051                 subreq->async.private_data, struct tevent_req);
1052         struct open_socket_out_state *state = talloc_get_type_abort(
1053                 req->private_state, struct open_socket_out_state);
1054         int ret;
1055         int sys_errno;
1056
1057         ret = async_connect_recv(subreq, &sys_errno);
1058         TALLOC_FREE(subreq);
1059         if (ret == 0) {
1060                 tevent_req_done(req);
1061                 return;
1062         }
1063
1064         if (
1065 #ifdef ETIMEDOUT
1066                 (sys_errno == ETIMEDOUT) ||
1067 #endif
1068                 (sys_errno == EINPROGRESS) ||
1069                 (sys_errno == EALREADY) ||
1070                 (sys_errno == EAGAIN)) {
1071
1072                 /*
1073                  * retry
1074                  */
1075
1076                 if (state->wait_nsec < 250000) {
1077                         state->wait_nsec *= 1.5;
1078                 }
1079
1080                 subreq = async_connect_send(state, state->ev, state->fd,
1081                                             (struct sockaddr *)&state->ss,
1082                                             state->salen);
1083                 if (tevent_req_nomem(subreq, req)) {
1084                         return;
1085                 }
1086                 if (!tevent_req_set_endtime(
1087                             subreq, state->ev,
1088                             timeval_current_ofs(0, state->wait_nsec))) {
1089                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1090                         return;
1091                 }
1092                 subreq->async.fn = open_socket_out_connected;
1093                 subreq->async.private_data = req;
1094                 return;
1095         }
1096
1097 #ifdef EISCONN
1098         if (sys_errno == EISCONN) {
1099                 tevent_req_done(req);
1100                 return;
1101         }
1102 #endif
1103
1104         /* real error */
1105         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1106 }
1107
1108 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1109 {
1110         struct open_socket_out_state *state = talloc_get_type_abort(
1111                 req->private_state, struct open_socket_out_state);
1112         NTSTATUS status;
1113
1114         if (tevent_req_is_nterror(req, &status)) {
1115                 return status;
1116         }
1117         *pfd = state->fd;
1118         state->fd = -1;
1119         return NT_STATUS_OK;
1120 }
1121
1122 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1123                          int timeout, int *pfd)
1124 {
1125         TALLOC_CTX *frame = talloc_stackframe();
1126         struct event_context *ev;
1127         struct tevent_req *req;
1128         NTSTATUS status = NT_STATUS_NO_MEMORY;
1129
1130         ev = event_context_init(frame);
1131         if (ev == NULL) {
1132                 goto fail;
1133         }
1134
1135         req = open_socket_out_send(frame, ev, pss, port, timeout);
1136         if (req == NULL) {
1137                 goto fail;
1138         }
1139         if (!tevent_req_poll(req, ev)) {
1140                 status = NT_STATUS_INTERNAL_ERROR;
1141                 goto fail;
1142         }
1143         status = open_socket_out_recv(req, pfd);
1144  fail:
1145         TALLOC_FREE(frame);
1146         return status;
1147 }
1148
1149 struct open_socket_out_defer_state {
1150         struct event_context *ev;
1151         struct sockaddr_storage ss;
1152         uint16_t port;
1153         int timeout;
1154         int fd;
1155 };
1156
1157 static void open_socket_out_defer_waited(struct async_req *subreq);
1158 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1159
1160 struct async_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1161                                              struct event_context *ev,
1162                                              struct timeval wait_time,
1163                                              const struct sockaddr_storage *pss,
1164                                              uint16_t port,
1165                                              int timeout)
1166 {
1167         struct async_req *result, *subreq;
1168         struct open_socket_out_defer_state *state;
1169         NTSTATUS status;
1170
1171         if (!async_req_setup(mem_ctx, &result, &state,
1172                              struct open_socket_out_defer_state)) {
1173                 return NULL;
1174         }
1175         state->ev = ev;
1176         state->ss = *pss;
1177         state->port = port;
1178         state->timeout = timeout;
1179
1180         subreq = async_wait_send(state, ev, wait_time);
1181         if (subreq == NULL) {
1182                 status = NT_STATUS_NO_MEMORY;
1183                 goto post_status;
1184         }
1185         subreq->async.fn = open_socket_out_defer_waited;
1186         subreq->async.priv = result;
1187         return result;
1188
1189  post_status:
1190         if (!async_post_ntstatus(result, ev, status)) {
1191                 goto fail;
1192         }
1193         return result;
1194  fail:
1195         TALLOC_FREE(result);
1196         return NULL;
1197 }
1198
1199 static void open_socket_out_defer_waited(struct async_req *subreq)
1200 {
1201         struct async_req *req = talloc_get_type_abort(
1202                 subreq->async.priv, struct async_req);
1203         struct open_socket_out_defer_state *state = talloc_get_type_abort(
1204                 req->private_data, struct open_socket_out_defer_state);
1205         struct tevent_req *subreq2;
1206         bool ret;
1207
1208         ret = async_wait_recv(subreq);
1209         TALLOC_FREE(subreq);
1210         if (!ret) {
1211                 async_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1212                 return;
1213         }
1214
1215         subreq2 = open_socket_out_send(state, state->ev, &state->ss,
1216                                        state->port, state->timeout);
1217         if (async_req_nomem(subreq2, req)) {
1218                 return;
1219         }
1220         subreq2->async.fn = open_socket_out_defer_connected;
1221         subreq2->async.private_data = req;
1222 }
1223
1224 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1225 {
1226         struct async_req *req = talloc_get_type_abort(
1227                 subreq->async.private_data, struct async_req);
1228         struct open_socket_out_defer_state *state = talloc_get_type_abort(
1229                 req->private_data, struct open_socket_out_defer_state);
1230         NTSTATUS status;
1231
1232         status = open_socket_out_recv(subreq, &state->fd);
1233         TALLOC_FREE(subreq);
1234         if (!NT_STATUS_IS_OK(status)) {
1235                 async_req_nterror(req, status);
1236                 return;
1237         }
1238         async_req_done(req);
1239 }
1240
1241 NTSTATUS open_socket_out_defer_recv(struct async_req *req, int *pfd)
1242 {
1243         struct open_socket_out_defer_state *state = talloc_get_type_abort(
1244                 req->private_data, struct open_socket_out_defer_state);
1245         NTSTATUS status;
1246
1247         if (async_req_is_nterror(req, &status)) {
1248                 return status;
1249         }
1250         *pfd = state->fd;
1251         state->fd = -1;
1252         return NT_STATUS_OK;
1253 }
1254
1255 /*******************************************************************
1256  Create an outgoing TCP socket to the first addr that connects.
1257
1258  This is for simultaneous connection attempts to port 445 and 139 of a host
1259  or for simultatneous connection attempts to multiple DCs at once.  We return
1260  a socket fd of the first successful connection.
1261
1262  @param[in] addrs list of Internet addresses and ports to connect to
1263  @param[in] num_addrs number of address/port pairs in the addrs list
1264  @param[in] timeout time after which we stop waiting for a socket connection
1265             to succeed, given in milliseconds
1266  @param[out] fd_index the entry in addrs which we successfully connected to
1267  @param[out] fd fd of the open and connected socket
1268  @return true on a successful connection, false if all connection attempts
1269          failed or we timed out
1270 *******************************************************************/
1271
1272 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1273                          int timeout, int *fd_index, int *fd)
1274 {
1275         int i, resulting_index, res;
1276         int *sockets;
1277         bool good_connect;
1278
1279         fd_set r_fds, wr_fds;
1280         struct timeval tv;
1281         int maxfd;
1282
1283         int connect_loop = 10000; /* 10 milliseconds */
1284
1285         timeout *= 1000;        /* convert to microseconds */
1286
1287         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1288
1289         if (sockets == NULL)
1290                 return false;
1291
1292         resulting_index = -1;
1293
1294         for (i=0; i<num_addrs; i++)
1295                 sockets[i] = -1;
1296
1297         for (i=0; i<num_addrs; i++) {
1298                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1299                 if (sockets[i] < 0)
1300                         goto done;
1301                 set_blocking(sockets[i], false);
1302         }
1303
1304  connect_again:
1305         good_connect = false;
1306
1307         for (i=0; i<num_addrs; i++) {
1308                 const struct sockaddr * a = 
1309                     (const struct sockaddr *)&(addrs[i]);
1310
1311                 if (sockets[i] == -1)
1312                         continue;
1313
1314                 if (sys_connect(sockets[i], a) == 0) {
1315                         /* Rather unlikely as we are non-blocking, but it
1316                          * might actually happen. */
1317                         resulting_index = i;
1318                         goto done;
1319                 }
1320
1321                 if (errno == EINPROGRESS || errno == EALREADY ||
1322 #ifdef EISCONN
1323                         errno == EISCONN ||
1324 #endif
1325                     errno == EAGAIN || errno == EINTR) {
1326                         /* These are the error messages that something is
1327                            progressing. */
1328                         good_connect = true;
1329                 } else if (errno != 0) {
1330                         /* There was a direct error */
1331                         close(sockets[i]);
1332                         sockets[i] = -1;
1333                 }
1334         }
1335
1336         if (!good_connect) {
1337                 /* All of the connect's resulted in real error conditions */
1338                 goto done;
1339         }
1340
1341         /* Lets see if any of the connect attempts succeeded */
1342
1343         maxfd = 0;
1344         FD_ZERO(&wr_fds);
1345         FD_ZERO(&r_fds);
1346
1347         for (i=0; i<num_addrs; i++) {
1348                 if (sockets[i] == -1)
1349                         continue;
1350                 FD_SET(sockets[i], &wr_fds);
1351                 FD_SET(sockets[i], &r_fds);
1352                 if (sockets[i]>maxfd)
1353                         maxfd = sockets[i];
1354         }
1355
1356         tv.tv_sec = 0;
1357         tv.tv_usec = connect_loop;
1358
1359         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1360
1361         if (res < 0)
1362                 goto done;
1363
1364         if (res == 0)
1365                 goto next_round;
1366
1367         for (i=0; i<num_addrs; i++) {
1368
1369                 if (sockets[i] == -1)
1370                         continue;
1371
1372                 /* Stevens, Network Programming says that if there's a
1373                  * successful connect, the socket is only writable. Upon an
1374                  * error, it's both readable and writable. */
1375
1376                 if (FD_ISSET(sockets[i], &r_fds) &&
1377                     FD_ISSET(sockets[i], &wr_fds)) {
1378                         /* readable and writable, so it's an error */
1379                         close(sockets[i]);
1380                         sockets[i] = -1;
1381                         continue;
1382                 }
1383
1384                 if (!FD_ISSET(sockets[i], &r_fds) &&
1385                     FD_ISSET(sockets[i], &wr_fds)) {
1386                         /* Only writable, so it's connected */
1387                         resulting_index = i;
1388                         goto done;
1389                 }
1390         }
1391
1392  next_round:
1393
1394         timeout -= connect_loop;
1395         if (timeout <= 0)
1396                 goto done;
1397         connect_loop *= 1.5;
1398         if (connect_loop > timeout)
1399                 connect_loop = timeout;
1400         goto connect_again;
1401
1402  done:
1403         for (i=0; i<num_addrs; i++) {
1404                 if (i == resulting_index)
1405                         continue;
1406                 if (sockets[i] >= 0)
1407                         close(sockets[i]);
1408         }
1409
1410         if (resulting_index >= 0) {
1411                 *fd_index = resulting_index;
1412                 *fd = sockets[*fd_index];
1413                 set_blocking(*fd, true);
1414         }
1415
1416         free(sockets);
1417
1418         return (resulting_index >= 0);
1419 }
1420 /****************************************************************************
1421  Open a connected UDP socket to host on port
1422 **************************************************************************/
1423
1424 int open_udp_socket(const char *host, int port)
1425 {
1426         int type = SOCK_DGRAM;
1427         struct sockaddr_in sock_out;
1428         int res;
1429         struct in_addr addr;
1430
1431         addr = interpret_addr2(host);
1432
1433         res = socket(PF_INET, type, 0);
1434         if (res == -1) {
1435                 return -1;
1436         }
1437
1438         memset((char *)&sock_out,'\0',sizeof(sock_out));
1439         putip((char *)&sock_out.sin_addr,(char *)&addr);
1440         sock_out.sin_port = htons(port);
1441         sock_out.sin_family = PF_INET;
1442
1443         if (sys_connect(res,(struct sockaddr *)&sock_out)) {
1444                 close(res);
1445                 return -1;
1446         }
1447
1448         return res;
1449 }
1450
1451 /*******************************************************************
1452  Return the IP addr of the remote end of a socket as a string.
1453  Optionally return the struct sockaddr_storage.
1454  ******************************************************************/
1455
1456 static const char *get_peer_addr_internal(int fd,
1457                                 char *addr_buf,
1458                                 size_t addr_buf_len,
1459                                 struct sockaddr *pss,
1460                                 socklen_t *plength)
1461 {
1462         struct sockaddr_storage ss;
1463         socklen_t length = sizeof(ss);
1464
1465         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1466
1467         if (fd == -1) {
1468                 return addr_buf;
1469         }
1470
1471         if (pss == NULL) {
1472                 pss = (struct sockaddr *)&ss;
1473                 plength = &length;
1474         }
1475
1476         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1477                 DEBUG(0,("getpeername failed. Error was %s\n",
1478                                         strerror(errno) ));
1479                 return addr_buf;
1480         }
1481
1482         print_sockaddr_len(addr_buf,
1483                         addr_buf_len,
1484                         pss,
1485                         *plength);
1486         return addr_buf;
1487 }
1488
1489 /*******************************************************************
1490  Matchname - determine if host name matches IP address. Used to
1491  confirm a hostname lookup to prevent spoof attacks.
1492 ******************************************************************/
1493
1494 static bool matchname(const char *remotehost,
1495                 const struct sockaddr *pss,
1496                 socklen_t len)
1497 {
1498         struct addrinfo *res = NULL;
1499         struct addrinfo *ailist = NULL;
1500         char addr_buf[INET6_ADDRSTRLEN];
1501         bool ret = interpret_string_addr_internal(&ailist,
1502                         remotehost,
1503                         AI_ADDRCONFIG|AI_CANONNAME);
1504
1505         if (!ret || ailist == NULL) {
1506                 DEBUG(3,("matchname: getaddrinfo failed for "
1507                         "name %s [%s]\n",
1508                         remotehost,
1509                         gai_strerror(ret) ));
1510                 return false;
1511         }
1512
1513         /*
1514          * Make sure that getaddrinfo() returns the "correct" host name.
1515          */
1516
1517         if (ailist->ai_canonname == NULL ||
1518                 (!strequal(remotehost, ailist->ai_canonname) &&
1519                  !strequal(remotehost, "localhost"))) {
1520                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1521                          remotehost,
1522                          ailist->ai_canonname ?
1523                                  ailist->ai_canonname : "(NULL)"));
1524                 freeaddrinfo(ailist);
1525                 return false;
1526         }
1527
1528         /* Look up the host address in the address list we just got. */
1529         for (res = ailist; res; res = res->ai_next) {
1530                 if (!res->ai_addr) {
1531                         continue;
1532                 }
1533                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1534                                         (struct sockaddr *)pss)) {
1535                         freeaddrinfo(ailist);
1536                         return true;
1537                 }
1538         }
1539
1540         /*
1541          * The host name does not map to the original host address. Perhaps
1542          * someone has compromised a name server. More likely someone botched
1543          * it, but that could be dangerous, too.
1544          */
1545
1546         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1547                 print_sockaddr_len(addr_buf,
1548                         sizeof(addr_buf),
1549                         pss,
1550                         len),
1551                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1552
1553         if (ailist) {
1554                 freeaddrinfo(ailist);
1555         }
1556         return false;
1557 }
1558
1559 /*******************************************************************
1560  Deal with the singleton cache.
1561 ******************************************************************/
1562
1563 struct name_addr_pair {
1564         struct sockaddr_storage ss;
1565         const char *name;
1566 };
1567
1568 /*******************************************************************
1569  Lookup a name/addr pair. Returns memory allocated from memcache.
1570 ******************************************************************/
1571
1572 static bool lookup_nc(struct name_addr_pair *nc)
1573 {
1574         DATA_BLOB tmp;
1575
1576         ZERO_STRUCTP(nc);
1577
1578         if (!memcache_lookup(
1579                         NULL, SINGLETON_CACHE,
1580                         data_blob_string_const_null("get_peer_name"),
1581                         &tmp)) {
1582                 return false;
1583         }
1584
1585         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1586         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1587         return true;
1588 }
1589
1590 /*******************************************************************
1591  Save a name/addr pair.
1592 ******************************************************************/
1593
1594 static void store_nc(const struct name_addr_pair *nc)
1595 {
1596         DATA_BLOB tmp;
1597         size_t namelen = strlen(nc->name);
1598
1599         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1600         if (!tmp.data) {
1601                 return;
1602         }
1603         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1604         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1605
1606         memcache_add(NULL, SINGLETON_CACHE,
1607                         data_blob_string_const_null("get_peer_name"),
1608                         tmp);
1609         data_blob_free(&tmp);
1610 }
1611
1612 /*******************************************************************
1613  Return the DNS name of the remote end of a socket.
1614 ******************************************************************/
1615
1616 const char *get_peer_name(int fd, bool force_lookup)
1617 {
1618         struct name_addr_pair nc;
1619         char addr_buf[INET6_ADDRSTRLEN];
1620         struct sockaddr_storage ss;
1621         socklen_t length = sizeof(ss);
1622         const char *p;
1623         int ret;
1624         char name_buf[MAX_DNS_NAME_LENGTH];
1625         char tmp_name[MAX_DNS_NAME_LENGTH];
1626
1627         /* reverse lookups can be *very* expensive, and in many
1628            situations won't work because many networks don't link dhcp
1629            with dns. To avoid the delay we avoid the lookup if
1630            possible */
1631         if (!lp_hostname_lookups() && (force_lookup == false)) {
1632                 length = sizeof(nc.ss);
1633                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1634                         (struct sockaddr *)&nc.ss, &length);
1635                 store_nc(&nc);
1636                 lookup_nc(&nc);
1637                 return nc.name ? nc.name : "UNKNOWN";
1638         }
1639
1640         lookup_nc(&nc);
1641
1642         memset(&ss, '\0', sizeof(ss));
1643         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1644
1645         /* it might be the same as the last one - save some DNS work */
1646         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1647                 return nc.name ? nc.name : "UNKNOWN";
1648         }
1649
1650         /* Not the same. We need to lookup. */
1651         if (fd == -1) {
1652                 return "UNKNOWN";
1653         }
1654
1655         /* Look up the remote host name. */
1656         ret = sys_getnameinfo((struct sockaddr *)&ss,
1657                         length,
1658                         name_buf,
1659                         sizeof(name_buf),
1660                         NULL,
1661                         0,
1662                         0);
1663
1664         if (ret) {
1665                 DEBUG(1,("get_peer_name: getnameinfo failed "
1666                         "for %s with error %s\n",
1667                         p,
1668                         gai_strerror(ret)));
1669                 strlcpy(name_buf, p, sizeof(name_buf));
1670         } else {
1671                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1672                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1673                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1674                 }
1675         }
1676
1677         /* can't pass the same source and dest strings in when you
1678            use --enable-developer or the clobber_region() call will
1679            get you */
1680
1681         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1682         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1683         if (strstr(name_buf,"..")) {
1684                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1685         }
1686
1687         nc.name = name_buf;
1688         nc.ss = ss;
1689
1690         store_nc(&nc);
1691         lookup_nc(&nc);
1692         return nc.name ? nc.name : "UNKNOWN";
1693 }
1694
1695 /*******************************************************************
1696  Return the IP addr of the remote end of a socket as a string.
1697  ******************************************************************/
1698
1699 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1700 {
1701         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1702 }
1703
1704 /*******************************************************************
1705  Create protected unix domain socket.
1706
1707  Some unixes cannot set permissions on a ux-dom-sock, so we
1708  have to make sure that the directory contains the protection
1709  permissions instead.
1710  ******************************************************************/
1711
1712 int create_pipe_sock(const char *socket_dir,
1713                      const char *socket_name,
1714                      mode_t dir_perms)
1715 {
1716 #ifdef HAVE_UNIXSOCKET
1717         struct sockaddr_un sunaddr;
1718         struct stat st;
1719         int sock;
1720         mode_t old_umask;
1721         char *path = NULL;
1722
1723         old_umask = umask(0);
1724
1725         /* Create the socket directory or reuse the existing one */
1726
1727         if (lstat(socket_dir, &st) == -1) {
1728                 if (errno == ENOENT) {
1729                         /* Create directory */
1730                         if (mkdir(socket_dir, dir_perms) == -1) {
1731                                 DEBUG(0, ("error creating socket directory "
1732                                         "%s: %s\n", socket_dir,
1733                                         strerror(errno)));
1734                                 goto out_umask;
1735                         }
1736                 } else {
1737                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1738                                 socket_dir, strerror(errno)));
1739                         goto out_umask;
1740                 }
1741         } else {
1742                 /* Check ownership and permission on existing directory */
1743                 if (!S_ISDIR(st.st_mode)) {
1744                         DEBUG(0, ("socket directory %s isn't a directory\n",
1745                                 socket_dir));
1746                         goto out_umask;
1747                 }
1748                 if ((st.st_uid != sec_initial_uid()) ||
1749                                 ((st.st_mode & 0777) != dir_perms)) {
1750                         DEBUG(0, ("invalid permissions on socket directory "
1751                                 "%s\n", socket_dir));
1752                         goto out_umask;
1753                 }
1754         }
1755
1756         /* Create the socket file */
1757
1758         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1759
1760         if (sock == -1) {
1761                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1762                         strerror(errno) ));
1763                 goto out_close;
1764         }
1765
1766         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1767                 goto out_close;
1768         }
1769
1770         unlink(path);
1771         memset(&sunaddr, 0, sizeof(sunaddr));
1772         sunaddr.sun_family = AF_UNIX;
1773         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1774
1775         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1776                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1777                         strerror(errno)));
1778                 goto out_close;
1779         }
1780
1781         if (listen(sock, 5) == -1) {
1782                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1783                         strerror(errno)));
1784                 goto out_close;
1785         }
1786
1787         SAFE_FREE(path);
1788
1789         umask(old_umask);
1790         return sock;
1791
1792 out_close:
1793         SAFE_FREE(path);
1794         if (sock != -1)
1795                 close(sock);
1796
1797 out_umask:
1798         umask(old_umask);
1799         return -1;
1800
1801 #else
1802         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1803         return -1;
1804 #endif /* HAVE_UNIXSOCKET */
1805 }
1806
1807 /****************************************************************************
1808  Get my own canonical name, including domain.
1809 ****************************************************************************/
1810
1811 const char *get_mydnsfullname(void)
1812 {
1813         struct addrinfo *res = NULL;
1814         char my_hostname[HOST_NAME_MAX];
1815         bool ret;
1816         DATA_BLOB tmp;
1817
1818         if (memcache_lookup(NULL, SINGLETON_CACHE,
1819                         data_blob_string_const_null("get_mydnsfullname"),
1820                         &tmp)) {
1821                 SMB_ASSERT(tmp.length > 0);
1822                 return (const char *)tmp.data;
1823         }
1824
1825         /* get my host name */
1826         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1827                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1828                 return NULL;
1829         }
1830
1831         /* Ensure null termination. */
1832         my_hostname[sizeof(my_hostname)-1] = '\0';
1833
1834         ret = interpret_string_addr_internal(&res,
1835                                 my_hostname,
1836                                 AI_ADDRCONFIG|AI_CANONNAME);
1837
1838         if (!ret || res == NULL) {
1839                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1840                         "name %s [%s]\n",
1841                         my_hostname,
1842                         gai_strerror(ret) ));
1843                 return NULL;
1844         }
1845
1846         /*
1847          * Make sure that getaddrinfo() returns the "correct" host name.
1848          */
1849
1850         if (res->ai_canonname == NULL) {
1851                 DEBUG(3,("get_mydnsfullname: failed to get "
1852                         "canonical name for %s\n",
1853                         my_hostname));
1854                 freeaddrinfo(res);
1855                 return NULL;
1856         }
1857
1858         /* This copies the data, so we must do a lookup
1859          * afterwards to find the value to return.
1860          */
1861
1862         memcache_add(NULL, SINGLETON_CACHE,
1863                         data_blob_string_const_null("get_mydnsfullname"),
1864                         data_blob_string_const_null(res->ai_canonname));
1865
1866         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1867                         data_blob_string_const_null("get_mydnsfullname"),
1868                         &tmp)) {
1869                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1870                                 strlen(res->ai_canonname) + 1);
1871         }
1872
1873         freeaddrinfo(res);
1874
1875         return (const char *)tmp.data;
1876 }
1877
1878 /************************************************************
1879  Is this my name ?
1880 ************************************************************/
1881
1882 bool is_myname_or_ipaddr(const char *s)
1883 {
1884         TALLOC_CTX *ctx = talloc_tos();
1885         char addr[INET6_ADDRSTRLEN];
1886         char *name = NULL;
1887         const char *dnsname;
1888         char *servername = NULL;
1889
1890         if (!s) {
1891                 return false;
1892         }
1893
1894         /* Santize the string from '\\name' */
1895         name = talloc_strdup(ctx, s);
1896         if (!name) {
1897                 return false;
1898         }
1899
1900         servername = strrchr_m(name, '\\' );
1901         if (!servername) {
1902                 servername = name;
1903         } else {
1904                 servername++;
1905         }
1906
1907         /* Optimize for the common case */
1908         if (strequal(servername, global_myname())) {
1909                 return true;
1910         }
1911
1912         /* Check for an alias */
1913         if (is_myname(servername)) {
1914                 return true;
1915         }
1916
1917         /* Check for loopback */
1918         if (strequal(servername, "127.0.0.1") ||
1919                         strequal(servername, "::1")) {
1920                 return true;
1921         }
1922
1923         if (strequal(servername, "localhost")) {
1924                 return true;
1925         }
1926
1927         /* Maybe it's my dns name */
1928         dnsname = get_mydnsfullname();
1929         if (dnsname && strequal(servername, dnsname)) {
1930                 return true;
1931         }
1932
1933         /* Handle possible CNAME records - convert to an IP addr. */
1934         if (!is_ipaddress(servername)) {
1935                 /* Use DNS to resolve the name, but only the first address */
1936                 struct sockaddr_storage ss;
1937                 if (interpret_string_addr(&ss, servername, 0)) {
1938                         print_sockaddr(addr,
1939                                         sizeof(addr),
1940                                         &ss);
1941                         servername = addr;
1942                 }
1943         }
1944
1945         /* Maybe its an IP address? */
1946         if (is_ipaddress(servername)) {
1947                 struct sockaddr_storage ss;
1948                 struct iface_struct *nics;
1949                 int i, n;
1950
1951                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1952                         return false;
1953                 }
1954
1955                 if (is_zero_addr((struct sockaddr *)&ss) || 
1956                         is_loopback_addr((struct sockaddr *)&ss)) {
1957                         return false;
1958                 }
1959
1960                 nics = TALLOC_ARRAY(ctx, struct iface_struct,
1961                                         MAX_INTERFACES);
1962                 if (!nics) {
1963                         return false;
1964                 }
1965                 n = get_interfaces(nics, MAX_INTERFACES);
1966                 for (i=0; i<n; i++) {
1967                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1968                                 TALLOC_FREE(nics);
1969                                 return true;
1970                         }
1971                 }
1972                 TALLOC_FREE(nics);
1973         }
1974
1975         /* No match */
1976         return false;
1977 }