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