3fd0cc4ad31c83a0fe94ffecc9e2bbe94302b6fc
[ira/wip.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 /****************************************************************************
212  Return the port number we've bound to on a socket.
213 ****************************************************************************/
214
215 int get_socket_port(int fd)
216 {
217         struct sockaddr_storage sa;
218         socklen_t length = sizeof(sa);
219
220         if (fd == -1) {
221                 return -1;
222         }
223
224         if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
225                 DEBUG(0,("getpeername failed. Error was %s\n",
226                         strerror(errno) ));
227                 return -1;
228         }
229
230 #if defined(HAVE_IPV6)
231         if (sa.ss_family == AF_INET6) {
232                 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
233         }
234 #endif
235         if (sa.ss_family == AF_INET) {
236                 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
237         }
238         return -1;
239 }
240
241 const char *client_name(int fd)
242 {
243         return get_peer_name(fd,false);
244 }
245
246 const char *client_addr(int fd, char *addr, size_t addrlen)
247 {
248         return get_peer_addr(fd,addr,addrlen);
249 }
250
251 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
252 {
253         return get_socket_addr(fd, addr, addr_len);
254 }
255
256 #if 0
257 /* Not currently used. JRA. */
258 int client_socket_port(int fd)
259 {
260         return get_socket_port(fd);
261 }
262 #endif
263
264 /****************************************************************************
265  Accessor functions to make thread-safe code easier later...
266 ****************************************************************************/
267
268 void set_smb_read_error(enum smb_read_errors *pre,
269                         enum smb_read_errors newerr)
270 {
271         if (pre) {
272                 *pre = newerr;
273         }
274 }
275
276 void cond_set_smb_read_error(enum smb_read_errors *pre,
277                         enum smb_read_errors newerr)
278 {
279         if (pre && *pre == SMB_READ_OK) {
280                 *pre = newerr;
281         }
282 }
283
284 /****************************************************************************
285  Determine if a file descriptor is in fact a socket.
286 ****************************************************************************/
287
288 bool is_a_socket(int fd)
289 {
290         int v;
291         socklen_t l;
292         l = sizeof(int);
293         return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
294 }
295
296 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
297
298 typedef struct smb_socket_option {
299         const char *name;
300         int level;
301         int option;
302         int value;
303         int opttype;
304 } smb_socket_option;
305
306 static const smb_socket_option socket_options[] = {
307   {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
308   {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
309   {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
310 #ifdef TCP_NODELAY
311   {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
312 #endif
313 #ifdef TCP_KEEPCNT
314   {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
315 #endif
316 #ifdef TCP_KEEPIDLE
317   {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
318 #endif
319 #ifdef TCP_KEEPINTVL
320   {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
321 #endif
322 #ifdef IPTOS_LOWDELAY
323   {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
324 #endif
325 #ifdef IPTOS_THROUGHPUT
326   {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
327 #endif
328 #ifdef SO_REUSEPORT
329   {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
330 #endif
331 #ifdef SO_SNDBUF
332   {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
333 #endif
334 #ifdef SO_RCVBUF
335   {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
336 #endif
337 #ifdef SO_SNDLOWAT
338   {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
339 #endif
340 #ifdef SO_RCVLOWAT
341   {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
342 #endif
343 #ifdef SO_SNDTIMEO
344   {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
345 #endif
346 #ifdef SO_RCVTIMEO
347   {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
348 #endif
349 #ifdef TCP_FASTACK
350   {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
351 #endif
352   {NULL,0,0,0,0}};
353
354 /****************************************************************************
355  Print socket options.
356 ****************************************************************************/
357
358 static void print_socket_options(int s)
359 {
360         int value;
361         socklen_t vlen = 4;
362         const smb_socket_option *p = &socket_options[0];
363
364         /* wrapped in if statement to prevent streams
365          * leak in SCO Openserver 5.0 */
366         /* reported on samba-technical  --jerry */
367         if ( DEBUGLEVEL >= 5 ) {
368                 DEBUG(5,("Socket options:\n"));
369                 for (; p->name != NULL; p++) {
370                         if (getsockopt(s, p->level, p->option,
371                                                 (void *)&value, &vlen) == -1) {
372                                 DEBUGADD(5,("\tCould not test socket option %s.\n",
373                                                         p->name));
374                         } else {
375                                 DEBUGADD(5,("\t%s = %d\n",
376                                                         p->name,value));
377                         }
378                 }
379         }
380  }
381
382 /****************************************************************************
383  Set user socket options.
384 ****************************************************************************/
385
386 void set_socket_options(int fd, const char *options)
387 {
388         TALLOC_CTX *ctx = talloc_stackframe();
389         char *tok;
390
391         while (next_token_talloc(ctx, &options, &tok," \t,")) {
392                 int ret=0,i;
393                 int value = 1;
394                 char *p;
395                 bool got_value = false;
396
397                 if ((p = strchr_m(tok,'='))) {
398                         *p = 0;
399                         value = atoi(p+1);
400                         got_value = true;
401                 }
402
403                 for (i=0;socket_options[i].name;i++)
404                         if (strequal(socket_options[i].name,tok))
405                                 break;
406
407                 if (!socket_options[i].name) {
408                         DEBUG(0,("Unknown socket option %s\n",tok));
409                         continue;
410                 }
411
412                 switch (socket_options[i].opttype) {
413                 case OPT_BOOL:
414                 case OPT_INT:
415                         ret = setsockopt(fd,socket_options[i].level,
416                                         socket_options[i].option,
417                                         (char *)&value,sizeof(int));
418                         break;
419
420                 case OPT_ON:
421                         if (got_value)
422                                 DEBUG(0,("syntax error - %s "
423                                         "does not take a value\n",tok));
424
425                         {
426                                 int on = socket_options[i].value;
427                                 ret = setsockopt(fd,socket_options[i].level,
428                                         socket_options[i].option,
429                                         (char *)&on,sizeof(int));
430                         }
431                         break;
432                 }
433
434                 if (ret != 0) {
435                         /* be aware that some systems like Solaris return
436                          * EINVAL to a setsockopt() call when the client
437                          * sent a RST previously - no need to worry */
438                         DEBUG(2,("Failed to set socket option %s (Error %s)\n",
439                                 tok, strerror(errno) ));
440                 }
441         }
442
443         TALLOC_FREE(ctx);
444         print_socket_options(fd);
445 }
446
447 /****************************************************************************
448  Read from a socket.
449 ****************************************************************************/
450
451 ssize_t read_udp_v4_socket(int fd,
452                         char *buf,
453                         size_t len,
454                         struct sockaddr_storage *psa)
455 {
456         ssize_t ret;
457         socklen_t socklen = sizeof(*psa);
458         struct sockaddr_in *si = (struct sockaddr_in *)psa;
459
460         memset((char *)psa,'\0',socklen);
461
462         ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
463                         (struct sockaddr *)psa,&socklen);
464         if (ret <= 0) {
465                 /* Don't print a low debug error for a non-blocking socket. */
466                 if (errno == EAGAIN) {
467                         DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
468                 } else {
469                         DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
470                                 strerror(errno)));
471                 }
472                 return 0;
473         }
474
475         if (psa->ss_family != AF_INET) {
476                 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
477                         "(not IPv4)\n", (int)psa->ss_family));
478                 return 0;
479         }
480
481         DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
482                         inet_ntoa(si->sin_addr),
483                         si->sin_port,
484                         (unsigned long)ret));
485
486         return ret;
487 }
488
489 /****************************************************************************
490  Read data from a socket with a timout in msec.
491  mincount = if timeout, minimum to read before returning
492  maxcount = number to be read.
493  time_out = timeout in milliseconds
494 ****************************************************************************/
495
496 NTSTATUS read_socket_with_timeout(int fd, char *buf,
497                                   size_t mincnt, size_t maxcnt,
498                                   unsigned int time_out,
499                                   size_t *size_ret)
500 {
501         fd_set fds;
502         int selrtn;
503         ssize_t readret;
504         size_t nread = 0;
505         struct timeval timeout;
506         char addr[INET6_ADDRSTRLEN];
507
508         /* just checking .... */
509         if (maxcnt <= 0)
510                 return NT_STATUS_OK;
511
512         /* Blocking read */
513         if (time_out == 0) {
514                 if (mincnt == 0) {
515                         mincnt = maxcnt;
516                 }
517
518                 while (nread < mincnt) {
519                         readret = sys_recv(fd, buf + nread, maxcnt - nread, 0);
520
521                         if (readret == 0) {
522                                 DEBUG(5,("read_socket_with_timeout: "
523                                         "blocking read. EOF from client.\n"));
524                                 return NT_STATUS_END_OF_FILE;
525                         }
526
527                         if (readret == -1) {
528                                 if (fd == get_client_fd()) {
529                                         /* Try and give an error message
530                                          * saying what client failed. */
531                                         DEBUG(0,("read_socket_with_timeout: "
532                                                 "client %s read error = %s.\n",
533                                                 get_peer_addr(fd,addr,sizeof(addr)),
534                                                 strerror(errno) ));
535                                 } else {
536                                         DEBUG(0,("read_socket_with_timeout: "
537                                                 "read error = %s.\n",
538                                                 strerror(errno) ));
539                                 }
540                                 return map_nt_error_from_unix(errno);
541                         }
542                         nread += readret;
543                 }
544                 goto done;
545         }
546
547         /* Most difficult - timeout read */
548         /* If this is ever called on a disk file and
549            mincnt is greater then the filesize then
550            system performance will suffer severely as
551            select always returns true on disk files */
552
553         /* Set initial timeout */
554         timeout.tv_sec = (time_t)(time_out / 1000);
555         timeout.tv_usec = (long)(1000 * (time_out % 1000));
556
557         for (nread=0; nread < mincnt; ) {
558                 FD_ZERO(&fds);
559                 FD_SET(fd,&fds);
560
561                 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
562
563                 /* Check if error */
564                 if (selrtn == -1) {
565                         /* something is wrong. Maybe the socket is dead? */
566                         if (fd == get_client_fd()) {
567                                 /* Try and give an error message saying
568                                  * what client failed. */
569                                 DEBUG(0,("read_socket_with_timeout: timeout "
570                                 "read for client %s. select error = %s.\n",
571                                 get_peer_addr(fd,addr,sizeof(addr)),
572                                 strerror(errno) ));
573                         } else {
574                                 DEBUG(0,("read_socket_with_timeout: timeout "
575                                 "read. select error = %s.\n",
576                                 strerror(errno) ));
577                         }
578                         return map_nt_error_from_unix(errno);
579                 }
580
581                 /* Did we timeout ? */
582                 if (selrtn == 0) {
583                         DEBUG(10,("read_socket_with_timeout: timeout read. "
584                                 "select timed out.\n"));
585                         return NT_STATUS_IO_TIMEOUT;
586                 }
587
588                 readret = sys_recv(fd, buf+nread, maxcnt-nread, 0);
589
590                 if (readret == 0) {
591                         /* we got EOF on the file descriptor */
592                         DEBUG(5,("read_socket_with_timeout: timeout read. "
593                                 "EOF from client.\n"));
594                         return NT_STATUS_END_OF_FILE;
595                 }
596
597                 if (readret == -1) {
598                         /* the descriptor is probably dead */
599                         if (fd == get_client_fd()) {
600                                 /* Try and give an error message
601                                  * saying what client failed. */
602                                 DEBUG(0,("read_socket_with_timeout: timeout "
603                                         "read to client %s. read error = %s.\n",
604                                         get_peer_addr(fd,addr,sizeof(addr)),
605                                         strerror(errno) ));
606                         } else {
607                                 DEBUG(0,("read_socket_with_timeout: timeout "
608                                         "read. read error = %s.\n",
609                                         strerror(errno) ));
610                         }
611                         return map_nt_error_from_unix(errno);
612                 }
613
614                 nread += readret;
615         }
616
617  done:
618         /* Return the number we got */
619         if (size_ret) {
620                 *size_ret = nread;
621         }
622         return NT_STATUS_OK;
623 }
624
625 /****************************************************************************
626  Read data from the client, reading exactly N bytes.
627 ****************************************************************************/
628
629 NTSTATUS read_data(int fd, char *buffer, size_t N)
630 {
631         return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
632 }
633
634 /****************************************************************************
635  Write all data from an iov array
636 ****************************************************************************/
637
638 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
639 {
640         int i;
641         size_t to_send;
642         ssize_t thistime;
643         size_t sent;
644         struct iovec *iov_copy, *iov;
645
646         to_send = 0;
647         for (i=0; i<iovcnt; i++) {
648                 to_send += orig_iov[i].iov_len;
649         }
650
651         thistime = sys_writev(fd, orig_iov, iovcnt);
652         if ((thistime <= 0) || (thistime == to_send)) {
653                 return thistime;
654         }
655         sent = thistime;
656
657         /*
658          * We could not send everything in one call. Make a copy of iov that
659          * we can mess with. We keep a copy of the array start in iov_copy for
660          * the TALLOC_FREE, because we're going to modify iov later on,
661          * discarding elements.
662          */
663
664         iov_copy = (struct iovec *)TALLOC_MEMDUP(
665                 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
666
667         if (iov_copy == NULL) {
668                 errno = ENOMEM;
669                 return -1;
670         }
671         iov = iov_copy;
672
673         while (sent < to_send) {
674                 /*
675                  * We have to discard "thistime" bytes from the beginning
676                  * iov array, "thistime" contains the number of bytes sent
677                  * via writev last.
678                  */
679                 while (thistime > 0) {
680                         if (thistime < iov[0].iov_len) {
681                                 char *new_base =
682                                         (char *)iov[0].iov_base + thistime;
683                                 iov[0].iov_base = new_base;
684                                 iov[0].iov_len -= thistime;
685                                 break;
686                         }
687                         thistime -= iov[0].iov_len;
688                         iov += 1;
689                         iovcnt -= 1;
690                 }
691
692                 thistime = sys_writev(fd, iov, iovcnt);
693                 if (thistime <= 0) {
694                         break;
695                 }
696                 sent += thistime;
697         }
698
699         TALLOC_FREE(iov_copy);
700         return sent;
701 }
702
703 /****************************************************************************
704  Write data to a fd.
705 ****************************************************************************/
706
707 ssize_t write_data(int fd, const char *buffer, size_t N)
708 {
709         ssize_t ret;
710         struct iovec iov;
711
712         iov.iov_base = CONST_DISCARD(char *, buffer);
713         iov.iov_len = N;
714
715         ret = write_data_iov(fd, &iov, 1);
716         if (ret >= 0) {
717                 return ret;
718         }
719
720         if (fd == get_client_fd()) {
721                 char addr[INET6_ADDRSTRLEN];
722                 /*
723                  * Try and give an error message saying what client failed.
724                  */
725                 DEBUG(0, ("write_data: write failure in writing to client %s. "
726                           "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
727                           strerror(errno)));
728         } else {
729                 DEBUG(0,("write_data: write failure. Error = %s\n",
730                          strerror(errno) ));
731         }
732
733         return -1;
734 }
735
736 /****************************************************************************
737  Send a keepalive packet (rfc1002).
738 ****************************************************************************/
739
740 bool send_keepalive(int client)
741 {
742         unsigned char buf[4];
743
744         buf[0] = SMBkeepalive;
745         buf[1] = buf[2] = buf[3] = 0;
746
747         return(write_data(client,(char *)buf,4) == 4);
748 }
749
750 /****************************************************************************
751  Read 4 bytes of a smb packet and return the smb length of the packet.
752  Store the result in the buffer.
753  This version of the function will return a length of zero on receiving
754  a keepalive packet.
755  Timeout is in milliseconds.
756 ****************************************************************************/
757
758 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
759                                           unsigned int timeout,
760                                           size_t *len)
761 {
762         int msg_type;
763         NTSTATUS status;
764
765         status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
766
767         if (!NT_STATUS_IS_OK(status)) {
768                 return status;
769         }
770
771         *len = smb_len(inbuf);
772         msg_type = CVAL(inbuf,0);
773
774         if (msg_type == SMBkeepalive) {
775                 DEBUG(5,("Got keepalive packet\n"));
776         }
777
778         DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
779
780         return NT_STATUS_OK;
781 }
782
783 /****************************************************************************
784  Read 4 bytes of a smb packet and return the smb length of the packet.
785  Store the result in the buffer. This version of the function will
786  never return a session keepalive (length of zero).
787  Timeout is in milliseconds.
788 ****************************************************************************/
789
790 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
791                          size_t *len)
792 {
793         uint8_t msgtype = SMBkeepalive;
794
795         while (msgtype == SMBkeepalive) {
796                 NTSTATUS status;
797
798                 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
799                                                           len);
800                 if (!NT_STATUS_IS_OK(status)) {
801                         return status;
802                 }
803
804                 msgtype = CVAL(inbuf, 0);
805         }
806
807         DEBUG(10,("read_smb_length: got smb length of %lu\n",
808                   (unsigned long)len));
809
810         return NT_STATUS_OK;
811 }
812
813 /****************************************************************************
814  Read an smb from a fd.
815  The timeout is in milliseconds.
816  This function will return on receipt of a session keepalive packet.
817  maxlen is the max number of bytes to return, not including the 4 byte
818  length. If zero it means buflen limit.
819  Doesn't check the MAC on signed packets.
820 ****************************************************************************/
821
822 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
823                          size_t maxlen, size_t *p_len)
824 {
825         size_t len;
826         NTSTATUS status;
827
828         status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
829
830         if (!NT_STATUS_IS_OK(status)) {
831                 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
832                 return status;
833         }
834
835         if (len > buflen) {
836                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
837                                         (unsigned long)len));
838                 return NT_STATUS_INVALID_PARAMETER;
839         }
840
841         if(len > 0) {
842                 if (maxlen) {
843                         len = MIN(len,maxlen);
844                 }
845
846                 status = read_socket_with_timeout(
847                         fd, buffer+4, len, len, timeout, &len);
848
849                 if (!NT_STATUS_IS_OK(status)) {
850                         return status;
851                 }
852
853                 /* not all of samba3 properly checks for packet-termination
854                  * of strings. This ensures that we don't run off into
855                  * empty space. */
856                 SSVAL(buffer+4,len, 0);
857         }
858
859         *p_len = len;
860         return NT_STATUS_OK;
861 }
862
863 /****************************************************************************
864  Open a socket of the specified type, port, and address for incoming data.
865 ****************************************************************************/
866
867 int open_socket_in(int type,
868                 uint16_t port,
869                 int dlevel,
870                 const struct sockaddr_storage *psock,
871                 bool rebind)
872 {
873         struct sockaddr_storage sock;
874         int res;
875         socklen_t slen = sizeof(struct sockaddr_in);
876
877         sock = *psock;
878
879 #if defined(HAVE_IPV6)
880         if (sock.ss_family == AF_INET6) {
881                 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
882                 slen = sizeof(struct sockaddr_in6);
883         }
884 #endif
885         if (sock.ss_family == AF_INET) {
886                 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
887         }
888
889         res = socket(sock.ss_family, type, 0 );
890         if( res == -1 ) {
891                 if( DEBUGLVL(0) ) {
892                         dbgtext( "open_socket_in(): socket() call failed: " );
893                         dbgtext( "%s\n", strerror( errno ) );
894                 }
895                 return -1;
896         }
897
898         /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
899         {
900                 int val = rebind ? 1 : 0;
901                 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
902                                         (char *)&val,sizeof(val)) == -1 ) {
903                         if( DEBUGLVL( dlevel ) ) {
904                                 dbgtext( "open_socket_in(): setsockopt: " );
905                                 dbgtext( "SO_REUSEADDR = %s ",
906                                                 val?"true":"false" );
907                                 dbgtext( "on port %d failed ", port );
908                                 dbgtext( "with error = %s\n", strerror(errno) );
909                         }
910                 }
911 #ifdef SO_REUSEPORT
912                 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
913                                         (char *)&val,sizeof(val)) == -1 ) {
914                         if( DEBUGLVL( dlevel ) ) {
915                                 dbgtext( "open_socket_in(): setsockopt: ");
916                                 dbgtext( "SO_REUSEPORT = %s ",
917                                                 val?"true":"false");
918                                 dbgtext( "on port %d failed ", port);
919                                 dbgtext( "with error = %s\n", strerror(errno));
920                         }
921                 }
922 #endif /* SO_REUSEPORT */
923         }
924
925         /* now we've got a socket - we need to bind it */
926         if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
927                 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
928                                 port == SMB_PORT2 || port == NMB_PORT) ) {
929                         char addr[INET6_ADDRSTRLEN];
930                         print_sockaddr(addr, sizeof(addr),
931                                         &sock);
932                         dbgtext( "bind failed on port %d ", port);
933                         dbgtext( "socket_addr = %s.\n", addr);
934                         dbgtext( "Error = %s\n", strerror(errno));
935                 }
936                 close(res);
937                 return -1;
938         }
939
940         DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
941         return( res );
942  }
943
944 struct open_socket_out_state {
945         int fd;
946         struct event_context *ev;
947         struct sockaddr_storage ss;
948         socklen_t salen;
949         uint16_t port;
950         int wait_nsec;
951 };
952
953 static void open_socket_out_connected(struct tevent_req *subreq);
954
955 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
956 {
957         if (s->fd != -1) {
958                 close(s->fd);
959         }
960         return 0;
961 }
962
963 /****************************************************************************
964  Create an outgoing socket. timeout is in milliseconds.
965 **************************************************************************/
966
967 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
968                                         struct event_context *ev,
969                                         const struct sockaddr_storage *pss,
970                                         uint16_t port,
971                                         int timeout)
972 {
973         char addr[INET6_ADDRSTRLEN];
974         struct tevent_req *result, *subreq;
975         struct open_socket_out_state *state;
976         NTSTATUS status;
977
978         result = tevent_req_create(mem_ctx, &state,
979                                    struct open_socket_out_state);
980         if (result == NULL) {
981                 return NULL;
982         }
983         state->ev = ev;
984         state->ss = *pss;
985         state->port = port;
986         state->wait_nsec = 10000;
987         state->salen = -1;
988
989         state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
990         if (state->fd == -1) {
991                 status = map_nt_error_from_unix(errno);
992                 goto post_status;
993         }
994         talloc_set_destructor(state, open_socket_out_state_destructor);
995
996         if (!tevent_req_set_endtime(
997                     result, ev, timeval_current_ofs(0, timeout*1000))) {
998                 goto fail;
999         }
1000
1001 #if defined(HAVE_IPV6)
1002         if (pss->ss_family == AF_INET6) {
1003                 struct sockaddr_in6 *psa6;
1004                 psa6 = (struct sockaddr_in6 *)&state->ss;
1005                 psa6->sin6_port = htons(port);
1006                 if (psa6->sin6_scope_id == 0
1007                     && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1008                         setup_linklocal_scope_id(
1009                                 (struct sockaddr *)&(state->ss));
1010                 }
1011                 state->salen = sizeof(struct sockaddr_in6);
1012         }
1013 #endif
1014         if (pss->ss_family == AF_INET) {
1015                 struct sockaddr_in *psa;
1016                 psa = (struct sockaddr_in *)&state->ss;
1017                 psa->sin_port = htons(port);
1018                 state->salen = sizeof(struct sockaddr_in);
1019         }
1020
1021         print_sockaddr(addr, sizeof(addr), &state->ss);
1022         DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1023
1024         subreq = async_connect_send(state, state->ev, state->fd,
1025                                     (struct sockaddr *)&state->ss,
1026                                     state->salen);
1027         if ((subreq == NULL)
1028             || !tevent_req_set_endtime(
1029                     subreq, state->ev,
1030                     timeval_current_ofs(0, state->wait_nsec))) {
1031                 goto fail;
1032         }
1033         tevent_req_set_callback(subreq, open_socket_out_connected, result);
1034         return result;
1035
1036  post_status:
1037         tevent_req_nterror(result, status);
1038         return tevent_req_post(result, ev);
1039  fail:
1040         TALLOC_FREE(result);
1041         return NULL;
1042 }
1043
1044 static void open_socket_out_connected(struct tevent_req *subreq)
1045 {
1046         struct tevent_req *req =
1047                 tevent_req_callback_data(subreq, struct tevent_req);
1048         struct open_socket_out_state *state =
1049                 tevent_req_data(req, struct open_socket_out_state);
1050         int ret;
1051         int sys_errno;
1052
1053         ret = async_connect_recv(subreq, &sys_errno);
1054         TALLOC_FREE(subreq);
1055         if (ret == 0) {
1056                 tevent_req_done(req);
1057                 return;
1058         }
1059
1060         if (
1061 #ifdef ETIMEDOUT
1062                 (sys_errno == ETIMEDOUT) ||
1063 #endif
1064                 (sys_errno == EINPROGRESS) ||
1065                 (sys_errno == EALREADY) ||
1066                 (sys_errno == EAGAIN)) {
1067
1068                 /*
1069                  * retry
1070                  */
1071
1072                 if (state->wait_nsec < 250000) {
1073                         state->wait_nsec *= 1.5;
1074                 }
1075
1076                 subreq = async_connect_send(state, state->ev, state->fd,
1077                                             (struct sockaddr *)&state->ss,
1078                                             state->salen);
1079                 if (tevent_req_nomem(subreq, req)) {
1080                         return;
1081                 }
1082                 if (!tevent_req_set_endtime(
1083                             subreq, state->ev,
1084                             timeval_current_ofs(0, state->wait_nsec))) {
1085                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1086                         return;
1087                 }
1088                 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1089                 return;
1090         }
1091
1092 #ifdef EISCONN
1093         if (sys_errno == EISCONN) {
1094                 tevent_req_done(req);
1095                 return;
1096         }
1097 #endif
1098
1099         /* real error */
1100         tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1101 }
1102
1103 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1104 {
1105         struct open_socket_out_state *state =
1106                 tevent_req_data(req, struct open_socket_out_state);
1107         NTSTATUS status;
1108
1109         if (tevent_req_is_nterror(req, &status)) {
1110                 return status;
1111         }
1112         *pfd = state->fd;
1113         state->fd = -1;
1114         return NT_STATUS_OK;
1115 }
1116
1117 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1118                          int timeout, int *pfd)
1119 {
1120         TALLOC_CTX *frame = talloc_stackframe();
1121         struct event_context *ev;
1122         struct tevent_req *req;
1123         NTSTATUS status = NT_STATUS_NO_MEMORY;
1124
1125         ev = event_context_init(frame);
1126         if (ev == NULL) {
1127                 goto fail;
1128         }
1129
1130         req = open_socket_out_send(frame, ev, pss, port, timeout);
1131         if (req == NULL) {
1132                 goto fail;
1133         }
1134         if (!tevent_req_poll(req, ev)) {
1135                 status = NT_STATUS_INTERNAL_ERROR;
1136                 goto fail;
1137         }
1138         status = open_socket_out_recv(req, pfd);
1139  fail:
1140         TALLOC_FREE(frame);
1141         return status;
1142 }
1143
1144 struct open_socket_out_defer_state {
1145         struct event_context *ev;
1146         struct sockaddr_storage ss;
1147         uint16_t port;
1148         int timeout;
1149         int fd;
1150 };
1151
1152 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1153 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1154
1155 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1156                                               struct event_context *ev,
1157                                               struct timeval wait_time,
1158                                               const struct sockaddr_storage *pss,
1159                                               uint16_t port,
1160                                               int timeout)
1161 {
1162         struct tevent_req *req, *subreq;
1163         struct open_socket_out_defer_state *state;
1164
1165         req = tevent_req_create(mem_ctx, &state,
1166                                 struct open_socket_out_defer_state);
1167         if (req == NULL) {
1168                 return NULL;
1169         }
1170         state->ev = ev;
1171         state->ss = *pss;
1172         state->port = port;
1173         state->timeout = timeout;
1174
1175         subreq = tevent_wakeup_send(
1176                 state, ev,
1177                 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1178         if (subreq == NULL) {
1179                 goto fail;
1180         }
1181         tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1182         return req;
1183  fail:
1184         TALLOC_FREE(req);
1185         return NULL;
1186 }
1187
1188 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1189 {
1190         struct tevent_req *req = tevent_req_callback_data(
1191                 subreq, struct tevent_req);
1192         struct open_socket_out_defer_state *state = tevent_req_data(
1193                 req, struct open_socket_out_defer_state);
1194         bool ret;
1195
1196         ret = tevent_wakeup_recv(subreq);
1197         TALLOC_FREE(subreq);
1198         if (!ret) {
1199                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1200                 return;
1201         }
1202
1203         subreq = open_socket_out_send(state, state->ev, &state->ss,
1204                                       state->port, state->timeout);
1205         if (tevent_req_nomem(subreq, req)) {
1206                 return;
1207         }
1208         tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1209 }
1210
1211 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1212 {
1213         struct tevent_req *req = tevent_req_callback_data(
1214                 subreq, struct tevent_req);
1215         struct open_socket_out_defer_state *state = tevent_req_data(
1216                 req, struct open_socket_out_defer_state);
1217         NTSTATUS status;
1218
1219         status = open_socket_out_recv(subreq, &state->fd);
1220         TALLOC_FREE(subreq);
1221         if (!NT_STATUS_IS_OK(status)) {
1222                 tevent_req_nterror(req, status);
1223                 return;
1224         }
1225         tevent_req_done(req);
1226 }
1227
1228 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1229 {
1230         struct open_socket_out_defer_state *state = tevent_req_data(
1231                 req, struct open_socket_out_defer_state);
1232         NTSTATUS status;
1233
1234         if (tevent_req_is_nterror(req, &status)) {
1235                 return status;
1236         }
1237         *pfd = state->fd;
1238         state->fd = -1;
1239         return NT_STATUS_OK;
1240 }
1241
1242 /*******************************************************************
1243  Create an outgoing TCP socket to the first addr that connects.
1244
1245  This is for simultaneous connection attempts to port 445 and 139 of a host
1246  or for simultatneous connection attempts to multiple DCs at once.  We return
1247  a socket fd of the first successful connection.
1248
1249  @param[in] addrs list of Internet addresses and ports to connect to
1250  @param[in] num_addrs number of address/port pairs in the addrs list
1251  @param[in] timeout time after which we stop waiting for a socket connection
1252             to succeed, given in milliseconds
1253  @param[out] fd_index the entry in addrs which we successfully connected to
1254  @param[out] fd fd of the open and connected socket
1255  @return true on a successful connection, false if all connection attempts
1256          failed or we timed out
1257 *******************************************************************/
1258
1259 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1260                          int timeout, int *fd_index, int *fd)
1261 {
1262         int i, resulting_index, res;
1263         int *sockets;
1264         bool good_connect;
1265
1266         fd_set r_fds, wr_fds;
1267         struct timeval tv;
1268         int maxfd;
1269
1270         int connect_loop = 10000; /* 10 milliseconds */
1271
1272         timeout *= 1000;        /* convert to microseconds */
1273
1274         sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1275
1276         if (sockets == NULL)
1277                 return false;
1278
1279         resulting_index = -1;
1280
1281         for (i=0; i<num_addrs; i++)
1282                 sockets[i] = -1;
1283
1284         for (i=0; i<num_addrs; i++) {
1285                 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1286                 if (sockets[i] < 0)
1287                         goto done;
1288                 set_blocking(sockets[i], false);
1289         }
1290
1291  connect_again:
1292         good_connect = false;
1293
1294         for (i=0; i<num_addrs; i++) {
1295                 const struct sockaddr * a = 
1296                     (const struct sockaddr *)&(addrs[i]);
1297
1298                 if (sockets[i] == -1)
1299                         continue;
1300
1301                 if (sys_connect(sockets[i], a) == 0) {
1302                         /* Rather unlikely as we are non-blocking, but it
1303                          * might actually happen. */
1304                         resulting_index = i;
1305                         goto done;
1306                 }
1307
1308                 if (errno == EINPROGRESS || errno == EALREADY ||
1309 #ifdef EISCONN
1310                         errno == EISCONN ||
1311 #endif
1312                     errno == EAGAIN || errno == EINTR) {
1313                         /* These are the error messages that something is
1314                            progressing. */
1315                         good_connect = true;
1316                 } else if (errno != 0) {
1317                         /* There was a direct error */
1318                         close(sockets[i]);
1319                         sockets[i] = -1;
1320                 }
1321         }
1322
1323         if (!good_connect) {
1324                 /* All of the connect's resulted in real error conditions */
1325                 goto done;
1326         }
1327
1328         /* Lets see if any of the connect attempts succeeded */
1329
1330         maxfd = 0;
1331         FD_ZERO(&wr_fds);
1332         FD_ZERO(&r_fds);
1333
1334         for (i=0; i<num_addrs; i++) {
1335                 if (sockets[i] == -1)
1336                         continue;
1337                 FD_SET(sockets[i], &wr_fds);
1338                 FD_SET(sockets[i], &r_fds);
1339                 if (sockets[i]>maxfd)
1340                         maxfd = sockets[i];
1341         }
1342
1343         tv.tv_sec = 0;
1344         tv.tv_usec = connect_loop;
1345
1346         res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1347
1348         if (res < 0)
1349                 goto done;
1350
1351         if (res == 0)
1352                 goto next_round;
1353
1354         for (i=0; i<num_addrs; i++) {
1355
1356                 if (sockets[i] == -1)
1357                         continue;
1358
1359                 /* Stevens, Network Programming says that if there's a
1360                  * successful connect, the socket is only writable. Upon an
1361                  * error, it's both readable and writable. */
1362
1363                 if (FD_ISSET(sockets[i], &r_fds) &&
1364                     FD_ISSET(sockets[i], &wr_fds)) {
1365                         /* readable and writable, so it's an error */
1366                         close(sockets[i]);
1367                         sockets[i] = -1;
1368                         continue;
1369                 }
1370
1371                 if (!FD_ISSET(sockets[i], &r_fds) &&
1372                     FD_ISSET(sockets[i], &wr_fds)) {
1373                         /* Only writable, so it's connected */
1374                         resulting_index = i;
1375                         goto done;
1376                 }
1377         }
1378
1379  next_round:
1380
1381         timeout -= connect_loop;
1382         if (timeout <= 0)
1383                 goto done;
1384         connect_loop *= 1.5;
1385         if (connect_loop > timeout)
1386                 connect_loop = timeout;
1387         goto connect_again;
1388
1389  done:
1390         for (i=0; i<num_addrs; i++) {
1391                 if (i == resulting_index)
1392                         continue;
1393                 if (sockets[i] >= 0)
1394                         close(sockets[i]);
1395         }
1396
1397         if (resulting_index >= 0) {
1398                 *fd_index = resulting_index;
1399                 *fd = sockets[*fd_index];
1400                 set_blocking(*fd, true);
1401         }
1402
1403         free(sockets);
1404
1405         return (resulting_index >= 0);
1406 }
1407 /****************************************************************************
1408  Open a connected UDP socket to host on port
1409 **************************************************************************/
1410
1411 int open_udp_socket(const char *host, int port)
1412 {
1413         int type = SOCK_DGRAM;
1414         struct sockaddr_in sock_out;
1415         int res;
1416         struct in_addr addr;
1417
1418         addr = interpret_addr2(host);
1419
1420         res = socket(PF_INET, type, 0);
1421         if (res == -1) {
1422                 return -1;
1423         }
1424
1425         memset((char *)&sock_out,'\0',sizeof(sock_out));
1426         putip((char *)&sock_out.sin_addr,(char *)&addr);
1427         sock_out.sin_port = htons(port);
1428         sock_out.sin_family = PF_INET;
1429
1430         if (sys_connect(res,(struct sockaddr *)&sock_out)) {
1431                 close(res);
1432                 return -1;
1433         }
1434
1435         return res;
1436 }
1437
1438 /*******************************************************************
1439  Return the IP addr of the remote end of a socket as a string.
1440  Optionally return the struct sockaddr_storage.
1441  ******************************************************************/
1442
1443 static const char *get_peer_addr_internal(int fd,
1444                                 char *addr_buf,
1445                                 size_t addr_buf_len,
1446                                 struct sockaddr *pss,
1447                                 socklen_t *plength)
1448 {
1449         struct sockaddr_storage ss;
1450         socklen_t length = sizeof(ss);
1451
1452         strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1453
1454         if (fd == -1) {
1455                 return addr_buf;
1456         }
1457
1458         if (pss == NULL) {
1459                 pss = (struct sockaddr *)&ss;
1460                 plength = &length;
1461         }
1462
1463         if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1464                 DEBUG(0,("getpeername failed. Error was %s\n",
1465                                         strerror(errno) ));
1466                 return addr_buf;
1467         }
1468
1469         print_sockaddr_len(addr_buf,
1470                         addr_buf_len,
1471                         pss,
1472                         *plength);
1473         return addr_buf;
1474 }
1475
1476 /*******************************************************************
1477  Matchname - determine if host name matches IP address. Used to
1478  confirm a hostname lookup to prevent spoof attacks.
1479 ******************************************************************/
1480
1481 static bool matchname(const char *remotehost,
1482                 const struct sockaddr *pss,
1483                 socklen_t len)
1484 {
1485         struct addrinfo *res = NULL;
1486         struct addrinfo *ailist = NULL;
1487         char addr_buf[INET6_ADDRSTRLEN];
1488         bool ret = interpret_string_addr_internal(&ailist,
1489                         remotehost,
1490                         AI_ADDRCONFIG|AI_CANONNAME);
1491
1492         if (!ret || ailist == NULL) {
1493                 DEBUG(3,("matchname: getaddrinfo failed for "
1494                         "name %s [%s]\n",
1495                         remotehost,
1496                         gai_strerror(ret) ));
1497                 return false;
1498         }
1499
1500         /*
1501          * Make sure that getaddrinfo() returns the "correct" host name.
1502          */
1503
1504         if (ailist->ai_canonname == NULL ||
1505                 (!strequal(remotehost, ailist->ai_canonname) &&
1506                  !strequal(remotehost, "localhost"))) {
1507                 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1508                          remotehost,
1509                          ailist->ai_canonname ?
1510                                  ailist->ai_canonname : "(NULL)"));
1511                 freeaddrinfo(ailist);
1512                 return false;
1513         }
1514
1515         /* Look up the host address in the address list we just got. */
1516         for (res = ailist; res; res = res->ai_next) {
1517                 if (!res->ai_addr) {
1518                         continue;
1519                 }
1520                 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1521                                         (struct sockaddr *)pss)) {
1522                         freeaddrinfo(ailist);
1523                         return true;
1524                 }
1525         }
1526
1527         /*
1528          * The host name does not map to the original host address. Perhaps
1529          * someone has compromised a name server. More likely someone botched
1530          * it, but that could be dangerous, too.
1531          */
1532
1533         DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1534                 print_sockaddr_len(addr_buf,
1535                         sizeof(addr_buf),
1536                         pss,
1537                         len),
1538                  ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1539
1540         if (ailist) {
1541                 freeaddrinfo(ailist);
1542         }
1543         return false;
1544 }
1545
1546 /*******************************************************************
1547  Deal with the singleton cache.
1548 ******************************************************************/
1549
1550 struct name_addr_pair {
1551         struct sockaddr_storage ss;
1552         const char *name;
1553 };
1554
1555 /*******************************************************************
1556  Lookup a name/addr pair. Returns memory allocated from memcache.
1557 ******************************************************************/
1558
1559 static bool lookup_nc(struct name_addr_pair *nc)
1560 {
1561         DATA_BLOB tmp;
1562
1563         ZERO_STRUCTP(nc);
1564
1565         if (!memcache_lookup(
1566                         NULL, SINGLETON_CACHE,
1567                         data_blob_string_const_null("get_peer_name"),
1568                         &tmp)) {
1569                 return false;
1570         }
1571
1572         memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1573         nc->name = (const char *)tmp.data + sizeof(nc->ss);
1574         return true;
1575 }
1576
1577 /*******************************************************************
1578  Save a name/addr pair.
1579 ******************************************************************/
1580
1581 static void store_nc(const struct name_addr_pair *nc)
1582 {
1583         DATA_BLOB tmp;
1584         size_t namelen = strlen(nc->name);
1585
1586         tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1587         if (!tmp.data) {
1588                 return;
1589         }
1590         memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1591         memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1592
1593         memcache_add(NULL, SINGLETON_CACHE,
1594                         data_blob_string_const_null("get_peer_name"),
1595                         tmp);
1596         data_blob_free(&tmp);
1597 }
1598
1599 /*******************************************************************
1600  Return the DNS name of the remote end of a socket.
1601 ******************************************************************/
1602
1603 const char *get_peer_name(int fd, bool force_lookup)
1604 {
1605         struct name_addr_pair nc;
1606         char addr_buf[INET6_ADDRSTRLEN];
1607         struct sockaddr_storage ss;
1608         socklen_t length = sizeof(ss);
1609         const char *p;
1610         int ret;
1611         char name_buf[MAX_DNS_NAME_LENGTH];
1612         char tmp_name[MAX_DNS_NAME_LENGTH];
1613
1614         /* reverse lookups can be *very* expensive, and in many
1615            situations won't work because many networks don't link dhcp
1616            with dns. To avoid the delay we avoid the lookup if
1617            possible */
1618         if (!lp_hostname_lookups() && (force_lookup == false)) {
1619                 length = sizeof(nc.ss);
1620                 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1621                         (struct sockaddr *)&nc.ss, &length);
1622                 store_nc(&nc);
1623                 lookup_nc(&nc);
1624                 return nc.name ? nc.name : "UNKNOWN";
1625         }
1626
1627         lookup_nc(&nc);
1628
1629         memset(&ss, '\0', sizeof(ss));
1630         p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1631
1632         /* it might be the same as the last one - save some DNS work */
1633         if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1634                 return nc.name ? nc.name : "UNKNOWN";
1635         }
1636
1637         /* Not the same. We need to lookup. */
1638         if (fd == -1) {
1639                 return "UNKNOWN";
1640         }
1641
1642         /* Look up the remote host name. */
1643         ret = sys_getnameinfo((struct sockaddr *)&ss,
1644                         length,
1645                         name_buf,
1646                         sizeof(name_buf),
1647                         NULL,
1648                         0,
1649                         0);
1650
1651         if (ret) {
1652                 DEBUG(1,("get_peer_name: getnameinfo failed "
1653                         "for %s with error %s\n",
1654                         p,
1655                         gai_strerror(ret)));
1656                 strlcpy(name_buf, p, sizeof(name_buf));
1657         } else {
1658                 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1659                         DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1660                         strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1661                 }
1662         }
1663
1664         /* can't pass the same source and dest strings in when you
1665            use --enable-developer or the clobber_region() call will
1666            get you */
1667
1668         strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1669         alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1670         if (strstr(name_buf,"..")) {
1671                 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1672         }
1673
1674         nc.name = name_buf;
1675         nc.ss = ss;
1676
1677         store_nc(&nc);
1678         lookup_nc(&nc);
1679         return nc.name ? nc.name : "UNKNOWN";
1680 }
1681
1682 /*******************************************************************
1683  Return the IP addr of the remote end of a socket as a string.
1684  ******************************************************************/
1685
1686 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1687 {
1688         return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1689 }
1690
1691 /*******************************************************************
1692  Create protected unix domain socket.
1693
1694  Some unixes cannot set permissions on a ux-dom-sock, so we
1695  have to make sure that the directory contains the protection
1696  permissions instead.
1697  ******************************************************************/
1698
1699 int create_pipe_sock(const char *socket_dir,
1700                      const char *socket_name,
1701                      mode_t dir_perms)
1702 {
1703 #ifdef HAVE_UNIXSOCKET
1704         struct sockaddr_un sunaddr;
1705         struct stat st;
1706         int sock;
1707         mode_t old_umask;
1708         char *path = NULL;
1709
1710         old_umask = umask(0);
1711
1712         /* Create the socket directory or reuse the existing one */
1713
1714         if (lstat(socket_dir, &st) == -1) {
1715                 if (errno == ENOENT) {
1716                         /* Create directory */
1717                         if (mkdir(socket_dir, dir_perms) == -1) {
1718                                 DEBUG(0, ("error creating socket directory "
1719                                         "%s: %s\n", socket_dir,
1720                                         strerror(errno)));
1721                                 goto out_umask;
1722                         }
1723                 } else {
1724                         DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1725                                 socket_dir, strerror(errno)));
1726                         goto out_umask;
1727                 }
1728         } else {
1729                 /* Check ownership and permission on existing directory */
1730                 if (!S_ISDIR(st.st_mode)) {
1731                         DEBUG(0, ("socket directory %s isn't a directory\n",
1732                                 socket_dir));
1733                         goto out_umask;
1734                 }
1735                 if ((st.st_uid != sec_initial_uid()) ||
1736                                 ((st.st_mode & 0777) != dir_perms)) {
1737                         DEBUG(0, ("invalid permissions on socket directory "
1738                                 "%s\n", socket_dir));
1739                         goto out_umask;
1740                 }
1741         }
1742
1743         /* Create the socket file */
1744
1745         sock = socket(AF_UNIX, SOCK_STREAM, 0);
1746
1747         if (sock == -1) {
1748                 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1749                         strerror(errno) ));
1750                 goto out_close;
1751         }
1752
1753         if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1754                 goto out_close;
1755         }
1756
1757         unlink(path);
1758         memset(&sunaddr, 0, sizeof(sunaddr));
1759         sunaddr.sun_family = AF_UNIX;
1760         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1761
1762         if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1763                 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1764                         strerror(errno)));
1765                 goto out_close;
1766         }
1767
1768         if (listen(sock, 5) == -1) {
1769                 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1770                         strerror(errno)));
1771                 goto out_close;
1772         }
1773
1774         SAFE_FREE(path);
1775
1776         umask(old_umask);
1777         return sock;
1778
1779 out_close:
1780         SAFE_FREE(path);
1781         if (sock != -1)
1782                 close(sock);
1783
1784 out_umask:
1785         umask(old_umask);
1786         return -1;
1787
1788 #else
1789         DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1790         return -1;
1791 #endif /* HAVE_UNIXSOCKET */
1792 }
1793
1794 /****************************************************************************
1795  Get my own canonical name, including domain.
1796 ****************************************************************************/
1797
1798 const char *get_mydnsfullname(void)
1799 {
1800         struct addrinfo *res = NULL;
1801         char my_hostname[HOST_NAME_MAX];
1802         bool ret;
1803         DATA_BLOB tmp;
1804
1805         if (memcache_lookup(NULL, SINGLETON_CACHE,
1806                         data_blob_string_const_null("get_mydnsfullname"),
1807                         &tmp)) {
1808                 SMB_ASSERT(tmp.length > 0);
1809                 return (const char *)tmp.data;
1810         }
1811
1812         /* get my host name */
1813         if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1814                 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1815                 return NULL;
1816         }
1817
1818         /* Ensure null termination. */
1819         my_hostname[sizeof(my_hostname)-1] = '\0';
1820
1821         ret = interpret_string_addr_internal(&res,
1822                                 my_hostname,
1823                                 AI_ADDRCONFIG|AI_CANONNAME);
1824
1825         if (!ret || res == NULL) {
1826                 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1827                         "name %s [%s]\n",
1828                         my_hostname,
1829                         gai_strerror(ret) ));
1830                 return NULL;
1831         }
1832
1833         /*
1834          * Make sure that getaddrinfo() returns the "correct" host name.
1835          */
1836
1837         if (res->ai_canonname == NULL) {
1838                 DEBUG(3,("get_mydnsfullname: failed to get "
1839                         "canonical name for %s\n",
1840                         my_hostname));
1841                 freeaddrinfo(res);
1842                 return NULL;
1843         }
1844
1845         /* This copies the data, so we must do a lookup
1846          * afterwards to find the value to return.
1847          */
1848
1849         memcache_add(NULL, SINGLETON_CACHE,
1850                         data_blob_string_const_null("get_mydnsfullname"),
1851                         data_blob_string_const_null(res->ai_canonname));
1852
1853         if (!memcache_lookup(NULL, SINGLETON_CACHE,
1854                         data_blob_string_const_null("get_mydnsfullname"),
1855                         &tmp)) {
1856                 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1857                                 strlen(res->ai_canonname) + 1);
1858         }
1859
1860         freeaddrinfo(res);
1861
1862         return (const char *)tmp.data;
1863 }
1864
1865 /************************************************************
1866  Is this my name ?
1867 ************************************************************/
1868
1869 bool is_myname_or_ipaddr(const char *s)
1870 {
1871         TALLOC_CTX *ctx = talloc_tos();
1872         char addr[INET6_ADDRSTRLEN];
1873         char *name = NULL;
1874         const char *dnsname;
1875         char *servername = NULL;
1876
1877         if (!s) {
1878                 return false;
1879         }
1880
1881         /* Santize the string from '\\name' */
1882         name = talloc_strdup(ctx, s);
1883         if (!name) {
1884                 return false;
1885         }
1886
1887         servername = strrchr_m(name, '\\' );
1888         if (!servername) {
1889                 servername = name;
1890         } else {
1891                 servername++;
1892         }
1893
1894         /* Optimize for the common case */
1895         if (strequal(servername, global_myname())) {
1896                 return true;
1897         }
1898
1899         /* Check for an alias */
1900         if (is_myname(servername)) {
1901                 return true;
1902         }
1903
1904         /* Check for loopback */
1905         if (strequal(servername, "127.0.0.1") ||
1906                         strequal(servername, "::1")) {
1907                 return true;
1908         }
1909
1910         if (strequal(servername, "localhost")) {
1911                 return true;
1912         }
1913
1914         /* Maybe it's my dns name */
1915         dnsname = get_mydnsfullname();
1916         if (dnsname && strequal(servername, dnsname)) {
1917                 return true;
1918         }
1919
1920         /* Handle possible CNAME records - convert to an IP addr. */
1921         if (!is_ipaddress(servername)) {
1922                 /* Use DNS to resolve the name, but only the first address */
1923                 struct sockaddr_storage ss;
1924                 if (interpret_string_addr(&ss, servername, 0)) {
1925                         print_sockaddr(addr,
1926                                         sizeof(addr),
1927                                         &ss);
1928                         servername = addr;
1929                 }
1930         }
1931
1932         /* Maybe its an IP address? */
1933         if (is_ipaddress(servername)) {
1934                 struct sockaddr_storage ss;
1935                 struct iface_struct *nics;
1936                 int i, n;
1937
1938                 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1939                         return false;
1940                 }
1941
1942                 if (ismyaddr((struct sockaddr *)&ss)) {
1943                         return true;
1944                 }
1945
1946                 if (is_zero_addr((struct sockaddr *)&ss) || 
1947                         is_loopback_addr((struct sockaddr *)&ss)) {
1948                         return false;
1949                 }
1950
1951                 nics = TALLOC_ARRAY(ctx, struct iface_struct,
1952                                         MAX_INTERFACES);
1953                 if (!nics) {
1954                         return false;
1955                 }
1956                 n = get_interfaces(nics, MAX_INTERFACES);
1957                 for (i=0; i<n; i++) {
1958                         if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1959                                 TALLOC_FREE(nics);
1960                                 return true;
1961                         }
1962                 }
1963                 TALLOC_FREE(nics);
1964         }
1965
1966         /* No match */
1967         return false;
1968 }
1969
1970 /*
1971  * Read an smb packet asynchronously, discard keepalives
1972  */
1973
1974 struct read_smb_state {
1975         struct tevent_context *ev;
1976         int fd;
1977         uint8_t *buf;
1978 };
1979
1980 static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
1981 static void read_smb_done(struct tevent_req *subreq);
1982
1983 struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
1984                                  struct tevent_context *ev,
1985                                  int fd)
1986 {
1987         struct tevent_req *result, *subreq;
1988         struct read_smb_state *state;
1989
1990         result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
1991         if (result == NULL) {
1992                 return NULL;
1993         }
1994         state->ev = ev;
1995         state->fd = fd;
1996
1997         subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
1998         if (subreq == NULL) {
1999                 goto fail;
2000         }
2001         tevent_req_set_callback(subreq, read_smb_done, result);
2002         return result;
2003  fail:
2004         TALLOC_FREE(result);
2005         return NULL;
2006 }
2007
2008 static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
2009 {
2010         if (buflen > 4) {
2011                 return 0;       /* We've been here, we're done */
2012         }
2013         return smb_len_large(buf);
2014 }
2015
2016 static void read_smb_done(struct tevent_req *subreq)
2017 {
2018         struct tevent_req *req = tevent_req_callback_data(
2019                 subreq, struct tevent_req);
2020         struct read_smb_state *state = tevent_req_data(
2021                 req, struct read_smb_state);
2022         ssize_t len;
2023         int err;
2024
2025         len = read_packet_recv(subreq, state, &state->buf, &err);
2026         TALLOC_FREE(subreq);
2027         if (len == -1) {
2028                 tevent_req_error(req, err);
2029                 return;
2030         }
2031
2032         if (CVAL(state->buf, 0) == SMBkeepalive) {
2033                 subreq = read_packet_send(state, state->ev, state->fd, 4,
2034                                           read_smb_more, NULL);
2035                 if (tevent_req_nomem(subreq, req)) {
2036                         return;
2037                 }
2038                 tevent_req_set_callback(subreq, read_smb_done, req);
2039                 return;
2040         }
2041         tevent_req_done(req);
2042 }
2043
2044 ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2045                       uint8_t **pbuf, int *perrno)
2046 {
2047         struct read_smb_state *state = tevent_req_data(
2048                 req, struct read_smb_state);
2049
2050         if (tevent_req_is_unix_error(req, perrno)) {
2051                 return -1;
2052         }
2053         *pbuf = talloc_move(mem_ctx, &state->buf);
2054         return talloc_get_size(*pbuf);
2055 }
2056
2057 struct getaddrinfo_state {
2058         const char *node;
2059         const char *service;
2060         const struct addrinfo *hints;
2061         struct addrinfo *res;
2062         int ret;
2063 };
2064
2065 static void getaddrinfo_do(void *private_data);
2066 static void getaddrinfo_done(struct tevent_req *subreq);
2067
2068 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
2069                                     struct tevent_context *ev,
2070                                     struct fncall_context *ctx,
2071                                     const char *node,
2072                                     const char *service,
2073                                     const struct addrinfo *hints)
2074 {
2075         struct tevent_req *req, *subreq;
2076         struct getaddrinfo_state *state;
2077
2078         req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
2079         if (req == NULL) {
2080                 return NULL;
2081         }
2082
2083         state->node = node;
2084         state->service = service;
2085         state->hints = hints;
2086
2087         subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
2088         if (tevent_req_nomem(subreq, req)) {
2089                 return tevent_req_post(req, ev);
2090         }
2091         tevent_req_set_callback(subreq, getaddrinfo_done, req);
2092         return req;
2093 }
2094
2095 static void getaddrinfo_do(void *private_data)
2096 {
2097         struct getaddrinfo_state *state =
2098                 (struct getaddrinfo_state *)private_data;
2099
2100         state->ret = getaddrinfo(state->node, state->service, state->hints,
2101                                  &state->res);
2102 }
2103
2104 static void getaddrinfo_done(struct tevent_req *subreq)
2105 {
2106         struct tevent_req *req = tevent_req_callback_data(
2107                 subreq, struct tevent_req);
2108         int ret, err;
2109
2110         ret = fncall_recv(subreq, &err);
2111         TALLOC_FREE(subreq);
2112         if (ret == -1) {
2113                 tevent_req_error(req, err);
2114                 return;
2115         }
2116         tevent_req_done(req);
2117 }
2118
2119 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
2120 {
2121         struct getaddrinfo_state *state = tevent_req_data(
2122                 req, struct getaddrinfo_state);
2123         int err;
2124
2125         if (tevent_req_is_unix_error(req, &err)) {
2126                 switch(err) {
2127                 case ENOMEM:
2128                         return EAI_MEMORY;
2129                 default:
2130                         return EAI_FAIL;
2131                 }
2132         }
2133         if (state->ret == 0) {
2134                 *res = state->res;
2135         }
2136         return state->ret;
2137 }