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