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
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.
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.
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/>.
24 /*******************************************************************
25 Map a text hostname or IP address (IPv4 or IPv6) into a
26 struct sockaddr_storage.
27 ******************************************************************/
29 bool interpret_string_addr(struct sockaddr_storage
*pss
,
33 struct addrinfo
*res
= NULL
;
34 #if defined(HAVE_IPV6)
35 char addr
[INET6_ADDRSTRLEN
];
36 unsigned int scope_id
= 0;
38 if (strchr_m(str
, ':')) {
39 char *p
= strchr_m(str
, '%');
42 * Cope with link-local.
43 * This is IP:v6:addr%ifname.
46 if (p
&& (p
> str
) && ((scope_id
= if_nametoindex(p
+1)) != 0)) {
48 MIN(PTR_DIFF(p
,str
)+1,
57 if (!interpret_string_addr_internal(&res
, str
, flags
|AI_ADDRCONFIG
)) {
63 /* Copy the first sockaddr. */
64 memcpy(pss
, res
->ai_addr
, res
->ai_addrlen
);
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
;
80 /*******************************************************************
81 Set an address to INADDR_ANY.
82 ******************************************************************/
84 void zero_sockaddr(struct sockaddr_storage
*pss
)
86 memset(pss
, '\0', sizeof(*pss
));
87 /* Ensure we're at least a valid sockaddr-storage. */
88 pss
->ss_family
= AF_INET
;
91 /****************************************************************************
92 Get a port number in host byte order from a sockaddr_storage.
93 ****************************************************************************/
95 uint16_t get_sockaddr_port(const struct sockaddr_storage
*pss
)
99 if (pss
->ss_family
!= AF_INET
) {
100 #if defined(HAVE_IPV6)
102 const struct sockaddr_in6
*sa6
=
103 (const struct sockaddr_in6
*)pss
;
104 port
= ntohs(sa6
->sin6_port
);
107 const struct sockaddr_in
*sa
=
108 (const struct sockaddr_in
*)pss
;
109 port
= ntohs(sa
->sin_port
);
114 /****************************************************************************
115 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
116 ****************************************************************************/
118 static char *print_sockaddr_len(char *dest
,
120 const struct sockaddr
*psa
,
126 (void)sys_getnameinfo(psa
,
134 /****************************************************************************
135 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
136 ****************************************************************************/
138 char *print_sockaddr(char *dest
,
140 const struct sockaddr_storage
*psa
)
142 return print_sockaddr_len(dest
, destlen
, (struct sockaddr
*)psa
,
143 sizeof(struct sockaddr_storage
));
146 /****************************************************************************
147 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
148 ****************************************************************************/
150 char *print_canonical_sockaddr(TALLOC_CTX
*ctx
,
151 const struct sockaddr_storage
*pss
)
153 char addr
[INET6_ADDRSTRLEN
];
157 /* Linux getnameinfo() man pages says port is unitialized if
158 service name is NULL. */
160 ret
= sys_getnameinfo((const struct sockaddr
*)pss
,
161 sizeof(struct sockaddr_storage
),
169 if (pss
->ss_family
!= AF_INET
) {
170 #if defined(HAVE_IPV6)
171 dest
= talloc_asprintf(ctx
, "[%s]", addr
);
176 dest
= talloc_asprintf(ctx
, "%s", addr
);
182 /****************************************************************************
183 Return the string of an IP address (IPv4 or IPv6).
184 ****************************************************************************/
186 static const char *get_socket_addr(int fd
, char *addr_buf
, size_t addr_len
)
188 struct sockaddr_storage sa
;
189 socklen_t length
= sizeof(sa
);
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.
196 strlcpy(addr_buf
, "0.0.0.0", addr_len
);
202 if (getsockname(fd
, (struct sockaddr
*)&sa
, &length
) < 0) {
203 DEBUG(0,("getsockname failed. Error was %s\n",
208 return print_sockaddr_len(addr_buf
, addr_len
, (struct sockaddr
*)&sa
, length
);
212 /* Not currently used. JRA. */
213 /****************************************************************************
214 Return the port number we've bound to on a socket.
215 ****************************************************************************/
217 static int get_socket_port(int fd
)
219 struct sockaddr_storage sa
;
220 socklen_t length
= sizeof(sa
);
226 if (getsockname(fd
, (struct sockaddr
*)&sa
, &length
) < 0) {
227 DEBUG(0,("getpeername failed. Error was %s\n",
232 #if defined(HAVE_IPV6)
233 if (sa
.ss_family
== AF_INET6
) {
234 return ntohs(((struct sockaddr_in6
*)&sa
)->sin6_port
);
237 if (sa
.ss_family
== AF_INET
) {
238 return ntohs(((struct sockaddr_in
*)&sa
)->sin_port
);
244 const char *client_name(int fd
)
246 return get_peer_name(fd
,false);
249 const char *client_addr(int fd
, char *addr
, size_t addrlen
)
251 return get_peer_addr(fd
,addr
,addrlen
);
254 const char *client_socket_addr(int fd
, char *addr
, size_t addr_len
)
256 return get_socket_addr(fd
, addr
, addr_len
);
260 /* Not currently used. JRA. */
261 int client_socket_port(int fd
)
263 return get_socket_port(fd
);
267 /****************************************************************************
268 Accessor functions to make thread-safe code easier later...
269 ****************************************************************************/
271 void set_smb_read_error(enum smb_read_errors
*pre
,
272 enum smb_read_errors newerr
)
279 void cond_set_smb_read_error(enum smb_read_errors
*pre
,
280 enum smb_read_errors newerr
)
282 if (pre
&& *pre
== SMB_READ_OK
) {
287 /****************************************************************************
288 Determine if a file descriptor is in fact a socket.
289 ****************************************************************************/
291 bool is_a_socket(int fd
)
296 return(getsockopt(fd
, SOL_SOCKET
, SO_TYPE
, (char *)&v
, &l
) == 0);
299 enum SOCK_OPT_TYPES
{OPT_BOOL
,OPT_INT
,OPT_ON
};
301 typedef struct smb_socket_option
{
309 static const smb_socket_option socket_options
[] = {
310 {"SO_KEEPALIVE", SOL_SOCKET
, SO_KEEPALIVE
, 0, OPT_BOOL
},
311 {"SO_REUSEADDR", SOL_SOCKET
, SO_REUSEADDR
, 0, OPT_BOOL
},
312 {"SO_BROADCAST", SOL_SOCKET
, SO_BROADCAST
, 0, OPT_BOOL
},
314 {"TCP_NODELAY", IPPROTO_TCP
, TCP_NODELAY
, 0, OPT_BOOL
},
317 {"TCP_KEEPCNT", IPPROTO_TCP
, TCP_KEEPCNT
, 0, OPT_INT
},
320 {"TCP_KEEPIDLE", IPPROTO_TCP
, TCP_KEEPIDLE
, 0, OPT_INT
},
323 {"TCP_KEEPINTVL", IPPROTO_TCP
, TCP_KEEPINTVL
, 0, OPT_INT
},
325 #ifdef IPTOS_LOWDELAY
326 {"IPTOS_LOWDELAY", IPPROTO_IP
, IP_TOS
, IPTOS_LOWDELAY
, OPT_ON
},
328 #ifdef IPTOS_THROUGHPUT
329 {"IPTOS_THROUGHPUT", IPPROTO_IP
, IP_TOS
, IPTOS_THROUGHPUT
, OPT_ON
},
332 {"SO_REUSEPORT", SOL_SOCKET
, SO_REUSEPORT
, 0, OPT_BOOL
},
335 {"SO_SNDBUF", SOL_SOCKET
, SO_SNDBUF
, 0, OPT_INT
},
338 {"SO_RCVBUF", SOL_SOCKET
, SO_RCVBUF
, 0, OPT_INT
},
341 {"SO_SNDLOWAT", SOL_SOCKET
, SO_SNDLOWAT
, 0, OPT_INT
},
344 {"SO_RCVLOWAT", SOL_SOCKET
, SO_RCVLOWAT
, 0, OPT_INT
},
347 {"SO_SNDTIMEO", SOL_SOCKET
, SO_SNDTIMEO
, 0, OPT_INT
},
350 {"SO_RCVTIMEO", SOL_SOCKET
, SO_RCVTIMEO
, 0, OPT_INT
},
353 {"TCP_FASTACK", IPPROTO_TCP
, TCP_FASTACK
, 0, OPT_INT
},
357 /****************************************************************************
358 Print socket options.
359 ****************************************************************************/
361 static void print_socket_options(int s
)
365 const smb_socket_option
*p
= &socket_options
[0];
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",
378 DEBUGADD(5,("\t%s = %d\n",
385 /****************************************************************************
386 Set user socket options.
387 ****************************************************************************/
389 void set_socket_options(int fd
, const char *options
)
391 TALLOC_CTX
*ctx
= talloc_stackframe();
394 while (next_token_talloc(ctx
, &options
, &tok
," \t,")) {
398 bool got_value
= false;
400 if ((p
= strchr_m(tok
,'='))) {
406 for (i
=0;socket_options
[i
].name
;i
++)
407 if (strequal(socket_options
[i
].name
,tok
))
410 if (!socket_options
[i
].name
) {
411 DEBUG(0,("Unknown socket option %s\n",tok
));
415 switch (socket_options
[i
].opttype
) {
418 ret
= setsockopt(fd
,socket_options
[i
].level
,
419 socket_options
[i
].option
,
420 (char *)&value
,sizeof(int));
425 DEBUG(0,("syntax error - %s "
426 "does not take a value\n",tok
));
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));
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
) ));
447 print_socket_options(fd
);
450 /****************************************************************************
452 ****************************************************************************/
454 ssize_t
read_udp_v4_socket(int fd
,
457 struct sockaddr_storage
*psa
)
460 socklen_t socklen
= sizeof(*psa
);
461 struct sockaddr_in
*si
= (struct sockaddr_in
*)psa
;
463 memset((char *)psa
,'\0',socklen
);
465 ret
= (ssize_t
)sys_recvfrom(fd
,buf
,len
,0,
466 (struct sockaddr
*)psa
,&socklen
);
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"));
472 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
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
));
484 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
485 inet_ntoa(si
->sin_addr
),
487 (unsigned long)ret
));
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 ****************************************************************************/
499 NTSTATUS
read_socket_with_timeout(int fd
, char *buf
,
500 size_t mincnt
, size_t maxcnt
,
501 unsigned int time_out
,
508 struct timeval timeout
;
509 char addr
[INET6_ADDRSTRLEN
];
511 /* just checking .... */
521 while (nread
< mincnt
) {
522 readret
= sys_read(fd
, buf
+ nread
, maxcnt
- nread
);
525 DEBUG(5,("read_socket_with_timeout: "
526 "blocking read. EOF from client.\n"));
527 return NT_STATUS_END_OF_FILE
;
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
)),
539 DEBUG(0,("read_socket_with_timeout: "
540 "read error = %s.\n",
543 return map_nt_error_from_unix(errno
);
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 */
556 /* Set initial timeout */
557 timeout
.tv_sec
= (time_t)(time_out
/ 1000);
558 timeout
.tv_usec
= (long)(1000 * (time_out
% 1000));
560 for (nread
=0; nread
< mincnt
; ) {
564 selrtn
= sys_select_intr(fd
+1,&fds
,NULL
,NULL
,&timeout
);
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
)),
577 DEBUG(0,("read_socket_with_timeout: timeout "
578 "read. select error = %s.\n",
581 return map_nt_error_from_unix(errno
);
584 /* Did we timeout ? */
586 DEBUG(10,("read_socket_with_timeout: timeout read. "
587 "select timed out.\n"));
588 return NT_STATUS_IO_TIMEOUT
;
591 readret
= sys_read(fd
, buf
+nread
, maxcnt
-nread
);
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
;
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
)),
610 DEBUG(0,("read_socket_with_timeout: timeout "
611 "read. read error = %s.\n",
614 return map_nt_error_from_unix(errno
);
621 /* Return the number we got */
628 /****************************************************************************
629 Read data from the client, reading exactly N bytes.
630 ****************************************************************************/
632 NTSTATUS
read_data(int fd
, char *buffer
, size_t N
)
634 return read_socket_with_timeout(fd
, buffer
, N
, N
, 0, NULL
);
637 /****************************************************************************
638 Write all data from an iov array
639 ****************************************************************************/
641 ssize_t
write_data_iov(int fd
, const struct iovec
*orig_iov
, int iovcnt
)
647 struct iovec
*iov_copy
, *iov
;
650 for (i
=0; i
<iovcnt
; i
++) {
651 to_send
+= orig_iov
[i
].iov_len
;
654 thistime
= sys_writev(fd
, orig_iov
, iovcnt
);
655 if ((thistime
<= 0) || (thistime
== to_send
)) {
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.
667 iov_copy
= (struct iovec
*)TALLOC_MEMDUP(
668 talloc_tos(), orig_iov
, sizeof(struct iovec
) * iovcnt
);
670 if (iov_copy
== NULL
) {
676 while (sent
< to_send
) {
678 * We have to discard "thistime" bytes from the beginning
679 * iov array, "thistime" contains the number of bytes sent
682 while (thistime
> 0) {
683 if (thistime
< iov
[0].iov_len
) {
685 (char *)iov
[0].iov_base
+ thistime
;
686 iov
[0].iov_base
= new_base
;
687 iov
[0].iov_len
-= thistime
;
690 thistime
-= iov
[0].iov_len
;
695 thistime
= sys_writev(fd
, iov
, iovcnt
);
702 TALLOC_FREE(iov_copy
);
706 /****************************************************************************
708 ****************************************************************************/
710 ssize_t
write_data(int fd
, const char *buffer
, size_t N
)
715 iov
.iov_base
= CONST_DISCARD(char *, buffer
);
718 ret
= write_data_iov(fd
, &iov
, 1);
723 if (fd
== get_client_fd()) {
724 char addr
[INET6_ADDRSTRLEN
];
726 * Try and give an error message saying what client failed.
728 DEBUG(0, ("write_data: write failure in writing to client %s. "
729 "Error %s\n", get_peer_addr(fd
,addr
,sizeof(addr
)),
732 DEBUG(0,("write_data: write failure. Error = %s\n",
739 /****************************************************************************
740 Send a keepalive packet (rfc1002).
741 ****************************************************************************/
743 bool send_keepalive(int client
)
745 unsigned char buf
[4];
747 buf
[0] = SMBkeepalive
;
748 buf
[1] = buf
[2] = buf
[3] = 0;
750 return(write_data(client
,(char *)buf
,4) == 4);
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
758 Timeout is in milliseconds.
759 ****************************************************************************/
761 NTSTATUS
read_smb_length_return_keepalive(int fd
, char *inbuf
,
762 unsigned int timeout
,
768 status
= read_socket_with_timeout(fd
, inbuf
, 4, 4, timeout
, NULL
);
770 if (!NT_STATUS_IS_OK(status
)) {
774 *len
= smb_len(inbuf
);
775 msg_type
= CVAL(inbuf
,0);
777 if (msg_type
== SMBkeepalive
) {
778 DEBUG(5,("Got keepalive packet\n"));
781 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len
)));
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 ****************************************************************************/
793 NTSTATUS
read_smb_length(int fd
, char *inbuf
, unsigned int timeout
,
796 uint8_t msgtype
= SMBkeepalive
;
798 while (msgtype
== SMBkeepalive
) {
801 status
= read_smb_length_return_keepalive(fd
, inbuf
, timeout
,
803 if (!NT_STATUS_IS_OK(status
)) {
807 msgtype
= CVAL(inbuf
, 0);
810 DEBUG(10,("read_smb_length: got smb length of %lu\n",
811 (unsigned long)len
));
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 ****************************************************************************/
825 NTSTATUS
receive_smb_raw(int fd
, char *buffer
, size_t buflen
, unsigned int timeout
,
826 size_t maxlen
, size_t *p_len
)
831 status
= read_smb_length_return_keepalive(fd
,buffer
,timeout
,&len
);
833 if (!NT_STATUS_IS_OK(status
)) {
834 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status
)));
839 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
840 (unsigned long)len
));
841 return NT_STATUS_INVALID_PARAMETER
;
846 len
= MIN(len
,maxlen
);
849 status
= read_socket_with_timeout(
850 fd
, buffer
+4, len
, len
, timeout
, &len
);
852 if (!NT_STATUS_IS_OK(status
)) {
856 /* not all of samba3 properly checks for packet-termination
857 * of strings. This ensures that we don't run off into
859 SSVAL(buffer
+4,len
, 0);
866 /****************************************************************************
867 Open a socket of the specified type, port, and address for incoming data.
868 ****************************************************************************/
870 int open_socket_in(int type
,
873 const struct sockaddr_storage
*psock
,
876 struct sockaddr_storage sock
;
878 socklen_t slen
= sizeof(struct sockaddr_in
);
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
);
888 if (sock
.ss_family
== AF_INET
) {
889 ((struct sockaddr_in
*)&sock
)->sin_port
= htons(port
);
892 res
= socket(sock
.ss_family
, type
, 0 );
895 dbgtext( "open_socket_in(): socket() call failed: " );
896 dbgtext( "%s\n", strerror( errno
) );
901 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
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
) );
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 ",
921 dbgtext( "on port %d failed ", port
);
922 dbgtext( "with error = %s\n", strerror(errno
));
925 #endif /* SO_REUSEPORT */
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
),
935 dbgtext( "bind failed on port %d ", port
);
936 dbgtext( "socket_addr = %s.\n", addr
);
937 dbgtext( "Error = %s\n", strerror(errno
));
943 DEBUG( 10, ( "bind succeeded on port %d\n", port
) );
947 struct open_socket_out_state
{
949 struct event_context
*ev
;
950 struct sockaddr_storage ss
;
956 static void open_socket_out_connected(struct async_req
*subreq
);
958 static int open_socket_out_state_destructor(struct open_socket_out_state
*s
)
966 /****************************************************************************
967 Create an outgoing socket. timeout is in milliseconds.
968 **************************************************************************/
970 struct async_req
*open_socket_out_send(TALLOC_CTX
*mem_ctx
,
971 struct event_context
*ev
,
972 const struct sockaddr_storage
*pss
,
976 char addr
[INET6_ADDRSTRLEN
];
977 struct async_req
*result
, *subreq
;
978 struct open_socket_out_state
*state
;
981 if (!async_req_setup(mem_ctx
, &result
, &state
,
982 struct open_socket_out_state
)) {
988 state
->wait_nsec
= 10000;
991 state
->fd
= socket(state
->ss
.ss_family
, SOCK_STREAM
, 0);
992 if (state
->fd
== -1) {
993 status
= map_nt_error_from_unix(errno
);
996 talloc_set_destructor(state
, open_socket_out_state_destructor
);
998 if (!async_req_set_timeout(result
, ev
, timeval_set(0, timeout
*1000))) {
1002 #if defined(HAVE_IPV6)
1003 if (pss
->ss_family
== AF_INET6
) {
1004 struct sockaddr_in6
*psa6
;
1005 psa6
= (struct sockaddr_in6
*)&state
->ss
;
1006 psa6
->sin6_port
= htons(port
);
1007 if (psa6
->sin6_scope_id
== 0
1008 && IN6_IS_ADDR_LINKLOCAL(&psa6
->sin6_addr
)) {
1009 setup_linklocal_scope_id(
1010 (struct sockaddr
*)&(state
->ss
));
1012 state
->salen
= sizeof(struct sockaddr_in6
);
1015 if (pss
->ss_family
== AF_INET
) {
1016 struct sockaddr_in
*psa
;
1017 psa
= (struct sockaddr_in
*)&state
->ss
;
1018 psa
->sin_port
= htons(port
);
1019 state
->salen
= sizeof(struct sockaddr_in
);
1022 print_sockaddr(addr
, sizeof(addr
), &state
->ss
);
1023 DEBUG(3,("Connecting to %s at port %u\n", addr
, (unsigned int)port
));
1025 subreq
= async_connect_send(state
, state
->ev
, state
->fd
,
1026 (struct sockaddr
*)&state
->ss
,
1028 if ((subreq
== NULL
)
1029 || !async_req_set_timeout(subreq
, state
->ev
,
1030 timeval_set(0, state
->wait_nsec
))) {
1031 status
= NT_STATUS_NO_MEMORY
;
1034 subreq
->async
.fn
= open_socket_out_connected
;
1035 subreq
->async
.priv
= result
;
1039 if (!async_post_ntstatus(result
, ev
, status
)) {
1044 TALLOC_FREE(result
);
1048 static void open_socket_out_connected(struct async_req
*subreq
)
1050 struct async_req
*req
= talloc_get_type_abort(
1051 subreq
->async
.priv
, struct async_req
);
1052 struct open_socket_out_state
*state
= talloc_get_type_abort(
1053 req
->private_data
, struct open_socket_out_state
);
1057 status
= async_connect_recv(subreq
, &sys_errno
);
1058 TALLOC_FREE(subreq
);
1059 if (NT_STATUS_IS_OK(status
)) {
1060 async_req_done(req
);
1064 if (NT_STATUS_EQUAL(status
, NT_STATUS_IO_TIMEOUT
)
1065 || (sys_errno
== EINPROGRESS
)
1066 || (sys_errno
== EALREADY
)
1067 || (sys_errno
== EAGAIN
)) {
1073 if (state
->wait_nsec
< 250000) {
1074 state
->wait_nsec
*= 1.5;
1077 subreq
= async_connect_send(state
, state
->ev
, state
->fd
,
1078 (struct sockaddr
*)&state
->ss
,
1080 if (async_req_ntnomem(subreq
, req
)) {
1083 if (!async_req_set_timeout(subreq
, state
->ev
,
1084 timeval_set(0, state
->wait_nsec
))) {
1085 async_req_nterror(req
, NT_STATUS_NO_MEMORY
);
1088 subreq
->async
.fn
= open_socket_out_connected
;
1089 subreq
->async
.priv
= req
;
1094 if (sys_errno
== EISCONN
) {
1095 async_req_done(req
);
1101 async_req_nterror(req
, map_nt_error_from_unix(sys_errno
));
1104 NTSTATUS
open_socket_out_recv(struct async_req
*req
, int *pfd
)
1106 struct open_socket_out_state
*state
= talloc_get_type_abort(
1107 req
->private_data
, struct open_socket_out_state
);
1110 if (async_req_is_nterror(req
, &status
)) {
1115 return NT_STATUS_OK
;
1118 NTSTATUS
open_socket_out(const struct sockaddr_storage
*pss
, uint16_t port
,
1119 int timeout
, int *pfd
)
1121 TALLOC_CTX
*frame
= talloc_stackframe();
1122 struct event_context
*ev
;
1123 struct async_req
*req
;
1124 NTSTATUS status
= NT_STATUS_NO_MEMORY
;
1126 ev
= event_context_init(frame
);
1131 req
= open_socket_out_send(frame
, ev
, pss
, port
, timeout
);
1135 while (req
->state
< ASYNC_REQ_DONE
) {
1136 event_loop_once(ev
);
1139 status
= open_socket_out_recv(req
, pfd
);
1145 struct open_socket_out_defer_state
{
1146 struct event_context
*ev
;
1147 struct sockaddr_storage ss
;
1153 static void open_socket_out_defer_waited(struct async_req
*subreq
);
1154 static void open_socket_out_defer_connected(struct async_req
*subreq
);
1156 struct async_req
*open_socket_out_defer_send(TALLOC_CTX
*mem_ctx
,
1157 struct event_context
*ev
,
1158 struct timeval wait_time
,
1159 const struct sockaddr_storage
*pss
,
1163 struct async_req
*result
, *subreq
;
1164 struct open_socket_out_defer_state
*state
;
1167 if (!async_req_setup(mem_ctx
, &result
, &state
,
1168 struct open_socket_out_defer_state
)) {
1174 state
->timeout
= timeout
;
1176 subreq
= async_wait_send(state
, ev
, wait_time
);
1177 if (subreq
== NULL
) {
1178 status
= NT_STATUS_NO_MEMORY
;
1181 subreq
->async
.fn
= open_socket_out_defer_waited
;
1182 subreq
->async
.priv
= result
;
1186 if (!async_post_ntstatus(result
, ev
, status
)) {
1191 TALLOC_FREE(result
);
1195 static void open_socket_out_defer_waited(struct async_req
*subreq
)
1197 struct async_req
*req
= talloc_get_type_abort(
1198 subreq
->async
.priv
, struct async_req
);
1199 struct open_socket_out_defer_state
*state
= talloc_get_type_abort(
1200 req
->private_data
, struct open_socket_out_defer_state
);
1203 ret
= async_wait_recv(subreq
);
1204 TALLOC_FREE(subreq
);
1206 async_req_nterror(req
, NT_STATUS_INTERNAL_ERROR
);
1210 subreq
= open_socket_out_send(state
, state
->ev
, &state
->ss
,
1211 state
->port
, state
->timeout
);
1212 if (async_req_ntnomem(subreq
, req
)) {
1215 subreq
->async
.fn
= open_socket_out_defer_connected
;
1216 subreq
->async
.priv
= req
;
1219 static void open_socket_out_defer_connected(struct async_req
*subreq
)
1221 struct async_req
*req
= talloc_get_type_abort(
1222 subreq
->async
.priv
, struct async_req
);
1223 struct open_socket_out_defer_state
*state
= talloc_get_type_abort(
1224 req
->private_data
, struct open_socket_out_defer_state
);
1227 status
= open_socket_out_recv(subreq
, &state
->fd
);
1228 TALLOC_FREE(subreq
);
1229 if (!NT_STATUS_IS_OK(status
)) {
1230 async_req_nterror(req
, status
);
1233 async_req_done(req
);
1236 NTSTATUS
open_socket_out_defer_recv(struct async_req
*req
, int *pfd
)
1238 struct open_socket_out_defer_state
*state
= talloc_get_type_abort(
1239 req
->private_data
, struct open_socket_out_defer_state
);
1242 if (async_req_is_nterror(req
, &status
)) {
1247 return NT_STATUS_OK
;
1250 /*******************************************************************
1251 Create an outgoing TCP socket to the first addr that connects.
1253 This is for simultaneous connection attempts to port 445 and 139 of a host
1254 or for simultatneous connection attempts to multiple DCs at once. We return
1255 a socket fd of the first successful connection.
1257 @param[in] addrs list of Internet addresses and ports to connect to
1258 @param[in] num_addrs number of address/port pairs in the addrs list
1259 @param[in] timeout time after which we stop waiting for a socket connection
1260 to succeed, given in milliseconds
1261 @param[out] fd_index the entry in addrs which we successfully connected to
1262 @param[out] fd fd of the open and connected socket
1263 @return true on a successful connection, false if all connection attempts
1264 failed or we timed out
1265 *******************************************************************/
1267 bool open_any_socket_out(struct sockaddr_storage
*addrs
, int num_addrs
,
1268 int timeout
, int *fd_index
, int *fd
)
1270 int i
, resulting_index
, res
;
1274 fd_set r_fds
, wr_fds
;
1278 int connect_loop
= 10000; /* 10 milliseconds */
1280 timeout
*= 1000; /* convert to microseconds */
1282 sockets
= SMB_MALLOC_ARRAY(int, num_addrs
);
1284 if (sockets
== NULL
)
1287 resulting_index
= -1;
1289 for (i
=0; i
<num_addrs
; i
++)
1292 for (i
=0; i
<num_addrs
; i
++) {
1293 sockets
[i
] = socket(addrs
[i
].ss_family
, SOCK_STREAM
, 0);
1296 set_blocking(sockets
[i
], false);
1300 good_connect
= false;
1302 for (i
=0; i
<num_addrs
; i
++) {
1303 const struct sockaddr
* a
=
1304 (const struct sockaddr
*)&(addrs
[i
]);
1306 if (sockets
[i
] == -1)
1309 if (sys_connect(sockets
[i
], a
) == 0) {
1310 /* Rather unlikely as we are non-blocking, but it
1311 * might actually happen. */
1312 resulting_index
= i
;
1316 if (errno
== EINPROGRESS
|| errno
== EALREADY
||
1320 errno
== EAGAIN
|| errno
== EINTR
) {
1321 /* These are the error messages that something is
1323 good_connect
= true;
1324 } else if (errno
!= 0) {
1325 /* There was a direct error */
1331 if (!good_connect
) {
1332 /* All of the connect's resulted in real error conditions */
1336 /* Lets see if any of the connect attempts succeeded */
1342 for (i
=0; i
<num_addrs
; i
++) {
1343 if (sockets
[i
] == -1)
1345 FD_SET(sockets
[i
], &wr_fds
);
1346 FD_SET(sockets
[i
], &r_fds
);
1347 if (sockets
[i
]>maxfd
)
1352 tv
.tv_usec
= connect_loop
;
1354 res
= sys_select_intr(maxfd
+1, &r_fds
, &wr_fds
, NULL
, &tv
);
1362 for (i
=0; i
<num_addrs
; i
++) {
1364 if (sockets
[i
] == -1)
1367 /* Stevens, Network Programming says that if there's a
1368 * successful connect, the socket is only writable. Upon an
1369 * error, it's both readable and writable. */
1371 if (FD_ISSET(sockets
[i
], &r_fds
) &&
1372 FD_ISSET(sockets
[i
], &wr_fds
)) {
1373 /* readable and writable, so it's an error */
1379 if (!FD_ISSET(sockets
[i
], &r_fds
) &&
1380 FD_ISSET(sockets
[i
], &wr_fds
)) {
1381 /* Only writable, so it's connected */
1382 resulting_index
= i
;
1389 timeout
-= connect_loop
;
1392 connect_loop
*= 1.5;
1393 if (connect_loop
> timeout
)
1394 connect_loop
= timeout
;
1398 for (i
=0; i
<num_addrs
; i
++) {
1399 if (i
== resulting_index
)
1401 if (sockets
[i
] >= 0)
1405 if (resulting_index
>= 0) {
1406 *fd_index
= resulting_index
;
1407 *fd
= sockets
[*fd_index
];
1408 set_blocking(*fd
, true);
1413 return (resulting_index
>= 0);
1415 /****************************************************************************
1416 Open a connected UDP socket to host on port
1417 **************************************************************************/
1419 int open_udp_socket(const char *host
, int port
)
1421 int type
= SOCK_DGRAM
;
1422 struct sockaddr_in sock_out
;
1424 struct in_addr addr
;
1426 addr
= interpret_addr2(host
);
1428 res
= socket(PF_INET
, type
, 0);
1433 memset((char *)&sock_out
,'\0',sizeof(sock_out
));
1434 putip((char *)&sock_out
.sin_addr
,(char *)&addr
);
1435 sock_out
.sin_port
= htons(port
);
1436 sock_out
.sin_family
= PF_INET
;
1438 if (sys_connect(res
,(struct sockaddr
*)&sock_out
)) {
1446 /*******************************************************************
1447 Return the IP addr of the remote end of a socket as a string.
1448 Optionally return the struct sockaddr_storage.
1449 ******************************************************************/
1451 static const char *get_peer_addr_internal(int fd
,
1453 size_t addr_buf_len
,
1454 struct sockaddr
*pss
,
1457 struct sockaddr_storage ss
;
1458 socklen_t length
= sizeof(ss
);
1460 strlcpy(addr_buf
,"0.0.0.0",addr_buf_len
);
1467 pss
= (struct sockaddr
*)&ss
;
1471 if (getpeername(fd
, (struct sockaddr
*)pss
, plength
) < 0) {
1472 DEBUG(0,("getpeername failed. Error was %s\n",
1477 print_sockaddr_len(addr_buf
,
1484 /*******************************************************************
1485 Matchname - determine if host name matches IP address. Used to
1486 confirm a hostname lookup to prevent spoof attacks.
1487 ******************************************************************/
1489 static bool matchname(const char *remotehost
,
1490 const struct sockaddr
*pss
,
1493 struct addrinfo
*res
= NULL
;
1494 struct addrinfo
*ailist
= NULL
;
1495 char addr_buf
[INET6_ADDRSTRLEN
];
1496 bool ret
= interpret_string_addr_internal(&ailist
,
1498 AI_ADDRCONFIG
|AI_CANONNAME
);
1500 if (!ret
|| ailist
== NULL
) {
1501 DEBUG(3,("matchname: getaddrinfo failed for "
1504 gai_strerror(ret
) ));
1509 * Make sure that getaddrinfo() returns the "correct" host name.
1512 if (ailist
->ai_canonname
== NULL
||
1513 (!strequal(remotehost
, ailist
->ai_canonname
) &&
1514 !strequal(remotehost
, "localhost"))) {
1515 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1517 ailist
->ai_canonname
?
1518 ailist
->ai_canonname
: "(NULL)"));
1519 freeaddrinfo(ailist
);
1523 /* Look up the host address in the address list we just got. */
1524 for (res
= ailist
; res
; res
= res
->ai_next
) {
1525 if (!res
->ai_addr
) {
1528 if (sockaddr_equal((const struct sockaddr
*)res
->ai_addr
,
1529 (struct sockaddr
*)pss
)) {
1530 freeaddrinfo(ailist
);
1536 * The host name does not map to the original host address. Perhaps
1537 * someone has compromised a name server. More likely someone botched
1538 * it, but that could be dangerous, too.
1541 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1542 print_sockaddr_len(addr_buf
,
1546 ailist
->ai_canonname
? ailist
->ai_canonname
: "(NULL)"));
1549 freeaddrinfo(ailist
);
1554 /*******************************************************************
1555 Deal with the singleton cache.
1556 ******************************************************************/
1558 struct name_addr_pair
{
1559 struct sockaddr_storage ss
;
1563 /*******************************************************************
1564 Lookup a name/addr pair. Returns memory allocated from memcache.
1565 ******************************************************************/
1567 static bool lookup_nc(struct name_addr_pair
*nc
)
1573 if (!memcache_lookup(
1574 NULL
, SINGLETON_CACHE
,
1575 data_blob_string_const_null("get_peer_name"),
1580 memcpy(&nc
->ss
, tmp
.data
, sizeof(nc
->ss
));
1581 nc
->name
= (const char *)tmp
.data
+ sizeof(nc
->ss
);
1585 /*******************************************************************
1586 Save a name/addr pair.
1587 ******************************************************************/
1589 static void store_nc(const struct name_addr_pair
*nc
)
1592 size_t namelen
= strlen(nc
->name
);
1594 tmp
= data_blob(NULL
, sizeof(nc
->ss
) + namelen
+ 1);
1598 memcpy(tmp
.data
, &nc
->ss
, sizeof(nc
->ss
));
1599 memcpy(tmp
.data
+sizeof(nc
->ss
), nc
->name
, namelen
+1);
1601 memcache_add(NULL
, SINGLETON_CACHE
,
1602 data_blob_string_const_null("get_peer_name"),
1604 data_blob_free(&tmp
);
1607 /*******************************************************************
1608 Return the DNS name of the remote end of a socket.
1609 ******************************************************************/
1611 const char *get_peer_name(int fd
, bool force_lookup
)
1613 struct name_addr_pair nc
;
1614 char addr_buf
[INET6_ADDRSTRLEN
];
1615 struct sockaddr_storage ss
;
1616 socklen_t length
= sizeof(ss
);
1619 char name_buf
[MAX_DNS_NAME_LENGTH
];
1620 char tmp_name
[MAX_DNS_NAME_LENGTH
];
1622 /* reverse lookups can be *very* expensive, and in many
1623 situations won't work because many networks don't link dhcp
1624 with dns. To avoid the delay we avoid the lookup if
1626 if (!lp_hostname_lookups() && (force_lookup
== false)) {
1627 length
= sizeof(nc
.ss
);
1628 nc
.name
= get_peer_addr_internal(fd
, addr_buf
, sizeof(addr_buf
),
1629 (struct sockaddr
*)&nc
.ss
, &length
);
1632 return nc
.name
? nc
.name
: "UNKNOWN";
1637 memset(&ss
, '\0', sizeof(ss
));
1638 p
= get_peer_addr_internal(fd
, addr_buf
, sizeof(addr_buf
), (struct sockaddr
*)&ss
, &length
);
1640 /* it might be the same as the last one - save some DNS work */
1641 if (sockaddr_equal((struct sockaddr
*)&ss
, (struct sockaddr
*)&nc
.ss
)) {
1642 return nc
.name
? nc
.name
: "UNKNOWN";
1645 /* Not the same. We need to lookup. */
1650 /* Look up the remote host name. */
1651 ret
= sys_getnameinfo((struct sockaddr
*)&ss
,
1660 DEBUG(1,("get_peer_name: getnameinfo failed "
1661 "for %s with error %s\n",
1663 gai_strerror(ret
)));
1664 strlcpy(name_buf
, p
, sizeof(name_buf
));
1666 if (!matchname(name_buf
, (struct sockaddr
*)&ss
, length
)) {
1667 DEBUG(0,("Matchname failed on %s %s\n",name_buf
,p
));
1668 strlcpy(name_buf
,"UNKNOWN",sizeof(name_buf
));
1672 /* can't pass the same source and dest strings in when you
1673 use --enable-developer or the clobber_region() call will
1676 strlcpy(tmp_name
, name_buf
, sizeof(tmp_name
));
1677 alpha_strcpy(name_buf
, tmp_name
, "_-.", sizeof(name_buf
));
1678 if (strstr(name_buf
,"..")) {
1679 strlcpy(name_buf
, "UNKNOWN", sizeof(name_buf
));
1687 return nc
.name
? nc
.name
: "UNKNOWN";
1690 /*******************************************************************
1691 Return the IP addr of the remote end of a socket as a string.
1692 ******************************************************************/
1694 const char *get_peer_addr(int fd
, char *addr
, size_t addr_len
)
1696 return get_peer_addr_internal(fd
, addr
, addr_len
, NULL
, NULL
);
1699 /*******************************************************************
1700 Create protected unix domain socket.
1702 Some unixes cannot set permissions on a ux-dom-sock, so we
1703 have to make sure that the directory contains the protection
1704 permissions instead.
1705 ******************************************************************/
1707 int create_pipe_sock(const char *socket_dir
,
1708 const char *socket_name
,
1711 #ifdef HAVE_UNIXSOCKET
1712 struct sockaddr_un sunaddr
;
1718 old_umask
= umask(0);
1720 /* Create the socket directory or reuse the existing one */
1722 if (lstat(socket_dir
, &st
) == -1) {
1723 if (errno
== ENOENT
) {
1724 /* Create directory */
1725 if (mkdir(socket_dir
, dir_perms
) == -1) {
1726 DEBUG(0, ("error creating socket directory "
1727 "%s: %s\n", socket_dir
,
1732 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1733 socket_dir
, strerror(errno
)));
1737 /* Check ownership and permission on existing directory */
1738 if (!S_ISDIR(st
.st_mode
)) {
1739 DEBUG(0, ("socket directory %s isn't a directory\n",
1743 if ((st
.st_uid
!= sec_initial_uid()) ||
1744 ((st
.st_mode
& 0777) != dir_perms
)) {
1745 DEBUG(0, ("invalid permissions on socket directory "
1746 "%s\n", socket_dir
));
1751 /* Create the socket file */
1753 sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
1756 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1761 if (asprintf(&path
, "%s/%s", socket_dir
, socket_name
) == -1) {
1766 memset(&sunaddr
, 0, sizeof(sunaddr
));
1767 sunaddr
.sun_family
= AF_UNIX
;
1768 strlcpy(sunaddr
.sun_path
, path
, sizeof(sunaddr
.sun_path
));
1770 if (bind(sock
, (struct sockaddr
*)&sunaddr
, sizeof(sunaddr
)) == -1) {
1771 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path
,
1776 if (listen(sock
, 5) == -1) {
1777 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path
,
1797 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1799 #endif /* HAVE_UNIXSOCKET */
1802 /****************************************************************************
1803 Get my own canonical name, including domain.
1804 ****************************************************************************/
1806 const char *get_mydnsfullname(void)
1808 struct addrinfo
*res
= NULL
;
1809 char my_hostname
[HOST_NAME_MAX
];
1813 if (memcache_lookup(NULL
, SINGLETON_CACHE
,
1814 data_blob_string_const_null("get_mydnsfullname"),
1816 SMB_ASSERT(tmp
.length
> 0);
1817 return (const char *)tmp
.data
;
1820 /* get my host name */
1821 if (gethostname(my_hostname
, sizeof(my_hostname
)) == -1) {
1822 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1826 /* Ensure null termination. */
1827 my_hostname
[sizeof(my_hostname
)-1] = '\0';
1829 ret
= interpret_string_addr_internal(&res
,
1831 AI_ADDRCONFIG
|AI_CANONNAME
);
1833 if (!ret
|| res
== NULL
) {
1834 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1837 gai_strerror(ret
) ));
1842 * Make sure that getaddrinfo() returns the "correct" host name.
1845 if (res
->ai_canonname
== NULL
) {
1846 DEBUG(3,("get_mydnsfullname: failed to get "
1847 "canonical name for %s\n",
1853 /* This copies the data, so we must do a lookup
1854 * afterwards to find the value to return.
1857 memcache_add(NULL
, SINGLETON_CACHE
,
1858 data_blob_string_const_null("get_mydnsfullname"),
1859 data_blob_string_const_null(res
->ai_canonname
));
1861 if (!memcache_lookup(NULL
, SINGLETON_CACHE
,
1862 data_blob_string_const_null("get_mydnsfullname"),
1864 tmp
= data_blob_talloc(talloc_tos(), res
->ai_canonname
,
1865 strlen(res
->ai_canonname
) + 1);
1870 return (const char *)tmp
.data
;
1873 /************************************************************
1875 ************************************************************/
1877 bool is_myname_or_ipaddr(const char *s
)
1879 TALLOC_CTX
*ctx
= talloc_tos();
1880 char addr
[INET6_ADDRSTRLEN
];
1882 const char *dnsname
;
1883 char *servername
= NULL
;
1889 /* Santize the string from '\\name' */
1890 name
= talloc_strdup(ctx
, s
);
1895 servername
= strrchr_m(name
, '\\' );
1902 /* Optimize for the common case */
1903 if (strequal(servername
, global_myname())) {
1907 /* Check for an alias */
1908 if (is_myname(servername
)) {
1912 /* Check for loopback */
1913 if (strequal(servername
, "127.0.0.1") ||
1914 strequal(servername
, "::1")) {
1918 if (strequal(servername
, "localhost")) {
1922 /* Maybe it's my dns name */
1923 dnsname
= get_mydnsfullname();
1924 if (dnsname
&& strequal(servername
, dnsname
)) {
1928 /* Handle possible CNAME records - convert to an IP addr. */
1929 if (!is_ipaddress(servername
)) {
1930 /* Use DNS to resolve the name, but only the first address */
1931 struct sockaddr_storage ss
;
1932 if (interpret_string_addr(&ss
, servername
, 0)) {
1933 print_sockaddr(addr
,
1940 /* Maybe its an IP address? */
1941 if (is_ipaddress(servername
)) {
1942 struct sockaddr_storage ss
;
1943 struct iface_struct
*nics
;
1946 if (!interpret_string_addr(&ss
, servername
, AI_NUMERICHOST
)) {
1950 if (is_zero_addr((struct sockaddr
*)&ss
) ||
1951 is_loopback_addr((struct sockaddr
*)&ss
)) {
1955 nics
= TALLOC_ARRAY(ctx
, struct iface_struct
,
1960 n
= get_interfaces(nics
, MAX_INTERFACES
);
1961 for (i
=0; i
<n
; i
++) {
1962 if (sockaddr_equal((struct sockaddr
*)&nics
[i
].ip
, (struct sockaddr
*)&ss
)) {