2 * Unix networking abstraction.
11 #include <sys/types.h>
12 #include <sys/socket.h>
13 #include <sys/ioctl.h>
14 #include <arpa/inet.h>
15 #include <netinet/in.h>
16 #include <netinet/tcp.h>
19 #define DEFINE_PLUG_METHOD_MACROS
24 #define ipv4_is_loopback(addr) (inet_netof(addr) == IN_LOOPBACKNET)
27 struct socket_function_table
*fn
;
28 /* the above variable absolutely *must* be the first in this structure */
36 int frozen
; /* this causes readability notifications to be ignored */
37 int frozen_readable
; /* this means we missed at least one readability
38 * notification while we were frozen */
39 int localhost_only
; /* for listening sockets */
42 int oobpending
; /* is there OOB data available to read? */
44 int pending_error
; /* in case send() returns error */
49 * We used to typedef struct Socket_tag *Socket.
51 * Since we have made the networking abstraction slightly more
52 * abstract, Socket no longer means a tcp socket (it could mean
53 * an ssl socket). So now we must use Actual_Socket when we know
54 * we are talking about a tcp socket.
56 typedef struct Socket_tag
*Actual_Socket
;
61 * Which address family this address belongs to. AF_INET for
62 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
63 * resolution has not been done and a simple host name is held
64 * in this SockAddr structure.
68 struct addrinfo
*ai
; /* Address IPv6 style. */
70 unsigned long address
; /* Address IPv4 style. */
72 char hostname
[512]; /* Store an unresolved host name. */
75 static tree234
*sktree
;
77 static void uxsel_tell(Actual_Socket s
);
79 static int cmpfortree(void *av
, void *bv
)
81 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
82 int as
= a
->s
, bs
= b
->s
;
90 static int cmpforsearch(void *av
, void *bv
)
92 Actual_Socket b
= (Actual_Socket
) bv
;
93 int as
= *(int *)av
, bs
= b
->s
;
103 sktree
= newtree234(cmpfortree
);
106 void sk_cleanup(void)
112 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
118 const char *error_string(int error
)
120 return strerror(error
);
123 SockAddr
sk_namelookup(const char *host
, char **canonicalname
)
125 SockAddr ret
= snew(struct SockAddr_tag
);
127 struct addrinfo hints
;
131 struct hostent
*h
= NULL
;
135 /* Clear the structure and default to IPv4. */
136 memset(ret
, 0, sizeof(struct SockAddr_tag
));
137 ret
->family
= 0; /* We set this one when we have resolved the host. */
142 hints
.ai_flags
= AI_CANONNAME
;
143 hints
.ai_family
= AF_UNSPEC
;
144 hints
.ai_socktype
= 0;
145 hints
.ai_protocol
= 0;
146 hints
.ai_addrlen
= 0;
147 hints
.ai_addr
= NULL
;
148 hints
.ai_canonname
= NULL
;
149 hints
.ai_next
= NULL
;
150 err
= getaddrinfo(host
, NULL
, NULL
, &ret
->ai
);
152 ret
->error
= gai_strerror(err
);
155 ret
->family
= ret
->ai
->ai_family
;
157 if (ret
->ai
->ai_canonname
!= NULL
)
158 strncat(realhost
, ret
->ai
->ai_canonname
, sizeof(realhost
) - 1);
160 strncat(realhost
, host
, sizeof(realhost
) - 1);
162 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
164 * Otherwise use the IPv4-only gethostbyname... (NOTE:
165 * we don't use gethostbyname as a fallback!)
167 if (ret
->family
== 0) {
168 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
169 if ( (h
= gethostbyname(host
)) )
170 ret
->family
= AF_INET
;
172 if (ret
->family
== 0) {
173 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
174 h_errno
== NO_DATA
||
175 h_errno
== NO_ADDRESS ?
"Host does not exist" :
176 h_errno
== TRY_AGAIN ?
177 "Temporary name service failure" :
178 "gethostbyname: unknown error");
181 memcpy(&a
, h
->h_addr
, sizeof(a
));
182 /* This way we are always sure the h->h_name is valid :) */
183 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
186 * This must be a numeric IPv4 address because it caused a
187 * success return from inet_addr.
189 ret
->family
= AF_INET
;
190 strncpy(realhost
, host
, sizeof(realhost
));
192 ret
->address
= ntohl(a
);
194 realhost
[lenof(realhost
)-1] = '\0';
195 *canonicalname
= snewn(1+strlen(realhost
), char);
196 strcpy(*canonicalname
, realhost
);
200 SockAddr
sk_nonamelookup(const char *host
)
202 SockAddr ret
= snew(struct SockAddr_tag
);
204 ret
->family
= AF_UNSPEC
;
205 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
206 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
210 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
213 if (addr
->family
== AF_UNSPEC
) {
214 strncpy(buf
, addr
->hostname
, buflen
);
215 buf
[buflen
-1] = '\0';
218 if (getnameinfo(addr
->ai
->ai_addr
, addr
->ai
->ai_addrlen
, buf
, buflen
,
219 NULL
, 0, NI_NUMERICHOST
) != 0) {
221 strncat(buf
, "<unknown>", buflen
- 1);
225 assert(addr
->family
== AF_INET
);
226 a
.s_addr
= htonl(addr
->address
);
227 strncpy(buf
, inet_ntoa(a
), buflen
);
228 buf
[buflen
-1] = '\0';
233 int sk_hostname_is_local(char *name
)
235 return !strcmp(name
, "localhost");
238 int sk_address_is_local(SockAddr addr
)
241 if (addr
->family
== AF_UNSPEC
)
242 return 0; /* we don't know; assume not */
245 if (addr
->family
== AF_INET
)
246 return ipv4_is_loopback(
247 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
);
248 else if (addr
->family
== AF_INET6
)
249 return IN6_IS_ADDR_LOOPBACK(
250 &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
);
255 assert(addr
->family
== AF_INET
);
256 a
.s_addr
= htonl(addr
->address
);
257 return ipv4_is_loopback(a
);
262 int sk_addrtype(SockAddr addr
)
264 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
:
266 addr
->family
== AF_INET6 ? ADDRTYPE_IPV6
:
271 void sk_addrcopy(SockAddr addr
, char *buf
)
275 if (addr
->family
== AF_INET
)
276 memcpy(buf
, &((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
,
277 sizeof(struct in_addr
));
278 else if (addr
->family
== AF_INET6
)
279 memcpy(buf
, &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
,
280 sizeof(struct in6_addr
));
286 assert(addr
->family
== AF_INET
);
287 a
.s_addr
= htonl(addr
->address
);
288 memcpy(buf
, (char*) &a
.s_addr
, 4);
292 void sk_addr_free(SockAddr addr
)
296 if (addr
->ai
!= NULL
)
297 freeaddrinfo(addr
->ai
);
302 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
304 Actual_Socket s
= (Actual_Socket
) sock
;
311 static void sk_tcp_flush(Socket s
)
314 * We send data to the socket as soon as we can anyway,
315 * so we don't need to do anything here. :-)
319 static void sk_tcp_close(Socket s
);
320 static int sk_tcp_write(Socket s
, const char *data
, int len
);
321 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
322 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
323 static void *sk_tcp_get_private_ptr(Socket s
);
324 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
325 static const char *sk_tcp_socket_error(Socket s
);
327 static struct socket_function_table tcp_fn_table
= {
333 sk_tcp_set_private_ptr
,
334 sk_tcp_get_private_ptr
,
339 Socket
sk_register(OSSocket sockfd
, Plug plug
)
344 * Create Socket structure.
346 ret
= snew(struct Socket_tag
);
347 ret
->fn
= &tcp_fn_table
;
350 bufchain_init(&ret
->output_data
);
351 ret
->writable
= 1; /* to start with */
352 ret
->sending_oob
= 0;
354 ret
->frozen_readable
= 0;
355 ret
->localhost_only
= 0; /* unused, but best init anyway */
356 ret
->pending_error
= 0;
357 ret
->oobpending
= FALSE
;
363 ret
->error
= error_string(errno
);
375 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
376 int nodelay
, Plug plug
)
380 struct sockaddr_in6 a6
;
382 struct sockaddr_in a
;
389 * Create Socket structure.
391 ret
= snew(struct Socket_tag
);
392 ret
->fn
= &tcp_fn_table
;
395 bufchain_init(&ret
->output_data
);
396 ret
->connected
= 0; /* to start with */
397 ret
->writable
= 0; /* to start with */
398 ret
->sending_oob
= 0;
400 ret
->frozen_readable
= 0;
401 ret
->localhost_only
= 0; /* unused, but best init anyway */
402 ret
->pending_error
= 0;
403 ret
->oobpending
= FALSE
;
409 assert(addr
->family
!= AF_UNSPEC
);
410 s
= socket(addr
->family
, SOCK_STREAM
, 0);
414 ret
->error
= error_string(errno
);
418 ret
->oobinline
= oobinline
;
421 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
426 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
430 * Bind to local address.
433 localport
= 1023; /* count from 1023 downwards */
435 localport
= 0; /* just use port 0 (ie kernel picks) */
437 /* Loop round trying to bind */
442 if (addr
->family
== AF_INET6
) {
443 /* XXX use getaddrinfo to get a local address? */
444 a6
.sin6_family
= AF_INET6
;
445 a6
.sin6_addr
= in6addr_any
;
446 a6
.sin6_port
= htons(localport
);
447 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
451 assert(addr
->family
== AF_INET
);
452 a
.sin_family
= AF_INET
;
453 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
454 a
.sin_port
= htons(localport
);
455 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
462 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
467 break; /* we're only looping once */
470 break; /* we might have got to the end */
474 ret
->error
= error_string(err
);
479 * Connect to remote address.
482 /* XXX would be better to have got getaddrinfo() to fill in the port. */
483 if (addr
->family
== AF_INET
)
484 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_port
=
487 assert(addr
->family
== AF_INET6
);
488 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_port
=
492 a
.sin_family
= AF_INET
;
493 a
.sin_addr
.s_addr
= htonl(addr
->address
);
494 a
.sin_port
= htons((short) port
);
497 fl
= fcntl(s
, F_GETFL
);
499 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
503 connect(s
, addr
->ai
->ai_addr
, addr
->ai
->ai_addrlen
)
505 connect(s
, (struct sockaddr
*) &a
, sizeof(a
))
508 if ( errno
!= EINPROGRESS
) {
509 ret
->error
= error_string(errno
);
514 * If we _don't_ get EWOULDBLOCK, the connect has completed
515 * and we should set the socket as connected and writable.
527 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
)
532 struct sockaddr_in6 a6
;
534 struct addrinfo hints
, *ai
;
537 struct sockaddr_in a
;
544 * Create Socket structure.
546 ret
= snew(struct Socket_tag
);
547 ret
->fn
= &tcp_fn_table
;
550 bufchain_init(&ret
->output_data
);
551 ret
->writable
= 0; /* to start with */
552 ret
->sending_oob
= 0;
554 ret
->frozen_readable
= 0;
555 ret
->localhost_only
= local_host_only
;
556 ret
->pending_error
= 0;
557 ret
->oobpending
= FALSE
;
563 s
= socket(AF_INET
, SOCK_STREAM
, 0);
567 ret
->error
= error_string(errno
);
573 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
576 hints
.ai_flags
= AI_NUMERICHOST
;
577 hints
.ai_family
= AF_UNSPEC
;
578 hints
.ai_socktype
= 0;
579 hints
.ai_protocol
= 0;
580 hints
.ai_addrlen
= 0;
581 hints
.ai_addr
= NULL
;
582 hints
.ai_canonname
= NULL
;
583 hints
.ai_next
= NULL
;
584 sprintf(portstr
, "%d", port
);
585 if (srcaddr
!= NULL
&& getaddrinfo(srcaddr
, portstr
, &hints
, &ai
) == 0)
586 retcode
= bind(s
, ai
->ai_addr
, ai
->ai_addrlen
);
591 * FIXME: Need two listening sockets, in principle, one for v4
595 a6
.sin6_addr
= in6addr_loopback
;
597 a6
.sin6_addr
= in6addr_any
;
598 a6
.sin6_port
= htons(port
);
604 a
.sin_family
= AF_INET
;
607 * Bind to source address. First try an explicitly
611 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
612 if (a
.sin_addr
.s_addr
!= INADDR_NONE
) {
613 /* Override localhost_only with specified listen addr. */
614 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
620 * ... and failing that, go with one of the standard ones.
624 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
626 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
629 a
.sin_port
= htons((short)port
);
630 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
640 ret
->error
= error_string(err
);
645 if (listen(s
, SOMAXCONN
) < 0) {
647 ret
->error
= error_string(errno
);
657 static void sk_tcp_close(Socket sock
)
659 Actual_Socket s
= (Actual_Socket
) sock
;
667 int sk_getxdmdata(void *sock
, unsigned long *ip
, int *port
)
669 Actual_Socket s
= (Actual_Socket
) sock
;
670 struct sockaddr_in addr
;
674 * We must check that this socket really _is_ an Actual_Socket.
676 if (s
->fn
!= &tcp_fn_table
)
677 return 0; /* failure */
680 * If we ever implement connecting to a local X server through
681 * a Unix socket, we return 0xFFFFFFFF for the IP address and
682 * our current pid for the port. Bizarre, but such is life.
685 addrlen
= sizeof(addr
);
686 if (getsockname(s
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0 ||
687 addr
.sin_family
!= AF_INET
)
690 *ip
= ntohl(addr
.sin_addr
.s_addr
);
691 *port
= ntohs(addr
.sin_port
);
697 * The function which tries to send on a socket once it's deemed
700 void try_send(Actual_Socket s
)
702 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
708 if (s
->sending_oob
) {
709 urgentflag
= MSG_OOB
;
710 len
= s
->sending_oob
;
714 bufchain_prefix(&s
->output_data
, &data
, &len
);
716 nsent
= send(s
->s
, data
, len
, urgentflag
);
717 noise_ultralight(nsent
);
719 err
= (nsent
< 0 ? errno
: 0);
720 if (err
== EWOULDBLOCK
) {
722 * Perfectly normal: we've sent all we can for the moment.
726 } else if (nsent
== 0 ||
727 err
== ECONNABORTED
|| err
== ECONNRESET
) {
729 * If send() returns CONNABORTED or CONNRESET, we
730 * unfortunately can't just call plug_closing(),
731 * because it's quite likely that we're currently
732 * _in_ a call from the code we'd be calling back
733 * to, so we'd have to make half the SSH code
734 * reentrant. Instead we flag a pending error on
735 * the socket, to be dealt with (by calling
736 * plug_closing()) at some suitable future moment.
738 s
->pending_error
= err
;
741 /* We're inside the Unix frontend here, so we know
742 * that the frontend handle is unnecessary. */
743 logevent(NULL
, error_string(err
));
744 fatalbox("%s", error_string(err
));
747 if (s
->sending_oob
) {
749 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
750 s
->sending_oob
= len
- nsent
;
755 bufchain_consume(&s
->output_data
, nsent
);
762 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
764 Actual_Socket s
= (Actual_Socket
) sock
;
767 * Add the data to the buffer list on the socket.
769 bufchain_add(&s
->output_data
, buf
, len
);
772 * Now try sending from the start of the buffer list.
778 * Update the select() status to correctly reflect whether or
779 * not we should be selecting for write.
783 return bufchain_size(&s
->output_data
);
786 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
788 Actual_Socket s
= (Actual_Socket
) sock
;
791 * Replace the buffer list on the socket with the data.
793 bufchain_clear(&s
->output_data
);
794 assert(len
<= sizeof(s
->oobdata
));
795 memcpy(s
->oobdata
, buf
, len
);
796 s
->sending_oob
= len
;
799 * Now try sending from the start of the buffer list.
805 * Update the select() status to correctly reflect whether or
806 * not we should be selecting for write.
810 return s
->sending_oob
;
813 static int net_select_result(int fd
, int event
)
817 char buf
[20480]; /* nice big buffer for plenty of speed */
821 /* Find the Socket structure */
822 s
= find234(sktree
, &fd
, cmpforsearch
);
824 return 1; /* boggle */
826 noise_ultralight(event
);
829 case 4: /* exceptional */
832 * On a non-oobinline socket, this indicates that we
833 * can immediately perform an OOB read and get back OOB
834 * data, which we will send to the back end with
835 * type==2 (urgent data).
837 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
838 noise_ultralight(ret
);
840 const char *str
= (ret
== 0 ?
"Internal networking trouble" :
841 error_string(errno
));
842 /* We're inside the Unix frontend here, so we know
843 * that the frontend handle is unnecessary. */
847 return plug_receive(s
->plug
, 2, buf
, ret
);
853 * If we reach here, this is an oobinline socket, which
854 * means we should set s->oobpending and then deal with it
855 * when we get called for the readability event (which
856 * should also occur).
858 s
->oobpending
= TRUE
;
860 case 1: /* readable; also acceptance */
863 * On a listening socket, the readability event means a
864 * connection is ready to be accepted.
866 struct sockaddr_in isa
;
867 int addrlen
= sizeof(struct sockaddr_in
);
868 int t
; /* socket of connection */
870 memset(&isa
, 0, sizeof(struct sockaddr_in
));
872 t
= accept(s
->s
,(struct sockaddr
*)&isa
,&addrlen
);
877 if (s
->localhost_only
&& !ipv4_is_loopback(isa
.sin_addr
)) {
878 close(t
); /* someone let nonlocal through?! */
879 } else if (plug_accepting(s
->plug
, t
)) {
880 close(t
); /* denied or error */
886 * If we reach here, this is not a listening socket, so
887 * readability really means readability.
890 /* In the case the socket is still frozen, we don't even bother */
892 s
->frozen_readable
= 1;
897 * We have received data on the socket. For an oobinline
898 * socket, this might be data _before_ an urgent pointer,
899 * in which case we send it to the back end with type==1
900 * (data prior to urgent).
902 if (s
->oobinline
&& s
->oobpending
) {
904 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
905 s
->oobpending
= FALSE
; /* clear this indicator */
909 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
910 noise_ultralight(ret
);
912 if (errno
== EWOULDBLOCK
) {
917 return plug_closing(s
->plug
, error_string(errno
), errno
, 0);
918 } else if (0 == ret
) {
919 return plug_closing(s
->plug
, NULL
, 0, 0);
921 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
924 case 2: /* writable */
927 * select() reports a socket as _writable_ when an
928 * asynchronous connection is completed.
930 s
->connected
= s
->writable
= 1;
934 int bufsize_before
, bufsize_after
;
936 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
938 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
939 if (bufsize_after
< bufsize_before
)
940 plug_sent(s
->plug
, bufsize_after
);
949 * Deal with socket errors detected in try_send().
951 void net_pending_errors(void)
957 * This might be a fiddly business, because it's just possible
958 * that handling a pending error on one socket might cause
959 * others to be closed. (I can't think of any reason this might
960 * happen in current SSH implementation, but to maintain
961 * generality of this network layer I'll assume the worst.)
963 * So what we'll do is search the socket list for _one_ socket
964 * with a pending error, and then handle it, and then search
965 * the list again _from the beginning_. Repeat until we make a
966 * pass with no socket errors present. That way we are
967 * protected against the socket list changing under our feet.
971 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
972 if (s
->pending_error
) {
974 * An error has occurred on this socket. Pass it to the
977 plug_closing(s
->plug
, error_string(s
->pending_error
),
978 s
->pending_error
, 0);
986 * Each socket abstraction contains a `void *' private field in
987 * which the client can keep state.
989 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
991 Actual_Socket s
= (Actual_Socket
) sock
;
992 s
->private_ptr
= ptr
;
995 static void *sk_tcp_get_private_ptr(Socket sock
)
997 Actual_Socket s
= (Actual_Socket
) sock
;
998 return s
->private_ptr
;
1002 * Special error values are returned from sk_namelookup and sk_new
1003 * if there's a problem. These functions extract an error message,
1004 * or return NULL if there's no problem.
1006 const char *sk_addr_error(SockAddr addr
)
1010 static const char *sk_tcp_socket_error(Socket sock
)
1012 Actual_Socket s
= (Actual_Socket
) sock
;
1016 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1018 Actual_Socket s
= (Actual_Socket
) sock
;
1019 if (s
->frozen
== is_frozen
)
1021 s
->frozen
= is_frozen
;
1022 if (!is_frozen
&& s
->frozen_readable
) {
1024 recv(s
->s
, &c
, 1, MSG_PEEK
);
1026 s
->frozen_readable
= 0;
1030 static void uxsel_tell(Actual_Socket s
)
1034 rwx
|= 2; /* write == connect */
1035 if (s
->connected
&& !s
->frozen
)
1036 rwx
|= 1 | 4; /* read, except */
1037 if (bufchain_size(&s
->output_data
))
1038 rwx
|= 2; /* write */
1040 rwx
|= 1; /* read == accept */
1041 uxsel_set(s
->s
, rwx
, net_select_result
);
1044 int net_service_lookup(char *service
)
1047 se
= getservbyname(service
, NULL
);
1049 return ntohs(se
->s_port
);