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>
20 #define DEFINE_PLUG_METHOD_MACROS
25 /* Solaris needs <sys/sockio.h> for SIOCATMARK. */
27 #include <sys/sockio.h>
31 # define X11_UNIX_PATH "/tmp/.X11-unix/X"
35 * We used to typedef struct Socket_tag *Socket.
37 * Since we have made the networking abstraction slightly more
38 * abstract, Socket no longer means a tcp socket (it could mean
39 * an ssl socket). So now we must use Actual_Socket when we know
40 * we are talking about a tcp socket.
42 typedef struct Socket_tag
*Actual_Socket
;
45 struct socket_function_table
*fn
;
46 /* the above variable absolutely *must* be the first in this structure */
52 int connected
; /* irrelevant for listening sockets */
54 int frozen
; /* this causes readability notifications to be ignored */
55 int frozen_readable
; /* this means we missed at least one readability
56 * notification while we were frozen */
57 int localhost_only
; /* for listening sockets */
60 int oobpending
; /* is there OOB data available to read? */
62 int pending_error
; /* in case send() returns error */
64 int nodelay
, keepalive
; /* for connect()-type sockets */
65 int privport
, port
; /* and again */
68 * We sometimes need pairs of Socket structures to be linked:
69 * if we are listening on the same IPv6 and v4 port, for
70 * example. So here we define `parent' and `child' pointers to
73 Actual_Socket parent
, child
;
79 * Which address family this address belongs to. AF_INET for
80 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
81 * resolution has not been done and a simple host name is held
82 * in this SockAddr structure.
86 struct addrinfo
*ais
; /* Addresses IPv6 style. */
87 struct addrinfo
*ai
; /* steps along the linked list */
89 unsigned long *addresses
; /* Addresses IPv4 style. */
90 int naddresses
, curraddr
;
92 char hostname
[512]; /* Store an unresolved host name. */
95 static tree234
*sktree
;
97 static void uxsel_tell(Actual_Socket s
);
99 static int cmpfortree(void *av
, void *bv
)
101 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
102 int as
= a
->s
, bs
= b
->s
;
114 static int cmpforsearch(void *av
, void *bv
)
116 Actual_Socket b
= (Actual_Socket
) bv
;
117 int as
= *(int *)av
, bs
= b
->s
;
127 sktree
= newtree234(cmpfortree
);
130 void sk_cleanup(void)
136 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
142 SockAddr
sk_namelookup(const char *host
, char **canonicalname
, int address_family
)
144 SockAddr ret
= snew(struct SockAddr_tag
);
146 struct addrinfo hints
;
150 struct hostent
*h
= NULL
;
155 /* Clear the structure and default to IPv4. */
156 memset(ret
, 0, sizeof(struct SockAddr_tag
));
157 ret
->family
= 0; /* We set this one when we have resolved the host. */
162 hints
.ai_flags
= AI_CANONNAME
;
163 hints
.ai_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
164 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
166 hints
.ai_socktype
= SOCK_STREAM
;
167 hints
.ai_protocol
= 0;
168 hints
.ai_addrlen
= 0;
169 hints
.ai_addr
= NULL
;
170 hints
.ai_canonname
= NULL
;
171 hints
.ai_next
= NULL
;
172 err
= getaddrinfo(host
, NULL
, &hints
, &ret
->ais
);
175 ret
->error
= gai_strerror(err
);
178 ret
->family
= ret
->ai
->ai_family
;
180 if (ret
->ai
->ai_canonname
!= NULL
)
181 strncat(realhost
, ret
->ai
->ai_canonname
, sizeof(realhost
) - 1);
183 strncat(realhost
, host
, sizeof(realhost
) - 1);
185 if ((a
= inet_addr(host
)) == (unsigned long)(in_addr_t
)(-1)) {
187 * Otherwise use the IPv4-only gethostbyname... (NOTE:
188 * we don't use gethostbyname as a fallback!)
190 if (ret
->family
== 0) {
191 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
192 if ( (h
= gethostbyname(host
)) )
193 ret
->family
= AF_INET
;
195 if (ret
->family
== 0) {
196 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
197 h_errno
== NO_DATA
||
198 h_errno
== NO_ADDRESS ?
"Host does not exist" :
199 h_errno
== TRY_AGAIN ?
200 "Temporary name service failure" :
201 "gethostbyname: unknown error");
204 /* This way we are always sure the h->h_name is valid :) */
205 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
206 for (n
= 0; h
->h_addr_list
[n
]; n
++);
207 ret
->addresses
= snewn(n
, unsigned long);
209 for (n
= 0; n
< ret
->naddresses
; n
++) {
210 memcpy(&a
, h
->h_addr_list
[n
], sizeof(a
));
211 ret
->addresses
[n
] = ntohl(a
);
215 * This must be a numeric IPv4 address because it caused a
216 * success return from inet_addr.
218 ret
->family
= AF_INET
;
219 strncpy(realhost
, host
, sizeof(realhost
));
220 ret
->addresses
= snew(unsigned long);
222 ret
->addresses
[0] = ntohl(a
);
226 realhost
[lenof(realhost
)-1] = '\0';
227 *canonicalname
= snewn(1+strlen(realhost
), char);
228 strcpy(*canonicalname
, realhost
);
232 SockAddr
sk_nonamelookup(const char *host
)
234 SockAddr ret
= snew(struct SockAddr_tag
);
236 ret
->family
= AF_UNSPEC
;
237 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
238 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
242 ret
->addresses
= NULL
;
247 static int sk_nextaddr(SockAddr addr
)
250 if (addr
->ai
&& addr
->ai
->ai_next
) {
251 addr
->ai
= addr
->ai
->ai_next
;
252 addr
->family
= addr
->ai
->ai_family
;
257 if (addr
->curraddr
+1 < addr
->naddresses
) {
266 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
269 if (addr
->family
== AF_UNSPEC
) {
270 strncpy(buf
, addr
->hostname
, buflen
);
271 buf
[buflen
-1] = '\0';
274 if (getnameinfo(addr
->ai
->ai_addr
, addr
->ai
->ai_addrlen
, buf
, buflen
,
275 NULL
, 0, NI_NUMERICHOST
) != 0) {
277 strncat(buf
, "<unknown>", buflen
- 1);
281 assert(addr
->family
== AF_INET
);
282 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
283 strncpy(buf
, inet_ntoa(a
), buflen
);
284 buf
[buflen
-1] = '\0';
289 int sk_hostname_is_local(char *name
)
291 return !strcmp(name
, "localhost");
294 #define ipv4_is_loopback(addr) \
295 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
297 static int sockaddr_is_loopback(struct sockaddr
*sa
)
299 struct sockaddr_in
*sin
;
301 struct sockaddr_in6
*sin6
;
304 switch (sa
->sa_family
) {
306 sin
= (struct sockaddr_in
*)sa
;
307 return ipv4_is_loopback(sin
->sin_addr
);
310 sin6
= (struct sockaddr_in6
*)sa
;
311 return IN6_IS_ADDR_LOOPBACK(&sin6
->sin6_addr
);
320 int sk_address_is_local(SockAddr addr
)
323 if (addr
->family
== AF_UNSPEC
)
324 return 0; /* we don't know; assume not */
327 return sockaddr_is_loopback(addr
->ai
->ai_addr
);
330 assert(addr
->family
== AF_INET
);
331 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
332 return ipv4_is_loopback(a
);
337 int sk_addrtype(SockAddr addr
)
339 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
:
341 addr
->family
== AF_INET6 ? ADDRTYPE_IPV6
:
346 void sk_addrcopy(SockAddr addr
, char *buf
)
350 if (addr
->family
== AF_INET
)
351 memcpy(buf
, &((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
,
352 sizeof(struct in_addr
));
353 else if (addr
->family
== AF_INET6
)
354 memcpy(buf
, &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
,
355 sizeof(struct in6_addr
));
361 assert(addr
->family
== AF_INET
);
362 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
363 memcpy(buf
, (char*) &a
.s_addr
, 4);
367 void sk_addr_free(SockAddr addr
)
371 if (addr
->ais
!= NULL
)
372 freeaddrinfo(addr
->ais
);
374 sfree(addr
->addresses
);
379 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
381 Actual_Socket s
= (Actual_Socket
) sock
;
388 static void sk_tcp_flush(Socket s
)
391 * We send data to the socket as soon as we can anyway,
392 * so we don't need to do anything here. :-)
396 static void sk_tcp_close(Socket s
);
397 static int sk_tcp_write(Socket s
, const char *data
, int len
);
398 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
399 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
400 static void *sk_tcp_get_private_ptr(Socket s
);
401 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
402 static const char *sk_tcp_socket_error(Socket s
);
404 static struct socket_function_table tcp_fn_table
= {
410 sk_tcp_set_private_ptr
,
411 sk_tcp_get_private_ptr
,
416 Socket
sk_register(OSSocket sockfd
, Plug plug
)
421 * Create Socket structure.
423 ret
= snew(struct Socket_tag
);
424 ret
->fn
= &tcp_fn_table
;
427 bufchain_init(&ret
->output_data
);
428 ret
->writable
= 1; /* to start with */
429 ret
->sending_oob
= 0;
431 ret
->frozen_readable
= 0;
432 ret
->localhost_only
= 0; /* unused, but best init anyway */
433 ret
->pending_error
= 0;
434 ret
->oobpending
= FALSE
;
436 ret
->parent
= ret
->child
= NULL
;
443 ret
->error
= strerror(errno
);
455 static int try_connect(Actual_Socket sock
)
459 struct sockaddr_in6 a6
;
461 struct sockaddr_in a
;
462 struct sockaddr_un au
;
463 const struct sockaddr
*sa
;
469 * Remove the socket from the tree before we overwrite its
470 * internal socket id, because that forms part of the tree's
471 * sorting criterion. We'll add it back before exiting this
472 * function, whether we changed anything or not.
474 del234(sktree
, sock
);
479 plug_log(sock
->plug
, 0, sock
->addr
, sock
->port
, NULL
, 0);
484 assert(sock
->addr
->family
!= AF_UNSPEC
);
485 s
= socket(sock
->addr
->family
, SOCK_STREAM
, 0);
495 if (sock
->oobinline
) {
497 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
502 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
505 if (sock
->keepalive
) {
507 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
511 * Bind to local address.
514 localport
= 1023; /* count from 1023 downwards */
516 localport
= 0; /* just use port 0 (ie kernel picks) */
518 /* BSD IP stacks need sockaddr_in zeroed before filling in */
519 memset(&a
,'\0',sizeof(struct sockaddr_in
));
521 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
524 /* We don't try to bind to a local address for UNIX domain sockets. (Why
525 * do we bother doing the bind when localport == 0 anyway?) */
526 if(sock
->addr
->family
!= AF_UNIX
) {
527 /* Loop round trying to bind */
532 if (sock
->addr
->family
== AF_INET6
) {
533 /* XXX use getaddrinfo to get a local address? */
534 a6
.sin6_family
= AF_INET6
;
535 a6
.sin6_addr
= in6addr_any
;
536 a6
.sin6_port
= htons(localport
);
537 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
541 assert(sock
->addr
->family
== AF_INET
);
542 a
.sin_family
= AF_INET
;
543 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
544 a
.sin_port
= htons(localport
);
545 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
552 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
557 break; /* we're only looping once */
560 break; /* we might have got to the end */
568 * Connect to remote address.
570 switch(sock
->addr
->family
) {
573 /* XXX would be better to have got getaddrinfo() to fill in the port. */
574 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
576 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
577 salen
= sock
->addr
->ai
->ai_addrlen
;
580 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
582 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
583 salen
= sock
->addr
->ai
->ai_addrlen
;
587 a
.sin_family
= AF_INET
;
588 a
.sin_addr
.s_addr
= htonl(sock
->addr
->addresses
[sock
->addr
->curraddr
]);
589 a
.sin_port
= htons((short) sock
->port
);
590 sa
= (const struct sockaddr
*)&a
;
595 assert(sock
->port
== 0); /* to catch confused people */
596 assert(strlen(sock
->addr
->hostname
) < sizeof au
.sun_path
);
597 memset(&au
, 0, sizeof au
);
598 au
.sun_family
= AF_UNIX
;
599 strcpy(au
.sun_path
, sock
->addr
->hostname
);
600 sa
= (const struct sockaddr
*)&au
;
605 assert(0 && "unknown address family");
606 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
609 fl
= fcntl(s
, F_GETFL
);
611 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
613 if ((connect(s
, sa
, salen
)) < 0) {
614 if ( errno
!= EINPROGRESS
) {
620 * If we _don't_ get EWOULDBLOCK, the connect has completed
621 * and we should set the socket as connected and writable.
632 * No matter what happened, put the socket back in the tree.
634 add234(sktree
, sock
);
637 plug_log(sock
->plug
, 1, sock
->addr
, sock
->port
, strerror(err
), err
);
641 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
642 int nodelay
, int keepalive
, Plug plug
)
648 * Create Socket structure.
650 ret
= snew(struct Socket_tag
);
651 ret
->fn
= &tcp_fn_table
;
654 bufchain_init(&ret
->output_data
);
655 ret
->connected
= 0; /* to start with */
656 ret
->writable
= 0; /* to start with */
657 ret
->sending_oob
= 0;
659 ret
->frozen_readable
= 0;
660 ret
->localhost_only
= 0; /* unused, but best init anyway */
661 ret
->pending_error
= 0;
662 ret
->parent
= ret
->child
= NULL
;
663 ret
->oobpending
= FALSE
;
667 ret
->oobinline
= oobinline
;
668 ret
->nodelay
= nodelay
;
669 ret
->keepalive
= keepalive
;
670 ret
->privport
= privport
;
675 err
= try_connect(ret
);
676 } while (err
&& sk_nextaddr(ret
->addr
));
679 ret
->error
= strerror(err
);
684 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int orig_address_family
)
688 struct addrinfo hints
, *ai
;
690 struct sockaddr_in6 a6
;
692 struct sockaddr
*addr
;
694 struct sockaddr_in a
;
701 * Create Socket structure.
703 ret
= snew(struct Socket_tag
);
704 ret
->fn
= &tcp_fn_table
;
707 bufchain_init(&ret
->output_data
);
708 ret
->writable
= 0; /* to start with */
709 ret
->sending_oob
= 0;
711 ret
->frozen_readable
= 0;
712 ret
->localhost_only
= local_host_only
;
713 ret
->pending_error
= 0;
714 ret
->parent
= ret
->child
= NULL
;
715 ret
->oobpending
= FALSE
;
720 * Translate address_family from platform-independent constants
721 * into local reality.
723 address_family
= (orig_address_family
== ADDRTYPE_IPV4 ? AF_INET
:
725 orig_address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
730 /* Let's default to IPv6.
731 * If the stack doesn't support IPv6, we will fall back to IPv4. */
732 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
734 /* No other choice, default to IPv4 */
735 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
741 s
= socket(address_family
, SOCK_STREAM
, 0);
744 /* If the host doesn't support IPv6 try fallback to IPv4. */
745 if (s
< 0 && address_family
== AF_INET6
) {
746 address_family
= AF_INET
;
747 s
= socket(address_family
, SOCK_STREAM
, 0);
752 ret
->error
= strerror(errno
);
760 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
763 addr
= NULL
; addrlen
= -1; /* placate optimiser */
765 if (srcaddr
!= NULL
) {
767 hints
.ai_flags
= AI_NUMERICHOST
;
768 hints
.ai_family
= address_family
;
769 hints
.ai_socktype
= SOCK_STREAM
;
770 hints
.ai_protocol
= 0;
771 hints
.ai_addrlen
= 0;
772 hints
.ai_addr
= NULL
;
773 hints
.ai_canonname
= NULL
;
774 hints
.ai_next
= NULL
;
775 assert(port
>= 0 && port
<= 99999);
776 sprintf(portstr
, "%d", port
);
777 retcode
= getaddrinfo(srcaddr
, portstr
, &hints
, &ai
);
780 addrlen
= ai
->ai_addrlen
;
783 memset(&a
,'\0',sizeof(struct sockaddr_in
));
784 a
.sin_family
= AF_INET
;
785 a
.sin_port
= htons(port
);
786 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
787 if (a
.sin_addr
.s_addr
!= (in_addr_t
)(-1)) {
788 /* Override localhost_only with specified listen addr. */
789 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
791 addr
= (struct sockaddr
*)&a
;
799 if (address_family
== AF_INET6
) {
800 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
801 a6
.sin6_family
= AF_INET6
;
802 a6
.sin6_port
= htons(port
);
804 a6
.sin6_addr
= in6addr_loopback
;
806 a6
.sin6_addr
= in6addr_any
;
807 addr
= (struct sockaddr
*)&a6
;
808 addrlen
= sizeof(a6
);
812 memset(&a
,'\0',sizeof(struct sockaddr_in
));
813 a
.sin_family
= AF_INET
;
814 a
.sin_port
= htons(port
);
816 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
818 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
819 addr
= (struct sockaddr
*)&a
;
824 retcode
= bind(s
, addr
, addrlen
);
827 ret
->error
= strerror(errno
);
831 if (listen(s
, SOMAXCONN
) < 0) {
833 ret
->error
= strerror(errno
);
839 * If we were given ADDRTYPE_UNSPEC, we must also create an
840 * IPv4 listening socket and link it to this one.
842 if (address_family
== AF_INET6
&& orig_address_family
== ADDRTYPE_UNSPEC
) {
845 other
= (Actual_Socket
) sk_newlistener(srcaddr
, port
, plug
,
846 local_host_only
, ADDRTYPE_IPV4
);
853 /* If we couldn't create a listening socket on IPv4 as well
854 * as IPv6, we must return an error overall. */
857 return (Socket
) other
;
871 static void sk_tcp_close(Socket sock
)
873 Actual_Socket s
= (Actual_Socket
) sock
;
876 sk_tcp_close((Socket
)s
->child
);
882 sk_addr_free(s
->addr
);
886 void *sk_getxdmdata(void *sock
, int *lenp
)
888 Actual_Socket s
= (Actual_Socket
) sock
;
890 struct sockaddr_in addr
;
892 struct sockaddr_storage addr
;
893 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)&addr
;
895 struct sockaddr
*sa
= (struct sockaddr
*)&addr
;
896 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&addr
;
899 static unsigned int unix_addr
= 0xFFFFFFFF;
902 * We must check that this socket really _is_ an Actual_Socket.
904 if (s
->fn
!= &tcp_fn_table
)
905 return NULL
; /* failure */
907 addrlen
= sizeof(addr
);
908 if (getsockname(s
->s
, sa
, &addrlen
) < 0)
910 switch(sa
->sa_family
) {
913 buf
= snewn(*lenp
, char);
914 PUT_32BIT_MSB_FIRST(buf
, ntohl(sin
->sin_addr
.s_addr
));
915 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin
->sin_port
));
920 buf
= snewn(*lenp
, char);
921 if (IN6_IS_ADDR_V4MAPPED(&sin6
->sin6_addr
)) {
922 memcpy(buf
, sin6
->sin6_addr
.s6_addr
+ 12, 4);
923 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin6
->sin6_port
));
925 /* This is stupid, but it's what XLib does. */
931 buf
= snewn(*lenp
, char);
932 PUT_32BIT_MSB_FIRST(buf
, unix_addr
--);
933 PUT_16BIT_MSB_FIRST(buf
+4, getpid());
946 * The function which tries to send on a socket once it's deemed
949 void try_send(Actual_Socket s
)
951 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
957 if (s
->sending_oob
) {
958 urgentflag
= MSG_OOB
;
959 len
= s
->sending_oob
;
963 bufchain_prefix(&s
->output_data
, &data
, &len
);
965 nsent
= send(s
->s
, data
, len
, urgentflag
);
966 noise_ultralight(nsent
);
968 err
= (nsent
< 0 ? errno
: 0);
969 if (err
== EWOULDBLOCK
) {
971 * Perfectly normal: we've sent all we can for the moment.
977 * We unfortunately can't just call plug_closing(),
978 * because it's quite likely that we're currently
979 * _in_ a call from the code we'd be calling back
980 * to, so we'd have to make half the SSH code
981 * reentrant. Instead we flag a pending error on
982 * the socket, to be dealt with (by calling
983 * plug_closing()) at some suitable future moment.
985 s
->pending_error
= err
;
989 if (s
->sending_oob
) {
991 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
992 s
->sending_oob
= len
- nsent
;
997 bufchain_consume(&s
->output_data
, nsent
);
1004 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
1006 Actual_Socket s
= (Actual_Socket
) sock
;
1009 * Add the data to the buffer list on the socket.
1011 bufchain_add(&s
->output_data
, buf
, len
);
1014 * Now try sending from the start of the buffer list.
1020 * Update the select() status to correctly reflect whether or
1021 * not we should be selecting for write.
1025 return bufchain_size(&s
->output_data
);
1028 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
1030 Actual_Socket s
= (Actual_Socket
) sock
;
1033 * Replace the buffer list on the socket with the data.
1035 bufchain_clear(&s
->output_data
);
1036 assert(len
<= sizeof(s
->oobdata
));
1037 memcpy(s
->oobdata
, buf
, len
);
1038 s
->sending_oob
= len
;
1041 * Now try sending from the start of the buffer list.
1047 * Update the select() status to correctly reflect whether or
1048 * not we should be selecting for write.
1052 return s
->sending_oob
;
1055 static int net_select_result(int fd
, int event
)
1058 char buf
[20480]; /* nice big buffer for plenty of speed */
1062 /* Find the Socket structure */
1063 s
= find234(sktree
, &fd
, cmpforsearch
);
1065 return 1; /* boggle */
1067 noise_ultralight(event
);
1070 case 4: /* exceptional */
1071 if (!s
->oobinline
) {
1073 * On a non-oobinline socket, this indicates that we
1074 * can immediately perform an OOB read and get back OOB
1075 * data, which we will send to the back end with
1076 * type==2 (urgent data).
1078 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1079 noise_ultralight(ret
);
1081 return plug_closing(s
->plug
,
1082 ret
== 0 ?
"Internal networking trouble" :
1083 strerror(errno
), errno
, 0);
1086 * Receiving actual data on a socket means we can
1087 * stop falling back through the candidate
1088 * addresses to connect to.
1091 sk_addr_free(s
->addr
);
1094 return plug_receive(s
->plug
, 2, buf
, ret
);
1100 * If we reach here, this is an oobinline socket, which
1101 * means we should set s->oobpending and then deal with it
1102 * when we get called for the readability event (which
1103 * should also occur).
1105 s
->oobpending
= TRUE
;
1107 case 1: /* readable; also acceptance */
1110 * On a listening socket, the readability event means a
1111 * connection is ready to be accepted.
1114 struct sockaddr_in ss
;
1116 struct sockaddr_storage ss
;
1118 socklen_t addrlen
= sizeof(ss
);
1119 int t
; /* socket of connection */
1122 memset(&ss
, 0, addrlen
);
1123 t
= accept(s
->s
, (struct sockaddr
*)&ss
, &addrlen
);
1128 fl
= fcntl(t
, F_GETFL
);
1130 fcntl(t
, F_SETFL
, fl
| O_NONBLOCK
);
1132 if (s
->localhost_only
&&
1133 !sockaddr_is_loopback((struct sockaddr
*)&ss
)) {
1134 close(t
); /* someone let nonlocal through?! */
1135 } else if (plug_accepting(s
->plug
, t
)) {
1136 close(t
); /* denied or error */
1142 * If we reach here, this is not a listening socket, so
1143 * readability really means readability.
1146 /* In the case the socket is still frozen, we don't even bother */
1148 s
->frozen_readable
= 1;
1153 * We have received data on the socket. For an oobinline
1154 * socket, this might be data _before_ an urgent pointer,
1155 * in which case we send it to the back end with type==1
1156 * (data prior to urgent).
1158 if (s
->oobinline
&& s
->oobpending
) {
1160 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
1161 s
->oobpending
= FALSE
; /* clear this indicator */
1165 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
1166 noise_ultralight(ret
);
1168 if (errno
== EWOULDBLOCK
) {
1174 * An error at this point _might_ be an error reported
1175 * by a non-blocking connect(). So before we return a
1176 * panic status to the user, let's just see whether
1181 plug_log(s
->plug
, 1, s
->addr
, s
->port
, strerror(err
), err
);
1182 while (s
->addr
&& sk_nextaddr(s
->addr
)) {
1183 err
= try_connect(s
);
1187 return plug_closing(s
->plug
, strerror(err
), err
, 0);
1188 } else if (0 == ret
) {
1189 return plug_closing(s
->plug
, NULL
, 0, 0);
1192 * Receiving actual data on a socket means we can
1193 * stop falling back through the candidate
1194 * addresses to connect to.
1197 sk_addr_free(s
->addr
);
1200 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1203 case 2: /* writable */
1204 if (!s
->connected
) {
1206 * select() reports a socket as _writable_ when an
1207 * asynchronous connection is completed.
1209 s
->connected
= s
->writable
= 1;
1213 int bufsize_before
, bufsize_after
;
1215 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1217 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1218 if (bufsize_after
< bufsize_before
)
1219 plug_sent(s
->plug
, bufsize_after
);
1228 * Deal with socket errors detected in try_send().
1230 void net_pending_errors(void)
1236 * This might be a fiddly business, because it's just possible
1237 * that handling a pending error on one socket might cause
1238 * others to be closed. (I can't think of any reason this might
1239 * happen in current SSH implementation, but to maintain
1240 * generality of this network layer I'll assume the worst.)
1242 * So what we'll do is search the socket list for _one_ socket
1243 * with a pending error, and then handle it, and then search
1244 * the list again _from the beginning_. Repeat until we make a
1245 * pass with no socket errors present. That way we are
1246 * protected against the socket list changing under our feet.
1250 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1251 if (s
->pending_error
) {
1253 * An error has occurred on this socket. Pass it to the
1256 plug_closing(s
->plug
, strerror(s
->pending_error
),
1257 s
->pending_error
, 0);
1265 * Each socket abstraction contains a `void *' private field in
1266 * which the client can keep state.
1268 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1270 Actual_Socket s
= (Actual_Socket
) sock
;
1271 s
->private_ptr
= ptr
;
1274 static void *sk_tcp_get_private_ptr(Socket sock
)
1276 Actual_Socket s
= (Actual_Socket
) sock
;
1277 return s
->private_ptr
;
1281 * Special error values are returned from sk_namelookup and sk_new
1282 * if there's a problem. These functions extract an error message,
1283 * or return NULL if there's no problem.
1285 const char *sk_addr_error(SockAddr addr
)
1289 static const char *sk_tcp_socket_error(Socket sock
)
1291 Actual_Socket s
= (Actual_Socket
) sock
;
1295 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1297 Actual_Socket s
= (Actual_Socket
) sock
;
1298 if (s
->frozen
== is_frozen
)
1300 s
->frozen
= is_frozen
;
1301 if (!is_frozen
&& s
->frozen_readable
) {
1303 recv(s
->s
, &c
, 1, MSG_PEEK
);
1305 s
->frozen_readable
= 0;
1309 static void uxsel_tell(Actual_Socket s
)
1313 rwx
|= 1; /* read == accept */
1316 rwx
|= 2; /* write == connect */
1317 if (s
->connected
&& !s
->frozen
)
1318 rwx
|= 1 | 4; /* read, except */
1319 if (bufchain_size(&s
->output_data
))
1320 rwx
|= 2; /* write */
1322 uxsel_set(s
->s
, rwx
, net_select_result
);
1325 int net_service_lookup(char *service
)
1328 se
= getservbyname(service
, NULL
);
1330 return ntohs(se
->s_port
);
1335 SockAddr
platform_get_x11_unix_address(const char *display
, int displaynum
,
1336 char **canonicalname
)
1338 SockAddr ret
= snew(struct SockAddr_tag
);
1341 memset(ret
, 0, sizeof *ret
);
1342 ret
->family
= AF_UNIX
;
1344 * Mac OS X Leopard uses an innovative X display naming
1345 * convention in which the entire display name is the path to
1346 * the Unix socket, including the trailing :0 which only
1347 * _looks_ like a display number. Heuristically, I think
1348 * detecting this by means of a leading slash ought to be
1351 if (display
[0] == '/') {
1352 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1355 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1356 "%s%d", X11_UNIX_PATH
, displaynum
);
1359 ret
->error
= "snprintf failed";
1360 else if(n
>= sizeof ret
->hostname
)
1361 ret
->error
= "X11 UNIX name too long";
1363 *canonicalname
= dupstr(ret
->hostname
);
1365 ret
->ai
= ret
->ais
= NULL
;
1367 ret
->addresses
= NULL
;
1368 ret
->curraddr
= ret
->naddresses
= 0;