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 * Mutable state that goes with a SockAddr: stores information
46 * about where in the list of candidate IP(v*) addresses we've
49 typedef struct SockAddrStep_tag SockAddrStep
;
50 struct SockAddrStep_tag
{
52 struct addrinfo
*ai
; /* steps along addr->ais */
58 struct socket_function_table
*fn
;
59 /* the above variable absolutely *must* be the first in this structure */
65 int connected
; /* irrelevant for listening sockets */
67 int frozen
; /* this causes readability notifications to be ignored */
68 int frozen_readable
; /* this means we missed at least one readability
69 * notification while we were frozen */
70 int localhost_only
; /* for listening sockets */
73 int oobpending
; /* is there OOB data available to read? */
75 int pending_error
; /* in case send() returns error */
77 int nodelay
, keepalive
; /* for connect()-type sockets */
78 int privport
, port
; /* and again */
82 * We sometimes need pairs of Socket structures to be linked:
83 * if we are listening on the same IPv6 and v4 port, for
84 * example. So here we define `parent' and `child' pointers to
87 Actual_Socket parent
, child
;
93 enum { UNRESOLVED
, UNIX
, IP
} superfamily
;
95 struct addrinfo
*ais
; /* Addresses IPv6 style. */
97 unsigned long *addresses
; /* Addresses IPv4 style. */
100 char hostname
[512]; /* Store an unresolved host name. */
104 * Which address family this address belongs to. AF_INET for IPv4;
105 * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
106 * not been done and a simple host name is held in this SockAddr
110 #define SOCKADDR_FAMILY(addr, step) \
111 ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
112 (addr)->superfamily == UNIX ? AF_UNIX : \
113 (step).ai ? (step).ai->ai_family : AF_INET)
115 #define SOCKADDR_FAMILY(addr, step) \
116 ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
117 (addr)->superfamily == UNIX ? AF_UNIX : AF_INET)
121 * Start a SockAddrStep structure to step through multiple
125 #define START_STEP(addr, step) \
126 ((step).ai = (addr)->ais, (step).curraddr = 0)
128 #define START_STEP(addr, step) \
129 ((step).curraddr = 0)
132 static tree234
*sktree
;
134 static void uxsel_tell(Actual_Socket s
);
136 static int cmpfortree(void *av
, void *bv
)
138 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
139 int as
= a
->s
, bs
= b
->s
;
151 static int cmpforsearch(void *av
, void *bv
)
153 Actual_Socket b
= (Actual_Socket
) bv
;
154 int as
= *(int *)av
, bs
= b
->s
;
164 sktree
= newtree234(cmpfortree
);
167 void sk_cleanup(void)
173 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
179 SockAddr
sk_namelookup(const char *host
, char **canonicalname
, int address_family
)
181 SockAddr ret
= snew(struct SockAddr_tag
);
183 struct addrinfo hints
;
187 struct hostent
*h
= NULL
;
192 /* Clear the structure and default to IPv4. */
193 memset(ret
, 0, sizeof(struct SockAddr_tag
));
194 ret
->superfamily
= UNRESOLVED
;
200 hints
.ai_flags
= AI_CANONNAME
;
201 hints
.ai_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
202 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
204 hints
.ai_socktype
= SOCK_STREAM
;
205 hints
.ai_protocol
= 0;
206 hints
.ai_addrlen
= 0;
207 hints
.ai_addr
= NULL
;
208 hints
.ai_canonname
= NULL
;
209 hints
.ai_next
= NULL
;
210 err
= getaddrinfo(host
, NULL
, &hints
, &ret
->ais
);
212 ret
->error
= gai_strerror(err
);
215 ret
->superfamily
= IP
;
217 if (ret
->ais
->ai_canonname
!= NULL
)
218 strncat(realhost
, ret
->ais
->ai_canonname
, sizeof(realhost
) - 1);
220 strncat(realhost
, host
, sizeof(realhost
) - 1);
222 if ((a
= inet_addr(host
)) == (unsigned long)(in_addr_t
)(-1)) {
224 * Otherwise use the IPv4-only gethostbyname... (NOTE:
225 * we don't use gethostbyname as a fallback!)
227 if (ret
->superfamily
== UNRESOLVED
) {
228 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
229 if ( (h
= gethostbyname(host
)) )
230 ret
->superfamily
= IP
;
232 if (ret
->superfamily
== UNRESOLVED
) {
233 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
234 h_errno
== NO_DATA
||
235 h_errno
== NO_ADDRESS ?
"Host does not exist" :
236 h_errno
== TRY_AGAIN ?
237 "Temporary name service failure" :
238 "gethostbyname: unknown error");
241 /* This way we are always sure the h->h_name is valid :) */
242 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
243 for (n
= 0; h
->h_addr_list
[n
]; n
++);
244 ret
->addresses
= snewn(n
, unsigned long);
246 for (n
= 0; n
< ret
->naddresses
; n
++) {
247 memcpy(&a
, h
->h_addr_list
[n
], sizeof(a
));
248 ret
->addresses
[n
] = ntohl(a
);
252 * This must be a numeric IPv4 address because it caused a
253 * success return from inet_addr.
255 ret
->superfamily
= IP
;
256 strncpy(realhost
, host
, sizeof(realhost
));
257 ret
->addresses
= snew(unsigned long);
259 ret
->addresses
[0] = ntohl(a
);
262 realhost
[lenof(realhost
)-1] = '\0';
263 *canonicalname
= snewn(1+strlen(realhost
), char);
264 strcpy(*canonicalname
, realhost
);
268 SockAddr
sk_nonamelookup(const char *host
)
270 SockAddr ret
= snew(struct SockAddr_tag
);
272 ret
->superfamily
= UNRESOLVED
;
273 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
274 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
278 ret
->addresses
= NULL
;
284 static int sk_nextaddr(SockAddr addr
, SockAddrStep
*step
)
287 if (step
->ai
&& step
->ai
->ai_next
) {
288 step
->ai
= step
->ai
->ai_next
;
293 if (step
->curraddr
+1 < addr
->naddresses
) {
302 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
304 /* XXX not clear what we should return for Unix-domain sockets; let's
305 * hope the question never arises */
306 assert(addr
->superfamily
!= UNIX
);
307 if (addr
->superfamily
== UNRESOLVED
) {
308 strncpy(buf
, addr
->hostname
, buflen
);
309 buf
[buflen
-1] = '\0';
312 if (getnameinfo(addr
->ais
->ai_addr
, addr
->ais
->ai_addrlen
, buf
, buflen
,
313 NULL
, 0, NI_NUMERICHOST
) != 0) {
315 strncat(buf
, "<unknown>", buflen
- 1);
320 START_STEP(addr
, step
);
321 assert(SOCKADDR_FAMILY(addr
, step
) == AF_INET
);
322 a
.s_addr
= htonl(addr
->addresses
[0]);
323 strncpy(buf
, inet_ntoa(a
), buflen
);
324 buf
[buflen
-1] = '\0';
329 int sk_hostname_is_local(char *name
)
331 return !strcmp(name
, "localhost") ||
332 !strcmp(name
, "::1") ||
333 !strncmp(name
, "127.", 4);
336 #define ipv4_is_loopback(addr) \
337 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
339 static int sockaddr_is_loopback(struct sockaddr
*sa
)
341 struct sockaddr_in
*sin
;
343 struct sockaddr_in6
*sin6
;
346 switch (sa
->sa_family
) {
348 sin
= (struct sockaddr_in
*)sa
;
349 return ipv4_is_loopback(sin
->sin_addr
);
352 sin6
= (struct sockaddr_in6
*)sa
;
353 return IN6_IS_ADDR_LOOPBACK(&sin6
->sin6_addr
);
362 int sk_address_is_local(SockAddr addr
)
364 if (addr
->superfamily
== UNRESOLVED
)
365 return 0; /* we don't know; assume not */
366 else if (addr
->superfamily
== UNIX
)
370 return sockaddr_is_loopback(addr
->ais
->ai_addr
);
374 START_STEP(addr
, step
);
375 assert(SOCKADDR_FAMILY(addr
, step
) == AF_INET
);
376 a
.s_addr
= htonl(addr
->addresses
[0]);
377 return ipv4_is_loopback(a
);
382 int sk_addrtype(SockAddr addr
)
386 START_STEP(addr
, step
);
387 family
= SOCKADDR_FAMILY(addr
, step
);
389 return (family
== AF_INET ? ADDRTYPE_IPV4
:
391 family
== AF_INET6 ? ADDRTYPE_IPV6
:
396 void sk_addrcopy(SockAddr addr
, char *buf
)
400 START_STEP(addr
, step
);
401 family
= SOCKADDR_FAMILY(addr
, step
);
404 if (family
== AF_INET
)
405 memcpy(buf
, &((struct sockaddr_in
*)step
.ai
->ai_addr
)->sin_addr
,
406 sizeof(struct in_addr
));
407 else if (family
== AF_INET6
)
408 memcpy(buf
, &((struct sockaddr_in6
*)step
.ai
->ai_addr
)->sin6_addr
,
409 sizeof(struct in6_addr
));
415 assert(family
== AF_INET
);
416 a
.s_addr
= htonl(addr
->addresses
[step
.curraddr
]);
417 memcpy(buf
, (char*) &a
.s_addr
, 4);
421 void sk_addr_free(SockAddr addr
)
423 if (--addr
->refcount
> 0)
426 if (addr
->ais
!= NULL
)
427 freeaddrinfo(addr
->ais
);
429 sfree(addr
->addresses
);
434 SockAddr
sk_addr_dup(SockAddr addr
)
440 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
442 Actual_Socket s
= (Actual_Socket
) sock
;
449 static void sk_tcp_flush(Socket s
)
452 * We send data to the socket as soon as we can anyway,
453 * so we don't need to do anything here. :-)
457 static void sk_tcp_close(Socket s
);
458 static int sk_tcp_write(Socket s
, const char *data
, int len
);
459 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
460 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
461 static void *sk_tcp_get_private_ptr(Socket s
);
462 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
463 static const char *sk_tcp_socket_error(Socket s
);
465 static struct socket_function_table tcp_fn_table
= {
471 sk_tcp_set_private_ptr
,
472 sk_tcp_get_private_ptr
,
477 Socket
sk_register(OSSocket sockfd
, Plug plug
)
482 * Create Socket structure.
484 ret
= snew(struct Socket_tag
);
485 ret
->fn
= &tcp_fn_table
;
488 bufchain_init(&ret
->output_data
);
489 ret
->writable
= 1; /* to start with */
490 ret
->sending_oob
= 0;
492 ret
->frozen_readable
= 0;
493 ret
->localhost_only
= 0; /* unused, but best init anyway */
494 ret
->pending_error
= 0;
495 ret
->oobpending
= FALSE
;
497 ret
->parent
= ret
->child
= NULL
;
504 ret
->error
= strerror(errno
);
516 static int try_connect(Actual_Socket sock
)
520 struct sockaddr_in6 a6
;
522 struct sockaddr_in a
;
523 struct sockaddr_un au
;
524 const struct sockaddr
*sa
;
527 int fl
, salen
, family
;
530 * Remove the socket from the tree before we overwrite its
531 * internal socket id, because that forms part of the tree's
532 * sorting criterion. We'll add it back before exiting this
533 * function, whether we changed anything or not.
535 del234(sktree
, sock
);
540 plug_log(sock
->plug
, 0, sock
->addr
, sock
->port
, NULL
, 0);
545 family
= SOCKADDR_FAMILY(sock
->addr
, sock
->step
);
546 assert(family
!= AF_UNSPEC
);
547 s
= socket(family
, SOCK_STREAM
, 0);
557 if (sock
->oobinline
) {
559 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
564 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
567 if (sock
->keepalive
) {
569 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
573 * Bind to local address.
576 localport
= 1023; /* count from 1023 downwards */
578 localport
= 0; /* just use port 0 (ie kernel picks) */
580 /* BSD IP stacks need sockaddr_in zeroed before filling in */
581 memset(&a
,'\0',sizeof(struct sockaddr_in
));
583 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
586 /* We don't try to bind to a local address for UNIX domain sockets. (Why
587 * do we bother doing the bind when localport == 0 anyway?) */
588 if (family
!= AF_UNIX
) {
589 /* Loop round trying to bind */
594 if (family
== AF_INET6
) {
595 /* XXX use getaddrinfo to get a local address? */
596 a6
.sin6_family
= AF_INET6
;
597 a6
.sin6_addr
= in6addr_any
;
598 a6
.sin6_port
= htons(localport
);
599 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
603 assert(family
== AF_INET
);
604 a
.sin_family
= AF_INET
;
605 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
606 a
.sin_port
= htons(localport
);
607 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
614 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
619 break; /* we're only looping once */
622 break; /* we might have got to the end */
630 * Connect to remote address.
635 /* XXX would be better to have got getaddrinfo() to fill in the port. */
636 ((struct sockaddr_in
*)sock
->step
.ai
->ai_addr
)->sin_port
=
638 sa
= (const struct sockaddr
*)sock
->step
.ai
->ai_addr
;
639 salen
= sock
->step
.ai
->ai_addrlen
;
642 ((struct sockaddr_in
*)sock
->step
.ai
->ai_addr
)->sin_port
=
644 sa
= (const struct sockaddr
*)sock
->step
.ai
->ai_addr
;
645 salen
= sock
->step
.ai
->ai_addrlen
;
649 a
.sin_family
= AF_INET
;
650 a
.sin_addr
.s_addr
= htonl(sock
->addr
->addresses
[sock
->step
.curraddr
]);
651 a
.sin_port
= htons((short) sock
->port
);
652 sa
= (const struct sockaddr
*)&a
;
657 assert(sock
->port
== 0); /* to catch confused people */
658 assert(strlen(sock
->addr
->hostname
) < sizeof au
.sun_path
);
659 memset(&au
, 0, sizeof au
);
660 au
.sun_family
= AF_UNIX
;
661 strcpy(au
.sun_path
, sock
->addr
->hostname
);
662 sa
= (const struct sockaddr
*)&au
;
667 assert(0 && "unknown address family");
668 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
671 fl
= fcntl(s
, F_GETFL
);
673 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
675 if ((connect(s
, sa
, salen
)) < 0) {
676 if ( errno
!= EINPROGRESS
) {
682 * If we _don't_ get EWOULDBLOCK, the connect has completed
683 * and we should set the socket as connected and writable.
694 * No matter what happened, put the socket back in the tree.
696 add234(sktree
, sock
);
699 plug_log(sock
->plug
, 1, sock
->addr
, sock
->port
, strerror(err
), err
);
703 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
704 int nodelay
, int keepalive
, Plug plug
)
710 * Create Socket structure.
712 ret
= snew(struct Socket_tag
);
713 ret
->fn
= &tcp_fn_table
;
716 bufchain_init(&ret
->output_data
);
717 ret
->connected
= 0; /* to start with */
718 ret
->writable
= 0; /* to start with */
719 ret
->sending_oob
= 0;
721 ret
->frozen_readable
= 0;
722 ret
->localhost_only
= 0; /* unused, but best init anyway */
723 ret
->pending_error
= 0;
724 ret
->parent
= ret
->child
= NULL
;
725 ret
->oobpending
= FALSE
;
728 START_STEP(ret
->addr
, ret
->step
);
730 ret
->oobinline
= oobinline
;
731 ret
->nodelay
= nodelay
;
732 ret
->keepalive
= keepalive
;
733 ret
->privport
= privport
;
738 err
= try_connect(ret
);
739 } while (err
&& sk_nextaddr(ret
->addr
, &ret
->step
));
742 ret
->error
= strerror(err
);
747 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int orig_address_family
)
751 struct addrinfo hints
, *ai
;
753 struct sockaddr_in6 a6
;
755 struct sockaddr
*addr
;
757 struct sockaddr_in a
;
764 * Create Socket structure.
766 ret
= snew(struct Socket_tag
);
767 ret
->fn
= &tcp_fn_table
;
770 bufchain_init(&ret
->output_data
);
771 ret
->writable
= 0; /* to start with */
772 ret
->sending_oob
= 0;
774 ret
->frozen_readable
= 0;
775 ret
->localhost_only
= local_host_only
;
776 ret
->pending_error
= 0;
777 ret
->parent
= ret
->child
= NULL
;
778 ret
->oobpending
= FALSE
;
783 * Translate address_family from platform-independent constants
784 * into local reality.
786 address_family
= (orig_address_family
== ADDRTYPE_IPV4 ? AF_INET
:
788 orig_address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
793 /* Let's default to IPv6.
794 * If the stack doesn't support IPv6, we will fall back to IPv4. */
795 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
797 /* No other choice, default to IPv4 */
798 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
804 s
= socket(address_family
, SOCK_STREAM
, 0);
807 /* If the host doesn't support IPv6 try fallback to IPv4. */
808 if (s
< 0 && address_family
== AF_INET6
) {
809 address_family
= AF_INET
;
810 s
= socket(address_family
, SOCK_STREAM
, 0);
815 ret
->error
= strerror(errno
);
823 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
826 addr
= NULL
; addrlen
= -1; /* placate optimiser */
828 if (srcaddr
!= NULL
) {
830 hints
.ai_flags
= AI_NUMERICHOST
;
831 hints
.ai_family
= address_family
;
832 hints
.ai_socktype
= SOCK_STREAM
;
833 hints
.ai_protocol
= 0;
834 hints
.ai_addrlen
= 0;
835 hints
.ai_addr
= NULL
;
836 hints
.ai_canonname
= NULL
;
837 hints
.ai_next
= NULL
;
838 assert(port
>= 0 && port
<= 99999);
839 sprintf(portstr
, "%d", port
);
840 retcode
= getaddrinfo(srcaddr
, portstr
, &hints
, &ai
);
843 addrlen
= ai
->ai_addrlen
;
846 memset(&a
,'\0',sizeof(struct sockaddr_in
));
847 a
.sin_family
= AF_INET
;
848 a
.sin_port
= htons(port
);
849 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
850 if (a
.sin_addr
.s_addr
!= (in_addr_t
)(-1)) {
851 /* Override localhost_only with specified listen addr. */
852 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
854 addr
= (struct sockaddr
*)&a
;
862 if (address_family
== AF_INET6
) {
863 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
864 a6
.sin6_family
= AF_INET6
;
865 a6
.sin6_port
= htons(port
);
867 a6
.sin6_addr
= in6addr_loopback
;
869 a6
.sin6_addr
= in6addr_any
;
870 addr
= (struct sockaddr
*)&a6
;
871 addrlen
= sizeof(a6
);
875 memset(&a
,'\0',sizeof(struct sockaddr_in
));
876 a
.sin_family
= AF_INET
;
877 a
.sin_port
= htons(port
);
879 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
881 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
882 addr
= (struct sockaddr
*)&a
;
887 retcode
= bind(s
, addr
, addrlen
);
890 ret
->error
= strerror(errno
);
894 if (listen(s
, SOMAXCONN
) < 0) {
896 ret
->error
= strerror(errno
);
902 * If we were given ADDRTYPE_UNSPEC, we must also create an
903 * IPv4 listening socket and link it to this one.
905 if (address_family
== AF_INET6
&& orig_address_family
== ADDRTYPE_UNSPEC
) {
908 other
= (Actual_Socket
) sk_newlistener(srcaddr
, port
, plug
,
909 local_host_only
, ADDRTYPE_IPV4
);
916 /* If we couldn't create a listening socket on IPv4 as well
917 * as IPv6, we must return an error overall. */
920 return (Socket
) other
;
934 static void sk_tcp_close(Socket sock
)
936 Actual_Socket s
= (Actual_Socket
) sock
;
939 sk_tcp_close((Socket
)s
->child
);
945 sk_addr_free(s
->addr
);
949 void *sk_getxdmdata(void *sock
, int *lenp
)
951 Actual_Socket s
= (Actual_Socket
) sock
;
953 struct sockaddr_in addr
;
955 struct sockaddr_storage addr
;
956 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)&addr
;
958 struct sockaddr
*sa
= (struct sockaddr
*)&addr
;
959 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&addr
;
962 static unsigned int unix_addr
= 0xFFFFFFFF;
965 * We must check that this socket really _is_ an Actual_Socket.
967 if (s
->fn
!= &tcp_fn_table
)
968 return NULL
; /* failure */
970 addrlen
= sizeof(addr
);
971 if (getsockname(s
->s
, sa
, &addrlen
) < 0)
973 switch(sa
->sa_family
) {
976 buf
= snewn(*lenp
, char);
977 PUT_32BIT_MSB_FIRST(buf
, ntohl(sin
->sin_addr
.s_addr
));
978 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin
->sin_port
));
983 buf
= snewn(*lenp
, char);
984 if (IN6_IS_ADDR_V4MAPPED(&sin6
->sin6_addr
)) {
985 memcpy(buf
, sin6
->sin6_addr
.s6_addr
+ 12, 4);
986 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin6
->sin6_port
));
988 /* This is stupid, but it's what XLib does. */
994 buf
= snewn(*lenp
, char);
995 PUT_32BIT_MSB_FIRST(buf
, unix_addr
--);
996 PUT_16BIT_MSB_FIRST(buf
+4, getpid());
1009 * The function which tries to send on a socket once it's deemed
1012 void try_send(Actual_Socket s
)
1014 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
1018 int len
, urgentflag
;
1020 if (s
->sending_oob
) {
1021 urgentflag
= MSG_OOB
;
1022 len
= s
->sending_oob
;
1026 bufchain_prefix(&s
->output_data
, &data
, &len
);
1028 nsent
= send(s
->s
, data
, len
, urgentflag
);
1029 noise_ultralight(nsent
);
1031 err
= (nsent
< 0 ? errno
: 0);
1032 if (err
== EWOULDBLOCK
) {
1034 * Perfectly normal: we've sent all we can for the moment.
1036 s
->writable
= FALSE
;
1040 * We unfortunately can't just call plug_closing(),
1041 * because it's quite likely that we're currently
1042 * _in_ a call from the code we'd be calling back
1043 * to, so we'd have to make half the SSH code
1044 * reentrant. Instead we flag a pending error on
1045 * the socket, to be dealt with (by calling
1046 * plug_closing()) at some suitable future moment.
1048 s
->pending_error
= err
;
1052 if (s
->sending_oob
) {
1054 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
1055 s
->sending_oob
= len
- nsent
;
1060 bufchain_consume(&s
->output_data
, nsent
);
1067 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
1069 Actual_Socket s
= (Actual_Socket
) sock
;
1072 * Add the data to the buffer list on the socket.
1074 bufchain_add(&s
->output_data
, buf
, len
);
1077 * Now try sending from the start of the buffer list.
1083 * Update the select() status to correctly reflect whether or
1084 * not we should be selecting for write.
1088 return bufchain_size(&s
->output_data
);
1091 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
1093 Actual_Socket s
= (Actual_Socket
) sock
;
1096 * Replace the buffer list on the socket with the data.
1098 bufchain_clear(&s
->output_data
);
1099 assert(len
<= sizeof(s
->oobdata
));
1100 memcpy(s
->oobdata
, buf
, len
);
1101 s
->sending_oob
= len
;
1104 * Now try sending from the start of the buffer list.
1110 * Update the select() status to correctly reflect whether or
1111 * not we should be selecting for write.
1115 return s
->sending_oob
;
1118 static int net_select_result(int fd
, int event
)
1121 char buf
[20480]; /* nice big buffer for plenty of speed */
1125 /* Find the Socket structure */
1126 s
= find234(sktree
, &fd
, cmpforsearch
);
1128 return 1; /* boggle */
1130 noise_ultralight(event
);
1133 case 4: /* exceptional */
1134 if (!s
->oobinline
) {
1136 * On a non-oobinline socket, this indicates that we
1137 * can immediately perform an OOB read and get back OOB
1138 * data, which we will send to the back end with
1139 * type==2 (urgent data).
1141 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1142 noise_ultralight(ret
);
1144 return plug_closing(s
->plug
,
1145 ret
== 0 ?
"Internal networking trouble" :
1146 strerror(errno
), errno
, 0);
1149 * Receiving actual data on a socket means we can
1150 * stop falling back through the candidate
1151 * addresses to connect to.
1154 sk_addr_free(s
->addr
);
1157 return plug_receive(s
->plug
, 2, buf
, ret
);
1163 * If we reach here, this is an oobinline socket, which
1164 * means we should set s->oobpending and then deal with it
1165 * when we get called for the readability event (which
1166 * should also occur).
1168 s
->oobpending
= TRUE
;
1170 case 1: /* readable; also acceptance */
1173 * On a listening socket, the readability event means a
1174 * connection is ready to be accepted.
1177 struct sockaddr_in ss
;
1179 struct sockaddr_storage ss
;
1181 socklen_t addrlen
= sizeof(ss
);
1182 int t
; /* socket of connection */
1185 memset(&ss
, 0, addrlen
);
1186 t
= accept(s
->s
, (struct sockaddr
*)&ss
, &addrlen
);
1191 fl
= fcntl(t
, F_GETFL
);
1193 fcntl(t
, F_SETFL
, fl
| O_NONBLOCK
);
1195 if (s
->localhost_only
&&
1196 !sockaddr_is_loopback((struct sockaddr
*)&ss
)) {
1197 close(t
); /* someone let nonlocal through?! */
1198 } else if (plug_accepting(s
->plug
, t
)) {
1199 close(t
); /* denied or error */
1205 * If we reach here, this is not a listening socket, so
1206 * readability really means readability.
1209 /* In the case the socket is still frozen, we don't even bother */
1211 s
->frozen_readable
= 1;
1216 * We have received data on the socket. For an oobinline
1217 * socket, this might be data _before_ an urgent pointer,
1218 * in which case we send it to the back end with type==1
1219 * (data prior to urgent).
1221 if (s
->oobinline
&& s
->oobpending
) {
1223 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
1224 s
->oobpending
= FALSE
; /* clear this indicator */
1228 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
1229 noise_ultralight(ret
);
1231 if (errno
== EWOULDBLOCK
) {
1237 * An error at this point _might_ be an error reported
1238 * by a non-blocking connect(). So before we return a
1239 * panic status to the user, let's just see whether
1244 plug_log(s
->plug
, 1, s
->addr
, s
->port
, strerror(err
), err
);
1245 while (s
->addr
&& sk_nextaddr(s
->addr
, &s
->step
)) {
1246 err
= try_connect(s
);
1250 return plug_closing(s
->plug
, strerror(err
), err
, 0);
1251 } else if (0 == ret
) {
1252 return plug_closing(s
->plug
, NULL
, 0, 0);
1255 * Receiving actual data on a socket means we can
1256 * stop falling back through the candidate
1257 * addresses to connect to.
1260 sk_addr_free(s
->addr
);
1263 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1266 case 2: /* writable */
1267 if (!s
->connected
) {
1269 * select() reports a socket as _writable_ when an
1270 * asynchronous connection is completed.
1272 s
->connected
= s
->writable
= 1;
1276 int bufsize_before
, bufsize_after
;
1278 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1280 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1281 if (bufsize_after
< bufsize_before
)
1282 plug_sent(s
->plug
, bufsize_after
);
1291 * Deal with socket errors detected in try_send().
1293 void net_pending_errors(void)
1299 * This might be a fiddly business, because it's just possible
1300 * that handling a pending error on one socket might cause
1301 * others to be closed. (I can't think of any reason this might
1302 * happen in current SSH implementation, but to maintain
1303 * generality of this network layer I'll assume the worst.)
1305 * So what we'll do is search the socket list for _one_ socket
1306 * with a pending error, and then handle it, and then search
1307 * the list again _from the beginning_. Repeat until we make a
1308 * pass with no socket errors present. That way we are
1309 * protected against the socket list changing under our feet.
1313 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1314 if (s
->pending_error
) {
1316 * An error has occurred on this socket. Pass it to the
1319 plug_closing(s
->plug
, strerror(s
->pending_error
),
1320 s
->pending_error
, 0);
1328 * Each socket abstraction contains a `void *' private field in
1329 * which the client can keep state.
1331 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1333 Actual_Socket s
= (Actual_Socket
) sock
;
1334 s
->private_ptr
= ptr
;
1337 static void *sk_tcp_get_private_ptr(Socket sock
)
1339 Actual_Socket s
= (Actual_Socket
) sock
;
1340 return s
->private_ptr
;
1344 * Special error values are returned from sk_namelookup and sk_new
1345 * if there's a problem. These functions extract an error message,
1346 * or return NULL if there's no problem.
1348 const char *sk_addr_error(SockAddr addr
)
1352 static const char *sk_tcp_socket_error(Socket sock
)
1354 Actual_Socket s
= (Actual_Socket
) sock
;
1358 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1360 Actual_Socket s
= (Actual_Socket
) sock
;
1361 if (s
->frozen
== is_frozen
)
1363 s
->frozen
= is_frozen
;
1364 if (!is_frozen
&& s
->frozen_readable
) {
1366 recv(s
->s
, &c
, 1, MSG_PEEK
);
1368 s
->frozen_readable
= 0;
1372 static void uxsel_tell(Actual_Socket s
)
1376 rwx
|= 1; /* read == accept */
1379 rwx
|= 2; /* write == connect */
1380 if (s
->connected
&& !s
->frozen
)
1381 rwx
|= 1 | 4; /* read, except */
1382 if (bufchain_size(&s
->output_data
))
1383 rwx
|= 2; /* write */
1385 uxsel_set(s
->s
, rwx
, net_select_result
);
1388 int net_service_lookup(char *service
)
1391 se
= getservbyname(service
, NULL
);
1393 return ntohs(se
->s_port
);
1398 char *get_hostname(void)
1401 char *hostname
= NULL
;
1404 hostname
= sresize(hostname
, len
, char);
1405 if ((gethostname(hostname
, len
) < 0) &&
1406 (errno
!= ENAMETOOLONG
)) {
1411 } while (strlen(hostname
) >= len
-1);
1415 SockAddr
platform_get_x11_unix_address(const char *sockpath
, int displaynum
)
1417 SockAddr ret
= snew(struct SockAddr_tag
);
1420 memset(ret
, 0, sizeof *ret
);
1421 ret
->superfamily
= UNIX
;
1423 * In special circumstances (notably Mac OS X Leopard), we'll
1424 * have been passed an explicit Unix socket path.
1427 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1430 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1431 "%s%d", X11_UNIX_PATH
, displaynum
);
1435 ret
->error
= "snprintf failed";
1436 else if (n
>= sizeof ret
->hostname
)
1437 ret
->error
= "X11 UNIX name too long";
1442 ret
->addresses
= NULL
;
1443 ret
->naddresses
= 0;