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
;
92 enum { UNRESOLVED
, UNIX
, IP
} superfamily
;
94 struct addrinfo
*ais
; /* Addresses IPv6 style. */
96 unsigned long *addresses
; /* Addresses IPv4 style. */
99 char hostname
[512]; /* Store an unresolved host name. */
103 * Which address family this address belongs to. AF_INET for IPv4;
104 * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
105 * not been done and a simple host name is held in this SockAddr
109 #define SOCKADDR_FAMILY(addr, step) \
110 ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
111 (addr)->superfamily == UNIX ? AF_UNIX : \
112 (step).ai ? (step).ai->ai_family : AF_INET)
114 #define SOCKADDR_FAMILY(addr, step) \
115 ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
116 (addr)->superfamily == UNIX ? AF_UNIX : AF_INET)
120 * Start a SockAddrStep structure to step through multiple
124 #define START_STEP(addr, step) \
125 ((step).ai = (addr)->ais, (step).curraddr = 0)
127 #define START_STEP(addr, step) \
128 ((step).curraddr = 0)
131 static tree234
*sktree
;
133 static void uxsel_tell(Actual_Socket s
);
135 static int cmpfortree(void *av
, void *bv
)
137 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
138 int as
= a
->s
, bs
= b
->s
;
150 static int cmpforsearch(void *av
, void *bv
)
152 Actual_Socket b
= (Actual_Socket
) bv
;
153 int as
= *(int *)av
, bs
= b
->s
;
163 sktree
= newtree234(cmpfortree
);
166 void sk_cleanup(void)
172 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
178 SockAddr
sk_namelookup(const char *host
, char **canonicalname
, int address_family
)
180 SockAddr ret
= snew(struct SockAddr_tag
);
182 struct addrinfo hints
;
186 struct hostent
*h
= NULL
;
191 /* Clear the structure and default to IPv4. */
192 memset(ret
, 0, sizeof(struct SockAddr_tag
));
193 ret
->superfamily
= UNRESOLVED
;
198 hints
.ai_flags
= AI_CANONNAME
;
199 hints
.ai_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
200 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
202 hints
.ai_socktype
= SOCK_STREAM
;
203 hints
.ai_protocol
= 0;
204 hints
.ai_addrlen
= 0;
205 hints
.ai_addr
= NULL
;
206 hints
.ai_canonname
= NULL
;
207 hints
.ai_next
= NULL
;
208 err
= getaddrinfo(host
, NULL
, &hints
, &ret
->ais
);
210 ret
->error
= gai_strerror(err
);
213 ret
->superfamily
= IP
;
215 if (ret
->ais
->ai_canonname
!= NULL
)
216 strncat(realhost
, ret
->ais
->ai_canonname
, sizeof(realhost
) - 1);
218 strncat(realhost
, host
, sizeof(realhost
) - 1);
220 if ((a
= inet_addr(host
)) == (unsigned long)(in_addr_t
)(-1)) {
222 * Otherwise use the IPv4-only gethostbyname... (NOTE:
223 * we don't use gethostbyname as a fallback!)
225 if (ret
->superfamily
== UNRESOLVED
) {
226 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
227 if ( (h
= gethostbyname(host
)) )
228 ret
->superfamily
= IP
;
230 if (ret
->superfamily
== UNRESOLVED
) {
231 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
232 h_errno
== NO_DATA
||
233 h_errno
== NO_ADDRESS ?
"Host does not exist" :
234 h_errno
== TRY_AGAIN ?
235 "Temporary name service failure" :
236 "gethostbyname: unknown error");
239 /* This way we are always sure the h->h_name is valid :) */
240 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
241 for (n
= 0; h
->h_addr_list
[n
]; n
++);
242 ret
->addresses
= snewn(n
, unsigned long);
244 for (n
= 0; n
< ret
->naddresses
; n
++) {
245 memcpy(&a
, h
->h_addr_list
[n
], sizeof(a
));
246 ret
->addresses
[n
] = ntohl(a
);
250 * This must be a numeric IPv4 address because it caused a
251 * success return from inet_addr.
253 ret
->superfamily
= IP
;
254 strncpy(realhost
, host
, sizeof(realhost
));
255 ret
->addresses
= snew(unsigned long);
257 ret
->addresses
[0] = ntohl(a
);
260 realhost
[lenof(realhost
)-1] = '\0';
261 *canonicalname
= snewn(1+strlen(realhost
), char);
262 strcpy(*canonicalname
, realhost
);
266 SockAddr
sk_nonamelookup(const char *host
)
268 SockAddr ret
= snew(struct SockAddr_tag
);
270 ret
->superfamily
= UNRESOLVED
;
271 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
272 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
276 ret
->addresses
= NULL
;
281 static int sk_nextaddr(SockAddr addr
, SockAddrStep
*step
)
284 if (step
->ai
&& step
->ai
->ai_next
) {
285 step
->ai
= step
->ai
->ai_next
;
290 if (step
->curraddr
+1 < addr
->naddresses
) {
299 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
302 if (addr
->superfamily
== UNRESOLVED
) {
303 strncpy(buf
, addr
->hostname
, buflen
);
304 buf
[buflen
-1] = '\0';
307 if (getnameinfo(addr
->ais
->ai_addr
, addr
->ais
->ai_addrlen
, buf
, buflen
,
308 NULL
, 0, NI_NUMERICHOST
) != 0) {
310 strncat(buf
, "<unknown>", buflen
- 1);
315 START_STEP(addr
, step
);
316 assert(SOCKADDR_FAMILY(addr
, step
) == AF_INET
);
317 a
.s_addr
= htonl(addr
->addresses
[0]);
318 strncpy(buf
, inet_ntoa(a
), buflen
);
319 buf
[buflen
-1] = '\0';
324 int sk_hostname_is_local(char *name
)
326 return !strcmp(name
, "localhost");
329 #define ipv4_is_loopback(addr) \
330 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
332 static int sockaddr_is_loopback(struct sockaddr
*sa
)
334 struct sockaddr_in
*sin
;
336 struct sockaddr_in6
*sin6
;
339 switch (sa
->sa_family
) {
341 sin
= (struct sockaddr_in
*)sa
;
342 return ipv4_is_loopback(sin
->sin_addr
);
345 sin6
= (struct sockaddr_in6
*)sa
;
346 return IN6_IS_ADDR_LOOPBACK(&sin6
->sin6_addr
);
355 int sk_address_is_local(SockAddr addr
)
358 if (addr
->superfamily
== UNRESOLVED
)
359 return 0; /* we don't know; assume not */
362 return sockaddr_is_loopback(addr
->ais
->ai_addr
);
366 START_STEP(addr
, step
);
367 assert(SOCKADDR_FAMILY(addr
, step
) == AF_INET
);
368 a
.s_addr
= htonl(addr
->addresses
[0]);
369 return ipv4_is_loopback(a
);
374 int sk_addrtype(SockAddr addr
)
378 START_STEP(addr
, step
);
379 family
= SOCKADDR_FAMILY(addr
, step
);
381 return (family
== AF_INET ? ADDRTYPE_IPV4
:
383 family
== AF_INET6 ? ADDRTYPE_IPV6
:
388 void sk_addrcopy(SockAddr addr
, char *buf
)
392 START_STEP(addr
, step
);
393 family
= SOCKADDR_FAMILY(addr
, step
);
396 if (family
== AF_INET
)
397 memcpy(buf
, &((struct sockaddr_in
*)step
.ai
->ai_addr
)->sin_addr
,
398 sizeof(struct in_addr
));
399 else if (family
== AF_INET6
)
400 memcpy(buf
, &((struct sockaddr_in6
*)step
.ai
->ai_addr
)->sin6_addr
,
401 sizeof(struct in6_addr
));
407 assert(family
== AF_INET
);
408 a
.s_addr
= htonl(addr
->addresses
[step
.curraddr
]);
409 memcpy(buf
, (char*) &a
.s_addr
, 4);
413 void sk_addr_free(SockAddr addr
)
417 if (addr
->ais
!= NULL
)
418 freeaddrinfo(addr
->ais
);
420 sfree(addr
->addresses
);
425 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
427 Actual_Socket s
= (Actual_Socket
) sock
;
434 static void sk_tcp_flush(Socket s
)
437 * We send data to the socket as soon as we can anyway,
438 * so we don't need to do anything here. :-)
442 static void sk_tcp_close(Socket s
);
443 static int sk_tcp_write(Socket s
, const char *data
, int len
);
444 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
445 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
446 static void *sk_tcp_get_private_ptr(Socket s
);
447 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
448 static const char *sk_tcp_socket_error(Socket s
);
450 static struct socket_function_table tcp_fn_table
= {
456 sk_tcp_set_private_ptr
,
457 sk_tcp_get_private_ptr
,
462 Socket
sk_register(OSSocket sockfd
, Plug plug
)
467 * Create Socket structure.
469 ret
= snew(struct Socket_tag
);
470 ret
->fn
= &tcp_fn_table
;
473 bufchain_init(&ret
->output_data
);
474 ret
->writable
= 1; /* to start with */
475 ret
->sending_oob
= 0;
477 ret
->frozen_readable
= 0;
478 ret
->localhost_only
= 0; /* unused, but best init anyway */
479 ret
->pending_error
= 0;
480 ret
->oobpending
= FALSE
;
482 ret
->parent
= ret
->child
= NULL
;
489 ret
->error
= strerror(errno
);
501 static int try_connect(Actual_Socket sock
)
505 struct sockaddr_in6 a6
;
507 struct sockaddr_in a
;
508 struct sockaddr_un au
;
509 const struct sockaddr
*sa
;
512 int fl
, salen
, family
;
515 * Remove the socket from the tree before we overwrite its
516 * internal socket id, because that forms part of the tree's
517 * sorting criterion. We'll add it back before exiting this
518 * function, whether we changed anything or not.
520 del234(sktree
, sock
);
525 plug_log(sock
->plug
, 0, sock
->addr
, sock
->port
, NULL
, 0);
530 family
= SOCKADDR_FAMILY(sock
->addr
, sock
->step
);
531 assert(family
!= AF_UNSPEC
);
532 s
= socket(family
, SOCK_STREAM
, 0);
542 if (sock
->oobinline
) {
544 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
549 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
552 if (sock
->keepalive
) {
554 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
558 * Bind to local address.
561 localport
= 1023; /* count from 1023 downwards */
563 localport
= 0; /* just use port 0 (ie kernel picks) */
565 /* BSD IP stacks need sockaddr_in zeroed before filling in */
566 memset(&a
,'\0',sizeof(struct sockaddr_in
));
568 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
571 /* We don't try to bind to a local address for UNIX domain sockets. (Why
572 * do we bother doing the bind when localport == 0 anyway?) */
573 if (family
!= AF_UNIX
) {
574 /* Loop round trying to bind */
579 if (family
== AF_INET6
) {
580 /* XXX use getaddrinfo to get a local address? */
581 a6
.sin6_family
= AF_INET6
;
582 a6
.sin6_addr
= in6addr_any
;
583 a6
.sin6_port
= htons(localport
);
584 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
588 assert(family
== AF_INET
);
589 a
.sin_family
= AF_INET
;
590 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
591 a
.sin_port
= htons(localport
);
592 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
599 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
604 break; /* we're only looping once */
607 break; /* we might have got to the end */
615 * Connect to remote address.
620 /* XXX would be better to have got getaddrinfo() to fill in the port. */
621 ((struct sockaddr_in
*)sock
->step
.ai
->ai_addr
)->sin_port
=
623 sa
= (const struct sockaddr
*)sock
->step
.ai
->ai_addr
;
624 salen
= sock
->step
.ai
->ai_addrlen
;
627 ((struct sockaddr_in
*)sock
->step
.ai
->ai_addr
)->sin_port
=
629 sa
= (const struct sockaddr
*)sock
->step
.ai
->ai_addr
;
630 salen
= sock
->step
.ai
->ai_addrlen
;
634 a
.sin_family
= AF_INET
;
635 a
.sin_addr
.s_addr
= htonl(sock
->addr
->addresses
[sock
->step
.curraddr
]);
636 a
.sin_port
= htons((short) sock
->port
);
637 sa
= (const struct sockaddr
*)&a
;
642 assert(sock
->port
== 0); /* to catch confused people */
643 assert(strlen(sock
->addr
->hostname
) < sizeof au
.sun_path
);
644 memset(&au
, 0, sizeof au
);
645 au
.sun_family
= AF_UNIX
;
646 strcpy(au
.sun_path
, sock
->addr
->hostname
);
647 sa
= (const struct sockaddr
*)&au
;
652 assert(0 && "unknown address family");
653 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
656 fl
= fcntl(s
, F_GETFL
);
658 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
660 if ((connect(s
, sa
, salen
)) < 0) {
661 if ( errno
!= EINPROGRESS
) {
667 * If we _don't_ get EWOULDBLOCK, the connect has completed
668 * and we should set the socket as connected and writable.
679 * No matter what happened, put the socket back in the tree.
681 add234(sktree
, sock
);
684 plug_log(sock
->plug
, 1, sock
->addr
, sock
->port
, strerror(err
), err
);
688 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
689 int nodelay
, int keepalive
, Plug plug
)
695 * Create Socket structure.
697 ret
= snew(struct Socket_tag
);
698 ret
->fn
= &tcp_fn_table
;
701 bufchain_init(&ret
->output_data
);
702 ret
->connected
= 0; /* to start with */
703 ret
->writable
= 0; /* to start with */
704 ret
->sending_oob
= 0;
706 ret
->frozen_readable
= 0;
707 ret
->localhost_only
= 0; /* unused, but best init anyway */
708 ret
->pending_error
= 0;
709 ret
->parent
= ret
->child
= NULL
;
710 ret
->oobpending
= FALSE
;
713 START_STEP(ret
->addr
, ret
->step
);
715 ret
->oobinline
= oobinline
;
716 ret
->nodelay
= nodelay
;
717 ret
->keepalive
= keepalive
;
718 ret
->privport
= privport
;
723 err
= try_connect(ret
);
724 } while (err
&& sk_nextaddr(ret
->addr
, &ret
->step
));
727 ret
->error
= strerror(err
);
732 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int orig_address_family
)
736 struct addrinfo hints
, *ai
;
738 struct sockaddr_in6 a6
;
740 struct sockaddr
*addr
;
742 struct sockaddr_in a
;
749 * Create Socket structure.
751 ret
= snew(struct Socket_tag
);
752 ret
->fn
= &tcp_fn_table
;
755 bufchain_init(&ret
->output_data
);
756 ret
->writable
= 0; /* to start with */
757 ret
->sending_oob
= 0;
759 ret
->frozen_readable
= 0;
760 ret
->localhost_only
= local_host_only
;
761 ret
->pending_error
= 0;
762 ret
->parent
= ret
->child
= NULL
;
763 ret
->oobpending
= FALSE
;
768 * Translate address_family from platform-independent constants
769 * into local reality.
771 address_family
= (orig_address_family
== ADDRTYPE_IPV4 ? AF_INET
:
773 orig_address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
778 /* Let's default to IPv6.
779 * If the stack doesn't support IPv6, we will fall back to IPv4. */
780 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
782 /* No other choice, default to IPv4 */
783 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
789 s
= socket(address_family
, SOCK_STREAM
, 0);
792 /* If the host doesn't support IPv6 try fallback to IPv4. */
793 if (s
< 0 && address_family
== AF_INET6
) {
794 address_family
= AF_INET
;
795 s
= socket(address_family
, SOCK_STREAM
, 0);
800 ret
->error
= strerror(errno
);
808 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
811 addr
= NULL
; addrlen
= -1; /* placate optimiser */
813 if (srcaddr
!= NULL
) {
815 hints
.ai_flags
= AI_NUMERICHOST
;
816 hints
.ai_family
= address_family
;
817 hints
.ai_socktype
= SOCK_STREAM
;
818 hints
.ai_protocol
= 0;
819 hints
.ai_addrlen
= 0;
820 hints
.ai_addr
= NULL
;
821 hints
.ai_canonname
= NULL
;
822 hints
.ai_next
= NULL
;
823 assert(port
>= 0 && port
<= 99999);
824 sprintf(portstr
, "%d", port
);
825 retcode
= getaddrinfo(srcaddr
, portstr
, &hints
, &ai
);
828 addrlen
= ai
->ai_addrlen
;
831 memset(&a
,'\0',sizeof(struct sockaddr_in
));
832 a
.sin_family
= AF_INET
;
833 a
.sin_port
= htons(port
);
834 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
835 if (a
.sin_addr
.s_addr
!= (in_addr_t
)(-1)) {
836 /* Override localhost_only with specified listen addr. */
837 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
839 addr
= (struct sockaddr
*)&a
;
847 if (address_family
== AF_INET6
) {
848 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
849 a6
.sin6_family
= AF_INET6
;
850 a6
.sin6_port
= htons(port
);
852 a6
.sin6_addr
= in6addr_loopback
;
854 a6
.sin6_addr
= in6addr_any
;
855 addr
= (struct sockaddr
*)&a6
;
856 addrlen
= sizeof(a6
);
860 memset(&a
,'\0',sizeof(struct sockaddr_in
));
861 a
.sin_family
= AF_INET
;
862 a
.sin_port
= htons(port
);
864 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
866 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
867 addr
= (struct sockaddr
*)&a
;
872 retcode
= bind(s
, addr
, addrlen
);
875 ret
->error
= strerror(errno
);
879 if (listen(s
, SOMAXCONN
) < 0) {
881 ret
->error
= strerror(errno
);
887 * If we were given ADDRTYPE_UNSPEC, we must also create an
888 * IPv4 listening socket and link it to this one.
890 if (address_family
== AF_INET6
&& orig_address_family
== ADDRTYPE_UNSPEC
) {
893 other
= (Actual_Socket
) sk_newlistener(srcaddr
, port
, plug
,
894 local_host_only
, ADDRTYPE_IPV4
);
901 /* If we couldn't create a listening socket on IPv4 as well
902 * as IPv6, we must return an error overall. */
905 return (Socket
) other
;
919 static void sk_tcp_close(Socket sock
)
921 Actual_Socket s
= (Actual_Socket
) sock
;
924 sk_tcp_close((Socket
)s
->child
);
930 sk_addr_free(s
->addr
);
934 void *sk_getxdmdata(void *sock
, int *lenp
)
936 Actual_Socket s
= (Actual_Socket
) sock
;
938 struct sockaddr_in addr
;
940 struct sockaddr_storage addr
;
941 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)&addr
;
943 struct sockaddr
*sa
= (struct sockaddr
*)&addr
;
944 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&addr
;
947 static unsigned int unix_addr
= 0xFFFFFFFF;
950 * We must check that this socket really _is_ an Actual_Socket.
952 if (s
->fn
!= &tcp_fn_table
)
953 return NULL
; /* failure */
955 addrlen
= sizeof(addr
);
956 if (getsockname(s
->s
, sa
, &addrlen
) < 0)
958 switch(sa
->sa_family
) {
961 buf
= snewn(*lenp
, char);
962 PUT_32BIT_MSB_FIRST(buf
, ntohl(sin
->sin_addr
.s_addr
));
963 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin
->sin_port
));
968 buf
= snewn(*lenp
, char);
969 if (IN6_IS_ADDR_V4MAPPED(&sin6
->sin6_addr
)) {
970 memcpy(buf
, sin6
->sin6_addr
.s6_addr
+ 12, 4);
971 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin6
->sin6_port
));
973 /* This is stupid, but it's what XLib does. */
979 buf
= snewn(*lenp
, char);
980 PUT_32BIT_MSB_FIRST(buf
, unix_addr
--);
981 PUT_16BIT_MSB_FIRST(buf
+4, getpid());
994 * The function which tries to send on a socket once it's deemed
997 void try_send(Actual_Socket s
)
999 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
1003 int len
, urgentflag
;
1005 if (s
->sending_oob
) {
1006 urgentflag
= MSG_OOB
;
1007 len
= s
->sending_oob
;
1011 bufchain_prefix(&s
->output_data
, &data
, &len
);
1013 nsent
= send(s
->s
, data
, len
, urgentflag
);
1014 noise_ultralight(nsent
);
1016 err
= (nsent
< 0 ? errno
: 0);
1017 if (err
== EWOULDBLOCK
) {
1019 * Perfectly normal: we've sent all we can for the moment.
1021 s
->writable
= FALSE
;
1025 * We unfortunately can't just call plug_closing(),
1026 * because it's quite likely that we're currently
1027 * _in_ a call from the code we'd be calling back
1028 * to, so we'd have to make half the SSH code
1029 * reentrant. Instead we flag a pending error on
1030 * the socket, to be dealt with (by calling
1031 * plug_closing()) at some suitable future moment.
1033 s
->pending_error
= err
;
1037 if (s
->sending_oob
) {
1039 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
1040 s
->sending_oob
= len
- nsent
;
1045 bufchain_consume(&s
->output_data
, nsent
);
1052 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
1054 Actual_Socket s
= (Actual_Socket
) sock
;
1057 * Add the data to the buffer list on the socket.
1059 bufchain_add(&s
->output_data
, buf
, len
);
1062 * Now try sending from the start of the buffer list.
1068 * Update the select() status to correctly reflect whether or
1069 * not we should be selecting for write.
1073 return bufchain_size(&s
->output_data
);
1076 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
1078 Actual_Socket s
= (Actual_Socket
) sock
;
1081 * Replace the buffer list on the socket with the data.
1083 bufchain_clear(&s
->output_data
);
1084 assert(len
<= sizeof(s
->oobdata
));
1085 memcpy(s
->oobdata
, buf
, len
);
1086 s
->sending_oob
= len
;
1089 * Now try sending from the start of the buffer list.
1095 * Update the select() status to correctly reflect whether or
1096 * not we should be selecting for write.
1100 return s
->sending_oob
;
1103 static int net_select_result(int fd
, int event
)
1106 char buf
[20480]; /* nice big buffer for plenty of speed */
1110 /* Find the Socket structure */
1111 s
= find234(sktree
, &fd
, cmpforsearch
);
1113 return 1; /* boggle */
1115 noise_ultralight(event
);
1118 case 4: /* exceptional */
1119 if (!s
->oobinline
) {
1121 * On a non-oobinline socket, this indicates that we
1122 * can immediately perform an OOB read and get back OOB
1123 * data, which we will send to the back end with
1124 * type==2 (urgent data).
1126 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1127 noise_ultralight(ret
);
1129 return plug_closing(s
->plug
,
1130 ret
== 0 ?
"Internal networking trouble" :
1131 strerror(errno
), errno
, 0);
1134 * Receiving actual data on a socket means we can
1135 * stop falling back through the candidate
1136 * addresses to connect to.
1139 sk_addr_free(s
->addr
);
1142 return plug_receive(s
->plug
, 2, buf
, ret
);
1148 * If we reach here, this is an oobinline socket, which
1149 * means we should set s->oobpending and then deal with it
1150 * when we get called for the readability event (which
1151 * should also occur).
1153 s
->oobpending
= TRUE
;
1155 case 1: /* readable; also acceptance */
1158 * On a listening socket, the readability event means a
1159 * connection is ready to be accepted.
1162 struct sockaddr_in ss
;
1164 struct sockaddr_storage ss
;
1166 socklen_t addrlen
= sizeof(ss
);
1167 int t
; /* socket of connection */
1170 memset(&ss
, 0, addrlen
);
1171 t
= accept(s
->s
, (struct sockaddr
*)&ss
, &addrlen
);
1176 fl
= fcntl(t
, F_GETFL
);
1178 fcntl(t
, F_SETFL
, fl
| O_NONBLOCK
);
1180 if (s
->localhost_only
&&
1181 !sockaddr_is_loopback((struct sockaddr
*)&ss
)) {
1182 close(t
); /* someone let nonlocal through?! */
1183 } else if (plug_accepting(s
->plug
, t
)) {
1184 close(t
); /* denied or error */
1190 * If we reach here, this is not a listening socket, so
1191 * readability really means readability.
1194 /* In the case the socket is still frozen, we don't even bother */
1196 s
->frozen_readable
= 1;
1201 * We have received data on the socket. For an oobinline
1202 * socket, this might be data _before_ an urgent pointer,
1203 * in which case we send it to the back end with type==1
1204 * (data prior to urgent).
1206 if (s
->oobinline
&& s
->oobpending
) {
1208 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
1209 s
->oobpending
= FALSE
; /* clear this indicator */
1213 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
1214 noise_ultralight(ret
);
1216 if (errno
== EWOULDBLOCK
) {
1222 * An error at this point _might_ be an error reported
1223 * by a non-blocking connect(). So before we return a
1224 * panic status to the user, let's just see whether
1229 plug_log(s
->plug
, 1, s
->addr
, s
->port
, strerror(err
), err
);
1230 while (s
->addr
&& sk_nextaddr(s
->addr
, &s
->step
)) {
1231 err
= try_connect(s
);
1235 return plug_closing(s
->plug
, strerror(err
), err
, 0);
1236 } else if (0 == ret
) {
1237 return plug_closing(s
->plug
, NULL
, 0, 0);
1240 * Receiving actual data on a socket means we can
1241 * stop falling back through the candidate
1242 * addresses to connect to.
1245 sk_addr_free(s
->addr
);
1248 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1251 case 2: /* writable */
1252 if (!s
->connected
) {
1254 * select() reports a socket as _writable_ when an
1255 * asynchronous connection is completed.
1257 s
->connected
= s
->writable
= 1;
1261 int bufsize_before
, bufsize_after
;
1263 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1265 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1266 if (bufsize_after
< bufsize_before
)
1267 plug_sent(s
->plug
, bufsize_after
);
1276 * Deal with socket errors detected in try_send().
1278 void net_pending_errors(void)
1284 * This might be a fiddly business, because it's just possible
1285 * that handling a pending error on one socket might cause
1286 * others to be closed. (I can't think of any reason this might
1287 * happen in current SSH implementation, but to maintain
1288 * generality of this network layer I'll assume the worst.)
1290 * So what we'll do is search the socket list for _one_ socket
1291 * with a pending error, and then handle it, and then search
1292 * the list again _from the beginning_. Repeat until we make a
1293 * pass with no socket errors present. That way we are
1294 * protected against the socket list changing under our feet.
1298 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1299 if (s
->pending_error
) {
1301 * An error has occurred on this socket. Pass it to the
1304 plug_closing(s
->plug
, strerror(s
->pending_error
),
1305 s
->pending_error
, 0);
1313 * Each socket abstraction contains a `void *' private field in
1314 * which the client can keep state.
1316 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1318 Actual_Socket s
= (Actual_Socket
) sock
;
1319 s
->private_ptr
= ptr
;
1322 static void *sk_tcp_get_private_ptr(Socket sock
)
1324 Actual_Socket s
= (Actual_Socket
) sock
;
1325 return s
->private_ptr
;
1329 * Special error values are returned from sk_namelookup and sk_new
1330 * if there's a problem. These functions extract an error message,
1331 * or return NULL if there's no problem.
1333 const char *sk_addr_error(SockAddr addr
)
1337 static const char *sk_tcp_socket_error(Socket sock
)
1339 Actual_Socket s
= (Actual_Socket
) sock
;
1343 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1345 Actual_Socket s
= (Actual_Socket
) sock
;
1346 if (s
->frozen
== is_frozen
)
1348 s
->frozen
= is_frozen
;
1349 if (!is_frozen
&& s
->frozen_readable
) {
1351 recv(s
->s
, &c
, 1, MSG_PEEK
);
1353 s
->frozen_readable
= 0;
1357 static void uxsel_tell(Actual_Socket s
)
1361 rwx
|= 1; /* read == accept */
1364 rwx
|= 2; /* write == connect */
1365 if (s
->connected
&& !s
->frozen
)
1366 rwx
|= 1 | 4; /* read, except */
1367 if (bufchain_size(&s
->output_data
))
1368 rwx
|= 2; /* write */
1370 uxsel_set(s
->s
, rwx
, net_select_result
);
1373 int net_service_lookup(char *service
)
1376 se
= getservbyname(service
, NULL
);
1378 return ntohs(se
->s_port
);
1383 SockAddr
platform_get_x11_unix_address(const char *display
, int displaynum
,
1384 char **canonicalname
)
1386 SockAddr ret
= snew(struct SockAddr_tag
);
1389 memset(ret
, 0, sizeof *ret
);
1390 ret
->superfamily
= UNIX
;
1392 * Mac OS X Leopard uses an innovative X display naming
1393 * convention in which the entire display name is the path to
1394 * the Unix socket, including the trailing :0 which only
1395 * _looks_ like a display number. Heuristically, I think
1396 * detecting this by means of a leading slash ought to be
1399 if (display
[0] == '/') {
1400 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1403 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1404 "%s%d", X11_UNIX_PATH
, displaynum
);
1407 ret
->error
= "snprintf failed";
1408 else if(n
>= sizeof ret
->hostname
)
1409 ret
->error
= "X11 UNIX name too long";
1411 *canonicalname
= dupstr(ret
->hostname
);
1415 ret
->addresses
= NULL
;
1416 ret
->naddresses
= 0;