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
26 # define X11_UNIX_PATH "/tmp/.X11-unix/X"
29 #define ipv4_is_loopback(addr) (inet_netof(addr) == IN_LOOPBACKNET)
32 struct socket_function_table
*fn
;
33 /* the above variable absolutely *must* be the first in this structure */
41 int frozen
; /* this causes readability notifications to be ignored */
42 int frozen_readable
; /* this means we missed at least one readability
43 * notification while we were frozen */
44 int localhost_only
; /* for listening sockets */
47 int oobpending
; /* is there OOB data available to read? */
49 int pending_error
; /* in case send() returns error */
54 * We used to typedef struct Socket_tag *Socket.
56 * Since we have made the networking abstraction slightly more
57 * abstract, Socket no longer means a tcp socket (it could mean
58 * an ssl socket). So now we must use Actual_Socket when we know
59 * we are talking about a tcp socket.
61 typedef struct Socket_tag
*Actual_Socket
;
66 * Which address family this address belongs to. AF_INET for
67 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
68 * resolution has not been done and a simple host name is held
69 * in this SockAddr structure.
73 struct addrinfo
*ai
; /* Address IPv6 style. */
75 unsigned long address
; /* Address IPv4 style. */
77 char hostname
[512]; /* Store an unresolved host name. */
80 static tree234
*sktree
;
82 static void uxsel_tell(Actual_Socket s
);
84 static int cmpfortree(void *av
, void *bv
)
86 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
87 int as
= a
->s
, bs
= b
->s
;
95 static int cmpforsearch(void *av
, void *bv
)
97 Actual_Socket b
= (Actual_Socket
) bv
;
98 int as
= *(int *)av
, bs
= b
->s
;
108 sktree
= newtree234(cmpfortree
);
111 void sk_cleanup(void)
117 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
123 const char *error_string(int error
)
125 return strerror(error
);
128 SockAddr
sk_namelookup(const char *host
, char **canonicalname
, int address_family
)
130 SockAddr ret
= snew(struct SockAddr_tag
);
132 struct addrinfo hints
;
136 struct hostent
*h
= NULL
;
140 /* Clear the structure and default to IPv4. */
141 memset(ret
, 0, sizeof(struct SockAddr_tag
));
142 ret
->family
= 0; /* We set this one when we have resolved the host. */
147 hints
.ai_flags
= AI_CANONNAME
;
148 hints
.ai_family
= address_family
;
149 hints
.ai_socktype
= 0;
150 hints
.ai_protocol
= 0;
151 hints
.ai_addrlen
= 0;
152 hints
.ai_addr
= NULL
;
153 hints
.ai_canonname
= NULL
;
154 hints
.ai_next
= NULL
;
155 err
= getaddrinfo(host
, NULL
, &hints
, &ret
->ai
);
157 ret
->error
= gai_strerror(err
);
160 ret
->family
= ret
->ai
->ai_family
;
162 if (ret
->ai
->ai_canonname
!= NULL
)
163 strncat(realhost
, ret
->ai
->ai_canonname
, sizeof(realhost
) - 1);
165 strncat(realhost
, host
, sizeof(realhost
) - 1);
167 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
169 * Otherwise use the IPv4-only gethostbyname... (NOTE:
170 * we don't use gethostbyname as a fallback!)
172 if (ret
->family
== 0) {
173 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
174 if ( (h
= gethostbyname(host
)) )
175 ret
->family
= AF_INET
;
177 if (ret
->family
== 0) {
178 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
179 h_errno
== NO_DATA
||
180 h_errno
== NO_ADDRESS ?
"Host does not exist" :
181 h_errno
== TRY_AGAIN ?
182 "Temporary name service failure" :
183 "gethostbyname: unknown error");
186 memcpy(&a
, h
->h_addr
, sizeof(a
));
187 /* This way we are always sure the h->h_name is valid :) */
188 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
191 * This must be a numeric IPv4 address because it caused a
192 * success return from inet_addr.
194 ret
->family
= AF_INET
;
195 strncpy(realhost
, host
, sizeof(realhost
));
197 ret
->address
= ntohl(a
);
199 realhost
[lenof(realhost
)-1] = '\0';
200 *canonicalname
= snewn(1+strlen(realhost
), char);
201 strcpy(*canonicalname
, realhost
);
205 SockAddr
sk_nonamelookup(const char *host
)
207 SockAddr ret
= snew(struct SockAddr_tag
);
209 ret
->family
= AF_UNSPEC
;
210 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
211 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
218 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
221 if (addr
->family
== AF_UNSPEC
) {
222 strncpy(buf
, addr
->hostname
, buflen
);
223 buf
[buflen
-1] = '\0';
226 if (getnameinfo(addr
->ai
->ai_addr
, addr
->ai
->ai_addrlen
, buf
, buflen
,
227 NULL
, 0, NI_NUMERICHOST
) != 0) {
229 strncat(buf
, "<unknown>", buflen
- 1);
233 assert(addr
->family
== AF_INET
);
234 a
.s_addr
= htonl(addr
->address
);
235 strncpy(buf
, inet_ntoa(a
), buflen
);
236 buf
[buflen
-1] = '\0';
241 int sk_hostname_is_local(char *name
)
243 return !strcmp(name
, "localhost");
246 int sk_address_is_local(SockAddr addr
)
249 if (addr
->family
== AF_UNSPEC
)
250 return 0; /* we don't know; assume not */
253 if (addr
->family
== AF_INET
)
254 return ipv4_is_loopback(
255 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
);
256 else if (addr
->family
== AF_INET6
)
257 return IN6_IS_ADDR_LOOPBACK(
258 &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
);
263 assert(addr
->family
== AF_INET
);
264 a
.s_addr
= htonl(addr
->address
);
265 return ipv4_is_loopback(a
);
270 int sk_addrtype(SockAddr addr
)
272 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
:
274 addr
->family
== AF_INET6 ? ADDRTYPE_IPV6
:
279 void sk_addrcopy(SockAddr addr
, char *buf
)
283 if (addr
->family
== AF_INET
)
284 memcpy(buf
, &((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
,
285 sizeof(struct in_addr
));
286 else if (addr
->family
== AF_INET6
)
287 memcpy(buf
, &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
,
288 sizeof(struct in6_addr
));
294 assert(addr
->family
== AF_INET
);
295 a
.s_addr
= htonl(addr
->address
);
296 memcpy(buf
, (char*) &a
.s_addr
, 4);
300 void sk_addr_free(SockAddr addr
)
304 if (addr
->ai
!= NULL
)
305 freeaddrinfo(addr
->ai
);
310 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
312 Actual_Socket s
= (Actual_Socket
) sock
;
319 static void sk_tcp_flush(Socket s
)
322 * We send data to the socket as soon as we can anyway,
323 * so we don't need to do anything here. :-)
327 static void sk_tcp_close(Socket s
);
328 static int sk_tcp_write(Socket s
, const char *data
, int len
);
329 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
330 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
331 static void *sk_tcp_get_private_ptr(Socket s
);
332 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
333 static const char *sk_tcp_socket_error(Socket s
);
335 static struct socket_function_table tcp_fn_table
= {
341 sk_tcp_set_private_ptr
,
342 sk_tcp_get_private_ptr
,
347 Socket
sk_register(OSSocket sockfd
, Plug plug
)
352 * Create Socket structure.
354 ret
= snew(struct Socket_tag
);
355 ret
->fn
= &tcp_fn_table
;
358 bufchain_init(&ret
->output_data
);
359 ret
->writable
= 1; /* to start with */
360 ret
->sending_oob
= 0;
362 ret
->frozen_readable
= 0;
363 ret
->localhost_only
= 0; /* unused, but best init anyway */
364 ret
->pending_error
= 0;
365 ret
->oobpending
= FALSE
;
371 ret
->error
= error_string(errno
);
383 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
384 int nodelay
, int keepalive
, Plug plug
)
388 struct sockaddr_in6 a6
;
390 struct sockaddr_in a
;
391 struct sockaddr_un au
;
392 const struct sockaddr
*sa
;
399 * Create Socket structure.
401 ret
= snew(struct Socket_tag
);
402 ret
->fn
= &tcp_fn_table
;
405 bufchain_init(&ret
->output_data
);
406 ret
->connected
= 0; /* to start with */
407 ret
->writable
= 0; /* to start with */
408 ret
->sending_oob
= 0;
410 ret
->frozen_readable
= 0;
411 ret
->localhost_only
= 0; /* unused, but best init anyway */
412 ret
->pending_error
= 0;
413 ret
->oobpending
= FALSE
;
419 assert(addr
->family
!= AF_UNSPEC
);
420 s
= socket(addr
->family
, SOCK_STREAM
, 0);
424 ret
->error
= error_string(errno
);
428 ret
->oobinline
= oobinline
;
431 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
436 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
441 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
445 * Bind to local address.
448 localport
= 1023; /* count from 1023 downwards */
450 localport
= 0; /* just use port 0 (ie kernel picks) */
452 /* BSD IP stacks need sockaddr_in zeroed before filling in */
453 memset(&a
,'\0',sizeof(struct sockaddr_in
));
455 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
458 /* We don't try to bind to a local address for UNIX domain sockets. (Why
459 * do we bother doing the bind when localport == 0 anyway?) */
460 if(addr
->family
!= AF_UNIX
) {
461 /* Loop round trying to bind */
466 if (addr
->family
== AF_INET6
) {
467 /* XXX use getaddrinfo to get a local address? */
468 a6
.sin6_family
= AF_INET6
;
469 a6
.sin6_addr
= in6addr_any
;
470 a6
.sin6_port
= htons(localport
);
471 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
475 assert(addr
->family
== AF_INET
);
476 a
.sin_family
= AF_INET
;
477 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
478 a
.sin_port
= htons(localport
);
479 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
486 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
491 break; /* we're only looping once */
494 break; /* we might have got to the end */
498 ret
->error
= error_string(err
);
504 * Connect to remote address.
506 switch(addr
->family
) {
509 /* XXX would be better to have got getaddrinfo() to fill in the port. */
510 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_port
=
512 sa
= (const struct sockaddr
*)addr
->ai
->ai_addr
;
513 salen
= addr
->ai
->ai_addrlen
;
516 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_port
=
518 sa
= (const struct sockaddr
*)addr
->ai
->ai_addr
;
519 salen
= addr
->ai
->ai_addrlen
;
523 a
.sin_family
= AF_INET
;
524 a
.sin_addr
.s_addr
= htonl(addr
->address
);
525 a
.sin_port
= htons((short) port
);
526 sa
= (const struct sockaddr
*)&a
;
531 assert(port
== 0); /* to catch confused people */
532 assert(strlen(addr
->hostname
) < sizeof au
.sun_path
);
533 memset(&au
, 0, sizeof au
);
534 au
.sun_family
= AF_UNIX
;
535 strcpy(au
.sun_path
, addr
->hostname
);
536 sa
= (const struct sockaddr
*)&au
;
541 assert(0 && "unknown address family");
544 fl
= fcntl(s
, F_GETFL
);
546 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
548 if ((connect(s
, sa
, salen
)) < 0) {
549 if ( errno
!= EINPROGRESS
) {
550 ret
->error
= error_string(errno
);
555 * If we _don't_ get EWOULDBLOCK, the connect has completed
556 * and we should set the socket as connected and writable.
570 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int address_family
)
574 struct addrinfo hints
, *ai
;
577 struct sockaddr_in a
;
584 * Create Socket structure.
586 ret
= snew(struct Socket_tag
);
587 ret
->fn
= &tcp_fn_table
;
590 bufchain_init(&ret
->output_data
);
591 ret
->writable
= 0; /* to start with */
592 ret
->sending_oob
= 0;
594 ret
->frozen_readable
= 0;
595 ret
->localhost_only
= local_host_only
;
596 ret
->pending_error
= 0;
597 ret
->oobpending
= FALSE
;
601 * Translate address_family from platform-independent constants
602 * into local reality.
604 address_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
605 address_family
== ADDRTYPE_IPV6 ? AF_INET6
: AF_UNSPEC
);
608 /* Let's default to IPv6.
609 * If the stack doesn't support IPv6, we will fall back to IPv4. */
610 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
612 /* No other choice, default to IPv4 */
613 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
619 s
= socket(address_family
, SOCK_STREAM
, 0);
621 /* If the host doesn't support IPv6 try fallback to IPv4. */
622 if (s
< 0 && address_family
== AF_INET6
) {
623 address_family
= AF_INET
;
624 s
= socket(address_family
, SOCK_STREAM
, 0);
629 ret
->error
= error_string(errno
);
635 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
637 /* BSD IP stacks need sockaddr_in zeroed before filling in */
638 memset(&a
,'\0',sizeof(struct sockaddr_in
));
641 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
643 hints
.ai_flags
= AI_NUMERICHOST
;
644 hints
.ai_family
= address_family
;
645 hints
.ai_socktype
= 0;
646 hints
.ai_protocol
= 0;
647 hints
.ai_addrlen
= 0;
648 hints
.ai_addr
= NULL
;
649 hints
.ai_canonname
= NULL
;
650 hints
.ai_next
= NULL
;
651 sprintf(portstr
, "%d", port
);
652 if (srcaddr
!= NULL
&& getaddrinfo(srcaddr
, portstr
, &hints
, &ai
) == 0)
653 retcode
= bind(s
, ai
->ai_addr
, ai
->ai_addrlen
);
658 * FIXME: Need two listening sockets, in principle, one for v4
662 a6
.sin6_addr
= in6addr_loopback
;
664 a6
.sin6_addr
= in6addr_any
;
665 a6
.sin6_port
= htons(port
);
671 a
.sin_family
= AF_INET
;
674 * Bind to source address. First try an explicitly
678 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
679 if (a
.sin_addr
.s_addr
!= INADDR_NONE
) {
680 /* Override localhost_only with specified listen addr. */
681 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
687 * ... and failing that, go with one of the standard ones.
691 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
693 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
696 a
.sin_port
= htons((short)port
);
697 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
707 ret
->error
= error_string(err
);
712 if (listen(s
, SOMAXCONN
) < 0) {
714 ret
->error
= error_string(errno
);
724 static void sk_tcp_close(Socket sock
)
726 Actual_Socket s
= (Actual_Socket
) sock
;
734 int sk_getxdmdata(void *sock
, unsigned long *ip
, int *port
)
736 Actual_Socket s
= (Actual_Socket
) sock
;
737 struct sockaddr_in addr
;
741 * We must check that this socket really _is_ an Actual_Socket.
743 if (s
->fn
!= &tcp_fn_table
)
744 return 0; /* failure */
746 addrlen
= sizeof(addr
);
747 if (getsockname(s
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
749 switch(addr
.sin_family
) {
751 *ip
= ntohl(addr
.sin_addr
.s_addr
);
752 *port
= ntohs(addr
.sin_port
);
756 * For a Unix socket, we return 0xFFFFFFFF for the IP address and
757 * our current pid for the port. Bizarre, but such is life.
759 *ip
= ntohl(0xFFFFFFFF);
773 * The function which tries to send on a socket once it's deemed
776 void try_send(Actual_Socket s
)
778 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
784 if (s
->sending_oob
) {
785 urgentflag
= MSG_OOB
;
786 len
= s
->sending_oob
;
790 bufchain_prefix(&s
->output_data
, &data
, &len
);
792 nsent
= send(s
->s
, data
, len
, urgentflag
);
793 noise_ultralight(nsent
);
795 err
= (nsent
< 0 ? errno
: 0);
796 if (err
== EWOULDBLOCK
) {
798 * Perfectly normal: we've sent all we can for the moment.
802 } else if (nsent
== 0 ||
803 err
== ECONNABORTED
|| err
== ECONNRESET
) {
805 * If send() returns CONNABORTED or CONNRESET, we
806 * unfortunately can't just call plug_closing(),
807 * because it's quite likely that we're currently
808 * _in_ a call from the code we'd be calling back
809 * to, so we'd have to make half the SSH code
810 * reentrant. Instead we flag a pending error on
811 * the socket, to be dealt with (by calling
812 * plug_closing()) at some suitable future moment.
814 s
->pending_error
= err
;
817 /* We're inside the Unix frontend here, so we know
818 * that the frontend handle is unnecessary. */
819 logevent(NULL
, error_string(err
));
820 fatalbox("%s", error_string(err
));
823 if (s
->sending_oob
) {
825 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
826 s
->sending_oob
= len
- nsent
;
831 bufchain_consume(&s
->output_data
, nsent
);
838 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
840 Actual_Socket s
= (Actual_Socket
) sock
;
843 * Add the data to the buffer list on the socket.
845 bufchain_add(&s
->output_data
, buf
, len
);
848 * Now try sending from the start of the buffer list.
854 * Update the select() status to correctly reflect whether or
855 * not we should be selecting for write.
859 return bufchain_size(&s
->output_data
);
862 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
864 Actual_Socket s
= (Actual_Socket
) sock
;
867 * Replace the buffer list on the socket with the data.
869 bufchain_clear(&s
->output_data
);
870 assert(len
<= sizeof(s
->oobdata
));
871 memcpy(s
->oobdata
, buf
, len
);
872 s
->sending_oob
= len
;
875 * Now try sending from the start of the buffer list.
881 * Update the select() status to correctly reflect whether or
882 * not we should be selecting for write.
886 return s
->sending_oob
;
889 static int net_select_result(int fd
, int event
)
893 char buf
[20480]; /* nice big buffer for plenty of speed */
897 /* Find the Socket structure */
898 s
= find234(sktree
, &fd
, cmpforsearch
);
900 return 1; /* boggle */
902 noise_ultralight(event
);
905 case 4: /* exceptional */
908 * On a non-oobinline socket, this indicates that we
909 * can immediately perform an OOB read and get back OOB
910 * data, which we will send to the back end with
911 * type==2 (urgent data).
913 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
914 noise_ultralight(ret
);
916 const char *str
= (ret
== 0 ?
"Internal networking trouble" :
917 error_string(errno
));
918 /* We're inside the Unix frontend here, so we know
919 * that the frontend handle is unnecessary. */
923 return plug_receive(s
->plug
, 2, buf
, ret
);
929 * If we reach here, this is an oobinline socket, which
930 * means we should set s->oobpending and then deal with it
931 * when we get called for the readability event (which
932 * should also occur).
934 s
->oobpending
= TRUE
;
936 case 1: /* readable; also acceptance */
939 * On a listening socket, the readability event means a
940 * connection is ready to be accepted.
942 struct sockaddr_in isa
;
943 int addrlen
= sizeof(struct sockaddr_in
);
944 int t
; /* socket of connection */
946 memset(&isa
, 0, sizeof(struct sockaddr_in
));
948 t
= accept(s
->s
,(struct sockaddr
*)&isa
,(socklen_t
*) &addrlen
);
953 if (s
->localhost_only
&& !ipv4_is_loopback(isa
.sin_addr
)) {
954 close(t
); /* someone let nonlocal through?! */
955 } else if (plug_accepting(s
->plug
, t
)) {
956 close(t
); /* denied or error */
962 * If we reach here, this is not a listening socket, so
963 * readability really means readability.
966 /* In the case the socket is still frozen, we don't even bother */
968 s
->frozen_readable
= 1;
973 * We have received data on the socket. For an oobinline
974 * socket, this might be data _before_ an urgent pointer,
975 * in which case we send it to the back end with type==1
976 * (data prior to urgent).
978 if (s
->oobinline
&& s
->oobpending
) {
980 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
981 s
->oobpending
= FALSE
; /* clear this indicator */
985 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
986 noise_ultralight(ret
);
988 if (errno
== EWOULDBLOCK
) {
993 return plug_closing(s
->plug
, error_string(errno
), errno
, 0);
994 } else if (0 == ret
) {
995 return plug_closing(s
->plug
, NULL
, 0, 0);
997 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1000 case 2: /* writable */
1001 if (!s
->connected
) {
1003 * select() reports a socket as _writable_ when an
1004 * asynchronous connection is completed.
1006 s
->connected
= s
->writable
= 1;
1010 int bufsize_before
, bufsize_after
;
1012 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1014 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1015 if (bufsize_after
< bufsize_before
)
1016 plug_sent(s
->plug
, bufsize_after
);
1025 * Deal with socket errors detected in try_send().
1027 void net_pending_errors(void)
1033 * This might be a fiddly business, because it's just possible
1034 * that handling a pending error on one socket might cause
1035 * others to be closed. (I can't think of any reason this might
1036 * happen in current SSH implementation, but to maintain
1037 * generality of this network layer I'll assume the worst.)
1039 * So what we'll do is search the socket list for _one_ socket
1040 * with a pending error, and then handle it, and then search
1041 * the list again _from the beginning_. Repeat until we make a
1042 * pass with no socket errors present. That way we are
1043 * protected against the socket list changing under our feet.
1047 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1048 if (s
->pending_error
) {
1050 * An error has occurred on this socket. Pass it to the
1053 plug_closing(s
->plug
, error_string(s
->pending_error
),
1054 s
->pending_error
, 0);
1062 * Each socket abstraction contains a `void *' private field in
1063 * which the client can keep state.
1065 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1067 Actual_Socket s
= (Actual_Socket
) sock
;
1068 s
->private_ptr
= ptr
;
1071 static void *sk_tcp_get_private_ptr(Socket sock
)
1073 Actual_Socket s
= (Actual_Socket
) sock
;
1074 return s
->private_ptr
;
1078 * Special error values are returned from sk_namelookup and sk_new
1079 * if there's a problem. These functions extract an error message,
1080 * or return NULL if there's no problem.
1082 const char *sk_addr_error(SockAddr addr
)
1086 static const char *sk_tcp_socket_error(Socket sock
)
1088 Actual_Socket s
= (Actual_Socket
) sock
;
1092 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1094 Actual_Socket s
= (Actual_Socket
) sock
;
1095 if (s
->frozen
== is_frozen
)
1097 s
->frozen
= is_frozen
;
1098 if (!is_frozen
&& s
->frozen_readable
) {
1100 recv(s
->s
, &c
, 1, MSG_PEEK
);
1102 s
->frozen_readable
= 0;
1106 static void uxsel_tell(Actual_Socket s
)
1110 rwx
|= 2; /* write == connect */
1111 if (s
->connected
&& !s
->frozen
)
1112 rwx
|= 1 | 4; /* read, except */
1113 if (bufchain_size(&s
->output_data
))
1114 rwx
|= 2; /* write */
1116 rwx
|= 1; /* read == accept */
1117 uxsel_set(s
->s
, rwx
, net_select_result
);
1120 int net_service_lookup(char *service
)
1123 se
= getservbyname(service
, NULL
);
1125 return ntohs(se
->s_port
);
1130 SockAddr
platform_get_x11_unix_address(int displaynum
, char **canonicalname
)
1132 SockAddr ret
= snew(struct SockAddr_tag
);
1135 memset(ret
, 0, sizeof *ret
);
1136 ret
->family
= AF_UNIX
;
1137 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1138 "%s%d", X11_UNIX_PATH
, displaynum
);
1140 ret
->error
= "snprintf failed";
1141 else if(n
>= sizeof ret
->hostname
)
1142 ret
->error
= "X11 UNIX name too long";
1144 *canonicalname
= dupstr(ret
->hostname
);