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 struct socket_function_table
*fn
;
36 /* the above variable absolutely *must* be the first in this structure */
42 int connected
; /* irrelevant for listening sockets */
44 int frozen
; /* this causes readability notifications to be ignored */
45 int frozen_readable
; /* this means we missed at least one readability
46 * notification while we were frozen */
47 int localhost_only
; /* for listening sockets */
50 int oobpending
; /* is there OOB data available to read? */
52 int pending_error
; /* in case send() returns error */
54 int nodelay
, keepalive
; /* for connect()-type sockets */
55 int privport
, port
; /* and again */
60 * We used to typedef struct Socket_tag *Socket.
62 * Since we have made the networking abstraction slightly more
63 * abstract, Socket no longer means a tcp socket (it could mean
64 * an ssl socket). So now we must use Actual_Socket when we know
65 * we are talking about a tcp socket.
67 typedef struct Socket_tag
*Actual_Socket
;
72 * Which address family this address belongs to. AF_INET for
73 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
74 * resolution has not been done and a simple host name is held
75 * in this SockAddr structure.
79 struct addrinfo
*ais
; /* Addresses IPv6 style. */
80 struct addrinfo
*ai
; /* steps along the linked list */
82 unsigned long *addresses
; /* Addresses IPv4 style. */
83 int naddresses
, curraddr
;
85 char hostname
[512]; /* Store an unresolved host name. */
88 static tree234
*sktree
;
90 static void uxsel_tell(Actual_Socket s
);
92 static int cmpfortree(void *av
, void *bv
)
94 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
95 int as
= a
->s
, bs
= b
->s
;
103 static int cmpforsearch(void *av
, void *bv
)
105 Actual_Socket b
= (Actual_Socket
) bv
;
106 int as
= *(int *)av
, bs
= b
->s
;
116 sktree
= newtree234(cmpfortree
);
119 void sk_cleanup(void)
125 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
131 SockAddr
sk_namelookup(const char *host
, char **canonicalname
, int address_family
)
133 SockAddr ret
= snew(struct SockAddr_tag
);
135 struct addrinfo hints
;
139 struct hostent
*h
= NULL
;
144 /* Clear the structure and default to IPv4. */
145 memset(ret
, 0, sizeof(struct SockAddr_tag
));
146 ret
->family
= 0; /* We set this one when we have resolved the host. */
151 hints
.ai_flags
= AI_CANONNAME
;
152 hints
.ai_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
153 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
155 hints
.ai_socktype
= SOCK_STREAM
;
156 hints
.ai_protocol
= 0;
157 hints
.ai_addrlen
= 0;
158 hints
.ai_addr
= NULL
;
159 hints
.ai_canonname
= NULL
;
160 hints
.ai_next
= NULL
;
161 err
= getaddrinfo(host
, NULL
, &hints
, &ret
->ais
);
164 ret
->error
= gai_strerror(err
);
167 ret
->family
= ret
->ai
->ai_family
;
169 if (ret
->ai
->ai_canonname
!= NULL
)
170 strncat(realhost
, ret
->ai
->ai_canonname
, sizeof(realhost
) - 1);
172 strncat(realhost
, host
, sizeof(realhost
) - 1);
174 if ((a
= inet_addr(host
)) == (unsigned long)(in_addr_t
)(-1)) {
176 * Otherwise use the IPv4-only gethostbyname... (NOTE:
177 * we don't use gethostbyname as a fallback!)
179 if (ret
->family
== 0) {
180 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
181 if ( (h
= gethostbyname(host
)) )
182 ret
->family
= AF_INET
;
184 if (ret
->family
== 0) {
185 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
186 h_errno
== NO_DATA
||
187 h_errno
== NO_ADDRESS ?
"Host does not exist" :
188 h_errno
== TRY_AGAIN ?
189 "Temporary name service failure" :
190 "gethostbyname: unknown error");
193 /* This way we are always sure the h->h_name is valid :) */
194 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
195 for (n
= 0; h
->h_addr_list
[n
]; n
++);
196 ret
->addresses
= snewn(n
, unsigned long);
198 for (n
= 0; n
< ret
->naddresses
; n
++) {
199 memcpy(&a
, h
->h_addr_list
[n
], sizeof(a
));
200 ret
->addresses
[n
] = ntohl(a
);
204 * This must be a numeric IPv4 address because it caused a
205 * success return from inet_addr.
207 ret
->family
= AF_INET
;
208 strncpy(realhost
, host
, sizeof(realhost
));
209 ret
->addresses
= snew(unsigned long);
211 ret
->addresses
[0] = ntohl(a
);
215 realhost
[lenof(realhost
)-1] = '\0';
216 *canonicalname
= snewn(1+strlen(realhost
), char);
217 strcpy(*canonicalname
, realhost
);
221 SockAddr
sk_nonamelookup(const char *host
)
223 SockAddr ret
= snew(struct SockAddr_tag
);
225 ret
->family
= AF_UNSPEC
;
226 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
227 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
231 ret
->addresses
= NULL
;
236 static int sk_nextaddr(SockAddr addr
)
239 if (addr
->ai
&& addr
->ai
->ai_next
) {
240 addr
->ai
= addr
->ai
->ai_next
;
241 addr
->family
= addr
->ai
->ai_family
;
246 if (addr
->curraddr
+1 < addr
->naddresses
) {
255 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
258 if (addr
->family
== AF_UNSPEC
) {
259 strncpy(buf
, addr
->hostname
, buflen
);
260 buf
[buflen
-1] = '\0';
263 if (getnameinfo(addr
->ai
->ai_addr
, addr
->ai
->ai_addrlen
, buf
, buflen
,
264 NULL
, 0, NI_NUMERICHOST
) != 0) {
266 strncat(buf
, "<unknown>", buflen
- 1);
270 assert(addr
->family
== AF_INET
);
271 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
272 strncpy(buf
, inet_ntoa(a
), buflen
);
273 buf
[buflen
-1] = '\0';
278 int sk_hostname_is_local(char *name
)
280 return !strcmp(name
, "localhost");
283 #define ipv4_is_loopback(addr) \
284 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
286 static int sockaddr_is_loopback(struct sockaddr
*sa
)
288 struct sockaddr_in
*sin
;
290 struct sockaddr_in6
*sin6
;
293 switch (sa
->sa_family
) {
295 sin
= (struct sockaddr_in
*)sa
;
296 return ipv4_is_loopback(sin
->sin_addr
);
299 sin6
= (struct sockaddr_in6
*)sa
;
300 return IN6_IS_ADDR_LOOPBACK(&sin6
->sin6_addr
);
309 int sk_address_is_local(SockAddr addr
)
312 if (addr
->family
== AF_UNSPEC
)
313 return 0; /* we don't know; assume not */
316 return sockaddr_is_loopback(addr
->ai
->ai_addr
);
319 assert(addr
->family
== AF_INET
);
320 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
321 return ipv4_is_loopback(a
);
326 int sk_addrtype(SockAddr addr
)
328 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
:
330 addr
->family
== AF_INET6 ? ADDRTYPE_IPV6
:
335 void sk_addrcopy(SockAddr addr
, char *buf
)
339 if (addr
->family
== AF_INET
)
340 memcpy(buf
, &((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
,
341 sizeof(struct in_addr
));
342 else if (addr
->family
== AF_INET6
)
343 memcpy(buf
, &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
,
344 sizeof(struct in6_addr
));
350 assert(addr
->family
== AF_INET
);
351 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
352 memcpy(buf
, (char*) &a
.s_addr
, 4);
356 void sk_addr_free(SockAddr addr
)
360 if (addr
->ais
!= NULL
)
361 freeaddrinfo(addr
->ais
);
363 sfree(addr
->addresses
);
368 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
370 Actual_Socket s
= (Actual_Socket
) sock
;
377 static void sk_tcp_flush(Socket s
)
380 * We send data to the socket as soon as we can anyway,
381 * so we don't need to do anything here. :-)
385 static void sk_tcp_close(Socket s
);
386 static int sk_tcp_write(Socket s
, const char *data
, int len
);
387 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
388 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
389 static void *sk_tcp_get_private_ptr(Socket s
);
390 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
391 static const char *sk_tcp_socket_error(Socket s
);
393 static struct socket_function_table tcp_fn_table
= {
399 sk_tcp_set_private_ptr
,
400 sk_tcp_get_private_ptr
,
405 Socket
sk_register(OSSocket sockfd
, Plug plug
)
410 * Create Socket structure.
412 ret
= snew(struct Socket_tag
);
413 ret
->fn
= &tcp_fn_table
;
416 bufchain_init(&ret
->output_data
);
417 ret
->writable
= 1; /* to start with */
418 ret
->sending_oob
= 0;
420 ret
->frozen_readable
= 0;
421 ret
->localhost_only
= 0; /* unused, but best init anyway */
422 ret
->pending_error
= 0;
423 ret
->oobpending
= FALSE
;
431 ret
->error
= strerror(errno
);
443 static int try_connect(Actual_Socket sock
)
447 struct sockaddr_in6 a6
;
449 struct sockaddr_in a
;
450 struct sockaddr_un au
;
451 const struct sockaddr
*sa
;
459 plug_log(sock
->plug
, 0, sock
->addr
, sock
->port
, NULL
, 0);
464 assert(sock
->addr
->family
!= AF_UNSPEC
);
465 s
= socket(sock
->addr
->family
, SOCK_STREAM
, 0);
473 if (sock
->oobinline
) {
475 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
480 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
483 if (sock
->keepalive
) {
485 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
489 * Bind to local address.
492 localport
= 1023; /* count from 1023 downwards */
494 localport
= 0; /* just use port 0 (ie kernel picks) */
496 /* BSD IP stacks need sockaddr_in zeroed before filling in */
497 memset(&a
,'\0',sizeof(struct sockaddr_in
));
499 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
502 /* We don't try to bind to a local address for UNIX domain sockets. (Why
503 * do we bother doing the bind when localport == 0 anyway?) */
504 if(sock
->addr
->family
!= AF_UNIX
) {
505 /* Loop round trying to bind */
510 if (sock
->addr
->family
== AF_INET6
) {
511 /* XXX use getaddrinfo to get a local address? */
512 a6
.sin6_family
= AF_INET6
;
513 a6
.sin6_addr
= in6addr_any
;
514 a6
.sin6_port
= htons(localport
);
515 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
519 assert(sock
->addr
->family
== AF_INET
);
520 a
.sin_family
= AF_INET
;
521 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
522 a
.sin_port
= htons(localport
);
523 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
530 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
535 break; /* we're only looping once */
538 break; /* we might have got to the end */
546 * Connect to remote address.
548 switch(sock
->addr
->family
) {
551 /* XXX would be better to have got getaddrinfo() to fill in the port. */
552 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
554 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
555 salen
= sock
->addr
->ai
->ai_addrlen
;
558 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
560 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
561 salen
= sock
->addr
->ai
->ai_addrlen
;
565 a
.sin_family
= AF_INET
;
566 a
.sin_addr
.s_addr
= htonl(sock
->addr
->addresses
[sock
->addr
->curraddr
]);
567 a
.sin_port
= htons((short) sock
->port
);
568 sa
= (const struct sockaddr
*)&a
;
573 assert(sock
->port
== 0); /* to catch confused people */
574 assert(strlen(sock
->addr
->hostname
) < sizeof au
.sun_path
);
575 memset(&au
, 0, sizeof au
);
576 au
.sun_family
= AF_UNIX
;
577 strcpy(au
.sun_path
, sock
->addr
->hostname
);
578 sa
= (const struct sockaddr
*)&au
;
583 assert(0 && "unknown address family");
584 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
587 fl
= fcntl(s
, F_GETFL
);
589 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
591 if ((connect(s
, sa
, salen
)) < 0) {
592 if ( errno
!= EINPROGRESS
) {
598 * If we _don't_ get EWOULDBLOCK, the connect has completed
599 * and we should set the socket as connected and writable.
606 add234(sktree
, sock
);
610 plug_log(sock
->plug
, 1, sock
->addr
, sock
->port
, strerror(err
), err
);
614 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
615 int nodelay
, int keepalive
, Plug plug
)
621 * Create Socket structure.
623 ret
= snew(struct Socket_tag
);
624 ret
->fn
= &tcp_fn_table
;
627 bufchain_init(&ret
->output_data
);
628 ret
->connected
= 0; /* to start with */
629 ret
->writable
= 0; /* to start with */
630 ret
->sending_oob
= 0;
632 ret
->frozen_readable
= 0;
633 ret
->localhost_only
= 0; /* unused, but best init anyway */
634 ret
->pending_error
= 0;
635 ret
->oobpending
= FALSE
;
639 ret
->oobinline
= oobinline
;
640 ret
->nodelay
= nodelay
;
641 ret
->keepalive
= keepalive
;
642 ret
->privport
= privport
;
647 err
= try_connect(ret
);
648 } while (err
&& sk_nextaddr(ret
->addr
));
651 ret
->error
= strerror(err
);
656 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int address_family
)
660 struct addrinfo hints
, *ai
;
662 struct sockaddr_in6 a6
;
664 struct sockaddr
*addr
;
666 struct sockaddr_in a
;
672 * Create Socket structure.
674 ret
= snew(struct Socket_tag
);
675 ret
->fn
= &tcp_fn_table
;
678 bufchain_init(&ret
->output_data
);
679 ret
->writable
= 0; /* to start with */
680 ret
->sending_oob
= 0;
682 ret
->frozen_readable
= 0;
683 ret
->localhost_only
= local_host_only
;
684 ret
->pending_error
= 0;
685 ret
->oobpending
= FALSE
;
690 * Translate address_family from platform-independent constants
691 * into local reality.
693 address_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
695 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
700 /* Let's default to IPv6.
701 * If the stack doesn't support IPv6, we will fall back to IPv4. */
702 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
704 /* No other choice, default to IPv4 */
705 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
711 s
= socket(address_family
, SOCK_STREAM
, 0);
714 /* If the host doesn't support IPv6 try fallback to IPv4. */
715 if (s
< 0 && address_family
== AF_INET6
) {
716 address_family
= AF_INET
;
717 s
= socket(address_family
, SOCK_STREAM
, 0);
722 ret
->error
= strerror(errno
);
728 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
731 addr
= NULL
; addrlen
= -1; /* placate optimiser */
733 if (srcaddr
!= NULL
) {
735 hints
.ai_flags
= AI_NUMERICHOST
;
736 hints
.ai_family
= address_family
;
737 hints
.ai_socktype
= SOCK_STREAM
;
738 hints
.ai_protocol
= 0;
739 hints
.ai_addrlen
= 0;
740 hints
.ai_addr
= NULL
;
741 hints
.ai_canonname
= NULL
;
742 hints
.ai_next
= NULL
;
743 assert(port
>= 0 && port
<= 99999);
744 sprintf(portstr
, "%d", port
);
745 retcode
= getaddrinfo(srcaddr
, portstr
, &hints
, &ai
);
748 addrlen
= ai
->ai_addrlen
;
751 memset(&a
,'\0',sizeof(struct sockaddr_in
));
752 a
.sin_family
= AF_INET
;
753 a
.sin_port
= htons(port
);
754 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
755 if (a
.sin_addr
.s_addr
!= (in_addr_t
)(-1)) {
756 /* Override localhost_only with specified listen addr. */
757 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
759 addr
= (struct sockaddr
*)&a
;
767 if (address_family
== AF_INET6
) {
768 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
769 a6
.sin6_family
= AF_INET6
;
770 a6
.sin6_port
= htons(port
);
772 a6
.sin6_addr
= in6addr_loopback
;
774 a6
.sin6_addr
= in6addr_any
;
775 addr
= (struct sockaddr
*)&a6
;
776 addrlen
= sizeof(a6
);
780 memset(&a
,'\0',sizeof(struct sockaddr_in
));
781 a
.sin_family
= AF_INET
;
782 a
.sin_port
= htons(port
);
784 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
786 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
787 addr
= (struct sockaddr
*)&a
;
792 retcode
= bind(s
, addr
, addrlen
);
795 ret
->error
= strerror(errno
);
799 if (listen(s
, SOMAXCONN
) < 0) {
801 ret
->error
= strerror(errno
);
813 static void sk_tcp_close(Socket sock
)
815 Actual_Socket s
= (Actual_Socket
) sock
;
821 sk_addr_free(s
->addr
);
825 void *sk_getxdmdata(void *sock
, int *lenp
)
827 Actual_Socket s
= (Actual_Socket
) sock
;
829 struct sockaddr_in addr
;
831 struct sockaddr_storage addr
;
832 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)&addr
;
834 struct sockaddr
*sa
= (struct sockaddr
*)&addr
;
835 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&addr
;
838 static unsigned int unix_addr
= 0xFFFFFFFF;
841 * We must check that this socket really _is_ an Actual_Socket.
843 if (s
->fn
!= &tcp_fn_table
)
844 return NULL
; /* failure */
846 addrlen
= sizeof(addr
);
847 if (getsockname(s
->s
, sa
, &addrlen
) < 0)
849 switch(sa
->sa_family
) {
852 buf
= snewn(*lenp
, char);
853 PUT_32BIT_MSB_FIRST(buf
, ntohl(sin
->sin_addr
.s_addr
));
854 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin
->sin_port
));
859 buf
= snewn(*lenp
, char);
860 if (IN6_IS_ADDR_V4MAPPED(&sin6
->sin6_addr
)) {
861 memcpy(buf
, sin6
->sin6_addr
.s6_addr
+ 12, 4);
862 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin6
->sin6_port
));
864 /* This is stupid, but it's what XLib does. */
870 buf
= snewn(*lenp
, char);
871 PUT_32BIT_MSB_FIRST(buf
, unix_addr
--);
872 PUT_16BIT_MSB_FIRST(buf
+4, getpid());
885 * The function which tries to send on a socket once it's deemed
888 void try_send(Actual_Socket s
)
890 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
896 if (s
->sending_oob
) {
897 urgentflag
= MSG_OOB
;
898 len
= s
->sending_oob
;
902 bufchain_prefix(&s
->output_data
, &data
, &len
);
904 nsent
= send(s
->s
, data
, len
, urgentflag
);
905 noise_ultralight(nsent
);
907 err
= (nsent
< 0 ? errno
: 0);
908 if (err
== EWOULDBLOCK
) {
910 * Perfectly normal: we've sent all we can for the moment.
916 * We unfortunately can't just call plug_closing(),
917 * because it's quite likely that we're currently
918 * _in_ a call from the code we'd be calling back
919 * to, so we'd have to make half the SSH code
920 * reentrant. Instead we flag a pending error on
921 * the socket, to be dealt with (by calling
922 * plug_closing()) at some suitable future moment.
924 s
->pending_error
= err
;
928 if (s
->sending_oob
) {
930 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
931 s
->sending_oob
= len
- nsent
;
936 bufchain_consume(&s
->output_data
, nsent
);
943 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
945 Actual_Socket s
= (Actual_Socket
) sock
;
948 * Add the data to the buffer list on the socket.
950 bufchain_add(&s
->output_data
, buf
, len
);
953 * Now try sending from the start of the buffer list.
959 * Update the select() status to correctly reflect whether or
960 * not we should be selecting for write.
964 return bufchain_size(&s
->output_data
);
967 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
969 Actual_Socket s
= (Actual_Socket
) sock
;
972 * Replace the buffer list on the socket with the data.
974 bufchain_clear(&s
->output_data
);
975 assert(len
<= sizeof(s
->oobdata
));
976 memcpy(s
->oobdata
, buf
, len
);
977 s
->sending_oob
= len
;
980 * Now try sending from the start of the buffer list.
986 * Update the select() status to correctly reflect whether or
987 * not we should be selecting for write.
991 return s
->sending_oob
;
994 static int net_select_result(int fd
, int event
)
997 char buf
[20480]; /* nice big buffer for plenty of speed */
1001 /* Find the Socket structure */
1002 s
= find234(sktree
, &fd
, cmpforsearch
);
1004 return 1; /* boggle */
1006 noise_ultralight(event
);
1009 case 4: /* exceptional */
1010 if (!s
->oobinline
) {
1012 * On a non-oobinline socket, this indicates that we
1013 * can immediately perform an OOB read and get back OOB
1014 * data, which we will send to the back end with
1015 * type==2 (urgent data).
1017 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1018 noise_ultralight(ret
);
1020 return plug_closing(s
->plug
,
1021 ret
== 0 ?
"Internal networking trouble" :
1022 strerror(errno
), errno
, 0);
1025 * Receiving actual data on a socket means we can
1026 * stop falling back through the candidate
1027 * addresses to connect to.
1030 sk_addr_free(s
->addr
);
1033 return plug_receive(s
->plug
, 2, buf
, ret
);
1039 * If we reach here, this is an oobinline socket, which
1040 * means we should set s->oobpending and then deal with it
1041 * when we get called for the readability event (which
1042 * should also occur).
1044 s
->oobpending
= TRUE
;
1046 case 1: /* readable; also acceptance */
1049 * On a listening socket, the readability event means a
1050 * connection is ready to be accepted.
1053 struct sockaddr_in ss
;
1055 struct sockaddr_storage ss
;
1057 socklen_t addrlen
= sizeof(ss
);
1058 int t
; /* socket of connection */
1060 memset(&ss
, 0, addrlen
);
1061 t
= accept(s
->s
, (struct sockaddr
*)&ss
, &addrlen
);
1066 if (s
->localhost_only
&&
1067 !sockaddr_is_loopback((struct sockaddr
*)&ss
)) {
1068 close(t
); /* someone let nonlocal through?! */
1069 } else if (plug_accepting(s
->plug
, t
)) {
1070 close(t
); /* denied or error */
1076 * If we reach here, this is not a listening socket, so
1077 * readability really means readability.
1080 /* In the case the socket is still frozen, we don't even bother */
1082 s
->frozen_readable
= 1;
1087 * We have received data on the socket. For an oobinline
1088 * socket, this might be data _before_ an urgent pointer,
1089 * in which case we send it to the back end with type==1
1090 * (data prior to urgent).
1092 if (s
->oobinline
&& s
->oobpending
) {
1094 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
1095 s
->oobpending
= FALSE
; /* clear this indicator */
1099 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
1100 noise_ultralight(ret
);
1102 if (errno
== EWOULDBLOCK
) {
1108 * An error at this point _might_ be an error reported
1109 * by a non-blocking connect(). So before we return a
1110 * panic status to the user, let's just see whether
1115 plug_log(s
->plug
, 1, s
->addr
, s
->port
, strerror(err
), err
);
1116 while (s
->addr
&& sk_nextaddr(s
->addr
)) {
1117 err
= try_connect(s
);
1121 return plug_closing(s
->plug
, strerror(err
), err
, 0);
1122 } else if (0 == ret
) {
1123 return plug_closing(s
->plug
, NULL
, 0, 0);
1126 * Receiving actual data on a socket means we can
1127 * stop falling back through the candidate
1128 * addresses to connect to.
1131 sk_addr_free(s
->addr
);
1134 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1137 case 2: /* writable */
1138 if (!s
->connected
) {
1140 * select() reports a socket as _writable_ when an
1141 * asynchronous connection is completed.
1143 s
->connected
= s
->writable
= 1;
1147 int bufsize_before
, bufsize_after
;
1149 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1151 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1152 if (bufsize_after
< bufsize_before
)
1153 plug_sent(s
->plug
, bufsize_after
);
1162 * Deal with socket errors detected in try_send().
1164 void net_pending_errors(void)
1170 * This might be a fiddly business, because it's just possible
1171 * that handling a pending error on one socket might cause
1172 * others to be closed. (I can't think of any reason this might
1173 * happen in current SSH implementation, but to maintain
1174 * generality of this network layer I'll assume the worst.)
1176 * So what we'll do is search the socket list for _one_ socket
1177 * with a pending error, and then handle it, and then search
1178 * the list again _from the beginning_. Repeat until we make a
1179 * pass with no socket errors present. That way we are
1180 * protected against the socket list changing under our feet.
1184 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1185 if (s
->pending_error
) {
1187 * An error has occurred on this socket. Pass it to the
1190 plug_closing(s
->plug
, strerror(s
->pending_error
),
1191 s
->pending_error
, 0);
1199 * Each socket abstraction contains a `void *' private field in
1200 * which the client can keep state.
1202 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1204 Actual_Socket s
= (Actual_Socket
) sock
;
1205 s
->private_ptr
= ptr
;
1208 static void *sk_tcp_get_private_ptr(Socket sock
)
1210 Actual_Socket s
= (Actual_Socket
) sock
;
1211 return s
->private_ptr
;
1215 * Special error values are returned from sk_namelookup and sk_new
1216 * if there's a problem. These functions extract an error message,
1217 * or return NULL if there's no problem.
1219 const char *sk_addr_error(SockAddr addr
)
1223 static const char *sk_tcp_socket_error(Socket sock
)
1225 Actual_Socket s
= (Actual_Socket
) sock
;
1229 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1231 Actual_Socket s
= (Actual_Socket
) sock
;
1232 if (s
->frozen
== is_frozen
)
1234 s
->frozen
= is_frozen
;
1235 if (!is_frozen
&& s
->frozen_readable
) {
1237 recv(s
->s
, &c
, 1, MSG_PEEK
);
1239 s
->frozen_readable
= 0;
1243 static void uxsel_tell(Actual_Socket s
)
1247 rwx
|= 1; /* read == accept */
1250 rwx
|= 2; /* write == connect */
1251 if (s
->connected
&& !s
->frozen
)
1252 rwx
|= 1 | 4; /* read, except */
1253 if (bufchain_size(&s
->output_data
))
1254 rwx
|= 2; /* write */
1256 uxsel_set(s
->s
, rwx
, net_select_result
);
1259 int net_service_lookup(char *service
)
1262 se
= getservbyname(service
, NULL
);
1264 return ntohs(se
->s_port
);
1269 SockAddr
platform_get_x11_unix_address(int displaynum
, char **canonicalname
)
1271 SockAddr ret
= snew(struct SockAddr_tag
);
1274 memset(ret
, 0, sizeof *ret
);
1275 ret
->family
= AF_UNIX
;
1276 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1277 "%s%d", X11_UNIX_PATH
, displaynum
);
1279 ret
->error
= "snprintf failed";
1280 else if(n
>= sizeof ret
->hostname
)
1281 ret
->error
= "X11 UNIX name too long";
1283 *canonicalname
= dupstr(ret
->hostname
);
1285 ret
->ai
= ret
->ais
= NULL
;
1287 ret
->addresses
= NULL
;
1288 ret
->curraddr
= ret
->naddresses
= 0;