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);
475 if (sock
->oobinline
) {
477 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
482 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
485 if (sock
->keepalive
) {
487 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
491 * Bind to local address.
494 localport
= 1023; /* count from 1023 downwards */
496 localport
= 0; /* just use port 0 (ie kernel picks) */
498 /* BSD IP stacks need sockaddr_in zeroed before filling in */
499 memset(&a
,'\0',sizeof(struct sockaddr_in
));
501 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
504 /* We don't try to bind to a local address for UNIX domain sockets. (Why
505 * do we bother doing the bind when localport == 0 anyway?) */
506 if(sock
->addr
->family
!= AF_UNIX
) {
507 /* Loop round trying to bind */
512 if (sock
->addr
->family
== AF_INET6
) {
513 /* XXX use getaddrinfo to get a local address? */
514 a6
.sin6_family
= AF_INET6
;
515 a6
.sin6_addr
= in6addr_any
;
516 a6
.sin6_port
= htons(localport
);
517 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
521 assert(sock
->addr
->family
== AF_INET
);
522 a
.sin_family
= AF_INET
;
523 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
524 a
.sin_port
= htons(localport
);
525 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
532 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
537 break; /* we're only looping once */
540 break; /* we might have got to the end */
548 * Connect to remote address.
550 switch(sock
->addr
->family
) {
553 /* XXX would be better to have got getaddrinfo() to fill in the port. */
554 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
556 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
557 salen
= sock
->addr
->ai
->ai_addrlen
;
560 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
562 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
563 salen
= sock
->addr
->ai
->ai_addrlen
;
567 a
.sin_family
= AF_INET
;
568 a
.sin_addr
.s_addr
= htonl(sock
->addr
->addresses
[sock
->addr
->curraddr
]);
569 a
.sin_port
= htons((short) sock
->port
);
570 sa
= (const struct sockaddr
*)&a
;
575 assert(sock
->port
== 0); /* to catch confused people */
576 assert(strlen(sock
->addr
->hostname
) < sizeof au
.sun_path
);
577 memset(&au
, 0, sizeof au
);
578 au
.sun_family
= AF_UNIX
;
579 strcpy(au
.sun_path
, sock
->addr
->hostname
);
580 sa
= (const struct sockaddr
*)&au
;
585 assert(0 && "unknown address family");
586 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
589 fl
= fcntl(s
, F_GETFL
);
591 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
593 if ((connect(s
, sa
, salen
)) < 0) {
594 if ( errno
!= EINPROGRESS
) {
600 * If we _don't_ get EWOULDBLOCK, the connect has completed
601 * and we should set the socket as connected and writable.
608 add234(sktree
, sock
);
612 plug_log(sock
->plug
, 1, sock
->addr
, sock
->port
, strerror(err
), err
);
616 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
617 int nodelay
, int keepalive
, Plug plug
)
623 * Create Socket structure.
625 ret
= snew(struct Socket_tag
);
626 ret
->fn
= &tcp_fn_table
;
629 bufchain_init(&ret
->output_data
);
630 ret
->connected
= 0; /* to start with */
631 ret
->writable
= 0; /* to start with */
632 ret
->sending_oob
= 0;
634 ret
->frozen_readable
= 0;
635 ret
->localhost_only
= 0; /* unused, but best init anyway */
636 ret
->pending_error
= 0;
637 ret
->oobpending
= FALSE
;
641 ret
->oobinline
= oobinline
;
642 ret
->nodelay
= nodelay
;
643 ret
->keepalive
= keepalive
;
644 ret
->privport
= privport
;
649 err
= try_connect(ret
);
650 } while (err
&& sk_nextaddr(ret
->addr
));
653 ret
->error
= strerror(err
);
658 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int address_family
)
662 struct addrinfo hints
, *ai
;
664 struct sockaddr_in6 a6
;
666 struct sockaddr
*addr
;
668 struct sockaddr_in a
;
674 * Create Socket structure.
676 ret
= snew(struct Socket_tag
);
677 ret
->fn
= &tcp_fn_table
;
680 bufchain_init(&ret
->output_data
);
681 ret
->writable
= 0; /* to start with */
682 ret
->sending_oob
= 0;
684 ret
->frozen_readable
= 0;
685 ret
->localhost_only
= local_host_only
;
686 ret
->pending_error
= 0;
687 ret
->oobpending
= FALSE
;
692 * Translate address_family from platform-independent constants
693 * into local reality.
695 address_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
697 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
702 /* Let's default to IPv6.
703 * If the stack doesn't support IPv6, we will fall back to IPv4. */
704 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
706 /* No other choice, default to IPv4 */
707 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
713 s
= socket(address_family
, SOCK_STREAM
, 0);
716 /* If the host doesn't support IPv6 try fallback to IPv4. */
717 if (s
< 0 && address_family
== AF_INET6
) {
718 address_family
= AF_INET
;
719 s
= socket(address_family
, SOCK_STREAM
, 0);
724 ret
->error
= strerror(errno
);
732 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
735 addr
= NULL
; addrlen
= -1; /* placate optimiser */
737 if (srcaddr
!= NULL
) {
739 hints
.ai_flags
= AI_NUMERICHOST
;
740 hints
.ai_family
= address_family
;
741 hints
.ai_socktype
= SOCK_STREAM
;
742 hints
.ai_protocol
= 0;
743 hints
.ai_addrlen
= 0;
744 hints
.ai_addr
= NULL
;
745 hints
.ai_canonname
= NULL
;
746 hints
.ai_next
= NULL
;
747 assert(port
>= 0 && port
<= 99999);
748 sprintf(portstr
, "%d", port
);
749 retcode
= getaddrinfo(srcaddr
, portstr
, &hints
, &ai
);
752 addrlen
= ai
->ai_addrlen
;
755 memset(&a
,'\0',sizeof(struct sockaddr_in
));
756 a
.sin_family
= AF_INET
;
757 a
.sin_port
= htons(port
);
758 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
759 if (a
.sin_addr
.s_addr
!= (in_addr_t
)(-1)) {
760 /* Override localhost_only with specified listen addr. */
761 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
763 addr
= (struct sockaddr
*)&a
;
771 if (address_family
== AF_INET6
) {
772 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
773 a6
.sin6_family
= AF_INET6
;
774 a6
.sin6_port
= htons(port
);
776 a6
.sin6_addr
= in6addr_loopback
;
778 a6
.sin6_addr
= in6addr_any
;
779 addr
= (struct sockaddr
*)&a6
;
780 addrlen
= sizeof(a6
);
784 memset(&a
,'\0',sizeof(struct sockaddr_in
));
785 a
.sin_family
= AF_INET
;
786 a
.sin_port
= htons(port
);
788 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
790 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
791 addr
= (struct sockaddr
*)&a
;
796 retcode
= bind(s
, addr
, addrlen
);
799 ret
->error
= strerror(errno
);
803 if (listen(s
, SOMAXCONN
) < 0) {
805 ret
->error
= strerror(errno
);
817 static void sk_tcp_close(Socket sock
)
819 Actual_Socket s
= (Actual_Socket
) sock
;
825 sk_addr_free(s
->addr
);
829 void *sk_getxdmdata(void *sock
, int *lenp
)
831 Actual_Socket s
= (Actual_Socket
) sock
;
833 struct sockaddr_in addr
;
835 struct sockaddr_storage addr
;
836 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)&addr
;
838 struct sockaddr
*sa
= (struct sockaddr
*)&addr
;
839 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&addr
;
842 static unsigned int unix_addr
= 0xFFFFFFFF;
845 * We must check that this socket really _is_ an Actual_Socket.
847 if (s
->fn
!= &tcp_fn_table
)
848 return NULL
; /* failure */
850 addrlen
= sizeof(addr
);
851 if (getsockname(s
->s
, sa
, &addrlen
) < 0)
853 switch(sa
->sa_family
) {
856 buf
= snewn(*lenp
, char);
857 PUT_32BIT_MSB_FIRST(buf
, ntohl(sin
->sin_addr
.s_addr
));
858 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin
->sin_port
));
863 buf
= snewn(*lenp
, char);
864 if (IN6_IS_ADDR_V4MAPPED(&sin6
->sin6_addr
)) {
865 memcpy(buf
, sin6
->sin6_addr
.s6_addr
+ 12, 4);
866 PUT_16BIT_MSB_FIRST(buf
+4, ntohs(sin6
->sin6_port
));
868 /* This is stupid, but it's what XLib does. */
874 buf
= snewn(*lenp
, char);
875 PUT_32BIT_MSB_FIRST(buf
, unix_addr
--);
876 PUT_16BIT_MSB_FIRST(buf
+4, getpid());
889 * The function which tries to send on a socket once it's deemed
892 void try_send(Actual_Socket s
)
894 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
900 if (s
->sending_oob
) {
901 urgentflag
= MSG_OOB
;
902 len
= s
->sending_oob
;
906 bufchain_prefix(&s
->output_data
, &data
, &len
);
908 nsent
= send(s
->s
, data
, len
, urgentflag
);
909 noise_ultralight(nsent
);
911 err
= (nsent
< 0 ? errno
: 0);
912 if (err
== EWOULDBLOCK
) {
914 * Perfectly normal: we've sent all we can for the moment.
920 * We unfortunately can't just call plug_closing(),
921 * because it's quite likely that we're currently
922 * _in_ a call from the code we'd be calling back
923 * to, so we'd have to make half the SSH code
924 * reentrant. Instead we flag a pending error on
925 * the socket, to be dealt with (by calling
926 * plug_closing()) at some suitable future moment.
928 s
->pending_error
= err
;
932 if (s
->sending_oob
) {
934 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
935 s
->sending_oob
= len
- nsent
;
940 bufchain_consume(&s
->output_data
, nsent
);
947 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
949 Actual_Socket s
= (Actual_Socket
) sock
;
952 * Add the data to the buffer list on the socket.
954 bufchain_add(&s
->output_data
, buf
, len
);
957 * Now try sending from the start of the buffer list.
963 * Update the select() status to correctly reflect whether or
964 * not we should be selecting for write.
968 return bufchain_size(&s
->output_data
);
971 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
973 Actual_Socket s
= (Actual_Socket
) sock
;
976 * Replace the buffer list on the socket with the data.
978 bufchain_clear(&s
->output_data
);
979 assert(len
<= sizeof(s
->oobdata
));
980 memcpy(s
->oobdata
, buf
, len
);
981 s
->sending_oob
= len
;
984 * Now try sending from the start of the buffer list.
990 * Update the select() status to correctly reflect whether or
991 * not we should be selecting for write.
995 return s
->sending_oob
;
998 static int net_select_result(int fd
, int event
)
1001 char buf
[20480]; /* nice big buffer for plenty of speed */
1005 /* Find the Socket structure */
1006 s
= find234(sktree
, &fd
, cmpforsearch
);
1008 return 1; /* boggle */
1010 noise_ultralight(event
);
1013 case 4: /* exceptional */
1014 if (!s
->oobinline
) {
1016 * On a non-oobinline socket, this indicates that we
1017 * can immediately perform an OOB read and get back OOB
1018 * data, which we will send to the back end with
1019 * type==2 (urgent data).
1021 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1022 noise_ultralight(ret
);
1024 return plug_closing(s
->plug
,
1025 ret
== 0 ?
"Internal networking trouble" :
1026 strerror(errno
), errno
, 0);
1029 * Receiving actual data on a socket means we can
1030 * stop falling back through the candidate
1031 * addresses to connect to.
1034 sk_addr_free(s
->addr
);
1037 return plug_receive(s
->plug
, 2, buf
, ret
);
1043 * If we reach here, this is an oobinline socket, which
1044 * means we should set s->oobpending and then deal with it
1045 * when we get called for the readability event (which
1046 * should also occur).
1048 s
->oobpending
= TRUE
;
1050 case 1: /* readable; also acceptance */
1053 * On a listening socket, the readability event means a
1054 * connection is ready to be accepted.
1057 struct sockaddr_in ss
;
1059 struct sockaddr_storage ss
;
1061 socklen_t addrlen
= sizeof(ss
);
1062 int t
; /* socket of connection */
1064 memset(&ss
, 0, addrlen
);
1065 t
= accept(s
->s
, (struct sockaddr
*)&ss
, &addrlen
);
1070 if (s
->localhost_only
&&
1071 !sockaddr_is_loopback((struct sockaddr
*)&ss
)) {
1072 close(t
); /* someone let nonlocal through?! */
1073 } else if (plug_accepting(s
->plug
, t
)) {
1074 close(t
); /* denied or error */
1080 * If we reach here, this is not a listening socket, so
1081 * readability really means readability.
1084 /* In the case the socket is still frozen, we don't even bother */
1086 s
->frozen_readable
= 1;
1091 * We have received data on the socket. For an oobinline
1092 * socket, this might be data _before_ an urgent pointer,
1093 * in which case we send it to the back end with type==1
1094 * (data prior to urgent).
1096 if (s
->oobinline
&& s
->oobpending
) {
1098 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
1099 s
->oobpending
= FALSE
; /* clear this indicator */
1103 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
1104 noise_ultralight(ret
);
1106 if (errno
== EWOULDBLOCK
) {
1112 * An error at this point _might_ be an error reported
1113 * by a non-blocking connect(). So before we return a
1114 * panic status to the user, let's just see whether
1119 plug_log(s
->plug
, 1, s
->addr
, s
->port
, strerror(err
), err
);
1120 while (s
->addr
&& sk_nextaddr(s
->addr
)) {
1121 err
= try_connect(s
);
1125 return plug_closing(s
->plug
, strerror(err
), err
, 0);
1126 } else if (0 == ret
) {
1127 return plug_closing(s
->plug
, NULL
, 0, 0);
1130 * Receiving actual data on a socket means we can
1131 * stop falling back through the candidate
1132 * addresses to connect to.
1135 sk_addr_free(s
->addr
);
1138 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1141 case 2: /* writable */
1142 if (!s
->connected
) {
1144 * select() reports a socket as _writable_ when an
1145 * asynchronous connection is completed.
1147 s
->connected
= s
->writable
= 1;
1151 int bufsize_before
, bufsize_after
;
1153 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1155 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1156 if (bufsize_after
< bufsize_before
)
1157 plug_sent(s
->plug
, bufsize_after
);
1166 * Deal with socket errors detected in try_send().
1168 void net_pending_errors(void)
1174 * This might be a fiddly business, because it's just possible
1175 * that handling a pending error on one socket might cause
1176 * others to be closed. (I can't think of any reason this might
1177 * happen in current SSH implementation, but to maintain
1178 * generality of this network layer I'll assume the worst.)
1180 * So what we'll do is search the socket list for _one_ socket
1181 * with a pending error, and then handle it, and then search
1182 * the list again _from the beginning_. Repeat until we make a
1183 * pass with no socket errors present. That way we are
1184 * protected against the socket list changing under our feet.
1188 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1189 if (s
->pending_error
) {
1191 * An error has occurred on this socket. Pass it to the
1194 plug_closing(s
->plug
, strerror(s
->pending_error
),
1195 s
->pending_error
, 0);
1203 * Each socket abstraction contains a `void *' private field in
1204 * which the client can keep state.
1206 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1208 Actual_Socket s
= (Actual_Socket
) sock
;
1209 s
->private_ptr
= ptr
;
1212 static void *sk_tcp_get_private_ptr(Socket sock
)
1214 Actual_Socket s
= (Actual_Socket
) sock
;
1215 return s
->private_ptr
;
1219 * Special error values are returned from sk_namelookup and sk_new
1220 * if there's a problem. These functions extract an error message,
1221 * or return NULL if there's no problem.
1223 const char *sk_addr_error(SockAddr addr
)
1227 static const char *sk_tcp_socket_error(Socket sock
)
1229 Actual_Socket s
= (Actual_Socket
) sock
;
1233 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1235 Actual_Socket s
= (Actual_Socket
) sock
;
1236 if (s
->frozen
== is_frozen
)
1238 s
->frozen
= is_frozen
;
1239 if (!is_frozen
&& s
->frozen_readable
) {
1241 recv(s
->s
, &c
, 1, MSG_PEEK
);
1243 s
->frozen_readable
= 0;
1247 static void uxsel_tell(Actual_Socket s
)
1251 rwx
|= 1; /* read == accept */
1254 rwx
|= 2; /* write == connect */
1255 if (s
->connected
&& !s
->frozen
)
1256 rwx
|= 1 | 4; /* read, except */
1257 if (bufchain_size(&s
->output_data
))
1258 rwx
|= 2; /* write */
1260 uxsel_set(s
->s
, rwx
, net_select_result
);
1263 int net_service_lookup(char *service
)
1266 se
= getservbyname(service
, NULL
);
1268 return ntohs(se
->s_port
);
1273 SockAddr
platform_get_x11_unix_address(int displaynum
, char **canonicalname
)
1275 SockAddr ret
= snew(struct SockAddr_tag
);
1278 memset(ret
, 0, sizeof *ret
);
1279 ret
->family
= AF_UNIX
;
1280 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1281 "%s%d", X11_UNIX_PATH
, displaynum
);
1283 ret
->error
= "snprintf failed";
1284 else if(n
>= sizeof ret
->hostname
)
1285 ret
->error
= "X11 UNIX name too long";
1287 *canonicalname
= dupstr(ret
->hostname
);
1289 ret
->ai
= ret
->ais
= NULL
;
1291 ret
->addresses
= NULL
;
1292 ret
->curraddr
= ret
->naddresses
= 0;