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 */
51 int nodelay
, keepalive
; /* for connect()-type sockets */
52 int privport
, port
; /* and again */
57 * We used to typedef struct Socket_tag *Socket.
59 * Since we have made the networking abstraction slightly more
60 * abstract, Socket no longer means a tcp socket (it could mean
61 * an ssl socket). So now we must use Actual_Socket when we know
62 * we are talking about a tcp socket.
64 typedef struct Socket_tag
*Actual_Socket
;
69 * Which address family this address belongs to. AF_INET for
70 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
71 * resolution has not been done and a simple host name is held
72 * in this SockAddr structure.
76 struct addrinfo
*ais
; /* Addresses IPv6 style. */
77 struct addrinfo
*ai
; /* steps along the linked list */
79 unsigned long *addresses
; /* Addresses IPv4 style. */
80 int naddresses
, curraddr
;
82 char hostname
[512]; /* Store an unresolved host name. */
85 static tree234
*sktree
;
87 static void uxsel_tell(Actual_Socket s
);
89 static int cmpfortree(void *av
, void *bv
)
91 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
92 int as
= a
->s
, bs
= b
->s
;
100 static int cmpforsearch(void *av
, void *bv
)
102 Actual_Socket b
= (Actual_Socket
) bv
;
103 int as
= *(int *)av
, bs
= b
->s
;
113 sktree
= newtree234(cmpfortree
);
116 void sk_cleanup(void)
122 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
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
;
141 /* Clear the structure and default to IPv4. */
142 memset(ret
, 0, sizeof(struct SockAddr_tag
));
143 ret
->family
= 0; /* We set this one when we have resolved the host. */
148 hints
.ai_flags
= AI_CANONNAME
;
149 hints
.ai_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
150 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
152 hints
.ai_socktype
= SOCK_STREAM
;
153 hints
.ai_protocol
= 0;
154 hints
.ai_addrlen
= 0;
155 hints
.ai_addr
= NULL
;
156 hints
.ai_canonname
= NULL
;
157 hints
.ai_next
= NULL
;
158 err
= getaddrinfo(host
, NULL
, &hints
, &ret
->ais
);
161 ret
->error
= gai_strerror(err
);
164 ret
->family
= ret
->ai
->ai_family
;
166 if (ret
->ai
->ai_canonname
!= NULL
)
167 strncat(realhost
, ret
->ai
->ai_canonname
, sizeof(realhost
) - 1);
169 strncat(realhost
, host
, sizeof(realhost
) - 1);
171 if ((a
= inet_addr(host
)) == (unsigned long)(in_addr_t
)(-1)) {
173 * Otherwise use the IPv4-only gethostbyname... (NOTE:
174 * we don't use gethostbyname as a fallback!)
176 if (ret
->family
== 0) {
177 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
178 if ( (h
= gethostbyname(host
)) )
179 ret
->family
= AF_INET
;
181 if (ret
->family
== 0) {
182 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
183 h_errno
== NO_DATA
||
184 h_errno
== NO_ADDRESS ?
"Host does not exist" :
185 h_errno
== TRY_AGAIN ?
186 "Temporary name service failure" :
187 "gethostbyname: unknown error");
190 /* This way we are always sure the h->h_name is valid :) */
191 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
192 for (n
= 0; h
->h_addr_list
[n
]; n
++);
193 ret
->addresses
= snewn(n
, unsigned long);
195 for (n
= 0; n
< ret
->naddresses
; n
++) {
196 memcpy(&a
, h
->h_addr_list
[n
], sizeof(a
));
197 ret
->addresses
[n
] = ntohl(a
);
201 * This must be a numeric IPv4 address because it caused a
202 * success return from inet_addr.
204 ret
->family
= AF_INET
;
205 strncpy(realhost
, host
, sizeof(realhost
));
206 ret
->addresses
= snew(unsigned long);
208 ret
->addresses
[0] = ntohl(a
);
212 realhost
[lenof(realhost
)-1] = '\0';
213 *canonicalname
= snewn(1+strlen(realhost
), char);
214 strcpy(*canonicalname
, realhost
);
218 SockAddr
sk_nonamelookup(const char *host
)
220 SockAddr ret
= snew(struct SockAddr_tag
);
222 ret
->family
= AF_UNSPEC
;
223 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
224 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
228 ret
->addresses
= NULL
;
233 static int sk_nextaddr(SockAddr addr
)
236 if (addr
->ai
->ai_next
) {
237 addr
->ai
= addr
->ai
->ai_next
;
238 addr
->family
= addr
->ai
->ai_family
;
243 if (addr
->curraddr
+1 < addr
->naddresses
) {
252 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
255 if (addr
->family
== AF_UNSPEC
) {
256 strncpy(buf
, addr
->hostname
, buflen
);
257 buf
[buflen
-1] = '\0';
260 if (getnameinfo(addr
->ai
->ai_addr
, addr
->ai
->ai_addrlen
, buf
, buflen
,
261 NULL
, 0, NI_NUMERICHOST
) != 0) {
263 strncat(buf
, "<unknown>", buflen
- 1);
267 assert(addr
->family
== AF_INET
);
268 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
269 strncpy(buf
, inet_ntoa(a
), buflen
);
270 buf
[buflen
-1] = '\0';
275 int sk_hostname_is_local(char *name
)
277 return !strcmp(name
, "localhost");
280 int sk_address_is_local(SockAddr addr
)
283 if (addr
->family
== AF_UNSPEC
)
284 return 0; /* we don't know; assume not */
287 if (addr
->family
== AF_INET
)
288 return ipv4_is_loopback(
289 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
);
290 else if (addr
->family
== AF_INET6
)
291 return IN6_IS_ADDR_LOOPBACK(
292 &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
);
297 assert(addr
->family
== AF_INET
);
298 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
299 return ipv4_is_loopback(a
);
304 int sk_addrtype(SockAddr addr
)
306 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
:
308 addr
->family
== AF_INET6 ? ADDRTYPE_IPV6
:
313 void sk_addrcopy(SockAddr addr
, char *buf
)
317 if (addr
->family
== AF_INET
)
318 memcpy(buf
, &((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
,
319 sizeof(struct in_addr
));
320 else if (addr
->family
== AF_INET6
)
321 memcpy(buf
, &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
,
322 sizeof(struct in6_addr
));
328 assert(addr
->family
== AF_INET
);
329 a
.s_addr
= htonl(addr
->addresses
[addr
->curraddr
]);
330 memcpy(buf
, (char*) &a
.s_addr
, 4);
334 void sk_addr_free(SockAddr addr
)
338 if (addr
->ais
!= NULL
)
339 freeaddrinfo(addr
->ais
);
341 sfree(addr
->addresses
);
346 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
348 Actual_Socket s
= (Actual_Socket
) sock
;
355 static void sk_tcp_flush(Socket s
)
358 * We send data to the socket as soon as we can anyway,
359 * so we don't need to do anything here. :-)
363 static void sk_tcp_close(Socket s
);
364 static int sk_tcp_write(Socket s
, const char *data
, int len
);
365 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
366 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
367 static void *sk_tcp_get_private_ptr(Socket s
);
368 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
369 static const char *sk_tcp_socket_error(Socket s
);
371 static struct socket_function_table tcp_fn_table
= {
377 sk_tcp_set_private_ptr
,
378 sk_tcp_get_private_ptr
,
383 Socket
sk_register(OSSocket sockfd
, Plug plug
)
388 * Create Socket structure.
390 ret
= snew(struct Socket_tag
);
391 ret
->fn
= &tcp_fn_table
;
394 bufchain_init(&ret
->output_data
);
395 ret
->writable
= 1; /* to start with */
396 ret
->sending_oob
= 0;
398 ret
->frozen_readable
= 0;
399 ret
->localhost_only
= 0; /* unused, but best init anyway */
400 ret
->pending_error
= 0;
401 ret
->oobpending
= FALSE
;
408 ret
->error
= strerror(errno
);
420 static int try_connect(Actual_Socket sock
)
424 struct sockaddr_in6 a6
;
426 struct sockaddr_in a
;
427 struct sockaddr_un au
;
428 const struct sockaddr
*sa
;
436 plug_log(sock
->plug
, 0, sock
->addr
, sock
->port
, NULL
, 0);
441 assert(sock
->addr
->family
!= AF_UNSPEC
);
442 s
= socket(sock
->addr
->family
, SOCK_STREAM
, 0);
450 if (sock
->oobinline
) {
452 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
457 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
460 if (sock
->keepalive
) {
462 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
466 * Bind to local address.
469 localport
= 1023; /* count from 1023 downwards */
471 localport
= 0; /* just use port 0 (ie kernel picks) */
473 /* BSD IP stacks need sockaddr_in zeroed before filling in */
474 memset(&a
,'\0',sizeof(struct sockaddr_in
));
476 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
479 /* We don't try to bind to a local address for UNIX domain sockets. (Why
480 * do we bother doing the bind when localport == 0 anyway?) */
481 if(sock
->addr
->family
!= AF_UNIX
) {
482 /* Loop round trying to bind */
487 if (sock
->addr
->family
== AF_INET6
) {
488 /* XXX use getaddrinfo to get a local address? */
489 a6
.sin6_family
= AF_INET6
;
490 a6
.sin6_addr
= in6addr_any
;
491 a6
.sin6_port
= htons(localport
);
492 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
496 assert(sock
->addr
->family
== AF_INET
);
497 a
.sin_family
= AF_INET
;
498 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
499 a
.sin_port
= htons(localport
);
500 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
507 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
512 break; /* we're only looping once */
515 break; /* we might have got to the end */
523 * Connect to remote address.
525 switch(sock
->addr
->family
) {
528 /* XXX would be better to have got getaddrinfo() to fill in the port. */
529 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
531 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
532 salen
= sock
->addr
->ai
->ai_addrlen
;
535 ((struct sockaddr_in
*)sock
->addr
->ai
->ai_addr
)->sin_port
=
537 sa
= (const struct sockaddr
*)sock
->addr
->ai
->ai_addr
;
538 salen
= sock
->addr
->ai
->ai_addrlen
;
542 a
.sin_family
= AF_INET
;
543 a
.sin_addr
.s_addr
= htonl(sock
->addr
->addresses
[sock
->addr
->curraddr
]);
544 a
.sin_port
= htons((short) sock
->port
);
545 sa
= (const struct sockaddr
*)&a
;
550 assert(sock
->port
== 0); /* to catch confused people */
551 assert(strlen(sock
->addr
->hostname
) < sizeof au
.sun_path
);
552 memset(&au
, 0, sizeof au
);
553 au
.sun_family
= AF_UNIX
;
554 strcpy(au
.sun_path
, sock
->addr
->hostname
);
555 sa
= (const struct sockaddr
*)&au
;
560 assert(0 && "unknown address family");
563 fl
= fcntl(s
, F_GETFL
);
565 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
567 if ((connect(s
, sa
, salen
)) < 0) {
568 if ( errno
!= EINPROGRESS
) {
574 * If we _don't_ get EWOULDBLOCK, the connect has completed
575 * and we should set the socket as connected and writable.
582 add234(sktree
, sock
);
586 plug_log(sock
->plug
, 1, sock
->addr
, sock
->port
, strerror(err
), err
);
590 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
591 int nodelay
, int keepalive
, Plug plug
)
597 * Create Socket structure.
599 ret
= snew(struct Socket_tag
);
600 ret
->fn
= &tcp_fn_table
;
603 bufchain_init(&ret
->output_data
);
604 ret
->connected
= 0; /* to start with */
605 ret
->writable
= 0; /* to start with */
606 ret
->sending_oob
= 0;
608 ret
->frozen_readable
= 0;
609 ret
->localhost_only
= 0; /* unused, but best init anyway */
610 ret
->pending_error
= 0;
611 ret
->oobpending
= FALSE
;
615 ret
->oobinline
= oobinline
;
616 ret
->nodelay
= nodelay
;
617 ret
->keepalive
= keepalive
;
618 ret
->privport
= privport
;
623 err
= try_connect(ret
);
624 } while (err
&& sk_nextaddr(ret
->addr
));
627 ret
->error
= strerror(err
);
632 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int address_family
)
636 struct addrinfo hints
, *ai
;
638 struct sockaddr_in6 a6
;
640 struct sockaddr
*addr
;
642 struct sockaddr_in a
;
648 * Create Socket structure.
650 ret
= snew(struct Socket_tag
);
651 ret
->fn
= &tcp_fn_table
;
654 bufchain_init(&ret
->output_data
);
655 ret
->writable
= 0; /* to start with */
656 ret
->sending_oob
= 0;
658 ret
->frozen_readable
= 0;
659 ret
->localhost_only
= local_host_only
;
660 ret
->pending_error
= 0;
661 ret
->oobpending
= FALSE
;
666 * Translate address_family from platform-independent constants
667 * into local reality.
669 address_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
670 address_family
== ADDRTYPE_IPV6 ? AF_INET6
: AF_UNSPEC
);
673 /* Let's default to IPv6.
674 * If the stack doesn't support IPv6, we will fall back to IPv4. */
675 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
677 /* No other choice, default to IPv4 */
678 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
684 s
= socket(address_family
, SOCK_STREAM
, 0);
686 /* If the host doesn't support IPv6 try fallback to IPv4. */
687 if (s
< 0 && address_family
== AF_INET6
) {
688 address_family
= AF_INET
;
689 s
= socket(address_family
, SOCK_STREAM
, 0);
693 ret
->error
= strerror(errno
);
699 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
702 addr
= NULL
; addrlen
= -1; /* placate optimiser */
704 if (srcaddr
!= NULL
) {
706 hints
.ai_flags
= AI_NUMERICHOST
;
707 hints
.ai_family
= address_family
;
708 hints
.ai_socktype
= SOCK_STREAM
;
709 hints
.ai_protocol
= 0;
710 hints
.ai_addrlen
= 0;
711 hints
.ai_addr
= NULL
;
712 hints
.ai_canonname
= NULL
;
713 hints
.ai_next
= NULL
;
714 sprintf(portstr
, "%d", port
);
715 retcode
= getaddrinfo(srcaddr
, portstr
, &hints
, &ai
);
718 addrlen
= ai
->ai_addrlen
;
721 memset(&a
,'\0',sizeof(struct sockaddr_in
));
722 a
.sin_family
= AF_INET
;
723 a
.sin_port
= htons(port
);
724 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
725 if (a
.sin_addr
.s_addr
!= (in_addr_t
)(-1)) {
726 /* Override localhost_only with specified listen addr. */
727 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
730 addr
= (struct sockaddr
*)a
;
738 if (address_family
== AF_INET6
) {
739 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
740 a6
.sin6_family
= AF_INET6
;
741 a6
.sin6_port
= htons(port
);
743 a6
.sin6_addr
= in6addr_loopback
;
745 a6
.sin6_addr
= in6addr_any
;
746 addr
= (struct sockaddr
*)&a6
;
747 addrlen
= sizeof(a6
);
751 memset(&a
,'\0',sizeof(struct sockaddr_in
));
752 a
.sin_family
= AF_INET
;
753 a
.sin_port
= htons(port
);
755 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
757 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
758 addr
= (struct sockaddr
*)&a
;
763 retcode
= bind(s
, addr
, addrlen
);
766 ret
->error
= strerror(errno
);
770 if (listen(s
, SOMAXCONN
) < 0) {
772 ret
->error
= strerror(errno
);
784 static void sk_tcp_close(Socket sock
)
786 Actual_Socket s
= (Actual_Socket
) sock
;
792 sk_addr_free(s
->addr
);
796 int sk_getxdmdata(void *sock
, unsigned long *ip
, int *port
)
798 Actual_Socket s
= (Actual_Socket
) sock
;
799 struct sockaddr_in addr
;
803 * We must check that this socket really _is_ an Actual_Socket.
805 if (s
->fn
!= &tcp_fn_table
)
806 return 0; /* failure */
808 addrlen
= sizeof(addr
);
809 if (getsockname(s
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
811 switch(addr
.sin_family
) {
813 *ip
= ntohl(addr
.sin_addr
.s_addr
);
814 *port
= ntohs(addr
.sin_port
);
818 * For a Unix socket, we return 0xFFFFFFFF for the IP address and
819 * our current pid for the port. Bizarre, but such is life.
821 *ip
= ntohl(0xFFFFFFFF);
835 * The function which tries to send on a socket once it's deemed
838 void try_send(Actual_Socket s
)
840 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
846 if (s
->sending_oob
) {
847 urgentflag
= MSG_OOB
;
848 len
= s
->sending_oob
;
852 bufchain_prefix(&s
->output_data
, &data
, &len
);
854 nsent
= send(s
->s
, data
, len
, urgentflag
);
855 noise_ultralight(nsent
);
857 err
= (nsent
< 0 ? errno
: 0);
858 if (err
== EWOULDBLOCK
) {
860 * Perfectly normal: we've sent all we can for the moment.
864 } else if (nsent
== 0 ||
865 err
== ECONNABORTED
|| err
== ECONNRESET
) {
867 * If send() returns CONNABORTED or CONNRESET, we
868 * unfortunately can't just call plug_closing(),
869 * because it's quite likely that we're currently
870 * _in_ a call from the code we'd be calling back
871 * to, so we'd have to make half the SSH code
872 * reentrant. Instead we flag a pending error on
873 * the socket, to be dealt with (by calling
874 * plug_closing()) at some suitable future moment.
876 s
->pending_error
= err
;
879 /* We're inside the Unix frontend here, so we know
880 * that the frontend handle is unnecessary. */
881 logevent(NULL
, strerror(err
));
882 fatalbox("%s", strerror(err
));
885 if (s
->sending_oob
) {
887 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
888 s
->sending_oob
= len
- nsent
;
893 bufchain_consume(&s
->output_data
, nsent
);
900 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
902 Actual_Socket s
= (Actual_Socket
) sock
;
905 * Add the data to the buffer list on the socket.
907 bufchain_add(&s
->output_data
, buf
, len
);
910 * Now try sending from the start of the buffer list.
916 * Update the select() status to correctly reflect whether or
917 * not we should be selecting for write.
921 return bufchain_size(&s
->output_data
);
924 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
926 Actual_Socket s
= (Actual_Socket
) sock
;
929 * Replace the buffer list on the socket with the data.
931 bufchain_clear(&s
->output_data
);
932 assert(len
<= sizeof(s
->oobdata
));
933 memcpy(s
->oobdata
, buf
, len
);
934 s
->sending_oob
= len
;
937 * Now try sending from the start of the buffer list.
943 * Update the select() status to correctly reflect whether or
944 * not we should be selecting for write.
948 return s
->sending_oob
;
951 static int net_select_result(int fd
, int event
)
954 char buf
[20480]; /* nice big buffer for plenty of speed */
958 /* Find the Socket structure */
959 s
= find234(sktree
, &fd
, cmpforsearch
);
961 return 1; /* boggle */
963 noise_ultralight(event
);
966 case 4: /* exceptional */
969 * On a non-oobinline socket, this indicates that we
970 * can immediately perform an OOB read and get back OOB
971 * data, which we will send to the back end with
972 * type==2 (urgent data).
974 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
975 noise_ultralight(ret
);
977 const char *str
= (ret
== 0 ?
"Internal networking trouble" :
979 /* We're inside the Unix frontend here, so we know
980 * that the frontend handle is unnecessary. */
985 * Receiving actual data on a socket means we can
986 * stop falling back through the candidate
987 * addresses to connect to.
990 sk_addr_free(s
->addr
);
993 return plug_receive(s
->plug
, 2, buf
, ret
);
999 * If we reach here, this is an oobinline socket, which
1000 * means we should set s->oobpending and then deal with it
1001 * when we get called for the readability event (which
1002 * should also occur).
1004 s
->oobpending
= TRUE
;
1006 case 1: /* readable; also acceptance */
1009 * On a listening socket, the readability event means a
1010 * connection is ready to be accepted.
1012 struct sockaddr_in isa
;
1013 int addrlen
= sizeof(struct sockaddr_in
);
1014 int t
; /* socket of connection */
1016 memset(&isa
, 0, sizeof(struct sockaddr_in
));
1017 t
= accept(s
->s
,(struct sockaddr
*)&isa
,(socklen_t
*) &addrlen
);
1022 if (s
->localhost_only
&& !ipv4_is_loopback(isa
.sin_addr
)) {
1023 close(t
); /* someone let nonlocal through?! */
1024 } else if (plug_accepting(s
->plug
, t
)) {
1025 close(t
); /* denied or error */
1031 * If we reach here, this is not a listening socket, so
1032 * readability really means readability.
1035 /* In the case the socket is still frozen, we don't even bother */
1037 s
->frozen_readable
= 1;
1042 * We have received data on the socket. For an oobinline
1043 * socket, this might be data _before_ an urgent pointer,
1044 * in which case we send it to the back end with type==1
1045 * (data prior to urgent).
1047 if (s
->oobinline
&& s
->oobpending
) {
1049 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
1050 s
->oobpending
= FALSE
; /* clear this indicator */
1054 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
1055 noise_ultralight(ret
);
1057 if (errno
== EWOULDBLOCK
) {
1063 * An error at this point _might_ be an error reported
1064 * by a non-blocking connect(). So before we return a
1065 * panic status to the user, let's just see whether
1070 plug_log(s
->plug
, 1, s
->addr
, s
->port
, strerror(err
), err
);
1071 while (s
->addr
&& sk_nextaddr(s
->addr
)) {
1072 err
= try_connect(s
);
1076 return plug_closing(s
->plug
, strerror(err
), err
, 0);
1077 } else if (0 == ret
) {
1078 return plug_closing(s
->plug
, NULL
, 0, 0);
1081 * Receiving actual data on a socket means we can
1082 * stop falling back through the candidate
1083 * addresses to connect to.
1086 sk_addr_free(s
->addr
);
1089 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1092 case 2: /* writable */
1093 if (!s
->connected
) {
1095 * select() reports a socket as _writable_ when an
1096 * asynchronous connection is completed.
1098 s
->connected
= s
->writable
= 1;
1102 int bufsize_before
, bufsize_after
;
1104 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1106 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1107 if (bufsize_after
< bufsize_before
)
1108 plug_sent(s
->plug
, bufsize_after
);
1117 * Deal with socket errors detected in try_send().
1119 void net_pending_errors(void)
1125 * This might be a fiddly business, because it's just possible
1126 * that handling a pending error on one socket might cause
1127 * others to be closed. (I can't think of any reason this might
1128 * happen in current SSH implementation, but to maintain
1129 * generality of this network layer I'll assume the worst.)
1131 * So what we'll do is search the socket list for _one_ socket
1132 * with a pending error, and then handle it, and then search
1133 * the list again _from the beginning_. Repeat until we make a
1134 * pass with no socket errors present. That way we are
1135 * protected against the socket list changing under our feet.
1139 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1140 if (s
->pending_error
) {
1142 * An error has occurred on this socket. Pass it to the
1145 plug_closing(s
->plug
, strerror(s
->pending_error
),
1146 s
->pending_error
, 0);
1154 * Each socket abstraction contains a `void *' private field in
1155 * which the client can keep state.
1157 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1159 Actual_Socket s
= (Actual_Socket
) sock
;
1160 s
->private_ptr
= ptr
;
1163 static void *sk_tcp_get_private_ptr(Socket sock
)
1165 Actual_Socket s
= (Actual_Socket
) sock
;
1166 return s
->private_ptr
;
1170 * Special error values are returned from sk_namelookup and sk_new
1171 * if there's a problem. These functions extract an error message,
1172 * or return NULL if there's no problem.
1174 const char *sk_addr_error(SockAddr addr
)
1178 static const char *sk_tcp_socket_error(Socket sock
)
1180 Actual_Socket s
= (Actual_Socket
) sock
;
1184 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1186 Actual_Socket s
= (Actual_Socket
) sock
;
1187 if (s
->frozen
== is_frozen
)
1189 s
->frozen
= is_frozen
;
1190 if (!is_frozen
&& s
->frozen_readable
) {
1192 recv(s
->s
, &c
, 1, MSG_PEEK
);
1194 s
->frozen_readable
= 0;
1198 static void uxsel_tell(Actual_Socket s
)
1202 rwx
|= 2; /* write == connect */
1203 if (s
->connected
&& !s
->frozen
)
1204 rwx
|= 1 | 4; /* read, except */
1205 if (bufchain_size(&s
->output_data
))
1206 rwx
|= 2; /* write */
1208 rwx
|= 1; /* read == accept */
1209 uxsel_set(s
->s
, rwx
, net_select_result
);
1212 int net_service_lookup(char *service
)
1215 se
= getservbyname(service
, NULL
);
1217 return ntohs(se
->s_port
);
1222 SockAddr
platform_get_x11_unix_address(int displaynum
, char **canonicalname
)
1224 SockAddr ret
= snew(struct SockAddr_tag
);
1227 memset(ret
, 0, sizeof *ret
);
1228 ret
->family
= AF_UNIX
;
1229 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1230 "%s%d", X11_UNIX_PATH
, displaynum
);
1232 ret
->error
= "snprintf failed";
1233 else if(n
>= sizeof ret
->hostname
)
1234 ret
->error
= "X11 UNIX name too long";
1236 *canonicalname
= dupstr(ret
->hostname
);
1240 ret
->addresses
= NULL
;