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 * Access to sockaddr types without breaking C strict aliasing rules.
37 union sockaddr_union {
39 struct sockaddr_in storage;
41 struct sockaddr_storage storage;
42 struct sockaddr_in6 sin6;
45 struct sockaddr_in sin;
46 struct sockaddr_un su;
50 * We used to typedef struct Socket_tag *Socket.
52 * Since we have made the networking abstraction slightly more
53 * abstract, Socket no longer means a tcp socket (it could mean
54 * an ssl socket). So now we must use Actual_Socket when we know
55 * we are talking about a tcp socket.
57 typedef struct Socket_tag *Actual_Socket;
60 * Mutable state that goes with a SockAddr: stores information
61 * about where in the list of candidate IP(v*) addresses we've
64 typedef struct SockAddrStep_tag SockAddrStep;
65 struct SockAddrStep_tag {
67 struct addrinfo *ai; /* steps along addr->ais */
73 struct socket_function_table *fn;
74 /* the above variable absolutely *must* be the first in this structure */
79 int connected; /* irrelevant for listening sockets */
81 int frozen; /* this causes readability notifications to be ignored */
82 int localhost_only; /* for listening sockets */
85 int oobpending; /* is there OOB data available to read? */
87 enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
89 int pending_error; /* in case send() returns error */
91 int nodelay, keepalive; /* for connect()-type sockets */
92 int privport, port; /* and again */
96 * We sometimes need pairs of Socket structures to be linked:
97 * if we are listening on the same IPv6 and v4 port, for
98 * example. So here we define `parent' and `child' pointers to
101 Actual_Socket parent, child;
104 struct SockAddr_tag {
107 enum { UNRESOLVED, UNIX, IP } superfamily;
109 struct addrinfo *ais; /* Addresses IPv6 style. */
111 unsigned long *addresses; /* Addresses IPv4 style. */
114 char hostname[512]; /* Store an unresolved host name. */
118 * Which address family this address belongs to. AF_INET for IPv4;
119 * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
120 * not been done and a simple host name is held in this SockAddr
124 #define SOCKADDR_FAMILY(addr, step) \
125 ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
126 (addr)->superfamily == UNIX ? AF_UNIX : \
127 (step).ai ? (step).ai->ai_family : AF_INET)
129 #define SOCKADDR_FAMILY(addr, step) \
130 ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \
131 (addr)->superfamily == UNIX ? AF_UNIX : AF_INET)
135 * Start a SockAddrStep structure to step through multiple
139 #define START_STEP(addr, step) \
140 ((step).ai = (addr)->ais, (step).curraddr = 0)
142 #define START_STEP(addr, step) \
143 ((step).curraddr = 0)
146 static tree234 *sktree;
148 static void uxsel_tell(Actual_Socket s);
150 static int cmpfortree(void *av, void *bv)
152 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
153 int as = a->s, bs = b->s;
165 static int cmpforsearch(void *av, void *bv)
167 Actual_Socket b = (Actual_Socket) bv;
168 int as = *(int *)av, bs = b->s;
178 sktree = newtree234(cmpfortree);
181 void sk_cleanup(void)
187 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
193 SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family)
195 SockAddr ret = snew(struct SockAddr_tag);
197 struct addrinfo hints;
201 struct hostent *h = NULL;
206 /* Clear the structure and default to IPv4. */
207 memset(ret, 0, sizeof(struct SockAddr_tag));
208 ret->superfamily = UNRESOLVED;
214 hints.ai_flags = AI_CANONNAME;
215 hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
216 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
218 hints.ai_socktype = SOCK_STREAM;
219 hints.ai_protocol = 0;
220 hints.ai_addrlen = 0;
221 hints.ai_addr = NULL;
222 hints.ai_canonname = NULL;
223 hints.ai_next = NULL;
224 err = getaddrinfo(host, NULL, &hints, &ret->ais);
226 ret->error = gai_strerror(err);
229 ret->superfamily = IP;
231 if (ret->ais->ai_canonname != NULL)
232 strncat(realhost, ret->ais->ai_canonname, sizeof(realhost) - 1);
234 strncat(realhost, host, sizeof(realhost) - 1);
236 if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) {
238 * Otherwise use the IPv4-only gethostbyname... (NOTE:
239 * we don't use gethostbyname as a fallback!)
241 if (ret->superfamily == UNRESOLVED) {
242 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
243 if ( (h = gethostbyname(host)) )
244 ret->superfamily = IP;
246 if (ret->superfamily == UNRESOLVED) {
247 ret->error = (h_errno == HOST_NOT_FOUND ||
248 h_errno == NO_DATA ||
249 h_errno == NO_ADDRESS ? "Host does not exist" :
250 h_errno == TRY_AGAIN ?
251 "Temporary name service failure" :
252 "gethostbyname: unknown error");
255 /* This way we are always sure the h->h_name is valid :) */
256 strncpy(realhost, h->h_name, sizeof(realhost));
257 for (n = 0; h->h_addr_list[n]; n++);
258 ret->addresses = snewn(n, unsigned long);
260 for (n = 0; n < ret->naddresses; n++) {
261 memcpy(&a, h->h_addr_list[n], sizeof(a));
262 ret->addresses[n] = ntohl(a);
266 * This must be a numeric IPv4 address because it caused a
267 * success return from inet_addr.
269 ret->superfamily = IP;
270 strncpy(realhost, host, sizeof(realhost));
271 ret->addresses = snew(unsigned long);
273 ret->addresses[0] = ntohl(a);
276 realhost[lenof(realhost)-1] = '\0';
277 *canonicalname = snewn(1+strlen(realhost), char);
278 strcpy(*canonicalname, realhost);
282 SockAddr sk_nonamelookup(const char *host)
284 SockAddr ret = snew(struct SockAddr_tag);
286 ret->superfamily = UNRESOLVED;
287 strncpy(ret->hostname, host, lenof(ret->hostname));
288 ret->hostname[lenof(ret->hostname)-1] = '\0';
292 ret->addresses = NULL;
298 static int sk_nextaddr(SockAddr addr, SockAddrStep *step)
301 if (step->ai && step->ai->ai_next) {
302 step->ai = step->ai->ai_next;
307 if (step->curraddr+1 < addr->naddresses) {
316 void sk_getaddr(SockAddr addr, char *buf, int buflen)
318 if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) {
319 strncpy(buf, addr->hostname, buflen);
320 buf[buflen-1] = '\0';
323 if (getnameinfo(addr->ais->ai_addr, addr->ais->ai_addrlen, buf, buflen,
324 NULL, 0, NI_NUMERICHOST) != 0) {
326 strncat(buf, "<unknown>", buflen - 1);
331 START_STEP(addr, step);
332 assert(SOCKADDR_FAMILY(addr, step) == AF_INET);
333 a.s_addr = htonl(addr->addresses[0]);
334 strncpy(buf, inet_ntoa(a), buflen);
335 buf[buflen-1] = '\0';
340 int sk_addr_needs_port(SockAddr addr)
342 if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) {
349 int sk_hostname_is_local(const char *name)
351 return !strcmp(name, "localhost") ||
352 !strcmp(name, "::1") ||
353 !strncmp(name, "127.", 4);
356 #define ipv4_is_loopback(addr) \
357 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
359 static int sockaddr_is_loopback(struct sockaddr *sa)
361 union sockaddr_union *u = (union sockaddr_union *)sa;
362 switch (u->sa.sa_family) {
364 return ipv4_is_loopback(u->sin.sin_addr);
367 return IN6_IS_ADDR_LOOPBACK(&u->sin6.sin6_addr);
376 int sk_address_is_local(SockAddr addr)
378 if (addr->superfamily == UNRESOLVED)
379 return 0; /* we don't know; assume not */
380 else if (addr->superfamily == UNIX)
384 return sockaddr_is_loopback(addr->ais->ai_addr);
388 START_STEP(addr, step);
389 assert(SOCKADDR_FAMILY(addr, step) == AF_INET);
390 a.s_addr = htonl(addr->addresses[0]);
391 return ipv4_is_loopback(a);
396 int sk_address_is_special_local(SockAddr addr)
398 return addr->superfamily == UNIX;
401 int sk_addrtype(SockAddr addr)
405 START_STEP(addr, step);
406 family = SOCKADDR_FAMILY(addr, step);
408 return (family == AF_INET ? ADDRTYPE_IPV4 :
410 family == AF_INET6 ? ADDRTYPE_IPV6 :
415 void sk_addrcopy(SockAddr addr, char *buf)
419 START_STEP(addr, step);
420 family = SOCKADDR_FAMILY(addr, step);
423 if (family == AF_INET)
424 memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
425 sizeof(struct in_addr));
426 else if (family == AF_INET6)
427 memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
428 sizeof(struct in6_addr));
434 assert(family == AF_INET);
435 a.s_addr = htonl(addr->addresses[step.curraddr]);
436 memcpy(buf, (char*) &a.s_addr, 4);
440 void sk_addr_free(SockAddr addr)
442 if (--addr->refcount > 0)
445 if (addr->ais != NULL)
446 freeaddrinfo(addr->ais);
448 sfree(addr->addresses);
453 SockAddr sk_addr_dup(SockAddr addr)
459 static Plug sk_tcp_plug(Socket sock, Plug p)
461 Actual_Socket s = (Actual_Socket) sock;
468 static void sk_tcp_flush(Socket s)
471 * We send data to the socket as soon as we can anyway,
472 * so we don't need to do anything here. :-)
476 static void sk_tcp_close(Socket s);
477 static int sk_tcp_write(Socket s, const char *data, int len);
478 static int sk_tcp_write_oob(Socket s, const char *data, int len);
479 static void sk_tcp_write_eof(Socket s);
480 static void sk_tcp_set_frozen(Socket s, int is_frozen);
481 static const char *sk_tcp_socket_error(Socket s);
483 static struct socket_function_table tcp_fn_table = {
494 static Socket sk_tcp_accept(accept_ctx_t ctx, Plug plug)
500 * Create Socket structure.
502 ret = snew(struct Socket_tag);
503 ret->fn = &tcp_fn_table;
506 bufchain_init(&ret->output_data);
507 ret->writable = 1; /* to start with */
508 ret->sending_oob = 0;
510 ret->localhost_only = 0; /* unused, but best init anyway */
511 ret->pending_error = 0;
512 ret->oobpending = FALSE;
513 ret->outgoingeof = EOF_NO;
514 ret->incomingeof = FALSE;
516 ret->parent = ret->child = NULL;
523 ret->error = strerror(errno);
535 static int try_connect(Actual_Socket sock)
538 union sockaddr_union u;
539 const union sockaddr_union *sa;
545 * Remove the socket from the tree before we overwrite its
546 * internal socket id, because that forms part of the tree's
547 * sorting criterion. We'll add it back before exiting this
548 * function, whether we changed anything or not.
550 del234(sktree, sock);
555 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
560 family = SOCKADDR_FAMILY(sock->addr, sock->step);
561 assert(family != AF_UNSPEC);
562 s = socket(family, SOCK_STREAM, 0);
572 if (sock->oobinline) {
574 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE,
575 (void *) &b, sizeof(b)) < 0) {
584 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY,
585 (void *) &b, sizeof(b)) < 0) {
592 if (sock->keepalive) {
594 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
595 (void *) &b, sizeof(b)) < 0) {
603 * Bind to local address.
606 localport = 1023; /* count from 1023 downwards */
608 localport = 0; /* just use port 0 (ie kernel picks) */
610 /* BSD IP stacks need sockaddr_in zeroed before filling in */
611 memset(&u,'\0',sizeof(u));
613 /* We don't try to bind to a local address for UNIX domain sockets. (Why
614 * do we bother doing the bind when localport == 0 anyway?) */
615 if (family != AF_UNIX) {
616 /* Loop round trying to bind */
621 if (family == AF_INET6) {
622 /* XXX use getaddrinfo to get a local address? */
623 u.sin6.sin6_family = AF_INET6;
624 u.sin6.sin6_addr = in6addr_any;
625 u.sin6.sin6_port = htons(localport);
626 retcode = bind(s, &u.sa, sizeof(u.sin6));
630 assert(family == AF_INET);
631 u.sin.sin_family = AF_INET;
632 u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
633 u.sin.sin_port = htons(localport);
634 retcode = bind(s, &u.sa, sizeof(u.sin));
641 if (err != EADDRINUSE) /* failed, for a bad reason */
646 break; /* we're only looping once */
649 break; /* we might have got to the end */
657 * Connect to remote address.
662 /* XXX would be better to have got getaddrinfo() to fill in the port. */
663 ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port =
665 sa = (const union sockaddr_union *)sock->step.ai->ai_addr;
666 salen = sock->step.ai->ai_addrlen;
669 ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port =
671 sa = (const union sockaddr_union *)sock->step.ai->ai_addr;
672 salen = sock->step.ai->ai_addrlen;
676 u.sin.sin_family = AF_INET;
677 u.sin.sin_addr.s_addr = htonl(sock->addr->addresses[sock->step.curraddr]);
678 u.sin.sin_port = htons((short) sock->port);
680 salen = sizeof u.sin;
684 assert(sock->port == 0); /* to catch confused people */
685 assert(strlen(sock->addr->hostname) < sizeof u.su.sun_path);
686 u.su.sun_family = AF_UNIX;
687 strcpy(u.su.sun_path, sock->addr->hostname);
693 assert(0 && "unknown address family");
694 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
699 if ((connect(s, &(sa->sa), salen)) < 0) {
700 if ( errno != EINPROGRESS ) {
706 * If we _don't_ get EWOULDBLOCK, the connect has completed
707 * and we should set the socket as connected and writable.
718 * No matter what happened, put the socket back in the tree.
720 add234(sktree, sock);
723 plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err);
727 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
728 int nodelay, int keepalive, Plug plug)
734 * Create Socket structure.
736 ret = snew(struct Socket_tag);
737 ret->fn = &tcp_fn_table;
740 bufchain_init(&ret->output_data);
741 ret->connected = 0; /* to start with */
742 ret->writable = 0; /* to start with */
743 ret->sending_oob = 0;
745 ret->localhost_only = 0; /* unused, but best init anyway */
746 ret->pending_error = 0;
747 ret->parent = ret->child = NULL;
748 ret->oobpending = FALSE;
749 ret->outgoingeof = EOF_NO;
750 ret->incomingeof = FALSE;
753 START_STEP(ret->addr, ret->step);
755 ret->oobinline = oobinline;
756 ret->nodelay = nodelay;
757 ret->keepalive = keepalive;
758 ret->privport = privport;
763 err = try_connect(ret);
764 } while (err && sk_nextaddr(ret->addr, &ret->step));
767 ret->error = strerror(err);
772 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int orig_address_family)
776 struct addrinfo hints, *ai;
779 union sockaddr_union u;
780 union sockaddr_union *addr;
788 * Create Socket structure.
790 ret = snew(struct Socket_tag);
791 ret->fn = &tcp_fn_table;
794 bufchain_init(&ret->output_data);
795 ret->writable = 0; /* to start with */
796 ret->sending_oob = 0;
798 ret->localhost_only = local_host_only;
799 ret->pending_error = 0;
800 ret->parent = ret->child = NULL;
801 ret->oobpending = FALSE;
802 ret->outgoingeof = EOF_NO;
803 ret->incomingeof = FALSE;
809 * Translate address_family from platform-independent constants
810 * into local reality.
812 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
814 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
819 /* Let's default to IPv6.
820 * If the stack doesn't support IPv6, we will fall back to IPv4. */
821 if (address_family == AF_UNSPEC) address_family = AF_INET6;
823 /* No other choice, default to IPv4 */
824 if (address_family == AF_UNSPEC) address_family = AF_INET;
830 s = socket(address_family, SOCK_STREAM, 0);
833 /* If the host doesn't support IPv6 try fallback to IPv4. */
834 if (s < 0 && address_family == AF_INET6) {
835 address_family = AF_INET;
836 s = socket(address_family, SOCK_STREAM, 0);
841 ret->error = strerror(errno);
849 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
850 (const char *)&on, sizeof(on)) < 0) {
851 ret->error = strerror(errno);
857 addr = NULL; addrlen = -1; /* placate optimiser */
859 if (srcaddr != NULL) {
861 hints.ai_flags = AI_NUMERICHOST;
862 hints.ai_family = address_family;
863 hints.ai_socktype = SOCK_STREAM;
864 hints.ai_protocol = 0;
865 hints.ai_addrlen = 0;
866 hints.ai_addr = NULL;
867 hints.ai_canonname = NULL;
868 hints.ai_next = NULL;
869 assert(port >= 0 && port <= 99999);
870 sprintf(portstr, "%d", port);
871 retcode = getaddrinfo(srcaddr, portstr, &hints, &ai);
873 addr = (union sockaddr_union *)ai->ai_addr;
874 addrlen = ai->ai_addrlen;
877 memset(&u,'\0',sizeof u);
878 u.sin.sin_family = AF_INET;
879 u.sin.sin_port = htons(port);
880 u.sin.sin_addr.s_addr = inet_addr(srcaddr);
881 if (u.sin.sin_addr.s_addr != (in_addr_t)(-1)) {
882 /* Override localhost_only with specified listen addr. */
883 ret->localhost_only = ipv4_is_loopback(u.sin.sin_addr);
886 addrlen = sizeof(u.sin);
892 memset(&u,'\0',sizeof u);
894 if (address_family == AF_INET6) {
895 u.sin6.sin6_family = AF_INET6;
896 u.sin6.sin6_port = htons(port);
898 u.sin6.sin6_addr = in6addr_loopback;
900 u.sin6.sin6_addr = in6addr_any;
902 addrlen = sizeof(u.sin6);
906 u.sin.sin_family = AF_INET;
907 u.sin.sin_port = htons(port);
909 u.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
911 u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
913 addrlen = sizeof(u.sin);
917 retcode = bind(s, &addr->sa, addrlen);
920 ret->error = strerror(errno);
924 if (listen(s, SOMAXCONN) < 0) {
926 ret->error = strerror(errno);
932 * If we were given ADDRTYPE_UNSPEC, we must also create an
933 * IPv4 listening socket and link it to this one.
935 if (address_family == AF_INET6 && orig_address_family == ADDRTYPE_UNSPEC) {
938 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
939 local_host_only, ADDRTYPE_IPV4);
946 /* If we couldn't create a listening socket on IPv4 as well
947 * as IPv6, we must return an error overall. */
950 return (Socket) other;
964 static void sk_tcp_close(Socket sock)
966 Actual_Socket s = (Actual_Socket) sock;
969 sk_tcp_close((Socket)s->child);
975 sk_addr_free(s->addr);
979 void *sk_getxdmdata(void *sock, int *lenp)
981 Actual_Socket s = (Actual_Socket) sock;
982 union sockaddr_union u;
985 static unsigned int unix_addr = 0xFFFFFFFF;
988 * We must check that this socket really _is_ an Actual_Socket.
990 if (s->fn != &tcp_fn_table)
991 return NULL; /* failure */
994 if (getsockname(s->s, &u.sa, &addrlen) < 0)
996 switch(u.sa.sa_family) {
999 buf = snewn(*lenp, char);
1000 PUT_32BIT_MSB_FIRST(buf, ntohl(u.sin.sin_addr.s_addr));
1001 PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin.sin_port));
1006 buf = snewn(*lenp, char);
1007 if (IN6_IS_ADDR_V4MAPPED(&u.sin6.sin6_addr)) {
1008 memcpy(buf, u.sin6.sin6_addr.s6_addr + 12, 4);
1009 PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin6.sin6_port));
1011 /* This is stupid, but it's what XLib does. */
1017 buf = snewn(*lenp, char);
1018 PUT_32BIT_MSB_FIRST(buf, unix_addr--);
1019 PUT_16BIT_MSB_FIRST(buf+4, getpid());
1032 * Deal with socket errors detected in try_send().
1034 static void socket_error_callback(void *vs)
1036 Actual_Socket s = (Actual_Socket)vs;
1039 * Just in case other socket work has caused this socket to vanish
1040 * or become somehow non-erroneous before this callback arrived...
1042 if (!find234(sktree, s, NULL) || !s->pending_error)
1046 * An error has occurred on this socket. Pass it to the plug.
1048 plug_closing(s->plug, strerror(s->pending_error), s->pending_error, 0);
1052 * The function which tries to send on a socket once it's deemed
1055 void try_send(Actual_Socket s)
1057 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1061 int len, urgentflag;
1063 if (s->sending_oob) {
1064 urgentflag = MSG_OOB;
1065 len = s->sending_oob;
1069 bufchain_prefix(&s->output_data, &data, &len);
1071 nsent = send(s->s, data, len, urgentflag);
1072 noise_ultralight(nsent);
1074 err = (nsent < 0 ? errno : 0);
1075 if (err == EWOULDBLOCK) {
1077 * Perfectly normal: we've sent all we can for the moment.
1079 s->writable = FALSE;
1083 * We unfortunately can't just call plug_closing(),
1084 * because it's quite likely that we're currently
1085 * _in_ a call from the code we'd be calling back
1086 * to, so we'd have to make half the SSH code
1087 * reentrant. Instead we flag a pending error on
1088 * the socket, to be dealt with (by calling
1089 * plug_closing()) at some suitable future moment.
1091 s->pending_error = err;
1093 * Immediately cease selecting on this socket, so that
1094 * we don't tight-loop repeatedly trying to do
1095 * whatever it was that went wrong.
1099 * Arrange to be called back from the top level to
1100 * deal with the error condition on this socket.
1102 queue_toplevel_callback(socket_error_callback, s);
1106 if (s->sending_oob) {
1108 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1109 s->sending_oob = len - nsent;
1114 bufchain_consume(&s->output_data, nsent);
1120 * If we reach here, we've finished sending everything we might
1121 * have needed to send. Send EOF, if we need to.
1123 if (s->outgoingeof == EOF_PENDING) {
1124 shutdown(s->s, SHUT_WR);
1125 s->outgoingeof = EOF_SENT;
1129 * Also update the select status, because we don't need to select
1130 * for writing any more.
1135 static int sk_tcp_write(Socket sock, const char *buf, int len)
1137 Actual_Socket s = (Actual_Socket) sock;
1139 assert(s->outgoingeof == EOF_NO);
1142 * Add the data to the buffer list on the socket.
1144 bufchain_add(&s->output_data, buf, len);
1147 * Now try sending from the start of the buffer list.
1153 * Update the select() status to correctly reflect whether or
1154 * not we should be selecting for write.
1158 return bufchain_size(&s->output_data);
1161 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1163 Actual_Socket s = (Actual_Socket) sock;
1165 assert(s->outgoingeof == EOF_NO);
1168 * Replace the buffer list on the socket with the data.
1170 bufchain_clear(&s->output_data);
1171 assert(len <= sizeof(s->oobdata));
1172 memcpy(s->oobdata, buf, len);
1173 s->sending_oob = len;
1176 * Now try sending from the start of the buffer list.
1182 * Update the select() status to correctly reflect whether or
1183 * not we should be selecting for write.
1187 return s->sending_oob;
1190 static void sk_tcp_write_eof(Socket sock)
1192 Actual_Socket s = (Actual_Socket) sock;
1194 assert(s->outgoingeof == EOF_NO);
1197 * Mark the socket as pending outgoing EOF.
1199 s->outgoingeof = EOF_PENDING;
1202 * Now try sending from the start of the buffer list.
1208 * Update the select() status to correctly reflect whether or
1209 * not we should be selecting for write.
1214 static int net_select_result(int fd, int event)
1217 char buf[20480]; /* nice big buffer for plenty of speed */
1221 /* Find the Socket structure */
1222 s = find234(sktree, &fd, cmpforsearch);
1224 return 1; /* boggle */
1226 noise_ultralight(event);
1229 case 4: /* exceptional */
1230 if (!s->oobinline) {
1232 * On a non-oobinline socket, this indicates that we
1233 * can immediately perform an OOB read and get back OOB
1234 * data, which we will send to the back end with
1235 * type==2 (urgent data).
1237 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
1238 noise_ultralight(ret);
1240 return plug_closing(s->plug,
1241 ret == 0 ? "Internal networking trouble" :
1242 strerror(errno), errno, 0);
1245 * Receiving actual data on a socket means we can
1246 * stop falling back through the candidate
1247 * addresses to connect to.
1250 sk_addr_free(s->addr);
1253 return plug_receive(s->plug, 2, buf, ret);
1259 * If we reach here, this is an oobinline socket, which
1260 * means we should set s->oobpending and then deal with it
1261 * when we get called for the readability event (which
1262 * should also occur).
1264 s->oobpending = TRUE;
1266 case 1: /* readable; also acceptance */
1269 * On a listening socket, the readability event means a
1270 * connection is ready to be accepted.
1272 union sockaddr_union su;
1273 socklen_t addrlen = sizeof(su);
1275 int t; /* socket of connection */
1277 memset(&su, 0, addrlen);
1278 t = accept(s->s, &su.sa, &addrlen);
1286 if ((!s->addr || s->addr->superfamily != UNIX) &&
1287 s->localhost_only && !sockaddr_is_loopback(&su.sa)) {
1288 close(t); /* someone let nonlocal through?! */
1289 } else if (plug_accepting(s->plug, sk_tcp_accept, actx)) {
1290 close(t); /* denied or error */
1296 * If we reach here, this is not a listening socket, so
1297 * readability really means readability.
1300 /* In the case the socket is still frozen, we don't even bother */
1305 * We have received data on the socket. For an oobinline
1306 * socket, this might be data _before_ an urgent pointer,
1307 * in which case we send it to the back end with type==1
1308 * (data prior to urgent).
1310 if (s->oobinline && s->oobpending) {
1312 if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark)
1313 s->oobpending = FALSE; /* clear this indicator */
1317 ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0);
1318 noise_ultralight(ret);
1320 if (errno == EWOULDBLOCK) {
1326 * An error at this point _might_ be an error reported
1327 * by a non-blocking connect(). So before we return a
1328 * panic status to the user, let's just see whether
1333 plug_log(s->plug, 1, s->addr, s->port, strerror(err), err);
1334 while (s->addr && sk_nextaddr(s->addr, &s->step)) {
1335 err = try_connect(s);
1339 return plug_closing(s->plug, strerror(err), err, 0);
1340 } else if (0 == ret) {
1341 s->incomingeof = TRUE; /* stop trying to read now */
1343 return plug_closing(s->plug, NULL, 0, 0);
1346 * Receiving actual data on a socket means we can
1347 * stop falling back through the candidate
1348 * addresses to connect to.
1351 sk_addr_free(s->addr);
1354 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1357 case 2: /* writable */
1358 if (!s->connected) {
1360 * select() reports a socket as _writable_ when an
1361 * asynchronous connection is completed.
1363 s->connected = s->writable = 1;
1367 int bufsize_before, bufsize_after;
1369 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1371 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1372 if (bufsize_after < bufsize_before)
1373 plug_sent(s->plug, bufsize_after);
1382 * Special error values are returned from sk_namelookup and sk_new
1383 * if there's a problem. These functions extract an error message,
1384 * or return NULL if there's no problem.
1386 const char *sk_addr_error(SockAddr addr)
1390 static const char *sk_tcp_socket_error(Socket sock)
1392 Actual_Socket s = (Actual_Socket) sock;
1396 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1398 Actual_Socket s = (Actual_Socket) sock;
1399 if (s->frozen == is_frozen)
1401 s->frozen = is_frozen;
1405 static void uxsel_tell(Actual_Socket s)
1408 if (!s->pending_error) {
1410 rwx |= 1; /* read == accept */
1413 rwx |= 2; /* write == connect */
1414 if (s->connected && !s->frozen && !s->incomingeof)
1415 rwx |= 1 | 4; /* read, except */
1416 if (bufchain_size(&s->output_data))
1417 rwx |= 2; /* write */
1420 uxsel_set(s->s, rwx, net_select_result);
1423 int net_service_lookup(char *service)
1426 se = getservbyname(service, NULL);
1428 return ntohs(se->s_port);
1433 char *get_hostname(void)
1436 char *hostname = NULL;
1439 hostname = sresize(hostname, len, char);
1440 if ((gethostname(hostname, len) < 0) &&
1441 (errno != ENAMETOOLONG)) {
1446 } while (strlen(hostname) >= len-1);
1450 SockAddr platform_get_x11_unix_address(const char *sockpath, int displaynum)
1452 SockAddr ret = snew(struct SockAddr_tag);
1455 memset(ret, 0, sizeof *ret);
1456 ret->superfamily = UNIX;
1458 * In special circumstances (notably Mac OS X Leopard), we'll
1459 * have been passed an explicit Unix socket path.
1462 n = snprintf(ret->hostname, sizeof ret->hostname,
1465 n = snprintf(ret->hostname, sizeof ret->hostname,
1466 "%s%d", X11_UNIX_PATH, displaynum);
1470 ret->error = "snprintf failed";
1471 else if (n >= sizeof ret->hostname)
1472 ret->error = "X11 UNIX name too long";
1477 ret->addresses = NULL;
1478 ret->naddresses = 0;
1484 SockAddr unix_sock_addr(const char *path)
1486 SockAddr ret = snew(struct SockAddr_tag);
1489 memset(ret, 0, sizeof *ret);
1490 ret->superfamily = UNIX;
1491 n = snprintf(ret->hostname, sizeof ret->hostname, "%s", path);
1494 ret->error = "snprintf failed";
1495 else if (n >= sizeof ret->hostname)
1496 ret->error = "socket pathname too long";
1501 ret->addresses = NULL;
1502 ret->naddresses = 0;
1508 Socket new_unix_listener(SockAddr listenaddr, Plug plug)
1511 union sockaddr_union u;
1512 union sockaddr_union *addr;
1518 * Create Socket structure.
1520 ret = snew(struct Socket_tag);
1521 ret->fn = &tcp_fn_table;
1524 bufchain_init(&ret->output_data);
1525 ret->writable = 0; /* to start with */
1526 ret->sending_oob = 0;
1528 ret->localhost_only = TRUE;
1529 ret->pending_error = 0;
1530 ret->parent = ret->child = NULL;
1531 ret->oobpending = FALSE;
1532 ret->outgoingeof = EOF_NO;
1533 ret->incomingeof = FALSE;
1535 ret->addr = listenaddr;
1538 assert(listenaddr->superfamily == UNIX);
1543 s = socket(AF_UNIX, SOCK_STREAM, 0);
1545 ret->error = strerror(errno);
1546 return (Socket) ret;
1553 memset(&u, '\0', sizeof(u));
1554 u.su.sun_family = AF_UNIX;
1555 strncpy(u.su.sun_path, listenaddr->hostname, sizeof(u.su.sun_path)-1);
1557 addrlen = sizeof(u.su);
1559 if (unlink(u.su.sun_path) < 0 && errno != ENOENT) {
1561 ret->error = strerror(errno);
1562 return (Socket) ret;
1565 retcode = bind(s, &addr->sa, addrlen);
1568 ret->error = strerror(errno);
1569 return (Socket) ret;
1572 if (listen(s, SOMAXCONN) < 0) {
1574 ret->error = strerror(errno);
1575 return (Socket) ret;
1581 add234(sktree, ret);
1583 return (Socket) ret;