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;
225 char *trimmed_host = host_strduptrim(host); /* strip [] on literals */
226 err = getaddrinfo(trimmed_host, NULL, &hints, &ret->ais);
230 ret->error = gai_strerror(err);
233 ret->superfamily = IP;
235 if (ret->ais->ai_canonname != NULL)
236 strncat(realhost, ret->ais->ai_canonname, sizeof(realhost) - 1);
238 strncat(realhost, host, sizeof(realhost) - 1);
240 if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) {
242 * Otherwise use the IPv4-only gethostbyname... (NOTE:
243 * we don't use gethostbyname as a fallback!)
245 if (ret->superfamily == UNRESOLVED) {
246 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
247 if ( (h = gethostbyname(host)) )
248 ret->superfamily = IP;
250 if (ret->superfamily == UNRESOLVED) {
251 ret->error = (h_errno == HOST_NOT_FOUND ||
252 h_errno == NO_DATA ||
253 h_errno == NO_ADDRESS ? "Host does not exist" :
254 h_errno == TRY_AGAIN ?
255 "Temporary name service failure" :
256 "gethostbyname: unknown error");
259 /* This way we are always sure the h->h_name is valid :) */
260 strncpy(realhost, h->h_name, sizeof(realhost));
261 for (n = 0; h->h_addr_list[n]; n++);
262 ret->addresses = snewn(n, unsigned long);
264 for (n = 0; n < ret->naddresses; n++) {
265 memcpy(&a, h->h_addr_list[n], sizeof(a));
266 ret->addresses[n] = ntohl(a);
270 * This must be a numeric IPv4 address because it caused a
271 * success return from inet_addr.
273 ret->superfamily = IP;
274 strncpy(realhost, host, sizeof(realhost));
275 ret->addresses = snew(unsigned long);
277 ret->addresses[0] = ntohl(a);
280 realhost[lenof(realhost)-1] = '\0';
281 *canonicalname = snewn(1+strlen(realhost), char);
282 strcpy(*canonicalname, realhost);
286 SockAddr sk_nonamelookup(const char *host)
288 SockAddr ret = snew(struct SockAddr_tag);
290 ret->superfamily = UNRESOLVED;
291 strncpy(ret->hostname, host, lenof(ret->hostname));
292 ret->hostname[lenof(ret->hostname)-1] = '\0';
296 ret->addresses = NULL;
302 static int sk_nextaddr(SockAddr addr, SockAddrStep *step)
305 if (step->ai && step->ai->ai_next) {
306 step->ai = step->ai->ai_next;
311 if (step->curraddr+1 < addr->naddresses) {
320 void sk_getaddr(SockAddr addr, char *buf, int buflen)
322 if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) {
323 strncpy(buf, addr->hostname, buflen);
324 buf[buflen-1] = '\0';
327 if (getnameinfo(addr->ais->ai_addr, addr->ais->ai_addrlen, buf, buflen,
328 NULL, 0, NI_NUMERICHOST) != 0) {
330 strncat(buf, "<unknown>", buflen - 1);
335 START_STEP(addr, step);
336 assert(SOCKADDR_FAMILY(addr, step) == AF_INET);
337 a.s_addr = htonl(addr->addresses[0]);
338 strncpy(buf, inet_ntoa(a), buflen);
339 buf[buflen-1] = '\0';
344 int sk_addr_needs_port(SockAddr addr)
346 if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) {
353 int sk_hostname_is_local(const char *name)
355 return !strcmp(name, "localhost") ||
356 !strcmp(name, "::1") ||
357 !strncmp(name, "127.", 4);
360 #define ipv4_is_loopback(addr) \
361 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
363 static int sockaddr_is_loopback(struct sockaddr *sa)
365 union sockaddr_union *u = (union sockaddr_union *)sa;
366 switch (u->sa.sa_family) {
368 return ipv4_is_loopback(u->sin.sin_addr);
371 return IN6_IS_ADDR_LOOPBACK(&u->sin6.sin6_addr);
380 int sk_address_is_local(SockAddr addr)
382 if (addr->superfamily == UNRESOLVED)
383 return 0; /* we don't know; assume not */
384 else if (addr->superfamily == UNIX)
388 return sockaddr_is_loopback(addr->ais->ai_addr);
392 START_STEP(addr, step);
393 assert(SOCKADDR_FAMILY(addr, step) == AF_INET);
394 a.s_addr = htonl(addr->addresses[0]);
395 return ipv4_is_loopback(a);
400 int sk_address_is_special_local(SockAddr addr)
402 return addr->superfamily == UNIX;
405 int sk_addrtype(SockAddr addr)
409 START_STEP(addr, step);
410 family = SOCKADDR_FAMILY(addr, step);
412 return (family == AF_INET ? ADDRTYPE_IPV4 :
414 family == AF_INET6 ? ADDRTYPE_IPV6 :
419 void sk_addrcopy(SockAddr addr, char *buf)
423 START_STEP(addr, step);
424 family = SOCKADDR_FAMILY(addr, step);
427 if (family == AF_INET)
428 memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
429 sizeof(struct in_addr));
430 else if (family == AF_INET6)
431 memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
432 sizeof(struct in6_addr));
438 assert(family == AF_INET);
439 a.s_addr = htonl(addr->addresses[step.curraddr]);
440 memcpy(buf, (char*) &a.s_addr, 4);
444 void sk_addr_free(SockAddr addr)
446 if (--addr->refcount > 0)
449 if (addr->ais != NULL)
450 freeaddrinfo(addr->ais);
452 sfree(addr->addresses);
457 SockAddr sk_addr_dup(SockAddr addr)
463 static Plug sk_tcp_plug(Socket sock, Plug p)
465 Actual_Socket s = (Actual_Socket) sock;
472 static void sk_tcp_flush(Socket s)
475 * We send data to the socket as soon as we can anyway,
476 * so we don't need to do anything here. :-)
480 static void sk_tcp_close(Socket s);
481 static int sk_tcp_write(Socket s, const char *data, int len);
482 static int sk_tcp_write_oob(Socket s, const char *data, int len);
483 static void sk_tcp_write_eof(Socket s);
484 static void sk_tcp_set_frozen(Socket s, int is_frozen);
485 static const char *sk_tcp_socket_error(Socket s);
487 static struct socket_function_table tcp_fn_table = {
498 static Socket sk_tcp_accept(accept_ctx_t ctx, Plug plug)
504 * Create Socket structure.
506 ret = snew(struct Socket_tag);
507 ret->fn = &tcp_fn_table;
510 bufchain_init(&ret->output_data);
511 ret->writable = 1; /* to start with */
512 ret->sending_oob = 0;
514 ret->localhost_only = 0; /* unused, but best init anyway */
515 ret->pending_error = 0;
516 ret->oobpending = FALSE;
517 ret->outgoingeof = EOF_NO;
518 ret->incomingeof = FALSE;
520 ret->parent = ret->child = NULL;
527 ret->error = strerror(errno);
539 static int try_connect(Actual_Socket sock)
542 union sockaddr_union u;
543 const union sockaddr_union *sa;
549 * Remove the socket from the tree before we overwrite its
550 * internal socket id, because that forms part of the tree's
551 * sorting criterion. We'll add it back before exiting this
552 * function, whether we changed anything or not.
554 del234(sktree, sock);
559 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
564 family = SOCKADDR_FAMILY(sock->addr, sock->step);
565 assert(family != AF_UNSPEC);
566 s = socket(family, SOCK_STREAM, 0);
576 if (sock->oobinline) {
578 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE,
579 (void *) &b, sizeof(b)) < 0) {
588 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY,
589 (void *) &b, sizeof(b)) < 0) {
596 if (sock->keepalive) {
598 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
599 (void *) &b, sizeof(b)) < 0) {
607 * Bind to local address.
610 localport = 1023; /* count from 1023 downwards */
612 localport = 0; /* just use port 0 (ie kernel picks) */
614 /* BSD IP stacks need sockaddr_in zeroed before filling in */
615 memset(&u,'\0',sizeof(u));
617 /* We don't try to bind to a local address for UNIX domain sockets. (Why
618 * do we bother doing the bind when localport == 0 anyway?) */
619 if (family != AF_UNIX) {
620 /* Loop round trying to bind */
625 if (family == AF_INET6) {
626 /* XXX use getaddrinfo to get a local address? */
627 u.sin6.sin6_family = AF_INET6;
628 u.sin6.sin6_addr = in6addr_any;
629 u.sin6.sin6_port = htons(localport);
630 retcode = bind(s, &u.sa, sizeof(u.sin6));
634 assert(family == AF_INET);
635 u.sin.sin_family = AF_INET;
636 u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
637 u.sin.sin_port = htons(localport);
638 retcode = bind(s, &u.sa, sizeof(u.sin));
645 if (err != EADDRINUSE) /* failed, for a bad reason */
650 break; /* we're only looping once */
653 break; /* we might have got to the end */
661 * Connect to remote address.
666 /* XXX would be better to have got getaddrinfo() to fill in the port. */
667 ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port =
669 sa = (const union sockaddr_union *)sock->step.ai->ai_addr;
670 salen = sock->step.ai->ai_addrlen;
673 ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port =
675 sa = (const union sockaddr_union *)sock->step.ai->ai_addr;
676 salen = sock->step.ai->ai_addrlen;
680 u.sin.sin_family = AF_INET;
681 u.sin.sin_addr.s_addr = htonl(sock->addr->addresses[sock->step.curraddr]);
682 u.sin.sin_port = htons((short) sock->port);
684 salen = sizeof u.sin;
688 assert(sock->port == 0); /* to catch confused people */
689 assert(strlen(sock->addr->hostname) < sizeof u.su.sun_path);
690 u.su.sun_family = AF_UNIX;
691 strcpy(u.su.sun_path, sock->addr->hostname);
697 assert(0 && "unknown address family");
698 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
703 if ((connect(s, &(sa->sa), salen)) < 0) {
704 if ( errno != EINPROGRESS ) {
710 * If we _don't_ get EWOULDBLOCK, the connect has completed
711 * and we should set the socket as connected and writable.
722 * No matter what happened, put the socket back in the tree.
724 add234(sktree, sock);
727 plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err);
731 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
732 int nodelay, int keepalive, Plug plug)
738 * Create Socket structure.
740 ret = snew(struct Socket_tag);
741 ret->fn = &tcp_fn_table;
744 bufchain_init(&ret->output_data);
745 ret->connected = 0; /* to start with */
746 ret->writable = 0; /* to start with */
747 ret->sending_oob = 0;
749 ret->localhost_only = 0; /* unused, but best init anyway */
750 ret->pending_error = 0;
751 ret->parent = ret->child = NULL;
752 ret->oobpending = FALSE;
753 ret->outgoingeof = EOF_NO;
754 ret->incomingeof = FALSE;
757 START_STEP(ret->addr, ret->step);
759 ret->oobinline = oobinline;
760 ret->nodelay = nodelay;
761 ret->keepalive = keepalive;
762 ret->privport = privport;
767 err = try_connect(ret);
768 } while (err && sk_nextaddr(ret->addr, &ret->step));
771 ret->error = strerror(err);
776 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int orig_address_family)
780 struct addrinfo hints, *ai;
783 union sockaddr_union u;
784 union sockaddr_union *addr;
792 * Create Socket structure.
794 ret = snew(struct Socket_tag);
795 ret->fn = &tcp_fn_table;
798 bufchain_init(&ret->output_data);
799 ret->writable = 0; /* to start with */
800 ret->sending_oob = 0;
802 ret->localhost_only = local_host_only;
803 ret->pending_error = 0;
804 ret->parent = ret->child = NULL;
805 ret->oobpending = FALSE;
806 ret->outgoingeof = EOF_NO;
807 ret->incomingeof = FALSE;
813 * Translate address_family from platform-independent constants
814 * into local reality.
816 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
818 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
823 /* Let's default to IPv6.
824 * If the stack doesn't support IPv6, we will fall back to IPv4. */
825 if (address_family == AF_UNSPEC) address_family = AF_INET6;
827 /* No other choice, default to IPv4 */
828 if (address_family == AF_UNSPEC) address_family = AF_INET;
834 s = socket(address_family, SOCK_STREAM, 0);
837 /* If the host doesn't support IPv6 try fallback to IPv4. */
838 if (s < 0 && address_family == AF_INET6) {
839 address_family = AF_INET;
840 s = socket(address_family, SOCK_STREAM, 0);
845 ret->error = strerror(errno);
853 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
854 (const char *)&on, sizeof(on)) < 0) {
855 ret->error = strerror(errno);
861 addr = NULL; addrlen = -1; /* placate optimiser */
863 if (srcaddr != NULL) {
865 hints.ai_flags = AI_NUMERICHOST;
866 hints.ai_family = address_family;
867 hints.ai_socktype = SOCK_STREAM;
868 hints.ai_protocol = 0;
869 hints.ai_addrlen = 0;
870 hints.ai_addr = NULL;
871 hints.ai_canonname = NULL;
872 hints.ai_next = NULL;
873 assert(port >= 0 && port <= 99999);
874 sprintf(portstr, "%d", port);
876 char *trimmed_addr = host_strduptrim(srcaddr);
877 retcode = getaddrinfo(trimmed_addr, portstr, &hints, &ai);
881 addr = (union sockaddr_union *)ai->ai_addr;
882 addrlen = ai->ai_addrlen;
885 memset(&u,'\0',sizeof u);
886 u.sin.sin_family = AF_INET;
887 u.sin.sin_port = htons(port);
888 u.sin.sin_addr.s_addr = inet_addr(srcaddr);
889 if (u.sin.sin_addr.s_addr != (in_addr_t)(-1)) {
890 /* Override localhost_only with specified listen addr. */
891 ret->localhost_only = ipv4_is_loopback(u.sin.sin_addr);
894 addrlen = sizeof(u.sin);
900 memset(&u,'\0',sizeof u);
902 if (address_family == AF_INET6) {
903 u.sin6.sin6_family = AF_INET6;
904 u.sin6.sin6_port = htons(port);
906 u.sin6.sin6_addr = in6addr_loopback;
908 u.sin6.sin6_addr = in6addr_any;
910 addrlen = sizeof(u.sin6);
914 u.sin.sin_family = AF_INET;
915 u.sin.sin_port = htons(port);
917 u.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
919 u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
921 addrlen = sizeof(u.sin);
925 retcode = bind(s, &addr->sa, addrlen);
928 ret->error = strerror(errno);
932 if (listen(s, SOMAXCONN) < 0) {
934 ret->error = strerror(errno);
940 * If we were given ADDRTYPE_UNSPEC, we must also create an
941 * IPv4 listening socket and link it to this one.
943 if (address_family == AF_INET6 && orig_address_family == ADDRTYPE_UNSPEC) {
946 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
947 local_host_only, ADDRTYPE_IPV4);
954 /* If we couldn't create a listening socket on IPv4 as well
955 * as IPv6, we must return an error overall. */
958 return (Socket) other;
972 static void sk_tcp_close(Socket sock)
974 Actual_Socket s = (Actual_Socket) sock;
977 sk_tcp_close((Socket)s->child);
983 sk_addr_free(s->addr);
987 void *sk_getxdmdata(void *sock, int *lenp)
989 Actual_Socket s = (Actual_Socket) sock;
990 union sockaddr_union u;
993 static unsigned int unix_addr = 0xFFFFFFFF;
996 * We must check that this socket really _is_ an Actual_Socket.
998 if (s->fn != &tcp_fn_table)
999 return NULL; /* failure */
1001 addrlen = sizeof(u);
1002 if (getsockname(s->s, &u.sa, &addrlen) < 0)
1004 switch(u.sa.sa_family) {
1007 buf = snewn(*lenp, char);
1008 PUT_32BIT_MSB_FIRST(buf, ntohl(u.sin.sin_addr.s_addr));
1009 PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin.sin_port));
1014 buf = snewn(*lenp, char);
1015 if (IN6_IS_ADDR_V4MAPPED(&u.sin6.sin6_addr)) {
1016 memcpy(buf, u.sin6.sin6_addr.s6_addr + 12, 4);
1017 PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin6.sin6_port));
1019 /* This is stupid, but it's what XLib does. */
1025 buf = snewn(*lenp, char);
1026 PUT_32BIT_MSB_FIRST(buf, unix_addr--);
1027 PUT_16BIT_MSB_FIRST(buf+4, getpid());
1040 * Deal with socket errors detected in try_send().
1042 static void socket_error_callback(void *vs)
1044 Actual_Socket s = (Actual_Socket)vs;
1047 * Just in case other socket work has caused this socket to vanish
1048 * or become somehow non-erroneous before this callback arrived...
1050 if (!find234(sktree, s, NULL) || !s->pending_error)
1054 * An error has occurred on this socket. Pass it to the plug.
1056 plug_closing(s->plug, strerror(s->pending_error), s->pending_error, 0);
1060 * The function which tries to send on a socket once it's deemed
1063 void try_send(Actual_Socket s)
1065 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1069 int len, urgentflag;
1071 if (s->sending_oob) {
1072 urgentflag = MSG_OOB;
1073 len = s->sending_oob;
1077 bufchain_prefix(&s->output_data, &data, &len);
1079 nsent = send(s->s, data, len, urgentflag);
1080 noise_ultralight(nsent);
1082 err = (nsent < 0 ? errno : 0);
1083 if (err == EWOULDBLOCK) {
1085 * Perfectly normal: we've sent all we can for the moment.
1087 s->writable = FALSE;
1091 * We unfortunately can't just call plug_closing(),
1092 * because it's quite likely that we're currently
1093 * _in_ a call from the code we'd be calling back
1094 * to, so we'd have to make half the SSH code
1095 * reentrant. Instead we flag a pending error on
1096 * the socket, to be dealt with (by calling
1097 * plug_closing()) at some suitable future moment.
1099 s->pending_error = err;
1101 * Immediately cease selecting on this socket, so that
1102 * we don't tight-loop repeatedly trying to do
1103 * whatever it was that went wrong.
1107 * Arrange to be called back from the top level to
1108 * deal with the error condition on this socket.
1110 queue_toplevel_callback(socket_error_callback, s);
1114 if (s->sending_oob) {
1116 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1117 s->sending_oob = len - nsent;
1122 bufchain_consume(&s->output_data, nsent);
1128 * If we reach here, we've finished sending everything we might
1129 * have needed to send. Send EOF, if we need to.
1131 if (s->outgoingeof == EOF_PENDING) {
1132 shutdown(s->s, SHUT_WR);
1133 s->outgoingeof = EOF_SENT;
1137 * Also update the select status, because we don't need to select
1138 * for writing any more.
1143 static int sk_tcp_write(Socket sock, const char *buf, int len)
1145 Actual_Socket s = (Actual_Socket) sock;
1147 assert(s->outgoingeof == EOF_NO);
1150 * Add the data to the buffer list on the socket.
1152 bufchain_add(&s->output_data, buf, len);
1155 * Now try sending from the start of the buffer list.
1161 * Update the select() status to correctly reflect whether or
1162 * not we should be selecting for write.
1166 return bufchain_size(&s->output_data);
1169 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1171 Actual_Socket s = (Actual_Socket) sock;
1173 assert(s->outgoingeof == EOF_NO);
1176 * Replace the buffer list on the socket with the data.
1178 bufchain_clear(&s->output_data);
1179 assert(len <= sizeof(s->oobdata));
1180 memcpy(s->oobdata, buf, len);
1181 s->sending_oob = len;
1184 * Now try sending from the start of the buffer list.
1190 * Update the select() status to correctly reflect whether or
1191 * not we should be selecting for write.
1195 return s->sending_oob;
1198 static void sk_tcp_write_eof(Socket sock)
1200 Actual_Socket s = (Actual_Socket) sock;
1202 assert(s->outgoingeof == EOF_NO);
1205 * Mark the socket as pending outgoing EOF.
1207 s->outgoingeof = EOF_PENDING;
1210 * Now try sending from the start of the buffer list.
1216 * Update the select() status to correctly reflect whether or
1217 * not we should be selecting for write.
1222 static int net_select_result(int fd, int event)
1225 char buf[20480]; /* nice big buffer for plenty of speed */
1229 /* Find the Socket structure */
1230 s = find234(sktree, &fd, cmpforsearch);
1232 return 1; /* boggle */
1234 noise_ultralight(event);
1237 case 4: /* exceptional */
1238 if (!s->oobinline) {
1240 * On a non-oobinline socket, this indicates that we
1241 * can immediately perform an OOB read and get back OOB
1242 * data, which we will send to the back end with
1243 * type==2 (urgent data).
1245 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
1246 noise_ultralight(ret);
1248 return plug_closing(s->plug,
1249 ret == 0 ? "Internal networking trouble" :
1250 strerror(errno), errno, 0);
1253 * Receiving actual data on a socket means we can
1254 * stop falling back through the candidate
1255 * addresses to connect to.
1258 sk_addr_free(s->addr);
1261 return plug_receive(s->plug, 2, buf, ret);
1267 * If we reach here, this is an oobinline socket, which
1268 * means we should set s->oobpending and then deal with it
1269 * when we get called for the readability event (which
1270 * should also occur).
1272 s->oobpending = TRUE;
1274 case 1: /* readable; also acceptance */
1277 * On a listening socket, the readability event means a
1278 * connection is ready to be accepted.
1280 union sockaddr_union su;
1281 socklen_t addrlen = sizeof(su);
1283 int t; /* socket of connection */
1285 memset(&su, 0, addrlen);
1286 t = accept(s->s, &su.sa, &addrlen);
1294 if ((!s->addr || s->addr->superfamily != UNIX) &&
1295 s->localhost_only && !sockaddr_is_loopback(&su.sa)) {
1296 close(t); /* someone let nonlocal through?! */
1297 } else if (plug_accepting(s->plug, sk_tcp_accept, actx)) {
1298 close(t); /* denied or error */
1304 * If we reach here, this is not a listening socket, so
1305 * readability really means readability.
1308 /* In the case the socket is still frozen, we don't even bother */
1313 * We have received data on the socket. For an oobinline
1314 * socket, this might be data _before_ an urgent pointer,
1315 * in which case we send it to the back end with type==1
1316 * (data prior to urgent).
1318 if (s->oobinline && s->oobpending) {
1320 if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark)
1321 s->oobpending = FALSE; /* clear this indicator */
1325 ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0);
1326 noise_ultralight(ret);
1328 if (errno == EWOULDBLOCK) {
1334 * An error at this point _might_ be an error reported
1335 * by a non-blocking connect(). So before we return a
1336 * panic status to the user, let's just see whether
1341 plug_log(s->plug, 1, s->addr, s->port, strerror(err), err);
1342 while (s->addr && sk_nextaddr(s->addr, &s->step)) {
1343 err = try_connect(s);
1347 return plug_closing(s->plug, strerror(err), err, 0);
1348 } else if (0 == ret) {
1349 s->incomingeof = TRUE; /* stop trying to read now */
1351 return plug_closing(s->plug, NULL, 0, 0);
1354 * Receiving actual data on a socket means we can
1355 * stop falling back through the candidate
1356 * addresses to connect to.
1359 sk_addr_free(s->addr);
1362 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1365 case 2: /* writable */
1366 if (!s->connected) {
1368 * select() reports a socket as _writable_ when an
1369 * asynchronous connection is completed.
1371 s->connected = s->writable = 1;
1375 int bufsize_before, bufsize_after;
1377 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1379 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1380 if (bufsize_after < bufsize_before)
1381 plug_sent(s->plug, bufsize_after);
1390 * Special error values are returned from sk_namelookup and sk_new
1391 * if there's a problem. These functions extract an error message,
1392 * or return NULL if there's no problem.
1394 const char *sk_addr_error(SockAddr addr)
1398 static const char *sk_tcp_socket_error(Socket sock)
1400 Actual_Socket s = (Actual_Socket) sock;
1404 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1406 Actual_Socket s = (Actual_Socket) sock;
1407 if (s->frozen == is_frozen)
1409 s->frozen = is_frozen;
1413 static void uxsel_tell(Actual_Socket s)
1416 if (!s->pending_error) {
1418 rwx |= 1; /* read == accept */
1421 rwx |= 2; /* write == connect */
1422 if (s->connected && !s->frozen && !s->incomingeof)
1423 rwx |= 1 | 4; /* read, except */
1424 if (bufchain_size(&s->output_data))
1425 rwx |= 2; /* write */
1428 uxsel_set(s->s, rwx, net_select_result);
1431 int net_service_lookup(char *service)
1434 se = getservbyname(service, NULL);
1436 return ntohs(se->s_port);
1441 char *get_hostname(void)
1444 char *hostname = NULL;
1447 hostname = sresize(hostname, len, char);
1448 if ((gethostname(hostname, len) < 0) &&
1449 (errno != ENAMETOOLONG)) {
1454 } while (strlen(hostname) >= len-1);
1458 SockAddr platform_get_x11_unix_address(const char *sockpath, int displaynum)
1460 SockAddr ret = snew(struct SockAddr_tag);
1463 memset(ret, 0, sizeof *ret);
1464 ret->superfamily = UNIX;
1466 * In special circumstances (notably Mac OS X Leopard), we'll
1467 * have been passed an explicit Unix socket path.
1470 n = snprintf(ret->hostname, sizeof ret->hostname,
1473 n = snprintf(ret->hostname, sizeof ret->hostname,
1474 "%s%d", X11_UNIX_PATH, displaynum);
1478 ret->error = "snprintf failed";
1479 else if (n >= sizeof ret->hostname)
1480 ret->error = "X11 UNIX name too long";
1485 ret->addresses = NULL;
1486 ret->naddresses = 0;
1492 SockAddr unix_sock_addr(const char *path)
1494 SockAddr ret = snew(struct SockAddr_tag);
1497 memset(ret, 0, sizeof *ret);
1498 ret->superfamily = UNIX;
1499 n = snprintf(ret->hostname, sizeof ret->hostname, "%s", path);
1502 ret->error = "snprintf failed";
1503 else if (n >= sizeof ret->hostname)
1504 ret->error = "socket pathname too long";
1509 ret->addresses = NULL;
1510 ret->naddresses = 0;
1516 Socket new_unix_listener(SockAddr listenaddr, Plug plug)
1519 union sockaddr_union u;
1520 union sockaddr_union *addr;
1526 * Create Socket structure.
1528 ret = snew(struct Socket_tag);
1529 ret->fn = &tcp_fn_table;
1532 bufchain_init(&ret->output_data);
1533 ret->writable = 0; /* to start with */
1534 ret->sending_oob = 0;
1536 ret->localhost_only = TRUE;
1537 ret->pending_error = 0;
1538 ret->parent = ret->child = NULL;
1539 ret->oobpending = FALSE;
1540 ret->outgoingeof = EOF_NO;
1541 ret->incomingeof = FALSE;
1543 ret->addr = listenaddr;
1546 assert(listenaddr->superfamily == UNIX);
1551 s = socket(AF_UNIX, SOCK_STREAM, 0);
1553 ret->error = strerror(errno);
1554 return (Socket) ret;
1561 memset(&u, '\0', sizeof(u));
1562 u.su.sun_family = AF_UNIX;
1563 strncpy(u.su.sun_path, listenaddr->hostname, sizeof(u.su.sun_path)-1);
1565 addrlen = sizeof(u.su);
1567 if (unlink(u.su.sun_path) < 0 && errno != ENOENT) {
1569 ret->error = strerror(errno);
1570 return (Socket) ret;
1573 retcode = bind(s, &addr->sa, addrlen);
1576 ret->error = strerror(errno);
1577 return (Socket) ret;
1580 if (listen(s, SOMAXCONN) < 0) {
1582 ret->error = strerror(errno);
1583 return (Socket) ret;
1589 add234(sktree, ret);
1591 return (Socket) ret;