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29 * @(#)svc_unix.c 1.21 87/08/11 Copyr 1984 Sun Micro
30 * @(#)svc_unix.c 2.2 88/08/01 4.0 RPCSRC
31 * $FreeBSD: src/lib/libc/rpc/svc_unix.c,v 1.7.2.2 2001/09/05 22:29:23 dec Exp $
32 * $DragonFly: src/lib/libc/rpc/svc_unix.c,v 1.2 2003/06/17 04:26:45 dillon Exp $
36 * svc_unix.c, Server side for TCP/IP based RPC.
38 * Copyright (C) 1984, Sun Microsystems, Inc.
40 * Actually implements two flavors of transporter -
41 * a unix rendezvouser (a listner and connection establisher)
42 * and a record/unix stream.
50 #include <sys/socket.h>
56 * Ops vector for AF_UNIX based rpc service handle
58 static bool_t svcunix_recv();
59 static enum xprt_stat svcunix_stat();
60 static bool_t svcunix_getargs();
61 static bool_t svcunix_reply();
62 static bool_t svcunix_freeargs();
63 static void svcunix_destroy();
65 static struct xp_ops svcunix_op = {
75 * Ops vector for TCP/IP rendezvous handler
77 static bool_t rendezvous_request();
78 static enum xprt_stat rendezvous_stat();
80 static struct xp_ops svcunix_rendezvous_op = {
89 static int readunix(), writeunix();
90 static SVCXPRT *makefd_xprt();
92 struct unix_rendezvous { /* kept in xprt->xp_p1 */
97 struct unix_conn { /* kept in xprt->xp_p1 */
98 enum xprt_stat strm_stat;
101 char verf_body[MAX_AUTH_BYTES];
107 struct cmsgcred cmcred;
110 static struct cmessage cm;
112 static int __msgread(sock, buf, cnt)
120 bzero((char *)&cm, sizeof(cm));
121 iov[0].iov_base = buf;
122 iov[0].iov_len = cnt;
128 msg.msg_control = (caddr_t)&cm;
129 msg.msg_controllen = sizeof(struct cmessage);
132 return(recvmsg(sock, &msg, 0));
135 static int __msgwrite(sock, buf, cnt)
143 bzero((char *)&cm, sizeof(cm));
144 iov[0].iov_base = buf;
145 iov[0].iov_len = cnt;
147 cm.cmsg.cmsg_type = SCM_CREDS;
148 cm.cmsg.cmsg_level = SOL_SOCKET;
149 cm.cmsg.cmsg_len = sizeof(struct cmessage);
155 msg.msg_control = (caddr_t)&cm;
156 msg.msg_controllen = sizeof(struct cmessage);
159 return(sendmsg(sock, &msg, 0));
164 * xprt = svcunix_create(sock, send_buf_size, recv_buf_size);
166 * Creates, registers, and returns a (rpc) unix based transporter.
167 * Once *xprt is initialized, it is registered as a transporter
168 * see (svc.h, xprt_register). This routine returns
169 * a NULL if a problem occurred.
171 * If sock<0 then a socket is created, else sock is used.
172 * If the socket, sock is not bound to a port then svcunix_create
173 * binds it to an arbitrary port. The routine then starts a unix
174 * listener on the socket's associated port. In any (successful) case,
175 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
176 * associated port number.
178 * Since unix streams do buffered io similar to stdio, the caller can specify
179 * how big the send and receive buffers are via the second and third parms;
180 * 0 => use the system default.
183 svcunix_create(sock, sendsize, recvsize, path)
189 bool_t madesock = FALSE;
190 register SVCXPRT *xprt;
191 register struct unix_rendezvous *r;
192 struct sockaddr_un addr;
193 int len = sizeof(struct sockaddr_un);
195 if (sock == RPC_ANYSOCK) {
196 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
197 perror("svc_unix.c - AF_UNIX socket creation problem");
198 return ((SVCXPRT *)NULL);
202 memset(&addr, 0, sizeof (addr));
203 addr.sun_family = AF_UNIX;
204 strcpy(addr.sun_path, path);
205 len = strlen(addr.sun_path) + sizeof(addr.sun_family) +
206 sizeof(addr.sun_len) + 1;
209 bind(sock, (struct sockaddr *)&addr, len);
211 if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
212 (listen(sock, 2) != 0)) {
213 perror("svc_unix.c - cannot getsockname or listen");
216 return ((SVCXPRT *)NULL);
218 r = (struct unix_rendezvous *)mem_alloc(sizeof(*r));
220 (void) fprintf(stderr, "svcunix_create: out of memory\n");
223 r->sendsize = sendsize;
224 r->recvsize = recvsize;
225 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
227 (void) fprintf(stderr, "svcunix_create: out of memory\n");
231 xprt->xp_p1 = (caddr_t)r;
232 xprt->xp_verf = _null_auth;
233 xprt->xp_ops = &svcunix_rendezvous_op;
234 xprt->xp_port = -1 /*ntohs(addr.sin_port)*/;
235 xprt->xp_sock = sock;
241 * Like svunix_create(), except the routine takes any *open* UNIX file
242 * descriptor as its first input.
245 svcunixfd_create(fd, sendsize, recvsize)
251 return (makefd_xprt(fd, sendsize, recvsize));
255 makefd_xprt(fd, sendsize, recvsize)
260 register SVCXPRT *xprt;
261 register struct unix_conn *cd;
263 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
264 if (xprt == (SVCXPRT *)NULL) {
265 (void) fprintf(stderr, "svc_unix: makefd_xprt: out of memory\n");
268 cd = (struct unix_conn *)mem_alloc(sizeof(struct unix_conn));
269 if (cd == (struct unix_conn *)NULL) {
270 (void) fprintf(stderr, "svc_unix: makefd_xprt: out of memory\n");
271 mem_free((char *) xprt, sizeof(SVCXPRT));
272 xprt = (SVCXPRT *)NULL;
275 cd->strm_stat = XPRT_IDLE;
276 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
277 (caddr_t)xprt, readunix, writeunix);
279 xprt->xp_p1 = (caddr_t)cd;
280 xprt->xp_verf.oa_base = cd->verf_body;
281 xprt->xp_addrlen = 0;
282 xprt->xp_ops = &svcunix_op; /* truely deals with calls */
283 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
291 rendezvous_request(xprt)
292 register SVCXPRT *xprt;
295 struct unix_rendezvous *r;
296 struct sockaddr_un addr;
297 struct sockaddr_in in_addr;
300 r = (struct unix_rendezvous *)xprt->xp_p1;
302 len = sizeof(struct sockaddr_in);
303 if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
311 * make a new transporter (re-uses xprt)
313 bzero((char *)&in_addr, sizeof(in_addr));
314 in_addr.sin_family = AF_UNIX;
315 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
316 xprt->xp_raddr = in_addr;
317 xprt->xp_addrlen = len;
318 return (FALSE); /* there is never an rpc msg to be processed */
321 static enum xprt_stat
329 svcunix_destroy(xprt)
330 register SVCXPRT *xprt;
332 register struct unix_conn *cd = (struct unix_conn *)xprt->xp_p1;
334 xprt_unregister(xprt);
335 (void)_close(xprt->xp_sock);
336 if (xprt->xp_port != 0) {
337 /* a rendezvouser socket */
340 /* an actual connection socket */
341 XDR_DESTROY(&(cd->xdrs));
343 mem_free((caddr_t)cd, sizeof(struct unix_conn));
344 mem_free((caddr_t)xprt, sizeof(SVCXPRT));
348 * All read operations timeout after 35 seconds.
349 * A timeout is fatal for the connection.
351 static struct timeval wait_per_try = { 35, 0 };
354 * reads data from the unix conection.
355 * any error is fatal and the connection is closed.
356 * (And a read of zero bytes is a half closed stream => error.)
358 * Note: we have to be careful here not to allow ourselves to become
359 * blocked too long in this routine. While we're waiting for data from one
360 * client, another client may be trying to connect. To avoid this situation,
361 * some code from svc_run() is transplanted here: the select() loop checks
362 * all RPC descriptors including the one we want and calls svc_getreqset2()
363 * to handle new requests if any are detected.
366 readunix(xprt, buf, len)
367 register SVCXPRT *xprt;
371 register int sock = xprt->xp_sock;
372 struct timeval start, delta, tv;
373 struct timeval tmp1, tmp2;
375 extern fd_set *__svc_fdset;
376 extern int __svc_fdsetsize;
378 delta = wait_per_try;
380 gettimeofday(&start, NULL);
382 int bytes = howmany(__svc_fdsetsize, NFDBITS) *
386 fds = (fd_set *)malloc(bytes);
389 memcpy(fds, __svc_fdset, bytes);
391 /* XXX we know the other bits are still clear */
393 tv = delta; /* in case select() implements writeback */
394 switch (select(svc_maxfd + 1, fds, NULL, NULL, &tv)) {
396 memset(fds, 0, bytes);
399 gettimeofday(&tmp1, NULL);
400 timersub(&tmp1, &start, &tmp2);
401 timersub(&wait_per_try, &tmp2, &tmp1);
402 if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
409 if (!FD_ISSET(sock, fds)) {
410 svc_getreqset2(fds, svc_maxfd + 1);
411 gettimeofday(&tmp1, NULL);
412 timersub(&tmp1, &start, &tmp2);
413 timersub(&wait_per_try, &tmp2, &tmp1);
414 if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
420 } while (!FD_ISSET(sock, fds));
421 if ((len = __msgread(sock, buf, len)) > 0) {
427 ((struct unix_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
434 * writes data to the unix connection.
435 * Any error is fatal and the connection is closed.
438 writeunix(xprt, buf, len)
439 register SVCXPRT *xprt;
445 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
446 if ((i = __msgwrite(xprt->xp_sock, buf, cnt)) < 0) {
447 ((struct unix_conn *)(xprt->xp_p1))->strm_stat =
455 static enum xprt_stat
459 register struct unix_conn *cd =
460 (struct unix_conn *)(xprt->xp_p1);
462 if (cd->strm_stat == XPRT_DIED)
464 if (! xdrrec_eof(&(cd->xdrs)))
465 return (XPRT_MOREREQS);
470 svcunix_recv(xprt, msg)
472 register struct rpc_msg *msg;
474 register struct unix_conn *cd =
475 (struct unix_conn *)(xprt->xp_p1);
476 register XDR *xdrs = &(cd->xdrs);
478 xdrs->x_op = XDR_DECODE;
479 (void)xdrrec_skiprecord(xdrs);
480 if (xdr_callmsg(xdrs, msg)) {
481 cd->x_id = msg->rm_xid;
482 /* set up verifiers */
483 msg->rm_call.cb_verf.oa_flavor = AUTH_UNIX;
484 msg->rm_call.cb_verf.oa_base = (caddr_t)&cm;
485 msg->rm_call.cb_verf.oa_length = sizeof(cm);
488 cd->strm_stat = XPRT_DIED; /* XXXX */
493 svcunix_getargs(xprt, xdr_args, args_ptr)
499 return ((*xdr_args)(&(((struct unix_conn *)(xprt->xp_p1))->xdrs), args_ptr));
503 svcunix_freeargs(xprt, xdr_args, args_ptr)
509 &(((struct unix_conn *)(xprt->xp_p1))->xdrs);
511 xdrs->x_op = XDR_FREE;
512 return ((*xdr_args)(xdrs, args_ptr));
516 svcunix_reply(xprt, msg)
518 register struct rpc_msg *msg;
520 register struct unix_conn *cd =
521 (struct unix_conn *)(xprt->xp_p1);
522 register XDR *xdrs = &(cd->xdrs);
523 register bool_t stat;
525 xdrs->x_op = XDR_ENCODE;
526 msg->rm_xid = cd->x_id;
527 stat = xdr_replymsg(xdrs, msg);
528 (void)xdrrec_endofrecord(xdrs, TRUE);