1 /* @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC */
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31 static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
35 * svc_tcp.c, Server side for TCP/IP based RPC.
37 * Copyright (C) 1984, Sun Microsystems, Inc.
39 * Actually implements two flavors of transporter -
40 * a tcp rendezvouser (a listener and connection establisher)
41 * and a record/tcp stream.
51 #include <sys/socket.h>
58 # include <libio/iolibio.h>
59 # define fputs(s, f) _IO_fputs (s, f)
64 * Ops vector for TCP/IP based rpc service handle
66 static bool_t svctcp_recv (SVCXPRT *, struct rpc_msg *);
67 static enum xprt_stat svctcp_stat (SVCXPRT *);
68 static bool_t svctcp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
69 static bool_t svctcp_reply (SVCXPRT *, struct rpc_msg *);
70 static bool_t svctcp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
71 static void svctcp_destroy (SVCXPRT *);
73 static const struct xp_ops svctcp_op =
84 * Ops vector for TCP/IP rendezvous handler
86 static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *);
87 static enum xprt_stat rendezvous_stat (SVCXPRT *);
88 static void svctcp_rendezvous_abort (void) attribute_noreturn;
90 /* This function makes sure abort() relocation goes through PLT
91 and thus can be lazy bound. */
93 svctcp_rendezvous_abort (void)
98 static const struct xp_ops svctcp_rendezvous_op =
102 (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
103 (bool_t (*) (SVCXPRT *, struct rpc_msg *)) svctcp_rendezvous_abort,
104 (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
108 static int readtcp (char*, char *, int);
109 static int writetcp (char *, char *, int);
110 static SVCXPRT *makefd_xprt (int, u_int, u_int) internal_function;
112 struct tcp_rendezvous
113 { /* kept in xprt->xp_p1 */
119 { /* kept in xprt->xp_p1 */
120 enum xprt_stat strm_stat;
123 char verf_body[MAX_AUTH_BYTES];
128 * xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
130 * Creates, registers, and returns a (rpc) tcp based transporter.
131 * Once *xprt is initialized, it is registered as a transporter
132 * see (svc.h, xprt_register). This routine returns
133 * a NULL if a problem occurred.
135 * If sock<0 then a socket is created, else sock is used.
136 * If the socket, sock is not bound to a port then svctcp_create
137 * binds it to an arbitrary port. The routine then starts a tcp
138 * listener on the socket's associated port. In any (successful) case,
139 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
140 * associated port number.
142 * Since tcp streams do buffered io similar to stdio, the caller can specify
143 * how big the send and receive buffers are via the second and third parms;
144 * 0 => use the system default.
147 svctcp_create (int sock, u_int sendsize, u_int recvsize)
149 bool_t madesock = FALSE;
151 struct tcp_rendezvous *r;
152 struct sockaddr_in addr;
153 socklen_t len = sizeof (struct sockaddr_in);
155 if (sock == RPC_ANYSOCK)
157 if ((sock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
159 perror (_("svc_tcp.c - tcp socket creation problem"));
160 return (SVCXPRT *) NULL;
164 memset ((char *) &addr, 0, sizeof (addr));
165 addr.sin_family = AF_INET;
166 if (bindresvport (sock, &addr))
169 (void) bind (sock, (struct sockaddr *) &addr, len);
171 if ((getsockname (sock, (struct sockaddr *) &addr, &len) != 0) ||
172 (listen (sock, 2) != 0))
174 perror (_("svc_tcp.c - cannot getsockname or listen"));
177 return (SVCXPRT *) NULL;
179 r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r));
180 xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
181 if (r == NULL || xprt == NULL)
184 if (_IO_fwide (stderr, 0) > 0)
185 (void) __fwprintf (stderr, L"%s", _("svctcp_create: out of memory\n"));
188 (void) fputs (_("svctcp_create: out of memory\n"), stderr);
189 mem_free (r, sizeof (*r));
190 mem_free (xprt, sizeof (SVCXPRT));
193 r->sendsize = sendsize;
194 r->recvsize = recvsize;
196 xprt->xp_p1 = (caddr_t) r;
197 xprt->xp_verf = _null_auth;
198 xprt->xp_ops = &svctcp_rendezvous_op;
199 xprt->xp_port = ntohs (addr.sin_port);
200 xprt->xp_sock = sock;
201 xprt_register (xprt);
206 * Like svtcp_create(), except the routine takes any *open* UNIX file
207 * descriptor as its first input.
210 svcfd_create (int fd, u_int sendsize, u_int recvsize);
212 svcfd_create (int fd, u_int sendsize, u_int recvsize)
214 return makefd_xprt (fd, sendsize, recvsize);
219 makefd_xprt (int fd, u_int sendsize, u_int recvsize)
224 xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
225 cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn));
226 if (xprt == (SVCXPRT *) NULL || cd == NULL)
229 if (_IO_fwide (stderr, 0) > 0)
230 (void) __fwprintf (stderr, L"%s",
231 _("svc_tcp: makefd_xprt: out of memory\n"));
234 (void) fputs (_("svc_tcp: makefd_xprt: out of memory\n"), stderr);
235 mem_free (xprt, sizeof (SVCXPRT));
236 mem_free (cd, sizeof (struct tcp_conn));
239 cd->strm_stat = XPRT_IDLE;
240 xdrrec_create (&(cd->xdrs), sendsize, recvsize,
241 (caddr_t) xprt, readtcp, writetcp);
243 xprt->xp_p1 = (caddr_t) cd;
244 xprt->xp_verf.oa_base = cd->verf_body;
245 xprt->xp_addrlen = 0;
246 xprt->xp_ops = &svctcp_op; /* truly deals with calls */
247 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
249 xprt_register (xprt);
254 rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg attribute_unused)
257 struct tcp_rendezvous *r;
258 struct sockaddr_in addr;
261 r = (struct tcp_rendezvous *) xprt->xp_p1;
263 len = sizeof (struct sockaddr_in);
264 if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0)
271 * make a new transporter (re-uses xprt)
273 xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
274 memcpy (&xprt->xp_raddr, &addr, sizeof (addr));
275 xprt->xp_addrlen = len;
276 return FALSE; /* there is never an rpc msg to be processed */
279 static enum xprt_stat
280 rendezvous_stat (SVCXPRT *xprt attribute_unused)
286 svctcp_destroy (SVCXPRT *xprt)
288 struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1;
290 xprt_unregister (xprt);
291 (void) close (xprt->xp_sock);
292 if (xprt->xp_port != 0)
294 /* a rendezvouser socket */
299 /* an actual connection socket */
300 XDR_DESTROY (&(cd->xdrs));
302 mem_free ((caddr_t) cd, sizeof (struct tcp_conn));
303 mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
308 * reads data from the tcp connection.
309 * any error is fatal and the connection is closed.
310 * (And a read of zero bytes is a half closed stream => error.)
313 readtcp (char *xprtptr, char *buf, int len)
315 SVCXPRT *xprt = (SVCXPRT *)xprtptr;
316 int sock = xprt->xp_sock;
317 int milliseconds = 35 * 1000;
318 struct pollfd pollfd;
323 pollfd.events = POLLIN;
324 switch (poll (&pollfd, 1, milliseconds))
333 if ((pollfd.revents & POLLERR) || (pollfd.revents & POLLHUP)
334 || (pollfd.revents & POLLNVAL))
339 while ((pollfd.revents & POLLIN) == 0);
341 if ((len = read (sock, buf, len)) > 0)
345 ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
350 * writes data to the tcp connection.
351 * Any error is fatal and the connection is closed.
354 writetcp (char *xprtptr, char * buf, int len)
356 SVCXPRT *xprt = (SVCXPRT *)xprtptr;
359 for (cnt = len; cnt > 0; cnt -= i, buf += i)
361 if ((i = write (xprt->xp_sock, buf, cnt)) < 0)
363 ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
370 static enum xprt_stat
371 svctcp_stat (SVCXPRT *xprt)
373 struct tcp_conn *cd =
374 (struct tcp_conn *) (xprt->xp_p1);
376 if (cd->strm_stat == XPRT_DIED)
378 if (!xdrrec_eof (&(cd->xdrs)))
379 return XPRT_MOREREQS;
384 svctcp_recv (SVCXPRT *xprt, struct rpc_msg *msg)
386 struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
387 XDR *xdrs = &(cd->xdrs);
389 xdrs->x_op = XDR_DECODE;
390 (void) xdrrec_skiprecord (xdrs);
391 if (xdr_callmsg (xdrs, msg))
393 cd->x_id = msg->rm_xid;
396 cd->strm_stat = XPRT_DIED; /* XXXX */
401 svctcp_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
403 return ((*xdr_args) (&(((struct tcp_conn *)
404 (xprt->xp_p1))->xdrs), args_ptr));
408 svctcp_freeargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
410 XDR *xdrs = &(((struct tcp_conn *) (xprt->xp_p1))->xdrs);
412 xdrs->x_op = XDR_FREE;
413 return ((*xdr_args) (xdrs, args_ptr));
417 svctcp_reply (SVCXPRT *xprt, struct rpc_msg *msg)
419 struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
420 XDR *xdrs = &(cd->xdrs);
423 xdrs->x_op = XDR_ENCODE;
424 msg->rm_xid = cd->x_id;
425 stat = xdr_replymsg (xdrs, msg);
426 (void) xdrrec_endofrecord (xdrs, TRUE);