1 /* @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC */
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30 #if !defined(lint) && defined(SCCSIDS)
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.
49 #include <sys/socket.h>
56 # include <libio/iolibio.h>
60 * Ops vector for TCP/IP based rpc service handle
62 static bool_t svctcp_recv (SVCXPRT *, struct rpc_msg *);
63 static enum xprt_stat svctcp_stat (SVCXPRT *);
64 static bool_t svctcp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
65 static bool_t svctcp_reply (SVCXPRT *, struct rpc_msg *);
66 static bool_t svctcp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
67 static void svctcp_destroy (SVCXPRT *);
69 static const struct xp_ops svctcp_op =
80 * Ops vector for TCP/IP rendezvous handler
82 static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *);
83 static enum xprt_stat rendezvous_stat (SVCXPRT *);
84 static void svctcp_rendezvous_abort (void) __attribute__ ((__noreturn__));
86 /* This function makes sure abort() relocation goes through PLT
87 and thus can be lazy bound. */
89 svctcp_rendezvous_abort (void)
94 static const struct xp_ops svctcp_rendezvous_op =
98 (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
99 (bool_t (*) (SVCXPRT *, struct rpc_msg *)) svctcp_rendezvous_abort,
100 (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
104 static int readtcp (char*, char *, int);
105 static int writetcp (char *, char *, int);
106 static SVCXPRT *makefd_xprt (int, u_int, u_int) internal_function;
108 struct tcp_rendezvous
109 { /* kept in xprt->xp_p1 */
115 { /* kept in xprt->xp_p1 */
116 enum xprt_stat strm_stat;
119 char verf_body[MAX_AUTH_BYTES];
124 * xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
126 * Creates, registers, and returns a (rpc) tcp based transporter.
127 * Once *xprt is initialized, it is registered as a transporter
128 * see (svc.h, xprt_register). This routine returns
129 * a NULL if a problem occurred.
131 * If sock<0 then a socket is created, else sock is used.
132 * If the socket, sock is not bound to a port then svctcp_create
133 * binds it to an arbitrary port. The routine then starts a tcp
134 * listener on the socket's associated port. In any (successful) case,
135 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
136 * associated port number.
138 * Since tcp streams do buffered io similar to stdio, the caller can specify
139 * how big the send and receive buffers are via the second and third parms;
140 * 0 => use the system default.
143 svctcp_create (int sock, u_int sendsize, u_int recvsize)
145 bool_t madesock = FALSE;
147 struct tcp_rendezvous *r;
148 struct sockaddr_in addr;
149 socklen_t len = sizeof (struct sockaddr_in);
151 if (sock == RPC_ANYSOCK)
153 if ((sock = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
155 perror (_("svc_tcp.c - tcp socket creation problem"));
156 return (SVCXPRT *) NULL;
160 __bzero ((char *) &addr, sizeof (addr));
161 addr.sin_family = AF_INET;
162 if (bindresvport (sock, &addr))
165 (void) __bind (sock, (struct sockaddr *) &addr, len);
167 if ((__getsockname (sock, (struct sockaddr *) &addr, &len) != 0) ||
168 (__listen (sock, SOMAXCONN) != 0))
170 perror (_("svc_tcp.c - cannot getsockname or listen"));
172 (void) __close (sock);
173 return (SVCXPRT *) NULL;
175 r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r));
176 xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
177 if (r == NULL || xprt == NULL)
179 (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
180 mem_free (r, sizeof (*r));
181 mem_free (xprt, sizeof (SVCXPRT));
184 r->sendsize = sendsize;
185 r->recvsize = recvsize;
187 xprt->xp_p1 = (caddr_t) r;
188 xprt->xp_verf = _null_auth;
189 xprt->xp_ops = &svctcp_rendezvous_op;
190 xprt->xp_port = ntohs (addr.sin_port);
191 xprt->xp_sock = sock;
192 xprt_register (xprt);
197 * Like svtcp_create(), except the routine takes any *open* UNIX file
198 * descriptor as its first input.
201 svcfd_create (int fd, u_int sendsize, u_int recvsize)
203 return makefd_xprt (fd, sendsize, recvsize);
208 makefd_xprt (int fd, u_int sendsize, u_int recvsize)
213 xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
214 cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn));
215 if (xprt == (SVCXPRT *) NULL || cd == NULL)
217 (void) __fxprintf (NULL, "%s: %s", "svc_tcp: makefd_xprt",
218 _("out of memory\n"));
219 mem_free (xprt, sizeof (SVCXPRT));
220 mem_free (cd, sizeof (struct tcp_conn));
223 cd->strm_stat = XPRT_IDLE;
224 INTUSE(xdrrec_create) (&(cd->xdrs), sendsize, recvsize,
225 (caddr_t) xprt, readtcp, writetcp);
227 xprt->xp_p1 = (caddr_t) cd;
228 xprt->xp_verf.oa_base = cd->verf_body;
229 xprt->xp_addrlen = 0;
230 xprt->xp_ops = &svctcp_op; /* truly deals with calls */
231 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
233 xprt_register (xprt);
238 rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg)
241 struct tcp_rendezvous *r;
242 struct sockaddr_in addr;
245 r = (struct tcp_rendezvous *) xprt->xp_p1;
247 len = sizeof (struct sockaddr_in);
248 if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0)
255 * make a new transporter (re-uses xprt)
257 xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
258 memcpy (&xprt->xp_raddr, &addr, sizeof (addr));
259 xprt->xp_addrlen = len;
260 return FALSE; /* there is never an rpc msg to be processed */
263 static enum xprt_stat
264 rendezvous_stat (SVCXPRT *xprt)
270 svctcp_destroy (SVCXPRT *xprt)
272 struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1;
274 xprt_unregister (xprt);
275 (void) __close (xprt->xp_sock);
276 if (xprt->xp_port != 0)
278 /* a rendezvouser socket */
283 /* an actual connection socket */
284 XDR_DESTROY (&(cd->xdrs));
286 mem_free ((caddr_t) cd, sizeof (struct tcp_conn));
287 mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
292 * reads data from the tcp connection.
293 * any error is fatal and the connection is closed.
294 * (And a read of zero bytes is a half closed stream => error.)
297 readtcp (char *xprtptr, char *buf, int len)
299 SVCXPRT *xprt = (SVCXPRT *)xprtptr;
300 int sock = xprt->xp_sock;
301 int milliseconds = 35 * 1000;
302 struct pollfd pollfd;
307 pollfd.events = POLLIN;
308 switch (__poll (&pollfd, 1, milliseconds))
317 if ((pollfd.revents & POLLERR) || (pollfd.revents & POLLHUP)
318 || (pollfd.revents & POLLNVAL))
323 while ((pollfd.revents & POLLIN) == 0);
325 if ((len = __read (sock, buf, len)) > 0)
329 ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
334 * writes data to the tcp connection.
335 * Any error is fatal and the connection is closed.
338 writetcp (char *xprtptr, char * buf, int len)
340 SVCXPRT *xprt = (SVCXPRT *)xprtptr;
343 for (cnt = len; cnt > 0; cnt -= i, buf += i)
345 if ((i = __write (xprt->xp_sock, buf, cnt)) < 0)
347 ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
354 static enum xprt_stat
355 svctcp_stat (SVCXPRT *xprt)
357 struct tcp_conn *cd =
358 (struct tcp_conn *) (xprt->xp_p1);
360 if (cd->strm_stat == XPRT_DIED)
362 if (!INTUSE(xdrrec_eof) (&(cd->xdrs)))
363 return XPRT_MOREREQS;
368 svctcp_recv (SVCXPRT *xprt, struct rpc_msg *msg)
370 struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
371 XDR *xdrs = &(cd->xdrs);
373 xdrs->x_op = XDR_DECODE;
374 (void) INTUSE(xdrrec_skiprecord) (xdrs);
375 if (INTUSE(xdr_callmsg) (xdrs, msg))
377 cd->x_id = msg->rm_xid;
380 cd->strm_stat = XPRT_DIED; /* XXXX */
385 svctcp_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
387 return ((*xdr_args) (&(((struct tcp_conn *)
388 (xprt->xp_p1))->xdrs), args_ptr));
392 svctcp_freeargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
394 XDR *xdrs = &(((struct tcp_conn *) (xprt->xp_p1))->xdrs);
396 xdrs->x_op = XDR_FREE;
397 return ((*xdr_args) (xdrs, args_ptr));
401 svctcp_reply (SVCXPRT *xprt, struct rpc_msg *msg)
403 struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
404 XDR *xdrs = &(cd->xdrs);
407 xdrs->x_op = XDR_ENCODE;
408 msg->rm_xid = cd->x_id;
409 stat = INTUSE(xdr_replymsg) (xdrs, msg);
410 (void) INTUSE(xdrrec_endofrecord) (xdrs, TRUE);