svc_tcp.c
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上传日期:2007-01-17
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- /* svc_tcp.c - server side for TCP/IP based RPC */
- /* Copyright 1984-2002 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- * Copyright (C) 1984, Sun Microsystems, Inc.
- *
- * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
- * unrestricted use provided that this legend is included on all tape
- * media and as a part of the software program in whole or part. Users
- * may copy or modify Sun RPC without charge, but are not authorized
- * to license or distribute it to anyone else except as part of a product or
- * program developed by the user.
- *
- * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
- * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
- *
- * Sun RPC is provided with no support and without any obligation on the
- * part of Sun Microsystems, Inc. to assist in its use, correction,
- * modification or enhancement.
- *
- * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
- * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
- * OR ANY PART THEREOF.
- *
- * In no event will Sun Microsystems, Inc. be liable for any lost revenue
- * or profits or other special, indirect and consequential damages, even if
- * Sun has been advised of the possibility of such damages.
- *
- * Sun Microsystems, Inc.
- * 2550 Garcia Avenue
- * Mountain View, California 94043
- */
- /*
- modification history
- --------------------
- 01o,11jan02,vvv fixed infinite loop in readtcp when select times out
- (SPR #67857)
- 01n,05nov01,vvv fixed compilation warnings
- 01m,18apr00,ham fixed compilation warnings.
- 01l,11aug93,jmm Changed ioctl.h and socket.h to sys/ioctl.h and sys/socket.h
- 01k,26may92,rrr the tree shuffle
- -changed includes to have absolute path from h/
- 01j,04oct91,rrr passed through the ansification filter
- -changed includes to have absolute path from h/
- -changed VOID to void
- -changed copyright notice
- 01i,25oct90,dnw removed include of utime.h.
- 01h,07oct90,hjb deleted declaration of mem_alloc() due to problems with
- ISI cpp complaining about macro argument. Added include
- of "memLib.h" instead.
- 01g,19jul90,dnw changed declaration of mem_alloc() from char* to void*
- 01f,10may90,dnw changed to use rpcErrnoGet instead of errnoGet
- 01e,19apr90,hjb de-linted.
- 01d,27oct89,hjb upgraded to 4.0
- 01d,30may88,dnw changed to v4 names.
- 01c,05apr88,gae updated select() to BSD4.3, i.e. used "fd_set".
- changed fprintf() to printErr().
- 01b,11nov87,jlf added wrs copyright, title, mod history, etc.
- 01a,01nov87,rdc first VxWorks version
- */
- #ifndef lint
- /* static char sccsid[] = "@(#)svc_tcp.c 1.1 86/02/03 Copyr 1984 Sun Micro"; */
- #endif
- /*
- * svc_tcp.c, Server side for TCP/IP based RPC.
- *
- * Actually implements two flavors of transporter -
- * a tcp rendezvouser (a listner and connection establisher)
- * and a record/tcp stream.
- */
- #include "rpc/rpctypes.h"
- #include "netinet/in.h"
- #include "sys/socket.h"
- #include "errno.h"
- #include "errnoLib.h"
- #include "rpc/xdr.h"
- #include "rpc/auth.h"
- #include "rpc/clnt.h"
- #include "rpc/rpc_msg.h"
- #include "rpc/svc.h"
- #include "vxWorks.h"
- #include "memLib.h"
- #include "stdio.h"
- #include "sockLib.h"
- #include "ioLib.h"
- #include "rpcLib.h"
- #include "remLib.h"
- extern bool_t abort();
- /*
- * Including stdlib.h causes conflict with abort() declaration, so adding
- * externs for malloc and free
- */
- extern void *malloc ();
- extern void free ();
- /*
- * Ops vector for TCP/IP based rpc service handle
- */
- LOCAL bool_t svctcp_recv();
- LOCAL enum xprt_stat svctcp_stat();
- LOCAL bool_t svctcp_getargs();
- LOCAL bool_t svctcp_reply();
- LOCAL bool_t svctcp_freeargs();
- LOCAL void svctcp_destroy();
- static struct xp_ops svctcp_op = {
- svctcp_recv,
- svctcp_stat,
- svctcp_getargs,
- svctcp_reply,
- svctcp_freeargs,
- svctcp_destroy
- };
- /*
- * Ops vector for TCP/IP rendezvous handler
- */
- LOCAL bool_t rendezvous_request();
- LOCAL enum xprt_stat rendezvous_stat();
- static struct xp_ops svctcp_rendezvous_op = {
- rendezvous_request,
- rendezvous_stat,
- abort,
- abort,
- abort,
- svctcp_destroy
- };
- LOCAL int readtcp();
- LOCAL int writetcp();
- LOCAL SVCXPRT * makefd_xprt();
- struct tcp_rendezvous { /* kept in xprt->xp_p1 */
- u_int sendsize;
- u_int recvsize;
- };
- struct tcp_conn { /* kept in xprt->xp_p1 */
- enum xprt_stat strm_stat;
- u_long x_id;
- XDR xdrs;
- char verf_body[MAX_AUTH_BYTES];
- };
- /*
- * Usage:
- * xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
- *
- * Creates, registers, and returns a (rpc) tcp based transporter.
- * Once *xprt is initialized, it is registered as a transporter
- * see (svc.h, xprt_register). This routine returns
- * a NULL if a problem occurred.
- *
- * If sock<0 then a socket is created, else sock is used.
- * If the socket, sock is not bound to a port then svctcp_create
- * binds it to an arbitrary port. The routine then starts a tcp
- * listener on the socket's associated port. In any (successful) case,
- * xprt->xp_sock is the registered socket number and xprt->xp_port is the
- * associated port number.
- *
- * Since tcp streams do buffered io similar to stdio, the caller can specify
- * how big the send and receive buffers are via the second and third parms;
- * 0 => use the system default.
- */
- SVCXPRT *
- svctcp_create(sock, sendsize, recvsize)
- register int sock;
- u_int sendsize;
- u_int recvsize;
- {
- bool_t madesock = FALSE;
- register SVCXPRT *xprt;
- register struct tcp_rendezvous *r;
- struct sockaddr_in addr;
- int len = sizeof(struct sockaddr_in);
- if (sock == RPC_ANYSOCK) {
- if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
- perror("svctcp_.c - udp socket creation problem");
- return ((SVCXPRT *)NULL);
- }
- madesock = TRUE;
- }
- bzero ((char *) &addr, sizeof (addr)); /* 4.0 */
- addr.sin_family = AF_INET;
- if (bindresvport (sock, &addr)) /* 4.0 */
- { /* 4.0 */
- addr.sin_port = 0; /* 4.0 */
- (void) bind (sock, (struct sockaddr *)&addr, len); /* 4.0 */
- } /* 4.0 */
- if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
- (listen(sock, 2) != 0)) {
- perror("svctcp_.c - cannot getsockname or listen");
- if (madesock)
- (void)close(sock);
- return ((SVCXPRT *)NULL);
- }
- r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
- if (r == NULL) {
- printErr ("svctcp_create: out of memoryn");
- return (NULL);
- }
- r->sendsize = sendsize;
- r->recvsize = recvsize;
- xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
- if (xprt == NULL) {
- printErr ("svctcp_create: out of memoryn");
- return (NULL);
- }
- xprt->xp_p2 = NULL;
- xprt->xp_p1 = (caddr_t)r;
- xprt->xp_verf = _null_auth;
- xprt->xp_ops = &svctcp_rendezvous_op;
- xprt->xp_port = ntohs(addr.sin_port);
- xprt->xp_sock = sock;
- xprt_register(xprt);
- return (xprt);
- }
- /*
- * Like svtcp_create(), except the routine takes any *open* UNIX file
- * descriptor as its first input.
- */
- SVCXPRT *
- svcfd_create(fd, sendsize, recvsize)
- int fd;
- u_int sendsize;
- u_int recvsize;
- {
- return (makefd_xprt(fd, sendsize, recvsize));
- }
- LOCAL SVCXPRT * /* 4.0 */
- makefd_xprt(fd, sendsize, recvsize)
- int fd;
- u_int sendsize;
- u_int recvsize;
- {
- register SVCXPRT *xprt;
- register struct tcp_conn *cd;
- xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
- if (xprt == (SVCXPRT *)NULL) {
- printErr ("svc_tcp: makefd_xprt: out of memoryn");
- goto done;
- }
- cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
- if (cd == (struct tcp_conn *)NULL) {
- printErr ("svc_tcp: makefd_xprt: out of memoryn");
- mem_free((char *) xprt, sizeof(SVCXPRT));
- xprt = (SVCXPRT *)NULL;
- goto done;
- }
- cd->strm_stat = XPRT_IDLE;
- xdrrec_create(&(cd->xdrs), sendsize, recvsize,
- (caddr_t)xprt, readtcp, writetcp);
- xprt->xp_p2 = NULL;
- xprt->xp_p1 = (caddr_t)cd;
- xprt->xp_verf.oa_base = cd->verf_body;
- xprt->xp_addrlen = 0;
- xprt->xp_ops = &svctcp_op; /* truely deals with calls */
- xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
- xprt->xp_sock = fd;
- xprt_register(xprt);
- done:
- return (xprt);
- }
- LOCAL bool_t /* 4.0 */
- rendezvous_request(xprt)
- register SVCXPRT *xprt;
- {
- int sock;
- struct tcp_rendezvous *r;
- struct sockaddr_in addr;
- int len;
- r = (struct tcp_rendezvous *)xprt->xp_p1;
- again:
- len = sizeof(struct sockaddr_in);
- if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
- &len)) < 0) {
- if (rpcErrnoGet () == EINTR)
- goto again;
- return (FALSE);
- }
- /*
- * make a new transporter (re-uses xprt)
- */
- xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
- xprt->xp_raddr = addr;
- xprt->xp_addrlen = len;
- return (FALSE); /* there is never an rpc msg to be processed */
- }
- LOCAL enum xprt_stat /* 4.0 */
- rendezvous_stat()
- {
- return (XPRT_IDLE);
- }
- LOCAL void /* 4.0 */
- svctcp_destroy(xprt)
- register SVCXPRT *xprt;
- {
- register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
- xprt_unregister(xprt);
- (void)close(xprt->xp_sock);
- if (xprt->xp_port != 0) {
- /* a rendezvouser socket */
- xprt->xp_port = 0;
- } else {
- /* an actual connection socket */
- XDR_DESTROY(&(cd->xdrs));
- }
- mem_free((caddr_t)cd, sizeof(struct tcp_conn));
- mem_free((caddr_t)xprt, sizeof(SVCXPRT));
- }
- /*
- * All read operations timeout after 35 seconds.
- * A timeout is fatal for the connection.
- */
- static struct timeval wait_per_try = { 35, 0 };
- /*
- * reads data from the tcp conection.
- * any error is fatal and the connection is closed.
- * (And a read of zero bytes is a half closed stream => error.)
- */
- LOCAL int /* 4.0 */
- readtcp(xprt, buf, len)
- register SVCXPRT *xprt;
- caddr_t buf;
- register int len;
- {
- register int sock = xprt->xp_sock;
- fd_set mask; /* 4.0 */
- fd_set readFds;
- FD_ZERO (&mask); /* 4.0 */
- FD_SET (sock, &mask); /* 4.0 */
- do {
- readFds = mask; /* 4.0 */
- if (select (FD_SETSIZE, &readFds, (fd_set *)NULL,
- (fd_set *)NULL, &wait_per_try) <= 0) {
- if (errnoGet () == EINTR)
- continue;
- goto fatal_err;
- }
- } while (!FD_ISSET (sock, &readFds));
- if ((len = read(sock, buf, len)) > 0)
- return (len);
- fatal_err:
- ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
- return (-1);
- }
- /*
- * writes data to the tcp connection.
- * Any error is fatal and the connection is closed.
- */
- LOCAL int /* 4.0 */
- writetcp(xprt, buf, len)
- register SVCXPRT *xprt;
- caddr_t buf;
- int len;
- {
- register int i, cnt;
- for (cnt = len; cnt > 0; cnt -= i, buf += i) {
- if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
- ((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
- XPRT_DIED;
- return (-1);
- }
- }
- return (len);
- }
- LOCAL enum xprt_stat /* 4.0 */
- svctcp_stat(xprt)
- SVCXPRT *xprt;
- {
- register struct tcp_conn *cd =
- (struct tcp_conn *)(xprt->xp_p1);
- if (cd->strm_stat == XPRT_DIED)
- return (XPRT_DIED);
- if (! xdrrec_eof(&(cd->xdrs)))
- return (XPRT_MOREREQS);
- return (XPRT_IDLE);
- }
- LOCAL bool_t /* 4.0 */
- svctcp_recv(xprt, msg)
- SVCXPRT *xprt;
- register struct rpc_msg *msg;
- {
- register struct tcp_conn *cd =
- (struct tcp_conn *)(xprt->xp_p1);
- register XDR *xdrs = &(cd->xdrs);
- xdrs->x_op = XDR_DECODE;
- (void)xdrrec_skiprecord(xdrs);
- if (xdr_callmsg(xdrs, msg)) {
- cd->x_id = msg->rm_xid;
- return (TRUE);
- }
- return (FALSE);
- }
- LOCAL bool_t /* 4.0 */
- svctcp_getargs(xprt, xdr_args, args_ptr)
- SVCXPRT *xprt;
- xdrproc_t xdr_args;
- caddr_t args_ptr;
- {
- return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr));
- }
- LOCAL bool_t /* 4.0 */
- svctcp_freeargs(xprt, xdr_args, args_ptr)
- SVCXPRT *xprt;
- xdrproc_t xdr_args;
- caddr_t args_ptr;
- {
- register XDR *xdrs =
- &(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
- xdrs->x_op = XDR_FREE;
- return ((*xdr_args)(xdrs, args_ptr));
- }
- LOCAL bool_t /* 4.0 */
- svctcp_reply(xprt, msg)
- SVCXPRT *xprt;
- register struct rpc_msg *msg;
- {
- register struct tcp_conn *cd =
- (struct tcp_conn *)(xprt->xp_p1);
- register XDR *xdrs = &(cd->xdrs);
- register bool_t stat;
- xdrs->x_op = XDR_ENCODE;
- msg->rm_xid = cd->x_id;
- stat = xdr_replymsg(xdrs, msg);
- (void)xdrrec_endofrecord(xdrs, TRUE);
- return (stat);
- }