420 lines
10 KiB
C
420 lines
10 KiB
C
/* @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
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#endif
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/*
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* svc_tcp.c, Server side for TCP/IP based RPC.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* Actually implements two flavors of transporter -
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* a tcp rendezvouser (a listner and connection establisher)
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* and a record/tcp stream.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <rpc/rpc.h>
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#include <sys/socket.h>
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#include <errno.h>
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extern errno;
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/*
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* Ops vector for TCP/IP based rpc service handle
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*/
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static bool_t svctcp_recv();
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static enum xprt_stat svctcp_stat();
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static bool_t svctcp_getargs();
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static bool_t svctcp_reply();
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static bool_t svctcp_freeargs();
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static void svctcp_destroy();
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static struct xp_ops svctcp_op = {
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svctcp_recv,
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svctcp_stat,
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svctcp_getargs,
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svctcp_reply,
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svctcp_freeargs,
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svctcp_destroy
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};
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/*
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* Ops vector for TCP/IP rendezvous handler
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*/
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static bool_t rendezvous_request();
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static enum xprt_stat rendezvous_stat();
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static struct xp_ops svctcp_rendezvous_op = {
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rendezvous_request,
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rendezvous_stat,
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(bool_t (*)())abort,
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(bool_t (*)())abort,
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(bool_t (*)())abort,
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svctcp_destroy
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};
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static int readtcp(), writetcp();
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static SVCXPRT *makefd_xprt();
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struct tcp_rendezvous { /* kept in xprt->xp_p1 */
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u_int sendsize;
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u_int recvsize;
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};
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struct tcp_conn { /* kept in xprt->xp_p1 */
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enum xprt_stat strm_stat;
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u_long x_id;
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XDR xdrs;
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char verf_body[MAX_AUTH_BYTES];
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};
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/*
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* Usage:
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* xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
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*
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* Creates, registers, and returns a (rpc) tcp based transporter.
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* Once *xprt is initialized, it is registered as a transporter
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* see (svc.h, xprt_register). This routine returns
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* a NULL if a problem occurred.
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*
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* If sock<0 then a socket is created, else sock is used.
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* If the socket, sock is not bound to a port then svctcp_create
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* binds it to an arbitrary port. The routine then starts a tcp
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* listener on the socket's associated port. In any (successful) case,
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* xprt->xp_sock is the registered socket number and xprt->xp_port is the
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* associated port number.
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*
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* Since tcp streams do buffered io similar to stdio, the caller can specify
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* how big the send and receive buffers are via the second and third parms;
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* 0 => use the system default.
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*/
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SVCXPRT *
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svctcp_create(sock, sendsize, recvsize)
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register int sock;
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u_int sendsize;
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u_int recvsize;
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{
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bool_t madesock = FALSE;
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register SVCXPRT *xprt;
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register struct tcp_rendezvous *r;
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struct sockaddr_in addr;
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int len = sizeof(struct sockaddr_in);
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if (sock == RPC_ANYSOCK) {
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if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
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perror("svctcp_.c - udp socket creation problem");
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return ((SVCXPRT *)NULL);
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}
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madesock = TRUE;
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}
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bzero((char *)&addr, sizeof (addr));
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addr.sin_family = AF_INET;
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if (bindresvport(sock, &addr)) {
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addr.sin_port = 0;
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(void)bind(sock, (struct sockaddr *)&addr, len);
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}
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if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
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(listen(sock, 2) != 0)) {
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perror("svctcp_.c - cannot getsockname or listen");
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if (madesock)
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(void)close(sock);
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return ((SVCXPRT *)NULL);
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}
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r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
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if (r == NULL) {
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(void) fprintf(stderr, "svctcp_create: out of memory\n");
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return (NULL);
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}
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r->sendsize = sendsize;
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r->recvsize = recvsize;
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xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
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if (xprt == NULL) {
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(void) fprintf(stderr, "svctcp_create: out of memory\n");
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return (NULL);
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}
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xprt->xp_p2 = NULL;
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xprt->xp_p1 = (caddr_t)r;
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xprt->xp_verf = _null_auth;
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xprt->xp_ops = &svctcp_rendezvous_op;
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xprt->xp_port = ntohs(addr.sin_port);
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xprt->xp_sock = sock;
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xprt_register(xprt);
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return (xprt);
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}
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/*
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* Like svtcp_create(), except the routine takes any *open* UNIX file
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* descriptor as its first input.
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*/
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SVCXPRT *
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svcfd_create(fd, sendsize, recvsize)
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int fd;
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u_int sendsize;
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u_int recvsize;
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{
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return (makefd_xprt(fd, sendsize, recvsize));
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}
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static SVCXPRT *
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makefd_xprt(fd, sendsize, recvsize)
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int fd;
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u_int sendsize;
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u_int recvsize;
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{
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register SVCXPRT *xprt;
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register struct tcp_conn *cd;
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xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
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if (xprt == (SVCXPRT *)NULL) {
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(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
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goto done;
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}
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cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
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if (cd == (struct tcp_conn *)NULL) {
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(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
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mem_free((char *) xprt, sizeof(SVCXPRT));
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xprt = (SVCXPRT *)NULL;
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goto done;
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}
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cd->strm_stat = XPRT_IDLE;
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xdrrec_create(&(cd->xdrs), sendsize, recvsize,
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(caddr_t)xprt, readtcp, writetcp);
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xprt->xp_p2 = NULL;
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xprt->xp_p1 = (caddr_t)cd;
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xprt->xp_verf.oa_base = cd->verf_body;
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xprt->xp_addrlen = 0;
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xprt->xp_ops = &svctcp_op; /* truely deals with calls */
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xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
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xprt->xp_sock = fd;
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xprt_register(xprt);
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done:
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return (xprt);
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}
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static bool_t
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rendezvous_request(xprt)
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register SVCXPRT *xprt;
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{
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int sock;
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struct tcp_rendezvous *r;
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struct sockaddr_in addr;
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int len;
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r = (struct tcp_rendezvous *)xprt->xp_p1;
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again:
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len = sizeof(struct sockaddr_in);
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if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
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&len)) < 0) {
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if (errno == EINTR)
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goto again;
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return (FALSE);
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}
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/*
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* make a new transporter (re-uses xprt)
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*/
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xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
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xprt->xp_raddr = addr;
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xprt->xp_addrlen = len;
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return (FALSE); /* there is never an rpc msg to be processed */
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}
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static enum xprt_stat
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rendezvous_stat()
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{
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return (XPRT_IDLE);
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}
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static void
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svctcp_destroy(xprt)
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register SVCXPRT *xprt;
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{
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register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
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xprt_unregister(xprt);
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(void)close(xprt->xp_sock);
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if (xprt->xp_port != 0) {
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/* a rendezvouser socket */
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xprt->xp_port = 0;
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} else {
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/* an actual connection socket */
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XDR_DESTROY(&(cd->xdrs));
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}
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mem_free((caddr_t)cd, sizeof(struct tcp_conn));
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mem_free((caddr_t)xprt, sizeof(SVCXPRT));
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}
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/*
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* All read operations timeout after 35 seconds.
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* A timeout is fatal for the connection.
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*/
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static struct timeval wait_per_try = { 35, 0 };
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/*
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* reads data from the tcp conection.
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* any error is fatal and the connection is closed.
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* (And a read of zero bytes is a half closed stream => error.)
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*/
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static int
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readtcp(xprt, buf, len)
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register SVCXPRT *xprt;
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caddr_t buf;
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register int len;
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{
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register int sock = xprt->xp_sock;
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#ifdef FD_SETSIZE
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fd_set mask;
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fd_set readfds;
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FD_ZERO(&mask);
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FD_SET(sock, &mask);
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#else
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register int mask = 1 << sock;
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int readfds;
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#endif /* def FD_SETSIZE */
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do {
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readfds = mask;
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if (select(_rpc_dtablesize(), &readfds, (int*)NULL, (int*)NULL,
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&wait_per_try) <= 0) {
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if (errno == EINTR) {
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continue;
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}
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goto fatal_err;
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}
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#ifdef FD_SETSIZE
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} while (!FD_ISSET(sock, &readfds));
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#else
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} while (readfds != mask);
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#endif /* def FD_SETSIZE */
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if ((len = read(sock, buf, len)) > 0) {
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return (len);
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}
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fatal_err:
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((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
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return (-1);
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}
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/*
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* writes data to the tcp connection.
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* Any error is fatal and the connection is closed.
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*/
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static int
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writetcp(xprt, buf, len)
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register SVCXPRT *xprt;
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caddr_t buf;
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int len;
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{
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register int i, cnt;
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for (cnt = len; cnt > 0; cnt -= i, buf += i) {
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if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
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((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
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XPRT_DIED;
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return (-1);
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}
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}
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return (len);
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}
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static enum xprt_stat
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svctcp_stat(xprt)
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SVCXPRT *xprt;
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{
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register struct tcp_conn *cd =
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(struct tcp_conn *)(xprt->xp_p1);
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if (cd->strm_stat == XPRT_DIED)
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return (XPRT_DIED);
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if (! xdrrec_eof(&(cd->xdrs)))
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return (XPRT_MOREREQS);
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return (XPRT_IDLE);
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}
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static bool_t
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svctcp_recv(xprt, msg)
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SVCXPRT *xprt;
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register struct rpc_msg *msg;
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{
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register struct tcp_conn *cd =
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(struct tcp_conn *)(xprt->xp_p1);
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register XDR *xdrs = &(cd->xdrs);
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xdrs->x_op = XDR_DECODE;
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(void)xdrrec_skiprecord(xdrs);
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if (xdr_callmsg(xdrs, msg)) {
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cd->x_id = msg->rm_xid;
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return (TRUE);
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}
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return (FALSE);
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}
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static bool_t
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svctcp_getargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr));
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}
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static bool_t
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svctcp_freeargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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register XDR *xdrs =
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&(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
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xdrs->x_op = XDR_FREE;
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return ((*xdr_args)(xdrs, args_ptr));
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}
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static bool_t
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svctcp_reply(xprt, msg)
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SVCXPRT *xprt;
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register struct rpc_msg *msg;
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{
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register struct tcp_conn *cd =
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(struct tcp_conn *)(xprt->xp_p1);
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register XDR *xdrs = &(cd->xdrs);
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register bool_t stat;
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xdrs->x_op = XDR_ENCODE;
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msg->rm_xid = cd->x_id;
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stat = xdr_replymsg(xdrs, msg);
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(void)xdrrec_endofrecord(xdrs, TRUE);
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return (stat);
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}
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