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/* $OpenBSD: svc_simple.c,v 1.11 2010/09/01 14:43:34 millert Exp $ */
/*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the "Oracle America, Inc." nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* svc_simple.c
* Simplified front end to rpc.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <netdb.h>
static struct proglst {
char *(*p_progname)();
int p_prognum;
int p_procnum;
xdrproc_t p_inproc, p_outproc;
struct proglst *p_nxt;
} *proglst;
static void universal(struct svc_req *, SVCXPRT *);
static SVCXPRT *transp;
int
registerrpc(int prognum, int versnum, int procnum, char *(*progname)(),
xdrproc_t inproc, xdrproc_t outproc)
{
struct proglst *pl;
if (procnum == NULLPROC) {
(void) fprintf(stderr,
"can't reassign procedure number %u\n", NULLPROC);
return (-1);
}
if (transp == NULL) {
transp = svcudp_create(RPC_ANYSOCK);
if (transp == NULL) {
(void) fprintf(stderr, "couldn't create an rpc server\n");
return (-1);
}
}
(void) pmap_unset((u_long)prognum, (u_long)versnum);
if (!svc_register(transp, (u_long)prognum, (u_long)versnum,
universal, IPPROTO_UDP)) {
(void) fprintf(stderr, "couldn't register prog %d vers %d\n",
prognum, versnum);
return (-1);
}
pl = (struct proglst *)malloc(sizeof(struct proglst));
if (pl == NULL) {
(void) fprintf(stderr, "registerrpc: out of memory\n");
return (-1);
}
pl->p_progname = progname;
pl->p_prognum = prognum;
pl->p_procnum = procnum;
pl->p_inproc = inproc;
pl->p_outproc = outproc;
pl->p_nxt = proglst;
proglst = pl;
return (0);
}
static void
universal(struct svc_req *rqstp, SVCXPRT *transp)
{
int prog, proc;
char *outdata;
char xdrbuf[UDPMSGSIZE];
struct proglst *pl;
/*
* enforce "procnum 0 is echo" convention
*/
if (rqstp->rq_proc == NULLPROC) {
if (svc_sendreply(transp, xdr_void, NULL) == FALSE) {
(void) fprintf(stderr, "xxx\n");
exit(1);
}
return;
}
prog = rqstp->rq_prog;
proc = rqstp->rq_proc;
for (pl = proglst; pl != NULL; pl = pl->p_nxt)
if (pl->p_prognum == prog && pl->p_procnum == proc) {
/* decode arguments into a CLEAN buffer */
memset(xdrbuf, 0, sizeof(xdrbuf)); /* required ! */
if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) {
svcerr_decode(transp);
return;
}
outdata = (*(pl->p_progname))(xdrbuf);
if (outdata == NULL &&
pl->p_outproc != xdr_void)
/* there was an error */
return;
if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
(void) fprintf(stderr,
"trouble replying to prog %d\n",
pl->p_prognum);
exit(1);
}
/* free the decoded arguments */
(void)svc_freeargs(transp, pl->p_inproc, xdrbuf);
return;
}
(void) fprintf(stderr, "never registered prog %d\n", prog);
exit(1);
}
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