1 /* $OpenBSD: svc_simple.c,v 1.11 2010/09/01 14:43:34 millert Exp $ */ 2 3 /* 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * svc_simple.c 36 * Simplified front end to rpc. 37 */ 38 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <rpc/rpc.h> 43 #include <rpc/pmap_clnt.h> 44 #include <sys/socket.h> 45 #include <netdb.h> 46 47 static struct proglst { 48 char *(*p_progname)(); 49 int p_prognum; 50 int p_procnum; 51 xdrproc_t p_inproc, p_outproc; 52 struct proglst *p_nxt; 53 } *proglst; 54 static void universal(struct svc_req *, SVCXPRT *); 55 static SVCXPRT *transp; 56 57 int 58 registerrpc(int prognum, int versnum, int procnum, char *(*progname)(), 59 xdrproc_t inproc, xdrproc_t outproc) 60 { 61 struct proglst *pl; 62 63 if (procnum == NULLPROC) { 64 (void) fprintf(stderr, 65 "can't reassign procedure number %u\n", NULLPROC); 66 return (-1); 67 } 68 if (transp == NULL) { 69 transp = svcudp_create(RPC_ANYSOCK); 70 if (transp == NULL) { 71 (void) fprintf(stderr, "couldn't create an rpc server\n"); 72 return (-1); 73 } 74 } 75 (void) pmap_unset((u_long)prognum, (u_long)versnum); 76 if (!svc_register(transp, (u_long)prognum, (u_long)versnum, 77 universal, IPPROTO_UDP)) { 78 (void) fprintf(stderr, "couldn't register prog %d vers %d\n", 79 prognum, versnum); 80 return (-1); 81 } 82 pl = (struct proglst *)malloc(sizeof(struct proglst)); 83 if (pl == NULL) { 84 (void) fprintf(stderr, "registerrpc: out of memory\n"); 85 return (-1); 86 } 87 pl->p_progname = progname; 88 pl->p_prognum = prognum; 89 pl->p_procnum = procnum; 90 pl->p_inproc = inproc; 91 pl->p_outproc = outproc; 92 pl->p_nxt = proglst; 93 proglst = pl; 94 return (0); 95 } 96 97 static void 98 universal(struct svc_req *rqstp, SVCXPRT *transp) 99 { 100 int prog, proc; 101 char *outdata; 102 char xdrbuf[UDPMSGSIZE]; 103 struct proglst *pl; 104 105 /* 106 * enforce "procnum 0 is echo" convention 107 */ 108 if (rqstp->rq_proc == NULLPROC) { 109 if (svc_sendreply(transp, xdr_void, NULL) == FALSE) { 110 (void) fprintf(stderr, "xxx\n"); 111 exit(1); 112 } 113 return; 114 } 115 prog = rqstp->rq_prog; 116 proc = rqstp->rq_proc; 117 for (pl = proglst; pl != NULL; pl = pl->p_nxt) 118 if (pl->p_prognum == prog && pl->p_procnum == proc) { 119 /* decode arguments into a CLEAN buffer */ 120 memset(xdrbuf, 0, sizeof(xdrbuf)); /* required ! */ 121 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 122 svcerr_decode(transp); 123 return; 124 } 125 outdata = (*(pl->p_progname))(xdrbuf); 126 if (outdata == NULL && 127 pl->p_outproc != xdr_void) 128 /* there was an error */ 129 return; 130 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 131 (void) fprintf(stderr, 132 "trouble replying to prog %d\n", 133 pl->p_prognum); 134 exit(1); 135 } 136 /* free the decoded arguments */ 137 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf); 138 return; 139 } 140 (void) fprintf(stderr, "never registered prog %d\n", prog); 141 exit(1); 142 } 143 144