1/* $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 christos Exp $ */ 2 3/*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2009, Sun Microsystems, Inc. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * - Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * - Neither the name of Sun Microsystems, 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 "AS IS" 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32/* 33 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 34 */ 35 36/* #pragma ident "@(#)svc_simple.c 1.18 94/04/24 SMI" */ 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD$"); 39 40/* 41 * svc_simple.c 42 * Simplified front end to rpc. 43 */ 44 45/* 46 * This interface creates a virtual listener for all the services 47 * started through rpc_reg(). It listens on the same endpoint for 48 * all the services and then executes the corresponding service 49 * for the given prognum and procnum. 50 */ 51 52#include "namespace.h" 53#include "reentrant.h" 54#include <sys/types.h> 55#include <rpc/rpc.h> 56#include <rpc/nettype.h> 57#include <stdio.h> 58#include <stdlib.h> 59#include <string.h> 60#include <err.h> 61#include "un-namespace.h" 62 63#include "rpc_com.h" 64#include "mt_misc.h" 65 66static void universal(struct svc_req *, SVCXPRT *); 67 68static struct proglst { 69 char *(*p_progname)(char *); 70 rpcprog_t p_prognum; 71 rpcvers_t p_versnum; 72 rpcproc_t p_procnum; 73 SVCXPRT *p_transp; 74 char *p_netid; 75 char *p_xdrbuf; 76 int p_recvsz; 77 xdrproc_t p_inproc, p_outproc; 78 struct proglst *p_nxt; 79} *proglst; 80 81static const char rpc_reg_err[] = "%s: %s"; 82static const char rpc_reg_msg[] = "rpc_reg: "; 83static const char __reg_err1[] = "can't find appropriate transport"; 84static const char __reg_err2[] = "can't get protocol info"; 85static const char __reg_err3[] = "unsupported transport size"; 86static const char __no_mem_str[] = "out of memory"; 87 88/* 89 * For simplified, easy to use kind of rpc interfaces. 90 * nettype indicates the type of transport on which the service will be 91 * listening. Used for conservation of the system resource. Only one 92 * handle is created for all the services (actually one of each netid) 93 * and same xdrbuf is used for same netid. The size of the arguments 94 * is also limited by the recvsize for that transport, even if it is 95 * a COTS transport. This may be wrong, but for cases like these, they 96 * should not use the simplified interfaces like this. 97 * 98 * prognum - program number 99 * versnum - version number 100 * procnum - procedure number 101 * progname - Server routine 102 * inproc, outproc - in/out XDR procedures 103 * nettype - nettype 104 */ 105int 106rpc_reg(rpcprog_t prognum, rpcvers_t versnum, rpcproc_t procnum, 107 char *(*progname)(char *), xdrproc_t inproc, xdrproc_t outproc, 108 char *nettype) 109{ 110 struct netconfig *nconf; 111 int done = FALSE; 112 void *handle; 113 114 115 if (procnum == NULLPROC) { 116 warnx("%s can't reassign procedure number %u", rpc_reg_msg, 117 NULLPROC); 118 return (-1); 119 } 120 121 if (nettype == NULL) 122 nettype = "netpath"; /* The default behavior */ 123 if ((handle = __rpc_setconf(nettype)) == NULL) { 124 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); 125 return (-1); 126 } 127/* VARIABLES PROTECTED BY proglst_lock: proglst */ 128 mutex_lock(&proglst_lock); 129 while ((nconf = __rpc_getconf(handle)) != NULL) { 130 struct proglst *pl; 131 SVCXPRT *svcxprt; 132 int madenow; 133 u_int recvsz; 134 char *xdrbuf; 135 char *netid; 136 137 madenow = FALSE; 138 svcxprt = NULL; 139 recvsz = 0; 140 xdrbuf = netid = NULL; 141 for (pl = proglst; pl; pl = pl->p_nxt) { 142 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 143 svcxprt = pl->p_transp; 144 xdrbuf = pl->p_xdrbuf; 145 recvsz = pl->p_recvsz; 146 netid = pl->p_netid; 147 break; 148 } 149 } 150 151 if (svcxprt == NULL) { 152 struct __rpc_sockinfo si; 153 154 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 155 if (svcxprt == NULL) 156 continue; 157 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 158 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2); 159 SVC_DESTROY(svcxprt); 160 continue; 161 } 162 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 163 if (recvsz == 0) { 164 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3); 165 SVC_DESTROY(svcxprt); 166 continue; 167 } 168 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) || 169 ((netid = strdup(nconf->nc_netid)) == NULL)) { 170 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 171 free(xdrbuf); 172 free(netid); 173 SVC_DESTROY(svcxprt); 174 break; 175 } 176 madenow = TRUE; 177 } 178 /* 179 * Check if this (program, version, netid) had already been 180 * registered. The check may save a few RPC calls to rpcbind 181 */ 182 for (pl = proglst; pl; pl = pl->p_nxt) 183 if ((pl->p_prognum == prognum) && 184 (pl->p_versnum == versnum) && 185 (strcmp(pl->p_netid, netid) == 0)) 186 break; 187 if (pl == NULL) { /* Not yet */ 188 (void) rpcb_unset(prognum, versnum, nconf); 189 } else { 190 /* so that svc_reg does not call rpcb_set() */ 191 nconf = NULL; 192 } 193 194 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 195 warnx("%s couldn't register prog %u vers %u for %s", 196 rpc_reg_msg, (unsigned)prognum, 197 (unsigned)versnum, netid); 198 if (madenow) { 199 SVC_DESTROY(svcxprt); 200 free(xdrbuf); 201 free(netid); 202 } 203 continue; 204 } 205 206 pl = malloc(sizeof (struct proglst)); 207 if (pl == NULL) { 208 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 209 if (madenow) { 210 SVC_DESTROY(svcxprt); 211 free(xdrbuf); 212 free(netid); 213 } 214 break; 215 } 216 pl->p_progname = progname; 217 pl->p_prognum = prognum; 218 pl->p_versnum = versnum; 219 pl->p_procnum = procnum; 220 pl->p_inproc = inproc; 221 pl->p_outproc = outproc; 222 pl->p_transp = svcxprt; 223 pl->p_xdrbuf = xdrbuf; 224 pl->p_recvsz = recvsz; 225 pl->p_netid = netid; 226 pl->p_nxt = proglst; 227 proglst = pl; 228 done = TRUE; 229 } 230 __rpc_endconf(handle); 231 mutex_unlock(&proglst_lock); 232 233 if (done == FALSE) { 234 warnx("%s can't find suitable transport for %s", 235 rpc_reg_msg, nettype); 236 return (-1); 237 } 238 return (0); 239} 240 241/* 242 * The universal handler for the services registered using registerrpc. 243 * It handles both the connectionless and the connection oriented cases. 244 */ 245 246static void 247universal(struct svc_req *rqstp, SVCXPRT *transp) 248{ 249 rpcprog_t prog; 250 rpcvers_t vers; 251 rpcproc_t proc; 252 char *outdata; 253 char *xdrbuf; 254 struct proglst *pl; 255 256 /* 257 * enforce "procnum 0 is echo" convention 258 */ 259 if (rqstp->rq_proc == NULLPROC) { 260 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 261 FALSE) { 262 warnx("svc_sendreply failed"); 263 } 264 return; 265 } 266 prog = rqstp->rq_prog; 267 vers = rqstp->rq_vers; 268 proc = rqstp->rq_proc; 269 mutex_lock(&proglst_lock); 270 for (pl = proglst; pl; pl = pl->p_nxt) 271 if (pl->p_prognum == prog && pl->p_procnum == proc && 272 pl->p_versnum == vers && 273 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 274 /* decode arguments into a CLEAN buffer */ 275 xdrbuf = pl->p_xdrbuf; 276 /* Zero the arguments: reqd ! */ 277 (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz); 278 /* 279 * Assuming that sizeof (xdrbuf) would be enough 280 * for the arguments; if not then the program 281 * may bomb. BEWARE! 282 */ 283 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 284 svcerr_decode(transp); 285 mutex_unlock(&proglst_lock); 286 return; 287 } 288 outdata = (*(pl->p_progname))(xdrbuf); 289 if (outdata == NULL && 290 pl->p_outproc != (xdrproc_t) xdr_void){ 291 /* there was an error */ 292 mutex_unlock(&proglst_lock); 293 return; 294 } 295 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 296 warnx( 297 "rpc: rpc_reg trouble replying to prog %u vers %u", 298 (unsigned)prog, (unsigned)vers); 299 mutex_unlock(&proglst_lock); 300 return; 301 } 302 /* free the decoded arguments */ 303 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf); 304 mutex_unlock(&proglst_lock); 305 return; 306 } 307 mutex_unlock(&proglst_lock); 308 /* This should never happen */ 309 warnx("rpc: rpc_reg: never registered prog %u vers %u", 310 (unsigned)prog, (unsigned)vers); 311 return; 312} 313