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 /* 38 * svc_simple.c 39 * Simplified front end to rpc. 40 */ 41 42 /* 43 * This interface creates a virtual listener for all the services 44 * started through rpc_reg(). It listens on the same endpoint for 45 * all the services and then executes the corresponding service 46 * for the given prognum and procnum. 47 */ 48 49 #include "namespace.h" 50 #include "reentrant.h" 51 #include <sys/types.h> 52 #include <rpc/rpc.h> 53 #include <rpc/nettype.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <err.h> 58 #include "un-namespace.h" 59 60 #include "rpc_com.h" 61 #include "mt_misc.h" 62 63 static void universal(struct svc_req *, SVCXPRT *); 64 65 static struct proglst { 66 char *(*p_progname)(char *); 67 rpcprog_t p_prognum; 68 rpcvers_t p_versnum; 69 rpcproc_t p_procnum; 70 SVCXPRT *p_transp; 71 char *p_netid; 72 char *p_xdrbuf; 73 int p_recvsz; 74 xdrproc_t p_inproc, p_outproc; 75 struct proglst *p_nxt; 76 } *proglst; 77 78 static const char rpc_reg_err[] = "%s: %s"; 79 static const char rpc_reg_msg[] = "rpc_reg: "; 80 static const char __reg_err1[] = "can't find appropriate transport"; 81 static const char __reg_err2[] = "can't get protocol info"; 82 static const char __reg_err3[] = "unsupported transport size"; 83 static const char __no_mem_str[] = "out of memory"; 84 85 /* 86 * For simplified, easy to use kind of rpc interfaces. 87 * nettype indicates the type of transport on which the service will be 88 * listening. Used for conservation of the system resource. Only one 89 * handle is created for all the services (actually one of each netid) 90 * and same xdrbuf is used for same netid. The size of the arguments 91 * is also limited by the recvsize for that transport, even if it is 92 * a COTS transport. This may be wrong, but for cases like these, they 93 * should not use the simplified interfaces like this. 94 * 95 * prognum - program number 96 * versnum - version number 97 * procnum - procedure number 98 * progname - Server routine 99 * inproc, outproc - in/out XDR procedures 100 * nettype - nettype 101 */ 102 int 103 rpc_reg(rpcprog_t prognum, rpcvers_t versnum, rpcproc_t procnum, 104 char *(*progname)(char *), xdrproc_t inproc, xdrproc_t outproc, 105 char *nettype) 106 { 107 struct netconfig *nconf; 108 int done = FALSE; 109 void *handle; 110 111 112 if (procnum == NULLPROC) { 113 warnx("%s can't reassign procedure number %u", rpc_reg_msg, 114 NULLPROC); 115 return (-1); 116 } 117 118 if (nettype == NULL) 119 nettype = "netpath"; /* The default behavior */ 120 if ((handle = __rpc_setconf(nettype)) == NULL) { 121 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); 122 return (-1); 123 } 124 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 125 mutex_lock(&proglst_lock); 126 while ((nconf = __rpc_getconf(handle)) != NULL) { 127 struct proglst *pl; 128 SVCXPRT *svcxprt; 129 int madenow; 130 u_int recvsz; 131 char *xdrbuf; 132 char *netid; 133 134 madenow = FALSE; 135 svcxprt = NULL; 136 recvsz = 0; 137 xdrbuf = netid = NULL; 138 for (pl = proglst; pl; pl = pl->p_nxt) { 139 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 140 svcxprt = pl->p_transp; 141 xdrbuf = pl->p_xdrbuf; 142 recvsz = pl->p_recvsz; 143 netid = pl->p_netid; 144 break; 145 } 146 } 147 148 if (svcxprt == NULL) { 149 struct __rpc_sockinfo si; 150 151 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 152 if (svcxprt == NULL) 153 continue; 154 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 155 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2); 156 SVC_DESTROY(svcxprt); 157 continue; 158 } 159 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 160 if (recvsz == 0) { 161 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3); 162 SVC_DESTROY(svcxprt); 163 continue; 164 } 165 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) || 166 ((netid = strdup(nconf->nc_netid)) == NULL)) { 167 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 168 free(xdrbuf); 169 free(netid); 170 SVC_DESTROY(svcxprt); 171 break; 172 } 173 madenow = TRUE; 174 } 175 /* 176 * Check if this (program, version, netid) had already been 177 * registered. The check may save a few RPC calls to rpcbind 178 */ 179 for (pl = proglst; pl; pl = pl->p_nxt) 180 if ((pl->p_prognum == prognum) && 181 (pl->p_versnum == versnum) && 182 (strcmp(pl->p_netid, netid) == 0)) 183 break; 184 if (pl == NULL) { /* Not yet */ 185 (void) rpcb_unset(prognum, versnum, nconf); 186 } else { 187 /* so that svc_reg does not call rpcb_set() */ 188 nconf = NULL; 189 } 190 191 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 192 warnx("%s couldn't register prog %u vers %u for %s", 193 rpc_reg_msg, (unsigned)prognum, 194 (unsigned)versnum, netid); 195 if (madenow) { 196 SVC_DESTROY(svcxprt); 197 free(xdrbuf); 198 free(netid); 199 } 200 continue; 201 } 202 203 pl = malloc(sizeof (struct proglst)); 204 if (pl == NULL) { 205 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 206 if (madenow) { 207 SVC_DESTROY(svcxprt); 208 free(xdrbuf); 209 free(netid); 210 } 211 break; 212 } 213 pl->p_progname = progname; 214 pl->p_prognum = prognum; 215 pl->p_versnum = versnum; 216 pl->p_procnum = procnum; 217 pl->p_inproc = inproc; 218 pl->p_outproc = outproc; 219 pl->p_transp = svcxprt; 220 pl->p_xdrbuf = xdrbuf; 221 pl->p_recvsz = recvsz; 222 pl->p_netid = netid; 223 pl->p_nxt = proglst; 224 proglst = pl; 225 done = TRUE; 226 } 227 __rpc_endconf(handle); 228 mutex_unlock(&proglst_lock); 229 230 if (done == FALSE) { 231 warnx("%s can't find suitable transport for %s", 232 rpc_reg_msg, nettype); 233 return (-1); 234 } 235 return (0); 236 } 237 238 /* 239 * The universal handler for the services registered using registerrpc. 240 * It handles both the connectionless and the connection oriented cases. 241 */ 242 243 static void 244 universal(struct svc_req *rqstp, SVCXPRT *transp) 245 { 246 rpcprog_t prog; 247 rpcvers_t vers; 248 rpcproc_t proc; 249 char *outdata; 250 char *xdrbuf; 251 struct proglst *pl; 252 253 /* 254 * enforce "procnum 0 is echo" convention 255 */ 256 if (rqstp->rq_proc == NULLPROC) { 257 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 258 FALSE) { 259 warnx("svc_sendreply failed"); 260 } 261 return; 262 } 263 prog = rqstp->rq_prog; 264 vers = rqstp->rq_vers; 265 proc = rqstp->rq_proc; 266 mutex_lock(&proglst_lock); 267 for (pl = proglst; pl; pl = pl->p_nxt) 268 if (pl->p_prognum == prog && pl->p_procnum == proc && 269 pl->p_versnum == vers && 270 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 271 /* decode arguments into a CLEAN buffer */ 272 xdrbuf = pl->p_xdrbuf; 273 /* Zero the arguments: reqd ! */ 274 (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz); 275 /* 276 * Assuming that sizeof (xdrbuf) would be enough 277 * for the arguments; if not then the program 278 * may bomb. BEWARE! 279 */ 280 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 281 svcerr_decode(transp); 282 mutex_unlock(&proglst_lock); 283 return; 284 } 285 outdata = (*(pl->p_progname))(xdrbuf); 286 if (outdata == NULL && 287 pl->p_outproc != (xdrproc_t) xdr_void){ 288 /* there was an error */ 289 mutex_unlock(&proglst_lock); 290 return; 291 } 292 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 293 warnx( 294 "rpc: rpc_reg trouble replying to prog %u vers %u", 295 (unsigned)prog, (unsigned)vers); 296 mutex_unlock(&proglst_lock); 297 return; 298 } 299 /* free the decoded arguments */ 300 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf); 301 mutex_unlock(&proglst_lock); 302 return; 303 } 304 mutex_unlock(&proglst_lock); 305 /* This should never happen */ 306 warnx("rpc: rpc_reg: never registered prog %u vers %u", 307 (unsigned)prog, (unsigned)vers); 308 return; 309 } 310