1 /* $NetBSD: svc_simple.c,v 1.34 2024/01/23 17:24:38 christos 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 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 35 */ 36 37 /* #pragma ident "@(#)svc_simple.c 1.18 94/04/24 SMI" */ 38 39 /* 40 * svc_simple.c 41 * Simplified front end to rpc. 42 */ 43 44 /* 45 * This interface creates a virtual listener for all the services 46 * started thru rpc_reg(). It listens on the same endpoint for 47 * all the services and then executes the corresponding service 48 * for the given prognum and procnum. 49 */ 50 51 #include <sys/cdefs.h> 52 #if defined(LIBC_SCCS) && !defined(lint) 53 __RCSID("$NetBSD: svc_simple.c,v 1.34 2024/01/23 17:24:38 christos Exp $"); 54 #endif 55 56 #include "namespace.h" 57 #include "reentrant.h" 58 #include <sys/types.h> 59 #include <rpc/rpc.h> 60 #include <rpc/nettype.h> 61 #include <assert.h> 62 #include <err.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 67 #include "rpc_internal.h" 68 69 #ifdef __weak_alias 70 __weak_alias(rpc_reg,_rpc_reg) 71 #endif 72 73 static void universal(struct svc_req *, SVCXPRT *); 74 75 static struct proglst { 76 char *(*p_progname)(char *); 77 rpcprog_t p_prognum; 78 rpcvers_t p_versnum; 79 rpcproc_t p_procnum; 80 SVCXPRT *p_transp; 81 char *p_netid; 82 char *p_xdrbuf; 83 int p_recvsz; 84 xdrproc_t p_inproc, p_outproc; 85 struct proglst *p_nxt; 86 } *proglst; 87 88 static const char __reg_err1[] = "can't find appropriate transport"; 89 static const char __reg_err2[] = "can't get protocol info"; 90 static const char __reg_err3[] = "unsupported transport size"; 91 static const char __no_mem_str[] = "out of memory"; 92 93 /* 94 * For simplified, easy to use kind of rpc interfaces. 95 * nettype indicates the type of transport on which the service will be 96 * listening. Used for conservation of the system resource. Only one 97 * handle is created for all the services (actually one of each netid) 98 * and same xdrbuf is used for same netid. The size of the arguments 99 * is also limited by the recvsize for that transport, even if it is 100 * a COTS transport. This may be wrong, but for cases like these, they 101 * should not use the simplified interfaces like this. 102 */ 103 104 int 105 rpc_reg( 106 rpcprog_t prognum, /* program number */ 107 rpcvers_t versnum, /* version number */ 108 rpcproc_t procnum, /* procedure number */ 109 char *(*progname)(char *), /* Server routine */ 110 xdrproc_t inproc, /* in XDR procedure */ 111 xdrproc_t outproc, /* out XDR procedure */ 112 char *nettype) /* nettype */ 113 { 114 struct netconfig *nconf; 115 int done = FALSE; 116 void *handle; 117 118 if (procnum == NULLPROC) { 119 warnx("%s: can't reassign procedure number %u", __func__, 120 NULLPROC); 121 return (-1); 122 } 123 124 if (nettype == NULL) 125 nettype = __UNCONST("netpath"); /* The default behavior */ 126 if ((handle = __rpc_setconf(nettype)) == NULL) { 127 warnx("%s: %s", __func__, __reg_err1); 128 return (-1); 129 } 130 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 131 mutex_lock(&proglst_lock); 132 while ((nconf = __rpc_getconf(handle)) != NULL) { 133 struct proglst *pl; 134 SVCXPRT *svcxprt; 135 int madenow; 136 u_int recvsz; 137 char *xdrbuf; 138 char *netid; 139 140 madenow = FALSE; 141 svcxprt = NULL; 142 recvsz = 0; 143 xdrbuf = NULL; 144 netid = NULL; 145 for (pl = proglst; pl; pl = pl->p_nxt) 146 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 147 svcxprt = pl->p_transp; 148 xdrbuf = pl->p_xdrbuf; 149 recvsz = pl->p_recvsz; 150 netid = pl->p_netid; 151 break; 152 } 153 154 if (svcxprt == NULL) { 155 struct __rpc_sockinfo si; 156 157 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 158 if (svcxprt == NULL) 159 continue; 160 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 161 warnx("%s: %s", __func__, __reg_err2); 162 SVC_DESTROY(svcxprt); 163 continue; 164 } 165 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 166 if (recvsz == 0) { 167 warnx("%s: %s", __func__, __reg_err3); 168 SVC_DESTROY(svcxprt); 169 continue; 170 } 171 if (((xdrbuf = mem_alloc((size_t)recvsz)) == NULL) || 172 ((netid = strdup(nconf->nc_netid)) == NULL)) { 173 warnx("%s: %s", __func__, __no_mem_str); 174 if (xdrbuf != NULL) 175 free(xdrbuf); 176 if (netid != NULL) 177 free(netid); 178 SVC_DESTROY(svcxprt); 179 break; 180 } 181 madenow = TRUE; 182 } 183 /* 184 * Check if this (program, version, netid) had already been 185 * registered. The check may save a few RPC calls to rpcbind 186 */ 187 for (pl = proglst; pl; pl = pl->p_nxt) 188 if ((pl->p_prognum == prognum) && 189 (pl->p_versnum == versnum) && 190 (strcmp(pl->p_netid, netid) == 0)) 191 break; 192 if (pl == NULL) { /* Not yet */ 193 (void) rpcb_unset(prognum, versnum, nconf); 194 } else { 195 /* so that svc_reg does not call rpcb_set() */ 196 nconf = NULL; 197 } 198 199 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 200 warnx("%s: couldn't register prog %u vers %u for %s", 201 __func__, (unsigned)prognum, 202 (unsigned)versnum, netid); 203 if (madenow) { 204 SVC_DESTROY(svcxprt); 205 free(xdrbuf); 206 free(netid); 207 } 208 continue; 209 } 210 211 pl = malloc(sizeof(*pl)); 212 if (pl == NULL) { 213 warn("%s: %s", __func__, __no_mem_str); 214 if (madenow) { 215 SVC_DESTROY(svcxprt); 216 free(xdrbuf); 217 free(netid); 218 } 219 break; 220 } 221 pl->p_progname = progname; 222 pl->p_prognum = prognum; 223 pl->p_versnum = versnum; 224 pl->p_procnum = procnum; 225 pl->p_inproc = inproc; 226 pl->p_outproc = outproc; 227 pl->p_transp = svcxprt; 228 pl->p_xdrbuf = xdrbuf; 229 pl->p_recvsz = recvsz; 230 pl->p_netid = netid; 231 pl->p_nxt = proglst; 232 proglst = pl; 233 done = TRUE; 234 } 235 __rpc_endconf(handle); 236 mutex_unlock(&proglst_lock); 237 238 if (done == FALSE) { 239 warnx("%s: can't find suitable transport for %s", 240 __func__, nettype); 241 return (-1); 242 } 243 return (0); 244 } 245 246 /* 247 * The universal handler for the services registered using registerrpc. 248 * It handles both the connectionless and the connection oriented cases. 249 */ 250 251 static void 252 universal(struct svc_req *rqstp, SVCXPRT *transp) 253 { 254 rpcprog_t prog; 255 rpcvers_t vers; 256 rpcproc_t proc; 257 char *outdata; 258 char *xdrbuf; 259 struct proglst *pl; 260 261 _DIAGASSERT(rqstp != NULL); 262 _DIAGASSERT(transp != NULL); 263 264 /* 265 * enforce "procnum 0 is echo" convention 266 */ 267 if (rqstp->rq_proc == NULLPROC) { 268 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 269 FALSE) { 270 warnx("%s: svc_sendreply failed", __func__); 271 } 272 return; 273 } 274 prog = rqstp->rq_prog; 275 vers = rqstp->rq_vers; 276 proc = rqstp->rq_proc; 277 mutex_lock(&proglst_lock); 278 for (pl = proglst; pl; pl = pl->p_nxt) 279 if (pl->p_prognum == prog && pl->p_procnum == proc && 280 pl->p_versnum == vers && 281 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 282 /* decode arguments into a CLEAN buffer */ 283 xdrbuf = pl->p_xdrbuf; 284 /* Zero the arguments: reqd ! */ 285 (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz); 286 /* 287 * Assuming that sizeof (xdrbuf) would be enough 288 * for the arguments; if not then the program 289 * may bomb. BEWARE! 290 */ 291 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 292 svcerr_decode(transp); 293 mutex_unlock(&proglst_lock); 294 return; 295 } 296 outdata = (*(pl->p_progname))(xdrbuf); 297 if (outdata == NULL && 298 pl->p_outproc != (xdrproc_t) xdr_void){ 299 /* there was an error */ 300 mutex_unlock(&proglst_lock); 301 return; 302 } 303 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 304 warnx("%s: trouble replying to prog %u vers %u", 305 __func__, (unsigned)prog, (unsigned)vers); 306 mutex_unlock(&proglst_lock); 307 return; 308 } 309 /* free the decoded arguments */ 310 (void) svc_freeargs(transp, pl->p_inproc, xdrbuf); 311 mutex_unlock(&proglst_lock); 312 return; 313 } 314 mutex_unlock(&proglst_lock); 315 /* This should never happen */ 316 warnx("%s: never registered prog %u vers %u", __func__, 317 (unsigned)prog, (unsigned)vers); 318 return; 319 } 320
Indexes created Sat Sep 20 22:09:52 GMT 2025