svc_simple.c revision 1.32
1 /* $NetBSD: svc_simple.c,v 1.32 2013/03/04 17:17:56 christos Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 /* 32 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 33 */ 34 35 /* #pragma ident "@(#)svc_simple.c 1.18 94/04/24 SMI" */ 36 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 thru 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 <sys/cdefs.h> 50 #if defined(LIBC_SCCS) && !defined(lint) 51 __RCSID("$NetBSD: svc_simple.c,v 1.32 2013/03/04 17:17:56 christos Exp $"); 52 #endif 53 54 #include "namespace.h" 55 #include "reentrant.h" 56 #include <sys/types.h> 57 #include <rpc/rpc.h> 58 #include <rpc/nettype.h> 59 #include <assert.h> 60 #include <err.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 65 #include "rpc_internal.h" 66 67 #ifdef __weak_alias 68 __weak_alias(rpc_reg,_rpc_reg) 69 #endif 70 71 static void universal(struct svc_req *, SVCXPRT *); 72 73 static struct proglst { 74 char *(*p_progname)(char *); 75 rpcprog_t p_prognum; 76 rpcvers_t p_versnum; 77 rpcproc_t p_procnum; 78 SVCXPRT *p_transp; 79 char *p_netid; 80 char *p_xdrbuf; 81 int p_recvsz; 82 xdrproc_t p_inproc, p_outproc; 83 struct proglst *p_nxt; 84 } *proglst; 85 86 static const char __reg_err1[] = "can't find appropriate transport"; 87 static const char __reg_err2[] = "can't get protocol info"; 88 static const char __reg_err3[] = "unsupported transport size"; 89 static const char __no_mem_str[] = "out of memory"; 90 91 /* 92 * For simplified, easy to use kind of rpc interfaces. 93 * nettype indicates the type of transport on which the service will be 94 * listening. Used for conservation of the system resource. Only one 95 * handle is created for all the services (actually one of each netid) 96 * and same xdrbuf is used for same netid. The size of the arguments 97 * is also limited by the recvsize for that transport, even if it is 98 * a COTS transport. This may be wrong, but for cases like these, they 99 * should not use the simplified interfaces like this. 100 */ 101 102 int 103 rpc_reg( 104 rpcprog_t prognum, /* program number */ 105 rpcvers_t versnum, /* version number */ 106 rpcproc_t procnum, /* procedure number */ 107 char *(*progname)(char *), /* Server routine */ 108 xdrproc_t inproc, /* in XDR procedure */ 109 xdrproc_t outproc, /* out XDR procedure */ 110 char *nettype) /* nettype */ 111 { 112 struct netconfig *nconf; 113 int done = FALSE; 114 void *handle; 115 #ifdef _REENTRANT 116 extern mutex_t proglst_lock; 117 #endif 118 119 if (procnum == NULLPROC) { 120 warnx("%s: can't reassign procedure number %u", __func__, 121 NULLPROC); 122 return (-1); 123 } 124 125 if (nettype == NULL) 126 nettype = __UNCONST("netpath"); /* The default behavior */ 127 if ((handle = __rpc_setconf(nettype)) == NULL) { 128 warnx("%s: %s", __func__, __reg_err1); 129 return (-1); 130 } 131 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 132 mutex_lock(&proglst_lock); 133 while ((nconf = __rpc_getconf(handle)) != NULL) { 134 struct proglst *pl; 135 SVCXPRT *svcxprt; 136 int madenow; 137 u_int recvsz; 138 char *xdrbuf; 139 char *netid; 140 141 madenow = FALSE; 142 svcxprt = NULL; 143 recvsz = 0; 144 xdrbuf = NULL; 145 netid = NULL; 146 for (pl = proglst; pl; pl = pl->p_nxt) 147 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 148 svcxprt = pl->p_transp; 149 xdrbuf = pl->p_xdrbuf; 150 recvsz = pl->p_recvsz; 151 netid = pl->p_netid; 152 break; 153 } 154 155 if (svcxprt == NULL) { 156 struct __rpc_sockinfo si; 157 158 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 159 if (svcxprt == NULL) 160 continue; 161 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 162 warnx("%s: %s", __func__, __reg_err2); 163 SVC_DESTROY(svcxprt); 164 continue; 165 } 166 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 167 if (recvsz == 0) { 168 warnx("%s: %s", __func__, __reg_err3); 169 SVC_DESTROY(svcxprt); 170 continue; 171 } 172 if (((xdrbuf = mem_alloc((size_t)recvsz)) == NULL) || 173 ((netid = strdup(nconf->nc_netid)) == NULL)) { 174 warnx("%s: %s", __func__, __no_mem_str); 175 if (xdrbuf != NULL) 176 free(xdrbuf); 177 if (netid != NULL) 178 free(netid); 179 SVC_DESTROY(svcxprt); 180 break; 181 } 182 madenow = TRUE; 183 } 184 /* 185 * Check if this (program, version, netid) had already been 186 * registered. The check may save a few RPC calls to rpcbind 187 */ 188 for (pl = proglst; pl; pl = pl->p_nxt) 189 if ((pl->p_prognum == prognum) && 190 (pl->p_versnum == versnum) && 191 (strcmp(pl->p_netid, netid) == 0)) 192 break; 193 if (pl == NULL) { /* Not yet */ 194 (void) rpcb_unset(prognum, versnum, nconf); 195 } else { 196 /* so that svc_reg does not call rpcb_set() */ 197 nconf = NULL; 198 } 199 200 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 201 warnx("%s: couldn't register prog %u vers %u for %s", 202 __func__, (unsigned)prognum, 203 (unsigned)versnum, netid); 204 if (madenow) { 205 SVC_DESTROY(svcxprt); 206 free(xdrbuf); 207 free(netid); 208 } 209 continue; 210 } 211 212 pl = malloc(sizeof(*pl)); 213 if (pl == NULL) { 214 warn("%s: %s", __func__, __no_mem_str); 215 if (madenow) { 216 SVC_DESTROY(svcxprt); 217 free(xdrbuf); 218 free(netid); 219 } 220 break; 221 } 222 pl->p_progname = progname; 223 pl->p_prognum = prognum; 224 pl->p_versnum = versnum; 225 pl->p_procnum = procnum; 226 pl->p_inproc = inproc; 227 pl->p_outproc = outproc; 228 pl->p_transp = svcxprt; 229 pl->p_xdrbuf = xdrbuf; 230 pl->p_recvsz = recvsz; 231 pl->p_netid = netid; 232 pl->p_nxt = proglst; 233 proglst = pl; 234 done = TRUE; 235 } 236 __rpc_endconf(handle); 237 mutex_unlock(&proglst_lock); 238 239 if (done == FALSE) { 240 warnx("%s: can't find suitable transport for %s", 241 __func__, nettype); 242 return (-1); 243 } 244 return (0); 245 } 246 247 /* 248 * The universal handler for the services registered using registerrpc. 249 * It handles both the connectionless and the connection oriented cases. 250 */ 251 252 static void 253 universal(struct svc_req *rqstp, SVCXPRT *transp) 254 { 255 rpcprog_t prog; 256 rpcvers_t vers; 257 rpcproc_t proc; 258 char *outdata; 259 char *xdrbuf; 260 struct proglst *pl; 261 #ifdef _REENTRANT 262 extern mutex_t proglst_lock; 263 #endif 264 265 _DIAGASSERT(rqstp != NULL); 266 _DIAGASSERT(transp != NULL); 267 268 /* 269 * enforce "procnum 0 is echo" convention 270 */ 271 if (rqstp->rq_proc == NULLPROC) { 272 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 273 FALSE) { 274 warnx("%s: svc_sendreply failed", __func__); 275 } 276 return; 277 } 278 prog = rqstp->rq_prog; 279 vers = rqstp->rq_vers; 280 proc = rqstp->rq_proc; 281 mutex_lock(&proglst_lock); 282 for (pl = proglst; pl; pl = pl->p_nxt) 283 if (pl->p_prognum == prog && pl->p_procnum == proc && 284 pl->p_versnum == vers && 285 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 286 /* decode arguments into a CLEAN buffer */ 287 xdrbuf = pl->p_xdrbuf; 288 /* Zero the arguments: reqd ! */ 289 (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz); 290 /* 291 * Assuming that sizeof (xdrbuf) would be enough 292 * for the arguments; if not then the program 293 * may bomb. BEWARE! 294 */ 295 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 296 svcerr_decode(transp); 297 mutex_unlock(&proglst_lock); 298 return; 299 } 300 outdata = (*(pl->p_progname))(xdrbuf); 301 if (outdata == NULL && 302 pl->p_outproc != (xdrproc_t) xdr_void){ 303 /* there was an error */ 304 mutex_unlock(&proglst_lock); 305 return; 306 } 307 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 308 warnx("%s: trouble replying to prog %u vers %u", 309 __func__, (unsigned)prog, (unsigned)vers); 310 mutex_unlock(&proglst_lock); 311 return; 312 } 313 /* free the decoded arguments */ 314 (void) svc_freeargs(transp, pl->p_inproc, xdrbuf); 315 mutex_unlock(&proglst_lock); 316 return; 317 } 318 mutex_unlock(&proglst_lock); 319 /* This should never happen */ 320 warnx("%s: never registered prog %u vers %u", __func__, 321 (unsigned)prog, (unsigned)vers); 322 return; 323 } 324
Indexes created Wed Sep 24 15:09:51 GMT 2025