svc_simple.c revision 1.31
1 /* $NetBSD: svc_simple.c,v 1.31 2012/03/20 17:14:50 matt 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 1.31 2012/03/20 17:14:50 matt 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 rpc_reg_err[] = "%s: %s"; 87 static const char rpc_reg_msg[] = "rpc_reg: "; 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 #ifdef _REENTRANT 118 extern mutex_t proglst_lock; 119 #endif 120 121 if (procnum == NULLPROC) { 122 warnx("%s can't reassign procedure number %u", rpc_reg_msg, 123 NULLPROC); 124 return (-1); 125 } 126 127 if (nettype == NULL) 128 nettype = __UNCONST("netpath"); /* The default behavior */ 129 if ((handle = __rpc_setconf(nettype)) == NULL) { 130 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); 131 return (-1); 132 } 133 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 134 mutex_lock(&proglst_lock); 135 while ((nconf = __rpc_getconf(handle)) != NULL) { 136 struct proglst *pl; 137 SVCXPRT *svcxprt; 138 int madenow; 139 u_int recvsz; 140 char *xdrbuf; 141 char *netid; 142 143 madenow = FALSE; 144 svcxprt = NULL; 145 recvsz = 0; 146 xdrbuf = NULL; 147 netid = NULL; 148 for (pl = proglst; pl; pl = pl->p_nxt) 149 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 150 svcxprt = pl->p_transp; 151 xdrbuf = pl->p_xdrbuf; 152 recvsz = pl->p_recvsz; 153 netid = pl->p_netid; 154 break; 155 } 156 157 if (svcxprt == NULL) { 158 struct __rpc_sockinfo si; 159 160 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 161 if (svcxprt == NULL) 162 continue; 163 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 164 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2); 165 SVC_DESTROY(svcxprt); 166 continue; 167 } 168 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 169 if (recvsz == 0) { 170 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3); 171 SVC_DESTROY(svcxprt); 172 continue; 173 } 174 if (((xdrbuf = malloc((size_t)recvsz)) == NULL) || 175 ((netid = strdup(nconf->nc_netid)) == NULL)) { 176 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 177 if (xdrbuf != NULL) 178 free(xdrbuf); 179 if (netid != NULL) 180 free(netid); 181 SVC_DESTROY(svcxprt); 182 break; 183 } 184 madenow = TRUE; 185 } 186 /* 187 * Check if this (program, version, netid) had already been 188 * registered. The check may save a few RPC calls to rpcbind 189 */ 190 for (pl = proglst; pl; pl = pl->p_nxt) 191 if ((pl->p_prognum == prognum) && 192 (pl->p_versnum == versnum) && 193 (strcmp(pl->p_netid, netid) == 0)) 194 break; 195 if (pl == NULL) { /* Not yet */ 196 (void) rpcb_unset(prognum, versnum, nconf); 197 } else { 198 /* so that svc_reg does not call rpcb_set() */ 199 nconf = NULL; 200 } 201 202 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 203 warnx("%s couldn't register prog %u vers %u for %s", 204 rpc_reg_msg, (unsigned)prognum, 205 (unsigned)versnum, netid); 206 if (madenow) { 207 SVC_DESTROY(svcxprt); 208 free(xdrbuf); 209 free(netid); 210 } 211 continue; 212 } 213 214 pl = malloc(sizeof(*pl)); 215 if (pl == NULL) { 216 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 217 if (madenow) { 218 SVC_DESTROY(svcxprt); 219 free(xdrbuf); 220 free(netid); 221 } 222 break; 223 } 224 pl->p_progname = progname; 225 pl->p_prognum = prognum; 226 pl->p_versnum = versnum; 227 pl->p_procnum = procnum; 228 pl->p_inproc = inproc; 229 pl->p_outproc = outproc; 230 pl->p_transp = svcxprt; 231 pl->p_xdrbuf = xdrbuf; 232 pl->p_recvsz = recvsz; 233 pl->p_netid = netid; 234 pl->p_nxt = proglst; 235 proglst = pl; 236 done = TRUE; 237 } 238 __rpc_endconf(handle); 239 mutex_unlock(&proglst_lock); 240 241 if (done == FALSE) { 242 warnx("%s cant find suitable transport for %s", 243 rpc_reg_msg, nettype); 244 return (-1); 245 } 246 return (0); 247 } 248 249 /* 250 * The universal handler for the services registered using registerrpc. 251 * It handles both the connectionless and the connection oriented cases. 252 */ 253 254 static void 255 universal(struct svc_req *rqstp, SVCXPRT *transp) 256 { 257 rpcprog_t prog; 258 rpcvers_t vers; 259 rpcproc_t proc; 260 char *outdata; 261 char *xdrbuf; 262 struct proglst *pl; 263 #ifdef _REENTRANT 264 extern mutex_t proglst_lock; 265 #endif 266 267 _DIAGASSERT(rqstp != NULL); 268 _DIAGASSERT(transp != NULL); 269 270 /* 271 * enforce "procnum 0 is echo" convention 272 */ 273 if (rqstp->rq_proc == NULLPROC) { 274 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 275 FALSE) { 276 warnx("svc_sendreply failed"); 277 } 278 return; 279 } 280 prog = rqstp->rq_prog; 281 vers = rqstp->rq_vers; 282 proc = rqstp->rq_proc; 283 mutex_lock(&proglst_lock); 284 for (pl = proglst; pl; pl = pl->p_nxt) 285 if (pl->p_prognum == prog && pl->p_procnum == proc && 286 pl->p_versnum == vers && 287 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 288 /* decode arguments into a CLEAN buffer */ 289 xdrbuf = pl->p_xdrbuf; 290 /* Zero the arguments: reqd ! */ 291 (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz); 292 /* 293 * Assuming that sizeof (xdrbuf) would be enough 294 * for the arguments; if not then the program 295 * may bomb. BEWARE! 296 */ 297 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 298 svcerr_decode(transp); 299 mutex_unlock(&proglst_lock); 300 return; 301 } 302 outdata = (*(pl->p_progname))(xdrbuf); 303 if (outdata == NULL && 304 pl->p_outproc != (xdrproc_t) xdr_void){ 305 /* there was an error */ 306 mutex_unlock(&proglst_lock); 307 return; 308 } 309 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 310 warnx( 311 "rpc: rpc_reg trouble replying to prog %u vers %u", 312 (unsigned)prog, (unsigned)vers); 313 mutex_unlock(&proglst_lock); 314 return; 315 } 316 /* free the decoded arguments */ 317 (void) svc_freeargs(transp, pl->p_inproc, xdrbuf); 318 mutex_unlock(&proglst_lock); 319 return; 320 } 321 mutex_unlock(&proglst_lock); 322 /* This should never happen */ 323 warnx("rpc: rpc_reg: never registered prog %u vers %u", 324 (unsigned)prog, (unsigned)vers); 325 return; 326 } 327
Indexes created Wed Sep 24 02:09:48 GMT 2025