1 /* $NetBSD: svc_simple.c,v 1.26 2003/09/09 03:56:40 itojun 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 1.26 2003/09/09 03:56:40 itojun 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 __P((struct svc_req *, SVCXPRT *)); 72 73 static struct proglst { 74 char *(*p_progname) __P((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(prognum, versnum, procnum, progname, inproc, outproc, nettype) 106 rpcprog_t prognum; /* program number */ 107 rpcvers_t versnum; /* version number */ 108 rpcproc_t procnum; /* procedure number */ 109 char *(*progname) __P((char *)); /* Server routine */ 110 xdrproc_t inproc, outproc; /* in/out XDR procedures */ 111 char *nettype; /* nettype */ 112 { 113 struct netconfig *nconf; 114 int done = FALSE; 115 void *handle; 116 #ifdef _REENTRANT 117 extern mutex_t proglst_lock; 118 #endif 119 120 if (procnum == NULLPROC) { 121 warnx("%s can't reassign procedure number %u", rpc_reg_msg, 122 NULLPROC); 123 return (-1); 124 } 125 126 if (nettype == NULL) 127 nettype = "netpath"; /* The default behavior */ 128 if ((handle = __rpc_setconf(nettype)) == NULL) { 129 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); 130 return (-1); 131 } 132 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 133 mutex_lock(&proglst_lock); 134 while ((nconf = __rpc_getconf(handle)) != NULL) { 135 struct proglst *pl; 136 SVCXPRT *svcxprt; 137 int madenow; 138 u_int recvsz; 139 char *xdrbuf; 140 char *netid; 141 142 madenow = FALSE; 143 svcxprt = NULL; 144 for (pl = proglst; pl; pl = pl->p_nxt) 145 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 146 svcxprt = pl->p_transp; 147 xdrbuf = pl->p_xdrbuf; 148 recvsz = pl->p_recvsz; 149 netid = pl->p_netid; 150 break; 151 } 152 153 if (svcxprt == NULL) { 154 struct __rpc_sockinfo si; 155 156 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 157 if (svcxprt == NULL) 158 continue; 159 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 160 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2); 161 SVC_DESTROY(svcxprt); 162 continue; 163 } 164 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 165 if (recvsz == 0) { 166 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3); 167 SVC_DESTROY(svcxprt); 168 continue; 169 } 170 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) || 171 ((netid = strdup(nconf->nc_netid)) == NULL)) { 172 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 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 cant 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 */ 245 246 static void 247 universal(rqstp, transp) 248 struct svc_req *rqstp; 249 SVCXPRT *transp; 250 { 251 rpcprog_t prog; 252 rpcvers_t vers; 253 rpcproc_t proc; 254 char *outdata; 255 char *xdrbuf; 256 struct proglst *pl; 257 #ifdef _REENTRANT 258 extern mutex_t proglst_lock; 259 #endif 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("svc_sendreply failed"); 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( 305 "rpc: rpc_reg trouble replying to prog %u vers %u", 306 (unsigned)prog, (unsigned)vers); 307 mutex_unlock(&proglst_lock); 308 return; 309 } 310 /* free the decoded arguments */ 311 (void) svc_freeargs(transp, pl->p_inproc, xdrbuf); 312 mutex_unlock(&proglst_lock); 313 return; 314 } 315 mutex_unlock(&proglst_lock); 316 /* This should never happen */ 317 warnx("rpc: rpc_reg: never registered prog %u vers %u", 318 (unsigned)prog, (unsigned)vers); 319 return; 320 } 321