1 /* $NetBSD: svc_simple.c,v 1.22 2002/11/08 00:13:08 fvdl 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 "namespace.h" 50 #include "reentrant.h" 51 #include <sys/types.h> 52 #include <rpc/rpc.h> 53 #include <rpc/nettype.h> 54 #include <assert.h> 55 #include <err.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 60 #include "rpc_internal.h" 61 62 #ifdef __weak_alias 63 __weak_alias(rpc_reg,_rpc_reg) 64 #endif 65 66 static void universal __P((struct svc_req *, SVCXPRT *)); 67 68 static struct proglst { 69 char *(*p_progname) __P((char *)); 70 rpcprog_t p_prognum; 71 rpcvers_t p_versnum; 72 rpcproc_t p_procnum; 73 SVCXPRT *p_transp; 74 char *p_netid; 75 char *p_xdrbuf; 76 int p_recvsz; 77 xdrproc_t p_inproc, p_outproc; 78 struct proglst *p_nxt; 79 } *proglst; 80 81 static const char rpc_reg_err[] = "%s: %s"; 82 static const char rpc_reg_msg[] = "rpc_reg: "; 83 static const char __reg_err1[] = "can't find appropriate transport"; 84 static const char __reg_err2[] = "can't get protocol info"; 85 static const char __reg_err3[] = "unsupported transport size"; 86 static const char __no_mem_str[] = "out of memory"; 87 88 /* 89 * For simplified, easy to use kind of rpc interfaces. 90 * nettype indicates the type of transport on which the service will be 91 * listening. Used for conservation of the system resource. Only one 92 * handle is created for all the services (actually one of each netid) 93 * and same xdrbuf is used for same netid. The size of the arguments 94 * is also limited by the recvsize for that transport, even if it is 95 * a COTS transport. This may be wrong, but for cases like these, they 96 * should not use the simplified interfaces like this. 97 */ 98 99 int 100 rpc_reg(prognum, versnum, procnum, progname, inproc, outproc, nettype) 101 rpcprog_t prognum; /* program number */ 102 rpcvers_t versnum; /* version number */ 103 rpcproc_t procnum; /* procedure number */ 104 char *(*progname) __P((char *)); /* Server routine */ 105 xdrproc_t inproc, outproc; /* in/out XDR procedures */ 106 char *nettype; /* nettype */ 107 { 108 struct netconfig *nconf; 109 int done = FALSE; 110 void *handle; 111 #ifdef __REENT 112 extern mutex_t proglst_lock; 113 #endif 114 115 if (procnum == NULLPROC) { 116 warnx("%s can't reassign procedure number %u", rpc_reg_msg, 117 NULLPROC); 118 return (-1); 119 } 120 121 if (nettype == NULL) 122 nettype = "netpath"; /* The default behavior */ 123 if ((handle = __rpc_setconf(nettype)) == NULL) { 124 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); 125 return (-1); 126 } 127 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 128 mutex_lock(&proglst_lock); 129 while ((nconf = __rpc_getconf(handle)) != NULL) { 130 struct proglst *pl; 131 SVCXPRT *svcxprt; 132 int madenow; 133 u_int recvsz; 134 char *xdrbuf; 135 char *netid; 136 137 madenow = FALSE; 138 svcxprt = NULL; 139 for (pl = proglst; pl; pl = pl->p_nxt) 140 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 141 svcxprt = pl->p_transp; 142 xdrbuf = pl->p_xdrbuf; 143 recvsz = pl->p_recvsz; 144 netid = pl->p_netid; 145 break; 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 SVC_DESTROY(svcxprt); 169 break; 170 } 171 madenow = TRUE; 172 } 173 /* 174 * Check if this (program, version, netid) had already been 175 * registered. The check may save a few RPC calls to rpcbind 176 */ 177 for (pl = proglst; pl; pl = pl->p_nxt) 178 if ((pl->p_prognum == prognum) && 179 (pl->p_versnum == versnum) && 180 (strcmp(pl->p_netid, netid) == 0)) 181 break; 182 if (pl == NULL) { /* Not yet */ 183 (void) rpcb_unset(prognum, versnum, nconf); 184 } else { 185 /* so that svc_reg does not call rpcb_set() */ 186 nconf = NULL; 187 } 188 189 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 190 warnx("%s couldn't register prog %u vers %u for %s", 191 rpc_reg_msg, (unsigned)prognum, 192 (unsigned)versnum, netid); 193 if (madenow) { 194 SVC_DESTROY(svcxprt); 195 free(xdrbuf); 196 free(netid); 197 } 198 continue; 199 } 200 201 pl = malloc(sizeof (struct proglst)); 202 if (pl == NULL) { 203 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 204 if (madenow) { 205 SVC_DESTROY(svcxprt); 206 free(xdrbuf); 207 free(netid); 208 } 209 break; 210 } 211 pl->p_progname = progname; 212 pl->p_prognum = prognum; 213 pl->p_versnum = versnum; 214 pl->p_procnum = procnum; 215 pl->p_inproc = inproc; 216 pl->p_outproc = outproc; 217 pl->p_transp = svcxprt; 218 pl->p_xdrbuf = xdrbuf; 219 pl->p_recvsz = recvsz; 220 pl->p_netid = netid; 221 pl->p_nxt = proglst; 222 proglst = pl; 223 done = TRUE; 224 } 225 __rpc_endconf(handle); 226 mutex_unlock(&proglst_lock); 227 228 if (done == FALSE) { 229 warnx("%s cant find suitable transport for %s", 230 rpc_reg_msg, nettype); 231 return (-1); 232 } 233 return (0); 234 } 235 236 /* 237 * The universal handler for the services registered using registerrpc. 238 * It handles both the connectionless and the connection oriented cases. 239 */ 240 241 static void 242 universal(rqstp, transp) 243 struct svc_req *rqstp; 244 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 #ifdef __REENT 253 extern mutex_t proglst_lock; 254 #endif 255 256 _DIAGASSERT(rqstp != NULL); 257 _DIAGASSERT(transp != NULL); 258 259 /* 260 * enforce "procnum 0 is echo" convention 261 */ 262 if (rqstp->rq_proc == NULLPROC) { 263 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 264 FALSE) { 265 warnx("svc_sendreply failed"); 266 } 267 return; 268 } 269 prog = rqstp->rq_prog; 270 vers = rqstp->rq_vers; 271 proc = rqstp->rq_proc; 272 mutex_lock(&proglst_lock); 273 for (pl = proglst; pl; pl = pl->p_nxt) 274 if (pl->p_prognum == prog && pl->p_procnum == proc && 275 pl->p_versnum == vers && 276 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 277 /* decode arguments into a CLEAN buffer */ 278 xdrbuf = pl->p_xdrbuf; 279 /* Zero the arguments: reqd ! */ 280 (void) memset(xdrbuf, 0, sizeof (pl->p_recvsz)); 281 /* 282 * Assuming that sizeof (xdrbuf) would be enough 283 * for the arguments; if not then the program 284 * may bomb. BEWARE! 285 */ 286 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 287 svcerr_decode(transp); 288 mutex_unlock(&proglst_lock); 289 return; 290 } 291 outdata = (*(pl->p_progname))(xdrbuf); 292 if (outdata == NULL && 293 pl->p_outproc != (xdrproc_t) xdr_void){ 294 /* there was an error */ 295 mutex_unlock(&proglst_lock); 296 return; 297 } 298 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 299 warnx( 300 "rpc: rpc_reg trouble replying to prog %u vers %u", 301 (unsigned)prog, (unsigned)vers); 302 mutex_unlock(&proglst_lock); 303 return; 304 } 305 /* free the decoded arguments */ 306 (void) svc_freeargs(transp, pl->p_inproc, xdrbuf); 307 mutex_unlock(&proglst_lock); 308 return; 309 } 310 mutex_unlock(&proglst_lock); 311 /* This should never happen */ 312 warnx("rpc: rpc_reg: never registered prog %u vers %u", 313 (unsigned)prog, (unsigned)vers); 314 return; 315 } 316