1 /* $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 christos Exp $ */ 2 /* $FreeBSD$ */ 3 4 /* 5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 6 * unrestricted use provided that this legend is included on all tape 7 * media and as a part of the software program in whole or part. Users 8 * may copy or modify Sun RPC without charge, but are not authorized 9 * to license or distribute it to anyone else except as part of a product or 10 * program developed by the user. 11 * 12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 15 * 16 * Sun RPC is provided with no support and without any obligation on the 17 * part of Sun Microsystems, Inc. to assist in its use, correction, 18 * modification or enhancement. 19 * 20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 22 * OR ANY PART THEREOF. 23 * 24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 25 * or profits or other special, indirect and consequential damages, even if 26 * Sun has been advised of the possibility of such damages. 27 * 28 * Sun Microsystems, Inc. 29 * 2550 Garcia Avenue 30 * Mountain View, California 94043 31 */ 32 /* 33 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 34 */ 35 36 /* #pragma ident "@(#)svc_simple.c 1.18 94/04/24 SMI" */ 37 38 /* 39 * svc_simple.c 40 * Simplified front end to rpc. 41 */ 42 43 /* 44 * This interface creates a virtual listener for all the services 45 * started thru rpc_reg(). It listens on the same endpoint for 46 * all the services and then executes the corresponding service 47 * for the given prognum and procnum. 48 */ 49 50 #include "namespace.h" 51 #include "reentrant.h" 52 #include <sys/types.h> 53 #include <rpc/rpc.h> 54 #include <rpc/nettype.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <err.h> 59 #include "un-namespace.h" 60 61 #include "rpc_com.h" 62 63 static void universal __P((struct svc_req *, SVCXPRT *)); 64 65 static struct proglst { 66 char *(*p_progname) __P((char *)); 67 rpcprog_t p_prognum; 68 rpcvers_t p_versnum; 69 rpcproc_t p_procnum; 70 SVCXPRT *p_transp; 71 char *p_netid; 72 char *p_xdrbuf; 73 int p_recvsz; 74 xdrproc_t p_inproc, p_outproc; 75 struct proglst *p_nxt; 76 } *proglst; 77 78 static const char rpc_reg_err[] = "%s: %s"; 79 static const char rpc_reg_msg[] = "rpc_reg: "; 80 static const char __reg_err1[] = "can't find appropriate transport"; 81 static const char __reg_err2[] = "can't get protocol info"; 82 static const char __reg_err3[] = "unsupported transport size"; 83 static const char __no_mem_str[] = "out of memory"; 84 85 /* 86 * For simplified, easy to use kind of rpc interfaces. 87 * nettype indicates the type of transport on which the service will be 88 * listening. Used for conservation of the system resource. Only one 89 * handle is created for all the services (actually one of each netid) 90 * and same xdrbuf is used for same netid. The size of the arguments 91 * is also limited by the recvsize for that transport, even if it is 92 * a COTS transport. This may be wrong, but for cases like these, they 93 * should not use the simplified interfaces like this. 94 */ 95 96 int 97 rpc_reg(prognum, versnum, procnum, progname, inproc, outproc, nettype) 98 rpcprog_t prognum; /* program number */ 99 rpcvers_t versnum; /* version number */ 100 rpcproc_t procnum; /* procedure number */ 101 char *(*progname) __P((char *)); /* Server routine */ 102 xdrproc_t inproc, outproc; /* in/out XDR procedures */ 103 char *nettype; /* nettype */ 104 { 105 struct netconfig *nconf; 106 int done = FALSE; 107 void *handle; 108 extern mutex_t proglst_lock; 109 110 111 112 if (procnum == NULLPROC) { 113 warnx("%s can't reassign procedure number %u", rpc_reg_msg, 114 NULLPROC); 115 return (-1); 116 } 117 118 if (nettype == NULL) 119 nettype = "netpath"; /* The default behavior */ 120 if ((handle = __rpc_setconf(nettype)) == NULL) { 121 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); 122 return (-1); 123 } 124 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 125 mutex_lock(&proglst_lock); 126 while ((nconf = __rpc_getconf(handle)) != NULL) { 127 struct proglst *pl; 128 SVCXPRT *svcxprt; 129 int madenow; 130 u_int recvsz; 131 char *xdrbuf; 132 char *netid; 133 134 madenow = FALSE; 135 svcxprt = NULL; 136 recvsz = 0; 137 xdrbuf = netid = NULL; 138 for (pl = proglst; pl; pl = pl->p_nxt) { 139 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 140 svcxprt = pl->p_transp; 141 xdrbuf = pl->p_xdrbuf; 142 recvsz = pl->p_recvsz; 143 netid = pl->p_netid; 144 break; 145 } 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 extern mutex_t proglst_lock; 253 254 /* 255 * enforce "procnum 0 is echo" convention 256 */ 257 if (rqstp->rq_proc == NULLPROC) { 258 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 259 FALSE) { 260 warnx("svc_sendreply failed"); 261 } 262 return; 263 } 264 prog = rqstp->rq_prog; 265 vers = rqstp->rq_vers; 266 proc = rqstp->rq_proc; 267 mutex_lock(&proglst_lock); 268 for (pl = proglst; pl; pl = pl->p_nxt) 269 if (pl->p_prognum == prog && pl->p_procnum == proc && 270 pl->p_versnum == vers && 271 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 272 /* decode arguments into a CLEAN buffer */ 273 xdrbuf = pl->p_xdrbuf; 274 /* Zero the arguments: reqd ! */ 275 (void) memset(xdrbuf, 0, sizeof (pl->p_recvsz)); 276 /* 277 * Assuming that sizeof (xdrbuf) would be enough 278 * for the arguments; if not then the program 279 * may bomb. BEWARE! 280 */ 281 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 282 svcerr_decode(transp); 283 mutex_unlock(&proglst_lock); 284 return; 285 } 286 outdata = (*(pl->p_progname))(xdrbuf); 287 if (outdata == NULL && 288 pl->p_outproc != (xdrproc_t) xdr_void){ 289 /* there was an error */ 290 mutex_unlock(&proglst_lock); 291 return; 292 } 293 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 294 warnx( 295 "rpc: rpc_reg trouble replying to prog %u vers %u", 296 (unsigned)prog, (unsigned)vers); 297 mutex_unlock(&proglst_lock); 298 return; 299 } 300 /* free the decoded arguments */ 301 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf); 302 mutex_unlock(&proglst_lock); 303 return; 304 } 305 mutex_unlock(&proglst_lock); 306 /* This should never happen */ 307 warnx("rpc: rpc_reg: never registered prog %u vers %u", 308 (unsigned)prog, (unsigned)vers); 309 return; 310 } 311