1 /* $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 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 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * svc_simple.c 41 * Simplified front end to rpc. 42 */ 43 44 /* 45 * This interface creates a virtual listener for all the services 46 * started thru rpc_reg(). It listens on the same endpoint for 47 * all the services and then executes the corresponding service 48 * for the given prognum and procnum. 49 */ 50 51 #include "namespace.h" 52 #include "reentrant.h" 53 #include <sys/types.h> 54 #include <rpc/rpc.h> 55 #include <rpc/nettype.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <err.h> 60 #include "un-namespace.h" 61 62 #include "rpc_com.h" 63 #include "mt_misc.h" 64 65 static void universal(struct svc_req *, SVCXPRT *); 66 67 static struct proglst { 68 char *(*p_progname)(char *); 69 rpcprog_t p_prognum; 70 rpcvers_t p_versnum; 71 rpcproc_t p_procnum; 72 SVCXPRT *p_transp; 73 char *p_netid; 74 char *p_xdrbuf; 75 int p_recvsz; 76 xdrproc_t p_inproc, p_outproc; 77 struct proglst *p_nxt; 78 } *proglst; 79 80 static const char rpc_reg_err[] = "%s: %s"; 81 static const char rpc_reg_msg[] = "rpc_reg: "; 82 static const char __reg_err1[] = "can't find appropriate transport"; 83 static const char __reg_err2[] = "can't get protocol info"; 84 static const char __reg_err3[] = "unsupported transport size"; 85 static const char __no_mem_str[] = "out of memory"; 86 87 /* 88 * For simplified, easy to use kind of rpc interfaces. 89 * nettype indicates the type of transport on which the service will be 90 * listening. Used for conservation of the system resource. Only one 91 * handle is created for all the services (actually one of each netid) 92 * and same xdrbuf is used for same netid. The size of the arguments 93 * is also limited by the recvsize for that transport, even if it is 94 * a COTS transport. This may be wrong, but for cases like these, they 95 * should not use the simplified interfaces like this. 96 */ 97 98 int 99 rpc_reg(prognum, versnum, procnum, progname, inproc, outproc, nettype) 100 rpcprog_t prognum; /* program number */ 101 rpcvers_t versnum; /* version number */ 102 rpcproc_t procnum; /* procedure number */ 103 char *(*progname)(char *); /* Server routine */ 104 xdrproc_t inproc, outproc; /* in/out XDR procedures */ 105 char *nettype; /* nettype */ 106 { 107 struct netconfig *nconf; 108 int done = FALSE; 109 void *handle; 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; 252 253 /* 254 * enforce "procnum 0 is echo" convention 255 */ 256 if (rqstp->rq_proc == NULLPROC) { 257 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 258 FALSE) { 259 warnx("svc_sendreply failed"); 260 } 261 return; 262 } 263 prog = rqstp->rq_prog; 264 vers = rqstp->rq_vers; 265 proc = rqstp->rq_proc; 266 mutex_lock(&proglst_lock); 267 for (pl = proglst; pl; pl = pl->p_nxt) 268 if (pl->p_prognum == prog && pl->p_procnum == proc && 269 pl->p_versnum == vers && 270 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 271 /* decode arguments into a CLEAN buffer */ 272 xdrbuf = pl->p_xdrbuf; 273 /* Zero the arguments: reqd ! */ 274 (void) memset(xdrbuf, 0, sizeof (pl->p_recvsz)); 275 /* 276 * Assuming that sizeof (xdrbuf) would be enough 277 * for the arguments; if not then the program 278 * may bomb. BEWARE! 279 */ 280 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 281 svcerr_decode(transp); 282 mutex_unlock(&proglst_lock); 283 return; 284 } 285 outdata = (*(pl->p_progname))(xdrbuf); 286 if (outdata == NULL && 287 pl->p_outproc != (xdrproc_t) xdr_void){ 288 /* there was an error */ 289 mutex_unlock(&proglst_lock); 290 return; 291 } 292 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 293 warnx( 294 "rpc: rpc_reg trouble replying to prog %u vers %u", 295 (unsigned)prog, (unsigned)vers); 296 mutex_unlock(&proglst_lock); 297 return; 298 } 299 /* free the decoded arguments */ 300 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf); 301 mutex_unlock(&proglst_lock); 302 return; 303 } 304 mutex_unlock(&proglst_lock); 305 /* This should never happen */ 306 warnx("rpc: rpc_reg: never registered prog %u vers %u", 307 (unsigned)prog, (unsigned)vers); 308 return; 309 } 310