1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)svc_simple.c 1.18 87/08/11 Copyr 1984 Sun Micro 30 * @(#)svc_simple.c 2.2 88/08/01 4.0 RPCSRC 31 * $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 christos Exp $ 32 * $FreeBSD: src/lib/libc/rpc/svc_simple.c,v 1.16 2006/09/09 22:32:07 mbr Exp $ 33 * $DragonFly: src/lib/libc/rpc/svc_simple.c,v 1.3 2005/11/13 12:27:04 swildner Exp $ 34 */ 35 /* 36 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 37 */ 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(rpcprog_t prognum, /* program number */ 100 rpcvers_t versnum, /* version number */ 101 rpcproc_t procnum, /* procedure number */ 102 char *(*progname)(char *), /* Server routine */ 103 xdrproc_t inproc, xdrproc_t outproc, /* in/out XDR procedures */ 104 char *nettype) /* nettype */ 105 { 106 struct netconfig *nconf; 107 int done = FALSE; 108 void *handle; 109 110 111 if (procnum == NULLPROC) { 112 warnx("%s can't reassign procedure number %u", rpc_reg_msg, 113 NULLPROC); 114 return (-1); 115 } 116 117 if (nettype == NULL) 118 nettype = "netpath"; /* The default behavior */ 119 if ((handle = __rpc_setconf(nettype)) == NULL) { 120 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); 121 return (-1); 122 } 123 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 124 mutex_lock(&proglst_lock); 125 while ((nconf = __rpc_getconf(handle)) != NULL) { 126 struct proglst *pl; 127 SVCXPRT *svcxprt; 128 int madenow; 129 u_int recvsz; 130 char *xdrbuf; 131 char *netid; 132 133 madenow = FALSE; 134 svcxprt = NULL; 135 recvsz = 0; 136 xdrbuf = netid = NULL; 137 for (pl = proglst; pl; pl = pl->p_nxt) { 138 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 139 svcxprt = pl->p_transp; 140 xdrbuf = pl->p_xdrbuf; 141 recvsz = pl->p_recvsz; 142 netid = pl->p_netid; 143 break; 144 } 145 } 146 147 if (svcxprt == NULL) { 148 struct __rpc_sockinfo si; 149 150 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 151 if (svcxprt == NULL) 152 continue; 153 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 154 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2); 155 SVC_DESTROY(svcxprt); 156 continue; 157 } 158 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 159 if (recvsz == 0) { 160 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3); 161 SVC_DESTROY(svcxprt); 162 continue; 163 } 164 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) || 165 ((netid = strdup(nconf->nc_netid)) == NULL)) { 166 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 167 if (xdrbuf != NULL) 168 free(xdrbuf); 169 if (netid != NULL) 170 free(netid); 171 SVC_DESTROY(svcxprt); 172 break; 173 } 174 madenow = TRUE; 175 } 176 /* 177 * Check if this (program, version, netid) had already been 178 * registered. The check may save a few RPC calls to rpcbind 179 */ 180 for (pl = proglst; pl; pl = pl->p_nxt) 181 if ((pl->p_prognum == prognum) && 182 (pl->p_versnum == versnum) && 183 (strcmp(pl->p_netid, netid) == 0)) 184 break; 185 if (pl == NULL) { /* Not yet */ 186 rpcb_unset(prognum, versnum, nconf); 187 } else { 188 /* so that svc_reg does not call rpcb_set() */ 189 nconf = NULL; 190 } 191 192 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 193 warnx("%s couldn't register prog %u vers %u for %s", 194 rpc_reg_msg, (unsigned)prognum, 195 (unsigned)versnum, netid); 196 if (madenow) { 197 SVC_DESTROY(svcxprt); 198 free(xdrbuf); 199 free(netid); 200 } 201 continue; 202 } 203 204 pl = malloc(sizeof (struct proglst)); 205 if (pl == NULL) { 206 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 207 if (madenow) { 208 SVC_DESTROY(svcxprt); 209 free(xdrbuf); 210 free(netid); 211 } 212 break; 213 } 214 pl->p_progname = progname; 215 pl->p_prognum = prognum; 216 pl->p_versnum = versnum; 217 pl->p_procnum = procnum; 218 pl->p_inproc = inproc; 219 pl->p_outproc = outproc; 220 pl->p_transp = svcxprt; 221 pl->p_xdrbuf = xdrbuf; 222 pl->p_recvsz = recvsz; 223 pl->p_netid = netid; 224 pl->p_nxt = proglst; 225 proglst = pl; 226 done = TRUE; 227 } 228 __rpc_endconf(handle); 229 mutex_unlock(&proglst_lock); 230 231 if (done == FALSE) { 232 warnx("%s can't find suitable transport for %s", 233 rpc_reg_msg, nettype); 234 return (-1); 235 } 236 return (0); 237 } 238 239 /* 240 * The universal handler for the services registered using registerrpc. 241 * It handles both the connectionless and the connection oriented cases. 242 */ 243 244 static void 245 universal(struct svc_req *rqstp, SVCXPRT *transp) 246 { 247 rpcprog_t prog; 248 rpcvers_t vers; 249 rpcproc_t proc; 250 char *outdata; 251 char *xdrbuf; 252 struct proglst *pl; 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 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 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