svc_simple.c revision 74462
1/* $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 christos Exp $ */ 2/* $FreeBSD: head/lib/libc/rpc/svc_simple.c 74462 2001-03-19 12:50:13Z alfred $ */ 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 "reentrant.h" 51#include "namespace.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 63static void universal __P((struct svc_req *, SVCXPRT *)); 64 65static 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 78static const char rpc_reg_err[] = "%s: %s"; 79static const char rpc_reg_msg[] = "rpc_reg: "; 80static const char __reg_err1[] = "can't find appropriate transport"; 81static const char __reg_err2[] = "can't get protocol info"; 82static const char __reg_err3[] = "unsupported transport size"; 83static 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 96int 97rpc_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 for (pl = proglst; pl; pl = pl->p_nxt) 137 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 138 svcxprt = pl->p_transp; 139 xdrbuf = pl->p_xdrbuf; 140 recvsz = pl->p_recvsz; 141 netid = pl->p_netid; 142 break; 143 } 144 145 if (svcxprt == NULL) { 146 struct __rpc_sockinfo si; 147 148 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 149 if (svcxprt == NULL) 150 continue; 151 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { 152 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2); 153 SVC_DESTROY(svcxprt); 154 continue; 155 } 156 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); 157 if (recvsz == 0) { 158 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3); 159 SVC_DESTROY(svcxprt); 160 continue; 161 } 162 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) || 163 ((netid = strdup(nconf->nc_netid)) == NULL)) { 164 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 165 SVC_DESTROY(svcxprt); 166 break; 167 } 168 madenow = TRUE; 169 } 170 /* 171 * Check if this (program, version, netid) had already been 172 * registered. The check may save a few RPC calls to rpcbind 173 */ 174 for (pl = proglst; pl; pl = pl->p_nxt) 175 if ((pl->p_prognum == prognum) && 176 (pl->p_versnum == versnum) && 177 (strcmp(pl->p_netid, netid) == 0)) 178 break; 179 if (pl == NULL) { /* Not yet */ 180 (void) rpcb_unset(prognum, versnum, nconf); 181 } else { 182 /* so that svc_reg does not call rpcb_set() */ 183 nconf = NULL; 184 } 185 186 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 187 warnx("%s couldn't register prog %u vers %u for %s", 188 rpc_reg_msg, (unsigned)prognum, 189 (unsigned)versnum, netid); 190 if (madenow) { 191 SVC_DESTROY(svcxprt); 192 free(xdrbuf); 193 free(netid); 194 } 195 continue; 196 } 197 198 pl = malloc(sizeof (struct proglst)); 199 if (pl == NULL) { 200 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); 201 if (madenow) { 202 SVC_DESTROY(svcxprt); 203 free(xdrbuf); 204 free(netid); 205 } 206 break; 207 } 208 pl->p_progname = progname; 209 pl->p_prognum = prognum; 210 pl->p_versnum = versnum; 211 pl->p_procnum = procnum; 212 pl->p_inproc = inproc; 213 pl->p_outproc = outproc; 214 pl->p_transp = svcxprt; 215 pl->p_xdrbuf = xdrbuf; 216 pl->p_recvsz = recvsz; 217 pl->p_netid = netid; 218 pl->p_nxt = proglst; 219 proglst = pl; 220 done = TRUE; 221 } 222 __rpc_endconf(handle); 223 mutex_unlock(&proglst_lock); 224 225 if (done == FALSE) { 226 warnx("%s cant find suitable transport for %s", 227 rpc_reg_msg, nettype); 228 return (-1); 229 } 230 return (0); 231} 232 233/* 234 * The universal handler for the services registered using registerrpc. 235 * It handles both the connectionless and the connection oriented cases. 236 */ 237 238static void 239universal(rqstp, transp) 240 struct svc_req *rqstp; 241 SVCXPRT *transp; 242{ 243 rpcprog_t prog; 244 rpcvers_t vers; 245 rpcproc_t proc; 246 char *outdata; 247 char *xdrbuf; 248 struct proglst *pl; 249 extern mutex_t proglst_lock; 250 251 /* 252 * enforce "procnum 0 is echo" convention 253 */ 254 if (rqstp->rq_proc == NULLPROC) { 255 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == 256 FALSE) { 257 warnx("svc_sendreply failed"); 258 } 259 return; 260 } 261 prog = rqstp->rq_prog; 262 vers = rqstp->rq_vers; 263 proc = rqstp->rq_proc; 264 mutex_lock(&proglst_lock); 265 for (pl = proglst; pl; pl = pl->p_nxt) 266 if (pl->p_prognum == prog && pl->p_procnum == proc && 267 pl->p_versnum == vers && 268 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 269 /* decode arguments into a CLEAN buffer */ 270 xdrbuf = pl->p_xdrbuf; 271 /* Zero the arguments: reqd ! */ 272 (void) memset(xdrbuf, 0, sizeof (pl->p_recvsz)); 273 /* 274 * Assuming that sizeof (xdrbuf) would be enough 275 * for the arguments; if not then the program 276 * may bomb. BEWARE! 277 */ 278 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 279 svcerr_decode(transp); 280 mutex_unlock(&proglst_lock); 281 return; 282 } 283 outdata = (*(pl->p_progname))(xdrbuf); 284 if (outdata == NULL && 285 pl->p_outproc != (xdrproc_t) xdr_void){ 286 /* there was an error */ 287 mutex_unlock(&proglst_lock); 288 return; 289 } 290 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 291 warnx( 292 "rpc: rpc_reg trouble replying to prog %u vers %u", 293 (unsigned)prog, (unsigned)vers); 294 mutex_unlock(&proglst_lock); 295 return; 296 } 297 /* free the decoded arguments */ 298 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf); 299 mutex_unlock(&proglst_lock); 300 return; 301 } 302 mutex_unlock(&proglst_lock); 303 /* This should never happen */ 304 warnx("rpc: rpc_reg: never registered prog %u vers %u", 305 (unsigned)prog, (unsigned)vers); 306 return; 307} 308