1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 /* 30 * Portions of this source code were derived from Berkeley 31 * 4.3 BSD under license from the Regents of the University of 32 * California. 33 */ 34 35 #pragma ident "%Z%%M% %I% %E% 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 "mt.h" 50 #include "rpc_mt.h" 51 #include <errno.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <rpc/rpc.h> 56 #include <sys/types.h> 57 #include <syslog.h> 58 #include <rpc/nettype.h> 59 60 static struct proglst { 61 char *(*p_progname)(); 62 rpcprog_t p_prognum; 63 rpcvers_t p_versnum; 64 rpcproc_t p_procnum; 65 SVCXPRT *p_transp; 66 char *p_netid; 67 char *p_xdrbuf; 68 int p_recvsz; 69 xdrproc_t p_inproc, p_outproc; 70 struct proglst *p_nxt; 71 } *proglst; 72 73 static void universal(); 74 75 static const char rpc_reg_err[] = "%s: %s"; 76 static const char rpc_reg_msg[] = "rpc_reg: "; 77 static const char __reg_err1[] = "can't find appropriate transport"; 78 static const char __reg_err3[] = "unsupported transport size"; 79 static const char __no_mem_str[] = "out of memory"; 80 /* 81 * For simplified, easy to use kind of rpc interfaces. 82 * nettype indicates the type of transport on which the service will be 83 * listening. Used for conservation of the system resource. Only one 84 * handle is created for all the services (actually one of each netid) 85 * and same xdrbuf is used for same netid. The size of the arguments 86 * is also limited by the recvsize for that transport, even if it is 87 * a COTS transport. This may be wrong, but for cases like these, they 88 * should not use the simplified interfaces like this. 89 */ 90 91 int 92 rpc_reg(const rpcprog_t prognum, const rpcvers_t versnum, 93 const rpcproc_t procnum, char *(*progname)(), const xdrproc_t inproc, 94 const xdrproc_t outproc, const char *nettype) 95 { 96 struct netconfig *nconf; 97 int done = FALSE; 98 void *handle; 99 extern mutex_t proglst_lock; 100 101 if (procnum == NULLPROC) { 102 (void) syslog(LOG_ERR, (const char *) "%s: %s %d", 103 rpc_reg_msg, 104 (const char *) "can't reassign procedure number %d", 105 NULLPROC); 106 return (-1); 107 } 108 109 if (nettype == NULL) 110 nettype = "netpath"; /* The default behavior */ 111 if ((handle = __rpc_setconf((char *)nettype)) == NULL) { 112 (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg, __reg_err1); 113 return (-1); 114 } 115 /* VARIABLES PROTECTED BY proglst_lock: proglst */ 116 (void) mutex_lock(&proglst_lock); 117 while (nconf = __rpc_getconf(handle)) { 118 struct proglst *pl; 119 SVCXPRT *svcxprt; 120 int madenow; 121 uint_t recvsz; 122 char *xdrbuf; 123 char *netid; 124 125 madenow = FALSE; 126 svcxprt = NULL; 127 for (pl = proglst; pl; pl = pl->p_nxt) 128 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { 129 svcxprt = pl->p_transp; 130 xdrbuf = pl->p_xdrbuf; 131 recvsz = pl->p_recvsz; 132 netid = pl->p_netid; 133 break; 134 } 135 136 if (svcxprt == NULL) { 137 struct t_info tinfo; 138 139 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); 140 if (svcxprt == NULL) 141 continue; 142 if (t_getinfo(svcxprt->xp_fd, &tinfo) == -1) { 143 char errorstr[100]; 144 145 __tli_sys_strerror(errorstr, sizeof (errorstr), 146 t_errno, errno); 147 (void) syslog(LOG_ERR, "%s : %s : %s", 148 rpc_reg_msg, "t_getinfo failed", 149 errorstr); 150 SVC_DESTROY(svcxprt); 151 continue; 152 } 153 if ((recvsz = __rpc_get_t_size(0, tinfo.tsdu)) == 0) { 154 (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg, 155 __reg_err3); 156 SVC_DESTROY(svcxprt); 157 continue; 158 } 159 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) || 160 ((netid = strdup(nconf->nc_netid)) == NULL)) { 161 (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg, 162 __no_mem_str); 163 SVC_DESTROY(svcxprt); 164 break; 165 } 166 madenow = TRUE; 167 } 168 /* 169 * Check if this (program, version, netid) had already been 170 * registered. The check may save a few RPC calls to rpcbind 171 */ 172 for (pl = proglst; pl; pl = pl->p_nxt) 173 if ((pl->p_prognum == prognum) && 174 (pl->p_versnum == versnum) && 175 (strcmp(pl->p_netid, netid) == 0)) 176 break; 177 if (pl == NULL) { /* Not yet */ 178 (void) rpcb_unset(prognum, versnum, nconf); 179 } else { 180 /* so that svc_reg does not call rpcb_set() */ 181 nconf = NULL; 182 } 183 184 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { 185 (void) syslog(LOG_ERR, 186 "%s couldn't register prog %d vers %d for %s", 187 rpc_reg_msg, prognum, versnum, netid); 188 if (madenow) { 189 SVC_DESTROY(svcxprt); 190 free(xdrbuf); 191 free(netid); 192 } 193 continue; 194 } 195 196 pl = malloc(sizeof (struct proglst)); 197 if (pl == NULL) { 198 (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg, 199 __no_mem_str); 200 if (madenow) { 201 SVC_DESTROY(svcxprt); 202 free(xdrbuf); 203 free(netid); 204 } 205 break; 206 } 207 pl->p_progname = progname; 208 pl->p_prognum = prognum; 209 pl->p_versnum = versnum; 210 pl->p_procnum = procnum; 211 pl->p_inproc = inproc; 212 pl->p_outproc = outproc; 213 pl->p_transp = svcxprt; 214 pl->p_xdrbuf = xdrbuf; 215 pl->p_recvsz = recvsz; 216 pl->p_netid = netid; 217 pl->p_nxt = proglst; 218 proglst = pl; 219 done = TRUE; 220 } 221 __rpc_endconf(handle); 222 (void) mutex_unlock(&proglst_lock); 223 224 if (done == FALSE) { 225 (void) syslog(LOG_ERR, 226 (const char *) "%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 */ 237 238 static void 239 universal(struct svc_req *rqstp, SVCXPRT *transp) 240 { 241 rpcprog_t prog; 242 rpcvers_t vers; 243 rpcproc_t proc; 244 char *outdata; 245 char *xdrbuf; 246 struct proglst *pl; 247 extern mutex_t proglst_lock; 248 249 /* 250 * enforce "procnum 0 is echo" convention 251 */ 252 if (rqstp->rq_proc == NULLPROC) { 253 if (svc_sendreply(transp, (xdrproc_t)xdr_void, NULL) == FALSE) { 254 (void) syslog(LOG_ERR, 255 (const char *) "svc_sendreply failed"); 256 } 257 return; 258 } 259 prog = rqstp->rq_prog; 260 vers = rqstp->rq_vers; 261 proc = rqstp->rq_proc; 262 (void) mutex_lock(&proglst_lock); 263 for (pl = proglst; pl; pl = pl->p_nxt) { 264 if (pl->p_prognum == prog && pl->p_procnum == proc && 265 pl->p_versnum == vers && 266 (strcmp(pl->p_netid, transp->xp_netid) == 0)) { 267 /* decode arguments into a CLEAN buffer */ 268 xdrbuf = pl->p_xdrbuf; 269 /* Zero the arguments: reqd ! */ 270 (void) memset(xdrbuf, 0, pl->p_recvsz); 271 /* 272 * Assuming that sizeof (xdrbuf) would be enough 273 * for the arguments; if not then the program 274 * may bomb. BEWARE! 275 */ 276 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { 277 svcerr_decode(transp); 278 (void) mutex_unlock(&proglst_lock); 279 return; 280 } 281 outdata = (*(pl->p_progname))(xdrbuf); 282 if (outdata == NULL && 283 pl->p_outproc != (xdrproc_t)xdr_void) { 284 /* there was an error */ 285 (void) mutex_unlock(&proglst_lock); 286 return; 287 } 288 if (!svc_sendreply(transp, pl->p_outproc, outdata)) { 289 (void) syslog(LOG_ERR, (const char *) 290 "rpc: rpc_reg trouble replying to prog %d vers %d", 291 prog, vers); 292 (void) mutex_unlock(&proglst_lock); 293 return; 294 } 295 /* free the decoded arguments */ 296 (void) svc_freeargs(transp, pl->p_inproc, xdrbuf); 297 (void) mutex_unlock(&proglst_lock); 298 return; 299 } 300 } 301 (void) mutex_unlock(&proglst_lock); 302 /* This should never happen */ 303 (void) syslog(LOG_ERR, (const char *) 304 "rpc: rpc_reg: never registered prog %d vers %d", 305 prog, vers); 306 } 307