usr/src/lib/libc/port/nsl/svc_simple.c

   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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
  26 /* All Rights Reserved */
  27 /*
  28  * Portions of this source code were derived from Berkeley
  29  * 4.3 BSD under license from the Regents of the University of
  30  * California.
  31  */
  32
  33 /*
  34  * svc_simple.c
  35  * Simplified front end to rpc.
  36  */
  37
  38 /*
  39  * This interface creates a virtual listener for all the services
  40  * started thru rpc_reg(). It listens on the same endpoint for
  41  * all the services and then executes the corresponding service
  42  * for the given prognum and procnum.
  43  */
  44
  45 #include "mt.h"
  46 #include "rpc_mt.h"
  47 #include <errno.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <rpc/rpc.h>
  52 #include <sys/types.h>
  53 #include <syslog.h>
  54 #include <rpc/nettype.h>
  55
  56 static struct proglst {
  57         char *(*p_progname)();
  58         rpcprog_t p_prognum;
  59         rpcvers_t p_versnum;
  60         rpcproc_t p_procnum;
  61         SVCXPRT *p_transp;
  62         char *p_netid;
  63         char *p_xdrbuf;
  64         int p_recvsz;
  65         xdrproc_t p_inproc, p_outproc;
  66         struct proglst *p_nxt;
  67 } *proglst;
  68
  69 static void universal();
  70
  71 static const char rpc_reg_err[] = "%s: %s";
  72 static const char rpc_reg_msg[] = "rpc_reg: ";
  73 static const char __reg_err1[] = "can't find appropriate transport";
  74 static const char __reg_err3[] = "unsupported transport size";
  75 static const char __no_mem_str[] = "out of memory";
  76 /*
  77  * For simplified, easy to use kind of rpc interfaces.
  78  * nettype indicates the type of transport on which the service will be
  79  * listening. Used for conservation of the system resource. Only one
  80  * handle is created for all the services (actually one of each netid)
  81  * and same xdrbuf is used for same netid. The size of the arguments
  82  * is also limited by the recvsize for that transport, even if it is
  83  * a COTS transport. This may be wrong, but for cases like these, they
  84  * should not use the simplified interfaces like this.
  85  */
  86
  87 int
  88 rpc_reg(const rpcprog_t prognum, const rpcvers_t versnum,
  89         const rpcproc_t procnum, char *(*progname)(), const xdrproc_t inproc,
  90         const xdrproc_t outproc, const char *nettype)
  91 {
  92         struct netconfig *nconf;
  93         int done = FALSE;
  94         void *handle;
  95         extern mutex_t proglst_lock;
  96
  97         if (procnum == NULLPROC) {
  98                 (void) syslog(LOG_ERR, (const char *) "%s: %s %d",
  99                         rpc_reg_msg,
 100                         (const char *) "can't reassign procedure number %d",
 101                         NULLPROC);
 102                 return (-1);
 103         }
 104
 105         if (nettype == NULL)
 106                 nettype = "netpath";            /* The default behavior */
 107         if ((handle = __rpc_setconf((char *)nettype)) == NULL) {
 108                 (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg, __reg_err1);
 109                 return (-1);
 110         }
 111 /* VARIABLES PROTECTED BY proglst_lock: proglst */
 112         (void) mutex_lock(&proglst_lock);
 113         while (nconf = __rpc_getconf(handle)) {
 114                 struct proglst *pl;
 115                 SVCXPRT *svcxprt;
 116                 int madenow;
 117                 uint_t recvsz;
 118                 char *xdrbuf;
 119                 char *netid;
 120
 121                 madenow = FALSE;
 122                 svcxprt = NULL;
 123                 for (pl = proglst; pl; pl = pl->p_nxt)
 124                         if (strcmp(pl->p_netid, nconf->nc_netid) == 0) {
 125                                 svcxprt = pl->p_transp;
 126                                 xdrbuf = pl->p_xdrbuf;
 127                                 recvsz = pl->p_recvsz;
 128                                 netid = pl->p_netid;
 129                                 break;
 130                         }
 131
 132                 if (svcxprt == NULL) {
 133                         struct t_info tinfo;
 134
 135                         svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
 136                         if (svcxprt == NULL)
 137                                 continue;
 138                         if (t_getinfo(svcxprt->xp_fd, &tinfo) == -1) {
 139                                 char errorstr[100];
 140
 141                                 __tli_sys_strerror(errorstr, sizeof (errorstr),
 142                                                 t_errno, errno);
 143                                 (void) syslog(LOG_ERR, "%s : %s : %s",
 144                                         rpc_reg_msg, "t_getinfo failed",
 145                                         errorstr);
 146                                 SVC_DESTROY(svcxprt);
 147                                 continue;
 148                         }
 149                         if ((recvsz = __rpc_get_t_size(0, tinfo.tsdu)) == 0) {
 150                                 (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg,
 151                                         __reg_err3);
 152                                 SVC_DESTROY(svcxprt);
 153                                 continue;
 154                         }
 155                         if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) ||
 156                                 ((netid = strdup(nconf->nc_netid)) == NULL)) {
 157                                 (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg,
 158                                         __no_mem_str);
 159                                 SVC_DESTROY(svcxprt);
 160                                 break;
 161                         }
 162                         madenow = TRUE;
 163                 }
 164                 /*
 165                  * Check if this (program, version, netid) had already been
 166                  * registered.  The check may save a few RPC calls to rpcbind
 167                  */
 168                 for (pl = proglst; pl; pl = pl->p_nxt)
 169                         if ((pl->p_prognum == prognum) &&
 170                                 (pl->p_versnum == versnum) &&
 171                                 (strcmp(pl->p_netid, netid) == 0))
 172                                 break;
 173                 if (pl == NULL) { /* Not yet */
 174                         (void) rpcb_unset(prognum, versnum, nconf);
 175                 } else {
 176                         /* so that svc_reg does not call rpcb_set() */
 177                         nconf = NULL;
 178                 }
 179
 180                 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) {
 181                         (void) syslog(LOG_ERR,
 182                                 "%s couldn't register prog %d vers %d for %s",
 183                                 rpc_reg_msg, prognum, versnum, netid);
 184                         if (madenow) {
 185                                 SVC_DESTROY(svcxprt);
 186                                 free(xdrbuf);
 187                                 free(netid);
 188                         }
 189                         continue;
 190                 }
 191
 192                 pl = malloc(sizeof (struct proglst));
 193                 if (pl == NULL) {
 194                         (void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg,
 195                                         __no_mem_str);
 196                         if (madenow) {
 197                                 SVC_DESTROY(svcxprt);
 198                                 free(xdrbuf);
 199                                 free(netid);
 200                         }
 201                         break;
 202                 }
 203                 pl->p_progname = progname;
 204                 pl->p_prognum = prognum;
 205                 pl->p_versnum = versnum;
 206                 pl->p_procnum = procnum;
 207                 pl->p_inproc = inproc;
 208                 pl->p_outproc = outproc;
 209                 pl->p_transp = svcxprt;
 210                 pl->p_xdrbuf = xdrbuf;
 211                 pl->p_recvsz = recvsz;
 212                 pl->p_netid = netid;
 213                 pl->p_nxt = proglst;
 214                 proglst = pl;
 215                 done = TRUE;
 216         }
 217         __rpc_endconf(handle);
 218         (void) mutex_unlock(&proglst_lock);
 219
 220         if (done == FALSE) {
 221                 (void) syslog(LOG_ERR,
 222                         (const char *) "%s cant find suitable transport for %s",
 223                         rpc_reg_msg, nettype);
 224                 return (-1);
 225         }
 226         return (0);
 227 }
 228
 229 /*
 230  * The universal handler for the services registered using registerrpc.
 231  * It handles both the connectionless and the connection oriented cases.
 232  */
 233
 234 static void
 235 universal(struct svc_req *rqstp, SVCXPRT *transp)
 236 {
 237         rpcprog_t prog;
 238         rpcvers_t vers;
 239         rpcproc_t proc;
 240         char *outdata;
 241         char *xdrbuf;
 242         struct proglst *pl;
 243         extern mutex_t proglst_lock;
 244
 245         /*
 246          * enforce "procnum 0 is echo" convention
 247          */
 248         if (rqstp->rq_proc == NULLPROC) {
 249                 if (svc_sendreply(transp, (xdrproc_t)xdr_void, NULL) == FALSE) {
 250                         (void) syslog(LOG_ERR,
 251                                 (const char *) "svc_sendreply failed");
 252                 }
 253                 return;
 254         }
 255         prog = rqstp->rq_prog;
 256         vers = rqstp->rq_vers;
 257         proc = rqstp->rq_proc;
 258         (void) mutex_lock(&proglst_lock);
 259         for (pl = proglst; pl; pl = pl->p_nxt) {
 260                 if (pl->p_prognum == prog && pl->p_procnum == proc &&
 261                         pl->p_versnum == vers &&
 262                         (strcmp(pl->p_netid, transp->xp_netid) == 0)) {
 263                         /* decode arguments into a CLEAN buffer */
 264                         xdrbuf = pl->p_xdrbuf;
 265                         /* Zero the arguments: reqd ! */
 266                         (void) memset(xdrbuf, 0, pl->p_recvsz);
 267                         /*
 268                          * Assuming that sizeof (xdrbuf) would be enough
 269                          * for the arguments; if not then the program
 270                          * may bomb. BEWARE!
 271                          */
 272                         if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) {
 273                                 svcerr_decode(transp);
 274                                 (void) mutex_unlock(&proglst_lock);
 275                                 return;
 276                         }
 277                         outdata = (*(pl->p_progname))(xdrbuf);
 278                         if (outdata == NULL &&
 279                                 pl->p_outproc != (xdrproc_t)xdr_void) {
 280                                 /* there was an error */
 281                                 (void) mutex_unlock(&proglst_lock);
 282                                 return;
 283                         }
 284                         if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
 285                                 (void) syslog(LOG_ERR, (const char *)
 286                         "rpc: rpc_reg trouble replying to prog %d vers %d",
 287                                 prog, vers);
 288                                 (void) mutex_unlock(&proglst_lock);
 289                                 return;
 290                         }
 291                         /* free the decoded arguments */
 292                         (void) svc_freeargs(transp, pl->p_inproc, xdrbuf);
 293                         (void) mutex_unlock(&proglst_lock);
 294                         return;
 295                 }
 296         }
 297         (void) mutex_unlock(&proglst_lock);
 298         /* This should never happen */
 299         (void) syslog(LOG_ERR, (const char *)
 300                 "rpc: rpc_reg: never registered prog %d vers %d",
 301                 prog, vers);
 302 }