lib/libc/rpc/svc_simple.c

   1 /*      $NetBSD: svc_simple.c,v 1.30 2008/04/25 17:44:44 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
  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 <sys/cdefs.h>
  50 #if defined(LIBC_SCCS) && !defined(lint)
  51 __RCSID("$NetBSD: svc_simple.c,v 1.30 2008/04/25 17:44:44 christos Exp $");
  52 #endif
  53
  54 #include "namespace.h"
  55 #include "reentrant.h"
  56 #include <sys/types.h>
  57 #include <rpc/rpc.h>
  58 #include <rpc/nettype.h>
  59 #include <assert.h>
  60 #include <err.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64
  65 #include "rpc_internal.h"
  66
  67 #ifdef __weak_alias
  68 __weak_alias(rpc_reg,_rpc_reg)
  69 #endif
  70
  71 static void universal __P((struct svc_req *, SVCXPRT *));
  72
  73 static struct proglst {
  74         char *(*p_progname) __P((char *));
  75         rpcprog_t p_prognum;
  76         rpcvers_t p_versnum;
  77         rpcproc_t p_procnum;
  78         SVCXPRT *p_transp;
  79         char *p_netid;
  80         char *p_xdrbuf;
  81         int p_recvsz;
  82         xdrproc_t p_inproc, p_outproc;
  83         struct proglst *p_nxt;
  84 } *proglst;
  85
  86 static const char rpc_reg_err[] = "%s: %s";
  87 static const char rpc_reg_msg[] = "rpc_reg: ";
  88 static const char __reg_err1[] = "can't find appropriate transport";
  89 static const char __reg_err2[] = "can't get protocol info";
  90 static const char __reg_err3[] = "unsupported transport size";
  91 static const char __no_mem_str[] = "out of memory";
  92
  93 /*
  94  * For simplified, easy to use kind of rpc interfaces.
  95  * nettype indicates the type of transport on which the service will be
  96  * listening. Used for conservation of the system resource. Only one
  97  * handle is created for all the services (actually one of each netid)
  98  * and same xdrbuf is used for same netid. The size of the arguments
  99  * is also limited by the recvsize for that transport, even if it is
 100  * a COTS transport. This may be wrong, but for cases like these, they
 101  * should not use the simplified interfaces like this.
 102  */
 103
 104 int
 105 rpc_reg(prognum, versnum, procnum, progname, inproc, outproc, nettype)
 106         rpcprog_t prognum;                      /* program number */
 107         rpcvers_t versnum;                      /* version number */
 108         rpcproc_t procnum;                      /* procedure number */
 109         char *(*progname) __P((char *)); /* Server routine */
 110         xdrproc_t inproc, outproc;      /* in/out XDR procedures */
 111         char *nettype;                  /* nettype */
 112 {
 113         struct netconfig *nconf;
 114         int done = FALSE;
 115         void *handle;
 116 #ifdef _REENTRANT
 117         extern mutex_t proglst_lock;
 118 #endif
 119
 120         if (procnum == NULLPROC) {
 121                 warnx("%s can't reassign procedure number %u", rpc_reg_msg,
 122                         NULLPROC);
 123                 return (-1);
 124         }
 125
 126         if (nettype == NULL)
 127                 nettype = __UNCONST("netpath"); /* The default behavior */
 128         if ((handle = __rpc_setconf(nettype)) == NULL) {
 129                 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1);
 130                 return (-1);
 131         }
 132 /* VARIABLES PROTECTED BY proglst_lock: proglst */
 133         mutex_lock(&proglst_lock);
 134         while ((nconf = __rpc_getconf(handle)) != NULL) {
 135                 struct proglst *pl;
 136                 SVCXPRT *svcxprt;
 137                 int madenow;
 138                 u_int recvsz;
 139                 char *xdrbuf;
 140                 char *netid;
 141
 142                 madenow = FALSE;
 143                 svcxprt = NULL;
 144                 recvsz = 0;
 145                 xdrbuf = NULL;
 146                 netid = NULL;
 147                 for (pl = proglst; pl; pl = pl->p_nxt)
 148                         if (strcmp(pl->p_netid, nconf->nc_netid) == 0) {
 149                                 svcxprt = pl->p_transp;
 150                                 xdrbuf = pl->p_xdrbuf;
 151                                 recvsz = pl->p_recvsz;
 152                                 netid = pl->p_netid;
 153                                 break;
 154                         }
 155
 156                 if (svcxprt == NULL) {
 157                         struct __rpc_sockinfo si;
 158
 159                         svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
 160                         if (svcxprt == NULL)
 161                                 continue;
 162                         if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) {
 163                                 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2);
 164                                 SVC_DESTROY(svcxprt);
 165                                 continue;
 166                         }
 167                         recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0);
 168                         if (recvsz == 0) {
 169                                 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3);
 170                                 SVC_DESTROY(svcxprt);
 171                                 continue;
 172                         }
 173                         if (((xdrbuf = malloc((size_t)recvsz)) == NULL) ||
 174                                 ((netid = strdup(nconf->nc_netid)) == NULL)) {
 175                                 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str);
 176                                 if (xdrbuf != NULL)
 177                                         free(xdrbuf);
 178                                 if (netid != NULL)
 179                                         free(netid);
 180                                 SVC_DESTROY(svcxprt);
 181                                 break;
 182                         }
 183                         madenow = TRUE;
 184                 }
 185                 /*
 186                  * Check if this (program, version, netid) had already been
 187                  * registered.  The check may save a few RPC calls to rpcbind
 188                  */
 189                 for (pl = proglst; pl; pl = pl->p_nxt)
 190                         if ((pl->p_prognum == prognum) &&
 191                                 (pl->p_versnum == versnum) &&
 192                                 (strcmp(pl->p_netid, netid) == 0))
 193                                 break;
 194                 if (pl == NULL) { /* Not yet */
 195                         (void) rpcb_unset(prognum, versnum, nconf);
 196                 } else {
 197                         /* so that svc_reg does not call rpcb_set() */
 198                         nconf = NULL;
 199                 }
 200
 201                 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) {
 202                         warnx("%s couldn't register prog %u vers %u for %s",
 203                                 rpc_reg_msg, (unsigned)prognum,
 204                                 (unsigned)versnum, netid);
 205                         if (madenow) {
 206                                 SVC_DESTROY(svcxprt);
 207                                 free(xdrbuf);
 208                                 free(netid);
 209                         }
 210                         continue;
 211                 }
 212
 213                 pl = malloc(sizeof(*pl));
 214                 if (pl == NULL) {
 215                         warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str);
 216                         if (madenow) {
 217                                 SVC_DESTROY(svcxprt);
 218                                 free(xdrbuf);
 219                                 free(netid);
 220                         }
 221                         break;
 222                 }
 223                 pl->p_progname = progname;
 224                 pl->p_prognum = prognum;
 225                 pl->p_versnum = versnum;
 226                 pl->p_procnum = procnum;
 227                 pl->p_inproc = inproc;
 228                 pl->p_outproc = outproc;
 229                 pl->p_transp = svcxprt;
 230                 pl->p_xdrbuf = xdrbuf;
 231                 pl->p_recvsz = recvsz;
 232                 pl->p_netid = netid;
 233                 pl->p_nxt = proglst;
 234                 proglst = pl;
 235                 done = TRUE;
 236         }
 237         __rpc_endconf(handle);
 238         mutex_unlock(&proglst_lock);
 239
 240         if (done == FALSE) {
 241                 warnx("%s cant find suitable transport for %s",
 242                         rpc_reg_msg, nettype);
 243                 return (-1);
 244         }
 245         return (0);
 246 }
 247
 248 /*
 249  * The universal handler for the services registered using registerrpc.
 250  * It handles both the connectionless and the connection oriented cases.
 251  */
 252
 253 static void
 254 universal(rqstp, transp)
 255         struct svc_req *rqstp;
 256         SVCXPRT *transp;
 257 {
 258         rpcprog_t prog;
 259         rpcvers_t vers;
 260         rpcproc_t proc;
 261         char *outdata;
 262         char *xdrbuf;
 263         struct proglst *pl;
 264 #ifdef _REENTRANT
 265         extern mutex_t proglst_lock;
 266 #endif
 267
 268         _DIAGASSERT(rqstp != NULL);
 269         _DIAGASSERT(transp != NULL);
 270
 271         /*
 272          * enforce "procnum 0 is echo" convention
 273          */
 274         if (rqstp->rq_proc == NULLPROC) {
 275                 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) ==
 276                     FALSE) {
 277                         warnx("svc_sendreply failed");
 278                 }
 279                 return;
 280         }
 281         prog = rqstp->rq_prog;
 282         vers = rqstp->rq_vers;
 283         proc = rqstp->rq_proc;
 284         mutex_lock(&proglst_lock);
 285         for (pl = proglst; pl; pl = pl->p_nxt)
 286                 if (pl->p_prognum == prog && pl->p_procnum == proc &&
 287                         pl->p_versnum == vers &&
 288                         (strcmp(pl->p_netid, transp->xp_netid) == 0)) {
 289                         /* decode arguments into a CLEAN buffer */
 290                         xdrbuf = pl->p_xdrbuf;
 291                         /* Zero the arguments: reqd ! */
 292                         (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz);
 293                         /*
 294                          * Assuming that sizeof (xdrbuf) would be enough
 295                          * for the arguments; if not then the program
 296                          * may bomb. BEWARE!
 297                          */
 298                         if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) {
 299                                 svcerr_decode(transp);
 300                                 mutex_unlock(&proglst_lock);
 301                                 return;
 302                         }
 303                         outdata = (*(pl->p_progname))(xdrbuf);
 304                         if (outdata == NULL &&
 305                                 pl->p_outproc != (xdrproc_t) xdr_void){
 306                                 /* there was an error */
 307                                 mutex_unlock(&proglst_lock);
 308                                 return;
 309                         }
 310                         if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
 311                                 warnx(
 312                         "rpc: rpc_reg trouble replying to prog %u vers %u",
 313                                 (unsigned)prog, (unsigned)vers);
 314                                 mutex_unlock(&proglst_lock);
 315                                 return;
 316                         }
 317                         /* free the decoded arguments */
 318                         (void) svc_freeargs(transp, pl->p_inproc, xdrbuf);
 319                         mutex_unlock(&proglst_lock);
 320                         return;
 321                 }
 322         mutex_unlock(&proglst_lock);
 323         /* This should never happen */
 324         warnx("rpc: rpc_reg: never registered prog %u vers %u",
 325                 (unsigned)prog, (unsigned)vers);
 326         return;
 327 }