lib/libc/rpc/svc_simple.c

   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 }