/* $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 christos Exp $ */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2009, Sun Microsystems, Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of Sun Microsystems, Inc. nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1986-1991 by Sun Microsystems Inc. */ /* * svc_simple.c * Simplified front end to rpc. */ /* * This interface creates a virtual listener for all the services * started through rpc_reg(). It listens on the same endpoint for * all the services and then executes the corresponding service * for the given prognum and procnum. */ #include "namespace.h" #include "reentrant.h" #include #include #include #include #include #include #include #include "un-namespace.h" #include "rpc_com.h" #include "mt_misc.h" static void universal(struct svc_req *, SVCXPRT *); static struct proglst { char *(*p_progname)(char *); rpcprog_t p_prognum; rpcvers_t p_versnum; rpcproc_t p_procnum; SVCXPRT *p_transp; char *p_netid; char *p_xdrbuf; int p_recvsz; xdrproc_t p_inproc, p_outproc; struct proglst *p_nxt; } *proglst; static const char rpc_reg_err[] = "%s: %s"; static const char rpc_reg_msg[] = "rpc_reg: "; static const char __reg_err1[] = "can't find appropriate transport"; static const char __reg_err2[] = "can't get protocol info"; static const char __reg_err3[] = "unsupported transport size"; static const char __no_mem_str[] = "out of memory"; /* * For simplified, easy to use kind of rpc interfaces. * nettype indicates the type of transport on which the service will be * listening. Used for conservation of the system resource. Only one * handle is created for all the services (actually one of each netid) * and same xdrbuf is used for same netid. The size of the arguments * is also limited by the recvsize for that transport, even if it is * a COTS transport. This may be wrong, but for cases like these, they * should not use the simplified interfaces like this. * * prognum - program number * versnum - version number * procnum - procedure number * progname - Server routine * inproc, outproc - in/out XDR procedures * nettype - nettype */ int rpc_reg(rpcprog_t prognum, rpcvers_t versnum, rpcproc_t procnum, char *(*progname)(char *), xdrproc_t inproc, xdrproc_t outproc, char *nettype) { struct netconfig *nconf; int done = FALSE; void *handle; if (procnum == NULLPROC) { warnx("%s can't reassign procedure number %u", rpc_reg_msg, NULLPROC); return (-1); } if (nettype == NULL) nettype = "netpath"; /* The default behavior */ if ((handle = __rpc_setconf(nettype)) == NULL) { warnx(rpc_reg_err, rpc_reg_msg, __reg_err1); return (-1); } /* VARIABLES PROTECTED BY proglst_lock: proglst */ mutex_lock(&proglst_lock); while ((nconf = __rpc_getconf(handle)) != NULL) { struct proglst *pl; SVCXPRT *svcxprt; int madenow; u_int recvsz; char *xdrbuf; char *netid; madenow = FALSE; svcxprt = NULL; recvsz = 0; xdrbuf = netid = NULL; for (pl = proglst; pl; pl = pl->p_nxt) { if (strcmp(pl->p_netid, nconf->nc_netid) == 0) { svcxprt = pl->p_transp; xdrbuf = pl->p_xdrbuf; recvsz = pl->p_recvsz; netid = pl->p_netid; break; } } if (svcxprt == NULL) { struct __rpc_sockinfo si; svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0); if (svcxprt == NULL) continue; if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) { warnx(rpc_reg_err, rpc_reg_msg, __reg_err2); SVC_DESTROY(svcxprt); continue; } recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0); if (recvsz == 0) { warnx(rpc_reg_err, rpc_reg_msg, __reg_err3); SVC_DESTROY(svcxprt); continue; } if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) || ((netid = strdup(nconf->nc_netid)) == NULL)) { warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); free(xdrbuf); free(netid); SVC_DESTROY(svcxprt); break; } madenow = TRUE; } /* * Check if this (program, version, netid) had already been * registered. The check may save a few RPC calls to rpcbind */ for (pl = proglst; pl; pl = pl->p_nxt) if ((pl->p_prognum == prognum) && (pl->p_versnum == versnum) && (strcmp(pl->p_netid, netid) == 0)) break; if (pl == NULL) { /* Not yet */ (void) rpcb_unset(prognum, versnum, nconf); } else { /* so that svc_reg does not call rpcb_set() */ nconf = NULL; } if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) { warnx("%s couldn't register prog %u vers %u for %s", rpc_reg_msg, (unsigned)prognum, (unsigned)versnum, netid); if (madenow) { SVC_DESTROY(svcxprt); free(xdrbuf); free(netid); } continue; } pl = malloc(sizeof (struct proglst)); if (pl == NULL) { warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str); if (madenow) { SVC_DESTROY(svcxprt); free(xdrbuf); free(netid); } break; } pl->p_progname = progname; pl->p_prognum = prognum; pl->p_versnum = versnum; pl->p_procnum = procnum; pl->p_inproc = inproc; pl->p_outproc = outproc; pl->p_transp = svcxprt; pl->p_xdrbuf = xdrbuf; pl->p_recvsz = recvsz; pl->p_netid = netid; pl->p_nxt = proglst; proglst = pl; done = TRUE; } __rpc_endconf(handle); mutex_unlock(&proglst_lock); if (done == FALSE) { warnx("%s can't find suitable transport for %s", rpc_reg_msg, nettype); return (-1); } return (0); } /* * The universal handler for the services registered using registerrpc. * It handles both the connectionless and the connection oriented cases. */ static void universal(struct svc_req *rqstp, SVCXPRT *transp) { rpcprog_t prog; rpcvers_t vers; rpcproc_t proc; char *outdata; char *xdrbuf; struct proglst *pl; /* * enforce "procnum 0 is echo" convention */ if (rqstp->rq_proc == NULLPROC) { if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) == FALSE) { warnx("svc_sendreply failed"); } return; } prog = rqstp->rq_prog; vers = rqstp->rq_vers; proc = rqstp->rq_proc; mutex_lock(&proglst_lock); for (pl = proglst; pl; pl = pl->p_nxt) if (pl->p_prognum == prog && pl->p_procnum == proc && pl->p_versnum == vers && (strcmp(pl->p_netid, transp->xp_netid) == 0)) { /* decode arguments into a CLEAN buffer */ xdrbuf = pl->p_xdrbuf; /* Zero the arguments: reqd ! */ (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz); /* * Assuming that sizeof (xdrbuf) would be enough * for the arguments; if not then the program * may bomb. BEWARE! */ if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) { svcerr_decode(transp); mutex_unlock(&proglst_lock); return; } outdata = (*(pl->p_progname))(xdrbuf); if (outdata == NULL && pl->p_outproc != (xdrproc_t) xdr_void){ /* there was an error */ mutex_unlock(&proglst_lock); return; } if (!svc_sendreply(transp, pl->p_outproc, outdata)) { warnx( "rpc: rpc_reg trouble replying to prog %u vers %u", (unsigned)prog, (unsigned)vers); mutex_unlock(&proglst_lock); return; } /* free the decoded arguments */ (void)svc_freeargs(transp, pl->p_inproc, xdrbuf); mutex_unlock(&proglst_lock); return; } mutex_unlock(&proglst_lock); /* This should never happen */ warnx("rpc: rpc_reg: never registered prog %u vers %u", (unsigned)prog, (unsigned)vers); return; }