cmd/rpcbind/pmap_svc.c

	pmap_svc.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * pmap_svc.c
 * The server procedure for the version 2 portmaper.
 * All the portmapper related interface from the portmap side.
 */

#ifdef PORTMAP
#include <stdio.h>
#include <alloca.h>
#include <ucred.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/rpcb_prot.h>
#include "rpcbind.h"

#ifdef RPCBIND_DEBUG
#include <netdir.h>
#endif

static PMAPLIST *find_service_pmap();
static bool_t pmapproc_change();
static bool_t pmapproc_getport();
static bool_t pmapproc_dump();

/*
 * Called for all the version 2 inquiries.
 */
void
pmap_service(rqstp, xprt)
    register struct svc_req *rqstp;
    register SVCXPRT *xprt;
{
    rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
    switch (rqstp->rq_proc) {
    case PMAPPROC_NULL:
        /*
         * Null proc call
         */
#ifdef RPCBIND_DEBUG
        fprintf(stderr, "PMAPPROC_NULL\n");
#endif
        PMAP_CHECK(xprt, rqstp->rq_proc);

        if ((!svc_sendreply(xprt, (xdrproc_t)xdr_void, NULL)) &&
            debugging) {
            if (doabort) {
                rpcbind_abort();
            }
        }
        break;

    case PMAPPROC_SET:
        /*
         * Set a program, version to port mapping
         */
        pmapproc_change(rqstp, xprt, rqstp->rq_proc);
        break;

    case PMAPPROC_UNSET:
        /*
         * Remove a program, version to port mapping.
         */
        pmapproc_change(rqstp, xprt, rqstp->rq_proc);
        break;

    case PMAPPROC_GETPORT:
        /*
         * Lookup the mapping for a program, version and return its
         * port number.
         */
        pmapproc_getport(rqstp, xprt);
        break;

    case PMAPPROC_DUMP:
        /*
         * Return the current set of mapped program, version
         */
#ifdef RPCBIND_DEBUG
        fprintf(stderr, "PMAPPROC_DUMP\n");
#endif
        PMAP_CHECK(xprt, rqstp->rq_proc);
        pmapproc_dump(rqstp, xprt);
        break;

    case PMAPPROC_CALLIT:
        /*
         * Calls a procedure on the local machine. If the requested
         * procedure is not registered this procedure does not return
         * error information!!
         * This procedure is only supported on rpc/udp and calls via
         * rpc/udp. It passes null authentication parameters.
         */
        rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
        break;

    default:
        PMAP_CHECK(xprt, rqstp->rq_proc);
        svcerr_noproc(xprt);
        break;
    }
}

/*
 * returns the item with the given program, version number. If that version
 * number is not found, it returns the item with that program number, so that
 * the port number is now returned to the caller. The caller when makes a
 * call to this program, version number, the call will fail and it will
 * return with PROGVERS_MISMATCH. The user can then determine the highest
 * and the lowest version number for this program using clnt_geterr() and
 * use those program version numbers.
 */
static PMAPLIST *
find_service_pmap(prog, vers, prot)
    ulong_t prog;
    ulong_t vers;
    ulong_t prot;
{
    register PMAPLIST *hit = NULL;
    register PMAPLIST *pml;

    for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
        if ((pml->pml_map.pm_prog != prog) ||
            (pml->pml_map.pm_prot != prot))
            continue;
        hit = pml;
        if (pml->pml_map.pm_vers == vers)
            break;
    }
    return (hit);
}

extern char *getowner(SVCXPRT *xprt, char *);

/*ARGSUSED*/
static bool_t
pmapproc_change(rqstp, xprt, op)
    struct svc_req *rqstp;
    register SVCXPRT *xprt;
    unsigned long op;
{
    PMAP reg;
    RPCB rpcbreg;
    int ans;
    struct sockaddr_in *who;
    extern bool_t map_set(), map_unset();
    char owner[64];

    if (!svc_getargs(xprt, (xdrproc_t)xdr_pmap, (char *)&reg)) {
        svcerr_decode(xprt);
        return (FALSE);
    }
    who = svc_getcaller(xprt);

#ifdef RPCBIND_DEBUG
    fprintf(stderr, "%s request for (%lu, %lu) : ",
        op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
        reg.pm_prog, reg.pm_vers);
#endif

    /* Don't allow unset/set from remote. */
    if (!localxprt(xprt, B_TRUE)) {
        ans = FALSE;
        goto done_change;
    }

    rpcbreg.r_owner = getowner(xprt, owner);

    if ((op == PMAPPROC_SET) && (reg.pm_port < IPPORT_RESERVED) &&
        (ntohs(who->sin_port) >= IPPORT_RESERVED)) {
        ans = FALSE;
        goto done_change;
    }
    rpcbreg.r_prog = reg.pm_prog;
    rpcbreg.r_vers = reg.pm_vers;

    if (op == PMAPPROC_SET) {
        char buf[32];

        sprintf(buf, "0.0.0.0.%d.%d", (reg.pm_port >> 8) & 0xff,
            reg.pm_port & 0xff);
        rpcbreg.r_addr = buf;
        if (reg.pm_prot == IPPROTO_UDP) {
            rpcbreg.r_netid = udptrans;
        } else if (reg.pm_prot == IPPROTO_TCP) {
            rpcbreg.r_netid = tcptrans;
        } else {
            ans = FALSE;
            goto done_change;
        }
        ans = map_set(&rpcbreg, rpcbreg.r_owner);
    } else if (op == PMAPPROC_UNSET) {
        bool_t ans1, ans2;

        rpcbreg.r_addr = NULL;
        rpcbreg.r_netid = tcptrans;
        ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
        rpcbreg.r_netid = udptrans;
        ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
        ans = ans1 || ans2;
    } else {
        ans = FALSE;
    }
done_change:
    PMAP_LOG(ans, xprt, op, reg.pm_prog);

    if ((!svc_sendreply(xprt, (xdrproc_t)xdr_long, (caddr_t)&ans)) &&
        debugging) {
        fprintf(stderr, "portmap: svc_sendreply\n");
        if (doabort) {
            rpcbind_abort();
        }
    }
#ifdef RPCBIND_DEBUG
    fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
#endif
    if (op == PMAPPROC_SET)
        rpcbs_set(RPCBVERS_2_STAT, ans);
    else
        rpcbs_unset(RPCBVERS_2_STAT, ans);
    return (TRUE);
}

/* ARGSUSED */
static bool_t
pmapproc_getport(rqstp, xprt)
    struct svc_req *rqstp;
    register SVCXPRT *xprt;
{
    PMAP reg;
    int port = 0;
    PMAPLIST *fnd;
#ifdef RPCBIND_DEBUG
    char *uaddr;
#endif

    if (!svc_getargs(xprt, (xdrproc_t)xdr_pmap, (char *)&reg)) {
        svcerr_decode(xprt);
        return (FALSE);
    }
    PMAP_CHECK_RET(xprt, rqstp->rq_proc, FALSE);

#ifdef RPCBIND_DEBUG
    uaddr =  taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
                svc_getrpccaller(xprt));
    fprintf(stderr, "PMAP_GETPORT request for (%lu, %lu, %s) from %s :",
        reg.pm_prog, reg.pm_vers,
        reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
    free(uaddr);
#endif
    fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
    if (fnd) {
        char serveuaddr[32], *ua;
        int h1, h2, h3, h4, p1, p2;
        char *netid;

        if (reg.pm_prot == IPPROTO_UDP) {
            ua = udp_uaddr;
            netid = udptrans;
        } else {
            ua = tcp_uaddr; /* To get the len */
            netid = tcptrans;
        }
        if (ua == NULL) {
            goto sendreply;
        }
        if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
                &h4, &p1, &p2) == 6) {
            p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
            p2 = (fnd->pml_map.pm_port) & 0xff;
            sprintf(serveuaddr, "%d.%d.%d.%d.%d.%d",
                h1, h2, h3, h4, p1, p2);
            if (is_bound(netid, serveuaddr)) {
                port = fnd->pml_map.pm_port;
            } else { /* this service is dead; delete it */
                delete_prog(reg.pm_prog);
            }
        }
    }
sendreply:
    if ((!svc_sendreply(xprt, (xdrproc_t)xdr_long, (caddr_t)&port)) &&
            debugging) {
        (void) fprintf(stderr, "portmap: svc_sendreply\n");
        if (doabort) {
            rpcbind_abort();
        }
    }
#ifdef RPCBIND_DEBUG
    fprintf(stderr, "port = %d\n", port);
#endif
    rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
        reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
        port ? udptrans : "");

    return (TRUE);
}

/* ARGSUSED */
static bool_t
pmapproc_dump(rqstp, xprt)
    struct svc_req *rqstp;
    register SVCXPRT *xprt;
{
    if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
        svcerr_decode(xprt);
        return (FALSE);
    }
    if ((!svc_sendreply(xprt, (xdrproc_t)xdr_pmaplist_ptr,
            (caddr_t)&list_pml)) && debugging) {
        (void) fprintf(stderr, "portmap: svc_sendreply\n");
        if (doabort) {
            rpcbind_abort();
        }
    }
    return (TRUE);
}

/*
 * Is the transport local?  The original rpcbind code tried to
 * figure out all the network interfaces but there can be a nearly
 * infinite number of network interfaces.  And the number of interfaces can
 * vary over time.
 *
 * Note that when we get here, we've already establised that we're
 * dealing with a TCP/IP endpoint.
 */
boolean_t
localxprt(SVCXPRT *transp, boolean_t forceipv4)
{
    struct sockaddr_gen *sgen = svc_getgencaller(transp);

    switch (SGFAM(sgen)) {
    case AF_INET:
        break;
    case AF_INET6:
        if (forceipv4)
            return (B_FALSE);
        break;
    default:
        return (B_FALSE);
    }

    /*
     * Get the peer's uid; if it is known it is sufficiently
     * authenticated and considered local.  The magic behind this
     * call is all in libnsl.
     */
    return (rpcb_caller_uid(transp) != -1);
}
#endif /* PORTMAP */