Add quirk for the Samsung YP-U3.

[dragonfly.git] / usr.sbin / portmap / portmap.c

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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) 1990, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)portmap.c        8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.sbin/portmap/portmap.c,v 1.10.2.3 2002/05/06 18:18:21 dwmalone Exp $
 * $DragonFly: src/usr.sbin/portmap/portmap.c,v 1.4 2004/03/30 02:58:59 cpressey Exp $
 */

/*
@(#)portmap.c   2.3 88/08/11 4.0 RPCSRC
static char sccsid[] = "@(#)portmap.c 1.32 87/08/06 Copyr 1984 Sun Micro";
*/

/*
 * portmap.c, Implements the program,version to port number mapping for
 * rpc.
 */

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/signal.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>

#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include "pmap_check.h"

static void reg_service(struct svc_req *, SVCXPRT *);
static void reap(int);
static void callit(struct svc_req *, SVCXPRT *);
static void usage(void);

struct pmaplist *pmaplist;
int debugging = 0;

int
main(int argc, char **argv)
{
        SVCXPRT *xprt;
        int sock, c;
        char **hosts = NULL;
        int nhosts = 0;
        struct sockaddr_in addr;
        int len = sizeof(struct sockaddr_in);
        struct pmaplist *pml;

        while ((c = getopt(argc, argv, "dvh:")) != -1) {
                switch (c) {

                case 'd':
                        debugging = 1;
                        break;

                case 'v':
                        verboselog = 1;
                        break;

                case 'h':
                        ++nhosts;
                        hosts = realloc(hosts, nhosts * sizeof(char *));
                        hosts[nhosts - 1] = optarg;
                        break;

                default:
                        usage();
                }
        }

        if (!debugging && daemon(0, 0))
                err(1, "fork");

        openlog("portmap", debugging ? LOG_PID | LOG_PERROR : LOG_PID,
            LOG_DAEMON);

        bzero(&addr, sizeof(addr));
        addr.sin_family = AF_INET;
        addr.sin_port = htons(PMAPPORT);

        /*
         * If no hosts were specified, just bind to INADDR_ANY.  Otherwise
         * make sure 127.0.0.1 is added to the list.
         */
        ++nhosts;
        hosts = realloc(hosts, nhosts * sizeof(char *));
        if (nhosts == 1)
                hosts[0] = "0.0.0.0";
        else
                hosts[nhosts - 1] = "127.0.0.1";

        /*
         * Add UDP socket(s) - bind to specific IPs if asked to
         */
        while (nhosts > 0) {
            --nhosts;

            if (!inet_aton(hosts[nhosts], &addr.sin_addr)) {
                    syslog(LOG_ERR, "bad IP address: %s", hosts[nhosts]);
                    exit(1);
            }
            if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
                    syslog(LOG_ERR, "cannot create udp socket: %m");
                    exit(1);
            }

            if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
                    syslog(LOG_ERR, "cannot bind udp: %m");
                    exit(1);
            }

            if ((xprt = svcudp_create(sock)) == (SVCXPRT *)NULL) {
                    syslog(LOG_ERR, "couldn't do udp_create");
                    exit(1);
            }
        }
        /* make an entry for ourself */
        pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
        pml->pml_next = 0;
        pml->pml_map.pm_prog = PMAPPROG;
        pml->pml_map.pm_vers = PMAPVERS;
        pml->pml_map.pm_prot = IPPROTO_UDP;
        pml->pml_map.pm_port = PMAPPORT;
        pmaplist = pml;

        /*
         * Add TCP socket
         */
        addr.sin_addr.s_addr = 0;
        if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
                syslog(LOG_ERR, "cannot create tcp socket: %m");
                exit(1);
        }
        if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
                syslog(LOG_ERR, "cannot bind tcp: %m");
                exit(1);
        }
        if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE))
            == (SVCXPRT *)NULL) {
                syslog(LOG_ERR, "couldn't do tcp_create");
                exit(1);
        }
        /* make an entry for ourself */
        pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
        pml->pml_map.pm_prog = PMAPPROG;
        pml->pml_map.pm_vers = PMAPVERS;
        pml->pml_map.pm_prot = IPPROTO_TCP;
        pml->pml_map.pm_port = PMAPPORT;
        pml->pml_next = pmaplist;
        pmaplist = pml;

        svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE);

        /* additional initializations */
        check_startup();
        signal(SIGCHLD, reap);
        svc_run();
        syslog(LOG_ERR, "svc_run returned unexpectedly");
        abort();
}

static void
usage(void)
{
        fprintf(stderr, "usage: portmap [-dv] [-h bindip]\n");
        exit(1);
}

#ifndef lint
/* need to override perror calls in rpc library */
void
perror(const char *what)
{
        syslog(LOG_ERR, "%s: %m", what);
}
#endif

static struct pmaplist *
find_service(u_long prog, u_long vers, u_long prot)
{
        struct pmaplist *hit = NULL;
        struct pmaplist *pml;

        for (pml = pmaplist; 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);
}

/*
 * 1 OK, 0 not
 */
static void
reg_service(struct svc_req *rqstp, SVCXPRT *xprt)
{
        struct pmap reg;
        struct pmaplist *pml, *prevpml, *fnd;
        int ans, port;
        caddr_t t;

        /*
         * Later wrappers change the logging severity on the fly. Reset to
         * defaults before handling the next request.
         */
        allow_severity = LOG_INFO;
        deny_severity = LOG_WARNING;

        if (debugging)
                fprintf(stderr, "server: about to do a switch\n");
        switch (rqstp->rq_proc) {

        case PMAPPROC_NULL:
                /*
                 * Null proc call
                 */
                /* remote host authorization check */
                check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
                if (!svc_sendreply(xprt, xdr_void, (caddr_t)0) && debugging) {
                        abort();
                }
                break;

        case PMAPPROC_SET:
                /*
                 * Set a program,version to port mapping
                 */
                if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg))
                        svcerr_decode(xprt);
                else {
                        /* reject non-local requests, protect priv. ports */
                        if (!check_setunset(svc_getcaller(xprt),
                            rqstp->rq_proc, reg.pm_prog, reg.pm_port)) {
                                ans = 0;
                                goto done;
                        }
                        /*
                         * check to see if already used
                         * find_service returns a hit even if
                         * the versions don't match, so check for it
                         */
                        fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
                        if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) {
                                if (fnd->pml_map.pm_port == reg.pm_port) {
                                        ans = 1;
                                        goto done;
                                }
                                else {
                                        ans = 0;
                                        goto done;
                                }
                        } else {
                                /*
                                 * add to END of list
                                 */
                                pml = (struct pmaplist *)
                                    malloc((u_int)sizeof(struct pmaplist));
                                pml->pml_map = reg;
                                pml->pml_next = 0;
                                if (pmaplist == 0) {
                                        pmaplist = pml;
                                } else {
                                        for (fnd= pmaplist; fnd->pml_next != 0;
                                            fnd = fnd->pml_next);
                                        fnd->pml_next = pml;
                                }
                                ans = 1;
                        }
                done:
                        if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
                            debugging) {
                                fprintf(stderr, "svc_sendreply\n");
                                abort();
                        }
                }
                break;

        case PMAPPROC_UNSET:
                /*
                 * Remove a program,version to port mapping.
                 */
                if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg))
                        svcerr_decode(xprt);
                else {
                        ans = 0;
                        /* reject non-local requests */
                        if (!check_setunset(svc_getcaller(xprt),
                            rqstp->rq_proc, reg.pm_prog, (u_long) 0))
                                goto done;
                        for (prevpml = NULL, pml = pmaplist; pml != NULL; ) {
                                if ((pml->pml_map.pm_prog != reg.pm_prog) ||
                                        (pml->pml_map.pm_vers != reg.pm_vers)) {
                                        /* both pml & prevpml move forwards */
                                        prevpml = pml;
                                        pml = pml->pml_next;
                                        continue;
                                }
                                /* found it; pml moves forward, prevpml stays */
                                /* privileged port check */
                                if (!check_privileged_port(svc_getcaller(xprt),
                                    rqstp->rq_proc,
                                    reg.pm_prog,
                                    pml->pml_map.pm_port)) {
                                        ans = 0;
                                        break;
                                }
                                ans = 1;
                                t = (caddr_t)pml;
                                pml = pml->pml_next;
                                if (prevpml == NULL)
                                        pmaplist = pml;
                                else
                                        prevpml->pml_next = pml;
                                free(t);
                        }
                        if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
                            debugging) {
                                fprintf(stderr, "svc_sendreply\n");
                                abort();
                        }
                }
                break;

        case PMAPPROC_GETPORT:
                /*
                 * Lookup the mapping for a program,version and return its port
                 */
                if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg))
                        svcerr_decode(xprt);
                else {
                        /* remote host authorization check */
                        if (!check_default(svc_getcaller(xprt),
                            rqstp->rq_proc,
                            reg.pm_prog)) {
                                ans = 0;
                                goto done;
                        }
                        fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
                        if (fnd)
                                port = fnd->pml_map.pm_port;
                        else
                                port = 0;
                        if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) &&
                            debugging) {
                                fprintf(stderr, "svc_sendreply\n");
                                abort();
                        }
                }
                break;

        case PMAPPROC_DUMP:
                /*
                 * Return the current set of mapped program,version
                 */
                if (!svc_getargs(xprt, xdr_void, NULL))
                        svcerr_decode(xprt);
                else {
                        /* remote host authorization check */
                        struct pmaplist *p;
                        if (!check_default(svc_getcaller(xprt),
                            rqstp->rq_proc, (u_long) 0)) {
                                p = 0;  /* send empty list */
                        } else {
                                p = pmaplist;
                        }
                        if ((!svc_sendreply(xprt, xdr_pmaplist,
                            (caddr_t)&p)) && debugging) {
                                fprintf(stderr, "svc_sendreply\n");
                                abort();
                        }
                }
                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.
                 */
                callit(rqstp, xprt);
                break;

        default:
                /* remote host authorization check */
                check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
                svcerr_noproc(xprt);
                break;
        }
}


/*
 * Stuff for the rmtcall service
 */
#define ARGSIZE 9000

struct encap_parms {
        u_int arglen;
        char *args;
};

static bool_t
xdr_encap_parms(XDR *xdrs, struct encap_parms *epp)
{
        return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
}

struct rmtcallargs {
        u_long  rmt_prog;
        u_long  rmt_vers;
        u_long  rmt_port;
        u_long  rmt_proc;
        struct encap_parms rmt_args;
};

static bool_t
xdr_rmtcall_args(XDR *xdrs, struct rmtcallargs *cap)
{
        /* does not get a port number */
        if (xdr_u_long(xdrs, &(cap->rmt_prog)) &&
            xdr_u_long(xdrs, &(cap->rmt_vers)) &&
            xdr_u_long(xdrs, &(cap->rmt_proc))) {
                return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
        }
        return (FALSE);
}

static bool_t
xdr_rmtcall_result(XDR *xdrs, struct rmtcallargs *cap)
{
        if (xdr_u_long(xdrs, &(cap->rmt_port)))
                return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
        return (FALSE);
}

/*
 * only worries about the struct encap_parms part of struct rmtcallargs.
 * The arglen must already be set!!
 */
static bool_t
xdr_opaque_parms(XDR *xdrs, struct rmtcallargs *cap)
{
        return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen));
}

/*
 * This routine finds and sets the length of incoming opaque paraters
 * and then calls xdr_opaque_parms.
 */
static bool_t
xdr_len_opaque_parms(XDR *xdrs, struct rmtcallargs *cap)
{
        u_int beginpos, lowpos, highpos, currpos, pos;

        beginpos = lowpos = pos = xdr_getpos(xdrs);
        highpos = lowpos + ARGSIZE;
        while ((int)(highpos - lowpos) >= 0) {
                currpos = (lowpos + highpos) / 2;
                if (xdr_setpos(xdrs, currpos)) {
                        pos = currpos;
                        lowpos = currpos + 1;
                } else {
                        highpos = currpos - 1;
                }
        }
        xdr_setpos(xdrs, beginpos);
        cap->rmt_args.arglen = pos - beginpos;
        return (xdr_opaque_parms(xdrs, cap));
}

/*
 * Call a remote procedure service
 * This procedure is very quiet when things go wrong.
 * The proc is written to support broadcast rpc.  In the broadcast case,
 * a machine should shut-up instead of complain, less the requestor be
 * overrun with complaints at the expense of not hearing a valid reply ...
 *
 * This now forks so that the program & process that it calls can call
 * back to the portmapper.
 */
static void
callit(struct svc_req *rqstp, SVCXPRT *xprt)
{
        struct rmtcallargs a;
        struct pmaplist *pml;
        u_short port;
        struct sockaddr_in me;
        int pid, so = -1;
        CLIENT *client;
        struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred;
        struct timeval timeout;
        char buf[ARGSIZE];

        timeout.tv_sec = 5;
        timeout.tv_usec = 0;
        a.rmt_args.args = buf;
        if (!svc_getargs(xprt, xdr_rmtcall_args, (caddr_t)&a))
                return;
        /* host and service access control */
        if (!check_callit(svc_getcaller(xprt),
            rqstp->rq_proc, a.rmt_prog, a.rmt_proc))
                return;
        if ((pml = find_service(a.rmt_prog, a.rmt_vers,
            (u_long)IPPROTO_UDP)) == NULL)
                return;
        /*
         * fork a child to do the work.  Parent immediately returns.
         * Child exits upon completion.
         */
        if ((pid = fork()) != 0) {
                if (pid < 0)
                        syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m",
                            a.rmt_prog);
                return;
        }
        port = pml->pml_map.pm_port;
        get_myaddress(&me);
        me.sin_port = htons(port);
        client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &so);
        if (client != (CLIENT *)NULL) {
                if (rqstp->rq_cred.oa_flavor == AUTH_UNIX) {
                        client->cl_auth = authunix_create(au->aup_machname,
                           au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids);
                }
                a.rmt_port = (u_long)port;
                if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a,
                    xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS) {
                        svc_sendreply(xprt, xdr_rmtcall_result, (caddr_t)&a);
                }
                AUTH_DESTROY(client->cl_auth);
                clnt_destroy(client);
        }
        close(so);
        exit(0);
}

static void
reap(int sig)
{
        int save_errno;

        save_errno = errno;
        while (wait3((int *)NULL, WNOHANG, (struct rusage *)NULL) > 0);
        errno = save_errno;
}