cmd/ypcmd/ypupdated.c

	ypupdated.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 2000 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   */

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

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

#ifndef lint
static char sccsid[] = "@(#)rpc.ypupdated.c 1.9 87/10/30 Copyr 1986 Sun Micro";
#endif

/*
 * YP update service
 */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/signal.h>
#include <sys/wait.h>
#include <rpc/rpc.h>
#include <rpc/nettype.h>
#include <rpcsvc/ypupd.h>
#include <rpcsvc/ypclnt.h>
#include <netdir.h>
#include <stropts.h>
#ifdef SYSLOG
#include <syslog.h>
#else
#define LOG_ERR 1
#define openlog(a, b, c)
#endif

#ifdef DEBUG
#define RPC_SVC_FG
#define debug(msg)  fprintf(stderr, "%s\n", msg);
#else
#define debug(msg)  /* turn off debugging */
#endif

static char YPDIR[] = "/var/yp";
static char UPDATEFILE[] = "/var/yp/updaters";
#define _RPCSVC_CLOSEDOWN 120

static int addr2netname();
static void closedown();
static void ypupdate_prog();
static void msgout();
static int update();
static int insecure;
static int _rpcpmstart;     /* Started by a port monitor ? */
static int _rpcsvcdirty;    /* Still serving ? */

extern unsigned int alarm();
extern void exit();
extern int close();
extern long fork();
extern int free();
extern struct netconfig *getnetconfigent();
extern int strcmp();
extern int strcpy();
extern int syslog();
extern void *signal();
extern int setsid();
extern int t_getinfo();
extern int user2netname();
extern int _openchild();

main(argc, argv)
    int argc;
    char *argv[];
{
    pid_t   pid;
    char *cmd;
    char mname[FMNAMESZ + 1];

    if (geteuid() != 0) {
        (void) fprintf(stderr, "must be root to run %s\n", argv[0]);
        exit(1);
    }

    cmd = argv[0];
    switch (argc) {
    case 0:
        cmd = "ypupdated";
        break;
    case 1:
        break;
    case 2:
        if (strcmp(argv[1], "-i") == 0) {
            insecure++;
            break;
        }
    default:
        fprintf(stderr, "%s: warning -- options ignored\n", cmd);
        break;
    }

    if (chdir(YPDIR) < 0) {
        fprintf(stderr, "%s: can't chdir to ", cmd);
        perror(YPDIR);
        exit(1);
    }

    if (!ioctl(0, I_LOOK, mname) &&
        (strcmp(mname, "sockmod") == 0 ||
                strcmp(mname, "timod") == 0)) {
        /*
         * Started from port monitor: use 0 as fd
         */
        char *netid;
        struct netconfig *nconf = NULL;
        SVCXPRT *transp;
        int pmclose;
        extern char *getenv();

        _rpcpmstart = 1;
        if ((netid = getenv("NLSPROVIDER")) == NULL) {
            msgout("cannot get transport name");
        }
        if ((nconf = getnetconfigent(netid)) == NULL) {
            msgout("cannot get transport info");
        }
        if (strcmp(mname, "sockmod") == 0) {
            if (ioctl(0, I_POP, 0) || ioctl(0, I_PUSH, "timod")) {
                msgout("could not get the right module");
                exit(1);
            }
        }
        pmclose = (t_getstate(0) != T_DATAXFER);
        if ((transp = svc_tli_create(0, nconf, NULL, 0, 0)) == NULL) {
            msgout("cannot create update server handle");
            exit(1);
        }
        if (!svc_reg(transp, YPU_PROG, YPU_VERS, ypupdate_prog, 0)) {
            msgout("unable to register (YPBINDPROG, YPBINDVERS).");
            exit(1);
        }
        if (nconf)
            freenetconfigent(nconf);

        if (pmclose) {
            (void) signal(SIGALRM, closedown);
            (void) alarm(_RPCSVC_CLOSEDOWN);
        }
        svc_run();
        exit(1);
    }
#ifndef RPC_SVC_FG
    /*
     * Started from shell; background thyself and run
     */
    pid = fork();

    if (pid < 0) {
        perror("cannot fork");
        exit(1);
    }
    if (pid)
        exit(0);
    closefrom(0);
    (void) setsid();
    openlog("ypupdated", LOG_PID, LOG_DAEMON);
#endif
    if (!svc_create(ypupdate_prog, YPU_PROG, YPU_VERS, "netpath")) {
        msgout("unable to create (YPU_PROG, YPU_VERS) for netpath.");
        exit(1);
    }

    svc_run();
    msgout("svc_run returned");
    exit(1);
    /* NOTREACHED */
}

static void
ypupdate_prog(rqstp, transp)
    struct svc_req *rqstp;
    SVCXPRT *transp;
{
    struct ypupdate_args args;
    uint_t rslt;
    uint_t op;
    char *netname;
    char namebuf[MAXNETNAMELEN+1];
    struct authunix_parms *aup;

    switch (rqstp->rq_proc) {
    case NULLPROC:
        svc_sendreply(transp, xdr_void, NULL);
        return;
    case YPU_CHANGE:
        op = YPOP_CHANGE;
        break;
    case YPU_DELETE:
        op = YPOP_DELETE;
        break;
    case YPU_INSERT:
        op = YPOP_INSERT;
        break;
    case YPU_STORE:
        op = YPOP_STORE;
        break;
    default:
        svcerr_noproc(transp);
        return;
    }
#ifdef DEBUG
    fprintf(stderr, "ypupdated: request received\n");
#endif
    switch (rqstp->rq_cred.oa_flavor) {
    case AUTH_DES:
        netname = ((struct authdes_cred *)
            rqstp->rq_clntcred)->adc_fullname.name;
        break;
    case AUTH_UNIX:
        if (insecure) {
            aup = (struct authunix_parms *)rqstp->rq_clntcred;
            if (aup->aup_uid == 0) {
                if (addr2netname(namebuf, transp) != 0) {
                    fprintf(stderr,
                        "addr2netname failing for %d\n",
                        aup->aup_uid);
                    svcerr_systemerr(transp);
                    return;
                }
            } else {
                if (user2netname(namebuf, aup->aup_uid, NULL)
                    != 0) {
                    fprintf(stderr,
                        "user2netname failing for %d\n",
                        aup->aup_uid);
                    svcerr_systemerr(transp);
                    return;
                }
            }
            netname = namebuf;
            break;
        }
    default:
        svcerr_weakauth(transp);
        return;
    }
    memset(&args, 0, sizeof (args));
    if (!svc_getargs(transp, xdr_ypupdate_args, (char *)&args)) {
        svcerr_decode(transp);
        return;
    }
#ifdef DEBUG
    fprintf(stderr, "netname = %s\n, map=%s\n key=%s\n",
        netname, args.mapname, args.key.yp_buf_val);
#endif
    rslt = update(netname, args.mapname, op,
        args.key.yp_buf_len, args.key.yp_buf_val,
        args.datum.yp_buf_len, args.datum.yp_buf_val);
    if (!svc_sendreply(transp, xdr_u_int, (char *)&rslt)) {
        debug("svc_sendreply failed");
    }
    if (!svc_freeargs(transp, xdr_ypupdate_args, (char *)&args)) {
        debug("svc_freeargs failed");
    }
}

/*
 * Determine if requester is allowed to update the given map,
 * and update it if so. Returns the yp status, which is zero
 * if there is no access violation.
 */
static
update(requester, mapname, op, keylen, key, datalen, data)
    char *requester;
    char *mapname;
    uint_t op;
    uint_t keylen;
    char *key;
    uint_t datalen;
    char *data;
{
    char updater[MAXMAPNAMELEN + 40];
    FILE *childargs;
    FILE *childrslt;
    int status;
    int yperrno = 0;
    int pid;

    sprintf(updater, "/usr/ccs/bin/make -s -f %s %s", UPDATEFILE, mapname);
#ifdef DEBUG
    fprintf(stderr, "updater: %s\n", updater);
    fprintf(stderr, "requestor = %s, op = %d, key = %s\n",
        requester, op, key);
    fprintf(stderr, "data = %s\n", data);
#endif
    pid = _openchild(updater, &childargs, &childrslt);
    if (pid < 0) {
        debug("openpipes failed");
        return (YPERR_YPERR);
    }

    /*
     * Write to child
     */
    fprintf(childargs, "%s\n", requester);
    fprintf(childargs, "%u\n", op);
    fprintf(childargs, "%u\n", keylen);
    fwrite(key, keylen, 1, childargs);
    fprintf(childargs, "\n");
    fprintf(childargs, "%u\n", datalen);
    fwrite(data, datalen, 1, childargs);
    fprintf(childargs, "\n");
    fclose(childargs);

    /*
     * Read from child
     */
    fscanf(childrslt, "%d", &yperrno);
    fclose(childrslt);

    wait(&status);
    if (!WIFEXITED(status)) {
        return (YPERR_YPERR);
    }
    return (yperrno);
}

static void
msgout(msg)
    char *msg;
{
    if (_rpcpmstart)
        syslog(LOG_ERR, msg);
    else
        (void) fprintf(stderr, "%s\n", msg);
}

void
closedown()
{
    if (_rpcsvcdirty == 0) {
        int i, openfd;
        struct t_info tinfo;

        if (t_getinfo(0, tinfo) || (tinfo.servtype == T_CLTS))
            exit(0);

        for (i = 0, openfd = 0; i < svc_max_pollfd && openfd < 2; i++)
            if (svc_pollfd[i].fd >= 0)
                openfd++;

        if (openfd <= 1)
            exit(0);
    }
    (void) alarm(_RPCSVC_CLOSEDOWN);
}

static int
addr2netname(namebuf, transp)
    char *namebuf;
    SVCXPRT *transp;
{
    struct nd_hostservlist *hostservs = NULL;
    struct netconfig *nconf;
    struct netbuf *who;

    who = svc_getrpccaller(transp);
    if ((who == NULL) || (who->len == 0))
        return (-1);
    if ((nconf = getnetconfigent(transp->xp_netid))
        == (struct netconfig *)NULL)
        return (-1);
    if (netdir_getbyaddr(nconf, &hostservs, who) != 0) {
        (void) freenetconfigent(nconf);
        return (-1);
    }
    if (hostservs == NULL) {
        msgout("ypupdated: netdir_getbyaddr failed\n");
    } else {
        strcpy(namebuf, hostservs->h_hostservs->h_host);
    }
    (void) freenetconfigent(nconf);
    netdir_free((char *)hostservs, ND_HOSTSERVLIST);
    return (0);
}