/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1995, 1996
 *      Bill Paul <wpaul@ctr.columbia.edu>.  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 Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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.
 */

#include <sys/cdefs.h>
#include "ypupdate_prot.h"
#include <stdio.h>
#include <stdlib.h> /* getenv, exit */
#include <rpc/pmap_clnt.h> /* for pmap_unset */
#include <rpc/rpc_com.h>
#include <string.h> /* strcmp */
#include <signal.h>
#ifdef __cplusplus
#include <sysent.h> /* getdtablesize, open */
#endif /* __cplusplus */
#include <memory.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <syslog.h>
#include <sys/wait.h>
#include <errno.h>
#include <err.h>
#include <unistd.h>
#include "ypupdated_extern.h"
#include "yp_extern.h"

#ifndef SIG_PF
#define SIG_PF void(*)(int)
#endif

#ifdef DEBUG
#define RPC_SVC_FG
#endif

#define _RPCSVC_CLOSEDOWN 120
int _rpcpmstart;                /* Started by a port monitor ? */
static int _rpcfdtype;
                 /* Whether Stream or Datagram ? */
        /* States a server can be in wrt request */

#define _IDLE 0
#define _SERVED 1
#define _SERVING 2

extern int _rpcsvcstate;         /* Set when a request is serviced */

int debug;

char *progname = "rpc.ypupdated";
char *yp_dir = "/var/yp/";

static void
_msgout(char* msg)
{
#ifdef RPC_SVC_FG
        if (_rpcpmstart)
                syslog(LOG_ERR, "%s", msg);
        else
                warnx("%s", msg);
#else
        syslog(LOG_ERR, "%s", msg);
#endif
}

static void
closedown(int sig)
{
        if (_rpcsvcstate == _IDLE) {
                extern fd_set svc_fdset;
                static int size;
                int i, openfd;

                if (_rpcfdtype == SOCK_DGRAM)
                        exit(0);
                if (size == 0) {
                        size = getdtablesize();
                }
                for (i = 0, openfd = 0; i < size && openfd < 2; i++)
                        if (FD_ISSET(i, &svc_fdset))
                                openfd++;
                if (openfd <= 1)
                        exit(0);
        }
        if (_rpcsvcstate == _SERVED)
                _rpcsvcstate = _IDLE;

        (void) signal(SIGALRM, (SIG_PF) closedown);
        (void) alarm(_RPCSVC_CLOSEDOWN/2);
}

static void
ypupdated_svc_run(void)
{
#ifdef FD_SETSIZE
        fd_set readfds;
#else
        int readfds;
#endif /* def FD_SETSIZE */
        extern int forked;
        int pid;
        int fd_setsize = _rpc_dtablesize();

        /* Establish the identity of the parent ypupdated process. */
        pid = getpid();

        for (;;) {
#ifdef FD_SETSIZE
                readfds = svc_fdset;
#else
                readfds = svc_fds;
#endif /* def FD_SETSIZE */
                switch (select(fd_setsize, &readfds, NULL, NULL,
                               (struct timeval *)0)) {
                case -1:
                        if (errno == EINTR) {
                                continue;
                        }
                        warn("svc_run: - select failed");
                        return;
                case 0:
                        continue;
                default:
                        svc_getreqset(&readfds);
                        if (forked && pid != getpid())
                                exit(0);
                }
        }
}

static void
reaper(int sig)
{
        int status;

        if (sig == SIGHUP) {
#ifdef foo
                load_securenets();
#endif
                return;
        }

        if (sig == SIGCHLD) {
                while (wait3(&status, WNOHANG, NULL) > 0)
                        children--;
        } else {
                (void) pmap_unset(YPU_PROG, YPU_VERS);
                exit(0);
        }
}

void
usage(void)
{
        fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
        exit(0);
}

int
main(int argc, char *argv[])
{
        register SVCXPRT *transp = NULL;
        int sock;
        int proto = 0;
        struct sockaddr_in saddr;
        int asize = sizeof (saddr);
        int ch;

        while ((ch = getopt(argc, argv, "p:h")) != -1) {
                switch (ch) {
                case 'p':
                        yp_dir = optarg;
                        break;
                default:
                        usage();
                        break;
                }
        }
#ifdef foo
        load_securenets();
#endif

        if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
                yp_error("failed to register AUTH_DES flavor");
                exit(1);
        }

        if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
                int ssize = sizeof (int);

                if (saddr.sin_family != AF_INET)
                        exit(1);
                if (getsockopt(0, SOL_SOCKET, SO_TYPE,
                                (char *)&_rpcfdtype, &ssize) == -1)
                        exit(1);
                sock = 0;
                _rpcpmstart = 1;
                proto = 0;
                openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
        } else {
#ifndef RPC_SVC_FG
                if (daemon(0,0)) {
                        err(1, "cannot fork");
                }
                openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
#endif
                sock = RPC_ANYSOCK;
                (void) pmap_unset(YPU_PROG, YPU_VERS);
        }

        if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
                transp = svcudp_create(sock);
                if (transp == NULL) {
                        _msgout("cannot create udp service.");
                        exit(1);
                }
                if (!_rpcpmstart)
                        proto = IPPROTO_UDP;
                if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
                        _msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
                        exit(1);
                }
        }

        if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
                transp = svctcp_create(sock, 0, 0);
                if (transp == NULL) {
                        _msgout("cannot create tcp service.");
                        exit(1);
                }
                if (!_rpcpmstart)
                        proto = IPPROTO_TCP;
                if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
                        _msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
                        exit(1);
                }
        }

        if (transp == (SVCXPRT *)NULL) {
                _msgout("could not create a handle");
                exit(1);
        }
        if (_rpcpmstart) {
                (void) signal(SIGALRM, (SIG_PF) closedown);
                (void) alarm(_RPCSVC_CLOSEDOWN/2);
        }

        (void) signal(SIGPIPE, SIG_IGN);
        (void) signal(SIGCHLD, (SIG_PF) reaper);
        (void) signal(SIGTERM, (SIG_PF) reaper);
        (void) signal(SIGINT, (SIG_PF) reaper);
        (void) signal(SIGHUP, (SIG_PF) reaper);

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