/*      $NetBSD: rump_syspuffs.c,v 1.14 2023/08/03 20:45:50 andvar Exp $        */

/*
 * Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
 *
 * Development of this software was supported by the
 * Research Foundation of Helsinki University of Technology
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/syslimits.h>

#include <assert.h>
#include <err.h>
#include <paths.h>
#include <puffs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <rump/rump.h>

#include "rump_syspuffs.h"

#ifndef MOUNT_NOMAIN
#include <rump/p2k.h>

int
main(int argc, char *argv[])
{
        char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
        struct syspuffs_args args;
        int mntflags, rv;

#if 0
        extern int rumpns_puffsdebug;
        extern int rumpns_putterdebug;

        rumpns_puffsdebug = rumpns_putterdebug = 1;
#endif

        setprogname(argv[0]);

        mount_syspuffs_parseargs(argc, argv, &args, &mntflags,
            canon_dev, canon_dir);

        rv = p2k_run_fs(MOUNT_PUFFS, canon_dev, canon_dir, mntflags, 
                &args.us_kargs, sizeof(args.us_kargs), args.us_pflags);
        if (rv)
                err(1, "mount");

        return 0;
}
#endif /* MOUNT_NOMAIN */

__dead static void
usage(void)
{

        errx(1, "%s: server server_parameters", getprogname());
}

void
mount_syspuffs_parseargs(int argc, char *argv[],
        struct syspuffs_args *args, int *mntflags,
        char *canon_dev, char *canon_dir)
{
        struct puffs_kargs *kargs = &args->us_kargs;
        int *pflags = &args->us_pflags;
        char comfd[16];
        int sv[2];
        size_t len;
        int rv;

        if (argc < 2)
                usage();

        /* Create socketpair for communication with the real file server */
        if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sv) == -1)
                err(1, "socketpair");

        if ((rv = rump_init()) == -1)
                err(1, "rump_init");

        switch (fork()) {
        case 0:
                close(sv[1]);
                snprintf(comfd, sizeof(sv[0]), "%d", sv[0]);
                if (setenv("PUFFS_COMFD", comfd, 1) == -1)
                        err(1, "setenv");

                argv++;
                (void)execvp(argv[0], argv);
                err(1, "execvp");
                /*NOTREACHED*/
        case -1:
                err(1, "fork");
                /*NOTREACHED*/
        default:
                close(sv[0]);
                break;
        }

        /* read args */
        if (read(sv[1], &len, sizeof(len)) != sizeof(len))
                err(1, "mp 1");
        if (len > MAXPATHLEN)
                err(1, "mntpath > MAXPATHLEN");
        if ((size_t)read(sv[1], canon_dir, len) != len)
                err(1, "mp 2");
        if (read(sv[1], &len, sizeof(len)) != sizeof(len))
                err(1, "fn 1");
        if (len > MAXPATHLEN)
                err(1, "devpath > MAXPATHLEN");
        if ((size_t)read(sv[1], canon_dev, len) != len)
                err(1, "fn 2");
        if (read(sv[1], mntflags, sizeof(*mntflags)) != sizeof(*mntflags))
                err(1, "mntflags");
        if (read(sv[1], kargs, sizeof(len)) != sizeof(len)) /* unused now */
                err(1, "unused len");
        if (read(sv[1], kargs, sizeof(*kargs)) != sizeof(*kargs))
                err(1, "puffs_args");
        if (read(sv[1], pflags, sizeof(*pflags)) != sizeof(*pflags))
                err(1, "pflags");

        /* XXX: some adjustments */
        *pflags |= PUFFS_KFLAG_NOCACHE;
        *pflags &= ~PUFFS_FLAG_BUILDPATH;

        rv = rump_pub_syspuffs_glueinit(sv[1], &kargs->pa_fd);
        assert(rv == 0);
}