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      1 /*	$NetBSD: rump_syspuffs.c,v 1.14 2023/08/03 20:45:50 andvar Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by the
      7  * Research Foundation of Helsinki University of Technology
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/types.h>
     32 #include <sys/mount.h>
     33 #include <sys/socket.h>
     34 #include <sys/syslimits.h>
     35 
     36 #include <assert.h>
     37 #include <err.h>
     38 #include <paths.h>
     39 #include <puffs.h>
     40 #include <stdio.h>
     41 #include <stdlib.h>
     42 #include <unistd.h>
     43 
     44 #include <rump/rump.h>
     45 
     46 #include "rump_syspuffs.h"
     47 
     48 #ifndef MOUNT_NOMAIN
     49 #include <rump/p2k.h>
     50 
     51 int
     52 main(int argc, char *argv[])
     53 {
     54 	char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
     55 	struct syspuffs_args args;
     56 	int mntflags, rv;
     57 
     58 #if 0
     59 	extern int rumpns_puffsdebug;
     60 	extern int rumpns_putterdebug;
     61 
     62 	rumpns_puffsdebug = rumpns_putterdebug = 1;
     63 #endif
     64 
     65 	setprogname(argv[0]);
     66 
     67 	mount_syspuffs_parseargs(argc, argv, &args, &mntflags,
     68 	    canon_dev, canon_dir);
     69 
     70 	rv = p2k_run_fs(MOUNT_PUFFS, canon_dev, canon_dir, mntflags,
     71 		&args.us_kargs, sizeof(args.us_kargs), args.us_pflags);
     72 	if (rv)
     73 		err(1, "mount");
     74 
     75 	return 0;
     76 }
     77 #endif /* MOUNT_NOMAIN */
     78 
     79 __dead static void
     80 usage(void)
     81 {
     82 
     83 	errx(1, "%s: server server_parameters", getprogname());
     84 }
     85 
     86 void
     87 mount_syspuffs_parseargs(int argc, char *argv[],
     88 	struct syspuffs_args *args, int *mntflags,
     89 	char *canon_dev, char *canon_dir)
     90 {
     91 	struct puffs_kargs *kargs = &args->us_kargs;
     92 	int *pflags = &args->us_pflags;
     93 	char comfd[16];
     94 	int sv[2];
     95 	size_t len;
     96 	int rv;
     97 
     98 	if (argc < 2)
     99 		usage();
    100 
    101 	/* Create socketpair for communication with the real file server */
    102 	if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sv) == -1)
    103 		err(1, "socketpair");
    104 
    105 	if ((rv = rump_init()) == -1)
    106 		err(1, "rump_init");
    107 
    108 	switch (fork()) {
    109 	case 0:
    110 		close(sv[1]);
    111 		snprintf(comfd, sizeof(sv[0]), "%d", sv[0]);
    112 		if (setenv("PUFFS_COMFD", comfd, 1) == -1)
    113 			err(1, "setenv");
    114 
    115 		argv++;
    116 		(void)execvp(argv[0], argv);
    117 		err(1, "execvp");
    118 		/*NOTREACHED*/
    119 	case -1:
    120 		err(1, "fork");
    121 		/*NOTREACHED*/
    122 	default:
    123 		close(sv[0]);
    124 		break;
    125 	}
    126 
    127 	/* read args */
    128 	if (read(sv[1], &len, sizeof(len)) != sizeof(len))
    129 		err(1, "mp 1");
    130 	if (len > MAXPATHLEN)
    131 		err(1, "mntpath > MAXPATHLEN");
    132 	if ((size_t)read(sv[1], canon_dir, len) != len)
    133 		err(1, "mp 2");
    134 	if (read(sv[1], &len, sizeof(len)) != sizeof(len))
    135 		err(1, "fn 1");
    136 	if (len > MAXPATHLEN)
    137 		err(1, "devpath > MAXPATHLEN");
    138 	if ((size_t)read(sv[1], canon_dev, len) != len)
    139 		err(1, "fn 2");
    140 	if (read(sv[1], mntflags, sizeof(*mntflags)) != sizeof(*mntflags))
    141 		err(1, "mntflags");
    142 	if (read(sv[1], kargs, sizeof(len)) != sizeof(len)) /* unused now */
    143 		err(1, "unused len");
    144 	if (read(sv[1], kargs, sizeof(*kargs)) != sizeof(*kargs))
    145 		err(1, "puffs_args");
    146 	if (read(sv[1], pflags, sizeof(*pflags)) != sizeof(*pflags))
    147 		err(1, "pflags");
    148 
    149 	/* XXX: some adjustments */
    150 	*pflags |= PUFFS_KFLAG_NOCACHE;
    151 	*pflags &= ~PUFFS_FLAG_BUILDPATH;
    152 
    153 	rv = rump_pub_syspuffs_glueinit(sv[1], &kargs->pa_fd);
    154 	assert(rv == 0);
    155 }
    156