1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 static const char copyright[] = 37 "@(#) Copyright (c) 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)mount_null.c 8.6 (Berkeley) 4/26/95"; 44 #endif 45 static const char rcsid[] = 46 "$FreeBSD$"; 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/mount.h> 51 #include <sys/uio.h> 52 53 #include <err.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <sysexits.h> 58 #include <unistd.h> 59 60 #include "mntopts.h" 61 62 static void usage(void) __dead2; 63 64 int 65 main(int argc, char *argv[]) 66 { 67 struct iovec *iov; 68 char *p, *val; 69 char mountpoint[MAXPATHLEN]; 70 char target[MAXPATHLEN]; 71 char errmsg[255]; 72 int ch, iovlen; 73 char nullfs[] = "nullfs"; 74 75 iov = NULL; 76 iovlen = 0; 77 errmsg[0] = '\0'; 78 while ((ch = getopt(argc, argv, "o:")) != -1) 79 switch(ch) { 80 case 'o': 81 val = strdup(""); 82 p = strchr(optarg, '='); 83 if (p != NULL) { 84 free(val); 85 *p = '\0'; 86 val = p + 1; 87 } 88 build_iovec(&iov, &iovlen, optarg, val, (size_t)-1); 89 break; 90 case '?': 91 default: 92 usage(); 93 } 94 argc -= optind; 95 argv += optind; 96 97 if (argc != 2) 98 usage(); 99 100 /* resolve target and mountpoint with realpath(3) */ 101 if (checkpath(argv[0], target) != 0) 102 err(EX_USAGE, "%s", target); 103 if (checkpath(argv[1], mountpoint) != 0) 104 err(EX_USAGE, "%s", mountpoint); 105 106 build_iovec(&iov, &iovlen, "fstype", nullfs, (size_t)-1); 107 build_iovec(&iov, &iovlen, "fspath", mountpoint, (size_t)-1); 108 build_iovec(&iov, &iovlen, "target", target, (size_t)-1); 109 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 110 if (nmount(iov, iovlen, 0) < 0) { 111 if (errmsg[0] != 0) 112 err(1, "%s: %s", mountpoint, errmsg); 113 else 114 err(1, "%s", mountpoint); 115 } 116 exit(0); 117 } 118 119 static void 120 usage(void) 121 { 122 (void)fprintf(stderr, 123 "usage: mount_nullfs [-o options] target mount-point\n"); 124 exit(1); 125 } 126