1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. 4 * Copyright (c) 2005, 2006 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc. 5 * Copyright (c) 2006 Daichi Goto <daichi@freebsd.org> 6 * All rights reserved. 7 * 8 * This code is derived from software donated to Berkeley by 9 * Jan-Simon Pendry. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static const char copyright[] = 38 "@(#) Copyright (c) 1992, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)mount_union.c 8.5 (Berkeley) 3/27/94"; 45 #else 46 static const char rcsid[] = 47 "$FreeBSD$"; 48 #endif 49 #endif /* not lint */ 50 51 #include <sys/param.h> 52 #include <sys/mount.h> 53 #include <sys/uio.h> 54 #include <sys/errno.h> 55 56 #include <err.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <sysexits.h> 61 #include <unistd.h> 62 #include <grp.h> 63 #include <pwd.h> 64 65 #include "mntopts.h" 66 67 static int 68 subdir(const char *p, const char *dir) 69 { 70 int l; 71 72 l = strlen(dir); 73 if (l <= 1) 74 return (1); 75 76 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0')) 77 return (1); 78 79 return (0); 80 } 81 82 static void 83 usage(void) 84 { 85 (void)fprintf(stderr, 86 "usage: mount_unionfs [-o options] directory uniondir\n"); 87 exit(EX_USAGE); 88 } 89 90 static void 91 parse_gid(const char *s, char *buf, size_t bufsize) 92 { 93 struct group *gr; 94 char *inval; 95 96 if ((gr = getgrnam(s)) != NULL) 97 snprintf(buf, bufsize, "%d", gr->gr_gid); 98 else { 99 strtol(s, &inval, 10); 100 if (*inval != 0) { 101 errx(EX_NOUSER, "unknown group id: %s", s); 102 usage(); 103 } else { 104 strncpy(buf, s, bufsize); 105 } 106 } 107 } 108 109 static void 110 parse_uid(const char *s, char *buf, size_t bufsize) 111 { 112 struct passwd *pw; 113 char *inval; 114 115 if ((pw = getpwnam(s)) != NULL) 116 snprintf(buf, bufsize, "%d", pw->pw_uid); 117 else { 118 strtol(s, &inval, 10); 119 if (*inval != 0) { 120 errx(EX_NOUSER, "unknown user id: %s", s); 121 usage(); 122 } else { 123 strncpy(buf, s, bufsize); 124 } 125 } 126 } 127 128 int 129 main(int argc, char *argv[]) 130 { 131 struct iovec *iov; 132 int ch, mntflags, iovlen; 133 char source [MAXPATHLEN], target[MAXPATHLEN], errmsg[255]; 134 char uid_str[20], gid_str[20]; 135 char fstype[] = "unionfs"; 136 char *p, *val; 137 138 iov = NULL; 139 iovlen = 0; 140 mntflags = 0; 141 memset(errmsg, 0, sizeof(errmsg)); 142 143 while ((ch = getopt(argc, argv, "bo:")) != -1) { 144 switch (ch) { 145 case 'b': 146 printf("\n -b is deprecated. Use \"-o below\" instead\n"); 147 build_iovec(&iov, &iovlen, "below", NULL, 0); 148 break; 149 case 'o': 150 p = strchr(optarg, '='); 151 val = NULL; 152 if (p != NULL) { 153 *p = '\0'; 154 val = p + 1; 155 if (strcmp(optarg, "gid") == 0) { 156 parse_gid(val, gid_str, sizeof(gid_str)); 157 val = gid_str; 158 } 159 else if (strcmp(optarg, "uid") == 0) { 160 parse_uid(val, uid_str, sizeof(uid_str)); 161 val = uid_str; 162 } 163 } 164 build_iovec(&iov, &iovlen, optarg, val, (size_t)-1); 165 break; 166 case '?': 167 default: 168 usage(); 169 /* NOTREACHED */ 170 } 171 } 172 argc -= optind; 173 argv += optind; 174 175 if (argc != 2) 176 usage(); 177 178 /* resolve both target and source with realpath(3) */ 179 (void)checkpath(argv[0], target); 180 (void)checkpath(argv[1], source); 181 182 if (subdir(target, source) || subdir(source, target)) 183 errx(EX_USAGE, "%s (%s) and %s (%s) are not distinct paths", 184 argv[0], target, argv[1], source); 185 186 build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1); 187 build_iovec(&iov, &iovlen, "fspath", source, (size_t)-1); 188 build_iovec(&iov, &iovlen, "from", target, (size_t)-1); 189 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 190 191 if (nmount(iov, iovlen, mntflags)) 192 err(EX_OSERR, "%s: %s", source, errmsg); 193 exit(0); 194 } 195