1 /* $OpenBSD: mount_msdos.c,v 1.26 2012/07/09 12:58:01 krw Exp $ */ 2 /* $NetBSD: mount_msdos.c,v 1.16 1996/10/24 00:12:50 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1994 Christopher G. Demetriou 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christopher G. Demetriou. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #include <sys/param.h> 36 #include <sys/mount.h> 37 #include <sys/stat.h> 38 #include <ctype.h> 39 #include <err.h> 40 #include <grp.h> 41 #include <pwd.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <errno.h> 47 48 #include "mntopts.h" 49 50 const struct mntopt mopts[] = { 51 MOPT_STDOPTS, 52 MOPT_UPDATE, 53 MOPT_ASYNC, 54 { NULL } 55 }; 56 57 gid_t a_gid(char *); 58 uid_t a_uid(char *); 59 mode_t a_mask(char *); 60 void usage(void); 61 62 int 63 main(int argc, char **argv) 64 { 65 struct msdosfs_args args; 66 struct stat sb; 67 int c, mntflags, set_gid, set_uid, set_mask; 68 char *dev, dir[MAXPATHLEN]; 69 char *errcause; 70 71 mntflags = set_gid = set_uid = set_mask = 0; 72 (void)memset(&args, '\0', sizeof(args)); 73 74 while ((c = getopt(argc, argv, "sl9xu:g:m:o:")) != -1) { 75 switch (c) { 76 case 's': 77 args.flags |= MSDOSFSMNT_SHORTNAME; 78 break; 79 case 'l': 80 args.flags |= MSDOSFSMNT_LONGNAME; 81 break; 82 case '9': 83 args.flags |= MSDOSFSMNT_NOWIN95; 84 break; 85 case 'x': 86 args.flags |= MSDOSFSMNT_ALLOWDIRX; 87 break; 88 case 'u': 89 args.uid = a_uid(optarg); 90 set_uid = 1; 91 break; 92 case 'g': 93 args.gid = a_gid(optarg); 94 set_gid = 1; 95 break; 96 case 'm': 97 args.mask = a_mask(optarg); 98 set_mask = 1; 99 break; 100 case 'o': 101 getmntopts(optarg, mopts, &mntflags); 102 break; 103 case '?': 104 default: 105 usage(); 106 break; 107 } 108 } 109 110 if (optind + 2 != argc) 111 usage(); 112 113 dev = argv[optind]; 114 if (realpath(argv[optind + 1], dir) == NULL) 115 err(1, "realpath %s", argv[optind + 1]); 116 117 args.fspec = dev; 118 args.export_info.ex_root = -2; /* unchecked anyway on DOS fs */ 119 if (mntflags & MNT_RDONLY) 120 args.export_info.ex_flags = MNT_EXRDONLY; 121 else 122 args.export_info.ex_flags = 0; 123 if (!set_gid || !set_uid || !set_mask) { 124 if (stat(dir, &sb) == -1) 125 err(1, "stat %s", dir); 126 127 if (!set_uid) 128 args.uid = sb.st_uid; 129 if (!set_gid) 130 args.gid = sb.st_gid; 131 if (!set_mask) 132 args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO); 133 } 134 135 if (mount(MOUNT_MSDOS, dir, mntflags, &args) < 0) { 136 switch (errno) { 137 case EOPNOTSUPP: 138 errcause = "filesystem not supported by kernel"; 139 break; 140 case EMFILE: 141 errcause = "mount table full"; 142 break; 143 case EINVAL: 144 errcause = 145 "not an MSDOS filesystem"; 146 break; 147 default: 148 errcause = strerror(errno); 149 break; 150 } 151 errx(1, "%s on %s: %s", args.fspec, dir, errcause); 152 } 153 154 exit (0); 155 } 156 157 gid_t 158 a_gid(char *s) 159 { 160 struct group *gr; 161 char *gname; 162 gid_t gid; 163 164 if ((gr = getgrnam(s)) != NULL) 165 gid = gr->gr_gid; 166 else { 167 for (gname = s; isdigit(*s); ++s); 168 if (!*s) 169 gid = atoi(gname); 170 else 171 errx(1, "unknown group id: %s", gname); 172 } 173 return (gid); 174 } 175 176 uid_t 177 a_uid(char *s) 178 { 179 struct passwd *pw; 180 char *uname; 181 uid_t uid; 182 183 if ((pw = getpwnam(s)) != NULL) 184 uid = pw->pw_uid; 185 else { 186 for (uname = s; isdigit(*s); ++s); 187 if (!*s) 188 uid = atoi(uname); 189 else 190 errx(1, "unknown user id: %s", uname); 191 } 192 return (uid); 193 } 194 195 mode_t 196 a_mask(char *s) 197 { 198 int done, rv; 199 char *ep; 200 201 done = 0; 202 if (*s >= '0' && *s <= '7') { 203 done = 1; 204 rv = strtol(optarg, &ep, 8); 205 } 206 if (!done || rv < 0 || *ep) 207 errx(1, "invalid file mode: %s", s); 208 return (rv); 209 } 210 211 void 212 usage(void) 213 { 214 215 fprintf(stderr, 216 "usage: mount_msdos [-9lsx] [-g gid] [-m mask] [-o options] [-u uid] special node\n"); 217 exit(1); 218 } 219