1 /* $OpenBSD: mount_msdos.c,v 1.28 2013/11/22 04:12:48 deraadt 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/param.h> 35 #include <sys/mount.h> 36 #include <sys/stat.h> 37 #include <ctype.h> 38 #include <err.h> 39 #include <grp.h> 40 #include <pwd.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include <errno.h> 46 47 #include "mntopts.h" 48 49 const struct mntopt mopts[] = { 50 MOPT_STDOPTS, 51 MOPT_UPDATE, 52 MOPT_ASYNC, 53 { NULL } 54 }; 55 56 gid_t a_gid(char *); 57 uid_t a_uid(char *); 58 mode_t a_mask(char *); 59 void usage(void); 60 61 int 62 main(int argc, char **argv) 63 { 64 struct msdosfs_args args; 65 struct stat sb; 66 int c, mntflags, set_gid, set_uid, set_mask; 67 char *dev, dir[MAXPATHLEN]; 68 char *errcause; 69 70 mntflags = set_gid = set_uid = set_mask = 0; 71 (void)memset(&args, '\0', sizeof(args)); 72 73 while ((c = getopt(argc, argv, "sl9xu:g:m:o:")) != -1) { 74 switch (c) { 75 case 's': 76 args.flags |= MSDOSFSMNT_SHORTNAME; 77 break; 78 case 'l': 79 args.flags |= MSDOSFSMNT_LONGNAME; 80 break; 81 case '9': 82 args.flags |= MSDOSFSMNT_NOWIN95; 83 break; 84 case 'x': 85 args.flags |= MSDOSFSMNT_ALLOWDIRX; 86 break; 87 case 'u': 88 args.uid = a_uid(optarg); 89 set_uid = 1; 90 break; 91 case 'g': 92 args.gid = a_gid(optarg); 93 set_gid = 1; 94 break; 95 case 'm': 96 args.mask = a_mask(optarg); 97 set_mask = 1; 98 break; 99 case 'o': 100 getmntopts(optarg, mopts, &mntflags); 101 break; 102 case '?': 103 default: 104 usage(); 105 break; 106 } 107 } 108 109 if (optind + 2 != argc) 110 usage(); 111 112 dev = argv[optind]; 113 if (realpath(argv[optind + 1], dir) == NULL) 114 err(1, "realpath %s", argv[optind + 1]); 115 116 args.fspec = dev; 117 args.export_info.ex_root = -2; /* unchecked anyway on DOS fs */ 118 if (mntflags & MNT_RDONLY) 119 args.export_info.ex_flags = MNT_EXRDONLY; 120 else 121 args.export_info.ex_flags = 0; 122 if (!set_gid || !set_uid || !set_mask) { 123 if (stat(dir, &sb) == -1) 124 err(1, "stat %s", dir); 125 126 if (!set_uid) 127 args.uid = sb.st_uid; 128 if (!set_gid) 129 args.gid = sb.st_gid; 130 if (!set_mask) 131 args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO); 132 } 133 134 if (mount(MOUNT_MSDOS, dir, mntflags, &args) < 0) { 135 switch (errno) { 136 case EOPNOTSUPP: 137 errcause = "filesystem not supported by kernel"; 138 break; 139 case EMFILE: 140 errcause = "mount table full"; 141 break; 142 case EINVAL: 143 errcause = 144 "not an MSDOS filesystem"; 145 break; 146 default: 147 errcause = strerror(errno); 148 break; 149 } 150 errx(1, "%s on %s: %s", args.fspec, dir, errcause); 151 } 152 153 exit (0); 154 } 155 156 gid_t 157 a_gid(char *s) 158 { 159 struct group *gr; 160 char *gname; 161 gid_t gid; 162 163 if ((gr = getgrnam(s)) != NULL) 164 gid = gr->gr_gid; 165 else { 166 for (gname = s; isdigit((unsigned char)*s); ++s) 167 ; 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((unsigned char)*s); ++s) 187 ; 188 if (!*s) 189 uid = atoi(uname); 190 else 191 errx(1, "unknown user id: %s", uname); 192 } 193 return (uid); 194 } 195 196 mode_t 197 a_mask(char *s) 198 { 199 int done, rv; 200 char *ep; 201 202 done = 0; 203 if (*s >= '0' && *s <= '7') { 204 done = 1; 205 rv = strtol(optarg, &ep, 8); 206 } 207 if (!done || rv < 0 || *ep) 208 errx(1, "invalid file mode: %s", s); 209 return (rv); 210 } 211 212 void 213 usage(void) 214 { 215 216 fprintf(stderr, 217 "usage: mount_msdos [-9lsx] [-g gid] [-m mask] [-o options] [-u uid] special node\n"); 218 exit(1); 219 } 220