1 /* $OpenBSD: mount_msdos.c,v 1.34 2019/06/28 13:32:45 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/types.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 <limits.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[PATH_MAX]; 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, "sl9u: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 'u': 86 args.uid = a_uid(optarg); 87 set_uid = 1; 88 break; 89 case 'g': 90 args.gid = a_gid(optarg); 91 set_gid = 1; 92 break; 93 case 'm': 94 args.mask = a_mask(optarg); 95 set_mask = 1; 96 break; 97 case 'o': 98 getmntopts(optarg, mopts, &mntflags); 99 break; 100 case '?': 101 default: 102 usage(); 103 break; 104 } 105 } 106 107 if (optind + 2 != argc) 108 usage(); 109 110 dev = argv[optind]; 111 if (realpath(argv[optind + 1], dir) == NULL) 112 err(1, "realpath %s", argv[optind + 1]); 113 114 args.fspec = dev; 115 args.export_info.ex_root = -2; /* unchecked anyway on DOS fs */ 116 if (mntflags & MNT_RDONLY) 117 args.export_info.ex_flags = MNT_EXRDONLY; 118 else 119 args.export_info.ex_flags = 0; 120 if (!set_gid || !set_uid || !set_mask) { 121 if (stat(dir, &sb) == -1) 122 err(1, "stat %s", dir); 123 124 if (!set_uid) 125 args.uid = sb.st_uid; 126 if (!set_gid) 127 args.gid = sb.st_gid; 128 if (!set_mask) 129 args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO); 130 } 131 132 if (mount(MOUNT_MSDOS, dir, mntflags, &args) == -1) { 133 switch (errno) { 134 case EOPNOTSUPP: 135 errcause = "filesystem not supported by kernel"; 136 break; 137 case EMFILE: 138 errcause = "mount table full"; 139 break; 140 case EINVAL: 141 errcause = 142 "not an MSDOS filesystem"; 143 break; 144 default: 145 errcause = strerror(errno); 146 break; 147 } 148 errx(1, "%s on %s: %s", args.fspec, dir, errcause); 149 } 150 151 exit (0); 152 } 153 154 gid_t 155 a_gid(char *s) 156 { 157 struct group *gr; 158 const char *errstr; 159 gid_t gid; 160 161 if ((gr = getgrnam(s)) != NULL) 162 return gr->gr_gid; 163 gid = strtonum(s, 0, GID_MAX, &errstr); 164 if (errstr) 165 errx(1, "group is %s: %s", errstr, s); 166 return (gid); 167 } 168 169 uid_t 170 a_uid(char *s) 171 { 172 struct passwd *pw; 173 const char *errstr; 174 uid_t uid; 175 176 if ((pw = getpwnam(s)) != NULL) 177 return pw->pw_uid; 178 uid = strtonum(s, 0, UID_MAX, &errstr); 179 if (errstr) 180 errx(1, "user is %s: %s", errstr, s); 181 return (uid); 182 } 183 184 mode_t 185 a_mask(char *s) 186 { 187 int done, rv; 188 char *ep; 189 190 done = 0; 191 if (*s >= '0' && *s <= '7') { 192 done = 1; 193 rv = strtol(optarg, &ep, 8); 194 } 195 if (!done || rv < 0 || *ep) 196 errx(1, "invalid file mode: %s", s); 197 return (rv); 198 } 199 200 void 201 usage(void) 202 { 203 204 fprintf(stderr, 205 "usage: mount_msdos [-9ls] [-g gid] [-m mask] [-o options] [-u uid] special node\n"); 206 exit(1); 207 } 208