1 /* $OpenBSD: mount_msdos.c,v 1.22 2007/03/20 03:45:54 tedu 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 #ifndef lint 35 static char rcsid[] = "$OpenBSD: mount_msdos.c,v 1.22 2007/03/20 03:45:54 tedu Exp $"; 36 #endif /* not lint */ 37 38 #include <sys/cdefs.h> 39 #include <sys/param.h> 40 #include <sys/mount.h> 41 #include <sys/stat.h> 42 #include <ctype.h> 43 #include <err.h> 44 #include <grp.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include <errno.h> 51 52 #include "mntopts.h" 53 54 const struct mntopt mopts[] = { 55 MOPT_STDOPTS, 56 MOPT_UPDATE, 57 { NULL } 58 }; 59 60 gid_t a_gid(char *); 61 uid_t a_uid(char *); 62 mode_t a_mask(char *); 63 void usage(void); 64 65 int 66 main(int argc, char **argv) 67 { 68 struct msdosfs_args args; 69 struct stat sb; 70 int c, mntflags, set_gid, set_uid, set_mask; 71 char *dev, dir[MAXPATHLEN]; 72 char *errcause; 73 74 mntflags = set_gid = set_uid = set_mask = 0; 75 (void)memset(&args, '\0', sizeof(args)); 76 77 while ((c = getopt(argc, argv, "sl9xu:g:m:o:")) != -1) { 78 switch (c) { 79 case 's': 80 args.flags |= MSDOSFSMNT_SHORTNAME; 81 break; 82 case 'l': 83 args.flags |= MSDOSFSMNT_LONGNAME; 84 break; 85 case '9': 86 args.flags |= MSDOSFSMNT_NOWIN95; 87 break; 88 case 'x': 89 args.flags |= MSDOSFSMNT_ALLOWDIRX; 90 break; 91 case 'u': 92 args.uid = a_uid(optarg); 93 set_uid = 1; 94 break; 95 case 'g': 96 args.gid = a_gid(optarg); 97 set_gid = 1; 98 break; 99 case 'm': 100 args.mask = a_mask(optarg); 101 set_mask = 1; 102 break; 103 case 'o': 104 getmntopts(optarg, mopts, &mntflags); 105 break; 106 case '?': 107 default: 108 usage(); 109 break; 110 } 111 } 112 113 if (optind + 2 != argc) 114 usage(); 115 116 dev = argv[optind]; 117 if (realpath(argv[optind + 1], dir) == NULL) 118 err(1, "realpath %s", argv[optind + 1]); 119 120 args.fspec = dev; 121 args.export_info.ex_root = -2; /* unchecked anyway on DOS fs */ 122 if (mntflags & MNT_RDONLY) 123 args.export_info.ex_flags = MNT_EXRDONLY; 124 else 125 args.export_info.ex_flags = 0; 126 if (!set_gid || !set_uid || !set_mask) { 127 if (stat(dir, &sb) == -1) 128 err(1, "stat %s", dir); 129 130 if (!set_uid) 131 args.uid = sb.st_uid; 132 if (!set_gid) 133 args.gid = sb.st_gid; 134 if (!set_mask) 135 args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO); 136 } 137 138 if (mount(MOUNT_MSDOS, dir, mntflags, &args) < 0) { 139 switch (errno) { 140 case EOPNOTSUPP: 141 errcause = "filesystem not supported by kernel"; 142 break; 143 case EMFILE: 144 errcause = "mount table full"; 145 break; 146 case EINVAL: 147 errcause = 148 "not an MSDOS filesystem"; 149 break; 150 default: 151 errcause = strerror(errno); 152 break; 153 } 154 errx(1, "%s on %s: %s", args.fspec, dir, errcause); 155 } 156 157 exit (0); 158 } 159 160 gid_t 161 a_gid(char *s) 162 { 163 struct group *gr; 164 char *gname; 165 gid_t gid; 166 167 if ((gr = getgrnam(s)) != NULL) 168 gid = gr->gr_gid; 169 else { 170 for (gname = s; isdigit(*s); ++s); 171 if (!*s) 172 gid = atoi(gname); 173 else 174 errx(1, "unknown group id: %s", gname); 175 } 176 return (gid); 177 } 178 179 uid_t 180 a_uid(char *s) 181 { 182 struct passwd *pw; 183 char *uname; 184 uid_t uid; 185 186 if ((pw = getpwnam(s)) != NULL) 187 uid = pw->pw_uid; 188 else { 189 for (uname = s; isdigit(*s); ++s); 190 if (!*s) 191 uid = atoi(uname); 192 else 193 errx(1, "unknown user id: %s", uname); 194 } 195 return (uid); 196 } 197 198 mode_t 199 a_mask(char *s) 200 { 201 int done, rv; 202 char *ep; 203 204 done = 0; 205 if (*s >= '0' && *s <= '7') { 206 done = 1; 207 rv = strtol(optarg, &ep, 8); 208 } 209 if (!done || rv < 0 || *ep) 210 errx(1, "invalid file mode: %s", s); 211 return (rv); 212 } 213 214 void 215 usage(void) 216 { 217 218 fprintf(stderr, 219 "usage: mount_msdos [-9lsx] [-g gid] [-m mask] [-o options] [-u uid] special node\n"); 220 exit(1); 221 } 222