1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Copyright (c) 2018, Joyent, Inc. 28 */ 29 30 /* 31 * smbfs umount 32 */ 33 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <stdarg.h> 38 #include <signal.h> 39 #include <unistd.h> 40 #include <kstat.h> 41 #include <rpc/rpc.h> 42 #include <sys/mnttab.h> 43 #include <sys/mount.h> 44 #include <sys/mntent.h> 45 #include <errno.h> 46 #include <locale.h> 47 #include <fslib.h> 48 #include <priv_utils.h> 49 50 #define RET_OK 0 51 #define RET_ERR 32 52 53 static void pr_err(const char *fmt, ...); 54 static void usage(); 55 static int smbfs_unmount(char *, int); 56 static struct extmnttab *mnttab_find(); 57 58 static char *myname; 59 static char typename[64]; 60 61 int 62 main(int argc, char *argv[]) 63 { 64 extern int optind; 65 int c; 66 int umnt_flag = 0; 67 68 (void) setlocale(LC_ALL, ""); 69 70 #if !defined(TEXT_DOMAIN) 71 #define TEXT_DOMAIN "SYS_TEST" 72 #endif 73 (void) textdomain(TEXT_DOMAIN); 74 75 /* 76 * Normal users are allowed to umount smbfs mounts they own. 77 * To allow that, this program is installed setuid root, and 78 * it adds SYS_MOUNT privilege here (if needed), and then 79 * restores the user's normal privileges. 80 */ 81 if (__init_suid_priv(0, PRIV_SYS_MOUNT, (char *)NULL) < 0) { 82 (void) fprintf(stderr, 83 gettext("Insufficient privileges, " 84 "%s must be set-uid root\n"), argv[0]); 85 exit(RET_ERR); 86 } 87 88 myname = strrchr(argv[0], '/'); 89 myname = myname ? myname+1 : argv[0]; 90 (void) sprintf(typename, "smbfs %s", myname); 91 argv[0] = typename; 92 93 /* 94 * Set options 95 */ 96 while ((c = getopt(argc, argv, "f")) != EOF) { 97 switch (c) { 98 case 'f': 99 umnt_flag |= MS_FORCE; /* forced unmount is desired */ 100 break; 101 default: 102 usage(); 103 exit(RET_ERR); 104 } 105 } 106 if (argc - optind != 1) { 107 usage(); 108 exit(RET_ERR); 109 } 110 111 return (smbfs_unmount(argv[optind], umnt_flag)); 112 } 113 114 static void 115 pr_err(const char *fmt, ...) 116 { 117 va_list ap; 118 119 va_start(ap, fmt); 120 (void) fprintf(stderr, "%s: ", typename); 121 (void) vfprintf(stderr, fmt, ap); 122 (void) fflush(stderr); 123 va_end(ap); 124 } 125 126 static void 127 usage() 128 { 129 (void) fprintf(stderr, 130 gettext("Usage: smbfs umount [-o opts] {//server/share | dir}\n")); 131 exit(RET_ERR); 132 } 133 134 static int 135 smbfs_unmount(char *pathname, int umnt_flag) 136 { 137 struct extmnttab *mntp; 138 int rc; 139 140 mntp = mnttab_find(pathname); 141 if (mntp) { 142 pathname = mntp->mnt_mountp; 143 } 144 145 /* Need sys_mount privilege for the umount call. */ 146 (void) __priv_bracket(PRIV_ON); 147 rc = umount2(pathname, umnt_flag); 148 (void) __priv_bracket(PRIV_OFF); 149 150 if (rc < 0) { 151 pr_err(gettext("%s: %s\n"), pathname, strerror(errno)); 152 return (RET_ERR); 153 } 154 155 return (RET_OK); 156 } 157 158 /* 159 * Find the mnttab entry that corresponds to "name". 160 * We're not sure what the name represents: either 161 * a mountpoint name, or a special name (server:/path). 162 * Return the last entry in the file that matches. 163 */ 164 static struct extmnttab * 165 mnttab_find(dirname) 166 char *dirname; 167 { 168 FILE *fp; 169 struct extmnttab mnt; 170 struct extmnttab *res = NULL; 171 172 fp = fopen(MNTTAB, "r"); 173 if (fp == NULL) { 174 pr_err("%s: %s\n", MNTTAB, strerror(errno)); 175 return (NULL); 176 } 177 while (getextmntent(fp, &mnt, sizeof (struct extmnttab)) == 0) { 178 if (strcmp(mnt.mnt_mountp, dirname) == 0 || 179 strcmp(mnt.mnt_special, dirname) == 0) { 180 if (res) 181 fsfreemnttab(res); 182 res = fsdupmnttab(&mnt); 183 } 184 } 185 186 (void) fclose(fp); 187 return (res); 188 } 189