mount_ptyfs.c revision 1.17
1/* $NetBSD: mount_ptyfs.c,v 1.17 2016/09/05 01:09:57 sevan Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35/* 36 * Copyright (c) 1990, 1992 Jan-Simon Pendry 37 * 38 * This code is derived from software contributed to Berkeley by 39 * Jan-Simon Pendry. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * This product includes software developed by the University of 52 * California, Berkeley and its contributors. 53 * 4. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 */ 69 70#include <sys/cdefs.h> 71#ifndef lint 72__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\ 73 The Regents of the University of California. All rights reserved."); 74#endif /* not lint */ 75 76#ifndef lint 77#if 0 78static char sccsid[] = "@(#)mount_ptyfs.c 8.3 (Berkeley) 5/4/95"; 79#else 80__RCSID("$NetBSD: mount_ptyfs.c,v 1.17 2016/09/05 01:09:57 sevan Exp $"); 81#endif 82#endif /* not lint */ 83 84#include <sys/param.h> 85#include <sys/types.h> 86#include <sys/mount.h> 87#include <sys/stat.h> 88 89#include <fs/ptyfs/ptyfs.h> 90 91#include <err.h> 92#include <unistd.h> 93#include <stdio.h> 94#include <stdlib.h> 95#include <string.h> 96#include <grp.h> 97#include <util.h> 98 99#include <mntopts.h> 100 101#define ALTF_GROUP 0x1 102#define ALTF_MODE 0x2 103#define ALTF_CHROOT 0x4 /* compat */ 104 105static const struct mntopt mopts[] = { 106 MOPT_STDOPTS, 107 MOPT_GETARGS, 108 MOPT_NOATIME, 109 MOPT_RELATIME, 110 { "group", 0, ALTF_GROUP, 1 }, 111 { "mode", 0, ALTF_MODE, 1 }, 112 { "chroot", 0, ALTF_CHROOT, 1 }, /* compat */ 113 MOPT_NULL, 114}; 115 116int mount_ptyfs(int argc, char **argv); 117 118static gid_t getgrp(const char *name); 119__dead static void usage(void); 120 121#ifndef MOUNT_NOMAIN 122int 123main(int argc, char *argv[]) 124{ 125 return mount_ptyfs(argc, argv); 126} 127#endif 128 129static gid_t 130getgrp(const char *name) 131{ 132 char *ep; 133 struct group *grp; 134 long l; 135 136 if (name == NULL) 137 errx(1, "Missing group name"); 138 139 l = strtol(name, &ep, 0); 140 141 if (name == ep || *ep) 142 grp = getgrnam(name); 143 else 144 grp = getgrgid((gid_t)l); 145 146 if (grp == NULL) 147 errx(1, "Cannot find group `%s'", name); 148 149 return grp->gr_gid; 150} 151 152 153int 154mount_ptyfs(int argc, char *argv[]) 155{ 156 int ch, mntflags = 0, altflags = 0; 157 struct ptyfs_args args; 158 mntoptparse_t mp; 159 char canon_dir[MAXPATHLEN]; 160 161 162 setprogname(argv[0]); 163 164 args.version = PTYFS_ARGSVERSION; 165 args.gid = getgrp("tty"); 166 args.mode = S_IRUSR|S_IWUSR|S_IWGRP; 167 args.flags = 0; 168 169 while ((ch = getopt(argc, argv, "cg:m:o:")) != -1) 170 switch (ch) { 171 case 'c': /* compat */ 172 compat: 173 warnx("-c and -o chroot options are obsolete"); 174 break; 175 case 'o': 176 altflags = 0; 177 mp = getmntopts(optarg, mopts, &mntflags, &altflags); 178 if (mp == NULL) 179 err(1, "getmntopts"); 180 if (altflags & ALTF_GROUP) 181 args.gid = getgrp(getmntoptstr(mp, "group")); 182 if (altflags & ALTF_MODE) 183 args.mode = (mode_t)getmntoptnum(mp, "mode"); 184 if (altflags & ALTF_CHROOT) 185 goto compat; 186 freemntopts(mp); 187 break; 188 case 'g': 189 args.gid = getgrp(optarg); 190 break; 191 case 'm': 192 args.mode = (mode_t)strtol(optarg, NULL, 0); 193 break; 194 case '?': 195 default: 196 usage(); 197 } 198 199 argc -= optind; 200 argv += optind; 201 202 if (argc != 2) 203 usage(); 204 205 if (realpath(argv[1], canon_dir) == NULL) /* Check mounton path */ 206 err(1, "realpath %s", argv[1]); 207 if (strncmp(argv[1], canon_dir, MAXPATHLEN)) { 208 warnx("\"%s\" is a relative path.", argv[1]); 209 warnx("using \"%s\" instead.", canon_dir); 210 } 211 212 if (mount(MOUNT_PTYFS, canon_dir, mntflags, &args, sizeof args) == -1) 213 err(1, "ptyfs on %s", canon_dir); 214 if (mntflags & MNT_GETARGS) { 215 printf("version=%d, gid=%lu, mode=0%o\n", args.version, 216 (unsigned long)args.gid, args.mode); 217 } 218 return 0; 219} 220 221static void 222usage(void) 223{ 224 (void)fprintf(stderr, 225 "Usage: %s [-g <group|gid>] [-m <mode>] [-o options] " 226 "ptyfs mountpoint\n", getprogname()); 227 exit(1); 228} 229