mount_ptyfs.c revision 1.12
1/* $NetBSD: mount_ptyfs.c,v 1.12 2011/08/29 14:35:02 joerg 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 1.12 2011/08/29 14:35:02 joerg 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 104 105static const struct mntopt mopts[] = { 106 MOPT_STDOPTS, 107 MOPT_GETARGS, 108 { "group", 0, ALTF_GROUP, 1 }, 109 { "mode", 0, ALTF_MODE, 1 }, 110 { "chroot", 0, ALTF_CHROOT, 1 }, 111 MOPT_NULL, 112}; 113 114int main(int, char *[]); 115int mount_ptyfs(int argc, char **argv); 116 117static gid_t getgrp(const char *name); 118__dead static void usage(void); 119 120#ifndef MOUNT_NOMAIN 121int 122main(int argc, char *argv[]) 123{ 124 return mount_ptyfs(argc, argv); 125} 126#endif 127 128static gid_t 129getgrp(const char *name) 130{ 131 char *ep; 132 struct group *grp; 133 long l; 134 135 if (name == NULL) 136 errx(1, "Missing group name"); 137 138 l = strtol(name, &ep, 0); 139 140 if (name == ep || *ep) 141 grp = getgrnam(name); 142 else 143 grp = getgrgid((gid_t)l); 144 145 if (grp == NULL) 146 errx(1, "Cannot find group `%s'", name); 147 148 return grp->gr_gid; 149} 150 151 152int 153mount_ptyfs(int argc, char *argv[]) 154{ 155 int ch, mntflags = 0, altflags = 0; 156 struct ptyfs_args args; 157 mntoptparse_t mp; 158 char canon_dir[MAXPATHLEN]; 159 160 161 setprogname(argv[0]); 162 163 args.version = PTYFS_ARGSVERSION; 164 args.gid = getgrp("tty"); 165 args.mode = S_IRUSR|S_IWUSR|S_IWGRP; 166 args.flags = 0; 167 168 while ((ch = getopt(argc, argv, "cg:m:o:")) != -1) 169 switch (ch) { 170 case 'o': 171 altflags = 0; 172 mp = getmntopts(optarg, mopts, &mntflags, &altflags); 173 if (mp == NULL) 174 err(1, "getmntopts"); 175 if (altflags & ALTF_GROUP) 176 args.gid = getgrp(getmntoptstr(mp, "group")); 177 if (altflags & ALTF_MODE) 178 args.mode = (mode_t)getmntoptnum(mp, "mode"); 179 if (altflags & ALTF_CHROOT) 180 args.flags |= PTYFSMNT_CHROOT; 181 freemntopts(mp); 182 break; 183 case 'c': 184 args.flags |= PTYFSMNT_CHROOT; 185 break; 186 case 'g': 187 args.gid = getgrp(optarg); 188 break; 189 case 'm': 190 args.mode = (mode_t)strtol(optarg, NULL, 0); 191 break; 192 case '?': 193 default: 194 usage(); 195 } 196 197 argc -= optind; 198 argv += optind; 199 200 if (argc != 2) 201 usage(); 202 203 if (realpath(argv[1], canon_dir) == NULL) /* Check mounton path */ 204 err(1, "realpath %s", argv[1]); 205 if (strncmp(argv[1], canon_dir, MAXPATHLEN)) { 206 warnx("\"%s\" is a relative path.", argv[1]); 207 warnx("using \"%s\" instead.", canon_dir); 208 } 209 210 if (mount(MOUNT_PTYFS, canon_dir, mntflags, &args, sizeof args) == -1) 211 err(1, "ptyfs on %s", canon_dir); 212 if (mntflags & MNT_GETARGS) { 213 char buf[1024]; 214 (void)snprintb(buf, sizeof(buf), PTYFSMNT_BITS, args.flags); 215 printf("version=%d, flags=%s\n", args.version, buf); 216 printf("version=%d, gid=%lu, mode=0%o flags=%s\n", args.version, 217 (unsigned long)args.gid, args.mode, buf); 218 } 219 return 0; 220} 221 222static void 223usage(void) 224{ 225 (void)fprintf(stderr, 226 "Usage: %s [-c] [-g <group|gid>] [-m <mode>] [-o options] " 227 "ptyfs mountpoint\n", getprogname()); 228 exit(1); 229} 230