chown.c revision 57830
1/* 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94"; 43#else 44static const char rcsid[] = 45 "$FreeBSD: head/usr.sbin/chown/chown.c 57830 2000-03-08 16:31:42Z obrien $"; 46#endif 47#endif /* not lint */ 48 49#include <sys/param.h> 50#include <sys/stat.h> 51 52#include <ctype.h> 53#include <dirent.h> 54#include <err.h> 55#include <errno.h> 56#include <fts.h> 57#include <grp.h> 58#include <pwd.h> 59#include <stdio.h> 60#include <stdlib.h> 61#include <string.h> 62#include <unistd.h> 63 64void a_gid __P((char *)); 65void a_uid __P((char *)); 66void chownerr __P((char *)); 67u_long id __P((char *, char *)); 68void usage __P((void)); 69 70uid_t uid; 71gid_t gid; 72int Rflag, ischown, fflag, hflag, vflag; 73char *gname, *myname; 74 75int 76main(argc, argv) 77 int argc; 78 char *argv[]; 79{ 80 FTS *ftsp; 81 FTSENT *p; 82 int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval; 83 char *cp; 84 85 myname = (cp = rindex(*argv, '/')) ? cp + 1 : *argv; 86 ischown = myname[2] == 'o'; 87 88 Hflag = Lflag = Pflag = hflag = 0; 89 while ((ch = getopt(argc, argv, "HLPRfhv")) != -1) 90 switch (ch) { 91 case 'H': 92 Hflag = 1; 93 Lflag = Pflag = 0; 94 break; 95 case 'L': 96 Lflag = 1; 97 Hflag = Pflag = 0; 98 break; 99 case 'P': 100 Pflag = 1; 101 Hflag = Lflag = 0; 102 break; 103 case 'R': 104 Rflag = 1; 105 break; 106 case 'f': 107 fflag = 1; 108 break; 109 case 'h': 110 hflag = 1; 111 break; 112 case 'v': 113 vflag = 1; 114 break; 115 case '?': 116 default: 117 usage(); 118 } 119 argv += optind; 120 argc -= optind; 121 122 if (argc < 2) 123 usage(); 124 125 fts_options = FTS_PHYSICAL; 126 if (Rflag) { 127 if (hflag && (Lflag || Hflag)) 128 errx(1, "the -R and -h options may not be specified together"); 129 if (Hflag) 130 fts_options |= FTS_COMFOLLOW; 131 if (Lflag) { 132 fts_options &= ~FTS_PHYSICAL; 133 fts_options |= FTS_LOGICAL; 134 } 135 } 136 137 uid = gid = -1; 138 if (ischown) { 139 if ((cp = strchr(*argv, ':')) != NULL) { 140 *cp++ = '\0'; 141 a_gid(cp); 142 } 143#ifdef SUPPORT_DOT 144 else if ((cp = strchr(*argv, '.')) != NULL) { 145 *cp++ = '\0'; 146 a_gid(cp); 147 } 148#endif 149 a_uid(*argv); 150 } else 151 a_gid(*argv); 152 153 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL) 154 err(1, NULL); 155 156 for (rval = 0; (p = fts_read(ftsp)) != NULL;) { 157 switch (p->fts_info) { 158 case FTS_D: /* Change it at FTS_DP. */ 159 if (!Rflag) 160 fts_set(ftsp, p, FTS_SKIP); 161 continue; 162 case FTS_DNR: /* Warn, chown, continue. */ 163 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 164 rval = 1; 165 break; 166 case FTS_ERR: /* Warn, continue. */ 167 case FTS_NS: 168 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 169 rval = 1; 170 continue; 171 case FTS_SL: /* Ignore. */ 172 case FTS_SLNONE: 173 /* 174 * The only symlinks that end up here are ones that 175 * don't point to anything and ones that we found 176 * doing a physical walk. 177 */ 178 if (hflag) 179 break; 180 else 181 continue; 182 default: 183 break; 184 } 185 if (hflag) { 186 if (lchown(p->fts_accpath, uid, gid) && !fflag) { 187 chownerr(p->fts_path); 188 rval = 1; 189 } else { 190 if (vflag) 191 (void)printf("%s\n", p->fts_accpath); 192 } 193 } else { 194 if (chown(p->fts_accpath, uid, gid) && !fflag) { 195 chownerr(p->fts_path); 196 rval = 1; 197 } else { 198 if (vflag) 199 (void)printf("%s\n", p->fts_accpath); 200 } 201 } 202 } 203 if (errno) 204 err(1, "fts_read"); 205 exit(rval); 206} 207 208void 209a_gid(s) 210 char *s; 211{ 212 struct group *gr; 213 214 if (*s == '\0') /* Argument was "uid[:.]". */ 215 return; 216 gname = s; 217 gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid; 218} 219 220void 221a_uid(s) 222 char *s; 223{ 224 struct passwd *pw; 225 226 if (*s == '\0') /* Argument was "[:.]gid". */ 227 return; 228 uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid; 229} 230 231u_long 232id(name, type) 233 char *name, *type; 234{ 235 u_long val; 236 char *ep; 237 238 /* 239 * XXX 240 * We know that uid_t's and gid_t's are unsigned longs. 241 */ 242 errno = 0; 243 val = strtoul(name, &ep, 10); 244 if (errno) 245 err(1, "%s", name); 246 if (*ep != '\0') 247 errx(1, "%s: illegal %s name", name, type); 248 return (val); 249} 250 251void 252chownerr(file) 253 char *file; 254{ 255 static int euid = -1, ngroups = -1; 256 gid_t groups[NGROUPS]; 257 258 /* Check for chown without being root. */ 259 if (errno != EPERM || 260 (uid != -1 && euid == -1 && (euid = geteuid()) != 0)) 261 err(1, "%s", file); 262 263 /* Check group membership; kernel just returns EPERM. */ 264 if (gid != -1 && ngroups == -1 && 265 euid == -1 && (euid = geteuid()) != 0) { 266 ngroups = getgroups(NGROUPS, groups); 267 while (--ngroups >= 0 && gid != groups[ngroups]); 268 if (ngroups < 0) 269 errx(1, "you are not a member of group %s", gname); 270 } 271 warn("%s", file); 272} 273 274void 275usage() 276{ 277 (void)fprintf(stderr, "%s\n%s\n%s\n", 278 "usage: chown [-R [-H | -L | -P]] [-f] [-h] [-v] owner[:group] file ...", 279 " chown [-R [-H | -L | -P]] [-f] [-h] [-v] :group file ...", 280 " chgrp [-R [-H | -L | -P]] [-f] [-h] [-v] group file ..."); 281 exit(1); 282} 283