chown.c revision 24446
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 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 41static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94"; 42#endif /* not lint */ 43 44#include <sys/param.h> 45#include <sys/stat.h> 46 47#include <ctype.h> 48#include <dirent.h> 49#include <err.h> 50#include <errno.h> 51#include <fts.h> 52#include <grp.h> 53#include <pwd.h> 54#include <stdio.h> 55#include <stdlib.h> 56#include <string.h> 57#include <unistd.h> 58 59void a_gid __P((char *)); 60void a_uid __P((char *)); 61void chownerr __P((char *)); 62u_long id __P((char *, char *)); 63void usage __P((void)); 64 65uid_t uid; 66gid_t gid; 67int Rflag, ischown, fflag, hflag; 68char *gname, *myname; 69 70int 71main(argc, argv) 72 int argc; 73 char *argv[]; 74{ 75 FTS *ftsp; 76 FTSENT *p; 77 int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval; 78 char *cp; 79 80 myname = (cp = rindex(*argv, '/')) ? cp + 1 : *argv; 81 ischown = myname[2] == 'o'; 82 83 Hflag = Lflag = Pflag = hflag = 0; 84 while ((ch = getopt(argc, argv, "HLPRfh")) != -1) 85 switch (ch) { 86 case 'H': 87 Hflag = 1; 88 Lflag = Pflag = 0; 89 break; 90 case 'L': 91 Lflag = 1; 92 Hflag = Pflag = 0; 93 break; 94 case 'P': 95 Pflag = 1; 96 Hflag = Lflag = 0; 97 break; 98 case 'R': 99 Rflag = 1; 100 break; 101 case 'f': 102 fflag = 1; 103 break; 104 case 'h': 105 hflag = 1; 106 break; 107 case '?': 108 default: 109 usage(); 110 } 111 argv += optind; 112 argc -= optind; 113 114 if (argc < 2) 115 usage(); 116 117 fts_options = FTS_PHYSICAL; 118 if (Rflag) { 119 if (hflag) 120 errx(1, 121 "the -R and -h options may not be specified together."); 122 if (Hflag) 123 fts_options |= FTS_COMFOLLOW; 124 if (Lflag) { 125 fts_options &= ~FTS_PHYSICAL; 126 fts_options |= FTS_LOGICAL; 127 } 128 } 129 130 uid = gid = -1; 131 if (ischown) { 132#ifdef SUPPORT_DOT 133 if ((cp = strchr(*argv, '.')) != NULL) { 134 *cp++ = '\0'; 135 a_gid(cp); 136 } else 137#endif 138 if ((cp = strchr(*argv, ':')) != NULL) { 139 *cp++ = '\0'; 140 a_gid(cp); 141 } 142 a_uid(*argv); 143 } else 144 a_gid(*argv); 145 146 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL) 147 err(1, NULL); 148 149 for (rval = 0; (p = fts_read(ftsp)) != NULL;) { 150 switch (p->fts_info) { 151 case FTS_D: /* Change it at FTS_DP. */ 152 if (!Rflag) 153 fts_set(ftsp, p, FTS_SKIP); 154 continue; 155 case FTS_DNR: /* Warn, chown, continue. */ 156 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 157 rval = 1; 158 break; 159 case FTS_ERR: /* Warn, continue. */ 160 case FTS_NS: 161 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 162 rval = 1; 163 continue; 164 case FTS_SL: /* Ignore. */ 165 case FTS_SLNONE: 166 /* 167 * The only symlinks that end up here are ones that 168 * don't point to anything and ones that we found 169 * doing a physical walk. 170 */ 171 if (hflag) 172 break; 173 else 174 continue; 175 default: 176 break; 177 } 178 if (hflag) { 179 if (lchown(p->fts_accpath, uid, gid) && !fflag) { 180 chownerr(p->fts_path); 181 rval = 1; 182 } 183 } else { 184 if (chown(p->fts_accpath, uid, gid) && !fflag) { 185 chownerr(p->fts_path); 186 rval = 1; 187 } 188 } 189 } 190 if (errno) 191 err(1, "fts_read"); 192 exit(rval); 193} 194 195void 196a_gid(s) 197 char *s; 198{ 199 struct group *gr; 200 201 if (*s == '\0') /* Argument was "uid[:.]". */ 202 return; 203 gname = s; 204 gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid; 205} 206 207void 208a_uid(s) 209 char *s; 210{ 211 struct passwd *pw; 212 213 if (*s == '\0') /* Argument was "[:.]gid". */ 214 return; 215 uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid; 216} 217 218u_long 219id(name, type) 220 char *name, *type; 221{ 222 u_long val; 223 char *ep; 224 225 /* 226 * XXX 227 * We know that uid_t's and gid_t's are unsigned longs. 228 */ 229 errno = 0; 230 val = strtoul(name, &ep, 10); 231 if (errno) 232 err(1, "%s", name); 233 if (*ep != '\0') 234 errx(1, "%s: illegal %s name", name, type); 235 return (val); 236} 237 238void 239chownerr(file) 240 char *file; 241{ 242 static int euid = -1, ngroups = -1; 243 gid_t groups[NGROUPS]; 244 245 /* Check for chown without being root. */ 246 if (errno != EPERM || 247 uid != -1 && euid == -1 && (euid = geteuid()) != 0) { 248 if (fflag) 249 exit(0); 250 err(1, "%s", file); 251 } 252 253 /* Check group membership; kernel just returns EPERM. */ 254 if (gid != -1 && ngroups == -1) { 255 ngroups = getgroups(NGROUPS, groups); 256 while (--ngroups >= 0 && gid != groups[ngroups]); 257 if (ngroups < 0) { 258 if (fflag) 259 exit(0); 260 errx(1, "you are not a member of group %s", gname); 261 } 262 } 263 264 if (!fflag) 265 warn("%s", file); 266} 267 268void 269usage() 270{ 271 (void)fprintf(stderr, 272 "usage: %s [-R [-H | -L | -P]] [-f] [-h] %s file ...\n", 273 myname, ischown ? "[owner][:group]" : "group"); 274 exit(1); 275} 276