chown.c revision 28643
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 "$Id$"; 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; 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, "HLPRfh")) != -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 '?': 113 default: 114 usage(); 115 } 116 argv += optind; 117 argc -= optind; 118 119 if (argc < 2) 120 usage(); 121 122 fts_options = FTS_PHYSICAL; 123 if (Rflag) { 124 if (hflag) 125 errx(1, 126 "the -R and -h options may not be specified together."); 127 if (Hflag) 128 fts_options |= FTS_COMFOLLOW; 129 if (Lflag) { 130 fts_options &= ~FTS_PHYSICAL; 131 fts_options |= FTS_LOGICAL; 132 } 133 } 134 135 uid = gid = -1; 136 if (ischown) { 137#ifdef SUPPORT_DOT 138 if ((cp = strchr(*argv, '.')) != NULL) { 139 *cp++ = '\0'; 140 a_gid(cp); 141 } else 142#endif 143 if ((cp = strchr(*argv, ':')) != NULL) { 144 *cp++ = '\0'; 145 a_gid(cp); 146 } 147 a_uid(*argv); 148 } else 149 a_gid(*argv); 150 151 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL) 152 err(1, NULL); 153 154 for (rval = 0; (p = fts_read(ftsp)) != NULL;) { 155 switch (p->fts_info) { 156 case FTS_D: /* Change it at FTS_DP. */ 157 if (!Rflag) 158 fts_set(ftsp, p, FTS_SKIP); 159 continue; 160 case FTS_DNR: /* Warn, chown, continue. */ 161 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 162 rval = 1; 163 break; 164 case FTS_ERR: /* Warn, continue. */ 165 case FTS_NS: 166 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 167 rval = 1; 168 continue; 169 case FTS_SL: /* Ignore. */ 170 case FTS_SLNONE: 171 /* 172 * The only symlinks that end up here are ones that 173 * don't point to anything and ones that we found 174 * doing a physical walk. 175 */ 176 if (hflag) 177 break; 178 else 179 continue; 180 default: 181 break; 182 } 183 if (hflag) { 184 if (lchown(p->fts_accpath, uid, gid) && !fflag) { 185 chownerr(p->fts_path); 186 rval = 1; 187 } 188 } else { 189 if (chown(p->fts_accpath, uid, gid) && !fflag) { 190 chownerr(p->fts_path); 191 rval = 1; 192 } 193 } 194 } 195 if (errno) 196 err(1, "fts_read"); 197 exit(rval); 198} 199 200void 201a_gid(s) 202 char *s; 203{ 204 struct group *gr; 205 206 if (*s == '\0') /* Argument was "uid[:.]". */ 207 return; 208 gname = s; 209 gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid; 210} 211 212void 213a_uid(s) 214 char *s; 215{ 216 struct passwd *pw; 217 218 if (*s == '\0') /* Argument was "[:.]gid". */ 219 return; 220 uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid; 221} 222 223u_long 224id(name, type) 225 char *name, *type; 226{ 227 u_long val; 228 char *ep; 229 230 /* 231 * XXX 232 * We know that uid_t's and gid_t's are unsigned longs. 233 */ 234 errno = 0; 235 val = strtoul(name, &ep, 10); 236 if (errno) 237 err(1, "%s", name); 238 if (*ep != '\0') 239 errx(1, "%s: illegal %s name", name, type); 240 return (val); 241} 242 243void 244chownerr(file) 245 char *file; 246{ 247 static int euid = -1, ngroups = -1; 248 gid_t groups[NGROUPS]; 249 250 /* Check for chown without being root. */ 251 if (errno != EPERM || 252 (uid != -1 && euid == -1 && (euid = geteuid()) != 0)) 253 err(1, "%s", file); 254 255 /* Check group membership; kernel just returns EPERM. */ 256 if (gid != -1 && ngroups == -1 && 257 euid == -1 && (euid = geteuid()) != 0) { 258 ngroups = getgroups(NGROUPS, groups); 259 while (--ngroups >= 0 && gid != groups[ngroups]); 260 if (ngroups < 0) 261 errx(1, "you are not a member of group %s", gname); 262 } 263 warn("%s", file); 264} 265 266void 267usage() 268{ 269 (void)fprintf(stderr, 270 "usage: %s [-R [-H | -L | -P]] [-f] [-h] %s file ...\n", 271 myname, ischown ? "[owner][:group]" : "group"); 272 exit(1); 273} 274