1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1988, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/param.h> 48 #include <sys/stat.h> 49 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <fts.h> 54 #include <grp.h> 55 #include <libgen.h> 56 #include <pwd.h> 57 #include <signal.h> 58 #include <stddef.h> 59 #include <stdint.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 static void a_gid(const char *); 66 static void a_uid(const char *); 67 static void chownerr(const char *); 68 static uid_t id(const char *, const char *); 69 static void usage(void); 70 static void print_info(const FTSENT *, int); 71 72 static uid_t uid; 73 static gid_t gid; 74 static int ischown; 75 static const char *gname; 76 static volatile sig_atomic_t siginfo; 77 78 static void 79 siginfo_handler(int sig __unused) 80 { 81 82 siginfo = 1; 83 } 84 85 int 86 main(int argc, char **argv) 87 { 88 FTS *ftsp; 89 FTSENT *p; 90 int Hflag, Lflag, Rflag, fflag, hflag, vflag, xflag; 91 int ch, fts_options, rval; 92 char *cp; 93 94 ischown = (strcmp(basename(argv[0]), "chown") == 0); 95 96 Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0; 97 while ((ch = getopt(argc, argv, "HLPRfhvx")) != -1) 98 switch (ch) { 99 case 'H': 100 Hflag = 1; 101 Lflag = 0; 102 break; 103 case 'L': 104 Lflag = 1; 105 Hflag = 0; 106 break; 107 case 'P': 108 Hflag = Lflag = 0; 109 break; 110 case 'R': 111 Rflag = 1; 112 break; 113 case 'f': 114 fflag = 1; 115 break; 116 case 'h': 117 hflag = 1; 118 break; 119 case 'v': 120 vflag++; 121 break; 122 case 'x': 123 xflag = 1; 124 break; 125 case '?': 126 default: 127 usage(); 128 } 129 argv += optind; 130 argc -= optind; 131 132 if (argc < 2) 133 usage(); 134 135 (void)signal(SIGINFO, siginfo_handler); 136 137 if (Rflag) { 138 if (hflag && (Hflag || Lflag)) 139 errx(1, "the -R%c and -h options may not be " 140 "specified together", Hflag ? 'H' : 'L'); 141 if (Lflag) { 142 fts_options = FTS_LOGICAL; 143 } else { 144 fts_options = FTS_PHYSICAL; 145 146 if (Hflag) { 147 fts_options |= FTS_COMFOLLOW; 148 } 149 } 150 } else if (hflag) { 151 fts_options = FTS_PHYSICAL; 152 } else { 153 fts_options = FTS_LOGICAL; 154 } 155 156 if (xflag) 157 fts_options |= FTS_XDEV; 158 159 uid = (uid_t)-1; 160 gid = (gid_t)-1; 161 if (ischown) { 162 if ((cp = strchr(*argv, ':')) != NULL) { 163 *cp++ = '\0'; 164 a_gid(cp); 165 } 166 #ifdef SUPPORT_DOT 167 else if ((cp = strchr(*argv, '.')) != NULL) { 168 warnx("separation of user and group with a period is deprecated"); 169 *cp++ = '\0'; 170 a_gid(cp); 171 } 172 #endif 173 a_uid(*argv); 174 } else 175 a_gid(*argv); 176 177 if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL) 178 err(1, NULL); 179 180 for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) { 181 int atflag; 182 183 if ((fts_options & FTS_LOGICAL) || 184 ((fts_options & FTS_COMFOLLOW) && 185 p->fts_level == FTS_ROOTLEVEL)) 186 atflag = 0; 187 else 188 atflag = AT_SYMLINK_NOFOLLOW; 189 190 switch (p->fts_info) { 191 case FTS_D: /* Change it at FTS_DP. */ 192 if (!Rflag) 193 fts_set(ftsp, p, FTS_SKIP); 194 continue; 195 case FTS_DNR: /* Warn, chown. */ 196 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 197 rval = 1; 198 break; 199 case FTS_ERR: /* Warn, continue. */ 200 case FTS_NS: 201 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 202 rval = 1; 203 continue; 204 default: 205 break; 206 } 207 if (siginfo) { 208 print_info(p, 2); 209 siginfo = 0; 210 } 211 if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) && 212 (gid == (gid_t)-1 || gid == p->fts_statp->st_gid)) 213 continue; 214 if (fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflag) 215 == -1 && !fflag) { 216 chownerr(p->fts_path); 217 rval = 1; 218 } else if (vflag) 219 print_info(p, vflag); 220 } 221 if (errno) 222 err(1, "fts_read"); 223 exit(rval); 224 } 225 226 static void 227 a_gid(const char *s) 228 { 229 struct group *gr; 230 231 if (*s == '\0') /* Argument was "uid[:.]". */ 232 return; 233 gname = s; 234 gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group"); 235 } 236 237 static void 238 a_uid(const char *s) 239 { 240 struct passwd *pw; 241 242 if (*s == '\0') /* Argument was "[:.]gid". */ 243 return; 244 uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user"); 245 } 246 247 static uid_t 248 id(const char *name, const char *type) 249 { 250 unsigned long val; 251 char *ep; 252 253 errno = 0; 254 val = strtoul(name, &ep, 10); 255 _Static_assert(UID_MAX >= GID_MAX, "UID MAX less than GID MAX"); 256 if (errno || *ep != '\0' || val > UID_MAX) 257 errx(1, "%s: illegal %s name", name, type); 258 return (val); 259 } 260 261 static void 262 chownerr(const char *file) 263 { 264 static uid_t euid = -1; 265 static int ngroups = -1; 266 static long ngroups_max; 267 gid_t *groups; 268 269 /* Check for chown without being root. */ 270 if (errno != EPERM || (uid != (uid_t)-1 && 271 euid == (uid_t)-1 && (euid = geteuid()) != 0)) { 272 warn("%s", file); 273 return; 274 } 275 276 /* Check group membership; kernel just returns EPERM. */ 277 if (gid != (gid_t)-1 && ngroups == -1 && 278 euid == (uid_t)-1 && (euid = geteuid()) != 0) { 279 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1; 280 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL) 281 err(1, "malloc"); 282 ngroups = getgroups(ngroups_max, groups); 283 while (--ngroups >= 0 && gid != groups[ngroups]); 284 free(groups); 285 if (ngroups < 0) { 286 warnx("you are not a member of group %s", gname); 287 return; 288 } 289 } 290 warn("%s", file); 291 } 292 293 static void 294 usage(void) 295 { 296 297 if (ischown) 298 (void)fprintf(stderr, "%s\n%s\n", 299 "usage: chown [-fhvx] [-R [-H | -L | -P]] owner[:group]" 300 " file ...", 301 " chown [-fhvx] [-R [-H | -L | -P]] :group file ..."); 302 else 303 (void)fprintf(stderr, "%s\n", 304 "usage: chgrp [-fhvx] [-R [-H | -L | -P]] group file ..."); 305 exit(1); 306 } 307 308 static void 309 print_info(const FTSENT *p, int vflag) 310 { 311 312 printf("%s", p->fts_path); 313 if (vflag > 1) { 314 if (ischown) { 315 printf(": %ju:%ju -> %ju:%ju", 316 (uintmax_t)p->fts_statp->st_uid, 317 (uintmax_t)p->fts_statp->st_gid, 318 (uid == (uid_t)-1) ? 319 (uintmax_t)p->fts_statp->st_uid : (uintmax_t)uid, 320 (gid == (gid_t)-1) ? 321 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 322 } else { 323 printf(": %ju -> %ju", (uintmax_t)p->fts_statp->st_gid, 324 (gid == (gid_t)-1) ? 325 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 326 } 327 } 328 printf("\n"); 329 } 330