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 #endif 40 41 #include <sys/cdefs.h> 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <fts.h> 49 #include <grp.h> 50 #include <libgen.h> 51 #include <pwd.h> 52 #include <signal.h> 53 #include <stddef.h> 54 #include <stdint.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 static void a_gid(const char *); 61 static void a_uid(const char *); 62 static void chownerr(const char *); 63 static uid_t id(const char *, const char *); 64 static void usage(void); 65 static void print_info(const FTSENT *, int); 66 67 static uid_t uid; 68 static gid_t gid; 69 static int ischown; 70 static const char *gname; 71 static volatile sig_atomic_t siginfo; 72 73 static void 74 siginfo_handler(int sig __unused) 75 { 76 77 siginfo = 1; 78 } 79 80 int 81 main(int argc, char **argv) 82 { 83 FTS *ftsp; 84 FTSENT *p; 85 int Hflag, Lflag, Rflag, fflag, hflag, vflag, xflag; 86 int ch, fts_options, rval; 87 char *cp; 88 89 ischown = (strcmp(basename(argv[0]), "chown") == 0); 90 91 Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0; 92 while ((ch = getopt(argc, argv, "HLPRfhvx")) != -1) 93 switch (ch) { 94 case 'H': 95 Hflag = 1; 96 Lflag = 0; 97 break; 98 case 'L': 99 Lflag = 1; 100 Hflag = 0; 101 break; 102 case 'P': 103 Hflag = Lflag = 0; 104 break; 105 case 'R': 106 Rflag = 1; 107 break; 108 case 'f': 109 fflag = 1; 110 break; 111 case 'h': 112 hflag = 1; 113 break; 114 case 'v': 115 vflag++; 116 break; 117 case 'x': 118 xflag = 1; 119 break; 120 case '?': 121 default: 122 usage(); 123 } 124 argv += optind; 125 argc -= optind; 126 127 if (argc < 2) 128 usage(); 129 130 (void)signal(SIGINFO, siginfo_handler); 131 132 if (Rflag) { 133 if (hflag && (Hflag || Lflag)) 134 errx(1, "the -R%c and -h options may not be " 135 "specified together", Hflag ? 'H' : 'L'); 136 if (Lflag) { 137 fts_options = FTS_LOGICAL; 138 } else { 139 fts_options = FTS_PHYSICAL; 140 141 if (Hflag) { 142 fts_options |= FTS_COMFOLLOW; 143 } 144 } 145 } else if (hflag) { 146 fts_options = FTS_PHYSICAL; 147 } else { 148 fts_options = FTS_LOGICAL; 149 } 150 151 if (xflag) 152 fts_options |= FTS_XDEV; 153 154 uid = (uid_t)-1; 155 gid = (gid_t)-1; 156 if (ischown) { 157 if ((cp = strchr(*argv, ':')) != NULL) { 158 *cp++ = '\0'; 159 a_gid(cp); 160 } 161 #ifdef SUPPORT_DOT 162 else if ((cp = strchr(*argv, '.')) != NULL) { 163 warnx("separation of user and group with a period is deprecated"); 164 *cp++ = '\0'; 165 a_gid(cp); 166 } 167 #endif 168 a_uid(*argv); 169 } else 170 a_gid(*argv); 171 172 if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL) 173 err(1, NULL); 174 175 for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) { 176 int atflag; 177 178 if ((fts_options & FTS_LOGICAL) || 179 ((fts_options & FTS_COMFOLLOW) && 180 p->fts_level == FTS_ROOTLEVEL)) 181 atflag = 0; 182 else 183 atflag = AT_SYMLINK_NOFOLLOW; 184 185 switch (p->fts_info) { 186 case FTS_D: /* Change it at FTS_DP. */ 187 if (!Rflag) 188 fts_set(ftsp, p, FTS_SKIP); 189 continue; 190 case FTS_DNR: /* Warn, chown. */ 191 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 192 rval = 1; 193 break; 194 case FTS_ERR: /* Warn, continue. */ 195 case FTS_NS: 196 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 197 rval = 1; 198 continue; 199 default: 200 break; 201 } 202 if (siginfo) { 203 print_info(p, 2); 204 siginfo = 0; 205 } 206 if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) && 207 (gid == (gid_t)-1 || gid == p->fts_statp->st_gid)) 208 continue; 209 if (fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflag) 210 == -1 && !fflag) { 211 chownerr(p->fts_path); 212 rval = 1; 213 } else if (vflag) 214 print_info(p, vflag); 215 } 216 if (errno) 217 err(1, "fts_read"); 218 exit(rval); 219 } 220 221 static void 222 a_gid(const char *s) 223 { 224 struct group *gr; 225 226 if (*s == '\0') /* Argument was "uid[:.]". */ 227 return; 228 gname = s; 229 gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group"); 230 } 231 232 static void 233 a_uid(const char *s) 234 { 235 struct passwd *pw; 236 237 if (*s == '\0') /* Argument was "[:.]gid". */ 238 return; 239 uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user"); 240 } 241 242 static uid_t 243 id(const char *name, const char *type) 244 { 245 unsigned long val; 246 char *ep; 247 248 errno = 0; 249 val = strtoul(name, &ep, 10); 250 _Static_assert(UID_MAX >= GID_MAX, "UID MAX less than GID MAX"); 251 if (errno || *ep != '\0' || val > UID_MAX) 252 errx(1, "%s: illegal %s name", name, type); 253 return (val); 254 } 255 256 static void 257 chownerr(const char *file) 258 { 259 static uid_t euid = -1; 260 static int ngroups = -1; 261 static long ngroups_max; 262 gid_t *groups; 263 264 /* Check for chown without being root. */ 265 if (errno != EPERM || (uid != (uid_t)-1 && 266 euid == (uid_t)-1 && (euid = geteuid()) != 0)) { 267 warn("%s", file); 268 return; 269 } 270 271 /* Check group membership; kernel just returns EPERM. */ 272 if (gid != (gid_t)-1 && ngroups == -1 && 273 euid == (uid_t)-1 && (euid = geteuid()) != 0) { 274 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1; 275 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL) 276 err(1, "malloc"); 277 ngroups = getgroups(ngroups_max, groups); 278 while (--ngroups >= 0 && gid != groups[ngroups]); 279 free(groups); 280 if (ngroups < 0) { 281 warnx("you are not a member of group %s", gname); 282 return; 283 } 284 } 285 warn("%s", file); 286 } 287 288 static void 289 usage(void) 290 { 291 292 if (ischown) 293 (void)fprintf(stderr, "%s\n%s\n", 294 "usage: chown [-fhvx] [-R [-H | -L | -P]] owner[:group]" 295 " file ...", 296 " chown [-fhvx] [-R [-H | -L | -P]] :group file ..."); 297 else 298 (void)fprintf(stderr, "%s\n", 299 "usage: chgrp [-fhvx] [-R [-H | -L | -P]] group file ..."); 300 exit(1); 301 } 302 303 static void 304 print_info(const FTSENT *p, int vflag) 305 { 306 307 printf("%s", p->fts_path); 308 if (vflag > 1) { 309 if (ischown) { 310 printf(": %ju:%ju -> %ju:%ju", 311 (uintmax_t)p->fts_statp->st_uid, 312 (uintmax_t)p->fts_statp->st_gid, 313 (uid == (uid_t)-1) ? 314 (uintmax_t)p->fts_statp->st_uid : (uintmax_t)uid, 315 (gid == (gid_t)-1) ? 316 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 317 } else { 318 printf(": %ju -> %ju", (uintmax_t)p->fts_statp->st_gid, 319 (gid == (gid_t)-1) ? 320 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 321 } 322 } 323 printf("\n"); 324 } 325