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#include <sys/param.h> 33#include <sys/stat.h> 34 35#include <err.h> 36#include <errno.h> 37#include <fcntl.h> 38#include <fts.h> 39#include <grp.h> 40#include <libgen.h> 41#include <pwd.h> 42#include <signal.h> 43#include <stddef.h> 44#include <stdint.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <string.h> 48#include <unistd.h> 49 50static void a_gid(const char *); 51static void a_uid(const char *); 52static void chownerr(const char *); 53static uid_t id(const char *, const char *); 54static void usage(void); 55static void print_info(const FTSENT *, int); 56 57static uid_t uid; 58static gid_t gid; 59static int ischown; 60static const char *gname; 61static volatile sig_atomic_t siginfo; 62 63static void 64siginfo_handler(int sig __unused) 65{ 66 67 siginfo = 1; 68} 69 70int 71main(int argc, char **argv) 72{ 73 FTS *ftsp; 74 FTSENT *p; 75 int Hflag, Lflag, Rflag, fflag, hflag, vflag, xflag; 76 int ch, fts_options, rval; 77 char *cp; 78 79 ischown = (strcmp(basename(argv[0]), "chown") == 0); 80 81 Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0; 82 while ((ch = getopt(argc, argv, "HLPRfhvx")) != -1) 83 switch (ch) { 84 case 'H': 85 Hflag = 1; 86 Lflag = 0; 87 break; 88 case 'L': 89 Lflag = 1; 90 Hflag = 0; 91 break; 92 case 'P': 93 Hflag = Lflag = 0; 94 break; 95 case 'R': 96 Rflag = 1; 97 break; 98 case 'f': 99 fflag = 1; 100 break; 101 case 'h': 102 hflag = 1; 103 break; 104 case 'v': 105 vflag++; 106 break; 107 case 'x': 108 xflag = 1; 109 break; 110 case '?': 111 default: 112 usage(); 113 } 114 argv += optind; 115 argc -= optind; 116 117 if (argc < 2) 118 usage(); 119 120 (void)signal(SIGINFO, siginfo_handler); 121 122 if (Rflag) { 123 if (hflag && (Hflag || Lflag)) 124 errx(1, "the -R%c and -h options may not be " 125 "specified together", Hflag ? 'H' : 'L'); 126 if (Lflag) { 127 fts_options = FTS_LOGICAL; 128 } else { 129 fts_options = FTS_PHYSICAL; 130 131 if (Hflag) { 132 fts_options |= FTS_COMFOLLOW; 133 } 134 } 135 } else if (hflag) { 136 fts_options = FTS_PHYSICAL; 137 } else { 138 fts_options = FTS_LOGICAL; 139 } 140 141 if (xflag) 142 fts_options |= FTS_XDEV; 143 144 uid = (uid_t)-1; 145 gid = (gid_t)-1; 146 if (ischown) { 147 if ((cp = strchr(*argv, ':')) != NULL) { 148 *cp++ = '\0'; 149 a_gid(cp); 150 } 151#ifdef SUPPORT_DOT 152 else if ((cp = strchr(*argv, '.')) != NULL) { 153 warnx("separation of user and group with a period is deprecated"); 154 *cp++ = '\0'; 155 a_gid(cp); 156 } 157#endif 158 a_uid(*argv); 159 } else 160 a_gid(*argv); 161 162 if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL) 163 err(1, NULL); 164 165 for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) { 166 int atflag; 167 168 if ((fts_options & FTS_LOGICAL) || 169 ((fts_options & FTS_COMFOLLOW) && 170 p->fts_level == FTS_ROOTLEVEL)) 171 atflag = 0; 172 else 173 atflag = AT_SYMLINK_NOFOLLOW; 174 175 switch (p->fts_info) { 176 case FTS_D: /* Change it at FTS_DP. */ 177 if (!Rflag) 178 fts_set(ftsp, p, FTS_SKIP); 179 continue; 180 case FTS_DNR: /* Warn, chown. */ 181 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 182 rval = 1; 183 break; 184 case FTS_ERR: /* Warn, continue. */ 185 case FTS_NS: 186 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 187 rval = 1; 188 continue; 189 default: 190 break; 191 } 192 if (siginfo) { 193 print_info(p, 2); 194 siginfo = 0; 195 } 196 if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) && 197 (gid == (gid_t)-1 || gid == p->fts_statp->st_gid)) 198 continue; 199 if (fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflag) 200 == -1 && !fflag) { 201 chownerr(p->fts_path); 202 rval = 1; 203 } else if (vflag) 204 print_info(p, vflag); 205 } 206 if (errno) 207 err(1, "fts_read"); 208 exit(rval); 209} 210 211static void 212a_gid(const char *s) 213{ 214 struct group *gr; 215 216 if (*s == '\0') /* Argument was "uid[:.]". */ 217 return; 218 gname = s; 219 gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group"); 220} 221 222static void 223a_uid(const char *s) 224{ 225 struct passwd *pw; 226 227 if (*s == '\0') /* Argument was "[:.]gid". */ 228 return; 229 uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user"); 230} 231 232static uid_t 233id(const char *name, const char *type) 234{ 235 unsigned long val; 236 char *ep; 237 238 errno = 0; 239 val = strtoul(name, &ep, 10); 240 _Static_assert(UID_MAX >= GID_MAX, "UID MAX less than GID MAX"); 241 if (errno || *ep != '\0' || val > UID_MAX) 242 errx(1, "%s: illegal %s name", name, type); 243 return (val); 244} 245 246static void 247chownerr(const char *file) 248{ 249 static uid_t euid = -1; 250 static int ngroups = -1; 251 static long ngroups_max; 252 gid_t *groups; 253 254 /* Check for chown without being root. */ 255 if (errno != EPERM || (uid != (uid_t)-1 && 256 euid == (uid_t)-1 && (euid = geteuid()) != 0)) { 257 warn("%s", file); 258 return; 259 } 260 261 /* Check group membership; kernel just returns EPERM. */ 262 if (gid != (gid_t)-1 && ngroups == -1 && 263 euid == (uid_t)-1 && (euid = geteuid()) != 0) { 264 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1; 265 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL) 266 err(1, "malloc"); 267 ngroups = getgroups(ngroups_max, groups); 268 while (--ngroups >= 0 && gid != groups[ngroups]); 269 free(groups); 270 if (ngroups < 0) { 271 warnx("you are not a member of group %s", gname); 272 return; 273 } 274 } 275 warn("%s", file); 276} 277 278static void 279usage(void) 280{ 281 282 if (ischown) 283 (void)fprintf(stderr, "%s\n%s\n", 284 "usage: chown [-fhvx] [-R [-H | -L | -P]] owner[:group]" 285 " file ...", 286 " chown [-fhvx] [-R [-H | -L | -P]] :group file ..."); 287 else 288 (void)fprintf(stderr, "%s\n", 289 "usage: chgrp [-fhvx] [-R [-H | -L | -P]] group file ..."); 290 exit(1); 291} 292 293static void 294print_info(const FTSENT *p, int vflag) 295{ 296 297 printf("%s", p->fts_path); 298 if (vflag > 1) { 299 if (ischown) { 300 printf(": %ju:%ju -> %ju:%ju", 301 (uintmax_t)p->fts_statp->st_uid, 302 (uintmax_t)p->fts_statp->st_gid, 303 (uid == (uid_t)-1) ? 304 (uintmax_t)p->fts_statp->st_uid : (uintmax_t)uid, 305 (gid == (gid_t)-1) ? 306 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 307 } else { 308 printf(": %ju -> %ju", (uintmax_t)p->fts_statp->st_gid, 309 (gid == (gid_t)-1) ? 310 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 311 } 312 } 313 printf("\n"); 314} 315