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 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)chown.c 8.8 (Berkeley) 4/4/94 35 * $FreeBSD: src/usr.sbin/chown/chown.c,v 1.15.2.3 2002/08/07 21:24:33 schweikh Exp $ 36 * $DragonFly: src/usr.sbin/chown/chown.c,v 1.8 2004/12/18 22:48:02 swildner Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/stat.h> 41 42 #include <ctype.h> 43 #include <dirent.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <fts.h> 47 #include <grp.h> 48 #include <pwd.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 static void a_gid(char *); 55 static void a_uid(char *); 56 static void chownerr(const char *); 57 static uid_t id(const char *, const char *); 58 static void usage(void); 59 60 static uid_t uid; 61 static gid_t gid; 62 static int Rflag, ischown, fflag, vflag; 63 static char *gname, *myname; 64 65 int 66 main(int argc, char **argv) 67 { 68 FTS *ftsp; 69 FTSENT *p; 70 int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval; 71 char *cp; 72 73 myname = (cp = strrchr(*argv, '/')) ? cp + 1 : *argv; 74 ischown = myname[2] == 'o'; 75 76 Hflag = Lflag = Pflag = hflag = vflag = 0; 77 while ((ch = getopt(argc, argv, "HLPRfhv")) != -1) 78 switch (ch) { 79 case 'H': 80 Hflag = 1; 81 Lflag = Pflag = 0; 82 break; 83 case 'L': 84 Lflag = 1; 85 Hflag = Pflag = 0; 86 break; 87 case 'P': 88 Pflag = 1; 89 Hflag = Lflag = 0; 90 break; 91 case 'R': 92 Rflag = 1; 93 break; 94 case 'f': 95 fflag = 1; 96 break; 97 case 'h': 98 hflag = 1; 99 break; 100 case 'v': 101 vflag++; 102 break; 103 default: 104 usage(); 105 } 106 argv += optind; 107 argc -= optind; 108 109 if (argc < 2) 110 usage(); 111 112 fts_options = FTS_PHYSICAL; 113 if (Rflag) { 114 if (hflag && (Lflag || Hflag)) 115 errx(1, "the -R and -h options may not be specified together"); 116 if (Hflag) 117 fts_options |= FTS_COMFOLLOW; 118 if (Lflag) { 119 fts_options &= ~FTS_PHYSICAL; 120 fts_options |= FTS_LOGICAL; 121 } 122 } 123 124 uid = gid = -1; 125 if (ischown) { 126 if ((cp = strchr(*argv, ':')) != NULL) { 127 *cp++ = '\0'; 128 a_gid(cp); 129 } 130 #ifdef SUPPORT_DOT 131 else if ((cp = strchr(*argv, '.')) != NULL) { 132 warnx("separation of user and group with a period is deprecated"); 133 *cp++ = '\0'; 134 a_gid(cp); 135 } 136 #endif 137 a_uid(*argv); 138 } else 139 a_gid(*argv); 140 141 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL) 142 err(1, NULL); 143 144 for (rval = 0; (p = fts_read(ftsp)) != NULL;) { 145 switch (p->fts_info) { 146 case FTS_D: /* Change it at FTS_DP. */ 147 if (!Rflag) 148 fts_set(ftsp, p, FTS_SKIP); 149 continue; 150 case FTS_DNR: /* Warn, chown, continue. */ 151 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 152 rval = 1; 153 break; 154 case FTS_ERR: /* Warn, continue. */ 155 case FTS_NS: 156 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 157 rval = 1; 158 continue; 159 case FTS_SL: /* Ignore. */ 160 case FTS_SLNONE: 161 /* 162 * The only symlinks that end up here are ones that 163 * don't point to anything and ones that we found 164 * doing a physical walk. 165 */ 166 if (hflag) 167 break; 168 else 169 continue; 170 default: 171 break; 172 } 173 if ((uid == (uid_t)(-1) || uid == p->fts_statp->st_uid) && 174 (gid == (gid_t)(-1) || gid == p->fts_statp->st_gid)) 175 continue; 176 if (hflag) { 177 if (lchown(p->fts_accpath, uid, gid) && !fflag) { 178 chownerr(p->fts_path); 179 rval = 1; 180 } else { 181 if (vflag) 182 printf("%s\n", p->fts_accpath); 183 } 184 } else { 185 if (chown(p->fts_accpath, uid, gid) && !fflag) { 186 chownerr(p->fts_path); 187 rval = 1; 188 } else { 189 if (vflag) { 190 printf("%s", p->fts_accpath); 191 if (vflag > 1) { 192 if (ischown) { 193 printf(": %d:%d -> %d:%d", 194 (int)p->fts_statp->st_uid, 195 (int)p->fts_statp->st_gid, 196 (uid == (uid_t)-1) ? 197 (int)p->fts_statp->st_uid : 198 (int)uid, 199 (gid == (gid_t)-1) ? 200 (int) p->fts_statp->st_gid : 201 (int)gid); 202 } else { 203 printf(": %d -> %d", 204 (int)p->fts_statp->st_gid, 205 (gid == (gid_t)-1) ? 206 (int)p->fts_statp->st_gid : 207 (int)gid); 208 } 209 } 210 printf("\n"); 211 } 212 } 213 } 214 } 215 if (errno) 216 err(1, "fts_read"); 217 exit(rval); 218 } 219 220 static void 221 a_gid(char *s) 222 { 223 struct group *gr; 224 225 if (*s == '\0') /* Argument was "uid[:.]". */ 226 return; 227 gname = s; 228 gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid; 229 } 230 231 static void 232 a_uid(char *s) 233 { 234 struct passwd *pw; 235 236 if (*s == '\0') /* Argument was "[:.]gid". */ 237 return; 238 uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid; 239 } 240 241 static uid_t 242 id(const char *name, const char *type) 243 { 244 u_long val; 245 char *ep; 246 247 /* 248 * XXX 249 * We know that uid_t's and gid_t's are unsigned longs. 250 */ 251 errno = 0; 252 val = strtoul(name, &ep, 10); 253 if (errno) 254 err(1, "%s", name); 255 if (*ep != '\0') 256 errx(1, "%s: illegal %s name", name, type); 257 return (val); 258 } 259 260 static void 261 chownerr(const char *file) 262 { 263 static uid_t euid = -1; 264 static int ngroups = -1; 265 gid_t groups[NGROUPS]; 266 267 /* Check for chown without being root. */ 268 if (errno != EPERM || 269 (uid != (uid_t)(-1) && euid == (uid_t)(-1) && (euid = geteuid()) != 0)) 270 err(1, "%s", file); 271 272 /* Check group membership; kernel just returns EPERM. */ 273 if (gid != (gid_t)(-1) && ngroups == -1 && 274 euid == (uid_t)(-1) && (euid = geteuid()) != 0) { 275 ngroups = getgroups(NGROUPS, groups); 276 while (--ngroups >= 0 && gid != groups[ngroups]); 277 if (ngroups < 0) 278 errx(1, "you are not a member of group %s", gname); 279 } 280 warn("%s", file); 281 } 282 283 static void 284 usage(void) 285 { 286 fprintf(stderr, "%s\n%s\n%s\n", 287 "usage: chown [-R [-H | -L | -P]] [-f] [-h] [-v] owner[:group] file ...", 288 " chown [-R [-H | -L | -P]] [-f] [-h] [-v] :group file ...", 289 " chgrp [-R [-H | -L | -P]] [-f] [-h] [-v] group file ..."); 290 exit(1); 291 } 292