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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 30 * @(#)chown.c 8.8 (Berkeley) 4/4/94 31 * $FreeBSD: src/usr.sbin/chown/chown.c,v 1.15.2.3 2002/08/07 21:24:33 schweikh Exp $ 32 * $DragonFly: src/usr.sbin/chown/chown.c,v 1.8 2004/12/18 22:48:02 swildner Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/stat.h> 37 38 #include <ctype.h> 39 #include <dirent.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <fts.h> 43 #include <grp.h> 44 #include <pwd.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 static void a_gid(char *); 51 static void a_uid(char *); 52 static void chownerr(const char *); 53 static uid_t id(const char *, const char *); 54 static void usage(void); 55 56 static uid_t uid; 57 static gid_t gid; 58 static int Rflag, ischown, fflag, vflag; 59 static char *gname, *myname; 60 61 int 62 main(int argc, char **argv) 63 { 64 FTS *ftsp; 65 FTSENT *p; 66 int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval; 67 char *cp; 68 69 myname = (cp = strrchr(*argv, '/')) ? cp + 1 : *argv; 70 ischown = myname[2] == 'o'; 71 72 Hflag = Lflag = Pflag = hflag = vflag = 0; 73 while ((ch = getopt(argc, argv, "HLPRfhv")) != -1) 74 switch (ch) { 75 case 'H': 76 Hflag = 1; 77 Lflag = Pflag = 0; 78 break; 79 case 'L': 80 Lflag = 1; 81 Hflag = Pflag = 0; 82 break; 83 case 'P': 84 Pflag = 1; 85 Hflag = Lflag = 0; 86 break; 87 case 'R': 88 Rflag = 1; 89 break; 90 case 'f': 91 fflag = 1; 92 break; 93 case 'h': 94 hflag = 1; 95 break; 96 case 'v': 97 vflag++; 98 break; 99 default: 100 usage(); 101 } 102 argv += optind; 103 argc -= optind; 104 105 if (argc < 2) 106 usage(); 107 108 fts_options = FTS_PHYSICAL; 109 if (Rflag) { 110 if (hflag && (Lflag || Hflag)) 111 errx(1, "the -R and -h options may not be specified together"); 112 if (Hflag) 113 fts_options |= FTS_COMFOLLOW; 114 if (Lflag) { 115 fts_options &= ~FTS_PHYSICAL; 116 fts_options |= FTS_LOGICAL; 117 } 118 } 119 120 uid = gid = -1; 121 if (ischown) { 122 if ((cp = strchr(*argv, ':')) != NULL) { 123 *cp++ = '\0'; 124 a_gid(cp); 125 } 126 #ifdef SUPPORT_DOT 127 else if ((cp = strchr(*argv, '.')) != NULL) { 128 warnx("separation of user and group with a period is deprecated"); 129 *cp++ = '\0'; 130 a_gid(cp); 131 } 132 #endif 133 a_uid(*argv); 134 } else 135 a_gid(*argv); 136 137 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL) 138 err(1, NULL); 139 140 for (rval = 0; (p = fts_read(ftsp)) != NULL;) { 141 switch (p->fts_info) { 142 case FTS_D: /* Change it at FTS_DP. */ 143 if (!Rflag) 144 fts_set(ftsp, p, FTS_SKIP); 145 continue; 146 case FTS_DNR: /* Warn, chown, continue. */ 147 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 148 rval = 1; 149 break; 150 case FTS_ERR: /* Warn, continue. */ 151 case FTS_NS: 152 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 153 rval = 1; 154 continue; 155 case FTS_SL: /* Ignore. */ 156 case FTS_SLNONE: 157 /* 158 * The only symlinks that end up here are ones that 159 * don't point to anything and ones that we found 160 * doing a physical walk. 161 */ 162 if (hflag) 163 break; 164 else 165 continue; 166 default: 167 break; 168 } 169 if ((uid == (uid_t)(-1) || uid == p->fts_statp->st_uid) && 170 (gid == (gid_t)(-1) || gid == p->fts_statp->st_gid)) 171 continue; 172 if (hflag) { 173 if (lchown(p->fts_accpath, uid, gid) && !fflag) { 174 chownerr(p->fts_path); 175 rval = 1; 176 } else { 177 if (vflag) 178 printf("%s\n", p->fts_accpath); 179 } 180 } else { 181 if (chown(p->fts_accpath, uid, gid) && !fflag) { 182 chownerr(p->fts_path); 183 rval = 1; 184 } else { 185 if (vflag) { 186 printf("%s", p->fts_accpath); 187 if (vflag > 1) { 188 if (ischown) { 189 printf(": %d:%d -> %d:%d", 190 (int)p->fts_statp->st_uid, 191 (int)p->fts_statp->st_gid, 192 (uid == (uid_t)-1) ? 193 (int)p->fts_statp->st_uid : 194 (int)uid, 195 (gid == (gid_t)-1) ? 196 (int) p->fts_statp->st_gid : 197 (int)gid); 198 } else { 199 printf(": %d -> %d", 200 (int)p->fts_statp->st_gid, 201 (gid == (gid_t)-1) ? 202 (int)p->fts_statp->st_gid : 203 (int)gid); 204 } 205 } 206 printf("\n"); 207 } 208 } 209 } 210 } 211 if (errno) 212 err(1, "fts_read"); 213 exit(rval); 214 } 215 216 static void 217 a_gid(char *s) 218 { 219 struct group *gr; 220 221 if (*s == '\0') /* Argument was "uid[:.]". */ 222 return; 223 gname = s; 224 gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid; 225 } 226 227 static void 228 a_uid(char *s) 229 { 230 struct passwd *pw; 231 232 if (*s == '\0') /* Argument was "[:.]gid". */ 233 return; 234 uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid; 235 } 236 237 static uid_t 238 id(const char *name, const char *type) 239 { 240 u_long val; 241 char *ep; 242 243 /* 244 * XXX 245 * We know that uid_t's and gid_t's are unsigned longs. 246 */ 247 errno = 0; 248 val = strtoul(name, &ep, 10); 249 if (errno) 250 err(1, "%s", name); 251 if (*ep != '\0') 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 gid_t groups[NGROUPS]; 262 263 /* Check for chown without being root. */ 264 if (errno != EPERM || 265 (uid != (uid_t)(-1) && euid == (uid_t)(-1) && (euid = geteuid()) != 0)) 266 err(1, "%s", file); 267 268 /* Check group membership; kernel just returns EPERM. */ 269 if (gid != (gid_t)(-1) && ngroups == -1 && 270 euid == (uid_t)(-1) && (euid = geteuid()) != 0) { 271 ngroups = getgroups(NGROUPS, groups); 272 while (--ngroups >= 0 && gid != groups[ngroups]); 273 if (ngroups < 0) 274 errx(1, "you are not a member of group %s", gname); 275 } 276 warn("%s", file); 277 } 278 279 static void 280 usage(void) 281 { 282 fprintf(stderr, "%s\n%s\n%s\n", 283 "usage: chown [-R [-H | -L | -P]] [-f] [-h] [-v] owner[:group] file ...", 284 " chown [-R [-H | -L | -P]] [-f] [-h] [-v] :group file ...", 285 " chgrp [-R [-H | -L | -P]] [-f] [-h] [-v] group file ..."); 286 exit(1); 287 } 288