usr.sbin/extattr/rmextattr.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
   5  * Copyright (c) 2002 Poul-Henning Kamp.
   6  * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
   7  * All rights reserved.
   8  *
   9  * This software was developed for the FreeBSD Project by Poul-Henning
  10  * Kamp and Network Associates Laboratories, the Security Research Division
  11  * of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
  12  * ("CBOSS"), as part of the DARPA CHATS research program
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. The names of the authors may not be used to endorse or promote
  23  *    products derived from this software without specific prior written
  24  *    permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/sbuf.h>
  41 #include <sys/uio.h>
  42 #include <sys/extattr.h>
  43
  44 #include <libgen.h>
  45 #include <libutil.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include <vis.h>
  51 #include <err.h>
  52 #include <errno.h>
  53
  54 static enum { EADUNNO, EAGET, EASET, EARM, EALS } what = EADUNNO;
  55
  56 static void __dead2
  57 usage(void)
  58 {
  59
  60         switch (what) {
  61         case EAGET:
  62                 fprintf(stderr, "usage: getextattr [-fhqsx] attrnamespace");
  63                 fprintf(stderr, " attrname filename ...\n");
  64                 exit(-1);
  65         case EASET:
  66                 fprintf(stderr, "usage: setextattr [-fhnq] attrnamespace");
  67                 fprintf(stderr, " attrname attrvalue filename ...\n");
  68                 fprintf(stderr, "   or  setextattr -i [-fhnq] attrnamespace");
  69                 fprintf(stderr, " attrname filename ...\n");
  70                 exit(-1);
  71         case EARM:
  72                 fprintf(stderr, "usage: rmextattr [-fhq] attrnamespace");
  73                 fprintf(stderr, " attrname filename ...\n");
  74                 exit(-1);
  75         case EALS:
  76                 fprintf(stderr, "usage: lsextattr [-fhq] attrnamespace");
  77                 fprintf(stderr, " filename ...\n");
  78                 exit(-1);
  79         case EADUNNO:
  80         default:
  81                 fprintf(stderr, "usage: (getextattr|lsextattr|rmextattr");
  82                 fprintf(stderr, "|setextattr)\n");
  83                 exit (-1);
  84         }
  85 }
  86
  87 static void
  88 mkbuf(char **buf, int *oldlen, int newlen)
  89 {
  90
  91         if (*oldlen >= newlen)
  92                 return;
  93         if (*buf != NULL)
  94                 free(*buf);
  95         *buf = malloc(newlen);
  96         if (*buf == NULL)
  97                 err(1, "malloc");
  98         *oldlen = newlen;
  99 }
 100
 101 int
 102 main(int argc, char *argv[])
 103 {
 104 #define STDIN_BUF_SZ 4096
 105         char     stdin_data[STDIN_BUF_SZ];
 106         char    *p;
 107
 108         const char *options, *attrname;
 109         size_t  len;
 110         ssize_t ret;
 111         int      ch, error, i, arg_counter, attrnamespace, minargc;
 112
 113         char   *visbuf = NULL;
 114         int     visbuflen = 0;
 115         char   *buf = NULL;
 116         int     buflen = 0;
 117         struct  sbuf *attrvalue = NULL;
 118         int     flag_force = 0;
 119         int     flag_nofollow = 0;
 120         int     flag_null = 0;
 121         int     count_quiet = 0;
 122         int     flag_from_stdin = 0;
 123         int     flag_string = 0;
 124         int     flag_hex = 0;
 125
 126         p = basename(argv[0]);
 127         if (p == NULL)
 128                 p = argv[0];
 129         if (!strcmp(p, "getextattr")) {
 130                 what = EAGET;
 131                 options = "fhqsx";
 132                 minargc = 3;
 133         } else if (!strcmp(p, "setextattr")) {
 134                 what = EASET;
 135                 options = "fhinq";
 136                 minargc = 3;
 137         } else if (!strcmp(p, "rmextattr")) {
 138                 what = EARM;
 139                 options = "fhq";
 140                 minargc = 3;
 141         } else if (!strcmp(p, "lsextattr")) {
 142                 what = EALS;
 143                 options = "fhq";
 144                 minargc = 2;
 145         } else {
 146                 usage();
 147         }
 148
 149         while ((ch = getopt(argc, argv, options)) != -1) {
 150                 switch (ch) {
 151                 case 'f':
 152                         flag_force = 1;
 153                         break;
 154                 case 'h':
 155                         flag_nofollow = 1;
 156                         break;
 157                 case 'i':
 158                         flag_from_stdin = 1;
 159                         break;
 160                 case 'n':
 161                         flag_null = 1;
 162                         break;
 163                 case 'q':
 164                         count_quiet += 1;
 165                         break;
 166                 case 's':
 167                         flag_string = 1;
 168                         break;
 169                 case 'x':
 170                         flag_hex = 1;
 171                         break;
 172                 case '?':
 173                 default:
 174                         usage();
 175                 }
 176         }
 177
 178         argc -= optind;
 179         argv += optind;
 180
 181         if (what == EASET && flag_from_stdin == 0)
 182                 minargc++;
 183
 184         if (argc < minargc)
 185                 usage();
 186
 187         error = extattr_string_to_namespace(argv[0], &attrnamespace);
 188         if (error)
 189                 err(-1, "%s", argv[0]);
 190         argc--; argv++;
 191
 192         if (what != EALS) {
 193                 attrname = argv[0];
 194                 argc--; argv++;
 195         } else
 196                 attrname = NULL;
 197
 198         if (what == EASET) {
 199                 attrvalue = sbuf_new_auto();
 200                 if (flag_from_stdin) {
 201                         while ((error = read(0, stdin_data, STDIN_BUF_SZ)) > 0)
 202                                 sbuf_bcat(attrvalue, stdin_data, error);
 203                 } else {
 204                         sbuf_cpy(attrvalue, argv[0]);
 205                         argc--; argv++;
 206                 }
 207                 sbuf_finish(attrvalue);
 208         }
 209
 210         for (arg_counter = 0; arg_counter < argc; arg_counter++) {
 211                 switch (what) {
 212                 case EARM:
 213                         if (flag_nofollow)
 214                                 error = extattr_delete_link(argv[arg_counter],
 215                                     attrnamespace, attrname);
 216                         else
 217                                 error = extattr_delete_file(argv[arg_counter],
 218                                     attrnamespace, attrname);
 219                         if (error >= 0)
 220                                 continue;
 221                         break;
 222                 case EASET:
 223                         len = sbuf_len(attrvalue) + flag_null;
 224                         if (flag_nofollow)
 225                                 ret = extattr_set_link(argv[arg_counter],
 226                                     attrnamespace, attrname,
 227                                     sbuf_data(attrvalue), len);
 228                         else
 229                                 ret = extattr_set_file(argv[arg_counter],
 230                                     attrnamespace, attrname,
 231                                     sbuf_data(attrvalue), len);
 232                         if (ret >= 0) {
 233                                 if ((size_t)ret != len && !count_quiet) {
 234                                         warnx("Set %zd bytes of %zu for %s",
 235                                             ret, len, attrname);
 236                                 }
 237                                 continue;
 238                         }
 239                         break;
 240                 case EALS:
 241                         if (flag_nofollow)
 242                                 ret = extattr_list_link(argv[arg_counter],
 243                                     attrnamespace, NULL, 0);
 244                         else
 245                                 ret = extattr_list_file(argv[arg_counter],
 246                                     attrnamespace, NULL, 0);
 247                         if (ret < 0)
 248                                 break;
 249                         mkbuf(&buf, &buflen, ret);
 250                         if (flag_nofollow)
 251                                 ret = extattr_list_link(argv[arg_counter],
 252                                     attrnamespace, buf, buflen);
 253                         else
 254                                 ret = extattr_list_file(argv[arg_counter],
 255                                     attrnamespace, buf, buflen);
 256                         if (ret < 0)
 257                                 break;
 258                         if (!count_quiet)
 259                                 printf("%s\t", argv[arg_counter]);
 260                         for (i = 0; i < ret; i += ch + 1) {
 261                             /* The attribute name length is unsigned. */
 262                             ch = (unsigned char)buf[i];
 263                             printf("%s%*.*s", i ? "\t" : "",
 264                                 ch, ch, buf + i + 1);
 265                         }
 266                         if (!count_quiet || ret > 0)
 267                                 printf("\n");
 268                         continue;
 269                 case EAGET:
 270                         if (flag_nofollow)
 271                                 ret = extattr_get_link(argv[arg_counter],
 272                                     attrnamespace, attrname, NULL, 0);
 273                         else
 274                                 ret = extattr_get_file(argv[arg_counter],
 275                                     attrnamespace, attrname, NULL, 0);
 276                         if (ret < 0)
 277                                 break;
 278                         mkbuf(&buf, &buflen, ret);
 279                         if (flag_nofollow)
 280                                 ret = extattr_get_link(argv[arg_counter],
 281                                     attrnamespace, attrname, buf, buflen);
 282                         else
 283                                 ret = extattr_get_file(argv[arg_counter],
 284                                     attrnamespace, attrname, buf, buflen);
 285                         if (ret < 0)
 286                                 break;
 287                         if (!count_quiet)
 288                                 printf("%s\t", argv[arg_counter]);
 289                         if (flag_string) {
 290                                 mkbuf(&visbuf, &visbuflen, ret * 4 + 1);
 291                                 strvisx(visbuf, buf, ret,
 292                                     VIS_SAFE | VIS_WHITE);
 293                                 printf("\"%s\"", visbuf);
 294                         } else if (flag_hex) {
 295                                 for (i = 0; i < ret; i++)
 296                                         printf("%s%02x", i ? " " : "",
 297                                                         (unsigned char)buf[i]);
 298                         } else {
 299                                 fwrite(buf, ret, 1, stdout);
 300                         }
 301                         if (count_quiet < 2)
 302                                 printf("\n");
 303                         continue;
 304                 default:
 305                         break;
 306                 }
 307                 if (!count_quiet)
 308                         warn("%s: failed", argv[arg_counter]);
 309                 if (flag_force)
 310                         continue;
 311                 return(1);
 312         }
 313         return (0);
 314 }