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  * $FreeBSD$
  39  */
  40
  41 #include <sys/types.h>
  42 #include <sys/sbuf.h>
  43 #include <sys/uio.h>
  44 #include <sys/extattr.h>
  45
  46 #include <libgen.h>
  47 #include <libutil.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <vis.h>
  53 #include <err.h>
  54 #include <errno.h>
  55
  56 static enum { EADUNNO, EAGET, EASET, EARM, EALS } what = EADUNNO;
  57
  58 static void __dead2
  59 usage(void)
  60 {
  61
  62         switch (what) {
  63         case EAGET:
  64                 fprintf(stderr, "usage: getextattr [-fhqsx] attrnamespace");
  65                 fprintf(stderr, " attrname filename ...\n");
  66                 exit(-1);
  67         case EASET:
  68                 fprintf(stderr, "usage: setextattr [-fhnq] attrnamespace");
  69                 fprintf(stderr, " attrname attrvalue filename ...\n");
  70                 fprintf(stderr, "   or  setextattr -i [-fhnq] attrnamespace");
  71                 fprintf(stderr, " attrname filename ...\n");
  72                 exit(-1);
  73         case EARM:
  74                 fprintf(stderr, "usage: rmextattr [-fhq] attrnamespace");
  75                 fprintf(stderr, " attrname filename ...\n");
  76                 exit(-1);
  77         case EALS:
  78                 fprintf(stderr, "usage: lsextattr [-fhq] attrnamespace");
  79                 fprintf(stderr, " filename ...\n");
  80                 exit(-1);
  81         case EADUNNO:
  82         default:
  83                 fprintf(stderr, "usage: (getextattr|lsextattr|rmextattr");
  84                 fprintf(stderr, "|setextattr)\n");
  85                 exit (-1);
  86         }
  87 }
  88
  89 static void
  90 mkbuf(char **buf, int *oldlen, int newlen)
  91 {
  92
  93         if (*oldlen >= newlen)
  94                 return;
  95         if (*buf != NULL)
  96                 free(*buf);
  97         *buf = malloc(newlen);
  98         if (*buf == NULL)
  99                 err(1, "malloc");
 100         *oldlen = newlen;
 101 }
 102
 103 int
 104 main(int argc, char *argv[])
 105 {
 106 #define STDIN_BUF_SZ 4096
 107         char     stdin_data[STDIN_BUF_SZ];
 108         char    *p;
 109
 110         const char *options, *attrname;
 111         size_t  len;
 112         ssize_t ret;
 113         int      ch, error, i, arg_counter, attrnamespace, minargc;
 114
 115         char   *visbuf = NULL;
 116         int     visbuflen = 0;
 117         char   *buf = NULL;
 118         int     buflen = 0;
 119         struct  sbuf *attrvalue = NULL;
 120         int     flag_force = 0;
 121         int     flag_nofollow = 0;
 122         int     flag_null = 0;
 123         int     count_quiet = 0;
 124         int     flag_from_stdin = 0;
 125         int     flag_string = 0;
 126         int     flag_hex = 0;
 127
 128         p = basename(argv[0]);
 129         if (p == NULL)
 130                 p = argv[0];
 131         if (!strcmp(p, "getextattr")) {
 132                 what = EAGET;
 133                 options = "fhqsx";
 134                 minargc = 3;
 135         } else if (!strcmp(p, "setextattr")) {
 136                 what = EASET;
 137                 options = "fhinq";
 138                 minargc = 3;
 139         } else if (!strcmp(p, "rmextattr")) {
 140                 what = EARM;
 141                 options = "fhq";
 142                 minargc = 3;
 143         } else if (!strcmp(p, "lsextattr")) {
 144                 what = EALS;
 145                 options = "fhq";
 146                 minargc = 2;
 147         } else {
 148                 usage();
 149         }
 150
 151         while ((ch = getopt(argc, argv, options)) != -1) {
 152                 switch (ch) {
 153                 case 'f':
 154                         flag_force = 1;
 155                         break;
 156                 case 'h':
 157                         flag_nofollow = 1;
 158                         break;
 159                 case 'i':
 160                         flag_from_stdin = 1;
 161                         break;
 162                 case 'n':
 163                         flag_null = 1;
 164                         break;
 165                 case 'q':
 166                         count_quiet += 1;
 167                         break;
 168                 case 's':
 169                         flag_string = 1;
 170                         break;
 171                 case 'x':
 172                         flag_hex = 1;
 173                         break;
 174                 case '?':
 175                 default:
 176                         usage();
 177                 }
 178         }
 179
 180         argc -= optind;
 181         argv += optind;
 182
 183         if (what == EASET && flag_from_stdin == 0)
 184                 minargc++;
 185
 186         if (argc < minargc)
 187                 usage();
 188
 189         error = extattr_string_to_namespace(argv[0], &attrnamespace);
 190         if (error)
 191                 err(-1, "%s", argv[0]);
 192         argc--; argv++;
 193
 194         if (what != EALS) {
 195                 attrname = argv[0];
 196                 argc--; argv++;
 197         } else
 198                 attrname = NULL;
 199
 200         if (what == EASET) {
 201                 attrvalue = sbuf_new_auto();
 202                 if (flag_from_stdin) {
 203                         while ((error = read(0, stdin_data, STDIN_BUF_SZ)) > 0)
 204                                 sbuf_bcat(attrvalue, stdin_data, error);
 205                 } else {
 206                         sbuf_cpy(attrvalue, argv[0]);
 207                         argc--; argv++;
 208                 }
 209                 sbuf_finish(attrvalue);
 210         }
 211
 212         for (arg_counter = 0; arg_counter < argc; arg_counter++) {
 213                 switch (what) {
 214                 case EARM:
 215                         if (flag_nofollow)
 216                                 error = extattr_delete_link(argv[arg_counter],
 217                                     attrnamespace, attrname);
 218                         else
 219                                 error = extattr_delete_file(argv[arg_counter],
 220                                     attrnamespace, attrname);
 221                         if (error >= 0)
 222                                 continue;
 223                         break;
 224                 case EASET:
 225                         len = sbuf_len(attrvalue) + flag_null;
 226                         if (flag_nofollow)
 227                                 ret = extattr_set_link(argv[arg_counter],
 228                                     attrnamespace, attrname,
 229                                     sbuf_data(attrvalue), len);
 230                         else
 231                                 ret = extattr_set_file(argv[arg_counter],
 232                                     attrnamespace, attrname,
 233                                     sbuf_data(attrvalue), len);
 234                         if (ret >= 0) {
 235                                 if ((size_t)ret != len && !count_quiet) {
 236                                         warnx("Set %zd bytes of %zu for %s",
 237                                             ret, len, attrname);
 238                                 }
 239                                 continue;
 240                         }
 241                         break;
 242                 case EALS:
 243                         if (flag_nofollow)
 244                                 ret = extattr_list_link(argv[arg_counter],
 245                                     attrnamespace, NULL, 0);
 246                         else
 247                                 ret = extattr_list_file(argv[arg_counter],
 248                                     attrnamespace, NULL, 0);
 249                         if (ret < 0)
 250                                 break;
 251                         mkbuf(&buf, &buflen, ret);
 252                         if (flag_nofollow)
 253                                 ret = extattr_list_link(argv[arg_counter],
 254                                     attrnamespace, buf, buflen);
 255                         else
 256                                 ret = extattr_list_file(argv[arg_counter],
 257                                     attrnamespace, buf, buflen);
 258                         if (ret < 0)
 259                                 break;
 260                         if (!count_quiet)
 261                                 printf("%s\t", argv[arg_counter]);
 262                         for (i = 0; i < ret; i += ch + 1) {
 263                             /* The attribute name length is unsigned. */
 264                             ch = (unsigned char)buf[i];
 265                             printf("%s%*.*s", i ? "\t" : "",
 266                                 ch, ch, buf + i + 1);
 267                         }
 268                         if (!count_quiet || ret > 0)
 269                                 printf("\n");
 270                         continue;
 271                 case EAGET:
 272                         if (flag_nofollow)
 273                                 ret = extattr_get_link(argv[arg_counter],
 274                                     attrnamespace, attrname, NULL, 0);
 275                         else
 276                                 ret = extattr_get_file(argv[arg_counter],
 277                                     attrnamespace, attrname, NULL, 0);
 278                         if (ret < 0)
 279                                 break;
 280                         mkbuf(&buf, &buflen, ret);
 281                         if (flag_nofollow)
 282                                 ret = extattr_get_link(argv[arg_counter],
 283                                     attrnamespace, attrname, buf, buflen);
 284                         else
 285                                 ret = extattr_get_file(argv[arg_counter],
 286                                     attrnamespace, attrname, buf, buflen);
 287                         if (ret < 0)
 288                                 break;
 289                         if (!count_quiet)
 290                                 printf("%s\t", argv[arg_counter]);
 291                         if (flag_string) {
 292                                 mkbuf(&visbuf, &visbuflen, ret * 4 + 1);
 293                                 strvisx(visbuf, buf, ret,
 294                                     VIS_SAFE | VIS_WHITE);
 295                                 printf("\"%s\"", visbuf);
 296                         } else if (flag_hex) {
 297                                 for (i = 0; i < ret; i++)
 298                                         printf("%s%02x", i ? " " : "",
 299                                                         (unsigned char)buf[i]);
 300                         } else {
 301                                 fwrite(buf, ret, 1, stdout);
 302                         }
 303                         if (count_quiet < 2)
 304                                 printf("\n");
 305                         continue;
 306                 default:
 307                         break;
 308                 }
 309                 if (!count_quiet)
 310                         warn("%s: failed", argv[arg_counter]);
 311                 if (flag_force)
 312                         continue;
 313                 return(1);
 314         }
 315         return (0);
 316 }