usr.sbin/extattr/rmextattr.c

   1 /*-
   2  * Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
   3  * Copyright (c) 2002 Poul-Henning Kamp.
   4  * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
   5  * All rights reserved.
   6  *
   7  * This software was developed for the FreeBSD Project by Poul-Henning
   8  * Kamp and Network Associates Laboratories, the Security Research Division
   9  * of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
  10  * ("CBOSS"), as part of the DARPA CHATS research program
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The names of the authors may not be used to endorse or promote
  21  *    products derived from this software without specific prior written
  22  *    permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * $FreeBSD$
  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         return;
 100 }
 101
 102 int
 103 main(int argc, char *argv[])
 104 {
 105 #define STDIN_BUF_SZ 1024
 106         char     stdin_data[STDIN_BUF_SZ];
 107         char    *p;
 108
 109         const char *options, *attrname;
 110         size_t  len;
 111         ssize_t ret;
 112         int      ch, error, i, arg_counter, attrnamespace, minargc;
 113
 114         char   *visbuf = NULL;
 115         int     visbuflen = 0;
 116         char   *buf = NULL;
 117         int     buflen = 0;
 118         struct  sbuf *attrvalue = NULL;
 119         int     flag_force = 0;
 120         int     flag_nofollow = 0;
 121         int     flag_null = 0;
 122         int     count_quiet = 0;
 123         int     flag_from_stdin = 0;
 124         int     flag_string = 0;
 125         int     flag_hex = 0;
 126
 127         p = basename(argv[0]);
 128         if (p == NULL)
 129                 p = argv[0];
 130         if (!strcmp(p, "getextattr")) {
 131                 what = EAGET;
 132                 options = "fhqsx";
 133                 minargc = 3;
 134         } else if (!strcmp(p, "setextattr")) {
 135                 what = EASET;
 136                 options = "fhinq";
 137                 minargc = 3;
 138         } else if (!strcmp(p, "rmextattr")) {
 139                 what = EARM;
 140                 options = "fhq";
 141                 minargc = 3;
 142         } else if (!strcmp(p, "lsextattr")) {
 143                 what = EALS;
 144                 options = "fhq";
 145                 minargc = 2;
 146         } else {
 147                 usage();
 148         }
 149
 150         while ((ch = getopt(argc, argv, options)) != -1) {
 151                 switch (ch) {
 152                 case 'f':
 153                         flag_force = 1;
 154                         break;
 155                 case 'h':
 156                         flag_nofollow = 1;
 157                         break;
 158                 case 'i':
 159                         flag_from_stdin = 1;
 160                         break;
 161                 case 'n':
 162                         flag_null = 1;
 163                         break;
 164                 case 'q':
 165                         count_quiet += 1;
 166                         break;
 167                 case 's':
 168                         flag_string = 1;
 169                         break;
 170                 case 'x':
 171                         flag_hex = 1;
 172                         break;
 173                 case '?':
 174                 default:
 175                         usage();
 176                 }
 177         }
 178
 179         argc -= optind;
 180         argv += optind;
 181
 182         if (what == EASET && flag_from_stdin == 0)
 183                 minargc++;
 184
 185         if (argc < minargc)
 186                 usage();
 187
 188         error = extattr_string_to_namespace(argv[0], &attrnamespace);
 189         if (error)
 190                 err(-1, "%s", argv[0]);
 191         argc--; argv++;
 192
 193         if (what != EALS) {
 194                 attrname = argv[0];
 195                 argc--; argv++;
 196         } else
 197                 attrname = NULL;
 198
 199         if (what == EASET) {
 200                 attrvalue = sbuf_new_auto();
 201                 if (flag_from_stdin) {
 202                         while ((error = read(0, stdin_data, STDIN_BUF_SZ)) > 0)
 203                                 sbuf_bcat(attrvalue, stdin_data, error);
 204                 } else {
 205                         sbuf_cpy(attrvalue, argv[0]);
 206                         argc--; argv++;
 207                 }
 208                 sbuf_finish(attrvalue);
 209         }
 210
 211         for (arg_counter = 0; arg_counter < argc; arg_counter++) {
 212                 switch (what) {
 213                 case EARM:
 214                         if (flag_nofollow)
 215                                 error = extattr_delete_link(argv[arg_counter],
 216                                     attrnamespace, attrname);
 217                         else
 218                                 error = extattr_delete_file(argv[arg_counter],
 219                                     attrnamespace, attrname);
 220                         if (error >= 0)
 221                                 continue;
 222                         break;
 223                 case EASET:
 224                         len = sbuf_len(attrvalue) + flag_null;
 225                         if (flag_nofollow)
 226                                 ret = extattr_set_link(argv[arg_counter],
 227                                     attrnamespace, attrname,
 228                                     sbuf_data(attrvalue), len);
 229                         else
 230                                 ret = extattr_set_file(argv[arg_counter],
 231                                     attrnamespace, attrname,
 232                                     sbuf_data(attrvalue), len);
 233                         if (ret >= 0) {
 234                                 if ((size_t)ret != len && !count_quiet) {
 235                                         warnx("Set %zd bytes of %zu for %s",
 236                                             ret, len, attrname);
 237                                 }
 238                                 continue;
 239                         }
 240                         break;
 241                 case EALS:
 242                         if (flag_nofollow)
 243                                 ret = extattr_list_link(argv[arg_counter],
 244                                     attrnamespace, NULL, 0);
 245                         else
 246                                 ret = extattr_list_file(argv[arg_counter],
 247                                     attrnamespace, NULL, 0);
 248                         if (ret < 0)
 249                                 break;
 250                         mkbuf(&buf, &buflen, ret);
 251                         if (flag_nofollow)
 252                                 ret = extattr_list_link(argv[arg_counter],
 253                                     attrnamespace, buf, buflen);
 254                         else
 255                                 ret = extattr_list_file(argv[arg_counter],
 256                                     attrnamespace, buf, buflen);
 257                         if (ret < 0)
 258                                 break;
 259                         if (!count_quiet)
 260                                 printf("%s\t", argv[arg_counter]);
 261                         for (i = 0; i < ret; i += ch + 1) {
 262                             /* The attribute name length is unsigned. */
 263                             ch = (unsigned char)buf[i];
 264                             printf("%s%*.*s", i ? "\t" : "",
 265                                 ch, ch, buf + i + 1);
 266                         }
 267                         if (!count_quiet || ret > 0)
 268                                 printf("\n");
 269                         continue;
 270                 case EAGET:
 271                         if (flag_nofollow)
 272                                 ret = extattr_get_link(argv[arg_counter],
 273                                     attrnamespace, attrname, NULL, 0);
 274                         else
 275                                 ret = extattr_get_file(argv[arg_counter],
 276                                     attrnamespace, attrname, NULL, 0);
 277                         if (ret < 0)
 278                                 break;
 279                         mkbuf(&buf, &buflen, ret);
 280                         if (flag_nofollow)
 281                                 ret = extattr_get_link(argv[arg_counter],
 282                                     attrnamespace, attrname, buf, buflen);
 283                         else
 284                                 ret = extattr_get_file(argv[arg_counter],
 285                                     attrnamespace, attrname, buf, buflen);
 286                         if (ret < 0)
 287                                 break;
 288                         if (!count_quiet)
 289                                 printf("%s\t", argv[arg_counter]);
 290                         if (flag_string) {
 291                                 mkbuf(&visbuf, &visbuflen, ret * 4 + 1);
 292                                 strvisx(visbuf, buf, ret,
 293                                     VIS_SAFE | VIS_WHITE);
 294                                 printf("\"%s\"", visbuf);
 295                         } else if (flag_hex) {
 296                                 for (i = 0; i < ret; i++)
 297                                         printf("%s%02x", i ? " " : "",
 298                                                         (unsigned char)buf[i]);
 299                         } else {
 300                                 fwrite(buf, ret, 1, stdout);
 301                         }
 302                         if (count_quiet < 2)
 303                                 printf("\n");
 304                         continue;
 305                 default:
 306                         break;
 307                 }
 308                 if (!count_quiet)
 309                         warn("%s: failed", argv[arg_counter]);
 310                 if (flag_force)
 311                         continue;
 312                 return(1);
 313         }
 314         return (0);
 315 }