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