granicus.if.org Git - strace/blob - loop.c

   1 /*
   2  * Copyright (c) 2012 The Chromium OS Authors.
   3  * Written by Mike Frysinger <vapier@gentoo.org>.
   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. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "defs.h"
  29
  30 #include <sys/ioctl.h>
  31
  32 #include <linux/loop.h>
  33
  34 static const struct xlat loop_flags_options[] = {
  35         { LO_FLAGS_READ_ONLY,   "LO_FLAGS_READ_ONLY"    },
  36 #if HAVE_DECL_LO_FLAGS_AUTOCLEAR
  37         { LO_FLAGS_AUTOCLEAR,   "LO_FLAGS_AUTOCLEAR"    },
  38 #endif
  39 #if HAVE_DECL_LO_FLAGS_PARTSCAN
  40         { LO_FLAGS_PARTSCAN,    "LO_FLAGS_PARTSCAN"     },
  41 #endif
  42         { 0,                    NULL                    },
  43 };
  44
  45 static const struct xlat loop_crypt_type_options[] = {
  46         { LO_CRYPT_NONE,        "LO_CRYPT_NONE"         },
  47         { LO_CRYPT_XOR,         "LO_CRYPT_XOR"          },
  48         { LO_CRYPT_DES,         "LO_CRYPT_DES"          },
  49         { LO_CRYPT_FISH2,       "LO_CRYPT_FISH2"        },
  50         { LO_CRYPT_BLOW,        "LO_CRYPT_BLOW"         },
  51         { LO_CRYPT_CAST128,     "LO_CRYPT_CAST128"      },
  52         { LO_CRYPT_IDEA,        "LO_CRYPT_IDEA"         },
  53         { LO_CRYPT_DUMMY,       "LO_CRYPT_DUMMY"        },
  54         { LO_CRYPT_SKIPJACK,    "LO_CRYPT_SKIPJACK"     },
  55         { LO_CRYPT_CRYPTOAPI,   "LO_CRYPT_CRYPTOAPI"    },
  56         { 0,                    NULL                    },
  57 };
  58
  59 int loop_ioctl(struct tcb *tcp, long code, long arg)
  60 {
  61         struct loop_info info;
  62         struct loop_info64 info64;
  63         char *s = alloca((LO_NAME_SIZE + LO_KEY_SIZE) * 4);
  64
  65         if (entering(tcp))
  66                 return 0;
  67
  68         switch (code) {
  69
  70         case LOOP_SET_STATUS:
  71         case LOOP_GET_STATUS:
  72                 if (!verbose(tcp) || umove(tcp, arg, &info) < 0)
  73                         return 0;
  74
  75                 tprintf(", {number=%d", info.lo_number);
  76
  77                 if (!abbrev(tcp)) {
  78                         tprintf(", device=%#lx, inode=%lu, rdevice=%#lx",
  79                                 (unsigned long) info.lo_device,
  80                                 info.lo_inode,
  81                                 (unsigned long) info.lo_rdevice);
  82                 }
  83
  84                 tprintf(", offset=%#x", info.lo_offset);
  85
  86                 if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  87                         tprints(", encrypt_type=");
  88                         printxval(loop_crypt_type_options, info.lo_encrypt_type,
  89                                 "LO_CRYPT_???");
  90                         tprintf(", encrypt_key_size=%d", info.lo_encrypt_key_size);
  91                 }
  92
  93                 tprints(", flags=");
  94                 printflags(loop_flags_options, info.lo_flags, "LO_FLAGS_???");
  95
  96                 string_quote(info.lo_name, s, -1, LO_NAME_SIZE);
  97                 tprintf(", name=%s", s);
  98
  99                 if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
 100                         string_quote((void *) info.lo_encrypt_key, s, 0, LO_KEY_SIZE);
 101                         tprintf(", encrypt_key=%s", s);
 102                 }
 103
 104                 if (!abbrev(tcp))
 105                         tprintf(", init={%#lx, %#lx}"
 106                                 ", reserved={%#x, %#x, %#x, %#x}}",
 107                                 info.lo_init[0], info.lo_init[1],
 108                                 info.reserved[0], info.reserved[1],
 109                                 info.reserved[2], info.reserved[3]);
 110                 else
 111                         tprints(", ...}");
 112
 113                 return 1;
 114
 115         case LOOP_SET_STATUS64:
 116         case LOOP_GET_STATUS64:
 117                 if (!verbose(tcp) || umove(tcp, arg, &info64) < 0)
 118                         return 0;
 119
 120                 tprints(", {");
 121
 122                 if (!abbrev(tcp)) {
 123                         tprintf("device=%" PRIu64 ", inode=%" PRIu64 ", "
 124                                 "rdevice=%" PRIu64 ", offset=%#" PRIx64 ", "
 125                                 "sizelimit=%" PRIu64 ", number=%" PRIu32,
 126                                 (uint64_t) info64.lo_device,
 127                                 (uint64_t) info64.lo_inode,
 128                                 (uint64_t) info64.lo_rdevice,
 129                                 (uint64_t) info64.lo_offset,
 130                                 (uint64_t) info64.lo_sizelimit,
 131                                 (uint32_t) info64.lo_number);
 132                 } else {
 133                         tprintf("offset=%#" PRIx64 ", number=%" PRIu32,
 134                                 (uint64_t) info64.lo_offset,
 135                                 (uint32_t) info64.lo_number);
 136                 }
 137
 138                 if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 139                         tprints(", encrypt_type=");
 140                         printxval(loop_crypt_type_options, info64.lo_encrypt_type,
 141                                 "LO_CRYPT_???");
 142                         tprintf(", encrypt_key_size=%" PRIu32,
 143                                 info64.lo_encrypt_key_size);
 144                 }
 145
 146                 tprints(", flags=");
 147                 printflags(loop_flags_options, info64.lo_flags, "LO_FLAGS_???");
 148
 149                 string_quote((void *) info64.lo_file_name, s, -1, LO_NAME_SIZE);
 150                 tprintf(", file_name=%s", s);
 151
 152                 if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 153                         string_quote((void *) info64.lo_crypt_name, s, -1, LO_NAME_SIZE);
 154                         tprintf(", crypt_name=%s", s);
 155                         string_quote((void *) info64.lo_encrypt_key, s, 0, LO_KEY_SIZE);
 156                         tprintf(", encrypt_key=%s", s);
 157                 }
 158
 159                 if (!abbrev(tcp))
 160                         tprintf(", init={%#" PRIx64 ", %#" PRIx64 "}}",
 161                                 (uint64_t) info64.lo_init[0],
 162                                 (uint64_t) info64.lo_init[1]);
 163                 else
 164                         tprints(", ...}");
 165
 166                 return 1;
 167
 168         case LOOP_CLR_FD:
 169 #ifdef LOOP_SET_CAPACITY
 170         case LOOP_SET_CAPACITY:
 171 #endif
 172 #ifdef LOOP_CTL_GET_FREE
 173         /* newer loop-control stuff */
 174         case LOOP_CTL_GET_FREE:
 175 #endif
 176                 /* Takes no arguments */
 177                 return 1;
 178
 179         case LOOP_SET_FD:
 180         case LOOP_CHANGE_FD:
 181 #ifdef LOOP_CTL_ADD
 182         /* newer loop-control stuff */
 183         case LOOP_CTL_ADD:
 184         case LOOP_CTL_REMOVE:
 185 #endif
 186                 /* These take simple args, so let default printer handle it */
 187
 188         default:
 189                 return 0;
 190         }
 191 }